Adjustable light source intelligent driving module circuit

Abstract

The utility model discloses an adjustable light source intelligent drive module circuit, which comprises a primary rectification filter circuit, a high-frequency transformer, a constant current control circuit and a secondary rectification filter circuit, the secondary rectification filter circuit is in control connection with a drive control chip IC2, a GATE pin of the drive control chip IC2 is in control connection with an MOS tube Q2, and the MOS tube Q2 is in drive connection with an LED load; a constant-current control chip IC1 is arranged in the constant-current control circuit, and a GATE pin of the constant-current control chip IC1 is in control connection with the input end of the high-frequency transformer through an MOS tube Q1; and an FB voltage feedback pin of the constant current control chip IC1 is in control connection with the secondary rectification filter circuit through an optocoupler chip PC817. According to the utility model, a PWM mode, a PFM mode or a PSM mode can be selected according to the change of an LED load, and stable constant current can be adaptively adjusted and output; the circuit has low standby power consumption, high conversion efficiency and high reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of LED power drive circuits, in particular to an adjustable light source intelligent drive module circuit. Background Art

[0002] LED drive circuits that use PWM pulse width technology to achieve dimming are relatively common. Existing LED drive circuits usually include an AC / DC mains conversion circuit and a constant current chip control circuit with PWM dimming function. The PWM signal is input to the dimming pin of the constant current chip to control the conduction time of the switching transistor to adjust its output current, so as to achieve the purpose of LED drive dimming; when the PWM signal is Low, the constant current chip stops operating, no current flows through the LED, and the LED does not emit light.

[0003] The conversion efficiency of this PWM pulse width dimming method is mainly determined by the switching on-off frequency of the constant current chip. Conventional drive circuits are difficult to achieve large current output; moreover, after the control circuit (including peripheral circuits) of the constant current chip is designed, when the load power of LED lights and other loads changes (such as partial short circuit or open circuit of lamps in the circuit, or when the number of lamps is increased), its output current is difficult to adaptively adjust according to the change of the load, resulting in obvious brightness fluctuations in existing LED lights, and existing drive circuits have problems such as high standby power consumption, low conversion efficiency, and high drive circuit failure rate. Summary of the Utility Model

[0004] In order to solve the above problems, the purpose of the utility model is to provide an adjustable light source intelligent drive module circuit, which can select different working modes according to the change of the LED load, including PWM mode, PFM mode and PSM mode, and can adaptively adjust the output of a constant current of more than 12V 10A; moreover, it can ensure that the circuit has low standby power consumption, high conversion efficiency and high reliability.

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

[0006] An intelligent driving module circuit for an adjustable light source, comprising a primary rectification and filtering circuit, a high-frequency transformer, and a constant current control circuit. The input end of the primary rectification and filtering circuit is connected to the mains power supply. The output end of the primary rectification and filtering circuit is connected to the input end of the high-frequency transformer. The constant current control circuit is controllably connected to the high-frequency transformer. The output end of the high-frequency transformer is provided with a secondary rectification and filtering circuit, and the secondary rectification and filtering circuit is controllably connected to a driving control chip IC2. The GATE pin of the driving control chip IC2 is controllably connected to a MOS transistor Q2, and the MOS transistor Q2 is further drivingly connected to an LED load. A constant current control chip IC1 is provided in the constant current control circuit, and the GATE pin of the constant current control chip IC1 is controllably connected to the input end of the high-frequency transformer via a MOS transistor Q1. The FB voltage feedback pin of the constant current control chip IC1 is controllably connected to the secondary rectification and filtering circuit via an optocoupler chip PC817.

[0007] Further, the driving control chip IC2 is of the CK121 model.

[0008] Further, the GATE pin of the driving control chip IC2 is connected to the gate of the MOS transistor Q2. The source of the MOS transistor Q2 is connected to the CS pin of the driving control chip IC2. The drain of the MOS transistor Q2 is connected to one end of the LED load via an inductor L2.

[0009] Further, the DIM pin of the driving control chip IC2 is connected to a PWM control signal or a DC voltage signal. The VIN pin of the driving control chip IC2 is connected to the output end of the secondary rectification and filtering circuit.

