LED power supply circuit
By designing an LED power supply circuit including anti-interference module, input filter module, main control module, transformer module, output filter module and feedback module, the existing linear power supply problems are solved, and an efficient and small LED power supply circuit is realized.
Patent Information
- Application Number
- CN202420549835.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-20
AI Technical Summary
The power supply section of the existing LED lighting system uses linear power supply, which has low conversion efficiency, especially in full or heavy load situations. At the same time, the linear power supply requires larger filtering and buffering circuits, resulting in larger volume and is not conducive to carrying.
Design an LED power supply circuit, including an anti-interference module, an input filter module, a main control module, a transformer module, an output filter module and a feedback module. Through the combination of these modules, it replaces the traditional linear power supply, improves the conversion efficiency, simplifies the circuit structure and reduces the volume.
It achieves the effect of improving the conversion efficiency of LED power supply, making the LED power supply section smaller and easier to carry, while ensuring the normal operation and safety of the power supply board.
Smart Images
Figure CN222638734U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit design, in particular to an LED power supply circuit. Background Art
[0002] The power supply module of the LED lighting system is a key part of the entire system, and its performance directly affects the overall electrical performance efficiency, safety and service life of the LED lighting system.
[0003] In the related art, 200W LED lamp power products generally use linear power supplies, which generally use continuous linear regulation, resulting in relatively low conversion efficiency, especially under full load or heavy load conditions. At the same time, since linear power supplies require larger filtering and buffering circuits, they are larger in size and not easy to carry. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an LED power supply circuit that can replace a linear power supply, improve conversion efficiency, and make the LED power supply panel more miniaturized.
[0005] The purpose of this utility model is achieved through the following technical solutions:
[0006] In a first aspect, the present application provides an LED power supply circuit, comprising: an anti-interference module; an input filter module, the input filter module is electrically connected to the anti-interference module; a main control module, the main control module includes an IC unit, the IC unit is electrically connected to the input filter module; a transformer module, the transformer module is electrically connected to the IC unit; an output filter module, the output filter module is electrically connected to the transformer module; and a feedback module, the feedback module is electrically connected to the IC unit.
[0007] The IC unit includes a chip sub-unit, a MOS transistor Q1 and a MOS transistor Q2. The chip sub-unit is electrically connected to the MOS transistor Q1 and the MOS transistor Q2 respectively. The MOS transistor Q1 is electrically connected to the input filter module.
[0008] The main control module further includes an inductor T1 , a first end of the inductor T1 is electrically connected to the MOS tube Q2 , and a second end of the inductor T1 is electrically connected to the transformer module.
[0009] The main control module also includes an overvoltage protection unit, which includes a resistor R9, a resistor R10, a resistor R11 and a resistor R12. The first end of the resistor R9 is electrically connected to the first end of the resistor R11, the second end of the resistor R9 is electrically connected to the second end of the resistor R11, the first end of the resistor R10 is electrically connected to the first end of the resistor R11, the second end of the resistor R10 is electrically connected to the second end of the resistor R11, the first end of the resistor R12 is electrically connected to the first end of the resistor R9, and the second end of the resistor R12 is electrically connected to the MOS tube Q2.
[0010] The main control module also includes a peak absorption unit, which includes a diode D5, a resistor R24 and a capacitor C11. The first end of the diode D5 is electrically connected to the first end of the resistor R24, the second end of the diode D5 is electrically connected to the transformer module, the second end of the resistor R24 is electrically connected to the first end of the capacitor C11, the second end of the capacitor C11 is grounded, and the second end of the resistor R24 is also electrically connected to the chip sub-unit.
[0011] The main control module further includes a resistor R23, a first end of the resistor R23 is electrically connected to the chip sub-unit, and a second end of the resistor R23 is grounded.
[0012] The anti-interference module includes a thermistor NTC1, a fuse F1, a varistor TVR1 and an inductor L1. The thermistor NTC1 is electrically connected to a first end of the fuse F1, a second end of the fuse F1 is electrically connected to a first end of the varistor TVR1, a second end of the varistor TVR1 is electrically connected to the inductor L1, and the inductor L1 is electrically connected to the input filter module.
