CN203279284U

CN203279284U - LED lighting power supply drive chip

Info

Publication number: CN203279284U
Application number: CN 201320276206
Authority: CN
Inventors: 王海鹰; 龚茂林
Original assignee: GUIZHOU EWCI OPTICAL ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: GUIZHOU EWCI OPTICAL ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2013-05-20
Filing date: 2013-05-20
Publication date: 2013-11-06
Anticipated expiration: 2023-05-20

Abstract

The utility model discloses an LED lighting power supply drive chip. The LED lighting power supply drive chip comprises a VCC pin, a ZCD pin, an RT pin, a Ctrl pin, an FB pin, a CS pin, a Gate pin E, a GND pin and the like. According to the utility model, the non-isolated AC/DC LED drive chip which works in a quasi-resonance mode is provided; the LED lighting power supply drive chip supports power factor correction, and has the functions of current limiting protection, output over voltage protection, output short circuit protection and over temperature protection; and the product has the characteristics of simple peripheral application circuit, high reliability, long service life, good electromagnetic compatibility, environmental protection, energy saving and low cost, and can make up the blank of the low power consumption high PFC multi performance power supply drive chip in China.

Description

A kind of LED power for illumination source drive chip

Technical field

The utility model relates to a kind of driving chip, particularly a kind of LED power for illumination source drive chip.

Background technology

Domestic light fixture is energy-conservation to driving power in order to satisfy, high-performance, high reliability and demand cheaply, break Europe, the United States, day semiconductor chip company in the monopoly position of LED field of semiconductor illumination, we attempt utilizing advanced integrated circuit (IC) design technology and the high PFC power-saving technology of power supply, design and satisfy T5, T8, T10LED fluorescent tube, the LED such as GU10, E27 bulb lamp, high reliability, long-life, the Electro Magnetic Compatibility that the LED semiconductor lighting products such as LED ceiling light, Down lamp, wall lamp are used is good, environmental protection and energy saving, LED mains lighting supply solution cheaply.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of LED power for illumination source drive chip; the high PFC of this chip, low-power consumption, high precision constant current voltage stabilizing, have excess temperature, overvoltage, under-voltage, short circuit and the multiple safety precautions of open-circuit-protection, thereby overcome the prior art deficiency.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

a kind of LED power for illumination source drive chip, comprise the VCC pin, the ZCD pin, the RT pin, the Ctrl pin, the FB pin, the CS pin, Gate pin E and GND pin, the VCC pin connects VCC under-voltage protection module and VCC clamper and overvoltage protective module, the ZCD pin connects output over-voltage protection module and clamper and zero passage detection module, the RT pin connects saw-toothed wave generator, saw-toothed wave generator connects the positive input terminal of comparator, the Ctrl pin connects negative input end and the transport and placing device output of comparator, the FB pin connects the negative input end of transport and placing device, the CS pin connects Cycle by Cycle current-limiting protection module, Cycle by Cycle current-limiting protection module connects logic module, the Gate pin connects driver module, and driver module connects logic module, output, the logic module of VCC under-voltage protection module, VCC clamper and overvoltage protective module, output over-voltage protection module, position and zero passage detection module, comparator are connected to respectively control chip.

Above-mentioned LED power for illumination source drive chip also comprises the overheat protector module, and the overheat protector module is connected to control chip.

The beneficial effects of the utility model: compared with prior art, the utility model is that a AD/DC LED that works in the non-isolation of quasi-resonant mode drives chip, this chip is supported power factor correction, has complete defencive function, comprise current-limiting protection, output over-voltage protection, output short circuit protection and overheat protector function, have the following advantages: (1) wide input voltage range is wide: 80V-300V; (2) the electric current constant current accuracy is high: ± 3%; Constant current output electric current: 20mA-1000mA; (3) conversion efficiency is high: be better than 95%; (4) high PFC:0.92; (5) accept the PWM non-pole light regulating; (6) working temperature :-40 ℃～+ 85 ℃; Have the safety protection functions such as excess temperature, overvoltage, under-voltage, short circuit and open circuit; (7) CE, UL authentication is supported in the driving of chip solution.And the product peripheral application circuit is simple, has that high reliability, long-life, Electro Magnetic Compatibility are good, environmental protection and energy saving, characteristics cheaply, can make up China in the blank of many performances of the high PFC of low-power consumption power drives chip.

