Emergency stop forced stop circuit of alternating current charging pile

Abstract

The utility model relates to the technical field of electric power control, in particular to a sudden stop forced stop circuit of an alternating current charging pile, which comprises a sudden stop button interface circuit used for being connected with a sudden stop button and inputting a sudden stop trigger signal, and the sudden stop button interface circuit comprises a CON16 terminal connected with the sudden stop button; the driving signal forced blocking circuit is connected with the CON16 terminal and a relay driving control end, and is used for forcibly cutting off a driving signal of the relay when the sudden stop is triggered; and the relay control and protection circuit comprises at least one relay, a control coil of the relay is connected with the driving signal forced blocking circuit, and a main contact of the relay is used for cutting off a power output line of the alternating current charging pile. According to the utility model, the first diode D14 and the second diode D15 are adopted to directly pull down a relay driving signal, even if the controller fails, the relay can still be forcibly disconnected through a hardware circuit, so that electric power output is ensured to be cut off instantly, and potential safety hazards are eliminated.

Description

Technical Field

[0001] This utility model relates to the field of power control technology, specifically to an emergency stop circuit for an AC charging pile. Background Technology

[0002] With the increasing popularity of electric vehicles, the safety performance of AC charging stations, as core charging facilities, is of paramount importance.

[0003] Traditional emergency stop circuits rely on the controller to disconnect the relay after receiving an emergency stop signal. However, the controller is susceptible to electromagnetic interference, power fluctuations, and other factors, which may lead to program malfunctions, system crashes, or hardware damage. If the controller fails, the emergency stop signal cannot trigger the relay to disconnect, and power output continues, potentially causing serious safety accidents such as battery overheating, short circuit fires, and electric shocks, threatening users' lives and property and hindering industry development. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the purpose of this invention is to provide an emergency stop circuit for AC charging piles to improve their safety performance.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] An emergency stop circuit for an AC charging station includes:

[0007] An emergency stop button interface circuit is used to connect an emergency stop button and input an emergency stop trigger signal. The emergency stop button interface circuit includes a CON16 terminal connected to the emergency stop button.

[0008] A drive signal forced blocking circuit is connected to the CON16 terminal and the relay drive control terminal, and is used to forcibly cut off the relay drive signal when an emergency stop is triggered.

[0009] A relay control and protection circuit includes at least one relay, the control coil of which is connected to the drive signal forced blocking circuit, and the main contacts of which are used to cut off the power output line of the AC charging pile.

[0010] A signal feedback notification circuit, connected to the CON16 terminal and the controller, is used to send an emergency stop feedback signal to the controller when an emergency stop is triggered.

[0011] In some embodiments of this utility model, the drive signal forced blocking circuit includes a first diode D14 and a second diode D15. The anode of the first diode D14 is connected to the emergency stop trigger terminal of the CON16 terminal, and the cathode is connected to pin 1 of the relay driver chip U4.

[0012] The anode of the second diode D15 is connected to the emergency stop trigger terminal of CON16, and the cathode is connected to pin 2 of U4.

[0013] In some embodiments of this utility model, pins 1 and 2 of U4 are relay drive signal output terminals, used to provide drive voltage to the control coil of the relay, and the first diode D14 and the second diode D15 are used to pull the voltage of pins 1 and 2 of U4 down to the cutoff state when an emergency stop is triggered.

[0014] In some embodiments of this utility model, the relay control and protection circuit includes a first relay RL1 and a second relay REL1. The control coils of the first relay RL1 and the second relay REL1 are both connected to the drive signal forced blocking circuit. The main contacts of the first relay RL1 and the second relay REL1 are connected in series in the phase line and neutral line output circuit of the AC charging pile.

[0015] In some embodiments of this utility model, the signal feedback notification circuit includes a feedback resistor R24. One end of R24 is connected to the emergency stop feedback terminal of the CON16 terminal, and the other end is connected to the STOP signal input terminal of the controller. It is used to pull the STOP signal low through R24 and transmit it to the controller when the emergency stop is triggered.

[0016] In some embodiments of this utility model, the relay control and protection circuit further includes a freewheeling diode D16, which is connected in parallel with the control coil of the relay to suppress the back electromotive force when the relay is disconnected.

[0017] In some embodiments of this utility model, the CON16 terminal of the emergency stop button interface circuit includes a positive power input terminal, a negative power input terminal, and an emergency stop signal output terminal. The emergency stop signal output terminal is connected to the drive signal forced blocking circuit and the signal feedback notification circuit.

