CN212677423U - Low-cost LED removes stroboscopic control circuit and drive circuit system thereof - Google Patents

Low-cost LED removes stroboscopic control circuit and drive circuit system thereof Download PDF

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CN212677423U
CN212677423U CN202020414377.2U CN202020414377U CN212677423U CN 212677423 U CN212677423 U CN 212677423U CN 202020414377 U CN202020414377 U CN 202020414377U CN 212677423 U CN212677423 U CN 212677423U
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led
port
stroboscopic
control circuit
tube
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高耿辉
李昌
张传军
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DALIAN LIANSHUN ELECTRONICS CO LTD
Xiamen Yuanshun Microelectronics Technology Co ltd
Unisonic Technologies Co Ltd
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DALIAN LIANSHUN ELECTRONICS CO LTD
Xiamen Yuanshun Microelectronics Technology Co ltd
Unisonic Technologies Co Ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

The utility model relates to a low-cost LED removes stroboscopic control circuit and drive circuit system thereof, LED removes stroboscopic control circuit includes first resistance R1, second resistance R2, diode D1, first neat nanotube Z1 and second neat nanotube Z2; the utility model discloses can detect the drain voltage of external power NMOSFET pipe, remove the operating condition of stroboscopic electric capacity automatically regulated external power NMOSFET pipe through external VC port, make its work in the constant current district to get rid of the alternating current component in the LED electric current, reach and remove the stroboscopic purpose of LED. Meanwhile, the circuit adopts fewer devices to achieve the effect of removing stroboflash, the cost is greatly reduced, the port and power tube protection functions are integrated, high performance and high safety are achieved, and the use value and the economic value are better.

