CN111564957B - Circuit and driving power supply based on half-bridge IC drives full bridge - Google Patents

Circuit and driving power supply based on half-bridge IC drives full bridge Download PDF

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Publication number
CN111564957B
CN111564957B CN202010444131.4A CN202010444131A CN111564957B CN 111564957 B CN111564957 B CN 111564957B CN 202010444131 A CN202010444131 A CN 202010444131A CN 111564957 B CN111564957 B CN 111564957B
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driving
circuit
winding
bridge
transformer
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CN111564957A (en
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王宗友
徐辉
汤波兵
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Shenzhen Sosen Electronics Co Ltd
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Shenzhen Sosen Electronics Co Ltd
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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
    • H02M1/00—Details of apparatus for conversion
    • 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]
    • 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]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a circuit and a driving power supply based on a half-bridge IC driving full bridge, comprising: the driving circuit comprises a driving transformer, a first driving circuit, a second driving circuit and a full-bridge circuit; a primary winding of the driving transformer is connected with the half-bridge IC, a first secondary winding of the driving transformer is connected with the input end of the first driving circuit, and a second secondary winding of the driving transformer is connected with the input end of the second driving circuit; the output end of the first driving circuit is respectively connected with the full-bridge circuit and the first input end of the primary winding of the main transformer, and the output end of the second driving circuit is respectively connected with the second input end of the full-bridge circuit and the second input end of the primary winding of the main transformer. The half-bridge full-bridge driving circuit can realize half-bridge full-bridge driving only by one driving transformer, the first driving circuit and the second driving circuit, effectively reduces the volume of the driving transformer, and has less peripheral device requirements and small maintenance difficulty.

Description

Circuit and driving power supply based on half-bridge IC drives full bridge
Technical Field
The invention relates to the technical field of driving power supplies, in particular to a circuit for driving a full bridge based on a half-bridge IC and a driving power supply.
Background
LEDs are gradually replacing traditional lighting sources and are finding wider and wider application in various lighting fields. Along with the increasing development of social and economic construction, the level of urban road infrastructure illumination construction becomes an important sign of the speed and the level of urban development, and the quality of illumination engineering not only influences the safety of vehicles and pedestrians, but also relates to the realization of energy-saving and environment-friendly targets. The current road lighting energy consumption is very serious, and the main problems of the existing road lighting energy consumption are that the design of a lighting system exceeds the standard, the lighting control mode is backward, the lighting energy-saving concept is wrong, the lighting energy-saving measure is single, more importantly, the abnormal protection occurs, and the like.
Outdoor lighting requires proper operation regardless of weather conditions, especially in remote areas. For example, the output of an LED power supply is unstable due to the fluctuation of the power grid voltage, so that the whole lamp cannot work normally, therefore, the requirement of the application field on an outdoor lighting power supply is higher, the basic electrical performance of the power supply needs to meet the requirements, the power grid voltage requirements, the safety requirements and the EMC requirements of various countries, and more importantly, the driving power supply and the LED lamp can be protected in time when abnormality occurs. However, the transformer of the existing LED driving power supply has a large volume and many peripheral parts, which further increases the maintenance difficulty.
Disclosure of Invention
The present invention provides a circuit and a driving power supply for driving a full bridge based on a half bridge IC, which address the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a circuit based on a half-bridge IC drive full bridge is constructed, and comprises: the driving circuit comprises a driving transformer, a first driving circuit, a second driving circuit and a full-bridge circuit;
the primary winding of the driving transformer is connected with the half-bridge IC, the first secondary winding of the driving transformer is connected with the input end of the first driving circuit, and the second secondary winding of the driving transformer is connected with the input end of the second driving circuit; the output end of the first driving circuit is respectively connected with the full-bridge circuit and the first input end of the primary winding of the main transformer, and the output end of the second driving circuit is respectively connected with the second input ends of the full-bridge circuit and the primary winding of the main transformer;
the first driving circuit and the second driving circuit drive the full-bridge circuit to be conducted according to signals output by the first secondary winding and the second secondary winding of the driving transformer respectively so as to output driving signals to the main transformer.
In one embodiment, further comprising: the signal enhancement circuit is arranged between the primary winding of the driving transformer and the half-bridge IC;
and the signal enhancement circuit receives the signal output by the half-bridge IC, enhances the received signal and then sends the signal to the primary winding of the driving transformer.
