CN210328078U

CN210328078U - Low-voltage stroboflash-free built-in power supply of lamp

Info

Publication number: CN210328078U
Application number: CN201920322238.4U
Authority: CN
Inventors: 肖波
Original assignee: Shenzhen Xinyuan United Technology Co ltd
Current assignee: Shenzhen Xinyuan United Technology Co ltd
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2020-04-14
Anticipated expiration: 2029-03-13

Abstract

The utility model discloses a lamps and lanterns low pressure does not have stroboscopic built-in power supply, this lamps and lanterns low pressure does not have stroboscopic built-in power supply include alternating current power supply input end, input rectification filter circuit, LLC switch circuit, first transformer, output rectification filter circuit and control circuit, input rectification filter circuit's input with alternating current power supply input end is connected, input rectification filter circuit's output with LLC switch circuit's power input end is connected, LLC switch circuit's power input end with the input of first transformer is connected, LLC switch circuit's driven end with control circuit's drive output end is connected; and the output end of the first transformer is connected with the output rectifying and filtering circuit. The utility model discloses technical scheme has solved lamps and lanterns low pressure internal power supply's stroboscopic problem.

Description

Low-voltage stroboflash-free built-in power supply of lamp

Technical Field

The utility model relates to an internal power supply technical field, in particular to lamps and lanterns low pressure does not have stroboscopic internal power supply.

Background

Strobing of early fluorescent lamps was a common problem, and as time went by, the increasingly powerful electronic ballasts had largely eliminated the strobe interference and were not perceived by humans. Nowadays, LED lamps relate to various fields, and the driving function of the LED lamps is very important in order to realize light without stroboflash as far as possible. The stroboflash is the change of intensity or luminance of light in certain time cycle, stroboflash can appear in many illumination applications, and the stroboflash can influence human health, and the influence degree depends on stroboflash's frequency and individual to the sensitivity of stroboflash, and is especially serious to the light that the luminance is different, and high frequency stroboflash can not produce the obvious influence to the human body, and the low frequency stroboflash of below 120 hertz influences human health very easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lamps and lanterns low pressure does not have stroboscopic built-in power supply, aims at realizing lamps and lanterns low pressure built-in power supply's no stroboscopic.

In order to achieve the above purpose, the low-voltage stroboflash-free built-in power supply for a lamp provided by the utility model comprises an alternating current power supply input end, an input rectifying and filtering circuit, an LLC switching circuit, a first transformer, an output rectifying and filtering circuit and a control circuit,

the input end of the input rectifying filter circuit is connected with the input end of the alternating current power supply, the output end of the input rectifying filter circuit is connected with the power supply input end of the LLC switch circuit, the power supply input end of the LLC switch circuit is connected with the input end of the first transformer, and the driven end of the LLC switch circuit is connected with the driving output end of the control circuit; the output end of the first transformer is connected with the output rectifying and filtering circuit;

the input rectifying and filtering circuit is used for rectifying an alternating current power supply input by commercial power into a direct current power supply and carrying out filtering processing;

the LLC switching circuit is used for carrying out resonance processing on the power supply signal output by the input rectifying and filtering circuit based on the control of the control circuit so as to drive the first transformer to work;

the first transformer is used for performing voltage transformation according to the drive of the LLC switching circuit;

and the output rectifying and filtering circuit is used for rectifying and filtering the power supply signal transformed by the first transformer and then outputting the power supply signal so as to drive the lamp to work.

Optionally, the built-in power supply of lamps and lanterns low pressure no stroboscopic still includes EMC filter circuit, EMC filter circuit connect in alternating current power supply input with between the input of input rectification filter circuit, EMC filter circuit is used for carrying out EMC filtering to the alternating current power supply of input.

Optionally, the input rectifying and filtering circuit includes a first diode, a second diode, a third diode, a fourth diode, and a first polarity capacitor, a cathode of the first diode, a cathode of the second diode, and an anode of the first polarity capacitor are connected to each other, an anode of the third diode and an anode of the fourth diode are connected to each other, an anode of the first diode is connected to a cathode of the fourth diode, an anode of the second diode is connected to a cathode of the third diode, an anode of an ac power supply is connected between an anode of the second diode and a cathode of the third diode, and an anode of an ac power supply is connected between an anode of the first diode and a cathode of the fourth diode.

