CN103354423A - Variable frequency power supply used for iron-core magnetic property testing - Google Patents
Variable frequency power supply used for iron-core magnetic property testing Download PDFInfo
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- CN103354423A CN103354423A CN2013102424085A CN201310242408A CN103354423A CN 103354423 A CN103354423 A CN 103354423A CN 2013102424085 A CN2013102424085 A CN 2013102424085A CN 201310242408 A CN201310242408 A CN 201310242408A CN 103354423 A CN103354423 A CN 103354423A
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Abstract
The invention discloses a variable frequency power supply used for iron-core magnetic property testing. The variable frequency power supply comprises a rectification circuit, a chopper circuit, an inversion circuit and a load iron core. An alternating current power supply passes through an isolator and then is connected to an input terminal of the rectification circuit. An output terminal of the rectification circuit passes through a direct current filter and then is connected to the input terminal of the chopper circuit. The output terminal of the chopper circuit is connected to the input terminal of the inversion circuit. The output terminal of the inversion circuit passes through an alternating current filter and then is connected to the input terminal of a test iron core. The chopper circuit is a Buck Chopper voltage reduction chopper circuit. The inversion circuit is a PWM inversion circuit. The variable frequency power supply possesses power supply output essentially without harmonic wave. A constant voltage and constant current mode is possessed. An on load capability is strong. Power supply waveform output is controllable. A power supply correlation data processing algorithm is simple. Operation is convenient. Measurement result precision is high. The variable frequency power supply has many other advantages.
Description
Technical field
The present invention relates to electric and the electrical engineering technical field, specifically is a kind of variable frequency power supply that can test for core magnetism performance.
Background technology
The design of estimated current instrument transformer, use all be empirical data.Greatly affected the actual design effect of core design and shielding design.Have two large problems when the design iron core, one is to have the larger problem of the linear allowance of iron core, and another is to have nargin not even the problem of linear segment performance deficiency.Bring hidden danger also for simultaneously the safe and stable operation of instrument transformer.For adapting to the under the new situation new demand of instrument transformer designs, obtain more accurately the iron core actual measurement data, design economical and practical, and the satisfactory iron core of performance parameter, need exploitation core magnetism performance energy tester, obtain the actual magnetizing parameters of iron core, obtain the iron core magnetization data of correct practicality for core design.In the iron core test process, need power supply that the excitation winding of iron core is carried out excitation, set up and measure magnetic flux, traditional magnetic can testing equipment use traditional mechanical voltage regulator to the iron core excitation, this kind field power supply exists the power supply wave shape harmonic content larger, and carrying load ability is not enough, and is higher to measuring instrument filtering, data processing requirements, the defectives such as algorithm is complicated, and measuring result error is larger.
Summary of the invention
The purpose of this invention is to provide a kind of variable frequency power supply that can test for core magnetism performance, be used to provide frequency, measuring-signal that voltage is adjustable, the core component of measuring for the multiple frequency conversion of the device such as Industry Control, electric power system, electric measurement and various electromechanical integration, be specially adapted to for keep core magnetism performance can test in the waveform of magnetic field intensity be that the magnetic property of sine-shaped different iron cores is tested.
Technical scheme of the present invention is as follows: a kind of variable frequency power supply that can test for core magnetism performance comprises rectification circuit, chopper circuit, inverter circuit and load iron core; AC power is connected to the input of rectification circuit after by isolator, the output of rectification circuit is through being connected to the input of chopper circuit after the DC filter, the output of chopper circuit is connected to the input of inverter circuit, and the output of inverter circuit is through being connected to the input of test iron core behind the alternating current filter; Described chopper circuit is Buck Chopper buck circuit, and described inverter circuit is the PWM inverter circuit.
Buck Chopper buck circuit comprises main circuit and control circuit, and wherein control circuit comprises voltage comparator, ratio-integral PI controller, triangular carrier generator and PWM modulator; The negative input end of voltage comparator is connected to the output of described Buck Chopper buck circuit, the positive input terminal of voltage comparator is connected to the input of described test iron core, the output passing ratio of voltage comparator-integral PI controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.