In one embodiment, the signal enhancement circuit comprises: a first boost circuit and a second boost circuit;
the input end of the first enhancement circuit is connected with the first output end of the half-bridge IC, and the output end of the first enhancement circuit is connected with the dotted end of the primary winding of the driving transformer;
the input end of the second enhancement circuit is connected with the second output end of the half-bridge IC, and the output end of the second enhancement circuit is connected with the synonym end of the primary winding of the driving transformer.
In one embodiment, the full bridge circuit includes: the MOS transistor comprises a first main MOS transistor, a second main MOS transistor, a third main MOS transistor, a fourth main MOS transistor, a first auxiliary circuit, a second auxiliary circuit, a third auxiliary circuit and a fourth auxiliary circuit;
the input end of the first auxiliary circuit is connected with the first output end of the first driving circuit, the output end of the first auxiliary circuit is connected with the first main MOS tube, and the second output end of the first driving circuit is connected with the first input end of the primary winding of the main transformer; the input end of the second auxiliary circuit is connected with the third output end of the second driving circuit, the output end of the second auxiliary circuit is connected with the second main MOS tube, and the second output end of the second driving circuit is connected with the second input end of the primary winding of the main transformer;
the input end of the third auxiliary circuit is connected with the first output end of the second driving circuit, and the output end of the third auxiliary circuit is connected with the third main MOS tube; the input end of the fourth auxiliary circuit is connected with the third output end of the first driving circuit, and the output end of the fourth auxiliary circuit is connected with the fourth main MOS tube;
the output end of the first driving circuit comprises a first output end, a second output end and a third output end, and the output end of the second driving circuit comprises a first output end, a second output end and a third output end.
In one embodiment, the first driving circuit includes: a first drive capacitor and a first drive inductor;
the first end of the first driving capacitor is connected with the homonymous end of the first secondary winding of the driving transformer, the second end of the first driving capacitor is connected with the homonymous end of the first winding of the first driving inductor, and the heteronymous end of the first winding of the first driving inductor is connected with the heteronymous end of the first secondary winding of the driving transformer; the synonym end of the first secondary winding of the driving transformer is connected with the first input end of the primary winding of the main transformer, and the synonym end of the first winding of the first driving inductor is also connected with the first input end of the primary winding of the main transformer; the homonymous end of the second winding of the first driving inductor is connected with the input end of the fourth auxiliary circuit, and the heteronymous end of the second winding of the first driving inductor is grounded;
the dotted terminal of the first secondary winding of the driving transformer is the first output terminal of the first driving circuit, the synonym terminal of the first winding of the first driving inductor is the second output terminal of the first driving circuit, and the dotted terminal of the second winding of the first driving inductor is the third output terminal of the first driving circuit.
In one embodiment, the second driving circuit includes: a second drive capacitor and a second drive inductor;
the first end of the second driving capacitor is connected with the synonym end of the second secondary winding of the driving transformer, the second end of the second driving capacitor is connected with the synonym end of the first winding of the second driving inductor, and the synonym end of the first winding of the second driving inductor is connected with the synonym end of the second secondary winding of the driving transformer; the synonym end of the second secondary winding of the driving transformer is connected with the input end of the third auxiliary circuit, the synonym end of the first winding of the second driving inductor is connected with the second input end of the primary winding of the main transformer, the synonym end of the second winding of the second driving inductor is connected with the input end of the second auxiliary circuit, and the synonym end of the second winding of the second driving inductor is grounded;
the different name end of the second secondary winding of the driving transformer is the first output end of the second driving circuit, the different name end of the first winding of the second driving inductor is the second output end of the second driving circuit, and the same name end of the second winding of the second driving inductor is the third output end of the second driving circuit.
In one embodiment, the first driving inductor is made of manganese zinc, and the number of turns of the first winding and the second winding of the first driving inductor is 1: 1.
in one embodiment, the second driving inductor is made of manganese zinc, and the number of turns of the first winding and the second winding of the second driving inductor is 1: 1.
the invention also provides a driving power supply which is characterized by comprising the circuit based on the half-bridge IC driving full bridge.
The AAA implementing the invention has the following beneficial effects:
drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic block diagram of a first embodiment of a circuit for driving a full bridge based on a half bridge IC according to the present invention;
FIG. 2 is a schematic block diagram of a second embodiment of a circuit for driving a full bridge based on a half bridge IC according to the present invention;
fig. 3 is a circuit diagram of a second embodiment of a circuit for driving a full bridge based on a half bridge IC according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of a first embodiment of a circuit for driving a full bridge based on a half bridge IC according to the present invention.
