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Inverter control system

A control system and inverter technology, applied in control systems, vector control systems, motor control, etc., can solve problems such as difficult installation of inverters, and achieve the effects of cost and loss reduction, low calculation load and size

Inactive Publication Date: 2013-09-11
MEIDENSHA ELECTRIC MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, in the case where the inverter is used in a very limited installation space such as vehicle installation, Figure 8 The shown pseudo-current source inverter makes the disadvantage of large size more prominent, so that it is difficult to install the inverter

Method used

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Examples

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no. 1 example

[0033] will now refer to Figures 1 to 4 The inverter control system in the first embodiment according to the present invention will be described. The inverter control system in the first embodiment includes a main circuit 1C and a current control controller 3a.

[0034] Such as figure 1 As shown, the main circuit 1C in the first embodiment is constructed in the same manner as a general voltage source PWM (Pulse Width Modulation) inverter, and includes an inverter INV having a three-phase six-element circuit. In this embodiment, the controlled object (ie, the variable mainly used for control) is the current input to the inverter INV. A direct current (input current of the inverter) between the smoothing capacitor C and the switching elements Sw1 to Sw6 (ie, between the smoothing capacitor C and the inverter INV) is detected or acquired by a current sensor CT or the like. As the current sensor CT, any component that can detect or acquire a current value can be used. For ex...

no. 2 example

[0054] Figure 5 is a block diagram showing the speed control controller of the inverter control system in the second embodiment according to the present invention. Components constructed in the same manner as in the first embodiment are given the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

[0055] The structure of the main circuit in the second embodiment is the same as that of the first embodiment. The inverter control system in the second embodiment includes a speed control controller 3b instead of the current control controller 3a of the first embodiment. Furthermore, the input command in the second embodiment is a speed command value.

[0056] In the second embodiment, the 120-degree conduction patterns S1 ′ to S6 ′ output from the sensorless circuit 10 are converted into speed detection values ​​by the speed detector 11 .

[0057] Next, the subtraction section 12 calculates a speed difference (deviation)...

no. 3 example

[0060] Figure 6 is a block diagram showing an electric power control controller of an inverter control system in a third embodiment according to the present invention. Components constructed in the same manner as in the first embodiment are given the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

[0061] The structure of the main circuit in the third embodiment is the same as that of the first embodiment. The inverter control system in the third embodiment includes an electric power control controller 3c instead of the current control controller 3a of the first embodiment. Furthermore, the input command in the third embodiment is an electric power command value.

[0062] In the third embodiment, a DC voltage value (the voltage between both ends of the smoothing capacitor C, ie, the input voltage to the inverter) is detected. The electric power detector 14 multiplies this voltage detection value by the DC compone...

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Abstract

Provided is an inverter control system that requires low computational load and achieves reduction in size, cost, and loss. An LPF extracts a DC component of a current detection value of an inverter input current, a subtraction unit (4) calculates a difference between a current command value and the DC component of the current detection value, and a current control unit (5) generates from the current difference two-phase PWM signals (Sa, Sb), which are complementary to each other. Further, an integration circuit (7) integrates inverter output terminal voltages (Vu, Vv, Vw) to convert the inverter output terminal voltages (Vu, Vv, Vw) into magnetic flux information (Phiu, Phiv, Phiw), and a logic conversion unit (8) performs logic conversion on the magnetic flux information (Phiu, Phiv, Phiw) to output 120 DEG electricity feeding patterns (S1'-S6'). Then, a logic circuit unit (9) synthesizes logically the PWM signals (Sa, Sb) and the 120 DEG electricity feeding patterns (S1'-S6') to output gate signals (S1-S6).

Description

technical field [0001] The invention relates to a sensorless control and control system for a 120-degree conduction type PWM inverter. Background technique [0002] In general, a voltage source PWM method is used as inverter control for driving a PM motor. In many cases, vector control is applied to current control of the motor in order to control the current waveform into a sinusoidal wave, thereby suppressing harmonics that lead to enabling smooth control of the PM motor. [0003] Furthermore, in many cases, sensorless methods are used to detect the pole position of PM motors. In general, in this sensorless method, the terminal voltage of the motor is collected into the CPU through analog-to-digital conversion or the like in order to detect the magnetic pole position. [0004] Motor current control and sensorless methods require a high computational load on the CPU, therefore, the computational period (cycle) needs to be sufficiently high relative to the rotational cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/06H02P6/16H02P6/08H02P6/182
CPCH02M7/53875H02P27/08H02P2201/07H02P2205/01H02P6/182H02P23/0086H02P21/0085
Inventor 山口崇掛林徹
Owner MEIDENSHA ELECTRIC MFG CO LTD
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