Voltage absorption circuit, electronic lock motor and electric automobile

Abstract

The utility model discloses a voltage absorption circuit, an electronic lock motor used together with the voltage absorption circuit and an electric automobile 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] The utility model relates to the field of mechanical electronics, and in particular to a voltage absorption circuit, an electronic lock motor and an electric vehicle. Background Art

[0002] The electronic lock is a crucial component for electric vehicle charging, typically integrated into the charging port as a separate module. It ensures the charging connector is locked during charging, preventing safety issues. The electronic lock's lock tongue extends to lock the charger when the lock is powered forward (i.e., powered off) and retracts to unlock the charger when powered reversely. Because the lock tongue retracts a short distance after the forward power supply (i.e., power is removed) and the voltage generated is opposite to the forward power supply, it fails to extend far enough to securely lock the charger. This can result in the charger being disconnected with even a slight effort during charging, causing charging anomalies. Furthermore, because the lock tongue extends a short distance after the reverse power supply (i.e., power is removed) and the voltage generated is opposite to the reverse power supply, it cannot fully retract, preventing it from fully unlocking the charger.

[0003] Therefore, it is urgent to provide a circuit to absorb the generated reverse voltage so as to firmly lock the charging gun and completely unlock the charging gun. Utility Model Content

[0004] In view of the above problems, the present invention provides a voltage absorption circuit, which is used to absorb a voltage generated by a device connected in parallel with the voltage absorption circuit at the moment when the power is cut off, and the voltage 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, which is configured to be disconnected when the device is powered on and closed when the device is powered off; and a first variable resistance device, which is connected in series with the first normally closed switch and is configured to provide a first high resistance when the device is powered on to prevent the device from being short-circuited due to the failure of the first normally closed switch to be disconnected in time, and to provide a first low resistance that can form a short circuit when the device is powered off.

[0005] According to one aspect of the present invention, the first normally closed switch is configured to be open when the device is forward powered and to be closed when the device is reverse powered and powered off; and the first variable resistance device is configured to provide the first high resistance when the device is forward powered.

[0006] According to one aspect of the present utility model, the voltage absorption circuit also includes: a first diode, which is connected in series with the first variable resistor and the first normally closed switch in sequence to form a first branch in parallel with the device, the positive electrode of the first diode is electrically connected to the positive electrode of the device, and the negative electrode of the first diode is electrically connected to the first variable resistor; a second normally closed switch, which is configured to be closed when the device is forward powered and powered off and to be opened when the device is reverse powered; a second variable resistor, which 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 failure of the second normally closed switch to be opened in time when the device is reverse powered, and to provide a second low resistance that can form a short circuit when the device is powered off; and a second diode, which is connected in series with the second variable resistor and the second normally closed switch in sequence to form a second branch in parallel with the device, the positive electrode of the second diode is electrically connected to the negative electrode of the device, and the negative electrode of the second diode is electrically connected to the second variable resistor.

[0007] According to one aspect of the present invention, the voltage absorption circuit is configured to: when the device is forward-powered, the first branch is opened by disconnecting the first normally closed switch and the second branch is opened by reversely cutting off the second diode by the forward-powered voltage to avoid the device being short-circuited; and when the device is powered off, the first branch is opened by reversely cutting off the first diode by a negative voltage opposite to the forward-powered voltage and the second branch is opened by forward-conducting the second diode by the negative voltage, so that the negative voltage is absorbed by the turned-on second diode.

[0008] According to one aspect of the present invention, the voltage absorption circuit is further configured to: when the device is reverse powered, the second branch is opened by disconnecting the second normally closed switch and the first branch is opened by reversely cutting off the first diode by the reverse power supply voltage to avoid the device being short-circuited; and when the device is powered off, the second branch is opened by reversely cutting off the second diode by a positive voltage opposite to the reverse power supply voltage and the first branch is formed by forward conducting the first diode by the positive voltage, so that the positive voltage is absorbed by the turned-on first diode.

