CN105450032A - Leakage inductance energy feedback digital control device for DC-DC converter - Google Patents
Leakage inductance energy feedback digital control device for DC-DC converter Download PDFInfo
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- CN105450032A CN105450032A CN201511020395.2A CN201511020395A CN105450032A CN 105450032 A CN105450032 A CN 105450032A CN 201511020395 A CN201511020395 A CN 201511020395A CN 105450032 A CN105450032 A CN 105450032A
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- 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
- H02M3/3353—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 having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/342—Active non-dissipative snubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a leakage inductance energy feedback digital control device for a DC-DC converter. A microcontroller controls two DC-DC converter circuits and two leakage inductance energy absorbing feedback circuits according to the data provided by an output voltage and current detection circuit, the second leakage inductance energy absorbing feedback circuit works when the first DC-DC converter circuit works, the first leakage inductance energy absorbing feedback circuit works when the second DC-DC converter circuit works, that is, a leakage inductance energy absorbing feedback circuit absorbs leakage inductance energy generated by a corresponding transformer in either working mode and feeds back the absorbed leakage inductance energy to an input direct-current power supply before the working mode is switched. The device absorbs spike voltage generated by a switching tube, absorbs the leakage inductance energy generated by the transformer and feeds back the leakage inductance energy, thus improving the conversion efficiency, reducing or eliminating heat emitted by the switching tube and prolonging the service life of the switching tube.
Description
Technical field
The present invention relates to field of switch power, be specifically related to DC-DC converter leakage inductance energy feedback numerical control device.
Background technology
Switching Power Supply is widely used, and the development of high frequency switch transformer makes that the volume of Switching Power Supply is less, weight is lighter, efficiency is higher.High frequency switch transformer is applied in Switching Power Supply, for transferring energy, isolation and no-load voltage ratio etc.Using, the DC-DC converter medium-high frequency switch transformer of transformer is very large to the performance impact of power supply: DC-DC converter medium-high frequency switch transformer leakage inductance can make switching tube produce back electromotive force in the moment disconnected, and causes switching tube over-voltage breakdown; Switching tube internal resistance in switch transition process is comparatively large, generates heat relatively seriously, loss is comparatively large and the life-span is short when flowing through larger leakage inductance electric current; Leakage inductance can also form oscillation circuit with the distributed capacitance of the distributed capacitance in circuit and transformer coil, makes circuit produce vibration and outside radiated electromagnetic energy, causes electromagnetic interference.Common solution adds absorption circuit to suppress the peak voltage of switching tube, as RC absorbing circuit, RCD clamp circuit etc., the shortcoming of RC absorbing circuit and RCD clamp circuit is the static exciter energy consuming energy and the DC-DC converter accumulated in the transformer leakage inductance of DC-DC converter, reduce the conversion efficiency of DC-DC converter, also can because turn-on consumption is comparatively large and can not feedback leakage inductance electric current, cause absorbing components and parts heating and reduction of service life.
Summary of the invention
The invention provides DC-DC converter leakage inductance energy feedback numerical control device, the absorption circuit conversion efficiency solving existing DC-DC converter is low, absorb short problem in components and parts useful life.
The present invention solves the problem by the following technical programs:
DC-DC converter leakage inductance energy feedback numerical control device, same as the prior art, comprise input DC power, the first DC-DC conversion circuit, the second DC-DC conversion circuit, described first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel, composition crisscross parallel DC-DC converter, the output of described input DC power is connected with the input of crisscross parallel DC-DC converter, the described output of crisscross parallel DC-DC converter is connected with the input of external loading, and difference from prior art is:
Also comprise microcontroller, output voltage current detection circuit, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit;
The input of described output voltage current detection circuit is connected with the output of crisscross parallel DC-DC converter; The described output of output voltage current detection circuit is connected with the input of microcontroller; The output of described microcontroller is connected with the control end of crisscross parallel DC-DC converter, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit respectively; The input of described first leakage inductance energy absorption feedback circuit is connected with the output of the first DC-DC conversion circuit, and the described output of the first leakage inductance energy absorption feedback circuit is connected with the input of input DC power; The input of described second leakage inductance energy absorption feedback circuit is connected with the output of the second DC-DC conversion circuit, and the described output of the second leakage inductance energy absorption feedback circuit is connected with the input of input DC power.
