WO2011060700A1 - 多路恒流驱动电路 - Google Patents

多路恒流驱动电路 Download PDF

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Publication number
WO2011060700A1
WO2011060700A1 PCT/CN2010/078714 CN2010078714W WO2011060700A1 WO 2011060700 A1 WO2011060700 A1 WO 2011060700A1 CN 2010078714 W CN2010078714 W CN 2010078714W WO 2011060700 A1 WO2011060700 A1 WO 2011060700A1
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WO
WIPO (PCT)
Prior art keywords
winding
circuit
power supply
rectifying
secondary winding
Prior art date
Application number
PCT/CN2010/078714
Other languages
English (en)
French (fr)
Inventor
葛良安
姚晓莉
华桂潮
吴新科
任丽君
Original Assignee
英飞特电子（杭州）有限公司
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
Priority claimed from CN200910225966A external-priority patent/CN101702854A/zh
Priority claimed from CN2009202733529U external-priority patent/CN201585177U/zh
Application filed by 英飞特电子（杭州）有限公司 filed Critical 英飞特电子（杭州）有限公司
Priority to US13/511,059 priority Critical patent/US8629664B2/en
Publication of WO2011060700A1 publication Critical patent/WO2011060700A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H05B45/37—Converter circuits
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges

Definitions

  • the invention relates to the field of constant current driving technology, and in particular to a multi-channel constant current driving circuit.
  • Figure 1 shows a multi-channel LED driven LED constant current control circuit in the prior art.
  • the input voltage Vac passes through the constant voltage module as the input of the multi-channel non-isolated DC/DC constant current module, and each non-isolated DC/DC constant current module performs constant current control alone.
  • the voltage of the constant voltage module and the voltage of the LED generally have a large voltage difference, the efficiency of the rear multi-channel non-isolated DC/DC constant current module is not too high, and the multi-channel non-isolated DC/DC
  • the constant current module has a complicated structure and high cost.
  • the first inductance Leal of the coupled inductor Lea is connected in series in the DC circuit after diode D1 and D2 rectification, and is coupled.
  • the second inductance Lca2 of the inductor Lea is connected in series in the DC circuit rectified by the diodes D3 and D4, thereby balancing the two LED loads by the coupled inductor Lea.
  • the technical problem to be solved by the present invention is to provide a multi-channel constant current driving circuit, both of which The fluidity is good; moreover, the volume of the current sharing transformer can be reduced, and the cost can be reduced.
  • the invention provides a multi-channel constant current driving circuit, comprising: a DC/AC converter, a main transformer and at least two rectifying and filtering units;
  • the DC/AC converter supplies an AC voltage to the main transformer;
  • the main transformer includes at least one tapped secondary winding, and the tap divides the corresponding secondary winding into a first winding and a second winding, the difference of the first winding The name end and the second end of the second winding are connected;
  • each of the power supply circuits includes: a first rectifying circuit and a second rectifying circuit, wherein the first rectifying circuit and the second rectifying circuit are respectively used for Performing rectification of positive and negative half cycle AC voltages; the first winding and the second winding are respectively located in the first rectifying circuit and the second rectifying circuit;
  • a current sharing transformer is disposed between the first power supply circuit and the second power supply circuit where the adjacent rectifying and filtering unit is located, and the current sharing transformer includes four windings respectively located in the rectification included in the first power supply circuit and the second power supply circuit. In the loop, it is used to achieve current sharing between different rectification loops where adjacent rectification filtering units are located.
  • the rectifying and filtering unit includes a first diode, a second diode, and a first capacitor; and the power supply circuit includes: the first end of the first winding of the secondary winding is sequentially connected in series by the first The pole tube and the first capacitor are connected to the different end of the first winding, the anode of the first diode is connected to the same end of the first winding of the secondary winding; the same end of the second winding of the secondary winding is connected in series A capacitor and a second diode are coupled to the different end of the second winding, and an anode of the second diode is coupled to the different end of the second winding of the secondary winding.
  • the first winding of the current sharing transformer is connected in series between the same name end of the first winding of the secondary winding and the first capacitor;
  • the current sharing transformer is The second winding is serially connected between the different end of the second winding of the secondary winding and the first capacitor;
  • the third winding of the current sharing transformer is serially connected between the same end of the first winding of the secondary winding and the first capacitor; and the fourth winding string of the current sharing transformer Connected between the different end of the second winding of the secondary winding and the first capacitor.
  • the rectifying and filtering circuit includes: a third diode, a fourth diode, a first inductor, and a second capacitor;
  • the power supply circuit includes: a third end of the first winding of the secondary winding, a third diode sequentially connected in series, a first inductor and a second capacitor connected to the opposite end of the first winding, and an anode of the third diode Connecting the same end of the first winding of the secondary winding; the same end of the second winding of the secondary winding is connected to the different end of the second winding through the second capacitor, the first inductor and the fourth diode which are sequentially connected in series The anode of the fourth diode is connected to the opposite end of the second winding of the secondary winding.
  • the first winding of the current sharing transformer is serially connected between the same end of the first winding of the secondary winding and the first inductor;
  • the current sharing transformer is The second winding is serially connected between the different end of the second winding of the secondary winding and the first inductor;
  • the third winding of the current sharing transformer is serially connected between the same end of the first winding of the secondary winding and the first inductor; and the fourth winding string of the current sharing transformer Connected between the different end of the second winding of the secondary winding and the first inductor.
  • the main transformer includes a primary winding and a tapped secondary winding; and a tapped secondary winding forms a power supply loop with each of the rectifying and filtering units.
  • the main transformer includes a primary winding and at least two secondary windings with taps, each secondary winding corresponding to a rectifying and filtering unit;
  • Each of the secondary windings and the rectifying and filtering unit corresponding to the secondary winding form a power supply loop.
  • the main transformer includes at least two primary windings and at least two secondary windings with taps, a primary winding, a secondary winding, and a rectifying and filtering unit-corresponding;
  • Each of the secondary windings and the rectifying and filtering unit corresponding to the secondary winding form a power supply loop.
  • the DC/AC converter is any one of a bridge circuit, a push-pull circuit, a flyback circuit, a forward circuit, a series resonant circuit, a LLC type resonant circuit, or a soft switching circuit.
  • a multi-channel constant current driving circuit comprising: a DC/AC converter and a main transformer;
  • the DC/AC converter supplies an alternating voltage to the main transformer;
  • the main transformer includes at least one tapped secondary winding, the tap divides the corresponding secondary winding into a first winding and a second winding, and the different ends of the first winding are connected to the same end of the second winding;
  • Each stage of the power supply circuit of the secondary winding includes: a first rectifying circuit and a second rectifying circuit;
  • the first rectifying circuit includes: the first end of the first winding of the secondary winding is powered by a rectifying and filtering unit and a previous stage a third winding of all the current sharing transformers disposed in the loop, a first winding of the current sharing transformer corresponding to the power supply circuit of the current stage and the power supply circuit of the next stage is connected to the second end of the first winding of the secondary winding;
  • the rectifying circuit comprises: a first end of the second winding of the secondary winding through the second winding of the current sharing transformer corresponding to the next-stage power supply loop, and all the current sharing transformers provided in the previous power supply loop a fourth winding and a rectifying and filtering unit connected to the second end of the first winding of the secondary winding;
  • the current sharing transformer includes four windings for achieving current sharing between different rectification loops in which adjacent rectification filtering units are located.
  • the rectification filtering unit includes a first diode, a second diode, and a first capacitor.
  • the first rectifying circuit comprises: the first end of the first winding of the secondary winding sequentially passes through the third winding of all the current sharing transformers provided in the previous power supply circuits, the first diode, the current power supply circuit and the next a first winding of the current sharing transformer corresponding to the stage power supply circuit, and a first end of the first winding connecting the first winding of the secondary winding;
  • the second rectifying circuit includes: the first end of the second winding of the secondary winding sequentially passes through the second capacitor and the second diode of the current sharing transformer corresponding to the first capacitor, the current power supply loop and the next power supply loop And a fourth winding of all the current sharing transformers disposed in the previous power supply circuits is connected to the second end of the first winding of the secondary winding.
  • the first rectifying circuit comprises: the first end of the first winding of the secondary winding sequentially passes through the third winding of all the current sharing transformers provided in the previous power supply circuits, the power supply circuit of the current stage and the power supply circuit of the next stage a first winding of the common current sharing transformer, a first diode, and a first capacitor connected to the second end of the first winding of the secondary winding;
  • the second rectifying circuit comprises: the first end of the second winding of the secondary winding sequentially passes through the first capacitor, the second diode, the second winding of the current sharing transformer corresponding to the current supply circuit and the next-stage power supply circuit
  • the fourth winding of all the current sharing transformers disposed in the previous power supply circuits is connected to the second end of the first winding of the secondary winding.
  • the main transformer is:
  • a transformer comprising a primary winding and a secondary winding
  • a transformer comprising a primary winding and at least two secondary windings
  • a transformer comprising at least two primary windings and at least two secondary windings, and the primary winding and the secondary winding are in one-to-one correspondence.
  • the DC/AC converter is any one of a bridge circuit, a push-pull circuit, a flyback circuit, a forward circuit, a series resonant circuit, a LLC type resonant circuit, or a soft switching circuit.
