CN113439215A - Relay detection circuit and detection device based on positive and negative poles - Google Patents
Relay detection circuit and detection device based on positive and negative poles Download PDFInfo
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- CN113439215A CN113439215A CN202080013170.7A CN202080013170A CN113439215A CN 113439215 A CN113439215 A CN 113439215A CN 202080013170 A CN202080013170 A CN 202080013170A CN 113439215 A CN113439215 A CN 113439215A
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- 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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Abstract
A relay detection circuit and a detection device based on positive and negative poles are disclosed, wherein the relay detection circuit comprises a power supply circuit, a positive pole relay detection circuit, a negative pole relay detection circuit and an auxiliary detection circuit; the power supply circuit comprises a power supply, electric equipment, a positive relay and a negative relay; the positive relay detection circuit comprises a first resistor, a second resistor, a third resistor and a first voltage sampling end; the negative relay detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor and a second voltage sampling end; the auxiliary detection circuit comprises a seventh resistor, an eighth resistor and a third voltage sampling end. The voltage of one sampling point is shared as a detection basis when the state of the positive relay and the state of the negative relay are detected, and the accuracy and the detection efficiency of detecting the positive relay and the negative relay are greatly improved.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a relay detection circuit and a detection device based on positive and negative electrodes.
Background
With the development of the technology, the relay is widely applied to the battery of the automobile and other related devices, the relay is often required to be detected in the charging scene, the existing technology generally judges by measuring the voltage of the low-voltage coil, but the method cannot accurately reflect the current state of the relay, and the steps are complicated, and the efficiency is not high.
Disclosure of Invention
In order to solve the problems, the application provides a relay detection circuit and a detection device based on positive and negative poles, and the accuracy and the detection efficiency of detecting the positive pole relay and the negative pole relay are greatly improved by sharing a sampling point voltage as a detection basis when the state of the positive pole relay and the state of the negative pole relay are detected.
The first aspect of the embodiment of the application discloses a relay detection circuit based on positive and negative electrodes, which comprises a power supply circuit, a positive relay detection circuit, a negative relay detection circuit and an auxiliary detection circuit; the power supply circuit comprises a power supply, electric equipment, a positive relay and a negative relay; the positive relay detection circuit comprises a first resistor, a second resistor, a third resistor and a first voltage sampling end; the negative relay detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor and a second voltage sampling end; the auxiliary detection circuit comprises a seventh resistor, an eighth resistor and a third voltage sampling end;
the positive pole of the power supply is connected with one end of the seventh resistor, one end of the first resistor, one end of the fourth resistor and one end of the positive relay, the other end of the seventh resistor is connected with one end of the eighth resistor and the third voltage sampling end, the other end of the positive relay is connected with one end of the third resistor and the positive electrode of the electric equipment, the other end of the third resistor is connected with the other end of the first resistor, one end of the second resistor and the first voltage sampling end, the other end of the fourth resistor is connected with one end of the fifth resistor, one end of the sixth resistor and the second voltage sampling end, the other end of the fifth resistor is connected with the other end of the second resistor, the other end of the eighth resistor, the negative electrode of the power supply and one end of the negative electrode relay, the other end of the negative relay is connected with the other end of the sixth resistor and the negative electrode of the electric equipment; the ratio of the resistance values of the eighth resistor to the seventh resistor, the ratio of the resistance values of the second resistor to the first resistor and the ratio of the resistance values of the fifth resistor to the fourth resistor are equal;
when the voltage of the third voltage sampling end is equal to the voltage of the first voltage sampling end, determining that the positive relay is disconnected; when the voltage of the third voltage sampling point end is larger than the voltage of the first voltage sampling end, determining that the positive relay is closed or adhered;
when the voltage of the third voltage sampling end is equal to the voltage of the second voltage sampling end, determining that the negative relay is disconnected; and when the voltage of the third voltage sampling end is greater than the voltage of the second voltage sampling end, determining that the negative relay is closed or adhered.
In one embodiment, the negative relay detection circuit further includes a first diode, the anode of the first diode is connected to the other end of the fourth resistor, one end of the fifth resistor, and the second voltage sampling terminal, and the cathode of the first diode is connected to one end of the sixth resistor.
