CN108495416B - LED constant-current driving temperature protection chip and LED lamp - Google Patents
LED constant-current driving temperature protection chip and LED lamp Download PDFInfo
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- CN108495416B CN108495416B CN201810354547.XA CN201810354547A CN108495416B CN 108495416 B CN108495416 B CN 108495416B CN 201810354547 A CN201810354547 A CN 201810354547A CN 108495416 B CN108495416 B CN 108495416B
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- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention relates to an LED constant current driving temperature protection chip, which comprises a power input circuit, a peak current sampling circuit, a peak current comparison circuit, a trigger circuit, a power switch tube and an over-temperature protection circuit, wherein the power input circuit is connected with the peak current sampling circuit; the over-temperature protection circuit is connected with the peak current comparison circuit, the over-temperature protection circuit is used for being connected with an external second resistor, a temperature protection reference value of the temperature protection circuit corresponds to the resistance value of the second resistor, when the over-temperature protection circuit detects that the temperature exceeds the temperature protection reference value, a signal is sent to the peak current comparison circuit, the peak current comparison circuit is controlled to send a signal to the trigger circuit, and the trigger circuit controls the power switch tube to be in an off state.
Description
Technical Field
The invention relates to an LED constant current driving circuit, in particular to an LED constant current driving temperature protection chip and an LED lamp.
Background
Along with the understanding of people on illumination, further improvement of illumination requirements and quality and the rising of cost of raw materials in recent years, a common traditional illumination scheme cannot meet market demands more and more, and is mainly reflected in the fact that raw material manufacturers reduce quality margin for reducing cost, and the problems of pursuing higher cost performance, limit design, LED lamp heat dissipation and the like in the scheme design of terminal application clients are opposed, so that the problems are fundamentally solved, the service life of the lamp is prolonged, and the structure, the material, the control mode and the like of the lamp are required to be further improved.
When the conventional LED bulb is used in a down lamp environment, the environment temperature in the LED bulb exceeds a safety set value due to the fact that the internal space of the down lamp in indoor illumination is small, the LED light source is early-stage light attenuation due to overheat and even the lamp is dead, heat generated when the LED light source works is automatically accumulated to a lamp holder due to hot air flow, so that the service life of an electrolytic capacitor on a driver is reduced, the failure such as roof leakage and the like is caused, the service life of the LED driver is seriously influenced, the temperature detection is realized by connecting an NTC (negative temperature coefficient) with a functional pin of an enabling IC (integrated circuit) to realize the regulation of the output current, the power is reduced, the reduction of the temperature is realized, but the error range of using the NTC or the PTC is large, the cost is high, the repeated test temperature is required for value setting, the thermistors with different values are selected, the workload of experimental test is increased due to the fact that the thermistors are nonlinear elements, and the repeated experiment is required for different lamp sizes due to different environments.
Disclosure of Invention
Based on the above, the invention aims to provide the LED constant current driving temperature protection chip, which can determine the temperature protection reference value of the LED lamp through the resistance value of the external common resistor, saves the cost and is suitable for various application scenes.
The invention is realized by the following scheme:
the utility model provides a LED constant current drive temperature protection chip which characterized in that: the power supply comprises a power supply input circuit, a peak current sampling circuit, a peak current comparison circuit, a trigger circuit, a power switch tube and an over-temperature protection circuit;
one end of the power switch tube is connected with the LED lamp main loop, and is controlled to be turned on or turned off by the trigger circuit;
the peak current sampling circuit is connected with the power switch tube and the peak current comparison circuit and is used for detecting the peak current of the LED main loop and outputting the peak current to the peak current comparison circuit;
The peak current comparison circuit is connected with the trigger circuit, receives a peak current signal of the LED main loop detected by the peak current sampling circuit, compares the peak current signal with a preset threshold value, and sends a reset signal to the trigger circuit when the peak current signal reaches the threshold value;
The reset end of the trigger circuit receives the reset signal of the peak current comparison circuit and controls the power switch tube to be turned off;
the over-temperature protection circuit is connected with the peak current comparison circuit, the over-temperature protection circuit determines a temperature protection reference value according to the resistance value of the external second resistor, and when the over-temperature protection circuit detects that the temperature exceeds the temperature protection reference value, a signal is sent to the peak current comparison circuit, the peak current comparison circuit is controlled to send a reset signal to the trigger circuit, and the trigger circuit controls the power switch tube to be turned off;
The power switch circuit comprises a peak current comparison circuit, a first logic and circuit and a first timer, wherein the first timer is used for setting the maximum conduction time of the power switch tube, the first input end of the first logic and circuit is connected with the output end of the peak current comparison circuit, the second input end of the first logic and circuit is connected with the output end of the first timer, and the output end of the first logic and circuit is connected with the reset end of the trigger circuit;
The power switch further comprises a zero current detection circuit, wherein the zero current detection circuit sends a setting signal to the trigger circuit and controls the power switch tube to be conducted;
The power switch circuit further comprises a second logic and circuit and a second timer, wherein the second timer is used for setting the maximum turn-off time of the power switch tube, the first input end of the second logic and circuit is connected with the output end of the zero current detection circuit, the second input end of the second logic and circuit is connected with the output end of the second timer, and the output end of the second logic and circuit is connected with the setting end of the trigger circuit.
