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LED drive circuit with surge suppression

A technology of LED drive and surge suppression, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of LED load overvoltage, omission of load power supply protection, etc., and achieve the effect of LED load safety

Inactive Publication Date: 2014-03-12
林燕祺
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the LED power supply circuit, the detection of the power supply voltage of the load is generally completed by a dedicated chip, and in some simple LED power supply circuits, the protection of the load power supply is often omitted on the side. When the voltage surges, the LED load momentary overvoltage occurs

Method used

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  • LED drive circuit with surge suppression

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Embodiment Construction

[0008] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below.

[0009] Such as figure 1 The schematic diagram of the circuit principle of the present invention is shown.

[0010] The LED load power supply terminal of the present invention is composed of a resistance-capacitance voltage circuit composed of resistor R1 and capacitor C1 and a full-wave rectifier circuit composed of diodes D1~D4. Capacitors C2 and C3 are used to stabilize the rectified current and voltage. In order to make the LED load work stably in the case of surge, the rectified voltage output terminal A varistor Rv is also connected in parallel to discharge the instantaneous pulse high voltage in the input power supply to the ground, thereby protecting the LED load from being broken down by the instantaneous high voltage.

[0011] The above disclosure is only a preferred embodiment of the present inv...

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Abstract

The embodiment of the invention discloses an LED drive circuit with surge suppression. A voltage-sensitive resistor is connected in parallel between power supply ends of an LED load, and the LED load is connected in series with a current-regulating resistor. With application of the LED drive circuit with surge suppression, the voltage-sensitive resistor is additionally arranged between the power supply ends of the LED load and used for absorbing surge under the situation of maintaining cost of the circuit so that the LED load is ensured to be safe.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit with surge suppression. Background technique [0002] At present, in the LED power supply circuit, the detection of the power supply voltage of the load is generally completed by a dedicated chip, and in some simple LED power supply circuits, the protection of the load power supply is often omitted on the side. When the voltage surges, the LED load A momentary overvoltage occurs. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide an LED driving circuit with surge suppression. It can prevent the surge at the power supply end from affecting the LED load. [0004] In order to solve the above technical problems, an embodiment of the present invention provides an LED drive circuit with surge suppression, a piezoresistor is connected in parallel between the power supply terminals of the LED ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 林燕祺
Owner 林燕祺
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