CN215647489U - LED driving power supply and electrical equipment - Google Patents
LED driving power supply and electrical equipment Download PDFInfo
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- CN215647489U CN215647489U CN202121016016.3U CN202121016016U CN215647489U CN 215647489 U CN215647489 U CN 215647489U CN 202121016016 U CN202121016016 U CN 202121016016U CN 215647489 U CN215647489 U CN 215647489U
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses an LED driving power supply and electrical equipment, wherein the LED driving power supply comprises an LED lamp string, a power supply module, an over-temperature protection module and a sampling module, wherein the over-temperature protection module is used for outputting a turn-off signal to the sampling module when the working temperature of the LED driving power supply is higher than a preset temperature and outputting a turn-on signal to the sampling module when the working temperature is lower than the preset temperature; the sampling module is used for switching off according to the switching-off signal or switching on according to the switching-on signal; the power supply module is used for providing output current for the LED lamp string, reduces the output current to first preset current when the sampling module is switched off, increases the output current to second preset current when the sampling module is switched on, so that the output current of the LED driving power supply is adjusted according to the change of temperature to change the output power, and the flexibility of the work of the protection circuit is improved while the over-temperature protection is realized.
Description
Technical Field
The utility model relates to the technical field of LEDs, in particular to an LED driving power supply and electrical equipment.
Background
As shown in fig. 1 and 2, the conventional LED driving power supply adopts over-temperature protection by adding a temperature fuse, and only the position of the fuse is different, one is added between the input terminal and the AD-DC module, and the other is added between the output terminal and the LED light string; when the temperature exceeds a specific value, the temperature fuse is disconnected, and an input or output loop is cut off; the protection mode is simple and effective, but the circuit can not work again after the fuse is disconnected, and the flexibility is low.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the utility model aims to provide an LED driving power supply and an electrical device, which can adjust output current according to temperature change to change output power, and improve the flexibility of the work of a protection circuit while realizing over-temperature protection.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an LED driving power supply comprises an LED lamp string, a power supply module, an over-temperature protection module and a sampling module;
the over-temperature protection module is connected with the sampling module and used for outputting a disconnection signal to the sampling module when the working temperature of the LED driving power supply is higher than a preset temperature and outputting a connection signal to the sampling module when the working temperature is lower than the preset temperature;
the sampling module is used for switching off according to the switching-off signal or switching on according to the switching-on signal;
the power supply module is connected with the LED lamp string and used for providing output current for the LED lamp string, reducing the output current to the first preset current when the sampling module is disconnected, and increasing the output current to the second preset current when the sampling module is connected.
In the over-temperature protection circuit, the over-temperature protection module comprises a temperature detection unit, a driving unit and a switch unit which are sequentially connected;
the temperature detection unit is used for detecting the working temperature of the LED driving power supply, outputting a first detection voltage to the driving unit when the working temperature is higher than the preset temperature, and outputting a second detection voltage to the driving unit when the working temperature is lower than the preset temperature;
the driving unit is used for driving the switch unit to be switched off according to the first detection voltage or driving the switch unit to be switched on according to the second detection voltage.
In the over-temperature protection circuit, the temperature detection unit comprises a first resistor, a capacitor and a thermistor; one end of the first resistor is connected with a power supply end, the other end of the first resistor is connected with one end of the capacitor, one end of the thermistor and the driving unit, and the other end of the capacitor and the other end of the thermistor are both grounded.
In the LED driving power supply, the driving unit comprises a voltage stabilizing diode and a second resistor, the anode of the voltage stabilizing diode is connected with one end of the second resistor, the other end of the second resistor is connected with the switch unit, and the cathode of the voltage stabilizing diode is connected with the other end of the first resistor.
In the LED driving power supply, the switch unit comprises a switch tube, the first end of the switch tube is connected with the other end of the second resistor, the second end of the switch tube is connected with the sampling module, and the third end of the switch tube is grounded.
The LED driving power supply comprises a sampling module, a power module, a switch tube and a LED lamp string, wherein the sampling module comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the negative electrode of the power module and the LED lamp string, the other end of the third resistor is connected with the second end of the switch tube, one end of the fourth resistor is connected with the negative electrode of the power module and the LED lamp string, and the other end of the fourth resistor is grounded.
