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CN-122001211-A - Voltage conversion circuit, chip and electronic equipment

CN122001211ACN 122001211 ACN122001211 ACN 122001211ACN-122001211-A

Abstract

The application provides a voltage conversion circuit, a chip and electronic equipment, which relate to the technical field of power management chips and comprise a switch capacitor voltage conversion circuit and a voltage regulating circuit, wherein the voltage regulating circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first inductor and a second inductor, the switch capacitor voltage conversion circuit comprises a fifth transistor, a sixth transistor, a seventh transistor and an eighth transistor which are connected with each other in a switchable manner through substrates, the voltage conversion circuit works in a three-level voltage stabilizing mode when the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are in an off state to achieve a bus voltage which is more than or equal to 2 times of a battery voltage, and works in a charge pump mode when the first transistor, the second transistor, the third transistor and the fourth transistor are in an off state to achieve a bus voltage which is 4 times of the battery voltage. When the input voltage is more than or equal to 2 times of the output voltage, the conversion is carried out according to any voltage conversion ratio.

Inventors

  • CHEN WEIFU
  • ZHOU XIANG
  • ZHAO WEI

Assignees

  • 珠海楠欣半导体科技有限公司

Dates

Publication Date
20260508
Application Date
20260204

Claims (15)

  1. 1. The voltage conversion circuit comprises a switch capacitor voltage conversion circuit and a voltage regulating circuit, wherein the voltage regulating circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first inductor and a second inductor, and the switch capacitor voltage conversion circuit comprises a fifth transistor, a sixth transistor, a seventh transistor and an eighth transistor which are all transistors with switchable connection substrates; The second end of the first transistor is electrically connected with the first end of the switch capacitor voltage converting circuit and the second end of the fifth transistor, the first end of the first transistor is electrically connected with the second end of the second transistor and the first end of the first inductor respectively, the first end of the second transistor is electrically connected with the third end of the switch capacitor voltage converting circuit and the first end of the sixth transistor respectively, the second end of the third transistor is electrically connected with the fourth end of the switch capacitor voltage converting circuit and the second end of the seventh transistor respectively, the first end of the third transistor is electrically connected with the second end of the fourth transistor and the first end of the second inductor respectively, the first end of the fourth transistor is electrically connected with the sixth end of the switch capacitor voltage converting circuit and the first end of the eighth transistor respectively, the second end of the second transistor is electrically connected with the fourth end of the switch capacitor voltage converting circuit and the fifth end of the second inductor respectively, the second end of the fourth transistor is used for outputting the voltage from the battery; When the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are all in an off state, the voltage conversion circuit operates in a three-level voltage stabilizing mode and is used for converting the bus voltage into the battery voltage, and the bus voltage is more than or equal to 2 times of the battery voltage; When the first transistor, the second transistor, the third transistor and the fourth transistor are all in an off state, the voltage conversion circuit operates in a charge pump mode and is used for converting the bus voltage into the battery voltage, and the bus voltage is 4 times of the battery voltage.
  2. 2. The voltage conversion circuit according to claim 1, wherein the switched-capacitor voltage conversion circuit further comprises a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a seventeenth transistor, an eighteenth transistor, a nineteenth transistor, a twentieth transistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; The second end of the ninth transistor is electrically connected with the second end of the fifteenth transistor respectively and is used as an input end of the switch capacitor voltage conversion circuit and used for being connected with the bus voltage, and the first end of the ninth transistor is electrically connected with the second end of the tenth transistor and the positive plate of the first capacitor respectively; A first terminal of the tenth transistor is electrically connected to a second terminal of the eleventh transistor, a second terminal of the thirteenth transistor, a second terminal of the nineteenth transistor, a first terminal of the sixteenth transistor, and a second terminal of the seventeenth transistor, respectively; The first end of the eleventh transistor is electrically connected with the negative plate of the first capacitor and the second end of the twelfth transistor respectively, the first end of the thirteenth transistor is electrically connected with the first end of the switch capacitor voltage conversion circuit and the positive plate of the second capacitor respectively, and the second end of the fourteenth transistor is electrically connected with the third end of the switch capacitor voltage conversion circuit and the negative plate of the second capacitor respectively; A first end of the fifteenth transistor is electrically connected with the second end of the sixteenth transistor and the positive plate of the third capacitor respectively, and a first end of the seventeenth transistor is electrically connected with the negative plate of the third capacitor and the second end of the eighteenth transistor respectively; A first end of the nineteenth transistor is electrically connected with the positive electrode plate of the fourth capacitor and the fourth end of the switch capacitor voltage conversion circuit respectively, and a second end of the twentieth transistor is electrically connected with the negative electrode plate of the fourth capacitor and the sixth end of the switch capacitor voltage conversion circuit respectively; the first terminal of the twelfth transistor, the first terminal of the fourteenth transistor, the first terminal of the eighteenth transistor, and the first terminal of the twentieth transistor are all grounded.
