CN219056010U

CN219056010U - Charging pile electronic lock abnormal power failure self-unlocking circuit

Info

Publication number: CN219056010U
Application number: CN202320060574.2U
Authority: CN
Inventors: 万磊; 韦聪
Original assignee: Shanghai Abb Lianzhuang New Energy Technology Co ltd
Current assignee: Shanghai Abb Lianzhuang New Energy Technology Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-05-23
Anticipated expiration: 2033-01-09

Abstract

The application provides a fill electric pile electronic lock unusual power down from unblock circuit, include: the device comprises an AC/DC converter, a DC/DC converter, a control unit, an electronic lock driving circuit, a double-pole double-throw relay, a diode and a backup capacitor; when the control system of the charging pile is in an abnormal power-down state, different working circuits are controlled by adopting the double-pole double-throw relay, the control system can be automatically unlocked without active intervention, the unlocking is performed based on the discharging of the backup capacitor, the circuit structure is simple, and the effect is safe and reliable.

Description

Charging pile electronic lock abnormal power failure self-unlocking circuit

Technical Field

The utility model relates to the technical field of charging piles of electric automobiles, in particular to a self-unlocking circuit for an abnormal power failure of an electronic lock of a charging pile.

Background

When the rated charging current of the electric vehicle power supply equipment (i.e. the charging pile) is greater than 16A, the power supply interface and the vehicle interface should have a holding device (i.e. an electronic locking device). The electronic locking device should lock the vehicle plug before starting the power supply and remain locked throughout the charging process, preventing the energy transmission from being accidentally disconnected. After the energy transmission is finished, the electronic lock can be unlocked. Under the normal working condition, the charging pile can effectively control the locking and unlocking of the electronic locking device.

However, locking and unlocking of the electronic locking device requires that the charging pile control system function properly. When the charging pile loses electricity due to a fault and the charging process is not completed, the charging pile faces the difficulty that the electronic locking device cannot be unlocked.

At present, a passive power-off locking circuit for an electronic locking device of a charging pile of an electric automobile is needed to realize that the electronic locking device can be effectively unlocked under a power-off state of a charging pile control system.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved in the present application is to provide a self-unlocking circuit when the charging pile is powered down, which is used for solving any one of the technical problems in the prior art that the electronic locking device cannot be unlocked and the unlocking is complex when the charging pile is powered down abnormally.

To achieve the above object and other related objects, the present application provides a charging pile electronic lock abnormal power failure self-unlocking circuit, including: the device comprises an AC/DC converter, a DC/DC converter, a control unit, an electronic lock driving circuit, a double-pole double-throw relay, a diode and a backup capacitor; the input end of the AC/DC converter is electrically connected with an external alternating current power supply, and the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the anode of the diode, one end of the coil of the double-pole double-throw relay and the electronic lock driving circuit respectively; the output end of the DC/DC converter is electrically connected with the control unit and supplies power to the control unit; the control unit is electrically connected with and controls the electronic lock driving circuit; the electronic lock driving circuit is electrically connected with a normally open contact of the double-pole double-throw relay; the other end of the coil of the double-pole double-throw relay is grounded; the positive electrode of the backup capacitor is respectively and electrically connected with the negative electrode of the diode and one of the normally-closed contacts of the double-pole double-throw relay; the negative electrode of the backup capacitor is grounded; the other normally closed contact of the double-pole double-throw relay is grounded; the movable contact of the double-pole double-throw relay is electrically connected with the electronic lock.

In an embodiment of the present application, when the external power supply supplies power normally, the power supply supplies power to the coil of the double-pole double-throw relay via the AC/DC converter so that the normally open contact is closed, and the AC/DC converter, the DC/DC converter, the control unit, and the electronic lock driving circuit are electrically connected in sequence to provide conduction of the normally open contact, so as to lock or unlock the electronic lock.

In an embodiment of the present application, when the external power supply supplies power normally, the power supply charges the backup capacitor through the AC/DC converter and the diode.

In an embodiment of the present application, when the external power supply is abnormal, the coil of the double-pole double-throw relay is powered off to close the normally-closed contact and provide conduction of the normally-closed contact; the backup capacitor discharges to unlock the electronic lock.

In an embodiment of the present application, the output end of the AC/DC converter outputs a low-voltage direct-current voltage.

In an embodiment of the present application, the capacitance value of the backup capacitor ranges from 800 μf to 20000 μf.

In one embodiment of the present application, the external ac power source is a 220VAC mains power source.

In an embodiment of the present application, the electronic lock driving circuit includes a brush type dc motor driver.

