Charging circuit, equipment and electric vehicle

Abstract

The utility model provides a charging circuit, equipment and an electric automobile, the charging circuit is applied to a charging pile, the charging pile is provided with a charging gun, and the charging circuit comprises a detection circuit, an emergency stop switch circuit and a charging control circuit. The detection circuit provided by the utility model can accurately detect the access condition of the equipment to be charged, avoids potential risks caused by wrong charging or mismatching of the charging equipment, and allows a user to rapidly cut off a charging path between the charging pile and the electric automobile in an emergency through the introduction of the emergency stop switch circuit, thereby improving the charging safety of the electric automobile. Therefore, possible potential safety hazards such as short circuit and overload are effectively prevented, safety of a user and equipment is ensured, the charging control circuit can quickly respond to output signals of the detection circuit and the emergency stop switch circuit, instant connection or disconnection of a charging path is achieved, and convenience and efficiency of user operation are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile charging technical field especially relates to a charging circuit, equipment and electric automobile. BACKGROUND

[0002] With the rapid development and popularization of new energy vehicles, automobile charging piles have been widely used, and the demand for charging piles is also increasing. At the same time, higher requirements are put forward for the safety, stability and compatibility of the charging pile. As an important part of the charging pile, the detection circuit is crucial for avoiding potential risks caused by mischarging or mismatching of the charging equipment by accurately detecting the access of the charging equipment.

[0003] However, the charging circuit containing the detection circuit currently lacks an emergency stop button control circuit, which cannot stop charging immediately when encountering an emergency. Therefore, it is necessary to integrate the detection circuit and the emergency stop button control circuit in the design of the charging circuit to realize the dual protection of the detection of the access of the charging equipment and the emergency stop function. SUMMARY

[0004] The main purpose of the utility model is to provide a charging circuit, equipment and electric automobile, which aims to solve the problem of lack of emergency stop button control circuit in the charging circuit between the current charging pile and electric automobile.

[0005] In view of the above defects, the utility model provides a charging circuit applied to a charging pile, wherein the charging pile has a charging gun, and the charging circuit comprises:

[0006] A detection circuit connected with the charging gun, used for detecting the access of the charging equipment and outputting a detection signal and a feedback signal when receiving a control signal;

[0007] An emergency stop switch circuit, used for outputting an emergency stop signal when the switch is closed by the user operation;

[0008] A charging control circuit, wherein the plug-in signal input end of the charging control circuit is electrically connected with the output end of the detection circuit, and the emergency stop signal input end is electrically connected with the output end of the emergency stop switch circuit, and the charging control circuit is used for receiving and outputting a charging control signal according to the detection signal output by the detection circuit, so as to control the conduction / disconnection of the charging path between the charging pile and the electric automobile;

[0009] The charging control circuit is also used for receiving the emergency stop signal output by the emergency stop switch circuit to output an emergency stop control signal when the path between the charging pile and the electric automobile is conducted, so as to disconnect the path between the charging pile and the electric automobile.

[0010] Optionally, the charging control circuit comprises:

[0011] MCU circuit, an insertion gun signal input end of the MCU circuit is electrically connected with an output end of the detection circuit, and an emergency stop signal input end is electrically connected with an output end of the emergency stop switch circuit; the MCU circuit is used for receiving and outputting a charging control signal according to a detection signal output by the detection circuit, so as to control the on / off of a charging path between the charging pile and the electric vehicle;

[0012] The MCU circuit is further used for receiving an emergency stop signal output by the emergency stop switch circuit to output an emergency stop control signal when the path between the charging pile and the electric vehicle is on, so as to disconnect the path between the charging pile and the electric vehicle.

[0013] The charging switch circuit is electrically connected with the output end of the MCU circuit, and is used for receiving and turning on / off the path between the charging pile and the electric vehicle according to the charging control signal output by the MCU circuit, or receiving and disconnecting the path between the charging pile and the electric vehicle according to the emergency stop control signal output by the MCU circuit when the path between the charging pile and the electric vehicle is on.

[0014] Optionally, the detection circuit comprises:

[0015] The plug-in detection circuit is used for detecting the access of the device to be charged and outputting a detection signal.

[0016] The plug-in feedback circuit is electrically connected with the charging gun and the accessed device to be charged, and is used for receiving and outputting a PWM feedback signal to the electric vehicle according to the PWM signal output by the MCU circuit.

[0017] Optionally, the charging circuit further comprises a forward input power supply and a reverse input power supply.

[0018] The detection circuit comprises a first optocoupler, a first switch tube and a second switch tube; the light-emitting end of the first optocoupler is electrically connected with the PWM output end of the MCU circuit, the receiving end of the first optocoupler is electrically connected with the base of the first switch tube and the second switch tube, the gate of the first switch tube is electrically connected with the forward input power supply, the gate of the second switch tube is electrically connected with the reverse input power supply, and the sources of the first switch tube and the second switch tube output the detection signal / PWM feedback signal through a third resistor.

