CN216437536U - Relay switch control circuit - Google Patents
Relay switch control circuit Download PDFInfo
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- CN216437536U CN216437536U CN202122533823.9U CN202122533823U CN216437536U CN 216437536 U CN216437536 U CN 216437536U CN 202122533823 U CN202122533823 U CN 202122533823U CN 216437536 U CN216437536 U CN 216437536U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a relay switch control circuit relates to the automatic control field, including relay control circuit and power supply circuit module, power supply circuit module is the power supply of relay control circuit, and the break-make of relay control circuit control relay place circuit still includes: the sensing module is connected with the power circuit module and used for sensing whether a person exists in a preset range or not, and if yes, a sensing signal OUT0 is output; the control module is connected with the power circuit module and the induction module, receives the induction signal OUT0 and outputs a control signal OUT representing the starting; the relay control circuit is connected to the control module and responds to the control signal OUT to control the switching action of the relay. The automatic on-off switch has the effects that the switch is automatically turned on when someone exists, and the switch is automatically turned off when nobody exists.
Description
Technical Field
The application relates to the field of automatic control, in particular to a relay switch control circuit.
Background
The lighting equipment is one of indispensable equipment in daily life, need utilize lighting equipment to throw light on night, convenient action. The lighting equipment is usually lighted by manually pressing the lighting switch when entering the corridor at night, and the lighting equipment is turned off by pressing the lighting switch again when leaving the corridor.
The lighting switch can utilize relay switch to realize, when getting into the corridor night, presses lighting switch and makes relay coil circular telegram, and relay switch is closed, and lighting apparatus's circuit is by relay switch control and then make lighting apparatus throw light on.
However, when the switch is pressed at night, the lighting switch is difficult to find especially in a strange and spacious place due to the fact that no light is on initially, and therefore the action is limited.
SUMMERY OF THE UTILITY MODEL
In order to make the light automatic light when someone comes at night, automatic extinguishes when nobody, realizes automatic switch's function, this application provides a relay switch control circuit, realizes through following mode.
The utility model provides a relay switch control circuit, includes relay control circuit and power supply circuit module, and power supply circuit module is the power supply of relay control circuit, and the break-make of relay control circuit control relay place circuit still includes:
the sensing module is connected with the power circuit module and used for sensing whether a person exists in a preset range or not, and if yes, a sensing signal OUT0 is output;
the control module is connected with the power circuit module and the induction module, receives the induction signal OUT0, outputs a control signal OUT representing the opening, and outputs the control signal OUT representing the closing when the induction signal OUT0 is not received;
the relay control circuit is connected to the control module, responds to the control signal OUT representing opening to control the switch of the relay to be closed, and responds to the control signal OUT representing closing to control the switch of the relay to be opened.
Through adopting above-mentioned technical scheme, the response module is when sensing the people, output sensing signal OUT0, and reach control module with sensing signal OUT0, control module is when receiving sensing signal OUT0, control relay control circuit begins work, the coil circular telegram of relay, the switch is closed, make load work, when unmanned, the response module does not reach the people, control module control makes the outage of relay coil, the switch disconnection, load stop work or OUT of work, through the response module, control mode and relay control module's cooperation, realized when someone, the system begins work, the effect of automatic disconnection when unmanned.
Optionally, the power circuit module includes: the voltage conversion circuit comprises a 12V voltage conversion circuit, a 5V voltage conversion circuit and a 3.3V voltage conversion circuit;
the 12V voltage conversion circuit is connected to the control module, responds to a control signal OUT representing the opening, outputs 12V voltage to the relay control circuit and is connected with the 5V voltage conversion circuit;
the 5V voltage conversion circuit is connected with the induction module and is used for outputting 5V voltage to 3.3V voltage conversion circuit and the induction module;
the 3.3V voltage conversion circuit is connected with the 5V voltage conversion circuit and used for outputting 3.3V voltage and supplying power for the control module.
By adopting the technical scheme, the 12V voltage conversion circuit transmits current to the 5V voltage conversion circuit and the 3.3V voltage conversion circuit to generate 5V and 3.3V voltages to supply power to the control module and the induction module, when the switch of the relay is controlled to be closed, the control module controls the 12V voltage conversion circuit to output 12V voltage by outputting a control signal OUT for representing opening, and the 12V voltage conversion circuit is used for supplying power to the coil of the relay, so that the switch of the relay is closed, and the load starts to work.
Optionally, the power circuit module includes a voltage reduction unit, a rectification unit, and a voltage conversion circuit;
the voltage reduction unit is used for reducing the voltage of the 220V alternating current and outputting a low-voltage alternating current signal;
the rectifying unit is connected with the voltage reduction unit and is used for rectifying the low-voltage alternating current signal into low-voltage direct current;
the rectifying unit is connected with the voltage conversion circuit and transmits the low-voltage direct current to the voltage conversion circuit.
By adopting the technical scheme, the power circuit module reduces 220V alternating current into low-voltage alternating current through the voltage reduction unit, then rectifies the low-voltage alternating current into low-voltage direct current of about 24V through the rectifying circuit, and then passes the 24V low-voltage direct current through the voltage conversion circuit to generate 12V direct current to supply power for the relay, 5V direct current to supply power for the induction module, and 3.3V direct current to supply power for the control module.
