JPH0511677Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a staged dimming device for medical lighting, and more specifically, to adjust soft dimming moods in multiple stages for multi-lamp lighting such as surgical lighting. This invention relates to a light control device that can control light.

[Conventional technology] For example, a conventional lighting light control device was developed in 1975.
There is something described on page 424 of "Practical Electronic Circuits Handbook (2)" published by CQ Publishing Co., Ltd. on October 20th.

As shown in Figure 6, this conventional technology dims an incandescent light bulb LA by applying a trigger pulse obtained from a unidirectional transistor UJT to the gate of a power control triax TR via a pulse transformer PT. .

In other words, the variable resistor VRO connected to the gate circuit of the unidirectional transistor UJT
The light bulb is continuously dimmed by operating the variable resistor VRO of the time constant circuit consisting of a capacitor CO and a capacitor CO.

[Problems to be solved by the invention] The above-mentioned conventional technology applies an inrush current to the incandescent light bulb LA when it is turned on, which has a negative effect on the life of the incandescent light bulb. If you want to speed up deterioration and reduce the inrush current as much as possible, you have to start the control variable resistor VRO from the lowest position, which is a cumbersome operation.

In order to eliminate each of the above-mentioned problems, this invention uses a step-type (step-type) dimming circuit with multiple tact switches in the dimming circuit operating section, so that the desired illuminance can be selected with a single touch. In addition, the fade-in/fade-out action eliminates inrush current to the bulb and control components, protects each component, and allows shift adjustment of dimming step illuminance change settings within ±20%. The purpose is to

[Means for Solving the Problems] The purpose of this invention described above is to provide at least three or more tact switches, a tact switch operation hold circuit that holds each operation of each of these tact switches, and a plurality of outputs of this circuit. On the side, there is a bleeder circuit that divides the voltage of the DC generated in response to the operation of the tact switch, a fade-in/fade-out circuit that applies variable voltage divided by this bleeder circuit to charge and discharge a capacitor, and a fade-in/fade-out circuit that corresponds to the frequency of the AC power supply. a triangular wave generation circuit that obtains a triangular wave voltage with a repetition frequency of a triangular wave voltage; a load power setting value shift amount adjustment section that changes the level of the triangular wave voltage; and a difference between the DC voltage that has passed through the fade-in/fade-out circuit and the triangular wave voltage that is input. A trigger pulse output section consisting of a dynamic amplifier, etc., a solid state relay controlled by the trigger pulse from the trigger pulp output section, and a medical device connected in series between the solid state relay and the AC power source. This is achieved by providing each with a lighting lamp.

[Function] Individual operations of at least three or more tact switches are held in a tact switch operation hold circuit, and a DC voltage is taken out to a plurality of output sides of the tact switch operation hold circuit in response to the operation of the tact switch, By dividing this DC voltage with a bleeder circuit, a DC voltage whose voltage changes in response to the operation of the tact switch is detected, and this detected voltage is passed through a fade-in/fade-out circuit by charging and discharging a capacitor to a differential amplifier, etc. input to the input side of the trigger pulse output section.

On the other hand, the level of the triangular wave voltage with a repetition frequency corresponding to the frequency of the AC power source taken out from the triangular wave generation circuit is changed by the load power setting value shift amount adjustment section, and the triangular wave voltage whose level changes is applied to the trigger pulse output section. By inputting to the other input side, the solid-state relay is controlled by the variable-level trigger pulse obtained from this trigger pulse output section corresponding to each operation of the tact switch, and the solid-state relay and the alternating current The medical lighting lamp connected to the power source can be dimmed in multiple stages and in a soft dimming mood.

[Example] Examples will be described with reference to the drawings.

The general structure of the staged dimming device for medical lighting lamps of this invention is as shown in the system circuit diagram in Figure 1.
First, connect the commercial AC voltage source AC to the primary side of the transformer T1, and connect the low voltage secondary side to the DC constant voltage source circuit.
Connect to DC to obtain the desired constant DC voltage +B.

Next, a plurality of touch switches S0 consisting of well-known touch switches for changing television channels, etc.
~Tact switch operation hold circuit consisting of a touch switch operation hold circuit etc. in a well-known television tuner for storing the operation of S5
Establish an SH.

The trigger pulse input section CP of this circuit SH detects the pulsating current component contained in the DC output of the DC constant voltage source circuit DC corresponding to each operation of the tact switches S0 to S5 using the pulsating current voltage detection section MV. It is taken out and applied via the trigger pulse application circuit TP corresponding to each operation of the tact switches S0 to S5.

and the tact switch operation hold circuit.
Each of the multiple output sides of the SH has a light emitting display element.
LED0 to LED5 are provided, and a DC level voltage corresponding to the individual operation of the tact switches S0 to S5 is extracted from each input side of each of these light emitting display elements LED0 to LED5 through a bleeder circuit BR, and this voltage is It is input to a fade-in/fade-out circuit F that uses the charging and discharging action of a capacitor.

