CN110113846B - LED dimming system of self-adaptation different power sections - Google Patents
LED dimming system of self-adaptation different power sections Download PDFInfo
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- CN110113846B CN110113846B CN201910521258.9A CN201910521258A CN110113846B CN 110113846 B CN110113846 B CN 110113846B CN 201910521258 A CN201910521258 A CN 201910521258A CN 110113846 B CN110113846 B CN 110113846B
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- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims 9
- 230000003044 adaptive effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012952 Resampling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
Abstract
The invention provides an LED dimming system adaptive to different power sections, which comprises: the LED load is connected with an MOS and a voltage output detection circuit, the MOS is connected with a back-cut PWM module, the voltage output detection circuit is connected with a sampling circuit and a chopping CC/CV control chip, the sampling circuit is connected with the chopping CC/CV control chip through an MCU chip, and the chopping CC/CV control chip is connected with a mains supply through a rectifying and filtering circuit; the product types and stock of stock are reduced, the production and processing are improved, and the production efficiency and the straight-through rate are improved.
Description
Technical Field
The invention relates to the technical field of LED intelligent dimming, in particular to an LED dimming system adaptive to different power sections.
Background
At present, the demands of people on LED intelligent dimming products are increasing, under the compression of cost, more manufacturers can adopt a path of constant current and constant voltage chips to adopt two paths of different-color lamp beads to connect MOS (metal oxide semiconductor) tubes in series at the output end, brightness and color temperature are adjusted by means of PWM (pulse width modulation), and the LED intelligent dimming products are custom called half-power dimming (single-path full-brightness and two paths of full-brightness work in a constant current mode, and PWM dimming work in a constant voltage mode), but because a main control chip is a constant current and constant voltage chip, the chips can only default one voltage output and cannot be compatible with lamp bead loads with lower voltage (serial numbers) at the same time.
For example, the dimming power supply is required to be 52-72V/150mA, the constant voltage and constant current of the power supply can only be 72V/150mA, if the voltage of the lamp bead carried by the power supply is 52V, the normal lighting single-circuit and full lighting can be operated normally (constant current state, the output voltage can be automatically regulated according to the load voltage of the lamp bead), the constant voltage state is only entered when PWM dimming is carried out (Vout can be default constant at 72V), the redundant 20V voltage can be forcibly added to the two ends of the MOS tube, the preset PWM dimming ratio can be increased by the 20V voltage, even the output current is larger than the preset 150mA, so that the MOS and the lamp bead can be damaged due to the excessive rated power, and the 52-72V can not be compatible and can only be realized by a specific voltage; thus, a number of specifications and versions need to be customized to address this problem.
Disclosure of Invention
The invention provides an LED dimming system adaptive to different power sections, which solves the problems in the background technology.
The technical problems solved by the invention are realized by adopting the following technical scheme: an LED dimming system that adapts to different power segments, comprising: the LED load is connected with an MOS and a voltage output detection circuit, the MOS is connected with a post-cut PWM module, the voltage output detection circuit is connected with a sampling circuit and a chopping CC/CV control chip, the sampling circuit is connected with the chopping CC/CV control chip through an MCU chip, the chopping CC/CV control chip is connected with a mains supply through a rectifying filter circuit, after power-on, the voltage at two ends of the winding of L1A is equal to 72V when the main control chip demagnetizes, the L1B senses 24V voltage, the 24V voltage is divided by R5 and R6, and the MCU can sample the 238mV voltage value; assuming Vout is 60V, then a voltage value of 198mV is sampled, and assuming Vout is 52V, then a voltage value of 171mV is sampled; setting AD values corresponding to a plurality of Vout; then, which AD value is detected, and Q1, Q2 or Q3 is selected to be conducted through high and low level taps of I/O1, I/O2 and I/O3; this results in a different FB resistance, thus achieving automatic adjustment of this voltage of Vout.
The MCU remembers the sampled VD value through the built-in EEPROM, so that a proper I/O port is selected to control the required no-load voltage, the state is always kept when the VDD of the MCU is not clear, the no-load voltage in the operation of the period is ensured to be a value set by us, and PWM dimming can be carried out according to the obtained no-load voltage in the period.
