WO2021072884A1 - Ligne électrique de charge et de décharge bidirectionnelles et circuit de charge et de décharge bidirectionnelles - Google Patents

Ligne électrique de charge et de décharge bidirectionnelles et circuit de charge et de décharge bidirectionnelles Download PDF

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Publication number
WO2021072884A1
WO2021072884A1 PCT/CN2019/118816 CN2019118816W WO2021072884A1 WO 2021072884 A1 WO2021072884 A1 WO 2021072884A1 CN 2019118816 W CN2019118816 W CN 2019118816W WO 2021072884 A1 WO2021072884 A1 WO 2021072884A1
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Prior art keywords
electrically connected
circuit
voltage
detection
interface
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PCT/CN2019/118816
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English (en)
Chinese (zh)
Inventor
孙中伟
黄少葵
褚艳秋
张培新
米宏伟
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深圳市华宝新能源股份有限公司
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Publication of WO2021072884A1 publication Critical patent/WO2021072884A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits

Definitions

  • the present invention relates to the technical field of electrical circuits, in particular to a bidirectional charging and discharging power cord and a bidirectional charging and discharging circuit.
  • the existing DC power cords usually only have a one-way charging function, and there are no control buttons on the power cords, so bidirectional charging and discharging functions cannot be realized.
  • the main purpose of the present invention is to provide a bidirectional charging and discharging power cord and a bidirectional charging and discharging circuit, so that the power cord can have a bidirectional charging and discharging function.
  • the present invention provides a power cord for electrical connection with an external DC power supply and a battery.
  • the power cord includes: a first interface, a second interface, a number of transmission lines, and an auxiliary detection circuit;
  • the detection circuit includes a first voltage dividing element and a first switching element;
  • the first interface is electrically connected to the second interface through a plurality of transmission lines, and one of the plurality of transmission lines is connected to a ground terminal;
  • the second interface includes a control terminal, and the control terminal of the second interface is electrically connected to the first terminal of the first switching element and the first terminal of the first voltage dividing element, respectively;
  • the second end of the first switching element is electrically connected to the ground end
  • the second end of the first voltage dividing element is electrically connected to the ground end.
  • the first switch element is a button, and the button is used to generate a low-level signal after being continuously pressed.
  • the time that the key is continuously pressed each time is at least two seconds.
  • the present invention also provides a bidirectional charging and discharging circuit, including a power cord, a third interface, a battery, and a protection circuit.
  • the bidirectional charging and discharging circuit is electrically connected to the power cord through a third interface, and the bidirectional charging and discharging circuit includes
  • the detection circuit and the control circuit are electrically connected in sequence, the power line adopts the above power line;
  • the detection circuit includes a detection chip, an interface detection circuit, an input/output port voltage detection circuit, and a battery voltage detection circuit, the interface detection circuit and
  • the detection chip is electrically connected to detect whether a power cord is connected to the third interface, and the input/output port voltage detection circuit is electrically connected to the detection chip to detect the value of the input/output port voltage,
  • the battery voltage detection circuit is electrically connected to the detection chip for detecting the value of the battery voltage
  • the protection circuit is electrically connected to the battery.
  • the interface detection circuit includes a second voltage dividing element, a first end of the second voltage dividing element is connected to a working voltage, and a second end of the second voltage dividing element is respectively connected to the power line
  • the control terminal and the first detection terminal of the detection chip are electrically connected to detect whether there is a power cord connection through the detection chip;
  • the input/output port voltage detection circuit includes a third voltage dividing element, a fourth voltage dividing element, and a first filter element;
  • the first end of the third voltage dividing element is electrically connected to the voltage end of the input/output port, and the second end of the third voltage dividing element is connected to the first end of the first filter element, and the second end of the fourth voltage dividing element.
  • One end is electrically connected to the second detection end of the detection chip, and the second end of the first filter element and the second end of the fourth voltage divider element are both connected to the ground end.
  • the battery voltage detection circuit includes a fifth voltage dividing element, a sixth voltage dividing element, and a second filter element;
  • the first end of the fifth voltage dividing element is electrically connected to the positive electrode of the battery, the second end of the fifth voltage dividing element is connected to one end of the sixth voltage dividing element, one end of the second filter element, and the detection chip
  • the third detection end is electrically connected, and the second end of the sixth voltage divider element and the second end of the second filter element are both connected to the ground end.
  • control circuit includes a control chip, a second switching element, a third switching element, and several output circuits.
  • the power line and the battery pass through the control chip, the second switching element, and the first switching element.
  • Three switch elements are electrically connected, and the control chip is electrically connected to a plurality of output circuits to form current output ports of different grades through the plurality of output circuits;
  • the control chip includes a first control terminal, the first control terminal is electrically connected with the detection chip, the control chip is electrically connected with the button, and the transmission direction of the power line current is switched by pressing the button.
  • the plurality of output circuits include a first step-down circuit and a second step-down circuit connected to the output terminal of the control chip;
  • the first step-down circuit and the second step-down circuit are both RC circuits (Resistance-Capacitance Circuits, phase shift circuits).
  • the first step-down circuit includes a seventh voltage divider element, a third filter element, the first end of the seventh voltage divider element, the first end of the third filter element, and the output of the control chip
  • the second end of the seventh voltage divider element and the second end of the third filter element are both connected to the ground end;
  • the second step-down circuit includes an eighth voltage divider element and a fourth filter element, and the first end of the eighth voltage divider element and the first end of the fourth filter element are electrically connected to the output end of the control chip, The second end of the eighth voltage divider element and the second end of the fourth filter element are both connected to a ground end.
  • the several output circuits further include a third step-down circuit and a fourth step-down circuit;
  • the third step-down circuit includes a ninth voltage dividing element and a fourth switching element.
  • the first end of the ninth voltage dividing element is electrically connected to the first end of the fourth filter element.
  • the second end is connected to the input end of the fourth switch element, the second end of the fourth switch element is connected to the ground end, and the control end of the fourth switch element is electrically connected to the detection chip;
  • the fourth step-down circuit includes a tenth voltage element and a fifth switch element.
  • the first end of the tenth voltage element is electrically connected to the first end of the fourth filter element.
  • the second end is connected to the input end of the fifth switch element, the second end of the fifth switch element is connected to the ground end, and the control end of the fifth switch element is electrically connected to the detection chip.
  • the second interface of the power cord is provided with a control terminal, and a button is electrically connected between the control terminal and the ground terminal. Press the button to generate a low-level signal.
  • the control chip receives the low-level signal, it is used to switch the power line to the charging or discharging state through the cooperation of several switches, so that the battery charging and discharging process can be completed without switching the power line and interface Conversion between.
  • FIG. 1 is a system block diagram of a bidirectional charging and discharging circuit and power line provided by an embodiment of the present invention
  • FIG. 2 is a circuit diagram of the power cord of FIG. 1;
  • FIG. 3 is a circuit diagram of the detection circuit of FIG. 1;
  • Fig. 4 is a circuit diagram of the control circuit of Fig. 1;
  • Fig. 5 is a circuit diagram of the protection circuit of Fig. 1.
  • the present invention provides a bidirectional charging and discharging circuit 20.
  • the bidirectional charging and discharging circuit 20 includes a detection circuit 21 and a control circuit 22.
  • the detection circuit 21 is electrically connected to the control circuit 22 and the power line 10, respectively.
  • the control circuit 22 is electrically connected to the battery 30, and the battery 30 is also electrically connected to the protection circuit 40.
  • the power line 10 adopts a bidirectional charging and discharging power line, through the bidirectional charging and discharging power line, the detection circuit 21 and the control circuit 22 With the cooperation, the state of the power cord is switched to the charging state or the discharging state, so that the conversion between the charging state and the discharging state of the battery can be completed without replacing the power cord and interface.
  • an embodiment of the present invention provides a power cord 10, which is a bidirectional charging and discharging power cord in this embodiment.
  • the power cord 10 can also be used as a power cord for only one-way charging or only one-way discharge; the power cord 10 is used to realize the electrical connection between an external DC power supply and the bidirectional charging and discharging circuit 20; the power cord 10 includes a first interface 11.
  • the second interface 12, a number of transmission lines, and an auxiliary detection circuit 13 the first interface 11 and the second interface 12 are electrically connected by a number of transmission lines, and one of the transmission lines is connected to a ground terminal, preferably, The number of several transmission lines is two, and the first interface 11 and the second interface 12 transmit electric energy through the two transmission lines.
  • the auxiliary detection circuit 13 includes a first voltage dividing element and a first switching element; More specifically, the first interface 11 includes a positive terminal 1 and a negative terminal 2; the second interface 12 includes a positive terminal 1, a negative terminal 2, and a control terminal 3; The positive terminal 1 and the negative terminal 2 of an interface 11 are electrically connected for power transmission, and the control terminal 3 of the second interface 12 is connected to the auxiliary detection circuit 13.
