JP2905879B2 - Digital / Synchro Quadrant Switching Device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Field of the Invention The present invention relates to a digital / synchro-quadrant switching device, and more particularly, to a digital / synchro-quadrant switching device using a one-phase reference signal and a D / A converter having a phase inversion function. The present invention relates to a novel improvement for directly inputting an angle signal to a D / A converter and outputting sinθ and cosθ analog angle signals.

b. Prior Art There have been various types of digital / synchro-quadrant switching devices of this type which have been used in the past. Among them, the configuration manufactured by the present applicant in-house is shown in FIGS. explain.

In the figure, reference numeral 1 denotes a first quadrant switching circuit to which AC two-phase reference signals S ₁ and S ₂ are input. The first quadrant switching circuit 1 includes a first gate G 1 and a second gate G 1.
It is composed of a gate G2.

The first reference signal output V from the first gate G1
_RS is input to the sin D / A converter 2 are input as the second analog angle output V _S to the third gate G3 of the second quadrant switching unit 3.

The third reference signal output V _RC from the second gate G2 is inputted to the cos D / A conversion section 4, a fourth analog angle output V _C, the fourth gate G4 of the second quadrant switching unit 3 Has been entered.

The above-described digital / analog conversion operation is as shown in FIG. 6. First, when a digital angle signal (θ) from 0 ° to 360 ° is input, as shown in the first stage, By switching the gates G1 and G2 in the state shown in the figure, the first reference signal output V _RS
And the third reference signal output _VRC is a sin D / A converter 2
And the cos D / A conversion unit 4, as shown in the second stage,
The analog sin θ and analog cos θ signals of θ = 0 to 90 ° are composed of inversion parts,..., and normal rotation parts,. analog sinθ signal V _S0 and analog cosθ signal V _C0 until ° is obtained.

c. Problems to be Solved by the Invention Since the conventional digital / synchro-quadrant switching device is configured as described above, the following problems exist.

That is, since the first and second quadrant switching units are provided before and after the sin D / A conversion unit and the cos D / A conversion unit, a special decoder for operating each of these quadrant switching units is provided. A circuit was required, and the circuit configuration was extremely complicated.

Further, a reference signal cannot be directly input to each D / A conversion unit, so that the circuit configuration cannot be complicated.

Furthermore, since each quadrant switching unit is not concentrated in one place, complication cannot be avoided when configuring the device.

The present invention has been made to solve the above problems, and in particular, by using a single-phase reference signal and a D / A converter with a phase inversion function, the reference signal is directly D / A converted. It is an object of the present invention to provide a digital / synchro-quadrant switching device which inputs to a section and outputs analog angle signals of sin θ and cos θ.

d. Means for Solving the Problems The digital / synchro quadrant switching device according to the present invention comprises:
An analog angle signal obtained by inputting a one-phase reference signal and modulating a digital angle signal (θ) with the reference
a sin D / A converter and a cos D / A converter for converting sin θ (0 ° to 90 °) and cos θ (0 ° to 90 °);
A first phase inversion amplifier connected to the A conversion unit, and the cos D
A second phase inverting amplifier connected to the A / A converter;
A quadrature switching section connected to the D / A conversion section, the cos D / A conversion section, the first phase inversion amplification section and the second phase inversion amplification section, and a first amplification section and a second amplification section connected to the quadrant switching section. This is a configuration including an amplification unit.

e. Function In the digital / synchro-quadrant switching apparatus according to the present invention, since each D / A conversion section is provided with a phase inversion amplification section as a phase inversion function section, a reference signal input to each D / A conversion section is provided. Can be directly input without inverting for each quadrant as in the past, and each D / A converter is converted and output in a state of normal rotation or inversion for each angle signal, and the analog of sinθ and cosθ is output. An angle signal can be obtained.

f. Embodiment Hereinafter, a preferred embodiment of a digital / synchro quadrant switching device according to the present invention will be described in detail with reference to the drawings.

The same or equivalent parts as those in the conventional example will be described using the same reference numerals.

FIGS. 1 to 3 show a digital / synchro-quadrant switching apparatus according to the present invention. FIG. 1 is a block diagram showing the overall configuration, and FIG. 2 is a detailed view of the quadrant switching section of FIG. FIG. 3 is a switching configuration diagram showing switching timing of the quadrant switching unit.

In the figure, reference numeral 10 denotes a one-phase reference signal input to a sin D / A conversion unit 2 and a cos D / A conversion unit 4 via a reference transformer 11 and a noise filter 12. The / A converters 2 and 4 are connected to a first phase inversion amplifier 2A and a second phase inversion amplifier 4A having a phase inversion function of -1 amplifier.