Optionally, the rectifying unit includes a positive polarity output terminal and a negative polarity output terminal, and the negative polarity output terminal is grounded;
the 5V voltage conversion circuit comprises a 5V voltage regulator tube ZD1 and a fourth polarity capacitor C4, wherein the cathode of the 5V voltage regulator tube ZD1 is connected with the anode of the fourth polarity capacitor C4; the anode of the 5V voltage-regulator tube ZD2 is connected with the cathode of the fourth-polarity capacitor C4; the cathode of the 5V voltage-stabilizing tube ZD1 is connected with the positive polarity output end of the rectifying unit;
the 3.3V voltage conversion circuit comprises an LDO chip, a second polarity capacitor C2 and a third non-polarity capacitor C3, wherein the LDO chip is a three-port element, one end of the LDO chip is connected with the cathode of a 5V voltage regulator tube ZD1, one end of the LDO chip is grounded, the other end of the LDO chip is connected with the anode of a second polarity capacitor C2, the cathode of the second polarity capacitor C2 is grounded, and the third non-polarity capacitor C3 is connected with the second polarity capacitor C2 in parallel.
By adopting the technical scheme, the 5V voltage regulator tube ZD1 provides stable 5V voltage for the system when someone or nobody, for the power supply of response module and 3.3V voltage conversion circuit, utilize LDO chip (low voltage linear regulator chip), stabilize 5V voltage to 3.3V and export, be used for supplying power to control module, when someone or nobody, all continuously stably 3 output 5V and 3.3V voltage, continuously supply power for response module and control module, guarantee the normal work of two modules.
Optionally, the 12V voltage conversion circuit includes a first switching element;
the relay control circuit includes a second switching element;
the first switching element is used for outputting an off state when responding to a control signal OUT representing the opening; the second switching element is used for outputting a closed state when responding to a control signal OUT representing opening;
the first switching element is used for outputting a closed state when responding to a control signal OUT representing closing; the second switching element is used for outputting an off state when responding to a control signal OUT representing closing;
specifically, the first switching element is connected between the positive polarity output end of the rectifying unit and the cathode of the 5V voltage regulator tube ZD 1;
the relay control circuit also comprises a relay and a 12V voltage regulator tube ZD 2;
one end of a coil of the relay is connected with the positive polarity output end of the rectifying unit, the other end of the coil of the relay is connected with one end of a second switching element, the other end of the second switching element is connected with the anode of a 12V voltage-regulator tube ZD2, and the cathode of the 12V voltage-regulator tube ZD2 is connected with the positive polarity output end of the rectifying unit.
By adopting the technical scheme, when the induction module does not induce people, the control module outputs the control signal OUT representing closing, at the moment, the output of the first switch element is in a closed state, the output of the second switch element is in an open state, and at the moment, the current output by the positive polarity output end of the rectification unit flows through the closed first switch element to a subsequent circuit; when the induction module senses a person, the control module outputs a control signal OUT representing opening, the output of the first switch element is in a disconnected state, the output of the second switch element is in an opened state, at the moment, the current output by the positive polarity output end of the rectifying unit passes through a 12V voltage regulator tube ZD2, the voltage output by the positive polarity output end of the rectifying unit is about 24V, the voltage at two ends of the 12V voltage regulator tube ZD2 breaks through the 12V voltage regulator tube ZD2, the voltage at two ends of the 12V voltage regulator tube ZD2 is stabilized at 12V, the voltage at the cathode of the 12V voltage regulator tube is about 17V, and the voltage at the anode is approximately equal to 5V; the voltage at the two ends of the coil of the relay is approximately equal to the voltage at the two ends of the 12V voltage-regulator tube ZD2, the coil is electrified, the switch of the relay is closed, the load starts to work, and the dissipation power generated by electrifying the two ends of the 12V voltage-regulator tube ZD2 when no person exists is reduced.
Optionally, the first switching element includes a first transistor Q1, a first resistor R1, a second resistor R2, a first polarity capacitor C1, a sixth resistor R6, a second transistor Q2, and an eighth resistor R8;
the first triode Q1 is a PNP type triode, the second triode Q2 is an NPN type triode, the emitter of the first triode Q1 is connected with the positive polarity output end of the rectifying unit, the collector of the first triode Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the cathode of the 5V voltage regulator tube, the base of the first triode Q1 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is connected with one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected with the control module; the positive electrode of the first polarity capacitor C1 is connected with the emitter electrode of the first triode Q1, and the negative electrode of the first polarity capacitor C1 is connected with the collector electrode of the first triode Q1; an emitter of the first triode Q1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with a base of a first triode Q1;
the second switching element includes a third transistor Q3, a ninth resistor R9, a tenth resistor R10, a fourth transistor Q4, and an eleventh resistor R11;
the third triode Q3 is a PNP triode, the fourth triode Q4 is an NPN triode, an emitter of the third triode Q3 is connected to one end of a coil of the relay, which is far away from the rectifying unit, a collector of the third triode Q3 is connected to an anode of a 12V voltage regulator ZD2, a base of the third triode Q3 is connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is connected to a collector of the fourth triode Q4, an emitter of the fourth triode Q4 is grounded, a base of the fourth triode Q4 is connected to one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the control module and is used for receiving a control signal OUT; one end of the ninth resistor R9 is connected to the emitter of the third transistor Q3, and the other end is connected to the base of the third transistor Q3.
