Control circuit and control method of bistable permanent magnetic mechanism
By designing a simple control circuit composed of switches and diodes, the positive and negative current of the bistable permanent magnet mechanism can be adjusted at any time, solving the problem of load-bearing breakage and reducing cost and complexity.
Patent Information
- Application Number
- CN202311160056.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-08
- Publication Date
- 2025-03-11
AI Technical Summary
The prior art is difficult to achieve any adjustment of positive and negative coil current of bistable permanent magnet mechanism at any time, and there is a problem of load-bearing breakage, which increases cost and complexity.
A control circuit is designed to provide forward or reverse current to the coil through simple operation of several switches and diodes, and to disconnect one switch first when power is stopped, and then the remaining switches are disconnected, avoiding load breakage.
The coil current is adjustable at any time with positive and negative, which reduces the complexity and cost of the control circuit, and is adapted to different bistable permanent magnet mechanisms.
Smart Images
Figure CN119596734A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of control, and more specifically, to a control circuit and a control method of a bistable permanent magnet mechanism. Background Art
[0002] The bistable permanent magnet mechanism is an operating mechanism that is electromagnetically driven and permanently held rather than electrically held. For the bistable permanent magnet mechanism, when the coil is energized, the coil with current flowing through it generates a magnetic field, which can make the moving iron core move quickly from, for example, position A to position B (i.e., closing operation). After reaching position B, the coil does not need to be continuously powered, and the magnetic field force generated by the permanent magnet can keep the moving iron core at position B. If the moving iron core is to be restored from, for example, position B to position A (i.e., opening operation), it is necessary to pass a current in the opposite direction through the coil to generate a reverse magnetic field, thereby restoring the moving iron core from position B to position A.
[0003] Therefore, a control circuit is needed to adjust the positive and negative current passing through the coil at any time. Summary of the invention
[0004] In view of the above problems, the present disclosure provides a control circuit for a bistable permanent magnet mechanism. Since the control circuit provided by the present disclosure can provide a forward current or a reverse current to the coil by simply operating a few switches and diodes, and when stopping providing the forward current or the reverse current to the coil, one switch is disconnected first and then the remaining switches are disconnected, so that the control circuit provided by the present disclosure does not require a complex drive circuit design, and can achieve the adjustment of the positive and negative current passing through the coil at any time and avoid on-load disconnection, thereby reducing costs.
[0005] The embodiment of the present disclosure provides a control circuit of a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism includes a coil, and the control circuit includes: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein the first end of the first switch, the first end of the third switch and the cathode of the diode are all connected to the power supply, the second end of the first switch is connected to the first end of the coil, the second end of the third switch is connected to the second end of the coil, the first end of the second switch is connected to the first end of the coil, the first end of the fourth switch is connected to the second end of the coil, the second end of the second switch, the second end of the fourth switch and the anode of the diode are connected to the first end of the fifth switch, and the second end of the fifth switch is grounded; a control unit is used to control the first and second ends of the first and third switches. The first switch, the second switch, the third switch, the fourth switch, and the fifth switch are turned on and off, wherein the control unit controls the first switch, the fourth switch, and the fifth switch to be turned on and the third switch and the second switch to be turned off, so as to provide a forward current to the coil, and when it is necessary to stop providing the forward current to the coil, the control unit controls the fifth switch to be turned off and then controls the first switch and the fourth switch to be turned off; the control unit controls the third switch, the second switch, and the fifth switch to be turned on and the first switch and the fourth switch to be turned off, so as to provide a reverse current to the coil, and when it is necessary to stop providing the reverse current to the coil, the control unit controls the fifth switch to be turned off and then controls the third switch and the second switch to be turned off.
[0006] According to an embodiment of the present disclosure, the control unit is further configured to control the fifth switch to operate based on a pulse width modulation wave.
[0007] According to an embodiment of the present disclosure, the fifth switch is an electronic switch, and a control end of the electronic switch is connected to the control unit.
[0008] According to an embodiment of the present disclosure, the first switch, the second switch, the third switch and the fourth switch are all mechanical switches.
[0009] According to an embodiment of the present disclosure, the fifth switch is a mechanical switch.
[0010] The embodiment of the present disclosure provides a control method for a control circuit of a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism includes a coil, and the control circuit includes: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein the first end of the first switch, the first end of the third switch and the cathode of the diode are all connected to the power supply, the second end of the first switch is connected to the first end of the coil, the second end of the third switch is connected to the second end of the coil, the first end of the second switch is connected to the first end of the coil, the first end of the fourth switch is connected to the second end of the coil, the second end of the second switch, the second end of the fourth switch and the anode of the diode are connected to the first end of the fifth switch, and the second end of the fifth switch is grounded; a control unit is used to control the The first switch, the second switch, the third switch, the fourth switch and the fifth switch are turned on and off; the control method includes: controlling the first switch, the fourth switch and the fifth switch to be turned on and the third switch and the second switch to be turned off by the control unit to provide a forward current to the coil, and, when it is necessary to stop providing the forward current to the coil, controlling the fifth switch to be turned off by the control unit and then controlling the first switch and the fourth switch to be turned off; controlling the third switch, the second switch and the fifth switch to be turned on and the first switch and the fourth switch to be turned off by the control unit to provide a reverse current to the coil, and, when it is necessary to stop providing the reverse current to the coil, controlling the fifth switch to be turned off by the control unit and then controlling the third switch and the second switch to be turned off.
