To provide a cheap inverter which uses a single digital microprocessor and can execute a current control and a maximum power control without changing a design of a hardware even for any switching device or solar cell, there is provided a control apparatus of an inverter for converting a DC electric power into an AC electric power by using a switching device, wherein the control apparatus is constructed by an inversion discrimination circuit 5 for receiving an output current or an output voltage and a reference signal and for discriminating whether a switching state of the switching device should be inverted or not and a gate pulse signal forming unit for changing the switching state of the switching device in response to an inversion request signal which is outputted from the inversion discrimination circuit. The gate pulse signal forming unit has a CPU 4 for forming a gate pulse signal by an interrupting process by using the inversion request signal as an interruption control signal.

Control apparatus of inverter and power generation system using such control apparatus

A vehicle door handle device, includes a cylinder lock for locking and unlocking a locking mechanism of an opening/closing panel, and a pair of pivot members pivotally attached to the opening/closing panel. One pivot member of the pair of pivot members is formed of a shutter capable of opening and closing a key insert hole of the cylinder lock, and another pivot member of the pair of pivot members has a pivotal force transmitting portion for transmitting a pivotal force in a direction to open the key insert hole to the one pivot member and is formed of an operating handle for opening and closing the opening/closing panel.

Vehicle door handle device

A gas-injection type refrigeration-cycle device has heat exchanger where refrigerant extracts waste heat from heating devices. In the refrigeration-cycle device, the mode is changed between where lower-pressure refrigerant extracts heat and where intermediate-pressure refrigerant extracts the heat of the hot water. The lower-pressure refrigerant is drawn into compressor, after heat exchanger is set at the lower-pressure side of the refrigeration cycle. The intermediate-pressure refrigerant is introduced into compressor-gas-injection port, after heat exchanger is set at the intermediate-pressure side of the refrigeration cycle. In another aspect, a defrosting mode of outdoor heat exchanger includes a heating mode, and gas refrigerant discharged from compressor flows through condenser without heat exchange. Thereafter, the flow of the gas refrigerant is divided to two portions, and the gas refrigerant of one portion flows into outdoor heat exchanger, thereby defrosting outdoor heat exchanger. The other portion flows into evaporator, thereby heating blown air within an air-conditioning duct by evaporator.

Refrigeration cycle device

Control signals for operating power converter switching elements (5l-56, 3l-36) are created using one-­chip microcomputers (l0, ll). Pulse patterns required to supply the control signals and their generating timings are previously created and scheduled in pairs. When the times when the control signals are to be supplied to the switching elements have actually come, those control signals are successively output.

Method and apparatus for controlling power converter

Door handle apparatus for automobile

PURPOSE:To accurately detect the AC current of an inverter by detecting the DC current of the inverter by a detector which can detect normal or reverse current and calculating with a signal proportional to the output frequency and a signal corresponding to a power factor. CONSTITUTION:A voltage type inverter is formed of a power converter 1, a capacitor 2 and a power inverter 3, thereby driving an induction motor 5. A detector 9 which can detect the normal and reverse currents is provided in a DC line, the voltage signal is divided by a divider 11 by a signal obtained by multiplying the signal of a frequency controller 9 which applies a trigger signal responsive to the output frequency to the power inverter 3 by a signal of a function generator 14 which generates a signal corresponding to the power factor as a function of the primary current of a motor 5, a coefficient K is multiplied, and an AC current is calculated. Accordingly, it can discriminate either the drive current or the regenerative current, and the AC current of the inverter can be accurately detected over wide range irrespective of the magnitude of the primary current.

Current detecting circuit

PURPOSE:To enable the control of phase stably and precisely over arbitrary fre- quency ragne by using a digital controller for a phase controller. CONSTITUTION:A digital signal is stored in an inverter output waveform data memory RAM14. Then, it is stored in the RAM14 in advance through a digital input interface 13A or the analog input interface 13B by a program for storing in the RAM12, and a PWM sinusoidal wave is directly outputted on the basis of the set frequency and voltage values to pulse amplifiers 16a, 16b, 16c with the programmable timers 15a, 15b, 15c as interfaces.

Pulse width modulation type inverter

PURPOSE:To ensure control power supply for an inverter from a main circuit DC power supply and voltage detection thereof at time of power interruption. CONSTITUTION:In a system where the control power supply for a control circuit 10A is obtained from the DC power supply for main circuit and the voltage thereof is detected in order to control the inverter body 6 and to protect the main circuit, the control power supply for a switching power supply 13 is provided by taking out DC power from the main circuit through a diode 11. Voltage of the main circuit is detected and divided by voltage division resistors 21, 22 to produce a DC voltage, lower than the voltage of the main circuit, for charging a backup capacitor 12. At the time of power interruption, power charged in the backup capacitor is fed to the switching power supply through a diode 23. This constitution allows accurate detection of the main circuit voltage up to the low voltage of the backup capacitor when the main circuit voltage begins to drop due to power interruption while ensuring the control power supply by means of the capacitor 12.

Circuit for dealing with power interruption of inverter

PROBLEM TO BE SOLVED: To accumulate the large amount of the regenerative energy of an electric car quickly and discharge the accumulated energy with a high speed to contribute to the travelling SOLUTION: A DC power of a battery 1 is converted into an AC power by an inverter 2 to drive a motor 3 by which driving wheels 5 are turned to travel When a battery voltage is high or when a braking pedal is stepped on, the battery voltage or the regenerative voltage from the inverter 2 is converted into an AC voltage by a flywheel inverter 20 and supplied to a flywheel motor 21 and a flywheel 22 is turned to accumulate an energy When the battery voltage is low or when a command pedal 6 is stepped on, an AC voltage generated by the motor 21 which is turned by the flywheel 22 is converted into a DC voltage by the flywheel inverter 20 and returned to the battery 1 and the inverter 2

Electric car driver

PURPOSE:To allow high performance drive control of a motor by detecting the voltage induced in a motor through the use of a detecting section conducting the dead time compensation, determining the frequency thereof, and restarting an inverter with the frequency thus determined. CONSTITUTION:The voltage induced in an inverter 22 on the AC output side is detected and then the frequency is detected by a frequency detecting circuit 80 based on the voltage detection signal. A pick-up switch 30 is turned ON by the frequency detection signal and then the inverter 22 is started by a dead time compensation circuit 100.

Hachiro Tomoyasu

Papers

Current detecting circuit

Pulse width modulation type inverter

Circuit for dealing with power interruption of inverter

Electric car driver

Drive control method for motor