CN113162438A - Power supply conversion circuit - Google Patents
Power supply conversion circuit Download PDFInfo
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- CN113162438A CN113162438A CN202110473459.3A CN202110473459A CN113162438A CN 113162438 A CN113162438 A CN 113162438A CN 202110473459 A CN202110473459 A CN 202110473459A CN 113162438 A CN113162438 A CN 113162438A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 48
- 230000001360 synchronised effect Effects 0.000 claims abstract description 61
- 230000005669 field effect Effects 0.000 claims description 55
- 238000004804 winding Methods 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 32
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 230000036039 immunity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/22—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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
一种电源转换电路，包括：整流滤波电路，用于将输入电源输入的交流电转换为直流电由第一输出端、第二输出端输出；控制电路，其输入端与整流滤波电路的第二输出端连接，其内置有谐振控制模块；LLC谐振半桥电路，其工作电压端与整流滤波电路的第一输出端连接，控制电压端与控制电路的输出端连接；LLC谐振半桥电路和控制电路共同用于对直流电进行电压转换；输出同步整流电路，其输入端与LLC谐振半桥电路的输出端连接，输出端用于连接外部负载。本发明实施例不再需要采用AC升压稳压直流电路等辅助电路，减少了能量传递的环节，提高了能源转换效率，同时，也简化整个电源转换电源的电路结构，使得灯箱电源产品的体积得到了有效的减小。
A power conversion circuit, comprising: a rectification filter circuit, which is used to convert alternating current input from an input power supply into direct current and output by a first output end and a second output end; a control circuit, whose input end is connected to the second output end of the rectification filter circuit connection, it has a built-in resonance control module; LLC resonant half-bridge circuit, whose working voltage terminal is connected to the first output terminal of the rectifier and filter circuit, and the control voltage terminal is connected to the output terminal of the control circuit; the LLC resonant half-bridge circuit and the control circuit share the same It is used for voltage conversion of direct current; it outputs a synchronous rectifier circuit, the input end of which is connected to the output end of the LLC resonant half-bridge circuit, and the output end is used to connect an external load. The embodiment of the present invention no longer needs to use auxiliary circuits such as AC boosting and stabilizing DC circuits, reduces energy transfer links, improves energy conversion efficiency, and at the same time simplifies the circuit structure of the entire power conversion power supply, reducing the volume of light box power products. has been effectively reduced.
Description
Technical Field
The invention belongs to the field of power supplies, and particularly relates to a power supply conversion circuit.
Background
Along with the development of social economy, people's life is becoming more and more abundant, and lamps and lanterns also become more and more important as the product that is difficult to avoid using in people's daily life, amusement and leisure, and its kind and form are also more and more. The power supply circuit is difficult to avoid in the use process of all lamps. The structure of the traditional power conversion circuit is complex, and auxiliary circuits such as an AC voltage boosting and stabilizing direct current circuit need to be used for assistance, so that the energy conversion efficiency of a lamp box power supply product using the power conversion circuit is low, the whole size is large, and the failure rate is increased because the circuit structure of the power conversion circuit is more complex.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power supply conversion circuit which solves the problems of low energy conversion efficiency, large overall size and high failure rate of a lamp box power supply product.
The power conversion circuit according to the embodiment of the invention comprises:
the rectifier filter circuit is provided with a first output end and a second output end, and the input end of the rectifier filter circuit is connected with an input power supply and converts alternating current input by the input power supply into direct current to be output by the first output end and the second output end;
the input end of the control circuit is connected with the second output end of the rectification filter circuit, and a resonance control module is arranged in the control circuit;
the LLC resonance half-bridge circuit is provided with a working voltage end, a control voltage end, an output end and a grounding end, wherein the working voltage end is connected with the first output end of the rectification filter circuit, and the control voltage end is connected with the output end of the control circuit; the LLC resonance half-bridge circuit and the control circuit are jointly used for carrying out voltage conversion on the direct current;
and the input end of the output synchronous rectification circuit is connected with the output end of the LLC resonant half-bridge circuit, and the output end of the output synchronous rectification circuit is used for connecting an external load.
The power conversion circuit according to the embodiment of the invention has at least the following technical effects: the alternating current input by the input power supply can be rectified and filtered through the rectifying and filtering circuit, further conversion can be completed on the direct current input by the rectifying and filtering circuit through the control circuit and the LLC resonant half-bridge circuit, and finally the power supply meeting the use requirement of an external load is output through the output synchronous rectifying circuit. According to the power conversion circuit, the LLC resonance half-bridge circuit and the resonance control module in the control circuit are adopted, so that auxiliary circuits such as an AC voltage boosting and stabilizing direct current circuit are not needed, links of energy transfer are reduced, the energy conversion efficiency is improved, meanwhile, the circuit structure of the whole power conversion power supply is simplified, and the size of a light box power supply product is effectively reduced; in addition, the simplification of circuit structure has also further reduced the appearance of fault rate, and is convenient for carry out quick detection and maintenance more.
