JP3185138U - Driving circuit - Google Patents

Abstract

A drive circuit for a series-arranged LED light-emitting device with stable output is provided.
An AC input rectification unit 30 and an intelligent control IC 40 are provided. The AC input rectification unit 30 is connected to the AC power supply 20 at the input end, thereby converting the AC voltage into a DC voltage and outputting it. The intelligent control IC 40 includes an operating voltage control unit 41, a microcontroller 42, a dimming control unit 43, a current setting unit 44, an EMI control unit 45, a light source module 50, and a plurality of switching units 46. The intelligent control IC has a voltage detection circuit, and when the input voltage is higher than the set activation voltage of the LED groups arranged in series, the output of the light source module is activated by activating the corresponding constant current control drive circuit switch. , Control lumen value and output coefficient, and stabilize the output of LED light source.
[Selection] Figure 2

Description

  The present invention relates to a drive circuit, and more particularly to a drive circuit for a light emitting device.

  With the aging of LED epitaxy and packaging technology, LEDs have become the mainstream of energy-saving lighting devices because they are applied in the lighting area, and have advantages such as being able to cope with energy saving and ecology, and having a long life.

  Lighting devices using LEDs as light sources have been developed from general spherical lamps to tubular lamps, street lamps, and built-in lamps for ceilings or steel frames. In contrast to a spherical lamp using one or a plurality of LEDs, the above-described lamp uses several tens of LEDs arranged in series, so that the driving circuit is arranged in series unlike a driving circuit of a general LED lamp. It is necessary to consider the stability of the current flowing through the LEDs in the LED group.

  As shown in FIG. 1, the LED drive circuit described in Patent Document 1 includes a bridge rectifier 12 connected to an AC power source 11 in a conventional LED group drive circuit 10. The transformer 13 has a first primary winding 131, a second primary winding 132, and a secondary winding 133. The first primary winding 131 has one end connected to the bridge rectifier 12 and the other end connected to the switch 14. One end of the second primary winding 132 is grounded, and the other end generates a cell current detection signal ZCD. The secondary winding 133 has a first end connected to the LED group 15. The feedback circuit 16 has a first input terminal 161 connected to the second end of the secondary winding 133, a second input end 162 connected to the first end of the secondary winding 133, and the secondary circuit A feedback signal VFB is generated based on the input current at the second end of the winding 133 and the input voltage at the first end of the secondary winding 133. Since the switch 14 is controlled based on the inverter system, the LED groups 15 arranged in series can be operated with a constant current. The control circuit 17 controls the output factor (power factor) of the LED groups 15 arranged in series.

  On the other hand, the conventional exchangeable LED driving circuit needs to use a magnetic unit such as a transformer and an inductance. Since these magnetic units affect the operation of driving the LED groups 15 arranged in series, there is room for improvement.

  On the other hand, since conventional LED groups arranged in series are generally arranged on an elongated circuit board, the conventional replaceable LED driving circuit is the result of LEDs and LEDs arranged on one side of the elongated circuit board. Affects brightness uniformity.

Taiwan Utility Model M435796 Specification

  The main object of the present invention is to provide a drive circuit that is small in size and stable in output.

In order to achieve the above object, the technical means of the present invention includes an AC input rectification unit and an intelligent control IC.
The AC input rectification unit has an input terminal connected to an AC power supply, converts an AC voltage into a DC voltage, and outputs a DC voltage.

  The intelligent control IC includes an operating voltage control unit, a microcontroller, a dimming control unit, a current setting unit, an EMI control unit, a light source module, and a plurality of switching units (SW1 to SWn).

  The operating voltage control unit has a first end connected to the AC input rectification unit by a first passive unit and a second end grounded by the second passive unit. The microcontroller is connected to the operating voltage control unit. The dimming control unit is connected between the AC input rectification unit, the microcontroller, and the voltage detection control unit. The current setting unit is connected to the microcontroller. The EMI suppression unit has one end connected to the output end of the AC input rectification unit by a third passive unit and the other end connected to the microcontroller. The light source module is composed of a plurality of LEDs connected in series, and has a plurality of LED groups. The light source module has a current input terminal connected to an output terminal of the AC input rectification unit. The plurality of switching units (SW1 to SWn) have switches corresponding to the LED groups. One end of the switch is connected to the microcontroller, and the other end is connected to the current output terminal of the corresponding LED group.