By adopting the technical scheme, when the first switching element responds to be closed and the second switching element responds to be opened, the first triode Q1 and the second triode Q2 are connected, the third triode Q3 and the fourth triode Q4 are disconnected, when the first switching element responds to be opened and the second switching element responds to be closed, the first triode Q1 and the second triode Q2 are disconnected, the third triode Q3 and the fourth triode Q4 are connected, and the connection and disconnection of the switching elements are realized through triode control.
Optionally, the relay switch control circuit further includes a zero-crossing detection circuit;
the zero crossing point detection circuit comprises a first diode D1, a fifteenth resistor R15, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a sixth triode Q6;
the anode of the first diode D1 is connected with the power circuit module, the cathode of the first diode D1 is connected with one end of a nineteenth resistor R19 through a fifteenth resistor R15, the other end of the nineteenth resistor R19 is connected with one end of a twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, and one end of the twentieth resistor R20 is connected with one end of the nineteenth resistor R19 close to the twenty-first resistor R21; the other end of the twentieth resistor R20 is connected to the base of the sixth transistor Q6, the emitter of the sixth transistor Q6 is grounded, and the collector of the sixth transistor Q6 is connected to the control module.
By adopting the technical scheme, the zero crossing point detection circuit acquires the zero crossing point of the alternating current, the control module controls the zero crossing point of the alternating current to output the control signal OUT for representing the opening, so that the coil of the relay is electrified, the switch is closed, the spark generation of the relay can be effectively reduced, and the service life is prolonged.
In summary, the present application has the following beneficial effects:
1. by adopting the structure of the power circuit module, the induction module, the control module and the relay control circuit, the functions of automatically closing the switch when people exist and automatically opening the switch when no people exist are realized.
2. Through adopting zero crossing detection circuitry, response module, controller and relay control circuit's structure, realized after sensing people, made the relay switch closure at the zero crossing point of voltage, effectively reduced the probability that produces the spark when relay switch closure, reduced the temperature rise of relay normal work, prolonged the life of relay.
Drawings
FIG. 1 is a system block diagram of a relay switch control circuit;
FIG. 2 is a connection diagram of a control module of a relay switch control circuit;
FIG. 3 is a circuit diagram of a power module of a relay switch control circuit;
fig. 4 is a circuit diagram of a zero-crossing point detection circuit of a relay switch control circuit.
Reference numerals: 1. a power circuit module; 11. a 12V voltage conversion circuit; 12. a 5V voltage conversion circuit; 13. a 3.3V voltage conversion circuit; 2. a sensing module; 3. a control module; 4. a relay control circuit.
Detailed Description
The application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a relay switch control circuit, refer to fig. 1, including power supply circuit module 1, response module 2, control module 3 and relay control circuit 4.
The power circuit module 1 provides 12V voltage to supply power for the relay control circuit 4, 5V voltage to supply power for the induction module 2 and 3.3V voltage to supply power for the control module 3; the sensing module 2 is connected with the control module 3 and used for sensing whether a person walks within a preset range or not, and if the person walks within the preset range, the sensing module outputs a sensing signal OUT0 to indicate that the person is nearby; the control module 3 is connected with the relay control circuit 4 and used for responding to the induction signal OUT0 and outputting a control signal OUT representing the opening, when the induction signal OUT0 is received, the control signal OUT is transmitted to the relay control circuit 4, and the relay control circuit 4 outputs an opening signal to control the illuminating lamp to start working; when the induction signal OUT0 is not received, the control module 3 outputs a control signal OUT representing closing to the relay control circuit 4, the relay control circuit 4 outputs a closing signal, and a circuit controlled by a relay switch does not work or stops working.
Whether personnel walk or not is sensed through the sensing module 2, the control module 3 controls the relay to work, so that a circuit controlled by a relay switch works under a specific condition, automatically works when people exist, is automatically closed when no people exist, and the effect of automatic switching is realized.
Referring to fig. 2, the sensing module 2 includes a microwave power input terminal VIN, a ground terminal GND connected to the power circuit module 1, and an output terminal OUT; the sensing module 2 is used for sensing whether a person exists in a preset range, and if the person exists in the preset range, the output end OUT outputs a sensing signal OUT 0.
The control signal OUT which is output by the control module 3 and is used for indicating the starting comprises a first control signal OUT1 with a high level and a second control signal OUT2 with a low level; the control signal OUT output by the control module 3, which indicates turn-off, includes a first control signal OUT1 of low level and a second control signal OUT2 of high level.
