WO2015014192A1 - 动态配置分段led驱动装置和led照明装置 - Google Patents

动态配置分段led驱动装置和led照明装置 Download PDF

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Publication number
WO2015014192A1
WO2015014192A1 PCT/CN2014/081411 CN2014081411W WO2015014192A1 WO 2015014192 A1 WO2015014192 A1 WO 2015014192A1 CN 2014081411 W CN2014081411 W CN 2014081411W WO 2015014192 A1 WO2015014192 A1 WO 2015014192A1
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WIPO (PCT)
Prior art keywords
unit
type switch
module
led
string
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PCT/CN2014/081411
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English (en)
French (fr)
Inventor
陈小雨
陈博
邓迅升
麦炎全
Original Assignee
深圳市晟碟半导体有限公司
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Filing date
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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 US14/895,999 priority Critical patent/US9591708B2/en
Priority to EP14832539.2A priority patent/EP3030052B1/en
Publication of WO2015014192A1 publication Critical patent/WO2015014192A1/zh

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Classifications

    • 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
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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
    • 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 LED lighting technology, and more particularly to a dynamically configured segmented LED driving device and LED lighting device.
  • FIG. 1 is the publication number CN.
  • Circuit diagram of the invention patent of 102196627 in which MOS tubes 88, 87, 86 are used for short or open LED short strings 62, LED short strings 61, and LED short strings 60.
  • MOS transistor 87 when MOS transistor 87 shorts LED short string 61, the voltage between L3 and L4 is close to zero; when MOS transistor 87 is open LED short string 61, the voltage between L3 and L4 is 16N ⁇ 3.0V (3.0V is the voltage across the single LED when it is in the bright state).
  • the minimum withstand voltage of the Drain and Source terminals of the standard MOS transistor 87 is 96V.
  • the gate of the MOS transistor 87 (connected to the NG4) drive circuit is also very complicated. In existing semiconductor processes, such MOS cannot be integrated. Therefore, the circuit structure of the above driving circuit is particularly complicated, and the device has high withstand voltage requirements, is difficult to integrate in one chip, and does not meet the increasingly miniaturization requirements of electronic products.
  • patent 2 is passed through AC (alternating) Current, synchronous circuit, strobes different LED strings at different times and adjusts the current in the LED string according to time.
  • AC alternating
  • 12B is turned off and 12C is turned on at a certain time point, and the number of LEDs increases when 12C is turned on, and the current in the LED increases.
  • the Drain terminal voltage of 122 in 12B will be very high, about the total number of lights of string 11A and string 11B multiplied by 3.0V, usually the current in the LED is 30mA or higher. .
  • the efficiency will be less than 80%.
  • the power consumption on the chip is 2.7W, which will put higher requirements on the package of the chip.
  • the luminous flux of the conventional AC LED drive increases as the power supply voltage increases, the luminous flux changes relatively, and the conventional AC LED drive, part of the light string that illuminates at low voltage lights up, all lights are lit at high voltage, so that in a sinusoidal voltage cycle, some of the LEDs are almost all off, and the other part of the LED is only 1/4 or less. The time is on, so that the attenuation of all LED wicks is inconsistent, resulting in poor illumination after a long time.
  • an object of the present invention is to provide a dynamically configured segmented LED driving device and an LED lighting device to solve the problem of low conversion efficiency and poor illumination effect caused by inconsistent conversion efficiency of the LED wick.
  • a dynamically configured segmented LED driving device coupled to a rectifier bridge, comprising: a first adjustable LED string unit, a first N-type switch module, at least one adjustable LED string module, and at least one P-type switch module At least one second N-type switch module, for controlling the first adjustable LED light string unit, the adjustable LED light string module, the P-type switch module, the first N-type switch module and the second N-type switch module a working control logic module and a current detecting module for detecting an output current of the first N-type switching module and the second N-type switching module and feeding back to the control logic module; the adjustable LED string module comprising a second adjustable LED a string unit and a one-way unit;
  • the control logic module controls the first adjustable LED light string unit, the adjustable LED light string module, the P-type switch module, the first N-type switch module and the second N-type according to a change output control signal of the rectifier bridge output voltage
  • the opening and closing state of the switch module dynamically adjusts the series-parallel state of the first adjustable LED string unit and the second adjustable LED string unit.
  • the P terminal of the second adjustable LED light string unit is connected to the positive output end of the rectifier bridge, and the negative electrode of the one-way conduction unit is connected through the P-type switch module and the first Adjusting the P end of the LED string unit, the N end of the second adjustable LED string unit is connected to the anode of the unidirectional conduction unit, and the N end of the second adjustable LED string unit passes the second N-type switch module A current detecting module is connected, and the N terminal of the first adjustable LED string unit is connected to the current detecting module through the first N-type switch module.
  • the second adjustable LED string unit comprises a first LED string, a second LED string and a first P-switch unit; the first LED string and The second LED light string is connected in series, one end of the first P-type switch unit is connected to the positive pole of the first LED light string, and the other end of the first P-type switch unit is connected to the negative pole of the first LED light string and the second LED light string.
  • the positive pole, the control end of the first P-type switch unit is connected to the control logic module, the positive pole of the first LED light string is connected to the positive output end of the rectifier bridge, and the negative pole of the second LED light string is connected to the positive pole of the single-conducting unit.
  • the second adjustable LED string unit comprises a first LED string, a second LED string, a third LED string, a first P-type switch unit and a second a P-type switch unit; the first LED light string and the second LED light string and the third LED light string are connected in series, one end of the first P-type switch unit is connected to the positive pole of the first LED light string, and the first P-type switch The other end of the unit is connected to the anode of the first LED string and the anode of the second LED string, the control end of the first P-type switch unit is connected to the control logic module; and one end of the second P-type switch unit is connected to the second LED lamp The positive pole of the string, the other end of the second P-type switch unit is connected to the anode of the second LED string and the anode of the third LED string, and the control end of the second P-switch unit is connected to the control logic module, the first LED lamp The positive pole of the string is connected to the positive output of the rectifier bridge
  • the one-way conduction unit includes a diode, and the anode of the diode is connected to the N terminal of the second adjustable LED string unit, and the cathode of the diode is connected to the first adjustable LED. P end of the string unit.
  • the first N-type switch module includes a second MOS transistor, the gate of the second MOS transistor is connected to the control logic module, and the drain of the second MOS transistor is connected to the first
  • the N-terminal of the LED string unit can be adjusted, and the source of the second MOS tube is grounded through the current detecting module;
  • the second N-type switch module includes a third MOS transistor, the gate of the third MOS transistor is connected to the control logic module, and the drain of the third MOS transistor is connected to the N terminal of the second adjustable LED string unit, and the third The source of the MOS transistor is grounded through the current sensing module.
  • the P-type switch module includes a controllable current source, a JFET, a first resistor, a Zener diode, and a first MOS transistor; and the controllable current source is connected to the control logic module.
  • One end of the controllable current source is connected to the source of the JFET, and the other end of the controllable current source is grounded; the drain of the JFET is connected to the gate of the first MOS transistor, and the source of the first MOS transistor is also connected through the first resistor a gate of the JFET is connected to the ground; a cathode of the Zener diode is connected to a gate of the first MOS transistor, and a cathode of the Zener diode is connected to a source of the first MOS transistor; and a drain connection of the first MOS transistor is adjustable The LED string module and the first adjustable LED string unit, the source of the first MOS tube being connected to the positive output of the rectifier bridge.
  • the adjustable LED string module, the P-type switch module and the second N-type switch module are K, wherein K is a positive integer;
  • the control logic module controls the first adjustable LED light string unit, the K adjustable LED light string modules, the K P-type switch modules, the first N-type switch module, and the output control signal according to the change of the rectifier bridge output voltage.
