CN2344942Y

CN2344942Y - Secondary voltage light modulator

Info

Publication number: CN2344942Y
Application number: CN 98230522
Authority: CN
Inventors: 刘立吾
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-10
Filing date: 1998-04-10
Publication date: 1999-10-20
Anticipated expiration: 2008-04-10

Abstract

The utility model relates to a light source and voltage dimmer which solves the problems that the existing light source and the existing power supply can not be adjusted. A voltage reducing transformer is in secondary connection with the output end of a rectification filtering voltage stabilizing circuit which is connected with a unijunction transistor triggering control circuit whose output end is connected with a controlled silicon 3CT control board. The controlled silicon 3CT is connected in series with a bulb and is connected with the power supply. The output end of the rectification filtration voltage stabilizing circuit is connected with an undervoltage and an overvoltage alarm circuits. The utility model has the advantages of simple structure and practicality, can improve the use effect of the light source, can improve the service life of the light source, and is an ideal dimmer.

Description

The secondary voltage dimmer

The utility model relates to a kind of light source voltage adjuster, particularly a kind of dimmer of regulating transformer-secondary voltage.

Artistic lighting in troupe's performance or the light units in the dance hall are to adopt low voltage light sources mostly.As: the twin-lens space curtain slide projector that troupe's performance is used, follow spot light during the stage character activities etc., all being to use voltage is 30 volts, power is that 400 watts halogen tungsten bulb is as light source, present power configuration is that 220 volts of voltages are reduced to the stationary transformer of 30 volts of voltages as electric power system, and because thereby the variation of line voltage and load produces very big voltage fluctuation, when troupe send play to go to the countryside performance in addition, usually run into by small hydropower station power supply or diesel power generation, its voltage fluctuation is very big, and this because light source can not regulation voltage, and the handwriting is blurred to cause slide projector when voltage fluctuation, influence artistic effect, perhaps tungsten halogen lamp may be burnt.

The purpose of this utility model is to provide a kind of and has that voltage fluctuation is reported to the police and can be at the secondary secondary voltage dimmer that carries out voltage-regulation of transformer.

The utility model is finished with following mode: the secondary voltage dimmer, it comprises that B level of step-down transformer connects rectification filtering voltage stabilizing circuit, the trigger control circuit that is connected to unijunction transistor BT and resistance capacitance composition at the rectification filtering voltage stabilizing circuit output is exported the control utmost point that meets controllable silicon 3CT, connect the secondary of transformer B behind the controllable silicon 3CT serial connection lamp RL, at the under-voltage and over voltage alarm circuit of rectification filtering voltage stabilizing circuit output termination.Triggering the charging resistor that draws circuit is made of adjustable resistance R2 serial connection R3.Under-voltage and over voltage alarm circuit is that under-voltage sample circuit is made of the common emitter circuit that triode V1 forms by the under-voltage sample circuit overvoltage sample circuit and the integrated regulator IC that are connected to the rectification filtering voltage stabilizing circuit output.The overvoltage sample circuit is made of the common-collector circuit that triode V2 forms, the output of overvoltage and under-voltage sample circuit connects the substrate of inverter triode V3 respectively through isolating diode D5 and D6, output connects switch triode V4 base stage, switch triode V4 collector series relay K is with the normally closed contact guide sound or the optical alarm circuit of relay K.The oscillating circuit that sound or optical alarm circuit are made up of 555 time-base integrated circuits promotes loud speaker and constitutes optical alarm circuit lamp R _LConstitute.

The utility model secondary voltage dimmer adopts at the transformer secondary output regulation voltage and detects voltage fluctuation automatically and report to the police, it has solved the problem that light source that voltage fluctuation causes is not enough or burn bulb, can prolong the life-span of light source bulb, in troupe's performance, can guarantee the artistic effect of slide projector, the personage follows spot for stage, " cutting light " of repeated multiple times can both reach gratifying effect.

Fig. 1 is the utility model circuit theory diagrams.

Fig. 2 is the utility model sound alarm circuit schematic diagram.

