CN219164779U - LED power supply circuit - Google Patents
LED power supply circuit Download PDFInfo
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- CN219164779U CN219164779U CN202223057401.XU CN202223057401U CN219164779U CN 219164779 U CN219164779 U CN 219164779U CN 202223057401 U CN202223057401 U CN 202223057401U CN 219164779 U CN219164779 U CN 219164779U
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Abstract
The utility model relates to the field of LED power supply circuits, and discloses an LED power supply circuit which comprises a rectifying unit, a current limiting unit, a lighting unit and a warning unit; the first pin and the third pin of the rectifying unit are respectively and electrically connected with the first power input end and the second power input end, the second pin of the rectifying unit is electrically connected with the input end of the current limiting unit, the output end of the current limiting unit is electrically connected with the input end of the lighting unit, the output end of the lighting unit is electrically connected with the input end of the warning unit, and the output end of the warning unit is electrically connected with the fourth pin of the rectifying unit. According to the LED lamp lighting device, the current limiting unit is arranged, so that the LED lamp cannot emit light under the low-voltage and weak-voltage environments, abnormal lighting states such as flickering and the like of the LED lamp under the low voltage are avoided, the LED lamp is prevented from burning out, the service life of the LED lamp is prolonged, and the warning unit is arranged, so that a user is reminded of detecting the service condition of the LED lamp when the external voltage is too high.
Description
[ field of technology ]
The utility model relates to the field of LED power supply circuits, in particular to an LED power supply circuit.
[ background Art ]
The LED lamp is used for life and production in the aspect, the LED lamp can send weak light in low voltage and induced potential environment, the condition that the light frequently appears twinkling, lead to LED lamp scintillation to give out light, burn out the LED lamp easily, lead to its life to reduce greatly, especially in some electric cabinets, because electrical components are more, in time after the switch disconnection in the circuit, still probably have certain induced potential existence, under induced potential's influence, the LED lamp can carry out scintillation and give out light, long-time under this kind of environment, the LED lamp is very easy to burn out, need often change the LED lamp. On the other hand, when the voltage provided by the outside is too high (the voltage is unstable), the LED lamp cannot work in the normal voltage environment for a long time, and the LED lamp is very easy to burn out, but a user often does not know whether the LED lamp is in the high-voltage working environment or not, so that the LED lamp needs to be replaced after being used for a period of time.
[ utility model ]
The utility model aims to solve the problems and provide an LED power supply circuit which solves the problems that when the voltage of the traditional LED power supply circuit is too low or when electric elements are more, induced potential exists to cause the LED lamp to flash and emit light, so that the LED lamp is easy to burn out and the service life of the LED lamp is shortened when the LED power supply circuit works under high voltage.
To achieve the purpose, the utility model adopts the following technical scheme:
an LED power supply circuit comprises a rectifying unit, a current limiting unit, a lighting unit and a warning unit;
the first pin and the third pin of the rectifying unit are respectively and electrically connected with a first power input end and a second power input end, the second pin of the rectifying unit is electrically connected with the input end of the current limiting unit, the output end of the current limiting unit is electrically connected with the input end of the lighting unit, the output end of the lighting unit is electrically connected with the input end of the warning unit, and the output end of the warning unit is electrically connected with the fourth pin of the rectifying unit.
The rectifying unit comprises a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3 and a fourth rectifying diode D4;
the anode end of the first rectifying diode D1 and the cathode end of the fourth rectifying diode D4 are electrically connected with the third pin, the cathode end of the first rectifying diode D1 and the cathode end of the second rectifying diode D2 are electrically connected with the second pin, the anode end of the second rectifying diode D2 and the cathode end of the third rectifying diode D3 are electrically connected with the first pin, and the anode end of the third rectifying diode D3 and the anode end of the fourth rectifying diode D4 are electrically connected with the fourth pin.
