阅读说明：本技术 一种led变频驱动电源 (LED variable frequency driving power supply ) 是由 张继涛 张彦俊 张艺凡 刘胜泉 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种LED变频驱动电源,变频控制模块设置有高亮控制信号输入端和低亮控制信号输入端,变频控制模块与电源模块电性连接,当低亮控制信号输入端接收高电平信号时,变频控制模块根据高亮控制信号输入端接收电平信号的高低控制电源模块于高亮供电模式和低亮供电模式中切换,变频控制模块能够控制电源模块驱动LED灯低亮照明,定时保护模块与高亮控制信号输入端电性连接,定时保护模块能够在高亮控制信号输入端持续接收高电平信号的时长超过时长阈值时屏蔽高亮控制信号输入端接收到的高电平信号,能够避免LED灯的温度过高,进而避免LED灯发生光衰,延长LED灯的使用寿命。(The invention discloses an LED variable frequency driving power supply, a variable frequency control module is provided with a high brightness control signal input end and a low brightness control signal input end, the variable frequency control module is electrically connected with a power supply module, when the low-brightness control signal input end receives a high level signal, the variable frequency control module switches between a high-brightness power supply mode and a low-brightness power supply mode according to the high-low control power supply module receiving the level signal from the high-brightness control signal input end, the variable frequency control module can control the power supply module to drive the LED lamp to perform low-brightness illumination, the timing protection module is electrically connected with the high-brightness control signal input end, the timing protection module can shield the high level signal received by the high-brightness control signal input end when the duration of continuously receiving the high level signal at the high-brightness control signal input end exceeds a duration threshold value, the overhigh temperature of the LED lamp can be avoided, the LED lamp is prevented from light decay, and the service life of the LED lamp is prolonged.)

1. An LED variable frequency driving power supply is characterized by comprising:

the power supply module (100) is used for driving the LED lamp to illuminate;

the frequency conversion control module (200) is provided with a high brightness control signal input end and a low brightness control signal input end, the frequency conversion control module (200) is electrically connected with the power module (100), and when the low brightness control signal input end receives a high level signal, the frequency conversion control module (200) controls the power module (100) to switch between a high brightness power supply mode and a low brightness power supply mode according to the level of the high brightness control signal input end receiving the level signal;

the timing protection module (300) is electrically connected with the highlight control signal input end, and the timing protection module (300) can shield the high level signal received by the highlight control signal input end when the duration of the high level signal continuously received by the highlight control signal input end exceeds a duration threshold value.

2. The LED variable frequency drive power supply of claim 1, wherein: the timing protection module (300) comprises a timing unit (310) and a logic gate judgment unit (320), the timing unit (310) is electrically connected with the highlight control signal input end, the logic gate judgment unit (320) is respectively electrically connected with the highlight control signal input end, the timing unit (310) and the frequency conversion control module (200) to shield the high level signal received by the highlight control signal input end when the duration of continuously receiving the high level signal by the highlight control signal input end exceeds a duration threshold value.

3. The LED variable frequency drive power supply of claim 2, wherein: the timing unit (310) comprises a comparator U7, a power supply VCC, a resistor R53, a resistor R54, a resistor R55 and a capacitor C16, the logic gate judging unit (320) comprises an AND gate circuit U7, one end of the resistor R53 is electrically connected with the highlight control signal input end, the other end of the R53 is electrically connected with one end of the capacitor C16 and the negative electrode input end of the comparator U6 respectively, the other end of the capacitor C16 is electrically connected with the public ground, one end of the resistor R55 is electrically connected with the positive electrode input end of the comparator U6 and one end of the resistor R54 respectively, the other end of the resistor R55 is electrically connected with the public ground, the other end of the resistor R54 is electrically connected with the power supply VCC, a first input end of the AND gate circuit U7 is electrically connected with the output end of the comparator U6, a second input end of the AND gate circuit U7 is electrically connected with the highlight control signal input end, the output end of the AND gate circuit U7 is electrically connected with the frequency conversion control module (200).