Description

Low-cost LED removes stroboscopic control circuit and drive circuit system thereof
Technical Field
The utility model relates to a power electronics field, especially a low-cost LED removes stroboscopic control circuit and drive circuit system thereof.
Background
At present, LED lighting has gone into thousands of households, and with the continuous development of LED technology, especially in recent years, intelligent lighting is very noisy, and people now pay attention not only to the lighting effect, but also begin to pay more attention to the photobiological safety problem of lighting.
Stroboscopic, a type of flicker that occurs due to frequency. The stroboscopic problem of the lighting product is often highlighted after additional functions such as dimming and communication are performed. The reason why the LED stroboscopic is generated is that the existing LED lamp is mainly applied by converting common alternating-current voltage into direct current or is used after the LED lamp is connected in series and boosted, but the voltage needs to be converted into direct current for use on the premise. The existing LED products need higher power factors, in order to improve the power factors of the products, the existing products adopt smaller filter capacitors to filter rectified currents after rectification and filtering, the filter capacitors are smaller, so that 100/120Hz envelope waves still exist in a rear-stage current output part, and when the LED lamps are lightened, the LED lamps can still be observed through a camera or a mobile phone, and the interference strips which can move quickly can still be found. The LED stroboscopic has stimulation effect on the visual system of people, and can generate uncomfortable feeling. At present, in order to solve the problem of LED stroboflash, a scheme of adding a post-stage filter capacitor, a scheme of adding a DC-DC conversion circuit and a scheme of adopting a complex stroboflash removal circuit are adopted. However, due to the limitation of product size and cost, a low-cost and simple LED stroboscopic removal control scheme without a large post-stage filter capacitor, a DC-DC conversion circuit and a complex stroboscopic removal control circuit is urgently needed. Fig. 1 shows a conventional LED driving system, in which the current ripple of the LED load is large, and fig. 2 shows a waveform diagram of related signals of the conventional LED driving circuit system. The utility model discloses a low-cost LED removes stroboscopic control circuit, the circuit is retrencied, and it unites external power NMOSFET, VC port to remove the stroboscopic control scheme that removes that stroboscopic capacitor and LED driver, output capacitance constitute, can eliminate the stroboscopic problem that exists among the traditional LED drive circuit system.
Disclosure of Invention
In view of this, the present invention provides a low-cost LED stroboscopic-removing control circuit and a driving circuit system thereof, which can achieve the purpose of removing stroboscopic light of LEDs by using few control circuits, and can greatly reduce the current ripple of LEDs; and the circuit is simplified, and the built-in port and the external power tube are protected, so that the design and production cost and the device cost of a downstream application end are effectively reduced.
The utility model discloses a following scheme realizes: a low-cost LED stroboscopic-removing control circuit comprises a first resistor R1, a second resistor R2, a diode D1, a first Zener tube Z1 and a second Zener tube Z2; one end of the first resistor R1 is connected with the anode of the diode D1 and serves as a first port D; the other end of the first resistor R1 is respectively connected with one end of the first Zener diode Z1 and one end of the second resistor R2 and serves as a third port VC; the cathode of the diode D1 is connected to the other end of the first zener diode Z1 and serves as a fifth port VT; the other end of the second resistor R2 is connected with one end of the second Zener diode Z2 and serves as a fourth port G; the other end of the second Zener pipe Z2 is used as a second port S.
Further, the utility model also provides an use low-cost LED to remove LED drive circuit system of stroboscopic control circuit, including LED driver, output capacitance Co, LED remove stroboscopic control circuit, remove ripple condenser C1, external power NMOSFET pipe and LED load; the input end of the LED driver is externally connected with a power supply, and one output end of the LED driver is respectively connected with one end of the output capacitor Co and the anode of the LED load; a first port D of the LED stroboscopic-removing control circuit is respectively connected with the cathode of the LED load and the drain electrode of the power NMOSFET tube; a third port VC (capacitive) port of the LED stroboscopic-removing control circuit is connected with one end of the ripple-removing capacitor C1; the five-port VT of the LED stroboscopic-removing control circuit is suspended or externally connected with a voltage limiting circuit and used for limiting the voltage of a first port D so as to prevent the power NMOSFET tube from being burnt due to the short circuit of an LED load; a fourth port G of the LED stroboscopic-removing control circuit is connected with a grid electrode of the power NMOSFET tube; and the other output end of the LED driver is connected with the other end of the output capacitor Co, the second port S of the LED stroboscopic-removing control circuit, the source electrode of the power NMOSFET tube and the other end of the ripple-removing capacitor C1 and is grounded.
Further, the applicable frequency of the stroboscopic removing control circuit is 100/120 Hz.
Further, the model of the LED driver is ULF 0291.
Further, the LED load comprises more than one light emitting diode, and the light emitting diodes are mutually connected in series.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses the circuit is retrencied, has adopted very little control circuit to reach LED promptly and has removed stroboscopic purpose, and integrated port and power tube protect function simultaneously, the functional, design and manufacturing cost reduce by a wide margin, have better use value and economic value.
Drawings
Fig. 1 is a schematic diagram of a conventional LED driving circuit system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of waveforms of signals related to a conventional LED driving circuit system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a LED stroboscopic-removing control circuit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an LED driving circuit system according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of waveforms of signals related to the LED driving circuit system according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 3, the present embodiment provides a low-cost LED stroboscopic-free control circuit, which includes a first resistor R1, a second resistor R2, a diode D1, a first zener diode Z1, and a second zener diode Z2; one end of the first resistor R1 is connected with the anode of the diode D1 and serves as a first port D; the other end of the first resistor R1 is respectively connected with one end of the first Zener diode Z1 and one end of the second resistor R2 and serves as a third port VC; the cathode of the diode D1 is connected to the other end of the first zener diode Z1 and serves as a fifth port VT; the other end of the second resistor R2 is connected with one end of the second Zener diode Z2 and serves as a fourth port G; the other end of the second Zener pipe Z2 is used as a second port S.
As shown in fig. 4, preferably, the present embodiment further provides an LED driving circuit system using a low-cost LED stroboscopic removal control circuit, which includes an LED driver, an output capacitor Co, an LED stroboscopic removal control circuit, a ripple removal capacitor C1, an external power NMOSFET and an LED load; the input end of the LED driver is externally connected with a power supply, and one output end of the LED driver is respectively connected with one end of the output capacitor Co and the anode of the LED load; a first port D of the LED stroboscopic-removing control circuit is respectively connected with the cathode of the LED load and the drain electrode of the power NMOSFET tube; a third port VC (capacitive) port of the LED stroboscopic-removing control circuit is connected with one end of the ripple-removing capacitor C1; the five-port VT of the LED stroboscopic-removing control circuit is suspended or externally connected with a voltage limiting circuit and used for limiting the voltage of a first port D so as to prevent the power NMOSFET tube from being burnt due to the short circuit of an LED load; a fourth port G of the LED stroboscopic-removing control circuit is connected with a grid electrode of the power NMOSFET tube; and the other output end of the LED driver is connected with the other end of the output capacitor Co, the second port S of the LED stroboscopic-removing control circuit, the source electrode of the power NMOSFET tube and the other end of the ripple-removing capacitor C1 and is grounded.
In this embodiment, the applicable frequency of the stroboscopic-removing control circuit is 100/120 Hz.
In the present embodiment, the model of the LED driver is ULF 0291.
In this embodiment, the LED load includes more than one light emitting diode, and the light emitting diodes are connected in series with each other.
Preferably, in this embodiment, the first port D is used for connecting a drain of an external power NMOSFET; the third port VC is externally connected with a ripple removing capacitor C1; the fifth port VT is used for detecting the drain voltage of the power NMOSFET so as to realize the limitation of the drain voltage of the external power NMOSFET; the fourth port G is used for outputting the gate driving voltage of the power NMOSFET; and the second port S is used for connecting the source electrode of the power NMOSFET.
According to the detected voltage of the D port, the voltage of the G port can be automatically adjusted through the ripple removing capacitor C1 externally connected with the VC port, so that the V of the external power NMOSFETGSAnd keeping the working state of the power NMOSFET constant, so that the aims of removing the alternating current component of the LED current flowing through the power NMOSFET and removing the LED stroboscopic effect are fulfilled. Meanwhile, the first Zener diode Z1, the second Zener diode Z2 and the second resistor R2 can limit the voltage difference and the current between the related ports so as to prevent the instantaneous high voltage from damaging the power NMOSFET. The method comprises the following specific steps: the second Zener diode Z2 can limit the V of the power NMOSFETGSA voltage; the first Zener pipe Z1 can limit the pressure difference between the D port and the VC port; the first,The second Zener transistors Z1 and Z2 and the second resistor R2 can limit the V of the power NMOSFET tubeDSVoltage, and the value of a through current flowing through the D, S port in an abnormal state can be limited, so that the LED stroboscopic-removing control circuit is prevented from being burnt; the VT port can be externally connected with a protection circuit to limit the drain voltage of the power NMOSFET tube, and can also be suspended without use.
Preferably, in this embodiment, the LED current with the ac component generated by the LED driver passes through the stroboscopic removing control circuit and the power NMOSFET, and the stroboscopic removing control circuit can automatically adjust the voltage at the G port through the ripple capacitor C1 of the external VC port, so that the V of the external power NMOSFET is enabled to be VGSAnd the working state of the power NMOSFET is constant, so that the working state of the power NMOSFET is in a constant current region, the alternating current component of the LED current flowing through the power NMOSFET is removed, and the aim of removing LED stroboscopic is fulfilled.
Preferably, in this embodiment, the purpose of LED stroboscopic removal is achieved by using few stroboscopic removal control circuits, and a port and a power tube protection mechanism are built in.
Preferably, in order to make the skilled person better understand the present embodiment, the following further describes the working principle of the present embodiment with reference to the circuit:
and the LED current with alternating current components, which is generated by the LED drive and filtered by the output capacitor Co, passes through the power NMOSFET tube. The D port of the LED stroboscopic removal control circuit detects the voltage fluctuation of the drain terminal of the power NMOSFET tube, and the voltage of the G port is automatically adjusted by the stroboscopic removal capacitor C1 through combining the external VC port of the stroboscopic removal control circuit, so that the stroboscopic removal capacitor C1 is constant, and the specific value is as follows:
VG＝VComin+ΔVCo/2 ①
wherein, VCominIs the lower limit value of the voltage fluctuation, DeltaV, at the output capacitor CoCoIs the voltage fluctuation amount at the output capacitor Co.
The source electrode of the power NMOSFET tube is grounded, so that the grid source voltage V of the power NMOSFET tube is at the momentGSIs constant.
In order to make the power NMOSFET transistor operate in the constant current region, the following conditions need to be satisfied:
VDS≥VGS-Vth ②
obviously, VDSminThe method comprises the following steps:
VDS min≥VGS-Vth
③
wherein, VDSIs the drain-source voltage, V, of the power NMOSFET tubeDS minIs the minimum drain-source voltage, V, of the power NMOSFET tubeGSIs the gate-source voltage, V, of the power NMOSFET tubethThe threshold voltage of the power NMOSFET tube is obtained.
Because the source electrode of the power NMOSFET tube is grounded, the following components are provided:
VDS min＝VComin ④
VGS＝V G ⑤
the fifth step is carried over into the fifth step, then:
VGS＝VDS min+ΔVCo/2
⑥
will be taken into (C), then there will be:
VDS min≥VDSmin+ΔVCo/2-Vth ⑦
obtaining:
ΔVCo≤2Vth ⑧
and the eighthly is the condition for finally enabling the power NMOSFET tube to work in the constant current area.
To satisfy the condition, the voltage fluctuation at the output capacitor Co can be suppressed by adjusting the R1 resistor in the LED stroboscopic control circuit and the value of the stroboscopic removing capacitor C1 externally connected to the VC port of the stroboscopic removing control circuit. The R1 resistor and the C1 constitute a low pass filter, since the applicable frequency of the stroboscopic removal control scheme is 100/120Hz, and considering that a certain margin is left, a cut-off frequency can be set as:
Figure DEST_PATH_GDA0002866427580000081
through the arrangement, a solution applying the low-cost LED stroboscopic removing control circuit can be realized.
In addition, the Zener tubes Z1 and Z2 and the resistor R2 in the stroboscopic removing control circuit can limit the voltage difference and current between the related ports so as to prevent the instantaneous high voltage from damaging the power NMOSFET tube. The method comprises the following specific steps: the Zener tube Z2 can limit the V of the power NMOSFET tubeGSVoltage when said VGSWhen the voltage is overhigh, the Zener tube Z2 is conducted to limit the VGSThe voltage rises further; similarly, the Zener pipe Z1 can limit the pressure difference between the D port and the VC port; the Zener transistors Z1 and Z2 and the resistor R2 can limit the V of the power NMOSFETDSAnd voltage, and the value of a through current flowing through the D, S port in an abnormal state can be limited, so that the stroboscopic removing control circuit is prevented from being burnt.
Moreover, the VT port in the stroboscopic-removing control circuit may be externally connected with a protection circuit to limit the drain voltage of the power NMOSFET transistor, or may be suspended and not used.
The utility model provides a pair of low-cost LED removes stroboscopic control circuit, the circuit is retrencied, and it unites external power NMOSFET, VC port to remove the stroboscopic control scheme that removes that stroboscopic capacitor and LED driver, output capacitance constitute, can get rid of the stroboscopic problem that exists among the traditional LED drive circuit system.
As shown in fig. 5, for adopting the LED driving circuit system of the present invention, the related signal waveform diagram realizes the function of removing the strobe.
It is worth mentioning that the utility model protects a hardware structure, as for the control method does not require protection. The above is only a preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments, and any equivalent changes and modifications made according to the present invention do not exceed the scope of the present invention, and all belong to the protection scope of the present invention.

