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US 9,882,511 B2Granted
Piezoelectric power generation module and remote controller
AssigneeMurata Manufacturing Co., Ltd.
InventorsChikahiro Horiguchi, Kohei Takahashi
Life of this patent
Estimating the term…
Abstract
A piezoelectric device is connected in parallel with a diode, and outputs a power generation voltage when depressed. When the power generation voltage exceeds a first threshold voltage, a load switch control circuit makes a load switch be conductive, and when the generated voltage becomes lower than a second threshold voltage, the load switch is cut off. Further, when depression is released, the piezoelectric device is discharged by the diode such that the amount of charge remaining in the piezoelectric device becomes zero.
Claims17
A piezoelectric power generation device comprising:
- a piezoelectric device;
- a diode including a cathode and an anode connected in parallel to the piezoelectric device;
- a switch control circuit including a first and second input terminals respectively connected to the cathode and the anode of the diode, and an output terminal that outputs a switch control signal;
- and
- a switch connected to the first input terminal of the switch control circuit and that switches between a conductive state and an off state based on the switch control signal,
- wherein the piezoelectric device is a power generating device, and the switch is set to the conductive state when a voltage across the piezoelectric device is greater than a first threshold voltage that is greater than a reference potential, and
- wherein the piezoelectric device generates a voltage at a terminal of the piezoelectric device in response to a load being applied to the piezoelectric device, and the voltage across the piezoelectric device becomes the reference potential when the load applied to the piezoelectric device is released.
4 more elements
A piezoelectric power generation device, comprising:
- a piezoelectric device;
- a diode including a cathode and an anode connected in parallel to the piezoelectric device:
- a switch control circuit including a first and second input terminals respectively connected to the cathode and the anode of the diode, and an output terminal that outputs a switch control signal;
- and
- a switch connected to the first input terminal of the switch control circuit and that switches between a conductive state and an off state based on the switch control signal,
- wherein the switch control circuit includes a comparator circuit and a temperature compensation device connected in parallel with the first and second input terminals of the switch control circuit.
3 more elements
A piezoelectric power generation device, comprising:
- a piezoelectric device;
- a diode including a cathode and an anode connected in parallel to the piezoelectric device;
- a switch control circuit including a first and second input terminals respectively connected to the cathode and the anode of the diode, and an output terminal that outputs a switch control signal;
- and
- a switch connected to the first input terminal of the switch control circuit and that switches between a conductive state and an off state based on the switch control signal,
- wherein the switch control circuit comprises:
- first, second and third resistors connected in series between the first and second input terminals;
- an additional switch coupled to the first input terminal and a node between the first and second resistors;
- and
- a comparator have a non-inverting input coupled to a node between the second and third resistors, an inverting input that receives a voltage threshold, and an output coupled to the output terminal of the switch control circuit.
7 more elements
A remote controller comprising:
- a piezoelectric power generation device, including:
- a piezoelectric device,
- a diode including a cathode and an anode connected in parallel to the piezoelectric device,
- a switch control circuit including a first and second input terminals respectively connected to the cathode and the anode of the diode, and an output terminal that outputs a switch control signal, and
- a switch connected to the first input terminal of the switch control circuit and that switches between a conductive state and an off state based on the switch control signal;
- and
- an RF circuit connected to the piezoelectric power generation device and configured to communicate data during a period after a voltage at a terminal of the piezoelectric device exceeds a first threshold voltage and before the voltage reaches a second threshold voltage lower than the first threshold voltage.
4 more elements
Dependencies are inferred from the claim text.