CN102955486B - 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 the quality of frequency conversion regulated power supply, function, performance index, intelligent degree and cost.Yet, the power supply product growing up based on Analogical Circuit Technique, performance can not get improving, quality can not be guaranteed, function also can not meet the demand that people use, 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 employing inversion transformation technique at present, alternating current in civil power is converted through AC → DC → AC, adopt the product that this technology obtains can export purer sine wave, and output frequency and voltage adjustable within the specific limits.But adopt the amplitude of variable-frequency electric potential source and the range of adjustment of frequency that this technology obtains to be subject to certain restrictions, major part can only be exported below 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, is just to provide 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;
Described in every road, signal processing circuit consists of a railway digital isolation change-over circuit and a power amplifier module;
The signal that signal generator produces synchronously outputs to each road signal processing circuit, after the numeral isolation change-over circuit of Xian Jingge road signal processing circuit is processed, the small voltage AC signal of output N road high precision, isolation, N is integer, and N >=1, described in each road, small voltage AC signal has identical amplitude, frequency and phase place, and amplitude and the Frequency Synchronization of Qie Ge road small voltage AC signal are adjustable;
Described in each road, small voltage AC signal outputs in corresponding power amplifier module, to complete to amplify again and processes, described in N road the output terminal of power amplifier module connect successively after 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 power supply, carries out separately signal processing separately, and antijamming capability is strong, and precision is high.In addition, the general direct employing civil power of the input of the frequency conversion variable voltage source that available technology adopting inversion transformation technique is made, and civil power is subject to the impact that whole electrical network disturbs, so 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 finally, with series connection formal output, make the output voltage sum that is always 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.
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, by arm resistance R1, output to again the inverting input of power amplifier U2, the in-phase input end of power amplifier U2 is by balance resistance R4 ground connection, the output terminal of power amplifier U2 is connected with one 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 the two output terminal U1+ as this road power amplifier module, U1-is 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 one end U1+ of transformer T1 secondary side and the inverting input of power amplifier U2, described feedback circuit consists 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.
The high pressure of exporting due to constant pressure source of the present invention is that the output voltage by N road power amplifier module is added and 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, transformer internal loss is also higher, more easily causes the concussion of power amplifier, so only the amplitude of guaranteed output signal is not in 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 to carry out difference processing to the small voltage AC signal of input, offset the interference between in-phase input end and inverting input, make the signal distortion of output little, when utilizing power amplifier U2 the little signal of above-mentioned degree of distortion to be amplified to 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 a linear state, the present invention is also arranged on one 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 consists 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 is connected 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.
Between described transformer T1 secondary side connection one end of feedback circuit and the output terminal of power amplifier U2, be also provided with phase compensating circuit, described phase compensating circuit consists of capacitor C, makes the duty of power amplifier U2 more stable.
Described transformer T1 secondary side is different from one end ground connection being connected with described feedback circuit, to strengthen the stability of system.
The amplitude of the voltage signal of exporting through described power amplifier module is below 220V, to can make constant pressure source of the present invention can guarantee the frequency output up to 1050HZ, and output accuracy can reach 0.05%.
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 consisting of resistance R, is also provided with and is convenient to the RS232 interface that it is connected with external computer equipment on described dsp processor.
The present invention utilizes dsp processor to produce the stable digital signal in a road, then this railway digital signal synchronously being outputed to N digital isolator makes to be isolated from each other and not interfere with each other through its output Ge road signal, and utilize the N road circuit with same composition to process respectively described digital signal, not only can well guarantee the precision through the ac voltage signal of power amplifier module output, and make to prepare ac voltage signal described in series connection output Ge road and there is identical frequency, phase place, amplitude, waveform distortion etc., make can superpose completely finally by the high-voltage signal of crossing constant pressure source output.
