CN213662018U - LED drive circuit and LED lamp - Google Patents
LED drive circuit and LED lamp Download PDFInfo
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- CN213662018U CN213662018U CN202022161032.3U CN202022161032U CN213662018U CN 213662018 U CN213662018 U CN 213662018U CN 202022161032 U CN202022161032 U CN 202022161032U CN 213662018 U CN213662018 U CN 213662018U
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Abstract
The utility model relates to the technical field of lighting technology, a LED drive circuit and LED lamps and lanterns are provided, LED drive circuit includes: the device comprises a rectification module, a constant current driving module, a switch module and a temperature detection module; the input end of the rectification module is connected with commercial power, and the output end of the rectification module is connected with the anode of the LED light source; the input end of the constant current driving module is connected with the cathode of the LED light source, the output end of the constant current driving module is grounded, and the current control end of the constant current driving module is connected with the first end of the switch module; the second end of the switch module is grounded, and the control end is connected with the output end of the temperature detection module; the temperature detection module is used for detecting the current temperature and controlling the on-off of the switch module according to the detected current temperature; the on-off of the switch module is used for adjusting the driving current of the constant current driving module. The utility model discloses detect the current temperature, when the temperature reaches and predetermines the temperature, switch module switches on, and control constant current drive module falls the electric current in order to reach the cooling, and circuit structure is simple, easily realizes, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of the illumination, especially, relate to a LED drive circuit and LED lamps and lanterns.
Background
An LED (Light Emitting Diode) Light source and the advantages of high efficiency, energy saving, environmental protection, long service life, strong controllability and the like are widely used. Because the LED lamp source can generate heat in the use process, the service life of the LED lamp source can be influenced by overhigh temperature. Therefore, the LED lamp source needs to be provided with an over-temperature protection function, and when the temperature is too high, the current is automatically reduced to protect the LED lamp source.
In the prior art, an LED lamp source adjusts the output current through an over-temperature protection chip to reduce the power and lower the temperature, but the circuit structure is complex and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a LED drive circuit and LED lamps and lanterns are provided to adjust output current through the excess temperature protection chip among the solution prior art, lead to the problem that circuit structure is complicated, with high costs.
The embodiment of the utility model provides a first aspect provides a LED drive circuit, include: the device comprises a rectification module, a constant current driving module, a switch module and a temperature detection module;
the input end of the rectification module is connected with commercial power, and the output end of the rectification module is connected with the anode of the LED light source;
the input end of the constant current driving module is connected with the cathode of the LED light source, the output end of the constant current driving module is grounded, and the current control end of the constant current driving module is connected with the first end of the switch module;
the second end of the switch module is grounded, and the control end is connected with the output end of the temperature detection module;
the temperature detection module is used for detecting the current temperature and controlling the on-off of the switch module according to the detected current temperature; the on-off of the switch module is used for adjusting the driving current of the constant current driving module.
Optionally, the temperature detection module includes: the circuit comprises a thermistor, a first voltage stabilizing diode, a first resistor, a second resistor, a third resistor and a first capacitor;
the cathode of the first voltage stabilizing diode is respectively connected with the first end of the first resistor, the first end of the second resistor, the first end of the thermistor and the first end of the first capacitor, and the anode of the first voltage stabilizing diode is grounded;
the second end of the thermistor and the first end of the third resistor are both connected with the output end of the temperature detection module;
the second end of the first resistor is connected with a first power supply end;
the second end of the second resistor, the second end of the first capacitor and the second end of the third resistor are all grounded.
Optionally, the temperature detection module further includes: a second zener diode;
and the anode of the second voltage stabilizing diode is connected with the output end of the temperature detection module, and the cathode of the second voltage stabilizing diode is respectively connected with the second end of the thermistor and the first end of the third resistor.
Optionally, the switch module includes: the first switch tube, the fourth resistor and the fifth resistor;
the first end of the first switch tube is connected with the first end of the switch module through a fourth resistor, the second end of the first switch tube is connected with the second end of the switch module, and the control end of the first switch tube is respectively connected with the control end of the switch module and the first end of the fifth resistor;
and the second end of the fifth resistor is connected with the second end of the switch module.
Optionally, the rectifying module includes: a rectifier bridge and a one-way conduction element;
the input end of the rectifier bridge is connected with the mains supply, and the output end of the rectifier bridge is connected with the anode of the one-way conduction element;
the cathode of the one-way conduction element is connected with the output end of the rectification module.
Optionally, the constant current driving module includes: the constant current driving chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor and a third capacitor;
the enabling end of the constant current driving chip is connected with the first end of the seventh resistor, the power input end of the constant current driving chip is respectively connected with the input end of the constant current driving module, the first end of the second capacitor and the first end of the eighth resistor, the grounding end of the constant current driving chip is grounded, the high-voltage input end of the constant current driving chip is connected with the first end of the ninth resistor, the current detection end of the constant current driving chip is grounded through the sixth resistor, and the compensation end of the constant current driving chip is respectively connected with the current control end of the constant current driving;
the second end of the seventh resistor is connected with the anode of the one-way conduction element, and the second end of the eighth resistor and the second end of the ninth resistor are both connected with the cathode of the one-way conduction element;
the second end of the second capacitor and the second end of the third capacitor are both grounded.
Optionally, the first power terminal is connected to a cathode of the unidirectional conducting element.
Optionally, the LED driving circuit further includes: a stroboscopic removal module;
and the input end of the stroboscopic removing module is connected with the output end of the rectifying module, and the output end of the stroboscopic removing module is connected with the anode of the LED light source.
Optionally, the stroboscopic removing module includes: the second switch tube, the third voltage stabilizing diode and the fourth capacitor;
and a first end of the second switch tube is connected with a cathode of the third voltage stabilizing diode and an input end of the stroboscopic removing module respectively, a second end of the second switch tube is connected with an output end of the stroboscopic removing module and a first end of the fourth capacitor respectively, and a control end of the second switch tube is connected with an anode of the third voltage stabilizing diode and a second end of the fourth capacitor respectively.
The embodiment of the utility model provides a second aspect provides a LED lamp, include: an LED light source and any one of the LED drive circuits of the first aspect of the embodiments of the present invention;
the LED driving circuit is used for driving the LED light source to emit light.
The embodiment of the utility model provides a LED drive circuit, include: the device comprises a rectification module, a constant current driving module, a switch module and a temperature detection module; the input end of the rectification module is connected with commercial power, and the output end of the rectification module is connected with the anode of the LED light source; the input end of the constant current driving module is connected with the cathode of the LED light source, the output end of the constant current driving module is grounded, and the current control end of the constant current driving module is connected with the first end of the switch module; the second end of the switch module is grounded, and the control end is connected with the output end of the temperature detection module; the temperature detection module is used for detecting the current temperature and controlling the on-off of the switch module according to the detected current temperature; the on-off of the switch module is used for adjusting the driving current of the constant current driving module. The utility model discloses detect the current temperature, when the temperature reaches and predetermines the temperature, switch module switches on, draws down constant current drive module's drive current in order to reach the cooling, and circuit structure is simple, easily realizes, and is with low costs.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic circuit structure diagram of an LED driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an LED driving circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, the utility model discloses the implementation provides a LED driving circuit, include: the device comprises a rectification module 11, a constant current driving module 12, a switch module 13 and a temperature detection module 14;
the input end of the rectification module 11 is connected with the mains supply, and the output end of the rectification module is connected with the anode of the LED light source 15;
the input end of the constant current driving module 12 is connected with the cathode of the LED light source 15, the output end of the constant current driving module is grounded, and the current control end of the constant current driving module is connected with the first end of the switch module 13;
the second end of the switch module 13 is grounded, and the control end is connected with the output end of the temperature detection module 14;
the temperature detection module 14 is used for detecting the current temperature and controlling the on-off of the switch module 13 according to the detected current temperature; the on/off of the switch module 13 is used for adjusting the driving current of the constant current driving module 12.
