Charging voltage distribution apparatus for series batteries

A charging voltage distribution device for series batteries, which device is adapted to be connected in parallel with a battery of the series batteries, comprising:

• a bypass circuit connected in parallel with the battery and including a switching device;
• and
• a control circuit for continuously variably controlling an amount of current flowing through said bypass circuit according to a charging voltage applied to the battery;
• wherein said control circuit includes a first reference voltage generator for generating a first reference voltage, a first voltage detecting circuit for detecting a first voltage corresponding to the charging voltage applied to the battery, and a control signal output circuit for determining a first voltage difference between said detected first voltage and said first reference voltage and for outputting a control signal which varies according to said first voltage difference, said switching device being turned on when supplied with said control signal;
• and
• wherein said control signal output circuit supplying the switching device with the control signal in the form of a series of pulses at those intervals of time which vary according to said first voltage difference, thereby changing that on-off duty ratio of the switching device which determines a turn-on duration of the switching device.

A charging voltage distribution apparatus for series batteries, comprising:

• bypass circuits including switching devices;
• and
• a control circuit for controlling an amount of current to be routed into said bypass circuits according to the voltage of a battery connected to said bypass circuits;
• said control circuit including:
• reference voltage generators for generating reference voltages;
• voltage detecting circuits for detecting voltages corresponding to battery voltage;
• a control signal output circuit for calculating a voltage difference among said detected voltages and reference voltages and outputting control signals according to said voltage difference;
• and
• circuits for actuating said switching devices in said bypass circuits according to said control signals;
• wherein when a voltage difference between voltages provided by a pair of said reference voltage generator and voltage detecting circuit becomes zero, said switching devices close said bypass circuits to cause said duty ratio of the on- and off-state durations of said switching devices to increase, while when a voltage difference between voltages provided by the other pair of said reference voltage generator and voltage detecting circuit becomes zero, said switching devices prevent said duty ratio from increasing.