CN218386944U - Load switch safety control device - Google Patents
Load switch safety control device Download PDFInfo
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- CN218386944U CN218386944U CN202222550313.7U CN202222550313U CN218386944U CN 218386944 U CN218386944 U CN 218386944U CN 202222550313 U CN202222550313 U CN 202222550313U CN 218386944 U CN218386944 U CN 218386944U
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Abstract
The utility model relates to a load switch safety control device, include: the output end of the relay module is electrically connected with the load circuit; the load circuit detection module is electrically connected with the output end of the relay module and used for acquiring the state data of the load circuit; the control state detection module is electrically connected with the control end of the relay module and is used for acquiring relay state data; the relay control module is electrically connected with the control end of the relay module and used for controlling the electric connection state of the relay and the load circuit according to the relay control instruction; and the microprocessor is respectively electrically connected with the load circuit detection module, the control state detection module and the relay control module, and is used for outputting a relay control instruction to the relay control module and receiving relay state data and load circuit state data.
Description
Technical Field
The utility model relates to a load switch safety control device belongs to relay control field.
Background
A relay is a control element commonly used in the field of electrical control. In order to meet different power load requirements, the relay can be used for remotely controlling the on and off of the electric equipment. Since the load is generally strong current, the requirements on the safety and reliability of the relay control circuit are high.
The existing relay control circuit generally controls 1 triode to be switched on or off through one output signal of a microprocessor MCU (microprogrammed control Unit), and the triode controls a coil of the relay to be switched on or off, so that the relay is controlled to be attracted and released, and the control of an electric load is realized. However, the existing relay control circuit does not detect the external actual state after the relay acts, and the problem of relay failure cannot be found in time.
Therefore, a switch control device capable of detecting an external actual state after the relay is operated is required.
Patent publication No. CN112114251A, "Relay on-off State monitoring Circuit and control method and air conditioner" discloses that a Relay on-off State monitoring circuit applied to direct current load control comprises a direct current power supply DC, a relay K and a load which are sequentially connected in series, a monitoring module is connected between the relay K and the load in series, the monitoring module monitors the relay K and feeds an on-off state signal back to a controller, and the controller judges whether the relay K is normally switched on or off and controls the on-off state of the relay K.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the above-mentioned prior art, the utility model provides a load switch safety control device utilizes load circuit detection module real-time supervision load circuit operating condition, utilizes control state detection module real-time supervision relay operating condition, can in time discover relay trouble to improve security, reliability.
The technical scheme of the utility model as follows:
a load switch safety control device comprising:
the output end of the relay module is electrically connected with the load circuit;
the load circuit detection module is electrically connected with the output end of the relay module and used for acquiring the state data of the load circuit;
the control state detection module is electrically connected with the control end of the relay module and is used for acquiring relay state data;
the relay control module is electrically connected with the control end of the relay module and used for controlling the electric connection state of the relay and the load circuit according to the relay control instruction;
and the microprocessor is respectively electrically connected with the load circuit detection module, the control state detection module and the relay control module, and is used for outputting a relay control instruction to the relay control module and receiving relay state data and load circuit state data.
Further, the system also comprises a communication module; the communication module is electrically connected with the microprocessor and used for communicating with the server.
Further, the load circuit detection module comprises a resistor R1, a resistor R2, a resistor R4 and an optical coupler U1;
the first end of the resistor R1 is electrically connected with the first output end of the relay module, and the second end of the resistor R1 is electrically connected with a pin 1 of the optical coupler U1; the first end of the resistor R2 is electrically connected with the second output end of the relay module, and the second end of the resistor R2 is electrically connected with a pin 2 of the optical coupler U1;
the first end of the resistor R4 is electrically connected with a pin 3 of the optical coupler U1, and the second end of the resistor R4 is electrically connected with the microprocessor; pin 4 of the optocoupler U1 is externally connected to a power supply.
Further, the load circuit detection module further comprises a diode D1; the anode of the diode D1 is electrically connected with the second end of the resistor R2, and the cathode of the diode D1 is electrically connected with the second end of the resistor R1.
Further, the relay control module comprises a resistor R6, a resistor R8, a triode Q1 and a triode Q2;
the first end of the resistor R6 is electrically connected with the microprocessor, and the second end of the resistor R6 is commonly connected with the base electrode of the triode Q1 and the collector electrode of the triode Q2; the collector of the triode Q1 is electrically connected with the control end of the relay module, and the emitter of the triode Q1 is grounded; the first end of the resistor R8 is electrically connected with the microprocessor, and the second end of the resistor R8 is electrically connected with the base electrode of the triode Q2; the emitter of the triode Q2 is grounded.
