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WO2019080549A1 - Circuit d'attaque à courant constant de del et lampe - Google Patents

Circuit d'attaque à courant constant de del et lampe

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Publication number
WO2019080549A1
WO2019080549A1 PCT/CN2018/095686 CN2018095686W WO2019080549A1 WO 2019080549 A1 WO2019080549 A1 WO 2019080549A1 CN 2018095686 W CN2018095686 W CN 2018095686W WO 2019080549 A1 WO2019080549 A1 WO 2019080549A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp group
constant current
led
module
switching device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/095686
Other languages
English (en)
Chinese (zh)
Inventor
李照华
于井亮
方吉桐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Sunmoon Microelectronics Co Ltd
Original Assignee
Shenzhen Sunmoon Microelectronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Sunmoon Microelectronics Co Ltd filed Critical Shenzhen Sunmoon Microelectronics Co Ltd
Publication of WO2019080549A1 publication Critical patent/WO2019080549A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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 invention relates to the field of LED constant current driving technology, in particular to an LED constant current driving circuit and a lamp.
  • the LED lamp group with load is two strings of independent LED lamp groups.
  • the basic principle of operation is that two strings of lamps work in series when the voltage is high, and two strings of lamps work in parallel when the voltage is low.
  • the use of this drive scheme is less costly, but less flexible, and it is not possible to drive some luminaires that have only a single string of LEDs. The LEDs of such luminaires can be tapped out between the LED beads.
  • the object of the present invention is to solve at least one of the above technical drawbacks, in particular, a technical drawback of poor flexibility.
  • the present invention provides an LED constant current driving circuit, comprising: a power supply module, a detection control module, an N-string LED sub-light group connected in series, N constant current control modules, and N-1 controllable switch modules. Wherein N ⁇ 2; the power supply module is connected in series with the N-string LED sub-light group to provide a supply voltage, and each string of LED sub-light groups is remote from the end of the power supply module, and the connection line is connected to the corresponding constant current control module and then grounded.
  • the constant current control module passes the corresponding LED sub-light group through a constant output current; the N-1 string LED sub-light group in the N-string LED sub-group has a corresponding controllable switch module in parallel; the detection control module And configured to detect the power supply voltage provided by the power supply module, and output N constant current control signals and N-1 switch control signals according to the magnitude of the power supply voltage, where the N constant current control signals respectively control corresponding
  • the constant current control module, the N-1 switch control signals respectively control the closing of the corresponding controllable switch module to short the corresponding LED sub-light group to control the N-string LED sub-light group to alternately emit light.
  • the N-string LED sub-light group is composed of a single string of LED mother lamp groups, and the constant-current control module is connected from the LED bus light group to the corresponding constant current control module and then grounded.
  • each string of LED sub-lamp sets has the same illumination power under the same operating conditions.
  • controllable switch module comprises a controllable switching device or a controllable switching device combination.
  • the two strings of LED sub-light groups are the lamp group A and the lamp group B connected in series, which respectively correspond to the constant current control modules U1 and U2, and the lamp group A is close to the power supply module.
  • the controllable switch module connected in parallel with the lamp group A is K1; the constant current control signal corresponding to K1 is EN1, and the constant current control signals corresponding to U1 and U2 are EN2 and EN3 respectively; when the detection control module detects the supply voltage is In the low voltage range, control EN1, EN2, EN3, so that: when K1 is off, U1 is turned on; when K1 is turned on, U1 is turned off and U2 is turned on; thus, lamp group A and lamp group B are alternately illuminated; wherein EN1 EN2 is the PWM signal.
  • control EN1, EN2, and EN3 when the detection control module detects that the supply voltage is in a high voltage range, control EN1, EN2, and EN3 so that: K1, U1 are turned off, U2 is turned on, and thus the lamp group A, the lamp Group B emits light at the same time.
  • controllable switch module K1 includes a controllable switching device Q1 and a controllable switching device Q2.
  • the controllable switching device Q1 is connected in parallel with the lamp group A, and the control end of the controllable switching device Q1 is controllable.
  • the switching device Q2 is grounded, and the detection control module is connected to the control terminal of the controllable switching device Q2 to output EN1.
  • EN1 and EN2 are PWM signals with a duty ratio of n%, and the output currents of U1 and U2 are controlled to be IMAX, where n 0 to 100; when the detection control module detects that the supply voltage is in a high voltage range, the output currents of the controls U1 and U2 are IMAX ⁇ m%, where m is 0 to 100; when n or m is equal to or approximately equal At 50 o'clock, when the supply voltage is in the low voltage range and the high voltage range, the luminous powers of the lamp group A and the lamp group B are the same.
  • the three strings of LED sub-light groups are the lamp group A, the lamp group B, and the lamp group C connected in series, corresponding to the constant current control modules U1, U2, U3, and the lamp group A, respectively.
  • the controllable switch module connected in parallel with the lamp group A is K1
  • the controllable switch module in parallel with the lamp group B is K2
  • the constant current control signal corresponding to K1 is EN1
  • the constant current control signal corresponding to K2 is
  • the constant current control signals corresponding to EN3, U1, U2, and U3 are EN2, EN4, and EN5; when the detection control module detects that the supply voltage is in a low voltage range, control EN1, EN2, EN3, EN4, and EN5 to So that when K1 is disconnected, U1 is turned on; when K2 is off, U2 is turned on, K1 is turned on, and U1 is turned off; when both K1 and K2 are turned on, U1 and U2 are turned off and U3 is turned on; thus, lamp group A
  • control EN1, EN2, EN3, EN4, EN5 such that: K1, K2, U1, U2 are all disconnected and U3 It is turned on, so that the lamp group A, the lamp group B, and the lamp group C emit light at the same time.
  • controllable switch module K1 includes a controllable switching device Q1 and a controllable switching device Q2.
  • the controllable switching device Q1 is connected in parallel with the lamp group A, and the control end of the controllable switching device Q1 is controllable.
  • the switch device Q2 is grounded;
  • the controllable switch module K2 comprises a controllable switch device Q3 and a controllable switch device Q4, the controllable switch device Q3 is connected in parallel with the lamp group B, and the control end of the controllable switch device Q3 passes through the controllable switch device Q4 is grounded;
  • the detection control module is connected to the control terminal of the controllable switching device Q2 to output EN1, and the detection control module is connected to the control terminal of the controllable switching device Q4 to output EN3.
  • EN1, EN2, EN3, EN4, and EN5 are PWM signals with a duty ratio of n%, and control U1, U2, and U3.
  • the output current is IMAX ⁇ n%, where n is 0 to 100; when the detection control module detects that the supply voltage is in a high voltage range, the output currents of the controls U1, U2, and U3 are IMAX, where m is 0 to 100; when n or m is equal to or about equal to 100/3, when the supply voltage is in the low voltage range and the high voltage range, the luminous powers of the lamp group A, the lamp group B, and the lamp group C are the same.
  • the present invention also provides a light fixture comprising the LED constant current driving circuit according to the above first aspect.
  • the above LED constant current driving circuit and the luminaire comprise: a power supply module, a detection control module, a series of N string LED sub-light groups, N constant current control modules, N-1 controllable switch modules, wherein N ⁇ 2;
  • the power supply module is connected in series with the N-string LED sub-light group to provide a supply voltage.
  • Each string of LED sub-light groups is remote from the end of the power supply module, and the connection line is connected to the corresponding constant current control module and then grounded.
  • the constant current control module makes corresponding The LED sub-light group passes a constant output current; the N-1 string LED sub-light group in the N-string LED sub-light group is respectively connected with a corresponding controllable switch module; the detection control module is configured to detect the power supply The power supply voltage provided by the module, and outputting N constant current control signals and N-1 switch control signals according to the magnitude of the power supply voltage, wherein the N constant current control signals respectively control corresponding constant current control modules, The N-1 switch control signals respectively control the closing of the corresponding controllable switch module to short the corresponding LED sub-light group to control the N-string LED sub-light group to alternately emit light.
  • the detection control module can control the illumination of the LED sub-light group according to the magnitude of the power supply voltage.
  • all the LED sub-light groups can be simultaneously illuminated at a high voltage of 220V, and the LED sub-light groups alternately emit light at a low voltage of 120V, and the flexibility is extremely high, and Even if the N-string LED sub-light group is formed by a single-string LED main lamp group through an intermediate tap lead output line, it can be driven.
  • 1 is a block diagram of an LED constant current driving circuit of an embodiment
  • FIG. 2 is a schematic diagram of a power supply module of an embodiment
  • Figure 3 is a schematic view of a separate series of mother lamp sets of one embodiment
  • FIG. 4 is a block diagram of an LED constant current driving circuit when the sub-lamp group is two sets according to an embodiment
  • 5 is a block diagram of an LED constant current driving circuit when the sub-lamp group is two groups according to another embodiment
  • FIG. 6 is a waveform diagram of respective control signals when a sub-lamp group is two sets and a low voltage of 120V is used in one embodiment
  • FIG. 7 is a schematic diagram showing current flow when a sub-lamp group is two sets at a low voltage of 120V according to an embodiment
  • FIG. 8 is a waveform diagram of respective control signals when a sub-lamp group is two sets with a 220V high voltage according to an embodiment
  • FIG. 9 is a block diagram of an LED constant current driving circuit when the sub-lamp group is three sets according to an embodiment
  • FIG. 10 is a waveform diagram of respective control signals when a sub-lamp group is three sets and a low voltage of 120V is used in an embodiment
  • Figure 11 is a waveform diagram of respective control signals when a sub-lamp group is three sets at 220V high voltage.
  • FIG. 12 is a waveform diagram of respective control signals when a sub-lamp group is three sets with a 220V high voltage according to another embodiment.
  • FIG. 1 is a block diagram of an LED constant current driving circuit of an embodiment, see FIG. 1.
  • the invention provides an LED constant current driving circuit, comprising: a power supply module P, a detection control module M, a series of N strings of LED sub-light groups (LED lamp group 1 to LED lamp group N), and N constant current control modules ( U1 ⁇ UN), N-1 controllable switch modules (K1 ⁇ KN-1), where N ⁇ 2.
  • the power supply module P is connected in series with the N-string LED sub-light group to provide a supply voltage.
  • Each string of LED sub-light groups is remote from the end of the power supply module P, and the connection line is connected to the corresponding constant current control module and then grounded.
  • the constant current control module makes the corresponding LED
  • the sub-lamp group passes a constant output current.
  • the N-1 string LED sub-light groups in the N-string LED sub-light group are respectively connected with corresponding controllable switch modules.
  • the detection control module M is configured to detect the supply voltage provided by the power supply module P, and output N constant current control signals (G1 to GN) and N-1 switch control signals (S1 to SN-1) according to the magnitude of the power supply voltage.
  • the N constant current control signals respectively control the corresponding constant current control modules, and the N-1 switch control signals respectively control the closing of the corresponding controllable switch modules to short the corresponding LED sub-light groups to control the N strings of LEDs
  • the sub-lamp sets alternately illuminate.
  • the detection control module M can control the N-string LED sub-light group to emit only one string of LED sub-light groups at the same time, and the N-series LED sub-light groups alternately emit light in sequence during the set cycle.
  • the power supply module P includes a winding resistance FR1, a rectifier bridge DB1, a filter capacitor E1, and a discharge resistor R1.
  • One end of the winding resistance FR1 is connected to the L line of the power supply input voltage
  • the other end of the winding resistance FR1 is connected to the positive input terminal of the rectifier bridge DB1
  • the N line of the input voltage is connected to the negative input terminal of the rectifier bridge DB1.
  • the positive output end of the rectifier bridge DB1 is connected to the positive pole of the filter capacitor E1, and the N-string LED sub-light group is connected in series.
  • the negative output of the rectifier bridge DB1 is connected to the system ground.
  • the negative pole of the filter capacitor E1 is connected to the ground.
  • One end of the discharge resistor R1 is connected to the anode of the filter capacitor E1, and the other end of the discharge resistor R1 is connected to the system ground.
  • Each constant current control module may include a constant current control chip to output a constant current.
  • the controllable switch module includes a controllable switching device that shorts the LED sub-light group in parallel with the controllable switch module by controlling the closing of the controllable switching device.
  • the controllable switching device may be a switching type semiconductor device such as a field effect MOS transistor, a thyristor, a transistor or the like, or a device combination having an equivalent effect, which is a field effect MOS transistor in this embodiment.
  • the N-string LED sub-light group is composed of a single string of LED mother lamp groups, and the constant-current control module corresponding to the connection line is tapped from the LED mother lamp group and then grounded.
  • FIG. 3 is a schematic diagram of a separate series of mother lamp sets of one embodiment.
  • the group of lamp sets includes two sets of LED sub-lamp sets.
  • each string of LED sub-lamps has the same illumination power under the same operating conditions, for example, the strings of LED sub-lamps are the same, ie have the same LED lamp beads of quantity, specification and connection mode, so that they can have the same luminous power under the same voltage and current.
  • Each LED sub-light group can include a plurality of parallel LED branches.
  • the LED sub-lamp group in order to filter out clutter to make the LED more stable, the LED sub-lamp group can also have a capacitor in parallel, and a diode in series.
  • N there may be different circuit structures, resulting in different control methods, but all based on the same working principle, that is, controlling the closing of the controllable switch module to short the corresponding LED sub-light group,
  • FIG. 4 is a block diagram of an LED constant current driving circuit module when the sub-lamp group is two groups according to an embodiment, please refer to FIG. 4.
  • the two strings of LED sub-light groups are the lamp group A and the lamp group B connected in series, respectively corresponding to the constant current control modules U1 and U2, and the lamp group A is close to the power supply module P ( That is, the power supply module P is connected to the lamp group A and the lamp group B) in turn, and the controllable switch module connected in parallel with the lamp group A is K1, the constant current control signal corresponding to K1 is EN1, and the constant current control signal corresponding to U1 and U2 is EN2 respectively. And EN3.
  • the lamp group A and the lamp group B may belong to the same whole LED lamp group, and are divided into a lamp group A and a lamp group B by tapping the output lines in the middle of the whole string of LED lamp groups, and the lamp group A and the lamp group B are working in the same work.
  • the same luminous power is available under the conditions.
  • FIG. 5 is a block diagram of an LED constant current driving circuit module when the sub lamp group is two groups according to another embodiment, please refer to FIG. 5.
  • the power supply module P is connected to the lamp group A through the diode D2
  • the lamp group A is connected in series with the lamp group B
  • the lamp group B is connected to the U2 through the diode D3.
  • the controllable switch module K1 comprises a controllable switching device Q1 and a controllable switching device Q2.
  • the controllable switching device Q1 is connected in parallel with the lamp group A, and the control end of the controllable switching device Q1 is grounded through the controllable switching device Q2, the detection control module M is connected to the control terminal of the controllable switching device Q2 to output EN1.
  • the controllable switching devices Q1 and Q2 can be N-channel type field effect MOS transistors.
  • the drain of Q1 is connected to the current input terminal of lamp group A, the source of Q1 is connected to the current output terminal of lamp group A, and the drain of Q2 is connected to Q1.
  • the gate of the gate, the source of Q2 is grounded, and the detection control module M is connected to the gate of Q2 to output EN1.
  • a resistor R2 is connected between the drain and the gate of Q1, and a Zener diode ZD1 is connected between the source and the gate of Q1.
  • the anode of ZD1 is connected to the source of Q1, and the cathode of ZD1 is connected to the gate of Q1.
  • the drain of Q2 may be connected to the gate of Q1 through a current limiting device, or the source of Q1 may be connected to the current output of the lamp group A through a current limiting device, for example, via diode D1, D1
  • the anode of the anode is connected to the source of Q1
  • the cathode of the anode of D1 is connected to the current output of the lamp group A.
  • the constant current control modules U1 and U2 are controllable and can be controlled by EN2 and EN3. For example, when EN2 is high level “1”, U1 operates to output constant current, while when low level is "0", U1 is turned off; U2 operates to output a constant current when EN3 is "1" high, and U2 is off when it is low "0.”
  • FIG. 6 is a waveform diagram of each control signal when the sub-lamp group is two sets and the 120V low voltage is used in an embodiment, please refer to FIG. 6.
  • the detection control module M detects that the power supply voltage is in a low voltage range (for example, about 120V, for example, 110V to 130V), it controls EN1, EN2, and EN3 so that U1 is turned on when K1 is turned off and U1 is turned off when K1 is turned on.
  • the U2 is turned on; and the lamp group A and the lamp group B are sequentially alternately illuminated.
  • EN1 and EN2 are PWM signals.
  • U1 is turned on when K1 is turned off, U1 is turned off when K1 is turned on, and U2 can be kept turned on all the time. Therefore, EN1 and EN2 can be the same PWM signal, while EN3 can be a high level signal.
  • the lighting of the light group A and the light group B can be controlled.
  • EN1 and EN2 output a PWM control signal and EN3 outputs a high-level digital signal
  • the lamp group A and the lamp group B are in a turn-on state to alternately emit light, wherein the frequency of the PWM control signal is not limited.
  • FIG. 7 is a schematic diagram showing current flow when a sub-lamp group is two sets at a low voltage of 120 V according to an embodiment.
  • current A is a current direction when only the lamp group A is turned on
  • current B is a lamp group B only. The current trend of the current time.
  • EN1 and EN2 are PWM control signals, wherein the duty cycle of the PWM control signal is n% (n is 0 to 100, for example 50%, ie duty ratio 1/2), and the operating current of lamp group A and lamp group B is Waveform in the form of n% duty cycle.
  • the current values set by the flow control modules U1 and U2 are equal to IMAX, and the total output power of the lamp group A and the lamp group B is:
  • EN1 and EN2 are PWM signals with a duty ratio of 1/2, and the output currents of the control U1 and U2 are IMAX.
  • control EN1, EN2, and EN3 When the detection control module M detects that the power supply voltage is in a high voltage range (for example, 210V to 230V), control EN1, EN2, and EN3 so that: K1, U1 are turned off, U2 is turned on, and thus the light group A, the light group B Light at the same time.
  • a high voltage range for example, 210V to 230V
  • FIG. 8 is a waveform diagram of each control signal when the sub-lamp group is two sets and 220V high voltage in one embodiment, please refer to FIG. 8.
  • EN1 is "1”
  • EN2 is "0”
  • EN3 is “1”
  • the lamp group A and the lamp group B are in an on state.
  • EN1 is "1”
  • the field effect MOS transistor Q2 of the constant current output unit is in an on state. Because the source of the field effect MOS transistor Q2 is connected to the system ground, the drain of the field effect MOS transistor Q2 is at a low potential, and the drain of the field effect MOS transistor Q2 is connected to the gate of the field effect MOS transistor Q1. At this time, the field effect MOS transistor Q1 is in the off state.
  • the power is equal, which can be equivalently understood as the input power of the system is basically equal, and the brightness of the lamps is substantially equal.
  • FIG. 9 is a block diagram of an LED constant current driving circuit module when the sub-light group is three groups according to an embodiment, and FIG.
  • the three strings of LED sub-light groups are the lamp group A, the lamp group B, and the lamp group C connected in series, corresponding to the constant current control modules U1, U2, U3, and the lamp group A, respectively.
  • the controllable switch module parallel to the light group A is K1
  • the controllable switch module parallel to the light group B is K2.
  • the constant current control signal corresponding to K1 is EN1
  • the constant current control signal corresponding to K2 is EN3
  • the constant current control signals corresponding to U1, U2, and U3 are EN2, EN4, and EN5, respectively.
  • the lamp group A, the lamp group B, and the lamp group C may belong to the same whole LED lamp group, and are divided into a lamp group A, a lamp group B and a lamp group C by using the tap output output lines in the middle of the whole series of LED lamp groups. A.
  • Lamp group B and lamp group C have the same luminous power under the same operating conditions.
  • the controllable switch module K1 comprises a controllable switching device Q1 and a controllable switching device Q2.
  • the controllable switching device Q1 is connected in parallel with the lamp group A.
  • the control terminal of the controllable switching device Q1 is grounded through the controllable switching device Q2, and the detection control module M is connected to the control terminal of the controllable switching device Q2 to output EN1.
  • the controllable switching devices Q1 and Q2 can be N-channel type field effect MOS transistors.
  • the drain of Q1 is connected to the current input terminal of lamp group A, the source of Q1 is connected to the current output terminal of lamp group A, and the drain of Q2 is connected to Q1.
  • the gate of the gate, the source of Q2 is grounded, and the detection control module M is connected to the gate of Q2 to output EN1.
  • a resistor R2 is connected between the drain and the gate of Q1, and a Zener diode ZD1 is connected between the source and the gate of Q1.
  • the anode of ZD1 is connected to the source of Q1, and the cathode of the cathode is connected to the gate of Q1.
  • the drain of Q2 may be connected to the gate of Q1 through a current limiting device, or the source of Q1 may be connected to the current output of the lamp group A through a current limiting device, for example, by diode D1, D1
  • the anode of the anode is connected to the source of Q1
  • the cathode of the anode of D1 is connected to the current output of the lamp group A.
  • the controllable switch module K2 comprises a controllable switching device Q3 and a controllable switching device Q4.
  • the controllable switching device Q3 is connected in parallel with the lamp group B.
  • the control terminal of the controllable switching device Q3 is grounded through the controllable switching device Q4, and the detection control module M is connected to the control terminal of the controllable switching device Q4 to output EN3.
  • the controllable switching devices Q3 and Q4 can be N-channel type field effect MOS transistors, the drain of Q3 is connected to the current input terminal of lamp group B, the source of Q3 is connected to the current output terminal of lamp group B, and the drain of Q4 is connected to Q3.
  • the gate of the gate, the source of Q4 is grounded, and the detection control module M is connected to the gate of Q4 to output EN3.
  • a resistor R3 is connected between the drain and the gate of Q3, and a Zener diode ZD2 is connected between the source and the gate of Q3.
  • the anode of ZD2 is connected to the source of Q3, and the cathode is connected to the gate of Q3.
  • the drain of Q4 may be connected to the gate of Q3 through a current limiting device, or the source of Q3 may be connected to the current output of the lamp group B through a current limiting device, for example, via diode D2, D2
  • the anode of the anode is connected to the source of Q3, and the cathode of the cathode of D2 is connected to the current output of the lamp group B.
  • the constant current control modules U1, U2, and U3 are controllable and can be controlled by EN2, EN4, and EN5. For example, when EN2 is high level "1", U1 operates to output constant current, while low level is "0". U1 is disconnected; when EN4 is high level "1", U2 operates to output constant current, while when low level is "0", U2 is turned off; when EN5 is high level "1", U3 operates to output constant current, and U3 is off when it is low "0".
  • FIG. 10 is a waveform diagram of respective control signals when the sub-lamp group is three sets at a low voltage of 120 V according to an embodiment, see FIG.
  • the detection control module M detects that the power supply voltage is in a low voltage range (for example, about 120V, for example, 110V to 130V), it controls EN1, EN2, EN3, EN4, and EN5 so that U1 is turned on when K1 is off; K2 is off.
  • a low voltage range for example, about 120V, for example, 110V to 130V
  • EN1, EN2, EN3, EN4, and EN5 so that U1 is turned on when K1 is off; K2 is off.
  • U2 When open, U2 is turned on, K1 is turned on, and U1 is turned off; when both K1 and K2 are turned on, U1 and U2 are turned off and U3 is turned on; thus, lamp group A, lamp group B, and lamp group C are sequentially alternately illuminated; EN2, EN3, EN4, and EN5 are PWM signals.
  • EN1 and EN2 can be the same PWM signal
  • EN3 and EN4 can be the same PWM signal
  • EN1, EN2, EN3, EN4, and EN5 are PWM signals with a duty ratio of n%, where n is 0 to 100.
  • the total voltage drop is ULED
  • the voltages of the lamp group A, the lamp group B, and the lamp group C are respectively U LEDA , U LEDB , U LEDC , and each constant current control
  • the module sets the current to IMAX, then:
  • Lamp group B power P LEDB U LEDB *I MAX *nB% (Equation 5)
  • the detection control module M detects that the power supply voltage is in a high voltage range (for example, about 220V, for example, 210V to 230V).
  • a high voltage range for example, about 220V, for example, 210V to 230V
  • the first control mode will be described below, and FIG. 11 is an embodiment. Please refer to Figure 11 for the waveforms of the control signals when the sub-lamp group is 3 sets at 220V high voltage.
  • Mode 1 Control EN1, EN2, EN3, EN4, EN5 so that: K1, K2, U1, U2 are all turned off and U3 is turned on, so that lamp group A, lamp group B, and lamp group C emit light at the same time.
  • Equation 7 and Equation 8 the total output power of the lamp group A, the lamp group B, and the lamp group C is the same when the power supply voltage is high and low voltage.
  • the output current is IMAX; when the detection control module M detects that the supply voltage is in a high voltage range, the output currents of the controls U1, U2, and U3 are IMAX ⁇ 1/3.
  • nA is equal to or approximately equal to 100/3
  • the light-emitting power of the lamp group A, the lamp group B, and the lamp group C is the same when the power supply voltage is the low voltage range and the high voltage range.
  • the second control mode, mode 2 lamp group A, lamp group B, and lamp group C are sequentially superimposed and illuminated in one line voltage cycle, and by setting EN1 to EN5, as the line voltage increases, when the line voltage satisfies the lamp group
  • EN1 EN5
  • K1 is turned off
  • U1 is turned on to make the light group A emit light
  • K2 is turned on
  • K2 the light is turned on by K2
  • the light is turned on, so that the light group B also emits light, that is, the light group A
  • the lamp group B emits light at the same time
  • the lamp group C also emits light by U3 conduction, that is, the three lamp groups simultaneously emit light.
  • FIG. 12 is a waveform diagram of each control signal when the sub-lamp group is three sets with a 220V high voltage according to another embodiment, see FIG. Therefore, the lamp group A, the lamp group B, and the lamp group C can be sequentially superimposed and emitted in one line voltage period.
  • the current duty cycles of lamp group A, lamp group B, and lamp group C are nA%, nB%, and nC%, respectively, and the operating currents are set to I LEDA , I LEDB , I LEDC , where I LEDA ⁇ I LEDB ⁇ I LEDC , the total output power of the 3 lamp sets is:
  • P LED - High Voltage Input 2 U LEDA *I LEDA *nA%+(U LEDA +U LEDB )*I LEDB *nA%+(U LEDA +U LEDB +U LEDC )*I LEDC *nA%
  • P LED - high voltage input 2 P LED - low voltage input
  • the present invention also provides an LED lamp comprising the LED constant current driving circuit according to any of the above embodiments.
  • some or all of the power supply module, the detection control module, the N constant current control modules, and the N-1 controllable switch modules may be integrated into the same integrated circuit, and the N string is controlled by the integrated circuit. LED sub-light group.
  • the LED constant current driving circuit and the luminaire comprise: a power supply module, a detection control module, an N-string LED sub-light group connected in series, N constant current control modules, and N-1 controllable switch modules, wherein N ⁇ 2;
  • the power supply module is connected in series with the N-string LED sub-light group to provide a supply voltage.
  • Each string of LED sub-light groups is remote from the end of the power supply module, and the connection line is connected to the corresponding constant current control module and then grounded.
  • the constant current control module makes the corresponding LED sub-controller
  • the lamp group passes a constant output current
  • the N-1 string LED sub-light group in the N-string LED sub-light group is respectively connected with a corresponding controllable switch module
  • the detection control module is configured to detect the supply voltage provided by the power supply module And outputting N constant current control signals and N-1 switch control signals according to the magnitude of the power supply voltage, wherein the N constant current control signals respectively control corresponding constant current control modules, and the N-1 switch control signals respectively Controlling the closing of the corresponding controllable switch module to short the corresponding LED sub-light group to control the N-string LED sub-light group to alternately emit light.
  • the detection control module can control the illumination of the LED sub-light group according to the magnitude of the power supply voltage.
  • all the LED sub-light groups can be simultaneously illuminated at a high voltage of 220V, and the LED sub-light groups alternately emit light at a low voltage of 120V, and the flexibility is extremely high, and Even if the N-string LED sub-light group is formed by a single-string LED main lamp group through an intermediate tap lead output line, it can be driven.

Landscapes

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

Abstract

L'invention concerne un circuit d'attaque à courant constant de DEL, comprenant : un module d'alimentation électrique, un module de commande de détection, N chaînes d'ensembles de sous-lampes à DEL qui sont connectés en série, N Modules de commande à courant constant et N -1 modules de commutation pouvant être commandés, N étant supérieur ou égal à 2. Le module d'alimentation électrique est connecté en série aux N chaînes d'ensembles de sous-lampes à DEL pour fournir une tension d'alimentation. Un fil de connexion sort d'une extrémité, qui est éloignée du module d'alimentation électrique, de chaque chaîne d'ensembles de sous-lampes à DEL à connecter à un module de commande à courant constant correspondant, puis est mis à la terre. Le module de commande à courant constant fait passer un courant de sortie constant à travers le sous-ensemble de lampes à DEL correspondant. Les (N-1) chaînes d'ensembles de sous-lampes à DEL sont connectées avec des modules de commutation correspondants pouvant être commandés en parallèle. Le module de commande de détection est utilisé pour détecter la tension d'alimentation fournie par le module d'alimentation électrique et délivre N signaux de commande de courant constant et (N-1) signaux de commande de commutation en fonction de l'amplitude de la tension d'alimentation pour commander respectivement le module de commande à courant constant correspondant. Les (N-1) signaux de commande de commutation commutent respectivement pour allumer ou éteindre le module de commutation commandable correspondant pour réaliser un court-circuit de l'ensemble de sous-lampes à DEL correspondant, pour ainsi ordonner aux N chaînes d'ensembles de sous-lampes à DEL de manière à émettre de la lumière en alternance. L'invention concerne en outre une lampe.
PCT/CN2018/095686 2017-10-27 2018-07-13 Circuit d'attaque à courant constant de del et lampe Ceased WO2019080549A1 (fr)

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CN109348582B (zh) * 2018-11-29 2024-06-25 华南理工大学 一种精细调光的四通道ac led驱动芯片电路
CN109348601B (zh) * 2018-12-20 2023-06-16 青岛亿联客信息技术有限公司 一种彩光灯驱动电路及其驱动方法

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