4. The LED variable frequency driving power supply according to claim 3, wherein: the timing unit (310) further comprises a diode D10, wherein an anode of the diode D10 is electrically connected with one end of the resistor R53 far away from the highlight control signal input end, and a cathode of the diode D10 is electrically connected with one end of the resistor R53 near the highlight control signal input end.

5. The LED variable frequency drive power supply of claim 1, wherein: power module (100) includes rectification filter unit (110), power factor correction unit (120) and pressure regulating unit (130), rectification filter unit (110) respectively with the commercial power and power factor correction unit (120) electric connection, power factor correction unit (120) respectively with pressure regulating unit (130) and frequency conversion control module (200) electric connection is in order to save the electric energy, frequency conversion control module (200) with pressure regulating unit (130) electric connection is in order to can according to high bright control signal input and the control signal control that low bright control signal input received changes the output of pressure regulating unit (130).

6. The LED variable frequency driving power supply according to claim 5, wherein: frequency conversion control module (200) includes PWM signal generation unit (210) and frequency conversion drive unit (220), bright control signal input and low bright control signal input all locates PWM signal generation unit (210), PWM signal generation unit (210) with frequency conversion drive unit (220) electric connection, frequency conversion drive unit (220) respectively with power factor correction unit (120) and voltage regulating unit (130) electric connection, frequency conversion drive unit (220) can be according to the output signal change of PWM signal generation unit (210) the output of voltage regulating unit (130).

7. The LED variable frequency driving power supply according to claim 6, wherein: PWM signal generation unit (210) includes wiring socket CN4 and singlechip U5, bright control signal input of height and low bright control signal input all locate wiring socket CN4, singlechip U5's first input with bright control signal input electric connection of height, singlechip U5's second input with low bright control signal input electric connection, singlechip U5's output with frequency conversion drive unit (220) electric connection.

8. The LED variable frequency driving power supply according to claim 7, wherein: the variable frequency driving unit (220) comprises a dimming control chip U2, a photoelectric coupler U3 and a switch tube Q2, the output end of the single chip microcomputer U5 is electrically connected with the input end of a light emitter of the photoelectric coupler U3, the output end of a light receiver of the photoelectric coupler U3 is electrically connected with the PWM signal receiving end of the dimming control chip, the output end of the dimming control chip U2 is electrically connected with the controlled end of the switch tube Q2, the input end of the switch tube Q2 is electrically connected with the public ground, and the output end of the switch tube Q2 is electrically connected with the voltage regulating unit (130).

9. The LED variable frequency driving power supply according to claim 5, wherein: rectifier filter unit (110) includes fuse F1, inductance L1, inductance L2 and rectifier bridge BR1, fuse F1's one end and live wire electric connection, fuse F1's the other end with inductance L1's one end electric connection, inductance L1's the other end with rectifier bridge BR 1's first alternating current input end electric connection, inductance L2's one end and zero line electric connection, inductance L2's the other end with rectifier bridge BR 1's second alternating current input end electric connection, rectifier bridge BR 1's output respectively with power factor correction unit (120) and voltage regulating unit (130) electric connection.

Technical Field

The invention relates to the field of lighting lamps, in particular to an LED variable-frequency driving power supply.

Background

Nowadays, some LED lamps can be bright illumination of high luminance when someone, the illumination of low bright when unmanned, the variable frequency power supply of these LED lamps all include power module and with power module electric connection's frequency conversion control module, frequency conversion control module is provided with the bright control signal input of high luminance and the bright control signal input of low that can receive central processing unit control signal, frequency conversion control module can generate the PWM signal according to the received control signal who comes from central processing unit, control changes power module's output. Generally, when an LED lamp is high, both the high-brightness control signal input terminal and the low-brightness control signal input terminal receive a high-level signal; when the LED lamp is low-bright, the high-brightness control signal input end can receive a low-level signal, and the low-brightness control signal input end can receive a high-level signal.

However, the temperature of the LED lamp is high due to the long duration of the high-brightness state of the LED lamp, and the internal structure of the LED lamp is damaged, which affects the service life of the LED lamp.

