CN109374959B - Three-phase power supply voltage rapid detection circuit and automatic transfer switching device - Google Patents
Three-phase power supply voltage rapid detection circuit and automatic transfer switching device Download PDFInfo
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- CN109374959B CN109374959B CN201811631385.6A CN201811631385A CN109374959B CN 109374959 B CN109374959 B CN 109374959B CN 201811631385 A CN201811631385 A CN 201811631385A CN 109374959 B CN109374959 B CN 109374959B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
Abstract
The invention discloses a three-phase power supply voltage rapid detection circuit. It includes: the first optical coupler isolation voltage sampling circuit is used for sampling positive half cycle voltage of the first-phase power supply; the second optical coupling isolation voltage sampling circuit and the third optical coupling isolation voltage sampling circuit are both bidirectional optical coupling isolation voltage sampling circuits and are respectively used for sampling the full-cycle voltage of the second phase power supply and the full-cycle voltage of the third phase power supply; the fourth voltage sampling circuit is used for sampling the negative half-cycle voltage of the first-phase power supply; and the processing unit is used for extracting the zero-crossing time from the sampling data of the first optical coupling isolation voltage sampling circuit, and processing the sampling data of the first to third optical coupling isolation voltage sampling circuits and the sampling data of the fourth voltage sampling circuit by taking the zero-crossing time as a time reference to obtain a voltage detection result of the full cycle of the three-phase power supply. The invention also discloses an automatic change-over switch appliance. The invention can carry out full-cycle optical coupling isolation detection on the three-phase power supply voltage.
Description
Technical Field
The invention relates to a voltage detection circuit, in particular to a three-phase power supply voltage rapid detection circuit.
Background
The conventional power supply voltage detection circuit mainly adopts a power transformer, a voltage transformer, a resistor voltage reduction and the like to convert a high voltage signal into a low voltage signal for sampling and processing by a microprocessor, but the voltage sampling circuit generally has the defects of large volume, high cost or low cost but no isolation and the like, and is limited to the use in a small device or an application environment needing isolation.
At present, the most used voltage isolation sensing measurement scheme based on photoelectric coupling devices is applied to small devices or application environments needing isolation. The existing voltage detection circuit based on the optical coupler usually adopts the unidirectional optical coupler, but the voltage detection circuit only detects half cycle in one period, the other half cycle can not be detected, and in some application occasions requiring high response speed, certain problems can be caused to occur, for example, a normal power supply and standby power supply voltage detection circuit in a dual-power automatic transfer switch can automatically convert to another normal power supply when one path of power supply is detected to be abnormal in the process of monitoring the normal and standby power supply states, ATSE can not be detected when the other half cycle has voltage abnormality, the conversion action time of ATSE can be prolonged, under the requirement that the conversion action time of the automatic transfer switch is shorter and shorter, the performance of the automatic transfer switch can be influenced undoubtedly by adopting the prior art to perform voltage sampling.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a three-phase power supply voltage rapid detection circuit which can carry out full-cycle optical coupling isolation detection on the three-phase power supply voltage.
The invention specifically adopts the following technical scheme to solve the technical problems:
a three-phase power supply voltage rapid detection circuit includes:
the first optical coupler isolation voltage sampling circuit is used for sampling positive half cycle voltage of the first-phase power supply;
the second optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of the second-phase power supply;
the third optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of a third phase power supply;
the fourth voltage sampling circuit is used for sampling the negative half-cycle voltage of the first-phase power supply;
and the processing unit is used for extracting the zero-crossing time from the sampling data of the first optical coupling isolation voltage sampling circuit, and processing the sampling data of the first to third optical coupling isolation voltage sampling circuits and the sampling data of the fourth voltage sampling circuit by taking the zero-crossing time as a time reference to obtain a voltage detection result of the full cycle of the three-phase power supply.
Preferably, the three-phase power supply voltage rapid detection circuit further comprises a power supply circuit composed of a transformer, a rectification circuit and a voltage conversion circuit which are connected in sequence, wherein the primary side of the transformer is connected with the first-phase power supply; the fourth voltage sampling circuit is a resistance voltage division sampling circuit which is connected between two output ends of the rectifying circuit in parallel.
Furthermore, the three-phase power supply voltage rapid detection circuit further comprises a temperature detection circuit, and the processing unit performs temperature drift calibration on all optical couplers in the detection circuit according to the ambient temperature detected by the temperature detection circuit.
Preferably, the optocouplers used in the first to third optocoupler isolated voltage sampling circuits are all common optocouplers; the processing unit processes the sampling data of each optical coupling isolation voltage sampling circuit according to the following method: firstly, the current I is output according to the optical coupler in the working half cycle of the optical couplerCiCalculating a photo-coupler output current correction value I 'by the following formula'Ci：
In the formula, RCTRiThe current temperature detected by the temperature detection circuit is substituted into the temperature-relative current transmission ratio theoretical data of the common optical coupler to obtain a relative current transmission ratio; k is an optocoupler current transmission ratio correction coefficient corresponding to a certain given optocoupler input current obtained by utilizing optocoupler input current-current transmission ratio theoretical data and optocoupler input current-current transmission ratio actual measurement data of the common optocoupler in advance, and is defined as the ratio of a current transmission ratio actual measurement value to a current transmission ratio theoretical value under the condition of the given optocoupler input current;
then the optical coupler outputs a current corrected value I'CiSubstituting the optical coupler input current-current transmission ratio theoretical data of the common optical coupler to obtain a corresponding optical coupler input current value, taking the optical coupler input current value as an optical coupler input current actual value under the voltage to be measured, and calculating to obtain a voltage value of the voltage to be measured.
Preferably, theoretical data of the current-current transmission ratio and theoretical data of the temperature-relative current transmission ratio of the optical coupler of the common optical coupler are obtained from a data manual of the common optical coupler.
Preferably, the common optical coupler operates in an amplification region.
Preferably, the first to third optical coupler isolation voltage sampling circuits each include: the sampling circuit comprises a first resistor, a second resistor and an optical coupling isolation device, wherein the first resistor is connected with the primary side of the optical coupling isolation device in series, the second resistor and the secondary side of the optical coupling isolation device are connected with an internal power supply in series, and the connection point of the second resistor and the emitting electrode of the optical coupling isolation device is used as the signal output of the sampling circuit.
Preferably, the optical coupling isolation device in the first optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation device, and a reverse diode is further connected in series on the primary side of the bidirectional optical coupling isolation device.
Preferably, the optical coupling isolation device in the first optical coupling isolation voltage sampling circuit is a unidirectional optical coupling isolation device.
The three-phase power supply voltage rapid detection circuit can be widely applied to the field of low-voltage electrical appliances such as automatic change-over switches, motor protectors and the like to realize rapid and high-isolation power supply voltage detection, for example:
the utility model provides an automatic change over switching apparatus, is including being used for carrying out voltage detection's common three-phase mains voltage detection circuitry and reserve three-phase mains voltage detection circuitry respectively to common three-phase mains and reserve three-phase mains, common three-phase mains voltage detection circuitry and/or reserve three-phase mains voltage detection circuitry are as above arbitrary technical scheme three-phase mains voltage short-term test circuit.
Compared with the prior art, the technical scheme of the invention and the further improvement or preferred technical scheme thereof have the following beneficial effects:
according to the invention, the voltage isolation detection of full cycle is realized through the bidirectional optical coupling isolation voltage sampling circuit, and the voltage detection of the negative half cycle of the first-phase power supply providing a time reference is compensated through the additional fourth voltage sampling circuit, so that the timeliness of voltage abnormity detection can be effectively improved;
the invention further replaces the linear optocoupler with the common optocoupler, realizes the compensation of the nonlinear distortion and the temperature drift of the common optocoupler through software improvement, does not need to add any hardware equipment, and greatly reduces the circuit realization cost.
Drawings
FIG. 1 is a circuit diagram of a standing three-phase power supply voltage detection circuit of a dual power transfer switch in an embodiment.
Detailed Description
Aiming at the problem that a voltage detection circuit based on a unidirectional optical coupler only detects half cycle in one cycle and the other half cycle cannot be detected, the invention adopts a bidirectional optical coupler isolation voltage sampling circuit to realize voltage isolation detection of full cycle, and makes up the voltage detection of the negative half cycle of a first-phase power supply providing a time reference through an additional fourth voltage sampling circuit.
