Magnetic latching relay control circuit and magnetic latching relay

Abstract

The utility model discloses a magnetic latching relay control circuit and a magnetic latching relay, and relates to the technical field of magnetic latching relay control, the control circuit comprises a first switch unit, a second switch unit, an energy storage unit, a third switch unit and a main control circuit; the main control circuit controls the first switch unit and the second switch unit to be switched on and the third switch unit to be switched off to form a closed loop so that the magnetic latching relay can be switched on, or controls the first switch unit and the second switch unit to be switched off, the third switch unit to be switched on and the energy storage unit to supply power to form an open loop so that the magnetic latching relay can be switched off. Therefore, the magnetic latching relay is disconnected. Therefore, the main control circuit can output a control signal to control the magnetic latching relay to be switched on or switched off, and can control the magnetic latching relay to be switched off when the power supply suddenly stops and is powered off.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic latching relay control, particularly relates to a magnetic latching relay control circuit and magnetic latching relay. BACKGROUND

[0002] The existing method for controlling the magnetic latching relay is usually through a bridge circuit, a high and a low two signals are sent by MCU to control the turn-on and turn-off of two groups of MOS tubes, so as to drive the magnetic latching relay. The MCU controller needs two control signals, and the timing of the control signal is required, the magnetic latching relay cannot be driven for a long time, otherwise it will be burned out, if the software control is abnormal, the power supply will be short-circuited, and the device will be burned out. Therefore, the requirement for software control is high, and the difficulty and complexity of software are increased. UTILITY MODEL CONTENT

[0003] The utility model discloses a magnetic latching relay control circuit and magnetic latching relay, and aims at solving the problem that the controller often needs the time sequence control signal for driving when controlling the magnetic latching relay, and the requirement for software control is too high.

[0004] To achieve the above object, the utility model provides a magnetic latching relay control circuit, the magnetic latching relay control circuit includes:

[0005] The first end of the first switch unit is used for connecting the power supply, and the second end of the first switch unit is connected with the first end of the relay coil;

[0006] The first end of the second switch unit is connected with the second end of the relay coil, and the second end of the second switch unit is grounded;

[0007] The energy storage unit is connected in series between the first switch unit and the relay coil;

[0008] The first end of the third switch unit is connected with the first end of the energy storage unit, and the second end of the third switch unit is connected with the second end of the relay coil;

[0009] The signal output end of the main control circuit is connected with the first switch unit, the second switch unit and the third switch unit respectively, and the main control circuit is used for controlling the conduction of the first switch unit and the second switch unit and the cut-off of the third switch unit, so that the magnetic latching relay is closed, or the cut-off of the first switch unit and the second switch unit and the conduction of the third switch unit are controlled, so that the magnetic latching relay is disconnected.

[0010] In an embodiment, the first switch unit comprises:

[0011] a first resistor, a second resistor, a first transistor, a diode and a first PMOS transistor;

[0012] a first end of the first resistor and a source of the first PMOS transistor are electrically connected to the power supply connection end, a second end of the first resistor and a gate of the first PMOS transistor are electrically connected to a collector of the first transistor, a base of the first transistor is electrically connected to a first end of the second resistor, a second end of the second resistor is electrically connected to a signal output end of the master control circuit, an emitter of the first transistor is grounded, a drain of the first PMOS transistor is electrically connected to an anode of the diode, and a cathode of the diode is electrically connected to a first end of the relay coil through the energy storage unit.

[0013] In an embodiment, the second switch unit comprises:

[0014] a NMOS transistor and a third resistor;

[0015] a drain of the NMOS transistor is electrically connected to a second end of the relay coil, a gate of the NMOS transistor is electrically connected to a first end of the third resistor, a second end of the third resistor is electrically connected to the signal output end of the master control circuit, and a source of the NMOS transistor is grounded.

[0016] In an embodiment, the energy storage unit comprises:

[0017] a polarity capacitor;

[0018] a positive pole of the polarity capacitor is electrically connected to the second end of the first switch unit, and a negative pole of the polarity capacitor is electrically connected to the first end of the relay coil.