Disclosure of Invention

The invention aims to solve one of the prior technical problems, and therefore the invention provides an LED variable-frequency driving power supply which can avoid the over-high temperature of an LED lamp, further avoid the light attenuation of the LED lamp and prolong the service life of the LED lamp.

The LED variable-frequency driving power supply comprises a power supply module, a variable-frequency control module and a timing protection module, the frequency conversion control module is provided with a high brightness control signal input end and a low brightness control signal input end, the frequency conversion control module is electrically connected with the power supply module, when the low-brightness control signal input end receives a high level signal, the frequency conversion control module controls the power supply module to switch between a high-brightness power supply mode and a low-brightness power supply mode according to the level of the high-brightness control signal input end receiving the level signal, the variable frequency control module can control the power supply module to drive the LED lamp to illuminate in a low bright state, the timing protection module is electrically connected with the input end of the high bright control signal, the timing protection module can shield the high level signal received by the high brightness control signal input end when the duration of the high level signal continuously received by the high brightness control signal input end exceeds a duration threshold.

The LED variable-frequency driving power supply provided by the invention at least has the following beneficial effects:

according to the LED variable-frequency driving power supply, the timing protection module can shield the high-level signal received by the high-level control signal input end when the duration of the high-level signal continuously received by the high-level control signal input end exceeds the duration threshold, the LED lamp can be brightly illuminated only when the high-level signal is received by the high-level control signal input end and the low-level signal is received by the low-level control signal input end, after the high-level signal received by the high-level control signal input end is shielded, the high-level signal is equivalent to the low-level signal received by the high-level control signal input end, the high-level signal is received by the low-level control signal input end, the LED lamp can be automatically changed from high-level illumination to low-level illumination at the moment, the illumination function is kept, the power of the LED lamp is reduced, the overhigh temperature of the LED lamp is avoided, the damage of the internal structure of the LED lamp is avoided, and the service life of the LED lamp is prolonged.

According to some embodiments of the present invention, the timing protection module includes a timing unit and a logic gate determination unit, the timing unit is electrically connected to the highlight control signal input end, and the logic gate determination unit is electrically connected to the highlight control signal input end, the timing unit and the frequency conversion control module respectively so as to shield the high level signal received by the highlight control signal input end when a duration of the high level signal continuously received by the highlight control signal input end exceeds a duration threshold.

According to some embodiments of the present invention, the timing unit includes a comparator U6, a power source VCC, a resistor R53, a resistor R54, a resistor R55, and a capacitor C16, the logic gate determination unit includes an and circuit, one end of the resistor R53 is electrically connected to the highlight control signal input terminal, the other end of the resistor R53 is electrically connected to one end of the capacitor C16 and the negative input terminal of the comparator U6, the other end of the capacitor C16 is electrically connected to the common ground, one end of the resistor R55 is electrically connected to the positive input terminal of the comparator U6 and one end of the resistor R54, the other end of the resistor R55 is electrically connected to the common ground, the other end of the resistor R54 is electrically connected to the power source VCC, a first input terminal of the and circuit U7 is electrically connected to the output terminal of the comparator U6, a second input terminal of the and circuit U7 is electrically connected to the highlight control signal input terminal, and the output end of the AND gate circuit U7 is electrically connected with the variable frequency control module.

According to some embodiments of the present invention, the combinational logic circuit unit further includes a diode D10, an anode of the diode D10 is electrically connected to the end of the resistor R53 away from the highlight control signal input terminal, and a cathode of the diode D10 is electrically connected to the end of the resistor R53 close to the highlight control signal input terminal.

According to some embodiments of the present invention, the power module includes a rectifying and filtering unit, a power factor correction unit and a voltage regulation unit, the rectifying and filtering unit is electrically connected to a commercial power and the power factor correction unit, the power factor correction unit is electrically connected to the voltage regulation unit and the frequency conversion control module respectively to save electric energy, and the frequency conversion control module is electrically connected to the voltage regulation unit to control and change the output power of the voltage regulation unit according to the control signals received by the high brightness control signal input end and the low brightness control signal input end.

