CN102955486A - High-voltage large-power frequency conversion adjustable constant voltage source - Google Patents
High-voltage large-power frequency conversion adjustable constant voltage source Download PDFInfo
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Abstract
The invention relates to a high-voltage large-power frequency conversion adjustable constant voltage source which comprises a signal generator and N signal processing circuits, wherein power sources for inner components of any two signal processing circuits are not grounded; each signal processing circuit is composed of a digital isolation switching circuit and a power amplifier module; a signal generated by the signal generator is synchronously output to all the signal processing circuits; after the signal is firstly processed by the digital isolation switching circuits of all the signal processing circuit, N high-precision isolated low-voltage alternate current signals are output, wherein N is an integer which is not less than 1; all the low-voltage alternating current signals are the same in amplitude, frequency and phase, and the amplitude and frequency of all the low-voltage alternating current signal can be synchronously adjusted; and all the low-voltage alternating current signals are output to the corresponding power amplifier modules treatment be amplified; and output ends of N power amplifier modules are sequentially connected in series so as to be utilized as the total output of the constant voltage source. The constant voltage source provided by the invention has the advantages that the output voltage and power accuracy is high, and the amplitude regulating range is large.
Description
Technical field
The present invention relates to a kind of high-power frequency conversion adjustable constant voltage source, belong to power electronics renovation technique field.
Background technology
In recent years, along with the quickening of world economic integration process and the fast development of some special industries, the application of frequency conversion variable voltage source is more and more extensive, and people have had higher requirement to quality, function, performance index, intelligent degree and the cost of frequency conversion regulated power supply.Yet, the power supply product that grows up based on Analogical Circuit Technique, performance can not get improving, quality can not be guaranteed, function has not satisfied the demand that people use yet, this situation has had a strong impact on the development of relevant industries and the progress of technology, therefore, the intelligentized frequency conversion variable voltage source of research high-performance has very important realistic meaning.
Frequency conversion variable voltage source major part is achieved in that the employing inversion transformation technique at present, with the AC → DC → AC conversion of the process of the alternating current in the civil power, the product that adopts this technology to obtain can be exported purer sine wave, and output frequency and voltage are adjustable within the specific limits.But adopt the amplitude of the variable-frequency electric potential source that this technology obtains and the range of adjustment of frequency to be subject to certain restrictions, major part can only be exported below the 300V, the voltage signal of frequency between 40-400HZ, and less stable, the precision of output is not high, and major part is no more than 0.5%.
Summary of the invention
Technical matters to be solved by this invention just provides the high-power frequency conversion adjustable constant voltage source that a kind of amplitude adjusted scope is large, precision is high.
Technical matters to be solved by this invention is achieved through the following technical solutions: a kind of high-power frequency conversion adjustable constant voltage source, it is characterized in that, comprise signal generator and N road signal processing circuit, the power supply of two paths of signals treatment circuit inner member is not altogether arbitrarily;
The described signal processing circuit in every road is made of railway digital isolation change-over circuit and a power amplifier module;
The signal that signal generator produces outputs to each road signal processing circuit synchronously, first after the numeral isolation change-over circuit of each road signal processing circuit is processed, the small voltage AC signal of output N road high precision, isolation, N is integer, and N 〉=1, the described small voltage AC signal in each road has identical amplitude, frequency and phase place, and amplitude and the Frequency Synchronization of each road small voltage AC signal are adjustable;
The described small voltage AC signal in each road outputs to finish in the corresponding power amplifier module again and amplify to process, after the output terminal of the described power amplifier module in N road is connected successively as total output of described constant pressure source.
Each road signal processing circuit of the present invention is isolated from each other not altogether, and separately power supply is carried out separately signal and processed, and antijamming capability is strong, and precision is high.In addition, so the general direct employing civil power of the input of the frequency conversion variable voltage source that the available technology adopting inversion transformation technique is made, and civil power is subject to the impact that whole electrical network disturbs is the occasion of the high precision variable-frequency constant potential source that is difficult to satisfy the demand.Constant pressure source of the present invention produces signal by signal generator, relatively stable, and with the series connection formal output, make the output voltage sum that always is output as each power amplifier module of constant pressure source, thereby greatly increased the output power of constant pressure source of the present invention and the adjustable extent of output voltage at last.
