JP2012130174A - Charging system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: a conventional system, which starts charging after battery pack connection is detected and a charger outputs a charge control voltage to activate a battery control circuit for its communication with the charger using the battery pack and to reach a chargeable state, has such low safety that a high voltage is output from the charger under an erroneous detection state of the battery pack caused by foreign matter or the like.SOLUTION: The charging system includes a charger and a battery pack that are connected through positive/negative terminals and a communication terminal. After the connection detection of the battery pack, the charger outputs a low voltage to activate a battery control circuit for its communication with the charger using the battery pack and to reach a chargeable state. Subsequently, a high voltage required for charging is output to start charging.

Description

  The present invention relates to a charging system, and more particularly to a charging system including a multi-series charging battery and a charging device for charging the battery.

  A conventional charging system is shown in FIG. 4, and a conventional battery detection flow is shown in FIG. In FIG. 4, a battery pack 404 including a charging battery 401, a battery control circuit 402 and a charging / discharging switch 403 that controls charging / discharging of the charging battery 401, a battery pack 404 and positive / negative terminals, The battery connection detection terminal T and the communication terminal D are connected to each other, and the charging current and the charging control voltage for charging the charging battery 401 of the battery pack 404 are controlled by receiving power from the primary side circuit 405 of the AC / DC converter. Or a charging device 411 including a charge control circuit 407 that can control the operation of an output switch for supplying the output to the connected battery pack 404 or can communicate with the battery pack 404. Yes.

  In the conventional technology, when the battery pack 404 is connected to the charging device 411, the charge control circuit 407 detects the voltage by the pull-down resistor 408 provided between the battery connection detection terminal T and the negative electrode terminal − of the battery pack 404, The output switch 406 is turned on, the battery control circuit 402 of the battery pack 404 is activated by the output voltage of the charging device 411, and an activation signal is transmitted from the battery pack 404 to the charging device 411. And the charging device 411 detects a battery connection, and starts charge (for example, refer patent document 1).

JP 2010-130717 A

  Due to the widespread use of lithium ion storage batteries, devices using multi-series batteries as driving sources are increasing. Against this background, for example, the battery voltage of multiple series of 10 cells or more is 42V or more, so the output of the charging device must also output a high voltage of 42V or more. Is required.

  In the conventional charging system, the voltage is not output to the output terminal of the charging device until the connection of the battery pack is detected. However, if the terminal for detecting the battery connection is short-circuited by a foreign object or the like, the charging device It recognizes that it is connected and outputs a high voltage to the output terminal.

  There is also a charging system that communicates between a battery pack and a charging device to detect connection and control charging. However, the battery pack shuts down the battery control circuit in order to reduce the power consumption of the battery control circuit after a certain period of time.

  In this case, communication is not possible even when the battery pack is connected to the charging device, and connection detection of the battery pack cannot be performed. Therefore, the charging device must be provided with a battery connection detection terminal, and a high voltage is detected after detecting the connection. There was a problem that there was a risk of electric shock when it was output and touched with a hand.

  An object of this invention is to provide a highly safe charging system with respect to the battery detection operation | movement flow from the battery pack connection detection of a charging device to a charge start.

  In order to achieve the above object, a charging system according to the present invention includes a battery pack including a charging battery, a battery control circuit, a charging / discharging switch for controlling on / off of charging / discharging current of the charging battery, and the battery pack. / Connected at the negative electrode terminal and communication terminal, controls the charging current and charging control voltage for charging the charging battery of the battery pack by receiving power supply from the primary side circuit of the AC / DC converter, or connecting its output In a charging system including a charging device configured to control an operation of an output switch for supplying to a battery pack that has been connected or to communicate with the battery pack, the negative electrode of the battery pack A resistor is provided between the terminal and the communication terminal, a communication switch is provided between the communication terminal and the charge control circuit in the charging device, and the communication terminal is connected when the battery pack is connected. The resistance of the battery pack is detected, the communication switch is switched to the communication line side, the output switch is turned on, the battery control circuit of the battery pack is activated by the output voltage of the charging device, and the activation signal transmitted from the battery pack is After the charging control circuit of the charging device receives and the charger recognizes the connection of the battery pack, the battery control circuit turns on the charging / discharging switch of the battery pack and starts charging. .

