CN204206576U - A kind of LED drive power circuit - Google Patents

Abstract

The utility model discloses a kind of LED drive power circuit, comprise chip U1, chip U2, rectifier bridge Q, metal-oxide-semiconductor VT and transformer T.The utility model LED drive power circuit device used is few, loss is low, there is higher power factor and efficiency, compared with the LED drive power of equal-wattage grade, its High Power Factor, the technical requirement of associated solenoid compatibility and current harmonics component can be met well, particularly all the more so in the application scenario of wide electric main input voltage range, this power circuit is in the heavy duty application scenario of output, and circuit has greater efficiency, caloric value is little, reduces the infringement to LED lamp holder.

Description

A kind of LED drive power circuit

Technical field

The utility model relates to a kind of power circuit, specifically a kind of LED drive power circuit.

Background technology

In energy crisis and climate warming problem more and more serious today, energy-conservationly become social focus subject under discussion with environmental protection.LED gets more and more people's extensive concerning because of features such as plurality of advantages such as it is efficient, energy-saving and environmental protection, life-span length, rich color, little, the resistance to flicker of volume, reliability are high, regulation and control are convenient, is considered to 21 century the most promising lighting source.Traditional incandescent lamp efficiency is low, power consumption is high; Fluorescent lamp power saving, but useful life is short, frangible, and there is mercury pollution in discarded object; There is the shortcomings such as efficiency is low, power consumption is high, the life-span is short, hazards of electromagnetic radiation in high-intensity gas discharge lamp; If current poor efficiency, the traditional lighting of highly energy-consuming can be replaced with LED illumination, current more and more urgent energy shortage and ecological deterioration problem can be alleviated undoubtedly.Due to voltage-current characteristic and the temperature characterisitic of LED self, make the susceptibility of LED to electric current be higher than susceptibility to voltage, therefore can not be powered directly to LED by traditional power supply.Therefore, make with LED the problem that first lighting source will solve power drives, regulate although traditional LED drive power can realize LED luminance, can not realize power factor correction, input power factor is lower, and harmonic ratio is larger.

Utility model content

The purpose of this utility model is to provide a kind of LED drive power circuit having power factor emendation function, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of LED drive power circuit, comprise chip U1, chip U2, rectifier bridge Q, metal-oxide-semiconductor VT and transformer T, described rectifier bridge Q pin 2 is connected 220V alternating current two ends respectively with pin 4, rectifier bridge Q pin 1 connects electric capacity C1 respectively, resistance R1, resistance R2, electric capacity C2 and transformer T coil L1, the transformer T coil L1 other end connects electric capacity C3 respectively, diode D1 positive pole, the D pole of diode D2 negative pole and metal-oxide-semiconductor VT, electric capacity C3 other end contact resistance R4, the resistance R4 other end is contact resistance R3 respectively, electric capacity C1 and rectifier bridge Q pin 3 also ground connection, the S pole of described metal-oxide-semiconductor VT connects diode D2 positive pole and chip U1 pin 5 respectively, the G pole of metal-oxide-semiconductor VT connects chip U1 pin 3, described diode D1 negative pole is the contact resistance R2 other end and the electric capacity C2 other end respectively, the described resistance R3 other end is the contact resistance R1 other end and chip U1 pin 1 respectively, chip U1 pin 6 contact resistance R5, the resistance R5 other end connects diode D3 positive pole and transformer T coil L2 respectively, transformer T coil L2 other end ground connection, transformer T coil L3 one end connects electric capacity C6 respectively, resistance R8 and LED group, the transformer T coil L3 other end connects the electric capacity C6 other end and resistance R7 and ground connection respectively, the resistance R7 other end connects the LED group other end, the described resistance R8 other end is contact resistance R9 respectively, chip U2 pin 6 and resistance R12, chip U2 pin 4 contact resistance R13 ground connection, the resistance R13 other end connects chip U2 pin 7, the described resistance R12 other end connects electric capacity C7, the electric capacity C7 other end connects electric capacity C8 and ground connection, electric capacity C8 other end contact resistance R10, the resistance R10 other end is the contact resistance R9 other end and chip U2 pin 2 respectively, chip U2 pin 1 connects power supply VCC and photoelectrical coupler U3 pin 3 respectively, chip U2 pin 3 connects photoelectrical coupler U3 pin 4 by resistance R11, photoelectrical coupler U3 pin 1 connects ground capacity C5 respectively, diode D3 negative pole and chip U1 pin 8, photoelectrical coupler U3 pin 2 connects chip U1 pin 9, chip U1 pin 7 connects electric capacity C4 and resistance R6 respectively, the resistance R6 other end connects the electric capacity C4 other end and ground connection respectively.

