CN223553090U

CN223553090U - Charging pile power supply circuit based on super capacitor

Info

Publication number: CN223553090U
Application number: CN202422940108.0U
Authority: CN
Inventors: 俞君勇; 吴云江
Original assignee: Hangzhou Chaoxiang Technology Co ltd
Current assignee: Hangzhou Chaoxiang Technology Co ltd
Priority date: 2024-11-29
Filing date: 2024-11-29
Publication date: 2025-11-14
Anticipated expiration: 2034-11-29

Abstract

The utility model provides a super-capacitor-based charging pile power supply circuit which comprises a relay, a power conversion unit, a charging and discharging unit, a control module and a control module, wherein one end of the relay is coupled with an external power supply, the other end of the relay is coupled with a charging plug for controlling the power on-off of the charging plug, the input end of the power conversion unit is coupled with the input end of the external power supply, the output end of the power conversion unit is coupled with the charging and discharging unit for converting the external power supply into a 12V direct current power supply, the charging and discharging unit is respectively coupled with the power conversion unit and the super capacitor and is coupled with the control module through a linear voltage stabilizer for charging or discharging the super capacitor, the control module is coupled with the relay for outputting a control signal to control the opening and closing of the relay, and the super capacitor is used for charging through the charging and discharging of the charging and discharging unit when the external power supply is disconnected. The utility model uses the super capacitor as a standby power supply, and can supply power briefly when the main power supply fails and is powered off until the system reacts and sends out alarm information.

Description

Charging pile power supply circuit based on super capacitor

Technical Field

The utility model relates to the technical field of charging piles, in particular to a charging pile power supply circuit based on a super capacitor.

Background

The charging pile is used as charging equipment of the electric automobile, and the process of safely conveying electric power from the power grid to the electric automobile is realized. Various faults, such as sudden power failure of a power supply, leakage protection tripping caused by insulation faults in the charging process, water leakage and power failure of a box body, and the like, are inevitably encountered in the use process of the charging pile. The general charging pile control system mainly comprises an auxiliary power level, an electric energy metering unit, alternating current and direct current residual current detectors, an isolation monitoring unit, a relay (with a driving function), a data uploading cloud platform service, a user interface and the like. If the input power supply is suddenly powered off, the whole system cannot send any alarm information, the data cannot be uploaded to the cloud platform, the data is in a disconnection offline state, and the data is extremely easy to lose. The equipment cannot upload alarm information to the cloud platform in real time, so that operators cannot maintain the alarm information in real time, and the loss is huge. Therefore, a standby power supply is needed, the charging pile control system can be temporarily maintained to work when the power supply is disconnected, fault information is timely sent to the platform, and an alarm message is generated to inform an operator. Meanwhile, the relay is actively disconnected by the system, so that risks such as battery damage, electrical short circuit or fire disaster are avoided.

The most common standby power supply in the prior art is a battery, and the battery has the advantages of high energy density, long service life, environmental protection and the like as an emergency power supply system, but has higher cost and high safety risk, and the battery may have safety risks such as overheat, short circuit and the like in the charging and discharging processes. But also at extreme temperatures can degrade performance and lifetime.

Disclosure of utility model

Based on the background, the utility model provides a charging pile power supply circuit based on a super capacitor, which uses the super capacitor as a standby power supply, so that a charging pile control system can supply power briefly when a main power supply fails and is powered off until the system reacts and sends out alarm information. The technical scheme is as follows:

A super capacitor-based charging pile power supply circuit, comprising:

One end of the relay is coupled with an external power supply, and the other end of the relay is coupled with the charging plug and is used for controlling the power on-off of the charging plug;

the input end of the power supply conversion unit is coupled with the input end of the external power supply, and the output end of the power supply conversion unit is coupled with the charge-discharge unit and is used for converting the external power supply into a 12V direct current power supply;

The charging and discharging unit is respectively coupled with the power supply conversion unit and the super capacitor, and is coupled with the control module through the linear voltage stabilizer, and is used for charging or discharging the super capacitor;

The control module is coupled with the relay and used for outputting a control signal to control the opening and closing of the relay;

And the super capacitor is used for being charged through the charging and discharging unit when the external power supply is on, and discharging through the charging and discharging unit when the external power supply is off to supply power to the control module.

