CN202652621U - PF (power factor) correcting circuit for LED driving power supply - Google Patents

PF (power factor) correcting circuit for LED driving power supply Download PDF

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Publication number
CN202652621U
CN202652621U CN 201220233559 CN201220233559U CN202652621U CN 202652621 U CN202652621 U CN 202652621U CN 201220233559 CN201220233559 CN 201220233559 CN 201220233559 U CN201220233559 U CN 201220233559U CN 202652621 U CN202652621 U CN 202652621U
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China
Prior art keywords
resistance
triode
pin
integrated circuit
circuit
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CN 201220233559
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Chinese (zh)
Inventor
李建军
刘春庆
刘祖社
桑旭春
邱纯勇
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SHANDONG CAIXIA ECOLOGICAL LIGHTING EQUIPMENT TECHNOLOGY Co Ltd
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SHANDONG CAIXIA ECOLOGICAL LIGHTING EQUIPMENT TECHNOLOGY Co Ltd
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Abstract

The utility model relates to a PF (power factor) correcting circuit for an LED driving power supply. One end of a resistor R7 is grounded, the other end of the resistor R7 is connected with a base electrode of a triode Q4 through a resistor R8 and connected with a positive electrode of a voltage stabilizing diode D14, a collector electrode of the triode Q4 is connected with a capacitor C9, one end of a resistor R9 is parallelly connected with a base electrode of a triode Q5, an emitting electrode of the triode Q4, an emitting electrode of the triode Q5 and the other end of the capacitor C9 are grounded, the other end of the resistor R9 is connected with a collector electrode of the triode Q5 and is connected with a resistor R19 through a resistor R10, one end of a capacitor C12 is parallelly connected with a pin 2 of an integrated circuit U4, the other end of the resistor R19 and the other end of the capacitor C12 are connected with a pin 1 of an integrated circuit U2 and are connected with a positive electrode of the voltage stabilizing diode D14 and an output end of an optoelectronic coupler OC through a resistor R20, and a negative electrode of the voltage stabilizing diode D14 is connected with a pin 8 of the integrated circuit U2 and connected with another output end of the optoelectronic coupler OC. The PF value of the circuit is improved to be higher than 0.95, and the circuit is more stable in performance.

