CN109031107B - Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact - Google Patents
Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact Download PDFInfo
- Publication number
- CN109031107B CN109031107B CN201810769045.3A CN201810769045A CN109031107B CN 109031107 B CN109031107 B CN 109031107B CN 201810769045 A CN201810769045 A CN 201810769045A CN 109031107 B CN109031107 B CN 109031107B
- Authority
- CN
- China
- Prior art keywords
- diode
- contact
- electrically connected
- relay
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an electronic contact detection circuit for detecting the on-off of a high-voltage relay contact, which comprises a high-voltage relay contact, an input power supply preprocessing module, an isolation power supply module, a relay contact detection module, a contact-on information isolation output module and a relay work detection indicating circuit, wherein the relay work detection indicating circuit comprises a contact-on indicating circuit module provided with a relay contact-on indicating lamp and a relay magnetic force detection indicating circuit module provided with a relay coil driving indicating lamp; the relay contact detection module is arranged at the rear stage of the isolation power module, the front stage of the isolation power module is electrically connected with a direct current input power supply, and two terminals of the auxiliary contact are electrically connected with the output end of the contact information isolation output module. The on-off information state of the high-voltage contact of the high-voltage relay can be effectively monitored, the on-off information state of the high-voltage contact is obtained and indicated, accurate, reliable and effective analysis and judgment information is provided for equipment operation and fault maintenance, and the service life is prolonged.
Description
Technical Field
The invention relates to an electronic auxiliary contact relay, in particular to an electronic auxiliary contact circuit for detecting the contact on-off of a high-voltage relay, which is used for detecting the on-off information state of the high-voltage contact electrical characteristic of a sensing direct-current high-voltage relay.
Background
The direct-current high-voltage relay is commonly used in electric automobiles, charging piles, variable-frequency air conditioners and other equipment, but the direct-current high-voltage relay used on the equipment at present has no real main contact electrical performance reporting function, and the equipment system is difficult to acquire whether the contact on-off is normal or not when performing information acquisition and intelligent self-detection. Such as: the relay coil is electrified, the contact is conducted or not, and if the contact is carbonized, the contact cannot be conducted; in addition, the relay coil is powered off, the power supply is cut off or not, and if the relay is in contact adhesion, the relay cannot be cut off. The intelligent equipment needs to collect and confirm whether the state of the self parts is good or not. At present, a relay with an auxiliary contact is available in the market, but a movable iron core is mechanically linked with a small switch, the relay does not have the function of reporting the electric performance of a main contact, and if the relay is used for collecting on-off information of the contact of the relay, the auxiliary contact is not practical when the situation that the carbonization or adhesion of the main contact is abnormal is actually reported.
Disclosure of Invention
The invention provides an electronic auxiliary contact circuit which can effectively monitor the on-off information state of a high-voltage contact of a high-voltage relay, effectively obtain the on-off information state of two high-voltage contacts of the high-voltage relay, provide accurate, reliable and effective analysis and judgment information for equipment operation and fault maintenance, and improve the service reliability and service life of the high-voltage relay, and aims to solve the problems that the existing direct-current high-voltage relay cannot effectively monitor the on-off information state of the high-voltage contact of the high-voltage relay in the high-voltage on-off working state and is unfavorable for controlling and improving the service reliability and service life of the high-voltage relay. An electronic auxiliary contact circuit for detecting the contact on-off of a high-voltage relay, which is used for detecting and sensing the state of the on-off information of the electrical characteristics of the high-voltage contact of the direct-current high-voltage relay.
The invention adopts the concrete technical scheme for solving the technical problems that: the utility model provides a detect electron auxiliary contact circuit of high-voltage relay contact break-make, includes the high-voltage relay contact, electron auxiliary contact circuit, its characterized in that: the relay work detection and indication circuit comprises a contact-on indication circuit module provided with a relay contact-on indication lamp and a relay magnetic force detection and indication circuit module provided with a relay coil driving indication lamp; the front stage of the isolation power supply module is electrically connected with a direct current input power supply, and the rear stage of the isolation power supply module outputs a 12V power supply for detection; the two terminals of the electronic auxiliary contact are electrically connected with the output end of the contact state information isolation output module. The on-off information state of the high-voltage contacts of the high-voltage relay can be effectively monitored, the on-off information state of the two high-voltage contacts of the high-voltage relay can be effectively obtained, the state change indication warning can be timely obtained, and accurate, reliable and effective analysis and judgment information can be provided for equipment operation and fault maintenance.
Preferably, the input power supply preprocessing module comprises an F2 self-recovery fuse, a D1 diode, a D2 diode, a D3 diode, a D4 diode, an R3 resistor, a C1 capacitor, a VZ7 voltage stabilizing diode, a Q1 triode, a C14 capacitor, wherein the D1 diode, the D2 diode, the D3 diode and the D4 diode form a full-bridge circuit, and the risk of polarity misconnection of the direct current input power supply to the circuit is effectively avoided. The R3 resistor, the C1 capacitor, the VZ7 voltage stabilizing diode, the Q1 triode and the C14 capacitor form a simple voltage-reducing and stabilizing circuit, the input direct-current power supply is 9-60 VDC and is simple in voltage reduction and stabilizing at 9-18V, the emitter of the Q1 triode is used for outputting, and the C14 capacitor plays a role in stabilizing voltage.
Preferably, the isolation power supply module comprises an isolation transformer B2, an 18 th optocoupler isolator, a 17 th voltage stabilizer, a DC-DC buck-boost chip U1 and a full-wave rectifier bridge, wherein the input end of the DC-DC buck-boost chip U1 is electrically connected with the emitter of a 1 st triode at the output end of the input power supply pretreatment module, the collector of the 1 st triode is electrically connected with the output end of the full-wave rectifier bridge, the input end of the full-wave rectifier bridge is electrically connected with a DC input power supply, the input end of the isolation transformer B2 is connected with the input end and the output end of the DC-DC boost chip in parallel, the emitter pin of the output end of the 18 th optocoupler isolator is electrically connected with the pin of the feedback end of the DC-DC boost chip U1, the feedback end pin of the DC-DC boosting chip U1 is connected with 69 th resistor in series and then is electrically connected with the power ground for detection, the collector pin of the output end of the 18 th optocoupler isolator is electrically connected with the input end of the DC-DC boosting chip, the anode of the input end of the 18 th optocoupler isolator is connected with 70 th resistor in series and then is connected with the output end of the isolation transformer B2 in series, the cathode of the 26 th diode is electrically connected with 70 th resistor, the other end of the output end of the isolation transformer B2 is electrically connected with the power ground for detection, and a 16 th capacitor is connected between the series node of the cathode of the 26 th diode and 70 th resistor in series and the power ground for detection in parallel. The stability, reliability and effectiveness of the power supply used for detection are improved, and interference factors are reduced.
Preferably, the relay magnetic force detection indication circuit module comprises a 7 th light emitting diode, a 2 nd resistor and a Hall switch U2, wherein after the 7 th light emitting diode and the 2 nd resistor are connected in series, the cathode of the 7 th light emitting diode is electrically connected with the output end of the Hall switch U2. The Hall switch U2 induces an electromagnetic field, the relay coil is electrified, the Hall switch U2 induces a magnetic field signal, the output end of the second pin of the Hall switch U2 is connected with the negative electrode of the power-on source, the 7 th light-emitting diode red lamp is turned on, reliability and effectiveness of power-on state indication of the relay coil are improved, and simplicity, convenience and effectiveness are achieved.
Preferably, the contact-on indication circuit module comprises a 4 th resistor and an 8 th light emitting diode,
after the 4 th resistor is connected with the 8 th light emitting diode in series, the cathode of the 8 th light emitting diode is connected with the detection power supply ground. The other end of the 4 th resistor is electrically connected with the collector electrode of the 3 rd triode at the output end of the relay contact detection module, the relay contacts are connected, and the 8 th light emitting diode is lightened by output current. The device comprises a 2 nd triode, a 3 rd triode, a 4 th resistor, an 8 th light emitting diode, a 20 th optocoupler isolator and a 1 st capacitor of a relay contact detection module, wherein a 2 nd triode collector is connected with a 3 rd triode emitter in series, the 3 rd emitter collector is sequentially connected with the 4 th resistor and the 8 th light emitting diode in series and then is electrically connected with the cathode of a detection power supply module, the 2 nd triode emitter is electrically connected with a 12V power supply of the anode of the detection power supply module, the 3 rd triode emitter is electrically connected with the anode of the input end of the 20 th optocoupler isolator, and the cathode of the input end of the 20 th optocoupler isolator is connected with the cathode of the detection power supply module after being connected with the 75 th resistor in series; two static contacts of the high-voltage relay are respectively connected in series in base circuits of the 2 nd triode and the 3 rd triode. The reliability, convenience and effectiveness of the dynamic and static contact connection indication of the relay are improved.
0009. Preferably, the relay contact detection module comprises a 2 nd triode, a 28 th diode, a 73 rd resistor, a 30 th diode, a 6 th diode and a J_A socket of a wire-incoming side detection circuit, a 3 rd triode, a 9 th diode, a 74 th resistor, a 31 st diode, a 11 th diode and a J_B socket of the wire-outgoing side detection circuit, a 77 th resistor, a 29 th diode, a 10 th diode and a J_D socket of a common loop, wherein a signal detection wire signal 1 is led out from a contact point of the relay contact wire-incoming side and is connected with a contact point detection end J-A, high-voltage diodes D6 and D30 are connected in series with the contact point detection circuit, a cathode contact point end of the high-voltage diode D6 and an anode contact point detection circuit end of the high-voltage diode D30; the signal detection line signal 2 led out from the contact point at the outlet side of the relay contact point is connected with the contact point detection end J-B, and is connected with the high-voltage diodes D11 and D31 in series with the contact point detection circuit, the cathode contact point end of the high-voltage diode D11 and the anode contact point detection circuit end of the high-voltage diode D31; the signal detection line signal 3 led out from the movable contact of the relay is connected with the common loop J-D of the contact detection line. The relay contacts are disconnected, the movable contacts are separated from the fixed contacts, and the fixed contacts at the two sides of the inlet and outlet line are isolated and blocked in the same direction through the high-voltage diodes at the two sides, so that the voltage resistance and the insulation safety and reliability between the two contacts are ensured.
0010. Preferably, the base circuits of the 2 nd triode and the 3 rd triode comprise a wire inlet side diode, a wire outlet side diode, a 73 rd resistor, a 74 th resistor, a 28 th diode and a 9 th diode, wherein the wire inlet side diode is connected with the 73 rd resistor in series, the 73 rd resistor is connected with the 28 th diode in series, the anode of the 28 th diode is electrically connected with the base of the 2 nd triode, and the cathode of the wire inlet side diode is electrically connected with a wire inlet side static contact of the relay; the outgoing line side diode is connected with the 74 th resistor in series, the 74 th resistor is connected with the 9 th diode in series, the anode of the 9 th diode is electrically connected with the base electrode of the 3 rd triode, and the cathode of the outgoing line side diode is electrically connected with the static contact of the outgoing line side of the relay. The reliability and effectiveness of the base electrode loop sampling are improved, the blocking of the external high-voltage protection effect is improved, and the occurrence of damage fault phenomenon is reduced.
0011. Preferably, the incoming line side diode is formed by connecting a cathode and an anode of a 6 th diode and a cathode and an anode of a 30 th diode in series, and the cathode of the 6 th diode is electrically connected with the incoming line side static contact of the relay; the outgoing line side diode is formed by connecting an 11 th diode and a 31 st diode in series, and the cathode of the 11 th diode is electrically connected with the static contact of the outgoing line side of the relay. The blocking external high-voltage protection effect is improved, and the occurrence of damage fault phenomenon is reduced.