Specifically, the three-phase power supply voltage rapid detection circuit of the invention comprises:
the first optical coupler isolation voltage sampling circuit is used for sampling positive half cycle voltage of the first-phase power supply;
the second optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of the second-phase power supply;
the third optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of a third phase power supply;
the fourth voltage sampling circuit is used for sampling the negative half-cycle voltage of the first-phase power supply;
and the processing unit is used for extracting the zero-crossing time from the sampling data of the first optical coupling isolation voltage sampling circuit, and processing the sampling data of the first to third optical coupling isolation voltage sampling circuits and the sampling data of the fourth voltage sampling circuit by taking the zero-crossing time as a time reference to obtain a voltage detection result of the full cycle of the three-phase power supply.
The fourth voltage sampling circuit may adopt various existing voltage sampling circuits, such as an optical coupling isolation voltage sampling circuit, but in order to reduce the cost as much as possible, considering that common three-phase power supply voltage detection circuits all have a power supply circuit for taking power from a three-phase power supply and converting the power into a required direct-current voltage, the invention further simplifies the fourth voltage sampling circuit by using the power supply circuit, specifically as follows: the three-phase power supply voltage rapid detection circuit also comprises a power supply circuit consisting of a transformer, a rectifying circuit and a voltage conversion circuit which are connected in sequence, wherein the primary side of the transformer is connected with a first-phase power supply; the fourth voltage sampling circuit is a resistance voltage division sampling circuit which is connected between two output ends of the rectifying circuit in parallel. Therefore, the negative half cycle sampling of the first-phase power supply voltage can be realized only by the simplest resistance voltage division sampling circuit, and the cost of the circuit is obviously reduced.
In addition, in order to further reduce the circuit cost, the invention further constructs a voltage detection circuit based on the common optical coupler, and simultaneously realizes the compensation of the nonlinear distortion and the temperature drift of the common optical coupler through software improvement without adding any hardware equipment. Specifically, the optocouplers used in the first to third optocoupler isolated voltage sampling circuits are all common optocouplers; the processing unit processes the sampling data of each optical coupling isolation voltage sampling circuit according to the following method: firstly, the current I is output according to the optical coupler in the working half cycle of the optical couplerCiCalculating a photo-coupler output current correction value I 'by the following formula'Ci：
In the formula, RCTRiThe current temperature detected by the temperature detection circuit is substituted into the temperature-relative current transmission ratio theoretical data of the common optical coupler to obtain a relative current transmission ratio; k is an optocoupler current transmission ratio correction coefficient corresponding to a certain given optocoupler input current obtained by utilizing optocoupler input current-current transmission ratio theoretical data and optocoupler input current-current transmission ratio actual measurement data of the common optocoupler in advance, and is defined as the ratio of a current transmission ratio actual measurement value to a current transmission ratio theoretical value under the condition of the given optocoupler input current;
then the optical coupler outputs a current corrected value I'CiSubstituting the optical coupler input current-current transmission ratio theoretical data of the common optical coupler to obtain the corresponding optical couplerAnd inputting a current value, taking the optical coupler input current value as an actual value of the optical coupler input current under the voltage to be measured, and calculating to obtain a voltage value of the voltage to be measured.
Through the further improvement, the invention can realize the rapid and accurate isolation detection of the three-phase power supply voltage with extremely low cost, and can be widely applied to automatic transfer switching equipment, motor protectors and the like.
For the public to understand, the technical scheme of the invention is further explained in detail by a specific embodiment and the accompanying drawings:
taking the voltage detection of the dual power transfer switch as an example, the dual power transfer switch has a common three-phase power supply voltage detection circuit and a standby three-phase power supply voltage detection circuit, both of which are the three-phase power supply voltage rapid detection circuit of the present invention, and share the same microprocessor as a processing unit. As shown in FIG. 1, the whole voltage detection part comprises a microprocessor U1, a temperature detection circuit U2, a power supply circuit, a normal fourth voltage sampling circuit, a standby fourth voltage sampling circuit, a normal first voltage sampling circuit, a normal second voltage sampling circuit, a normal third voltage sampling circuit and a standby first voltage sampling circuit, a standby second voltage sampling circuit and a standby third voltage sampling circuit. As shown in fig. 1, the power supply circuit includes a common power transformer T1, a bridge stack B1, a diode D3, a standby power transformer T2, a bridge stack B2, a diode D4, a voltage conversion chip U3, and filter capacitors E1 and E2; the common fourth voltage sampling circuit comprises resistors R13 and R14 which are connected in series, wherein the resistors R13 and R14 are connected in series and then bridged at the output side of the bridge stack B1, and the connection points of the resistors R13 and R14 are connected with a microprocessor