The relay control circuit 4 receives the 12V voltage output by the power circuit module 1 to work, when the relay control circuit 4 is in a working state, the relay control circuit outputs an opening signal when receiving a control signal OUT which is output by the control module 3 and is characterized by opening, the illuminating lamp responds to the opening signal to light up, and responds to the closing signal to extinguish.
Specifically, the control module 3 has a power input terminal VDD, a sensing signal input terminal P07, a first control signal output terminal P13 and a second control signal output terminal P06; the power input end VDD is connected with the power circuit module 1 and adopts 3.3V voltage for power supply.
The sensing signal input end P07 is connected with a seventh triode Q7, the seventh triode Q7 is an NPN-type triode, the collector of the seventh triode Q7 is connected with the sensing signal input end P07, the emitter of the seventh triode Q7 is grounded, the base of the seventh triode Q7 is connected with a twenty-third resistor R23, and the other end of the twenty-third resistor R23 is connected with the output end OUT of the sensing module 2; the first control signal output end P13 is connected with the relay control circuit 4 and outputs a first control signal OUT 1; the second control signal output terminal PO6 outputs a second control signal OUT 2.
When people exist in a preset range, the sensing module 2 sends OUT a sensing signal OUT0, and the control module 3 responds to the sensing signal OUT0 to output a control signal OUT representing starting; when no person is in the preset range, the sensing module 2 does not send OUT the sensing signal OUT0, and the control module 3 outputs the control signal OUT representing the closing.
Referring to fig. 3, the relay control circuit 4 includes a relay, a 12V regulator ZD2, a third transistor Q3, and a second switching element including a fourth transistor Q4, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11; one end of a ninth resistor R9 is connected with the base electrode of the third triode Q3, and the other end of the ninth resistor R9 is connected with the emitter electrode of the third triode Q3; the third triode Q3 is a PNP triode, the collector of the third triode Q3 is connected with the anode of a 12V voltage-regulator tube ZD2, and the cathode of the 12V voltage-regulator tube ZD2 is connected with the power circuit module 1; one end of a coil of the relay is connected with the cathode of a 12V voltage-regulator tube ZD2, and the other end of the coil of the relay is connected with the emitter of a third triode Q3; the base of the third triode Q3 is connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is connected to the collector of the fourth triode Q4, the fourth triode Q4 is an NPN-type triode, the emitter of the fourth triode Q4 is grounded, the base of the fourth triode Q4 is connected to one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the first control signal output terminal P13 of the control module 3, and receives the first control signal OUT1 output by the first control signal output terminal P13.
When a person is in a preset range, the control module 3 outputs a control signal OUT representing the opening, the first control signal OUT1 with high level controls the conduction of the fourth triode Q4 and the third triode Q3, the coil of the relay is connected with the power circuit module 1, 12V working voltage is received, the relay control circuit 4 outputs an opening signal, and a circuit controlled by the relay switch normally works.
When no person exists in the preset range, the control module 3 outputs a control signal OUT representing closing, the control signal OUT is transmitted to the third triode Q3 and the fourth triode Q4, the fourth triode Q4 and the third triode Q3 are cut off, the coil of the relay is not electrified, a closing signal is output, and a circuit controlled by the relay switch does not work.
Referring to fig. 3, the power circuit module 1 is connected with a municipal power supply, receives 220V alternating current, and is used for generating 12V voltage to supply power to a coil of a relay, 5V voltage to supply power to the induction module 2, and 3.3V voltage to supply power to the control module 3; the power circuit module 1 includes a voltage step-down unit, a rectifying unit, and a voltage conversion circuit.
Specifically, the voltage dropping unit includes a fuse F1, a third resistor R3, a fourth resistor R4, and a fifth capacitor C5; 220V alternating current flows into a fuse F1, the other end of the fuse F1 is connected with a third resistor R3, a fourth resistor R4 and a fifth capacitor C5 are connected in parallel, and the other end of the third resistor R3 far away from the fuse F1 is connected with the fuse F; the voltage reduction unit is used for reducing voltage of a municipal power supply, namely 220V alternating current, and generating low-voltage alternating current in the range of 20V to 25V.
The rectification unit is an integrated full-bridge rectification circuit module and comprises a first input end, a second input end, a positive polarity output end and a negative polarity output end; the first input end is connected with a terminal interface of a municipal power supply, the second input end is connected with one end, far away from the third resistor R3, of the fourth resistor R4, and the low-voltage alternating current is rectified and converted into low-voltage direct current; the positive polarity output end of the rectifying unit is connected with the cathode of a 12V voltage regulator tube ZD2 of the relay control circuit 4, and the negative polarity output end of the rectifying unit is grounded; the rectifying unit rectifies the low-voltage alternating current into low-voltage direct current in a range of 20V to 24V, and outputs the low-voltage direct current to a subsequent circuit.
