CN102104342A - High-precision low-frequency alternating-current power supply device based on sine pulse width modulation (SPWM) - Google Patents
High-precision low-frequency alternating-current power supply device based on sine pulse width modulation (SPWM) Download PDFInfo
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- CN102104342A CN102104342A CN2009102019942A CN200910201994A CN102104342A CN 102104342 A CN102104342 A CN 102104342A CN 2009102019942 A CN2009102019942 A CN 2009102019942A CN 200910201994 A CN200910201994 A CN 200910201994A CN 102104342 A CN102104342 A CN 102104342A
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Abstract
The invention provides a high-precision low-frequency alternating-current power supply device based on sine pulse width modulation (SPWM). The device comprises a power amplifying circuit and a filter circuit, wherein the power amplifying circuit and the filter circuit are coupled through a transformer; an output end of the filter circuit is connected with a control circuit by a detection circuit; an SPWM wave generator is connected with the input end of the transformer by a power driver and a power push-pull type drive circuit in sequence; a reference power supply is connected with a centre tap of the input end of the transformer by an analogue power amplifying circuit; and one control end of the control circuit is connected with the SPWM wave generator, and the other control end of the control circuit is connected with the analogue power amplifying circuit. The device provided by the invention solves the problem that a typical high-precision low-frequency alternating-current voltage-stabilized power source is large in volume, heavy in weight, high in output noise and low in fixed amplitude precision.
Description
Technical field
The present invention relates to a kind of high precision low frequency ac power supply apparatus that adopts sine wave pulse width modulated.
Background technology
Electric weight calibrator in the past adopts fixed ampllitude voltage of low-frequency power amplifier output to give the low frequency power transformer, by amplitude transformation, and the low-frequency ac voltage of a fixed ampllitude of supply load.The shortcoming of this method maximum is exactly the bulky of low frequency power transformer, and Heavy Weight is unfavorable for the electric weight design aligners is become portable instrument.
Along with science and technology development, sine wave pulse width modulated (SPWM) technology is widely used in low-frequency ac voltage output field.Because it adopts high frequency transformer to make output stage, thereby has the advantage that volume is little, in light weight, efficient is high; Simultaneously, owing to adopted high frequency modulated, and therefore carrier wave ratio has the shortcoming that output noise is big, the fixed ampllitude precision is low, as shown in Figure 1 along with load request constantly changes.Be not suitable for being applied to high-precision voltage output occasion.
Cause the low main cause of SPWM output amplitude precision to be: the power tube of modulation output usefulness is operated on off state, promptly when " 0 " during output power tube turn-off output voltage not; The voltage of output equals supply power voltage when " 1 ".General, therefore the precision of supply power voltage has caused the precision of modulator output voltage not high about 1%.Add other reasons such as feedback compensation error, the output accuracy of this class direct voltage source mostly is about 1%.Can not satisfy the amplitude precision requirement of high precision DC power supply＞0.05%.
Therefore, if can improve the amplitude precision of the power supply of SPWM driving stage, then can improve the output accuracy of system.
Summary of the invention
Technical problem to be solved by this invention is: at the problems referred to above, provide the high precision low frequency ac power supply apparatus of the employing sine wave pulse width modulated that a kind of volume is little, in light weight, precision is high.
The present invention is achieved like this:
A kind of high precision low frequency ac power supply apparatus that adopts sine wave pulse width modulated, comprise that the output by transformer-coupled power amplification circuit and filter circuit, described filter circuit links to each other with control circuit by testing circuit, the SPWM wave producer links to each other with the input of described transformer by analog line driver, power push-pull driver circuit successively; Reference power supply links to each other with the centre tap of the input of described transformer by the simulated power amplifying circuit; One control end of described control circuit links to each other with described SPWM wave producer, and another control end links to each other with described simulated power amplifying circuit;
Described simulated power amplifying circuit is used for the signal of telecommunication of described reference power supply output is carried out amplitude adjusting and amplification;
Described control circuit is used for providing a switching signal to described SPWM wave producer, and according to the output voltage on the described testing circuit sensing lead, the error of calculation is regulated the stable signal of telecommunication of output amplitude.
Described simulated power amplifying circuit comprise by and the amplitude regulating circuit that constitutes of the analogue amplifier that connects and digital regulation resistance and the simulated power amplifier that is connected in series with described amplitude regulating circuit; The control end of described digital regulation resistance links to each other with another control end of described control circuit, the output of described simulated power amplifier with link to each other with the centre tap of the input of described transformer.
Described analog line driver is a mosfet driver, and the input of the power MOSFET tube in its output and the described power push-pull driver circuit links to each other, and the output of described power MOSFET tube links to each other with the input of described transformer.
Described filter circuit is the LC low pass filter.
Described transformer is a high-frequency core push-pull type pulse transformer.
