Direct current power supply circuit having automatic linear and

Details Direct current power supply circuit having automatic linear and Direct current power supply circuit having automatic linear and

1990-01-12

1991-07-23

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323274, 323284, G05F 156

Patent

active

050346768

ABSTRACT:
A direct current power supply circuit converts an unregulated direct current input source such as an automobile battery to a regulated direct current output voltage for a device such as a mobile telephone requiring a fixed operating voltage. The circuit has an improved input to output voltage rating of less than two volts, enabling it to supply a load reliably with direct current power from an unregulated direct current source as low as ten volts. The circuit operates in a linear mode at low power levels and in a switching, pulse width modulated mode at higher output power levels. The circuit employs a three-terminal linear voltage regulator as a control element. It has input, output, and ground pins and is effective in response to current input through the input pin to maintain a predetermined, fixed voltage differential between the output and ground pins. In the example disclosed, the linear voltage regulator maintains a 5-volt differential between the output and ground pins. To provide fixed, stable 8-volt output, the circuit maintains a 3-volt potential at a reference junction connected to the ground pin. The linear voltage regulator seeks to maintain the 5-volt differential to thereby hold eight volts at the output pin. For high power requirements beyond the capacity of the linear voltage regulator, the circuit automatically varies the voltage at the reference junction to provide power pulses to the output of width and frequency required by the load.

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