CN105188211A - Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output - Google Patents
Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output Download PDFInfo
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- CN105188211A CN105188211A CN201510557016.7A CN201510557016A CN105188211A CN 105188211 A CN105188211 A CN 105188211A CN 201510557016 A CN201510557016 A CN 201510557016A CN 105188211 A CN105188211 A CN 105188211A
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Abstract
The invention provides a light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output. The LED circuit comprises an input end, LED load, a constant-current controller and at least one power controller, wherein the input end is used for receiving external power supply; the LED load is electrically connected with the input end; the constant-current controller is connected with the LED load in series for providing constant current to the LED load; each power controller comprises a control unit and a power adjusting module; each power adjusting module is electrically connected with the constant-current controller; each control unit is electrically connected with the input end and each power adjusting module; and each control unit controls each power adjusting module to switch in or out according to the voltage of the external power supply received by the input end.
Description
Technical field
The present invention relates to field of LED drive, and in particular to the LED circuit of a kind of compatible low pressure and high input voltage constant power output.
Background technology
LED illumination is widely used in enterprise's illumination, business application illumination and residential lighting.Compare with electricity-saving lamp with incandescent lamp, LED can save more electric power, and useful life is also long, and to the pollution of the environment also advantage such as smaller, increasing country starts to promote the use of LED.
There is the electrical network of a lot of areas or country (as Taiwan and Brazil etc.) due to historical reasons, usually there is multiple standard civil power, as 110V, 220V, 230V alternating voltage coexists.For the lighting of these countries, need the lighting solutions meeting full voltage.Existing scheme realizes with the framework of Switching Power Supply, and the existing electric current that realizes exists high to the requirement of components and parts, with high costs, and market is called has the scheme of low cost to realize.
Summary of the invention
The present invention, in order to overcome the existing LED drive circuit meeting multiple voltage supply and problem that cost high high to requirement on devices, provides a kind of circuit to connect the LED circuit of simple, that cost is low compatible low pressure and high input voltage constant power output.
To achieve these goals, the LED circuit that the invention provides a kind of compatible low pressure and high input voltage constant power output comprises input, LED load, constant-current controller and at least one power controller.Input receives external power source.LED load is electrically connected input.Constant-current controller is connected with LED load, for LED load provides constant current.Each power controller includes control unit and power conditioning module, power conditioning module is electrically connected constant-current controller, control unit is electrically connected input and power conditioning module, and the voltage swing of the external power source that control unit receives according to input controls the incision of power conditioning module or cuts out.
In one embodiment of the invention, control unit comprises comparator, voltage-reference and control switch, an input of comparator and voltage-reference are electrically connected, another input of comparator is electrically connected input, the control pole of the output connection control switch of comparator, the closing contact of control switch is electrically connected power conditioning module.
In one embodiment of the invention, control switch is that withstand voltage is at 500V ~ 800V.
In one embodiment of the invention, the LED circuit of compatible low pressure and high input voltage constant power output also comprises the resitstance voltage divider be electrically connected between input and control unit.
In one embodiment of the invention, power conditioning module comprises current-limiting resistance and the power adjustments load of series connection mutually.
In one embodiment of the invention, power adjustments load is LED.
In one embodiment of the invention, the LED circuit of compatible low pressure and high input voltage constant power output also comprises rectification circuit and filter capacitor, and rectification circuit is connected between input and LED load, and filter capacitor is in parallel with LED load.
In one embodiment of the invention, rectification circuit is full-wave bridge rectifier circuit.
In one embodiment of the invention, the LED circuit of compatible low pressure and high input voltage constant power output also comprises the sample resistance be electrically connected between input and control switch, and sample resistance provides operating current for control unit.
In sum, the LED circuit of compatible low pressure provided by the invention and high input voltage constant power output compared with prior art, has the following advantages:
By arranging at least one power controller at the output of input and LED load, power controller comprises control unit and power conditioning module, control unit detects the line voltage of input input, when line voltage switches, during as being switched to 220V or 230V of high pressure from the 110V of low pressure, power conditioning module is cut in circuit by control unit, make the power output of circuit identical with the power output under low pressure 110V, ensure that power output is constant when low pressure input and high input voltage, meet the power reguirements of different line voltage.The LED circuit of compatible low pressure provided by the invention and high input voltage constant power output only need increase on traditional LED drive circuit a power controller can realize different power voltage under power stage constant, and the circuit structure of power controller is simple, as long as the device in control unit can meet the change of logic, low to the requirement of device, greatly reduce the cost of circuit design.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Accompanying drawing explanation
Figure 1 shows that the schematic diagram of existing LED drive circuit.
Figure 2 shows that the theory diagram of the LED drive circuit of the compatible low pressure that one embodiment of the invention provides and high input voltage constant power output.
Figure 3 shows that the physical circuit schematic diagram of Fig. 2.
Embodiment
As shown in Figure 1, in existing LED drive circuit, DB is rectifier bridge, civil power is carried out rectification, electrochemical capacitor C1 is used to the voltage waveform after stable rectifier bridge DB, U1 is current constant control chip, make the current constant flowing through load LED, and resistance R1 is used to regulate the size of current flowing through load LED.Existing LED drive circuit, can only limit low pressure input or high input voltage, compatible high pressure or low pressure cannot input simultaneously, cannot meet and have the country of multiple standard civil power or the LED illumination demand in region.
In view of this, the present embodiment provides the LED circuit of a kind of compatible low pressure and high input voltage constant power output to comprise input 1, LED load 2, constant-current controller 3 and at least one power controller 4.Input 1 receives external power source.LED load 2 is electrically connected input 1.Constant-current controller 3 is connected with LED load 2, for LED load 2 provides constant current.Each power controller 4 includes control unit 41 and power conditioning module 42, power conditioning module 42 is electrically connected constant-current controller 3, control unit 41 is electrically connected input 1 and power conditioning module 42, and the size of the outer power voltage that control unit 41 receives according to input 1 controls the incision of power conditioning module 42 or cuts out.
Control unit 41 detects the magnitude of voltage that input 1 inputs in real time, and when input voltage is low pressure (as 110V), the compatible low pressure that the present embodiment provides is identical with existing LED drive circuit structure with the LED circuit of high input voltage constant power output.And when input voltage is converted to high pressure (as 220V) from low pressure, power conditioning module 42 is cut circuit by control unit 41, the output voltage of circuit changes, current-limiting resistance in Modulating Power adjustment module 42 is identical when power output is inputted with low pressure, namely keeps power output constant.
In the present embodiment, power conditioning module 42 comprises current-limiting resistance R5 and the power adjustments load R of series connection mutually.In the present embodiment, power adjustments load R is LED.But the present invention is not limited in any way this.
In the present embodiment, the LED circuit of compatible low pressure and high input voltage constant power output also comprises rectification circuit 5 and filter capacitor 6, and rectification circuit 5 is connected between input 1 and LED load 2, and filter capacitor 6 is in parallel with LED load 2.In the present embodiment, rectification circuit 5 is full-wave bridge rectifier circuit.
The operation principle of the LED circuit of compatible low pressure that the present embodiment provides and high input voltage constant power output will be introduced in detail below:
The LED circuit of the compatible low pressure that the present embodiment provides and high input voltage constant power output adds power controller 4 on the basis of traditional LED drive circuit, because general country is up to the civil power of two standards, the quantity therefore arranging power controller 4 is one.But the quantity of the present embodiment to power controller 4 is not restricted.In other embodiment, the quantity of power controller 4 can be two or more.
As shown in Figure 2, the V of control unit 41
tHpin is used for detecting the voltage after rectifier bridge, V
iNfor control unit 41 provides operating current, SW pin is the withstand voltage switch of 500V a to 800V to GND pin.Because line voltage is higher, after rectification circuit 5 through resistance R2 and R3 form resitstance voltage divider 7 dividing potential drop after through V
tHpin inputs to control unit 41.V
tHthe voltage that pin detects determines whether control switch 41 cuts circuit by power conditioning module 42.
When being input as low pressure (110V), V
tHwhen the voltage that pin detects is less than the internal reference voltage of control unit 41, SW pin is to the short circuit of GND pin, the electric current now exported can not through power adjustments load R and current-limiting resistance R5, now output voltage values is exactly the lamp pearl voltage of LED load 2, and the size of output current is determined by the resistance value of resistance R4.When being input as high pressure (220V), V
tHwhen the voltage that pin detects is more than or equal to internal reference voltage, SW pin is to the open circuit of GND pin, the electric current now exported will through power adjustments load R and current-limiting resistance R5, the voltage now exported becomes the lamp pearl voltage of LED load 2 and the lamp pearl voltage sum of power adjustments load R, the electric current exported is determined jointly by the resistance value of resistance R4 and current-limiting resistance R5, just can realize under high pressure or low pressure input condition by arranging resistance R4 and current-limiting resistance R5, power output keeps constant.
