JP2007143219A - Battery charging circuit and electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery charging circuit constituted of simple circuitry and capable of enhancing the lifetime and performance of a battery by charging secondary batteries connected in series uniformly. <P>SOLUTION: The battery charging circuit 12 comprises a first battery group 16 consisting of first and second batteries 16A and 16B connected in series, a second battery 18A, a capacitor 22 connected with the positive electrode of the second battery 18A, a first diode 24, second diodes 26A and 26B, third diodes 28A and 28B, and a power supply section 20 for charging the capacitor 22 which is switched to charge the first battery 16A when the capacitor 22 reaches a predetermined charging voltage and switched to charge the capacitor 22 when the first battery 16A reaches a predetermined charging voltage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a battery charging circuit and an electric device, and more particularly to a battery charging circuit for charging secondary batteries connected in series and an electric device using the battery charging circuit.

  Conventionally, in addition to a vehicle driving motor, a hybrid vehicle equipped with an engine-driven generator is known, and the hybrid vehicle is equipped with a battery charging circuit in which a plurality of secondary batteries are connected in series. ing. In the battery charging circuit, the driving motor is driven by the power output from the series-connected secondary batteries, and the power from the generator is charged to the series-connected secondary batteries.

  In recent years, with respect to such secondary batteries connected in series, improvement of the characteristics of the secondary battery and development of a new battery have been promoted so as to be adapted to new applications. In order for the developed secondary battery to exhibit its original performance, it is necessary to control the use environment condition, the charge condition, the discharge condition, and the like to be appropriate.

  In particular, the charging condition is how to restore the original capacity without damaging the discharged battery.

  For this reason, a charging method suitable for each type and use of the battery has been studied, including a detection method at the completion of charging and a countermeasure at the time of overcharging.

  Here, when discharging or charging by connecting batteries in series, if the capacity or internal resistance of all the batteries is always the same, discharging and charging can be performed in a well-balanced manner.

  In practice, however, the battery capacity or internal resistance slightly varies. Furthermore, even if the internal resistance is the same in the initial stage, the internal resistance of the battery changes with time due to trickle charging or float charging, and the capacity of the battery also changes. As a result, the balance of each battery is lost, the cell voltage varies, and the life of the battery is shortened or the performance is lowered.

  In order to maintain the balance of the batteries, each series-connected battery block connected in parallel is charged with one series-connected battery block and then charged with another series-connected battery block in order to perform charge control. Charging switch connected in series to the connected battery block, on / off control of the charging switch by the charging control means, and charging / discharging control of the backup battery configured to output the charging completion signal of each series battery block to the discharging control means An apparatus is known (Patent Document 1).

In addition, an assembled battery composed of a plurality of battery cells connected in series and connected in parallel for each battery cell, the cell voltage of the battery cell is measured, and a charging current is supplied to the battery cell in the bypass state. A voltage adjustment circuit that bypasses without flowing, a current sensor that measures the current flowing in the assembled battery, and the sum of the cell voltages of each battery cell becomes a predetermined voltage value, and the current measured by the current sensor is a predetermined current. 2. Description of the Related Art A battery charging device having a control unit that controls a voltage regulation circuit corresponding to a predetermined battery cell to be in a bypass state and to prevent a charging current from flowing through the battery cell when a value is detected is known. (Patent Document 2).
JP 2004-364446 A JP 2005-20866

  However, the inventions described in Patent Documents 1 and 2 have a problem that the number of parts of the device is large and the battery charging circuit is complicated.

  The present invention has been made to solve the above-described problems, and can recharge the secondary batteries configured in a simple circuit and connected in series without variation, thereby improving the battery life and performance. An object is to provide a battery charging circuit and an electric device.

  In order to achieve the above object, a battery charging circuit according to a first invention includes a first secondary battery group composed of two first secondary batteries connected in series, and the first secondary battery. A second secondary battery provided so as to correspond to the two first secondary batteries of the battery group, a capacitive element having one end connected to the positive electrode of the second secondary battery, and one end having the capacity The other end of the element is connected to the positive electrode side of the first secondary battery group, and the other end of the capacitor element is connected to the positive electrode side direction of the first secondary battery group. A first rectifying element that allows current flow and blocks current flow in a direction opposite to the positive electrode side; one end connected to a connection portion of the two first secondary batteries; and the other The end is connected to the negative electrode of the second secondary battery, and the current from the negative electrode of the second secondary battery toward the connecting portion A second rectifying element that allows the current to flow in a direction opposite to the direction of the connection, one end connected to the connection of the two first secondary batteries, and the other end Connected to the positive electrode of the second secondary battery, and allows a current flow from the connecting portion in the positive electrode direction of the second secondary battery, and allows a current flow in a direction opposite to the positive electrode direction. The third rectifying element to be blocked and one end connected to the positive electrode side of the first secondary battery group and the other end connected to the other end of the capacitive element so as to charge the capacitive element So that the first secondary battery provided on the positive electrode side of the first secondary battery group is charged when the capacitor element is charged to a predetermined charging voltage. The first secondary battery provided on the positive electrode side of the first secondary battery group is switched to supply electric power. When it is the predetermined charging voltage is conductive, and is configured to include a power supply means for supplying electric power is switched to charge the capacitive element.

  According to the battery charging circuit of the first invention, the power supply means supplies power so as to charge the capacitive element, and when the capacitive element is charged to a predetermined charging voltage, the first secondary It is switched so as to charge the first secondary battery provided on the positive electrode side of the battery group to supply electric power. At this time, the charged capacitive element is discharged, and the first secondary battery provided on the positive electrode side of the first secondary battery group is further charged.

  And when the 1st secondary battery provided in the positive electrode side of the 1st secondary battery group is charged and it becomes a predetermined charging voltage, it switches so that a capacitive element may be charged by a power supply means. Supply power. At this time, the 1st secondary battery provided in the positive electrode side of the 1st secondary battery group discharges, and the 2nd secondary battery is charged. When the second secondary battery is charged and the charging voltage is increased, the second secondary battery is discharged, and the first secondary battery provided on the negative electrode side of the first secondary battery group is charged. Is done.

  Then, as described above, by supplying power while switching to charge either the first secondary battery or the capacitive element provided on the positive electrode side of the first secondary battery group by the power source means Each of the capacitor element, the two first secondary batteries, and the second secondary battery repeats charging and discharging, and the respective charging voltages converge to reach a fully charged state.

  Accordingly, the first secondary battery is configured by a simple circuit including a plurality of secondary batteries, a capacitor element, a rectifying element, and power supply means, and provided on the positive electrode side of the first secondary battery group by the power supply means. Power is supplied while switching so as to charge either the secondary battery or the capacitive element, and each of the capacitive element, the two first secondary batteries, and the second secondary battery repeats charging and discharging in series. The connected secondary batteries are charged without variation, and the battery life and performance can be improved.

  According to a second aspect of the present invention, there is provided a battery charging circuit including a first secondary battery group composed of a plurality of first secondary batteries connected in series and two adjacent first secondary battery groups. A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to the first secondary battery are connected in series, and one end is on the positive electrode side of the second secondary battery group The connected capacitive element, one end connected to the one end of the capacitive element, and the other end connected to the positive electrode side of the first secondary battery group, and the first end of the capacitive element from the one end A first rectifying element that allows a current flow in the positive electrode side direction of one secondary battery group and blocks a current flow in a direction opposite to the positive electrode side direction; and one end of the first secondary battery group. Connected to the connection part of two adjacent first secondary batteries in the group, and the other end corresponds to the two adjacent first secondary batteries Is connected to the negative electrode of the second secondary battery, and allows a current flow from the negative electrode of the second secondary battery toward the connecting portion of the two adjacent first secondary batteries, A plurality of second rectifying elements that block current flow in the direction opposite to the connecting portion direction, and one end connected to a connecting portion of two adjacent first secondary batteries of the first secondary battery group And the other end is connected to the positive electrode of the second secondary battery corresponding to the two adjacent first secondary batteries, and the connection portion between the two adjacent first secondary batteries. A plurality of third rectifier elements that allow current flow in the positive electrode direction of the second secondary battery and block current flow in a direction opposite to the positive electrode direction, and one end of the second secondary battery is connected to the first second battery. The secondary battery group is connected to the positive electrode side and the other end is connected to the other end of the capacitive element, and the capacitive element is charged. When the capacitor element is charged and reaches a predetermined charging voltage, the first secondary battery provided on the positive electrode side of the first secondary battery group is charged. When the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches the predetermined charging voltage, the capacitive element is switched to And power supply means for switching to charge and supplying power.

