Voltage absorption circuit, electronic lock motor and electric automobile

Abstract

The invention discloses a voltage absorption circuit, an electronic lock motor used together with the voltage absorption circuit and an electric vehicle comprising the electronic lock motor. The voltage absorbing circuit is used for absorbing voltage generated by a device (namely an electronic lock motor) connected in parallel with the voltage absorbing circuit at the moment of power failure and opposite to voltage applied to the device when the device is powered, and comprises a first normally-closed switch, a second normally-closed switch and a third normally-closed switch, the switch is configured to be switched off when the device is powered on and switched on when the device is powered off; and a first varistor connected in series with the first normally closed switch and configured to provide a first high resistance to prevent the device from being short-circuited due to the first normally closed switch not being turned off in time when the device is powered, and to provide a first low resistance capable of forming a short circuit when the device is powered off.

Description

Technical Field

[0001] This invention relates to the field of mechatronics, specifically to a voltage absorption circuit, an electronic lock motor, and an electric vehicle. Background Technology

[0002] The electronic lock is a crucial component of electric vehicle charging, typically integrated as a separate module within the charging port. It ensures the charging gun is locked during charging, preventing safety issues. The electronic lock's bolt extends when powered in the forward direction to lock and retracts when powered in the reverse direction to unlock. However, because the bolt retracts slightly after the forward voltage is removed (i.e., power is cut off), the resulting reverse voltage prevents it from fully retracting and properly locking the charging gun. This allows the charging gun to be easily pulled off during charging, causing charging malfunctions. Furthermore, the bolt extends slightly after the reverse voltage is removed (i.e., power is cut off), preventing it from fully retracting and unlocking the charging gun.

[0003] Therefore, there is an urgent need to provide a circuit that can absorb the generated reverse voltage to securely lock the charging gun and fully unlock it. Summary of the Invention

[0004] In view of the above problems, the present invention provides a voltage absorption circuit for absorbing a voltage generated by a device connected in parallel with the voltage absorption circuit at the moment of power failure, which is opposite to the voltage applied to the device when the device is powered on. The voltage absorption circuit includes: a first normally closed switch configured to open when the device is powered on and close when the device is powered off; and a first variable resistor connected in series with the first normally closed switch and configured to provide a first high resistance to prevent the device from being short-circuited due to the first normally closed switch not opening in time when the device is powered on, and to provide a first low resistance capable of forming a short circuit when the device is powered off.

[0005] According to one aspect of the invention, the first normally closed switch is configured to open when the device is powered in the forward direction and close when the device is powered in the reverse direction and de-energized; and the first variable resistor is configured to provide the first high resistance when the device is powered in the forward direction.

[0006] According to one aspect of the invention, the voltage absorption circuit further includes: a first diode, connected in series with a first variable resistor and a first normally closed switch to form a first branch in parallel with the device, wherein the anode of the first diode is electrically connected to the anode of the device, and the cathode of the first diode is electrically connected to the first variable resistor; a second normally closed switch, configured to close when the device is forward-biased and de-energized, and to open when the device is reverse-biased; a second variable resistor, connected in series with the second normally closed switch and configured to provide a second high resistance to prevent the device from being short-circuited due to the second normally closed switch not opening in time when the device is reverse-biased, and to provide a second low resistance capable of forming a short circuit when the device is de-energized; and a second diode, connected in series with the second variable resistor and the second normally closed switch to form a second branch in parallel with the device, wherein the anode of the second diode is electrically connected to the cathode of the device, and the cathode of the second diode is electrically connected to the second variable resistor.

[0007] According to one aspect of the invention, the voltage absorption circuit is configured to: when the device is powered on in the forward direction, open a first branch by disconnecting the first normally closed switch and open a second branch by reverse blocking the second diode with the forward-powered voltage, so as to prevent the device from being short-circuited; and when the device is powered off, open a first branch by reverse blocking the first diode with a negative voltage opposite to the forward-powered voltage and open a second branch by forward conducting the second diode with the negative voltage, so that the negative voltage is absorbed by the conducting second diode.

[0008] According to one aspect of the invention, the voltage absorption circuit is further configured to: when the device is powered in reverse, open the second branch by disconnecting the second normally closed switch and open the first branch by reverse blocking the first diode with the reverse-powered voltage to prevent the device from being short-circuited; and when the device is de-powered, open the second branch by reverse blocking the second diode with a positive voltage opposite to the reverse-powered voltage and open the first branch by forward conducting the first diode with the positive voltage, so that the positive voltage is absorbed by the conducting first diode.