In one embodiment, the positive and negative electrode-based relay detection circuit further includes a positive relay drive detection unit and a negative relay drive detection unit, the positive relay drive detection unit is connected to two ends of the positive relay and is used for detecting whether a drive signal exists in the positive relay, and the negative relay drive detection unit is connected to two ends of the negative relay and is used for detecting whether a drive signal exists in the negative relay.
In one embodiment, the positive and negative electrode-based relay detection circuit further includes a positive electrode relay failure determination unit and a negative electrode relay failure determination unit, the positive electrode relay failure determination unit is connected to the positive electrode relay drive detection unit and determines whether the positive electrode relay fails according to whether the positive electrode relay has a drive signal and a voltage relationship between a voltage of the first voltage sampling terminal and a voltage of the third voltage sampling terminal, and the negative electrode relay failure determination unit is connected to the negative electrode relay drive detection unit and determines whether the negative electrode relay fails according to whether the negative electrode relay has a drive signal and a voltage relationship between a voltage of the second voltage sampling terminal and a voltage of the third voltage sampling terminal.
In one embodiment, the relay detection circuit based on the positive electrode and the negative electrode further comprises a fault prompting unit, the fault prompting unit comprises a positive relay fault prompting unit and a negative relay fault prompting unit, the positive relay fault prompting unit is connected with the positive relay fault judging unit, and when the positive relay fault judging unit judges that the positive relay has a fault, the positive relay fault prompting unit sends out a fault prompt; the negative relay fault prompting unit is connected with the negative relay fault judging unit, and when the negative relay fault judging unit judges that the negative relay has a fault, the negative relay fault prompting unit sends a fault prompt.
In one embodiment, the positive and negative electrode-based relay detection circuit further includes a protection circuit, and the protection circuit is configured to limit the voltage magnitude of the first voltage sampling terminal, the second voltage sampling terminal, and the third voltage sampling terminal.
In one embodiment, the protection circuit includes a zener diode, an anode of the zener diode is connected to a cathode of the power supply, and a cathode of the zener diode is connected to the other end of the first resistor, the other end of the fourth resistor, or the other end of the seventh resistor.
In one embodiment, the protection circuit includes a power supply and a second diode, the power supply is connected to a cathode of the second diode, and an anode of the second diode is connected to the other end of the first resistor or the other end of the fourth resistor or the other end of the seventh resistor.
Further, the protection circuit further comprises a third diode, wherein the anode of the third diode is connected with the cathode of the power supply, and the cathode of the third diode is connected with the anode of the second diode.
The second aspect of the embodiment of the present application discloses a detection device, which includes the positive and negative electrode-based relay detection circuit described in the first aspect of the embodiment of the present application.
The relay detection circuit and the detection device based on the positive electrode and the negative electrode comprise a power supply circuit, a positive electrode relay detection circuit, a negative electrode relay detection circuit and an auxiliary detection circuit; the power supply circuit comprises a power supply, electric equipment, a positive relay and a negative relay; the positive relay detection circuit comprises a first resistor, a second resistor, a third resistor and a first voltage sampling end; the negative relay detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor and a second voltage sampling end; the auxiliary detection circuit comprises a seventh resistor, an eighth resistor and a third voltage sampling end. The voltage of one sampling point is shared as a detection basis when the state of the positive relay and the state of the negative relay are detected, and the accuracy and the detection efficiency of detecting the positive relay and the negative relay are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a relay detection circuit based on positive and negative electrodes in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another positive-negative-electrode-based relay detection circuit in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a protection circuit based on fig. 1 or fig. 2 in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another protection circuit based on fig. 1 or fig. 2 in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another protection circuit based on fig. 4 in the embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects, not for describing a particular order, or for indicating that different components are of different types. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by a person skilled in the art that the embodiments described herein can be combined with other embodiments, it being noted that the figures of the present application all incorporate power supply circuits, i.e. power supplies, consumers, positive and negative relays.
It should be noted that the closing of the relay means that the relay is turned on, and in appearance, the relay can be considered to be directly connected through a wire; sticking of the relay also means that the contacts are already engaged (meaning that current can flow), but the resistance may be greater. The biggest difference between relay closing and relay adhesion lies in whether the relay can respond to the instruction of opening the relay, and the relay is effectively cut off. The application scenario of the application relates to a relay between a power supply side and electric equipment, and the relay comprises a relay between a power battery and an On Board Charger (OBC) output, a relay between a storage battery and an OBC (direct current/direct current converter) output, a relay between the battery and a whole vehicle controller, a relay between the battery and a quick charging interface, a relay between a Parking Distance Control system (PDC) and a heater, a relay between an integrated motor Control and a DC/DC input, storage battery feeding and the like, wherein the voltage of the power supply side is a preset voltage value, and the voltage of the electric equipment side is zero.
Fig. 1 is a schematic structural diagram of a relay detection circuit based on positive and negative electrodes in an embodiment of the present application, where the relay detection circuit includes a power supply circuit, a positive relay detection circuit, a negative relay detection circuit, and an auxiliary detection circuit; the power supply circuit comprises a power supply DC1, an electric device DC2, a positive relay K1 and a negative relay K2; the positive relay detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first voltage sampling end AD-SMP 1; the negative relay detection circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a second voltage sampling end AD-SMP 2; the auxiliary detection circuit comprises a seventh resistor R7, an eighth resistor R8 and a third voltage sampling end AD-SMP 3.
Wherein, the connection mode of the circuit elements is as follows:
a positive electrode of the power source DC1 is connected to one end of the seventh resistor R7, one end of the first resistor R1, one end of the fourth resistor R4, and one end of the positive relay K1, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and the third voltage sampling terminal AD-SMP3, the other end of the positive relay K1 is connected to one end of the third resistor R3 and the positive electrode of the electrical device DC2, the other end of the third resistor R3 is connected to the other end of the first resistor R1, one end of the second resistor R2, and the first voltage sampling terminal AD-SMP1, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, one end of the sixth resistor R6, and the second voltage sampling terminal AD-2, the other end of the fifth resistor R5 is connected to the other end of the second resistor R2, and the other end of the eighth resistor R8, A negative electrode of the power supply DC1 and one end of the negative electrode relay K2, and the other end of the negative electrode relay K2 is connected to the other end of the sixth resistor R6 and the negative electrode of the electric device DC 2; the ratio of the resistances of the eighth resistor R8 and the seventh resistor R7, the ratio of the resistances of the second resistor R2 and the first resistor R1, and the ratio of the resistances of the fifth resistor R5 and the fourth resistor R4 are equal to each other.
Since the ratio of the eighth resistor R8 to the seventh resistor R7 is equal to the ratio of the second resistor R2 to the first resistor R1 and the ratio of the fifth resistor R5 to the fourth resistor R4, when the positive relay K1 is turned off, it is determined that the voltage of the first voltage sampling terminal AD-SMP1 is equal to the voltage of the third voltage sampling terminal AD-SMP3, and when the negative relay K2 is turned off, it is determined that the voltage of the second voltage sampling terminal AD-SMP2 is equal to the voltage of the third voltage sampling terminal AD-SMP 3; when the positive relay K1 is closed or stuck, the first resistor R1 is connected in parallel with the third resistor R3, so that the voltage at the first voltage sampling terminal AD-SMP1 is lower than the voltage at the third voltage sampling terminal AD-SMP3, and when the negative relay K2 is closed or stuck, the fifth resistor R5 is connected in parallel with the sixth resistor R6, so that the voltage at the second voltage sampling terminal AD-SMP2 is lower than the voltage at the third voltage sampling terminal AD-SMP 3.
The state of the positive relay K1 may be detected by comparing the voltage of the first voltage sampling terminal AD-SMP1 with the voltage of the third voltage sampling terminal AD-SMP3, and specifically, when the voltage of the third voltage sampling terminal AD-SMP3 is equal to the voltage of the first voltage sampling terminal AD-SMP1, the positive relay K1 is determined to be turned off; when the voltage of the third voltage sampling end AD-SMP3 is greater than the voltage of the first voltage sampling end AD-SMP1, determining that the positive relay K1 is closed or adhered; the voltage of the second voltage sampling terminal AD-SMP2 may be compared with the voltage of the third voltage sampling terminal AD-SMP3 to detect the state of the negative relay K2, and specifically, when the voltage of the third voltage sampling terminal AD-SMP3 is equal to the voltage of the second voltage sampling terminal AD-SMP2, the negative relay K2 may be determined to be turned off; and when the voltage of the third voltage sampling end AD-SMP3 is greater than the voltage of the second voltage sampling end AD-SMP2, determining that the negative relay K2 is closed or stuck.
Through above-mentioned relay detection circuitry, can share a sampling point voltage as detecting the basis when detecting the state of anodal relay and negative pole relay K2's state, promoted the accuracy and the detection efficiency who detect anodal relay and negative pole relay K2 greatly.
Fig. 2 is a schematic structural diagram of another positive-negative relay detection circuit in an embodiment of the present application, where the relay detection circuit includes a power supply circuit, a positive relay detection circuit, a negative relay detection circuit, and an auxiliary detection circuit; the power supply circuit comprises a power supply DC1, an electric device DC2, a positive relay K1 and a negative relay K2; the positive relay detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first voltage sampling end AD-SMP 1; the negative relay detection circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D1 and a second voltage sampling end AD-SMP 2; the auxiliary detection circuit comprises a seventh resistor R7, an eighth resistor R8 and a third voltage sampling end AD-SMP 3; the relay detection circuit further includes a positive relay drive detection unit 210, a negative relay drive detection unit 220, a positive relay fault determination unit 230, a negative relay fault determination unit 240, a positive relay fault presentation unit 250, and a negative relay fault presentation unit 260. It should be noted that, please refer to the circuit described in fig. 1 for the above-described connection manner and function of the electrical components, which are not described herein again.
A positive electrode of the first diode D1 is connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, and the second voltage sampling terminal AD-SMP2, and a negative electrode of the first diode D1 is connected to one end of the sixth resistor R6; the first diode D1 is used for some abnormal conditions, for example, when the positive relay K1 is closed and the negative relay K2 is opened, if the first diode D1 does not exist, the internal resistance of the electric equipment DC2 is connected in series with the sixth detection resistor R6 and then connected in parallel with the fourth resistor R4, so that detection errors can be caused, wrong judgment is formed, after the first diode D1 is added, when an abnormal condition occurs, the first diode D1 is not conducted in the reverse direction, so that the detection errors can not occur, and the potential safety hazard caused by the state error of the detection relay is greatly reduced.
The positive relay driving detection unit 210 is connected to both ends of the positive relay K1 and configured to detect whether a driving signal is present in the positive relay K1, and the negative relay driving detection unit 220 is connected to both ends of the negative relay K2 and configured to detect whether a driving signal is present in the negative relay K2.
The positive relay failure determination means 230 is connected to the positive relay drive detection means 210, and the connection represents a logical connection relationship, in actual connection, the positive relay failure determination unit 230 should also connect the first voltage sampling terminal AD-SMP1 and the third voltage sampling terminal AD-SMP3 at the same time, for judging whether the positive relay K1 has a fault according to the presence or absence of a driving signal in the positive relay K1, the voltage relationship between the voltage of the first voltage sampling terminal AD-SMP1 and the voltage of the third voltage sampling terminal AD-SMP3, and more particularly, when the voltage of the first voltage sampling terminal AD-SMP1 is equal to the voltage of the third voltage sampling terminal AD-SMP3, if the positive relay K1 has no driving signal, the positive relay K1 is determined to be normally disconnected; when the voltage of the first voltage sampling end AD-SMP1 is equal to the voltage of the third voltage sampling end AD-SMP3, if a driving signal exists in the positive relay K1, the positive relay K1 is determined to be abnormally disconnected; when the voltage of the first voltage sampling end AD-SMP1 is less than the voltage of the third voltage sampling end AD-SMP3, if the positive relay K1 does not have a driving signal, the positive relay K1 is determined to be adhered; when the voltage of the first voltage sampling end AD-SMP1 is less than the voltage of the third voltage sampling end AD-SMP3, if a driving signal exists in the positive relay K1, the positive relay K1 is determined to be normally closed;
the negative relay failure determining means 240 is connected to the negative relay drive detecting means 220, and the connection indicates a logical connection relationship, in actual connection, the negative relay failure determination unit 240 should also simultaneously connect the second voltage sampling terminal AD-SMP2 and the third voltage sampling terminal AD-SMP3, for judging whether the negative relay K2 has a fault according to the presence or absence of a driving signal in the negative relay K2, the voltage relationship between the voltage of the second voltage sampling terminal AD-SMP2 and the voltage of the third voltage sampling terminal AD-SMP3, and specifically, when the voltage of the second voltage sampling terminal AD-SMP2 is equal to the voltage of the third voltage sampling terminal AD-SMP3, if the negative relay K2 has no driving signal, the negative relay K2 is determined to be normally disconnected; when the voltage of the second voltage sampling end AD-SMP2 is equal to the voltage of the third voltage sampling end AD-SMP3, if a driving signal exists in the negative relay K2, the negative relay K2 is determined to be abnormally disconnected; when the voltage of the second voltage sampling end AD-SMP2 is less than the voltage of the third voltage sampling end AD-SMP3, if the negative relay K2 does not have a driving signal, the negative relay K2 is determined to be stuck; when the voltage of the second voltage sampling terminal AD-SMP2 is lower than the voltage of the third voltage sampling terminal AD-SMP3, if a driving signal is present in the negative relay K2, the negative relay K2 is determined to be normally closed.
Further, the fault prompting unit includes a positive relay fault prompting unit 250 and a negative relay fault prompting unit 260, the positive relay fault prompting unit 250 is connected to the positive relay fault judging unit 230, and when the positive relay fault judging unit 230 judges that the positive relay K1 has a fault, the positive relay fault prompting unit 250 gives a fault prompt; the negative relay failure presentation means 260 is connected to the negative relay failure determination means 240, and when the negative relay failure determination means 240 determines that the negative relay K2 has failed, the negative relay failure presentation means 260 issues a failure presentation. Alternatively, the fault indication means may be a flash, an alarm sound, or the like, and the fault indication unit may include any one of a warning light, an electroacoustic component, or a combination thereof.
Optionally, when the fault prompting unit is a warning light, the warning light may be turned on to indicate that a driving signal exists in the relay, and at this time, the relay is in a working state, and the warning light is turned off to indicate that the driving signal does not exist in the relay, and at this time, the relay is in a sleep state. It should be noted that the above embodiment is only one possible implementation manner, and does not constitute a limitation on the fault notification unit in the present application.
Through increasing the trouble suggestion unit, can make the user know the relay and produced the trouble and in time repair, reduced because of the emergence probability of relay trouble lead to the incident.
Fig. 3 is a schematic structural diagram of a protection circuit based on fig. 1 or fig. 2 in an embodiment of the present application, where the protection circuit is configured to limit voltage magnitudes of a first voltage sampling terminal, a second voltage sampling terminal, and a third voltage sampling terminal.
Optionally, the protection circuit includes a zener diode ZD, a positive electrode of the zener diode ZD is connected to a negative electrode of the power supply DC1, and a negative electrode of the zener diode ZD is connected to the other end of the first resistor R1, the other end of the fourth resistor R4, or the other end of the seventh resistor R7. The forward characteristic of the current-voltage characteristic curve of the zener diode ZD is similar to that of a normal diode, and the reverse characteristic is that when the reverse voltage is lower than the reverse breakdown voltage, the reverse resistance is large, the reverse leakage current is very small, and when the reverse voltage approaches the critical value of the reverse voltage, the reverse current suddenly increases, called breakdown, and at this critical breakdown point, the reverse resistance suddenly decreases to a very small value. The voltage across the zener diode ZD is substantially stabilized around the breakdown voltage despite the current varying over a wide range, thereby achieving the function of a protection circuit.
A voltage stabilizing diode serves as a protection circuit, so that the circuit space can be saved, and potential safety hazards and detection result errors caused by overlarge voltage can be prevented.
Optionally, the protection circuit may further include a power supply VCC and a second diode D2, as shown in fig. 4, fig. 4 is a schematic structural diagram of another protection circuit based on fig. 1 or fig. 2 in the embodiment of the present application, where the power supply VCC is connected to a cathode of the second diode D2, and an anode of the second diode D2 is connected to the other end of the first resistor R1, the other end of the fourth resistor R4, or the other end of the seventh resistor R7, so that damage to the sampling chip due to over-high voltage or reverse connection may be avoided.
