CN215187493U - Low no-load voltage control circuit of LED constant current power supply - Google Patents
Low no-load voltage control circuit of LED constant current power supply Download PDFInfo
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- CN215187493U CN215187493U CN202120675899.2U CN202120675899U CN215187493U CN 215187493 U CN215187493 U CN 215187493U CN 202120675899 U CN202120675899 U CN 202120675899U CN 215187493 U CN215187493 U CN 215187493U
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Abstract
The utility model discloses a low no-load voltage control circuit of LED constant current power supply, external power source VCC is connected with 1 foot of optoelectronic coupler U1, optoelectronic coupler U1 is connected with resistance R2, resistance R2 and electric capacity C2, diode U2 is connected, electric capacity C2 is connected with resistance R3, resistance R3 and resistance R4, resistance R6, resistance R5 is connected, resistance R4 is connected with the LED positive pole, diode U4 is connected with resistance 5, resistance R4 is connected with U4 comparator, U4 comparator is connected with resistance R4 and resistance R4 junction, resistance R4 and resistance R4, diode U4 and U4 comparator are connected, U4 comparator is connected with resistance R4 and switch K4, resistance R4 is connected with transformer T4 and electric capacity C4, the utility model discloses LED constant current power supply control circuit belongs to the technical field, specifically indicate a low no-load voltage control circuit.
Description
Technical Field
The utility model belongs to the technical field of LED constant current power supply control circuit, specifically indicate a low no-load voltage control circuit of LED constant current power supply.
Background
The common existing control circuit is not provided with a no-load voltage control circuit, the no-load voltage generally needs to be larger than the actual working voltage of the LED lamp, when the switch is closed, the capacitor discharges to the LED lamp bead, the instantaneous discharge current is not controlled by the constant current control circuit, the discharge current is far larger than the set current value, and the limit condition can damage the LED lamp bead.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a low no-load voltage control circuit of LED constant current power supply.
In order to realize the above functions, the utility model discloses the technical scheme who takes as follows: the LED constant current power supply low no-load voltage control circuit comprises the following connection relations: an external power source VCC is connected with a pin 1 of a photocoupler U1, a photocoupler U1 is connected with a resistor R2, a resistor R2 is connected with a capacitor C2 and a diode U2, a capacitor C2 is connected with a resistor R3, a resistor R3 is connected with a resistor R4, a resistor R6 and a resistor R5, a resistor R4 is connected with the LED anode, a diode U2 is connected with the resistor 5, a resistor R6 is connected with a U3 comparator, a U3 comparator is connected with the junction of the resistor R7 and the resistor R7, a resistor R7 is connected with the resistor R7, a diode U7 and the U7 comparator, a U7 comparator is connected with the resistor R7 and the switch K7, a resistor R7 is connected with the transformer T7 and the capacitor C7, a rectifier diode D7 is connected with the transformer T7, the capacitors C7 and the LED 7, the LED 7 is connected with the LED 7, the LED 7 is turned off, the LED is turned on lamp, and the LED is turned off, and the LED 7 is turned on lamp is turned off. U1, U2, R2, R3, R4, R5, and C2 are output voltage control circuits. U3, R5, R6, R7 are no-load voltage control circuits.
Further, the resistor R1 is an output current detection resistor.
Further, the capacitor C1 is an output filter capacitor.
The utility model adopts the above structure to gain beneficial effect as follows: the utility model provides a pair of LED constant current power supply low no-load voltage control circuit easy operation, the mechanism is compact, reasonable in design, after K1 breaks off, the electric current is zero in the R1, according to ohm's law, the voltage is zero on the R1, constant current control circuit became invalid, the power is in the constant voltage control mode, U2 and peripheral circuit work, simultaneously, U3's 1 st foot output high level, power output voltage LED + reduces. After K1 closed, overcurrent flows in the LED lamp, voltage rises on the R1, and after being higher than the 3 rd pin voltage, the 1 st pin output voltage is reduced, power output voltage LED + voltage rises, and the LED lamp bead is normally lighted.
Drawings
Fig. 1 is a circuit diagram of the low no-load voltage control circuit of the LED constant current power supply of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to a low no-load voltage control circuit of LED constant current power supply, the low no-load voltage control circuit connection relation of LED constant current power supply is: an external power source VCC is connected with a pin 1 of a photocoupler U1, a photocoupler U1 is connected with a resistor R2, a resistor R2 is connected with a capacitor C2 and a diode U2, a capacitor C2 is connected with a resistor R3, a resistor R3 is connected with a resistor R4, a resistor R6 and a resistor R5, a resistor R4 is connected with the LED anode, a diode U2 is connected with the resistor 5, a resistor R6 is connected with a U3 comparator, a U3 comparator is connected with the junction of the resistor R7 and the resistor R8, a resistor R8 is connected with a resistor R5, a diode U2 and a U2 comparator, a U2 comparator is connected with a resistor R2 and a switch K2, a resistor R2 is connected with a transformer T2 and a capacitor C2, a rectifier diode D2 is connected with a transformer T2, a capacitor C2 and an LED2, and a switch K2 are connected with the LED 2.
The resistor R1 is an output current detection resistor.
The capacitor C1 is an output filter capacitor.
When the constant-current control circuit is used specifically, after the K1 is switched off, the current in the R1 is zero, the voltage on the R1 is zero according to ohm's law, the constant-current control circuit fails, the power supply is in a constant-voltage control mode, the U2 and peripheral circuits of the U2 work, meanwhile, the 1 st pin of the U3 outputs high level, and the output voltage LED + of the power supply is reduced. After K1 is closed, current flows in the LED lamp, the voltage on R1 rises, after the voltage is higher than the voltage of pin 3, the output voltage of pin 1 is reduced, the power output voltage LED + voltage rises, and the LED lamp bead is normally lighted.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (3)
1. The utility model provides a LED constant current power supply low no-load voltage control circuit which characterized in that: the LED constant current power supply low no-load voltage control circuit has the following connection relationship: an external power source VCC is connected with a pin 1 of a photocoupler U1, a photocoupler U1 is connected with a resistor R2, a resistor R2 is connected with a capacitor C2 and a diode U2, a capacitor C2 is connected with a resistor R3, a resistor R3 is connected with a resistor R4, a resistor R6 and a resistor R5, a resistor R4 is connected with the LED anode, a diode U2 is connected with the resistor 5, a resistor R6 is connected with a U3 comparator, a U3 comparator is connected with the junction of the resistor R7 and the resistor R8, a resistor R8 is connected with a resistor R5, a diode U2 and a U2 comparator, a U2 comparator is connected with a resistor R2 and a switch K2, a resistor R2 is connected with a transformer T2 and a capacitor C2, a rectifier diode D2 is connected with a transformer T2, a capacitor C2 and an LED2, and a switch K2 are connected with the LED 2.
2. The LED constant-current power supply low no-load voltage control circuit according to claim 1, characterized in that: the resistor R1 is an output current detection resistor.
3. The LED constant-current power supply low no-load voltage control circuit according to claim 2, characterized in that: the capacitor C1 is an output filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120675899.2U CN215187493U (en) | 2021-04-02 | 2021-04-02 | Low no-load voltage control circuit of LED constant current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120675899.2U CN215187493U (en) | 2021-04-02 | 2021-04-02 | Low no-load voltage control circuit of LED constant current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215187493U true CN215187493U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120675899.2U Active CN215187493U (en) | 2021-04-02 | 2021-04-02 | Low no-load voltage control circuit of LED constant current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215187493U (en) |
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2021
- 2021-04-02 CN CN202120675899.2U patent/CN215187493U/en active Active
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