[0019] Optionally, the emergency stop switch circuit comprises an emergency stop switch and a second optocoupler.

[0020] One end of the emergency stop switch circuit is electrically connected with the forward input power supply, and the other end is connected with the light-emitting end of the second optocoupler; the receiving end of the second optocoupler is electrically connected with the emergency stop signal input end of the MCU circuit.

[0021] Optionally, the charging circuit further comprises a zero line and a live line, and the charging switch circuit comprises a third switch tube, a first relay and a second relay;

[0022] The controlled end of the third switch tube is electrically connected with the output end of the MCU circuit, the input end of the third switch tube is electrically connected with one end of the coil of the first relay and one end of the coil of the second relay respectively, the output end of the third switch tube is grounded, and the other end of the coil of the first relay and the other end of the coil of the second relay are electrically connected with the positive input power supply;

[0023] The first relay is used for turning on / off the live line connection between the charging pile and the electric vehicle.

[0024] The second relay is used for turning on / off the zero line connection between the charging pile and the electric vehicle.

[0025] Optionally, the charging circuit further comprises:

[0026] A power supply circuit, wherein the input end of the power supply circuit is electrically connected with the positive input power supply, and the output end of the power supply circuit is electrically connected with the power supply input ends of the detection circuit, the emergency stop switch circuit and the charging control circuit; and the power supply circuit is used for supplying power to the detection circuit, the emergency stop switch circuit and the charging control circuit.

[0027] Optionally, the power supply circuit comprises:

[0028] A DC-DC step-down circuit, wherein the input end of the DC-DC step-down circuit is electrically connected with the positive input power supply, and the DC-DC step-down circuit is used for converting the voltage of the positive input power supply into a first voltage to supply power to the LDO step-down circuit.

[0029] An LDO step-down circuit, wherein the input end of the LDO step-down circuit is electrically connected with the output end of the DC-DC step-down circuit, and the output end of the LDO step-down circuit is electrically connected with the power supply input ends of the detection circuit, the emergency stop switch circuit and the charging control circuit.

[0030] The LDO step-down circuit is used for converting the first voltage into a second voltage to supply power to the detection circuit, the emergency stop switch circuit and the charging control circuit.

[0031] The utility model also proposes a kind of charging equipment, including the charging circuit as described above.

[0032] The utility model also proposes a kind of electric vehicle, including charging interface, main control circuit and vehicle body circuit;

[0033] The vehicle body circuit is connected with plug-in detection circuit when charging gun is inserted into charging interface;The vehicle body circuit is used for dividing voltage to the output voltage of plug-in detection circuit when charging gun is inserted into charging interface, to change the detection signal output by plug-in detection circuit.

[0034] The main control circuit is connected with the gun insertion feedback circuit when the charging gun is inserted into the charging interface; the main control circuit is used for receiving and outputting a control signal according to a PWM feedback signal output by the gun insertion feedback circuit, so as to control the electric vehicle to be in a state of preparing for charging.

[0035] The detection circuit of the utility model can accurately detect the access condition of the equipment to be charged, avoid potential risks caused by mischarging or mismatching of charging equipment, and simultaneously introduce the emergency stop switch circuit to allow the user to quickly cut off the charging path between the charging pile and the electric vehicle in an emergency, thereby effectively preventing possible short circuit, overload and other safety hazards, ensuring the safety of the user and the equipment, and the charging control circuit can quickly respond to the output signal of the detection circuit and the emergency stop switch circuit, realize instant conduction or disconnection of the charging path, and improve the convenience and efficiency of user operation. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and 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 be obtained from the structure shown in the drawings without creative labor.

[0037] Figure 1 It is a framework diagram of the charging circuit of the utility model;

[0038] Figure 2 It is a detection circuit diagram of the charging circuit of the utility model;

[0039] Figure 3 It is an emergency stop switch circuit diagram of the charging circuit of the utility model;

[0040] Figure 4 It is an MCU circuit diagram of the charging circuit of the utility model;

[0041] Figure 5 It is a charging switch circuit diagram of the charging circuit of the utility model;

[0042] Figure 6 It is a vehicle body circuit diagram of the charging circuit of the utility model;

[0043] Figure 7 It is a power supply circuit diagram of the charging circuit of the utility model.

[0044] Drawing reference: detection circuit 01, emergency stop switch circuit 02, charging control circuit 03, MCU circuit 31, charging switch circuit 32, vehicle body circuit 04.