The LED constant-current driving temperature protection chip can determine the temperature protection reference value of the LED lamp through the resistance value of the external common resistor, has low cost and can be suitable for various application scenes.
Further, the temperature protection reference value of the temperature protection circuit corresponds to the resistance value of the second resistor one by one, and different temperature protection reference values correspond to different resistance values of the second resistor. The external resistor to be selected can be flexibly determined according to the temperature protection reference value.
Further, the different temperature protection reference values of the temperature protection circuit correspond to different resistance ranges of the second resistor.
The invention further provides an LED constant current driving temperature protection circuit, which comprises a power supply circuit, an output terminal, an inductor, a diode, an LED lamp panel, an LED constant current driving temperature protection chip and a first resistor, wherein the power supply circuit, the output terminal and the inductor are sequentially connected in series; and the over-temperature protection circuit of the LED constant-current driving temperature protection chip is connected with the second resistor.
Further, the power supply circuit comprises a rectifier bridge and a filter capacitor, and the filter capacitor is connected with the rectifier bridge in parallel.
Further, the output terminal is connected in parallel with a capacitor.
The invention further provides an LED lamp, which comprises a lamp shade, a light source plate, a driving plate, a shell and a lamp cap, wherein the driving plate is connected with the light source plate, the driving plate and the light source plate are arranged in an inner space defined by the lamp shade and the shell, and any one of the LED constant-current driving temperature protection chips is arranged on the driving plate.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a block diagram of an LED constant current drive temperature protection circuit of the present invention;
FIG. 2 is a block diagram of an LED constant current driving temperature protection chip of the present invention;
fig. 3 is a schematic structural diagram of an LED lamp according to the present invention.
Detailed Description
Referring to fig. 1, the LED constant current driving temperature protection circuit described in fig. 1 can realize constant current control and temperature protection of an LED lamp under the condition of low cost, and can set different temperature protection reference values according to different external resistance values. The LED main loop of the circuit comprises a power circuit, an output terminal and an inductor L which are sequentially connected in series, and also comprises an LED constant current driving temperature protection chip IC, wherein the power circuit comprises a rectifier bridge VC and an electrolytic capacitor C1, and an input voltage AC is converted into a smooth pulsating direct current voltage after being subjected to bridge rectification and being filtered by the electrolytic capacitor C1; the output terminal is connected in parallel with the diode D1 in a serial circuit of the inductor L, the output terminal is connected in parallel with the capacitor C2, one end of the inductor L is connected with the output terminal, and the other end is connected with a DRAIN pin of the constant current driving temperature protection chip IC.
Referring to fig. 2, fig. 2 is a block diagram of an LED constant current driving temperature protection chip IC, where the LED constant current driving temperature protection chip IC includes a power input circuit, a peak current sampling circuit, a peak current comparing circuit, a trigger circuit, a power switch tube, a zero current detecting circuit and an over-temperature protection circuit, and the IC includes six pins: DRAIN, ISEN, VIN, RTH, ROVP and GND pins.
The power input circuit is connected with the rectified and filtered voltage from the LED main circuit and is provided with a built-in direct current voltage stabilizing tube, and the power input circuit supplies power to each circuit of the chip after being stabilized by the direct current voltage stabilizing tube.
The DRAIN electrode of the power switch tube VG is connected with the inductance L of the LED main loop through the DRAIN pin, the source electrode of the power switch tube VG is connected with the ISEN pin, the ISEN pin is grounded through an external first resistor R1, and after the power switch tube VG is conducted, the DRAIN pin is conducted with the ISEN pin.
The ISEN pin is also connected with the comparator to form a peak current sampling circuit, and when the LED main loop circuit reaches peak current, the peak current sampling circuit acquires the voltage at the ISEN pin and sends the voltage value to the peak current comparison circuit.
The peak current comparison circuit comprises the comparator connected with the ISEN pin, the input end of the comparator receives the voltage value acquired by the peak current sampling circuit and compares the voltage value with a set threshold voltage value, wherein the threshold voltage value is set to be the voltage value formed on the first resistor R1 when the LED main circuit reaches the peak current, in the embodiment, 400mV is adopted, and when the acquired voltage value is larger than the set threshold voltage value, the comparator outputs a reset signal to the trigger circuit to drive the power switch tube to be turned off.
The trigger circuit comprises an RS trigger, wherein a reset end of the RS trigger receives a reset signal sent by the comparator, sends the signal to the power switch tube and drives the power switch tube to be turned off; after detecting zero current, the zero current detection circuit ZCD sends a signal to the setting end of the RS trigger to set the RS trigger, and the power switch tube is driven to be conducted after the RS trigger is set.
The over-temperature protection circuit OTP is connected with an RTH pin, the RTH pin can output constant current and is grounded through an external second resistor R2, wherein the over-temperature protection circuit OTP detects voltage values at two ends of the second resistor R2, different temperature protection reference values are arranged in the over-temperature protection circuit OTP, a specific value of the protection reference value is determined by judging the voltage values at two ends of the second resistor R2, namely the temperature protection reference value of the over-temperature protection circuit OTP corresponds to the resistance value of the second resistor R2, the corresponding relation can be one-to-one correspondence of linear proportion or one-to-one correspondence of other forms, so that different temperature protection reference values correspond to different resistance values, or the temperature protection reference value is divided into a plurality of different temperature protection sections, a certain temperature protection reference value corresponding to the same temperature protection section is set, and different resistance value ranges correspond to the temperature protection reference values of different temperature protection sections; the over-temperature protection circuit OTP is connected with the comparator, when the over-temperature protection circuit OTP detects that the temperature of the chip is greater than the temperature protection reference value, a signal is sent to the comparator, so that the comparator outputs a signal to reset the RS trigger, the power switch tube is driven to be turned off, the current of the LED main loop is reduced and the power is reduced by increasing the turn-off time of the power switch tube, wherein different turn-off times can be set according to different temperature protection reference values, the higher the temperature protection reference value is, the longer the turn-off time is, and the current and the power amplitude of the LED main loop are reduced.
The LED constant current driving temperature protection chip IC is also internally provided with a first timer and a first logic and circuit, wherein a first timer set value Tonmax is the maximum conduction time of the power switch tube, the input ends of the first logic and circuit are respectively connected with the output end of the comparator and the output end of the first timer, the output ends of the first logic and circuit are connected with the reset end of the RS trigger, and if the peak current sampling circuit does not collect the peak current within Tonmax time after the power switch tube is conducted, the first timer acts to drive the RS trigger to turn off the power switch tube.
The LED constant current driving temperature protection chip IC is also internally provided with a second timer and a second logic and circuit, the set value Toffmax of the second timer is the maximum turn-off time of the power switch tube, namely the maximum demagnetizing time of the inductor L, the input ends of the second logic and circuit are respectively connected with the zero current detection circuit and the output end of the second timer, the output end of the second logic and circuit is connected with the set end of the RS trigger, and if the zero current detection circuit does not collect zero current within Toffmax time after the power switch tube is turned off, the second timer acts to drive the RS trigger to turn on the power switch tube.
An overvoltage protection module OVP is further arranged in the LED constant current driving temperature protection chip IC, and the overvoltage protection module OVP is connected with a ROVP pin of the chip and is grounded through an external resistor R3.
Referring to fig. 3, an LED lamp according to the present invention includes a lamp cap 1, an arc-shaped housing 2, a heat dissipation member 3, a driving board 4, a light source board 5 and a lamp cover 6, wherein the driving board 4 is provided with the LED constant current driving temperature protection chip disclosed in the present invention, and the driving board 4 is connected with the light source board 5 and is disposed in an inner space of the LED lamp enclosed by the housing 2 and the lamp cover 6.
