摘要:
An acceleration switch includes a mass body having a space therein, a single arc-shaped beam supporting the mass body, a support portion supporting the arc-shaped beam, and a counter electrode disposed in the space of the mass body. The arc-shaped beam is arranged so as to surround the mass body, and the support portion is disposed at a periphery of the mass body. An electrode interval corresponding to a distance between an inner side surface of the mass body and an outer side surface of the counter electrode is 1 μm or more and 20 μm or less.
摘要:
A switching circuit has input terminals, switching MOS transistors, and a control circuit having a control terminal. Diodes are connected between the respective input terminals and the control circuit. When input voltage (V1, V2) are applied to the input terminals, the output terminal is selectively put in either a fixed or a floating state according to the voltage applied to the control terminal.
摘要:
The voltage regulator of the boosting/lowering type is comprised of a switching regulator block and a series regulator block, which are cascade-connected to each other. One input terminal of an error amplifier of the switching regulator block is connected to a dividing node of bleeder resistors in the series regulator block to constitute a regulative feedback loop effective to improve an efficiency of the voltage regulator.
摘要:
In a signal processing circuit for an acceleration switch, it has been difficult to realize a circuit in which, when a system is powered off, almost no current is consumed, and, when vibration is applied, a sensor is activated to start detecting acceleration. In a signal processing circuit, one terminal of an acceleration switch is connected to a main determination section, another terminal of the acceleration switch is connected to one of a power supply control section and a power supply, and the main determination section determines occurrence of vibration applied to the acceleration switch. Based on a result of the determination, the power supply control section controls supply of power to one of a main control section or a sensor.
摘要:
By utilizing a plurality of charge storing elements, a delay circuit may be reduced in size and cost. A delayed output signal is produced a predetermined time period after detection of an input signal by selectively charging and discharging each of a plurality of charge storage units either concurrently or successively and by detecting the charge level of each respective charge storage element. When the charge level of the respective charge storing elements indicates that a predetermined period of time has transpired since detection of the input signal, a delayed output signal is generated. This operation is performed in one embodiment by simultaneously charging two capacitors, comparing the voltage level of one capacitor with a reference potential, and inverting an output signal when the level reaches the predetermined reference potential. The second capacitor is used to tie the output to this level while the first capacitor discharges. In another embodiment, capacitors are charged and discharged in cycles and a counter is used to count the number of charge/discharge cycles. When the count reaches a predetermined number, the output signal is generated. Accordingly, a delay circuit may be produced without the need for large capacitors and resistors and may be formed in a monolithic integrated 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:
In a delay circuit using the charging and discharging of a capacitor for setting a delay time, there is provided means for monitoring the terminal voltage across the capacitor, and recognizing whether it is a normal voltage, or not, by using an external signal.
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 has a voltage detector for detecting a voltage level of a secondary cell, a switch connected in series with the secondary cell, and a control circuit connected in parallel with the voltage detector for receiving and processing an output signal of the voltage detector and controlling an impedance of the switch. The voltage detector, the switch and the control circuit are integrated in a single substrate. In a preferred embodiment, the switch comprises an external connection terminal and a second terminal connected to the secondary cell, a first IGFET connected between the first and second terminals, a second IGFET connectected between the first terminal and a substrate electrode of the first IGFET, and a third IGFET connected between the second terminal and the substrate electrode of the first IGFET.
摘要:
A switching circuit has input terminals, switching MOS transistors, and a control circuit having a control terminal. Diodes are connected between the respective input terminals and the control circuit. When input voltage (V1, V2) are applied to the input terminals, the output terminal is selectively put in either a fixed or a floating state according to the voltage applied to the control terminal.