[0009] According to one aspect of the invention, the first normally closed switch includes a first contact and a first coil connected in parallel with the device, the positive terminal of the first coil being electrically connected to the positive terminal of the device, the negative terminal of the first coil being electrically connected to the negative terminal of the device, the first contact being connected in series with the first variable resistor and the first diode to form the first branch, and wherein the first coil is configured to generate a magnetic field when the device is positively powered to cause the first contact to open and not generate a magnetic field when the device is reversely powered and de-energized to cause the first contact to close.

[0010] According to one aspect of the invention, the second normally closed switch includes a second contact and a second coil connected in parallel with the device, the positive terminal of the second coil being electrically connected to the negative terminal of the device, the negative terminal of the second coil being electrically connected to the positive terminal of the device, the second contact being connected in series with the second variable resistor and the second diode to form a second branch, and wherein the second coil is configured to generate a magnetic field when the device is reverse-powered to cause the second contact to open and not generate a magnetic field when the device is forward-powered and de-powered to cause the second contact to close.

[0011] According to one aspect of the invention, the first normally closed switch and the second normally closed switch are configured as unipolar relays, and the first variable resistor and the second variable resistor are configured as resettable surface mount fuses.

[0012] According to one aspect of the invention, the first normally closed switch is configured to open when the device is powered in both the forward and reverse directions, and the first normally closed switch is connected in series with the first variable resistor to form a third branch connected in parallel with the device.

[0013] According to one aspect of the invention, the voltage absorption circuit is configured to: open the third branch by disconnecting the first normally closed switch when the device is powered in both the forward and reverse directions, so as to prevent the device from being short-circuited; and absorb the negative voltage opposite to the forward voltage and the positive voltage opposite to the reverse voltage through the short circuit formed by the first variable resistor when the device is de-energized.

[0014] According to one aspect of the invention, the first normally closed switch includes a first contact and a first coil connected in parallel with the device, one end of the first coil being electrically connected to the positive terminal of the device, the other end of the first coil being electrically connected to the negative terminal of the device, the first contact being connected in series with the first variable resistor to form the third branch, and wherein the first coil is configured to generate a magnetic field that causes the first contact to open when the device is powered in both the forward and reverse directions, and not to generate a magnetic field that causes the first contact to close when the device is de-energized.

[0015] According to one aspect of the invention, the first normally closed switch is configured as a non-polarized relay, and the first variable resistor is configured as a resettable surface mount fuse.

[0016] According to one aspect of the invention, the negative terminal of the device is grounded.

[0017] According to another aspect of the present invention, an electronic lock motor is provided, which is used to drive the bolt of an electronic lock to extend when powered in the forward direction to achieve a locking function and to drive the bolt of the electronic lock to retract when powered in the reverse direction to achieve an unlocking function, the electronic lock motor being used as a device connected in parallel with a voltage absorption circuit according to any of the preceding aspects.

[0018] According to another aspect of the present invention, an electric vehicle is provided, comprising an electronic lock for locking a charging gun in the charging port of the electric vehicle and an electronic lock motor according to the above aspect. Attached Figure Description

[0019] The above-described features, other objects, and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0020] Figure 1 A block diagram of a voltage absorption circuit according to a first embodiment of the present invention is shown schematically.

[0021] Figure 2 Schematic illustration of the corresponding Figure 1 A block diagram of a circuit;

[0022] Figure 3 A block diagram of a voltage absorption circuit according to a second embodiment of the present invention is schematically shown; and

[0023] Figure 4 Schematic illustration of the corresponding Figure 3 A block diagram of a circuit. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0027] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0028] This invention discloses a voltage absorption circuit 1000, 2000 (see...) Figures 1 to 4 The electronic lock motor 3000 used with the voltage absorption circuits 1000 and 2000, and an electric vehicle (not shown) including the electronic lock motor 3000 and an electronic lock for locking the charging gun in the charging port of the electric vehicle.

[0029] The electronic lock motor 3000 is used to drive the bolt of the electronic lock to extend when powered in the forward direction to achieve the locking function of locking the charging gun in the charging port of the electric vehicle, and to drive the bolt of the electronic lock to retract when powered in the reverse direction to achieve the unlocking function of unlocking the charging gun from the charging port of the electric vehicle. The electronic lock motor 3000 is used as a device connected in parallel with the voltage absorption circuits 1000 and 2000.

