CN102612228A - LED (Light-emitting Diode) constant-current and constant-temperature driving power supply - Google Patents
LED (Light-emitting Diode) constant-current and constant-temperature driving power supply Download PDFInfo
- Publication number
- CN102612228A CN102612228A CN2012100618289A CN201210061828A CN102612228A CN 102612228 A CN102612228 A CN 102612228A CN 2012100618289 A CN2012100618289 A CN 2012100618289A CN 201210061828 A CN201210061828 A CN 201210061828A CN 102612228 A CN102612228 A CN 102612228A
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- circuit
- constant
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention provides an LED (Light-emitting Diode) constant-current and constant-temperature driving power supply, comprising a rectifying filter circuit, a transformer, a current mode controller, an MOS (Metal Oxide Semiconductor) tube and a constant-current and constant-temperature circuit, wherein a 220-V alternating voltage is processed by the rectifying filter circuit to obtain a direct current voltage and the direct current voltage is applied to a drain electrode of the MOS tube to form a main loop by a drain source of the MOS tube; meanwhile, the obtained direct current voltage is divided by a resistor to provide a starting voltage to the current mode controller; a high-frequency voltage obtained by the transformer is rectified and filtered to provide a work voltage to the current mode controller; an output voltage obtained by the transformer supplies power to a load; and the level fluctuation of the current mode controller is controlled by the constant-current and constant-temperature circuit so as to control an output of the power supply. Under the precondition of constant-current driving, when the temperature of an LED is raised to a certain degree, the power supply automatically adjusts the driving current to control a junction temperature of the LED in an allowable range, so as to ensure the work safety of the LED, effectively guarantee the normal work of the LED, prolong the service life of the LED and reduce light decay generated by an over-high temperature.
Description
Technical field
The present invention relates to a kind of LED drive unit, specifically, relate to a kind of LED driving power.
Background technology
LED has advantages such as environmental protection and energy saving, long service life and is described as the optimal illumination light source of 21 century, and along with the continuous popularization of government and the raising of people's environmental consciousness, LED begins to replace conventional light source on a large scale, and then is widely used in different occasions.But because the particularity of LED itself, it must operate in the burning voltage environment; If voltage instability just possibly damage LED, at present, the driving power of LED commonly used all is to adopt constant-current supply; I.e. DC voltage-stabilizing before this, and then constant-current driving, and; The constant-current circuit overwhelming majority is to control with pulse width modulating chip, and it is constant that the average current that flows through LED is able to, but when its constant-current driving; Because the heat on the LED increases in use gradually, damage to such an extent as to make LED cause producing light decay because of temperature is too high, influence the useful life of LED.
Summary of the invention
The objective of the invention is to above-mentioned deficiency to the existence of LED driving power; A kind of LED of reducing light decay is provided, has prolonged the LED LED constant current constant temperature driving power in useful life, to such an extent as to this driving power protects large-power LED light bead to make it not can Yin Wendu too high and produce light decay and damage effectively.
Technical scheme of the present invention is: a kind of LED constant current constant temperature driving power, this driving power comprises current rectifying and wave filtering circuit, transformer T
1, current mode controller, metal-oxide-semiconductor and constant-temperature constant-current circuit, the 220V alternating voltage obtains the 305-315V direct voltage through current rectifying and wave filtering circuit rectification, filtering, through transformer T
1Primary coil L
1Add to the drain electrode of metal-oxide-semiconductor, through the drain-source formation major loop of metal-oxide-semiconductor; Simultaneously, obtain the 305-315V direct voltage through resistance R
1Dividing potential drop provides starting resistor to current mode controller, make it to open shake output square wave drive metal-oxide-semiconductor conducting and end; Transformer T
1Primary coil L
2The high frequency voltage of last induction provides operating voltage to current mode controller after rectification, filtering; Transformer T
1Secondary coil L
3The electromotive force of last induction obtains output voltage through rectification, filtering and powers to the load, and the output voltage that obtains is through the level variation of constant-temperature constant-current circuit Control current mode controller, through the output of current mode controller output control voltage-controlled source.
