WO2014048157A1 - 一种led驱动装置及其驱动方法 - Google Patents

一种led驱动装置及其驱动方法 Download PDF

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Publication number
WO2014048157A1
WO2014048157A1 PCT/CN2013/078967 CN2013078967W WO2014048157A1 WO 2014048157 A1 WO2014048157 A1 WO 2014048157A1 CN 2013078967 W CN2013078967 W CN 2013078967W WO 2014048157 A1 WO2014048157 A1 WO 2014048157A1
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WIPO (PCT)
Prior art keywords
led
led light
string
group
comparator
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PCT/CN2013/078967
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English (en)
French (fr)
Inventor
陈小雨
陈博
邓迅升
张静
麦炎全
Original Assignee
深圳市晟碟半导体有限公司
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Application filed by 深圳市晟碟半导体有限公司 filed Critical 深圳市晟碟半导体有限公司
Priority to EP13840974.3A priority Critical patent/EP2890222B1/en
Priority to US14/666,368 priority patent/US9426859B2/en
Publication of WO2014048157A1 publication Critical patent/WO2014048157A1/zh

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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
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/28—Circuit arrangements for protecting against abnormal temperature
    • 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]

Definitions

  • the present invention relates to the field of LED lighting, and in particular to an LED driving device and a driving method thereof.
  • LED lighting is rapidly developing as a revolutionary energy-saving lighting technology.
  • LED is energy-saving and environmentally friendly, which is bound to be the future development trend.
  • the LED driver is the guarantee for the development of the LED industry chain.
  • the LED driver uses alternating current (AC) to direct current (DC) to drive the LED, but this driving method requires an inductor and an electrolytic capacitor device, wherein the electrolytic capacitor has a short life span, which seriously restricts the overall life of the LED driving circuit.
  • the use of the above drive circuit is not only costly, but also has low conversion efficiency, generally around 80%, which seriously affects the LED energy-saving lighting effect, making the stability of the system poor, and restricting the large-scale application of LED lighting.
  • an object of the present invention is to provide an LED driving device and a driving method thereof, which solve the defects of short life, low efficiency, and low stability in the prior art, thereby increasing product life. Improve drive efficiency, save costs and improve system stability.
  • An LED driving device comprising: a rectifier bridge for rectifying an input signal, at least one LED string, at least one LED group, at least one P-type switch module for driving an LED string, at least one An N-type driving module for driving the LED lamp group and a logic controller for controlling the P-type switch module and the N-type driving module; the number of the LED string is the same as the number of the P-type switch module; the LED lamp group The number is the same as the number of N-type drive modules;
  • the LED light string is connected in series with the LED light group; the anode of the LED light string is connected to the positive output end of the rectifier bridge, the negative output end of the rectifier bridge is grounded; the cathode of the LED light string is connected to the anode of the LED light group
  • the logic controller respectively connects the anode and the cathode of the LED light string through the P-type switch module; the logic controller connects the cathode of the LED light group through the N-type drive module; the logic controller is also connected to the negative input of the rectifier bridge end.
  • the LED driving device wherein the LED light string and the LED light group respectively comprise at least one LED or HV LED.
  • the LED driving device wherein the LED driving device comprises:
  • LED light strings respectively a first LED light string and a second LED light string
  • Two P-type switch modules are respectively a first P-type switch module and a second P-type switch module;
  • LED light groups respectively being a first LED light group, a second LED light group, a third LED light group and a fourth LED light group;
  • N-type driving modules respectively being a first N-type driving module, a second N-type driving module, a third N-type driving module and a fourth N-type driving module;
  • the first LED light string, the second LED light string, the first LED light group, the second LED light group, the third LED light group, and the fourth LED light group are sequentially connected; the anode connection of the first LED light string a positive output end of the rectifier bridge, the negative output end of the rectifier bridge is grounded; the logic controller is respectively connected to the anode and the cathode of the first LED light string through the first P-type switch module; the cathode of the first LED light string Connecting an anode of the second LED light string; the logic controller is respectively connected to the anode and the cathode of the second LED light string through the second P-type switch module; the cathode of the second LED light string is connected to the anode of the first LED light group a cathode of the first LED lamp group is connected to an anode of the second LED lamp group; the logic controller is connected to a cathode of the first LED lamp group through a first N-type driving module; and a cathode connection of the second LED lamp
  • the first N-type driving module comprises a first NMOS FET, a first resistor, a first comparator and a second comparator; a drain of the first NMOS FET Connecting a cathode of the first LED lamp group and an anode of the second LED lamp group; a gate of the first NMOS FET is connected to the logic controller; a source of the first NMOS FET is grounded through the first resistor, Also connecting a non-inverting input of the first comparator and a non-inverting input of the second comparator; an inverting input of the first comparator is coupled to the first reference voltage, and an output is coupled to the logic controller; the second comparator The inverting input terminal is connected to the second reference voltage, and the output end is connected to the logic controller;
  • the second N-type driving module includes a second NMOS FET, a second resistor, a third comparator, and a fourth comparator; a drain of the second NMOS FET is connected to a cathode of the second LED group and The anode of the third LED lamp group; the gate of the second NMOS FET is connected to the logic controller; the source of the second NMOS FET is grounded through the second resistor, and is also connected to the non-inverting input of the third comparator And an inverting input terminal of the fourth comparator; an inverting input terminal of the third comparator is connected to the first reference voltage, and an output terminal is connected to the logic controller; and an inverting input terminal of the fourth comparator is connected to the second reference Voltage, the output is connected to the logic controller;
  • the third N-type driving module includes a third NMOS FET, a third resistor, a fifth comparator, and a sixth comparator; a drain of the third NMOS FET is connected to a cathode of the third LED group and The anode of the fourth LED lamp group; the gate of the third NMOS FET is connected to the logic controller; the source of the third NMOS FET is grounded through the third resistor, and is also connected to the non-inverting input of the fifth comparator And a non-inverting input terminal of the sixth comparator; an inverting input end of the fifth comparator is connected to the first reference voltage, and an output end is connected to the logic controller; and an inverting input end of the sixth comparator is connected to the second reference Voltage, the output is connected to the logic controller;
  • the fourth N-type driving module includes a fourth NMOS FET, a fourth resistor, a seventh comparator, and an eighth comparator; a drain of the fourth NMOS FET is connected to a cathode of the fourth LED group; The gate of the fourth NMOS FET is connected to the logic controller; the source of the fourth NMOS FET is grounded through the fourth resistor, and is also connected to the in-phase input of the seventh comparator and the in-phase of the eighth comparator The input end; the inverting input end of the seventh comparator is connected to the first reference voltage, the output end is connected to the logic controller; the inverting input end of the eighth comparator is connected to the second reference voltage, and the output end is connected to the logic controller ;
  • the first P-type switch module includes: a first PMOS field effect transistor, a fifth NMOS field effect transistor, a fifth resistor, and a sixth resistor; a source of the first PMOS field effect transistor is connected to the first LED string An anode; a drain of the first PMOS field effect transistor is connected to a cathode of the first LED light string; a gate of the first PMOS field effect transistor is connected to a drain of the fifth NMOS FET, and is also connected through a sixth resistor An anode of the first LED string and a positive output of the rectifier bridge; a source of the fifth NMOS FET is grounded through a fifth resistor; a gate of the fifth NMOS FET is connected to a logic controller;
  • the second P-type switch module includes: a second PMOS field effect transistor, a sixth NMOS FET, a seventh resistor, and an eighth resistor; and a source of the second PMOS field effect transistor is connected to the second LED string An anode and a cathode of the first LED string; a drain of the second PMOS field effect transistor is connected to a cathode of the second LED string; a gate of the second PMOS field effect transistor is connected to a drain of the sixth NMOS field effect transistor And connecting an anode of the second LED string through an eighth resistor; a source of the sixth NMOS FET is grounded through a seventh resistor; a gate of the sixth NMOS FET is coupled to the logic controller.
  • the first N-type driving module comprises a first NPN transistor, a first resistor, a first comparator and a second comparator; a collector of the first NPN transistor is connected to the first LED a cathode of the lamp group and an anode of the second LED lamp group; a base of the first NPN transistor is connected to the logic controller; an emitter of the first NPN transistor is connected to the non-inverting input terminal of the first comparator and the second comparator The non-inverting input terminal is also grounded through a first resistor; the inverting input end of the first comparator is connected to the first reference voltage, the output end is connected to the logic controller; and the inverting input end of the second comparator is connected to the second Reference voltage, the output is connected to the logic controller;
  • the second N-type driving module includes a second NPN transistor, a second resistor, a third comparator, and a fourth comparator; a collector of the second NPN transistor is connected to a cathode of the second LED group and a third LED lamp a set of anodes; a base of the second NPN transistor connected to the logic controller; an emitter of the second NPN transistor connected to the non-inverting input of the third comparator and the non-inverting input of the fourth comparator, and also passed through the second The resistor is grounded; the inverting input terminal of the third comparator is connected to the first reference voltage, and the output terminal is connected to the logic controller; the inverting input terminal of the fourth comparator is connected to the second reference voltage, and the output terminal is connected to the logic controller ;
  • the third N-type driving module includes a third NPN transistor, a third resistor, a fifth comparator, and a sixth comparator; a collector of the third NPN transistor is connected to a cathode of the third LED group and a fourth LED lamp a set of anodes; a base of the third NPN transistor connected to the logic controller; an emitter of the third NPN transistor connected to the non-inverting input of the fifth comparator and the non-inverting input of the sixth comparator, and also through the third The resistor is grounded; the inverting input terminal of the fifth comparator is connected to the first reference voltage, the output terminal is connected to the logic controller; the inverting input terminal of the sixth comparator is connected to the second reference voltage, and the output terminal is connected to the logic controller ;
  • the fourth N-type driving module includes a fourth NPN transistor, a fourth resistor, a seventh comparator, and an eighth comparator; a collector of the fourth NPN transistor is connected to a cathode of the fourth LED lamp group; The base of the NPN transistor is connected to the logic controller; the emitter of the fourth NPN transistor is connected to the non-inverting input of the seventh comparator and the non-inverting input of the eighth comparator, and is also grounded through the fourth resistor; the seventh comparison The inverting input end of the device is connected to the first reference voltage, the output end is connected to the logic controller; the inverting input end of the eighth comparator is connected to the second reference voltage, and the output end is connected to the logic controller;
  • the first P-type switch module includes: a first PNP transistor, a fifth NMOS FET, a fifth resistor, and a sixth resistor; an emitter of the first PNP transistor is connected to an anode of the first LED string; a collector of the first PNP transistor is connected to a cathode of the first LED string; a base of the first PNP transistor is connected to a drain of the fifth NMOS field effect transistor, and an anode of the first LED string is also connected through a sixth resistor a positive output terminal of the rectifier bridge; a source of the fifth NMOS FET is grounded through a fifth resistor; a gate of the fifth NMOS FET is connected to a logic controller;
  • the second P-type switch module includes: a second PNP transistor, a sixth NMOS FET, a seventh resistor and an eighth resistor; an emitter of the second PNP transistor is connected to the anode of the second LED string and the first a cathode of the LED string; a collector of the second PNP transistor is connected to a cathode of the second LED string; a base of the second PNP transistor is connected to a drain of the sixth NMOS field effect transistor, and is also connected through an eighth resistor An anode of the second LED string; a source of the sixth NMOS FET is grounded through a seventh resistor; a gate of the sixth NMOS FET is coupled to a logic controller.
  • the LED driving device wherein the first LED light string, the second LED light string, the first LED light group, the second LED light group, the third LED light group, and the fourth LED light group are respectively LED or multiple HV
  • the LEDs are constructed in series.
  • the LED driving device further includes: an overvoltage protection module for overvoltage protection, an overtemperature protection module for overheat protection, and a voltage regulator; the overvoltage protection module, an overtemperature protection module, and a stable The voltage regulators are respectively connected to the logic controller.
