CN219915852U - Relay adhesion detection circuit - Google Patents
Relay adhesion detection circuit Download PDFInfo
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- CN219915852U CN219915852U CN202320302569.8U CN202320302569U CN219915852U CN 219915852 U CN219915852 U CN 219915852U CN 202320302569 U CN202320302569 U CN 202320302569U CN 219915852 U CN219915852 U CN 219915852U
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- 230000008878 coupling Effects 0.000 claims description 6
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- 238000007493 shaping process Methods 0.000 claims description 5
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Abstract
The utility model discloses a relay adhesion detection circuit which comprises a capacitance isolation circuit, a resistor network, a filter circuit, an optocoupler isolation circuit, a power supply and an MCU detection unit, wherein commercial power alternating current inputs L_IN and N_IN and relay outputs N_OUT and L_OUT are used as signal inputs, and the signals are output to the MCU detection unit for signal detection after being shaped by the capacitance isolation circuit, the resistor network and the filter circuit. According to the utility model, the two loops are subjected to cross detection, the sine wave signal is converted into the square wave signal for MCU detection through the circuit, the adhesion detection signal can be directly input into the IO port of the MCU, the adhesion fault of the relay of which loop is specific can be identified through reading the level signal and the software algorithm, any adhesion can be detected, and the safety of the charging socket device is improved.
Description
Technical Field
The utility model belongs to the technical field of charging sockets of electric automobiles, and particularly relates to a relay adhesion detection circuit.
Background
In the field of new energy automobile alternating-current charging, with the release of new GB/T18487.1 standards and the importance of charging safety in the domestic new energy charging industry, a relay is needed inside charging equipment to control on-off of a live wire and a zero wire, so that power transmission of a primary loop is realized; this requires that the relay must be able to operate steadily for a long period of time, especially when contact adhesion appears, the system needs to be able to detect and report to the police and suggestion or stop charging to avoid the vehicle interface electrification that the unable disconnection of relay caused, safety risk such as personnel's electric shock, thereby improve charging equipment's safety in utilization.
At present, only part of European standard and outlet adopt the relay adhesion detection function, and generally adopt the following two schemes:
scheme one: the relay with the auxiliary contact for adhesion detection is adopted, a mechanical structure linkage device is arranged in the relay, when the contact is closed by adhesion, the contact can be closed/opened, and at the moment, a control system can judge whether the relay is in an adhesion state or not by detecting the switching state of the contact through an MCU;
however, at present, the relay type number is less, the general volume is larger, the cost is higher because of the built-in mechanical structure, and the failure risk is larger when the product falls and vibrates;
scheme II: the voltage sampling is carried out on the output side of the relay, so that when the relay is powered on and the relay is not closed for output, the voltage of the output side is detected to judge whether the relay is in an adhesion state or not;
by adopting the scheme, the detection circuit can only identify the adhesion condition of two relays, the adhesion of a single relay can not be identified, but if the adhesion exists in the single relay, potential safety hazards still exist, and the charging safety can not be ensured;
therefore, a relay adhesion detection circuit capable of accurately detecting and ensuring charging safety is required.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned shortcomings of the prior art, the present utility model aims to provide a relay adhesion detection circuit, which has the advantages of simple structure, small occupied PCB area, high precision and low cost, and can realize detection of specific relay adhesion, thereby effectively ensuring charging safety.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the relay adhesion detection circuit is connected with the first relay and the second relay respectively, and comprises a capacitance isolation circuit, a resistance network, a filter circuit, an optical coupling isolation circuit, a power supply and an MCU detection unit;
the first relay commercial power alternating current input L_IN, the second relay output N_OUT, the first relay output L_OUT and the second relay commercial power alternating current input N_IN are used as signal inputs, and are shaped through a capacitor isolation circuit, a resistor network and a filter circuit and then output to an MCU detection unit through an optocoupler isolation circuit and filter shaping for signal detection.
Further, the intelligent relay control device comprises a first detection circuit and a second detection circuit, wherein the input end of the first detection circuit is respectively connected with the first relay mains supply alternating current input L_IN and the second relay output N_OUT, and the input end of the second detection circuit is respectively connected with the first relay output L_OUT and the second relay mains supply alternating current input N_IN.
Further, the capacitance isolation circuit includes capacitances C2 and C5 of the first detection circuit and capacitances C7 and C10 of the second detection circuit, the capacitance C2 is connected with l_in, the capacitance C5 is connected with n_out, the capacitance C7 is connected with n_in, and the capacitance C10 is connected with l_out.
Further, the resistor network comprises an L loop resistor and an N loop resistor of the first detection circuit, one end of the L loop resistor is connected with the capacitor C2, the other end of the L loop resistor is connected with the optocoupler isolation circuit, one end of the N loop resistor is connected with the capacitor C5, and the other end of the N loop resistor is connected with the optocoupler isolation circuit.
Further, the optocoupler isolation circuit comprises an optocoupler U1 of the first detection circuit, and the optocoupler U1 comprises a light emitting device serving as an input side of the optocoupler isolation circuit and a light detecting device serving as an output side of the optocoupler isolation circuit; the power supply VCC is connected with one end of a light detecting device in the isolation circuit through a resistor R3, and the other end of the light detecting device is connected with GND.
Further, the resistor network further comprises a resistor R5 of the first detection circuit, one end of the resistor R5 is connected with a circuit between the L loop resistor and the optocoupler isolation circuit, and the other end of the resistor R5 is connected with a circuit between the L loop resistor and the optocoupler isolation circuit.
Further, the first detection circuit further includes a diode D1 connected in parallel with the resistor R5, the diode D1 and the input side of the optocoupler isolation circuit are connected in parallel, and the diode D1 performs filtering shaping on the input signal.
Further, the filter circuit comprises a resistor R4 and capacitors C3 and C4 of the first detection circuit, one end of the resistor R4 is connected with the output side of the optocoupler isolation circuit, and the other end of the resistor R4 is connected with an R1_CPU interface of the MCU detection unit and is connected with GND through the capacitors C3 and C4 which are connected in parallel.
Further, the circuit principle of the first detection circuit is the same as that of the second detection circuit.
Further, the resistor network comprises N resistors which are sequentially connected in series, and N is greater than or equal to 1.
The beneficial effects of the utility model are as follows:
the utility model has the advantages of fewer used components, simple layout, small occupied PCB area, high precision and low cost, can detect the adhesion of specific relays, and has stable and reliable scheme;
the live wire zero line input loop is isolated by adopting a capacitor, so that the insulation and voltage resistance of the product are not affected;
the relay adhesion detection circuit is located between a live wire output side and a zero line input side of the relay and between the live wire input side and the zero line output side of the relay, the first detection circuit and the second detection circuit are used for detecting in a crossing mode, sine wave signals are converted into square wave signals for MCU detection through the circuits, adhesion detection signals can be directly input into an IO port of the MCU, through reading level signals and a software algorithm, adhesion faults of the relay of which circuit can be identified, any adhesion can be detected, and therefore the adhesion of the specific relay can be detected, and an MCU control system is used for alarming and prompting, so that the safety of the charging socket device is improved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of the present utility model;
fig. 2 is a relay adhesion detection circuit of the present utility model.
Detailed Description
Specific examples are given below to further clarify, complete and detailed description of the technical scheme of the utility model. The present embodiment is a preferred embodiment based on the technical solution of the present utility model, but the scope of the present utility model is not limited to the following embodiments.
In the description of the present embodiment, the terms "inner", "outer", "front", "rear", "left", "right", etc. indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
Example 1:
the utility model is described in detail below with reference to the attached drawing figures:
referring to fig. 1 to 2, a relay adhesion detection circuit is connected with a first relay and a second relay respectively, and the detection circuit comprises a capacitance isolation circuit, a resistance network, a filter circuit, an optocoupler isolation circuit, a power supply and an MCU detection unit;
the first relay commercial power alternating current input L_IN, the second relay output N_OUT, the first relay output L_OUT and the second relay commercial power alternating current input N_IN are used as signal inputs, and are shaped through a capacitor isolation circuit, a resistor network and a filter circuit and then output to an MCU detection unit through an optocoupler isolation circuit and filter shaping for signal detection.
Wherein, L_OUT is the live wire output side of the relay, N_IN is the zero line input side of the relay, is the live wire L_IN line input side of the relay, is the N_OUT zero line output side of the relay.
The relay adhesion detection circuit comprises a first detection circuit and a second detection circuit, wherein the input end of the first detection circuit is respectively connected with the first relay mains supply alternating current input L_IN and the second relay output N_OUT, and the input end of the second detection circuit is respectively connected with the first relay output L_OUT and the second relay mains supply alternating current input N_IN.
The capacitor isolation circuit comprises capacitors C2 and C5 of a first detection circuit and capacitors C7 and C10 of a second detection circuit, wherein the capacitor C2 is connected with the L_IN, the capacitor C5 is connected with the N_OUT, the capacitor C7 is connected with the N_IN, and the capacitor C10 is connected with the L_OUT.
The resistor network comprises an L loop resistor and an N loop resistor of a first detection circuit, an L loop resistor and an N loop resistor of a second detection circuit, and the first detection circuit and the second detection circuit are subjected to cross detection;
furthermore, the resistor network is mainly used for reducing loop current and outputting a proper voltage signal at the same time, and can be composed of one or more resistors, namely an L loop resistor and an N loop resistor which comprise N resistors which are sequentially connected in series, wherein N is greater than or equal to 1, and a patch resistor and an insert resistor can be used.
One end of an L loop resistor of the first detection circuit is connected with L_IN through a capacitor C2, the other end of the L loop resistor of the first detection circuit is connected with an optical coupling isolation circuit, one end of an N loop resistor of the first detection circuit is connected with N_OUT through a capacitor C5, and the other end of the N loop resistor of the first detection circuit is connected with the optical coupling isolation circuit;
one end of the L loop resistor of the second detection circuit is connected with the N_IN through a capacitor C7, the other end of the L loop resistor of the second detection circuit is connected with the optical coupling isolation circuit, one end of the N loop resistor of the second detection circuit is connected with the L_OUT through a capacitor C10, and the other end of the N loop resistor of the second detection circuit is connected with the optical coupling isolation circuit.
Further, the capacitive isolation circuits may be placed one on each of the L, N loops, or one on each of the L, N loops, depending on the circuit design choice.
The resistor network further comprises a resistor R5 of the first detection circuit and a resistor R12 of the second detection circuit, one end of the resistor R5 is connected with a circuit between the L loop resistor of the first detection circuit and the optical coupler U1, and the other end of the resistor R5 is connected with a circuit between the L loop resistor of the first detection circuit and the optical coupler U1; one end of the resistor R12 is connected with a circuit between the L loop resistor of the second detection circuit and the optical coupler U2, and the other end of the resistor R12 is connected with a circuit between the L loop resistor of the second detection circuit and the optical coupler U2;
the first detection circuit further comprises a diode D1 connected with the resistor R5 in parallel, and the diode D1 is connected with the input side of the optical coupler U1 in parallel; the second detection circuit further comprises a diode D2 connected in parallel with the resistor R12, the diode D2 and the input side of the optocoupler U2 are connected in parallel, and the diodes D1 and D2 filter and shape the input signal.
The optical coupler isolation circuit comprises an optical coupler U1 of the first detection circuit and an optical coupler U2 of the second detection circuit, wherein the optical couplers U1 and U2 comprise a light emitting device serving as an input side of the optical coupler isolation circuit and a light detecting device serving as an output side of the optical coupler isolation circuit; the power supply VCC is connected with one end of a light detecting device in the isolation circuit through a resistor, and the other end of the light detecting device is connected with GND.
Furthermore, the optocoupler isolation circuit can adopt a common optocoupler, the light emitting device is a light emitting diode, the light detecting device is a phototriode, and the optocoupler isolation circuit is mainly used for signal isolation of strong and weak current, so that the control system works stably and reliably.
The filter circuit comprises a resistor R4 and capacitors C3 and C4 of the first detection circuit, one end of the resistor R4 is connected with the output side of the optocoupler isolation circuit, and the other end of the resistor R4 is connected with an R1_CPU interface of the MCU detection unit and is connected with GND through the capacitors C3 and C4 which are connected in parallel;
the filter circuit also comprises a resistor R11 and capacitors C8 and C9 of the second detection circuit, one end of the resistor R11 is connected with the output side of the optocoupler isolation circuit, and the other end of the resistor R11 is connected with an R2_CPU interface of the MCU detection unit and is connected with GND through the capacitors C8 and C8 which are connected in parallel. The filter shaping circuit is placed in the input and output of the optocoupler, is mainly used for filtering protection and port protection of signals, improves electromagnetic compatibility of products, and comprises but is not limited to RC filtering, LC filtering, diode clamping and other modes, which are simple reasoning of the method, and all the changes and improvements fall into the scope of the utility model claimed. When any one or more of the relay contacts are adhered, the waveform of the square wave signal can be generated at the input end of the isolation circuit after passing through the filter circuit.
Furthermore, if the three-phase alternating current input product (L1, L2, L3 and N) is adopted, the scheme can be directly expanded to detect the voltage of each phase of L1_OUT, L2_OUT, L3_OUT and N_IN or the voltage among the L1_OUT, L3_OUT and N_IN IN two groups of outputs of the two-way relay, and the relay adhesion of the three-phase product can be realized.
The working flow of the utility model is as follows:
step one: the product is powered by single-phase electricity, and self-inspection is carried out after the power-on;
step two: the MCU continuously detects an adhesion detection signal at the output side of the optocoupler;
step three: judging by a software algorithm, wherein the relay is IN an off state under a self-checking state, if the relay contact adhesion fault does not occur, the voltages between the L_OUT and the N_IN and between the N_OUT and the L_IN are 0, and the isolation circuit outputs a constant level signal; if the contacts of the K1 and K2 relays are stuck, alternating voltage exists between the L_OUT and the N_IN or between the N_OUT and the L_IN, and the corresponding isolation circuit outputs square wave signals. When the IO interface of the MCU detects the square wave signal, the adhesion fault of the K1 or K2 relay is judged;
step four: and after detecting the adhesion fault of the K1 or K2 relay, stopping charging by the charging equipment and carrying out fault indication.
In summary, the relay adhesion detection circuit is located between the live wire output side and the zero line input side of the relay and between the live wire input side and the zero line output side of the relay, converts sine wave signals into square wave signals for MCU detection, can realize adhesion state detection of any relay, and improves safety of a charging socket device.
The foregoing has outlined and described the features, principles, and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are merely illustrative of the principles of the present utility model, and that various changes and modifications may be made in the utility model without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. Relay adhesion detection circuitry, the circuit is connected its characterized in that with first relay, second relay respectively: the detection circuit comprises a capacitance isolation circuit, a resistance network, a filter circuit, an optical coupling isolation circuit, a power supply and an MCU detection unit;
the first relay commercial power alternating current input L_IN, the second relay output N_OUT, the first relay output L_OUT and the second relay commercial power alternating current input N_IN are used as signal inputs, and are shaped through a capacitor isolation circuit, a resistor network and a filter circuit and then output to an MCU detection unit through an optocoupler isolation circuit and filter shaping for signal detection.
2. The relay adhesion detection circuit of claim 1, wherein: the intelligent relay control circuit comprises a first detection circuit and a second detection circuit, wherein the input end of the first detection circuit is respectively connected with a first relay commercial power alternating current input L_IN and a second relay output N_OUT, and the input end of the second detection circuit is respectively connected with the first relay output L_OUT and the second relay commercial power alternating current input N_IN.
3. A relay adhesion detection circuit according to claim 2, wherein: the capacitance isolation circuit comprises capacitors C2 and C5 of a first detection circuit and capacitors C7 and C10 of a second detection circuit, wherein the capacitor C2 is connected with the L_IN, the capacitor C5 is connected with the N_OUT, the capacitor C7 is connected with the N_IN, and the capacitor C10 is connected with the L_OUT.
4. A relay adhesion detection circuit according to claim 2, wherein: the resistor network comprises an L loop resistor and an N loop resistor of the first detection circuit, one end of the L loop resistor is connected with the capacitor C2, the other end of the L loop resistor is connected with the optocoupler isolation circuit, one end of the N loop resistor is connected with the capacitor C5, and the other end of the N loop resistor is connected with the optocoupler isolation circuit.
5. A relay adhesion detection circuit according to claim 2, wherein: the optical coupler isolation circuit comprises an optical coupler U1 of the first detection circuit, wherein the optical coupler U1 comprises a light emitting device serving as an input side of the optical coupler isolation circuit and a light detecting device serving as an output side of the optical coupler isolation circuit; the power supply VCC is connected with one end of a light detecting device in the isolation circuit through a resistor R3, and the other end of the light detecting device is connected with GND.
6. The relay adhesion detection circuit of claim 4, wherein: the resistor network further comprises a resistor R5 of the first detection circuit, one end of the resistor R5 is connected with a circuit between the L loop resistor and the optocoupler isolation circuit, and the other end of the resistor R5 is connected with a circuit between the L loop resistor and the optocoupler isolation circuit.
7. The relay adhesion detection circuit of claim 6, wherein: the first detection circuit further comprises a diode D1 connected with the resistor R5 in parallel, the diode D1 and the input side of the optocoupler isolation circuit are connected in parallel, and the diode D1 filters and shapes an input signal.
8. A relay adhesion detection circuit according to claim 2, wherein: the filter circuit comprises a resistor R4 and capacitors C3 and C4 of the first detection circuit, one end of the resistor R4 is connected with the output side of the optocoupler isolation circuit, and the other end of the resistor R4 is connected with an R1_CPU interface of the MCU detection unit and is connected with GND through the capacitors C3 and C4 which are connected in parallel.
9. The relay adhesion detection circuit according to any one of claims 3 to 8, characterized in that: the circuit principle of the first detection circuit is the same as that of the second detection circuit.
10. The relay adhesion detection circuit of claim 9, wherein: the resistor network comprises N resistors which are sequentially connected in series, wherein N is greater than or equal to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320302569.8U CN219915852U (en) | 2023-02-24 | 2023-02-24 | Relay adhesion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320302569.8U CN219915852U (en) | 2023-02-24 | 2023-02-24 | Relay adhesion detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219915852U true CN219915852U (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320302569.8U Active CN219915852U (en) | 2023-02-24 | 2023-02-24 | Relay adhesion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219915852U (en) |
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2023
- 2023-02-24 CN CN202320302569.8U patent/CN219915852U/en active Active
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