JPH11338585A - Power supply controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply controller which detects and displays the capacity of a dry battery without powering on a circuit block. SOLUTION: Under the control of a CPU 5, the output voltage of the dry battery 1 is supplied to a dummy load RL by a measurement switch 2 and a voltage measuring circuit 3 measures its internal resistance Ri. To judge whether or not the block circuit of a load Z1 can be powered on, the voltage drop is estimated from a current I1 stored in a storage circuit 6, flowing to the load Z1 when the block circuit is powered on and the internal resistance Ri and if the voltage drop exceeds the limit of the stop voltage of the dry battery 1, it is judged that the block circuit can not be powered on; and the CPU 5 does not turn on a power switch S1 and controls a display means 4 to warm and display that the block circuit can not be used and respective block circuits are similarly processed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device, and more particularly, to a power supply control device for controlling a power supply control device according to the capacity of a dry battery.
The present invention relates to a power supply control device provided with a PU.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional power supply control device such as a personal computer, a word processor, a portable terminal or the like that operates on a dry battery includes a dry battery 1 having an internal resistance Ri and a circuit block connected to the dry battery 1. Loads Z1, Z2,..., A voltage measuring circuit 3 typified by an A / D converter for reading the voltage of the dry battery 1, and power switches S1, S2 typified by transistors for supplying / stopping the power of the dry battery 1.
And a CPU 105 for controlling the power switches S1, S2, and the voltage measuring circuit 3 to output an alarm signal, and a display means 4 for displaying the alarm signal from the CPU 105.

[0003] As shown in FIG. 3, the conventional power supply control device first operates when the capacity of the dry battery 1 is reduced.
When the voltage drop is directly read by the voltage measuring circuit 3 and it is determined that the voltage is close to the end voltage, the display means 4 calls attention and turns off the power switches S1, S2,. When supplying / stopping power separately, stop the power supply even if the read voltage is somewhat higher than the cutoff voltage, or turn off the power when the output voltage approaches the cutoff voltage by turning on the power to the block circuit. The output voltage of the dry battery is directly read regardless of the load at that time, and the subsequent operation is determined.

[0004]

However, in the conventional power supply control device, when turning on / off the power of each of the divided block circuits for power saving, the voltage before the power is supplied to the block circuit is reduced. Since the power supply is stopped at a position somewhat higher than the final voltage of the dry battery and the user is warned by a display means or the like, there is a problem that the power supply is stopped even if the capacity of the dry battery is sufficient to operate the block circuit. Was.

[0005] Further, since the internal resistance of a dry battery greatly increases with a decrease in capacity, when the power supply is turned on to the block circuit and the output voltage approaches the end voltage, the power supply is turned off. As a result, the dry battery with increased internal resistance reaches the cutoff voltage at once with a sudden voltage drop, and it cannot supply enough power to operate the entire device.
There was a problem of destroying data due to runaway and stop of the system.

An object of the present invention is to provide a power supply control device for detecting and displaying the capacity of a dry battery without turning on the power to the block circuit.

[0007]

In order to solve the above-mentioned problems, a power supply control device according to the present invention comprises a dry battery, a dummy load serving as a load for the dry battery, and a measurement switch for connecting the dry battery to the dummy load. And a voltage measurement circuit for measuring the internal resistance value of the dry battery by measuring the output voltage of the dry battery connected by the measurement switch, and the output voltage provided for each block circuit divided into a plurality of blocks. A plurality of power switches for supplying power, a storage circuit in which a current value of a current flowing through each block circuit of the output voltage supplied by the plurality of power switches is stored in advance, and a current value stored in the storage circuit. And calculating a voltage drop of the dry battery when the power switch is turned on and the output voltage is supplied to the block circuit based on the internal resistance value of the dry battery. When it is calculated that the end voltage of the pond has been reached, the CPU is configured to transmit a warning signal without turning on the power switch, and display means for displaying the warning signal transmitted from the CPU. I do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a power supply control device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a power supply control device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the internal resistance measurement of the power supply control device according to one embodiment of the present invention.

