CN205648086U - Novel potentiometre operating circuit of adjusting luminance - Google Patents

Abstract

The utility model discloses a novel potentiometre operating circuit of adjusting luminance is connected with the LED light source, including potentiometre RP1, IC chip, switch SW, connect in the first resistance R1, the second resistance R2 who is connected with 3 feet of IC chip, the switch triode Q1 who is connected with second resistance R2, the third resistance R3 that are connected between 7 feet of IC chip and the switch SW, connect the second diode D2 that is connected in the first diode D1 between third resistance and the potentiometre RP1, with potentiometre RP1, and second electric capacity C2 that potentiometre RP1 connects, the first electric capacity C1 who is connected with 5 feet of IC chip.

Description

A kind of novel potentiometer light modulation operating circuit

Technical field

This utility model relates to light adjusting circuit technical field, particularly to a kind of novel potentiometer light modulation operating circuit.

Background technology

At present, the LED lamp of major part tunable optical on the market, is all the scheme using potentiometer series connection transistor base, by changing the resistance size of potentiometer, control the base current of audion, and then the size of control work branch electric current, thus realize the function (as shown in Figure 2) of light modulation.For above circuit, potentiometer is connected with transistor base, and the big I of resistance of regulator potentiometer changes the base current size of audion so that triode operation is in saturation region or amplification region.But, when LED light source operating current is the biggest, the power consumption of audion is high, and caloric value is big, easily burns out audion.Generally for avoiding the generation of Quality Accident, we have to cost of idleness, increase the quantity in parallel of audion, result in relatively costly.It addition, above circuit low bright time there is also scintillation, and the problem that there will be the change of brightness jump formula in the light modulation of highlighted position.

Therefore, how to realize a kind of simple and reasonable, cost is relatively low, produces heat relatively low, and the visibly homogeneous novel potentiometer light modulation operating circuit of dimming process is technical problem the most urgently to be resolved hurrily.

Utility model content

Main purpose of the present utility model is to provide a kind of novel potentiometer light modulation operating circuit, it is intended to realizing a kind of simple and reasonable, cost is relatively low, produces heat relatively low, the novel potentiometer light modulation operating circuit that dimming process is visibly homogeneous.

The utility model proposes a kind of novel potentiometer light modulation operating circuit, connect and have LED light source, including potentiometer RP1, IC chip, switch SW, it is connected between 7 feet of IC chip and switch SW the first resistance R1 being connected, the the second resistance R2 being connected with 3 feet of IC chip, the switch triode Q1 being connected with the second resistance R2, 3rd resistance R3, the the first diode D1 being connected between the 3rd resistance and potentiometer RP1, the the second diode D2 being connected with potentiometer RP1, the the second electric capacity C2 being connected with described potentiometer RP1, the the first electric capacity C1 being connected with 5 feet of IC chip；When switch SW Guan Bi, electric current is through switch SW, 3rd resistance R3, second electric capacity C2 is charged by potentiometer RP1, 2 feet of IC chip and 6 foot voltages raise, when voltage is raised to certain value, the field effect transistor conducting of IC chip internal, 7 foot electric discharge feet of IC chip are opened, second electric capacity C2, potentiometer RP1, second diode D2, first resistance R1, 7 feet of IC chip form discharge loop, 2 feet of IC chip and the voltage of 6 feet reduce, when voltage drops to certain value, 7 foot electric discharge feet of IC chip are closed, second electric capacity C2 charging is improved 2 feet and the voltage of 6 feet of IC chip by electric current again, so circulation, 3 feet of IC chip then export the square wave of a fixed duty cycle simultaneously, switching tube audion Q1 is promoted constantly to turn on, Guan Bi；By the resistance size of regulator potentiometer RP1, change the resistance size in charge and discharge two loop thus change the time of the second electric capacity C2 charge and discharge, make the square wave of 3 foot output different duty of IC chip, thus change the shutoff of switch triode Q1, ON time, thus control the operating current of work branch LED light source.