[0019] In an embodiment, the third switch unit comprises:

[0020] a fourth resistor, a fifth resistor, a sixth resistor, a second transistor, a third transistor and a second PMOS transistor;

[0021] The source of the second PMOS tube, the first end of the fourth resistor and the first end of the fifth resistor are connected to a circuit between the second end of the first switch unit and the first end of the energy storage unit, the drain of the second PMOS tube is connected to a circuit between the second end of the relay coil and the first end of the second switch unit, the gate of the second PMOS tube is electrically connected with the second end of the fourth resistor and the source of the second transistor, the base of the second transistor is electrically connected with the second end of the fifth resistor and the source of the third transistor, the base of the third transistor is electrically connected with the first end of the sixth resistor, the second end of the sixth resistor is electrically connected with the signal output end of the main control circuit, and the emitter of the second transistor and the emitter of the third transistor are grounded.

[0022] In an embodiment, the polarized capacitor is an electrolytic capacitor.

[0023] The utility model discloses still propose a kind of magnetic latching relay, the magnetic latching relay includes the magnetic latching relay control circuit as described above.

[0024] The technical scheme of the utility model discloses a kind of magnetic latching relay control circuit, the magnetic latching relay control circuit includes: first switch unit, the first end of the first switch unit is used to connect power supply, the second end of the first switch unit is connected with the first end of the relay coil;Second switch unit, the first end of the second switch unit is connected with the second end of the relay coil;The second end of the second switch unit is grounded;Energy storage unit, the energy storage unit is connected between the first switch unit and the relay coil;Third switch unit, the first end of the third switch unit is connected with the first end of the energy storage unit, and the second end of the third switch unit is connected with the second end of the relay coil;Main control circuit, the signal output end of the main control circuit is electrically connected with the first switch unit, second switch unit and the third switch unit respectively;The main control circuit is used to control the first switch unit and the second switch unit conduction, third switch unit cut-off, to make the magnetic latching relay close, or, control the first switch unit and second switch unit cut-off, third switch unit conduction, to make the magnetic latching relay open. So that the first switch unit and the second switch unit conduction, third switch unit cut-off, closed loop is formed in the magnetic latching relay control circuit, control the magnetic latching relay close, or control the first switch unit and second switch unit cut-off, third switch unit conduction, energy storage unit power supply in the magnetic latching relay control circuit, to form open circuit so that the magnetic latching relay opens, so it can make that main control circuit can output a control signal just can control magnetic latching relay close or open, and still can control magnetic latching relay open when power supply is suddenly stopped. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Fig. 1 A system block diagram of an embodiment of the magnetic latching relay control circuit provided by this utility model;

[0027] Fig. 2 A detailed circuit structure diagram of an embodiment of the magnetic latching relay control circuit provided by this utility model.

[0028] Explanation of icon numbers:

[0029] 1. First switching unit; 2. Second switching unit; 3. Energy storage unit; 4. Magnetic latching relay; 5. Third switching unit; 6. Main control circuit; R1-R6, first resistor - sixth circuit; Q1, first PMOS transistor; Q2, NMOS transistor; Q3, first transistor; Q4, second PMOS transistor; Q5, second transistor; Q6, third transistor; D1, diode; C1, polarized capacitor; VCC - power supply connection terminal.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0034] The utility model provides a kind of magnetic latching relay control circuit.

[0035] Please refer to Figs. 1-2 In an embodiment of the utility model, the magnetic latching relay control circuit comprises:

[0036] The first end of the first switching unit 1 is used to connect to the power supply, and the second end of the first switching unit 1 is connected to the first end of the relay coil K14.

[0037] The first end of the second switching unit 2 is connected to the second end of the relay coil K14, and the second end of the second switching unit 2 is grounded.

[0038] The energy storage unit 3 is connected in series between the first switching unit 1 and the relay coil K14.

[0039] The first end of the third switching unit 5 is connected to the first end of the energy storage unit, and the second end of the third switching unit 5 is connected to the second end of the relay coil K14.

[0040] The signal output end of the main control circuit 6 is respectively connected to the first switching unit 1, the second switching unit 2 and the third switching unit 5, and the main control circuit 6 is used to control the first switching unit 1 and the second switching unit 2 to be turned on, and the third switching unit 5 to be turned off, so that the magnetic latching relay 4 is closed, or the first switching unit 1 and the second switching unit 2 are turned off, and the third switching unit 5 is turned on, so that the magnetic latching relay 4 is disconnected.

[0041] In the embodiment, the first switch unit 1, the second switch unit 2 and the third switch unit 5 can be set as transistors, the energy storage unit 3 can be set as a polar capacitor C1, the main control circuit 6 can be realized by a main controller such as an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), an SOC (System On Chip) and the like, and specifically, when the main control circuit 6 outputs a signal such as a pulse signal or a level signal, the first switch unit 1, the second switch unit 2 and the third switch unit 5 receive the signal, so that the first switch unit 1 and the second switch unit 2 are turned on and the third switch unit 5 is turned off, a closed loop is formed in the magnetic latching relay control circuit, the energy storage unit 3 is controlled to charge, and the magnetic latching relay 4 is controlled to be closed, and when the main control circuit 6 stops outputting the signal such as the pulse signal or the level signal or the power supply is powered off, the first switch unit 1 and the second switch unit 2 are turned off and the third switch unit 5 is turned on, the energy storage unit 3 in the magnetic latching relay control circuit is powered, an open loop is formed to make the magnetic latching relay 4 open, so that the magnetic latching relay control circuit can close or open the magnetic latching relay 4 by one control signal, the timing of the control signal is not required, and the power supply short circuit caused by the abnormal software control of the main control circuit 6 can be avoided.

[0042] Further, the first switch unit 1 comprises:

[0043] a first resistor R1, a second resistor R2, a first triode Q3, a diode D1 and a first PMOS Q1;

[0044] The first end of the first resistor R1 and the source of the first PMOS Q1 are electrically connected with the power supply connection end VCC, the second end of the first resistor R1 and the gate of the first PMOS Q1 are electrically connected with the collector of the first triode Q3, the base of the first triode Q3 is electrically connected with the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected with the signal output end of the main control circuit 6, the emitter of the first triode Q3 is grounded, the drain of the first PMOS Q1 is electrically connected with the anode of the diode D1, and the cathode of the diode D1 is electrically connected with the first end of the relay coil K14 through the energy storage unit 3.

[0045] Specifically, the power supply outputs through the power supply connection end VCC, when the master control circuit 6 outputs the control signal, the power supply provides the level to the gate of the first PMOS tube Q1, due to the first triode Q3 being turned on and grounded, the level of the gate of the first PMOS tube Q1 is pulled down, the first PMOS tube Q1 is turned on, and due to the power supply passing through the diode D1, the voltage can be prevented from flowing back to the power supply connection end VCC, or when the power supply is suddenly powered off or the master control circuit 6 stops outputting the control signal, the first triode Q3 is cut off, the power supply pulls up the level on the gate of the first PMOS tube Q1, and the first PMOS tube Q1 is cut off.

[0046] The second switch unit 2 comprises:

[0047] The NMOS tube Q2 and the third resistor R3;

[0048] The drain of the NMOS tube Q2 is electrically connected to the second end of the relay coil K14, the gate of the NMOS tube Q2 is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected to the signal output end of the master control circuit 6, and the source of the NMOS tube Q2 is grounded.

[0049] Specifically, the NMOS tube Q2 is turned on under the output of the control signal, or when the power supply is suddenly powered off or the master control circuit 6 stops outputting the control signal, the NMOS tube Q2 is cut off.

[0050] The energy storage unit 3 comprises:

[0051] The polar capacitor C1;

[0052] The positive electrode of the polar capacitor C1 is electrically connected to the second end of the first switch unit 1, and the negative electrode of the polar capacitor C1 is electrically connected to the first end of the relay coil K14.

[0053] Specifically, the polar capacitor C1 is an electrolytic capacitor. When the power supply flows through the relay coil K14, the polar capacitor C1 is charged, and when the power supply stops supplying power, the polar capacitor C1 can release the charged electric energy from the positive electrode direction, that is, it can supply power to the loop formed inside the magnetic latching relay control circuit.

