CN210579370U - LED table lamp control circuit - Google Patents
LED table lamp control circuit Download PDFInfo
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- CN210579370U CN210579370U CN201921410049.9U CN201921410049U CN210579370U CN 210579370 U CN210579370 U CN 210579370U CN 201921410049 U CN201921410049 U CN 201921410049U CN 210579370 U CN210579370 U CN 210579370U
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Abstract
The utility model provides a LED table lamp control circuit, it includes rectifier circuit, luminance signal circuit, voltage frequency control circuit and LED light source, rectifier circuit is connected with alternating current commercial power, luminance signal circuit respectively with rectifier circuit with voltage frequency control circuit is connected, voltage frequency control circuit with the LED light source is connected, the rectification current is used for converting alternating current commercial power into the direct current, luminance signal circuit is used for sending PWM luminance signal and gives voltage frequency control circuit, voltage frequency control circuit is used for the basis PWM luminance signal is right the direct current's of rectifier circuit output conversion frequency is adjusted, and to the LED light source power supply. The utility model discloses a LED table lamp control circuit can eliminate the stroboscopic of LED table lamp.
Description
Technical Field
The utility model relates to a LED illumination field especially relates to an use no stroboscopic LED table lamp control circuit of non-isolation power.
Background
Most of eye-protection table lamps in the market are table lamps powered by an external power supply, and as shown in fig. 1, the table lamps convert alternating current into stable direct current through an AC-DC power conversion module. And then the light is output to the LED by a constant current to show a non-stroboscopic state. The circuit driving technology is mature, the technical condition of realizing no stroboflash is simple, and the circuit can be realized only by enabling the constant-current adjustable-light circuit of the desk lamp to work at high frequency of over 20KHZ generally and then filtering. However, such a desk lamp requires a special power conversion module, resulting in increased cost.
As shown in fig. 2, the table lamp is a table lamp of an ac direct power supply system, in which a current IC is built, but the frequency of a PWM (Pulse Width Modulation) signal and the output frequency are both low level, and the frequency of the PWM signal cannot be changed according to the situation due to no dynamic adjustment, which causes a problem of stroboflash.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can eliminate stroboscopic LED table lamp control circuit who uses non-isolated power.
The embodiment of the utility model provides an in, provide a LED table lamp control circuit, it includes rectifier circuit, luminance signal circuit, voltage frequency control circuit and LED light source, rectifier circuit is connected with exchanging the commercial power, luminance signal circuit respectively with rectifier circuit with voltage frequency control circuit is connected, voltage frequency control circuit with the LED light source is connected, rectifier circuit is used for exchanging the commercial power and changing into the direct current, luminance signal circuit is used for sending PWM luminance signal and gives voltage frequency control circuit, voltage frequency control circuit is used for the basis PWM luminance signal is right the direct current's of rectifier circuit output conversion frequency is adjusted, and to the LED light source power supply.
In the embodiment of the utility model provides an in, rectifier circuit includes rectifier chip BR1, connects transformer L2 between rectifier chip BR1 and the alternating current commercial power and connects electric capacity EC4 between rectifier chip BR 1's positive pole output and ground.
In the embodiment of the utility model, rectifier circuit still includes electric capacity C3 and inductance L7, electric capacity C3's one end ground connection, and the other end is connected with rectifier chip BR 1's positive output end through inductance L7.
In the embodiment of the present invention, the voltage and frequency adjusting circuit includes a chip CRM6237, resistors R1, R2, R5, R8, R14, R16, capacitors C1, C5, C9, diodes D3, D6, and transformers L5, L6, pin 1 of chip CRM6237 is grounded through resistor R8 and capacitor C9, pin 2 of chip CRM6237 is connected to the positive output terminal of rectifier chip BR1 through resistors R1, R2 in sequence, pin 3 of chip CRM6237 is connected to the PWM brightness adjusting signal output terminal of the brightness signal circuit, pin 4 of chip CRM6237 is grounded through resistor R16, pin 5 of chip CRM6237 is connected to the positive terminal of diode D6, the negative terminal of diode D6 is connected to the positive output terminal of rectifier chip BR1, one end of the first winding of transformer L6 is connected to pin 5 of chip CRM 37, one end of transformer L6 is grounded, and the other end of transformer L3 is connected to the positive output terminal of diode 625962, the cathode of the diode D3 is connected with a pin 2 of the chip CRM6237 through a resistor R14, a capacitor C1 is connected between the pin 2 of the chip CRM6237 and the ground, a resistor R5 is connected between the anode of the diode D3 and a pin 1 of the CRM6237, a first winding of a transformer L5 is connected between the anode output end of the rectifier chip BR1 and the LED power supply, a second winding of the transformer L5 is connected between the first winding of the transformer L6 and the LED power supply, and a capacitor C5 is connected between a pin 5 of the chip CRM6237 and the ground.