[0030] Although the present invention uses the electronic lock motor 3000 as an example of a device used in conjunction with voltage absorption circuits 1000 and 2000, those skilled in the art should understand that this is not limiting, and voltage absorption circuits 1000 and 2000 can also be used with any other device that needs to eliminate reverse voltage generated during power failure.

[0031] The voltage absorption circuits 1000 and 2000 are used to absorb the reverse voltage generated by the electronic lock motor 3000 connected in parallel with the voltage absorption circuits 1000 and 2000 at the moment of power failure. This reverse voltage is opposite to the voltage Uin (which can also be referred to as the input voltage, the value of which is, for example, ±12V) applied to the electronic lock motor 3000 when it is powered on. This reverse voltage causes the electronic lock motor 3000 to produce an action opposite to the action under voltage Uin (e.g., extension) (e.g., retraction), so that the electronic lock motor 3000 cannot lock the charging gun in the charging port of the electric vehicle.

[0032] The reverse voltage is typically less than 50% of the voltage Uin. For ease of description, the voltage Uin and the reverse voltage are quantified below based on practical experience. When the electronic lock motor 3000 is powered in the forward direction, the voltage Uin is positive: +12V, and the reverse voltage is negative: -3V. When the electronic lock motor 3000 is powered in the reverse direction, the voltage Uin is negative: -12V, and the reverse voltage is positive: +3V.

[0033] refer to Figures 1 to 2 The voltage absorption circuit 1000 according to a first embodiment of the present invention is described. The voltage absorption circuit 1000 includes a first branch 1100 and a second branch 1200 connected in parallel with the electronic lock motor 3000.

[0034] Branch Road 1100 includes: along Figure 1 The first diode 400, the first variable resistor 300, and the first normally closed switch 100 are connected in series vertically from top to bottom. The driving terminal 101 of the first normally closed switch 100 and the positive terminal of the first diode 400 are both electrically connected to the positive terminal P of the electronic lock motor 3000, so that the driving terminal 101 drives the first normally closed switch 100 to open when the electronic lock motor 3000 is positively powered. The negative terminal of the first diode 400 is electrically connected to the first variable resistor 300.

[0035] The first normally closed switch 100 is configured to open when the electronic lock motor 3000 is forward-biased (i.e., the high potential of the voltage Uin applied to the electronic lock motor 3000 is located at the positive terminal P of the electronic lock motor 3000, and the low potential of the voltage Uin is located at the negative terminal N of the electronic lock motor 3000), and to close when the electronic lock motor 3000 is reverse-biased and de-energized. The first variable resistor 300 is configured to provide a first high resistance when the electronic lock motor 3000 is forward-biased, preventing a short circuit in the electronic lock motor 3000 due to the first normally closed switch 100 not opening in time if the first diode 400 is turned on while the electronic lock motor 3000 is forward-biased. The first variable resistor 300 is also configured to provide a first low resistance capable of forming a short circuit when the electronic lock motor 3000, which is reverse-biased, is de-energized. The value of the first low resistance can be close to 0Ω or 0Ω.

[0036] The second branch road 1200 includes: along Figure 1 The electronic lock motor 3000 consists of a second normally closed switch 500, a second variable resistor 600, and a second diode 700 connected in series vertically from top to bottom. The drive terminal 501 of the second normally closed switch 500 and the positive terminal of the second diode 700 are both electrically connected to the negative terminal N of the electronic lock motor 3000. This allows the drive terminal 501 to open the second normally closed switch 500 when the electronic lock motor 3000 is powered in reverse. The negative terminal of the second diode 700 is electrically connected to the second variable resistor 600.

[0037] The second normally closed switch 500 is configured to close when the electronic lock motor 3000 is powered on in the forward direction and when it is powered off, and to open when the electronic lock motor 3000 is powered on in the reverse direction (i.e., the low potential of the voltage Uin applied to the electronic lock motor 3000 is located at the positive terminal P of the electronic lock motor 3000, and the high potential of the voltage Uin is located at the negative terminal N of the electronic lock motor 3000). The second variable resistor 600 is configured to provide a second high resistance when the electronic lock motor 3000 is powered on in the reverse direction, preventing the electronic lock motor 3000 from being short-circuited due to the second normally closed switch 500 not opening in time if the second diode 700 is turned on due to the reverse power supply. The second variable resistor 600 is also configured to provide a second low resistance capable of forming a short circuit when the electronic lock motor 3000, which is powered on in the forward direction, is powered off. The value of the second low resistance can be close to 0Ω or can be 0Ω.