  3. 3. The voltage conversion circuit according to claim 2, wherein when the voltage conversion circuit is configured to convert the bus voltage into the battery voltage, if a voltage conversion ratio between the bus voltage and the battery voltage is 4:1 or more, the sixth transistor and the eighth transistor are provided as transistors of which substrates are switchably connected; And if the voltage conversion ratio between the bus voltage and the battery voltage is smaller than 4:1 and larger than or equal to 2:1, setting the fifth transistor and the seventh transistor as transistors with switchable connection substrates.
  4. 4. The voltage conversion circuit of claim 2, wherein the voltage regulating circuit further comprises a twenty-first transistor and a twenty-second transistor, and wherein the twenty-first transistor and the twenty-second transistor are substrate-switchably connected transistors; A first end of the twenty-first transistor is electrically connected with a second end of the switched capacitor voltage conversion circuit, and a second end of the twenty-first transistor is electrically connected with an output end of the voltage conversion circuit; the first end of the twenty-second transistor is electrically connected with the fifth end of the switched capacitor voltage conversion circuit, and the second end of the twenty-second transistor is electrically connected with the output end of the voltage conversion circuit.
  5. 5. The voltage conversion circuit according to any one of claims 2 to 4, wherein when the second terminal of the thirteenth transistor is set as an intermediate output terminal of the voltage conversion circuit; The voltage of the intermediate output terminal is 1/2 of the bus voltage by controlling the switching states of the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the fifteenth transistor, the sixteenth transistor, the seventeenth transistor and the eighteenth transistor.
  6. 6. The voltage converting circuit according to any of claims 2-4, wherein a twenty-third transistor is arranged between the input of the switched capacitor voltage converting circuit and the input of the voltage converting circuit, or wherein a twenty-fourth transistor is arranged between the output of the voltage converting circuit and the second end of the first inductor, or wherein the first transistor and the third transistor are arranged as substrate switchably connected transistors; The first end of the thirteenth transistor is electrically connected with the input end of the voltage conversion circuit, and the second end of the thirteenth transistor is electrically connected with the input end of the switched capacitor voltage conversion circuit; The first end of the twenty-fourth transistor is electrically connected with the second end of the first inductor, and the second end of the twenty-fourth transistor is electrically connected with the output end of the voltage conversion circuit.
  7. 7. The voltage conversion circuit according to any one of claims 2 to 4, wherein a twenty-fifth transistor is provided between an output terminal of the voltage conversion circuit and a second terminal of the first inductor, and the second terminal of the first inductor is provided as a system power supply port; a second end of the twenty-fifth transistor is electrically connected with the second end of the first inductor, and a first end of the twenty-fifth transistor is electrically connected with the output end of the voltage conversion circuit.
  8. 8. The voltage conversion circuit according to claim 2, wherein the three-level voltage stabilizing mode is to control the fifth transistor, the sixth transistor, the seventh transistor, and the eighth transistor to be in an off state, and to control the voltage conversion circuit to switch among a first state, a second state, a third state, and a fourth state in order; wherein when a voltage conversion ratio between the bus voltage and the battery voltage is 4:1 or more: in the first state, the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the second transistor, the twentieth transistor, and the third transistor are controlled to be in an on state; controlling the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the first transistor, the nineteenth transistor, and the fourth transistor to be in an off state; In the second state, the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the fourteenth transistor, the second transistor, the twentieth transistor, and the fourth transistor are controlled to be in an on state; controlling the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the thirteenth transistor, the first transistor, the nineteenth transistor, and the third transistor to be in an off state; in the third state, the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the first transistor, the nineteenth transistor, and the fourth transistor are controlled to be in an on state; controlling the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the second transistor, the twentieth transistor, and the third transistor to be in an off state; in the fourth state, the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the second transistor, the twentieth transistor, and the fourth transistor are controlled to be in an on state; controlling the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the first transistor, the nineteenth transistor, and the third transistor to be in an off state; When the voltage conversion ratio between the bus voltage and the battery voltage is less than 4:1: Wherein in the first state, the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the first transistor, the nineteenth transistor, and the third transistor are controlled to be in an on state; controlling the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the second transistor, the twentieth transistor, and the fourth transistor to be in an off state; In the second state, the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the second transistor, the twentieth transistor, and the third transistor are controlled to be in an on state; controlling the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the first transistor, the nineteenth transistor, and the fourth transistor to be in an off state; In the third state, the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the thirteenth transistor, the first transistor, the nineteenth transistor, and the third transistor are controlled to be in an on state; controlling the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the fourteenth transistor, the second transistor, the twentieth transistor, and the fourth transistor to be in an off state; in the fourth state, the tenth transistor, the fifteenth transistor, the twelfth transistor, the seventeenth transistor, the fourteenth transistor, the first transistor, the nineteenth transistor, and the fourth transistor are controlled to be in an on state; controlling the ninth transistor, the sixteenth transistor, the eleventh transistor, the eighteenth transistor, the thirteenth transistor, the second transistor, the twentieth transistor, and the third transistor to be in an off state; The charge pump mode is used for controlling the switch capacitor voltage conversion circuit to switch between a fifth state and a sixth state; In the fifth state, the ninth transistor, the eleventh transistor, the thirteenth transistor, the sixth transistor, the sixteenth transistor, the eighteenth transistor, the seventh transistor and the twentieth transistor are all controlled to be in an on state, and the tenth transistor, the twelfth transistor, the fifth transistor, the fourteenth transistor, the fifteenth transistor, the seventeenth transistor, the nineteenth transistor and the eighth transistor are all controlled to be in an off state; In the sixth state, the tenth transistor, the twelfth transistor, the fifth transistor, the fourteenth transistor, the fifteenth transistor, the seventeenth transistor, the nineteenth transistor, and the eighth transistor are controlled to be in an on state, and the ninth transistor, the eleventh transistor, the thirteenth transistor, the sixth transistor, the sixteenth transistor, the eighteenth transistor, the seventh transistor, and the twentieth transistor are controlled to be in an off state.
  9. 9. The voltage converting circuit according to claim 2, wherein in the case where the switched capacitor voltage converting circuit includes the fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor, both the first terminal of the second transistor and the first terminal of the fourth transistor are grounded; when the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are all in an off state, the voltage conversion circuit operates in a two-level voltage stabilizing mode and is used for converting the bus voltage into the battery voltage, and the bus voltage is more than or equal to 2 times of the battery voltage; When the first transistor, the second transistor, the third transistor and the fourth transistor are all in an off state, the voltage conversion circuit operates in a charge pump mode and is used for converting the bus voltage into the battery voltage, and the bus voltage is 4 times of the battery voltage.
  10. 10. The voltage conversion circuit of claim 9, wherein the second terminal of the first transistor is electrically connected to the second terminal of the thirteenth transistor, and wherein the second terminal of the third transistor is electrically connected to the second terminal of the nineteenth transistor.
  11. 11. The voltage conversion circuit according to any one of claims 9 to 10, wherein when the second terminal of the thirteenth transistor is set as an intermediate output terminal of the voltage conversion circuit; The voltage of the intermediate output terminal is 1/2 of the bus voltage by controlling the switching states of the ninth transistor, the tenth transistor, the eleventh transistor, the twelfth transistor, the fifteenth transistor, the sixteenth transistor, the seventeenth transistor and the eighteenth transistor.
  12. 12. The voltage converting circuit according to any of claims 9-10, wherein a twenty-sixth transistor is provided between an input of the switched capacitor voltage converting circuit and an input of the voltage converting circuit, or wherein a twenty-seventh transistor is provided between an output of the voltage converting circuit and a second end of the first inductor, and wherein the fifth transistor and the seventh transistor are provided as substrate-switchably connected transistors, or wherein the first transistor and the third transistor are provided as substrate-switchably connected transistors, and wherein the fifth transistor and the seventh transistor are provided as substrate-switchably connected transistors; The first end of the twenty-sixth transistor is electrically connected with the input end of the voltage conversion circuit, and the second end of the twenty-sixth transistor is electrically connected with the input end of the switched capacitor voltage conversion circuit; The first end of the twenty-seventh transistor is electrically connected with the second end of the first inductor, and the second end of the twenty-seventh transistor is electrically connected with the output end of the voltage conversion circuit.
  13. 13. The voltage conversion circuit according to any one of claims 9 to 10, wherein a twenty-eighth transistor is provided between an output terminal of the voltage conversion circuit and a second terminal of the first inductor; The second end of the twenty-eighth transistor is electrically connected with the second end of the first inductor, and the first end of the twenty-eighth transistor is electrically connected with the output end of the voltage conversion circuit.
  14. 14. A chip comprising the voltage conversion circuit according to any one of claims 1 to 13.
  15. 15. An electronic device comprising a chip as claimed in claim 14.

