CN109273323B - Relay efficiency compensation circuit and system - Google Patents
Relay efficiency compensation circuit and system Download PDFInfo
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- CN109273323B CN109273323B CN201811420998.5A CN201811420998A CN109273323B CN 109273323 B CN109273323 B CN 109273323B CN 201811420998 A CN201811420998 A CN 201811420998A CN 109273323 B CN109273323 B CN 109273323B
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- 238000005070 sampling Methods 0.000 claims abstract description 57
- 239000003990 capacitor Substances 0.000 claims description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052710 silicon Inorganic materials 0.000 abstract description 12
- 239000010703 silicon Substances 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 2
- 239000003574 free electron Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 101000662518 Solanum tuberosum Sucrose synthase Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Amplifiers (AREA)
- Relay Circuits (AREA)
Abstract
The embodiment of the invention provides a relay efficiency compensation circuit and a system, comprising: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit. The zero-crossing sampling circuit is used for realizing zero-crossing instant switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the switching-on distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature between protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on, the silicon controlled rectifier is only switched on in the switching-off and switching-on instant of the circuit, the contacts are responsible for keeping normal conduction of the circuit after being put into operation, the silicon controlled rectifier immediately exits operation at the moment, the accurate zero-crossing instant switching is realized, the loss of not only electric energy is minimum, and the performance of the relay is the most stable and the most reliable.
Description
Technical Field
The invention relates to the field of circuits, in particular to a relay efficiency compensation circuit and a relay efficiency compensation system.
Background
Along with the great deal of applications of computer lamps and LED lamps in the lighting industry of performance equipment, relays are used for controlling the power supply of the lighting equipment in a most main control mode. However, in the switch state of the relay, due to the discharge phenomenon of free gas with strong and durable high-temperature conductivity generated between the contacts, when the contacts of the relay are separated, electrons on the surfaces of the contacts are pulled out by electric field force to form free electrons, the free electrons and the original few electrons between the original contacts are continuously collided and dissociated, so that the contacts are filled with electrons and positive ions, and under the applied voltage, air is broken down to generate electric sparks, at the moment, the contacts of the relay can be burnt out to damage the switch, even the contacts cannot be broken by fusion welding, and malignant serious harm such as fire is caused.
Disclosure of Invention
The invention aims to provide a relay efficiency compensation circuit and a relay efficiency compensation system, which can solve the problems.
Embodiments of the present invention are implemented as follows:
in order to solve the above-described problems, the present invention provides a relay efficiency compensation circuit including: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit; the MPU main control circuit is respectively connected with the relay driving circuit, the temperature sampling feedback circuit, the voltage and current sampling analysis circuit and the zero-crossing sampling circuit, and the efficiency compensation circuit is connected with the MPU main control circuit through the relay driving circuit; the zero-crossing sampling circuit is used for realizing zero-crossing instant switching of current and voltage.
In addition, the embodiment of the invention also provides a relay efficiency compensation system, which comprises a relay efficiency compensation circuit and a load, wherein the load is connected with the zero-crossing sampling circuit.
The embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a relay efficiency compensation circuit and a system, comprising: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit; the MPU main control circuit is respectively connected with the relay driving circuit, the temperature sampling feedback circuit, the voltage and current sampling analysis circuit and the zero-crossing sampling circuit, and the efficiency compensation circuit is connected with the MPU main control circuit through the relay driving circuit; the zero-crossing sampling circuit is used for realizing instantaneous switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the opening distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature between protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on and off, ensuring that the silicon controlled rectifier is only switched on at the moment of separation and closing of the circuit, keeping the normal conduction of the circuit after the contacts are charged, enabling the silicon controlled rectifier to immediately exit from running at the moment, accurately switching at the zero-crossing moment, minimizing the loss of non-single electric energy, and ensuring the most stable and reliable performance of the relay.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a relay efficiency compensation circuit according to a preferred embodiment of the present invention;
FIG. 2 is a circuit diagram of an MPU master circuit of the relay efficiency compensation circuit provided by the preferred embodiment of the present invention;
FIG. 3 is a circuit diagram of a relay driving circuit of the relay efficiency compensating circuit according to the preferred embodiment of the present invention;
FIG. 4 is a circuit diagram of an efficiency compensation circuit of the relay efficiency compensation circuit according to the preferred embodiment of the present invention;
FIG. 5 is a circuit diagram of a temperature sampling feedback circuit of the relay efficiency compensation circuit according to the preferred embodiment of the present invention;
FIG. 6 is a circuit diagram of a voltage-current sampling analysis circuit of the relay efficiency compensation circuit according to the preferred embodiment of the present invention;
FIG. 7 is a zero crossing sampling circuit of the relay efficiency compensation circuit provided by the preferred embodiment of the present invention;
fig. 8 is a block diagram of a relay efficiency compensating system according to a preferred embodiment of the present invention.