Optionally, the LLC switch circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor, a first MOS transistor, a second MOS transistor, and a second transformer, where the second transformer has a first primary coil, a first secondary coil, and a second secondary coil, a first end of the first resistor is connected to an upper end of the first secondary coil, a second end of the first resistor is connected to a first end of the first capacitor, a second end of the first capacitor is connected to a lower end of the first secondary coil, a first end of the second resistor is connected to a lower end of the second secondary coil, a second end of the second resistor is connected to a first end of the second capacitor, and a second end of the second capacitor is connected to an upper end of the second secondary coil;

the grid electrode of the first MOS tube is connected between the second end of the first resistor and the first end of the first capacitor, the source electrode of the first MOS tube is respectively connected with the second end of the first capacitor, the lower end of the first secondary coil and the lower end of the first primary coil, the drain electrode of the first MOS tube is connected to the positive output end of the input rectification filter circuit, the grid electrode of the second MOS tube is connected between the second end of the second resistor and the first end of the second capacitor, the source electrode of the second MOS tube is respectively connected with the second end of the second capacitor, the upper end of the second secondary coil and the negative output end of the input rectification filter circuit, and the drain electrode of the second MOS tube is respectively connected with the lower end of the first secondary coil, the second end of the first capacitor and the source electrode of the first MOS tube.

Optionally, the output rectifying and filtering circuit includes a fifth diode, a sixth diode, and a second polarity capacitor, an anode of the fifth diode is connected to the sixth end of the first transformer, a cathode of the fifth diode is connected to an anode of the second polarity capacitor, an anode of the sixth diode is connected to the seventh end of the first transformer, a cathode of the sixth diode is connected between a cathode of the fifth diode and an anode of the second polarity capacitor, and a cathode of the second polarity capacitor is connected to the eighth end of the first transformer.

Optionally, the control circuit includes a control chip, the control chip includes a power input pin, a first driving pin, a second driving pin, a feedback input pin and a ground pin, the power input pin is a power input end of the control chip, the first driving pin is a first driving end of the control chip, the second driving pin is a second driving end of the control chip, and the feedback input pin is a feedback end of the control circuit.

The technical scheme of the utility model is through adopting lamps and lanterns low pressure no stroboscopic built-in power supply to include alternating current power supply input end, input rectification filter circuit, LLC switch circuit, first transformer, output rectification filter circuit and control circuit, input rectification filter circuit's input with alternating current power supply input end is connected, input rectification filter circuit's output with LLC switch circuit's power input end is connected, LLC switch circuit's power input end with the input of first transformer is connected, LLC switch circuit's driven end with control circuit's drive output end is connected; the output end of the first transformer is connected with the output rectifying and filtering circuit; the input rectifying and filtering circuit is used for rectifying an alternating current power supply input by commercial power into a direct current power supply and carrying out filtering processing; the LLC switch circuit is used for carrying out resonance processing on the power supply signal output by the input rectifying and filtering circuit based on the control of the control circuit so as to drive the first transformer to work, so that the loss of an MOS (metal oxide semiconductor) tube in the LLC switch circuit is reduced, high-efficiency output is realized, the conversion efficiency of the non-stroboscopic built-in power supply is improved, and meanwhile, the non-stroboscopic output of the non-stroboscopic built-in power supply is realized; the first transformer is used for performing voltage transformation according to the drive of the LLC switching circuit; and the output rectifying and filtering circuit is used for rectifying and filtering the power supply signal transformed by the first transformer and then outputting the power supply signal to drive the lamp to work, so that the non-stroboscopic work of the low-voltage non-stroboscopic built-in power supply of the lamp is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of a low-voltage strobe-free internal power supply of a lamp of the present invention;

fig. 2 is a circuit structure diagram of an embodiment of the low-voltage stroboflash-free built-in power supply of the lamp of the present invention;

fig. 3 is the circuit structure diagram of an embodiment of the LLC half-bridge converter in the low-voltage non-strobe built-in power supply of the lamp.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				110	EMC filter circuit	140	First transformer
120	Input rectification filter circuit	150	Output rectifying filter circuit
				130	LLC switching circuit	160	Control circuit
170	Lamp fitting	Q2	Second MOS transistor
				D1	First diode	VT1	Third MOS transistor
D2	Second diode	VT2	Fourth MOS transistor
				D3	Third diode	L1	First inductor
D4	Fourth diode	R1	A first resistor
				D5	Fifth diode	R2	Second resistance
D6	Sixth diode	C1	First capacitor
				VD1	Seventh diode	C2	Second capacitor
VD2	Eighth diode	C3	Third capacitor
				T1	First transformer	C4	Fourth capacitor
T2	Second transformer	C5	Fifth capacitor
				T3	Third transformer	C6	First polarity capacitor
Q1	First MOS transistor	C7	Second polarity capacitor

The realization, the functional characteristics and the feasible points of the utility model are further explained by referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a lamps and lanterns low pressure does not have stroboscopic built-in power supply, however, the stroboscopic of early fluorescent lamp is a very common problem, and along with the lapse of time, stroboscopic interference has been eliminated at to a great extent to powerful electronic ballast increasingly, lets the people not feel the stroboscopic. Nowadays, the LED lamp is involved in various fields including general lighting, signal lamp prompting, and the like, and people face the problem of stroboflash again. And the function of driving the LED lamp is important for realizing the lamplight without stroboflash as far as possible. Stroboscopic is the variation of the intensity or brightness of light over a period of time, and is found in many lighting applications, including slow motion photography on television, tunnel lighting, various areas of general lighting, and workplaces using fast rotating machinery. The stroboflash can affect human health, the influence degree depends on the stroboflash frequency and the sensitivity of individuals to the stroboflash, the stroboflash is particularly serious for lights with different brightness, although the high-frequency stroboflash can not have obvious influence on human bodies, the stroboflash with the low frequency below 120 Hz can easily affect the human health.

In order to solve the above problem, in an embodiment of the present invention, as shown in fig. 1, the low-voltage non-strobe built-in power supply of the lamp includes an ac power input terminal, an input rectifying and filtering circuit 120, an LLC switching circuit 130, a first transformer 140, an output rectifying and filtering circuit 150, and a control circuit 160,

the input end of the input rectifying and filtering circuit 120 is connected to the input end of the ac power supply, the output end of the input rectifying and filtering circuit 120 is connected to the power input end of the LLC switch circuit 130, the power input end of the LLC switch circuit 130 is connected to the input end of the first transformer 140, and the driven end of the LLC switch circuit 130 is connected to the driving output end of the control circuit 160; the output end of the first transformer 140 is connected to the output rectifying and filtering circuit 150;

the input rectifying and filtering circuit 120 is configured to rectify an ac power input by a mains supply into a dc power and perform filtering processing;

the LLC switch circuit 130 is configured to perform resonance processing on the power signal output by the input rectifying and filtering circuit 120 based on the control of the control circuit 160, so as to drive the first transformer 140 to operate;

the first transformer 140 is configured to perform a voltage transformation operation according to the driving of the LLC switching circuit 130;

the output rectifying and filtering circuit 150 is configured to rectify and filter the power signal transformed by the first transformer 140 and output the rectified and filtered power signal, so as to drive the lamp 170 to work.

In this embodiment, as shown in fig. 2, for the LLC switching circuit 130, the LLC switching circuit 130 has two resonant frequencies, one is a resonant point of Lr and Cr, and the other is determined by Lm, Cr and the load condition, the load is heavier, and the resonant frequency will be higher. The calculation formula of these two resonance points is as follows:

when the circuit works under the condition of heavy load, a series resonance loop is formed by the leakage inductance resonance capacitor and the load, and the resonance rate is as follows:

when the LLC switching circuit 130 operates in no-load, a series resonant circuit is formed by the leakage inductance resonant capacitor and the excitation inductor, and the resonant ratio is:

in this circuit, the operating frequency needs to be set around fr1 because of the need for efficiency improvement; fr1 is the resonance frequency of Cr and Lr series resonator. When the input voltage drops, a larger gain can be obtained by lowering the operating frequency. By selecting proper resonance parameters, the LLC switch circuit 130 can operate in the zero-voltage operating region regardless of load variations or input voltage variations. The LLC switching circuit 130 works as follows: the first MOS transistor Q1 is turned off, the second MOS transistor Q2 is turned on, and the current on the resonant inductor is negative at the moment and flows to the second MOS transistor Q2 in the direction; in the stage, the leakage inductance of the transformer does not participate in resonance, the Cr and the Lr form a resonance frequency, the output energy comes from the Cr and the Lr, and the stage is finished along with the turn-off of the second MOS transistor Q2, so that the total harmonic of the THD is smaller than 10, the ultra-low switching loss and the ultra-high efficiency are achieved, the overall cost of implementation can be reduced due to the fact that no output inductance is needed, the pressure reliability of a primary side element can be reduced due to the fact that a half-bridge configuration is adopted, and the stability is high. The switching action of the LLC switching circuit 130 is the same as that of the half-bridge circuit, but due to the addition of the resonant cavity, the first MOS transistor Q1 in the LLC switching circuit 130 is turned off, and the second MOS transistor Q2 is in different working conditions, so that the MOS transistor can be turned on at zero voltage.