  • a driving method using the above LED driving device wherein: the output voltage of the rectifier bridge changes with time, when the voltage amplitude is in the increasing phase, the number of LED lighting increases correspondingly; when the voltage amplitude is in the decreasing phase, the number of LED lighting Correspondingly reduced;
  • the N-type driving module controls the LED group to access the circuit, and as the output voltage continues to rise, P Type switch module controls LED light string access circuit;
  • the P-type switch module controls the LED string not to be connected to the circuit, and as the output voltage continues to decrease, the N-type drive The module controls the LED light group to not access the circuit.
  • the LED light string comprises a first LED light string and a second LED light string
  • the P-type switch module comprises a first P-type switch module and a second P-type switch module
  • the lamp group includes a first LED lamp group, a second LED lamp group, a third LED lamp group, and a fourth LED lamp group
  • the N-type driving module includes a first N-type driving module, a second N-type driving module, and a third N-type drive module and fourth N-type drive module;
  • the first N-type driving module controls the first LED light group to illuminate
  • the first P-type switching module controls the first LED light string to also illuminate; the voltage continues to rise.
  • the second P-type switch module controls the second LED light string to be lit.
  • the first LED light string, the second LED light string and the first LED light group are in a lighting state; as the voltage continues to rise, the first LED The light string and the second LED light string are extinguished, and the second N-type driving module controls the second LED light group to be lit, at which time the first LED light group and the second LED light group are in a lighting state; as the voltage continues to rise, The first LED light string is illuminated, at which time the first LED light group, the second LED light group and the first LED light string are in a lighting state; as the voltage continues to rise, the second LED light string is illuminated, at this time An LED light group, a second LED light group, a first LED light string and a second LED light string are in a lighting state; as the voltage continues to rise, the first LED light string and the second LED light string Off, the third LED light group is lit; and so on until the LED light string and the LED light group are all lit;
  • the second P-type switch module controls the second LED string to be extinguished, and as the output voltage continues to decrease, the first P-type switch module controls the first LED string to be extinguished, at which time the first LED group, The second LED light group, the third LED light group and the fourth LED light group are all in a lighting state; as the voltage continues to decrease, the fourth N-type driving module controls the fourth LED light group to be extinguished, the first LED light string and the first The second LED string is in a lit state; as the voltage continues to decrease, the second P-type switch module controls the second LED string to be extinguished; as the output voltage continues to decrease, the first P-type switch module controls the first LED string to be extinguished, At this time, the first LED lamp group, the second LED lamp group, and the third LED lamp group are
  • the LED driving device and the driving method thereof are provided by using a rectifier bridge, at least one LED string, at least one LED lamp group, at least one P-type switch module, and at least one N-type driving module.
  • a logic controller the LED light string is connected in series with the LED light group; the anode of the LED light string is connected to the positive output end of the rectifier bridge, the negative output end of the rectifier bridge is grounded; the cathode connection of the LED light string An anode of the LED lamp group; the logic controller respectively connects the anode and the cathode of the LED lamp string through the P-type switch module; the logic controller connects the cathode of the LED lamp group through the N-type drive module; the logic controller is also connected a negative input end of the rectifier bridge; the N-type drive module and the P-type switch module are controlled by the logic controller, so that when the voltage amplitude of the input signal rectified by the rectifier bridge is in a growth stage, the LED light string and the LED
  • FIG. 1 is a schematic structural view of an LED driving device according to the present invention.
  • FIG. 2 is a block diagram showing the structure of a first embodiment of an LED driving device according to the present invention.
  • FIG. 3 is a circuit schematic diagram of a first embodiment of an LED driving device of the present invention.
  • FIG. 4 is a circuit schematic diagram of a P-type switch module in a second embodiment of the LED driving device of the present invention.
  • FIG. 5 is a circuit schematic diagram of an N-type driving module in a second embodiment of the LED driving device of the present invention.
  • the present invention provides an LED driving device and a driving method thereof.
  • the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • FIG. 1 is a schematic structural view of an LED driving device according to the present invention.
  • the LED driving device provided by the invention comprises: a rectifier bridge 110, at least one LED light string 121, at least one LED light group 122, at least one P-type switch module 130, at least one N-type driving module 140 and a logic controller 150.
  • the LED light string 121 is connected in series with the LED light group 122; the anode of the LED light string 121 is connected to the positive output end of the rectifier bridge 110, the negative output end of the rectifier bridge 110 is grounded; the cathode of the LED light string 121 Connecting the anode of the LED lamp group 122; the logic controller 150 is respectively connected to the anode and the cathode of the LED lamp string 121 through the P-type switch module 130; the logic controller 150 is connected to the cathode of the LED lamp group 122 through the N-type driving module 140 The logic controller 150 is also coupled to the negative input of the rectifier bridge 110.
  • the number of the LED light strings 121 is at least one, and the number of the LED light groups 122 is at least one.
  • the LED light string 121 is connected in series with the LED light group 122, that is, the cathode of the LED light string 121 is connected to the anode of the LED light group 122. If there is more than one, the plurality of LED light strings 121 are connected in series, and the plurality of LED light groups are connected. 122 are connected in series, the two are also connected in series, and so on.
  • the LED light string 121 and the LED light group 122 are connected in series to form a long LED string 120.
  • the LED light string 121 and the LED light group 122 each include at least one LED or HV.
  • LED string 121 and LED group 122 are made up of multiple LEDs or HVs
  • the LEDs are constructed in series, and the polarity of the single LED string 121 or the LED group 122 is identical to that of a single diode due to the polarity of the diode.
  • the P-type switch module 130 is connected in parallel at both ends of the LED light string 121 for driving the LED light string 121 to be turned on and off.
  • the number of the LED light strings 121 is the same as the number of the P-type switch modules 130, and the number of the P-type switch modules 130 is in one-to-one correspondence with the number of the LED light strings 121.
  • the N-type driving module 140 is used to drive the LED lamp group 122 to be on and off.
  • the number of the LED lamp groups 122 is the same as the number of the N-type driving modules 140, and the number of the N-type driving modules 140 is in one-to-one correspondence with the number of the LED lamp groups 122.
  • the logic controller 150 is configured to control the P-type switch module 130 and the N-type drive module 140, thereby controlling the on and off of the LED light string 121 and the on and off of the LED light group 122, thereby controlling the number of lights of the LED light string 120. .
  • the LED driving device further includes: an over temperature protection module 160 , an over voltage protection module 170 , and a voltage regulator 180 .
  • the over-temperature protection module 160 is used for over-temperature protection of the driving device; the over-voltage protection module 170 is used for over-voltage protection of the driving device; and the voltage regulator 180 is used for voltage stabilization.
  • FIG. 2 is a structural block diagram of a first embodiment of an LED driving device according to the present invention.
  • the LED driving device comprises: two LED light strings, which are a first LED light string 12111 and a second LED light string 1212, respectively; two P-type switch modules, respectively a first P-type switch module 131 and a second P-type The switch module 132; the four LED light groups are respectively the first LED light group 1221, the second LED light group 1222, the third LED light group 1223 and the fourth LED light group 1224; four N-type driving modules, respectively An N-type driving module 141, a second N-type driving module 142, a third N-type driving module 143, and a fourth N-type driving module 144.
  • An anode of the first LED string 12111 is connected to a positive output end of the rectifier bridge 110, and a negative output end of the rectifier bridge 110 is grounded.
  • the logic controller 150 is respectively connected to the first LED lamp through the first P-type switch module 131.
  • the first P-type switch module 131 is connected in parallel at both ends of the first LED light string 12111 for driving the first LED light string 12111 to be turned on and off.
  • the logic controller 150 is configured to control an operating state of the first P-type switch module 131 to drive the on and off of the first LED string 12111.
  • the cathode of the first LED string 12111 is connected to the anode of the second LED string 1212; the logic controller 150 is connected to the anode and cathode of the second LED string 1212 via the second P-switch module 132, respectively.
  • the second P-type switch module 132 is connected in parallel across the second LED string 1212 for driving the second LED string 1212 to be turned on and off.
  • the logic controller 150 is configured to control an operating state of the second P-type switch module 132 to control the on and off of the second LED string 1212.
  • the cathode of the second LED light string 1212 is connected to the anode of the first LED light group 1221; the cathode of the first LED light group 1221 is connected to the anode of the second LED light group 1222; the logic controller 150 passes the first N
  • the type driving module 141 is connected to the cathode of the first LED lamp group 1221; the cathode of the second LED lamp group 1222 is connected to the anode of the third LED lamp group 1223; the logic controller 150 is also connected by the second N-type driving module 142.
  • the first N-type driving module 141 is configured to control the on and off of the first LED lamp group 1221.
  • the second N-type driving module 142 is configured to control the on and off of the second LED lamp group 1222.
  • the third N-type driving module 143 is configured to control the on and off of the third LED lamp group 1223.
  • the fourth N-type driving module 144 is configured to control the on and off of the fourth LED lamp group 1224.
  • the logic controller 150 is also coupled to the negative output of the rectifier bridge 110.
  • the logic controller 150 is configured to respectively control the working states of the first N-type driving module 141, the second N-type driving module 142, the third N-type driving module 143, and the fourth N-type driving module 144, thereby respectively controlling the first The LED lamp group 1221, the second LED lamp group 1222, the third LED lamp group 1223, and the fourth LED lamp group 1224 are turned on and off.
  • the first LED light string 12111, the second LED light string 1212, the first LED light group 1221, the second LED light group 1222, the third LED light group 1223, and the fourth LED light group 1224 are sequentially connected in series, that is, the first
  • the cathode of the LED string 12111 is coupled to the anode of the second LED string 1212
  • the cathode of the second LED string 1212 is coupled to the cathode of the first LED cluster 1221, and so on, to form a long string 120 of LED lamps. Due to the characteristics of the LEDs, the anodes of each LED string are connected in series in one direction.
  • the logic controller 150 controls the first P-type switch module 131, the second P-type switch module 132, the first N-type drive module 141, the second N-type drive module 142, and the third N-type.
  • the operating states of the driving module 143 and the fourth N-type driving module 144 are such that when the voltage value of the input signal rectified by the rectifier bridge 110 is in a growing phase, that is, the phase of the AC input of the input end of the rectifier bridge 110 is 0° ⁇ At 90° or 180° to 270°, during such a period of time, the output voltage of the rectifier bridge 110 rises from 0 to the highest voltage, and the LED lamp is lit in the long string 120 as the voltage increases.
  • the number of LED lamps is correspondingly increased; when the voltage value is in the falling phase, that is, the phase of the AC input of the input end of the rectifier bridge 110 is between 90° and 180° or 270° to 360°, the rectifier bridge 110 is in such a period of time.
  • the output voltage is reduced from the highest voltage to zero, and as the voltage is reduced, the number of LED lamps that are lit in the long string 120 of LED lamps is correspondingly reduced.
  • the first LED light string 12111, the second LED light string 1212, the first LED light group 1221, the second LED light group 1222, the third LED light group 1223, and the fourth LED light group 1224 are Multiple LEDs in series or multiple HVs
  • the LEDs are constructed in series.
  • the HV LED is a high voltage LED and will not be described in detail here.
  • the number of LEDs in the first LED light string 12111, the second LED light string 1212, the first LED light group 1221, the second LED light group 1222, the third LED light group 1223, and the fourth LED light group 1224 is at least one That is, the number of LEDs in all of the above LED string and LED group is a non-zero value.
  • the first LED string 12111 and the second LED string 1212 may be formed in series by different or the same number of LEDs.
  • the number of LEDs in the first LED light group 1221, the second LED light group 1222, the third LED light group 1223, and the fourth LED light group 1224 may be the same or different.
  • the number of LEDs of each LED light string and the LED light group is reasonably set, and the LED driving device can realize that the LED driving device increases the number of LEDs in the lighting state in a fixed step size when the voltage is increased; When the voltage is lowered, the number of LEDs that are lit is reduced in a fixed step size.
  • the rectifier bridge 110 is connected to the AC input terminal for rectifying the input AC power and converting the input AC voltage into an output unipolar AC voltage.
  • the input here is generally the mains, ie 220V AC.
  • the inside of the rectifier bridge is a bridge composed of four diodes, which is a prior art and will not be described in detail herein.