According to some embodiments of the present invention, the frequency conversion control module includes a PWM signal generation unit and a frequency conversion driving unit, the high brightness control signal input terminal and the low brightness control signal input terminal are both disposed on the PWM signal generation unit, the PWM signal generation unit is electrically connected to the frequency conversion driving unit, and the frequency conversion driving unit is electrically connected to the power factor correction unit and the voltage regulation unit respectively so as to change the output power of the voltage regulation unit according to the output signal of the PWM signal generation unit.

According to some embodiments of the present invention, the PWM signal generating unit includes a connection socket CN4 and a single chip microcomputer U5, the high brightness control signal input terminal and the low brightness control signal input terminal are both disposed on the connection socket CN4, a first input terminal of the single chip microcomputer U5 is electrically connected to the high brightness control signal input terminal, a second input terminal of the single chip microcomputer U5 is electrically connected to the low brightness control signal input terminal, and an output terminal of the single chip microcomputer U5 is electrically connected to the variable frequency driving unit.

According to some embodiments of the present invention, the variable frequency driving unit includes a dimming control chip U2, a photo coupler U3 and a switching tube Q2, an output terminal of the single chip microcomputer U5 is electrically connected to an input terminal of a light emitter of the photo coupler U3, an output terminal of a light receiver of the photo coupler U3 is electrically connected to a PWM signal receiving terminal of the dimming control chip, an output terminal of the dimming control chip U2 is electrically connected to a controlled terminal of the switching tube Q2, an input terminal of the switching tube Q2 is electrically connected to a common ground, and an output terminal of the switching tube Q2 is electrically connected to the voltage regulating unit.

According to some embodiments of the present invention, the rectifier filter unit includes a fuse F1, an inductor L1, an inductor L2, and a rectifier bridge BR1, one end of the fuse F1 is electrically connected to the live line, the other end of the fuse F1 is electrically connected to one end of the inductor L1, the other end of the inductor L1 is electrically connected to a first ac input terminal of the rectifier bridge BR1, one end of the inductor L2 is electrically connected to the neutral line, the other end of the inductor L2 is electrically connected to a second ac input terminal of the rectifier bridge BR1, and output terminals of the rectifier bridge BR1 are electrically connected to the power factor correction unit and the voltage regulation unit, respectively.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram of an LED variable frequency drive power supply according to the present invention;

FIG. 2 is a schematic circuit diagram of a PWM signal generation unit and a timing protection module according to some embodiments of the present invention;

FIG. 3 is a schematic circuit diagram of the LED variable frequency driving power supply of the present invention.

Reference numerals:

the power supply module 100, the rectifying and filtering unit 110, the power factor correction unit 120, the voltage regulation unit 130, the frequency conversion control module 200, the PWM signal generation unit 210, the frequency conversion driving unit 220, the timing protection module 300, the timing unit 310, and the logic gate judgment unit 320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that directional descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., refer to the directional or positional relationships illustrated in the drawings, and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

A frequency conversion control module according to the present invention, as shown in fig. 1-3, comprises a power module 100, a frequency conversion control module 200, and a timing protection module 300, wherein the frequency conversion control module 200 is provided with a high brightness control signal input terminal and a low brightness control signal input terminal, the frequency conversion control module 200 is electrically connected to the power module 100, when the low-brightness control signal input end receives a high level signal, the frequency conversion control module 200 controls the power module 100 to switch between a high-brightness power supply mode and a low-brightness power supply mode according to the high-brightness control signal input end receiving the level signal, the frequency conversion control module 200 can control the power module 100 to drive the LED lamp to illuminate in a low-brightness mode, the timing protection module 300 is electrically connected with the high-brightness control signal input end, and the timing protection module 300 can shield the high level signal received by the high-brightness control signal input end when the duration of continuously receiving the high level signal at the high-brightness control signal input end exceeds the duration threshold.

The timing protection module 300 of the LED variable frequency driving power supply can shield the high level signal received by the high brightness control signal input end when the duration of the high level signal continuously received by the high brightness control signal input end exceeds the duration threshold, since the frequency conversion control module 200 will control the power module 100 to make the LED lamp illuminate high only when the high-level signal is received at both the high-level control signal input terminal and the low-level control signal input terminal, after the high level signal received by the high brightness control signal input end is shielded, the high brightness control signal input end receives a low level signal and the low brightness control signal input end receives a high level signal, at the moment, the LED lamp can automatically change from high brightness illumination to low brightness illumination to keep providing an illumination function, meanwhile, the power of the LED lamp is reduced, the overhigh temperature of the LED lamp is avoided, the damage of the internal structure of the LED lamp is avoided, and the service life of the LED lamp is prolonged.

In some embodiments of the present invention, as shown in fig. 2, the timing protection module 300 includes a timing unit 310 and a logic gate determination unit 320, the timing unit 310 is electrically connected to the highlight control signal input terminal, and the logic gate determination unit 320 is electrically connected to the highlight control signal input terminal, the timing unit 310 and the frequency conversion control module 200 respectively to mask the high level signal received by the highlight control signal input terminal when a duration of the high level signal continuously received by the highlight control signal input terminal exceeds a duration threshold.

Specifically, the timing unit 310 can also mask the high level signal received by the high level control signal input terminal when the duration that the high level signal is continuously received by the high level control signal input terminal exceeds the duration threshold, but the timing unit 310 may make a mistake when the low level signal is received by the high level control signal input terminal, which may result in a mistake in switching the LED lamp from the low-brightness state to the high-brightness state. The logic gate determining unit 320 can perform logic operation on the output signal of the timing unit 310 and the signal received by the highlight control signal input terminal, so as to avoid errors and ensure that the LED lamp can be protected.

In some embodiments of the present invention, as shown in fig. 2, the timing unit includes a comparator U6, a power source VCC, a resistor R53, a resistor R54, a resistor R55, and a capacitor C16, the logic gate determination unit includes an and circuit U7, one end of a resistor R53 is electrically connected to the highlight control signal input terminal, the other end of the resistor R53 is electrically connected to one end of the capacitor C16 and the negative input terminal of the comparator U6, the other end of the capacitor C16 is electrically connected to the common ground, one end of a resistor R55 is electrically connected to the positive input terminal of the comparator U6 and one end of a resistor R54, the other end of the resistor R55 is electrically connected to the common ground, the other end of the resistor R54 is electrically connected to the power source VCC, a first input terminal of the and circuit U7 is electrically connected to the output terminal of the comparator U6, a second input terminal of the and circuit U7 is electrically connected to the highlight control signal input terminal, an output terminal of the and circuit U7 is electrically connected to the frequency conversion control module 200, it should be noted that, in this embodiment, after the high level signal received by the highlight control signal input terminal is shielded for a period of time, the temperature of the LED lamp drops to within a reasonable range, and if the high level signal received by the highlight control signal input terminal is to be canceled from being shielded, the low level signal needs to be input to the highlight control signal input terminal first, and then the high level signal needs to be input to the highlight control signal input terminal again, and then the LED lamp can be highlighted again for illumination, but when the duration of the re-highlighted illumination of the LED lamp exceeds the duration threshold, the high level signal received by the highlight control signal input terminal is shielded again.

Specifically, the resistor R54 and the resistor R55 are voltage dividing resistors, the voltage of the power source VCC is applied to the resistor R54 and the resistor R55 according to the resistance ratio of the resistor R54 and the resistor R55, the voltage across the resistor R55 is the voltage at the positive input end of the comparator U6, and the voltage across the capacitor C16 is the voltage at the negative input end of the comparator U6.

When the high-brightness control signal input end receives a low-level signal, the capacitor C16 is not charged, the voltage of the positive electrode input end of the comparator U6 is higher than the voltage of the negative electrode input end of the comparator U6, the comparator U6 outputs a high-level signal, the AND gate circuit U7 outputs a low-level signal, and the LED lamp can be used for normally low-brightness illumination or not bright; when the high-level signal is received by the high-brightness control signal input end and the duration of continuously receiving the high-level signal is within the duration threshold, the capacitor C16 is charged, the voltage at two ends of the capacitor C16 slowly rises, the voltage at the positive input end of the comparator U6 is still higher than the voltage at the negative input end of the comparator U6, the comparator U6 outputs the high-level signal, the AND gate circuit U7 outputs the high-level signal, and the LED can normally perform high-brightness illumination; when the high-level signal is received at the high-brightness control signal input end and the duration of continuously receiving the high-level signal exceeds the duration threshold, because the capacitor C16 is always charged, the voltage at the positive input end of the comparator U6 is lower than the voltage at the negative input end of the comparator U6, the comparator U6 outputs a low-level signal, and the and circuit U7 outputs a low-level signal, so that the LED lamp is changed from high-brightness to low-brightness and is kept low-brightness.

