CN217983209U - Single-coil magnetic latching relay drive circuit with power-off state self-resetting function - Google Patents
Single-coil magnetic latching relay drive circuit with power-off state self-resetting function Download PDFInfo
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- CN217983209U CN217983209U CN202121777065.9U CN202121777065U CN217983209U CN 217983209 U CN217983209 U CN 217983209U CN 202121777065 U CN202121777065 U CN 202121777065U CN 217983209 U CN217983209 U CN 217983209U
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Abstract
The utility model discloses a single coil magnetic latching relay drive circuit with outage state is from restoring to throne function in the power electronics field, including the first drive unit on the power of electricity connection, first drive unit is connected with second drive unit electricity, and second drive unit is connected with the output pin electricity, and other the connecing the charging unit between first drive unit and the power, the utility model discloses not only can realize that CPU is to the on-off control of magnetic latching relay when system's normal operating, have the advantage that the on-off state of system's outage back magnetic latching relay can reset by oneself moreover.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to single coil magnetic latching relay drive circuit.
Background
The on-off control of the circuit has wide application in the technical field of power electronics, for example, in a power electronic converter with a capacitor at the direct current side, a certain current-limiting resistor is generally required to be connected in series at the capacitor pre-charging stage, and the current-limiting resistor is bypassed after the pre-charging is finished; for example, in the field of on-load voltage regulation based on a power electronic switch, in order to avoid damage to the power electronic switch due to overvoltage caused when the transformer is switched on, a corresponding terminal is usually required to be short-circuited at the moment of switching on. In recent years, magnetic latching relays have been widely used for on-off control in the power electronics field.
However, although the magnetic latching relay has a larger volume advantage compared to the contactor, it also brings certain inconvenience, such as the determination of the on-off state of the contactor after the system power off, that is, the normally closed type contacts are closed and the normally open type contacts are opened. Since the change of the on-off state of the magnetic latching relay needs to be triggered by a control signal, the magnetic latching relay can only maintain the on-off state at the moment before the system is powered off, and the on-off state of the magnetic latching relay after the system is powered off is expected to be determined in application, for example, a switch is generally required to be in an off state after the power is off in a direct current side capacitor charging current limiting circuit of a power electronic converter, and a switch is required to be in an on state after the power is off in an on-load tap changer application based on the power electronic switch, which brings great inconvenience to the application of the magnetic latching relay to a power electronic system.
SUMMERY OF THE UTILITY MODEL
To exist not enough among the prior art, the utility model provides a single coil magnetic latching relay drive circuit with outage state is from reset function can realize resetting by oneself after the outage, makes its control more convenient.
The purpose of the utility model is realized like this: a single-coil magnetic latching relay driving circuit with a power-off state self-resetting function comprises a first driving unit electrically connected with a power supply, wherein the first driving unit is electrically connected with a second driving unit which is electrically connected with an output pin, and a charging unit is connected between the first driving unit and the power supply;
the first driving unit comprises a first relay coil, a first relay first selection contact, a first relay second selection contact and a first control circuit, wherein the first control circuit is used for controlling the first coil to be powered on or powered off, a normally open end of the first relay first selection contact is connected with a power supply, a normally closed end of the first relay first selection contact is connected with the ground, and a normally open end of the first relay second selection contact is connected with the ground and a normally closed end of the first relay second selection contact is connected with the power supply;
the second driving unit comprises a second relay coil, a second relay first selection contact and a second control circuit, the second control circuit is used for controlling the second coil to be electrified or not electrified, and the normally open end of the second relay first selection contact is connected with the common end of the first relay first selection contact;
the output pin includes a first terminal and a second terminal, the first terminal is connected with the common end of the first selection contact of the second relay, and the second terminal is connected with the common end of the second selection contact of the first relay.
As a further improvement of the present invention, the first control circuit includes a first resistor, a first diode, and a first triode, the first resistor and the first diode are connected in anti-parallel at two ends of the first relay coil, an electrode between the first resistor and the first relay coil is connected to a power supply, the first triode is short-circuited between the first diode and the first relay coil, and a base of the first triode is used as a control end of the first control circuit; the second control circuit comprises a second resistor, a second diode and a second triode, the second resistor and the second diode are connected at two ends of a second relay coil in an anti-parallel mode, an electrode between the second resistor and the second relay coil is connected with a power supply in a contact mode, the second triode is connected between the second diode and the second relay coil in a short mode, and a base of the second triode serves as a control end of the second control circuit.
