CN203167377U - A non-isolated driving power supply used for a LED fluorescent lamp - Google Patents

A non-isolated driving power supply used for a LED fluorescent lamp Download PDF

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Publication number
CN203167377U
CN203167377U CN2013201653843U CN201320165384U CN203167377U CN 203167377 U CN203167377 U CN 203167377U CN 2013201653843 U CN2013201653843 U CN 2013201653843U CN 201320165384 U CN201320165384 U CN 201320165384U CN 203167377 U CN203167377 U CN 203167377U
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power supply
resistance
semiconductor
oxide
supply ground
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Expired - Fee Related
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CN2013201653843U
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Chinese (zh)
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吴峰
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Shenzhen Spark Energy Saving Services Co Ltd
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Shenzhen Spark Energy Saving Services Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

The utility model discloses a non-isolated driving power supply used for a LED fluorescent lamp. The non-isolated driving power supply comprises a rectifier BD1, a PFC chip U1 equipped with a peripheral circuit, a MOS tube Q1, and an inductor L1. The model of the PFC chip U1 is QX9911. When the input voltage of the driving power supply is relatively high or relatively low, the PFC chip U1 adjusts the duty cycle of a pulse width modulation signal outputted by the PFC chip U1 in real time according to sampled current, and further adjusts the turn-on time and the turn-off time of the MOS tube Q1. And then, in cooperation with the flyback voltage boost of the inductor L1 and a capacitor C6, the LED fluorescent lamp acquires continuous and stable supplied voltage and thus input with wide voltage is achieved. The driving power supply with simple structure and low cost uses the high-precision driving chip QX9911 and increases the power factor and conversion efficiency of the driving power supply.