[0054] The third switch unit 5 comprises:

[0055] The fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the second triode Q5, the third triode Q6, and the second PMOS tube Q4;

[0056] The source of the second PMOS tube Q4, the first end of the fourth resistance R4 and the first end of the fifth resistance R5 are connected to the circuit between the second end of the first switch unit 1 and the first end of the energy storage unit 3, the drain of the second PMOS tube Q4 is connected to the circuit between the second end of the relay coil K14 and the first end of the second switch unit 2, the gate of the second PMOS tube Q4 is electrically connected with the second end of the fourth resistance R4 and the source of the second triode Q5, the base of the second triode Q5 is electrically connected with the second end of the fifth resistance R5 and the source of the third triode Q6, the base of the third triode Q6 is electrically connected with the first end of the sixth resistance R6, the second end of the sixth resistance R6 is electrically connected with the signal output end of the main control circuit 6, and the emitter of the second triode Q5 and the emitter of the third triode Q6 are grounded.

[0057] Specifically, when the main control circuit 6 outputs the control signal, the power supply makes the level in the gate of the second PMOS tube Q4 high, so that the second PMOS tube Q4 is cut off, and the electric energy provided by the power supply is released through the second triode Q5 and the third triode Q6, or when the main control circuit 6 outputs the control signal, or the power supply is suddenly powered off or the main control circuit 6 stops outputting the control signal, the second PMOS tube Q4 is turned on.

[0058] In summary, the magnetic latching relay control circuit can make the first PMOS tube Q1 and the NMOS tube Q2 conductive when the main control circuit 6 outputs the control signal, the second PMOS tube Q4 is cut off, the electric energy provided by the power supply is output to the relay coil K14 and the polarity capacitor C1 through the first PMOS tube Q1, and then released through the NMOS tube Q2 grounded, at this time the first end of the relay coil K14 is a positive voltage, the second end of the relay coil K14 is grounded, that is, a closed loop is formed inside the control circuit, so that the magnetic latching relay is closed, or when the power supply is suddenly powered off or the main control circuit 6 stops outputting the control signal, the first PMOS tube Q1 and the NMOS tube Q2 are cut off, the second PMOS tube Q4 is turned on, and the electric energy charged by the polarity capacitor C1 flows to the relay coil K14 through the second PMOS tube Q4 and then returns to the negative electrode of the polarity capacitor C1, that is, an open loop is formed, at this time the second end of the relay coil K14 is a positive voltage, and the first end of the relay coil K14 is equivalent to being grounded, wherein the diode D1 can prevent the reverse flow of the charging electric energy of the polarity capacitor C1 to the power supply connection end VCC.

[0059] The utility model discloses a technical scheme which adopts a magnetic latching relay control circuit, and the magnetic latching relay control circuit comprises: a first switch unit, a first end of the first switch unit is used for accessing a power supply, and a second end of the first switch unit is connected with a first end of a relay coil; a second switch unit, a first end of the second switch unit is connected with a second end of the relay coil; a second end of the second switch unit is grounded; an energy storage unit, the energy storage unit is connected in series between the first switch unit and the relay coil; a third switch unit, a first end of the third switch unit is connected with a first end of the energy storage unit, and a second end of the third switch unit is connected with a second end of the relay coil; a master control circuit, signal output ends of the master control circuit are electrically connected with the first switch unit, the second switch unit and the third switch unit respectively; the master control circuit is used for controlling the first switch unit and the second switch unit to be turned on and the third switch unit to be turned off, so that the magnetic latching relay is closed, or the master control circuit is used for controlling the first switch unit and the second switch unit to be turned off and the third switch unit to be turned on, so that the magnetic latching relay is disconnected. Therefore, the first switch unit and the second switch unit are turned on, the third switch unit is turned off, a closed loop is formed in the magnetic latching relay control circuit, the magnetic latching relay is controlled to be closed, or the first switch unit and the second switch unit are turned off, the third switch unit is turned on, the energy storage unit in the magnetic latching relay control circuit is powered, and an open loop is formed to disconnect the magnetic latching relay. In this way, the master control circuit can output a control signal to control the magnetic latching relay to be closed or disconnected, and the magnetic latching relay can be controlled to be disconnected when the power supply is suddenly stopped.

