CN204030965U - A kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate - Google Patents
A kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate Download PDFInfo
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- CN204030965U CN204030965U CN201420452095.6U CN201420452095U CN204030965U CN 204030965 U CN204030965 U CN 204030965U CN 201420452095 U CN201420452095 U CN 201420452095U CN 204030965 U CN204030965 U CN 204030965U
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- 239000004065 semiconductor Substances 0.000 claims description 30
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Abstract
The utility model discloses a kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate, comprise step-down power supply circuit and second level power supply circuits, step-down power supply circuit comprises direct-flow input circuit, power conversion circuit, pwm control circuit, sampling feedback circuit and low voltage DC output circuit, and second level power supply circuits comprise switching tube, PWM controller and a plurality of from transformer and a plurality of DC output end; From the positive pole of the first termination step-down power supply circuit low voltage DC output circuit of transformer primary side winding, the negative pole of described low voltage DC output circuit is connect by switching tube, the pwm control signal output of the control termination PWM controller of switching tube from the second end of transformer primary side winding; DC output end is connect by current rectifying and wave filtering circuit from the vice-side winding of transformer.Auxiliary power circuit output voltage precision of the present utility model is high, ripple is little, transformer is easy to make.
Description
[technical field]
The utility model relates to three-phase main-frequency inverter, particularly relates to a kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate.
[background technology]
The effect of the accessory power supply of three-phase main-frequency Driven by inverter plate provides power supply mainly to the drive circuit of IGBT module, the power conversion device of three-phase main-frequency inverter is IGBT module, because IGBT module price comparison is high, so its driving voltage will be stablized, the IGBT rear drive voltage that normally works can not be dragged down, and ripple is little.If driving voltage precision is difficult to control, its consequence likely IGBT can be burnt out.
The structure of the auxiliary power circuit of tradition Three-phase high-power inverter and principle as shown in Figure 1, comprise direct-flow input circuit, power conversion circuit, pwm control circuit, sampling feedback circuit and low voltage DC output circuit.Power conversion circuit comprises former limit winding and the metal-oxide-semiconductor Q1 of main transformer T1, pwm control circuit comprises pwm chip U1, sampling feedback circuit comprises output voltage sampling circuit, reference voltage circuit and isolation feedback circuit, and low voltage DC output circuit comprises multiple vice-side winding of transformer T1 and corresponding rectifying and wave-filtering output circuit.The IGBT of Three-phase high-power inverter drives the positive-negative power needing many group isolation, IGBT driving power has 6 tunnels, so many output is made on a transformer certain difficulty, and consider from the angle of safety, transformer lead pin spacing needs certain safe distance.The auxiliary power circuit of the Three-phase high-power inverter shown in Fig. 1 can see that transformer T1 needs 16 pins, the skeleton of so many pins is difficult to make, and the coupling effect of winding winding of the ratio of winding inner ring of outer ring when same number of turns is poor, the output voltage of outer ring winding can be less than the winding of internal layer, transformer output voltage precision is difficult to control, and its consequence likely IGBT can be burnt out.
[utility model content]
The technical problems to be solved in the utility model is to provide the auxiliary power circuit that a kind of output voltage precision is high, ripple is little, transformer is easy to the three-phase main-frequency Driven by inverter plate made.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate, comprise step-down power supply circuit and second level power supply circuits, step-down power supply circuit comprises direct-flow input circuit, power conversion circuit, pwm control circuit, sampling feedback circuit and low voltage DC output circuit, and second level power supply circuits comprise switching tube, PWM controller and a plurality of from transformer and a plurality of DC output end; From the positive pole of the first termination step-down power supply circuit low voltage DC output circuit of transformer primary side winding, the negative pole of described low voltage DC output circuit is connect by switching tube, the pwm control signal output of the control termination PWM controller of switching tube from the second end of transformer primary side winding; DC output end is connect by current rectifying and wave filtering circuit from the vice-side winding of transformer.
Above-described auxiliary power circuit, comprises a plurality of vice-side winding from transformer, and each vice-side winding connects corresponding DC output end by corresponding current rectifying and wave filtering circuit.
Above-described auxiliary power circuit, described switching tube is the second metal-oxide-semiconductor, and the drain electrode of the second metal-oxide-semiconductor connects the second end from transformer primary side winding, and source electrode connects the negative pole of described low voltage DC output circuit, and grid connects the pwm control signal output of PWM controller.
Above-described auxiliary power circuit, PWM controller adopts 555 time-base integrated circuits and peripheral circuit thereof.