In such scheme, further comprise front stage circuits; The input of described front stage circuits is connected with the output of input DC power, and the output of described front stage circuits is connected with the input of crisscross parallel DC-DC converter.
In such scheme, further comprise output filter circuit; The input of described output filter circuit is connected with the output of crisscross parallel DC-DC converter, the output of described output filter circuit is connected with external loading, and the output of described output filter circuit is connected with the input of microcontroller through output voltage current detection circuit.
In such scheme, further comprise switch tube driving circuit; The input of described switch tube driving circuit is connected with the output of microcontroller, and the output of described switch tube driving circuit is connected with the control end of crisscross parallel DC-DC converter, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit respectively.
In such scheme, further comprise accessory power supply; The output of described accessory power supply is connected with the feeder ear of microcontroller, output voltage current detection circuit and switch tube driving circuit.
In such scheme, described first leakage inductance energy absorption feedback circuit is identical with the circuit structure of the second leakage inductance energy absorption feedback circuit; Described first leakage inductance energy absorption feedback circuit is made up of switching tube Q1, switching tube Q2, switching tube Q3, electric capacity C1, electric capacity C2, diode D1 and inductance L 1; The drain electrode of described switching tube Q3 is connected with the first DC-DC conversion circuit, and the source electrode of described switching tube Q3 is connected with the drain electrode of switching tube Q2, and the source electrode of described switching tube Q3 is connected with the source electrode of switching tube Q1 through electric capacity C2; The source electrode of described switching tube Q2 is connected through the drain electrode of inductance L 1 with switching tube Q1; The source ground of described switching tube Q1, after the drain electrode of described switching tube Q1 is connected with diode D1, is connected with the source electrode of switching tube Q1 through electric capacity C1; The described negative pole of diode D1 is connected with the positive pole of input DC power; The grid of described switching tube Q1, switching tube Q2, switching tube Q3 is connected with microcontroller.
In such scheme, described first DC-DC conversion circuit is identical with the circuit structure of the second DC-DC conversion circuit;
Described first DC-DC conversion circuit is made up of switching tube Q4, transformer T1 and diode D3;
The Same Name of Ends of described transformer T1 armature winding N1 is connected with the output of input DC power, the different name end of described transformer T1 armature winding N1 is connected with the drain electrode of the switching tube Q3 of the first leakage inductance energy absorption feedback circuit, the different name end of described transformer T1 armature winding N1 is connected with the drain electrode of switching tube Q4, and the Same Name of Ends of described transformer T1 secondary winding N2 is connected with a road input of external loading through diode D3; The described source electrode of switching tube Q4 is connected with the negative pole of input DC power, and the grid of described switching tube Q4 is connected with microcontroller; The transformer T1 of described first DC-DC conversion circuit is connected with the Same Name of Ends of primary winding in the second DC-DC conversion circuit; In described first DC-DC conversion circuit, the different name end of transformer T1 secondary winding is connected with the different name end of transformer secondary output winding in the second DC-DC conversion circuit, and described two different name ends are all connected with another road input of external loading; Described first DC-DC conversion circuit is connected with the negative electrode of two diodes of the second DC-DC conversion circuit.