As the utility model discloses a further improvement, the unit of charging includes third resistance, third diode and electric capacity, and the positive pole power connection of third diode, negative pole connect the first selection contact's of first relay end and the one end of third resistance in usual respectively, and the other end of third resistance is through electric capacity ground connection.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses simple structure, CPU to magnetic latching relay's on-off control when not only can realizing the system normal operating has the advantage that the on-off state of system's outage back magnetic latching relay can reset by oneself moreover.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a driving circuit diagram of the single-coil magnetic latching relay of the present invention.
Fig. 2 is a wiring diagram of the magnetic latching relay when the magnetic latching relay is reset to the conducting state after power failure.
Fig. 3 is a wiring diagram of the magnetic latching relay when the magnetic latching relay is reset to an off state after power failure.
Fig. 4 is the control flow chart of the magnetic latching relay of the present invention for the state of the magnetic latching relay under the connection mode of the magnetic latching relay that is reset to the on state after power-off.
Fig. 5 is a control flow chart of the external CPU to the state of the magnetic latching relay in the wiring mode of the magnetic latching relay in the off state after the power is cut off.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The circuit comprises an S1 first relay coil, an S2 second relay coil, a 6 normally-open end, an 8 normally-closed end, an R1 first resistor, an R2 second resistor, an R3 third resistor, a D1 first diode, a D2 second diode, a D3 third diode, a Q1 first triode, a Q2 second triode, a C capacitor, an Out1 first terminal and an Out2 second terminal;
the single-coil magnetic latching relay driving circuit with the power-off state self-resetting function as shown in fig. 1 comprises a first driving unit electrically connected to a +24V power supply, the first driving unit is electrically connected to a second driving unit, the second driving unit is electrically connected to an output pin, and a charging unit is connected between the first driving unit and the +24V power supply;
the first driving unit comprises a first relay K1 coil S1, a first selection contact of the first relay K1, a second selection contact of the first relay K1 and a first control circuit, wherein the first control circuit is used for controlling the first coil to be powered on or powered off, a normally open end 6 of the first selection contact of the first relay K1 is connected with a +24V power supply, a normally closed end 8 of the first selection contact of the first relay K1 is grounded, and a normally open end 11 of the second selection contact of the first relay K1 is grounded, and a normally closed end 9 of the second selection contact of the first relay K1 is connected with the +24V power supply; the first control circuit comprises a first resistor R1, a first diode D1 and a first triode Q1, the first resistor R1 and the first diode D1 are connected In anti-parallel with two ends of a first relay K1 coil S1, an electrode point between the first resistor R1 and the first relay K1 coil S1 is connected with a +24V power supply, the first triode Q1 is In short circuit between the first diode D1 and the first relay K1 coil S1, and a base electrode of the first triode Q1 is used as a control end In1 of the first control circuit;
the second driving unit comprises a coil S2 of a second relay K2, a first selection contact of the second relay K2 and a second control circuit, the second control circuit is used for controlling the second coil to be electrified or not electrified, and a normally open end 6 of the first selection contact of the second relay K2 is connected with a common end 4 of the first selection contact of the first relay K1; the second control circuit comprises a second resistor R2, a second diode D2 and a second triode Q2, the second resistor R2 and the second diode D2 are connected In anti-parallel with two ends of a coil S2 of the second relay K2, an electrode point between the second resistor R2 and the coil S2 of the second relay K2 is connected with a +24V power supply, the second triode Q2 is short-circuited between the second diode D2 and the coil S2 of the second relay K2, and a base electrode of the second triode Q2 is used as a control end In2 of the second control circuit;
the output pin comprises a first terminal Out1 and a second terminal Out2, the first terminal Out1 is connected with a common end 4 of a first selection contact of the second relay K2, and the second terminal Out2 is connected with a common end 13 of a second selection contact of the first relay K1;
the charging unit comprises a third resistor R3, a third diode D3 and a capacitor C, the anode of the third diode D3 is connected with a +24V power supply, the cathode of the third diode D3 is respectively connected with the normally open end 6 of the first selection contact of the first relay K1 and one end of the third resistor R3, and the other end of the third resistor R3 is grounded through the capacitor C.