Above-described auxiliary power circuit, be with centre tapped winding from transformer secondary winding, current rectifying and wave filtering circuit comprises the first diode, the second diode, the first electric capacity and the second electric capacity, from the anode of transformer secondary winding first termination first diode, the negative electrode of the first diode connects the positive pole of DC output end; From the negative electrode of transformer secondary winding second termination second diode, the anode of the first diode connects the negative pole of DC output end; From the centre cap ground connection of transformer secondary winding, the first electric capacity is connected between the positive pole of DC output end and ground, and the second electric capacity is connected between the negative pole of DC output end and ground.
Above-described auxiliary power circuit, transformer secondary winding first end with from the first end of transformer primary side winding be Same Name of Ends.
Above-described auxiliary power circuit, comprises and cuts negative peak diode, comprises the 3rd end from transformer primary side winding, and the first end of transformer primary side winding is drawn from the tap between the second end and the 3rd end; The anode cutting negative peak diode connects the negative pole of described low voltage DC output circuit, and negative electrode connects the 3rd end of transformer primary side winding.
Above-described auxiliary power circuit, power conversion circuit comprises main transformer and the first metal-oxide-semiconductor, the positive pole of direct-flow input circuit connects the first end of main transformer former limit winding, second termination second metal-oxide-semiconductor drain electrode of main transformer former limit winding, the source electrode of the second metal-oxide-semiconductor connects the negative pole of direct-flow input circuit, the PWM output of the grid pwm control circuit of the second metal-oxide-semiconductor.
Above-described auxiliary power circuit, low voltage DC output circuit comprises vice-side winding and first current rectifying and wave filtering circuit of main transformer, and the first current rectifying and wave filtering circuit connects the vice-side winding output of main transformer; Pwm control circuit comprises power supply control chip and peripheral circuit thereof, and the grid of the second metal-oxide-semiconductor connects the PWM output pin of power supply control chip; Sampling feedback circuit comprises chip power supply circuit, voltage sample comparison circuit and optical coupling isolation circuit, chip power supply circuit comprises the second vice-side winding and second current rectifying and wave filtering circuit of main transformer, and the second current rectifying and wave filtering circuit connects the second vice-side winding output of main transformer; Voltage sample comparison circuit connects the output of the second current rectifying and wave filtering circuit, and the output of voltage sample comparison circuit connects the frequency compensation input pin of power supply control chip by optical coupling isolation circuit.
Above-described auxiliary power circuit, sampling feedback circuit comprises current sampling resistor, and the source electrode of the second metal-oxide-semiconductor connects the negative pole of direct-flow input circuit by current sampling resistor; The source electrode of the second metal-oxide-semiconductor connects power supply control chip current detecting input pin.
The auxiliary power circuit output voltage precision of the utility model three-phase main-frequency Driven by inverter plate is high, ripple is little, transformer is easy to make.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of the auxiliary power circuit of prior art Three-phase high-power inverter.
Fig. 2 is the schematic diagram of the utility model embodiment three-phase main-frequency Driven by inverter plate accessory power supply first order circuit.
Fig. 3 is the schematic diagram of the utility model embodiment three-phase main-frequency Driven by inverter plate accessory power supply second level circuit.
[embodiment]
The structure of the embodiment of the auxiliary power circuit of the utility model three-phase main-frequency Driven by inverter plate as shown in Figures 2 and 3, comprise altogether two parts circuit, the first order is step-down power supply circuit, 220V DC input voitage is dropped to 12V voltage supply second level circuit use, second level circuit becomes the positive-negative power of multichannel to export the voltage transitions after step-down.
The operation principle of first order step-down power supply circuit is as shown in Figure 2: draw together direct-flow input circuit, power conversion circuit, pwm control circuit, sampling feedback circuit and low voltage DC output circuit.Circuit adopts inverse-excitation converting circuit, when converter switches on power, input direct-current 220V voltage via resistance R1 and start diode D2 composition start-up circuit voltage stabilizing step-down after connect 7 pin of UC3843, start power supply control chip U1 (fixed frequency current mode controller UC3843) and enter normal work, the power supply circuits of main transformer T1 vice-side winding N3 are started working, export and export+12V voltage after D6 and C11 rectification and filtering, + 12V voltage delivers to 7 pin of UC3843 by diode D1, + 12V voltage makes startup diode D2 reverse-biased higher than the starting resistor of chip UC3843, start-up circuit quits work, powered by the power supply circuits of vice-side winding N3.
