CN216626104U - LED power control circuit with overload protection - Google Patents
LED power control circuit with overload protection Download PDFInfo
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- CN216626104U CN216626104U CN202122569941.5U CN202122569941U CN216626104U CN 216626104 U CN216626104 U CN 216626104U CN 202122569941 U CN202122569941 U CN 202122569941U CN 216626104 U CN216626104 U CN 216626104U
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- overload protection
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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 an LED power supply control circuit with overload protection, and relates to the technical field of LED control circuits. The overload protection circuit is characterized in that a control terminal CTRL-LOAD is respectively and electrically connected with R1 and R2, the R1 is connected with a luminous LED1 in series and then is grounded to GND, the R2 is respectively and electrically connected with Q1 and Q2, two lines are LED out from R2, one line is connected to the collector of the Q1, the other line is connected to the base of the Q2, the R1 is connected with a luminous LED1 in series and then is connected with R6 in parallel, one end of the R6 is connected between the bases of the R2 and the Q2, the other end of the R6 is grounded to GND, and all elements in the equipment are protected from overcurrent caused by short circuit through reasonable matching of the control chip and peripheral elements of the LED.
Description
Technical Field
The utility model relates to the field of LED control circuits, in particular to an LED power supply control circuit with overload protection.
Background
Overload protection is a protection method in which a protection device is activated when a current flowing through a load exceeds a predetermined maximum value. When the current flowing through the protected original exceeds a preset value, the protection device is started, and the selectivity of action is ensured by time limit, so that the circuit breaker trips or gives an alarm signal. Because the current flowing through the switching triode in the voltage stabilizer is overlarge due to the unexpected condition of overload of the load, the power consumption of the tube is increased, the tube generates heat, and if no overcurrent protection device is arranged, the high-power switching triode can be possibly damaged
The present invention is intended to adopt a new circuit configuration form for promptly stopping the operation of a switching power supply device when a short circuit occurs in an electronic apparatus having an LED to protect each element in the apparatus from an overcurrent due to the short circuit.
SUMMERY OF THE UTILITY MODEL
The utility model provides an LED power supply control circuit with overload protection, and when the LED power supply control circuit is used, a new circuit structure is combined, a control chip and peripheral elements of an LED are reasonably matched, and each element in equipment is protected from overcurrent caused by short circuit.
In order to solve the technical problems, the utility model adopts the following technical scheme: the LED power supply control circuit with the overload protection function is characterized in that a control end CTRL-LOAD of the overload protection circuit is electrically connected with R1 and R2 respectively, the R1 is connected with a luminous LED1 in series and then grounded to GND, the R2 is connected with Q1 and Q2 respectively, two lines are LED out from R2, one line is connected with a collector of Q1, the other line is connected with a base of Q2, the R1 is connected with a luminous LED1 in series and then connected with R6 in parallel, one end of the R6 is connected between bases of R2 and Q2, and the other end of the R6 is grounded to GND.
One end of the emitter of the Q1 is grounded GND, the other end of the emitter is electrically connected with R3, the R3 is connected with R4 in series, and the connecting end between the R3 and the R4 is electrically connected with the emitter of the Q2.
The base of the Q1 is connected with a 5-volt power supply in series after being connected with the R5, the R5 and the R4 of the Q1 are connected in series, and the base of the Q1 is electrically connected with the connecting end between the R5 and the R4.
The utility model provides an LED power supply control circuit with overload protection. The method has the following beneficial effects: the circuit performance is reliable and practical, the control chip and the peripheral elements of the LED are reasonably matched, the circuit is simple and effective, the power supply can be automatically protected when the load current exceeds a limited condition, and meanwhile, proper packaging can be selected according to the power consumption required by a user.