[0018] In some embodiments of this utility model, filter capacitors C40 and C41 are further provided between the drive signal forced blocking circuit and the relay control coil. C40 and C41 are connected in parallel across the power supply terminals of the control coil to stabilize the power supply voltage of the control coil.

[0019] In some embodiments of this utility model, after receiving the STOP signal, the controller is configured to stop sending drive signals to the relay control and protection circuit, and to perform emergency stop event recording and system status monitoring.

[0020] In some embodiments of this utility model, the drive signal forced blocking circuit is set independently of the controller. When the controller malfunctions, crashes, or suffers hardware damage, the drive signal forced blocking circuit can still directly cut off the drive signal of the relay through the emergency stop button trigger signal.

[0021] The beneficial effects of this utility model are:

[0022] Compared to traditional methods, this technical solution uses the first diode D14 and the second diode D15 to directly pull the relay drive signal low. Even if the controller fails, the relay can still be forcibly disconnected through the hardware circuit to ensure that the power output is cut off in time and eliminate safety hazards. The emergency stop signal is fed back to the controller through the resistor R24 ​​to trigger event recording, system monitoring and control signal locking, avoid misoperation, improve system coordination and greatly improve system reliability. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is the circuit structure diagram of this utility model. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0026] like Figure 1 As shown, an emergency stop circuit for an AC charging pile is mainly used to quickly cut off the power output of the AC charging pile in emergency situations to ensure the safety of personnel and equipment. The circuit mainly consists of an emergency stop button interface circuit, a drive signal forced blocking circuit, a relay control and protection circuit, and a signal feedback notification circuit.

[0027] The following will be combined with the appendix Figure 1 A detailed description of the specific structure, working principle, and function of each component of each circuit section:

[0028] Emergency stop button interface circuit:

[0029] The main function of the emergency stop button interface circuit is to connect the emergency stop button and input the emergency stop trigger signal to subsequent circuits. This circuit includes a CON16 terminal, which is the key interface for connecting the emergency stop button to other circuits.

[0030] The CON16 terminal has a positive power input, a negative power input, and an emergency stop signal output. The positive and negative power inputs provide the power required for the emergency stop button to operate. When the emergency stop button is pressed, the emergency stop signal output will output an emergency stop trigger signal, which will be simultaneously transmitted to the drive signal forced blocking circuit and the signal feedback notification circuit.

[0031] It should be noted that in practical applications, the design of the CON16 terminal ensures a reliable connection between the emergency stop button and the circuit, and its standardized interface facilitates adaptation to different types of emergency stop buttons.

[0032] Drive signal forced blocking circuit:

[0033] The drive signal forced blocking circuit is connected to the CON16 terminal and the relay drive control terminal. Its core function is to forcibly cut off the relay drive signal when an emergency stop is triggered. This circuit mainly consists of a first diode D14 and a second diode D15.

[0034] In this configuration, the anode of the first diode D14 is connected to the emergency stop trigger terminal of CON16, and the cathode is connected to pin 1 of the relay driver chip U4. Similarly, the anode of the second diode D15 is connected to the emergency stop trigger terminal of CON16, and the cathode is connected to pin 2 of U4. Pins 1 and 2 of U4 are the relay drive signal output terminals. During normal operation, pins 1 and 2 of U4 provide drive voltage to the control coil of the relay, keeping the main contacts of the relay closed, thereby ensuring the power output of the AC charging pile.

[0035] When the emergency stop button is pressed, the CON16 terminal outputs an emergency stop trigger signal, causing the first diode D14 and the second diode D15 to conduct. Due to the diodes' conduction characteristics, the voltage at pins 1 and 2 of U4 is rapidly pulled down to the cutoff state, preventing U4 from providing drive voltage to the relay's control coil. This effectively cuts off the relay drive signal upon emergency stop triggering. The advantage of this design is that even if the controller malfunctions, the circuit can independently cut off the relay drive signal, greatly improving the reliability of the emergency stop circuit.

[0036] As an example, filter capacitors C40 and C41 are also placed between the drive signal forced blocking circuit and the relay control coil. C40 and C41 are connected in parallel across the power supply terminals of the control coil, and their function is to stabilize the power supply voltage of the control coil.

[0037] It should be noted that in actual operation, the power supply may experience some fluctuations and interference. The filter capacitor can filter these fluctuations and interference, so that the control coil can obtain a stable power supply, thereby ensuring the reliable operation of the relay.