[0045] The purposes, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0047] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0048] In addition, if the embodiments of the utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled persons in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0049] The utility model provides a kind of charging circuit, it is applied to charging pile, charging pile has charging gun, as shown in the figure, charging circuit includes:

[0050] Detection circuit 01 is connected with charging gun, is used to detect the access condition of equipment to be charged and output detection signal and output feedback signal when receiving control signal;

[0051] Emergency stop switch circuit 02 is used to output emergency stop signal when being operated and triggered by user to output switch;

[0052] The charging control circuit 03 is electrically connected with the output end of the detection circuit 01 through a plug-in signal input end, and is electrically connected with the output end of the emergency stop switch circuit 02 through an emergency stop signal input end. The charging control circuit 03 is used for receiving and outputting a charging control signal according to the detection signal output by the detection circuit 01, so as to control the on / off of the charging path between the charging pile and the electric vehicle.

[0053] The charging control circuit 03 is also used for receiving an emergency stop signal output by the emergency stop switch circuit 02 to output an emergency stop control signal when the path between the charging pile and the electric vehicle is turned on, so as to disconnect the path between the charging pile and the electric vehicle.

[0054] More specifically, the charging pile is equipped with a dedicated charging gun that matches the charging port on the electric vehicle. When the electric vehicle is parked near the charging pile and is ready to charge, the user inserts the charging gun of the charging pile into the charging port of the electric vehicle. After the charging gun is connected with the charging port, communication and electrical connection are established between the charging pile and the electric vehicle. The charging circuit inside the charging pile is responsible for transmitting the electric energy provided by the charging pile to the battery of the electric vehicle. The design of the charging circuit not only considers the transmission efficiency of electric energy, but also ensures the safety and stability of the charging process.

[0055] To avoid potential risks caused by mischarging or mismatched charging equipment, the charging circuit needs to include a detection circuit 01 to detect the access of the device to be charged. However, the charging circuit containing the detection circuit 01 currently lacks an emergency stop button control circuit, which cannot immediately stop charging when encountering an emergency. Therefore, it is necessary to integrate the detection circuit 01 and the emergency stop button control circuit in the design of the charging circuit to realize the detection of the access of the device to be charged and the dual protection of the emergency stop function.

[0056] To solve the above problems, the application provides a charging circuit applied to a charging pile, the charging pile having a charging gun, and the charging circuit comprising:

[0057] The detection circuit 01 is connected with the charging gun and is used for detecting the access of the device to be charged and outputting a detection signal and a feedback signal when receiving a control signal. In the present application, the detection circuit 01 includes a detection and feedback circuit. The detection circuit 01 detects the access of the device to be charged and outputs different detection signals to the control circuit according to different access conditions, thereby controlling the charging between the charging pile and the electric vehicle. The feedback circuit outputs a feedback signal to the electric vehicle when receiving a control signal, so that the electric vehicle is in a ready-to-charge state.

[0058] The emergency stop switch circuit 02 is used for outputting an emergency stop signal when a user operates a trigger switch to close the switch. The main function of the emergency stop switch circuit 02 is to output an emergency stop signal when the user encounters an emergency situation, by manually operating the trigger switch to close the switch. This signal is immediately and unconditionally required to disconnect the charging path between the charging pile and the electric vehicle by the charging control circuit 03. The emergency stop switch circuit 02 usually includes a normally open contact (NO) switch. In the normal state, the contact is in the open state. When the user presses the emergency stop button, the contact is closed, the circuit is turned on, and an electrical signal (usually low or high, depending on the circuit design) is output as an emergency stop signal.

[0059] The charging control circuit 03 is electrically connected to the output end of the detection circuit 01 and the output end of the emergency stop switch circuit 02. The charging control circuit 03 is used for receiving and outputting a charging control signal according to the detection signal output by the detection circuit 01, to control the conduction / disconnection of the charging path between the charging pile and the electric vehicle.

[0060] The charging control circuit 03 is also used for receiving the emergency stop signal output by the emergency stop switch circuit 02 when the path between the charging pile and the electric vehicle is conducted, and outputting an emergency stop control signal to disconnect the path between the charging pile and the electric vehicle.

[0061] The charging control circuit 03 usually includes an MCU circuit 31 and a charging switch circuit 32. The MCU circuit 31 is used for receiving the detection signal from the detection circuit 01 and the emergency stop signal, and judging whether the charging condition is met according to the detection signal output by the detection circuit 01. If the condition is met (such as the charging gun is correctly inserted), the charging control circuit 03 outputs a charging control signal to the charging switch circuit 32 to make the charging path conductive. After receiving the emergency stop signal, the MCU circuit 31 immediately outputs an emergency stop control signal to the charging switch circuit 32 to disconnect the charging path. The charging switch circuit 32 is used for receiving the control signal from the MCU circuit 31 to disconnect or conduct the charging path between the charging pile and the electric vehicle.

