A drive circuit applied to a charging pile

Abstract

The present invention relates to the technical field of charging piles, and particularly to a drive circuit applied to a charging pile. The present invention includes a voltage comparison output circuit, a push-pull stable output circuit, a connection success judgment circuit, a comparison judgment start circuit, and a judgment start charging circuit. In the present invention, the voltage comparison output circuit controls the voltage comparison to output a PWM wave to the push-pull stable output circuit. The push-pull stable output circuit stably outputs the PWM wave to the connection success judgment circuit. The connection success judgment circuit judges whether the connection is successful to start communication. The comparison judgment start circuit compares and judges whether to start outputting the PWM wave to the judgment start charging circuit. If it is found through comparison that the current is overcurrent, the comparison judgment start circuit cuts off the power and does not output the PWM wave. If everything is normal through comparison, the comparison judgment start circuit outputs the PWM wave to the judgment start charging circuit, thereby controlling the charging to be carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and particularly to a drive circuit applied to a charging pile. Background Art

[0002] A charging pile is similar to a fuel dispenser in a gas station. It can be fixed on the ground or wall and installed in public buildings (such as public buildings, shopping malls, public parking lots, etc.) and residential community parking lots or charging stations. It can charge various models of electric vehicles according to different voltage levels.

[0003] The input end of the charging pile is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging electric vehicles.

[0004] Generally, the charging pile provides two charging methods: conventional charging and fast charging. People can use a specific charging card to swipe on the man-machine interaction operation interface provided by the charging pile to perform operations such as corresponding charging methods, charging time, and printing of cost data. The display screen of the charging pile can display data such as the charging amount, cost, and charging time.

[0005] The charging pile can achieve charging by timing, counting electricity degrees, and counting amounts. It can be used as a power purchase terminal for citizens. At the same time, to improve the efficiency and practicality of public charging piles, functions such as multiple charging for one pile and charging for electric bicycles will be gradually added in the future.

[0006] During the process of charging an electric vehicle by the charging pile, due to the large power, many safety problems will inevitably arise. How to reduce the potential safety hazards of charging is a matter of great concern to manufacturers. Summary of the Invention

[0007] In order to overcome the above-mentioned deficiencies, the purpose of the present invention is to provide a drive circuit applied to a charging pile, which enables stable communication and has overcurrent power-off protection to improve safety and stability.

[0008] The technical solution adopted by the present invention to solve its technical problems is:

[0009] A drive circuit applied to a charging pile is provided on a protection chip inside the charging pile. Among them, it includes a voltage comparison output circuit for controlling the output of a PWM wave to a push-pull stable output circuit, a push-pull stable output circuit for outputting a stable PWM wave to a connection success judgment circuit, a connection success judgment circuit for judging whether to start communication successfully, a comparison judgment start circuit for comparing and judging whether to start outputting a PWM wave to a judgment start charging circuit, and a judgment start charging circuit for judging whether to output alternating current.

[0010] As an improvement of the present invention, the voltage comparison output circuit includes a resistor R60, a resistor R61, a resistor R62, a capacitor C55, a capacitor C57, and a voltage comparator U8A; the second pin and the third pin of the voltage comparator U8A are input comparison terminals, the third pin of the voltage comparator U8A is respectively connected to one end of the resistor R61 and one end of the resistor R62, and the other end of the resistor R62 is grounded; the fourth pin of the voltage comparator U8A is connected to one end of the capacitor C55, and the other end of the capacitor C55 is grounded; the fifth pin of the voltage comparator U8A is respectively connected to one end of the capacitor C57 and one end of the resistor R60, and the other end of the resistor R60 is connected to the first pin of the voltage comparator U8A; the first pin of the voltage comparator U8A is connected to the push-pull stable output circuit.

[0011] As a further improvement of the present invention, the push-pull stable output circuit includes a triode Q17, a triode Q18, a resistor R58, a resistor R59, a resistor R64, a resistor R66, a capacitor C56, a diode D19, and a diode D20. The first pin of the voltage comparator U8A is connected to the anode of the diode D19 and the cathode of the diode D20. The cathode of the diode D19 is connected to one end of the resistor R59, the other end of the resistor R59 is connected to the base of the triode Q17, the collector of the triode Q17 is connected to one end of the resistor R58, the other end of the resistor R58 is connected to one end of the capacitor C56, the other end of the capacitor C56 is connected to one end of the resistor R66, the other end of the resistor R66 is connected to the collector of the triode Q18, the base of the triode Q18 is connected to one end of the resistor R64, the other end of the resistor R64 is connected to the anode of the diode D20, the emitter of the triode Q18 is connected to the emitter of the triode Q17, and the emitters of the triode Q18 and the triode Q17 are both connected to the connection success judgment circuit.

[0012] As a further improvement of the present invention, the connection success judgment circuit includes a resistor R88, a resistor R89, a capacitor C62, a capacitor C70, and a diode D18. One end of the resistor R88, one end of the resistor R89, and one end of the capacitor C70 are all connected to point A. Point A is connected to the push-pull stable output circuit. The other end of the resistor R89 and the other end of the capacitor C70 are both grounded. The other end of the resistor R88 is respectively connected to the cathode of the diode D18 and one end of the capacitor C62. The other end of the capacitor C62 is grounded. The anode of the diode D18 is connected to the comparison judgment start circuit.

[0013] As a further improvement of the present invention, the comparison and judgment startup circuit includes a resistor R86, a resistor R87, a resistor R95, a triode Q19, and a capacitor C61. One end of the resistor R86, one end of the resistor R95, and the collector of the triode Q19 are all connected to point B. Point B is connected to the connection success judgment circuit. The emitter of the triode Q19 is connected to one end of the capacitor C61. The other end of the capacitor C61 is respectively connected to the base of the triode Q19, one end of the resistor R87, and the other end of the resistor R86. The other end of the resistor R95 is connected to the judgment startup charging circuit.

[0014] As a further improvement of the present invention, the judgment startup charging circuit includes a triode Q12, a triode Q18, a voltage comparator U8B, a zener diode D13, a diode D20, resistors R63, R64, R65, R66, R67, R71, R72, R74, R121, and a capacitor C59; One end of the resistor R121 is connected to the comparison and judgment startup circuit. The other end of the resistor R121 is respectively connected to the 7th pin of the voltage comparator U8B and one end of the resistor R72. The other end of the resistor R72 is respectively connected to one end of the capacitor C59 and the base of the triode Q12. The other end of the capacitor C59 is connected to the emitter of the triode Q12. The collector of the triode Q12 is connected to the resistor R67. The 5th pin of the voltage comparator U8B is respectively connected to the resistors R74 and R71. The 6th pin of the voltage comparator U8B is connected to one end of the resistor 65. The other end of the resistor R65 is respectively connected to one end of the zener diode D13, the output terminal CN2, and one end of the resistor R63. The other end of the resistor R63 is connected to the emitter of the triode Q18. The collector of the triode Q18 is connected to the resistor R66. The base of the triode Q18 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to the diode D20. The other end of the zener diode D13 is connected to the output terminal CN11.

[0015] In the present invention, the voltage comparison output circuit controls the voltage comparison to output a PWM wave to the push - pull stable output circuit. The push - pull stable output circuit stably outputs the PWM wave to the connection success judgment circuit. The connection success judgment circuit judges whether the connection is successful to start communication. The comparison and judgment startup circuit compares and judges whether to start outputting the PWM wave to the judgment startup charging circuit. If it is found through comparison that the current is over - current, the comparison and judgment startup circuit cuts off the power and does not output the PWM wave; If everything is normal through comparison, the comparison and judgment startup circuit outputs the PWM wave to the judgment startup charging circuit, thereby controlling the charging; The present invention enables stable communication and also provides over - current power - off protection, improving safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For ease of explanation, the present invention is described in detail by the following preferred embodiments and accompanying drawings.

[0017] Figure 1 This is the circuit diagram of the voltage comparison output circuit of the present invention;

[0018] Figure 2 This is the circuit diagram of the push-pull stable output circuit of the present invention;

[0019] Figure 3 This is the connection circuit diagram of the connection success judgment circuit, comparison judgment start circuit, and judgment start charging circuit of the present invention;

[0020] Reference numerals: 1 - voltage comparison output circuit, 2 - push-pull stable output circuit, 3 - connection success judgment circuit, 4 - comparison judgment start circuit, 5 - judgment start charging circuit. Detailed implementation manners

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Such as Figure 1 、 Figure 2 and Figure 3As shown in the figure, a drive circuit applied to a charging pile in the present invention is provided on a protection chip inside the charging pile, and includes a voltage comparison output circuit 1 for controlling voltage comparison to output a PWM wave to a push-pull stable output circuit 2, a push-pull stable output circuit 2 for outputting a stable PWM wave to a connection success judgment circuit 3, a connection success judgment circuit 3 for judging whether connection is successful to start communication, a comparison judgment start circuit 4 for comparing and judging whether to start outputting a PWM wave to a judgment start charging circuit 5, and a judgment start charging circuit 5 for judging whether to output alternating current.

[0025] In the present invention, the voltage comparison output circuit 1 controls voltage comparison to output a PWM wave to the push-pull stable output circuit 2, the push-pull stable output circuit 2 stably outputs a PWM wave to the connection success judgment circuit 3, the connection success judgment circuit 3 judges whether connection is successful to start communication, the comparison judgment start circuit 4 compares and judges whether to start outputting a PWM wave to the judgment start charging circuit 5. If it is found through comparison that the current is overcurrent, the comparison judgment start circuit 4 cuts off the power and does not output a PWM wave; if everything is normal through comparison, the comparison judgment start circuit 4 outputs a PWM wave to the judgment start charging circuit 5, thereby controlling charging.

[0026] As Figure 1 shown in the figure, an embodiment of the voltage comparison output circuit 1 is provided in the present invention. The voltage comparison output circuit 1 includes a resistor R60, a resistor R61, a resistor R62, a capacitor C55, a capacitor C57, and a voltage comparator U8A. The second and third pins of the voltage comparator U8A are input comparison terminals. The third pin of the voltage comparator U8A is respectively connected to one end of the resistor R61 and one end of the resistor R62, and the other end of the resistor R62 is grounded. The fourth pin of the voltage comparator U8A is connected to one end of the capacitor C55, and the other end of the capacitor C55 is grounded. The fifth pin of the voltage comparator U8A is respectively connected to one end of the capacitor C57 and one end of the resistor R60, and the other end of the resistor R60 is connected to the first pin of the voltage comparator U8A. The first pin of the voltage comparator U8A is connected to the push-pull stable output circuit.

[0027] As Figure 2As shown in the figure, the present invention provides an embodiment of the push-pull stable output circuit 2. The push-pull stable output circuit 2 includes a triode Q17, a triode Q18, a resistor R58, a resistor R59, a resistor R64, a resistor R66, a capacitor C56, a diode D19, and a diode D20. The first pin of the voltage comparator U8A is connected to the anode of the diode D19 and the cathode of the diode D20. The cathode of the diode D19 is connected to one end of the resistor R59. The other end of the resistor R59 is connected to the base of the triode Q17. The collector of the triode Q17 is connected to one end of the resistor R58. The other end of the resistor R58 is connected to one end of the capacitor C56. The other end of the capacitor C56 is connected to one end of the resistor R66. The other end of the resistor R66 is connected to the collector of the triode Q18. The base of the triode Q18 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to the anode of the diode D20. The emitter of the triode Q18 is connected to the emitter of the triode Q17. The emitters of the triode Q18 and the triode Q17 are both connected to the connection success judgment circuit.

[0028] As Figure 3 shown in the figure, the present invention provides an embodiment of the connection success judgment circuit 3. The connection success judgment circuit 3 includes a resistor R88, a resistor R89, a capacitor C62, a capacitor C70, and a diode D18. One end of the resistor R88, one end of the resistor R89, and one end of the capacitor C70 are all connected to point A. Point A is connected to the push-pull stable output circuit. The other end of the resistor R89 and the other end of the capacitor C70 are both grounded. The other end of the resistor R88 is respectively connected to the cathode of the diode D18 and one end of the capacitor C62. The other end of the capacitor C62 is grounded. The anode of the diode D18 is connected to the comparison judgment start circuit.