The PWM inverter circuit comprises main circuit and control circuit, and wherein control circuit comprises integrator, inverter, voltage comparator, proportional-integral-differential PID controller, triangular carrier generator and PWM modulator; The input of integrator is connected to the output of described test iron core, the output of integrator is connected to the positive input terminal of voltage comparator by inverter, the negative input end of voltage comparator is connected to the input of described test iron core, output passing ratio-the integration of voltage comparator-differential PID controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.
The technique effect that the present invention obtains is, the variable frequency power supply that can test for core magnetism performance has power supply output substantially without harmonic wave, have constant voltage, constant current mode, carrying load ability is strong, power supply wave shape output is controlled, power supply Correlation method for data processing algorithm is simple, and is easy to operate, and the measurement result precision is than advantages of higher.
Description of drawings
Fig. 1 is system construction drawing of the present invention.
Fig. 2 is Buck Chopper buck circuit control modulation ratio schematic diagram.
Fig. 3 is PWM inverter circuit output valve PID closed-loop control system figure.
Fig. 4 is circuit diagram of the present invention.
Embodiment
As shown in Figure 4, a kind of variable frequency power supply that can test for core magnetism performance comprises rectification circuit, chopper circuit, inverter circuit and load iron core; AC power is connected to the input of rectification circuit after by isolator, be connected to the input of Buck Chopper buck circuit behind the output process DC filter C1 of rectification circuit, the output of Buck Chopper buck circuit is connected to PWM(Pulse Width Modulation) input of inverter circuit, be connected to the input of test iron core behind the alternating current filter that the output of PWM inverter circuit consists of through L2, C3.Rectification circuit adopts the uncontrollable rectifier bridge of diode.
Buck Chopper buck circuit comprises main circuit and control circuit, and wherein main circuit is based on insulated gate bipolar transistor IGBT, and L1, C2 consist of filter; Control circuit comprises voltage comparator, ratio-integral PI controller, triangular carrier generator and PWM modulator; The negative input end of voltage comparator is connected to the output of described BuckChopper buck circuit, the positive input terminal of voltage comparator is connected to the input of described test iron core, the output passing ratio of voltage comparator-integral PI controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.Control circuit is made of on-site programmable gate array FPGA.
The PWM inverter circuit comprises main circuit and control circuit, and main circuit also is based on insulated gate bipolar transistor IGBT, and control circuit comprises integrator, inverter, voltage comparator, proportional-integral-differential PID controller, triangular carrier generator and PWM modulator; The input of integrator is connected to the output of described test iron core, the output of integrator is connected to the positive input terminal of voltage comparator by inverter, the negative input end of voltage comparator is connected to the input of described test iron core, output passing ratio-the integration of voltage comparator-differential PID controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.Control circuit is made of on-site programmable gate array FPGA equally.
Because the coil of test iron core is resistance sense, for fear of the resonance that LC filtering causes, series connection power resistor R in filter capacitor C3.
For inverter circuit, contained two indexs of harmonic content in comprehensive raising direct voltage utilance and the minimizing output waveform, and when considering the inverter circuit control precision, to cross when low degree of regulation inadequate when modulation ratio, nargin was inadequate when modulation ratio was too high, therefore PWM inverter circuit modulation ratio was set about 0.8.Adjusting to the controllable electric power output voltage in electric power main circuit generally has the direct pressure regulation of pair output AC voltage and Converting Unit input vertical compression is regulated two kinds of methods, the method that this circuit adopts straightening to press, so only need just can regulate inverter circuit input vertical compression by the break-make of insulated gate bipolar transistor IGBT pipe in closed loop proportional-integral PI controlled hypotension chopper circuit, control is convenient.
For guaranteeing to adopt PWM inverter circuit modulation ratio to be controlled at about 0.8, the variation of the output voltage of inverter circuit will cause the variation of its input direct voltage, i.e. the output voltage U of buck circuit
d, with its with
After send into ratio-integral PI controller, again through producing conducting and the cut-off signals of control switch pipe behind the PWM modulator, make output voltage follow reference voltage, thereby guaranteed that PWM inverter circuit modulation ratio is controlled at about 0.8, the inverter circuit control precision is improved.Fig. 2 is Buck Chopper buck circuit control modulation ratio schematic diagram.Wherein, G
VdBe the transfer function of duty ratio to output, wherein, U
dBe the output voltage of buck circuit, U
oBe the filtered output voltage of PWM inverter circuit.
