A power-off electronic locking device automatic unlocking circuit for a charging pile

Abstract

The application relates to the field of charging piles, in particular to an automatic unlocking circuit of a power-off electronic locking device of a charging pile, which comprises a boosting module, a capacitor module, a switch module and an electronic locking device, the boosting module is electrically connected to an external power supply, the boosting module is used for increasing the input voltage of the external power supply, the capacitor module is used for storing the electric energy of the external power supply, and the switch module is used for electrically connecting the capacitor module to the boosting module or the electronic locking device. The application has the effect that the electronic locking device can be automatically unlocked after the power supply of the charging pile is cut off.

Description

Technical Field

[0001] This application relates to the field of charging piles, and in particular to an automatic unlocking circuit for an electronic locking device of a charging pile in the event of a power failure. Background Technology

[0002] For charging stations with high charging current, electronic locking devices are typically installed to lock the charging gun, ensuring a stable connection between the charging station and the electric vehicle's charging interface during charging. The electronic locking device requires control and power supply to unlock after charging is complete.

[0003] In existing related technologies, to ensure that the electronic locking device can still unlock after a power outage in the charging pile, an unlocking device is installed inside the charging pile. After a power outage, the unlocking device supplies power to the electronic locking device through a backup capacitor charged by an external power source with the same threshold voltage as the electronic locking device, thereby unlocking the electronic locking device. Specifically, refer to the utility model patent with publication number CN 219056010 U, entitled "A Self-Unlocking Circuit for Abnormal Power Loss of Electronic Lock in Charging Pile".

[0004] Regarding the aforementioned technologies, the high operating temperature of the charging pile reduces the capacity of the backup capacitor, and multiple components consume the energy stored in the backup capacitor after the charging pile is powered off. As a result, the discharge voltage of the backup capacitor often cannot reach the threshold voltage of the electronic locking device, making it easy for the charging pile to experience a problem where the discharge voltage of the backup capacitor is insufficient to enable the electronic locking device to unlock itself. Summary of the Invention

[0005] In order to enable the electronic locking device to unlock itself after the charging pile is powered off, this application provides an automatic unlocking circuit for the electronic locking device of the charging pile when the power is off.

[0006] The automatic unlocking circuit for a charging pile electronic locking device in the event of power failure provided in this application adopts the following technical solution: An automatic unlocking circuit for an electronic locking device of a charging pile after power failure includes a boost module, a capacitor module, a switch module, and an electronic locking device. The boost module is electrically connected to an external power source and is used to increase the input voltage of the external power source. The capacitor module is used to store the electrical energy of the external power source. The switch module is used to connect the capacitor module to the boost module or the electronic locking device.

[0007] By adopting the above technical solution, the external power supply is boosted by the boost module to charge the capacitor module, so that the charging voltage of the capacitor module exceeds the threshold voltage of the electronic locking device. This ensures that the discharge voltage of the capacitor module can meet the threshold voltage of different application environments or different models of electronic locking devices, so that the electronic lock can unlock itself after the charging pile is powered off, thereby ensuring the applicability of the automatic unlocking circuit of the electronic locking device of the charging pile when the power is off.

[0008] Optionally, a current limiting module is provided between the boost module and the capacitor module, and the current limiting module is used to reduce the charging current of the capacitor module.

[0009] By adopting the above technical solution, the current limiting module reduces the instantaneous excessive current generated by the automatic unlocking circuit of the charging pile's power-off electronic locking device under the action of the external power supply when the capacitor module is connected to the external power supply. This makes the capacitor module less susceptible to damage due to excessive charging current, and also makes the switching module less susceptible to damage due to excessive current.

[0010] Optionally, the current limiting module includes a soft-start resistor R1.

[0011] By adopting the above technical solution, the soft-start resistor R1 limits the current between the boost module and the capacitor module, reducing the current flowing to the capacitor module, thereby making the switching module less susceptible to damage due to excessive current.

[0012] Optionally, the switch module is electrically connected to an external power source. When the switch module is powered on, the capacitor module is electrically connected to an external power source. When the switch module is powered off, the capacitor module is electrically connected to an electronic locking device.