Claims (5)

1. The utility model provides a low-cost LED removes stroboscopic control circuit which characterized in that: the high-power-consumption Zener diode comprises a first resistor R1, a second resistor R2, a diode D1, a first Zener diode Z1 and a second Zener diode Z2; one end of the first resistor R1 is connected with the anode of the diode D1 and serves as a first port D; the other end of the first resistor R1 is respectively connected with one end of the first Zener diode Z1 and one end of the second resistor R2 and serves as a third port VC; the cathode of the diode D1 is connected to the other end of the first zener diode Z1 and serves as a fifth port VT; the other end of the second resistor R2 is connected with one end of the second Zener diode Z2 and serves as a fourth port G; the other end of the second Zener pipe Z2 is used as a second port S.
2. An LED driving circuit system using the low-cost LED stroboscopic removal control circuit of claim 1, wherein: the LED stroboscopic control circuit comprises an LED driver, an output capacitor Co, an LED stroboscopic-removing control circuit, a ripple-removing capacitor C1, an external power NMOSFET tube and an LED load; the input end of the LED driver is externally connected with a power supply, and one output end of the LED driver is respectively connected with one end of the output capacitor Co and the anode of the LED load; a first port D of the LED stroboscopic-removing control circuit is respectively connected with the cathode of the LED load and the drain electrode of the power NMOSFET tube; a third port VC (capacitive) port of the LED stroboscopic-removing control circuit is connected with one end of the ripple-removing capacitor C1; the five-port VT of the LED stroboscopic-removing control circuit is suspended or externally connected with a voltage limiting circuit and used for limiting the voltage of a first port D so as to prevent the power NMOSFET tube from being burnt due to the short circuit of an LED load; a fourth port G of the LED stroboscopic-removing control circuit is connected with a grid electrode of the power NMOSFET tube; and the other output end of the LED driver is connected with the other end of the output capacitor Co, the second port S of the LED stroboscopic-removing control circuit, the source electrode of the power NMOSFET tube and the other end of the ripple-removing capacitor C1 and is grounded.
3. The LED driving circuit system of claim 2, wherein the LED driving circuit system comprises: the applicable frequency of the LED stroboscopic-removing control circuit is 100/120 Hz.
4. The LED driving circuit system of claim 2, wherein the LED driving circuit system comprises: the LED driver is ULF 0291.
5. The LED driving circuit system of claim 2, wherein the LED driving circuit system comprises: the LED load comprises more than one light emitting diode, and the light emitting diodes are connected in series.
CN202020414377.2U 2020-03-27 2020-03-27 Low-cost LED removes stroboscopic control circuit and drive circuit system thereof Active CN212677423U (en)

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