[0009] According to one aspect of the present invention, the first normally closed switch includes a first contact and a first coil connected in parallel with the device, the positive pole of the first coil is electrically connected to the positive pole of the device, the negative pole of the first coil is electrically connected to the negative pole of the device, the first contact is connected in series with the first variable resistor and the first diode in sequence to form the first branch, and wherein the first coil is configured to generate a magnetic field to cause the first contact to open when the device is forward powered and not generate a magnetic field to cause the first contact to close when the device is reverse powered and powered off.

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

[0011] According to one aspect of the present invention, the first normally closed switch and the second normally closed switch are configured as single-pole relays, and the first variable resistance device and the second variable resistance device are configured as recoverable chip fuses.

[0012] According to one aspect of the present invention, the first normally closed switch is configured to be disconnected when the device is forwardly powered and reversely powered, and the first normally closed switch is connected in series with the first variable resistance device to form a third branch connected in parallel with the device.

[0013] According to one aspect of the present invention, the voltage absorption circuit is configured to: when the device is forward-powered and reverse-powered, the first normally-closed switch is disconnected to open the third branch to prevent the device from being short-circuited; and when the device is powered off, a negative voltage opposite to the forward-powered voltage and a positive voltage opposite to the reverse-powered voltage are absorbed by the third branch through the short circuit formed by the first variable resistor device.

[0014] According to one aspect of the present invention, the first normally closed switch includes a first contact and a first coil connected in parallel with the device, either end of the first coil is electrically connected to the positive pole of the device, the other end of the first coil is electrically connected to the negative pole of the device, the first contact and the first variable resistor are connected in series to form the third branch, and wherein the first coil is configured to generate a magnetic field to cause the first contact to open when the device is forwardly powered and reversely powered, and not generate a magnetic field to cause the first contact to close when the device is powered off.

[0015] According to one aspect of the present invention, the first normally closed switch is configured as a non-polarity relay, and the first variable resistance device is configured as a recoverable chip fuse.

[0016] According to one aspect of the present invention, the negative pole 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 lock tongue of the electronic lock to extend to achieve the locking function when powered in the forward direction and to drive the lock tongue of the electronic lock to retract to achieve the unlocking function when powered in the reverse direction. The electronic lock motor is used as a device connected in parallel with the voltage absorption circuit described in any of the above 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 a charging socket of the electric vehicle and the electronic lock motor according to the above aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above contents and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0020] Figure 1 Schematically shows a block diagram of a voltage absorption circuit according to a first embodiment of the present utility model;

[0021] Figure 2 Schematically shows the corresponding Figure 1 The block diagram of the circuit diagram;

[0022] Figure 3 schematically shows a block diagram of a voltage absorption circuit according to a second embodiment of the present utility model; and

[0023] Figure 4 Schematically shows the corresponding Figure 3 The block diagram of the circuit diagram. DETAILED DESCRIPTION

[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 merely exemplary and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion in the concepts of the present invention.

[0025] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the presence of the 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 should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

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

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

[0029] The electronic lock motor 3000 is used to drive the lock tongue 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 socket of the electric vehicle, and to drive the lock tongue 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 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.

[0030] Although the present invention uses the electronic lock motor 3000 as an embodiment of a device used together with the voltage absorption circuit 1000, 2000, those skilled in the art should understand that this is not restrictive, and the voltage absorption circuit 1000, 2000 can also be used together with any other device that needs to eliminate the reverse voltage generated when the power is off.

[0031] The voltage absorption circuit 1000, 2000 is used to absorb the reverse voltage generated by the electronic lock motor 3000 connected in parallel with the voltage absorption circuit 1000, 2000 at the moment of power failure, which is opposite to the voltage Uin (this voltage can also be called input voltage, the value of the input voltage is, for example, ±12V) applied to the electronic lock motor 3000 when the electronic lock motor 3000 is powered. The reverse voltage will cause the electronic lock motor 3000 to produce an action (for example, retraction) opposite to the action (for example, extension) under the voltage Uin, so that the electronic lock motor 3000 cannot lock the charging gun in the charging socket of the electric vehicle.

