JPS62217825A - Power controller for complexed load - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling power to a mixed load including a discharge lamp and a thermoelectric lamp.

(Prior Art) As a conventional device of this type, there is one in which a phase control element circuit is attached in series to a mixed load, and the total current is phase controlled to adjust the power.

(Problem to be Solved by the Invention) However, in the above device, as the conduction angle in the phase control element circuit is reduced, the luminous intensity of thermoelectric lamps such as C1 incandescent lamps decreases due to the reduction of Joule heat. However, with discharge lamps such as fluorescent lamps, the luminous intensity hardly changes, and only the duration of the intermittent light emitting device improves, and there is no visible dimming, so thermoelectric lamps A visual imbalance occurs between the lamp and the discharge lamp.

In addition, if a thyristor is used as a mixed load, and the gate signal power source is 1!7 from the mixed negative and same circuit side to control blinking of a neon sign, etc., the phase control element circuit is mixed. During the period of non-conduction with respect to the load, the gate signal is not applied, so the firing phase of the thyristor is concentrated at the start point of conduction of the phase control element circuit, or is limited to the conduction phase period, causing blinking. The number of times will vary depending on the operation of the phase control element circuit.

(Means for solving the problem) The present invention connects the primary coil of a transformer in series with a mixed load including a discharge lamp and a thermoelectric lamp, and the secondary coil is short-circuited by a bidirectional control element circuit. The secondary coil current is phase-controlled to control the power supplied to the load, and in the phase before the firing phase in the bidirectional control element circuit, the primary coil's load The impedance drop caused by the current is large, and the voltage applied to the discharge lamp becomes less than its discharge starting voltage. In the ignition phase, the secondary coil is short-circuited and the impedance drop becomes small, and at this time or The voltage applied to the discharge lamp at a phase in the vicinity thereof is set to be equal to or higher than the discharge starting voltage.

(Function) In the phase before the ignition phase in the bidirectional control element circuit, the discharge lamp is at rest.

Since the secondary coil of the transformer is open at this time, the impedance of the primary coil becomes large, and a small current is supplied to the thermoelectric lamp during this period. Therefore, by appropriately setting the impedance of the primary coil in relation to the load current, the amount of dimming of the thermoelectric lamp can be moderated as appropriate.

(Example) FIG. 1 is a block diagram showing the phase relationship of the control system,
The detailed circuit diagrams of each control section A and 8.0 are shown in the second section.
3 and 4.

In the figure, the R phase (not indicated by human power RA and output RB), and the T phase (also indicated by TA and T8), use a sine wave input, and the output is used for discharge lamps such as fluorescent lamps and thermoelectric lamps such as incandescent lamps. The S phase, denoted by the symbol S, is used for a mixed load including the fan load, which will be described later, between the R phase and the R phase.

Hereinafter, regarding the R phase, its input terminal RA is connected to one end of the primary coil PCI of the R phase transformer TRI via an overcurrent protection breaker CBR1, and the other end of the primary coil PC1 is connected to a similar breaker CBR2. Output terminal RB via
It is connected to the.

Also for T phase, breaker C [3T1. CBT2 and the primary coil ρC2 of the T-phase transformer TR2 are similarly connected.

As shown in FIG. 3 for one of the transformers TR1 and TR2, for example, each terminal of the secondary coil S01 of the transformer T1 each anode A1 (denoted as TR2)
．． Δ2 is connected, which forms a short circuit for the secondary coil SC1.

Note that the capacitors C1 and C2 are for noise absorption.

