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Constant current charge pump light-emitting diode (LED) drive circuit

A technology of LED driving and constant current circuit, which is applied in the direction of electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problems of affecting the conversion circuit efficiency, low conversion efficiency of LED driving circuit, power consumption, etc., and avoid large inrush current. Effect

Active Publication Date: 2015-07-22
SHANGHAI COOLED ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power is cut off in this way and then turned on immediately, the temperature of the thermistor will be affected by the preheating and will continue to maintain a small resistance state, so there is also the danger of a large surge current, and the resistor connected in series in the circuit will consume power , affecting the efficiency of the conversion circuit, resulting in low conversion efficiency of the LED drive circuit

Method used

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  • Constant current charge pump light-emitting diode (LED) drive circuit
  • Constant current charge pump light-emitting diode (LED) drive circuit
  • Constant current charge pump light-emitting diode (LED) drive circuit

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Embodiment Construction

[0027] An embodiment of the present invention provides a constant current charge pump LED driving circuit, which is used to limit the surge current of the LED driving circuit and improve the power factor of the LED driving circuit.

[0028] see figure 2 , is shown as a functional block diagram of a constant current charge pump LED drive circuit according to an embodiment of the present invention, which includes a rectifier bridge circuit 11, an LED string circuit 12 and a capacitor 13, and further includes a first constant current circuit 14, a second constant current circuit 15 and A reference voltage source circuit 16, wherein the rectifier bridge circuit 11, the capacitor 13 and the first constant current circuit 14 are connected in series to form a first current loop; the rectifier bridge circuit 11, the LED string circuit 12 and the second constant current circuit 15 are connected in series to form a second current loop ; The reference voltage source circuit 16 is used t...

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Abstract

The invention discloses a constant current charge pump light-emitting diode (LED) drive circuit which is used for limiting the surge current of the LED drive circuit and improving power factors of the LED drive circuit. The constant current charge pump LED drive circuit comprises a rectifier bridge circuit, an LED series circuit and a capacitor, and further comprises a first constant current circuit, a second constant current circuit and a reference voltage source circuit, wherein the rectifier bridge circuit and the capacitor are in series connection with the first constant current circuit to form a first current circuit, the rectifier bridge circuit and the LED series circuit are in series connection with the second constant current circuit to form a second current circuit, and the reference voltage source circuit is used for providing a reference voltage for the first constant current circuit and the second constant current circuit.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a constant current charge pump LED drive circuit. Background technique [0002] In the prior art, the LED string circuit is usually driven by a DC power supply mode in which the AC power is rectified and smoothed by a filter capacitor. This driving mode is extremely prone to surge currents. Inrush current refers to the large charging current that flows into the filter capacitor after the power is turned on. When the charge is not stored in the filter capacitor, a large inrush current will flow once the power is turned on, and if there is no inrush current suppression circuit, the inrush current will theoretically become infinite. If the suppression resistor is not added, the maximum value of the surge current can be tens of amperes, which may cause the breaker to trip when the light is turned on, or cause the contacts of the power switch to melt and adhere at high temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 王钦恒
Owner SHANGHAI COOLED ELECTRONICS CO LTD
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