Voltage absorption circuits, electronic lock motors, and electric vehicles

Abstract

To prevent the charging gun from becoming locked when the power supply is cut off during the charging of an electric vehicle. [Solution] The voltage absorption circuit 2000 in the electronic lock of the charging gun includes a first normally closed switch 200 which is connected in parallel with the voltage absorption circuit, i.e., an electronic lock motor 3000, to absorb the reverse voltage of the voltage applied when the device is energized, which occurs at the moment the device becomes de-energized, and which opens when the device is energized and closes when the device becomes de-energized, and a first variable resistance element 300 which is connected in series with the first normally closed switch and is configured to provide a first high resistance that prevents the device from short-circuiting due to the first normally closed switch not opening in a timely manner when the device is energized, and a first low resistance that can form a short circuit when the device becomes de-energized.

Description

Technical Field

[0001] Cross - reference to Related Applications This application was filed on September 13, 2024, claims the priority of Chinese Patent Application No. 202411291138.1 entitled "Voltage Absorption Circuit, Electronic Lock Motor and Electric Vehicle", and the entire disclosure thereof is incorporated herein by reference.

[0002] This application relates to the field of mechatronic devices, and more particularly, to voltage absorption circuits, electronic lock motors and electric vehicles.

Background Art

[0003] The electronic lock is an important functional component for charging an electric vehicle. Usually, by being incorporated into the charging socket as a separate module, it ensures the locking of the charging gun during charging and avoids safety problems. The locking tongue of the electronic lock can protrude outward to perform the locking function when the electronic lock is energized in the forward direction, and can retract inward to perform the unlocking function when the electronic lock is energized in the reverse direction. The locking tongue of the electronic lock is opposite to the voltage applied to the electronic lock in the forward - energized direction, and due to the action of the voltage generated after the forward - energized voltage is removed (i.e., when it is in the non - energized state), it retracts a short distance, resulting in an insufficient protrusion length of the locking tongue, and the charging gun may not be firmly locked. As a result, the charging gun can be easily pulled out by a slight external force during the charging process, which may lead to abnormal charging. Also, the locking tongue of the electronic lock is opposite to the voltage applied to the electronic lock in the reverse - energized direction, and due to the action of the voltage generated after the reverse - energized voltage is removed (i.e., when it is in the non - energized state), it protrudes a short distance, so the locking tongue may not fully retract, and the charging gun may not be fully unlocked.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, it is necessary to provide a circuit that absorbs the generated reverse voltage, securely locks the charging gun, and completely unlocks the charging gun. [Means for solving the problem]

[0005] In view of the above problems, this application provides a voltage absorption circuit, wherein the voltage absorption circuit is configured to absorb a reverse voltage, which is the reverse of the voltage applied to the device when it is energized, generated at the moment the device becomes de-energized by a device connected in parallel with the voltage absorption circuit, and the voltage absorption circuit comprises a first normally closed switch configured to open when the device is energized and to close when the device becomes de-energized, and a first variable resistance element connected in series with the first normally closed switch, which provides a first high resistance that prevents the device from short-circuiting due to the first normally closed switch not opening in a timely manner (at the appropriate timing, with good timing, in time) when the device is energized, and provides a first low resistance that can form a short circuit when the device becomes de-energized.

[0006] According to one aspect of this application, a first normally closed switch is configured to open when the device is energized in the forward direction and to close when the device is energized in the reverse direction and when the device is de-energized, and a first variable resistor element is configured to produce a first high resistance when the device is energized in the forward direction.

[0007] According to one aspect of this application, the voltage absorption circuit comprises a first diode, the first diode being connected in series with a first variable resistor element and a first normally closed switch to form a first branch connected in parallel with the device, the anode of the first diode being electrically connected to the anode of the device and the cathode of the first diode being electrically connected to the first variable resistor element, a second normally closed switch configured to close when the device is energized in the forward direction and when the device is de-energized, and to open when the device is energized in the reverse direction, and a voltage absorption circuit connected in series with the second normally closed switch, the device being in the reverse direction The device comprises a second variable resistor element configured to provide a second high resistance that prevents the device from short-circuiting due to the second normally closed switch not opening in a timely manner when energized, and a second low resistance that allows a short circuit to form when the device is de-energized; and a second diode, the second diode being connected in series with the second variable resistor element and the second normally closed switch in sequence to form a second branch connected in parallel with the device, the anode of the second diode being electrically connected to the cathode of the device, and the cathode of the second diode being electrically connected to the second variable resistor element.

