Constant current control LED power supply

Abstract

The utility model, which relates to the LED field, discloses a constant-current-controlled LED power supply comprising a power supply module used for introducing a 220V alternating current and supplying the 220V alternating current to a step-down rectification filtering module; the step-down rectification filtering module is used for converting alternating current into direct current and supplying the direct current to the voltage protection module; the voltage protection module is used for detecting the input voltage and stopping supplying power to the constant-current working module when the input voltage exceeds a set threshold value; when the input voltage is lower than a set threshold value, power is supplied to the constant-current working module; the abnormity indication module is used for detecting whether the voltage protection module supplies power to the constant-current working module and giving out light to indicate the power supply state of the voltage protection module; the beneficial effects of the utility model are that the utility model is provided with the abnormity indication module, when the input voltage is abnormal, the voltage protection module starts power-off protection, and stops supplying power to the constant current work module, the abnormity indication module emits light, reminds a user of abnormal power supply, and deals with the abnormal power supply in time.

Description

Technical Field

[0001] The utility model relates to the field of LEDs, and specifically to an LED power supply with constant current control. Background Art

[0002] An LED constant current circuit is a common circuit design for driving LED lights. The LED constant current circuit can ensure the stable brightness of the LED lights, not affected by voltage fluctuations, enabling the LED lights to maintain a consistent brightness during long-term use and extending the service life of the LED lights.

[0003] The LED constant current circuit often also sets a voltage protection circuit to prevent the LED lights from being damaged due to excessive input voltage. The disadvantage is that there is a lack of an indication device, resulting in users being unclear about the voltage status and needing improvement. Content of the Utility Model

[0004] The purpose of the utility model is to provide an LED power supply with constant current control to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An LED power supply with constant current control, comprising:

[0007] A power supply module for introducing 220V alternating current and supplying it to the step-down rectification and filtering module;

[0008] A step-down rectification and filtering module for converting alternating current into direct current and supplying it to the voltage protection module;

[0009] A voltage protection module for detecting the input voltage, stopping supplying power to the constant current working module when the input voltage exceeds the set threshold; and supplying power to the constant current working module when the input voltage is lower than the set threshold;

[0010] An abnormal indication module for detecting whether the voltage protection module supplies power to the constant current working module and indicating the power supply status of the voltage protection module by emitting light;

[0011] A constant current working module for supplying a constant current to the LED lights;

[0012] The power supply module is connected to the step-down rectification and filtering module, the step-down rectification and filtering module is connected to the voltage protection module, and the voltage protection module is connected to the constant current working module and the abnormal indication module.

[0013] As a further solution of the utility model: The step-down rectification and filtering module includes a transformer W, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, and a resistor R1. The input end of the transformer W is connected to the power supply module. One end of the output end of the transformer W is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3. The other end of the output end of the transformer W is connected to the positive electrode of the diode D2 and the negative electrode of the diode D4. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2, one end of the capacitor C1, and one end of the inductor L1. The positive electrode of the diode D3 is grounded. The positive electrode of the diode D4 is grounded. The other end of the capacitor C1 is grounded. The other end of the inductor L1 is connected to one end of the resistor R1 and the voltage protection module. The other end of the resistor R1 is grounded.

[0014] As a further solution of the utility model: The voltage protection module includes a resistor R2, a capacitor C2, a resistor R3, a diode D5, a resistor R4, a triode V1, a resistor R5, a resistor R6, a MOS tube V2, and a capacitor C3. One end of the resistor R2 is connected to the step-down rectification and filtering module. The other end of the resistor R2 is connected to one end of the capacitor C2, one end of the resistor R3, the emitter of the triode V1, one end of the resistor R5, and the D pole of the MOS tube V2. The other end of the capacitor C2 is grounded. The other end of the resistor R3 is connected to the negative electrode of the diode D5 and one end of the resistor R4. The positive electrode of the diode D5 is grounded. The other end of the resistor R4 is connected to the base of the triode V1. The collector of the triode V1 is connected to the other end of the resistor R5, one end of the resistor R6, the G pole of the MOS tube V2, and the abnormal indication module. The other end of the resistor R6 is grounded. The S pole of the MOS tube V2 is connected to one end of the capacitor C3 and the constant current working module. The other end of the capacitor C3 is grounded.

[0015] As a further solution of the utility model: The abnormal indication module includes a diode D6 and a diode D7. The negative electrode of the diode D6 is connected to the voltage protection module. The positive electrode of the diode D6 is connected to the positive electrode of the diode D7. The negative electrode of the diode D7 is grounded.

[0016] As a further solution of the utility model: The constant current working module includes a chip U1, an LED lamp D8, a resistor R7, and a potentiometer RP1. The model of the chip U1 is SM2612EN. The positive electrode of the diode D8 is connected to the voltage protection module. The negative electrode of the diode D8 is connected to the 7th pin of the chip U1. The 1st pin of the chip U1 is grounded. The 2nd pin of the chip U1 is connected to one end of the resistor R7. The other end of the resistor R7 is connected to one end of the potentiometer RP1. The other end of the potentiometer RP1 is grounded.