[0060] The utility model also provides a magnetic latching relay, and the magnetic latching relay comprises the magnetic latching relay control circuit as described above. The specific structure is referred to the above embodiment. Since the subject two adopts all the technical schemes of the above-mentioned embodiments, at least has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, and here will not be repeated.

[0061] The above-mentioned is only the exemplary implementation of the utility model, and does not limit the patent range of the utility model, and all equivalent structural transformations made by using the utility model specification and the drawings contents or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A magnetic latching relay control circuit, characterized by, The magnetic latching relay control circuit comprises: A first switch unit, a first end of the first switch unit is used for accessing a power supply, and a second end of the first switch unit is connected with a first end of a relay coil; A second switch unit, a first end of the second switch unit is connected with a second end of the relay coil, and a second end of the second switch unit is grounded; An energy storage unit, the energy storage unit is arranged in series between the first switch unit and the relay coil; A third switch unit, a first end of the third switch unit is connected with a first end of the energy storage unit, and a second end of the third switch unit is connected with a second end of the relay coil; A master control circuit, signal output ends of the master control circuit are respectively connected with the first switch unit, the second switch unit and the third switch unit; the master control circuit is used for controlling the first switch unit and the second switch unit to be turned on and the third switch unit to be turned off, so that the magnetic latching relay is closed, or the master control circuit is used for controlling the first switch unit and the second switch unit to be turned off and the third switch unit to be turned on, so that the magnetic latching relay is opened.

2. The magnetic latching relay control circuit of claim 1, wherein, The first switch unit comprises: A first resistor, a second resistor, a first triode, a diode and a first PMOS tube; A first end of the first resistor and a source of the first PMOS tube are connected with a power supply connection end, a second end of the first resistor and a gate of the first PMOS tube are connected with a collector of the first triode, a base of the first triode is connected with a first end of the second resistor, a second end of the second resistor is connected with a signal output end of the master control circuit, an emitter of the first triode is grounded, a drain of the first PMOS tube is connected with an anode of the diode, and a cathode of the diode is connected with the first end of the relay coil through the energy storage unit.

3. The magnetic latching relay control circuit of claim 1, wherein, The second switch unit comprises: An NMOS tube and a third resistor; A drain of the NMOS tube is connected with the second end of the relay coil, a gate of the NMOS tube is connected with a first end of the third resistor, a second end of the third resistor is connected with the signal output end of the master control circuit, and a source of the NMOS tube is grounded.

4. The magnetic latching relay control circuit of claim 1, wherein, The energy storage unit comprises: A polarity capacitor; A positive electrode of the polarity capacitor is connected with the second end of the first switch unit, and a negative electrode of the polarity capacitor is connected with the first end of the relay coil.

5. The magnetic latching relay control circuit of claim 1, wherein, The third switch unit comprises: A fourth resistor, a fifth resistor, a sixth resistor, a second triode, a third triode and a second PMOS tube; The source of the second PMOS tube, the first end of the fourth resistor and the first end of the fifth resistor are connected to the circuit between the second end of the first switch unit and the first end of the energy storage unit, the drain of the second PMOS tube is connected to the circuit between the second end of the relay coil and the first end of the second switch unit, the gate of the second PMOS tube is electrically connected with the second end of the fourth resistor and the source of the second triode, the base of the second triode is electrically connected with the second end of the fifth resistor and the source of the third triode, the base of the third triode is electrically connected with the first end of the sixth resistor, the second end of the sixth resistor is electrically connected with the signal output end of the main control circuit, and the emitter of the second triode and the emitter of the third triode are grounded.

6. The magnetic latching relay control circuit of claim 4, wherein, The polarity capacitor is an electrolytic capacitor.

7. A magnetic latching relay characterized by, The magnetic latching relay comprises the magnetic latching relay control circuit according to any one of claims 1 to 6.

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