[0008] According to one aspect of this application, the voltage absorption circuit is configured such that when the device is energized in the positive direction, it opens a first normally closed switch to form an open circuit at the first branch, and the positively energized voltage reverses the second diode to form an open circuit at the second branch, thereby preventing the device from short-circuiting. When the device is de-energized, a negative voltage, which is the opposite of the positively energized voltage, reverses the first diode to form an open circuit at the first branch, and the negative voltage conducts the second diode in the positive direction to form a closed circuit at the second branch, thereby absorbing the negative voltage with the conducting second diode.

[0009] According to one aspect of this application, the voltage absorption circuit is further configured such that when the device is energized in the reverse direction, it opens a second normally closed switch to form an open circuit at the second branch, the reverse-directed voltage interrupts the first diode in the reverse direction to form an open circuit at the first branch, thereby preventing the device from short-circuiting, and when the device is de-energized, a positive voltage, which is the opposite of the reverse-directed voltage, interrupts the second diode in the reverse direction to form an open circuit at the second branch, the positive voltage conducts the first diode in the positive direction to form a closed circuit at the first branch, and the conducting first diode absorbs the positive voltage.

[0010] According to one aspect of this application, the first normally closed switch comprises a first contact and a first coil connected in parallel with the device, wherein the anode of the first coil is electrically connected to the anode of the device, and the cathode of the first coil is electrically connected to the cathode of the device, the first contact forms a first branch by being connected in series with a first variable resistor and a first diode in that order, and the first coil is configured to generate a magnetic field to open the first contact when the device is energized in the forward direction, and to close the first contact without generating a magnetic field when the device is energized in the reverse direction and when the device is de-energized.

[0011] According to one aspect of this application, the second normally closed switch comprises a second contact and a second coil connected in parallel with the device, wherein the anode of the second coil is electrically connected to the cathode of the device, the cathode of the second coil is electrically connected to the anode of the device, the second contact forms a second branch by being connected in series with a second variable resistor and a second diode in that order, and the second coil is configured to generate a magnetic field to open the second contact when the device is energized in the reverse direction, and to close the second contact without generating a magnetic field when the device is energized in the forward direction and when the device is de-energized.

[0012] According to one aspect of this application, both the first normally closed switch and the second normally closed switch are configured as single-pole relays, and both the first variable resistor element and the second variable resistor element are configured as resettable surface-mount fuses.

[0013] According to one aspect of this application, the first normally closed switch is configured to open both when the device is energized in the forward direction and when the device is energized in the reverse direction, and the first normally closed switch is connected in series with the first variable resistor element to form a third branch connected in parallel with the device.

[0014] According to one aspect of this application, the voltage absorption circuit is configured to open a third branch by opening a first normally closed switch when the device is energized in the forward direction and when the device is energized in the reverse direction, thereby preventing the device from short-circuiting, and when the device is de-energized, the third branch absorbs the negative voltage which is the reverse of the voltage energized in the forward direction and the positive voltage which is the reverse of the voltage energized in the reverse direction through a short circuit formed by the first variable resistor element.

[0015] According to one aspect of this application, the first normally closed switch comprises a first contact and a first coil connected in parallel with the device, wherein one of the cathode and anode of the first coil is electrically connected to the anode of the device, and the other of the cathode and anode of the first coil is electrically connected to the cathode of the device, the first contact forms a third branch by being connected in series with a first variable resistor element, and the first coil is configured to generate a magnetic field to open the first contact when the device is energized in the forward direction and when the device is energized in the reverse direction, and to close the first contact without generating a magnetic field when the device is de-energized.

[0016] According to one aspect of this application, the first normally closed switch is configured as a non-polarized relay, and the first variable resistor element is configured as a resettable surface-mount fuse.

[0017] According to one aspect of this application, the cathode of the device is grounded.

[0018] In another aspect of this application, the application provides an electronic lock motor, wherein when the electronic lock motor is energized in the forward direction, the electronic lock motor is configured to drive the lock tongue of the electronic lock to protrude outward to perform a locking function, and when the electronic lock motor is energized in the reverse direction, the lock tongue of the electronic lock to retract inward to perform an unlocking function, and the electronic lock motor is used as a device connected in parallel with a voltage absorption circuit according to any one of the above aspects.

