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CN-122026704-A - Voltage conversion circuit, power supply circuit and electronic equipment

CN122026704ACN 122026704 ACN122026704 ACN 122026704ACN-122026704-A

Abstract

The application discloses a voltage conversion circuit, a power supply circuit and an electronic device, the voltage conversion circuit includes an input for receiving a first voltage, an output for outputting a second voltage, and an inductance. The working mode of the voltage conversion circuit comprises a step-up mode and a step-down mode, the voltage conversion circuit periodically and alternately works in the first stage and the second stage when in the step-up mode or the step-down mode so that the output end outputs second voltage to a load, the voltage conversion circuit forms a magnetizing loop to magnetize inductance when working in the first stage, the voltage conversion circuit forms a demagnetizing loop to demagnetize inductance when working in the second stage, and the voltage conversion circuit works in the step-up mode when the duty ratio is larger than a preset duty ratio threshold value and works in the step-down mode when the duty ratio is smaller than the preset duty ratio threshold value. When the voltage conversion circuit is used for switching the working mode, the topological structure of the circuit is not required to be changed, and the problem that the output voltage is subjected to voltage overshoot or voltage undershoot can be avoided.

Inventors

  • Wang Zeang

Assignees

  • 荣耀终端股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A voltage conversion circuit, comprising: the input end is used for being electrically connected with the power supply module and receiving the first voltage output by the power supply module; the output end is used for being electrically connected with a load so as to output a second voltage to the load; An inductance; The voltage conversion circuit is in a first stage and a second stage in a periodic alternating mode when in the voltage boosting mode or the voltage reducing mode, so that the output end outputs the second voltage to the load; when the voltage conversion circuit works in the first stage, a magnetizing circuit is formed in the voltage conversion circuit, the magnetizing circuit magnetizes the inductor, and when the voltage conversion circuit works in the second stage, a demagnetizing circuit is formed in the voltage conversion circuit, the demagnetizing circuit demagnetizes the inductor, wherein the inductor is simultaneously positioned in the magnetizing circuit and the demagnetizing circuit; The duty ratio D of the voltage conversion circuit is the ratio of the duration of the voltage conversion circuit in a first stage to the total duration of one period, when the duty ratio D is larger than a preset duty ratio threshold value, the voltage conversion circuit works in the boosting mode, the second voltage output by the output end is higher than the first voltage output by the power supply module, and when the duty ratio D is smaller than the preset duty ratio threshold value, the voltage conversion circuit works in the step-down mode, and the second voltage output by the output end is lower than the first voltage output by the power supply module.
  2. 2. The voltage conversion circuit of claim 1, further comprising a switch module, m magnetizing capacitors, and n demagnetizing capacitors, wherein when the voltage conversion circuit is operated in the first stage, the switch module is in a magnetizing switch combination state, at least the m magnetizing capacitors and the inductor are sequentially connected in series between the input end and the output end to form the magnetizing circuit, and magnetize the inductor, and when the voltage conversion circuit is operated in the second stage, the switch module is in a demagnetizing switch combination state, at least the inductor and the n demagnetizing capacitors are sequentially connected in series between the input end and the output end to form the demagnetizing circuit, and m and n are integers greater than or equal to 1.
  3. 3. The voltage conversion circuit according to claim 2, wherein the switch module further electrically connects the n demagnetizing capacitances between the output terminal and the ground when in the combination state of the magnetizing switches, and wherein the switch module further electrically connects the m demagnetizing capacitances between the input terminal and the ground when in the combination state of the demagnetizing switches.
  4. 4. The voltage conversion circuit of claim 3, wherein m = 2, n = 1, the m magnetizing capacitors comprising a first magnetizing capacitor and a second magnetizing capacitor, the n demagnetizing capacitors comprising one demagnetizing capacitor, wherein a first end of the inductor is electrically connected to a first end of the second magnetizing capacitor, and a second end of the inductor is electrically connected to the first end of the demagnetizing capacitor; the switch module includes: A first switch electrically connected between the input terminal and a second terminal of the first magnetizing capacitor; a second switch electrically connected between the first end of the first magnetizing capacitor and the second end of the second magnetizing capacitor; A third switch electrically connected between the second end of the inductor and the output end; the fourth switch is electrically connected between the second end of the demagnetizing capacitor and the ground; A fifth switch electrically connected between the input terminal and the first terminal of the inductor; a sixth switch electrically connected between the second end of the demagnetizing capacitor and the output end; A seventh switch electrically connected between the first end of the inductor and the first end of the first magnetizing capacitor; an eighth switch electrically connected between the second end of the first magnetizing capacitor and ground; a ninth switch electrically connected between the second end of the second magnetizing capacitor and ground; When the switch module is in the magnetizing switch combination state, the first switch, the second switch, the third switch and the fourth switch are all turned on, the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch are all turned off, and when the switch module is in the demagnetizing switch combination state, the first switch, the second switch, the third switch and the fourth switch are all turned off, and the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch are all turned on.
  5. 5. The voltage conversion circuit according to claim 4, wherein a ratio of the second voltage output from the output terminal to the first voltage is (2d+1)/(2-D).
  6. 6. The voltage conversion circuit according to claim 4, wherein a ratio of an average value of the current flowing through the inductor to an average value of the current received by the input terminal is 1/(1+0.5d).
  7. 7. The voltage conversion circuit according to claim 4, wherein a ratio of an average value of the current flowing through the inductor to an average value of the current output from the output terminal to the load is 1/(2-D).
  8. 8. The voltage conversion circuit according to any one of claims 1 to 7, further comprising a voltage stabilizing capacitor electrically connected between the output terminal and ground, the voltage stabilizing capacitor being configured to stabilize the second voltage output from the output terminal.
  9. 9. A power supply circuit, comprising: The voltage conversion circuit according to any one of claims 1 to 8; the power module is electrically connected with the voltage conversion circuit and used for outputting a first voltage to the voltage conversion circuit.
  10. 10. An electronic device, comprising: The voltage conversion circuit according to any one of claims 1 to 8; the voltage conversion circuit is used for outputting a second voltage to the load.