As a preferred embodiment of the present invention, described power amplifier module is mainly by instrument amplifier U1, power amplifier U2 and transformer T1 form, described small voltage AC signal is input to two input ends of described instrument amplifier U1 with differential mode, output to again the inverting input of power amplifier U2 by arm resistance R1, the in-phase input end of power amplifier U2 is by balance resistance R4 ground connection, the output terminal of power amplifier U2 links to each other with an end of transformer T1 primary side, the other end ground connection of transformer T1 primary side, two output terminals of transformer T1 secondary side are drawn two output terminal U1+ as this road power amplifier module, U1-is in order to be in series with the output terminal of other power amplifier module;
Described power amplifier module also comprises feedback circuit and low-pass filter circuit, described feedback circuit is located between the inverting input of an end U1+ of transformer T1 secondary side and power amplifier U2, described feedback circuit is made of feedback resistance R2, and described low-pass filter circuit is connected between the output terminal and its in-phase input end of power amplifier U2.
Because being the output voltage addition by N road power amplifier module, the high pressure exported of constant pressure source of the present invention obtains, less demanding for the voltage gain of single power amplifier module, can better guarantee the output of high frequency.This be because, under normal circumstances, transformer is when transmitting AC signal, the frequency of the AC signal of exporting is higher, amplitude is larger, the transformer internal loss is also higher, and the easier concussion that causes power amplifier is not so only the amplitude of guaranteed output signal is in the very high situation, the output of guarantee high frequency increases the frequency adjustable extent of constant pressure source of the present invention.
The present invention utilizes instrument amplifier U1 that the small voltage AC signal of input is carried out difference processing, offset the interference between in-phase input end and the inverting input, make the signal distortion of output little, when utilizing power amplifier U2 that the little signal of above-mentioned degree of distortion is amplified processing, between the output terminal of power amplifier U2 and input end, low-pass filter circuit is set, the direct current component of the amplifying signal of filtering power amplifier U2 output, guarantee that the output of transformer T1 is at the state of a linearity, the present invention also is arranged on an end of the feedback circuit of power amplifier U2 the output terminal of transformer T1, make the output of transformer T1 more stable, not affected by load variations, thereby make constant pressure source of the present invention can keep high precision output.
As a kind of embodiment of the present invention, described low-pass filter circuit is made of amplifier U3, resistance R 3 and capacitor C 1, the inverting input of amplifier U3 connects the output terminal of power amplifier U2, its in-phase input end ground connection, its output terminal links to each other with the in-phase input end of power amplifier U2, and described resistance R 3 and capacitor C 1 are connected in parallel on respectively between the inverting input and its output terminal of amplifier U3.
Also be provided with phase compensating circuit between one end of described transformer T1 secondary side connection feedback circuit and the output terminal of power amplifier U2, described phase compensating circuit is made of capacitor C, makes the duty of power amplifier U2 more stable.
Described transformer T1 secondary side is different from an end ground connection that is connected with described feedback circuit, to strengthen Systems balanth.
Below 220V, in order to can make constant pressure source of the present invention can guarantee frequency output up to 1050HZ, and output accuracy can reach 0.05% through the amplitude of the voltage signal of described power amplifier module output.
Described arm resistance R1 and feedback resistance R2 adopt the precision resister of 1PPM, with high precision and the stability of guaranteed output amplifier U2 output.
As the preferred embodiment of the invention, described signal generator is dsp processor, described numeral isolation change-over circuit is formed by connecting in turn by a digital isolator, a digital to analog converter and a prime amplifier U4 who is provided with the negative-feedback circuit that is made of resistance R, also is provided with on the described dsp processor and is convenient to the RS232 interface that it links to each other with external computer equipment.
The present invention utilizes dsp processor to produce one road stable digital signal, then this railway digital signal being outputed to synchronously N digital isolator is isolated from each other each road signal through its output not interfere with each other, and utilize the N road circuit with same composition that described digital signal is processed respectively, not only can well guarantee the precision through the ac voltage signal of power amplifier module output, and make the described ac voltage signal in each road of preparing series connection output have identical frequency, phase place, amplitude, waveform distortions etc. make finally by the high-voltage signal of crossing constant pressure source output and can superpose fully.
Relative prior art, the present invention has following beneficial effect: 1) the present invention produces signal by signal generator, output to synchronously N road signal processing circuit, each road signal processing circuit is isolated from each other not altogether, and separately power supply is carried out separately signal and processed, relative prior art, not only the signal of input signal processing circuit is more stable, and the antijamming capability of each signal processing circuit is strong, is beneficial to improve output accuracy of the present invention; Constant pressure source of the present invention is with the series connection formal output, and the voltage of output and power are voltage and the power sum of each power amplifier module output, has greatly increased the adjustable extent of gross output of the present invention and total output voltage;
2) power amplifier module of the present invention arranges instrument amplifier, feedback circuit, low-pass filter circuit etc., to reduce waveform distortion, has improved output accuracy; Output high pressure of the present invention is to be stacked up by the voltage that the multichannel power amplifier module is exported, requirement to every road power amplifier module output voltage amplitude is lowered, in order to can when guaranteeing precision, the output by restriction single channel power amplifier module obtain higher output frequency, make constant pressure source of the present invention export a kind of amplitude and the frequency adjustable extent is large, the high-power voltage signal that precision is high, through test, the present invention in one embodiment can output amplitude up to 1600V, frequency is adjustable in 40 ~ 1050HZ scope, precision can reach 0.05% high power AC voltage signal;
3) the present invention utilizes dsp processor to produce digital signal, by digital isolator digital signal is split up into again the signal output of N road isolation, take full advantage of the characteristics of dsp processor, make that small voltage AC signal precision by described numeral isolation change-over circuit output is high, frequency-tuning range is large, stable be difficult for disturbed; In addition, adopt dsp processor as signal generator, thereby convenient linking to each other with external computer equipment realize programmed control, its output of Lookup protocol makes described constant pressure source more intelligent.
Description of drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the schematic diagram (only drawing one road power amplifier module) of the power amplifier module of preferred embodiment of the present invention;
Fig. 3 is the theory diagram of the numeral isolation change-over circuit of preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
As shown in Figures 1 to 3, high-power frequency conversion adjustable constant voltage of the present invention source comprises signal generator and N road signal processing circuit, the power supply of two paths of signals treatment circuit inner member is not altogether arbitrarily, specifically adopt different Switching Power Supplies to power to reach not the altogether purpose on ground, can not make things convenient for altogether and finally realize series connection.Every road signal processing circuit is made of railway digital isolation change-over circuit and a power amplifier module.
The signal that signal generator produces outputs to each road signal processing circuit synchronously, first after the numeral isolation change-over circuit of each road signal processing circuit is processed, (N is integer to output N, and N 〉=1) the small voltage AC signal of road high precision, isolation, each road small voltage AC signal has identical amplitude, frequency and phase place, and amplitude and the Frequency Synchronization of each road small voltage AC signal are adjustable.
As shown in Figure 1, output to again to finish the corresponding power amplifier module to amplify from each road small voltage AC signal of numeral isolation change-over circuit output and process and output voltage OUTn+ and OUTn-, n is the integer between 1 ~ N, the output terminal of N road power amplifier module joins end to end, be OUT(n-1)-output terminal link to each other successively with the output terminal of OUTn+, realize series connection output with this, final total positive output end take output terminal OUT1+ as constant pressure source of the present invention, total negative output terminal of OUTN-constant pressure source of the present invention.The voltage of the final output of constant pressure source of the present invention is the voltage sum of N power amplifier module output, and power is the power sum of N power amplifier module output.
As shown in Figure 1, 2, in the present embodiment, signal generator is dsp processor, dsp processor is a kind of digital signal processor, it is not only programmable, and has powerful data-handling capacity and very high travelling speed, and is subjected to the external factor such as temperature, environment to affect little.As shown in Figure 3, the digital signal that dsp processor produces, adopt parallel way to output to respectively in the N railway digital isolation change-over circuit by data bus, be provided with on the dsp processor and be convenient to the RS232 interface that it links to each other with external computer equipment, be convenient to realize programmed control, thereby make constant pressure source of the present invention more intelligent.
Numeral isolation change-over circuit is made of a digital isolator, a digital to analog converter and a prime amplifier U4 who is provided with the negative-feedback circuit that is made of resistance R.In the present embodiment, described digital to analog converter is 16 DAC, and the output terminal of described digital isolator outputs to 16 DAC by data bus to carry out digital-to-analog conversion and output to prime amplifier U4 again and form high-precision small voltage AC signal.Because the small voltage AC signal through the output of numeral isolation change-over circuit all is to be transformed by same signal, so the small voltage AC signal of described numeral isolation change-over circuit output has identical amplitude, frequency and phase place through each road, and amplitude and the Frequency Synchronization of each road small voltage AC signal are adjustable.
