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Resolver excitation circuit

A technology of rotary transformer and excitation circuit, which is applied in the direction of instruments, electronic commutators, and electric devices, and can solve the problems of increasing the number and increasing the cost

Inactive Publication Date: 2015-09-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, including the LPF in the resolver excitation circuit results in an increase in cost because the number of circuit parts such as resistors and capacitors constituting the LPF increases

Method used

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Embodiment Construction

[0015] Hereinafter, specific embodiments of a resolver excitation circuit according to the present invention will be described with reference to the accompanying drawings.

[0016] figure 1 A configuration diagram of an angle detection device 12 including a resolver excitation circuit 10 according to an embodiment of the present invention is shown. The angle detection device 12 in this embodiment is, for example, a device for detecting the rotation angle of a target object such as a motor embedded in a vehicle. The angle detection device 12 includes a resolver 14 and a resolver exciting circuit 10 for exciting the resolver 14 .

[0017] The resolver 14 is a sensor that is arranged near the rotation shaft of the motor to output a resolver signal (analog signal) depending on the rotation angle of the rotation shaft. The resolver 14 outputs a resolver signal as an electrical signal that changes by an amount of n cycles when the rotary shaft mechanically makes one rotation, that...

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Abstract

A resolver excitation circuit includes a D / A converter configured to generate a sinusoidal excitation signal being supplied to a resolver outputting a resolver signal to detect a rotation angle of a target object with a predetermined sampling frequency; and an amplifier configured to be constituted with an operational amplifier amplifying the excitation signal generated by the D / A converter. The operational amplifier has a gain-frequency characteristic set so that the predetermined sampling frequency is a higher frequency than a cutoff frequency of a gain of the operational amplifier, and the gain of the operational amplifier at the predetermined sampling frequency is lower than 0 dB.

Description

technical field [0001] The disclosure herein relates generally to a resolver field circuit for exciting a resolver. Background technique [0002] Conventionally, a resolver excitation circuit for exciting a resolver is known (for example, see Patent Document 1). The resolver excitation circuit described in Patent Document 1 includes a D / A (Digital-Analog) converter, an LPF (Low Pass Filter), and an amplifier. [0003] The D / A converter converts the digital data obtained by sampling the sinusoidal waveform into an analog signal at a predetermined sampling frequency, and generates a sinusoidal excitation signal to be supplied to the rotation for detecting the rotation angle of the target object transformer. The LPF is a circuit for removing high-frequency components accompanying sampling (quantization) of the D / A converter from the sinusoidal excitation signal output from the D / A converter. The amplifier amplifies the sinusoidal excitation signal from which the high-frequen...

Claims

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Application Information

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IPC IPC(8): G01B7/30G01D5/22
CPCG01B7/30G01D5/12H02P6/16
Inventor 井手晓彦大石真
Owner TOYOTA JIDOSHA KK
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