  According to the battery charging circuit of the second invention, power is supplied by the power supply means so as to charge the capacitive element, and when the capacitive element is charged and reaches a predetermined charging voltage, the first secondary battery is charged. It is switched to charge the first secondary battery provided on the positive electrode side of the group to supply power. At this time, the charged capacitive element is discharged, and the first secondary battery provided on the positive electrode side of the first secondary battery group is further charged.

  And when the 1st secondary battery provided in the positive electrode side of the 1st secondary battery group is charged and it becomes a predetermined charging voltage, it switches so that a capacitive element may be charged by a power supply means. Supply power. At this time, the first secondary battery provided on the positive electrode side of the first secondary battery group is discharged, and two adjacent first secondary batteries provided on the positive electrode side of the first secondary battery group are discharged. The second secondary battery corresponding to the battery is charged. When the second secondary battery is charged and the charging voltage is increased, the second secondary battery is discharged, and the first secondary battery provided on the negative electrode side of the adjacent first secondary battery is discharged. The secondary battery is charged.

  Similarly, each of the plurality of first secondary batteries in the first secondary battery group and each of the plurality of second secondary batteries in the second secondary battery group are charged and discharged.

  Then, as described above, the power supply means supplies power while switching so as to charge either the first secondary battery or the capacitive element provided on the positive electrode side of the first secondary battery group, and the capacity Each of the element, the plurality of first secondary batteries connected in series, and the plurality of second secondary batteries connected in series repeats charging and discharging, and each charging voltage converges to reach a fully charged state. Become.

  Accordingly, the first secondary battery is configured by a simple circuit including a plurality of secondary batteries, a capacitor element, a rectifying element, and power supply means, and provided on the positive electrode side of the first secondary battery group by the power supply means. Power is supplied while switching to charge either the secondary battery or the capacitive element, and the capacitive element, the plurality of first secondary batteries connected in series, and the plurality of second secondary batteries connected in series By repeating charging and discharging, the secondary batteries connected in series are charged without variation, and the battery life and performance can be improved.

The power supply means according to the first and second aspects of the invention supplies power of a predetermined current toward the other end of the capacitive element so as to charge the capacitive element, and the capacitive element is charged to a predetermined charging voltage. The first secondary battery group is switched to the positive electrode side direction of the first secondary battery group so as to charge the first secondary battery provided on the positive electrode side of the first secondary battery group. When the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches a predetermined charging voltage, it is switched to the other end direction of the capacitive element and the predetermined current is Electric power can be supplied. Thereby, it is possible to supply constant current power while switching the current direction, and to charge the secondary batteries connected in series without variation. Further, the power supply means according to the first invention and the second invention, A first secondary battery provided on the positive electrode side of the first secondary battery group when electric power of a predetermined voltage is supplied so as to charge the capacitive element and the capacitive element is charged to a predetermined charging voltage. When a predetermined voltage is supplied so as to charge the battery, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged to a predetermined charging voltage, the capacitive element Can be switched to charge the power of a predetermined voltage. As a result, it is possible to supply constant voltage power while switching the charging destination, and charge the secondary batteries connected in series without variation.

  According to a third aspect of the present invention, there is provided a battery charging circuit including a first secondary battery group composed of a plurality of first secondary batteries connected in series, and two adjacent ones of the first secondary battery group. A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to the first secondary battery are connected in series, and one end is on the positive electrode side of the second secondary battery group The connected capacitive element, one end connected to the one end of the capacitive element, and the other end connected to the positive electrode side of the first secondary battery group, and the first end of the capacitive element from the one end A first rectifying element that allows a current flow in the positive electrode side direction of one secondary battery group and blocks a current flow in a direction opposite to the positive electrode side direction; and one end of the first secondary battery group. Connected to the connection part of two adjacent first secondary batteries in the group, and the other end corresponds to the two adjacent first secondary batteries Is connected to the negative electrode of the second secondary battery, and allows a current flow from the negative electrode of the second secondary battery toward the connecting portion of the two adjacent first secondary batteries, A plurality of second rectifying elements that block current flow in the direction opposite to the connecting portion direction, and one end connected to a connecting portion of two adjacent first secondary batteries of the first secondary battery group And the other end is connected to the positive electrode of the second secondary battery corresponding to the two adjacent first secondary batteries, and the connection portion between the two adjacent first secondary batteries. A plurality of third rectifier elements that allow current flow in the positive electrode direction of the second secondary battery and block current flow in a direction opposite to the positive electrode direction, and one end of the second secondary battery is connected to the first second battery. The secondary battery group is connected to the positive electrode side and the other end is connected to the other end of the capacitive element, and the capacitive element is charged. And when the capacitance element is charged and reaches a predetermined charging voltage, the supply of power is stopped and the first secondary battery group is provided on the positive electrode side. When the first secondary battery and the capacitive element are energized, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged to the predetermined charging voltage. And power supply means that is switched to charge the capacitive element and supplies power.

  According to the battery charging circuit of the third aspect of the invention, the power is supplied by the power supply means so as to charge the capacitive element, and the supply of power is stopped when the capacitive element is charged and reaches a predetermined charging voltage. At the same time, the first secondary battery provided on the positive electrode side of the first secondary battery group and the capacitive element are energized. Thereby, the charged capacitive element is discharged, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged.

  And when the 1st secondary battery provided in the positive electrode side of the 1st secondary battery group is charged and it becomes a predetermined charging voltage, it switches so that a capacitive element may be charged by a power supply means. Supply power. At this time, the first secondary battery provided on the positive electrode side of the first secondary battery group is discharged, and two adjacent first secondary batteries provided on the positive electrode side of the first secondary battery group are discharged. The second secondary battery corresponding to the battery is charged. When the second secondary battery is charged and the charging voltage is increased, the second secondary battery is discharged, and the first secondary battery provided on the negative electrode side of the adjacent first secondary battery is discharged. The secondary battery is charged.

  Similarly, each of the plurality of first secondary batteries in the first secondary battery group and each of the plurality of second secondary batteries in the second secondary battery group are charged and discharged.

  Then, as described above, the power supply is turned on and off so that either the first secondary battery or the capacitive element provided on the positive electrode side of the first secondary battery group is switched and charged. By doing so, each of the capacitor element, the plurality of first secondary batteries connected in series, and the plurality of second secondary batteries connected in series repeats charging and discharging, and the respective charging voltages converge. The battery is fully charged.

  Therefore, the first secondary battery and the capacity that are configured by a simple circuit including a plurality of secondary batteries, a capacitor element, a rectifier element, and power supply means, and are provided on the positive electrode side of the first secondary battery group. The power supply is turned on and off by the power supply means so as to switch and charge any of the elements, and the capacitive element, the plurality of first secondary batteries connected in series, and the plurality of second secondary batteries connected in series When each of the batteries repeats charging and discharging, the secondary batteries connected in series are charged without variation, and the battery life and performance can be improved.

  Moreover, said 1st secondary battery and 2nd secondary battery can be made into the substantially the same capacity | capacitance. Thereby, since the increase in the number of types of circuit components can be suppressed, the circuit configuration can be simplified.

  According to a fourth aspect of the present invention, there is provided a battery charging circuit including: a first secondary battery group in which a plurality of first secondary battery units including a plurality of first secondary batteries connected in series are connected in series; The first secondary battery group is provided so as to correspond to two adjacent first secondary battery units, and includes the same number of second secondary batteries as the first secondary battery units. A second secondary battery group in which a plurality of second secondary battery units are connected in series; a third secondary battery in which a negative electrode is connected to a positive electrode side of the second secondary battery group; The other end is connected to the negative electrode of the third secondary battery and the other end is connected to the positive electrode side of the first secondary battery group, and the first secondary is connected to the negative electrode of the third secondary battery. A first rectifying element that allows a current flow in the positive electrode side direction of the battery group and blocks a current flow in a direction opposite to the positive electrode side direction; and one end of the first secondary element Of the second secondary battery part connected to the connection part of two adjacent first secondary battery parts of the pond group and the other end corresponding to the two adjacent first secondary battery parts. And connected to the negative electrode side, and allows a current to flow from the negative electrode side of the second secondary battery part to the connection part direction of the two adjacent first secondary battery parts. A plurality of second rectifier elements that block current flow in opposite directions, one end of which is connected to a connection portion between two adjacent first secondary battery sections of the first secondary battery group, and The other end is connected to the positive electrode side of the second secondary battery part corresponding to the two adjacent first secondary battery parts, and the connection part between the two adjacent first secondary battery parts To permit the flow of current in the direction of the positive electrode side of the second secondary battery unit and prevent the flow of current in the direction opposite to the direction of the positive electrode side. A third rectifier element, one end of which is connected to the positive electrode side of the first secondary battery group, and the other end of which is connected to the positive electrode of the third secondary battery, and the third second rectifier element. When the third secondary battery is charged to a predetermined charging voltage by supplying power so as to charge the secondary battery, the first battery provided on the positive electrode side of the first secondary battery group 1 is switched to charge one secondary battery to supply electric power, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged to the predetermined charging voltage. Power supply means that is switched so as to charge the third secondary battery and supplies electric power.

