CN201414084Y - Switch power supply based on quasi-resonance - Google Patents
Switch power supply based on quasi-resonance Download PDFInfo
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- CN201414084Y CN201414084Y CN2009201359853U CN200920135985U CN201414084Y CN 201414084 Y CN201414084 Y CN 201414084Y CN 2009201359853 U CN2009201359853 U CN 2009201359853U CN 200920135985 U CN200920135985 U CN 200920135985U CN 201414084 Y CN201414084 Y CN 201414084Y
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Abstract
The utility model discloses a switch power supply based on quasi-resonance, which comprises a power input end, a transformer and a switch circuit, wherein the transformer comprises an input winding which is connected with the power input end, an output winding which is connected with an external load and an auxiliary winding which is connected with the switch circuit, the switch circuit comprisesa switch control circuit and a switch tube, and the switch tube is connected with the input winding in series. The switch control circuit adopts a PWM chip, the PWM chip is provided with a power inputport which is connected with a power end, and the input winding of the transformer is connected with an RC absorption circuit in parallel. The utility model utilizes principles of quasi-resonance flyback switch transducers, and an excess voltage protection circuit, a feedback compensation circuit and a DC/DC transducer with 500k switch frequency are added, which can effectively improve reliability of the switch power supply and input ranges of voltage, reduces EMI, and lowers loss, the structural size is reduced, and the switch power supply based on quasi-resonance is especially suitable forbeing applied in working environment of transducers.
Description
Technical field
The utility model relates to a kind of Switching Power Supply, and specifically a kind of Switching Power Supply based on quasi-resonance goes for industrial application such as frequency converter.
Background technology
Switching Power Supply of the prior art exists the output way many, bad easily, disturbs greatly, and efficient is hanged down problem.Especially be applied to Switching Power Supply on the frequency converter, when driving voltage breaks down, can cause that power I GBT device bursts.Frequency converter is big in input power network fluctuation scope, and when perhaps motor slowed down, DC bus-bar voltage can be up to more than the 800v.So require the Switching Power Supply operating voltage between 100～1000v direct current.Common Switching Power Supply adopts fixed switching frequency PWM control, and it is low to be operated in hard switching pattern efficient, and EMI (electromagnetic interference) is big, and driving pulse is too narrow when high voltage is imported loses, and during output short-circuit, other road output voltage can raise, and can not in time protect problem.
The utility model content
The purpose of this utility model is to provide a kind of Switching Power Supply based on quasi-resonance for overcoming the deficiencies in the prior art, can reduce EMI, reduces switching loss, has improved overvoltage, overcurrent protection reliability.
The utility model technology contents is: a kind of Switching Power Supply based on quasi-resonance, its feature comprises power input, transformer, switching circuit, and described transformer comprises the input winding that connects with power input, the output winding that connects with external loading and the auxiliary winding that connects with switching circuit; Described switching circuit comprises ON-OFF control circuit and switching tube; Described switching tube and input windings in series.
Further technology contents of the present utility model is: described ON-OFF control circuit is the PWM chip, and described PWM chip is provided with the power supply input port and connects with power end; The input winding of described transformer is parallel with RC and absorbs circuit.
Further technology contents of the present utility model is: the power supply input port of described ON-OFF control circuit also is in series with start-up circuit.
Further technology contents of the present utility model is: also be provided with the feedback compensation circuit, described feedback compensation circuit is provided with and exports input that winding connects and the output that connects with ON-OFF control circuit.
Further technology contents of the present utility model is: also be provided with excess voltage protection, described excess voltage protection is provided with and exports input that winding connects and the output that connects with ON-OFF control circuit.
Further technology contents of the present utility model is: described output winding is some groups, and wherein one group also is connected with the DC/DC converter.
Further technology contents of the present utility model is: described output winding comprises four groups of load output windings that are used to drive frequency converter IGBT assembly; Also comprise the fan winding that is used to drive the frequency converter fan; Be used to connect the multi-segment voltage supply winding of Frequency Converter Control plate.
Further technology contents of the present utility model is: described PWM chip is the L6565 cake core, and described DC/DC converter is the AOZ1010 cake core.
Further technology contents of the present utility model is: described fan winding is located at the same side with the input winding.