Description

A kind of LED fluorescent lamp is with non-isolation drive power supply
Technical field
The utility model relates to the driving power technical field, relates in particular to a kind of LED fluorescent lamp with non-isolation drive power supply.
Background technology
In the lighting apparatus field, although the LED fluorescent lamp is than common daylight lamp energy-saving and luminous efficiency height, but it can not be as the direct use utility grid voltage of common fluorescent lamp, so must be furnished with special-purpose voltage conversion apparatus, provide can driving LED rated voltage and electric current, just can make the LED operate as normal, this voltage conversion apparatus is exactly so-called LED fluorescent lamp driving power supply.In order to satisfy the demand of different markets and country variant, and the extensive use along with the white-hot trend of low-carbon energy-saving policy and LED product, market is to the higher requirement of the driving power proposition of the wide voltage input of 100~240VAC, the LED fluorescent lamp driving power supply that meets the input of wide voltage at present and have a High Power Factor mostly is isolated, but isolated driving power is because its circuit structure complexity, element is more, so have higher cost.And common non-isolated LED daylight lamp power source only allows to import univoltage, be difficult to realize wide voltage input, and power factor is less.Therefore, existing LED fluorescent lamp driving power supply exist cost higher, be difficult to realize the input of wide voltage and the little defective of power factor.
The utility model content
The technical problems to be solved in the utility model is, provides a kind of LED fluorescent lamp with non-isolation drive power supply, and this driving power has not only been realized wide voltage input, and has lower cost and higher power factor.
For solving the problems of the technologies described above, the utility model adopts following technical scheme.
A kind of LED fluorescent lamp is with non-isolation drive power supply, it includes a rectifier BD1, one disposes the PFC chip U1 of peripheral circuit, one metal-oxide-semiconductor Q1 and an inductance L 1, the chip model of described PFC chip U1 is QX9911, the input of described rectifier BD1 connects electrical network, its negative pole of output end connects front end power supply ground, its output head anode connects the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is by resistance R parallel with one another 9, resistance R 10 and resistance R 11 and be connected to power supply ground, rear end, the source electrode of this metal-oxide-semiconductor Q1 also connects the negative electrode of diode D1, the anode of diode D1 connects front end power supply ground, the pulse signal output end GD of described PFC chip U1 connects the negative electrode of diode D3, the anode of diode D3 connects the grid of metal-oxide-semiconductor Q1, described diode D3 is parallel with resistance R 6, the grid of metal-oxide-semiconductor Q1 also is connected to power supply ground, rear end by resistance R 13, the current sample end CS of described PFC chip U1 links to each other with the source electrode of metal-oxide-semiconductor Q1, its zero current detection end ZCD is by resistance R 7 and resistance R 8 centre cap that is connected to inductance L 1 of series connection successively, first end of described inductance L 1 connects power supply ground, rear end, its second end is connected to front end power supply ground by capacitor C parallel with one another 6 and resistance R 12, second end of described inductance L 1 is the output head anode of driving power, and described front end power supply ground is the negative pole of output end of driving power.
Preferably, in the peripheral circuit of described PFC chip U1, the output head anode of rectifier BD1 is by resistance R 1 and resistance R 2 positive pole that is connected to electrochemical capacitor C4 of series connection successively, the negative pole of electrochemical capacitor C4 is connected to power supply ground, rear end, the tie point of described resistance R 2 and electrochemical capacitor C4 links to each other with the power end VCC of PFC chip U1, the feedback end FB of PFC chip U1 is connected in the source electrode of metal-oxide-semiconductor Q1 by resistance R 3, its feedback end FB and error amplifier output Ctrl are connected to power supply ground, rear end by capacitor C 2 and capacitor C 3 respectively, its non-essential resistance end Rt is connected to power supply ground, rear end by resistance R 4, and its earth terminal GND is connected in power supply ground, rear end.
Preferably, be connected with capacitor C 1 between the output head anode of described rectifier BD1 and the negative pole of output end, described capacitor C 1 is filter capacitor.
Preferably, the centre cap of described inductance L 1 also connects the anode of diode D2, and the negative electrode of diode D2 is connected to the power end VCC of PFC chip U1 by resistance R 5.
The disclosed LED fluorescent lamp of the utility model is with in the non-isolation drive power supply, LED is fluorescent lamps connected to be connected between the output head anode and negative pole of output end of driving power, when higher or low when the input voltage of driving power, PFC chip U1 adjusts the duty ratio of pulse-width signal in real time according to its sample rate current, the step of going forward side by side is put in order the duration that turns on and off of metal-oxide-semiconductor Q1, cooperate the anti-commendable increase of inductance L 1 and capacitor C 6 to press again, make that the LED fluorescent lamp obtains continuing and stable supply power voltage, thereby realized wide voltage input.Because this driving power is non-isolated, so circuit structure is simpler, has reduced the cost of product.Simultaneously, PFC chip U1 has adopted high-precision QX9911 to drive chip, so improved power factor and the conversion efficiency of this driving power.In addition, under the acting in conjunction of resistance R 6, diode D3 and resistance R 13, also improve the switching speed of metal-oxide-semiconductor Q1, made this driving power have reliability preferably.
Description of drawings
Fig. 1 is the LED fluorescent lamp that the utility model proposes with the circuit theory diagrams of non-isolation drive power supply.
Embodiment
Below in conjunction with drawings and Examples the utility model is done more detailed description.