Description of drawings

Fig. 1 is internal module schematic diagram of the present utility model;

Fig. 2 is application circuit of the present utility model.

Below in conjunction with the drawings and specific embodiments, the utility model is further described.

Embodiment

Embodiment.

as shown in Figure 1, comprise the VCC pin, the ZCD pin, the RT pin, the Ctrl pin, the FB pin, the CS pin, Gate pin E, GND pin and overheat protector module, the VCC pin connects VCC under-voltage protection module and VCC clamper and overvoltage protective module, the ZCD pin connects output over-voltage protection module and clamper and zero passage detection module, the RT pin connects saw-toothed wave generator, saw-toothed wave generator connects the positive input terminal of comparator, the Ctrl pin connects negative input end and the transport and placing device output of comparator, the FB pin connects the negative input end of transport and placing device, the CS pin connects Cycle by Cycle current-limiting protection module, Cycle by Cycle current-limiting protection module connects logic module, the Gate pin connects driver module, and driver module connects logic module, output, the logic module of VCC under-voltage protection module, VCC clamper and overvoltage protective module, output over-voltage protection module, position and zero passage detection module, comparator are connected to respectively control chip, the overheat protector module is connected to control chip.

Operation principle of the present utility model is as shown in Figure 2:

1) power tube Q1 conducting: power supply is applied to current sense resistor R9 to voltage by Q1, and on inductance T1 and load LED, inductive current rises, until reach the time ton that chip internal is controlled, and suppose that inductive current peak is Ipp this moment, and power tube turn-offs;

2) power tube Q1 turn-offs: inductance T1 is by load LED, sustained diode 1 and current sense resistor R9 discharge, until that inductive current drops to from peak I pp is zero, and chip ZCD pin position voltage zero-cross subsequently, power tube conducting; Due to load LED electric current current flowing detection all the time resistance R 9, so the average current of R9 is namely the average current of load LED, and after the RC filtering gently of the voltage on resistance R 9 by R3 and C3, be input to the FB pin position of chip, by exporting Ctrl pin position voltage after error amplifier and reference voltage 0.25v, and then the ON time ton of power ratio control pipe Q1, control thereby reach the output current loop.

Execution mode of the present utility model is not limited to above-described embodiment, within the various variations of making under the prerequisite that does not break away from the utility model aim all belong to protection range of the present utility model.

Claims

1. LED power for illumination source drive chip, comprise the VCC pin, the ZCD pin, the RT pin, the Ctrl pin, the FB pin, the CS pin, Gate pin E and GND pin, its spy is: the VCC pin connects VCC under-voltage protection module and VCC clamper and overvoltage protective module, the ZCD pin connects output over-voltage protection module and clamper and zero passage detection module, the RT pin connects saw-toothed wave generator, saw-toothed wave generator connects the positive input terminal of comparator, the Ctrl pin connects negative input end and the transport and placing device output of comparator, the FB pin connects the negative input end of transport and placing device, the CS pin connects Cycle by Cycle current-limiting protection module, Cycle by Cycle current-limiting protection module connects logic module, the Gate pin connects driver module, and driver module connects logic module, output, the logic module of VCC under-voltage protection module, VCC clamper and overvoltage protective module, output over-voltage protection module, position and zero passage detection module, comparator are connected to respectively control chip.

2. LED power for illumination source drive chip according to claim 1, its spy is: also comprise the overheat protector module, the overheat protector module is connected to control chip.