Further technology contents of the present utility model is: adopt the copper-clad line to connect the earth between described transformer input winding and the output winding and isolate, the magnetic core of described transformer adopts ETD39, and skeleton adopts 44 pin, and spacing is 2.5mm.
The utility model beneficial effect compared with prior art is: the utility model utilizes the principle of quasi-resonance formula flyback switching converter; and have additional the DC/DC converter of excess voltage protection, feedback compensation circuit and 500k switching frequency; can improve the reliable property of Switching Power Supply, input voltage range effectively; reduce EMI; reduce the wastage; physical dimension is dwindled, and is particularly suitable for being applied to the operational environment of frequency converter.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 a portion is the quasi-resonance formula inverse excitation type converter schematic diagram that the utility model adopts;
B portion is switch tube voltage Vds and contrasts oscillogram switching time;
Fig. 2 a portion is the EMI test resolution of PWM correspondence of the fixed switching frequency of traditional usefulness;
B portion is the EMI test resolution of the resonant mode converter correspondence of the utility model;
Fig. 3 is that a kind of Switching Power Supply based on quasi-resonance of the utility model specifically is implemented on the circuit block diagram in the Frequency Converter Control;
Fig. 4 is that a kind of Switching Power Supply based on quasi-resonance of the utility model specifically is implemented on the circuit theory diagrams in the Frequency Converter Control;
Fig. 5 is the I portion enlarged drawing among Fig. 4;
Fig. 6 is the II portion enlarged drawing among Fig. 4;
Fig. 7 is the III portion enlarged drawing among Fig. 4;
Fig. 8 is the IV portion enlarged drawing among Fig. 4;
Fig. 9 is the V portion enlarged drawing among Fig. 4;
Figure 10 is the circuit theory diagrams of the DC/DC converter of the utility model specific embodiment;
Figure 11 is the Transformer Winding distribution map of the utility model specific embodiment.
Description of reference numerals
1 power input, 11 start-up circuits
2 switching circuits, 21 ON-OFF control circuit
22 switching tubes, 3 transformers
30 magnetic cores, 31 input windings
310 RC absorb circuit 32 output windings
320 loads output winding, 321 fan windings
322 Frequency Converter Control plate multi-segment voltages power supply winding
323+12V output winding, 33 auxiliary windings
4 DC/DC converters, 41+5V output
5 feedback compensation circuit, 6 excess voltage protections
Embodiment
In order to more fully understand technology contents of the present utility model, below in conjunction with specific embodiment the technical solution of the utility model is further introduced and explanation, but be not limited to this.
Figure 1 shows that quasi-resonance formula inverse excitation type converter schematic diagram (a portion) and the switching tube Vds thereof that the utility model adopts and contrast oscillogram (b portion) switching time.Can see to draw from Fig. 2, adopt the Switching Power Supply of quasi-resonance formula inverse excitation type converter, its EMI can be little more a lot of than the Switching Power Supply that adopts fixed-frequency PWM.
Fig. 3 is that a kind of Switching Power Supply based on quasi-resonance of the utility model specifically is implemented on the circuit block diagram in the Frequency Converter Control, a kind of Switching Power Supply of the utility model skill based on quasi-resonance, comprise power input 1, transformer 3, switching circuit 2, transformer 3 comprises magnetic core 30, the input winding 31 that connects with power input 1, the output winding 32 that connects with external loading and the auxiliary winding 33 that connects with switching circuit; Switching circuit 2 comprises ON-OFF control circuit 21 and switching tube 22; Switching tube 22 is connected with input winding 31.ON-OFF control circuit 21 is the PWM chip, and the PWM chip is provided with the power supply input port and connects with power end; The input winding 31 of transformer 3 is parallel with RC and absorbs circuit 310.The power supply input port of ON-OFF control circuit 21 also is in series with start-up circuit 11.Also be provided with feedback compensation circuit 5, feedback compensation circuit 5 is provided with and exports input that winding 3 connects and the output that connects with ON-OFF control circuit 21.Also be provided with excess voltage protection 6, excess voltage protection 6 is provided with and exports input that winding 3 connects and the output that connects with ON-OFF control circuit 21.Output winding 32 is some groups, and wherein one group is connected with DC/DC converter 4+12V output winding.Output winding 32 comprises four groups of load output windings 320 that are used to drive frequency converter IGBT assembly; Also comprise the fan winding 321 that is used to drive the frequency converter fan; Be used to connect the multi-segment voltage supply winding 322 of Frequency Converter Control plate.
