Constant-current LED driving chip

Abstract

The utility model discloses a constant-current LED driving chip, which belongs to the technical field of LED illumination, aims at solving the problems that the LED current cannot be accurately controlled and the application range is not wide, and comprises a chip body and mounting pins, and the mounting pins are arranged on the periphery of the chip body. A power management unit, an output current control unit, a current detection unit and a driving circuit unit are integrated in the chip body, and the power management unit is mainly responsible for processing input voltage and converting input direct-current power into voltage suitable for driving an LED; the output current control unit measures and controls the LED current through a current feedback loop; according to the utility model, the accurate control of the LED current is realized through the current feedback loop, the constant current output of the LED lamp is ensured, the stability of the LED lamp is ensured, the service life of the LED lamp is prolonged, and meanwhile, the driving chip has the advantages of high efficiency, low power consumption, wide voltage input range and the like, and can adapt to different working environments and requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED lighting, and specifically relates to a constant current LED driving chip. Background Art

[0002] Chips are also called microcircuits, microchips, wafers, and integrated circuits. In electronics, they are a way to miniaturize circuits (mainly semiconductor devices, but also passive components, etc.), and are often manufactured on the surface of semiconductor wafers. After the invention and mass production of transistors, various solid-state semiconductor components such as diodes and transistors were used in large quantities, replacing the functions and roles of vacuum tubes in circuits. In the mid-to-late 20th century, advances in semiconductor manufacturing technology made integrated circuits possible. Compared with hand-assembled circuits using individual discrete electronic components, integrated circuits can integrate a large number of microtransistors into a small chip, which is a huge improvement.

[0003] A linear constant current LED driver chip with patent announcement number CN213244420U in the prior art includes a chip body, a first pin is arranged on the upper left side of the chip body, the first pin is connected to the power supply end, a second pin is arranged on the lower left side of the chip body, the second pin is connected to the source end of the internal high-voltage MOS tube, a third pin is arranged on the upper right side of the chip body, the third pin is connected to the ground end, a fourth pin is arranged on the lower right side of the chip body, and the chip body is integrated with an overheat protection module, a voltage detection module, a linear constant current circuit module, an output overvoltage protection module, a voltage detection module, a linear constant current circuit module, and an output overvoltage protection module. Protection module, output short-circuit protection module and drive circuit module. When the voltage of the feedback signal input terminal is greater than 2.2V, the voltage detection module will judge it as output overvoltage protection and lock it. When the output overvoltage protection module detects that the output is open, it will turn off the internal high-voltage M0S and lock it until the power is restarted. However, there are still the following deficiencies in actual use: From a practical point of view, the device cannot accurately control the LED current when in use, thereby failing to ensure the constant current output of the LED lamp, reducing its service life. At the same time, it does not have high efficiency, low power consumption and a wide voltage input range, and cannot adapt to different working environments and requirements.

[0004] Therefore, a constant current LED driver chip is needed to solve the problems in the prior art that the LED current cannot be accurately controlled and the adaptability range is limited. Utility Model Content

[0005] The purpose of the utility model is to provide a constant current LED driver chip to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a constant current LED driver chip, comprising a chip body and mounting pins, wherein the mounting pins are arranged around the chip body, and a power management unit, an output current control unit, a current detection unit and a driving circuit unit are integrated in the chip body;

[0007] The power management unit is mainly responsible for processing the input voltage and converting the input DC power into a voltage suitable for driving the LED;

[0008] The output current control unit measures and controls the LED current through a current feedback loop to achieve stable and adjustable output current;

[0009] The current detection unit can detect the magnitude of the LED current in real time and feed it back to the output current control unit to achieve constant current output;

[0010] The driving circuit unit includes a power switch and a filter circuit.

[0011] It should be noted that the power management unit includes a linear step-down circuit to step down the input DC power supply to a voltage suitable for driving the LED.

[0012] It is further worth noting that the current detection unit uses a current sensor or a resistor to detect the current. The current detection unit can use a current sensor or a resistor to detect the current, and then process the detected current signal through an amplification circuit and a filtering circuit, and finally send it to the output current control unit.

[0013] It should be further explained that the output current control unit is connected to an external signal and can be adjusted according to the external signal to control the magnitude of the output current.

[0014] As a preferred implementation, the power switch adjusts the output current by controlling the on and off of the switch tube, and the filter circuit is used to smooth the output current to avoid excessive pulsation.

[0015] As a preferred implementation, a temperature sensor and an over-temperature protection circuit are provided in the driving circuit unit.

[0016] Compared with the prior art, the constant current LED driver chip provided by the present invention has at least the following beneficial effects:

[0017] The precise control of LED current is achieved through the current feedback loop, ensuring the constant current output of the LED lamp, thereby ensuring the stability of the LED lamp and extending its service life. At the same time, the driver chip also has the advantages of high efficiency, low power consumption and wide voltage input range, and can adapt to different working environments and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is the structural logic block diagram of the utility model;

[0020] Figure 3 This is a logic block diagram of the current detection unit structure of the utility model;

[0021] Figure 4 This is a structural block diagram of the drive circuit unit of the utility model.

[0022] In the figure: 1. Chip body; 11. Power management unit; 12. Output current control unit; 13. Current detection unit; 14. Drive circuit unit; 141. Power switch; 142. Filter circuit; 2. Mounting pins. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] See also Figure 1-4 The utility model provides a constant current LED driver chip, including a chip body 1 and mounting pins 2, the mounting pins 2 are arranged around the chip body 1, and the chip body 1 is integrated with a power management unit 11, an output current control unit 12, a current detection unit 13 and a driving circuit unit 14;

[0025] The power management unit 11 is mainly responsible for processing the input voltage and converting the input DC power into a voltage suitable for driving the LED. When the DC power is connected, the power management unit 11 will first process it. According to the driving requirements of the LED lamp, the power management unit 11 will convert the input DC power into a suitable voltage value. This step ensures that the LED lamp can work under a stable and safe voltage. The power management unit 11 also has the ability of a wide voltage input range, which enables the driver chip to adapt to different power supply environments and improves its adaptability and flexibility.

[0026] The output current control unit 12 measures and controls the LED current through a current feedback loop to achieve stable and adjustable output current. The output current control unit 12 is the core part of the driver chip, which includes a standard voltage setting circuit and an error amplifier.

[0027] During real-time operation, the output current control unit 12 will continuously compare the current signal sent by the current detection unit 13 with a preset standard voltage. When there is a deviation between the detected current signal and the standard voltage, the error amplifier will output a control signal to the drive circuit unit 14.

[0028] The size and direction of the control signal depend on the size and direction of the current deviation. By adjusting the size and direction of the control signal, the power switch 141 in the driving circuit unit 14 can be accurately controlled, thereby achieving real-time regulation of the LED current.

[0029] The current detection unit 13 can detect the LED current in real time and feed it back to the output current control unit 12 to achieve constant current output;

[0030] In the real-time working process, the current detection unit 13 will continuously monitor the LED current. It uses a high-precision current sensor or sampling resistor to sample the LED current in real time and convert it into a voltage signal.

[0031] After being processed by the amplifier circuit and the filter circuit, this voltage signal will be sent to the output current control unit 12. The amplifier circuit ensures that the detected current signal is strong enough to be accurately processed, while the filter circuit is used to reduce noise and interference in the signal and improve the accuracy of the signal.

[0032] The driving circuit unit 14 includes a power switch 141 and a filter circuit 142 . The power switch 141 is turned on and off according to a control signal of the output current control unit 12 , thereby adjusting the magnitude of the output current.

[0033] The filter circuit 142 is used to smooth the output current and reduce ripple and noise, which helps to maintain the stability of the LED lamp and increase its service life.

[0034] Further Figure 2 , Figure 3 and Figure 4 As shown, it is worth to explain in detail that the power management unit 11 includes a linear step-down circuit to step down the input DC power supply to a voltage suitable for driving the LED.

[0035] Further Figure 2 , Figure 3 and Figure 4 As shown, it is worth specifically explaining that the current detection unit 13 uses a current sensor or a resistor to detect the current. The current detection unit 13 can use a current sensor or a resistor to detect the current, and then process the detected current signal through an amplification circuit and a filtering circuit, and finally send it to the output current control unit 12.

