CN115015744A - AC charging pile relay adhesion detection circuit - Google Patents
AC charging pile relay adhesion detection circuit Download PDFInfo
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- CN115015744A CN115015744A CN202210620963.6A CN202210620963A CN115015744A CN 115015744 A CN115015744 A CN 115015744A CN 202210620963 A CN202210620963 A CN 202210620963A CN 115015744 A CN115015744 A CN 115015744A
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- 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
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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Abstract
The invention discloses an adhesion detection circuit for an alternating current charging pile relay, which relates to the technical field of electronics, in particular to an adhesion detection circuit for an alternating current charging pile relay, and comprises a first isolation circuit, a voltage division circuit and an operational amplifier detection circuit, wherein the input end of the first isolation circuit is connected with the output end of a tested relay, the output end of the first isolation circuit is connected with the input end of the voltage division circuit, the output end of the voltage division circuit is connected with the input end of the operational amplifier detection circuit, and the output end of the operational amplifier detection circuit is connected with a processing module; zero line relay adhesion detection circuitry includes: the output end of the second isolation circuit is connected with the input end of the optical coupling circuit, and the output end of the optical coupling circuit is connected with the processing module; the invention simplifies the structure of the detection circuit and improves the reliability of the detection circuit and the detection accuracy of the zero line relay.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an adhesion detection circuit for an alternating current charging pile relay.
Background
Along with the rapid popularization of electric automobiles, a charging pile matched with the electric automobiles is also rapidly constructed, the safety of the charging pile is directly influenced by the working state of a relay of a core component in a control circuit of the charging pile, and if the relay is not timely and accurately detected due to adhesion faults in the operation process of the charging pile, the charging circuit is damaged; at present, the adhesion of a charging pile relay is mainly detected by judging whether the relay is adhered through a feedback contact signal of the relay, however, not all relays are provided with feedback contacts, and for the relay without the feedback contacts, an external circuit needs to be added to replace the feedback contacts of the relay, so that the detection circuit is relatively complex in structure and low in reliability; the adhesion detection of the zero line relay in the three-phase power is mainly to compare the voltages of the input end and the output end when the relay is switched off and switched on, and the voltage of the zero line to the ground is close to 0V, so that the adhesion detection of the zero line relay is inaccurate due to small pressure difference.
Disclosure of Invention
Based on this, it is necessary to provide an alternating-current charging stake relay adhesion detection circuitry to above-mentioned technical problem to solve prior art relay adhesion detection circuitry complicacy, the reliability is low, and zero line relay adhesion detects inaccurate problem.
Based on above-mentioned purpose, an alternating-current charging stake relay adhesion detection circuitry, its characterized in that includes:
the live wire relay adhesion detection circuit is used for outputting a live wire relay adhesion detection signal;
the zero line relay adhesion detection circuit is used for outputting a zero line relay adhesion detection signal;
the processing module is used for judging whether the live wire relay is adhered according to the live wire relay adhesion detection signal and judging whether the zero line relay is adhered according to the zero line relay adhesion detection signal;
the live wire relay adhesion detection circuit comprises a first isolation circuit, a voltage division circuit and an operational amplifier detection circuit, wherein the input end of the first isolation circuit is connected with the output end of the relay to be detected, the output end of the first isolation circuit is connected with the input end of the voltage division circuit, the output end of the voltage division circuit is connected with the input end of the operational amplifier detection circuit, and the output end of the operational amplifier detection circuit is connected with the processing module;
zero line relay adhesion detection circuitry includes: the second isolation circuit is used for inputting sampling voltage, the output end of the second isolation circuit is connected with the input end of the optical coupling circuit, and the output end of the optical coupling circuit is connected with the processing module.
The scheme has the following beneficial effects:
according to the invention, the relay of the alternating-current charging pile is adhered to the detection circuit, the input end is directly connected to the output end of the relay, a relay contact replacing circuit is not required to be arranged, the structure of the detection circuit is simplified, and the reliability of the detection circuit is improved; the zero line relay adhesion detection circuit adopts independent power supply, and the on-off of the detected zero line relay is utilized to control the on-off of the optical coupler, so that high and low levels are output at the output end of the zero line relay adhesion detection circuit; the adhesion detection accuracy of the zero line relay is improved by judging whether adhesion exists only by detecting on-off without detecting the pressure difference between two ends of the zero line relay.
Optionally, the first isolation circuit includes:
the output of the relay that awaits measuring is connected to the one end of first electric capacity, the other end of first electric capacity is connected bleeder circuit's input, first electric capacity is used for keeping apart sampling voltage.
Optionally, the voltage divider circuit includes:
n resistance, N > 1, N resistance is established ties in proper order, bleeder circuit is used for carrying out the partial pressure to the isolation voltage of isolation circuit output.
Optionally, a voltage stabilizing filter circuit is connected in series between the output end of the voltage dividing circuit and the ground, and the voltage stabilizing filter circuit includes:
the second capacitor, the first resistor and the voltage stabilizing diode are connected in parallel, and the cathode of the voltage stabilizing diode is connected with the output end of the voltage dividing circuit.
Optionally, the operational amplifier detection circuit includes:
the operational amplifier comprises an operational amplifier voltage division circuit, an operational amplifier and a filter circuit, wherein the input end of the operational amplifier voltage division circuit is connected with the output end of the voltage division circuit, and the output end of the operational amplifier voltage division circuit is connected with the positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the filter circuit.
Optionally, the operational amplifier voltage dividing circuit includes:
the voltage divider circuit comprises a third capacitor, a second resistor, a third resistor, a first diode and a second diode, wherein one end of the second resistor is connected with the output end of the voltage divider circuit, and the other end of the second resistor is connected with one end of the third resistor and the positive input end of the operational amplifier; the third capacitor is connected in parallel with the third resistor, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is grounded.
Optionally, the operational amplifier detection circuit further includes:
and the anode of the third diode is connected with the output end of the voltage division circuit, the cathode of the third diode is connected with one end of the second resistor, and the third diode is used for rectifying the current output by the voltage division circuit.
Optionally, the second isolation circuit includes:
the input end of the isolation relay is connected with the output end of the zero line relay, the output end of the isolation relay is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the input end of the optocoupler circuit.
Optionally, the optical coupling circuit includes:
the first terminal of the optical coupling module is connected with a power supply, and the second terminal of the optical coupling module is connected with the anode of the fourth diode; and the third terminal of the optical coupling module is connected with the input end of the optical coupling voltage division circuit, and the fourth terminal of the optical coupling module is grounded.
Optionally, the optical coupler voltage dividing circuit includes:
the circuit comprises a fourth resistor, a fifth resistor and a fourth capacitor, wherein one end of the fourth resistor is connected with a power supply, the other end of the fourth resistor is connected with one end of the fifth resistor and a third terminal of the optical coupling module, and the third terminal of the optical coupling module serves as the output end of the zero line relay adhesion detection circuit to output the zero line relay adhesion detection signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a circuit diagram of an adhesion detection circuit for an ac charging pile relay according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an ac charging pile according to an embodiment of the present invention;
fig. 3 is an adhesion detection circuit for an ac charging pile relay according to an embodiment of the present invention;
fig. 4 is an adhesion detection circuit for an ac charging pile relay according to an embodiment of the present invention;
the symbols are as follows:
1. the live wire relay is adhered with the detection circuit; 2. the zero line relay is adhered with the detection circuit; 3. a processing module; 11. a first isolation circuit; 12. a voltage dividing circuit; 13. an operational amplifier detection circuit; 14. a voltage stabilizing filter circuit; 131. an operational amplifier voltage division circuit; 132. a filter circuit; IC1A, operational amplifier; 21. a second isolation circuit; 22. an optocoupler circuit; 221. an optocoupler voltage division circuit; l1out, and the output voltage of the live wire relay; nout and zero line relay output voltage; l1DET and a live wire relay adhesion detection signal; NDET, zero line relay adhesion detection signal; VCC, power supply; GND and ground.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
In an embodiment, there is provided an adhesion detection circuit for an ac charging post relay as shown in fig. 1, including:
the live wire relay is adhered to the detection circuit 1, the zero line relay is adhered to the detection circuit 2, and the processing module 3 is arranged; live wire relay adhesion detection circuitry 1 includes first isolating circuit 11, bleeder circuit 12 and operational amplifier detection circuitry 13, the output of being surveyed the relay is connected to first isolating circuit 11's input, with input live wire relay output voltage L1out, bleeder circuit 12's input is connected to first isolating circuit 11's output, bleeder circuit 12's input is connected to bleeder circuit 12's output, operational amplifier detection circuitry 13's input is connected to bleeder circuit 12's output, processing module 3's input is connected to the output of operational amplifier detection circuitry 13, to processing module 3 input live wire relay adhesion detection signal L1 DET.
In one example, three identical live wire relay adhesion detection circuits 1 are provided to achieve relay adhesion detection on three live wires of three-phase power.
Zero line relay adhesion detection circuitry 2 includes: second isolating circuit 21, opto-coupler circuit 22, the output of being surveyed zero line relay is connected to second isolating circuit 21's input to input zero line relay output voltage Nout, and opto-coupler circuit 22's input is connected to second isolating circuit 21's output, and processing module 3's input is connected to opto-coupler circuit 22's output, to processing module 3 input zero line relay adhesion detection signal NDET.
Above-mentioned alternating-current charging stake relay adhesion detection circuitry's working process:
as shown in fig. 2, as an operation schematic diagram of the ac charging pile, the processing module 3 outputs control signals relayM of the relay K1, the relay K2, the relay K3, and the relay K4 to control simultaneous on and off of the relays.
(1) If the relay control signal relayM output by the processing module 3 is at a high level, the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are conducted under a normal state, the corresponding relay coil is electrified, the relay is attracted, and each relay outputs a normal voltage. If three live wire relay K1 take place the adhesion, then this relay K1 does not pick up, then: live wire relay output voltage L1out voltage is 0, it is 0 to export isolation voltage through first isolating circuit 11, it is 0 to export partial voltage after bleeder circuit 12, export live wire relay adhesion detection signal L1DET after the operational amplifier detection circuitry 13 and be the low level, this live wire relay adhesion detection signal L1DET inputs to processing module 3, with the detection signal threshold value comparison of predetermineeing, if the magnitude of voltage of live wire relay adhesion detection signal L1DET is less than predetermined detection signal threshold value, then judge this relay K1 adhesion.
If the zero line relay K4 is adhered, the relay K4 is not attracted, the output ends of the second isolating circuit 21 and the zero line relay are in a disconnected state, at the moment, a zero line relay adhesion detection signal NDET output by the optical coupling isolating circuit 22 is in a high level, the voltage value of the zero line relay adhesion detection signal NDET is compared with a preset detection signal threshold value, and if the voltage value of the zero line relay adhesion detection signal NDET is larger than the preset detection signal threshold value, the relay K4 is judged to be adhered.
(2) If the relay control signal relayM output by the processing module 3 is at a low level, the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are turned off in a normal state, the corresponding relay coil is not electrified, the relay is turned off, and each relay outputs 0 voltage. If three live wire relay K1 are adhered, the relay K1 is not disconnected, and then: live wire relay output voltage L1out voltage is 220V, through first isolating circuit 11 output isolation voltage, this isolation voltage exports partial voltage after bleeder circuit 12, this partial voltage exports live wire relay adhesion detection signal L1DET after operational amplifier detection circuitry 13 and is the high level, this live wire relay adhesion detection signal L1DET inputs to processing module 3, with the predetermined detection signal threshold value comparison, if the magnitude of voltage of live wire relay adhesion detection signal L1DET is greater than predetermined detection signal threshold value, then judge this relay K1 adhesion.
If the zero line relay K4 is adhered, the relay K4 is not disconnected, the output end of the second isolation circuit 21 and the output end of the zero line relay are in a connection state, at the moment, a zero line relay adhesion detection signal NDET output by the optical coupling isolation circuit 22 is in a low level, the voltage value of the zero line relay adhesion detection signal NDET is compared with a preset detection signal threshold value, and if the voltage value of the zero line relay adhesion detection signal NDET is smaller than the preset detection signal threshold value, the relay K4 is judged to be adhered.
The relay adhesion detection circuit of this embodiment has following characteristics:
the electric pile relay adhesion detection circuitry of alternating-current charging includes: the live wire relay is adhered with the detection circuit, the zero line relay is adhered with the detection circuit and the processing module, the input end of the first isolation circuit is directly connected to the output end of the relay, a relay contact replacing circuit is not required to be arranged, the structure of the detection circuit is simplified, and the reliability of the detection circuit is improved; the zero line relay adhesion detection circuit controls the on-off of the optical coupler by using the on-off of the detected zero line relay, and then outputs high and low levels at the output end of the zero line relay adhesion detection circuit; the adhesion detection accuracy of the zero line relay is improved by judging whether adhesion exists only by detecting on-off without detecting the pressure difference between two ends of the zero line relay.
In an embodiment, there is provided an adhesion detection circuit for an ac charging post relay as shown in fig. 3, including:
the device comprises a live wire relay adhesion detection circuit 1, a zero line relay adhesion detection circuit 2 and a processing module 3; the live wire relay adhesion detection circuit 1 comprises a first isolation circuit 11, a voltage division circuit 12, an operational amplifier detection circuit 13 and a voltage stabilization filter circuit 14, wherein the operational amplifier detection circuit 13 comprises an operational amplifier voltage division circuit 131, an operational amplifier IC1A, a filter circuit 132 and a diode D1; wherein, the output of the relay that awaits measuring is connected to first buffer circuit 11's input, and the input of bleeder circuit 12 is connected to buffer circuit 11's output, and bleeder circuit's output is connected the input of steady voltage filter circuit 14 and the input of operational amplifier detection circuitry 13, and the input of processing module 3 is connected to the output of operational amplifier detection circuitry 13 to processing module 3 input live wire relay adhesion detection signal L1 DET.
In this embodiment, the first isolation circuit 11 includes a capacitor CY1, one end of the capacitor CY1 is connected to the output end of the relay to be tested, and the other end of the capacitor CY1 is used as the output end of the first isolation circuit to output the isolation voltage.
As a further embodiment, CY1 of isolation circuit 11 may be replaced by a relay, by which isolation of the voltage is achieved; when the circuit normally works, the relay K1, the relay K2, the relay K3 and the relay K4 are closed, the relay can be in an off state, the whole circuit does not work, and the power consumption of the whole circuit is reduced.
The voltage dividing circuit 12 is provided with a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, and a resistor R7 in series, one end of the resistor R1 is used as an input end of the voltage dividing circuit 12 and is connected with an output end of the isolation circuit 11, and one end of the resistor R7 is used as an output end of the voltage dividing circuit 12.
In one example, the voltage divider circuit 12 is provided with N resistors in series, where N > 1.
In this embodiment, the filter circuit 14 includes: the circuit comprises a capacitor C7, a resistor R33 and a diode ZD3, wherein one end of the capacitor C7 is connected with one end of the resistor R7, and the other end of the capacitor C7 is grounded; the resistor R33 is connected with the resistor R7 in series and then grounded; the cathode of the diode ZD3 is connected to one end of the resistor R7, and the anode of the diode ZD3 is grounded.
In this embodiment, the operational amplifier voltage divider circuit 131 includes a resistor R8, a resistor R10, a capacitor C1, a diode D2, and a diode D7, wherein one end of the resistor R8 is connected to a cathode of the diode D1, and the other end of the resistor R8 is connected to one end of the capacitor C1 and one end of the resistor R10, and is connected to a positive input terminal of the operational amplifier IC 1A; the other end of the capacitor C1 and the other end of the resistor R10 are grounded; the cathode of the diode D2 is connected to the power supply, the anode of the diode D2 is connected to the cathode of the diode D7, and the anode of the diode D7 is grounded.
In this embodiment, the negative input terminal of the operational amplifier IC1A is connected to the output terminal and is connected to one end of the resistor R9, and the other end of the resistor R9 is connected to the input terminal of the filter circuit 132 and outputs the fire wire relay adhesion detection signal L1 DET.
In this embodiment, the filter circuit 132 includes a capacitor C2 and a resistor R11, and the capacitor C2 and the resistor R11 are connected in parallel to ground.
In one example, three identical live wire relay adhesion detection circuits 1 are provided to achieve relay adhesion detection on three live wires of three-phase power.
In this embodiment, zero line relay adhesion detection circuitry 2 includes second buffer circuit 21 and opto-coupler circuit 22, opto-coupler circuit includes opto-coupler module U1, opto-coupler bleeder circuit 221 and resistance R37, wherein, the output of zero line relay is connected to second buffer circuit 21's input, opto-coupler circuit 22's input is connected to second buffer circuit 21's output, processing module 3's input is connected to opto-coupler circuit 22's output, with zero line relay adhesion detection signal NDET to 3 input zero line relays of processing module.
In this embodiment, the second isolation circuit 21 includes a relay K8 and a diode D8, a terminal 3 of the relay K8 is connected to the output end of the zero line relay to be tested, and a terminal 4 of the relay K8 is connected to the cathode of the diode D8; the anode of the diode D8 is connected to the input of the optocoupler circuit 22.
In this embodiment, the optocoupler voltage divider circuit 221 includes a resistor R38, a resistor R39, and a capacitor C10, one end of the resistor R37 is connected to the power supply, the other end of the resistor R37 is connected to the terminal 1 of the optocoupler module U1, and the terminal 2 of the optocoupler module U1 is connected to the anode of the diode D8; one end of the resistor R38 is connected with a power supply, the other end of the resistor R38 is connected with a terminal 4 of the optocoupler module U1, and a terminal 3 of the optocoupler module U1 is grounded; and the capacitor C10 and the resistor R39 are connected in parallel and then connected between a terminal 4 and a terminal 3 of the optical coupling module U1, and the terminal 4 of the optical coupling module is used as the output end of the zero line relay adhesion detection circuit 2 to output a zero line relay adhesion detection signal NDET.
Above-mentioned alternating-current charging stake relay adhesion detection circuitry's working process:
as shown in fig. 2, which is a schematic diagram of the operation of the ac charging pile, the processing module 3 outputs control signals relayM of the relay K1, the relay K2, the relay K3, and the relay K4 to control the simultaneous on/off of the relays.
(1) If the relay control signal relayM output by the processing module 3 is at a high level, the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are conducted under a normal state, the corresponding relay coil is electrified, the relay is attracted, and each relay outputs a normal voltage. If three live wire relay K1 take place the adhesion, then this relay K1 does not pick up, then: the L1out voltage is 0, the output isolation voltage is 0 through the capacitor CY1 of the first isolation circuit 11, the output isolation voltage is 0 after voltage division through the series resistor on the voltage division circuit 12, the output divided voltage is 0, the divided voltage is subjected to voltage stabilization and filtering through the voltage stabilization filter circuit to filter out noise signals, and then is rectified through the diode D1, the rectified current flows into the ground through the resistor R8 and the resistor R10, a divided voltage is formed between the resistor R8 and the resistor R10 and is input to the positive input end of the operational amplifier IC1A, a signal output from the output end of the operational amplifier IC1A is subjected to the filter circuit 132, the live wire relay adhesion detection signal L1DET is output as a low level signal, the signal is input to the processing module 3 and is compared with a preset detection signal threshold, and if the voltage value of the live wire relay adhesion detection signal L1DET is smaller than the preset detection signal threshold, it is determined that the relay K1 is adhered.
If zero line relay K4 takes place the adhesion, promptly: the coil of the relay K4 is in a power-on state, the relay K4 is not attracted, the relay K4 is in a circuit-breaking state, the terminal 2 of the optical coupling module U1 cannot be connected with the ground through the diode D8, the terminal 4 and the terminal 3 of the optical coupling module U1 cannot form a channel, a power supply forms partial pressure through the resistor R38 and the resistor R39, namely, the adhesion detection signal NDET of the zero line relay is high level and is input to the processing module 3, the voltage value of the adhesion detection signal NDET of the zero line relay is compared with a preset detection signal threshold value, if the voltage value of the adhesion detection signal NDET of the zero line relay is larger than the preset detection signal threshold value, the adhesion of the relay K4 is judged.
(2) If the relay control signal relayM output by the processing module 3 is at a low level, the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are turned off in a normal state, the corresponding relay coil is not electrified, the relay is turned off, and the output voltage of each relay is 0. If three live wire relay K1 are adhered, the relay K1 is not disconnected, and then: the L1out voltage is 220V, the output isolation voltage is 220V through the capacitor CY1 of the first isolation circuit 11, after being divided by the series resistor of the voltage divider circuit 12, the divided voltage is output on the resistor R33, the divided voltage is stabilized and filtered by a voltage stabilizing and filtering circuit, noise signals are filtered out, then the voltage is rectified by a diode D1, the rectified current flows into the ground through a resistor R8 and a resistor R10, a voltage division is formed between the resistor R8 and the resistor R10 and inputted to the positive input terminal of the operational amplifier IC1A, after the signal outputted from the output terminal of the operational amplifier IC1A passes through the filter circuit 132, the output live wire relay adhesion detection signal L1DET is a high level signal, the signal is input to the processing module 3, and comparing the voltage value with a preset detection signal threshold value, and if the voltage value of the live wire relay adhesion detection signal L1DET is greater than the preset detection signal threshold value, judging that the relay K1 is adhered.
If zero line relay K4 takes place the adhesion, promptly: the coil of the relay K4 is in a non-energized state, the relay K4 is attracted, the relay K4 is in a connected state, the terminal 2 of the optical coupling module U1 is connected with the ground through the diode D8 and the relay K8, the terminal 4 of the optical coupling module U1 and the terminal 3 form a passage, namely the terminal 4 is grounded, and therefore a zero line relay adhesion detection signal NDET output by the terminal 4 is in a low level; and inputting the adhesion detection signal NDET of the zero line relay into the processing module 3, comparing the voltage value of the adhesion detection signal NDET of the zero line relay with a preset detection signal threshold, and if the voltage value of the adhesion detection signal NDET of the zero line relay is smaller than the preset detection signal threshold, judging that the relay K4 is adhered.
The relay adhesion detection circuit of this embodiment has following characteristics:
(1) the capacitor of the first isolation circuit is designed, one end of the capacitor is directly connected with the output end of the relay, a relay contact replacing circuit is not required to be arranged, the structure of the detection circuit is simplified, and the reliability of the detection circuit is improved;
(2) the voltage stabilizing filter circuit can filter out clutter in the sampled voltage, and prevent the clutter in the sampled voltage from influencing the relay adhesion detection signal, so that the detection result is more accurate;
(3) the zero line relay adhesion detection circuit controls the on-off of the optical coupling module by using the on-off of the detected zero line relay, so that a high level and a low level are output at the output end of the zero line relay adhesion detection circuit; the adhesion detection accuracy of the zero line relay is improved by judging whether adhesion exists only by detecting on-off without detecting the pressure difference between two ends of the zero line relay.
In an embodiment, there is provided an adhesion detection circuit for an ac charging post relay as shown in fig. 3, including:
the adhesion detection circuit comprises a first live wire relay adhesion detection circuit, a second live wire relay adhesion detection circuit, a third live wire relay adhesion detection circuit and a zero line relay adhesion detection circuit 2, wherein the circuit structure of the first live wire relay adhesion detection circuit is the same as that of the live wire relay adhesion detection circuit in the figure 3, and an isolation circuit 11, a voltage division circuit 12 and a voltage stabilization filter circuit 14 of the second live wire relay adhesion detection circuit are the same as those of the isolation circuit 11, the voltage division circuit 12 and the voltage stabilization filter circuit 14 of the first live wire relay adhesion detection circuit; the output of bleeder circuit 12 of second live wire relay adhesion detection circuitry and third live wire relay adhesion detection circuitry connects the output of bleeder circuit 12 of first live wire relay adhesion detection circuitry jointly for three routes live wire relay adhesion detection circuitry share operational amplifier detection circuitry 13 and processing module 3.
Above-mentioned alternating-current charging stake relay adhesion detection circuitry working process:
(1) the method comprises the steps that a relay in any one of three paths of live wire relay adhesion detection circuits is in adhesion fault, the corresponding live wire relay adhesion detection circuit collects output voltage of the relay which is in adhesion, the voltage passes through an isolation circuit 11 to output isolation voltage, passes through a voltage division circuit 12 to output divided voltage, passes through a voltage stabilization filter circuit 14 and then is input to an operational amplifier detection circuit 13 of a first live wire relay adhesion detection circuit, passes through the operational amplifier detection circuit 13 to output a live wire relay adhesion detection signal L1DET, the signal is input to a processing module 3 and is compared with a preset detection signal threshold value, if the processing module 3 outputs a relay control signal relayM which is high level, and the voltage value of the live wire relay adhesion detection signal L1DET is smaller than the preset detection signal threshold value, it is judged that the relay in the three paths of live wires is in adhesion; if the relay control signal relayM output by the processing module 3 is at a low level, and the voltage value of the live wire relay adhesion detection signal L1DET is greater than the preset detection signal threshold value at the moment, it is determined that the relay in the three live wires is adhered.
(2) The working process of the zero line relay adhesion detection circuit 2 is the same as that of the zero line relay adhesion detection circuit 2 in fig. 3, and is not described herein again.
The relay adhesion detection circuit of this embodiment has following characteristics:
the electric pile relay adhesion detection circuitry is filled in alternating-current, three routes live wire relay adhesion detection circuitry's sampling circuit will gather relay output voltage after isolation, partial pressure and filtering process, common input to the detection circuitry is put to fortune, put high level signal or low level signal that detection circuitry output corresponds through fortune, this circuit is only put detection circuitry with an fortune, processing module is only with an IO port, the circuit hardware use has been reduced, the circuit cost is reduced.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an alternating-current charging stake relay adhesion detection circuitry which characterized in that includes:
the live wire relay adhesion detection circuit is used for outputting a live wire relay adhesion detection signal;
the zero line relay adhesion detection circuit is used for outputting a zero line relay adhesion detection signal;
the processing module is used for judging whether the live wire relay is adhered according to the live wire relay adhesion detection signal and judging whether the zero line relay is adhered according to the zero line relay adhesion detection signal;
the live wire relay adhesion detection circuit comprises a first isolation circuit, a voltage division circuit and an operational amplifier detection circuit, wherein the input end of the first isolation circuit is connected with the output end of the relay to be detected, the output end of the first isolation circuit is connected with the input end of the voltage division circuit, the output end of the voltage division circuit is connected with the input end of the operational amplifier detection circuit, and the output end of the operational amplifier detection circuit is connected with the processing module;
zero line relay adhesion detection circuitry includes: the second isolation circuit is used for inputting sampling voltage, the output end of the second isolation circuit is connected with the input end of the optical coupling circuit, and the output end of the optical coupling circuit is connected with the processing module.
2. The adhesion detection circuit of the AC charging pile relay as recited in claim 1, wherein the first isolation circuit comprises:
the output of the relay that awaits measuring is connected to the one end of first electric capacity, the other end of first electric capacity is connected bleeder circuit's input, first electric capacity is used for keeping apart sampling voltage.
3. The ac charging post relay adhesion detection circuit of claim 1, wherein the voltage divider circuit comprises:
n resistance, N > 1, N resistance is established ties in proper order, bleeder circuit is used for carrying out the partial pressure to the isolation voltage of isolation circuit output.
4. The adhesion detection circuit of the alternating-current charging pile relay as claimed in claim 1, wherein a voltage stabilizing filter circuit is connected between the output end of the voltage dividing circuit and the ground in series, and the voltage stabilizing filter circuit comprises:
the second capacitor, the first resistor and the voltage stabilizing diode are connected in parallel, and the cathode of the voltage stabilizing diode is connected with the output end of the voltage dividing circuit.
5. The adhesion detection circuit of the alternating-current charging pile relay as claimed in claim 1, wherein the operational amplifier detection circuit comprises:
the operational amplifier comprises an operational amplifier voltage division circuit, an operational amplifier and a filter circuit, wherein the input end of the operational amplifier voltage division circuit is connected with the output end of the voltage division circuit, and the output end of the operational amplifier voltage division circuit is connected with the positive input end of the operational amplifier; the negative input end of the operational amplifier is connected with the output end of the operational amplifier, and the output end of the operational amplifier is connected with the filter circuit.
6. The adhesion detection circuit of the alternating-current charging pile relay as claimed in claim 5, wherein the operational amplifier voltage division circuit comprises:
the voltage divider circuit comprises a third capacitor, a second resistor, a third resistor, a first diode and a second diode, wherein one end of the second resistor is connected with the output end of the voltage divider circuit, and the other end of the second resistor is connected with one end of the third resistor and the positive input end of the operational amplifier; the third capacitor is connected in parallel with the third resistor, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is grounded.
7. The AC charging post relay adhesion detection circuit of claim 5, wherein the operational amplifier detection circuit further comprises:
and the anode of the third diode is connected with the output end of the voltage division circuit, the cathode of the third diode is connected with one end of the second resistor, and the third diode is used for rectifying the current output by the voltage division circuit.
8. The ac charging post relay adhesion detection circuit of claim 1, wherein the second isolation circuit comprises:
the input end of the isolation relay is connected with the output end of the zero line relay, the output end of the isolation relay is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the input end of the optocoupler circuit.
9. The ac charging post relay adhesion detection circuit of claim 8, wherein the optocoupler circuit comprises:
the first terminal of the optical coupling module is connected with a power supply, and the second terminal of the optical coupling module is connected with the anode of the fourth diode; and the third terminal of the optical coupling module is connected with the input end of the optical coupling voltage division circuit, and the fourth terminal of the optical coupling module is grounded.
10. The adhesion detection circuit of alternating current charging pile relay of claim 9, characterized in that, the opto-coupler bleeder circuit includes:
the power supply is connected to one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the fifth resistor and a third terminal of the optical coupling module, and the third terminal of the optical coupling module serves as the output end of the zero line relay adhesion detection circuit to output a zero line relay adhesion detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210620963.6A CN115015744A (en) | 2022-06-02 | 2022-06-02 | AC charging pile relay adhesion detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210620963.6A CN115015744A (en) | 2022-06-02 | 2022-06-02 | AC charging pile relay adhesion detection circuit |
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| CN115015744A true CN115015744A (en) | 2022-09-06 |
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| CN202210620963.6A Pending CN115015744A (en) | 2022-06-02 | 2022-06-02 | AC charging pile relay adhesion detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494384A (en) * | 2022-11-17 | 2022-12-20 | 合肥华思***有限公司 | Detection method and circuit for energy storage grid-connected PCS inverter side relay |
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
-
2022
- 2022-06-02 CN CN202210620963.6A patent/CN115015744A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494384A (en) * | 2022-11-17 | 2022-12-20 | 合肥华思***有限公司 | Detection method and circuit for energy storage grid-connected PCS inverter side relay |
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
| CN115963393B (en) * | 2022-12-28 | 2024-01-05 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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