A smart charging gun head

Abstract

A smart charging gun head includes a charging gun head body, a battery, a voltage stabilizing module, a locking mechanism and a reset circuit; the locking mechanism includes a motor reduction mechanism, a locking plate, a power switch, a force-sensitive resistor and a trigger subcircuit; the plug-in part of the charging gun head body has an open slot, a guide hole and a shell, the motor reduction mechanism is installed on the guide hole, the locking plate is located in the open slot, the locking plate and the lower screw rod of the power output shaft of the motor reduction mechanism are threadedly connected, and the power switch is installed at the front upper end of the open slot; the force-sensitive resistor is installed at the front upper end of the locking plate; the reset circuit includes a touch plate and a control subcircuit, the touch plate is installed outside the shell, the battery, the voltage stabilizing module, the trigger subcircuit, and the control subcircuit are installed in the shell and electrically connected to the power switch and the force-sensitive resistor. The present invention ensures that the charging gun head body can be in close contact with the charging socket and has good conductivity during charging, and realizes automatic control. Based on the above, the present invention has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile accessory equipment, in particular to an intelligent charging gun head. Background Art

[0002] Electric vehicles are increasingly used due to their low cost and environmental friendliness. When charging an electric vehicle, you need to insert the charging gun head of the charging pile into the charging socket on the vehicle (generally, the charging gun head has multiple elastic hollow plugs, the vehicle's charging socket has multiple corresponding plug rods, or the vehicle's charging socket has multiple hollow sockets and the charging gun head has multiple plug rods), and then charge the battery on the vehicle. Since the charging gun head is inserted into the charging socket by plugging, especially after the charging gun head has been used for a long time and the metal fatigue elasticity has deteriorated, it will cause the metal plug rod of the vehicle's charging socket to be unstable (or the charging socket on the vehicle has been used for a long time and the metal fatigue elasticity has deteriorated, causing the metal plug rod of the charging gun head to be unstable), which may cause poor contact and affect charging. In summary, it is particularly necessary to provide a charging gun head that can increase the stability of the plug-in part with the vehicle's charging port during charging. Summary of the invention

[0003] In order to overcome the disadvantage that the charging gun head for the existing charging pile has a probability of poor contact with the plug-in part of the electric vehicle charging socket due to structural limitations and metal fatigue after a long period of use, the present invention provides a charging gun head body. In application, under the joint action of relevant mechanisms and circuits, after the charging gun head is inserted into the vehicle charging socket, the locking plate can automatically rise to a height so that the upper end of the charging gun head is in close contact with the upper inner part of the charging socket of the vehicle charging socket. After charging is completed, the charger only needs to control the locking plate to return to its position by touch, and conveniently remove the charging gun head body, thereby ensuring that the charging gun head body can be in close contact with the charging socket and has good conductive performance during charging, and realizes an intelligent charging gun head with automatic control.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A smart charging gun head, comprising a charging gun head body, a battery, and a voltage stabilizing module, characterized in that it also has a locking mechanism and a reset circuit; the locking mechanism comprises a motor reduction mechanism, a locking plate, a power switch, a force-sensitive resistor and a trigger sub-circuit; an open slot is provided on the plug-in part of the charging gun head body, a vertically penetrating guide hole is provided at the rear end of the open slot, the motor reduction mechanism is installed at the upper end of the guide hole, the locking plate is located in the open slot, an internally threaded opening is provided at the rear end of the locking plate, a screw rod is installed under the power output shaft of the motor reduction mechanism, the lower end of the screw rod and the internally threaded opening at the rear end of the locking plate are threadedly connected, and the power switch is installed at the front upper end of the open slot; the force-sensitive resistor is installed at the front upper end of the locking plate, and the plug-in part of the charging gun head body is provided at the rear end. The reset circuit comprises a touch sheet and a control subcircuit, the touch sheet is installed outside the shell, and the storage battery, the voltage stabilizing module, the trigger subcircuit and the control subcircuit are installed inside the shell; the power output end of the voltage stabilizing module is electrically connected to the two poles of the battery respectively, one pole of the battery is electrically connected to one end of the power switch and one end of the power input of the control subcircuit, the other end of the power switch is electrically connected to the power input end of the trigger subcircuit and one end of the force-sensitive resistor, and the other end of the force-sensitive resistor is electrically connected to the signal input end of the trigger subcircuit; the power output ends of the trigger subcircuit and the control subcircuit are electrically connected to the two ends of the power input of the motor reduction mechanism respectively, and the touch sheet is electrically connected to the signal input end of the control subcircuit.