In this embodiment, alternating current pulsating current is generated on the secondary side by alternately conducting the switching tube VT1 and the switching tube VT2, and is converted into a direct current signal through full-wave rectification of the diode VD1 and the diode VD2, and then the direct current signal is filtered by the LC and sent to a load to realize output without stroboflash.

In this embodiment, the lamp low-voltage non-strobe built-in power supply further includes an EMC filter circuit 110, the EMC filter circuit 110 is connected between the input end of the ac power supply and the input end of the input rectification filter circuit 120, and the EMC filter circuit 110 is configured to perform EMC filtering processing on the input ac power supply. It is understood that EMC, i.e., electromagnetic compatibility, refers to the ability of a device or system to perform satisfactorily in its electromagnetic environment and not to generate intolerable electromagnetic interference with any device in its environment. Therefore, EMC includes two requirements: on one hand, the electromagnetic interference generated to the environment by the equipment in the normal operation process cannot exceed a certain limit value; another aspect is that the appliance has a degree of immunity to electromagnetic interference present in the environment, i.e., electromagnetic susceptibility. In this embodiment, EMC filtering is performed on the input 220V ac power supply to filter some electromagnetic interference of the non-strobe built-in power supply.

In the above embodiment, the lamp low-voltage non-stroboscopic internal power supply includes an ac power input terminal, an input rectification filter circuit 120, an LLC switch circuit 130, a first transformer 140, an output rectification filter circuit 150, and a control circuit 160, where an input terminal of the input rectification filter circuit 120 is connected to the ac power input terminal, an output terminal of the input rectification filter circuit 120 is connected to a power input terminal of the LLC switch circuit 130, a power input terminal of the LLC switch circuit 130 is connected to an input terminal of the first transformer 140, and a driven terminal of the LLC switch circuit 130 is connected to a driving output terminal of the control circuit 160; the output end of the first transformer 140 is connected to the output rectifying and filtering circuit 150; the input rectifying and filtering circuit 120 is configured to rectify an ac power input by a mains supply into a dc power and perform filtering processing; the LLC switch circuit 130 is configured to perform resonance processing on the power signal output by the input rectifying and filtering circuit 120 based on the control of the control circuit 160, so as to drive the first transformer 140 to operate, so that the MOS transistor loss in the LLC switch circuit 130 is reduced, and high-efficiency output is achieved, so as to improve the conversion efficiency of the non-strobe internal power supply and achieve non-strobe output of the non-strobe internal power supply; the first transformer 140 is configured to perform a voltage transformation operation according to the driving of the LLC switch circuit 120; the output rectifying and filtering circuit 150 is configured to rectify and filter the power signal transformed by the first transformer 140 and output the rectified and filtered power signal to drive the lamp 170 to operate, so as to implement the non-stroboscopic operation of the low-voltage non-stroboscopic internal power supply of the lamp.

In an embodiment, as shown in fig. 2, the input rectifying and filtering circuit 120 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a first polarity capacitor C6, wherein a cathode of the first diode D1, a cathode of the second diode D2, and an anode of the first polarity capacitor C6 are connected to each other, an anode of the third diode D3 and an anode of the fourth diode D4 are connected to each other, an anode of the first diode D1 is connected to a cathode of the fourth diode D4, an anode of the second diode D2 is connected to a cathode of the third diode D3, an anode of the second diode D2 is connected to an anode of the third diode D3, and an anode of the first diode D1 is connected to an anode of the fourth diode D4.

In one embodiment, as shown in fig. 2, the LLC switch circuit 130 includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a first MOS transistor Q1, a second MOS transistor Q2, and a second transformer T2, the second transformer has a first primary coil, a first secondary coil and a second secondary coil, a first end of the first resistor R1 is connected with an upper end of the first secondary coil, a second terminal of the first resistor R1 is connected to a first terminal of the first capacitor C1, a second terminal of the first capacitor C1 is connected to a lower terminal of the first secondary winding, a first end of the second resistor R2 is connected with a lower end of the second secondary coil, a second end of the second resistor R2 is connected with a first end of the second capacitor C2, a second end of the second capacitor C2 is connected with an upper end of the second secondary coil, the DC power supply is used for storing the DC power supply after rectification and filtering or outputting the DC power supply after rectification and filtering;

a gate of the first MOS transistor Q1 and a gate of the second MOS transistor Q2, a source of the first MOS transistor Q1 is connected between the second end of the first resistor R1 and the first end of the first capacitor C1, a source of the first MOS transistor Q1 is respectively connected to the second end of the first capacitor C1, the lower end of the first secondary coil, and the lower end of the first primary coil, a drain of the first MOS transistor Q1 is connected to the positive output end of the input rectifying and filtering circuit 120, a gate of the second MOS transistor Q2 is connected between the second end of the second resistor R2 and the first end of the second capacitor C2, a source of the second MOS transistor Q2 is respectively connected to the second end of the second capacitor C2, the upper end of the second secondary coil, and the negative output end of the input rectifying and filtering circuit 120, a drain of the second MOS transistor Q2 is respectively connected to the lower end of the first secondary coil, the second end of the first capacitor C1, and the source of the second MOS transistor Q1, for controlling the switching on/off of the LLC circuit. It is understood that, here, the upper end of the first primary coil of the second transformer T2 is the sixth end of the second transformer T2 in fig. 2, the lower end of the first primary coil is the third end of the second transformer T2 in fig. 2, the upper end of the first secondary coil is the second end of the second transformer T2 in fig. 2, the lower end of the first secondary coil is the seventh end of the second transformer T2 in fig. 2, the upper end of the second secondary coil is the fourth end of the second transformer T2 in fig. 2, and the lower end of the second secondary coil is the fifth end of the second transformer T2 in fig. 2.

In this embodiment, the LLC of the LLC switching circuit 130 is a soft switch, and for a common topology, when a switching tube is switched, a voltage between a drain and a source of an MOS tube overlaps with a current, so that a switching loss is generated. The switch tube is conducted when the current is negative, the current flows through a diode in the switch tube before the switch tube is conducted, the voltage between the drain electrode and the source electrode of the switch tube is clamped at 0V, the diode is turned on at the moment, and zero-voltage switching-on can be realized, so that the MOS tube has low loss, the effect of high-efficiency output is realized, and the conversion efficiency of the built-in power supply is improved.

In an embodiment, the output rectifying and filtering circuit 150 includes a fifth diode D5, a sixth diode D6, and a second polarity capacitor C7, an anode of the fifth diode D5 is connected to the sixth end of the first transformer T1, a cathode of the fifth diode D5 is connected to an anode of the second polarity capacitor C7, an anode of the sixth diode D6 is connected to the seventh end of the first transformer T1, a cathode of the sixth diode D6 is connected between a cathode of the fifth diode D5 and an anode of the second polarity capacitor C7, and a cathode of the second polarity capacitor C7 is connected to the eighth end of the first transformer T1, so that a power signal transformed by the first transformer T1 is rectified, filtered and output to drive and control the lamp 170. It is understood that the first transformer T1 is the first transformer 140.

In an embodiment, the overall model of the LLC switching circuit can be simplified as the LLC half-bridge resonant circuit shown in fig. 3, which includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a third MOS transistor VT1, a fourth MOS transistor VT2, a third transformer T3, a seventh diode VD1, an eighth diode VD2, and a first inductor L1, the drain of the third MOS transistor VT1 is connected to the positive terminal of the power input terminal and the first terminal of the third capacitor C3, the source of the third MOS transistor VT1 is connected to the first terminal of the primary side of the third transformer T3 and the drain of the fourth MOS transistor VT2, the source of the fourth MOS transistor VT2 is connected to the negative terminal of the power input terminal and the second terminal of the fourth capacitor C4, the second terminal of the third capacitor C3 and the first terminal of the fourth capacitor C4 are connected to each other, and the second terminal of the third transformer T3 is connected between the second terminal of the primary side of the third capacitor C67 3 6 and the second terminal of the fourth capacitor C4, a first end of a secondary side of the third transformer T3 is connected to an anode of the seventh diode VD1, a cathode of the seventh diode VD1 is connected to a first end of the first inductor L1, a second end of the secondary side of the third transformer T3 is connected to an anode of the eighth diode VD2, cathodes of the eighth diode VD2 are connected to a cathode of the seventh diode VD1 and a first end of the first inductor L1, respectively, a second end of the first inductor L1 is connected to a first end of the fifth capacitor C5, a second end of the fifth capacitor C5 is connected between the first end and the second end of the secondary side of the third transformer T3, and the fifth capacitor C5 is connected to an output end of the power supply.