  • the opening and closing state of the K second N-type switch modules dynamically adjusts the series-parallel mode of the first adjustable LED light string unit and the K second adjustable LED light string units to realize a set of N adjustable LED light string units In series, then each group is connected in parallel; wherein N is a positive integer from 1 to K+1.
  • An LED lighting device comprising: a rectifier bridge for rectifying an input signal and the above-mentioned dynamically arranged segmented LED driving device, wherein a positive output end of the rectifier bridge is connected to a dynamically configured segmented LED driving device, and a rectifier bridge The negative output is grounded.
  • the present invention provides a dynamically configured segmented LED driving device and an LED lighting device.
  • the control logic module outputs a control signal to control the first adjustable LED light string according to a change of a rectifier bridge output voltage.
  • the unit, the adjustable LED light string module, the P-type switch module, the first N-type switch module and the second N-type switch module are opened and closed, and the first adjustable LED light string unit and the adjustable LED light string module are dynamically adjusted.
  • Series and parallel state The invention adopts a dynamic configuration technology to make as many LEDs as possible emit light, and the time for lighting all the LED wicks is consistent, thereby improving the lighting effect and the utilization of the wick.
  • Figure 1 is a circuit diagram of the patent publication CN 102196627.
  • Figure 2 is a circuit diagram of the patent of the publication US 2011/0084619 A1.
  • FIG. 3 is a structural block diagram of a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a P-type switch module in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 5 is a circuit diagram of an embodiment of an adjustable LED string module in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 6 is a circuit diagram of another embodiment of an adjustable LED string module in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 7 is a circuit diagram of a unidirectional conduction unit in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 8 is a circuit diagram of a first N-type switch module in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 9 is a circuit diagram of a second N-type switch module in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a dynamically configured segmented LED driving device according to a second preferred embodiment of the present invention.
  • the present invention provides a dynamic configuration of a segmented LED driving device and an LED lighting device.
  • 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.
  • the dynamic configuration segment LED driving device is connected to the positive output end of the rectifier bridge for dynamically configuring the number of lighting of the segment LED, comprising: a first adjustable LED light string unit and a first N-type switch module At least one adjustable LED string module, at least one P-type switch module, at least one second N-type switch module, for controlling the first adjustable LED string unit, the adjustable LED string module, and the P-type switch a control logic module for operating the module, the first N-type switch module and the second N-type switch module, and current detection for detecting output currents of the first N-type switch module and the second N-type switch module and fed back to the control logic module Module.
  • the adjustable LED string module comprises a second adjustable LED string unit and a unidirectional unit.
  • the control logic module controls the first adjustable LED light string unit, the adjustable LED light string module, the P-type switch module, the first N-type switch module and the second N according to a change of the rectifier bridge output voltage
  • the opening and closing state of the type switch module dynamically adjusts the series-parallel state of the first adjustable LED string unit and the second adjustable LED string unit.
  • FIG. 3 is a structural block diagram of a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • the first adjustable LED string unit 210, the first N-type switch module 310, and the adjustable LED string module 200 are all one.
  • the P-type switch module 400, the second N-type switch module 320, the control logic module 500, and the current detecting module 600 are all one.
  • the control logic module 500 outputs a PEN signal to control the P-type switch module 400 to be turned on or off, and the output NEN ⁇ 1-2> signal controls the first N-type switch module 310 and the second N-type switch module 320 to be turned on or off, thereby The series-parallel state of the second adjustable LED string unit 220 and the first adjustable LED string unit 210 is controlled.
  • the control logic module 500 outputs LED_CTL1, LED_CTL2 signals to configure the number of lighting of the adjustable LED string module 200 and the LEDs in the first adjustable LED string unit 210, the first end 1 of the current detecting module 600 is connected The second end 2 of the first N-type switch module 310 and the second N-type switch module 320, the current detecting module 600 is connected to the control logic module 500, and the third end 3 of the current detecting module 600 is grounded for detecting the flow through the first Adjusting the LED string unit 210 and/or adjusting the current of the LEDs in the LED string module 200, and outputting the detection result to the control logic module 500, and the control logic module 500 reverses the voltage output by the rectifier bridge 100 according to the detection result thereof. .
  • the control logic module 500 can control the output of the corresponding control signal by using the control chip and the corresponding control software, and dynamically configure the second adjustable LED string unit 220 and the first adjustable LED lamp in the adjustable LED string module 200.
  • the current detecting module 600 can detect the current flowing through the first N-type switch module 310 and the second N-type switch module 320 and feed back to the control logic module 500.
  • the circuit structure of the current detecting module 600 is not used in the present invention. limit.
  • the P-type switch module 400 includes a controllable current source I, a JFET (the earliest field effect transistor having a practical structure, also referred to as a PN junction field effect transistor) J1, and a first resistor R1. Zener diode DZ1 and first MOS transistor Q1.
  • the JFET J1 is a high voltage N-type JFET
  • the first MOS transistor Q1 is a high voltage PMOS transistor, wherein the high voltage N-type JFET
  • the high voltage resistance of J1 and high voltage PMOS transistors is above 311V (that is, the peak voltage of the rectifier bridge 100 output).
  • the controllable current source I is connected to the control logic module 500.
  • One end of the controllable current source I is connected to the source of the JFET J1, and the other end of the controllable current source I is grounded.
  • the drain of the JFET J1 is connected to the first MOS.
  • the gate of the transistor Q1 is also connected to the source of the first MOS transistor Q1 through the first resistor R1, and the gate of the JFET J1 is grounded.
  • the control logic module 500 outputs a PEN signal to control the state of the controllable current source I.
  • the controllable current source I provides an on-state current I th and an off-state current 0.1 ⁇ I th .
  • the high-voltage N-type JFET J1 is in a normally-on state, and is mainly used to provide a cascade function to ensure that the voltage of its source is below its pinch-off voltage, preventing the controllable current source I from being damaged by overvoltage.
  • the anode of the Zener diode DZ1 is connected to the gate of the first MOS transistor Q1, the cathode of the Zener diode DZ1 is connected to the source of the first MOS transistor Q1; and the drain of the first MOS transistor Q1 is connected to the adjustable LED string
  • the module 200 and the first adjustable LED string unit 210 (labeled as -/P in FIG. 4), the source of the first MOS transistor Q1 is connected to the positive output of the rectifier bridge 100 (marked in FIG. 4 Is +).
  • the P-type switch module 400 of the embodiment when a current flows through the first resistor R1, a voltage difference is generated across the first resistor R1, and when the current value output by the controllable current source I is Ith , The voltage difference is sufficient to turn on the high voltage PMOS transistor; when the current value is 0.1 ⁇ I th , the voltage difference is insufficient to turn on the PMOS transistor, so that the PMOS transistor is in an off state.
  • the Zener diode DZ1 provides a clamping function to prevent damage to the gate and source voltages of the PMOS transistor.
  • the P-type switch module 400 of the embodiment implements a low voltage control signal to control the on and off of the high voltage PMOS transistor.
  • the JFET J1 can also be replaced by other electronic components, such as high-voltage NMOS transistors, NPN transistors, and so on.
  • the off-state current of the controllable current source I can be increased, or can be further reduced to reduce static power consumption.
  • the adjustable LED string module 200 includes a second adjustable LED string unit 220 and a unidirectional conduction unit 230, and the second The P terminal of the adjustment LED string unit 220 is connected to the positive output of the rectifier bridge 100, the negative terminal of the unidirectional conduction unit 230 and the P terminal of the first adjustable LED string unit 210 are also connected through the P-type switch module 400.
  • the N-terminal (ie, negative) of the second adjustable LED string unit 220 is connected to the anode of the unidirectional conduction unit 230, and the N-terminal of the second adjustable LED string unit 220 passes through the second N-type switch module 320.