[0006] Furthermore, the voltage stabilizing module is a DC-to-DC switching power supply module.

[0007] Furthermore, the width of the locking sheet is smaller than the width of the opening slot, and when the locking metal sheet is at the bottom dead center, its height is lower than the front end height of the opening slot, and when it is at the top dead center, its height is higher than the front end height of the opening slot.

[0008] Furthermore, the power switch is a micro inching type normally open contact micro switch.

[0009] Furthermore, the trigger subcircuit includes an electrically connected resistor, a relay and an NPN transistor, one end of the resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is connected to the negative power input terminal of the relay, the positive power input terminal of the relay and the positive control power input terminal are connected, and the emitter of the NPN transistor is connected to the negative control power input terminal of the relay.

[0010] Furthermore, the control subcircuit of the reset circuit includes an electrically connected field effect tube, an adjustable resistor, an NPN transistor, a capacitor, and a relay, and is electrically connected to the touch sheet. One end of the adjustable resistor is connected to the collector of the NPN transistor and the positive control power input terminal of the relay. The drain of the field effect tube is connected to the other end of the adjustable resistor and the base of the NPN transistor. The emitter of the NPN transistor is connected to the positive electrode of the capacitor and the positive power input terminal of the relay. The negative electrode of the capacitor is connected to the source of the field effect tube, the negative power input terminal of the relay and the negative control power input terminal. The touch sheet is connected to the gate of the field effect tube.

[0011] The beneficial effects of the present invention are as follows: when the present invention is used, the charging gun head body of the charging pile is inserted into the charging socket of the charging socket on the vehicle. In this way, the internal contacts of the power switch are closed, and after the trigger subcircuit is energized, it will drive the motor deceleration mechanism to drive the locking piece upward, so that the front upper end of the charging gun head body and the upper inner part of the charging socket can be in close contact. Under the action of the force-sensitive resistor, the locking piece will automatically stop moving upward after contacting the upper inner part of the charging socket, ensuring that the charging gun head body can be in close contact with the charging socket and has good conductivity during charging. Before removing the charging gun head body after charging is completed, the charger only needs to touch to control the locking piece to return to its position through the reset circuit, which facilitates the removal of the charging gun head body and realizes automatic control. Based on the above, the present invention has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a schematic diagram of the overall structure between the charging gun head body and the charging pile of the present invention;

[0014] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 3 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0016] Figure 1 , 2As shown in , 3, an intelligent charging gun head includes a charging gun head body 1, a battery G1, a voltage stabilizing module A, and also has a locking mechanism and a reset circuit; the locking mechanism includes a micro motor reduction mechanism M, a rectangular locking metal sheet 2, a micro power switch S, a force sensitive resistor RT and a trigger sub-circuit 3; the charging gun head body 1 has a concave rectangular opening groove 101 (0.7 cm high) from front to back in the middle of the plug-in part of the front end, and the charging gun head body 1 has a guide hole 102 that passes through the rear end of the opening groove from top to bottom in the middle of the plug-in part, the motor reduction mechanism M is vertically installed at the upper end of the guide hole 102 through a screw nut, the locking plate 2 is horizontally located in the opening groove, and the middle of the rear end of the locking plate 2 has an internal threaded opening 21, and the power output shaft of the motor reduction mechanism is vertically welded below There is a screw rod 4, the lower end of the screw rod 4 is threadedly connected to the internal threaded opening at the rear end of the locking plate 2, the charging gun head body 1 is provided with an opening in the middle of the upper end of the opening groove 101, the power switch S is glued in the opening with its button facing the front end; the lower end of the force-sensitive resistor RT is glued to the front upper end of the locking plate 2, the wire connected to the force-sensitive resistor RT is led out through the lower end of the locking plate 2 and led out to the outside through the guide hole 102 side, an annular hollow shell 5 is installed at the rear of the plug-in part of the upper front end of the charging gun head body, and the upper part of the motor reduction mechanism M is located in the shell; the reset circuit includes a touch sheet QM and a control sub-circuit 6, the touch sheet QM is glued to the outside of the middle of the upper end of the shell 5, and the battery G1, the voltage stabilizing module A, the trigger sub-circuit 3, and the control sub-circuit 6 are installed on the circuit board inside the shell 5.

