JPH06121465A - Charger provided with discharge function - Google Patents

Abstract

PURPOSE:To secure a maximum of discharge capacity at all times by charging a battery after discharging it to the voltage after deep discharge, in case of charging it when it is above the voltage after stipulated deep discharge. CONSTITUTION:When the voltage of a battery BTT is higher than the voltage after stipulated deep discharge and it is not discharged completely, the discharge processing by a discharge circuit 104 is performed. At the point of time when the voltage of the battery BTT has dropped to the voltage after the stipulated deep discharge, the charge by a charging circuit 101 is performed. After start of charge, the charge sequence by specified method is executed, and a fixed quantity of electricity based on the rating of the battery BTT is applied, and the charge work is finished. Hereby, manifestation of the memory effect in the specified battery such as an Ni-Cd battery, etc., is prevented, and a maximum of charge capacity can be secured at all times by preventing the drop of charge capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a charger, and further Ni.
The present invention relates to a technology that is effective when applied to a charger for a specific battery such as a Cd (nickel / cadmonium) battery or a hydrogen battery, and is effective when used as a power supply unit of an electronic device such as a portable personal computer. It is about.

[0002]

2. Description of the Related Art For example, an electronic device such as a portable personal computer or a mobile phone has a built-in secondary battery such as a Ni-Cd battery and operates by using the built-in secondary battery as a power source.

In this type of electronic equipment, a charger is attached either internally or externally in order to charge the internal secondary battery.

Here, the conventional charger is constituted by combining a constant current circuit with a timer or a voltage detection circuit, and timer charging in which a constant current is supplied for a predetermined fixed time, or the charging voltage is slightly lowered from a peak. ΔV charging was carried out to energize (for example, CQ
Publisher "Transistor Technology July 1985" 441
~ 442).

[0005]

However, the present inventors have clarified that the above-mentioned technique has the following problems.

That is, in a specific battery such as a Ni-Cd battery or a hydrogen battery, there is a so-called memory effect, and when supplementary charging is repeated for a battery that has not been completely discharged, the supplementary charge amount becomes the capacity of the battery. It has the property of creating such habits.

When this memory effect is manifested, it goes without saying that the capacity of the battery is substantially reduced, and even if the battery is charged, the capacity is immediately exhausted.

An object of the present invention is to provide a technique for preventing a decrease in charge capacity due to a memory effect and always ensuring a maximum charge capacity.

The above and other objects and characteristics of the present invention will be apparent from the description of the present specification and the accompanying drawings.

[0010]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, when a charging circuit for charging the battery and a discharging circuit for discharging the battery are provided and charging is performed when the battery is at a voltage equal to or higher than a prescribed deep discharged voltage, The discharge circuit discharges the battery to the voltage after the deep discharge, and then the charge circuit charges the battery.

[0012]

According to the above-mentioned means, it is possible to prevent the memory effect from being exhibited in a specific battery such as a Ni-Cd battery.

Thus, the object of preventing the decrease of the charge capacity due to the memory effect and always ensuring the maximum charge capacity is achieved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the figures, the same reference numerals indicate the same or corresponding parts.

FIG. 1 shows an embodiment of a charger with a discharge function to which the technique of the present invention is applied.
Is a specific battery such as a Ni-Cd battery, 101 is a charging circuit,
102 and 103 are voltage detection circuits, 104 is a discharge circuit, 105 is a control logic circuit, 106 is a monitor display unit,
Reference numeral 107 denotes a button switch as an operation unit.

The charging circuit 101 is formed by combining a constant current circuit and a voltage detection circuit, and performs ΔV charging in which power is supplied to a point where the charging voltage slightly drops from a peak.

The voltage detection circuits 102 and 103 monitor the voltage of the specific battery BTT, and detect the voltage after deep discharge and the charge end voltage. Each detection result is output as a binary logic signal of 1 and 0 and transmitted to a control logic circuit 105 described later.

The discharge circuit 104 discharges the specific battery BTT with a current below a certain level.

The control logic circuit 105 includes a voltage detection circuit 10
The charging circuit 101 and the discharging circuit 104 are controlled based on the detection outputs of 2 and 103. Specifically, when the battery BTT is charged when the voltage is equal to or higher than a specified deep-discharged voltage, the discharge circuit 104 discharges the battery BTT to the deep-discharged voltage, and then the charging is performed. Control logic is built up to cause the circuit 101 to charge.