  • a multi-channel constant current driving circuit comprising: a DC/AC converter and a main transformer; and a DC/AC converter provides an AC voltage to the main transformer;
  • the main transformer includes at least one tapped secondary winding, the tap divides the corresponding secondary winding into a first winding and a second winding, and the different ends of the first winding are connected to the same end of the second winding;
  • the secondary winding of the main transformer is connected to at least two power supply branch groups to form a main power supply circuit; a current sharing transformer is arranged between two adjacent main power supply circuits; the first winding and the second of the current sharing transformer
  • the winding is disposed in one main power supply circuit of the two main power supply circuits, and the third winding and the fourth winding are disposed in another main power supply circuit of the two main power supply circuits for performing two main power supply circuits The current flow between.
  • the at least one main power supply circuit of the two main power supply circuits includes: at least two power supply circuits, each of the first power supply circuits includes: a first rectification circuit and a second rectification circuit; and the first rectification circuit includes: corresponding to the secondary winding
  • the first end of the first winding is connected through the rectifying and filtering unit, the third winding of all the current sharing transformers provided in the previous power supply circuits, and the first winding of the current sharing circuit corresponding to the current supply circuit of the next stage a second end of the first winding of the secondary winding
  • the second rectifying circuit includes: a first end of the second winding of the secondary winding through a current sharing circuit and a current sharing circuit corresponding to the next primary power supply circuit
  • the second winding, all of the current sharing transformers provided in the previous stages of the power supply circuit a fourth winding and a rectifying and filtering unit are connected to the second end of the first winding of the secondary winding;
  • the current sharing transformer includes four windings
  • At least one of the two main power supply circuits includes: at least two power supply circuits, each power supply circuit consisting of a rectifying and filtering unit and a corresponding secondary winding of the main transformer, including a first rectifying circuit and a second rectifying circuit a first winding and a second winding corresponding to the secondary winding are respectively located in the first rectifying circuit and the second rectifying circuit, wherein the first rectifying circuit and the second rectifying circuit are respectively used for performing positive and negative half cycle AC voltage Rectifying; a current sharing transformer is disposed between the first power supply circuit and the second power supply circuit where the adjacent rectifying and filtering unit is located, and the current sharing transformer includes four windings, which are respectively included in the first power supply circuit and the second power supply circuit In the rectification loop, the current sharing between different rectification loops in which adjacent rectification filtering units are located is implemented.
  • the current sharing transformer Since the first winding and the second winding (or the third winding and the fourth winding) of the current sharing transformer respectively flow through two different rectifying circuits of the positive and negative half cycles of the alternating current power source, and opposite ends of the same name, equivalent to the current sharing transformer
  • the winding flows through the bidirectional AC current, so there is no DC component in the current sharing transformer. Therefore, the current sharing transformer does not need to open the air gap, and it is easy to obtain a large inductance in a small volume, and the current is high and the cost is low.
  • FIG. 1 is a schematic structural view of a prior art LED constant current control circuit
  • 3 to 3b are schematic diagrams showing the structure of a two-way constant current driving circuit according to the present invention.
  • FIG. 4 to FIG. 4b are schematic diagrams showing another structure of a two-way constant current driving circuit according to the present invention.
  • 5 to 5b are schematic diagrams showing the structure of a third two-way constant current driving circuit according to the present invention.
  • FIG. 6 and FIG. 6e are schematic diagrams showing the structure of a two-way constant current driving circuit under different DC/AC converters according to the present invention.
  • FIG. 7 to 7c are schematic structural views of a multi-channel constant current driving circuit according to the present invention.
  • FIG. 8a is a schematic structural view of a fourth multi-channel constant current driving circuit of the present invention.
  • FIG. 9 is a schematic view showing the structure of a fifth multi-channel constant current driving circuit of the present invention.
  • a multi-channel constant current driving circuit includes: a DC/AC converter, a main transformer, and at least two rectifying and filtering units;
  • the DC/AC converter supplies an AC voltage to the main transformer;
  • the main transformer includes at least one tapped secondary winding, and the tap divides the corresponding secondary winding into a first winding and a second winding, the difference of the first winding The name end and the second end of the second winding are connected;
  • each of the power supply circuits includes: a first rectifying circuit and a second rectifying circuit, wherein the first rectifying circuit and the second rectifying circuit are respectively used for Performing rectification of positive and negative half cycle AC voltages; the first winding and the second winding are respectively located in the first rectifying circuit and the second rectifying circuit;
  • a current sharing transformer is disposed between the first power supply circuit and the second power supply circuit where the adjacent rectifying and filtering unit is located, and the current sharing transformer includes four windings respectively located in the rectification included in the first power supply circuit and the second power supply circuit. In the loop, it is used to achieve current sharing between different rectification loops where adjacent rectification filtering units are located.
  • the same end of the first winding and the second winding flow opposite currents, and the same end of the first winding and the third winding flow through opposite currents, the third winding and the third The opposite end of the four windings flows through the opposite current.
  • the main transformer may be implemented as: comprising a primary winding and a secondary winding; or comprising a primary winding and at least two secondary windings; or comprising at least two primary windings and at least two secondary windings, etc. .
  • the implementation of the DC/AC converter may be any one of a bridge circuit, a push-pull circuit, a flyback circuit, a forward circuit, a series resonant circuit, a LLC-like resonant circuit, or a soft switching circuit.
  • the multi-channel constant current driving circuit includes: a DC/AC converter, a main transformer Ta3, and a first rectifying and filtering unit.
  • the main transformer Ta3 includes a primary winding and a secondary winding with a tap; the tap divides the secondary winding into a first winding Wa31 and a second winding Wa32, the different end of the first winding Wa31 and the The same name end of the two windings Wa32 is connected;
  • the secondary windings form a power supply circuit with the first rectifying and filtering unit Z31 and the second rectifying and filtering unit Z32. Specifically, the same end of the first winding Wa31 of the secondary winding is connected to the first input end of the first rectifying and filtering unit Z31. T1, the different end is connected to the second input terminal t2 of the first rectifying and filtering unit Z31, and the different end of the second winding Wa32 of the secondary winding is connected to the third input end of the first rectifying and filtering unit Z31.
  • the connection relationship between the second rectifying and filtering unit Z32 and the secondary winding is similar to that of the first rectifying and filtering unit Z31, and is not mentioned here.
  • the current sharing transformer T31 includes four windings, which are a first winding W311, a second winding W312, a third winding W313, and a fourth winding W314, respectively; the same-name end of the first winding W311 flows opposite to the same-name end of the second winding W312. Current, the same end of the third winding W313, the fourth winding W314 flows through the opposite current, and the same end of the first winding W311 and the same end of the third winding W313 flow opposite currents;
  • the first winding W311 and the second winding W312 are located in the power supply loop where the first rectifying and filtering unit Z31 is located, and the third winding W313 and the fourth winding W314 are located in the power supply loop where the second rectifying and filtering unit Z32 is located.
  • the first winding W311 is serially connected between the same end of the first winding Wa31 of the secondary winding of the main transformer Ta3 and the first input end t1 of the first rectifying and filtering unit Z31
  • the second winding W312 is serially connected to the main transformer.
  • the opposite end of the second winding Wa32 of the secondary winding of Ta3 is between the third input terminal t3 of the first rectifying and filtering unit Z31; the third winding W313 is serially connected to the first winding Wa31 of the secondary winding of the main transformer Ta3.
  • the fourth winding W314 is connected in series between the different end of the second winding Wa32 of the secondary winding of the main transformer Ta3 and the second rectifying and filtering unit Z32.
  • the power supply circuit needs to include two rectifying circuits for rectifying the positive and negative half-cycle AC voltages, for example,
  • the rectifying and filtering unit may include: a first diode D1, a second diode D2, and a first capacitor C1;
  • Each power supply circuit includes: a first end of the first winding Wa31 of the secondary winding, a first terminal D1 connected in series, and a first capacitor C1 connected to the different end of the first winding Wa31, the first diode
  • the anode of D1 is connected to the same end of the first winding Wa31 of the secondary winding; the same end of the second winding Wa32 of the secondary winding is connected to the second winding Wa32 by the first capacitor C1 and the second diode D2 which are sequentially connected in series
  • the end of the second diode D2 is connected to the opposite end of the second winding Wa32 of the secondary winding.
  • the first winding of the secondary winding forms a first rectifying circuit between the first diode D1 and the first capacitor C1; and the second winding of the secondary winding and the second diode and the first capacitor C1 A second rectification loop is formed between them.
  • An alternating current source of positive and negative half cycles flows through the two rectifier circuits.
  • the first winding W311 of the current sharing transformer T31 is located in the first rectifying circuit corresponding to the first rectifying and filtering unit Z31
  • the second winding W312 is located in the second rectifying circuit corresponding to the first rectifying and filtering unit Z31
  • the third winding W313 is located.
  • the fourth winding W314 is located in the second rectifying circuit corresponding to the second rectifying and filtering unit Z32.
