CN112816760A - Alternating-current high-voltage detection device and method for medium-high voltage soft starter - Google Patents
Alternating-current high-voltage detection device and method for medium-high voltage soft starter Download PDFInfo
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Abstract
The invention discloses an alternating current high voltage detection device and method for a medium and high voltage soft starter.A voltage sampling module is adopted to take a three-phase input alternating voltage B phase as a reference ground, a high voltage sampling resistor is utilized to divide a three-phase input alternating voltage A phase and then input the three-phase input alternating voltage A phase into a single-phase isolation transformer, low voltage alternating current signals are output through isolation and subjected to shaping and filtering processing, and direct current voltage signals are transmitted to a shaping module for shaping and filtering processing and then transmitted to a signal processing module as power supply voltage; converting the voltage signal transmitted by the shaping module into two paths of direct current components by using a signal processing module, and superposing the two paths of direct current components with the other two paths of alternating current voltage signals to obtain a PWM wave with a certain pulse width; and finally, the transmitting end of the signal isolation output module is used for transmitting the signal isolation output module into a rear-stage circuit, and the rear-stage circuit is used for modulating and demodulating the PWM wave, so that the voltage detection of the medium-high voltage soft starter can be realized. The invention has higher safety, high detection result precision and strong anti-interference capability.
Description
Technical Field
The invention relates to the technical field of high-voltage detection, in particular to an alternating-current high-voltage detection device and method for a medium-high voltage soft starter.
Background
The soft starter is a motor control device which integrates the functions of electrode soft start, soft stop, light load energy saving and multiple protection.
A general medium-high voltage motor soft starter adopts a voltage transformer to sample, and in a 10KV neutral point ungrounded system, as the nonlinear excitation inductance of the voltage transformer and the system grounding capacitance generate ferromagnetic resonance when the line voltage has fluctuation and mutation, the voltage of the voltage transformer rises, the magnetic core of the voltage transformer tends to be saturated, the current of a primary coil increases sharply, and finally the voltage transformer is burnt out due to overheating and even explosion accidents occur, so that the resonance and the easy overvoltage exist when the voltage transformer is used, and great potential safety hazards exist. Meanwhile, the voltage transformer also has the defects of large volume, space requirement for installation, high cost, poor economy and the like. Therefore, some novel electronic voltage transformers appear for voltage detection, and generally adopt the principles of resistance voltage division, resistance-capacitance voltage division or capacitance voltage division. Although the voltage transformer using the voltage division principle has the advantages of small volume, light weight, simple structure, good linearity, no resonance, no iron core saturation, no load sharing, short circuit and open circuit permission and higher reliability, the detected voltage has the following characteristics: 1. primary input and secondary output are not isolated, so that great potential safety hazard exists; 2. the output voltage signal is weak, and is easy to be interfered by the outside, and the detection result has low precision.
Disclosure of Invention
In order to overcome the problems of the existing high-voltage detection technology, the invention discloses an alternating-current high-voltage detection device and method for a medium-high voltage soft starter.
In order to achieve the purpose, the invention adopts the following technical scheme:
an alternating current high voltage detection device for a medium-high voltage soft starter comprises a voltage sampling module, a shaping module and a signal processing module, wherein the shaping module and the signal processing module are connected with the voltage sampling module;
the voltage sampling module comprises a first voltage acquisition circuit, a second voltage acquisition circuit and a third voltage acquisition circuit, the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit all use the A phase of the three-phase alternating current circuit as a reference ground, the first voltage acquisition circuit is connected in series between the A phase and the B phase of the three-phase alternating current circuit, and the acquired voltage signals are transmitted to the shaping module; the second voltage acquisition circuit is connected in series between the phase A and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module; the third voltage acquisition circuit is connected in series between the phase C and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module;
the shaping module is used for carrying out shaping filtering processing on the received voltage signal and then transmitting the voltage signal to the signal processing module as a power supply voltage;
the signal processing module is used for converting the voltage signals transmitted by the shaping module into two paths of direct current components, respectively superposing the two paths of direct current components with the other two paths of alternating current voltage signals, modulating the components to obtain PWM waves, isolating and outputting the PWM waves, and then modulating and demodulating the PWM waves to obtain alternating current high voltage signals.
