CN109617011B - high-voltage direct-current solid-state relay circuit with leakage protection - Google Patents
high-voltage direct-current solid-state relay circuit with leakage protection Download PDFInfo
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- CN109617011B CN109617011B CN201811444609.2A CN201811444609A CN109617011B CN 109617011 B CN109617011 B CN 109617011B CN 201811444609 A CN201811444609 A CN 201811444609A CN 109617011 B CN109617011 B CN 109617011B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Abstract
The invention relates to high-voltage direct-current solid-state relay circuits with leakage protection, which are suitable for application occasions requiring high-voltage direct-current power supply with leakage protection function or contactless switch control in a driving circuit, wherein the circuit comprises an optical isolation type direct-current IGBT (insulated gate bipolar transistor) switching circuit and a direct-current leakage measurement and control circuit, and specifically comprises an optocoupler IC1, a comparator IC2, a residual current sensor SC1, a driving triode VT1, a constant-current triode VT2, an IGBT VT3, a thyristor VT4, a voltage stabilizing tube DW1, a diode D1, a voltage stabilizing capacitor C1, a protective capacitor C2, a driving resistor R1, a constant-current resistor R2 and the like.
Description
Technical Field
The invention belongs to the field of industrial measurement and control, relates to circuits, in particular to high-voltage direct-current solid-state relay circuits with leakage protection, and is suitable for application occasions requiring contactless switch control in a high-voltage direct-current power supply or driving circuit with a leakage protection function.
Background
The contactless solid-state relay has the advantages of no mechanical contact, quick response, long service life and the like, so that the contactless solid-state relay is increasingly applied to , especially in a high-voltage direct-current power supply and driving circuit, the requirement on leakage protection is higher, safety protection can be timely carried out when direct-current leakage occurs so as to avoid personal safety accidents, and the requirement on the real-time performance of protection action is high.
Disclosure of Invention
The invention aims to provide high-voltage direct-current solid-state relay circuits with leakage protection, aiming at the defects in the prior art, the circuit consists of a light-blocking direct-current IGBT driving circuit and a direct-current leakage measurement and control circuit, the core of the circuit is that IGBTs are used as power control devices, a leakage current sensor is configured, a reverse-resistance type thyristor is used as a protection control device, and the circuit can be reliably turned off and protected when leakage occurs.
The circuit comprises an optical isolation type direct current IGBT driving circuit and a direct current electric leakage measurement and control circuit.
The light-isolation type direct current IGBT switching circuit comprises an optocoupler IC, a driving triode VT, a constant current triode VT, an IGBT tube VT, a voltage stabilizing tube DW, a voltage stabilizing capacitor C, a protection capacitor C, a driving resistor R, a constant current resistor R, an upper voltage-dividing resistor R, a lower voltage-dividing resistor R, a voltage stabilizing resistor R, a protection resistor R and a Load, wherein a positive driving end IN + is connected with the end of the driving resistor R and the anode of a light-emitting tube of the optocoupler IC, the other end of the driving resistor R is connected with the base electrode of the driving triode VT and the collector electrode of the constant current triode VT, the cathode of the light-dividing resistor R is connected with the collector electrode of the driving triode VT, the emitter electrode of the driving triode VT is connected with the base electrode of the constant current triode VT and the 0 end of the constant current resistor R, the other 1 end of the constant current resistor R is connected with the emitter of the constant current triode VT and the negative driving end IN-end, the output collector electrode of the optocoupler IC is connected with the ends of a voltage-stabilizing resistor R2 end, the cathode of the voltage-stabilizing tube DW, the end of the constant current-dividing resistor R, the 3 end of the voltage-dividing resistor R, the auxiliary voltage-dividing resistor R + E end of the voltage-dividing resistor R, the voltage-dividing resistor R is connected with the cathode of the diode D, the anode of the Load, the drain of the Load, the Load-dividing resistor R and the drain of the Load, the diode D are connected with the drain of the diode D, the Load, the drain of the Load, the Load is connected with the Load, the drain of the Load, the Load;
the direct current leakage measurement and control circuit comprises a residual current sensor SC, a comparator IC, a thyristor VT, an electrode resistor R, a hysteresis resistor R, a pull-up resistor R, a filter resistor R, a positive terminal resistor R, a negative terminal resistor R, an upper bias resistor R, a lower bias resistor R and a filter capacitor C, wherein a power supply terminal VCC end of the residual current sensor SC is connected with an auxiliary power supply terminal + E end, a ground terminal GND end of the current sensor SC is grounded, an output terminal OUT end of the current sensor SC is connected with an end of the filter resistor R, the other 0 end of the filter resistor R is connected with an end 1 of the filter capacitor C and an end 3 of the positive terminal resistor R, the other 5 end of the filter capacitor C is grounded, the other 6 end of the positive terminal resistor R is connected with an end 7 of the hysteresis resistor R and an end I + end of the comparator IC, the other 8 end of the filter resistor R is connected with an output terminal OUT end of the comparator IC, an end 9 end of the 2 electrode resistor R and an end of the pull-up resistor R, the other 0 end of the positive terminal resistor R is connected with an end of the comparator IC, the other end 0 end of the comparator R is connected with an electrode of the comparator IC, the negative terminal R + E end of the comparator IC, the ground terminal R is connected with an end of the auxiliary power supply terminal R, the negative terminal of the comparator IC is connected with an end of the comparator IC, the negative terminal R + E terminal of the.
