CN218647842U - Dry reed relay with state monitoring function - Google Patents
Dry reed relay with state monitoring function Download PDFInfo
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- CN218647842U CN218647842U CN202223016905.7U CN202223016905U CN218647842U CN 218647842 U CN218647842 U CN 218647842U CN 202223016905 U CN202223016905 U CN 202223016905U CN 218647842 U CN218647842 U CN 218647842U
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Abstract
The utility model relates to a relay technical field provides reed relay with state monitoring function, including coil state detection circuitry, contact state detection circuitry, conduction time judgement circuit and main control chip, the input of conduction time judgement circuit is all connected to coil state detection circuitry, contact state detection circuitry's output, and conduction time judgement circuit exports the fault signal to main control chip. Through above-mentioned technical scheme, realize reed relay's intellectuality, can in time discover reed relay's the trouble that switches on to avoid further influence circuit system and power equipment's safe operation.
Description
Technical Field
The utility model relates to an electromagnetic relay technical field, it is specific, relate to the reed relay with state monitoring function.
Background
With continuous innovation of the technology, the relays and the contactors are used more and more frequently, and more convenience is brought to people. In conventional electrical components such as relays and contactors, a coil and a contact are often used to control the on/off of a main circuit. However, the contacts are subjected to large current impact for a long time, the surfaces of the contacts are easily oxidized and form pits, and the losses are continuously accumulated, so that the relays and the contactors are subjected to fault operation. If the relay has a conduction fault, the closing time of a contact is too long, and an accurate on-off signal cannot be provided for a circuit system, so that serious potential safety hazards are brought to electrical equipment.
Disclosure of Invention
The utility model provides a dry reed relay with state monitoring function has solved among the prior art because the relay uses for a long time to produce the ageing wait trouble of wearing and tearing, influence the problem of relay normal use.
The technical scheme of the utility model as follows:
the dry reed relay with the state monitoring function comprises a dry reed relay and a dry reed relay,
the coil state detection circuit is used for detecting the on-off state of the input end of the reed relay and outputting a first state signal;
the contact state detection circuit is used for detecting the on-off state of the output end of the dry reed relay and outputting a second state signal;
the conduction time judging circuit is used for receiving the first state signal and the second state signal and outputting a fault signal, and the fault signal is used for representing the conduction fault state of the reed relay;
and the main control chip is used for receiving the fault signal.
As a further technical solution, when the input end of the reed relay is turned on, the first state signal is a high level signal, and when the input end of the reed relay is turned off, the first state signal is a low level signal.
As a further technical solution, when the output end of the reed relay is turned on, the second state signal is a low level signal, and when the output end of the reed relay is turned off, the second state signal is a high level signal.
As a further technical solution, a time when the first state signal changes from a low level to a high level signal is a first time, a time when the second state signal changes from a high level to a low level signal is a second time, when a time interval from the first time to the second time is greater than a preset threshold, the fault signal is a high level, and when the time interval from the first time to the second time is less than the preset threshold, the fault signal is a low level.
As a further technical solution, the coil state detection circuit includes resistors R10, R11, R12, R21, R22, a subtractor U5, and a comparator U3, a first end of the resistor R10 is connected to a first input end of the reed relay, a first end of the resistor R11 is connected to a second input end of the reed relay, a second end of the resistor R10 is connected to a non-inverting input end of the subtractor U5, a second end of the resistor R10 is connected to an output end of the subtractor U5 through the resistor R21, a second end of the resistor R11 is connected to an inverting input end of the subtractor U5, a second end of the resistor R11 is grounded through the resistor R22, an output end of the subtractor U5 is connected to a non-inverting input end of the comparator U3 through a resistor R23, an inverting input end of the comparator U3 is grounded through the resistor R12, and an output end of the comparator U3 outputs the first state signal.
As a further technical scheme, the contact state detection circuit includes rectifier U1, resistance R1, R2, R8, diode D1, triode Q1 and opto-coupler U2, resistance R8's first end is connected the first output or the second output of reed relay, resistance R8's second end ground connection, resistance R8's first end is connected rectifier U1's first input, rectifier U1's second input is connected resistance R8's second end, diode D1's positive pole is connected to rectifier U1's first output, diode D1's negative pole is established ties in proper order ground connection behind resistance R1, R2, the connection of resistance R1, R2 is connected through resistance R3 triode Q1's base, triode Q1's collecting electrode connects the 5V power, triode Q1's projecting pole is connected the first input of opto-coupler U2, opto-coupler U2's second input ground connection, U2's first output passes through resistance R7 and connects the 5V power, opto-coupler U2's second output, the output of opto-coupler U2's second output signal output.
