Battery emulating power supply

Details Battery emulating power supply Battery emulating power supply

1999-06-02

2001-03-20

Wong, Peter S. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C324S548000, C327S563000

Reexamination Certificate

active

06204647

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to direct current power supplies and in particular to a power supply that emulates the characteristics of a battery.
An “ideal” power supply is normally defined as having zero impedance. Typically, power supplies are designed with an output impedance as close to zero as is practically possible or economically acceptable. A battery power source will not have a zero impedance and will, in fact, have an impedance that varies with, among other parameters, shelf-life and usage.
A manufacturer of a battery-powered device (e.g., a cellular phone) often will desire to test the device in operation without using a battery. To fully test the device with a power supply as the power source instead of a battery, it is desirable to emulate the voltage-current relationship exhibited by the battery.
In addition, as the power supply will typically be located remotely with respect to the device, it becomes important to be able to control the voltage-current relationship exhibited at the device as opposed to being exhibited at the power supply. For example, the voltage drop caused by the resistance of test leads will alter the voltage-current relationship at the device.
SUMMARY OF THE INVENTION
A power supply for providing a desired output impedance and a desired voltage or a desired current to a device under test (DUT) includes a DUT current sensing circuit, an operational amplifier having an inverting and a non-inverting input and an output, a DUT voltage sensing circuit, and an adjustable voltage source. The current sensing circuit provides a DUT current signal. The operational amplifier output is connectable to the non-inverting input through the current sensing circuit and the DUT. The DUT current signal is communicated to the inverting input. The voltage sensing circuit provides a DUT voltage signal that is communicated to the inverting input. The voltage source communicates with the inverting input. The power supply provides the desired output impedance and the desired voltage or the desired current to the DUT.


REFERENCES:
patent: 5677634 (1997-10-01), Cooke et al.

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