CN202190434U - LED illuminant circuit employing ceramic PTC for temperature compensation and protection - Google Patents
LED illuminant circuit employing ceramic PTC for temperature compensation and protection Download PDFInfo
- Publication number
- CN202190434U CN202190434U CN2011200667708U CN201120066770U CN202190434U CN 202190434 U CN202190434 U CN 202190434U CN 2011200667708 U CN2011200667708 U CN 2011200667708U CN 201120066770 U CN201120066770 U CN 201120066770U CN 202190434 U CN202190434 U CN 202190434U
- Authority
- CN
- China
- Prior art keywords
- ptc
- led
- circuit
- temperature
- protection
- 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.)
- Expired - Lifetime
Links
Images
Abstract
In an LED illuminant circuit employing ceramic PTC for temperature compensation and protection, a ceramic PTC component possessing a specific temperature coefficient and a volt-ampere characteristic is employed and connected with a plurality of LED light emitting diodes. In a wide temperature scope, the positive temperature coefficient of PTC can compensate the current rise of the LED illuminant circuit caused in that a PN junction voltage is reduced; in a wide voltage scope, the current changed is obviously reduced caused by voltage change; and the PTC possesses both temperature compensation and over-current protection effects, the circuit is simplified, and the cost of the LED illuminant circuit is substantially reduced.
Description
Technical field:
The utility model relates to the application of ceramic PTC element in the LED lighting circuit, more particularly, is to adopt temperature-compensating and the over-current protection device of specific ceramic PTC element as the LED lighting circuit.
Background technology:
Existing LED lighting circuit, the general employing specially connected with the LED light-emitting diode of negative temperature coefficient for the thermistor (positive temperature coefficient) of LED illumination development, with the electric current of steady illumination circuit.The thermistor quantity of the required use of this compensation method is more, and can't eliminate the influence of voltage fluctuation to electric current, need add voltage stabilizing circuit in addition, makes cost up.For the high power semi-conductor illumination, the constant-current drive circuit that generally adopts Switching Power Supply to constitute, cost is also very high.
The utility model content:
The utility model adopts the PTC element with specified temp coefficient and voltage-current characteristic, connects with the LED light-emitting diode of proper number, but the positive temperature coefficient compensation LED of PTC caused electric current rising in very wide temperature range because of PN junction voltage descends; And the electric current that in very wide voltage range, can significantly reduce to cause because of change in voltage changes.That is to say, adopt this PTC element to connect, all can play compensating action, simplified circuit effectively the variation of temperature and voltage with the LED light-emitting diode.The use of can connecting with 30-60 LED diode of a PTC element, and a common temperature-compensating thermistor can only be connected with 5 LED, visible the utility model has been simplified compensating circuit significantly, has reduced cost.
The LED lighting circuit of the utility model; Become with 30-60 LED light-emitting diode series by PTC element with positive temperature characterisitic; It is characterized in that: used ceramic PTC element has specific temperature coefficient and voltage-current characteristic; The Curie temperature of PTC is 120 ℃, and the PTC voltage is between 18V～45V the time, and the electric current of PTC remains in 15MA～20MA scope; PTC two ends parallel connections resistance, be used to adjust the electric current of LED of flowing through.
Description of drawings:
Fig. 1: the LED lighting circuit of doing temperature-compensating and protection with PTC
Fig. 2: the VA characteristic curve of special-purpose PTC element
Fig. 3: adopt PTC to make the LED traffic lights of compensation.
Embodiment:
Below in conjunction with accompanying drawing, specifically describe each item embodiment:
Light-emitting diode is a high-brightness LED, and operating current is 15～20MA.
The PTC element voltage-current characteristic that is adopted is as shown in Figure 2: ordinate is that electric current (MA of unit) abscissa is the voltage (V of unit) at PTC two ends; Curve (4) is the VA characteristic curve of this PTC; Visible by curve: the PTC voltage is between 18V～45V the time; The electric current of PTC remains in 15MA～20MA scope, explains that this PTC has certain constant-current characteristics in the voltage range of broad.This constant-current characteristics makes circuit shown in Figure 1 in the scope range of the fluctuation of voltage of broad, keep running current.The normal working temperature of this circuit is :-10 ℃～60 ℃.
For the LED lighting circuit that higher-wattage requires, can adopt the LED lighting circuit parallel connection shown in many picture groups 1.
Adopt PTC to make the led circuit of temperature-compensating and protection, can drive by the alternating current circuit of 220V, as shown in Figure 3: 56 LED light-emitting diodes (8) series connection; PTC (2) is parallelly connected with resistance (3), connects with LED again, and bridge rectifier (7) is a direct voltage with the alternating current repoussage; In the rectifier input circuit, the connected electric capacity (6) of a 10000P/400, on the electric capacity parallel connection the resistance of 470K/0.25W (5), electric capacity (6) is used to reduce input voltage; The benefit of capacitance decompression is that cost is low; Not power consumption, and certain constant current effect is arranged, be applicable to the low-power circuit step-down.The electric capacity (9) of the output termination 2.2UF/400V of rectifier is used for filtering.