The rectifying unit further comprises a resistor R1;
one end of the resistor R1 is electrically connected with the first power input end, and the other end of the resistor R1 is electrically connected with the first pin.
The current limiting unit comprises a first zener diode ZD1;
the cathode end of the first zener diode ZD1 is electrically connected with the second pin, and the anode end of the first zener diode ZD1 is electrically connected with the input end of the lighting unit.
The lighting unit comprises a resistor R2, a second zener diode ZD2 and an LED lamp;
one end of the resistor R2 and the cathode end of the second zener diode ZD2 are electrically connected with the anode end of the first zener diode ZD1;
the other end of the resistor R2 is electrically connected with the positive electrode end of the LED lamp;
the anode end of the second zener diode ZD2 and the cathode end of the LED lamp are electrically connected with the input end of the warning unit.
The warning unit comprises a resistor R3, a warning lamp and a third zener diode ZD3;
one end of the resistor R3 and the positive electrode end of the warning lamp are electrically connected with the negative electrode end of the LED lamp and the cathode end of the second zener diode ZD 2;
the negative electrode end of the warning lamp is electrically connected with the anode end of the third zener diode ZD3;
the other end of the resistor R3 is electrically connected with the cathode end of the third zener diode ZD3 and the fourth pin.
The contribution of the utility model is as follows: according to the LED lamp, the current limiting unit is arranged, so that the LED lamp cannot emit light under low voltage, abnormal light emitting states such as flickering and the like of the LED lamp under low voltage are avoided, the LED lamp is prevented from burning out, the service life of the LED lamp is prolonged, and the warning unit is arranged, so that a user is reminded of detecting the service condition of the LED lamp when the external voltage is too high.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a power supply circuit for an LED lamp according to the present utility model;
wherein: the device comprises a rectifying unit 10, a current limiting unit 20, a lighting unit 30, a warning unit 40, an LED lamp 50 and a warning lamp 60.
[ detailed description ] of the utility model
The following examples are further illustrative and supplementary of the present utility model and are not intended to limit the utility model in any way.
As shown in fig. 1, an LED power supply circuit includes a rectifying unit 10, a current limiting unit 20, a lighting unit 30, and a warning unit 40;
the first pin and the third pin of the rectifying unit 10 are respectively electrically connected with a first power input end and a second power input end, the second pin of the rectifying unit 10 is electrically connected with the input end of the current limiting unit 20, the output end of the current limiting unit 20 is electrically connected with the input end of the lighting unit 30, the output end of the lighting unit 30 is electrically connected with the input end of the warning unit 40, and the output end of the warning unit 40 is electrically connected with the fourth pin of the rectifying unit 10.
The rectifying unit 10 is configured to rectify a power voltage supplied from the first power input terminal and the second power input terminal, and apply the rectified voltage to the current limiting unit 20, the lighting unit 30, and the warning unit 40.
The current limiting unit 20 plays a role in protecting the LED lamp 50 in the lighting unit 30, specifically, when the voltage input through the first power input end or the second power input end is low and is insufficient to fully drive the LED lamp 50 to normally work, the first zener diode ZD1 in the current limiting unit 20 is turned off reversely, the output of the power supply voltage is cut off, the LED lamp 50 cannot emit light under low voltage, abnormal light emitting states such as flickering and the like of the LED lamp 50 are avoided, the LED lamp 50 is easy to burn out, further description is further provided, especially in an environment with more electrical elements, a certain induction potential still possibly exists after a switch in a circuit is disconnected, the LED lamp 50 can emit weak flickering light in the induction potential environment, if the LED lamp 50 emits weak light due to the induction potential in the environment for a long time, the service life of the LED lamp 50 is greatly reduced, the LED lamp 50 cannot emit light under the induction potential environment due to cut-off limitation of the low voltage, and the influence of the LED lamp 50 due to the induction potential is avoided.
The warning unit 40 is used for sending out an alarm, especially when the voltage input from the outside is too high, the warning unit 40 will send out an alarm, and the warning light 60 will be turned on to remind the user to detect the condition of the external power supply.
According to the utility model, the current limiting unit 20 is arranged, so that the LED lamp 50 can not emit light under the low-voltage and weak-voltage environments, abnormal light emitting states such as flickering and the like of the LED lamp 50 under the low voltage are avoided, the LED lamp 50 is prevented from being burnt out, the service life of the LED lamp 50 is prolonged, and the warning unit 40 is arranged, so that a user is reminded of detecting the service condition of the LED lamp 50 when the external voltage is too high.
The rectifying unit 10 includes a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3, and a fourth rectifying diode D4;
the anode end of the first rectifying diode D1 and the cathode end of the fourth rectifying diode D4 are electrically connected with the third pin, the cathode end of the first rectifying diode D1 and the cathode end of the second rectifying diode D2 are electrically connected with the second pin, the anode end of the second rectifying diode D2 and the cathode end of the third rectifying diode D3 are electrically connected with the first pin, and the anode end of the third rectifying diode D3 and the anode end of the fourth rectifying diode D4 are electrically connected with the fourth pin.
The first power input end and the second power input end can be direct current power or alternating current power, when the direct current power is input, the connected external power can be connected to the power supply circuit without polarity division, specifically, when the first power input end is connected with the positive pole of the external power, the second power input end is connected with the negative pole of the external power, the second rectifying diode D2 and the fourth rectifying diode D4 are conducted at the moment, the first rectifying diode D1 and the third rectifying diode D3 are cut off, when the first power input end is connected with the negative pole of the external power, the second power input end is connected with the positive pole of the external power, the first rectifying diode D1 and the third rectifying diode D3 are conducted at the moment, and the second rectifying diode D2 and the fourth rectifying diode D4 are cut off.
The rectifying unit 10 further includes a resistor R1;
one end of the resistor R1 is electrically connected with the first power input end, and the other end of the resistor R1 is electrically connected with the first pin.
The current limiting unit 20 includes a first zener diode ZD1;
the cathode terminal of the first zener diode ZD1 is electrically connected to the second pin, and the anode terminal of the first zener diode ZD1 is electrically connected to the input terminal of the lighting unit 30.
The first zener diode ZD1 plays a role in current limiting, specifically, when the voltage provided by the outside is greater than the cut-off voltage of the first zener diode ZD1, the LED lamp 50 can normally illuminate, when the voltage provided by the outside is less than the cut-off voltage of the first zener diode ZD1 in the direction, the first zener diode ZD1 is cut off in the direction, the output of the power supply voltage is cut off, the voltage at the LED lamp 50 is 0, and the LED lamp 50 cannot emit light, so that the effect of protecting the LED lamp 50 is achieved.
The lighting unit 30 includes a resistor R2, a second zener diode ZD2, and an LED lamp 50;
one end of the resistor R2 and the cathode end of the second zener diode ZD2 are electrically connected with the anode end of the first zener diode ZD1;
the other end of the resistor R2 is electrically connected with the positive electrode end of the LED lamp 50;
the anode terminal of the second zener diode ZD2 and the cathode terminal of the LED lamp 50 are electrically connected to the input terminal of the alarm unit 40.
The warning unit 40 comprises a resistor R3, a warning lamp 60 and a third zener diode ZD3;
one end of the resistor R3 and the positive end of the warning lamp 60 are electrically connected with the negative end of the LED lamp 50 and the negative end of the second zener diode ZD 2;
the negative terminal of the warning lamp 60 is electrically connected with the anode terminal of the third zener diode ZD3;
the other end of the resistor R3 is electrically connected with the cathode end of the third zener diode ZD3 and the fourth pin.
