CN212183777U - Power supply over-temperature protection circuit and LED driving power supply - Google Patents
Power supply over-temperature protection circuit and LED driving power supply Download PDFInfo
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- CN212183777U CN212183777U CN202020431997.7U CN202020431997U CN212183777U CN 212183777 U CN212183777 U CN 212183777U CN 202020431997 U CN202020431997 U CN 202020431997U CN 212183777 U CN212183777 U CN 212183777U
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- 238000001514 detection method Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000002955 isolation Methods 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005693 optoelectronics Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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]
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Abstract
The utility model discloses a power supply excess temperature protection circuit and LED drive power supply relates to the electronic circuit field. The circuit comprises a temperature detection module, a voltage detection module and a control module, wherein the temperature detection module is used for converting a temperature value of a power supply into a voltage value; the temperature detection module is connected with the first input end of the first comparison circuit; the reference voltage providing module is connected with the second input end of the first comparison circuit; and the output end of the first comparison circuit is connected with the voltage output end, and the voltage output end is used for being connected with a main control chip. The utility model discloses can satisfy the excess temperature protection of LED drive power supply work under different ambient temperature.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit and specifically relates to a power excess temperature protection circuit and LED drive power supply are related to.
Background
The existing over-temperature protection integrated IC suitable for a high-power driving power supply in the market is quite rare, and the existing integrated IC also has many defects, such as: the integrated over-temperature protection control IC can not really realize the 0% -100% dimming of the PWM duty ratio of the power input end, and generally only can realize 3% or 5% -100%. The following steps are repeated: the integrated IC has relatively few external protection and fine adjustment circuits, and the ideal duty ratio value of the driving power supply cannot be effectively controlled by changing an external device, so that the requirement of the market on over-temperature protection of different power supplies at different environmental temperatures cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a power excess temperature protection circuit and LED drive power supply can play the effect of excess temperature protection.
In a first aspect, an embodiment of the present invention provides a power supply over-temperature protection circuit, including:
the temperature detection module is used for converting the temperature value of the power supply into a voltage value;
the temperature detection module is connected with the first input end of the first comparison circuit;
the reference voltage providing module is connected with the second input end of the first comparison circuit;
and the output end of the first comparison circuit is connected with the voltage output end, and the voltage output end is used for connecting the main control chip so that the main control chip can adjust the output voltage of the main control chip.
The utility model discloses power supply excess temperature protection circuit has following beneficial effect at least: can play the role of over-temperature protection.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments still includes:
and one end of the amplifying circuit is connected with the temperature detection module, and the other end of the amplifying circuit is connected with the first input end of the first comparison circuit.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments, first comparison circuit still includes the double integration circuit, be used for with the voltage value feedback of first comparison circuit's output extremely first comparison circuit's second input.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments still includes bleeder circuit and second comparison circuit, bleeder circuit's one end with reference voltage provides the module and connects, bleeder circuit's the other end with second comparison circuit's first input is connected, second comparison circuit's second input is used for inputing a reference voltage, second comparison circuit's output with voltage output end connects.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments still includes keeps apart transmission circuit, first comparison circuit's output second comparison circuit's output all with keep apart transmission circuit's input and connect, keep apart transmission circuit's output with voltage output end connects.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments, the temperature detection module comprises a negative temperature coefficient thermistor and a divider resistor series connection.
According to other embodiments of the present invention, the power supply over-temperature protection circuit, the first comparison circuit comprises a first operational amplifier.
According to other embodiments of the present invention, the power supply over-temperature protection circuit, the second comparison circuit comprises a second operational amplifier.
According to the utility model discloses a power supply excess temperature protection circuit of other embodiments, amplifier circuit includes the triode, keep apart transmission circuit and include optoelectronic coupler.
In a second aspect, an embodiment of the present invention provides an LED driving power supply, including the power supply over-temperature protection circuit.
Drawings
Fig. 1 is a block diagram of an embodiment of an over-temperature protection circuit of a power supply according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the over-temperature protection circuit of the present invention.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Referring to fig. 1, a block diagram of a power supply over-temperature protection circuit according to an embodiment of the present invention is shown. As shown in fig. 1, the power supply over-temperature protection circuit specifically includes: the device comprises a temperature detection module, a first comparison circuit, a reference voltage providing module and a voltage output end.
The temperature detection module is used for converting the temperature value of the power supply into a voltage value;
the temperature detection module is connected with the first input end of the first comparison circuit;
the reference voltage providing module is connected with the second input end of the first comparison circuit;
and the output end of the first comparison circuit is connected with the voltage output end, and the voltage output end is used for being connected with the main control chip so that the main control chip can adjust the output voltage of the main control chip.
