Anti-overshoot circuit of switching power supply

The utility model provides an anti-overshoot circuit of a switching power supply. The anti-overshoot circuit comprises a comparator, a constant voltage ring module and a PWM control chip. Wherein the constant voltage ring module comprises a first operational amplifier; the output end of the comparat...

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Bibliographische Detailangaben
Hauptverfasser: KWON YANG-OK, LUO KANG, LI GANNIAN, ZHANG YUJIN, LI HUAMING
Format: Patent
Sprache:chi ; eng
Schlagworte:
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Beschreibung
Zusammenfassung:The utility model provides an anti-overshoot circuit of a switching power supply. The anti-overshoot circuit comprises a comparator, a constant voltage ring module and a PWM control chip. Wherein the constant voltage ring module comprises a first operational amplifier; the output end of the comparator is connected with the non-inverting input end of the first operational amplifier; the positive phase input end of the comparator is connected with the output end of the PWM control chip; the inverting input end of the comparator is connected with the output end of the first operational amplifier; according to the circuit, output saturation of a first operational amplifier of a constant-voltage ring module is prevented by enabling the output voltage of the first operational amplifier of the constant-voltage ring module to be equal to the output end of a third operational amplifier in a PWM control chip when the constant-current ring module works by using a comparator; therefore, rapid switching between the consta