[0019] In yet another aspect of this application, the application provides an electric vehicle comprising an electronic lock for locking a charging gun to a charging socket of the electric vehicle, and an electronic lock motor according to the above aspect.

[0020] The context and other purposes, features and advantages of this application will become clearer from the following description of embodiments of this application with reference to the accompanying drawings. [Brief explanation of the drawing]

[0021] [Figure 1] This is a schematic block diagram of a voltage absorption circuit according to the first embodiment of this application. [Figure 2] This is a schematic circuit diagram corresponding to the block diagram in Figure 1. [Figure 3] This is a schematic block diagram of a voltage absorption circuit according to a second embodiment of this application. [Figure 4] This is a schematic circuit diagram corresponding to the block diagram in Figure 3. [Modes for carrying out the invention]

[0022] Here, embodiments of the present application will be described with reference to the drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present application. In the following detailed description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted in order to avoid unnecessarily obscuring the concepts of the present application.

[0023] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. Terms such as "including" and "comprising" used in this specification indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0024] All terms used in this specification (including technical and scientific terms) shall have the meaning generally understood by those skilled in the art unless otherwise defined. It should be noted that the terms used in this specification should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly strict manner.

[0025] When expressions such as "at least one of A, B, and C" are used, they should generally be interpreted according to the meaning of the expressions generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" includes, but is not limited to, a system having only A, a system having only B, a system having only C, 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).

[0026] This application discloses an electric vehicle (not shown) comprising voltage absorption circuits 1000, 2000 (see Figures 1 to 4), an electronic lock motor 3000 used in conjunction with the voltage absorption circuits 1000, 2000, and an electronic lock for locking the charging gun to the charging socket of the electric vehicle.

[0027] The electronic lock motor 3000 is configured to, when energized in the forward direction, drive the lock tongue of the electronic lock, causing it to protrude outward to perform a locking function that locks the charging gun into the charging socket of the electric vehicle. Conversely, the electronic lock motor 3000 is configured to, when energized in the reverse direction, drive the lock tongue of the electronic lock, causing it to retract inward to perform an unlocking function that unlocks the charging gun from the charging socket 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.

[0028] This application uses the electronic lock motor 3000 as an example of a device used in conjunction with voltage absorption circuits 1000 and 2000, but those skilled in the art should understand that this is not an limitation, and that the voltage absorption circuits 1000 and 2000 may be used with any other device that needs to eliminate reverse voltage generated at the moment of de-energization.

[0029] The voltage absorption circuits 1000 and 2000 are configured to absorb a reverse voltage, which is the inverse of the voltage Uin (sometimes called the input voltage, the value of which is, for example, ±12V) applied to the electronic lock motor 3000 when it is energized, generated at the moment the electronic lock motor 3000 becomes de-energized. The reverse voltage causes the electronic lock motor 3000 to perform the opposite action (e.g., retraction) of the action (e.g., protrusion) caused by the voltage Uin, and therefore the electronic lock motor 3000 may fail to lock the charging gun into the charging socket of the electric vehicle.

[0030] The reverse voltage is typically less than 50% of the voltage Uin. For the sake of explanation, the voltage Uin and reverse voltage are described quantitatively below according to practical circumstances. When the electronic lock motor 3000 is energized in the forward direction, the voltage Uin is a positive voltage of +12V, and the reverse voltage is a negative voltage of -3V. When the electronic lock motor 3000 is energized in the reverse direction, the voltage Uin is a negative voltage of -12V, and the reverse voltage is a positive voltage of +3V.

[0031] A voltage absorption circuit 1000 according to the first embodiment of this application will be described with reference to Figures 1 and 2. The voltage absorption circuit 1000 comprises a first branch 1100 and a second branch 1200, respectively, connected in parallel with the electronic lock motor 3000.

[0032] The first branch 1100 comprises a first diode 400, a first variable resistor element 300, and a first normally closed switch 100, which are connected in series from top to bottom in the vertical direction of Figure 1. The drive terminal 101 of the first normally closed switch 100 and the anode of the first diode 400 are both electrically connected to the anode P of the electronic lock motor 3000. As a result, when the electronic lock motor 3000 is energized in the positive direction, the drive terminal 101 drives the first normally closed switch 100 to open it. The cathode of the first diode 400 is electrically connected to the first variable resistor element 300.