[0062] The detection circuit 01 of the utility model can accurately detect the access condition of the device to be charged, avoid potential risks caused by mischarging or mismatching of the charging device, and allow the user to quickly disconnect the charging path between the charging pile and the electric vehicle in an emergency situation by introducing the emergency stop switch circuit 02, thereby effectively preventing possible short circuit, overload and other safety hazards, ensuring the safety of the user and the device. The charging control circuit 03 can quickly respond to the output signals of the detection circuit 01 and the emergency stop switch circuit 02, realize the instantaneous conduction or disconnection of the charging path, and improve the convenience and efficiency of user operation.

[0063] In an embodiment, as Figure 4 WithFigure 5 As shown in the figure, the charging control circuit 03 includes:

[0064] The MCU circuit 31, the plug-in signal input end of the MCU circuit 31 is electrically connected with the output end of the detection circuit 01, and the emergency stop signal input end is electrically connected with the output end of the emergency stop switch circuit 02; the MCU circuit 31 is used for receiving and outputting a charging control signal according to the detection signal output by the detection circuit 01, so as to control the conduction / disconnection of the charging path between the charging pile and the electric vehicle;

[0065] When the charging gun of the charging pile is inserted into the access port of the electric vehicle, the detection circuit 01 starts to work and outputs a detection signal, and the MCU circuit 31 receives the detection signal to determine whether the to-be-charged device is correctly connected and in a normal state. If the device is correctly connected and in a normal state, the MCU circuit 31 outputs a charging control signal to the charging switch circuit 32 to conduct the charging path, and at the same time, the MCU circuit 31 outputs a control signal to the detection circuit 01, so that the detection circuit 01 outputs a feedback signal to the electric vehicle to indicate that the electric vehicle is in a charging state.

[0066] The MCU circuit 31 is also used for receiving an emergency stop signal output by the emergency stop switch circuit 02 to output an emergency stop control signal when the path between the charging pile and the electric vehicle is conducted, so as to disconnect the path between the charging pile and the electric vehicle;

[0067] If the user encounters an emergency during the charging process, the emergency stop signal can be triggered by operating the emergency stop switch circuit 02. After the MCU circuit 31 receives the emergency stop signal, an emergency stop control signal is immediately output, and after the charging switch circuit 32 receives the emergency stop control signal, the charging path is immediately disconnected, ensuring safety.

[0068] The charging switch circuit 32, the control end of the charging switch circuit 32 is electrically connected with the output end of the MCU circuit 31, and the charging switch circuit 32 is used for receiving and conducting / disconnecting the path between the charging pile and the electric vehicle according to the charging control signal output by the MCU circuit 31, or receiving and disconnecting the path between the charging pile and the electric vehicle according to the emergency stop control signal output by the MCU circuit 31 when the path between the charging pile and the electric vehicle is conducted.

[0069] The charging switch circuit 32 serves as an execution mechanism to control the charging path between the charging pile and the electric vehicle according to the signal output by the MCU circuit 31. When the charging control signal is received, the charging switch circuit 32 conducts the charging path; when the emergency stop control signal is received, the charging switch circuit 32 immediately disconnects the charging path. In the present application, the charging switch circuit 32 includes a relay, and the relay in the charging switch circuit 32 is usually configured in a normally open or normally closed state. When the MCU circuit 31 outputs the charging control signal, the relay changes its state (from normally open to normally closed or from normally closed to normally open), thereby controlling the conduction or disconnection of the charging path.

[0070] In an embodiment, the detection circuit 01 comprises:

[0071] a plug-in detection circuit for detecting the access of the device to be charged and outputting a detection signal;

[0072] The power supply is connected to the input end of the plug-in detection circuit, and the CP signal at the output end is the detection signal. When the gun head is not inserted into the charging port of the car, the CP signal at the output end is the power supply signal. When the gun head is inserted into the charging port of the car, the output end will be electrically connected to the body circuit 04 of the car, thereby reducing the voltage of the CP signal. When the MCU circuit 31 receives the detection signal with different voltages, it will output different control signals to the charging switch circuit 32, thereby controlling the conduction or disconnection of the charging path.

[0073] a plug-in feedback circuit, the output end of the plug-in feedback circuit being used for connecting with the device to be charged through the charging gun; the plug-in feedback circuit being used for receiving and outputting a PWM feedback signal to the electric vehicle according to the PWM signal output by the MCU circuit 31. When the MCU circuit 31 receives the detection signal output by the plug-in detection circuit when the gun head is inserted into the charging port of the car, it outputs the PWM signal to the plug-in feedback circuit, and the plug-in feedback circuit outputs the PWM feedback signal corresponding to the input PWM signal to the electric vehicle, so as to make the electric vehicle.