  • the first voltage dividing element is a resistor.
  • the first switch element is the button S1;
  • the control terminal 3 of the second interface 12 is electrically connected to the first end of the button S1 and the first end of the resistor R9, and the second end of the button S1 and the resistor R9 are both Grounding; by continuously pressing the button S1 to generate a low-level signal through the button S1, more specifically, each time the button S1 is continuously pressed for at least two seconds.
  • the detection circuit 21 includes a detection chip U1, an interface detection circuit 211, an input/output port voltage detection circuit 212, and a battery voltage detection circuit 213.
  • the interface detection circuit 211 is electrically connected to the detection chip U1
  • the input/output port voltage detection circuit 212 is electrically connected to the detection chip U1 for detecting the value of the input/output port voltage
  • the voltage detection circuit 213 is electrically connected to the detection chip U1 for detecting the voltage value of the battery 30.
  • the interface detection circuit 211 includes a second voltage dividing element; in one embodiment, the second voltage dividing element is a resistor R10, and the first end of the resistor R10 is connected to the working voltage, and the resistor R10
  • the second end of the power line 10 is electrically connected to the control end of the power line 10 and the first detection end of the detection chip U1 to detect whether the power line 10 is connected through the detection chip U1; specifically, the detection circuit 21 is electrically connected to the power line 10 and the control circuit 22. After the detection circuit 21 is electrically connected to the power line 10, after the detection end of the detection circuit 21 is electrically connected to the auxiliary detection circuit 13 of the power line 10, The level signal of the detection terminal of the detection circuit 21 is sent to the control circuit 22 through the detection circuit 21.
  • the input/output port voltage detection circuit 212 includes a third voltage dividing element, a fourth voltage dividing element, and a first filter element.
  • the third voltage dividing element is a resistor R1
  • the fourth voltage dividing element is a resistor R2
  • the first filter element is a capacitor C1.
  • the first end of the resistor R1 is electrically connected to the voltage end of the input/output port
  • the second end of the resistor R1 is connected to the first end of the capacitor C1, the first end of the resistor R2, and the second end of the detection chip U1.
  • the detection terminal is electrically connected
  • the second terminal of the capacitor C1 and the second terminal of the resistor R2 are both connected to the ground terminal.
  • the battery voltage detection circuit 213 includes a fifth voltage dividing element, a sixth voltage dividing element, and a second filter element; in an embodiment, the fifth voltage dividing element is a resistor R3, and the sixth voltage dividing element is a resistor R3.
  • the voltage element is a resistor R5, the second filter element is a capacitor C3; the first end of the resistor R3 is electrically connected to the positive electrode of the battery, and the second end of the resistor R3 is connected to one end of the resistor R5 and the capacitor C3.
  • One end is electrically connected to the third detection end of the detection chip U1, and the second end of the resistor R5 and the second end of the capacitor C3 are both connected to the ground end.
  • node a is electrically connected to the positive terminal of the third interface J1, that is, the positive connection end of the DC power supply.
  • Nodes b, c, and d are electrically connected to the resistor R14, resistor R15, and resistor R16, respectively, and then to the detection chip U1.
  • Pin 19, pin 18, and pin 17 are electrically connected;
  • the second interface 12 of the power cord 10 is connected to the third interface J1 (that is, the input/output port) of the bidirectional charging and discharging circuit 20, and the resistor R9 in the auxiliary detection circuit 13 It is connected to the resistor R10 on the detection circuit 21. Because the resistance value of R9 is less than the sum of R9+R10, the pin 1 of the detection chip U1 detects a low level, so the detection chip U1 is awakened and enters the working state;
  • the pin 20 of the detection chip U1 is the AD analog-to-digital conversion interface, and continuously detects the divided voltage value of the resistor R9 and the resistor R10; according to the known voltage of the resistor R10 is 5V, the resistance of the resistor R10 is passed through the AD
  • the detected voltage dividing value of the resistor R9 and the resistor R10 can calculate the resistance value of the resistor R9, because the resistance value of the resistor R9 represents a specific power line 10; specifically: the resistor R9 includes the first resistor R91 and the first resistor R91 Two resistors R92, the power line 10 includes the first resistor R91 and the second resistor R92 respectively to form a first power line and a second power line; for only one-way (only charging or only discharging) work
  • a device, such as a charger can remove the button S1, that is, use the first power cord (charging only) or the second power cord (discharging only).
