Automatic unlocking circuit for power failure of electronic lock of charging facility and charging pile

Abstract

The utility model discloses a power-down automatic unlocking circuit of an electronic lock of a charging facility and a charging pile. The power-down automatic unlocking circuit for the electronic lock of the charging facility comprises a first branch circuit, a second branch circuit and a third branch circuit, wherein the first branch circuit is provided with a first input end connected with a power supply and a first output end connected with a first terminal of a driving device of the electronic lock; one end of the second branch is grounded, and the second branch is further provided with a second output end used for being connected with a second terminal of the driving device of the electronic lock; wherein the first branch circuit comprises an electrolytic capacitor charged by the power supply, and the second branch circuit comprises a switch. The power-down automatic unlocking circuit of the electronic lock is simple in structure, low in cost and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric automobile charging device technical field relates to a kind of electronic lock power failure automatic unlocking circuit of charging facility and the charging pile of using the electronic lock power failure automatic unlocking circuit. BACKGROUND

[0002] When user adopts the charging equipment with electronic lock to charge electric automobile, the electronic lock in the charging equipment will automatically switch to locking state, if charging equipment power supply system is suddenly powered off during charging process, at this time, electronic lock will lead to unable to pull out charging gun due to losing power source, thereby causing great trouble. To solve this problem, ensure that charging gun can be pulled out from charging port after power supply system is powered off, there are mainly following two kinds of solutions: one, manually unlocking electronic lock, but since electronic lock is mostly installed in charging equipment, it needs to open cover to charging equipment, and this mode is extremely inconvenient to use. Two, need to switch power supply source to backup power supply, and then unlock electronic lock by internal control logic, and this mode needs to additionally set backup power supply.

[0003] The above information disclosed in the BACKGROUND section is only for the purpose of enhancing the understanding of the background of the present application, and therefore, it can include information that does not constitute the prior art that is known to those of ordinary skill in the art. SUMMARY

[0004] Therefore, the utility model provides a kind of electronic lock power failure automatic unlocking circuit of charging facility, it is simple in structure, relatively low in cost, convenient to use.The utility model also provides a kind of charging pile of using the electronic lock power failure automatic unlocking circuit.

[0005] The utility model adopts following technical solutions:

[0006] A kind of electronic lock power failure automatic unlocking circuit of charging facility, comprising:

[0007] First branch, it has the first input end for connecting power supply and the first output end for connecting the first terminal of the drive device of electronic lock;

[0008] Second branch, one end is grounded, and the second branch also has the second output end for connecting the second terminal of the drive device of electronic lock;

[0009] Wherein, the first branch includes electrolytic capacitor charged by the power supply, and the second branch includes switch.

[0010] In a preferred embodiment, the switch includes a triode, the collector of the triode is connected to the second output end, the emitter of the triode is grounded, and the base of the triode is connected to the power supply.

[0011] In a more preferred embodiment, the switch further comprises a MOS tube, a gate of the MOS tube is connected with a control signal terminal, a source of the MOS tube is grounded, and a drain of the MOS tube is connected with a base of the transistor, and a connection node of the two is connected with a power supply.

[0012] In a further preferred embodiment, the electronic lock power-off automatic unlocking circuit further comprises an optical relay, a light detector of the optical relay is connected between the electrolytic capacitor of the first branch and the first output terminal, a positive electrode of a light emitting diode of the optical relay is connected with the connection node, and a negative electrode of the light emitting diode is grounded.

[0013] In a further preferred embodiment, the gate of the MOS tube is connected with the control signal terminal through a first resistor, the connection node is connected with the power supply through a second resistor, the positive electrode of the diode is connected with the connection node through a third resistor, and the base of the transistor is connected with the connection node through a fifth resistor.