Preferably, current rectifying and wave filtering circuit comprises rectification circuit and filter circuit, and rectification circuit is by D
1, D
2, D
3, D
4The bridge rectifier of forming, filter circuit is by capacitor C
1Form.
Preferably, the 220V alternating voltage obtains the 305-315V direct voltage through current rectifying and wave filtering circuit rectification, filtering, through a buffer circuit through transformer T
1Primary coil L
1Add to the drain electrode of metal-oxide-semiconductor, described buffer circuit is by resistance R
2, capacitor C
4Parallel connection back and diode D
13The circuit that is composed in series.
Preferably, transformer T
1Primary coil L
2The high frequency voltage of last induction is via diode D
5And capacitor C
7To current mode controller operating voltage is provided after the circuit rectification of forming, the filtering.
Preferably, transformer T
1Secondary coil L
3The electromotive force of last induction is through diode D
7And capacitor C
9Circuit rectification, the filtering formed obtain output voltage and power to the load.
Preferably, the constant temperature and pressure circuit comprises parallel voltage-stabilizing integrated circuit and photoelectrical coupler, transformer T
1Secondary coil L
3The electromotive force of last induction is got a voltage at the R of parallel voltage-stabilizing integrated circuit on extremely through a bleeder circuit through output voltage that rectification, filtering obtain and is compared with its inner 2.5V reference voltage; Make the A utmost point of parallel voltage-stabilizing integrated circuit and the change in voltage between the K utmost point, thereby make the I of photoelectrical coupler
fChange, the level of Control current mode controller changes.
Preferably, bleeder circuit is by resistance R
10, thermistor R
11, voltage stabilizing didoe D
WBe composed in series thermistor R successively
11Adopt semistor.
Preferably, the parallel voltage-stabilizing integrated circuit adopts TL431.
Preferably, metal-oxide-semiconductor adopts the PMOS pipe, is connected to sample resistance R between metal-oxide-semiconductor and the current mode controller
7
Preferably, current mode controller adopts the UC3844 of 8 pins.
The invention has the beneficial effects as follows: the present invention is under the prerequisite of constant-current driving; When the LED temperature is elevated to a certain degree; Power supply will be adjusted the junction temperature that drive current makes LED automatically and be controlled in the temperature of permission, guarantee the work safety of LED, guarantee the operate as normal of LED effectively; Prolong the useful life of LED, reduced the too high and light decay that produces of Yin Wendu.
Description of drawings
Accompanying drawing 1 is a specific embodiment of the invention circuit theory diagrams.
Embodiment
Embodiment of the present invention: as shown in Figure 1, a kind of LED constant current constant temperature driving power, this driving power comprises current rectifying and wave filtering circuit, transformer T
1, current mode controller UC3844, PMOS manage Q
1With the constant temperature and pressure circuit, be connected to sample resistance R between PMOS pipe and the current mode controller
7, the constant temperature and pressure circuit comprises parallel voltage-stabilizing integrated circuit TL431 and photoelectrical coupler, current mode controller UC3844 is connected with parallel voltage-stabilizing integrated circuit TL431 through photoelectrical coupler; The 220V alternating voltage is via D
1, D
2, D
3, D
4The bridge rectifier rectification of forming, capacitor C
1After the filtering, obtain the direct voltage of 305-315V, through one by resistance R
2, capacitor C
4Parallel connection back and diode D
13The buffer circuit that is composed in series is through transformer T
1Primary coil L
1Be added to PMOS pipe Q
1Drain electrode, through PMOS pipe Q
1Drain-source form major loop; Simultaneously, 305-315V voltage is through R
1Dividing potential drop provides starting resistor for current mode controller UC3844, makes it to open the output square wave drive PMOS pipe Q that shakes
1Conducting and ending.Transformer T
1Primary coil L
2The high frequency voltage of last induction is via diode D
5And capacitor C
7Operating voltage is provided for after the circuit rectification of forming, the filtering current mode controller UC3844.Transformer T
1Secondary coil L
3The electromotive force of last induction is through diode D
7And capacitor C
9Circuit rectification, the filtering formed obtain output voltage and power to the load; And the output voltage that obtains is got a voltage at the R of parallel voltage-stabilizing integrated circuit TL431 on extremely through bleeder circuit and is compared with its inner 2.5V reference voltage; Make the A utmost point of parallel voltage-stabilizing integrated circuit TL431 and the change in voltage between the K utmost point, thereby make the I of photoelectrical coupler
fChange, the level of Control current mode controller UC3844 changes, through the output of current mode controller UC3844 output control voltage-controlled source.
During work:
Transformer T
1The former limit inductive current sampling resistor R that flows through
7The voltage that produces constitutes the Current Control closed loop through 3 pin of delivering to current mode controller UC3844 after the filtering; When 3 voltages of current mode controller UC3844 surpass 1V; The PWM latch of current mode controller UC3844 is with locking pulse, to the circuit start overcurrent protection.8 pin of current mode controller UC3844 and the resistance R between 4 pin
4And the capacitor C between 8 jiaos and the ground
3Be timing element, the inner concussion frequency of decision current mode controller UC3844, current mode controller UC3844 inside is 2 frequency divisions, so drive PMOS pipe Q
1Square wave frequency be the half the of inner concussion frequency.At transformer T
1The buffer circuit on former limit is used to limit the peak voltage that the high frequency transformer leakage inductance causes, transformer T
1Secondary and diode D
5The parallel connection by resistance R
3And capacitor C
7The loop of forming is used to reduce diode D
5Peak voltage between reverse recovery.
The R utmost point below-center offset resistance of constant current thermostatic control process: TL431 is by sample resistance R, voltage stabilizing didoe D
W, and semistor R
11Form thermistor R during normal temperature
11The very little (R of resistance
11＜＜R
10), its voltage U
R11Very little; D
WThe voltage constant at two ends is 2V, thereby the electric current of power supply output receives the voltage control at R two ends.When output current increases, U
RIncrease, the R pole tension of TL431 raises, thereby output voltage is reduced, and output current reduces; Otherwise when output current diminishes, U
RReduce, the R pole tension of TL431 reduces, thereby output voltage is raise, and output current also will increase, thereby output current is constant all the time.When LED and the rising of power supply temperature, thermistor R
11Resistance increase thereby U
R11Also increase, thereby the R utmost point below-center offset resistance of TL431 is increased, the R pole tension of TL431 raises, and the output pulse width of regulating UC3844 through TL431 and photoelectrical coupler reduces output current, thereby control LED and power supply temperature reach the purpose of constant temperature.
Claims (10)
1. LED constant current constant temperature driving power, it is characterized in that: this driving power comprises current rectifying and wave filtering circuit, transformer T
1, current mode controller, metal-oxide-semiconductor and constant-temperature constant-current circuit, the 220V alternating voltage obtains the 305-315V direct voltage through current rectifying and wave filtering circuit rectification, filtering, through transformer T
1Primary coil L
1Add to the drain electrode of metal-oxide-semiconductor, through the drain-source formation major loop of metal-oxide-semiconductor; Simultaneously, obtain the 305-315V direct voltage through resistance R
1Dividing potential drop provides starting resistor to current mode controller, make it to open shake output square wave drive metal-oxide-semiconductor conducting and end; Transformer T
1Primary coil L
2The high frequency voltage of last induction provides operating voltage to current mode controller after rectification, filtering; Transformer T
1Secondary coil L
3The electromotive force of last induction obtains output voltage through rectification, filtering and powers to the load, and the output voltage that obtains is through the level variation of constant-temperature constant-current circuit Control current mode controller, through the output of current mode controller output control voltage-controlled source.
