CN219143040U - Adhesion detection circuit for AC charging pile relay - Google Patents
Adhesion detection circuit for AC charging pile relay Download PDFInfo
- Publication number
- CN219143040U CN219143040U CN202223369570.7U CN202223369570U CN219143040U CN 219143040 U CN219143040 U CN 219143040U CN 202223369570 U CN202223369570 U CN 202223369570U CN 219143040 U CN219143040 U CN 219143040U
- Authority
- CN
- China
- Prior art keywords
- resistor
- relay
- capacitor
- main power
- diode
- 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
- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 9
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 27
- 230000000737 periodic effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an adhesion detection circuit of an alternating-current charging pile relay, which relates to the technical field of adhesion detection control of relays and comprises a main power relay output control circuit and a relay adhesion detection circuit; the relay adhesion detection circuit comprises a capacitor C5, a resistor R11, a resistor R12, a diode D3, a resistor R13, a capacitor C6, a photoelectric coupler U1, +3.3V voltage end, an L_OUT end and an N_OUT end; the main POWER relay output control circuit comprises a diode D1, a diode D2, a main POWER relay K1, a main POWER relay K2, a triode Q1, a triode Q2, a capacitor C1, a capacitor C2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an OUT_POWER1 end, an OUT_POWER2 end, an L_IN end, an N_IN end, an L_OUT end, an N_OUT end and a +12V voltage end; the relay with auxiliary contacts is replaced by the relay adhesion detection circuit, so that the cost of the charging pile is reduced, and the design volume is reduced; the optical coupler is utilized to realize signal transmission and electrical isolation, and the circuit structure is simple, so that reliable safety isolation can be ensured.
Description
Technical Field
The utility model relates to the technical field of relay adhesion detection control, in particular to an alternating-current charging pile relay adhesion detection circuit.
Background
At present, the AC charging piles all require the contact adhesion detection function of the output relay, namely, before the AC charging piles charge the electric automobile, whether the contact adhesion fault occurs to the output relay needs to be confirmed, if the adhesion fault is detected, an alarm is sent to prohibit charging, so that the charging safety of a user is ensured.
The main defects are as follows: the prior art has two widely applied schemes, and the first scheme is to directly adopt a relay with auxiliary contacts, and can judge whether the main contacts of the relay are adhered or not by directly detecting the on-off state of the auxiliary contacts. The relay has large volume and high cost.
The second scheme is that the optocoupler is isolated and detected, and the situation that two paths of contacts of the output relay are adhered is detected, and the defect that only one path of relay contacts are adhered cannot be detected, so that potential safety hazards exist.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an adhesion detection circuit of an alternating current charging pile relay aiming at the defects of the background technology, and the relay adhesion detection circuit is used for replacing a relay with an auxiliary contact, so that the cost of the charging pile is reduced, and the design volume is reduced; the optical coupler is utilized to realize signal transmission and electrical isolation, and the circuit structure is simple, so that reliable safety isolation can be ensured.
The utility model adopts the following technical scheme for solving the technical problems:
an AC charging pile relay adhesion detection circuit comprises a main power relay output control circuit and a relay adhesion detection circuit;
the relay adhesion detection circuit comprises a capacitor C5, a resistor R11, a resistor R12, a diode D3, a resistor R13, a capacitor C6, a photoelectric coupler U1, +3.3V voltage end, an L_OUT end and an N_OUT end;
the N_OUT end is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a resistor R11, the other end of the resistor R11 is respectively connected with the cathode of a diode D3 and the 1 interface of a photoelectric coupler U1, the L_OUT end is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the anode of the diode D3 and the 2 interface of the photoelectric coupler U1, the 3 interface of the photoelectric coupler U1 is respectively connected with one end of a resistor R13 and one end of a capacitor C6, the other end of the resistor R13 and the other end of the capacitor C6 are respectively grounded, and the 4 interface of the photoelectric coupler U1 is connected with a +3.3V voltage end.
As a further preferable scheme of the adhesion detection circuit of the alternating-current charging pile relay, the output control circuit of the main POWER relay comprises a diode D1, a diode D2, a main POWER relay K1, a main POWER relay K2, a triode Q1, a triode Q2, a capacitor C1, a capacitor C2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an OUT_POWER1 end, an OUT_POWER2 end, an L_IN end, an N_IN end, an L_OUT end, an N_OUT end and a +12V voltage end;
the other end of the resistor R3 is respectively connected with one end of a resistor R5, one end of a capacitor C1 and a base electrode of a triode Q1, the other end of the resistor R5 and the other end of the capacitor C1 are grounded, an emitter electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is respectively connected with a 2 interface of a main POWER relay K1 and an anode of a diode D1, a cathode of the diode D1 is respectively connected with a 1 interface of the main POWER relay K1 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an N_IN end, and a 4 interface of the main POWER relay K1 is connected with an N_OUT end;
the OUT_POWER2 end is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a capacitor C2 and a base electrode of a triode Q2, the other end of the resistor R6 and the other end of the capacitor C2 are grounded, an emitter electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is respectively connected with a 2 interface of a main POWER relay K2 and an anode electrode of a diode D2, a cathode electrode of the diode D2 is respectively connected with a 1 interface of the main POWER relay K2 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an L_IN end, and a 4 interface of the main POWER relay K1 is connected with an L_OUT end.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the resistor R11 is a current limiting resistor.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the resistor R12 is a current limiting resistor.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the diode D3 is a protection diode.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the capacitor C5 is a direct-current blocking alternating-current capacitor.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the L_IN end and the N_IN end are respectively connected with an AC220V live wire and a zero wire.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the diode D1 is a freewheeling diode.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the diode D2 is a freewheeling diode.
As a further preferable scheme of the relay adhesion detection circuit of the alternating-current charging pile, the OUT_POWER1 end and the OUT_POWER2 end are connected with a singlechip.
Compared with the prior art, the technical scheme provided by the utility model has the following technical effects:
1. the relay adhesion detection circuit comprises a capacitor C5, a resistor R11, a resistor R12, a diode D3, a resistor R13, a capacitor C6, a photoelectric coupler U1, +3.3V voltage end, an L_OUT end and an N_OUT end, and the relay adhesion detection circuit is used for replacing a relay with an auxiliary contact, so that the cost of a charging pile is reduced, and the design volume is reduced;
2. the main POWER relay output control circuit comprises a diode D1, a diode D2, a main POWER relay K1, a main POWER relay K2, a triode Q1, a triode Q2, a capacitor C1, a capacitor C2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an OUT_POWER1 end, an OUT_POWER2 end, an L_IN end, an N_IN end, an L_OUT end, an N_OUT end and a +12V voltage end, wherein the transmission and the electrical isolation of signals are realized by utilizing an optocoupler, the circuit structure is simple, and the reliable safe isolation can be ensured;
3. when the master power RELAY K1 is controlled to suck, if the singlechip can detect a RELAY_CHK periodic square wave signal, the master power RELAY K2 can be determined to have adhesion fault, otherwise, the master power RELAY K2 is normal;
4. when the master power RELAY K2 is controlled to suck, if the singlechip can detect a RELAY_CHK periodic square wave signal, the master power RELAY K1 can be determined to have adhesion fault, otherwise, the master power RELAY K1 is normal; the problem that only one relay adhesion fault is undetectable is solved.
Drawings
FIG. 1 is a circuit diagram of a main power relay output control circuit of the present utility model;
fig. 2 is a relay adhesion detection circuit of the present utility model.
Detailed Description
The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
An AC charging pile relay adhesion detection circuit comprises a main power relay output control circuit and a relay adhesion detection circuit;
as shown in fig. 2, the relay adhesion detection circuit comprises a capacitor C5, a resistor R11, a resistor R12, a diode D3, a resistor R13, a capacitor C6, a photoelectric coupler U1, +3.3v voltage terminal, an l_out terminal, and an n_out terminal; the N_OUT end is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a resistor R11, the other end of the resistor R11 is respectively connected with the cathode of a diode D3 and the 1 interface of a photoelectric coupler U1, the L_OUT end is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the anode of the diode D3 and the 2 interface of the photoelectric coupler U1, the 3 interface of the photoelectric coupler U1 is respectively connected with one end of a resistor R13 and one end of a capacitor C6, the other end of the resistor R13 and the other end of the capacitor C6 are respectively grounded, and the 4 interface of the photoelectric coupler U1 is connected with a +3.3V voltage end. Through relay adhesion detection circuit, replace the relay of taking auxiliary contact for the cost of charging the stake reduces, reduces the design volume.
As shown IN fig. 1, the main POWER relay output control circuit includes a diode D1, a diode D2, a main POWER relay K1, a main POWER relay K2, a triode Q1, a triode Q2, a capacitor C1, a capacitor C2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an out_power1 terminal, an out_power2 terminal, an l_in terminal, an n_in terminal, an l_out terminal, an n_out terminal, and a +12v voltage terminal;
the other end of the resistor R3 is respectively connected with one end of a resistor R5, one end of a capacitor C1 and a base electrode of a triode Q1, the other end of the resistor R5 and the other end of the capacitor C1 are grounded, an emitter electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is respectively connected with a 2 interface of a main POWER relay K1 and an anode of a diode D1, a cathode of the diode D1 is respectively connected with a 1 interface of the main POWER relay K1 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an N_IN end, and a 4 interface of the main POWER relay K1 is connected with an N_OUT end;
the OUT_POWER2 end is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a capacitor C2 and a base electrode of a triode Q2, the other end of the resistor R6 and the other end of the capacitor C2 are grounded, an emitter electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is respectively connected with a 2 interface of a main POWER relay K2 and an anode electrode of a diode D2, a cathode electrode of the diode D2 is respectively connected with a 1 interface of the main POWER relay K2 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an L_IN end, and a 4 interface of the main POWER relay K1 is connected with an L_OUT end. The utility model realizes signal transmission and electrical isolation by utilizing the optocoupler, has simple circuit structure and can ensure reliable safety isolation.
Preferably, the resistor R11 is a current limiting resistor.
Preferably, the resistor R12 is a current limiting resistor.
Preferably, the diode D3 is a protection diode.
Preferably, the capacitor C5 is a dc blocking ac capacitor.
Preferably, the l_in end and the n_in end are respectively connected with an AC220V live wire and a zero wire.
Preferably, the diode D1 is a freewheeling diode.
Preferably, the diode D2 is a freewheeling diode.
Preferably, the out_POWER1 terminal and the out_POWER2 terminal are connected with a singlechip.
The OUT_POWER1 end and the OUT_POWER2 end are connected with the singlechip, and the L_IN end and the N_IN end are connected with the AC220V live wire and the zero wire. One end of the L_OUT is connected with an output contact of the main power relay K2, and the other end of the L_OUT is connected with R12; one end of the N_OUT is connected with an output contact of the main power RELAY K1, the other end of the N_OUT is connected with one end of the C5, and the RELAY_CHK is connected with the singlechip.
Under the condition that the RELAY has no adhesion fault, when the OUT_POWER1 and the OUT_POWER2 are at low level simultaneously or one of the OUT_POWER2 is at low level, the output contacts of the main POWER RELAY K1 and the main POWER RELAY K2 are all disconnected or one of the output contacts is disconnected, and the singlechip detects RELAY_CHK at low level; when OUT_POWER1 and OUT_POWER2 are high, the main POWER RELAY K1 and the main POWER RELAY K2 are short-circuited together with N_IN, the L_OUT is short-circuited together with L_IN, and the singlechip detects a RELAY_CHK periodic square wave signal.
From the analysis, it can be concluded that when the main power RELAY K1 and the main power RELAY K2 are not controlled to be attracted, the singlechip detects the periodic square wave signal of RELAY_CHK, which represents that the output contacts of the main power RELAY K1 and the main power RELAY K2 are adhered to each other. However, when one of the main power RELAY K1 and the main power RELAY K2 has adhesion failure, the singlechip detects RELAY_CHK low level, and can not judge that adhesion occurs on one of the main power RELAY K1 and the main power RELAY K2. This is a defect in the conventional optocoupler isolation detection, and when one of the two main power relays has an adhesion fault, the adhesion cannot be detected.
According to the utility model, on the premise of not changing the RELAY adhesion detection circuit in the diagram (2), when the main power RELAY K1 is controlled to be attracted, if the singlechip can detect the RELAY_CHK periodic square wave signal, the adhesion fault of the main power RELAY K2 can be determined, and otherwise, the main power RELAY K2 is normal. When the main power RELAY K2 is controlled to be sucked, if the singlechip can detect the RELAY_CHK periodic square wave signal, the adhesion fault of the main power RELAY K1 can be determined, and otherwise, the main power RELAY K1 is normal. The problem that only one relay adhesion fault is undetectable is solved.
While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.
Claims (10)
1. An alternating-current charging stake relay adhesion detection circuit which characterized in that: the relay adhesion detection circuit comprises a main power relay output control circuit and a relay adhesion detection circuit;
the relay adhesion detection circuit comprises a capacitor C5, a resistor R11, a resistor R12, a diode D3, a resistor R13, a capacitor C6, a photoelectric coupler U1, +3.3V voltage end, an L_OUT end and an N_OUT end;
the N_OUT end is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with one end of a resistor R11, the other end of the resistor R11 is respectively connected with the cathode of a diode D3 and the 1 interface of a photoelectric coupler U1, the L_OUT end is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the anode of the diode D3 and the 2 interface of the photoelectric coupler U1, the 3 interface of the photoelectric coupler U1 is respectively connected with one end of a resistor R13 and one end of a capacitor C6, the other end of the resistor R13 and the other end of the capacitor C6 are respectively grounded, and the 4 interface of the photoelectric coupler U1 is connected with a +3.3V voltage end.
2. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: the main POWER relay output control circuit comprises a diode D1, a diode D2, a main POWER relay K1, a main POWER relay K2, a triode Q1, a triode Q2, a capacitor C1, a capacitor C2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an OUT_POWER1 end, an OUT_POWER2 end, an L_IN end, an N_IN end, an L_OUT end, an N_OUT end and a +12V voltage end;
the other end of the resistor R3 is respectively connected with one end of a resistor R5, one end of a capacitor C1 and a base electrode of a triode Q1, the other end of the resistor R5 and the other end of the capacitor C1 are grounded, an emitter electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is respectively connected with a 2 interface of a main POWER relay K1 and an anode of a diode D1, a cathode of the diode D1 is respectively connected with a 1 interface of the main POWER relay K1 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an N_IN end, and a 4 interface of the main POWER relay K1 is connected with an N_OUT end;
the OUT_POWER2 end is connected with one end of a resistor R4, the other end of the resistor R4 is respectively connected with one end of a resistor R6, one end of a capacitor C2 and a base electrode of a triode Q2, the other end of the resistor R6 and the other end of the capacitor C2 are grounded, an emitter electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is respectively connected with a 2 interface of a main POWER relay K2 and an anode electrode of a diode D2, a cathode electrode of the diode D2 is respectively connected with a 1 interface of the main POWER relay K2 and a +12V voltage end, a 3 interface of the main POWER relay K1 is connected with an L_IN end, and a 4 interface of the main POWER relay K1 is connected with an L_OUT end.
3. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: the resistor R11 is a current limiting resistor.
4. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: the resistor R12 is a current limiting resistor.
5. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: the diode D3 is a protection diode.
6. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: the capacitor C5 is a direct current blocking alternating current capacitor.
7. The ac charging stake relay adhesion detection circuit as recited in claim 1, wherein: and the L_IN end and the N_IN end are respectively connected with an AC220V live wire and a zero wire.
8. The ac charging stake relay adhesion detection circuit as recited in claim 2, wherein: the diode D1 is a freewheeling diode.
9. The ac charging stake relay adhesion detection circuit as recited in claim 2, wherein: the diode D2 is a freewheeling diode.
10. The ac charging stake relay adhesion detection circuit as recited in claim 2, wherein: the OUT_POWER1 end and the OUT_POWER2 end are connected with a singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223369570.7U CN219143040U (en) | 2022-12-15 | 2022-12-15 | Adhesion detection circuit for AC charging pile relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223369570.7U CN219143040U (en) | 2022-12-15 | 2022-12-15 | Adhesion detection circuit for AC charging pile relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219143040U true CN219143040U (en) | 2023-06-06 |
Family
ID=86567928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223369570.7U Active CN219143040U (en) | 2022-12-15 | 2022-12-15 | Adhesion detection circuit for AC charging pile relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219143040U (en) |
-
2022
- 2022-12-15 CN CN202223369570.7U patent/CN219143040U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108680793A (en) | A kind of pure electric automobile insulating resistor detecting circuit and its detection method | |
| CN110470037B (en) | Anti-reverse connection circuit, method and device for power line of variable frequency air conditioner and air conditioner | |
| CN112578273A (en) | Adhesion detection device and method for alternating current circuit relay and alternating current charging pile | |
| CN111474501B (en) | Fill ground signal detection circuitry of electric pile | |
| CN106787058A (en) | A kind of reception terminal protecting circuit and charging equipment charged for battery | |
| CN219143040U (en) | Adhesion detection circuit for AC charging pile relay | |
| CN112433149B (en) | Relay failure detection device and method for single-phase photovoltaic grid-connected inverter | |
| CN111452640B (en) | Electric charging gun homing detection circuit and method | |
| CN211530726U (en) | Overvoltage protection circuit and instrument terminal | |
| CN205273211U (en) | Stake of intelligence alternating -current charging | |
| CN209311636U (en) | Relay high-voltage end adhesion detection circuit and electric car charging gun | |
| CN112290519B (en) | High-reliability ground wire live detection protection circuit | |
| CN213585143U (en) | High-reliability ground wire live detection protection circuit | |
| CN115792596A (en) | AC charging pile relay adhesion detection circuit | |
| CN210273844U (en) | Take relay real-time detection's converter circuit and converter | |
| CN105322499B (en) | A kind of short-circuit protection circuit abnormal based on power source loads | |
| CN212255590U (en) | Elevator door lock detection circuit | |
| CN211086520U (en) | Relay adhesion detection circuit and device | |
| CN105591430A (en) | Intelligent wire-connection control device | |
| CN220552952U (en) | Relay detection device of charging pile and charging pile | |
| CN220894434U (en) | High-voltage interlocking detection circuit | |
| CN205016992U (en) | Safe type guide control circuit of mining essence | |
| CN220019809U (en) | Relay adhesion detection circuit of alternating-current charging pile | |
| CN108318834A (en) | communication power supply detection circuit based on comparator | |
| CN214622954U (en) | Detection system for contact adhesion of PCB board relay for alternating-current charging stake |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |