CN210536989U - LED drive circuit with little night-light function - Google Patents
LED drive circuit with little night-light function Download PDFInfo
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- CN210536989U CN210536989U CN201921284322.8U CN201921284322U CN210536989U CN 210536989 U CN210536989 U CN 210536989U CN 201921284322 U CN201921284322 U CN 201921284322U CN 210536989 U CN210536989 U CN 210536989U
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Abstract
The utility model relates to the technical field of LED lighting circuits, in particular to an LED driving circuit with a small night lamp function, which comprises a power input unit, a rectifying unit, a switch detection unit, a constant current unit and a switching unit, wherein the output end of the power input unit is connected with the input end of the rectifying unit; the output end of the rectifying unit is respectively connected with the input end of the switch detection unit and the input end of the constant current unit; the output end of the switch detection unit and the output end of the constant current unit are respectively connected with the switching unit; the switch detection unit detects a switch signal and outputs the signal to the switching unit, and the switching unit controls the switching of the small night lamp or the main lamp according to the received signal. The utility model discloses a single constant current drive unit has reduced the volume, the cost is reduced, is fit for small-size LED lamp, and this drive circuit still compatible TRIAC function of adjusting luminance simultaneously.
Description
Technical Field
The utility model relates to a LED lighting circuit technical field, concretely relates to LED drive circuit with little night-light function.
Background
The conventional LED lamp does not have the function of a small night lamp generally, can only be used as conventional illumination, and cannot meet the auxiliary illumination requirement of a user on night sleep time. For this reason, there has been the company to design the LED lamp that has little night-light function, and switch over the use through drive power supply two kinds of operating modes, like Chinese patent a take little night-light function cut looks dimming LED circuit (patent number 201710452104.X), a drive circuit that can realize ordinary illumination, little night-light function and dimming function merge is disclosed, including input rectifier circuit, switch detection control circuit, little night-light drive circuit, little night-light auxiliary circuit and main drive circuit, input rectifier circuit's output is the input of connecting switch detection control circuit and main drive circuit respectively, little night-light drive circuit and little night-light auxiliary circuit's input is connected respectively to switch detection control circuit's output, little night-light auxiliary circuit's output connection main drive circuit. Input rectifier circuit converts alternating current signal into direct current signal and for switch detection control circuit and main drive circuit power supply, switch detection control circuit real-time detection switch open and shut signal number of times and produce corresponding control signal in order to drive little night-light drive circuit, little night-light auxiliary circuit and main drive circuit, little night-light drive circuit drives little night-light work, little night-light auxiliary circuit adjusts operating current in real time, main drive circuit drives main illumination work and adjusts the luminance of main light. If a chinese patent again (patent No. 201720493004.7), an LED drive power supply that can freely switch little night-light and main illumination is disclosed, including the power input end, EMI filter power supply circuit unit, the rectifier circuit unit, the switching circuit unit, first step-down constant current circuit unit and second step-down constant current circuit unit, EMI filter power supply circuit unit is connected with the power input end, the rectifier circuit unit is connected with EMI filter power supply circuit unit, the switching circuit unit is connected with the rectifier circuit unit, first step-down constant current circuit unit and second step-down constant current circuit unit are connected with the switching circuit unit respectively, main illumination circuit unit connects first step-down constant current circuit unit, little night-light illumination circuit unit connects second step-down constant current circuit unit. The switching circuit unit is used for collecting power grid switching signals and outputting different control signals to the first voltage reduction constant current circuit unit and the second voltage reduction constant current circuit unit, so that the main lighting circuit unit or the small night lamp lighting circuit unit is controlled to be lightened.
However, the two driving power supplies respectively use two driving circuits to respectively control and light the small night lamp and the main illuminating lamp, so that the manufacturing cost is high, and the driving power supply is large in size and difficult to accommodate in the small-size LED lamp.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a LED drive circuit with little night-light function to solve the technical problem who mentions in the background art.
To achieve the above object, the present invention provides the following technical solutions: an LED drive circuit with a small night lamp function comprises a power input unit, a rectifying unit, a switch detection unit, a constant current unit and a switching unit; wherein: the input end of the power input unit is connected with commercial alternating current, and the output end of the power input unit is connected with the input end of the rectification unit; the output end of the rectifying unit is respectively connected with the input end of the switch detection unit and the input end of the constant current unit, and the rectifying unit converts the alternating current signal into a direct current signal and supplies power to the driving circuit; the output end of the switch detection unit and the output end of the constant current unit are respectively connected with the switching unit, the switch detection unit detects opening and closing signals of the switch in real time and transmits the signals to the switching unit, the switching unit controls the switching of the small night lamp or the main lamp according to the received signals, and the constant current unit provides constant direct current for the small night lamp or the main lamp.
Furthermore, the power input unit comprises a switch, a fuse resistor and a voltage dependent resistor, wherein the switch and the fuse resistor are connected in series on the live wire, and the voltage dependent resistor is connected in parallel between the live wire and the zero wire; the switch is connected with a TRIAC dimmer.
Furthermore, the rectifier unit comprises a rectifier bridge and a diode, two input ends of the rectifier bridge are connected with the output end of the power input unit, one output end of the rectifier bridge is respectively connected with the anode of the diode, the input end of the switch detection unit and the input end of the TRIAC dimmer for detecting and maintaining current, and the other output end of the rectifier bridge is grounded; the cathode of the diode is respectively connected with the input end of the constant current unit, the anode of the small night lamp and the anode of the main lamp.
Further, the constant current unit comprises a constant current control chip, a first resistor, a second resistor, a third resistor, a first sampling resistor, a second sampling resistor and an electrolytic capacitor; the constant current control chip is provided with nine pins, a first pin of the constant current control chip is connected with the output end of the rectifier bridge through a first resistor, a second pin of the constant current control chip is connected with the cathode of the diode, a third pin of the constant current control chip is grounded through a first sampling resistor and a second sampling resistor, a fourth pin of the constant current control chip is grounded through a second sampling resistor, a fifth pin and a ninth pin of the constant current control chip are grounded respectively, a sixth pin of the constant current control chip is grounded through a third resistor, a seventh pin of the constant current control chip is connected with the cathode of the electrolytic capacitor, an eighth pin of the constant current control chip is connected with the output end of the rectifier bridge through a second resistor, and the anode of the electrolytic capacitor is connected with the cathode of the diode.
Further, the switching unit comprises a switch switching chip, a boosting device, a sixth resistor and a first capacitor; the switch switches and is equipped with eight pins on the chip, the first pin that the chip was switched in the switch passes through the positive pole of sixth resistance and main lamp to be connected, the second pin that the chip was switched in the switch is connected with switch detecting element, the third pin that the chip was switched in the switch passes through first electric capacity and is connected with the fourth pin that the chip was switched in the switch, the fourth pin that the chip was switched in the switch is connected with the seventh pin of constant current control chip, the fifth pin that the chip was switched in the switch and the sixth pin that the chip was switched in the switch are connected, the fifth pin that the chip was switched in the switch and the sixth pin pass through the booster device and are connected with the negative pole of little night-light, the seventh pin and the eighth pin that the chip was switched in the.
Furthermore, the boosting device is one of a resistor device, a voltage stabilizing diode, an LED lamp bead, a constant current tube and a discrete device.
Preferably, when the voltage boosting device is a resistor device, the resistor device includes a fourth resistor and a fifth resistor connected in parallel, one common terminal of the fourth resistor and the fifth resistor is connected to the negative electrode of the small night lamp, and the other common terminal is connected to the fifth pin and the sixth pin of the switching chip.
Preferably, when the voltage boost device is a discrete device, the discrete device includes a second zener diode, a ninth resistor, and a first triode, a collector of the first triode is connected to a negative electrode of the small night light and one end of the ninth resistor, a base of the first triode is connected to a negative electrode of the ninth resistor and a negative electrode of the second zener diode, an anode of the second zener diode is grounded, and an emitter of the first triode is connected to a fifth pin and a sixth pin of the switching chip.
Further, the switch detection unit comprises a seventh resistor, an eighth resistor and a second capacitor; one end of the seventh resistor is connected with one output end of the rectifier bridge, the other end of the seventh resistor is connected with one end of the eighth resistor and the second pin of the switch switching chip respectively, the other end of the eighth resistor is connected with the fourth pin of the switch switching chip and one end of the first capacitor respectively, the other end of the first capacitor is connected with the third pin of the switch switching chip, and the second capacitor is connected at two ends of the eighth resistor in parallel.
Further, the small night lamp and the main lamp use independent light sources respectively, or use the same light source.