  • FIG. 3 is a circuit schematic diagram of a first embodiment of an LED driving device according to the present invention.
  • the first N-type driving module 141 includes a first NMOS FET M1, a first resistor R1, a first comparator Q1, and a second comparator Q2.
  • the drain of the first NMOS FET M1 is connected to the cathode of the first LED lamp group 1221 and the anode of the second LED lamp group 1222; the gate of the first NMOS FET M1 is connected to the G1 of the logic controller 150
  • the source of the first NMOS FET M1 is grounded through a first resistor R1, and the source of the first NMOS FET M1 is also connected to the non-inverting input of the first comparator Q1 and the second comparator Q2.
  • the inverting input terminal of the first comparator Q1 is connected to the first reference voltage Vref_h, the output terminal is connected to the OV_H_1 terminal of the logic controller 150; and the inverting input terminal of the second comparator Q2 is connected to the second terminal.
  • the reference voltage Vref_1 is connected to the OV_L_1 terminal of the logic controller 150.
  • the second N-type driving module 142 includes a second NMOS FET M2, a second resistor R2, a third comparator Q3, and a fourth comparator Q4.
  • the drain of the second NMOS FET M2 is connected to the cathode of the second LED lamp group 1222 and the anode of the third LED lamp group 1223; the gate of the second NMOS FET M2 is connected to the G2 of the logic controller 150.
  • the source of the second NMOS FET M2 is grounded through a second resistor R2, and the source of the second NMOS FET M2 is also connected to the non-inverting input of the third comparator Q3 and the fourth comparator Q4.
  • the inverting input terminal of the third comparator Q3 is connected to the first reference voltage Vref_h, the output terminal is connected to the OV_H_2 terminal of the logic controller 150; and the inverting input terminal of the fourth comparator Q4 is connected to the second terminal
  • the reference voltage Vref_1 is connected to the OV_L_2 terminal of the logic controller 150.
  • the third N-type driving module 143 includes a third NMOS FET M3, a third resistor R3, a fifth comparator Q5, and a sixth comparator Q6.
  • the drain of the third NMOS FET M3 is connected to the cathode of the third LED lamp group 1223 and the anode of the fourth LED lamp group 1224; the gate of the third NMOS FET M3 is connected to the G3 of the logic controller 150.
  • the source of the third NMOS FET M3 is grounded through a third resistor R3, and the source of the third NMOS FET M3 is also connected to the non-inverting input of the fifth comparator Q5 and the sixth comparator Q6.
  • the inverting input terminal of the fifth comparator Q5 is connected to the first reference voltage Vref_h, the output terminal is connected to the OV_H_3 terminal of the logic controller 150; and the inverting input terminal of the sixth comparator Q6 is connected to the second terminal
  • the reference voltage Vref_1 is connected to the OV_L_3 terminal of the logic controller 150.
  • the fourth N-type driving module 144 includes a fourth NMOS FET M4, a fourth resistor R4, a seventh comparator Q7, and an eighth comparator Q8.
  • the drain of the fourth NMOS FET M4 is connected to the cathode of the fourth LED lamp group 1224; the gate of the fourth NMOS FET M4 is connected to the G4 terminal of the logic controller 150; the fourth NMOS field effect
  • the source of the tube M4 is grounded through a fourth resistor R4, and the source of the fourth NMOS FET M4 is further connected to the non-inverting input of the seventh comparator Q7 and the non-inverting input of the eighth comparator Q8;
  • the inverting input terminal of the comparator Q7 is connected to the first reference voltage Vref_h, the output terminal is connected to the OV_H_4 terminal of the logic controller 150; the inverting input terminal of the eighth comparator Q8 is connected to the second reference voltage Vref_l, and the output terminal is connected to the logic
  • the circuits of the first N-type driving module 141, the second N-type driving module 142, the third N-type driving module 143, and the fourth N-type driving module 144 are the same. Further, in order to drive more LED lights to achieve better driving effects and lighting effects, the LED driving device can also increase the number of LED light groups and N-type driving modules. This is a simple transformation and will not be described in detail here.
  • the first P-type switch module 131 includes: a first PMOS field effect transistor P1, a fifth NMOS field effect transistor M5, a fifth resistor R5, and a sixth resistor R6; a source connection of the first PMOS field effect transistor P1 The anode of the first LED string 12111; the drain of the first PMOS field effect transistor P1 is connected to the cathode of the first LED lamp string 12111; the gate of the first PMOS field effect transistor P1 is connected to the fifth NMOS FET The drain of M5 is also connected to the anode of the first LED string 12111 and the positive output of the rectifier bridge 110 through a sixth resistor R6; the source of the fifth NMOS FET M5 is grounded through a fifth resistor R5; The gate of the fifth NMOS FET M5 is connected to the PG1 terminal of the logic controller 150.
  • the circuit of the second P-type switch module 132 is the same as that of the first P-type switch module 131.
  • the second P-type switch module 132 includes: a second PMOS field effect transistor P2, a sixth NMOS field effect transistor M6, a seventh resistor R7 and an eighth resistor R8; and a source connection of the second PMOS field effect transistor P2
  • the anode of the second LED string 1212 and the cathode of the first LED string 12111; the drain of the second PMOS field effect transistor P2 is connected to the cathode of the second LED string 1212 and the anode of the first LED lamp group 1221.
  • the gate of the second PMOS FET P2 is connected to the drain of the sixth NMOS FET M6, and is also connected to the anode of the second LED string 1212 and the cathode of the first LED string 12111 through the eighth resistor R8;
  • the source of the sixth NMOS FET M6 is grounded through a seventh resistor R7; the gate of the sixth NMOS FET M6 is connected to the PG2 terminal of the logic controller 150.
  • the circuits of the first P-type switch module 131 and the second P-type switch module 132 are the same. Further, in order to drive more LED lights and achieve better driving effects and lighting effects, the LED driving device can also increase the number of LED light strings and P-type switching modules. This is a simple transformation and will not be described in detail here.
  • FIG. 4 is a circuit schematic diagram of a P-type switch module in a second embodiment of the LED driving device of the present invention
  • FIG. 5 is an N-type driving device in the second embodiment of the LED driving device of the present invention.
  • the circuit schematic of the module. 3 and FIG. 4, the first PMOS field effect transistor P1 in the first P-type switch module 131 can be replaced by the PNP transistor P3.
  • connection mode is that the emitter of the PNP transistor P3 replaces the source access circuit of the first PMOS field effect transistor P1, and the collector of the PNP transistor P3 replaces the drain access circuit of the first PMOS field effect transistor P1, and the PNP transistor P3
  • the base level replaces the gate access circuit of the first PMOS FET P1.
  • similar replacements can be made in other P-type switch modules. This is a simple replacement for the circuit of a particular embodiment and will not be described in detail herein.
  • the alternative is to replace the PMOS field effect transistor with a PNP transistor, and the replaced P-type switch module can also achieve the same function, which belongs to the protection scope of the appended claims.
  • the first NMOS FET M1 in the first N-type driving module 141 is replaced by an NPN transistor M7.
  • the collector of the NPN transistor M7 is connected to the cathode of the first LED lamp group 1221 instead of the drain of the first NMOS FET M1; the base of the NPN transistor M7 is substituted for the gate connection logic controller of the first NMOS FET M1.
  • the G1 terminal of 150; the emitter of the NPN transistor M7 replaces the source access circuit of the first NMOS FET M1.
  • similar replacements can be made in other N-type driver modules. This is a simple replacement for the circuit of a particular embodiment and will not be described in detail herein.
  • the alternative is to replace the NMOS FET with an NPN transistor, and the replaced N-type driver module can also achieve the same function, which belongs to the protection scope of the appended claims.
  • the lowest Vds (drain and source voltage difference) withstand voltage of the first PMOS FET P1 is the voltage difference between the two ends when the first LED string 12111 is lit.
  • An example in which the LED in the first LED light string 12111 is an HV high voltage LED is described as an example, the HV The LED is generally composed of six LEDs with a power of 1W. The voltage drop is 18V, the lowest Vsb and Vdb are also 18V, and the lowest Vb_sub (substrate Bulk to substrate Substrate voltage) is 311V, in the actual process.
  • the MOS transistor can be integrated inside the chip, that is, the driving circuit can be further integrated, thereby reducing the circuit layout and occupying space, so that the LED driving device can do Smaller, so that the finished product can be made smaller, which greatly facilitates people's use.
  • the circuits of the first N-type driving module 141, the second N-type driving module 142, the third N-type driving module 143, and the fourth N-type driving module 144 are also the same.
  • the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are sampling resistors.
  • the first comparator Q1, the third comparator Q3, the fifth comparator Q5, and the seventh comparator Q7 are used for overcurrent detection to compare the voltage across the sampling resistor with its first reference voltage Vref_h.
  • the output of the first comparator Q1 when the current of the first resistor R1 exceeds a preset value, that is, the voltage of the sampling resistor is higher than the first reference voltage Vref_h, the output of the first comparator Q1 is high. Level, otherwise, output low.
  • the second comparator Q2, the fourth comparator Q4, the sixth comparator Q6, and the eighth comparator Q8 are used for undercurrent detection, and compare the voltage on the sampling resistor with the second reference voltage Vref_1.
  • the second comparator Q2 when the current of the second resistor R2 is lower than the set value, the output terminal of the second comparator Q2 outputs a high level, and otherwise outputs a low level.
  • the logic controller 150 controls the gate level state of each NMOS FET through the output signals of the comparator, that is, the output of the overcurrent detection and the undercurrent detection, thereby realizing the control of the brightness of each LED lamp group. Off.
  • the G1 ⁇ G4 terminals of the logic controller 150 are at a high level, and the PG1 terminal and the PG2 terminal are also at a high level, and the first NMOS FET is The fourth NMOS FET is in an on state, and the first PMOS FET P1 and the second PMOS FET P2 are in an off state.
  • the output voltage of the rectifier bridge 110 rises from 0 to the highest.
  • the specific principle flow of the high-efficiency LED driving device is as follows: when the output voltage of the rectifier bridge 110 is low, the first LED lamp group 1221 is lit, and current flows from the first LED lamp group 1221 into the first NMOS FET M1. As the output voltage of the rectifier bridge 110 increases, the current in the first LED lamp group 1221 gradually increases, and the voltage of the first resistor R1 of the first NMOS field effect transistor M1 is gradually increased.
  • the first comparator Q1 compares the sampling voltage with the first reference voltage Vref_h, and outputs a high level, that is, the OV_H_1 terminal of the logic controller 150 is at a high level.
  • the logic controller 150 sets the PG1 terminal to a low level according to the detected high level of the OV_H_1 terminal, so that the first PMOS field effect transistor P1 is in an off state, thereby causing the first LED light string 1211 to be connected to the circuit.
  • the LED that is lit at this time includes the first LED light string 1211 and the first LED light group 1221. As the voltage continues to rise, the current flowing through the LED string 120 continues to increase.
  • the PG2 terminal is set low, so that the second PMOS field effect transistor P2 In the off state, the second LED string 1212 is illuminated to emit light, then the LED that is lit at this time includes the first LED string 1211, the second LED string 1212, and the first LED group 1221.
  • the logic controller 150 sets the G1 terminal to a low level, and sets the PG1 terminal and the PG2 terminal to a high level, and then the first The LED light group 1221 and the second LED light group 1222 are in an illuminated state while the first LED light string 1211 and the second LED light string 1212 are in an off state.
  • the OV_H_2 terminal of the logic controller 150 is at a high level.
  • the logic controller 150 sets the PG1 terminal to a low level, the first LED light string 1211 is illuminated.
  • the OV_H_2 terminal of the logic controller 150 is changed to the low level due to the voltage division of the first LED light string 1211. .
  • the logic controller 150 sets the PG2 terminal to a low level, thereby lighting the second LED string 1212, at which time the OV_H_2 terminal of the logic controller 150 is again Goes low.
  • the LEDs that are lit at this time include a first LED light string 1211, a second LED light string 1212, a first LED light group 1221, and a second LED light group 1222.
