JPS5886613A - Power controller - Google Patents

Abstract

PURPOSE:To control supplied electric power easily and simply without noise and voltage variation by connecting rectifying elements which differ in direction in series to loads divided to nearly equal electric capacities and then connected in parallel, and providing a switch between said loads. CONSTITUTION:Between input terminals 2-1 and 2-2 connected to a commercial power source 1, the series circuit of a rectifying element 4-1 and load 5-1, and the series circuit of a rectifying element 4-2 and load 5-1 are connected in parallel through a switch 3-1. Further, the connection point between the rectifying element 4-1 and load 5-1 and the connection point 6-2 between the rectifying element 4-2 and load 5-2 are connected together through a switch 3-2. Those rectifying elements 4-1 and 4-2 are connected in the opposite rectifying directions to the commercial power source 1, and the loads 5-1 and 5-2 are nearly equalized in electric capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION - The present invention relates to a power control device that controls power supplied to a kakujutsu powered by an AC power source.

For example, in equipment that is driven by commercial power and consumes a relatively large amount of current, such as the thermal footing device used in a copying machine, the power consumption pipe may be limited to a value smaller than the maximum value that can be supplied, or frequently Repeat ON - OFF f
It is known that the following problems occur when In other words, a phase control device is generally used to limit the power consumption to a value smaller than the maximum allowable power consumption, but how can the phase control device generate significant electrical noise? Therefore, K is made of multiple fibers and requires an expensive noise prevention circuit. Also, reduce the power supply to O
In the case of N-OFF, the power supply voltage fluctuates, causing flicker 1 particularly in lighting devices such as fluorescent lamps, giving an unpleasant impression. To completely prevent this, ON -OF
It is sufficient to pass through an intermediate power supply state during F, but
Conventionally, there is no known device that can simply and easily operate such an intermediate power supply pipe without using the above-mentioned phase control device.

This invention was made in view of the above-mentioned points, and the power supply pipe electric noise and power supply voltage fluctuation 1. Most of the occurrences of power supply pipe electric noise and power supply voltage fluctuations. The objective is to provide the following.

The present invention provides a power control device for controlling a supply power pipe to a load driven by an AC power supply.
A rectifying element is connected in series to each load, and a series circuit of these loads and a rectifying collector is connected in parallel to the AC power supply, and a full wave current of AC is applied to each load. The present invention is characterized in that a control means is provided for selectively occupying the first state in which the AC half-wave current is alternately supplied to each load and the first state in which the AC half-wave current is alternately supplied to each load.

The present invention #4t will be explained in detail below with reference to all the drawings.

2 is a circuit diagram showing the basic structure of the power control device of the present invention. A series circuit of rectifying element Ku/ and load j-/ and a series circuit of rectifier Darko and load j-2 are connected between input terminal λ-7 connected to commercial power supply/Km and Koko via switch 3-/. Connect in parallel and connection point 6-1 between rectifier element Cool 1 and load j-7, rectifier collector ≠-2 and load! - is connected to the connection point 6-2 via the switch 3-1. The rectifier collector Goo/ and Darko are connected to the commercial power supply/ so that their rectifying directions are opposite to each other, and the load! -/and! -λ makes its capacitance equal to so.

The operation of the power control device shown in FIG. 7 will be explained with reference to all the waveform diagrams shown in FIGS. 5-E. The commercial power source / supplies an alternating current as shown in Figure λ. Now, switch J-, 2 (second
(See Figure E) i When turned off, switch 3-/
(Refer to the second diagram) When it is set to 1rON, when the polarity of the current is in the forward direction with respect to the rectifying element 4 (-/), the load j-
Current flows in 11 directions as shown in Figure B through the rectifying element Hiroshi//, but the load! For -2, the rectifying element cooler is connected in the blocking direction, so the iI current does not flow as shown in Figure 0 of 1iRJ. When the polar brightness of the current is reversed,
Since the rectifying element (see-l) connected in series with the load j-7 is in a cut-off state, the load! -/ #i current does not flow into /, but load! A current 12 flows through the rectifier -2 through the rectifier -Jl. Therefore, half waves of alternating current flow alternately to each load z-, i, z-1, and half the power is supplied to the maximum power supply, so even if the switch i -i 2ON -0FF Since the power supply voltage does not fluctuate, and the positive and negative currents flow from the power supply l, equal amounts of current flow, so waveform distortion does not occur.

Next, with switch j-/'1ON4c, switch J
-When set to J'lON, the polarity of the current changes! ! During the half cycle in the forward direction with respect to the -tk reciprocal game l, the rectifier element reference-l is connected to load j-/, j-1 with respect to 11. i,'
When the current flows in the direction, the polarity of the current becomes reversed. During the half cycle, the load z-i,
A current flows in 12 directions at 1°' in z-co. Therefore, the full power of the alternating current flows through the negative @r-i and j-co without any restriction, so that all the power is supplied to the negative @r-i and j-co. Further, in this case, since the power is switched from medium power supply to full power supply, there is almost no power supply voltage fluctuation.

As is clear from the above description, in the power control device shown in FIG.
! -2 can be controlled between full power supply and half power supply, and when switch 3-1 is OFF, switch J-2 can be controlled.
/QON-OFF allows full control of medium power supply and zero power supply.

FIG. 3 is a circuit diagram showing the configuration of another example of the power control device of the present invention. In this example, the switches 3-i and 3-1 of the power control device shown in FIG.

It is activated by a signal applied to relay 7, and its role is the same as switch 3-1 in FIG. 771, As a switch corresponding to the switch J-/ in Fig.
Connect o, it and photocoupler tJk. resistance/
This is a current limiting resistor for the light emitting diode of the jij photocoupler/co, and this light emitting diode is activated by a signal applied to the input terminal 1-/. In this example, when the signal applied to the input terminal 1-/ is in the OFF state, the light emitting diode of the welfare photocoupler l does not emit light, so the resistance of the photocoupler saw's light-receiving device (in this case, the CdS cell) is large, and the system Therefore, the resistor //Ilt generates only a small voltage of 1J, so the trialer 22 does not conduct. This state corresponds to the case where switch J-/ is OVy in FIG. When a t-tK signal is applied to the input terminal, the light-emitting diode of the photocoupler saw emits light, and the resistance of its light-receiving element decreases. This generates a large voltage across the resistor l/, and the triac l becomes conductive. This state corresponds to the autumn cram school where switch J-/ is ON in diagram wJ1.

Therefore, by applying the required signal to the input terminals 1-/, I-1, the switches 3-1, ! of FIG. -1f
The same action as opening and closing can be performed.

lK! The figure is a circuit diagram showing the configuration of another example of power control and device history 1c of the present invention. In this example, ko loads! −/, j
-Triac/tar/ , /4I in series with -
- Connect one to each triac.

l#-2 trigger circuit is resistor/j-/, /j-2, resistor/4-/, #-2, diode/7-/,
/7-2 and photocoupler /I-/, /r
-21 are connected in series, and the diode/7
-/, /7-J are connected in parallel with photocouplers /I-J, /ZA1≠, and a control signal applied to photocouplers /I-/~/I-μ allows the truck 1 to be turned on, l≠-l, /
≠ - tON - OFF It is designed to function as a switching element and a rectifying element.

Note that the diodes /7-/ and /7-2 are connected in opposite directions to the power supply l.

The input terminal l is a terminal that adds a signal to turn ON and OFF the triac /II-/, /Darko'i.
Switch in the diagram! -/, , corresponds to the input terminal If-/ in the vAJ diagram, and when the signal to this terminal is at the OFF level, the light-emitting diodes of the photocouplers tt-/ and it- do not emit light, so the resistance value of the CdS cell is is large, and the resistance is /6-/.

The current flowing through the lt-co is small, and the triac l≠-/
, /≠- Since a small voltage is not applied to the gate of the triac, it is in the OFF state. When an ON signal is input to the input terminal l turf, the light emitting diodes of the 7-oto couplers /I-/, /r-co light up and the electrical resistance of the CdS cell decreases, so the triac/4
A trigger signal is applied to I-:/, /4t-λ, and the circuit becomes conductive.

It is an input terminal for a signal that controls sound whether to apply an AC full wave or a half wave to the input terminals fj+it-/, t-1, and is connected to the switches 3-. 2. Corresponds to the input terminal l-2 in FIG. 3, and a signal to this terminal can optionally disable the rectifying action of the triac, l-/, /l-1. That is, when the input signal to the input terminal /P-1 is in the OFF state, the resistance value of the Od8 cell of the photocoupler /I-j, /I-hiro is high, and therefore the diodes /7- /, / TRIAC/T/ only when forward voltage is applied to 7-
, /$-1 becomes conductive. Diode /7-/
, 17-2 Since the connection direction is reverse to the power supply l, the half cycle of the poem in which a half cycle of the power supply flows to the load j-, is the load j-, ? Flows through a pipe. Therefore, a full-wave current flows from the power source 1, but a half-wave current flows through each load 1/2 and J-2.

Also, when an ON signal is applied to the input terminal 2, the resistance value of the Od8 cell of the photocoupler /r-J, /I- decreases, so the diodes /7- / and /7- are in a shorted state. , and the trigger signal is generated for the full wave of alternating current, TRIAC /II-/.

1 reference-λ becomes a slow @OH state.

Next, a case where the heater is used in a heat fixing device of the above-mentioned load s-i, z-x copying machine will be explained.

1RjvA is a diagram showing a configuration IIi of an example of a control signal generation circuit that completely controls the amount of heat generated by the heater. In this example, a thermistor λ/, a resistor -2λ, 3 and 3 form a bridge circuit, and the output of this bridge circuit is applied as a total temperature detection signal and a reference voltage signal to an operational amplifier j.

When the temperature detected by the thermistor / is low, the resistance value of thermistor J/ is large, so a voltage is generated at the connection point between the resistor here and thermistor l, and the operational amplifier circuit j U
Chips occur when the unit is turned on.

Therefore, in Figure 1R1, Figure 97, or Figure Reference,
A constant ON signal is supplied to switch 3-7 and input terminal 1-/or lter/, and the operational amplifier shown in t'j diagram is connected.
At the output of switch 3-2 (see figure 14), turn on the switch 3-2 (see figure 14) or apply the output of operational amplifier j to input terminal l-co, /ter2 (see figure 3, @see figure). Full power is supplied to heaters), r-i, and s-1. When the temperature of the heater rises and the resistance of the thermistor l falls, the operational amplifier jibOF]r state occurs, and the switch 3 turns off, or the signal applied to the input terminal l and turret turns off. Since it is OFF, the load j-/, J-1 is
Each half-wave current flows and the supplied power is much reduced. If the temperature of the heater drops due to a decrease in the supplied power, the thermistor knob detects this and generates a control signal to supply full power to the load again, thus maintaining the heater at a predetermined temperature.

, 1plA is a diagram showing the configuration of another example of a control signal generating circuit for controlling the amount of heat generated by a motor. In this example, according to the thermistor, the heater can be energized in three states: full power supply, medium power supply, and power supply OFF, depending on the temperature level detected by the heater.

Thermistor 1, resistor here~ko, and operational amplifier
The circuit consisting of is connected in the same configuration as in the w+j diagram, and its operation is also the same. In this example, a new resistor λt, a core, and an operational amplifier t' are added, and the output of this operational amplifier l causes the switch shown in FIG. -/f control, this output 00 figure, l! In addition to the input terminals r-t and i-tar l shown in the figure, the tri-arafter, triac l≠-/, #-J [controls. A reference voltage is applied to the resistor 26, 27B operational amplifier 1, and a comparison sound with the voltage at the connection point between the thermistor tacho/ and the resistor 2 is performed by the operational amplifier 1 to generate a control signal. Operational amplifier 2j is O at the first temperature setting level.
Set the value of resistor -3 and resistor so that it turns off, and turn on the operational amplifier at the second temperature setting level higher than this.
-Determine the values of the resistor t and core so that the OFF signal tube is generated. And Ope Ambuco! The output of the switch 3-λ in FIG.
Connect the input width as shown in the figure, adding it to 1 child t-co and l turco.
, the output of the operational amplifier at causes the switch J- in Figure 9/
/', or connect the output 1tBJ to the input terminals 1-/ and /tar in Figures 1 and 2. In this way, when the temperature detected by the thermistor l is low, the switches J-/ and J-2 are both ON, and the input terminals r-i, r-x, and 1t-i are turned on.

/ 4ON signal is added to Turco and it is loaded! -/, full power is applied to j-2. When the temperature of the thermistor λ/ becomes high and reaches the temperature setting level of 甽, the operational amplifier 2j turns OFF and the switch J becomes OFF'tST.
Or, the signal applied to the input terminal l-λ+/P-1 is O
It becomes an FF, and each half-wave current flows through the loads j-/ and j-λ. Furthermore, when the temperature detected by the thermistor 2/ rises and reaches the second mis level, the operational amplifier λ
l is activated and switch 3-/ is OFF,! -Ruka,
Or input terminal J'-/.

/The signal applied to the terminal turns off and the square load j-7
．． ! - Power to one stops. When the temperature detected by the thermistor U/ changes from a high temperature to a low temperature, the amount of current applied to the load increases in accordance with each detected temperature in the reverse order of the above explanation.

In the above description, an example is shown in which a thermistor is used as the temperature sensing element, but it is also possible to use another temperature sensing element such as a thermocouple, and a corresponding signal generation circuit may be used. It is also possible to use a photocoupler or the like with a different configuration, and the circuit fj! based on these changes can be used! is something that can be easily implemented by island contractors.

In addition, FIG. 7 shows the control circuit shown in FIGS. 3 and 6.

When the power control device shown in Figure 3 + lR4' is driven and the specified temperature is fully detected, the medium power is controlled, so overshoot of the heating element is prevented and highly stable temperature control can be performed. can.

As described above, according to the present invention, it is possible to control the power supplied to the load differently without causing fluctuations in the power supply voltage or generation of electrical noise that causes electrical disturbances. can.

In addition, when the load is a heating element and the temperature of this heating element is detected to control the power supply pipe to the nuclear heating element, overshoot of the heating element due to delay in response of the temperature detection element can be effectively prevented. can do.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the basic configuration of the power control device of the present invention, and the operation of the device shown in FIG.
, FIG. 3 is a circuit diagram showing the configuration of another example of the power control device of the present invention, FIG. 1 is a circuit diagram showing the configuration of still another example, and FIG. ! Figure 1, 3rd
Figure 6 is a diagram showing the configuration of an example of the mlm-signal generating circuit applied when the load is connected to a heater, and Figure 6 is a diagram showing the configuration of another example. /...Commercial power supply, -Kohako-2...Input width, child,
J-/. 3-. 2...Switch, darl, reference-2...set tl
t Yuko, z-/,! -1...Load, 4-/, 4-2.
...Connector, 7...Relay, rt, t-co...input terminal, ri...triac, 10. //, /3
...Resistance, /Conflict...Photocabra, /#-/, /4
t7co...triac,/! −/,,′/j−2゜/4−/,#−,? ...Resistance, /7-/, /? -2・
...Diode, /I-; /゛~/l-Hiroshi...Photocoupler, /ter/, /ter2...Input terminal, Coto...Thermistor, -1~2II, Coro. Core...resistance, Ko! , 21... operational amplifier.

Claims (1)

[Claims] 1. In a power control device that controls power supplied to a load driven by an AC power source, the load is divided into y equal electric capacities and a rectifier is connected in series to each load. ,
A series circuit of these loads and a rectifying element is connected in parallel to the AC power supply, and AC full-wave current is supplied to each load, and AC half-wave current is alternately supplied to each load. 1. A power control device characterized in that the control means selectively occupies a first state in which: ' 2. Let the negative iii be a heating element, and the temperature of this heating element! Claim 1, characterized in that means for detecting all conditions are provided, and the control means is configured to select the lth state and the first state tube based on the detection output of the temperature detection means. The power control device described in Section 1.