Drive circuit for a lamp
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United States of America Patent
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Apr 15, 1997
Grant Date -
N/A
app pub date -
Jun 1, 1995
filing date -
Jun 1, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive circuit for a solar lamp includes a thermistor TH1 that reduces a power supply to a lamp if a Mosfet Q1 to which it is physically mounted becomes too hot. Also, a resistor R37 sets at low voltage level below which the battery will be isolated. This serves to set a lower but safe level than the voltage at which the circuit in block A isolates the battery during optimum operating conditions of the lamp. Such components prevent or at least inhibit the possibility of the battery being discharged beyond a level from which it cannot recover.
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