摘要:
Provided is a voltage regulator capable of preventing a large current from flowing even when a battery (110) is connected with reverse polarity by mistake. The voltage regulator employs a circuit configuration in which a substrate potential (n-well) of an output transistor (103) of the voltage regulator is not fixed to a potential of a VDD terminal, and a power supply of a reference voltage circuit (101) and an error amplifier (102) is not fixed to the VDD terminal.
摘要:
A power generation circuit generates and stores electric power utilizing electromagnetic wave energy. The power generation circuit has one of an antenna or a coil that receives an electromagnetic wave. A rectifying circuit is formed on a silicon substrate and rectifies a signal from the antenna or the coil. A storage circuit stores an output power obtained from the rectifying circuit for driving a load. A MOS transistor has a source and a drain connected to an output of the storage circuit and the load, respectively, so that the load is connected to the storage circuit in accordance with a threshold voltage of the MOS transistor.
摘要:
Provided is a humidity sensor whose electrode is set to have an island-like configuration and is enclosed by a humidity sensitive film. As a result, in the humidity sensor, adhesion property between the humidity sensitive films on the electrode is enhanced and thus high reliability is achieved.
摘要:
A battery pack has a secondary battery connected to a plus side terminal. A protective circuit protects the secondary battery from overcharge and over-discharge. A calculation circuit operates with a minus side terminal as a reference for calculating a remaining capacity of the secondary battery. An N-channel MOS transistor is connected between the secondary battery and the minus terminal for controlling charge and discharge of the secondary battery in accordance with a signal from the protective circuit. A level shifter circuit is connected between the calculation circuit and a communication terminal.
摘要:
A power generation circuit using an electromagnetic wave which does not require any additional energy is provided. Power generation is performed by utilizing the electromagnetic wave existing in a space for living.
摘要:
In order to improve drive performance of a voltage regulator (on resistance of an output transistor) while suppressing increases in surface area resistance of an output transistor is reduced by changing the threshold voltage of the output transistor by controlling the back-gate voltages of output transistors of a voltage regulators.
摘要:
A charge/discharge control circuit is provided for an electric power source apparatus in which a service life is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge voltage detection circuit and a control circuit are connected in parallel to a secondary cell which is an electric power source, wherein the control circuit detects a condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal Vs for controlling a power supply to an external equipment and a charge by an external power source and controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the voltage dividing circuit.
摘要:
A charge/discharge control circuit is provided for an electric power source apparatus in which a service life is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge voltage detection circuit and a control circuit are connected in parallel to a secondary cell which is an electric power source, wherein the control circuit detects a condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal Vs for controlling a power supply to an external equipment and a charge by an external power source and controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the voltage dividing circuit.
摘要:
A charge/discharge control circuit is provided for an electric power source apparatus in which a service life is prolonged. A voltage dividing circuit, an overcharge voltage detection circuit, an overdischarge voltage detection circuit and a control circuit are connected in parallel to a secondary cell which is an electric power source, wherein the control circuit detects a condition of the secondary cell from the overcharge/overdischarge voltage detection circuits and outputs a signal Vs for controlling a power supply to an external equipment and a charge by an external power source and controls a switching element provided in series with the voltage dividing circuit and reduces a current which flows through the voltage dividing circuit.
摘要:
Provided is an ESD protection circuit for CDM capable of preventing a high current from flowing and preventing breakage when a battery is connected with reverse polarity. The ESD protection circuit employs a circuit configuration in which transistor elements are interposed in series to OFF transistors (11 and 13) included in the ESD protection circuit for CDM so that parasitic diodes of the transistor elements are connected to parasitic diodes of the OFF transistors in a reverse direction.