  • the logic controller 150 sets the G2 terminal to a low level, and the PG1 terminal and the PG2 terminal are set to a high level, and the first LED lamp group 1221
  • the second LED light group 1222 and the third LED light group 1223 are in an illuminated state, while the first LED light string 1211 and the second LED light string 1212 are in an off state.
  • the remaining LEDs are illuminated in sequence.
  • the output voltage of the rectifier bridge 110 is reduced from the highest voltage to zero during such a period of time.
  • the output voltage of the rectifier bridge 110 reaches a certain voltage value, for example, the LED lamp long string 120 is illuminated after reaching a higher voltage value, and the current flows from the LED lamp long string 120 into the fourth N-type driving module 144.
  • the output voltage of the rectifier bridge 110 decreases, the output current gradually decreases, and the sampling resistance of the source of the fourth NMOS FET M4, that is, the voltage on the fourth resistor R4 gradually decreases, when the sampling voltage is smaller than the seventh comparator Q7.
  • the second reference voltage Vref_1, the OV_L_4 end of the logic controller 150 is low level
  • the logic control 150 is low according to the OV_L_4 terminal
  • the G4 terminal, the PG1 terminal and the PG2 terminal are set to a low level
  • the fourth LED lamp group 1224 is in an off state
  • the first LED lamp string 1211, the second LED lamp string 1212, the first LED lamp group 1221, the second LED lamp group 1222, and the third LED lamp group 1223 are in a bright state. Since the number of LEDs in the bright state decreases, the OV_L_4 terminal of the logic controller 150 becomes a high level.
  • the logic controller 150 sets the PG1 terminal to a high level, so that the first LED light string 1211 is in an off state, and the OV_L_4 terminal returns to a high level.
  • the OV_L_4 terminal outputs a low level, and the logic controller 150 sets the PG2 terminal to a high level, so that the second LED light string 1212 is in an off state, and the OV_L_4 returns to a high level.
  • the first LED light group 1221, the second LED light group 1222, and the third LED light group 1223 are in a bright state.
  • the logic controller 150 sets the G3 terminal to a low level, and sets the PG1 terminal and the PG2 terminal to a low level, and the third LED lamp group 1223 and the fourth LED lamp.
  • Group 1224 is in an off state, while first LED string 1211, second LED string 1212, first LED group 1221, and second LED group 1222 are in a bright state. By analogy, the remaining LED lights are sequentially extinguished.
  • the current value of the inverting input terminal of the comparator connected to the first reference voltage Vref_h is set to 10 mA
  • the current value of the inverting input terminal of the comparator connected to the second reference voltage Vref_1 is set to 50 mA.
  • the NMOS FET and the sampling resistor in the N-type driver module constitute a current source circuit.
  • the maximum current set by the current source circuit is 60 mA, which is higher than the overcurrent set by the first reference voltage Vref ⁇ _h. Current is 50mA.
  • the current in the first LED group 1221 gradually increases, and the voltage at the upper end of the first resistor R1 also increases.
  • the voltage of the upper end of the first resistor R1 is higher than the first reference voltage Vref_h
  • the current in the first LED lamp group 1221 is greater than 50 mA.
  • the voltage of the drain of the first NMOS FET M1 will be very low, close to the voltage at the upper end of the first resistor R1, and then the first LED string 1211 is lit. At this time, the first LED light string 1211 and the first LED light group 1221 are in a state of being lit.
  • the number of LEDs of the access circuit suddenly increases, the current flowing through the long string 120 of LED lamps is reduced.
  • the number of LEDs can be increased relative to the number of LEDs.
  • the number of LEDs that are already in a bright state does not exceed a certain upper limit of the ratio, thereby ensuring that the brightness of the LED string long string 120 is not too low, for example, the upper limit of the selectable ratio is 1/3 or 1/4.
  • the number of LED reductions does not exceed a certain percentage upper limit with respect to the number of LEDs that are already in a bright state, thereby ensuring that the brightness of the LED light string 120 does not change too fast and suddenly becomes bright.
  • the high-efficiency LED driving device provided by the present invention, as the voltage increases, the current in the LED string increases, and the voltage at the upper end of the sampling resistor rises.
  • the current in the LED string is always less than the maximum current of the current source of 60 mA, the voltages of the drains of the first NMOS to the sixth NMOS M6 are always close to the voltage at the upper end of the sampling resistor.
  • the power consumption of the driving module can be ensured to be around 75 mW, thereby greatly improving the efficiency of the driving device.
  • the present invention also provides an LED driving method, comprising: a rectifier bridge output voltage changes with time, when the voltage amplitude is in a growth phase, the number of LED lighting increases correspondingly; when the voltage amplitude is in a decreasing phase, the LED is bright The number of lamps is correspondingly reduced; when the voltage amplitude is in the increasing phase, for example, when the LED string and the LED lamp group are not lit, as the output voltage increases, the N-type driving module controls the LED lamp group to access the circuit, with the output The voltage continues to rise, and the P-type switch module controls the LED string to be connected to the circuit; when the voltage amplitude is in the lowering stage, for example, when both the LED string and the LED group are lit; as the output voltage decreases, the P-type switch module controls The LED string is not connected to the circuit. As the output voltage continues to decrease, the N-type driver module controls the LED group to not access the circuit.
  • the LED light string includes a first LED light string and a second LED light string
  • the P-type switch module includes a first P-type switch module and a second P-type switch module
  • the LED light group includes the first The LED lamp group, the second LED lamp group, the third LED lamp group and the fourth LED lamp group
  • the N-type driving module comprises a first N-type driving module, a second N-type driving module, a third N-type driving module and a fourth N-type drive module
  • the first N-type driving module controls the first LED lamp group to illuminate, and as the output voltage continues to rise, the first P-type switch module controls the first LED string to illuminate; the voltage continues to rise.