Further: the second voltage acquisition circuit comprises nine resistors connected in series, the resistors are connected into the A phase of the three-phase alternating current circuit, each resistor is 2M omega, and the output ends of the nine resistors connected in series are connected with the input end of the signal processing module.
Further: the third voltage acquisition circuit comprises nine resistors connected in series, the nine resistors are connected to the C phase of the three-phase alternating current circuit, each resistor is 2M omega, and the output ends of the nine resistors connected in series are connected with the input end of the signal processing module.
Further: the first voltage acquisition circuit comprises 20 series resistors, and each resistor is 51K and 2M omega; the 20 series resistors are connected in series at the rear end in sequence and are connected in series with a resistor R138 and a resistor R140, the resistor R138 is connected in parallel with a resistor R139, the resistor R140 is connected in parallel with a resistor R141, and one end of the resistor R140 and a reference ground are both connected with the input end of the shaping module.
Further: the shaping module comprises a one-way isolation transformer, a shaping chip and a low-pass filtering module which are sequentially connected.
Further: the output end of the unidirectional isolation transformer is connected with the input end of the shaping chip, the output end of the shaping chip is connected with the low-pass filtering module, and the low-pass filtering module comprises a filtering capacitor C102, a filtering capacitor C103, a voltage stabilizing diode D102 and a voltage stabilizing diode D103 which are connected in parallel.
Further: the signal processing module comprises a pulse width modulation module and a signal isolation output module, the pulse width modulation module comprises a signal preprocessing circuit and a PWM (pulse width modulation) circuit, and the PWM circuit adopts a pulse width modulation chip; the signal isolation output module comprises an optical fiber isolation sending end, the input of the optical fiber isolation sending end is connected with the PWM wave signal output by the pulse width modulation chip, and the other end of the optical fiber isolation sending end is connected with the optical fiber sending signal.
Further: the signal preprocessing circuit comprises a resistor R203, a resistor R204, a resistor R205, a resistor R206, a resistor R207, a capacitor C203, a voltage stabilizing diode D201 and a voltage stabilizing diode D202, wherein one end of the resistor R203, one end of the resistor R204 and one end of the voltage stabilizing diode D201 are connected with the output end of the second voltage acquisition circuit and the output end of the third voltage acquisition circuit in a terminating mode; the other end of the resistor R203, the other end of the resistor R204 and the other end of the voltage stabilizing diode D201 are connected with a voltage input end of the pulse width modulation chip; one end of the resistor R205, one end of the resistor R206, one end of the resistor R207, one end of the capacitor C203 and one end of the voltage stabilizing diode D202 are connected with the voltage input end of the pulse width modulation chip, and the other end of the pulse width modulation chip is connected with the reference ground.
Further: the PWM circuit is connected with an oscillating circuit, the oscillating circuit comprises a resistor R208 and a capacitor C204, one end of the resistor R208 is connected with an RT end of the PWM chip, one end of the capacitor C204 is connected with a CT end of the PWM chip, and the other end of the capacitor C204 and the other end of the resistor R208 are connected with a reference ground.
A high voltage detection method based on an alternating current high voltage detection device comprises the following steps:
step 1), taking one phase circuit in a three-phase alternating current circuit as a reference ground, respectively acquiring two alternating current voltage signals of the other phase circuit and an alternating current voltage signal of a third phase circuit, carrying out shaping filtering processing on the voltage signal acquired by the other phase circuit to obtain a direct current voltage signal, and then decomposing the direct current voltage signal into two paths of direct current components;
and step 2), the rest two paths of alternating current signals are respectively superposed with one path of direct current components and then modulated to obtain PWM waves with a certain duty ratio, and finally the PWM waves are modulated and demodulated to obtain a voltage value to be detected, so that voltage detection is completed.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to an alternating current high voltage detection device for a medium and high voltage soft starter, which comprises a voltage sampling module, a shaping module and a signal processing module, wherein the shaping module and the signal processing module are connected with the voltage sampling module; converting the voltage signal transmitted by the shaping module into two paths of direct current components by using a signal processing module, and superposing the two paths of direct current components with the other two paths of alternating current voltage signals to obtain a PWM wave with a certain pulse width; and finally, the transmitting end of the signal isolation output module is used for transmitting the signal isolation output module into a rear-stage circuit, and the rear-stage circuit is used for modulating and demodulating the PWM wave, so that the voltage detection of the medium-high voltage soft starter can be realized. The invention has higher safety, high detection result precision and strong anti-interference capability.
