CN115566903B - Buck half-bridge soft-switching multi-path current-sharing LED output converter - Google Patents

Buck half-bridge soft-switching multi-path current-sharing LED output converter Download PDF

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CN115566903B
CN115566903B CN202211553554.5A CN202211553554A CN115566903B CN 115566903 B CN115566903 B CN 115566903B CN 202211553554 A CN202211553554 A CN 202211553554A CN 115566903 B CN115566903 B CN 115566903B
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diode
capacitor
load
switch tube
cathode
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CN115566903A (en
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吴宇恒
张�杰
谢卫冲
艾茜
邹晨
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Hubei University of Technology
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    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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]

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a buck half-bridge soft switchA current-sharing LED output converter comprises a DC power supplyV in Also comprises a switch tubeS 1 And a switch tubeS 2 Energy storage inductorL m And a diodeD i Capacitor and method for manufacturing the sameC k Load, and method of operating the sameR i I belongs to {1 to n }, k belongs to {1 to (n-1) }, wherein k is the serial number of the output branch, and n is the total number of the output branches. The invention can realize n-path constant current output by only using one inductor, has extremely small inductor quantity and can effectively reduce the cost. And the two switching tubes can realize zero voltage switching-on, so that the switching loss is greatly reduced.

Description

Buck half-bridge soft-switching multi-path current-sharing LED output converter
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a buck half-bridge soft-switching multi-path current-sharing LED output converter which is suitable for the fields of power electronics and the like.
Background
At present, the LEDs are often connected in series and in parallel in high-power occasions, current balance among all the LEDs is required to be controlled in order to improve reliability and service life of the LEDs, the current equalization is simple and easy to realize by using the characteristic of capacitance charge balance to carry out passive current equalization, but when multi-path current equalization is realized, an active switch and more inductive elements are often required, and the switching loss of the active switch of most converters is large, so that the efficiency of the converter is low.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a buck half-bridge soft-switching multi-path current-sharing LED output converter. The converter only uses two switching tubes, n diodes and one energy storage inductor to realize n paths of constant current output. With a very small number of inductances. Meanwhile, zero voltage switching-on is realized by the two switching tubes, so that switching loss is greatly reduced, and the efficiency is improved.
The above object of the present invention is achieved by the following technical means:
a buck half-bridge soft-switching multi-path current-sharing LED output converter comprises a direct-current power supplyV in Also comprises a switch tubeS 1 Switch tubeS 2 Energy storage inductorL m Diode, and method for manufacturing the sameD i Capacitor and method for manufacturing the sameC k Load, and method of operating the sameR i I belongs to {1 to n }, k belongs to {1 to (n-1) }, i and k are the serial numbers of the output branches, n is the total number of the output branches,
when n is an even number:
switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in Anode of (2), switching tubeS 2 Drain electrode of the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in The negative pole of the inductor is connected with an electrical ground GND and an energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second connecting end and capacitorC p P is an odd number, p =1, 3, n-1,
when i =1, diode D 1 Cathode and capacitor ofC 1 Is connected to the cathode of diode D 1 Anode and load ofR 1 Negative electrode connection of (2), loadR 1 Is connected to the electrical ground GND,
when i = n, the diode D n Anode and capacitor ofC n-1 Is connected to the cathode of diode D n Cathode and load ofR n Positive pole connection of (2), loadR n Is connected to the electrical ground GND,
when i is not equal to 1, i is not equal to n and i is even, the diode D i Anode and capacitor ofC i-1 Is connected to the cathode of a diode D i Cathode and loadR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i Is connected to an electrical ground GND which is,
when i ≠ 1 and i ≠ n and i is odd, the diode D i Cathode and capacitor ofC i Is connected to the cathode of a diode D i Anode and load ofR i Negative electrode connection of (2), loadR i Positive electrode of (2) through capacitorC i-1 Is connected to the electrical ground GND.
