CN107612406B - Capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and voltage stabilizing circuit thereof - Google Patents
Capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and voltage stabilizing circuit thereof Download PDFInfo
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- CN107612406B CN107612406B CN201710797194.6A CN201710797194A CN107612406B CN 107612406 B CN107612406 B CN 107612406B CN 201710797194 A CN201710797194 A CN 201710797194A CN 107612406 B CN107612406 B CN 107612406B
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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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Abstract
The invention provides a capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and a voltage stabilizing circuit thereof. The voltage stabilizing circuit is arranged between an alternating voltage output end of the medium-frequency power supply and the power amplifier and comprises a sampling circuit, a summing circuit and a voltage-controlled oscillator. The sampling circuit is used for sampling the intermediate frequency output voltage output by the alternating voltage output end and feeding back the obtained sampling voltage to the summing circuit. The summing circuit sums the sampling voltage and a DC reference voltage to obtain a summed output voltage, and outputs the summed output voltage to the input terminal of the voltage-controlled oscillator, so that the oscillation frequency of the voltage-controlled oscillator tracks the intermediate frequency output voltage and outputs an intermediate frequency driving signal to the driving input terminal of the power amplifier, and the resonant circuit of the output unit of the power amplifier outputs the intermediate frequency output voltage to the AC voltage output terminal to maintain the resonance of the resonant circuit. The invention can realize the voltage stabilization of the capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply.
Description
Technical Field
The invention relates to a capacitive load inversion high-voltage intermediate-frequency power supply, in particular to a capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and a voltage stabilizing circuit thereof.
Background
A capacitive load inversion high-voltage medium-frequency power supply is an inversion medium-frequency power supply and is mainly applied to medium-frequency high-voltage electric field generating equipment.
When the medium-frequency high-voltage electric field generating equipment works, the load is connected with the two electrodes, and a high-voltage medium-frequency electric field is generated between the two electrodes. When the distance between two electrodes changes, the capacitance between the electrodes changes. However, some of the medium-frequency high-voltage electric field generating apparatuses require the electric field strength to be maintained constant, and some of the medium-frequency high-voltage electric field generating apparatuses require the output voltage to be stable and constant. The medium-frequency high-voltage electric field generating equipment which requires stable and unchangeable output voltage generally allows the frequency to fluctuate within a certain frequency range unless the medium-frequency electric field with constant frequency and stable voltage is required to be generated.
For medium-frequency high-voltage electric field generating equipment which requires stable and unchanged output voltage at the same time of non-constant frequency, when the electrode distance is changed, because the capacitive load is changed, the output voltage of an inverter medium-frequency power supply can be changed by the conventional technology without manually adjusting and changing circuit parameters or changing input voltage, unless the power of the inverter medium-frequency power supply is far higher than the apparent power of a load capacitor. However, if the power of the inverter if power is much higher than the apparent power of the load capacitor, the if power is bulky and costly, which is not practical. However, if the circuit parameters are directly adjusted or the input voltage is changed, the technique is too complicated and is not practical. Therefore, many existing intermediate-frequency high-voltage electric field generating devices which require stable and unchangeable output voltage simultaneously with non-constant frequency, such as intermediate-frequency potential therapeutic apparatuses, do not actually perform voltage stabilization, and when load capacitance changes, the output voltage changes certainly, so that the name is unfit.
Disclosure of Invention
The present invention provides a capacitive variable load inverter high-voltage non-constant-frequency if power supply and a voltage stabilizing circuit thereof, so as to stabilize the voltage of the capacitive variable load inverter high-voltage non-constant-frequency if power supply, and further to implement an if high-voltage electric field generating device that requires stable and constant output voltage at the same time of non-constant frequency.