U1; the standby fourth voltage sampling circuit comprises resistors R15 and R16 which are connected in series, the resistors R15 and R16 are connected in series and then bridged at the output side of the bridge stack B2, and the connection points of the resistors R15 and R16 are connected with the microprocessor U1. The common first voltage sampling circuit comprises a diode D1, a resistor R1, a bidirectional optical coupler TL1 and a resistor R7, the diode D1 and the resistor R1 are connected with the primary side of the bidirectional optical coupler TL1 in series, the resistor R7 and the secondary side of the bidirectional optical coupler TL1 are connected with an internal power supply VCC in series, the resistor R7 and the emitter or collector of the optical coupler are connected to a microprocessor U1 (in the example, the resistor R7 is connected with the emitter of the optical coupler), the bidirectional optical coupler TL1 in the first voltage sampling circuit can also adopt a unidirectional optical coupler, and the diode D1 is not needed. The common second voltage sampling circuit comprises a resistor R2, a bidirectional optocoupler TL2 and a resistor R8, wherein the resistor R2 is connected with the primary side of the bidirectional optocoupler TL2 in series, the secondary sides of the resistor R8 and the bidirectional optocoupler TL2 are connected with an internal power supply VCC in series, and the emitter or collector of the resistor R8 and the bidirectional optocoupler TL2 are connected to the microprocessor U1 (in the example, the resistor R8 is connected with the emitter of the optocoupler). As shown in fig. 1, the principle of the standby first voltage sampling circuit is the same as that of the common first voltage sampling circuit, and is not repeated; the principle of the common third voltage sampling circuit, the standby second voltage sampling circuit and the standby third voltage sampling circuit is the same as that of the common second voltage sampling circuit, and the description is omitted.
In order to ensure the rapidity of power supply voltage detection, the bidirectional optical coupler is adopted for voltage sampling, so that the output voltage waveform of the optical coupler is continuous, if the unidirectional optical coupler is adopted, the output voltage of the optical coupler is caused to be intermittent (only positive half-cycle waveform and no negative half-cycle waveform are included in the output periodic waveform), the microprocessor calculates the voltage effective value according to 1/2 cycles of a power supply, the voltage effective value is 1 time faster than that of the unidirectional optical coupler in power supply cycle, and the load outage time of ATSE is reduced; because the first voltage sampling circuit is half-wave detection (because a reference moment needs to be acquired, the first voltage sampling circuit needs to be half-wave detection when the bidirectional optical couplers are corrected (which one of the bidirectional optical couplers is used for determining operation) and is needed to be used in subsequent operation (when positive half-cycle voltage and negative half-cycle voltage are calculated), when the negative half-cycle is power-off, the microprocessor cannot detect the power-off, the problem is solved through the fourth voltage sampling circuit, the fourth voltage sampling circuit samples the power voltage which is the same as that of the first voltage sampling circuit, and the microprocessor simultaneously collects the output voltages of the first voltage sampling circuit and the fourth voltage sampling circuit, so that whether the power supply is abnormal or not is detected in 1/2 periods of the power supply.
In order to reduce the cost as much as possible on the basis of ensuring the detection precision, in the embodiment, the optocouplers in the optocoupler-isolation devices in the optocoupler-isolation voltage sampling circuits do not adopt high-price linear optocouplers, but adopt much lower-price common optocouplers, and the common optocouplers cause a linear area due to the inherent volt-ampere characteristics of internal light-emitting diodes and phototriodes of the common optocouplersThe invention corrects the nonlinear distortion of the common optical coupler in a software mode and corrects the temperature drift by the temperature detected by the temperature detection circuit to solve the problem that the nonlinear distortion is small and has a certain degree of nonlinear distortion, and the nonlinear distortion can not be generally applied to linear isolation voltage sampling. Theoretical data of the input current-current transmission ratio of the optical coupler and theoretical data of the temperature-relative current transmission ratio required by optical coupler correction can be obtained from a data manual of the common optical coupler. Due to the manufacturing difference of the optical couplers, an optical coupler manufacturer can only ensure that the current transmission ratio is within a certain range and cannot provide a fixed value, so that the current transmission ratio of each optical coupler is different, and in order to ensure the voltage detection precision, each optical coupler needs to be corrected in advance to obtain the determined current transmission ratio of the optical coupler; further, although the manufacturers have the same manufacturing process for the forward and reverse light emitting diodes when the bidirectional optical coupler is manufactured, the forward and reverse tubes still have differences, and forward and reverse current transmission ratios of the bidirectional optical coupler need to be respectively corrected to obtain higher voltage detection accuracy. In addition, it is preferable to ensure that the optocoupler operates in the amplification region, i.e. IC≥IFAnd multiplying CTR, wherein CTR is an upper limit value of a current transmission ratio range declared in the optocoupler data manual, so that the optocoupler is ensured to work in an amplification area within the whole input voltage range, and the output voltage of the optocoupler can faithfully reflect the input voltage of the power supply voltage detection circuit.