Description

A kind of LED driving power PF correcting circuit
Technical field
The utility model relates to a kind of driving power, is applicable to the driving of led light source, specifically, relates to a kind of LED driving power PF correcting circuit, belongs to electronic technology field.
Background technology
At present, in the lighting industry, the LED light fixture obtains consumer's consistent favorable comment.The LED light fixture is used for the occasions such as trade, office, commercial affairs, and its brightness is high, light is average, attractive in appearance, energy-conserving and environment-protective.The LED light fixture is in the wide acclaimed while, and its important composition parts-driving power is also constantly paid attention to by the people.Because the driving power quality of LED light fixture has directly restricted the reliability of LED light fixture.The LED device is close to harshness to the requirement of driving power, and the LED light fixture can directly use the electric main of 220V unlike traditional incandescent lamp.The LED light fixture need to drive under 2～3.5 volts low-voltage, needs the complicated translation circuit of design, and different LED light fixtures needs the different driving power of equipment.For guaranteeing the normal operation of LED light fixture, the LED light fixture all adopts constant current-supplying at present.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem: existing circuit adopts integrated design, and surface mount elements and straight cutting element load in mixture on the same wiring board, the manufacturing process relative complex, be unfavorable for producing debugging, more be unfavorable for maintenance maintenance in the future; Because output filter capacitor generally adopts alminium electrolytic condenser, and the life-span of alminium electrolytic condenser is restricting the life-span of power supply, filter capacitor directly is connected with the rectifying tube negative pole in the LED driving power at present, filter capacitor is all in running order during power work, and be in the higher environment of temperature, life-span is shorter, has seriously restricted the bulk life time of power supply.Cause the present LED driving power life-span shorter; The PF value of LED driving power is generally about 0.6, and stability is poor; Resistance R 4 in the pressure-stabilizing constant flow circuit adopts 33K, makes power output circuit lower, can't reach design load 1A, and the constant current control accuracy is low, and the constant current effect is poor.
The utility model content
The technical problems to be solved in the utility model is for above deficiency, a kind of LED driving power PF correcting circuit is provided, overcome that the PF value of driving power is about 0.6 in the prior art, the defective that stability is poor, after adopting described LED driving power with the PF correcting circuit, the PF value is brought up to more than 0.95, and performance is more stable.
For solving above technical problem, the utility model is by the following technical solutions: a kind of LED driving power PF correcting circuit is characterized in that: described PF correcting circuit comprises integrated circuit U4, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, resistance R 15, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, capacitor C 9, capacitor C 10, capacitor C 11, capacitor C 12, triode Q4, triode Q5, triode Q6, triode Q7, voltage stabilizing didoe D14 and diode D15;
One end ground connection of resistance R 7, the other end connects the base stage of triode Q4 and connects the positive pole of voltage stabilizing didoe D14 through resistance R 8;
The collector electrode of triode Q4 connects an end of capacitor C 9, resistance R 9 and connects the base stage of triode Q5;
The other end ground connection of the emitter of triode Q4, triode Q5 emitter, capacitor C 9, the collector electrode of another termination triode Q5 of resistance R 9 and through an end of resistance R 10 connecting resistance R19, capacitor C 12 and connect 2 pin of integrated circuit U4,1 pin of another termination integrated circuit U2 of resistance R 19, capacitor C 12 also connects the positive pole of voltage stabilizing didoe D14 and the output of photoelectrical coupler OC through resistance R 20, and the negative pole of voltage stabilizing didoe D14 connects 8 pin of integrated circuit U2 and connects another output of photoelectrical coupler OC.
One end of 3 pin connecting resistance R11, resistance R 17, resistance R 18 and the capacitor C 11 of described integrated circuit U4;
The other end of resistance R 11 is through the end of resistance R 13 connecting resistance R14 and connect the output of rectifying full bridge, the other end ground connection of resistance R 17 and capacitor C 11 and through the collector electrode of resistance R 15 connecting resistance R12 and triode Q6, the other end of the other end connecting resistance R14 of resistance R 12, the collector electrode of another termination triode Q7 of resistance R 18.