  According to the battery charging circuit of the fourth invention, power is supplied by the power supply means so as to charge the third secondary battery, and the third secondary battery is charged to a predetermined charging voltage. Sometimes, switching is performed to charge the first secondary battery provided on the positive electrode side of the first secondary battery group to supply electric power. At the same time, the charged third secondary battery is discharged, and the plurality of first secondary batteries of the first secondary battery unit provided on the positive electrode side of the first secondary battery group are further charged. .

  Then, when the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches a predetermined charging voltage, the third secondary battery is charged by the power supply means. To supply power. At this time, the first secondary battery of the first secondary battery unit provided on the positive electrode side of the first secondary battery group is discharged and adjacent to the positive electrode side of the first secondary battery group. The plurality of second secondary batteries of the second secondary battery unit corresponding to the two first secondary battery units to be charged are charged. And when the secondary battery of this 2nd secondary battery part is charged and a charge voltage becomes high, the 2nd secondary battery of this 2nd secondary battery part will discharge, and said 1st adjacent 1st The first secondary battery of the first secondary battery part provided on the negative electrode side of the secondary battery part is charged.

  Similarly, each of the first secondary batteries of the plurality of first secondary battery parts of the first secondary battery group and the second of the plurality of second secondary battery parts of the second secondary battery group. Each of the secondary batteries is charged and discharged.

  Then, as described above, the power is switched while the power source is switched to charge either the first secondary battery or the third secondary battery provided on the positive electrode side of the first secondary battery group. By supplying the third secondary battery, the first secondary battery of each of the plurality of first secondary battery units connected in series, and the plurality of second secondary battery units connected in series Each second secondary battery repeats charging and discharging, and each charging voltage converges to reach a fully charged state.

  Accordingly, the first secondary battery is configured by a simple circuit including a plurality of secondary batteries, a rectifying element, and power supply means, and provided on the positive electrode side of the first secondary battery group by the power supply means, and Power is supplied while switching to charge any of the third secondary batteries, and each of the third secondary batteries and the first secondary batteries of each of the plurality of first secondary battery units connected in series , And the second secondary batteries of each of the plurality of second secondary battery units connected in series are repeatedly charged and discharged, so that the secondary batteries connected in series are charged without variation, and the battery life and performance are improved. Can be improved.

  In addition, the first to third secondary batteries according to the fourth invention can have substantially the same capacity. Thereby, since the increase in the number of types of circuit components can be suppressed, the circuit configuration can be simplified.

  Further, the first to third rectifying elements can be diodes. Thereby, the configuration of the circuit can be simplified.

  According to a fifth aspect of the present invention, there is provided a battery charging circuit comprising: a first secondary battery group composed of a plurality of first secondary batteries connected in series; and two adjacent ones of the first secondary battery group. A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to the first secondary battery are connected in series, and two adjacent second batteries of the first secondary battery group A third secondary battery group in which a plurality of third secondary batteries provided to correspond to one secondary battery are connected in series, and one end thereof is connected to the positive electrode side of the second secondary battery group. A first capacitor element, a second capacitor element having one end connected to the positive electrode side of the third secondary battery group, one end connected to the one end of the first capacitor element, and the other An end is connected to the positive electrode side of the first secondary battery group and from the one end of the first capacitor element toward the positive electrode side of the first secondary battery group. A first rectifying element that allows current flow and blocks current flow in a direction opposite to the positive electrode side; and two first secondary batteries whose one ends are adjacent to each other in the first secondary battery group. And the other end is connected to the negative electrode of the second secondary battery corresponding to the two adjacent first secondary batteries, and the negative electrode of the second secondary battery. A plurality of second rectifying elements that allow current flow in the direction of the connecting portion of the two adjacent first secondary batteries from one side and prevent current flow in the direction opposite to the direction of the connecting portion; Is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. The positive electrode of the second secondary battery is connected to the positive electrode of the secondary battery and from the connection portion of the two adjacent first secondary batteries. A plurality of third rectifier elements that allow a current flow in a direction and prevent a current flow in a direction opposite to the positive electrode direction; one end connected to the one end of the second capacitor element; and The other end is connected to the positive electrode side of the first secondary battery group and allows a current flow from the one end of the second capacitor element toward the positive electrode side of the first secondary battery group. A fourth rectifying element that blocks current flow in a direction opposite to the positive electrode side direction, and one end connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group. And the other end is connected to the negative electrode of the third secondary battery corresponding to the two adjacent first secondary batteries, and the two adjacent ones from the negative electrode of the third secondary battery. Allow the flow of current in the direction of the connection of the first secondary battery, and block the flow of current in the direction opposite to the direction of the connection A plurality of fifth rectifying elements, one end of which is connected to a connection portion of two first secondary batteries adjacent to each other in the first secondary battery group, and the other end of the two first first adjacent batteries. Connected to the positive electrode of the third secondary battery corresponding to the secondary battery of the second, and from the connecting portion of the two adjacent first secondary batteries to the positive electrode direction of the third secondary battery A plurality of sixth rectifying elements that allow current flow in a direction opposite to the positive electrode direction and one end of the first secondary battery group and the second capacitor element. The other end is connected to the other end of the first capacitive element, and power is supplied so as to charge the first capacitive element. The first secondary battery provided on the positive electrode side of the first secondary battery group and the first secondary battery group The capacitor is switched to charge the capacitor element to supply power, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged to the predetermined charging voltage. In some cases, it is configured to include power supply means that is switched to charge the first capacitor element and supplies electric power.

  According to the battery charging circuit of the fifth invention, when power is supplied by the power supply means so as to charge the first capacitive element, and when the first capacitive element is charged to a predetermined charging voltage, The first secondary battery group is switched to charge the first secondary battery and the second capacitor element provided on the positive electrode side of the first secondary battery group to supply electric power. At the same time, the charged first capacitor element is discharged, and the first secondary battery and the second capacitor element provided on the positive electrode side of the first secondary battery group are further charged.

  Then, when the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches a predetermined charging voltage, the first capacitive element is charged by the power supply means. Switched to supply power.

  At this time, the first secondary battery provided on the positive electrode side of the first secondary battery group is discharged, and the adjacent first secondary battery provided on the positive electrode side of the first secondary battery group is discharged. The corresponding second secondary battery is charged. Further, the second capacitor element is discharged, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged.

  When the second secondary battery is charged and the charging voltage is increased, the second secondary battery is discharged, and the first secondary battery provided on the negative electrode side of the adjacent first secondary battery. The battery is charged.

  Similarly, each of the plurality of first secondary batteries of the first secondary battery group and each of the plurality of second secondary batteries of the second secondary battery group are charged and discharged, and Each of the plurality of third secondary batteries of the third secondary battery group is charged and discharged in the same manner as each of the plurality of second secondary batteries of the second secondary battery group.

  Then, as described above, the power is supplied while switching so as to charge either the first secondary battery or the first capacitor element provided on the positive electrode side of the first secondary battery group. By doing so, the first capacitor element, the second capacitor element, the plurality of first secondary batteries connected in series, the plurality of second secondary batteries connected in series, and the plurality of second batteries connected in series Each of the secondary batteries 3 repeats charging / discharging, and each charging voltage converges to reach a fully charged state.

  Accordingly, the first secondary battery is configured by a simple circuit including a plurality of secondary batteries, a capacitor element, a rectifying element, and power supply means, and provided on the positive electrode side of the first secondary battery group by the power supply means. Power is supplied while switching so as to charge either the secondary battery or the first capacitive element, the first capacitive element, the second capacitive element, the plurality of first secondary batteries connected in series, and the serial connection Each of the plurality of second secondary batteries and the plurality of third secondary batteries connected in series repeats charging and discharging, so that the secondary batteries connected in series are charged without variation, and the battery life and Performance can be improved.

  Further, by providing two capacitive elements and two secondary battery groups symmetrically with respect to the first secondary battery group, the first secondary battery group can be switched to whichever power is supplied by the power supply means. Since the 1st secondary battery provided in the positive electrode side of the battery group can be charged, a secondary battery can be charged efficiently.

  The first to sixth rectifying elements according to the fifth invention can be diodes. Thereby, the configuration of the circuit can be simplified.

  In addition, the first to third secondary batteries according to the fifth invention can have substantially the same capacity. As a result, an increase in the number of types of circuit components can be prevented, and the circuit configuration can be simplified.