Compared with the prior art, the invention has the beneficial effects that: the invention can adapt to the application of variable output voltage in a certain range; the product types and stock of stock are reduced, the production and processing are improved, and the production efficiency and the straight-through rate are improved.
Drawings
Fig. 1 is a schematic diagram of a system of the present invention.
Fig. 2is a schematic circuit diagram of the present invention.
Detailed Description
In order that the manner in which the features and objects and functions of the invention are attained and can be readily understood, reference should be made to the following detailed description of the invention in which, unless otherwise indicated and limited by the context, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected or detachably connected, or integrally connected or mechanically and electrically connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements.
As shown in fig. 1 and 2, an LED dimming system adaptive to different power segments includes: the LED load is connected with an MOS and a voltage output detection circuit, the MOS is connected with a post-cut PWM module, the voltage output detection circuit is connected with a sampling circuit and a chopping CC/CV control chip, the sampling circuit is connected with the chopping CC/CV control chip through an MCU chip, the chopping CC/CV control chip is connected with a mains supply through a rectifying filter circuit, after power-on, the voltage at two ends of the winding of L1A is equal to 72V when the main control chip demagnetizes, the L1B senses 24V voltage, the 24V voltage is divided by R5 and R6, and U2 is sampled to the 238mV voltage value; assuming Vout is 60V, then a voltage value of 198mV is sampled, and assuming Vout is 52V, then a voltage value of 171mV is sampled; setting AD values corresponding to a plurality of Vout; then, which AD value is detected, and Q1, Q2 or Q3 is selected to be conducted through high and low level taps of I/O1, I/O2 and I/O3; this results in a different FB resistance, thus achieving automatic adjustment of this voltage of Vout.
The MCU remembers the sampled VD value through the built-in EEPROM, so that a proper I/O port is selected to control the required no-load voltage, the state is always kept when the VDD of the MCU is not clear, the no-load voltage in the operation of the period is ensured to be a value set by us, and PWM dimming can be carried out according to the obtained no-load voltage in the period.
The working principle of the invention is as follows:
1) After power-on, assuming that Vout is 72V, the voltage at two ends of the winding of L1A is equal to 72V when the main control chip demagnetizes the loop, then L1B can sense 24V (because L1A is 108 turns and L1B is 36 turns), the voltage of 24V is divided by R5 (200K) and R6 (2K), and U2 can sample the 238mV voltage value (AD value); assuming Vout is 60V, then a voltage value of 198mV is sampled, and assuming Vout is 52V, then a voltage value of 171mV is sampled; by analogy, the lower the Vout is, the lower the sampled voltage value is, so that AD values corresponding to a plurality of Vout can be set; then, which AD value is detected, and Q1, Q2 or Q3 is selected to be conducted through high and low level taps of I/O1, I/O2 and I/O3; thus, different FB resistances can be obtained, and the voltage of Vout can be automatically adjusted.
2) The back-cut PWM module is matched with the requirements that when power is on, the back-cut PWM module needs to be set to be in a single-channel full-bright state (at the moment, the back-cut PWM module works in a constant-current mode, namely, the highest voltage of a lamp bead) and the sampled VD value is memorized through an EEPROM (electrically erasable programmable read-Only memory) built in an MCU (micro-controller unit) so as to select a proper idle voltage required by I/O port control, when the VDD of the MCU is not clear, the state is always saved, the idle voltage in the operation of the time period can be ensured to be a set value, and PWM dimming can be carried out according to the obtained idle voltage in the time period; since such products generally require that the switching of the color temperature and the small night light is also achieved by a wall switch (repeated switch), the VDD maintenance time of the MCU is set to about 1.5S when switching; then after 1.5S power-off, the above process is repeated as long as VDD is cleared, and the resampling of the AD value starts automatic control.