Description

Voltage conversion circuit, power supply circuit and electronic equipment Technical Field The present application relates to the field of voltage conversion circuits, and more particularly to a voltage conversion circuit, a power supply circuit, and an electronic device. Background To facilitate the use of electronic devices, batteries are often provided in the electronic devices to power loads in the electronic devices. The discharge voltage of the conventional battery in the electronic device is approximately between 2.7V and 4.2V, and along with the development of the silicon negative electrode battery, the discharge voltage of the conventional battery can be as low as 1.5V or even lower, however, the voltage requirements of various loads in the electronic device are generally concentrated between 3.3V and 3.4V, so that a voltage conversion circuit is required to convert the voltage output by the battery to output the voltage to the loads. The conventional voltage conversion circuit generally comprises two different circuits, namely a voltage boosting circuit and a voltage reducing circuit, and in the process of charging and discharging a battery, the conventional voltage conversion circuit needs to correspondingly start the voltage boosting circuit or the voltage reducing circuit according to the current requirement of voltage boosting or voltage reducing, and then works through the current started voltage boosting circuit or the current started voltage reducing circuit to realize voltage boosting or voltage reducing. However, since the step-up circuit and the step-down circuit are two different circuits, the topology structure in the voltage conversion circuit can be changed in the process of switching and enabling the step-up circuit and the step-down circuit, so that the output voltage of the voltage conversion circuit can be disturbed to generate the problem of voltage overshoot or voltage undershoot, and the problem of voltage overshoot or voltage undershoot can damage components and affect the normal operation of electronic equipment. Disclosure of Invention The application provides a voltage conversion circuit, a power supply circuit and electronic equipment, which can solve the problem that the traditional voltage conversion circuit has voltage overshoot or voltage undershoot when switching working states. In a first aspect, the present application provides a voltage conversion circuit comprising: the input end is used for being electrically connected with the power supply module and receiving the first voltage output by the power supply module; the output end is used for being electrically connected with a load so as to output a second voltage to the load; An inductance; The voltage conversion circuit is in a first stage and a second stage in a periodic alternating mode when in the voltage boosting mode or the voltage reducing mode, so that the output end outputs the second voltage to the load; when the voltage conversion circuit works in the first stage, a magnetizing circuit is formed in the voltage conversion circuit, the magnetizing circuit magnetizes the inductor, and when the voltage conversion circuit works in the second stage, a demagnetizing circuit is formed in the voltage conversion circuit, the demagnetizing circuit demagnetizes the inductor, wherein the inductor is simultaneously positioned in the magnetizing circuit and the demagnetizing circuit; The duty ratio D of the voltage conversion circuit is the ratio of the duration of the voltage conversion circuit in a first stage to the total duration of one period, when the duty ratio D is larger than a preset duty ratio threshold value, the voltage conversion circuit works in the boosting mode, the second voltage output by the output end is higher than the first voltage output by the power supply module, and when the duty ratio D is smaller than the preset duty ratio threshold value, the voltage conversion circuit works in the step-down mode, and the second voltage output by the output end is lower than the first voltage output by the power supply module. The voltage conversion circuit provided by the application is periodically and alternately operated in the first stage and the second stage in the boost mode and the buck mode, the same magnetizing loop is used for magnetizing the inductor in the first stage of the boost mode and the same demagnetizing loop is used for demagnetizing the inductor in the second stage of the boost mode and the buck mode, so that the switching between the boost mode and the buck mode can be realized by adjusting the duration ratio of the first stage in one period. In combination with the first aspect, in some embodiments, the voltage conversion circuit further includes a switch module, m magnetizing capacitors, and n demagnetizing capacitors, when the voltage conversion circuit works in the first stage, the switch module is in a magnetizing switch combination state, at least the m magnetizing capacitors