CN107690213B - Non-isolated low-voltage non-flicker LED driving circuit - Google Patents
Non-isolated low-voltage non-flicker LED driving circuit Download PDFInfo
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- CN107690213B CN107690213B CN201710965339.9A CN201710965339A CN107690213B CN 107690213 B CN107690213 B CN 107690213B CN 201710965339 A CN201710965339 A CN 201710965339A CN 107690213 B CN107690213 B CN 107690213B
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- 238000001514 detection method Methods 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 10
- 230000004397 blinking Effects 0.000 claims abstract description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000005347 demagnetization Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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]
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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]
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- Emergency Protection Circuit Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a non-isolated low-voltage non-blinking LED driving circuit, which relates to the technical field of LED driving and comprises a starting resistor R1, a voltage stabilizing capacitor C1, a UVLO module, a demagnetizing time detection module, a system control module, a peak value detection module, an LED open circuit protection module, a high-voltage MOS tube M1, a high-voltage MOS tube M2, a resistor Rs and an LED lighting circuit; the LED open circuit protection device further comprises a maximum conduction time detection module, and when the maximum conduction time detection module detects that the inductance conduction time reaches the maximum value set in the interior, a trigger signal is output to shield the LED open circuit protection module in the demagnetizing period. Under the condition of the same input power, the capacity value of the bus input high-voltage capacitor can be reduced, so that the cost can be reduced; under the condition of the same input power, lower input bus voltage can be realized and the LED lamp is kept from flickering; under the condition of unstable power grid voltage, the LED lamp can be kept from flickering.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to a non-isolated low-voltage non-flickering LED driving circuit.
Background
The non-isolated driving chips adopted in the domestic market at present are all buck-type BCM mode driving chips, the system output LED voltage is between 80V and 200V, meanwhile, the current is about 200mA to 350mA, and even 420mA is used, so that the input power is very high. Meanwhile, under the condition of low input voltage, the LED lamp can flash easily. This requires that the bus input capacitance be as large as possible. The greater the power, the greater the required input capacitance.
Disclosure of Invention
The invention aims to solve the technical problem that LEDs flash after the bus voltage is reduced in the existing LED driving circuit.
In order to solve the technical problems, the utility model adopts the technical scheme that: a non-isolated low-voltage non-flicker LED driving circuit comprises a starting resistor R1, a voltage stabilizing capacitor C1, a UVLO module, a demagnetizing time detection module, a system control module, a peak detection module, an LED open circuit protection module, a high-voltage MOS tube M1, a high-voltage MOS tube M2, a resistor Rs and an LED lighting circuit; the lighting circuit comprises an LED lamp tube, a resistor, a capacitor and an inductor; the UVLO module is used for setting up upper and lower voltages for opening and closing the LED lighting circuit and preventing repeated opening and closing; the power supply charges the voltage stabilizing capacitor C1 through the starting resistor R1; the voltage stabilizing capacitor C1 is connected with the UVLO module and the grid electrode of the high-voltage MOS tube M2, the source electrode of the high-voltage MOS tube M2 is connected with the lighting circuit, and the drain electrode is connected with the demagnetizing time detection module and the source electrode of the high-voltage MOS tube; the demagnetizing time detection module is used for setting the demagnetizing time of the inductor to perform overvoltage protection on the LED lamp tube and is connected with the system control module; the resistor Rs is connected with the source electrode of the MOS tube M1, and the peak detection module is connected with the resistor Rs and is used for setting the peak current of the LED lamp tube and connected with the system control module; the system control module controls the on-off of the high-voltage MOS tube M1 according to the control signal; the LED open-circuit protection module is used for overvoltage protection of the LED lamp tube; the LED open circuit protection device further comprises a maximum conduction time detection module, and when the maximum conduction time detection module detects that the inductance conduction time reaches the maximum value set in the interior, a trigger signal is output to shield the LED open circuit protection module in the demagnetizing period.