After translation circuit enters normal work, according to the work of PWM pulse width modulation mode, 220V DC input voitage positive pole connects 1 pin of the former limit winding N1 of main transformer T1,2 pin of N1 winding connect the D pole (drain electrode) of metal-oxide-semiconductor Q1, the S pole (source electrode) of metal-oxide-semiconductor Q1 through current sampling resistor R7 connect direct current input negative pole ().The PWM output pin (6 pin) of G pole (grid) by driving resistance R4 to receive U1 (UC3843) of metal-oxide-semiconductor Q1.The output of main transformer T1 vice-side winding N2, after diode D5 rectification and the filtering of electric capacity C10 device, produces 12V output dc voltage, for second level circuit.
+ 12V the output voltage of main transformer T1 vice-side winding N3 is by after resistance R15 and R13 dividing potential drop, compare with the 2.5V reference voltage in three end adjustable shunt reference voltage sources U3 (TL431), then the frequency compensation input pin (1 pin) of UC3843 is fed back to by optical coupler U2, control the duty ratio exporting pulse, stablize the output of main transformer T1 vice-side winding N2 and N3.Current sampling resistor R7 detects the over-current signal of switching tube Q1, sends into the current detecting input pin (3 pin) of UC3843, blocks the output signal of UC3843, realizes overcurrent protection.
Second level circuit becomes the positive-negative power output circuit of multichannel the 12V voltage transitions after the step-down of first order circuit, is made up of pwm chip U2 (555 time-base integrated circuit), metal-oxide-semiconductor Q2, transformer T2 and transformer T3 and rectifying and wave-filtering output circuit.
The operation principle of second level circuit is as follows: circuit adopts inverse-excitation converting circuit, promotes two from transformer T2 and T3 with a metal-oxide-semiconductor Q2.
PWM controller adopts 555 time-base integrated circuits and peripheral circuit thereof.When the first order has voltage to export, the power supply pin (8 pin) of input direct voltage 12V to U2 (V), U2 obtains after power supply starts to and enter normal operating conditions, and circuit works according to PWM mode.
Identical from the structure of transformer T2 with T3, for from transformer T2, draw from former limit winding N1 first end (2 pin) of transformer T2 from the tap between the second end (3 pin) and the 3rd end (1 pin).The anode cutting negative peak diode D8 connects the negative pole of first order low voltage DC output circuit (12V DC power supply), and negative electrode connects the 3rd end (1 pin) of transformer primary side winding.
The positive pole of 12V DC power supply connects the first end (2 pin) from transformer T2 and the former limit winding N1 from transformer T3 respectively, second end (3 pin) of former limit winding N1 connects the D pole (drain electrode) of metal-oxide-semiconductor Q2, the S pole (source electrode) of metal-oxide-semiconductor Q2 connect the negative pole of first order low voltage DC output circuit (12V DC power supply) ().The PWM output pin (3 pin) of G pole (grid) by driving resistance R18 to receive U2 (NE555) of metal-oxide-semiconductor Q2.
Respectively have two vice-side winding from transformer T2 with from transformer T3, the output of two vice-side winding has respective rectifies, after respective filter capacitor filtering clutter, and the direct voltage of stable output.
All with centre tapped winding from transformer T2 with from the vice-side winding of transformer T3, for vice-side winding N2, N3, current rectifying and wave filtering circuit comprises diode D10, diode D11, electric capacity C14 and electric capacity C15, from the anode of transformer secondary winding first terminating diode D10, the negative electrode of diode D10 meets the positive pole OUT1+ of DC output end; From transformer secondary winding N2, N3 second negative electrode of terminating diode D11, the anode of diode D11 meets the negative pole OUT1-of DC output end; Be connected between the positive pole OUT1+ of DC output end and ground out1GND from the centre cap ground connection out1GND of transformer secondary winding N2, N3, electric capacity C14, electric capacity C15 is connected between the negative pole OUT1-of DC output end and ground out1GND.
From transformer secondary winding first end with from the first end of transformer primary side winding be Same Name of Ends.
Second level circuit does not use overvoltage and current foldback circuit; reason is the input voltage of the second level is convert by the first order stable DC electricity got; the PWM frequency that second level circuit PWM control IC (NE555) exports and pulsewidth are fixing; the voltage exported in this mode is more steady; output voltage ripple is less, and design of transformer is simpler.