As shown in fig. 1, the circuit for driving a full bridge based on a half bridge IC comprises: a driving transformer 10, a first driving circuit 20, a second driving circuit 30, and a full bridge circuit 40.
A primary winding of the driving transformer 10 is connected with the half-bridge IC, a first secondary winding of the driving transformer 10 is connected with an input end of the first driving circuit 20, and a second secondary winding of the driving transformer 10 is connected with an input end of the second driving circuit 30; the output end of the first driving circuit 20 is respectively connected with the full-bridge circuit 40 and a first input end of a primary winding of the main transformer, and the output end of the second driving circuit 30 is respectively connected with the full-bridge circuit 40 and a second input end of the primary winding of the main transformer; the first and second driving circuits 20 and 30 drive the full bridge circuit 40 to be turned on according to signals output from the first and second secondary windings of the driving transformer 10, respectively, to output driving signals to the main transformer.
In the embodiment of the present invention, the first driving circuit 20 and the second driving circuit 30 are respectively disposed at the output end of the first secondary winding and the output end of the second secondary winding of the driving transformer 10, so as to achieve the effect of half-bridge full-bridge push.
Further, referring to fig. 2, a schematic block diagram of a second embodiment of a circuit based on a half-bridge IC driving a full bridge according to an embodiment of the present invention is provided.
As shown in fig. 2, on the basis of the first embodiment, the embodiment further includes: a signal enhancement circuit 50 disposed between the primary winding of the driving transformer 10 and the half-bridge IC; the signal enhancement circuit 50 receives the signal output by the half-bridge IC, performs enhancement processing on the received signal, and sends the signal to the primary winding of the driving transformer 10.
Further, as shown in fig. 2, the signal enhancement circuit 50 includes: a first boost circuit 501 and a second boost circuit 502.
The input end of the first enhancement circuit 501 is connected to the first output end of the half-bridge IC, and the output end of the first enhancement circuit 501 is connected to the dotted end of the primary winding of the driving transformer 10; the input terminal of the second boost circuit 502 is connected to the second output terminal of the half-bridge IC, and the output terminal of the second boost circuit is connected to the synonym terminal of the primary winding of the driving transformer 10.
In the present embodiment, the full bridge circuit 40 includes: a first main MOS tube 405, a second main MOS tube 406, a third main MOS tube 407, a fourth main MOS tube 408, a first auxiliary circuit 401, a second auxiliary circuit 402, a third auxiliary circuit 403, and a fourth auxiliary circuit 404.
The input end of the first auxiliary circuit 401 is connected with the first output end of the first driving circuit 20, the output end of the first auxiliary circuit 401 is connected with the first main MOS tube 405, and the second output end of the first driving circuit 20 is connected with the first input end of the primary winding of the main transformer; the input end of the second auxiliary circuit 402 is connected to the third output end of the second driving circuit 30, the output end of the second auxiliary circuit 402 is connected to the second main MOS transistor 406, and the second output end of the second driving circuit 30 is connected to the second input end of the primary winding of the main transformer; the input end of the third auxiliary circuit 403 is connected to the first output end of the second driving circuit 30, and the output end of the third auxiliary circuit 403 is connected to the third main MOS transistor 407; an input end of the fourth auxiliary circuit 404 is connected to the third output end of the first driving circuit 20, and an output end of the fourth auxiliary circuit 404 is connected to the fourth main MOS transistor 408.
The output end of the first driving circuit 20 includes a first output end, a second output end and a third output end, and the output end of the second driving circuit 30 includes a first output end, a second output end and a third output end.
Further, in the present embodiment, the first driving circuit 20 includes: a first driving capacitor C203 and a first driving inductor L201.
A first end of the first driving capacitor C203 is connected to a dotted end of the first secondary winding of the driving transformer 10, a second end of the first driving capacitor C203 is connected to a dotted end of the first winding L201-a of the first driving inductor L201, and a dotted end of the first winding L201-a of the first driving inductor L201 is connected to a dotted end of the first secondary winding of the driving transformer 10; the synonym end of the first secondary winding of the driving transformer 10 is connected with the first input end of the primary winding of the main transformer, and the synonym end of the first winding L201-A of the first driving inductor L201 is also connected with the first input end of the primary winding of the main transformer; the dotted terminal of the second winding L201-B of the first driving inductor L201 is connected to the input terminal of the fourth auxiliary circuit 404, and the dotted terminal of the second winding L201-B of the first driving inductor L201 is grounded.