The +24V power supply charges the capacitor C through the third diode D3 and the third resistor R3 when the system normally operates, the voltage on the capacitor C is about 24V after charging is finished, the third diode D3 has the function of ensuring that a path for supplying energy to a circuit outside the magnetic latching relay through the third resistor R3 by the capacitor C is cut off after the system is powered off, the condition that the energy storage on the capacitor C is used for resetting the state of the magnetic latching relay to the maximum extent is ensured, and the requirement for the capacity of the energy storage capacitor C is reduced. The other group of normally closed contacts 11 in the first relay K1 with two groups of switching functions is connected with the control ground; and the other two groups of corresponding contact 8 pins and 9 pins are respectively connected with a control ground and a +24V driving power supply, and when the system normally operates, an external CPU can control the voltage between the common contacts 4 and 13 In the first relay K1 with two groups of conversion functions to be +24V or-24V respectively by adjusting the high-low level state of an In2 input pin. The common contact 4 in the first relay K1 with two groups of conversion functions is connected in series with one group of normally closed contacts in the second relay K2 with two groups of conversion functions and then connected to an output pin Out1 of the driving circuit, and the common contact 13 in the first relay K1 with two groups of conversion functions is connected to an output pin Out2 of the driving circuit.
According to different demands among the practical application, a can realize that single coil magnetic latching relay cuts off power supply after the state from drive circuit and the single coil magnetic latching relay control end of reset function have two kinds of connected modes. When the magnetic latching relay is reset to be in a conducting state after power failure, the connection mode of the driving circuit and the control end of the magnetic latching relay is shown in fig. 2, namely, an Out1 pin of the driving circuit is connected with a conducting pin of the magnetic latching relay, and an Out2 pin of the driving circuit is connected with a disconnecting pin of the magnetic latching relay. The power-off reset principle is as follows: the system normally operates to charge the capacitor C, when the system is powered off, the +24V power supply is lost by the driving circuit, so that the coils of the first relay K1 and the second relay K2 with two groups of conversion functions are both powered off, the states of the contacts of the K1 and the K2 are states shown in the figure 2, at the moment, the capacitors C and R3 form a discharge loop through the contact 6 and the contact 4 of the first relay K1, the contact 6 and the contact 4 of the second relay K2, the conduction pin of the magnetic latching relay and the disconnection pin of the magnetic latching relay, and the state of the magnetic latching relay is adjusted to be in a conduction state. When the magnetic latching relay is reset to the off state after power failure, the connection mode of the driving circuit and the control end of the magnetic latching relay is shown in fig. 3, that is, an Out1 pin of the driving circuit is connected with an off pin of the magnetic latching relay, and an Out2 pin of the driving circuit is connected with an on pin of the magnetic latching relay. The power-off reset principle is as follows: the system normally operates to charge the capacitor C, when the system is powered off, the +24V power supply is lost by the driving circuit, so that the coils of the first relay K1 and the K2 with two groups of conversion functions are both powered off, the states of the contacts of the K1 and the K2 are states shown in the figure 3, at the moment, the capacitors C and R3 form a discharge loop through the contact 6 and the contact 4 of the first relay K1, the contact 6 and the contact 4 of the second relay K2, the disconnection pin of the magnetic latching relay and the conduction pin of the magnetic latching relay, and the state of the magnetic latching relay is adjusted to be in a disconnection state.
As shown in fig. 4, it is a control flow chart of the external CPU to the state of the magnetic latching relay when the magnetic latching relay is reset to the conducting state after the power is cut off, i.e. when the system operates normally in the wiring mode shown in fig. 2; when an external CPU judges that a conduction instruction exists, firstly setting In2 as a high level, a first relay K1 coil is de-energized, then setting In1 as a high level, and a second relay K2 coil is de-energized, at the moment, a +24V driving power supply returns to a control power supply ground through a third diode D3, pins 6 and 4 of the first relay K1, pins 6 and 4 of the second relay K2, a conduction pin of a magnetic latching relay and a disconnection pin of the magnetic latching relay, the magnetic latching relay is In a conduction state after about 200ms of delay, and finally setting In1 as a low level, and energizing the K2 coil to disconnect the pins 4 and 6 of the second relay K2, so that the control voltage is prevented from being applied to a control end of the magnetic latching relay for a long time to cause damage to the magnetic latching relay; when an external CPU judges that a disconnection instruction exists, in2 is set to be low level, a first relay K1 coil is electrified, then In1 is set to be high level, a second relay K2 coil is not electrified, at the moment, a +24V driving power supply returns to a control power supply ground through pins 9 and 13 of the first relay K1, a disconnection pin of a magnetic latching relay, a conduction pin of the magnetic latching relay, pins 4 and 6 of the second relay K2 and pins 4 and 8 of the first relay K1, the magnetic latching relay is In a disconnection state after about 200ms of time delay, finally In1 is set to be low level, the K2 coil is electrified, pins 4 and 6 of the second relay K2 are disconnected, and the situation that control voltage is applied to a control end of the magnetic latching relay for a long time to cause damage to the magnetic latching relay is avoided.