[0029] The comparison judgment start circuit 4 includes a resistor R86, a resistor R87, a resistor R95, a triode Q19, and a capacitor C61. One end of the resistor R86, one end of the resistor R95, and the collector of the triode Q19 are all connected to point B. Point B is connected to the connection success judgment circuit. The emitter of the triode Q19 is connected to one end of the capacitor C61. The other end of the capacitor C61 is respectively connected to the base of the triode Q19, one end of the resistor R87, and the other end of the resistor R86. The other end of the resistor R95 is connected to the judgment start charging circuit.

[0030] The determination start charging circuit 5 includes a triode Q12, a triode Q18, a voltage comparator U8B, a zener diode D13, a diode D20, a resistor R63, a resistor R64, a resistor R65, a resistor R66, a resistor R67, a resistor R71, a resistor R72, a resistor R74, a resistor R121, and a capacitor C59; one end of the resistor R121 is connected to the comparison determination start circuit, and the other end of the resistor R121 is respectively connected to the 7th pin of the voltage comparator U8B and one end of the resistor R72. The other end of the resistor R72 is respectively connected to one end of the capacitor C59 and the base of the triode Q12. The other end of the capacitor C59 is connected to the emitter of the triode Q12. The collector of the triode Q12 is connected to the resistor R67. The 5th pin of the voltage comparator U8B is respectively connected to the resistor R74 and the resistor R71. The 6th pin of the voltage comparator U8B is connected to one end of the resistor 65. The other end of the resistor R65 is respectively connected to one end of the zener diode D13, the output terminal CN2, and one end of the resistor R63. The other end of the resistor R63 is connected to the emitter of the triode Q18. The collector of the triode Q18 is connected to the resistor R66. The base of the triode Q18 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to the diode D20. The other end of the zener diode D13 is connected to the output terminal CN11.