[0017] Compared with the prior art, the beneficial effect of the utility model is that the utility model is provided with an abnormal indication module. When the input voltage is abnormal and the voltage protection module starts the power-off protection and stops supplying power to the constant current working module, it will emit light to remind the user that the power supply is abnormal and deal with it in time. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of a constant - current controlled LED power supply.

[0019] Figure 2 It is a circuit diagram of a step - down rectifying and filtering module.

[0020] Figure 3 It is a circuit diagram of a voltage protection module, an abnormal indication module and a constant - current working module. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Please refer to Figure 1 , a constant - current controlled LED power supply, comprising:

[0023] A power supply module for introducing 220V alternating current and supplying it to the step - down rectifying and filtering module;

[0024] A step - down rectifying and filtering module for converting alternating current into direct current and supplying it to the voltage protection module;

[0025] A voltage protection module for detecting the input voltage, stopping supplying power to the constant - current working module when the input voltage exceeds the set threshold; and supplying power to the constant - current working module when the input voltage is lower than the set threshold;

[0026] An abnormal indication module for detecting whether the voltage protection module supplies power to the constant - current working module and indicating the power supply state of the voltage protection module by lighting;

[0027] A constant - current working module for supplying a constant current to the LED lamp;

[0028] The power supply module is connected to the step - down rectifying and filtering module, the step - down rectifying and filtering module is connected to the voltage protection module, and the voltage protection module is connected to the constant - current working module and the abnormal indication module.

[0029] In this embodiment: Please refer to Figure 3, the step-down rectification and filtering module includes a transformer W, diodes D1, D2, D3, D4, a capacitor C1, an inductor L1, and a resistor R1. The input end of the transformer W is connected to the power supply module. One end of the output end of the transformer W is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3. The other end of the output end of the transformer W is connected to the positive electrode of the diode D2 and the negative electrode of the diode D4. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2, one end of the capacitor C1, and one end of the inductor L1. The positive electrode of the diode D3 is grounded. The positive electrode of the diode D4 is grounded. The other end of the capacitor C1 is grounded. The other end of the inductor L1 is connected to one end of the resistor R1 and the voltage protection module. The other end of the resistor R1 is grounded.

[0030] The alternating current is input, stepped down by the transformer W, passed through the rectification circuit composed of the diodes D1, D2, D3, and D4 to complete the AC-DC conversion, and passed through the filtering circuit composed of the capacitor C1, the inductor L1, and the resistor R1 to make the voltage stable and supply the subsequent circuit.

[0031] In this embodiment: Please refer to Figure 3 , the voltage protection module includes a resistor R2, a capacitor C2, a resistor R3, a diode D5, a resistor R4, a triode V1, a resistor R5, a resistor R6, a MOS transistor V2, and a capacitor C3. One end of the resistor R2 is connected to the step-down rectification and filtering module. The other end of the resistor R2 is connected to one end of the capacitor C2, one end of the resistor R3, the emitter of the triode V1, one end of the resistor R5, and the D pole of the MOS transistor V2. The other end of the capacitor C2 is grounded. The other end of the resistor R3 is connected to the negative electrode of the diode D5 and one end of the resistor R4. The positive electrode of the diode D5 is grounded. The other end of the resistor R4 is connected to the base of the triode V1. The collector of the triode V1 is connected to the other end of the resistor R5, one end of the resistor R6, the G pole of the MOS transistor V2, and the abnormal indication module. The other end of the resistor R6 is grounded. The S pole of the MOS transistor V2 is connected to one end of the capacitor C3 and the constant current operation module. The other end of the capacitor C3 is grounded.

[0032] When the input voltage is normal, the zener diode D5 is not conducting, making the base of the triode V1 at a high level, and the triode V1 is cut off, resulting in a potential difference between the D pole and the G pole of the MOS transistor V2, and the MOS transistor V2 conducts to supply power. When the input voltage exceeds the set threshold, the zener diode D5 conducts, making the base of the triode V1 become a low level, and the triode V1 conducts, causing the D pole and the G pole of the MOS transistor V2 to conduct through the triode V1, and the potential difference between the D pole and the G pole of the MOS transistor V2 is relatively small, and the MOS transistor V2 is cut off to stop supplying power to the subsequent circuit.

[0033] In this embodiment: Please refer to Figure 3, the abnormal indication module includes diode D6 and diode D7. The negative electrode of diode D6 is connected to the voltage protection module, the positive electrode of diode D6 is connected to the positive electrode of diode D7, and the negative electrode of diode D7 is grounded.

[0034] When the input voltage exceeds the set threshold, triode V1 conducts, causing the voltage at the collector of triode V1 to increase enough to turn on zener diode D6, making diode D7 emit light to indicate that the current input voltage is too high.