The monitor display unit 106 is composed of an LED (light emitting diode) or the like, and displays the operating states of the charging circuit 101 and the discharging circuit 104 via the control logic circuit 105.

The button switch 107 is the battery BTT described above.
It is used to provide a logic signal to the control logic to command the start of charging to.

Next, the operation will be described.

FIG. 2 is a flow chart showing an example of the operation of the main part of the charger with the discharge function shown in FIG. 1. When the start of charging is instructed by the operation of the button switch 107, etc. , It is determined whether or not the voltage of the battery BTT has dropped to the voltage after the specified deep discharge. That is, it is determined whether or not the battery BTT is completely discharged (S1).

If it is determined that the battery BTT is fully discharged (S1-YES), the charging circuit 101
Is charged. This charge is a specific battery BTT
(S3).

On the other hand, when it is determined that the voltage of battery BTT is higher than the voltage after the specified deep discharge and the battery is not completely discharged (S1-NO), discharge processing by discharge circuit 104 is performed. Then, if the battery voltage is lowered to the voltage after the deep discharge by the discharging process, the charging circuit 101 starts charging at this point (S1, S2, S3).

After the charging is started, a charging sequence according to a predetermined method is executed, a constant amount of electricity based on the rating of the battery BTT is supplied, and the charging operation is finished (S).
4).

Charging in this case is performed by, for example, the specific battery BT.
When T is a Ni-Cd battery, ΔV charging is performed by energizing the battery until the charging voltage slightly decreases from the peak.

As described above, the memory effect is prevented from being exhibited in the specific battery such as the Ni-Cd battery, whereby the decrease of the charge capacity due to the memory effect is prevented and the maximum charge capacity can be always secured. Like Here, the dependency of each voltage value of the specific rechargeable battery is specified as follows. Voltage at completion of charging> Discharge end voltage (determined by usage conditions of electronic device side (matrix device))> Voltage after deep (complete) discharge> Voltage after over-discharge

By always ensuring the maximum charging capacity, the specific rechargeable battery BTT can be downsized when maintaining the same electric capacity as compared with the conventional one.

Also, the required space and volume are small, and the weight is light, which is advantageous in handling when used in various equipment.

Especially when applied to an electric vehicle, if the same electric capacity is secured as compared with the conventional system, the specific rechargeable battery B
Since the weight of the TT can be reduced, the weight of the automobile is also reduced. Therefore, if the same wheel torque is maintained, the output of the drive wheel motor can be small, and the motor can be made compact.

Further, if the drive wheel motor having the same output is used, the weight of the automobile is reduced by the weight of the specific rechargeable battery BTT, so that the acceleration force can be improved and the mileage can be extended.

The following are detailed circuit level embodiments of the present invention.

FIG. 3 is a specific circuit diagram of a charger with a discharge function to which the technique of the present invention is applied, and FIG. 4 is a truth table showing its operation.

In FIG. 3, first, the power source L for VCC and the power source M for charging are energized.

Next, the specific rechargeable battery BTT that may or may exhibit the memory effect is correctly connected according to the circuit diagram shown in FIG. 3 so that the +-polarity is not mistaken at the points x and y. .

These states will be described below in order with reference to the circuit diagram shown in FIG.

When the Vcc power supply L is supplied to the Vcc line,
The circuits A to K, the logic elements IC1 to IC22, the light emitting diodes D1 to D5, the SCR, the relay coils RL1 and RL2, and the relay switches SWR1-1 and SWR1-2 and SWR2 are in the operable state.

When the charging power source M is supplied to the charging line, the charging becomes possible.

Circuits A to K and logic elements IC1 to IC2
According to the custom at the time of making a circuit drawing, the VCC supply connection line and the GND line are omitted in FIG. 2, but these are assumed to be connected.

In this state, the relay switch is in the initial state, and the COM of the terminal 2 of each of SWR1-1, SWR1-2 and SWR2 is separated from NO of the terminal 1 and is in contact with NC of the terminal 3.

SWR1-1 is COM of terminal 2 and NC of terminal 3
By contacting with the charging power source M, a loop is formed in which the voltage of the charging power source M is applied to the low voltage detecting circuit C / high voltage detecting circuit D and the specific rechargeable battery BTT.

If the internal resistance of the specific rechargeable battery BTT is sufficiently lower than the internal resistance of the charging power source M, the low voltage detection circuit C sets the voltage value of the specific rechargeable battery BTT. It is possible to detect a specified voltage value that is equal to or higher than the lower limit value that can be detected at the specified logic level.

