CN203435199U - A kind of LED lamp ballasted by bidirectional thyristor - Google Patents

Abstract

The utility model discloses a LED lamp with bidirectional thyristor ballasting, including thermal induction unit, power conditioning unit, direct current LED lamp plate and bridge rectifier, thermal induction unit and bridge rectifier, direct current LED lamp plate electric connection in proper order, power conditioning unit electric connection power and bridge rectifier. The thermal sensing unit comprises a thermistor and a current limiting resistor, and the thermistor is coupled with the current limiting resistor. The utility model discloses utilized phase coupling's thermistor and current-limiting resistor, made the change of current-limiting resistor at circular telegram in-process electric current, and the thermal size of production influences thermistor's impedance's size, then this thermistor impedance's size is to power adjusting unit's in the circuit influence, makes the power of circuit adjust to reach the effect of adjusting LED lamp luminance or ballast.

Description

A kind of LED lamp ballasted by bidirectional thyristor

technical field

The utility model relates to the field of LED lamps, in particular to an LED lamp ballasted by a bidirectional thyristor.

Background technique

Lamps made of LEDs have the advantages of low power consumption, low heat generation, and long service life, and have been widely used in various fields. Because the drive circuit of the traditional LED tube or light bulb uses electrolytic capacitors and active components, although the efficiency and output current are stable, the life of the existing LED drive circuit is far less than that of the LED lamp. Often the LED lamp has not been damaged, and the drive circuit has Die early. In order to prolong the life of the LED lamp, the life of the driving circuit needs to be strengthened.

Utility model content

The technical problem to be solved by this utility model is to provide a bidirectional thyristor ballasted LED lamp that can match the life of the LED in view of the above-mentioned deficiencies in the prior art.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a kind of LED lamp ballasted by bidirectional thyristor, including a thermal induction unit, a power adjustment unit, a DC LED lamp board and a bridge rectifier, and a thermal induction unit It is electrically connected with the bridge rectifier and the DC LED light board in turn, and the power adjustment unit is electrically connected with the power supply and the bridge rectifier.

In the above technical solution, the thermal sensing unit includes a thermistor and a current limiting resistor, and the thermistor and the current limiting resistor are coupled.

In the above technical solution, the thermistor is pasted on the current-limiting resistor through a heat-conducting adhesive; or the thermistor is a chip-type thermistor, the current-limiting resistor is a chip-type current-limiting resistor, and the chip-type thermistor Solder the SMD current limiting resistors on adjacent pads.

In the above technical solution, the thermistor is a negative temperature coefficient thermistor.

In the above technical solution, the power adjustment unit includes a non-polar capacitor, a resistor, a bidirectional trigger diode and a bidirectional thyristor.

An LED lamp ballasted by a bidirectional thyristor, including a thermal induction unit, a power adjustment unit and an AC LED lamp board, the thermal induction unit is electrically connected to the AC LED lamp board, and the power adjustment unit is electrically connected to the power supply and the AC LED lamp plate.

In the above technical solution, the thermal sensing unit includes a thermistor and a current limiting resistor, and the thermistor and the current limiting resistor are coupled.

In the above technical solution, the thermistor is pasted on the current-limiting resistor through a heat-conducting adhesive; or the thermistor is a chip-type thermistor, the current-limiting resistor is a chip-type current-limiting resistor, and the chip-type thermistor Solder the SMD current limiting resistors on adjacent pads.

In the above technical solution, the thermistor is a negative temperature coefficient thermistor.

In the above technical solution, the power adjustment unit includes a non-polar capacitor, a resistor, a bidirectional trigger diode and a bidirectional thyristor. the

The beneficial effects of the utility model are: the coupled thermistor and current-limiting resistor are mainly used, so that the current of the current-limiting resistor changes during the electrification process, and the size of the heat generated affects the impedance of the thermistor , and then the resistance of the thermistor affects the power adjustment unit in the circuit, so that the power of the circuit can be adjusted, and the effect of adjusting the brightness or ballast of the LED lamp can be achieved. The structure of the utility model is simplified, without using electrolytic capacitors, inductors, transformers and chips, so the failure rate is far lower than that of LED lamps using traditional switch drive circuits, achieving no radio frequency interference, high brightness, small operating current, simplified structure, low The advantages of low cost, high circuit reliability and good overall benefit. the

Description of drawings

Fig. 1 is the circuit diagram of the first embodiment of the utility model;