0012. Preferably, the cathode of the 28 th diode is electrically connected with a 29 th diode, and the anode of the 29 th diode is electrically connected with the power ground of the power module for detection; the cathode of the 9 th diode is electrically connected with the 10 th diode, and the anode of the 10 th diode is electrically connected with the power ground of the power module for detection. The blocking external high-voltage protection effect is improved, and the occurrence of damage fault phenomenon is reduced.
0013. Preferably, a voltage regulator and a 1 st capacitor are connected in parallel between the base electrode of the 1 st triode and the power supply ground of the power supply module for detection, and a 14 th capacitor is connected in parallel between the emitter electrode of the 1 st triode and the power supply ground of the power supply module for detection; the 17 th voltage stabilizer is connected in parallel between the cathode of the input end of the 18 th optocoupler isolator and the power supply ground of the power supply module for detection, and the cathode of the input end of the 18 th optocoupler isolator is connected with the 15 th capacitor and the 71 st resistor in series in sequence and then is electrically connected with the positive electrode of the power supply module for detection. And the stability and reliability of the isolated power supply are improved.
0014. Preferably, the 17 th voltage stabilizer is an adjustable three-terminal device, an adjusting terminal pin of the 17 th voltage stabilizer is connected with a 72 th resistor in series and then is electrically connected with the power ground of the power module for detection, and an adjusting terminal pin of the 17 th voltage stabilizer is connected with a 71 st resistor in series and then is electrically connected with the positive electrode of the power module for detection. And the stability and reliability of the isolated power supply are improved.
0015. The beneficial effects of the invention are as follows: the on-off information state of the high-voltage contacts of the high-voltage relay can be effectively monitored, the on-off information state of the two high-voltage contacts of the high-voltage relay can be effectively obtained, state change indication warning notification can be timely obtained, accurate and reliable effective analysis judgment information is provided for equipment operation and fault maintenance, the change of resistance values at two ends of the auxiliary contacts S1 and S2 is improved, the on-off information output of the electric characteristics of the main contacts is reported, the on-off information output can be used as signal acquisition of a low-voltage control circuit, and the service reliability and the service life of the direct-current high-voltage relay are improved. For carbonization and non-conduction or adhesion of the contact to keep power off, normal on and off are sensed to be true and tangential, and a report is transmitted in a mode of assisting the contact. The electronic auxiliary contact circuit is additionally arranged on a matched high-voltage relay structure, so that the output end of the opto-coupler isolator in the electronic auxiliary contact circuit is monitored by random or remote monitoring equipment to be perfectly combined into an electronic auxiliary contact relay, the electronic auxiliary contact relay is a traditional relay function 1+1, the output of the two ends of the auxiliary contact is live broadcasting of a main contact, and the information is accurate and reliable. If the user needs to randomly or remotely monitor the operation state of the relay, the user is satisfied with the choice of the electronic auxiliary contact relay. The high-voltage direct-current relay with the additional contact on-off information sensing function, wherein the names of two ends of the electronic auxiliary contact circuit which are isolated and output are called as 'auxiliary contacts', and the electronic auxiliary contact circuit for detecting the on-off of the high-voltage relay contact is additionally arranged on a matched high-voltage relay structure and is perfectly combined into a 'relay with the electronic auxiliary contact', so that the electronic auxiliary contact relay is named. It has the following terminals: coil power input (red line+, black line-); a detection module power input (pink line+, gray line-); high voltage stationary contact output (buried nut bolt+, buried nut bolt-); auxiliary contact outputs (two white lines, no positive or negative).
Drawings
0016. The invention is described in further detail below with reference to the drawings and the detailed description.
0017. Fig. 1 is a schematic block diagram of the circuit principle structure of the electronic auxiliary contact circuit for detecting the on-off of the contact of the high-voltage relay.
0018. Fig. 2 is a schematic circuit diagram of an electronic auxiliary contact circuit for detecting the on-off of a high-voltage relay contact.
0019. Fig. 3 is a schematic diagram of a relay used in the circuit configuration of fig. 2.
Detailed Description
0020. In the embodiment shown in fig. 1 and fig. 2, an electronic auxiliary contact detection circuit for detecting the on-off of a high-voltage relay contact comprises a high-voltage relay 60 contact, and further comprises an isolation power supply module 10, a detection power supply module 20, a relay contact detection module 90, a relay contact detection module which is electrically connected with a relay contact three-wire phase, a contact state information isolation output module 50 and a relay work detection indicating circuit, wherein the relay work detection indicating circuit comprises a contact-on indicating circuit module 40 provided with a relay contact-on indicating lamp D8 and a relay magnetic force detection indicating circuit module 30 provided with a relay coil driving indicating lamp D7; the power supply 20 for detection is output from the rear stage of the isolation power supply module, the front stage of the isolation power supply module 10 is electrically connected with the 9V-60V input power supply preprocessing module 80, and the two terminals 70 of the auxiliary contact are electrically connected with the output end of the contact state information isolation output module 50. Two terminals of the auxiliary contact are connected to information acquisition remote monitoring or random monitoring by using wires, and the two terminals can be selected by a user according to actual monitoring requirements: for example, two terminals 70 of the auxiliary contact may be connected to a low-voltage circuit for information collection, a first output contact S1 in the two terminals 70 of the auxiliary contact is connected to +5v, and a second output contact S2 is connected in series to a lower bias resistor 5K to ground, so that the high-low level of the second output contact S2 is the on-off information of the relay contact, and the high-on state and the low-off state are achieved; the user can also cooperate with the fet MOS tube to form one or more switches that are either synchronous or asynchronous with the relay. In summary, the user can flexibly apply. The two terminals of the auxiliary contact are electrically connected with the two test pens of the ohmmeter, the resistance value change between the two ends S1 and S2 of the auxiliary contact can be detected, the resistance value is smaller than 50Ω when the high-voltage relay contacts are connected, and the resistance value is infinite when the high-voltage relay contacts are disconnected. The circuit is made as a circuit board. Is arranged in the relay shell (the design of the relay cavity is reserved in a space). A complete relay, named "auxiliary contact relay", is formed, the relay output has two main contact terminals: a wire inlet side (embedded nut) and a wire outlet side (embedded nut); two auxiliary contact terminals: two wires. S1 and S2 are two terminals, and S1 is electrically connected with 3 pins of an optocoupler solid state relay U20; s2 is electrically connected with 4 pins of the optocoupler solid state relay U20. The two wires output by the auxiliary contact are provided for a user and used for judging the on and off of the main contact and are connected with low-voltage sensing equipment of the user. The relay is provided with a fixed contact assembly and a movable reed 05, the movable reed is provided with a return spring 04 and a movable contact signal wire J-D, a ceramic cavity 03 is arranged between the movable reed 05 and a static output assembly, the static output assembly comprises a wire inlet side fixed contact assembly 01 and a wire outlet side fixed contact assembly 02, the wire inlet side fixed contact assembly 01 is provided with a wire inlet side fixed contact signal wire J-a, the wire outlet side fixed contact assembly 02 is provided with a wire outlet side fixed contact signal wire J-B, the wire inlet side fixed contact signal wire J-a, the wire outlet side fixed contact signal wire J-B and the movable contact signal wire J-D are respectively and electrically connected with an electronic auxiliary contact circuit (although not specifically shown in fig. 3, the whole electronic auxiliary contact circuit for detection is integrally arranged in the relay), and the wire inlet side fixed contact J-A, the wire outlet side fixed contact J-B and the movable contact J-D of the relay are correspondingly and electrically connected.
0021. The relay magnetic force detection indication circuit module comprises a 7 th light emitting diode D7, a 2 nd resistor R2 and a Hall switch U2, wherein after the 7 th light emitting diode D7 and the 2 nd resistor R2 are connected in series, the cathode of the 7 th light emitting diode D7 is electrically connected with the output end of the Hall switch U2. The Hall switch induces an electromagnetic field, the relay coil is electrified, the Hall switch is opened by the intensity of the magnetic field, and the 7 th light-emitting diode D7 is turned on to light up the red lamp. The contact-on indication circuit module comprises a 2 nd triode Q2, a 3 rd triode Q3, a 4 th resistor R4, an 8 th light emitting diode D8, a 20 th optocoupler isolator U20 and a 1 st capacitor C1, wherein the collector of the 2 nd triode Q2 is connected with the emitter of the 3 rd triode Q3 in series, the collector of the 3 rd emitting electrode Q3 is sequentially connected with the 4 th resistor R4 and the 8 th light emitting diode D8 in series and then is electrically connected with the negative electrode-VO of the detection power supply module, the emitter of the 2 nd triode Q2 is electrically connected with the positive electrode +12V of the detection power supply module, the emitter of the 3 rd triode Q3 is electrically connected with the 1 st pin of the anode of the input end of the 20 th optocoupler isolator U20, and the cathode of the input end of the 20 th optocoupler isolator U20 is electrically connected with the negative electrode of the detection power supply module after being connected with the 75 th resistor R75 in series; two static contacts of the high-voltage relay are respectively connected in series in base circuits of the 2 nd triode and the 3 rd triode. The 20 th optocoupler isolator U20 optocoupler can also be a solid-state relay, and the output 3 rd pin and the 4 th pin of the 20 th optocoupler isolator U20 are not in a direction when connected with a circuit, and the load capacity is 0.13A. The isolation power module comprises an isolation transformer B2, an 18 th optocoupler isolator U18, a 17 th voltage stabilizer U17, a DC-DC boosting chip U1 and a full-wave rectifier bridge, wherein the full-wave rectifier bridge is composed of a 1 st diode, a 2 nd diode, a 3 rd diode and a 4 th diode, the input end of the DC-DC boosting chip U1 is electrically connected with the emitter of a 1 st triode Q1, the collector of the 1 st triode Q1 is electrically connected with the output end of the full-wave rectifier bridge, the input end of the isolation transformer B2 is connected with the input end and the output end of the DC-DC boosting chip U1 in parallel, the emitter pin of the 18 th optocoupler isolator U18 is electrically connected with the feedback pin of the DC-DC boosting chip U1, the feedback end pin of the DC-DC boosting chip U1 is connected with the 69 th resistor R69 in series and then is electrically connected with the power supply ground of the detection power supply module, the collector pin of the output end of the 18 th optocoupler isolator U18 is electrically connected with the input end of the DC-DC boosting chip U1, the anode of the input end of the 18 th optocoupler isolator U18 is connected with the 70 th resistor R70 in series and then is connected with the 26 th diode D26 in series and then is connected with the output end of the isolation transformer B2, the cathode of the 26 th diode D26 is electrically connected with the 70 th resistor R70, the other end of the output end of the isolation transformer B2 is electrically connected with the power supply ground of the detection power supply module, and a 16 th capacitor C16 is connected between the series node of the 26 th diode D26 cathode and the 70 th resistor R70 in series and the power supply ground of the detection power supply module in parallel. The 1 st resistor R1 and the 5 th diode are connected in series and then connected with the input end of the isolation transformer B2 in parallel, and the anode of the 5 th diode is electrically connected with the output end of the DC-DC boosting chip U1. The isolation transformer B2 is a high-frequency transformer, the primary pole is isolated, and the isolation voltage is greater than 2750V alternating current. The DC-DC boost chip U1, the error amplification adjustment chip U17 and the isolation transformer B2 are combined to generate a power +12V of the detection power supply module which is isolated at the two ends of the 16 th capacitor. The base circuits of the 2 nd triode Q2 and the 3 rd triode Q3 comprise a wire inlet side diode, a wire outlet side diode, a 73 rd resistor R73, a 74 th resistor R74, a 28 th diode D28 and a 9 th diode D9, the wire inlet side diode is connected with the 73 rd resistor R73 in series, the 73 rd resistor R73 is connected with the 28 th diode D28 in series, the anode of the 28 th diode D28 is electrically connected with the base of the 2 nd triode Q2, and the cathode of the wire inlet side diode is electrically connected with a wire inlet side static contact J-A of the relay; the outgoing line side diode is connected with the 74 th resistor in series, the 74 th resistor is connected with the 9 th diode in series, the anode of the 9 th diode is electrically connected with the base electrode of the 3 rd triode, and the cathode of the outgoing line side diode is electrically connected with the outgoing line side static contact J-B of the relay. The grounding end of the movable contact J-D in the relay is electrically connected with the power supply ground of the power supply module for detection; the incoming line side diode is formed by connecting a cathode and an anode of a 6 th diode D6 and a cathode and an anode of a 30 th diode D30 in series, and the cathode of the 6 th diode D6 is electrically connected with a static contact J-A on the incoming line side of the relay; the outgoing line side diode is formed by connecting an 11 th diode D11 and a 31 st diode D31 in series, wherein the cathode of the 11 th diode D11 is electrically connected with a relay outgoing line side static contact J-B. The cathode of the 28 th diode D28 is electrically connected with a 29 th diode D29, and the anode of the 29 th diode D29 is electrically connected with the power ground of the power module for detection; the cathode of the 9 th diode D9 is electrically connected with