LED lamp voltage stabilization method and circuit capable of automatically adapting to input voltage fluctuations

Abstract

The present invention relates to a voltage stabilization method and circuit for LED lamps that can automatically adapt to input voltage fluctuations; the method is based on a circuit composed of a field effect tube or a triode and an LED lamp; an adaptive voltage stabilization module electrically connected to the gate of the field effect tube or the base of the triode is provided, and the adaptive voltage stabilization module is also electrically connected to the input power supply; the adaptive voltage stabilization module has two different current channels for charging and discharging; when the voltage difference when the input power supply fluctuates causes the adaptive voltage stabilization module to discharge, the adaptive voltage stabilization module can discharge quickly through the discharge channel, and the absolute value of the voltage of the adaptive voltage stabilization module decreases rapidly; when the voltage difference when the input power supply fluctuates causes the input power supply to charge the adaptive voltage stabilization module, the adaptive voltage stabilization module can charge through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilization module increases. The voltage stabilization method and circuit for LED lamps of the present invention have the advantages of simple circuit structure, low cost, stable dimming, safety and reliability, etc.

Description

[Technical field]

[0002] The present invention relates to a circuit device for general electric light sources, in particular to a power supply circuit for LEDs and a control device thereof, and in particular to a voltage stabilization method and circuit for LED lamps that can automatically adapt to input voltage fluctuations. The LED of the present invention is the abbreviation of Light Emitting Diode in English, which means "light emitting diode" in Chinese. [Background technology]

[0004] In recent years, LED has been used more and more widely as an energy-saving and environmentally friendly product, for example, in general lighting, signs and signals, and backlight sources for display panels and TV screens, etc. LED drive circuits are used to provide power to LEDs. The existing LED drive circuits are generally high-power factor drive circuits, and many of them will have a stroboscopic phenomenon; one of the reasons for the stroboscopic phenomenon is that the fluctuation of the doubled frequency voltage generated after the alternating current is rectified affects the voltage output to the LED lamp, so that the current output of the LED lamp also fluctuates accordingly and produces a stroboscopic phenomenon; for example, the 50 Hz alternating current is rectified and doubled to 100 Hz, and the stroboscopic phenomenon it produces is a 100 Hz stroboscopic phenomenon. Although the naked eye cannot directly feel the stroboscopic phenomenon of a 100 Hz LED lamp, long-term exposure to the light of a stroboscopic LED lamp will affect vision and personal health.

[0005] See also Figure 1A ,Should Figure 1A The constant current source in the LED lamp is generated by the LED lamp driving circuit. The ideal constant current source is as follows Figure 1F As shown, it is a straight line without fluctuations; but in fact, in many AC LED lamp drive circuits, especially high power factor LED lamp drive circuits, the actual output current waveform is as follows Figure 1E As shown in the figure, the average current is a constant current, but it contains a lot of AC components. It is these AC components that cause the so-called LED light flicker. The voltage VAC dropped on the LED light by the constant current source containing AC components is a fluctuating voltage, such as Figure 1D As shown, its voltage waveform is a fluctuating sine wave. Figure 1A The circuit in does not have any voltage stabilization circuit. Figure 1A It is assumed that the constant current source is connected to 50 Hz AC, and the AC component generated after rectification and frequency doubling is 100 Hz. The LED lamp current frequency is 100 Hz, and the fluctuation period is 10 milliseconds.

[0006] To filter out the AC component and remove the flicker, it is necessary to add a voltage-stabilizing constant current circuit. Figure 1B ,Should Figure 1BA known LED voltage-stabilizing constant-current circuit includes a resistor R100, a resistor R200, a voltage-stabilizing diode D100, a field-effect transistor Q100 and an LED lamp. The resistor R100 and the voltage-stabilizing diode D100 are connected in series and electrically connected between the positive electrode and the negative electrode of the input power supply, wherein the anode of the voltage-stabilizing diode D100 is connected to the negative electrode of the input power supply, the resistor R100 is electrically connected to the positive electrode of the input power supply, and the gate G of the field-effect transistor Q100 is electrically connected between the resistor R100 and the voltage-stabilizing diode D100. The LED lamp is electrically connected between the drain D of the field effect tube Q100 and the positive electrode of the input power supply, and a resistor R200 is connected in series between the source S of the field effect tube Q100 and the negative electrode of the input power supply; when the input voltage VAC fluctuates, the voltage regulator diode D100 stabilizes the voltage of the gate G of the N-channel field effect tube Q100, so that the maximum voltage of the source S of the field effect tube Q100 is also stable, and then the maximum current flowing through the resistor R200 is also stable, so the maximum current flowing through the LED lamp is also stable; the current flowing through the LED lamp is as follows Figure 1F shown. Figure 1B Although the LED constant current drive circuit can work well in many cases and make the LED lamp current stable, the current flowing through the LED lamp is fixed by the voltage regulator tube D100 and the resistor R200; when the current output to the LED lamp by the LED voltage regulator circuit increases, that is, when the input power of the LED lamp increases, the overall fluctuation voltage VAC increases (both the input maximum voltage and the input minimum voltage increase), and the current flowing through the LED lamp will not increase, resulting in a waste of electric energy; when the input power becomes smaller, the input fluctuation voltage decreases as a whole, the current flowing through the LED lamp decreases, and the current flowing through the resistor R200 also decreases. At this time, the LED voltage regulator circuit cannot work, and the LED lamp will still flicker; Figure 1B The LED constant current circuit is suitable for LED lamps with fixed brightness, but not suitable for LED lamps that need brightness adjustment. The LED lamp in this circuit diagram can be a single LED, or multiple LEDs connected in series, or multiple LEDs connected in series and then in parallel.

[0007] See also Figure 1C ,Should Figure 1CThis is a constant current driving circuit for dimming LED lamps that has been applied for by the applicant, comprising a voltage adjustment module 10, a field effect transistor Q110 and an LED lamp, wherein the LED lamp is electrically connected to the source S of the field effect transistor Q1, and the voltage adjustment module 10 adjusts the voltage of the source S of the field effect transistor Q110 by adjusting the voltage of the gate G of the field effect transistor Q110, thereby adjusting the current output to the LED lamp to change to achieve dimming. This constant current driving circuit can change the current of the LED lamp by changing the voltage of the voltage adjustment module 10 when the input voltage VAC is a fluctuating voltage; in order for this constant current driving circuit to adjust the current of the LED lamp, an external factor must be used to change the voltage of the voltage adjustment module 10 (such as a signal sent by a control chip), and the lowest voltage when the input voltage VAC fluctuates must be known in advance, or there must be another method for measuring the lowest voltage of the input voltage VAC, so that the voltage of the voltage adjustment module 10 is less than or equal to the sum of the lowest voltage value Vmin when the input voltage VAC fluctuates and the turn-on voltage Von of the N-type field effect transistor Q110, so that the current of the LED lamp can be stable. Figure 1C The LED lamp current must change with the current output by the front-end LED driving constant current source and maintain a constant current. The design of the control circuit is very complicated. The minimum voltage value of the input voltage VAC must be detected first, and the control circuit must send a control signal to allow the voltage adjustment module 10 to adjust to the corresponding voltage. Figure 1C The constant current drive circuit is not suitable for LED lamps whose input current often changes. [Summary of the invention]

[0009] The technical problem to be solved by the present invention is to avoid the shortcomings of the above-mentioned prior art and provide an LED lamp voltage stabilization method that can automatically adapt to input voltage fluctuations, and an LED lamp voltage stabilization circuit that can automatically adapt to input voltage fluctuations manufactured according to the method. The LED lamp voltage stabilization method and the LED lamp voltage stabilization circuit do not require an active control circuit, and can automatically adapt to changes in input power and maintain a constant voltage and current, eliminating the flicker of the LED lamp. The LED lamp is particularly suitable for the application of various dimming LED lamps, and has the advantages of simple circuit structure, low cost, stable dimming, safety and reliability, etc.