[0014] In a further preferred embodiment, after the control signal terminal outputs a high-level control signal, the electronic lock power-off automatic unlocking circuit is in an automatic unlocking state, in which the MOS tube is in an off state, the transistor is in a conducting state, the optical relay is turned on, and the electrolytic capacitor is in a discharging state to supply power to the driving device of the electronic lock; when the electronic lock power-off automatic unlocking circuit is in a non-working state, the MOS tube is in a conducting state, the transistor is in an off state, the optical relay is in an off state, and the electrolytic capacitor is in a charging state or a floating state charged by the power supply.

[0015] In a preferred embodiment, the electrolytic capacitor is connected with the power supply through a fourth resistor and an anti-reverse diode, and a filter capacitor is connected in parallel on both sides of the electrolytic capacitor.

[0016] In a preferred embodiment, the electronic lock power-off automatic unlocking circuit further comprises a driving chip connected with the power supply, a positive output terminal of the driving chip is connected with the second terminal of the driving device of the electronic lock, and a negative output terminal of the driving chip is connected with the first terminal of the driving device of the electronic lock; and the electrolytic capacitor is an external capacitor on a VM pin of the driving chip.

[0017] In a preferred embodiment, the electronic lock power-off automatic unlocking circuit further comprises an optical relay, a light detector of the optical relay is connected between the electrolytic capacitor of the first branch and the first output terminal, and a light emitting diode of the optical relay is connected with the power supply and controlled by the switch.

[0018] The utility model discloses still adopt following technical scheme:

[0019] A charging pile comprising a charging gun, wherein an electronic lock is arranged on the charging gun, and the charging pile further comprises the electronic lock power-off automatic unlocking circuit.

[0020] In a preferred embodiment, the driving device of the electronic lock comprises a motor, the first output end of the electronic lock automatic circuit is connected to the negative terminal of the motor, and the second output end is connected to the positive terminal of the motor.

[0021] The electronic lock power-off automatic unlocking circuit of the charging facility has the following advantages:

[0022] The electronic lock power-off automatic unlocking circuit of the charging facility has the following advantages:

[0023] Further, the electronic lock power-off automatic unlocking circuit is mainly composed of MOS tubes, anti-reverse diodes, triodes, optical relays and resistors, which are high-reliability and low-cost components, so that the electronic lock power-off automatic unlocking circuit has strong anti-interference ability and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0025] Figure 1 It is a system block diagram of the electronic lock power-off automatic unlocking circuit of the charging pile according to the utility model embodiment.

[0026] Figure 2 It is a circuit diagram of the electronic lock power-off automatic unlocking circuit of the charging pile according to the utility model embodiment.

[0027] Wherein, 1, auxiliary power supply;2, electronic lock power-off automatic unlocking circuit;21, first branch;22, second branch;201, driving IC;202, positive terminal;203, negative terminal;204, connection node. DETAILED DESCRIPTION

[0028] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation on the utility model.

[0029] The embodiment provides an electronic lock power-off automatic unlocking circuit of a charging facility, in particular to an electronic lock power-off automatic unlocking circuit of a charging gun. The charging pile comprises one or more charging guns, and each charging gun is provided with an electronic lock. When the charging gun is inserted into the charging port of the electric vehicle, the electronic lock in the charging gun is automatically switched to the locking state, so that the charging gun is separated from the charging port of the electric vehicle or loosened during the charging process. At the same time, the charging pile also comprises an electronic lock power-off automatic unlocking circuit, which is used for providing power to the driving device of the electronic lock when the power supply is powered off, so that the electronic lock is automatically unlocked, and the problem that the electronic lock cannot be pulled out due to the loss of power source is avoided. Specifically, the driving device of the electronic lock can comprise a motor; the motor is rotated in the forward direction to realize locking, and is rotated in the reverse direction to realize unlocking.

[0030] Referring to Figure 1 When the charging facility works normally, the auxiliary power supply 1 supplies power to the driving IC 201 of the electronic lock, and the electronic lock is normally locked. At the same time, the auxiliary power supply 1 charges the electrolytic capacitor C1. When the auxiliary power supply 1 is powered off, the driving IC 201 loses the power source, and at this time, the energy stored in the electrolytic capacitor C1 is used for unlocking the electronic lock.