  • the rectifying and filtering unit may include: a third diode D3, a fourth diode D4, a first inductor L1, and a second capacitor C2;
  • Each power supply circuit includes: a front end of the first winding W311 of the secondary winding is connected to the different end of the first winding W311 through a third diode D3, a first inductor L1 and a second capacitor C2 connected in series, third The anode of the diode D3 is connected to the same end of the first winding W311 of the secondary winding; the same end of the second winding W312 of the secondary winding passes through the second capacitor C2, the first inductor L1 and the fourth diode which are sequentially connected in series D4 is connected to the different end of the second winding W312, and the anode of the fourth diode D4 is connected to the different end of the second winding W312 of the secondary winding.
  • a first rectifying loop is formed between C2; and a second rectifying loop is formed between the second winding of the secondary winding and the fourth diode D4, the first inductor L1, and the second capacitor C2.
  • An alternating current source of positive and negative half cycles flows through the two rectification loops.
  • the first winding W311 of the current sharing transformer T31 is located in the first rectifying circuit corresponding to the first rectifying and filtering unit Z31
  • the second winding W312 is located in the second rectifying circuit corresponding to the first rectifying and filtering unit Z31
  • the third winding W313 is located.
  • the fourth winding W314 is located in the second rectifying circuit corresponding to the second rectifying and filtering unit Z32.
  • the working principle of the current sharing transformer T31 is: the output current of the transformer iw311, iw312 flows through the two windings W311 and W312 of the current sharing transformer in the positive and negative half cycles of the alternating current voltage, respectively.
  • W311 W312
  • output current iw313, iw314 respectively flow in the positive and negative half of the alternating current voltage through the different ends of the two windings W313 and W314 of the current sharing transformer and the same name end
  • the voltage at both ends of A2 is unbalanced, and the excitation current of the current sharing transformer is not zero.
  • the AC voltage generated by the excitation current at both ends of the current sharing transformer will automatically balance the voltage difference of each load, so that the current of the current sharing transformer iw311 (iw312)
  • the ratio to iw313 (iw314) is m:n, which enables control of multiple load currents.
  • the current sharing transformer actually only equalizes the AC current component of the load current and does not contribute to the DC component. The larger the inductance of the current sharing transformer, the better the current sharing between the two loads.
  • the first winding and the second winding (or the third winding and the fourth winding) of the current sharing transformer respectively flow through the alternating current power supply.
  • Two different rectification circuits in the negative half cycle, and opposite to the same name end, are equivalent to the bidirectional AC current flowing through the winding of the current sharing transformer, so there is no DC component in the current sharing transformer, so the current sharing transformer does not need to open the air gap. It is easy to obtain a large inductance in a small volume, the current is very high, and the cost is low.
  • the circuit is used for the AC square wave duty cycle approaching 50%, there is almost no efficiency loss; when multiple outputs When the voltage difference is large (or even short-circuited), the additional stress and spike of the rectifier are not increased, which can improve device reliability and reduce device cost, and is beneficial to electromagnetic interference (EMI).
  • EMI electromagnetic interference
  • the structure of the main transformer is: including a primary winding and a secondary winding, and the secondary winding and each rectifying and filtering unit form a power supply loop;
  • the structure of the main transformer may also be: including a primary winding and at least two secondary windings. At this time, each secondary winding corresponds to a rectifying and filtering unit, thereby respectively forming a power supply loop.
  • FIG. 3 The circuit structure is changed to the circuit structure shown in FIG. 4, and the difference between FIG. 4 and FIG. 3 is only The structure of the main transformer is different, which in turn leads to a slightly different supply circuit. The same, figure
  • FIG. 4a and FIG. 4b show the implementation structure of the multi-channel constant current driving circuit of the present invention under different rectifying and filtering units, and FIG. 4a and FIG. 4b respectively correspond to FIG. 3a and FIG. 3b, the difference is only the difference of the main transformer structure, and details are not described herein again. .
  • the main transformer may further include: at least two primary windings and at least two secondary windings, a primary winding, a secondary winding, and Corresponding between the rectifying and filtering units.
  • each secondary winding corresponds to a rectifying and filtering unit, thereby respectively forming a power supply circuit.
  • the circuit structure of FIG. 3 is changed to the circuit structure shown in FIG. 5, and FIG. 5 and FIG. 3 differ only in the main transformer. The structure is different, which in turn leads to a slightly different supply loop.
  • FIG. 5a and FIG. 5b correspond to FIG. 3a and FIG. 3b, respectively, except that the main transformer structure is different. I won't go into details here.
  • the implementation of the DC/AC converter is not limited in the present invention, and may be any one of a bridge circuit, a push-pull circuit, a flyback circuit, a forward circuit, a series resonant circuit, a LLC resonant circuit, or a soft switching circuit.
  • a bridge circuit a push-pull circuit
  • a flyback circuit a forward circuit
  • a series resonant circuit a LLC resonant circuit
  • a soft switching circuit a soft switching circuit.
  • the implementation of the DC/AC converter is an LLC resonant circuit, a symmetric half bridge circuit, an asymmetric half bridge circuit, and a full bridge circuit, respectively.
  • push-pull circuits are examples of push-pull circuits.
  • the multi-channel constant current driving circuit shown above is two channels. In practical applications, it can also be extended to more than two channels. At this time, as shown in Figures 7a to 7c, respectively, corresponding to Figure 3a, Figure 4a and Figure 5a.
  • the present invention further provides another multi-channel constant current driving circuit, which includes: a DC/AC converter and a main transformer;
  • the DC/AC converter supplies an alternating voltage to the main transformer
  • the main transformer includes at least one tapped secondary winding, the tap divides the corresponding secondary winding into a first winding and a second winding, and the different ends of the first winding are connected to the same end of the second winding;
  • Each stage of the power supply circuit of each side winding includes: a first rectifying circuit and a second rectifying circuit;
  • the first rectifying circuit includes: the first end of the first winding of the secondary winding is powered by the rectifying and filtering unit and the previous stage The third winding of all current sharing transformers set in the loop, the power supply circuit of the current stage and the power supply of the next stage a first winding of the current sharing transformer corresponding to the circuit is connected to the second end of the first winding of the secondary winding;
  • the second rectifying circuit comprises: the first end of the second winding of the secondary winding passes through the power supply loop of the current stage a second winding of the current sharing transformer corresponding to the next-stage power supply circuit, a fourth winding of all the current sharing transformers provided in the previous power supply circuits, and a second end of the first winding of the rectifying and filtering unit connected to the secondary winding ;
  • the current sharing transformer includes four windings for achieving current sharing between different rectification loops in which adjacent rectification filtering units are located.
  • the rectifying and filtering unit may include a first diode D1, a second diode D2, and a first capacitor Cl.
  • the secondary windings of the secondary windings correspond to the multi-stage power supply circuit, and each of the power supply circuits includes a first rectifying circuit and a second rectifying circuit, where
  • the first rectifying circuit includes: the first end of the first winding of the secondary winding sequentially passes through the first diode D1, the third winding of all the current sharing transformers provided in the previous power supply circuits, and the present a first winding of the current sharing transformer corresponding to the power supply circuit and a power supply circuit of the next stage, and a first capacitor C1 connecting the second end of the first winding of the secondary winding;
  • the second rectifying circuit includes: the first end of the second winding of the secondary winding sequentially passes through the first capacitor
  • the second winding of the current sharing transformer corresponding to the power supply circuit of the current stage and the power supply circuit of the next stage, the fourth winding of all the current sharing transformers provided in the previous power supply circuits, and the second diode D2 are connected a second end of the first winding of the secondary winding.
  • the first rectifying circuit may include: the first end of the first winding of the secondary winding sequentially passes through the third winding of all the current sharing transformers disposed in the previous power supply circuits, and the current stage a first winding of the current sharing circuit corresponding to the power supply circuit and the first power supply circuit, a first diode, and a first capacitor connected to the second end of the first winding of the secondary winding;
  • the second rectifying circuit may include: the first end of the second winding of the secondary winding sequentially passes through the first capacitor, the second diode, and the current sharing circuit of the current-stage power supply circuit and the next-stage power supply circuit
  • the second winding of the second winding, the fourth winding of all the current sharing transformers provided in the previous stages of the power supply circuit is connected to the second end of the first winding of the secondary winding.
  • the N-1th current sharing transformer realizes the current sharing of the total N-2 load current and the last load current, thereby achieving current sharing between the N load currents.
  • the first rectification circuit includes: the first end of the first winding of the secondary winding passes through the first diode D1 and the current sharing transformer D1. a third winding of the current sharing transformer T8 (N-2), a first winding of the current sharing transformer T8 (N-1), and a first capacitor C1 connecting the second end of the first winding of the secondary winding;
  • the second rectifying circuit comprises: the first end of the second winding of the secondary winding sequentially passes through the first capacitor C1, the second winding of the current sharing transformer T8 (N-1), and the current sharing transformer T8 (N-2) Flow transformer
  • a fourth winding of T81 and a second diode D2 are coupled to the second end of the first winding of the secondary winding.
  • the first rectification circuit includes: the first end of the first winding of the secondary winding sequentially passes through the first diode D1, the current sharing transformer D1, the current sharing transformer T8 (N-1) a third winding, and a first capacitor C1 connecting the second end of the first winding of the secondary winding;
  • the second rectifying circuit includes: the first end of the second winding of the secondary winding sequentially passes through the first capacitor
  • D2 connects the second end of the first winding of the secondary winding.
  • the Nth stage power supply loop does not have the latter stage power supply loop, the first winding and the second winding of the current sharing transformer are not included in the Nth stage power supply loop.