The dotted terminal of the first secondary winding of the driving transformer 10 is a first output terminal of the first driving circuit 20, the synonym terminal of the first winding L201-a of the first driving inductor L201 is a second output terminal of the first driving circuit 20, and the dotted terminal of the second winding L201-B of the first driving inductor L201 is a third output terminal of the first driving circuit 20.
Further, in the present embodiment, the second drive circuit 30 includes: a second drive capacitor C204 and a second drive inductor L202.
A first end of the second driving capacitor C204 is connected to the synonym end of the second secondary winding of the driving transformer 10, a second end of the second driving capacitor C204 is connected to the synonym end of the first winding L202-a of the second driving inductor L202, and the synonym end of the first winding L202-a of the second driving inductor L202 is connected to the synonym end of the second secondary winding of the driving transformer 10; the synonym terminal of the second secondary winding of the driving transformer 10 is connected to the input terminal of the third auxiliary circuit 403, the synonym terminal of the first winding L202-a of the second driving inductor L202 is connected to the second input terminal of the primary winding of the main transformer, the synonym terminal of the second winding L202-B of the second driving inductor L202 is connected to the input terminal of the second auxiliary circuit 402, and the synonym terminal of the second winding L202-B of the second driving inductor L202 is grounded.
The end of the second secondary winding of the driving transformer 10 with different name is a first output end of the second driving circuit 30, the end of the first winding L202-a of the second driving inductor L202 with different name is a second output end of the second driving circuit 30, and the end of the second winding L202-B of the second driving inductor L202 with the same name is a third output end of the second driving circuit 30.
Further, the first driving inductor L201 of the embodiment of the present invention is an inductor made of manganese zinc, and the number of turns of the first winding L201-a and the second winding L201-B of the first driving inductor L201 is 1: 1. that is, the magnetic core of the first driving inductor L201 is made of manganese zinc, and during winding, a three-layer insulating wire and a copper wire are wound in parallel.
Further, the second driving inductor L202 of the embodiment of the present invention is an inductor made of manganese zinc, and the number of turns of the first winding L202-a and the second winding L202-B of the second driving inductor L202 is 1: 1. that is, the magnetic core used by the second driving inductor L202 is made of manganese zinc, and during winding, a double-winding mode of three-layer insulated wires and copper wires is adopted.
In the embodiment of the invention, the effect of pushing the full bridge by the half bridge can be realized by arranging two inductors on the secondary winding of the driving transformer 10, so that one MOS (metal oxide semiconductor) tube is driven by the secondary winding of the driving transformer 10 and one inductor is driven at the same time, and compared with the traditional structure of pushing the full bridge by the half bridge, the invention reduces two windings of the driving transformer 10 and greatly reduces the volume of the driving transformer 10. Moreover, two annular driving inductors are adopted at the periphery to replace two windings of the traditional driving transformer 10, so that not only can flexible wiring be realized, but also the EMC can be effectively improved, and meanwhile, the effect of pushing a full bridge by a half bridge can be achieved.
In addition, compared with the conventional method of winding four windings around one driving transformer 10, the magnetic induction intensity of the innermost layer is stronger than that of the outermost layer, so that the magnetic flux balance capability is poor, and even the MOS transistor is damaged due to direct connection. However, the circuit of the embodiment of the present invention, that is, a dc blocking capacitor is connected in series between each secondary winding of the driving transformer 10 and the driving inductor, so that the problem of flux balance can be well solved.
Referring to fig. 3, a schematic circuit diagram of a preferred embodiment of the present invention is provided.
As shown in fig. 3, GATE _ a and GATE _ B are signals output by the half-bridge IC, wherein GATE _ a and GATE _ B are complementary level signals output by the half-bridge IC, and are 180 degrees out of phase.
The first boost circuit 501 includes: a transistor Q201, a transistor Q202, a diode D202, and a diode D203. The second boost circuit 502 includes: transistor Q203, transistor Q204, diode D204, and diode D201. The drive transformer 10 is T1. The first enhancement circuit 501 and the second enhancement circuit 502 are made up of a totem pole by an NPN tube and a PNP tube, so as to enhance the driving capability.
The first drive circuit 20 includes: a first driving capacitor C203 and a first driving inductor L201, wherein the first driving inductor L201 comprises a first winding L201-A and a second winding L201-B. The second drive circuit 30 includes: a second drive capacitor C204 and a second drive inductor L202, wherein the second drive inductor L202 includes a first winding L202-a and a second winding L202-B.