[0033] The first normally closed switch 100 is configured to open when the electronic lock motor 3000 is energized in the forward direction (i.e., when the high potential of the voltage Uin applied to the electronic lock motor 3000 is at the anode P of the electronic lock motor 3000 and the low potential of the voltage Uin is at the cathode N of the electronic lock motor 3000), and to close when the electronic lock motor 3000 is energized in the reverse direction and when the electronic lock motor 3000 is de-energized. The first variable resistor element 300 is configured to provide a first high resistance when the electronic lock motor 3000 is energized in the forward direction. The first high resistance prevents the electronic lock motor 3000 from short-circuiting due to the first normally closed switch 100 not opening in a timely manner when the first diode 400 conducts as a result of the electronic lock motor 3000 being energized in the positive direction. The first variable resistance element 300 is further configured to provide a first low resistance that can form a short circuit when the electronic lock motor 3000, which is energized in the reverse direction, becomes de-energized. The value of the first low resistance may be close to 0Ω or 0Ω.

[0034] The second branch 1200 comprises a second normally closed switch 500, a second variable resistor element 600, and a second diode 700, which are connected in series from top to bottom in the vertical direction of Figure 1. The drive terminal 501 of the second normally closed switch 500 and the anode of the second diode 700 are both electrically connected to the cathode N of the electronic lock motor 3000. As a result, when the electronic lock motor 3000 is energized in the reverse direction, the drive terminal 501 drives the second normally closed switch 500 to open it. The cathode of the second diode 700 is electrically connected to the second variable resistor element 600.

[0035] The second normally closed switch 500 is configured to close when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is de-energized, and to open when the electronic lock motor 3000 is energized in the reverse direction (i.e., when the low potential of the voltage Uin applied to the electronic lock motor 3000 is at the anode P of the electronic lock motor 3000 and the high potential of the voltage Uin is at the cathode N of the electronic lock motor 3000). The second variable resistor element 600 is configured to provide a second high resistance when the electronic lock motor 3000 is energized in the reverse direction. The second high resistance prevents the electronic lock motor 3000 from short-circuiting due to the second normally closed switch 500 not opening in a timely manner when the second diode 700 conducts as a result of the electronic lock motor 3000 being energized in the reverse direction. The second variable resistance element 600 is further configured to provide a second low resistance that can form a short circuit when the electronic lock motor 3000, which is energized in the forward direction, becomes de-energized. The value of the second low resistance may be close to 0Ω or 0Ω.

[0036] Referring to Figure 1, the operating principle of the voltage absorption circuit 1000 will be explained below.

[0037] When the electronic lock motor 3000 is energized in the positive direction, the first normally closed switch 100 opens, causing the first branch 1100 to form an open circuit. The second diode 700 is then interrupted in the reverse direction by the voltage applied in the positive direction, causing the second branch 1200 to form an open circuit, thereby preventing the electronic lock motor 3000 from short-circuiting. When the electronic lock motor 3000, which is energized in the positive direction, is de-energized, the first diode 400 is interrupted in the reverse direction by applying a negative voltage, which is the inverse of the voltage Uin applied in the positive direction, to the first branch 1100, thus causing the first branch 1100 to form an open circuit. The second diode 700 then conducts in the positive direction by applying a negative voltage to the second branch 1200. As described above, at this time, the second variable resistor element 600 provides a second low resistance, and the second normally closed switch 500 is closed, so the second branch 1200 forms a closed circuit, and the negative voltage is absorbed by the conducting second diode 700. For example, in this application, it is assumed that the second diode 700 is a silicon diode, and the voltage drop across the second diode 700 when conducting (i.e., the conduction voltage) is -0.7V, so the negative voltage (i.e., -3V) is reduced to -0.7V by the conducting second diode 700.

