CN-224233351-U - Chip power supply circuit and electronic circuit

CN224233351UCN 224233351 UCN224233351 UCN 224233351UCN-224233351-U

Abstract

The application relates to a chip power supply circuit and an electronic circuit. The chip power supply circuit judges whether the power supply voltage of the battery is smaller than the preset working voltage of the chip through the power supply path switching circuit, the power supply circuit is switched to the direct communication path when the power supply voltage of the battery is smaller than the preset working voltage of the chip, the battery supplies power to the chip through the switch module, the phenomenon that the power supply voltage cannot meet the preset working voltage of the chip due to the fact that partial voltage drop is lost when the power supply voltage is larger than or equal to the preset working voltage of the chip is avoided, the power supply circuit is switched to the voltage-reducing path when the power supply voltage of the battery is larger than or equal to the preset working voltage of the chip, the battery supplies power to the chip through the voltage-dividing unit, partial voltage drop is consumed by the power supply voltage through the voltage-dividing unit, the voltage supplied to the chip is reduced, and the chip is prevented from being damaged due to the fact that the power supply voltage of the chip exceeds the maximum preset working voltage of the chip is avoided.

Inventors

WU ZHONGYU
WANG TAO
WANG CHENG
CHENG SHENGQUN
MA JIAN

Assignees

立讯精密科技(南京)有限公司

Dates

Publication Date: 20260512
Application Date: 20250429

Claims (10)

1. A chip power supply circuit, the chip power supply circuit comprising: A battery for providing a supply voltage; The input end of the power supply path switching circuit is connected with the battery, the output end of the power supply path switching circuit is connected with the direct communication path, the power supply path is switched to the direct communication path when the power supply voltage is smaller than a preset working voltage, and the power supply path is switched to the step-down path when the power supply voltage is larger than or equal to the preset working voltage; The direct communication path comprises a switch module which is respectively connected with the power supply path switching circuit, the battery and the chip to be powered, wherein the switch module is used for switching the power supply path into the direct communication path or the voltage reduction path; The voltage reduction channel comprises a voltage division unit, wherein the preset working voltage is the sum of the minimum working voltage of the chip and the voltage reduction of the voltage division unit, and the voltage division unit is connected with the battery and the chip to be powered.
2. The chip power supply circuit according to claim 1, wherein the voltage dividing unit is a voltage dividing diode, the positive electrode of the voltage dividing diode is connected with the battery, and the negative electrode of the voltage dividing diode is connected with the chip; The switch module is in an off state when receiving an off signal output by the power supply path switching circuit so as to switch a power supply path to the voltage reduction path, and the power supply voltage is provided to the chip after passing through the voltage division diode; the switch module is in a conducting state when receiving a conducting signal output by the power supply channel switching circuit so as to switch the power supply channel to the direct communication channel, and the power supply voltage is provided to the chip after passing through the switch module.
3. The chip power supply circuit according to claim 2, wherein the power supply path switching circuit comprises a voltage acquisition circuit, a voltage stabilizer and a voltage comparator, wherein an input end of the voltage acquisition circuit is connected with the battery, an output end of the voltage acquisition circuit is connected with a positive input end of the voltage comparator, an input end of the voltage stabilizer is connected with the battery, an output end of the voltage stabilizer is connected with a negative input end of the voltage comparator, an output end of the voltage comparator is connected with the switch module, the voltage acquisition circuit provides a detection voltage for the voltage comparator, and the voltage stabilizer provides a reference voltage for the voltage comparator; The voltage comparator is used for outputting a turn-off signal when the detection voltage is greater than or equal to the reference voltage, and outputting a turn-on signal when the detection voltage is less than the reference voltage.
4. The chip power supply circuit according to claim 3, wherein the detection voltage collected by the voltage collection circuit is a power supply voltage of the battery, and the reference voltage provided by the voltage stabilizer for the voltage comparator is a preset operating voltage of the chip.
5. The chip power supply circuit according to claim 3, wherein the detection voltage acquired by the voltage acquisition circuit is one half of the power supply voltage, and the reference voltage provided by the voltage regulator for the voltage comparator is one half of the corresponding preset working voltage of the chip.
6. The chip power supply circuit according to claim 5, wherein the voltage acquisition circuit comprises a first resistor and a second resistor with the same resistance, a first end of the first resistor is connected with the battery, a second end of the first resistor is connected with a first end of the second resistor and a positive electrode input end of the voltage comparator respectively, and a second end of the second resistor is grounded.
7. The chip power supply circuit of claim 1, wherein the switching module comprises a field effect transistor.
8. A chip power supply circuit according to claim 3, wherein the input and output terminals of the voltage regulator are each connected to a filter capacitor.
9. A chip power supply circuit according to claim 3, wherein a current limiting resistor is connected between the first terminal and the third terminal of the switching module, the first terminal of the switching module is connected to the positive electrode of the voltage dividing diode, and the third terminal of the switching module is connected to the output terminal of the voltage comparator.
10. An electronic circuit comprising an electrically connected chip and a chip power supply circuit according to any one of claims 1-9.

Description

Chip power supply circuit and electronic circuit Technical Field The present disclosure relates to electronic circuits, and particularly to a chip power supply circuit and an electronic circuit. Background Most of the existing chips are powered by batteries, but the maximum power supply voltage of the batteries often exceeds the maximum preset working voltage of the chips, so that the risk of over-voltage damage is brought to the chips, in order to avoid the overlarge power supply voltage to the chips, a Schottky diode is connected between the chips and the batteries in series in the prior art, so that the power supply voltage of the batteries is reduced, but when the power supply voltage of the batteries is lower, the voltage drop of the Schottky diode is combined, so that the power supply voltage provided to the chips is smaller than the minimum working voltage of the chips, and the chips cannot work normally. Disclosure of utility model The application provides a chip power supply circuit which is used for solving the problem that the chip is negatively influenced when the power supply voltage of a battery fluctuates. In a first aspect, the present application provides a chip power supply circuit comprising: A battery for providing a supply voltage; The input end of the power supply path switching circuit is connected with the battery, the output end of the power supply path switching circuit is connected with the direct communication path, the power supply path is switched to the direct communication path when the power supply voltage is smaller than the preset working voltage, and the power supply path is switched to the step-down path when the power supply voltage is larger than or equal to the preset working voltage; The direct communication path comprises a switch module which is respectively connected with the power supply path switching circuit, the battery and the chip to be powered, wherein the switch module is used for switching the power supply path into the direct communication path or the voltage reduction path; The voltage reduction channel comprises a voltage division unit, wherein the preset working voltage is the sum of the minimum working voltage of the chip and the voltage reduction of the voltage division unit, and the voltage division unit is connected with the battery and the chip to be powered. Optionally, the voltage dividing unit is a voltage dividing diode, the positive electrode of the voltage dividing diode is connected with the battery, and the negative electrode of the voltage dividing diode is connected with the chip; The switch module is in an off state when receiving an off signal output by the power supply path switching circuit so as to switch a power supply path to the voltage reduction path, and the power supply voltage is provided to the chip after passing through the voltage division diode; the switch module is in a conducting state when receiving a conducting signal output by the power supply channel switching circuit so as to switch the power supply channel to the direct communication channel, and the power supply voltage is provided to the chip after passing through the switch module. Optionally, the power supply path switching circuit includes a voltage acquisition circuit, a voltage stabilizer and a voltage comparator, wherein an input end of the voltage acquisition circuit is connected with the battery, an output end of the voltage acquisition circuit is connected with an anode input end of the voltage comparator, an input end of the voltage stabilizer is connected with the battery, an output end of the voltage stabilizer is connected with a cathode input end of the voltage comparator, an output end of the voltage comparator is connected with the switch module, the voltage acquisition circuit provides detection voltage for the voltage comparator, and the voltage stabilizer provides reference voltage for the voltage comparator; The voltage comparator is used for outputting a turn-off signal when the detection voltage is greater than or equal to the reference voltage, and outputting a turn-on signal when the detection voltage is less than the reference voltage. Optionally, the detected voltage collected by the voltage collecting circuit is a supply voltage of the battery, and the reference voltage provided by the voltage stabilizer for the voltage comparator is a preset working voltage of the chip. Optionally, the detection voltage acquired by the voltage acquisition circuit is one half of the supply voltage, and the reference voltage provided by the voltage stabilizer for the voltage comparator is one half of the corresponding preset working voltage of the chip. Optionally, the voltage acquisition circuit includes first resistance and second resistance that the resistance is the same, the first end of first resistance with the battery links to each other, the second end of first resistance respectively with the first end of second resistance the anodal input of