[0017] Figure 1 , 2 As shown in 3, the battery G1 is a lithium battery of model 12V / 2Ah; the voltage stabilizing module A is a finished micro DC-to-DC switching power module of model HLK-PM01, with an output power of 2W (input DC 72V, output DC 12V). The width of the locking metal sheet 2 is smaller than the width of the opening slot. When the locking metal sheet 2 is at the lower dead point, its height is lower than the front upper end height of the opening slot 101, and when it is at the upper dead point, its height is higher than the front upper end height of the opening slot 101. The micro power switch S is a micro inching type normally open contact micro switch. When the charging gun head body 1 is inserted into the vehicle charging socket, the front end of the button of the micro switch S is against the inner front end of the charging socket and its internal contacts are closed. 7 is a charging pile.

[0018] Figure 1 , 2As shown in , 3, the trigger subcircuit includes a resistor R1, a relay K1 and an NPN transistor Q1 connected via circuit board wiring, one end of the resistor R1 is connected to the base of the NPN transistor Q1, the collector of the NPN transistor Q1 is connected to the negative power input terminal of the relay K1, the positive power input terminal of the relay K1 and the control power input terminal are connected, and the emitter of the NPN transistor Q1 is connected to the negative control power input terminal of the relay K1. The control subcircuit of the reset circuit includes a field effect transistor Q2, an adjustable resistor RP, an NPN transistor Q3, a capacitor C1, and a relay K2 connected through circuit board wiring, and is connected to the touch sheet QM through a wire. One end of the adjustable resistor RP is connected to the collector of the NPN transistor Q3 and the positive control power input end of the relay K2. The drain of the field effect transistor Q2 is connected to the other end of the adjustable resistor RP and the base of the NPN transistor Q3. The emitter of the NPN transistor Q3 is connected to the positive electrode of the capacitor C1 and the positive power input end of the relay K2. The negative electrode of the capacitor C1 is connected to the source of the field effect transistor Q2, the negative power input end of the relay K2 and the negative control power input end. The lower middle part of the touch sheet QM is connected to the gate of the field effect transistor Q2.

[0019] Figure 1 , 2 As shown in Figure 3, the power input terminals 1 and 2 of the voltage regulator module A are connected to the two power lines of the charging gun body through wires. The power output terminals 3 and 4 of the voltage regulator module A are connected to the two poles of the battery G1 through wires. The positive pole of the battery G1 is connected to one end of the power switch S and the positive power input terminal of the control sub-circuit, the positive power input terminal of the relay K2, through a wire. The other end of the power switch S is connected to the positive power input terminal of the trigger sub-circuit relay K1 and one end of the force-sensitive resistor RT through a wire. The other end of the force-sensitive resistor RT is connected to the other end of the signal input terminal resistor R1 of the trigger sub-circuit through a wire, and the negative pole of the battery G1 is connected to the emitter of the NPN transistor Q1 at the negative power input terminal of the trigger sub-circuit and the source of the field effect transistor Q2 at the negative power input terminal of the control sub-circuit through a wire. The two normally closed contact terminals of the power output terminal relay K1 of the trigger sub-circuit and the two normally open contact terminals of the power output terminal relay K2 of the control sub-circuit are connected to the positive and negative and negative and positive and negative power input terminals of the motor reduction mechanism M through wires.

