CN201369858Y - Device for supplying stable working current for LED lamps in wide voltage range - Google Patents
Device for supplying stable working current for LED lamps in wide voltage range Download PDFInfo
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- CN201369858Y CN201369858Y CNU2008201444033U CN200820144403U CN201369858Y CN 201369858 Y CN201369858 Y CN 201369858Y CN U2008201444033 U CNU2008201444033 U CN U2008201444033U CN 200820144403 U CN200820144403 U CN 200820144403U CN 201369858 Y CN201369858 Y CN 201369858Y
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Abstract
The utility model relates to a device for supplying stable working current for LED lamps in a wide voltage range, consisting of a voltage reducing unit (1), a rectifying unit (2), a filtering unit (3), an LED lamp string unit (4) and a constant current control unit (5). The device adopts a high-voltage adjustable voltage-stabilizing power supply TL783 to keep the stability and the consistence of the working current of an LED lamp string in a wide voltage range. The utility model has the advantages that when the commercial power is changed from the 165 V to the 275 V, the working current passing by the LED lamps is kept unchanged, and the brightness of the LED lamps is kept unchanged, therefore the service lives of the LED lamps are ensured. If an R3 is used as a precision metal film resistor with the resistance value of 62.5plus and minus1% Ohm, the working current of 20 plus and minus 1% mA of the LED lamps can be obtained without debugging the LED lamps, and the consistent brightness of the LED lamps can be ensured. The working current of the LED string can be changed if the resistor of other resistance value is selected.
Description
Affiliated technical field
The utility model relates to lighting field, and the device of stable operating current particularly is provided for the LED lamp in wide-voltage range.
Background technology
Along with the successful exploitation of super brightness white light emitting diode LED with produce in batches, long, low in energy consumption and LED compliance with environmental protection requirements of life-span has obtained extensive use at lighting field.At present, with the existing different drive scheme of three classes of civil power driving LED lamp.But first kind scheme is too complicated, and it adopts operational amplifier and pulse width modulation circuit to constitute complicated reponse system to reach the purpose of stablizing LED lamp operating current; The second class scheme is then too simple, and the circuit that for example has directly is connected (Fig. 1) after bridge rectifier and the filter with LED lamp string, and the circuit that has then is connected in series a resistance R 4 (Fig. 2) again on LED lamp string.Electric current by LED lamp string must have significant change when mains fluctuation in these circuit, causes the brightness of LED lamp string that significant change is arranged, and the LED lamp is damaged; It is stable that the 3rd class scheme adopts current regulator diode, the operating current of LED lamp string to be guaranteed, but the operating current of each current regulator diode and inequality and can't regulate causes the brightness of each LED lamp also inequality.
Summary of the invention
The utility model will overcome the deficiencies in the prior art, provide a kind of circuit structure simple, and operating current does not change with mains fluctuation and the electric supply installation of very consistent LED lamp.
It is stable with consistent that the utility model is implemented in the operating current that keeps LED lamp string in the wide-voltage range with high pressure scalable stabilized voltage power supply TL783.
The OUT output of TL783 is connected with the ADJ end of TL783 by resistance R 3.There is canonical reference voltage Vref=1.25V between the OUT output of TL783 and the ADJ end.The constant current that flows into the IN input of TL783 will equal Vref ÷ R3.The numerical value that changes R3 just can change the numerical value of electric current.The TL783 input voltage has the adjustable range of broad, and promptly the voltage difference between TL783 input and the output can change in the 125V scope at 5V.The value of standard reference voltage Vref is constant when changing in above scope, and it is stable that the operating current that passes through also will keep.
The utility model is made up of pressure unit [1], rectification unit [2], filter unit [3], LED lamp string location [4] and constant current control unit [5], as shown in Figure 3.
Fig. 4, Fig. 5 and Fig. 6 are three kinds of circuit diagrams that stable operating current is provided for the LED lamp in wide-voltage range.
Pressure unit in Fig. 4 [1] is made up of resistor R 1 and capacitor C1, rectification unit [2] is made up of diode D1, D2, D3 and D4, filter unit [3] is made up of resistor R 2 and electrolytic capacitor C2, LED lamp string location [4] by LED 1, LED2 ,～and LEDn form, constant current control unit [5] is made up of high pressure scalable stabilized voltage power supply TL783 and resistor R 3.Its connected mode is as follows: an end of resistor R 1 connects the end of capacitor C1 and is connected with an end of civil power.The other end of resistor R 1 is connected with the other end of capacitor C1, and is connected with the positive pole of the diode D1 of rectification unit [2] and the negative pole of diode D2.The negative pole of the cathode connecting diode D4 of diode D3 also is connected with the other end of civil power.The negative pole of diode D1 is connected with the negative pole of diode D3 and is connected and connects the positive terminal of LED lamp string location [4] with the anode of end of the resistor R 2 of filter unit [3] and electrolytic capacitor C2.The positive pole of diode D2 is connected with the positive pole of diode D4 and is connected with the other end of the resistor R 2 of filter unit [3] and the negative terminal of electrolytic capacitor C2.The OUT end of the TL783 of constant current control unit [5] connects an end of resistor R 3, and the ADJ end of TL783 connects the other end of resistor R 3, and the ADJ end of TL783 also connects the negative terminal of the electrolytic capacitor C2 of filter unit [3].The IN end of TL783 connects the negative pole end of LED lamp string location [4].
Fig. 5 is the circuit diagram of the second way.The composition of each unit is identical with Fig. 4.The change of its connected mode is: the IN end of TL783 directly connects the anode of the electrolytic capacitor C2 of filter unit [3].The ADJ end of TL783 connects the positive terminal of LED lamp string location [4].The negative pole end of LED lamp string location [4] connects the negative terminal of electrolytic capacitor C2.
Fig. 6 is the circuit diagram of the third mode.The composition of each unit is identical with Fig. 4.The change of its connected mode is: LED lamp string location [4] separated into two parts in Fig. 6, i.e. LED lamp string A and LED lamp string B.Method of attachment is as follows: the IN end of TL783 connects the negative pole end of LED lamp string A, the positive terminal of LED lamp string A connects the anode of the electrolytic capacitor C2 of filter unit [3], the ADJ end of TL783 connects the positive terminal of LED lamp string B, and the negative pole end of LED lamp string B connects the negative terminal of the electrolytic capacitor C2 of filter unit [3].
The beneficial effects of the utility model are when civil power changes to 275V by 165V, and are constant by the operating current of LED lamp, and the brightness of LED lamp remains unchanged.Guaranteed the useful life of LED lamp.If selecting R3 is the precision metallic film resistance, and to select its resistance be 62.5 Ω ± 1%, and not needing to debug the operating current that can obtain the LED lamp is 20mA ± 1%.Thereby guarantee the consistency of each LED lamp brightness.Select R3 can change the numerical value of the operating current of LED lamp string for other resistances.
Description of drawings
The circuit 1 that Fig. 1 uses always with civil power driving LED lamp.
The circuit 2 that Fig. 2 uses always with civil power driving LED lamp.
Fig. 3 drives with civil power and the stable block diagram of maintenance LED lamp string operating current.
Fig. 4 uses TL783 to realize the stable circuit diagram 1 of LED lamp operating current.
Fig. 5 uses TL783 to realize the stable circuit diagram 2 of LED lamp operating current.
Fig. 6 uses TL783 to realize the stable circuit diagram 3 of LED lamp operating current
Embodiment
Any among Fig. 4, Fig. 5 and Fig. 6 can be as embodiment of the present utility model.The above resistance of the optional `100k Ω of the resistance of resistor R 1, the usefulness of capacitor C1 discharge during for shutdown.The capacity of capacitor C1 is more little, and the amplitude of step-down is big more.The choice of capacity of capacitor C1 is looked the number of LED in the LED lamp string and is determined, and should make the input of TL783 and the voltage difference between the output that a suitable numerical value is arranged.The optional 1N4007 of diode D1, D2, D3 and D4.The 47 μ F electric capacity of the optional withstand voltage 400V of electrolytic capacitor C2.Resistor R 2 optional 1W-100k Ω, the usefulness of capacitor C2 discharge during for shutdown.Resistor R 3 is the precision metallic film resistance, and its resistance is elected 62.5 Ω ± 1% as o'clock can guarantee that the operating current of LED lamp string is 20mA ± 1%.Can change the operating current of LED lamp string when selecting other resistances.