[0010] The ability of the present invention to automatically adapt to input voltage fluctuations can be further understood as being able to automatically adapt to low-frequency voltage changes and filter out high-frequency voltage fluctuations. The low frequency and high frequency here are relative, and the high frequency is at least one order of magnitude larger than the low frequency. The high frequency is generally a multiple of the alternating current and is a frequency that is imperceptible to the human eye. The low frequency is the frequency of LED lamp dimming and is perceptible to the human eye.

[0011] The technical solution adopted by the present invention to solve the technical problem is:

[0012] A voltage stabilization method for an LED lamp capable of automatically adapting to input voltage fluctuations is based on a circuit comprising a triode transistor and an LED lamp, wherein the triode transistor comprises a field effect tube or a triode; the LED lamp is electrically connected to the source of the field effect tube or the emitter of the triode; the method comprises the following steps:

[0013] An adaptive voltage stabilizing module is provided, wherein the adaptive voltage stabilizing module is electrically connected to the gate of the field effect tube or the base of the triode, and the adaptive voltage stabilizing module is also electrically connected to an input power supply;

[0014] The adaptive voltage stabilization module has two different current channels, charging and discharging;

[0015] When the voltage difference during input power fluctuation causes the adaptive voltage stabilization module to discharge, the adaptive voltage stabilization module can discharge rapidly through the discharge channel, and the absolute value of the voltage of the adaptive voltage stabilization module decreases rapidly.

[0016] When the voltage difference when the input power source fluctuates causes the input power source to charge the adaptive voltage stabilizing module, the adaptive voltage stabilizing module can be charged through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module increases.

[0017] When the input power supply charges the adaptive voltage stabilizing module, when the voltage difference is less than the threshold voltage of the adaptive voltage stabilizing module, the adaptive voltage stabilizing module can be charged slowly through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module increases slowly; when the voltage difference is greater than the threshold voltage of the adaptive voltage stabilizing module, the adaptive voltage stabilizing module can be charged quickly through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module increases quickly.

[0018] The adaptive voltage stabilizing module includes a voltage regulator tube, and the anode to cathode of the voltage regulator tube is a fast discharge channel of the adaptive voltage stabilizing module, and the reverse breakdown voltage of the voltage regulator tube is the gate voltage of the charging channel of the adaptive voltage stabilizing module. When the triode transistor is an N-channel field effect tube, the two ends of the voltage regulator tube are electrically connected between the positive electrode of the input power supply and the gate of the field effect tube, wherein the anode of the voltage regulator tube is electrically connected to the gate of the field effect tube; when the triode transistor is a P-channel field effect tube, the two ends of the voltage regulator tube are electrically connected between the negative electrode of the input power supply and the gate of the field effect tube, wherein the cathode of the voltage regulator tube is electrically connected to the gate of the field effect tube; when the triode transistor is an NPN-type triode, the base of the triode is electrically connected to the anode of the voltage regulator tube through a resistor, and the cathode of the voltage regulator tube is electrically connected to the positive electrode of the input power supply; when the triode transistor is a PNP-type triode, the base of the triode is electrically connected to the cathode of the voltage regulator tube through a resistor, and the anode of the voltage regulator tube is electrically connected to the negative electrode of the input power supply.

[0019] The adaptive voltage stabilization module also includes a resistor and a capacitor. The resistor and the voltage regulator are connected in parallel. The capacitor and the voltage regulator are connected in series and electrically connected to both ends of the input power supply. The series connection is electrically connected to the gate of the field effect tube or the base of the transistor.

[0020] The voltage regulator tube can be replaced by an adjustable voltage regulator tube or a diode.

[0021] The adaptive voltage stabilization module includes a voltage stabilization tube and a resistor, and the reverse breakdown channel from the cathode to the anode of the voltage stabilization tube is a fast discharge channel, and the input power slowly charges the adaptive voltage stabilization module through the resistor. When the triode transistor is an N-channel field effect tube, the resistor is electrically connected between the positive electrode of the input power supply and the gate of the field effect tube, and the voltage stabilization tube is electrically connected between the source of the field effect tube and the gate of the field effect tube, wherein the anode of the voltage stabilization tube is electrically connected to the source of the field effect tube; when the triode transistor is a P-channel field effect tube, the resistor is electrically connected between the negative electrode of the input power supply and the gate of the field effect tube, and the voltage stabilization tube is electrically connected between the source of the field effect tube and the gate of the field effect tube, wherein the cathode of the voltage stabilization tube is electrically connected to the source of the field effect tube. The adaptive voltage stabilization module also includes a capacitor; when the triode transistor is an N-channel field effect tube, the capacitor is electrically connected between the gate of the field effect tube and the negative electrode of the input power supply; when the triode transistor is a P-channel field effect tube, the capacitor is electrically connected between the gate of the field effect tube and the positive electrode of the input power supply.

[0022] The present invention can also be further implemented by the following technical solutions:

[0023] A voltage stabilizing circuit for an LED lamp capable of automatically adapting to input voltage fluctuations comprises a triode transistor and an LED lamp, wherein the triode transistor comprises a field effect tube or a triode, and the LED lamp is electrically connected to the source of the field effect tube or the emitter of the triode; the voltage stabilizing circuit for an LED lamp capable of automatically adapting to input voltage fluctuations also comprises an adaptive voltage stabilizing module having two different current channels, charging and discharging, wherein the adaptive voltage stabilizing module is electrically connected to the gate of the field effect tube or the base of the triode, and the adaptive voltage stabilizing module is also electrically connected to an input power supply; when the voltage difference during input power fluctuations causes the adaptive voltage stabilizing module to discharge, the adaptive voltage stabilizing module can discharge rapidly through the discharge channel, and at this time the absolute value of the voltage of the adaptive voltage stabilizing module decreases rapidly; when the voltage difference during input power fluctuations causes the input power to charge the adaptive voltage stabilizing module, the adaptive voltage stabilizing module can charge through the charging channel, and at this time the absolute value of the voltage of the adaptive voltage stabilizing module increases.

[0024] Compared with the prior art, the LED lamp voltage stabilization method and circuit of the present invention which can automatically adapt to the input voltage fluctuation has the following beneficial effects:

[0025] The LED lamp voltage stabilization method and circuit of the present invention can automatically adapt to low-frequency voltage changes and filter out high-frequency voltage fluctuations. It does not require an active control circuit and is suitable for various dimming LED lamps connected to alternating current. It allows the current of the LED lamp to change accordingly with changes in input power, and filters out high-frequency fluctuations to maintain a constant voltage and current, eliminating the flicker of the LED lamp. It has the advantages of simple circuit structure, low cost, stable dimming, safety and reliability, etc.