When n is an odd number as described above:
switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in Positive electrode of (2), switching tubeS 2 Drain electrode of the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in The negative pole of the inductor is connected with an electrical ground GND and an energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second connection terminal and capacitorC q Q is an odd number, q =1, 3, · n-2,
when i =1, diode D 1 Cathode and capacitor ofC 1 Is connected to the cathode of diode D 1 Anode and load ofR 1 Negative pole connection of (1), loadR 1 Is connected to the electrical ground GND,
when i = n, diode D n Cathode and energy storage inductorL m Second connection terminal, diode D n Anode and load ofR n Negative pole connection of (1), loadR n Positive electrode of (2) through capacitorC n-1 The connection to the electrical ground GND is made,
when i ≠ 1, i ≠ n, and i is an even number, diode D i Anode and capacitor ofC i-1 Is connected to the cathode of a diode D i Cathode and loadR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i The connection to the electrical ground GND is made,
when i ≠ 1, i ≠ n, and i is odd, diode D i Cathode and capacitor ofC i Is connected to the cathode of a diode D i Anode and load ofR i Negative electrode connection of (2), loadR i Positive electrode of (2) through capacitorC i-1 Is connected to the electrical ground GND.
Load as described aboveR i Is a light emitting diode LED i Parallel filteringCapacitor with a capacitor elementC oi Light Emitting Diode (LED) i As a loadR i Of a light emitting diode LED i As a loadR i The negative electrode of (1).
As mentioned above, the converter is divided into six operating modes:
mode 1: switch tubeS 1 Zero voltage switching-on, switching tubeS 2 Off, diodeD r Is conducted by bearing forward voltage, and the diodeD v And diodeD n Cut-off under reverse voltage, capacitanceC 1 ~ C （n-2） Charging, capacityC （n-1） Clamped, energy storing inductorL m Storing energy, r being an even numbered, r =2, 4,.. And n-2, v being an odd numbered, v =1, 3,.. And n-1,
mode 2: switch tubeS 1 Keep on, switch tubeS 2 Remains off, diodeD t Is conducted by bearing forward voltage, and the diodeD v Cut-off under reverse voltage, capacitanceC 1 ~ C （n-1） The charging is carried out on the electric power,L m storing energy, t being an even numbered, t =2, 4, · n,
modality 3: switch tubeS 1 Cut-off, switch tubeS 2 Remains off, diodeD t Is conducted by bearing forward voltage, and the diodeD v Cut-off under reverse voltage, capacitanceC 1 ~ C （n-1） Charging and energy-storing inductorL m Release energy to the switch tube S 1 Junction capacitor charging and switching tubeS 2 Junction capacitor discharge as a switching tubeS 2 A zero voltage turn-on condition is provided,
modality 4: switch tubeS 1 Keep off, switch tubeS 2 Zero voltage turn-on, diodeD u Is conducted by bearing forward voltage, and the diodeD t And diodeD 1 Cut-off under reverse voltage, capacitanceC 1 Clamped, capacitorC 2 ~ C （n-1） Discharging and energy-storing inductorL m Storing energy, u being an odd number, u =3, 5, · n-1,
mode 5: switch tubeS 1 Keep off, switch tubeS 2 Remains on, diodeD v Is conducted by bearing forward voltage, and the diodeD t Cut-off of bearing reverse voltage, capacitanceC 1 ~ C （n-1） The discharge is carried out, and the discharge is carried out,L m the energy is stored in the energy storage device,
modality 6: switch tubeS 1 Keep off, switch tubeS 2 Off, diodeD v Is conducted by bearing forward voltage, and the diodeD t Cut-off under reverse voltage, capacitanceC 1 ~ C （n-1） The discharge is carried out, and the discharge is carried out,L m release energy to the switch tubeS 1 Junction capacitor discharge, switch tubeS 2 Charging junction capacitor as switching tubeS 1 Providing a zero voltage turn-on condition.
Compared with the prior art, the invention has the following beneficial effects:
1. only one inductor is used for realizing n-path constant current output, the number of the inductors is extremely small, and the cost can be effectively reduced.