a 10 th diode D10, and the anode of the 10 th diode D10 is electrically connected with the power ground of the power module for detection. The relay inner static contact J-D is in moving contact or disconnection with the relay inlet side static contact J-A and the relay outlet side static contact J-B. The 28 th diode D28, the 30 th diode D30, the 6 th diode D6, the 9 th diode D9, the 31 st diode D31, the 11 th diode D11, the 10 th diode D10 and the 29 th diode D29 in the circuit are all used for blocking external high-voltage crosstalk, multiple anti-interference protection, and stability, reliability and effectiveness of detection are improved. A voltage stabilizing tube ZV7 and a 1 st capacitor C1 are connected in parallel between the base electrode of the 1 st triode Q1 and the power supply ground of the power supply module for detection, and a 14 th capacitor C14 is connected in parallel between the emitter electrode of the 1 st triode Q1 and the power supply ground of the power supply module for detection; an error amplification adjustment chip U17 is connected in parallel between the cathode of the input end of the 18 th optocoupler isolator U18 and the power supply ground of the power supply module for detection, and the cathode of the input end of the 18 th optocoupler isolator U18 is connected in series with a 15 th capacitor C15 and a 71 st resistor R71 in sequence and then is electrically connected with the power supply anode of the power supply module for detection. The control input end pin of the error amplification adjustment chip is connected with the 72 th resistor R72 in series and then is electrically connected with the power ground of the power supply module for detection, and the control input end pin of the error amplification adjustment chip U17 is connected with the 71 st resistor R71 in series and then is electrically connected with the positive electrode of the power supply module for detection.
0022. When the circuit works, the isolation power supply module 10 establishes that the isolation power supply of +12V is positive and negative from top to bottom at the two ends of the 16 th capacitor C16. The 16 th capacitor C16 positive-the 2 nd triode Q2-the 3 rd triode Q3- (the 4 th resistor R4-the 8 th light emitting diode D8 blue lamp) is connected in parallel (the 1 st pin of the 20 th optocoupler isolator U20, the 2 nd pin of the 20 th optocoupler isolator U20 and the 75 th resistor R75)) -the 16 th capacitor C16 negative together form a loop, which is named as a loop 1; two stationary contacts of the high-voltage relay are connected in series in base circuits of the 2 nd triode Q2 and the 3 rd triode Q3: the path 1 is: the 16 th capacitor C16 is positive, the 2 nd triode Q2 emitter, the 2 nd triode Q2 base, the 28 th diode D28, the 73 rd resistor R73, the 30 th diode D30, the 6 th diode D6, the relay inlet wire side static contact J-A, the relay movable contact J-D and the 16 th capacitor C16 are negative; the other path is as follows: the 16 th capacitor C16 is positive, the 3 rd triode Q3 emitter, the 3 rd triode Q3 base, the 9 th diode D9, the 74 th resistor R74, the 31 st diode D31, the 11 th diode D11, the relay outgoing line side static contact J-B, the relay movable contact J-D and the 16 th capacitor C16 are negative. When the current characteristic of the static contact J-A at the incoming line side of the relay and the movable contact J-D of the relay flows, the 2 nd triode Q2 forms base current, so that the collector of the 2 nd triode Q2 is conducted. When the current characteristic of the static contact J-B at the outlet side of the relay and the movable contact J-D of the relay flows, the 3 rd triode Q3 forms base current, so that the collector of the 3 rd triode Q3 is conducted. Therefore, when the electric characteristics of the static contact J-A at the incoming line side of the relay and the static contact J-D at the outgoing line side of the relay circulate, the two transistors Q2 and Q3 of the 2 nd triode Q2 and the 3 rd triode Q3 form base currents, the collector electrodes of the 2 nd triode Q2 and the 3 rd triode Q3 are conducted, the loop 1 forms electric currents, the 8 th light emitting diode D8 blue lamp is lighted, the infrared light emitting diodes in the 1 st pin and the 2 nd pin of the 20 th optocoupler isolator U20 are also lighted, the resistance values of the 3 rd pin and the 4 th pin of the photosensitive element in the 20 th optocoupler isolator U20 are smaller than 50 ohms, and the definition is "on". On the contrary, when the electrical characteristics of the static contact J-A at the incoming line side of the relay and the static contact J-D at the outgoing line side of the relay are not on, the blue lamp is not on, the resistance values of the 3 rd pin and the 4 th pin of the photosensitive element in the 20 th optocoupler isolator U20 are larger than 100M to infinity, and the middle from 50 ohm to 100M is jumped to be empty. Because the two ends of the relay contact are part of the auxiliary contact circuit, the relay contact is connected in series in the auxiliary contact detection loop, and is used for switching the auxiliary contact indicator lamp and photoelectric coupling input in person. If the electrical property of the contact of the relay is on, the D8 blue lamp indicator lights, and the resistance value (namely the auxiliary contact) between the 3 rd pin and the 4 th pin of the optical coupler isolator U20 is smaller than 50 ohms; if the electrical performance of the contact of the relay is not enabled, the D8 blue lamp indicator lamp is not lightened, and the resistance value (namely the auxiliary contact) between the 3 rd pin and the 4 th pin of the optocoupler isolator U20 is larger than 100M ohms (infinity). Further, if the contacts of the relay are carbonized, the relay ages, and the electrical performance of the contacts is not necessarily conducted although the relay is attracted. The auxiliary contact of the invention truly reflects the on-off of the electrical characteristic of the relay contact. Because the on/off of the 8 th light emitting diode D8 blue lamp and the resistance values of the 3 pin and the 4 pin (namely auxiliary contacts) of the 20 th optocoupler isolator U20 are smaller than 50 ohms and larger than 100M are both the on/off results of the relay contacts, the information feedback is accurate and reliable.