Preferably, IC chip uses NE555 chip.

The utility model proposes a kind of novel potentiometer light modulation operating circuit, utilize the operating circuit of the tunable optical of the IC chip collocation composition of potentiometer RP1 Yu NE555, simple and reasonable, cost is relatively low.By the resistance size of regulator potentiometer RP1, change the resistance size in charge and discharge two loop thus change the time of the second electric capacity C2 charge and discharge, make the square wave of 3 foot output different duty of IC chip, thus change the shutoff of switch triode Q1, ON time, thus control the operating current of work branch LED light source.Owing to switch triode Q1 is in constantly shutoff, conducting state, power consumption major part is the switching loss of switch triode Q1, therefore produced heat is relatively low.The operating current of LED light source depends on the dutycycle of switch triode Q1, in the case of the second electric capacity C2 capacity is definite value, dutycycle changes along with the ratio at potentiometer RP1 two ends and changes, therefore the dimming process of circuit is quite uniform, do not have low bright time scintillation and the problem of brightness jump formula change that occurs in the light modulation of highlighted position.This utility model achieves a kind of simple and reasonable, and cost is relatively low, produces heat relatively low, the novel potentiometer light modulation operating circuit that dimming process is visibly homogeneous.

Accompanying drawing explanation

Fig. 1 is the electric circuit construction schematic diagram of an embodiment of a kind of novel potentiometer light modulation operating circuit of this utility model；

Fig. 2 is the electric circuit construction schematic diagram of existing potentiometer light adjusting circuit.

The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.

Detailed description of the invention

Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.

With reference to Fig. 1, one embodiment of a kind of novel potentiometer light modulation operating circuit of the present utility model is proposed, connect and have LED light source, including potentiometer RP1, IC chip, switch SW, it is connected between 7 feet of IC chip and switch SW the first resistance R1 being connected, the the second resistance R2 being connected with 3 feet of IC chip, the switch triode Q1 being connected with the second resistance R2, 3rd resistance R3, the the first diode D1 being connected between the 3rd resistance and potentiometer RP1, the the second diode D2 being connected with potentiometer RP1, the the second electric capacity C2 being connected with described potentiometer RP1, the the first electric capacity C1 being connected with 5 feet of IC chip.

Wherein, IC chip can use NE555 chip.

When switch SW Guan Bi, electric current is through switch SW, 3rd resistance R3, second electric capacity C2 is charged by potentiometer RP1, 2 feet of IC chip and 6 foot voltages raise, when voltage is raised to certain value, the field effect transistor conducting of IC chip internal, 7 foot electric discharge feet of IC chip are opened, second electric capacity C2, potentiometer RP1, second diode D2, first resistance R1, 7 feet of IC chip form discharge loop, 2 feet of IC chip and the voltage of 6 feet reduce, when voltage drops to certain value, 7 foot electric discharge feet of IC chip are closed, second electric capacity C2 charging is improved 2 feet and the voltage of 6 feet of IC chip by electric current again, so circulation, 3 feet of IC chip then export the square wave of a fixed duty cycle simultaneously, switching tube audion Q1 is promoted constantly to turn on, Guan Bi.

By the resistance size of regulator potentiometer RP1, change the resistance size in charge and discharge two loop thus change the time of the second electric capacity C2 charge and discharge, make the square wave of 3 foot output different duty of IC chip, thus change the shutoff of switch triode Q1, ON time, thus control the operating current of work branch LED light source.

Owing to switch triode Q1 is in constantly shutoff, conducting state, power consumption major part is the switching loss of switch triode Q1, therefore produced heat is relatively low.The operating current of LED light source depends on the dutycycle of switch triode Q1, in the case of the second electric capacity C2 capacity is definite value, dutycycle changes along with the ratio at potentiometer RP1 two ends and changes, therefore the dimming process of circuit is quite uniform, do not have low bright time scintillation and the problem of brightness jump formula change that occurs in the light modulation of highlighted position.