[0038] Relay control and protection circuits:

[0039] The relay control and protection circuit includes a first relay RL1, a second relay REL1, and a freewheeling diode D16.

[0040] The control coils of the first relay RL1 and the second relay REL1 are both connected to the drive signal forced blocking circuit. When the drive signal forced blocking circuit cuts off the drive signal, the control coils of the two relays are de-energized, and the main contacts will quickly open. The main contacts of the first relay RL1 and the second relay REL1 are connected in series in the phase and neutral output circuits of the AC charging pile. This ensures that when the main contacts open, the power output of the AC charging pile can be reliably cut off, preventing harm to personnel and equipment due to excessive current or other abnormal conditions.

[0041] The freewheeling diode D16 is connected in parallel with the relay's control coil. Its function is to suppress the back electromotive force (EMF) when the relay disconnects. At the moment the relay's control coil is de-energized, a relatively high back EMF is generated due to the characteristics of inductance. Without the freewheeling diode, this back EMF could damage other components in the drive circuit. The freewheeling diode provides a discharge path for the back EMF, dissipating it and thus protecting other components in the circuit from damage.

[0042] Signal feedback notification circuit:

[0043] The main function of the signal feedback notification circuit is to send an emergency stop feedback signal to the controller when an emergency stop is triggered, so that the controller is aware of the occurrence of the emergency stop event and performs the corresponding operation. This circuit mainly consists of a feedback resistor R24.

[0044] One end of R24 is connected to the emergency stop feedback terminal of CON16, and the other end is connected to the STOP signal input terminal of the controller. When the emergency stop button is pressed, the emergency stop trigger signal output from CON16 will pull the STOP signal low through R24 and transmit it to the controller.

[0045] Upon receiving a STOP signal, the controller performs a series of operations. First, it stops sending drive signals to the relay control and protection circuit, further ensuring that the relay's main contacts remain open. Simultaneously, the controller records the emergency stop event, including the time and relevant parameters, for subsequent troubleshooting and analysis. Furthermore, the controller monitors the system status to check for any other anomalies, ensuring the safety of the entire AC charging station system.

[0046] The circuit's working process:

[0047] When the AC charging station is working normally, the emergency stop button is not pressed, and there is no emergency stop trigger signal output at the emergency stop signal output terminal of CON16. Pins 1 and 2 of the relay driver chip U4 provide drive voltage to the control coils of the first relay RL1 and the second relay REL1, causing the main contacts of the relays to close, and the phase and neutral output circuits of the AC charging station to be connected, allowing normal charging of electric vehicles and other equipment.

[0048] In case of an emergency, pressing the emergency stop button outputs an emergency stop trigger signal at terminal CON16. Firstly, this signal pulls down the voltage at pins 1 and 2 of U4 via diodes D14 and D15, cutting off the relay drive signal and causing the main contacts of relays RL1 and REL1 to quickly open, thus cutting off the power output of the AC charging pile. Secondly, the emergency stop trigger signal pulls down the STOP signal via feedback resistor R24 ​​and transmits it to the controller. Upon receiving the signal, the controller stops sending drive signals and performs emergency stop event recording and system status monitoring.

[0049] It is important to note that even in the event of abnormal situations such as program malfunction, system crash, or hardware damage to the controller, the emergency stop button trigger signal can still directly cut off the relay drive signal through the first diode D14 and the second diode D15 because the drive signal forced blocking circuit is independent of the controller settings. This ensures that the AC charging pile can reliably stop power output and protects the safety of personnel and equipment.

[0050] Based on the above, it can be concluded that this solution uses an independent circuit composed of diodes D14 and D15 to directly pull down the relay drive signal after the emergency stop button is triggered, without going through the controller. Even if the controller fails completely, it can still instantly cut off the relay power supply circuit, ensuring 100% disconnection of power output. Furthermore, it skips the controller processing flow, achieving a millisecond-level response of "button trigger → hardware direct control", avoiding power outage delays caused by controller processing delays or malfunctions.

[0051] Furthermore, during an emergency stop, the hardware circuit prioritizes forcibly disconnecting the relay, forming the "first layer of physical protection." Simultaneously, a STOP signal is sent to the controller via resistor R24, instructing it to perform subsequent emergency stop operations (such as event logging, system monitoring, and disabling control signals), forming the "second layer of software collaboration." This prevents controller malfunctions from causing relay resets, achieving dual hardware and software protection. Breaking away from the traditional reliance on a single controller, this design constructs a redundant safety path independent of the control system, elevating emergency stop reliability from the "controller level" to the "hardware circuit level." It effectively addresses extreme conditions such as electromagnetic interference, power fluctuations, and controller crashes, ensuring stable and reliable emergency stop functionality in complex environments. This provides a new approach to charging pile safety design, driving the upgrade of emergency stop technology from "signal transmission type" to "hardware forced type," and contributing to the improvement of industry safety standards.