[0031] Inside the comparison determination start circuit 4, the connection success determination circuit 3, and the determination start charging circuit 5, the output terminal CN2 and the output terminal CN11 are connected to an external electric vehicle interface through a terminal. When the connection is successful, a low level is connected to the cc terminal. At this time, the triode Q19 is cut off, and the detection point PETEX detects a high voltage, allowing communication. Otherwise, communication is not allowed. In the case where communication is allowed when the connection is successful, the voltage at the cp detection point is 9 volts. Through the voltage comparator U8B, a positive 13-volt voltage is output. After being connected to the base of the triode Q12, it forms a switch. At this time, the triode Q12 is turned on, and the 9vDetection detection point is at a low voltage, starting the PWM wave. The push-pull stable output circuit 2 outputs a positive and negative 9-volt PWM wave. If the external connection communication starts the charging permission state at this time, the cp detection point becomes a 6v PWM wave output. After passing through the determination start charging circuit 5, a voltage of 0 to 1.22v is output. The detection point is connected to the voltage comparator U8A in the voltage comparison output circuit 1 to form a window comparator, which is compared with the 6v Detection detection point. Within this range, an alternating current of 32A is allowed to be output to charge the electric vehicle; other values outside the window comparison range do not allow charging or stop charging, making the charging safer and more reliable.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A drive circuit applied to a charging pile, which is arranged on a protection chip in the charging pile, and is characterized in that, It includes a voltage comparison output circuit for controlling the voltage comparison output PWM wave to a push-pull stable output circuit, a push-pull stable output circuit for outputting a stable PWM wave to a connection success judgment circuit, a connection success judgment circuit for judging whether to start communication successfully, a comparison judgment start circuit for comparing and judging whether to start outputting a PWM wave to a judgment start charging circuit, and a judgment start charging circuit for judging whether to output alternating current; The voltage comparison output circuit includes a resistor R60, a resistor R61, a resistor R62, a capacitor C55, a capacitor C57, and a voltage comparator U8A; the second and third pins of the voltage comparator U8A are input comparison terminals, the third pin of the voltage comparator U8A is respectively connected to one end of the resistor R61 and one end of the resistor R62, and the other end of the resistor R62 is grounded; the fourth pin of the voltage comparator U8A is connected to one end of the capacitor C55, and the other end of the capacitor C55 is grounded; the fifth pin of the voltage comparator U8A is respectively connected to one end of the capacitor C57 and one end of the resistor R60, and the other end of the resistor R60 is connected to the first pin of the voltage comparator U8A; the first pin of the voltage comparator U8A is connected to the push-pull stable output circuit; The push-pull stable output circuit includes a triode Q17, a triode Q18, a resistor R58, a resistor R59, a resistor R64, a resistor R66, a capacitor C56, a diode D19, and a diode D20. The first pin of the voltage comparator U8A is connected to the anode of the diode D19 and the cathode of the diode D20. The cathode of the diode D19 is connected to one end of the resistor R59, the other end of the resistor R59 is connected to the base of the triode Q17, the collector of the triode Q17 is connected to one end of the resistor R58, the other end of the resistor R58 is connected to one end of the capacitor C56, the other end of the capacitor C56 is connected to one end of the resistor R66, the other end of the resistor R66 is connected to the collector of the triode Q18, the base of the triode Q18 is connected to one end of the resistor R64, the other end of the resistor R64 is connected to the anode of the diode D20, the emitter of the triode Q18 is connected to the emitter of the triode Q17, and the emitters of the triode Q18 and the triode Q17 are both connected to the connection success judgment circuit; The connection success judgment circuit includes a resistor R88, a resistor R89, a capacitor C62, a capacitor C70, and a diode D18. One end of the resistor R88, one end of the resistor R89, and one end of the capacitor C70 are all connected to the 6v Detection point. The 6v Detection point is connected to the push-pull stable output circuit. The other end of the resistor R89 and the other end of the capacitor C70 are both grounded. The other end of the resistor R88 is respectively connected to the cathode of the diode D18 and one end of the capacitor C62. The other end of the capacitor C62 is grounded. The anode of the diode D18 is connected to the comparison judgment start circuit; The comparison and judgment startup circuit includes resistor R86, resistor R87, resistor R95, triode Q19 and capacitor C61. One end of resistor R86, one end of resistor R95, and the collector of triode Q19 are all connected to point B. Point B is connected to the connection success judgment circuit. The emitter of triode Q19 is connected to one end of capacitor C61. The other end of capacitor C61 is respectively connected to the base of triode Q19, one end of resistor R87, and the other end of resistor R86. The other end of resistor R95 is connected to the judgment startup charging circuit; The judgment startup charging circuit includes triode Q12, triode Q18, voltage comparator U8B, zener diode D13, diode D20, resistors R63, R64, R65, R66, R67, R71, R72, R74, R121 and capacitor C59; One end of resistor R121 is connected to the comparison and judgment startup circuit. The other end of resistor R121 is respectively connected to pin 7 of voltage comparator U8B and one end of resistor R72. The other end of resistor R72 is respectively connected to one end of capacitor C59 and the base of triode Q12. The other end of capacitor C59 is connected to the emitter of triode Q12. The collector of triode Q12 is connected to resistor R67. Pin 5 of voltage comparator U8B is respectively connected to resistors R74 and R71. Pin 6 of voltage comparator U8B is connected to one end of resistor 65. The other end of resistor R65 is respectively connected to one end of zener diode D13, output terminal CN2, and one end of resistor R63. The other end of resistor R63 is connected to the emitter of triode Q18. The collector of triode Q18 is connected to resistor R66. The base of triode Q18 is connected to one end of resistor R64. The other end of resistor R64 is connected to diode D20. The other end of zener diode D13 is connected to output terminal CN11; Output terminal CN2 and output terminal CN11 are connected to an external electric vehicle interface through terminals; The voltage comparison output circuit controls the voltage comparison to output a PWM wave to the push-pull stable output circuit. The push-pull stable output circuit stably outputs the PWM wave to the connection success judgment circuit. The connection success judgment circuit judges whether the connection is successful to start communication. The comparison and judgment startup circuit compares and judges whether to start outputting the PWM wave to the judgment startup charging circuit. If it is found through comparison that the current is overcurrent, the comparison and judgment startup circuit cuts off the power and does not output the PWM wave; If everything is normal through comparison, the comparison and judgment startup circuit outputs the PWM wave to the judgment startup charging circuit, thereby controlling the charging to proceed.

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