Abstract: A booster control device includes an output voltage detection unit that detects output voltage of a booster which changes the output voltage according to a phase difference; a storage battery voltage detection unit that detects storage battery voltage; and a booster control unit that performs feedback control on the output voltage of the booster in order for a difference between an output voltage command value to the booster and detected output voltage to be equal to zero. Further, the booster control unit includes a gain control unit that corrects a control gain according to the storage battery voltage on the basis of storage battery voltage dependency of an input-output characteristic representing booster output with respect to a phase difference of the booster, in order for the booster output to have the control gain uniquely determined by the phase difference and outputs a control phase difference to the booster.

Abstract: A hybrid work machine includes: a generator motor that is connected to a drive shaft of an internal combustion engine; a storage battery that stores at least power generated by the generator motor; a motor that is driven by at least one of the power generated by the generator motor and power stored in the storage battery; a booster that includes two bridge circuits each having a plurality of switching elements and is provided between the generator motor as well as the motor and the storage battery; and a booster control unit that sets a phase difference between voltages output by the bridge circuits to be zero during standby in which servo control on both the generator motor and the motor is turned off.

Abstract: In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. An external voltage applied between the DC terminals of the AC link type booster is divided by the voltage-type inverters.

Abstract: Provided is a switching control method of a transformer coupled booster to suppress an increase in energizing current in a transformer of the transformer coupled booster and downsize the transformer coupled booster. A primary coil current that flows through a primary coil of the transformer, and a secondary coil current that flows through a secondary coil of the transformer are detected. The current difference between the detected primary coil current and the detected secondary coil current is calculated. Based on the calculated current difference, the cycle of ON/OFF periods of four arms provided on the transformer coupled booster is maintained at a constant level. Control is carried out so that the ratio of the first arm's ON period to the OFF period is always equal to the ratio of the third arm's ON period to the OFF period.

Abstract: A control device of a transformer coupling type booster performs switching control of applying ON/OFF switching signals to the respective switching elements and alternately repeating, at a predetermined cycle, a voltage positive polarity period where an inter-terminal voltage of the low-voltage side winding and an inter-terminal voltage of a high-voltage side winding have a positive polarity, and a voltage negative polarity period where those inter-terminal voltages have a negative polarity. Upon performing the foregoing control, added is control of providing a zero voltage period between the voltage positive polarity period and the voltage negative polarity period of the inter-terminal voltage of the low-voltage side winding and the inter-terminal voltage of the high-voltage side winding in order to lower a transformer effective current value.

Abstract: Provided is a switching control method of a transformer coupled booster to suppress an increase in energizing current in a transformer of the transformer coupled booster and downsize the transformer coupled booster. A primary coil current that flows through a primary coil of the transformer, and a secondary coil current that flows through a secondary coil of the transformer are detected. The current difference between the detected primary coil current and the detected secondary coil current is calculated. Based on the calculated current difference, the cycle of ON/OFF periods of four arms provided on the transformer coupled booster is maintained at a constant level. Control is carried out so that the ratio of the first arm's ON period to the OFF period is always equal to the ratio of the third arm's ON period to the OFF period.

Abstract: In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. An external voltage applied between the DC terminals of the AC link type booster is divided by the voltage-type inverters.