CN108683354B - Pulse frequency modulation converter circuit - Google Patents
Pulse frequency modulation converter circuit Download PDFInfo
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- CN108683354B CN108683354B CN201810520860.6A CN201810520860A CN108683354B CN 108683354 B CN108683354 B CN 108683354B CN 201810520860 A CN201810520860 A CN 201810520860A CN 108683354 B CN108683354 B CN 108683354B
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- 230000005669 field effect Effects 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000004146 energy storage Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000009499 grossing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
-
- 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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- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a pulse frequency modulation converter circuit, wherein the positive electrode of a power supply E is connected with the drain electrodes of field effect transistors K1 and K3; the source electrode of the K1 is connected with the anode of the diode VD 1; the upper end of the capacitor C1 is connected with the cathode of the VD1 and the anode of the diode VD 2; the cathode of the diode VD3 is connected with the anode of the diode VD4 and the lower end of the C1; the drain electrode of the field effect tube K2 is connected with the cathode of the VD 2; the cathode of the VD4 is connected with the drain electrode of the field effect transistor K4; the source electrode of K3 is connected with the anode of VD 3; the sources of K2 and K4 are connected with the cathode of the diode VD and the left end of the inductor L; the right end of the L is connected with the upper end of the primary side of the transformer T; the lower end of the primary side of the T is connected with a VD anode and an E cathode; the grid electrodes of K1-K4 are connected with driving signals; the output of the T secondary side is connected with the alternating current side of the rectifier bridge; the positive polarity output end of the rectifier bridge is connected with the upper ends of the capacitors C2-C3 and the collector electrodes of the triodes V1 and V3; the V1 emitter is connected with the collector of the triode V2, the upper end of the capacitor C4 and the upper end of the load RL; the V3 emitter is connected with the lower end of C4, the collector of triode V4 and the lower end of RL; the emitters of V4 and V2 are connected with the lower ends of C2-C3 and the negative polarity output end of the rectifier bridge; the bases of V1-V4 are connected with control signals.
Description
Technical Field
The invention relates to a pulse frequency modulation converter circuit and a method, in particular to a pulse frequency modulation converter circuit and a method, wherein the output waveform is a standard sine wave; a circuit and method with adjustable output power, adjustable sine wave frequency and low waveform distortion in a certain range of required frequency band and load impedance.
Background
In the prior art, the traditional PWM technology works in a voltage chopping mode, and for high-power output waveforms, the high-power output waveforms are difficult to filter out higher harmonic waves in a passive filtering mode, the voltage chopping mode has low circuit efficiency and poor control performance, and a power switch tube is lack of protection, so that the technology which has good control performance, works in a soft switch state and has adjustable output power is developed, and the technology becomes the problem which needs to be solved.
Disclosure of Invention
The invention aims to solve the problems, and provides a pulse frequency modulation converter circuit and a corresponding method, which enable a main switching device of the circuit to work in a soft switching state, a digital signal is directly controlled, a main power device is not damaged, the circuit efficiency is high, and the waveform fidelity is high, so that the problems in the prior art are solved.
The pulse frequency modulation converter circuit provided by the invention consists of a resistor, a capacitor, a diode, a triode, a field effect tube and a transformer, and is characterized in that the anode of a power supply E, the drain electrode of the field effect tube K1 and the drain electrode of the field effect tube K3 are connected; the source electrode of the field effect tube K1 is connected with the anode of the diode VD 1; the upper end of the energy storage capacitor C1, the cathode of the diode VD1 and the anode of the diode VD2 are connected; the cathode of the diode VD3 and the anode of the diode VD4 are connected with the lower end of the energy storage capacitor C1; the drain electrode of the field effect tube K2 is connected with the cathode of the diode VD 2; the cathode of the diode VD4 is connected with the drain electrode of the field effect transistor K4; the source electrode of the field effect tube K3 is connected with the anode of the diode VD 3; the source electrode of the field effect tube K2, the source electrode of the field effect tube K4, the cathode of the diode VD and the left end of the smoothing inductor L are connected; the right end of the flat wave inductor L is connected with the upper end of the primary side of the transformer T; the lower end of the primary side of the transformer T, the anode of the diode VD and the cathode of the power supply E are connected and then grounded; the grid electrodes of the field effect transistors K1-K4 are connected with corresponding driving signals G1-G4; the secondary side output of the transformer is connected with the alternating current side of the rectifier bridge; the positive polarity output end of the rectifier bridge, the upper end of the filter capacitor C2, the upper end of the filter capacitor C3, the collector of the triode V1 and the collector of the triode V3 are connected; the emitter of the triode V1, the collector of the triode V2 and the upper end of the filter capacitor C4 are connected with the upper end of the load RL; the emitter of the triode V3, the lower end of the filter capacitor C4, and the collector of the triode V4 are connected with the lower end of the load RL; the emitter of the triode V4, the emitter of the triode V2, the lower end of the filter capacitor C3 and the negative polarity output end of the rectifier bridge are connected with the ground; the bases of the triodes V1-V4 are connected with corresponding control signals G5-G8.