Brief Description of the Drawings

[0027] Figure 1A It is a simple circuit diagram of an LED lamp without any voltage stabilization circuit;

[0028] Figure 1B It is a concise circuit diagram of an LED constant current drive circuit in the prior art;

[0029] Figure 1C It is a concise circuit diagram of another LED constant current drive circuit in the prior art;

[0030] Figure 1D yes Figure 1A The relationship between input voltage and time is shown in the coordinate diagram, where the horizontal axis represents time in milliseconds and the vertical axis represents input voltage in volts;

[0031] Figure 1E yes Figure 1A The relationship between the current flowing through the LED lamp and time is shown in the coordinate diagram, where the horizontal axis represents time in milliseconds and the vertical axis represents the current flowing through the LED lamp in amperes;

[0032] Figure 1F yes Figure 1B The relationship between the current flowing through the LED lamp and time is shown in the coordinate diagram, where the horizontal axis represents time in milliseconds and the vertical axis represents the current flowing through the LED lamp in amperes;

[0033] Figure 2 It is a simple electrical principle block diagram of the first type of LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations of the present invention;

[0034] Figure 2B It is a simplified electrical principle block diagram of the second type of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0035] Figure 3A It is a concise circuit diagram of an embodiment of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0036] Figure 3B Is a concise circuit diagram of the second embodiment of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0037] Figure 3C Is a concise circuit diagram of the LED lamp voltage stabilizing circuit embodiment three that can automatically adapt to input voltage fluctuations;

[0038] Figure 3D Is a concise circuit diagram of the fourth embodiment of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0039] Figure 3E Is a concise circuit diagram of the fifth embodiment of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0040] Figure 3F yes Figure 3A A graph showing the relationship between input voltage and time in one embodiment, wherein the horizontal axis represents time in milliseconds and the vertical axis represents input voltage in volts;

[0041] Figure 3G yes Figure 3A A coordinate diagram showing the relationship between the gate voltage of the field effect tube (that is, the stable voltage Vm of the adaptive voltage regulator module) and time in one embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0042] Figure 3H yes Figure 3A A coordinate diagram showing the relationship between the voltage across the LED lamp and time in one embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0043] Fig. 3I yes Figure 3A A coordinate diagram showing the relationship between input voltage and time in another embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0044] Figure 3J yes Figure 3B A coordinate diagram showing the relationship between the gate voltage of the field effect tube (that is, the stable voltage Vm of the adaptive voltage regulator module) and time in another embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0045] Figure 3K yes Figure 3B Another relationship coordinate diagram of the gate voltage of the field effect tube (that is, the stable voltage Vm of the adaptive voltage regulation module) and time in another embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0046] Figure 4A Is a concise circuit diagram of the sixth embodiment of the LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations;

[0047] Figure 4B Is a concise circuit diagram of the LED lamp voltage stabilizing circuit embodiment VII that can automatically adapt to input voltage fluctuations;

[0048] Figure 4C Is a concise circuit diagram of the LED lamp voltage stabilizing circuit embodiment eight that can automatically adapt to input voltage fluctuations;

[0049] Figure 4D Is a concise circuit diagram of the LED lamp voltage stabilizing circuit embodiment nine that can automatically adapt to input voltage fluctuations;

[0050] Figure 4E is a simplified circuit diagram of Embodiment 10 of the LED lamp voltage stabilizing circuit capable of automatically adapting to input voltage fluctuations;

[0051] Figure 4F yes Figure 4A A graph showing the relationship between input voltage and time in one embodiment, wherein the horizontal axis represents time in milliseconds and the vertical axis represents input voltage in volts;

[0052] Figure 4G yes Figure 4A A coordinate diagram showing the relationship between the gate voltage of the field effect tube (that is, the stable voltage Vm of the adaptive voltage regulator module) and time in one embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0053] Figure 4H yes Figure 4A A coordinate diagram showing the relationship between the voltage across the LED lamp and time in one embodiment, wherein the abscissa represents time in milliseconds and the ordinate represents input voltage in volts;

[0054] Figure 5A Is a simple circuit diagram of the LED lamp voltage regulator circuit embodiment 11 which can automatically adapt to input voltage fluctuations;

[0055] Figure 5B This is a simplified circuit diagram of the twelfth embodiment of the LED lamp voltage stabilizing circuit capable of automatically adapting to input voltage fluctuations. [Specific implementation method]

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] See also Figure 2 and Figure 2B, A method for stabilizing a voltage of an LED lamp capable of automatically adapting to fluctuations in input voltage, based on a circuit comprising a triode transistor and an LED lamp, wherein the triode transistor comprises a field effect tube or a triode; the LED lamp is electrically connected to the source of the field effect tube or the emitter of the triode; the method comprises the following steps:

[0059] An adaptive voltage stabilizing module 100 is provided, wherein the adaptive voltage stabilizing module 100 is electrically connected to the gate of the field effect tube or the base of the triode, and the adaptive voltage stabilizing module 100 is also electrically connected to an input power supply;

[0060] The adaptive voltage stabilization module 100 has two different current channels: charging and discharging;

[0061] When the voltage difference caused by the input power fluctuation causes the adaptive voltage stabilizing module 100 to discharge, the adaptive voltage stabilizing module 100 can discharge quickly through the discharge channel, and the absolute value of the voltage of the adaptive voltage stabilizing module 100 is reduced;

[0062] When the voltage difference when the input power source fluctuates causes the input power source to charge the adaptive voltage stabilizing module 100 , the adaptive voltage stabilizing module 100 can be charged through the charging channel. At this time, the absolute value of the voltage of the adaptive voltage stabilizing module 100 increases.

[0063] See also Figure 2 and Figure 2B When the input power source charges the adaptive voltage regulator module 100, when the voltage difference is less than the threshold voltage of the adaptive voltage regulator module 100, the adaptive voltage regulator module 100 can be slowly charged through the charging channel, and the absolute value of the voltage of the adaptive voltage regulator module 100 increases slowly; when the voltage difference is greater than the threshold voltage of the adaptive voltage regulator module 100, the adaptive voltage regulator module can be quickly charged through the charging channel, and the absolute value of the voltage of the adaptive voltage regulator module increases rapidly.

[0064] The ability of the present invention to automatically adapt to input voltage fluctuations can be further understood as being able to automatically adapt to low-frequency voltage changes and filter out high-frequency voltage fluctuations. The low frequency and high frequency here are relative, and the high frequency is at least one order of magnitude larger than the low frequency. The high frequency is generally a multiple of the alternating current and is a frequency that is imperceptible to the human eye. The low frequency is the frequency of LED lamp dimming and is perceptible to the human eye.

[0065] See also Figure 2 and Figure 2BThe present invention also provides an LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations, including a triode transistor and an LED lamp, wherein the triode transistor includes a field effect tube or a triode, and the LED lamp is electrically connected to the source of the field effect tube or the emitter of the triode; the LED lamp voltage stabilizing circuit also includes an adaptive voltage stabilizing module 100 having two different current channels of charging and discharging, wherein the adaptive voltage stabilizing module 100 is electrically connected to the gate of the field effect tube or the base of the triode, and the adaptive voltage stabilizing module 100 is also electrically connected to the input power supply; when the voltage difference caused by the input power fluctuation causes the adaptive voltage stabilizing module 100 to discharge, the adaptive voltage stabilizing module 100 can discharge quickly through the discharge channel, and at this time, the absolute value of the voltage of the adaptive voltage stabilizing module 100 decreases rapidly; when the voltage difference caused by the input power fluctuation causes the input power to charge the adaptive voltage stabilizing module 100, the adaptive voltage stabilizing module 100 can charge through the charging channel, and at this time, the absolute value of the voltage of the adaptive voltage stabilizing module 100 increases.

[0066] See also Figure 3A and Figure 4A The adaptive voltage stabilizing module 100 includes a voltage stabilizing tube, the anode to cathode of the voltage stabilizing tube is a fast discharge channel of the adaptive voltage stabilizing module 100, and the reverse breakdown voltage of the voltage stabilizing tube is the gate voltage of the charging channel of the adaptive voltage stabilizing module 100.