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

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

[0034] The first branch 1100 includes: Figure 1 The first diode 400, the first variable resistor 300, and the first normally closed switch 100 are connected in series from top to bottom in the vertical direction. The driving end 101 of the first normally closed switch 100 and the positive electrode of the first diode 400 are both electrically connected to the positive electrode P of the electronic lock motor 3000, so that the driving end 101 drives the first normally closed switch 100 to open when the electronic lock motor 3000 is positively powered, and the cathode 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-powered (i.e., the high potential of the voltage Uin applied to the electronic lock motor 3000 is at the positive electrode P of the electronic lock motor 3000, and the low potential of the voltage Uin is at the negative electrode N of the electronic lock motor 3000) and to close when the electronic lock motor 3000 is reverse-powered or de-energized. The first variable resistor 300 is configured to provide a first high resistance when the electronic lock motor 3000 is forward-powered. This first high resistance prevents the electronic lock motor 3000 from short-circuiting due to the first normally closed switch 100 not opening in time when the electronic lock motor 3000 is forward-powered and the first diode 400 is conductive. The first variable resistor 300 is also configured to provide a first low resistance capable of forming a short circuit when the reverse-powered electronic lock motor 3000 is de-energized. The value of the first low resistance can be close to 0Ω or even 0Ω.

[0036] The second branch 1200 includes: Figure 1 The second normally closed switch 500, the second variable resistor 600, and the second diode 700 are connected in series in the vertical direction from top to bottom. The driving end 501 of the second normally closed switch 500 and the positive electrode of the second diode 700 are both electrically connected to the negative electrode N of the electronic lock motor 3000, so that the driving end 501 drives the second normally closed switch 500 to open when the electronic lock motor 3000 is reversely powered, and the negative electrode 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 forward-powered or de-powered, and to open when the electronic lock motor 3000 is reverse-powered (i.e., the low potential of the voltage Uin applied to the electronic lock motor 3000 is at the positive electrode P of the electronic lock motor 3000, and the high potential of the voltage Uin is at the negative electrode 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 reverse-powered. This second high resistance prevents the electronic lock motor 3000 from short-circuiting due to the second normally closed switch 500 not opening in time if the electronic lock motor 3000 is reverse-powered and the second diode 700 is turned on. The second variable resistor 600 is also configured to provide a second low resistance that can form a short circuit when the forward-powered electronic lock motor 3000 is de-powered. The value of the second low resistance can be close to 0Ω or even 0Ω.

[0038] Continue to see Figure 1 , the working principle of the voltage absorption circuit 1000 can be described as follows.

[0039] When the electronic lock motor 3000 is forward powered, the first normally closed switch 100 is disconnected to open the first branch 1100, and the forward power voltage reversely cuts off the second diode 700, thereby opening the second branch 1200, thereby preventing the electronic lock motor 3000 from being short-circuited. When the forward-powered electronic lock motor 3000 is de-energized, a negative voltage in the opposite direction of the forward power voltage Uin is applied to the first branch 1100 to reversely cut off the first diode 400, thereby opening the first branch 1100, and the negative voltage is applied to the second branch 1200 to forward-conduct the second diode 700. 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, thereby forming a path in the second branch 1200, and the negative voltage is absorbed by the conductive second diode 700. For example, in the present invention, assuming that the second diode 700 is a silicon diode, the voltage drop across the second diode 700 when turned on (ie, the conduction voltage) is -0.7V, so the negative voltage (ie, -3V) is reduced to -0.7V by the turned-on second diode 700.

