CN204242013U - A kind of program control single-phase alternating current source apparatus - Google Patents
A kind of program control single-phase alternating current source apparatus Download PDFInfo
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- CN204242013U CN204242013U CN201420775651.3U CN201420775651U CN204242013U CN 204242013 U CN204242013 U CN 204242013U CN 201420775651 U CN201420775651 U CN 201420775651U CN 204242013 U CN204242013 U CN 204242013U
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Abstract
The utility model provides a kind of program control single-phase alternating current source apparatus, comprises crystal oscillator, SPWM signal generator, full-bridge driver, full-bridge converter, separate AC/DC transducer, LC low-pass filter, lifting/voltage reducing autotransformer, feedback circuit, digital analog converter and error amplifier.The program control single-phase alternating current source apparatus that the utility model provides, its whole single phase alternating current power supply device volume is little, output waveform degree of distortion low (total harmonic distortion rate≤1%), operating frequency range wide (40Hz ~ 500Hz), operating voltage range wide (5V ~ 300V), and can to frequency of operation and voltage-programmed, frequency of operation resolution up to 0.1Hz, precision higher than ± 0.002%, degree of stability is higher than 10
-5, operating voltage resolution up to 0.1V, precision higher than 0.5%, degree of stability higher than 0.5%, be the optimal selection of user in program control single-phase alternating current source apparatus field.
Description
Technical field
The utility model belongs to AC power field, is specifically related to a kind of program control single-phase alternating current source apparatus.
Background technology
Only have single alternating voltage in circuit, the electric current produced in circuit and voltage all change in time with certain frequency.Such as in the generator of single coil, (namely only have a coil to rotate in magnetic field), in coil, only produce an alternating electromotive force, such alternating current is single-phase alternating current.
Inventor of the present utility model finds through research, needs to use that degree of distortion is low, the program-controlled single phase alternating current power supply of frequency and voltage at present in the occasion such as maintenance of equipment, calibrating indicating instrument.But the single phase alternating current power supply that it is possible to select for user is few, bring inconvenience thus to the relevant use of user.
Utility model content
The single phase alternating current power supply can selected for user existed for prior art is few, and bring the technical matters of inconvenience thus to the relevant use of user, the utility model provides a kind of program control single-phase alternating current source apparatus.
To achieve these goals, the utility model adopts following technical scheme:
A kind of program control single-phase alternating current source apparatus, comprises crystal oscillator, SPWM signal generator, full-bridge driver, full-bridge converter, separate AC/DC transducer, LC low-pass filter, lifting/voltage reducing autotransformer, feedback circuit, digital analog converter and error amplifier, described crystal oscillator produces the clock signal VCLK needed for SPWM signal generator, described SPWM signal generator provides the unipolarity frequency multiplication SPWM signal SPWM1 with Dead Time, described full-bridge driver exports and is applicable to full-bridge converter height side and the SPWM pumping signal SPWM2 needed for low side under the control of SPWM1, high voltage direct current VDC is transformed to SPWM power signal VO1 by described full-bridge converter under the control of SPWM2, electric main VI is transformed to fixing high voltage direct current VDC by described separate AC/DC transducer, carrier signal in SPWM power signal VO1 leaches by described LC low-pass filter, obtain sine wave signal VO2, described lifting/voltage reducing autotransformer carry out boosting or step-down to expand the rangeability of VO2, complete machine output voltage amplitude scope is made to meet preset requirement, described feedback circuit process complete machine output voltage VO, obtain the feedback voltage V B arranged with the amplitude proportional of complete machine output voltage VO, sinusoidal amplitude signalization DV is converted to the reference voltage VR of simulation by described digital analog converter, described error amplifier amplifies the difference of reference voltage VR and feedback voltage V B, sine wave output amplitude control voltage VOAD.