[0067] See also Figure 3B , Figure 3D , Figure 4B and Figure 4D The adaptive voltage stabilization module 100 includes a voltage regulator tube, a resistor and a capacitor. The resistor and the voltage regulator tube are connected in parallel, and the capacitor and the voltage regulator tube are connected in series and electrically connected to both ends of the input power supply. The series connection is electrically connected to the gate of the field effect tube or the base of the transistor.

[0068] See also Figure 5A and Figure 5B The adaptive voltage stabilizing module 100 includes a voltage stabilizing tube and a resistor. The reverse breakdown channel from the cathode to the anode of the voltage stabilizing tube is a fast discharge channel. The input power slowly charges the adaptive voltage stabilizing module 100 through the resistor.

[0069] See also Figure 3C and Figure 4C , the voltage regulator tube can be replaced by an adjustable voltage regulator tube.

[0070] See also Figure 3E and Figure 4E , the voltage regulator tube can be replaced by a diode.

[0071] See also Figure 2, the triode transistor is an N-type triode transistor, including an N-channel field effect transistor or an NPN-type triode; the LED lamp is electrically connected between the third pole of the N-type triode transistor and the negative pole of the input power supply, that is, the positive pole of the LED lamp is electrically connected to the source of the N-channel field effect transistor or the emitter of the NPN-type triode, and the negative pole of the LED lamp is electrically connected to the negative pole of the input power supply; the adaptive voltage stabilizing module 100 is electrically connected between the first pole of the N-type triode transistor and the positive pole of the input power supply, that is, the adaptive voltage stabilizing module 100 is electrically connected to the gate of the N-channel field effect transistor or the base of the NPN-type triode, and the adaptive voltage stabilizing module 100 is also electrically connected to the positive pole of the input power supply; the second pole of the N-type triode is electrically connected to the positive pole of the input power supply, that is, the drain of the N-channel field effect transistor or the collector of the NPN-type triode is electrically connected to the positive pole of the input power supply.

[0072] See also Figure 2 , taking the negative pole of the input power supply as the reference voltage 0 volts, the positive pole of the input power supply as the input voltage VAC, the stable voltage of the adaptive voltage regulator module 100 is Vm, the minimum voltage value when the input voltage fluctuates is Vmin, and the turn-on voltage of the N-type triode transistor is Von. When the stable voltage Vm of the adaptive voltage regulator module 100 is less than or equal to the sum of the minimum voltage value Vmin when the input voltage fluctuates and the turn-on voltage Von of the N-type triode transistor, that is, Vm≤(Vmin+Von), the voltage on the LED lamp is stable, and the current flowing through the LED lamp is also stable.

[0073] See also Figure 2 , two different current channels, charging and discharging, are formed between the adaptive voltage stabilization module 100 and the input power supply:

[0074] When the voltage of the input power source fluctuates and is lower than the stable voltage of the adaptive voltage stabilizing module 100, the adaptive voltage stabilizing module 100 can discharge quickly through the discharge channel. At this time, the stable voltage of the adaptive voltage stabilizing module 100 decreases rapidly as the voltage of the input power source fluctuates;

[0075] When the voltage of the input power source during fluctuation is equal to the stable voltage of the adaptive voltage stabilizing module 100 , the stable voltage of the adaptive voltage stabilizing module 100 remains unchanged.

[0076] When the voltage of the input power source fluctuates and is higher than the stable voltage of the adaptive voltage stabilizing module 100, the adaptive voltage stabilizing module 100 can be charged through the charging channel. At this time, the stable voltage of the adaptive voltage stabilizing module 100 increases with the increase of the voltage of the input power source fluctuates; wherein, the higher voltage Vg=input voltage VAC-stable voltage Vm, when the higher voltage Vg is less than the set threshold voltage (the threshold voltage is determined by the components and circuits constituting the adaptive voltage stabilizing module 100, such as Figure 3B The reverse breakdown voltage of the medium voltage regulator D1 is the gate voltage of the circuit. Figure 3C The resistance values ​​of the middle resistors R11 and R12 and the reference voltage of the adjustable voltage regulator D11 together determine the threshold voltage of the circuit), the adaptive voltage regulator module 100 can be charged slowly through the charging channel. At this time, the stable voltage Vm of the adaptive voltage regulator module 100 slowly increases with the voltage increase when the input voltage VAC fluctuates; when the higher voltage Vg is greater than the set threshold voltage, the adaptive voltage regulator module 100 can be charged quickly through the charging channel. At this time, the stable voltage Vm of the adaptive voltage regulator module 100 quickly increases with the voltage increase when the input power source fluctuates.

[0077] The stable voltage of the adaptive voltage stabilizing module 100 can change with the minimum voltage value when the input power source fluctuates, and when the stable voltage Vm of the adaptive voltage stabilizing module 100 is kept less than or equal to the sum of the minimum voltage value Vmin when the input power source fluctuates and the turn-on voltage Von of the N-type triode transistor, that is, Vm≤(Vmin+Von), the current flowing through the LED lamp can change accordingly with the change of the input power and remain stable, so that the LED lamp has no flicker.

[0078] See also Figure 2B , the triode transistor is a P-type triode transistor, including a P-channel field effect transistor or a PNP-type triode; the LED lamp is electrically connected between the third pole of the P-type triode transistor and the positive pole of the input power supply, that is, the negative pole of the LED lamp is electrically connected to the source of the P-channel field effect transistor or the emitter of the PNP-type triode, and the positive pole of the LED lamp is electrically connected to the positive pole of the input power supply; the adaptive voltage stabilizing module 100 is electrically connected between the first pole of the P-type triode transistor and the negative pole of the input power supply, that is, the adaptive voltage stabilizing module 100 is electrically connected to the gate of the P-channel field effect transistor or the base of the PNP-type triode, and the adaptive voltage stabilizing module 100 is also electrically connected to the negative pole of the input power supply; the second pole of the P-type triode transistor is electrically connected to the negative pole of the input power supply, that is, the drain of the P-channel field effect transistor or the collector of the PNP-type triode is electrically connected to the negative pole of the input power supply.

[0079] See also Figure 2B, taking the positive pole of the input power supply as the reference voltage 0 volts, the negative pole of the input power supply as the input voltage -VAC, the stable voltage of the adaptive voltage regulator module 100 is -Vm, the maximum voltage value when the input power supply fluctuates is -Vmax, and the turn-on voltage of the P-type triode transistor is -Von. When the stable voltage -Vm of the adaptive voltage regulator module 100 is greater than or equal to the sum of the maximum voltage -Vmax when the input power supply fluctuates and the turn-on voltage -Von of the P-type triode transistor, that is, -Vm≥[(-Vmax)+(-Von)]; that is, when the absolute value of the stable voltage |-Vm| of the adaptive voltage regulator module 100 is less than or equal to the sum of the minimum absolute value of the voltage |-Vmax| when the input power supply fluctuates and the absolute value of the turn-on voltage |-Von| of the P-type triode transistor, that is, when |-Vm|≤|-Vmax|+|-Von|, the voltage on the LED lamp is stable, and the current flowing through the LED lamp is also stable.

[0080] See also Figure 2B , two different current channels, charging and discharging, are formed between the adaptive voltage stabilization module 100 and the input power supply:

[0081] When the voltage of the input power fluctuation is higher than the stable voltage -Vm of the adaptive voltage stabilizing module 100, the adaptive voltage stabilizing module 100 can discharge quickly through the discharge channel. At this time, the stable voltage -Vm of the adaptive voltage stabilizing module 100 increases rapidly with the increase of the voltage of the input power fluctuation, that is, the absolute value of the stable voltage |-Vm| of the adaptive voltage stabilizing module 100 decreases.