  • the current detecting module 600 is connected, and the N terminal of the first adjustable LED string unit 210 is connected to the current detecting module 600 through the first N-type switching module 310.
  • the second adjustable LED light string unit 220 has the same circuit structure as the first adjustable LED light string unit 210, and can adopt various circuit structures.
  • a circuit structure of the second adjustable LED string unit 220 includes a first LED string M1, a second LED string M2, and a first P-type switching unit 410.
  • the circuit structure of the first LED light string M1 and the second LED light string M2 is the same, each LED light string is composed of a plurality of LED lights connected in series, and the first LED light string M1 and the second LED light string M2 is connected in series.
  • One end of the first P-type switch unit 410 is connected to the positive pole of the first LED light string M1, and the other end of the first P-type switch unit 410 is connected to the negative pole of the first LED light string M1 and the positive pole of the second LED light string M2.
  • the control end of the first P-type switch unit 410 is connected to the control logic module 500.
  • the positive pole of the first LED light string M1 is connected to the positive output end of the rectifier bridge 100, and the negative pole of the second LED light string M2 is connected to the single-directional conduction unit 230. positive electrode.
  • the first P-type switch unit 410 When the first P-type switch unit 410 is turned on, the first LED light string M1 is in an extinguished state, and when the first P-type switch unit 410 is turned off, the first LED light string M1 is turned on, thereby being controllable by the first The state of the P-type switch unit 410 controls the number of lighting of the LED string.
  • the first P-type switching unit 410 has the same circuit structure as the P-type switching module 400, and the only difference is that the first P-type switching unit 410 uses an isolated low-voltage PMOS tube instead of the P-type.
  • the characteristics of the isolated low voltage PMOS transistor include: (1) the voltage difference between the drain and the source of the low voltage PMOS transistor is greater than or equal to the sum of the forward voltages of the first LED string M1 connected in parallel with the first P-type switching unit 410; (2) The drain, source, and gate-to-chip substrates have a withstand voltage greater than the highest supply voltage.
  • FIG. 3 and FIG. 6 are circuit diagrams of another embodiment of an adjustable LED string unit in a dynamically configured segmented LED driving device according to a first preferred embodiment of the present invention.
  • the adjustment LED string unit is the first adjustable LED string unit 210 or the second adjustable LED string unit 220.
  • the second adjustable LED string unit 220 includes a first LED string M1, a second LED string M2, a third LED string M3, a first P-type switch unit 410, and a second P. Type switch unit 420.
  • the first LED light string M1 and the second LED light string M2 are connected in series with the third LED light string M3.
  • One end of the first P-type switching unit 410 is connected to the positive pole of the first LED light string M1, and the first P-type switch The other end of the unit 410 is connected to the anode of the first LED string M1 and the anode of the second LED string M2, and the control end of the first P-type switch unit 410 is connected to the control logic module 500; the second P-type switch unit 420 One end is connected to the positive pole of the second LED light string M2, and the other end of the second P-type switch unit 420 is connected to the negative pole of the second LED light string M2 and the positive pole of the third LED light string M3, and the control end of the second P-type switching unit 420 The control logic module 500 is connected.
  • the anode of the first LED string M1 is connected to the positive output of the rectifier bridge, and the cathode of the third LED string M3 is connected to the anode of the unidirectional conduction unit 230.
  • This alternative embodiment differs from an embodiment of the above-described adjustable LED string unit only in that a set of P-type switching units and a set of LED strings are added in another embodiment so that both The P-switch unit is turned on and off to adjust the amount of LED string illumination.
  • the P-type switching unit and the LED string can also be used in other quantities.
  • the unidirectional conduction unit 230 includes a diode D1, which is a high voltage diode (which has a high voltage resistance of 311 V or more), The positive terminal is connected to the N terminal of the second adjustable LED string unit 220, and the negative terminal of the diode D1 is connected to the P terminal of the first adjustable LED string unit 210.
  • a diode D1 which is a high voltage diode (which has a high voltage resistance of 311 V or more)
  • the positive terminal is connected to the N terminal of the second adjustable LED string unit 220, and the negative terminal of the diode D1 is connected to the P terminal of the first adjustable LED string unit 210.
  • the unidirectional conduction unit 230 only works in two states: on and off. In the on state, the voltage difference between the two ends is required to be as small as possible; in the off state, the voltage at the negative terminal is greater than Its positive terminal voltage, and requires no leakage.
  • the present invention can also use other unidirectional conduction devices having such functions, such as diode-connected MOS transistors, transistors, etc., instead of the diode.
  • the present invention does not limit the electronic components used in the unidirectional conduction device.
  • the first N-type switch module 310 includes a second MOS transistor Q2.
  • the gate of the second MOS transistor Q2 is connected to the control logic module 500, and the drain of the second MOS transistor Q2 is connected.
  • the N-terminal of the first adjustable LED string unit 210, the source of the second MOS transistor Q2 is grounded by the current detecting module 600.
  • the second N-type switch module 320 includes a third MOS transistor Q3, the gate of the third MOS transistor Q3 is connected to the control logic module 500, and the third MOS transistor Q3 is The drain is connected to the N terminal of the second adjustable LED string unit 220, and the source of the third MOS transistor Q3 is grounded through the current detecting module 600.
  • the circuit configurations of the first N-type switch module 310 and the second N-type switch module 320 are the same.
  • the second MOS transistor Q2 and the third MOS transistor Q3 are both high voltage NMOS transistors, and the withstand voltage of the second MOS transistor Q2 is higher than the withstand voltage of the third MOS transistor Q3.
  • the dynamic configuration segment LED driving device provided by the second preferred embodiment of the present invention is shown in FIG. 10.
  • the adjustable LED light string module 200, the P-type switch module 400, and the The two N-type switch modules 320 are K, wherein K is a positive integer.
  • K is a positive integer equal to 1
  • the K is a positive integer greater than or equal to 2.
  • each adjustable LED string module 200 is connected to a P-type switch module 400 and a second N-type switch module 320.
  • the first adjustable LED string unit 210 passes through a first N-type switch.
  • Module 310 is coupled to current detection module 600.
  • FIG. 10 the adjustable LED light string module 200, the P-type switch module 400, and the The two N-type switch modules 320 are K, wherein K is a positive integer.
  • K is a positive integer equal to 1
  • the K is a positive integer greater than or equal to 2.
  • each adjustable LED string module 200 is connected to a P-type switch module 400 and a second N-type switch module 320
  • the P-type switch module 400 and the second N-type switch module 320 are first, second, ..., K, from left to right (the serial numbers 1, 2 shown in the bold font of FIG. 10). ... K), the second adjustable LED string unit 220 is first, second, ..., K, from top to bottom (the numbers 1, 2, ... K shown in the bold font of Fig. 10).
  • the second N-type switch module 320 is the same as the first N-type switch module 310, and the present invention will be the first for convenience of description.
  • the adjustment LED string unit 210 and the second adjustable LED string unit 220 are referred to as adjustable LED string units
  • the second N-type switch module 320 and the first N-type switch module 310 are referred to as N-type switch modules. Therefore, the number of the adjustable LED string unit and the N-type switch module of the second preferred embodiment is K+1
  • the N-type switch module is composed of a high-voltage NMOS tube, and the withstand voltage is from the first to the Kth. +1 is lowered in turn.
  • the control logic module controls the first adjustable LED light string unit, the K adjustable LED light string modules, the K P-type switch modules, the first N-type switch module, and the output control signal according to the change of the rectifier bridge output voltage.