Further, the maximum on-time detection module comprises a DRV driving module, an inverter, two common-grid NMOS tubes, a PMOS tube, a current source I1, a hysteresis comparator, an RS trigger and a reset signal generation module, wherein the emitted signals are in phase with the grid of the high-voltage MOS tube, the DRV driving module is respectively connected with the inverter and the reset signal generation module, the output end of the inverter is connected with the grid of the NMOS tube and the grid of the PMOS tube, the drain electrode of the PMOS tube is connected with the current source I1, the source electrode of the NMOS tube is connected with the drain electrode of the NMOS tube, the source electrode of the NMOS is grounded, the positive electrode of the hysteresis comparator is connected with the drain electrode of the NMOS tube and the source electrode of the PMOS tube, the negative electrode of the hysteresis comparator is connected with a reference voltage, the output end of the hysteresis comparator is connected with the input end S of the RS trigger, the reset signal generation module is connected with the input end R of the RS trigger, and the RS trigger is connected with the LED open-circuit protection module.
Further, the device also comprises an internal 5V voltage generation module for generating a 5V voltage and a reference voltage.
From the technical scheme, the invention has the following advantages: when the output is 24 strings of LED lamps (the voltage of the LED lamps is about 76V), full-voltage input (80V-265V input) can be realized, and the LED lamps do not flash; under the condition of the same input power, the capacity value of the bus input high-voltage capacitor can be reduced, so that the cost can be reduced; under the condition of the same input power, lower input bus voltage can be realized and the LED lamp is kept from flickering; under the condition of unstable power grid voltage, the LED lamp can be kept from flickering.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a waveform diagram of the busbar voltage of the present utility model;
FIG. 3 is a schematic circuit diagram of a maximum on-time detection module according to the present invention;
FIG. 4 is a waveform diagram of signals of the circuit of the present invention during normal operation;
FIG. 5 is a graph showing waveforms of signals of the circuit of the present invention after the bus voltage is reduced;
Fig. 6 is a schematic circuit diagram of a shielding portion in the present invention.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings
As shown in FIG. 1, the non-isolated low-voltage non-blinking LED driving circuit comprises a starting resistor R1, a voltage stabilizing capacitor C1, a module for generating internal 5V voltage, a UVLO module, a demagnetizing time detection module, a system control module, a peak value detection module, an LED open circuit protection module, a high-voltage MOS tube M1, a high-voltage MOS tube M2, a resistor Rs and an LED lighting circuit; the lighting circuit comprises an LED lamp tube, a resistor, a capacitor and an inductor; the internal 5V voltage generation module is used for generating 5V voltage and reference voltage and is used for each module of the system; the UVLO module is used for setting up upper and lower voltages for opening and closing the LED lighting circuit and preventing repeated opening and closing; the power supply charges the voltage stabilizing capacitor C1 through the starting resistor R1; the voltage stabilizing capacitor C1 is connected with the UVLO module and the grid electrode of the high-voltage MOS tube M2, the source electrode of the high-voltage MOS tube M2 is connected with the lighting circuit, and the drain electrode is connected with the demagnetizing time detection module and the source electrode of the high-voltage MOS tube; the demagnetizing time detection module is used for setting the demagnetizing time of the inductor to perform overvoltage protection on the LED lamp tube and is connected with the system control module; the resistor Rs is connected with the source electrode of the MOS tube M1, and the peak detection module is connected with the resistor Rs and is used for setting the peak current of the LED lamp tube and connected with the system control module; the system control module controls the on-off of the high-voltage MOS tube M1 according to the control signal; the LED open-circuit protection module is used for overvoltage protection of the LED lamp tube; the LED open circuit protection device further comprises a maximum conduction time detection module, and when the maximum conduction time detection module detects that the inductance conduction time reaches the maximum value set in the interior, a trigger signal is output to shield the LED open circuit protection module in the demagnetizing period.
As shown in figure one. After the system is electrified, the capacitor C1 of the VDD port is charged through the starting resistor R1, when the voltage is charged to UVLO_ON, the system starts to start, the internal NMOSFET, M1 is turned ON, current flows through the LED lamp, the inductor flows to the DN port, the voltage of Rs slowly increases along with the increase of the current and is detected by the peak detection module, when the voltage of Rs reaches the peak detection point in the system, the system turns off the M1 tube, the system enters a demagnetizing mode, the inductor starts to demagnetize, and the inductor current forms a discharge loop to the LED lamp through the Schottky diode and discharges. When the current of the inductor is zero, parasitic capacitance of the NMOSFET of the inductor and DN port starts to resonate, and when the internal demagnetization detection circuit detects the inductor resonance waveform, the demagnetization is considered to be finished, and then the internal NMOSFET M1 is restarted, and the above steps are repeated.