, the particular circuit configurations of present embodiment is illustrated further to physical circuit schematic diagram shown in Figure 9 below in conjunction with Fig. 4:
Be as the criterion resonant mode inverse excitation type converter main circuit (the PWM chip adopts L6565 in the present embodiment), feedback loop (auxiliary winding) and start-up circuit of Fig. 5 (is made up of R103, R104, R105, C57, ZD5, C56.R103, R104, R105 series connection, R103 links power positive end P in the upper end.The negative electrode of the right-hand member of R105 lower end, R108, C57 positive pole, ZD5, C56 upper end are linked 8 pin of PWM chip U6 together, provide to start power supply).When powering on, by resistance R 103, R104, R105 provides the startup power supply to capacitor C 57 chargings to chip, and the starting current of PWM chip is less than 70uA, and static standby current is less than 3.5mA.After the PWM chip was started working, auxiliary winding was by diode D27, and 108 pairs of capacitor C of 22 Europe resistance R 57 are charged, and R108 plays the RC filter action, power supply is provided for the PWM chip.20V voltage-stabiliser tube ZD5 plays clamper and protects the PWM chip.Switching tube is selected 1500V for use, the mos pipe of 2A (adopting the 2sk2225 model in the present embodiment), and driving resistor is 68 Europe.Resistance R 106 plays the no-voltage detection effect, is used to detect the lowest point of voltage when turn-offing.The CS pin (4 pin) that 110 electric current detection effect of resistance R, sample rate current signal are delivered to the PWM chip carries out current feedback, and plays overcurrent protection.
Comprised excess voltage protection and feedback compensation circuit among Fig. 6, wherein excess voltage protection is made up of optocoupler PC3 (adopting PC356NT in the present embodiment), R138, C77, U11, R139, R135, R137, R132, D37.R138, R137, optocoupler PC3 one end are connected to the wherein one tunnel+27V of driving voltage, and the G utmost point of R138, C77, R139, U11 links together, the A utmost point of U11, the R139 other end, the C77 other end are connected to+and 27V is with reference to ground.The K utmost point of R135, R137, U11 connects together, and the R135 other end is connected to 2 pin of optocoupler PC3.3 pin of optocoupler PC3 are connected to the power supply input with reference to ground N.1 pin of optocoupler PC3, R132, D37 link together.The diode D37 other end is received PWM chip 2 pin.Link the other end of R132 to the accessory power supply VCC of PWM chip power supply.Because the driving voltage of IGBT is 35V to the maximum, surpassing the IGBT gate pole will damage.Detect so must be in time the driving power of IGBT be carried out overvoltage protection, in case surpass voltage lockout switch PWM output at once.U11 is TL431, plays the comparator effect herein, reaches 32V in case detect voltage, and the G pole tension of TL431 will surpass 2.5V, TL431 conducting fully after the dividing potential drop.This moment, optocoupler PC3 can conducting, and the Vcomp conducting can drag down the COMP pin of U6 chip, when COMP voltage is lower than 2.25V, will cut off PWM output.Other feedback compensation circuit then is made of R140, R141, U10, C75, R136, R134, R133, optocoupler PC2 (adopting PC356NT in the present embodiment).The G utmost point of the end of R140, R141, R136, U10 (TL431 model) connects together.The end of R133, R134 and the other end of R140 link together.The other end of 2 pin of optocoupler PC2, R134 lower end, C75, the K utmost point of U10 connect together.Output detects feedback circuit and detects the G utmost point that output voltage is delivered to U10 (TL431) by divider resistance R140, R141, U10 (TL431) is equivalent to operational amplifier herein, and the compensator capacitance resistance is C75, C76, R136 constitutes, and regulates their values and can carry out calibration to system.Linear optical coupling plays isolation and send 2 pin of PWM chip with feedback signal, is used as the electric current comparison point, adjusts PWM output service time.The R133 of the feedback compensation circuit in the present embodiment is that 7.5k, R134 are that 12k, C75 are that 330n, R136 are 0, R140 is that 19.6k, R141 are 2k.