[0038] See also Figure 1 The working principle of the voltage absorption circuit 1000 can be described as follows.

[0039] When the electronic lock motor 3000 is powered in the forward direction, the first branch 1100 is opened by disconnecting the first normally closed switch 100, and the second branch 1200 is opened by reverse blocking the second diode 700 through the forward-powered voltage, thus preventing the electronic lock motor 3000 from being short-circuited. When the electronic lock motor 3000, which is powered in the forward direction, is de-powered, the first branch 1100 is opened by reverse blocking the first diode 400 through a negative voltage opposite to the forward-powered voltage Uin, and the second diode 700 is forward-powered through a negative voltage applied to the second branch 1200. As described above, at this time, the second variable resistor 600 provides a second low resistance and the second normally closed switch 500 is closed, which makes the second branch 1200 a closed circuit, and the negative voltage is absorbed by the conducting second diode 700. For example, in this invention, assuming that the second diode 700 is a silicon diode, the voltage drop across the second diode 700 when it is turned on (i.e., the on-state voltage) is -0.7V. Therefore, the negative voltage (i.e., -3V) is reduced to -0.7V by the turned-on second diode 700.

[0040] Furthermore, when the electronic lock motor 3000 is powered by reverse, the second branch 1200 is opened by disconnecting the second normally closed switch 500, and the first branch 1100 is opened by reverse blocking the first diode 400 through the reverse power supply voltage, so as to avoid short-circuiting the electronic lock motor 3000. When the electronic lock motor 3000 powered by reverse is de-energized, the second branch 1200 is opened by reverse blocking the second diode 700 through a positive voltage opposite to the reverse power supply voltage Uin, and the first diode 400 is forward-conducted through the first branch 1100 by the positive voltage applied. As described above, at this time, the first variable resistor 300 provides a first low resistance and the first normally closed switch 100 is closed, which makes the first branch 1100 a closed circuit, and the positive voltage is absorbed by the conducting first diode 400. For example, in this invention, assuming the first diode 400 is a silicon diode, the voltage drop across the first diode 400 (i.e., the forward voltage) is +0.7V. Therefore, the positive voltage (i.e., +3V) is reduced to +0.7V by the conducting first diode 400.

[0041] Those skilled in the art should understand that diodes 400 and 700 are not limited to silicon diodes; germanium diodes can also be selected according to actual needs. Since the forward voltage of a germanium diode is 0.3V, the aforementioned reverse voltage ±3V can be reduced to ±0.3V.

[0042] The voltage absorption circuit 1000 absorbs or reduces the negative voltage -3V generated by the electronic lock motor 3000 when it is powered off, which is opposite to the voltage Uin=+12V applied to the electronic lock motor 3000 when it is powered on, to -0.7V through the second branch 1200. This greatly reduces the value of the reverse voltage and reduces the length of the lock tongue of the electronic lock motor 3000 that would be retracted due to the -3V reverse voltage generated when the electronic lock motor 3000 is powered off after the charging gun is locked in the charging port of the electric vehicle. This reduces the risk of the charging gun not locking properly or even being unlocked due to the retraction of the lock tongue.

[0043] Furthermore, the voltage absorption circuit 1000 absorbs or reduces the positive voltage +3V generated by the electronic lock motor 3000 at the moment of power failure, which is opposite to the voltage Uin=-12V applied to the electronic lock motor 3000 when it is powered in reverse, to +0.7V through the first branch 1100. This greatly reduces the value of the reverse voltage and reduces the length of the lock tongue of the electronic lock motor 3000 caused by the +3V reverse voltage generated when the electronic lock motor 3000 is powered off after the charging gun is unlocked from the charging port of the electric vehicle. This reduces the risk of the charging gun not being fully unlocked or even not unlocked due to the extension of the lock tongue.

[0044] See Figure 2 The first normally closed switch 100 and the second normally closed switch 500 are configured as unipolar relays, and the first variable resistor 300 and the second variable resistor 600 are configured as resettable surface mount fuses. However, the invention is not limited thereto, and any suitable components can be selected as needed to implement the functions of the normally closed switches 100 and 500 and the variable resistors 300 and 600.

