power conversion device
A power conversion device and power conversion technology are applied in the direction of high-efficiency power electronic conversion, output power conversion devices, electrical components, etc., which can solve the problems of shortening the on-time of switching elements and deterioration of output voltage accuracy during dead time, and achieve The effect of improving accuracy
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no. 1 Embodiment approach ）
[0022] In the first embodiment, an example of a power conversion device that outputs AC power to a load is shown. figure 1 It is a figure which shows the structure of the power conversion apparatus of 1st Embodiment.
[0023] like figure 1 As shown, the power conversion device 1 of the first embodiment converts the DC power supplied from the DC power supply 2 into AC power, and outputs it to the load 3 . This power conversion device 1 includes a power conversion unit 10 and a PWM control unit 20 . In addition, the DC power supply 2 may be produced by rectifying the input AC power with a power converter.
[0024] The power conversion unit 10 is a single-phase bridge circuit in which a first upper and lower arm connecting switching elements Q1 and Q3 in series and a second upper and lower arm connecting switching elements Q2 and Q4 in series are connected in parallel.
[0025] The switching element Q1 and the switching element Q4 are connected to the positive electrode of the...
no. 2 Embodiment approach ）
[0068] An example of a power conversion device that outputs AC power to a load is described in the first embodiment, and an example of a power conversion device that outputs DC power to a load is described in the second embodiment.
[0069] Figure 4It is a figure which shows the structure of the power conversion apparatus of 2nd Embodiment. In the following description, the same parts as those already described are given the same reference numerals as those already described, and redundant descriptions are omitted.
[0070] like Figure 4 As shown, the power conversion device 1A of the second embodiment includes a power conversion unit 10A instead of the power conversion unit 10 . In addition, the power conversion device 1A includes a PWM control unit 20A instead of the PWM control unit 20 . This power conversion device 1A continuously supplies current in a certain direction to the load 3A. The load 3A is an inductive load, and includes a coil L and a resistance R due to ...
no. 3 Embodiment approach ）
[0084] like image 3 or Image 6 As shown, at the timing of switching the polarity value Sp (here, positive→negative), the control signal is inverted, and the period during which the control signal is output at a high level may be shortened. That is, the on-period of the switching element may be shortened. Therefore, in the third embodiment, an example in which a countermeasure for avoiding the occurrence of this phenomenon is implemented will be described.
[0085] Figure 7 It is a figure which shows an example of the structure of the PWM control part of 3rd Embodiment. in addition, Figure 8 It is a timing chart of the control signal of 3rd Embodiment. In addition, although the example at the time of changing the power conversion device 1A of 2nd Embodiment was demonstrated here as an example, the same change is also possible for the power conversion device 1 of 1st Embodiment.
[0086] like Figure 7 As shown, the PWM control unit 20B of the third embodiment include...
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