CN210835161U - Relay adhesion detecting system - Google Patents
Relay adhesion detecting system Download PDFInfo
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- CN210835161U CN210835161U CN201921635555.8U CN201921635555U CN210835161U CN 210835161 U CN210835161 U CN 210835161U CN 201921635555 U CN201921635555 U CN 201921635555U CN 210835161 U CN210835161 U CN 210835161U
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Abstract
The utility model discloses a relay adhesion detecting system for whether the relay adhesion among the detection bilateral control circuit, including connecting the first detection circuitry between load and main positive relay and connecting the second detection circuitry between load and main negative relay, second detection circuitry, including current-limiting unit, one-way conduction unit, the first end of current-limiting unit divides two the tunnel, connects all the way between load and main negative relay, and another way is connected in the one-way negative termination end that switches on the unit, and the one-way conduction termination detection power that switches on of unit, the second end of current-limiting unit constitute the second sampling point. The two detection circuits of the utility model are relatively independent, the high-voltage circuit is simplified, the abnormal diagnosis of the random sequence on/off of the main positive relay and the main negative relay can be realized, the logic is simple, and the misjudgment rate is low; the second detection circuit increases IO state judgment, and improves the flexibility and the universality of the detection system; the whole detection system has simple circuit and low cost.
Description
Technical Field
The utility model relates to a relay detection area especially relates to a relay adhesion detecting system.
Background
Relays are used in electrical and electronic applications, mainly to close/open load/signal paths, and generally, the closing/opening of paths is divided into two basic ways: first, as shown in fig. 1, a relay K1 is connected between the load R1 and the positive pole of the main power supply V2, and the control of the high side of the load R1 is realized by closing/opening the connection between the load R1 and the positive pole of the main power supply V2, and the relay K1 in this connection form is a main positive relay; in a second mode, as shown in fig. 2, a relay K2 is connected between the load R and the negative electrode of the main power supply V2, and the control of the low side of the load R1 is realized by closing/opening the connection between the load R1 and the negative electrode of the main power supply V2, and the relay K2 in this connection form is a main negative relay. In the prior art, in order to ensure that the load R1 and the positive and negative poles of the main power supply V2 have a double-sided safety cut-off, the two modes are combined to form a double-sided control circuit, as shown in fig. 3.
Because of the restriction of the relay material and the process, the service life of the relay is limited, and the service life is prolonged, the relay is easy to adhere and malfunction, so that circuit faults are caused, and even elements are burnt out, such as: the service life of the signal relay is about 100 ten thousand times; the service life of the power relay or the high-voltage relay is about 10 ten thousand times. Therefore, the service life of the relay cannot be exceeded regardless of whether the relay is used for closing/opening the load path or the signal path, and in the process of actually using the relay, it is necessary to determine whether the closed/opened state of the relay meets the system requirement, that is, it is necessary to detect whether the relay is stuck or normally closed/opened.
Traditional relay adhesion detecting system mainly divides into two kinds:
first, as shown in fig. 4, a special relay K ' having an auxiliary contact or multiple contacts is used to control the on/off of a load R1, specifically, the special relay K ' includes a main contact located on the right side and an auxiliary contact located on the left side and synchronized with the main contact, the auxiliary contact is connected with a judgment module S, and the judgment module S judges the auxiliary contact to further achieve the purpose of judging whether the special relay K ' is adhered. The detection system needs to adopt a special relay K', and has the defects of high cost, poor universality, high misjudgment rate and the like;
in the second detection system, as shown in fig. 5, a first detection circuit S1 is led out between a load R1 and a main positive relay K1, and a second detection circuit S2 is led out between a load R1 and a main negative relay K2, specifically, the first detection circuit S1 includes a second resistor R2 and a third resistor R3, a first end of the second resistor R2 is connected between the load R1 and the main positive relay K1, a second end of the second resistor R2 is grounded through the third resistor R3, and a voltage division node between the second resistor R2 and the third resistor R3 forms a first sampling point 1; the second detection circuit S2 includes a fourth resistor R4 and a fifth resistor R5, a first end of the fourth resistor R4 is connected between the load R1 and the main negative relay K2, a second end of the fourth resistor R4 is grounded through the fifth resistor R5, and a voltage division node between the fourth resistor R4 and the fifth resistor R5 forms a second sampling point 2; and then collecting voltage analog quantities at the two sampling points, and judging whether the corresponding relays are adhered or not by judging the magnitude of the voltage analog quantities. The high-voltage circuit of the detection system is complex, only a voltage analog quantity judgment mode is provided, and whether the main and negative relays K2 are adhered or not can be detected only under the condition that the main and positive relays K1 are closed, the requirement on the closing/opening sequence of the relays is strict, the judgment logic is complex, and the misjudgment rate is high.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a relay adhesion detecting system has made the improvement based on above-mentioned second kind detecting system, has simplified high-voltage circuit, makes two detection circuitry relatively independent, the abnormal diagnosis when can realizing the arbitrary order closure/disconnection of main positive relay and main negative relay, and the logic is simple, clear, difficult erroneous judgement, and the sampling point of second detection circuitry both can connect the AD module can also connect the IO module, has improved this detecting system's flexibility and commonality.