Advantage of the present invention and effect are:
1, according to the data that output voltage current detection circuit detects, control two DC-DC conversion circuit and two leakage inductance energy absorption feedback circuits, first DC-DC conversion circuit for external loading energy is provided time, second leakage inductance energy absorption feedback circuit absorbs the leakage inductance energy that the second DC-DC conversion circuit produces, second DC-DC conversion circuit for external loading energy is provided time, first leakage inductance energy absorption feedback circuit absorbs the leakage inductance energy that the first DC-DC conversion circuit produces, and before two kinds of working methods switch, the leakage inductance energy of absorption is fed back to input DC power, not only improve conversion efficiency of the present invention but also solve short problem in components and parts useful life,
2, prime filtering and anti-reverse protection are carried out to input DC power, after rear class filtering is carried out to the output of two DC-DC conversion circuit, then input to external loading, for external loading provides stable signal, improve the stability of circuit.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of crisscross parallel DC-DC converter of the present invention and two leakage inductance energy absorption feedbacks.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to these embodiments.
The invention discloses a kind of DC-DC converter leakage inductance energy feedback numerical control device, same as the prior art, comprise input DC power and crisscross parallel DC-DC converter, wherein, crisscross parallel DC-DC converter is connected in parallel by the first DC-DC conversion circuit and the second DC-DC conversion circuit and forms, the output of input DC power is connected with the input of crisscross parallel DC-DC converter, the output of crisscross parallel DC-DC converter is connected with the input of external loading, and difference from prior art is:
Also comprise microcontroller, output voltage current detection circuit, the first leakage inductance energy absorption feedback circuit, the second leakage inductance energy absorption feedback circuit and switch tube driving circuit; The input of output voltage current detection circuit is connected with the output of crisscross parallel DC-DC converter; The output of output voltage current detection circuit is connected with the input of microcontroller; The output of microcontroller is connected with the control end of crisscross parallel DC-DC converter, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit respectively; The input of the first leakage inductance energy absorption feedback circuit is connected with the output of the first DC-DC conversion circuit, and the output of the first leakage inductance energy absorption feedback circuit is connected with the input of input DC power; The input of the second leakage inductance energy absorption feedback circuit is connected with the output of the second DC-DC conversion circuit, and the output of the second leakage inductance energy absorption feedback circuit is connected with the input of input DC power; The input of switch tube driving circuit is connected with the output of microcontroller, and the output of switch tube driving circuit is connected with the control end of two DC-DC conversion circuit and two leakage inductance energy absorption feedback circuits respectively.
The voltage and current that output voltage current detection circuit detects by microcontroller carries out A/D conversion, existing Kalman Algorithm is used to carry out Kalman filtering, use existing pid algorithm process again, carry out leakage inductance energy feedback and PID control, pwm signal is sent by built-in pwm signal generator, namely by changing pulse width modulation duty ratio, control the work of crisscross parallel DC-DC converter and two leakage inductance energy absorption feedback circuits, and then control whole DC-DC converter leakage inductance energy feedback numerical control device externally load stable direct current signal is provided, realize closed-loop control.Microcontroller is monitored in real time to this device, has the advantages such as intellectuality, efficiency are high, wide region input.Microcontroller of the present invention adopts STM32F407, has the feature of high-performance, low cost, low-power consumption.Pwm signal generator sends pwm signal, by changing pulse width modulation duty ratio, to drive crisscross parallel DC-DC converter and two leakage inductance energy absorption feedback circuits.In the present invention, pwm signal generator sends 8 road pwm signal, i.e. PWM1-PWM8, for controlling the switching tube of crisscross parallel DC-DC converter and two leakage inductance energy absorption feedback circuits.