2. LED constant current constant temperature driving power as claimed in claim 1, it is characterized in that: current rectifying and wave filtering circuit comprises rectification circuit and filter circuit, rectification circuit is by D
1, D
2, D
3, D
4The bridge rectifier of forming, filter circuit is by capacitor C
1Form.
3. LED constant current constant temperature driving power as claimed in claim 1, it is characterized in that: the 220V alternating voltage obtains the 305-315V direct voltage through current rectifying and wave filtering circuit rectification, filtering, through a buffer circuit through transformer T
1Primary coil L
1Add to the drain electrode of metal-oxide-semiconductor, described buffer circuit is by resistance R
2, capacitor C
4Parallel connection back and diode D
13The circuit that is composed in series.
4. LED constant current constant temperature driving power as claimed in claim 1 is characterized in that: transformer T
1Primary coil L
2The high frequency voltage of last induction is via diode D
5And capacitor C
7To current mode controller operating voltage is provided after the circuit rectification of forming, the filtering.
5. LED constant current constant temperature driving power as claimed in claim 1 is characterized in that: transformer T
1Secondary coil L
3The electromotive force of last induction is through diode D
7And capacitor C
9Circuit rectification, the filtering formed obtain output voltage and power to the load.
6. LED constant current constant temperature driving power as claimed in claim 1, it is characterized in that: the constant temperature and pressure circuit comprises parallel voltage-stabilizing integrated circuit and photoelectrical coupler, transformer T
1Secondary coil L
3The electromotive force of last induction is got a voltage at the R of parallel voltage-stabilizing integrated circuit on extremely through a bleeder circuit through output voltage that rectification, filtering obtain and is compared with its inner 2.5V reference voltage; Make the A utmost point of parallel voltage-stabilizing integrated circuit and the change in voltage between the K utmost point, thereby make the I of photoelectrical coupler
fChange, the level of Control current mode controller changes.
7. LED constant current constant temperature driving power as claimed in claim 6, it is characterized in that: bleeder circuit is by resistance R
10, thermistor R
11, voltage stabilizing didoe D
WBe composed in series thermistor R successively
11Adopt semistor.
8. LED constant current constant temperature driving power as claimed in claim 6 is characterized in that: the parallel voltage-stabilizing integrated circuit adopts TL431.
9. LED constant current constant temperature driving power as claimed in claim 1 is characterized in that: metal-oxide-semiconductor adopts the PMOS pipe, is connected to sample resistance R between metal-oxide-semiconductor and the current mode controller
7
10. like any described LED constant current constant temperature driving power of claim 1 to 9, it is characterized in that: current mode controller adopts the UC3844 of 8 pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100618289A CN102612228A (en) | 2012-03-12 | 2012-03-12 | LED (Light-emitting Diode) constant-current and constant-temperature driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100618289A CN102612228A (en) | 2012-03-12 | 2012-03-12 | LED (Light-emitting Diode) constant-current and constant-temperature driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102612228A true CN102612228A (en) | 2012-07-25 |
Family
ID=46529288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100618289A Pending CN102612228A (en) | 2012-03-12 | 2012-03-12 | LED (Light-emitting Diode) constant-current and constant-temperature driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102612228A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102259A (en) * | 2016-08-18 | 2016-11-09 | 张银月 | A kind of LED overheat step-down circuit |
| CN106793312A (en) * | 2016-12-29 | 2017-05-31 | 伊戈尔电气股份有限公司 | A kind of H bridges switch colour temperature circuit |