Used light-emitting diode is redness, green or the yellow led diode of high brightness.This circuit can keep LED normally luminous in 198V～256V voltage range, steady operation under the ambient temperature of-10 degree～60 degree.
Claims (3)
1. adopt ceramic PTC to make the LED lighting circuit of temperature-compensating and protection; Become with 30-60 LED light-emitting diode series by PTC element with positive temperature characterisitic; It is characterized in that: used ceramic PTC element has specific temperature coefficient and voltage-current characteristic; The Curie temperature of PTC is 120 ℃, and the PTC voltage is between 18V～45V the time, and the electric current of PTC remains in 15MA～20MA scope; PTC two ends parallel connections resistance, be used to adjust the electric current of LED of flowing through.
2. LED lighting circuit according to claim 1 is characterized in that: can be connected in parallel organizing the led circuit that above-mentioned employing pottery PTC does temperature-compensating and protection, with the higher LED lighting circuit of formation power requirement more.
3. LED lighting circuit according to claim 1; It is characterized in that: above-mentioned employing pottery PTC makes the led circuit of temperature-compensating and protection; Can drive by the alternating current circuit of 220V:, drive the traffic light circuit of connecting with 56 LED by PTC through capacitance decompression and rectifier rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200667708U CN202190434U (en) | 2011-03-09 | 2011-03-09 | LED illuminant circuit employing ceramic PTC for temperature compensation and protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200667708U CN202190434U (en) | 2011-03-09 | 2011-03-09 | LED illuminant circuit employing ceramic PTC for temperature compensation and protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202190434U true CN202190434U (en) | 2012-04-11 |
Family
ID=45921865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200667708U Expired - Lifetime CN202190434U (en) | 2011-03-09 | 2011-03-09 | LED illuminant circuit employing ceramic PTC for temperature compensation and protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202190434U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742884A (en) * | 2014-01-25 | 2014-04-23 | 蒋宏青 | Power-supply-integrated LED fluorescent lamp |
| EP3128390A1 (en) * | 2015-08-07 | 2017-02-08 | NEC Space Technologies, Ltd. | Temperature-compensated voltage divider circuit |
-
2011
- 2011-03-09 CN CN2011200667708U patent/CN202190434U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742884A (en) * | 2014-01-25 | 2014-04-23 | 蒋宏青 | Power-supply-integrated LED fluorescent lamp |
| CN103742884B (en) * | 2014-01-25 | 2016-08-17 | 蒋宏青 | A kind of Power-supply-integraLED LED fluorescent lamp |
| EP3128390A1 (en) * | 2015-08-07 | 2017-02-08 | NEC Space Technologies, Ltd. | Temperature-compensated voltage divider circuit |
| CN106444958A (en) * | 2015-08-07 | 2017-02-22 | 日本电气太空技术株式会社 | Temperature-compensated voltage divider circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110181190A1 (en) | Brightness adjusting circuit for an led lamp | |
| CN201322279Y (en) | Temperature compensated constant current driven LED lighting lamp directly driven through AC power source | |
| CN102036436A (en) | Voltage-regulating current-limiting LED illumination device power supply | |
| CN202190434U (en) | LED illuminant circuit employing ceramic PTC for temperature compensation and protection | |
| TWM485583U (en) | Resistot type light adjusting circuit | |
| CN107660019A (en) | Light source and light emitting module | |
| CN105472818B (en) | A kind of LED illumination circuit | |
| WO2012028088A1 (en) | Method and apparatus for led lighting | |
| CN205510462U (en) | LED lighting circuit | |
| US20200375003A1 (en) | Linear constant-current led drive circuit adaptive to wide voltage range | |
| CN204652745U (en) | A kind of constant current driver circuit for LED | |
| TW201503757A (en) | Light-emitting diode lighting device having multiple driving stages | |
| CN103025007B (en) | Street lamp illuminating device | |
| CN105828490B (en) | A kind of LED energy-saving traffic signal lamps with an automatic light meter | |
| CN104219827A (en) | Active self-adjusting circuit | |
| CN103200729B (en) | Light emitting diode (LED) luminous device directly driven in constant current by alternating current | |
| CN207354672U (en) | A kind of LED power circuit of wireless control | |
| CN207179281U (en) | A kind of Novel LED lamp | |
| CN202617453U (en) | Light-emitting diode (LED) lamp for adjusting color temperature by utilizing pulsation width modulation (PWM) controller | |
| CN207354670U (en) | A kind of controllable silicon light modulation LED drive power circuit | |
| CN205754961U (en) | A kind of LED energy-saving traffic signal lamp with an automatic light meter | |
| CN210274612U (en) | LED driving power supply | |
| KR20190045818A (en) | Light-emitting diode lighting device | |
| CN204652754U (en) | For constant-current control circuit and this display unit of LED display | |
| CN204145835U (en) | A kind of constant current driver circuit for LED with temperature control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120411 |
|
| CX01 | Expiry of patent term |