Simple low-cost circuit capable of changing output current of constant-current power supply

By introducing the field effect transistor M1 into the constant current chip circuit and adjusting the fourth pin of the constant current chip using resistors RS1 and RS2, the problem of high cost in regulating the output current is solved, low-cost and simple constant current output adjustment is achieved, and the application range is expanded.

CN222655365UActive Publication Date: 2025-03-21GUANGDONG PAK CORP CO LTD
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Patent Information

Application Number
CN202421188317.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-28
Publication Date
2025-03-21
Estimated Expiration
2034-05-28

AI Technical Summary

Technical Problem

When existing constant current power supplies need to adjust the output current, they need to replace the constant current chip with dimming function, resulting in a significant increase in cost. At the same time, the dimming foot is missing in the non-dimating constant current chip, which cannot change the size of the constant current output.

Method used

By introducing the field effect tube M1 into the constant current chip circuit, and connecting the fourth pin of the constant current chip to the D terminal of the field effect tube M1 through the resistor RS1, and connecting the resistor RS2 to ground, the constant current output current can be adjusted.

Benefits of technology

The ability to simply adjust the constant current output current at low cost is realized, reducing costs, and expanding the application range of the circuit, so that the constant current output can be adjusted accordingly according to different application occasions.

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Abstract

The utility model discloses a simple low-cost circuit capable of changing the output current of a constant-current power supply, which comprises a constant-current chip circuit, a constant-current output size control circuit and an LED load circuit, the constant-current chip circuit comprises a constant-current chip U1, the constant-current output size control circuit comprises a field-effect tube M1, a field-effect tube M2, a field-effect tube M3 and a field-effect tube M4, and the field-effect tube M1 is connected with the field-effect tube M1. A fourth pin of the constant current chip U1 is connected with a D end of the field effect transistor M1 through a resistor RS1, the fourth pin of the constant current chip U1 is grounded through a resistor RS2, the fourth pin of the constant current chip U1 is a current setting pin, and a G end of the field effect transistor M1 is connected with a signal input end VDD-EN through a resistor R3. According to the utility model, the structure is simple, adaptation can be carried out by adjusting the resistance values of the resistor RS1 and the resistor RS2, the cost is reduced, the application circuit range is wide, and the constant current output can be correspondingly adjusted according to the application occasion, so that the brightness control of the LED is realized under the condition of ensuring low cost.
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Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a simple and low-cost circuit capable of changing the output current of a constant current power supply. Background Art

[0002] At present, there are two types of constant current power supplies on the market: dimmable constant current chips and non-dimmable constant current chips. Dimmable constant current chips are generally much more expensive than non-dimmable constant current chips. After the peripheral circuit of non-dimmable constant current chips is configured, the output current of the circuit is fixed. If you want to adjust the output current, you need to replace it with a constant current chip with a dimming function, which greatly increases the cost. At the same time, there is a lack of dimming pins in non-dimmable constant current chips. After the circuit is adjusted, the size of the constant current output cannot be changed. If it is replaced with a dimmable constant current chip, the cost will be greatly increased. Therefore, in order to avoid the shortcomings of the prior art, it is necessary to improve the prior art. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a simple and low-cost circuit capable of changing the output current of a constant current power supply.

[0004] The utility model is realized by the following technical solutions:

[0005] A simple and low-cost circuit capable of changing the output current of a constant current power supply comprises a constant current chip circuit, a circuit for controlling the output size of a constant current, and an LED load circuit. The constant current chip circuit comprises a constant current chip U1, and the circuit for controlling the output size of a constant current comprises a field effect tube M1. The fourth pin of the constant current chip U1 is connected to the D end of the field effect tube M1 through a resistor RS1, and the fourth pin of the constant current chip U1 is grounded through a resistor RS2. The fourth pin of the constant current chip U1 is a current setting pin, and the G end of the field effect tube M1 is connected to a signal input end VDD-EN through a resistor R3.

[0006] Furthermore, the model of the constant current chip U1 is Hi2601B.

