CN106879102B - BUCK type LED driving chip - Google Patents
BUCK type LED driving chip Download PDFInfo
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- CN106879102B CN106879102B CN201510916413.9A CN201510916413A CN106879102B CN 106879102 B CN106879102 B CN 106879102B CN 201510916413 A CN201510916413 A CN 201510916413A CN 106879102 B CN106879102 B CN 106879102B
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- 238000007781 pre-processing Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 10
- 239000002699 waste material Substances 0.000 abstract description 4
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- 238000000034 method Methods 0.000 description 8
- 101100501772 Arabidopsis thaliana ESR2 gene Proteins 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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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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Abstract
The invention discloses a BUCK type LED driving chip, which comprises an output MOS tube and a short-circuit protection circuit, wherein the short-circuit protection circuit comprises a short-circuit protection comparator, the BUCK type LED driving chip also comprises a starting prejudgment module, an input signal of the starting prejudgment module is a grid signal of the output MOS tube, an output signal of the starting prejudgment module is used for controlling the enabling of the short-circuit protection comparator, the starting prejudgment module is used for controlling the short-circuit protection comparator to be switched off when the frequency of the grid signal of the output MOS tube is lower than a preset frequency, and the short-circuit protection comparator to be switched on when the frequency of the grid signal of the output MOS tube is larger than or equal to the preset frequency. The invention avoids the problem of repeated restarting of the chip during starting by adding the starting prejudgment module, accelerates the starting speed of the chip, reduces the power waste, eliminates the possibility of flashing light during starting and prolongs the service life of the chip.
Description
Technical Field
The invention relates to the field of integrated circuit design, in particular to a BUCK (BUCK conversion circuit) type LED (light emitting diode) driving chip.
Background
The BUCK type LED driving chip needs a short-circuit protection function to prevent the LED driving chip from being damaged due to a short circuit of an external pin. As shown in fig. 1 to fig. 3, a short-circuit protection circuit is usually disposed inside the BUCK-type LED driving chip, and the short-circuit protection circuit includes a short-circuit protection comparator 11, which detects that the FB output is compared with a fixed reference voltage, and when the FB output is lower than the reference voltage and is maintained for a set time, a metal-oxide-semiconductor (semiconductor) field effect transistor (MOS transistor, or referred to as metal-insulator-semiconductor) M1 is turned on, and the output no longer provides a follow current to VCC, which is pulled down by other internal module currents, and when the VCC is reduced to an under-voltage protection value, the system is restarted. Such a short-circuit protection detection method causes a problem at the time of start-up.
If the LED driving chip is internally provided with no short-circuit protection circuit and has no short-circuit protection function, after the system is powered ON, the bus voltage charges the capacitor of the VCC pin through the starting resistor, when the VCC voltage rises to the starting threshold voltage VCC _ ON, the internal control circuit of the chip starts working, and the COMP voltage is quickly pulled up to the output starting threshold voltage V1. Then the LED driving chip starts to output the pulse signal, the system starts to work at a relatively low switching frequency, the COMP voltage gradually and slowly rises from the starting threshold V1, the peak current of the inductor rises along with the COMP voltage, therefore, the soft starting of the output LED current is realized, and the frequency of the output pulse signal is slowly increased until the LED driving chip normally works.
When the LED driving chip has a short-circuit protection function, after the system is powered ON and started, the bus voltage charges a capacitor of a VCC pin through a starting resistor, when the VCC voltage rises to a starting threshold voltage VCC _ ON, a control circuit in the chip starts working, the COMP voltage is quickly pulled up to an output opening V1, then the chip starts outputting a pulse signal with a lower frequency, and the FB voltage slowly rises along with the output. The FB voltage is lower than the fixed reference voltage value VRS, the output of the SHORT-circuit comparator 11 will open the MOS transistor M1 through the SHORT signal after a period of set time delay Td, VCC discharges through R2 and M1, the VCC voltage gradually drops until the undervoltage protection threshold VCC _ OFF, the undervoltage protection is triggered, the other modules will be turned OFF by the undervoltage protection signal, and the system starts the restart process. When VCC rises to a starting threshold voltage VCC _ ON again, a control circuit in the chip starts to work again, the COMP voltage is quickly pulled up to V1, then the chip starts to output a pulse signal with a lower frequency, the short-circuit protection comparator starts to work again, the FB voltage is still lower than a fixed reference voltage value VRS, the output of the short-circuit comparator 11 is delayed by a set value and then turns ON the MOS tube M1 again, VCC discharges through R2 and M1, the VCC voltage drops to an undervoltage protection threshold value VCC _ OFF again, the undervoltage protection signal turns OFF other modules again, and the system starts a restarting process again. The system is restarted repeatedly, as shown in fig. 3, VCC charges between VCC _ OFF and VCC _ ON repeatedly until FB rises to the fixed reference voltage value VRS, the short-circuit protection comparator 11 no longer pulls down VCC voltage by turning ON M1, and the system starts to operate normally. In this process, the output waveform is intermittent, and the VCC is repeatedly restarted, which not only delays the system starting process and wastes energy, but also increases the system instability and increases the possibility of flashing lights during starting.