In the present embodiment, control unit 41 comprises comparator A, voltage-reference S and control switch K, and an input of comparator A and voltage-reference S are electrically connected, another input (V of comparator A
tHpin) be electrically connected input 1, the control pole of the output connection control K switch of comparator A, the closing contact (SW pin) of control switch is electrically connected power conditioning module 42.Control switch K is that withstand voltage is at 500V ~ 800V.Comparator A compares and decides control switch K whether conducting from sample internal reference voltage that the magnitude of voltage that obtains and voltage-reference S set of input 1.Time in a low voltage state, control switch K conducting, the electric current flowing through LED load 2 is determined by resistance R4; Time in a high voltage state, control switch K disconnects, and power adjustments load 42 is cut circuit and ensured that power output is constant.In the present embodiment, control switch K is power field effect pipe.But the present invention is not limited in any way this.
In the present embodiment, the LED circuit of compatible low pressure and high input voltage constant power output also comprises the sample resistance R6 be electrically connected between input 1 and control switch 41, and sample resistance R6 provides operating current for control unit 41.In the present embodiment, sample resistance R6 provides operating current for comparator A.This setting can enormously simplify the design of comparator A working power.But the present invention is not limited in any way this.Other power supply can be adopted in other embodiment to provide operating current for comparator A.
In sum, by arranging at least one power controller at the output of input and LED load, power controller comprises control unit and power conditioning module, control unit detects the line voltage of input input, when line voltage switches, during as being switched to 220V or 230V of high pressure from the 110V of low pressure, power conditioning module is cut in circuit by control unit, make the power output of circuit identical with the power output under low pressure 110V, ensure that the power output of circuit is constant when low pressure input and high input voltage, meet the power reguirements of different line voltage.The LED circuit of compatible low pressure provided by the invention and high input voltage constant power output only need increase the current power that a power controller can realize under different power voltage and export constant on traditional LED drive circuit, and the circuit structure of power controller is simple, as long as the device in control unit can meet the change of logic, low to the requirement of device, greatly reduce the cost of circuit design.
Although the present invention discloses as above by preferred embodiment; but and be not used to limit the present invention, anyly know this those skilled in the art, without departing from the spirit and scope of the present invention; can do a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on claims scope required for protection.
Claims (9)
1. a LED circuit for compatible low pressure and high input voltage constant power output, is characterized in that, comprising:
Input, receives external power source;
LED load, is electrically connected input;
Constant-current controller, connects with LED load, for LED load provides constant current;
At least one power controller, each power controller includes control unit and power conditioning module, power conditioning module is electrically connected constant-current controller, control unit is electrically connected input and power conditioning module, and the voltage swing of the external power source that control unit receives according to input controls the incision of power conditioning module or cuts out.
2. the LED circuit of compatible low pressure according to claim 1 and high input voltage constant power output, it is characterized in that, described control unit comprises comparator, voltage-reference and control switch, an input of comparator and voltage-reference are electrically connected, another input of comparator is electrically connected input, the control pole of the output connection control switch of comparator, the closing contact of control switch is electrically connected power conditioning module.
3. require the LED circuit of compatible low pressure described in 2 and high input voltage constant power output according to power, it is characterized in that, described control switch is that withstand voltage is at 500V ~ 800V.
4. require the LED circuit of compatible low pressure described in 1 or 2 and high input voltage constant power output according to power, it is characterized in that, the LED circuit of compatible low pressure and high input voltage constant power output also comprises the resitstance voltage divider be electrically connected between input and control unit.
5. the compatible low pressure according to right 1 and the LED circuit of high input voltage constant power output, is characterized in that, described power conditioning module comprises current-limiting resistance and the power adjustments load of series connection mutually.
6. the LED circuit of compatible low pressure according to claim 5 and high input voltage constant power output, is characterized in that, described power adjustments load is LED.
7. the LED circuit of compatible low pressure according to claim 1 and high input voltage constant power output, it is characterized in that, the LED circuit of described compatible low pressure and high input voltage constant power output also comprises rectification circuit and filter capacitor, rectification circuit is connected between input and LED load, and filter capacitor is in parallel with LED load.
8. the LED circuit of compatible low pressure according to claim 7 and high input voltage constant power output, is characterized in that, described rectification circuit is full-wave bridge rectifier circuit.
9. the LED circuit of compatible low pressure according to claim 1 and high input voltage constant power output, it is characterized in that, the LED circuit of described compatible low pressure and high input voltage constant power output also comprises the sample resistance be electrically connected between input and control switch, and sample resistance provides operating current for control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557016.7A CN105188211A (en) | 2015-09-02 | 2015-09-02 | Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557016.7A CN105188211A (en) | 2015-09-02 | 2015-09-02 | Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output |
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| CN105188211A true CN105188211A (en) | 2015-12-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994167A (en) * | 2021-03-19 | 2021-06-18 | 维沃移动通信有限公司 | Charging device, electronic apparatus, charging control method, and charging control device |
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Application publication date: 20151223 |
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