CN102368616B - Power factor compensation control circuit of self-turn-off device - Google Patents
Power factor compensation control circuit of self-turn-off device Download PDFInfo
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- CN102368616B CN102368616B CN201110390977.5A CN201110390977A CN102368616B CN 102368616 B CN102368616 B CN 102368616B CN 201110390977 A CN201110390977 A CN 201110390977A CN 102368616 B CN102368616 B CN 102368616B
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- 239000003990 capacitor Substances 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 230000005611 electricity Effects 0.000 claims description 5
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- 238000001914 filtration Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a power factor compensation control circuit of a self-turn-off device. The power factor compensation control circuit mainly comprises a switch circuit, a logic drive circuit, a pulse width modulation circuit, a zero point detection circuit, a power factor detection circuit, a filter circuit and a capacitor. By using the characteristic of turn-off control of the self-turn-off device, two self-turn-off devices connected in parallel with diodes are adopted to form the switch circuit, and the switch circuit is controlled to carry out charge and discharge voltage control on the capacitor, thus the control over the power factor compensation is realized. According to the power factor compensation control device manufactured in the invention, the number of the control circuit is reduced by using one group of capacitor to replace multiple groups of traditional combined capacitors, the loss is little because a zero point soft switch controls charge and discharge, not only can automatic control be realized, but also the advantages of simple structure, low cost, convenience for use and maintenance, and the like are achieved, and the power factor compensation control circuit is especially suitable for wide range of users consuming power of thousands Watt to tens of thousands of Watt.
Description
Technical field
The invention belongs to electric power project engineering field, the control of power consumption equipment power factor compensation.
Background technology
Utilizing capacitor to carry out power factor compensation is to popularize at present and generally acknowledged power-saving method, and existing compensating circuit mostly combines control by computer to many groups power capacitor, realizes the quantitative compensation of power factor.It is excessive that power capacitor generally adopts current-limiting resistance or inductance to limit immediate current in the time of switching, exists volume large, loss and high in cost of production shortcoming.Though novel SCR control switching at zero point can overcome above-mentioned deficiency, but due to intrinsic non-from turn-off characteristic of silicon-controlled device, can only solve the current limliting problem of switching, and cannot adapt to the requirement of dynamic control and compensation electric current with load variations, unavoidably cause undercompensation and overcompensation; On the other hand, multiple unit capacitor combination causes compensation equipment complex structure, and cost is high, use and maintenance difficult, and this compensation equipment is only applicable to high-power user, and be not suitable for that electricity consumption is in the great majority kilowatt to the user of tens kilowatts, thereby seriously restrict popularization and the application of compensation equipment.
Summary of the invention
For the deficiencies in the prior art, the technical problem to be solved in the present invention is that a kind of power factor compensation control circuit is provided.This control circuit adopts reverse parallel connection to be connected with the switching circuit of two self-turn-off device compositions of diode, by the break-make of the self-turn-off device in logic drive circuit, pulse-width modulation circuit, zero-detection circuit and detection circuit of power factor control switch circuit, with the height of control capacitor charging/discharging voltage, the size of regulating capacitor offset current, realizes the control to capacitor power factor compensation.
The technical solution adopted for the present invention to solve the technical problems is that a kind of power factor compensation control circuit of self-turn-off device is made up of switching circuit, logic drive circuit, pulse-width modulation circuit, zero-detection circuit, detection circuit of power factor, filter circuit, capacitor and alternating current input H, output M and common N.
Described switching circuit is made up of two self-turn-off device T1, T2 and two diode D1, D2, the anode and cathode of self-turn-off device T1, T2 is connected with the anode and cathode reverse parallel connection of diode D1, D2 respectively, the negative electrode of two self-turn-off device T1 and T2 is connected for the common port of switching circuit, the control of T1 and T2 is two control end q and the r of switching circuit very, and the anode of T1 and T2 is respectively two end points of switching circuit switch.In the positive half period of alternating current, T1 carries out voltage adjustable charging to capacitor and controls, and T2 is to discharging capacitors control; In the negative half-cycle of alternating current, T2 carries out voltage adjustable charging to capacitor and controls, and T1 is to discharging capacitors control; Thereby it is adjustable to have realized voltage on capacitor in ac period sex work, and then adjust the electric current of the power factor compensation of capacitor to power supply.Described self-turn-off device T1 and T2 comprise that gate pole assists cutoff thyristor, field-effect transistor, common transistor, igbt and have the electronic device from turn-off characteristic.