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221450A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Constant temperature equipment for instrument |
| CN101605412A (en) * | 2009-07-17 | 2009-12-16 | 罗宏基 | The LED electrified light emitting circuit |
| CN201706260U (en) * | 2010-05-11 | 2011-01-12 | 浙江金中机电科技有限公司 | LED lamp capable of changing color temperature and brightness |
| CN202068621U (en) * | 2011-04-22 | 2011-12-07 | 中山市诚创电器有限公司 | High power light emitting diode (LED) high efficiency driving power supply |
| CN102290995A (en) * | 2011-07-16 | 2011-12-21 | 西安电子科技大学 | Rectifier diode temperature compensation circuit in flyback converter |
-
2012
- 2012-03-12 CN CN2012100618289A patent/CN102612228A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221450A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Constant temperature equipment for instrument |
| CN101605412A (en) * | 2009-07-17 | 2009-12-16 | 罗宏基 | The LED electrified light emitting circuit |
| CN201706260U (en) * | 2010-05-11 | 2011-01-12 | 浙江金中机电科技有限公司 | LED lamp capable of changing color temperature and brightness |
| CN202068621U (en) * | 2011-04-22 | 2011-12-07 | 中山市诚创电器有限公司 | High power light emitting diode (LED) high efficiency driving power supply |
| CN102290995A (en) * | 2011-07-16 | 2011-12-21 | 西安电子科技大学 | Rectifier diode temperature compensation circuit in flyback converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102259A (en) * | 2016-08-18 | 2016-11-09 | 张银月 | A kind of LED overheat step-down circuit |
| CN106793312A (en) * | 2016-12-29 | 2017-05-31 | 伊戈尔电气股份有限公司 | A kind of H bridges switch colour temperature circuit |
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN112600425A (en) * | 2020-12-02 | 2021-04-02 | 南京民联仪器制造有限公司 | Low-current controllable rectifier working in ultralow-frequency dielectric loss measuring device and rectification control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7772782B2 (en) | Light emitting diode (LED) driving device | |
| CN103327694B (en) | Silicon controlled dimming LED drive circuit | |
| CN105337485B (en) | Circuit of power factor correction, LED driving circuit and lighting apparatus | |
| CN103917028A (en) | LED constant-current source and control method thereof | |
| CN104427700B (en) | Overheating protection circuit, LED drive circuit and lamps and lanterns | |
| CN102143629B (en) | high-voltage monolithic integrated circuit (XL5002) for driving LED (light-emitting diode) lamp | |
| CN102612228A (en) | LED (Light-emitting Diode) constant-current and constant-temperature driving power supply | |
| US20130033110A1 (en) | Power supply circuit with low-voltage control and producing method thereof | |
| CN103096595B (en) | Light emitting diode (LED) drive circuit | |
| CN202475890U (en) | Constant-current constant-temperature driving power supply for LEDs (light-emitting diodes) | |
| CN108879982B (en) | Bistable primary side constant-current magnetic induction coupling wireless charging device and use method thereof | |
| KR20140104196A (en) | Power supply circuit for light emitting diode lighting | |
| CN202907285U (en) | Constant current LED power supply with temperature compensation function | |
| CN204598404U (en) | A kind of LED dimming power source | |
| US9179523B1 (en) | Start-up voltage for solid-state lighting controller | |
| CN203827572U (en) | LED constant current source | |
| CN206993457U (en) | A kind of adjustable LED control circuit of voltage | |
| CN202276530U (en) | Light-emitting diode (LED) constant current driving power supply capable of precisely regulating protection power | |
| CN204392660U (en) | Frequency modulation LED power | |
| CN106817806B (en) | A kind of controllable silicon light modulation gamut is without stroboscopic circuit | |
| KR100959376B1 (en) | Power supply for led traffic light able to adjust brightness | |
| CN205596403U (en) | Rail vehicle carriage LED lighting driver power | |
| CN205610981U (en) | Silicon controlled rectifier ball bubble lamp circuit | |
| CN205176685U (en) | Adopt bridge rectifier to pile temperature -control circuit of rectification design | |
| CN204190974U (en) | Single-stage PFC isolated form former limit feedback LED Drive and Control Circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120725 |