In the LED driving power supply, the switch tube comprises an MOS tube, the first end of the switch tube is the grid electrode of the MOS tube, the second end of the switch tube is the drain electrode of the MOS tube, and the third end of the switch tube is the source electrode of the MOS tube.
An electrical device comprises the LED driving power supply.
Compared with the prior art, the LED driving power supply and the electrical equipment provided by the utility model comprise an LED lamp string, a power supply module, an over-temperature protection module and a sampling module, wherein the over-temperature protection module is used for outputting a turn-off signal to the sampling module when the working temperature of the LED driving power supply is higher than a preset temperature and outputting a turn-on signal to the sampling module when the working temperature is lower than the preset temperature; the sampling module is used for switching off according to the switching-off signal or switching on according to the switching-on signal; the power supply module is used for providing output current for the LED lamp string, reduces the output current to first preset current when the sampling module is switched off, increases the output current to second preset current when the sampling module is switched on, so that the output current of the LED driving power supply is adjusted according to the change of temperature to change the output power, and the flexibility of the work of the protection circuit is improved while the over-temperature protection is realized.
Drawings
Fig. 1 and 2 are schematic diagrams of a conventional LED driving power supply;
FIG. 3 is a block diagram of an LED driving power supply according to the present invention;
fig. 4 is a schematic circuit diagram of the LED driving power supply provided by the present invention.
Detailed Description
The utility model provides an LED driving power supply and electrical equipment, which can adjust output current according to temperature change, further change output power to achieve the purpose of cooling, and improve flexibility.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 3, an LED driving power supply provided by the present invention includes an LED string 11, a power module 12, an over-temperature protection module 13 and a sampling module 14, where the LED string 11 includes a plurality of light emitting diodes connected in series, in this embodiment, the power module 12 is an AC-DC power module, the AC-DC power module 12 includes an output end and a current detection pin, the output end of the AC-DC power module is connected to an anode of the LED string 11, and the current detection pin of the AC-DC power module is connected to a cathode of the LED string 11; the over-temperature protection module 13 is connected with the sampling module 14, and the sampling module 14 is connected with the cathode of the LED string 11 and the current detection pin of the AC-DC power supply module 12.
In specific implementation, when the LED driving power supply normally works, the AC-DC power supply module 12 converts the input AC power into DC power to supply power to the LED lamp string 11 through the output end, the sampling module 14 connected to the negative electrode of the LED lamp string 11 samples the current flowing through the LED lamp string 11 and outputs a sampling signal to the current detection pin of the AC-DC power supply module 12, and the AC-DC power supply module 12 adjusts the output current according to the sampling signal to realize constant current control.
The over-temperature protection module 13 is configured to output a turn-off signal to the sampling module 14 when the operating temperature of the LED driving power supply is greater than a preset temperature, and output a turn-on signal to the sampling module 14 when the operating temperature is less than the preset temperature, which is equivalent to that the over-temperature protection module 13 controls the sampling loop of the sampling module 14 to be turned off when the operating temperature of the LED driving power supply is greater than the preset temperature, and controls the sampling loop of the sampling module 14 to be turned on when the operating temperature is less than the preset temperature; the power supply module 12 is configured to provide an output current for the LED light string 11, reduce the output current to a first preset current when a sampling loop of the sampling module 14 is turned off, and increase the output current to a second preset current when the sampling loop of the sampling module 14 is turned on, where the first preset current is smaller than the second preset current; when the working temperature of the LED driving power supply is increased to the preset temperature, the sampling loop of the sampling module 14 is disconnected, the output current is reduced, and the corresponding output power is reduced, so that the purpose of cooling is achieved, and over-temperature protection is realized; compared with the conventional over-temperature protection measure adopting a fuse, the over-temperature protection circuit 10 can ensure that the LED driving power supply recovers to normal work after the temperature is reduced, and improves the flexibility of the work of the protection circuit while realizing over-temperature protection.
Further, the over-temperature protection module 13 includes a temperature detection unit 131, a driving unit 132 and a switch unit 133, which are connected in sequence, and the switch unit 133 is further connected to the sampling module 14; the temperature detection unit 131 is configured to detect an operating temperature of the LED driving power supply, output a first detection voltage to the driving unit 132 when the operating temperature is greater than the preset temperature, and output a second detection voltage to the driving unit 132 when the operating temperature is less than the preset temperature; the driving unit 132 is configured to drive the switch unit 133 to be turned off according to the first detection voltage, so as to control the sampling loop of the sampling module 14 to be turned off, or the driving unit 132 drives the switch unit 133 to be turned on according to the second detection voltage, so as to control the sampling loop of the sampling module 14 to be turned on, so as to implement over-temperature protection on the LED driving power supply.
Further, referring to fig. 4, the temperature detecting unit 131 includes a first resistor R1, a capacitor C1, and a thermistor NTC; one end of the first resistor R1 is connected to a power source, the other end of the first resistor R1 is connected to one end of the capacitor C1, one end of the thermistor NTC is connected to the driving unit 132, and the other ends of the capacitor C1 and the thermistor NTC are both grounded, in this embodiment, the first resistor R1 is a voltage dividing resistor, and the capacitor C1 is a filter capacitor C1; the voltage VCC of the power source terminal forms a driving voltage after being divided by the series connection of the first resistor R1 and the thermistor NTC, and filtered by the capacitor C1, and is applied to the driving unit 132 and then to the switching unit 133; when the temperature of the LED driving power is normal, the resistance of the thermistor NTC is very large, the voltage division of the thermistor NTC is large, which is equivalent to obtaining a second detection voltage, and the temperature detection unit 131 outputs the second detection voltage to the driving unit 132; when the temperature of the LED driving power is higher than the preset temperature, the resistance of the thermistor NTC decreases, the divided voltage of the thermistor NTC decreases, and the driving voltage decreases, which is equivalent to obtaining a first detection voltage and outputting the first detection voltage to the driving unit 132, so as to subsequently control the state of the switching unit 133, thereby effectively controlling the on/off of the sampling loop.
Further, the driving unit 132 includes a zener diode ZD1 and a second resistor R2, the anode of the zener diode ZD1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the switching unit 133, and the cathode of the zener diode ZD1 is connected to the other end of the first resistor R1; when the driving voltage output by the temperature detection unit 131 is large enough, that is, the driving voltage is the second detection voltage, the voltage breaks through the zener diode ZD1, the switching unit 133 is driven to be turned on through the second resistor R2, when the driving voltage output by the temperature detection unit 131 becomes small, that is, the driving voltage is the first detection voltage, the voltage does not break through the zener diode ZD1 enough, and at this time, the switching unit 133 is turned off without a corresponding driving voltage, so that the effective control of the switching unit 133 is realized, and the magnitude of the preset temperature can be set by setting the regulated voltage value of the voltage regulator tube, thereby further improving the flexibility of the protection circuit.
Further, the switching unit 133 includes a switching tube Q1, a first end of the switching tube Q1 is connected to the other end of the second resistor R2, a second end of the switching tube Q1 is connected to the sampling module 14, a third end of the switching tube Q1 is grounded, in this embodiment, the switching tube Q1 is a MOS tube, a first end of the switching tube Q1 is a gate of the MOS tube, a second end of the switching tube Q1 is a drain of the MOS tube, and a third end of the switching tube Q1 is a source of the MOS tube; when the second detection voltage is output to the gate of the MOS transistor after passing through the driving unit 132, and the MOS transistor is turned on at this time, the sampling loop of the sampling module 14 is turned on, whereas when the first detection voltage is not enough to break down the zener diode ZD1 to reach the gate of the MOS transistor, the MOS transistor is turned off at this time, the sampling loop of the sampling module 14 is turned off, thereby implementing control of turning on or off the sampling loop by controlling the on or off of the MOS transistor.
Further, the sampling module 14 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the negative electrodes of the power module 12 and the LED light string 11, the other end of the third resistor R3 is connected to the second end of the switching tube Q1, one end of the fourth resistor R4 is connected to the negative electrodes of the power module 12 and the LED light string 11, and the other end of the fourth resistor R4 is grounded; the third resistor R3 and the fourth resistor R4 are sampling resistors, the output current of the AC-DC power supply module 12 is in an inverse proportion relation with the parallel resistance of the two sampling resistors, and the output current can be changed in an equal proportion by changing the parallel resistance of the two sampling resistors, so that the purpose of changing the output power is achieved; when the sampling loop of the sampling module 14 is disconnected, that is, the third resistor R3 is disconnected from the sampling loop, the overall resistance of the sampling resistor becomes large, the output current of the AC-DC power supply module 12 becomes small in equal proportion, the output power becomes small, and the corresponding electrical equipment works to reduce the power, so that the purpose of temperature reduction protection is achieved, and the over-temperature protection is realized.