The program control single-phase alternating current source apparatus that the utility model provides, its whole single phase alternating current power supply device volume is little, output waveform degree of distortion low (total harmonic distortion rate≤1%), operating frequency range wide (40Hz ~ 500Hz), operating voltage range wide (5V ~ 300V), and can to frequency of operation and voltage-programmed, frequency of operation resolution up to 0.1Hz, precision higher than ± 0.002%, degree of stability is higher than 10
-5, operating voltage resolution up to 0.1V, precision higher than 0.5%, degree of stability higher than 0.5%, be the optimal selection of user in program control single-phase alternating current source apparatus field.
Further, described SPWM signal generator comprises input end, output terminal, sine wave freuqency arrange end, sinusoidal amplitude control end and sine wave freuqency signal output part, described input end is connected with crystal oscillator, described output terminal is connected with full-bridge driver, described sine wave freuqency arranges end and arranges sinusoidal wave frequency, described sinusoidal amplitude control end controls sinusoidal wave amplitude, described sine wave freuqency signal output part sine wave output frequency signal.
Further, described feedback circuit comprises attenuation network, both-end/single-end conversion circuit, accurate full-wave rectifying circuit, variable cutoff frequency low-pass filter and Phase Locked Loop Frequency Doubler, described attenuation network is decayed to complete machine output voltage, the amplitude of the sinusoidal voltage VOA after decay is made to meet the requirement of subsequent process circuit, VOA double-end signal is transformed to single-ended signal VODS by described both-end/single-end conversion circuit, signal VODS is transformed to full wave rectified signal VOAE by described accurate full-wave rectifying circuit, described variable cutoff frequency low-pass filter carries out filtering to signal VOAE, to obtain average weight in VOAE, described Phase Locked Loop Frequency Doubler is certain subharmonic of sine wave freuqency VF that SPWM signal generator exports for making the frequency of low-pass filter oscillating voltage VOSC, ensure that the cutoff frequency of switching capacity low-pass filter changes with the change of complete machine output frequency.
Further, described variable cutoff frequency low-pass filter selects multistage switching capacity low-pass filter.
Accompanying drawing explanation
Fig. 1 is the program control single phase alternating current power supply complete machine theory of constitution schematic diagram that the utility model provides.
Fig. 2 is feedback circuit theory of constitution schematic diagram in Fig. 1.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the utility model further.
Please refer to shown in Fig. 1, the utility model provides a kind of program control single-phase alternating current source apparatus, comprises crystal oscillator, SPWM signal generator, full-bridge driver, full-bridge converter, separate AC/DC transducer, LC low-pass filter, lifting/voltage reducing autotransformer (namely rising (falling) pressure autotransformer), feedback circuit, digital analog converter (i.e. DAC) and error amplifier, described crystal oscillator produces the clock signal VCLK needed for SPWM signal generator, described SPWM signal generator provides the unipolarity frequency multiplication SPWM signal SPWM1 with Dead Time, described full-bridge driver exports and is applicable to full-bridge converter height side and the SPWM pumping signal SPWM2 needed for low side under the control of SPWM1, high voltage direct current VDC is transformed to SPWM power signal VO1 by described full-bridge converter under the control of SPWM2, electric main VI is transformed to fixing high voltage direct current VDC by described separate AC/DC transducer, carrier signal in SPWM power signal VO1 leaches by described LC low-pass filter, obtain sine wave signal VO2, described lifting/voltage reducing autotransformer carry out boosting or step-down to expand the rangeability of VO2, complete machine output voltage amplitude scope is made to meet preset requirement, described feedback circuit process complete machine output voltage VO, obtain the feedback voltage V B arranged with the amplitude proportional of complete machine output voltage VO, sinusoidal amplitude signalization DV is converted to the reference voltage VR of simulation by described digital analog converter, described error amplifier amplifies the difference of reference voltage VR and feedback voltage V B, sine wave output amplitude control voltage VOAD.
