Double-coil permanent magnetic mechanism control circuit

Abstract

The invention relates to a double-coil permanent magnetic mechanism control circuit. The double-coil permanent magnetic mechanism control circuit comprises a controller connected with a power supply, a rectifier bridge D1, an auxiliary node, permanent magnetic mechanism coils, a fly-wheel diode D12, a driving circuit Drv, a switching tube T1, a solid-state relay U1, a resistor R11, a voltage stabilizing diode D3 and the like. A capacitance module and a charging module in an original driving device can be replaced by a physical circuit, an alternating current power supply is directly adopted as an input power supply, the size is small, and installation is convenient. Specifically, by means of the intervention of a driving circuit Drv, a switching tube T1 on a loop where a permanent magnetic mechanism coil is located can be controlled under specific conditions, the operation can be continuously kept for preset time after power failure, and closing can be kept in place.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric control circuit, in particular to a double-coil permanent magnet mechanism control circuit. BACKGROUND

[0002] The description in this part only provides background information related to the present application disclosure, and does not constitute prior art.

[0003] The permanent magnet mechanism is used as the driving device of the switch electric appliance, and can be divided into single coil and double coil according to the number of coils, wherein the double coil mechanism has two coils of opening and closing, and the corresponding coil is energized to realize the opening and closing operation, the single coil mechanism has only one coil, and the coil is energized in one direction to realize the closing operation, and the coil is energized in the other direction to realize the opening operation. Whether it is a single coil mechanism or a double coil mechanism, a special driving device is needed to realize the opening and closing operation, and the driving device is generally composed of three parts, one is a driving control module, which is used to realize the control coil energizing time; the second is an energy storage capacitor module, which is used to provide the opening and closing energy. The third is a charging module, which is used to charge the energy storage capacitor. Because a special driving device is needed, for the compact switch device, a control circuit with small size and convenient installation needs to be designed.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application, and for the convenience of understanding by those skilled in the art. The above technical scheme cannot be considered as known by those skilled in the art only because it is described in the background of the present application. SUMMARY

[0005] The purpose of the present application is to provide a double-coil permanent magnet mechanism control circuit, which can replace the capacitor module and charging module in the original driving device by physical circuit, directly use alternating current power supply as input power supply, small size, convenient installation.

[0006] In order to achieve the above purpose, the present application discloses a double-coil permanent magnet mechanism control circuit, which comprises a controller connected with a power supply, a rectifier bridge D1, an auxiliary node, a permanent magnet mechanism coil, a freewheeling diode D12, a drive circuit Drv, a switch tube T1, a solid state relay U1, a resistor R11 and a voltage stabilizing diode D3, wherein, The first end of the controller is connected with the first input end of the rectifier bridge D1, The second end of the controller is connected with the second input end of the rectifier bridge D1; The first output end of the rectifier bridge D1 is connected with the first end of the resistor R11, the first end of the auxiliary node, the first end of the permanent magnet mechanism coil and the cathode of the freewheeling diode D12, The second output end of the rectifier bridge D1 and the anode of the voltage stabilizing diode D3, the third end of the drive circuit Drv, and the emitter of the switch tube T1 are connected, The second end of the resistor R11 and the input positive pole of the solid-state relay U1 are connected, The first output end of the solid-state relay U1 and the cathode of the voltage stabilizing diode D3 are connected, The second end of the auxiliary node and the first output end of the solid-state relay U1 are connected, The second output end of the solid-state relay U1 and the first end of the drive circuit Drv are connected, The second end of the permanent magnet mechanism coil and the collector of the switch tube T1 are connected, The anode of the freewheeling diode D12 and the collector of the switch tube T1 are connected, The gate of the switch tube T1 and the second end of the drive circuit Drv are connected.