The voltage conversion circuit includes a 12V voltage conversion circuit 11, a 5V voltage conversion circuit 12, and a 3.3V voltage conversion circuit 13, the 12V voltage conversion circuit 11 including a first switching element including a first transistor Q1, a second transistor Q2, a second resistor R2, a first polarity capacitor C1, a sixth resistor R6, and an eighth resistor R8; the first triode Q1 is a PNP triode, the emitter of the first triode Q1, the positive output terminal of the rectifying unit, the positive electrode of the first capacitor C1 and the cathode of the 12V zener diode ZD2 in the relay control circuit 4 are connected to a point, the collector of the first triode Q1, the negative electrode of the first capacitor C1 and the collector of the third triode Q3 in the relay control circuit 4 are connected to a point, the base of the first triode Q1 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the collector of the second triode Q2; the second triode Q2 is an NPN type triode, an emitter of the second triode Q2 is grounded, a base of the second triode Q2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the second control signal output end P06 of the control module 3, and responds to the second control signal OUT 2; one end of the second resistor R2 is connected to the emitter of the first transistor Q1, the other end of the second resistor R2 is connected to the base of the first transistor Q1, the positive pole of the first polarity capacitor C1 is connected to the emitter of the first transistor Q1, and the negative pole of the first polarity capacitor C1 is connected to the collector of the first transistor Q1.
The 5V voltage conversion circuit 12 includes a first resistor R1, a 5V regulator ZD1, and a fourth polarity capacitor C4; one end of a first resistor R1 is connected with a collector of a first triode Q1, the other end of the first resistor R1 is connected with a cathode of a 5V voltage-regulator tube ZD1, an anode of the 5V voltage-regulator tube ZD1 is grounded, an anode of a fourth polarity capacitor C4 is connected with a cathode of the 5V voltage-regulator tube ZD1, a cathode of a fourth polarity capacitor C4 is grounded, and the 5V voltage-regulator tube ZD1 outputs 5V direct-current voltage to supply power for the induction module 2.
And the 5V voltage conversion circuit 12 is used for receiving the current flowing through the 12V voltage conversion circuit 11, stabilizing the potential of the cathode of the 5V voltage regulator tube ZD1 at 5V and outputting the potential after the 5V voltage regulator tube ZD1 is broken down by utilizing the breakdown characteristic of the voltage regulator tube, and supplying power to the induction module 2 and the 3.3V voltage conversion circuit 13.
Specifically, when no person is in the preset range, the sensing module 2 cannot detect human body information and does not send OUT a sensing signal OUT0, the control module 3 outputs a control signal OUT representing closing, and the third triode Q3 and the fourth triode Q4 are cut off and are not conducted; meanwhile, the base electrode of the second triode Q2 of the 12V voltage conversion circuit 11 receives a high level, the second triode Q2 is conducted, the collector electrode and the emitter electrode of the second triode Q2 are approximately short-circuited, so that the first triode Q1 is conducted, low-voltage direct current rectified by the rectifying unit flows into the 5V voltage conversion circuit 12 through the emitter electrode and the collector electrode of the first triode Q1, the voltage at two ends of the 5V voltage regulator tube ZD1 is stabilized at 5V through the 5V voltage regulator tube ZD1, at this time, the coil of the relay control circuit 4 is not electrified, and the relay switch keeps a disconnected state.
When a person is in a preset range, the induction module 2 detects human body information and sends OUT an induction signal OUT0, the control module 3 receives the induction signal OUT0 and outputs a control signal OUT representing the turning-on, the relay control circuit 4 responds to the first control signal OUT1 to be at a high level, the fourth triode Q4 and the third triode Q3 are conducted, the 12V voltage conversion circuit 11 responds to the second control signal OUT2 to be at a low level, the second triode Q2 and the first triode Q1 are cut off, and the emitter and the collector of the first triode Q1 are approximately disconnected.
At the moment, the first triode Q1 and the second triode Q2 are cut off, the current output by the rectifying unit cannot flow to the 12V voltage-regulator tube ZD2 through the first triode Q1, the voltage at the two ends of the 12V voltage-regulator tube ZD2 is regulated to 12V, the current flows into a coil of the relay at the same time, the coil of the relay is electrified, the relay switch is closed, a circuit controlled by the relay switch normally works, and the voltage at the two ends of the relay is equal to the voltage at the two ends of the 12V voltage-regulator tube ZD2, namely 12V; the current flowing through the coil of the relay is transmitted to the 5V voltage conversion circuit 12 through a passage between the collector of the third triode Q3 and the emitter of the third triode Q3, 5V voltage drop is formed on the 5V voltage-regulator tube ZD1, the 5V voltage-regulator tube ZD1 and the coil of the relay are connected in series between the positive polarity output end of the rectifying unit and the ground, the voltage of the positive polarity output end of the rectifying unit is 17V at the moment, when a person exists, the voltage at two ends of the 12V voltage-regulator tube ZD2 is stabilized at 12V to supply power for the coil of the relay and is transmitted to a subsequent circuit, and the effect of controlling the on-off of the relay is achieved.
Through the control of adopting two way control signal, both guaranteed that there is sufficient voltage and the work of current drive relay when someone, can reduce the electric current that flows on 12V stabilivolt ZD2 when nobody again, extension 12V stabilivolt ZD 2's life, and when someone and nobody the homoenergetic for the back level control circuit supplements the electric energy, makes response module 2 can detect whether someone in succession, and makes control module 3 can continue to work and respond to response module 2's sensing signal OUT 0.