[0082] When the voltage of the input power source during fluctuation is equal to the stable voltage of the adaptive voltage stabilizing module 100 , the stable voltage of the adaptive voltage stabilizing module 100 remains unchanged.

[0083] When the voltage of the input power supply fluctuates and is lower than the stable voltage -Vm of the adaptive voltage stabilizing module 100, the adaptive voltage stabilizing module 100 can be charged through the charging channel. At this time, the stable voltage -Vm of the adaptive voltage stabilizing module 100 decreases as the voltage of the input power supply fluctuates, that is, the absolute value of the stable voltage |-Vm| of the adaptive voltage stabilizing module 100 increases; wherein, the low voltage Ve = stable voltage - input voltage = (-Vm) - (-VAC), when the low voltage Ve is less than the set threshold voltage (the threshold voltage is determined by the components and circuits constituting the adaptive voltage stabilizing module 100, such as Figure 4B The reverse breakdown voltage of the medium voltage regulator D2 is the gate voltage of the circuit. Figure 4CThe resistance values ​​of the middle resistors R21 and R22 and the reference voltage of the adjustable voltage regulator D21 together determine the threshold voltage of the circuit), the adaptive voltage regulator module 100 can be charged slowly through the charging channel. At this time, the stable voltage -Vm of the adaptive voltage regulator module 100 slowly decreases as the voltage decreases when the input power fluctuates, that is, the absolute value of the stable voltage |-Vm| of the adaptive voltage regulator module 100 slowly increases; when the output voltage Ve is greater than the set threshold value, the adaptive voltage regulator module 100 can be charged quickly through the charging channel. At this time, the stable voltage -Vm of the adaptive voltage regulator module 100 quickly decreases as the voltage decreases when the input power fluctuates, that is, the absolute value of the stable voltage |-Vm| of the adaptive voltage regulator module 100 quickly increases.

[0084] The stable voltage -Vm of the adaptive voltage stabilizing module 100 can change with the maximum voltage -Vmax when the input power fluctuates, and the stable voltage -Vm of the adaptive voltage stabilizing module 100 is kept greater than or equal to the sum of the maximum voltage -Vmax when the input power fluctuates and the turn-on voltage -Von of the P-type triode transistor, that is, -Vm≥[(-Vmax)+(-Von)], that is, when the absolute value of the stable voltage |-Vm| of the adaptive voltage stabilizing module 100 is less than or equal to the sum of the minimum absolute value of the voltage |-Vmax| when the input power fluctuates and the absolute value of the turn-on voltage |-Von| of the P-type triode transistor, that is, when |-Vm|≤|-Vmax|+|-Von|, the current flowing through the LED lamp can change accordingly with the change of the input power and remain stable, so that the LED lamp does not flicker.

[0085] The LED lamp in the present invention can be a single LED, or multiple LEDs connected in series, or multiple LEDs connected in series and then connected in parallel. In each figure, only one LED is drawn for illustration.

[0086] Example 1, see Figure 3A , the first embodiment is Figure 2 The present invention is a practical application specific circuit, which can automatically adapt to the input voltage fluctuation change of the LED lamp voltage stabilization circuit, including an N-channel field effect tube QN, an LED lamp and a voltage stabilization tube D1, wherein the triode transistor is an N-channel field effect tube QN, and the adaptive voltage stabilization module 100 is the voltage stabilization tube D1; the positive electrode of the LED lamp is electrically connected to the source electrode S of the field effect tube QN, the drain electrode D of the field effect tube QN is electrically connected to the positive electrode of the input power supply, and the negative electrode of the LED lamp is electrically connected to the negative electrode of the input power supply; the two ends of the voltage stabilization tube D1 are electrically connected between the positive electrode of the input power supply and the gate electrode G of the field effect tube QN, wherein the anode of the voltage stabilization tube D1 is electrically connected to the gate electrode G of the field effect tube QN.

[0087] See also Figure 3A, the negative pole of the input power supply is the reference voltage 0 volts, the positive pole of the input power supply is the input voltage VAC, the stable voltage of the adaptive voltage regulator module 100 is Vm (i.e., the anode voltage of the voltage regulator D1), the minimum voltage value when the input power supply fluctuates is Vmin, and the turn-on voltage of the field effect tube QN is Von. Assuming that the maximum value Vmax of the voltage VAC of the input power supply is 110 volts and the minimum value Vmin is 100 volts, its waveform is as follows Figure 3F As shown; the voltage regulation value of the voltage regulator D1 is greater than the difference between the highest voltage and the lowest voltage when the input power supply fluctuates, that is, greater than 10 volts, and the voltage regulation value of the voltage regulator D1 is 12V; the forward current direction from the anode of the voltage regulator D1 to the cathode of the voltage regulator D1 is Figure 2 The fast discharge channel, the reverse breakdown voltage of the voltage regulator D1 is 12V, which is the gate voltage. Figure 3A When the higher voltage Vg is less than the threshold voltage, the slow charging speed is close to zero; the detailed working process is described as follows:

[0088] See also Figure 3A ,When the gate G voltage of the field effect tube QN is 101 volts, the cathode voltage of the voltage regulator tube D1 fluctuates with the input voltage VAC. The maximum difference between the cathode voltage and the anode voltage of the voltage regulator tube D1 is 110 volts minus 101 volts, which is equal to 9 volts, which is less than the reverse breakdown voltage of the voltage regulator tube D1, 12 volts. The voltage regulator tube D1 is open circuit. At this time, the gate G voltage of the field effect tube QN (that is, the stable voltage Vm of the adaptive voltage regulator module 100) remains unchanged at 101 volts. Figure 3G As shown; at this time, the voltage across the LED lamp remains unchanged, which is the gate G voltage of the field effect tube QN minus the turn-on voltage Von of the field effect tube QN. Here, assuming that the turn-on voltage Von of the field effect tube QN is 2 volts, the voltage across the LED lamp remains unchanged at 99 volts, as shown Figure 3H shown.

[0089] See also Figure 3A When the input power increases, the voltage value of the input voltage fluctuation increases as a whole, such as the input voltage rises to a fluctuating voltage between 110 volts and 120 volts; when the difference between the cathode voltage and the anode voltage of the Zener tube D1 is greater than 12 volts, the Zener tube D1 reversely breaks down, and at this time the voltage of the gate G of the field effect tube QN rises to the maximum cathode voltage of the Zener tube D1 of 120 volts minus the reverse breakdown voltage of 12 volts. At this time, the voltage of the gate G of the field effect tube QN remains stable at 108 volts, and is not affected by the input voltage fluctuation. The current flowing through the LED lamp is stable and unchanged, and the LED lamp does not flicker.

[0090] See also Figure 3AWhen the input power decreases, the voltage value of the input voltage fluctuation decreases as a whole, such as when the input voltage drops to a fluctuating voltage between 90 volts and 100 volts; when the anode voltage of the Zener diode D1 is higher than the cathode voltage, the Zener diode D1 is forward-conducted. Assuming that the forward voltage drop of the Zener diode D1 is 1 volt, when the voltage of the gate G of the field effect transistor QN drops to 91 volts, it can no longer drop or rise, thus entering a new voltage regulation state.

[0091] From the above description, it can be seen that Figure 3A The LED lamp voltage stabilizing circuit can make the LED lamp current change accordingly with the change of input power, and when the input power is stable, the LED lamp current enters a stable constant current state.

