Battery-less sensor circuit

1. A battery-less sensor circuit, comprising:

a power generation element;

a first switching element;

a voltage control circuit;

a first storage capacitor;

a sensor circuit; and

a load,

wherein the power generation element is connected to the first storage capacitor via the first switching element,

wherein a power supply terminal of the sensor circuit is connected to an input terminal of the first switching element,

wherein the voltage control circuit is configured to control a current passing through the first switching element through reception of a voltage of the input terminal of the first switching element, and

wherein the load is connected to the first storage capacitor and the sensor circuit.

2. The battery-less sensor circuit according to claim 1 , further comprising a second storage capacitor and a voltage detection circuit,

wherein the second storage capacitor is connected to the sensor circuit, and

wherein the voltage detection circuit is configured to control the load through reception of a voltage stored in the second storage capacitor.

3. The battery-less sensor circuit according to claim 2 , wherein a capacitance value of the second storage capacitor is set to such a capacitance value that, as compared to a time period required for the first storage capacitor to be charged to a first predetermined voltage through output of the power generation element, a time period required for the second storage capacitor to be charged to a second predetermined voltage through output of the sensor circuit becomes longer.

4. The battery-less sensor circuit according to claim 2 , wherein the voltage detection circuit is to be driven by input electric power of the first switching element.

5. The battery-less sensor circuit according to claim 2 , further comprising:

a delay circuit configured to supply an output signal of the voltage detection circuit with a delay of a predetermined time period; and

a second switching element to be controlled by a signal supplied from the delay circuit,

wherein the second switching element is used to discharge the second storage capacitor.

6. The battery-less sensor circuit according to claim 1 , further comprising a first booster circuit arranged between the power generation element and the first switching element.

7. The battery-less sensor circuit according to claim 1 , wherein the load includes a second booster circuit connected to the first storage capacitor.