The first auxiliary circuit 401 includes: the circuit comprises a diode D207, a resistor R211, a resistor R214, a resistor R209, a triode Q209, a capacitor C206 and a resistor R216. The second auxiliary circuit 402 includes: diode D208, resistor R212, resistor R213, resistor R208, capacitor C205, and resistor R215. The third auxiliary circuit 403 includes: diode D210, resistor R223, resistor R233, resistor R226, resistor R219, transistor Q212, and capacitor C210. The fourth auxiliary circuit 404 includes: diode D211, resistance R222, resistance R225, resistance R218, triode Q213, capacitor C211 and resistance R227.
The first main MOS 405 is Q210, the second main MOS 406 is Q211, the third main MOS 407 is Q214, and the fourth main MOS 408 is Q215.
As shown in fig. 3, the base of the transistor Q201 and the base of the transistor Q202 are shorted and then connected to the first output terminal of the half-bridge IC together to receive the GATE _ a signal, and are also connected to ground through the resistor R201 together; the collector of the triode Q201 is connected with a power supply voltage (15V), the emitter of the triode Q201 is connected with the emitter of the triode Q202, and the collector of the triode Q202 is connected with the anode of the diode D203 and connected to the ground; the cathode of the diode D203 is connected with the anode of the diode D202, the connection end of the cathode of the diode D203 and the anode of the diode D is also connected with the connection end of the emitter of the triode Q201 and the emitter of the triode Q202, and the connection end of the anode of the diode D202 and the cathode of the diode D203 is used as the output end of the first enhancement circuit 501 and is connected with the end (pin 3 of T1) with the same name of the primary winding of the driving transformer 10; the anode of the diode D201 is connected to the supply voltage.
The base electrode of the triode Q203 and the base electrode of the triode Q204 are connected to the second output end of the half-bridge IC together after being in short circuit so as to receive the GATE _ B signal, and are grounded together through a resistor R202; the collector of the triode Q203 is connected with a power supply voltage (15V), the emitter of the triode Q203 is connected with the emitter of the triode Q204, and the collector of the triode Q204 is connected with the anode of the diode D201 and connected to the ground; the cathode of the diode D201 is connected to the anode of the diode D204, and the connection end of the two is further connected to the connection end of the emitter of the transistor Q203 and the emitter of the transistor Q2044, and the connection end of the anode of the diode D204 and the cathode of the diode D203 is used as the output end of the second enhancement circuit 502 and is connected to the synonym end (pin 4 of T1) of the primary winding of the driving transformer 10; the anode of the diode D204 is connected to the supply voltage.
The dotted terminal (pin 10 of T1) of the first secondary winding of the driving transformer 10 is connected to the first terminal of the first driving capacitor C203, the second terminal of the first driving capacitor C203 is connected to the dotted terminal of the first winding L201-a of the first driving inductor, the dotted terminal of the first winding L201-a is connected to the dotted terminal (pin 9 of T1) of the first secondary winding of the driving transformer 10 and is also connected to the first input terminal (a in fig. 3) of the primary winding of the main transformer, and the dotted terminal of the first secondary winding of the driving transformer 10 is connected to the connection terminal of the anode of the diode D207 and the first terminal of the resistor R209 (the connection terminal of the anode of the diode D207 and the first terminal of the resistor R209 is the input terminal of the first auxiliary circuit 401).
The cathode of the diode D207 is connected to the gate of the first main MOS 405(Q210) through the resistor R211, the second end of the resistor R209 is connected to the base of the transistor Q209, the emitter of the transistor Q209 is connected to the gate of the first main MOS 405(Q210), the collector of the transistor Q209 is connected to the first input end of the primary winding of the main transformer, the gate of the first main MOS 405(Q210) is further connected to a through the resistor R214 and the capacitor C206 in sequence, the resistor R216 short-circuits the gate and the source of the first main MOS 405(Q210), the source of the first main MOS 405(Q210) is connected to a, and the drain of the first main MOS 405(Q210) is connected to the drain of the third main MOS 407(Q214) and outputs a PFC voltage (PFC-OUT in the figure). The second end of the resistor R211, the emitter of the transistor Q209, the connection ends of the resistor R214 and the resistor R216 are output ends of the first auxiliary circuit 401.
The synonym terminal (pin 7 of T1) of the second secondary winding of the driving transformer 10 is connected to the first terminal of the second driving capacitor C204, the second terminal of the second driving capacitor C204 is connected to the dotted terminal of the second winding L202-a of the second driving inductor, the synonym terminal of the first winding L202-a is connected to the dotted terminal (pin 6 of T1) of the second secondary winding of the driving transformer 10 and is also connected to the second input terminal (B in fig. 3) of the primary winding of the main transformer, and the synonym terminal of the second secondary winding of the driving transformer 10 is connected to the connection terminal of the anode of the diode D210 and the first terminal of the resistor R219 (the connection terminal of the anode of the diode D210 and the first terminal of the resistor R219 is the input terminal of the third auxiliary circuit 403).