Each of the D / A converters 2, 4 and each phase inverting amplifier 4A are connected to a quadrant switching unit 3, and this quadrant switching unit 3
The amplifier 13 and the second amplifier 14 are connected.

The sin θ of the analog signal obtained from each of the amplifiers 13 and 14
The signal V _S0 and the cos θ signal V _C0 are output via the Scott transformer 15 on the output side.

The quadrant switching unit 3, the second is configured as shown in FIG, first group and the fifth to eighth switching point S ₅ to S ₈ consisting of first to fourth switching point S ₁ to S ₄ And a second group consisting of

The analog angle signal s of 0 to 90 ° of the sin D / A converter 2
inθ output 2a is inputted to the first switching point S ₁ and the sixth switching point S _6, from the first phase inversion amplifying section 2A ▲ ▼ output 2b
Is input to the third switching point S ₃ and the eighth switch point S _8.

The analog angle signal cosθ output 4a of 0 ° to 90 ° of the cos D / A conversion section 4, the fifth input to the switching point S ₅ and the second switching point S _2, from the second phase inverting amplifying portion 4A ▲ ▼ Output 4b
Is input to the fourth switching point S ₄ and the seventh switch point S _7.

The digital / synchro quadrant switching device according to the present invention
It is configured as described above, and its operation will be described below.

First, the one-phase reference signal 10 directly input to each of the D / A conversion units 2 and 4 is 0 ° to 90 ° in each of the D / A conversion units 2 and 4.
D / A conversion by digital angle signal of 0 ° to 90 °
Output 2a and cos θ output consisting of analog angle signals
4a is input to the quadrant switching unit 3, and at the same time, the 出力 output 2b and the ▼ output 4b whose phases have been inverted by the phase inversion amplifying units 2A and 4A are also input.

In the above state, for example, by switching each of the switching points S _{1 to} S ₈ of the quadrant switching unit 3 at the switching timing shown in FIG. 3, the waveforms shown in the second and third steps of FIG. Is obtained from the first amplifying unit 13 and the sin θ signal V
_S0 and the cos θ signal _VC0 are obtained from the second amplifying unit 14, respectively.

g. Effects of the Invention The digital / synchro quadrant switching device according to the present invention
With the above configuration, the following effects can be obtained.

That is, since each D / A conversion unit is provided with a phase inversion amplification unit as a phase inversion function unit, the reference signal input to each D / A conversion unit is inverted for each quadrant as in the conventional case. Therefore, the input can be made directly, and the quadrant switching unit can be concentrated on the subsequent stage of the D / A conversion unit, thereby simplifying the circuit configuration.

Further, since the quadrant switching unit is omitted, a special decoder circuit is not required unlike the related art, and the circuit configuration of the device can be simplified.

[Brief description of the drawings]

FIGS. 1 to 3 show a digital / synchro-quadrant switching apparatus according to the present invention. FIG. 1 is a block diagram showing the overall configuration, and FIG. 2 is a detailed view of the quadrant switching section of FIG. 3 is a block diagram showing the switching timing of the quadrant switching unit, FIGS. 4 to 6 show the conventional apparatus, FIG. 4 is a block diagram, and FIG. 5 is a quadrant switching. FIG. 6 is a block diagram showing the parts in detail, and FIG. 6 is a waveform diagram. 2 is a sin D / A converter, 2A is a first phase inverting amplifier, 3 is a quadrant switching unit, 4 is a cos D / A converter, 4A is a second phase inverting amplifier, 10 is a reference signal, and 13 is a 1 amplifying unit, 14 second
Amplifier, θ: Digital angle signal from 0 ° to 90 ° (45 °
Bits), θ ′: digital angle signal of 180 ° and 90 ° bits.

Claims (1)

(57) [Claims] 1. A one-phase reference signal (10) is input,
An analog angle signal sinθ (0 to 90 °) obtained by modulating a digital angle signal (θ) with a reference and cosθ (0 to 90)
°) sin D / A conversion unit (2) and cos D / A
A converter (4); a first phase inverting amplifier (2A) connected to the sin D / A converter (2); and a second phase inverter connected to the cos D / A converter (4). Amplifying section (4A)
a quadrant switching section (3) connected to a sin D / A conversion section (2), a cos D / A conversion section (4), a first phase inversion amplification section (2A) and a second phase inversion amplification section (4A); A digital / synchro-quadrant switching device, comprising: a first amplifying unit (13) and a second amplifying unit (14) connected to the quadrant switching unit (3).