First leakage inductance energy absorption feedback circuit is made up of switching tube Q1, switching tube Q2, switching tube Q3, electric capacity C1, electric capacity C2, diode D1 and inductance L 1; Second leakage inductance energy absorption feedback circuit is made up of switching tube Q5, switching tube Q6, switching tube Q7, electric capacity C3, electric capacity C4, diode D2 and inductance L 2; First leakage inductance energy absorption feedback circuit is identical with the circuit structure of the second leakage inductance energy absorption feedback circuit.The drain electrode of switching tube Q3 is connected with the different name end of transformer T1 armature winding in the first DC-DC conversion circuit, and the source electrode of switching tube Q3 is connected with the drain electrode of switching tube Q2, and the source electrode of switching tube Q3 is connected with the source electrode of switching tube Q1 through electric capacity C2, the source electrode of switching tube Q2 is connected through the drain electrode of inductance L 1 with switching tube Q1, the source ground of switching tube Q1, after the drain electrode of switching tube Q1 is connected with diode D1, is connected with the source electrode of switching tube Q1 through electric capacity C1, the negative pole of diode D1 is connected with the positive pole of input DC power, switching tube Q1, switching tube Q2, the grid of switching tube Q3 is connected with microcontroller by switch tube driving circuit, the i.e. PWM1 of the pwm signal generator output of microcontroller, PWM2, PWM3 is by inputing to switching tube Q1 respectively after switch tube driving circuit, switching tube Q2, the grid of switching tube Q3, in like manner, switching tube Q5, switching tube Q6, the grid of switching tube Q7 is connected with microcontroller by switch tube driving circuit, the i.e. PWM5 of the pwm signal generator output of microcontroller, PWM6, PWM7 is by inputing to switching tube Q5 respectively after switch tube driving circuit, switching tube Q6, the grid of switching tube Q7.
In the first leakage inductance energy absorption feedback circuit, electric capacity C2 is storage capacitor, and inductance L 1 is energy storage inductor, and diode D1 is fly-wheel diode, and electric capacity C1 is filter capacitor.Electric capacity C2 is used for when switching tube Q4 disconnects, and stores the leakage inductance energy that transformer T1 produces; Switching tube Q1, diode D1, electric capacity C1 and inductance L 1 form switch DC booster circuit 1, for the magnitude of voltage that boost capacitor C2 provides.Electric capacity hinders change in voltage, logical high frequency, resistance low frequency, logical interchange, resistance direct current; Inductive obstacle curent change, logical low frequency, resistance high frequency, logical direct current, resistance exchange.Ideally, the voltage that provides of the magnitude of voltage of storage capacitor C2 and the leakage inductance of transformer T1.When switching tube Q4 closes, there is leakage inductance energy in transformer T1, switching tube Q2 closes, and switching tube Q3 opens, and transformer T1 is charged to storage capacitor C2 by switching tube Q3, absorbs the leakage inductance energy of transformer T1 in storage capacitor C2; Switching tube Q3 closes, and switching tube Q2 opens, and the energy of storage capacitor C2 feeds back in input DC power after switch DC booster circuit 1 boosts.In like manner, in the second leakage inductance energy absorption feedback circuit, storage capacitor C4 is used for when switching tube Q8 disconnects, and stores the leakage inductance energy that transformer T2 produces; Switching tube Q5, sustained diode 2, filter capacitor C1 and energy storage inductor L2 form switch DC booster circuit 2, for raising the magnitude of voltage that storage capacitor C4 provides.When switching tube Q8 closes, there is leakage inductance energy in transformer T2, switching tube Q6 closes, and switching tube Q7 opens, and transformer T2 is charged to storage capacitor C4 by switching tube Q7, absorbs the leakage inductance energy of transformer T2 in storage capacitor C4; Switching tube Q7 closes, and switching tube Q6 opens, and the energy of storage capacitor C4 feeds back in input DC power after switch DC booster circuit 2 boosts.Two leakage inductance energy absorption feedback circuits eliminate the peak voltage that the disconnection due to switching tube Q4, switching tube Q8 causes respectively, and the exciting current leakage inductance energy produced by transformer T1, T2 is carried out absorbing and feeding back in input DC power, improve conversion efficiency of the present invention, reduce or eliminate switching tube Q4, switching tube Q8 to generate heat, extend the useful life of each device, improve circuit reliability, complicated interference environment can be adapted to.
First DC-DC conversion circuit is made up of switching tube Q4, transformer T1 and diode D3; Second DC-DC conversion circuit is made up of switching tube Q8, transformer T2 and diode D4; First DC-DC conversion circuit is identical with the circuit structure of the second DC-DC conversion circuit.In the first DC-DC conversion circuit, the Same Name of Ends of transformer T1 armature winding N1 is connected with the output of input DC power, the different name end of transformer T1 armature winding N1 is connected with the drain electrode of the switching tube Q3 of the first leakage inductance energy absorption feedback circuit, the different name end of transformer T1 armature winding N1 is connected with the drain electrode of switching tube Q4, and the Same Name of Ends of transformer T1 secondary winding N2 is connected with a road input of external loading through diode D3; The source electrode of switching tube Q4 is connected with the negative pole of input DC power, and the grid of switching tube Q4 is connected with microcontroller, and the PWM4 signal that namely the pwm signal generator of microcontroller exports inputs to the grid of switching tube Q4; The transformer T1 of the first DC-DC conversion circuit is connected with the Same Name of Ends of the armature winding of the transformer T2 of the second DC-DC conversion circuit; In first DC-DC conversion circuit, the different name end of transformer T1 secondary winding is connected with the different name end of transformer T2 secondary winding in the second DC-DC conversion circuit, and two different name ends are connected with another road input of external loading; Diode D3 is connected with the negative electrode of diode D4.After input DC power is carried out isolated variable by the first DC-DC conversion circuit and the second DC-DC conversion circuit, by Energy Transfer to external loading.The armature winding of transformer T1 is consistent with secondary winding direction, and to rise around point be Same Name of Ends, and Same Name of Ends any instant two windings under the effect of same alternating flux all have same potential polarity; The winding mode of transformer T2 is identical with transformer T1.The grid of the second DC-DC conversion circuit breaker in middle pipe Q8 is connected with microcontroller, and the PWM8 signal that namely the pwm signal generator of microcontroller exports inputs to the grid of switching tube Q8.
Microprocessor controls first DC-DC conversion circuit switching tube Q4 opens, control the second DC-DC conversion circuit switching tube Q8 to close, the switching tube Q3 controlling the first leakage inductance energy absorption feedback circuit closes, control switch pipe Q2 opens, the switching tube Q7 controlling the second leakage inductance energy absorption feedback circuit opens, switching tube Q6 closes, the first DC-DC conversion circuit conducting and externally load energy is provided, the second DC-DC conversion circuit disconnects and stops externally load to provide energy; Microprocessor controls second DC-DC conversion circuit switching tube Q8 opens, control the first DC-DC conversion circuit switching tube Q4 to close, the switching tube Q7 controlling the second leakage inductance energy absorption feedback circuit closes, control switch pipe Q6 opens, the switching tube Q3 controlling the first leakage inductance energy absorption feedback circuit opens, switching tube Q2 closes, the second DC-DC conversion circuit conducting and externally load energy is provided, the first DC-DC conversion circuit disconnects and stops externally load to provide energy.Above-mentioned two courses of work are staggered carries out.
Front stage circuits is provided with between input DC power and crisscross parallel DC-DC converter, the input of front stage circuits is connected with the output of input DC power, the output Vin of front stage circuits is connected with the input of crisscross parallel DC-DC converter, is namely connected with the Same Name of Ends of the armature winding of transformer T1, transformer T2.The signal that front stage circuits is used for input DC power exports carries out filtering and anti-reverse protection.
Output filter circuit is provided with between crisscross parallel DC-DC converter and external loading, the input of output filter circuit is connected with the output end vo of crisscross parallel DC-DC converter, the output of output filter circuit is connected with external loading, and the output of output filter circuit is connected with the input of microcontroller through output voltage current detection circuit.Output filter circuit inputs to external loading after being used for that the signal that crisscross parallel DC-DC converter exports is carried out filtering.
In microcontroller and two DC-DC conversion circuit and two leakage inductance energy absorption feedback circuits each switching tube grid between, be provided with switch tube driving circuit, the output of switch tube driving circuit is connected with the grid of each switching tube in two DC-DC conversion circuit and two leakage inductance energy absorption feedback circuits respectively.Switch tube driving circuit, for after the small-signal of amplifying the built-in middle pwm signal generator of microcontroller and producing, drives opening of each switching tube.