[0007] As a further description of the above technical solution, the drive circuit Drv further comprises a resistor R1, a voltage stabilizing diode ZD1, a capacitor C1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R8, a PMOS tube Q1, a voltage stabilizing diode ZD2, a PMOS tube Q2, and a functional module U2, wherein, The first end of the drive circuit Drv and the first end of the resistor R1 are connected, The second end of the resistor R1 and the cathode of the voltage stabilizing diode ZD1, the first end of the capacitor C1, the first end of the resistor R2, the first end of the resistor R3, the source of the PMOS tube Q1, and the first end of the functional module U2 are connected, The anode of the voltage stabilizing diode ZD1, the second end of the capacitor C1, the second end of the resistor R2, the second end of the capacitor C2, the second end of the resistor R4, the anode of the voltage stabilizing diode ZD2, the fourth end of the functional module U2, and the third end of the drive circuit Drv are connected, The second end of the resistor R3, the gate of the PMOS tube Q1, and the anode of the diode D2 are connected, The cathode of the diode D2 and the first end of the capacitor C2 and the first end of the resistor R4 are connected, The drain of the PMOS tube Q1 and the first end of the resistor R5 and the source of the PMOS tube Q2 are connected, The second end of the resistor R5, the gate of the PMOS tube Q2, and the cathode of the voltage stabilizing diode ZD2 are connected, The drain of the PMOS tube Q2 and the second end of the functional module U2 are connected, The third end of the functional module U2 is connected with the first end of the resistor R8, The second end of the resistor R8 is connected with the second end of the driving circuit Drv.

[0008] As further description of the above technical solution, the driving circuit Drv further comprises an optical coupler OP1, a capacitor C3, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a PMOS tube Q3, and a PMOS tube Q4. The drain of the PMOS tube Q2 is connected with the first end of the secondary side of the optical coupler OP1, the first end of the resistor R6, and the source of the PMOS tube Q3. The second end of the secondary side of the optical coupler OP1 is connected with the gate of the PMOS tube Q4 and the first end of the resistor R7. The second end of the resistor R6, the gate of the PMOS tube Q3, and the source of the PMOS tube Q4 are connected. The second end of the resistor R7, the drain of the PMOS tube Q4, the second end of the resistor R10, the second end of the capacitor C3, and the third end of the driving circuit Drv are connected. The drain of the PMOS tube Q3 is connected with the second end of the functional module U2. The first end of the resistor R9 is connected with the fourth end of the driving circuit Drv. The second end of the resistor R9 is connected with the first end of the primary side of the optical coupler OP1 and the first end of the capacitor C3. The second end of the primary side of the optical coupler OP1 is connected with the first end of the resistor R10. In addition, the double-coil permanent magnet mechanism control circuit further comprises a sampling resistor Rc, the emitter of the switching tube T1, the fourth end of the driving circuit Drv, and the first end of the sampling resistor Rc are connected, the second output end of the rectifier bridge D1, the third end of the driving circuit Drv, the anode of the voltage stabilizing diode D3, and the second end of the sampling resistor Rc are connected.

[0009] As further description of the above technical solution, the rectifier bridge D1 selects a rectifier bridge GBU2510 with 1000V and 25A.

[0010] As further description of the above technical solution, the switching tube T1 selects a switching tube STGB19NC60KDT4 with 600V and 35A as the switching tube.

[0011] As further description of the above technical solution, the voltage stabilizing diode D3 selects a voltage stabilizing diode SMB5380A with a nominal value of 120V.

[0012] By means of the above technical solution, the present application has the following advantages: The double-coil permanent magnet mechanism control circuit of the present application can replace the capacitor module and the charging module in the original driving device by physical circuit, directly uses AC power as input power, is small in size and convenient to install. Specifically, with the intervention of the driving circuit Drv, the switch tube T1 on the loop where the permanent magnet mechanism coil is located can be controlled under certain conditions, the working preset time is continued after power failure, and the closing to position can be maintained.

[0013] At the same time, the circuit in the present application can realize the functions of under-voltage protection, maximum pulse width limitation, operation interval locking, driving voltage Udmin (minimum value) limitation, maximum output current limitation, etc., which can directly improve the mechanical operation life.