0023. The foregoing and construction describes the basic principles, principal features and advantages of the present invention product, as will be appreciated by those skilled in the art. The foregoing examples and description are provided to illustrate the principles of the invention and to provide various changes and modifications without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a detect electron auxiliary contact circuit of high-voltage relay contact break-make, includes high-voltage relay contact, its characterized in that: the relay work detection indicating circuit comprises a contact-on indicating circuit module provided with a relay contact-on indicating lamp and a relay magnetic force detection indicating circuit module provided with a relay coil driving indicating lamp; the power module for detecting the output of the rear stage of the isolation power module is electrically connected with a direct current input power supply, and two terminals of the auxiliary contact are electrically connected with the output end of the contact state information isolation output module; the relay magnetic force detection indication circuit module comprises a 7 th light emitting diode, a 2 nd resistor and a Hall switch, wherein after the 7 th light emitting diode and the 2 nd resistor are connected in series, the cathode of the 7 th light emitting diode is electrically connected with the output end of the Hall switch; the contact-on indication circuit module comprises a 2 nd triode, a 3 rd triode, a 4 th resistor, an 8 th light emitting diode, a 20 th optocoupler isolator and a 1 st capacitor, wherein a 2 nd triode collector is connected with a 3 rd triode emitter in series, the 3 rd emitter collector is sequentially connected with the 4 th resistor and the 8 th light emitting diode in series and then is electrically connected with the cathode of the detection power supply module, the 2 nd triode emitter is electrically connected with a 12V power supply of the positive electrode of the detection power supply module, the 3 rd triode collector is electrically connected with the anode of the input end of the 20 th optocoupler isolator, and the cathode of the input end of the 20 th optocoupler isolator is connected with the cathode of the detection power supply module after being connected with the 75 th resistor in series; two static contacts of the high-voltage relay are respectively connected in series in base circuits of the 2 nd triode and the 3 rd triode.
2. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high-voltage relay according to claim 1, wherein: the input power supply preprocessing module comprises an F2 self-recovery fuse, a D1 diode, a D2 diode, a D3 diode, a D4 diode, an R3 resistor, a C1 capacitor, a VZ7 voltage stabilizing diode, a Q1 triode and a C14 capacitor, wherein the D1 diode, the D2 diode, the D3 diode and the D4 diode form a full-bridge circuit, and the R3 resistor, the C1 capacitor, the VZ7 voltage stabilizing diode, the Q1 triode and the C14 capacitor form a simple voltage-reducing and stabilizing circuit.
3. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high-voltage relay according to claim 1, wherein: the isolation power module comprises an isolation transformer, an 18 optical coupler isolator, a 17 voltage stabilizer, a DC-DC boosting chip and a full-wave rectifier bridge, wherein the input end of the DC-DC boosting chip is electrically connected with the emitter of a 1 st triode, the collector of the 1 st triode is electrically connected with the output end of the full-wave rectifier bridge, the input end of the full-wave rectifier bridge is electrically connected with a direct current input power supply, the input end of the isolation transformer is connected with the input end of the DC-DC boosting chip in parallel, the emitter pin of the output end of the 18 optical coupler isolator is electrically connected with the feedback pin of the DC-DC boosting chip, the feedback pin of the DC-DC boosting chip is electrically connected with the power supply ground of the detection power module after being connected with the 69 th resistor in series, the collector pin of the output end of the 18 optical coupler isolator is electrically connected with the input end of the DC-DC boosting chip in series, the anode of the 18 optical coupler isolator is connected with the 70 th diode in series after being connected with the 70 th resistor in series, the cathode of the 26 th diode is electrically connected with the output end of the isolation transformer, the other end of the isolation transformer is electrically connected with the 70 th resistor in parallel, and the other end of the isolation transformer is electrically connected with the power supply ground of the detection power supply module, and the power supply is connected between the 26 th diode and the 70 and the power supply capacitor is connected with the power supply node 16 in series.
4. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high-voltage relay according to claim 1, wherein: the base circuits of the 2 nd triode and the 3 rd triode comprise an incoming line side diode, an outgoing line side diode, a 73 rd resistor, a 74 th resistor, a 28 th diode and a 9 th diode, wherein the incoming line side diode is connected with the 73 rd resistor in series, the 73 rd resistor is connected with the 28 th diode in series, the anode of the 28 th diode is electrically connected with the base of the 2 nd triode, and the cathode of the incoming line side diode is electrically connected with an incoming line side static contact of the relay; the outgoing line side diode is connected with the 74 th resistor in series, the 74 th resistor is connected with the 9 th diode in series, the anode of the 9 th diode is electrically connected with the base electrode of the 3 rd triode, and the cathode of the outgoing line side diode is electrically connected with the static contact of the outgoing line side of the relay.
5. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high voltage relay according to claim 4, wherein: the incoming line side diode is formed by connecting a cathode and an anode of a 6 th diode and a cathode and an anode of a 30 th diode in series, and the cathode of the 6 th diode is electrically connected with the incoming line side static contact of the relay; the outgoing line side diode is formed by connecting an 11 th diode and a 31 st diode in series, and the cathode of the 11 th diode is electrically connected with the static contact of the outgoing line side of the relay.
6. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high voltage relay according to claim 4, wherein: the cathode of the 28 th diode is electrically connected with a 29 th diode, and the anode of the 29 th diode is electrically connected with the power supply ground of the power supply module for detection; the cathode of the 9 th diode is electrically connected with the 10 th diode, and the anode of the 10 th diode is electrically connected with the power ground of the power module for detection.
7. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high voltage relay according to claim 3, wherein: a voltage stabilizing tube and a 1 st capacitor are connected in parallel between the base electrode of the 1 st triode and the power supply ground of the power supply module for detection, and a 14 th capacitor is connected in parallel between the emitter electrode of the 1 st triode and the power supply ground of the power supply module for detection; an error amplification adjustment chip is connected in parallel between the cathode of the input end of the 18 th optical coupler isolator and the power supply ground of the power supply module for detection, and the cathode of the input end of the 18 th optical coupler isolator is connected with the 15 th capacitor and the 71 st resistor in series in sequence and then is electrically connected with the positive electrode of the power supply module for detection.
8. An electronic auxiliary contact circuit for detecting the opening and closing of a contact of a high voltage relay according to claim 7, wherein: the control input end pin of the error amplification adjustment chip is connected with the 72 th resistor in series and then is electrically connected with the power ground of the power module for detection, and the control input end pin of the error amplification adjustment chip is connected with the 71 st resistor in series and then is electrically connected with the positive electrode of the power module for detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810769045.3A CN109031107B (en) | 2018-07-13 | 2018-07-13 | Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810769045.3A CN109031107B (en) | 2018-07-13 | 2018-07-13 | Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109031107A CN109031107A (en) | 2018-12-18 |
| CN109031107B true CN109031107B (en) | 2023-10-03 |
Family
ID=64642111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810769045.3A Active CN109031107B (en) | 2018-07-13 | 2018-07-13 | Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109031107B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061549B (en) * | 2019-05-29 | 2024-03-26 | 上海瑞垒电子科技有限公司 | Intelligent high-voltage direct-current relay module |
| CN113049950B (en) * | 2021-03-05 | 2024-02-09 | 阳光电源股份有限公司 | Relay detection device and method and charging pile |
| CN113555254A (en) * | 2021-07-23 | 2021-10-26 | 深圳市多恩技术有限公司 | Relay contact safety control system and detection method |
| CN114166176B (en) * | 2021-11-23 | 2024-05-24 | 武汉华中天纬测控有限公司 | Substation electric brake gesture detection circuit and method |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149530A (en) * | 2013-01-25 | 2013-06-12 | 合肥市英唐科技有限公司 | Relay tester |
| CN203572931U (en) * | 2013-11-18 | 2014-04-30 | 深圳市易能电气技术有限公司 | Detection feedback circuit |
| CN204595156U (en) * | 2015-05-25 | 2015-08-26 | 淮北市华明工业变频设备有限公司 | Middle frequency furnace transistors breakdown detects and counts the road that conducts electricity |
| CN204882821U (en) * | 2015-08-11 | 2015-12-16 | 厦门威尔圣电气股份有限公司 | Killer switch state detection circuitry |
| CN105223939A (en) * | 2015-11-06 | 2016-01-06 | 武汉市农业机械化科学研究所 | Be applicable to the multi-source heat transfer agent data acquisition and controlling integration fexible unit of agriculture Internet of Things application |
| CN105301491A (en) * | 2015-12-02 | 2016-02-03 | 上海航空电器有限公司 | State monitoring circuit for breaker with auxiliary contacts |
| CN105425144A (en) * | 2015-11-11 | 2016-03-23 | 浙江中控自动化仪表有限公司 | Relay fault detection circuit and fault detection method thereof |
| CN205335635U (en) * | 2015-12-25 | 2016-06-22 | 广州番禺电缆集团有限公司 | High -voltage board area electric protection device |
| CN205539381U (en) * | 2016-03-31 | 2016-08-31 | 惠州中城电子科技有限公司 | Under -voltage relay of preventing false retrieval floodgate detection circuitry that opens and shuts |
| CN106099866A (en) * | 2016-06-20 | 2016-11-09 | 国家电网公司 | There is the circuit breaker operation mechanism protection device of short message sending function |
| CN205787014U (en) * | 2016-05-24 | 2016-12-07 | 深圳市沃特玛电池有限公司 | A kind of D.C. contactor main contacts testing circuit |
| CN106771997A (en) * | 2016-11-16 | 2017-05-31 | 惠州市蓝微新源技术有限公司 | A kind of energy-storage system contactor adhesion detection means |
| CN106877284A (en) * | 2017-04-07 | 2017-06-20 | 辽宁工业大学 | Pure hardware circuit modularization clock switch controller |
| CN106990353A (en) * | 2017-05-09 | 2017-07-28 | 浙江英洛华新能源科技有限公司 | A kind of relay fault detecting circuit and the relay with the circuit |