As a further technical solution, the on-time determining circuit includes triodes Q4, Q5, Q6, a capacitor C4 and a comparator U4, a base of the triode Q4 receives the first state signal through a resistor R15, a collector of the triode Q4 is connected to a 5V power supply, an emitter of the triode Q4 is connected to a collector of the triode Q6, a base of the triode Q5 receives the second state signal through a resistor R13, a collector of the triode Q5 is connected to a 5V power supply, an emitter of the triode Q5 is grounded through a resistor R14, an emitter of the triode Q5 is connected to a base of the triode Q6, an emitter of the triode Q6 is grounded through a resistor R18, an emitter of the triode Q6 is connected to a first end of the capacitor C4, a second end of the capacitor C4 is grounded, a first end of the capacitor C4 is connected to a non-inverting input end of the comparator U4, an inverting input end of the comparator U4 is connected to a reference voltage, and an output end of the comparator U4 outputs a fault signal.
As a further technical scheme, the system further comprises a load voltage detection circuit, a load current detection circuit and an electric energy metering chip, wherein the output ends of the load current detection circuit and the load voltage detection circuit are connected with the input end of the electric energy metering chip, and the output end of the electric energy metering chip is connected with the main control chip.
As a further technical scheme, the intelligent control system further comprises a wired control interface, the main control chip is connected with an external control circuit through the wired control interface, and the external control circuit comprises an external controller or a key control circuit.
As a further technical scheme, the intelligent control system further comprises a communication module, and the communication module is connected with the main control chip.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses a coil state detection circuitry detects dry reed relay coil's on-state, detects the on-state of dry reed relay contact through contact state detection circuitry, through the on-state that detects both ends, can obtain dry reed relay's contact on-time, judges through on-time whether circuit judgement is greater than when predetermineeing the threshold value, when on-time is greater than when predetermineeing the threshold value, then proves that dry reed relay exists the fault of switching on.
The utility model discloses coil state detection circuitry, contact state detection circuitry, on-time judgement circuit have still been integrated on original dry reed relay's basis, realize dry reed relay's intellectuality, can in time discover dry reed relay's the trouble that switches on to avoid further influencing circuit system and power equipment's safe operation.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a circuit diagram of the coil state detection circuit of the present invention;
fig. 3 is a circuit diagram of the contact state detection circuit of the present invention;
fig. 4 is a circuit diagram of the on-time determining circuit of the present invention;
in the figure: 1. the main control chip comprises a dry reed relay, 2, a coil state detection circuit, 3, a contact state detection circuit, 4, an on-time judgment circuit and 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive work, are related to the scope of protection of the present invention.
Example 1
As shown in fig. 1, the present embodiment proposes a reed relay with a state monitoring function, including a reed relay,
also comprises the following steps of (1) preparing,
the coil state detection circuit is used for detecting the on-off state of the input end of the reed relay and outputting a first state signal T1;
the contact state detection circuit is used for detecting the on-off state of the output end of the dry reed relay and outputting a second state signal T2;
the on-time judging circuit is used for receiving the first state signal T1 and the second state signal T2 and outputting a fault signal out, and the fault signal out is used for indicating the on-fault state of the reed relay;
and the main control chip is used for receiving the fault signal out.
The reed relay belongs to one of electromagnetic relays, and generally controls the conduction of a coil through a direct current signal so as to close two contacts, thereby controlling the conduction of an alternating current large voltage signal. Normally, after a coil of the reed relay is conducted, the contact is closed within 50ms, and if the contact is not closed within 50ms, the reed relay has a conduction fault.
In this embodiment, detect the on state of reed relay coil through coil state detection circuit, detect the on state of reed relay contact through contact state detection circuit, through the on state that detects both ends, can obtain the contact on-time of reed relay, when being greater than the preset threshold value, then prove that there is the on-fault in reed relay. The embodiment also integrates a coil state detection circuit, a contact state detection circuit and a conduction time judgment circuit on the basis of the original reed relay, realizes the intellectualization of the reed relay, and finds the conduction fault of the reed relay in time, thereby avoiding further influencing the safe operation of a circuit system and power equipment.
In practical use, when the input end of the reed relay is turned on, the first state signal T1 output by the coil state detection circuit is a high level signal, and when the input end of the reed relay is turned off, the first state signal T1 is a low level signal. When the output end of the reed relay is switched on, the second state signal T2 output by the contact state detection circuit is a low level signal, and when the output end of the reed relay is switched off, the second state signal T2 is a high level signal. The method comprises the steps that a first time is set when a first state signal T1 is a high-level signal, a second time is set when a second state signal T2 is a low-level signal, when the time interval from the first time to the second time is the actual contact conduction time of the reed relay, when the time interval is larger than a preset threshold value, the preset threshold value is generally set to be 50ms, the maximum fault signal out output by a conduction time judging circuit is in a high level, and when the time interval from the first time to the second time is smaller than the preset threshold value, the fault signal out is in a low level. Whether the dry reed relay has the breakover fault can be accurately known by detecting the fault signal out.
Further, in the present invention,
as shown in fig. 2, the coil state detection circuit in this embodiment includes resistors R10, R11, R12, R21, R22, a subtractor U5 and a comparator U3, a first end of the resistor R10 is connected to the first input terminal of the reed relay, a first end of the resistor R11 is connected to the second input terminal of the reed relay, a second end of the resistor R10 is connected to the non-inverting input terminal of the subtractor U5, a second end of the resistor R10 is connected to the output terminal of the subtractor U5 through the resistor R21, a second end of the resistor R11 is connected to the inverting input terminal of the subtractor U5, a second end of the resistor R11 is grounded through the resistor R22, an output terminal of the subtractor U5 is connected to the non-inverting input terminal of the comparator U3 through the resistor R23, an inverting input terminal of the comparator U3 is grounded through the resistor R12, and an output terminal of the comparator U3 outputs the first state signal.
In this embodiment, the two ends of the coil of the reed relay detect the voltages at the two ends of the coil through a subtraction circuit composed of resistors R10, R11, R21, R22 and a subtractor U5, when the coil of the reed relay is turned on, the voltage at the two ends of the coil is greater than 0, the voltage signal at the non-inverting input end of the comparator U3 is greater than that at the inverting input end, and the first state signal T1 output by the comparator U3 is a high level signal.
Further, in the present invention, it is preferable that,
as shown in fig. 3, the contact state detection circuit in this embodiment includes rectifier U1, resistor R1, R2, R8, diode D1, triode Q1 and optocoupler U2, the first output end or the second output end of reed relay is connected to the first end of resistor R8, the second end of resistor R8 is grounded, the first input end of rectifier U1 is connected to the first end of resistor R8, the second end of resistor R8 is connected to the second input end of rectifier U1, the positive pole of diode D1 is connected to the first output end of rectifier U1, the negative pole of diode D1 is connected in series in proper order to resistor R1, R2 is grounded, resistor R1, R2 is connected to the base of triode Q1 through resistor R3, the collector of triode Q1 is connected to the 5V power supply, the emitter of triode Q1 is connected to the first input end of optocoupler U2, the second input end of optocoupler U2 is grounded, the first output end of optocoupler U2 is connected to the 5V power supply through resistor R7, the second output end of U2 is grounded, the first output second optocoupler state signal.
In this embodiment, when the reed relay contact breaks, the voltage division signal of resistance R1, R2 can not make triode Q1 switch on, and opto-coupler U2 also does not switch on to second state signal T2 of the first output of opto-coupler U2 is the high level signal. When the dry reed relay contact is conducted, the loop current controlled by the contact is subjected to full-wave rectification through the rectifier U1, then is output through the diode D1, is subjected to voltage division through the resistors R1 and R2, and the divided voltage signal enables the triode Q1 to be conducted, so that the optocoupler U2 is further driven to be conducted, and therefore the second state signal T2 output by the first output end of the optocoupler U2 is a low-level signal.
Further, in the present invention, it is preferable that,
as shown in fig. 4, the on-time determining circuit in this embodiment includes transistors Q4, Q5, Q6, a capacitor C4 and a comparator U4, a base of the transistor Q4 receives the first state signal T1 through a resistor R15, a collector of the transistor Q4 is connected to a 5V power supply, an emitter of the transistor Q4 is connected to a collector of the transistor Q6, a base of the transistor Q5 receives the second state signal T2 through a resistor R13, a collector of the transistor Q5 is connected to the 5V power supply, an emitter of the transistor Q5 is grounded through a resistor R14, an emitter of the transistor Q5 is connected to a base of the transistor Q6, an emitter of the transistor Q6 is grounded through a resistor R18, an emitter of the transistor Q6 is connected to a first end of the capacitor C4, a second end of the capacitor C4 is grounded, a first end of the capacitor C4 is connected to a non-inverting input end of the comparator U4, an inverting input end of the comparator U4 is connected to a reference voltage, and an output end of the comparator U4 outputs a fault signal out. The reference voltage in this embodiment is obtained by dividing the voltage by resistors R19 and R20.
In this embodiment, when the coil of the reed relay is turned on and the contact is not yet closed, the first state signal T1 is a high level signal, and the second state signal T2 is a high level signal, at which time the transistor Q4 is turned on and the transistor Q5 is turned on, to further drive the transistor Q6 to be turned on, and start charging the capacitor C4, and when the contact of the reed relay is closed, the second state signal T2 becomes a low level signal, at which time the transistor Q5 is turned off, the transistor Q6 is also turned off, and the capacitor C4 starts discharging.
Therefore, in the present embodiment, if the closing time of the reed relay contact is within the preset threshold time, the voltage charged in the capacitor C4 in the whole closing time is less than the reference voltage, the voltage signal of the non-inverting input terminal of the comparator U4 is less than the voltage signal of the inverting input terminal, and the fault signal out output by the comparator U4 is a low level signal. If the closing time of the contact of the reed relay is longer than the preset threshold time, the voltage charged by the capacitor C4 in the whole closing time is larger than the reference voltage, the voltage signal of the non-inverting input end of the comparator U4 is larger than the voltage signal of the inverting input end, and the fault signal out output by the comparator U4 is a high-level signal.
In this embodiment, the contact closing time of the reed relay is converted into a voltage signal after the capacitor C4 is charged, the reference voltage is a voltage signal corresponding to the charging of the capacitor C4 within a preset threshold time, and the two signals are compared to obtain whether the reed relay has a conduction fault.
Further, in the present invention,
the power supply device is characterized by further comprising a load voltage detection circuit, a load current detection circuit and an electric energy metering chip, wherein the output ends of the load current detection circuit and the load voltage detection circuit are connected with the electric energy metering chip, and the output end of the electric energy metering chip is connected with the main control chip.
Specifically, in a three-phase three-wire system circuit, the voltage and the current of the A phase and the C phase are detected by taking the B phase as a reference, and are respectively connected to an electric energy metering chip; in the three-phase four-wire system circuit, the voltage and the current of three phases A, B and C are detected by taking an N wire as a reference and are respectively connected to an electric energy metering chip.
In this embodiment, the input ends of the load current detection circuit and the load voltage detection circuit are both connected to the output end of the reed relay, and the main return current, i.e., the load current, can be obtained through the load current detection circuit; load voltage is detected through the load voltage detection circuit, output signals of the load current detection circuit and the load voltage detection circuit are connected into the electric energy metering chip, and the electric energy metering chip outputs load power to the main control chip, so that real-time monitoring of the main control chip on load active power, reactive power, power factors, voltage and current is realized.
Further, in the present invention,
the embodiment also comprises a wired control interface, the main control chip is connected with an external control circuit through the wired control interface, and the external control circuit comprises an external controller or a key control circuit.
The dry reed relay of this embodiment has wired control interface, and external control instruction can insert the circuit through this wired control interface, and main control chip controls dry reed relay's work according to external control instruction. The external control command can come from an external controller (for example, a PLC controller), or a key control circuit is provided, and the function of inputting different control commands is realized by controlling the on or off of the keys.
Further, in the present invention,
the embodiment further comprises a communication module, and the communication module is connected with the main control chip.
Data such as main loop current, main loop voltage, load power, the closing time of contact, reed relay's breakover fault can be sent to remote server by communication module, and the staff can know the behavior of relay in real time through remote server. Meanwhile, the staff can also send a wireless control instruction to the main control chip through the remote server to realize the remote control of the relay. Wherein, the communication module can adopt wired or wireless communication circuits commonly used in the field, such as RS485 communication, WIFI communication circuit and the like, which are not described herein.
It should be noted that the wired control interface has a higher priority, and when the signal of the wired control interface is valid, the wired control interface does not respond to the wireless control command.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The dry reed relay with the state monitoring function comprises a dry reed relay and is characterized by also comprising a dry reed relay,
the coil state detection circuit is used for detecting the on-off state of the input end of the reed relay and outputting a first state signal;
the contact state detection circuit is used for detecting the on-off state of the output end of the reed relay and outputting a second state signal;
the conduction time judging circuit is used for receiving the first state signal and the second state signal and outputting a fault signal, and the fault signal is used for indicating the conduction fault state of the reed relay;
and the main control chip is used for receiving the fault signal.
2. The reed relay with status monitoring function as claimed in claim 1, wherein the first status signal is a high level signal when the reed relay input terminal is turned on, and the first status signal is a low level signal when the reed relay input terminal is turned off.