The invention has the following beneficial effects:
the invention adopts a simple circuit scheme which mainly comprises an IBGT tube, a reverse-resistance type thyristor, a residual current sensor, a voltage comparator and the like, and can completely meet the requirement of reliable real-time protection on leakage current faults in a high-voltage direct-current solid-state relay circuit. The circuit is simple, low in cost, high in reliability, good in universality and easy to produce.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures.
As shown in FIG. 1, high-voltage direct-current solid-state relay circuits with leakage protection comprise an optical isolation type direct-current IGBT driving circuit and a direct-current leakage measurement and control circuit.
The light-isolation type direct current IGBT switching circuit comprises an optocoupler IC, a driving triode VT, a constant current triode VT, an IGBT tube VT, a voltage stabilizing tube DW, a voltage stabilizing capacitor C, a protection capacitor C, a driving resistor R, a constant current resistor R, an upper voltage-dividing resistor R, a lower voltage-dividing resistor R, a voltage stabilizing resistor R, a protection resistor R and a Load, wherein a positive driving end IN + is connected with the end of the driving resistor R and the anode of a light-emitting tube of the optocoupler IC, the other end of the driving resistor R is connected with the base electrode of the driving triode VT and the collector electrode of the constant current triode VT, the cathode of the light-dividing resistor R is connected with the collector electrode of the driving triode VT, the emitter electrode of the driving triode VT is connected with the base electrode of the constant current triode VT and the 0 end of the constant current resistor R, the other 1 end of the constant current resistor R is connected with the emitter of the constant current triode VT and the negative driving end IN-end, the output collector electrode of the optocoupler IC is connected with the ends of a voltage-stabilizing resistor R2 end, the cathode of the voltage-stabilizing tube DW, the end of the constant current-dividing resistor R, the 3 end of the voltage-dividing resistor R, the auxiliary voltage-dividing resistor R + E end of the voltage-dividing resistor R, the voltage-dividing resistor R is connected with the cathode of the diode D, the anode of the Load, the drain of the Load, the Load-dividing resistor R and the drain of the Load, the diode D are connected with the drain of the diode D, the Load, the drain of the Load, the Load is connected with the Load, the drain of the Load, the Load;
the direct current leakage measurement and control circuit comprises a residual current sensor SC, a comparator IC, a thyristor VT, an electrode resistor R, a hysteresis resistor R, a pull-up resistor R, a filter resistor R, a positive terminal resistor R, a negative terminal resistor R, an upper bias resistor R, a lower bias resistor R and a filter capacitor C, wherein a power supply terminal VCC end of the residual current sensor SC is connected with an auxiliary power supply terminal + E end, a ground terminal GND end of the current sensor SC is grounded, an output terminal OUT end of the current sensor SC is connected with an end of the filter resistor R, the other 0 end of the filter resistor R is connected with an end 1 of the filter capacitor C and an end 3 of the positive terminal resistor R, the other 5 end of the filter capacitor C is grounded, the other 6 end of the positive terminal resistor R is connected with an end 7 of the hysteresis resistor R and an end I + end of the comparator IC, the other 8 end of the filter resistor R is connected with an output terminal OUT end of the comparator IC, an end 9 end of the 2 electrode resistor R and an end of the pull-up resistor R, the other 0 end of the positive terminal resistor R is connected with an end of the comparator IC, the other end 0 end of the comparator R is connected with an electrode of the comparator IC, the negative terminal R + E end of the comparator IC, the ground terminal R is connected with an end of the auxiliary power supply terminal R, the negative terminal of the comparator IC is connected with an end of the comparator IC, the negative terminal R + E terminal of the.