The temperature sensor in the temperature detection circuit is preferably arranged in the center area of the positions of the six common optical couplers so as to ensure the accuracy of the temperature detection of the optical couplers.
The specific process for realizing the permanent three-phase power supply voltage detection of the automatic change-over switch by using the upper circuit is as follows:
1) the input current-current transmission ratio (I) of the optical coupler provided by the optical coupler data manualFCTR (coefficient of variation) graph establishing optical coupler input current-output current (I)F-IC) A one-to-one correspondence data table A, wherein IC＝IF×CTR；
2) Establishing a temperature-relative current transmission ratio (T-RCTR) one-to-one corresponding relation data table B according to a temperature-relative current transmission ratio (T-RCTR) curve diagram provided by an optocoupler data manual;
3) setting optical coupling input current I in common first voltage sampling circuitF1I.e. given input supply voltage U1Wherein, in the step (A),
R1for the optical coupler to input the side current limiting resistor, the microprocessor detects the output signal V1A1 of the first voltage sampling circuit, records the positive zero-crossing time of the output signal, and samples the output voltage U of odd number of half periods following the positive zero-crossing time as the reference2Calculating the output current IC1Current transmission ratio of optical coupler
According to the input current-current transmission ratio (I) of the optical couplerFCTR) data Table A finds the input current IF1Lower corresponding theoretical current transfer ratio CTR0Calculating the current transmission ratio correction coefficient K of the optical coupler1,
The microprocessor samples the next even number of half-cycle output voltages U3Calculating the output current IC2Current transmission ratio of optical coupler
According to the input current-current transmission ratio (I) of the optical couplerFCTR) data Table A finds the input current IF1Lower corresponding theoretical current transfer ratio CTR0Calculating the current transmission ratio correction coefficient K of the optical coupler2,
Giving the same optocoupler input current as the first voltage sampling circuit in the second and third common voltage sampling circuits, and similarly acquiring a correction coefficient of the forward and reverse current transmission ratio of the optocoupler by taking the forward zero-crossing time of the output voltage of the first voltage sampling circuit as a reference; obtaining the standby first, second and third voltages in the same wayA sampling circuit optically couples a correction coefficient of a forward and reverse current transmission ratio;
4) the microprocessor detects the output voltage of the optical coupler in real time and calculates the output current I of the optical couplerCi；
5) The microprocessor detects the output signal VTE of the temperature detection circuit U2 and calculates the temperature T at the moment1And finding out the relative current transmission ratio RCTR of the optical coupler according to a temperature-relative current transmission ratio (T-RCTR) data table Bi；
6) Computing
(odd number of half cycles),
(even half cycle, only second and third voltage detection circuits) according to l'Ci1、I′Ci2And data table A finds IFiCalculate Ui＝IFi×R1Then to UiCalculating the effective value to obtain an input voltage value;
7) the microprocessor detects the output voltage of the common and standby fourth voltage sampling circuits and converts the output voltage into input voltage according to an effective value algorithm;
8) the microprocessor calculates the effective value by taking the power supply period as the sampling period, adopts a window-shifting algorithm, takes the window period as the power supply period, takes the collected power-losing signal of the fourth voltage sampling circuit as the abnormal judgment of the common power supply when detecting the power-losing of the output signal of the common fourth voltage sampling circuit, and judges whether the common power supply is abnormal or not by taking the voltage signal detected by the first voltage detection circuit when detecting the power-losing of the output signal of the fourth voltage sampling circuit; the standby power supply is the same.
Claims (10)
1. A three-phase power supply voltage rapid detection circuit is characterized by comprising:
the first optical coupler isolation voltage sampling circuit is used for sampling positive half cycle voltage of the first-phase power supply;
the second optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of the second-phase power supply;
the third optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation voltage sampling circuit and is used for sampling the full-cycle voltage of a third phase power supply;
the fourth voltage sampling circuit is used for sampling the negative half-cycle voltage of the first-phase power supply;
and the processing unit is used for extracting the zero-crossing time from the sampling data of the first optical coupling isolation voltage sampling circuit, and processing the sampling data of the first to third optical coupling isolation voltage sampling circuits and the sampling data of the fourth voltage sampling circuit by taking the zero-crossing time as a time reference to obtain a voltage detection result of the full cycle of the three-phase power supply.