Furthermore, a single-phase isolation transformer is adopted to isolate voltage, so that the primary input side and the secondary output side can be effectively and electrically isolated, and the safety is improved.
Furthermore, a pulse width modulation chip for power supply is superposed on the sampled alternating voltage signal after being subjected to resistance voltage division, and generates a PWM wave with a certain pulse width after being modulated with a triangular wave generated by an oscillating circuit. And the pulse width modulation chip is used for PWM wave modulation, so that the voltage detection precision is improved.
Furthermore, the signal isolation output circuit is characterized in that the PWM wave signal output by the pulse width modulation chip is sent to the post-stage circuit by the optical fiber isolation sending end, and the optical fiber transmission can effectively improve the signal anti-interference performance, enhance the transmission reliability and enable the voltage value detection demodulated by the post-stage circuit to be more reliable.
Furthermore, because a plurality of resistors are connected in series, and a regulating resistor is arranged, the voltage measurement precision is improved, the risk of overlarge current when only one resistor is short-circuited is also avoided, meanwhile, a single-phase isolation transformer is adopted to electrically isolate a primary input side from a secondary output side, the safety and the reliability are higher, on the other hand, a signal processing module is additionally arranged, the sampled voltage signal is subjected to PWM modulation and signal isolation, and then is conveyed to a rear-stage demodulation circuit through an optical fiber isolation transmitting end, the signal precision is high, the signal interference is avoided, and the safety is improved.
Drawings
Fig. 1 is a schematic structural diagram of the general principle in the embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a voltage sampling module according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a shaping module according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a signal processing module according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, an ac high voltage detection apparatus for a medium-high voltage soft starter includes a voltage sampling module, and a shaping module and a signal processing module connected to the voltage sampling module;
the voltage sampling module comprises a first voltage acquisition circuit, a second voltage acquisition circuit and a third voltage acquisition circuit, the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit all use the A phase of the three-phase alternating current circuit as a reference ground, the first voltage acquisition circuit is connected in series between the A phase and the B phase of the three-phase alternating current circuit, and the acquired voltage signals are transmitted to the shaping module; the second voltage acquisition circuit is connected in series between the phase A and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module; the third voltage acquisition circuit is connected in series between the phase C and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module;
the shaping module is used for carrying out shaping filtering processing on the received voltage signal and then transmitting the voltage signal to the signal processing module as a power supply voltage;
the signal processing module is used for converting the voltage signals transmitted by the shaping module into two paths of direct current components, respectively superposing the two paths of direct current components with the other two paths of alternating current voltage signals, modulating the components to obtain PWM waves, isolating and outputting the PWM waves, and then modulating and demodulating the PWM waves to obtain alternating current high voltage signals.
Specifically, as shown in fig. 2, the second voltage acquisition circuit includes nine resistors connected in series to the a phase of the three-phase ac circuit, each resistor is 2M Ω, specifically, resistors (R101, R102, R103, R104, R105, R106, R107, R108, and R109) are used, the B phase of the three-phase ac circuit is used as a reference ground, the a-phase input ac voltage is connected to 9 resistors, and the divided ac voltage is connected to the input pin (pin 2) of the pulse width modulation module; the third voltage acquisition circuit comprises nine resistors connected in series to be connected into a C phase of the three-phase alternating current circuit, each resistor is 2M omega, specifically, resistors (R110, R111, R112, R113, R114, R115, R116, R117 and R118) are adopted, a B phase of the three-phase alternating current circuit is used as a reference ground, C-phase input alternating current voltage of the three-phase alternating current circuit is connected with 9 resistors, and low-voltage alternating current voltage after voltage division is connected with an input pin (pin 2) of the pulse width modulation module. The first voltage acquisition circuit comprises 20 series resistors, and each resistor is 51K and 2M omega; as shown in fig. 2, resistors (R119, R120, R121, R122, R123, R124, R125, R126, R127, R128, R129, R130, R131, R132, R133, R134, R135, R136, R137, R138) are connected in series, 20 series resistors are connected in series, and the rear ends of the series resistors are sequentially connected in series with a resistor R138 and a resistor R140, the resistor R138 is connected in parallel with a resistor R139, the resistor R140 is connected in parallel with a resistor R141, one end of the resistor R140 is connected with one input end of the unidirectional isolation transformer, and the other input end of the unidirectional isolation transformer is connected with reference; referring to fig. 2, one end of the resistor R140 is connected to pin 1 at the input end of the unidirectional isolation transformer, and the ground is connected to pin 2 at the input end of the isolation transformer.