Another kind of prioritization scheme, the base stage connecting resistance R16 of described triode Q7, an end of capacitor C 10, the emitter of another termination triode Q6 of resistance R 16, the other end ground connection of the emitter of triode Q7, capacitor C 10.
Another prioritization scheme, 4 pin of described integrated circuit U4 connect the source S of field effect transistor Q1, and 5 pin of integrated circuit U4 connect the positive pole of diode D6 through resistance R 21.
Further prioritization scheme, 7 pin of described integrated circuit U4 connect the negative pole of diode D15, an end of resistance R 22, and the other end of the positive pole of diode D15, resistance R 22 is through resistance R 23 ground connection.
After the utility model adopts above technical scheme, compared with prior art, have the following advantages: this PF correcting circuit is brought up to the PF value of circuit more than 0.95, and performance is more stable.
Below in conjunction with drawings and Examples the utility model is elaborated.
Description of drawings
Accompanying drawing 1 is the schematic diagram of LED driving power among the utility model embodiment;
Accompanying drawing 2 is schematic diagrams of PF correcting circuit among the utility model embodiment;
Accompanying drawing 3 is schematic diagrams of pressure-stabilizing constant flow circuit among the utility model embodiment;
Among the figure,
The 1-current rectifying and wave filtering circuit, 2-PF correcting circuit, 3-surge absorbing circuit, 4-pressure-stabilizing constant flow circuit, 5-capacitor drive circuit, 6-current detection circuit, 7-single chip machine controlling circuit.
Embodiment
Embodiment, as shown in Figure 1, a kind of LED driving power PF correcting circuit, LED driving power comprise electrical connection:
Current rectifying and wave filtering circuit 1 converts the 220V electric main to the 300V direct current;
PF correcting circuit 2 is brought up to circuit PF value more than 0.95.
Surge absorbing circuit 3, the spike that absorbed power pipe cut-off moment primary winding produces, the protection power tube is not breakdown;
Pressure-stabilizing constant flow circuit 4 changes output end current the variation that is converted to voltage.And this voltage delivered to constant-current circuit;
Capacitor drive circuit 5, the break-make of control filter capacitor;
Current detection circuit 6 detects output current, and the variation of electric current is converted into the variation of voltage.
Single chip machine controlling circuit 7, the control capacitance drive circuit works.
Current rectifying and wave filtering circuit 1 comprises rectifying full bridge and the filter capacitor C1 that is comprised of diode D1, diode D2, diode D3 and diode D4, and the input termination power of rectifying full bridge, filter capacitor C1 are connected in parallel between the output and ground of rectifying full bridge.
Surge absorbing circuit 3 comprises capacitor C 2, resistance R 2 and diode D5, capacitor C 2, the output of one termination rectifying full bridge of resistance R 2, capacitor C 2, the negative pole of another terminating diode D5 of resistance R 2, the positive pole of diode D5 connects the drain D of field effect transistor Q1, the grid G of field effect transistor Q1, source S connects PF correcting circuit 2, the source S of field effect transistor Q1 is through resistance R 3 ground connection, the output of rectifying full bridge is through resistance R 1 connecting resistance R4, one end of capacitor C 3, the output of PF correcting circuit 2 and photoelectrical coupler OC, another output termination PF correcting circuit 2 of photoelectrical coupler OC, the other end ground connection of capacitor C 3, the negative pole of another terminating diode D6 of resistance R 4, the positive pole of diode D6 connects PF correcting circuit 2 and through one group of primary coil ground connection of transformer T1, the positive pole of diode D5 connects the output of rectifying full bridge through another group primary coil of transformer T1, the positive pole of one terminating diode D7 of transformer T1 secondary coil and an end of capacitor C 4, the other end of capacitor C 4 connects the negative pole of diode D7 through resistance R 5, pressure-stabilizing constant flow circuit 4 and capacitor drive circuit 5, the positive pole of another terminating diode D8 of transformer T1 secondary coil, the negative pole of diode D8 is through capacitor C 5 ground connection and connect pressure-stabilizing constant flow circuit 4, and two inputs of photoelectrical coupler OC connect respectively pressure-stabilizing constant flow circuit 4.
Capacitor drive circuit 5 comprises diode D18, diode D19, relay J 1, relay J 2, triode Q2 and triode Q3, the negative pole of diode D18, the negative pole of diode D19, one end of relay J 1 coil, the one termination control power supply of relay J 2 coils, the positive pole of diode D18, the collector electrode of another termination triode Q2 of relay J 1 coil, the positive pole of diode D19, the collector electrode of another termination triode Q3 of relay J 2 coils, the normally-closed contact of relay J 1 and filter capacitor C6 are connected between the emitter of the negative pole of diode D7 and triode Q2, the normally-closed contact of relay J 2 and filter capacitor C7 are connected between the emitter of the negative pole of diode D7 and triode Q3, the emitter of triode Q2, the emitter of triode Q3 connects current detection circuit 6, the base stage of triode Q2, the base stage of triode Q3 connects single chip machine controlling circuit 7.