Assuming that the specified voltage value is given the lower limit value itself that can be sensed at the logic level, the low voltage detection circuit C outputs a high level 1 signal when this is detected.
Is devised.

In the high voltage detection circuit D, if the specified voltage value gives a high voltage value when the specific rechargeable battery BTT reaches a certain charge amount, the specific rechargeable battery BTT that needs to be charged satisfies this. When the voltage value exceeds a possible state, it is devised to detect this and output a high level 1 signal.

Short / medium / long time timer circuit G / H / I
Indicates that the output is a low level 0 signal when the input terminal is in the initial state of the low level 0 signal, and when the high level 1 signal is applied to the input terminal, the output terminal outputs the high level 1 signal for a specified time. It has been devised to be.

The resistor R1 is for maintaining the low level 1 signal state when the relay switch SWR1-1 is OFF and COM of the terminal 2 and NO of the terminal 1 are in the released state, It is required that the value is sufficiently higher than the internal resistance of the specific rechargeable battery BTT.

The resistors R2 to R6 are light emitting diodes D1 to
This is for limiting the current of D5 and is for obtaining an appropriate amount of light emission.

Low voltage detection circuits A and C, high voltage detection circuit B
・ D is exactly the same, and the input circuit is a high input impedance circuit that uses MOS transistors to reduce discharge loss due to current leakage after charging.

The circuit shown in FIG. 3 is in the lower state of the truth table “state 1. discharging” in FIG.

Hereinafter, each operation will be described step by step as follows.

1. Circuit Operation 1.1 State 1. Explanation of circuit operation during discharging 1.1.1 State of relay switch SWR2 The specific rechargeable battery BTT for charging is a low voltage detection circuit if there is a potential difference that can be detected at a logic level without discharge partitioning. Input terminal 1 of C and high voltage detection circuit D
A high level 1 signal is applied to each of them, and the output terminal 2 of the low voltage detection circuit C becomes a low level 0 signal.

On the other hand, the output terminal 2 of the high voltage detection circuit D is
Since the specific rechargeable battery BTT has not reached a certain amount of charge, it has a low level 0 signal, which is a monostable FF circuit F.
Is applied to the input terminal 1. Therefore, the monostable FF circuit F does not operate, and its output terminal 2 becomes a low level 0 signal.

Negative logic element open collector NOT. O
Since the low level 0 signal from the output terminal 2 of the monostable FF circuit F is applied to the input terminal 1 of IC2 which is C, the output terminal 2 becomes a high level 1 signal. As a result, the output current does not flow, and therefore the current does not flow in the relay coil RL2 either, so the relay switch SWR2 is turned off.
Maintain the state of.

The relay switch S in the circuit diagram of FIG.
Terminal 1 of WR2 shows normally open NO, and 2 shows common COM. Further, 3 indicates a normal cross NC.

The state in which the relay switch SWR2 is OFF means that the terminals 1 and 2 are apart from each other and the terminals 2 and 3 are in contact with each other.

In the truth table of FIG. 4, 1 indicates a high level, and 0 indicates a low level signal state of each circuit and element.

Further, in the relay switch SWR2, 1
Indicates ON and 0 indicates OFF.

The above results can be expressed simply. The signals in the truth table “state 1. discharging” in FIG. 4 are in the initial state and are equivalent to “state 3. additional charging”. It becomes like 6.

1.1.2 Light-Emitting Diode D2 for Displaying Charging / Additional Charging and Relay Switches SWR1-1, SWR1-2
In the state of “1.1.1”, the resettable push button switch SW shown in the circuit diagram of FIG. 3 is pushed once. It should be noted that even if the button is pressed twice or more or chattering occurs, there is no problem and the effect is the same.

While the reset type push button switch SW is being pressed for a short time, the power supply voltage for VCC is connected to the terminal 1 of the relay coil RL1 and the input terminal 2 of the IC7.
The input terminal 2 of is a high level 1 signal.

The input terminals 1 of IC3, IC4 and IC5 are
It is connected to the output terminal 2 of the low voltage detection circuit C, and a high level 1 signal is applied to each signal for the above reason.

The input terminals 2 of IC3, IC4 and IC5 are
It is connected to the output terminal 2 of the high voltage detection circuit D, and a low level 0 signal is applied to each signal for the above reason.

The output terminal 3 of the IC3, which is the NOR element NOR, is connected to the input terminal 1 of the IC9, and the low level 0 signal is applied thereto.

