AC-DC conversion devices, motor drive control devices, blowers, compressors, and air conditioners
An AC-DC conversion and motor technology, which is applied in the direction of AC motor control, AC power input conversion to DC power output, and irreversible AC power input conversion to DC power output, etc. The effect of suppressing cost increase
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Embodiment approach 1
[0045] figure 1 It is a circuit diagram showing the configuration of the AC / DC conversion device according to the first embodiment. AC-DC converter 100 according to Embodiment 1 is an AC-DC converter that converts AC power supplied from single-phase AC power supply 1 into DC power and supplies it to load 500 . Such as figure 1 As shown, the AC / DC conversion device 100 according to Embodiment 1 includes a booster circuit 3 , a smoothing capacitor 4 , a first voltage detector 5 , a second voltage detector 7 , and a control unit 10 . An example of load 500 is a three-phase motor built in a blower, compressor, or air conditioner.
[0046]The booster circuit 3 includes a reactor 2 , a first branch 31 , and a second branch 32 . The first branch 31 and the second branch 32 are connected in parallel. In the first branch 31 a first upper branch element 311 and a first lower branch element 312 are connected in series. In the second branch 32 , a second upper branch element 321 is c...
Embodiment approach 2
[0086] In Embodiment 1, the branch elements performing the voltage boosting operation are switched every power supply cycle. On the other hand, Embodiment 2 is an embodiment in which the branch elements that perform boosting operations are switched at the carrier cycle. In addition, the carrier period is sometimes referred to as a "second period". The carrier cycle is shorter than the power cycle.
[0087] Next, the operation of the AC / DC conversion device according to Embodiment 2 will be described. In addition, the structure of the AC-DC conversion device of Embodiment 2 is the same as figure 1 same.
[0088] Figure 10 This is a first timing chart used to describe the operation of the drive pulse generator 24 in the second embodiment. Figure 11 This is a second timing chart used to describe the operation of the drive pulse generator 24 in the second embodiment. Figure 12 This is a third timing chart in which the time span used to describe the operation of the drive ...
Embodiment approach 1
[0119] In addition, in the AC / DC conversion device of the second embodiment, the branch elements performing the step-up operation are switched with a carrier cycle shorter than the power supply cycle, so the effect of equalizing the heat generation of the switching elements is greater than that of the first embodiment.
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