[0007] Furthermore, the constant current chip circuit also includes a polarity capacitor EC1, the first pin of the constant current chip U1 is connected to the power input positive pole IN through the resistor R1, the first pin of the constant current chip U1 is grounded through the capacitor C1, the positive pole of the polarity capacitor EC1 is connected to the power input positive pole IN, and the negative pole of the polarity capacitor EC1 is grounded.

[0008] Furthermore, the constant current chip circuit also includes a diode D1, the LED load circuit includes a lamp LED1, the fifth pin and the sixth pin of the constant current chip U1 are both connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the positive electrode IN of the power input, the fifth pin and the sixth pin of the constant current chip U1 are both connected to the DC output negative electrode through the inductor L1, the DC output positive electrode is connected to the positive electrode IN of the power input, the DC output positive electrode is connected to the positive electrode of the lamp LED1, and the DC output negative electrode is connected to the negative electrode of the lamp LED1.

[0009] Furthermore, the S end of the field effect tube M1 is grounded, and the S end of the field effect tube M1 is connected to the G end of the field effect tube M1 through a resistor R4.

[0010] Furthermore, the seventh pin and the eighth pin of the constant current chip U1 are both grounded.

[0011] Compared with the prior art, the utility model connects the D end of the field effect tube M1 through the fourth pin of the constant current chip U1 through the resistor RS1, the fourth pin of the constant current chip U1 is grounded through the resistor RS2, the fourth pin of the constant current chip U1 is the current setting pin, U1 starts to work when the power input positive pole IN is input, when there is no signal at the signal input end VDD-EN, the fourth pin (current setting pin) of the constant current chip U1 only has the resistor RS2 to adjust the constant current output current; when there is a signal at the signal input end VDD-EN, the field effect tube M1 is turned on, and at this time, the resistor RS1 connected to the fourth pin of the constant current chip U1 is also turned on to the ground and connected in parallel with the resistor RS2, and the detection resistance value of the fourth pin on the constant current chip U1 changes, thereby changing the size of the constant current output current, so that the circuit structure is simple, the constant current output current has strong applicability, and when different currents are output, the resistance values ​​of the resistors RS1 and RS2 can be adjusted to adapt, thereby reducing costs, and the application circuit has a wide range of applications. According to the application scenario, the constant current output can be adjusted accordingly, thereby ensuring that the brightness control of the LED is achieved at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The utility model is a circuit schematic diagram of a simple and low-cost circuit capable of changing the output current of a constant current power supply.

[0014] In the figure: 1- constant current chip circuit; 2- circuit for controlling constant current output size; 3- LED load circuit. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1 The utility model is shown as a simple and low-cost circuit that can change the output current of a constant current power supply, including a constant current chip circuit 1, a circuit 2 for controlling the constant current output size and an LED load circuit 3. The constant current chip circuit includes a constant current chip U1, and the circuit 2 for controlling the constant current output size includes a field effect tube M1. The fourth pin of the constant current chip U1 is connected to the D end of the field effect tube M1 through a resistor RS1, and the fourth pin of the constant current chip U1 is grounded through a resistor RS2. The fourth pin of the constant current chip U1 is a current setting pin, and the G end of the field effect tube M1 is connected to the signal input end VDD-EN through a resistor R3. The fourth pin of the constant current chip U1 is connected to the D end of the field effect tube M1 through the resistor RS1, and the fourth pin of the constant current chip U1 is grounded through the resistor RS2. The fourth pin of the constant current chip U1 is the current setting pin. U1 starts to work when the positive pole IN of the power input is input. When there is no signal at the signal input terminal VDD-EN, the fourth pin (current setting pin) of the constant current chip U1 only has the resistor RS2 to adjust the constant current output current; when there is a signal at the signal input terminal VDD-EN, the field effect tube M1 is turned on. At this time, the resistor RS1 connected to the fourth pin of the constant current chip U1 is also turned on to the ground and connected in parallel with the resistor RS2. The detection resistance value of the fourth pin on the constant current chip U1 changes, thereby changing the size of the constant current output current, making the circuit structure simple, and the constant current output current has strong applicability. When outputting different currents, it can be adapted by adjusting the resistance values ​​of the resistors RS1 and RS2, thereby reducing costs and having a wide range of application circuits. According to the application scenarios, the constant current output can be adjusted accordingly, thereby ensuring that the brightness control of the LED is achieved at a low cost.