Further, the protection circuit may further include a third diode D3, as shown in fig. 5, fig. 5 is a schematic structural diagram of another protection circuit based on fig. 4 in the embodiment of the present application, in which a positive electrode of the third diode D3 is connected to a negative electrode of the power supply DC1, and a negative electrode of the third diode D3 is connected to a positive electrode of the second diode D2, so that the protection range is further enhanced.
The embodiment of the present application further provides a detection device, which includes the positive and negative electrode-based relay detection circuit in the embodiment of the present application, and details are not repeated here.
In the following, a detailed description is made with reference to the above embodiments of the present disclosure on the working principle of the relay detection circuit based on positive and negative electrodes, when the first voltage sampling terminal AD-SMP1, the second voltage sampling terminal AD-SMP2, and the third voltage sampling terminal AD-SMP3 are measured, a sampling chip may be used to sample, the sampling chip may automatically obtain the voltage of the first voltage sampling terminal AD-SMP1 and the voltage of the third voltage sampling terminal AD-SMP3 and send the voltages to a positive electrode relay fault determination unit, meanwhile, the positive electrode relay driving detection unit may also automatically detect whether a driving signal exists in the positive electrode relay, and send the detection result to the positive electrode relay fault determination unit at regular time or in real time, and the positive electrode relay fault determination unit receives the voltage of the first voltage sampling terminal AD-SMP1 and the voltage of the third voltage sampling terminal AD-SMP3, Whether drive signal information exists in the positive relay or not is calculated and analyzed, a judgment result is output, and when abnormal disconnection or adhesion occurs, the positive relay fault judgment unit sends a warning instruction to the positive relay fault prompting unit, wherein the warning instruction can enable the positive relay fault prompting unit to send an alarm to a user; the sampling chip can automatically acquire the voltage of the second voltage sampling end AD-SMP2 and the voltage of the third voltage sampling end AD-SMP3 and send the voltages to the negative relay fault judgment unit, meanwhile, the cathode relay drive detection unit can automatically detect whether the drive signal exists in the cathode relay, and the detection result is sent to the negative relay fault judgment unit in a timing or real-time manner, the negative relay fault judgment unit receives the voltage of the second voltage sampling end AD-SMP2, the voltage of the third voltage sampling end AD-SMP3 and whether the negative relay has driving signal information or not, then calculation and analysis are carried out, the judgment result is output, when abnormal disconnection or adhesion occurs, the negative relay fault judgment unit sends a warning instruction to the negative relay fault prompting unit, and the warning instruction can enable the negative relay fault prompting unit to give an alarm to a user. In addition, the first voltage sampling end AD-SMP1, the second voltage sampling end AD-SMP2 and the third voltage sampling end AD-SMP3 can be connected with a protection circuit, and damage to a sampling chip caused by overhigh voltage or reverse connection is avoided.
While the preferred embodiments of the present application have been illustrated above with reference to the accompanying drawings, those skilled in the art can implement the present application in various modifications without departing from the scope and spirit of the present application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims and their equivalents.
Claims (10)
1. A relay detection circuit based on positive and negative electrodes is characterized by comprising a power supply circuit, a positive relay detection circuit, a negative relay detection circuit and an auxiliary detection circuit; the power supply circuit comprises a power supply, electric equipment, a positive relay and a negative relay; the positive relay detection circuit comprises a first resistor, a second resistor, a third resistor and a first voltage sampling end; the negative relay detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor and a second voltage sampling end; the auxiliary detection circuit comprises a seventh resistor, an eighth resistor and a third voltage sampling end;
the positive pole of the power supply is connected with one end of the seventh resistor, one end of the first resistor, one end of the fourth resistor and one end of the positive relay, the other end of the seventh resistor is connected with one end of the eighth resistor and the third voltage sampling end, the other end of the positive relay is connected with one end of the third resistor and the positive electrode of the electric equipment, the other end of the third resistor is connected with the other end of the first resistor, one end of the second resistor and the first voltage sampling end, the other end of the fourth resistor is connected with one end of the fifth resistor, one end of the sixth resistor and the second voltage sampling end, the other end of the fifth resistor is connected with the other end of the second resistor, the other end of the eighth resistor, the negative electrode of the power supply and one end of the negative electrode relay, the other end of the negative relay is connected with the other end of the sixth resistor and the negative electrode of the electric equipment; the ratio of the resistance values of the eighth resistor to the seventh resistor, the ratio of the resistance values of the second resistor to the first resistor and the ratio of the resistance values of the fifth resistor to the fourth resistor are equal;
when the voltage of the third voltage sampling end is equal to the voltage of the first voltage sampling end, determining that the positive relay is disconnected; when the voltage of the third voltage sampling point end is larger than the voltage of the first voltage sampling end, determining that the positive relay is closed or adhered;
when the voltage of the third voltage sampling end is equal to the voltage of the second voltage sampling end, determining that the negative relay is disconnected; and when the voltage of the third voltage sampling end is greater than the voltage of the second voltage sampling end, determining that the negative relay is closed or adhered.
2. The positive-negative electrode-based relay detection circuit according to claim 1, further comprising a first diode, wherein a positive electrode of the first diode is connected to the other end of the fourth resistor, one end of the fifth resistor and the second voltage sampling terminal, and a negative electrode of the first diode is connected to one end of the sixth resistor.
3. The positive-negative electrode-based relay detection circuit according to claim 1 or 2, further comprising a positive relay drive detection unit and a negative relay drive detection unit, wherein the positive relay drive detection unit is connected to two ends of the positive relay for detecting whether the positive relay has a drive signal, and the negative relay drive detection unit is connected to two ends of the negative relay for detecting whether the negative relay has a drive signal.
4. The positive-negative pole based relay detection circuit according to claim 3, the relay detection circuit also comprises a positive relay fault judgment unit and a negative relay fault judgment unit, the positive relay fault judgment unit is connected with the positive relay drive detection unit, judging whether the positive relay has a fault according to the voltage relation among the driving signal of the positive relay, the voltage of the first voltage sampling end and the voltage of the third voltage sampling end, wherein the negative relay fault judging unit is connected with the negative relay driving detection unit, and judging whether the negative relay has a fault according to whether the negative relay has a driving signal or not, and the voltage relation between the voltage of the second voltage sampling end and the voltage of the third voltage sampling end.
5. The relay detection circuit based on the positive electrode and the negative electrode of claim 4, further comprising a fault prompting unit, wherein the fault prompting unit comprises a positive relay fault prompting unit and a negative relay fault prompting unit, the positive relay fault prompting unit is connected with the positive relay fault judging unit, and when the positive relay fault judging unit judges that the positive relay has a fault, the positive relay fault prompting unit sends out a fault prompt; the negative relay fault prompting unit is connected with the negative relay fault judging unit, and when the negative relay fault judging unit judges that the negative relay has a fault, the negative relay fault prompting unit sends a fault prompt.
6. The positive and negative electrode-based relay detection circuit according to claim 5, further comprising a protection circuit for limiting the voltage magnitude of the first voltage sampling terminal, the second voltage sampling terminal and the third voltage sampling terminal.
7. The positive-negative pole based relay detection circuit according to claim 6, wherein the protection circuit comprises a zener diode, the positive pole of the zener diode is connected to the negative pole of the power supply, and the negative pole of the zener diode is connected to the other end of the first resistor or the other end of the fourth resistor or the other end of the seventh resistor.
8. The positive and negative electrode-based relay detection circuit according to claim 6, wherein the protection circuit comprises a power supply and a second diode, the power supply is connected to a negative electrode of the second diode, and an anode of the second diode is connected to the other end of the first resistor, the other end of the fourth resistor or the other end of the seventh resistor.
9. The positive-negative pole based relay detection circuit according to claim 8, wherein the protection circuit further comprises a third diode, an anode of the third diode is connected to a cathode of the power supply, and a cathode of the third diode is connected to an anode of the second diode.
10. A test device comprising a relay test circuit according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/122450 WO2022082497A1 (en) | 2020-10-21 | 2020-10-21 | Positive and negative electrodes-based relay detection circuit, and detection apparatus |
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| CN113439215A true CN113439215A (en) | 2021-09-24 |
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| 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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