  An electric device according to a sixth aspect of the present invention is connected to the battery charging circuit and the first secondary battery group of the battery charging circuit, and is supplied with power from the first secondary battery group. And a load section to be configured.

  According to the electric device of the sixth invention, in the battery charging circuit, the first secondary batteries of the first secondary battery group are charged without variation, and power is loaded from the charged first secondary batteries. The load unit performs a predetermined operation.

  Therefore, the battery charging circuit is configured with a simple circuit, and the secondary batteries connected in series can be charged without variation, and the battery life and performance can be improved. Further, since the secondary battery is uniformly charged without variation, a constant capacity can be supplied even during discharging.

  As described above, according to the battery charging circuit of the present invention, it is configured with a simple circuit, and by charging and discharging a plurality of secondary batteries repeatedly, the series-connected secondary batteries are charged without variation. The battery life and performance can be improved.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the electric device 10 according to the first embodiment is charged with a battery charging circuit 12 that supplies DC power and a load unit 14 that is supplied with DC power from the battery charging circuit 12. The load part 14 has one end connected to the battery charging circuit 12 and the other end connected to the grounding part.

  The battery charging circuit 12 has a configuration in which a capacitor is replaced with a secondary battery in a Cockcroft-Walton circuit that has been conventionally developed for generating a high voltage of an accelerator. Specifically, the battery charging circuit 12 includes a first second battery 16A and 16B that are connected in series and have a plurality of first secondary batteries 16A and 16B having substantially the same capacity (for example, about 0.25 mAh). Second battery group composed of secondary battery group 16 and a plurality of second secondary batteries 18A, 18B connected in series and having substantially the same capacity as first secondary batteries 16A, 16B 18 and one end is connected to the positive electrode side of the first secondary battery group 16, and the direction of the positive electrode side of the first secondary battery group 16 and the direction opposite to this direction (the direction of the capacitor 22 described later) ) For supplying a predetermined current (for example, 0.1 mA) to one of them, one end is connected to the other end of the power source 20, and the other end is the second secondary battery group 18. And a capacitor 22 connected to the positive electrode side.

  The second secondary battery 18A of the second secondary battery group 18 is provided so as to correspond to the adjacent first secondary batteries 16A and 16B of the first secondary battery group 16. is there.

  Further, the battery charging circuit 12 further has an anode connected to the other end of the capacitor 22 and a cathode connected to one end of the power supply unit 20, and current flowing from the other end of the capacitor 22 toward one end of the power supply unit 20. An anode is connected to the negative electrode of the second secondary battery 18A provided on the positive electrode side of the second secondary battery group 18 and the first diode 24 that allows the flow and prevents the current flow in the opposite direction. In addition, the cathode is connected to the connection portion of the first secondary batteries 16A and 16B of the first secondary battery group 16, and the first secondary batteries 16A and 16B are connected from the negative electrode of the second secondary battery 18A. A second diode 26A that allows a current flow in the direction of the connecting portion of the second and prevents a current flow in the opposite direction, and a second secondary provided on the negative electrode side of the second secondary battery group 18. An anode is connected to the negative electrode of the battery 18B, and A second diode 26B having a cathode connected to the negative electrode of the first secondary battery 18B of the first secondary battery group 16, and a second secondary battery provided on the positive electrode side of the second secondary battery group 18. The cathode is connected to the positive electrode of the battery 18A, and the anode is connected to the connection part of the first secondary batteries 16A and 16B of the first secondary battery group 16, and the first secondary batteries 16A and 16B are connected. A third diode 28A that allows current flow in the positive direction of the second secondary battery 18A from the first portion and blocks current flow in the opposite direction, and is provided on the negative side of the second secondary battery group 18 A third diode in which the cathode is connected to the positive electrode of the secondary battery 18B, and the anode is connected to the negative electrode of the first secondary battery 18B provided on the negative electrode side of the first secondary battery group 18 28B is provided.

  Further, a switching unit 40 is provided on the negative electrode side of the first secondary battery group 16 to switch on / off the supply of DC power from the first secondary battery group 16 to the load unit 14. ing.

  The capacitor 22 is provided with a capacitor voltmeter 30 that measures the charging voltage of the capacitor 22, and the first secondary battery 16A has a secondary battery voltage that measures the charging voltage of the first secondary battery 16A. A total of 32 is provided.

  The power supply unit 20 changes from one of the DC power supplies 34A and 34B that output current based on a DC power supply 34A and 34B having different current directions of supplied power and a control signal from the switching control unit 42 described later to the other. The changeover switch 36 is configured to be switched.

  Further, a switching control unit 42 that controls a changeover switch 36 of the power supply unit 20 described later is provided based on the charging voltage of the capacitor voltmeter 30 and the charging voltage of the secondary battery voltmeter 32, and the switching control unit 42 is provided. The direction of the electric current output from the power supply unit 20 when the capacitor voltmeter 30 measures a predetermined charging voltage (for example, 4.3 V) is the direction of the positive side of the first secondary battery group 16. When the secondary battery voltmeter 32 measures a predetermined charging voltage (for example, 4.3 V), the direction of the electric current output from the power supply unit 20 is set to the first direction. The changeover switch 36 is controlled so as to switch in the direction opposite to the positive electrode side of the secondary battery group 16.

In the secondary batteries 16A, 16B, 18A, and 18B, one electrode is an aluminum foil (purity 99.99%, thickness 0.1 mm, for an electrolytic capacitor) cut into an electrode area of 1 cm ² as a slurry using a binder. ) And an active material (LiMn ₂ O ₄ ) and a conductive auxiliary material (acetylene black) are applied by dip coating. Metal Li is used for the counter electrode and 1M LiPF6 / EC + DEC is used for the electrolyte. Yes.

  The first diode 24, the second diodes 26A and 26B, and the third diodes 28A and 28B are made of Si diodes.

  Next, the operation of the first embodiment will be described.

  First, when power of a predetermined current is supplied from the power supply unit 20 in the direction of the capacitor 22, a circuit is formed in which the current flows from the power supply unit 20 through the capacitor 22 to the first diode 24 and returns to the power supply unit 20. The capacitor 22 is charged.

  When the capacitor 22 is charged and the capacitor voltmeter 30 measures a predetermined voltage, the changeover switch 36 switches the changeover switch 36 to reverse the direction of the electric current supplied from the power supply unit 20. Is formed between the power source unit 20 and the first secondary battery 16A, and flows to the third diode 28A. Accordingly, the first secondary battery is discharged by the capacitor 22 and the power source 20 supplies power. The battery 16A is charged.

  Further, when the first secondary battery 16A is charged and the secondary battery voltmeter 32 measures a predetermined voltage, the changeover switch 36 is switched by the changeover control unit 42 to change the direction of the electric current output from the power supply unit 20. Inverted, a current flows from the first secondary battery 16A, passes through the power supply unit 20, the capacitor 22, the second secondary battery 18A, and flows to the second diode 26A, so that the capacitor 22 is formed. And charging of the second secondary battery 18A due to the discharge of the first secondary battery 16A occurs. The charging of the second secondary battery 18A is performed regardless of the direction of the electric current output from the power supply unit 20. The charging voltage of the first secondary battery 16A is equal to the charging voltage of the second secondary battery 18A. Continue for higher.

  Similarly, the second secondary battery while the charging voltage of the second secondary battery 18A is higher than that of the first secondary battery 16B, regardless of the direction of the electric current output from the power supply unit 20. While the charging of the first secondary battery 16B occurs due to the discharge of 18A and the charging voltage of the first secondary battery 16B is higher than that of the second secondary battery 18B, the second due to the discharge of the first secondary battery 16B. The secondary battery 18B is charged.

  As described above, when the inversion of the direction of the current of the power output from the power supply unit 20 is repeated, as shown in FIG. 2, the charging voltage of the capacitor 22, the charging voltage of the first secondary battery 16A, and the second The amplitude of the charging voltage of the secondary battery 18A becomes smaller and converges to a fully charged state. For example, the charging voltage of each part after 900 seconds is the charging voltage 4.16V of the capacitor 22, the charging voltage 4.10V of the first secondary battery 16A, and the charging voltage 4.13V of the second secondary battery 18A. The voltage difference between the charging voltage of the first secondary battery 16A and the charging voltage of the second secondary battery 18A at the end of charging is 0.03V.

  When the switching unit 40 is turned on, the total voltage of the charging voltages is applied to the load unit 14 from the charged first secondary batteries 16A and 16B. Note that the first secondary batteries 16A and 16B and the second secondary batteries 18A and 18B may be charged by the power supply unit 20 even when a voltage is applied to the load unit 14.