[0092] exist Figure 3A In the LED lamp voltage stabilization circuit, in order to effectively eliminate the flicker, the voltage stabilization value of the voltage stabilization tube D1 is generally larger than the difference between the highest voltage and the lowest voltage when the input power fluctuates at the maximum input power. For example, the difference between the highest voltage and the lowest voltage when the input power fluctuates at the maximum input power is 10 volts, and the reverse breakdown voltage of the voltage stabilization tube D1 is 20 volts. When the LED lamp voltage stabilization circuit is started, Figure 3A The input power always increases from small to large, and the voltage value when the input power fluctuates also increases from small to large, and finally enters a stable fluctuation range. Assuming that the input voltage fluctuates between 111 volts and 121 volts, the voltage of the gate G of the field effect transistor QN is stable at the maximum voltage value of the input voltage VAC when it fluctuates, 121 volts minus the reverse breakdown voltage of the voltage regulator D1, 20 volts, which equals 101 volts. Fig. 3I As shown in the figure, the difference of 10V between the lowest voltage value of 111V when the input voltage VAC fluctuates and the stable voltage of 101V of the gate G of the field effect tube QN is completely wasted. The greater the reverse breakdown voltage of the voltage regulator D1, the greater the power loss caused by voltage regulation to eliminate flicker. However, if the reverse breakdown voltage of the voltage regulator D1 is less than the difference between the highest voltage value and the lowest voltage value when the input voltage VAC fluctuates, flicker cannot be effectively eliminated.

[0093] Example 2, see Figure 3B , Embodiment 2 is basically the same as Embodiment 1, except that the adaptive voltage stabilizing module 100 further includes a resistor R1 and a capacitor C1, that is, the adaptive voltage stabilizing module 100 is a voltage stabilizing tube D1, a resistor R1 and a capacitor C1; the resistor R1 is electrically connected between the positive electrode of the input power supply and the gate G of the field effect tube QN, or it can be said that the resistor R1 is connected in parallel at both ends of the voltage stabilizing tube D1, and the capacitor C1 is electrically connected between the gate G of the field effect tube QN and the negative electrode of the input power supply. The LED lamp voltage stabilizing circuit of Embodiment 2 can effectively reduce the unnecessary loss caused by the excessive reverse breakdown voltage of the voltage stabilizing tube D1, and the current is charged from the positive electrode of the input power supply through the resistor R1 to the capacitor C1. Figure 2The slow charging channel when the voltage Vg is lower than the set threshold voltage; the detailed working process is described as follows:

[0094] See also Figure 3B When the maximum voltage of the input power supply fluctuates rapidly to 121 volts, the voltage of the gate G of the field effect transistor QN also rapidly rises to 101 volts (assuming that the reverse breakdown voltage of the voltage regulator D1 is 20 volts). At this time, the voltage regulator D1 is cut off, and the current no longer flows from the voltage regulator D1 to the gate G of the field effect transistor QN. However, at this time, the current can flow to the gate G of the field effect transistor QN through the resistor R1. By setting the size of the resistor R1 and the capacitor C1, the voltage of the gate G of the field effect transistor QN can be slowly increased when the voltage regulator D1 is cut off. Figure 3J As shown, in one strobe cycle, the gate G voltage of the field effect transistor QN only rises by about 0.1 volts, and after multiple cycles the voltage rises to 112 volts (the time of each strobe cycle is the same, and for ease of representation, the strobe cycle between t3 and t130 is compressed); when the gate G voltage of the field effect transistor QN reaches the sum of the minimum voltage Vmin (111 volts) when the input voltage VAC fluctuates and the forward voltage drop (1 volt) of the voltage regulator D1, a dynamic balance is maintained, as shown in FIG. Figure 3K As shown in the figure; in a strobe cycle, as the voltage rises when the input power fluctuates, the current flows from the resistor R1 to the gate G of the field effect tube QN, causing the gate G voltage of the field effect tube QN to rise slowly; when the voltage starts to drop when the input power fluctuates, the rising speed of the gate G voltage of the field effect tube QN slows down; when the input voltage VAC fluctuates, the voltage drops to a level lower than the difference between the gate G voltage of the field effect tube QN and the forward voltage drop of the voltage regulator D1, the voltage regulator D1 is forward-conducted, and the gate G voltage of the field effect tube QN drops rapidly to 112 volts. In this way, in each voltage fluctuation cycle, the gate G voltage of the field effect tube QN keeps rising and falling, reaching a dynamic balance; at this time, the voltage fluctuation range of the gate G of the field effect tube QN is related to the resistance value of the resistor R1 and the capacity of the capacitor C1. The larger the resistance value of the resistor R1 and the larger the capacity of the capacitor C1, the smaller the voltage fluctuation range of the gate G of the field effect tube QN. When the voltage fluctuation range of the gate G of the field effect transistor QN is very small, the fluctuation range of the LED lamp current is also very small, and it can be approximately regarded as a constant current.

[0095] Example 3, see Figure 3C, The third embodiment is basically the same as the second embodiment, except that the voltage regulator D1 is replaced by an adjustable voltage regulator D11, and the resistor R1 is replaced by two resistors R11 and R12, that is, the adaptive voltage regulator module 100 includes an adjustable voltage regulator D11, a resistor R11, a resistor R12 and a capacitor C1; the two ends of the adjustable voltage regulator D11 are electrically connected between the positive electrode of the input power supply and the gate G of the field effect tube QN, wherein the anode of the adjustable voltage regulator D11 is electrically connected to the gate G of the field effect tube QN, the resistor R11 and the resistor R12 are connected in series and then connected in parallel to the two ends of the adjustable voltage regulator D11, the detection voltage end of the adjustable voltage regulator D11 is electrically connected to the electrical connection between the resistor R11 and the resistor R12, and the capacitor C1 is electrically connected between the gate G of the field effect tube QN and the negative electrode of the input power supply. The model of the adjustable voltage regulator D11 is TL431. The resistor R11 and the resistor R12 in the third embodiment are connected in series to not only set the stable voltage of the adjustable voltage regulator D11, but also play a role in Figure 3B The role of resistor R1.

[0096] Example 4, see Figure 3D , The fourth embodiment is basically the same as the second embodiment, except that the transistor T1 replaces the field effect transistor QN. Since the transistor is current-conducting, a resistor R13 is connected in series to the base of the transistor T1, that is, the base of the transistor T1 is electrically connected to the anode of the voltage regulator tube D1 through the resistor R13, and the base of the transistor T1 is also electrically connected to the capacitor C1 and the resistor R1 through the resistor R13, respectively, the positive electrode of the LED lamp is electrically connected to the emitter of the transistor T1, and the collector of the transistor T1 is electrically connected to the positive electrode of the input power supply. The transistor T1 in the fourth embodiment is an NPN transistor.

[0097] Example 5, see Figure 3E , the fifth embodiment is basically the same as the second embodiment, except that the voltage regulator D1 is replaced by a diode D12; the current path from the anode to the cathode of the diode D12 is Figure 2 The fast discharge channel of the battery, and its charging channel is the charging channel through the resistor R1. In fact, the gate voltage of its charging channel can be regarded as infinite, so there is actually no fast charging channel, only a slow charging channel through the resistor R1.