[0045] See also Figure 2 The first normally closed switch 100, configured as a unipolar relay, includes a first contact 110 (in... Figure 2 (shown as a single-pole double-throw switch) and a first coil 120 connected in parallel with the electronic lock motor 3000, the positive terminal of the first coil 120 (in) Figure 2 The first contact 110 is electrically connected to the positive terminal of the electronic lock motor 3000 (represented by "+") to serve as the drive terminal 101, such that when the electronic lock motor 3000 is positively powered, it drives the first coil 120 to generate a magnetic field. The negative terminal of the first coil 120 is electrically connected to the negative terminal of the electronic lock motor 3000's ground (represented by the symbol "GND" in the figure). The first contact 110 is connected in series with the first variable resistor 300 and the first diode 400 to form the first branch 1100. The first coil 120 is configured to generate a magnetic field when the electronic lock motor 3000 is positively powered, causing the first contact 110 to... Figure 2The lower grounded line is disconnected to electrically connect to the upper disconnected line to disconnect the first normally closed switch 100, and no magnetic field is generated when the electronic lock motor 3000 is reverse-powered and de-energized, so that the first contact 110 is electrically connected to the lower grounded line to close the first normally closed switch 100.

[0046] Similarly, the second normally closed switch 500, also configured as a unipolar relay, includes a second contact 510 (in... Figure 2 (shown as a single-pole double-throw switch) and a second coil 520 connected in parallel with the electronic lock motor 3000, the positive terminal of the second coil 520 (in) Figure 2 The second contact 510 (indicated by a "+") is electrically connected to the negative terminal of the electronic lock motor 3000 to serve as a drive terminal 501, such that when the electronic lock motor 3000 is reverse-powered, it drives the second coil 520 to generate a magnetic field. The negative terminal of the second coil 520 is electrically connected to the positive terminal of the electronic lock motor 3000. The second contact 510 is connected in series with the second variable resistor 600 and the second diode 700 to form the second branch 1200. The second coil 520 is configured to generate a magnetic field when the electronic lock motor 3000 is reverse-powered, causing the second contact 510 to... Figure 2 The lower grounded line is disconnected to electrically connect to the upper disconnected line to disconnect the second normally closed switch 500, and no magnetic field is generated when the electronic lock motor 3000 is powered on and off, so that the second contact 510 is electrically connected to the lower grounded line to close the second normally closed switch 500.

[0047] refer to Figures 3 to 4 The voltage absorption circuit 2000 according to a second embodiment of the present invention is described. The voltage absorption circuit 2000 includes a third branch 2100 connected in parallel with the electronic lock motor 3000.

[0048] The third branch road 2100 includes: along Figure 3 The first variable resistor 300 and the first normally closed switch 200 are connected in series vertically from top to bottom. The drive terminal 201 of the first normally closed switch 200 is electrically connected to the positive terminal P of the electronic lock motor 3000.

[0049] Unlike the first normally closed switch 100 in the first embodiment, the first normally closed switch 200 in the second embodiment is configured to open when the electronic lock motor 3000 is powered in both the forward and reverse directions and close when the electronic lock motor 3000 is de-energized. That is, the drive end 201 drives the first normally closed switch 200 to open regardless of whether the electronic lock motor 3000 is powered in both the forward and reverse directions. The first variable resistor 300 is connected in series with the first normally closed switch 200 and is configured to provide a first high resistance to prevent the electronic lock motor 3000 from being short-circuited due to the first normally closed switch 200 failing to open in time when the electronic lock motor 3000 is powered in both forward and reverse directions, and to provide a first low resistance capable of forming a short circuit when the electronic lock motor 3000 is de-energized. This causes the reverse voltage (i.e., -3V and +3V) generated at the instant the electronic lock motor 3000 is de-energized, which is opposite to the voltage (i.e., +12V and -12V) applied to the electronic lock motor 3000 when it is powered on, to be short-circuited, i.e., because the third branch 2100 is grounded (in the figure, grounding is indicated by...). The "GND" symbol (as described below) is absorbed or reduced to 0V, greatly reducing the value of the reverse voltage. This not only reduces the length of the electronic lock motor 3000's latch retracting due to the -3V reverse voltage generated when the charging gun is locked into the electric vehicle's charging port and the power to the electronic lock motor 3000 is turned off, thus reducing the risk of the charging gun not locking properly or even being unlocked due to the latch retraction, but also reduces the length of the electronic lock motor 3000's latch extending due to the +3V reverse voltage generated when the charging gun is unlocked from the electric vehicle's charging port and the power to the electronic lock motor 3000 is turned off, thus reducing the risk of the charging gun not unlocking completely or even not being unlocked due to the latch extending.