Fig. 7 and Fig. 8 provide the winding of multi-segment voltage and the output circuit figure of fan winding for giving the Frequency Converter Control plate, wherein have a winding to export winding, can be used for the feeder ear of DC/DC converter for+12V.Fan winding and input winding are located at the same side of magnetic core, charge to electric capacity by rectifier diode after the work of fan winding, need dummy load in parallel on the output capacitance, and output capacitance is too high when preventing underloading.Fan 24V winding will be against former limit winding at transformer, and electric current is excessive when preventing starting fan like this, influences other road output voltage, improves power supply intersection regulation.The multi-segment voltage of Frequency Converter Control plate power supply winding comprise power supply common ground+24V ,+15V ,+12V ,+18V ,-15V power supply winding.Winding+12V ,+15V ,+24V are that superposing type winding advantage is to reduce the transformer total number of turns.Improve power supply output intersection regulation.Wherein+15V passes through U7 (L7815) linear transformation by Transformer Winding output 20V to guarantee the stability to the amplifier power supply for+15V again.-15V passes through U8 (L7815) linear transformation by Transformer Winding output-20V to be-15V again.
The output winding one of transformer has 13 road output voltages (27v of isolation, 27v, 27v, 27v, 24v, 24v, 18v, 12v, altogether+24v, 20v ,-20v, 12v, 5v), the ZCD of R106 detects resistance, the feedback compensation network that PC356, R133, R134, R136, C75, R140, R141 form, the linear power supply of+20V commentaries on classics+15V, the linear power supply of-20V commentaries on classics-15V, 4 road 27V adopt ZD4 and R102 respectively, R100 and ZD2, R101 and ZD3, R129 and ZD7 constitute is divided into+17V and-positive-negative power of 10V drives IGBT.Transformer output winding T2E, D28, C59, R112, C67, U7, C70 form+20V commentaries on classics+15V linear power supply.The end of the same name of winding T2E is linked the anode of D28, and the input of D28 negative electrode, capacitor C 59 anodes, R112 upper end, C67 upper end, U7 is linked together.The negative terminal of C59, R112 lower end, C67 lower end, U7 pin link+and 20V is with reference to ground.Link+15V output 3 pin of U7, the upper end of C70.Transformer output winding T2F, D30, C61, R113, C68, U8 (L7815), C71 form-linear power supply of 20V commentaries on classics-15V.Output winding end of the same name is linked ground, and the other end is linked the negative electrode of diode D30.The anode of diode D30 is linked the negative pole of capacitor C 61, the upper end of R113, the upper end of C68, the input of U8 (L7815).2 pin of C61 positive pole, R113 lower end, C68 lower end, L7915, the anode of capacitor C 71 link-and 15V is with reference to ground.3 pin of U8 (L7815) and the negative electrode of capacitor C 71 are linked-15V output.
That shown in Figure 9 is 4 groups of load output winding circuit figure, is used to drive the IGBT element of frequency converter, and driving power is+27v.The end of the same name of transformer auxiliary winding T2K is linked diode D17 anode.D17 negative electrode, R102 upper end, C52 positive pole are just being linked the driving voltage reference.The negative electrode of R102 lower end, ZD4, C52 negative pole, C55 positive pole link together.The anode of ZD4, the negative pole of C55 are connected to driving voltage with reference to negative.The end of the same name of transformer auxiliary winding T2L is linked diode D15 anode.D15 negative electrode, R100 upper end, C50 positive pole are just being linked the driving voltage reference.The negative electrode of R100 lower end, ZD2, C50 negative pole, C53 positive pole link together.The anode of ZD2, the negative pole of C53 are connected to driving voltage with reference to negative.The end of the same name of transformer auxiliary winding T2J is linked diode D16 anode.D16 negative electrode, R101 upper end, C51 positive pole are just being linked the driving voltage reference.The negative electrode of R101 lower end, ZD3, C51 negative pole, C54 positive pole link together.The anode of ZD3, the negative pole of C54 are connected to driving voltage with reference to negative.The end of the same name of transformer auxiliary winding T2I is linked diode D36 anode.D36 negative electrode, R129 upper end, C22 positive pole are just being linked the driving voltage reference.The negative electrode of R129 lower end, ZD7, C22 negative pole, C21 positive pole link together.The anode of ZD7, the negative pole of C21 are connected to driving voltage with reference to negative.