2. And the two switching tubes can realize zero-voltage switching-on, so that the switching loss is greatly reduced.
Drawings
FIG. 1 (a) is a schematic circuit diagram of a buck half-bridge soft-switching multi-path current-sharing LED output converter with an even number of output branches;
FIG. 1 (b) is a schematic circuit diagram of a buck half-bridge soft-switching multi-path current-sharing LED output converter with an odd number of output branches;
fig. 2 is a schematic circuit diagram of a buck half-bridge soft-switching multi-channel current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (a) is a schematic diagram of an operating mode 1 of a buck half-bridge soft-switching multi-channel current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (b) is a schematic diagram of an operating mode 2 of a buck half-bridge soft-switching multi-channel current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (c) is a schematic diagram of an operating mode 3 of a buck half-bridge soft-switching multi-way current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (d) is a schematic diagram of an operating mode 4 of a buck half-bridge soft-switching multi-way current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (e) is a schematic diagram of an operating mode 5 of a buck half-bridge soft-switching multi-way current-sharing LED output converter with an output branch n =4 in embodiment 3;
fig. 3 (f) is a schematic diagram of an operating mode 6 of a buck half-bridge soft-switching multi-channel current-sharing LED output converter with an output branch n =4 in embodiment 3;
FIG. 4 (a) shows a switching tubeS 1 、S 2 Is amplified by 100 times with the driving signal;
FIG. 4 (b) is a switching tubeS 1 、S 2 A waveform diagram of the current;
FIG. 4 (c) is a waveform diagram of the output current of the output branch of the buck half-bridge soft-switching multi-path current-sharing LED output converter.
Detailed Description
The present invention will be further described in detail below with reference to examples in order to facilitate understanding and practice of the invention by those of ordinary skill in the art, and it should be understood that the examples described herein are for illustration and explanation only and are not intended to limit the invention.
Example 1
For convenience of description and analysis, the parameters representing the voltage, current, etc. of the circuit elements are defined as follows:
a buck half-bridge soft-switching multi-path current-sharing LED output converter comprises n output branches, wherein n is larger than or equal to 3.d 1 、d 2 Are respectively defined as a switch tubeS 1 AndS 2 duty cycle of the on-time;T s time defined as one switching cycle;f s1 、f s2 is defined as a switch tubeS 1 、S 2 A switching frequency;V ds1 、V ds2 is defined as a switch tubeS 1 、S 2 Voltage and direction at two ends of the switch tubeS 1 、S 2 Drain to source;I s1 、I s2 is defined as a switch tubeS 1 、S 2 Current at both ends, direction andV ds1 、V ds2 in the same direction;V gs1 、V gs2 is defined as a switch tubeS 1 、S 2 Driving signal of grid and direction slave switch tubeS 1 、S 2 Gate to source;V LEDi (i =1, 2, · n) is defined as a light emitting diode LED i (i =1, 2,. N), the direction of the voltage across it being as shown in fig. 1 (a) and 1 (b) and the loadR i In the same direction;I LEDi (i =1, 2, · n) is defined as a light emitting diode LED i Average current over (i =1, 2, · n), direction andV LEDi (i =1, 2, · n) in the same direction;I Di (i =1, 2, · n) is defined as diode D i Average current over (i =1, 2, · n), direction from diode D i (i =1, 2,. N) from anode to cathode;V Ck (k =1, 2, · n-1) is defined as capacitanceC k (k =1, 2,. 1, n-1), the direction being as shown in fig. 1 (a) and 1 (b);QC kch (k =1, 2,. And n-1) is defined as the capacitance in one switching cycleC k (k =1, 2,. N-1) a charged amount of charge;QC kdis (k =1, 2,. And n-1) is defined as the capacitance in one switching cycleC k (k =1, 2,. N-1) an amount of charge discharged; the input voltage is defined as the DC supply voltageV in The direction is shown in FIG. 1 (a) and FIG. 1 (b).
A buck half-bridge soft-switching multi-path current-sharing LED output converter comprises n output branches, wherein n is more than or equal to 3, and the converter comprises a direct-current power supplyV in And a switch tubeS 1 Switch tubeS 2 Energy storage inductorL m Diode, and method for manufacturing the sameD i (i =1, 2, · n), capacitanceC k (k =1, 2,. N-1), loadR i (i =1, 2, · n), wherein the load isR i Can be equivalent to a Light Emitting Diode (LED) i (i =1, 2, n) is connected in parallel with a filter capacitorC oi (i =1, 2, · n), light emitting diode LED i As a load, of the anodeR i Of a light emitting diode LED i As a load, of a cathodeR i The negative electrode of (1).
When n is an even number
Switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in The positive electrode of (1). Switch tubeS 2 Drain electrode of the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in Is connected to electrical ground GND. Energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second connecting end and capacitorC p (p is an odd number, p =1, 3, n-1).