[0011] According to an embodiment of the present disclosure, the control unit is further used to control the fifth switch to operate based on a pulse width modulation wave; wherein the control method also includes controlling the fifth switch to operate based on a pulse width modulation wave through the control unit.
[0012] According to an embodiment of the present disclosure, the fifth switch is an electronic switch, and a control end of the electronic switch is connected to the control unit.
[0013] According to an embodiment of the present disclosure, the first switch, the second switch, the third switch and the fourth switch are all mechanical switches.
[0014] According to an embodiment of the present disclosure, the fifth switch is a mechanical switch.
[0015] The present disclosure provides a control circuit and a control method for a bistable permanent magnet mechanism. The control circuit provided by the present disclosure can provide a forward current or a reverse current to the coil by simply operating a few switches and diodes, and when stopping providing the forward current or the reverse current to the coil, it first disconnects one switch and then disconnects the remaining switches, so that the control circuit provided by the present disclosure does not require a complex drive circuit design, and can achieve the positive and negative current through the coil to be adjustable at any time and avoid load disconnection, thereby reducing costs. In addition, the control circuit of the present disclosure can control the fifth switch to operate based on a pulse width modulation wave, so that the control circuit provided by the present disclosure can realize PWM control, so that it can adapt to a larger working current range, and then can adapt to different bistable permanent magnet mechanisms, and has a wide range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure, and a person of ordinary skill in the art can obtain other drawings based on these drawings without creative work.
[0017] Figure 1A A schematic diagram of a control circuit 130 of a bistable permanent magnet mechanism according to an embodiment of the present disclosure is shown;
[0018] Figure 1B A schematic diagram of a control circuit 130 for providing a forward current according to an embodiment of the present disclosure is shown;
[0019] Figure 1C A schematic diagram showing a circuit after the fifth switch is disconnected according to an embodiment of the present disclosure;
[0020] Figure 1D A schematic diagram of a control circuit 130 for providing reverse current according to an embodiment of the present disclosure is shown;
[0021] Figure 1E A schematic diagram showing a circuit after the fifth switch is disconnected according to an embodiment of the present disclosure;
[0022] Figure 1F FIG. 1 shows a schematic diagram of a control circuit 130 in a case where the fifth switch is an electronic switch according to an embodiment of the present disclosure;
[0023] Figure 2 A flow chart of a control method 200 for a control circuit of a bistable permanent magnet mechanism according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.
[0025] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0026] In the prior art, a control circuit is needed to make the positive and negative current passing through the coil adjustable at any time. There are two main implementation methods at present. One implementation method is to form a bridge circuit through four metal-oxide semiconductor field-effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), so as to realize the control of the positive and negative direction of the current passing through the coil. However, this method not only has a relatively complex circuit, but also has difficulty in realizing pulse width modulation (Pulse Width Modulation, PWM) control. Another implementation method is to realize the control of the positive and negative direction of the current passing through the coil by a bidirectional switching circuit composed of two relays. However, this method also has a relatively complex circuit, and a relay is also required to realize load disconnection, which has high requirements on the silver thickness of the relay contacts and increases the cost. In addition, due to the slow action speed of the relay, PWM control cannot be realized.
[0027] In order to solve the above problems, the present disclosure provides a control circuit for a bistable permanent magnet mechanism. Since the control circuit provided by the present disclosure can provide a forward current or a reverse current to the coil by simply operating a few switches and diodes, and when stopping providing the forward current or the reverse current to the coil, one switch is disconnected first and then the remaining switches are disconnected, so that the control circuit provided by the present disclosure does not require a complex drive circuit design, and can achieve the adjustment of the positive and negative current passing through the coil at any time and avoid on-load disconnection, thereby reducing costs.
[0028] The above control circuit provided by the present disclosure will be described in detail below with reference to the accompanying drawings.
[0029] Figure 1A FIG. 1 is a schematic diagram of a control circuit 130 of a bistable permanent magnet mechanism according to an embodiment of the present disclosure.
[0030] Reference Figure 1A , the control circuit 130 may include a first switch T1 , a second switch T2 , a third switch T3 , a fourth switch T4 , a fifth switch T5 and a diode D1 .
[0031] According to an embodiment of the present disclosure, the first end 1 of the first switch T1, the first end 1 of the third switch T3, and the cathode of the diode D1 may all be connected to the power supply 110, wherein the power supply 110 may be any suitable external power supply, such as a DC power supply or a rectified DC source. The second end 2 of the first switch T1 may be connected to the first end 1 of the coil 120, wherein the coil 120 may be a coil of the bistable permanent magnet mechanism as described above. The second end 2 of the third switch T3 may be connected to the second end 2 of the coil 120. The first end 1 of the second switch T2 may be connected to the first end 1 of the coil 120. The first end 1 of the fourth switch T4 may be connected to the second end 2 of the coil 120. The second end 2 of the second switch T2, the second end 2 of the fourth switch T4, and the anode of the diode D1 may be connected to the first end 1 of the fifth switch T5. The second end 2 of the fifth switch T5 may be grounded.
[0032] According to the embodiment of the present disclosure, the first switch T1, the second switch T2, the third switch T3, the fourth switch T4 and the fifth switch T5 can be the same or different types of mechanical switches selected according to actual needs, such as a double-pole double-throw switch or a single-pole single-throw switch.
[0033] According to an embodiment of the present disclosure, the control circuit 130 may include a control unit for controlling the on and off of the first switch T1 , the second switch T2 , the third switch T3 , the fourth switch T4 , and the fifth switch T5 .
[0034] As an example, the control unit may control the first switch T1, the fourth switch T4, and the fifth switch T5 to be turned on and the third switch T3 and the second switch T2 to be turned off, so as to provide a forward current to the coil. For example, the control unit may first control the first switch T1 and the fourth switch T4 to be turned on, the third switch T3 and the second switch T2 to be turned off, and then control the fifth switch T5 to be turned on. It should be noted that the turn-on sequence of the above switches is only an example, and the above switches may also be turned on in other sequences or simultaneously.
[0035] At this time, if Figure 1B As shown, the power supply 110, the first switch T1, the coil 120, the fourth switch T4 and the fifth switch T5 form a loop (such as Figure 1B ), thereby providing, for example, a positive current to the coil 120. In this case, as described above, the coil with the positive current can generate a magnetic field, thereby causing the moving iron core to quickly move from position A to position B, thereby achieving a closing operation.
[0036] When it is necessary to stop providing the forward current to the coil 120, the control unit may control the fifth switch T5 to be turned off and then control the first switch T1 and the fourth switch T4 to be turned off. Figure 1C As shown, the control unit may first control the fifth switch T5 to be turned off, and then after a predetermined time interval (which may be a predetermined value determined in advance, such as N nanoseconds, where N is a positive integer) or after detecting that the loop composed of the first switch T1, the coil 120, the fourth switch T4 and the diode D1 (such as Figure 1C After there is no current in the circuit (as indicated by the black thick arrow in FIG), the first switch T1 and the fourth switch T4 are controlled to be disconnected. As an example, any suitable existing method can be used to detect whether there is still current in the circuit.
[0037] Since the first switch T1 and the fourth switch T4 are not disconnected immediately after the fifth switch T5 is disconnected, the current flowing through the first switch T1, the coil 120, the fourth switch T4 and the diode D1 can be consumed through the loop composed of the first switch T1, the coil 120, the fourth switch T4 and the diode D1 after the fifth switch T5 is disconnected. After the current is consumed, the control unit controls the first switch T1 and the fourth switch T4 to be disconnected, thereby avoiding the problem of load disconnection of the first switch T1 and the fourth switch T4. In addition, after the current is consumed, no current passes through the coil. At this time, as described in the background technology, the magnetic field force generated by the permanent magnet can be used to keep the moving iron core at position B.
[0038] As an example, the control unit may control the third switch T3, the second switch T2, and the fifth switch T5 to be turned on and the first switch T1 and the fourth switch T4 to be turned off, so as to provide a reverse current to the coil. For example, the control unit may first control the third switch T3 and the second switch T2 to be turned on, the first switch T1 and the fourth switch T4 to be turned off, and then control the fifth switch T5 to be turned on. It should be noted that the turn-on sequence of the above switches is only an example, and the above switches may also be turned on in other sequences or simultaneously.
[0039] At this time, if Figure 1D As shown, the power supply, the third switch T3, the coil 120, the second switch T2 and the fifth switch T5 form a loop (as shown in FIG. Figure 1D ), thereby providing, for example, a reverse current to the coil 120. In this case, as described above, the coil with the reverse current can generate a magnetic field, so that the moving iron core quickly returns to the A position from the B position, thereby realizing the opening operation.
[0040] When it is necessary to stop providing the reverse current to the coil 120, the control unit controls the fifth switch T5 to be turned off and then controls the third switch T3 and the second switch T2 to be turned off. Figure 1D As shown, the control unit may first control the fifth switch T5 to be turned off, and then after a predetermined time interval (which may be a predetermined value determined in advance, such as M nanoseconds, where M is a positive integer, wherein the value of M and the value of N may be the same or different according to the actual scenario) or after detecting that the loop composed of the third switch T3, the coil 120, the second switch T2 and the diode D1 (such as Figure 1E After there is no current in the circuit (as shown by the black thick arrow in FIG), the third switch T3 and the second switch T2 are controlled to be disconnected. As an example, any suitable existing method can be used to detect whether there is still current in the above loop.
[0041] Since the third switch T3 and the second switch T2 are not disconnected immediately after the fifth switch T5 is disconnected, the current flowing through the third switch T3, the coil 120, the second switch T2 and the diode D1 can be consumed through the loop composed of the third switch T3, the coil 120, the second switch T2 and the diode D1 after the fifth switch T5 is disconnected. After the current is consumed, the control unit controls the third switch T3 and the second switch T2 to be disconnected, thereby avoiding the problem of load disconnection of the third switch T3 and the second switch T2. In addition, after the current is consumed, no current passes through the coil. At this time, as described in the background technology, the magnetic field force generated by the permanent magnet can be used to keep the moving iron core at position A.
[0042] According to an embodiment of the present disclosure, the control unit may also be used to control the fifth switch T5 to operate based on a pulse width modulation wave. For example, at this time, the fifth switch T5 may be an electronic switch, such as an electronic switch implemented based on a thyristor (such as a thyristor (Silicon Controlled Rectifier, SCR)), a MOSFET, an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor), etc. The control end of the electronic switch may be connected to the control unit.
[0043] As an example, in the case where the fifth switch T5 is an electronic switch implemented based on MOSFET, the schematic diagram of the control circuit 130 may be as follows: Figure 1F shown.
[0044] like Figure 1F As shown, the first end 1 of the fifth switch T5 may be the drain of the MOSFET, the second end 2 of the fifth switch T5 may be the source of the MOSFET, and the gate (ie, the control end) of the MOSFET may be connected to the control unit 140. Figure 1F The driving unit 150 shown by the dashed line can be used to drive the fifth switch T5 to operate based on the PWM wave output by the control unit 140. The driving unit 150 is an optional unit, and the driving unit 150 can be integrated in the control unit 140. In addition, for simplicity and clarity, Figure 1F Only the control unit 140 is shown to be connected to the fifth switch T5, thereby controlling the fifth switch T5; however, as mentioned above, the control unit 150 can be connected to the above-mentioned first switch T1, second switch T2, third switch T3 and fourth switch T4 respectively, thereby controlling the conduction and disconnection of the first switch T1, second switch T2, third switch T3 and fourth switch T4.
[0045] The control unit 140 can output a PWM wave with a predetermined duty cycle, so that the fifth switch T5 operated based on the PWM wave with the predetermined duty cycle and the loop composed of the above switch and coil have a current size corresponding thereto, so that the control circuit provided by the present disclosure can adapt to different bistable permanent magnet mechanisms. For example, when the coil in the bistable permanent magnet mechanism requires a current of 1A, the control unit 140 can output a PWM wave with a duty cycle corresponding to the current of 1A, so that after the control unit 140 outputs the PWM wave with the duty cycle, the fifth switch T5 operated based on the PWM wave with the duty cycle and the loop composed of the above switch and coil have a current size of 1A. For another example, when the coil in the bistable permanent magnet mechanism requires a current of 5A, the control unit 140 can output a PWM wave with a duty cycle corresponding to the current of 5A, so that after the control unit 140 outputs the PWM wave with the duty cycle, the fifth switch T5 operated based on the PWM wave with the duty cycle and the loop composed of the above switch and coil have a current size of 5A.
[0046] It can be seen from the above content that the control circuit provided by the present disclosure can realize PWM control, so that it can adapt to a larger operating current range, and further can adapt to different bistable permanent magnet mechanisms, and has a wide range of application scenarios.
[0047] In addition, if Figure 1F As shown, the control unit 140 can also output a wave of a constant level. At this time, the fifth switch T5 can be turned on or off, similar to the case where the fifth switch is a mechanical switch, which will not be described in detail here.
[0048] The above has been referred to Figures 1A to 1F The control circuit of the bistable permanent magnet mechanism according to the embodiment of the present disclosure is described. According to the control circuit of the embodiment of the present disclosure, a forward current or a reverse current can be provided to the coil by simply operating a few switches and diodes, and when stopping providing the forward current or the reverse current to the coil, one switch is disconnected first and then the remaining switches are disconnected, so that the control circuit provided by the present disclosure does not require a complex drive circuit design, and can achieve the positive and negative current passing through the coil to be adjustable at any time and avoid load disconnection, thereby reducing costs. In addition, the control circuit of the present disclosure can control the fifth switch to operate based on a pulse width modulation wave, so that the control circuit provided by the present disclosure can realize PWM control, so that it can adapt to a larger working current range, and then can adapt to different bistable permanent magnet mechanisms, and has a wide range of application scenarios.
[0049] In addition to providing the control circuit of the bistable permanent magnet mechanism, the present disclosure also provides a control method for the control circuit of the bistable permanent magnet mechanism. Figure 2 This is explained.
[0050] Figure 2 The flowchart of the control method 200 for the control circuit of the bistable permanent magnet mechanism according to the embodiment of the present disclosure is shown. The above description of the control circuit of the bistable permanent magnet mechanism is also applicable to the method 200, unless otherwise explicitly stated.