Fig. 2 is a schematic circuit diagram of the second embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The first embodiment, as shown in Figure 1, is an LED lamp ballasted by a bidirectional thyristor, including a thermal induction unit 1, a power adjustment unit 4, a bridge rectifier 2 and a DC LED lamp board 3, and the thermal induction unit 1 It is connected in series with the bridge rectifier 2 and the DC LED lamp board 3 , and the power adjustment unit 4 is connected to the power supply and the bridge rectifier 2 . Among them, the thermal sensing unit 1 is formed by coupling the negative temperature coefficient thermistor NTC and the current limiting resistance Ra, and the power adjustment unit 4 is formed by connecting the non-polar capacitor Cb, the resistor Rb, the bidirectional trigger diode DIAC and the bidirectional thyristor TRIAC , the bridge rectifier 2 is formed by connecting diodes D1, D2, D3, and D4, and the DC LED lamp panel 3 is composed of a number of light-emitting diode groups connected in series and then connected in parallel. Its circuit connection relationship is as follows: one end of the power supply, the non-polar capacitor Ca is connected in series with the negative temperature coefficient thermistor NTC, and the non-polar capacitor Ca and the two ends of the negative temperature coefficient thermistor NTC are connected with the power adjustment unit 4 The non-polar capacitor Cb is connected in parallel; the non-polar capacitor Cb is connected in parallel with the bidirectional trigger diode DIAC, the resistor Rb is connected in parallel with the bidirectional thyristor TRIAC and then connected in parallel with the bidirectional trigger diode DIAC; The nodes between the TRIACs are connected, and the bridge rectifier 2 is also connected in series with the current limiting resistor Ra and then connected to the other end of the power supply; the other two ends of the bridge rectifier 2 are connected to the DC LED lamp board 3 . In the thermal sensing unit 1, the negative temperature coefficient thermistor NTC is pasted on the current-limiting resistor Ra with heat-conducting adhesive, or the chip-type negative temperature coefficient thermistor NTC and the chip-type current-limiting resistor Ra are pasted together. Solder on pads adjacent to each other. When the power is turned on, the current of the bridge rectifier 2 and the DC LED lamp board 3 passes through the thermal induction unit 1 composed of the current limiting resistor Ra and the negative temperature coefficient thermistor NTC. The higher the heat, the smaller the impedance of the negative temperature coefficient thermistor NTC close to the current limiting resistor Ra, the nonpolar capacitor Ca connected to the negative temperature coefficient thermistor NTC, and the nonpolarity in the power adjustment unit 4 The charging and discharging time of RC composed of capacitor Cb and resistor Rb becomes longer, and the phase triggered by hysteresis bidirectional trigger diode DIAC to bidirectional thyristor TRIAC can automatically increase or decrease the power of the entire LED lamp ballasted by bidirectional thyristor, so as to Stabilize the brightness or achieve the purpose of ballasting the DC LED lamp board 3 .

The second embodiment, as shown in Figure 2, is an LED lamp ballasted by a bidirectional thyristor, including a thermal induction unit 1, a power adjustment unit 4, and an AC LED lamp board 5, and the thermal induction unit 1 and the AC LED lamp board 5 are connected in series, and the power adjustment unit 4 is connected to the power supply. Among them, the thermal sensing unit 1 is formed by coupling the negative temperature coefficient thermistor NTC and the current limiting resistance Ra, and the power adjustment unit 4 is formed by connecting the non-polar capacitor Cb, the resistor Rb, the bidirectional trigger diode DIAC and the bidirectional thyristor TRIAC , the AC LED lamp panel 5 is composed of several groups of two light-emitting diodes connected in parallel and then connected in parallel again. One end of the power supply, the non-polar capacitor Ca is connected in series with the negative temperature coefficient thermistor NTC, and the non-polar capacitor Ca and the two ends of the negative temperature coefficient thermistor NTC are connected in parallel with the non-polar capacitor Cb in the power adjustment unit 4; The nonpolar capacitor Cb is connected in parallel with the bidirectional trigger diode DIAC, and the resistor Rb is connected in series with the bidirectional thyristor TRIAC and then connected in parallel with the bidirectional trigger diode DIAC; the other extreme of the power supply, the current limiting resistor Ra, is connected in series with the AC LED lamp board 5 And connected to the node between the resistor Rb and the bidirectional thyristor TRIAC. In the thermal sensing unit 1, the negative temperature coefficient thermistor NTC is pasted on the current-limiting resistor Ra with heat-conducting adhesive, or the chip-type negative temperature coefficient thermistor NTC and the chip-type current-limiting resistor Ra are pasted together. Solder on pads adjacent to each other. When the power is turned on, the current of the bridge rectifier 2 and the DC LED lamp board 3 passes through the thermal induction unit 1 composed of the current limiting resistor Ra and the negative temperature coefficient thermistor NTC. The higher the heat, the smaller the impedance of the negative temperature coefficient thermistor NTC close to the current limiting resistor Ra, the nonpolar capacitor Ca connected in series with the negative temperature coefficient thermistor NTC, and the nonpolar capacitor Ca in the power adjustment unit 4 The charging and discharging time of the RC composed of the memory capacitor Cb and the resistor Rb becomes longer, and the phase triggered by the hysteresis bidirectional trigger diode DIAC to the bidirectional thyristor TRIAC can automatically increase or decrease the power of the entire LED lamp ballasted by the bidirectional thyristor. To stabilize the brightness or achieve the purpose of ballasting the AC LED lamp board 5 .

