Drive apparatus, control method for the drive apparatus, storage medium storing a program controlling the drive apparatus, and power output apparatus
View Patent ↗An electronic control unit ( 40 ) calculates the current flowing through a reactor (L) by dividing an output required BP* of a battery ( 32 ), obtained from converting the power required by a motor ( 22 ), by a terminal voltage Vb of the battery ( 32 ). A carrier frequency (optimum carrier frequency) is set for transistors (T 7 , T 8 ) where the loss of a DC/DC converter ( 34 ) is minimized from the calculated current, and the DC/DC converter ( 34 ) is controlled at the set switching frequency.
1. A drive apparatus comprising:
a DC/DC converter having an energy storing device capable of storing DC current as energy, and being capable, by using the energy storing device, of performing DC/DC conversion on an input DC voltage by the switching of a switching element and outputting to a load;
a power source capable of outputting DC power to the DC/DC converter;
a controller for setting a switching frequency for the switching element on the basis of loss characteristics of the DC/DC converter corresponding to current flowing through the energy storing device, and for controlling the switching of the switching element at the set frequency.
2. A drive apparatus according to claim 1 , wherein loss characteristics of the DC/DC converter are obtained using loss characteristics of the energy storing device and loss characteristics of the switching element.
3. A drive apparatus according to claim 1 , comprising a current calculator for calculating the current flowing through the energy storing device on the basis of power required by the load and voltage of the power source.
4. A drive apparatus according to claim 1 , comprising a current detector for directly detecting the current flowing through the energy storing device.
5. A control method for a drive apparatus comprising a DC/DC converter having an energy storing device capable of storing DC current as energy, and being capable, by using the energy storing device, of performing DC/DC conversion on an input DC voltage by the switching of a switching element and outputting to a load, and a power source capable of supplying DC power to the DC/DC converter, comprising the steps of:
setting the switching frequency for the switching element on the basis of loss characteristics of the DC/DC converter corresponding to current flowing through the energy storing device; and
controlling the switching of the switching element at the set frequency.
6. In a medium for storing a program controlling the operation of a drive apparatus comprising a DC/DC converter having an energy storing device capable of storing DC current as energy, and being capable, by using the energy storing device, of performing DC/DC conversion on an input DC voltage by the switching of a switching element and outputting to a load, and a power source capable of supplying DC power to the DC/DC converter;
a computer readable storage medium in which is stored a program for executing by a computer:
a frequency set processing step for setting the switching frequency for the switching element on the basis of loss characteristics of the DC/DC converter corresponding to current flowing through the energy storing device; and
a control processing step for controlling the switching of the switching element at the set frequency.
7. A power output apparatus comprising:
a motor rotationally driven by a polyphase alternating current;
an inverter circuit capable of supplying polyphase alternating current power to the motor by the switching of a switching element;
a chargeable first power source that is connected to a positive bus line and a negative bus line of the inverter circuit;
a second power source that is connected to either the positive bus line or the negative bus line of the inverter and to a neutral point of the motor;
a controller for setting the switching frequency for the switching element on the basis of loss characteristics of a power converter capable of converting power from the second power source, and supplying to the first power source, including the switching element of the inverter and a coil of the motor, corresponding to current flowing through the neutral point of the motor, and for controlling the switching of the switching element at the set frequency.
8. A power output apparatus according to claim 7 , wherein loss characteristics of the power converter are obtained from loss characteristics of phase coils of the motor and loss characteristics of the switching element.
9. A power output apparatus according to claim 7 , comprising a current calculator for calculating the current flowing through the neutral point of the motor on the basis of the output required by the power output apparatus and the voltage of the second power source.
10. A power output apparatus according to claim 7 , comprising a current detector for directly detecting the current flowing through the neutral point of the motor.
11. A power output apparatus comprising:
a motor rotationally driven by a polyphase alternating current;
an inverter circuit capable of supplying polyphase alternating current power to the motor by the switching of a switching element;
a chargeable first power source that is connected to either one of a positive bus line or a negative bus line of the inverter circuit and to a neutral point of the motor;
a second power source that is connected to one of the positive bus line and the negative bus line, which is not connected with the first power source, of the inverter and to the neutral point of the motor;
a controller for setting the switching frequency for the switching element on the basis of loss characteristics of a power converter capable of converting power from the second power source, and supplying to the first power source, including the switching element of the inverter and a coil of the motor, corresponding to current flowing through the neutral point of the motor, and for controlling the switching of the switching element at the set frequency.
12. A power output apparatus according to claim 11 , wherein loss characteristics of the power converter are obtained from loss characteristics of phase coils of the motor and loss characteristics of the switching element.
13. A power output apparatus according to claim 11 , comprising a current calculator for calculating the current flowing through the neutral point of the motor on the basis of the output required by the power output apparatus and the voltage of the second power source.
14. A power output apparatus according to claim 11 , comprising a current detector for directly detecting the current flowing through the neutral point of the motor.