When i =1, diode D 1 Cathode and capacitor ofC 1 Is connected to the cathode of diode D 1 Anode and load ofR 1 Negative electrode connection of (2), loadR 1 Is connected to the electrical ground GND,
when i = n, diode D n Anode and capacitor ofC n-1 Is connected to the cathode of a diode D n Cathode and loadR n Positive pole connection of (2), loadR n Is connected to the electrical ground GND,
when i ≠ 1, i ≠ n, and i is an even number, diode D i Anode and capacitor ofC i-1 Is connected to the cathode of diode D i Cathode and loadR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i Connecting an electrical connectionThe gas-to-ground GND,
when i ≠ 1, i ≠ n, and i is odd, diode D i Cathode and capacitor ofC i Is connected to the cathode of a diode D i Anode and load ofR i Negative pole connection of (1), loadR i Positive electrode of (2) through capacitorC i-1 The electrical ground GND is connected.
To simplify the analysis, assume:
(1) All the switch tubes, diodes, capacitors and inductors are ideal devices.
(2) Capacitor with a capacitor elementC 1 ~ C （n-1） All the capacitance values are equal.
(3) Energy storage inductorL m Operating in CCM (inductor current continuous) mode.
The converter can be divided into six working modes:
mode 1: switch tubeS 1 Zero voltage switching-on and switching tubeS 2 Off, diodeD r (r is an even number, r =2, 4,.. And n-2) is conducted under a forward voltage, and the diodeD v (v is odd number, v =1, 3,.. And n-1) and diodesD n Cut-off of bearing reverse voltage, capacitanceC 1 ~ C （n-2） Charging, capacityC （n-1） Clamped, energy storing inductorL m Energy is stored.
Mode 2: switch tubeS 1 Keep on, switch tubeS 2 Remains off, diodeD t (t is even number, t =2, 4,. And n) is conducted by the forward voltage, and the diodeD v (v is odd number, v =1, 3, n-1) is subject to reverse voltage cut-off, and the capacitorC 1 ~ C （n-1） The charging is carried out by the electric charging device,L m energy is stored.
Modality 3: switch tubeS 1 Switch-off and switch-on tubeS 2 Remains off, diodeD t (t is even number, t =2, 4, n) is conducted by bearing forward voltage, and the diodeD v (v is odd)Number v =1, 3, · n-1) is subject to reverse voltage cut-off, capacitanceC 1 ~C （n-1） Charging and energy-storing inductorL m Release energy to the switching tube S 1 Junction capacitor charging and switching tubeS 2 Junction capacitor discharge as a switching tubeS 2 A zero voltage turn-on condition is provided.
Modality 4: switch tubeS 1 Keep off, switch tubeS 2 Zero voltage turn-on, diodeD u (u is odd number, u =3, 5, 1, n-1) is conducted by receiving forward voltage, and the diodeD t (t is an even number, t =2, 4,. Eta., n) and a diodeD 1 Cut-off under reverse voltage, capacitanceC 1 Clamped, capacitorC 2 ~ C （n-1） Discharging and energy-storing inductorL m Energy is stored.
Mode 5: switch tubeS 1 Keep off, switch tubeS 2 Remains on, diodeD v (v is odd number, v =1, 3, 1, n-1) is conducted by receiving forward voltage, and the diodeD t (t is even number, t =2, 4,. Eta., n) is cut off by bearing reverse voltage, and the capacitorC 1 ~ C （n-1） The discharge is carried out, and the discharge is carried out,L m energy is stored.
Modality 6: switch tubeS 1 Keep off, switch tubeS 2 Off, diodeD v (v is odd number, v =1, 3,.. And n-1) is conducted by bearing forward voltage, and the diodeD t (t is even number, t =2, 4,. Eta., n) is cut off by bearing reverse voltage, and the capacitorC 1 ~C （n-1） The discharge is carried out, and the discharge is carried out,L m release energy to the switch tubeS 1 Junction capacitor discharge, switch tubeS 2 Charging junction capacitor as switching tubeS 1 Providing a zero voltage turn-on condition.
Example 2
A buck half-bridge soft-switching multi-path current-sharing LED output converter comprises a total of n output branches, n is greater than or equal to 3,including a DC power supplyV in Switch tubeS 1 Switch tubeS 2 Energy storage inductorL m Diode, and method for manufacturing the sameD i (i =1, 2, · n), capacitanceC k (k =1, 2,. N-1), loadR i (i =1, 2, · n), wherein the load isR i Can be equivalent to a Light Emitting Diode (LED) i (i =1, 2, n) is connected in parallel with a filter capacitorC oi (i =1, 2, · n), light emitting diode LED i As a loadR i Of a light emitting diode LED i As a load, of a cathodeR i The negative electrode of (1).