In the embodiment of the utility model provides an in, LED table lamp control circuit still include parallelly connected resistance R3 and electric capacity EC2 between rectifier chip BR 1's positive output and transformer L5, L6's the tie point.
The embodiment of the utility model provides an in, luminance signal circuit includes 51 series kernel singlechip U2, singlechip U2's pin 1 passes through electric capacity C11 ground connection, singlechip U2's pin 2 is respectively through electric capacity C15, C16 ground connection, singlechip U2's pin 3 is respectively through electric capacity C13, C14 ground connection, singlechip U2's pin 3 still connects rectifier chip BR 1's positive output end through resistance R12 and resistance R10, singlechip U2's pin 4 ground connection, singlechip U2's pin 5 is through resistance R11 ground connection, singlechip U2's pin 7 connects chip CRM 6237's pin 3 through resistance R13, singlechip U2's pin 6 and pin 8 vacant positions.
Compared with the prior art, the utility model discloses an among the LED table lamp control circuit, luminance signal circuit is used for sending PWM luminance signal and gives voltage frequency control circuit, voltage frequency control circuit is used for the basis PWM luminance signal is right the direct current conversion frequency of rectifier circuit output is adjusted, and to the LED light source power supply, when PWM luminance signal's duty cycle reduces, voltage frequency control circuit's output frequency rises to obtain more steady direct current voltage output, eliminate the stroboscopic.
Drawings
Fig. 1 is a schematic structural diagram of a prior art LED desk lamp.
Fig. 2 is a schematic structural diagram of another prior art LED desk lamp.
Fig. 3 is a schematic diagram of a control circuit of an LED desk lamp provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The implementation of the invention is described in detail below with reference to specific embodiments,
referring to fig. 3, in an embodiment of the present invention, a LED desk lamp control circuit is provided, which includes a rectification circuit, a brightness signal circuit, a voltage frequency adjustment circuit, and an LED light source. The LED light source is connected with the rectification circuit, the brightness signal circuit is respectively connected with the rectification circuit and the voltage frequency adjusting circuit, the voltage frequency adjusting circuit is connected with the LED light source, the rectification circuit is used for converting the alternating current commercial power into direct current, the brightness signal circuit is used for sending a PWM brightness signal to the voltage frequency adjusting circuit, and the voltage frequency adjusting circuit is used for adjusting the conversion frequency of the direct current output by the rectification circuit according to the PWM brightness signal and supplying power to the LED light source.
The voltage frequency adjusting circuit is used for adjusting the conversion frequency of the direct current output by the rectifying circuit according to the PWM brightness signal in the following way:
when the duty ratio of the PWM brightness signal is reduced, the output frequency of the voltage frequency regulating circuit is increased;
when the duty ratio of the PWM brightness signal is increased, the output frequency of the voltage frequency adjusting circuit is reduced.
The rectifying circuit comprises a rectifying chip BR1, a capacitor C3, an inductor L7, a transformer L2 connected between the rectifying chip BR1 and alternating current mains supply, and a capacitor EC4 connected between the positive output end of the rectifying chip BR1 and the ground. One end of the capacitor C3 is grounded, and the other end is connected to the positive output end of the rectifier chip BR1 through the inductor L7.
