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US 5,288,974 AGranted
Control arrangement for a seat heater
AssigneePlantron AB
InventorDirk Hanzic
Life of this patent
Estimating the term…
Abstract
A heating arrangement for heating a seat has a temperature responsive element and a control circuit for controlling the supply of electrical current to the heating element which is embedded in the seat. The control circuits formed of components mounted on a flexible printed circuit board.
Claims13
A heating arrangement for heating a seat, comprising:
- electrical heating means embedded in the seat;
- a flexible printed circuit board embedded in the seat;
- and
- components mounted on said flexible printed circuit board constituting temperature responsive means and control means, said temperature responsive means for sensing a temperature of the seat and providing a control signal whenever the sensed temperature is below a predetermined limit, said control means comprising a power transistor having electrodes for connection between a supply of electrical current and said electrical heating means, said power transistor further having a control electrode coupled to said temperature responsive means for receiving the control signal, said power transistor controlling the supply of electrical current to said electrical heating means in response to the control signal, and said control means further including a voltage doubler connected to the control electrode of said power transistor for doubling a voltage present on the current supply.
1 more element
A heating arrangement for heating a seat, comprising:
- electrical heating means embedded in the seat;
- a flexible printed circuit board embedded in the seat;
- and
- components mounted on said flexible printed circuit board constituting temperature responsive means and control means, said temperature responsive means for sensing a temperature of the seat and providing a control signal whenever the sensed temperature is below a predetermined limit, said control means including an oscillator to provide an oscillating output signal having an amplitude and a power transistor having electrodes for connection between a supply of electrical current and said electrical heating means, said power transistor further having a control electrode coupled to said temperature responsive means for receiving the control signal, said power transistor controlling the supply of electrical current to said electrical heating means in response to the control signal, and said control means further including a voltage doubler connected to the control electrode of said power transistor for doubling a voltage present on the current supply, said voltage doubler comprising a series connection of first and second diodes, the first diode being connected to a source of predetermined potential, and the output signal of the oscillator being connected to a node between the first and second diodes, so that output of the second diode comprises the sum of the predetermined potential and the amplitude of the oscillating output signal, the output at the second diode being connected to the control electrode of the power transistor, and said control means being adapted to provide a "low" signal to said control electrode to disable the power transistor.
1 more element
Dependencies are inferred from the claim text.