When n is an odd number
Switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in The positive electrode of (1). Switch tubeS 2 Drain electrode of the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in Is connected to electrical ground GND. Energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second connecting end and capacitorC q (q is an odd number, q =1, 3,. And n-2) are connected.
When i =1, diode D 1 Cathode and capacitor ofC 1 Is connected to the cathode of a diode D 1 Anode and load ofR 1 Negative electrode connection of (2), loadR 1 Is connected to the electrical ground GND,
when i = n, the diode D n Cathode and energy storage inductorL m Second connection terminal, diode D n Anode and load ofR n Negative pole connection of (1), loadR n Positive electrode of (2) through capacitorC n-1 Is connected to an electrical ground GND which is,
when i is not equal to 1, i is not equal to n and i is even, the diode D i Anode and capacitor ofC i-1 Is connected to the negative pole of the diodePipe D i Cathode and load ofR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i The connection to the electrical ground GND is made,
when i ≠ 1, i ≠ n, and i is odd, diode D i Cathode and capacitor ofC i Is connected to the cathode of diode D i Anode and load ofR i Negative electrode connection of (2), loadR i Positive electrode of (2) through capacitorC i-1 Is connected to the electrical ground GND.
The operation mode of the converter is similar to that of embodiment 1, and is not described in detail herein.
Example 3
A buck half-bridge soft-switching multi-path current-sharing LED output converter is disclosed, wherein n is an even number 4, and the rest is the same as that of the embodiment 1, as shown in FIG. 2.
To simplify the analysis, assume:
(1) All the switch tubes, diodes, capacitors and inductors are ideal devices.
(2) Capacitor with a capacitor elementC k The capacitance values of (k =1, 2,. And n-1) are all equal.
(3) Energy storage inductorL m Operating in CCM (inductor current continuous) mode.
As shown in fig. 2, the converter can be divided into six operating modes.
Mode 1: switch tubeS 1 Zero voltage switching-on and switching tubeS 2 Off, diodeD 2 Is conducted by bearing forward voltage, and the diodeD 1 、D 3 AndD 4 cut-off of bearing reverse voltage, capacitanceC 1 AndC 2 charging, capacityC 3 Clamped, energy storing inductorL m Energy is stored.
Mode 2: switch tubeS 1 Keep on, switch tubeS 2 Remains off, diodeD 2 AndD 4 is conducted by bearing forward voltage, and the diodeD 1 AndD 3 cut-off under reverse voltage, capacitanceC 1 、C 2 AndC 3 the charging is carried out on the electric power,L m energy is stored.
Modality 3: switch tubeS 1 Switch-off and switch-on tubeS 2 Remains off, diodeD 2 AndD 4 is conducted by bearing forward voltage, and the diodeD 1 AndD 3 cut-off under reverse voltage, capacitanceC 1 、C 2 AndC 3 charging and energy-storing inductorL m Release energy to the switching tube S 1 Junction capacitor charging and switching tubeS 2 Junction capacitor discharge as a switching tubeS 2 Providing a zero voltage turn-on condition.
Modality 4: switch tubeS 1 Keep off, switch tubeS 2 Zero voltage turn-on, diodeD 3 Is conducted by bearing forward voltage, and the diodeD 1 、D 2 AndD 4 cut-off of bearing reverse voltage, capacitanceC 1 Clamped, capacitorC 2 AndC 3 discharging and energy-storing inductorL m Energy is stored.
Modality 5: switch tubeS 1 Keep off, switch tubeS 2 Remains on, diodeD 1 AndD 3 is conducted by bearing forward voltage, and the diodeD 2 AndD 4 cut-off under reverse voltage, capacitanceC 1 、C 2 AndC 3 the discharge is carried out, and the discharge is carried out,L m energy is stored.