The system finally works in BCM critical conduction mode, and meanwhile, the LED overvoltage detection is set by detecting the demagnetizing time of the LED. When the demagnetizing time of the LED is smaller than the minimum demagnetizing time set in the LED, the system considers that the output voltage exceeds the set maximum value, and the circuit generates LED overvoltage protection. The bus voltage is a signal obtained by rectifying an alternating current signal through a diode bridge stack, the ripple voltage is shown as a graph II, when the input alternating current signal is reduced, the bus voltage is reduced, the load voltage of the LED is unchanged, when the voltage reaches the bus voltage shown as a graph II, the voltage drop on the inductor is reduced, the charging time of the inductor is prolonged, after the charging time of the inductor reaches the maximum value set in the inductor, if the Rs voltage does not reach the detection point of the peak detection voltage yet, the LED current is gradually reduced, and the demagnetizing time is calculated according to the following formula:
Therefore, when IP (peak current of inductance) decreases, it means that the time T OFF decreases gradually, and when the time T OFF decreases to the minimum demagnetization time set internally, the system will generate LED overvoltage protection, and the LED lamp will be turned off. When the bus voltage reaches the bus upper voltage, the LED normally works again, and the LED is enabled to flash in the repetition, the maximum conduction time detection is increased, when the system inductance conduction time is detected to reach the maximum value set in the system, the system is considered to work in the bus lower voltage state, a trigger signal S1 is output, and the S1 signal shields the LED open circuit protection module in the demagnetizing period, so that the LED lamp cannot be turned off. When the next cycle starts, the signal S1 is reset and detected during the cycle. In this way, each cycle can be detected and processed accordingly. In this case the LED lamp will not flash and the current of the LED lamp will be correspondingly reduced.
The maximum on-time detection module is shown in fig. 3, and comprises a DRV driving module, an inverter, two common-grid NMOS tubes, a PMOS tube, a current source I1, a hysteresis comparator, an RS trigger and a reset signal generation module, wherein the emitted signals are in phase with the grid of the high-voltage MOS tube, the DRV driving module is respectively connected with the inverter and the reset signal generation module, the output end of the inverter is connected with the grid of the NMOS tube and the grid of the PMOS tube, the drain electrode of the PMOS tube is connected with the current source I1, the source electrode of the NMOS tube is connected with the drain electrode of the NMOS tube, the source electrode of the NMOS is grounded, the anode of the hysteresis comparator is connected with the drain electrode of the NMOS tube and the source electrode of the PMOS tube, the cathode of the hysteresis comparator is connected with the reference voltage, the output end of the hysteresis comparator is connected with the input end S of the RS trigger, the reset signal generation module is connected with the input end R of the RS trigger, and the RS trigger is connected with the LED open-circuit protection module. The so-called masking process, i.e. the output signal of the LED protection module is not transmitted. The output OUT is always low corresponding to the low level of S1 of the RS flip-flop, and the OVP signal can be transmitted to the OUT port when S1 is high, as shown in fig. 6.
The working principle is as follows: the DRV driving module inputs a DRV signal which is equal to a grid driving signal of the high-voltage MOS tube M1, when the DRV is high voltage, the high-voltage MOS tube M1 is opened, and the system enters a forward state; when the DRV is at low voltage, the high-voltage MOS tube M1 is closed, and the system enters a demagnetizing state. In fig. 3, DRV is high, the VA signal rises from 0V, and under normal conditions, the VA voltage is always smaller than VREF, S2 is always low, S1 is always high, and RST resets the RS flip-flop every cycle. The LED open circuit protection module is unaffected and the waveform is as shown in fig. 4. After the bus voltage is reduced, the inductance charging time becomes longer at this time, when the DRV signal is high voltage, the VA signal starts to rise from 0V and rises to VREF, (the time when the VA signal rises from 0V to VREF is the maximum on time TON_MAX), the hysteresis comparator is turned over at this time, and the S2 signal is turned over to trigger to close the M1 tube shown in the first figure, namely the system is closed. The S1 signal toggles to trigger the mask OVP module signal. At this time, the OVP does not function and the LED lamp does not flash during the time of demagnetization of the system, and the waveform is shown in fig. 5.