Further, the control state detection module comprises a resistor R5, a resistor R11, a resistor R12 and a comparator;
the positive phase input end of the comparator is electrically connected with the first end of the resistor R11, the negative phase input end of the comparator is electrically connected with the first end of the resistor R12, and the output end of the comparator is electrically connected with the first end of the resistor R5; the second end of the resistor R5 is electrically connected with the microprocessor; the second end of the resistor R11 is electrically connected with an external power supply; and the second end of the resistor R12 is electrically connected with the control end of the relay module.
Further, the control state detection module further comprises a resistor R10;
the first end of the resistor R10 is electrically connected with the first end of the resistor R11, and the second end of the resistor R10 is grounded;
further, the relay module comprises a relay RL1 and a diode D2;
the control end of the relay RL1 is electrically connected with the anode of the diode D2, the input end of the relay RL1 and the cathode of the diode D2 are connected with an external power supply, and the output end of the relay RL1 is electrically connected with the load circuit.
The utility model discloses use at AC load control, have following beneficial effect:
1. the utility model controls the relay to act through two paths of signals (the two paths of signals satisfy the designated state, the relay acts), improves the anti-interference and prevents the misoperation;
2. the utility model discloses a two kinds of modes detect relay state: 1. detecting whether the relay control signal is normal by using a control state detection module; 2. detecting whether the control of a load circuit where the relay is located is normal or not by using a load circuit detection module; the two modes are used for simultaneous detection, and the accuracy and the reliability are higher.
Drawings
Fig. 1-4 are schematic diagrams of the utility model.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
Referring to fig. 1 to 4, a load switch control device includes:
the output end of the relay module is electrically connected with the load circuit;
the load circuit detection module is electrically connected with the output end of the relay module; the load circuit detection module detects the load wiring condition of the output end of the relay, namely load circuit state data; when the load wiring is normal, namely the output end of the relay module is closed, the load circuit is in a conducting state;
the control state detection module is electrically connected with the control end of the relay module; the control state detection module detects the level state of the relay control end and adopts a comparator to output a detection value, namely relay state data;
the relay control module is electrically connected with the control end of the relay module and used for controlling the relay to be attracted or released according to the relay control instruction;
the microprocessor is respectively electrically connected with the load circuit detection module, the control state detection module and the relay control module, and is used for outputting a relay control instruction to the relay control module, receiving relay state data and load circuit state data and judging whether the working state of the relay is normal or not according to the relay state data and the relay control instruction;
and the communication module comprises a Bluetooth module and an RS485 communication module, is electrically connected with the microprocessor and is communicated with the remote server.
Example two
The load circuit detection module comprises resistors R1, R2, R3 and R4, an optical coupler U1 and a diode D1, and the specific connection relation is as follows:
the first end of the resistor R1 is electrically connected with the first output end of the relay RL1, and the second end of the resistor R1 is electrically connected with a pin 1 of the optical coupler U1; the first end of the resistor R2 is electrically connected with the second output end of the relay RL1, and the second end of the resistor R2 is electrically connected with a pin 2 of the optical coupler U1; the anode of the diode D1 is electrically connected with the second end of the resistor R2, and the cathode of the diode D1 is electrically connected with the second end of the resistor R1. Diode D1 is used for opening reverse protection, prevents that opto-coupler overvoltage from damaging.
A first end of the resistor R4 is electrically connected with a pin 3 of the optical coupler U1, and a second end of the resistor R4 is electrically connected with the microprocessor; the first end of the resistor R3 is electrically connected with the second end of the resistor R4, and the second end of the resistor R3 is grounded; pin 4 of the optocoupler U1 is connected to a 5V supply.
Resistors R1 and R2 and an optical coupler U1 in the load circuit detection module form a detection loop, when a voltage difference exists between pins 1 and 2 of the optical coupler U1, an internal light emitting tube of the optical coupler is lightened, an internal phototriode is conducted, the output voltage of an optical coupler pin 3 is changed, and the voltage is changed and output to a microprocessor through a resistor R4.
In the embodiment, the characteristics that the input and the output of the optical coupler are mutually isolated, the electric signal transmission has unidirectionality and the like are utilized, the electric insulation capacity and the anti-interference capacity are good, the isolation of an external load circuit and an internal circuit of the device is realized, and the safe operation of the device is protected.
EXAMPLE III
The relay module includes: relay RL1, diode D2. The control end of the relay RL1 is electrically connected with the anode of the diode D2, the input end of the relay RL1 and the cathode of the diode D2 are connected with a 5V power supply, and the output end of the relay RL1 is electrically connected with a load circuit.
