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Charge and discharge circuit, control method for charge and discharge circuit, control device for charge and discharge circuit, and direct power converter

A technology of charging and discharging circuit and power converter, which is applied in the direction of converting irreversible DC power input into AC power output, high-efficiency power electronic conversion, and output power conversion device, etc., can solve the problem of not setting booster circuit and capacitor, etc.

Active Publication Date: 2018-08-10
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent Document 2 also discloses a direct type power converter, but the above-mentioned boost circuit and capacitor are not provided

Method used

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  • Charge and discharge circuit, control method for charge and discharge circuit, control device for charge and discharge circuit, and direct power converter
  • Charge and discharge circuit, control method for charge and discharge circuit, control device for charge and discharge circuit, and direct power converter
  • Charge and discharge circuit, control method for charge and discharge circuit, control device for charge and discharge circuit, and direct power converter

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Embodiment Construction

[0048] A. The structure of the direct type power conversion device:

[0049] Before specifically describing the characteristic technology of the embodiment, the configuration of a direct power conversion device to which this technology is applied will be described. In addition, the basic operation of this structure itself is already known in Patent Document 1, so details thereof are omitted here.

[0050] Such as figure 1 As shown, the direct power conversion device has a diode rectifier 2 , an LC filter 3 , a charging and discharging circuit 4 and an inverter 5 . DC power supply lines LH, LL function as a DC link between inverter 5 and charge / discharge circuit 4 . A higher potential than that of the DC power supply line LL is applied to the DC power supply line LH.

[0051] The diode rectifier 2 has an input side and an output side to which a single-phase AC voltage Vin is applied from the single-phase AC power supply 1 .

[0052] The diode rectifier 2 performs single-pha...

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Abstract

Even when the resonance of the LC filter is suppressed by using the suppression current, the sampling of the control system for controlling the inverter and the update of the command value are not deteriorated. In the module (10a), the current distribution ratio generator (11) uses the amplitude (Vm) of the single-phase AC voltage (Vin), the amplitude (Im) of the input current, and the command value (Idc*) of the DC current (Idc) , the command value (Vc*) regarding the voltage between both ends (Vc), and the power supply angular velocity (ω) are input. A current distribution ratio generator (11) outputs a current command value (Ib*). A resonance suppression control unit (15) receives a reactor voltage (VL) as an input, and outputs a correction value (k·VL). A subtractor (17) subtracts a correction value (k·VL) from a current command value (Ib*), and supplies it to a chopper control unit (16). A chopper control unit (16) outputs a boost duty ratio (dl) based on the corrected current command value (Ib*-k·VL). The boost duty cycle (dl) is compared with the carrier (C2) in the comparator (14), and the result is output as a control signal (SSI).

Description

technical field [0001] The present invention relates to a charge-discharge circuit included in a direct-type power converter, a control method for the charge-discharge circuit, a control device for the charge-discharge circuit, and the direct-type power converter. Background technique [0002] Patent Documents 1, 3, and 4 disclose direct power converters. The direct type power converters disclosed in these patent documents include a boost circuit and a capacitor supporting a voltage boosted by the boosted voltage. Among the direct current power supplied to the inverter, the electric power from the capacitor and the electric power obtained from the diode rectifier are appropriately processed, thereby increasing the direct current voltage input to the inverter. [0003] Patent Document 2 also discloses a direct type power converter, but does not include the above-mentioned booster circuit and capacitor. On the other hand, an LC filter for suppressing the carrier current of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/155H02M7/48
CPCH02M1/12H02M1/4225H02M5/458H02M1/126H02M7/53871H02M7/5395H02M1/15Y02B70/10H02M1/0025H02M1/0009H02M1/007H02M1/4266H02M1/08
Inventor 山下尚也
Owner DAIKIN IND LTD