CN112234857A - Switch type driving power amplifier with large capacitive load - Google Patents
Switch type driving power amplifier with large capacitive load Download PDFInfo
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- CN112234857A CN112234857A CN202011229712.2A CN202011229712A CN112234857A CN 112234857 A CN112234857 A CN 112234857A CN 202011229712 A CN202011229712 A CN 202011229712A CN 112234857 A CN112234857 A CN 112234857A
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- bridge inverter
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 239000000969 carrier Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a switch type driving power amplifier with a large capacitive load, which comprises a digital/analog conversion control circuit, a PWM (pulse width modulation) rectifying circuit, a plurality of paths of half-bridge inverter circuits, a power circuit, a large capacitive load and a plurality of paths of half-bridge inverter circuits; and the multi-path half-bridge inverter circuit is connected with a large capacitive load. The invention adopts a multi-path half-bridge inverter circuit parallel topology structure, controls a core amplifier tube by utilizing a phase-shifting SPWM driving mode, and generates high voltage, high frequency and large current to be output to a large capacitive load.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a switch type driving power amplifier with a large capacitive load.
Background
In the prior art, capacitive load driving power amplification is mostly realized by adopting a direct current amplification method and a switch method. When the large capacitive load works in kilohertz level, the alternating current impedance of the capacitive load is reduced along with the increase of the working frequency, and the current far exceeds the low frequency or direct current working state when the power amplifier is driven to output in high voltage and high frequency. In the electricity, the capacitive load and the output impedance R of the driving circuit form an RC loop, which affects the dynamic performance of the driving power amplifier, so that the requirement for the performance of the capacitive load driving power amplifier is high. With the development of power electronics, a direct current amplification type driving power amplifier with an operational amplifier and an analog power device as cores has the advantages of simple principle and easy driving mode, but when the direct current amplification type driving power amplifier is applied to high-voltage, high-frequency and high-power output occasions, the direct current amplification type driving power amplifier has the defects of large circuit power loss, low conversion efficiency and the like, and particularly under the condition of large capacitive load, the direct current amplification type driving power amplifier has the problem of difficulty in outputting large current under high frequency and high voltage.
For a large capacitive load, the problem of instantaneous large-current charging exists, the driving is disturbed if the charging is light, the reliability is influenced, and a device is damaged if the charging is heavy. In the MOS transistor model selection scheme, although the first-generation Si bipolar transistor is widely applied to low-frequency phase control, the working frequency is limited, so that the first-generation Si bipolar transistor is not suitable for the use occasion of large capacitive load; second generation MOSFETs have improved, but at the expense of high voltage operation capability, power MOSFETs deteriorate at a faster rate with increasing breakdown voltage.
Disclosure of Invention
The present invention aims to solve the above problems and provide a switch-type driving power amplifier with large capacitive load, which comprises a digital/analog conversion control circuit, a PWM rectifier circuit, a multi-path half-bridge inverter circuit, a power circuit, a large capacitive load, and a multi-path half-bridge inverter circuit; the first output end of the digital/analog conversion control circuit is connected with the input end of the PWM rectification circuit; the power supply circuit is respectively connected with the PWM rectifying circuit and the multi-path half-bridge inverter circuit; the output end of the PWM rectification circuit and the output end of the digital/analog conversion control circuit are respectively connected with the input end of the multi-path half-bridge inverter circuit; the digital/analog conversion control circuit is used for a signal source input end and outputting SPWM signals, and the SPWM signals are used for driving the multi-path half-bridge inverter circuit; and the multi-path half-bridge inverter circuit is connected with a large capacitive load.
The invention realizes the purpose through the following technical scheme: the rectification circuit realizes the rectification of unit power factor of AC-DC, outputs 0 to kilovolt stable direct current voltage to the multi-path half-bridge inverter circuit, the digital/analog conversion control circuit generates SPWM signals to drive MOSFET tubes in the multi-path half-bridge inverter circuit, and the direct current voltage output by the rectification circuit is inverted into sine wave voltage signals with amplitude and frequency determined by the SPWM signals and finally acts on a large capacitive load.
The invention has the beneficial effects that: the invention adopts a multi-path half-bridge inverter circuit parallel topology structure, controls a core amplifier tube by utilizing a phase-shifting SPWM driving mode, and generates high voltage, high frequency and large current to be output to a large capacitive load.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a circuit diagram of a multi-way half-bridge inverter circuit;
FIG. 3 is a schematic diagram of an SPWM modulation waveform;
FIG. 4 is a graph of the output voltage waveform of a multi-path half-bridge inverter circuit;
fig. 5 is a diagram of large capacitive load drive voltage waveforms.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in the attached figure 1, the switch-type driving power amplifier with large capacitive load of the invention comprises a digital/analog conversion control circuit, a PWM (pulse-width modulation) rectification circuit, a multi-path half-bridge inverter circuit, a power circuit, a large capacitive load and a multi-path half-bridge inverter circuit; the first output end of the digital/analog conversion control circuit is connected with the input end of the PWM rectification circuit; the power supply circuit is respectively connected with the PWM rectifying circuit and the multi-path half-bridge inverter circuit; the output end of the PWM rectification circuit and the output end of the digital/analog conversion control circuit are respectively connected with the input end of the multi-path half-bridge inverter circuit; the digital/analog conversion control circuit is used for a signal source input end and outputting SPWM signals, and the SPWM signals are used for driving the multi-path half-bridge inverter circuit; and the multi-path half-bridge inverter circuit is connected with a large capacitive load.