Disclosure of Invention
The invention aims to overcome the defects that when a BUCK type LED driving chip in the prior art is powered on and started, a short-circuit protection circuit in the chip can cause repeated restarting of a system, so that the starting speed of the chip is slow, electricity is consumed, multiple times of unnecessary flashing is caused, and the service life of the chip is shortened, and provides the BUCK type LED driving chip which can accelerate the starting speed of the chip and prolong the service life.
The invention solves the technical problems through the following technical scheme:
the BUCK type LED driving chip is characterized by further comprising a starting prejudging module, an input signal of the starting prejudging module is a grid signal of the output MOS tube, an output signal of the starting prejudging module is used for controlling enabling of the short-circuit protection comparator, the starting prejudging module is used for controlling turning off of the short-circuit protection comparator when the frequency of the grid signal of the output MOS tube is lower than a preset frequency, and the short-circuit protection comparator is turned on when the frequency of the grid signal of the output MOS tube is larger than or equal to the preset frequency.
In the scheme, the output MOS tube is a device in the conventional BUCK type LED driving chip, the grid signal of the output MOS tube has the same frequency with the output signal of the chip and only has different levels, before the output signal of the chip is stable, the grid signal of the output MOS tube is used as an input signal of the starting prejudgment module, and the output signal of the starting prejudgment module controls the short-circuit protection comparator to be turned on and turned off after being processed by an internal circuit of the starting prejudgment module. Namely, the short-circuit protection comparator is turned off when the output of the chip is unstable after the BUCK type LED driving chip is electrified and started, and the short-circuit protection comparator is turned on after the chip works normally to recover the short-circuit protection function of the chip and enable the chip to work normally.
Preferably, the starting prejudging module comprises a level preprocessing module, a level holding module and a level comparing module; the level preprocessing module, the level holding module and the level comparison module are electrically connected in sequence, an input signal of the level preprocessing module is a grid signal of the output MOS tube, and an output signal of the level comparison module is used for controlling the enabling of the short-circuit protection comparator; the level preprocessing module is used for adjusting the level of a grid signal of the output MOS tube; the level holding module is used for controlling the level of the signal output to the level comparison module according to the level and the frequency of the output signal of the level preprocessing module; the level comparison module is used for comparing the output level of the level holding module with a reference level and outputting a comparison result.
In the scheme, the input level of the level preprocessing module is generally higher, and the input level is reduced by the level preprocessing module and output to the level holding module after phase adjustment is carried out according to needs. The level holding module is used for controlling the output level of the level holding module not to exceed the reference level of the level comparison module before the frequency of the output signal of the chip does not reach the preset value.
Preferably, the level keeping module comprises a charge-discharge control module and a charge-discharge module, and the charge-discharge control module is electrically connected with the charge-discharge module; the charge and discharge control module is used for controlling the charge and discharge module to charge or discharge according to the level of the output signal of the level preprocessing module; the level comparison module is used for comparing the output level of the charge-discharge module with a reference level and outputting a comparison result.
Preferably, the charge and discharge control module comprises a PMOS transistor and an NMOS transistor, the level preprocessing module outputs the voltage to the gate of the NMOS transistor and the gate of the PMOS transistor, the drain of the NMOS transistor and the drain of the PMOS transistor are electrically connected to the charge and discharge module, the NMOS transistor is used for controlling the discharge of the charge and discharge module, and the PMOS transistor is used for controlling the charge and discharge module to charge.
In the scheme, when the output of the level preprocessing module is at a high level, the NMOS tube is conducted, the PMOS tube is disconnected, so that the input of the charge-discharge module is low, and the charge-discharge module is controlled to discharge; when the output of the level preprocessing module is at a low level, the PMOS tube is conducted, the NMOS tube is disconnected, so that the input of the charge-discharge module is high, and the charge-discharge module is controlled to be charged at the moment.
Preferably, the charge-discharge module comprises a resistor and a capacitor, one end of the resistor is electrically connected with the charge-discharge control module, and the other end of the resistor is electrically connected with one end of the capacitor and outputs the voltage to the level comparison module; the other end of the capacitor is grounded.
Preferably, the level comparison module is a schmitt trigger.
Preferably, the predetermined frequency is 10 KHz.