An intelligent control IC composed of an operating voltage control unit, a microcontroller, a dimming control unit, a current setting unit, an EMI control unit, and a switching unit (SW1 to SWn) depends on the input terminal of the switching unit (SW1 to SWn). The light source modules are divided into a plurality of LED groups.
When the DC voltage is higher than the predetermined voltage of the first LED group, the first switch (SW1) of the switching unit (SW1 to SWn) is turned on, and the first LED group emits light. When the DC voltage is higher than the predetermined voltage of the first LED group and the second LED group, the second switch (SW2) of the switching unit (SW1 to SWn) is turned on, and the first LED group and the second LED group emit light. When the switching units (SW1 to SWn) are conducted, the output, lumen value, and output coefficient of the light source module are controlled.

  In the present invention, since the voltage detection circuit of the intelligent control IC is adopted, when the input voltage is higher than the activation voltage of the LED groups arranged in series, the intelligent control IC activates the switch of the corresponding constant current control drive circuit to activate the light source. The module output, lumen value and output coefficient can be controlled to stabilize the output of the LED light source. On the other hand, in the present invention, it is not necessary to use a magnetic unit such as a transformer or inductance, and the thickness and volume are relatively small. Can be improved.

The intelligent control IC has a voltage detection circuit. When the input voltage is higher than the set start voltage of the LED groups arranged in series, the intelligent control IC activates the switch of the constant current control drive circuit corresponding to the input voltage, the lumen value and the output coefficient. It is possible to control and stabilize the output of the LED light source.
The present invention is low in cost, has high reliability and power factor, and can overcome electromagnetic interference (EMI). The present invention can be equipped with a TRIAC dimmer, and can use a plurality of intelligent control ICs connected in parallel, or can use a coupling method in which switch control terminals are combined.

It is a schematic diagram which shows the conventional LED drive circuit. 1 is a schematic diagram illustrating a driving circuit according to an embodiment of the present invention. 1 is a circuit diagram illustrating a driving circuit according to an embodiment of the present invention. It is a schematic diagram which shows the processing process of the drive circuit by one Embodiment of this invention. FIG. 6 is a characteristic diagram illustrating a current of a driving circuit according to an embodiment of the present invention. It is a schematic diagram which shows the modification of the drive circuit by one Embodiment of this invention. It is a schematic diagram which shows the modification of the drive circuit by one Embodiment of this invention. It is a schematic diagram which shows the application example of the drive circuit by one Embodiment of this invention. It is a schematic diagram which shows the application example of the drive circuit by one Embodiment of this invention. It is a schematic diagram which shows other embodiment of this invention.

Hereinafter, a driving circuit according to an embodiment of the present invention will be described with reference to the drawings.
(One embodiment)
A driving circuit according to an embodiment of the present invention is shown in FIGS.
As shown in FIGS. 2 to 5, the driving circuit according to an embodiment of the present invention includes an AC input rectification unit 30 and an intelligent control IC 40. The AC input rectification unit 30 converts the AC voltage 21 to the DC voltage 34 by connecting the input terminal to the AC power supply 20, and outputs the DC voltage 34. In the present embodiment, the AC input rectification unit 30 includes a bridge rectifier 33, a surge absorber 31, and a capacitor filter 32. Surge absorber 31 and capacitor filter 32 are connected in parallel between AC power supply 20 and bridge rectifier 33.

  The intelligent control IC 40 includes an operating voltage control unit 41, a microcontroller 42, a dimming control unit 43, a current setting unit 44, an EMI control unit 45, a light source module 50, and a plurality of switching units 46. The operating voltage control unit 41 has a first end connected to the AC input rectification unit 30 by the first passive unit 411 and a second end grounded by the second passive unit 412.

