CN214381507U - LED driver - Google Patents
LED driver Download PDFInfo
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- CN214381507U CN214381507U CN202120605089.XU CN202120605089U CN214381507U CN 214381507 U CN214381507 U CN 214381507U CN 202120605089 U CN202120605089 U CN 202120605089U CN 214381507 U CN214381507 U CN 214381507U
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Abstract
The application relates to an LED driver, which comprises a main AC/DC conversion module, an auxiliary AC/DC conversion module, a power supply output module, a temperature measurement module and a comparison control module; the main AC/DC conversion module and the auxiliary AC/DC conversion module are provided with an alternating current input end and a direct current output end; the power supply output module is provided with an input end and an output end, and the output end is coupled with the LED; the temperature measurement module is used for detecting the temperature of the main AC/DC conversion module and outputting a corresponding detection value, and the detection value is in direct proportion to the temperature of the main AC/DC conversion module; the comparison control module is coupled with the temperature measurement module to receive the detection value and compare the detection value with the reference value; and if the detection value is larger than the reference value, the comparison control module controls the direct current output end of the auxiliary AC/DC conversion module to be coupled with the input end of the power supply output module. When the driver works, if the temperature of the main AC/DC conversion module is too high, the main AC/DC conversion module is switched to the auxiliary AC/DC conversion module to supply power, and the main AC/DC conversion module stops working to reduce the temperature, so that the main AC/DC conversion module is prevented from working in a high-temperature state, and the service life of the driver is prolonged.
Description
Technical Field
The present application relates to the field of semiconductor lighting, and more particularly, to an LED driver.
Background
The light emitting diode, referred to as LED for short, is a commonly used light emitting device that can efficiently convert electrical energy into light energy, and is widely used because it has an outstanding energy saving effect.
In daily use, a proper driver is often required to be configured for the LED, and the driver is used for converting 220V alternating current into low-voltage direct current so as to supply power for the LED; meanwhile, the driver includes an AC/DC conversion module for converting the alternating current into the low-voltage direct current.
In view of the above-described related art, the inventors believe that, when the AC/DC conversion module for rectification generates a large amount of heat and accumulates the heat continuously for a long time, the AC/DC conversion module may be damaged due to an excessively high temperature.
SUMMERY OF THE UTILITY MODEL
In order to improve the service life of the driver, the application provides an LED driver.
The application provides an LED driver, adopts following technical scheme:
an LED driver comprises a main AC/DC conversion module, an auxiliary AC/DC conversion module, a power supply output module, a temperature measurement module and a comparison control module;
the main AC/DC conversion module is provided with an alternating current input end and a direct current output end;
the auxiliary AC/DC conversion module is provided with an alternating current input end and a direct current output end;
the power supply output module is provided with an input end and an output end, and the output end is coupled with the LED;
the temperature measurement module is used for detecting the temperature of the main AC/DC conversion module and outputting a corresponding detection value, and the detection value is in direct proportion to the temperature of the main AC/DC conversion module;
the comparison control module is coupled with the temperature measurement module to receive the detection value and compare the detection value with the reference value;
if the detection value is smaller than or equal to the reference value, the comparison control module controls the direct current output end of the main AC/DC conversion module to be coupled with the input end of the power supply output module;
and if the detection value is larger than the reference value, the comparison control module controls the direct current output end of the auxiliary AC/DC conversion module to be coupled with the input end of the power supply output module.
By adopting the technical scheme, when the main AC/DC conversion module works, if the temperature of the main AC/DC conversion module is too high, the main AC/DC conversion module is switched to the auxiliary AC/DC conversion module to supply power, and stops working to reduce the temperature, so that the main AC/DC conversion module is prevented from working in a high-temperature state, and the service life of the main AC/DC conversion module is prolonged.
Optionally, the comparison control module includes a reference circuit, a comparison circuit and a control circuit;
the reference circuit is used for generating a reference value;
the comparison circuit is coupled with the temperature measurement module and the reference circuit to receive the detection value and the reference value and output a control signal according to the comparison result;
the control circuit is coupled with the comparison circuit to receive the control signal and controls the direct current output end of the main AC/DC conversion module or the direct current output end of the auxiliary AC/DC conversion module to be coupled with the input end of the power supply output module according to the control signal.
By adopting the technical scheme, the setting of the reference value is realized through the reference circuit; the comparison between the detection value and the reference value is completed through a comparison circuit so as to judge whether the temperature of the main AC/DC conversion module is too high or not; and finally, switching to the auxiliary AC/DC conversion module when the temperature of the main AC/DC conversion module is too high is realized through the control circuit.
Optionally, the reference circuit includes a first resistor and a second resistor;
one end of the first resistor is connected with the anode of the power supply, and the other end of the first resistor is grounded after being connected with the second resistor in series;
and the connection part of the first resistor and the second resistor outputs a reference value.
By adopting the technical scheme, the setting of the reference value is completed by selecting the resistance values of the first resistor and the second resistor.
Optionally, the comparison circuit includes a comparator, a non-inverting input terminal of the comparator is coupled to the temperature measurement module to receive the detection value, an inverting input terminal of the comparator is coupled to the reference circuit to receive the reference value, and an output terminal of the comparator outputs the control signal.
By adopting the technical scheme, when the detection value is greater than the reference value, the comparator outputs a high level; when the detection value is smaller than the reference value, the comparator outputs a low level; the control method and the control device realize that corresponding control signals are output according to whether the temperature of the main AC/DC conversion module is too high or not.
Optionally, the control circuit includes a switching triode, a first relay and a second relay;
the base electrode of the switching triode is connected with the output end of the comparator, and the emitting electrode of the switching triode is grounded;
one end of a coil of the first relay is connected with a collector of the switch triode, one end of a normally closed switch of the first relay is connected with a direct current output end of the main AC/DC conversion module, and the other end of the normally closed switch of the first relay is connected with an input end of the power supply output module;
the other end of the coil of the first relay is connected with the positive electrode of the power supply after being connected with the coil of the second relay in series, one end of a normally open switch of the second relay is connected with the direct current output end of the auxiliary AC/DC conversion module, and the other end of the normally open switch of the second relay is connected with the input end of the power supply output module.
By adopting the technical scheme, the switch triode receives the control signal and is switched on or switched off according to the control signal, so that whether the coil of the first relay and the coil of the second relay are electrified or not is controlled, and finally the normally closed switch of the first relay and the normally open switch of the second relay are controlled.
Optionally, the second relay is a power-off delay relay.
By adopting the technical scheme, the coil of the first relay and the coil of the second relay are powered off, so that the power supply of the auxiliary AC/DC conversion module is switched to the power supply of the main AC/DC conversion module; in the switching process, the normally open switch of the second relay is turned off in a delayed mode, and the auxiliary AC/DC conversion module and the main AC/DC conversion module are connected in parallel to supply power, so that the power supply stability is facilitated.
Optionally, the first relay is an energizing delay relay.
By adopting the technical scheme, the coil of the first relay and the coil of the second relay are electrified, so that the power supply of the main AC/DC conversion module is switched to the power supply of the auxiliary AC/DC conversion module; in the switching process, the normally closed switch of the first relay is turned off in a delayed mode, and a state that the main AC/DC conversion module and the auxiliary AC/DC conversion module are connected in parallel and supply power exists, so that stable power supply is facilitated.
Optionally, the temperature measuring module includes a fixed resistor and a thermistor;
one end of the fixed resistor is connected with the positive electrode of the power supply, and the other end of the fixed resistor is connected with the thermistor in series and then is grounded;
and a detection value is output at the joint of the fixed resistor and the thermistor.
By adopting the technical scheme, the resistance value of the fixed resistor is selected, and the resistance value of the thermistor changes along with the temperature change, so that the output of the detection value corresponding to the temperature is realized.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the main AC/DC conversion module works, if the temperature of the main AC/DC conversion module is too high, the main AC/DC conversion module is switched to the auxiliary AC/DC conversion module to supply power, and stops working to reduce the temperature, so that the main AC/DC conversion module is prevented from working in a high-temperature state, and the service life of the main AC/DC conversion module is prolonged.
Drawings
Fig. 1 is a schematic diagram of an LED driver.
Fig. 2 is a circuit diagram of an LED driver.
Description of reference numerals: 1. a voltage reduction module; 2. a main AC/DC conversion module; 3. a secondary AC/DC conversion module; 4. a temperature measuring module; 5. a comparison control module; 51. a reference circuit; 52. a comparison circuit; 53. a control circuit; 6. and a power supply output module.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Referring to fig. 1, an embodiment of the present application discloses an LED driver, which includes a voltage reduction module 1, a main AC/DC conversion module 2, an auxiliary AC/DC conversion module 3, a temperature measurement module 4, a comparison control module 5, and a power supply output module 6.
The voltage reduction module 1 is used for converting 220V alternating current into low-voltage alternating current; the main AC/DC conversion module 2 and the auxiliary AC/DC conversion module 3 are used for converting low-voltage alternating current into low-voltage direct current; the temperature measurement module 4 is used for detecting the temperature of the main AC/DC conversion module 2 and outputting a detection value, and the detection value is increased along with the temperature rise; the comparison control module 5 receives the detection value and compares the detection value with a preset reference value, and the comparison control module 5 controls the main AC/DC conversion module 2 or the auxiliary AC/DC conversion module 3 to be conducted with the power supply output module 6 according to the comparison result; the power supply output module 6 is used for outputting low-voltage direct current to supply power for the LED.
When the temperature of the main AC/DC conversion module 2 is normal, and the detection value is smaller than or equal to the preset value, the comparison control module 5 controls the main AC/DC conversion module 2 to be conducted with the power supply output module 6; when the temperature of the main AC/DC conversion module 2 is too high, and the detection value is larger than the preset value, the comparison control module 5 controls the auxiliary AC/DC conversion module 3 to be conducted with the power supply output module 6, and the main AC/DC conversion module 2 stops working to reduce the temperature.
Referring to fig. 1 and 2, the voltage dropping module 1 includes a transformer; the transformer includes a primary side L1 and a secondary side L2. The two ends of the primary side L1 are coupled with 220V alternating current; the secondary side L2 is coupled to the primary side L1, and the number of turns of the secondary side L2 is smaller than that of the primary side L1, so that low-voltage alternating current is output at two ends of the secondary side L2.
The main AC/DC conversion module 2 comprises a bridge rectifier circuit; the bridge rectifier circuit has pins 1-4. Pin 1 of the bridge rectifier circuit in the main AC/DC conversion module 2 is connected to one end of the secondary side L2, pin 3 is connected to the other end of the secondary side L2, pin 2 is a DC positive electrode, and pin 4 is a DC negative electrode.
The sub AC/DC conversion module 3 includes a bridge rectifier circuit; the bridge rectifier circuit has pins 1-4. Pin 1 of the bridge rectifier circuit in the auxiliary AC/DC conversion module 3 is connected with pin 1 in the main AC/DC conversion module 2; a pin 3 in the auxiliary AC/DC conversion module 3 is connected with a pin 3 in the main AC/DC conversion module 2; a pin 2 in the auxiliary AC/DC conversion module 3 is a direct current anode; the pin 4 in the secondary AC/DC conversion module 3 is a DC negative electrode, and the pin 4 in the secondary AC/DC conversion module 3 is connected to the pin 4 in the main AC/DC conversion module 2.
The temperature measuring module 4 comprises a fixed resistor R0 and a thermistor RT. One end of the fixed resistor R0 is connected with VCC, the other end of the fixed resistor R0 is connected with the thermistor RT in series and then is grounded, and the connection part of the fixed resistor R0 and the thermistor RT outputs a detection value. The thermistor RT is a positive temperature coefficient thermistor.
The comparison control block 5 includes a reference circuit 51, a comparison circuit 52, and a control circuit 53.
The reference circuit 51 is used to generate a reference value. The reference circuit 51 includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected with VCC, the other end of the first resistor is connected with the second resistor in series and then is grounded, and the reference value is output at the connection part of the first resistor R1 and the second resistor R2.
The comparing circuit 52 is coupled to the reference circuit 51 and the temperature measuring module 4, receives and compares the detection value and the reference value, and outputs a control signal according to the comparison result. The comparison module comprises a comparator N1; the non-inverting input end of the comparator N1 is connected with the joint of the fixed resistor R0 and the thermistor RT to receive a detection value; the inverting input end of the comparator N1 is connected with the connection point of the first resistor R1 and the second resistor R2 to receive a reference value; the output of the comparator N1 outputs a control signal.
The control circuit 53 is coupled to the comparison circuit 52, and is responsive to the control signal to control the main AC/DC conversion module 2 or the auxiliary AC/DC conversion module 3 to be conducted with the power output module 6. The control circuit 53 comprises a switching triode Q1, a first relay KM1 and a second relay KM 2; the switching triode Q1 is of a PNP type, the base electrode is connected with the output end of the comparator N1 to receive a control signal, and the emitting electrode is grounded; the first relay KM1 is an electrified delay disconnection relay, one end of a coil of the first relay KM1 is connected with a collector of a triode Q1 tube of a switch, and one end of a normally closed switch KM1-1 of the first relay KM1 is connected with a pin 2 in the main AC/DC conversion module 2;
the second relay KM2 is an outage delay disconnection relay, a coil of the second relay KM2 is connected with VCC after being connected with a coil of the first relay KM1 in series, and one end of a normally open switch KM2-1 of the second relay KM2 is connected with a pin 2 in the auxiliary AC/DC conversion module 3.
And the other end of the normally open switch KM2-1 of the second relay KM2 is connected with the other end of the normally closed switch KM1-1 of the first relay KM 1.
The power supply output module 6 is used for outputting low-voltage direct current to supply power for the LED. The power supply output module 6 comprises a positive electrode connector and a negative electrode connector;
the connection point of the other end of the normally open switch KM2-1 of the second relay KM2 and the other end of the normally closed switch KM1-1 of the first relay KM1 is a positive electrode connector, and the positive electrode connector is used for connecting the positive electrode of the LED; a pin 4 in the main AC/DC conversion module 2 is a negative electrode connector; and the negative electrode connector is used for connecting the negative electrode of the LED.