In sum, the positive pole of the secondary output of main transformer T1 is directly connected from an input of the former limit winding of transformer T2, T3 with two of the second level, be connected from the other end of transformer T2, T3 former limit winding with the source electrode of the metal-oxide-semiconductor the circuit of the second level, the negative pole of the secondary output of main transformer is received in the drain electrode of metal-oxide-semiconductor.The output of the pwm control circuit of second level circuit is connected to the grid of metal-oxide-semiconductor Q2 in the circuit of the second level.Secondaryly after rectification, filtering, IGBT to be powered from many groups of transformer.
Compared to the prior art, the beneficial effect of the auxiliary power circuit embodiment of the utility model three-phase main-frequency Driven by inverter plate is: main transformer and from transformer all than being easier to design, and each group output voltage precision is high, and ripple is little.
Claims (10)
1. the auxiliary power circuit of a three-phase main-frequency Driven by inverter plate, comprise step-down power supply circuit, step-down power supply circuit comprises direct-flow input circuit, power conversion circuit, pwm control circuit, sampling feedback circuit and low voltage DC output circuit, it is characterized in that, comprise second level power supply circuits, second level power supply circuits comprise switching tube, PWM controller and a plurality of from transformer and a plurality of DC output end; From the positive pole of the first termination step-down power supply circuit low voltage DC output circuit of transformer primary side winding, the negative pole of described low voltage DC output circuit is connect by switching tube, the pwm control signal output of the control termination PWM controller of switching tube from the second end of transformer primary side winding; DC output end is connect by current rectifying and wave filtering circuit from the vice-side winding of transformer.
2. auxiliary power circuit according to claim 1, is characterized in that, comprises a plurality of vice-side winding from transformer, and each vice-side winding connects corresponding DC output end by corresponding current rectifying and wave filtering circuit.
3. auxiliary power circuit according to claim 1, it is characterized in that, described switching tube is the second metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor connects the second end from transformer primary side winding, source electrode connects the negative pole of described low voltage DC output circuit, and grid connects the pwm control signal output of PWM controller.
4. auxiliary power circuit according to claim 1, is characterized in that, PWM controller adopts 555 time-base integrated circuits and peripheral circuit thereof.
5. auxiliary power circuit according to claim 1, it is characterized in that, be with centre tapped winding from transformer secondary winding, current rectifying and wave filtering circuit comprises the first diode, the second diode, the first electric capacity and the second electric capacity, from the anode of transformer secondary winding first termination first diode, the negative electrode of the first diode connects the positive pole of DC output end; From the negative electrode of transformer secondary winding second termination second diode, the anode of the first diode connects the negative pole of DC output end; From the centre cap ground connection of transformer secondary winding, the first electric capacity is connected between the positive pole of DC output end and ground, and the second electric capacity is connected between the negative pole of DC output end and ground.
6. auxiliary power circuit according to claim 1, is characterized in that, transformer secondary winding first end with from the first end of transformer primary side winding be Same Name of Ends.
7. auxiliary power circuit according to claim 1, is characterized in that, comprises and cuts negative peak diode, comprises the 3rd end from transformer primary side winding, and the first end of transformer primary side winding is drawn from the tap between the second end and the 3rd end; The anode cutting negative peak diode connects the negative pole of described low voltage DC output circuit, and negative electrode connects the 3rd end of transformer primary side winding.
8. auxiliary power circuit according to claim 1, it is characterized in that, power conversion circuit comprises main transformer and the first metal-oxide-semiconductor, the positive pole of direct-flow input circuit connects the first end of main transformer former limit winding, second termination second metal-oxide-semiconductor drain electrode of main transformer former limit winding, the source electrode of the second metal-oxide-semiconductor connects the negative pole of direct-flow input circuit, the PWM output of the grid pwm control circuit of the second metal-oxide-semiconductor.
9. auxiliary power circuit according to claim 8, is characterized in that, low voltage DC output circuit comprises vice-side winding and first current rectifying and wave filtering circuit of main transformer, and the first current rectifying and wave filtering circuit connects the vice-side winding output of main transformer; Pwm control circuit comprises power supply control chip and peripheral circuit thereof, and the grid of the second metal-oxide-semiconductor connects the PWM output pin of power supply control chip; Sampling feedback circuit comprises chip power supply circuit, voltage sample comparison circuit and optical coupling isolation circuit, chip power supply circuit comprises the second vice-side winding and second current rectifying and wave filtering circuit of main transformer, and the second current rectifying and wave filtering circuit connects the second vice-side winding output of main transformer; Voltage sample comparison circuit connects the output of the second current rectifying and wave filtering circuit, and the output of voltage sample comparison circuit connects the frequency compensation input pin of power supply control chip by optical coupling isolation circuit.