The present invention is also provided with accessory power supply, and the output of accessory power supply is connected with the feeder ear of microcontroller, output voltage current detection circuit and switch tube driving circuit, for being above-mentioned three circuit supplies.
The course of work of the present invention is:
Microcontroller produces different pwm signals according to the signal that output voltage current detection circuit detects, by controlling opening and disconnecting of each switching tube, interlocking and carrying out following two kinds of working methods:
1, microcontroller sends pwm signal, opens switching tube Q4 by switch tube driving circuit, cut-off switch pipe Q8, so control the first DC-DC conversion circuit externally load energy is provided; Cut-off switch pipe Q3, opens switching tube Q2, by the energy feedback of storage capacitor C2 in input DC power; Open switching tube Q7 and cut-off switch pipe Q6 in second leakage inductance energy absorption feedback circuit simultaneously, absorb by storage capacitor C4 the leakage inductance energy that when switching tube Q8 disconnects, transformer T2 produces; When switching to another working method, the switching tube of microprocessor controls second leakage inductance energy absorption feedback circuit, by the energy feedback of storage capacitor C4 in input DC power;
2, microcontroller sends pwm signal, opens switching tube Q8 by switch tube driving circuit, cut-off switch pipe Q4, and then control the second DC-DC conversion circuit externally load energy is provided, cut-off switch pipe Q7, opens switching tube Q6, by the energy feedback of storage capacitor C4 in input DC power; Open switching tube Q3, cut-off switch pipe Q2 in first leakage inductance energy absorption feedback circuit simultaneously, absorb by storage capacitor C2 the leakage inductance energy that when switching tube Q4 disconnects, transformer T1 produces; When switching to another working method, the switching tube of microprocessor controls first leakage inductance energy absorption feedback circuit, by the energy feedback of storage capacitor C2 in input DC power.
Claims (7)
1.DC-DC converter leakage inductance energy feedback numerical control device, comprise input DC power, the first DC-DC conversion circuit, the second DC-DC conversion circuit, described first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel, composition crisscross parallel DC-DC converter, the output of described input DC power is connected with the input of crisscross parallel DC-DC converter, the described output of crisscross parallel DC-DC converter is connected with the input of external loading, it is characterized in that:
Also comprise microcontroller, output voltage current detection circuit, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit;
The input of described output voltage current detection circuit is connected with the output of crisscross parallel DC-DC converter; The described output of output voltage current detection circuit is connected with the input of microcontroller; The output of described microcontroller is connected with the control end of crisscross parallel DC-DC converter, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit respectively; The input of described first leakage inductance energy absorption feedback circuit is connected with the output of the first DC-DC conversion circuit, and the described output of the first leakage inductance energy absorption feedback circuit is connected with the input of input DC power; The input of described second leakage inductance energy absorption feedback circuit is connected with the output of the second DC-DC conversion circuit, and the described output of the second leakage inductance energy absorption feedback circuit is connected with the input of input DC power.
2. DC-DC converter leakage inductance energy feedback numerical control device according to claim 1, is characterized in that:
Further comprise front stage circuits; The input of described front stage circuits is connected with the output of input DC power, and the output of described front stage circuits is connected with the input of crisscross parallel DC-DC converter.
3. DC-DC converter leakage inductance energy feedback numerical control device according to claim 1, is characterized in that:
Further comprise output filter circuit; The input of described output filter circuit is connected with the output of crisscross parallel DC-DC converter, the output of described output filter circuit is connected with external loading, and the output of described output filter circuit is connected with the input of microcontroller through output voltage current detection circuit.