[0074] The detection circuit 01 further comprises an operational amplifier, the CP signal at the output end enters the operational amplifier, and VOUT is obtained. After being divided by the resistors R4 and R7, a divided voltage is obtained. The MCU circuit 31 detects this voltage and then outputs different control signals to the charging switch circuit 32, thereby controlling the conduction or disconnection of the charging path. Through the amplification of the operational amplifier, it can ensure that the signal strength is sufficient and improve the detection accuracy and stability of the subsequent circuit.

[0075] In an embodiment, as shown in Figure 2 the charging circuit further comprises a forward input power supply and a reverse input power supply;

[0076] The plug-in detection circuit and the plug-in feedback circuit can be integrated in one circuit module to reduce the complexity of the circuit, reduce the cost and simplify the wiring. The detection circuit 01 of the present embodiment comprises a first optocoupler, a first switch tube and a second switch tube. The light-emitting end of the first optocoupler is electrically connected to the PWM output end of the MCU circuit 31, the receiving end of the first optocoupler is electrically connected to the base of the first switch tube and the second switch tube, the gate of the first switch tube is electrically connected to the forward input power supply, the gate of the second switch tube is electrically connected to the reverse input power supply, and the sources of the first switch tube and the second switch tube output the detection signal / PWM feedback signal through the third resistor.

[0077] When the gun head is not inserted into the car charging port, the receiving end of the first optocoupler is connected to 12V voltage, the first switch tube is turned on, the second switch tube is not turned on, and the CP signal of the output end is 12V. When the gun head is inserted into the car charging port, the receiving end of the first optocoupler is connected to 12V voltage, the first switch tube is turned on, the second switch tube is not turned on, the output end is electrically connected with the vehicle body circuit 04, the vehicle body circuit 04 divides the voltage of the output end, so that the CP signal of the output end is less than 12V, at this time the MCU circuit 31 triggers the pulse PWM waveform to the light emitting end of the first optocoupler, controls the first optocoupler to work, so as to control the first switch tube and the second switch tube to work alternately, and the output end generates PWM feedback signal to the electric vehicle, so as to make the electric vehicle.

[0078] In an embodiment, as shown in Figure 2 The emergency stop switch circuit 02 includes an emergency stop switch and a second optocoupler.

[0079] The emergency stop switch circuit 02 is electrically connected with the positive input power supply at one end, and is connected with the light emitting end of the second optocoupler at the other end. The receiving end of the second optocoupler is electrically connected with the emergency stop signal input end of the MCU circuit 31. When the emergency stop switch is in the closed state, the circuit is in the pass-through state, and the light emitting end of the second optocoupler receives electric energy and emits light.

[0080] Connection of the optocoupler and the MCU circuit 31: The receiving end of the second optocoupler is electrically connected with the emergency stop signal input end of the MCU circuit 31. When the photodiode of the light emitting end of the second optocoupler works, the internal triode is turned on, the collector and the emitter are turned on, and the optical signal is received by the receiving end and converted into an electric signal. The voltage 3.3V supplied to the triode is divided by R17 and R19 resistors to obtain a voltage, and the MCU circuit 31 collects the AD voltage at this point to determine whether the emergency stop switch is pressed. The MCU circuit 31 sends a control signal to the charging switch circuit 32 to disconnect the charging path.

[0081] When the emergency stop switch is turned off, the second optocoupler does not work, and the voltage divided by R17 and R19 is 0, which is a low level. When the MCU circuit 31 detects the low level, the MCU circuit 31 sends a control signal to the charging switch circuit 32 by default to turn on the charging path.

[0082] In an embodiment, the charging circuit further includes a zero line and a live line, and the charging switch circuit 32 includes a third switch tube, a first relay and a second relay.

[0083] The controlled end of the third switch tube is electrically connected with the output end of the MCU circuit 31, the input end of the third switch tube is electrically connected with one end of the coil of the first relay and one end of the coil of the second relay respectively, the output end of the third switch tube is grounded, the other end of the coil of the first relay and the other end of the coil of the second relay are electrically connected with the positive input power supply; the MCU circuit 31 can open or close the third switch tube by sending a control signal, so as to realize accurate control of the whole charging switch circuit 32.

[0084] The first relay is used for turning on / off the live line connection between the charging pile and the electric vehicle; the second relay is used for turning on / off the zero line connection between the charging pile and the electric vehicle.

[0085] When the MCU circuit 31 outputs a high level to the third switch tube, the third switch tube is turned on, the coils of the first relay and the second relay are energized, the first relay and the second relay are controlled to act, so that the main contact is closed, the live line and the zero line connection between the charging pile and the electric vehicle are turned on, a loop is formed, and the charging process is started.

[0086] On the contrary, when it is needed to stop charging, the MCU circuit 31 outputs a low level to the third switch tube, the third switch tube is not turned on, the coils of the first relay and the second relay are not energized, the main contact of the relay is opened, and the charging cannot be performed.