The dotted terminal of the second winding L202-B is connected to the connection terminal between the anode of the diode D208 and the first terminal of the resistor R208 (the connection terminal between the anode of the diode D208 and the first terminal of the resistor R208 is the input terminal of the second auxiliary circuit 402), the anode of the diode D208 is connected to the first terminal of the resistor R212, and the second terminal of the resistor R212 is connected to the gate of the second main MOS transistor 406 (Q211). The second end of the resistor R208 is connected with the base electrode of the triode Q207, the emitter electrode of the triode Q207 is connected with the second end of the resistor R212, and the collector electrode of the triode Q207 and the synonym end of the second winding L202-B are grounded together; the gate of the second main MOS transistor 406(Q211) is grounded through the resistor R213 and the capacitor C205 in sequence, the resistor R215 short-circuits the gate and the source of the second main MOS transistor 406(Q211), the drain of the second main MOS transistor 406(Q211) is connected to a, and the source of the second main MOS transistor 406(Q211) is grounded. The second terminal of the resistor R212, the emitter of the transistor Q207, the connection terminals of the resistor R213 and the resistor R215 are output terminals of the second auxiliary circuit 402.
The cathode of the diode D210 is connected to the first end of the resistor R223, the second end of the resistor R223 is connected to the gate of the third main MOS transistor 407(Q214), the base of the transistor Q212 is connected to the second end of the resistor R219, the collector of the transistor Q212 is connected to B, the gate of the third main MOS transistor 407(Q214) is connected to B sequentially through the resistor R233 and the resistor C210, and the resistor R226 short-circuits the gate and the source of the third main MOS transistor 407 (Q214); the source of the third main MOS transistor 407(Q214) is connected to B. The connection end of the resistor R223, the emitter of the transistor Q212, the resistor R233 and the resistor R226 is the output end of the third auxiliary circuit 403.
The dotted terminal of the second winding L201-B is connected to the connection terminal between the anode of the diode D211 and the first terminal of the resistor R218 (the connection terminal between the anode of the diode D211 and the first terminal of the resistor R218 is the input terminal of the fourth auxiliary circuit 404), the dotted terminal of the second winding L201-B and the collector of the transistor Q213 are grounded, and the cathode of the diode D211 is connected to the gate of the fourth main MOS transistor 408(Q215) through the resistor R222; the emitter of the transistor Q213 is connected to the gate of the fourth main MOS transistor 408 (Q215). The gate of the fourth main MOS 408(Q215) is further grounded through the capacitor C211 and the R225 in sequence, the resistor R227 short-circuits the gate and the source of the fourth main MOS 408(Q215), the source of the fourth main MOS 408(Q215) is grounded, and the drain of the fourth main MOS 408(Q215) is connected to B. The connection end of the resistor R222, the emitter of the transistor Q213, the resistor R225, and the resistor R227 is the output end of the fourth auxiliary circuit 404.
As shown in fig. 3, the operation principle of the circuit based on the half-bridge IC driving the full bridge according to the embodiment of the present invention is as follows:
when GATA _ a is high:
the working current of the driving transformer 10 is divided into two parts according to the electromagnetic induction principle from top to bottom: the first loop is: the signal sequentially flows into a first input end (A) of a primary winding of the main transformer from a pin 10 of the T1, a diode D207, a resistor R211 and a first main MOS tube 405 (Q210). The second loop is as follows: the signal sequentially flows into a first input end of a primary winding of the main transformer from a pin 10 of the T1, a first driving capacitor C203 and a first winding L201-A of a first driving inductor. When the second loop works (the first winding L201-A is magnetized), the second winding L201-B of the first driving inductor generates current according to the electromagnetic induction principle, and the current loop is as follows: the current flows into the ground through the second winding L201-B, the diode D211, the resistor R222 and the fourth main MOS tube 408(Q215) in sequence. Therefore, when GATA _ a is at a high level, the first main MOS transistor 405(Q210) and the fourth main MOS transistor 408(Q215) are turned on, so that two MOS transistors which are not connected to the common ground are driven to be turned on by one transistor.