  • the opening and closing state of the K second N-type switch modules dynamically adjusts the series-parallel mode of the first adjustable LED light string unit and the K second adjustable LED light string units to realize a set of N adjustable LED light string units In series, then each group is connected in parallel; wherein N is a positive integer from 1 to K+1.
  • the current detecting module 600 detects the current in each N-type switching module and feeds back to the control logic module 500.
  • the control logic module is provided.
  • the output signals PEN ⁇ 1:K>, LED_CTL1-LED_CTLK+1, and NEN ⁇ 1:K+1> control the serial state of each adjustable LED string and each Adjust the number of LEDs in the LED string to dynamically configure the number of LEDs to illuminate.
  • all the adjustable LED string units are connected in parallel, and all the LED strings are illuminated at this time.
  • the implementation method is as follows: all P-type switch modules 400 (which are K) and all N-type switch modules (which are K+1) are turned on, and all the unidirectional conduction units 230 (which are K) are positive.
  • the terminals are connected to the current detecting module 600 through the corresponding N-type switching module to the ground, and the negative ends of all the single-conducting units 230 are connected to the output of the rectifier bridge 100 through the corresponding P-type switching module 400, and all the single-conducting units 230 In the reverse cut-off state, the adjustable LED string units are each isolated by a reverse-cut unidirectional conduction unit 230.
  • the second adjustable LED string unit to the K+1 adjustable LED string unit P terminal is connected to the positive output of the rectifier bridge 100 through the corresponding P-type switch module 400; all adjustable LED string units
  • the N terminal is connected to the first end 1 of the current detecting module 600 through the N-type switch module, so that all the adjustable LED string units have current flowing, and all the adjustable LED string units have light output.
  • the implementation method is: the control logic module 500 controls the first P-type switch module 400 to be turned off, the second P-type switch module 400 to be turned on, the first N-type switch module is turned off, and the second N-type switch module is turned on, then
  • the first adjustable LED string unit, the first one-way unit 230, and the second adjustable LED string unit are connected between the output of the rectifier bridge 100 and the current detecting module 600, so that the first and second Adjusting the LED string unit is in the lighting state; similarly turning off the third P-type switch module 400, the fourth P-type switch module 400 is turned on, the third N-type switch module is turned off, and the fourth N-type switch is turned off.
  • the module is turned on, so that the third adjustable LED string unit, the third one-way conduction device and the fourth adjustable LED light are connected in series between the output of the rectifier bridge 100 and the current detecting module 600, the third and the fourth The adjustable LED string unit is in a lit state; and so on, controlling the 2N-1 P-type switch module 400 and the 2N-1 N-type switch module to be turned off, the 2Nth P-type switch module 400, and the 2Nth N-type switch module is turned on, so that the 2N-1 adjustable LED string unit and the 2N-1 one-way unit 2 30 and the 2N adjustable LED string unit are connected between the output end of the rectifier bridge 100 and the current detecting module 600 to be in a lighting state, so that the adjustable LED string unit is connected in series and then in parallel.
  • the implementation method is: controlling the first and second P-type switch modules 400 to be turned off, the third P-type switch module 400 to be turned on, the first and second N-type switch modules are turned off, and the third N-type switch module is turned on, so that The 1-3 tunable LED string unit, the 1-2th unidirectional pass unit 230 is connected between the output end of the rectifier bridge 100 and the current detecting module 600, so that the 1-3th adjustable LED string unit In the lighting state; the fourth and fifth P-type switch modules 400 are turned off, the sixth P-type switch module 400 is turned off, and the fourth and fifth N-type switch modules are turned off, and the sixth N is controlled.
  • the type switch module is turned on, so that the 4-6th adjustable LED string unit and the 4-5th unidirectional conduction unit 230 are connected between the output end of the rectifier bridge 100 and the current detecting module 600, so that the 4-6th The adjustable LED string unit is in a lit state; and so on, the 3N-2, 3N-1 P-type switch module 400 is turned off, and the 3N-2, 3N-1 N-type switch modules are turned off.
  • the present invention can implement the P string Q and where P takes an integer value between 1 and K+1, and the value of Q ranges from 1 to (K+1)/P.
  • the embodiment of the invention further provides an LED lighting device, which comprises: a rectifier bridge for rectifying an input signal and a dynamic configuration segment LED driving device, wherein a positive output end of the rectifier bridge is connected with a dynamic configuration segment LED driver The device, the negative output of the rectifier bridge is grounded.
  • the AC mains AC is connected from the rectifier bridge, and is rectified by the rectifier bridge to input a dynamically configured segmented LED driving device.
  • the dynamically configured segmented LED driving device dynamically configures the strings of the adjustable LED string units according to the output voltage of the rectifier bridge. And state. Since the circuit structure and working principle of the dynamically configured segmented LED driving device are described in detail above, details are not described herein again.
  • the present invention has the following beneficial effects:
  • the traditional AC The luminous flux of the LED drive increases as the supply voltage increases.
  • all the light strings are connected in parallel at a low voltage, and then the light strings are grouped in series and then connected in parallel according to the voltage change, thereby illuminating as many light beads as possible, thereby ensuring Can output more light energy. This ensures that most of the LED wicks are illuminated during the entire power supply change, and the luminous flux does not change much.
  • the traditional AC LED drive part of the light string that illuminates at low voltage lights up, all lights are lit at high voltage, so that in a sinusoidal voltage cycle, some of the LEDs are almost all lit, and another part of the LED (generally only 1/4) Or less time) is lit, so that the attenuation of all LED wicks is inconsistent, resulting in poor illumination after a long time.
  • the dynamically configured segmented LED driver to be invented almost all of the LED wicks are illuminated for the same amount of time, resulting in a consistent long-term illumination effect.