Description

Voltage conversion circuit, chip and electronic equipment Technical Field The present application relates to the field of power management chips, and more particularly, to a voltage conversion circuit, a chip, and an electronic device. Background A switched capacitor voltage converter, also commonly referred to as a charge pump, is an efficient converter that uses capacitive devices to store and discharge electrical energy for dc voltage conversion. Based on the state switching of the power tube and the characteristics of the capacitor device for storing electric energy and releasing electric energy, the charge pump can realize the conversion of voltage or current according to the proportion, and the technology is widely applied to the quick charging occasions of mobile equipment such as smart phones, tablet computers, smart watches and the like. The switched capacitor voltage converter generally comprises a plurality of power tubes and a plurality of capacitors, wherein the power tubes are controlled to be in different switching states in different states so as to control the connection relation among the plurality of capacitors, and the switched capacitor voltage converter can realize the proportional conversion between input voltage and output voltage and the proportional conversion between input current and output current based on the characteristics of storing electric energy and releasing electric energy of the capacitors in different states, for example, the output voltage is converted into 1/4 of the input voltage, and the output current is converted into 4 times of the input current. However, when the input voltage is 2 times or more of the output voltage, the conventional switched capacitor voltage converter can only convert the input voltage into the output voltage according to a fixed voltage conversion ratio (for example, 4:1 and 3:1), and cannot convert the input voltage according to any voltage conversion ratio, so that the flexibility of voltage conversion is greatly reduced, and the actual requirements cannot be met. In addition, in the application scenario of charging and discharging, for example, in the application scenario of charging an output voltage by an input voltage, the conventional switched capacitor voltage converter can only realize the charging and discharging functions, and cannot be compatible with the function of supplying power to a system. Disclosure of Invention The application provides a voltage conversion circuit, a chip and electronic equipment, which are used for converting according to any voltage conversion ratio when input voltage is more than or equal to output voltage by 2 times. The application provides a voltage conversion circuit which comprises a switch capacitor voltage conversion circuit and a voltage regulating circuit, wherein the voltage regulating circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first inductor and a second inductor, the switch capacitor voltage conversion circuit comprises a fifth transistor, a sixth transistor, a seventh transistor and an eighth transistor, and the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are transistors with substrate switchably connected; The second end of the first transistor is electrically connected with the first end of the switch capacitor voltage converting circuit and the second end of the fifth transistor, the first end of the first transistor is electrically connected with the second end of the second transistor and the first end of the first inductor respectively, the first end of the second transistor is electrically connected with the third end of the switch capacitor voltage converting circuit and the first end of the sixth transistor respectively, the second end of the third transistor is electrically connected with the fourth end of the switch capacitor voltage converting circuit and the second end of the seventh transistor respectively, the first end of the third transistor is electrically connected with the second end of the fourth transistor and the first end of the second inductor respectively, the first end of the fourth transistor is electrically connected with the sixth end of the switch capacitor voltage converting circuit and the first end of the eighth transistor respectively, the second end of the second transistor is electrically connected with the fourth end of the switch capacitor voltage converting circuit and the fifth end of the second inductor respectively, the second end of the fourth transistor is used for outputting the voltage from the battery; When the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are all in an off state, the voltage conversion circuit operates in a three-level voltage stabilizing mode and is used for converting the bus voltage into the battery voltage, and the bus voltage is more than or equal to 2 times of the battery