In addition, the time length threshold of the time length that the high-brightness signal input end can continuously receive the high-level signal can be adjusted by changing the resistance sizes of the resistor R54 and the resistor R55, and also can be adjusted by changing the resistance size of the resistor R53 and the capacitance size of the capacitor C16. Furthermore, the timing unit 310 may also use a delay relay or the like to implement the timing function. The logic gate judgment unit 320 may also use an exclusive or gate to make the logic judgment.

In some embodiments of the present invention, as shown in fig. 2, the combinational logic circuit unit further includes a diode D10, an anode of the diode D10 is electrically connected to a terminal of the resistor R53 away from the highlight control signal input terminal, and a cathode of the diode D10 is electrically connected to a terminal of the resistor R53 close to the highlight control signal input terminal.

Specifically, because the diode has the characteristic of unidirectional conduction, the diode D10 is only conducted when the capacitor C16 discharges, and the diode D10 is conducted to accelerate the discharge rate of the capacitor C16.

In some embodiments of the present invention, as shown in fig. 1 and 3, the power module 100 includes a rectifying and filtering unit 110, a power factor correction unit 120 and a voltage regulation unit 130, the rectifying and filtering unit 110 is electrically connected to the commercial power and the power factor correction unit 120, the power factor correction unit 120 is electrically connected to the voltage regulation unit 130 and the frequency conversion control module 200 respectively to save electric energy, and the frequency conversion control module 200 is electrically connected to the voltage regulation unit 130 to control and change the output power of the voltage regulation unit 130 according to the control signals received by the high brightness control signal input terminal and the low brightness control signal input terminal.

Specifically, the power factor refers to a relationship between the effective power and the total power consumption amount (apparent power), that is, a ratio of the effective power divided by the total power consumption amount (apparent power). The higher the power factor of the circuit is, the smaller the electric energy loss ratio is, and the electric energy utilization rate is high. In some embodiments of the present invention, the power factor correction unit 120 includes a power factor correction chip U1 and a chopper circuit, a power input terminal of the power factor correction chip U1 and an input terminal of the chopper circuit are electrically connected to the rectifying and filtering unit 110, a signal output terminal of the power factor correction chip U1 is electrically connected to a controlled terminal of the chopper circuit, and an output terminal of the chopper circuit is electrically connected to the variable frequency control module 200 and the voltage regulating unit 130, respectively. The frequency conversion control module 200 can change the output voltage or the output current of the voltage regulating unit 130, and further change the output power, so that the brightness of the LED lamp is correspondingly changed.

In some embodiments of the present invention, as shown in fig. 1-3, the frequency conversion control module 200 includes a PWM signal generating unit 210 and a frequency conversion driving unit 220, wherein a high brightness control signal input terminal and a low brightness control signal input terminal are both disposed on the PWM signal generating unit 210, the PWM signal generating unit 210 is electrically connected to the frequency conversion driving unit 220, and the frequency conversion driving unit 220 is electrically connected to the power factor correction unit 120 and the voltage regulating unit 130 respectively to change the output power of the voltage regulating unit 130 according to the output signal of the PWM signal generating unit 210.

Specifically, when the high-brightness control signal input terminal and the low-brightness control signal input terminal both receive a high level signal, the PWM signal generating unit 210 generates a PWM signal with a high duty ratio; when the high brightness control signal input terminal receives a low level signal and the low brightness control signal input terminal receives a high level signal, the PWM signal generating unit 210 generates a PWM signal with a low duty ratio. PWM signal generation section 210 also transmits the generated PWM signal to inverter drive section 220, and inverter drive section 220 adjusts the output of voltage regulation section 130 using the PWM signal.