  • the wick can emit light almost all the time, which improves the utilization rate of the wick.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

动态配置分段LED驱动装置，包括第一可调节LED灯串单元（210）、第一N型开关模块（310）、第二可调节LED灯串单元（220）、单向导通单元（230）、至少一P型开关模块（400）、至少一第二N型开关模块（320）、控制逻辑模块（500）和电流检测模块（600）；控制逻辑模块（500）根据整流桥输出电压的变化控制第一可调节LED灯串单元（210）、第二可调节LED灯串单元（220）、单向导通单元（230）、P型开关模块（400）、第一N型开关模块（310）和第二N型开关模块（320）的启闭状态，动态调节第一可调节LED灯串单元（210）和第二可调节LED灯串单元（220）的串并联状态。

Description

动态配置分段LED驱动装置和LED照明装置
技术领域
本发明涉及LED照明技术，特别涉及一种动态配置分段LED驱动装置和LED照明装置。
背景技术
传统的LED（Light Emitting Diode，发光二极管）驱动电路中，市电经过整流桥变成直流电后，一般还需要经过电感及电解电容器件进行处理来驱动LED，但电解电容的寿命较短，严重制约了LED驱动电路的整体寿命，而且转换效率一般在80%左右，其转换效率低，这样严重影响了LED的照明效果。
为了避免在驱动电路中使用电感和电容，设计人员对LED驱动电路进行了一些改进，如图1所示，其为公开号为CN 102196627的发明专利的电路图，在该专利中，MOS管88、87、86，用于短路或开路LED短串62、LED短串61、LED短串60。以MOS管87为例，当MOS管87短路LED短串61时，L3和L4之间的电压接近为零；当MOS管87开路LED短串61时，L3和L4之间的电压为16N×3.0V（3.0V为单个LED处于亮态时的两端的电压）。假设市电输入电压为220V，当所有LED点亮时LED上的压降应当接近于整流桥输出的最高电压220×1.414＝311V，可见LED的总数量应当为100左右，所以N至少为2。所以当MOS管87开路LED短串61时，L3和L4之间的电压为16N×3.0V>16×2×3.0V=96V。若所有的LED均处于亮态时，L3对地的电压15×3.0V＝45.0V。
从上面的分析可以得知，MOS管87的Source(接在L3上)对地最低耐受电压45V，MOS管87的Drain(接在L4上)对地最低耐受电压45+96=141V，而标准MOS管87的Drain和Source端的最低耐受电压为96V。同时MOS管87的gate（接在NG4上）驱动电路也非常复杂。在现有的半导体工艺中，这种MOS不可能集成。因此上述驱动电路的电路结构特别复杂，对器件的耐压要求较高，难于在一个芯片内集成，不满足电子产品日益微型化要求。
如图2所示，其为公开号为US 2011/0084619A1的发明专利的电路图，根据其权利要求2的描述可得知，专利2通过AC（alternating current，交流电）同步电路，在不同的时刻选通不同的LED灯串，并根据时间调节LED灯串中的电流。在驱动LED时，在一定的时间点使12B关断、12C打开，12C打开时LED的数量增加，同时LED中的电流增大。然而，在12B关断的瞬间，12B中的122的Drain端电压将会非常高，约为灯串11A及灯串11B灯的总数量乘以3.0V，通常LED中的电流为30mA或者更高。假设11a和11b中的灯数量为30个，那么芯片上的功耗为30×3.0V×30mA=2700mW，对于常用的7W LED照明系统而言，其效率将会小于80%。同时芯片上的功耗为2.7W，也会给芯片的封装提出更高的要求。
而且传统的AC LED驱动的光通量随着电源电压的升高而升高，光通量的变化比较大，而且传统的AC LED驱动，在低压时点亮的部分灯串点亮，高压时全部灯串点亮，这样在一个正弦电压周期里，部分LED几乎全部都处于熄灭状态，另外一部分LED只有1/4或更少的时间处于点亮状态，这样所有LED灯芯的衰减是不一致的，从而导致时间较长后，照明效果变差。
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动态配置分段LED驱动装置和LED照明装置，以解决现有技术转换效率低及LED灯芯衰减不一致导致照明效果差的问题。
为了达到上述目的，本发明采取了以下技术方案：
一种动态配置分段LED驱动装置，其与整流桥连接，其包括：第一可调节LED灯串单元、第一N型开关模块、至少一可调节LED灯串模块、至少一P型开关模块、至少一第二N型开关模块、用于控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的工作的控制逻辑模块和用于检测第一N型开关模块和第二N型开关模块的输出电流并反馈给控制逻辑模块的电流检测模块；所述可调节LED灯串模块包括第二可调节LED灯串单元和单向导通单元；
所述控制逻辑模块根据整流桥输出电压的变化输出控制信号控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和第二可调节LED灯串单元的串并联状态。
所述的动态配置分段LED驱动装置中，所述第二可调节LED灯串单元的P端连接整流桥的正输出端、还通过P型开关模块连接单向导通单元的负极和第一可调节LED灯串单元的P端，所述第二可调节LED灯串单元的N端连接单向导通单元的正极，所述第二可调节LED灯串单元的N端通过第二N型开关模块连接电流检测模块，所述第一可调节LED灯串单元的N端通过第一N型开关模块连接电流检测模块。
所述的动态配置分段LED驱动装置中，所述第二可调节LED灯串单元包括第一LED灯串、第二LED灯串和第一P型开关单元；所述第一LED灯串和第二LED灯串串联，所述第一P型开关单元的一端连接第一LED灯串的正极，第一P型开关单元的另一端连接第一LED灯串的负极和第二LED灯串的正极，第一P型开关单元的控制端连接控制逻辑模块，所述第一LED灯串的正极连接整流桥的正输出端，第二LED灯串的负极连接单向导通单元的正极。
所述的动态配置分段LED驱动装置中，所述第二可调节LED灯串单元包括第一LED灯串、第二LED灯串、第三LED灯串、第一P型开关单元和第二P型开关单元；所述第一LED灯串和第二LED灯串和第三LED灯串串联，所述第一P型开关单元的一端连接第一LED灯串的正极，第一P型开关单元的另一端连接第一LED灯串的负极和第二LED灯串的正极，第一P型开关单元的控制端连接控制逻辑模块；所述第二P型开关单元的一端连接第二LED灯串的正极，第二P型开关单元的另一端连接第二LED灯串的负极和第三LED灯串的正极，第二P型开关单元的控制端连接控制逻辑模块，所述第一LED灯串的正极连接整流桥的正输出端，第三LED灯串的负极连接单向导通单元的正极。
所述的动态配置分段LED驱动装置中，所述单向导通单元包括二极管，所述二极管的正极连接第二可调节LED灯串单元的N端，所述二极管的负极连接第一可调节LED灯串单元的P端。
所述的动态配置分段LED驱动装置中，所述第一N型开关模块包括第二MOS管，所述第二MOS管的栅极连接控制逻辑模块，第二MOS管的漏极连接第一可调节LED灯串单元的N端，第二MOS管的源极通过电流检测模块接地；
所述第二N型开关模块包括第三MOS管，所述第三MOS管的栅极连接控制逻辑模块，第三MOS管的漏极连接第二可调节LED灯串单元的N端，第三MOS管的源极通过电流检测模块接地。
所述的动态配置分段LED驱动装置中，所述P型开关模块包括可控电流源、JFET、第一电阻、齐纳二极管和第一MOS管；所述可控电流源连接控制逻辑模块，可控电流源的一端连接所述JFET的源极，可控电流源的另一端接地；所述JFET的漏极连接第一MOS管的栅极、还通过第一电阻连接第一MOS管的源极，JFET的栅极接地；所述齐纳二极管的正极连接第一MOS管的栅极，齐纳二极管的负极连接第一MOS管的源极；所述第一MOS管的漏极连接可调节LED灯串模块和第一可调节LED灯串单元，所述第一MOS管的源极连接所述整流桥的正输出端。
所述的动态配置分段LED驱动装置中，所述可调节LED灯串模块、P型开关模块和第二N型开关模块为K个，其中，K为正整数；