[0087] In an embodiment, as shown in Figure 7 The charging circuit further comprises:

[0088] The power supply circuit is electrically connected with the positive input power supply at the input end, and is electrically connected with the power supply input ends of the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03 at the output end; the power supply circuit is used for supplying power to the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03. In this embodiment, the front-end flyback power supply outputs positive and negative 12V power supply, and a step-down circuit is included in the power supply circuit. The step-down circuit reduces 12V to 5V, and then reduces 5V to 3.3V to supply the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03.

[0089] In an embodiment, the power supply circuit comprises:

[0090] The DC-DC step-down circuit is electrically connected with the positive input power supply at the input end, and is used for converting the voltage of the positive input power supply into a first voltage to supply power to the LDO step-down circuit.

[0091] The LDO step-down circuit is electrically connected with the DC-DC step-down circuit at the input end, and is electrically connected with the power supply input ends of the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03 at the output end.

[0092] The LDO voltage reduction circuit is used for converting the first voltage into a second voltage to supply power to the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03.

[0093] In the embodiment, the front-end flyback power supply outputs positive and negative 12V power supply, and the DC-DC voltage reduction circuit reduces the 12V power supply to the first voltage 5V by adjusting the DC power supply voltage. The LDO voltage reduction circuit further converts the first voltage 5V output by the DC-DC voltage reduction circuit into a lower DC voltage 3.3V, i.e. the second voltage, for use of the detection circuit 01, the emergency stop switch circuit 02 and the charging control circuit 03.

[0094] The utility model discloses still propose a kind of charging equipment, including charging circuit as above. Charging circuit includes detection circuit 01, emergency stop switch circuit 02 and charging control circuit 03. Detection circuit 01 can accurately detect the access condition of equipment to be charged, avoid potential risks caused by mischarge or charging equipment mismatching, while the introduction of emergency stop switch circuit 02 allows user to rapidly cut off the charging path between charging pile and electric vehicle in emergency, to effectively prevent possible short circuit, overload and other security risks, ensure the safety of user and equipment, charging control circuit 03 can quickly respond to the output signal of detection circuit 01 and emergency stop switch circuit 02, realize the instant conduction or disconnection of charging path, improve the convenience and efficiency of user operation.

[0095] The utility model discloses still propose a kind of electric vehicle, including charging interface, main control circuit and vehicle body circuit 04;

[0096] Vehicle body circuit 04 is connected with plug-in detection circuit 01 when charging gun is inserted into charging interface;Vehicle body circuit 04 is used to divide voltage output by plug-in detection circuit when charging gun is inserted into charging interface, to change detection signal output by plug-in detection circuit;

[0097] Main control circuit is connected with plug-in feedback circuit when charging gun is inserted into charging interface;Main control circuit is used to receive and output control signal according to PWM feedback signal output by plug-in feedback circuit, to control electric vehicle to be in preparation charging state.

[0098] When charging gun is inserted into charging interface of electric vehicle, vehicle body circuit 04 is connected with plug-in detection circuit, and vehicle body circuit 04 divides voltage output by plug-in detection circuit at this time, to change detection signal output by plug-in detection circuit. More specifically, as shown in Figure 6 The utility model discloses still propose a kind of electric vehicle, including charging interface, main control circuit and vehicle body circuit 04;

[0099] When the charging gun is inserted into the charging interface of the electric vehicle, the power supply is divided by the body resistance R1 and R20, and the divided voltage is about 9V, so that the body switch is closed, R2 and R1 are connected in parallel, and R20 is connected in series, and the CP voltage is 6V, so that the CP voltage is 6V. Then, the 6V voltage is divided by the resistance R4 and R7 through the operational amplifier and the rear-end resistance, and the MCU circuit 31 collects the voltage AD from this point, and detects that the charging gun has been connected with the vehicle charging interface. Then the MCU circuit 31 sends a pulse 6V PWM waveform to the light emitting end of the first optocoupler, controls the first optocoupler to work, so as to control the first switch tube and the second switch tube to work alternately, and when the high level is 6V, the CP voltage is connected, and when the low level is-12V, the CP point voltage is connected, and the PWM 6V voltage waveform is generated alternately. When the vehicle circuit detects that the CP voltage is PWM 6V, it is ready to start charging.

[0100] In order to better illustrate the concept of the utility model, the following is combined with the above embodiment Figures 2-7 The working principle of the utility model is described: the embodiment is powered by the front end of the flyback power supply, and the voltage 12V and-12V are provided respectively, Figure 7 It is known that the 12V voltage is reduced to 5V through the DC-DC circuit, and then reduced to 3.3V through the LDO circuit, and the MCU circuit 31, the second optocoupler receiving end of the emergency stop switch circuit 02 and the light emitting end of the first optocoupler U2 of the detection circuit 01 are powered.