4. DC-DC converter leakage inductance energy feedback numerical control device according to claim 1, is characterized in that:
Further comprise switch tube driving circuit; The input of described switch tube driving circuit is connected with the output of microcontroller, and the output of described switch tube driving circuit is connected with the control end of crisscross parallel DC-DC converter, the first leakage inductance energy absorption feedback circuit and the second leakage inductance energy absorption feedback circuit respectively.
5. DC-DC converter leakage inductance energy feedback numerical control device according to claim 4, is characterized in that:
Further comprise accessory power supply; The output of described accessory power supply is connected with the feeder ear of microcontroller, output voltage current detection circuit and switch tube driving circuit.
6., according to the DC-DC converter leakage inductance energy feedback numerical control device in claim 1-5 described in any one, it is characterized in that:
Described first leakage inductance energy absorption feedback circuit is identical with the circuit structure of the second leakage inductance energy absorption feedback circuit;
Described first leakage inductance energy absorption feedback circuit is made up of switching tube Q1, switching tube Q2, switching tube Q3, electric capacity C1, electric capacity C2, diode D1 and inductance L 1;
The drain electrode of described switching tube Q3 is connected with the first DC-DC conversion circuit, and the source electrode of described switching tube Q3 is connected with the drain electrode of switching tube Q2, and the source electrode of described switching tube Q3 is connected with the source electrode of switching tube Q1 through electric capacity C2; The source electrode of described switching tube Q2 is connected through the drain electrode of inductance L 1 with switching tube Q1; The source ground of described switching tube Q1, after the drain electrode of described switching tube Q1 is connected with diode D1, is connected with the source electrode of switching tube Q1 through electric capacity C1; The described negative pole of diode D1 is connected with the positive pole of input DC power; The grid of described switching tube Q1, switching tube Q2, switching tube Q3 is connected with microcontroller.
7. DC-DC converter leakage inductance energy feedback numerical control device according to claim 6, is characterized in that:
Described first DC-DC conversion circuit is identical with the circuit structure of the second DC-DC conversion circuit;
Described first DC-DC conversion circuit is made up of switching tube Q4, transformer T1 and diode D3;
The Same Name of Ends of described transformer T1 armature winding N1 is connected with the output of input DC power, the different name end of described transformer T1 armature winding N1 is connected with the drain electrode of the switching tube Q3 of the first leakage inductance energy absorption feedback circuit, the different name end of described transformer T1 armature winding N1 is connected with the drain electrode of switching tube Q4, and the Same Name of Ends of described transformer T1 secondary winding N2 is connected with a road input of external loading through diode D3; The described source electrode of switching tube Q4 is connected with the negative pole of input DC power, and the grid of described switching tube Q4 is connected with microcontroller; The transformer T1 of described first DC-DC conversion circuit is connected with the Same Name of Ends of primary winding in the second DC-DC conversion circuit; In described first DC-DC conversion circuit, the different name end of transformer T1 secondary winding is connected with the different name end of transformer secondary output winding in the second DC-DC conversion circuit, and described two different name ends are all connected with another road input of external loading; Described first DC-DC conversion circuit is connected with the negative electrode of two diodes of the second DC-DC conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511020395.2A CN105450032A (en) | 2015-12-30 | 2015-12-30 | Leakage inductance energy feedback digital control device for DC-DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511020395.2A CN105450032A (en) | 2015-12-30 | 2015-12-30 | Leakage inductance energy feedback digital control device for DC-DC converter |
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| CN105450032A true CN105450032A (en) | 2016-03-30 |
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| CN201511020395.2A Pending CN105450032A (en) | 2015-12-30 | 2015-12-30 | Leakage inductance energy feedback digital control device for DC-DC converter |
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| CN109951098A (en) * | 2018-10-18 | 2019-06-28 | 广西师范大学 | One kind quickly isolating breaker and its control algolithm |
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| CN110190771A (en) * | 2019-06-21 | 2019-08-30 | 北京机械设备研究所 | A kind of high-frequency impulse circuit and peak voltage clamp absorption process |
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Application publication date: 20160330 |