所述控制逻辑模块根据整流桥输出电压的变化输出控制信号控制所述第一可调节LED灯串单元、K个可调节LED灯串模块、K个P型开关模块、第一N型开关模块和K个第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和K个第二可调节LED灯串单元的串并联方式，实现N个可调LED灯串单元一组串联，然后各组并联；其中，N为1到K＋1的正整数。
一种LED照明装置，其包括：用于对输入信号进行整流的整流桥和上述的动态配置分段LED驱动装置，所述整流桥的正输出端连接动态配置分段LED驱动装置，整流桥的负输出端接地。
相较于现有技术，本发明提供的一种动态配置分段LED驱动装置和LED照明装置，通过控制逻辑模块根据整流桥输出电压的变化，输出控制信号控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和可调节LED灯串模块的串并联状态。本发明采用了动态配置技术，使尽量多的LED发光，并且使所有LED灯芯点亮的时间一致，提高了照明效果和灯芯的利用率。
附图说明
图1为公开号为CN 102196627的专利的电路图。
图2为公开号为US 2011/0084619A1的专利的电路图。
图3本发明第一较佳实施例提供的动态配置分段LED驱动装置的结构框图。
图4为本发明第一较佳实施例提供的动态配置分段LED驱动装置中P型开关模块的电路图。
图5为本发明第一较佳实施例提供的动态配置分段LED驱动装置中可调节LED灯串模块的一实施例的电路图。
图6为本发明第一较佳实施例提供的动态配置分段LED驱动装置中可调节LED灯串模块的另一实施例的电路图。
图7为本发明第一较佳实施例提供的动态配置分段LED驱动装置中单向导通单元的电路图。
图8为本发明第一较佳实施例提供的动态配置分段LED驱动装置中第一N型开关模块的电路图。
图9为本发明第一较佳实施例提供的动态配置分段LED驱动装置中第二N型开关模块的电路图。
图10为本发明第二较佳实施例提供的动态配置分段LED驱动装置的结构框图。
具体实施方式
本发明提供一种动态配置分段LED驱动装置和LED照明装置，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。
本发明提供的动态配置分段LED驱动装置连接在整流桥的正输出端，用于动态配置分段LED的点亮数量，其包括：第一可调节LED灯串单元、第一N型开关模块、至少一可调节LED灯串模块、至少一P型开关模块、至少一第二N型开关模块、用于控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的工作的控制逻辑模块和用于检测第一N型开关模块和第二N型开关模块的输出电流并反馈给控制逻辑模块的电流检测模块。其中，所述可调节LED灯串模块包括第二可调节LED灯串单元和单向导通单元。
所述控制逻辑模块根据整流桥输出电压的变化，输出控制信号控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和第二可调节LED灯串单元的串并联状态。
请参阅图3，其为本发明第一较佳实施例提供的动态配置分段LED驱动装置的结构框图。如图3所示，本实施例的动态配置分段LED驱动装置中，所述第一可调节LED灯串单元210、第一N型开关模块310、可调节LED灯串模块200（包括第二可调节LED灯串单元220和单向导通单元230）、P型开关模块400、第二N型开关模块320、控制逻辑模块500和电流检测模块600均为一个。
所述控制逻辑模块500输出PEN信号控制P型开关模块400开启或关断，输出NEN<1-2>信号控制第一N型开关模块310和第二N型开关模块320开启或关断，从而控制第二可调节LED灯串单元220和第一可调节LED灯串单元210的串并联状态。所述控制逻辑模块500输出LED_CTL1、LED_CTL2信号来配置可调节LED灯串模块200和第一可调节LED灯串单元210中的LED的点亮数量，所述电流检测模块600的第一端1连接第一N型开关模块310和第二N型开关模块320、电流检测模块600的第二端2连接控制逻辑模块500、电流检测模块600的第三端3接地，用于检测流过第一可调节LED灯串单元210和/或可调节LED灯串模块200中的LED的电流，并将检测结果输出到控制逻辑模块500，由控制逻辑模块500根据其检测结果反推整流桥100输出的电压。所述控制逻辑模块500可采用控制芯片和相应的控制软件控制其输出相应的控制信号，动态配置可调节LED灯串模块200中的第二可调节LED灯串单元220和第一可调节LED灯串单元210的串并联状态。所述电流检测模块600只要能检测流过第一N型开关模块310和第二N型开关模块320的电流，并反馈给控制逻辑模块500即可，本发明对电流检测模块600的电路结构不作限制。
请一并参阅图4，所述P型开关模块400包括可控电流源I、JFET（最早具有实际结构的场效应晶体管，也被称为PN结型场效应晶体管）J1、第一电阻R1、齐纳二极管DZ1和第一MOS管Q1。其中，所述JFET J1为高压N型JFET，第一MOS管Q1为高压PMOS管，其中，高压N型JFET J1和高压PMOS管耐高压均在311V（即整流桥100输出的峰值电压）以上。
所述可控电流源I连接控制逻辑模块500，可控电流源I的一端连接所述JFET J1的源极，可控电流源I的另一端接地；所述JFET J1的漏极连接第一MOS管Q1的栅极、还通过第一电阻R1连接第一MOS管Q1的源极，JFET J1的栅极接地。所述 控制逻辑模块 500 输出PEN信号控制可控电流源I的状态，可控电流源I提供开态电流Ith和关态电流0.1×Ith。所述高压N型JFET J1处于常开状态，主要用于提供级联作用，保证其源极的电压在其夹断电压以下，防止可控电流源I因过压而损坏。
所述齐纳二极管DZ1的正极连接第一MOS管Q1的栅极，齐纳二极管DZ1的负极连接第一MOS管Q1的源极；所述第一MOS管Q1的漏极连接可调节LED灯串模块200和第一可调节LED灯串单元210（在图４中标记为-/P），所述第一MOS管Q1的源极连接所述整流桥100的正输出端（在图４中标记为+）。
在本实施例的P型开关模块400中，当电流流过第一电阻R1时，会在第一电阻R1的两端产生电压差，当可控电流源I输出的电流值为Ith时，此电压差足以使高压PMOS管导通；当电流值为0.1×Ith时，此电压差不足以使PMOS管导通，从而PMOS管处于截止状态。所述齐纳二极管DZ1提供箝位作用，防止PMOS 管的栅极和源极电压过高而损坏。本实施例的P型开关模块400实现了低压控制信号控制高压PMOS管的导通与截止。
应当说明的是，在本实施例的P型开关模块400中，所述JFET J1还可以采用其它电子元件代替，如高压NMOS管、NPN三极管等。另外，可控电流源I的关态电流可以调大，也可以进一步降低，以减小静态功耗。
请再次参阅图3，在本发明的动态配置分段LED驱动装置中，所述可调节LED灯串模块200包括第二可调节LED灯串单元220和单向导通单元230，所述第二可调节LED灯串单元220的P端（即positive）连接整流桥100的正输出端、还通过P型开关模块400连接单向导通单元230的负极和第一可调节LED灯串单元210的P端，所述第二可调节LED灯串单元220的N端（即negative）连接单向导通单元230的正极，所述第二可调节LED灯串单元220的N端通过第二N型开关模块320连接电流检测模块600，所述第一可调节LED灯串单元210的N端通过第一N型开关模块310连接电流检测模块600。
本发明实施例中，所述第二可调节LED灯串单元220与第一可调节LED灯串单元210的电路结构相同，并且均可以采用多种电路结构。如图5所示，所述第二可调节LED灯串单元220的一种电路结构包括第一LED灯串M1、第二LED灯串M2和第一P型开关单元410。所述第一LED灯串M1和第二LED灯串M2的电路结构相同，每个LED灯串均由若干个串联的LED灯组成，且所述第一LED灯串M1与第二LED灯串M2串联。
所述第一P型开关单元410的一端连接第一LED灯串M1的正极，第一P型开关单元410的另一端连接第一LED灯串M1的负极和第二LED灯串M2的正极，第一P型开关单元410的控制端连接控制逻辑模块500，所述第一LED灯串M1的正极连接整流桥100的正输出端，第二LED灯串M2的负极连接单向导通单元230的正极。