Be sinusoid for keeping the magnetic induction density B waveform, guarantee that namely secondary induction voltage is sinusoid, adopt the secondary induction voltage integrating meter is obtained the method that the signal voltage of magnetic induction density B feeds back.Concrete grammar is as follows: the secondary induction voltage U that gathers iron core
2fOutput voltage U with the PWM inverter circuit
o, with U
oWith U
2fAfter comparing, be sent in the proportional-integral-differential PID controller, its output signal sent in the modulation circuit again, obtain switching signal, the break-make by switching signal control insulated gate bipolar transistor IGBT realizes voltage-tracing.Fig. 3 is PWM inverter circuit output valve PID closed-loop control system figure.Wherein, K
PwmBe the transfer function of modulator input signal to inverter output voltage, G
VdTransfer function during expression LRC filter bringing onto load iron core.U
RefBe the given voltage of PWM inverter circuit, U
2fSecondary induction voltage for iron core.
Use sampling method when measuring AC Hysteresis Loop, first exciting voltage is added to predetermined numerical value, read corresponding magnetizing current and the induced voltage of secondary coil, change exciting voltage, just can obtain a series of magnetizing current and corresponding secondary coil induced voltage, so just can obtain a volt-ampere characteristic.Then can obtain magnetic field intensity in the iron core according to Ampere circuit law
Can obtain magnetic flux density in the iron core according to the law of electromagnetic induction
So just can be converted to ac magnetization curve.Ac magnetization curve is the summit (H of an AC Hysteresis Loop
m, B
m) track, thereby AC Hysteresis Loop has also just obtained.
Claims (7)
1. one kind is used for the variable frequency power supply that core magnetism performance can be tested, and comprises rectification circuit, chopper circuit, inverter circuit and load iron core; AC power is connected to the input of rectification circuit after by isolator, the output of rectification circuit is through being connected to the input of chopper circuit after the DC filter, the output of chopper circuit is connected to the input of inverter circuit, and the output of inverter circuit is through being connected to the input of test iron core behind the alternating current filter; It is characterized in that, described chopper circuit is Buck Chopper buck circuit, and described inverter circuit is the PWM inverter circuit.
2. variable frequency power supply as claimed in claim 1, it is characterized in that, described Buck Chopper buck circuit comprises main circuit and control circuit, and wherein control circuit comprises voltage comparator, ratio-integral PI controller, triangular carrier generator and PWM modulator; The negative input end of voltage comparator is connected to the output of described Buck Chopper buck circuit, the positive input terminal of voltage comparator is connected to the input of described test iron core, the output passing ratio of voltage comparator-integral PI controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.
3. variable frequency power supply as claimed in claim 2 is characterized in that, the main circuit of described Buck Chopper buck circuit is based on insulated gate bipolar transistor IGBT, and control circuit is made of on-site programmable gate array FPGA.
4. variable frequency power supply as claimed in claim 1, it is characterized in that, described PWM inverter circuit comprises main circuit and control circuit, and wherein control circuit comprises integrator, inverter, voltage comparator, proportional-integral-differential PID controller, triangular carrier generator and PWM modulator; The input of integrator is connected to the output of described test iron core, the output of integrator is connected to the positive input terminal of voltage comparator by inverter, the negative input end of voltage comparator is connected to the input of described test iron core, output passing ratio-the integration of voltage comparator-differential PID controller is connected to the first input end of PWM modulator, the output of triangular carrier generator is connected to the second input of PWM modulator, and the output of PWM modulator is connected to the control end of described main circuit.
5. variable frequency power supply as claimed in claim 4 is characterized in that, the main circuit of described PWM inverter circuit is based on insulated gate bipolar transistor IGBT, and control circuit is made of on-site programmable gate array FPGA.