The voltage frequency adjusting circuit comprises a chip CRM6237, resistors R1, R2, R5, R8, R14 and R16, capacitors C1, C5 and C9, diodes D3 and D6, and transformers L5 and L6, wherein a pin 1 of the chip CRM6237 is grounded through a resistor R8 and a capacitor C9 respectively, a pin 2 of the chip CRM6237 is connected with an anode output end of a rectifier chip BR1 through resistors R1 and R2 in sequence, a pin 3 of the chip CRM6237 is connected with a PWM brightness adjusting signal output end of the brightness signal circuit, a pin 4 of the chip CRM6237 is grounded through a resistor R16, a pin 5 of the chip CRM6237 is connected with an anode of a diode D16, a cathode of the diode D16 is connected with an anode output end of the rectifier chip BR 16, one end of a first winding of the transformer L16 is connected with the pin 5 of the chip CRM6237, one end of a second winding of the transformer L16 is grounded, the other end of the diode CRM 16 is connected with an anode of the diode CRM 6272 and a cathode of the diode BR 16 is connected, the capacitor C1 is connected between the pin 2 of the chip CRM6237 and the ground, the resistor R5 is connected between the anode of the diode D3 and the pin 1 of the CRM6237, the first winding of the transformer L5 is connected between the anode output end of the rectifying chip BR1 and the LED power supply, the second winding of the transformer L5 is connected between the first winding of the transformer L6 and the LED power supply, and the capacitor C5 is connected between the pin 5 of the chip CRM6237 and the ground.
The LED desk lamp control circuit further comprises a resistor R3 and a capacitor EC2 which are connected between the anode output end of the rectifying chip BR1 and the connection point of the transformers L5 and L6 in parallel.
The brightness signal circuit comprises a 51-series kernel single-chip microcomputer U2, a pin 1 of the single-chip microcomputer U2 is grounded through a capacitor C11, a pin 2 of the single-chip microcomputer U2 is grounded through capacitors C15 and C16 respectively, a pin 3 of the single-chip microcomputer U2 is grounded through capacitors C13 and C14 respectively, a pin 3 of the single-chip microcomputer U2 is further connected with an anode output end of a rectifier chip BR1 through a resistor R12 and a resistor R10, a pin 4 of the single-chip microcomputer U2 is grounded, a pin 5 of the single-chip microcomputer U2 is grounded through a resistor R11, a pin 7 of the single-chip microcomputer U2 is connected with a pin 3 of a chip CRM6237 through a resistor R13, and a pin 6 and.
The working principle of the LED table lamp control circuit is as follows:
the rectification circuit converts alternating current commercial power into direct current voltage, and the direct current voltage is respectively output to the brightness signal circuit and the voltage frequency adjusting circuit, the brightness signal circuit adopts the direct current voltage output by the rectification circuit to supply power, and outputs a PWM brightness control signal to the voltage frequency adjusting circuit according to the adjustment of a user, the voltage frequency adjusting circuit adjusts the frequency of the direct current voltage output by the rectification circuit according to the PWM brightness control signal, when the duty ratio of the PWM brightness signal is reduced, the voltage frequency adjusting circuit raises the frequency of the direct current voltage output by the rectification circuit and supplies power to the LED light source, so that more stable direct current voltage output is obtained, and stroboflash is eliminated.
To sum up, the utility model discloses an among the LED table lamp control circuit, luminance signal circuit is used for sending PWM luminance signal and gives voltage frequency control circuit, voltage frequency control circuit is used for the basis PWM luminance signal is right the direct current conversion frequency of rectifier circuit output is adjusted, and to the LED light source power supply, when PWM luminance signal's duty cycle reduces, voltage frequency control circuit's output frequency rises to obtain more steady direct current voltage output, eliminate the stroboscopic.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a LED table lamp control circuit, its characterized in that includes rectifier circuit, luminance signal circuit, voltage frequency control circuit and LED light source, rectifier circuit is connected with alternating current commercial power, luminance signal circuit respectively with rectifier circuit with voltage frequency control circuit is connected, voltage frequency control circuit with the LED light source is connected, rectifier circuit is used for exchanging the commercial power and changing into the direct current, luminance signal circuit is used for sending PWM luminance signal for voltage frequency control circuit, voltage frequency control circuit is used for according to PWM luminance signal is right the direct current's that rectifier circuit output conversion frequency is adjusted, and to the LED light source power supply.