[0038] Furthermore, when the electronic lock motor 3000 is energized in the reverse direction, the second normally closed switch 500 opens, causing the second branch 1200 to form an open circuit. The first diode 400 is then interrupted in the reverse direction by the reverse-directed voltage, causing the first branch 1100 to form an open circuit, thereby preventing the electronic lock motor 3000 from short-circuiting. When the electronic lock motor 3000, which is energized in the reverse direction, becomes de-energized, the second diode 700 is interrupted in the reverse direction by applying a positive voltage, which is the inverse of the reverse-directed voltage Uin, to the second branch 1200, thus causing the second branch 1200 to form an open circuit. The first diode 400 then conducts in the positive direction by applying a positive voltage to the first branch 1100. As described above, at this time, the first variable resistor element 300 provides a first low resistance, and the first normally closed switch 100 is closed, so that the first branch 1100 forms a closed circuit, and the positive voltage is absorbed by the conducting first diode 400. For example, in this application, we assume that the first diode 400 is a silicon diode, and the voltage drop (i.e., conduction voltage) across the first diode 400 is +0.7V, so the positive voltage (i.e., +3V) is reduced to +0.7V by the conducting first diode 400.

[0039] Those skilled in the art will understand that diodes 400 and 700 are not limited to silicon diodes, and germanium diodes may be used depending on the actual needs. The conduction voltage of a germanium diode is 0.3V, and the reverse voltage of ±3V is reduced to ±0.3V.

[0040] The voltage absorption circuit 1000 uses the second branch 1200 to absorb or reduce the negative voltage of -3V, which is the inverse of the voltage Uin = +12V applied to the electronic lock motor 3000 when it is energized in the forward direction, to -0.7V, thereby significantly reducing the value of the reverse voltage and shortening the length of the lock tongue retraction of the electronic lock motor 3000 caused by the -3V reverse voltage that occurs when the electronic lock motor 3000 becomes de-energized after the charging gun is locked into the charging socket of the electric vehicle, thereby reducing the risk of uncertain locking or, in some cases, unlocking of the charging gun caused by the retraction of the lock tongue.

[0041] Furthermore, the voltage absorption circuit 1000 uses the first branch 1100 to absorb or reduce the positive voltage of +3V, which is the inverse of the voltage Uin = -12V applied to the electronic lock motor 3000 when it is energized in the reverse direction, to +0.7V, which occurs at the moment the electronic lock motor 3000 becomes de-energized by the electronic lock motor 3000, thereby significantly reducing the value of the reverse voltage. This shortens the length of extension of the lock tongue of the electronic lock motor 3000 caused by the +3V reverse voltage that occurs when the electronic lock motor 3000 becomes de-energized after the charging gun is unlocked from the charging socket of the electric vehicle, thereby reducing the risk of incomplete unlocking or, in some cases, failure to unlock the charging gun caused by the protrusion of the lock tongue.

[0042] Referring to Figure 2, the first normally closed switch 100 and the second normally closed switch 500 are configured as single-pole relays, and the first variable resistor element 300 and the second variable resistor element 600 are configured as resettable SMD (surface-mount) fuses. However, this application is not limited to these, and any suitable elements may be selected as needed to perform the functions of the normally closed switches 100, 500 and the variable resistor elements 300, 600.

[0043] Continuing to refer to Figure 2, the first normally closed switch 100, configured as a single-pole relay, comprises a first contact 110 (shown as a single-pole double-throw switch in Figure 2) and a first coil 120 connected in parallel with the electronic lock motor 3000. The anode of the first coil 120 (represented by "+" in Figure 2) acts as a drive terminal 101 by being electrically connected to the anode of the electronic lock motor 3000, thereby driving the first coil 120 and generating a magnetic field when the electronic lock motor 3000 is energized in the positive direction. The cathode of the first coil 120 is electrically connected to the grounded cathode of the electronic lock motor 3000 (represented by the symbol "GND" in Figure 2). The first contact 110 is connected in series with the first variable resistor element 300 and the first diode 400 to form the first branch 1100. The first coil 120 is configured to open the first normally closed switch 100 by generating a magnetic field to open the first contact 110 when the electronic lock motor 3000 is energized in the forward direction, or by disconnecting it from the ground line located on the lower side of Figure 2, and then electrically connecting it to the open line located on the upper side of Figure 2. The first coil 120 is configured to close the first normally closed switch 100 when the electronic lock motor 3000 is energized in the reverse direction and when the electronic lock motor 3000 is de-energized, by not generating a magnetic field (i.e., no magnetic field is generated) and electrically connecting the first contact 110 to the ground line located on the lower side of Figure 2.

