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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
circuit
diode
power supply
cathode
constant current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2012201296911U
Other languages
Chinese (zh)
Inventor
阮世良
臧恒勇
程捷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Gospell Electric Technology Co Ltd
Original Assignee
Shenzhen Gospell Electric Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Gospell Electric Technology Co Ltd filed Critical Shenzhen Gospell Electric Technology Co Ltd
Priority to CN2012201296911U priority Critical patent/CN202652073U/en
Application granted granted Critical
Publication of CN202652073U publication Critical patent/CN202652073U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Landscapes

  • Dc-Dc Converters (AREA)

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

A kind of switching power circuit that can realize output constant current control
[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.

Claims (9)

1.一种能实现输出恒流控制的开关电源电路,其特征在于,包括原边电路、副边电路、变压器、PWM控制芯片和芯片电源电路,原边电路和副边电路通过变压器的初级线圈和第一次级线圈耦合,第一次级线圈的输出端接副边整流滤波电路;原边电路包括由PWM控制芯片驱动的逆变电路,所述的逆变电路包括谐振电路和由PWM控制芯片驱动的开关电路,谐振电路接开关电路的输出端,谐振电路包括串联的变压器的初级线圈,谐振电容和谐振电感;芯片电源电路包括变压器第二次级线圈、第一二极管、第一辅助绕组和第二二极管,第一辅助绕组与谐振电感耦合;变压器第二次级线圈的一端接地,另一端接第一二极管的阳极,第一二极管的阴极接PWM控制芯片的电源脚;第一辅助绕组的一端接地,另一端接第二二极管的阳极,第二二极管的阴极接第一二极管的阴极。 1. A switching power supply circuit that can realize output constant current control, is characterized in that, comprises primary side circuit, secondary side circuit, transformer, PWM control chip and chip power supply circuit, primary side circuit and secondary side circuit pass through the primary coil of transformer Coupled with the first secondary coil, the output terminal of the first secondary coil is connected to the secondary side rectification filter circuit; the primary side circuit includes an inverter circuit driven by a PWM control chip, and the inverter circuit includes a resonant circuit and is controlled by PWM The switch circuit driven by the chip, the resonant circuit is connected to the output end of the switch circuit, the resonant circuit includes the primary coil of the transformer connected in series, the resonant capacitor and the resonant inductance; the chip power supply circuit includes the second secondary coil of the transformer, the first diode, the first The auxiliary winding and the second diode, the first auxiliary winding is coupled with the resonant inductance; one end of the second secondary coil of the transformer is grounded, the other end is connected to the anode of the first diode, and the cathode of the first diode is connected to the PWM control chip One end of the first auxiliary winding is grounded, the other end is connected to the anode of the second diode, and the cathode of the second diode is connected to the cathode of the first diode. 2.根据权利要求1所述的能实现输出恒流控制的开关电源电路,其特征在于,芯片电源电路包括第一线性稳压电路,第一二极管的阴极通过第一线性稳压电路接PWM控制芯片的电源脚。 2. The switching power supply circuit capable of realizing output constant current control according to claim 1, wherein the chip power supply circuit comprises a first linear voltage stabilizing circuit, and the cathode of the first diode is connected to the first linear voltage stabilizing circuit. The power pin of the PWM control chip. 3.根据权利要求2所述的能实现输出恒流控制的开关电源电路,其特征在于,第一线性稳压电路包括第一三极管、第一稳压管、第一电阻、第一电容和第二电容,第一三极管的集电极接第一二极管的阴极,发射极接PWM控制芯片的电源脚,基极接第一稳压管的阴极;第一稳压管的阳极接地,第一电容的一端接第一三极管的集电极,另一端接地;第二电容的一端接第一三极管的发射极,另一端接地;第一电阻的一端接第一三极管的基极,另一端接第一二极管的阴极。 3. The switching power supply circuit capable of realizing output constant current control according to claim 2, wherein the first linear voltage regulator circuit comprises a first triode, a first voltage regulator tube, a first resistor, a first capacitor And the second capacitor, the collector of the first triode is connected to the cathode of the first diode, the emitter is connected to the power supply pin of the PWM control chip, and the base is connected to the cathode of the first voltage regulator; the anode of the first voltage regulator One end of the first capacitor is connected to the collector of the first triode, and the other end is grounded; one end of the second capacitor is connected to the emitter of the first triode, and the other end is grounded; one end of the first resistor is connected to the first triode The base of the tube, and the other end is connected to the cathode of the first diode. 4.根据权利要求1所述的能实现输出恒流控制的开关电源电路,其特征在于,包括电流采样电路和运放电源电路,电流采样电路包括采样电阻,运算放 大器和光耦;运放电源电路包括变压器第三次级线圈、第三二极管、第二辅助绕组和第四二极管,第二辅助绕组与谐振电感耦合;变压器第三次级线圈的一端接地,另一端接第三二极管的阳极,第三二极管的阴极接运算放大器的电源脚和光耦发光二极管的阳极;第二辅助绕组的一端接地,另一端接第四二极管的阳极,第四二极管的阴极接第三二极管的阴极。 