  • the main transformer is a transformer including a primary winding and a secondary winding; in practical applications, the primary transformer may further include: a primary winding and at least two secondary windings The transformer; or, includes at least two primary windings and at least two secondary windings, and a primary winding and a secondary winding - a corresponding transformer or the like.
  • each secondary winding of the main transformer can correspond to a multi-stage supply loop similar to that shown in Figure 8a.
  • each of the secondary windings may correspond to the at least two-stage power supply circuit; or, for each secondary winding It is also possible to correspond to a plurality of the at least two-stage power supply circuits, and the multi-channel constant current drive circuit of the present invention can also be implemented.
  • each of the secondary windings of each of the secondary windings may correspond to at least two power supply circuits, and the secondary windings of other portions may be used in the prior art.
  • the circuit structure forms a power supply circuit to supply power to the load, and current sharing is performed.
  • various power supply circuits in the present invention such as FIG. 3 to FIG. 7c can be used to supply power to the load, and current sharing is performed, which is not limited herein.
  • circuit structure shown in FIG. 8a and FIG. 7a can be combined in the same multi-channel constant current driving circuit.
  • all the paths connected to the secondary windings and connected to each other in parallel to form a constant current driving circuit may be referred to as a first power supply branch.
  • all the power supply branches constituting the multi-stage constant current driving circuit connected to the secondary windings may be referred to as a second power supply branch group;
  • the main transformer includes a primary winding and a secondary winding, and then the input ends of the first power supply branch group and the second power supply branch group are respectively connected to the secondary winding of the main transformer The two ends are connected, that is, the first power supply branch group and the second power supply branch group are connected in parallel to the same secondary winding, and the power supply circuit formed by connecting the first power supply branch group and the secondary winding is referred to as a first main power supply.
  • the circuit, the power supply circuit formed by connecting the second power supply branch group and the secondary side winding is referred to as a second main power supply circuit; at this time, in order to realize the total current I of the first main power supply circuit and the total current In of the second main power supply circuit
  • the current sharing between the two main power supply circuits may be further provided with a current sharing transformer T90, wherein the first winding and the second winding are respectively disposed in the first main power supply circuit, the secondary winding and the first power supply branch Between the input terminals of the group; the third winding and the fourth winding are respectively disposed between the secondary winding of the second main power supply circuit and the input end of the second power supply branch group.
  • the circuit can also be extended to various situations in which the multi-channel constant current driving circuit of the present invention includes at least one first power supply branch group and at least one second power supply branch group, or can be extended to The invention of the multi-channel constant current driving circuit includes at least two first power supply branch groups or at least two second power supply branch groups.
  • the circuit shown in Figure 9a can be extended to include a primary winding and a plurality of secondary windings, or a plurality of primary windings and a plurality of secondary windings. , as shown in Figures 9d ⁇ 9e. I won't go into details here.
  • the DC/AC converter in this embodiment may also be any one of a bridge circuit, a push-pull circuit, a flyback circuit, a forward circuit, a series resonant circuit, a LLC resonant circuit, or a soft switching circuit.
  • a bridge circuit a push-pull circuit
  • a flyback circuit a forward circuit