In some embodiments of the present invention, as shown in fig. 2, the PWM signal generating unit 210 includes a connection socket CN4 and a single chip microcomputer U5, wherein a highlight control signal input terminal and a low-brightness control signal input terminal are both disposed on the connection socket CN4, a first input terminal of the single chip microcomputer U5 is electrically connected to the highlight control signal input terminal, a second input terminal of the single chip microcomputer U5 is electrically connected to the low-brightness control signal input terminal, and an output terminal of the single chip microcomputer U5 is electrically connected to the frequency conversion driving unit 220.

Specifically, the single chip microcomputer U5 can generate a PWM signal according to signals input from the first input terminal and the second input terminal. In some embodiments, the model of the single chip microcomputer U5 is 12F1822, VSS of the single chip microcomputer U5 is connected to a common ground, VDD of the single chip microcomputer U5 is connected to a power VCC, RA0 of the single chip microcomputer U5 is connected to the power VCC through a resistor R49, RA1 of the single chip microcomputer U5 is connected to the power VCC through a resistor R50, RA2/PWM of the single chip microcomputer U5 is an output terminal, RA5 of the single chip microcomputer U5 is divided into two paths, one path is connected to the common ground through a resistor R51, the other path is connected to a high-brightness control signal input terminal, RA4 of the single chip microcomputer U5 is divided into two paths, one path is connected to the common ground through a resistor R52, the other path is connected to a low-brightness control signal input terminal, RA3 of the single chip microcomputer U5 is divided into two paths, one path is connected to the power VCC through a circuit R48, and the other path is connected to the common ground through a capacitor C15. Of course, the single chip microcomputer U5 can be of other types.

In some embodiments of the present invention, as shown in fig. 3, the variable frequency driving unit 220 includes a dimming control chip U2, a photocoupler U3 and a switching tube Q2, an output terminal of the single chip U5 is electrically connected to an input terminal of a light emitter of the photocoupler U3, an output terminal of a light receiver of the photocoupler U3 is electrically connected to a PWM signal receiving terminal of the dimming control chip, an output terminal of the dimming control chip U2 is electrically connected to a controlled terminal of the switching tube Q2, an input terminal of the switching tube Q2 is electrically connected to a common ground, and an output terminal of the switching tube Q2 is electrically connected to the voltage regulating unit 130.

Specifically, the photocoupler U3 can play an isolation role, and prevent the PWM signal received by the dimming control chip U2 from being interfered. When the PWM signal is at a high level, the switching tube Q2 may be turned on by a signal output from the output terminal of the dimming control chip U2, and when the PWM signal is at a low level, the switching tube Q2 may be turned off by a signal output from the output terminal of the dimming control chip U2, so that the PWM signal generating unit 210 generates different duty ratios of the PWM signals, and the switching tube Q2 is turned on for different periods of time, which finally results in different luminances of the LED lamp. In certain embodiments, the dimming control chip U2 is model BP 3179. The switching tube Q2 may be a triode or a MOS tube.

In some embodiments of the present invention, as shown in fig. 3, the rectifier filter unit 110 includes a fuse F1, an inductor L1, an inductor L2, and a rectifier bridge BR1, one end of the fuse F1 is electrically connected to the live line, the other end of the fuse F1 is electrically connected to one end of the inductor L1, the other end of the inductor L1 is electrically connected to a first ac input terminal of the rectifier bridge BR1, one end of the inductor L2 is electrically connected to the neutral line, the other end of the inductor L2 is electrically connected to a second ac input terminal of the rectifier bridge BR1, and an output terminal of the rectifier bridge BR1 is electrically connected to the power factor correction unit 120 and the voltage regulation unit 130, respectively.

Specifically, the fuse F1 can blow when the circuit is overloaded, causing the circuit to become open, protecting the entire circuit. The inductor L1 and the inductor L2 can reduce radiation and reduce high-frequency common mode noise. Rectifier bridge BR1 is capable of converting alternating current to direct current.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.