In-phase AC (Alternating Current) signal amplification type grid driving system based on constant-current protection

An AC signal, constant current protection technology, applied in lighting devices, light sources, electric light sources, etc., can solve problems such as easily damaged drive systems, and achieve the effects of short start-up time, reduced current noise, and avoidance of external electromagnetic interference

Inactive Publication Date: 2015-09-16
CHENGDU CHUANGTU TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the current grid drive circuit does not detect the working current. If the mains fluctuates, it is easy to damage the drive system itself or the LED, and provide a reasonable structure design based on constant current protection. In-phase AC signal amplified gate drive system

Method used

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  • In-phase AC (Alternating Current) signal amplification type grid driving system based on constant-current protection
  • In-phase AC (Alternating Current) signal amplification type grid driving system based on constant-current protection

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Embodiment

[0021] Such as figure 1 As shown, the present invention includes a driving chip M, a self-locking light excitation circuit, a logic protection emitter coupled amplifier circuit, a driving circuit connected to the driving chip M, and an in-phase AC circuit arranged between the driving chip M and the self-locking excitation circuit It consists of a signal amplifying circuit and a constant current protection circuit connected in series between the logic protection emitter coupling amplifying circuit and the driving circuit.

[0022] The in-phase AC signal amplifying circuit is used to amplify the pulse signal generated by the self-locking excitation circuit to avoid signal attenuation. It consists of a power amplifier P1, a resistor R4, a resistor R5 and a polar capacitor C5. When connecting, one end of the resistor R4 is connected to the VCC pin of the driver chip M, and the other end is connected to the positive input end of the power amplifier P1; one end of the resistor R5 i...

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PUM

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Abstract

The invention discloses an in-phase alternating-current signal amplifying type gate drive system based on a logic protection emitter-coupled type. The in-phase alternating-current signal amplifying type gate drive system is mainly composed of a drive chip M, a self-locking optical excitation circuit, a drive circuit connected with the drive chip M and an in-phase alternating-current signal amplifying circuit arranged between the drive chip M and the self-locking optical excitation circuit. The in-phase alternating-current signal amplifying type gate drive system is characterized in that a logic protection emitter-coupled circuit is further connected between the output end of a NOR gate IC2 and the negative electrode output end of a NOR gate IC3 in series. According to the in-phase alternating-current signal amplifying type gate drive system, the relevant function of the drive chip M can be automatically excited according to external illumination condition, an extra starting device is not needed, and therefore the in-phase alternating-current signal amplifying type gate drive system is quite low in power consumption.

Description

technical field [0001] The invention relates to an LED drive circuit, in particular to an in-phase AC signal amplified grid drive system based on constant current protection. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. Since the LED lamp is different from the traditional incandescent lamp, it needs to be driven by a dedicated driving circuit. However, the currently widely used gate drive circuit does not detect the working current. If the mains power fluctuates, it is easy to damage the drive system itself or the LED. Contents of the invention [0003] The purpose of the present invention is to overcome the defect that the current grid drive circuit does not detect the working current. If the mains fluctuates, it is easy to damage the drive system itself or the LED, and provide a reas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 周云扬
Owner CHENGDU CHUANGTU TECH
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