[0017] As a specific implementation, the model of the constant current chip U1 is Hi2601B, which has low cost and precise current control.

[0018] The constant current chip circuit also includes a polarity capacitor EC1. The first pin of the constant current chip U1 is connected to the positive power input IN through a resistor R1. The first pin of the constant current chip U1 is grounded through a capacitor C1. The positive pole of the polarity capacitor EC1 is connected to the positive power input IN. The negative pole of the polarity capacitor EC1 is grounded, thereby improving the stability and safety of the current input.

[0019] The constant current chip circuit also includes a diode D1, the LED load circuit includes a lamp LED1, the fifth pin and the sixth pin of the constant current chip U1 are both connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the positive electrode IN of the power input, the fifth pin and the sixth pin of the constant current chip U1 are both connected to the negative electrode of the DC output through the inductor L1, the positive electrode of the DC output is connected to the positive electrode IN of the power input, the positive electrode of the DC output is connected to the positive electrode of the lamp LED1, and the negative electrode of the DC output is connected to the negative electrode of the lamp LED1, thereby improving the stability and safety of the current output.

[0020] The S end of the field effect tube M1 is grounded, and the S end of the field effect tube M1 is connected to the G end of the field effect tube M1 through the resistor R4, so as to improve the working safety of the field effect tube M1.

[0021] The seventh pin and the eighth pin of the constant current chip U1 are both grounded, thereby improving the working safety of the constant current chip U1.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A simple and low-cost circuit for changing the output current of a constant current power supply, characterized in that: It includes a constant current chip circuit, a circuit for controlling the constant current output size and an LED load circuit. The constant current chip circuit includes a constant current chip U1. The circuit for controlling the constant current output size includes a field effect tube M1. The fourth pin of the constant current chip U1 is connected to the D end of the field effect tube M1 through a resistor RS1. The fourth pin of the constant current chip U1 is grounded through a resistor RS2. The fourth pin of the constant current chip U1 is a current setting pin. The G end of the field effect tube M1 is connected to the signal input end VDD-EN through a resistor R3.

2. The simple and low-cost circuit capable of changing the output current of a constant current power supply according to claim 1, characterized in that: The model of the constant current chip U1 is Hi2601B.

3. The simple and low-cost circuit capable of changing the output current of a constant current power supply according to claim 1 is characterized in that: The constant current chip circuit also includes a polarity capacitor EC1. The first pin of the constant current chip U1 is connected to the positive power input IN through a resistor R1. The first pin of the constant current chip U1 is grounded through a capacitor C1. The positive pole of the polarity capacitor EC1 is connected to the positive power input IN, and the negative pole of the polarity capacitor EC1 is grounded.

4. The simple and low-cost circuit capable of changing the output current of a constant current power supply according to claim 1 is characterized in that: The constant current chip circuit also includes a diode D1, and the LED load circuit includes a lamp LED1. The fifth pin and the sixth pin of the constant current chip U1 are both connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected to the positive electrode IN of the power input. The fifth pin and the sixth pin of the constant current chip U1 are both connected to the negative electrode of the DC output through the inductor L1, and the positive electrode of the DC output is connected to the positive electrode IN of the power input, and the positive electrode of the DC output is connected to the positive electrode of the lamp LED1, and the negative electrode of the DC output is connected to the negative electrode of the lamp LED1.

5. The simple and low-cost circuit capable of changing the output current of a constant current power supply according to claim 1 is characterized in that: The S end of the field effect tube M1 is grounded, and the S end of the field effect tube M1 is connected to the G end of the field effect tube M1 through a resistor R4.

6. The simple and low-cost circuit capable of changing the output current of a constant current power supply according to claim 1 is characterized in that: The seventh pin and the eighth pin of the constant current chip U1 are both grounded.