JPS6013482B2 - Function control method of power controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the case of function dimming of a dimmer or effective value control of a thyristor control type power controller, the present invention provides a method for controlling the power controller's power by using a single unit even when the power controller receives three-phase AC power. The present invention relates to a function control method for a power controller, in which the output power of the power controller can be functionally controlled by a function conversion device.

Conventionally, when controlling the effective value of a functional dimming device or a thyristor control type power controller of a steel light device, the method shown in Fig. 1 or 2 is used.
A function control method as shown in the figure is used.

That is, in the method shown in FIG. 1, a voltage or current supplied from a power controller 1 to an AC load 2 such as a dimmer is detected by a detection circuit 3, and this detection signal is transmitted by a function conversion circuit 4. The comparison amplifier 5 compares and amplifies the reference signal from the signal input terminal 6 with the function signal, and then converts it into a predetermined function signal such as an effective value. This function controls the output power of 1. Note that 8 is an AC power source connected to the power controller 1. The method shown in FIG. 2 also uses the reference signal input terminal 9.
The reference signal from the comparator 11 and the function signal from the function signal input terminal 10 are compared by the comparator 11.
Apply the signal to the power controller 1 via the gate circuit 7,
The output power of the power controller 1 is controlled by a function, and the function signal is, for example, a sine wave shown in FIG.
As shown in the figure, the waveform has a predetermined functional relationship. By the way, a plurality of power controllers 1 are normally operated in parallel, but in the method shown in FIG. A feedback loop must be provided,
Therefore, a large number of function conversion circuits 4 are required, which is uneconomical, and mutual adjustment of each function conversion circuit 4 is required, which is extremely difficult. Furthermore, in the method shown in FIG. 2, since the function signal is applied to the gate circuit 7 for each power controller 1, when the AC power supply 8 has three phases,
If each phase of a three-phase AC is controlled by one function signal, only the phase that is in phase with the function signal can be controlled, and phases that are not in phase cannot be controlled, so three function signals are generated for one power controller 1. A circuit is required, and it is difficult to mutually adjust the function signals for each phase. In addition, the power controller 1
Since a feedback system is not configured to detect and feed back the output power, it is difficult to compensate for load fluctuations and prevent overcurrent. This invention takes into account the conventional problems,
It is possible to perform function control of a power controller using one function conversion device for one power controller regardless of the phase of the AC power supply. This will be explained in detail with reference to Figure 4 and the following drawings.

In FIG. 4, the same symbols as in FIGS. 1 and 2 indicate the same things, and 12 and 13 are control terminals and reference signal inputs into which a power control signal and a reference signal that changes at a constant cycle are respectively input. 14 is a comparator whose both input ends are respectively connected to the control terminal 12 and the reference signal input terminal 13; 15 is the rising edge of the output signal of the comparator 14; from this a pulse outputting a single pulse with a predetermined pulse width; 16 is a function signal input terminal into which a function signal having a predetermined functional relationship with respect to the reference signal is input; 17 is a regular switch connected to the function signal input terminal 16; It is turned on by the output pulse of

18 is a capacitor connected between switch 17 and ground; 19 is a sample-and-hold circuit consisting of switch 17 and capacitor 8; 20 is a function conversion device consisting of comparator 14, pulse generation circuit 15, and sample-and-hold circuit 19; Terminal 21 is connected to comparator amplifier 5, which together with detection circuit 3 and gate circuit 7 constitutes a feedback system of power controller 1.

Next, the operation of the embodiment will be explained with reference to FIGS. 5 and 6.

First, to explain the reference signal and the function signal with reference to FIG. 5, for example, suppose that a sawtooth wave shown by curve A is obtained by a reference signal generator (not shown) as a reference signal that continuously changes at a constant period. , Now, if the reference signal and the function signal are respectively represented by voltages V, , V2, then
A function voltage V2 with respect to a reference voltage V is determined in advance.

If the function voltage V2 with respect to the reference voltage V is determined to have a functional relationship like the curve shown by B, then the function voltage V2 will have a waveform like the curve shown by C.
Next, the operation of the function conversion device 20 will be explained.