The cut-off voltage of the third zener diode ZD3 is set to be higher than the normal working voltage of the LED lamp 50 and is also higher than the cut-off voltage of the first zener diode ZD1, when the LED lamp 50 works normally, the warning lamp 60 cannot be turned on because the working voltage is lower than the cut-off voltage of the third zener diode ZD3, the warning lamp 60 cannot be turned on, which means that the LED lamp 50 works normally, when the power supply voltage is higher than the normal working voltage of the LED lamp 50 and is also higher than the cut-off voltage of the third zener diode ZD3, the third zener diode ZD3 is turned on, and the warning lamp 60 is turned on to remind a user to check whether the external circuit has a problem.
Although the present utility model has been disclosed by the above embodiments, the scope of the present utility model is not limited thereto, and modifications, substitutions, etc. made to the above components will fall within the scope of the claims of the present utility model without departing from the spirit of the present utility model.
Claims (6)
1. An LED power supply circuit, characterized in that: the device comprises a rectifying unit, a current limiting unit, a lighting unit and a warning unit;
the first pin and the third pin of the rectifying unit are respectively and electrically connected with a first power input end and a second power input end, the second pin of the rectifying unit is electrically connected with the input end of the current limiting unit, the output end of the current limiting unit is electrically connected with the input end of the lighting unit, the output end of the lighting unit is electrically connected with the input end of the warning unit, and the output end of the warning unit is electrically connected with the fourth pin of the rectifying unit.
2. An LED power supply as set forth in claim 1, wherein: the rectifying unit comprises a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3 and a fourth rectifying diode D4;
the anode end of the first rectifying diode D1 and the cathode end of the fourth rectifying diode D4 are electrically connected with the third pin, the cathode end of the first rectifying diode D1 and the cathode end of the second rectifying diode D2 are electrically connected with the second pin, the anode end of the second rectifying diode D2 and the cathode end of the third rectifying diode D3 are electrically connected with the first pin, and the anode end of the third rectifying diode D3 and the anode end of the fourth rectifying diode D4 are electrically connected with the fourth pin.
3. An LED power supply as set forth in claim 1, wherein: the rectifying unit further comprises a resistor R1;
one end of the resistor R1 is electrically connected with the first power input end, and the other end of the resistor R1 is electrically connected with the first pin.
4. An LED power supply as set forth in claim 1, wherein: the current limiting unit comprises a first zener diode ZD1;
the cathode end of the first zener diode ZD1 is electrically connected with the second pin, and the anode end of the first zener diode ZD1 is electrically connected with the input end of the lighting unit.
5. The LED power supply circuit of claim 4, wherein: the lighting unit comprises a resistor R2, a second zener diode ZD2 and an LED lamp;
one end of the resistor R2 and the cathode end of the second zener diode ZD2 are electrically connected with the anode end of the first zener diode ZD1;
the other end of the resistor R2 is electrically connected with the positive electrode end of the LED lamp;
the anode end of the second zener diode ZD2 and the cathode end of the LED lamp are electrically connected with the input end of the warning unit.
6. The LED power supply circuit of claim 5, wherein: the warning unit comprises a resistor R3, a warning lamp and a third zener diode ZD3;
one end of the resistor R3 and the positive electrode end of the warning lamp are electrically connected with the negative electrode end of the LED lamp and the cathode end of the second zener diode ZD 2;
the negative electrode end of the warning lamp is electrically connected with the anode end of the third zener diode ZD3;
the other end of the resistor R3 is electrically connected with the cathode end of the third zener diode ZD3 and the fourth pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223057401.XU CN219164779U (en) | 2022-11-17 | 2022-11-17 | LED power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223057401.XU CN219164779U (en) | 2022-11-17 | 2022-11-17 | LED power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219164779U true CN219164779U (en) | 2023-06-09 |
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ID=86621227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223057401.XU Active CN219164779U (en) | 2022-11-17 | 2022-11-17 | LED power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219164779U (en) |
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2022
- 2022-11-17 CN CN202223057401.XU patent/CN219164779U/en active Active
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