When GATE _ B is high:
the working current of the driving transformer 10 is divided into two parts according to the electromagnetic induction principle from bottom to top: the first loop is: the current flows into the second input end (B) of the primary winding of the main transformer through the pin 7 of the T1, the diode D210, the resistor R223 and the third main MOS tube 407(Q214) in sequence. The second loop is as follows: and then flows into the second input end of the primary winding of the main transformer through a pin 7 of the T1, a second driving capacitor C204 and a first winding L202-A of a second driving inductor. When the second loop works (the first winding L202-A is magnetized), the second winding L202-B of the second driving inductor generates current according to the electromagnetic induction principle, and the current loop is as follows: the current flows into the ground through the second winding L202-B, the diode D208, the resistor R212 and the second main MOS tube 406(Q211) in sequence. Therefore, when GATA _ B is at a high level, the second main MOS transistor 406(Q211) and the third main MOS transistor 407(Q214) are turned on, and two MOS transistors not connected to the ground are turned on by one drive.
According to the working principle, the half-bridge push-full bridge can be realized by matching one driving transformer 10 with two driving inductors (the first driving inductor L201 and the second driving inductor L202), one main MOS (metal oxide semiconductor) tube is driven on the secondary side of the driving transformer 10, and one inductor is driven at the same time, so that two windings of the driving transformer 10 are reduced compared with the traditional half-bridge push-full bridge, the size of the driving transformer 10 is greatly reduced, the periphery can be replaced by only using two annular driving inductors, and the mode can be used for flexibly wiring and effectively improving EMC (electro magnetic compatibility). Compared with the traditional method that four windings are wound on one driving transformer 10, the magnetic induction intensity of the innermost layer is stronger than that of the outermost layer, so that the magnetic flux balance capability is poor, and even the MOS transistor is damaged due to direct connection. However, the circuit of the embodiment of the present invention, that is, a dc blocking capacitor is connected in series between each secondary winding of the driving transformer 10 and the driving inductor, so that the problem of flux balance can be well solved.
The invention also discloses a driving power supply which comprises the circuit based on the half-bridge IC driving full bridge disclosed by the embodiment of the invention. Optionally, the driving power source of the embodiment of the present invention includes, but is not limited to, a driving power source of a lighting device and an industrial electrical device, such as an LED driving power source.
Further, this drive power supply through setting up this circuit based on half-bridge IC drive full-bridge, when effectively reducing the volume of drive transformer 10 in the drive power supply, can reach the half-bridge and push away the effect of full-bridge, further reduce drive power supply's volume, can also effectively improve drive power supply's EMC simultaneously. In addition, the magnetic flux balance of the driving power supply is good, and an MOS (metal oxide semiconductor) tube in the driving power supply can be effectively protected.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (6)

1. A circuit based on a half-bridge IC driving a full bridge, comprising: the driving circuit comprises a driving transformer, a first driving circuit, a second driving circuit and a full-bridge circuit;
the primary winding of the driving transformer is connected with the half-bridge IC, the first secondary winding of the driving transformer is connected with the input end of the first driving circuit, and the second secondary winding of the driving transformer is connected with the input end of the second driving circuit; the first output end of the first driving circuit is connected with the full-bridge circuit, the second output end of the first driving circuit is connected with the first input end of the primary winding of the main transformer, the first output end of the second driving circuit is connected with the full-bridge circuit, and the second output end of the second driving circuit is connected with the second input end of the primary winding of the main transformer;
the first driving circuit and the second driving circuit drive the full-bridge circuit to be conducted according to signals output by a first secondary winding and a second secondary winding of the driving transformer respectively so as to output driving signals to the main transformer;
the full-bridge circuit includes: the MOS transistor comprises a first main MOS transistor, a second main MOS transistor, a third main MOS transistor, a fourth main MOS transistor, a first auxiliary circuit, a second auxiliary circuit, a third auxiliary circuit and a fourth auxiliary circuit;
the input end of the first auxiliary circuit is connected with the first output end of the first driving circuit, the output end of the first auxiliary circuit is connected with the grid electrode of the first main MOS tube, and the second output end of the first driving circuit is connected with the first input end of the primary winding of the main transformer; the input end of the second auxiliary circuit is connected with the third output end of the second driving circuit, the output end of the second auxiliary circuit is connected with the grid electrode of the second main MOS tube, and the second output end of the second driving circuit is connected with the second input end of the primary winding of the main transformer;