The temperature value of the power supply is detected through the temperature detection module, the temperature value of the power supply is converted into a voltage value, the voltage value is input into the first comparison circuit, the voltage value is compared with the reference voltage, the result is output to the voltage output end, the voltage output end is input into the main control chip, the main control chip controls the duty ratio of the output PWM modulation signal, and the LED driving power supply is enabled to be normally used at the set temperature value.
Furthermore, the power supply over-temperature protection circuit further comprises an amplifying circuit, one end of the amplifying circuit is connected with the temperature detection module, and the other end of the amplifying circuit is connected with a first input end of the first comparison circuit.
In this embodiment, the amplifying circuit includes a transistor for amplifying the voltage value output by the temperature detecting module.
Furthermore, the first comparison circuit further comprises a double-integration circuit, and the double-integration circuit is used for feeding back the voltage value of the output end of the first comparison circuit to the second input end of the first comparison circuit to form a negative feedback closed loop circuit.
In this embodiment, the first comparison circuit includes an operational amplifier.
Furthermore, the power supply over-temperature protection circuit further comprises a voltage division circuit and a second comparison circuit, wherein one end of the voltage division circuit is connected with the reference voltage providing module to divide the reference voltage. The other end of the voltage division circuit is connected with a first input end of a second comparison circuit, a second input end of the second comparison circuit is used for inputting reference voltage, and an output end of the second comparison circuit is connected with a voltage output end.
In this embodiment, the second comparing circuit includes an operational amplifier.
Furthermore, the power supply over-temperature protection circuit further comprises an isolation transmission circuit, the output end of the first comparison circuit and the output end of the second comparison circuit are both connected with the input end of the isolation transmission circuit, and the output end of the isolation transmission circuit is connected with the voltage output end. In this embodiment, keep apart transmission circuit includes optoelectronic coupler, mainly plays the effect of isolation transmission, improves the interference killing feature of circuit.
Furthermore, the temperature detection module is formed by connecting a negative temperature coefficient thermistor and a voltage dividing resistor in series.
Referring to fig. 2, a schematic circuit diagram of an over-temperature protection circuit of a power supply in an embodiment of the present invention is shown. As shown in fig. 2, RT202 is a ntc thermistor, and resistor R249 and resistor R257 are connected in parallel and then connected in series with RT202 to form a temperature detection module.
The operating principle of the circuit diagram of fig. 2 is explained below:
when the LED driving power supply works normally, the voltage at the SVCC end is divided by the resistor R253, so that the drain of the MOS transistor Q201 is at a high level, and the voltage at the V1 point is obtained by a voltage dividing circuit consisting of the zener diode ZD208, the resistor R251, the resistor R252, the capacitor C226, the zener diode ZD206 and the resistor R256 according to the parameter ratio and is used as the reference voltage. The voltage at the point V1 is divided by the resistor R238, the resistor R230, the resistor R263, and the resistor R229 in series, and is input to the 2-pin input terminal of the two-terminal comparator IC201A (second operational amplifier), and the voltage at the 2-pin input terminal is compared with the reference voltage Vref at the upper end of the 3-pin connected resistor R228. If the output signal of pin 1 of the double-ended comparator IC201A is high level, the capacitor C215 is charged, when the capacitor C215 is charged to a certain voltage, the voltage of pin 3 higher than the double-ended comparator IC201A, and because the double-ended comparator IC201A is a negative feedback closed loop, pin 1 outputs a low level after negative feedback action, at this time, the backward diode D202 is turned on, and the SVCC end is always in a high level state and higher than the voltage of point a in the figure, so the photodiode inside the photoelectric coupler U201 is turned on, the voltage signal of point a is fed back to the output end of the photoelectric coupler U201, transmitted to the voltage output end PVCC through the photosensitive resistor RT102 and the resistor R141, and then input to the main control chip, which outputs the voltage VCC, which is connected to the V1. The temperature detection module does not participate in the operation at this time.
When the LED driving power supply works under a special condition, if the working temperature of the LED driving power supply rises, the temperature detection module works, and the specific working process is as follows: when the working temperature of the power supply rises to a set value, the resistance value parameter of the thermistor RT202 is reduced, the resistor R249 and the resistor R257 are connected in parallel and then are connected with the series voltage division circuit of the thermistor RT202 to conduct the triode Q207, so that high level is provided for the base of the triode Q204, and the triode Q204 works normally. The voltage of the 5-pin of the two-terminal comparator IC201B (first operational amplifier) is equal to the voltage dividing ratio of the parallel value of the resistor R257 and the resistor R249 to the voltage dividing ratio of the thermistor RT202 to Vref. The backward diode D213 is turned on, so that the MOS transistor Q201 is turned on. The voltage of the 6 pin of the double-end comparator IC201B is grounded, the voltage value is equal to 0, at this time, the 7 pin output end of the double-end comparator IC201B outputs a high level signal, the high level signal is fed back to the 6 pin of the double-end comparator IC201B through a double integral circuit formed by a resistor R224, a capacitor C220 and a capacitor C216, the 7 pin output is inverted into a low level after negative feedback action, a backward diode D203 is conducted, the conduction angle of a triode is reduced by a light emitting diode in the photoelectric coupler U201 and is fed back to a main control chip through the voltage output end, and therefore the LED driving power supply is turned off by the main control chip, and the purpose of protecting the power supply and other components is.