Further, the power supply control device further comprises a current detector, wherein the input end of the current detector is coupled with the input end of the external power supply, the output end of the current detector is coupled with the control module, and the control module is further used for detecting the voltage of the external power supply through the current detector and sending power supply disconnection information to external equipment when the external power supply is disconnected.

Further, the charge-discharge unit comprises a bidirectional buck-boost converter, an input voltage pin of the bidirectional buck-boost converter is coupled with an output end of the power conversion unit, an output voltage pin is coupled with the control module through the linear voltage stabilizer, a super capacitor pin is coupled with the super capacitor, and a switch pin is coupled with the super capacitor through an inductor.

Furthermore, the super capacitor is formed by connecting a plurality of capacitors in parallel or in series.

Further, the control module comprises an MCU and a wireless communication unit, and the MCU sends information to external equipment through the wireless communication unit.

The beneficial effects of the utility model are as follows:

the utility model provides a charging pile power supply circuit with low cost and small volume, which uses a super capacitor as a standby power supply and combines a bidirectional buck-boost converter to form a novel standby power supply system, when a main power supply fails, the super capacitor can provide power of more than 5W in the period of energy storage release and can maintain the power supply capacity of more than 2 seconds, so that a main control system can report fault information to a cloud platform and cut off a relay to save data states (such as charging information and the like). Because the super capacitor can discharge to 0V, the super capacitor does not need trickle charge or precharge during charging, does not need charging termination, can be continuously topped up, automatically stops charging, does not need to excessively set charging protection, and greatly saves the cost and the efficiency of the design of the charging pile power supply circuit.

Drawings

Fig. 1 is a schematic diagram of circuit composition of an embodiment of a charging pile power supply circuit based on a super capacitor according to the present utility model.

Fig. 2 is a schematic circuit diagram of a charging and discharging unit in an embodiment of a super capacitor-based charging pile power supply circuit according to the present utility model.

Fig. 3 (a) and fig. 3 (b) are schematic diagrams of charge-discharge current flow in an embodiment of the super capacitor-based charging pile power supply circuit of the present utility model.

Detailed Description

Embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the utility model have been illustrated in the accompanying drawings, it is to be understood that the utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the utility model are for illustration purposes only and are not intended to limit the scope of the present utility model.

Referring to fig. 1, the present utility model provides a charging pile power supply circuit based on a super capacitor, mainly focusing on providing a low-cost and small-volume standby power supply system based on the super capacitor, comprising:

One end of the relay is coupled with a 220V alternating current external power supply, and the other end of the relay is coupled with a charging plug and is used for controlling the power on-off of the charging plug;

As a further preferable scheme, the charging pile power supply circuit in this embodiment further includes a current detector, an input end of the current detector is coupled to an external power input end, and an output end of the current detector is coupled to the control module, so that the control module can also detect an external power voltage through the current detector, and send power disconnection information to the external device when the external power is disconnected.

In this embodiment, the power conversion unit is an AC/DC flyback switching power supply, outputs 12V voltage, and supplies power to the entire charging pile control system.

Referring to fig. 2, in the embodiment, the charge-discharge unit includes a bidirectional buck-boost converter (alternatively, TPS 61094) with an input voltage pin VIN coupled to an output terminal of the power conversion unit, an output voltage pin VOUT coupled to the control module via a low dropout linear regulator LDO, a super capacitor pin SUP coupled to the super capacitor, and a switch pin SW coupled to the super capacitor via an inductor.

In the preferred embodiment, the super capacitor is formed by connecting a plurality of capacitors in parallel or in series, and the capacity or voltage level can be adjusted by connecting the capacitors in parallel or in series.

As a preferred embodiment, in this example, the control module includes an MCU and a wireless communication unit, through which the MCU transmits information to an external device. The wireless communication unit may be a 4G, wiFi or bluetooth module.