As shown in fig. 3, the shaping module includes a unidirectional isolation transformer, a shaping chip and a low-pass filtering module, which are connected in sequence, in this application, AC 380V voltage is input to the input side of the unidirectional isolation transformer, AC 10V voltage is output from the output side, pins 3 and 4 at the output side of the isolation transformer are respectively connected to AC input pins of the shaping chip, output direct current voltage V +, V-output end of the shaping chip is connected to the low-pass filtering module, the low-pass filtering module includes a parallel filtering capacitor C102, a filtering capacitor C103, a zener diode D102 and a zener diode D103, the output V-side is grounded, and direct current voltage DC 10V generated at the output V + side supplies power to the signal processing module.
As shown in fig. 4, the signal processing module includes a pulse width modulation module and a signal isolation output module, the pulse width modulation module includes a signal preprocessing circuit and a PWM pulse width modulation circuit, and the PWM pulse width modulation circuit adopts a pulse width modulation chip U201; the signal preprocessing circuit comprises a resistor R203, a resistor R204, a resistor R205, a resistor R206, a resistor R207, a capacitor C203, a voltage stabilizing diode D201 and a voltage stabilizing diode D202, wherein one end of the resistor R203, one end of the resistor R204 and one end of the voltage stabilizing diode D201 are connected with the output end (VREF-A) of the second voltage acquisition circuit and the output end (VREF-C) of the third voltage acquisition circuit in a terminating mode; the other end of the resistor R203, the other end of the resistor R204 and the other end of the voltage stabilizing diode D201 are connected with an input signal pin 2 of the pulse width modulation chip; one end of the resistor R205, one end of the resistor R206, one end of the resistor R207, one end of the capacitor C203 and one end of the zener diode D202 are connected to the input signal pin 2 of the PWM chip, and the other end are connected to the reference ground. DC 5V is divided into two paths of direct current components by a resistor R203, a resistor R204, a resistor R205, a resistor R206 and a resistor R207, and the two paths of direct current components are superposed on two paths of alternating current input signals and are sent to a 2 pin of a pulse width modulation chip; the PWM circuit is connected with an oscillator circuit, the oscillator circuit comprises a resistor R208 and a capacitor C204, one end of the resistor R208 is connected with an RT end (6 pin) of a pulse width modulation chip, one end of the capacitor C204 is connected with a CT end (7 pin) of the pulse width modulation chip, the other end of the capacitor C204 and the other end of the resistor R208 are connected with a reference ground to generate a triangular wave with a certain frequency, DC 5V is divided into two paths of direct current components through a resistor R203, a resistor R204, a resistor R205 and a resistor R206, and the resistor R207 is superposed on two paths of alternating current input signals and then modulated with the triangular wave to generate the PWM wave with a certain duty ratio.
The signal isolation output module comprises an optical fiber isolation transmitting end U202, the input of the optical fiber isolation transmitting end U202 is connected with a PWM wave signal output by a pulse width modulation chip, the other end of the optical fiber isolation transmitting end U202 is connected with an optical fiber transmitting signal, the PWM wave with a certain duty ratio passing through the pulse width modulation chip is sent to a post-stage processing circuit through the optical fiber transmitting end, signal isolation is achieved, anti-interference performance is improved, and a subsequent processing circuit is used for carrying out modulation and demodulation to obtain a corresponding voltage signal.