The 3.3V voltage conversion circuit 13 includes an LDO chip, a second polarity capacitor C2, and a third non-polarity capacitor C3; the LDO (low dropout regulator) chip is a low-voltage linear regulator and comprises a voltage-stabilizing input end VIN, a voltage-stabilizing output end OUT and a ground end GND, wherein the voltage-stabilizing input end VIN is connected with the cathode of a 5V voltage-stabilizing tube ZD1 and is powered by 5V voltage, and the voltage-stabilizing output end OUT outputs 3.3V voltage to power the control module 3; the positive polarity end of the second polarity capacitor C2 is connected with the voltage stabilizing output end OUT of the LDO chip, and the other end of the second polarity capacitor C2 is grounded; one end of the third nonpolar capacitor C3 is connected to the voltage-stabilizing output end OUT of the LDO chip, the other end of the third nonpolar capacitor C3 is grounded, and the voltage-stabilizing output end OUT outputs 3.3V voltage to supply power to the control module 3.
The 3.3V voltage conversion circuit 13 utilizes the LDO chip to stabilize the 5V voltage to 3.3V and output it to power the control module 3.
Referring to fig. 4, the relay switch control circuit disclosed in the application of the embodiment of the present application further includes a zero-crossing detection circuit 5, connected to the power circuit module 1 and the control module 3, for detecting a zero-crossing point of the alternating current. The zero-crossing detecting circuit 5 includes a first diode D1, a fifteenth resistor R15, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a sixth transistor Q6.
The collector of the sixth triode Q6 is connected to the control module 3, the emitter of the sixth triode Q6 is grounded, the base is connected to one end of a twentieth resistor R20, the other end of the twentieth resistor R20 is connected to a twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, one end of a nineteenth resistor R19 is connected to a fifteenth resistor R15, the other end is connected to one end of the twenty-first resistor R21 far from the ground, one end of the fifteenth resistor R15 far from the nineteenth resistor R19 is connected to the cathode of a first diode D1, and the anode of the first diode D1 is connected to one end of the first fuse F1 of the voltage dropping unit, which is connected to the third resistor R3, and is used for receiving 220V alternating current.
When the 220V alternating current is in the positive half cycle, that is, the anode of the first diode D1 is connected to the high level, the first diode D1 is turned on, the base of the sixth triode Q6 is at the high level to be turned on, the emitter and the collector are approximately short-circuited, the collector of the sixth triode Q6 outputs the low level, and during the positive half cycle, the collector of the sixth triode Q6 continuously outputs the low level.
When the 220V alternating current is in the negative half cycle, that is, the anode voltage of the first diode D1 is less than the cathode voltage, the first diode D1 is turned off, the base voltage of the sixth triode Q6 is at a low level, the sixth triode Q6 is turned off, an open circuit is approximately formed between the emitter and the collector of the sixth triode Q6, the collector output of the sixth triode Q6 is at a high level, and during the negative half cycle, the collector of the sixth triode Q6 continuously outputs a high level.
In the process of conducting the positive and negative half cycles of the 220V alternating current alternately, the collector of the sixth triode Q6 outputs a pulse signal with alternating high and low levels, and the pulse signal is transmitted to the control module 3; the control module 3 responds to the pulse signal and is used for capturing the moment of high and low level alternation; after receiving the sensing signal OUT0, the control module 3 outputs a control signal OUT representing the start-up at the moment of capturing the alternation of high and low levels; the control module 3 is used for setting the delay time, and in the delay time, the first control signal OUT1 is kept at a high level, and the second control signal OUT2 is kept at a low level, so that a coil of the relay is electrified in the set delay time, and a circuit controlled by a relay switch works normally; if the sensing module 2 senses that someone exists again within the delay time, timing is restarted; when the sensing module 2 senses that no one exists, timing is not carried OUT, after the delay time is over, the first control signal OUT1 is changed into low-level output, the second control signal OUT2 is changed into high-level output, the relay coil is not electrified, and the switch is switched off.
By adopting the zero crossing point detection circuit 5, the switch of the relay is closed when the voltage crosses the zero point, so that the generation of sparks is effectively reduced, the temperature rise of the normal work of the relay is reduced, the service life of the relay is prolonged, and the relay can work more safely and effectively.
The principle of the embodiment of the application is as follows: the power circuit module 1 provides 12V voltage for the relay control circuit 4, 3.3V voltage for the induction module 2 and 5V voltage for the control module 3; the sensing module 2 senses whether a person exists in a preset range, and if the person exists in the preset range, the sensing module outputs a sensing signal OUT0, the control module 3 responds to the sensing signal OUT0 and outputs a control signal OUT representing opening, and the control signal OUT representing opening comprises a first control signal OUT1 with a high level and a second control signal OUT2 with a low level; if no person exists in the preset range, the control module outputs a control signal OUT representing closing, wherein the control signal OUT representing closing comprises a first control signal OUT1 with low level and a second control signal OUT2 with high level; when a person is present, the first control signal OUT1 controls the coil of the relay control circuit 4 to be electrified, the switch is closed, the illuminating lamp starts to work, and when no person is present, the first control signal OUT1 controls the coil of the relay not to be electrified, the switch is disconnected, and the illuminating lamp does not work.