[0013] The input filter module includes a current bridge D1, a current bridge D2, a capacitor C1 and a capacitor C2. The current bridge D1 is electrically connected to the inductor L1, the current bridge D2 is electrically connected to the inductor L1, the first end of the capacitor C1 is electrically connected to the current bridge D1, the second end of the capacitor C1 is electrically connected to the current bridge D2, the first end of the capacitor C2 is electrically connected to the current bridge D1, the second end of the capacitor C2 is electrically connected to the current bridge D2, and the first end of the capacitor C2 is also electrically connected to the MOS tube Q1.
[0014] The feedback module includes an optical coupler U2, and the optical coupler U2 is electrically connected to the chip sub-unit.
[0015] The output filter module includes a diode D6, a diode D7, a capacitor C15, a capacitor C17 and an output end, the first end of the diode D6 is electrically connected to the transformer module, the second end of the diode D6 is electrically connected to the first end of the capacitor C15, the first end of the diode D7 is electrically connected to the transformer module, the second end of the diode D7 is electrically connected to the second end of the capacitor C15, the first end of the capacitor C17 is electrically connected to the first end of the capacitor C15, the second end of the capacitor C17 is electrically connected to the second end of the capacitor C15, and the first end of the capacitor C17 and the second end of the capacitor C17 are also electrically connected to the output end respectively.
[0016] Compared with the prior art, the utility model has at least the following advantages:
[0017] By setting up an anti-interference module, an input filter module, a main control module, a transformer module, an output filter module and a feedback module, the anti-interference module plays a role in protection and isolation and anti-interference, the input filter module plays a role in converting 220V AC into pulsating DC, and performs rectification and filtering, the main control module is the core module of the power supply, the transformer module can achieve the role of voltage reduction, the output filter module plays a role of rectification and filtering, and the feedback module is used to feed back the optical coupler signal to the main control module, so that the main control module can self-regulate and make the entire power board work normally. The above replaces the traditional linear power supply, which can not only improve the conversion efficiency, but also has a very simple circuit structure, a small size, and is easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.
[0019] Figure 1 This is a functional module diagram of an LED power supply circuit in an embodiment of the present utility model;
[0020] Figure 2 Detailed description of the invention The invention is a circuit diagram of an LED power supply circuit in one embodiment of the invention. DETAILED DESCRIPTION
[0021] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0023] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0024] In the related art, 200W LED lamp power products generally use linear power supplies, which generally use continuous linear regulation, resulting in relatively low conversion efficiency, especially under full load or heavy load conditions. At the same time, since linear power supplies require larger filtering and buffering circuits, they are larger in size and not easy to carry.
[0025] In view of the above problems, an embodiment of the present application provides an LED power supply circuit, which can replace a linear power supply, improve conversion efficiency, and make the LED power supply panel more miniaturized.
[0026] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.
[0027] See also Figure 1 , an LED power supply circuit, including: an anti-interference module 100, an input filter module 200, a main control module 300, a transformer module 400, an output filter module 500 and a feedback module 600, the input filter module 200 is electrically connected to the anti-interference module 100; the main control module 300 includes an IC unit, the IC unit is electrically connected to the input filter module 200; the transformer module 400 is electrically connected to the IC unit; the output filter module 500 is electrically connected to the transformer module 400; the feedback module 600 is electrically connected to the IC unit.