  • the second P-type switch module controls the second LED light string to be lit, at which time the first LED light string, the second LED light string and the first LED light group are in a lighting state; as the voltage continues to rise, the first The LED string and the second LED string are extinguished, and the second N-type driving module controls the second LED group to illuminate, at which time the first LED group and the second LED group are lit; as the voltage continues to rise The first LED light string is lit. At this time, the first LED light group, the second LED light group and the first LED light string are in a lighting state; as the voltage continues to rise, the second LED light string is lit.
  • the first LED light group, the second LED light group, the first LED light string and the second LED light string are in a lighting state; as the voltage continues to rise, the first LED light string and the second LED The light string is extinguished, the third LED light group is lit; and so on until the LED light string and the LED light group are all lit;
  • the second P-type switch module controls the second LED string to be extinguished, and as the output voltage continues to decrease, the first P-type switch module controls the first LED string to be extinguished, at which time the first LED group The second LED light group, the third LED light group and the fourth LED light group are all in a lighting state; as the voltage continues to decrease, the fourth N-type driving module controls the fourth LED light group to be extinguished, the first LED light string and The second LED string is in a lit state; as the voltage continues to decrease, the second P-type switch module controls the second LED string to be extinguished; as the output voltage continues to decrease, the first P-type switch module controls the first LED string to be extinguished At this time, the first LED lamp group, the second LED lamp group, and the third LED lamp group are
  • the LED driving device and the driving method thereof are provided by using a rectifier bridge, at least one LED string, at least one LED lamp group, at least one P-type switch module, at least one N-type driving module and logic a controller;
  • the LED light string is connected in series with the LED light group;
  • the anode of the LED light string is connected to the positive output end of the rectifier bridge, the negative output end of the rectifier bridge is grounded;
  • the cathode of the LED light string is connected to the LED light a set of anodes;
  • the logic controller is respectively connected to an anode and a cathode of the LED light string through a P-type switch module;
  • the logic controller is connected to a cathode of the LED light group through an N-type drive module;
  • the logic controller is further connected to the rectifier bridge
  • the negative input terminal is such that when the voltage value of the input signal rectified by the rectifier bridge is in a increasing phase, the number of LED lamps lit in the long string of the LED lamp increases
  • the LED driving device provided by the invention does not need inductors and electrolytic capacitors, saves cost, improves system stability, and increases the overall life of the driving device. At the same time, the driving efficiency is improved by special control methods.
  • the driving device can increase the number of LEDs in a bright state in a certain step time during a period in which the voltage is raised; , to reduce the number of LEDs in the bright state in a certain step size.
  • the LED driving device provided by the invention adjusts the current in the LED at any time according to the change of the voltage, ensures that most of the AC alternating voltage is applied to the LED wick, greatly improves the utilization efficiency, and improves the use efficiency of the LED chip.

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Abstract

LED驱动装置及其驱动方法，包括：整流桥（110）、至少一LED灯串（121）、至少一LED灯组（122）、至少一P型开关模块（130）、至少一N型驱动模块（140）和逻辑控制器（150）；所述LED灯串（121）与LED灯组（122）串联连接；所述LED灯串（121）的阳极连接整流桥（110）的正输出端，所述整流桥（110）的负输出端接地；所述LED灯串（121）的阴极连接LED灯组（122）的阳极；所述逻辑控制器（150）通过P型开关模块（130）分别连接LED灯串（121）的阳极和阴极；所述逻辑控制器（150）通过N型驱动模块（140）连接LED灯组（122）的阴极；所述逻辑控制器（150）还连接整流桥（110）的负输入端；通过逻辑控制器（150）控制N型驱动模块（140）和P型开关模块（130），使得当经整流桥（110）整流后的输入信号的电压值处于增长阶段时，LED灯长串中点亮的LED灯数量相应增加；当电压值处于下降阶段时，LED灯长串中点亮的LED灯数量相应减少，从而提高了驱动装置的效率，易于在芯片内集成。

Description

一种LED驱动装置及其驱动方法
技术领域
本发明涉及LED照明领域，特别涉及一种LED驱动装置及其驱动方法。
背景技术
当前全球能源短缺的忧虑再度升高，如何节约能源是我们未来面临的重要的问题。在照明领域，LED照明作为一种革命性的节能照明技术，正在飞速发展。LED作为一种新型的绿色光源产品，节能环保，必然是未来发展的趋势，二十一世纪将进入以LED为代表的新型照明光源时代。而LED驱动是LED产业链发展的保障。
现有技术中，LED驱动采用交流（AC）转直流（DC）来驱动LED，但这种驱动方式需要电感及电解电容器件，其中电解电容寿命较短，严重制约了LED驱动电路的整体寿命。采用上述驱动电路不仅成本较高，而且转换效率低，一般在80%左右，这样严重影响了LED节能照明效果，使得系统的稳定性较差，制约了LED照明的大规模应用。
因而现有技术还有待改进和提高。
发明内容
鉴于上述现有技术的不足之处，本发明的目的在于提供一种LED驱动装置及其驱动方法，以解决现有技术中的寿命短、效率低和稳定性不高的缺陷，从而增加产品寿命，提高驱动效率，节约成本，提高系统的稳定性。
为了达到上述目的，本发明采取了以下技术方案：
一种LED驱动装置，其中，包括：用于对输入信号进行整流的整流桥、至少一LED灯串、至少一LED灯组、至少一用于驱动LED灯串的P型开关模块、至少一用于驱动LED灯组的N型驱动模块和用于控制P型开关模块及N型驱动模块的逻辑控制器；所述LED灯串的数量与P型开关模块的数量相同；所述LED灯组的数量与N型驱动模块的数量相同；
所述LED灯串与LED灯组串联连接；所述LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述LED灯串的阴极连接LED灯组的阳极；所述逻辑控制器通过P型开关模块分别连接LED灯串的阳极和阴极；所述逻辑控制器通过N型驱动模块连接LED灯组的阴极；所述逻辑控制器还连接整流桥的负输入端。
所述的LED驱动装置，其中，所述LED灯串和LED灯组分别包括至少一颗LED或HV LED。
所述的LED驱动装置，其中，所述LED驱动装置包括：
2个LED灯串，分别为第一LED灯串和第二LED灯串；
2个P型开关模块，分别为第一P型开关模块和第二P型开关模块；
4个LED灯组，分别为第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组；
4个N型驱动模块，分别为第一N型驱动模块、第二N型驱动模块、第三N型驱动模块和第四N型驱动模块；
所述第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组依次连接；所述第一LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述逻辑控制器通过第一P型开关模块分别连接第一LED灯串的阳极和阴极；所述第一LED灯串的阴极连接第二LED灯串的阳极；所述逻辑控制器通过第二P型开关模块分别连接第二LED灯串的阳极和阴极；所述第二LED灯串的阴极连接第一LED灯组的阳极；所述第一LED灯组的阴极连接第二LED灯组的阳极；所述逻辑控制器通过第一N型驱动模块连接第一LED灯组的阴极；所述第二LED灯组的阴极连接第三LED灯组的阳极；所述逻辑控制器通过第二N型驱动模块连接第二LED灯组的阴极；所述第三LED灯组的阴极连接第四LED灯组的阳极；所述逻辑控制器通过第三N型驱动模块连接第三LED灯组的阴极；所述逻辑控制器通过第四N型驱动模块连接第四LED灯组的阴极。
所述的LED驱动装置，其中，所述第一N型驱动模块包括第一NMOS场效应管、第一电阻、第一比较器和第二比较器；所述第一NMOS场效应管的漏极连接第一LED灯组的阴极和第二LED灯组的阳极；所述第一NMOS场效应管的栅极连接逻辑控制器；所述第一NMOS场效应管的源极通过第一电阻接地，还连接第一比较器的同相输入端和第二比较器的同相输入端；所述第一比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第二比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第二N型驱动模块包括第二NMOS场效应管、第二电阻、第三比较器和第四比较器；所述第二NMOS场效应管的漏极连接第二LED灯组的阴极和第三LED灯组的阳极；所述第二NMOS场效应管的栅极连接逻辑控制器；所述第二NMOS场效应管的源极通过第二电阻接地，还连接第三比较器的同相输入端和第四比较器的同相输入端；所述第三比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第四比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第三N型驱动模块包括第三NMOS场效应管、第三电阻、第五比较器和第六比较器；所述第三NMOS场效应管的漏极连接第三LED灯组的阴极和第四LED灯组的阳极；所述第三NMOS场效应管的栅极连接逻辑控制器；所述第三NMOS场效应管的源极通过第三电阻接地，还连接第五比较器的同相输入端和第六比较器的同相输入端；所述第五比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第六比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第四N型驱动模块包括第四NMOS场效应管、第四电阻、第七比较器和第八比较器；所述第四NMOS场效应管的漏极连接第四LED灯组的阴极；所述第四NMOS场效应管的栅极连接逻辑控制器；所述第四NMOS场效应管的源极通过第四电阻接地，还连接第七比较器的同相输入端和第八比较器的同相输入端；所述第七比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第八比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第一P型开关模块包括：第一PMOS场效应管、第五NMOS场效应管、第五电阻和第六电阻；所述第一PMOS场效应管的源极连接第一LED灯串的阳极；所述第一PMOS场效应管的漏极连接第一LED灯串的阴极；所述第一PMOS场效应管的栅极连接第五NMOS场效应管的漏极，还通过第六电阻连接第一LED灯串的阳极和整流桥的正输出端；所述第五NMOS场效应管的源极通过第五电阻接地；所述第五NMOS场效应管的栅极连接逻辑控制器；