Specifically, as shown in fig. 2, the multi-path half-bridge inverter circuit includes at least two parallel half-bridge circuits; the half-bridge circuit comprises a first switching tube unit and a second switching tube unit; the first switch tube unit comprises a first switch tube; the second switch tube unit comprises a second switch tube; the control output end of the digital/analog conversion control circuit is connected with the grid electrode of the first switching tube and the grid electrode of the second switching tube; the first output end of the power supply circuit is connected with the source electrode of the first switching tube; the drain electrode of the first switch tube is connected with the source electrode of the second switch tube; the drain electrode of the second switching tube is connected with the second output end of the power circuit.
Specifically, the first switching tube unit and the second switching tube unit both comprise a first capacitor, a diode and a resistor; the first end of the capacitor is connected with the source electrode of the switching tube; the second end of the capacitor is connected with the anode of the diode and the first end of the resistor; the cathode of the diode and the second end of the resistor are connected with the drain of the switch tube.
Specifically, the digital/analog conversion control circuit comprises a sensor, an analog-to-digital conversion unit, a DSP controller and an isolation drive circuit; the sensor is connected with a first input end of the DSP controller through an analog-to-digital conversion unit; the second input end of the DSP controller is used for signal source input; the output end of the DSP controller is connected with the input end of the multi-path half-bridge inverter circuit through an isolation driving circuit.
The power supply circuit adopts a linear voltage stabilizer and is used for outputting direct-current voltage. The PWM rectifying circuit adopts a rectifier. The input end of the multi-path half-bridge inverter circuit is provided with a limiting circuit, overvoltage protection is carried out on the multi-path half-bridge inverter circuit, the switch tube is prevented from being damaged, and the DSP controller is connected with the input end of the limiting circuit through a PWM (pulse width modulation) rectifier circuit; the amplitude limiting circuit is connected with the multi-path half-bridge inverter circuit in parallel.
The output end of the multi-path half-bridge inverter circuit is connected with the capacitive load through the filter circuit, and the capacitive load is driven. The voltage/current sensor detects the voltage and current at the output end of the filter circuit, and the voltage and current are output to the DSP controller through the analog-to-digital conversion unit, so that the overvoltage and overcurrent monitoring of the circuit is realized.
The invention is based on a cascade topology structure of a multi-path half-bridge inverter circuit, the half-bridge inverter circuit is set as N paths, 2N triangular waves with completely same amplitude and frequency are required to be used as carriers, and the phase shift of any 2 adjacent carriers is
The same modulated wave is compared with 2N triangular carriers with uniformly shifted phases respectively, and the waveform generation mode and the waveform superposition generate a phase-shifting SPWM waveform (as shown in figure 3, f is set)0Carrier signal frequency), can make the ripple that mixes in the output circuit originally play the counteraction after mutual superpose, the effectual output harmonic that reduces improves and drives the power amplifier bandwidth, realizes high frequency output.
The rectification circuit realizes the rectification of unit power factor of AC-DC, outputs 0 to kilovolt level stable direct current voltage to the multi-path half-bridge inverter circuit, the digital/analog conversion control circuit generates SPWM signals to drive MOSFET tubes in the multi-path half-bridge inverter circuit, and inverts the direct current voltage output by the rectification circuit into sine wave voltage signals with amplitude frequency determined by the SPWM signals (as shown in figure 4, the output voltage waveform diagram of the multi-path half-bridge inverter circuit, the horizontal axis is time, the first current curve, the second voltage curve and the voltage waveform diagram of the large capacitive load driving voltage after filtering processing shown in figure 5) and finally acts on the large capacitive load.
The invention adopts SiC semiconductor material with excellent performance, the SiC MOS tube has large forbidden band width, high intrinsic temperature, high breakdown voltage and small on-resistance, thereby having small switching loss and good adaptability to temperature, and being capable of realizing large current output.
