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Low-noise load driving circuit structure

A load driving circuit, low noise technology, applied in electric light sources, electrical components, adjusting electrical variables, etc., can solve the problems of low power factor, power mismatch, poor stability, etc., to achieve enhanced anti-EMI interference ability, reduce dimming The effect of flickering and good dimming performance

Inactive Publication Date: 2018-03-23
SICHUAN QIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above prior art, the purpose of the present invention is to provide a low-noise load drive circuit structure, which aims to solve the problem of power mismatch, low power factor, fixed phase cut, dimming flicker and poor stability in the existing load drive circuit. And technical problems such as low anti-electromagnetic interference ability

Method used

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Examples

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Effect test

Embodiment 1

[0025] The dynamic adjustment circuit 104, wherein the zener diode D3 and the first capacitor C1 receive the output voltage of the rectifier bridge D1 through the resistor R2, and accumulate it in the first capacitor C1 to obtain the basis for generating a blocking current; the first field effect transistor Q2 receives the output voltage of the rectifier bridge D1 through the resistor R2. When the received voltage exceeds the reference level, a blocking current is generated to trigger the thyristor switch; the first field effect transistor Q2 has the function of a switch, and here it is in the conduction state.

Embodiment 2

[0027] In the dynamic adjustment circuit 104, the voltage received by the zener diode D3 through the resistor R2 is very high, that is, the voltage value of the voltage node 107 is relatively high, and when it is higher than the reverse conduction voltage of the zener diode D3, the zener diode D3 reverses When the direction is turned on, the first capacitor C1 will be discharged, and the first field effect transistor Q2 will be cut off and in an off state; when the circuit needs to be reset, the control unit 103 resets the dynamic adjustment circuit 104 through the diode D2 to restore the saturation voltage value or below the threshold voltage value.

Embodiment 3

[0029] The control unit 103 detects the source voltage of the first field effect transistor Q1 through a voltage detection point; when the voltage value is abnormal (high or low), the control unit 103 sets the gate voltage of the second field effect transistor Q2 high , so that the switching diode D5 is turned off, the diode D4 is turned on, the second power supply V2 is introduced, the first diode D2 is reversed, and the dynamic adjustment circuit 104 is reset.

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Abstract

A low-noise load driving circuit structure aims to solve the technical problems that existing load driving circuits have power mismatch, fixed phase cut, dimming flicker, poor stability, and low immunity to electromagnetic interference. The features of the low-noise load driving circuit structure include a switch circuit connecting a first power source; a rectifier bridge, wherein the input port of the rectifier bridge is connected to the switch circuit and the first power source; an EMI filter circuit, wherein the input end of the EMI filter circuit is connected to the output end of the rectifier bridge; a dynamic adjustment circuit, wherein the input end of the dynamic adjustment circuit is connected to the output end of the EMI filter circuit; a control unit connecting the dynamic adjustment circuit; a voltage compensation circuit which is connected to the control unit and includes a bleeder circuit and a bias circuit; an output circuit connecting the output end of the rectifier bridge and the output end of the dynamic adjustment circuit; and an output filtering inductor connecting the output circuit. The low-noise load driving circuit structure is used to drive the load.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a low-noise load driving circuit structure. Background technique [0002] The existing load drive circuit is generally equipped with a traditional thyristor switch, which has a high trigger current and high operating power, while the load operating power is relatively low, and if there is a dimming circuit, the load operating power will be further increased. As a result, the traditional thyristor cannot reach the trigger current, causing the device to fail, causing the load to glow and flicker; as the luminous intensity continues to weaken, the maintenance current in the drive circuit will become smaller and smaller, and eventually it will be lower than the threshold of the thyristor switch. And lead to cut-off; because the phase of the blocking current is fixed, the length of the cut-off region of the thyristor is fixed, and the trigger phase cannot be adjusted; there is a lack of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H02M1/44H02M1/32H02M3/156H05B44/00
CPCH02M1/32H02M1/44H02M3/156H05B45/37Y02B20/30
Inventor 江明泓
Owner SICHUAN QIXING ELECTRONICS
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