  • a series resonant circuit a LLC resonant circuit
  • a soft switching circuit for details, see Figures 6a ⁇ ® 6e, which are not described here.

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Description

多路恒流驱动电路
本申请要求于 2009 年 11 月 21 日提交中国专利局、 申请号为 200910225966.4、发明名称为"一种适用于多路 LED恒流驱动的电路"的中国专 利申请的优先权， 其全部内容通过引用结合在本申请中；
本申请要求于 2009 年 11 月 21 日提交中国专利局、 申请号为
200920273352.9、发明名称为"一种适用于多路 LED恒流驱动的电路"的中国专 利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及恒流驱动技术领域， 尤其涉及多路恒流驱动电路。
背景技术
目前， 对于多路发光二极管 （LED )驱动的 LED恒流控制， 最常用的方 案是恒压模块 +多路非隔离 DC/DC恒流模块。
如图 1所示为现有技术中多路 LED驱动的 LED恒流控制电路。在该电路 中， 输入电压 Vac经过恒压模块后作为多路非隔离 DC/DC恒流模块的输入， 每路非隔离 DC/DC恒流模块单独做恒流控制。 但是， 由于恒压模块的电压和 LED的电压一般有较大的压差， 因此， 后级多路非隔离 DC/DC恒流模块的效 率都不会太高， 并且多路非隔离 DC/DC恒流模块结构复杂， 成本较高。
申请号为 200810085227.5的中国专利中， 提供了一种多组发光二极管电 流平衡供电电路， 如图 2所示， 耦合电感 Lea的第一电感 Leal串联在二极管 D1和 D2整流后的直流回路中， 耦合电感 Lea的第二电感 Lca2串联在二极管 D3和 D4整流后的直流回路中， 从而通过耦合电感 Lea起到均衡两路 LED负 载的作用。 但是， 对于图 2所示的电路， 由于耦合电感 Lea的两个线圈串联在 直流回路中， 有直流分量， 而耦合电感中激磁电流是单向的， 因此， 当两路负 载支路的电压不平衡时， 两路负载支路的电流误差较大， 均流度差； 而且， 耦 合电感存在直流分量时， 会造成磁芯饱和， 需要开气隙， 因此电感量大时， 耦 合电感体积大且成本高。
发明内容
有鉴于此， 本发明要解决的技术问题是， 提供一种多路恒流驱动电路， 均 流度好； 而且， 能够减小均流变压器的体积， 降低成本。
为此， 本发明实施例采用如下技术方案：
本发明提供一种多路恒流驱动电路， 包括： DC/AC变换器、 主变压器以 及至少两个整流滤波单元；
DC/AC变换器为主变压器提供交流电压； 所述主变压器包括至少一个带 抽头的副边绕组，所述抽头将对应的副边绕组分为第一绕组和第二绕组， 第一 绕组的异名端和第二绕组的同名端相连接；
所述至少两个整流滤波单元分别与主变压器的副边绕组形成供电回路；每 一供电回路包括： 第一整流回路和第二整流回路， 所述第一整流回路和第二整 流回路分别用于进行正负半周交流电压的整流；所述第一绕组和第二绕组分别 位于所述第一整流回路和第二整流回路；
相邻的整流滤波单元所在的第一供电回路和第二供电回路之间设置一个 均流变压器， 所述均流变压器包括四个绕组， 分别位于第一供电回路和第二供 电回路所包含的整流回路中，用于实现相邻的整流滤波单元所在的不同整流回 路之间的均流。
所述均流变压器的四个绕组中，第一绕组和第二绕组的同名端流过相反的 电流， 第一绕组和第三绕组的同名端流过相反的电流， 第三绕组和第四绕组的 同名端流过相反的电流。
所述整流滤波单元包括第一二极管、 第二二极管以及第一电容； 贝' J , 所述供电回路包括：副边绕组的第一绕组的同名端通过依次串接的第一二 极管以及第一电容连接第一绕组的异名端，第一二极管的阳极连接副边绕组的 第一绕组的同名端；副边绕组的第二绕组的同名端通过依次串接的第一电容和 第二二极管连接第二绕组的异名端，所述第二二极管的阳极连接副边绕组的第 二绕组的异名端。
其特征在于： 第一整流滤波单元所在的供电回路中， 所述均流变压器的第 一绕组串接于副边绕组的第一绕组的同名端与第一电容之间；所述均流变压器 的第二绕组串接于副边绕组的第二绕组的异名端与第一电容之间； 第二整流滤波单元所在的供电回路中，所述均流变压器的第三绕组串接于 副边绕组的第一绕组的同名端与第一电容之间；所述均流变压器的第四绕组串 接于副边绕组的第二绕组的异名端与第一电容之间。
所述整流滤波电路包括： 第三二极管、 第四二极管、 第一电感以及第二电 容； 则，
所述供电回路包括：副边绕组的第一绕组的同名端通过依次串接的第三二 极管、第一电感以及第二电容连接第一绕组的异名端， 第三二极管的阳极连接 副边绕组的第一绕组的同名端；副边绕组的第二绕组的同名端通过依次串接的 第二电容、第一电感以及第四二极管连接第二绕组的异名端， 所述第四二极管 的阳极连接副边绕组的第二绕组的异名端。
其特征在于， 第一整流滤波单元所在的供电回路中， 所述均流变压器的第 一绕组串接于副边绕组的第一绕组的同名端与第一电感之间；所述均流变压器 的第二绕组串接于副边绕组的第二绕组的异名端与第一电感之间；
第二整流滤波单元所在的供电回路中，所述均流变压器的第三绕组串接于 副边绕组的第一绕组的同名端与第一电感之间；所述均流变压器的第四绕组串 接于副边绕组的第二绕组的异名端与第一电感之间。
所述主变压器包括一个原边绕组和一个带抽头的副边绕组； 贝 ij , 该带抽头的副边绕组分别与每个所述整流滤波单元形成供电回路。
所述主变压器包括一个原边绕组和至少两个带抽头的副边绕组，每一副边 绕组对应一整流滤波单元； 贝' J ,
每一副边绕组与该副边绕组对应的整流滤波单元形成供电回路。
所述主变压器包括至少两个原边绕组和至少两个带抽头的副边绕组，原边 绕组、 副边绕组以及整流滤波单元——对应； 贝 ij ,
每一副边绕组与该副边绕组对应的整流滤波单元形成供电回路。
所述 DC/AC变换器为桥式电路、 推挽电路、 反激电路、 正激电路、 串联 谐振电路、 LLC类谐振电路或者软开关电路其中的任何一种电路结构。
还提供一种多路恒流驱动电路， 包括： DC/AC变换器、 主变压器；
DC/AC变换器为主变压器提供交流电压； 所述主变压器包括至少一个带抽头的副边绕组，所述抽头将对应的副边绕 组分为第一绕组和第二绕组， 第一绕组的异名端和第二绕组的同名端相连接； 所述主变压器的副边绕组中存在至少一个副边绕组，所述至少一个副边绕组中 的每一个副边绕组对应至少两级供电回路；
所述副边绕组的每一级供电回路包括： 第一整流回路和第二整流回路； 第 一整流回路包括： 该副边绕组的第一绕组的第一端通过整流滤波单元、之前各 级供电回路中设置的所有均流变压器的第三绕组、本级供电回路与下一级供电 回路共同对应的均流变压器的第一绕组连接所述副边绕组的第一绕组的第二 端； 第二整流回路包括： 该副边绕组的第二绕组的第一端通过本级供电回路与 下一级供电回路共同对应的均流变压器的第二绕组、之前各级供电回路中设置 的所有均流变压器的第四绕组以及整流滤波单元连接所述副边绕组的第一绕 组的第二端；
所述均流变压器包括四个绕组，用于实现相邻的整流滤波单元所在的不同 整流回路之间的均流。
所述均流变压器的四个绕组中，第一绕组和第二绕组的同名端流过相反的 电流， 第一绕组和第三绕组的同名端流过相反的电流， 第三绕组和第四绕组的 同名端流过相反的电流。
所述整流滤波单元包括第一二极管、 第二二极管以及第一电容。
第一整流回路包括：该副边绕组的第一绕组的第一端依次通过之前各级供 电回路中设置的所有均流变压器的第三绕组、第一二极管、本级供电回路与下 一级供电回路共同对应的均流变压器的第一绕组、以及第一电容连接所述副边 绕组的第一绕组的第二端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容、 本级供电回路与下一级供电回路共同对应的均流变压器的第二绕组、第二二极 管、以及之前各级供电回路中设置的所有均流变压器的第四绕组连接所述副边 绕组的第一绕组的第二端。
第一整流回路包括：该副边绕组的第一绕组的第一端依次通过之前各级供 电回路中设置的所有均流变压器的第三绕组、本级供电回路与下一级供电回路 共同对应的均流变压器的第一绕组、第一二极管以及第一电容连接所述副边绕 组的第一绕组的第二端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容、 第二二极管、本级供电回路与下一级供电回路共同对应的均流变压器的第二绕 组、之前各级供电回路中设置的所有均流变压器的第四绕组连接所述副边绕组 的第一绕组的第二端。
所述主变压器为：
包括一个原边绕组和一个副边绕组的变压器； 或者，
包括一个原边绕组和至少两个副边绕组的变压器； 或者，
包括至少两个原边绕组和至少两个副边绕组，且，原边绕组和副边绕组一 一对应的变压器。
所述 DC/AC变换器为桥式电路、 推挽电路、 反激电路、 正激电路、 串联 谐振电路、 LLC类谐振电路或者软开关电路其中的任何一种电路结构。
还提供一种多路恒流驱动电路， 包括： DC/AC变换器、 主变压器； DC/AC变换器为主变压器提供交流电压；
所述主变压器包括至少一个带抽头的副边绕组，所述抽头将对应的副边绕 组分为第一绕组和第二绕组， 第一绕组的异名端和第二绕组的同名端相连接； 所示主变压器的副边绕组与至少两个供电支路组连接， 分别构成主供电回路； 相邻的两个主供电回路之间设置一个均流变压器；均流变压器的第一绕组 和第二绕组设置于所述两个主供电回路的一个主供电回路中，而第三绕组和第 四绕组设置于所述两个主供电回路的另一个主供电回路中，用于进行两个主供 电回路之间的均流。
