CN202652620U - Voltage stabilizing constant current circuit for LED drive power supply - Google Patents
Voltage stabilizing constant current circuit for LED drive power supply Download PDFInfo
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- CN202652620U CN202652620U CN 201220233460 CN201220233460U CN202652620U CN 202652620 U CN202652620 U CN 202652620U CN 201220233460 CN201220233460 CN 201220233460 CN 201220233460 U CN201220233460 U CN 201220233460U CN 202652620 U CN202652620 U CN 202652620U
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Abstract
The utility model relates to a voltage stabilizing constant current circuit for an LED drive power supply, comprising an integrated circuit U5, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a diode D16 and a diode D17, wherein the pin 1 of the integrated circuit U5 is connected with the negative electrode of the diode D16 and one end of the capacitor C13, the positive electrode of the diode D16 is connected with one input end of an optical coupler (OC) and the positive electrode of the diode D17 and then grounded via the capacitor C14, the resistance value of the resistor R28 is 27K, and the model of the integrated circuit U5 is AP4310. The voltage stabilizing constant current circuit for an LED drive power supply is stable in output voltage, constant in current and higher in constant current control accuracy, and enables the current to be stable at a value of 1A, thereby being better in constant current effect.
Description
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 pressure-stabilizing constant flow 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, and is 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 brought up to 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 pressure-stabilizing constant flow circuit is provided, overcome in the prior art the low defective of constant current control accuracy in the driving power, after adopting described LED driving power with the pressure-stabilizing constant flow circuit, the constant current control accuracy is higher.
For solving above technical problem, the utility model is by the following technical solutions: a kind of LED driving power pressure-stabilizing constant flow circuit is characterized in that: described pressure-stabilizing constant flow circuit 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;
1 pin of integrated circuit U5 connects the negative pole of diode D16, an end of capacitor C 13, and the positive pole of diode D16 connects an input, diode D17 anodal of photoelectrical coupler OC and through capacitor C 14 ground connection.
A kind of prioritization scheme, 2 pin of another termination integrated circuit U5 of capacitor C 13, an end of resistance R 26 and through resistance R 24 ground connection, the negative pole of another terminating diode D7 of resistance R 26, the 3 pin connecting resistance R27 of integrated circuit U5, an end of resistance R 28.
Another kind of prioritization scheme, an end of 8 pin of another termination integrated circuit U5 of resistance R 27, the negative pole of diode D8, resistance R 29 and through capacitor C 15 ground connection, another input of another termination photoelectrical coupler OC of resistance R 29.
Another prioritization scheme, 6 pin of integrated circuit U5 connect an end of capacitor C 16, resistance R 30,7 pin of another termination integrated circuit U5 of capacitor C 16, the negative pole of diode D16, the positive pole of another terminating diode D9 of resistance R 30.
Further prioritization scheme, the resistance of described resistance R 28 is 27K.
Prioritization scheme further, the model of described integrated circuit U5 is AP4310.
After the utility model adopts above technical scheme, compared with prior art, have the following advantages: the integrated circuit U5 of pressure-stabilizing constant flow circuit adopts AP4310, make output voltage stabilization, current constant, the constant current control accuracy is higher, changes R28 into 27K by original 33K, with the electric current accurate stable at 1A, therefore the constant current better effects if.
Below in conjunction with drawings and Examples the utility model is elaborated.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams 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
Current rectifying and wave filtering circuit 1 converts the 220V electric main to the 300V direct current;
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;
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.
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.