As shown in FIG. 1, a power supply control device according to an embodiment of the present invention includes a dry battery 1, a dummy load RL serving as a load on the dry battery 1, a dry battery 1 attached to the dummy load RL.
, A voltage measurement circuit 3 that measures the output voltage of the dry cell 1 connected by the measurement switch 2 to measure the internal resistance Ri of the dry cell 1, and a block circuit divided into a plurality of blocks. And a plurality of power switches S1, S2,... For supplying an output voltage, and a current value of a current flowing through each block circuit of the output voltage supplied by the plurality of power switches S1, S2,. Based on the storage circuit 6 stored in advance and the current value stored in the storage circuit 6, a voltage drop of the dry battery 1 when the power switches S1, S2,. When it is calculated that the final voltage of the dry battery 1 is reached, the CPU 5 sends a warning signal without turning on the power switches S1, S2,..., And displays the warning signal sent from the CPU 5. Constituted by the display means 4 that.

As shown in FIG. 2, the internal resistance Ri of the dry battery 1 is the voltage VO measured by the voltage measurement circuit 3 when the circuit is open, and the voltage VL when the measurement switch 2 is turned on and the pseudo load RL is connected. Where IL is the current flowing through the dummy load RL, Ri = (VO−VL) / IL = ((VO−VL) / V
L) × RL is calculated.

Next, the operation of the power supply control device according to one embodiment of the present invention will be described with reference to the drawings.

The operation of the power supply control device according to one embodiment of the present invention is formed by adding some circuits to an internal resistance measuring circuit as shown in FIGS.
Under the above control, the internal resistance of the current dry cell 1 is measured by the dry cell 1, the dummy load RL, and the measurement switch 2, and if the load Z
When it is determined whether the power can be turned on to one of the block circuits, the voltage drop Vdrop from the current I1 flowing through the load Z1 when the power of the block circuit is turned on and stored in the storage circuit 6 in advance.
p is obtained by Vdrop = Ri × I1, and (V
O-Vdrop) is calculated to be lower than the cut-off voltage of the dry cell 1 and it is determined that the block circuit does not have the ability to turn on the power when the CPU 5 turns off the power switch S1. 4 to display a warning, and each block circuit is similarly processed.

[0015]

As described above, according to the power supply control device of the present invention, when the current is applied to the block circuit based on the measured internal resistance of the present dry battery and the current value of the block circuit stored in advance. Since the voltage of the dry battery can be predicted in advance, it is possible to determine whether each block circuit can be operated without turning on the power to the block circuit, so that the power supply control of the entire apparatus can be performed more safely, and the final voltage of the dry battery is determined in advance. Therefore, the dry battery can be fully used to the end, so that there is an effect of preventing data destruction due to runaway and stop of the system caused by interruption of the stop voltage due to excessive use.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply control device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of internal resistance measurement of the power supply control device according to one embodiment of the present invention.

FIG. 3 is a block diagram of a conventional power supply control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dry battery 2 Measurement switch 3 Voltage measurement circuit 4 Display means 5 CPU 6 Storage circuit Ri Dry battery (internal resistance) RL Pseudo load S1, S2, Power switch Z1, Z2, Block circuit (load)

Claims (1)

[Claims] 1. A dry battery, a dummy load serving as a load of the dry battery, a measurement switch for connecting the dry battery to the dummy load, and an output voltage of the dry battery connected by the measurement switch is measured to measure the dry battery. A voltage measuring circuit for measuring an internal resistance value, a plurality of power switches provided for each of the block circuits divided into a plurality of blocks to supply the output voltage, and the output supplied by the plurality of power switches A storage circuit in which a current value of a current flowing in each of the block circuits is stored in advance, and based on the current value stored in the storage circuit and the internal resistance value of the dry cell, the power switch is turned on to the block circuit. Calculate the voltage drop of the dry battery when the output voltage is supplied, and calculate the voltage drop when the final voltage of the dry battery is reached, without turning on the power switch. A power supply control device comprising: a CPU for transmitting a warning signal; and display means for displaying the warning signal transmitted from the CPU.