CN202652073U - A switching power supply circuit capable of realizing output constant current control - Google Patents
A switching power supply circuit capable of realizing output constant current control Download PDFInfo
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- CN202652073U CN202652073U CN2012201296911U CN201220129691U CN202652073U CN 202652073 U CN202652073 U CN 202652073U CN 2012201296911 U CN2012201296911 U CN 2012201296911U CN 201220129691 U CN201220129691 U CN 201220129691U CN 202652073 U CN202652073 U CN 202652073U
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- 238000001914 filtration Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a switch power supply circuit capable of realizing output constant current control. The switch power supply circuit comprises a primary circuit, a secondary circuit, a transformer, a PWM control chip and a chip power supply circuit. The primary circuit and the secondary circuit are coupled through a primary coil and a first secondary coil of the transformer. An output end of the first secondary coil is connected with a secondary rectification filter circuit. The primary circuit comprises an inverter circuit driven by the PWM control chip. The inverter circuit comprises a resonant circuit and a switch circuit driven by the PWM control chip. The resonant circuit is connected with an output end of the switch circuit. The resonant circuit comprises the primary coil of the transformer, a resonant capacitor and a resonant inductor, wherein the primary coil of the transformer, the resonant capacitor and the resonant inductor are connected in series. The chip power supply circuit comprises a second secondary coil of the transformer, a first diode, a first auxiliary winding and a second diode. The first auxiliary winding is coupled with the resonant inductor. One end of the second secondary coil of the transformer is grounded, and the other end is connected with an anode of the first diode. A cathode of the first diode is connected with a power supply pin of the PWM control chip. One end of the first auxiliary winding is grounded, and the other end is connected with an anode of the second diode. A cathode of the second diode is connected with the cathode of the first diode. According to the utility model, full-range constant current control from 0V to an output rated voltage is realized.
Description
[technical field]
The utility model relates to Switching Power Supply, relates in particular to a kind of switching power circuit that can realize output constant current control.
[background technology]
Development along with switch power technology, because input harmonic current restriction, PFC (power factor correction, power factor correction) circuit becomes an indispensable part in the Switching Power Supply, and the volume requirement of Switching Power Supply is more and more less, therefore the chip of various integrated PFC and DC/DC function is developed, and use also more and more extensive, one of them typical example is the TEA1713 of NXP company, it is integrated the PFC function of CRM control and the DC/DC function of half-bridge logical link control (LLC) resonant conversion, the various occasions about power output is less than 300w are widely applied.
The DC of TEA1713 chip partly adopts half-bridge LLC control; under short circuit or constant current output state; operating frequency rises; the transformer primary side winding voltage reduces; the resonant inductance winding voltage but raises, and such as single transformer one road winding auxiliary power supply of getting, boost voltage will certainly decrease; finally can be lower than chip operating voltage, power protection can't be realized constant current output.
The integrated PFC of TEA1713 and LLC function; preferably efficient is provided; and various defencive functions are complete; if but need the power supply output-parallel; perhaps need output to carry out constant current control; so that in the output short-circuit situation; still can guarantee in the output current constant current situation; there are a lot of difficulties; method commonly used is to adopt independent accessory power supply to carry out stable power-supplying to control section to cause like this devices such as the magnetic that increases and switch; the volume of Switching Power Supply certainly will be increased, the trend requirement of Switching Power Supply miniaturization can't be realized.
[summary of the invention]
The technical problems to be solved in the utility model provides a kind of switching power circuit that does not need accessory power supply independently just can realize output constant current control.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of switching power circuit that can realize output constant current control, comprise former limit circuit, secondary circuit, transformer, pwm chip and chip power circuit, former limit circuit and secondary circuit are by primary coil and first level coil coupling of transformer, the output termination secondary current rectifying and wave filtering circuit of the first secondary coil; Former limit circuit comprises the inverter circuit that is driven by pwm chip, described inverter circuit comprises resonant circuit and the switching circuit that is driven by pwm chip, resonant circuit connects the output of switching circuit, and resonant circuit comprises the primary coil of the transformer of series connection, resonant capacitance and resonant inductance; The chip power circuit comprises transformer second subprime coil, the first diode, the first auxiliary winding and the second diode, the first auxiliary winding and resonant inductance coupling; One end ground connection of transformer second subprime coil, the anode of another termination the first diode, the negative electrode of the first diode connects the supply pin of pwm chip; One end ground connection of the first auxiliary winding, the anode of another termination the second diode, the negative electrode of the second diode connects the negative electrode of the first diode.
The above-described switching power circuit that can realize output constant current control, the chip power circuit comprises the first linear voltage-stabilizing circuit, the negative electrode of the first diode connects the supply pin of pwm chip by the first linear voltage-stabilizing circuit.