  As described above, according to the electric device according to the first embodiment, the electric device is configured by a simple circuit including a plurality of secondary batteries, capacitors, diodes, and a power supply unit, and is supplied by the power supply unit. Supplying power while switching the current direction of power to either the direction of the first secondary battery provided on the positive electrode side of the first secondary battery group or the direction of the capacitor, a plurality of capacitors connected in series Each of the first secondary battery and the plurality of second secondary batteries connected in series repeats charging and discharging, thereby charging the secondary batteries connected in series without variation and improving battery life and performance. Can be made.

  Further, by uniformly charging a plurality of secondary batteries, a constant capacity can be supplied even when discharging to the load section.

  Further, since the battery itself can serve as a rectifier circuit, the circuit is simplified.

  In addition, since all of the plurality of secondary batteries provided in the battery charging circuit have substantially the same capacity, an increase in the number of types of circuit components can be suppressed, so that the circuit configuration can be simplified. .

  In addition, the use of a diode for rectifying the current flow can make the circuit configuration simpler.

  In the above embodiment, the case where the number of secondary batteries in the first secondary battery group and the number of secondary batteries in the second secondary battery group are the same is described as an example. Only the second secondary battery corresponding to the first secondary battery may be provided. In that case, the number of secondary batteries in the second secondary battery group may be one less than the number of secondary batteries in the first secondary battery group.

  Moreover, although the case where the number of the secondary battery groups of the first secondary battery group is two has been described as an example, according to the voltage of the power to be supplied to the load unit, the first secondary battery group The number of secondary batteries may be increased.

  Next, a second embodiment of the present invention will be described. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. The second embodiment is different from the first embodiment in that the power supply unit employs a pulse current method in which an output of a predetermined current in the direction toward the capacitor 22 is turned on and off.

  As shown in FIG. 3, in the electric device 110 according to the second embodiment, the power supply unit 120 of the battery charging circuit 112 includes a DC power supply 34A that outputs a predetermined current in the direction toward the capacitor 22, and a DC power supply 34A. The changeover switch 136 is configured to switch from one of the predetermined current output and energization to the other. The changeover switch 136 is configured so that the capacitor voltmeter 30 is set to a predetermined charging voltage based on a control signal from the switching control unit 42. When the secondary battery voltmeter 32 measures a predetermined charging voltage, the secondary battery voltmeter 32 switches to output a predetermined current from the power supply unit 120 toward the capacitor 22 side. .

  In addition, since the other structure of the electric apparatus 110 is the same as that of 1st Embodiment, the description regarding another structure is abbreviate | omitted.

  Next, the operation of the second embodiment will be described.

  First, when a predetermined current is output from the power supply unit 120 in the direction toward the capacitor 22, a circuit is formed in which the current flows from the power supply unit 120 through the capacitor 22 to the first diode 24 and returns to the power supply unit 20. Is charged.

  When the capacitor 22 is charged and the capacitor voltmeter 30 measures a predetermined voltage, the changeover switch 136 is switched by the changeover control unit 42, and the capacitor 22 and the first secondary battery 16 </ b> A are energized via the power supply unit 120. Since the charged capacitor 22 passes through the power supply unit 120 and the first secondary battery 16A and a circuit that flows to the third diode 28A is formed, the first secondary due to the discharge of the capacitor 22 is formed. The battery 16A is charged.

  When the first secondary battery 16A is charged and the secondary battery voltmeter 32 measures a predetermined voltage, the switch control unit 42 switches the changeover switch 136 so that the predetermined current from the power supply unit 120 is directed toward the capacitor 22 side. Since the output current flows from the first secondary battery 16A, passes through the power supply unit 120, the capacitor 22, and the second secondary battery 18A, and flows to the second diode 26A, the capacitor 22 is formed. And charging of the second secondary battery 18A due to the discharge of the first secondary battery 16A occurs. In the charging of the second secondary battery 18A, the charging voltage of the first secondary battery 16A is higher than the charging voltage of the second secondary battery 18A, regardless of whether the current output from the power supply unit 120 is on or off. Continue for a while.

  Similarly, while the charging voltage of the second secondary battery 18A is higher than that of the first secondary battery 16B, regardless of whether the current output from the power supply unit 120 is on or off, the second secondary battery 18A While the first secondary battery 16B is charged by the discharge and the charging voltage of the first secondary battery 16B is higher than that of the second secondary battery 18B, the second secondary battery 16B is discharged by the discharge of the first secondary battery 16B. The secondary battery 18B is charged.

  As described above, when the ON / OFF of the current output from the power supply unit 120 is repeated, the amplitude of the charging voltage of the capacitor 22, the charging voltage of the first secondary battery 16A, and the charging voltage of the second secondary battery 18A. Becomes smaller and converges to a fully charged state.

  As described above, according to the electric device according to the second embodiment, the electric device is configured by a simple circuit including a plurality of secondary batteries, capacitors, diodes, and a power supply unit, and the first A plurality of first secondary batteries connected in series, with the power supply turned on and off so as to switch and charge either the first secondary battery or the capacitor provided on the positive electrode side of the secondary battery group Each of the battery and the plurality of second secondary batteries connected in series repeats charging and discharging, so that the secondary batteries connected in series are charged without variation, and the battery life and performance can be improved.

  Next, a third embodiment will be described. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, a secondary battery is connected to one end of the power supply unit instead of a capacitor, and a diode is connected to each secondary battery unit composed of a plurality of secondary batteries. This is different from the first embodiment.

  As shown in FIG. 4, the battery charging circuit 214 according to the third embodiment includes a first secondary battery unit in which two first secondary batteries 216A and 216B having substantially the same capacity are connected in series. 216 and a first secondary battery unit 217 in which first secondary batteries 217A and 217B having substantially the same capacity as the first secondary batteries 216A and 216B are connected in series. Secondary battery group 250, second secondary battery unit 218 in which second secondary batteries 218A and 218B having a capacity substantially the same as that of first secondary batteries 216A and 216B are connected in series, and the capacity is first. A second secondary battery group 252 in which a second secondary battery part 219 in which second secondary batteries 219A and 219B, which are substantially the same as the secondary batteries 216A and 216B, are connected in series, is connected in series. Yes.

  Furthermore, one end of the battery charging circuit 214 is connected to the positive electrode side of the first secondary battery group 250, and the direction of the positive electrode side of the first secondary battery group 250 and the direction opposite to this direction (described later). A power supply unit 220 that supplies power of a predetermined voltage (for example, 4.3 V) to any one of the third secondary battery 222 side), a positive electrode is connected to the other end of the power supply unit 220, and a negative electrode Is connected to the positive electrode side of the second secondary battery group 18 and includes a third secondary battery 222 having a capacity substantially the same as that of the first secondary batteries 216A and 216B.

  Thereby, the capacity | capacitance of the 1st secondary battery part 216,217 and the 2nd secondary battery part 218,219 is twice the capacity | capacitance of the 3rd secondary battery 222. FIG.

  The second secondary battery unit 218 of the second secondary battery group 252 is provided so as to correspond to the adjacent first secondary battery units 216 and 217 of the first secondary battery group 250. Is.

  The battery charging circuit 214 further has an anode connected to the negative electrode of the third secondary battery 222 and a cathode connected to one end of the power supply unit 220, and the power supply unit starts from the negative electrode of the third secondary battery 222. A first diode 224 that allows current flow in one end direction of 220 and blocks current flow in the opposite direction; and a second secondary provided on the positive electrode side of the second secondary battery group 252. The anode is connected to the negative electrode side of the battery unit 218, the cathode is connected to the connection part of the first secondary battery part 216, 217 of the first secondary battery group 250, and the second secondary battery part 218 is connected. A second diode 226A that allows current flow in the direction from the negative electrode side toward the connection portion of the first secondary battery parts 216 and 217 and blocks current flow in the opposite direction, and a second secondary battery group The second secondary battery provided on the negative electrode side of 252 A second diode 226B having an anode connected to the negative electrode side of 219 and a cathode connected to the negative electrode side of the first secondary battery unit 217 of the first secondary battery group 250; The cathode is connected to the positive electrode side of the second secondary battery unit 218 provided on the positive electrode side of the battery group 252 and the connection part of the first secondary batteries 216 and 217 of the first secondary battery group 250 Is connected to the anode, and allows a current flow from the connection part of the first secondary battery part 216, 217 toward the positive side of the second secondary battery part 218, and prevents a current flow in the opposite direction. The cathode is connected to the positive electrode side of the secondary battery 219 provided on the negative electrode side of the third diode 228A and the second secondary battery group 252, and provided on the negative electrode side of the first secondary battery group 252. The anode is connected to the negative electrode of the first secondary battery unit 217 formed It is configured to include a third diode 228B which.

  In addition, a switching unit 40 is provided on the negative electrode side of the first secondary battery group 250 so as to switch on / off the supply of DC power from the first secondary battery group 250 to the load unit 14. ing.

