Overload protection and short circuit recoverable PWM dimmer

An overload protection and dimmer technology, applied in the field of dimmers, can solve problems such as single function, poor stability, and unrecoverable output short circuit, and achieve powerful functions, VCC undervoltage protection, anti-reverse connection protection, and circuit structure reliability strong effect

Pending Publication Date: 2019-04-16
LETARON ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current dimmer circuit has a simple structure, poor stability, single function, and the output short circuit is not recoverable

Method used

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  • Overload protection and short circuit recoverable PWM dimmer

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] Such as figure 1 As shown, an overload protection and short circuit recoverable PWM dimmer includes a PWM modulation circuit, an overcurrent detection circuit, an undervoltage protection circuit, and an input and output anti-reverse connection protection circuit; the PWM modulation circuit includes a driver chip U1 and The potentiometer CON3 adjusts the duty cycle of the PWM signal output by the driver chip U1 through the knob potentiometer; the overcurrent detection circuit includes a sampling resistor R6 connected in series at the dimming output terminal, and the operational amplifier U2B is connected to the sampling resistor R6. R6 performs current sampling, and controls the switch of the switching tube Q3 according to the sampling current output to control the VCC input on-off of the driver chip U1; the undervoltage protection circuit includes an o...

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Abstract

The invention discloses an overload protection and short circuit recoverable PWM dimmer which comprises a PWM modulation circuit, an overcurrent detection circuit, an undervoltage protection circuit and an input and output anti-reverse-connection protection circuit. The overload protection and short circuit recoverable PWM dimmer has the advantages of high reliability of circuit structure and powerful functions, and PWM modulation, overcurrent detection, VCC undervoltage protection and input and output anti-reverse-connection protection can be achieved.

Description

technical field [0001] The invention relates to the technical field of dimmers, in particular to an overload protection and short circuit recoverable PWM dimmer. Background technique [0002] Dimmer refers to an electrical device that changes the luminous flux of the light source in the lighting device and adjusts the illuminance level. Large-capacity and constitute a system called dimming device. Its basic principle is to change the current effective value of the input light source to achieve the purpose of dimming. [0003] The current dimmer circuit has simple structure, poor stability, single function, and output short circuit cannot be recovered. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide an overload protection and short circuit recoverable PWM dimmer aiming at the deficiencies of the above prior art. [0005] In order to solve the above technical problems, the technical solution adopted by the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B47/10
Inventor 程厚明
Owner LETARON ELECTRONICS
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