当第一P型开关单元410开启时，第一LED灯串M1处于熄灭状态，当第一P型开关单元410关断时，所述第一LED灯串M1点亮，从而可通过控制第一P型开关单元410的状态来控制LED灯串的点亮数量。
本实施例中，所述第一P型开关单元410与上述P型开关模块400的电路结构相同，其不同之处仅在于，第一P型开关单元410采用隔离型的低压PMOS管代替P型开关模块400中的高压PMOS管。隔离型的低压PMOS管的特性包括：（1）低压PMOS管的漏极与源极的电压差大于等于与第一P型开关单元410并联的第一LED灯串M1的正向电压之和；（2）其漏极、源极、栅极到芯片衬底的耐压大于最高的电源电压。
请参阅图3和图6，其为本发明第一较佳实施例提供的动态配置分段LED驱动装置中可调节LED灯串单元的另一实施例的电路图。该调节LED灯串单元即为第一可调节LED灯串单元210或者第二可调节LED灯串单元220。如图6所示，所述第二可调节LED灯串单元220包括第一LED灯串M1、第二LED灯串M2、第三LED灯串M3、第一P型开关单元410和第二P型开关单元420。所述第一LED灯串M1和第二LED灯串M2和第三LED灯串M3串联，所述第一P型开关单元410的一端连接第一LED灯串M1的正极，第一P型开关单元410的另一端连接第一LED灯串M1的负极和第二LED灯串M2的正极，第一P型开关单元410的控制端连接控制逻辑模块500；所述第二P型开关单元420的一端连接第二LED灯串M2的正极，第二P型开关单元420的另一端连接第二LED灯串M2的负极和第三LED灯串M3的正极，第二P型开关单元420的控制端连接控制逻辑模块500，所述第一LED灯串M1的正极连接整流桥的正输出端，第三LED灯串M3的负极连接单向导通单元230的正极。
该另一实施例与上述可调节LED灯串单元的一实施例的不同之处仅在于，在另一实施例中增加了一组P型开关单元和一组LED灯串，从而可通过这两个P型开关单元的开启与关断状态来调节LED灯串的点亮的数量，即可调节LED灯串的正向电压值最小为VFmin＝VF×M3，最大为VFmax=VF×(M1+M2+M3)。进一步地，在第一可调节LED灯串单元210和第二可调节LED灯串单元220中，P型开关单元和LED灯串还可以采用其它数量，
请同时参阅图3和图7，在本发明的动态配置分段LED驱动装置中，所述单向导通单元230包括二极管D1，所述二极管D1为高压二极管（其耐高压为311V以上），其正极连接第二可调节LED灯串单元220的N端，所述二极管D1的负极连接第一可调节LED灯串单元210的P端。
本实施例中，所述单向导通单元230仅工作在导通和断开两种状态，在导通状态时，要求其两端的压差尽量小；在断开状态时，其负端的电压大于其正端的电压，且要求不能有漏电。当然，本发明还可以采用其它具有该功能的单向导通器件如二极管连接的MOS管、晶体管等代替该二极管，本发明对单向导通器件采用的电子元件不作限制。
请同时参阅图3和图8，所述第一N型开关模块310包括第二MOS管Q2，所述第二MOS管Q2的栅极连接控制逻辑模块500，第二MOS管Q2的漏极连接第一可调节LED灯串单元210的N端，第二MOS管Q2的源极通过电流检测模块600接地。
相应地，请同时参阅图3和图9，所述第二N型开关模块320包括第三MOS管Q3，所述第三MOS管Q3的栅极连接控制逻辑模块500，第三MOS管Q3的漏极连接第二可调节LED灯串单元220的N端，第三MOS管Q3的源极通过电流检测模块600接地。
本实施例中，所述第一N型开关模块310和第二N型开关模块320的电路结构均相同。所述第二MOS管Q2和第三MOS管Q3均为高压NMOS管，第二MOS管Q2的耐压值高于第三MOS管Q3的耐压值。
本发明第二较佳实施例提供的动态配置分段LED驱动装置如图10所示，在该第二较佳实施例中，所述可调节LED灯串模块200、P型开关模块400和第二N型开关模块320为K个，其中，K为正整数。在上述第一较佳实施例中，K为等于1的正整数，而在本第二较佳实施例中，所述K为大于等于2的正整数。如图10所示，每一可调节LED灯串模块200均连接一P型开关模块400和一第二N型开关模块320，所述第一可调节LED灯串单元210通过第一N型开关模块310连接电流检测模块600。在图10所示的实施例中，P型开关模块400和第二N型开关模块320从左至右依次为第1、2…K个（如图10加粗字体所示的序号1、2…K），第二可调节LED灯串单元220从上至下依次为第1、2…K个（如图10加粗字体所示的序号1、2…K）。
由于第一可调节LED灯串单元210和第二可调节LED灯串单元220相同，第二N型开关模块320和第一N型开关模块310相同，为了便于描述，本发明将于第一可调节LED灯串单元210和第二可调节LED灯串单元220称为可调节LED灯串单元，将第二N型开关模块320和第一N型开关模块310称为N型开关模块。所以本第二较佳实施例的可调节LED灯串单元和N型开关模块的数量均为K+1个，并且N型开关模块由高压NMOS管构成，其耐压从第1个至第K+1个依次降低。
所述控制逻辑模块根据整流桥输出电压的变化输出控制信号控制所述第一可调节LED灯串单元、K个可调节LED灯串模块、K个P型开关模块、第一N型开关模块和K个第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和K个第二可调节LED灯串单元的串并联方式，实现N个可调LED灯串单元一组串联，然后各组并联；其中，N为1到K＋1的正整数。如图10所示，本第二较佳实施例提供的动态配置分段LED驱动装置，由电流检测模块600检测各N型开关模块中的电流，并反馈给控制逻辑模块500，由控制逻辑模块500根据电流反推整流桥100输出的电压，从而输出信号PEN<1:K>、LED_CTL1-LED_CTLK+1和NEN<1:K+1>控制各可调节LED灯串的串并状态和各可调节LED灯串中点亮LED的数量，从而动态配置点亮LED的数量。
以下以该第二较佳实施例对本发明的动态配置方法进行详细说明：
当整流桥100输出电压在VFmin与VFmax之间时，将所有可调节LED灯串单元并联在一起，此时所有的LED灯串均点亮。其实现方法为：将所有P型开关模块400（其为K个）和所有N型开关模块（其为K+1个）均开启，则所有单向导通单元230（其为K个）的正端通过相应的N型开关模块接到电流检测模块600最终到地，所有单向导通单元230的负端通过相应的P型开关模块400接到整流桥100的输出端，所有单向导通单元230处于反向截止状态，可调节LED灯串单元各自通过反向截止的单向导通单元230隔离开来。第二个可调节LED灯串单元至第K+1个可调节LED灯串单元的P端通过相应的P型开关模块400接在整流桥100正输出端上；所有可调LED灯串单元的N端通过N型开关模块接在电流检测模块600的第一端1，从而所有可调LED灯串单元均有电流流过，所有可调LED灯串单元均有光输出。
当整流桥100输出电压在VFmax与2VFmax之间时，将所有的所有可调LED灯串单元每两个串联然后再并联在一起，若可调LED灯串单元的数量不能被2整除，则控制多余的一个可调LED灯串单元处于熄灭的状态。实现方法为：控制逻辑模块500控制第一个P型开关模块400关断、第二个P型开关模块400开启，第一个N型开关模块关断、第二个N型开关模块开启，则第一个可调节LED灯串单元、第一个单向导通单元230、第二个可调节LED灯串单元接到整流桥100输出端和电流检测模块600之间，使第1、2个可调节LED灯串单元处于点亮状态；同理将第三个P型开关模块400关断、第四个P型开关模块400开启，第三个N型开关模块关断、第四个N型开关模块开启，使第三个可调LED灯串单元、第三个单向导通器件和第四个可调LED灯串接到整流桥100的输出端和电流检测模块600之间，第3、4个可调节LED灯串单元处于点亮状态；以此类推，控制第2N-1个P型开关模块400、及第2N-1个N型开关模块关断关断，第2N个P型开关模块400、及第2N个N型开关模块开启，使第2N-1个可调LED灯串单元、第2N-1个单向导通单元230和第2N个可调LED灯串单元接到整流桥100的输出端和电流检测模块600之间，使其处于点亮状态，从而实现可调LED灯串单元两两串联后再并联。