All devices used by the invention, including the optocoupler IC1, the comparator IC2, the driving triode VT1, the constant current triode VT2, the IBGT tube VT3, the thyristor VT4, the residual current sensor SC1 and the like, are existing mature products and can be obtained through the market. For example: the opto-coupler adopts 6N136, the comparator adopts LM311, the triode adopts C9014, the IBGT pipe adopts IRG series IBGT pipe, the thyristor adopts KK1-2 fast thyristor, the residual current sensor adopts AHKC series current sensor, etc.
The main circuit parameters in the invention are matched as follows:
setting: the output signal of the residual current sensor SC1 is ui＝ui0+kiI0，ui0、uimRespectively, a zero current signal and an allowable maximum output signal (unit: V), I0、I0mIs the measured leakage current and its allowable maximum value (unit: A), kiIs a transform coefficient (unit: V/A), E1Is the auxiliary power voltage (unit: V), and the current of the light-emitting side of the optical coupler is IF(unit: A).
In the formula2Is the resistance value (unit: omega) of a constant current resistor R28、R10、R11、R13、R14The resistance values (unit: omega) of the hysteresis resistor R8, the filter resistor R10, the positive end resistor R11, the upper bias resistor R13 and the lower bias resistor R14 are respectively.
The working process of the invention is as follows:
(1) the isolation drive control function on the direct current load: the circuit has a photoelectric isolation function, the light-emitting control side of the optocoupler IC1 is a constant current circuit driven by wide voltage, and the constant current circuit is driven according to the current I of the light-emitting sideFThe constant current resistor R2 is configured according to the formula (1), the positive driving end IN + of the circuit is connected with the positive end of the driving voltage, the negative driving end IN-is connected with the negative end of the driving voltage , the positive driving end IN + can be connected with the power supply voltage end of the superior control circuit, the negative driving end IN-end can be used as the switch control end of the superior control circuit, the control end is IN optical coupling conduction when the level is high, the IGBT tube is conducted to supply power to the load, the control end is IN optical coupling disconnection when the level is low, the IGBT tube is disconnected, and the load is disconnected, the driving control power supply of the IBGT is an auxiliary power supply which consists of a voltage stabilizing resistor R5, a voltage stabilizing tube WD1 and a voltage stabilizing capacitor C1, and the voltage of the auxiliary power supply is + E1.
(2) Leakage protection, namely monitoring leakage current in the circuit in real time by using a residual current sensor SC1, and finding that the current reaches an allowable maximum value I after DEG0mUnder the coordination of the circuit parameters of the formula (2) and the formula (3), the comparator IC2 outputs a high level to turn on the thyristor VT4, so that the IBGT tube is forced to be turned off, and the IBGT tube is always turned off before the power-off restart operation is not performed after the IBGT tube is turned off, thereby safely and reliably realizing the protection control function on the direct current leakage current.
Claims (2)
1, kind of high voltage direct current solid state relay circuit with earth leakage protection, including light isolated DC IGBT switch circuit, direct current electric leakage measurement and control circuit, its characterized in that:
the light-isolation type direct current IGBT switching circuit comprises an optocoupler IC, a driving triode VT, a constant current triode VT, an IGBT tube VT, a voltage stabilizing tube DW, a voltage stabilizing capacitor C, a protection capacitor C, a driving resistor R, a constant current resistor R, an upper voltage-dividing resistor R, a lower voltage-dividing resistor R, a voltage stabilizing resistor R, a protection resistor R and a Load, wherein a positive driving end IN + is connected with the end of the driving resistor R and the anode of a light-emitting tube of the optocoupler IC, the other end of the driving resistor R is connected with the base electrode of the driving triode VT and the collector electrode of the constant current triode VT, the cathode of the light-dividing resistor R is connected with the collector electrode of the driving triode VT, the emitter electrode of the driving triode VT is connected with the base electrode of the constant current triode VT and the 0 end of the constant current resistor R, the other 1 end of the constant current resistor R is connected with the emitter of the constant current triode VT and the negative driving end IN-end, the output collector electrode of the optocoupler IC is connected with the ends of a voltage-stabilizing resistor R2 end, the cathode of the voltage-stabilizing tube DW, the end of the constant current-dividing resistor R, the 3 end of the voltage-dividing resistor R, the auxiliary voltage-dividing resistor R + E end of the voltage-dividing resistor R, the voltage-dividing resistor R is connected with the cathode of the diode D, the anode of the Load, the drain of the Load, the Load-dividing resistor R and the drain of the Load, the diode D are connected with the drain of the diode D, the Load, the drain of the Load, the Load is connected with the Load, the drain of the Load, the Load;