[0013] By adopting the above technical solution, when the external power supply is not disconnected during normal operation of the charging pile, the external power supply is electrically connected to the capacitor module through the boost module, thereby charging the capacitor module; when the external power supply is disconnected due to a charging pile malfunction, the capacitor module discharges to supply power to the electronic locking device, thereby enabling the electronic locking device to unlock when the charging pile malfunctions.

[0014] Optionally, the switching module includes a double-pole double-throw relay LS1, the normally open contact of which is electrically connected to an electronic locking device, one normally closed contact of which is electrically connected to an external power supply, and the other normally closed contact of which is grounded.

[0015] By adopting the above technical solution, the electronic locking device and the bidirectional TVS tube D3 are in an isolated state when the external power supply is not disconnected during normal operation of the charging pile, and are not likely to interfere with the electronic locking device when the charging pile is working normally.

[0016] Optionally, the switching module further includes a freewheeling diode D2, which is connected in parallel to the coil of the double-pole double-throw relay LS1.

[0017] By adopting the above technical solution, when the external power supply of the charging pile is disconnected due to a fault, the freewheeling diode D2 provides freewheeling current to the coil of the double-pole double-throw relay LS1, which helps to reduce the adverse effects of the back electromotive force generated by the coil on other components.

[0018] Optionally, the capacitor module includes a backup capacitor C5 and a backup capacitor C6, wherein the backup capacitor C5 and the backup capacitor C6 are connected in parallel.

[0019] By adopting the above technical solution, it is beneficial to reduce the occurrence of situations where the electronic locking device cannot be unlocked due to backup capacitor failure.

[0020] Optionally, the electronic locking device is provided with a bidirectional TVS tube D3 in parallel.

[0021] By adopting the above technical solution, after the charging pile fails and loses power, the capacitor module discharges to supply power to the electronic locking device. When the boost module fails and causes the electronic locking device to be overloaded by an excessive voltage, the bidirectional TVS diode D3 conducts, causing the electronic locking device to be short-circuited by the bidirectional TVS diode D3, thereby making the electronic locking device less likely to be damaged by excessive voltage.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. After the external power supply is boosted by the boost module, it charges the capacitor module so that the charging voltage of the capacitor module exceeds the threshold voltage of the electronic locking device. This ensures that the discharge voltage of the capacitor module can meet the threshold voltage of different application environments or different models of electronic locking devices, so that the electronic locking can unlock itself after the charging pile is powered off. This ensures the applicability of the automatic unlocking circuit of the electronic locking device when the charging pile is powered off. 2. The current limiting module reduces the instantaneous excessive current generated by the automatic unlocking circuit of the charging pile's electronic locking device when the capacitor module is connected to an external power source, thus making the switching module less susceptible to damage due to excessive current. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the circuit structure of the double-pole double-throw relay LS1 when it is energized according to an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the circuit structure of the double-pole double-throw relay LS1 when it is de-energized according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached diagram: 1. Boost module; 2. Capacitor module; 3. Switch module; 4. Electronic locking device. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0027] This application discloses an automatic unlocking circuit for a charging pile's electronic locking device in the event of a power failure. (Refer to...) Figure 1 The automatic unlocking circuit of the charging pile's electronic locking device when the power is off includes a boost module 1, a capacitor module 2, a switch module 3, and an electronic locking device 4.

[0028] Reference Figure 1 The external power supply is a 12V DC input, and the threshold voltage of the electronic locking device 4 is greater than 9V and less than 16V. The boost module 1 includes a boost chip and a corresponding standard circuit. The boost chip is used to increase the input voltage of the external power supply; the boost chip model can be HX3608 or MT3608. The input terminal of the boost module 1 is electrically connected to the external power supply, and the external power supply generates a 16V voltage at the output terminal of the boost module 1 through the boost module 1.