[0044] Similarly, the second normally closed switch 500, also configured as a single-pole relay, comprises a second contact 510 (shown as a single-pole double-throw switch in Figure 2) and a second coil 520 connected in parallel with the electronic lock motor 3000. The anode of the second coil 520 (shown by "+" in Figure 2) is electrically connected to the cathode of the grounded electronic lock motor 3000, thereby acting as a drive terminal 501. When the electronic lock motor 3000 is energized in the reverse direction, the second coil 520 is driven and generates a magnetic field. The cathode of the second coil 520 is electrically connected to the anode of the electronic lock motor 3000. The second contact 510 is connected in series with the second variable resistor element 600 and the second diode 700 in that order to form a second branch 1200. The second coil 520 is configured to open the second normally closed switch 500 by generating a magnetic field when the electronic lock motor 3000 is energized in the reverse direction, causing the second contact 510 to open, or by disconnecting it from the ground line located on the lower side of Figure 2 and electrically connecting it to the open line located on the upper side of Figure 2. The second coil 520 is configured to close the second normally closed switch 500 by not generating a magnetic field when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is de-energized, causing the second contact 510 to be electrically connected to the ground line located on the lower side of Figure 2.

[0045] A voltage absorption circuit 2000 according to a second embodiment of this application will be described with reference to Figures 3 and 4. The voltage absorption circuit 2000 includes a third branch 2100 connected in parallel with the electronic lock motor 3000.

[0046] The third branch 2100 comprises a first variable resistor element 300 and a first normally closed switch 200, which are connected in series from top to bottom in the vertical direction of Figure 3. The drive terminal 201 of the first normally closed switch 200 is electrically connected to the anode P of the electronic lock motor 3000.

[0047] Unlike the first normally closed switch 100 in the first embodiment, the second normally closed switch 200 in the second embodiment is configured to open when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is energized in the reverse direction, and to close when the electronic lock motor 3000 is de-energized. That is, the drive terminal 201 drives the first normally closed switch 200 to open regardless of whether the electronic lock motor 3000 is energized in the forward or reverse direction. The first variable resistor element 300 is connected in series with the first normally closed switch 200 and is configured to provide a first high resistance that prevents the electronic lock motor 3000 from short-circuiting due to the first normally closed switch 200 not opening in a timely manner when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is energized in the reverse direction. The first variable resistor element 300 is further configured to provide a first low resistance that can form a short circuit when the electronic lock motor 3000 is de-energized, thereby short-circuiting the reverse voltage (i.e., -3V and +3V) which is the reverse of the voltage applied to the electronic lock motor 3000 when it is energized (i.e., +12V and -12V), generated by the electronic lock motor 3000 at the moment the electronic lock motor 3000 becomes de-energized. In other words, by grounding the third branch 2100 (in Figure 3, grounding is represented by the symbol "GND") (as described below), the reverse voltage is absorbed or reduced to 0V, thereby significantly reducing the value of the reverse voltage. This shortens the length of the retraction of the lock tongue of the electronic lock motor 3000 caused by the -3V reverse voltage that occurs when the electronic lock motor 3000 becomes de-energized after the charging gun is locked into the charging socket of the electric vehicle, thereby reducing the risk of uncertain locking or, in some cases, unlocking of the charging gun caused by the retraction of the lock tongue. It also shortens the length of the protrusion of the lock tongue of the electronic lock motor 3000 caused by the +3V reverse voltage that occurs when the electronic lock motor 3000 becomes de-energized after the charging gun is unlocked from the charging socket of the electric vehicle, thereby reducing the risk of incomplete unlocking or, in some cases, failure to unlock the charging gun caused by the protrusion of the lock tongue.

[0048] In other words, the voltage absorption circuit 2000 is configured to open the first normally closed switch 200 when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is energized in the reverse direction, thereby preventing the electronic lock motor 3000 from short-circuiting by forming an open circuit at the third branch 2100. The negative voltage, which is the opposite of the voltage when energized in the forward direction, and the positive voltage, which is the opposite of the voltage when energized in the reverse direction, are absorbed by the third branch 2100 through a short circuit formed by the first variable resistor element 300 when the electronic lock motor 3000 is de-energized.

[0049] Referring to Figure 4, the first normally closed switch 200 is configured as a non-polarized relay, and the first variable resistor element 300 is configured as a resettable surface-mount fuse. However, this application is not limited to these, and any suitable elements may be selected as needed to perform the functions of the normally closed switch 200 and the variable resistor element 300.