  • the first power cord is a unidirectional charging power source
  • the second power line is a unidirectional discharge power line
  • the third embodiment for devices that need to work in both directions (both charging and discharging), such as products with batteries 30, cars
  • the power cord 10 of the car charger port needs to add a button S1, which is used to switch the charging and discharging direction, that is, the third power cord is used.
  • the third power cord is a bidirectional power cord; according to the type of the power cord 10, that is It can be determined that the power line 10 only has a one-way input or output function, or has both input and output functions (for example, a product with a battery 30) and the current capacity of the power line 10; more specifically, the resistor R9 includes the first The resistor R91, the second resistor R92 and the third resistor R93.
  • the first resistor R91, the second resistor R92 and the third resistor R93 respectively correspond to the first power line, the second power line and the third power line;
  • the first power line is defined as Vehicle charger, and set the output circuit to output 10A charging current;
  • define the second power line as the charger, set it to 3A charging current; if it’s a solar panel, set it to 20A charging current; define the third
  • the power line is a two-way vehicle charger.
  • the control circuit 22 includes a control chip U2, a second switching element Q4, a third switching element Q7, a sixth switching element Q6, a seventh switching element Q5, and a number of output circuits 221; in one embodiment,
  • the second switching element Q4, the third switching element Q7, the sixth switching element Q6, and the seventh switching element Q5 are all NMOS transistors, and the node a is electrically connected to the D pole (drain) of the second switching element Q4 through a resistor R27 ,
  • the S pole (source) of the second switching element Q4 is electrically connected to the D pole of the seventh switching element Q5 and the first end of the inductor L1, and the G pole (source) of the second switching element Q4 is electrically connected to the control chip U2,
  • the second end of the inductor L1 is electrically connected to the D pole of the sixth switching element Q6 and the S pole of the third switching element Q7; the S pole of the seventh switching element Q5 is grounded and the 25th pin of the control chip U2,
  • the control chip U2 is electrically connected to the detection chip U1, the second switching element Q4, and the third switching element Q7, respectively, and the control chip U2 is electrically connected to a plurality of output circuits to be formed by a plurality of output circuits 221 Different grades of current output ports; specifically, the control circuit 22 is connected to the power line 10 through the third interface J1 for detecting the resistance value of the resistor R9 in the auxiliary detection circuit 13 to determine the power supply
  • the type of the line 10 the first detection terminal of the detection chip U1 is also connected to the DC power supply terminal through a resistor R10; the third interface J1 of the bidirectional charging and discharging circuit 20 is switched between the input port and the output port, reducing product interfaces, Reduce the number of circuit modules and save costs.
  • node b is connected to pin 1 (that is, the CE terminal) of the control chip U2, and the CE pin works when it is at a low level and turns off when it is at a high level;
  • node c is connected to the pin 2 of the control chip U2 (that is, the Dir terminal). )
  • the node d is connected to the pin 4 of the control chip U2 (that is, the PG terminal), and the node V of the 24th pin of the control chip U2 is connected to the +5V power supply;
  • control circuit 22 includes a control chip U2 and a number of output circuits.
  • the output current values between the output circuits are not equal and are used to output different charging currents.
  • the control chip U2 and the detection chip and a number of output circuits The circuit is electrically connected, and the control chip U2 receives the level signal of the detection terminal of the detection circuit 21 to control the connection or disconnection of several output circuits.
  • Pin 2 of the control chip U2 (that is, the DIR terminal) is the charging and discharging mode setting pin, this pin is set to low level, that is, the charging mode; if the pin 2 of the control chip U2 is set to The high level is the discharge mode; the control chip U2 works simultaneously with the second switching element Q4, the third switching element Q7, the sixth switching element Q6, and the seventh switching element Q5 to realize the switching of the charging mode or the discharging mode; preferably, so
  • the model of the control chip U2 is SC8802QDER.
  • the charging current control principle Several output circuits include current output ports of different grades formed by a step-down circuit electrically connected to the output terminal of the control control chip U2; the step-down circuits all adopt RC parallel circuits.
  • the step-down circuit controls the charge and discharge current through the resistance of the ninth voltage divider, the ninth voltage divider, the eighth voltage divider, and the seventh voltage divider.
  • the tenth voltage component is a resistor.