[0028] It should be noted that the IC unit includes a chip subunit, a MOS tube Q1 and a MOS tube Q2, the chip subunit is electrically connected to the MOS tube Q1 and the MOS tube Q2 respectively, the MOS tube Q1 is electrically connected to the input filter module 200, and the chip subunit is a controller. Specifically, the chip subunit adopts the model LZC3106A, which is a high-precision resonant mode double-end controller for the control application of the LLC half-bridge resonant circuit. It can provide a 50% complementary duty cycle, control the high-voltage side switch and the low-voltage side switch, and the MOS tube Q1 and the MOS tube Q2 are turned on / off in a 180° anti-phase manner in exactly the same time. The controller achieves modulation and stabilization of the output voltage by adjusting the system operating frequency. Furthermore, LZC3106A adopts a novel MOSFET zero voltage detection method, inserts an adaptive dead time between the turn-off and turn-on of the two MOSFETs, effectively avoids the overlap of the opening or closing of the two MOS tubes causing damage to the transistor, and ensures the system soft switching, low EMI and high efficiency. At the same time, in order to prevent the output voltage from overshooting during startup, LZC3106A provides a settable soft start process, which starts the switching frequency from the set maximum value and then gradually decays to the steady-state resonant frequency point controlled by the loop, while also avoiding the uncontrolled impact current at startup. LZC3106A provides programmable burst mode control under no-load or light load, which can minimize magnetizing current loss and frequency-related loss. The temperature foldback function in which the output current decreases with increasing temperature can keep the system working in a high temperature environment. LZC3106A is a highly integrated controller that uses a SOP16 package to simplify system design. The internal oscillator supports switching frequencies from 40kHz to 400kHz.
[0029] By setting the anti-interference module 100, the input filter module 200, the main control module 300, the transformer module 400, the output filter module 500 and the feedback module 600, the anti-interference module 100 plays a role in protection and isolation and anti-interference, the input filter module 200 plays a role in converting 220V AC into pulsating DC, and performs rectification and filtering, the main control module 300 is the core module of the power supply, the transformer module 400 can achieve the role of voltage reduction, the output filter module 500 plays a role of rectification and filtering, and the feedback module 600 is used to feed back the optical coupler signal to the main control module 300, so that the main control module 300 can self-regulate and make the entire power board work normally. The above replaces the traditional linear power supply, which can not only improve the conversion efficiency, but also has a very simple circuit structure, a small size, and is easy to carry.
[0030] See also Figure 2 Specifically, the main control module 300 also includes an inductor T1 , a first end of the inductor T1 is electrically connected to the MOS tube Q2 , and a second end of the inductor T1 is electrically connected to the transformer module 400 .
[0031] See also Figure 2 Specifically, the main control module 300 also includes an overvoltage protection unit, which includes a resistor R9, a resistor R10, a resistor R11 and a resistor R12. The first end of the resistor R9 is electrically connected to the first end of the resistor R11, the second end of the resistor R9 is electrically connected to the second end of the resistor R11, the first end of the resistor R10 is electrically connected to the first end of the resistor R11, the second end of the resistor R10 is electrically connected to the second end of the resistor R11, the first end of the resistor R12 is electrically connected to the first end of the resistor R9, and the second end of the resistor R12 is electrically connected to the MOS tube Q2.
[0032] It should be noted that resistors R9, R10, R11 and R12 are sampling resistors, which play the role of overcurrent protection for the chip sub-unit load. When the chip of the chip sub-unit detects that the current exceeds the preset threshold, the overcurrent protection function will be triggered and the power output will be immediately shut down, thereby avoiding circuit damage due to excessive current and ensuring the safety of the equipment.
[0033] See also Figure 2 Specifically, the main control module 300 also includes a peak absorption unit, which includes a diode D5, a resistor R24 and a capacitor C11. The first end of the diode D5 is electrically connected to the first end of the resistor R24, the second end of the diode D5 is electrically connected to the transformer module 400, the second end of the resistor R24 is electrically connected to the first end of the capacitor C11, the second end of the capacitor C11 is grounded, and the second end of the resistor R24 is also electrically connected to the chip sub-unit.
[0034] It should be noted that the diode D5, the resistor R24 and the capacitor C11 form a peak absorption circuit for absorbing the peak current, buffering and preventing current breakdown, and keeping the power device away from the dangerous working area, thereby effectively improving the reliability.
