JPS5934722A - Duty controller - Google Patents

Abstract

PURPOSE:To increase the service life of a load controller and to suppress the flicker, by switching the duty ratio of a duty controller only with the fall timing of a pulse generated from a pulse generator. CONSTITUTION:An AC power supply AC is applied to a pulse generator 2 after the half-wave rectification carried out by a half-wave rectifying circuit 1. A capacitor C2 of the generator 2 repeats charging and discharging with the upper/ lower limit voltage decided by resistances R4, R5 and R7. Thus a pulse VT is generated. A flip-flop IC4 of a switch 6 supplies a waveform obtained by differentiating the pulse VT to a clock input T and therefore fetches the output VD of a signal generator 4 only in the fall of the pulse VT to deliver it to an output Q. As a result, the output VO of a timer 3 is turned on and off in a prescribed working time in spite of the variation of the output of the generator 4. Then a load l is turned on and off by a relay of a load controller 5. Thus the ON/OFF frequencies are reduced to increase the lifetime of the controller 5, and at the same time the flicker is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the removal of chattering during switchover in the industrial field of application.

Configuration of the conventional example and its problems As shown in Fig. 1, the conventional data control device includes a half-wave rectifier circuit 1 connected to an AC power supply, a capacitor C2, a resistor R3, a voltage comparator IC1, and the like. a timer 3 consisting of a capacitor C3, a resistor R8, an IM comparator C2, and a switch 4 that switches the operating time of the timer 3 according to the value of the temperature detection element 15. and a negative i that turns on and off the load a with the output of the timer 3: - A negative a that is configured as an I controller 5 and determines the cycle of the pulses generated by the pulse generator 2 and the operating time of the timer 3. 1. However, as shown in FIG. 2, if the divided voltage Vs of the temperature detection element R15 and the resistor R11 changes as shown in the figure, the voltage comparator The output voltage VD of IC3 follows the change, and the on/off operation is repeated.When the on/off operation is repeated near the switching point of the operation time of the timer 3, the output of the timer 3, In other words, since the load controller 6 repeats on-off operations, if the load controller 6 has a mechanical contact such as a relay, the life of the contact will be significantly reduced. In the case of an element, problems such as generation of flicker noise occur.

OBJECTS OF THE INVENTION The present invention provides data for a device that performs load decoupling control.
The present invention provides a pulse generator that generates pulses with a constant cycle, and a pulse generator that generates pulses with a constant cycle;
a timer that operates in synchronization with the pulses generated by the pulse generator and for a predetermined period of time equal to or less than the cycle of the pulses; a switch that switches the operating time of the timer only at a timing synchronized with the pulse; and the switch A signal generator that outputs a switching instruction signal asynchronously with the pulses generated by the pulse generator, and a load controller that drives the load with the output of the timer.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 is a block diagram showing the configuration of the present invention, which includes a pulse generator 2 that generates pulses with a constant period, and a predetermined pulse that is synchronized with the pulses generated by the pulse generator 2 and whose period is equal to or less than the period of this pulse. A timer 3 that operates for a time, a switch 2 to 6 that switches the operating time of the timer 3 to UJ only at a timing synchronized with the pulse, and a switch 6 that generates the pulse?
! and an i+"r"J generator 4 which outputs a switching instruction signal asynchronously with the pulses generated by the pulse generator 10, and has a duty ratio determined by the period of the pulses generated by the pulse generator 10 and the operating time of the timer 3. The load controller 5 is turned on and off accordingly.

Figure 4 is its circuit diagram, where 1 is connected to an AC power source,
A half-wave rectifier circuit that supplies DC voltage to each block below,
2 is a pulse generator consisting of a beak number circuit including a resistor R3 and a capacitor C2, and a norm circuit including a voltage comparator IC1;
is a timer consisting of a time constant circuit of resistor R9 and capacitor C3, and voltage comparator IC2, and 6 is a timer consisting of resistor R16 and resistor R1□
4 is a temperature detection element R.
12 and a voltage comparator 'C3, the signal generator 5 is a load controller that turns on and off the load a.

The operation of the above configuration will be explained below. When C is connected to an AC power supply, a DC voltage is supplied from the half-wave rectifier circuit 1, and the capacitor C2 is charged via the resistor R3 to the voltage divided by the resistor R4 and the resistor H, and the resistor R and the resistor Resistor R7 is divided by parallel circuit of R7 and resistor R4.
and discharging via the diode D4 are alternately repeated. Voltage comparator IC1 therefore generates a pulse vT as shown in FIG. When this pulse vT is low, capacitor C2 is discharged via diode D5,
When T is...A, the sixth voltage is charged via resistor R9 by the voltage divided by resistor R1° and resistor R11, or by the divided voltage by the parallel circuit of resistor R11 and resistor R18 and resistor R9. As shown in the figure, the output ``o'' of the voltage comparator 'C2 has predetermined operating times T1 and T2 that are synchronized with the pulse vT and shorter than the period TO of the parenthesized pulse vT. The load controller 5 determines the period T of this pulse. The load is applied at a duty ratio determined by the operating time T1 or T2 of the timer.

Switching between the operating times T1 and T2 of this timer is performed by the output Q of the D-type flip-flop c4. On the other hand, this D type Furino Dunlop 'C4 clock manual T
K is applied with a waveform obtained by differentiating the pulse vT by a differential II-J path consisting of a resistor R16, a resistor R1□, and a capacitor C4. It is taken in and output to output Q. Therefore, as shown in FIG. Even if the voltage vA fluctuates/the on/off operation is repeated in short cycles for a certain period of time, the output of the timer 3
1 or T2, and the repetition of the on/off operation of the output voltage VD of the signal generator 4 at times other than the falling edge of the pulse T is eliminated.

In the above embodiment, the load controller 6 is used as a relay to eliminate the repetition of on/off operations near the set value that shortens the life of its contacts. Advantages of the Invention As explained above, the data control device of the present invention can solve the problem of flickering that occurs during operation.
By switching the duty ratio only at specific timings, the life of the load controller can be extended and flicker can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the conventional example, FIG. 2 is an operation diagram showing the operation of the conventional example, and FIG. 3 is a block diagram showing the configuration of the present invention.
FIG. 4 is a circuit diagram showing an embodiment of the present invention, and FIG. 5 is an operation diagram showing the operation of the embodiment. 2...Pulse generator, 3...Timer, 4...Signal generator, 5...Load controller, 6...Switcher.

Claims (1)

[Claims] A pulse generator that generates pulses of a constant period, a timer that is synchronized with the pulses generated by this pulse generator and operates for a predetermined time shorter than the period of this pulse, and an operating time of this timer that is synchronized with the pulse. A switch that switches only at the timing, a signal generator that outputs a switching instruction signal to the switch asynchronously with the pulses generated by the pulse generator, and a load controller that drives the load with the output of the timer. Configured data control device.