The high-voltage detection method based on the voltage detection device comprises the following steps:
step 1), injecting an alternating current signal into an isolation transformer, shaping and filtering the alternating current signal, and sending a direct current voltage signal to a pulse width modulation chip for power supply;
step 2), superposing direct current components of the two collected paths of alternating current signals and sending the superposed direct current components to a pulse width modulation chip for processing;
and 3) the direct current voltage after shaping and filtering is sent to a pulse width modulation chip for power supply, the DC 10V is converted into DC 5V through the pulse width modulation chip, the DC 5V is converted into a required direct current component through resistance voltage division and is superposed on the two collected alternating current signals, the direct current component is modulated with a triangular wave with a certain frequency generated by a peripheral oscillation circuit of the pulse width modulation chip to obtain a PWM wave with a certain pulse width, finally, the PWM wave is sent to a rear-stage circuit through an optical fiber isolation sending end, a voltage value to be detected can be obtained through demodulation of the rear-stage circuit, and voltage detection is completed.
According to the method, alternating-current voltage is sequentially output through a voltage sampling module, a shaping module and a signal processing module, the phase B of a three-phase alternating-current circuit is used as a reference ground, the phase A of the three-phase alternating-current circuit is subjected to voltage division through a high-voltage sampling resistor and then input into a single-phase isolation transformer of the shaping module, low-voltage alternating-current signals are output through isolation and subjected to shaping and filtering processing to form direct-current voltage, the direct-current voltage signals are sent to a pulse width modulation module for power supply, meanwhile, the direct-current voltage DC 10V is converted into output voltage DC 5V through the pulse width modulation module, and the output voltage DC 5V is converted into two paths of direct; taking the phase B of the three-phase alternating current circuit as a reference ground, dividing the phase A of the three-phase alternating current circuit and the phase C of the three-phase alternating current circuit by using a high-voltage sampling resistor, superposing the two collected alternating voltage signals and two direct current components, and inputting the superposed signals into an input pin of a pulse width modulation module; then, the pulse width modulation module modulates the triangular wave generated by an oscillating circuit of the pulse width modulation module to obtain a PWM wave with a certain pulse width; and finally, the transmitting end of the signal isolation output module is used for transmitting the signal isolation output module into a rear-stage circuit, and the rear-stage circuit is used for modulating and demodulating the PWM wave, so that the voltage detection of the medium-high voltage soft starter can be realized. The pulse width modulation module adopts a pulse width modulation chip. The invention realizes the voltage detection function by utilizing the modulation and demodulation of the PWM wave, has high signal detection precision, avoids the interference between signals, can realize signal isolation and improves the safety.
Claims (10)
1. An alternating current high voltage detection device for a medium-high voltage soft starter is characterized by comprising a voltage sampling module, a shaping module and a signal processing module, wherein the shaping module and the signal processing module are connected with the voltage sampling module;
the voltage sampling module comprises a first voltage acquisition circuit, a second voltage acquisition circuit and a third voltage acquisition circuit, the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit all use the A phase of the three-phase alternating current circuit as a reference ground, the first voltage acquisition circuit is connected in series between the A phase and the B phase of the three-phase alternating current circuit, and the acquired voltage signals are transmitted to the shaping module; the second voltage acquisition circuit is connected in series between the phase A and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module; the third voltage acquisition circuit is connected in series between the phase C and the phase B of the three-phase alternating current circuit, and transmits the acquired alternating current voltage signal to the signal processing module;
the shaping module is used for carrying out shaping filtering processing on the received voltage signal and then transmitting the voltage signal to the signal processing module as a power supply voltage;
the signal processing module is used for converting the voltage signals transmitted by the shaping module into two paths of direct current components, respectively superposing the two paths of direct current components with the other two paths of alternating current voltage signals, modulating the components to obtain PWM waves, isolating and outputting the PWM waves, and then modulating and demodulating the PWM waves to obtain alternating current high voltage signals.
2. The ac high voltage detection device for a medium-high voltage soft starter according to claim 1, characterized in that: the second voltage acquisition circuit comprises nine resistors connected in series, the resistors are connected into the A phase of the three-phase alternating current circuit, each resistor is 2M omega, and the output ends of the nine resistors connected in series are connected with the input end of the signal processing module.
3. The ac high voltage detection device for a medium-high voltage soft starter according to claim 1, characterized in that: the third voltage acquisition circuit comprises nine resistors connected in series, the nine resistors are connected to the C phase of the three-phase alternating current circuit, each resistor is 2M omega, and the output ends of the nine resistors connected in series are connected with the input end of the signal processing module.
4. The ac high voltage detection device for a medium-high voltage soft starter according to claim 1, characterized in that: the first voltage acquisition circuit comprises 20 series resistors, and each resistor is 51K and 2M omega; the 20 series resistors are connected in series at the rear end in sequence and are connected in series with a resistor R138 and a resistor R140, the resistor R138 is connected in parallel with a resistor R139, the resistor R140 is connected in parallel with a resistor R141, and one end of the resistor R140 and a reference ground are both connected with the input end of the shaping module.
5. The ac high voltage detection device for a medium-high voltage soft starter according to claim 1, characterized in that: the shaping module comprises a one-way isolation transformer, a shaping chip and a low-pass filtering module which are sequentially connected.
6. The ac high voltage detection device for a medium-high voltage soft starter according to claim 5, characterized in that: the output end of the unidirectional isolation transformer is connected with the input end of the shaping chip, the output end of the shaping chip is connected with the low-pass filtering module, and the low-pass filtering module comprises a filtering capacitor C102, a filtering capacitor C103, a voltage stabilizing diode D102 and a voltage stabilizing diode D103 which are connected in parallel.
7. The ac high voltage detection device for a medium-high voltage soft starter according to claim 1, characterized in that: the signal processing module comprises a pulse width modulation module and a signal isolation output module, the pulse width modulation module comprises a signal preprocessing circuit and a PWM (pulse width modulation) circuit, and the PWM circuit adopts a pulse width modulation chip; the signal isolation output module comprises an optical fiber isolation sending end, the input of the optical fiber isolation sending end is connected with the PWM wave signal output by the pulse width modulation chip, and the other end of the optical fiber isolation sending end is connected with the optical fiber sending signal.
8. The ac high voltage detecting device for the medium-high voltage soft starter according to claim 7, characterized in that: the signal preprocessing circuit comprises a resistor R203, a resistor R204, a resistor R205, a resistor R206, a resistor R207, a capacitor C203, a voltage stabilizing diode D201 and a voltage stabilizing diode D202, wherein one end of the resistor R203, one end of the resistor R204 and one end of the voltage stabilizing diode D201 are connected with the output end of the second voltage acquisition circuit and the output end of the third voltage acquisition circuit in a terminating mode; the other end of the resistor R203, the other end of the resistor R204 and the other end of the voltage stabilizing diode D201 are connected with a voltage input end of the pulse width modulation chip; one end of the resistor R205, one end of the resistor R206, one end of the resistor R207, one end of the capacitor C203 and one end of the voltage stabilizing diode D202 are connected with the voltage input end of the pulse width modulation chip, and the other end of the pulse width modulation chip is connected with the reference ground.
9. The ac high voltage detecting device for the medium-high voltage soft starter according to claim 7, characterized in that: the PWM circuit is connected with an oscillating circuit, the oscillating circuit comprises a resistor R208 and a capacitor C204, one end of the resistor R208 is connected with an RT end of the PWM chip, one end of the capacitor C204 is connected with a CT end of the PWM chip, and the other end of the capacitor C204 and the other end of the resistor R208 are connected with a reference ground.
