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Overvoltage protection circuit, method and electrical equipment

An overvoltage protection circuit and overvoltage protection technology, applied in the direction of electrical components, regulating electrical variables, output power conversion devices, etc., can solve the problem of not considering the influence of the transformer T chip, voltage false triggering chip overvoltage protection, pulling down Target chip overvoltage protection and other issues

Active Publication Date: 2021-04-02
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above circuit does not take into account the impact of the leakage inductance of the transformer T on the chip, and the sudden surge in voltage caused by the leakage inductance will undoubtedly trigger the overvoltage protection of the chip by mistake.
[0004] In the related art, the current change of the optocoupler pulls down the enable pin of the target chip to realize overvoltage protection, which causes the leakage inductance of the transformer to trigger the overvoltage protection by mistake. No effective solution has been proposed yet.

Method used

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  • Overvoltage protection circuit, method and electrical equipment
  • Overvoltage protection circuit, method and electrical equipment
  • Overvoltage protection circuit, method and electrical equipment

Examples

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Embodiment 1

[0028]References before describing the further details of the embodiments of the present applicationfigure 2 A optional overvoltage protection circuit that can be used to implement the principles of the present application is described. In its most basic configuration,figure 2 It is a schematic diagram of an overvoltage protection circuit according to an embodiment of the present invention. For the purposes of the description, the circuit structure drawn is only an example of a suitable environment, and any limitations are not presented for the scope or function of the application. This circuit should not be interpreted asfigure 2 Any component or a combination thereof has any dependency or demand.

[0029]Such asfigure 1 As shown, the overvoltage protection circuit provided herein includes:

[0030]The first voltage regulator unit is connected between the transformer and the target pin, and the output voltage on the primary winding of the transformer is used in the transformer and the ta...

Embodiment 2

[0062]Under the overvoltage protection circuit provided in Example 1, the present embodiment provides a method of overvoltage protection from the angle of the chip, and it is to be explained, and the steps shown in the drawings may be in the drawings. The group computer executable instructions are executed in a computer system, and although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in the order herein.

[0063]Figure 4It is an optional overvoltage protection method according to an embodiment of the present invention, such asFigure 4As shown, the method includes the following steps:

[0064]Step S402, a second voltage from the first voltage and the second voltage regulator unit from the first voltage regulator, wherein the first voltage regulator unit and the second regulated unit are connected in series, the primary windings and target leads in series in the transformer. Between the foot, the opening voltage of the second reg...

Embodiment 3

[0096]According to an embodiment of the present invention, an electrical apparatus includes an overvoltage protection circuit including the above-described embodiment 1.

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Abstract

The invention discloses an overvoltage protection circuit, an overvoltage protection method and electric equipment. The overvoltage protection circuit comprises a first voltage stabilization unit, a second voltage stabilization unit and a filtering unit, wherein the first voltage stabilization unit is connected between a transformer and a target pin and used for stabilizing output voltage on a primary winding of the transformer, and the first voltage stabilization unit comprises a first capacitor; the second voltage stabilization unit is connected with the first voltage stabilization unit in parallel, and the turn-on voltage of the second voltage stabilization unit is higher than that of the first voltage stabilization unit; the filtering unit is connected between the input end of the second voltage stabilization unit and the ground, the filtering unit comprises a second capacitor, and the capacitance value of the second capacitor is less than that of the first capacitor. According tothe invention, the technical problem that the overvoltage protection is triggered by the leakage inductance of the transformer by mistake due to the fact that an enabling pin of a target chip is pulled down by the current change of an optocoupler to achieve overvoltage protection in the prior art is solved.

Description

Technical field[0001]The present invention relates to the field of overvoltage protection, and in particular, there is an overvoltage protection circuit, a method, and a power plant.Background technique[0002]With a power supply, there is a rated operating voltage, and the power supply that matches its operating voltage is normal in the power supply.figure 1 A overvoltage protection circuit in the prior art, such asfigure 1 As shown, the primary winding of the transformer T is divided into the main winding N1 and the auxiliary winding N2. The main winding N1 is used to store electrical energy, and the storage power is supplied to the power supply Vcc pin of the chip by the auxiliary winding N2, and the other hand passes the secondary After the windings and rectifier modules are converted to different voltages, such as 24V, 12V, transmit to the load, such as electrical equipment. When the voltage of the secondary winding and the rectifier module exceeds the preset value, the regulator...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M3/335
CPCH02M1/32H02M3/33523
Inventor 吴永芳
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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