Drawings
Fig. 1 is a diagram of an overload protection circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
Referring to fig. 1, in the overload protection circuit of the LED power control circuit with overload protection, a control terminal CTRL-LOAD is electrically connected to R1 and R2, respectively, R1 is connected in series with a light-emitting LED1 and then grounded to GND, R2 is electrically connected to Q1 and Q2, respectively, where two lines are LED out from R2, one line is connected to a collector of Q1, the other line is connected to a base of Q2, R1 is connected in series with a light-emitting LED1 and then connected in parallel to R6, one end of R6 is connected between bases of R2 and Q2, and the other end of R6 is grounded to GND.
In this embodiment, first, the CRTL-LOAD on the left side is the control end of the single chip microcomputer for outputting the start LOAD. CRTL-LOAD outputs high level, Q2 is opened, and LOAD LOAD-IN is accessed. The circuit will not be different under normal load condition, but when the load suddenly becomes large (short circuit or under wrong load condition), the protection circuit starts to work.
The base of Q1 is connected in series with R5 and then connected with a 5V power supply, R5 and R4 are connected in series, the base of Q1 is electrically connected with the connection end between R5 and R4, the main components in the overload protection circuit, i.e., Q1, R3, R4 and R5, Q1 is a conventional silicon tube, the conduction voltage drop is approximately 0.7V, in fig. 1, under the condition of no connection with any load, the base potential of Q1 can calculate VQ1b = (R3+ R4)/(R3+ R4+ R5) × 5, when the load is connected, a voltage drop is generated on R3, so that the base potential of Q1 is pushed to increase, and we default to 0.7V under an ideal condition, the triode Q1 is operated, so as to theoretically calculate how large the circuit connected with the load can be disconnected, i.e., Ib = (0.7-Q1 b)/R3.
One end of an emitter of the Q1 is grounded GND, the other end of the emitter of the Q1 is electrically connected with R3, the R3 is connected with R4 in series, a connecting end between the R3 and the R4 is electrically connected with the emitter of the Q2, the maximum load current of the circuit is judged by calculating how large the load circuit is connected to be turned off, when the load is increased, the potential of a base of the Q1 is increased to exceed 0.7V of the theoretical starting voltage of a triode, the Q1 is turned on, the base of the Q2 is pulled down, the Q2 is turned off, and finally the large load behind the circuit is cut off to play a role in overcurrent protection.
When selecting R3, we need to pay attention to the precision and packaging, and select a proper package according to the required power consumption, so as to avoid overheating of the device caused by large power consumption corresponding to a small package. For Q2, some margin may be left according to load requirements.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (3)
1. An LED power control circuit with overload protection, comprising: the overload protection circuit is characterized in that a control terminal CTRL-LOAD is respectively and electrically connected with R1 and R2, the R1 is connected with a luminous LED1 in series and then is grounded to GND, the R2 is respectively and electrically connected with Q1 and Q2, two lines are LED out from R2, one line is connected with a collector of Q1, the other line is connected with a base of Q2, the R1 is connected with a luminous LED1 in series and then is connected with R6 in parallel, one end of the R6 is connected between the bases of R2 and Q2, and the other end of the R6 is grounded to GND.
2. The LED power control circuit with overload protection as claimed in claim 1, wherein: one end of the emitter of the Q1 is grounded GND, the other end of the emitter is electrically connected with R3, the R3 is connected with R4 in series, and the connecting end between the R3 and the R4 is electrically connected with the emitter of the Q2.
3. The LED power control circuit with overload protection as claimed in claim 1, wherein: the base of the Q1 is connected with a 5-volt power supply in series after being connected with the R5, the R5 and the R4 of the Q1 are connected in series, and the base of the Q1 is electrically connected with the connecting end between the R5 and the R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122569941.5U CN216626104U (en) | 2021-10-25 | 2021-10-25 | LED power control circuit with overload protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122569941.5U CN216626104U (en) | 2021-10-25 | 2021-10-25 | LED power control circuit with overload protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216626104U true CN216626104U (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122569941.5U Active CN216626104U (en) | 2021-10-25 | 2021-10-25 | LED power control circuit with overload protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216626104U (en) |
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2021
- 2021-10-25 CN CN202122569941.5U patent/CN216626104U/en active Active
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