[0020] Figure 1 , 2As shown in Figure 3, when the present invention is used, the owner inserts the charging gun head body 1 into the charging socket of the vehicle's charging socket. Normally, the DC power output by the charging pile enters the power input terminals 1 and 2 of the voltage regulator module A. Under the action of its internal circuit, the power output terminals 3 and 4 of the voltage regulator module A output a stable 12V DC power supply and enter the power input terminal of the battery G1 for floating charging of the battery G1 (including the control subcircuit of the touch sheet QM being powered on), thus ensuring the power supply needs of the trigger subcircuit and the control subcircuit. After the charging gun head body 1 is inserted into the charging socket of the electric vehicle, the front button of the power switch S will contact the front end of the charging socket, so that the internal contacts of the power switch S will be closed, and then the locking mechanism of the trigger subcircuit will be powered on. After the locking mechanism works, the relay K1 loses power in the initial state, and its control power input terminal and the normally closed contact terminal are closed. In this way, the positive and negative poles of the 12V power supply will enter the positive and negative power input terminals of the motor reduction mechanism M through the two control power input terminals and the two normally closed contact terminals of the relay K1. The motor reduction mechanism M is energized and works, and its power output shaft drives the screw rod 4 to rotate clockwise. The external thread of the screw rod 4 acts on the internal thread of the locking plate 2, and the locking plate 2 moves upward (the rectangular opening groove 101 limits the rectangular locking plate to prevent it from rotating). In this way, the front upper end of the locking plate 2 will contact the inner upper end of the charging socket, and the front upper end of the charging gun head body 1 is in close contact with the inner upper part of the charging socket, which can ensure that the charging gun head body 1 and the charging socket are tightly fitted during charging, preventing the charging gun head body 1 and the charging socket from having poor contact or falling off in extreme cases during charging. In the present invention, when the locking plate 2 is moving upward, the upper part of the force-sensitive resistor RP will contact the upper end of the charging socket of the vehicle. When the contact surface between the upper part of the locking plate 2 and the charging socket is insufficient, that is, the contact force is small, the force-bearing surface of the upper end of the force-sensitive resistor RT is relatively small and the resistance is large. In this way, the positive electrode of the 12V power supply enters the base voltage of the NPN transistor Q1 after the voltage is reduced and the current is limited by the force-sensitive resistor RT, and the voltage is lower than 0.7V. The cut-off relay K1 of the NPN transistor Q1 continues to lose power, and the motor reduction mechanism M continues to be powered on to drive the locking plate 2 to continue to move upward. When the contact surface between the upper part of the locking plate 2 and the charging socket is large, that is, the contact force between the upper part of the locking plate 2 (metal) and the charging socket is large, the force-bearing surface of the upper end of the force-sensitive resistor RT is relatively large and the resistance is small. In this way, the positive pole of the 12V power supply enters the NPN transistor Q1 after voltage reduction and current limiting by the force-sensitive resistor RT, and the base voltage is higher than 0.7V. The collector of the NPN transistor Q1 is turned on and the output low level enters the negative power input terminal of the relay K1. When the relay K1 is energized, its control power input terminal and the normally closed contact terminal are open. Then, the motor reduction mechanism M loses power and no longer drives the locking plate 2 upward, ensuring that the locking plate 2 and the charging socket are under sufficient contact force, and preventing the locking plate 2 from being damaged or unable to work normally due to excessive upward distance.