The output terminal 3 of the IC4, which is the AND element AND, is connected to the input terminal 1 of the IC6, and a low level 0 signal is applied.

The output terminal 2 of the IC 6, which is the NOT logic element NOT, is connected to the input terminal 1 of the IC, and a high level 1 signal is applied thereto.

IC5 which is an exclusive OR element EX-OR
The output terminal 3 of is connected to the input terminal 1 of the IC 7 and receives a high level 1 signal.

IC7 which is an exclusive OR element EX-OR
The output terminal 3 of is connected to the input terminal 2 of the IC 8 and is applied with a low level 0 signal.

The output terminal 3 of the IC8, which is the AND element AND, is connected to the input terminal 2 of the IC9, and the low level 0 signal is applied.

The output terminal 3 of the IC9, which is the NOR element NOR, is connected to the input terminal 1 of the IC19, and the high level 1 signal is applied thereto.

Buffer element open collector BF. The output terminal 2 of the IC 19, which is an OC, is connected to the cathode side of the display light emitting diode D2 during charging / additional charging, and a high level 1 signal is applied thereto. On the other hand, the anode side of the diode D2 is always connected to the Vcc line, but since it is in the high level 1 signal state, no current flows and the light emitting diode D2 is turned off.

The output terminal 3 of the IC9, which is the NOR element NOR, is connected to the input terminal 1 of the IC10, and a high level 1 signal is applied.

Negative logic element open collector NOT.
The output terminal 2 of the IC 10 which is the OC is the relay coil RL.
It is connected to the terminal 2 of 1 and a low level 0 signal is applied. On the other hand, the terminal 1 of the relay coil RL1 is connected to the power supply voltage for VCC while the reset type push button switch SW described above is pressed, and a current flows because it is in the low level 0 signal state, and the relay switch SWR1 -1, SWR1-
2 is turned on, and the relay 1 composed of RL1, SWR1-1 and SWR1-2 is held by itself.

The relay switches SWR1-1 and SWR1-
The ON state of 2 means that the terminals 1 and 2 are in contact with each other and the terminals 2 and 3 are apart from each other.

Further, the relay switches SWR1-1 and SWR1-
In 2, the operating state is 1 for ON and 0 for OFF.

Further, in the light-emitting diode D2 for display during charging / additional charging, 1 indicates the lit state and 0 indicates the unlit state.

The above results can be simply expressed as the order of explanation 7 to 22 in the lower part of the truth table “state 1. discharging” in FIG.

1.1.3 Status of Discharging Display Light Emitting Diode D1 and SCR In the status of "1.1.2", the relay switch SWR1-1,
When SWR1-2 is turned ON and relay 1 is self-held, terminals 1 and 2 of SWR1-1 come into contact with each other,
The positive side discharge / charge line of the specific rechargeable battery BTT is connected to the input terminals 1 of the low voltage detection circuit A and the high voltage detection circuit B, and a high level 1 signal is applied to each.

The output terminal 2 of the low voltage detection circuit A is IC1
Is connected to the input terminal 1 and the high level 1 signal is applied.

The output terminal 2 of the high voltage detection circuit B is connected to IC1
However, since the specific rechargeable battery BTT has not reached a certain charge amount, a low level 0 signal is applied.

IC1 which is an exclusive OR element EX-OR
The output terminal 3 of is connected to the input terminal 1 of the IC 18, and a high level 1 signal is applied.

Negative logic element open collector NOT.
The output terminal 2 of the IC 18, which is an OC, is connected to the cathode side of the light emitting diode D1 for display during discharge, and a low level 0 signal is applied thereto. On the other hand, the anode side of the diode D1 is always connected to the Vcc line, but since it is in the low level 0 signal state, current flows and the light emitting diode D1
Lights up.

Further, the output terminal 3 of the IC1 which is the exclusive OR element EX-OR is connected to the input terminal 1 of the circuit E and a high level 1 signal is applied.

The output terminal 2 of the SCR drive circuit E is applied with the high level 1 signal to the input terminal 1,
A trigger pulse signal is output and applied to the gate G of the SCR. On the other hand, the anode side of the SCR is a specific rechargeable battery BT
It is connected to the positive side discharge / charge line of T, and the cathode side is grounded to GND, which is zero potential.

Therefore, the residual current of the specific rechargeable battery BTT flows and is intermittently discharged.

In the charging / additional charging display light emitting diode D1, 1 indicates an operating state in which the light is on and 0 is off.

