Control circuit for reducing power of relay coil

Abstract

The utility model discloses a control circuit for reducing the power of a relay coil, which comprises a power supply voltage switching circuit, the power supply voltage switching circuit comprises a diode D1, a triode Q1 and a triode Q2, the emitting electrode of the triode Q1 is connected with a 12V power supply, the positive electrode of the diode D1 is connected with a 7V power supply circuit, and the negative electrode of the triode Q2 is connected with the 7V power supply circuit. The negative electrode of the diode D1 and the collector electrode of the triode Q1 are both connected with the relay coil control circuit, the base electrode of the triode Q1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the collector electrode of the triode Q2, the base electrode of the triode Q2 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the MCU microprocessor. According to the utility model, when the contact of the relay K1 needs to be closed, the 12V power supply is used for supplying power, and after the contact of the relay K1 is closed, the 7V power supply circuit is used for supplying power to keep the contact of the relay K1 closed, so that the power consumption of a relay coil is reduced, and the control stability of the relay is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to relay coil power control technical field, specifically related to a control circuit that reduces relay coil power. BACKGROUND

[0002] With the development of electronic control technology, high-power relays are widely used in electronic products, and the reliability and stability of relay control are important parameters for product design.

[0003] At present, the coil resistance of high-power relays is small, and the action driving current is large. The conventional control mode of relays is designed with a rated working power supply, resulting in large relay driving power consumption and high coil temperature rise, which can easily cause serious heating and affect the reliability of the system during long-term operation.

[0004] Therefore, there is an urgent need for a control circuit that reduces relay coil power, which reduces the power supply voltage of the relay coil after the contact of the relay is closed, thereby reducing the power consumption of the relay coil and improving the stability of the relay control. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a control circuit that reduces relay coil power to solve the problems raised in the above background technology. The control circuit that reduces relay coil power provided by the utility model has the characteristics of reducing the power consumption of the relay coil and improving the stability of the relay control.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a control circuit that reduces relay coil power, including a power supply voltage switching circuit, the power supply voltage switching circuit includes a diode D1, a triode Q1 and a triode Q2, wherein the emitter of the triode Q1 is connected with a 12V power supply, the anode of the diode D1 is connected with a 7V power supply circuit, the cathode of the diode D1 and the collector of the triode Q1 are connected with a relay coil control circuit, the base of the triode Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector of a triode Q2, the base of the triode Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a MCU microprocessor, and the emitter of the triode Q2 is connected with a GND end.

[0007] In order to provide a static bias voltage, further, the resistor R2 is connected between the emitter and the base of the triode Q1.

[0008] In order to provide a static bias voltage, further, the resistor R8 is connected between the emitter and the base of the triode Q2.

[0009] In order to reduce the +12V power supply output by the 12V power supply to +7V power supply voltage, further, the 7V power supply circuit comprises an adjustable voltage stabilizing chip U1, the 3-pin of the adjustable voltage stabilizing chip U1 is connected with the 12V power supply, one end of the 4-pin of the adjustable voltage stabilizing chip U1 is connected with the resistor R1, the other end of the resistor R1 is connected with the resistor R4 and the 1-pin of the adjustable voltage stabilizing chip U1 respectively, the other end of the resistor R4 is connected with the GND terminal, and the 2-pin of the adjustable voltage stabilizing chip U1 is connected with the positive terminal of the diode D1.

[0010] In order to realize the filtering of the input and output terminals, further, the 3-pin of the adjustable voltage stabilizing chip U1 is also connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the GND terminal, the 2-pin of the adjustable voltage stabilizing chip U1 is also connected with one end of the capacitor C2 and the capacitor C3 respectively, and the other ends of the capacitor C2 and the capacitor C3 are connected with the GND terminal.

[0011] In order to control the relay K1, further, the relay coil control circuit comprises a triode Q3 and the relay K1, wherein the base of the triode Q3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the MCU microprocessor, the emitter of the triode Q3 is connected with the GND terminal, the collector of the triode Q3 is connected with the 1-pin of the relay K1, and the 2-pin of the relay K1 is connected with the negative terminal of the diode D1 and the collector of the triode Q1.

[0012] In order to provide a discharge channel of the reverse potential of the relay K1 coil, further, the collector of the triode Q3 is also connected with the positive terminal of the voltage stabilizing diode D2, and the negative terminal of the voltage stabilizing diode D2 is connected with the 2-pin of the relay K1.