Compared with the prior art, the utility model, its beneficial effect lies in: the utility model relates to a LED drive circuit with little night-light function adopts single constant current drive unit, detects switching signal and with signal output to the switching unit through switch detecting element, and the break-make through different MOS pipes in the switch switching chip makes main lamp or little night-light on, owing to only used a constant current drive, consequently the volume is less, and the cost is also lower, is fit for the LED lamp of little volume, and this drive circuit is compatible TRIAC dimming function still simultaneously.
Drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Fig. 3 is a circuit diagram of the voltage regulator diode used in the voltage boost device of the present invention.
Fig. 4 is the utility model discloses well pressure boost device adopts the circuit diagram of LED lamp pearl.
Fig. 5 is a circuit diagram of the constant current tube used in the voltage boosting device of the present invention.
Fig. 6 is a circuit diagram of the discrete device used in the voltage boosting device of the present invention.
Fig. 7 is a circuit diagram of the same light source shared by the small night lamp and the main lamp of the middle switching unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.
Example (b): an LED drive circuit with a small night lamp function is shown in figures 1-2 and comprises a power supply input unit, a rectifying unit, a switch detection unit, a constant current unit and a switching unit; the input end of the power input unit is connected with commercial alternating current, and the output end of the power input unit is connected with the input end of the rectification unit; the output end of the rectifying unit is respectively connected with the input end of the switch detection unit and the input end of the constant current unit; the output end of the switch detection unit and the output end of the constant current unit are respectively connected with the switching unit.
In the structure, the power input unit receives alternating current commercial power from a power grid, the rectifying unit rectifies the alternating current commercial power into direct current, the switch detection unit detects signals of the switch in real time and transmits the signals to the switching unit, the switching unit controls the switch of the small night lamp or the main lamp according to the received signals, and the constant current unit can provide constant direct current for the small night lamp or the main lamp.
The power input unit comprises a switch, a fuse resistor F and a piezoresistor RV 1; the switch and the fuse resistor F are connected in series on the live wire, and the piezoresistor RV1 is connected in parallel between the live wire and the zero wire; the switch can be a switch with a TRIAC dimmer, or can be installed separately from the TRIAC dimmer; the constant current unit can provide constant direct current for a small night lamp or a main lamp, and meanwhile, can also provide a maintaining current for a TRIAC dimmer when the TRIAC dimmer conducts dimming.
The rectifying unit comprises a rectifying bridge BD1 and a diode D1, two input ends of the rectifying bridge BD1 are connected with the output end of the input unit, one output end of the rectifying bridge BD1 is respectively connected with the anode of the diode D1, the input end of the switch detection unit and the input end of the TRIAC dimmer for detecting and maintaining current, and the other output end of the rectifying bridge BD1 is grounded; the cathode of the diode D1 is respectively connected with the input end of the constant current unit, the anode of the small night lamp and the anode of the main lamp. The rectifier bridge BD1 can rectify the commercial alternating current input into direct current, the diode D1 is a fast recovery diode, and the diode D1 is added to enable the constant current control chip to rapidly detect the waveform output by the rectifier bridge BD1, so that whether TRIAC dimming and switching states exist or not can be rapidly judged.
The constant current unit comprises a constant current control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a first sampling resistor RS1, a second sampling resistor RS2 and an electrolytic capacitor CD.
Nine pins are arranged on the constant current control chip U1; a first pin of the constant current control chip U1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with the output end of the rectifier bridge BD 1; a second pin of the constant current control chip U1 is connected with the cathode of the diode D1; a third pin of the constant current control chip U1 is connected with one end of a first sampling resistor RS1, the other end of the first sampling resistor RS1 is respectively connected with a fourth pin of the constant current control chip U1 and one end of a second sampling resistor RS2, and the other end of the second sampling resistor RS2 is grounded; the fifth pin of the constant current control chip U1 is grounded; a sixth pin of the constant current control chip U1 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is grounded; a seventh pin of the constant current control chip U1 is connected with the negative electrode of the electrolytic capacitor CD; an eighth pin of the constant current control chip U1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with the output end of the rectifier bridge BD 1; the ninth pin of the constant current control chip U1 is connected to ground. The anode of the electrolytic capacitor CD is connected to the cathode of the diode D1.