In the SCR, 2 is in the intermittent discharge,
0 indicates an OFF operation state.

Furthermore, the detection point voltage values of the low voltage detection circuit A and the high voltage detection circuit B are set to the same value in the low voltage detection circuit C and the high voltage detection circuit D, respectively.

The above results can be simply expressed as the explanation ranks 23 to 29 in the lower part of the truth table “state 1. discharging” in FIG.

1.1.4 State of Light-Emitting Diode D4 for Recharge Required Display In the state of "1.1.3", the output terminal 2 of the low voltage detection circuit C is connected to the input terminal 1 of the IC11. , A high level 1 signal is applied.

The output terminal 2 of the high voltage detection circuit D is connected to the IC13
And a low level 0 signal is applied.

IC1 which is an exclusive OR element EX-OR
The output terminal 3 of is connected to the input terminal 1 of the IC 16 and receives a high level 1 signal.

The output terminal 3 of the IC9, which is the NOR element NOR, is connected to the input terminal 4 of the IC13, and the high level 1 signal is applied thereto.

The output terminal 2 of the IC11, which is the NOT logic element NOT, has short-term, medium-time, and long-time timer circuits G and H, respectively.
-It is connected to the input terminal 1 of I and a low level 0 signal is applied.

The output terminal 2 of the short time timer circuit G is I
It is connected to the input terminal 1 of C12 and a low level 0 signal is applied.

The output terminal 2 of the high voltage detection circuit D is connected to the IC12
Is connected to the input terminal 2 of and the low level 0 signal is applied.

The output terminal 3 of the IC12, which is the AND element AND, is connected to the input terminal 1 of the latch 1 circuit J, and a low level 0 signal is applied.

The output terminal 2 of the latch 1 circuit J is connected to the input terminal 1 of the IC 21 and receives the low level 0 signal.

Negative logic element open collector NOT.
The output terminal 2 of the IC 21, which is the OC, is connected to the cathode side of the recharge-necessary display light-emitting diode D4, and a high level 1 signal is applied thereto. On the other hand, the anode side of the diode D4 is always connected to the Vcc line, but since it is in the high level 1 signal state, no current flows and the light emitting diode D4
4 is turned off.

It should be noted that the rechargeable display light emitting diode D4
In the figure, 1 indicates an operating state in which the light is turned on and 0 is turned off.

The above results can be simply expressed as the order of explanation 30 to 41 in the lower part of the truth table “state 1. discharging” in FIG.

1.1.5 State of Charge Completion Display Light Emitting Diode D3 In the state of “1.1.4”, the output terminal 2 of the latch 1 circuit J
Is low level 0 connected to input terminal 1 of IC15
A signal is applied.

The output terminal 2 of the IC15, which is a NOT logic element NOT, is connected to the input terminal 2 of the IC13, and a high level 1 signal is applied.

The output terminal 2 of the medium time timer circuit H is I
It is connected to the input terminal 1 of C13 and a low level 0 signal is applied.

The output terminal 5 of the IC13, which is the AND element AND, is connected to the input terminal 1 of the latch 2 circuit K, and a low level 0 signal is applied.

The output terminal 2 of the latch 2 circuit K is connected to the IC 20.
Is connected to the input terminal 1 of and the low level 0 signal is applied.

Negative logic element open collector NOT.
The output terminal 2 of the IC 20, which is an OC, is connected to the cathode side of the charge completion display light emitting diode D3 and receives a high level 1 signal. On the other hand, the anode side of the diode D3 is always connected to the VCC line, but since it is in the high level 1 signal state, no current flows and the light emitting diode D3 is turned off.

The light-emitting diode D3 for indicating the completion of charging
In the figure, 1 indicates an operating state in which the light is turned on and 0 is turned off.

The above results can be simply expressed as the order of explanation 42 to 47 in the lower part of the truth table “state 1. discharging” in FIG.

1.1.6 State of Light Emitting Diode D5 for Displaying Life Warning In the state of "1.1.5", the output terminal 2 of the long-time timer circuit I is connected to the input terminal 1 of the IC14 and is low. The level 0 signal is applied.

The output terminal 2 of the IC14, which is the NOT logic element NOT, is connected to the input terminal 1 of the IC17, and a high level 1 signal is applied.

The output terminal 2 of the IC16, which is the NOT logic element NOT, is connected to the input terminal 2 of the IC17, and the low level 0 signal is applied thereto.

The output terminal 3 of the IC17, which is the AND element AND, is connected to the input terminal 1 of the IC22, and a low level 0 signal is applied.