[0051] According to an embodiment of the present disclosure, the bistable permanent magnet mechanism may include a coil. The control circuit may include: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein the first end of the first switch, the first end of the third switch and the cathode of the diode are all connected to the power supply, the second end of the first switch is connected to the first end of the coil, the second end of the third switch is connected to the second end of the coil, the first end of the second switch is connected to the first end of the coil, the first end of the fourth switch is connected to the second end of the coil, the second end of the second switch, the second end of the fourth switch and the anode of the diode are connected to the first end of the fifth switch, and the second end of the fifth switch is grounded; a control unit is used to control the conduction and disconnection of the first switch, the second switch, the third switch, the fourth switch and the fifth switch.
[0052] As an example, as mentioned above Figure 1A , the control circuit 130 may include a first switch T1, a second switch T2, a third switch T3, a fourth switch T4, a fifth switch T5 and a diode D1. The first end 1 of the first switch T1, the first end 1 of the third switch T3 and the cathode of the diode D1 may all be connected to the power supply 110, wherein the power supply 110 may be any suitable external power supply, such as a DC power supply or a rectified DC source. The second end 2 of the first switch T1 may be connected to the first end 1 of the coil 120, wherein the coil 120 may be a coil of the bistable permanent magnet mechanism as described above. The second end 2 of the third switch T3 may be connected to the second end 2 of the coil 120. The first end 1 of the second switch T2 may be connected to the first end 1 of the coil 120. The first end 1 of the fourth switch T4 may be connected to the second end 2 of the coil 120. The second end 2 of the second switch T2, the second end 2 of the fourth switch T4 and the anode of the diode D1 may be connected to the first end 1 of the fifth switch T5. The second end 2 of the fifth switch T5 may be grounded.
[0053] According to the embodiment of the present disclosure, the first switch T1, the second switch T2, the third switch T3, the fourth switch T4 and the fifth switch T5 can be the same or different types of mechanical switches selected according to actual needs, such as a double-pole double-throw switch or a single-pole single-throw switch.
[0054] According to an embodiment of the present disclosure, the control circuit 130 may include a control unit for controlling the on and off of the first switch T1 , the second switch T2 , the third switch T3 , the fourth switch T4 , and the fifth switch T5 .
[0055] Reference Figure 2 In step S210, the control unit can control the first switch T1, the fourth switch T4 and the fifth switch T5 to be turned on and the third switch T3 and the second switch T2 to be turned off to provide a forward current to the coil, and when it is necessary to stop providing the forward current to the coil, the control unit controls the fifth switch to be turned off and then controls the first switch and the fourth switch to be turned off.
[0056] For example, the control unit may first control the first switch T1 and the fourth switch T4 to be turned on, the third switch T3 and the second switch T2 to be turned off, and then control the fifth switch T5 to be turned on. It should be noted that the turn-on sequence of the above switches is only an example, and the above switches may also be turned on in other sequences or simultaneously. Figure 1B As shown, the power supply 110, the first switch T1, the coil 120, the fourth switch T4 and the fifth switch T5 form a loop (such as Figure 1B ), thereby providing, for example, a positive current to the coil 120. In this case, as described above, the coil with the positive current can generate a magnetic field, thereby causing the moving iron core to quickly move from position A to position B, thereby achieving a closing operation.
[0057] When it is necessary to stop providing the forward current to the coil 120, the control unit may control the fifth switch T5 to be turned off and then control the first switch T1 and the fourth switch T4 to be turned off. Figure 1C As shown, the control unit may first control the fifth switch T5 to be turned off, and then after a predetermined time interval (which may be a predetermined value determined in advance, such as N nanoseconds, where N is a positive integer) or after detecting that the loop composed of the first switch T1, the coil 120, the fourth switch T4 and the diode D1 (such as Figure 1C After there is no current in the circuit (as indicated by the black thick arrow in FIG), the first switch T1 and the fourth switch T4 are controlled to be disconnected. As an example, any suitable existing method can be used to detect whether there is still current in the circuit.
[0058] Since the first switch T1 and the fourth switch T4 are not disconnected immediately after the fifth switch T5 is disconnected, the current flowing through the first switch T1, the coil 120, the fourth switch T4 and the diode D1 can be consumed through the loop composed of the first switch T1, the coil 120, the fourth switch T4 and the diode D1 after the fifth switch T5 is disconnected. After the current is consumed, the control unit controls the first switch T1 and the fourth switch T4 to be disconnected, thereby avoiding the problem of load disconnection of the first switch T1 and the fourth switch T4. In addition, after the current is consumed, no current passes through the coil. At this time, as described in the background technology, the magnetic field force generated by the permanent magnet can be used to keep the moving iron core at position B.
[0059] Continue to refer to Figure 2 In step S220, the control unit can control the third switch T3, the second switch T2 and the fifth switch T5 to be turned on and the first switch T1 and the fourth switch T4 to be turned off to provide a reverse current to the coil, and when it is necessary to stop providing the reverse current to the coil, the control unit controls the fifth switch to be turned off and then controls the third switch and the second switch to be turned off.
[0060] For example, the control unit may first control the third switch T3 and the second switch T2 to be turned on, the first switch T1 and the fourth switch T4 to be turned off, and then control the fifth switch T5 to be turned on. It should be noted that the above switch turn-on sequence is only an example, and the above switches may also be turned on in other sequences or simultaneously.