[0052] In summary, this utility model addresses the "controller dependency" defect of traditional emergency stop circuits by constructing a safety redundancy mechanism independent of the controller through the coordinated design of hardware-level forced power-off and signal feedback. This fundamentally solves the problem of emergency stop failure when the controller fails, realizing a leap from "probabilistic protection" to "deterministic protection" for the emergency stop function, and bringing a revolutionary improvement to the safety performance of charging piles.

[0053] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] The above description is merely an example and illustration of the present utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. An emergency forced stop circuit for an AC charging station, characterized in that, include: An emergency stop button interface circuit is used to connect an emergency stop button and input an emergency stop trigger signal. The emergency stop button interface circuit includes a CON16 terminal connected to the emergency stop button. A drive signal forced blocking circuit is connected to the CON16 terminal and the relay drive control terminal, and is used to forcibly cut off the relay drive signal when an emergency stop is triggered. A relay control and protection circuit includes at least one relay, the control coil of which is connected to the drive signal forced blocking circuit, and the main contacts of which are used to cut off the power output line of the AC charging pile. A signal feedback notification circuit, connected to the CON16 terminal and the controller, is used to send an emergency stop feedback signal to the controller when an emergency stop is triggered.

2. The scram forced shutdown circuit according to claim 1, characterized by The drive signal forced blocking circuit includes a first diode D14 and a second diode D15. The anode of the first diode D14 is connected to the emergency stop trigger terminal of the CON16 terminal, and the cathode is connected to pin 1 of the relay driver chip U4. The anode of the second diode D15 is connected to the emergency stop trigger terminal of CON16, and the cathode is connected to pin 2 of U4.

3. The scram forced shutdown circuit according to claim 2, characterized by Pins 1 and 2 of U4 are relay drive signal output terminals, used to provide drive voltage to the control coil of the relay. The first diode D14 and the second diode D15 are used to pull the voltage of pins 1 and 2 of U4 down to the cutoff state when an emergency stop is triggered.

4. The scram forced shutdown circuit according to claim 1, characterized by The relay control and protection circuit includes a first relay RL1 and a second relay REL1. The control coils of the first relay RL1 and the second relay REL1 are both connected to the drive signal forced blocking circuit. The main contacts of the first relay RL1 and the second relay REL1 are connected in series in the phase line and neutral line output circuit of the AC charging pile.

5. The scram forced shutdown circuit in accordance with claim 1, wherein, The signal feedback notification circuit includes a feedback resistor R24. One end of R24 is connected to the emergency stop feedback terminal of the CON16 terminal, and the other end is connected to the STOP signal input terminal of the controller. It is used to pull the STOP signal low through R24 and transmit it to the controller when the emergency stop is triggered.

6. The scram forced shutdown circuit according to claim 4, wherein The relay control and protection circuit also includes a freewheeling diode D16, which is connected in parallel with the control coil of the relay to suppress the back electromotive force when the relay is disconnected.

7. The scram forced shutdown circuit in accordance with claim 1, wherein, The CON16 terminal of the emergency stop button interface circuit includes a positive power input terminal, a negative power input terminal, and an emergency stop signal output terminal. The emergency stop signal output terminal is connected to the drive signal forced blocking circuit and the signal feedback notification circuit.

8. The scram forced shutdown circuit in accordance with claim 1, wherein, The drive signal forced blocking circuit and the relay control coil are further provided with filter capacitors C40 and C41. C40 and C41 are connected in parallel across the power supply terminals of the control coil to stabilize the power supply voltage of the control coil.

9. The scram forced shutdown circuit according to claim 5, wherein Upon receiving the STOP signal, the controller is configured to stop sending drive signals to the relay control and protection circuit and to perform emergency stop event recording and system status monitoring.

10. The scram forcing circuit according to any one of claims 1 to 9, characterized by, The drive signal forced blocking circuit is set independently from the controller, and when the controller has program disorder, crash or hardware damage, the drive signal forced blocking circuit can still cut off the drive signal of the relay directly through the emergency stop button trigger signal.

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