The implementation principle of the LED driver in the embodiment of the application is as follows: during working, if the temperature of the main AC/DC conversion module 2 is too high, the power is switched to the auxiliary AC/DC conversion module 3 for power supply, the main AC/DC conversion module 2 stops working to reduce the temperature, the main AC/DC conversion module 2 is prevented from working in a high-temperature state, and the service life of the main AC/DC conversion module 2 is prolonged.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. An LED driver, characterized by: the device comprises a main AC/DC conversion module (2), an auxiliary AC/DC conversion module (3), a power supply output module (6), a temperature measurement module (4) and a comparison control module (5);
the main AC/DC conversion module (2) is provided with an alternating current input end and a direct current output end;
the auxiliary AC/DC conversion module (3) is provided with an alternating current input end and a direct current output end;
the power supply output module (6) is provided with an input end and an output end, and the output end is coupled with the LED;
the temperature measuring module (4) is used for detecting the temperature of the main AC/DC conversion module (2) and outputting a corresponding detection value, and the detection value is in direct proportion to the temperature of the main AC/DC conversion module (2);
the comparison control module (5) is coupled with the temperature measurement module (4) to receive the detection value and compare the detection value with the reference value;
if the detection value is smaller than or equal to the reference value, the comparison control module (5) controls the direct current output end of the main AC/DC conversion module (2) to be coupled with the input end of the power supply output module (6);
and if the detection value is larger than the reference value, the comparison control module (5) controls the direct current output end of the auxiliary AC/DC conversion module (3) to be coupled with the input end of the power supply output module (6).
2. An LED driver according to claim 1, wherein: the comparison control module (5) comprises a reference circuit (51), a comparison circuit (52) and a control circuit (53);
the reference circuit (51) is used for generating a reference value;
the comparison circuit (52) is coupled with the temperature measurement module (4) and the reference circuit (51) to receive the detection value and the reference value and output a control signal according to the comparison result;
the control circuit (53) is coupled to the comparison circuit (52) to receive the control signal, and controls the DC output terminal of the main AC/DC conversion module (2) or the DC output terminal of the auxiliary AC/DC conversion module (3) to be coupled to the input terminal of the power supply output module (6) according to the control signal.
3. An LED driver according to claim 2, wherein: the reference circuit (51) comprises a first resistor and a second resistor;
one end of the first resistor is connected with the anode of the power supply, and the other end of the first resistor is grounded after being connected with the second resistor in series;
and the connection part of the first resistor and the second resistor outputs a reference value.
4. An LED driver according to claim 2, wherein: the comparison circuit (52) comprises a comparator, the non-inverting input end of the comparator is coupled with the temperature measurement module (4) to receive the detection value, the inverting input end of the comparator is coupled with the reference circuit (51) to receive the reference value, and the output end of the comparator outputs a control signal.
5. An LED driver according to claim 2, wherein: the control circuit (53) comprises a switching triode, a first relay and a second relay;
the base electrode of the switching triode is connected with the output end of the comparator, and the emitting electrode of the switching triode is grounded;
one end of a coil of the first relay is connected with a collector of a switch triode, one end of a normally closed switch of the first relay is connected with a direct current output end of the main AC/DC conversion module (2), and the other end of the normally closed switch of the first relay is connected with an input end of the power supply output module (6);
the other end of the coil of the first relay is connected with the positive electrode of the power supply after being connected with the coil of the second relay in series, one end of a normally open switch of the second relay is connected with the direct current output end of the auxiliary AC/DC conversion module (3), and the other end of the normally open switch of the second relay is connected with the input end of the power supply output module (6).
6. An LED driver according to claim 5, wherein: the second relay is a power-off delay relay.
7. An LED driver according to claim 5, wherein: the first relay is an electrified delay relay.
8. An LED driver according to claim 1, wherein: the temperature measuring module (4) comprises a fixed resistor and a thermistor;
one end of the fixed resistor is connected with the positive electrode of the power supply, and the other end of the fixed resistor is connected with the thermistor in series and then is grounded;
and a detection value is output at the joint of the fixed resistor and the thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120605089.XU CN214381507U (en) | 2021-03-25 | 2021-03-25 | LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120605089.XU CN214381507U (en) | 2021-03-25 | 2021-03-25 | LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214381507U true CN214381507U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120605089.XU Active CN214381507U (en) | 2021-03-25 | 2021-03-25 | LED driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214381507U (en) |
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2021
- 2021-03-25 CN CN202120605089.XU patent/CN214381507U/en active Active
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