The LED constant current driving temperature protection chip and the circuit can realize constant current control and temperature protection of an LED lamp, can realize setting and changing of a temperature protection reference value through externally connecting resistors with different resistance values, and can be conveniently and flexibly applied to various different occasions, especially occasions with narrow internal space of the LED lamp while solving the problem that the use of a thermistor is high in cost.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. The utility model provides a LED constant current drive temperature protection chip which characterized in that: the power supply comprises a power supply input circuit, a peak current sampling circuit, a peak current comparison circuit, a trigger circuit, a power switch tube and an over-temperature protection circuit;
one end of the power switch tube is connected with the LED lamp main loop, and is controlled to be turned on or turned off by the trigger circuit;
the peak current sampling circuit is connected with the power switch tube and the peak current comparison circuit and is used for detecting the peak current of the LED main loop and outputting the peak current to the peak current comparison circuit;
The peak current comparison circuit is connected with the trigger circuit, receives a peak current signal of the LED main loop detected by the peak current sampling circuit, compares the peak current signal with a preset threshold value, and sends a reset signal to the trigger circuit when the peak current signal reaches the threshold value;
The reset end of the trigger circuit receives the reset signal of the peak current comparison circuit and controls the power switch tube to be turned off;
the over-temperature protection circuit is connected with the peak current comparison circuit, the over-temperature protection circuit determines a temperature protection reference value according to the resistance value of the external second resistor, and when the over-temperature protection circuit detects that the temperature exceeds the temperature protection reference value, a signal is sent to the peak current comparison circuit, the peak current comparison circuit is controlled to send a reset signal to the trigger circuit, and the trigger circuit controls the power switch tube to be turned off;
The power switch circuit comprises a peak current comparison circuit, a first logic and circuit and a first timer, wherein the first timer is used for setting the maximum conduction time of the power switch tube, the first input end of the first logic and circuit is connected with the output end of the peak current comparison circuit, the second input end of the first logic and circuit is connected with the output end of the first timer, and the output end of the first logic and circuit is connected with the reset end of the trigger circuit;
The power switch further comprises a zero current detection circuit, wherein the zero current detection circuit sends a setting signal to the trigger circuit and controls the power switch tube to be conducted;
The power switch circuit further comprises a second logic and circuit and a second timer, wherein the second timer is used for setting the maximum turn-off time of the power switch tube, the first input end of the second logic and circuit is connected with the output end of the zero current detection circuit, the second input end of the second logic and circuit is connected with the output end of the second timer, and the output end of the second logic and circuit is connected with the setting end of the trigger circuit.
2. The LED constant current drive temperature protection chip of claim 1, wherein: the temperature protection reference value of the over-temperature protection circuit corresponds to the resistance value of the second resistor one by one, and different temperature protection reference values correspond to different resistance values of the second resistor.
3. The LED constant current drive temperature protection chip of claim 1, wherein: different temperature protection reference values of the over-temperature protection circuit correspond to different resistance ranges of the second resistor.
4. The utility model provides a LED constant current drive temperature protection circuit, includes power supply circuit, output terminal and the inductance that establishes ties in proper order, still includes the diode that establishes ties mutually with the series circuit that output terminal and inductance formed, output terminal is used for connecting LED lamp plate, its characterized in that: the LED constant current driving temperature protection chip is characterized by further comprising any one of the LED constant current driving temperature protection chips according to claims 1-3, wherein one end of a power switch tube of the LED constant current driving temperature protection chip is connected with the inductor, and the other end of the power switch tube is connected with a first resistor; and the over-temperature protection circuit of the LED constant-current driving temperature protection chip is connected with the second resistor.
5. The LED constant current drive temperature protection circuit of claim 4, wherein: the power supply circuit comprises a rectifier bridge and a filter capacitor, and the filter capacitor is connected with the rectifier bridge in parallel.
6. The LED constant current drive temperature protection circuit of claim 5, wherein: the output terminal is connected in parallel with a capacitor.
7. The utility model provides a LED lamp, includes lamp shade, light source board, drive plate, shell and lamp holder, the drive plate is connected with the light source board, drive plate with the light source board place in the lamp shade with the inner space that the shell encloses, its characterized in that is equipped with arbitrary one kind according to the LED constant current drive temperature protection chip of claims 1 to 3 on the drive plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810354547.XA CN108495416B (en) | 2018-04-19 | 2018-04-19 | LED constant-current driving temperature protection chip and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810354547.XA CN108495416B (en) | 2018-04-19 | 2018-04-19 | LED constant-current driving temperature protection chip and LED lamp |
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| Publication Number | Publication Date |
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| CN108495416A CN108495416A (en) | 2018-09-04 |
| CN108495416B true CN108495416B (en) | 2024-04-23 |
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| CN201810354547.XA Active CN108495416B (en) | 2018-04-19 | 2018-04-19 | LED constant-current driving temperature protection chip and LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111194114B (en) * | 2018-11-13 | 2022-02-18 | 华润微集成电路(无锡)有限公司 | Current control device, working method, constant current driving system and heat balance method |
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