  • the ninth voltage dividing element is a resistor R24
  • the eighth voltage dividing element is a resistor R28
  • the seventh voltage dividing element is a resistor R32; wherein the resistor R28 and the resistor R32 are the default current setting resistors; the resistor R28 ,
  • the resistor R32 is directly connected to GND, and the charging current is the first gear;
  • the resistor R21 and the resistor R24 are connected to GND, and the detection chip U1 controls the switch Q2 and controls the switch Q3 to turn on and off.
  • control The switch Q2 is an NMOS tube
  • control switch Q3 is an NMOS tube
  • the switch Q2 when the switch Q2 is turned on, the resistor R21 is short-circuited to GND, and the charging current increases to the second gear
  • the switch Q3 when the switch Q3 is turned on, the resistor R24 is short-circuited to GND, and the charging current Increase to third gear.
  • the pin 1 (that is, the CE terminal) of the control chip U2 is set to low level, that is, the charging operation is started, and the battery 30 is charged;
  • Pin 2 (that is, the DIR terminal) of the control chip U2 is the charging and discharging mode setting pin; this pin is set to high level to turn on the discharge mode;
  • the working principle of the discharging current the same as the control principle of the charging current mentioned above.
  • the pin 1 of the control chip U2 (that is, the CE end) is set to low level, that is, the discharging work is started.
  • the detection chip U1 detects the long press signal and transmits the long press signal to the control chip U2, and the control chip U2 After receiving the long press signal, the level signal of the first control terminal of the control chip U2 is set to a high level, and the current direction of the power line is transmitted from the second interface to the first interface. At this time, the direction of the current transmission of the power line is It is opposite to the one-way transmission of current. More specifically: the pin 20 of the detection chip U1 is an analog-to-digital conversion interface, and the voltage on the port is continuously detected.
  • the voltage on the pin 20 of the detection chip U1 drops to 0V or very close to 0V and lasts for two seconds.
  • the detection chip U1 detects this action and determines that the button S1 has a long press Action, it should be pointed out that if the time is less than 2 seconds or the voltage drop does not reach the 0V standard, it is considered that there is no long-press action; the long-press action is judged only when it is detected that the power line 10 has a bidirectional charging and discharging function; third
  • the power cord has a bidirectional function. One power cord can achieve two functions, reducing the number of power cords.
  • FIG. 5 is a circuit diagram of the protection circuit.
  • the node e in FIG. 5 that is, the positive terminal of the fuse protector FUSE1 is electrically connected to the node e in FIG. 4; the control circuit 22 is in turn connected with the protection circuit 40 And the battery 30 is electrically connected, and the protection circuit 40 is used to disconnect the battery 30 through the fuse protector FUSE1 when the battery 30 is abnormally charged or discharged, or cut off the four switches through the switch Q8 and the switch Q9 through the protection chip U3.
  • the electrical connection between the battery 30 and the control circuit 22, specifically, several control terminals of the protection circuit 40 are respectively electrically connected to the positive and negative electrodes of the battery; the protection circuit 40 is a battery management system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne une ligne électrique de charge et de décharge bidirectionnelles et un circuit de charge et de décharge bidirectionnelles. La ligne électrique comprend : une première interface, une seconde interface, plusieurs lignes de transmission et un circuit de détection auxiliaire; le circuit de détection auxiliaire comprend un premier élément de division de tension et un premier élément de commutation; la première interface est électriquement connectée à la seconde interface au moyen des multiples lignes de transmission, et l'une des multiples lignes de transmission est en outre connectée à une borne de mise à la terre; et la seconde interface comprend en outre une borne de commande, la borne de commande étant connectée électriquement à une première borne du premier élément de commutation et à une première borne du premier élément de division de tension. La solution technique fournie par la présente invention présente les avantages suivants: la borne de commande est disposée au niveau de la seconde interface de la ligne d'alimentation électrique, une clé est également connectée électriquement entre la borne de commande et la terre, et un signal de faible intensité est généré par pression sur la clé; et après réception du signal de faible intensité, une puce de commande U2 commute la ligne d'alimentation électrique vers un état de charge ou de décharge par la coopération de plusieurs commutateurs, de sorte qu'une batterie peut commuter entre les processus de charge et de décharge sans commuter la ligne d'alimentation électrique et les interfaces.
PCT/CN2019/118816 2019-10-16 2019-11-15 Ligne électrique de charge et de décharge bidirectionnelles et circuit de charge et de décharge bidirectionnelles WO2021072884A1 (fr)

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CN201910983870.8A CN110829517A (zh) 2019-10-16 2019-10-16 双向充放电的电源线以及双向充放电电路
CN201910983870.8 2019-10-16

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