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Compensation circuit for overcurrent protection

A compensation circuit and overcurrent protection technology, applied in electrical components, output power conversion devices, etc., can solve the problem of inconsistent overcurrent protection points, and achieve the effects of low power consumption, easy implementation, and simple devices

Pending Publication Date: 2018-12-18
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the technical defects in the above-mentioned prior art, the present invention proposes a compensation circuit for overcurrent protection with a simple structure, which can solve the problem that the overcurrent protection point of the existing overcurrent protection circuit is inconsistent with the input voltage change

Method used

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Examples

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Effect test

no. 1 example

[0047] Figure 4 The overcurrent protection compensation circuit of the first implementation example of the present invention includes a voltage signal sampling voltage divider circuit, a sampling signal amplification circuit and a signal adjustment circuit.

[0048] The voltage signal sampling voltage dividing circuit is composed of four components including a resistor R1, a resistor R2, a resistor R3 and a capacitor C1. The three devices of resistor R1, resistor R2 and resistor R3 are connected in series, and one port of resistor R1 is connected to the sampling input terminal of the input voltage signal. The other end is connected to resistor R2; one end of resistor R2 is connected to resistor R1, the other end is connected to resistor R3 and capacitor C1; one end of resistor R3 is connected to resistor R2 and capacitor C1, and the other end is connected to circuit ground; one end of capacitor C1 is connected to To the ground wire of the circuit, while the other end is conn...

no. 2 example

[0058] Figure 5 It is the compensation circuit for overcurrent protection in the second embodiment of the present invention. The main circuit is the same as the first embodiment. The difference from the first embodiment is that the input voltage signal is sampled from the low-voltage signal output from the auxiliary winding of the power supply after rectification. DC VCC. A compensating circuit for overcurrent protection includes a voltage signal sampling and dividing circuit, a sampling signal amplifying circuit and a signal adjusting circuit.

[0059] The voltage signal sampling voltage dividing circuit is composed of four components including a resistor R1, a resistor R2, a resistor R3 and a capacitor C1. Resistor R1, resistor R2, and resistor R3 are connected in series. One port of resistor R1 is connected to the sampling input terminal of the input voltage signal. The voltage signal sampled by the input voltage signal comes from the voltage signal VCC rectified by the a...

no. 3 example

[0064] Figure 6 It is the compensation circuit for overcurrent protection of the third embodiment of the present invention, the main circuit is the same as the first embodiment, and the difference from the first embodiment is that the power supply of the sampling signal amplification circuit of the third embodiment comes from the power control chip The reference voltage output port Vref. The advantage of this embodiment compared with the first embodiment is that the power supply of the sampling signal amplification circuit comes from the reference voltage output port Vref of the power control chip. The voltage of this port is relatively more stable than VCC, and the operation of the amplification circuit is not affected by the fluctuation of VCC caused by the outside world. Influence, so the work of the amplifier circuit is more stable.

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Abstract

A compensation circuit for overcurrent protection includes a voltage signal sampling and dividing circuit, a sampling signal amplifying circuit and a signal regulating circuit, wherein, the voltage signal sampling and voltage dividing circuit is a three-port network, one end of the voltage signal sampling and voltage dividing circuit is used as an input end of a compensation circuit for receivingthe voltage sampling signal, one end of the voltage signal amplifying circuit is grounded, and the other end of the voltage signal sampling and voltage dividing circuit is used as an output end of thevoltage signal sampling and voltage dividing circuit, and is connected with the sampling signal amplifying circuit; the sampling signal amplification circuit is a three-port network, one end of whichis a power supply end of the sampling signal amplification circuit, one end of which is connected with a voltage sampling and voltage dividing circuit of the voltage signal, and the other end of which is connected with a signal regulating circuit as an output end of the sampling signal amplification circuit; and the signal regulating circuit is a two-port network, one end of the signal regulatingcircuit is connected with the sampling signal amplifying circuit, and the other end is used as the output end of the compensating circuit. Compared with the compensation circuit of the prior art, theinvention can get rid of the limitation of regulating the compensation current through a resistor in the prior art, and can divide the voltage by a relatively large resistor.

Description

technical field [0001] The invention relates to a switching power supply, in particular to an overcurrent protection compensation circuit for a switching power supply converter. Background technique [0002] Flyback switching power supply is the most widely used topology type in switching power supply. It has simple circuit structure, low cost, low design difficulty and high reliability. It is widely used in consumer electronics, white goods, LED lighting, instrumentation, industrial control, and smart home. , mobile communications and other power supply systems in various electronic industries. [0003] In different application areas, the input voltage of the flyback switching power supply will be different. For example, the mains power in Japan is 110V, and the mains power in China is 220V. Considering the fluctuation factors of grid voltage, the global input voltage range is 90V~264V. In order to ensure the stability of the power supply and ensure the safety of the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 朱鹏刘少雄
Owner MORNSUN GUANGZHOU SCI & TECH
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