The embodiment of the utility model provides an in, temperature detection module 14 is used for detecting current temperature (for example, temperature detection module 14 can detect the temperature through thermistor NTC), and temperature detection module 14 sends the on-off control signal to switch module 13 according to the current temperature that obtains that detects, and the on-off control signal is used for controlling switch module 13's break-make, through switch module 13's break-make in order to adjust the drive current of constant current drive module 12. For example, when the current temperature reaches the preset temperature, the switch module 13 is turned on, the driving current of the constant current driving module 12 is pulled down, the power is reduced, and thus the temperature is reduced. The utility model discloses the implementation provides a LED drive circuit simple structure, easily realize, with low costs.
In some embodiments, referring to fig. 2, the temperature detection module 14 may include: the circuit comprises a thermistor NTC, a first voltage stabilizing diode ZD1, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1;
a first zener diode ZD1 having a cathode connected to the first end of the first resistor R1, the first end of the second resistor R2, the first end of the thermistor NTC, and the first end of the first capacitor C1, respectively, and an anode grounded;
the second end of the thermistor NTC and the first end of the third resistor R3 are both connected with the output end of the temperature detection module 14;
a second terminal of the first resistor R1 is connected to a first power supply terminal;
the second terminal of the second resistor R2, the second terminal of the first capacitor C1, and the second terminal of the third resistor R3 are all grounded.
In some embodiments, the thermistor NTC may be a negative temperature coefficient thermistor.
In some embodiments, the temperature detection module 14 may further include: a second zener diode ZD 2;
an anode of the second zener diode ZD2 is connected to the output terminal of the temperature detecting module 14, and a cathode of the second zener diode ZD2 is connected to the second terminal of the thermistor NTC and the first terminal of the third resistor R3, respectively.
In some embodiments, the switch module 13 may include: the first switch tube Q1, the fourth resistor R4 and the fifth resistor R5;
a first switch tube Q1, a first end of which is connected to the first end of the switch module 13 through a fourth resistor R4, a second end of which is connected to the second end of the switch module 13, and a control end of which is connected to the control end of the switch module 13 and the first end of a fifth resistor R5, respectively;
a second terminal of the fifth resistor R5 is connected to a second terminal of the switch module 13.
In some embodiments, the first switch Q1 may be an NPN transistor.
Since the voltage across the first zener diode ZD1 does not change, the voltage at the first terminal of the thermistor NTC does not change. When the temperature rises, the resistance of the thermistor NTC decreases, the voltage at the second terminal of the thermistor NTC increases, and the voltage at the base of the first switching tube Q1 increases. When the temperature reaches the preset temperature, the voltage at the base of the first switch Q1 is high enough to turn on the first switch Q1, so as to pull down the driving current of the constant current driving module 12. The embodiment of the utility model provides an in, can be according to the actual application demand through the preset temperature value of the resistance adjustment of adjustment third resistance R3.
In some embodiments, the rectifier module 11 may include: a rectifier bridge BD1 and a unidirectional conductive element D1;
the input end of the rectifier bridge BD1 is connected with the mains supply, and the output end of the rectifier bridge BD1 is connected with the anode of the one-way conduction element D1;
the cathode of the one-way conduction element D1 is connected to the output terminal of the rectifier module 11.
In some embodiments, the rectifier module 11 may further include: fuse element FR1 and varistor RV 1;
the fuse element FR1 is connected in series between the live line and the rectifier bridge BD 1;
and the first end of the piezoresistor RV1 is connected with the output end of the rectifier bridge BD1, and the second end of the piezoresistor RV1 is grounded.
In some embodiments, the rectifier module 11 may further include: a sixth capacitance C6;
a first end of the sixth capacitor C6 is connected to the cathode of the unidirectional conductive element D1, and a second end thereof is grounded.