  The power supply unit 220 is, for example, an AC power supply, and outputs an AC voltage having a predetermined voltage at a predetermined frequency.

  Next, the operation according to the third embodiment will be described.

  First, when power of a predetermined positive voltage is supplied from the power supply unit 220 in the direction toward the third secondary battery 222, current flows from the power supply unit 220 through the third secondary battery 222 to the first diode 224. A circuit returning to the power supply unit 220 is formed, and the third secondary battery 222 is charged.

  Then, the third secondary battery 222 is charged, and at a predetermined timing, the polarity of the voltage output from the power supply unit 220 is reversed, and the current is supplied from the third secondary battery 222 to the power supply unit 220, the first second battery. Since a circuit that passes through the secondary batteries 216A and 216B and flows to the third diode 228A is formed, the first secondary battery is discharged by the discharge of the third secondary battery 222 and the power supply from the power supply unit 220. Charging of 216A, 216B occurs. The predetermined timing is, for example, a timing at which the third secondary battery 222 reaches a predetermined charging voltage.

  Further, the first secondary batteries 216A and 216B are charged, and at a predetermined timing, the polarity of the voltage output from the power supply unit 220 is reversed, and the current flows from the first secondary batteries 216A and 216B. 220, the third secondary battery 222, the second secondary batteries 218A and 218B, and a circuit that flows to the second diode 226A is formed. Therefore, the charging of the third secondary battery 222, Charging of the second secondary batteries 218A and 218B occurs due to the discharge of the first secondary batteries 216A and 216B. The charging of the second secondary batteries 218A and 218B is performed regardless of whether the voltage of the power supplied from the power supply unit 220 is positive or negative, and the charging voltage of the first secondary batteries 216A and 216B is the second secondary battery. It continues while being higher than the charging voltage of 218A, 218B.

  Similarly, while the charging voltage of the second secondary batteries 218A and 218B is higher than that of the first secondary batteries 217A and 217B, regardless of whether the voltage of the power supplied from the power supply unit 220 is positive or negative, Charging of the first secondary batteries 217A and 217B due to the discharge of the secondary batteries 218A and 218B, and the charging voltage of the first secondary batteries 217A and 217B is higher than that of the second secondary batteries 219A and 219B, Charging of the second secondary batteries 219A and 219B occurs due to the discharge of the first secondary batteries 217A and 217B.

  As described above, when the inversion of the voltage of the power supplied by the power supply unit 220 is repeated, as shown in FIG. 5, the charging voltage of the third secondary battery 222, the first secondary batteries 216A, 216B. And the amplitudes of the charging voltages of the second secondary batteries 218A and 218B become smaller and converge to a fully charged state. For example, the charging voltage of each part at the end of charging is the charging voltage of 3.90 V for the third secondary battery 222, the charging voltage of 4.30 V for the first secondary battery 216A, and the charging voltage for the first secondary battery 216B. 4.18V, the charging voltage of the second secondary battery 218A is 3.90V, and the second secondary battery 218B is 4.00V.

As described above, the electric device according to the third embodiment is configured by a simple circuit including a plurality of secondary batteries, diodes, and a power supply unit. Power is supplied while switching to charge either the first secondary battery or the third secondary battery provided on the positive electrode side of the secondary battery group, and the third secondary battery is connected in series. The first secondary battery of each of the first secondary battery parts and the second secondary batteries of each of the plurality of second secondary batteries connected in series repeat charging and discharging, thereby being connected in series. The secondary battery can be charged without variation and the battery life and performance can be improved. In addition, there are two secondary batteries constituting each of the first secondary battery part and the second secondary battery part. Although a case has been described as an example, it is not limited to this. Also good.

  Moreover, although the case where the electric power of the constant voltage AC voltage is supplied has been described as an example, the electric power of the constant current may be supplied while switching the current direction.

  Next, a fourth embodiment will be described. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The fourth embodiment is different from the first embodiment in that the capacitor and the secondary battery group are further provided symmetrically with the capacitor and the second secondary battery group with respect to the first secondary battery group. Is different.

  As shown in FIG. 6, the battery charging circuit 314 according to the fourth embodiment includes a plurality of first secondary batteries 16A, 16B, 16C, and 16D that are connected in series and have substantially the same capacity. First secondary battery group 16 and second secondary batteries 18A, 18B and 18C connected in series and having substantially the same capacity as the first secondary batteries 16A to 16D. 2 secondary battery group 18, power supply unit 20, and first capacitor 320.

  Each of the second secondary batteries 18A to 18C includes an adjacent first secondary battery 16A, 16B, an adjacent first secondary battery 16B, 16C, and an adjacent first secondary battery 16C, 16D. Are provided corresponding to each of the above.

  Furthermore, the battery charging circuit 314 is connected in series and has a third secondary battery 318 </ b> A, 318 </ b> B, 318 </ b> C having a capacity substantially the same as that of the first secondary batteries 16 </ b> A to 16 </ b> D. The battery group 318 is configured to include a second capacitor 322 having one end connected to one end of the power supply unit 20 and the other end connected to the positive electrode side of the third secondary battery group 318. Each of the third secondary batteries 318A to 318C includes an adjacent first secondary battery 16A, 16B, an adjacent first secondary battery 16B, 16C, and an adjacent first secondary battery 16C, 16D. Are provided corresponding to each of the above.

  The battery charging circuit 314 includes a first diode 24, second diodes 26A to 26C, and third diodes 28A to 28D.

  Further, the battery charging circuit 314 has an anode connected to one end of the second capacitor 322 and a cathode connected to the positive electrode side of the first secondary battery group 16, and from one end of the second capacitor 322. A fourth diode 324 that allows a current flow in the positive electrode side direction of the first secondary battery group 16 and blocks a current flow in the opposite direction, and a cathode of the first secondary battery group 16 A negative electrode of a third secondary battery 318A connected to a connection portion between two adjacent first secondary batteries 16A and 16B and having an anode corresponding to the two adjacent first secondary batteries 16A and 16B. Is connected to the negative electrode of the third secondary battery 318A, and allows a current flow in the direction of the connecting portion of the two adjacent first secondary batteries 16A and 16B, and allows a current flow in the opposite direction. Blocking fifth diode 326 And the anode is connected to the connecting portion of the two adjacent first secondary batteries 16A, 16B of the first secondary battery group 16, and the cathode is the two adjacent first secondary batteries 16A. , 16B corresponding to the positive electrode of the third secondary battery 318A and the current in the positive direction of the third secondary battery 318A from the connection portion of the two adjacent first secondary batteries 16A, 16B. And a sixth diode 328A that prevents current flow in the opposite direction.

  Similarly, for the first secondary batteries 16B, 16C corresponding to the two adjacent first secondary batteries 16B, 16C and the first secondary batteries 16C, 16D, the fifth diodes 326B, 326C, Sixth diodes 328B and 328C are provided.

  Further, a switching unit 40 is provided on the negative electrode side of the first secondary battery group 16 to switch on / off the supply of DC power from the first secondary battery group 16 to the load unit 14. ing.

  In the power supply unit 20, the current direction of the power to be supplied is switched by the switching control unit 42 based on the charging voltage of the first capacitor 320 and the charging voltage of the first secondary battery 16 </ b> A. Is switched so as to switch the current direction of the power supplied from the power supply unit 20 to the positive side of the first secondary battery group 16 (the direction of the second capacitor 322) when becomes a predetermined charging voltage. The switch 36 is controlled so that the current direction of the power supplied from the power supply unit 20 is switched to the direction of the first capacitor 320 when the first secondary battery 16A reaches a predetermined charging voltage. Is to control.

  Next, the operation of the fourth embodiment will be described.

  First, when a current in the direction toward the first capacitor 320 is output from the power supply unit 20, a circuit flows from the power supply unit 20 through the first capacitor 320 to the first diode 24 and returns to the power supply unit 20. Once formed, the first capacitor 320 is charged.

  Then, when the first capacitor 320 is charged and the first capacitor 320 reaches a predetermined charging voltage, the switch control unit 42 switches the changeover switch 36 to reverse the current direction of the power supplied from the power supply unit 20, A circuit is formed in which a current passes from the power supply unit 20 through the second capacitor 322 and returns to the power supply unit 20 through the fourth diode 324, and the second capacitor 322 is discharged by the discharge of the capacitor 22 and the power supply of the power supply unit 20. Is charged. At the same time, a circuit is formed in which the current passes from the first capacitor 320 through the first secondary battery 16A and the third diode 28A and returns to the second capacitor 322. With the power supply of 20, charging of the first secondary battery 16A occurs.

