CN102386780A - Push-pull circuit of DC/DC (Direct Current/Direct Current) part - Google Patents
Push-pull circuit of DC/DC (Direct Current/Direct Current) part Download PDFInfo
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- CN102386780A CN102386780A CN2011102713419A CN201110271341A CN102386780A CN 102386780 A CN102386780 A CN 102386780A CN 2011102713419 A CN2011102713419 A CN 2011102713419A CN 201110271341 A CN201110271341 A CN 201110271341A CN 102386780 A CN102386780 A CN 102386780A
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Abstract
The invention suitable for the field of electronic circuit provides a push-pull circuit of a DC/DC (Direct Current/Direct Current) part, which comprises a boosting transformer and a primary switch tube as well as a voltage doubling rectifying circuit connected with the output ends of the boosting transformer and the primary switch tube; the output end of the voltage doubling rectifying circuit is connected with an output filter and energy storage circuit and a current detection unit; the output end of the filter and energy storage circuit is connected with a voltage/detection unit; the output ends of the current detection unit and the voltage/detection unit are both connected with a multi-signal feedback sampling unit; the multi-signal feedback sampling unit is connected to a controller; the controller is provided with a storage device and a communication interface, and the output end of the controller is connected with a driver; the driver is connected with the boosting transformer and the primary switch tube; and the input end of the controller is also connected with an input voltage detection unit and auxiliary power. In this way, output performance index, power conversion efficiency and temperature rise performance index of the digital push-pull circuit are improved.
Description
Technical field
The invention belongs to electronic circuit field, relate in particular to a kind of push-pull circuit of DC/DC part.
Background technology
The DC/DC part generally adopts push-pull topology in the small-power ups power, convert the input of 400V left and right sides busbar voltage as back level inversion into than low battery voltages.If only control the output voltage of push-pull converter, because of its load is an inverter, so input current is for existing the low-frequency current fluctuation of 2 times of reverse frequencies with Voltage loop.This fluctuation can cause the voltage of former limit switching tube, current stress excessive, reduces transducer effciency, increases temperature rise.For avoiding these shortcomings, needing increases electric current loop, and making input current is direct current.
Existing push-pull converter electric current loop sampling roughly comprises following three kinds: resistance-type, Hall current sensor formula, Wound-rotor type are arranged, shown in Fig. 1～3 all on former limit.
Consult Fig. 1, be resistance-type, the occasion that its suitable electric current is less, and the former limit switching tube electric current of push-pull circuit often reaches tens amperes even ampere up to a hundred in the UPS application.If adopt the sample rate current of this mode, resistance loss is bigger, and needs to cooperate high precision operating amplifier that millivolt step voltage sampled signal is amplified, and receives the interference of switching noise easily; The overall cost of big current sampling resistor and high precision operating amplifier is higher; PCB layout is also difficult.
Consult Fig. 2, be the Hall current sensor formula, transducer of its need just can be accomplished the current sample desired signal, loss is little, but cost is too high, and the small-power ups power strict for cost requirement almost is unacceptable.
Consult Fig. 3, be Wound-rotor type, it needs magnetic reset and demagnetization time, and its cost is lower.When underloading, can realize the current signal sampling preferably.But because of the approaching full duty ratio of current signal, transducer can not effectively demagnetize and reset at battery low pressure, load full load, so can not gamut realize current loop control.
In sum, there is following shortcoming in the primary current Sampling techniques of the push-pull circuit of DC/DC part in the existing small-power ups power:
1, big, the complex structure of resistance-type sampling loss, PCB layout difficulty, cost is higher, only is suitable for and the less occasion of input current;
2, the Hall current sensor formula can satisfy the current sample demand, but cost is too high.Be difficult to practical based on cost consideration;
3, the Wound-rotor type cost is minimum.But it needs magnetic reset, and circuit malfunction near full duty ratio the time can not be realized current sample in the gamut.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of the embodiment of the invention is to provide a kind of push-pull circuit of DC/DC part.