6. variable frequency power supply as claimed in claim 1 is characterized in that, described DC filter is capacitive filter, and alternating current filter is LC filter and filter capacitor C series connection power resistor R.
7. variable frequency power supply as claimed in claim 1 is characterized in that, described rectification circuit is the uncontrollable rectifier bridge of diode.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360294A (en) * | 2014-11-20 | 2015-02-18 | 保定天威集团有限公司 | Method and platform for testing magnetic performance of laminated iron core of transformer in controllable excitation conditions |
| WO2016049988A1 (en) * | 2014-09-30 | 2016-04-07 | 深圳市茂润电气有限公司 | Smart matching step-down circuit and travel-use power conversion device |
| CN105929347A (en) * | 2016-07-20 | 2016-09-07 | 福州大学 | Method for quickly measuring magnetic characteristics of magnetic materials |
| US9654020B2 (en) | 2014-09-30 | 2017-05-16 | Guangdong Bestek E-Commerce Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| US9692292B2 (en) | 2014-11-04 | 2017-06-27 | Chicony Power Technology Co., Ltd. | Power supply apparatus with alternating current power detection circuit |
| CN110161447A (en) * | 2019-05-29 | 2019-08-23 | 大唐陕西发电有限公司 | A kind of 10% error check method of protective current transformer, |
| CN113253786A (en) * | 2021-05-28 | 2021-08-13 | 西南科技大学 | Current source device capable of being adjusted in multiple stages |
| CN113267658A (en) * | 2021-07-19 | 2021-08-17 | 广东电网有限责任公司惠州供电局 | Alternating current channeling fault simulation verification circuit, device and method |
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| CN202649446U (en) * | 2012-05-17 | 2013-01-02 | 东华大学 | Online detection device for magnetic biasing of half-bridge converter transformer core |
| CN102916589A (en) * | 2012-11-09 | 2013-02-06 | 扬州博尔特电气技术有限公司 | Voltage stabilizing method for tinning reflow high-power medium-frequency heating power supply |
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| CN102497115A (en) * | 2011-12-09 | 2012-06-13 | 桂林电子科技大学 | Control method of normal-pressure low-temperature plasma power supply and power supply device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016049988A1 (en) * | 2014-09-30 | 2016-04-07 | 深圳市茂润电气有限公司 | Smart matching step-down circuit and travel-use power conversion device |
| US9654020B2 (en) | 2014-09-30 | 2017-05-16 | Guangdong Bestek E-Commerce Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| USRE48368E1 (en) | 2014-09-30 | 2020-12-22 | Guangdong Bestek Medical Devices Co., Ltd. | Smart matching step-down circuits and travel-use power conversion devices |
| US9692292B2 (en) | 2014-11-04 | 2017-06-27 | Chicony Power Technology Co., Ltd. | Power supply apparatus with alternating current power detection circuit |
| CN104360294A (en) * | 2014-11-20 | 2015-02-18 | 保定天威集团有限公司 | Method and platform for testing magnetic performance of laminated iron core of transformer in controllable excitation conditions |
| CN104360294B (en) * | 2014-11-20 | 2017-08-08 | 保定天威保变电气股份有限公司 | The controllable transformer lamination Magnetic Performance Core test method of excitation condition and platform |
| CN105929347A (en) * | 2016-07-20 | 2016-09-07 | 福州大学 | Method for quickly measuring magnetic characteristics of magnetic materials |
| CN105929347B (en) * | 2016-07-20 | 2019-02-22 | 福州大学 | A kind of quick magnetic material magnetic characteristic measurement method |
| CN110161447A (en) * | 2019-05-29 | 2019-08-23 | 大唐陕西发电有限公司 | A kind of 10% error check method of protective current transformer, |
| CN113253786A (en) * | 2021-05-28 | 2021-08-13 | 西南科技大学 | Current source device capable of being adjusted in multiple stages |
| CN113267658A (en) * | 2021-07-19 | 2021-08-17 | 广东电网有限责任公司惠州供电局 | Alternating current channeling fault simulation verification circuit, device and method |
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Application publication date: 20131016 |