[0098] Example 6, see Figure 4A , this embodiment six is Figure 2BThe specific circuit for practical application of the present invention is an LED lamp voltage stabilizing circuit that can automatically adapt to input voltage fluctuations, including a P-channel field effect transistor QP, an LED lamp and a voltage regulator D2, wherein the triode transistor is a P-channel field effect transistor QP, and the adaptive voltage stabilizing module 100 is the voltage regulator D2; the cathode of the LED lamp is electrically connected to the source S of the field effect transistor QP, the drain D of the field effect transistor QP is electrically connected to the negative electrode of the input power supply, and the positive electrode of the LED lamp is electrically connected to the positive electrode of the input power supply; the two ends of the voltage regulator D2 are electrically connected between the negative electrode of the input power supply and the gate G of the field effect transistor QP, wherein the cathode of the voltage regulator D2 is electrically connected to the gate G of the field effect transistor QP. The difference between this embodiment six and the embodiment one is that the N-channel field effect transistor QN is replaced by the P-channel field effect transistor QP, so the specific circuit is slightly different, and in order to indicate the difference, the numbers of the electronic components are different, but the principles are the same, and their working principles can be summarized. Figure 2B and Figure 3A In the first embodiment, the current path from the anode of the voltage regulator tube D2 to the cathode of the voltage regulator tube D2 is Figure 2B The fast discharge channel has a slow charging speed close to zero, and its operating voltage graph is as follows Figure 4F , 4G As shown in 4H, no further details are given here.

[0099] Embodiment 7, see Figure 4B The seventh embodiment is basically the same as the sixth embodiment, except that the adaptive voltage stabilizing module 100 further includes a resistor R2 and a capacitor C2, that is, the adaptive voltage stabilizing module 100 is a voltage stabilizing tube D2, a resistor R2 and a capacitor C2; the resistor R2 is electrically connected between the negative electrode of the input power supply and the gate G of the field effect tube QP, or it can be said that the resistor R2 is connected in parallel at both ends of the voltage stabilizing tube D2, and the capacitor C2 is electrically connected between the gate G of the field effect tube QP and the positive electrode of the input power supply. Figure 3B The second embodiment is similar to the embodiment 2, except that the N-channel field effect transistor QN is replaced by a P-channel field effect transistor QP, so the specific circuit is slightly different, and in order to distinguish, the electronic components are numbered differently.

[0100] Example 8, see Figure 4C, the eighth embodiment is basically the same as the seventh embodiment, except that the voltage regulator tube D2 is replaced by an adjustable voltage regulator tube D21, and the resistor R2 is replaced by two resistors R21 and R22, that is, the adaptive voltage regulator module 100 includes an adjustable voltage regulator tube D21, a resistor R21, a resistor R22 and a capacitor C2; the two ends of the adjustable voltage regulator tube D21 are electrically connected between the negative electrode of the input power supply and the gate G of the field effect tube QP, wherein the cathode of the adjustable voltage regulator tube D21 is electrically connected to the gate G of the field effect tube QP, the resistor R21 and the resistor R22 are connected in series and then connected in parallel at the two ends of the adjustable voltage regulator tube D21, the detection voltage end of the adjustable voltage regulator tube D21 is electrically connected to the electrical connection between the resistor R21 and the resistor R22, and the capacitor C2 is electrically connected between the gate G of the field effect tube QP and the positive electrode of the input power supply. The model of the adjustable voltage regulator tube D21 is TL431. The resistor R21 and the resistor R22 of the eighth embodiment are connected in series to not only set the stable voltage of the adjustable voltage regulator D21, but also play a role in Figure 4B The role of the resistor R2. Figure 3C The third embodiment is similar to the embodiment 1, except that the N-channel field effect transistor QN is replaced by a P-channel field effect transistor QP, so the specific circuit is slightly different, and in order to distinguish, the electronic components are numbered differently.

[0101] Example 9, see Figure 4D The ninth embodiment is basically the same as the seventh embodiment, except that the transistor T2 replaces the field effect transistor QP. Since the transistor is current-conducting, a resistor R23 is connected in series to the base of the transistor T2, that is, the base of the transistor T2 is electrically connected to the cathode of the voltage regulator tube D2 through the resistor R23, and the base of the transistor T2 is also electrically connected to the capacitor C2 and the resistor R2 through the resistor R23, respectively. The cathode of the LED lamp is electrically connected to the emitter of the transistor T2, and the collector of the transistor T2 is electrically connected to the cathode of the input power supply. The transistor T2 in the ninth embodiment is a PNP transistor. The ninth embodiment is similar to the seventh embodiment. Figure 3D The fourth embodiment is similar to the embodiment 1, except that a PNP transistor is used instead of an NPN transistor, so the specific circuit is slightly different, and in order to distinguish, the electronic components are numbered differently.

[0102] Example 10, see Figure 4E The tenth embodiment is basically the same as the seventh embodiment, except that the voltage regulator tube D2 is replaced by a diode D22; Figure 3E The fifth embodiment is similar to the embodiment 1, except that the N-channel field effect transistor QN is replaced by a P-channel field effect transistor QP, so the specific circuit is slightly different, and in order to distinguish, the electronic components are numbered differently.

[0103] Example 11, see Figure 5A , this embodiment eleven and Figure 3BThe embodiment 2 is similar to the embodiment 2, except that the connection method of the voltage regulator tube is different. Figure 3B The difference from the second embodiment is that different electronic components are numbered; that is, the adaptive voltage stabilizing module 100 of the eleventh embodiment is a voltage stabilizing tube D3, a resistor R3 and a capacitor C3, the resistor R3 is electrically connected between the positive electrode of the input power supply and the gate G of the field effect tube QN, the capacitor C3 is electrically connected between the gate G of the field effect tube QN and the negative electrode of the input power supply, and the voltage stabilizing tube D3 is electrically connected between the source S of the field effect tube QN and the gate G of the field effect tube QN, wherein the anode of the voltage stabilizing tube D3 is electrically connected to the source S of the field effect tube QN.

[0104] See also Figure 5A In the eleventh embodiment, the reverse breakdown voltage of the voltage regulator tube D3 is slightly larger than the turn-on voltage of the N-channel field effect tube QN (for example, the turn-on voltage of the field effect tube QN is 2 volts, and the reverse breakdown voltage of the voltage regulator tube D3 is 2.2 volts); the current path from the cathode of the voltage regulator tube D3 to the anode of the voltage regulator tube D3 is Figure 2 A fast discharge channel; in this way, when the minimum voltage value Vmin when the input voltage VAC fluctuates is less than the voltage of the gate G of the field effect tube QN, the difference between the voltage of the gate G of the field effect tube QN and the voltage of the source S of the field effect tube QN is greater than the reverse breakdown voltage of the voltage regulator D3, the voltage regulator D3 reversely breaks down, and the voltage of the gate G of the field effect tube QN drops, so as to keep the stable voltage Vm of the adaptive voltage regulation module 100 less than or equal to the sum of the minimum voltage value Vmin when the input voltage fluctuates and the turn-on voltage Von of the N-type triode transistor, that is, Vm≤(Vmin+Von); when the voltage rises when the input voltage VAC fluctuates, the voltage of the gate G of the field effect tube QN slowly rises through the resistor R3, so that the circuit can make the current flowing through the LED lamp change accordingly with the change of the input power, and when the input power is stable, the LED lamp enters a stable constant current state. Here, the reverse breakdown channel of the voltage regulator D3 is Figure 2 The fast discharge channel of the battery is the charging channel through the resistor R3. In fact, the gate voltage of the charging channel can be regarded as infinite. Therefore, there is actually no fast charging channel, only a slow charging channel through the resistor R3.