10. A high voltage detection method based on the ac high voltage detection device of claim 1, comprising the steps of:
step 1), taking one phase circuit in a three-phase alternating current circuit as a reference ground, respectively acquiring two alternating current voltage signals of the other phase circuit and an alternating current voltage signal of a third phase circuit, carrying out shaping filtering processing on the voltage signal acquired by the other phase circuit to obtain a direct current voltage signal, and then decomposing the direct current voltage signal into two paths of direct current components;
and step 2), the rest two paths of alternating current signals are respectively superposed with one path of direct current components and then modulated to obtain PWM waves with a certain duty ratio, and finally the PWM waves are modulated and demodulated to obtain a voltage value to be detected, so that voltage detection is completed.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996005686A1 (en) * | 1994-08-10 | 1996-02-22 | Cp Clare Corporation | Bilateral switch for modem applications |
| DE19542392A1 (en) * | 1994-11-18 | 1996-05-30 | Sharp Kk | HV power supply e.g. for photocopier or printer |
| CN1502996A (en) * | 2002-11-20 | 2004-06-09 | 伟 吴 | Detection isolation and transmission device for voltage and current signal |
| US6885184B1 (en) * | 2004-03-31 | 2005-04-26 | Asco Power Technologies, L.P. | Galvanically isolated voltage sensing circuit |
| JP2012117929A (en) * | 2010-12-01 | 2012-06-21 | Mitsubishi Electric Corp | Voltage detection device |
| CN202404140U (en) * | 2011-12-18 | 2012-08-29 | 哈尔滨九洲电气股份有限公司 | 10 KV voltage isolation collection device based on APLC-C784 |
| CN103245817A (en) * | 2013-04-03 | 2013-08-14 | 易能乾元（北京）电力科技有限公司 | Voltage measuring method and voltage transducer |
| CN106505882A (en) * | 2016-12-12 | 2017-03-15 | 盐城工学院 | A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply |
| CN207752063U (en) * | 2018-01-30 | 2018-08-21 | 武汉征原电气有限公司 | A kind of isolation voltage sensor |
| CN108519508A (en) * | 2018-03-16 | 2018-09-11 | 华中科技大学 | A kind of comparator measuring exchange and DC current |
| CN110836998A (en) * | 2020-01-09 | 2020-02-25 | 宁波中车时代传感技术有限公司 | Voltage sensor circuit |
-
2020
- 2020-12-30 CN CN202011627041.5A patent/CN112816760A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996005686A1 (en) * | 1994-08-10 | 1996-02-22 | Cp Clare Corporation | Bilateral switch for modem applications |
| DE19542392A1 (en) * | 1994-11-18 | 1996-05-30 | Sharp Kk | HV power supply e.g. for photocopier or printer |
| US5715149A (en) * | 1994-11-18 | 1998-02-03 | Sharp Kabushiki Kaisha | High-voltage power pack |
| CN1502996A (en) * | 2002-11-20 | 2004-06-09 | 伟 吴 | Detection isolation and transmission device for voltage and current signal |
| US6885184B1 (en) * | 2004-03-31 | 2005-04-26 | Asco Power Technologies, L.P. | Galvanically isolated voltage sensing circuit |
| JP2012117929A (en) * | 2010-12-01 | 2012-06-21 | Mitsubishi Electric Corp | Voltage detection device |
| CN202404140U (en) * | 2011-12-18 | 2012-08-29 | 哈尔滨九洲电气股份有限公司 | 10 KV voltage isolation collection device based on APLC-C784 |
| CN103245817A (en) * | 2013-04-03 | 2013-08-14 | 易能乾元（北京）电力科技有限公司 | Voltage measuring method and voltage transducer |
| CN106505882A (en) * | 2016-12-12 | 2017-03-15 | 盐城工学院 | A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply |
| CN207752063U (en) * | 2018-01-30 | 2018-08-21 | 武汉征原电气有限公司 | A kind of isolation voltage sensor |
| CN108519508A (en) * | 2018-03-16 | 2018-09-11 | 华中科技大学 | A kind of comparator measuring exchange and DC current |
| CN110836998A (en) * | 2020-01-09 | 2020-02-25 | 宁波中车时代传感技术有限公司 | Voltage sensor circuit |
Non-Patent Citations (2)
| Title |
|---|
| 白杰;: "电力电子变压器的应用研究", 电工电气, no. 11, 15 November 2009 (2009-11-15) * |
| 陈挺: "运算放大器在直流测量中的应用", 电测与仪表, no. 07, 10 July 1974 (1974-07-10) * |
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