CN202713167U - AC power supply - Google Patents
AC power supply Download PDFInfo
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- CN202713167U CN202713167U CN 201220389246 CN201220389246U CN202713167U CN 202713167 U CN202713167 U CN 202713167U CN 201220389246 CN201220389246 CN 201220389246 CN 201220389246 U CN201220389246 U CN 201220389246U CN 202713167 U CN202713167 U CN 202713167U
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Abstract
The utility model discloses an AC power supply, comprising a power supply, a control system, a DDS circuit, a primary filtering circuit, a voltage amplifying circuit, a power amplifying circuit, a secondary filtering circuit, an isolation transformer, a sampling transformer, a voltage conditioning circuit, an input/output device and a signal acquisition circuit. According to the AC power supply provided by the utility model, the requirements for high precision of output voltage, small distortion of sine wave and frequency capable of reaching several hundred KHz of industrial measurement sensors can be met. The sine wave AC power supply can change the output frequency conveniently and flexibly, so as to meet different requirements; and the AC power supply further has the advantages of simple design of circuits, low manufacturing cost, and suitability for large-scale popularization and application.
Description
Technical field
The utility model belongs to the integrated field of measuring technique of electromagnetism, is specifically related to a kind of AC power.
Background technology
In the AC applications occasion, most of loads need sine-wave power, along with developing rapidly of power electronic technology and power semiconductor, the power supply of high_frequency sine wave output can be realized.The high_frequency sine wave power supply has a wide range of applications at aspects such as machinery, light industry, energy-saving and environmental protection, medical treatment, wherein high accuracy high_frequency sine wave power supply transducer that commercial measurement is used is particularly important, can be widely used in electromagnetic pressure transducer, inductance sensor, capacitance sensor etc., certainty of measurement can not only be improved, and performance and the volume of measuring system can be improved.
In order to guarantee certainty of measurement, the requirement of commercial measurement transducer offset of sinusoidal ripple power supply is very high, and generally will reach the Voltage-output precision is 5 ‰, and the sinusoidal wave distortion factor is less than 0.1%, and frequency is up to the standard of hundreds of KHz.Present widely used sinusoidal wave pulse modulation (SPWM) technology makes sine-wave power surpass large capacity, high efficiency, high-performance, modular future development.But along with offset of sinusoidal ripple power supply high-frequency and high-precision requirement, sinusoidal wave pulse modulation (SPWM) technology just is difficult to realize.Because along with the requirement of frequency and precision is more and more higher, the carrier wave ratio of sinusoidal wave pulse modulation (SPWM) technology is also just larger, but excessive carrier wave ratio means high switching frequency, can bring very large switching loss in the high frequency applications occasion, even does not have device available.This has brought very large puzzlement with regard to the practical application of giving the commercial measurement transducer, has limited to a great extent the development of commercial measurement transducer.
Summary of the invention
The purpose of this utility model is to solve the problems of the technologies described above, and a kind of AC power that is applied to the commercial measurement electromagnetic sensor is provided.By adopting synthetic (DDS) technology of numerical frequency, through twice filtering, power amplification, two-way Voltage Feedback, thereby guarantee Voltage-output precision and the sinusoidal wave distortion factor, satisfy the requirement of commercial measurement transducer.