所述第二P型开关模块包括：第二PMOS场效应管、第六NMOS场效应管、第七电阻和第八电阻；所述第二PMOS场效应管的源极连接第二LED灯串的阳极和第一LED灯串的阴极；所述第二PMOS场效应管的漏极连接第二LED灯串的阴极；所述第二PMOS场效应管的栅极连接第六NMOS场效应管的漏极，还通过第八电阻连接第二LED灯串的阳极；所述第六NMOS场效应管的源极通过第七电阻接地；所述第六NMOS场效应管的栅极连接逻辑控制器。
所述的LED驱动装置，其中，所述第一N型驱动模块包括第一NPN三极管、第一电阻、第一比较器和第二比较器；所述第一NPN三极管的集电极连接第一LED灯组的阴极和第二LED灯组的阳极；所述第一NPN三极管的基极连接逻辑控制器；所述第一NPN三极管的发射极连接第一比较器的同相输入端和第二比较器的同相输入端，还通过第一电阻接地；所述第一比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第二比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第二N型驱动模块包括第二NPN三极管、第二电阻、第三比较器和第四比较器；所述第二NPN三极管的集电极连接第二LED灯组的阴极和第三LED灯组的阳极；所述第二NPN三极管的基极连接逻辑控制器；所述第二NPN三极管的发射极连接第三比较器的同相输入端和第四比较器的同相输入端，还通过第二电阻接地；所述第三比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第四比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第三N型驱动模块包括第三NPN三极管、第三电阻、第五比较器和第六比较器；所述第三NPN三极管的集电极连接第三LED灯组的阴极和第四LED灯组的阳极；所述第三NPN三极管的基极连接逻辑控制器；所述第三NPN三极管的发射极连接第五比较器的同相输入端和第六比较器的同相输入端，还通过第三电阻接地；所述第五比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第六比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第四N型驱动模块包括第四NPN三极管、第四电阻、第七比较器和第八比较器；所述第四NPN三极管的集电极连接第四LED灯组的阴极；所述第四NPN三极管的基极连接逻辑控制器；所述第四NPN三极管的发射极连接第七比较器的同相输入端和第八比较器的同相输入端，还通过第四电阻接地；所述第七比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第八比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
所述第一P型开关模块包括：第一PNP三极管、第五NMOS场效应管、第五电阻和第六电阻；所述第一PNP三极管的发射极连接第一LED灯串的阳极；所述第一PNP三极管的集电极连接第一LED灯串的阴极；所述第一PNP三极管的基极连接第五NMOS场效应管的漏极，还通过第六电阻连接第一LED灯串的阳极和整流桥的正输出端；所述第五NMOS场效应管的源极通过第五电阻接地；所述第五NMOS场效应管的栅极连接逻辑控制器；
所述第二P型开关模块包括：第二PNP三极管、第六NMOS场效应管、第七电阻和第八电阻；所述第二PNP三极管的发射极连接第二LED灯串的阳极和第一LED灯串的阴极；所述第二PNP三极管的集电极连接第二LED灯串的阴极；所述第二PNP三极管的基极连接第六NMOS场效应管的漏极，还通过第八电阻连接第二LED灯串的阳极；所述第六NMOS场效应管的源极通过第七电阻接地；所述第六NMOS场效应管的栅极连接逻辑控制器。
所述的LED驱动装置，其中，所述第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组分别由多颗LED或多颗HV LED串联构成。
所述的LED驱动装置，其中，还包括：用于过压保护的过压保护模块、用于过热保护的过温保护模块和稳压器；所述过压保护模块、过温保护模块和稳压器分别连接逻辑控制器。
一种采用上述LED驱动装置的驱动方法，其中，包括：整流桥输出电压随时间变化，当电压幅度处于增长阶段时，LED亮灯数量相应增加；当电压幅度处于降低阶段时，LED亮灯数量相应减少；
当电压幅度处于增长阶段时，当LED灯串和LED灯组均未点亮时，随着输出电压升高，N型驱动模块控制LED灯组接入电路，随着输出电压继续升高，P型开关模块控制LED灯串接入电路；
当电压幅度处于降低阶段时，当LED灯串和LED灯组均点亮时；随着输出电压降低，P型开关模块控制LED灯串不接入电路，随着输出电压继续降低，N型驱动模块控制LED灯组不接入电路。
所述的驱动方法，其中，所述LED灯串包括第一LED灯串和第二LED灯串；所述P型开关模块包括第一P型开关模块和第二P型开关模块；所述LED灯组包括第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组；所述N型驱动模块包括第一N型驱动模块、第二N型驱动模块、第三N型驱动模块和第四N型驱动模块；
当电压幅度处于增长阶段时，当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均未点亮时，随着输出电压升高，第一N型驱动模块控制第一LED灯组点亮，随着输出电压继续升高，第一P型开关模块控制第一LED灯串也点亮；电压继续升高，第二P型开关模块控制第二LED灯串点亮，此时第一LED灯串、第二LED灯串和第一LED灯组处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第二N型驱动模块控制第二LED灯组点亮，此时第一LED灯组和第二LED灯组处于点亮状态；随着电压继续升高，第一LED灯串点亮，此时第一LED灯组、第二LED灯组和第一LED灯串处于点亮状态；随着电压继续升高，第二LED灯串点亮，此时第一LED灯组、第二LED灯组、第一LED灯串和第二LED灯串处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第三LED灯组点亮；以此类推至LED灯串和LED灯组全部点亮；
当电压幅度处于降低阶段时，当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态时；随着输出电压降低，第二P型开关模块控制第二LED灯串熄灭，随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态；随着电压继续降低，第四N型驱动模块控制第四LED灯组熄灭，第一LED灯串和第二LED灯串处于点亮状态；随着电压继续降低，第二P型开关模块控制第二LED灯串熄灭；随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组和第三LED灯组处于点亮状态；以此类推至LED灯串和LED灯组全部熄灭。
相较于现有技术，本发明提供的LED驱动装置及其驱动方法，由于采用了整流桥、至少一LED灯串、至少一LED灯组、至少一P型开关模块、至少一N型驱动模块和逻辑控制器；所述LED灯串与LED灯组串联连接；所述LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述LED灯串的阴极连接LED灯组的阳极；所述逻辑控制器通过P型开关模块分别连接LED灯串的阳极和阴极；所述逻辑控制器通过N型驱动模块连接LED灯组的阴极；所述逻辑控制器还连接整流桥的负输入端；通过逻辑控制器控制N型驱动模块和P型开关模块，使得当经整流桥整流后的输入信号的电压幅度处于增长阶段时，所述LED灯串和LED灯组组成的LED灯长串中点亮的LED灯数量相应增加；当电压值处于下降阶段时，所述LED灯长串中点亮的LED灯数量相应减少，从而提高了驱动装置的效率；并且采用本发明提供的LED驱动装置，易于在芯片内集成，不需要电感和电解电容，节约了成本，提高了系统的稳定性，增加了驱动装置的整体寿命。
附图说明
图1为本发明LED驱动装置的结构示意图。
图2为本发明LED驱动装置第一实施例的结构框图。
图3为本发明LED驱动装置第一实施例的电路原理图。
图4为本发明LED驱动装置第二实施例中P型开关模块的电路原理图。
图5为本发明LED驱动装置第二实施例中N型驱动模块的电路原理图。
具体实施方式
本发明提供一种LED驱动装置及其驱动方法，为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
请参阅图1，图1为本发明LED驱动装置的结构示意图。本发明提供的LED驱动装置包括：整流桥110、至少一LED灯串121、至少一LED灯组122、至少一P型开关模块130、至少一N型驱动模块140和逻辑控制器150。
所述LED灯串121与LED灯组122串联连接；所述LED灯串121的阳极连接整流桥110的正输出端，所述整流桥110的负输出端接地；所述LED灯串121的阴极连接LED灯组122的阳极；所述逻辑控制器150通过P型开关模块130分别连接LED灯串121的阳极和阴极；所述逻辑控制器150通过N型驱动模块140连接LED灯组122的阴极；所述逻辑控制器150还连接整流桥110的负输入端。
如图1所示，所述LED灯串121的数量为至少一个，所述LED灯组122的数量为至少一个。所述LED灯串121与LED灯组122串联连接，即LED灯串121的阴极连接LED灯组122的阳极，若数量不止一个，则多个LED灯串121串联连接，且多个LED灯组122串联连接，两者也串联连接，以此类推。所述LED灯串121和LED灯组122串联组成LED灯长串120。所述LED灯串121和LED灯组122均包括至少一颗LED或HV LED，一般来说，LED灯串121和LED灯组122由多颗LED或HV LED串联构成，由于二极管的极性，单个LED灯串121或LED灯组122的极性与单颗二极管一致。
所述P型开关模块130并联在LED灯串121的两端，用于驱动LED灯串121通断。所述LED灯串121的数量与P型开关模块130的数量相同，所述P型开关模块130的数量与LED灯串121的数量一一对应。所述N型驱动模块140用于驱动LED灯组122亮与灭。所述LED灯组122的数量与N型驱动模块140的数量相同，所述N型驱动模块140的数量与LED灯组122的数量一一对应。所述逻辑控制器150用于控制P型开关模块130及N型驱动模块140，从而控制LED灯串121的通断和LED灯组122的亮灭，从而控制LED灯长串120的亮灯数量。
进一步地，请继续参阅图1，所述LED驱动装置还包括：过温保护模块160、过压保护模块170和稳压器180。所述过温保护模块160用于对驱动装置进行过温保护；所述过压保护模块170用于对驱动装置进行过压保护；所述稳压器180用于稳压。这些在现有技术中已广泛应用，此处不做详细说明。
进一步地，请参阅图2，图2为本发明LED驱动装置第一实施例的结构框图。所述LED驱动装置包括：2个LED灯串，分别为第一LED灯串12111和第二LED灯串1212；2个P型开关模块，分别为第一P型开关模块131和第二P型开关模块132；4个LED灯组，分别为第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224；4个N型驱动模块，分别为第一N型驱动模块141、第二N型驱动模块142、第三N型驱动模块143和第四N型驱动模块144。
所述第一LED灯串12111的阳极连接整流桥110的正输出端，所述整流桥110的负输出端接地；所述逻辑控制器150通过第一P型开关模块131分别连接第一LED灯串12111的阳极和阴极。所述第一P型开关模块131并联在第一LED灯串12111的两端，用于驱动第一LED灯串12111通断。所述逻辑控制器150用于控制第一P型开关模块131的工作状态，从而驱动第一LED灯串12111的通断。
所述第一LED灯串12111的阴极连接第二LED灯串1212的阳极；所述逻辑控制器150通过第二P型开关模块132分别连接第二LED灯串1212的阳极和阴极。所述第二P型开关模块132并联在第二LED灯串1212两端，用于驱动第二LED灯串1212通断。所述逻辑控制器150用于控制第二P型开关模块132的工作状态，从而控制第二LED灯串1212的通断。
所述第二LED灯串1212的阴极连接第一LED灯组1221的阳极；所述第一LED灯组1221的阴极连接第二LED灯组1222的阳极；所述逻辑控制器150通过第一N型驱动模块141连接第一LED灯组1221的阴极；所述第二LED灯组1222的阴极连接第三LED灯组1223的阳极；所述逻辑控制器150还通过第二N型驱动模块142连接第二LED灯组1222的阴极；所述第三LED灯组1223的阴极连接第四LED灯组1224的阳极；所述逻辑控制器150还通过第三N型驱动模块143连接第三LED灯组1223的阴极；所述逻辑控制器150通过第四N型驱动模块144连接第四LED灯组1224的阴极。所述第一N型驱动模块141用于控制第一LED灯组1221的亮与灭。所述第二N型驱动模块142用于控制第二LED灯组1222的亮与灭。所述第三N型驱动模块143用于控制第三LED灯组1223的亮与灭。所述第四N型驱动模块144用于控制第四LED灯组1224的亮与灭。所述逻辑控制器150还连接整流桥110的负输出端。所述逻辑控制器150用于分别控制第一N型驱动模块141、第二N型驱动模块142、第三N型驱动模块143和第四N型驱动模块144的工作状态，从而分别控制第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224的亮与灭。
所述第一LED灯串12111、第二LED灯串1212、第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224依次串联连接，即第一LED灯串12111的阴极连接第二LED灯串1212的阳极，第二LED灯串1212的阴极连接第一LED灯组1221的阴极，……，以此类推，组成LED灯长串120。由于LED的特性，每个LED灯串串联时的阳极均朝一个方向连接。
在本实施例中，所述逻辑控制器150通过控制第一P型开关模块131、第二P型开关模块132、第一N型驱动模块141、第二N型驱动模块142、第三N型驱动模块143和第四N型驱动模块144的工作状态，使得当经整流桥110整流后的输入信号的电压值处于增长阶段时，即整流桥110的输入端的AC交流输入的相位在0°~90°或180°~270°时，在这样的时间段内，整流桥110的输出电压从0开始升高至最高电压，随着电压的升高，所述LED灯长串120中点亮的LED灯数量相应增加；当电压值处于下降阶段时，即整流桥110的输入端的AC交流输入的相位在90°~180°或270°~360°时，在这样的时间段内，整流桥110的输出电压从最高电压降低至0，随着电压的降低，所述LED灯长串120中点亮的LED灯数量相应减少。
在本实施例中，所述第一LED灯串12111、第二LED灯串1212、第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224由多颗LED串联或多颗HV LED串联构成。HV LED为高压LED，此处不再详述。
所述第一LED灯串12111、第二LED灯串1212、第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224中的LED数量为至少一个，即上述所有LED灯串和LED灯组中的LED数量为一非零值。
即所述第一LED灯串12111和第二LED灯串1212可由不同或相同数量的LED串联形成。所述第一LED灯组1221、第二LED灯组1222、第三LED灯组1223和第四LED灯组1224中的LED数量可以相同，也可以不相同。
优选地，合理设置各个LED灯串和LED灯组的LED数量，所述LED驱动装置可实现当电压升高时，所述LED驱动装置以固定的步长增加处于点亮状态的LED的数量；当电压降低时，以固定的步长减少处于点亮状态的LED的数量。