Negative logic element open collector NOT.
The output terminal 2 of the IC 22 which is an OC is connected to the cathode side of the life warning display light emitting diode D5 and receives a high level 1 signal. On the other hand, the anode side of the diode D5 is always connected to the VCC line, but since it is in the high level 1 signal state, no current flows, and the light emitting diode D5
5 is turned off.

It should be noted that the life warning display light-emitting diode D5
In the figure, 1 indicates an operating state in which the light is turned on and 0 is turned off.

The above results can be simply expressed as the order of explanation 48 to 52 in the lower part of the truth table "state 1. discharging" in FIG.

From the following, the signal transmission path of the circuit is the same as that described in "1.1", so the description will be omitted and only the result will be described.

1.2 State 2. Explanation of circuit operation during charging 1.2.1 State of relay switch SWR2 Relay switch SWR2 maintains the OFF state.

The operation results of the circuit can be briefly expressed as the order of explanation 1 to 6 in the truth table "state 2. charging" of FIG.

1.2.2 Charging / Additional Charging Display Light Emitting Diode D2 and Relay Switches SWR1-1, SWR1-2
The light emitting diode D2 is turned on, and the relay switches SWR1-1 and SWR1-2 are turned off.

The operation result of the circuit can be simply expressed as the order of explanation 7 to 22 in the truth table "state 2. charging" of FIG.

1.2.3 Status of Light-Emitting Diode D1 for Display During Discharging and SCR The light-emitting diode D1 is in the off state and the SCR is in the OFF state.

The operation results of the circuit can be simply expressed as the order of explanation 23 to 29 in the truth table "state 2. charging" of FIG.

1.2.4 State of Light-Emitting Diode D4 for Recharging Required Display Light-emitting diode D4 is turned off.

The operation result of the circuit can be briefly expressed as the order of explanation 30 to 41 in the truth table "state 2. charging" of FIG.

1.2.5 State of Light-Emitting Diode D3 for Displaying Charging Completion The light-emitting diode D3 is turned off.

The operation result of the circuit can be briefly expressed as the explanation ranks 42 to 47 in the truth table "state 2. charging" of FIG.

1.2.6 State of the Life Warning Display Light Emitting Diode D5 The light emitting diode D5 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 48 to 52 in the truth table "state 2. charging" of FIG.

1.3 State 3. Explanation of circuit operation during additional charging 1.3.1 State of relay switch SWR2 Relay switch SWR2 maintains the OFF state.

The operation results of the circuit can be simply expressed as the order of explanation 1 to 6 in the truth table "state 3. additional charging" of FIG.

1.3.2 Charging / Additional Charging Display Light Emitting Diode D2 and Relay Switches SWR1-1, SWR1-2
The light emitting diode D2 is turned on, and the relay switches SWR1-1 and SWR1-2 are turned off.

The operation result of the circuit can be simply expressed as the order of explanation 7 to 22 in the truth table "state 3. additional charging" of FIG.

1.3.3 Status of Light-Emitting Diode D1 for Display and SCR During Discharging The light-emitting diode D1 is in the off state and the SCR is in the OFF state.

The operation results of the circuit can be simply expressed as the explanation ranks 23 to 29 in the truth table "state 3. additional charging" of FIG.

1.3.4 State of Light-Emitting Diode D4 for Recharging Required Display Light-emitting diode D4 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 30 to 41 in the truth table "state 3. additional charging" of FIG.

1.3.5 State of Light-Emitting Diode D3 for Displaying Charging Completion The light-emitting diode D3 is turned off.

The operation results of the circuit can be briefly expressed as the order of explanation 42 to 47 in the truth table "state 3. additional charging" of FIG.

1.3.6 State of Life Warning Display Light Emitting Diode D5 The light emitting diode D5 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 48 to 52 in the truth table "state 3. additional charging" of FIG.

1.4 State 4. Description of circuit operation for completion of charging 1.4.1 State of relay switch SWR2 Relay switch SWR2 repeats ON-OFF only once.

This is because when the high level 1 signal is input to the input terminal of the monostable FF circuit F, the output terminal is designed to change from the high level 1 signal to the low level 0 signal.

The operation result of the circuit can be simply expressed as the order of explanation 1 to 6 in the truth table "state 4. charging completed" of FIG.

1.4.2 Charging / Additional Charging Display Light Emitting Diode D2 and Relay Switches SWR1-1, SWR1-2
The light emitting diode D2 is turned off, and the relay switches SWR1-1 and SWR1-2 are turned on.

As a result, the COM of the terminal 2 of the relay switch SWR1-1 and the NC of the terminal 3 are automatically separated from each other, and the charging power source M and the specific rechargeable battery BTT are separated from each other to prevent overcharging.

The operation result of the circuit can be simply expressed as the order of explanation 7 to 22 in the truth table “state 4. charging completed” in FIG.

1.4.3 State of Discharging Display Light Emitting Diode D1 and SCR The light emitting diode D1 is off and the SCR is off.

The operation result of the circuit can be briefly expressed as the order of explanation 23 to 29 in the truth table "state 4. charging completed" of FIG.

1.4.4 State of Light-Emitting Diode D4 for Recharging Required Display Light-emitting diode D4 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 30 to 41 in the truth table "state 4. charge completed" of FIG.

1.4.5 State of Charge Completion Display Light Emitting Diode D3 The light emitting diode D3 is turned on.

The operation results of the circuit can be simply expressed as the order of explanation 42 to 47 in the truth table “state 4. charging completed” in FIG.

1.4.6 State of Light Emitting Diode D5 for Life Warning Display The light emitting diode D5 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 48 to 52 in the truth table "state 4. charging completed" of FIG.

1.5 State 5. Explanation of circuit operation for recharging 1.5.1 State of relay switch SWR2 Relay switch SWR2 repeats ON-OFF.

This is for the same reason as "1.4.1."

The operation results of the circuit can be simply expressed as the order of explanation 1 to 6 in the truth table "state 5. Recharge required" of FIG.

1.5.2 Charging / Additional Charging Display Light Emitting Diode D2 and Relay Switches SWR1-1, SWR1-2
The light emitting diode D2 is turned off, and the relay switches SWR1-1 and SWR1-2 are turned on.

The operation result of the circuit can be briefly expressed as the order of explanation 7 to 22 in the truth table "state 5. Recharge required" of FIG.

1.5.3 State of Light-Emitting Diode D1 for Display and SCR During Discharging The light-emitting diode D1 is off and the SCR is off.

The operation result of the circuit can be briefly expressed as the order of explanation 23 to 29 in the truth table "state 5. Recharge required" of FIG.

1.5.4 State of Light-Emitting Diode D4 for Recharging Required Display Light-emitting diode D4 is turned on.

The operation result of the circuit can be briefly expressed as the order of explanation 30 to 41 in the truth table "state 5. Recharge required" of FIG.

1.5.5 State of Charge Completion Display Light Emitting Diode D3 The light emitting diode D3 is turned off.

The operation results of the circuit can be simply expressed as the order of explanation 42 to 47 in the truth table "state 5. recharge required" of FIG.

1.5.6 State of Life Warning Display Light Emitting Diode D5 Light emitting diode D5 is turned off.

The operation result of the circuit can be briefly expressed as the order of explanation 48 to 52 in the truth table "state 5. Recharge required" of FIG.

1.6 State 6. Explanation of circuit operation for life warning 1.6.1 State of relay switch SWR2 Relay switch SWR2 is kept in OFF state.

The operation result of the circuit can be simply expressed as the order of explanation 1 to 6 in the truth table "state 6. life warning" of FIG.

1.6.2 Light-Emitting Diode D2 for Displaying Charging / Additional Charging and Relay Switches SWR1-1, SWR1-2
The light emitting diode D2 is turned on, and the relay switches SWR1-1 and SWR1-2 are turned off.

The operation result of the circuit can be briefly expressed as the order of explanation 7 to 22 in the truth table "state 6. life warning" of FIG.

1.6.3 State of Light-Emitting Diode D1 for Display and SCR During Discharging The light-emitting diode D1 is in the off state and the SCR is in the OFF state.

The operation results of the circuit can be simply expressed as the order of explanation 23 to 29 in the truth table "state 6. life warning" of FIG.

1.6.4 State of Light-Emitting Diode D4 for Recharging Required Display Light-emitting diode D4 is turned off.

The operation result of the circuit can be simply expressed as the order of explanation 30 to 41 in the truth table "state 6. life warning" of FIG.

1.6.5 State of Charge Completion Display Light Emitting Diode D3 The light emitting diode D3 is turned off.

The operation results of the circuit can be simply expressed as the order of explanation 42 to 47 in the truth table "state 6. life warning" of FIG.

1.6.6 State of Light-Emitting Diode D5 for Displaying Life Warning The light-emitting diode D5 goes from being extinguished to being lit.