In the circuit, the field effect transistors K1-K4 are main loop power switching transistors and are high-speed field effect transistors, and the triodes V1-V4 are triodes with higher characteristic frequencies.
The transistors V1-V4 constitute an inverter circuit.
A pulse frequency modulation conversion method is characterized in that a high-power high-speed field effect transistor is adopted to construct a system main loop, a DSP is adopted to control, a control circuit is constructed, a digital signal direct-control power main switching device and an inversion (phase inversion) circuit are adopted, and the adopted circuit structure is as follows:
the positive electrode of the power supply E, the drain electrode of the field effect tube K1 and the drain electrode of the field effect tube K3 are connected; the source electrode of the field effect tube K1 is connected with the anode of the diode VD 1; the upper end of the energy storage capacitor C1, the cathode of the diode VD1 and the anode of the diode VD2 are connected; the cathode of the diode VD3 and the anode of the diode VD4 are connected with the lower end of the energy storage capacitor C1; the drain electrode of the field effect tube K2 is connected with the cathode of the diode VD 2; the cathode of the diode VD4 is connected with the drain electrode of the field effect transistor K4; the source electrode of the field effect tube K3 is connected with the anode of the diode VD 3; the source electrode of the field effect tube K2, the source electrode of the field effect tube K4, the cathode of the diode VD and the left end of the smoothing inductor L are connected; the right end of the flat wave inductor L is connected with the upper end of the primary side of the transformer T; the lower end of the primary side of the transformer T, the anode of the diode VD and the cathode of the power supply E are connected and then grounded; the grid electrodes of the field effect transistors K1-K4 are connected with corresponding driving signals G1-G4; the secondary side output of the transformer is connected with the alternating current side of the rectifier bridge; the positive polarity output end of the rectifier bridge, the upper end of the filter capacitor C2, the upper end of the filter capacitor C3, the collector of the triode V1 and the collector of the triode V3 are connected; the emitter of the triode V1, the collector of the triode V2 and the upper end of the filter capacitor C4 are connected with the upper end of the load RL; the emitter of the triode V3, the lower end of the filter capacitor C4, and the collector of the triode V4 are connected with the lower end of the load RL; the emitter of the triode V4, the emitter of the triode V2, the lower end of the filter capacitor C3 and the negative polarity output end of the rectifier bridge are connected with the ground; the bases of the triodes V1-V4 are connected with corresponding control signals G5-G8.
The working process of the invention can be described as:
the method comprises the steps of obtaining load power with a fixed value by controlling the turn-on and turn-off times of a power switching tube of a main loop, outputting different power values at an output end, changing the capacitance values of a power supply voltage E and an energy storage capacitor C1, and adjusting the power obtained by the load by any one value of chopping frequency values of a chopper bridge of the main loop; the method comprises the steps of fixing an energy storage capacitance value C1 and a power supply voltage E in the power switch, changing a chopping frequency value, obtaining corresponding output power of different values related to frequency change of a driving signal, controlling the number of pulses in the pulse period through a control program, turning off and on a power switch tube in a main loop once by each pulse, obtaining a fixed-value power by each on-off, storing energy in the main loop when the power switch tube is turned on, releasing energy when the power switch tube is turned off, obtaining corresponding load energy, changing the on-off frequency of the switch tube by different numbers of pulses in the pulse period, thereby obtaining required power by the load, generating PWM pulse driving signals by a DSP, turning on or off the power switch tube, enabling the chopping frequency to show a sine rule, alternately turning on an inverter bridge after energy storage superposition of the sine rule, and transmitting the energy to the load, and synthesizing sine waves by the load.