[0014] In order to enable further understanding of the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application, however, the drawings provided are only used for providing reference and description, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present specification, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0016] Figure 1 is a schematic diagram of a double-coil permanent magnet mechanism control circuit provided by the present specification; Figure 2 is a schematic diagram of a driving circuit Drv of a double-coil permanent magnet mechanism control circuit provided by the present specification; Figures 3-4 is a schematic diagram of a maximum output current limitation function of a double-coil permanent magnet mechanism control circuit provided by the present specification. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in the present specification, the technical solutions in the present specification will be described clearly and completely in the following by combining the drawings in the present specification. Obviously, the described embodiments are only some of the embodiments of the present specification, not all. Based on the embodiments in the present specification, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present specification.

[0018] The advantages and effects of the present application can be understood by the skilled in the art from the disclosure of the present specification. The present application can be implemented or applied by other different embodiments, and the details in the present specification can be modified and changed in various ways based on different views and applications without departing from the concept of the present application. In addition, the drawings of the present application are only simple schematic illustrations and not actual size depictions, which is declared in advance. The following embodiments will further illustrate the related technical content of the present application, but the disclosed content is not intended to limit the protection scope of the present application.

[0019] It should be understood that although the terms "first", "second", "third" and the like can be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein can include any one or more combinations of the associated listed items.

[0020] Please refer to Figure 1 The double-coil permanent magnet mechanism control circuit of the present embodiment, wherein the Open / Close Coil is the permanent magnet mechanism coil, the Open / Close switch is the normally open / closed auxiliary node, the Controller is the controller, and the Switch is connected with the Controller through a cable. Figure 1 The right switch is connected with the Controller through a cable.

[0021] The main working principle is that the controller Controller inputs an alternating current 110V power supply, which is converted into direct current after the rectifier bridge D1, and then the auxiliary node Open / Close is added to the drive circuit Drv to control the switch tube T1, and the permanent magnet mechanism coil is powered to set the pulse width to drive the mechanism to perform opening and closing operation. The drive circuit Drv can provide a certain delay control for the switch tube T1 to open even if the auxiliary node is disconnected. The power-on time of the general permanent magnet mechanism coil will not exceed 100ms, and according to the general typical switch driving current of 30A, since the permanent magnet mechanism action is generally instantaneous operation, the rectifier bridge GBU2510 of 1000V 25A is selected for D1, and the switch tube STGB19NC60KDT4 of 600V 35A is selected for the switch tube T1. The maximum instantaneous current of the freewheeling diode D12 is not more than 30A, and the fast recovery diode ES10J with IFSM of 200A is selected. The auxiliary node Open / Close is taken from the normally closed node of the switch.

[0022] Please continue to refer to Figure 1In this embodiment, the under-voltage protection function can be realized by means of the resistor R11, the solid-state relay U1 and the voltage stabilizing diode D3. Specifically, first of all, the input power of the control circuit is determined, and in typical application scenarios, the input power is generally AC 110V. Generally, for a switch, the minimum requirement is that it can perform opening and closing operations when the voltage is above 85% of the rated voltage, that is, the minimum limit voltage Umin=110V*0.85=93.5V. In order to ensure reliable operation at the minimum voltage, the parameters of the voltage stabilizing diode are selected according to 95% of the theoretical value, that is, the final minimum limit voltage is Umin=0.95*93.5V=88.8V. The blocking voltage value is taken after the rectifier bridge, so the voltage stabilizing diode value should be 88.8V*1.414=125.6V, Figure 1 In this embodiment, the voltage stabilizing diode D3 selects a voltage stabilizing diode SMB5380A with a nominal value of 120V. The node voltage of U1 needs to be greater than the peak value of the input voltage 110V*1.414=155V, and a margin is left, Figure 1 In this embodiment, the solid-state relay U1 selects a solid-state relay KAQY214STLD with a withstand voltage of 400V. The under-voltage blocking control loop current is designed to be 5mA, which meets the minimum stable current of the voltage stabilizing diode 1mA and the maximum 39mA, and also meets the minimum opening current of the solid-state relay 3mA. Ignoring the voltage drop of 1.2V after the original side of the solid-state relay is turned on, then the voltage across the resistor R11 is 155V-120V=30V when the rated voltage is input, and the resistor power is 30V*5mA=0.15W. The resistance value is 30V÷5mA=6kΩ. Since there is no such resistance in reality, a 3kΩ resistor is selected for series connection. Figure 1 In this embodiment, the resistor R11 selects two 3k resistors in R1206 package for series connection.