[0010] Further, the secondary rectification and filtering circuit includes diodes D4, D5, an inductor L1, and capacitors C1, C2.

[0011] Further, the constant current control chip IC1 is a 6842-type pulse width modulation (PWM) control chip.

[0012] Further, the GATE pin of the constant current control chip IC1 is connected to the gate of the MOS transistor Q1 via a resistor R7. The source of the MOS transistor Q1 is connected to the CS current detection pin of the constant current control chip IC1 via a resistor R9. The drain of the MOS transistor Q1 is controllably connected to the input end of the high-frequency transformer. The VIN pin of the constant current control chip IC1 is connected to the AC input end of the primary rectification and filtering circuit via start-up resistors R2, R1. The VDD pin of the constant current control chip IC1 is connected to the feedback winding of the high-frequency transformer via resistors R11, D3.

[0013] Further, a diode D1 is connected in parallel across both ends of the resistor R7.

[0014] Further, the RT protection pin of the constant current control chip IC1 is grounded through a resistor R8 and a thermistor NTC.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the circuit of the utility model, there are a constant current control chip IC1 and a drive control chip IC2. The two chips cooperate with each other to select different working modes according to the change of the LED load, including PWM mode, PFM mode and PSM mode, and can adaptively adjust the output of a constant current above 12V10A; moreover, it can ensure that the circuit has low standby power consumption, high conversion efficiency and high reliability.

[0017] 2. The constant current control chip IC1 of the utility model is controlled and connected to the MOS transistor Q1, and can provide functions such as overload, overvoltage, overtemperature and short circuit protection in combination with the peripheral circuit; when the fault is eliminated after the circuit fails, it can automatically restart and automatically return to the protection mode.

[0018] 3. The drive control chip IC2 of the utility model is controlled and connected to the MOS transistor Q2, and can perform dimming in two ways of inputting DC voltage or PWM signal, with a wide dimming range; it can automatically adjust the frequency to control the current ripple to ensure a continuous constant current output; it can withstand high voltage input, without connecting step-down resistors and capacitors, reducing external components; the entire circuit has protection functions such as overtemperature and short circuit, ensuring the reliable and stable operation of the circuit. Description of the Drawings

[0019] Figure 1 It is the circuit schematic diagram of the adjustable light source intelligent drive module circuit of the utility model.

[0020] Description of the Reference Numerals:

[0021] 1. Primary rectification and filtering circuit; 2. High-frequency transformer; 3. Constant current control circuit; 4. Secondary rectification and filtering circuit. Detailed Embodiment

[0022] The following further describes the utility model in detail with reference to the drawings and specific embodiments:

[0023] See Figure 1As shown, the adjustable light source intelligent drive module circuit includes a primary rectification and filtering circuit 1, a high-frequency transformer 2, and a constant current control circuit 3. The input end of the primary rectification and filtering circuit 1 is connected to the mains power supply. The output end of the primary rectification and filtering circuit 1 is connected to the input end of the high-frequency transformer 2. The constant current control circuit 3 is controllably connected to the high-frequency transformer 2. The output end of the high-frequency transformer 2 is provided with a secondary rectification and filtering circuit 4. The secondary rectification and filtering circuit 4 includes diodes D4, D5, an inductor L1, and capacitors C1, C2. The secondary rectification and filtering circuit 4 is controllably connected to a drive control chip IC2. The drive control chip IC2 selects a CK121 model dimming chip. The GATE pin of the drive control chip IC2 is controllably connected to a MOS transistor Q2. The MOS transistor Q2 is further drivingly connected to an LED load. A constant current control chip IC1 is provided in the constant current control circuit 3. The GATE pin of the constant current control chip IC1 is controllably connected to the input end of the high-frequency transformer 2 through a MOS transistor Q1. The FB voltage feedback pin of the constant current control chip IC1 is controllably connected to the secondary rectification and filtering circuit 4 through an optocoupler chip PC817.

[0024] The GATE pin of the drive control chip IC2 is connected to the gate of the MOS transistor Q2. The source of the MOS transistor Q2 is connected to the CS pin of the drive control chip IC2. The drain of the MOS transistor Q2 is connected to one end of the LED load through an inductor L2. The DIM pin of the drive control chip IC2 is connected to a PWM control signal or a DC voltage signal. The VIN pin of the drive control chip IC2 is connected to the output end of the secondary rectification and filtering circuit 4.