[0105] Example 12, see Figure 5B , this embodiment twelfth and Figure 4B The embodiment 7 is similar to the embodiment 7, except that the connection method of the voltage regulator tube is different. Figure 4BThe difference between the embodiment 7 and the embodiment 12 is that different electronic components are numbered; that is, the adaptive voltage stabilization module 100 of the embodiment 12 is a voltage stabilization tube D4, a resistor R4 and a capacitor C4, the resistor R4 is electrically connected between the negative electrode of the input power supply and the gate G of the field effect tube QP, the capacitor C4 is electrically connected between the gate G of the field effect tube QP and the positive electrode of the input power supply, and the voltage stabilization tube D4 is electrically connected between the source S of the field effect tube QP and the gate G of the field effect tube QP, wherein the cathode of the voltage stabilization tube D4 is electrically connected to the source S of the field effect tube QN. The embodiment 12 is different from the embodiment 12 of FIG. Figure 5A The embodiment eleven is similar to the embodiment eleven, except that the N-channel field effect transistor QN is replaced by a P-channel field effect transistor QP. Therefore, the specific circuit is slightly different, but the principle is the same. In order to distinguish them, the numbers of the electronic components are different.

[0106] The field effect tubes in the above embodiments can be replaced by triodes, and triodes can also be replaced by field effect tubes, which will not be described in detail here.

[0107] The present invention proposes another design idea. It does not use PWM dimming or thyristor dimming to control the on-time and off-time of the field effect tube or the transistor, nor does it need to use a voltage adjustment module to adjust the voltage of the gate of the field effect tube or the base of the transistor to adjust the voltage of the source of the field effect tube or the emitter of the transistor. Instead, it sets an adaptive voltage stabilizing module to automatically adapt to low-frequency voltage changes and filter out high-frequency voltage fluctuations. It does not require an active control circuit and is suitable for various dimming LED lamps connected to alternating current. It allows the current of the LED lamp to change accordingly with the change of input power, and filters out high-frequency fluctuations to maintain a constant voltage and current, eliminating the flicker of the LED lamp. It has the advantages of simple circuit structure, low cost, stable dimming, safety and reliability.

[0108] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A method for stabilizing a voltage of an LED lamp that can automatically adapt to fluctuations in input voltage, based on a circuit comprising a triode transistor and an LED lamp, wherein the triode transistor comprises a field effect transistor; the LED lamp is electrically connected to the source of the field effect transistor; the method comprises the following steps: An adaptive voltage stabilization module (100) is provided, wherein the adaptive voltage stabilization module (100) is electrically connected to the gate of the field effect tube, and the adaptive voltage stabilization module (100) is also electrically connected to an input power supply; The drain of the field effect transistor is electrically connected to the input power supply; The adaptive voltage stabilizing module (100) has two different current channels, charging and discharging; the adaptive voltage stabilizing module (100) is provided with a threshold voltage; and the adaptive voltage stabilizing module (100) comprises a voltage stabilizing tube; When the voltage difference caused by input power fluctuation causes the adaptive voltage stabilizing module (100) to discharge, the adaptive voltage stabilizing module (100) can discharge quickly through the discharge channel of the voltage stabilizing tube, and at this time the absolute value of the voltage of the adaptive voltage stabilizing module (100) decreases; When the voltage difference caused by the input power fluctuation causes the input power to charge the adaptive voltage regulator module (100), the adaptive voltage regulator module (100) can be charged through the charging channel, and the absolute value of the voltage of the adaptive voltage regulator module (100) increases; When the input power source charges the adaptive voltage stabilizing module (100), when the voltage difference is less than the threshold voltage of the adaptive voltage stabilizing module (100), the adaptive voltage stabilizing module (100) can be charged slowly through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module (100) increases slowly; when the voltage difference is greater than the threshold voltage of the adaptive voltage stabilizing module (100), the adaptive voltage stabilizing module can be charged quickly through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module increases quickly.

2. The LED lamp voltage stabilization method capable of automatically adapting to input voltage fluctuations according to claim 1 is characterized in that: The anode to cathode of the voltage regulator tube is a fast discharge channel of the adaptive voltage regulator module (100), and the reverse breakdown voltage of the voltage regulator tube is a threshold voltage of a charging channel of the adaptive voltage regulator module (100).

3. The voltage stabilization method for LED lamps capable of automatically adapting to input voltage fluctuations according to claim 1, characterized in that: The adaptive voltage stabilization module (100) further comprises a resistor and a capacitor, wherein the resistor and the voltage regulator are connected in parallel, and the capacitor and the voltage regulator are connected in series and electrically connected to both ends of the input power supply, and the series connection point is electrically connected to the gate of the field effect tube.

4. The LED lamp voltage stabilization method capable of automatically adapting to input voltage fluctuations according to claim 1 is characterized in that: The voltage regulator tube can be replaced by an adjustable voltage regulator tube or a diode.

5. The voltage stabilization method for LED lamps capable of automatically adapting to input voltage fluctuations according to claim 1, characterized in that: The adaptive voltage stabilizing module (100) further comprises a resistor, the reverse breakdown channel from the cathode to the anode of the voltage stabilizing tube is a fast discharge channel, and the input power slowly charges the adaptive voltage stabilizing module (100) through the resistor.

6. A voltage stabilizing circuit for an LED lamp capable of automatically adapting to input voltage fluctuations, comprising a triode transistor and an LED lamp, wherein the triode transistor comprises a field effect tube, and the LED lamp is electrically connected to the source of the field effect tube; characterized in that: The device also includes an adaptive voltage stabilizing module (100) having two different current channels, charging and discharging. The adaptive voltage stabilizing module (100) is electrically connected to the gate of the field effect tube. The adaptive voltage stabilizing module (100) is also electrically connected to the input power supply. The drain of the field effect tube is electrically connected to the input power supply. The adaptive voltage stabilizing module (100) is provided with a gate voltage. The adaptive voltage stabilizing module (100) includes a voltage stabilizing tube. When the voltage difference caused by the fluctuation of the input power supply causes the adaptive voltage stabilizing module (100) to discharge, the adaptive voltage stabilizing module (100) can discharge quickly through the discharge channel of the voltage stabilizing tube. At this time, the absolute value of the voltage of the adaptive voltage stabilizing module (100) decreases. When the voltage difference caused by the fluctuation of the input power supply causes the input When the power source charges the adaptive voltage stabilizing module (100), the adaptive voltage stabilizing module (100) can be charged through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module (100) increases; when the input power source charges the adaptive voltage stabilizing module (100), when the voltage difference is less than the threshold voltage of the adaptive voltage stabilizing module (100), the adaptive voltage stabilizing module (100) can be slowly charged through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module (100) increases slowly; when the voltage difference is greater than the threshold voltage of the adaptive voltage stabilizing module (100), the adaptive voltage stabilizing module can be quickly charged through the charging channel, and the absolute value of the voltage of the adaptive voltage stabilizing module increases quickly.

7. The LED lamp voltage stabilizing circuit capable of automatically adapting to input voltage fluctuations according to claim 6 is characterized in that: The anode to cathode of the voltage regulator tube is a fast discharge channel of the adaptive voltage regulator module (100), and the reverse breakdown voltage of the voltage regulator tube is a threshold voltage of a charging channel of the adaptive voltage regulator module (100).

8. The LED lamp voltage stabilizing circuit capable of automatically adapting to input voltage fluctuations according to claim 6, characterized in that: The adaptive voltage stabilization module (100) further comprises a resistor and a capacitor, wherein the resistor and the voltage regulator are connected in parallel, and the capacitor and the voltage regulator are connected in series and electrically connected to both ends of the input power supply, and the series connection point is electrically connected to the gate of the field effect tube.

9. The LED lamp voltage stabilizing circuit capable of automatically adapting to input voltage fluctuations according to claim 6, characterized in that: The voltage regulator tube can be replaced by an adjustable voltage regulator tube or a diode.

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