[0031] Referring to Figure 2 As shown in the figure, the electronic lock power-off automatic unlocking circuit 2 comprises a first branch 21 and a second branch 22. The first branch 21 has a first input end for connecting the power supply Vcc and a first output end for connecting the first terminal (the negative terminal 203 of the motor M) of the driving device of the electronic lock. One end of the second branch 22 is grounded, and the second branch 22 further has a second output end for connecting the second terminal (the positive terminal 202 of the motor M) of the driving device of the electronic lock. Wherein, the first branch 21 comprises the electrolytic capacitor C1 charged by the power supply Vcc, and the second branch 22 comprises a switch, which switches the on-off of the electrolytic capacitor C1 and the first terminal; the on-off of the second branch 22 is also switched through the switch, which will be described below.

[0032] The switch includes a triode Q1 and a MOS tube Q2. The collector of the triode Q1 is connected to the second output end (the positive terminal 202 of the motor M), the emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected to the power supply V_Backup. In the embodiment, the base of the triode Q1 is first connected to the MOS tube Q2 and then connected to the power supply V_Backup, and the triode Q1 is controlled by the MOS tube Q2 to be turned on or not. Specifically, the gate of the MOS tube Q2 is connected to a control signal terminal Lock_op to access a high-level control signal, the source of the MOS tube Q2 is grounded, and the drain of the MOS tube Q2 is connected to the base of the triode Q1, and the connection node 204 of the two is connected to the power supply V_Backup. When the auxiliary power supply Vcc normally supplies power, the control signal terminal Lock_op driven by the MOS tube Q2 is always supplied with a high-level control signal, so that the MOS tube Q2 is in a continuous conduction state. At this time, the drain of the MOS tube Q2 is always at a low level, the base of the triode Q1 is also pulled to a low level, and the triode Q1 cannot be turned on.

[0033] The electronic lock power-down automatic unlocking circuit further includes an optical relay U1, the optical detector of the optical relay U1 is connected between the electrolytic capacitor C1 of the first branch 21 and the first output end (the negative terminal 203 of the motor M), the positive electrode of the light-emitting diode of the optical relay U1 is connected to the connection node 204, and the negative electrode is grounded. Whether the optical relay U1 is turned on or not is also controlled by the MOS tube Q2.

[0034] Further, the gate of the MOS tube Q2 is connected to the control signal terminal through a first resistor R1. The connection node 204 is connected to the power supply through a second resistor R2. The positive electrode of the diode is connected to the connection node 204 through a third resistor R3. The base of the triode Q1 is connected to the connection node 204 through a fifth resistor R5. The first resistor R1 limits the drive current of the MOS tube Q2, controls the opening speed of the MOS tube Q2, and prevents the MOS tube Q2 from being mistakenly opened. The fifth resistor R5 limits the drive current of the triode Q1 for protecting the triode Q1. After the product is powered down, the current limiting network formed by the second resistor R2 and the fifth resistor R5 ensures that the drive current of the triode Q1 is within a reasonable range, so that the triode Q1 can achieve the effect of saturated conduction.

[0035] The control signal terminal Lock_op outputs a high level control signal to turn off the electronic lock. The automatic unlocking circuit is in the automatic unlocking state. In the automatic unlocking state, the MOS is in the off state, the transistor Q1 is in the on state, the optical relay U1 is on, and the electrolytic capacitor C1 is in the discharge state to supply power to the driving device (motor M) of the electronic lock. When the electronic lock power-off automatic unlocking circuit is in the non-working state, the MOS Q2 is in the on state, the transistor Q1 is in the off state, the optical relay U1 is in the off state, and the electrolytic capacitor C1 is in the charging state or the floating state charged by the power supply Vcc.

[0036] Further, the electrolytic capacitor C1 is connected to the power supply Vcc through a fourth resistor R4 and an anti-reverse diode D1. The two sides of the electrolytic capacitor C1 are connected in parallel with a filter capacitor C1. The anti-reverse diode D1 is used to prevent the energy in the electrolytic capacitor C1 from being consumed by other control systems after power-off.