[0036] Further Figure 2 , Figure 3 and Figure 4 As shown, it is worth to explain in detail that the output current control unit 12 is connected to the external signal and can be adjusted according to the external signal to control the magnitude of the output current.

[0037] Further Figure 2 , Figure 3 and Figure 4 As shown, it is worth explaining in detail that the power switch 141 adjusts the output current by controlling the on and off of the switch tube, and the filter circuit 142 is used to smooth the output current to avoid excessive pulsation.

[0038] Embodiment 1:

[0039] The current detection unit 13 uses a current sensor to detect the LED current in real time, and converts the detected current signal into a voltage signal. After the voltage signal is processed by the amplification circuit and the filtering circuit, it is sent to the output current control unit 12. The standard voltage setting circuit in the output current control unit 12 presets a standard voltage value, compares the detected current signal with the standard voltage, and outputs a control signal to the drive circuit unit 14 through the error amplifier. The power switch in the drive circuit unit 14 adjusts its conduction and cutoff according to the control signal, thereby realizing precise control of the LED current.

[0040] Embodiment 2:

[0041] In order to further improve the stability of the LED lamp and extend its service life, a temperature sensor and an over-temperature protection circuit can also be added to the driving circuit unit 14. The temperature sensor monitors the temperature of the LED lamp in real time and sends a temperature signal to the over-temperature protection circuit. When the temperature exceeds the set threshold, the over-temperature protection circuit will automatically reduce the output current or shut down the driving circuit to prevent the LED lamp from overheating and damage, thereby protecting the working stability and life of the LED.

[0042] This solution has the following working process: when this device is used, the power management unit 11 converts the input DC power supply into a voltage suitable for driving the LED, and outputs it to the driving circuit unit 14. The output current control unit 12 realizes constant current output to the LED lamp by controlling the power switch 141 in the driving circuit unit 14 according to the LED current signal detected by the current detection unit 13. The temperature sensor monitors the temperature of the LED lamp in real time and sends the temperature signal to the over-temperature protection circuit. When the temperature exceeds the set threshold, the over-temperature protection circuit will automatically reduce the output current or shut down the driving circuit to prevent the LED lamp from being damaged by overheating.

[0043] In summary: precise control of LED current is achieved through the current feedback loop, ensuring the constant current output of the LED lamp. The constant current output design ensures the stability and long life of the LED lamp, while reducing the damage caused by current fluctuations. Efficient power management and low power consumption characteristics make energy conversion more efficient and reduce energy waste. The wide voltage input range enhances the adaptability and flexibility of the chip and is suitable for a variety of lighting scenarios. In addition, the integrated over-temperature protection circuit provides additional safety for LED lamps to prevent overheating damage. Its efficient, stable, safe and reliable performance provides strong support for the development of LED lighting technology and has broad market application prospects.

Claims

1. A constant current LED driver chip, comprising a chip body (1) and mounting pins (2), characterized in that: The mounting pins (2) are arranged around the chip body (1), and the chip body (1) is integrated with a power management unit (11), an output current control unit (12), a current detection unit (13) and a drive circuit unit (14); The power management unit (11) is mainly responsible for processing the input voltage and converting the input DC power into a voltage suitable for driving the LED; The output current control unit (12) measures and controls the LED current through a current feedback loop to achieve stable and adjustable output current; The current detection unit (13) is capable of detecting the magnitude of the LED current in real time and feeding it back to the output current control unit (12) to achieve constant current output; The driving circuit unit (14) comprises a power switch (141) and a filter circuit (142).

2. A constant current LED driver chip according to claim 1, characterized in that: The power management unit (11) comprises a linear step-down circuit.

3. A constant current LED driver chip according to claim 1, characterized in that: The current detection unit (13) uses a current sensor or a resistor to detect the current.

4. The constant current LED driver chip according to claim 1, characterized in that: The output current control unit (12) is connected to an external signal.

5. The constant current LED driver chip according to claim 1, characterized in that: The power switch (141) adjusts the magnitude of the output current by controlling the on and off of the switch tube, and the filter circuit (142) is used to smooth the output current to avoid excessive pulsation.

6. The constant current LED driver chip according to claim 1, characterized in that: The driving circuit unit (14) is provided with a temperature sensor and an over-temperature protection circuit.

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