Icon: 100-relay efficiency compensation circuit; 110-MPU master control circuit; 120-an efficiency compensation circuit; 130-a relay driving circuit; 140-a temperature sampling feedback circuit; 150-a voltage and current sampling analysis circuit; 160-zero crossing sampling circuit; 200-relay efficiency compensation system; 210-load.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present embodiment provides a relay efficiency compensation circuit 100, which includes an MPU main control circuit 110, an efficiency compensation circuit 120, a relay driving circuit 130, a temperature sampling feedback circuit 140, a voltage and current sampling analysis circuit 150, and a zero-crossing sampling circuit 160.
The MPU main control circuit 110 is connected to the relay driving circuit 130, the temperature sampling feedback circuit 140, the voltage and current sampling analysis circuit 150, and the zero-crossing sampling circuit 160, and the efficiency compensation circuit 120 is connected to the MPU main control circuit 110 through the relay driving circuit 130.
The zero-crossing sampling circuit 160 is used for realizing zero-crossing instant switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the opening distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature among protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on, the silicon controlled rectifier is only conducted at the moment of switching-on and switching-off of the circuit, the contacts are responsible for keeping normal conduction of the circuit after being put into operation, the silicon controlled rectifier immediately exits operation at the moment, accurate zero-crossing instant switching is realized, the loss of not only electric energy is minimum, and the performance of the relay is the most stable and reliable.
Alternatively, referring to FIG. 2, the MPU master control circuit 110 may be a microcontroller of model LPC 1768.
Optionally, referring to fig. 3, the relay driving circuit 130 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1, a second triode Q2, and a first diode D1, where the first resistor R1 is connected to one end of the second resistor R2 by a power supply, the other end of the first resistor R1 is connected to an emitter of the first triode Q1, the other end of the second resistor R2 is connected to a base of the first triode Q1, one end of the third resistor R3 is connected to the MPU master control circuit, the other end is connected to a base of the first triode Q1, the fourth resistor R4 is connected between a collector of the first triode Q1 and a base of the second triode Q2, the fifth resistor R5 is connected between the base of the second triode Q2 and the emitter of the second triode Q1, and the forward conducting end of the first diode D1 is connected to a collector of the second triode Q2.
The resistance of the first resistor R1 may be 220 ohms, the resistance of the second resistor R2 may be 10K ohms, the resistance of the third resistor R3 may be 4.7K ohms, the resistance of the fourth resistor R4 may be 5.1K ohms, the resistance of the fifth resistor R5 may be 4.7K ohms, the type of the first transistor Q1 may be SS8550, and the type of the second transistor Q2 may be 5551.
Optionally, referring to fig. 4, the efficiency compensation circuit 120 includes a relay, a sixth resistor R6, a sliding rheostat R7, and a second capacitor C2, where one end of the sixth resistor R6 is connected to the voltage-current sampling analysis circuit, the other end is connected to the relay, one end of the second capacitor is connected between the sixth resistor R6 and the relay, the other end is connected to one end of the sliding rheostat R7, and the other end of the sliding rheostat R7 is connected to the relay.
The resistance of the sixth resistor R6 may be 1K ohms, the capacitance of the second capacitor C2 may be 0.1uF, and the resistance of the sliding resistor R7 may be 20K ohms.
Optionally, referring to fig. 5, the temperature sampling feedback circuit 140 includes a first amplifier U1, a zener diode Z1, and a first capacitor C1, where an output end of the first amplifier U1 is connected to the MPU main control circuit, an input end of the first amplifier U1 is connected to an output end of the first amplifier U1, another input end of the first amplifier U1 is connected to the relay, and the zener diode Z1 and the first capacitor C1 are respectively connected to another input end of the first amplifier U1.
The signal of the first amplifier may be LM258, the signal of the zener diode Z1 may be SS16, and the capacitance value of the first capacitor C1 may be 0.1uF.