[0101] When the charging gun is not inserted into the charging interface of the electric vehicle, the pin of the first optocoupler U2 is connected to 12V, the first switch tube Q2 is turned on, the second switch tube Q3 is not turned on, and the CP point voltage is 12V. The CP point voltage 12V enters the operational amplifier U1, the operational amplifier uses the voltage follower principle, the input impedance is infinite, the output impedance is very small, so that the output voltage VOUT is 12V, the output voltage VOUT of 12V is divided by the resistance R4 and R7, the divided voltage is 2.97V, the single-chip microcomputer U5 of the MCU circuit 31 detects this voltage, and knows that the gun is not inserted, so as to control the single-chip microcomputer U5 to output low level to the third switch tube Q1 of the charging switch circuit 32, the third switch tube Q1 is not turned on, the coils of the first relay and the second relay cannot form a loop, and the main contact of the relay is disconnected, so that the charging cannot be carried out.

[0102] When the charging gun is inserted into the charging interface of the electric vehicle, the detection circuit 01 is connected with the vehicle body circuit 04, and the voltage at the CP point returns to the ground through D1 and R1 of the vehicle body circuit 04. The voltage is divided by the vehicle body resistors R1 and R20, and the divided voltage is about 9V of the power supply, so that the vehicle body itself is turned on, R2 and R1 are connected in parallel, and R20 is connected in series, and the CP voltage is 6V, so that the CP voltage 6V is obtained, the voltage AD is collected from the point by the single-chip microcomputer U5 through the U1 operational amplifier and the rear-end R4 and R7 resistor voltage dividing circuit, and it is detected that the charging gun has been connected with the vehicle body charging interface.

[0103] Then the single-chip microcomputer U5 sends the pulse 6VPWM waveform to the light-emitting end of the first optocoupler U2, controls the first optocoupler U2 to start working, controls the first switch tube Q2 and the first switch tube Q3 to work alternately, and the CP voltage is connected when the high level is 6V, and the CP point voltage is connected when the low level is-12V, and the PWM 6V voltage waveform is generated alternately. When the CP voltage is PWM 6V, the main control circuit of the electric vehicle detects that the charging is ready to start, at this time, the single-chip microcomputer U5 outputs the high level to the third switch tube Q1, the third switch tube Q1 is turned on, the coils of the first relay and the second relay are powered, and the first relay and the second relay are actuated, so that the main contact is closed, and the electric vehicle is charged.

[0104] In the charging state, when the emergency stop switch is not pressed, the emergency stop switch is turned off, the first optocoupler has no voltage, and the light-emitting end diode of the first optocoupler does not work, so that the collector and the emitter of the receiving end triode in the interior are not turned on. The voltage divided by R17 and R19 is 0, which is low level, when the single-chip microcomputer U5 detects the low level, the single-chip microcomputer U5 outputs the high level to the third switch tube Q1 by default, the third switch tube Q1 is turned on, the coils of the first relay and the second relay are always powered, and the main contact of the relay is always closed. The charging pile normally charges the vehicle.

[0105] When the emergency stop is needed, the emergency stop switch is pressed, the emergency stop switch is closed, the light-emitting end of the first optocoupler is powered, and the photoelectric diode works, so that the receiving end triode is turned on, the collector and the emitter are turned on, the voltage obtained by voltage division of 3.3V through R17 and R19 resistors, the single-chip microcomputer U5 collects the AD voltage at this point, and outputs the low level to the third switch tube Q1, the third switch tube Q1 is turned off, the coils of the first relay and the second relay are powered off, and the main contact is turned off, so that the charging cannot be performed.

[0106] The above embodiment is only a preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation obtained by using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A charging circuit for use in a charging pile, the charging pile having a charging gun, characterized in that, The charging circuit includes: The detection circuit, connected to the charging gun, is used to detect the connection status of the device to be charged and output a detection signal, as well as output a feedback signal when a control signal is received. An emergency stop switch circuit is used to output an emergency stop signal when the switch is closed by user operation. The charging control circuit has its plug-in signal input terminal electrically connected to the output terminal of the detection circuit, and its emergency stop signal input terminal electrically connected to the output terminal of the emergency stop switch circuit. The charging control circuit is used to receive and output a charging control signal according to the detection signal output by the detection circuit, so as to control the charging path between the charging pile and the electric vehicle to be connected / disconnected. The charging control circuit is also used to receive the emergency stop signal output by the emergency stop switch circuit and output an emergency stop control signal to disconnect the path between the charging pile and the electric vehicle when the path between the charging pile and the electric vehicle is open.