[0035] In this embodiment: Please refer to Figure 3 , the constant current working module includes chip U1, LED D8, resistor R7, and potentiometer RP1. The model of chip U1 is SM2612EN. The positive electrode of diode D8 is connected to the voltage protection module, the negative electrode of diode D8 is connected to pin 7 of chip U1, pin 1 of chip U1 is grounded, pin 2 of chip U1 is connected to one end of resistor R7, the other end of resistor R7 is connected to one end of potentiometer RP1, and the other end of potentiometer RP1 is grounded.

[0036] By adjusting the resistance value of potentiometer RP1, the resistance value at pin 2 of chip U1 is changed, thereby changing the current value at pin 7 of chip U1 and the current value flowing through LED D8.

[0037] The working principle of the present utility model is as follows: The power supply module is used to introduce 220V alternating current and supply it to the step-down rectification and filtering module; the step-down rectification and filtering module is used to convert alternating current into direct current and supply it to the voltage protection module; the voltage protection module is used to detect the input voltage. When the input voltage exceeds the set threshold, it stops supplying power to the constant current working module; when the input voltage is lower than the set threshold, it supplies power to the constant current working module; the abnormal indication module is used to detect whether the voltage protection module supplies power to the constant current working module and emits light to indicate the power supply state of the voltage protection module; the constant current working module is used to supply a constant current to the LED lamp.

[0038] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A constant current controlled LED power supply, characterized in that: The constant current controlled LED power supply includes: The power supply module is used to introduce 220V AC power to supply the step-down rectifier and filter module; The step-down rectifier and filter module is used to convert AC power into DC power and supply it to the voltage protection module; The voltage protection module is used to detect the input voltage. When the input voltage exceeds the set threshold, the constant current working module is stopped from being powered; when the input voltage is lower than the set threshold, the constant current working module is powered; An abnormal indication module is used to detect whether the voltage protection module supplies power to the constant current working module, and to illuminate to indicate the power supply status of the voltage protection module; Constant current working module, used to supply constant current to LED lamp; The power supply module is connected to the step-down rectifier and filter module, the step-down rectifier and filter module is connected to the voltage protection module, and the voltage protection module is connected to the constant current working module and the abnormal indication module.

2. The constant current controlled LED power supply according to claim 1, characterized in that: The step-down rectifier and filter module includes a transformer W, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, and a resistor R1. The input end of the transformer W is connected to the power supply module, one end of the output end of the transformer W is connected to the positive electrode of the diode D1 and the negative electrode of the diode D3, the other end of the output end of the transformer W is connected to the positive electrode of the diode D2 and the negative electrode of the diode D4, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2, one end of the capacitor C1, and one end of the inductor L1, the positive electrode of the diode D3 is grounded, the positive electrode of the diode D4 is grounded, the other end of the capacitor C1 is grounded, the other end of the inductor L1 is connected to one end of the resistor R1 and the voltage protection module, and the other end of the resistor R1 is grounded.

3. The constant current controlled LED power supply according to claim 1, characterized in that: The voltage protection module includes a resistor R2, a capacitor C2, a resistor R3, a diode D5, a resistor R4, a transistor V1, a resistor R5, a resistor R6, a MOS tube V2, and a capacitor C3. One end of the resistor R2 is connected to the step-down rectifier and filter module, the other end of the resistor R2 is connected to one end of the capacitor C2, one end of the resistor R3, the emitter of the transistor V1, one end of the resistor R5, and the D pole of the MOS tube V2. The other end of the capacitor C2 is grounded, the other end of the resistor R3 is connected to the negative pole of the diode D5 and one end of the resistor R4, the positive pole of the diode D5 is grounded, the other end of the resistor R4 is connected to the base of the transistor V1, the collector of the transistor V1 is connected to the other end of the resistor R5, one end of the resistor R6, the G pole of the MOS tube V2, and the abnormal indication module, the other end of the resistor R6 is grounded, the S pole of the MOS tube V2 is connected to one end of the capacitor C3 and the constant current working module, and the other end of the capacitor C3 is grounded.

4. The constant current controlled LED power supply according to claim 1, characterized in that: The abnormal indication module includes a diode D6 and a diode D7. The cathode of the diode D6 is connected to the voltage protection module, the anode of the diode D6 is connected to the anode of the diode D7, and the cathode of the diode D7 is grounded.

5. The constant current controlled LED power supply according to any one of claims 1, 3 and 4, characterized in that: The constant current working module includes chip U1, LED lamp D8, resistor R7, and potentiometer RP1. The model of chip U1 is SM2612EN. The positive pole of diode D8 is connected to the voltage protection module, the negative pole of diode D8 is connected to pin 7 of chip U1, pin 1 of chip U1 is grounded, pin 2 of chip U1 is connected to one end of resistor R7, the other end of resistor R7 is connected to one end of potentiometer RP1, and the other end of potentiometer RP1 is grounded.

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