Modality 6: switch tubeS 1 Keep off, switch tubeS 2 Off, diodeD 1 AndD 3 is conducted by bearing forward voltage, and the diodeD 2 AndD 4 cut-off under reverse voltage, capacitanceC 1 、C 2 AndC 3 the discharge is carried out on the electric discharge wire,L m release energy to the switch tubeS 1 Junction capacitor discharge, switch tubeS 2 Charging junction capacitor as switching tubeS 1 Providing zero voltage onAnd (4) carrying out the following conditions.
From the charge-discharge process of the capacitor in the above mode, the following can be obtained:
Figure 600888DEST_PATH_IMAGE001
（1）
charge balance formula combined with balance capacitance:
Figure 680839DEST_PATH_IMAGE002
（2）
simultaneous equations (1), (2) can yield:
Figure 503302DEST_PATH_IMAGE003
（3）
therefore, by utilizing a charge balance mechanism of the capacitor, the current of each output branch of the converter can be automatically balanced.
Simulations are built on a Psim platform according to the converter of the embodiment shown in fig. 3 (a) - (f), and main simulation waveforms of a buck half-bridge soft-switching four-way current-sharing LED are shown in fig. 4 (a) - (c). The main simulation parameters are set as follows, namely the voltage of a direct-current power supplyV in =200V, switching frequencyf s1 = f s2 =67kHz, duty cycled 1 =0.4，d 2 =0.5, energy storage inductanceL m =25uH, capacitanceC 1 =C 2 =C 3 =2uF, filter capacitanceC o1 、C o2 、C o3 、C o4 =10uF, loadR 1 、R 2 、R 3 、R 4 The equivalent impedances are 100 Ω, 80 Ω, 60 Ω, and 40 Ω, respectively.
Wherein, FIG. 4 (a) shows a switching tubeS 1 、S 2 Voltage and driving signal of (2) is amplified by 100 times, and FIG. 4 (b) is a waveform diagram of the switching tubeS 1 、S 2 The waveform of the current, and FIG. 4 (c) is the waveform of the branch currentFigure (a).
Based on the analysis and simulation, the buck half-bridge soft-switching multi-path current-sharing LED output converter has the following advantages:
1. only one inductor is used for realizing n-path constant current output, the number of the inductors is extremely small, and the cost can be effectively reduced.
2. And the two active switching tubes can realize zero-voltage switching-on, so that the switching loss is greatly reduced.
The converter is therefore very suitable for LED driving.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the protection scope of the present invention. Therefore, the scope of the invention should be determined by the appended claims and all changes that can be made without departing from the principles of the invention.

Claims (1)

1. A buck half-bridge soft-switching multi-path current-sharing LED output converter comprises a direct-current power supplyV in It is characterized by also comprising a switch tubeS 1 Switch tubeS 2 Energy storage inductorL m Diode, and method for manufacturing the sameD i And a capacitorC k Load, and method of operating the sameR i I belongs to {1 to n }, k belongs to {1 to (n-1) }, i and k are the serial numbers of output branches, n is the total number of the output branches,
when n is an even number:
switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in Anode of (2), switching tubeS 2 Drain electrode of the switch tube is connected with the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in The negative pole of the inductor is connected with an electrical ground GND and an energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second oneConnection terminal and capacitorC p P is an odd number, p =1, 3, n-1,
when i =1, the diode D 1 Cathode and capacitor ofC 1 Is connected to the cathode of diode D 1 Anode and load ofR 1 Negative pole connection of (1), loadR 1 Is connected to the electrical ground GND,
when i = n, diode D n Anode and capacitor ofC n-1 Is connected to the cathode of diode D n Cathode and loadR n Positive pole connection of (2), loadR n Is connected to the electrical ground GND,
when i ≠ 1, i ≠ n, and i is an even number, diode D i Anode and capacitor ofC i-1 Is connected to the cathode of diode D i Cathode and loadR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i The connection to the electrical ground GND is made,
when i ≠ 1 and i ≠ n and i is odd, the diode D i Cathode and capacitor ofC i Is connected to the cathode of a diode D i Anode and load ofR i Negative pole connection of (1), loadR i Positive electrode of (2) through capacitorC i-1 The connection to the electrical ground GND is made,