To sum up, the application provides a fill electric pile electronic lock unusual power down from unblock circuit has following beneficial effect:

when the control system of the charging pile is in an abnormal power-down state, different working circuits are controlled by adopting the double-pole double-throw relay, the control system can be automatically unlocked without active intervention, the unlocking is performed based on the discharging of the backup capacitor, the circuit structure is simple, and the effect is safe and reliable.

Drawings

Fig. 1 is a schematic structural diagram of a self-unlocking circuit for abnormal power failure of an electronic lock of a charging pile in an embodiment of the application.

Detailed Description

Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that, the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

As shown in fig. 1, a schematic structural diagram of a self-unlocking circuit for abnormal power failure of a charging pile electronic lock in an embodiment of the present application is shown, where the self-unlocking circuit for abnormal power failure of the charging pile electronic lock includes: an AC/DC converter 11, a DC/DC converter 12, a control unit 13, an electronic lock driving circuit 14, a double pole double throw relay 15, a diode 16, a backup capacitor 17; wherein, the liquid crystal display device comprises a liquid crystal display device,

the input end of the AC/DC converter 11 is electrically connected to an external AC power supply, and the output end is electrically connected to the input end of the DC/DC converter 12, the positive electrode of the diode 16, one end of the coil of the double-pole double-throw relay 15, and the electronic lock driving circuit 14, respectively; the output end of the DC/DC converter 12 is electrically connected with the control unit 13 and supplies power to the control unit; the control unit 13 is electrically connected with and controls the electronic lock driving circuit 14; the electronic lock driving circuit 14 is electrically connected with a normally open contact of the double-pole double-throw relay 15; the other end of the coil of the double-pole double-throw relay 15 is grounded;

the cathode of the diode 16 is electrically connected with the anode of the backup capacitor 17; the positive electrode of the backup capacitor 17 is also electrically connected with one of the normally-closed contacts of the double-pole double-throw relay 15; the negative electrode of the backup capacitor 17 is grounded; the other normally closed contact of the double-pole double-throw relay 15 is grounded; the movable contact of the double pole double throw relay 15 is electrically connected to the electronic lock 18.

As shown in fig. 1, pins (1) and (3) of the double-pole double-throw relay 15 are normally open contacts, pins (2) and (4) are normally closed contacts, pins (5) and (6) are movable contacts, and a coil is arranged between pins (7) and (8).

In an embodiment of the present application, the external ac power source is a 220VAC mains power source, so that the electric vehicle charging pile works normally.

In an embodiment of the present application, the output end of the AC/DC converter outputs a low-voltage DC voltage, such as 12V.

In an embodiment of the present application, the capacitance range of the backup capacitor is 800 μf to 20000 μf; preferably 2000. Mu.F. As proved by researches and experiments, the capacity value can meet the electric quantity required by unlocking the electronic lock, and the whole circuit is in an intrinsically safe state due to the limited stored energy and lower voltage.

It should be noted that the capacitance value of the backup capacitor may be lower than 800 μf or higher than 20000 μf. However, when the capacitance value of the backup capacitor is higher than 20000 μf, the energy stored in the backup capacitor is too much to exceed the electric quantity required for unlocking the electronic lock, which may cause energy waste; when the capacitance of the backup capacitor is lower than 800 μf, the energy storage may not be sufficient to provide the electric quantity required for unlocking the electronic lock under the condition of high temperature or low temperature. Therefore, the optimum capacitance value of the backup capacitor is in the range of 800 μF to 20000 μF.

In an embodiment of the present application, when the external power supply is powered normally, the power supply supplies power to the coil of the double-pole double-throw relay 15 via the AC/DC converter 11 to close the normally open contact, and the AC/DC converter 11, the DC/DC converter 12, the control unit 13, and the electronic lock driving circuit 14 are electrically connected in sequence to provide conduction of the normally open contact, so as to lock or unlock the electronic lock 18.

In an embodiment of the present application, when the external power supply is powered normally, the power supply also charges the backup capacitor 17 through the AC/DC converter 11 and the diode 16.

In an embodiment of the present application, when the external power supply is abnormal, the coil of the double pole double throw relay 15 is de-energized to close the normally closed contact and provide conduction of the normally closed contact; the backup capacitor 17 discharges to unlock the electronic lock 18.