10. auxiliary power circuit according to claim 9, is characterized in that, sampling feedback circuit comprises current sampling resistor, and the source electrode of the second metal-oxide-semiconductor connects the negative pole of direct-flow input circuit by current sampling resistor; The source electrode of the second metal-oxide-semiconductor connects power supply control chip current detecting input pin.
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| CN201420452095.6U CN204030965U (en) | 2014-08-12 | 2014-08-12 | A kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate |
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| CN201420452095.6U CN204030965U (en) | 2014-08-12 | 2014-08-12 | A kind of auxiliary power circuit of three-phase main-frequency Driven by inverter plate |
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| CN106533194A (en) * | 2016-12-15 | 2017-03-22 | 广东百事泰电子商务股份有限公司 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
| CN106787799A (en) * | 2016-12-27 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | A kind of intelligent sine voltage change-over circuit based on PFC normal shock half-bridges |
| CN106787800A (en) * | 2016-12-27 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | A kind of intelligent amendment wave voltage change-over circuit based on PFC normal shock half-bridges |
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| CN107888054A (en) * | 2017-11-20 | 2018-04-06 | 山东超越数控电子股份有限公司 | A kind of design method of multichannel isolation circuit output driving power supply |
| CN108282090A (en) * | 2017-12-29 | 2018-07-13 | 河南北瑞电子科技有限公司 | A kind of flyback switch voltage-stabilized source |
| CN108365744A (en) * | 2018-01-03 | 2018-08-03 | 浙江正泰电器股份有限公司 | The IGBT drive circuit of frequency converter |
| CN109462331A (en) * | 2018-12-29 | 2019-03-12 | 重庆力华亘田科技有限责任公司 | A kind of auxiliary power circuit for general purpose engine |
| CN110417271A (en) * | 2019-07-24 | 2019-11-05 | 珠海银河耐吉科技股份有限公司 | A photovoltaic inverter drive circuit |
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| CN112165256A (en) * | 2020-10-30 | 2021-01-01 | 杭州海兴电力科技股份有限公司 | DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter |
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- 2014-08-12 CN CN201420452095.6U patent/CN204030965U/en not_active Expired - Fee Related
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| CN106533194A (en) * | 2016-12-15 | 2017-03-22 | 广东百事泰电子商务股份有限公司 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
| CN106787799A (en) * | 2016-12-27 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | A kind of intelligent sine voltage change-over circuit based on PFC normal shock half-bridges |
| CN106787800A (en) * | 2016-12-27 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | A kind of intelligent amendment wave voltage change-over circuit based on PFC normal shock half-bridges |
| CN107491003A (en) * | 2017-07-31 | 2017-12-19 | 浙江榆阳电子有限公司 | A kind of intelligence control system of electric heating quilt, Electric heating mattress and electric heating blanket |
| CN107888054A (en) * | 2017-11-20 | 2018-04-06 | 山东超越数控电子股份有限公司 | A kind of design method of multichannel isolation circuit output driving power supply |
| CN108282090A (en) * | 2017-12-29 | 2018-07-13 | 河南北瑞电子科技有限公司 | A kind of flyback switch voltage-stabilized source |
| CN108365744A (en) * | 2018-01-03 | 2018-08-03 | 浙江正泰电器股份有限公司 | The IGBT drive circuit of frequency converter |
| CN109462331A (en) * | 2018-12-29 | 2019-03-12 | 重庆力华亘田科技有限责任公司 | A kind of auxiliary power circuit for general purpose engine |
| CN110417271A (en) * | 2019-07-24 | 2019-11-05 | 珠海银河耐吉科技股份有限公司 | A photovoltaic inverter drive circuit |
| CN111148334A (en) * | 2019-12-31 | 2020-05-12 | 河海大学常州校区 | Portable dry cell power supply DC corona sterilizing pen |
| CN111193408A (en) * | 2020-03-04 | 2020-05-22 | 深圳英飞源技术有限公司 | Mutual-feedback auxiliary power supply circuit |
| CN111193408B (en) * | 2020-03-04 | 2024-06-11 | 深圳英飞源技术有限公司 | Mutual feedback type auxiliary power supply circuit |
| CN112165256A (en) * | 2020-10-30 | 2021-01-01 | 杭州海兴电力科技股份有限公司 | DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter |
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| CF01 | Termination of patent right due to non-payment of annual fee |