CN201918774U - Self-cooling type dual-loop control charger - Google Patents

Abstract

The utility model discloses a self-cooling type dual-loop control charger. A main charging circuit of the charger comprises a bridge type rectifier circuit, two smoothing filter circuits and a DC/DC (direct current/direct current) converter circuit, the main charging circuit of the charger is provided with a resonant voltage type dual-loop control circuit, which is connected with a feedback sampling circuit, a current-sharing control circuit and an overcurrent, overvoltage and short circuit protection circuit, and the main charging circuit of the charger is also provided with an input protection circuit and an output protection circuit. Since the main charging circuit of the charger is added with the resonant voltage type dual-loop control circuit, once overcurrent, overvoltage or short circuit occurs in the process of charging carried out by the charger, the internal protection circuit can carry out handling in time, consequently, the charger can be safer and more stable in the process of charging, and meanwhile, the service life of the charger is prolonged as well.

Description

A self-cooling double-loop control charger

technical field

The utility model relates to a charger, in particular to a self-cooling double-loop control charger.

Background technique

At present, charging is widely used in a wide range of applications. With the development of battery-type electric tools, the matching chargers are constantly improving and developing in terms of charging speed, performance and reliability. There are many types of fast chargers commonly used in existing battery-type electric tools, but existing charging products such as chargers are usually hard switches (less than 80% in efficiency) and relatively large in size, usually air-cooled for heat dissipation. And there is no over-current, over-voltage and short-circuit protection circuit. Once an over-current, over-voltage or short-circuit occurs in the circuit, it will directly lead to the scrapping of the entire product and bring economic losses to the user.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model provides a relatively small volume switch with overcurrent, overvoltage and short circuit protection circuit, better safety performance, longer service life and soft switch (higher than 92% efficiency). Self-cooling dual-loop control charger.

In order to achieve the above purpose, the utility model provides a self-cooling double-loop control charger, which consists of a bridge rectifier circuit, a smoothing filter circuit, a DC/DC conversion circuit, and a smoothing filter circuit to form a charger charging main circuit. The main charging circuit of the charger is provided with a resonant voltage double-loop control loop, and the resonant voltage double-loop control loop is connected with a feedback sampling circuit, a current sharing control circuit, and an overcurrent and overvoltage short circuit protection circuit.

The utility model can be further configured such that the feedback sampling circuit is connected in series with the current equalizing control circuit, and the overcurrent, overvoltage and short circuit protection circuit is connected in parallel with the feedback sampling circuit.

The utility model can further be configured such that the main charging circuit of the charger is further provided with an input protection circuit and an output protection circuit.

The beneficial effects of the utility model are: since a resonant voltage type double-loop control loop is added to the charging main circuit of the charger, and the resonant voltage type double-loop control loop is connected with a feedback sampling circuit, a current equalization control circuit, an overcurrent and overvoltage Short-circuit protection circuit, so once the charger has over-current, over-voltage or short-circuit during the charging process, it can be dealt with in time through the internal protection circuit, making the charger safer and more stable during the charging process, and soft switching High efficiency and low heat generation also prolong the service life of the charger.

The utility model can further be configured that a self-cooling radiator is provided on the casing of the charger body.

With the above-mentioned structure, the charger body provided by the utility model can be cooled and dissipated by the self-cooling radiator, which avoids the occurrence of damage to the charger directly caused by the failure of the cooling fan of the conventional charger, and further prolongs the life of the charger. service life.

Description of drawings

Fig. 1 is the principle structural block diagram of the present utility model;

Fig. 2 is a top view of the charger body of the present invention.

Detailed ways

As shown in Figure 1, a self-cooling double-loop control charger is provided, and the charger charging main circuit 1 is composed of a bridge rectifier circuit 11, a smoothing filter circuit 12, a DC/DC conversion circuit 13, and a smoothing filter circuit 12. The main charging circuit 1 of the charger is provided with a resonant voltage type double-loop control loop 14, and the described resonant voltage type double-loop control loop 14 is connected with a feedback sampling circuit 15, a current sharing control circuit 16, and an overcurrent and overvoltage short circuit protection circuit. circuit 17, the charger charging main circuit 1 is also provided with an input protection circuit 18 and an output protection circuit 19, the feedback sampling circuit 15 is connected in series with the current sharing control circuit 16, and the overcurrent and overvoltage short circuit protection The circuit 17 is connected in parallel with the feedback sampling circuit 15 .

The output overvoltage protection circuit described therein: is a built-in overvoltage protection circuit. After overvoltage occurs, the module will automatically lock, the module fault indicator light will be on, and the faulty module will automatically quit working, which will not affect the normal operation of the entire system; overvoltage protection point: 220V The module is 285V±5V.

Output current limiting protection circuit: the maximum output current of each module is limited to 1.05 times of the rated output current.

Short-circuit protection circuit: The retraction drooping current limiting method is adopted. When the output is short-circuited, the module instantly pulls down the output voltage to zero, and the short-circuit current is limited below 15% of the rated output current. The module can work in a short-circuit state for a long time without damage, and the module can automatically resume work after troubleshooting.

As shown in FIG. 2 , the casing 21 of the charger body 2 is provided with a self-cooling radiator 22 .

Claims (5)

1. self cool dicyclo control type charger; constitute charger charging main circuit by bridge rectifier, smoothed filter circuit, DC/DC translation circuit, smoothed filter circuit; it is characterized in that: described charger charging main circuit is provided with resonance potential type dicyclo control loop, is connected with feedback sampling circuit, equalizing control circuit, overcurrent-overvoltage short-circuit protection circuit on the described resonance potential type dicyclo control loop.

2. a kind of self cool dicyclo control type charger according to claim 1, it is characterized in that: described feedback sampling circuit is connected with equalizing control circuit, and described overcurrent-overvoltage short-circuit protection circuit is in parallel with feedback sampling circuit.

3. a kind of self cool dicyclo control type charger according to claim 1 and 2 is characterized in that: also be provided with input protection circuit and output protection circuit on the described charger charging main circuit.

4. a kind of self cool dicyclo control type charger according to claim 1 and 2, it is characterized in that: the casing of described charger body is provided with the self-cold radiating device.

5. a kind of self cool dicyclo control type charger according to claim 3, it is characterized in that: the casing of described charger body is provided with the self-cold radiating device.

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