[0023] Please refer to Figure 2 As for the power supply part of the drive circuit Drv, the driving voltage of the switch tube T1 is mainly considered, which is ±20V here. The voltage stabilizing diode ZD1 selects a 18V voltage stabilizing diode 1SMA4746A, and its working current is 14mA~52mA, which is selected to be 30mA here. According to this, the resistance R1=(155V-18V)÷30mA=4.6k, and the closest standard resistance is 4.7kΩ. The power consumption of the resistance is 4.7kΩ*30mA2=4.23W, and 5W is selected to be relatively close. In order to increase reliability, a wire-wound power resistor is selected. The capacitor C1 meets the maximum 200ms of the switch tube T1 opening according to the actual measurement of the 47uF solid-state capacitor. The resistance R2 ensures that the energy consumption of C1 is completed after the operation is completed, and at the same time, it meets the voltage stabilizing diode value of 18V when it is in series with R1. Here, 10kΩ in R0805 package is selected.

[0024] Further, please refer to Figure 2, about the maximum pulse limit part, by the resistance R3 and the charging time constant of capacitor C2, generally RC circuit transition process in 5 times of RC time end, according to the principle of reducing material species, C2 select with C1 consistent 47uF capacitor, R3 select 510 Ω, its time constant is 23.5 ms, transition process time is 117.5 ms, that is, the maximum pulse width will not exceed 117.5 ms.

[0025] About the drive of switch tube T1, since the permanent magnet mechanism belongs to transient operation, the switch tube T1 needs too fast switching speed, the drive resistance R8 is selected as R0805 package 10 Ω, so the maximum drive current is 18V÷10 Ω=1.8A, therefore the gate drive chip of switch tube T1 selects the drive chip UCC27517 with 4A drive capacity. The first end of resistance R8 is connected with function module U2, which is responsible for the current regulation received in front of resistance R8.

[0026] In this embodiment, among PMOS tube Q1, PMOS tube Q2, PMOS tube Q3 and PMOS tube Q4, the maximum drive current 1.8A needs to be met, and the voltage needs to be greater than 18V, here 60V 3A PMOS tube SL03P06A is selected.

[0027] Please refer to Figure 2 , about the operation interval locking function, mainly realized by resistance R4, capacitor C2 and diode D2, when conducting and breaking operation, the capacitor C2 is charged through diode D2 through resistance R2, when the voltage of capacitor C2 is full and reaches the power supply voltage 18V, the GS voltage (gate voltage relative to source voltage) difference of PMOS tube Q1 is 0, and PMOS tube Q1 is closed. The charge in capacitor C2 can only be discharged through resistance R4 due to the existence of diode D2. When the voltage difference between capacitor C2 and the source voltage of PMOS tube Q1 is less than the threshold voltage of PMOS tube Q1, PMOS tube Q1 cannot be turned on. As known from the foregoing, capacitor C2 is 47uF. According to the operation requirements of the switching application, resistance R4 is selected as 1MΩ, realizing operation interval locking of about 47 seconds.

[0028] About the minimum drive voltage of switch tube T1, the gate control voltage of switch tube T1 needs to meet certain requirements, generally about 12V, the minimum drive voltage is set by resistance R5, zener diode ZD2 and PMOS tube Q2 together. Zener diode ZD2 is selected as 12V zener diode BZT52B12, so the voltage across resistance R5 is 6V, meeting the conduction voltage requirement of PMOS tube Q2. The zener diode ZD2 has a zener working current range of 1mA~5mA, which is selected as 3mA here. Therefore, it can be known that the resistance R5 has a resistance value of 6V÷3mA=2kΩ, and the theoretical power consumption of resistance R5 is 6V×3mA=6mW, so 0805 package is selected.