Among the pins of the constant current control chip U1, the second pin of the constant current control chip U1 is a power supply pin of the constant current control chip U1, and supplies power supply voltage to the constant current control chip U1 to enable the chip to normally operate; the first pin of the constant current control chip U1 is a detection pin of the TRIAC dimmer, when the TRIAC dimmer conducts dimming, the rectifier bridge BD1 supplies a maintaining current to the TRIAC dimmer through the second resistor R2, the constant current control chip U1, the first sampling resistor RS1 and the second sampling resistor RS2, and when the TRIAC dimmer does not conduct dimming, the eighth pin of the constant current control chip U1 does not work; a third pin and a fourth pin of the constant current control chip U1 are sampling resistor connection pins, and the magnitude of output current is controlled through a sampling resistor; the sixth pin of the constant current control chip U1 is a temperature protection pin, and the current of the chip is adjusted by controlling the voltage at two ends of the third resistor R3 under different temperatures, so that the chip is prevented from being burned out when the temperature is too high; the seventh pin of the constant current control chip U1 is the drain terminal of the MOS transistor of the chip, the fifth pin of the constant current control chip U1 is the compensation pin of the constant current control chip U1, and the ninth pin of the constant current control chip U1 is the ground terminal of the chip. The constant current unit can adopt a linear constant current circuit and can also adopt other constant current circuits.
The switching unit includes a switching chip U2, a boosting device, a sixth resistor R6, and a first capacitor C1.
Eight pins are arranged on the switch switching chip U2, a first pin of the switch switching chip U2 is connected with one end of a sixth resistor R6, and the other end of the sixth resistor R6 is connected with the anode of the main lamp; a second pin of the switch switching chip U2 is connected with the switch detection unit; a third pin of the switch switching chip U2 is connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is connected to an eighth resistor R8 and a fourth pin of the switch switching chip U2, respectively; the fourth pin of the switch switching chip U2 is connected with the seventh pin of the constant current control chip U1; a fifth pin and a sixth pin of the switch switching chip U2 are respectively connected with one end of a voltage booster, the other end of the voltage booster is connected with the cathode of the small night lamp, and the anode of the small night lamp is connected with the cathode of the rectifying unit diode D1; the seventh pin and the eighth pin of the switch switching chip U2 are connected to the negative electrode of the main lamp, and the positive electrode of the main lamp is connected to the negative electrode of the rectifying unit diode D1.
Among the pins of the switch switching chip U2, the first pin of the switch switching chip U2 is a power supply pin of the chip, and the sixth resistor R6 supplies power supply voltage to the switch switching chip U2 to enable the switch switching chip U2 to normally operate; a second pin of the switch switching chip U2 is a switch detection pin, and a signal of the switching times detected by the switch detection unit is input to the chip; a third pin of the switch switching chip U2 is an output pin, and smooth direct current is obtained through the first capacitor C1; a fourth pin of the switch switching chip U2 is a grounding pin; a fifth pin and a sixth pin of the switch switching chip U2 are input pins of a first MOS transistor in the switch switching chip U2, and are used for controlling the on and off of the first MOS transistor; the seventh pin and the eighth pin of the switch switching chip U2 are input pins of a second MOS transistor in the chip, and are used for controlling the on and off of the second MOS transistor.
In order to reduce the output current in the small night lamp circuit and achieve the illumination effect of the small night lamp, a voltage boosting device needs to be added between the small night lamp and the fifth pin and the sixth pin of the switch switching chip U2 to increase the voltage in the small night lamp circuit, so that the current flowing through the small night lamp is reduced; the voltage boosting device in this embodiment may be one of a resistor device, a zener diode, an LED lamp bead, a constant current tube, and a discrete device, as shown in fig. 2 to 6, respectively.
When the voltage boosting device is a resistor device, as shown in fig. 2, the resistor device includes a fourth resistor R4 and a fifth resistor R5 connected in parallel, one common terminal of the fourth resistor R4 and the fifth resistor R5 is connected to the negative electrode of the small night light, and the other common terminal is connected to the fifth pin and the sixth pin of the switching chip U2.
When the voltage boost device adopts a discrete device, as shown in fig. 6, the discrete device includes a second zener diode ZD2, a ninth resistor R9, and a first triode Q1, a collector of the first triode Q1 is connected to a negative electrode of the small night lamp and one end of the ninth resistor R9, a base of the first triode Q1 is connected to the other end of the ninth resistor R9 and a negative electrode of the second zener diode ZD2, an anode of the second zener diode ZD2 is grounded, and an emitter of the first triode Q1 is connected to a fifth pin and a sixth pin of the switching chip U2.
