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Motor current detecting IC and motor current detector or motor control apparatus using the same

A current detector and current detection technology, applied in the field of integrated circuits for motor current detection, motor current detectors or motor control devices, can solve the problems of limited miniaturization, inability to reduce costs, and high costs

Active Publication Date: 2014-08-27
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that although a certain degree of miniaturization can be achieved through modularization, further miniaturization is limited and cost reduction cannot be achieved
[0033] For the above reasons, the conventional current detection circuit has a large number of components and requires a large mounting area, so the cost is also high.
In addition, even if the current detection circuit is modularized to achieve miniaturization, the cost will increase further

Method used

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  • Motor current detecting IC and motor current detector or motor control apparatus using the same
  • Motor current detecting IC and motor current detector or motor control apparatus using the same
  • Motor current detecting IC and motor current detector or motor control apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] figure 1 It is a block diagram of a motor control device using an IC (Integrate Circuit: integrated circuit) for motor current detection in Embodiment 1 of the present invention. figure 2 It is a block diagram of the IC for motor current detection of the said embodiment. In addition, in Embodiment 1, especially the main description relates to figure 2 The structure of the differential amplifier circuit 105 and its input terminals T1, T2 and output terminal T7.

[0055] like figure 1 As shown, the frequency conversion circuit for driving a three-phase motor is composed of a total of six switching elements, that is, switching element 131a1 and switching element 131a2, switching element 131b1 and switching element 131b2, switching element 131c1 and switching element 131c2 are respectively connected in series. Finally, with two switching elements as a group, three groups are connected in parallel. At this time, for example, an IGBT is used as a switching element.

...

Embodiment approach 2

[0082] image 3 It is a block diagram of a motor control device using a motor current detection IC in Embodiment 2 of the present invention. Figure 4 It is a block diagram of the IC for motor current detection of the said embodiment.

[0083] That is, Embodiment 2 differs from Embodiment 1 in particular in that a motor current detector connected to a frequency conversion circuit is provided, and the motor current detector combines a motor current detection IC having a plurality of current signal amplifying circuits with a plurality of The current sense is connected with a low resistance.

[0084] Therefore, in Embodiment 2, the main description concerns Figure 4 The structure of the differential amplifier circuit 105 and its input terminals T1, T2, T3, T4, T5, T6 and output terminals T7, T8, T9. At this time, the differential amplifier circuit 105 connected to a pair of input terminals T1, T2 and output terminal T7, the differential amplifier circuit 105 connected to a pa...

Embodiment approach 3

[0094] Below, refer to Figure 1 ~ Figure 4 An IC for motor current detection in Embodiment 3 of the present invention will be described.

[0095] The motor current detection IC according to Embodiment 3 has a configuration in which an amplification factor setting unit capable of adjusting or selecting the amplification factor of the differential amplifier circuit is provided. Other configurations are the same as those of the motor current detecting ICs of Embodiments 1 and 2.

[0096] That is, if figure 2 and Figure 4 As shown, the amplification factor setting part 117 includes: an amplification factor setting device 113, which is provided on the motor current detection IC 101; Fixed terminal.

[0097] In this embodiment, there are two input terminals T13 and T14. Therefore, when the input terminals T13 and T14 are input terminals of digital signals, for example, it is possible to combine digital signals input from the outside to the input terminals T13 and T14. The on...

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PUM

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Abstract

A motor current detecting IC (101) of the invention includes a current signal amplifying circuit having a differential amplifying circuit (105), one pair of input terminals (T1,T2) connected to the differential amplifying circuit, and an output terminal (T7) connected to an output of the differential amplifying circuit; and a power supply terminal which supplies a power supply voltage to the current signal amplifying circuit. The input terminal has a protecting unit (115) for allowing input of a negative voltage. In this manner, a reduction in size and a reduction in cost of the current signal amplifying circuit are realized.

Description

technical field [0001] The present invention relates to an integrated circuit for detecting motor current, and a motor current detector or a motor control device using the integrated circuit for detecting motor current. Background technique [0002] Conventionally, as a control device for a three-phase synchronous motor (hereinafter simply referred to as "motor") such as a three-phase induction motor and a brushless motor, an inverter circuit is generally used. [0003] The control circuit provided in the control device detects the winding current of the motor by the method shown below to control the rotation speed of the motor and the like. [0004] The first method is to directly detect the winding current of the motor using a current detector such as a Hall sensor in a circuit (wiring) connected to the winding of the motor. Also, in general, two circuits are mostly used in three-phase motors. Using this method, the winding current of the motor can be detected with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00H02P21/05H02P23/04H02P23/07H02P25/16H02P27/06
CPCH01L2924/1305H01L2224/48091H01L2924/0002H01L2224/48247G01R19/0092H01L2924/13091H01L2924/13055G01R31/343H01L2924/181H01L2924/00014H01L2924/00H01L2924/00012
Inventor 龟田晃史芝文一森宏一
Owner PANASONIC CORP