Claims (3)
1, a kind of device that stable operating current is provided for the LED lamp in wide-voltage range, by pressure unit [1], rectification unit [2], filter unit [3], LED lamp string location [4] and constant current control unit [5] are formed, it is characterized in that described constant current control unit [5] is made up of high pressure scalable stabilized voltage power supply TL783 and resistor R 3, the OUT end of TL783 connects an end of resistor R 3, the ADJ end of TL783 connects the other end of resistor R 3, the ADJ end of TL783 exists three kinds of modes to link to each other with other unit with the IN end, the IN of TL783 end connects the negative pole end of LED lamp string location [4] under first kind of mode, the ADJ end of TL783 connects the negative terminal of the electrolytic capacitor C2 of filter unit [3], the positive terminal of LED lamp string location [4] connects the anode of the electrolytic capacitor C2 of filter unit [3], the IN of TL783 end connects the anode of the electrolytic capacitor C2 of filter unit [3] under the second way, the ADJ end of TL783 connects the positive terminal of LED lamp string location [4], the negative pole end of lamp string location [4] connects the negative terminal of the electrolytic capacitor C2 of filter unit [3], the IN of TL783 end connects the negative pole end of the LED lamp string A of lamp string location [4] under the third mode, the positive terminal of LED lamp string A connects the anode of the electrolytic capacitor C2 of filter unit [3], the ADJ end of TL783 connects the positive terminal of the LED lamp string B of LED lamp string location [4], and the negative pole end of LED lamp string B connects the negative terminal of the electrolytic capacitor C2 of filter unit [3].
2, a kind of device that stable operating current is provided for the LED lamp in wide-voltage range according to claim 1, it is characterized in that described pressure unit [1] is made up of resistor R 1 and capacitor C1, one end of resistor R 1 connects the end of capacitor C1 and is connected with an end of civil power, the other end of resistor R 1 is connected with the other end of capacitor C1, and is connected with the positive pole of the diode D1 of rectification unit [2] and the negative pole of diode D2.
3, a kind of device that stable operating current is provided for the LED lamp in wide-voltage range according to claim 1, it is characterized in that described rectification unit [2] is by diode D1, D2, D3 and D4 form, the negative pole of the cathode connecting diode D4 of diode D3 also is connected with the other end of civil power, the negative pole of diode D1 is connected with the negative pole of diode D3 and is connected with an end of the resistor R 2 of filter unit [3] and the anode of electrolytic capacitor C2, and the positive pole of diode D2 is connected with the positive pole of diode D4 and is connected with the other end of the resistor R 2 of filter unit [3] and the negative terminal of electrolytic capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201444033U CN201369858Y (en) | 2008-12-12 | 2008-12-12 | Device for supplying stable working current for LED lamps in wide voltage range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201444033U CN201369858Y (en) | 2008-12-12 | 2008-12-12 | Device for supplying stable working current for LED lamps in wide voltage range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369858Y true CN201369858Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201444033U Expired - Fee Related CN201369858Y (en) | 2008-12-12 | 2008-12-12 | Device for supplying stable working current for LED lamps in wide voltage range |
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| Country | Link |
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| CN (1) | CN201369858Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201976295U (en) * | 2011-01-11 | 2011-09-14 | 建准电机工业股份有限公司 | Lamp and power control circuit thereof |
| CN102933005A (en) * | 2012-11-23 | 2013-02-13 | 上海顿格电子贸易有限公司 | Circuit for LED constant current power supply |
| CN104168683A (en) * | 2013-05-20 | 2014-11-26 | 深圳市海洋王照明工程有限公司 | LED drive circuit |
-
2008
- 2008-12-12 CN CNU2008201444033U patent/CN201369858Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201976295U (en) * | 2011-01-11 | 2011-09-14 | 建准电机工业股份有限公司 | Lamp and power control circuit thereof |
| CN102933005A (en) * | 2012-11-23 | 2013-02-13 | 上海顿格电子贸易有限公司 | Circuit for LED constant current power supply |
| CN104168683A (en) * | 2013-05-20 | 2014-11-26 | 深圳市海洋王照明工程有限公司 | LED drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20121212 |