The program control single-phase alternating current source apparatus that the utility model provides, its whole single phase alternating current power supply device volume is little, output waveform degree of distortion low (total harmonic distortion rate≤1%), operating frequency range wide (40Hz ~ 500Hz), operating voltage range wide (5V ~ 300V), and can to frequency of operation and voltage-programmed, frequency of operation resolution up to 0.1Hz, precision higher than ± 0.002%, degree of stability is higher than 10
-5, operating voltage resolution up to 0.1V, precision higher than 0.5%, degree of stability higher than 0.5%, be the optimal selection of user in program control single-phase alternating current source apparatus field.
Particularly, please refer to shown in Fig. 1, in the program control single-phase alternating current source apparatus that the utility model provides, described crystal oscillator is for generation of the clock signal VCLK needed for SPWM signal generator, the frequency accuracy of clock signal VCLK and frequency stability determine frequency accuracy and the frequency stability of complete machine output signal, and clock signal VCLK is logic level signal.
Described SPWM signal generator is for providing the SPWM1 of the unipolarity frequency multiplication SPWM signal with Dead Time, and SPWM1 is formed by natural sampling by sinewave modulation signal and triangular wave carrier signal, as a kind of embodiment, described SPWM signal generator comprises input end, output terminal, sine wave freuqency arranges end, sinusoidal amplitude control end and sine wave freuqency signal output part, described input end is connected with crystal oscillator, described output terminal is connected with full-bridge driver, the signalization DF that sinusoidal wave frequency arranges end by described sine wave freuqency is arranged, DF is digital signal, produced by external switch circuit, the frequency of complete machine output signal equals sine wave freuqency, by changing the value of sine wave freuqency signalization DF, the frequency that complete machine can be made to output signal changes in scope of design, sinusoidal wave amplitude is controlled by the control signal VOAD of sinusoidal amplitude control end, VOAD is DC voltage, VOAD is larger, and sinusoidal amplitude is larger, and the amplitude of complete machine output signal is relevant with sinusoidal amplitude, and the amplitude of sinusoidal amplitude larger complete machine output signal is larger, SPWM signal generator is sine wave output frequency signal VF also, and VF is logic level signal.
Described full-bridge driver is for exporting the SPWM pumping signal SPWM2 needed for applicable full-bridge converter height side and low side.
Described full-bridge converter is used under the control of SPWM pumping signal SPWM2, high voltage direct current VDC is transformed to SPWM power signal VO1.
Described separate AC/DC transducer is used for electric main VI to be transformed to fixing high voltage direct current VDC, and separate AC/DC transducer has PFC function, can reduce the interference of complete machine to utility grid, and can improve the Electro Magnetic Compatibility of complete machine; The AC of separate AC/DC transducer and DC side are through electric isolution, ensure complete machine output signal and city's electric signal electric isolution, therefore, the transformer used for expanding amplitude output signal scope just can use non-isolated autotransformer, effectively can reduce the design power of transformer, thus ensure that complete machine has less volume and lighter weight.
Described LC low-pass filter is used for the carrier signal in SPWM power signal VO1 to leach, and obtains sine wave signal VO2.
Described liter (falling) pressure autotransformer: because high voltage direct current VDC is fixed voltage, although sine wave signal VO2 can be changed within the specific limits by changing sinusoidal amplitude control signal VOAD, but still the requirement of complete machine output voltage amplitude wide region can not be met, by liter boosting of (falling) pressure autotransformer or a hypotensive effect, the rangeability of expansion VO2, makes complete machine output voltage amplitude scope meet design requirement.
