CONSTANT RESISTANCE TO CONSTANT CURRENT/CONSTANT POWER START-UP
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United States of America Patent
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Issued Date -
Jan 8, 2015
app pub date -
Jul 2, 2013
filing date -
Jul 2, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A constant current and constant power method and system for controlling current drawn from a voltage source uses an electronic load device such as one or more field effect transistors connected with the voltage source via a switch. The load device is configured as a resistance device. A constant resistance, a cutover voltage, and either a constant current or a constant power are set by the user for the voltage source. When the switch is closed, a fixed current is drawn from the voltage source to the load and the voltage from the source is measured. The measured voltage is compared with the cutover voltage. When the measured voltage is less than the cutover voltage, the current to the load is maintained in accordance with the measured voltage and the constant resistance. When the measure voltage exceeds the cutover voltage, the current to the load device is switched to a constant current or the load device is switched to constant power. This allows the voltage source to be gradually brought up to a desired output voltage.
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