The invention adopts MCU sampling, the primary power-on is set as a single-channel full-lighting (at the moment, the power-on works in a constant-current mode, namely, the highest voltage of the lamp beads), at the moment, the MCU samples the AD value of the output voltage and stores the AD value into the EEPROM, then the control foot of the MCU controls the FB foot of chopping CC/CV, and VOUT is regulated to a proper no-load voltage, thus the self-adaption Vout can be realized, the proper output voltage can be obtained for PWM dimming, and the control logic always exists as long as the VDD of the MCU is not cleared; if VDD is cleared after power failure, the process is repeated.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An LED dimming system that adapts to different power segments, comprising: LED load, its characterized in that: the LED load is connected with an MOS and a voltage output detection circuit, the MOS is connected with a post-cut PWM module, the voltage output detection circuit comprises a sampling circuit, a chopping CC/CV control chip and an MCU chip, the sampling circuit is connected with the chopping CC/CV control chip through the MCU chip, the chopping CC/CV control chip is connected with a mains supply through a rectifying filter circuit, after the power-on, when Vout is 72V, the voltage at two ends of a winding of a first magnetic core inductor L1A is equal to 72V when the main control chip demagnetizes the loop, a second magnetic core inductor L1B senses 24V voltage, the 24V voltage is divided through a fifth resistor R5 and a sixth resistor R6, and the MCU chip samples the 238mV voltage value; when Vout is 60V, then 198mV is sampled, and when Vout is 52V, then 171mV is sampled; setting AD values corresponding to a plurality of Vout; then, detecting which AD value is selected to be conducted by the high and low level of the I/O1, the I/O2 and the I/O3, and conducting the first MOS tube Q1, the second MOS tube Q2 or the third MOS tube Q3; different FB resistors are obtained, so that the voltage of Vout is automatically adjusted;
the grid electrode of the fourth MOS tube Q4 is connected with the PWM1 pin of the post-cut PWM module, the drain electrode of the fourth MOS tube Q4 is connected with the cathode of the third light-emitting diode LEDW, and the source electrode signal of the fourth MOS tube Q4 is grounded; the grid electrode of the fifth MOS tube Q5 is connected with the PWM2 pin of the post-cut PWM module, the drain electrode of the fifth MOS tube Q5 is connected with the cathode of the fourth light-emitting diode LEDY, and the source electrode signal of the fifth MOS tube Q5 is grounded; the anode of the third light emitting diode LEDW is connected with the cathode of the first light emitting diode LED1, and the anode of the fourth light emitting diode LEDY is connected with the cathode of the second light emitting diode LED 2;
The anode of the first light emitting diode LED1 and the anode of the second light emitting diode LED2 are commonly connected to one end of a fourth resistor R4, the anode of a second polar capacitor C2, the cathode of a third switching diode D3 and one end of a first resistor R1, the cathode of the second polar capacitor C2 and the other end of the fourth resistor R4 are commonly connected to one end of a first magnetic core inductor L1A, and the other ends of the cathode of the second polar capacitor C2 and the fourth resistor R4 and one end of the first magnetic core inductor L1A are both grounded in signal; the model of the first magnetic core inductance L1A is EE16W10,0.17mm x 108ts;
The DR pin of the chopper CC/CV control chip is connected to the other end of the first magnetic core inductance L1A and the anode of the third switching diode D3; the VCC pin of the chopper CC/CV control chip is connected with the other end of the first resistor R1, the positive electrode of the third polar capacitor C3 and one end of the second resistor R2, the negative electrode shell of the third polar capacitor C3 is grounded, and the other end of the second resistor R2 is connected with the cathode of the second rectifying diode D2; GND pin shell of chopper CC/CV control chip is grounded;