The above-described switching power circuit that can realize output constant current control, the first linear voltage-stabilizing circuit comprises the first triode, the first voltage-stabiliser tube, the first resistance, the first electric capacity and the second electric capacity, the collector electrode of the first triode connects the negative electrode of the first diode, emitter connects the supply pin of pwm chip, and base stage connects the negative electrode of the first voltage-stabiliser tube; The plus earth of the first voltage-stabiliser tube, the collector electrode of a termination first triode of the first electric capacity, other end ground connection; The emitter of one termination, first triode of the second electric capacity, other end ground connection; The base stage of one termination, first triode of the first resistance, the negative electrode of another termination the first diode.
The above-described switching power circuit that can realize output constant current control comprises current sampling circuit and amplifier power circuit, and current sampling circuit comprises sampling resistor, operational amplifier and optocoupler; The amplifier power circuit comprises transformer for the third time level coil, the 3rd diode, the second auxiliary winding and the 4th diode, the second auxiliary winding and resonant inductance coupling; Transformer is an end ground connection of level coil for the third time, and the anode of another termination the 3rd diode, the negative electrode of the 3rd diode connect the supply pin of operational amplifier and the anode of optocoupler light-emitting diode; One end ground connection of the second auxiliary winding, the anode of another termination the 4th diode, the negative electrode of the 4th diode connects the negative electrode of the 3rd diode.
The above-described switching power circuit that can realize output constant current control, the amplifier power circuit comprises the second linear voltage-stabilizing circuit, the negative electrode of the 3rd diode connects the supply pin of operational amplifier and the anode of optocoupler light-emitting diode by the second linear voltage-stabilizing circuit.
The above-described switching power circuit that can realize output constant current control, the second linear voltage-stabilizing circuit comprises the second triode, the second voltage-stabiliser tube, the 3rd resistance, the 3rd electric capacity and the 4th electric capacity, the collector electrode of the second triode connects the negative electrode of the 3rd diode, emitter connects the supply pin of operational amplifier and the anode of optocoupler light-emitting diode, and base stage connects the negative electrode of the second voltage-stabiliser tube; The plus earth of the second voltage-stabiliser tube, the collector electrode of a termination second triode of the 3rd electric capacity, other end ground connection; The emitter of one termination, second triode of the 4th electric capacity, other end ground connection; The base stage of one termination, second triode of the 3rd resistance, the negative electrode of another termination the 3rd diode.
The above-described switching power circuit that can realize output constant current control, current sampling resistor is connected between the negative pole of secondary current rectifying and wave filtering circuit negative pole and switching power circuit output; Secondary current rectifying and wave filtering circuit negative pole connects the input of operational amplifier, the negative electrode of output termination optocoupler light-emitting diode; The output termination pwm chip of optocoupler
The above-described switching power circuit that can realize output constant current control, described inverter circuit comprises the switching tube that two pwm chips drive, and adopts the resonance oscillation semi-bridge topological structure.
The above-described switching power circuit that can realize output constant current control, described pwm chip is the TEA1713 integrated circuit (IC) chip.
The utility model can realize that the switching power circuit of output constant current control is by getting No. one accessory power supply from resonant inductance, can guarantee in the output short-circuit situation, still can not guarantee the steady operation of chip by other independent power supply, thereby realize controlling from 0V to the constant current of output rated voltage gamut, the functions such as parallel operation, simplified circuit structure, had simply, efficiently advantage and wide application prospect.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the schematic diagram that the utility model can be realized the switching power circuit embodiment of output constant current control.
[embodiment]
The switching power circuit that the utility model embodiment can realize output constant current control comprises former limit circuit and secondary circuit as shown in Figure 1.Former limit circuit comprises the filter circuit of BRG1 rectifier bridge, inductance L 2, capacitor C 1, C5 composition and the BOOST booster circuit that inductance L 4-A, switching tube Q8, diode D17, resistance R 11 and capacitor C 21 form, the inverter circuit that switching tube Q1, Q3, resonant capacitance C50, resonant inductance L1-A and transformer T1-A consist of.The BOOST booster circuit provides direct current to inverter circuit.
Secondary circuit comprises secondary coil T1-D and T1-E, and rectifier diode D3, D4 and capacitor C 13 form current rectifying and wave filtering circuit, the output termination current rectifying and wave filtering circuit of secondary coil T1-D and T1-E.Former limit circuit and secondary circuit are by primary coil T1-A and secondary coil T1-D and T1-E coupling.