As further program of the utility model: described chip U1 model is FAN7527B.

As further program of the utility model: described chip U2 model is TM101.

As the utility model further scheme: described photoelectrical coupler U3 model is 6N138.

Compared with prior art, the beneficial effects of the utility model are: the utility model LED drive power circuit device used is few, loss is low, there is higher power factor and efficiency, compared with the LED drive power of equal-wattage grade, its High Power Factor, the technical requirement of associated solenoid compatibility and current harmonics component can be met well, particularly all the more so in the application scenario of wide electric main input voltage range, this power circuit is in the heavy duty application scenario of output, circuit has greater efficiency, caloric value is little, reduce the infringement to LED lamp holder.

Accompanying drawing explanation

Fig. 1 is a kind of circuit diagram of LED drive power circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1, in the utility model embodiment, a kind of LED drive power circuit, comprise chip U1, chip U2, rectifier bridge Q, metal-oxide-semiconductor VT and transformer T, rectifier bridge Q pin 2 and pin 4 are connected 220V alternating current two ends respectively, rectifier bridge Q pin 1 connects electric capacity C1 respectively, resistance R1, resistance R2, electric capacity C2 and transformer T coil L1, the transformer T coil L1 other end connects electric capacity C3 respectively, diode D1 positive pole, the D pole of diode D2 negative pole and metal-oxide-semiconductor VT, electric capacity C3 other end contact resistance R4, the resistance R4 other end is contact resistance R3 respectively, electric capacity C1 and rectifier bridge Q pin 3 also ground connection, the S pole of metal-oxide-semiconductor VT connects diode D2 positive pole and chip U1 pin 5 respectively, the G pole of metal-oxide-semiconductor VT connects chip U1 pin 3, diode D1 negative pole is the contact resistance R2 other end and the electric capacity C2 other end respectively, the resistance R3 other end is the contact resistance R1 other end and chip U1 pin 1 respectively, chip U1 pin 6 contact resistance R5, the resistance R5 other end connects diode D3 positive pole and transformer T coil L2 respectively, transformer T coil L2 other end ground connection, transformer T coil L3 one end connects electric capacity C6 respectively, resistance R8 and LED group, the transformer T coil L3 other end connects the electric capacity C6 other end and resistance R7 and ground connection respectively, the resistance R7 other end connects the LED group other end, the resistance R8 other end is contact resistance R9 respectively, chip U2 pin 6 and resistance R12, chip U2 pin 4 contact resistance R13 ground connection, the resistance R13 other end connects chip U2 pin 7, the resistance R12 other end connects electric capacity C7, the electric capacity C7 other end connects electric capacity C8 and ground connection, electric capacity C8 other end contact resistance R10, the resistance R10 other end is the contact resistance R9 other end and chip U2 pin 2 respectively, chip U2 pin 1 connects power supply VCC and photoelectrical coupler U3 pin 3 respectively, chip U2 pin 3 connects photoelectrical coupler U3 pin 4 by resistance R11, photoelectrical coupler U3 pin 1 connects ground capacity C5 respectively, diode D3 negative pole and chip U1 pin 8, photoelectrical coupler U3 pin 2 connects chip U1 pin 9, chip U1 pin 7 connects electric capacity C4 and resistance R6 respectively, the resistance R6 other end connects the electric capacity C4 other end and ground connection respectively.

Chip U1 model is FAN7527B.

Chip U2 model is TM101.

Photoelectrical coupler U3 model is 6N138.