The relay control module includes: the resistors R6, R7, R8 and R9, the triodes Q1 and Q2 and the capacitor C1 are specifically connected as follows:
the first end of the resistor R6 is electrically connected with the microprocessor, and the second end of the resistor R6 is commonly connected with the base electrode of the triode Q1 and the collector electrode of the triode Q2; the collector of the triode Q1 is electrically connected with the control end of the relay RL1, and the emitter of the triode Q1 is grounded;
the first end of the resistor R8 is electrically connected with the microprocessor, and the second end of the resistor R8 is electrically connected with the base electrode of the triode Q2; the emitter of the triode Q2 is grounded;
the first end of the resistor R7 is electrically connected with the second end of the resistor R8, and the second end of the resistor R7 is electrically connected with a 5V power supply;
the resistor R9 and the capacitor C1 are connected in parallel to form a resistance-capacitance loop, the first end of the resistance-capacitance loop is electrically connected with the base electrode of the triode Q1, and the second end of the resistance-capacitance loop is grounded.
When the relay needs to be closed, the microprocessor outputs two paths of control signals, the first control signal connecting resistor R8 is at a low level, the triode Q2 is controlled to be disconnected, and the second control signal is enabled to control the triode Q1; the second control signal connecting resistor R6 is at a high level and controls the conduction of the triode Q1; triode Q1 connects the relay control end, and Q1 switches on control relay coil and switches on with ground, and the relay coil other end is connected 5V, and the relay coil is gone up the electricity, the relay actuation, and the output is closed, and load circuit switches on.
When the relay needs to be disconnected, the microprocessor outputs two paths of control signals, the first control signal connecting resistor R8 is at a high level and controls the triode Q2 to be closed, and the second control signal connecting resistor R6 is at a low level and controls the triode Q1 to be disconnected; the control end of the relay is disconnected with the ground, the coil is powered off, the relay is released, and the output end of the relay is disconnected.
When the first control signal is not at a low level or the second control signal is not at a high level, the output end of the relay is disconnected; or the first control signal is low and the second control signal is high, the relay output can be closed when both conditions are met.
Example four
The control state detection module comprises resistors R5, R10, R11, R12 and a comparator, and the specific connection relation is as follows:
the positive phase input end of the comparator is commonly connected with the first end of the resistor R10 and the first end of the resistor R11, the negative phase input end of the comparator is electrically connected with the first end of the resistor R12, and the output end of the comparator is electrically connected with the first end of the resistor R5; the second end of the resistor R5 is electrically connected with the microprocessor; the second end of the resistor R10 is grounded; the second end of the resistor R11 is electrically connected with a 5V power supply; and the second end of the resistor R12 is electrically connected with the control end of the relay RL 1.
The microprocessor starts the control state detection module to acquire the state data of the relay. The signal of the control end of the relay is connected to the inverting input end of the comparator through a resistor R12, and the non-inverting input end of the comparator is connected with resistors R10 and R11 for voltage division. The comparator outputs an electrical signal (i.e., relay status data) to the microprocessor through resistor R5. When the control end of the relay is at a high level, the comparator outputs a low level to indicate that the relay is disconnected; when the relay control end is at low level, the comparator outputs high level, which indicates that the relay is closed. The microprocessor analyzes the relay state data and compares the relay control instruction with the current state data. When the action command is consistent with the state data, the relay is indicated to work normally, otherwise, an alarm is prompted.