[0013] In order to provide a static bias voltage, further, the resistor R7 is connected between the base and the emitter of the triode Q3.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The utility model discloses when needing the contact of the relay K1 to close, by 12V power supply, when the contact of the relay K1 is closed, by 7V power supply circuit to supply power to keep the contact of the relay K1 to close, thereby the power consumption of the relay coil is reduced, and the stability of the relay control is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the circuit connection block diagram of the utility model;

[0017] Fig. 2 It is the circuit diagram of the utility model power supply voltage switching circuit and relay coil control circuit;

[0018] Fig. 3The utility model discloses a 7V power supply circuit's circuit diagram.

[0019] In the drawing: 1, 12V power supply; 2, 7V power supply circuit; 3, relay coil control circuit; 4, MCU microprocessor; 5, power supply voltage switching circuit. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0021] Embodiment 1

[0022] Please refer to Figs. 1-3 The utility model provides the following technical scheme: a control circuit that reduces the power of relay coil, including power supply voltage switching circuit 5, power supply voltage switching circuit 5 includes diode D1, triode Q1 and triode Q2, wherein, the emitter of triode Q1 is connected with 12V power supply 1, the positive pole of diode D1 is connected with 7V power supply circuit 2, the negative pole of diode D1 and the collector of triode Q1 are connected with relay coil control circuit 3, the base of triode Q1 is connected with one end of resistance R3, the other end of resistance R3 is connected with the collector of triode Q2, the base of triode Q2 is connected with one end of resistance R5, the other end of resistance R5 is connected with the PTD1 foot of MCU microprocessor 4, the emitter of triode Q2 is connected with GND end, and the model of MCU microprocessor 4 is MKE02Z16VLC2.

[0023] By adopting the above technical scheme, when the contact of relay K1 needs to be closed, the 12V power supply 1 is powered, and after the contact of relay K1 is closed, the 7V power supply circuit 2 is powered to keep the contact of relay K1 closed, thereby reducing the power consumption of the relay coil and improving the stability of the relay control.

[0024] Specifically, the emitter and the base of triode Q1 are connected with resistance R2.

[0025] By adopting the above technical scheme, static bias voltage is provided for triode Q1.

[0026] Specifically, the emitter and the base of triode Q2 are connected with resistance R8.

[0027] By adopting the above technical scheme, static bias voltage is provided for triode Q2.

[0028] Specifically, the 7V power supply circuit 2 comprises an adjustable voltage stabilizing chip U1, the model of the adjustable voltage stabilizing chip U1 is LM1117-ADJ, the 3-pin of the adjustable voltage stabilizing chip U1 is connected with the 12V power supply, one end of the 4-pin of the adjustable voltage stabilizing chip U1 is connected with the resistor R1, the other end of the resistor R1 is connected with the resistor R4 and the 1-pin of the adjustable voltage stabilizing chip U1 respectively, the other end of the resistor R4 is connected with the GND terminal, the 2-pin of the adjustable voltage stabilizing chip U1 is connected with the positive terminal of the diode D1, and the resistor R1 and the resistor R2 provide an output reference voltage for the adjustable voltage stabilizing chip U1.

[0029] By adopting the above technical scheme, the +12V power supply output by the 12V power supply 1 is stepped down to a +7V power supply voltage.

[0030] Specifically, the relay coil control circuit 3 comprises a triode Q3 and a relay K1, wherein the base of the triode Q3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the PTD2 pin of the MCU microprocessor 4, the emitter of the triode Q3 is connected with the GND terminal, the collector of the triode Q3 is connected with the 1-pin of the relay K1, and the 2-pin of the relay K1 is connected with the negative terminal of the diode D1 and the collector of the triode Q1.

[0031] By adopting the above technical scheme, the control of the relay K1 is realized.

[0032] Specifically, the resistor R7 is connected between the base and the emitter of the triode Q3.

[0033] By adopting the above technical scheme, the static bias voltage is provided for the triode Q3.

[0034] Embodiment 2

[0035] The difference between the embodiment and the embodiment 1 is that: specifically, the 3-pin of the adjustable voltage stabilizing chip U1 is further connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the GND terminal, the 2-pin of the adjustable voltage stabilizing chip U1 is further connected with one end of the capacitor C2 and the capacitor C3 respectively, and the other ends of the capacitor C2 and the capacitor C3 are connected with the GND terminal.

[0036] By adopting the above technical scheme, the capacitor C1 filters the input end of the adjustable voltage stabilizing chip U1, and the capacitor C2 and the capacitor C3 filter the output of the adjustable voltage stabilizing chip U1.

[0037] Embodiment 3

[0038] The difference between the embodiment and the embodiment 1 is that: specifically, the collector of the triode Q3 is further connected with the positive terminal of the voltage stabilizing diode D2, and the negative terminal of the voltage stabilizing diode D2 is connected with the 2-pin of the relay K1.

[0039] By adopting the technical scheme, a discharge channel of the reverse potential of the relay K1 coil is provided.

[0040] The GND end is a negative end of the 12V power supply.

[0041] The steps for controlling the relay K1 are as follows:

[0042] (1), in the initial state, the MCU microprocessor PTD2 foot output low level, triode Q3 cut-off, relay K1 no drive current, relay K1 output contact is in the release state; MCU microprocessor PTD1 foot output high level, triode Q2 and triode Q1 are in the on state, diode D1 is in the reverse cut-off state, the relay K1 is powered by 12V power supply;

[0043] (2), when the contact of the relay K1 needs to be closed, the MCU microprocessor PTD2 foot output high level, triode Q3 saturation conduction, +12V power supply voltage through the drive coil of the relay K1 and triode Q3 to ground conduction, the drive coil of the relay K1 gets the drive current, the contact of the relay K1 is closed;

[0044] (3), when the MCU microprocessor PTD2 foot output high level 100ms, MCU microprocessor PTD1 foot is switched from high level to low level, triode Q2 and triode Q1 are in the cut-off state, diode D1 is forward biased, 7V power supply circuit outputs +7V power supply voltage, +7V power supply voltage through the coil of the relay K1 and triode Q3 to ground conduction, so as to maintain low voltage to power the coil of the relay K1, so that the contact of the relay K1 remains closed;

[0045] (4), when the contact of the relay K1 needs to be opened, when the MCU microprocessor PTD2 foot is switched to low level, the MCU microprocessor PTD1 foot is switched to high level.

[0046] In summary, when the contact of the relay K1 needs to be closed, the 12V power supply 1 is powered, and after the contact of the relay K1 is closed, the 7V power supply circuit 2 is powered to maintain the closure of the contact of the relay K1, thereby reducing the power consumption of the relay coil and improving the stability of the relay control.

[0047] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A control circuit for reducing the power of a relay coil, characterized by: The power supply voltage switching circuit comprises a diode D1, a triode Q1 and a triode Q2, wherein the emitter of the triode Q1 is connected with a 12V power supply, the anode of the diode D1 is connected with a 7V power supply circuit, the cathode of the diode D1 and the collector of the triode Q1 are connected with a relay coil control circuit, the base of the triode Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector of the triode Q2, the base of the triode Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with an MCU microprocessor, and the emitter of the triode Q2 is connected with a GND terminal.

2. The control circuit for reducing power of a relay coil according to claim 1, characterized in that: The emitter and the base of the triode Q1 are connected with a resistor R2.

3. The control circuit for reducing power of a relay coil according to claim 1, characterized in that: The emitter and the base of the triode Q2 are connected with a resistor R8.

4. The control circuit for reducing power of a relay coil according to claim 1, characterized in that: The 7V power supply circuit comprises an adjustable voltage stabilizing chip U1, the 3-pin of the adjustable voltage stabilizing chip U1 is connected with a 12V power supply, one end of a resistor R1 is connected with the 4-pin of the adjustable voltage stabilizing chip U1, the other end of the resistor R1 is connected with a resistor R4 and the 1-pin of the adjustable voltage stabilizing chip U1, respectively, the other end of the resistor R4 is connected with a GND terminal, and the 2-pin of the adjustable voltage stabilizing chip U1 is connected with the anode of the diode D1.

5. The control circuit for reducing power of a relay coil according to claim 4, characterized in that: The 3-pin of the adjustable voltage stabilizing chip U1 is also connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with a GND terminal, the 2-pin of the adjustable voltage stabilizing chip U1 is also connected with one end of a capacitor C2 and one end of a capacitor C3, respectively, and the other ends of the capacitor C2 and the capacitor C3 are connected with a GND terminal.

6. The control circuit for reducing power of a relay coil according to claim 1, characterized in that: The relay coil control circuit comprises a triode Q3 and a relay K1, wherein the base of the triode Q3 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with an MCU microprocessor, the emitter of the triode Q3 is connected with a GND terminal, the collector of the triode Q3 is connected with the 1-pin of the relay K1, and the 2-pin of the relay K1 is connected with the cathode of the diode D1 and the collector of the triode Q1.

7. The control circuit for reducing power of a relay coil according to claim 6, characterized in that: The collector of the triode Q3 is also connected with the anode of a voltage stabilizing diode D2, and the cathode of the voltage stabilizing diode D2 is connected with the 2-pin of the relay K1.

8. The control circuit for reducing power of a relay coil according to claim 6, characterized in that: The base and the emitter of the triode Q3 are connected with a resistor R7.

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