| CN107015142A (en) * | 2017-04-01 | 2017-08-04 | 蚌埠市双环电子集团股份有限公司 | A kind of intelligent high-pressure D.C. contactor |
| CN107275157A (en) * | 2017-07-24 | 2017-10-20 | 浙江英洛华新能源科技有限公司 | A kind of relay movement part detection circuit and the relay with the circuit |
| CN107402053A (en) * | 2017-08-07 | 2017-11-28 | 上海信通机电工程有限公司 | Two-wire system contact-type electronic level-sensing device |
| CN108119252A (en) * | 2018-01-02 | 2018-06-05 | 南通市玉翔光学元件有限公司 | A kind of diesel engine stops in emergency circuit and its implementation |
| CN208636402U (en) * | 2018-07-13 | 2019-03-22 | 浙江英洛华新能源科技有限公司 | Detect the electron assistant contact circuit of high-voltage relay contact on-off |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175943B (en) * | 2011-02-12 | 2013-12-11 | 中兴通讯股份有限公司 | Load overcurrent protector state detection device and method |
-
2018
- 2018-07-13 CN CN201810769045.3A patent/CN109031107B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149530A (en) * | 2013-01-25 | 2013-06-12 | 合肥市英唐科技有限公司 | Relay tester |
| CN203572931U (en) * | 2013-11-18 | 2014-04-30 | 深圳市易能电气技术有限公司 | Detection feedback circuit |
| CN204595156U (en) * | 2015-05-25 | 2015-08-26 | 淮北市华明工业变频设备有限公司 | Middle frequency furnace transistors breakdown detects and counts the road that conducts electricity |
| CN204882821U (en) * | 2015-08-11 | 2015-12-16 | 厦门威尔圣电气股份有限公司 | Killer switch state detection circuitry |
| CN105223939A (en) * | 2015-11-06 | 2016-01-06 | 武汉市农业机械化科学研究所 | Be applicable to the multi-source heat transfer agent data acquisition and controlling integration fexible unit of agriculture Internet of Things application |
| CN105425144A (en) * | 2015-11-11 | 2016-03-23 | 浙江中控自动化仪表有限公司 | Relay fault detection circuit and fault detection method thereof |
| CN105301491A (en) * | 2015-12-02 | 2016-02-03 | 上海航空电器有限公司 | State monitoring circuit for breaker with auxiliary contacts |
| CN205335635U (en) * | 2015-12-25 | 2016-06-22 | 广州番禺电缆集团有限公司 | High -voltage board area electric protection device |
| CN205539381U (en) * | 2016-03-31 | 2016-08-31 | 惠州中城电子科技有限公司 | Under -voltage relay of preventing false retrieval floodgate detection circuitry that opens and shuts |
| CN205787014U (en) * | 2016-05-24 | 2016-12-07 | 深圳市沃特玛电池有限公司 | A kind of D.C. contactor main contacts testing circuit |
| CN106099866A (en) * | 2016-06-20 | 2016-11-09 | 国家电网公司 | There is the circuit breaker operation mechanism protection device of short message sending function |
| CN106771997A (en) * | 2016-11-16 | 2017-05-31 | 惠州市蓝微新源技术有限公司 | A kind of energy-storage system contactor adhesion detection means |
| CN107015142A (en) * | 2017-04-01 | 2017-08-04 | 蚌埠市双环电子集团股份有限公司 | A kind of intelligent high-pressure D.C. contactor |
| CN106877284A (en) * | 2017-04-07 | 2017-06-20 | 辽宁工业大学 | Pure hardware circuit modularization clock switch controller |
| CN106990353A (en) * | 2017-05-09 | 2017-07-28 | 浙江英洛华新能源科技有限公司 | A kind of relay fault detecting circuit and the relay with the circuit |
| CN107275157A (en) * | 2017-07-24 | 2017-10-20 | 浙江英洛华新能源科技有限公司 | A kind of relay movement part detection circuit and the relay with the circuit |
| CN107402053A (en) * | 2017-08-07 | 2017-11-28 | 上海信通机电工程有限公司 | Two-wire system contact-type electronic level-sensing device |
| CN108119252A (en) * | 2018-01-02 | 2018-06-05 | 南通市玉翔光学元件有限公司 | A kind of diesel engine stops in emergency circuit and its implementation |
| CN208636402U (en) * | 2018-07-13 | 2019-03-22 | 浙江英洛华新能源科技有限公司 | Detect the electron assistant contact circuit of high-voltage relay contact on-off |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于霍尔传感器的继电器工作状态实时监视系统;宋文荣;《仪器仪表用户》;1-4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109031107A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109031107B (en) | Electronic auxiliary contact circuit for detecting on-off of high-voltage relay contact | |
| CN102544930B (en) | Leakage protection plug | |
| CN101835318B (en) | Intelligent detector of LED street lamp and working method thereof | |
| CN100483143C (en) | Magnet coil break detection circuit | |
| CN201859818U (en) | Power failure double color light indicator | |
| CN102176797A (en) | Merged illumination and emergent light-emitting diode (LED) fluorescent lamp | |
| CN202817702U (en) | Current leakage protection device | |
| CN208636402U (en) | Detect the electron assistant contact circuit of high-voltage relay contact on-off | |
| CN201750009U (en) | Household appliance leakage protection socket | |
| CN206894129U (en) | A kind of Intelligent control device | |
| CN217741584U (en) | Power strip with zero line disconnection protection function | |
| CN205484714U (en) | Circuit is listened to killer switch state | |
| CN202564707U (en) | Electric leakage protection plug | |
| CN109587890B (en) | Driver circuit of LED lamp | |
| CN203275565U (en) | Multifunctional grounding detector | |
| CN103137386A (en) | Power off indicator tube | |
| CN2877102Y (en) | Socket type grounding fault circuit breaker | |
| CN204719123U (en) | A kind of overvoltage undervoltage detection circuit | |
| CN204631177U (en) | A kind of single phase low voltage distribution system Fault Pre pick-up unit | |
| CN2909508Y (en) | GFCI with service life end indicating function | |
| CN202551420U (en) | Energy saving lamp illuminable after powering off power grid | |
| CN200973016Y (en) | Automatic overvoltage, overcharge and electric vehicle batter charge protector | |
| CN2852457Y (en) | Status display circuit | |
| CN219498415U (en) | Intelligent multifunctional socket | |
| CN101714774B (en) | Device for automatically switching AC-DC power supply of emergency lighting in transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |