A battery charger circuit having a temperature-dependent constant voltage region, a constant current region, and a power dissipation limiting current "foldback" region.

Battery charger circuit

A current sense voltage is derived which is proportional to the current to be limited. The current sense voltage is applied in phase opposition to a difference voltage obtained by opposing the base-to-emitter diode voltage drops of a temperature compensating transistor and a current control transistor for substantially reducing the value of the current limit sense voltage necessary to cause current limiting. Temperature compensation is obtained by superimposing a selected temperature compensating portion of the base-to-emitter diode drop of a temperature compensating transistor on the base-to-emitter turnon voltage of the current control transistor, whereby any desired temperature coefficient including zero is obtained for the current limiting circuit over the operating temperature range of - 55* C to + 125* C.

Current limiting circuit

A voltage-current conversion circuit comprises an input terminal, a conversion terminal, an output terminal, first and second emitter-coupled transistors having their bases respectively connected to the input terminal receiving an input signal and the conversion terminal, a current mirror load circuit connected to collectors of the first and second transistors, a constant current source connected to emitters of the first and second transistors, and an output transistor having its base connected to the collector of the second transistor and its emitter to the conversion terminal. When the collector of the output transistor is connected to the output terminal and an impedance element is connected to the conversion terminal, a current is provided at the output and conversion terminals which is obtained by dividing an input signal voltage applied to the input terminal with an impedance value of the impedance element. The voltage-current conversion circuit serves as a negative current conveyor. When the collector of the output transistor is connected to an input terminal of a current mirror having its output terminal connected to the output terminal of the conversion circuit, the converting circuit serves as a positive current conveyor. Proper combinations of the positive and/or negative current conveyors provide various analog computation circuits.

Voltage-current conversion circuit

A control transistor (3) is connected between a power supply terminal (1) and an output terminal (19). The base bias of the control transistor (3) is controlled by bias control transistors (12, 13), thereby the output voltage is maintained at a constant value. An overcurrent state is detected by a current control detecting transistor (22), and the base bias of the control transistor (3) is controlled by the bias control transistors (12, 13), so as to prevent the overcurrent. The current control detecting transistor (22) further detects the time when the potential of the output terminal (19) becomes approximately 0 V by, e.g., short-circuiting of a load, so as to control the base bias of the control transistor (3) through the bias control transistors (12, 13), thereby the current to the load is decreased to a value considerably smaller than a limited value for preventing the overcurrent.

Constant-voltage power supply circuit

Overload protection circuit

Short circuit protection device

Short circuit protection for a transistorized power supply

Multiplexing circuit with feedback to a constant current source

Transistor current control circuit

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Short circuit protection device

Short circuit protection for a transistorized power supply

Multiplexing circuit with feedback to a constant current source

Transistor current control circuit