The switch detection unit includes a seventh resistor R7, an eighth resistor R8, and a second capacitor C2. One end of the seventh resistor R7 is connected with one output end of the rectifier bridge BD1, and the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the second pin of the switch switching chip U2 respectively; the other end of the eighth resistor R8 is connected to the fourth pin of the switch switching chip U2 and one end of the first capacitor C1, respectively, the other end of the first capacitor C1 is connected to the third pin of the switch switching chip U2, and the second capacitor C2 is connected in parallel to the two ends of the eighth resistor R8. The switch detection unit detects a switch signal in real time and outputs the signal to the switching unit, and the small night lamp or the main lamp is lightened through the switch switching chip U2.
In specific implementation of this embodiment, when the switch is closed for the first time, the switch detection unit outputs a switch signal to the switch switching chip U2, the first MOS transistor in the switch switching chip U2 is turned off, the second MOS transistor is turned on, and the circuit turns on the main lamp after passing through the input unit, the rectifying unit, the switching unit, and the constant current unit; when the quick second closure that carries on of switch, switch detecting element exports switching signal to switch switching chip U2, and the first MOS pipe in the switch switching chip U2 switches on this moment, and the second MOS pipe is closed, and the circuit makes little night-light on after input unit, rectifier unit, switching unit and the constant current unit. If the main lamp or the small night lamp needs to be dimmed by the TRAIC dimmer, the circuit supplies a maintaining current to the TRIAC dimmer through the rectifier bridge BD1, the second resistor R2, the constant current control chip U1, the first sampling resistor RS1 and the second sampling resistor RS2, so that the dimmer can normally dim.
Additionally, the utility model discloses an in the above-mentioned embodiment little night-light and main lamp are equallyd divide and are do not used independent light source separately, also can use the same light source in fact, for example sharing LED lamp pearl, as shown in fig. 7, the positive pole of sharing LED lamp pearl is connected with diode D1's negative pole and sixth resistance R6's one end respectively, and the negative pole of sharing LED lamp pearl is connected with the one end of pressure boost device and switch switching chip U2's seventh pin, eighth pin respectively.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. An LED drive circuit with a small night lamp function is characterized by comprising a power input unit, a rectifying unit, a switch detection unit, a constant current unit and a switching unit; wherein:
the input end of the power input unit is connected with commercial alternating current, and the output end of the power input unit is connected with the input end of the rectification unit;
the output end of the rectifying unit is respectively connected with the input end of the switch detection unit and the input end of the constant current unit, and the rectifying unit converts the alternating current signal into a direct current signal and supplies power to the driving circuit;
the output end of the switch detection unit and the output end of the constant current unit are respectively connected with the switching unit, the switch detection unit detects opening and closing signals of the switch in real time and transmits the signals to the switching unit, the switching unit controls the switching of the small night lamp or the main lamp according to the received signals, and the constant current unit provides constant direct current for the small night lamp or the main lamp.
2. The LED driving circuit with the function of the small night lamp as claimed in claim 1, wherein the power input unit comprises a switch, a fuse resistor and a voltage dependent resistor, the switch and the fuse resistor are connected in series with the live wire, and the voltage dependent resistor is connected in parallel between the live wire and the neutral wire; the switch is connected with a TRIAC dimmer.
3. The LED driving circuit with a night light function as claimed in claim 2, wherein the rectifying unit comprises a rectifying bridge and a diode, two input terminals of the rectifying bridge are connected to the output terminal of the power input unit, one of the output terminals of the rectifying bridge is respectively connected to the anode of the diode, the input terminal of the switch detection unit and the input terminal of the TRIAC dimmer for detecting and maintaining current, and the other output terminal is grounded; the cathode of the diode is respectively connected with the input end of the constant current unit, the anode of the small night lamp and the anode of the main lamp.
4. The LED driving circuit with the function of a small night light as claimed in claim 3, wherein the constant current unit comprises a constant current control chip, a first resistor, a second resistor, a third resistor, a first sampling resistor, a second sampling resistor and an electrolytic capacitor; the constant current control chip is provided with nine pins, a first pin of the constant current control chip is connected with the output end of the rectifier bridge through a first resistor, a second pin of the constant current control chip is connected with the cathode of the diode, a third pin of the constant current control chip is grounded through a first sampling resistor and a second sampling resistor, a fourth pin of the constant current control chip is grounded through a second sampling resistor, a fifth pin and a ninth pin of the constant current control chip are grounded respectively, a sixth pin of the constant current control chip is grounded through a third resistor, a seventh pin of the constant current control chip is connected with the cathode of the electrolytic capacitor, an eighth pin of the constant current control chip is connected with the output end of the rectifier bridge through a second resistor, and the anode of the electrolytic capacitor is connected with the cathode of the diode.
5. The LED driving circuit with the function of the night light as claimed in claim 4, wherein the switching unit comprises a switch switching chip, a voltage boosting device, a sixth resistor and a first capacitor; the switch switches and is equipped with eight pins on the chip, the first pin that the chip was switched in the switch passes through the positive pole of sixth resistance and main lamp to be connected, the second pin that the chip was switched in the switch is connected with switch detecting element, the third pin that the chip was switched in the switch passes through first electric capacity and is connected with the fourth pin that the chip was switched in the switch, the fourth pin that the chip was switched in the switch is connected with the seventh pin of constant current control chip, the fifth pin that the chip was switched in the switch and the sixth pin that the chip was switched in the switch are connected, the fifth pin that the chip was switched in the switch and the sixth pin pass through the booster device and are connected with the negative pole of little night-light, the seventh pin and the eighth pin that the chip was switched in the.
6. The LED driving circuit with the function of the night light as claimed in claim 5, wherein the voltage boosting device is one of a resistor device, a voltage stabilizing diode, an LED lamp bead, a constant current tube and a discrete device.
7. The LED driving circuit with the function of the small night lamp as claimed in claim 6, wherein the resistor device comprises a fourth resistor and a fifth resistor connected in parallel, one common terminal of the fourth resistor and the fifth resistor is connected to the negative electrode of the small night lamp, and the other common terminal is connected to the fifth pin and the sixth pin of the switching chip.
8. The LED driving circuit with the function of the small night lamp as claimed in claim 6, wherein the discrete device comprises a second voltage regulator diode, a ninth resistor and a first triode, the collector of the first triode is connected with the negative electrode of the small night lamp and one end of the ninth resistor respectively, the base of the first triode is connected with the other end of the ninth resistor and the negative electrode of the second voltage regulator diode respectively, the positive electrode of the second voltage regulator diode is grounded, and the emitter of the first triode is connected with the fifth pin and the sixth pin of the switching chip.
9. The LED driving circuit with the function of night light as claimed in claim 5, wherein the switch detection unit comprises a seventh resistor, an eighth resistor and a second capacitor; one end of the seventh resistor is connected with one output end of the rectifier bridge, the other end of the seventh resistor is connected with one end of the eighth resistor and the second pin of the switch switching chip respectively, the other end of the eighth resistor is connected with the fourth pin of the switch switching chip and one end of the first capacitor respectively, the other end of the first capacitor is connected with the third pin of the switch switching chip, and the second capacitor is connected at two ends of the eighth resistor in parallel.
10. The LED driving circuit with a function of a small night light as set forth in claim 1, wherein the small night light and the main light use separate light sources or use the same light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921284322.8U CN210536989U (en) | 2019-08-09 | 2019-08-09 | LED drive circuit with little night-light function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921284322.8U CN210536989U (en) | 2019-08-09 | 2019-08-09 | LED drive circuit with little night-light function |
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| CN210536989U true CN210536989U (en) | 2020-05-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110351931A (en) * | 2019-08-09 | 2019-10-18 | 浙江阳光美加照明有限公司 | A kind of LED drive circuit with small night lamp function |
| TWI795962B (en) * | 2021-04-26 | 2023-03-11 | 李洲科技股份有限公司 | Lighting devices and lamps |
-
2019
- 2019-08-09 CN CN201921284322.8U patent/CN210536989U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110351931A (en) * | 2019-08-09 | 2019-10-18 | 浙江阳光美加照明有限公司 | A kind of LED drive circuit with small night lamp function |
| TWI795962B (en) * | 2021-04-26 | 2023-03-11 | 李洲科技股份有限公司 | Lighting devices and lamps |
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