Figure below is described in further detail the utility model in conjunction with the accompanying drawings:

As shown in Figure 1, the utility model secondary voltage dimmer be by step-down transformer B time level through second tube sheet D1-D4 bridge rectifier, circuit commutation capacitor C filtering, the direct power supply of output low pressure after the voltage-stabiliser tube D voltage stabilizing.Be connected to the synchronous triggering control circuit that unijunction transistor BT forms at the rectification filtering voltage stabilizing circuit output, this trigger control circuit output connects the control utmost point of controllable silicon 3CT, controllable silicon 3CT serial connection lamp R _LAfter connect the time extreme of transformer B, at bulb R _LTwo ends also meet voltmeter V.The charging resistor of trigger control circuit is composed in series by adjustable resistance R2 and R3, adjusts bulb R with adjustable resistance R2 _LBoth end voltage is i.e. locking behind the setting, regulates controllable silicon 3CT with adjustable resistance R3 and switches bulb R _LGuan Hekai, overcome impulse current to bulb R _LInfluence, the useful life of improving bulb.Overvoltage and undervoltage warning circuit are connected to the rectification filtering voltage stabilizing circuit output.As shown in Figure 1, the common emitter circuit of forming with triode V1 constitutes under-voltage sample circuit, its collection polar circuit of forming with triode V2 constitutes the overvoltage sample circuit, the base stage that isolating diode D5 and D6 meet inverter three plate pipe V3 is passed through in overvoltage and the output of under-voltage sample circuit respectively, output connects the switch triode V4 substrate of executive circuit, with switch triode V4 collector series relay K, close the power supply of serial connection alarm lamp R0 or guide sound warning circuit with the normally closed contact of relay string K.The integrated regulator IC (7812) that is connected to the rectification filtering voltage stabilizing circuit output exports the collector electrode of termination triode V1, V2, V3, V4, provide galvanic current to press, sound alarm circuit as shown in Figure 2, it is to promote loud speaker Y by the oscillating circuit that 555 time-base integrated circuits constitute, and controls the working power of this circuit with the normally closed contact of relay K.When discharging, relay K can send chimes of doom.The operation principle of overvoltage or undervoltage warning is when civil power is under-voltage, the voltage of rectification filtering voltage stabilizing circuit output descends thereupon, at this moment, adjustable resistance R6 partial pressure potential is on the low side, three plate pipe V1 can not get enough base currents and end, and integrated regulator IC output burning voltage, inject base current through resistance R 9 and diode D6 to triode V3, make its saturation conduction, the electronegative potential of V3 collector electrode output makes the V4 triode end again, and relay K discharges, its normally closed contact closure, alarm signal is sent in sound or optical alarm circuit work.When mains supply over-voltage, resistance R 11 partial pressure potential raise, and make the V2 saturation conduction, and V2 emitter output high potential adds to the V4 base stage through D5, makes the V3 saturation conduction equally, and V4 ends, and relay K discharges, its normally closed contact closure, and alarm signal is sent in sound alarm circuit work.When civil power right in the upper and lower bound scope, then V1 conducting, V2 ends.The collector electrode of V1 and the emitter of V2 are all exported electronegative potential, and V3 ends, V4 conducting this moment, and the relay K adhesive, its normally closed contact disconnects, and sound alarm circuit disconnects.This warning circuit can detect mains fluctuations, and sends alarm signal, reminds the operator to adjust, and reaches the purpose of secondary pressure regulation, and proof load can operate as normal.

Claims

1. secondary voltage dimmer, it comprises that B level of step-down transformer connects rectification filtering voltage stabilizing circuit, it is characterized in that the rectification filtering voltage stabilizing circuit output be connected to trigger control circuit output that unijunction transistor BT and resistance capacitance form connect can empty silicon 3CT the control utmost point, controllable silicon 3CT serial connection lamp R _LAfter connect the secondary of transformer B, under-voltage and over voltage alarm circuit in rectification filtering voltage stabilizing circuit output termination.

2. according to the described secondary voltage dimmer of claim 1, the charging resistor that it is characterized in that trigger control circuit is to be made of adjustable resistance R2 serial connection R3.

3. transport the secondary voltage dimmer according to claim 1, it is characterized in that under-voltage and over voltage alarm circuit is by the under-voltage sample circuit that is connected to the rectification filtering voltage stabilizing circuit output, overvoltage sample circuit and integrated regulator IC, under-voltage sample circuit is made of its emitter base diode circuit that three plate pipe V1 form, the overvoltage sample circuit is made of the common-collector circuit that triode V2 forms, from overvoltage with time press sample circuit output to connect the base stage of inverter triode V3 respectively through isolating diode D5 and D6, output connects switch triode V4 base stage, switch triode V4 collector series relay K, with the normally closed contact guide sound or the optical alarm circuit of relay K, integrated regulator IC output meets triode V1, V2, V3, the collector electrode of V4.

4. according to the described secondary voltage dimmer of claim 3, it is characterized in that the oscillating circuit promotion loud speaker that sound or optical alarm circuit are made up of 555 time-base integrated circuits constitutes optical alarm circuit lamp R _oConstitute.