Optionally, referring to fig. 6, the voltage-current sampling analysis circuit 150 includes: a temperature sensor, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, a first Schottky diode Q3, a second Schottky diode Q4 and an electric energy analyzer; the electric energy analyzer is connected with the MPU main control circuit, and is also connected with one end of a sixth resistor R6, a ninth resistor R9 and an eighth resistor R8 respectively, the other end of the eighth resistor R8 is also connected with one output end of the sensor, the other end of the ninth resistor R9 is respectively connected with a third capacitor C3 and a tenth resistor R10, one ends of a first Schottky diode Q3 and a second Schottky diode Q4 are respectively connected with the other end of the tenth resistor R10, the other ends of the first Schottky diode Q3 and the second Schottky diode Q4 are respectively connected with the third capacitor, and the second Schottky diode Q4 is also connected with the other output end of the sensor.
The resistance of the eighth resistor R8 may be 390 ohms, the resistance of the ninth resistor R9 may be 510 ohms, the resistance of the tenth resistor R10 may be 270 ohms, the capacitance of the third capacitor C3 may be 0.1uF, and the types of the first schottky diode Q3 and the second schottky diode Q4 may be BAT54SLT1.
Optionally, referring to fig. 7, the zero-cross sampling circuit 160 includes a fourth capacitor C4, a second diode D2, a second amplifier U2, an eleventh resistor R11, a twelfth resistor R12, a photocoupler, a thirteenth resistor R13, and a bridge; the output end of the second amplifier U2 is connected with the MPU main control circuit, the fourth capacitor C4 and the second diode D2 are connected in parallel and then connected in series between one input end and the output end of the second amplifier U2, the twelfth resistor R12 and the eleventh resistor R11 are connected between one input end of the second amplifier U2 and the photoelectric coupler, the thirteenth resistor R13 is connected between the photoelectric coupler and the bridge, and the bridge is also used for connecting loads.
The capacitance value of the fourth capacitor C4 may be 0.1uF, the model of the second diode D2 may be IN4148, the resistance value of the eleventh resistor R11 may be 10K ohms, the resistance value of the twelfth resistor R12 may be 390 ohms, the model of the photocoupler may be HCP2630, and the resistance value of the thirteenth resistor R13 may be 390 ohms.
Alternatively, the second amplifier U2 may have a model LM258.
Optionally, referring to fig. 8, an embodiment of the present invention further provides a relay efficiency compensation system 200, which includes the relay efficiency compensation circuit 100 according to any one of the first embodiment and a load 210, where the load is connected to the zero-crossing sampling circuit 100, for example, connected to a bridge of the zero-crossing sampling circuit.
The load is a non-resistive load. For example, a computer lamp, an LED lamp, a motor, etc. can be used.
In summary, the relay efficiency compensation circuit and the relay efficiency system provided by the embodiments of the present invention include: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit; the MPU main control circuit is respectively connected with the relay driving circuit, the temperature sampling feedback circuit, the voltage and current sampling analysis circuit and the zero-crossing sampling circuit, and the efficiency compensation circuit is connected with the MPU main control circuit through the relay driving circuit; the zero-crossing sampling circuit is used for realizing instantaneous switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the opening distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature between protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on and off, ensuring that the silicon controlled rectifier is only switched on at the moment of switching-on and off of the circuit, keeping the normal conduction of the circuit after the contacts are charged, immediately exiting the operation of the silicon controlled rectifier at the moment, accurately switching zero-crossing, having the least non-single electric energy loss, and the relay has the most stable and reliable performance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A relay efficiency compensation circuit, comprising: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit; the MPU main control circuit is respectively connected with the relay driving circuit, the temperature sampling feedback circuit, the voltage and current sampling analysis circuit and the zero-crossing sampling circuit, and the efficiency compensation circuit is connected with the MPU main control circuit through the relay driving circuit; the zero-crossing sampling circuit is used for realizing zero-crossing instant switching of current and voltage;
the MPU master control circuit comprises a microcontroller with the model number of LPC 1768;
the relay driving circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1, a second triode Q2 and a first diode D1, wherein one end of the first resistor R1 and one end of the second resistor R2 are connected with a power supply, the other end of the first resistor R1 is connected with an emitting electrode of the first triode Q1, the other end of the second resistor R2 is connected with a base electrode of the first triode Q1, one end of the third resistor R3 is connected with the MPU main control circuit, the other end of the third resistor R3 is connected with a base electrode of the first triode Q1, the fourth resistor R4 is connected between a collecting electrode of the first triode Q1 and a base electrode of the second triode Q2, the fifth resistor R5 is connected between the base electrode and the emitting electrode of the second triode Q2, and a forward conducting end of the first diode D1 is connected with a collector electrode of the second triode Q2;
