High-voltage power-on circuit and high-voltage power-on circuit control method
Through the startup voltage generation circuit, switch mode power supply circuit, bandgap reference voltage source and unidirectional conduction circuit in the high-voltage power-up circuit, a stable power supply is generated, which solves the problem of power supply fluctuation affecting circuit performance during the power-up process of the high-voltage chip, and realizes power supply suppression and power consumption optimization.
Patent Information
- Application Number
- CN202510721943.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-09-16
AI Technical Summary
During the power-on process of high-voltage chips, the voltage after step-down processing is inaccurate and affected by temperature, resulting in power supply fluctuations that affect circuit performance.
A high-voltage power-on circuit is used, including a startup voltage generation circuit, a switch-mode power supply circuit, a bandgap reference voltage source, a low-dropout linear regulator, and a unidirectional conduction circuit. The startup voltage is generated by stepping down the voltage, and the output voltage of the low-dropout linear regulator is fed back to the switch-mode power supply circuit and the bandgap reference voltage source to provide a stable power supply.
The power supply suppression capability is improved, the influence of the voltage after the step-down process on the circuit performance is avoided, and the circuit power consumption is reduced.
Smart Images
Figure CN120658055A_ABST
Abstract
Claims
1. A high voltage power-up circuit, characterized in that: The high-voltage power-up circuit comprises: a starting voltage generating circuit, wherein a first input terminal of the starting voltage generating circuit is connected to a power supply voltage; a switch mode power supply circuit, wherein a first input terminal of the switch mode power supply circuit is connected to the power supply voltage, and a second input terminal of the switch mode power supply circuit is connected to the output terminal of the startup voltage generating circuit; a bandgap reference voltage source, wherein an input end of the bandgap reference voltage source is connected to an output end of the startup voltage generating circuit; a low-dropout linear regulator, wherein a first input terminal of the low-dropout linear regulator is connected to a first output terminal of the bandgap reference voltage source, and a second input terminal of the low-dropout linear regulator is connected to an output terminal of the switch-mode power supply circuit; A unidirectional conducting circuit, wherein the positive terminal of the unidirectional conducting circuit is connected to the output terminal of the low voltage drop linear regulator, and the negative terminal of the unidirectional conducting circuit is connected to the output terminal of the starting voltage generating circuit.
2. The high voltage power-up circuit according to claim 1, wherein: The high-voltage power-up circuit further includes: A comparator, wherein the non-inverting input terminal of the comparator is connected to the output terminal of the switch mode power supply circuit, the inverting input terminal of the comparator is connected to the second output terminal of the bandgap reference voltage source, and the output terminal of the comparator is connected to the second input terminal of the startup voltage generating circuit.
3. The high voltage power-up circuit according to claim 2, wherein: The high-voltage power-up circuit further includes: Instruction receiving module; A main control module, wherein a first input end of the main control module is connected to an output end of the instruction receiving module, a second input end of the main control module is connected to an output end of the switch mode power supply circuit, and an output end of the main control module is connected to a non-inverting input end of the comparator.
4. The high voltage power-up circuit according to claim 2, wherein: The starting voltage generating circuit includes: a first resistor, wherein a first end of the first resistor is connected to the power supply voltage; a first MOS transistor, wherein a source of the first MOS transistor is connected to the power supply voltage, and a drain of the first MOS transistor is connected to the second end of the first resistor; a second MOS transistor, wherein a source of the second MOS transistor is connected to the power supply voltage, and a gate of the second MOS transistor is connected to the gate of the first MOS transistor; a third MOS transistor, wherein a drain of the third MOS transistor is connected to the drain of the second MOS transistor, and a gate of the third MOS transistor is connected to the second end of the first resistor; a fourth MOS transistor, wherein the drain of the fourth MOS transistor is connected to the source of the third MOS transistor, the source of the fourth MOS transistor is connected to the gate of the fourth MOS transistor, and the source of the fourth MOS transistor is connected to the input end of the bandgap reference voltage source and the input end of the switch mode power supply circuit; a fifth MOS transistor, wherein a source of the fifth MOS transistor is connected to the source of the third MOS transistor, a gate of the fifth MOS transistor is connected to the output end of the comparator, and a drain of the fifth MOS transistor is connected to the source of the fourth MOS transistor; a first capacitor, wherein a first end of the first capacitor is connected to the source of the fourth MOS transistor, and a second end of the first capacitor is connected to a negative reference voltage; a second capacitor, wherein a first end of the second capacitor is connected to the source of the third MOS transistor, and a second end of the second capacitor is connected to the negative reference voltage; a third capacitor, wherein a first end of the third capacitor is connected to the second end of the first resistor, and a second end of the third capacitor is connected to a negative reference voltage; A Zener diode, wherein a cathode of the Zener diode is connected to the first end of the third capacitor, and an anode of the Zener diode is connected to the negative reference voltage.
5. The high voltage power-up circuit according to claim 2, wherein: The starting voltage generating circuit includes: a second resistor, a first end of the second resistor being connected to the power supply voltage; a sixth MOS transistor, wherein the drain and the gate of the sixth MOS transistor are connected to the second end of the second resistor; a seventh MOS transistor, wherein a source of the seventh MOS transistor is connected to the source of the sixth MOS transistor, and a drain of the seventh MOS transistor is connected to the gate of the seventh MOS transistor; an eighth MOS transistor, wherein the drain of the eighth MOS transistor is connected to the drain of the seventh MOS transistor, and the gate of the eighth MOS transistor is connected to the gate of the seventh MOS transistor; a ninth MOS transistor, wherein the gate of the ninth MOS transistor is connected to the gate of the eighth MOS transistor, the drain of the ninth MOS transistor is connected to the source of the sixth MOS transistor, and the source of the ninth MOS transistor is connected to the source of the eighth MOS transistor; a tenth MOS transistor, wherein the gate of the tenth MOS transistor is connected to the drain of the sixth MOS transistor, the drain of the tenth MOS transistor is connected to the power supply voltage, and the source of the tenth MOS transistor is connected to the input end of the bandgap reference voltage source and the second input end of the switch mode power supply circuit; a triode, wherein the emitter of the triode is connected to the source of the eighth MOS transistor, and the collector of the triode is connected to a negative reference voltage; an inverter, wherein an input end of the inverter is connected to an output end of the comparator, and an output end of the inverter is connected to a base of the transistor; a fourth capacitor, wherein a first end of the fourth capacitor is connected to the second end of the second resistor, and a second end of the fourth capacitor is connected to the negative reference voltage; a first diode, wherein a cathode of the first diode is connected to the second end of the second resistor, and an anode of the first diode is connected to the negative reference voltage; a fifth capacitor, wherein a first end of the fifth capacitor is connected to the source of the tenth MOS transistor, and a second end of the fifth capacitor is connected to the negative reference voltage; A second diode, wherein a cathode of the second diode is connected to the first end of the fifth capacitor, and an anode of the second diode is connected to the negative reference voltage.
6. The high voltage power-up circuit according to claim 1, wherein: The unidirectional conducting circuit comprises: an eleventh MOS transistor, wherein the source of the eleventh MOS transistor is connected to the output end of the low voltage difference linear regulator, and the drain of the eleventh MOS transistor is connected to the output end of the startup voltage generating circuit; a twelfth MOS transistor, wherein the source of the twelfth MOS transistor is connected to the source of the eleventh MOS transistor, and the gate of the twelfth MOS transistor is connected to the drain of the twelfth MOS transistor; a thirteenth MOS transistor, wherein the source of the thirteenth MOS transistor is connected to the drain of the eleventh MOS transistor, the gate of the thirteenth MOS transistor is connected to the gate of the twelfth MOS transistor, and the drain of the thirteenth MOS transistor is connected to the gate of the eleventh MOS transistor; a fourteenth MOS transistor, wherein the drain of the fourteenth MOS transistor is connected to the drain of the twelfth MOS transistor, and the source of the fourteenth MOS transistor is connected to a negative reference voltage; a fifteenth MOS transistor, wherein the drain of the fifteenth MOS transistor is connected to the drain of the thirteenth MOS transistor, the source of the fifteenth MOS transistor is connected to the negative reference voltage, and the gate of the fifteenth MOS transistor is connected to the gate of the fourteenth MOS transistor; a sixteenth MOS transistor, wherein the gate of the sixteenth MOS transistor is connected to the gate of the fifteenth MOS transistor, the drain of the sixteenth MOS transistor is connected to the gate of the sixteenth MOS transistor and a preset bias current source, and the source of the sixteenth MOS transistor is connected to the negative reference voltage.
7. The high voltage power-up circuit according to claim 1, wherein: The unidirectional conducting circuit comprises: A Schottky diode, wherein the anode of the Schottky diode is connected to the output end of the low voltage difference linear regulator, and the cathode of the Schottky diode is connected to the output end of the starting voltage generating circuit.
8. A high voltage power-on circuit control method, characterized in that: The high-voltage power-on circuit control method is applied to the high-voltage power-on circuit according to any one of claims 1 to 7; The high-voltage power-on circuit control method includes: The power supply voltage is stepped down by a starting voltage generating circuit to obtain a starting voltage; generating an intermediate voltage based on the power supply voltage and the startup voltage by a switch mode power supply circuit to improve power supply rejection; generating a reference voltage based on the startup voltage by a bandgap reference voltage source; generating a DC voltage based on the intermediate voltage and the reference voltage by a low-dropout linear regulator; The DC voltage is transmitted to the switch mode power supply circuit and the bandgap reference voltage source through a unidirectional conduction circuit, so as to power the switch mode power supply circuit and the bandgap reference voltage source based on the DC voltage.