JPH089558A - Secondary battery voltage converter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a secondary battery voltage converter capable of changing the type of a secondary battery without changing the specifications of a constant voltage power supply circuit for electric and electronic devices and a charger. [Structure] Discharge voltage of different types of secondary batteries 2 is converted into a pseudo discharge voltage suitable for a specific secondary battery 1 conforming to the specifications of an electric device as a load 9 and output to be used in an electric device. A secondary battery voltage conversion device capable of changing a secondary battery from a specific secondary battery 1 to a different type of secondary battery 2, the voltage monitoring unit 4 of the different type of secondary battery and its detection. Command signal 5S of pseudo discharge voltage
And the command signal 5S
In response to this, a discharge control unit 10 including a DC / DC conversion unit 8 that converts the voltage of the secondary battery 2 into a pseudo discharge voltage and outputs the pseudo discharge voltage is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided on the output side of a secondary battery of an electric device or an electronic device equipped with a constant voltage power supply circuit using a specific secondary battery as a power source, and is used for different types of secondary batteries. The present invention relates to a secondary battery voltage conversion device that enables replacement of a secondary battery by converting a discharge voltage and a charging voltage into a value close to that of a specific secondary battery and outputting the converted value.

[0002]

2. Description of the Related Art In recent years, battery technology has been remarkably advanced. For example, a lithium battery as a primary battery, a lead storage battery, a silver oxide / zinc storage battery, a nickel / zinc secondary battery, a silver oxide /
Economical, electrical or electronic equipment designed to use any of the cadmium secondary batteries as a specific secondary battery power source,
There is a demand for exchanging nickel-cadmium storage batteries (hereinafter abbreviated as nicad batteries) for reasons such as lightness, thinness, shortness, and maintenance-freeness. However, since these secondary batteries have considerably different discharge characteristics and charging characteristics in addition to the constant voltage, depending on the type of battery, it is not possible to obtain consistency with the constant voltage power supply circuit provided on the output side of the secondary battery. The reality is that the type of battery cannot be changed easily.

[0003]

Therefore, when changing the type of the secondary battery, the constant voltage power supply circuit of the electric device or the electronic device or the external charger is replaced with a new secondary battery-compatible product. Will be required. However, replacing the constant voltage power supply circuit requires a major refurbishment of an electric device or an electronic device, and also requires an update cost of the external charger. Therefore, a large amount of repair costs and repair man-hours are required, and the economic effect obtained by changing the type of the secondary battery is lost due to this, and there is a problem that the implementation is difficult.

An object of the present invention is to provide a secondary battery voltage conversion device which enables the type of secondary battery to be changed without changing the specifications of the constant voltage power supply circuit and the charger for electric and electronic equipment. is there.

[0005]

According to the present invention, in order to solve the above-mentioned problems, the present invention is suitable for a specific secondary battery which meets the specifications of electric devices using the discharge voltages of different types of secondary batteries as loads. By converting to a pseudo discharge voltage and outputting it, it is possible to change the secondary battery used in the electric device from a specific secondary battery to a different type of secondary battery. A voltage monitoring unit of the secondary battery, a pseudo voltage generating unit that converts the detected voltage value into a command signal of the pseudo discharge voltage and outputs the command signal, and receives the command signal to convert the secondary battery voltage into a pseudo discharge voltage. DC / DC to output
And a conversion unit.

The pseudo discharge voltage is a set voltage value obtained by linearly approximating the discharge voltage vs. discharge capacity characteristic of a specific secondary battery between the full charge voltage and the discharge end voltage corresponding to zero discharge capacity. It is preferable. By converting the discharge voltage or charge voltage of different types of secondary batteries into a pseudo discharge voltage or pseudo charge voltage suitable for the specific secondary battery that conforms to the specifications of the electric device as a load, and outputting it, It is possible to change the secondary battery to be used from a specific secondary battery to a different type of secondary battery, the voltage monitoring unit of the different type of secondary battery, and the detected voltage value is the pseudo discharge voltage. And a discharge control circuit unit including a DC / DC conversion unit that receives the command signal and converts the secondary battery voltage into a pseudo discharge voltage and outputs the pseudo discharge voltage. Backflow prevention diode connected between secondary battery and external charger, charging switch, series circuit of charging voltage matching section, and DC / DC
The output pseudo-discharge voltage of the conversion unit comprises a pseudo voltage monitoring unit that issues an ON command toward the charge switch and the charge voltage matching unit when the discharge end voltage drops to the discharge end voltage, and the charge voltage matching unit is a specific secondary of the external charger. A charging control unit that converts an output voltage suitable for charging a battery into a pseudo charging voltage that matches the charging of a different type of secondary battery, and supplies the different type of secondary battery via the charging switch in the ON state. Be prepared.

[0007]

In the present invention, the secondary battery voltage converter is
A voltage monitoring unit for different types of secondary batteries, a pseudo voltage generation unit that converts the detected voltage value into a command signal of the pseudo discharge voltage and outputs the command voltage, and a secondary battery voltage that receives the command signal and outputs the pseudo discharge voltage. The pseudo voltage generating unit presets the detection voltage value of the voltage monitoring unit in accordance with the discharge voltage characteristic value of the specific secondary battery adapted to the load by being configured with the DC / DC converting unit for converting and outputting to Converted into pseudo discharge voltage value, DC
The output of the / DC converter is controlled to match the pseudo discharge voltage. Therefore, the secondary battery voltage conversion device as a whole operates to generate a voltage obtained by simulating the specific secondary voltage using any secondary battery as a power source, and the specific secondary battery is changed to a different type of secondary battery. Even if it is replaced, it is possible to output a pseudo discharge voltage similar to that when using a specific secondary battery to the load, so it is possible to discharge with a secondary battery of a type different from the constant voltage power supply circuit as the load, for example. A function that eliminates the nonconformity of the voltage characteristic value is obtained, and the discharge control function that enables the change of the type of the secondary battery without changing the specifications of the constant voltage power supply circuit of electric and electronic equipment is provided. A secondary battery voltage conversion device can be provided.

Further, in addition to the above discharge control function, the secondary battery voltage conversion device has a series of a backflow prevention diode, a charging switch, and a charging voltage matching unit connected between the secondary battery and an external charger. The circuit includes a circuit and a pseudo voltage monitoring unit that issues an ON command to the charge switch and the charge voltage matching unit when the output pseudo discharge voltage of the DC / DC converter decreases to the discharge end voltage. The output voltage of the battery is converted into a pseudo charging voltage that matches the charging voltage of the secondary battery, and the charging control unit that supplies the secondary battery through the charging switch in the ON state is configured as described above. When connecting a charger to the secondary battery voltage converter, the pseudo voltage monitoring unit senses that the pseudo discharge voltage has dropped to the discharge end voltage, turns on the charging switch, and charges the battery at the same time. Voltage rectifier engaging portion is converted on the output voltage of the external battery charger to different types of pseudo charging voltage matches the charging voltage of the secondary battery will be supplied to the secondary battery,
By using an external charger matched to a specific secondary battery, it is possible to automatically discharge and charge a secondary battery having characteristics different from the specifications of the external charger.

[0009]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a block diagram showing the configuration of a secondary battery voltage converter according to an embodiment of the present invention. In the figure, load 9
The electric equipment and the electronic equipment as described above include a constant voltage power supply circuit (not shown) on the input side of the battery power supply. Further, 1 is a specific secondary battery having discharge characteristics and charging characteristics that conform to the specifications of the constant voltage power supply circuit, 2 is a replacement secondary battery of a type different from the specific secondary battery 1, and for example, through a switch 3. Exchangeable D
The voltage monitoring unit 4 is connected to the C / DC conversion unit 8 and monitors the voltage change of the replacement secondary battery. The pseudo (discharge) voltage generation unit 5 stores a pseudo discharge voltage characteristic value corresponding to a discharge voltage characteristic value of the specific secondary battery 1 described later as internal data, and a predetermined conversion coefficient is applied to the detected voltage value of the voltage monitoring unit 4. It is converted into a pseudo discharge voltage value obtained by multiplication and output as a command value 5S to the DC / DC converter 8. DC
The / DC converter 8 comprises, for example, a buck-boost chopper circuit,
The output voltage of the replacement secondary battery 2 is converted into a pseudo discharge voltage value instructed by the command value 5S and output to the constant voltage power supply circuit in the load 9. As a result, even when the specific secondary battery 1 is replaced with a different type of secondary battery 2, it is possible to output the same pseudo discharge voltage to the load 9 as when using the specific secondary battery. It is possible to eliminate the incompatibility of the discharge voltage characteristic value between the constant voltage power supply circuit and a different type of secondary battery, and change the type of the secondary battery without changing the specifications of the constant voltage power supply circuit for electric and electronic equipment. It is possible to provide a secondary battery voltage conversion device that enables the above.

FIG. 2 is a characteristic diagram showing a method of setting the pseudo discharge voltage value in the secondary battery voltage converter according to the embodiment, and the curve 31 is the discharge characteristic curve of the specific secondary battery 1.
The change of the discharge voltage is represented by the percentage of the discharge capacity with respect to the constant capacity on the horizontal axis. Further, the curve 32 is a pseudo discharge characteristic curve, and its setting method is set by, for example, a method of linearly approximating between the full charge voltage V _s and the discharge end voltage V _e on the discharge characteristic curve 31 of the specific secondary battery. To be done. Therefore, when the specific secondary battery 1 is used, the voltage monitoring unit 4 detects the battery voltage that decreases with the elapse of the discharge time, and the pseudo voltage generating unit 5 changes the pseudo voltage to the pseudo discharge voltage having the same discharge capacity as the detected voltage. By converting and controlling the output of the DC / DC conversion unit 8 with the command value 5S, the secondary battery voltage conversion device operates as a pseudo battery power source, and the pseudo discharge characteristic curve 32 is displayed as the discharge capacity increases. It is possible to output a voltage that decreases along with it toward the constant-voltage power supply circuit of the load 9 and supply the constant-voltage to an electric device or an electronic device.

Further, when the secondary battery 2 of a different type is replaced, the conversion coefficient to the pseudo discharge characteristic curve 32 preset in the pseudo voltage generating section 5 is changed to the discharge voltage characteristic curve of the secondary battery 2 of a different type. By updating correspondingly, DC
At the output side of the / DC converter 8, a voltage that decreases along the pseudo discharge characteristic curve 32 with the increase of the discharge capacity is obtained, so that the matching of the voltage change width with the constant voltage power supply circuit of the load 9 is specified. It is maintained in the same manner as when the secondary battery 1 is used, and there is an advantage that the type of the secondary battery can be changed without the need to repair the electric device or the electronic device such as updating the constant voltage power supply circuit. .

FIG. 3 is a block diagram showing the configuration of a secondary battery voltage converter according to a different embodiment of the present invention, which is a discharge composed of a voltage monitor 4, a pseudo voltage generator 5, and a DC / DC converter 8. The charge control unit 11 for controlling the charge voltage from the external charger according to the type of the secondary battery is included in the control unit 10.
Is different from the above-described embodiment in that In the figure, a charging control unit 11 is a series circuit including a backflow prevention diode 15, a charging switch 14, and a charging voltage matching unit 13 which are connected between the specific secondary battery 1 or the replacement secondary battery 2 and the external charger 20. When the output pseudo discharge voltage of the DC / DC converter 8 drops to the discharge end voltage V _e , the ON command 12 is directed toward the charge switch 14 and the charge voltage matching unit 13.
And the pseudo voltage monitoring unit 12 that emits S, and the charging voltage matching unit 13 matches the output voltage of the external charger 20 that matches the charging voltage of the specific secondary battery 1 with the secondary battery 2 of a different type to be exchanged. It is configured to be converted into a pseudo charging voltage matching the charging voltage and supplied to the secondary battery via the charging switch 14 in the ON state.

Therefore, the external charger 20 is the secondary battery 1
If it is configured to perform constant voltage charging with an output voltage corresponding to the full charge voltage of the replacement secondary battery 2
The charging voltage matching unit 13 performs the voltage conversion so as to convert into the pseudo charging voltage corresponding to the full charging voltage of, and the charging voltage characteristic value with a different type of secondary battery without changing the specifications of the external charger. Specific rechargeable battery 1
Can be replaced with a different type of secondary battery 2 for discharge control and charge control.

[0014]

As described above, according to the present invention, the secondary battery voltage is changed so as to convert the discharge voltage of different kinds of secondary batteries into the pseudo discharge voltage suitable for the discharge characteristic of the specific secondary battery which meets the specifications of the load. The converter was constructed. As a result, since the discharge characteristics of different types of secondary batteries are different from that of specific secondary batteries, it is no longer necessary to repair electrical equipment or electronic equipment as a load that was conventionally required. It is possible to provide a secondary battery voltage conversion device that facilitates changing the type of secondary battery used.

When the pseudo discharge voltage, which decreases with the lapse of discharge time, decreases to the discharge end voltage, the output voltage of the external charger that matches the charge voltage of the specific secondary battery is sensed and the output voltage of the external charger is changed. If it is configured to add a charging control unit that supplies a pseudo charging voltage converted to the charging voltage of the secondary battery to the secondary battery of the different type to the above-mentioned secondary battery voltage conversion device, it becomes a problem in the conventional technology. Further, it is possible to provide a secondary battery voltage converter capable of changing the specific secondary battery to a different type of secondary battery and automatically controlling the charging and discharging thereof without changing the specifications of the external charger.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a secondary battery voltage converter according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a method of setting a pseudo discharge voltage value in a secondary battery voltage converter according to an embodiment.

FIG. 3 is a block diagram showing a configuration of a secondary battery voltage converter according to another embodiment of the present invention.

[Explanation of symbols]

 1 Specific Secondary Battery 2 Different Type Secondary Battery (Replacement Secondary Battery) 3 Power Switch 4 Voltage Monitoring Section 5 Pseudo (Discharge) Voltage Generator 8 DC / DC Converter 9 Load (Electrical Equipment, Electronic Equipment) 10 Discharge Control unit 11 Charging control unit 12 Pseudo voltage monitoring unit 13 Charging voltage matching unit 14 Charging switch 15 Reverse current prevention diode 20 External charger

Claims (3)

[Claims] 1. Use in the electric device by converting the discharge voltage of different types of secondary batteries into a pseudo discharge voltage suitable for a specific secondary battery that conforms to the specifications of the electric device as a load and outputting the pseudo voltage. It is possible to change the secondary battery from a specific secondary battery to a different type of secondary battery, the voltage monitoring unit of the different type of secondary battery, and the detected voltage value of the pseudo discharge voltage A pseudo voltage generating unit for converting into a command signal for output and a DC / DC converting unit for receiving the command signal and converting a secondary battery voltage into a pseudo discharge voltage for output. Secondary battery voltage converter. 2. A set voltage value obtained by linearly approximating a discharge voltage-discharge capacity characteristic of a secondary battery whose pseudo discharge voltage is specified, between a full charge voltage and a discharge end voltage corresponding to a discharge capacity of zero. The secondary battery voltage conversion device according to claim 1, wherein 3. By converting the discharge voltage or charge voltage of different types of secondary batteries into a pseudo discharge voltage or pseudo charge voltage suitable for a specific secondary battery that conforms to the specifications of electrical equipment as a load, and outputting the pseudo voltage or charge voltage. A secondary battery used in the electric device is changed from a specific secondary battery to a different type of secondary battery, wherein a voltage monitoring unit of the different type of secondary battery and its detected voltage value To a pseudo-discharge voltage command signal and outputs the pseudo-voltage generator, and a discharge control circuit unit including a DC / DC converter that receives the command signal and converts the secondary battery voltage to the pseudo-discharge voltage and outputs the pseudo-discharge voltage. When,
Backflow prevention diode connected between different types of secondary batteries and external charger, charging switch, series circuit of charging voltage matching unit, and output pseudo-discharge voltage of the DC / DC converter decreases to discharge end voltage. Then, the charging voltage matching unit comprises a pseudo voltage monitoring unit that issues an ON command to the charging switch and the charging voltage matching unit, and the charging voltage matching unit outputs different output voltages suitable for charging the specific secondary battery of the external charger. A secondary battery voltage conversion, comprising: a charging control unit that converts into a pseudo charging voltage that matches the charging of the secondary battery and supplies the pseudo battery to different types of secondary batteries via the charging switch in the ON state. apparatus.