[0035] See also Figure 2 Specifically, the main control module 300 further includes a resistor R23, a first end of the resistor R23 is electrically connected to the chip sub-unit, and a second end of the resistor R23 is grounded.
[0036] It should be noted that resistor R23 is a thermistor. When the resistance R23 is reduced and the over-temperature protection voltage is lower than one tenth of the chip sub-unit VCC voltage, the chip in the chip sub-unit will begin to reduce the output current. When an abnormal state occurs and the temperature soars, the chip will enter over-temperature protection in advance to prevent damage to the chip and other components.
[0037] See also Figure 2Specifically, the anti-interference module 100 includes a thermistor NTC1, a fuse F1, a varistor TVR1 and an inductor L1, the thermistor NTC1 is electrically connected to a first end of the fuse F1, the second end of the fuse F1 is electrically connected to a first end of the varistor TVR1, the second end of the varistor TVR1 is electrically connected to the inductor L1, and the inductor L1 is electrically connected to the input filter module 200.
[0038] It should be noted that the setting of fuse F1 is to melt when a large current appears in the current, so as to protect the circuit from burning. Varistor TVR1 Zhu Yong is used to clamp the voltage when a spike voltage appears in the circuit during thunderstorms, absorbing excess current to protect electronic devices. Thermistor NTC1 is also called negative temperature coefficient resistor. It has a large resistance at room temperature and can play a good current limiting role at the moment of power-on.
[0039] See also Figure 2 In one embodiment, the input filter module 200 includes a current bridge D1, a current bridge D2, a capacitor C1 and a capacitor C2, the current bridge D1 is electrically connected to the inductor L1, the current bridge D2 is electrically connected to the inductor L1, the first end of the capacitor C1 is electrically connected to the current bridge D1, the second end of the capacitor C1 is electrically connected to the current bridge D2, the first end of the capacitor C2 is electrically connected to the current bridge D1, the second end of the capacitor C2 is electrically connected to the current bridge D2, and the first end of the capacitor C2 is also electrically connected to the MOS tube Q1.
[0040] It should be noted that the current bridge D1 and the current bridge D2 are used to convert the input 220V AC power into pulsating DC power at 310V to 320V. The capacitors C1 and C2 are used to rectify and filter the pulsating DC power.
[0041] See also Figure 2 In one embodiment, the feedback module 600 includes an optical coupler U2 , and the optical coupler U2 is electrically connected to the chip sub-unit.
[0042] It should be noted that the optocoupler U2 uses light as a medium to transmit electrical signals, so that the transmission of electrical signals can be achieved even when the primary and secondary sides of the transformer are isolated. Specifically, when the voltage regulator detects abnormal fluctuations in the output voltage, it will feedback the situation to the optocoupler U2, and then the optocoupler U2 will feedback the signal to the chip sub-unit. The chip sub-unit will adjust itself to achieve normal operation of the power board.
[0043] See also Figure 2In one embodiment, the output filter module 500 includes a diode D6, a diode D7, a capacitor C15, a capacitor C17 and an output end, the first end of the diode D6 is electrically connected to the transformer module 400, the second end of the diode D6 is electrically connected to the first end of the capacitor C15, the first end of the diode D7 is electrically connected to the transformer module 400, the second end of the diode D7 is electrically connected to the second end of the capacitor C15, the first end of the capacitor C17 is electrically connected to the first end of the capacitor C15, the second end of the capacitor C17 is electrically connected to the second end of the capacitor C15, and the first end of the capacitor C17 and the second end of the capacitor C17 are also electrically connected to the output end respectively.
[0044] It should be noted that the unidirectional conductivity of the diode D6 and the diode D7 is utilized to perform a rectification function, the capacitor C15 and the capacitor C17 are utilized to perform a filtering function, and the output end is connected to a 200W LED lamp.
[0045] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.
[0046] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. An LED power supply circuit, characterized in that: include: Anti-interference module; An input filter module, the input filter module is electrically connected to the anti-interference module; A main control module, the main control module comprising an IC unit, the IC unit being electrically connected to the input filter module; A transformer module, the transformer module being electrically connected to the IC unit; An output filter module, the output filter module is electrically connected to the transformer module; A feedback module is electrically connected to the IC unit.
