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Reversible back-boost chopper circuit, and inverter circuit with the same

A technology of step-up chopping and reverse polarity, applied in the direction of converting irreversible DC power input into AC power output, adjusting electric variables, instruments, etc., can solve the problem of weakening magnetic field, increasing output current, and difficulty in cooling the inverter correctly circuit problems

Inactive Publication Date: 2005-10-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure may lead to an increase in output current; this increase in output current will result in increased conduction losses as well as switching losses
The increase in conduction losses as well as switching losses can make it difficult to properly cool the inverter circuit
In addition, the low output voltage makes field weakening very difficult, and when the alternator is driven as a generator at higher speeds, field weakening is required to control regenerative current

Method used

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  • Reversible back-boost chopper circuit, and inverter circuit with the same
  • Reversible back-boost chopper circuit, and inverter circuit with the same
  • Reversible back-boost chopper circuit, and inverter circuit with the same

Examples

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no. 1 example

[0031] Hereinafter, an inverter circuit of a motor drive according to a first embodiment of the present invention will be described with reference to the drawings.

[0032] The structure of the inverter circuit includes the chopper circuit.

[0033] Such as Figure 1A As shown in , the inverter circuit 30 has a chopper circuit 1 and a first smoothing capacitor C1, which is an example of a first voltage smoothing circuit according to the present invention. A first smoothing capacitor C1 is located at one of the input / output terminals of the chopper circuit 1 . The inverter circuit 30 has a second smoothing capacitor C2, which is an example of a second voltage smoothing circuit according to the present invention, at the other input / output terminal of the chopper circuit 1. middle.

[0034] The chopper circuit 1 has a power-side half-bridge circuit 2, a load-side half-bridge circuit 3, and a reactor 4 such as a choke coil.

[0035] The half-bridge circuit 2 at the power supply...

no. 2 example

[0114] Attach the reference Figure 6 An inverter circuit according to a second embodiment of the present invention will be described. The inverter circuit uses a plurality of chopper circuits 1 shown in FIG. 1 and is operable to drive a three-phase motor / generator. By the way, in Figure 6 , the number of chopper circuits according to the first embodiment is set to be twice or more the number of phases (three) of the three-phase motor. For example, twelve chopper circuits 111 to 122 are provided per phase.

[0115] Only the U-phase inverter circuit 110 is exemplified in order to briefly describe the inverter circuit according to the second embodiment. The U-phase inverter circuit 110 has twelve chopper circuits 111 to 112 each having substantially the same structure as the chopper circuit 1 . The chopper circuits 111 to 122 are connected in parallel with each other.

[0116] Each on-time (or off-time) of each switching element of each chopper circuit 111 to 112 is sequen...

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Abstract

In a reversible buck-boost chopper circuit, a first half-bridge circuit has a first switching element with a high-side main electrode connected to a positive electrode of a DC power source, and a second switching element is connected to the first switching element at a first output terminal. A low-side main electrode of the second switching element is connected to a negative electrode of the DC power source. A second half-bridge circuit has a third switching element with a high-side main electrode connected to a high-side terminal of the load. A fourth switching element of the second half-bridge circuit is connected to the third switching element at a second output terminal. A low-side main electrode of the fourth switching element is connected to a low-side terminal of the load and the negative electrode. A reactor is connected between the first and second output terminals.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2004-106002 filed on March 31, 2004, and the entire content of this application is hereby incorporated by reference. technical field [0003] The invention relates to a reversible buck-boost chopper circuit and an inverter circuit having the same. More specifically, the present invention can be used for drive control of electric traction motors each providing drive torque. Background technique [0004] In dual power type vehicles or fuel cell electric vehicles, it is necessary to increase the supply voltage, ie the desired direct current (DC) battery voltage, to reduce copper loss and / or switching loss. Recently, a voltage of about 300 V has been used as the DC power supply voltage; this voltage is its upper limit in view of actual conditions such as an increase in battery cost. [0005] In a dual power type car or a fuel tank elect...

Claims

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Application Information

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IPC IPC(8): G05F1/40H02M3/00H02M3/155H02M3/158H02M7/48H02M7/757
CPCH02M3/1582H02M7/48H02P27/06B60L15/007Y02T10/64
Inventor 仁野新一
Owner DENSO CORP
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