  When the first secondary battery 16A is charged and the charging voltage is increased, the first diode starts from the first secondary battery 16A, passes through the first capacitor 320 and the second secondary battery 18A, and the second diode. Since the circuit that flows to 26A is formed, the second secondary battery 18A is charged by the discharge of the first secondary battery 16A. The charging of the second secondary battery 18A is continued while the charging voltage of the first secondary battery 16A is higher than the charging voltage of the second secondary battery 18A.

  Similarly, while the charging voltage of the second secondary battery 18A is higher than that of the first secondary battery 16B, the charging of the first secondary battery 16B due to the discharge of the second secondary battery 18A occurs, While the charging voltage of the first secondary battery 16B is higher than that of the second secondary battery 18B, the second secondary battery 18B is charged by the discharge of the first secondary battery 16B. The first secondary batteries 16C and 16D and the second secondary battery 18C are charged in the same manner as described above.

  When a current is output from the power supply unit 20 in the direction of the second capacitor 322, a circuit is formed that returns from the second capacitor 322 to the capacitor 322 through the first secondary battery 16A and the sixth diode 328A. Then, charging of the first secondary battery 16A occurs by discharging the second capacitor 322.

  When the first secondary battery 16A is charged and the charging voltage becomes high, the first diode starts from the first secondary battery 16A, passes through the second capacitor 322, the third secondary battery 318A, and the fifth diode. Since a circuit flowing to 326A is formed, charging of the third secondary battery 318A due to discharge of the first secondary battery 16A occurs. The charging of the third secondary battery 318A is continued while the charging voltage of the first secondary battery 16A is higher than the charging voltage of the third secondary battery 318A.

  Similarly, while the charging voltage of the third secondary battery 318A is higher than that of the first secondary battery 16B, the charging of the first secondary battery 16B due to the discharge of the third secondary battery 318A occurs, While the charging voltage of the first secondary battery 16B is higher than that of the third secondary battery 318B, the third secondary battery 318B is charged by the discharge of the first secondary battery 16B. The first secondary batteries 16C and 16D and the third secondary battery 318C are charged in the same manner as described above.

  As described above, when the reversal of the current direction of the power supplied by the power supply unit 20 is repeated, the charging voltage of the first capacitor 320, the second capacitor 322, and the first secondary batteries 16A to 16D, the second The amplitudes of the charging voltages of the secondary batteries 18A to 18C and the third secondary batteries 318A to 318C become smaller and converge to a fully charged state.

  As described above, according to the electric device according to the fourth embodiment, the electric device includes a simple circuit including a plurality of secondary batteries, capacitors, diodes, and a power supply unit. Power is supplied while switching the current direction of the power so as to charge either the first secondary battery or the first capacitor provided on the positive electrode side of the secondary battery group, the first capacitor, the second capacitor The capacitor, the plurality of first secondary batteries connected in series, the plurality of second secondary batteries connected in series, and the plurality of third secondary batteries connected in series are repeatedly charged and discharged. Thus, the secondary batteries connected in series can be charged without variation, and the battery life and performance can be improved.

  In addition, by providing two capacitors and secondary battery groups symmetrically with respect to the first secondary battery group, the first current can be supplied regardless of the direction of the current supplied by the power supply unit. Since the 1st secondary battery provided in the positive electrode side of the secondary battery group can be charged, a secondary battery can be charged efficiently.

  Note that the orientation of the electrodes and diodes of the secondary battery may be reversed. In this case, as shown in FIG. 7, the power source unit 20 is connected to the negative electrode side of the first secondary battery group 16 and the first The first capacitor 320 is connected to the negative electrode side of the second secondary battery group 18, and the second capacitor 322 is connected to the negative electrode side of the third secondary battery group 318. In addition, a first diode 24 is provided so as to allow current flow from the negative electrode side of the first secondary battery group 16 toward one end of the first capacitor 320 and to block current flow in the opposite direction. The flow of current in the positive direction of the second secondary battery 18A is allowed from the connecting portion of the two adjacent first secondary batteries 16A and 16B of the first secondary battery group 16 in the opposite direction. The second diode 26A is provided so as to block the current flow of the second secondary battery 18A, and two adjacent first secondary batteries 16A of the first secondary battery group 16 from the negative electrode of the second secondary battery 18A, A third diode 28A is provided to allow current flow in the direction of 16B connection and to block current flow in the opposite direction. Further, the other first diodes 26B and 26C and the second diodes 28B and 28C are provided in the same manner. Further, the fourth diode 324, the fifth diodes 326A to 326C, and the sixth diodes 328A to 328C interposed between the first secondary battery group 16 and the third secondary battery group 318 are provided symmetrically with the above. Just do it.

It is a circuit diagram which shows the structure of the electric apparatus which concerns on the 1st Embodiment of this invention. It is a graph which shows the change of the charging voltage of the capacitor which concerns on the 1st Embodiment of this invention, a 1st secondary battery, and a 2nd secondary battery. It is a circuit diagram which shows the structure of the electric apparatus which concerns on the 2nd Embodiment of this invention. It is a circuit diagram which shows the structure of the electric apparatus which concerns on the 3rd Embodiment of this invention. It is a graph which shows the change of the charge voltage of the 1st secondary battery which concerns on the 3rd Embodiment of this invention, and a 2nd secondary battery. It is a circuit diagram which shows the structure of the battery charging circuit which concerns on the 4th Embodiment of this invention. It is a circuit diagram which shows the structure of the battery charging circuit which concerns on another embodiment of the 4th Embodiment of this invention.

Explanation of symbols

10, 110 Electric device 12, 112, 214, 314 Battery charging circuit 14 Load section 16A, 16B, 16C First secondary battery 16 First secondary battery group 18A, 18B, 18C Second secondary battery 18 Second 2 Secondary battery group 20, 120 Power supply unit 22 Capacitor 24 First diode 26A, 26B Second diode 28A, 28B Third diode 30 Capacitor voltmeter 32 Secondary battery voltmeter 34A, 34B DC power supply 36, 136 Changeover switch 42 Switching control part 216, 217 First secondary battery part 216A, 216B, 217A, 217B First secondary battery 218, 219 Second secondary battery part 218A, 218B, 219A, 219B Second second Secondary battery 220 Power supply unit 222 Third secondary battery 224 First diode 226A, 226B Second diode 228 A, 228B Third diode 250 First secondary battery group 252 Second secondary battery group 318 Third secondary battery group 318A, 318B, 318C Third secondary battery 320 First capacitor 322 Second Capacitor 324 fourth diode 326A, 326B, 326C fifth diode 328A, 328B, 328C sixth diode

Claims (13)