The technical scheme adopted by the invention for solving the technical problems is to provide a voltage stabilizing circuit of a capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply, which is arranged between an alternating-current voltage output end of the intermediate-frequency power supply and a power amplifier and comprises a sampling circuit, a summing circuit and a voltage-controlled oscillator, wherein the sampling circuit is connected between the alternating-current voltage output end and the summing circuit and is used for sampling an intermediate-frequency output voltage output by the alternating-current voltage output end and feeding back the obtained sampling voltage to the summing circuit; the summing circuit sums the sampling voltage and a direct current reference voltage to obtain a summed output voltage, and outputs the summed output voltage to the input end of the voltage-controlled oscillator, so that the oscillation frequency of the voltage-controlled oscillator tracks the intermediate frequency output voltage of the alternating current voltage output end and outputs an intermediate frequency driving signal to the driving input end of the power amplifier, and the resonant loop of the output unit of the power amplifier outputs the intermediate frequency output voltage to the alternating current voltage output end, wherein the resonant loop of the output unit comprises a capacitive variable load.
Preferably, the sampling voltage is an average voltage obtained by dividing, rectifying and integrating the intermediate frequency output voltage by the sampling circuit.
Preferably, the voltage stabilizing circuit further comprises a reference voltage circuit for generating the dc reference voltage.
Preferably, the sampling circuit is a proportional-integral circuit.
Preferably, the voltage-controlled oscillator is implemented by using a CD4046 chip.
Preferably, the power amplifier is a class D power amplifier.
Preferably, the class D power amplifier is a current switching class D power amplifier, and the output unit of the current switching class D power amplifier is a secondary resonant circuit of a step-up transformer.
Preferably, the output unit is in a resonant state when operating normally.
The invention also provides a capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply with the voltage stabilizing circuit, which comprises a power amplifier and an alternating-current voltage output end, wherein the voltage stabilizing circuit is arranged between the alternating-current voltage output end and the power amplifier.
The voltage stabilizing circuit of the capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply utilizes the intermediate-frequency output voltage output by the alternating voltage output end to form a feedback signal (sampling voltage), then the feedback signal (sampling voltage) is summed with a reference signal (direct current reference voltage) to obtain a summation output voltage, the frequency of the voltage controlled oscillator is adjusted based on the summation output voltage to track the intermediate-frequency output voltage of the alternating voltage output end and output an intermediate-frequency driving signal, the resonance of a resonance loop (comprising the capacitive variable load) of an output unit of a power amplifier can be maintained when the load capacitance of the capacitive variable load connected with the alternating voltage output end changes, the intermediate-frequency output voltage output by a power amplifier of the capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply has the function of stabilizing the voltage, and the voltage of the capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply is realized, therefore, the medium-frequency high-voltage electric field generating equipment which is not constant in frequency and simultaneously requires stable and unchanged output voltage can be realized.
Drawings
Fig. 1 is a schematic circuit block diagram of a capacitive variable load inverter high-voltage non-constant frequency intermediate frequency power supply of the present invention.
FIG. 2 is a block diagram of a voltage regulator circuit of the capacitive variable load inverter high-voltage non-constant frequency intermediate frequency power supply according to the present invention.
Fig. 3 is a schematic circuit diagram of an embodiment of the capacitive variable load inverter high-voltage non-constant frequency intermediate frequency power supply of the present invention.
Detailed Description
The invention relates to a capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and a voltage stabilizing circuit thereof, which are used for intermediate-frequency high-voltage electric field generating equipment requiring stable and unchanged output voltage at the same time of non-constant frequency, so that the power supply can also output stable voltage when a load capacitor changes in a certain range.
Fig. 1 is a schematic circuit block diagram of a capacitive variable load inverter high-voltage non-constant-frequency intermediate-frequency power supply according to the present invention. The intermediate frequency power supply 1 comprises a power amplifier 40, an alternating voltage output terminal 50 and a voltage stabilizing circuit 10, wherein the power amplifier 40 is used for generating an intermediate frequency high voltage signal which is output by the alternating voltage output terminal 50, and the voltage stabilizing circuit 10 is used for outputting an intermediate frequency driving signal to the power amplifier 40. Specifically, the voltage regulator circuit 10 of the present invention is disposed between the ac voltage output terminal 50 and the power amplifier 40, wherein an input terminal of the voltage regulator circuit is connected to the ac voltage output terminal 50, and an output terminal of the voltage regulator circuit is connected to a driving input terminal of the power amplifier 40, and a feedback signal is formed by using the intermediate frequency output voltage of the ac voltage output terminal 50, so as to further drive the power amplifier 40, maintain the resonance of the resonant circuit (including the capacitive variable load) of the output unit of the power amplifier 40, and achieve the purpose of stabilizing the output voltage.