3. The reed relay with status monitoring function as claimed in claim 2, wherein the second status signal is a low level signal when the reed relay output terminal is turned on, and the second status signal is a high level signal when the reed relay output terminal is turned off.
4. The reed relay with status monitoring function as claimed in claim 3, wherein the time when the first status signal changes from low level to high level is a first time, the time when the second status signal changes from high level to low level is a second time, the fault signal is high level when a time interval from the first time to the second time is greater than a preset threshold, and the fault signal is low level when the time interval from the first time to the second time is less than the preset threshold.
5. The reed relay with status monitoring function according to claim 2, wherein the coil status detecting circuit comprises resistors R10, R11, R12, R21, R22, a subtractor U5 and a comparator U3, a first end of the resistor R10 is connected to the first input terminal of the reed relay, a first end of the resistor R11 is connected to the second input terminal of the reed relay, a second end of the resistor R10 is connected to the non-inverting input terminal of the subtractor U5, a second end of the resistor R10 is connected to the output terminal of the subtractor U5 through the resistor R21, a second end of the resistor R11 is connected to the inverting input terminal of the subtractor U5, a second end of the resistor R11 is grounded through the resistor R22, an output terminal of the subtractor U5 is connected to the non-inverting input terminal of the comparator U3 through a resistor R23, an inverting input terminal of the comparator U3 is grounded through the resistor R12, and an output terminal of the comparator U3 outputs the first status signal.
6. The reed relay with status monitoring function according to claim 3, wherein the contact status detecting circuit comprises a rectifier U1, resistors R1, R2, R8, a diode D1, a transistor Q1 and an optocoupler U2, a first end of the resistor R8 is connected to the first output end or the second output end of the reed relay, a second end of the resistor R8 is grounded, a first end of the resistor R8 is connected to the first input end of the rectifier U1, a second input end of the rectifier U1 is connected to the second end of the resistor R8, a first output end of the rectifier U1 is connected to an anode of the diode D1, a cathode of the diode D1 is sequentially connected in series to the resistors R1 and R2 and then grounded, the resistors R1 and R2 are connected to a base of the transistor Q1 through a resistor R3, a collector of the transistor Q1 is connected to a 5V power supply, an emitter of the transistor Q1 is connected to the first input end of the diode U2, a second input end of the optocoupler U2 is grounded, a first output end of the optocoupler U2 is connected to a second output signal of the optocoupler U2 through a resistor R7, and a second output end of the optocoupler U2 is connected to the second output signal.
7. The reed relay with status monitor function according to claim 4, wherein the on-time determining circuit comprises transistors Q4, Q5, Q6, a capacitor C4 and a comparator U4, wherein a base of the transistor Q4 receives the first status signal through a resistor R15, a collector of the transistor Q4 is connected to a 5V power supply, an emitter of the transistor Q4 is connected to a collector of the transistor Q6, a base of the transistor Q5 receives the second status signal through a resistor R13, a collector of the transistor Q5 is connected to a 5V power supply, an emitter of the transistor Q5 is connected to ground through a resistor R14, an emitter of the transistor Q5 is connected to a base of the transistor Q6, an emitter of the transistor Q6 is connected to ground through a resistor R18, an emitter of the transistor Q6 is connected to a first end of the capacitor C4, a second end of the capacitor C4 is connected to ground, a first end of the capacitor C4 is connected to a non-inverting input end of the comparator U4, and an output end of the comparator U4 outputs a fault reference signal.
8. The reed relay with status monitoring function as claimed in claim 1, further comprising a load voltage detection circuit, a load current detection circuit and an electric energy metering chip, wherein the output terminals of the load current detection circuit and the load voltage detection circuit are connected to the input terminal of the electric energy metering chip, and the output terminal of the electric energy metering chip is connected to the main control chip.
9. The reed relay with status monitoring function as in claim 1, further comprising a wired control interface, wherein the main control chip is connected to an external control circuit through the wired control interface, and the external control circuit comprises an external controller or a key control circuit.
10. The reed relay with status monitoring function as in claim 1, further comprising a communication module, wherein the communication module is connected with the main control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223016905.7U CN218647842U (en) | 2022-11-14 | 2022-11-14 | Dry reed relay with state monitoring function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223016905.7U CN218647842U (en) | 2022-11-14 | 2022-11-14 | Dry reed relay with state monitoring function |
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| CN218647842U true CN218647842U (en) | 2023-03-17 |
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| CN202223016905.7U Active CN218647842U (en) | 2022-11-14 | 2022-11-14 | Dry reed relay with state monitoring function |
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