In the power circuit module 1, 220V alternating current is converted into a direct current signal through the voltage reduction unit and the rectification unit, when a person is not detected in the induction module 2, the first triode Q1 and the second triode Q2 are conducted, the third triode Q3 and the fourth triode Q4 are cut off, direct current passes through a collector and an emitter of a first triode Q1 in the 12V voltage conversion circuit 11, the current does not generate voltage drop when passing through the 12V voltage conversion circuit, then flows into the 5V voltage conversion circuit 12, voltage is stabilized at 5V through the 5V voltage stabilizing tube ZD1, a 5V voltage signal is output, and power is supplied to the induction module 2 and the 3.3V voltage conversion circuit 13; the current continuously flows to the 3.3V voltage conversion circuit 13, the 5V voltage is stabilized to 3.3V through the LDO chip, and a 3.3V voltage signal is output to supply power for the control module 3; since the third transistor Q3 and the fourth transistor Q4 are turned off, the relay coil is not energized and the relay switch is open.
When the induction module 2 senses a person, at the moment when the zero crossing point detection circuit 5 detects the zero crossing of the alternating current voltage, the control module 3 outputs an opening control signal and keeps a certain time delay, the first triode Q1 and the second triode Q2 are cut off during the time delay, the third triode Q3 and the fourth triode Q4 are conducted, the direct current output by the rectifying unit is stabilized to 12V through the 12V voltage stabilizing tube ZD2 of the relay control circuit 4, the voltage at two ends of the 12V voltage stabilizing tube ZD2 is stabilized to 12V, the voltage at two ends of the coil of the relay is stabilized to 12V, the current flowing through the coil of the relay flows into the 5V voltage stabilizing tube ZD1 and then flows into the ground, a 5V voltage drop is formed through the 5V voltage stabilizing tube ZD1, a 17V voltage is generated at two ends of the coil K1 and the 5V voltage stabilizing tube ZD1, at the moment, the switch of the relay is closed, and the load starts to work; the induction module 2 and the 3.3V voltage conversion circuit 13 are connected with the cathode of a 5V voltage regulator tube ZD1 and receive 5V voltage; the current continuously flows into the 3.3V voltage conversion circuit 13 to output 3.3V voltage, so as to supply power to the control module 3.
When people exist, 12V, 5V and 3.3V voltages are generated through the voltage conversion circuit, the 12V voltage is used for electrifying the relay coil to enable the relay switch to work, 5V is used for supplying power to the induction module 2, and 3.3V is used for supplying power to the control module 3; when no person is in use, 5V voltage and 3.3V voltage are generated under the control of the control module 3, current does not flow through a coil of the relay, the switch of the relay does not work, the effect of automatic switch control is achieved, meanwhile, two-way control is adopted, when the system does not work, the current of the 12V voltage stabilizing tube ZD2 can be reduced, and the service life of the 12V voltage stabilizing tube ZD2 is prolonged.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (7)
1. The utility model provides a relay switch control circuit, includes relay control circuit (4) and power supply circuit module (1), and power supply circuit module (1) is relay control circuit (4) power supply, and the break-make of relay control circuit (4) control relay place circuit, its characterized in that still includes:
the sensing module (2) is connected with the power circuit module (1) and is used for sensing whether a person exists in a preset range or not, and if yes, outputting a sensing signal OUT 0;
the control module (3) is connected with the power circuit module (1) and the sensing module (2), receives the sensing signal OUT0, outputs a control signal OUT representing on, and outputs a control signal OUT representing off when the sensing signal OUT0 is not received;
the relay control circuit (4) is connected to the control module (3), responds to a control signal OUT representing opening to control the switch of the relay to be closed, and responds to a control signal OUT representing closing to control the switch of the relay to be opened.
2. The relay switch control circuit of claim 1, wherein:
a power supply circuit module (1) is provided with: a 12V voltage conversion circuit (11), a 5V voltage conversion circuit (12), and a 3.3V voltage conversion circuit (13);
the 12V voltage conversion circuit (11) is connected to the control module (3), responds to a control signal OUT representing opening, outputs 12V voltage to the relay control circuit (4), and is connected with the 5V voltage conversion circuit (12);
the 5V voltage conversion circuit (12) is connected with the induction module (2) and is used for outputting 5V voltage to 3.3V voltage conversion circuit (13) and the induction module (2);
the 3.3V voltage conversion circuit (13) is connected with the 5V voltage conversion circuit (12) and used for outputting 3.3V voltage and supplying power for the control module (3).
3. A relay switch control circuit according to claim 2, wherein the power circuit module (1) comprises a voltage step-down unit, a rectifying unit and a voltage converting circuit;
the voltage reduction unit is used for reducing the voltage of the 220V alternating current and outputting a low-voltage alternating current signal;
the rectifying unit is connected with the voltage reduction unit and is used for rectifying the low-voltage alternating current signal into low-voltage direct current;
the rectifying unit is connected with the voltage conversion circuit and transmits the low-voltage direct current to the voltage conversion circuit.