Relative prior art, the present invention has following beneficial effect: 1) the present invention produces signal by signal generator, synchronously output to N road signal processing circuit, each road signal processing circuit is isolated from each other not altogether, and power supply, carries out separately signal processing separately, 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 and improves output accuracy of the present invention; Constant pressure source of the present invention is with 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 that the voltage of being exported by multichannel power amplifier module stacks up, the requirement of Dui Mei road power amplifier module output voltage amplitude is lowered, to can the output by restriction single channel power amplifier module obtain higher output frequency when guaranteeing precision, make constant pressure source of the present invention export a kind of amplitude and 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 within the scope of 40 ~ 1050HZ, precision can reach 0.05% high power AC voltage signal,
3) the present invention utilizes dsp processor to produce digital signal, the signal that by digital isolator, digital signal is split up into the isolation of N road is again exported, make full use of the feature of dsp processor, make that small voltage AC signal precision by described numeral isolation change-over circuit output is high, frequency-tuning range large, stable be difficult for disturbed; In addition, adopt dsp processor as signal generator, thereby be conveniently connected and realize programmed control with external computer equipment, its output of Lookup protocol, makes described constant pressure source more intelligent.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the schematic diagram (only drawing a 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 object on ground altogether, can not facilitate altogether and finally realize series connection.Every road signal processing circuit consists of a railway digital isolation change-over circuit and a power amplifier module.
The signal that signal generator produces synchronously outputs to each road signal processing circuit, after the numeral isolation change-over circuit of Xian Jingge 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 Qie Ge road small voltage AC signal are adjustable.
As shown in Figure 1, from numeral isolation change-over circuit output Ge road small voltage AC signal, output to again corresponding power amplifier module and complete and amplify processing 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 be connected successively with the output terminal of OUTn+, with this, realize series connection output, total positive output end that the output terminal OUT1+ of finally take is 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 subject to the external factor such as temperature, environment to affect little.As shown in Figure 3, the digital signal that dsp processor produces, by data bus, adopt parallel way to output to respectively in N railway digital isolation change-over circuit, on dsp processor, be provided with and be convenient to the RS232 interface that it is connected 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 consists of a digital isolator, a digital to analog converter and a prime amplifier U4 who is provided with the negative-feedback circuit consisting 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 is to be all transformed by same signal, so the small voltage AC signal of numeral isolation change-over circuit output has identical amplitude, frequency and phase place described in Jing Ge road, amplitude and the Frequency Synchronization of Qie Ge road small voltage AC signal are adjustable.
As shown in Figure 2, power amplifier module comprises instrument amplifier U1, power amplifier U2 and transformer T1 to the structure of the power amplifier module of the present embodiment.Described small voltage AC signal is input to two input ends of described instrument amplifier U1 with differential mode, by arm resistance R1, output to again the inverting input of power amplifier U2, the in-phase input end of power amplifier U2 is by balance resistance R4 ground connection, and the effect of balance resistance is mainly the coupling for the input impedance of guaranteed output amplifier U2 input end.The output terminal of power amplifier U2 is connected with one 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 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 one end U1+ of transformer T1 secondary side and the inverting input of power amplifier U2, by feedback resistance, R2 forms, transformer T1 secondary side be different from the other end U1-ground connection being 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 consists 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 is connected 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 on transformer T1 secondary side and connects between one end of feedback circuit and the output terminal of power amplifier U2, and phase compensating circuit consists 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 synchronously outputs to N railway digital isolation change-over circuit, output amplitude is that 0-7V, frequency are adjustable within the scope of 40-1050HZ, precision can reach 0.02% N road small voltage AC signal, and with differential mode, be input to the instrument amplifier U1 of power amplifier module, specifically the output plus terminal of numeral isolation change-over circuit and these two signals of earth terminal are with the positive and negative phase 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 is still the ac small signal of 0-7V, so need further output in power amplifier U2, it is done and amplifies processing, the primary side of the output terminal driving transformer of power amplifier U2, finally exports by the secondary side of transformer.
One end of the feedback circuit of power amplifier U2 is directly taken on an output terminal of Circuit Fault on Secondary Transformer, from hardware principle feedback point, is arranged on which position, 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, more easily cause the concussion of power amplifier U2, so only in output signal be not very high in the situation that, the output of guarantee high frequency, 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 of exporting by transformer T1 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 by the direct current component filtering of power amplifier U2 output, guarantee that the output of transformer T1 is at a linear state.
The key components that circuit of the present invention adopts is all Low Drift Temperature, high-precision device, and what on hardware, adopt 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 another the present invention adopted is digital program controlled mode, can with software programming, control 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 simulating grid primary side, as the checkout equipment of secondary side production producer.
Claims (7)
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;
Described in every road, signal processing circuit consists of a railway digital isolation change-over circuit and a power amplifier module;
The signal that signal generator produces synchronously outputs to each road signal processing circuit, after the numeral isolation change-over circuit of Xian Jingge 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, described in each road, small voltage AC signal has identical amplitude, frequency and phase place, and amplitude and the Frequency Synchronization of Qie Ge road small voltage AC signal are adjustable;
Described in each road, small voltage AC signal outputs in corresponding power amplifier module, to complete to amplify again and processes, described in N road the output terminal of power amplifier module connect successively after as total output of described constant pressure source;
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, by arm resistance R1, output to again the inverting input of power amplifier (U2), the in-phase input end of power amplifier (U2) is by balance resistance R4 ground connection, the output terminal of power amplifier (U2) is connected with one 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 the two output terminal (U1+ as this road power amplifier module, U1-) 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 one end (U1+) of transformer (T1) secondary side and the inverting input of power amplifier (U2), described feedback circuit consists 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).
2. high-power frequency conversion adjustable constant voltage according to claim 1 source, it is characterized in that, between described transformer (T1) secondary side connection one end of feedback circuit and the output terminal of power amplifier (U2), be also provided with phase compensating circuit, described phase compensating circuit consists of capacitor C.
3. high-power frequency conversion adjustable constant voltage according to claim 2 source, it is characterized in that, described low-pass filter circuit consists 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 is connected 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).
4. high-power frequency conversion adjustable constant voltage according to claim 3 source, is characterized in that, the amplitude of the voltage signal of exporting through described power amplifier module is below 220V.
5. high-power frequency conversion adjustable constant voltage according to claim 4 source, is characterized in that, described transformer (T1) secondary side is different from one end (U1-) ground connection being connected with described feedback circuit.
6. high-power frequency conversion adjustable constant voltage according to claim 5 source, is characterized in that, described arm resistance R1 and feedback resistance R2 adopt the precision resister of 1PPM.
7. according to the high-power frequency conversion adjustable constant voltage source described in claim 1 to 6 any one, 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 consisting of resistance R, is also provided with and is convenient to the RS232 interface that it is connected with external computer equipment on described dsp processor.
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| CN107819444B (en) * | 2017-10-20 | 2021-06-22 | 昆山龙腾光电股份有限公司 | Voltage signal amplifying circuit |
| CN109728787A (en) * | 2019-01-29 | 2019-05-07 | 王齐祥 | A kind of power amplifier |
| CN112713777B (en) * | 2021-01-15 | 2022-09-16 | 国网上海市电力公司 | 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2212208Y (en) * | 1994-06-24 | 1995-11-08 | 郑本荣 | Computer controlled relay protective detector |
| CN101063889A (en) * | 2006-04-24 | 2007-10-31 | 李永高 | Electronic type constant current stabilizer |
| CN101876834A (en) * | 2010-06-23 | 2010-11-03 | 中兴通讯股份有限公司 | Tracking power supply device and control method thereof |
| CN201910863U (en) * | 2010-12-17 | 2011-07-27 | 三维通信股份有限公司 | Multi-channel radio-frequency phase matching control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7230473B2 (en) * | 2005-03-21 | 2007-06-12 | Texas Instruments Incorporated | Precise and process-invariant bandgap reference circuit and method |
-
2012
- 2012-10-24 CN CN201210408066.5A patent/CN102955486B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2212208Y (en) * | 1994-06-24 | 1995-11-08 | 郑本荣 | Computer controlled relay protective detector |
| CN101063889A (en) * | 2006-04-24 | 2007-10-31 | 李永高 | Electronic type constant current stabilizer |
| CN101876834A (en) * | 2010-06-23 | 2010-11-03 | 中兴通讯股份有限公司 | Tracking power supply device and control method thereof |
| CN201910863U (en) * | 2010-12-17 | 2011-07-27 | 三维通信股份有限公司 | Multi-channel radio-frequency phase matching control device |
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