As shown in fig. 5, it is a control flow chart of the external CPU to the state of the magnetic latching relay when the magnetic latching relay is reset to the off state after the power is cut off, i.e. when the system operates normally in the wiring mode shown in fig. 3; when an external CPU judges that a conduction instruction exists, firstly, setting In2 as a low level, electrifying a coil of a first relay K1, then setting In1 as a high level, and deenergizing a coil of a second relay K2, wherein at the moment, a +24V driving power supply returns to a control power supply ground through pins 9 and 13 of the first relay K1, an on pin of a magnetic latching relay, an off pin of the magnetic latching relay, pins 4 and 6 of the second relay K2 and pins 4 and 8 of the first relay K1, the magnetic latching relay is In an on state after about 200ms of delay, finally setting In1 as a low level, electrifying the coil of the second relay K2, and disconnecting the pins 4 and 6 of the second relay K2 to avoid the control voltage from being applied to a control end of the magnetic latching relay for a long time to cause damage to the magnetic latching relay; when an external CPU judges that a disconnection instruction exists, firstly, the In2 is set to be at a high level, the coil of the first relay K1 is de-energized, then the In1 is set to be at the high level, the coil of the second relay K2 is de-energized, at the moment, a +24V driving power supply returns to a control power supply ground through the third diode D3, the pins 6 and 4 of the first relay K1, the pins 6 and 4 of the second relay K2, the disconnection pin of the magnetic latching relay and the conduction pin of the magnetic latching relay, the magnetic latching relay is In a disconnection state after about 200ms of time delay, finally, the In1 is set to be at a low level, the coil K2 is energized, the pins 4 and 6 of the second relay K2 are disconnected, and the situation that control voltage is applied to the control end of the magnetic latching relay for a long time to cause the damage of the magnetic latching relay is avoided.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (3)
1. A single-coil magnetic latching relay drive circuit with a power-off state self-reset function is characterized by comprising a first drive unit electrically connected with a power supply, wherein the first drive unit is electrically connected with a second drive unit which is electrically connected with an output pin, and a charging unit is connected between the first drive unit and the power supply;
the first driving unit comprises a first relay coil, a first relay first selection contact, a first relay second selection contact and a first control circuit, wherein the first control circuit is used for controlling the first coil to be powered on or powered off, a normally open end of the first relay first selection contact is connected with a power supply, a normally closed end of the first relay first selection contact is connected with the ground, and a normally open end of the first relay second selection contact is connected with the ground and a normally closed end of the first relay second selection contact is connected with the power supply;
the second driving unit comprises a second relay coil, a second relay first selection contact and a second control circuit, the second control circuit is used for controlling the second coil to be electrified or not electrified, and the normally open end of the second relay first selection contact is connected with the common end of the first relay first selection contact;
the output pin includes a first terminal and a second terminal, the first terminal is connected with the common end of the first selection contact of the second relay, and the second terminal is connected with the common end of the second selection contact of the first relay.
2. The single-coil magnetic latching relay drive circuit with the power-off state self-resetting function according to claim 1, wherein the first control circuit comprises a first resistor, a first diode and a first triode, the first resistor and the first diode are connected in anti-parallel with two ends of a first relay coil, an electrode between the first resistor and the first relay coil is connected with a power supply, the first triode is connected between the first diode and the first relay coil in a short-circuit mode, and a base of the first triode serves as a control end of the first control circuit; the second control circuit comprises a second resistor, a second diode and a second triode, the second resistor and the second diode are connected at two ends of a second relay coil in an anti-parallel mode, an electrode between the second resistor and the second relay coil is connected with a power supply in a point mode, the second triode is connected between the second diode and the second relay coil in a short mode, and a base electrode of the second triode serves as a control end of the second control circuit.
3. The driving circuit of a single-coil magnetic latching relay with a power-off state self-resetting function according to claim 1 or 2, wherein the charging unit comprises a third resistor, a third diode and a capacitor, wherein the anode of the third diode is connected with the power supply, the cathode of the third diode is respectively connected with the normally open end of the first selection contact of the first relay and one end of the third resistor, and the other end of the third resistor is grounded through the capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121777065.9U CN217983209U (en) | 2021-08-02 | 2021-08-02 | Single-coil magnetic latching relay drive circuit with power-off state self-resetting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121777065.9U CN217983209U (en) | 2021-08-02 | 2021-08-02 | Single-coil magnetic latching relay drive circuit with power-off state self-resetting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217983209U true CN217983209U (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121777065.9U Active CN217983209U (en) | 2021-08-02 | 2021-08-02 | Single-coil magnetic latching relay drive circuit with power-off state self-resetting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217983209U (en) |
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2021
- 2021-08-02 CN CN202121777065.9U patent/CN217983209U/en active Active
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