[0050] The first normally closed switch 200, configured as a non-polarized relay, comprises a first contact 210 (shown as a single-pole double-throw switch in Figure 4) and a non-polarized (i.e., without a distinct anode and cathode) first coil 220 connected in parallel to the electronic lock motor 3000 (the electronic lock motor 3000 is not shown in Figure 4 for clarity). One of the cathodes and anodes of the first coil 220 is electrically connected to the anode of the electronic lock motor 3000 (i.e., either end of the first coil 220 can act as an anode), and the other of the cathodes and anodes of the first coil 220 is electrically connected to the grounded cathode of the electronic lock motor 3000 (i.e., either end of the first coil 220 can act as a cathode). The first contact 110 and the first variable resistor element 300 are connected in series to form a third branch 2100. The first coil 120 is configured to open the first normally closed switch 200 by generating a magnetic field to open the first contact 110 when the electronic lock motor 3000 is energized in the forward direction and when the electronic lock motor 3000 is energized in the reverse direction, or by disconnecting it from the ground line located on the lower side of Figure 4 and then electrically connecting it to the open line located on the upper side of Figure 4. When the electronic lock motor 3000 is de-energized, the first coil 120 is configured to generate a no-magnetic field state and close the first normally closed switch 200 by electrically connecting the first contact 210 to the ground line located on the lower side of Figure 4.

[0051] The embodiments of this application have been described in detail with reference to the drawings. It should be noted that any implementations not illustrated or described in the drawings or text of this specification are known to those skilled in the art and will not be described in detail. Furthermore, the above definitions of each component are not limited to the various specific structures, shapes, or styles mentioned in these embodiments, and those skilled in the art can make simple modifications or substitutions.

[0052] Furthermore, it should be noted that in the specific embodiments of this application, the numerical parameters in this specification and the appended claims are approximate and, unless otherwise specified, are modifiable according to the desired characteristics obtained by the subject matter of this application. In detail, all numerical values ​​used in this specification and the claims to express dimensions, ranges, etc., should be understood in all cases to be modified by the term “approximately”. Generally, the expressed meaning of the numerical values ​​is intended to encompass variations of ±10% from a specified quantity in some embodiments, ±5% from a specified quantity in some embodiments, ±1% from a specified quantity in some embodiments, and ±0.5% from a specified quantity in some embodiments.

[0053] Those skilled in the art will understand that various combinations and / or configurations of the features described in the various embodiments and / or claims of this application can be realized even if such combinations and / or configurations are not explicitly described in this application. Specifically, various combinations and / or configurations of the features described in the various embodiments and / or claims of this application can be realized without departing from the spirit and teachings of this application. All such combinations and / or configurations fall within the scope of this application.

[0054] The specific embodiments described above provide a further detailed explanation of the object, technical solution, and beneficial effects of this application. It should be understood that the above description is merely a specific embodiment of this application and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention shall fall within the scope of protection of this application.

Claims

1. A voltage absorption circuit, wherein the voltage absorption circuit is configured to absorb a reverse voltage, which is the reverse of the voltage applied to the device when it is energized, generated at the moment the device becomes de-energized, by a device connected in parallel with the voltage absorption circuit, and the voltage absorption circuit is configured to absorb a reverse voltage, which is the reverse of the voltage applied to the device when it is energized, A first normally closed switch is configured to open when the device is energized and to close when the device is de-energized, A first variable resistor element is connected in series with the first normally closed switch and configured to provide a first high resistance that prevents the device from short-circuiting due to the first normally closed switch not opening in a timely manner when the device is energized, and to provide a first low resistance that allows a short circuit to form when the device is de-energized. A voltage absorption circuit characterized by comprising the following features.

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

3. A first diode, wherein the first diode is connected in series with the first variable resistor element and the first normally closed switch in that order, thereby forming a first branch connected in parallel with the device, 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 element. A second normally closed switch is configured to close when the device is energized in the forward direction and when the device is de-energized, and to open when the device is energized in the reverse direction. A second variable resistor element is connected in series with the second normally closed switch and configured to provide a second high resistance that prevents the device from short-circuiting due to the second normally closed switch not opening in a timely manner when the device is energized in the reverse direction, and to provide a second low resistance that allows a short circuit to form when the device is de-energized. A second diode, wherein the second diode is connected in series with the second variable resistor element and the second normally closed switch in that order, forming a second branch connected in parallel with the device, 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 element. The voltage absorption circuit according to claim 2, further comprising the above.