[0061] At this time, if Figure 1D As shown, the power supply, the third switch T3, the coil 120, the second switch T2 and the fifth switch T5 form a loop (as shown in FIG. Figure 1D ), thereby providing, for example, a reverse current to the coil 120. In this case, as described above, the coil with the reverse current can generate a magnetic field, so that the moving iron core quickly returns to the A position from the B position, thereby realizing the opening operation.
[0062] When it is necessary to stop providing the reverse current to the coil 120, the control unit controls the fifth switch T5 to be turned off and then controls the third switch T3 and the second switch T2 to be turned off. Figure 1D As shown, the control unit may first control the fifth switch T5 to be turned off, and then after a predetermined time interval (which may be a predetermined value determined in advance, such as M nanoseconds, where M is a positive integer, wherein the value of M and the value of N may be the same or different according to the actual scenario) or after detecting that the loop composed of the third switch T3, the coil 120, the second switch T2 and the diode D1 (such as Figure 1EAfter there is no current in the circuit (as shown by the black thick arrow in FIG), the third switch T3 and the second switch T2 are controlled to be disconnected. As an example, any suitable existing method can be used to detect whether there is still current in the above loop.
[0063] Since the third switch T3 and the second switch T2 are not disconnected immediately after the fifth switch T5 is disconnected, the current flowing through the third switch T3, the coil 120, the second switch T2 and the diode D1 can be consumed through the loop composed of the third switch T3, the coil 120, the second switch T2 and the diode D1 after the fifth switch T5 is disconnected. After the current is consumed, the control unit controls the third switch T3 and the second switch T2 to be disconnected, thereby avoiding the problem of load disconnection of the third switch T3 and the second switch T2. In addition, after the current is consumed, no current passes through the coil. At this time, as described in the background technology, the magnetic field force generated by the permanent magnet can be used to keep the moving iron core at position A.
[0064] According to an embodiment of the present disclosure, the control unit may also be used to control the fifth switch T5 to operate based on a pulse width modulation wave. For example, at this time, the fifth switch T5 may be an electronic switch, such as an electronic switch implemented based on a thyristor (such as an SCR), a MOSFET, an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor), etc. The control end of the electronic switch may be connected to the control unit. In this case, the method 200 may also include controlling the fifth switch to operate based on a pulse width modulation wave by the control unit.
[0065] As an example, in the case where the fifth switch T5 is an electronic switch implemented based on MOSFET, the schematic diagram of the control circuit 130 may be as follows: Figure 1F shown.
[0066] like Figure 1F As shown, the first end 1 of the fifth switch T5 may be the drain of the MOSFET, the second end 2 of the fifth switch T5 may be the source of the MOSFET, and the gate (ie, the control end) of the MOSFET may be connected to the control unit 140. Figure 1F The driving unit 150 shown by the dashed line can be used to drive the fifth switch T5 to operate based on the PWM wave output by the control unit 140. The driving unit 150 is an optional unit, and the driving unit 150 can be integrated in the control unit 140. In addition, for simplicity and clarity, Figure 1FOnly the control unit 140 is shown to be connected to the fifth switch T5, thereby controlling the fifth switch T5; however, as mentioned above, the control unit 150 can be connected to the above-mentioned first switch T1, second switch T2, third switch T3 and fourth switch T4 respectively, thereby controlling the conduction and disconnection of the first switch T1, second switch T2, third switch T3 and fourth switch T4.
[0067] The method 200 can output a PWM wave with a predetermined duty cycle through the control unit 140, so that the fifth switch T5 operated based on the PWM wave with the predetermined duty cycle and the loop composed of the above switch and the coil have a current size corresponding thereto, so that the control method provided by the present disclosure can be adapted to different bistable permanent magnet mechanisms. For example, when the coil in the bistable permanent magnet mechanism requires a current of 1A, the method 200 can output a PWM wave with a duty cycle corresponding to the current of 1A through the control unit 140, so that after the control unit 140 outputs the PWM wave with the duty cycle, the fifth switch T5 operated based on the PWM wave with the duty cycle and the loop composed of the above switch and the coil have a current size of 1A. For another example, when the coil in the bistable permanent magnet mechanism requires a current of 5A, the method 200 can output a PWM wave with a duty cycle corresponding to the current of 5A through the control unit 140, so that after the control unit 140 outputs the PWM wave with the duty cycle, the fifth switch T5 operated based on the PWM wave with the duty cycle and the loop composed of the above-mentioned switch and the coil have a current of 5A.
[0068] It can be seen from the above content that the control circuit provided by the present disclosure can realize PWM control, so that it can adapt to a larger operating current range, and further can adapt to different bistable permanent magnet mechanisms, and has a wide range of application scenarios.
[0069] In addition, if Figure 1F As shown, the method 200 can also output a wave of a constant level through the control unit 140. At this time, the fifth switch T5 can be turned on or off, similar to the case where the fifth switch is a mechanical switch, which will not be described in detail here.