At present, the LED lamp of major part tunable optical on the market, is all the scheme using potentiometer series connection transistor base, by changing the resistance size of potentiometer, control the base current of audion, and then the size of control work branch electric current, thus realize the function (as shown in Figure 2) of light modulation.For above circuit, potentiometer is connected with transistor base, and the big I of resistance of regulator potentiometer changes the base current size of audion so that triode operation is in saturation region or amplification region.But, when LED light source operating current is the biggest, the power consumption of audion is high, and caloric value is big, easily burns out audion.Generally for avoiding the generation of Quality Accident, we have to cost of idleness, increase the quantity in parallel of audion, result in relatively costly.It addition, above circuit low bright time there is also scintillation, and the problem that there will be the change of brightness jump formula in the light modulation of highlighted position.And the utility model proposes a kind of novel potentiometer light modulation operating circuit, and utilize the operating circuit of the tunable optical of the IC chip collocation composition of potentiometer RP1 Yu NE555, simple and reasonable, cost is relatively low.By the resistance size of regulator potentiometer RP1, change the resistance size in charge and discharge two loop thus change the time of the second electric capacity C2 charge and discharge, make the square wave of 3 foot output different duty of IC chip, thus change the shutoff of switch triode Q1, ON time, thus control the operating current of work branch LED light source.Owing to switch triode Q1 is in constantly shutoff, conducting state, power consumption major part is the switching loss of switch triode Q1, therefore produced heat is relatively low.The operating current of LED light source depends on the dutycycle of switch triode Q1, in the case of the second electric capacity C2 capacity is definite value, dutycycle changes along with the ratio at potentiometer RP1 two ends and changes, therefore the dimming process of circuit is quite uniform, do not have low bright time scintillation and the problem of brightness jump formula change that occurs in the light modulation of highlighted position.This utility model achieves a kind of simple and reasonable, and cost is relatively low, produces heat relatively low, the novel potentiometer light modulation operating circuit that dimming process is visibly homogeneous.

The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing this utility model description and accompanying drawing content to be made; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in scope of patent protection of the present utility model.

Claims (2)

1. a novel potentiometer light modulation operating circuit, it is characterized in that, connect and have LED light source, including potentiometer RP1, IC chip, switch SW, it is connected between 7 feet of IC chip and switch SW the first resistance R1 being connected, the the second resistance R2 being connected with 3 feet of IC chip, the switch triode Q1 being connected with the second resistance R2, 3rd resistance R3, the the first diode D1 being connected between the 3rd resistance and potentiometer RP1, the the second diode D2 being connected with potentiometer RP1, the the second electric capacity C2 being connected with described potentiometer RP1, the the first electric capacity C1 being connected with 5 feet of IC chip；

When switch SW Guan Bi, electric current is through switch SW, 3rd resistance R3, second electric capacity C2 is charged by potentiometer RP1, 2 feet of IC chip and 6 foot voltages raise, when voltage is raised to certain value, the field effect transistor conducting of IC chip internal, 7 foot electric discharge feet of IC chip are opened, second electric capacity C2, potentiometer RP1, second diode D2, first resistance R1, 7 feet of IC chip form discharge loop, 2 feet of IC chip and the voltage of 6 feet reduce, when voltage drops to certain value, 7 foot electric discharge feet of IC chip are closed, second electric capacity C2 charging is improved 2 feet and the voltage of 6 feet of IC chip by electric current again, so circulation, 3 feet of IC chip then export the square wave of a fixed duty cycle simultaneously, switching tube audion Q1 is promoted constantly to turn on, Guan Bi；

By the resistance size of regulator potentiometer RP1, change the resistance size in charge and discharge two loop thus change the time of the second electric capacity C2 charge and discharge, make the square wave of 3 foot output different duty of IC chip, thus change the shutoff of switch triode Q1, ON time, thus control the operating current of work branch LED light source.

A kind of novel potentiometer light modulation operating circuit the most according to claim 1, it is characterised in that IC chip uses NE555 chip.