In some embodiments, the constant current driving module 12 may include: the constant current driving circuit comprises a constant current driving chip U1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2 and a third capacitor C3;
a constant current driving chip U1, wherein an enable end (pin 3) is connected with a first end of a seventh resistor R7, a power input end (pin 4) is respectively connected with an input end of the constant current driving module 12, a first end of a second capacitor C2 and a first end of an eighth resistor R8, a ground end is grounded, a high-voltage input end (pin 5) is connected with a first end of a ninth resistor R9, a current detection end (pin 6) is grounded through a sixth resistor R6, and a compensation end (pin 8) is respectively connected with a current control end of the constant current driving module 12 and a first end of a third capacitor C3;
a second end of the seventh resistor R7 is connected to the anode of the unidirectional conducting device D1, and a second end of the eighth resistor R8 and a second end of the ninth resistor R9 are both connected to the cathode of the unidirectional conducting device D1;
the second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are both grounded.
The embodiment of the utility model provides an in, switch module 13's first end is connected with constant current driver chip U1's compensation end (8 feet), and when LED lamp source high temperature, thermistor NTC resistance reduces, and first switch tube Q1 switches on, draws current from constant current driver chip U1's compensation end to make constant current driver chip U1's drive current reduce, also the electric current that also is LED light source 15 reduces, and the temperature reduces. On the contrary, the temperature decreases, the resistance of the thermistor NTC increases, the first switching tube Q1 is turned off, and the current drop stops, so that the temperature of the LED light source 15 is stabilized within a certain range.
In some embodiments, the first power terminal is connected to the cathode of the one-way conducting element D1.
In some embodiments, the LED driving circuit may further include: a stroboscopic removal module 16;
and the input end of the stroboscopic removing module 16 is connected with the output end of the rectifying module 11, and the output end of the stroboscopic removing module is connected with the anode of the LED light source 15.
In some embodiments, the stroboscopic removal module 16 may include: a second switching tube Q2, a third zener diode ZD3 and a fourth capacitor C4;
a second switch tube Q2, a first end of which is connected to the cathode of the third zener diode ZD3 and the input end of the stroboscopic removal module 16, a second end of which is connected to the output end of the stroboscopic removal module 16 and the first end of the fourth capacitor C4, and a control end of which is connected to the anode of the third zener diode ZD3 and the second end of the fourth capacitor C4.
In some embodiments, the second switch Q2 may be a NOMS transistor.
The third zener diode ZD3 and the fourth capacitor C4 enable the voltage between the gate and the drain of the second switch Q2 to be kept constant, so that the second switch Q2 has a constant current characteristic, and can filter out current ripple and prevent stroboflash.
In some embodiments, the LED driving circuit may further include: a fifth capacitance C5;
and a fifth capacitor C5, having a first end connected to the input end of the stroboscopic removing module 16 and a second end connected to the cathode of the LED light source 15.
In some embodiments, the fifth capacitance C5 may be a polar capacitance;
the positive pole of the fifth capacitor C5 is connected to the input end of the stroboscopic removing module 16, and the negative pole is connected to the negative pole of the LED light source 15.
The fifth capacitor C5 is used to filter out the ripple.
Corresponding to any kind of above-mentioned LED drive circuit, the embodiment of the utility model provides a still provides a LED lamps and lanterns, and this LED lamps and lanterns include: an LED light source and any of the above LED driving circuits;
the LED driving circuit is used for driving the LED light source to emit light.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An LED driving circuit, comprising: the device comprises a rectification module, a constant current driving module, a switch module and a temperature detection module;
the input end of the rectification module is connected with the mains supply, and the output end of the rectification module is connected with the anode of the LED light source;
the input end of the constant current driving module is connected with the cathode of the LED light source, the output end of the constant current driving module is grounded, and the current control end of the constant current driving module is connected with the first end of the switch module;
the second end of the switch module is grounded, and the control end of the switch module is connected with the output end of the temperature detection module;
the temperature detection module is used for detecting the current temperature and controlling the on-off of the switch module according to the detected current temperature; the on-off of the switch module is used for adjusting the driving current of the constant current driving module.
