CN215263876U - Double-circuit relay state detection circuit - Google Patents
Double-circuit relay state detection circuit Download PDFInfo
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- CN215263876U CN215263876U CN202022805231.3U CN202022805231U CN215263876U CN 215263876 U CN215263876 U CN 215263876U CN 202022805231 U CN202022805231 U CN 202022805231U CN 215263876 U CN215263876 U CN 215263876U
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Abstract
The utility model relates to a double-circuit relay state detection circuit, which comprises a first detection branch and a second detection branch which are connected in parallel; the first detection branch comprises a first switch for controlling the state of the first relay, and a first sub detection branch which is connected with the first switch and detects the state of the first relay through signal change of an output port; the second detection branch comprises a second switch for controlling the state of the second relay, and a second sub-detection branch which is connected with the second switch and detects the state of the second relay through signal change of an output port; the detection circuit further comprises a control component which is arranged at the front ends of the first sub-detection branch and the second sub-detection branch so that the conduction of the two sub-detection branches is mutually independent and the whole detection circuit is not conducted when the two switches are both switched off. The detection circuit improves the detection accuracy.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a double-circuit relay state detection circuit.
Background
The relay is very extensive in the electronic technology field, for example, the ammeter field uses very extensively, along with the operating environment such as industrial development and ammeter is more and more complicated, people put forward higher requirement to devices such as ammeter, one of them is that the device can be detected to relay state promptly, but current detection circuitry is only applicable to single-way relay, can't be applicable to double-circuit relay, even there is the producer to carry out the development design of double-circuit relay detection circuitry, but in the condition that two routes were driven simultaneously, detected and carried, the unable phenomenon that reflects the relay actual state of circuit often appears, cause the interference to the control end of devices such as ammeter, make product reliability descend, the effect is unsatisfactory.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, an object of the utility model is to provide a double-circuit relay state detection circuitry, this detection circuitry can realize that double-circuit relay's state independently detects, ensures to detect the accuracy.
In order to realize the purpose, the technical scheme of the utility model is that: a double-circuit relay state detection circuit comprises a first detection branch and a second detection branch which are connected in parallel;
the first detection branch comprises a first switch for controlling the state of the first relay, and a first sub detection branch which is connected with the first switch and detects the state of the first relay through signal change of an output port;
the second detection branch comprises a second switch for controlling the state of the second relay, and a second sub-detection branch which is connected with the second switch and detects the state of the second relay through the signal change of the output port, and is characterized in that:
the detection circuit further comprises a control component which is arranged at the front ends of the first sub-detection branch and the second sub-detection branch so that the conduction of the two sub-detection branches is mutually independent and the whole detection circuit is not conducted when the two switches are both switched off.
Further, the control component comprises a first control component arranged between the first switch and the first sub detection branch to block signal change of an output port of the first sub detection branch when the first switch is switched off, and a second control component arranged between the second switch and the second sub detection branch to block signal change of an output port of the second sub detection branch when the second switch is switched off.
Furthermore, the first control component and the second component are both components which are correspondingly conducted or not conducted along with the positive and negative periodic variation of the alternating current.
Further, the first control component and the second control component are both rectifier diodes.
Further, the first control component is a first rectifying diode with the direction opposite to the positive half cycle of the alternating current voltage.
Further, the second control component is a second rectifying diode with the direction opposite to the direction of the negative half cycle of the alternating current voltage.
Further, the first sub-detection branch comprises a first conducting device which is connected with the first switch and is conducted when the alternating current is in a negative half period and provides an output port, and a first freewheeling device which is reversely connected in parallel with two ends of the first conducting device.
Further, the second sub-detection branch comprises a second conducting device which is connected with the second switch, is conducted when the alternating current is in a positive half period and provides an output port, and a second freewheeling device which is reversely connected in parallel with two ends of the second conducting device.
Further, the first conducting device and the second conducting device are optocoupler diodes.
Further, the first freewheeling component and the second freewheeling component are rectifier diodes.
Compared with the prior art, the utility model has the advantages of: the two parallel detection branch circuits are arranged in the circuit, one detection branch circuit is arranged on the cut-off diode which is conducted when the alternating current voltage is in a positive half period, and the other detection branch circuit is arranged on the cut-off diode which is conducted when the alternating current voltage is in a negative half period, so that the independent detection function of the detection branch circuits can be effectively realized, and the detection accuracy is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a two-way relay state detection circuit according to the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Fig. 1 shows a preferred embodiment of the two-way relay state detection circuit of the present invention, which comprises two parallel first and second detection branches 2, the first sensing branch comprises a first switch relay1 controlling the state of the first relay, a first sub sensing branch 11 connected to the first switch relay1 and sensing the state of the first relay through a signal change of an output port check _ relay1, the second sensing branch 2 includes a second switch delay 2 controlling the state of the second relay, a second sub sensing branch 21 connected to the second switch delay 2 and sensing the state of the second relay through a change of a signal of the output port check _ delay 2, the detection circuit further comprises a control component 3 which is arranged at the front end of the first sub-detection branch 11 and the front end of the second sub-detection branch 21 so as to enable the conduction of the two sub-detection branches to be independent and enable the whole detection circuit not to be conducted when the two switches are both switched off.
As shown in fig. 1, the control unit 3 includes a first control unit 31 disposed between the first switch relay1 and the first sub detection branch 11 to block the change of the check _ relay1 signal at the output port of the first sub detection branch 11 when the first switch relay1 is pulled, and a second control unit 32 disposed between the second switch relay2 and the second sub detection branch 21 to block the change of the check _ relay2 signal at the output port of the second sub detection branch 21 when the second switch relay2 is pulled.
The first control unit 31 and the second control unit 32 are both components that are conductive or non-conductive correspondingly to the variation of the positive and negative cycles of the alternating current, specifically, in the embodiment, the first control unit 31 is a first rectifying diode VD3 with a direction opposite to the positive half cycle of the alternating current voltage, and the second control unit 32 is a second rectifying diode VD4 with a direction opposite to the negative half cycle of the alternating current voltage, but it should be noted that the control unit may also be other switching devices, such as MOS transistors.
The first sub-detection branch 11 comprises a first conducting device 111 connected to the first switch relay1 and conducting when the ac power is in the negative half-cycle and providing an output port check _ relay1, and a first freewheeling device 112 connected in anti-parallel across the conducting device 111. The second sub-detection branch 21 comprises a second conducting device 211 connected to the second switch check _ delay 2 and conducting when the ac power is in the positive half cycle and providing an output port check _ delay 2, and a second freewheeling device 212 connected in anti-parallel across the conducting device 211. In this application, the first conducting device 111 and the second conducting device 211 are corresponding to the optocoupler diodes E1 and E2, respectively, and the first freewheeling component 112 and the second freewheeling component 212 are corresponding to the rectifier diodes VD1 and VD 2.
When the first switch relay _1 and the second switch relay _2 are both in a switching-off state, due to the existence of VD3 and VD4, whether in an alternating current positive half cycle or an alternating current negative half cycle device, the two-way relay state detection circuit is not conducted with a load (shown as R in the figure) connected at the rear ends of the two relays, and the output ports check _ relay1 and check _ relay2 have no signal change, and at the moment, the relays can be reversely pushed to be in the switching-off state through the signal change of the output ports;
when the first switch relay _1 is switched on and the second switch relay _2 is switched off, the second detection branch 2 is not conducted no matter how the alternating current changes, the output port check _ relay2 has no signal jump, the first detection branch 1 is not conducted when the alternating current is in a positive half period and is conducted when the alternating current is in a negative half period, so that the output port check _ relay1 has a signal jump, and the first switch relay1 can be reversely pushed out to be in a switched-on state according to the signal changes of the check _ relay1 and the check _ relay2, namely the first relay is in a switched-on state, and the second switch relay2 is in a switched-off state, namely the second relay is in a switched-off state;
when the first switch relay1 is switched off and the second switch relay2 is switched on, similar to the above situation, the second relay can be reversely pushed to be in the switching-on working state and the first relay is in the switching-off state; when the first switch relay1 and the second switch relay2 are both in a closed state, the output port check _ relay2 signal is changed from a low level when the alternating current is in a positive half period to a high level when the alternating current is in a negative half period, the check _ relay1 signal is changed from a high level when the alternating current is in a positive half period to a low level when the alternating current is in a negative half period, and signal jump also occurs, so that the first relay and the second relay are both in a closed state according to the signal jump information of the check _ relay1 and the check _ relay2, and the two detection branches are independent from each other and do not influence each other, and the detection accuracy is improved.
While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A double-circuit relay state detection circuit comprises a first detection branch (1) and a second detection branch (2) which are connected in parallel;
the first detection branch (1) comprises a first switch (relay1) for controlling the state of the first relay, and a first sub detection branch (11) which is connected with the first switch (relay1) and detects the state of the first relay through the signal change of an output port (check _ relay 1);
the second detection branch (2) comprises a second switch (relay2) for controlling the state of the second relay, and a second sub detection branch (21) which is connected with the second switch (relay2) and detects the state of the second relay through the signal change of an output port (check _ relay2), and is characterized in that:
the detection circuit further comprises a control component (3) which is arranged at the front ends of the first sub-detection branch (11) and the second sub-detection branch (21) so that the conduction of the two sub-detection branches is independent and the whole detection circuit is not conducted when the two switches are both switched off.
2. The two-way relay state detection circuit of claim 1, wherein:
the control part (3) comprises a first control part (31) arranged between the first switch (relay1) and the first sub detection branch (11) to block the signal change of the output port (check _ relay1) of the first sub detection branch (11) when the first switch (relay1) is switched off, and a second control part (32) arranged between the second switch (relay2) and the second sub detection branch (21) to block the signal change of the output port (check _ relay2) of the second sub detection branch (21) when the second switch (relay2) is switched off.
3. The two-way relay state detection circuit of claim 2, wherein:
the first control component (31) and the second control component (32) are components which are correspondingly conducted or not conducted along with the positive and negative periodic variation of the alternating current.
4. The two-way relay state detection circuit of claim 2, wherein:
the first control part (31) and the second control part (32) are both rectifier diodes.
5. The two-way relay state detection circuit of claim 2, wherein:
the first control means (31) is a first rectifying diode (VD3) having a direction opposite to the positive half cycle of the alternating voltage.
6. The two-way relay state detection circuit of claim 2, wherein:
the second control means (32) is a second rectifying diode (VD4) having a direction opposite to the negative half cycle of the alternating voltage.
7. The two-way relay state detection circuit of claim 2, wherein:
the first sub-detection branch (11) comprises a first conducting device (111) connected to the first switch (relay1) and conducting when the alternating current is in the negative half-cycle and providing an output port (check _ relay1), and a first freewheeling device (112) connected in anti-parallel across the first conducting device (111).
8. The two-way relay state detection circuit of claim 7, wherein:
the second sub-detection branch (21) comprises a second conducting device (211) connected to the second switch (relay2) and conducting when the alternating current is in the positive half cycle and providing an output port (check _ relay2), and a second freewheeling device (212) connected in anti-parallel across the second conducting device (211).
9. The two-way relay state detection circuit of claim 8, wherein:
the first conducting device (111) and the second conducting device (211) are both optocoupler diodes.
10. The two-way relay state detection circuit of claim 9, wherein:
the first follow current component (112) and the second follow current component (212) are both rectifier diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022805231.3U CN215263876U (en) | 2020-11-26 | 2020-11-26 | Double-circuit relay state detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022805231.3U CN215263876U (en) | 2020-11-26 | 2020-11-26 | Double-circuit relay state detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215263876U true CN215263876U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022805231.3U Active CN215263876U (en) | 2020-11-26 | 2020-11-26 | Double-circuit relay state detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215263876U (en) |
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- 2020-11-26 CN CN202022805231.3U patent/CN215263876U/en active Active
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