Described logic drive circuit is made up of two two input OR circuit M1 and M2, the b end of OR circuit M1 is connected for charging control end with the d end of OR circuit M2, the control of discharge end that a end of OR circuit M1 is the negative half period of alternating current, the control of discharge end that the c end of OR circuit M2 is the positive half cycle of alternating current; Can between the control end q of self-turn-off device T1 and the control end r of the output of OR circuit M1 and self-turn-off device T2 and the output of OR circuit M2, increase driving stage (prior art) respectively according to the needs of the self-turn-off device driving power of selecting.
Described detection circuit of power factor is made up of transformer B, current transformer DL, phase comparator yx; Described filter circuit is by inductance L, and capacitor C1 and C2 composition, for current filtering; Alternating current is inputted by input H, and the current transformer DL in described detection circuit of power factor, by holding M output, forms the power supply for load with common N; The voltage waveform that the secondary coil of transformer B in described detection circuit of power factor detects carries out after phase bit comparison through the phase comparator yx in described detection circuit of power factor with the current waveform that the interior current transformer DL of described detection circuit of power factor detects, sends the modulation voltage of analog value according to the power factor value of load to described pulse-width modulation circuit.
The Synchronization Control pulse that described pulse-width modulation circuit sends according to modulation voltage value and described zero-detection circuit, hold to the b end of the OR circuit M1 in control logic drive circuit and the d of OR circuit M2 the pulse that certain width is provided, in alternating current 0-π positive half period, drive the control end q of the self-turn-off device T1 in described switching circuit to control self-turn-off device T1 conducting, through diode D2 to the capacitor control of charging, the charging interval take 0 as starting point adjustable in 0-pi/2 week scope; In the π negative half-cycle of alternating current π-2, drive the control end r of the self-turn-off device T2 in described switching circuit to control self-turn-off device T2 conducting, through diode D1 to the capacitor control of charging, the charging interval take π point as starting point adjustable within the scope of the pi/2 of π-3.
The positive-negative half-cycle alternating voltage waveform that described zero-detection circuit detects according to the secondary coil of the transformer B in detection circuit of power factor, provides alternating voltage lock-out pulse at zero point to described pulse-width modulation circuit; Simultaneously within the interchange positive electricity half period, c end to OR circuit M2 in described logic drive circuit provides the square wave of synchronizeing with positive half cycle alternating voltage, the control end r of self-turn-off device T2 in described switching circuit controls self-turn-off device T2 conducting, when supply voltage is during lower than capacitor voltage at both ends, the electric charge being stored in capacitor is discharged telegram in reply source by the diode D1 in described switching circuit; In alternating current negative half-cycle, a end to the OR circuit M1 in described logic drive circuit provides the square wave of synchronizeing with negative half period alternating voltage, the control end q of self-turn-off device T1 in described switching circuit controls self-turn-off device T1 conducting, when supply voltage is during lower than capacitor voltage at both ends, the electric charge being stored in capacitor is discharged telegram in reply source by the diode D2 in described switching circuit.
The charging/discharging voltage of this circuit control capacitor in the cycling of alternating current, has regulated the size of offset current, has realized the control of capacitor to power factor compensation.The present invention is owing to adopting common cathode mode only to power with D.C. regulated power supply with one.GND is the common port of switching circuit, logic drive circuit, pulse-width modulation circuit, zero-detection circuit and detection circuit of power factor.As using as described in power factor compensation control circuit of self-turn-off device as 1 unit, with combining 3 unit, can carry out power factor compensation control by electric loading to three-phase alternating current.
Beneficial effect of the present invention is, owing to adopting the ON time of pulse width modulation controlled self-turn-off device, the charging/discharging voltage of compensation condenser is controlled, and has controlled offset current size, and then has realized the automatic control to power factor compensation.When charging, adopt zero-point voltage conducting self-turn-off device, reduced turn-on consumption, when electric discharge, utilize supply voltage lower than capacitor terminal voltage naturally discharge no-voltage conducting and zero-current switching, further reduce turn-off power loss, greatly improved efficiency.The self-turn-off device power factor compensation equipment made from the present invention, substitute to organize combined capacitors with a group capacitor more, reduced control circuit quantity, and simple in structure, volume is little, cost is low, easy maintenance, is especially applicable to electricity consumption kilowatt to the users of tens kilowatts.
Accompanying drawing explanation
The example circuit schematic diagram that Fig. 1 power factor compensation control circuit of self-turn-off device is implemented
Number in the figure:
1, switching circuit
2, logic drive circuit
3, pulse-width modulation circuit
4, zero-detection circuit
5, detection circuit of power factor
6, filter circuit
7, capacitor
Each point waveform when Fig. 2 works
(1), capacitor charging/discharging voltage waveform
(2), q point drive waveforms
(3), r point drive waveforms
(4), b, d point charging control waveform
(5), c point control of discharge waveform
(6), a point control of discharge waveform
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is described in further details.
The present invention is a kind of power factor compensation control circuit of self-turn-off device.Fig. 1 is the circuit theory diagrams that utilize a kind of self-turn-off device capacitor power factor compensation control device of this circuit enforcement.This electric routing switch circuit 1, logic drive circuit 2, pulse-width modulation circuit 3, zero-detection circuit 4, detection circuit of power factor 5, filter circuit 6, capacitor 7 and alternating current input H, output M and common port ground N composition.When input H and common N incoming transport electricity, output M and common N connect load, the capacitor C1 of electric current in filter circuit 6, and inductance L, after capacitor C2 filtering, forms loop by capacitor 7 through switching circuit 1.The voltage waveform detecting that the current waveform detecting is passed to the secondary coil of the transformer B in phase comparator yx and detection circuit of power factor 5 by current transformer DL when work in detection circuit of power factor 5 carries out after phase bit comparison, pass to pulse-width modulation circuit 3 with voltage form, the voltage waveform that zero-detection circuit 4 detects according to the secondary coil of the transformer B in detection circuit of power factor 5 simultaneously sends lock-out pulse voltage at zero point to pulse-width modulation circuit 3, pulse-width modulation circuit 3 again according to receive zero point lock-out pulse voltage and modulation voltage height export corresponding pulsewidth voltage waveform, as shown in Fig. 2 (4), output pulse width width in alternating current positive-negative half-cycle respectively take zero point and π point as starting point cyclic variation in 0-pi/2 and π-3 pi/2.Alternating voltage periodic pulse train, in order to the b end of the OR circuit M1 in control logic drive circuit 2 and the d end of OR circuit M2, control T1 conducting at the positive half cycle of alternating current by the control end q of the self-turn-off device T1 in switching circuit 1, the diode D2 in switching circuit 1 is to capacitor 7 control of charging; Negative half period at alternating current is controlled T2 conducting by the control end r end of the self-turn-off device T2 in switching circuit 1, diode D1 in switching circuit 1 is to capacitor 7 control of charging, capacitor charge waveforms is as shown in Fig. 2 (1), and in figure, black area is capacitor 7 charging and discharging waveforms.The positive-negative half-cycle of the alternating voltage that zero-detection circuit 4 is inducted the transformer B secondary coil in detection circuit of power factor 5 is divided into positive half cycle square wave and negative half period square wave, positive half cycle square wave exports the c end of OR circuit M2 to, control end r by the self-turn-off device T2 in switching circuit 1 controls T2 conducting, diode D1 in switching circuit 1 carries out control of discharge to capacitor 7, as shown in Fig. 2 (5); Negative half-cycle square wave exports a end of OR circuit M1 to, controls T1 conducting by the control end q of the self-turn-off device T1 in switching circuit 1, and the diode D2 in switching circuit 1 carries out control of discharge to capacitor 7, as shown in Fig. 2 (6).The black part of Fig. 2 (1) is divided into the voltage waveform at capacitor 7 two ends after control, this circuit has been realized at self-turn-off device and having been started zero point capacitor charging, the low-power consumption switch control of zero-point voltage to capacitor discharge with terminal voltage in the work of ac period.Be public terminal GND because control circuit of the present invention adopts common cathode mode, switching circuit, logic drive circuit, pulse-width modulation circuit, zero-detection circuit and detection circuit of power factor only, with single power supply power supply, are simplified circuit.
The self-turn-off device capacitor power factor compensation control device that utilizes power factor compensation control circuit of self-turn-off device of the present invention to make, compensation factor capable of dynamic is controlled automatically, the soft switch of self-turn-off device, has the advantages such as loss is little, efficiency is high, volume is little, simple in structure, cost is low, convenient maintenance.
Claims (4)
1. a power factor compensation control circuit of self-turn-off device, is characterized in that: this circuit comprises switching circuit (1), logic drive circuit (2), pulse-width modulation circuit (3), zero-detection circuit (4), detection circuit of power factor (5), filter circuit (6) and capacitor (7); Described logic drive circuit (2) is made up of two two input OR circuit M1 and M2, the b end of OR circuit M1 is connected with the d end of OR circuit M2, for charging control end, the control of discharge end that a end of OR circuit M1 is the negative half period of alternating current, the control of discharge end that the c end of OR circuit M2 is the positive half cycle of alternating current; The Synchronization Control pulse that described pulse-width modulation circuit (3) sends according to modulation voltage value and described zero-detection circuit (4), hold to the b end of the interior OR circuit M1 of control logic drive circuit (2) and the d of OR circuit M2 the pulse that certain width is provided, in alternating current 0-π positive half period, drive the control end q of the self-turn-off device T1 in described switching circuit (1) to control self-turn-off device T1 conducting, through diode D2 to the capacitor control of charging, the charging interval take 0 as starting point adjustable in 0-pi/2 week scope; In the π negative half-cycle of alternating current π-2, drive the control end r of the self-turn-off device T2 in described switching circuit (1) to control self-turn-off device T2 conducting, through diode D1 to the capacitor control of charging, the charging interval take π point as starting point adjustable within the scope of the pi/2 of π-3.