2. The charging circuit according to claim 1, characterized in that, The charging control circuit includes: The MCU circuit has its plug-in signal input terminal electrically connected to the output terminal of the detection circuit, and its emergency stop signal input terminal electrically connected to the output terminal of the emergency stop switch circuit. The MCU circuit is used to receive and output a charging control signal according to the detection signal output by the detection circuit, so as to control the charging path between the charging pile and the electric vehicle to be turned on / off. The MCU circuit is also used to receive the emergency stop signal output by the emergency stop switch circuit and output an emergency stop control signal to disconnect the path between the charging pile and the electric vehicle when the path between the charging pile and the electric vehicle is open. A charging switch circuit is provided, wherein the control terminal of the charging switch circuit is electrically connected to the output terminal of the MCU circuit. The charging switch circuit is used to receive and, according to the charging control signal output by the MCU circuit, turn on / off the path between the charging pile and the electric vehicle, or, when the path between the charging pile and the electric vehicle is turned on, receive and, according to the emergency stop control signal output by the MCU circuit, turn off the path between the charging pile and the electric vehicle.

3. The charging circuit according to claim 2, characterized in that, The detection circuit includes: The plug-in detection circuit is used to detect the connection status of the device to be charged and output a detection signal. A plug-in feedback circuit is provided, the output of which is used to connect to the charging device via a charging gun; the plug-in feedback circuit is used to receive and output a PWM feedback signal to the electric vehicle according to the PWM signal output by the MCU circuit.

4. The charging circuit according to claim 3, characterized in that, The charging circuit also includes a positive input power supply and a reverse input power supply; The detection circuit includes a first optocoupler, a first switching transistor, and a second switching transistor. The light-emitting end of the first optocoupler is electrically connected to the PWM output end of the MCU circuit, the receiving end of the first optocoupler is electrically connected to the base of the first and second switching transistors, the gate of the first switching transistor is electrically connected to the forward input power supply, the gate of the second switching transistor is electrically connected to the reverse input power supply, and the sources of the first and second switching transistors output a detection signal / PWM feedback signal through a third resistor.

5. The charging circuit according to claim 2, characterized in that, The emergency stop switch circuit includes an emergency stop switch and a second optocoupler; One end of the emergency stop switch circuit is electrically connected to the positive input power supply, and the other end is connected to the light-emitting end of the second optocoupler. The receiving end of the second optocoupler is electrically connected to the emergency stop signal input end of the MCU circuit.

6. The charging circuit according to claim 3, characterized in that, The charging circuit also includes a neutral wire and a live wire, and the charging switch circuit includes a third switch transistor, a first relay and a second relay; The controlled terminal of the third switch is electrically connected to the output terminal of the MCU circuit. The input terminal of the third switch is electrically connected to one end of the coil of the first relay and one end of the coil of the second relay, respectively. The output terminal of the third switch is grounded. The other ends of the coils of the first relay and the second relay are electrically connected to the positive input power supply. The first relay is used to connect / disconnect the live wire connection between the charging pile and the electric vehicle; The second relay is used to connect / disconnect the neutral wire connection between the charging pile and the electric vehicle.

7. The charging circuit according to claim 4, characterized in that, The charging circuit also includes: The power supply circuit has its input terminal electrically connected to a positive input power supply, and its output terminal electrically connected to the power input terminals of the detection circuit, the emergency stop switch circuit, and the charging control circuit; the power supply circuit is used to supply power to the detection circuit, the emergency stop switch circuit, and the charging control circuit.

8. The charging circuit according to claim 7, characterized in that, The power supply circuit includes: The DC-DC step-down circuit has its input terminal electrically connected to the positive input power supply. The DC-DC step-down circuit is used to convert the voltage of the positive input power supply into a first voltage to power the LDO step-down circuit. The LDO step-down circuit has its input terminal electrically connected to the output terminal of the DC-DC step-down circuit, and its output terminal electrically connected to the power input terminals of the detection circuit, the emergency stop switch circuit, and the charging control circuit. The LDO step-down circuit is used to convert the first voltage into a second voltage to power the detection circuit, the emergency stop switch circuit, and the charging control circuit.

9. A charging device, characterized in that, Includes the charging circuit as described in any one of claims 1-8.

10. An electric vehicle, characterized in that, This includes the charging interface, main control circuit, and vehicle body circuitry. The vehicle body circuit is connected to the plug-in detection circuit when the charging gun is inserted into the charging interface; the vehicle body circuit is used to divide the output voltage of the plug-in detection circuit when the charging gun is inserted into the charging interface, so as to change the detection signal output by the plug-in detection circuit. The main control circuit is connected to the charging gun feedback circuit when the charging gun is inserted into the charging interface; the main control circuit is used to receive and output a control signal according to the PWM feedback signal output by the charging gun feedback circuit, so as to control the electric vehicle to be in the charging preparation state.

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