the direct current leakage measurement and control circuit comprises a residual current sensor CS, a comparator IC, a thyristor VT, an electrode resistor R, a hysteresis resistor R, a pull-up resistor R, a filter resistor R, a positive terminal resistor R, a negative terminal resistor R, an upper bias resistor R, a lower bias resistor R and a filter capacitor C, wherein a power supply terminal VCC end of the residual current sensor CS is connected with an auxiliary power supply terminal + E end, a ground terminal GND end of the current sensor CS is grounded, an output terminal OUT end of the current sensor CS is connected with an end of the filter resistor R, the other 0 end of the filter resistor R is connected with an end 1 of the filter capacitor C and an end 3 of the positive terminal resistor R, the other 5 end of the filter capacitor C is grounded, the other 6 end of the positive terminal resistor R is connected with an end 7 of the hysteresis resistor R and an end I + end of the comparator IC, the other 8 end of the filter resistor R is connected with an output terminal OUT end of the comparator IC, an end 9 end of the 2 electrode resistor R and an end of the pull-up resistor R, the other 0 end of the resistor R is connected with an end of the comparator IC, the other end 0 end of the comparator R is connected with an electrode of the comparator IC, the negative terminal R-R is connected with an end of the comparator IC, the ground terminal R-R end of the auxiliary power supply terminal R, the auxiliary power supply terminal of the auxiliary power supply terminal R, the comparator IC is connected with an end of the ground terminal of the comparator IC, the negative terminal of the auxiliary power supply terminal R.
2. The high-voltage direct current solid-state relay circuit with earth leakage protection of claim 1, wherein the circuit parameters are as follows:
setting: the output signal of the residual current sensor CS1 is ui＝ui0+kiI0，ui0、uimRespectively a zero current signal and an allowed maximum output signal, I0、I0mFor the measured leakage current and its permissible maximum value, kiTo transform coefficients, E1The current on the light-emitting side of the optical coupler is I for assisting the power supply voltageF；
In the formula2Is the resistance value of a constant current resistor R28、R10、R11、R13、R14The resistance values of the hysteresis resistor R8, the filter resistor R10, the positive end resistor R11, the upper bias resistor R13 and the lower bias resistor R14 are respectively.
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| CN201811444609.2A CN109617011B (en) | 2018-11-29 | 2018-11-29 | high-voltage direct-current solid-state relay circuit with leakage protection |
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| CN201811444609.2A CN109617011B (en) | 2018-11-29 | 2018-11-29 | high-voltage direct-current solid-state relay circuit with leakage protection |
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| CN109617011B true CN109617011B (en) | 2020-01-31 |
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| CN111969984A (en) * | 2020-08-11 | 2020-11-20 | 浙江世菱电力电子有限公司 | Direct-current contactless solid-state relay |
| CN115951207B (en) * | 2022-12-24 | 2023-08-01 | 北京市科通电子继电器总厂有限公司 | Testing circuit and system of solid state relay |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623947A (en) * | 2012-03-29 | 2012-08-01 | 临安亿安电力电子科技有限公司 | Leakage protector with phase line switching function |
| CN103956708A (en) * | 2014-04-21 | 2014-07-30 | 杭州电子科技大学 | Overload measurement and control circuit for low-voltage direct current load |
| CN107294061A (en) * | 2017-06-26 | 2017-10-24 | 北京无线电测量研究所 | A kind of guard method of high voltage power supply electric leakage and device |
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| US20120069476A1 (en) * | 2010-08-10 | 2012-03-22 | Steve Fabian | Thermally protected resettable GFCI |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623947A (en) * | 2012-03-29 | 2012-08-01 | 临安亿安电力电子科技有限公司 | Leakage protector with phase line switching function |
| CN103956708A (en) * | 2014-04-21 | 2014-07-30 | 杭州电子科技大学 | Overload measurement and control circuit for low-voltage direct current load |
| CN107294061A (en) * | 2017-06-26 | 2017-10-24 | 北京无线电测量研究所 | A kind of guard method of high voltage power supply electric leakage and device |
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Effective date of registration: 20220112 Address after: 100071 805-1, 7 / F, 301, building 3-17, yard 1, Hangfeng Road, Fengtai District, Beijing Patentee after: Beijing Zhongzhi Zhongke Technology Development Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |