CN211507519U - Relay contact state detection circuit, vehicle and high-voltage power distribution system - Google Patents
Relay contact state detection circuit, vehicle and high-voltage power distribution system Download PDFInfo
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- CN211507519U CN211507519U CN201922393954.4U CN201922393954U CN211507519U CN 211507519 U CN211507519 U CN 211507519U CN 201922393954 U CN201922393954 U CN 201922393954U CN 211507519 U CN211507519 U CN 211507519U
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Abstract
The utility model belongs to the technical field of the vehicle, a vehicle, high voltage distribution system and relay contact state detection circuitry thereof is provided. The utility model discloses in, through adopting including control circuit, first switch circuit, detection circuitry and second switch circuit's relay contact state detection circuitry, make first switch circuit switch-on or break off relay and rear end detection circuitry's route under control circuit and second switch circuit's control, the counter electromotive force of having avoided relay closure or disconnection to produce in the twinkling of an eye causes the impact to rear end low pressure detection circuitry, and then the relay of having solved traditional relay contact state detection circuitry existence can produce counter electromotive force when closure or disconnection, this counter electromotive force can cause the impact to the low pressure detection circuitry of rear end, cause the problem of circuit failure.
Description
Technical Field
The utility model belongs to the technical field of the vehicle, especially, relate to a relay contact state detection circuitry and vehicle, high-voltage distribution system.
Background
In an electric automobile, a high-voltage power distribution system is an on-off device between a high-voltage battery and high-voltage parts (a main drive, an oil pump, an air pump, a DCDC (direct current DC), a charger and the like), a relay is a key device for controlling high voltage through low voltage, the effectiveness of the high-voltage power distribution system is influenced by the quality of the relay, and further the control effectiveness of the automobile is influenced, namely when a relay contact fails, the high-voltage system of the whole automobile loses effective control, and therefore potential safety hazards exist in driving.
In order to eliminate potential safety hazards caused by relay contact faults, the relay contact states in a high-voltage distribution system of an electric automobile need to be detected so as to determine whether a relay is in fault. At present, the prior art mainly gives the relay through providing an auxiliary power supply to gather the voltage and the battery voltage of relay rear end and compare, be in closed or the off-state with discernment relay contact, and then compare relay contact state and relay control signal again, in order to confirm whether the relay contact is the adhesion or inefficacy.
However, the relay can generate back electromotive force when being closed or opened, and the back electromotive force can cause impact to the low-voltage detection circuit at the rear end, so that the circuit is failed, and further the contact state of the relay is judged wrongly, thereby affecting the safety of the whole vehicle system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a relay contact state detection circuitry and vehicle, high-voltage distribution system, the relay that aims at solving traditional relay contact state detection circuitry existence can produce back electromotive force when closed or disconnection, and this back electromotive force can cause the impact to the low pressure detection circuitry of rear end, causes the problem of circuit inefficacy.
The utility model discloses a realize like this, a relay contact state detection circuitry is connected with the relay, relay contact state detection circuitry includes: the circuit comprises a control circuit, a first switch circuit, a detection circuit and a second switch circuit;
the control circuit is connected with the detection circuit and the second switch circuit, is configured to generate a relay control signal to control the relay to be switched on or switched off, generates a detection starting signal after the relay is switched on or switched off for a preset time, and obtains the state of the relay according to the detection signal and the relay control information; the relay control signal carries the relay control information;
the second switch circuit is connected with the first switch circuit and is configured to generate a first switch control signal according to the detection starting signal;
the first switch circuit is connected with the detection circuit; configured to generate a second switch control signal in accordance with the first switch control signal;
the detection circuit is configured to generate a detection signal according to the second switch control signal.
Another object of the present invention is to provide a high voltage power distribution system, which includes the relay contact state detection circuit.
It is another object of the present invention to provide a vehicle including the relay contact state detection circuit.
The utility model discloses in, through adopting including control circuit, first switch circuit, detection circuitry and second switch circuit's relay contact state detection circuitry, make first switch circuit switch-on or break off relay and rear end detection circuitry's route under control circuit and second switch circuit's control, the counter electromotive force of having avoided relay closure or disconnection to produce in the twinkling of an eye causes the impact to rear end low pressure detection circuitry, and then the relay of having solved traditional relay contact state detection circuitry existence can produce counter electromotive force when closure or disconnection, this counter electromotive force can cause the impact to the low pressure detection circuitry of rear end, cause the problem of circuit failure.
Drawings
Fig. 1 is a schematic diagram of a module structure of a relay contact state detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a relay contact state detection circuit according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a relay contact state detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the implementations of the present invention is made with reference to the accompanying drawings:
fig. 1 shows a module structure of a relay contact state detection circuit 10 according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment are shown, and detailed descriptions are as follows:
as shown in fig. 1, a relay contact state detection circuit 10 provided in the embodiment of the present invention is connected to a relay 20, and includes a control circuit 101, a first switch circuit 102, a detection circuit 103, and a second switch circuit 104.
The control circuit 101 is connected with the detection circuit 103 and the second switch circuit 104, and is configured to generate a relay control signal to control the relay to be turned on or turned off, generate a detection start signal after the relay is turned on or turned off for a preset time, and obtain the state of the relay according to the detection signal and the relay control information; the relay control signal carries relay control information;
the second switch circuit 104 is connected to the first switch circuit 102, and configured to generate a first switch control signal according to the detection start signal;
the first switch circuit 102 is connected to the detection circuit 103; configured to generate a second switch control signal in accordance with the first switch control signal;
the detection circuit 103 is configured to generate a detection signal according to the second switch control signal.
In specific implementation, the preset time can be set according to needs, namely the preset time is set according to the principle that when the relay is switched off or switched on, the time spent on discharging back electromotive force generated by instant switching-on or switching-off is taken as the preset time; in addition, in the present embodiment, the control circuit 101 may be implemented by a processor having a digital logic processing capability, such as a microcontroller or a field programmable gate array.
In addition, the relay control signal is a switch control signal for controlling the relay to be closed or opened, the relay control information carried by the relay control signal is control information for controlling the relay and representing the actual closed state or opened state of the relay, the detection start signal is a start signal when detecting the contact state of the relay, and the detection signal is a signal corresponding to the closed state or opened state of the relay, which is detected by the detection circuit 103 and fed back to the control circuit 101. When the control circuit 101 acquires the two different switch states of the relay 20, the contact state of the relay 20 can be confirmed according to the two different switch states.
As described above, when the relay control information is that the control relay is closed and the detection signal generated by the detection circuit 103 is that the relay is opened, the relay contact failure is the relay state obtained by the control circuit 101, that is, if the actual state of the relay 20 obtained by the control circuit 101 is closed and the state of the relay fed back to the control circuit 101 by the detection circuit 103 is opened, the contact failure of the relay 20 is proved at this time. When the relay control information is that the control relay is opened, and the detection signal generated by the detection circuit 103 is a relay closing signal, the relay state obtained by the control circuit 101 is relay contact adhesion, that is, if the actual state of the relay 20 obtained by the control circuit 101 is opened, and the state of the relay fed back to the control circuit 101 by the detection circuit 103 is closed, it is proved that the contact of the relay 20 is adhered at this time, that is, the contact state of the relay 20 is an adhesion state at this time.
In this embodiment, by using the relay contact state detection circuit 10 including the control circuit 101, the first switch circuit 102, the detection circuit 103, and the second switch circuit 104, the first switch circuit 102 is controlled by the control circuit 101 and the second switch circuit 104 to switch on or off the path between the relay and the rear end detection circuit 103, so that the impact of the back electromotive force generated at the moment of closing or opening the relay on the rear end low voltage detection circuit is avoided, and further the erroneous judgment of the relay contact state is avoided, and the safety of the entire vehicle system is improved.
Further, as an embodiment of the present invention, as shown in fig. 2, the second switch circuit 104 includes: a switching assembly 104a and an isolation assembly 104 b.
The switch component 104a is connected with the isolation component 104b and the control circuit 101, and is configured to generate a third switch control signal according to the detection start signal;
the isolation component 104b is coupled to the first switch circuit 102 and configured to generate a first switch control signal based on the third switch control signal.
Specifically, the switch element 104a receives the detection start signal, generates a third control signal according to the detection start signal, and outputs the third control signal to the isolation element 104b, so that the isolation element 104b generates a first switch control signal according to the third switch control signal, and controls the on/off of the first switch circuit 102 according to the first switch control signal.
In this embodiment, through set up the second switch circuit 104 including switch module 104a and isolation component 104b in this relay contact state detection circuit 10, make this second switch circuit 104 and control circuit 101 combined action, with the route between control first switch circuit 102 switch-on or disconnection relay 20 and detection circuit 103, when avoiding the relay contact to open or break, the low-voltage detection circuit of rear end that the high pressure impact that produces causes the damage to detection circuit 103 promptly, and then can not damage this relay contact state detection circuit, the accuracy that the relay contact state detected has been improved, thereby improve whole car high-voltage system security performance, whole car safety has been guaranteed.
Further, as an embodiment of the present invention, as shown in fig. 3, the switch assembly 104a includes a first resistor R1, a first capacitor C1, and a first switch element Q1.
A first end of the first resistor R1 is an input end of the detection enable signal K2-EN of the switch element 104a, a second end of the first resistor R1 is connected to a first end of the first capacitor C1 and a base terminal of the first transistor Q1, an emitter of the first transistor Q1 is an output end of a third switch control signal of the switch element 104a, and a collector of the first transistor Q1 and a second end of the first capacitor C1 are commonly connected to a power ground.
In specific implementation, the first triode Q1 is realized by an N-type triode; it should be noted that, in other embodiments, the switching device of the first transistor Q1 may also be implemented by using other switching devices with a switching function, such as an N-type MOS transistor, which is not limited herein.
Further, as an embodiment of the present invention, as shown in fig. 3, the isolation component 104b includes a second resistor R2, a third resistor R3, a second capacitor C2, and a first photocoupler U1.
The first end of the second resistor R2 is connected to a first power supply, which can output a 5V working voltage, for example, the second end of the second resistor R2 is connected to the anode 1 of the first photocoupler U1, the cathode 2 of the first photocoupler U1 is an input end of a third switch control signal of the isolation component 104b, the collector 3 of the first photocoupler U1 and the second end of the second capacitor C2 together form an output end of the first switch control signal of the isolation component 104b, the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the first end of the third resistor R3 is connected to the first power supply.
Further, as an embodiment of the present invention, as shown in fig. 3, the first switch circuit 102 includes a field effect transistor Q2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first diode D1.
Specifically, the anode of the first diode D1 is connected to the relay 20, the cathode of the first diode D1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the source of the fet Q2, the gate of the fet Q2 is the first switch control signal input end of the first switch circuit 102, and the drain of the fet Q2 is the second switch control signal output end of the first switch circuit 102.
In specific implementation, the field effect transistor Q2 is realized by a P-type MOS transistor; it should be noted that, in other embodiments, the switching device of the fet Q2 may also be implemented by using other switching devices with switching function, such as a P-type triode, which is not limited herein.
Further, as an embodiment of the present invention, the detection circuit 103 includes a seventh resistor R7, an eighth resistor R8, and a second photocoupler U2.
The first end of the seventh resistor R7 is connected to the first switch circuit 102 and the anode 1 of the second photocoupler U2, the second end of the seventh resistor R7 is grounded to the cathode 2 of the second photocoupler U2, the collector 3 of the second photocoupler U2 is grounded, the emitter 4 of the second photocoupler U2 and the first end of the eighth resistor R8 jointly form the output end of the detection signal of the detection circuit 103, and the second end of the eighth resistor R8 is connected to the first power supply.
In the present embodiment, the drain of the field effect transistor Q2 of the first switch circuit 102 is connected to the first end of the seventh resistor R7 and the anode 1 of the second photocoupler U2, while in other embodiments, the drain of the field effect transistor Q2 of the first switch circuit 102 is directly connected to the power ground.
The operation principle of the relay contact state detection circuit 10 provided by the present invention is specifically explained below by taking the circuit shown in fig. 3 as an example, and the details are as follows:
as shown in fig. 3, the control circuit 101 generates a relay control signal and controls the relay 20 to close according to the relay control signal, at this time, the control circuit 101 acquires the relay control information carried by the relay control signal, i.e., controls the relay to close, and after delaying for a preset time, sends a detection enable signal K2-EN to the switch component 104a, the switch component 104a controls the first triode Q1 to be turned on after receiving the detection enable signal K2-EN, and when the first triode Q1 is turned on, the first triode Q1 pulls down the control terminal voltage of the fet Q2 through the first photocoupler U1 to control the fet Q2 to be turned on. When the fet Q2 is turned on, the voltage at the front end of the relay 20 is connected to the second photocoupler U2 via the diode D1, the resistor R4, the resistor R5, the resistor R6, and the fet Q2, so that the primary side of the second photocoupler U2 is connected and the secondary side is pulled down, and then a relay closing signal (a detection signal of a low level signal) is output to the control circuit 101, and it is determined that the contacts of the relay 20 are normal according to the relay control information for controlling the relay to be closed and the relay closing signal (a low level detection signal) for indicating the relay to be closed; in addition, when the voltage of the front end connected to the relay 20 flows into the second photocoupler U2 through the diode D1, the resistor R4, the resistor R5, the resistor R6 and the fet Q2, and if the second photocoupler U2 does not form a path, the detection circuit 103 outputs a relay opening signal (a detection signal of a high level signal) to the control circuit 101, the control circuit 101 determines that the contact state of the relay 20 is failed, that is, the relay has a contact failure fault, based on the relay control information for controlling the closing of the relay and the relay opening signal (the high level detection signal) for indicating the opening of the relay.
Further, the control circuit 101 generates a relay control signal and controls the relay 20 to be turned off according to the relay control signal, at this time, the control circuit 101 acquires relay control information carried by the relay control signal, that is, controls the relay to be turned off, and sends a detection enable signal K2-EN to the switch component 104a after delaying for a preset time, the switch component 104a controls the first triode Q1 to be turned on after receiving the detection enable signal K2-EN, and when the first triode Q1 is turned on, the first triode Q1 pulls down a control end voltage of the fet Q2 through the first photocoupler U1 to control the fet Q2 to be turned on. When the fet Q2 is turned on, since the voltage of the front end of the relay 20 that is connected to the second photocoupler U2 cannot flow into the second photocoupler U2 through the diode D1, the resistor R4, the resistor R5, the resistor R6, and the second switching element Q2, the detection module 103 directly feeds a relay off signal (a high-level detection signal) back to the control circuit 101, so that the control circuit 101 recognizes that the relay 20 is currently in an off state according to the fed back high-level detection signal, and determines that the contacts of the relay 20 are normal according to the relay control information for controlling the relay to be off and the relay off signal (a high-level detection signal) for indicating the relay to be off; in addition, when the voltage of the front end connected to the relay 20 flows into the second photoelectric coupler U2 through the diode D1, the resistor R4, the resistor R5, the resistor R6 and the second switching element Q2, the primary side of the second photoelectric coupler U2 is turned on, and the secondary side is pulled down, so that a relay closing signal (a low-level detection signal) is output to the control circuit 101, and the control circuit 101 determines that the contacts of the relay 20 are stuck according to relay control information for controlling the opening of the relay and a relay closing signal (a low-level detection signal) for representing the closing of the relay, that is, the relay has a contact sticking fault.
In this embodiment, the utility model discloses an adopt by simple device for example resistance, electric capacity, switch element, the switch circuit that photoelectric coupler constitutes, make switch control circuit under control circuit's control, after relay disconnection or switch on the preset time, control switch circuit switches on, so that rear end detection circuitry detects the contact state of relay, and then make detection circuitry can effectively avoid peak voltage when detecting, when avoiding the relay contact to open or break off, the high pressure impact of production causes the damage to the low pressure detection circuitry of rear end, and then can not damage this relay contact state detection circuitry, the accuracy that relay contact state detected has been improved, thereby improve whole car high-voltage system security performance, whole car safety has been guaranteed, and circuit structure is simple, and is with low costs.
Further, the utility model also provides a high voltage distribution system, this high voltage distribution system includes relay contact state detection circuitry 10. It should be noted that, because the relay contact state detection circuit 10 in the high voltage power distribution system provided by the embodiment of the present invention is the same as the relay contact state detection circuit 10 shown in fig. 1 to 3, the specific working principle of the relay contact state detection circuit 10 in the high voltage power distribution system provided by the embodiment of the present invention can refer to the foregoing detailed description about fig. 1 to 3, and is not repeated herein; furthermore, the utility model provides a high voltage distribution system's concrete structure and principle can refer to prior art, and it is no longer repeated here.
Further, the embodiment of the utility model provides a vehicle is still provided, this vehicle includes relay contact state detection circuit 10. It should be noted that, because the relay contact state detection circuit 10 in the vehicle provided in the embodiment of the present invention is the same as the relay contact state detection circuit 10 shown in fig. 1 to 3, the specific working principle of the relay contact state detection circuit 10 in the vehicle provided in the embodiment of the present invention can refer to the foregoing detailed description about fig. 1 to 3, and is not repeated here; furthermore, the present invention provides a specific structure and principle of a vehicle, which can refer to the prior art and will not be described herein.