Compared with the traditional PWM converter circuit, the circuit has the advantages that all main switching devices work in a soft switching state, digital signals can be completely adopted for direct control, and the like, the output short circuit of the power circuit does not damage the main switching devices, and the circuit has high efficiency. The output waveform is a standard sine wave; the output power is adjustable in the required frequency band and load impedance range, and the waveform distortion degree is low.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The implementation and beneficial effects of the invention are further described below with reference to the accompanying drawings.
The calculation of parameters such as the specification of a field effect tube, a triode, a diode, the size of a capacitor, the size of a resistor and the like in the circuit are completely the same as those in the prior art, and belong to the mature technology, so that the specification is not discussed.
As shown in fig. 1, field effect transistors K1, K2, K3, K4 are main loop power switching transistors, capacitor C1 is a main loop energy storage capacitor, inductance L is a flat wave inductance, capacitors C2, C3, C4 are filter capacitors, and triodes V1, V2, V3, V4 form an inversion (phase inversion) circuit. The specific implementation mode is as follows:
the positive electrode of the power supply E, the drain electrode of the field effect transistor K1 and the drain electrode of the field effect transistor K3 are connected. The anode of the source diode VD1 of the field effect transistor K1 is connected. The upper end of the energy storage capacitor C1, the cathode of the diode VD1 and the anode of the diode VD2 are connected. The cathode of the diode VD3, the anode of the diode VD4 and the lower end of the energy storage capacitor C1 are connected. The drain electrode of the field effect transistor K2 is connected with the cathode of the diode VD 2. The cathode of the diode VD4 and the drain of the field effect transistor K4 are connected. The anode of the source diode VD3 of the field effect transistor K3 is connected. The source electrode of the field effect tube K2, the source electrode of the field effect tube K4, the cathode of the diode VD and the left end of the flat wave inductor L are connected. The right end of the flat wave inductor L is connected with the upper end of the primary side of the transformer T. The lower end of the primary side of the transformer T, the anode of the diode VD and the cathode of the power supply E are connected and then grounded. The gates of the field effect transistors K1, K2, K3, K4 are connected to the corresponding driving signals G1, G2, G3, G4. The secondary side output of the transformer is connected with the alternating current side of the rectifier bridge, and the positive polarity output end of the rectifier bridge, the upper end of the filter capacitor C2, the upper end of the filter capacitor C3, the collector of the triode V1 and the collector of the triode V3 are connected. The emitter of the triode V1, the collector of the triode V2, the upper end of the filter capacitor C4 and the upper end of the load RL are connected. The emitter of the triode V3, the lower end of the filter capacitor C4, the collector of the triode V4 and the lower end of the load RL are connected. The emitter of the triode V4, the emitter of the triode V2, the lower end of the filter capacitor C3 and the negative polarity output end of the rectifier bridge are connected with the ground. The bases of the transistors V1, V2, V3, V4 are connected to respective control signals G5, G6, G7, G8.
The actual measurement shows that: according to the invention, a high-power sliding rheostat with a rated current of 2A and an adjustable resistance value (0-100 ohms) is used as a load, the load obtains a standard sine wave, the on-off frequency of a switching tube is changed by adjusting the difference of the pulse numbers in a pulse period (driving frequency), namely the chopping frequency is changed, so that the power obtained by the load is adjustable within a certain range, and the sine wave frequency is adjustable within a certain range.