In this embodiment, as shown in fig. 3, that is, the third MOS transistor VT1 and the fourth MOS transistor VT2 are turned on in turn, the primary winding side of the third transformer T3 generates an alternating current through the power supply Ui, the third MOS transistor VT1, the first end N1 of the primary winding of the third transformer T3, the fourth capacitor C4, the power supply Ui, the third capacitor C3, the first end N1 of the primary winding of the third transformer T3, the fourth MOS transistor VT2, and the power supply Ui, so that an alternating pulsating current is generated on the secondary winding side of the third transformer T3, rectified and converted into a direct current signal through the seventh diode VD1 and the eighth diode VD2, and filtered through the inductor L and the fifth capacitor C5, that the alternating current is sent to the load to achieve output without stroboflash, and output to the LED lamp to achieve no stroboflash.

In an embodiment, as shown in fig. 2, the control circuit includes a control chip U1, the control chip includes a power input pin, a first driving pin, a second driving pin, a feedback input pin, and a ground pin, the power input pin is a power input end of the control chip, the first driving pin is a first driving end of the control chip, the second driving pin is a second driving end of the control chip, and the feedback input pin is a feedback end of the control circuit 160.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A low-voltage stroboflash-free built-in power supply for a lamp is characterized by comprising an alternating current power supply input end, an input rectifying and filtering circuit, an LLC switch circuit, a first transformer, an output rectifying and filtering circuit and a control circuit,

2. The lamp low-voltage strobe-free built-in power supply of claim 1, further comprising an EMC filter circuit connected between the ac power input terminal and the input terminal of the input rectifying filter circuit, wherein the EMC filter circuit is configured to perform EMC filtering processing on the input ac power.

3. The lamp low-voltage non-stroboscopic internal power supply of claim 1, wherein the input rectifying filter circuit comprises a first diode, a second diode, a third diode, a fourth diode and a first polarity capacitor, wherein a cathode of the first diode, a cathode of the second diode and an anode of the first polarity capacitor are connected with each other, an anode of the third diode and an anode of the fourth diode are connected with each other, an anode of the first diode is connected with a cathode of the fourth diode, an anode of the second diode is connected with a cathode of the third diode, an anode of an alternating current power supply is connected between an anode of the second diode and a cathode of the third diode, and an anode of the first diode and a cathode of the fourth diode are connected with an anode of the alternating current power supply.

4. The lamp low-voltage non-stroboscopic internal power supply according to claim 1, wherein the LLC switching circuit comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a first MOS transistor, a second MOS transistor, and a second transformer, the second transformer has a first primary coil, a first secondary coil, and a second secondary coil, a first end of the first resistor is connected to an upper end of the first secondary coil, a second end of the first resistor is connected to a first end of the first capacitor, a second end of the first capacitor is connected to a lower end of the first secondary coil, a first end of the second resistor is connected to a lower end of the second secondary coil, a second end of the second resistor is connected to a first end of the second capacitor, and a second end of the second capacitor is connected to an upper end of the second secondary coil;

5. The lamp low-voltage non-stroboscopic internal power supply according to claim 1, wherein the output rectifying and filtering circuit comprises a fifth diode, a sixth diode and a second polarity capacitor, an anode of the fifth diode is connected to the sixth end of the first transformer, a cathode of the fifth diode is connected to an anode of the second polarity capacitor, an anode of the sixth diode is connected to the seventh end of the first transformer, a cathode of the sixth diode is connected between a cathode of the fifth diode and an anode of the second polarity capacitor, and a cathode of the second polarity capacitor is connected to the eighth end of the first transformer.

6. The lamp low-voltage non-strobe built-in power supply of claim 1, wherein the control circuit comprises a control chip, the control chip comprises a power input pin, a first driving pin, a second driving pin, a feedback input pin and a ground pin, the power input pin is a power input end of the control chip, the first driving pin is a first driving end of the control chip, the second driving pin is a second driving end of the control chip, and the feedback input pin is a feedback end of the control circuit.