the input end of the third auxiliary circuit is connected with the first output end of the second driving circuit, and the output end of the third auxiliary circuit is connected with the grid electrode of the third main MOS tube; the input end of the fourth auxiliary circuit is connected with the third output end of the first driving circuit, and the output end of the fourth auxiliary circuit is connected with the grid electrode of the fourth main MOS tube;
the output end of the first driving circuit comprises a first output end, a second output end and a third output end, and the output end of the second driving circuit comprises a first output end, a second output end and a third output end;
the first drive circuit includes: a first drive capacitor and a first drive inductor;
the first end of the first driving capacitor is connected with the homonymous end of the first secondary winding of the driving transformer, the second end of the first driving capacitor is connected with the homonymous end of the first winding of the first driving inductor, and the heteronymous end of the first winding of the first driving inductor is connected with the heteronymous end of the first secondary winding of the driving transformer; the synonym end of the first secondary winding of the driving transformer is connected with the first input end of the primary winding of the main transformer, and the synonym end of the first winding of the first driving inductor is also connected with the first input end of the primary winding of the main transformer; the homonymous end of the second winding of the first driving inductor is connected with the input end of the fourth auxiliary circuit, and the heteronymous end of the second winding of the first driving inductor is grounded;
the dotted terminal of the first secondary winding of the driving transformer is a first output terminal of the first driving circuit, the synonym terminal of the first winding of the first driving inductor is a second output terminal of the first driving circuit, and the dotted terminal of the second winding of the first driving inductor is a third output terminal of the first driving circuit;
the second drive circuit includes: a second drive capacitor and a second drive inductor;
the first end of the second driving capacitor is connected with the synonym end of the second secondary winding of the driving transformer, the second end of the second driving capacitor is connected with the synonym end of the first winding of the second driving inductor, and the synonym end of the first winding of the second driving inductor is connected with the synonym end of the second secondary winding of the driving transformer; the synonym end of the second secondary winding of the driving transformer is connected with the input end of the third auxiliary circuit, the synonym end of the first winding of the second driving inductor is connected with the second input end of the primary winding of the main transformer, the synonym end of the second winding of the second driving inductor is connected with the input end of the second auxiliary circuit, and the synonym end of the second winding of the second driving inductor is grounded;
the synonym end of the second secondary winding of the driving transformer is a first output end of the second driving circuit, the synonym end of the first winding of the second driving inductor is a second output end of the second driving circuit, and the synonym end of the second winding of the second driving inductor is a third output end of the second driving circuit;
the first winding and the second winding of the first driving inductor are coupling windings; the first winding and the second winding of the second driving inductor are coupling windings.
2. The half-bridge IC driven full-bridge based circuit of claim 1, further comprising: the signal enhancement circuit is arranged between the primary winding of the driving transformer and the half-bridge IC;
and the signal enhancement circuit receives the signal output by the half-bridge IC, enhances the received signal and then sends the signal to the primary winding of the driving transformer.
3. The half-bridge IC driven full-bridge based circuit of claim 2, wherein the signal enhancement circuit comprises: a first boost circuit and a second boost circuit;
the input end of the first enhancement circuit is connected with the first output end of the half-bridge IC, and the output end of the first enhancement circuit is connected with the dotted end of the primary winding of the driving transformer;
the input end of the second enhancement circuit is connected with the second output end of the half-bridge IC, and the output end of the second enhancement circuit is connected with the synonym end of the primary winding of the driving transformer.
4. The half-bridge IC driven full-bridge based circuit according to claim 1, wherein the first driving inductor is made of Mn-Zn material, and the number of turns of the first winding and the second winding of the first driving inductor is 1: 1.
5. the half-bridge IC driven full-bridge based circuit according to claim 1, wherein the second driving inductor is made of Mn-Zn material, and the number of turns of the first winding and the second winding of the second driving inductor is 1: 1.
6. a driving power supply, comprising the circuit of any one of claims 1 to 5 based on a half-bridge IC driven full bridge.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0942520A2 (en) * 1998-03-09 1999-09-15 Magnetic Technology, Inc. DC to DC power converter
CN203261132U (en) * 2013-05-07 2013-10-30 南京邮电大学 Wireless power supply device employing fundamental wave magnetic coupling resonance
CN207200579U (en) * 2017-09-15 2018-04-06 肇庆市锐高电子有限公司 Full-bridge switching power supply

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0942520A2 (en) * 1998-03-09 1999-09-15 Magnetic Technology, Inc. DC to DC power converter
CN203261132U (en) * 2013-05-07 2013-10-30 南京邮电大学 Wireless power supply device employing fundamental wave magnetic coupling resonance
CN207200579U (en) * 2017-09-15 2018-04-06 肇庆市锐高电子有限公司 Full-bridge switching power supply

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