CN219394423U

CN219394423U - Low-loss anti-surge circuit

Info

Publication number: CN219394423U
Application number: CN202223576197.2U
Authority: CN
Inventors: 李项伟
Original assignee: Jiangsu Yihe Electronic Co ltd
Current assignee: Jiangsu Yihe Electronic Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-07-21
Anticipated expiration: 2032-12-30

Abstract

The utility model provides a low-loss anti-surge circuit which comprises a thermistor RT1, a rectifier bridge BD1, a relay K1 and a triode Q1, wherein an alternating voltage input end L is connected with a pin 2 of the rectifier bridge BD1, and pins 1 and 4 of the rectifier bridge BD1 are grounded; the thermistor RT1 is connected in series on the N line, one end of the thermistor is connected with the alternating voltage input end N, and the other end of the thermistor is connected with the 3 pins of the rectifier bridge BD 1; and the two ends of the thermistor RT1 are connected with the contact end of the relay K1 in parallel, one end of the relay K1 coil is connected with the power output signal end Vcc, the other end of the relay K1 coil is connected with the collector electrode of the triode Q1, the base electrode of the triode Q1 is connected with the power output signal end Vcc, and the emitter electrode of the triode Q1 is grounded. In the circuit, the thermistor RT1 is connected in series on the N line to realize the suppression effect on surge current at the moment of starting, so that the working temperature of the power supply is reduced, and the working efficiency of the power supply is improved.

Description

Low-loss anti-surge circuit

Technical Field

The utility model relates to the field of power supplies, in particular to a low-loss anti-surge circuit realized for a high-power supply.

Background

The high-power supply generally uses a relatively large electrolytic capacitor as filtering, the electrolytic capacitor is equivalent to short circuit at the moment of starting, at the moment, large surge current is generated in a rectifying and filtering loop of the power supply, large surge impact is generated on a bridge pile of a rectifying device, the bridge pile is damaged once the maximum surge current is exceeded, the power supply is fried, the surge current is generally restrained by adding a thermistor for a low-power supply design, but if the high-power supply is connected in the loop in series through the relatively large thermistor, after the power supply is started normally, large loss is generated due to heating of the thermistor, and the working efficiency of the power supply is influenced.

Therefore, a circuit is needed to solve the problem of surge current of a high-power supply.

Disclosure of Invention

The utility model aims to provide a low-loss anti-surge circuit aiming at the problem of surge current of a high-power supply.

The technical scheme of the utility model is as follows:

the utility model provides a low-loss anti-surge circuit, which comprises a thermistor RT1, a rectifier bridge BD1, a relay K1 and a triode Q1,

the alternating voltage input end L is connected with the 2 pin of the rectifier bridge BD1, and the 1 pin and the 4 pin of the rectifier bridge BD1 are grounded;

the thermistor RT1 is connected in series on the N line, one end of the thermistor is connected with the alternating voltage input end N, and the other end of the thermistor is connected with the 3 pins of the rectifier bridge BD 1; and the two ends of the thermistor RT1 are connected with the contact end of the relay K1 in parallel, one end of the relay K1 coil is connected with the power output signal end Vcc, the other end of the relay K1 coil is connected with the collector electrode of the triode Q1, the base electrode of the triode Q1 is connected with the power output signal end Vcc, and the emitter electrode of the triode Q1 is grounded.

Further, the 1 pin of the rectifying bridge BD1 is connected in series to the filter capacitor EC1 and then grounded.

The utility model has the beneficial effects that:

according to the utility model, the relays are connected in parallel at the two ends of the thermistor, so that the thermistor plays a role in inhibiting surge at the moment of starting the power supply, once the starting of the power supply is completed, the relay is controlled by the control signal to short-circuit the thermistor, and current passes through the relay instead of the thermistor, so that the thermistor does not cause loss when the power supply works normally, and the working efficiency of the power supply is improved.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.

Fig. 1 shows a circuit diagram of the present utility model.

Detailed Description

Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.

As shown in fig. 1, the present utility model provides a low-loss anti-surge circuit including a thermistor RT1, a rectifier bridge BD1, a relay K1, a filter capacitor EC1 and a transistor Q1,

the alternating voltage input end L is connected with the 2 pins of the rectifier bridge BD1, the 1 pin of the rectifier bridge BD1 is connected with the filter capacitor EC1 in series and then grounded, and the 4 pin of the rectifier bridge BD1 is grounded;

Working principle:

the thermistor RT1 is connected in series with the N line to realize the suppression effect of the surge current at the starting moment, the relay K1 is connected in parallel at the two ends of the thermistor, when the LN is electrified, no output is caused by the fact that the power supply is not normally started, so that Vcc has no signal, the relay is not closed, at the moment, the surge current is suppressed through the thermistor RT1, when the Vcc signal is established after the power supply is normally started, the relay K1 is controlled to be closed to short-circuit the thermistor RT1, the purpose that the RT1 does not pass through the current and has no loss is achieved, the working temperature of the power supply is reduced, and the working efficiency of the power supply is improved.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims

1. A low-loss anti-surge circuit is characterized by comprising a thermistor RT1, a rectifier bridge BD1, a relay K1 and a triode Q1,

the alternating voltage input end L of the circuit is connected with the 2 pin of the rectifier bridge BD1, and the 1 pin and the 4 pin of the rectifier bridge BD1 are grounded;

2. The low-loss anti-surge circuit according to claim 1, wherein the 1 pin of the rectifier bridge BD1 is connected in series with the filter capacitor EC1 and then grounded.