所述整流桥110连接交流输入端，用于对输入的交流电进行整流，将输入的交流电压转换为输出的单极性交流电压。此处输入一般为市电，即220V AC。整流桥内部是由四个二极管组成的桥路，此乃现有技术，此处不再详细说明。
进一步地，请参阅图3，图3为本发明LED驱动装置第一实施例的电路原理图。所述第一N型驱动模块141包括第一NMOS场效应管M1、第一电阻R1、第一比较器Q1和第二比较器Q2。所述第一NMOS场效应管M1的漏极连接第一LED灯组1221的阴极和第二LED灯组1222的阳极；所述第一NMOS场效应管M1的栅极连接逻辑控制器150的G1端；所述第一NMOS场效应管M1的源极通过第一电阻R1接地，所述第一NMOS场效应管M1的源极还连接第一比较器Q1的同相输入端和第二比较器Q2的同相输入端；所述第一比较器Q1的反相输入端连接第一基准电压Vref_h，输出端连接逻辑控制器150的OV_H_1端；所述第二比较器Q2的反相输入端连接第二基准电压Vref_l，输出端连接逻辑控制器150的OV_L_1端。
所述第二N型驱动模块142包括第二NMOS场效应管M2、第二电阻R2、第三比较器Q3和第四比较器Q4。所述第二NMOS场效应管M2的漏极连接第二LED灯组1222的阴极和第三LED灯组1223的阳极；所述第二NMOS场效应管M2的栅极连接逻辑控制器150的G2端；所述第二NMOS场效应管M2的源极通过第二电阻R2接地，所述第二NMOS场效应管M2的源极还连接第三比较器Q3的同相输入端和第四比较器Q4的同相输入端；所述第三比较器Q3的反相输入端连接第一基准电压Vref_h，输出端连接逻辑控制器150的OV_H_2端；所述第四比较器Q4的反相输入端连接第二基准电压Vref_l，输出端连接逻辑控制器150的OV_L_2端。
所述第三N型驱动模块143包括第三NMOS场效应管M3、第三电阻R3、第五比较器Q5和第六比较器Q6。所述第三NMOS场效应管M3的漏极连接第三LED灯组1223的阴极和第四LED灯组1224的阳极；所述第三NMOS场效应管M3的栅极连接逻辑控制器150的G3端；所述第三NMOS场效应管M3的源极通过第三电阻R3接地，所述第三NMOS场效应管M3的源极还连接第五比较器Q5的同相输入端和第六比较器Q6的同相输入端；所述第五比较器Q5的反相输入端连接第一基准电压Vref_h，输出端连接逻辑控制器150的OV_H_3端；所述第六比较器Q6的反相输入端连接第二基准电压Vref_l，输出端连接逻辑控制器150的OV_L_3端。
所述第四N型驱动模块144包括第四NMOS场效应管M4、第四电阻R4、第七比较器Q7和第八比较器Q8。所述第四NMOS场效应管M4的漏极连接第四LED灯组1224的阴极；所述第四NMOS场效应管M4的栅极连接逻辑控制器150的G4端；所述第四NMOS场效应管M4的源极通过第四电阻R4接地，所述第四NMOS场效应管M4的源极还连接第七比较器Q7的同相输入端和第八比较器Q8的同相输入端；所述第七比较器Q7的反相输入端连接第一基准电压Vref_h，输出端连接逻辑控制器150的OV_H_4端；所述第八比较器Q8的反相输入端连接第二基准电压Vref_l，输出端连接逻辑控制器150的OV_L_4端。
显然，所述第一N型驱动模块141、第二N型驱动模块142、第三N型驱动模块143和第四N型驱动模块144的电路相同。进一步地，为了驱动更多的LED灯，实现更好的驱动效果和照明效果，所述LED驱动装置还可以对应增加LED灯组和N型驱动模块的数量。此乃简单变换，此处不再进行详细说明。
请继续参阅图3。所述第一P型开关模块131包括：第一PMOS场效应管P1、第五NMOS场效应管M5、第五电阻R5和第六电阻R6；所述第一PMOS场效应管P1的源极连接第一LED灯串12111的阳极；所述第一PMOS场效应管P1的漏极连接第一LED灯串12111的阴极；所述第一PMOS场效应管P1的栅极连接第五NMOS场效应管M5的漏极，还通过第六电阻R6连接第一LED灯串12111的阳极和整流桥110的正输出端；所述第五NMOS场效应管M5的源极通过第五电阻R5接地；所述第五NMOS场效应管M5的栅极连接逻辑控制器150的PG1端。
所述第二P型开关模块132的电路与第一P型开关模块131的相同。所述第二P型开关模块132包括：第二PMOS场效应管P2、第六NMOS场效应管M6、第七电阻R7和第八电阻R8；所述第二PMOS场效应管P2的源极连接第二LED灯串1212的阳极和第一LED灯串12111的阴极；所述第二PMOS场效应管P2的漏极连接第二LED灯串1212的阴极和第一LED灯组1221的阳极；所述第二PMOS场效应管P2的栅极连接第六NMOS场效应管M6的漏极，还通过第八电阻R8连接第二LED灯串1212的阳极和第一LED灯串12111的阴极；所述第六NMOS场效应管M6的源极通过第七电阻R7接地；所述第六NMOS场效应管M6的栅极连接逻辑控制器150的PG2端。
显然，第一P型开关模块131和第二P型开关模块132的电路相同。进一步地，为了驱动更多的LED灯，实现更好的驱动效果和照明效果，所述LED驱动装置还可以对应增加LED灯串和P型开关模块的数量。此乃简单变换，此处不再进行详细说明。
进一步地，请一并参阅图4和图5，图4本发明LED驱动装置第二实施例中P型开关模块的电路原理图，图5为本发明LED驱动装置第二实施例中N型驱动模块的电路原理图。对比图3和图4可知，上述第一P型开关模块131中的第一PMOS场效应管P1可由PNP三极管P3替代。此时连接方式为PNP三极管P3的发射极代替第一PMOS场效应管P1的源极接入电路，PNP三极管P3的集电极代替第一PMOS场效应管P1的漏极接入电路，PNP三极管P3的基级代替第一PMOS场效应管P1的栅极接入电路。同理，在其他P型开关模块中也可进行类似的替换。这是对具体实施例电路的简单替换，此处不再详细描述。该替换方式即以PNP三极管代替PMOS场效应管，替换后的P型开关模块也可实现同样的功能，属于本发明所附的权利要求的保护范围。
对比图3和图5可知，上述第一N型驱动模块141中的第一NMOS场效应管M1由NPN三极管M7替换。NPN三极管M7的集电极代替第一NMOS场效应管M1的漏极连接第一LED灯组1221的阴极；所述NPN三极管M7的基极代替第一NMOS场效应管M1的栅极连接逻辑控制器150的G1端；所述NPN三极管M7的发射极代替所述第一NMOS场效应管M1的源极接入电路。同理，在其他N型驱动模块中也可进行类似的替换。这是对具体实施例电路的简单替换，此处不再详细描述。该替换方式即以NPN三极管代替NMOS场效应管，替换后的N型驱动模块也可实现同样的功能，属于本发明所附的权利要求的保护范围。
以下结合图3对本发明的原理进行详细说明。
在本实施例中，所述第一PMOS场效应管P1的最低Vds（漏极和源极电压差）耐受电压为第一LED灯串12111点亮时两端电压差。以所述第一LED灯串12111中的LED为HV高压LED为例进行说明，所述HV LED一般由6颗功率为1W的LED串联构成，那么其压降为18V，最低的Vsb和Vdb也为18V，最低的Vb_sub（衬底端Bulk至基板Substrate的电压）为311V，在实际的工艺中，可取更大的阈值，基于目前的半导体工艺，该MOS管可在芯片内部集成，即驱动电路可进一步进行集成，从而减少了电路布局以及占用的空间，使得所述LED驱动装置可以做的更小，进而使得成品可以做的更小，大大方便了人们的使用。
本发明实施例中，所述第一N型驱动模块141、第二N型驱动模块142、第三N型驱动模块143和第四N型驱动模块144的电路也相同。所述第一电阻R1、第二电阻R2、第三电阻R3和第四电阻R4均为采样电阻。所述第一比较器Q1、第三比较器Q3、第五比较器Q5和第七比较器Q7用于过流检测，将采样电阻上的电压与其第一基准电压Vref_h进行比较。以第一比较器Q1为例进行说明，当第一电阻R1的电流超过预先的设定值，即采样电阻的电压高于第一基准电压Vref_h，所述第一比较器Q1的输出端输出高电平，反之则输出低电平。所述第二比较器Q2、第四比较器Q4、第六比较器Q6和第八比较器Q8用于欠流检测，将采样电阻上的电压与第二基准电压Vref_l进行比较。以第二比较器Q2为例，当第二电阻R2的电流低于设定值时，则第二比较器Q2的输出端输出高电平，否则输出低电平。所述逻辑控制器150通过比较器的输出信号，即过流检测和欠流检测的输出结果，来控制各个NMOS场效应管的栅极电平状态，从而实现了控制各个LED灯组的亮与灭。
采用本发明提供的LED驱动装置，在上电复位后，所述逻辑控制器150的G1~G4端为高电平，并且PG1端和PG2端也为高电平，第一NMOS场效应管至第四NMOS场效应管处于开启状态，而第一PMOS场效应管P1和第二PMOS场效应管P2处于关断状态。
当交流输入的输入信号的相位处在0°~90°或180°~270°时，整流桥110的输出电压从0开始升高至最高。
所述高效LED驱动装置的具体原理流程如下：当整流桥110的输出电压较低时，第一LED灯组1221点亮，电流从第一LED灯组1221流入第一NMOS场效应管M1中。随着整流桥110的输出电压的升高，第一LED灯组1221中的电流逐渐增大，第一NMOS场效应管M1的源极连接的采样电阻即第一电阻R1的电压逐渐升高，第一比较器Q1将采样电压和第一基准电压Vref_h进行比较后，输出高电平即逻辑控制器150的OV_H_1端为高电平。然后所述逻辑控制器150根据检测到的OV_H_1端为高电平将PG1端置为低电平，使得第一PMOS场效应管P1处于关断状态，从而使得第一LED灯串1211接入电路点亮发光，那么此时点亮的LED包括第一LED灯串1211和第一LED灯组1221。随着电压继续升高，LED灯长串120中流过的电流继续增加，当逻辑控制器150的OV_H_1端再次为高电平时，将PG2端置为低电平，使得第二PMOS场效应管P2处于关断状态，从而使得第二LED灯串1212点亮发光，那么此时点亮的LED包括第一LED灯串1211、第二LED灯串1212和第一LED灯组1221。
随着电压再继续升高，逻辑控制器150的OV_H_1端为高电平时，所述逻辑控制器150将G1端置为低电平，将PG1端和PG2端置为高电平，则第一LED灯组1221和第二LED灯组1222处于点亮的状态而第一LED灯串1211和第二LED灯串1212处于灭态。随着电压升高，第一LED灯组1221和第二LED灯组1222中的电流逐渐增加，当第二NMOS场效应管M2的源极的采样电阻即第二电阻R2上的电压超过第一基准电压vref_h时，逻辑控制器150的OV_H_2端为高电平。逻辑控制器150将PG1端置为低电平，则点亮第一LED灯串1211，此时由于第一LED灯串1211的分压作用，使逻辑控制器150的OV_H_2端变为低电平。随着电压继续升高，当OV_H_2端再次变为高电平时，逻辑控制器150将PG2端置为低电平，从而点亮第二LED灯串1212，此时逻辑控制器150的OV_H_2端再次变为低电平。此时点亮的LED包括第一LED灯串1211、第二LED灯串1212、第一LED灯组1221和第二LED灯组1222。随着电压继续升高，OV_H_2端第三次变为高电平时，逻辑控制器150将G2端置为低电平，PG1端和PG2端置为高电平，则第一LED灯组1221、第二LED灯组1222和第三LED灯组1223处于点亮的状态，而第一LED灯串1211和第二LED灯串1212处于灭态。以此类推，依次点亮余下的LED灯组。
当交流输入的输入信号的相位处在90°~180°或270°~360°时，在这样的时间段内，整流桥110的输出电压从最高电压降至0。
当整流桥110的输出电压达到一定电压值时，譬如达到较高电压值后LED灯长串120均点亮，电流从LED灯长串120流入第四N型驱动模块144。随着整流桥110输出电压的降低，输出电流逐渐减小，第四NMOS场效应管M4的源极的采样电阻即第四电阻R4上的电压也逐渐降低，当采样电压小于第七比较器Q7的第二基准电压Vref_l时，所述逻辑控制器150的OV_L_4端为低电平，逻辑控制150根据OV_L_4端为低电平，并将G4端、将PG1端和PG2端置为低电平，则第四LED灯组1224处于灭态，第一LED灯串1211、第二LED灯串1212、第一LED灯组1221、第二LED灯组1222和第三LED灯组1223处于亮态。由于处于亮态的LED数量减小，逻辑控制器150的OV_L_4端变为高电平。当电压再降低时，OV_L_4端为低电平，所述逻辑控制器150将PG1端置为高电平，使得第一LED灯串1211处于灭态，同时OV_L_4端恢复到高电平。当电压继续降低时，OV_L_4端输出为低电平，所述逻辑控制器150将PG2端置为高电平，使得第二LED灯串1212处于灭态，同时OV_L_4恢复到高电平，此时第一LED灯组1221、第二LED灯组1222和第三LED灯组1223处于亮态。当电压接着下降时，OV_L_4端为低电平，逻辑控制器150将G3端置为低电平，将PG1端和PG2端置为低电平，则第三LED灯组1223和第四LED灯组1224处于灭态，而第一LED灯串1211、第二LED灯串1212、第一LED灯组1221和第二LED灯组1222处于亮态。以此类推，依次灭掉余下的LED灯。
在具体应用时，将与第一基准电压Vref_h相连的比较器的反相输入端的电流值设定为10mA，与第二基准电压Vref_l连接的比较器的反相输入端的电流值设定为50mA。在N型驱动模块中的NMOS场效应管和采样电阻构成电流源电路，在具体应用设计中，电流源电路设定的最大电流为60mA，高于第一基准电压Vref¬_h设定的过流电流50mA。
当前第一LED灯组1221处于点亮状态时，且电压处于升高的时间段时，第一LED灯组1221中的电流逐渐增加，第一电阻R1上端的电压也随之升高。当第一电阻R1上端的电压高于第一基准电压Vref_h时，则第一LED灯组1221中的电流大于50mA。此时由于恒流源的特性，第一NMOS场效应管M1的漏极的电压将非常低，接近于第一电阻R1上端的电压，然后第一LED灯串1211点亮。此时，共有第一LED灯串1211及第一LED灯组1221处于点亮的状态。由于接入电路的LED的数量突然增加，所以LED灯长串120中流过的电流减小，通过控制第一LED灯串1211及第二LED灯串1212的数量，可以保证LED增加的数量相对于已经处于亮态的LED的数量不超过一定的比例上限，从而保证LED灯长串120的亮度不致过低，譬如可选取的比例的上限为1/3或1/4等。同理，也保证了LED减少的数量相对于已经处于亮态的LED的数量不超过一定的比例上限，从而保证了LED灯长串120的亮度不致变化过快，突然变亮。
并且，采用本发明提供的高效LED驱动装置，随着电压的升高，LED灯串中的电流增加，采样电阻上端的电压升高。但由于LED灯串中的电流始终小于电流源的最大的电流60mA，所以第一NMOS场效应管M1至第六NMOS场效应管M6的漏极的电压始终接近采样电阻上端的电压。设计中采样电阻取为30ohm，则在驱动过程中驱动模块的功耗小于30ohm*50mA*50mA=75mW。同时采用上述方案，在电压从最低到最高、最高到最低的过程，通过合理的控制，可以保证驱动模块的功耗在75mW附近，从而极大提高了驱动装置的效率。
基于上述原理，本发明还提供了一种LED驱动方法，包括：整流桥输出电压随时间变化，当电压幅度处于增长阶段时，LED亮灯数量相应增加；当电压幅度处于降低阶段时，LED亮灯数量相应减少；当电压幅度处于增长阶段时，譬如当LED灯串和LED灯组均未点亮时，随着输出电压升高，N型驱动模块控制LED灯组接入电路，随着输出电压继续升高，P型开关模块控制LED灯串接入电路；当电压幅度处于降低阶段时，譬如当LED灯串和LED灯组均点亮时；随着输出电压降低，P型开关模块控制LED灯串不接入电路，随着输出电压继续降低，N型驱动模块控制LED灯组不接入电路。
进一步地，所述LED灯串包括第一LED灯串和第二LED灯串；所述P型开关模块包括第一P型开关模块和第二P型开关模块；所述LED灯组包括第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组；所述N型驱动模块包括第一N型驱动模块、第二N型驱动模块、第三N型驱动模块和第四N型驱动模块；