The structure of the power amplifier module of present embodiment as shown in Figure 2, power amplifier module comprises instrument amplifier U1, power amplifier U2 and transformer T1.Described small voltage AC signal is input to two input ends of described instrument amplifier U1 with differential mode, output to again the inverting input of power amplifier U2 by arm resistance R1, the in-phase input end of power amplifier U2 is by balance resistance R4 ground connection, and the effect of balance resistance mainly is the coupling for the input impedance of guaranteed output amplifier U2 input end.The output terminal of power amplifier U2 links to each other with an end of transformer T1 primary side, the other end ground connection of transformer T1 primary side, two output terminals of transformer T1 secondary side are drawn as two output terminal U1+, the U1-of this road power amplifier module in order to be in series with the output terminal of other power amplifier module.
Power amplifier module also comprises feedback circuit, low-pass filter circuit and phase compensating circuit, feedback circuit is located between the inverting input of an end U1+ of transformer T1 secondary side and power amplifier U2, R2 consists of by feedback resistance, transformer T1 secondary side be different from the other end U1-ground connection that is connected with described feedback circuit.The value of arm resistance R1 and feedback resistance R2 is followed formula UOUT=UIN*R2/R1, and for guaranteeing high precision and the stability of output, what two resistance adopted is the precision resister of 1PPM.Low-pass filter circuit is connected between the output terminal and its in-phase input end of power amplifier U2, low-pass filter circuit is made of amplifier U3, resistance R 3 and capacitor C 1, the inverting input of amplifier U3 connects the output terminal of power amplifier U2, its in-phase input end ground connection, its output terminal links to each other with the in-phase input end of power amplifier U2, and described resistance R 3 and capacitor C 1 are connected in parallel on respectively between the inverting input and its output terminal of amplifier U3.Phase compensating circuit is arranged between the output terminal that transformer T1 secondary side connects an end of feedback circuit and power amplifier U2, and phase compensating circuit is made of capacitor C, makes power amplifier U2 can be operated in stable state.
The course of work explanation of above-described embodiment, dsp processor produces a railway digital signal, after data bus outputs to N railway digital isolation change-over circuit synchronously, output amplitude is that 0-7V, frequency are adjustable in the 40-1050HZ scope, precision can reach 0.02% N road small voltage AC signal, and be input to the instrument amplifier U1 of power amplifier module with differential mode, specifically these two signals of output plus terminal and earth terminal of numeral isolation change-over circuit are with the positive and negative mutually input end of differential mode access instrument amplifier U1.Instrument amplifier U1 carries out difference processing to the signal of input, offsets the undesired signal of positive and negative phase input end, makes the waveform distortion of output less.Because instrument amplifier U1 does not have amplification to the signal of signal isolation change-over circuit output, the signal of its output still is the ac small signal of 0-7V, so need further output among the power amplifier U2 it is done the amplification processing, the primary side of the output terminal driving transformer of power amplifier U2 is finally exported by the secondary side of transformer.
One end of the feedback circuit of power amplifier U2 directly is taken on the output terminal of Circuit Fault on Secondary Transformer, is arranged on which position from the hardware principle feedback point, and the value of output just can enough the stablizing in this position.Under normal circumstances, transformer T1 is when transmitting AC signal, and frequency is higher, and amplitude is larger, transformer T1 internal loss is also higher, the easier concussion that causes power amplifier U2, so only under output signal is not very high situation, the output of guarantee high frequency, the process evidence is in the secondary side output 220V of transformer T1, frequency can reach the output of 1050HZ, meets design requirement, so the output limit value of single power amplifier module can be set in 220V.
The amplitude adjusted scope of the voltage by transformer T1 output is 0 ~ 220V, and frequency-tuning range is 40 ~ 1050HZ.Because transformer presents low impedance state for direct current signal, but tuning DC voltage is nearly all lost in the output of all power amplifiers, so here, adopt amplifier U3, resistance R 3 and capacitor C 1 form low-pass filter circuit with the direct current component filtering of power amplifier U2 output, guarantee that the output of transformer T1 is at the state of a linearity.
The key components that circuit of the present invention adopts all is Low Drift Temperature, high-precision device, and what adopt on the hardware is the mode of close loop negative feedback, so can guarantee high precision and the long-time stability of whole circuit.
It is simple and convenient that the present invention operates enforcement, utilizes simple Voltage Series mode, easily realizes high voltage, the output of powerful variable-frequency constant potential source.What the present invention adopted in addition is digital program controlled mode, can control with software programming the output of constant pressure source, realizes the program control output of robotization.Application of the present invention is not limited to this, and Voltage-output that also can the simulating grid primary side is as the checkout equipment of secondary side production producer.