A kind of AC power comprises power supply, control system, DDS circuit, filter circuit, voltage amplifier circuit, power amplification circuit, secondary filtering circuit, isolating transformer, sampling transformer, voltage modulate circuit, input-output equipment, signal acquisition circuit;
Power supply provides power supply for control system, DDS circuit, filter circuit, voltage amplifier circuit, power amplification circuit, secondary filtering circuit, voltage modulate circuit, input-output equipment, a signal acquisition circuit; The user sets sinusoidal wave by input-output equipment, input-output equipment also shows the information of AC power source of sine wave output voltage of the present utility model, and the sinusoidal wave information output that input-output equipment is set the user is to control system; The sinusoidal wave information that control system is set according to the user sends the sinewave output instruction to signal generator DDS circuit, and signal generator DDS circuit exports filter circuit to No. one time according to the sine wave signal of instruction output customer requirements;
No. one time filter circuit offset of sinusoidal ripple signal carries out filtering, and filtered sine wave signal exports voltage amplifier circuit to; Voltage amplifier circuit offset of sinusoidal ripple signal carries out voltage amplification, sine wave signal after the amplification inputs to power amplification circuit, power amplification circuit offset of sinusoidal ripple signal carries out electric current and amplifies, and the sine wave signal that process voltage amplification and electric current amplify exports the secondary filtering circuit to; Wherein, in voltage amplifier circuit, modulate circuit inputs to voltage amplifier circuit with sinusoidal wave feedback signal, and sine wave signal and sinusoidal wave feedback signal are connected to the in-phase input end of voltage amplifier circuit simultaneously, realizes feedback;
The secondary filtering circuit carries out secondary filtering to the sine wave signal that amplifies through electric current and voltage, and the sine wave signal behind the secondary filtering exports isolating transformer to; The primary coil connecting secondary filter circuit of isolating transformer, the first secondary coil connects the primary coil of load and sampling transformer; The Same Name of Ends of secondary coil is connected to the inverting input of amplifier in the voltage modulate circuit in the sampling transformer, and the different name end of secondary coil is connected to the in-phase input end of amplifier in the voltage modulate circuit, and the signal of sampling transformer collection obtains anti-phase sinusoidal wave feedback signal through the overvoltage modulate circuit; This sine wave signal feeds back to voltage amplifier circuit;
Signal acquisition circuit gathers the voltage of power amplification circuit output, the voltage sampling signal that obtains is delivered to control system through the A/D sample circuit, control system calculates controlled quentity controlled variable through increment type PID algorithm, according to controlled quentity controlled variable, the control system output pwm signal, obtain direct current signal through filter circuit, give the DDS generator, realize amplitude modulation;
Described input-output equipment comprises button and LCDs, and the user can be by frequency, the phase information of pressing the key assignments sine wave, and LCDs shows output frequency, phase place and the amplitude of AC power source of sine wave output voltage of the present invention;
The utility model has the advantage of:
(1) a kind of AC power of the present utility model can satisfy that the desired output voltage precision of commercial measurement transducer is high, the sinusoidal wave distortion factor is little, and frequency can reach the requirement of hundreds of KHz;
(2) a kind of AC power of the present utility model can change output frequency easily and flexibly, meets the different needs;
(3) circuit design of the present utility model is simple, and low cost of manufacture is fit to large-scale promotion and uses.
Description of drawings
A kind of AC power theory diagram that Fig. 1 the utility model provides;
A kind of AC power hardware feedback circuit figure that Fig. 2 the utility model provides;
Among the figure:
1 power supply, 2 control system, 3 DDS circuit
No. 4 filter circuit 5 voltage amplifier circuits 6 power amplification circuits
7 secondary filtering circuit, 8 isolating transformers, 9 sampling transformers
12 loads of 10 voltage modulate circuits, 11 input-output equipment
13 signal acquisition circuits
101 sine wave signals, 102 sinusoidal wave feedback signal 801 primary coils
802 first secondary coils, 803 second subprime coils, 804 high frequency magnetic cores
901 primary coils, 902 secondary coils, 903 high frequency magnetic cores
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
The utility model provides a kind of AC power, as shown in Figure 1, comprise power supply 1, control system 2, DDS circuit 3, filter circuit 4, voltage amplifier circuit 5, power amplification circuit 6, secondary filtering circuit 7, isolating transformer 8, sampling transformer 9, voltage modulate circuit 10, input-output equipment 11, signal acquisition circuit 13.
Input-output equipment 11 comprises button and LCDs, the user can be by the information such as frequency, phase place of pressing the key assignments sine wave, LCDs shows output frequency, phase place and the amplitude etc. of AC power source of sine wave output voltage of the present utility model, and the sinusoidal wave information output that input-output equipment 11 is set the user is to control system 2.
Control system 2 adopts the AVR microcontroller, the sinusoidal wave information that control system 2 is set according to the user, send the sinewave output instruction by the SPI interface to signal generator DDS circuit 3, signal generator DDS circuit 3 exports filter circuit 4 to No. one time according to the sine wave signal of instruction output frequency that the user requires, phase place.
The Butterworth low-pass filtering that filter circuit 4 is active quadravalence Sallen-Key topology and high-pass filtering form, sine wave signal inputs to filter circuit 4 No. one time, No. one time filter circuit 4 reduces the spuious of sine wave signal, make waveform cleaner, filter simultaneously the direct voltage that it contains, filtered sine wave signal 101 exports voltage amplifier circuit 5 to.