The utility model discloses a following technical scheme realizes, a relay adhesion detecting system for whether the relay adhesion among the detection bilateral control circuit, including connect in the first detection circuitry between load and the main positive relay and connect in second detection circuitry between load and the main negative relay, second detection circuitry, including current-limiting unit, the one-way unit that switches on, the first end of current-limiting unit divides two the tunnel, connect all the way in between the load with between the main negative relay, another way connect in the one-way end that ends that switches on the unit, the one-way termination detection power that switches on of unit, the second end of current-limiting unit constitutes the second sampling point.
Through the improvement of the second detection circuit, the high-voltage circuit is simplified, meanwhile, the first detection circuit and the second detection circuit are relatively independent, the abnormity diagnosis of the main positive relay and the main negative relay during the closing/opening in any sequence can be realized, the logic is simple, and the misjudgment rate is low.
The utility model discloses relay adhesion detecting system's further improvement lies in, the one-way unit that switches on includes first diode, the positive pole of first diode does the conduction end, the negative pole of first diode does the end is cut off. The one-way conduction unit can be conducted only along the direction from the conduction end to the cut-off end only by one diode, and the one-way conduction unit is simple in structure and low in cost.
The utility model discloses relay adhesion detecting system's further improvement lies in, the current-limiting unit includes the fourth resistance, the first end of fourth resistance is connected the one-way unit that switches on, the second end of fourth resistance constitutes the second sampling point.
The utility model discloses relay adhesion detecting system's further improvement lies in, second AD module or IO module are connected to the second sampling point.
Through connecting different modules for whether main negative relay adhesion has been judged both to the form of judging analog voltage to second detection circuitry, also can judge whether main negative relay adhesion has been improved through the form of judging high-low level signal to whole detecting system's flexibility and commonality.
The utility model discloses relay adhesion detecting system's further improvement lies in, first detection circuitry, including second resistance, third resistance, the first end of second resistance connect in the load with between the main positive relay, the second end of second resistance concatenates ground connection behind the third resistance, the second resistance with the partial pressure node of third resistance constitutes first sampling point.
The utility model discloses relay adhesion detecting system's further improvement lies in, first AD module is connected to first sampling point.
The utility model discloses owing to adopted above technical scheme, make it have following beneficial effect:
1. through the improvement of the second detection circuit, the high-voltage circuit is simplified, meanwhile, the first detection circuit and the second detection circuit are relatively independent, the abnormity diagnosis of the main positive relay and the main negative relay during the closing/opening in any sequence can be realized, the logic is simple, and the misjudgment rate is low;
2. the second detection circuit increases the judgment mode of the IO state, and improves the flexibility and the universality of the detection system;
3. the utility model discloses detecting system can realize through less conventional component, and the circuit is simple, low cost.
Drawings
FIG. 1 is a circuit diagram of a main positive relay controlling a load in the prior art;
FIG. 2 is a circuit diagram of a prior art main negative relay controlling a load;
FIG. 3 is a diagram of a prior art dual-side control circuit;
FIG. 4 is a circuit diagram of a first relay adhesion detection system of the prior art;
FIG. 5 is a circuit diagram of a second relay adhesion detection system of the prior art;
fig. 6 is a circuit diagram of a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In a preferred embodiment, referring to fig. 6, a relay sticking detection system for detecting whether a relay in a dual-side control circuit is stuck includes a first detection circuit S1 connected between a load R1 and a main positive relay K1, and a second detection circuit S2 connected between the load R1 and a main negative relay K2, where the second detection circuit S2 includes a current limiting unit S21 and a unidirectional turn-on unit S22, a first end of the current limiting unit S21 is divided into two paths, one path is connected between the load R1 and the main negative relay K2, the other path is connected to a cut-off end of the unidirectional turn-on unit S22, a turn-on end of the unidirectional turn-on unit S22 is connected to the detection power supply VDD, and a second end of the current limiting unit S21 forms a second sampling point 2.
Specifically, the bilateral control circuit further comprises a driving power supply V1 and a main power supply V2, a first end of the load R1 is connected to a positive electrode of the second voltage V2 through the main positive relay K1, a second end of the load R1 is connected to a negative electrode of the main power supply V2 through the main negative relay K2, a negative electrode of the main power supply V2 is grounded, and the driving power supply V1 is connected to the main positive relay K1 and the main negative relay K2 at the same time to supply power to the two; the current limiting unit S21 has current limiting characteristics, so that when the main negative relay K2 is in a closed state, the current limiting unit S21 is not conducted, and when the main negative relay K2 is in an open state, the current limiting unit S21 is conducted; the one-way turn-on unit S22 has an anti-reverse characteristic such that it is turned on only from the turn-on terminal to the turn-off terminal.
Through the improvement of the second detection circuit S2, the high-voltage circuit is simplified, meanwhile, the first detection circuit S1 and the second detection circuit S2 are relatively independent, the abnormity diagnosis of the main positive relay K1 and the main negative relay K2 can be realized when the main positive relay K1 and the main negative relay K2 are switched on/off in any sequence, the logic is simple, the misjudgment rate is low, fewer conventional elements are adopted, and the circuit is simple and low in cost.
Furthermore, the unidirectional conducting unit S22 realizes the anti-reverse characteristic through the unidirectional conducting switch, in this embodiment, the first diode D1 with a simple structure and low cost is selected as the unidirectional conducting switch, the positive electrode of the first diode D1 is the conducting end of the unidirectional conducting switch, and the negative electrode is the blocking end of the unidirectional conducting switch, and of course, a person skilled in the art may select other components with anti-reverse characteristic, such as a unidirectional conducting triode or an MOS transistor, as the unidirectional conducting switch according to the actual circuit situation, which is not listed here.
Furthermore, the current limiting unit S21 realizes its current limiting characteristic through a current limiting element, in this embodiment, a fourth resistor R4 with a simple structure and low cost is selected as the current limiting element, a first end of the fourth resistor R4 is connected to the unidirectional conducting unit S22, and a second end of the fourth resistor R4 forms the second sampling point 2.
Further, due to the setting of the detection power supply VDD, the second sampling point 2 can be connected to both the second AD module AD2 and the IO module.
When connecting second AD module AD2, can judge whether main negative relay K2 adheres through the form of judging the voltage analog quantity, when connecting the IO module, whether main negative relay K2 adheres is judged to the form of judging high-low level signal to the accessible, has improved whole detecting system's flexibility and commonality.
Further, the first detection circuit S1 includes a second resistor R2 and a third resistor R3, a first end of the second resistor R2 is connected between the load R1 and the main positive relay K1, a second end of the second resistor R2 is connected in series with the third resistor R3 and then grounded, and a voltage division node between the second resistor R2 and the third resistor R3 forms a first sampling point 1.
Further, the first sampling point 1 is connected to a first AD module AD 1.
Through the improvement of the second detection circuit S2, the second detection circuit S2 and the first detection circuit S1 are relatively independent, the traditional first detection circuit S1 form can be kept, extra cost is not needed, and whether the main positive relay K1 is adhered or not is detected by continuously adopting the form of serially connecting voltage dividing resistors and collecting and judging voltage analog quantity.
In controlling the switching in and switching out of the load R1, the main positive relay K1 and the main negative relay K2 normally operate in a logical sequence one after the other: the normal logic sequence of closing is that the main negative relay K2 is closed first and then the main positive relay K1 is closed, and the main power supply V2 and the load R1 form a loop and are conducted; the normal logic sequence of disconnection is to disconnect the main positive relay K1 and then disconnect the main negative relay K2, so as to ensure that the circuit is safely disconnected without charge entering.