[0070] In addition, it should be noted that there is no necessary execution order for the above steps S210 and S220. Depending on the actual application scenario, only one of the above steps S210 and S220 may be executed, or step S220 may be executed first and then step S210, or step S210 may be executed first and then step S220.
[0071] The above has been referred to Figure 1A to Figure 2The control circuit and control method of the bistable permanent magnet mechanism according to the embodiment of the present disclosure are described. According to the control circuit and control method of the embodiment of the present disclosure, a forward current or a reverse current can be provided to the coil by simply operating a few switches and diodes, and when stopping providing the forward current or the reverse current to the coil, one switch is disconnected first and then the remaining switches are disconnected, so that the control circuit provided by the present disclosure does not require a complex drive circuit design and the control method provided by the present disclosure does not require a complex logic design, and the positive and negative currents passing through the coil can be adjusted at any time and load disconnection can be avoided, thereby reducing costs. In addition, the control circuit and control method of the present disclosure can control the fifth switch to operate based on a pulse width modulation wave, so that the control circuit and control method provided by the present disclosure can realize PWM control, so that a larger working current range can be adapted, and then different bistable permanent magnet mechanisms can be adapted, and have a wide range of application scenarios.
[0072] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the control circuit and control method according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, the program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.
[0073] In general, various example embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, firmware, logic, or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device. When various aspects of the embodiments of the present disclosure are illustrated or described as block diagrams, flow charts, or using some other graphical representation, it will be understood that the blocks, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof as non-limiting examples.
[0074] The exemplary embodiments of the present invention described in detail above are merely illustrative, rather than restrictive. It should be understood by those skilled in the art that various modifications and combinations may be made to these embodiments or their features without departing from the principles and spirit of the present invention, and such modifications should fall within the scope of the present invention.
[0075] In the above specific embodiments, it can be seen that different features are combined together in the examples. This disclosure should not be understood as an intention that the example clauses have more features than the features explicitly mentioned in each clause. On the contrary, various aspects of the present disclosure may include fewer features than all the features of the disclosed single example clauses. Therefore, the following clauses should be considered to be included in the specification, where each clause itself can be used as a separate example. Although each subordinate clause in these clauses can refer to a specific combination with one of the other clauses, the aspects of the subordinate clauses are not limited to specific combinations. It should be understood that other example clauses may also include a combination of the subject matter of the subordinate clauses with any other subordinate clauses or independent clauses, or any combination of features with other subordinate clauses and independent clauses. Various aspects disclosed herein explicitly include these combinations, unless it is explicitly expressed or it can be easily inferred that a specific combination is not intended (for example, contradictory aspects, such as defining an element as both an insulator and a conductor). In addition, it is also intended that various aspects of the clauses may also be included in any other independent clauses, even if the clause is not directly subordinate to the independent clause.
[0076] The following numbered clauses describe implementation examples:
[0077] Clause 1. A control circuit for a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism includes a coil, and the control circuit includes: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein the first end of the first switch, the first end of the third switch and the cathode of the diode are all connected to the power supply, the second end of the first switch is connected to the first end of the coil, the second end of the third switch is connected to the second end of the coil, the first end of the second switch is connected to the first end of the coil, the first end of the fourth switch is connected to the second end of the coil, the second end of the second switch, the second end of the fourth switch and the anode of the diode are connected to the first end of the fifth switch, and the second end of the fifth switch is grounded; a control unit for controlling the first switch The control unit controls the first switch, the fourth switch and the fifth switch to be turned on and off, wherein the control unit controls the first switch, the fourth switch and the fifth switch to be turned on and the third switch and the second switch to be turned off, so as to provide a forward current to the coil, and when it is necessary to stop providing the forward current to the coil, the control unit controls the fifth switch to be turned off and then controls the first switch and the fourth switch to be turned off; the control unit controls the third switch, the second switch and the fifth switch to be turned on and the first switch and the fourth switch to be turned off, so as to provide a reverse current to the coil, and when it is necessary to stop providing the reverse current to the coil, the control unit controls the fifth switch to be turned off and then controls the third switch and the second switch to be turned off.
[0078] Clause 2. The control circuit according to clause 1, wherein the control unit is further configured to control the fifth switch to operate based on a pulse width modulation wave.
[0079] Clause 3. The control circuit according to clause 1 or 2, wherein the fifth switch is an electronic switch, and a control terminal of the electronic switch is connected to the control unit.
[0080] Clause 4. The control circuit of any of clauses 1-3, wherein the first switch, the second switch, the third switch, and the fourth switch are mechanical switches.
[0081] Clause 5. The control circuit of clause 1, wherein the fifth switch is a mechanical switch.