the anode of the second rectifying diode D2 is respectively connected with one end of the second magnetic core inductor L1B, the anode of the first rectifying diode D1 and one end of the third resistor R3; the cathode of the first rectifying diode D1 is respectively connected with the anode of the fourth polar capacitor C4, one end of the fifth resistor R5 and one end of the seventh resistor R7; the other end of the fifth resistor R5 is connected with one end of a sixth resistor R6, the other end of the seventh resistor R7 is respectively connected with the cathode of the first zener diode ZD1, one end of a fifth nonpolar capacitor C5 and the VDD pin of the MCU chip, the cathode of a fourth polar capacitor C4, the other end of the sixth resistor R6, the anode of the first zener diode ZD1 and the other end of the fifth nonpolar capacitor C5 are all connected to the GND pin of the MCU chip, the model of the second magnetic core inductor L1B is EE16W 10.13 mm 36ts, the fifth resistor R5 is 200K ohms, and the sixth resistor R6 is 2K ohms;
The PA0 pin of the MCU chip is connected with the other end of the fifth resistor R5 and one end of the sixth resistor R6 respectively, and is used for detecting the AD value between the fifth resistor R5 and the sixth resistor R6, the PA1 pin of the MCU chip is connected with the grid electrode of the first MOS tube Q1, and the PA1 pin is used as the signal output of the I/O1 to control the on and off of the first MOS tube Q1; the PC1 pin of the MCU chip is connected with the grid electrode of the second MOS tube Q2, and is used as the signal output of the I/O2 to control the on and off of the second MOS tube Q2; the PA6 pin of the MCU chip is connected with the grid electrode of the third MOS tube Q3, and is used as the signal output of the I/O3 to control the on and off of the third MOS tube Q3;
The drain electrode of the first MOS tube Q1 is connected with one end of a resistor F1, the drain electrode of the second MOS tube Q2 is connected with one end of a resistor F2, the drain electrode of the third MOS tube Q3 is connected with one end of a resistor F3, the source electrode of the first MOS tube Q1, the second MOS tube Q2, the source electrode of the third MOS tube Q3 and one end of a resistor FO are all grounded through shells, and the other ends of the resistor F1, the resistor F2, the resistor F3 and the resistor F0 and the other end of the third resistor R3 are all connected with the FB pin of the chopping CC/CV control chip; the CS foot of the chopper CC/CV control chip is connected with one end of a resistor RS1, and the other end shell of the resistor RS1 is grounded.
2. An LED dimming system adapted to different power segments as claimed in claim 1, wherein: the MCU remembers the sampled AD value through the built-in EEPROM, so that a proper I/O port is selected to control the required no-load voltage, the state is always kept when the VDD of the MCU is not clear, the no-load voltage in the operation of the period is ensured to be a set value, and PWM dimming can be carried out according to the obtained no-load voltage in the period.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910521258.9A CN110113846B (en) | 2019-06-17 | 2019-06-17 | LED dimming system of self-adaptation different power sections |
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| CN201910521258.9A CN110113846B (en) | 2019-06-17 | 2019-06-17 | LED dimming system of self-adaptation different power sections |
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| CN110113846A CN110113846A (en) | 2019-08-09 |
| CN110113846B true CN110113846B (en) | 2024-05-03 |
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| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
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| CN103347341A (en) * | 2013-07-12 | 2013-10-09 | 惠州伟志电子有限公司 | Novel high-power fishing lamp wireless control system |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
| US9609713B1 (en) * | 2015-12-23 | 2017-03-28 | Zhuhai Shengchang Electronics Co., Ltd. | Kind of pulse width dimming control circuit for LED phase cut dimming power supply |
| CN210274617U (en) * | 2019-06-17 | 2020-04-07 | 无锡格兰德微电子科技有限公司 | LED dimming system adaptive to different power sections |
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2019
- 2019-06-17 CN CN201910521258.9A patent/CN110113846B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347341A (en) * | 2013-07-12 | 2013-10-09 | 惠州伟志电子有限公司 | Novel high-power fishing lamp wireless control system |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
| US9609713B1 (en) * | 2015-12-23 | 2017-03-28 | Zhuhai Shengchang Electronics Co., Ltd. | Kind of pulse width dimming control circuit for LED phase cut dimming power supply |
| CN210274617U (en) * | 2019-06-17 | 2020-04-07 | 无锡格兰德微电子科技有限公司 | LED dimming system adaptive to different power sections |
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