The operation result of the circuit can be simply expressed as the order of explanation 48 to 52 in the truth table "state 6. life warning" of FIG.

2. State change 2.1 Charging when the specific rechargeable battery is not partitioned by discharging 2.1.1 Charging after discharge (1) Operation transition when the specific rechargeable battery is normal The state changes from 1 → 2 → 3 → 4.

(2) Operation transition when the specified rechargeable battery has reached the end of life The state changes from 1 → 2 → 3 → 6.

2.1.2 Charging Without Discharging (1) Transition of Operation when Specific Rechargeable Battery is Normal State 2 → 3 → 4.

(2) Operation transition when the specified rechargeable battery has reached the end of life The state changes from 2 → 3 → 6.

2.2 Charging after deep (complete) discharge of the specific rechargeable battery 2.2.1 Operation transition when the specific rechargeable battery is normal The state (1) → 2 → 3 → 4 changes.

2.2.2 Operation transition when the specified rechargeable battery has reached the end of life The state (1) → 2 → 3 → 6 changes.

2.3 Charging after over-discharging of the specific rechargeable battery 2.3.1 Transition of operation when the specific rechargeable battery is normal State (1) → 2 → 5 →→ State 1 → 2 → 3 → 4 or state It changes from 2 → 3 → 4.

2.3.2 Transition of operation when the life of the specific rechargeable battery is reached State (1) → 2 → 5 or state (1) → 2 → 3 → 6 →→ state (1) → 2 → 5 Or state (1) → 2 → 3 → 6 → → state (1) → 2 → 5 or state (1) → 2 → 3 → 6 → → ... changes.

2.4 Overlapping charge when the specific rechargeable battery has completed charging 2.4.1 Charge state after discharging The state changes from 1 → 2 → 3 → 4.

2.4.2 Charge state when discharging is not performed (2) → (3) → 4

In addition, in the item described in "2", a number indicating a state with () attached indicates that the state immediately shifts to the next state.

The inventions made by the present inventors are as follows.
Although the specific description has been given based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in addition to the above-described embodiments, the light emitting diodes D1 to D5, the relay coils RL1 and RL are used.
2. All circuits other than the relay switches SWR1-1 and SWR1-2 and SWR2 may be integrated into an IC and applied.

Up to now, what has been simply referred to as a relay has been a mechanical relay, but if a necessary contact current capacity can be secured, a semiconductor switch or the like may be used instead of the relay. If this is possible, it is possible to realize an IC including these.

What has been described so far is merely to make full use of the logic circuit, but the function corresponding to the circuit of FIG.
You may implement | achieve by controlling with a computer.

Further, if the mother device side using the specific rechargeable battery BTT is the computer itself, or if it is equipped with a computer function, the above-mentioned method is performed in parallel with the main operation to substitute them. Good.

Furthermore, although the main body of the charger with the discharging function has been described so far, the charger body having the discharge function is housed in an appropriate case so that the specific rechargeable battery BTT can be mounted or the specific rechargeable battery BTT can be installed. By mounting the battery BTT on the side of the host device using the battery BTT and using it in combination with the case accommodating the charger with a discharge function, a charger with a discharge function is realized.

Further, the charger with a discharging function may be structured to be housed together with the specific rechargeable battery BTT on the side of the base device depending on the application where the small size and light weight are not required.

[0200]

The outline of the typical inventions among the inventions disclosed in the present application will be briefly described as follows.

That is, it is possible to prevent the decrease of the charge capacity due to the memory effect and always secure the maximum charge capacity.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a charger with a discharge function to which the technique of the present invention is applied.

FIG. 2 is a diagram showing a flowchart of an operation example of a main part of a charger with a discharge function of the present invention.

FIG. 3 is a specific circuit diagram of a charger with a discharge function to which the technique of the present invention is applied.

FIG. 4 is a truth table showing the operation of the circuit shown in FIG.

[Explanation of symbols]

 Specific battery such as BATT Ni-Cd battery 101 Charge circuit 102, 103 Voltage detection circuit 104 Discharge circuit 105 Control logic circuit 106 Monitor display section 107 Button switch as operation section

Claims (1)

[Claims] 1. A charging circuit for charging a battery, a discharging circuit for discharging the battery, and a discharging circuit for charging when the battery is at or above a prescribed deep discharged voltage. And a control circuit that causes the charging circuit to perform charging after the battery is discharged to the voltage after the deep discharge.