[0050] That is, the voltage absorption circuit 2000 is configured to: open the third branch 2100 by disconnecting the first normally closed switch 200 when the electronic lock motor 3000 is powered in the forward direction and in the reverse direction, so as to avoid the electronic lock motor 3000 being short-circuited; and absorb the negative voltage opposite to the voltage of the forward power supply and the positive voltage opposite to the voltage of the reverse power supply through the short circuit formed by the first variable resistor 300 when the electronic lock motor 3000 is de-energized by the third branch 2100.

[0051] See Figure 4 The first normally closed switch 200 is configured as a non-polarized relay, and the first variable resistor 300 is configured as a resettable surface mount fuse. However, the invention is not limited thereto, and any suitable components can be selected as needed to implement the functions of the normally closed switch 200 and the variable resistor 300.

[0052] The first normally closed switch 200, configured as a non-polarized relay, includes a first contact 210 (in... Figure 4 The switch shown is a single-pole double-throw switch) and the electronic lock motor 3000 (for clarity, Figure 4 A first coil 220 (not shown) with no polarity (i.e., no distinction between positive and negative terminals) is connected in parallel with the electronic lock motor 3000. One end of the first coil 220 is electrically connected to the positive terminal of the electronic lock motor 3000 (i.e., either end of the first coil 220 can be used as the positive terminal), and the other end of the first coil 220 is electrically connected to the grounded negative terminal of the electronic lock motor 3000 (i.e., either end of the first coil 220 can be used as the negative terminal). The first contact 110 is connected in series with the first variable resistor 300 to form the third branch 2100. The first coil 120 is configured to generate a magnetic field when the electronic lock motor 3000 is powered in both forward and reverse directions, causing the first contact 110 to... Figure 4 The lower grounding line is disconnected to electrically connect to the upper disconnected line to disconnect the first normally closed switch 200, and no magnetic field is generated when the electronic lock motor 3000 is de-energized, so that the first contact 210 is electrically connected to the lower grounding line to close the first normally closed switch 200.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and are not described in detail. Furthermore, the definitions of the components described above are not limited to the various specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0054] It should also be noted that, in specific embodiments of the present invention, unless otherwise stated otherwise, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained from the content of the present invention. Specifically, all numbers used in the specification and claims to indicate dimensions, range conditions, etc., of the composition should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0055] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A voltage absorption circuit, characterized in that, The voltage absorption circuit is used to absorb a voltage generated at the moment of power failure of a device connected in parallel with the voltage absorption circuit, which is opposite to the voltage applied to the device when the device is powered on. The voltage absorption circuit includes: A first normally closed switch is configured to open when the device is powered on and close when the device is de-powered; and A first variable resistor is connected in series with the first normally closed switch and configured to provide a first high resistance to prevent the device from being short-circuited due to the first normally closed switch not being opened in time when the device is powered on, and to provide a first low resistance capable of forming a short circuit when the device is de-powered.

2. The voltage absorption circuit according to claim 1, characterized in that, The first normally closed switch is configured to open when the device is powered in the forward direction and close when the device is powered in the reverse direction and is de-energized. as well as The first variable resistor is configured to provide the first high resistance when the device is positively powered.

3. The voltage absorption circuit according to claim 2, characterized in that, Also includes: The first diode is connected in series with the first variable resistor and the first normally closed switch to form a first branch connected in parallel with the device. The positive terminal of the first diode is electrically connected to the positive terminal of the device, and the negative terminal of the first diode is electrically connected to the first variable resistor. The second normally closed switch is configured to close when the device is powered in the forward direction and when it is de-energized, and to open when the device is powered in the reverse direction. The second variable resistor is connected in series with the second normally closed switch and is configured to provide a second high resistance to prevent the device from being short-circuited due to the second normally closed switch not being opened in time when the device is reverse-powered, and to provide a second low resistance capable of forming a short circuit when the device is de-powered. and The second diode is connected in series with the second variable resistor and the second normally closed switch to form a second branch in parallel with the device. The positive terminal of the second diode is electrically connected to the negative terminal of the device, and the negative terminal of the second diode is electrically connected to the second variable resistor.