Described feedback circuit is for the treatment of complete machine output voltage VO, obtain the feedback voltage V B arranged with the amplitude proportional of complete machine output voltage VO, feedback circuit obtains VB by the mean value measuring VO absolute value, uses the method that system can be made to have the ability of stronger anti-instantaneous disturbance.Please refer to shown in Fig. 2, as a kind of embodiment, described feedback circuit comprises attenuation network, both-end/single-end conversion circuit, accurate full-wave rectifying circuit, variable cutoff frequency low-pass filter and Phase Locked Loop Frequency Doubler; Wherein, described attenuation network arranges damping capacity according to the amplitude of complete machine output voltage, decays to complete machine output voltage, makes the amplitude of the sinusoidal voltage VOA after decay meet the requirement of subsequent process circuit; Because VOA is double-end signal, for meeting subsequent conditioning circuit processing requirements, after described both-end/single-end conversion circuit, VOA double-end signal is transformed to single-ended signal VODS; VODS is sine wave signal, after described accurate full-wave rectifying circuit, signal VODS is transformed to full wave rectified signal VOAE, the amplitude proportional example relation of the average weight in VOAE and complete machine output voltage VO; Described variable cutoff frequency low-pass filter carries out filtering to signal VOAE, to obtain average weight in VOAE, namely in order to obtain the average weight in VOAE, low-pass filter need be used VOAE filtering, the selection of low pass filter cutoff frequency is most important: cutoff frequency is selected too high, and the system transients response time is fast, but is unfavorable for the low-limit frequency signal that filtering complete machine exports, make containing AC compounent in VB, the AC compounent in VB can cause the precision that arranges of complete machine output voltage amplitude to reduce; Cutoff frequency is selected too low, although be beneficial to the low-limit frequency signal of filtering complete machine output, that improves complete machine output voltage amplitude arranges precision, and the system transients response time is slow, and system becomes unstable.Thus in order to reach can filtering complete machine export low-limit frequency, the stability of system can not be reduced again, just need use attenuation characteristic change precipitous low-pass filter, the utility model uses multistage switching capacity low-pass filter to meet this requirement; But switching capacity low-pass filter exists decaying wave in passband to be moved, when the frequency that complete machine exports is in this decay fluctuation point, system becomes unstable, if can ensure, the cutoff frequency of switching capacity low-pass filter changes with the change of complete machine output frequency, just can avoid the point that fluctuates, when ensureing that complete machine exports all frequencies, system is stable, and the cutoff frequency of switching capacity low-pass filter becomes fixed proportion relation with the frequency of its oscillating voltage VOSC; Described Phase Locked Loop Frequency Doubler is certain subharmonic of sine wave freuqency VF that SPWM signal generator exports for making the frequency of low-pass filter oscillating voltage VOSC, ensures that the cutoff frequency of switching capacity low-pass filter changes with the change of complete machine output frequency.
Described digital analog converter and DAC are used for reference voltage VR sinusoidal amplitude signalization DV being converted to simulation; Wherein, DV is sinusoidal amplitude signalization, is digital signal, can be provided by external switch circuit.
Described error amplifier for amplifying the difference of reference voltage VR and feedback voltage V B, sine wave output amplitude control voltage VOAD.
In the program control single-phase alternating current source apparatus that the utility model provides, its complete machine output voltage stabilization principle is: when complete machine output voltage VO diminishes (as loaded impedance reduces) because of certain reason, the feedback voltage V B obtained by feedback circuit is also diminished; Reference voltage VR is determined by sinusoidal amplitude signalization DV, thus remains unchanged.When feedback voltage V B diminishes, the sinusoidal amplitude control voltage VOAD that error amplifier exports becomes large, sinusoidal amplitude control voltage VOAD becomes makes again greatly complete machine output voltage VO become large, result complete machine output voltage VO substantially constant (amplitude that VO reduces is in the scope of index request).
Meanwhile, its complete machine output voltage setting principle is: arrange sinusoidal amplitude signalization DV by external switch circuit, after DAC conversion, obtains required reference voltage VR.Because the gain of error amplifier is very high, feedback voltage V B and reference voltage VR approximately equal, and feedback voltage V B is directly proportional to complete machine output voltage VO and arranges, so arrange reference voltage VR can arrange complete machine output voltage VO.
These are only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure utilizing the utility model instructions and accompanying drawing content to do; directly or indirectly be used in the technical field that other are relevant, all in like manner within scope of patent protection of the present utility model.
Claims (4)
1. a program control single-phase alternating current source apparatus, it is characterized in that, comprise crystal oscillator, SPWM signal generator, full-bridge driver, full-bridge converter, separate AC/DC transducer, LC low-pass filter, lifting/voltage reducing autotransformer, feedback circuit, digital analog converter and error amplifier, described crystal oscillator produces the clock signal VCLK needed for SPWM signal generator, described SPWM signal generator provides the unipolarity frequency multiplication SPWM signal SPWM1 with Dead Time, described full-bridge driver exports and is applicable to full-bridge converter height side and the SPWM pumping signal SPWM2 needed for low side under the control of SPWM1, high voltage direct current VDC is transformed to SPWM power signal VO1 by described full-bridge converter under the control of SPWM2, electric main VI is transformed to fixing high voltage direct current VDC by described separate AC/DC transducer, carrier signal in SPWM power signal VO1 leaches by described LC low-pass filter, obtain sine wave signal VO2, described lifting/voltage reducing autotransformer carry out boosting or step-down to expand the rangeability of VO2, complete machine output voltage amplitude scope is made to meet preset requirement, described feedback circuit process complete machine output voltage VO, obtain the feedback voltage V B arranged with the amplitude proportional of complete machine output voltage VO, sinusoidal amplitude signalization DV is converted to the reference voltage VR of simulation by described digital analog converter, described error amplifier amplifies the difference of reference voltage VR and feedback voltage V B, sine wave output amplitude control voltage VOAD.
2. program control single-phase alternating current source apparatus according to claim 1, it is characterized in that, described SPWM signal generator comprises input end, output terminal, sine wave freuqency arrange end, sinusoidal amplitude control end and sine wave freuqency signal output part, described input end is connected with crystal oscillator, described output terminal is connected with full-bridge driver, described sine wave freuqency arranges end and arranges sinusoidal wave frequency, described sinusoidal amplitude control end controls sinusoidal wave amplitude, described sine wave freuqency signal output part sine wave output frequency signal.
3. program control single-phase alternating current source apparatus according to claim 1, is characterized in that, described feedback circuit comprises attenuation network, both-end/single-end conversion circuit, accurate full-wave rectifying circuit, variable cutoff frequency low-pass filter and Phase Locked Loop Frequency Doubler, described attenuation network is decayed to complete machine output voltage, the amplitude of the sinusoidal voltage VOA after decay is made to meet the requirement of subsequent process circuit, VOA double-end signal is transformed to single-ended signal VODS by described both-end/single-end conversion circuit, signal VODS is transformed to full wave rectified signal VOAE by described accurate full-wave rectifying circuit, described variable cutoff frequency low-pass filter carries out filtering to signal VOAE, to obtain average weight in VOAE, described Phase Locked Loop Frequency Doubler is certain subharmonic of sine wave freuqency VF that SPWM signal generator exports for making the frequency of low-pass filter oscillating voltage VOSC, ensure that the cutoff frequency of switching capacity low-pass filter changes with the change of complete machine output frequency.
4. program control single-phase alternating current source apparatus according to claim 3, is characterized in that, described variable cutoff frequency low-pass filter selects multistage switching capacity low-pass filter.
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| CN201420775651.3U CN204242013U (en) | 2014-12-10 | 2014-12-10 | A kind of program control single-phase alternating current source apparatus |
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| CN201420775651.3U CN204242013U (en) | 2014-12-10 | 2014-12-10 | A kind of program control single-phase alternating current source apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104865998A (en) * | 2014-12-10 | 2015-08-26 | 重庆希诺达通信有限公司 | Programmable control single-phase alternating current power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104865998A (en) * | 2014-12-10 | 2015-08-26 | 重庆希诺达通信有限公司 | Programmable control single-phase alternating current power supply device |
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