4. the switching power supply circuit that can realize output constant current control according to claim 1, is characterized in that, comprises current sampling circuit and operational amplifier power supply circuit, and current sampling circuit comprises sampling resistance, operational amplifier and optocoupler; The power supply circuit includes the third secondary coil of the transformer, the third diode, the second auxiliary winding and the fourth diode, and the second auxiliary winding is coupled with the resonant inductance; one end of the third secondary coil of the transformer is grounded, and the other end is connected to the first The anode of the three diodes, the cathode of the third diode is connected to the power supply pin of the operational amplifier and the anode of the optocoupler LED; one end of the second auxiliary winding is grounded, the other end is connected to the anode of the fourth diode, and the fourth diode The cathode of the tube is connected to the cathode of the third diode. 5.根据权利要求4所述的能实现输出恒流控制的开关电源电路,其特征在于,运放电源电路包括第二线性稳压电路,第三二极管的阴极通过第二线性稳压电路接运算放大器的电源脚和光耦发光二极管的阳极。 5. The switching power supply circuit capable of realizing output constant current control according to claim 4, wherein the operational amplifier power supply circuit comprises a second linear voltage stabilizing circuit, and the cathode of the third diode passes through the second linear voltage stabilizing circuit Connect the power supply pin of the operational amplifier and the anode of the optocoupler LED. 6.根据权利要求5所述的能实现输出恒流控制的开关电源电路,其特征在于,第二线性稳压电路包括第二三极管、第二稳压管、第三电阻、第三电容和第四电容,第二三极管的集电极接第三二极管的阴极,发射极接运算放大器的电源脚和光耦发光二极管的阳极,基极接第二稳压管的阴极;第二稳压管的阳极接地,第三电容的一端接第二三极管的集电极,另一端接地;第四电容的一端接第二三极管的发射极,另一端接地;第三电阻的一端接第二三极管的基极,另一端接第三二极管的阴极。 6. The switching power supply circuit capable of realizing output constant current control according to claim 5, wherein the second linear voltage regulator circuit comprises a second triode, a second voltage regulator tube, a third resistor, and a third capacitor and the fourth capacitor, the collector of the second triode is connected to the cathode of the third diode, the emitter is connected to the power supply pin of the operational amplifier and the anode of the optocoupler light-emitting diode, and the base is connected to the cathode of the second voltage regulator tube; the second The anode of the Zener tube is grounded, one end of the third capacitor is connected to the collector of the second triode, and the other end is grounded; one end of the fourth capacitor is connected to the emitter of the second triode, and the other end is grounded; one end of the third resistor Connect to the base of the second triode, and the other end to the cathode of the third diode. 7.根据权利要求4所述的能实现输出恒流控制的开关电源电路,其特征在于,所述的采样电阻接在副边整流滤波电路负极和开关电源电路输出端的负极之间;副边整流滤波电路负极接运算放大器的输入端,输出端接光耦发光二极管的阴极;光耦的输出端接PWM控制芯片。 7. The switching power supply circuit capable of realizing output constant current control according to claim 4, wherein the sampling resistor is connected between the negative pole of the secondary rectification filter circuit and the negative pole of the output terminal of the switching power supply circuit; The negative pole of the filter circuit is connected to the input terminal of the operational amplifier, and the output terminal is connected to the cathode of the light-emitting diode of the optocoupler; the output terminal of the optocoupler is connected to the PWM control chip. 8.根据权利要求1至7中任一权利要求所述的能实现输出恒流控制的开关电源电路,其特征在于,所述的逆变电路包括两个PWM控制芯片驱动的开关管,采用谐振半桥拓扑结构。 8. The switching power supply circuit capable of realizing output constant current control according to any one of claims 1 to 7, wherein the inverter circuit includes two switching tubes driven by PWM control chips, and adopts resonance Half bridge topology. 9.根据权利要求1至7中任一权利要求所述的能实现输出恒流控制的开关 电源电路,其特征在于,所述的PWM控制芯片为TEA1713集成电路芯片。  9. The switching power supply circuit capable of outputting constant current control according to any one of claims 1 to 7, wherein said PWM control chip is a TEA1713 integrated circuit chip. the
CN2012201296911U 2012-03-31 2012-03-31 A switching power supply circuit capable of realizing output constant current control Expired - Fee Related CN202652073U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012201296911U CN202652073U (en) 2012-03-31 2012-03-31 A switching power supply circuit capable of realizing output constant current control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012201296911U CN202652073U (en) 2012-03-31 2012-03-31 A switching power supply circuit capable of realizing output constant current control

Publications (1)

Publication Number Publication Date
CN202652073U true CN202652073U (en) 2013-01-02

Family

ID=47421108

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012201296911U Expired - Fee Related CN202652073U (en) 2012-03-31 2012-03-31 A switching power supply circuit capable of realizing output constant current control

Country Status (1)

Country Link
CN (1) CN202652073U (en)

Cited By (5)

* Cited by examiner, † Cited by third party
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

Cited By (9)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN101801136B (en) High-efficiency LED constant current driving circuit
CN102056363B (en) LED power driving circuit
CN101834541B (en) Constant current circuit with high power factor
CN102263515B (en) AC-DC (alternating current-direct current) power conversion chip and power conversion circuit
CN203536942U (en) A novel ring choke converter output overvoltage protection circuit
CN110708820B (en) LED constant current drive circuit controlled through LLC resonance
CN202652073U (en) A switching power supply circuit capable of realizing output constant current control
CN103025009B (en) A kind of LED Drive and Control Circuit
CN109661072A (en) LLC resonant converter, LED drive circuit and its control method
CN103379701B (en) A kind of LED drive circuit and LED lamp
CN207910694U (en) A kind of multichannel and adjustable mixing output switching electric power source device
CN103401428B (en) Switch power supply control chip and switch power supply control system
CN201054545Y (en) Middle power multi-channel output thin switch power supply
CN207218539U (en) A double-transistor forward constant current power supply
CN204948393U (en) The LED drive circuit that a kind of stability is high
CN105792438A (en) A step-down single-stage LED drive circuit with unity power factor
CN103068129A (en) A LED drive power supply
CN104981078A (en) LED music lamp based on Bluetooth control
CN102969910A (en) Switching power supply control chip and application circuit thereof
CN203590560U (en) LED drive circuit and LED lamp
CN203278658U (en) switching power supply circuit
CN101969723B (en) A two-stage LED driver circuit without optocoupler with high power factor
CN217824726U (en) A single-stage PFC power supply circuit
CN204721240U (en) Switching power supply circuit
CN103687203B (en) A kind of LED drive circuit and LED lamp

Legal Events

Date Code Title Description
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: 20200331

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