A first secondary battery group composed of two first secondary batteries connected in series;
A second secondary battery provided to correspond to the two first secondary batteries of the first secondary battery group;
A capacitive element having one end connected to the positive electrode of the second secondary battery;
One end is connected to the one end of the capacitive element, the other end is connected to the positive side of the first secondary battery group, and the positive electrode of the first secondary battery group is connected from one end of the capacitive element. A first rectifying element that allows a current flow in a lateral direction and prevents a current flow in a direction opposite to the positive electrode side direction;
One end is connected to the connection part of the two first secondary batteries, and the other end is connected to the negative electrode of the second secondary battery, and the connection is made from the negative electrode of the second secondary battery. A second rectifying element that allows a current flow in the direction of the part and prevents a current flow in the direction opposite to the direction of the connection part
One end is connected to the connection part of the two first secondary batteries, and the other end is connected to the positive electrode of the second secondary battery, and from the connection part, the second secondary battery is connected to the positive electrode of the second secondary battery. A third rectifying element that allows a current flow in the positive electrode direction and prevents a current flow in a direction opposite to the positive electrode direction;
One end is connected to the positive electrode side of the first secondary battery group, the other end is connected to the other end of the capacitor element, and power is supplied so as to charge the capacitor element. Is switched to charge the first secondary battery provided on the positive electrode side of the first secondary battery group to supply electric power when the battery is charged and reaches a predetermined charging voltage, When the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches the predetermined charging voltage, it is switched to charge the capacitive element to supply electric power. Power supply means to
Including battery charging circuit. A first secondary battery group composed of a plurality of first secondary batteries connected in series;
A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to two adjacent first secondary batteries of the first secondary battery group are connected in series;
A capacitive element having one end connected to the positive electrode side of the second secondary battery group;
One end is connected to the one end of the capacitive element, and the other end is connected to the positive electrode side of the first secondary battery group, and from the one end of the capacitive element to the first secondary battery group. A first rectifying element that allows a current flow in the positive electrode direction and prevents a current flow in a direction opposite to the positive electrode direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the negative electrode of the secondary battery of the second secondary battery, and allows a current to flow from the negative electrode of the second secondary battery toward the connection part of the two adjacent first secondary batteries, and the direction of the connection part A plurality of second rectifying elements that block current flow in the opposite direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the positive electrode of the secondary battery, and allows a current to flow from the connecting portion of the two adjacent first secondary batteries toward the positive electrode of the second secondary battery, A plurality of third rectifying elements for blocking current flow in opposite directions;
One end is connected to the positive electrode side of the first secondary battery group, the other end is connected to the other end of the capacitor element, and power is supplied so as to charge the capacitor element. Is switched to charge the first secondary battery provided on the positive electrode side of the first secondary battery group to supply electric power when the battery is charged and reaches a predetermined charging voltage, When the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches the predetermined charging voltage, it is switched to charge the capacitive element to supply electric power. Power supply means to
Including battery charging circuit.   The power supply means supplies power of a predetermined current in the direction of the other end of the capacitive element so as to charge the capacitive element, and when the capacitive element is charged to a predetermined charging voltage, Switching to the positive electrode side direction so as to charge the first secondary battery provided on the positive electrode side of the secondary battery group to supply power of the predetermined current, The power of the predetermined current is supplied by switching to the other end direction of the capacitive element when the first secondary battery provided on the positive electrode side is charged and reaches the predetermined charging voltage. The battery charging circuit according to 1 or 2.   The power supply means supplies power of a predetermined voltage so as to charge the capacitor element, and when the capacitor element is charged and reaches a predetermined charge voltage, the power source means is connected to the positive electrode side of the first secondary battery group. The first secondary battery provided on the positive electrode side of the first secondary battery group is switched to charge the provided first secondary battery to supply electric power of the predetermined voltage. 3. The battery charging circuit according to claim 1, wherein when the battery is charged and reaches the predetermined charging voltage, the battery is switched so as to charge the capacitive element to supply the electric power of the predetermined voltage. A first secondary battery group composed of a plurality of first secondary batteries connected in series;
A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to two adjacent first secondary batteries of the first secondary battery group are connected in series;
A capacitive element having one end connected to the positive electrode side of the second secondary battery group;
One end is connected to the one end of the capacitive element, and the other end is connected to the positive electrode side of the first secondary battery group, and from the one end of the capacitive element to the first secondary battery group. A first rectifying element that allows a current flow in the positive electrode direction and prevents a current flow in a direction opposite to the positive electrode direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the negative electrode of the secondary battery of the second secondary battery, and allows a current to flow from the negative electrode of the second secondary battery toward the connection part of the two adjacent first secondary batteries, and the direction of the connection part A plurality of second rectifying elements that block current flow in the opposite direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the positive electrode of the secondary battery, and allows a current to flow from the connecting portion of the two adjacent first secondary batteries toward the positive electrode of the second secondary battery, A plurality of third rectifying elements for blocking current flow in opposite directions;
One end is connected to the positive electrode side of the first secondary battery group, the other end is connected to the other end of the capacitor element, and power is supplied so as to charge the capacitor element. When the battery is charged and reaches a predetermined charging voltage, the supply of the power is stopped, and the first secondary battery and the capacitive element provided on the positive electrode side of the first secondary battery group Is switched to charge the capacitive element when the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches the predetermined charging voltage. Power supply means to be supplied with power,
Including battery charging circuit.   The battery charging circuit according to claim 1, wherein the first secondary battery and the second secondary battery have substantially the same capacity. A first secondary battery group in which a plurality of first secondary battery units composed of a plurality of first secondary batteries connected in series are connected in series;
The first secondary battery group is provided so as to correspond to two adjacent first secondary battery units, and includes the same number of second secondary batteries as the first secondary battery units. A plurality of second secondary battery units connected in series;
A third secondary battery having a negative electrode connected to the positive electrode side of the second secondary battery group;
One end is connected to the negative electrode of the third secondary battery, the other end is connected to the positive electrode side of the first secondary battery group, and the first secondary battery is connected to the first secondary battery from the negative electrode of the third secondary battery. A first rectifying element that allows a current flow in the positive electrode side direction of the secondary battery group and prevents a current flow in a direction opposite to the positive electrode direction;
One end is connected to a connection portion between two first secondary battery portions adjacent to each other in the first secondary battery group, and the other end corresponds to the two adjacent first secondary battery portions. A current flow from the negative electrode side of the second secondary battery unit toward the connection part of the two adjacent first secondary battery units is connected to the negative electrode side of the second secondary battery unit. A plurality of second rectifying elements that permit and prevent current flow in a direction opposite to the connection direction;
One end is connected to a connection portion between two first secondary battery portions adjacent to each other in the first secondary battery group, and the other end corresponds to the two adjacent first secondary battery portions. A current flow is connected to the positive electrode side of the second secondary battery unit and from the connection part of the two adjacent first secondary battery units to the positive electrode side of the second secondary battery unit. A plurality of third rectifying elements that allow and prevent current flow in a direction opposite to the positive electrode side direction;
One end is connected to the positive electrode side of the first secondary battery group, and the other end is connected to the positive electrode of the third secondary battery, and power is charged so as to charge the third secondary battery. And charging the first secondary battery provided on the positive electrode side of the first secondary battery group when the third secondary battery is charged and reaches a predetermined charging voltage. When the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and reaches the predetermined charging voltage, the third secondary battery group is supplied with electric power. Power supply means that is switched to charge the secondary battery and supplies power;
Including battery charging circuit.   The battery charging circuit according to claim 7, wherein the first to third secondary batteries have substantially the same capacity.   The battery charging circuit according to any one of claims 1 to 8, wherein the first to third rectifying elements are diodes. A first secondary battery group composed of a plurality of first secondary batteries connected in series;
A second secondary battery group in which a plurality of second secondary batteries provided so as to correspond to two adjacent first secondary batteries of the first secondary battery group are connected in series;
A third secondary battery group in which a plurality of third secondary batteries provided to correspond to two adjacent first secondary batteries of the first secondary battery group are connected in series;
A first capacitive element having one end connected to the positive electrode side of the second secondary battery group;
A second capacitive element having one end connected to the positive electrode side of the third secondary battery group;
One end is connected to the one end of the first capacitor element, the other end is connected to the positive electrode side of the first secondary battery group, and the first capacitor element is connected to the first capacitor element from the one end of the first capacitor element. A first rectifying element that allows a current flow in the positive electrode side direction of the secondary battery group and prevents a current flow in a direction opposite to the positive electrode direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the negative electrode of the secondary battery of the second secondary battery, and allows a current to flow from the negative electrode of the second secondary battery toward the connection part of the two adjacent first secondary batteries, and the direction of the connection part A plurality of second rectifying elements that block current flow in the opposite direction;
One end of the second secondary battery is connected to a connection portion between two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the positive electrode of the secondary battery, and allows a current to flow from the connecting portion of the two adjacent first secondary batteries toward the positive electrode of the second secondary battery, A plurality of third rectifying elements for blocking current flow in opposite directions;
One end is connected to the one end of the second capacitor element, the other end is connected to the positive electrode side of the first secondary battery group, and the first capacitor element is connected to the first capacitor element from the one end of the second capacitor element. A fourth rectifying element that allows a current flow in the positive electrode side direction of the secondary battery group and prevents a current flow in a direction opposite to the positive electrode side direction;
One end of the third secondary battery is connected to a connection portion of two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the negative electrode of the second secondary battery, and allows a current to flow from the negative electrode of the third secondary battery toward the connection portion of the two adjacent first secondary batteries, and the direction of the connection portion. A plurality of fifth rectifying elements that block current flow in the opposite direction;
One end of the third secondary battery is connected to a connection portion of two adjacent first secondary batteries of the first secondary battery group, and the other end corresponds to the two adjacent first secondary batteries. Connected to the positive electrode of the secondary battery, and allows a current to flow from the connecting portion of the two adjacent first secondary batteries to the positive direction of the third secondary battery, A plurality of sixth rectifier elements for blocking current flow in opposite directions;
One end is connected to the positive electrode side of the first secondary battery group and the other end of the second capacitor element, and the other end is connected to the other end of the first capacitor element. When power is supplied so as to charge the capacitor element, and the capacitor element is charged to a predetermined charging voltage, the first second battery provided on the positive electrode side of the first secondary battery group. The secondary battery and the second capacitive element are switched to charge and supply electric power, and the first secondary battery provided on the positive electrode side of the first secondary battery group is charged and the predetermined battery is charged. Power supply means that is switched to charge the first capacitive element and supplies power when the charging voltage is
Including battery charging circuit.   The battery charging circuit according to claim 10, wherein the first to sixth rectifying elements are diodes.   The battery charging circuit according to claim 10 or 11, wherein the first to third secondary batteries have substantially the same capacity. The battery charging circuit according to any one of claims 1 to 12,
A load unit connected to the first secondary battery group of the battery charging circuit and supplied with power from the first secondary battery group;
Including electrical equipment.

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