2. The rapid detection circuit for three-phase power supply voltage according to claim 1, further comprising a power supply circuit composed of a transformer, a rectifying circuit, and a voltage converting circuit connected in sequence, wherein the primary side of the transformer is connected to the first-phase power supply; the fourth voltage sampling circuit is a resistance voltage division sampling circuit which is connected between two output ends of the rectifying circuit in parallel.
3. The circuit for rapidly detecting the voltage of a three-phase power supply according to claim 1, further comprising a temperature detection circuit, wherein the processing unit performs temperature drift calibration on all the optical couplers in the detection circuit according to the ambient temperature detected by the temperature detection circuit.
4. The three-phase power supply voltage rapid detection circuit according to claim 3, wherein the optical couplers used in the first to third optical coupler isolation voltage sampling circuits are common optical couplers; the processing unit processes the sampling data of each optical coupling isolation voltage sampling circuit according to the following method: firstly, the current I is output according to the optical coupler in the working half cycle of the optical couplerCiCalculating the correction value I of the output current of the optical coupler by the following formulaC′i：
In the formula, RCTRiThe current temperature detected by the temperature detection circuit is substituted into the temperature-relative current transmission ratio theoretical data of the common optical coupler to obtain a relative current transmission ratio; k is an optocoupler current transmission ratio correction coefficient corresponding to a certain given optocoupler input current obtained by utilizing optocoupler input current-current transmission ratio theoretical data and optocoupler input current-current transmission ratio actual measurement data of the common optocoupler in advance, and is defined as the ratio of a current transmission ratio actual measurement value to a current transmission ratio theoretical value under the condition of the given optocoupler input current;
then the output current of the optical coupler is corrected to be IC′iSubstituting the optical coupler input current-current transmission ratio theoretical data of the common optical coupler to obtain a corresponding optical coupler input current value, taking the optical coupler input current value as an optical coupler input current actual value under the voltage to be measured, and calculating to obtain a voltage value of the voltage to be measured.
5. The circuit for rapidly detecting the voltage of the three-phase power supply according to claim 4, wherein theoretical data of the current-current transmission ratio and theoretical data of the temperature-relative current transmission ratio of the optical coupler of the common optical coupler are obtained from a data manual of the common optical coupler.
6. The circuit for rapidly detecting the voltage of a three-phase power supply of claim 4, wherein the common optical coupler operates in an amplification region.
7. The circuit for rapidly detecting the voltage of a three-phase power supply according to claim 1, wherein the first to third optically coupled isolation voltage sampling circuits each comprise: the sampling circuit comprises a first resistor, a second resistor and an optical coupling isolation device, wherein the first resistor is connected with the primary side of the optical coupling isolation device in series, the second resistor and the secondary side of the optical coupling isolation device are connected with an internal power supply in series, and the connection point of the second resistor and the optical coupling isolation device is used as the signal output of the sampling circuit.
8. The circuit for rapidly detecting the voltage of a three-phase power supply according to claim 7, wherein the optical coupling isolation device in the first optical coupling isolation voltage sampling circuit is a bidirectional optical coupling isolation device, and a reverse diode is further connected in series on a primary side of the bidirectional optical coupling isolation device.
9. The rapid detection circuit of three-phase power supply voltage according to claim 7, wherein the optical coupling isolation device in the first optical coupling isolation voltage sampling circuit is a unidirectional optical coupling isolation device.
10. An automatic transfer switching apparatus, comprising a common three-phase power supply voltage detection circuit and a standby three-phase power supply voltage detection circuit for respectively detecting the voltage of a common three-phase power supply and a standby three-phase power supply, characterized in that the common three-phase power supply voltage detection circuit and/or the standby three-phase power supply voltage detection circuit is the three-phase power supply voltage rapid detection circuit as claimed in any one of claims 1 to 9.
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| CN105785141A (en) * | 2015-12-31 | 2016-07-20 | 常州电站辅机总厂有限公司 | Three-phase power supply phase sequence and default phase detecting circuit for electric actuating mechanism |
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