[0029] Please see Figure 3 and Figure 4 Furthermore, the maximum current limiting function is determined by the parameters of the sampling resistor Rc, resistor R9, resistor R10, and optocoupler OP1. When the current flowing through the coil is less than the set value, the primary side of optocoupler OP1 is not conducting. The gate of PMOS transistor Q4 is pulled down by resistor R7, so PMOS transistor Q4 is conducting. Then, the gate of PMOS transistor Q3 is also low, so PMOS transistor Q3 is conducting and can transmit the drive signal normally. When the current flowing through the coil is greater than the set current, the primary side of optocoupler OP1 is conducting, and the gate of PMOS transistor Q4 is high, causing it to be cut off. Then, the gate of PMOS transistor Q3 is pulled up by resistor R6, making PMOS transistor Q3 cut off, thereby blocking the transmission of the drive signal and realizing the maximum current limiting function. The primary-side forward voltage drop of the optocoupler OP1 is generally 1.2V, and the forward current is 2mA. Therefore, the maximum voltage across the sampling resistor Rc is set to 2V. As mentioned above, the maximum coil current is 30A, so the resistance of the sampling resistor Rc is 2V ÷ 30A = 67mΩ. The maximum power consumption of the sampling resistor Rc is 30A × 2V = 60W. Since the sampling resistor is a momentary operating resistor, a 2W resistor is selected. It can withstand a maximum of 300W > 60W under a 100ms pulse. Resistor R9 and capacitor C3 form a low-pass filter circuit to prevent the switching transistor T1 from switching frequently. Resistor R9 is 100Ω. Assuming the switching frequency is not higher than 1kHz, capacitor C1 is 10uF. Resistors R10 and R9 limit the primary-side current of optocoupler OP1. Therefore, resistor R10 = (2V - 1.2V) ÷ 2mA - 100Ω = 300Ω. Resistors R6 and R7 are used as pull-up and pull-down resistors. A 10kΩ 0805 package is sufficient.

[0030] Based on this application, it is possible to eliminate the need for an energy storage capacitor module and a charging module, greatly reducing the size of the drive circuit, which can be directly installed inside the switch; at the same time, this application has a minimum voltage lockout function, a maximum pulse width limiting function, and an operation interval lockout protection mechanism to prevent the coil from burning out; this application also has a maximum output current limiting function, improving the mechanical service life.

[0031] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

[0032] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0033] While the application has been depicted, described, and is defined by reference to particular embodiments, those skilled in the art understand that modifications and variations can be made to the application without departing from the spirit or scope of the application, and it is therefore contemplated to include such modifications and variations as come within the scope of the application.

Claims

1. A control circuit for a dual-coil permanent magnet mechanism, characterized in that, This includes a controller connected to the power supply, a rectifier bridge D1, an auxiliary node, a permanent magnet coil, a freewheeling diode D12, a drive circuit Drv, a switching transistor T1, a solid-state relay U1, a resistor R11, and a Zener diode D3. The first terminal of the controller is connected to the first input terminal of the rectifier bridge D1. The second terminal of the controller is connected to the second input terminal of the rectifier bridge D1; The first output terminal of the rectifier bridge D1 is connected to the first terminal of the resistor R11, the first terminal of the auxiliary node, the first terminal of the permanent magnet mechanism coil, and the cathode of the freewheeling diode D12. The second output terminal of the rectifier bridge D1 is connected to the anode of the Zener diode D3, the third terminal of the driver circuit Drv, and the emitter of the switching transistor T1. The second terminal of the resistor R11 is connected to the positive input terminal of the solid-state relay U1. The first output terminal of the solid-state relay U1 is connected to the cathode of the Zener diode D3. The second end of the auxiliary node is connected to the first output end of the solid-state relay U1. The second output terminal of the solid-state relay U1 is connected to the first terminal of the driving circuit Drv; The second end of the permanent magnet mechanism coil is connected to the collector of the switching transistor T1. The anode of the freewheeling diode D12 is connected to the collector of the switching transistor T1. The gate of the switching transistor T1 is connected to the second terminal of the driving circuit Drv.