On the other hand, the second voltage generated on the low voltage secondary side of the transformer T
A low-voltage AC voltage V as shown in Figure a is passed through a DC isolation and zero cross detection circuit Z to obtain a half-wave rectified waveform voltage V1 as shown in Figure 2b, and this half-wave voltage V1 is passed through a waveform shaping circuit W ( (including a polarity reversal circuit) to obtain a substantially square wave voltage V2 as shown in FIG. The output voltage V3 {Fig. 2 d} is input to a triangular wave generation circuit DT using an integrating circuit.

Next, each of the plurality of tact switches S0 to S5 is generated at the output side of the fade-in/fade-out circuit F due to the triangular wave voltage V4 as shown in FIG. The triangular wave voltage V4 and the level-variable DC voltage V0 are input to the trigger pulse output section TC for comparison with the DC voltage V0 whose level changes as shown in FIG. 2f corresponding to the operation.

The trigger pulse output section TC generates a trigger pulse P as shown in FIG. solid state relay consisting of
The brightness of the medical illumination lamp L is input to the SSR and is controlled in six steps in a soft dimming mood in response to the operation of the tact switches S0 to S5.

Specific examples of the above-mentioned general components will be described in detail below.

First, a transformer T, a DC constant voltage source circuit DC, a tact switch operation hold circuit SH including a pulsating voltage detection unit MV and a trigger pulse application circuit TP by a tact switch, and tact switches S0 to S
5, the light emitting display unit LED, the bleeder circuit BR, etc. can be well-known, so detailed explanations thereof will be omitted, but the tact switches S0 to S5
As shown in FIG. 3, the trigger pulse application circuit TP connects each output side of the tactile switches S0 to S5 to the first input of the differential amplifier A1 through a resistor R.
A common connection is made through 1 to R6.

Then, as shown in FIG. 3, the pulsating current component in the DC power supply that has passed through the pulsating current detecting section MV, which is made up of a parallel circuit of a capacitor C1 and a resistor R, is applied to the second input of the differential amplifier A1. At the same time, the output side of the differential amplifier A1 is connected to the trigger pulse input section CP of the tact switch operation hold circuit SH.

Next is DC isolation and zero cross detection circuit Z
As shown in Part 3, a well-known device using a light emitting element LD and a phototransistor PT is used, and
The waveform shaping circuit W is composed of a transistor circuit with a shallow bias and a grounded emitter configuration.

In addition, the shift amount adjustment section FC for the load power setting value is constructed from a parallel circuit of a semi-fixed volume VR and a diode D in FIG. It consists of a Miller integration circuit including a differential amplifier A2 and a capacitor C1.

The next stage trigger pulse output section TC is a differential amplifier A.
3, the trigger pulse P is applied to the first input, and the DC level is gradually changed to the second input in response to the operation of the tact switches S0 to S6 through the fade-in/fade-out circuit F due to the charging and discharging action of the capacitor C. The wires are connected so that the changing voltage VO is applied.

Then, the trigger pulse P generated at the output side of the trigger pulse output section TC and whose level changes as shown in Fig. 2g is applied to the input side of the solid state relay SSR, and the output side of the solid state relay SSR is applied to the input side of the solid state relay SSR. If necessary, the medical lighting lamp L is connected to the commercial AC power source AC via the transformer T2.
is connected.

In addition, the part indicated by the symbol INV in FIG. 3 indicates six inverter circuits, and the part indicated by the symbol D1 is a diode for forced discharge of the charge/discharge capacitor C for fade-in/fade-out, and D2
~D6 is a backflow prevention diode, D7, D
8 are diodes for extracting pulsating current components in the DC power supply together with capacitor C1, and R7 to R7.
R11 is a bleeder resistor, R12 to R16 are load resistors, R17 to R24 are bias resistors,
R25 to R27 are protective resistors.

The gradual dimming device for medical lighting lamps of this invention is constructed as described above, so that a solid-state relay can be operated in response to individual operation of a tact switch.
It is possible to control the power of the SSR in multiple stages with a slow mood, and therefore it is possible to dim multiple lighting lights in surgeries, etc. in 6 stages with a soft dimming mood that is easy on the eyes.