The invention has the beneficial effects as follows:
A kind of high precision low frequency ac power supply apparatus that adopts sine wave pulse width modulated of the present invention, adopt a high precision reference power supply chip as voltage reference, through the simulated power amplifying circuit of adjustable amplitude, export a stable DC source, be the power supply of push-pull type pulse transformer; Produce a SPWM ripple by the SPWM generator, manage through high speed mosfet driver driving power MOSFET, insert the input of push-pull type pulse transformer, through push-pull type pulse transformer amplitude transformation, the low-frequency ac voltage of an amplitude stability of filter circuit filtering output.
The simulated power amplifying circuit of adjustable amplitude is supplied with the power drive of an amplitude stability for the push-pull type power amplifier level that is made of analog line driver and power push-pull driver circuit, adopt this method amplitude modulation, can reduce total harmonic distortion effectively so that carrier wave ratio maintains between 0.75～0.85.Carrier wave ratio is meant among the SPWM, the ratio of the peak-to-peak value of the low-frequency sine amplitude that is used to modulate and the peak-to-peak value of carrier wave.The present invention has output accuracy height, little, the lightweight advantage of volume, low-frequency ac stabilized voltage power supply of the present invention, the comparable common switching power supply of the stability of its output voltage improves at least one the order of magnitude, compare with conventional alternating current steady voltage plug as shown in Figure 1, its volume and weight can all reduce more than 50%.Power output is big more, these advantage applies obvious more.Be suitable for the making of portable high-accuracy power calibration.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is typical high precision low frequency alternating current steady voltage plug.
Fig. 2 is for adopting the high precision low frequency alternating current steady voltage plug of SPWM principle.
Fig. 3 is for adopting the high precision low frequency ac regulated power supply principle block diagram of SPWM pattern.
Fig. 4 is the voltage waveform of each node among Fig. 3.
Embodiment
According to Fig. 2, a kind of high precision low frequency ac power supply apparatus that adopts sine wave pulse width modulated, comprise simulated power amplifying circuit and SPWM wave producer by the adjustable amplitude value of control circuit control, the direct voltage that reference power supply produces, through the simulated power amplifying circuit of adjustable amplitude value, insert the centre cap of the input of push-pull type high-frequency pulse transformer T; A SPWM ripple by the generation of SPWM wave producer, through power MOSFET driver, power MOSFET push-pull driver circuit, insert two inputs of push-pull type high-frequency pulse transformer T, through T conversion of push-pull type high-frequency pulse transformer and the filtering of LC low pass filter, export a low-frequency ac voltage that meets load request.If output error is arranged, then testing circuit feeds back to control circuit with the ac voltage signal of output, and the error of calculation is regulated the simulated power amplifying circuit, the signal of telecommunication that output amplitude is stable.
According to Fig. 3, reference power supply produces the reference voltage of an amplitude stability, amplitude regulating circuit that is made of analogue amplifier A1 and digital regulation resistance of feed-in passes through the centre cap that simulated power amplifier A2 inserts push-pull type high-frequency pulse transformer T1 input again.The SPWM wave producer produces a SPWM ripple, be input to power MOSFET driver, driving power MOSFET pipe M1 and M2, insert two inputs of push-pull type high-frequency pulse transformer T1 again, output at push-pull type high-frequency pulse transformer T1 produces a SPWM ripple, produces the low-frequency ac voltage that meets load request through the LC filter that is made of inductance L and capacitor C 2.If output error arranged, then by testing circuit detect, the feed-in control circuit, regulate output voltage through the s operation control digital regulation resistance.
Reference power supply in the foregoing circuit, analogue amplifier, simulated power amplifier, digital regulation resistance, power MOSFET driver, power MOSFET tube are commercially available common chip.Just simulated power amplifier, power MOSFET tube need be selected according to the needs of load, can satisfy getting final product of demanded power output.
Above-mentioned SPWM generator, testing circuit are the circuit common of open source literature record, do not have specific (special) requirements; Control circuit should comprise CPU, analog to digital converter, I/O mouth, is the commercially available prod.
The amplitude of the contained sine wave of general SPWM generator is by sine-wave generator amplitude modulation.If the load request voltage range is wide, then the carrier wave ratio excursion of SPWM will increase.Calculating shows: carrier wave ratio is more little, and then output noise is big more, is unfavorable for exporting the high precision low frequency sine wave.So adopt the amplitude regulating circuit of the SPWM ripple of a high speed analogue amplifier A1 and digital regulation resistance formation.Like this, the carrier wave ratio of SPWM ripple can be fixed on about 0.85, to reduce the THD of output waveform.