[0037] The electronic lock power-off automatic unlocking circuit further includes a driving IC 201 (driving chip) connected to the power supply. The positive output terminal of the driving IC 201 is connected to the second terminal (positive terminal 202 of the motor M) of the driving device of the electronic lock, and the negative output terminal of the driving IC 201 is connected to the first terminal (negative terminal 203 of the motor M) of the driving device of the electronic lock. The VM pin of the driving IC 201 is externally connected to the above-mentioned electrolytic capacitor C1.

[0038] Figure 2 The driving IC constitutes a normal driving module of the electronic lock, and the output terminals Out 1 and Out 2 of the driving IC are connected to the positive terminal 202 and the negative terminal 203 of the motor M respectively, and VM is the power supply thereof.

[0039] The electrolytic capacitor C1, the fourth resistor R4 (current limiting resistor) and the anti-reverse diode D1 constitute a charging circuit. The power supply Vcc charges the electrolytic capacitor C1 through the anti-reverse diode D1 and the current limiting resistor R4.

[0040] The second branch 22 and the like constitute a power-off driving module. The input of the MOS Q2 is controlled by the MCU control signal (controlled by the control signal terminal Lock_op). The D pin is directly connected to the electrolytic capacitor C1 through the current limiting resistor R4. After power-off, the MOS Q2 is turned off, the transistor Q1 is saturated and turned on, the collector is connected to the positive terminal 202 of the motor M. At this time, the optical relay U1 is on, the electrolytic capacitor C1 supplies power to the negative terminal 203 of the motor M through the output side of the optical relay U1, and the motor M operates.

[0041] The working process of the embodiment is described as follows:

[0042] First set when the output terminal OUT1, OUT2 of the drive IC output state is 1, 0, the electronic lock, 0, 1, the electronic lock is unlocked;

[0043] When the charging facility (charging pile) works normally, the auxiliary power supply Vcc charges the electrolytic capacitor C1, when the capacitor voltage rises to the auxiliary power supply Vcc voltage (usually +12V), the electrolytic capacitor C1 is in the floating state, the energy stored in the electrolytic capacitor C1 will also be consumed after the electronic lock is normally locked and unlocked, and the charging and floating process will be reentered;

[0044] When the charging facility (charging pile) power supply is abnormal, the entire control system in the charging facility is powered off, at this time the MCU control signal Lock_op is quickly changed from high level to low level, the MOS tube Q2 stops conduction, at this time the D pin of the MOS tube Q2 is changed from low level to high level, the optical relay U1 and the transistor Q1 are turned on, the energy stored in the electrolytic capacitor C1 is directly sent to the negative terminal 203 of the control device (motor M) of the electronic lock through the optical relay U1, and a complete loop is formed through the motor MM and the transistor Q1.

[0045] The embodiment utilizes the power-off of the entire control circuit of the charging facility, the MOS tube Q2 is cut off and the optical relay U1 is turned on, and the energy of the electrolytic capacitor C1 directly drives the electronic lock to realize the automatic unlocking function. Combined with the characteristics that the drive IC (VM pin) of most electronic locks needs to be externally hung with an electrolytic capacitor C1, the electrolytic capacitor C1 is reused, the structure is simple, the cost is low, and in addition to the electrolytic capacitor C1, the MOS tube Q2, the anti-reverse diode D1, the transistor Q1, the optical relay U1, and the resistor used all have the characteristics of high reliability and low cost. The anti-interference ability and reliability of the electronic lock power-off automatic unlocking circuit are high.

[0046] As shown in the specification and claims, the term "comprising" only indicates the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The term "and / or" used herein includes any combination of one or more related listed items.

[0047] It can be further understood that "multiple" in the present disclosure means two or more, and other quantifiers are similar.

