JP2754900B2 - Phase matching pulse generation circuit - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase-matching loss generating circuit, and more particularly to a phase-matching pulse generation circuit that indicates a match between phase data indicating the phase of a phase pulse to be phase-controlled and phase setting data (target data). It relates to a generating circuit.

2. Description of the Related Art It is necessary to keep the antenna of a spin satellite facing the earth at all times, and for this purpose, the angle of the antenna is controlled based on the position of the sun. In this case, a phase clock synchronized with the spin of the spin satellite is used, and the phase of this phase clock is converted into phase data to generate target data from the position of the sun. Then, the phase data is compared with the target data, and the antenna driving motor is controlled according to the comparison result.

FIG. 2 is a schematic block diagram of a phase coincidence pulse generation circuit used for this type of phase control. The phase clock 10 is input to the phase data converter 11 and is converted into phase data (0 to 360 degrees) 1 indicating the phase of the phase clock 10.

The comparator 12 compares the phase data 1 with the target data 2 which is a set value, and generates and outputs a coincidence detection pulse 8 when they coincide with each other.

FIG. 3 is a time chart showing the relationship between phase data 1 and target data 2 in FIG. The phase data 1 is phase information having a level corresponding to the phase of a phase clock pulse synchronized with the rotation of a rotator such as a satellite, and is between 0 degrees and 360 degrees of the rotator (one cycle of rotation of the rotator). , A sawtooth wave whose level gradually increases.
Reference numeral 2 denotes setting information indicating a target rotation phase of the rotating body as a level, that is, target data. Here, when the target data 2 is changed before the phase data 1 and the phase angle match, and particularly when the target data 2 is changed to a value smaller than the current phase data 1, the match is made. If the detection pulse 8 is not output and the phenomenon as shown in FIG. 3 continues, the sequence of the coincidence detection pulse 8 is interrupted.

As a result, when the rotation of the antenna is controlled with the coincidence detection pulse 8 as a target, there is a disadvantage that the target is lost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a phase coincidence pulse generation circuit that can reliably generate a coincidence detection pulse regardless of the setting change of target data in any state.

Configuration of the invention A phase matching pulse generation circuit according to the present invention comprises: phase information having a level corresponding to the phase of a phase clock pulse synchronized with the rotation of a rotating body; and a phase setting level for setting the phase of the phase clock pulse. A comparing unit that compares the phase setting information with the phase setting information to generate a large level detection signal when the level of the phase information is higher than the phase setting level, wherein the level of the phase information and the phase setting level are Coincidence detection means for outputting a coincidence pulse when coincidence occurs, pseudo pulse generation means for generating a pseudo pulse when the coincidence pulse is not generated at the generation timing of the large level detection signal, And a pulse synthesizing means for synthesizing and outputting the pulse.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention. The magnitude comparator 3 performs magnitude comparison between the phase data 1 and the target data 2, and outputs a detection signal 14 when the phase data 1 is larger.

The edge detector 4 detects the rising edge of the detection signal 14 from the magnitude comparator 3 and generates an edge pulse. The equality comparator 7 calculates the phase data 1 and the target data 2
And outputs a coincidence pulse 13 between the same value.

The pseudo pulse generation unit 5 generates a pseudo pulse when the coincidence pulse 13 is not generated by the equivalent comparator 7 when the edge detector 4 generates an edge pulse. The pulse synthesizer 6 includes the coincidence pulse 13 from the equivalent comparator 7 and the pseudo pulse generator 5.
, And outputs the result by performing a logical OR operation on the pseudo pulse from the input signal and the coincidence detection pulse train 8.

FIGS. 4 and 5 are diagrams showing waveform examples of the output 14 of the magnitude comparator 3 and the output 13 of the equivalent comparator 7, respectively. As shown in FIG. 4, when the values of the phase data 1 and the target data 2 match, the output 13 of the equivalent comparator 7 becomes a high-level matching pulse during that time. Then, when the phase data 1 becomes larger, the output 14 of the magnitude comparator 3 becomes high level.

At this time, the rising edge of the magnitude comparator 3 is detected by the edge detector and transmitted to the pseudo pulse generator 5. The pseudo pulse generator 5 monitors whether or not the coincidence pulse 13 is generated during one cycle of the phase data in which the edge is detected. If the coincidence pulse 13 does not exist, the pseudo pulse is generated. Does not occur.

That is, as shown in FIG. 4, if both the output 13 of the equivalent comparator 7 and the rising edge of the output 14 of the magnitude comparator 3 exist within the same period, no pseudo pulse is generated.

However, as shown in FIG. 5, the target data 2 is changed before the target data 2 matches the phase data 1 and the target data 2 is changed.
Is smaller than the phase data 1, the output of the magnitude comparator 3
Since only 14 rises, a pseudo pulse is output.

The pulse synthesizing unit 6 calculates the logical sum of the pseudo pulse and the coincidence pulse 13 and shapes the waveform to derive the coincidence detection pulse train 8. Therefore, it is possible to generate a coincidence detection pulse for each cycle of the phase data.

Effect of the Invention As described above, according to the present invention, not only the phase data and the target data are matched, but also a magnitude comparison between the two data is performed, and a coincidence pulse is generated when the phase data is larger than the target data. If not, a pseudo-pulse is generated, so that the phase-matching pulse can be output continuously and periodically, preventing the phenomenon that the target value is lost and the position of the antenna is not determined due to loss of synchronization. This has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a conventional phase matching pulse generation circuit, FIG. 3 is an operation time chart of the block of FIG. 2, and FIGS. FIG. 3 is a diagram showing, in each case, a waveform of an output of an equivalent comparator and an output of a magnitude comparator in the block of FIG. Description of Signs of Main Parts 1... Phase Data 2... Target Data 3... Large and Small Comparator 4... Edge Detector 5... Pseudo Pulse Generator 6. Match detection pulse

Claims (1)

(57) [Claims] A phase information having a level corresponding to the phase of a phase clock pulse synchronized with the rotation of a rotating body is compared with phase setting information having a phase setting level for setting the phase of the phase clock pulse. Comparing means for generating a large level detection signal when the level of the phase information is higher than the phase setting level, and outputting a coincidence pulse when the level of the phase information matches the phase setting level Coincidence detection means, and a pseudo pulse generation means for generating a pseudo pulse when the coincidence pulse is not generated at the generation timing of the large level detection signal,
A phase coincidence pulse generating circuit comprising pulse synthesizing means for synthesizing the pseudo pulse and the coincidence pulse and outputting the synthesized pulse.