4. The aforementioned voltage absorption circuit is When the device is energized in the forward direction, the first normally closed switch opens, forming an open circuit at the first branch, and the voltage energized in the forward direction interrupts the second diode in the reverse direction, forming an open circuit at the second branch, thereby preventing the device from short-circuiting. When the device is de-energized, a negative voltage, which is the opposite of the voltage that was energized in the positive direction, blocks the first diode in the reverse direction, forming an open circuit at the first branch, and the negative voltage causes the second diode to conduct in the positive direction, forming a closed circuit at the second branch, thereby absorbing the negative voltage with the conducting second diode. The voltage absorption circuit according to claim 3, characterized in that it is configured in such a way.

5. The aforementioned voltage absorption circuit is When the device is energized in the reverse direction, the second normally closed switch opens, forming an open circuit at the second branch, and the voltage energized in the reverse direction interrupts the first diode in the reverse direction, forming an open circuit at the first branch, thereby preventing the device from short-circuiting. When the device is de-energized, a positive voltage, which is the opposite of the voltage that was energized in the reverse direction, blocks the second diode in the reverse direction, forming an open circuit at the second branch, and the positive voltage causes the first diode to conduct in the positive direction, forming a closed circuit at the first branch, thereby absorbing the positive voltage with the conducting first diode. The voltage absorption circuit according to claim 4, further characterized by being configured as follows.

6. The first normally closed switch comprises a first contact and a first coil connected in parallel with the device, wherein the anode of the first coil is electrically connected to the anode of the device, and the cathode of the first coil is electrically connected to the cathode of the device, and the first contact forms the first branch by being connected in series with the first variable resistor element and the first diode in that order. The first coil is configured to generate a magnetic field and open the first contact when the device is energized in the forward direction, and to close the first contact without generating a magnetic field when the device is energized in the reverse direction and when the device is de-energized. A voltage absorption circuit according to any one of claims 3 to 5, characterized in that

7. The second normally closed switch comprises a second contact and a second coil connected in parallel with the device, wherein the anode of the second coil is electrically connected to the cathode of the device, and the second contact forms the second branch by being connected in series with the second variable resistor and the second diode in that order. The second coil is configured to generate a magnetic field and open the second contact when the device is energized in the reverse direction, and to close the second contact without generating a magnetic field when the device is energized in the forward direction and when the device is de-energized. The voltage absorption circuit according to feature 6.

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 both configured as single-pole relays, and the first variable resistor element and the second variable resistor element are both configured as resettable surface-mount fuses.

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

10. The aforementioned voltage absorption circuit is When the device is energized in the forward direction and when the device is energized in the reverse direction, the first normally closed switch is opened to form an open circuit at the third branch, thereby preventing the device from short-circuiting. When the device is de-energized, the third branch absorbs the negative voltage, which is the opposite of the voltage energized in the positive direction, and the positive voltage, which is the opposite of the voltage energized in the reverse direction, through the short circuit formed by the first variable resistor element. The voltage absorption circuit according to claim 9, characterized in that it is configured in such a way.

11. The first normally closed switch comprises a first contact and a first coil connected in parallel with the device, wherein one of the cathode and anode of the first coil is electrically connected to the anode of the device, the other of the cathode and anode of the first coil is electrically connected to the cathode of the device, and the first contact is connected in series with the first variable resistor element to form the third branch. The first coil is configured to generate a magnetic field to open the first contact when the device is energized in the forward direction and when the device is energized in the reverse direction, and to close the first contact without generating a magnetic field when the device is de-energized. The voltage absorption circuit according to claim 10, characterized in that

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 element is configured as a resettable surface-mount fuse.

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

14. An electronic lock motor, wherein when the electronic lock motor is energized in the forward direction, it drives the lock tongue of the electronic lock to protrude outward to perform a locking function, and when the electronic lock motor is energized in the reverse direction, it drives the lock tongue of the electronic lock to retract inward to perform an unlocking function, and the electronic lock motor is used as a device connected in parallel with the voltage absorption circuit described in any one of claims 1 to 13.

15. An electric vehicle, comprising an electronic lock for locking a charging gun to a charging socket of the electric vehicle, and the electronic lock motor described in claim 14.

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