the efficiency compensation circuit comprises a relay, a sixth resistor R6, a sliding rheostat R7 and a second capacitor C2, wherein one end of the sixth resistor R6 is connected with the voltage and current sampling analysis circuit, the other end of the sixth resistor R6 is connected with the relay, one end of the second capacitor is connected between the sixth resistor R6 and the relay, the other end of the second capacitor is connected with one end of the sliding rheostat R7, and the other end of the sliding rheostat R7 is connected with the relay; the resistance value of the sixth resistor R6 is 1 Kohm, the capacitance value of the second capacitor C2 is 0.1uF, and the resistance value of the sliding rheostat R7 is 20 Kohm;
the temperature sampling feedback circuit comprises a first amplifier U1, a zener diode Z1 and a first capacitor C1, wherein the output end of the first amplifier U1 is connected with the MPU main control circuit, one input end of the first amplifier U1 is connected with the output end of the first amplifier U1, the other input end of the first amplifier U1 is connected with the relay, and the zener diode Z1 and the first capacitor C1 are respectively connected with the other input end of the first amplifier U1;
the voltage and current sampling analysis circuit comprises: a temperature sensor, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, a first Schottky diode Q3, a second Schottky diode Q4 and an electric energy analyzer; the electric energy analyzer is connected with the MPU main control circuit, and is also connected with one ends of a sixth resistor R6, a ninth resistor R9 and an eighth resistor R8, the other end of the eighth resistor R8 is also connected with one output end of the sensor, the other end of the ninth resistor R9 is respectively connected with a third capacitor C3 and a tenth resistor R10, one ends of a first Schottky diode Q3 and a second Schottky diode Q4 are respectively connected with the other end of the tenth resistor R10, the other ends of the first Schottky diode Q3 and the second Schottky diode Q4 are respectively connected with the third capacitor, and the second Schottky diode Q4 is also connected with the other output end of the sensor;
the zero-crossing sampling circuit comprises a fourth capacitor C4, a second diode D2, a second amplifier U2, an eleventh resistor R11, a twelfth resistor R12, a photoelectric coupler, a thirteenth resistor R13 and a bridge; the output end of the second amplifier U2 is connected with the MPU main control circuit, the fourth capacitor C4 and the second diode D2 are connected in parallel and then connected in series between one input end and the output end of the second amplifier U2, the twelfth resistor R12 and the eleventh resistor R11 are connected between one input end of the second amplifier U2 and the photoelectric coupler, the thirteenth resistor R13 is connected between the photoelectric coupler and the bridge, and the bridge is also used for connecting loads.
2. The relay efficiency compensation circuit of claim 1 wherein the first amplifier U1 and the second amplifier U2 are model LM258.
3. A relay efficiency compensation system comprising the relay efficiency compensation circuit of claim 1 or 2 and a load coupled to the zero-crossing sampling circuit.
4. A relay efficiency compensation system in accordance with claim 3 wherein the load is a non-resistive load.
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| CN201811420998.5A CN109273323B (en) | 2018-11-23 | 2018-11-23 | Relay efficiency compensation circuit and system |
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| CN201811420998.5A CN109273323B (en) | 2018-11-23 | 2018-11-23 | Relay efficiency compensation circuit and system |
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| CN109273323B true CN109273323B (en) | 2024-02-20 |
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| CN203233180U (en) * | 2013-07-19 | 2013-10-09 | 江苏斯菲尔电气股份有限公司 | Double-zero-crossing execution module |
| CN204391754U (en) * | 2014-12-22 | 2015-06-10 | 安徽凯川电力保护设备有限公司 | A kind of voltage-source type static synchronous reactive compensator control circuit |
| CN104952667A (en) * | 2015-07-21 | 2015-09-30 | 福州大学 | Intelligent electromagnetic switch control device for low voltage power supply system |
| CN205212438U (en) * | 2015-10-29 | 2016-05-04 | 江苏矽莱克电子科技有限公司 | High -efficient uncompensated on -off switch |
| CN105552933A (en) * | 2016-02-19 | 2016-05-04 | 国家电网公司 | Electricity grid power compensation control device |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN106229218A (en) * | 2016-08-26 | 2016-12-14 | 江苏智峰电气科技有限公司 | A kind of single twin coil drive circuit of magnetic latching relay |
| CN206962457U (en) * | 2017-05-22 | 2018-02-02 | 龙岩学院 | The new fling-cut switch of secondary capacitor |
| CN207503869U (en) * | 2017-12-14 | 2018-06-15 | 深圳市瑞智电力股份有限公司 | For the low-voltage combination switch of reactive power compensator |
| CN209232672U (en) * | 2018-11-23 | 2019-08-09 | 广州市新舞台灯光设备有限公司 | Relay efficiency compensation circuit and system |
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