Claims (8)
1. a high-power frequency conversion adjustable constant voltage source is characterized in that, comprises signal generator and N road signal processing circuit, and the power supply of two paths of signals treatment circuit inner member is not altogether arbitrarily;
The described signal processing circuit in every road is made of railway digital isolation change-over circuit and a power amplifier module;
The signal that signal generator produces outputs to each road signal processing circuit synchronously, first after the numeral isolation change-over circuit of each road signal processing circuit is processed, (N is integer to output N, and N 〉=1) the small voltage AC signal of road high precision, isolation, the described small voltage AC signal in each road has identical amplitude, frequency and phase place, and amplitude and the Frequency Synchronization of each road small voltage AC signal are adjustable;
The described small voltage AC signal in each road outputs to finish in the corresponding power amplifier module again and amplify to process, after the output terminal of the described power amplifier module in N road is connected successively as total output of described constant pressure source.
2. high-power frequency conversion adjustable constant voltage according to claim 1 source, it is characterized in that, described power amplifier module comprises instrument amplifier (U1), power amplifier (U2) and transformer (T1), described small voltage AC signal is input to two input ends of described instrument amplifier (U1) with differential mode, output to again the inverting input of power amplifier (U2) by arm resistance R1, the in-phase input end of power amplifier (U2) is by balance resistance R4 ground connection, the output terminal of power amplifier (U2) links to each other with an end of transformer (T1) primary side, the other end ground connection of transformer (T1) primary side, two output terminals of transformer (T1) secondary side are drawn two output terminal (U1+ as this road power amplifier module, U1-) in order to be in series with the output terminal of other power amplifier module;
Described power amplifier module also comprises feedback circuit and low-pass filter circuit, described feedback circuit is located between the inverting input of the end (U1+) of transformer (T1) secondary side and power amplifier (U2), described feedback circuit is made of feedback resistance R2, and described low-pass filter circuit is connected between the output terminal and its in-phase input end of power amplifier (U2).
3. high-power frequency conversion adjustable constant voltage according to claim 2 source, it is characterized in that, also be provided with phase compensating circuit between one end of described transformer (T1) secondary side connection feedback circuit and the output terminal of power amplifier (U2), described phase compensating circuit is made of capacitor C.
4. high-power frequency conversion adjustable constant voltage according to claim 3 source, it is characterized in that, described low-pass filter circuit is made of amplifier (U3), resistance R 3 and capacitor C 1, the inverting input of amplifier (U3) connects the output terminal of power amplifier (U2), its in-phase input end ground connection, its output terminal links to each other with the in-phase input end of power amplifier (U2), and described resistance R 3 and capacitor C 1 are connected in parallel on respectively between the inverting input and its output terminal of amplifier (U3).
5. high-power frequency conversion adjustable constant voltage according to claim 4 source is characterized in that, through the amplitude of the voltage signal of described power amplifier module output below 220V.
6. high-power frequency conversion adjustable constant voltage according to claim 5 source is characterized in that described transformer (T1) secondary side is different from an end (U1-) ground connection that is connected with described feedback circuit.
7. high-power frequency conversion adjustable constant voltage according to claim 6 source is characterized in that described arm resistance R1 and feedback resistance R2 adopt the precision resister of 1PPM.
8. according to claim 1 to 7 each described high-power frequency conversion adjustable constant voltage sources, it is characterized in that, described signal generator is dsp processor, described numeral isolation change-over circuit is formed by connecting in turn by a digital isolator, a digital to analog converter and a prime amplifier (U4) that is provided with the negative-feedback circuit that is made of resistance R, also is provided with on the described dsp processor and is convenient to the RS232 interface that it links to each other with external computer equipment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107819444A (en) * | 2017-10-20 | 2018-03-20 | 昆山龙腾光电有限公司 | Voltage signal amplifying circuit |
| CN109728787A (en) * | 2019-01-29 | 2019-05-07 | 王齐祥 | A kind of power amplifier |
| CN112713777A (en) * | 2021-01-15 | 2021-04-27 | 赣州市正途科技有限公司 | Hydroelectric power supply low-voltage load working circuit |
| TWI785848B (en) * | 2021-10-15 | 2022-12-01 | 中原大學 | High-frequency high-voltage driving device and derivative application system thereof |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. |