The working principle of this kind of LED lamp ballasted by bidirectional thyristor is as follows: after the power is turned on, the greater the current passing through the current limiting resistor Ra, the higher the heat generated, making the resistance of the negative temperature coefficient thermistor NTC becomes smaller, because the non-polar capacitor Ca connected to the negative temperature coefficient thermistor NTC is connected in parallel with the non-polar capacitor Cb in the power adjustment unit 4, so the negative temperature coefficient thermistor NTC, the non-polar capacitor Ca and the non-polar capacitor Cb The total capacitance of the capacitor becomes larger, so that the charging and discharging time of the RC formed by the total capacitance and the resistor Rb becomes longer, and the hysteresis of the phase triggered by the bidirectional trigger diode DIAC to the bidirectional thyristor TRIAC reduces the power of the whole lamp; when the whole lamp When the power of the current-limiting resistor Ra is reduced, the current through the current-limiting resistor Ra becomes smaller, and the heat generated becomes less, so that the impedance of the negative temperature coefficient thermistor NTC becomes larger, because the non-polar capacitor Ca connected to the negative temperature coefficient thermistor NTC, and The nonpolar capacitor Cb in the power adjustment unit 4 is connected in parallel, so the total capacitance of the negative temperature coefficient thermistor NTC, the nonpolar capacitor Ca and the nonpolar capacitor Cb becomes smaller, and the RC formed by the total capacitance and the resistor Rb is charged. The discharge time is shortened, and the phase triggered by the two-way trigger diode DIAC and the two-way thyristor TRIAC is moved forward, so that the power of the whole lamp is increased, and the above actions are repeated; so as to automatically increase or decrease the power of the whole lamp to stabilize the brightness or to ( DC or AC) LED light board achieves the purpose of ballast.

The above-mentioned power supply can be commercial power, that is to say, the LED lamp ballasted by bidirectional thyristor can be directly connected to 220V commercial power.

Because the structure of the utility model is simplified and does not use electrolytic capacitors, inductors, transformers and chips, the failure rate is far lower than that of LED lamps using traditional switch drive circuits, achieving no radio frequency interference, high brightness, low operating current, low cost, It has the advantages of high circuit reliability and good overall effect.

The above embodiments are only intended to illustrate rather than limit the utility model, so all equivalent changes or modifications made according to the method described in the scope of the patent application of the utility model are included in the scope of the patent application of the utility model.

Claims (10)

1. A LED lamp ballasted with bidirectional thyristor, characterized in that: it comprises a thermal induction unit, a power adjustment unit, a DC LED lamp board and a bridge rectifier, and the thermal induction unit and the bridge rectifier, the DC LED lamp The boards are electrically connected in turn, and the power adjustment unit is electrically connected to the power supply and the bridge rectifier. 2. An LED lamp ballasted by a bidirectional thyristor according to claim 1, wherein the thermal sensing unit includes a thermistor and a current-limiting resistor, and the thermistor and the current-limiting resistor are in phase with each other. coupling. 3. An LED lamp ballasted by a bidirectional thyristor according to claim 2, characterized in that: the thermistor is pasted on the current-limiting resistor through a heat-conducting adhesive; or the thermistor It is a chip-type thermistor, the current-limiting resistor is a chip-type current-limiting resistor, and the chip-type thermistor and the chip-type current-limiting resistor are welded on pads adjacent to each other. 4 . The LED lamp ballasted by bidirectional thyristor according to claim 3 , wherein the thermistor is a negative temperature coefficient thermistor. 5 . The LED lamp ballasted by bidirectional thyristor according to claim 1 , wherein the power adjustment unit includes a non-polar capacitor, a resistor, a bidirectional trigger diode and a bidirectional thyristor. 6. An LED lamp ballasted by a bidirectional thyristor, characterized in that it includes a thermal induction unit, a power adjustment unit and an AC LED lamp board, the thermal induction unit is electrically connected to the AC LED lamp board, and the power The adjustment unit is electrically connected to the power supply and the AC LED light board. 7. An LED lamp ballasted by a bidirectional thyristor according to claim 6, wherein the thermal sensing unit includes a thermistor and a current-limiting resistor, and the thermistor and the current-limiting resistor are in phase with each other. coupling. 8. The LED lamp ballasted by triac according to claim 7, characterized in that: the thermistor is pasted on the current-limiting resistor with a heat-conducting adhesive; or the thermistor It is a chip-type thermistor, the current-limiting resistor is a chip-type current-limiting resistor, and the chip-type thermistor and the chip-type current-limiting resistor are welded on pads adjacent to each other. 9 . The LED lamp ballasted by bidirectional thyristor according to claim 8 , wherein the thermistor is a negative temperature coefficient thermistor. 10 . The LED lamp ballasted by bidirectional thyristor according to claim 6 , wherein the power adjustment unit comprises a non-polar capacitor, a resistor, a bidirectional trigger diode and a bidirectional thyristor. 11 .

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