[0029] The output terminal of the boost module 1 is electrically connected to a current limiting module, which is used to reduce the current output by the boost module 1. In this embodiment, the current limiting module includes a soft-start resistor R1, the positive terminal of which is electrically connected to the output terminal of the boost module 1. This is to reduce the excessive current instantaneously generated by the automatic unlocking circuit of the charging pile's power-off electronic locking device when connected to an external power source, thereby preventing the capacitor module 2 from being damaged by excessive charging current and reducing the likelihood of damage to the switching module 3, especially the switching module 3 equipped with a relay.

[0030] Reference Figure 1 The capacitor module 2 is used to store electrical energy from an external power source, and the capacitor module 2 includes several capacitors connected in parallel so that when the charging pile is powered off, the electrical energy stored in the capacitors of the capacitor module 2 can power the electronic locking device 4 so that the electronic locking device 4 can unlock itself.

[0031] Specifically, in this embodiment, the capacitor module 2 includes a backup capacitor C5 and a backup capacitor C6, which are connected in parallel. Furthermore, the positive terminal of the backup capacitor C5 is electrically connected to the positive terminal of the backup capacitor C6, and the negative terminals of both the backup capacitor C5 and the backup capacitor C6 are grounded, so as to facilitate charging through the positive terminals of either the backup capacitor C5 or the backup capacitor C6.

[0032] Reference Figure 1The switch module 3 is used to electrically connect the capacitor module 2 to an external power source or the electronic locking device 4. When the capacitor module 2 is electrically connected to an external power source, the backup capacitor C5 and the backup power source C6 are charged through the positive terminals of the backup capacitor C5 and the backup power source C6. Alternatively, when the capacitor module 2 is electrically connected to the electronic locking device 4, the backup capacitor C5 and / or the backup capacitor C6 are discharged to power the electronic locking device 4. This allows the electronic locking device 4 to unlock when the charging station is powered off, using the power supplied by the backup capacitor C5 and / or the backup capacitor C6.

[0033] Reference Figure 1 The switching module 3 includes a double-pole double-throw relay LS1 and a freewheeling diode D2. The normally open contact of the double-pole double-throw relay LS1 is electrically connected to the electronic locking device 4. One normally closed contact of the double-pole double-throw relay LS1 is electrically connected to an external power supply, and the other normally closed contact of the double-pole double-throw relay LS1 is grounded. Specifically, in this embodiment, the stationary contact of the double-pole double-throw relay LS1 is electrically connected to an external power supply, the stationary contact of the double-pole double-throw relay LS1 is grounded, the stationary contact of the double-pole double-throw relay LS1 is electrically connected to the positive and negative terminals of the electronic locking device 4, the output terminal of the moving contact of the double-pole double-throw relay LS1 is electrically connected to the positive terminal of the backup capacitor C5 and the positive terminal of the backup power supply C6, and the output terminal of the moving contact of the double-pole double-throw relay LS1 is grounded.

[0034] Reference Figure 1 When the switch module 3 is powered on, the input terminal of the moving contact of the double-pole double-throw relay LS1 is connected to its own stationary contact, and the input terminal of the moving contact of the double-pole double-throw relay LS1 is connected to its own stationary contact, so that the capacitor module 2 is electrically connected to the external power supply. As a result, the current passing through the boost module 1, after flowing through the soft-start resistor R1, charges the backup capacitor C5 and the backup power supply C6 through the positive terminal of the backup capacitor C5 and the backup power supply C6, so that the charging voltage of the backup capacitor C5 and the backup power supply C6 are close to the voltage of the output terminal of the boost module 1.

[0035] Reference Figure 2 When the switch module 3 is de-energized, the input terminal of the moving contact of the double-pole double-throw relay LS1 is connected to its stationary contact, and the positive terminals of the backup capacitor C5 and the backup power supply C6 are connected to the positive terminal of the electronic locking device 4, and the negative terminal of the electronic locking device 4 is grounded. Thus, the electronic locking device 4 is powered by the electrical energy stored in the external power supply through the backup capacitor C5 and the backup power supply C6, thereby enabling the electronic locking device 4 to unlock itself when the charging pile fails and loses power.