2. The LED table lamp control circuit of claim 1, wherein the rectifying circuit comprises a rectifying chip BR1, a transformer L2 connected between the rectifying chip BR1 and the AC mains supply, and a capacitor EC4 connected between the positive output end of the rectifying chip BR1 and the ground.
3. The LED table lamp control circuit as claimed in claim 2, wherein the rectifying circuit further comprises a capacitor C3 and an inductor L7, one end of the capacitor C3 is connected to ground, and the other end is connected to the positive output end of the rectifying chip BR1 through the inductor L7.
4. The LED table lamp control circuit according to claim 3, wherein the voltage frequency adjusting circuit comprises a chip CRM6237, resistors R1, R2, R5, R8, R14, R16, capacitors C1, C5, C9, diodes D3, D6 and transformers L5, L6, wherein the pin 1 of the chip CRM6237 is grounded through the resistor R8 and the capacitor C9, respectively, the pin 2 of the chip CRM6237 is connected to the positive output terminal of the rectifier chip BR1 through the resistors R1, R2 in sequence, the pin 3 of the chip CRM6237 is connected to the PWM brightness adjusting signal output terminal of the brightness signal circuit, the pin 4 of the chip CRM6237 is grounded through the resistor R16, the pin 5 of the chip CRM6237 is connected to the positive electrode of the diode D62 6, the negative electrode of the diode D6 is connected to the positive output terminal of the rectifier chip BR1, one end of the first winding of the transformer L6 is connected to the pin 365 of the chip CRM6237, and the other end of the second winding is connected to the positive electrode 3 of the diode CRM 6258, the cathode of the diode D3 is connected with a pin 2 of the chip CRM6237 through a resistor R14, a capacitor C1 is connected between the pin 2 of the chip CRM6237 and the ground, a resistor R5 is connected between the anode of the diode D3 and a pin 1 of the CRM6237, a first winding of a transformer L5 is connected between the anode output end of the rectifier chip BR1 and the LED power supply, a second winding of the transformer L5 is connected between the first winding of the transformer L6 and the LED power supply, and a capacitor C5 is connected between a pin 5 of the chip CRM6237 and the ground.
5. The LED table lamp control circuit as claimed in claim 4, further comprising a resistor R3 and a capacitor EC2 connected in parallel between the positive output terminal of the rectifier chip BR1 and the connection point of the transformers L5 and L6.
6. The LED table lamp control circuit as claimed in claim 4, wherein the brightness signal circuit comprises a 51-series kernel single chip microcomputer U2, pin 1 of the single chip microcomputer U2 is grounded through a capacitor C11, pin 2 of the single chip microcomputer U2 is grounded through capacitors C15 and C16, pin 3 of the single chip microcomputer U2 is grounded through capacitors C13 and C14, pin 3 of the single chip microcomputer U2 is further connected with the positive output end of the rectifier chip BR1 through a resistor R12 and a resistor R10, pin 4 of the single chip microcomputer U2 is grounded, pin 5 of the single chip microcomputer U2 is grounded through a resistor R11, pin 7 of the single chip microcomputer U2 is connected with pin 3 of the chip 6237 through a resistor R13, and pin 6 and pin 8 of the single chip microcomputer U2 are left vacant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921410049.9U CN210579370U (en) | 2019-08-28 | 2019-08-28 | LED table lamp control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921410049.9U CN210579370U (en) | 2019-08-28 | 2019-08-28 | LED table lamp control circuit |
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| CN210579370U true CN210579370U (en) | 2020-05-19 |
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| CN201921410049.9U Active CN210579370U (en) | 2019-08-28 | 2019-08-28 | LED table lamp control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110475407A (en) * | 2019-08-28 | 2019-11-19 | 深圳市帝狼光电有限公司 | A kind of LED desk lamp control circuit |
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2019
- 2019-08-28 CN CN201921410049.9U patent/CN210579370U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110475407A (en) * | 2019-08-28 | 2019-11-19 | 深圳市帝狼光电有限公司 | A kind of LED desk lamp control circuit |
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