As shown in FIG. 2, the voltage regulation circuit 10 includes a sampling circuit 11, a reference voltage circuit 12, a summing circuit 13, and a voltage controlled oscillator 14. The sampling circuit 11 is connected between the ac voltage output end 50 of the capacitive variable load inverter high-voltage non-constant frequency intermediate frequency power supply and the summing circuit 13, and is configured to sample the intermediate frequency output voltage output by the ac voltage output end 50 and feed back the sampled voltage to the summing circuit 13. The sampling voltage is an average voltage obtained by dividing, rectifying, and integrating the intermediate frequency output voltage by the sampling circuit 11, and is used as a detection signal. The other input terminal of the summing circuit 13 is connected to the reference voltage circuit 12, and after the sampled voltage is input to the summing circuit 13, the summing circuit 13 sums the sampled voltage and the dc reference voltage input from the reference voltage circuit 12 to obtain a summed output voltage. The output terminal of the summing circuit 13 is connected to the input terminal of the voltage-controlled oscillator 14, so that the summed output voltage outputted therefrom is inputted as a control voltage to the input terminal of the voltage-controlled oscillator 14 to adjust the oscillation frequency of the voltage-controlled oscillator 14 to track the intermediate frequency output voltage at the ac voltage output terminal 50, so that the voltage-controlled oscillator 14 outputs an intermediate frequency drive signal.
The intermediate frequency driving signal output by the voltage controlled oscillator 14 is used as the output signal of the voltage stabilizing circuit 10, and is input to the driving input terminal of the power amplifier 40 to drive the power amplifier 40, so that the ac voltage generated after the dc voltage is inverted can generate an intermediate frequency output voltage on the capacitive load of the power amplifier 40 to maintain the resonance of the resonant tank of the output unit.
Since the resonant tank of the output unit of the power amplifier 40 (composed of the transformer secondary equivalent inductance and the capacitive variable load, see fig. 3 for a specific example) resonates at the intermediate frequency, and the resonant frequency is the same as the frequency of the intermediate frequency driving signal, the voltage stabilizing circuit of the present invention utilizes the intermediate frequency output voltage sample outputted from the ac voltage output terminal 50 to form the feedback signal (sampling voltage), and then sums the feedback signal (sampling voltage) with a reference signal (dc reference voltage) to obtain a summed output voltage, and adjusts the frequency of the voltage controlled oscillator 14 based on the summed output voltage to track the intermediate frequency output voltage of the ac voltage output terminal 50 and output the intermediate frequency driving signal, so as to maintain the resonance of the resonant tank (including the capacitive variable load) of the output unit of the power amplifier 40 when the load capacitance of the capacitive variable load connected to the ac voltage output terminal 50 changes, the output unit of the power amplifier 40 is ensured to be in a resonance state when working normally, and the voltage stabilizing function is performed on the intermediate frequency output voltage output by the power amplifier 40.
The sampling circuit 11 of the present invention may be equivalent to a proportional-integral circuit, the voltage-controlled oscillator 14 may be implemented by a CD4046 chip, and the power amplifier 40 is a class D power amplifier, but is not limited thereto.
Based on this, the present invention provides a circuit schematic diagram of a specific embodiment of a capacitive variable load inverter high-voltage non-constant-frequency intermediate-frequency power supply, as shown in fig. 3, wherein the sampling circuit 11 is equivalent to a proportional-integral circuit, the voltage-controlled oscillator 14 is implemented by using a CD4046 chip, the power amplifier 40 is a current switching type class D power amplifier, and an output unit thereof is a secondary resonant circuit of a step-up transformer. The specific parameters of this embodiment may be that the dc input voltage at the dc voltage input terminal of the power amplifier is 44V, the output voltage of the intermediate frequency high voltage signal at the ac voltage output terminal is 1200V — 1200V, the center frequency of the output voltage is 85kHz, and the rated load capacitance is 66 pF. When the load capacitance is changed within the range of 0-200 pF, the output voltage error range of the intermediate frequency power supply is 10%, the output frequency change range is 93 kHz-55 kHz, and the input power of the intermediate frequency power supply is less than 20 VA.