The invention provides a driving power amplifier based on a switch type topological structure, which adopts a multi-path half-bridge inverter circuit parallel topological structure and utilizes a phase-shifting SPWM driving mode to control a core amplifying tube to generate high voltage, high frequency and large current to be output to a large capacitive load. In the application of the test system, the PI company P-056.90P type piezoelectric ceramic is selected for testing, the equivalent electrostatic capacitance is 5 muF, when the amplitude of an input small signal is 0-10V, the output voltage reaches 1000V, the output power is 4kW, the driving power amplifier frequency response is 5 Hz-2000 Hz, the output current is not less than 4A, and the voltage gain is not less than 100.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (5)
1. A switch-type drive power amplifier with large capacitive load comprises a digital/analog conversion control circuit, a PWM (pulse-width modulation) rectification circuit, a plurality of paths of half-bridge inverter circuits, a power circuit and the large capacitive load, and is characterized by also comprising the plurality of paths of half-bridge inverter circuits; the first output end of the digital/analog conversion control circuit is connected with the input end of the PWM rectification circuit; the power supply circuit is respectively connected with the PWM rectifying circuit and the multi-path half-bridge inverter circuit; the output end of the PWM rectification circuit and the output end of the digital/analog conversion control circuit are respectively connected with the input end of the multi-path half-bridge inverter circuit; the digital/analog conversion control circuit is used for a signal source input end and outputting SPWM signals, and the SPWM signals are used for driving the multi-path half-bridge inverter circuit; and the multi-path half-bridge inverter circuit is connected with a large capacitive load.
2. The large capacitive load switch-type driver amplifier as claimed in claim 1, wherein said multi-way half-bridge inverter circuit comprises at least two parallel half-bridge circuits; the half-bridge circuit comprises a first switching tube unit and a second switching tube unit; the first switch tube unit comprises a first switch tube; the second switch tube unit comprises a second switch tube; the control output end of the digital/analog conversion control circuit is connected with the grid electrode of the first switching tube and the grid electrode of the second switching tube; the first output end of the power supply circuit is connected with the source electrode of the first switching tube; the drain electrode of the first switch tube is connected with the source electrode of the second switch tube; the drain electrode of the second switching tube is connected with the second output end of the power circuit.
3. The large capacitive load switch-mode driver power amplifier of claim 2, wherein the first switching transistor unit and the second switching transistor unit each comprise a first capacitor, a diode, and a resistor; the first end of the first capacitor is connected with the source electrode of the switching tube; the second end of the first capacitor is connected with the anode of the diode and the first end of the resistor; the cathode of the diode and the second end of the resistor are connected with the drain of the switch tube.
4. The large capacitive load switch-mode driver power amplifier of claim 2, wherein the first switch transistor and the second switch transistor are both SiC MOS transistors.
5. The large capacitive load switch-type driver power amplifier of claim 1, wherein the digital/analog conversion control circuit comprises a sensor, an analog-to-digital conversion unit, a DSP controller and an isolation driving circuit; the sensor is connected with a first input end of the DSP controller through an analog-to-digital conversion unit; the second input end of the DSP controller is used for signal source input; the output end of the DSP controller is connected with the input end of the multi-path half-bridge inverter circuit through an isolation driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229712.2A CN112234857A (en) | 2020-11-06 | 2020-11-06 | Switch type driving power amplifier with large capacitive load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229712.2A CN112234857A (en) | 2020-11-06 | 2020-11-06 | Switch type driving power amplifier with large capacitive load |
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| CN112234857A true CN112234857A (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011229712.2A Pending CN112234857A (en) | 2020-11-06 | 2020-11-06 | Switch type driving power amplifier with large capacitive load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317664A (en) * | 2023-03-10 | 2023-06-23 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206041819U (en) * | 2016-08-19 | 2017-03-22 | 武汉水院电气有限责任公司 | A series resonance type high frequency and high voltage invertion power supply for ozone generating device |
| CN107612406A (en) * | 2017-09-06 | 2018-01-19 | 深圳市艾尔曼医疗电子仪器有限公司 | The non-constant frequency intermediate frequency power supply of capacitive variable load inversion high pressure and its mu balanced circuit |
| CN110401375A (en) * | 2019-07-29 | 2019-11-01 | 西南科技大学 | A kind of high-voltage piezoelectric ceramic driving power supply and control method |
| CN213937765U (en) * | 2020-11-06 | 2021-08-10 | 中国工程物理研究院总体工程研究所 | Switch type driving power amplifier with large capacitive load |
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2020
- 2020-11-06 CN CN202011229712.2A patent/CN112234857A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206041819U (en) * | 2016-08-19 | 2017-03-22 | 武汉水院电气有限责任公司 | A series resonance type high frequency and high voltage invertion power supply for ozone generating device |
| CN107612406A (en) * | 2017-09-06 | 2018-01-19 | 深圳市艾尔曼医疗电子仪器有限公司 | The non-constant frequency intermediate frequency power supply of capacitive variable load inversion high pressure and its mu balanced circuit |
| CN110401375A (en) * | 2019-07-29 | 2019-11-01 | 西南科技大学 | A kind of high-voltage piezoelectric ceramic driving power supply and control method |
| CN213937765U (en) * | 2020-11-06 | 2021-08-10 | 中国工程物理研究院总体工程研究所 | Switch type driving power amplifier with large capacitive load |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317664A (en) * | 2023-03-10 | 2023-06-23 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
| CN116317664B (en) * | 2023-03-10 | 2023-10-13 | 南京航空航天大学 | Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output |
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