Microcontroller power supply comprises transformer T2, by diode D10, diode D11, rectifying full bridge and filter capacitor C8 that diode D12 and diode D13 form, the input termination power of rectifying full bridge, filter capacitor C8 is connected in parallel between the output and ground of rectifying full bridge, the output of the input termination rectifying full bridge of three terminal regulator U1, filter capacitor C17 connects the output of three terminal regulator U1, the output of the input termination three terminal regulator U1 of three terminal regulator U2, single-chip microcomputer U3 connects the output of three terminal regulator U2, three terminal regulator U1 is 7812, and three terminal regulator U2 is 7805.
Single chip machine controlling circuit 7 comprises single-chip microcomputer U3, and the output of single-chip microcomputer U3 connects the base stage of triode Q2 through resistance R 31, and another output of single-chip microcomputer U3 connects the base stage of triode Q3 through resistance R 32.
Current detection circuit 6 comprises resistance R 6 and diode D9, and an end of resistance R 6 and the negative pole of diode D9 meet respectively filter capacitor C6 and filter capacitor C7, and the positive pole of the other end of resistance R 6 and diode D9 connects pressure-stabilizing constant flow circuit 4;
As shown in Figure 2, PF correcting circuit 2 comprises integrated circuit U4, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, resistance R 15, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, capacitor C 9, capacitor C 10, capacitor C 11, capacitor C 12, triode Q4, triode Q5, triode Q6, triode Q7, voltage stabilizing didoe D14 and diode D15, and the model of integrated circuit U4 is SA7527.
One end ground connection of resistance R 7, the other end connects the base stage of triode Q4 and connects the positive pole of voltage stabilizing didoe D14 through resistance R 8, the collector electrode of triode Q4 connects capacitor C 9, one end of resistance R 9 also connects the base stage of triode Q5, the emitter of triode Q4, triode Q5 emitter, the other end ground connection of capacitor C 9, the collector electrode of another termination triode Q5 of resistance R 9 and through resistance R 10 connecting resistance R19, one end of capacitor C 12 also connects 2 pin of integrated circuit U4, resistance R 19,1 pin of another termination integrated circuit U2 of capacitor C 12 also connects the anodal of voltage stabilizing didoe D14 and connects the output of photoelectrical coupler OC through 5 pin of contact pin CN1 through resistance R 20, and the negative pole of voltage stabilizing didoe D14 connects 8 pin of integrated circuit U2 and connects another output of photoelectrical coupler OC through 6 pin of contact pin CN1;
The 3 pin connecting resistance R11 of integrated circuit U4, resistance R 17, one end of resistance R 18 and capacitor C 11, the other end of resistance R 11 is through the end of resistance R 13 connecting resistance R14 and connect the output of rectifying full bridge through 1 pin of contact pin CN1, the other end ground connection of resistance 17 and capacitor C 11 and through the collector electrode of resistance R 15 connecting resistance R12 and triode Q6, the other end of the other end connecting resistance R14 of resistance R 12, the collector electrode of another termination triode Q7 of resistance R 18, the base stage connecting resistance R16 of triode Q7, one end of capacitor C 10, the emitter of another termination triode Q6 of resistance R 16, the emitter of triode Q7, the other end ground connection of capacitor C 10;
4 pin of integrated circuit U4 connect the source S of field effect transistor Q1 through 3 pin of contact pin CN1, and 5 pin of integrated circuit U4 connect the positive pole of diode D6 through 4 pin of resistance R 21, contact pin CN1;
7 pin of integrated circuit U4 connect the negative pole of diode D15, an end of resistance R 22, and the other end of the positive pole of diode D15, resistance R 22 is through resistance R 23 ground connection.