Operation principle of the present utility model is: refer to Fig. 1, voltage on electric capacity C1 is the voltage after bridge rectifier, the electric current of metal-oxide-semiconductor is flow through in resistance R2 sampling, carry out the control of Cycle by Cycle threshold currents, the current peak of metal-oxide-semiconductor is made to be unlikely to too large, when guaranteeing load short circuits there is not magnetic saturation in transformer, the current over-zero utilizing auxiliary winding to complete a transformer winding detects, control the work that metal-oxide-semiconductor restarts the next switch conduction work period, the external resistance R6 resistance of chip U1 pin 7 is in the scope of tens kilo-ohms, make circuit working in the working method of " accurate no-voltage conducting ".Resistance R6 resistance value value is relevant with the output capacitance of power switch pipe metal-oxide-semiconductor with the inductance value of transformer T coil L1, and in this circuit, value is 33K.Resistance R8 sampling load LED lamp group current signal, electric current in resistance R8 sampling LED group and the reference signal on chip TM101 compare, through amplifier, current constant control is carried out to output through error, the brightness of LED group and flow through that the size of current of LED group is directly proportional substantially, as long as the size of current controlling to flow through LED group just can regulate the brightness of LED group.Resistance R7, voltage in resistance R8 sampling LED group and the reference signal on chip TM101 compare, through error amplifier to output voltage control, send into by optocoupler the error amplifier controlling core U1 after sending into this two paths of signals phase "AND" of chip TM101 and enter multiplier, another road of multiplier is the city's signal of telecommunication after full-wave rectification, the product of this two paths of signals is exactly that multiplier exports, this output signal makes inductive current follow the tracks of the output waveform signals of multiplier, the pwm pulse produced controls the switch of metal-oxide-semiconductor, realize the control to load current and input current, the constant current voltage limiting control of realization to LED group and the correction of input power factor.

The utility model LED drive power circuit device used is few, loss is low, there is higher power factor and efficiency, compared with the LED drive power of equal-wattage grade, its High Power Factor, the technical requirement of associated solenoid compatibility and current harmonics component can be met well, particularly all the more so in the application scenario of wide electric main input voltage range, this power circuit is in the heavy duty application scenario of output, circuit has greater efficiency, caloric value is little, reduces the infringement to LED lamp holder.

Claims (4)

1. a LED drive power circuit, comprise chip U1, chip U2, rectifier bridge Q, metal-oxide-semiconductor VT and transformer T, it is characterized in that, described rectifier bridge Q pin 2 is connected 220V alternating current two ends respectively with pin 4, rectifier bridge Q pin 1 connects electric capacity C1 respectively, resistance R1, resistance R2, electric capacity C2 and transformer T coil L1, the transformer T coil L1 other end connects electric capacity C3 respectively, diode D1 positive pole, the D pole of diode D2 negative pole and metal-oxide-semiconductor VT, electric capacity C3 other end contact resistance R4, the resistance R4 other end is contact resistance R3 respectively, electric capacity C1 and rectifier bridge Q pin 3 also ground connection, the S pole of described metal-oxide-semiconductor VT connects diode D2 positive pole and chip U1 pin 5 respectively, the G pole of metal-oxide-semiconductor VT connects chip U1 pin 3, described diode D1 negative pole is the contact resistance R2 other end and the electric capacity C2 other end respectively, the described resistance R3 other end is the contact resistance R1 other end and chip U1 pin 1 respectively, chip U1 pin 6 contact resistance R5, the resistance R5 other end connects diode D3 positive pole and transformer T coil L2 respectively, transformer T coil L2 other end ground connection, transformer T coil L3 one end connects electric capacity C6 respectively, resistance R8 and LED group, the transformer T coil L3 other end connects the electric capacity C6 other end and resistance R7 and ground connection respectively, the resistance R7 other end connects the LED group other end, the described resistance R8 other end is contact resistance R9 respectively, chip U2 pin 6 and resistance R12, chip U2 pin 4 contact resistance R13 ground connection, the resistance R13 other end connects chip U2 pin 7, the described resistance R12 other end connects electric capacity C7, the electric capacity C7 other end connects electric capacity C8 and ground connection, electric capacity C8 other end contact resistance R10, the resistance R10 other end is the contact resistance R9 other end and chip U2 pin 2 respectively, chip U2 pin 1 connects power supply VCC and photoelectrical coupler U3 pin 3 respectively, chip U2 pin 3 connects photoelectrical coupler U3 pin 4 by resistance R11, photoelectrical coupler U3 pin 1 connects ground capacity C5 respectively, diode D3 negative pole and chip U1 pin 8, photoelectrical coupler U3 pin 2 connects chip U1 pin 9, chip U1 pin 7 connects electric capacity C4 and resistance R6 respectively, the resistance R6 other end connects the electric capacity C4 other end and ground connection respectively.

2. LED drive power circuit according to claim 1, is characterized in that, described chip U1 model is FAN7527B.

3. LED drive power circuit according to claim 1, is characterized in that, described chip U2 model is TM101.

4. LED drive power circuit according to claim 1, is characterized in that, described photoelectrical coupler U3 model is 6N138.