2. The LED power supply circuit according to claim 1, characterized in that: The IC unit includes a chip sub-unit, a MOS transistor Q1 and a MOS transistor Q2. The chip sub-unit is electrically connected to the MOS transistor Q1 and the MOS transistor Q2 respectively. The MOS transistor Q1 is electrically connected to the input filter module.
3. The LED power supply circuit according to claim 2, characterized in that: The main control module further includes an inductor T1 , a first end of the inductor T1 is electrically connected to the MOS tube Q2 , and a second end of the inductor T1 is electrically connected to the transformer module.
4. The LED power supply circuit according to claim 2, characterized in that: The main control module also includes an overvoltage protection unit, which includes a resistor R9, a resistor R10, a resistor R11 and a resistor R12. The first end of the resistor R9 is electrically connected to the first end of the resistor R11, the second end of the resistor R9 is electrically connected to the second end of the resistor R11, the first end of the resistor R10 is electrically connected to the first end of the resistor R11, the second end of the resistor R10 is electrically connected to the second end of the resistor R11, the first end of the resistor R12 is electrically connected to the first end of the resistor R9, and the second end of the resistor R12 is electrically connected to the MOS tube Q2.
5. The LED power supply circuit according to claim 2, characterized in that: The main control module also includes a peak absorption unit, which includes a diode D5, a resistor R24 and a capacitor C11. The first end of the diode D5 is electrically connected to the first end of the resistor R24, the second end of the diode D5 is electrically connected to the transformer module, the second end of the resistor R24 is electrically connected to the first end of the capacitor C11, the second end of the capacitor C11 is grounded, and the second end of the resistor R24 is also electrically connected to the chip sub-unit.
6. The LED power supply circuit according to claim 5, characterized in that: The main control module further includes a resistor R23, a first end of the resistor R23 is electrically connected to the chip sub-unit, and a second end of the resistor R23 is grounded.
7. The LED power supply circuit according to claim 5, characterized in that: The anti-interference module includes a thermistor NTC1, a fuse F1, a varistor TVR1 and an inductor L1. The thermistor NTC1 is electrically connected to a first end of the fuse F1, a second end of the fuse F1 is electrically connected to a first end of the varistor TVR1, a second end of the varistor TVR1 is electrically connected to the inductor L1, and the inductor L1 is electrically connected to the input filter module.
8. The LED power supply circuit according to claim 7, characterized in that: The input filter module includes a current bridge D1, a current bridge D2, a capacitor C1 and a capacitor C2. The current bridge D1 is electrically connected to the inductor L1, the current bridge D2 is electrically connected to the inductor L1, the first end of the capacitor C1 is electrically connected to the current bridge D1, the second end of the capacitor C1 is electrically connected to the current bridge D2, the first end of the capacitor C2 is electrically connected to the current bridge D1, the second end of the capacitor C2 is electrically connected to the current bridge D2, and the first end of the capacitor C2 is also electrically connected to the MOS tube Q1.
9. The LED power supply circuit according to claim 8, characterized in that: The feedback module includes an optical coupler U2, and the optical coupler U2 is electrically connected to the chip sub-unit.
10. The LED power supply circuit according to claim 9, characterized in that: The output filter module includes a diode D6, a diode D7, a capacitor C15, a capacitor C17 and an output end, the first end of the diode D6 is electrically connected to the transformer module, the second end of the diode D6 is electrically connected to the first end of the capacitor C15, the first end of the diode D7 is electrically connected to the transformer module, the second end of the diode D7 is electrically connected to the second end of the capacitor C15, the first end of the capacitor C17 is electrically connected to the first end of the capacitor C15, the second end of the capacitor C17 is electrically connected to the second end of the capacitor C15, and the first end of the capacitor C17 and the second end of the capacitor C17 are also electrically connected to the output end respectively.