[0021] Figure 1 , 2As shown in Figure 3, when the owner's finger does not touch the touch sheet QM, the field effect tube Q2 is in a zero bias state, and the resistance between its drain and source is small. The voltage output by the drain of the field effect tube Q2 enters the base of the NPN transistor Q3 and is lower than 0.7V. The NPN transistor Q3 is cut off, and the relay K2 will not be energized and attracted. After the electric vehicle is fully charged and the charger removes the charging gun head body 1, the charger touches the metal sheet QM with his finger, so that the clutter signal induced by the human body will enter the gate of the field effect tube Q2, and the field effect tube Q2 is no longer in a zero bias state, and the resistance between its drain and source is large. The voltage output by the drain of the field effect tube Q2 enters the base of the NPN transistor Q3 and is higher than 0.7V. The NPN transistor Q3 turns on the emitter to output a high level and enters the positive power input terminal of the relay K2 (filtering function of the capacitor C1), and the relay K2 is energized and attracted, and its two control power input terminals and two normally open contact terminals are closed respectively. Since the two normally open contact ends of the relay K2 are respectively connected to the negative and positive power input ends of the motor reduction mechanism M, the power output shaft of the motor reduction mechanism M drives the screw 4 to rotate counterclockwise after it is energized, and the external thread of the screw 4 acts on the internal thread of the locking plate 2, so that the locking plate 2 moves downward, so that the upper end of the locking plate 2 will be spaced apart from the inner upper end of the charging socket, and the front upper end of the charging gun head body 1 and the inner upper part of the charging socket are no longer in contact, so that the charger can easily remove the charging gun head body 1, thereby realizing automatic control. Figure 3 Among them, the resistance of resistor R1 is 1K; the model of NPN transistors Q1 and Q3 is 9014; the model of field effect tube Q2 is 3DJ6; the model of capacitor C1 is 10μF / 25V; the model of adjustable resistor is 10K; the model of relays K1 and K2 is DC12V; the model of force sensitive resistor RT is IMS-C04N; the motor reduction mechanism M is a micro coaxial motor gear reducer with a power of 1W.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0023] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An intelligent charging gun head, comprising a charging gun head body, a battery, and a voltage stabilizing module, characterized in that It also has a locking mechanism and a reset circuit; the locking mechanism includes a motor reduction mechanism, a locking plate, a power switch, a force-sensitive resistor and a trigger sub-circuit; there is an open slot on the plug-in part of the charging gun head body, and a vertically penetrating guide hole is provided at the rear end of the open slot, the motor reduction mechanism is installed at the upper end of the guide hole, the locking plate is located in the open slot, and an internal threaded opening is provided at the rear end of the locking plate. A screw rod is installed at the lower end of the power output shaft of the motor reduction mechanism, and the lower end of the screw rod and the internal threaded opening at the rear end of the locking plate are threadedly connected, and the power switch is installed at the front upper end of the open slot; the force-sensitive resistor is installed at the front upper end of the locking plate, and a shell is installed at the rear of the plug-in part of the charging gun head body; the reset circuit includes a touch sheet and a control sub-circuit, the touch sheet is installed outside the shell, and the battery, The voltage stabilizing module, the trigger subcircuit and the control subcircuit are installed in the shell; the power output end of the voltage stabilizing module is electrically connected to the two poles of the battery respectively, one pole of the battery is electrically connected to one end of the power switch and one end of the power input of the control subcircuit, the other end of the power switch is electrically connected to the power input end of the trigger subcircuit and one end of the force-sensitive resistor, and the other end of the force-sensitive resistor is electrically connected to the signal input end of the trigger subcircuit; the power output ends of the trigger subcircuit and the control subcircuit are electrically connected to the two ends of the power input of the motor reduction mechanism respectively, and the touch sheet is electrically connected to the signal input end of the control subcircuit.

2. The intelligent charging gun head according to claim 1, characterized in that: The voltage stabilizing module is a DC to DC switching power supply module.

3. The intelligent charging gun head according to claim 1, characterized in that: The width of the locking sheet is smaller than the width of the opening slot. When the locking metal sheet is at the lower dead point, its height is lower than the front end height of the opening slot, and when it is at the upper dead point, its height is higher than the front end height of the opening slot.

4. The intelligent charging gun head according to claim 1, characterized in that: The power switch is a miniature inching type normally open contact micro switch.

5. The intelligent charging gun head according to claim 1, characterized in that: The trigger subcircuit includes an electrically connected resistor, a relay and an NPN transistor, one end of the resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is connected to the negative power input terminal of the relay, the positive power input terminal of the relay and the positive control power input terminal are connected, and the emitter of the NPN transistor is connected to the negative control power input terminal of the relay.

6. The intelligent charging gun head according to claim 1, characterized in that: The control subcircuit of the reset circuit includes an electrically connected field effect tube, an adjustable resistor, an NPN transistor, a capacitor, and a relay, and is electrically connected to the touch sheet. One end of the adjustable resistor is connected to the collector of the NPN transistor and the positive control power input terminal of the relay. The drain of the field effect tube is connected to the other end of the adjustable resistor and the base of the NPN transistor. The emitter of the NPN transistor is connected to the positive electrode of the capacitor and the positive power input terminal of the relay. The negative electrode of the capacitor is connected to the source of the field effect tube, the negative power input terminal of the relay and the negative control power input terminal. The touch sheet is connected to the gate of the field effect tube.

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