SIMULATED BATTERY LOGIC TESTING DEVICE
First Claim
1. A simulated battery test device for checking the operation of a battery charging circuit and logic circuitry comprising:
- an operational amplifier that generates a low simulated battery voltage in response to a battery low control signal that is used to adjust a reference voltage to said low simulated battery voltage, and that generates a battery open condition in response to a battery open control signal that is used to turn off said operational amplifier;
a resistor that is connected in-line with said battery charging circuit;
a comparator connected across said resistor that measures a voltage drop across said resistor that is representative of a current charging signal generated by said battery charging circuitry, and that generates a voltage difference signal that is proportional to said voltage drop across said resistor;
an analog-to-digital converter that generates a digital signal, using a reference voltage, said digital signal being representative of a magnitude of said current charging signal.
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Abstract
A simulated battery test device and method that is capable of testing a battery charging circuit and logic circuit to determine proper operation. An operational amplifier is used that can both source and sink current to simulate the operation of the battery. A battery low signal can be generated using the simulated battery test device to test a battery charging circuit and logic circuit in a battery low condition. In addition, a battery open signal can be generated to test the battery charging and logic circuit in a battery open condition. Charging currents are detected to determine if currents fall within an acceptable range.
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Citations
4 Claims
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1. A simulated battery test device for checking the operation of a battery charging circuit and logic circuitry comprising:
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an operational amplifier that generates a low simulated battery voltage in response to a battery low control signal that is used to adjust a reference voltage to said low simulated battery voltage, and that generates a battery open condition in response to a battery open control signal that is used to turn off said operational amplifier; a resistor that is connected in-line with said battery charging circuit; a comparator connected across said resistor that measures a voltage drop across said resistor that is representative of a current charging signal generated by said battery charging circuitry, and that generates a voltage difference signal that is proportional to said voltage drop across said resistor; an analog-to-digital converter that generates a digital signal, using a reference voltage, said digital signal being representative of a magnitude of said current charging signal.
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3. The simulated battery test device of claim 5 further comprising:
a zener diode that generates said low simulated battery voltage in response to said battery low control signal.
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4. The simulated battery test device of claim 4 further comprising:
a load connected to said simulated battery test device that causes said simulated battery test device to generate a current hold-up signal that is measured by said resistor, said comparator and said analog to digital converter to determine if said current hold-up signal is within a predetermined range of values. - View Dependent Claims (2)
Specification