when n is an odd number:
switch tubeS 1 Drain electrode of the capacitor is connected with a direct current power supplyV in Anode of (2), switching tubeS 2 Drain electrode of the switch tubeS 1 Source electrode of (2), switching tubeS 2 Source electrode of the transistor is connected with a direct current power supplyV in Negative electrode of (2), DC power supplyV in The negative pole of the inductor is connected with an electrical ground GND and an energy storage inductorL m The first connecting ends are respectively connected with the switch tubesS 1 Source electrode and switching tubeS 2 Is connected with the drain electrode of the energy storage inductorL m Second connecting end and capacitorC q Q is an odd number, q =1, 3, n-2,
when i =1, diode D 1 Cathode and capacitor ofC 1 Is connected to the negative pole of the diodePipe D 1 Anode and load ofR 1 Negative pole connection of (1), loadR 1 Is connected to the electrical ground GND,
when i = n, diode D n Cathode and energy storage inductorL m Second connection terminal, diode D n Anode and load ofR n Negative electrode connection of (2), loadR n Positive electrode of (2) through capacitorC n-1 Is connected to an electrical ground GND which is,
when i is not equal to 1, i is not equal to n and i is even, the diode D i Anode and capacitor ofC i-1 Is connected to the cathode of diode D i Cathode and loadR i Positive pole connection of (2), loadR i Negative electrode of (2) passing through capacitorC i The connection to the electrical ground GND is made,
when i ≠ 1, i ≠ n, and i is odd, diode D i Cathode and capacitor ofC i Is connected to the cathode of a diode D i Anode and load ofR i Negative pole connection of (1), loadR i Positive electrode of (2) through capacitorC i-1 The connection to the electrical ground GND is made,
the loadR i Is a light emitting diode LED i Parallel filter capacitorC oi Light Emitting Diode (LED) i As a load, of the anodeR i Of a light emitting diode LED i As a load, of a cathodeR i The anode of (a) is provided,
the converter is divided into six working modes:
mode 1: switch tubeS 1 Zero voltage switching-on, switching tubeS 2 Off, diodeD r Is conducted by bearing forward voltage, and the diodeD v And diodeD n Cut-off under reverse voltage, capacitanceC 1 ~ C （n-2） Charging, capacityC （n-1） Clamped, energy storing inductorL m Storing energy, r being an even numbered number, r =2, 4,. Eta., n-2, v being an odd numbered number, v =1, 3,. Eta., n-1,
mode 2: switch tubeS 1 Is kept on and offPipe closing deviceS 2 Remains off, diodeD t Is conducted by bearing forward voltage, and the diodeD v Cut-off under reverse voltage, capacitanceC 1 ~ C （n-1） The charging is carried out on the electric power,L m storing energy, t being an even numbered, t =2, 4, · n,
modality 3: switch tubeS 1 Cut-off, switch tubeS 2 Remains off, diodeD t Is conducted by bearing forward voltage, and the diodeD v Cut-off of bearing reverse voltage, capacitanceC 1 ~ C （n-1） Charging and energy-storing inductorL m Release energy to the switch tube S 1 Junction capacitor charging and switching tubeS 2 Junction capacitor discharge as a switching tubeS 2 A zero voltage turn-on condition is provided,
modality 4: switch tubeS 1 Keep off, switch tubeS 2 Zero voltage turn-on, diodeD u Is conducted by bearing forward voltage, and the diodeD t And diodeD 1 Cut-off of bearing reverse voltage, capacitanceC 1 Clamped, capacitorC 2 ~ C （n-1） Discharging and energy-storing inductorL m Stored energy, u being an odd number, u =3, 5,. Eta., n-1,
modality 5: switch tubeS 1 Keep off, switch tubeS 2 Remains on, diodeD v Is conducted by bearing forward voltage, and the diodeD t Cut-off of bearing reverse voltage, capacitanceC 1 ~ C （n-1） The discharge is carried out, and the discharge is carried out,L m the energy is stored in the energy storage device,
modality 6: switch tubeS 1 Keep off, switch tubeS 2 Off, diodeD v Is conducted by bearing forward voltage, and the diodeD t Cut-off under reverse voltage, capacitanceC 1 ~ C （n-1） The discharge is carried out, and the discharge is carried out,L m release energy to the switch tubeS 1 Junction capacitor discharge, switch tubeS 2 Junction capacitor is charged to openPipe closing deviceS 1 Providing a zero voltage turn-on condition.
CN202211553554.5A 2022-12-06 2022-12-06 Buck half-bridge soft-switching multi-path current-sharing LED output converter Active CN115566903B (en)

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