[0025] The constant current control chip IC1 is a 6842 type pulse width modulation (PWM) control chip. The GATE pin of the constant current control chip IC1 is connected to the gate of the MOS transistor Q1 through a resistor R7. A diode D1 is connected in parallel across both ends of the resistor R7. The source of the MOS transistor Q1 is connected to the CS current detection pin of the constant current control chip IC1 through a resistor R9. The drain of the MOS transistor Q1 is controllably connected to the input end of the high-frequency transformer 2. The VIN pin of the constant current control chip IC1 is connected to the AC input end of the primary rectification and filtering circuit 1 through start-up resistors R2, R1. The VDD pin of the constant current control chip IC1 is connected to the feedback winding of the high-frequency transformer 2 through resistors R11, D3. The RT protection pin of the constant current control chip IC1 is grounded through a resistor R8 and a thermistor NTC.

[0026] The above are only the specific embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. An adjustable light source intelligent driving module circuit, comprising a primary rectifying and filtering circuit (1), a high-frequency transformer (2) and a constant current control circuit (3), wherein the input end of the primary rectifying and filtering circuit (1) is connected to the mains, the output end of the primary rectifying and filtering circuit (1) is connected to the input end of the high-frequency transformer (2), and the constant current control circuit (3) controls the high-frequency transformer (2), characterized in that: The output end of the high-frequency transformer (2) is provided with a secondary rectifier filter circuit (4), the secondary rectifier filter circuit (4) is connected to the drive control chip IC2, the GATE pin of the drive control chip IC2 is connected to the MOS tube Q2, and the MOS tube Q2 is connected to the LED load; the constant current control circuit (3) is provided with a constant current control chip IC1, the GATE pin of the constant current control chip IC1 is connected to the input end of the high-frequency transformer (2) through the MOS tube Q1; the FB voltage feedback pin of the constant current control chip IC1 is connected to the secondary rectifier filter circuit (4) through the optocoupler chip PC817.

2. The adjustable light source intelligent driving module circuit according to claim 1, characterized in that: The driving control chip IC2 is of model CK121.

3. The adjustable light source intelligent driving module circuit according to claim 1 or 2, characterized in that: The GATE pin of the driving control chip IC2 is connected to the gate of the MOS tube Q2, the source of the MOS tube Q2 is connected to the CS pin of the driving control chip IC2, and the drain of the MOS tube Q2 is connected to one end of the LED load via the inductor L2.

4. The adjustable light source intelligent driving module circuit according to claim 1 or 2, characterized in that: The DIM pin of the drive control chip IC2 is connected to a PWM control signal or a DC voltage signal, and the VIN pin of the drive control chip IC2 is connected to the output end of the secondary rectifier filter circuit (4).

5. The adjustable light source intelligent driving module circuit according to claim 1 or 2, characterized in that: The secondary rectification and filtering circuit (4) comprises diodes D4, D5, an inductor L1 and capacitors C1, C2.

6. The adjustable light source intelligent driving module circuit according to claim 1, characterized in that: The constant current control chip IC1 is a 6842 pulse width modulation PWM control chip.

7. The adjustable light source intelligent driving module circuit according to claim 1 or 6, characterized in that: The GATE pin of the constant current control chip IC1 is connected to the gate of the MOS tube Q1 via a resistor R7, the source of the MOS tube Q1 is connected to the CS current detection pin of the constant current control chip IC1 via a resistor R9, and the drain of the MOS tube Q1 is control-connected to the input end of the high-frequency transformer (2); the VIN pin of the constant current control chip IC1 is connected to the AC input end of the primary rectifier filter circuit (1) via start-up resistors R2 and R1; and the VDD pin of the constant current control chip IC1 is connected to the feedback winding of the high-frequency transformer (2) via resistors R11 and D3.

8. The adjustable light source intelligent driving module circuit according to claim 7, characterized in that: A diode D1 is connected in parallel across both ends of the resistor R7.

9. The adjustable light source intelligent driving module circuit according to claim 7, characterized in that: The RT protection pin of the constant current control chip IC1 is grounded through a resistor R8 and a thermistor NTC.

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