The embodiment of the invention is achieved in that a kind of push-pull circuit of DC/DC part, and said push-pull circuit comprises:
Step-up transformer and former limit switching tube; The voltage doubling rectifing circuit that links to each other with said step-up transformer and former limit switching tube output; The output of said voltage doubling rectifing circuit links to each other with output filtering and accumulator, current detecting unit respectively; The output of said filtering and accumulator links to each other with voltage/detecting unit, and the output of said current detecting unit, voltage/detecting unit all links to each other with many signal feedback sampling unit, and said many signal feedback sampling unit is connected to controller; Said controller self-contained storing devices and communication interface; And the output of said controller links to each other with driver, and said driver connects step-up transformer and former limit switching tube, and the input of said controller also links to each other with input voltage detecting unit, accessory power supply.
Further, the power bracket 500W-3000W of said UPS.
Further, being input as below the cell voltage 100V of said digitlization push-pull circuit, output voltage is 400V, as the input voltage of back level inverter.
Further, the operating frequency of said digitlization push-pull circuit is 30kHz～100kHz, and the former and deputy limit of transformer is one group of tapped winding of band.
Further, said controller is realized Digital Control function and management function by dsp chip.
Further, said drive circuit is the drive circuit of switch mosfet pipe, perhaps forms the power amplification drive circuit by PNP and NPN triode by isolating transformer.
Further, said communication interface is the UART communication interface.
Further, affiliated parameter storage is the eeprom memory chip.
In an embodiment of the present invention, conversion efficiency, temperature rise performance index that on basis cheaply, causes output performance index, the power supply of digitlization push-pull circuit etc. is improved, and be easy to use, and higher practical commercial value is arranged.
Description of drawings
Fig. 1 is the resistance-type primary current sampling principle figure that prior art provides;
Fig. 2 is the Hall current sensor formula primary current sampling principle figure that prior art provides;
Fig. 3 is the Wound-rotor type primary current sampling principle figure that prior art provides;
Fig. 4 be one embodiment of the invention provide secondary current sampling principle figure;
Fig. 5 is the structured flowchart of the secondary current sampled, digital push-pull circuit that provides of one embodiment of the invention;
Fig. 6 is the functional block diagram of the controller that provides of one embodiment of the invention;
Fig. 7 is the circuit diagram that another embodiment of the present invention provides.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Consult Fig. 4-7, wherein, Fig. 4 shows secondary current sampling principle provided by the invention,
Voltage multiplying rectifier is adopted in this digitlization push-pull circuit output, the electric current of the corresponding outputting inductance L1 of current sample CT1, the electric current of the corresponding outputting inductance L2 of current sample CT2.Because be output as high pressure (about 400V), so sample rate current less (the UPS electric current of 1KW has only about 3A, and the UPS electric current of 3KW also is no more than 10A), two extremely low Wound-rotor type CT of cost can meet the demands.The maximum duty cycle that flows through electric current among each CT is 50%, and the sufficient magnetic reset time is arranged, and problem, the problem includes: the magnetic saturation problem when having avoided former limit Wound-rotor type CT to sample fully.Three kinds of modes that cost contrasts the big current sample in former limit reduce significantly.
In the present invention, digitlization is recommended power supply and is adopted voltage, the control of electric current dicyclo.Voltage, the current stress of former limit switching tube do not have low-frequency fluctuation.Can select low withstand voltage MOSFET for use, further reduce cost.Voltage, current stress reduce to help to reduce the loss of power, improve power-efficient.The temperature rise of former limit MOSFET, transformer all has greatly improved.Can select the less fan of rotating speed for use, this helps to reduce the power supply cost on the one hand, helps to reduce the noise of power supply on the other hand.
Output adopts the method by week control to realize voltage stabilizing; So output voltage and electric current minimum will once sampling in one-period; Sampled signal is input in the pid control algorithm after making difference with fiducial value and calculates the duty ratio of the next switch periods of asking in that controller is inner.There is certain Dead Time between the switching tube of former limit, and can revises Dead Time according to the different qualities of practical devices.
When output voltage overvoltage or output current overcurrent, control signal is closed, and when the down periods detect unusual disappearance, restarts.But output voltage exact value, output over-voltage protection value and output overcurrent protection value are according to user's request on-line setup within the specific limits.
The push-pull circuit of DC/DC part comprises: step-up transformer and former limit switching tube; The voltage doubling rectifing circuit that links to each other with said step-up transformer and former limit switching tube output; The output of said voltage doubling rectifing circuit links to each other with output filtering and accumulator, current detecting unit respectively; The output of said filtering and accumulator links to each other with voltage/detecting unit, and the output of said current detecting unit, voltage/detecting unit all links to each other with many signal feedback sampling unit, and said many signal feedback sampling unit is connected to controller; Said controller self-contained storing devices and communication interface; And the output of said controller links to each other with driver, and said driver connects step-up transformer and former limit switching tube, and the input of said controller also links to each other with input voltage detecting unit, accessory power supply.
Wherein, Main power topology comprises former limit switching tube, step-up transformer, voltage doubling rectifing circuit and output filtering accumulator; Be the main body and the hardware foundation of power work, mainly accomplish the energy conversion, transmission of power supply, than the voltage transitions of large velocity ratio and the input of power supply, output are isolated each other; The functional schematic of controller is as shown in Figure 6, and this is the master controller of module, accomplishes the sampling of output voltage and output current signal to realize dicyclo control and protection control, controller parameter configuration and communication function; Drive circuit is accomplished the power amplification of the duty cycle signals of switching tube; Voltage and current detecting passage are accomplished the sample circuit of input voltage, output voltage and output current and are amplified; Feedback and sampling channel receive the signal of sense channel, and carry out time sharing sampling, send into controller; Auxiliary source is respectively controller, the drive circuit of former limit and secondary, the amplifier power supply of testing circuit; The communication interface of digitlization push-pull circuit adopts the RS232 communication protocol of standard, can realize the online modification of power parameter; The data of parameter storage received communication interface are also upgraded and preservation, and power supply reads in parameter when powering at every turn and is configured.
As embodiments of the invention, the push-pull circuit of this DC/DC part can also be as shown in Figure 7, in this circuit, mainly is that current sample is placed on the ground wire place.This mode only is applicable to that output connects the situation of inverter, and during the control of univoltage ring, this place's electric current is the sine wave of inverter frequency.The square wave that this place's current waveform is an inverter frequency when voltage, the control of electric current dicyclo.
In an embodiment of the present invention, said digitlization push-pull circuit be input as cell voltage (100V below), output voltage is about 400V, as the input voltage of back level inverter.Belong to the low-voltage, high-current input, high voltage-small current output;
In an embodiment of the present invention, the operating frequency of said digitlization push-pull circuit is 30kHz～100kHz, and the former and deputy limit of transformer is one group of tapped winding of band.
In an embodiment of the present invention, said controller is realized Digital Control function and management function by dsp chip.
In an embodiment of the present invention, said drive circuit is the drive circuit of switch mosfet pipe, perhaps only forms the power amplification drive circuit by PNP and NPN triode by isolating transformer.
In an embodiment of the present invention, said communication interface is the UART communication interface, and the communication level conversion is not included in this circuit.
At embodiments of the invention, affiliated parameter storage is the eeprom memory chip.
Technique scheme of the present invention causes conversion efficiency, temperature rise performance index of output performance index, the power supply of digitlization push-pull circuit etc. to be improved on basis cheaply, and is easy to use, and higher practical commercial value is arranged.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the push-pull circuit of DC/DC part is characterized in that said push-pull circuit comprises:
Step-up transformer and former limit switching tube; The voltage doubling rectifing circuit that links to each other with said step-up transformer and former limit switching tube output; The output of said voltage doubling rectifing circuit links to each other with output filtering and accumulator, current detecting unit respectively; The output of said filtering and accumulator links to each other with voltage/detecting unit, and the output of said current detecting unit, voltage/detecting unit all links to each other with many signal feedback sampling unit, and said many signal feedback sampling unit is connected to controller; Said controller self-contained storing devices and communication interface; And the output of said controller links to each other with driver, and said driver connects step-up transformer and former limit switching tube, and the input of said controller also links to each other with input voltage detecting unit, accessory power supply.
2. the push-pull circuit of DC/DC according to claim 1 part is characterized in that, being input as below the cell voltage 100V of said digitlization push-pull circuit, and output voltage is 400V, as the input voltage of back level inverter.
3. the push-pull circuit of DC/DC part according to claim 1 is characterized in that the operating frequency of said digitlization push-pull circuit is 30kHz～100kHz, and the former and deputy limit of transformer is one group of tapped winding of band.
4. the push-pull circuit of DC/DC part according to claim 1 is characterized in that said controller is realized Digital Control function and management function by dsp chip.
5. the push-pull circuit of DC/DC part according to claim 1 is characterized in that said drive circuit is the drive circuit of switch mosfet pipe, perhaps forms the power amplification drive circuit by PNP and NPN triode by isolating transformer.
6. the push-pull circuit of DC/DC part according to claim 1 is characterized in that said communication interface is the UART communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102713419A CN102386780A (en) | 2011-09-14 | 2011-09-14 | Push-pull circuit of DC/DC (Direct Current/Direct Current) part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102713419A CN102386780A (en) | 2011-09-14 | 2011-09-14 | Push-pull circuit of DC/DC (Direct Current/Direct Current) part |
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| CN102386780A true CN102386780A (en) | 2012-03-21 |
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| CN2011102713419A Pending CN102386780A (en) | 2011-09-14 | 2011-09-14 | Push-pull circuit of DC/DC (Direct Current/Direct Current) part |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868143A (en) * | 2012-10-12 | 2013-01-09 | 广东易事特电源股份有限公司 | Overcurrent protection circuit of push-pull converter |
| CN106771489A (en) * | 2016-12-22 | 2017-05-31 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converters method for detecting output current and device |
| CN107769580A (en) * | 2017-11-16 | 2018-03-06 | 陕西航空电气有限责任公司 | A kind of improvement push-pull converter based on sliding formwork control |
| CN109950968A (en) * | 2019-03-15 | 2019-06-28 | 深圳市海浦蒙特科技有限公司 | Elevator emergency power supply unit |
| TWI680637B (en) * | 2018-02-13 | 2019-12-21 | 大陸商昂寶電子（上海）有限公司 | Analog demagnetization sampling method and system for switching power supply output sampling |
| CN112564457A (en) * | 2019-09-10 | 2021-03-26 | 中车株洲电力机车研究所有限公司 | Current transformation system and power supply circuit of IGBT driving device |
Citations (3)
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| JPH053678A (en) * | 1991-06-25 | 1993-01-08 | Toshiba F Ee Syst Eng Kk | Dc/ac power supply |
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| JP2005086936A (en) * | 2003-09-10 | 2005-03-31 | Honda Motor Co Ltd | Dc/dc converter |
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Patent Citations (3)
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| JPH053678A (en) * | 1991-06-25 | 1993-01-08 | Toshiba F Ee Syst Eng Kk | Dc/ac power supply |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868143A (en) * | 2012-10-12 | 2013-01-09 | 广东易事特电源股份有限公司 | Overcurrent protection circuit of push-pull converter |
| CN102868143B (en) * | 2012-10-12 | 2015-10-21 | 广东易事特电源股份有限公司 | A kind of overcurrent protection circuit of push-pull converter |
| CN106771489A (en) * | 2016-12-22 | 2017-05-31 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converters method for detecting output current and device |
| CN107769580A (en) * | 2017-11-16 | 2018-03-06 | 陕西航空电气有限责任公司 | A kind of improvement push-pull converter based on sliding formwork control |
| CN107769580B (en) * | 2017-11-16 | 2019-12-31 | 陕西航空电气有限责任公司 | Improved push-pull converter based on sliding mode control |
| TWI680637B (en) * | 2018-02-13 | 2019-12-21 | 大陸商昂寶電子（上海）有限公司 | Analog demagnetization sampling method and system for switching power supply output sampling |
| CN109950968A (en) * | 2019-03-15 | 2019-06-28 | 深圳市海浦蒙特科技有限公司 | Elevator emergency power supply unit |
| CN112564457A (en) * | 2019-09-10 | 2021-03-26 | 中车株洲电力机车研究所有限公司 | Current transformation system and power supply circuit of IGBT driving device |
| CN112564457B (en) * | 2019-09-10 | 2021-09-21 | 中车株洲电力机车研究所有限公司 | Current transformation system and power supply circuit of IGBT driving device |
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Application publication date: 20120321 |