It should be noted that, the specific working modes of the self-unlocking circuit for the abnormal power failure of the charging pile electronic lock comprise the following two modes:

1) When the external power supply is normal, the input end of the AC/DC converter 11 is electrically connected to an external AC power supply to obtain normal power supply; the output end of the AC/DC converter 11 is electrically connected to the coil of the double-pole double-throw relay 15 and supplies power to the coil so that the normally open contacts are closed (i.e., (1) (5) and (3) (6) are respectively connected), and is also electrically connected to the input end of the DC/DC converter 12 to perform AC/DC conversion, and is also electrically connected to the electronic lock driving circuit 14 and supplies power to the electronic lock driving circuit; the output end of the DC/DC converter 12 is electrically connected with the control unit 13 and supplies power to the control unit; the control unit 13 is electrically connected with and controls the electronic lock driving circuit 14; the electronic lock driving circuit 14 is electrically connected to the normally open contact to form a complete current loop for locking or unlocking the electronic lock 18.

Meanwhile, the output terminal of the AC/DC converter 11 is electrically connected to the diode 16 to charge the backup capacitor 17.

2) When external power supply is abnormal, such as abnormal power failure of an external alternating current power supply, the coil of the double-pole double-throw relay 15 is powered off to close the normally closed contacts, namely (2) (5) and (4) (6) are respectively connected; and the backup capacitor 17 remains charged due to the unidirectional conductivity of the diode 16; the backup capacitor 17 is electrically connected with the normally closed contact to form a "(4) - (6) -electronic lock- (5) - (2)" current loop to unlock the electronic lock 18.

Wherein the backup capacitor 17 provides a limited energy storage and a low voltage, thus providing a safety protection for the whole circuit.

In one embodiment of the present application, the electronic lock driving circuit 14 includes a brush type dc motor driver. For example, a DRV8870 brush dc motor driver may be selected as part of the electronic lock drive circuit 14 to lock or unlock the electronic lock 18 when external power is normal. The DRV8870 device provides comprehensive protection against circuit failures and short circuit problems, including under-voltage lockout (UVLO), over-current protection (OCP), and over-temperature protection (TSD).

To sum up, the application provides a fill electric pile electronic lock unusual power failure from unblock circuit, when filling electric pile's control system when being in unusual power failure state, through adopting double-pole double-throw relay to control different work circuits, need not control system's initiative to intervene and can unlock automatically, unblock based on the discharge of backup capacitor, circuit structure is simple, effect safe and reliable.

In summary, the present application effectively overcomes the various drawbacks of the prior art and has high industrial utility value.

The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application.

Claims

1. Charging pile electronic lock is unusual to fall power from unblock circuit, its characterized in that includes: the device comprises an AC/DC converter, a DC/DC converter, a control unit, an electronic lock driving circuit, a double-pole double-throw relay, a diode and a backup capacitor; the input end of the AC/DC converter is electrically connected with an external alternating current power supply, and the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the anode of the diode, one end of the coil of the double-pole double-throw relay and the electronic lock driving circuit respectively; the output end of the DC/DC converter is electrically connected with the control unit and supplies power to the control unit; the control unit is electrically connected with and controls the electronic lock driving circuit; the electronic lock driving circuit is electrically connected with a normally open contact of the double-pole double-throw relay;

the other end of the coil of the double-pole double-throw relay is grounded;

the positive electrode of the backup capacitor is respectively and electrically connected with the negative electrode of the diode and one of the normally-closed contacts of the double-pole double-throw relay; the negative electrode of the backup capacitor is grounded; the other normally closed contact of the double-pole double-throw relay is grounded; the movable contact of the double-pole double-throw relay is electrically connected with the electronic lock.

2. The electric pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein when an external power supply is normal, the power supply supplies power to the coil of the double-pole double-throw relay through the AC/DC converter to enable the normally open contact to be closed, and the AC/DC converter, the DC/DC converter, the control unit and the electronic lock driving circuit are electrically connected in sequence to provide conduction of the normally open contact so as to lock or unlock the electronic lock.

3. The electric pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein when an external power supply is powered normally, the power supply charges the backup capacitor through the AC/DC converter and the diode.

4. The charging pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein when an external power supply is abnormal, a coil of the double-pole double-throw relay is powered off to close the normally-closed contact and provide conduction of the normally-closed contact; the backup capacitor discharges to unlock the electronic lock.

5. The charging pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein the output end of the AC/DC converter outputs a low-voltage direct-current voltage.

6. The charging pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein the capacitance range of the backup capacitor is 800-20000 muf.

7. The charging pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein the external ac power supply is a 220VAC mains power supply.

8. The charging pile electronic lock abnormal power failure self-unlocking circuit according to claim 1, wherein the electronic lock driving circuit comprises a brush type direct current motor driver.