Claims (2)
1. A non-isolated low-voltage non-flicker LED driving circuit comprises a starting resistor R1, a voltage stabilizing capacitor C1, a UVLO module, a demagnetizing time detection module, a system control module, a peak detection module, an LED open circuit protection module, a high-voltage MOS tube M1, a high-voltage MOS tube M2, a resistor Rs and an LED lighting circuit;
The lighting circuit comprises an LED lamp tube, a resistor, a capacitor and an inductor;
The UVLO module is used for setting up upper and lower voltages for opening and closing the LED lighting circuit and preventing repeated opening and closing;
the power supply charges the voltage stabilizing capacitor C1 through the starting resistor R1;
the voltage stabilizing capacitor C1 is connected with the UVLO module and the grid electrode of the high-voltage MOS tube M2, the source electrode of the high-voltage MOS tube M2 is connected with the lighting circuit, and the drain electrode is connected with the demagnetizing time detection module and the source electrode of the high-voltage MOS tube M1;
the demagnetizing time detection module is used for setting the demagnetizing time of the inductor to perform overvoltage protection on the LED lamp tube and is connected with the system control module; when the demagnetizing time of the LED lamp tube is smaller than the minimum demagnetizing time set in the LED lamp tube, the demagnetizing time detection module considers that the output voltage exceeds the set maximum value, and the circuit generates LED overvoltage protection; the demagnetizing time T OFF of the LED lamp tube is calculated as follows:
T OFF = IP L/VLED, IP is the peak current of the inductor, L is the magnitude of the inductance value of the inductor, and VLED is the voltage of the LED tube;
The resistor Rs is connected with the drain electrode of the high-voltage MOS tube M1, and the peak detection module is connected with the resistor Rs and is used for setting the peak current of the LED lamp tube and connected with the system control module;
the system control module controls the on-off of the high-voltage MOS tube M1 according to the control signal;
the LED open-circuit protection module is used for overvoltage protection of the LED lamp tube;
The method is characterized in that: the LED open circuit protection device further comprises a maximum conduction time detection module, and when the maximum conduction time detection module detects that the inductance conduction time reaches the maximum value set in the interior, a trigger signal is output to shield the LED open circuit protection module in the demagnetizing period;
The maximum on-time detection module comprises a DRV driving module, an inverter, a current source I1, a hysteresis comparator, an RS trigger and a reset signal generation module, wherein the emitted signals are in phase with the grid electrodes of the NMOS tube and the PMOS tube which are in common, the DRV driving module is respectively connected with the inverter and the reset signal generation module, the output end of the inverter is connected with the grid electrodes of the NMOS tube and the PMOS tube, the drain electrode of the PMOS tube is connected with the current source I1, the source electrode is connected with the drain electrode of the NMOS tube, the source electrode of the NMOS is grounded, the drain electrode of the NMOS tube is connected with the source electrode of the PMOS tube, the anode of the hysteresis comparator is connected with a reference voltage, the output end of the hysteresis comparator is connected with the input end S of the RS trigger, the reset signal generation module is connected with the input end R of the RS trigger, and the RS trigger is connected with the LED open-circuit protection module.
2. The non-isolated low voltage non-blinking LED driver circuit of claim 1 wherein: the apparatus further includes an internal 5V voltage generation module for generating a 5V voltage and a reference voltage.
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| CN201710965339.9A CN107690213B (en) | 2017-10-17 | 2017-10-17 | Non-isolated low-voltage non-flicker LED driving circuit |
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| CN201710965339.9A CN107690213B (en) | 2017-10-17 | 2017-10-17 | Non-isolated low-voltage non-flicker LED driving circuit |
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| CN107690213A CN107690213A (en) | 2018-02-13 |
| CN107690213B true CN107690213B (en) | 2024-05-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108650744B (en) * | 2018-06-27 | 2024-05-03 | 北京集创北方科技股份有限公司 | LED driving controller, LED driving circuit and LED light-emitting device |
| TWI674037B (en) * | 2018-06-27 | 2019-10-01 | 大陸商北京集創北方科技股份有限公司 | LED driver circuit supporting low voltage input and its control chip |
| EP3599795A1 (en) * | 2018-07-25 | 2020-01-29 | Valeo Iluminacion | Electronic device, method for controlling a lighting device and automotive lighting device |
| CN109068454B (en) * | 2018-10-30 | 2024-06-14 | 无锡恒芯微科技有限公司 | Improved PWM and DIM dimming driving circuit |
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