The utility model discloses in, through adopting including control circuit, first switch circuit, detection circuitry and second switch circuit's relay contact state detection circuitry, make first switch circuit switch-on or break off relay and rear end detection circuitry's route under control circuit and second switch circuit's control, the counter electromotive force of having avoided relay closure or disconnection to produce in the twinkling of an eye causes the impact to rear end low pressure detection circuitry, and then the relay of having solved traditional relay contact state detection circuitry existence can produce counter electromotive force when closure or disconnection, this counter electromotive force can cause the impact to the low pressure detection circuitry of rear end, cause the problem of circuit failure.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a relay contact state detection circuitry, is connected with the relay, its characterized in that, relay contact state detection circuitry includes: the circuit comprises a control circuit, a first switch circuit, a detection circuit and a second switch circuit;
the control circuit is connected with the detection circuit and the second switch circuit, is configured to generate a relay control signal to control the relay to be switched on or switched off, generates a detection starting signal after the relay is switched on or switched off for a preset time, and obtains the state of the relay according to the detection signal and the relay control information; the relay control signal carries the relay control information;
the second switch circuit is connected with the first switch circuit and is configured to generate a first switch control signal according to the detection starting signal;
the first switch circuit is connected with the detection circuit; configured to generate a second switch control signal in accordance with the first switch control signal;
the detection circuit is configured to generate a detection signal according to the second switch control signal.
2. The relay contact state detection circuit according to claim 1, wherein the second switch circuit includes: a switch assembly and an isolation assembly;
the switch assembly is connected with the isolation assembly and the control circuit and is configured to generate a third switch control signal according to the detection starting signal;
the isolation component is coupled to the first switch circuit and configured to generate the first switch control signal based on the third switch control signal.
3. The relay contact state detection circuit of claim 2, wherein the switch assembly comprises a first resistor, a first capacitor, and a first transistor;
the first end of the first resistor is the input end of the detection starting signal of the switch component, the second end of the first resistor is connected with the first end of the first capacitor and the base end of the first triode, the emitter of the first triode is the output end of the third switch control signal of the switch component, and the collector of the first triode and the second end of the first capacitor are connected to the power ground in a shared mode.
4. The relay contact state detection circuit of claim 2, wherein the isolation component comprises a second resistor, a third resistor, a second capacitor, and a first optocoupler;
the first end of the second resistor is connected with the first power supply, the second end of the second resistor is connected with the anode of the first photoelectric coupler, the cathode of the first photoelectric coupler is the input end of a third switch control signal of the isolation assembly, the collector electrode of the first photoelectric coupler and the second end of the second capacitor jointly form the output end of the first switch control signal of the isolation assembly, the first end of the second capacitor is connected with the second end of the third resistor, and the first end of the third resistor is connected with the first power supply.
5. The relay contact state detection circuit according to any one of claims 1 to 4, wherein the first switch circuit includes a field effect transistor, a fourth resistor, a fifth resistor, a sixth resistor, and a first diode;
the anode of the first diode is connected with the relay, the cathode of the first diode is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the source electrode of the field-effect tube, the grid electrode of the field-effect tube is the first switch control signal input end of the first switch circuit, and the drain electrode of the field-effect tube is the second switch control signal output end of the first switch circuit.
6. The relay contact state detection circuit according to claim 4, wherein the detection circuit includes a seventh resistor, an eighth resistor, and a second photocoupler;
the first end of the seventh resistor is connected with the first switch circuit and the anode of the second photoelectric coupler, the second end of the seventh resistor is grounded with the cathode of the second photoelectric coupler, the collector of the second photoelectric coupler is grounded, the emitter of the second photoelectric coupler and the first end of the eighth resistor jointly form the output end of the detection signal of the detection circuit, and the second end of the eighth resistor is connected with the first power supply.
7. A high voltage power distribution system comprising a relay contact state detection circuit according to any one of claims 1 to 6.
8. A vehicle, characterized in that it comprises a high voltage power distribution system according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922393954.4U CN211507519U (en) | 2019-12-26 | 2019-12-26 | Relay contact state detection circuit, vehicle and high-voltage power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922393954.4U CN211507519U (en) | 2019-12-26 | 2019-12-26 | Relay contact state detection circuit, vehicle and high-voltage power distribution system |
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| Publication Number | Publication Date |
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| CN211507519U true CN211507519U (en) | 2020-09-15 |
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| CN201922393954.4U Active CN211507519U (en) | 2019-12-26 | 2019-12-26 | Relay contact state detection circuit, vehicle and high-voltage power distribution system |
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| Country | Link |
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| CN (1) | CN211507519U (en) |
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