4. The relay switch control circuit of claim 3,
the rectifying unit comprises a positive polarity output end and a negative polarity output end, and the negative polarity output end is grounded;
the 5V voltage conversion circuit (12) comprises a 5V voltage regulator tube ZD1 and a fourth polarity capacitor C4, wherein the cathode of the 5V voltage regulator tube ZD1 is connected with the anode of the fourth polarity capacitor C4; the anode of the 5V voltage-regulator tube ZD2 is connected with the cathode of the fourth-polarity capacitor C4; the cathode of the 5V voltage-stabilizing tube ZD1 is connected with the positive polarity output end of the rectifying unit;
the 3.3V voltage conversion circuit (13) comprises an LDO chip, a second polarity capacitor C2 and a third non-polarity capacitor C3, wherein the LDO chip is a three-port element, one end of the LDO chip is connected with the cathode of a 5V voltage regulator tube ZD1, one end of the LDO chip is grounded, the other end of the LDO chip is connected with the anode of a second polarity capacitor C2, the cathode of a second polarity capacitor C2 is grounded, and the third non-polarity capacitor C3 is connected with the second polarity capacitor C2 in parallel.
5. The relay switch control circuit of claim 4,
the 12V voltage conversion circuit (11) includes a first switching element;
the relay control circuit (4) includes a second switching element;
the first switching element is used for outputting an off state when responding to a control signal OUT representing the opening; the second switching element is used for outputting a closed state when responding to a control signal OUT representing opening;
the first switching element is used for outputting a closed state when responding to a control signal OUT representing closing; the second switching element is used for outputting an off state when responding to a control signal OUT representing closing;
specifically, the first switching element is connected between the positive polarity output end of the rectifying unit and the cathode of the 5V voltage regulator tube ZD 1;
the relay control circuit (4) further comprises a relay and a 12V voltage regulator tube ZD 2;
one end of a coil of the relay is connected with the positive polarity output end of the rectifying unit, the other end of the coil of the relay is connected with one end of a second switching element, the other end of the second switching element is connected with the anode of a 12V voltage-regulator tube ZD2, and the cathode of the 12V voltage-regulator tube ZD2 is connected with the positive polarity output end of the rectifying unit.
6. The relay switch control circuit according to claim 5, wherein the first switching element comprises a first transistor Q1, a first resistor R1, a second resistor R2, a first polarity capacitor C1, a sixth resistor R6, a second transistor Q2, and an eighth resistor R8;
the first triode Q1 is a PNP type triode, the second triode Q2 is an NPN type triode, the emitter of the first triode Q1 is connected with the positive polarity output end of the rectifying unit, the collector of the first triode Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the cathode of the 5V voltage regulator tube, the base of the first triode Q1 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is connected with one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected with the control module (3); the positive electrode of the first polarity capacitor C1 is connected with the emitter electrode of the first triode Q1, and the negative electrode of the first polarity capacitor C1 is connected with the collector electrode of the first triode Q1; an emitter of the first triode Q1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with a base electrode of the first triode Q1;
the second switching element includes a third transistor Q3, a ninth resistor R9, a tenth resistor R10, a fourth transistor Q4, and an eleventh resistor R11;
the third triode Q3 is a PNP triode, the fourth triode Q4 is an NPN triode, an emitter of the third triode Q3 is connected to one end of a coil of the relay, which is far away from the rectifying unit, a collector of the third triode Q3 is connected to an anode of a 12V voltage regulator ZD2, a base of the third triode Q3 is connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is connected to a collector of the fourth triode Q4, an emitter of the fourth triode Q4 is grounded, a base of the fourth triode Q4 is connected to one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the control module (3) and is used for receiving a control signal OUT; one end of the ninth resistor R9 is connected to the emitter of the third transistor Q3, and the other end is connected to the base of the third transistor Q3.
7. A relay switch control circuit according to claim 1, characterized in that it further comprises a zero crossing detection circuit (5);
the zero-crossing detection circuit (5) includes a first diode D1, a fifteenth resistor R15, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a sixth triode Q6;
the anode of the first diode D1 is connected with the power supply circuit module (1), the cathode of the first diode D1 is connected with one end of a nineteenth resistor R19 through a fifteenth resistor R15, the other end of the nineteenth resistor R19 is connected with one end of a twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, and one end of the twentieth resistor R20 is connected with one end of the nineteenth resistor R19 close to the twenty-first resistor R21; the other end of the twentieth resistor R20 is connected to the base of the sixth triode Q6, the emitter of the sixth triode Q6 is grounded, and the collector of the sixth triode Q6 is connected to the control module (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122533823.9U CN216437536U (en) | 2021-10-20 | 2021-10-20 | Relay switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122533823.9U CN216437536U (en) | 2021-10-20 | 2021-10-20 | Relay switch control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216437536U true CN216437536U (en) | 2022-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122533823.9U Active CN216437536U (en) | 2021-10-20 | 2021-10-20 | Relay switch control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN216437536U (en) |
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2021
- 2021-10-20 CN CN202122533823.9U patent/CN216437536U/en active Active
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