[0048] It should be noted that, unless otherwise specified, when a certain feature is referred to as "connected" to another feature, it can be directly connected to the other feature or indirectly connected to the other feature.

[0049] The above embodiment is only for illustrating the technical concept and characteristics of the utility model, is a preferred embodiment, the purpose is that the person skilled in the art can understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent transformation or modification according to the principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. An electronic lock automatic unlocking circuit for a charging facility when power is lost, characterized in that, include: The first branch has a first input terminal for connecting to a power supply and a first output terminal for connecting to a first terminal of a drive device for an electronic lock; The second branch, one end of which is grounded, also has a second output terminal for connecting the second terminal of the drive device of the electronic lock; The first branch includes an electrolytic capacitor charged by the power source, and the second branch includes a switch.

2. The electronic lock automatic unlocking circuit according to claim 1, characterized in that, The switch includes a transistor, the collector of which is connected to the second output terminal, the emitter of which is grounded, and the base of which is connected to a power supply.

3. The electronic lock automatic unlocking circuit according to claim 2, characterized in that, The switch also includes a MOSFET, the gate of which is connected to a control signal terminal and a high-level control signal is applied. The source of the MOSFET is grounded, and the drain of the MOSFET and the base of the transistor are connected together, with their connection node connected to a power supply.

4. The electronic lock automatic unlocking circuit according to claim 3, characterized in that, The electronic lock automatic unlocking circuit after power failure also includes an optical relay. The photodetector of the optical relay is connected between the electrolytic capacitor and the first output terminal of the first branch. The positive terminal of the light-emitting diode of the optical relay is connected to the connection node, and the negative terminal of the light-emitting diode is grounded.

5. The electronic lock automatic unlocking circuit according to claim 4, characterized in that, The gate of the MOS transistor is connected to the control signal terminal through a first resistor; the connection node is connected to the power supply through a second resistor; the anode of the diode is connected to the connection node through a third resistor; and the base of the transistor is connected to the connection node through a fifth resistor.

6. The electronic lock automatic unlocking circuit according to claim 4, characterized in that, After the control signal terminal outputs a high-level control signal, the electronic lock power-off automatic unlocking circuit is in an automatic unlocking state. In the automatic unlocking state, the MOS is in an off state, the transistor is in a conducting state, the photorelay is on, and the electrolytic capacitor is in a discharging state to supply power to the electronic lock's driving device. When the electronic lock's automatic unlocking circuit is not in operation, the MOS transistor is in the on state, the transistor is in the off state, the photorelay is in the off state, and the electrolytic capacitor is in the charging state or floating charging state, which is being charged by the power supply.

7. The electronic lock automatic unlocking circuit according to claim 1, characterized in that, The electrolytic capacitor is connected to the power supply through a fourth resistor and an anti-reverse diode, and a filter capacitor is connected in parallel across the electrolytic capacitor.

8. The electronic lock automatic unlocking circuit according to claim 1, characterized in that, The automatic unlocking circuit for the electronic lock after power failure also includes a driver chip connected to a power source. The positive output terminal of the driver chip is connected to the second terminal of the driving device of the electronic lock, and the negative output terminal of the driver chip is connected to the first terminal of the driving device of the electronic lock. The electrolytic capacitor is an external capacitor on the VM pin of the driver chip.

9. The electronic lock automatic unlocking circuit according to claim 1, characterized in that, The electronic lock automatic unlocking circuit after power failure also includes an optical relay. The photodetector of the optical relay is connected between the electrolytic capacitor of the first branch and the first output terminal. The light-emitting diode of the optical relay is connected to the power supply and controlled to be switched on and off by the switch.

10. A charging station, comprising a charging gun, wherein the charging gun is equipped with an electronic lock, characterized in that, The charging pile also includes an electronic lock automatic unlocking circuit as described in any one of claims 1 to 9; the driving device of the electronic lock includes a motor, the first output terminal of the electronic lock automatic circuit is connected to the negative terminal of the motor, and the second output terminal is connected to the positive terminal of the motor.

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