[0082] Clause 6. A control method for a control circuit of a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism includes a coil, and the control circuit includes: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein the first end of the first switch, the first end of the third switch and the cathode of the diode are all connected to the power supply, the second end of the first switch is connected to the first end of the coil, the second end of the third switch is connected to the second end of the coil, the first end of the second switch is connected to the first end of the coil, the first end of the fourth switch is connected to the second end of the coil, the second end of the second switch, the second end of the fourth switch and the anode of the diode are connected to the first end of the fifth switch, and the second end of the fifth switch is grounded; a control unit for controlling the first switch The control method comprises: controlling the first switch, the fourth switch and the fifth switch to be turned on and the third switch and the second switch to be turned off by the control unit to provide a forward current to the coil, and, when it is necessary to stop providing the forward current to the coil, controlling the fifth switch to be turned off by the control unit and then controlling the first switch and the fourth switch to be turned off; controlling the third switch, the second switch and the fifth switch to be turned on and the first switch and the fourth switch to be turned off by the control unit to provide a reverse current to the coil, and, when it is necessary to stop providing the reverse current to the coil, controlling the fifth switch to be turned off by the control unit and then controlling the third switch and the second switch to be turned off.
[0083] Clause 7. The control method according to Clause 6, wherein the control unit is further used to control the fifth switch to operate based on a pulse width modulation wave; wherein the control method also includes controlling the fifth switch to operate based on a pulse width modulation wave through the control unit.
[0084] Clause 8. The control method according to clause 6 or 7, wherein the fifth switch is an electronic switch, and a control end of the electronic switch is connected to the control unit.
[0085] Clause 9. The control method according to any one of clauses 6-8, wherein the first switch, the second switch, the third switch and the fourth switch are all mechanical switches.
[0086] Clause 10. The control method according to Clause 6, wherein the fifth switch is a mechanical switch.
Claims
1. A control circuit for a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism comprises a coil, and the control circuit comprises: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein a first end of the first switch, a first end of the third switch and a cathode of the diode are all connected to the power supply, a second end of the first switch is connected to a first end of the coil, a second end of the third switch is connected to a second end of the coil, a first end of the second switch is connected to a first end of the coil, a first end of the fourth switch is connected to a second end of the coil, a second end of the second switch, a second end of the fourth switch and an anode of the diode are connected to a first end of the fifth switch, and a second end of the fifth switch is grounded; A control unit, used to control the on and off of the first switch, the second switch, the third switch, the fourth switch, and the fifth switch, wherein: The control unit controls the first switch, the fourth switch and the fifth switch to be turned on and the third switch and the second switch to be turned off, so as to provide a forward current to the coil, and when it is necessary to stop providing the forward current to the coil, the control unit controls the fifth switch to be turned off and then controls the first switch and the fourth switch to be turned off; The control unit controls the third switch, the second switch and the fifth switch to be turned on and the first switch and the fourth switch to be turned off to provide a reverse current to the coil, and when it is necessary to stop providing the reverse current to the coil, the control unit controls the fifth switch to be turned off and then controls the third switch and the second switch to be turned off.
2. The control circuit according to claim 1, wherein: The control unit is further configured to control the fifth switch to operate based on a pulse width modulation wave.
3. The control circuit according to claim 2, wherein: The fifth switch is an electronic switch, and a control end of the electronic switch is connected to the control unit.
4. The control circuit according to any one of claims 1 to 3, wherein: The first switch, the second switch, the third switch and the fourth switch are all mechanical switches.
5. The control circuit according to claim 1, wherein: The fifth switch is a mechanical switch.
6. A control method for a control circuit of a bistable permanent magnet mechanism, wherein the bistable permanent magnet mechanism comprises a coil, and the control circuit comprises: a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a diode, wherein a first end of the first switch, a first end of the third switch and a cathode of the diode are all connected to the power supply, a second end of the first switch is connected to a first end of the coil, a second end of the third switch is connected to a second end of the coil, a first end of the second switch is connected to a first end of the coil, a first end of the fourth switch is connected to a second end of the coil, a second end of the second switch, a second end of the fourth switch and an anode of the diode are connected to a first end of the fifth switch, and a second end of the fifth switch is grounded; a control unit, used for controlling the conduction and disconnection of the first switch, the second switch, the third switch, the fourth switch and the fifth switch; The control method comprises: The control unit controls the first switch, the fourth switch and the fifth switch to be turned on and the third switch and the second switch to be turned off, so as to provide a forward current to the coil, and when it is necessary to stop providing the forward current to the coil, the control unit controls the fifth switch to be turned off and then controls the first switch and the fourth switch to be turned off; The control unit controls the third switch, the second switch and the fifth switch to be turned on and the first switch and the fourth switch to be turned off to provide a reverse current to the coil. When it is necessary to stop providing the reverse current to the coil, the control unit controls the fifth switch to be turned off and then controls the third switch and the second switch to be turned off.
7. The control method according to claim 6, wherein: The control unit is further used to control the fifth switch to operate based on a pulse width modulation wave; The control method further includes controlling the fifth switch to operate based on a pulse width modulation wave by the control unit.
8. The control method according to claim 7, wherein: The fifth switch is an electronic switch, and a control end of the electronic switch is connected to the control unit.
9. The control method according to any one of claims 6 to 8, wherein: The first switch, the second switch, the third switch and the fourth switch are all mechanical switches.
10. The control method according to claim 6, wherein: The fifth switch is a mechanical switch.