Figure 10 shows that DC/DC converter circuit (forwarding 5V to), form that U4 adopts AOZ1010 code converter chip by capacitor C 5, C14, U4, R22, C6, L1, C7, R23, R24, C8, C13 by 12V.C5 positive pole and C14 are connected to 6 pin and 2 pin of U4, receive power supply 12V together, and the negative pole of C5 receives ground.R22 and C6 series connection, one of R22 connects 5 pin of U4, and the AGND and the PGND of chip received in the other end.One of L 1 is received in 7 pin of U4 and 8 pin parallel connections together, and the other end of L1 is connected to C7, R23, C8 positive pole, C13, receives output+5V together.Negative pole, the C13 of R24, C8 receive ground together.R23, R24, C7 link 4 pin of receiving chip U4 together.This converter U4 be high efficiency buck converter to be used for the 12V power source change be the 5V power supply, output current is 2A.Producing frequency is the switching frequency of 500k, is operated in the current feedback pattern.Inner integrated schottky diode, short-circuit protection, overheated shutoff, fixedly switching frequency, the efficient of 500k reach 95%.By all overcurrent limiting, inner band under-voltage protecting circuit.Adopt 2 divider resistances to be sent to the FB pin and be used for feedback from output sampling branch.COMP pin connection R22 and C6 are as feedback compensation.Inductance L 1 adopts 4.7uH, and the 2A inductance is because switching frequency reaches 500k, so inductance and capacitance can be used very for a short time.Utilize PCB shop copper as heat radiation.Input capacitance is connected between VIN and the PGND pin short as much as possible during PCB layout.It is short as much as possible that process LX pin inductance and output capacitance flow to the current path of PGND.The EN pin is an Enable Pin, directly is connected to power input, default enable in this circuit.Compare with linear power supply and low switching frequency L2575, size reduces greatly, and efficient improves greatly.
Figure 11 is the Transformer Winding distribution map; Order is that former limit, N2 are fan 24V for auxiliary winding, N14 for N1 from inside to outside successively, N12 for 24V output winding altogether, N11 for altogether-20v output winding, N13 be the 24V winding of the 18V winding of the 12V winding of isolating, isolation, isolation, N5, N4, N3, the N2 27V winding for driving for 20V output winding altogether, N10 for 12V output altogether, E are the earth, N8.For leakage inductance and the distributed capacitance that reduces transformer, between former limit of transformer and secondary, adopt the copper-clad line to connect the earth and isolate.As what press from both sides between the N8 of Figure 11 and the N12 is that copper cash connects the earth.Test shows that such order of presentation can guarantee the intersection regulation height between each road output.Magnetic core adopts ETD39, and skeleton adopts 44 pin, and spacing is 2.5mm.Former limit inductance is 2mH, and withstand voltage between the insulating power supply is 3000V.
Present embodiment is because be to be used for frequency converter, and power input is connected to the DC output of the AC/DC transformer of main circuit of converter front end, if implement as independent Switching Power Supply product, then also need increase an AC transformer at the front end of power input.The PWM chip can adopt other model in other embodiment, such as LM2618, NCP1200, FSD200).
In sum; the utility model is because of utilizing the principle of quasi-resonance formula flyback switching converter; and have additional the DC/DC converter of excess voltage protection, feedback compensation circuit and 500k switching frequency; can improve the reliable property of Switching Power Supply, input voltage range effectively; reduce EMI; reduce the wastage, physical dimension is dwindled, and is particularly suitable for being applied to the operational environment of frequency converter.
The above only further specifies technology contents of the present utility model with embodiment; so that the reader is more readily understood; but do not represent execution mode of the present utility model to only limit to this, any technology of doing according to the utility model is extended or recreation, all is subjected to protection of the present utility model.Protection range of the present utility model is as the criterion with claims.
Claims (10)
1. Switching Power Supply based on quasi-resonance, its feature comprises power input, transformer, switching circuit, and described transformer comprises the input winding that connects with power input, the output winding that connects with external loading and the auxiliary winding that connects with switching circuit; Described switching circuit comprises ON-OFF control circuit and switching tube; Described switching tube and input windings in series.
2. a kind of Switching Power Supply based on quasi-resonance according to claim 1 is characterized in that described ON-OFF control circuit is the PWM chip, and described PWM chip is provided with the power supply input port and connects with power end; The input winding of described transformer is parallel with RC and absorbs circuit.
