CN104811048A - Temperature control push-pull converter - Google Patents

Temperature control push-pull converter Download PDF

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Publication number
CN104811048A
CN104811048A CN201510278672.3A CN201510278672A CN104811048A CN 104811048 A CN104811048 A CN 104811048A CN 201510278672 A CN201510278672 A CN 201510278672A CN 104811048 A CN104811048 A CN 104811048A
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CN
China
Prior art keywords
voltage
diode
switching
real
pull converter
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.)
Pending
Application number
CN201510278672.3A
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Chinese (zh)
Inventor
金涛
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.)
Xiangyang Jing Sheng Scientific And Technological Information Advisory Co Ltd
Original Assignee
Xiangyang Jing Sheng Scientific And Technological Information Advisory Co Ltd
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Priority to CN201510278672.3A priority Critical patent/CN104811048A/en
Publication of CN104811048A publication Critical patent/CN104811048A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current

Abstract

The invention discloses a temperature control push-pull converter, which comprises an input power supply Uin, a temperature control switch K, a switching device S1, a switching device S2, an isolation transformer T, a rectifier diode D1, a rectifier diode D2, a power inductor L, an energy storage capacitor C, a load R, an auxiliary coil Lau, a PWM (pulse width modulation) controller and an output voltage calculator, and the auxiliary coil Lau is coupled with the power inductor L. According to the measured voltage Udet of the auxiliary coil Lau, the primary winding turn number N1 and secondary winding turn number N2 of the isolation transformer T, input voltage Uin, the voltage drop of the rectifier diode D1 and the rectifier diode D2, the conduction time of the switching devices and the change Alpha of the auxiliary coil Lau coupled with the power inductor L, the output voltage calculator determines a real-time output value Uout of output voltage, whether the circuit operates or not is determined according to the working environment temperature of an electrical appliance, and according to the real-time output value, the PWM controller generates a PWM driving signal to control the on-off of the switching device S1 and the switching device S2.

Description

A kind of temperature control push-pull converter
[technical field]
The present invention relates to a kind of DC convertor, especially a kind of temperature control push-pull type DC convertor.
[background technology]
Because Switching Power Supply has the advantages such as high efficiency, small size, high reliability relative to conventional linear power supply, be applied to the fields such as computer, communication, electric power, household electrical appliances, instrument and Aero-Space more and more widely.When the Switching Power Supply of being powered by lead-acid battery and inverter, how to make that its efficiency is higher, volume is less and energy density is high, nowadays maximum topological structures adopt push-pull circuit topology, is characterized in adopting high frequency transformer, makes Switching Power Supply volume little high with power density; This type of topology is applicable to the application scenario of low pressure and big current simultaneously, is therefore widely used in the power-supply system such as uninterrupted power supply and sinewave inverter prime.The voltage and current stability that this kind of power-supply system exports depends on that prime exports the stability of high pressure to a great extent, no matter be that voltage monocycle controls or Double closed-loop of voltage and current, its basis is all that Voltage Feedback controls, output voltage is fed back in front controller by opto-coupled feedback circuit, add the complexity of system, the dynamic property reducing feedback causes can not accurately controlling (as shown in Figure 1).
[summary of the invention]
Technical problem to be solved by this invention, for the defect in aforementioned background art and deficiency, a kind of new push-pull converter is provided, its sampling does not rely on the additional sample measures such as optocoupler, be provided with temp control switch simultaneously, can system cost be reduced, improve the dynamic property of feedback and then realize accurate PWM and control.
Input power Uin hands over that directly to convert the direct voltage obtained also can be the direct voltage such as storage battery, lead-acid battery form, temperature detect switch (TDS) K connects input power Uin, described temperature detect switch (TDS) K links temperature probe, according to the temperature conditions control circuit break-make of probe feedback; Switching device S1, S2 are driven by PWM controller and carry out switch motion, it is the former limit that ac square-wave voltage is added in isolating transformer T by DC voltage conversion, a diode tube pressuring drop is only had at the vice-side winding of isolating transformer, the former limit umber of turn of isolating transformer is N1, the vice-side winding number of turn is N2, two switching device alternate conduction, in the interval that switching device is closed, as when switching device S1 conducting, diode D1 bears malleation and conducting, and D2 due to reverse bias by, during switching device S2 conducting, D2 conducting, D1 by.And in switching device closed area, the voltage at energy storage inductor L two ends is:
u L = N 2 N 1 U in - U D - U out - - - ( 1 )
When two switching devices turn off simultaneously, inductive current i lbe evenly distributed in two windings of isolating transformer secondary, now the voltage at energy storage inductor L two ends is:
u L＝-U D-U out(2)
Wherein, U dfor the voltage drop of rectifier diode D1, D2, U outfor output voltage;
Suppose that the no-load voltage ratio of the ancillary coil Lau be coupled with energy storage inductor L is α, the voltage of auxiliary winding is measuring voltage U det, u l=α U detso, output voltage can be expressed as
Switching tube opens period: U out = N 2 N 1 U in - U D - α U det ,
Switching tube blocking interval: U out=-U d-α U det;
Compared with prior art, useful effect of the present invention comprises:
A kind of temperature control push-pull converter provided by the invention by the real-time voltage of direct-detection energy storage inductor L, and according to the intrinsic parameter of transformer, input voltage and switching tube whether conducting can determine the situation of change of output voltage.The sampling of this push-pull converter does not rely on the additional sample measures such as optocoupler, can reduce system cost, improves the dynamic property of feedback and then realizes accurate PWM and control; , accurately controlled by the operating state of temperature detect switch (TDS) to converter meanwhile, ensure the device operating state of the driving of variator, thus reduce energy consumption, increase power.
[accompanying drawing explanation]
Fig. 1: the circuit controling drawing of existing push-pull converter;
Fig. 2: push-pull converter circuit structure diagram of the present invention;
Fig. 3: the output voltage account form figure that analog circuit realizes.
[embodiment]
For making technical scheme of the present invention clearly, below in conjunction with accompanying drawing and specific implementation process, the present invention is described in further detail.
As shown in Figure 2, this push-pull converter comprise input power Uin, two switching devices S1, S2, isolating transformer T, rectifier diode D1, D2, energy storage inductor L, storage capacitor C and load R, the ancillary coil Lau be coupled with energy storage inductor L, PWM controller and output voltage calculator.
Input power Uin hands over that directly to convert the direct voltage obtained also can be the direct voltage such as storage battery, lead-acid battery form, temperature detect switch (TDS) K connects input power Uin, described temperature detect switch (TDS) K is connected with temperature probe, according to the temperature conditions control circuit break-make of probe feedback, probe can use existing any temperature probe to carry out observing and controlling to equipment operating ambient temperature, when temperature exceedes set point, start push-pull converter, the voltage of equipment is controlled.
Switching device S1, S2 are driven by PWM controller and carry out switch motion, it is the former limit that ac square-wave voltage is added in isolating transformer T by DC voltage conversion, a diode tube pressuring drop is only had at the vice-side winding of isolating transformer, the former limit umber of turn of isolating transformer is N1, the vice-side winding number of turn is N2, two switching tube alternate conduction, in the interval that switch element is closed, as when switching tube S1 conducting, diode D1 bears malleation and conducting, and D2 due to reverse bias by, during switching tube S2 conducting, D2 conducting, D1 by.And in switch element closed area, can determine that the voltage at energy storage inductor L two ends is according to Kirchhoff's second law:
u L = N 2 N 1 U in - U D - U out - - - ( 1 )
When two switching tubes turn off simultaneously, inductive current i lbe evenly distributed in two windings of isolating transformer secondary, now the voltage at energy storage inductor L two ends is:
u L＝-U D-U out(2)
Wherein, U dfor the voltage drop of rectifier diode D1, D2, U outfor output voltage;
Suppose that the no-load voltage ratio of the ancillary coil Lau be coupled with energy storage inductor L is α, the voltage of auxiliary winding is measuring voltage U det, then, and u l=α U det, so, output voltage can be derived as:
Switching tube opens period: U out = N 2 N 1 U in - U D - α U det ,
Switching tube blocking interval: U out=-U d-α U det;
Therefore, by the real-time voltage of direct-detection energy storage inductor L, and according to the intrinsic parameter of transformer, input voltage and switching tube whether conducting can determine the situation of change of output voltage.
And above-mentioned relation can directly utilize the digital programmable of prior art to realize in PWM controller, also can be realized by the mode of analog circuit, as used subtracter, adder; When using analog circuit, whether subtracter uses can be controlled by a single-pole double-throw switch (SPDT), the control of single-pole double-throw switch (SPDT) is identical with the control impuls of switching tube, uses this level in switching tube conduction period, the positive input terminal direct ground connection of switching tube by period subtracter, as shown in Figure 3.Due to the U calculated outcontaining high order harmonic component, by low pass filter by after high order harmonic component filtering, will can obtain in real time output voltage accurately, then send in PWM controller the PWM drived control carrying out routine, and voltage close loop can be realized and control or Double closed-loop of voltage and current.
The push-pull converter of the above-mentioned controller of sample strip, its sampling does not rely on the additional sample measures such as optocoupler, can reduce system cost, improves the dynamic property of feedback and then realizes accurate PWM and control.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (6)

1. a temperature control push-pull converter, comprise input power Uin, temperature detect switch (TDS) K, two switching devices S1, S2, isolating transformer T, rectifier diode D1, D2, energy storage inductor L, storage capacitor C and load R, the ancillary coil Lau be coupled with energy storage inductor L, PWM controller and output voltage calculator, temperature detect switch (TDS) K connects input power Uin; Switching device S1, S2 are driven by PWM controller and carry out switch motion, it is the former limit that ac square-wave voltage is added in isolating transformer T by the DC voltage conversion of input power, a diode tube pressuring drop is only had at the vice-side winding of isolating transformer, two switching device alternate conduction, in the interval that switch element is closed, when switching tube S1 conducting, diode D1 bears malleation and conducting, and diode D2 due to reverse bias by, when switching tube S2 conducting, diode D2 conducting, diode D1 by; Output voltage calculator is according to the measuring voltage U of ancillary coil Lau det, the no-load voltage ratio α of ancillary coil Lau that is coupled of the former limit umber of turn N1 of isolating transformer T, vice-side winding number of turn N2, input voltage Uin, diode D1, D2 tube voltage drop, switch device conductive time and energy storage inductor L determines the real-time output valve Uout of output voltage, PWM controller produces according to this real-time output valve conducting or the shutoff that PWM drive singal comes control switch device S1, S2.
2. a kind of temperature control push-pull converter according to claim 1, the computing formula of wherein said real-time output valve Uout is:
Switching tube opens period: U out = N 2 N 1 U in - U D - α U det ,
Switching tube blocking interval: U out=-U d-α U det;
Wherein, U dfor the tube voltage drop of diode D1, D2, U detfor the measuring voltage of ancillary coil Lau.
3. a kind of temperature control push-pull converter according to claim 2, the digital programmable that is calculated as of wherein said real-time output valve Uout is realized or is realized by the mode of analog circuit.
4. push-pull converter according to claim 3, wherein should realize in the calculating of real-time output valve Uout by analog circuit, analog circuit is subtracter, and one of them input of subtracter adopts single-pole double throw to realize and with reference to the switching between ground, its switching frequency is consistent with the turn-on frequency of switching device.
5. a kind of temperature control push-pull converter according to claim 3, wherein said real-time output valve Uout as calculated afterwards by low pass filter by high order harmonic component filtering, filtered voltage is sent to PWM controller.
6. a kind of temperature control push-pull converter according to claim 1, described temperature detect switch (TDS) K links temperature probe, according to the temperature conditions control circuit break-make of probe feedback.
CN201510278672.3A 2014-12-13 2015-05-27 Temperature control push-pull converter Pending CN104811048A (en)

Priority Applications (1)

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CN201410806142 2014-12-13
CN2014108061427 2014-12-13
CN201510278672.3A CN104811048A (en) 2014-12-13 2015-05-27 Temperature control push-pull converter

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108513410A (en) * 2018-06-04 2018-09-07 深圳市华菱电源有限公司 LED switch power circuit and LED lamp
CN108880271A (en) * 2018-08-24 2018-11-23 广州致远电子有限公司 A kind of push-pull converter circuit and its control method
CN108923662A (en) * 2018-08-24 2018-11-30 广州致远电子有限公司 A kind of push-pull converter circuit and its control method
CN109067164A (en) * 2018-08-24 2018-12-21 广州致远电子有限公司 A kind of push-pull converter circuit and its control method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251857A (en) * 1979-02-21 1981-02-17 Sperry Corporation Loss compensation regulation for an inverter power supply
EP0484610A1 (en) * 1990-11-08 1992-05-13 BULL HN INFORMATION SYSTEMS ITALIA S.p.A. D.C. switching power supply having controlled voltage output and output isolation from the input
CN2838141Y (en) * 2005-07-05 2006-11-15 吐尔干·塔力甫 AC power supply system for automobile
CN200976486Y (en) * 2006-11-09 2007-11-14 东营新航机电科技有限公司 Numerical control synthetic protection monitoring instrument
CN201118452Y (en) * 2007-09-04 2008-09-17 江苏宏图高科技股份有限公司 High-voltage power switch power
CN201369872Y (en) * 2008-10-30 2009-12-23 华美电子股份有限公司 Intelligent power-saving automatic dimming electronic ballast
US20140028289A1 (en) * 2012-07-26 2014-01-30 Hamilton Sundstrand Space Systems International, Inc. Voltage sensing in isolated converters

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251857A (en) * 1979-02-21 1981-02-17 Sperry Corporation Loss compensation regulation for an inverter power supply
EP0484610A1 (en) * 1990-11-08 1992-05-13 BULL HN INFORMATION SYSTEMS ITALIA S.p.A. D.C. switching power supply having controlled voltage output and output isolation from the input
CN2838141Y (en) * 2005-07-05 2006-11-15 吐尔干·塔力甫 AC power supply system for automobile
CN200976486Y (en) * 2006-11-09 2007-11-14 东营新航机电科技有限公司 Numerical control synthetic protection monitoring instrument
CN201118452Y (en) * 2007-09-04 2008-09-17 江苏宏图高科技股份有限公司 High-voltage power switch power
CN201369872Y (en) * 2008-10-30 2009-12-23 华美电子股份有限公司 Intelligent power-saving automatic dimming electronic ballast
US20140028289A1 (en) * 2012-07-26 2014-01-30 Hamilton Sundstrand Space Systems International, Inc. Voltage sensing in isolated converters

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108513410A (en) * 2018-06-04 2018-09-07 深圳市华菱电源有限公司 LED switch power circuit and LED lamp
CN108880271A (en) * 2018-08-24 2018-11-23 广州致远电子有限公司 A kind of push-pull converter circuit and its control method
CN108923662A (en) * 2018-08-24 2018-11-30 广州致远电子有限公司 A kind of push-pull converter circuit and its control method
CN109067164A (en) * 2018-08-24 2018-12-21 广州致远电子有限公司 A kind of push-pull converter circuit and its control method

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Application publication date: 20150729

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