2. The control circuit for the dual-coil permanent magnet mechanism according to claim 1, characterized in that: The driving circuit Drv also includes resistor R1, Zener diode ZD1, capacitor C1, resistors R2, R3, R4, R5, and R8, PMOS transistor Q1, Zener diode ZD2, PMOS transistor Q2, and functional module U2, wherein... The first terminal of the driving circuit Drv is connected to the first terminal of the resistor R1. The second terminal of resistor R1 is connected to the cathode of Zener diode ZD1, the first terminal of capacitor C1, the first terminal of resistor R2, the first terminal of resistor R3, the source of PMOS transistor Q1, and the first terminal of functional module U2. The anode of the Zener diode ZD1, the second terminal of the capacitor C1, the second terminal of the resistor R2, the second terminal of the capacitor C2, the second terminal of the resistor R4, the anode of the Zener diode ZD2, the fourth terminal of the functional module U2, and the third terminal of the driving circuit Drv are connected. The second terminal of resistor R3, the gate of PMOS transistor Q1, and the anode of diode D2 are connected. The cathode of the diode D2 is connected to the first terminal of the capacitor C2 and the first terminal of the resistor R4. The drain of the PMOS transistor Q1 is connected to the first terminal of the resistor R5 and the source of the PMOS transistor Q2. The second terminal of the resistor R5, the gate of the PMOS transistor Q2, and the cathode of the Zener diode ZD2 are connected. The drain of the PMOS transistor Q2 is connected to the second terminal of the functional module U2. The third terminal of the functional module U2 is connected to the first terminal of the resistor R8. The second terminal of the resistor R8 is connected to the second terminal of the driving circuit Drv.

3. The control circuit for the dual-coil permanent magnet mechanism according to claim 2, characterized in that: The driving circuit Drv also includes optocoupler OP1, capacitor C3, resistors R6, R7, R9, and R10, PMOS transistor Q3, and PMOS transistor Q4, wherein... The drain of the PMOS transistor Q2 is connected to the first terminal of the secondary side of the optocoupler OP1, the first terminal of the resistor R6, and the source of the PMOS transistor Q3. The second end of the secondary side of the optocoupler OP1 is connected to the gate of the PMOS transistor Q4 and the first end of the resistor R7. The second terminal of resistor R6 is connected to the gate of PMOS transistor Q3 and the source of PMOS transistor Q4. The second terminal of resistor R7, the drain of PMOS transistor Q4, the second terminal of resistor R10, the second terminal of capacitor C3, and the third terminal of the driving circuit Drv are connected. The drain of the PMOS transistor Q3 is connected to the second terminal of the functional module U2; The first terminal of the resistor R9 is connected to the fourth terminal of the driving circuit Drv. The second terminal of resistor R9 is connected to the first terminal of the primary side of optocoupler OP1 and the first terminal of capacitor C3. The second terminal of the primary side of the optocoupler OP1 is connected to the first terminal of the resistor R10. Furthermore, the dual-coil permanent magnet mechanism control circuit also includes a sampling resistor Rc. The emitter of the switching transistor T1, the fourth terminal of the driving circuit Drv, and the first terminal of the sampling resistor Rc are connected. The second output terminal of the rectifier bridge D1, the third terminal of the driving circuit Drv, the anode of the Zener diode D3, and the second terminal of the sampling resistor Rc are connected.

4. The control circuit for the dual-coil permanent magnet mechanism according to claim 3, characterized in that: The rectifier bridge D1 is selected as a 1000V 25A rectifier bridge GBU2510.

5. The control circuit for the dual-coil permanent magnet mechanism according to claim 4, characterized in that: The switching transistor T1 is selected as a 600V 35A switching transistor STGB19NC60KDT4.

6. The control circuit for the dual-coil permanent magnet mechanism according to claim 5, characterized in that: The Zener diode D3 is selected as SMB5380A, with a nominal value of 120V.

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