The utility model discloses a kind of LED fluorescent lamp with non-isolation drive power supply, as shown in Figure 1, described driving power includes a rectifier BD1, one disposes the PFC chip U1 of peripheral circuit, one metal-oxide-semiconductor Q1 and an inductance L 1, the chip model of described PFC chip U1 is QX9911, the input of described rectifier BD1 connects electrical network, its negative pole of output end connects front end power supply ground, its output head anode connects the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is by resistance R parallel with one another 9, resistance R 10 and resistance R 11 and be connected to power supply ground, rear end, the source electrode of this metal-oxide-semiconductor Q1 also connects the negative electrode of diode D1, the anode of diode D1 connects front end power supply ground, the pulse signal output end GD of described PFC chip U1 connects the negative electrode of diode D3, the anode of diode D3 connects the grid of metal-oxide-semiconductor Q1, described diode D3 is parallel with resistance R 6, the grid of metal-oxide-semiconductor Q1 also is connected to power supply ground, rear end by resistance R 13, the current sample end CS of described PFC chip U1 links to each other with the source electrode of metal-oxide-semiconductor Q1, its zero current detection end ZCD is by resistance R 7 and resistance R 8 centre cap that is connected to inductance L 1 of series connection successively, first end of described inductance L 1 connects power supply ground, rear end, its second end is connected to front end power supply ground by capacitor C parallel with one another 6 and resistance R 12, second end of described inductance L 1 is the output head anode of driving power, and described front end power supply ground is the negative pole of output end of driving power.
In this driving power, LED is fluorescent lamps connected to be connected between the output head anode and negative pole of output end of driving power, the pulse signal output end GD output pulse width modulation signal of PFC chip U1 is to the grid of metal-oxide-semiconductor Q1, when described pulse-width signal is high level, metal-oxide-semiconductor Q1 conducting, at this moment, the source electrode of the drain electrode of the output head anode of rectifier BD1, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1, resistance R 11, power supply ground, rear end, inductance L 1, resistance R 12 and front end power supply ground constitute the loop, rectifier BD1 output DC is depressed into inductance L 1, inductance L 1 energy storage; When described pulse-width signal is low level, metal-oxide-semiconductor Q1 turn-offs, electric current moment in above-mentioned loop is zero, and under the anti-commendable increase pressure effect of inductance L 1 and capacitor C 6, second end of inductance L 1 produces higher forward voltage, at this moment, first end of second end of inductance L 1, LED fluorescent lamp, front end power supply ground, diode D1, resistance R 11, power supply ground, rear end and inductance L 1 constitutes the loop, the forward voltage of inductance L 1 second end is lighted the LED fluorescent lamp, under this state, diode D1 is as fly-wheel diode, and front end power supply ground and power supply ground, rear end are all as electrical nodal.Wherein, the current sample end CS of PFC chip U1 also samples to the electric current that flows through above-mentioned two loops in real time, when higher or low when the input voltage of driving power, PFC chip U1 also adjusts the duty ratio of the pulse-width signal of its output in real time according to sample rate current, the step of going forward side by side is put in order the duration that turns on and off of metal-oxide-semiconductor Q1, and cooperate the anti-commendable increase of inductance L 1 and capacitor C 6 to press, make that the LED fluorescent lamp obtains continuing and stable supply power voltage, thereby realized wide voltage input.Because this driving power is non-isolated, so circuit structure is simpler, has reduced the cost of product.Simultaneously, PFC chip U1 has adopted high-precision QX9911 to drive chip, thereby has improved power factor and the conversion efficiency of this driving power.In addition, under the acting in conjunction of resistance R 6, diode D3 and resistance R 13, also improve the switching speed of metal-oxide-semiconductor Q1, made this driving power have reliability preferably.
In the present embodiment, in the peripheral circuit of described PFC chip U1, the output head anode of rectifier BD1 is by resistance R 1 and resistance R 2 positive pole that is connected to electrochemical capacitor C4 of series connection successively, the negative pole of electrochemical capacitor C4 is connected to power supply ground, rear end, the tie point of described resistance R 2 and electrochemical capacitor C4 links to each other with the power end VCC of PFC chip U1, the feedback end FB of PFC chip U1 is connected in the source electrode of metal-oxide-semiconductor Q1 by resistance R 3, its feedback end FB and error amplifier output Ctrl are connected to power supply ground, rear end by capacitor C 2 and capacitor C 3 respectively, its non-essential resistance end Rt is connected to power supply ground, rear end by resistance R 4, and its earth terminal GND is connected in power supply ground, rear end.
In the present embodiment, be connected with capacitor C 1 between the output head anode of described rectifier BD1 and the negative pole of output end, described capacitor C 1 is filter capacitor.But this is a preferred embodiment of the present utility model, be not limited to the utility model, in other embodiment of the present utility model, the output of described rectifier BD1 can also be crosstalked by the ripple in the filtering circuit by the filter of other types.
In the present embodiment; the centre cap of described inductance L 1 also connects the anode of diode D2; the negative electrode of diode D2 is connected to the power end VCC of PFC chip U1 by resistance R 5; when inductance L 1 centre tapped voltage is higher; this voltage can transfer to the power end VCC of PFC chip U1 by diode D2 and resistance R 5; avoid the impact of high voltage to zero current detection end ZCD, played protective effect.
The disclosed LED fluorescent lamp of the utility model is with in the non-isolation drive power supply, when higher or low when the input voltage of driving power, PFC chip U1 adjusts the duty ratio of the pulse-width signal of its output in real time according to sample rate current, the step of going forward side by side is put in order the duration that turns on and off of metal-oxide-semiconductor Q1, cooperate the anti-commendable increase of inductance L 1 and capacitor C 6 to press again, make that the LED fluorescent lamp obtains continuing and stable supply power voltage, thereby realized wide voltage input, and can satisfy the demand of different markets and country variant.Because this driving power is non-isolated, so circuit structure is simpler, has reduced the cost of product.Simultaneously, PFC chip U1 has adopted high-precision QX9911 to drive chip, so improved power factor and the conversion efficiency of this driving power.In addition, under the acting in conjunction of resistance R 6, diode D3 and resistance R 13, improve the switching speed of metal-oxide-semiconductor Q1, made this driving power have reliability preferably.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.

Claims (4)

1. a LED fluorescent lamp is with non-isolation drive power supply, it is characterized in that, described driving power includes a rectifier BD1, one disposes the PFC chip U1 of peripheral circuit, one metal-oxide-semiconductor Q1 and an inductance L 1, the chip model of described PFC chip U1 is QX9911, the input of described rectifier BD1 connects electrical network, its negative pole of output end connects front end power supply ground, its output head anode connects the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is by resistance R parallel with one another 9, resistance R 10 and resistance R 11 and be connected to power supply ground, rear end, the source electrode of this metal-oxide-semiconductor Q1 also connects the negative electrode of diode D1, the anode of diode D1 connects front end power supply ground, the pulse signal output end GD of described PFC chip U1 connects the negative electrode of diode D3, the anode of diode D3 connects the grid of metal-oxide-semiconductor Q1, described diode D3 is parallel with resistance R 6, the grid of metal-oxide-semiconductor Q1 also is connected to power supply ground, rear end by resistance R 13, the current sample end CS of described PFC chip U1 links to each other with the source electrode of metal-oxide-semiconductor Q1, its zero current detection end ZCD is by resistance R 7 and resistance R 8 centre cap that is connected to inductance L 1 of series connection successively, first end of described inductance L 1 connects power supply ground, rear end, its second end is connected to front end power supply ground by capacitor C parallel with one another 6 and resistance R 12, second end of described inductance L 1 is the output head anode of driving power, and described front end power supply ground is the negative pole of output end of driving power.
2. LED fluorescent lamp as claimed in claim 1 is with non-isolation drive power supply, it is characterized in that, in the peripheral circuit of described PFC chip U1, the output head anode of rectifier BD1 is by resistance R 1 and resistance R 2 positive pole that is connected to electrochemical capacitor C4 of series connection successively, the negative pole of electrochemical capacitor C4 is connected to power supply ground, rear end, the tie point of described resistance R 2 and electrochemical capacitor C4 links to each other with the power end VCC of PFC chip U1, the feedback end FB of PFC chip U1 is connected in the source electrode of metal-oxide-semiconductor Q1 by resistance R 3, its feedback end FB and error amplifier output Ctrl are connected to power supply ground, rear end by capacitor C 2 and capacitor C 3 respectively, its non-essential resistance end Rt is connected to power supply ground, rear end by resistance R 4, and its earth terminal GND is connected in power supply ground, rear end.
3. LED fluorescent lamp as claimed in claim 1 is characterized in that with non-isolation drive power supply, is connected with capacitor C 1 between the output head anode of described rectifier BD1 and the negative pole of output end, and described capacitor C 1 is filter capacitor.
4. LED fluorescent lamp as claimed in claim 1 is characterized in that with non-isolation drive power supply, and the centre cap of described inductance L 1 also connects the anode of diode D2, and the negative electrode of diode D2 is connected to the power end VCC of PFC chip U1 by resistance R 5.
CN2013201653843U 2013-04-03 2013-04-03 A non-isolated driving power supply used for a LED fluorescent lamp Expired - Fee Related CN203167377U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3051650A4 (en) * 2013-09-24 2016-08-24 Zte Corp Surge protection circuit for pfc circuit
CN105916242A (en) * 2016-05-19 2016-08-31 上海笙荣森电子有限公司 LED driving device with sub-ultrasonic remote control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3051650A4 (en) * 2013-09-24 2016-08-24 Zte Corp Surge protection circuit for pfc circuit
CN105916242A (en) * 2016-05-19 2016-08-31 上海笙荣森电子有限公司 LED driving device with sub-ultrasonic remote control

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Granted publication date: 20130828

Termination date: 20190403