The following describes the judgment logic of the present embodiment in detail according to the above logic sequence of normal closing and opening, and the judgment logic is described in detail
The body is as follows:
1. when the load R1 is switched on:
the main negative relay K2 is closed, and a second detection circuit S2 composed of a one-way conduction unit S22 and a current limiting unit S21 is utilized to detect whether the main negative relay K2 is normally closed or not. If the main negative relay K2 is normally closed, the detection power supply VDD is grounded to the negative electrode of the main power supply V2 through the unidirectional conducting unit S22, the level detected by the IO module is low level or the voltage detected by the second AD module AD2 is about 0V; if the main negative relay K2 is abnormally closed (i.e. not closed), the detection power supply VDD passes through the unidirectional conducting unit S22 and the current limiting unit S21 and then reaches the IO module or the second AD module AD2, and the IO module detects that the voltage is high or the voltage detected by the second AD module AD2 is about the voltage drop of the detection power supply VDD minus the unidirectional conducting unit S22;
the main positive relay K1 is closed, and a first detection circuit S1 consisting of a second resistor R2 and a third resistor R3 is utilized to detect whether the main positive relay K1 is normally closed. If the main positive relay K1 is normally closed, the main power supply V2 is grounded through the main positive relay K1, the second resistor R2 and the third resistor R3, and the first AD module AD1 detects that the voltage is about the voltage of the main power supply V2 divided by the second resistor R2 and the third resistor R3 in proportion; if the main positive relay K1 is abnormally closed (i.e., not closed), the main power supply V2 cannot supply power to the first detection circuit S1, and the first AD module AD1 detects that the voltage is about 0V.
2. When load R1 is disconnected:
the main positive relay K1 is turned off, and whether the main positive relay K1 is normally turned off (i.e., stuck) is detected by a first detection circuit S1 composed of a second resistor R2 and a third resistor R3. If the main positive relay K1 is normally disconnected, the V2 cannot supply power to the first detection circuit S1, and the first AD module AD1 detects that the voltage is about 0V; if the main positive relay K1 is disconnected abnormally (i.e. stuck), the main power supply V2 is grounded after passing through the main positive relay K1, the second resistor R2 and the third resistor R3, and the first AD module AD1 detects that the voltage is about the voltage of the main power supply V2 according to the proportion of the second resistor R2 and the third resistor R3;
when the main positive relay K1 is normally turned off, the main negative relay K2 is turned off, and the second detection circuit S2 composed of the unidirectional turn-on unit S22 and the current limiting unit S21 is used to detect whether the main negative relay K2 is normally turned off (i.e., stuck). If the main negative relay K2 is normally turned off, the detection power supply VDD passes through the unidirectional conduction unit S22 and the current limiting unit S21 and then reaches the IO module or the second AD module AD2, and the IO module detects that the level is high or the voltage detected by the second AD module AD2 is about the voltage drop of the detection power supply VDD minus the unidirectional conduction unit S22; if the main negative relay K2 is abnormally disconnected (i.e. stuck), the detection power supply VDD is grounded from the negative electrode of the main power supply V2 through the unidirectional conducting unit S22, the level detected by the IO module is low or the voltage detected by the second AD module AD2 is about 0V;
when the main positive relay K1 is abnormally disconnected (i.e., stuck), the main negative relay K2 is turned off, and the second detection circuit S2 composed of the unidirectional turn-on unit S22 and the current limiting unit S21 is used to detect whether the main negative relay K2 is normally disconnected (i.e., stuck). If the main negative relay K2 is normally turned off, the detection power supply VDD passes through the unidirectional conduction unit S22 and the current limiting unit S21 and then reaches the IO module or the second AD module AD2, and the IO module detects that the level is high or the voltage detected by the second AD module AD2 is about the voltage drop of the detection power supply VDD minus the unidirectional conduction unit S22; if the main negative relay K2 is abnormally opened (i.e. stuck), the detection power supply VDD is grounded to the negative electrode of the main power supply V2 through the unidirectional conducting unit S22, and the level detected by the IO module is low or the voltage detected by the second AD module AD2 is about 0V.
As can be seen from the above determination logic, the first detection circuit S1 and the second detection circuit S2 are relatively independent, and when determining the state of the main positive relay K1, the determination result is not affected by the current state of the main negative relay K2, and when determining the state of the main negative relay K2, the determination result is also not affected by the current state of the main positive relay K1. When the main positive relay K1 is detected, no matter what state the main negative relay K2 is in at the time, as long as the main positive relay K1 is actually closed, the first AD module AD1 detects that the voltage is about the voltage value of the main power supply V2 divided by the second resistor R2 and the third resistor R3 in proportion, and the main positive relay K1 is actually open, the first AD module AD1 detects that the voltage is about 0V; when the main negative relay K2 is detected, no matter what state the main positive relay K1 is in at that time, as long as the main negative relay K2 is actually closed, the IO module detects that the level is low or the second AD module AD2 detects that the voltage is 0V, and the main negative relay K2 is actually open, the IO module detects that the level is high or the second AD module AD2 detects that the voltage is about the voltage of the detection power VDD minus the voltage drop of the one-way conduction unit S22.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person can make modifications or changes equivalent to the equivalent embodiment without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (6)
1. The utility model provides a relay adhesion detecting system for whether the relay adhesion among the detection bilateral control circuit, including connect in the first detection circuitry between load and the main positive relay and connect in the second detection circuitry between load and the main negative relay, its characterized in that: the second detection circuit comprises a current limiting unit and a one-way conduction unit, wherein the first end of the current limiting unit is divided into two paths, one path is connected between the load and the main negative relay, the other path is connected to the cut-off end of the one-way conduction unit, the conduction end of the one-way conduction unit is connected with a detection power supply, and the second end of the current limiting unit forms a second sampling point.
2. The relay sticking detection system according to claim 1, wherein the unidirectional conducting unit comprises a first diode, an anode of the first diode is the conducting terminal, and a cathode of the first diode is the cut-off terminal.
3. The relay sticking detection system according to claim 1, wherein the current limiting unit comprises a fourth resistor, a first end of the fourth resistor is connected with the unidirectional conducting unit, and a second end of the fourth resistor forms the second sampling point.
4. The relay adhesion detection system according to any one of claims 1 to 3, wherein the second sampling point is connected with a second AD module or an IO module.
5. The relay adhesion detection system according to any one of claims 1 to 3, wherein the first detection circuit comprises a second resistor and a third resistor, a first end of the second resistor is connected between the load and the main positive relay, a second end of the second resistor is connected in series with the third resistor and then grounded, and a voltage division node of the second resistor and the third resistor forms a first sampling point.
6. The relay sticking detection system according to claim 5, wherein the first sampling point is connected to a first AD module.
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| CN201921635555.8U CN210835161U (en) | 2019-09-27 | 2019-09-27 | Relay adhesion detecting system |
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| CN201921635555.8U CN210835161U (en) | 2019-09-27 | 2019-09-27 | Relay adhesion detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111880088A (en) * | 2020-07-23 | 2020-11-03 | 上海英恒电子有限公司 | Relay bilateral control and diagnosis circuit and method and battery management system |
| CN112684369A (en) * | 2020-11-25 | 2021-04-20 | 华帝股份有限公司 | Wind pressure switch detection system for preventing short circuit between wires of gas appliance |
| CN113454474A (en) * | 2020-10-21 | 2021-09-28 | 深圳欣锐科技股份有限公司 | System and method for detecting working state of main and negative relays |
-
2019
- 2019-09-27 CN CN201921635555.8U patent/CN210835161U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111880088A (en) * | 2020-07-23 | 2020-11-03 | 上海英恒电子有限公司 | Relay bilateral control and diagnosis circuit and method and battery management system |
| CN113454474A (en) * | 2020-10-21 | 2021-09-28 | 深圳欣锐科技股份有限公司 | System and method for detecting working state of main and negative relays |
| WO2022082525A1 (en) * | 2020-10-21 | 2022-04-28 | 深圳欣锐科技股份有限公司 | System and method for inspecting working state of main negative relay |
| CN112684369A (en) * | 2020-11-25 | 2021-04-20 | 华帝股份有限公司 | Wind pressure switch detection system for preventing short circuit between wires of gas appliance |
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