所述两个主供电回路中的至少一个主供电回路包括： 至少两级供电回路， 每一级供电回路包括： 第一整流回路和第二整流回路； 第一整流回路包括： 对 应副边绕组的第一绕组的第一端通过整流滤波单元、之前各级供电回路中设置 的所有均流变压器的第三绕组、本级供电回路与下一级供电回路共同对应的均 流变压器的第一绕组连接所述副边绕组的第一绕组的第二端；第二整流回路包 括：该副边绕组的第二绕组的第一端通过本级供电回路与下一级供电回路共同 对应的均流变压器的第二绕组、之前各级供电回路中设置的所有均流变压器的 第四绕组以及整流滤波单元连接所述副边绕组的第一绕组的第二端；所述均流 变压器包括四个绕组，用于实现相邻的整流滤波单元所在的不同整流回路之间 的均流。
所述两个主供电回路中的至少一个主供电回路包括： 至少两个供电回路， 每一供电回路由一整流滤波单元与主变压器的对应副边绕组构成，包括第一整 流回路和第二整流回路，对应副边绕组的第一绕组和第二绕组分别位于所述第 一整流回路和第二整流回路中 ,所述第一整流回路和第二整流回路分别用于进 行正负半周交流电压的整流；相邻的整流滤波单元所在的第一供电回路和第二 供电回路之间设置一个均流变压器， 所述均流变压器包括四个绕组， 分别位于 第一供电回路和第二供电回路所包含的整流回路中，用于实现相邻的整流滤波 单元所在的不同整流回路之间的均流。
对于上述技术方案的技术效果分析如下：
由于均流变压器第一绕组和第二绕组（或者第三绕组和第四绕组）分别流 过交流电源的正负半周的两个不同的整流回路，且同名端相反， 等效于均流变 压器的绕组流过双向的交流电流， 因此均流变压器中没有直流分量， 因此均流 变压器不需要开气隙， 在较小的体积下很容易获得较大的电感量， 均流度高， 成本低。
附图说明
图 1为现有技术 LED恒流控制电路结构示意图；
图 2为现有技术一种多组发光二极管电流平衡供电电路；
图 3~图 3b为本发明一种两路恒流驱动电路结构示意图；
图 4~图 4b为本发明另一种两路恒流驱动电路结构示意图；
图 5~图 5b为本发明第三种两路恒流驱动电路结构示意图；
图 6&~图 6e为本发明不同 DC/AC变换器下的两路恒流驱动电路结构示意 图；
图 7 ~图 7c为本发明多路恒流驱动电路结构示意图；
图 8a为本发明第四种多路恒流驱动电路结构示意图；
图 9&~图 9e为本发明第五种多路恒流驱动电路结构示意图。
具体实施方式 本发明实施例提供的一种多路恒流驱动电路中， 包括： DC/AC变换器、 主变压器以及至少两个整流滤波单元；
DC/AC变换器为主变压器提供交流电压； 所述主变压器包括至少一个带 抽头的副边绕组，所述抽头将对应的副边绕组分为第一绕组和第二绕组， 第一 绕组的异名端和第二绕组的同名端相连接；
所述至少两个整流滤波单元分别与主变压器的副边绕组形成供电回路；每 一供电回路包括： 第一整流回路和第二整流回路， 所述第一整流回路和第二整 流回路分别用于进行正负半周交流电压的整流；所述第一绕组和第二绕组分别 位于所述第一整流回路和第二整流回路；
相邻的整流滤波单元所在的第一供电回路和第二供电回路之间设置一个 均流变压器， 所述均流变压器包括四个绕组， 分别位于第一供电回路和第二供 电回路所包含的整流回路中，用于实现相邻的整流滤波单元所在的不同整流回 路之间的均流。
其中， 所述均流变压器的四个绕组中， 第一绕组和第二绕组的同名端流过 相反的电流， 第一绕组和第三绕组的同名端流过相反的电流， 第三绕组和第四 绕组的同名端流过相反的电流。
主变压器的实现可以为： 包括一个原边绕组和一个副边绕组； 或者， 包括 一个原边绕组和至少两个副边绕组； 或者， 包括至少两个原边绕组和至少两个 副边绕组等。
所述 DC/AC变换器的实现可以为桥式电路、 推挽电路、 反激电路、 正激 电路、 串联谐振电路、 LLC类谐振电路或者软开关电路其中的任何一种电路 结构。
以下， 结合附图详细说明本发明实施例多路恒流驱动电路的实现。
图 3为本发明实施例一种多路恒流驱动电路结构示意图，如图 3所示， 该 多路恒流驱动电路包括： DC/AC变换器、 主变压器 Ta3、 第一整流滤波单元
Z31以及第二整流滤波单元 Z32,所述第一整流滤波单元 Z31和第二整流滤波 单元 Z32输出的电能用于为 LED负载等负载供电； 其中， 主变压器 Ta3包括一个原边绕组和一个带抽头的副边绕组； 所述抽 头将所述副边绕组分为第一绕组 Wa31和第二绕组 Wa32, 第一绕组 Wa31的 异名端和第二绕组 Wa32的同名端相连接；
所述副边绕组分别与第一整流滤波单元 Z31和第二整流滤波单元 Z32形 成供电回路， 具体的， 副边绕组的第一绕组 Wa31的同名端连接第一整流滤波 单元 Z31的第一输入端 tl , 异名端连接第一整流滤波单元 Z31的第二输入端 t2, 副边绕组的第二绕组 Wa32的异名端连接第一整流滤波单元 Z31的第三输 入端。 第二整流滤波单元 Z32与该副边绕组的连接关系与第一整流滤波单元 Z31相似， 这里不赞述。
均流变压器 T31包括四个绕组， 分别为第一绕组 W311、 第二绕组 W312、 第三绕组 W313、第四绕组 W314; 第一绕组 W311的同名端与第二绕组 W312 的同名端流过相反的电流， 第三绕组 W313、 第四绕组 W314的同名端流过相 反的电流，第一绕组 W311的同名端与第三绕组 W313的同名端流过相反的电 流； 其中，
第一绕组 W311和第二绕组 W312位于第一整流滤波单元 Z31所在的供电 回路中， 第三绕组 W313、 第四绕组 W314位于第二整流滤波单元 Z32所在的 供电回路中。 具体的， 第一绕组 W311串接于主变压器 Ta3的副边绕组的第一 绕组 Wa31的同名端与第一整流滤波单元 Z31的第一输入端 tl之间， 第二绕 组 W312串接于主变压器 Ta3的副边绕组的第二绕组 Wa32的异名端与第一整 流滤波单元 Z31的第三输入端 t3之间； 第三绕组 W313串接于主变压器 Ta3 的副边绕组的第一绕组 Wa31的同名端与第二整流滤波单元 Z32的第一输入端 tl之间， 第四绕组 W314串接于主变压器 Ta3的副边绕组的第二绕组 Wa32的 异名端与第二整流滤波单元 Z32的第三输入端 t3之间。
其中，每一整流滤波单元与副边绕组形成的供电回路中， 需要包括两个整 流回路， 分别进行正负半周交流电压的整流， 例如，
如图 3a所示， 所述整流滤波单元的结构可以包括： 第一二极管 Dl、 第二 二极管 D2以及第一电容 C1; 其中，
每一供电回路包括： 副边绕组的第一绕组 Wa31的同名端通过依次串接的 第一二极管 D1以及第一电容 C1连接第一绕组 Wa31的异名端， 第一二极管 Dl的阳极连接副边绕组的第一绕组 Wa31的同名端； 副边绕组的第二绕组 Wa32的同名端通过依次串接的第一电容 C1和第二二极管 D2连接第二绕组 Wa32的异名端， 所述第二二极管 D2的阳极连接副边绕组的第二绕组 Wa32 的异名端。
其中， 副边绕组的第一绕组与第一二极管 Dl、 第一电容 C1之间形成了 第一整流回路； 而副边绕组的第二绕组与第二二极管、 第一电容 C1之间形成 了第二整流回路。 两个整流回路中分别流过正负半周的交流电源。
进而， 均流变压器 T31的第一绕组 W311位于第一整流滤波单元 Z31对 应的第一整流回路中，第二绕组 W312位于第一整流滤波单元 Z31对应的第二 整流回路中，第三绕组 W313位于第二整流滤波单元 Z32对应的第一整流回路 中， 第四绕组 W314位于第二整流滤波单元 Z32对应的第二整流回路中。
或者，如图 3b所示，所述整流滤波单元的结构可以包括： 第三二极管 D3、 第四二极管 D4、 第一电感 L1以及第二电容 C2; 其中，
每一供电回路包括： 副边绕组的第一绕组 W311的同名端通过依次串接的 第三二极管 D3、第一电感 L1以及第二电容 C2连接第一绕组 W311的异名端， 第三二极管 D3的阳极连接副边绕组的第一绕组 W311的同名端； 副边绕组的 第二绕组 W312的同名端通过依次串接的第二电容 C2、第一电感 L1以及第四 二极管 D4连接第二绕组 W312的异名端， 所述第四二极管 D4的阳极连接副 边绕组的第二绕组 W312的异名端。
此时， 副边绕组的第一绕组与第三二极管 D3、 第一电感 Ll、 第二电容
C2之间形成了第一整流回路； 而副边绕组的第二绕组与第四二极管 D4、 第一 电感 L1以及第二电容 C2之间形成了第二整流回路。 两个整流回路中分别流 过正负半周的交流电源。
进而， 均流变压器 T31的第一绕组 W311位于第一整流滤波单元 Z31对 应的第一整流回路中，第二绕组 W312位于第一整流滤波单元 Z31对应的第二 整流回路中，第三绕组 W313位于第二整流滤波单元 Z32对应的第一整流回路 中， 第四绕组 W314位于第二整流滤波单元 Z32对应的第二整流回路中。
具体的， 所述均流变压器 T31的工作原理为： 变压器的输出电流 iw311 , iw312分别在交流电压的正负半周流过均流变压器的两个绕组 W311和 W312 的同名端和异名端， W311=W312; 输出电流 iw313, iw314分别在交流电压的 正负半周流过均流变压器的两个绕组 W313和 W314的异名端和同名端，
W313=W314;
均流变压器匝比为 W311:W313=1:1时，如果由于两路 LED负载 A1和 A2 两端的电压不平衡， 造成负载电流 II和 12不平衡， 流过均流变压器 T31同名 端和异名端的电流不相等， 则均流变压器的激磁电流不为零， 激磁电流在均流 变压器的绕组两端产生的交流电压将自动平衡两路 LED负载的压差， 使均流 变压器中的电流 iw311 , iwl2和 iw313, iw314平衡， 从而实现负载电流（II 和 12 ) 的均衡。
当均流变压器的匝比 W311:W313=n:m时，如果由于两路 LED负载 A1和
A2两端的电压不平衡， 均流变压器的激磁电流不为零， 激磁电流在均流变压 器两端产生的交流电压将自动平衡各路负载的压差， 使均流变压器两路电流 iw311 ( iw312 )和 iw313 ( iw314 )之比为 m:n, 从而实现对多路负载电流的控 制。
均流变压器实际上只对负载电流的交流电流分量起均衡作用，对直流分量 不起作用。 均流变压器的电感量越大， 两路负载间的均流度越好。
基于以上的分析可知， 图 3~图 3b所示的多路恒流驱动电路中， 由于均流 变压器第一绕组和第二绕组（或者第三绕组和第四绕组）分别流过交流电源的 正负半周的两个不同的整流回路，且同名端相反， 等效于均流变压器的绕组流 过双向的交流电流， 因此均流变压器中没有直流分量， 因此均流变压器不需要 开气隙， 在较小的体积下很容易获得较大的电感量， 均流度非常高， 成本低； 而且， 该电路用于交流方波占空比接近 50%的场合， 几乎没有效率损失； 当多 路输出间压差很大（甚至短路） 时， 也没有增加整流管的额外的应力和尖峰， 可提高器件可靠性及降低器件成本， 有利于电磁干扰（EMI )。
对于图 3~图 3b所示的多路恒流驱动电路中， 主变压器的结构为： 包括一 个原边绕组和一个副边绕组， 由该副边绕组与各个整流滤波单元构成供电回 路； 在实际应用中， 主变压器的结构还可以为： 包括一个原边绕组和至少两个 副边绕组， 此时， 每一副边绕组对应一个整流滤波单元， 从而分别形成供电回 路， 此时， 图 3的电路结构变换为图 4所示的电路结构， 图 4与图 3的区别仅 在于主变压器的结构不同， 进而导致形成的供电回路略有不同。 同样的， 图
4a和图 4b给出了不同整流滤波单元下本发明多路恒流驱动电路的实现结构， 图 4a和图 4b分别对应图 3a和图 3b, 区别仅在于主变压器结构的不同， 这里 不再赘述。
或者， 对于图 3~图 3b所示的多路恒流驱动电路中， 主变压器的结构还可 以为： 包括至少两个原边绕组和至少两个副边绕组， 原边绕组、 副边绕组以及 整流滤波单元之间——对应。 此时， 每一副边绕组对应一个整流滤波单元， 从 而分别形成供电回路， 此时， 图 3的电路结构变化为图 5所示的电路结构， 图 5与图 3的区别仅在于主变压器的结构不同， 进而导致形成的供电回路略有不 同。 同样的， 图 5a和图 5b给出了不同整流滤波单元下本发明多路恒流驱动电 路的实现结构， 图 5a和图 5b分别对应图 3a和图 3b, 区别仅在于主变压器结 构的不同， 这里不再赘述。
进而， DC/AC变换器的实现本发明中并不限定， 可以为桥式电路、 推挽 电路、 反激电路、 正激电路、 串联谐振电路、 LLC类谐振电路或者软开关电 路其中的任何一种电路结构。 例如， 在图 6a~® 6e所示的本发明多路恒流驱 动电路实现结构中， DC/AC变换器的实现分别为 LLC谐振电路、 对称半桥电 路、 不对称半桥电路、 全桥电路以及推挽电路。
以上所示的多路恒流驱动电路均为 2路， 在实际应用中， 还可以扩展到 2 路以上的情况， 此时， 如图 7a~7c所示， 分别对应图 3a、 图 4a和图 5a。
如图 8a所示， 本发明还提供了另一种多路恒流驱动电路， 在该电路中包 括： DC/AC变换器、 主变压器；
DC/AC变换器为主变压器提供交流电压；
所述主变压器包括至少一个带抽头的副边绕组，所述抽头将对应的副边绕 组分为第一绕组和第二绕组， 第一绕组的异名端和第二绕组的同名端相连接； 所述主变压器的副边绕组中存在至少一个副边绕组，所述至少一个副边绕组中 的每一个副边绕组对应至少两级供电回路；
每一副边绕组的每一级供电回路包括： 第一整流回路和第二整流回路； 第 一整流回路包括： 该副边绕组的第一绕组的第一端通过整流滤波单元、之前各 级供电回路中设置的所有均流变压器的第三绕组、本级供电回路与下一级供电 回路共同对应的均流变压器的第一绕组连接所述副边绕组的第一绕组的第二 端； 第二整流回路包括： 该副边绕组的第二绕组的第一端通过本级供电回路与 下一级供电回路共同对应的均流变压器的第二绕组、之前各级供电回路中设置 的所有均流变压器的第四绕组以及整流滤波单元连接所述副边绕组的第一绕 组的第二端；
所述均流变压器包括四个绕组，用于实现相邻的整流滤波单元所在的不同 整流回路之间的均流。
其中，所述均流变压器的四个绕组中， 第一绕组和第二绕组的同名端流过 相反的电流， 第一绕组和第三绕组的同名端流过相反的电流， 第三绕组和第四 绕组的同名端流过相反的电流。 如图 8a所示， 所述整流滤波单元可以包括第一二极管 Dl、 第二二极管 D2以及第一电容 Cl。
具体的， 如图 8a所示， 其中的副边绕组对应着多级供电回路， 而每一级 供电回路都包括第一整流回路和第二整流回路， 其中，
在图 8a中， 第一整流回路包括： 该副边绕组的第一绕组的第一端依次通 过第一二极管 Dl、 之前各级供电回路中设置的所有均流变压器的第三绕组、 本级供电回路与下一级供电回路共同对应的均流变压器的第一绕组、以及第一 电容 C1连接所述副边绕组的第一绕组的第二端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容
Cl、 本级供电回路与下一级供电回路共同对应的均流变压器的第二绕组、 之 前各级供电回路中设置的所有均流变压器的第四绕组、 以及第二二极管 D2连 接所述副边绕组的第一绕组的第二端。
或者， 所述每一供电回路中， 第一整流回路可以包括： 该副边绕组的第一 绕组的第一端依次通过之前各级供电回路中设置的所有均流变压器的第三绕 组、本级供电回路与下一级供电回路共同对应的均流变压器的第一绕组、第一 二极管以及第一电容连接所述副边绕组的第一绕组的第二端；
第二整流回路可以包括：该副边绕组的第二绕组的第一端依次通过第一电 容、第二二极管、本级供电回路与下一级供电回路共同对应的均流变压器的第 二绕组、之前各级供电回路中设置的所有均流变压器的第四绕组连接所述副边 绕组的第一绕组的第二端。
从而，第 N-1个均流变压器实现前面 N-2路负载总电流和最后一路负载电 流的均流， 从而实现 N路负载电流之间的均流。
例如， 在图 8a中， 对于第 N-1级供电回路， 其第一整流回路包括： 该副 边绕组的第一绕组的第一端依次通过第一二极管 Dl、均流变压器丁81~均流变 压器 T8 ( N-2 ) 的第三绕组、 均流变压器 T8 ( N-1 ) 的第一绕组、 以及第一电 容 C1连接所述副边绕组的第一绕组的第二端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容 Cl、 均流变压器 T8 ( N-1 ) 的第二绕组、 均流变压器 T8 ( N-2 ) ~均流变压器
T81的第四绕组、以及第二二极管 D2连接所述副边绕组的第一绕组的第二端。
对于第 N级供电回路， 其第一整流回路包括： 该副边绕组的第一绕组的 第一端依次通过第一二极管 Dl、 均流变压器丁81~均流变压器 T8 ( N-1 )的第 三绕组、 以及第一电容 C1连接所述副边绕组的第一绕组的第二端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容
Cl、 均流变压器 T8 ( N-1 ) ~均流变压器 T81的第四绕组、 以及第二二极管
D2连接所述副边绕组的第一绕组的第二端。
这里， 由于第 N级供电回路不存在后一级供电回路， 因此， 第 N级供电 回路中不包括均流变压器的第一绕组和第二绕组。
另外， 图 8a中， 所述主变压器为包括一个原边绕组和一个副边绕组的变 压器； 在实际应用中， 所述主变压器还可以为： 包括一个原边绕组和至少两个 副边绕组的变压器； 或者， 包括至少两个原边绕组和至少两个副边绕组， 且， 原边绕组和副边绕组——对应的变压器等。此时， 主变压器的每一副边绕组都 可以对应着类似于图 8a所示的多级供电回路。
对于以上的技术方案， 主变压器所包括的副边绕组中， 可以全部副边绕组 中的每一个副边绕组都分别对应着所述至少两级供电回路； 或者，对于每一个 副边绕组而言，还可以对应着多个所述至少两级供电回路， 同样可以实现本发 明的多路恒流驱动电路。 或者， 也可以是全部副边绕组中的一部分（至少一个）副边绕组中的每一 个副边绕组分别对应着至少两级供电回路，而其他部分的副边绕组则可以使用 现有技术中的电路结构形成供电回路为负载供电， 进行电流的均流， 或者也可 以使用图 3~图 7c等本发明中的各种供电回路为负载供电， 进行电流的均流， 这里并不限制。
例如， 图 8a和图 7a所示的电路结构即可以结合在同一多路恒流驱动电路 中， 此时，
对于图 7a所示的驱动电路， 可以将与副边绕组连接的、 相互并联构成恒 流驱动电路的所有路（设为 M个（M>=2 ) )供电支路称为第一供电支路组； 而对于图 8a所示的驱动电路， 可以将与副边绕组连接的、 构成多级恒流驱动 电路的所有路供电支路称为第二供电支路组；
贝 |J , 如图 9a所示， 主变压器包括一个原边绕组和一个副边绕组， 则， 第 一供电支路组和第二供电支路组的输入端分别与主变压器的副边绕组的两端 连接，也即第一供电支路组和第二供电支路组并联于同一副边绕组上， 这里将 第一供电支路组与副边绕组连接构成的供电回路称为第一主供电回路，将第二 供电支路组与副边绕组连接构成的供电回路称为第二主供电回路； 此时， 为了 实现第一主供电回路总电流 Im和第二主供电回路中总电流 In之间的均流，则 可以在两个主供电回路之间再设置一个均流变压器 T90, 其中， 第一绕组和第 二绕组分别设置于第一主供电回路中副边绕组与第一供电支路组的输入端之 间；第三绕组和第四绕组分别设置于第二主供电回路中副边绕组与第二供电支 路组的输入端之间。
相应的，该电路也可以扩展到本发明的多路恒流驱动电路中包括至少一个 第一供电支路组和至少一个第二供电支路组的各种情况下， 或者，也可以扩展 到本发明的多路恒流驱动电路中包括至少两个第一供电支路组或者至少两个 第二供电支路组的情况。 例如， 图 9b~® 9c所示， 进而， 图 9a所示的电路还 可以扩展为主变压器包括一个原边绕组和多个副边绕组，或者多个原边绕组和 多个副边绕组的情况， 如图 9d~9e所示。 这里不再赘述。 另外， 本实施例中所述 DC/AC变换器也可以为桥式电路、 推挽电路、 反 激电路、 正激电路、 串联谐振电路、 LLC类谐振电路或者软开关电路其中的 任何一种电路结构， 具体参见图 6a~® 6e, 这里不再赘述。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通 技术人员来说， 在不脱离本发明原理的前提下， 还可以做出若干改进和润饰， 这些改进和润饰也应视为本发明的保护范围。