As shown in Figure 3, pressure-stabilizing constant flow circuit 4 comprises integrated circuit U5, resistance R 24, resistance R 25, resistance R 26, resistance R 27, resistance R 28, resistance R 29, resistance R 30, capacitor C 13, capacitor C 14, capacitor C 15, capacitor C 16, diode D16 and diode D17, the model of integrated circuit U5 is AP4310,1 pin of integrated circuit U5 connects the negative pole of diode D16, one end of capacitor C 13, the positive pole of diode D16 connects the input of photoelectrical coupler OC through 6 pin of contact pin CN2, diode D17 anodal and through capacitor C 14 ground connection, 2 pin of another termination integrated circuit U5 of capacitor C 13, one end of resistance R 26 and through resistance R 24 ground connection, the other end of resistance R 26 connects the negative pole of diode D7 through 4 pin of contact pin CN2, the 3 pin connecting resistance R27 of integrated circuit U5, one end of resistance R 28,8 pin of another termination integrated circuit U5 of resistance R 27, the negative pole of diode D8, one end of resistance R 29 and through capacitor C 15 ground connection, the other end of resistance R 29 connects another input of photoelectrical coupler OC through 1 pin of contact pin CN2,8 pin of integrated circuit U5 connect the negative pole of diode D8 through 5 pin of contact pin CN2,6 pin of integrated circuit U5 connect capacitor C 16, one end of resistance R 30,7 pin of another termination integrated circuit U5 of capacitor C 16, the negative pole of diode D16, the other end of resistance R 30 connects the positive pole of diode D9 through 3 pin of contact pin CN2, and the resistance of resistance R 28 is 27K.
The 220V electric main obtains the direct voltage about 300V through rectification, filtering, and this direct voltage one tunnel is through the R1 step-down, enters 8 pin of integrated circuit U4 through 6 pin of contact pin CN1, and U4 provides starting resistor for integrated circuit.The second the tunnel is added to the drain electrode of field effect transistor Q1 through transformer T1 armature winding.Third Road is through the 1 pin resistance R 11 of contact pin CN1,3 pin that resistance R 13 is added to integrated circuit U4.Carrying out PF by the 3 pin internal multiplier of integrated circuit U4 proofreaies and correct.After 8 pin of integrated circuit U4 obtain starting resistor, start working, by 7 pin of integrated circuit U4 output widened pulse, be added to the grid of field effect transistor Q1 through 2 pin of contact pin CN2, field effect transistor Q1 enters switch working state.Electric current forms the loop through the D of primary winding, the field effect transistor Q1 utmost point, the S utmost point, resistance R 3 to ground.The auxiliary winding 3 pin output of transformer pulse obtains the 16V direct voltage through diode D6 rectification, capacitor C 13 filtering, and U4 provides operating voltage for integrated circuit, the pulse of integrated circuit U4 continuous wave output.Circuit enters the continuous firing state.Transformer secondary output 7 pin voltage pulse outputs, through diode D7 rectification, filter capacitor C6, filter capacitor C7 filtering obtain the 48V commutating voltage, are the LED power supply.Transformer secondary output 5 pin pulse voltages obtain the 16V direct voltage through D8 rectification, capacitor C 5 filtering, are 4 power supplies of pressure-stabilizing constant flow circuit.
Voltage through resistance R 24, resistance R 26 dividing potential drops, obtain a direct voltage that is directly proportional with output voltage, be added to 2 pin of integrated circuit U5, enter the reverse input end of inner amplifier 1.3 pin of integrated circuit U5 are the 2.5V reference voltage source.Be added to the in the same way input of inner amplifier 1.Amplifier 1 output error voltage connects the negative pole of photoelectrical coupler OC through diode D16, control its luminous intensity, thereby the conducting degree of the phototriode of control optocoupler inside, the phototriode emitter is through the 5 pin connecting resistance R20 of contact pin CN1, then connect 1 pin of integrated circuit U4, the width of pulse is exported in control, reaches the purpose of burning voltage.The circuit output current forms the loop through filter capacitor C6, filter capacitor C7 positive pole, LED load, resistance R 6 with the parallel circuits of diode D19.Circuit forms voltage drop in resistance R 4, be voltage with current conversion, this voltage is through 3 pin of contact pin CN2,6 pin that resistance R 6 is added to integrated circuit U5, this pin connects inner amplifier 2 reverse input ends, 5 pin connect in the same way input of inner amplifier 2, and 5 pin reference voltages are obtained after with 5V reference voltage dividing potential drop by R25, R28.The 7 pin output error voltages of integrated circuit U5 are added to optocoupler interior light emitting diodes negative pole through resistance D17.With with the 7 pin output pulse widths of the same approach integrated circuit U4 of voltage stabilizing process, reach the purpose of constant current.This circuit output current is 1A, and voltage can change between the 48V at 27V according to loading condition.Because the output electrochemical capacitor is fallible component, this circuit adopts single chip circuit 7 control relays to move in turn, makes in turn place in circuit of output filter capacitor, takes turns to operate, and effectively increases the service life.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; in order to make those skilled in the art can better understand the utility model content; should not be understood as the restriction to the utility model protection range; so long as the improvement of doing according to technical solutions of the utility model all falls into protection range of the present utility model.