At the time (to) shown in FIG. 6, when a function signal, a reference signal, and a power control signal as shown in FIG. When the reference signal and the power control signal match, as shown in FIG. At the rising edge of , a single pulse with a predetermined pulse width is output from the pulse generating circuit 15, as shown in Figure e.At this time, the smaller the pulse width of the single pulse, the better the accuracy.And, The switch 17 is turned on by the output pulse of the pulse generator 15. In other words, the switch 17 is turned on only when the output signal of the pulse generator 15 is at a high level. As shown in figure f, the function signal is passed through the switch 17 to the capacitor 1.
It is charged to 8. At this time, the switch 17 is turned off when the pulse from the pulse generator 15 disappears, but since the impedance of the comparator amplifier 15 is very large, the capacitor 18 is not discharged. That is, when the function signal matches the reference signal and the power control signal, it is sampled and held in the sample-and-hold circuit 19, and furthermore, at (t2), as shown in FIG. As shown in figure d, the output signal of the comparator 14 also becomes zero;
As shown in the figure, a signal sampled and held by a sample and hold circuit 19 is outputted from an output terminal 21 of the function conversion device 20. Then, at (ra) time, the reference signal and the power control signal match again, and as shown in Figure e, a single pulse is output from the pulse generation circuit 15 and the switch 17 is turned on, but at this time, As shown in Figure C, since the power control signal has not changed since time (t.), the output signal of the function conversion device 20 changes according to the amount of discharge of the capacitor 18, as shown in Figure F. The waveform has a slight step, and if the coso capacitor 18 were only charged without discharging, the potential would be the same. Then, at time (t), if the power control signal is changed and increased as shown in figure c, at time (t5), the reference signal and the power control signal match, and as shown in figure e, , the switch 17 is turned on and the function signal is sampled and held. At this time, as is clear from Figure A, the function signal sampled and held is larger than at the above-mentioned times (t,) and (t3), and as shown in Figure F, the function signal sampled and held is The output signal of the function conversion device 20 also changes, and furthermore, when the power control signal is the same as at time (t5) and coincides with the reference signal at time (k), the function conversion is performed in the same manner as at time (ra) described above. The output signal of device 20 changes only by the amount of discharge of capacitor 18. That is, in the function conversion device 201, the power control signal is converted into a function conversion signal corresponding to the function signal. Then, the function conversion signal from the function conversion device 20 is transmitted to the comparator amplifier 5.
The comparison amplifier 5 compares the detection signal obtained by detecting the output power of the power controller 1 by the detection circuit 3 with the reference signal using the function conversion signal as a reference, and the comparison signal output from the comparison amplifier 5 is It is applied to the power controller 1 via the gate circuit 7, and the output power of the controller 1 is functionally controlled.

In the above embodiment, the reference signal is a sawtooth wave, but it may be a staircase wave or a sine wave that changes at a constant period.

As described above, according to the function control method for a power controller of the present invention, a reference signal that changes at a constant cycle and a power control signal are compared, and when the power control signal and the reference signal match, the reference signal is , sample and hold a function signal that has a functional relationship to convert the power control signal into a function conversion signal,
By comparing the function conversion signal and the detection signal of the output power of the power controller, and controlling the output power of the power controller using the comparison signal, the function conversion signal becomes a linear continuous waveform. Since the power control signal can be converted into any function conversion signal by varying the power control signal, the power controller can be functionally controlled regardless of the phase of the power supply of the power controller.For example, even if the power supply of the power controller is 3-phase AC, It can be controlled by one function conversion device.

Furthermore, the feedback system of a conventional power controller can be used as is, and load fluctuation compensation and overcurrent can be prevented. Brief explanation of the drawings Figures 1 and 2 are block diagrams showing the function control method of the subordinate power controller, Figure 3 is an explanatory diagram of the function signal in Figure 2, and Figure 4 and the following figures are block diagrams showing the function control method of the subordinate power controller. 4 shows a block diagram, FIG. 5 is an explanatory diagram showing the relationship between the reference voltage and the function voltage, and FIG. 6 shows the signals of each part,
Figure a is a waveform diagram of the function signal, diagram b is a waveform diagram of the reference signal, diagram c is a waveform diagram of the power control signal, diagram d is a waveform diagram of the comparator output signal, diagram e is a pulse diagram. The waveform diagram of the output signal of the generation circuit is a waveform diagram of the function conversion signal.

1...Power controller.

Figure 1 Figure 2 Figure 3 Diagram Figure 5 Figure 6

Claims (1)

[Claims] 1 Compare a reference signal that changes at a constant period with a power control signal, and when the power control signal and the reference signal match, sample and hold a function signal that has a functional relationship with the reference signal. Converting the power control signal into a function conversion signal, comparing the function conversion signal with a detection signal of output power of the power controller, and functionally controlling the output power of the power controller using the compared comparison signal. A function control method for a power controller, characterized in that: