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Motor Controls and Air Conditioners

A technology for control devices and motors, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc. It can solve the obstacles to the realization of high-efficiency operation, the increase of switching loss of switching elements, and the lack of consideration of the AC output voltage ratio. Modulation rate and other issues, to achieve the effect of efficient operation

Active Publication Date: 2016-04-27
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the case of high ambient temperature even under low load, it may hinder the realization of high-efficiency operation
[0007] In addition, in the technique of Patent Document 1, the modulation factor indicating the ratio of the amplitude value of the AC output voltage to the amplitude value of the DC input voltage of the three-phase inverter circuit performing PWM control is not considered.
Therefore, when the modulation rate is assumed to increase, the switching loss of the switching element increases, which may hinder the realization of efficient operation.

Method used

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no. 1 approach

[0043] (Overall structure of the motor control device according to the first embodiment of the present invention)

[0044] First, refer to figure 1 The overall configuration of the motor control device according to the first embodiment of the present invention will be described. figure 1 It is a block diagram showing the overall configuration of a motor control device 11A according to the first embodiment of the present invention.

[0045] In the motor control device 11A of the first embodiment, a three-phase synchronous motor 15 (corresponding to the "three-phase motor" of the present invention is used. Specifically, for example, a DC brushless motor is used.) using a three-phase inverter circuit 17A. The case of drive control is explained as an example.

[0046] The motor control device 11A according to the first embodiment switches between the three phases according to the junction temperature Tj of the first to sixth switching elements SIup, SMun, SIvp, SMvn, SIwp, and S...

no. 2 approach

[0117] (Switching control of modulation method based on modulation rate)

[0118] In the first embodiment, the junction temperature Tj and the circuit current Io of the switching elements in the three-phase inverter circuit 17A were used as technical elements for switching the modulation method, but in the second embodiment, the modulation factor This point is different from the first embodiment.

[0119] The switching losses of the first to sixth switching elements SIup to SMwn of the three-phase inverter circuit 17A vary not only with the modulation method but also with the modulation rate. Specifically, when the PWM-controlled switching operation is performed when the circuit current Io of the three-phase inverter circuit 17A is large, the switching losses of the first to sixth switching elements SIup to SMwn increase. Also, when the PWM-controlled switching operation is performed when the circuit current Io is small, the switching losses of the first to sixth switching el...

no. 3 approach

[0161] Such as figure 1 or Figure 12 As shown, in the first and second embodiments, the three-phase inverter circuit 17A is driven by the DC power supply 13 , but the DC power supply 13 may be replaced by an inverter circuit capable of controlling the DC output voltage.

[0162] Figure 18 It is a block diagram showing the configuration of a DC power supply for a three-phase inverter circuit according to a third embodiment of the present invention, that is, a converter circuit 100A that includes a reactor on the AC side and controls a DC output voltage.

[0163] Such as Figure 18 As shown, the main circuit of the conversion circuit 100A includes a reactor 103 connected in series with the commercial power supply 101, a diode bridge 105 for rectifying the AC voltage of the commercial power supply 101 into a DC voltage, and the DC voltage rectified by the diode bridge 105. A smoothing capacitor 107 for smoothing the ripple component, and a bidirectional switch 109 for connec...

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Abstract

The present invention provides a motor control device capable of reliably realizing high-efficiency operation. When a three-phase inverter circuit (17A) with an IGBT on the upper arm and a MOSFET on the lower arm performs PWM control, if the modulation rate of the three-phase inverter circuit (17A) is lower than a predetermined threshold value, two-phase inverters on the lower arm are performed. Modulation (lower biphasic modulation), if the modulation rate is higher than the specified threshold, perform biphasic modulation of the upper arm (upper biphasic modulation), if the modulation rate is at an intermediate level, perform biphasic modulation of the upper and lower arms (Up and down two-phase modulation). Thus, by performing lower two-phase modulation when the modulation rate is low, more current can flow through the MOSFET of the lower arm, thereby reducing conduction loss and improving the operating efficiency of the three-phase inverter circuit (17A). In addition, by performing upper two-phase modulation when the modulation ratio is higher than a predetermined threshold value, it is possible to suppress an increase in conduction loss and suppress a decrease in operating efficiency of the three-phase inverter circuit (17A).

Description

technical field [0001] The present invention relates to a motor control device and an air conditioner for driving and controlling a three-phase synchronous motor using a three-phase inverter circuit for converting DC power into three-phase AC power. Background technique [0002] In equipment equipped with a motor as a load, there is a strong demand for resource saving and energy saving due to recent global environmental protection requirements. In order to meet such requirements, a three-phase inverter circuit that converts DC power into three-phase AC power is generally used to control the drive of a three-phase synchronous motor. [0003] Patent Document 1 discloses a three-phase inverter device including a switching circuit having a series circuit of three-phase IGBTs and MOSFETs as switching elements, and connecting the IGBTs and MOSFETs in these series circuits to each other. The connection point is connected to the load; and the control unit performs PWM control on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02M7/06H02M7/48H02P6/06H02P6/28H02P21/22H02P27/06H02P27/08
CPCY02B70/10H02P27/06
Inventor 月井浩二船山裕治田村正博田村建司右之子知惠
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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