当整流桥100输出电压在2VFmax与3VFmax之间时，将所有的可调LED灯串单元每三个串联然后再并联在一起。若可调LED灯串单元的数量不能被3整除，则使多余的可调LED灯串单元处于熄灭状态。实现方法为：控制第1、2个P型开关模块400关断、第3个P型开关模块400开启，第1、2个N型开关模块关断、第3个N型开关模块开启，使第1-3个可调LED灯串单元、第1-2个单向导通单元230接到整流桥100的输出端和电流检测模块600之间，使第1-3个可调LED灯串单元处于点亮状态；同理控制第4、5个P型开关模块400关断、第6个P型开关模块400关断开启，控制第4、5个N型开关模块关断、第6个N型开关模块开启，使第4-6个可调LED灯串单元、第4-5个单向导通单元230接到整流桥100的输出端和电流检测模块600之间，使第4-6个可调LED灯串单元处于点亮状态；以此类推，控制第3N-2个、3N-1个P型开关模块400关断，及第3N-2个、3N-1个N型开关模块关断，并控制第3N个P型开关模块400及第3N个N型开关模块开启，使第3N-2个、3N-1个、3N个可调LED灯串单元、第3N-2个、3N-1个单元导通单元接到整流桥100的输出端和电流检测模块600之间，使第3N-2个、3N-1个、3N个可调LED灯串单元处于点亮状态。
以此类推，从而本发明可以实现P串Q并，其中P在1和K+1之间取整数值，Q的取值范围在1和（K+1）/P的之间整数。
本发明实施例还对应提供一种LED照明装置，其包括：用于对输入信号进行整流的整流桥和动态配置分段LED驱动装置，所述整流桥的正输出端连接动态配置分段LED驱动装置，整流桥的负输出端接地。交流市电AC从整流桥处接入，通过整流桥整流后输入动态配置分段LED驱动装置，由动态配置分段LED驱动装置根据整流桥的输出电压动态配置各可调节LED灯串单元的串并状态。由于上文对该动态配置分段LED驱动装置的电路结构和工作原理进行了详细描述，此处不再赘述。
与现有技术相比，本发明具有以下有益效果：
1、传统的AC LED驱动的光通量会随着电源电压的升高而升高。而采用要发明的动态配置分段LED驱动装置后，在低电压时将所有的灯串先并联，再根据电压变化将灯串分组串联后再并联，从而可以点亮尽量多的灯珠，保证可以输出更多的光能量。这样可以保证在整个电源变化的期间，大部分LED灯芯都在发光，光通量不会有太大的变动。
2、传统的AC LED驱动，在低压时点亮的部分灯串点亮，高压时全部灯串点亮，这样在一个正弦电压周期里，部分LED几乎全部都处于点亮状态，另外一部分LED（一般只有1/4或更少的时间）处于点亮状态，这样所有LED灯芯的衰减是不一致的，从而导致时间较长后，照明效果变差。采用要发明的动态配置分段LED驱动装置后，几乎所有LED灯芯点亮的时间是一致的，从而导致保证了长时间的照明效果的一致性。
3、采用要发明的动态配置分段LED驱动装置，灯芯几乎所有的时间都可以发光，提高了灯芯的利用率。
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。

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  1. 一种动态配置分段LED驱动装置，其与整流桥连接，其特征在于，包括：第一可调节LED灯串单元、第一N型开关模块、至少一可调节LED灯串模块、至少一P型开关模块、至少一第二N型开关模块、用于控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的工作的控制逻辑模块和用于检测第一N型开关模块和第二N型开关模块的输出电流并反馈给控制逻辑模块的电流检测模块；所述可调节LED灯串模块包括第二可调节LED灯串单元和单向导通单元；
    所述控制逻辑模块根据整流桥输出电压的变化输出控制信号控制所述第一可调节LED灯串单元、可调节LED灯串模块、P型开关模块、第一N型开关模块和第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和第二可调节LED灯串单元的串并联状态。
  2. 根据权利要求1所述的动态配置分段LED驱动装置，其特征在于，所述第二可调节LED灯串单元的P端连接整流桥的正输出端、还通过P型开关模块连接单向导通单元的负极和第一可调节LED灯串单元的P端，所述第二可调节LED灯串单元的N端连接单向导通单元的正极，所述第二可调节LED灯串单元的N端通过第二N型开关模块连接电流检测模块，所述第一可调节LED灯串单元的N端通过第一N型开关模块连接电流检测模块。
  3. 根据权利要求2所述的动态配置分段LED驱动装置，其特征在于，所述第二可调节LED灯串单元包括第一LED灯串、第二LED灯串和第一P型开关单元；所述第一LED灯串和第二LED灯串串联，所述第一P型开关单元的一端连接第一LED灯串的正极，第一P型开关单元的另一端连接第一LED灯串的负极和第二LED灯串的正极，第一P型开关单元的控制端连接控制逻辑模块，所述第一LED灯串的正极连接整流桥的正输出端，第二LED灯串的负极连接单向导通单元的正极。
  4. 根据权利要求2所述的动态配置分段LED驱动装置，其特征在于，所述第二可调节LED灯串单元包括第一LED灯串、第二LED灯串、第三LED灯串、第一P型开关单元和第二P型开关单元；所述第一LED灯串和第二LED灯串和第三LED灯串串联，所述第一P型开关单元的一端连接第一LED灯串的正极，第一P型开关单元的另一端连接第一LED灯串的负极和第二LED灯串的正极，第一P型开关单元的控制端连接控制逻辑模块；所述第二P型开关单元的一端连接第二LED灯串的正极，第二P型开关单元的另一端连接第二LED灯串的负极和第三LED灯串的正极，第二P型开关单元的控制端连接控制逻辑模块，所述第一LED灯串的正极连接整流桥的正输出端，第三LED灯串的负极连接单向导通单元的正极。
  5. 根据权利要求3或4所述的动态配置分段LED驱动装置，其特征在于，所述单向导通单元包括二极管，所述二极管的正极连接第二可调节LED灯串单元的N端，所述二极管的负极连接第一可调节LED灯串单元的P端。
  6. 根据权利要求2所述的动态配置分段LED驱动装置，其特征在于，所述第一N型开关模块包括第二MOS管，所述第二MOS管的栅极连接控制逻辑模块，第二MOS管的漏极连接第一可调节LED灯串单元的N端，第二MOS管的源极通过电流检测模块接地；
    所述第二N型开关模块包括第三MOS管，所述第三MOS管的栅极连接控制逻辑模块，第三MOS管的漏极连接第二可调节LED灯串单元的N端，第三MOS管的源极通过电流检测模块接地。
  7. 根据权利要求1所述的动态配置分段LED驱动装置，其特征在于，所述P型开关模块包括可控电流源、JFET、第一电阻、齐纳二极管和第一MOS管；所述可控电流源连接控制逻辑模块，可控电流源的一端连接所述JFET的源极，可控电流源的另一端接地；所述JFET的漏极连接第一MOS管的栅极、还通过第一电阻连接第一MOS管的源极，JFET的栅极接地；所述齐纳二极管的正极连接第一MOS管的栅极，齐纳二极管的负极连接第一MOS管的源极；所述第一MOS管的漏极连接可调节LED灯串模块和第一可调节LED灯串单元，所述第一MOS管的源极连接所述整流桥的正输出端。
  8. 根据权利要求1所述的动态配置分段LED驱动装置，其特征在于，所述可调节LED灯串模块、P型开关模块和第二N型开关模块为K个，其中，K为正整数；
    所述控制逻辑模块根据整流桥输出电压的变化输出控制信号控制所述第一可调节LED灯串单元、K个可调节LED灯串模块、K个P型开关模块、第一N型开关模块和K个第二N型开关模块的启闭状态，动态调节第一可调节LED灯串单元和K个第二可调节LED灯串单元的串并联方式，实现N个可调LED灯串单元一组串联，然后各组并联；其中，N为1到K＋1的正整数。
  9. 一种LED照明装置，其特征在于，包括：用于对输入信号进行整流的整流桥和如权利要求1-8所述的动态配置分段LED驱动装置，所述整流桥的正输出端连接动态配置分段LED驱动装置，整流桥的负输出端接地。
PCT/CN2014/081411 2013-07-31 2014-07-01 动态配置分段led驱动装置和led照明装置 WO2015014192A1 (zh)

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