Inverter ballast circuit
Control circuit providing constant power source
High-efficiency single-ended inverter circuit
Constant illumination flashlight
Apparatus to facilitate lengthening the life of incandescent lamps
Three-way power source circuit
Driving device for electro-luminescence
Fluorescent lamp power supply Patent #: 4920302
ApplicationNo. 442914 filed on 11/28/1989
US Classes:315/175, Diverse-type current supplies315/176, Simultaneous application to the load device315/291, CURRENT AND/OR VOLTAGE REGULATION315/307, Automatic regulation362/157SELF POWERED LAMP
ExaminersPrimary: Popek, Joseph A.
Assistant: Dinh, Son T.
International ClassH05B 037/02
AbstractA flashlight has a hybrid battery pack consisting of a primary-cell battery (ex: an Alkaline battery) and an auxiliary rechargeable battery of low internal resistance (ex: a Ni--Cad battery). Connected in circuit between the batteries and the flashlight's light bulb is a slide switch and an electronic control circuit. The slide switch has an OFF-position, an ON-position, and a spring-loaded variable BOOST-position. In full BOOST, the electronic control circuit operates such as to apply a voltage of about 1.5 times normal magnitude to the light bulb; thereby increasing the flashlight's light output by a factor of about 4.0 above normal. However, at that degree of BOOST, if indeed maintained on a continuous basis, the life of the light bulb will be shortened to about 15 minutes versus about 50 hours when used in the normal ON-position. The function of the auxiliary battery, which is controllably charged by the primary-cell battery, is that of permitting the size of the primary-cell battery to be much smaller than otherwise would be required to provide the increased power associated with the BOOST-position.
Field of SearchPortable light
SELF POWERED LAMP
Series connected current supplies
Discharge device and/or rectifier in one of the supply circuits
Diverse-type current supplies
Periodic switch in one of the supply circuits
PERIODIC SWITCH IN THE SUPPLY CIRCUIT
Simultaneous application to the load device
CURRENT AND/OR VOLTAGE REGULATION
Using choke and switch across source