+

Claims

权 利 要 求
1、 一种多路恒流驱动电路， 其特征在于， 包括： DC/AC变换器、 主变压 器以及至少两个整流滤波单元；
DC/AC变换器为主变压器提供交流电压； 所述主变压器包括至少一个带 抽头的副边绕组，所述抽头将对应的副边绕组分为第一绕组和第二绕组， 第一 绕组的异名端和第二绕组的同名端相连接；
所述至少两个整流滤波单元分别与主变压器的副边绕组形成供电回路；每 一供电回路包括： 第一整流回路和第二整流回路， 所述第一整流回路和第二整 流回路分别用于进行正负半周交流电压的整流；所述第一绕组和第二绕组分别 位于所述第一整流回路和第二整流回路；
相邻的整流滤波单元所在的第一供电回路和第二供电回路之间设置一个 均流变压器， 所述均流变压器包括四个绕组， 分别位于第一供电回路和第二供 电回路所包含的整流回路中，用于实现相邻的整流滤波单元所在的不同整流回 路之间的均流。
2、 根据权利要求 1所述的电路， 其特征在于， 所述均流变压器的四个绕 组中， 第一绕组和第二绕组的同名端流过相反的电流， 第一绕组和第三绕组的 同名端流过相反的电流， 第三绕组和第四绕组的同名端流过相反的电流。
3、 根据权利要求 1所述的电路， 其特征在于， 所述整流滤波单元包括第 一二极管、 第二二极管以及第一电容； 贝' J ,
所述供电回路包括：副边绕组的第一绕组的同名端通过依次串接的第一二 极管以及第一电容连接第一绕组的异名端，第一二极管的阳极连接副边绕组的 第一绕组的同名端；副边绕组的第二绕组的同名端通过依次串接的第一电容和 第二二极管连接第二绕组的异名端，所述第二二极管的阳极连接副边绕组的第 二绕组的异名端。
4、 根据权利要求 3所述的电路， 其特征在于：
第一整流滤波单元所在的供电回路中，所述均流变压器的第一绕组串接于 副边绕组的第一绕组的同名端与第一电容之间；所述均流变压器的第二绕组串 接于副边绕组的第二绕组的异名端与第一电容之间； 第二整流滤波单元所在的供电回路中，所述均流变压器的第三绕组串接于 副边绕组的第一绕组的同名端与第一电容之间；所述均流变压器的第四绕组串 接于副边绕组的第二绕组的异名端与第一电容之间。
5、 根据权利要求 1所述的电路， 其特征在于， 所述整流滤波电路包括： 第三二极管、 第四二极管、 第一电感以及第二电容； 贝' J ,
所述供电回路包括：副边绕组的第一绕组的同名端通过依次串接的第三二 极管、第一电感以及第二电容连接第一绕组的异名端， 第三二极管的阳极连接 副边绕组的第一绕组的同名端；副边绕组的第二绕组的同名端通过依次串接的 第二电容、第一电感以及第四二极管连接第二绕组的异名端， 所述第四二极管 的阳极连接副边绕组的第二绕组的异名端。
6、 根据权利要求 5所述的电路， 其特征在于，
第一整流滤波单元所在的供电回路中，所述均流变压器的第一绕组串接于 副边绕组的第一绕组的同名端与第一电感之间；所述均流变压器的第二绕组串 接于副边绕组的第二绕组的异名端与第一电感之间；
第二整流滤波单元所在的供电回路中，所述均流变压器的第三绕组串接于 副边绕组的第一绕组的同名端与第一电感之间；所述均流变压器的第四绕组串 接于副边绕组的第二绕组的异名端与第一电感之间。
7、 根据权利要求 1至 6任一项所述的电路， 其特征在于， 所述主变压器 包括一个原边绕组和一个带抽头的副边绕组； 贝 ij ,
该带抽头的副边绕组分别与每个所述整流滤波单元形成供电回路。
8、 根据权利要求 1至 6任一项所述的电路， 其特征在于， 所述主变压器 包括一个原边绕组和至少两个带抽头的副边绕组，每一副边绕组对应一整流滤 波单元； 贝' J ,
每一副边绕组与该副边绕组对应的整流滤波单元形成供电回路。
9、 根据权利要求 1至 6任一项所述的电路， 其特征在于， 所述主变压器 包括至少两个原边绕组和至少两个带抽头的副边绕组，原边绕组、 副边绕组以 及整流滤波单元——对应； 则，
每一副边绕组与该副边绕组对应的整流滤波单元形成供电回路。
10、 根据权利要求 1至 4任一项所述的电路， 其特征在于， 所述 DC/AC 变换器为桥式电路、 推挽电路、 反激电路、 正激电路、 串联谐振电路、 LLC 类谐振电路或者软开关电路其中的任何一种电路结构。
11、 一种多路恒流驱动电路， 其特征在于， 包括： DC/AC变换器、 主变 压器；
DC/AC变换器为主变压器提供交流电压；
所述主变压器包括至少一个带抽头的副边绕组，所述抽头将对应的副边绕 组分为第一绕组和第二绕组， 第一绕组的异名端和第二绕组的同名端相连接； 所述主变压器的副边绕组中存在至少一个副边绕组，所述至少一个副边绕组中 的每一个副边绕组对应至少两级供电回路；
所述副边绕组的每一级供电回路包括： 第一整流回路和第二整流回路； 第 一整流回路包括： 该副边绕组的第一绕组的第一端通过整流滤波单元、之前各 级供电回路中设置的所有均流变压器的第三绕组、本级供电回路与下一级供电 回路共同对应的均流变压器的第一绕组连接所述副边绕组的第一绕组的第二 端； 第二整流回路包括： 该副边绕组的第二绕组的第一端通过本级供电回路与 下一级供电回路共同对应的均流变压器的第二绕组、之前各级供电回路中设置 的所有均流变压器的第四绕组以及整流滤波单元连接所述副边绕组的第一绕 组的第二端；
所述均流变压器包括四个绕组，用于实现相邻的整流滤波单元所在的不同 整流回路之间的均流。
12、 根据权利要求 11所述的电路， 其特征在于， 所述均流变压器的四个 绕组中， 第一绕组和第二绕组的同名端流过相反的电流， 第一绕组和第三绕组 的同名端流过相反的电流， 第三绕组和第四绕组的同名端流过相反的电流。
13、 根据权利要求 11所述的电路， 其特征在于， 所述整流滤波单元包括 第一二极管、 第二二极管以及第一电容。
14、 根据权利要求 13所述的电路， 其特征在于， 第一整流回路包括： 该 副边绕组的第一绕组的第一端依次通过之前各级供电回路中设置的所有均流 变压器的第三绕组、第一二极管、本级供电回路与下一级供电回路共同对应的 均流变压器的第一绕组、 以及第一电容连接所述副边绕组的第一绕组的第二 端；
第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容、 本级供电回路与下一级供电回路共同对应的均流变压器的第二绕组、第二二极 管、以及之前各级供电回路中设置的所有均流变压器的第四绕组连接所述副边 绕组的第一绕组的第二端。
15、 根据权利要求 13所述的电路， 其特征在于， 第一整流回路包括： 该 副边绕组的第一绕组的第一端依次通过之前各级供电回路中设置的所有均流 变压器的第三绕组、本级供电回路与下一级供电回路共同对应的均流变压器的 第一绕组、 第一二极管以及第一电容连接所述副边绕组的第一绕组的第二端； 第二整流回路包括： 该副边绕组的第二绕组的第一端依次通过第一电容、 第二二极管、本级供电回路与下一级供电回路共同对应的均流变压器的第二绕 组、之前各级供电回路中设置的所有均流变压器的第四绕组连接所述副边绕组 的第一绕组的第二端。
16、 根据权利要求 11至 15任一项所述的电路， 其特征在于， 所述主变压 器为：
包括一个原边绕组和一个副边绕组的变压器； 或者，
包括一个原边绕组和至少两个副边绕组的变压器； 或者，
包括至少两个原边绕组和至少两个副边绕组，且，原边绕组和副边绕组一 一对应的变压器。
17、根据权利要求 11至 15任一项所述的电路，其特征在于，所述 DC/AC 变换器为桥式电路、 推挽电路、 反激电路、 正激电路、 串联谐振电路、 LLC 类谐振电路或者软开关电路其中的任何一种电路结构。
18、 一种多路恒流驱动电路， 其特征在于， 包括： DC/AC变换器、 主变 压器；
DC/AC变换器为主变压器提供交流电压；
所述主变压器包括至少一个带抽头的副边绕组，所述抽头将对应的副边绕 组分为第一绕组和第二绕组， 第一绕组的异名端和第二绕组的同名端相连接； 所示主变压器的副边绕组与至少两个供电支路组连接， 分别构成主供电回路； 相邻的两个主供电回路之间设置一个均流变压器；均流变压器的第一绕组 和第二绕组设置于所述两个主供电回路的一个主供电回路中，而第三绕组和第 四绕组设置于所述两个主供电回路的另一个主供电回路中，用于进行两个主供 电回路之间的均流。
19、 根据权利要求 18所述的电路， 其特征在于， 所述两个主供电回路中 的至少一个主供电回路包括： 至少两级供电回路， 每一级供电回路包括： 第一 整流回路和第二整流回路； 第一整流回路包括： 对应副边绕组的第一绕组的第 一端通过整流滤波单元、之前各级供电回路中设置的所有均流变压器的第三绕 组、本级供电回路与下一级供电回路共同对应的均流变压器的第一绕组连接所 述副边绕组的第一绕组的第二端； 第二整流回路包括： 该副边绕组的第二绕组 的第一端通过本级供电回路与下一级供电回路共同对应的均流变压器的第二 绕组、之前各级供电回路中设置的所有均流变压器的第四绕组以及整流滤波单 元连接所述副边绕组的第一绕组的第二端； 所述均流变压器包括四个绕组， 用 于实现相邻的整流滤波单元所在的不同整流回路之间的均流。
20、 根据权利要求 18所述的电路， 其特征在于， 所述两个主供电回路中 的至少一个主供电回路包括： 至少两个供电回路，每一供电回路由一整流滤波 单元与主变压器的对应副边绕组构成， 包括第一整流回路和第二整流回路，对 应副边绕组的第一绕组和第二绕组分别位于所述第一整流回路和第二整流回 路中，所述第一整流回路和第二整流回路分别用于进行正负半周交流电压的整 流；相邻的整流滤波单元所在的第一供电回路和第二供电回路之间设置一个均 流变压器， 所述均流变压器包括四个绕组， 分别位于第一供电回路和第二供电 回路所包含的整流回路中，用于实现相邻的整流滤波单元所在的不同整流回路 之间的均流。
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