Inverter circuit adopts the resonance oscillation semi-bridge topological structure, the resonant circuit that output termination resonant capacitance C50, the resonant inductance L1-A of the half-bridge switch circuit that switching tube Q1, Q3 consist of and transformer T1-A series connection consist of.Switching tube Q1, Q3 are driven by pwm chip TEA1713 (IC1).
The chip power circuit comprises transformer second subprime coil T1-B, diode D1, auxiliary winding L 1-B and diode D2, auxiliary winding L 1-B and resonant inductance L1-A coupling; The end ground connection of transformer second subprime coil T1-B, the anode of another terminating diode D1, the negative electrode of diode D1 connect the supply pin of pwm chip TEA1713 (IC1) by the first linear voltage-stabilizing circuit; The end ground connection of auxiliary winding L 1-B, the anode of another terminating diode D2, the negative electrode of diode D2 connects the negative electrode of diode D1.
The first linear voltage-stabilizing circuit comprises triode Q4, voltage-stabiliser tube Z4, resistance R 80, capacitor C 20 and capacitor C 4, the collector electrode of triode Q4 connects the negative electrode of diode D1, emitter connects the supply pin of pwm chip TEA1713 (IC1), and base stage connects the negative electrode of voltage-stabiliser tube Z4; The plus earth of voltage-stabiliser tube Z4, the collector electrode of a termination triode Q4 of capacitor C 20, other end ground connection; The emitter of one termination triode Q4 of capacitor C 4, other end ground connection; The base stage of one termination triode Q4 of resistance R 80, the negative electrode of another terminating diode D1.
Current sampling circuit comprises sampling resistor R2, operational amplifier U1-A and optocoupler OT1; The amplifier power circuit comprises transformer for the third time level coil T1-C, diode D10, auxiliary winding L 1-C and diode D5, auxiliary winding L 1-C and resonant inductance L1-A coupling; Transformer is the end ground connection of level coil T1-C for the third time, the anode of another terminating diode D10, and the negative electrode of diode D10 connects the supply pin of operational amplifier U1-A and the anode of optocoupler light-emitting diode OT1-B by the second linear voltage-stabilizing circuit; The end ground connection of auxiliary winding L 1-C, the anode of another terminating diode D5, the negative electrode of diode D5 connects the negative electrode of diode D10.
Current sampling resistor R2 is connected between the negative pole AGND of secondary current rectifying and wave filtering circuit negative pole and switching power circuit output; The negative pole of secondary current rectifying and wave filtering circuit output connects the input of operational amplifier U1-A, the negative electrode of the output termination optocoupler light-emitting diode OT1-B of operational amplifier U1-A; The output OT1-A of optocoupler meets pwm chip TEA1713 (IC1).
The second linear voltage-stabilizing circuit comprises triode Q2, voltage-stabiliser tube Z1, resistance R 3, capacitor C 2 and capacitor C 3, the collector electrode of triode Q2 connects the negative electrode of diode D10, emitter connects the supply pin of operational amplifier U1-A and the anode of optocoupler light-emitting diode OT1-B, and base stage connects the negative electrode of voltage-stabiliser tube Z1; The plus earth of voltage-stabiliser tube Z1, the collector electrode of a termination triode Q2 of capacitor C 2, other end ground connection; The emitter of one termination triode Q2 of capacitor C 3, other end ground connection; The base stage of one termination triode Q2 of resistance R 3, the negative electrode of another terminating diode D10.
Method of the present invention is utilized the characteristics of PFC+ resonance oscillation semi-bridge scheme control chip (TEA1713) and resonance half-bridge circuit, and output constant current when control keeps boost voltage and can not continue to reduce and cause chip to quit work.
In the circuit of former limit, secondary coil T1-B, diode D1 are as the auxiliary power supply branch road of Transformer Winding, and auxiliary winding L 1-B and diode D2 are as the auxiliary power supply branch road of resonant inductance winding.When the output voltage that will work as switching circuit drops to 0V, still can there be enough VCC to keep main control chip (TEA1713) work, then at T1-B, the D1 branch road is because when VO lower voltage and lower voltage, by L1-B, the D2 branch road provides voltage, keeps the normal operation of master control IC (TEA1713), for avoiding the overtension defective chip, triode Q4, voltage-stabiliser tube Z4 are the linear voltage stabilization circuit.