2. The LED driving circuit according to claim 1, wherein the temperature detection module comprises: the circuit comprises a thermistor, a first voltage stabilizing diode, a first resistor, a second resistor, a third resistor and a first capacitor;
the cathode of the first voltage stabilizing diode is respectively connected with the first end of the first resistor, the first end of the second resistor, the first end of the thermistor and the first end of the first capacitor, and the anode of the first voltage stabilizing diode is grounded;
the second end of the thermistor and the first end of the third resistor are both connected with the output end of the temperature detection module;
the second end of the first resistor is connected with a first power supply end;
the second end of the second resistor, the second end of the first capacitor and the second end of the third resistor are all grounded.
3. The LED driving circuit according to claim 2, wherein the temperature detection module further comprises: a second zener diode;
and the anode of the second voltage stabilizing diode is connected with the output end of the temperature detection module, and the cathode of the second voltage stabilizing diode is respectively connected with the second end of the thermistor and the first end of the third resistor.
4. The LED driving circuit according to claim 1, wherein the switching module comprises: the first switch tube, the fourth resistor and the fifth resistor;
the first end of the first switch tube is connected with the first end of the switch module through the fourth resistor, the second end of the first switch tube is connected with the second end of the switch module, and the control end of the first switch tube is respectively connected with the control end of the switch module and the first end of the fifth resistor;
and the second end of the fifth resistor is connected with the second end of the switch module.
5. The LED driving circuit according to claim 1, wherein the rectifying module comprises: a rectifier bridge and a one-way conduction element;
the input end of the rectifier bridge is connected with the mains supply, and the output end of the rectifier bridge is connected with the anode of the one-way conduction element;
and the cathode of the one-way conduction element is connected with the output end of the rectification module.
6. The LED driving circuit according to claim 5, wherein the constant current driving module includes: the constant current driving chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor and a third capacitor;
the enabling end of the constant current driving chip is connected with the first end of the seventh resistor, the power input end of the constant current driving chip is respectively connected with the input end of the constant current driving module, the first end of the second capacitor and the first end of the eighth resistor, the grounding end of the constant current driving chip is grounded, the high-voltage input end of the constant current driving chip is connected with the first end of the ninth resistor, the current detection end of the constant current driving chip is grounded through the sixth resistor, and the compensation end of the constant current driving chip is respectively connected with the current control end of the constant current driving module and the first end of the third;
a second end of the seventh resistor is connected with an anode of the unidirectional conducting element, and a second end of the eighth resistor and a second end of the ninth resistor are both connected with a cathode of the unidirectional conducting element;
and the second end of the second capacitor and the second end of the third capacitor are both grounded.
7. The LED driving circuit according to claim 5, wherein the first power terminal is connected to a cathode of the one-way conducting element.
8. The LED driving circuit according to any one of claims 1 to 7, further comprising: a stroboscopic removal module;
and the input end of the stroboscopic removing module is connected with the output end of the rectifying module, and the output end of the stroboscopic removing module is connected with the anode of the LED light source.
9. The LED driver circuit of claim 8, wherein the de-strobing module comprises: the second switch tube, the third voltage stabilizing diode and the fourth capacitor;
the first end of the second switch tube is connected with the cathode of the third voltage stabilizing diode and the input end of the stroboscopic removing module respectively, the second end of the second switch tube is connected with the output end of the stroboscopic removing module and the first end of the fourth capacitor respectively, and the control end of the second switch tube is connected with the anode of the third voltage stabilizing diode and the second end of the fourth capacitor respectively.
10. An LED lamp, comprising: an LED light source and an LED driver circuit as claimed in any one of claims 1 to 9;
the LED driving circuit is used for driving the LED light source to emit light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022161032.3U CN213662018U (en) | 2020-09-27 | 2020-09-27 | LED drive circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022161032.3U CN213662018U (en) | 2020-09-27 | 2020-09-27 | LED drive circuit and LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN213662018U true CN213662018U (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022161032.3U Active CN213662018U (en) | 2020-09-27 | 2020-09-27 | LED drive circuit and LED lamp |
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|---|---|
| CN (1) | CN213662018U (en) |
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- 2020-09-27 CN CN202022161032.3U patent/CN213662018U/en active Active
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