[0040] Furthermore, when the electronic lock motor 3000 is reverse powered, the second normally closed switch 500 is disconnected to open the second branch 1200, and the reverse powered voltage reversely cuts off the first diode 400, thereby opening the first branch 1100, thereby preventing the electronic lock motor 3000 from being short-circuited. When the reverse powered electronic lock motor 3000 is de-energized, a positive voltage in the opposite direction of the reverse powered voltage Uin is applied to the second branch 1200 to reversely cut off the second diode 700, thereby opening the second branch 1200, and the positive voltage is applied to the first branch 1100 to forward conduct the first diode 400. 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, thereby forming a path in the first branch 1100, and the positive voltage is absorbed by the conducting first diode 400. For example, in the present invention, assuming that the first diode 400 is a silicon diode, the voltage drop across the first diode 400 (ie, the conduction voltage) is +0.7V. Therefore, the positive voltage (ie, +3V) is reduced to +0.7V by the conducted first diode 400.

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

[0042] The voltage absorption circuit 1000 absorbs or reduces to -0.7V the negative voltage -3V generated by the electronic lock motor 3000 at the moment of power failure, which is the reverse voltage of the voltage Uin=+12V applied to the electronic lock motor 3000 when the electronic lock motor 3000 is forward powered, 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 is retracted due to the reverse voltage of -3V generated when the electronic lock motor 3000 is powered off after the charging gun is locked in the charging socket of the electric vehicle, thereby reducing the risk of the charging gun being loosely locked or even unlocked due to the retraction of the lock tongue.

[0043] In addition, 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 the electronic lock motor 3000 is reversely powered, to +0.7V through the first branch 1100, thereby greatly reducing the value of the reverse voltage and reducing the length of the lock tongue of the electronic lock motor 3000 extended by the reverse voltage of +3V generated when the electronic lock motor 3000 is powered off after the charging gun is unlocked from the charging socket of the electric vehicle, thereby reducing the risk of incomplete unlocking or even no unlocking of the charging gun due to the extension of the lock tongue.

[0044] See also Figure 2 The first normally closed switch 100 and the second normally closed switch 500 are configured as single-pole relays, and the first varistor 300 and the second varistor 600 are configured as resettable chip fuses. However, the present invention is not limited thereto, and any suitable components can be selected as needed to implement the functions of the normally closed switches 100, 500 and the varistor 300, 600.

[0045] Continue to see Figure 2 The first normally closed switch 100 configured as a single-pole relay includes a first contact 110 ( Figure 2 is shown as a single-pole double-throw switch) and a first coil 120 connected in parallel with the electronic lock motor 3000, the positive pole of the first coil 120 (in Figure 2 The first coil 120 is electrically connected to the positive pole of the electronic lock motor 3000 to serve as the driving end 101, so that when the electronic lock motor 3000 is powered in the positive direction, the first coil 120 is driven to generate a magnetic field. The negative pole of the first coil 120 is electrically connected to the negative pole of the ground of the electronic lock motor 3000 (in the figure, the ground is represented by the symbol "GND"), and 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 powered in the positive direction to cause the first contact 110 to be connected from Figure 2The lower grounded line in the circuit is disconnected to be electrically connected to the upper disconnected line to open the first normally closed switch 100, and no magnetic field is generated when the electronic lock motor 3000 is reversely powered and de-energized to cause the first contact 110 to be electrically connected to the lower grounded line to close the first normally closed switch 100.

[0046] Similarly, the second normally closed switch 500, which is also configured as a single-pole relay, includes a second contact 510 (at Figure 2 is shown as a single-pole double-throw switch) and a second coil 520 connected in parallel with the electronic lock motor 3000, the positive pole of the second coil 520 (in Figure 2 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 reversely powered to cause the second contact 510 to be connected from the ground to the ground. Figure 2 The lower grounded line in the circuit is disconnected to be electrically connected to the upper disconnected line to open the second normally closed switch 500, and no magnetic field is generated when the electronic lock motor 3000 is forward powered and de-energized to cause the second contact 510 to be 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 the second embodiment of the present invention is described as follows: The voltage absorption circuit 2000 includes a third branch 2100 connected in parallel with the electronic lock motor 3000 .

[0048] The third branch 2100 includes: Figure 3 The first variable resistor device 300 and the first normally closed switch 200 are connected in series from top to bottom in the vertical direction. The driving end 201 of the first normally closed switch 200 is electrically connected to the positive electrode 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 be disconnected when the electronic lock motor 3000 is powered both forward and reverse, and to be closed when the electronic lock motor 3000 is powered off, that is, the driving end 201 drives the first normally closed switch 200 to be disconnected regardless of whether the electronic lock motor 3000 is powered both forward and reverse. The first variable resistor device 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 failure of the first normally closed switch 200 to be disconnected in time when the electronic lock motor 3000 is powered on in the forward direction and reverse direction, and to provide a first low resistance capable of forming a short circuit when the electronic lock motor 3000 is powered off, so that the reverse voltage (i.e., -3V and +3V) generated by the electronic lock motor 3000 at the moment of power failure, which is opposite to the voltage (i.e., +12V and -12V) applied to the electronic lock motor 3000 when the electronic lock motor 3000 is powered, is short-circuited, that is, due to the third branch 2100 being grounded (in the figure, the ground is in accordance with The reverse voltage is absorbed or reduced to 0V by the reverse voltage "GND" (as described below), which greatly reduces the value of the reverse voltage. This not only reduces the length of the lock tongue of the electronic lock motor 3000 that is 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 socket of the electric vehicle, and reduces the risk of the charging gun being loosely locked or even unlocked due to the retraction of the lock tongue, but also reduces the length of the lock tongue of the electronic lock motor 3000 that is extended due to the +3V reverse voltage generated when the electronic lock motor 3000 is powered off after the charging gun is unlocked from the charging socket of the electric vehicle, and reduces the risk of the charging gun being incompletely unlocked or even not unlocked due to the extension of the lock tongue.

[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 forward-powered and reverse-powered to avoid the electronic lock motor 3000 being short-circuited; and when the electronic lock motor 3000 is powered off, the negative voltage opposite to the forward-powered voltage and the positive voltage opposite to the reverse-powered voltage are absorbed by the third branch 2100 through the short circuit formed by the first variable resistor device 300.

[0051] See also Figure 4 The first normally closed switch 200 is configured as a non-polarity relay, and the first variable resistor 300 is configured as a resettable chip fuse. However, the present 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-polarity relay includes a first contact 210 ( Figure 4 is shown as a single pole double throw switch) and with the electronic lock motor 3000 (for clarity, Figure 4 The first coil 220 is connected in parallel with the electronic lock motor 3000 (not shown in the figure), and has no polarity (i.e., no difference between positive and negative poles). Either end of the first coil 220 is electrically connected to the positive pole of the electronic lock motor 3000 (i.e., either end of the first coil 220 can be used as the positive pole), and the other end of the first coil 220 is electrically connected to the grounded negative pole of the electronic lock motor 3000 (i.e., either end of the first coil 220 can be used as the negative pole). The first contact 110 and the first variable resistor 300 are connected in series 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 to cause the first contact 110 to Figure 4 The lower grounded line in the circuit is disconnected to be electrically connected to the upper disconnected line to open the first normally closed switch 200, and no magnetic field is generated when the electronic lock motor 3000 is powered off to cause the first contact 210 to be electrically connected to the lower grounded line to close the first normally closed switch 200.

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

[0054] It should also be noted that, in the specific embodiments of the present invention, unless otherwise indicated, the numerical parameters in this specification and the appended claims are approximate values ​​and can vary depending on the desired properties obtained through the content of the present invention. Specifically, all numbers used in the specification and claims to express compositional dimensions, range conditions, etc. should be understood to be modified by the term "about" in all cases. Generally, the meaning of the expression is to include variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments from the specific quantity.

[0055] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of the present invention may be employed 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 solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the scope of protection of the present invention.