Secondary circuit is by sealing in current sampling resistor R2 in output loop, the error signal that sampling current signal and reference signal VREF obtain by amplifier U1-A more afterwards, feed back to master control IC (TEA1713) by optocoupler, thereby the control output current is realized output constant current control; As the power supply of the error amplifier of primary side, if directly get from output voltage VO, then can run into as VO since constant current output and lower voltage when being lower than the minimum operating voltage of amplifier, the constant current control loop quits work.At transformer secondary output, need an independent boost voltage VDD to come to error amplifier and optocoupler power supply, in like manner, can respectively get one road winding from transformer and resonant inductance, secondary coil T1-C, diode D10 and auxiliary winding L 1-C and diode D5 come to power to VDD, then at T1-C, the D10 branch road is because when VO lower voltage and lower voltage, by L1-C, the D5 branch road provides voltage, keep the normal operation of error amplifier and optocoupler, for avoiding the overtension defective chip, triode Q2, voltage-stabiliser tube Z1 consist of the linear voltage stabilization circuit.
Can adopt the principle analysis of above control method as follows: owing to adopt the resonance oscillation semi-bridge topological structure, from principle analysis, when output constant current is controlled, output voltage reduces output current and remains unchanged, and power output reduces, and then the transducer operating frequency raises, the transformer primary side winding voltage reduces, cause transformer to assist winding T1-B, D1 and T1-C, the D10 branch voltage reduces, but the voltage of resonant inductance winding can raise, auxiliary winding L 1-B, D2 and L1-C, the D5 branch voltage raises.When the D1/D10 branch voltage is higher than the D2/D5 branch road, provide energy to power supply by D1/D10.When the D2/D5 branch voltage was higher than the D1/D10 branch voltage, D2/D5 provided energy to power supply.In the whole course of work, be not less than all the time the minimum operating voltage of primary and secondary control circuit as long as guarantee D1/D10 and D2/D5 two-way superimposed voltage, just can guarantee that power-supply system works in the whole constant current process that VO is low to moderate 0V, does not turn-off.
As mentioned above, owing to having adopted to get auxiliary winding and get auxiliary winding superimposed voltage from transformer from resonant inductance VCC/VDD be provided, do not need to set up separately again accessory power supply VCC/VDD is provided, and well avoided the VCC/VDD problem that voltage can reduce when constant current is controlled, increase simultaneously the safety that the linear voltage stabilization circuit guarantees circuit, avoid overtension to damage device.Well embodied circuit simple, volume is little, and reliability is high, the characteristics that efficient is high.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201296911U CN202652073U (en) | 2012-03-31 | 2012-03-31 | A switching power supply circuit capable of realizing output constant current control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201296911U CN202652073U (en) | 2012-03-31 | 2012-03-31 | A switching power supply circuit capable of realizing output constant current control |
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| CN202652073U true CN202652073U (en) | 2013-01-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462909A (en) * | 2018-09-11 | 2019-03-12 | 杭州电子科技大学 | A kind of primary side constant-current control device and compensating current signal extracting method |
| CN109788603A (en) * | 2017-11-15 | 2019-05-21 | 广东金莱特电器股份有限公司 | Power circuit and its lighting apparatus |
| CN109980901A (en) * | 2019-03-05 | 2019-07-05 | 合肥华耀电子工业有限公司 | A kind of auxiliary power supply circuit of wide input range power module |
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
| CN117040289A (en) * | 2023-10-09 | 2023-11-10 | 广东欧曼科技股份有限公司 | High-efficiency LLC resonant power supply front-stage constant current system and control method |
-
2012
- 2012-03-31 CN CN2012201296911U patent/CN202652073U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109788603A (en) * | 2017-11-15 | 2019-05-21 | 广东金莱特电器股份有限公司 | Power circuit and its lighting apparatus |
| CN109788603B (en) * | 2017-11-15 | 2024-03-15 | 广东金莱特电器股份有限公司 | Power supply circuit and lighting equipment thereof |
| CN109462909A (en) * | 2018-09-11 | 2019-03-12 | 杭州电子科技大学 | A kind of primary side constant-current control device and compensating current signal extracting method |
| CN109462909B (en) * | 2018-09-11 | 2023-11-17 | 杭州电子科技大学 | Primary side constant current control device and compensation current signal extraction method |
| CN109980901A (en) * | 2019-03-05 | 2019-07-05 | 合肥华耀电子工业有限公司 | A kind of auxiliary power supply circuit of wide input range power module |
| CN109980901B (en) * | 2019-03-05 | 2021-06-15 | 合肥华耀电子工业有限公司 | Auxiliary power supply circuit of wide input range power module |
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
| CN117040289A (en) * | 2023-10-09 | 2023-11-10 | 广东欧曼科技股份有限公司 | High-efficiency LLC resonant power supply front-stage constant current system and control method |
| CN117040289B (en) * | 2023-10-09 | 2024-02-13 | 广东欧曼科技股份有限公司 | High-efficiency LLC resonant power supply front-stage constant current system and control method |
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