The positive progress effects of the invention are as follows: the BUCK type LED driving chip provided by the invention is additionally provided with the starting prejudgment module on the basis of the existing chip, in the power-on starting process of the chip, the starting prejudgment module can control the short-circuit protection comparator to stop working before the output frequency of the chip reaches a preset value, and the short-circuit protection comparator is recovered to normally work after the chip is started, so that the problem of repeated restarting of a system is solved, the starting speed of the chip is increased, the power waste is reduced, the possibility of flashing a lamp during starting is eliminated, and the service life of the chip is prolonged.
Drawings
Fig. 1 is a schematic diagram of an internal module of a conventional BUCK-type LED driving chip.
Fig. 2 is a typical application diagram of a conventional BUCK-type LED driving chip.
Fig. 3 is a waveform diagram of a conventional BUCK-type LED driving chip in the circuit of fig. 2 during startup.
Fig. 4 is a schematic diagram of an internal module of the BUCK LED driving chip according to a preferred embodiment of the invention.
Fig. 5 is a schematic diagram of a circuit module of the start-up anticipation module in fig. 4.
Fig. 6 is a schematic circuit diagram of the start-up anticipation module shown in fig. 4.
Fig. 7 is a waveform diagram of the BUCK LED driving chip of fig. 4 when being started.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 4, a BUCK-type LED driving chip includes an output MOS transistor M8, a short-circuit protection circuit with a short-circuit protection comparator 11, and a start prejudging module 100, where an input signal of the start prejudging module 100 is a gate signal DRN of the output MOS transistor M8, an output signal of the start prejudging module 100 is used to control enabling of the short-circuit protection comparator 11, the start prejudging module 100 is used to control turning off the short-circuit protection comparator 11 when a frequency of the gate signal DRN of the output MOS transistor M8 is lower than a predetermined frequency of 10KHz, and turning on the short-circuit protection comparator 11 when a frequency of the gate signal DRN of the output MOS transistor M8 is greater than or equal to the predetermined frequency of 10 KHz.
As shown in fig. 5, in this embodiment, the start-up anticipation module 100 includes a level preprocessing module 501, a level holding module 502 and a level comparing module 503, where the level holding module 502 includes a charge and discharge control module 5021 and a charge and discharge module 5022. As shown in fig. 6, the level comparing module 503 is a schmitt trigger structure, the charge and discharge control module 5021 includes a PMOS transistor M2 and an NMOS transistor M3, and the charge and discharge module 5022 includes a resistor R1 and a capacitor C1. The level preprocessing module 501 performs level adjustment on the input DRN signal and reversely generates a DRNL signal to be output to the gates of the PMOS transistor M2 and the NMOS transistor M3, the drains of M2 and M3 are electrically connected to R1, the source of M3 is grounded, and the source of M2 is connected to VDD. The other end of the resistor R1 is connected to one end of the C1 to generate a VRC signal as an output signal of the schmitt trigger, which outputs the ENS signal as an enable signal of the short-circuit protection comparator 11.
The specific working process in the starting process of the BUCK type LED driving chip in the embodiment is as follows:
when the BUCK type LED driving chip is started, the frequency is low when a pulse signal is just started to be output, and the duty ratio of the pulse signal is also small. The gate driving signal DRN of the output MOS transistor M8 is converted by the level preprocessing module 501 to generate DRNL, and the level is converted from VCC to an internal low voltage level VDD, where DRN and DRNL are inverted. The level holding block 502 is charged and discharged by DRNL which is obtained by level-shifting the gate signal DRN of the output MOS transistor M8, and the output of the level holding block 502 is used as the input of the schmitt trigger. When the system starts to start, the gate signal DRN of the output MOS transistor M8 is initially 0, the output of the charge-discharge module 5022, that is, VRC is 0, the output of the schmitt trigger is 1, and the short-circuit protection comparator 11 is turned off; when COMP reaches an internal set comparison voltage, after the soft start process starts, the gate signal DRN of the output MOS transistor M8 is a low-frequency pulse switching signal and the duty ratio of the pulse signal is small, the charge-discharge module 5022 outputs a low VRC voltage which is not enough to reach the flip value of the schmitt trigger, the output of the schmitt trigger is kept at 1, and the short-circuit protection comparator 11 is kept off. When the starting is completed, the system starts to work normally, the frequency of the grid signal of the output MOS tube M8 is increased to be normal, the output of the charging and discharging module 5022 exceeds the threshold value of the Schmitt trigger, the output of the Schmitt trigger is turned to be 0, and the short-circuit protection comparator 11 starts to work normally, namely whether the output of the BUCK type LED driving chip is short-circuited or not can be detected.