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 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, 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 CN1,5 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, 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 enters 8 pin of integrated circuit U4 through the R1 step-down 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 the 7 pin output widened pulse of integrated circuit U4, 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 RR20 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 the parallel circuits of filter capacitor C6, filter capacitor C7 positive pole, LED load, resistance R R6 and diode D19.Circuit forms voltage drop at resistance R R4, be voltage with current conversion, this voltage is added to 6 pin of integrated circuit U5 through 3 pin, the resistance R R6 of contact pin CN2, 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 R 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 (6)
1. LED driving power pressure-stabilizing constant flow circuit, it is characterized in that: described pressure-stabilizing constant flow circuit (4) comprises integrated circuit (U5), resistance (R24), resistance (R25), resistance (R26), resistance (R27), resistance (R28), resistance (R29), resistance (R30), electric capacity (C13), electric capacity (C14), electric capacity (C15), electric capacity (C16), diode (D16) and diode (D17);
1 pin of integrated circuit (U5) connects the negative pole of diode (D16), an end of electric capacity (C13), and the positive pole of diode (D16) connects an input, diode (D17) anodal of photoelectrical coupler (OC) and through electric capacity (C14) ground connection.
2. a kind of LED driving power pressure-stabilizing constant flow circuit as claimed in claim 1, it is characterized in that: 2 pin of another termination integrated circuit (U5) of described electric capacity (C13), an end of resistance (R26) and through resistance (R24) ground connection, the negative pole of another terminating diode (D7) of resistance (R26), 3 pin connecting resistances (R27) of integrated circuit (U5), an end of resistance (R28).
3. a kind of LED driving power pressure-stabilizing constant flow circuit as claimed in claim 2, it is characterized in that: an end of 8 pin of another termination integrated circuit (U5) of described resistance (R27), the negative pole of diode (D8), resistance (R29) and through electric capacity (C15) ground connection, another input of another termination photoelectrical coupler (OC) of resistance (R29).
4. a kind of LED driving power pressure-stabilizing constant flow circuit as claimed in claim 3, it is characterized in that: 6 pin of described integrated circuit (U5) connect an end of electric capacity (C16), resistance (R30), 7 pin of another termination integrated circuit (U5) of electric capacity (C16), the negative pole of diode (D16), the positive pole of another terminating diode (D9) of resistance (R30).
5. such as one of them described a kind of LED driving power pressure-stabilizing constant flow circuit of claim 1-4, it is characterized in that: the resistance of described resistance (R28) is 27K.
6. such as one of them described a kind of LED driving power pressure-stabilizing constant flow circuit of claim 1-4, it is characterized in that: the model of described integrated circuit (U5) is AP4310.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220233460 CN202652620U (en) | 2012-05-23 | 2012-05-23 | Voltage stabilizing constant current circuit for LED drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220233460 CN202652620U (en) | 2012-05-23 | 2012-05-23 | Voltage stabilizing constant current circuit for LED drive power supply |
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| Publication Number | Publication Date |
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| CN202652620U true CN202652620U (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220233460 Expired - Fee Related CN202652620U (en) | 2012-05-23 | 2012-05-23 | Voltage stabilizing constant current circuit for LED drive power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768299A (en) * | 2015-04-04 | 2015-07-08 | 尉人杰 | Output short circuit protection type constant-current power supply |
| CN104768298A (en) * | 2015-04-04 | 2015-07-08 | 尉人杰 | Input undervoltage protection type constant-current power supply |
| CN104768300A (en) * | 2015-04-04 | 2015-07-08 | 郑继鑫 | Overheating protection type constant-current power supply |
-
2012
- 2012-05-23 CN CN 201220233460 patent/CN202652620U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768299A (en) * | 2015-04-04 | 2015-07-08 | 尉人杰 | Output short circuit protection type constant-current power supply |
| CN104768298A (en) * | 2015-04-04 | 2015-07-08 | 尉人杰 | Input undervoltage protection type constant-current power supply |
| CN104768300A (en) * | 2015-04-04 | 2015-07-08 | 郑继鑫 | Overheating protection type constant-current power supply |
| CN104768299B (en) * | 2015-04-04 | 2017-02-22 | 尉人杰 | Output short circuit protection type constant-current power supply |
| CN104768300B (en) * | 2015-04-04 | 2017-02-22 | 郑继鑫 | Overheating protection type constant-current power supply |
| CN104768298B (en) * | 2015-04-04 | 2017-05-03 | 深圳市聚多能科技股份有限公司 | Input undervoltage protection type constant-current power supply |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20150523 |
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| EXPY | Termination of patent right or utility model |