That is, if the first tact switch S1 shown in FIGS. 3 and 4 is pressed, this operation is held by the tact switch operation hold circuit SH, and the first
The light emitting display element LED1 lights up to indicate that the power is 60%, and the voltage division ratio (R10:R11) of the bleeder circuit BR causes the 2 in Fig. 2g to be displayed.
A 60% level DC voltage as shown by the dashed line is applied to the second input section of the differential amplifier A3 in the trigger pulse output section TC via the fade-in/fade-out circuit F, and the trigger pulse P by the triangular wave is applied to the second input section of the differential amplifier A3 in the trigger pulse output section TC.
is output at a 60% level as shown by the two-dot chain line in Figure 2 f, and the solid state relay SSR is powered at 60% power.
By controlling within the distribution range, the medical lighting lamp L can be turned on slowly in a fade-in manner according to the charging curve of the capacitor C at a power level of 60%.

Note that the load power setting value shift amount adjustment section
By adjusting the semi-fixed resistor VR in the FC, the brightness of the illumination lamp L lit at 60% power can be adjusted from +10% as shown in Figures 2f, 2g, and 4. It can be shifted within the range of minus 10% or plus 20% to minus 20%.

Next, turn off the tact switch S in the above-mentioned lighting state.
Press 0 to activate the tact switch operation hold circuit SH
This operation is held and the light-emitting display element is turned off.
At the same time, the LED 0 displays an off light emission, and at this time, no control DC voltage is applied to the second input section of the differential amplifier A3 in the trigger pulse output section TC, so the output side of the differential amplifier A3 Since no trigger pulse is generated and the solid state relay SSR is not triggered, the solid state relay SSR is turned off, but at this time, the accumulated charge in the capacitor C in the fade-in/fade-out circuit F is transferred to the diode D1 and the resistor R1.
1, the DC voltage at the second input section gradually disappears, and the medical illumination lamp L gradually fades out.

Next, if you operate any of the tact switches S2 to S5, you can obtain the amount of power change as shown in Figure 4 corresponding to the individual operation of each of these tact switches S2 to S5. Direct power supply when operating S5
The lighting lamp L can be turned on slowly in a fade-in manner up to 100%.

The surface covers of the tact switches S0 to S5 are semi-transparent, and S0 to S5 are displayed on this cover, and the light emitting display element is placed inside the surface cover.
By arranging LED0 to LED5, the operated tact switch itself can indicate that it has been operated.
It is convenient to use.

[Effects of the invention] Since this invention is configured as described above, it produces the effects described below.

A step-type dimmer circuit with multiple tact switches is used for the dimmer circuit operation section, so
The user can select the desired illuminance with a single touch, and the fade-in/fade-out function eliminates inrush current to the bulb and control components, protecting each component. This has the effect that the step setting of the step illuminance change can be shifted and adjusted within about ±20%.

[Brief explanation of the drawing]

Figures 1 to 5 are all based on this idea.
1 is a systematic circuit diagram, FIG. 2 a, FIG. 2 b, FIG. 2 c, FIG. 2 d,
Figures 2e, 2f, and 2g are waveform diagrams for explaining the operating states, Figure 3 is a specific circuit diagram of the circuit shown in Figure 1, and Figure 4 is a diagram showing multiple ducts. FIG. 5 is a perspective view showing an example of a medical lighting lamp, and FIG. 6 is a circuit diagram of a conventional dimming circuit. S0 to S5...Tact switch, SH...Tact switch operation hold circuit, BR...Bleeder circuit, AC...Alternating current power supply, F...Fade-in
Fade out circuit, DT... triangular wave generation circuit,
L...Medical lighting, FC...Load power setting value shift amount adjustment section, TC...Trigger pulse output section,
SSR...Solid state relay.

Claims (1)

[Scope of utility model registration request] In a lighting light dimmer device using a solid state relay SSR, at least three or more tact switches S0 to S5 and each of these tact switches S
A tact switch operation hold circuit SH that holds each operation of 0 to S5, a bleeder circuit BR that divides the DC voltage generated in response to the operation of the tact switch on a plurality of output sides of this circuit SH, and this bleeder circuit BR. A fade-in/fade-out circuit F that charges and discharges a capacitor by applying a variable voltage divided by AC, a triangular wave generating circuit DT that generates a triangular wave voltage with a repetition frequency corresponding to the frequency of the AC power supply, and A shift amount adjustment section FC for a changing load power setting value, a trigger pulse output section TC consisting of a differential amplifier or the like to which the DC voltage passing through the fade-in/fade-out circuit F and the triangular wave voltage are input, and this trigger pulse output section. A medical device comprising a solid state relay SSR controlled by a trigger pulse from a TC, and a medical lighting lamp L connected in series between the solid state relay SSR and the alternating current power supply AC. Staged dimming device for lighting lights.