When the over-temperature phenomenon of the LED driving power supply disappears, the parameter value of the thermistor RT202 returns to normal, so that the triode Q207 is turned off, and the triode Q204 is also turned off because the base reference voltage cannot be obtained. Therefore, the over-temperature protection circuit cannot participate in work, and the LED driving power supply is normally used.
For different ambient temperatures, the resistance of the thermistor RT202 at different temperatures is different. When the ambient temperature is higher, the PVCC input to the main control chip finally can be reduced by combining the circuit principle, and the PWM duty ratio of the main control chip can be changed, so that the change of the output voltage VCC is controlled, the current and the voltage value of the circuit are adjusted, and the requirement on over-temperature protection at different ambient temperatures is met.
In this embodiment, the parameter setting of the components is as follows: if the normal working temperature value of the power supply is set to be 70 ℃, the thermistor RT202 has a corresponding resistance value at 70 ℃. When the LED driving power supply works normally, the parameter values of other resistors and capacitors in the circuit can be accurately set through calculation.
The over-temperature protection circuit in the embodiment can achieve the purpose of over-temperature protection, and the main body framework adopts separated components such as a common diode, a triode, a resistor and a capacitor, so that on one hand, the cost is low, on the other hand, the input end PWM pulse width duty ratio of the LED driving power supply can be adjusted from 0-100% deep range by changing parameters of part of the components, and the current and voltage values of the circuit are accurately controlled.
Further, the embodiment of the utility model also discloses a LED drive power supply, including foretell power supply excess temperature protection circuit.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (9)
1. A power supply over-temperature protection circuit, comprising:
the temperature detection module is used for converting the temperature value of the power supply into a voltage value;
the temperature detection module is connected with the first input end of the first comparison circuit;
the reference voltage providing module is connected with the second input end of the first comparison circuit;
the output end of the first comparison circuit is connected with the voltage output end, and the voltage output end is used for being connected with the main control chip so that the main control chip can adjust the output voltage of the main control chip;
and one end of the amplifying circuit is connected with the temperature detection module, and the other end of the amplifying circuit is connected with the first input end of the first comparison circuit.
2. The power supply over-temperature protection circuit of claim 1, wherein the first comparison circuit further comprises a double integration circuit for feeding back the voltage value of the output terminal of the first comparison circuit to the second input terminal of the first comparison circuit.
3. The power supply over-temperature protection circuit according to claim 2, further comprising a voltage divider circuit and a second comparator circuit, wherein one end of the voltage divider circuit is connected to the reference voltage providing module, the other end of the voltage divider circuit is connected to a first input end of the second comparator circuit, a second input end of the second comparator circuit is used for inputting a reference voltage, and an output end of the second comparator circuit is connected to the voltage output end.
4. The power supply over-temperature protection circuit according to claim 3, further comprising an isolation transmission circuit, wherein the output terminal of the first comparison circuit and the output terminal of the second comparison circuit are both connected to the input terminal of the isolation transmission circuit, and the output terminal of the isolation transmission circuit is connected to the voltage output terminal.
5. The power supply over-temperature protection circuit according to any one of claims 1 to 4, wherein the temperature detection module is composed of a negative temperature coefficient thermistor and a voltage dividing resistor connected in series.
6. The power supply over-temperature protection circuit as claimed in claim 5, wherein the first comparison circuit comprises a first operational amplifier.
7. The power supply over-temperature protection circuit as claimed in claim 4, wherein the second comparison circuit comprises a second operational amplifier.
8. The over-temperature protection circuit of claim 4, wherein the amplifying circuit comprises a triode and the isolation transmission circuit comprises a photocoupler.
9. An LED driving power supply, characterized by comprising the power supply over-temperature protection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020431997.7U CN212183777U (en) | 2020-03-30 | 2020-03-30 | Power supply over-temperature protection circuit and LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020431997.7U CN212183777U (en) | 2020-03-30 | 2020-03-30 | Power supply over-temperature protection circuit and LED driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212183777U true CN212183777U (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020431997.7U Expired - Fee Related CN212183777U (en) | 2020-03-30 | 2020-03-30 | Power supply over-temperature protection circuit and LED driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212183777U (en) |
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2020
- 2020-03-30 CN CN202020431997.7U patent/CN212183777U/en not_active Expired - Fee Related
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Granted publication date: 20201218 |