The one-way control element SCR is the gate G of the triac TH.
It is connected to and controls its ignition. The unijunction transistor UJT1 controls the firing of the control element SCR, and since the voltage used is different from that of the triac TH, its power source is obtained by converting the voltage on the secondary side of the transformer junction R1 with the transformer TR3. ing. The base Bl
, B2 is applied to the diode D1. Wave by D2! I! It forms a trapezoidal wave voltage which is passed through the resistor R1 and clamped by the Zener diode D3. The resistor R2, the variable resistor R3, and the capacitor C3 constitute a charging time constant circuit, and the capacitor C3 is charged starting from the phase of the O potential of the AC power supply, that is, the phase of the trapezoidal wave voltage at zero level, and the emitter C3 is charged. The time it takes for the potential of E to reach the trigger level and generate a pulse is determined by the variable resistor R3.
Adjustable by . The control element SCR and transistor UJT1 are the trigger circuit TG of the triac TH.
(indicated by TG1 and TG2, respectively in FIG. 1). A discharge lamp depends on its ballast.
The triac TH becomes an inductive load and the load current has a lagging phase with respect to the power supply, so the triac TH is connected to the transistor UJ.
If a narrow pulse width bird of TI tries to ignite it with current, ignition becomes uncertain, especially in the phase near where the power supply voltage is at O potential when the phase is greatly advanced or delayed. The control element SCR is provided to compensate for this. Between the gate and cathode of the control element SCR, a voltage across the terminals of a resistor R4 due to the pulse current of the base B1 of the transistor UJT1 is received, and when the transistor UJTI is fired, the triac TH is generated by the current passing through the resistors R5 and R6. The voltage of the resistor R5 is applied to the gate G of the circuit so that it is ignited. Resistance R
7 and capacitor +t C4 are used to bypass the back electromotive voltage when the inductive load applied to the triac TH is cut off. The current detection WDE detects the current of triac T1 (1) and is used separately.

As shown in Fig. 4, in IJI/-RLl, when the changeover switch SWC is operated and closed, the relay coil RC is energized and activated, and the R-phase and T-phase contact switches SWR and SWT are turned off. Thus, the circuit of each breaker CBR1, CBR2 and transformer TR1, and each breaker CBT1 . CBT2
and the circuit of the transformer TR2 are short-circuited to form a direct feed circuit, that is, a power supply circuit that does not go through each transformer TR1, TR2. At this time, the I direct feed pilot PD lights up via the contact switch SWD, and at the same time the contact switch SWE When the power saving pilot PE is opened, the power saving pilot PE turns off.

Note that PS is a power supply pilot. Relay RL2 is activated when breaker C[3R1 or CBTl is cut off, actuating relay RL1 to switch to the direct transmission, and lighting up current abnormality pilot PC. Temperature fuses TF are built into the transformers TRI and TR2, and they are blown out when the temperature becomes abnormal. At this time, relay RL3 is activated, which activates relay RL1 to switch to the direct transmission, and when the temperature is abnormal, The pilot PH is lit. Transformer TR1,
TR2 also has a built-in thermistor S, which is activated by sensing the temperature rise, and the transistor Tr, unijunction transistor UJT2, and pulse transformer T.
The triac TH3 is phase-controlled via R4 to control the rotation of the fan FA. In other words, when the temperature rise becomes large,
Thermistor TS has a small resistance, and capacitor'JC
5 is accelerated, the firing phase of thyristor TH3 is advanced, and the rotational speed of fan FA is increased. PF is a pilot that displays fan operation. Note that TR5 is a voltage reducing transformer, RB is a rectifying bridge, and R8 is a sensitivity adjustment resistor R9 of the thermistor TS, which is a temperature setting resistor of the thermistor TS.

The initial timer relay circuit RL4 is activated when the power of this device is turned on, and automatically closes the contact in parallel with the changeover switch SWC for a predetermined period of time until the load current stabilizes, thereby allowing the direct feeding. , lights up the initial timer pilot PT.

In the above configuration, the load current characteristics will be explained.

Before explaining this device, in the case where the triac TH is directly connected to a load circuit that does not include a discharge lamp, as shown in Fig. 5 (A), the horizontal axis is time and the vertical axis is current.
When the triac TH fires at the point C, it rises steeply and then becomes almost sinusoidal according to the power supply voltage, until it reaches the point C.
'r--The half cycle ends with extinguishing, and this is repeated.

Figure 5 (B) shows the load current characteristics of this device, and the relay R
It is assumed that LI is inactive to save power, and the output RB,
It is assumed that a mixed load including a discharge lamp and an incandescent lamp is connected between the TBs. During the period from time O to time A when the triac TH fires, the secondary coil SC1 of the transformer, for example TR1, is open, so that the primary coil PCI
It acts as a beam actor and has high impedance. Therefore, the impedance drop caused by the current flowing through the thermoelectric lamp or the like is large, and the discharge lamp does not start discharging. Here, if the constant of the transformer TR is set so that the impedance due to the reactor and the thermoelectric lamp is, for example, 2 f of the impedance of the thermoelectric lamp, the current value shown by the solid line is the impedance of this impedance. Assume that is O!
, : becomes 1/2 of the current value in case. In other words, the current shown by the solid line in the period OA is the current of the thermoelectric lamp, etc., and is reduced by setting the period according to the firing phase of the triac TH, and this contributes to the emission of the thermoelectric lamp. The electric current of the lamp is O. Time A is the ignition phase of the triac TH, and the power supply voltage at that time is set as follows to enable the discharge lamp to start discharging. When the triac TH fires at time A, the secondary coil SC1 of the transformer TRI is short-circuited, so that the primary coil PC1 becomes resistive and low impedance. Therefore, the impedance drop becomes small and the discharge lamp starts discharging. Period A in the diagram
The current B is a current obtained by increasing the current of the thermoelectric lamp 1 because the impedance has become small, and adding the current of the discharge lamp. Note that the phase of the start of release does not necessarily match the ignition phase, and may vary depending on the temperature (1°).If the discharge lamp becomes below its holding current at time B, the discharge will be stopped and the current will be reduced by the load current of the discharge lamp. becomes.

Although it is not shown in the figure, if, for example, Cyrisk is used as a mixed load, and the power for the gate signal is obtained from the mixed load circuit side to control blinking of a neon sign, etc., even if d3 is used, the transformer Regardless of whether the secondary coil is open or closed,
Since the voltage necessary to obtain the gate signal is applied to the mixed load circuit side in accordance with the FA voltage, the blinking control described above becomes smooth.

<Effects of the Invention> As explained above, according to the present invention, the phase-controlled load current has a control period commonly supplied to the mixed load,
There is a control period in which the discharge lamp is stopped and supplied to the thermoelectric lamp, etc., so the amount of light from the thermoelectric lamp is relaxed, and as for the discharge lamp, the light emission period does not change except for the emitting pause time, so the visual effect is improved. This has almost no effect on brightness, making it possible to achieve well-balanced dimming, and for discharge lamps, it is possible to save electricity without changing the brightness too much.

Also, even if the mixed load includes something that uses Cyrisk to control the blinking of neon nine, etc.
Since the gate signal is not affected by the load amount, blinking control becomes smooth.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a control system showing an embodiment of the present invention;
FIGS. 2, 3, and 4 are circuit diagrams without showing details of each part of FIG. 1, and FIGS. 5 (Δ) and 5 (B) are explanatory diagrams of load current characteristics. TRI, TR2...Transformers TH, THL, TH2...Triac (bidirectional control element)

Claims (2)

[Claims] (1) A device for supplying power to a mixed load including a discharge lamp and a thermoelectric lamp using an AC power source, comprising: a transformer whose primary coil is connected in series with the mixed load; and a secondary coil of the transformer. 1. A power control device for a mixed load, comprising: a bidirectional control element circuit that constitutes a short circuit for a secondary coil and controls the phase of a current in the secondary coil. (2) A device for supplying power to a mixed load including a discharge lamp and a thermoelectric lamp using an AC power source, comprising: a transformer whose primary coil is connected in series with the mixed load; a bidirectional control element circuit that constitutes a short circuit of the secondary coil and controls the phase of the current of the secondary coil, and in the phase before the firing phase in the bidirectional control element circuit, the secondary coil Because the coil is open, the load-side terminal voltage of the primary coil is less than or equal to the discharge starting voltage of the discharge lamp, and at or near the ignition phase, the secondary coil is closed, so that the voltage at the load side terminal of the primary coil is equal to or higher than the discharge starting voltage. A mixed load power control device characterized in that the impedance drop of the primary coil is set as much as possible.