当电压幅度处于增长阶段时，譬如当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均未点亮时，随着输出电压升高，第一N型驱动模块控制第一LED灯组点亮，随着输出电压继续升高，第一P型开关模块控制第一LED灯串也点亮；电压继续升高，第二P型开关模块控制第二LED灯串点亮，此时第一LED灯串、第二LED灯串和第一LED灯组处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第二N型驱动模块控制第二LED灯组点亮，此时第一LED灯组和第二LED灯组处于点亮状态；随着电压继续升高，第一LED灯串点亮，此时第一LED灯组、第二LED灯组和第一LED灯串处于点亮状态；随着电压继续升高，第二LED灯串点亮，此时第一LED灯组、第二LED灯组、第一LED灯串和第二LED灯串处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第三LED灯组点亮；以此类推至LED灯串和LED灯组全部点亮；
当电压幅度处于降低阶段时，譬如当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态时；随着输出电压降低，第二P型开关模块控制第二LED灯串熄灭，随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态；随着电压继续降低，第四N型驱动模块控制第四LED灯组熄灭，第一LED灯串和第二LED灯串处于点亮状态；随着电压继续降低，第二P型开关模块控制第二LED灯串熄灭；随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组和第三LED灯组处于点亮状态；以此类推至LED灯串和LED灯组全部熄灭。
综上所述，本发明提供的LED驱动装置及其驱动方法，由于采用了整流桥、至少一LED灯串、至少一LED灯组、至少一P型开关模块、至少一N型驱动模块和逻辑控制器；所述LED灯串与LED灯组串联连接；所述LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述LED灯串的阴极连接LED灯组的阳极；所述逻辑控制器通过P型开关模块分别连接LED灯串的阳极和阴极；所述逻辑控制器通过N型驱动模块连接LED灯组的阴极；所述逻辑控制器还连接整流桥的负输入端，使得当经整流桥整流后的输入信号的电压值处于增长阶段时，LED灯长串中点亮的LED灯数量相应增加；当电压值处于下降阶段时，所述LED灯长串中点亮的LED灯数量相应减少，从而提高了驱动装置的效率；并且采用本发明提供的LED驱动装置，易于在芯片内集成，使得驱动装置占用空间小，易于小型化。
本发明提供的LED驱动装置不需要电感和电解电容，节约了成本，提高了系统的稳定性，增加了驱动装置的整体寿命。同时，通过特殊的控制方法来提高驱动效率。本发明通过设计不同的LED灯串中的LED数量以及控制方法，使得驱动装置在电压升高的时间段，还可以以一定的步长增加处于亮态的LED的数量；在电压降低的时间段，以一定的步长减小处于亮态的LED的数量。本发明提供的LED驱动装置，随电压的变化而随时调节LED中的电流，保证绝大部分AC交流电压施加在LED灯芯上，大大提高了利用效率，还提高了LED芯片的使用效率。
可以理解的是，对本领域普通技术人员来说，可以根据本发明的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本发明所附的权利要求的保护范围。

Claims (9)

  1. 一种LED驱动装置，其特征在于，包括：用于对输入信号进行整流的整流桥、至少一LED灯串、至少一LED灯组、至少一用于驱动LED灯串的P型开关模块、至少一用于驱动LED灯组的N型驱动模块和用于控制P型开关模块及N型驱动模块的逻辑控制器；所述LED灯串的数量与P型开关模块的数量相同；所述LED灯组的数量与N型驱动模块的数量相同；
    所述LED灯串与LED灯组串联连接；所述LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述LED灯串的阴极连接LED灯组的阳极；所述逻辑控制器通过P型开关模块分别连接LED灯串的阳极和阴极；所述逻辑控制器通过N型驱动模块连接LED灯组的阴极；所述逻辑控制器还连接整流桥的负输入端。
  2. 根据权利要求1所述的LED驱动装置，其特征在于，所述LED灯串和LED灯组分别包括至少一颗LED或HV LED。
  3. 根据权利要求1所述的LED驱动装置，其特征在于，所述LED驱动装置包括：
    2个LED灯串，分别为第一LED灯串和第二LED灯串；
    2个P型开关模块，分别为第一P型开关模块和第二P型开关模块；
    4个LED灯组，分别为第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组；
    4个N型驱动模块，分别为第一N型驱动模块、第二N型驱动模块、第三N型驱动模块和第四N型驱动模块；
    所述第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组依次连接；所述第一LED灯串的阳极连接整流桥的正输出端，所述整流桥的负输出端接地；所述逻辑控制器通过第一P型开关模块分别连接第一LED灯串的阳极和阴极；所述第一LED灯串的阴极连接第二LED灯串的阳极；所述逻辑控制器通过第二P型开关模块分别连接第二LED灯串的阳极和阴极；所述第二LED灯串的阴极连接第一LED灯组的阳极；所述第一LED灯组的阴极连接第二LED灯组的阳极；所述逻辑控制器通过第一N型驱动模块连接第一LED灯组的阴极；所述第二LED灯组的阴极连接第三LED灯组的阳极；所述逻辑控制器通过第二N型驱动模块连接第二LED灯组的阴极；所述第三LED灯组的阴极连接第四LED灯组的阳极；所述逻辑控制器通过第三N型驱动模块连接第三LED灯组的阴极；所述逻辑控制器通过第四N型驱动模块连接第四LED灯组的阴极。
  4. 根据权利要求3所述的LED驱动装置，其特征在于，所述第一N型驱动模块包括第一NMOS场效应管、第一电阻、第一比较器和第二比较器；所述第一NMOS场效应管的漏极连接第一LED灯组的阴极和第二LED灯组的阳极；所述第一NMOS场效应管的栅极连接逻辑控制器；所述第一NMOS场效应管的源极通过第一电阻接地，还连接第一比较器的同相输入端和第二比较器的同相输入端；所述第一比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第二比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第二N型驱动模块包括第二NMOS场效应管、第二电阻、第三比较器和第四比较器；所述第二NMOS场效应管的漏极连接第二LED灯组的阴极和第三LED灯组的阳极；所述第二NMOS场效应管的栅极连接逻辑控制器；所述第二NMOS场效应管的源极通过第二电阻接地，还连接第三比较器的同相输入端和第四比较器的同相输入端；所述第三比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第四比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第三N型驱动模块包括第三NMOS场效应管、第三电阻、第五比较器和第六比较器；所述第三NMOS场效应管的漏极连接第三LED灯组的阴极和第四LED灯组的阳极；所述第三NMOS场效应管的栅极连接逻辑控制器；所述第三NMOS场效应管的源极通过第三电阻接地，还连接第五比较器的同相输入端和第六比较器的同相输入端；所述第五比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第六比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第四N型驱动模块包括第四NMOS场效应管、第四电阻、第七比较器和第八比较器；所述第四NMOS场效应管的漏极连接第四LED灯组的阴极；所述第四NMOS场效应管的栅极连接逻辑控制器；所述第四NMOS场效应管的源极通过第四电阻接地，还连接第七比较器的同相输入端和第八比较器的同相输入端；所述第七比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第八比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第一P型开关模块包括：第一PMOS场效应管、第五NMOS场效应管、第五电阻和第六电阻；所述第一PMOS场效应管的源极连接第一LED灯串的阳极；所述第一PMOS场效应管的漏极连接第一LED灯串的阴极；所述第一PMOS场效应管的栅极连接第五NMOS场效应管的漏极，还通过第六电阻连接第一LED灯串的阳极和整流桥的正输出端；所述第五NMOS场效应管的源极通过第五电阻接地；所述第五NMOS场效应管的栅极连接逻辑控制器；
    所述第二P型开关模块包括：第二PMOS场效应管、第六NMOS场效应管、第七电阻和第八电阻；所述第二PMOS场效应管的源极连接第二LED灯串的阳极和第一LED灯串的阴极；所述第二PMOS场效应管的漏极连接第二LED灯串的阴极；所述第二PMOS场效应管的栅极连接第六NMOS场效应管的漏极，还通过第八电阻连接第二LED灯串的阳极；所述第六NMOS场效应管的源极通过第七电阻接地；所述第六NMOS场效应管的栅极连接逻辑控制器。
  5. 根据权利要求3所述的LED驱动装置，其特征在于，所述第一N型驱动模块包括第一NPN三极管、第一电阻、第一比较器和第二比较器；所述第一NPN三极管的集电极连接第一LED灯组的阴极和第二LED灯组的阳极；所述第一NPN三极管的基极连接逻辑控制器；所述第一NPN三极管的发射极连接第一比较器的同相输入端和第二比较器的同相输入端，还通过第一电阻接地；所述第一比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第二比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第二N型驱动模块包括第二NPN三极管、第二电阻、第三比较器和第四比较器；所述第二NPN三极管的集电极连接第二LED灯组的阴极和第三LED灯组的阳极；所述第二NPN三极管的基极连接逻辑控制器；所述第二NPN三极管的发射极连接第三比较器的同相输入端和第四比较器的同相输入端，还通过第二电阻接地；所述第三比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第四比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第三N型驱动模块包括第三NPN三极管、第三电阻、第五比较器和第六比较器；所述第三NPN三极管的集电极连接第三LED灯组的阴极和第四LED灯组的阳极；所述第三NPN三极管的基极连接逻辑控制器；所述第三NPN三极管的发射极连接第五比较器的同相输入端和第六比较器的同相输入端，还通过第三电阻接地；所述第五比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第六比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第四N型驱动模块包括第四NPN三极管、第四电阻、第七比较器和第八比较器；所述第四NPN三极管的集电极连接第四LED灯组的阴极；所述第四NPN三极管的基极连接逻辑控制器；所述第四NPN三极管的发射极连接第七比较器的同相输入端和第八比较器的同相输入端，还通过第四电阻接地；所述第七比较器的反相输入端连接第一基准电压，输出端连接逻辑控制器；所述第八比较器的反相输入端连接第二基准电压，输出端连接逻辑控制器；
    所述第一P型开关模块包括：第一PNP三极管、第五NMOS场效应管、第五电阻和第六电阻；所述第一PNP三极管的发射极连接第一LED灯串的阳极；所述第一PNP三极管的集电极连接第一LED灯串的阴极；所述第一PNP三极管的基极连接第五NMOS场效应管的漏极，还通过第六电阻连接第一LED灯串的阳极和整流桥的正输出端；所述第五NMOS场效应管的源极通过第五电阻接地；所述第五NMOS场效应管的栅极连接逻辑控制器；
    所述第二P型开关模块包括：第二PNP三极管、第六NMOS场效应管、第七电阻和第八电阻；所述第二PNP三极管的发射极连接第二LED灯串的阳极和第一LED灯串的阴极；所述第二PNP三极管的集电极连接第二LED灯串的阴极；所述第二PNP三极管的基极连接第六NMOS场效应管的漏极，还通过第八电阻连接第二LED灯串的阳极；所述第六NMOS场效应管的源极通过第七电阻接地；所述第六NMOS场效应管的栅极连接逻辑控制器。
  6. 根据权利要求3所述的LED驱动装置，其特征在于，所述第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组分别由多颗LED或多颗HV LED串联构成。
  7. 根据权利要求1所述的LED驱动装置，其特征在于，还包括：用于过压保护的过压保护模块、用于过热保护的过温保护模块和稳压器；所述过压保护模块、过温保护模块和稳压器分别连接逻辑控制器。
  8. 一种采用权利要求1所述LED驱动装置的驱动方法，其特征在于，包括：整流桥输出电压随时间变化，当电压幅度处于增长阶段时，LED亮灯数量相应增加；当电压幅度处于降低阶段时，LED亮灯数量相应减少；
    当电压幅度处于增长阶段时，当LED灯串和LED灯组均未点亮时，随着输出电压升高，N型驱动模块控制LED灯组接入电路，随着输出电压继续升高，P型开关模块控制LED灯串接入电路；
    当电压幅度处于降低阶段时，当LED灯串和LED灯组均点亮时；随着输出电压降低，P型开关模块控制LED灯串不接入电路，随着输出电压继续降低，N型驱动模块控制LED灯组不接入电路。
  9. 根据权利要求8所述的驱动方法，其特征在于，所述LED灯串包括第一LED灯串和第二LED灯串；所述P型开关模块包括第一P型开关模块和第二P型开关模块；所述LED灯组包括第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组；所述N型驱动模块包括第一N型驱动模块、第二N型驱动模块、第三N型驱动模块和第四N型驱动模块；
    当电压幅度处于增长阶段时，当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均未点亮时，随着输出电压升高，第一N型驱动模块控制第一LED灯组点亮，随着输出电压继续升高，第一P型开关模块控制第一LED灯串也点亮；电压继续升高，第二P型开关模块控制第二LED灯串点亮，此时第一LED灯串、第二LED灯串和第一LED灯组处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第二N型驱动模块控制第二LED灯组点亮，此时第一LED灯组和第二LED灯组处于点亮状态；随着电压继续升高，第一LED灯串点亮，此时第一LED灯组、第二LED灯组和第一LED灯串处于点亮状态；随着电压继续升高，第二LED灯串点亮，此时第一LED灯组、第二LED灯组、第一LED灯串和第二LED灯串处于点亮状态；随着电压继续升高，第一LED灯串和第二LED灯串熄灭，第三LED灯组点亮；以此类推至LED灯串和LED灯组全部点亮；
    当电压幅度处于降低阶段时，当第一LED灯串、第二LED灯串、第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态时；随着输出电压降低，第二P型开关模块控制第二LED灯串熄灭，随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组、第三LED灯组和第四LED灯组均处于点亮状态；随着电压继续降低，第四N型驱动模块控制第四LED灯组熄灭，第一LED灯串和第二LED灯串处于点亮状态；随着电压继续降低，第二P型开关模块控制第二LED灯串熄灭；随着输出电压继续降低，第一P型开关模块控制第一LED灯串熄灭，此时第一LED灯组、第二LED灯组和第三LED灯组处于点亮状态；以此类推至LED灯串和LED灯组全部熄灭。
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