power conversion device
A power conversion device and power converter technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve the problem of reducing the number of series series, narrowing the operating range (the range of rotational speed and torque, and reducing the maximum voltage) and other problems, to achieve the effect of small reliability
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Embodiment 1
[0046] As Embodiment 1, a method in which the power conversion device 100 converts the voltage of the power supply 300 into an AC voltage and outputs it to the load 400, and a method in which the operation is continued and the output voltage is increased even when some units fail will be described in detail.
[0047] figure 2 This is the configuration of the power converter unit 101 in Embodiment 1, and a configuration using a single-phase inverter of the H-bridge system is shown as a specific example of the inverter. figure 2 In , only the power converter unit 101 is shown, and other units are omitted. Units 102 to 104 also have the same single-phase inverters. The specific structure of the converter 111 is arbitrary, and various structures are conceivable as described above.
[0048] like figure 2 As shown, the single-phase inverter 121 is an H-bridge circuit including four semiconductor switching elements (11-14). A MOSFET is shown as an example of a semiconductor sw...
Embodiment 2
[0071] As a second embodiment, a case where PWM modulation (pulse width modulation) is applied to the control of the inverter will be described. The structure of the power conversion device 100 is the same as that of the first embodiment.
[0072] 6(A) and 6(B) are output voltage (Vos) waveforms of the power conversion device 100 in the second embodiment. FIG. 6(A) is a waveform during normal operation, and FIG. 6(B) is a waveform when one unit fails. Similar to Embodiment 1, FIG. 6(A) assumes Vdc during normal operation as V0, and FIG. 6(B) increases Vdc to V1=(4 / 3)×V0 when a failure occurs.
[0073] The PWM modulation will be described by taking the normal operation of FIG. 6(A), that is, the case of Vdc=V0 as an example. As described in Embodiment 1, the inverter of each unit can output three types of voltages, +V0, 0, and -V0. When using PWM modulation, the inverter of each unit outputs +V0 and 0 alternately, or outputs -V0 and 0 alternately. Therefore, as shown in FIG...
Embodiment 3
[0084] In the third embodiment, the power supply 300 is assumed to be a DC power supply, and the power supply 300 and the load 400 are electrically isolated, and a specific structure of the converter is shown. In this case, an isolated DC-DC converter is required as a converter.
[0085] Figure 8 This is the configuration of the power conversion device 100 in a case where a resonance type converter is used as a specific example of an isolation type DC-DC converter. inverter with figure 2 A single-phase inverter using the H-bridge method is also used. Figure 8 In , only the unit 101 is shown as the power converter unit, and other units are omitted. Units 102 to 104 also include similar resonant converters.
[0086] like Figure 8 As shown, the converter 111 is a resonant converter, including: a single-phase inverter with 4 (21-24) MOSFETs in the form of an H bridge; a resonant circuit with a coil 25, a capacitor 26, and a transformer 27; with 4 A rectifier circuit of (...
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