Voltage converter and computer-readable recording medium for recording program for making computer execute control for converting voltage in voltage converter
A technology of voltage conversion and voltage converter, which is applied in the direction of conversion equipment without intermediate conversion to AC, AC motor control, control system, etc., and can solve problems such as shortening service life and reducing power supply
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no. 1 example
[0093] FIG. 1 is a functional block diagram of a motor drive device having a voltage conversion device according to a first embodiment of the present invention.
[0094] Referring to FIG. 1, a motor drive device 100 includes a DC power supply B, voltage sensors 10, 20, system relays SR1, SR2, capacitors 11, 13, boost converter 12, inverters 14, 31, current sensors 24, 28, and Control device 30 .
[0095] Motor generator MG1 is mounted on, for example, a hybrid vehicle. Motor generator MG1 is connected to an engine (not shown) of the hybrid vehicle to function as an electric power generator driven by the engine, and may also function as, for example, an electric motor of the engine capable of starting the engine. Control is performed by adjusting the power generation torque of the motor generator MG1, thereby maintaining the engine in an effective operating state. Thus, good fuel economy and exhaust emissions of the hybrid vehicle can be achieved.
[0096] Motor generator MG...
no. 2 example
[0217] In the above-described embodiment, in the case where the on-duty ratio D_ON_1 is affected by the dead time Dt, the converter control means 302A to 302C proceed until the boosting operation is stopped under the condition that the DC power supply B is determined not to be damaged. state transition. Therefore, damage to the DC power supply B due to a sudden increase in the DC current Ib at the time of transition to the state in which the boosting operation is stopped can be avoided.
[0218] Alternatively, the DC power supply B may be protected from a sudden increase (hereinafter referred to as a surge) of the DC current Ib by allowing the on-duty D_ON_1 to be linearly controlled.
[0219] Then, the present embodiment discloses a voltage conversion device capable of linearly controlling the on-duty ratio D_ON_1.
[0220] FIG. 9 is a functional block diagram of an inverter control device 302G of a motor drive apparatus according to a second embodiment of the present invent...
no. 3 example
[0276] Regarding the first and second embodiments, an example in which the dead time Dt affects the duty ratio D_ON_1 has been described above. When the duty ratio D_ON_1 of the upper arm is in the region close to 1.0, the duty cycle The duty cycle cannot be controlled linearly. And a description is given of a method of avoiding oscillations of the output voltage Vm and the DC current Ib.
[0277] Such as Figure 17 As shown, another example of the effect of the dead time Dt on the duty cycle D_ON_1 is that there is an error between the calculated duty cycle D_ON_1 and the duty cycle at which the NPN transistor Q1 actually remains on.
[0278] Figure 17 The relationship between on-duty D_ON_1 and actual on-duty is shown.
[0279] exist Figure 17 Herein, the "discharging direction" refers to the direction in which the DC voltage Vb boosted by the boost converter 12 in FIG. 1 is supplied to the capacitor 13 . In the discharge direction, the DC current Ib flows through the...
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