EXAMPLE five
The work flow of the load switch safety control device is as follows:
step 1, a communication module is connected with a server, receives a server control instruction and forwards the received instruction to a microprocessor;
and 2, after the microprocessor receives the control instruction, the load circuit detection module is started, the two output ends of the relay are connected with resistors R1 and R2 of the load detection module to form a detection loop with pins 1 and 2 of the optocoupler U1, and the diode D1 is started to perform reverse protection to prevent overvoltage damage of the optocoupler. When a voltage difference exists between the optocoupler pins 1 and 2, an internal light emitting tube of the optocoupler is lightened, an internal phototriode is conducted, the optocoupler pin 3 outputs a voltage change and is connected with a microprocessor through a resistor R4, and the microprocessor acquires data through AD sampling;
and step 4, the microprocessor controls the relay to act according to the instruction, and when the relay needs to be closed, the microprocessor outputs two paths of control signals: when the first control signal is at a low level and the second control signal is at a high level, the output end of the relay is closed; otherwise, the output end of the relay is disconnected;
and 5, starting the control state detection module by the microprocessor to acquire the state of the relay. The signal of the control end of the relay is connected to the inverting input end of the comparator through a resistor R12, and the non-inverting input end of the comparator is connected with resistors R10 and R11 for voltage division. When the relay control end is at a high level, the comparator outputs a low level to indicate that the relay is disconnected; when the relay control end is at a low level, the comparator outputs a high level to indicate that the relay is closed. And the microprocessor analyzes the collected relay control state information and compares the information with the relay control instruction. When the control output state is consistent with the acquisition state, indicating that the relay works normally, otherwise, prompting an alarm;
and step 6, the microprocessor finishes command control and returns the current control command, the actual control state and the abnormal alarm information to the server.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
1. A load switch safety control device, comprising:
the output end of the relay module is electrically connected with the load circuit;
the load circuit detection module is electrically connected with the output end of the relay module and used for acquiring the state data of the load circuit;
the control state detection module is electrically connected with the control end of the relay module and is used for acquiring relay state data;
the relay control module is electrically connected with the control end of the relay module and used for controlling the electric connection state of the relay and the load circuit according to the relay control instruction;
and the microprocessor is respectively electrically connected with the load circuit detection module, the control state detection module and the relay control module, and is used for outputting a relay control instruction to the relay control module and receiving relay state data and load circuit state data.
2. The load switch safety control device according to claim 1, further comprising a communication module; the communication module is electrically connected with the microprocessor and used for communicating with the server.
3. The load switch safety control device according to claim 1, wherein the load circuit detection module comprises a resistor R1, a resistor R2, a resistor R4, and an optocoupler U1;
the first end of the resistor R1 is electrically connected with the first output end of the relay module, and the second end of the resistor R1 is electrically connected with a pin 1 of the optical coupler U1; the first end of the resistor R2 is electrically connected with the second output end of the relay module, and the second end of the resistor R2 is electrically connected with a pin 2 of the optical coupler U1;
the first end of the resistor R4 is electrically connected with a pin 3 of the optical coupler U1, and the second end of the resistor R4 is electrically connected with the microprocessor; pin 4 of the optocoupler U1 is externally connected to a power supply.
4. The load switch safety control device according to claim 3, wherein the load circuit detection module further comprises a diode D1; the anode of the diode D1 is electrically connected with the second end of the resistor R2, and the cathode of the diode D1 is electrically connected with the second end of the resistor R1.
5. The load switch safety control device according to claim 1, wherein the relay control module comprises a resistor R6, a resistor R8, a transistor Q1, and a transistor Q2;
the first end of the resistor R6 is electrically connected with the microprocessor, and the second end of the resistor R6 is commonly connected with the base electrode of the triode Q1 and the collector electrode of the triode Q2; the collector of the triode Q1 is electrically connected with the control end of the relay module, and the emitter of the triode Q1 is grounded; the first end of the resistor R8 is electrically connected with the microprocessor, and the second end of the resistor R8 is electrically connected with the base electrode of the triode Q2; the emitter of the triode Q2 is grounded.
6. The load switch safety control device according to claim 1, wherein the control state detection module comprises a resistor R5, a resistor R11, a resistor R12, and a comparator;
the positive phase input end of the comparator is electrically connected with the first end of the resistor R11, the negative phase input end of the comparator is electrically connected with the first end of the resistor R12, and the output end of the comparator is electrically connected with the first end of the resistor R5; the second end of the resistor R5 is electrically connected with the microprocessor; the second end of the resistor R11 is electrically connected with an external power supply; and the second end of the resistor R12 is electrically connected with the control end of the relay module.
7. The load switch safety control device according to claim 6, wherein the control state detection module further comprises a resistor R10;
the first end of the resistor R10 is electrically connected with the first end of the resistor R11, and the second end of the resistor R10 is grounded.
8. The load switch safety control device according to claim 1, wherein the relay module comprises a relay RL1, a diode D2;
the control end of the relay RL1 is electrically connected with the anode of the diode D2, the input end of the relay RL1 and the cathode of the diode D2 are connected with an external power supply, and the output end of the relay RL1 is electrically connected with the load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222550313.7U CN218386944U (en) | 2022-09-26 | 2022-09-26 | Load switch safety control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222550313.7U CN218386944U (en) | 2022-09-26 | 2022-09-26 | Load switch safety control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218386944U true CN218386944U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222550313.7U Active CN218386944U (en) | 2022-09-26 | 2022-09-26 | Load switch safety control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218386944U (en) |
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2022
- 2022-09-26 CN CN202222550313.7U patent/CN218386944U/en active Active
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