  The microcontroller 42 is connected to the operating voltage control unit 41, and outputs the DC full-wave voltage signal VLED + with a constant current by controlling the operating voltage control unit 41.

The dimming control unit 43 is connected between the AC input rectification unit 30, the microcontroller 42, and the voltage detection control unit 41. The dimming control unit 43 includes a dimmer (TRIAC), and one end thereof is connected to the fourth passive unit 431. In the present embodiment, the dimming control unit 43 includes a conventional dimmer (TRIAC). Since the intelligent control IC 40 also has such a function, the usage method is the same as the conventional method.
The current setting unit 44 is connected to the microcontroller 42 and grounded by the fifth passive unit 441.

  The EMI suppression unit 45 has one end connected to the output end of the AC input rectification unit 30 by the third passive unit 451 and the other end connected to the microcontroller 42. The EMI suppression unit 45 includes a soft start circuit.

  The light source module 50 is configured by connecting a plurality of LEDs in series, and is divided into a plurality of LED groups (L1 to Ln). The light source module 50 has a current input terminal connected to an output terminal of the DC voltage 34.

  The plurality of switching units 46 have switches (SW1 to SWn) corresponding to the LED groups (L1 to Ln). One end of the switch (SW1 to SWn) is connected to the microcontroller 42, and the other end is connected to the current output terminal of the corresponding LED group (L1 to Ln). The switching unit 46 is composed of any one of a MOS transistor, an organic transistor, and a molecular transistor.

  As shown in FIG. 4 and FIG. 5, intelligent control comprising an operating voltage control unit 41, a microcontroller 42, a dimming control unit 43, a current setting unit 44, an EMI control unit 45 and a switching unit 46 (SW1 to SWn). The IC 40 divides the light source module 50 into a plurality of LED groups (L1 to Ln) by the input terminal of the switching unit 46 (SW1 to SWn) and controls it. When the DC voltage 34 is higher than the set threshold voltage of the first LED group L1, the corresponding first switch (SW1) in the switching unit 46 (SW1 to SWn) is turned on and emits the first LED group L1. And output a current based on the setting. When the DC voltage 34 is higher than the set threshold voltage of the first LED group L1 and the second LED group L2, the corresponding second switch (SW2) of the switching units 46 (SW1 to SWn) becomes conductive, and the first One LED group L1 and second LED group L2 are caused to emit light, and current is output based on the setting. The output, lumen value, and output coefficient of the light source module 50 are controlled by conducting the switching unit 46 (SW1 to SWn) through the above-described process.

  In the present embodiment, the first passive unit 411, the third passive unit 451, the fourth passive unit 431, and the fifth passive unit 441 are configured by resistors, and the second passive unit 412 is configured by a capacitor, but this is not limitative. Absent. A passive unit with the same effect may be adopted.

  The microcontroller 42 is further connected to the protection unit 47. The protection unit 47 includes any one protection circuit or a plurality of protection circuits among an overvoltage protection circuit, an overcurrent protection circuit, and an overheat protection circuit. When the voltage, current or temperature is too high, the protection unit 47 cuts off the power input and ensures safety during use.

(Modification)
As shown in FIGS. 6A and 6B, in a modification of the present invention, a plurality of intelligent control ICs 40 can be connected in parallel or the switch control terminals can be used together.

  As shown in FIG. 7A, the AC input rectification unit 30, the intelligent control IC 40, and the light source module 50 are mounted on a circuit board 60. The circuit board 60 has an elongated shape or a plate shape, and constitutes an illumination tubular or plate light source module. As shown in FIG. 7B, since the circuit board 60 on which the above-described unit is mounted has a small thickness and volume, the stool can be installed in the tubular lamp or in the lamp holder.

      (Other embodiments)

As shown in FIG. 8, another embodiment of the present invention automatically switches to another high voltage structure when detecting that the input voltage is high by the voltage detection controller 70 mounted on the circuit board 60, The present invention can satisfy different input structures for the two voltage power supplies.
As mentioned above, this invention is not limited to the said embodiment at all, In the range which does not deviate from the meaning of invention, it can be implemented with a various form.