[0036] Reference Figure 1The positive terminal of the coil of the double-pole double-throw relay LS1 is electrically connected to an external power source, and the negative terminal of the coil is grounded, so that the switching module 3 is synchronously powered on or off with the charging pile. A freewheeling diode D2 is connected in parallel to the coil of the double-pole double-throw relay LS1, with its anode connected to the negative terminal of the coil and its cathode connected to the anode of the coil. This allows the freewheeling diode D2 to form a closed loop to dissipate the stored energy in the coil when a high back electromotive force is generated due to power failure, reducing the damage to other electronic components electrically connected to the coil caused by the high back electromotive force.

[0037] Reference Figure 1 The electronic locking device 4 is equipped with a bidirectional TVS diode D3 connected in parallel. One end of the bidirectional TVS diode D3 is connected to both the positive terminal of the electronic locking device 4 and the stationary contact of the double-pole double-throw relay LS1, while the other end is connected to both the negative terminal of the electronic locking device 4 and the stationary contact of the double-pole double-throw relay LS1. When the boost module 1 malfunctions, causing the output voltage of the boost module 1 to be too high (specifically, exceeding 16.5V in this embodiment), the bidirectional TVS diode D3 conducts, and the discharge current forms a loop through the bidirectional TVS diode D3, making the electronic locking device 4 less susceptible to damage from discharge voltages far exceeding the threshold voltage. When the boost module 1 resumes normal operation, causing the output voltage of the boost module 1 to return to normal (specifically, below or equal to 16.5V in this embodiment), the bidirectional TVS diode D3 is turned off, thereby enabling the electronic locking device 4 to self-unlock.

[0038] The implementation principle of the automatic unlocking circuit of the charging pile power failure electronic lock device in this application embodiment is as follows: the external power supply is boosted to 16V by the boost module 1 and then charged to the capacitor module 2, which has a threshold voltage greater than 9V and less than 16V. This makes the charging voltage of the capacitor module 2 exceed the threshold voltage of the electronic lock device 4, thereby ensuring that the discharge voltage of the capacitor module 2 can meet the threshold voltage of different application environments or different models of electronic lock devices 4. This allows the electronic lock to unlock itself after the charging pile is powered off, thus ensuring the applicability of the automatic unlocking circuit of the charging pile power failure electronic lock device.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic unlocking circuit for a charging pile's electronic locking device in the event of a power failure, characterized in that: The system includes a boost module (1), a capacitor module (2), a switch module (3), and an electronic locking device (4). The boost module (1) is electrically connected to an external power source and is used to increase the input voltage of the external power source. The capacitor module (2) is used to store the electrical energy of the external power source. The switch module (3) is used to connect the capacitor module (2) to the boost module (1) or the electronic locking device (4).

2. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 1, characterized in that: A current limiting module is provided between the boost module (1) and the capacitor module (2), and the current limiting module is used to reduce the charging current of the capacitor module (2).

3. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 2, characterized in that: The current limiting module includes a soft-start resistor R1.

4. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 1, characterized in that: The switch module (3) is electrically connected to an external power source. When the switch module (3) is powered on, the capacitor module (2) is electrically connected to an external power source. When the switch module (3) is powered off, the capacitor module (2) is electrically connected to an electronic locking device (4).

5. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 4, characterized in that: The switch module (3) includes a double-pole double-throw relay LS1. The normally open contact of the double-pole double-throw relay LS1 is electrically connected to the electronic locking device (4). One normally closed contact of the double-pole double-throw relay LS1 is electrically connected to an external power source. The other normally closed contact of the double-pole double-throw relay LS1 is grounded.

6. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 5, characterized in that: The switching module (3) also includes a freewheeling diode D2, which is connected in parallel to the coil of the double-pole double-throw relay LS1.

7. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 1, characterized in that: The capacitor module (2) includes a backup capacitor C5 and a backup capacitor C6, which are connected in parallel.

8. The automatic unlocking circuit of the charging pile power failure electronic locking device according to claim 1, characterized in that: The electronic locking device (4) is equipped with a bidirectional TVS tube D3 in parallel.

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