4. The voltage absorption circuit according to claim 3, characterized in that, The voltage absorption circuit is configured to: When the device is powered in the forward direction, the first branch is opened by disconnecting the first normally closed switch and the second branch is opened by reversing the voltage of the forward-powered diode to prevent the device from being short-circuited. as well as When the device is de-energized, the first branch is opened by reverse blocking the first diode with a negative voltage that is opposite to the positive supply voltage, and the second branch is opened by forward conducting the second diode with the negative voltage, so that the negative voltage is absorbed by the conducting second diode.

5. The voltage absorption circuit according to claim 4, characterized in that, The voltage absorption circuit is further configured to: When the device is powered in reverse, the second branch is opened by disconnecting the second normally closed switch and the first branch is opened by reverse cutting off the first diode through the reverse power supply voltage, so as to avoid the device being short-circuited. as well as When the device is de-energized, the second branch is opened by reverse blocking the second diode with a positive voltage that is opposite to the reverse-supply voltage, and the first branch is opened by forward conducting the first diode with the positive voltage, so that the positive voltage is absorbed by the conducting first diode.

6. The voltage absorption circuit according to any one of claims 3 to 5, characterized in that, The first normally closed switch includes a first contact and a first coil connected in parallel with the device. The positive terminal of the first coil is electrically connected to the positive terminal of the device, and the negative terminal of the first coil is electrically connected to the negative terminal of the device. The first contact is connected in series with the first variable resistor and the first diode to form the first branch. The first coil is configured to generate a magnetic field when the device is powered in the forward direction, causing the first contact to open, and not to generate a magnetic field when the device is powered in the reverse direction or de-energized, causing the first contact to close.

7. The voltage absorption circuit according to claim 6, characterized in that, The second normally closed switch includes a second contact and a second coil connected in parallel with the device. The positive terminal of the second coil is electrically connected to the negative terminal of the device, and the negative terminal of the second coil is electrically connected to the positive terminal of the device. The second contact is connected in series with the second variable resistor and the second diode to form the second branch. The second coil is configured to generate a magnetic field when the device is powered in reverse to cause the second contact to open, and not to generate a magnetic field when the device is powered in the forward direction and de-energized to cause the second contact to close.

8. The voltage absorption circuit according to any one of claims 3 to 5 and 7, characterized in that, The first normally closed switch and the second normally closed switch are configured as unipolar relays, and the first variable resistor and the second variable resistor are configured as resettable surface mount fuses.

9. The voltage absorption circuit according to claim 1, characterized in that, The first normally closed switch is configured to open both when the device is powered in the forward direction and in the reverse direction, and The first normally closed switch and the first variable resistor are connected in series to form a third branch that is connected in parallel with the device.

10. The voltage absorption circuit according to claim 9, characterized in that, The voltage absorption circuit is configured to: When the device is powered in both the forward and reverse directions, the third branch is opened by disconnecting the first normally closed switch to prevent the device from being short-circuited. as well as When the device is de-energized, the negative voltage opposite to the positive voltage and the positive voltage opposite to the reverse voltage are absorbed by the third branch through the short circuit formed by the first variable resistor.

11. The voltage absorption circuit according to claim 10, characterized in that, The first normally closed switch includes a first contact and a first coil connected in parallel with the device. One end of the first coil is electrically connected to the positive terminal of the device, and the other end of the first coil is electrically connected to the negative terminal of the device. The first contact and the first variable resistor are connected in series to form the third branch. The first coil is configured to generate a magnetic field that causes the first contact to open when the device is powered in both the forward and reverse directions, and not to generate a magnetic field that causes the first contact to close when the device is powered off.

12. The voltage absorption circuit according to any one of claims 9 to 11, characterized in that, The first normally closed switch is configured as a non-polarized relay, and the first variable resistor is configured as a resettable surface mount fuse.

13. The voltage absorption circuit according to any one of claims 1 to 5, 7, 9 to 11, characterized in that, The negative terminal of the device is grounded.

14. An electronic lock motor, characterized in that, The electronic lock motor is used to drive the bolt of the electronic lock to extend when powered in the forward direction to achieve the locking function and to drive the bolt of the electronic lock to retract when powered in the reverse direction to achieve the unlocking function. The electronic lock motor is used as a device connected in parallel with the voltage absorption circuit according to any one of claims 1 to 13.

15. An electric vehicle, characterized in that, Includes an electronic lock for locking the charging gun in the charging port of the electric vehicle and an electronic lock motor as claimed in claim 14.

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