As shown in Figure 2, voltage amplifier circuit 5 offset of sinusoidal ripple signals 101 carry out voltage amplification, sine wave signal 101 after the amplification inputs to power amplification circuit 6, power amplification circuit 6 offset of sinusoidal ripple signals 101 carry out electric current and amplify, it is in order to satisfy the user to the requirement of output voltage and power that voltage amplification and electric current amplify, power amplification circuit 6 can be selected the power amplification circuit of power amplification chip or discrete component according to conditions such as power and frequencies, in order to safeguard the stability of power amplification circuit work, need a feedback loop that feeds back to input from power amplification circuit output.Sine wave signal 101 through voltage amplification and electric current amplification exports secondary filtering circuit 7 to.
Wherein, in voltage amplifier circuit 5, modulate circuit 10 inputs to voltage amplifier circuit 5 with sinusoidal wave feedback signal 102, sine wave signal 101 and sinusoidal wave feedback signal 102 are connected to the in-phase input end of voltage amplifier circuit 5 simultaneously by resistance, because 180 ° of sine wave signal 101 and sinusoidal wave feedback signal 102 phase differences, do subtraction so be equivalent to two signals, thereby realize feedback.
As shown in Figure 2, secondary filtering circuit 7 is comprised of Schottky diode, inductance, electric capacity, and its connected mode is seen secondary filtering circuit 7 block diagrams among Fig. 2.7 pairs of sine wave signals 101 that amplify through electric current and voltage of secondary filtering circuit carry out secondary filtering, weaken the distortion of sine wave signal 101 waveforms after the power amplification, satisfy the requirement of the sinusoidal wave distortion factor, the sine wave signal 101 behind the secondary filtering exports isolating transformer 8 to.
As shown in Figure 2, isolating transformer 8 is comprised of high frequency magnetic core 804, primary coil 801, the first secondary coil 802, second subprime coil 803, isolating transformer 8 adopts the mode of PCB type flat surface transformer, primary coil 801, the first secondary coil 802, second subprime coil 803 are printed on respectively on the different layers of 3 layers of PCB, then overlay on the high frequency magnetic core 804.Primary coil 801 connecting secondary filter circuits 7, primary coil 801 is determined by the voltage that load 12 requires that with the turn ratio of secondary coil 802 primary coil 801 is 10:1 with the turn ratio of secondary coil 803.The first secondary coil 802 connects the primary coil 901 of loads 8 and sampling transformer 9, has so not only realized the electrical isolation effect of power supply 1 and load 12, and output voltage that can the described AC power source of sine wave of Real-time Obtaining.Secondary coil 802 also provides a synchronizing signal for the follow-up signal processing circuit of commercial measurement transducer.
Voltage feedback section in the utility model has adopted the two-way Voltage Feedback as depicted in figs. 1 and 2.One the tunnel is sampling transformer 9, and another road is signal acquisition circuit 13.
Sampling transformer 9 is comprised of high frequency magnetic core 903, primary coil 901, secondary coil 902, sampling transformer 9 adopts the mode of PCB type flat surface transformer, primary coil 901 and secondary coil 902 are printed on respectively on the different layers of 2 layers of PCB, then overlay on the high frequency magnetic core 903.Primary coil 901 is 5:2 with the turn ratio of secondary coil 902, can obtain in real time because load 12 changes the variation of power amplification circuit 6 output voltages that cause by sampling transformer 9.The Same Name of Ends of secondary coil 901 is connected to the inverting input of amplifier in the voltage modulate circuit 10, and the different name end of secondary coil 901 is connected to the in-phase input end of amplifier in the voltage modulate circuit 10, utilize the ratio of input resistance and feedback resistance to adjust sampled signal, like this signal of sampling transformer 9 collections through overvoltage modulate circuit 10 just obtain anti-phase-15V～+ the sinusoidal wave feedback signal 102 of 15V.Sine wave signal 102 feeds back to voltage amplifier circuit 5, is used for regulating the variation that changes the described AC power source of sine wave output voltage that causes owing to load 12.
Signal acquisition circuit 13 adopts the real effective detection chip to gather the voltage of power amplification circuit 6 outputs, the voltage sampling signal that obtains is delivered to control system 2 through the A/D sample circuit, control system 2 calculates controlled quentity controlled variable through increment type PID algorithm, obtain direct current signal according to controlled quentity controlled variable control system 2 output pwm signals through filter circuit and give DDS generator 3, realize amplitude modulation.By this two-way Voltage Feedback, a kind of middle low power high accuracy high_frequency sine wave AC power of the present utility model can realize that the Voltage-output precision is 5 ‰ requirement, satisfies the requirement of commercial measurement transducer offset of sinusoidal ripple power supply fully.
Because supply frequency is high, isolating transformer 8 and sampling transformer 9 adopt the mode of PCB type flat surface transformer, can significantly reduce the height of transformer, reduce the volume and weight of transformer, improve the power density of transformer, realize supply unit " light, little, thin ".High frequency magnetic core 804 and high frequency magnetic core 903 are made by the producer of professional production high frequency magnetic core.Power amplification circuit 6 arranges board edge near cabinet as far as possible, can dispel the heat by metal chassis.
Control system 2 of the present utility model sends the instructions such as output waveform, frequency, phase place by data wire to signal generator DDS circuit 3, and signal generator DDS circuit 3 is according to the sine wave of the instruction output frequency plot that requires.This sine wave is exported to load 12 through filter circuit 4, voltage amplifier circuit 5, power amplification circuit 6, secondary filtering circuit 7 and an isolating transformer 8.In order to guarantee the sinusoidal wave distortion factor, the utility model has adopted filter circuit twice.Filter circuit is harmonic components and the flip-flop of filtering DDS output signal for the first time.Filter circuit is that filtering is because power amplification circuit 6 and load 12 caused wave distortions guarantee the distortion factor for the second time.In order to guarantee the Voltage-output precision, the utility model has adopted the two-way Voltage Feedback, one road Voltage Feedback is realized by hardware, the signal feedback that obtains through isolating transformer 8, sampling transformer 9, voltage modulate circuit 10 arrives voltage amplifier circuit 5, this feedback is real-time, the adjusting surplus is large, belongs to coarse adjustment.Another road Voltage Feedback is realized by software, deliver to control system 2 by the voltage sampling signal that signal acquisition circuit 13 obtains through the A/D circuit, control system 2 calculates controlled quentity controlled variable through increment type PID algorithm, PWM function by control system obtains direct current signal through filter circuit and gives DDS circuit 3, realize amplitude modulation, this feedback is digital regulated, and is very accurate, adjustable range is little, belongs to fine tuning.
Claims (6)
1. AC power, it is characterized in that, comprise power supply, control system, DDS circuit, filter circuit, voltage amplifier circuit, power amplification circuit, secondary filtering circuit, isolating transformer, sampling transformer, voltage modulate circuit, input-output equipment, signal acquisition circuit;
Power supply provides power supply for control system, DDS circuit, filter circuit, voltage amplifier circuit, power amplification circuit, secondary filtering circuit, voltage modulate circuit, input-output equipment, a signal acquisition circuit; The user sets sinusoidal wave by input-output equipment, input-output equipment also shows the information of AC power source of sine wave output voltage of the present invention, and the sinusoidal wave information output that input-output equipment is set the user is to control system; The sinusoidal wave information that control system is set according to the user sends the sinewave output instruction to signal generator DDS circuit, and signal generator DDS circuit exports filter circuit to No. one time according to the sine wave signal of instruction output customer requirements;
No. one time filter circuit offset of sinusoidal ripple signal carries out filtering, and filtered sine wave signal exports voltage amplifier circuit to; Voltage amplifier circuit offset of sinusoidal ripple signal carries out voltage amplification, sine wave signal after the amplification inputs to power amplification circuit, power amplification circuit offset of sinusoidal ripple signal carries out electric current and amplifies, and the sine wave signal that process voltage amplification and electric current amplify exports the secondary filtering circuit to; Wherein, in voltage amplifier circuit, modulate circuit inputs to voltage amplifier circuit with sinusoidal wave feedback signal, and sine wave signal and sinusoidal wave feedback signal are connected to the in-phase input end of voltage amplifier circuit simultaneously, realizes feedback;
The secondary filtering circuit carries out secondary filtering to the sine wave signal that amplifies through electric current and voltage, and the sine wave signal behind the secondary filtering exports isolating transformer to; The primary coil connecting secondary filter circuit of isolating transformer, the first secondary coil connects the primary coil of load and sampling transformer; The Same Name of Ends of secondary coil is connected to the inverting input of amplifier in the voltage modulate circuit in the sampling transformer, and the different name end of secondary coil is connected to the in-phase input end of amplifier in the voltage modulate circuit, and the signal of sampling transformer collection obtains anti-phase sinusoidal wave feedback signal through the overvoltage modulate circuit; This sine wave signal feeds back to voltage amplifier circuit;
Signal acquisition circuit gathers the voltage of power amplification circuit output, the voltage sampling signal that obtains is delivered to control system through the A/D sample circuit, control system calculates controlled quentity controlled variable through increment type PID algorithm, according to controlled quentity controlled variable, the control system output pwm signal, obtain direct current signal through filter circuit, give the DDS generator, realize amplitude modulation;
Described input-output equipment comprises button and LCDs, and the user can be by frequency, the phase information of pressing the key assignments sine wave, and LCDs shows output frequency, phase place and the amplitude of AC power source of sine wave output voltage of the present invention.
2. a kind of AC power according to claim 1, it is characterized in that, described circuit adopts the mode of separating power supply, power supply provides ± the 32V power supply for power amplification circuit, for control system, DDS circuit, input-output equipment provide ± the 5V power supply, filter circuit, voltage amplifier circuit, secondary filtering circuit, voltage modulate circuit, signal acquisition circuit provide ± the 15V power supply for No. one time.
3. a kind of AC power according to claim 1 is characterized in that, the Butterworth low-pass filtering that a described filter circuit is active quadravalence Sallen-Key topology and high-pass filtering form.
4. a kind of AC power according to claim 1, it is characterized in that, described isolating transformer is comprised of high frequency magnetic core, primary coil, the first secondary coil, second subprime coil, isolating transformer adopts the mode of PCB type flat surface transformer, primary coil, the first secondary coil, second subprime coil are printed on respectively on the different layers of 3 layers of PCB, then overlay on the high frequency magnetic core; The turn ratio of primary coil and secondary coil determines that by the voltage of load request the turn ratio of primary coil and secondary coil is 10:1; Secondary coil provides a synchronizing signal for the follow-up signal processing circuit of commercial measurement transducer.
5. a kind of AC power according to claim 1, it is characterized in that, described sampling transformer is comprised of high frequency magnetic core, primary coil, secondary coil, sampling transformer adopts the mode of PCB type flat surface transformer, primary coil and secondary coil are printed on respectively on the different layers of 2 layers of PCB, then overlay on the high frequency magnetic core; The turn ratio of primary coil and secondary coil is 5:2, obtains in real time because the variation of the power amplification circuit output voltage that load variations causes by sampling transformer.
6. a kind of AC power according to claim 1 is characterized in that, the board edge of described power amplification circuit can dispel the heat by metal chassis near cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389246 CN202713167U (en) | 2012-08-07 | 2012-08-07 | AC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220389246 CN202713167U (en) | 2012-08-07 | 2012-08-07 | AC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713167U true CN202713167U (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220389246 Expired - Fee Related CN202713167U (en) | 2012-08-07 | 2012-08-07 | AC power supply |
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| Country | Link |
|---|---|
| CN (1) | CN202713167U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107516994A (en) * | 2017-10-10 | 2017-12-26 | 厦门市爱维达电子有限公司 | A kind of self-powered inverter IGBT drive devices based on Magnetic isolation |
| CN112615536A (en) * | 2020-12-16 | 2021-04-06 | 河南海格经纬信息技术有限公司 | High-precision program-controlled three-phase alternating current power supply |
-
2012
- 2012-08-07 CN CN 201220389246 patent/CN202713167U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107516994A (en) * | 2017-10-10 | 2017-12-26 | 厦门市爱维达电子有限公司 | A kind of self-powered inverter IGBT drive devices based on Magnetic isolation |
| CN107516994B (en) * | 2017-10-10 | 2019-10-25 | 厦门市爱维达电子有限公司 | A kind of self-powered inverter IGBT driving device based on Magnetic isolation |
| CN112615536A (en) * | 2020-12-16 | 2021-04-06 | 河南海格经纬信息技术有限公司 | High-precision program-controlled three-phase alternating current power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20160807 |