Claims (5)
1. A capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply is characterized by comprising a power amplifier, an alternating voltage output end and a voltage stabilizing circuit, wherein the voltage stabilizing circuit is arranged between the alternating voltage output end and the power amplifier and comprises a sampling circuit, a summing circuit and a voltage-controlled oscillator, the sampling circuit is connected between the alternating voltage output end and the summing circuit and is used for sampling intermediate-frequency output voltage output by the alternating voltage output end and feeding back the obtained sampling voltage to the summing circuit; the summing circuit sums the sampling voltage and a direct current reference voltage to obtain a summed output voltage, and outputs the summed output voltage to the input end of the voltage-controlled oscillator, so that the oscillation frequency of the voltage-controlled oscillator tracks the intermediate-frequency output voltage of the alternating current voltage output end and outputs an intermediate-frequency driving signal to the driving input end of the power amplifier, and further drives the power amplifier, so that the resonance of a resonance loop of an output unit of the power amplifier is maintained, the output unit of the power amplifier is ensured to be in a resonance state when working normally, and the voltage stabilization effect is achieved on the intermediate-frequency output voltage output by the power amplifier; the resonant circuit of the output unit of the power amplifier outputs the intermediate frequency output voltage to the alternating current voltage output end, wherein the resonant circuit of the output unit comprises a capacitive variable load;
The voltage stabilizing circuit also comprises a reference voltage circuit used for generating the direct current reference voltage;
The sampling voltage is an average voltage obtained by dividing, rectifying and integrating the intermediate frequency output voltage by the sampling circuit.
2. The capacitive variable load inverting high-voltage non-constant frequency intermediate-frequency power supply according to claim 1, wherein the sampling circuit is a proportional-integral circuit.
3. The capacitive variable load inverting high-voltage non-constant frequency intermediate-frequency power supply according to claim 1, wherein the voltage-controlled oscillator is implemented by using a CD4046 chip.
4. the capacitively variable load inverting high voltage non-constant frequency intermediate frequency power supply of claim 1 wherein said power amplifier is a class D power amplifier.
5. The capacitive variable load inverting high-voltage non-constant frequency intermediate-frequency power supply according to claim 4, wherein the class D power amplifier is a current switching type class D power amplifier, and an output unit of the current switching type class D power amplifier is a booster transformer secondary resonant circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710797194.6A CN107612406B (en) | 2017-09-06 | 2017-09-06 | Capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and voltage stabilizing circuit thereof |
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| CN201710797194.6A CN107612406B (en) | 2017-09-06 | 2017-09-06 | Capacitive variable load inversion high-voltage non-constant-frequency intermediate-frequency power supply and voltage stabilizing circuit thereof |
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| CN107612406B true CN107612406B (en) | 2019-12-10 |
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| CN112234857A (en) * | 2020-11-06 | 2021-01-15 | 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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| CN2388632Y (en) * | 1999-06-08 | 2000-07-19 | 镒福电子股份有限公司 | AC power supply manostat |
| CN2509581Y (en) * | 2001-10-26 | 2002-09-04 | 辽宁仪表研究所 | X-ray defects detector for charging of accumulator cell |
| JP2007295761A (en) * | 2006-04-27 | 2007-11-08 | Matsushita Electric Ind Co Ltd | Switching power supply |
| CN103840646B (en) * | 2012-11-23 | 2017-03-01 | 南京博兰得电子科技有限公司 | A kind of resonant transformation device |
| CN106452090A (en) * | 2016-11-28 | 2017-02-22 | 福州大学 | Closed-loop control system for LLC half-bridge resonance converter and system-control method |
| CN207251498U (en) * | 2017-09-06 | 2018-04-17 | 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 regulator circuit |
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