  In addition, after the charging device recognizes the connection of the battery pack, the charging / discharging switch of the battery pack is turned on, and the output voltage of the charging device is started to be lower than the charging control voltage.

  In the charging system of the present invention, after the charging device detects the connection of the battery pack, the charging device outputs a low voltage, activates the battery control circuit, communicates with the charging device and the battery pack, and is in a chargeable state. After recognizing, the high voltage required for charging is output and charging is started. In this charging system, the battery pack connection detection of the charging device can also serve as a communication terminal. In addition, since the charging device after detecting the battery pack does not output a high voltage until it can be charged, it is possible to prevent a high voltage from being output due to erroneous detection due to adhesion of a foreign substance or the like.

1 is a block diagram of a charging system according to a first embodiment of the present invention. Battery detection operation flow diagram of Embodiment 1 of the present invention Block diagram of a charging system according to a second embodiment of the present invention Block diagram of conventional charging system Conventional battery detection operation flow diagram

  A charging system according to the present invention includes a battery pack including a charging battery, a battery control circuit, a charging / discharging switch for controlling charging / discharging current on / off, a battery pack, a positive / negative terminal, and a communication terminal. Connected, receives power from the primary circuit of the AC / DC converter, controls the charging current and charging control voltage for charging the charging battery of the battery pack, or supplies the output to the connected battery pack In a charging system comprising a charging device configured to control the operation of an output switch for charging or to communicate with a battery pack, a resistance is provided between the negative electrode terminal and the communication terminal of the battery pack. A charging switch is provided between the communication terminal and the charging control circuit, and when the battery pack is connected, the resistance of the communication terminal is detected and The changeover switch is switched to the communication line side, the output switch is turned on, the battery control circuit of the battery pack is activated by the output voltage of the charging device, and the activation control signal transmitted from the battery pack is received by the charging control circuit of the charging device Then, after the charger recognizes the connection of the battery pack, the battery control circuit turns on the charge / discharge switch of the battery pack to start charging.

  In addition, after the charging device recognizes the connection of the battery pack, the charging / discharging switch of the battery pack is turned on, and the output voltage of the charging device is started to be lower than the charging control voltage.

  After the charging device detects the connection of the battery pack, the charging device outputs a low voltage, activates the battery control circuit, communicates with the charging device and the battery pack, recognizes that charging is possible, and then charges the battery. Output the necessary high voltage and start charging. In this charging system, the battery pack connection detection of the charging device can also serve as a communication terminal. In addition, since the charging device after detecting the battery pack does not output a high voltage until it can be charged, it is possible to prevent a high voltage from being output due to erroneous detection due to adhesion of a foreign substance or the like.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a block diagram of a charging system according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the charging system of the present invention includes a rechargeable battery 101, a battery control circuit 102 for performing communication and battery control between the battery pack and the charging device, a charge / discharge switch 103 for the battery pack, a battery pack 104, an AC / AC DC converter primary side circuit 105, output switch 106 for switching output on and off, and control of charging current and charging control voltage for charging the battery pack in the battery pack upon receiving power from the AC / DC converter primary side circuit A charge control circuit 107 having a function such as, a battery connection detection resistor 108, and a communication changeover switch 109 for switching from battery connection detection to communication between the charging device 111 and the battery pack 104. A battery detection operation flow chart at this time is shown in FIG.

  In the charging system according to the present invention, when the battery pack 104 is connected to the charging device 111, the charging device 111 is attached to the battery pack 104 by the battery connection detection resistor 108 provided between the communication terminal D and the negative terminal. To detect.

  Then, the output switch 106 is turned on by the charging control circuit 107, and at the same timing as the output switch 106 is turned on, the communication changeover switch 109 provided in the charging device 111 switches to a state where communication can be performed from the battery connection detection.

  When the output switch 106 is turned on, the output of the charging device 111 is supplied to the battery pack 104. The battery control circuit 102 provided in the battery pack 104 is activated by this supplied output, and communication is performed between the charging device 111 and the battery pack 104.