Claims (5)

1. LED driving power PF correcting circuit, it is characterized in that: described PF correcting circuit comprises integrated circuit (U4), resistance (R7), resistance (R8), resistance (R9), resistance (R10), resistance (R11), resistance (R12), resistance (R13), resistance (R14), resistance (R15), resistance (R16), resistance (R17), resistance (R18), resistance (R19), resistance (R20), resistance (R21), resistance (R22), resistance (R23), electric capacity (C9), electric capacity (C10), electric capacity (C11), electric capacity (C12), triode (Q4), triode (Q5), triode (Q6), triode (Q7), voltage stabilizing didoe (D14) and diode (D15);
One end ground connection of resistance (R7), the other end connects the base stage of triode (Q4) and connects the positive pole of voltage stabilizing didoe (D14) through resistance (R8);
The collector electrode of triode (Q4) connects an end of electric capacity (C9), resistance (R9) and connects the base stage of triode (Q5);
The emitter of triode (Q4), triode (Q5) emitter, the other end ground connection of electric capacity (C9), the collector electrode of another termination triode (Q5) of resistance (R9) and through resistance (R10) connecting resistance (R19), one end of electric capacity (C12) also connects 2 pin of integrated circuit (U4), resistance (R19), 1 pin of another termination integrated circuit (U2) of electric capacity (C12) also connects the positive pole of voltage stabilizing didoe (D14) and an output of photoelectrical coupler (OC) through resistance (R20), and the negative pole of voltage stabilizing didoe (D14) connects 8 pin of integrated circuit (U2) and connects another output of photoelectrical coupler (OC).
2. a kind of LED driving power PF correcting circuit as claimed in claim 1 is characterized in that: an end of 3 pin connecting resistances (R11), resistance (R17), resistance (R18) and the electric capacity (C11) of described integrated circuit (U4);
The other end of resistance (R11) is through an end of resistance (R13) connecting resistance (R14) and connect the output of rectifying full bridge, the other end ground connection of resistance (R17) and electric capacity (C11) and through the collector electrode of resistance (R15) connecting resistance (R12) and triode (Q6), the other end of the other end connecting resistance (R14) of resistance (R12), the collector electrode of another termination triode (Q7) of resistance (R18).
3. a kind of LED driving power PF correcting circuit as claimed in claim 2, it is characterized in that: the base stage connecting resistance (R16) of described triode (Q7), an end of electric capacity (C10), the emitter of another termination triode (Q6) of resistance (R16), the other end ground connection of the emitter of triode (Q7), electric capacity (C10).
4. a kind of LED driving power PF correcting circuit as claimed in claim 3, it is characterized in that: 4 pin of described integrated circuit (U4) connect the source electrode (S) of field effect transistor (Q1), and 5 pin of integrated circuit (U4) connect the positive pole of diode (D6) through resistance (R21).
5. a kind of LED driving power PF correcting circuit as claimed in claim 4, it is characterized in that: 7 pin of described integrated circuit (U4) connect an end of the negative pole of diode (D15), resistance (R22), and the other end of the positive pole of diode (D15), resistance (R22) is through resistance (R23) ground connection.
CN 201220233559 2012-05-23 2012-05-23 PF (power factor) correcting circuit for LED driving power supply Expired - Fee Related CN202652621U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220233559 CN202652621U (en) 2012-05-23 2012-05-23 PF (power factor) correcting circuit for LED driving power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220233559 CN202652621U (en) 2012-05-23 2012-05-23 PF (power factor) correcting circuit for LED driving power supply

Publications (1)

Publication Number Publication Date
CN202652621U true CN202652621U (en) 2013-01-02

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Application Number Title Priority Date Filing Date
CN 201220233559 Expired - Fee Related CN202652621U (en) 2012-05-23 2012-05-23 PF (power factor) correcting circuit for LED driving power supply

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130102

Termination date: 20150523

EXPY Termination of patent right or utility model