As shown in fig. 7, a waveform schematic diagram of the BUCK type LED driving chip in this embodiment when started is shown, and the problem of repeated restarting of the chip when started is avoided by the start prejudging module 100, so that the chip starting speed is increased, the power waste is reduced, the possibility of flashing light when started is eliminated, and the service life of the chip is prolonged.
In this embodiment, the charging and discharging module 5022 is not limited to the RC charging and discharging circuit, and may be implemented by a capacitor alone, or may be another circuit with a charging and discharging function.
In this embodiment, the level comparison module 503 is not limited to a schmitt trigger, and may be a circuit module that can implement a voltage comparison function.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (6)
1. A BUCK type LED driving chip comprises an output MOS tube and a short-circuit protection circuit, wherein the short-circuit protection circuit comprises a short-circuit protection comparator, and the BUCK type LED driving chip is characterized by further comprising a starting prejudging module, an input signal of the starting prejudging module is a grid signal of the output MOS tube, an output signal of the starting prejudging module is used for controlling enabling of the short-circuit protection comparator, the starting prejudging module is used for controlling turning off the short-circuit protection comparator when the frequency of the grid signal of the output MOS tube is lower than a preset frequency, and turning on the short-circuit protection comparator when the frequency of the grid signal of the output MOS tube is larger than or equal to the preset frequency;
the starting prejudgment module comprises a level preprocessing module, a level holding module and a level comparison module;
the level preprocessing module, the level holding module and the level comparison module are electrically connected in sequence, an input signal of the level preprocessing module is a grid signal of the output MOS tube, and an output signal of the level comparison module is used for controlling the enabling of the short-circuit protection comparator;
the level preprocessing module is used for adjusting the level of a grid signal of the output MOS tube;
the level holding module is used for controlling the level of the signal output to the level comparison module according to the level and the frequency of the output signal of the level preprocessing module;
the level comparison module is used for comparing the output level of the level holding module with a reference level and outputting a comparison result.
2. The BUCK type LED driving chip as claimed in claim 1, wherein the level keeping module comprises a charge and discharge control module and a charge and discharge module, the charge and discharge control module is electrically connected with the charge and discharge module;
the charge and discharge control module is used for controlling the charge and discharge module to charge or discharge according to the level of the output signal of the level preprocessing module;
the level comparison module is used for comparing the output level of the charge-discharge module with a reference level and outputting a comparison result.
3. The BUCK type LED driver chip according to claim 2, wherein the charge/discharge control module includes a PMOS transistor and an NMOS transistor, the level pre-processing module outputs to a gate of the NMOS transistor and a gate of the PMOS transistor, a drain of the NMOS transistor and a drain of the PMOS transistor are electrically connected to the charge/discharge module, the NMOS transistor is configured to control the discharge of the charge/discharge module, and the PMOS transistor is configured to control the charge/discharge module to charge.
4. The BUCK type LED driving chip as claimed in claim 2, wherein the charge-discharge module comprises a resistor and a capacitor, one end of the resistor is electrically connected to the charge-discharge control module, and the other end of the resistor is electrically connected to one end of the capacitor and outputs the voltage to the level comparison module; the other end of the capacitor is grounded.
5. The BUCK type LED driver chip as claimed in any one of claims 1 to 4, wherein the level comparison module is a Schmitt trigger.
6. The BUCK type LED driving chip as claimed in claim 5, wherein the predetermined frequency is 10 KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510916413.9A CN106879102B (en) | 2015-12-10 | 2015-12-10 | BUCK type LED driving chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510916413.9A CN106879102B (en) | 2015-12-10 | 2015-12-10 | BUCK type LED driving chip |
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| CN106879102A CN106879102A (en) | 2017-06-20 |
| CN106879102B true CN106879102B (en) | 2020-04-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035673A (en) * | 2006-07-31 | 2008-02-14 | Canon Inc | Power supply unit |
| CN101673938A (en) * | 2009-09-29 | 2010-03-17 | 杭州士兰微电子股份有限公司 | Output short-circuit soft-restoration control circuit and application thereof in DC-DC converter |
| CN101888226A (en) * | 2009-05-14 | 2010-11-17 | 三洋电机株式会社 | Delay circuit |
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源系统有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
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2015
- 2015-12-10 CN CN201510916413.9A patent/CN106879102B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035673A (en) * | 2006-07-31 | 2008-02-14 | Canon Inc | Power supply unit |
| CN101888226A (en) * | 2009-05-14 | 2010-11-17 | 三洋电机株式会社 | Delay circuit |
| CN101673938A (en) * | 2009-09-29 | 2010-03-17 | 杭州士兰微电子股份有限公司 | Output short-circuit soft-restoration control circuit and application thereof in DC-DC converter |
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源系统有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
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| CN106879102A (en) | 2017-06-20 |
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