Referring to fig. 3 (a) and 3 (b), the charging pile power supply circuit in the present embodiment operates as follows:

Under normal state, AC220V power is externally input, 12V voltage is output through the power conversion unit, power is supplied to the whole charging pile control system, and meanwhile, the super capacitor is charged through the charging and discharging unit. After the super capacitor is fully charged, the charging is automatically stopped, and no charging protection is required.

In the power-off state, namely, the externally input AC220V power supply is disconnected, the voltage of the output end of the power supply conversion unit is instantaneously reduced from 12V to 0V. At the moment, the super capacitor can instantly provide a 12V power supply through the charging and discharging unit so as to maintain the work of the control module. At the moment, the control module detects that the input end is in a power-off state through current and voltage detection, and timely reports faults, and the relay is cut off, so that the whole system perception closed loop is realized.

Compared with the prior art, the charging pile power supply circuit provided by the utility model has the following advantages that the super capacitor is used for design:

1) The super capacitor has high energy density and long service life, can store a large amount of electric energy and can release high current rapidly.

2) Compared with the traditional battery, the charging time of the super capacitor is greatly shortened, and the charging can be completed in a few seconds or minutes.

3) The super capacitor has longer service life and stable performance, and the traditional battery has the problems of capacity attenuation and service life loss in the charging and discharging process, and the super capacitor has almost no limitation in the aspect. This means that the supercapacitor can provide a backup power supply more reliably without frequent replacement or maintenance, thereby reducing use costs and human effort.

4) The super capacitor also has good environmental adaptability and high-temperature processing capability, and under extreme environments, such as high-temperature or low-temperature environments, the traditional battery can have performance degradation or failure. The super capacitor can normally work in a wide temperature range, and the reliability of the standby power supply is ensured.

5) The expansibility is strong, and the capacity or voltage level can be adjusted through parallel connection or series connection.

6) The super capacitor has high capacitance and small external size, and the size of the PCB is greatly reduced.

7) The common battery can not be drained, the super capacitor can discharge to 0V, the service life is not influenced, and the electric energy utilization rate is greatly improved.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are within the spirit and principles of the embodiments of the utility model, are intended to be included within the scope of the utility model.

Claims

1. A power supply circuit for a charging pile based on a supercapacitor, characterized in that it comprises:

A relay, with one end coupled to an external power source and the other end coupled to a charging plug, is used to control the power supply to the charging plug.

The power conversion unit has its input terminal coupled to the external power input terminal and its output terminal coupled to the charging and discharging unit, and is used to convert the external power supply into 12V DC power.

The charging and discharging unit is coupled to the power conversion unit and the supercapacitor respectively, and is coupled to the control module via a linear regulator, and is used to charge or discharge the supercapacitor.

A control module, coupled to the relay, is used to output control signals to control the opening and closing of the relay;

And, supercapacitors, which are used to charge through the charging and discharging unit when the external power is connected, and to discharge through the charging and discharging unit to power the control module when the external power is disconnected.

2. The charging pile power supply circuit based on supercapacitor as described in claim 1, characterized in that it further includes a current detector, the input terminal of which is coupled to the input terminal of an external power supply, and the output terminal of which is coupled to a control module. The control module is also used to detect the external power supply voltage through the current detector and send a power disconnection message to the external device when the external power supply is disconnected.

3. The charging pile power supply circuit based on supercapacitor as described in claim 1 or 2, characterized in that the charging and discharging unit includes a bidirectional buck-boost converter, the input voltage pin of the bidirectional buck-boost converter is coupled to the output terminal of the power conversion unit, the output voltage pin is coupled to the control module via a linear regulator, the supercapacitor pin is coupled to the supercapacitor, and the switch pin is coupled to the supercapacitor via an inductor.

4. The charging pile power supply circuit based on supercapacitor as described in claim 3, wherein the supercapacitor is composed of multiple capacitors connected in parallel or in series.

5. The charging pile power supply circuit based on supercapacitor as described in claim 1, wherein the control module includes an MCU and a wireless communication unit, and the MCU sends information to external devices through the wireless communication unit.