Claims (1)
1. A pulse frequency modulation conversion method is characterized in that a high-power high-speed field effect transistor is adopted to construct a system main loop, a DSP is adopted to control, a control circuit, a digital signal direct-control power main switching device and an inversion phase-inversion circuit are constructed, and the circuit structure is as follows: the positive electrode of the power supply E, the drain electrode of the field effect tube K1 and the drain electrode of the field effect tube K3 are connected; the source electrode of the field effect tube K1 is connected with the anode of the diode VD 1; the upper end of the energy storage capacitor C1, the cathode of the diode VD1 and the anode of the diode VD2 are connected; the cathode of the diode VD3 and the anode of the diode VD4 are connected with the lower end of the energy storage capacitor C1; the drain electrode of the field effect tube K2 is connected with the cathode of the diode VD 2; the cathode of the diode VD4 is connected with the drain electrode of the field effect transistor K4; the source electrode of the field effect tube K3 is connected with the anode of the diode VD 3; the source electrode of the field effect tube K2, the source electrode of the field effect tube K4, the cathode of the diode VD and the left end of the smoothing inductor L are connected; the right end of the flat wave inductor L is connected with the upper end of the primary side of the transformer T; the lower end of the primary side of the transformer T, the anode of the diode VD and the cathode of the power supply E are connected and then grounded; the grid electrodes of the field effect transistors K1-K4 are connected with corresponding driving signals G1-G4; the secondary side output of the transformer is connected with the alternating current side of the rectifier bridge; the positive polarity output end of the rectifier bridge, the upper end of the filter capacitor C2, the upper end of the filter capacitor C3, the collector of the triode V1 and the collector of the triode V3 are connected; the emitter of the triode V1, the collector of the triode V2 and the upper end of the filter capacitor C4 are connected with the upper end of the load RL; the emitter of the triode V3, the lower end of the filter capacitor C4, and the collector of the triode V4 are connected with the lower end of the load RL; the emitter of the triode V4, the emitter of the triode V2, the lower end of the filter capacitor C3 and the negative polarity output end of the rectifier bridge are connected with the ground; the bases of the triodes V1-V4 are connected with corresponding control signals G5-G8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810520860.6A CN108683354B (en) | 2018-05-28 | 2018-05-28 | Pulse frequency modulation converter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810520860.6A CN108683354B (en) | 2018-05-28 | 2018-05-28 | Pulse frequency modulation converter circuit |
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| CN108683354A CN108683354A (en) | 2018-10-19 |
| CN108683354B true CN108683354B (en) | 2024-02-02 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461100A (en) * | 2003-06-11 | 2003-12-10 | 何岳明 | Low-voltage D.C. power supply circuit |
| WO2005057766A1 (en) * | 2003-12-08 | 2005-06-23 | Fuyong Lin | A dc power supply with.high power factor |
| CN101030732A (en) * | 2007-01-09 | 2007-09-05 | 南京航空航天大学 | Positive exciting magnetic integrated converter of outputting-current corrugated minimum |
| CN101588126A (en) * | 2009-06-24 | 2009-11-25 | 哈尔滨工业大学 | The ZVZCS three-level DC-DC converter of wide load characteristic |
| WO2016041122A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Quick start circuit of led drive power supply |
| CN106505870A (en) * | 2016-11-25 | 2017-03-15 | 广东百事泰电子商务股份有限公司 | A kind of long-life intelligently voltage boosting conversion equipment |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
| CN206332657U (en) * | 2016-12-23 | 2017-07-14 | 红河学院 | A kind of ultrahigh speed FET drive circuit |
| CN208158439U (en) * | 2018-05-28 | 2018-11-27 | 红河学院 | A kind of pulse frequency modulated convertor circuit |
-
2018
- 2018-05-28 CN CN201810520860.6A patent/CN108683354B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461100A (en) * | 2003-06-11 | 2003-12-10 | 何岳明 | Low-voltage D.C. power supply circuit |
| WO2005057766A1 (en) * | 2003-12-08 | 2005-06-23 | Fuyong Lin | A dc power supply with.high power factor |
| CN101030732A (en) * | 2007-01-09 | 2007-09-05 | 南京航空航天大学 | Positive exciting magnetic integrated converter of outputting-current corrugated minimum |
| CN101588126A (en) * | 2009-06-24 | 2009-11-25 | 哈尔滨工业大学 | The ZVZCS three-level DC-DC converter of wide load characteristic |
| WO2016041122A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Quick start circuit of led drive power supply |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
| CN106505870A (en) * | 2016-11-25 | 2017-03-15 | 广东百事泰电子商务股份有限公司 | A kind of long-life intelligently voltage boosting conversion equipment |
| CN206332657U (en) * | 2016-12-23 | 2017-07-14 | 红河学院 | A kind of ultrahigh speed FET drive circuit |
| CN208158439U (en) * | 2018-05-28 | 2018-11-27 | 红河学院 | A kind of pulse frequency modulated convertor circuit |
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