The utility model also provides electrical equipment which comprises the LED driving power supply, and the LED driving power supply is described in detail above, so that the details are not repeated herein.
In summary, the LED driving power supply and the electrical device provided by the present invention include an LED light string, a power module, an over-temperature protection module and a sampling module, where the over-temperature protection module is configured to output a turn-off signal to the sampling module when a working temperature of the LED driving power supply is greater than a preset temperature, and output a turn-on signal to the sampling module when the working temperature is less than the preset temperature; the sampling module is used for switching off according to the switching-off signal or switching on according to the switching-on signal; the power supply module is used for providing output current for the LED lamp string, reduces the output current to first preset current when the sampling module is switched off, increases the output current to second preset current when the sampling module is switched on, so that the output current of the LED driving power supply is adjusted according to the change of temperature to change the output power, and the flexibility of the work of the protection circuit is improved while the over-temperature protection is realized.
It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (8)
1. The LED driving power supply is characterized by comprising an LED lamp string, a power supply module, an over-temperature protection module and a sampling module;
the over-temperature protection module is connected with the sampling module and used for outputting a disconnection signal to the sampling module when the working temperature of the LED driving power supply is higher than a preset temperature and outputting a connection signal to the sampling module when the working temperature is lower than the preset temperature;
the sampling module is used for switching off according to the switching-off signal or switching on according to the switching-on signal;
the power supply module is connected with the LED lamp string and used for providing output current for the LED lamp string, reducing the output current to the first preset current when the sampling module is disconnected, and increasing the output current to the second preset current when the sampling module is connected.
2. The LED driving power supply according to claim 1, wherein the over-temperature protection module comprises a temperature detection unit, a driving unit and a switch unit which are connected in sequence;
the temperature detection unit is used for detecting the working temperature of the LED driving power supply, outputting a first detection voltage to the driving unit when the working temperature is higher than the preset temperature, and outputting a second detection voltage to the driving unit when the working temperature is lower than the preset temperature;
the driving unit is used for driving the switch unit to be switched off according to the first detection voltage or driving the switch unit to be switched on according to the second detection voltage.
3. The LED driving power supply according to claim 2, wherein the temperature detection unit includes a first resistor, a capacitor, and a thermistor; one end of the first resistor is connected with a power supply end, the other end of the first resistor is connected with one end of the capacitor, one end of the thermistor and the driving unit, and the other end of the capacitor and the other end of the thermistor are both grounded.
4. The LED driving power supply according to claim 3, wherein the driving unit comprises a zener diode and a second resistor, an anode of the zener diode is connected to one end of the second resistor, the other end of the second resistor is connected to the switching unit, and a cathode of the zener diode is connected to the other end of the first resistor.
5. The LED driving power supply according to claim 4, wherein the switch unit comprises a switch tube, a first end of the switch tube is connected to the other end of the second resistor, a second end of the switch tube is connected to the sampling module, and a third end of the switch tube is grounded.
6. The LED driving power supply according to claim 5, wherein the sampling module comprises a third resistor and a fourth resistor, one end of the third resistor is connected to the negative electrodes of the power module and the LED light string, the other end of the third resistor is connected to the second end of the switch tube, one end of the fourth resistor is connected to the negative electrodes of the power module and the LED light string, and the other end of the fourth resistor is grounded.
7. The LED driving power supply according to claim 5, wherein the switching tube comprises an MOS tube, the first end of the switching tube is a gate of the MOS tube, the second end of the switching tube is a drain of the MOS tube, and the third end of the switching tube is a source of the MOS tube.
8. An electric appliance characterized by comprising the LED driving power supply according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121016016.3U CN215647489U (en) | 2021-05-13 | 2021-05-13 | LED driving power supply and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121016016.3U CN215647489U (en) | 2021-05-13 | 2021-05-13 | LED driving power supply and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215647489U true CN215647489U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121016016.3U Active CN215647489U (en) | 2021-05-13 | 2021-05-13 | LED driving power supply and electrical equipment |
Country Status (1)
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|---|---|
| CN (1) | CN215647489U (en) |
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2021
- 2021-05-13 CN CN202121016016.3U patent/CN215647489U/en active Active
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