3. a kind of Switching Power Supply based on quasi-resonance according to claim 2 is characterized in that the power supply input port of described ON-OFF control circuit also is in series with start-up circuit.
4. a kind of Switching Power Supply according to claim 3 based on quasi-resonance, its feature also is provided with the feedback compensation circuit, and described feedback compensation circuit is provided with and exports input that winding connects and the output that connects with ON-OFF control circuit.
5. a kind of Switching Power Supply according to claim 3 based on quasi-resonance, its feature also is provided with excess voltage protection, and described excess voltage protection is provided with and exports input that winding connects and the output that connects with ON-OFF control circuit.
6. according to claim 4 or 5 described a kind of Switching Power Supplies based on quasi-resonance, it is characterized in that described output winding is some groups, wherein one group also is connected with the DC/DC converter.
7. a kind of Switching Power Supply based on quasi-resonance according to claim 6 is characterized in that described output winding comprises four groups of load output windings that are used to drive frequency converter IGBT assembly; Also comprise the fan winding that is used to drive the frequency converter fan; Be used to connect the multi-segment voltage supply winding of Frequency Converter Control plate.
8. a kind of Switching Power Supply based on quasi-resonance according to claim 7 is characterized in that described PWM chip is the L6565 cake core, and described DC/DC converter is the AOZ1010 cake core.
9. a kind of Switching Power Supply based on quasi-resonance according to claim 8 is characterized in that described fan winding and input winding are located at the same side.
10. a kind of Switching Power Supply according to claim 8 based on quasi-resonance, it is characterized in that adopting the copper-clad line to connect the earth between described transformer input winding and the output winding isolates, the magnetic core of described transformer adopts ETD39, and skeleton adopts 44 pin, and spacing is 2.5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201359853U CN201414084Y (en) | 2009-03-31 | 2009-03-31 | Switch power supply based on quasi-resonance |
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| CN2009201359853U CN201414084Y (en) | 2009-03-31 | 2009-03-31 | Switch power supply based on quasi-resonance |
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| CN201414084Y true CN201414084Y (en) | 2010-02-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740572A (en) * | 2012-07-18 | 2012-10-17 | 广州凯盛电子科技有限公司 | Driving power supply control circuit |
| CN103795232A (en) * | 2013-11-30 | 2014-05-14 | 许继电气股份有限公司 | Quasi resonant flyback power supply and high voltage starting circuit thereof |
| CN104638946A (en) * | 2015-02-11 | 2015-05-20 | 深圳市华芯邦科技有限公司 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN106230266A (en) * | 2016-08-26 | 2016-12-14 | 江苏伟屹电子有限公司 | Micro Energy Lose Width funtion high efficiency multiple-channel output insulating power supply circuit |
| CN106338124A (en) * | 2015-07-10 | 2017-01-18 | 青岛中集特种冷藏设备有限公司 | Regulation control system for micro-environment in refrigerating container and refrigerating container |
| CN107839510A (en) * | 2017-09-28 | 2018-03-27 | 无锡昊瑜节能环保设备有限公司 | A kind of electric car accumulator cell charging and discharging intelligence control system |
-
2009
- 2009-03-31 CN CN2009201359853U patent/CN201414084Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102740572A (en) * | 2012-07-18 | 2012-10-17 | 广州凯盛电子科技有限公司 | Driving power supply control circuit |
| CN102740572B (en) * | 2012-07-18 | 2015-09-30 | 广州凯盛电子科技有限公司 | Driving power control circuit |
| CN103795232A (en) * | 2013-11-30 | 2014-05-14 | 许继电气股份有限公司 | Quasi resonant flyback power supply and high voltage starting circuit thereof |
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN104638946A (en) * | 2015-02-11 | 2015-05-20 | 深圳市华芯邦科技有限公司 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
| CN106338124A (en) * | 2015-07-10 | 2017-01-18 | 青岛中集特种冷藏设备有限公司 | Regulation control system for micro-environment in refrigerating container and refrigerating container |
| CN106230266A (en) * | 2016-08-26 | 2016-12-14 | 江苏伟屹电子有限公司 | Micro Energy Lose Width funtion high efficiency multiple-channel output insulating power supply circuit |
| CN107839510A (en) * | 2017-09-28 | 2018-03-27 | 无锡昊瑜节能环保设备有限公司 | A kind of electric car accumulator cell charging and discharging intelligence control system |
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