20: AC power supply,
21: AC voltage,
30: AC input rectification unit,
31: Surge absorber,
32: Capacitor filter,
33: Bridge rectifier,
34: DC voltage,
40: Intelligent control IC,
41: Working voltage control unit,
411: first passive unit,
412: second passive unit,
42: Microcontroller,
43: Dimming control unit,
431: Fourth passive unit,
44: Current setting unit,
441: the fifth passive unit,
45: EMI suppression unit,
451: the third passive unit,
46: Switching unit,
47: Protection unit,
50: Light source module,
L1-Ln: LED group,
SW1 to SWn: switch,
60: circuit board,
70: Voltage detection controller.

Claims (10)

AC input rectification unit, operating voltage control unit, microcontroller, dimming control unit, current setting unit, EMI control unit, light source module, and a plurality of switching units (SW1 to SWn),
The AC input rectification unit has an input terminal connected to an AC power supply, converts an AC voltage into a DC voltage, and outputs a DC voltage.
The operating voltage control unit has a first end connected to the AC input rectification unit by a first passive unit and a second end grounded by a second passive unit;
The microcontroller is connected to the operating voltage control unit;
The dimming control unit is connected between the AC input rectification unit, the microcontroller, and a voltage detection control unit;
The current setting unit is connected to the microcontroller;
The EMI suppression unit has one end connected to the output end of the AC input rectification unit by a third passive unit and the other end connected to the microcontroller.
The light source module is composed of a plurality of LEDs connected in series, has a plurality of LED groups, and a current input end is connected to an output end of the AC input rectification unit,
The plurality of switching units (SW1 to SWn) have a switch corresponding to the LED group, one end of the switch is connected to the microcontroller, and the other end of the switch corresponds to the current of the LED group Connected to the output end,
The operating voltage control unit, the microcontroller, the dimming control unit, the current setting unit, the EMI control unit, and the switching unit (SW1 to SWn) constitute an intelligent control IC, and the switching unit (SW1 To SWn), the light source modules are divided into a plurality of the LED groups,
When the DC voltage is higher than the predetermined voltage of the first LED group, the first switch (SW1) of the switching unit (SW1 to SWn) is turned on, the first LED group emits light,
When the DC voltage is higher than the predetermined voltage of the first LED group and the second LED group, the second switch (SW2) of the switching unit (SW1 to SWn) is turned on, and the first LED group and the second LED group are Flash
A drive circuit that controls the output, lumen value, and output coefficient of the light source module when the switching units (SW1 to SWn) are turned on. The AC input rectification unit includes a bridge rectifier, a surge absorber, and a capacitor filter,
The drive circuit according to claim 1, wherein the surge absorber and the capacitor filter are connected in parallel between the AC power supply and the bridge rectifier.   The drive circuit according to claim 1, wherein the dimming control unit includes a dimmer (TRIAC), and one end thereof is connected to the fourth passive unit.   The drive circuit according to claim 3, wherein the current setting unit is grounded by a fifth passive unit. The first passive unit, the third passive unit, the fourth passive unit and the fifth passive unit are composed of resistors,
The drive circuit according to claim 4, wherein the second passive unit includes a capacitor.   The drive circuit according to claim 1, wherein the EMI suppression unit includes a soft start circuit.   2. The drive circuit according to claim 1, wherein the switching unit includes any one of a MOS transistor, an organic transistor, and a molecular transistor. The microcontroller is further connected to a protection unit;
The drive circuit according to claim 1, wherein the protection unit includes at least one protection circuit among an overvoltage protection circuit, an overcurrent protection circuit, and an overheat protection circuit.   The drive circuit according to claim 1, wherein a plurality of the intelligent control ICs are connected in parallel, or the output terminals of the switching unit can be used together. The AC input rectification unit, the intelligent control IC, and the light source module are mounted on a circuit board,
The drive circuit according to claim 1, wherein the circuit board has an elongated shape or a plate shape and has a voltage detection controller.

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