Circuit rectifying bridge-based voltage protection circuit

Abstract

The invention discloses a circuit rectifying bridge-based voltage protection circuit. The voltage protection circuit comprises an alternating current-direct current conversion circuit, an undervoltage protection circuit and an overvoltage protection circuit, wherein the alternating current-direct current conversion circuit comprises a high-frequency transformer TR1, a bridge type rectifier BR1, an electrolytic capacitor C5, an electrolytic capacitor C6, a capacitor C7, a capacitor C8 and a voltage-stabilizing chip; the two ends of a primary coil of the high-frequency transformer TR1 are connected with a 220V alternating current while one end of a secondary coil of the high-frequency transformer TR1 is connected with a signal input pin of the bridge type rectifier BR1; one end of an output pin of the bridge type rectifier BR1 is connected with an input port VI of the voltage-stabilizing chip; the other end of the output pin of the bridge type rectifier BR1 is connected with a GND end of the voltage-stabilizing chip; the capacitor C7 is connected between the input port VI and the GND of the voltage-stabilizing chip; and the end, connected with the positive electrode end of the electrolytic capacitor C6, of a capacitor C20 is connected with the undervoltage protection circuit and the overvoltage protection circuit. The voltage protection circuit is simplified and can be stored and carried more conveniently; by adopting an amplifier LM324, the cost is lowered; and in addition, external bias components and parts can be reduced, so that the circuit is further simplified.

Description

technical field [0001] The invention relates to a woodworking tool, in particular to a voltage protection circuit based on a circuit rectifier bridge. Background technique [0002] For all electrical equipment, there is a rated voltage, but in practice, it cannot be fully guaranteed to work at the rated voltage, it is a range near the rated voltage, generally required to be within ±15%. In order to protect electrical equipment and process quality, if the voltage is lower than -15%, it is "undervoltage". When the working voltage drops below this voltage, the protection action will cut off the power supply. On the contrary, if the voltage is higher than +15%, it is "overvoltage", and the protection will also act to cut off the power supply. Undervoltage and overvoltage pose great potential safety hazards to electrical appliances and users. As a common household appliance, induction cooker has a voltage protection circuit that is necessary. In the prior art, the voltage prote...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the voltage protection circuit in the induction cooker is more complicated and takes up more space. space, making storage or handling more convenient

Images