According to shown in Figure 4, the SPWM wave producer produces SPWM ripple V1 feed-in power MOSFET driver, produce a pair of positive inversion signal V2, V3, drive a pair of power N type MOSFET pipe, the power DC voltage that is produced by simulated power amplifier A2 inserts the push-pull type high-frequency pulse transformer, because power MOSFET tube M1 and the effect of M2 alternation switch, produce waveform as V4 at the output of push-pull type high-frequency pulse transformer.Pass through the LC filter again, the output low frequency sine wave, its waveform is shown in Vout.Inductance L of using in the LC filter circuit and capacitor C, low frequency rectifying and wave-filtering shown in Figure 1 relatively can be little a lot.
The present invention can produce by using for reference this paper disclosure all combinations and method open and that disclose, although combination of the present invention and method are described by detailed implementation process, but those skilled in the art obviously can be spliced the described method and apparatus of the application in not breaking away from content of the present invention, spirit and scope or change, or increase and decrease some parts, more particularly, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included among spirit of the present invention, scope and the content.
Claims (5)
1. high precision low frequency ac power supply apparatus that adopts sine wave pulse width modulated, comprise that the output by transformer-coupled power amplification circuit and filter circuit, described filter circuit links to each other with control circuit by testing circuit, is characterized in that: the SPWM wave producer links to each other with the input of described transformer by analog line driver, power push-pull driver circuit successively; Reference power supply links to each other with the centre tap of the input of described transformer by the simulated power amplifying circuit; One control end of described control circuit links to each other with described SPWM wave producer, and another control end links to each other with described simulated power amplifying circuit;
Described simulated power amplifying circuit is used for the signal of telecommunication of described reference power supply output is carried out amplitude adjusting and amplification;
Described control circuit is used for providing a switching signal to described SPWM wave producer, and according to the output voltage on the described testing circuit sensing lead, the error of calculation is regulated the stable signal of telecommunication of output amplitude.
2. the high precision low frequency ac power supply apparatus of employing sine wave pulse width modulated according to claim 1 is characterized in that: described simulated power amplifying circuit comprise by and the amplitude regulating circuit that constitutes of the analogue amplifier that connects and digital regulation resistance and the simulated power amplifier that is connected in series with described amplitude regulating circuit; The control end of described digital regulation resistance links to each other with another control end of described control circuit, the output of described simulated power amplifier with link to each other with the centre tap of the input of described transformer.
3. the high precision low frequency ac power supply apparatus of employing sine wave pulse width modulated according to claim 1, it is characterized in that: described analog line driver is a mosfet driver, the input of the power MOSFET tube in its output and the described power push-pull driver circuit links to each other, and the output of described power MOSFET tube links to each other with the input of described transformer.
4. the high precision low frequency ac power supply apparatus of employing sine wave pulse width modulated according to claim 1 is characterized in that: described filter circuit is the LC low pass filter.
5. the high precision low frequency ac power supply apparatus of employing sine wave pulse width modulated according to claim 1 is characterized in that: described transformer is a high-frequency core push-pull type pulse transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102019942A CN102104342A (en) | 2009-12-18 | 2009-12-18 | High-precision low-frequency alternating-current power supply device based on sine pulse width modulation (SPWM) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102019942A CN102104342A (en) | 2009-12-18 | 2009-12-18 | High-precision low-frequency alternating-current power supply device based on sine pulse width modulation (SPWM) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832824A (en) * | 2012-08-07 | 2012-12-19 | 北京金自天正智能控制股份有限公司 | Medium-small power high-precision high-frequency sine wave alternating current power supply |
| CN108693907A (en) * | 2018-05-04 | 2018-10-23 | 兰州智豆信息科技有限公司 | Digital buck alternating current steady voltage plug |
| CN112305281A (en) * | 2020-10-23 | 2021-02-02 | 北京盈拓润达电气科技有限公司 | Fault indicator test system and high-voltage power amplifying circuit thereof |
-
2009
- 2009-12-18 CN CN2009102019942A patent/CN102104342A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832824A (en) * | 2012-08-07 | 2012-12-19 | 北京金自天正智能控制股份有限公司 | Medium-small power high-precision high-frequency sine wave alternating current power supply |
| CN102832824B (en) * | 2012-08-07 | 2014-11-19 | 北京金自天正智能控制股份有限公司 | Medium-small power high-precision high-frequency sine wave alternating current power supply |
| CN108693907A (en) * | 2018-05-04 | 2018-10-23 | 兰州智豆信息科技有限公司 | Digital buck alternating current steady voltage plug |
| CN108693907B (en) * | 2018-05-04 | 2020-05-22 | 兰州智豆信息科技有限公司 | Digital voltage-reducing AC voltage-stabilized source |
| CN112305281A (en) * | 2020-10-23 | 2021-02-02 | 北京盈拓润达电气科技有限公司 | Fault indicator test system and high-voltage power amplifying circuit thereof |
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Application publication date: 20110622 |