  When it is recognized that charging is possible, charging / discharging switch 103 is turned on to start charging.

(Embodiment 2)
As shown in FIG. 3, the basic configuration of the second embodiment is almost the same as that shown in FIG. 1 of the first embodiment, and a battery control circuit for performing communication and battery control between the rechargeable battery 301, the battery pack and the charging device. 302, battery pack charge / discharge switch 303, battery pack 304, AC / DC converter primary side circuit 305, output switch 306 for switching output on and off, and AC / DC converter primary side circuit receiving power supply Charging control circuit 307 having a function of controlling a charging current and a charging control voltage for charging a charging battery of the battery pack, a battery connection detecting resistor 308, communication switching for switching from battery connection detection to communication between the charging device and the battery pack A switch 309 and an output switching circuit 310 for switching the output range are included.

  In the charging system according to the present invention, when the battery pack 304 is connected to the charging device 311, the charging device 311 indicates that the battery pack 304 is attached by the battery connection detection resistor 308 provided between the communication terminal D and the negative terminal. To detect.

  Then, the output switch 306 is turned on by the charge control circuit 307. The output at this time is set by the charge control circuit 307 at a voltage lower than the charge control voltage. At the same timing when the output switch 306 is turned on, the communication changeover switch 309 provided in the charging device 311 switches to a state where communication can be performed from the battery connection detection. When the output switch 306 is turned on, the output of the charging device 311 is supplied to the battery pack 304. The battery control circuit 302 provided in the battery pack 304 is activated by the supplied output, and communication is performed between the charging device 311 and the battery pack 304. When it is recognized that charging is possible, the output switching circuit 310 of the charging device 311 switches to a high voltage necessary for charging, and the charging / discharging switch 303 is turned on to start charging.

  In the charging system of the present invention, after the charging device detects the connection of the battery pack, the charging device outputs a low voltage, activates the battery control circuit, communicates with the charging device and the battery pack, and is in a chargeable state. After recognizing, the high voltage required for charging is output and charging is started. In the present charging system, the battery pack connection detection of the charging device can also serve as a communication terminal, so there is no need to add a terminal or increase the cost.

  In addition, since the charging device after detecting the battery pack does not output a high voltage until it can be charged, a high-safety charging system can be easily constructed without high voltage being output due to erroneous detection due to adhesion of foreign matter, etc. can do.

DESCRIPTION OF SYMBOLS 101 Charge battery 102 Battery control circuit 103 Charge / discharge switch 104 Battery pack 105 AC / DC converter primary side circuit 106 Output switch 107 Charge control circuit 108 Battery connection detection resistor 109 Communication switch 111 Charging device 301 Charge battery 301 Battery control circuit 303 Charge / Discharge Switch 304 Battery Pack 305 AC / DC Converter Primary Side Circuit 306 Output Switch 307 Charge Control Circuit 308 Battery Connection Detection Resistor 309 Communication Switch 310 Output Switch Circuit 311 Charging Device

Claims (2)

A battery pack having a charging battery, a battery control circuit, a charging / discharging switch for controlling charging / discharging current on / off, and an AC / DC converter connected to the battery pack by a positive / negative terminal and a communication terminal An operation of an output switch for controlling a charging current and a charging control voltage for charging the charging battery of the battery pack by receiving power supply from the primary side circuit of the battery pack or supplying the output to the connected battery pack. In a charging system comprising a charging device comprising a charging control circuit capable of controlling or communicating with a battery pack, a resistor is provided between the negative electrode terminal and the communication terminal of the battery pack, and the charging device A communication switch is provided between the communication terminal and the charge control circuit. When the battery pack is connected, the resistance of the communication terminal is detected, and the communication switch is connected to the communication switch. The battery control circuit of the battery pack is activated by the output voltage of the charging device, and the charging control circuit of the charging device receives the activation signal transmitted from the battery pack. After the battery pack connection is recognized, the battery control circuit turns on a charge / discharge switch of the battery pack to start charging. After the charging device recognizes the connection of the battery pack, the charging / discharging switch of the battery pack is turned on, and the output voltage of the charging device until the charging is started is configured to be lower than the charging control voltage. And charging system.

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