Claims

1. A voltage absorption circuit, characterized in that: The voltage absorption circuit is used to absorb a voltage generated by a device connected in parallel with the voltage absorption circuit when the device is powered off, 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 and to close when the device is de-powered; and A first variable resistance device is connected in series with the first normally closed switch and is configured to provide a first high resistance when the device is powered on to prevent the device from being short-circuited due to the first normally closed switch not being disconnected in time, and to provide a first low resistance capable of forming a short circuit when the device is powered off.

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

3. The voltage absorption circuit according to claim 2, characterized in that: Also includes: a first diode, connected in series with the first varistor and the 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 varistor; a second normally closed switch configured to be closed when the device is both forward powered and de-powered and to be open when the device is reverse powered; a second variable resistance device 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 being opened in time when the device is reversely powered, and to provide a second low resistance capable of forming a short circuit when the device is powered off; and A second diode is connected in series with the second variable resistor and the second normally closed switch to form 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.

4. The voltage absorption circuit according to claim 3, characterized in that: The voltage sink circuit is configured to: When the device is forward powered, the first normally closed switch is opened to open the first branch, and the forward powered voltage reversely cuts off the second diode to open the second branch, thereby preventing the device from being short-circuited. as well as When the device is powered off, a negative voltage opposite to the forward power supply voltage is used to reversely cut off the first diode to open the first branch, and the negative voltage is used to forward conduct the second diode to form a path in the second branch, so that the negative voltage is absorbed by the conductive 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 reversely powered, the second normally closed switch is opened to open the second branch, and the reversely powered voltage reversely cuts off the first diode to open the first branch, thereby preventing the device from being short-circuited. as well as When the device is powered off, a positive voltage opposite to the reverse-powered voltage is used to reversely cut off the second diode to open the second branch, and the positive voltage is used to forward conduct the first diode to form a path in the first branch, so that the positive voltage is absorbed by the conductive 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 electrode of the first coil is electrically connected to the positive electrode of the device, the negative electrode of the first coil is electrically connected to the negative electrode of the device, the first contact is sequentially connected in series with the first variable resistor and the first diode to form a first branch, and wherein the first coil is configured to generate a magnetic field to cause the first contact to open when the device is forward powered and not generate a magnetic field to cause the first contact to close when the device is reverse powered and de-powered.

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 electrode of the second coil is electrically connected to the negative electrode of the device, the negative electrode of the second coil is electrically connected to the positive electrode of the device, the second contact is sequentially 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 to cause the second contact to open when the device is reverse powered and not generate a magnetic field to cause the second contact to close when the device is forward powered and de-powered.

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 single-pole relays, and the first varistor device and the second varistor device are configured as resettable chip fuses.

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

10. The voltage absorption circuit according to claim 9, characterized in that: The voltage sink circuit is configured to: When the device is forwardly powered and reversely powered, the first normally closed switch is opened to open the third branch to prevent the device from being short-circuited; as well as When the device is powered off, a negative voltage opposite to the forward power supply voltage and a positive voltage opposite to the reverse power supply voltage are absorbed by the third branch through the short circuit formed by the first variable resistance device.

11. The voltage absorption circuit according to claim 10, wherein: 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 electrode of the device, and the other end of the first coil is electrically connected to the negative electrode of the device, and 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 to cause the first contact to open when the device is forward powered and reverse powered, and not generate a magnetic field to cause the first contact to close when the device is de-powered.

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-polarity relay, and the first variable resistance device is configured as a recoverable chip fuse.

13. The voltage absorption circuit according to any one of claims 1 to 5, 7, and 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 lock tongue of the electronic lock to extend to achieve the locking function when it is powered in the forward direction and to drive the lock tongue of the electronic lock to retract to achieve the unlocking function when it is powered in the reverse direction. 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: It comprises an electronic lock for locking a charging gun in a charging socket of the electric vehicle and an electronic lock motor according to claim 14.

Images