2. a kind of power factor compensation control circuit of self-turn-off device according to claim 1, it is characterized in that: described switching circuit (1) is by two self-turn-off device T1, T2 and two diode D1, D2 composition, the anode and cathode of self-turn-off device T1 is connected with the anode and cathode reverse parallel connection of diode D1, the anode and cathode of self-turn-off device T2 is connected with the anode and cathode reverse parallel connection of diode D2, the negative electrode of two self-turn-off device T1 and T2 is connected, as the common port of switching circuit (1), the control of T1 and T2 is two control end q and the r of switching circuit (1) very, the anode of T1 and T2 is respectively two end points of switching circuit (1) switch.
3. a kind of power factor compensation control circuit of self-turn-off device according to claim 1, it is characterized in that: the current waveform that the instrument transformer DL in the voltage waveform that the secondary coil of the transformer B in described detection circuit of power factor (5) detects and described detection circuit of power factor (5) detects, phase comparator yx in described detection circuit of power factor (5) carries out after phase bit comparison, sends corresponding modulation voltage value according to the power factor value of load to described pulse-width modulation circuit (3).
4. a kind of power factor compensation control circuit of self-turn-off device according to claim 1, it is characterized in that: described zero-detection circuit (4) obtains positive-negative half-cycle alternating voltage waveform according to the secondary coil of the transformer B in detection circuit of power factor (5), provides alternating voltage lock-out pulse at zero point to described pulse-width modulation circuit (3); Simultaneously within the interchange positive electricity half period, c end to the interior OR circuit M2 of described logic drive circuit (2) provides the square wave of synchronizeing with positive half cycle alternating voltage, the control end r of self-turn-off device T2 in described switching circuit (1) controls self-turn-off device T2 conducting, when supply voltage is during lower than capacitor voltage at both ends, the electric charge being stored in capacitor is discharged telegram in reply source by the diode D1 in described switching circuit (1); In alternating current negative half-cycle, a end to the interior OR circuit M1 of described logic drive circuit (2) provides the square wave of synchronizeing with negative half period alternating voltage, the control end q of self-turn-off device T1 in described switching circuit (1) controls self-turn-off device T1 conducting, when supply voltage is during lower than capacitor voltage at both ends, the electric charge being stored in capacitor is discharged telegram in reply source by the diode D2 in described switching circuit (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110390977.5A CN102368616B (en) | 2011-12-02 | 2011-12-02 | Power factor compensation control circuit of self-turn-off device |
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| CN201110390977.5A CN102368616B (en) | 2011-12-02 | 2011-12-02 | Power factor compensation control circuit of self-turn-off device |
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| CN102368616A CN102368616A (en) | 2012-03-07 |
| CN102368616B true CN102368616B (en) | 2014-06-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102761130A (en) * | 2012-04-30 | 2012-10-31 | 李香龙 | Automatically-controlled power factor compensation circuit |
| CN102761129A (en) * | 2012-04-30 | 2012-10-31 | 李香龙 | Automatic power factor compensation circuit utilizing electrolytic capacitor |
| CN102857114A (en) * | 2012-10-12 | 2013-01-02 | 天津工业大学 | Alternating-current voltage stabilizing circuit of transformer without power supply |
| RU2760407C1 (en) * | 2021-03-22 | 2021-11-24 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Воронежский государственный технический университет" | Condenser unit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2270987Y (en) * | 1995-10-25 | 1997-12-17 | 华东冶金学院 | Sine envelope high frequency modulation ac voltage regulator |
| CN101789603A (en) * | 2010-03-17 | 2010-07-28 | 天津理工大学 | Method and circuit for alternating-current dynamic active power factor compensation |
| CN202353225U (en) * | 2011-12-02 | 2012-07-25 | 李香龙 | Power factor compensation control circuit of self-turn-off device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2270987Y (en) * | 1995-10-25 | 1997-12-17 | 华东冶金学院 | Sine envelope high frequency modulation ac voltage regulator |
| CN101789603A (en) * | 2010-03-17 | 2010-07-28 | 天津理工大学 | Method and circuit for alternating-current dynamic active power factor compensation |
| CN202353225U (en) * | 2011-12-02 | 2012-07-25 | 李香龙 | Power factor compensation control circuit of self-turn-off device |
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