According to some embodiments of the invention, the rectifying-filtering circuit comprises:
the input end of the bridge rectifier unit is connected with the input power supply;
and the input end of the filtering unit is connected with the output end of the bridge type rectifying unit, and the two output ends are respectively used as a first output end and a second output end of the rectifying and filtering circuit.
According to some embodiments of the invention, the LLC resonant half-bridge circuit comprises:
the drain electrode of the first field effect transistor is connected with the first output end of the rectification filter circuit;
the drain electrode of the second field effect tube is connected with the source electrode of the first field effect tube, and the source electrode is connected with the ground wire; the grid and the source of the first field effect transistor and the grid of the second field effect transistor are respectively connected with the output end of the control circuit;
the first inductor, the first capacitor and a primary winding of the transformer form a series structure, and the series structure is connected between a drain electrode and a source electrode of the second field effect transistor; and the secondary winding of the transformer is connected with the input end of the output synchronous rectification circuit.
According to some embodiments of the invention, the secondary winding of the transformer is provided with a center tap, and the output synchronous rectification circuit comprises:
the drain electrode of the third field effect transistor is connected with the output end of the first winding of the transformer;
a drain electrode of the fourth field effect transistor is connected with the output end of the second winding of the transformer, and a source electrode of the fourth field effect transistor is connected with a source electrode of the third field effect transistor; the source electrode of the fourth field effect transistor and the middle tap of the transformer are used for connecting the external load;
the first synchronous rectification module is provided with an output end, a grounding end and a detection end, wherein the output end of the first synchronous rectification module is connected with the grid electrode of the third field effect transistor, the grounding end is connected with the source electrode of the third field effect transistor, and the detection end is connected with the output end of the first winding of the transformer;
and the second synchronous rectification module is provided with an output end, a grounding end and a detection end, wherein the output end of the second synchronous rectification module is connected with the grid electrode of the fourth field effect transistor, the grounding end is connected with the source electrode of the fourth field effect transistor, and the detection end is connected with the output end of the second winding of the transformer.
According to some embodiments of the invention, the control circuit comprises the resonance control module; the resonance control module is provided with a starting power supply input end, an upper pipe drive end, a lower pipe drive end and a half-bridge connecting end, wherein the starting power supply input end is connected with the second output end of the rectification filter circuit, the upper pipe drive end, the lower pipe drive end and the half-bridge connecting end are respectively connected with the LLC resonance half-bridge circuit, and the resonance control module is used for controlling the LLC resonance half-bridge circuit to perform voltage conversion.
According to some embodiments of the invention, the control circuit further comprises a first voltage dividing circuit connected between the first output terminal of the rectifying and filtering circuit and a ground line, and an output terminal of the first voltage dividing circuit is connected to the bus voltage detection terminal of the resonance control module.
According to some embodiments of the present invention, the power conversion circuit further includes an EMI interference rejection circuit connected between the input power and the rectifying and filtering circuit, and the EMI interference rejection circuit is configured to filter out common mode interference and differential mode interference in the alternating current.
According to some embodiments of the invention, the EMI immunity circuitry comprises:
the second capacitor is connected between the zero line and the live line of the input power supply;
two input ends of the first common mode inductor are respectively connected with a zero line and a live line of the input power supply;
the third capacitor is connected between the two output ends of the first common-mode inductor;
and two input ends of the second common-mode inductor are respectively connected to two ends of the third capacitor, and two output ends of the second common-mode inductor are used for being connected with the rectifying and filtering circuit.
According to some embodiments of the present invention, the power conversion circuit further includes a voltage-current feedback circuit, an input terminal of the voltage-current feedback circuit is connected to an output terminal of the output synchronous rectification circuit, and an output terminal of the voltage-current feedback circuit is connected to a feedback input terminal of the control circuit, so as to adjust an output state of the output synchronous rectification circuit through the control circuit.
According to some embodiments of the invention, the voltage-current feedback circuit comprises:
the current detection resistor is connected with the output end of the output synchronous rectification circuit in series;
the second voltage division circuit is used for collecting the voltage at the output end of the output synchronous rectification circuit;
the first comparison unit is provided with two current input ends which are respectively connected with two ends of the current detection resistor, a voltage input end which is connected with the output end of the second voltage division circuit, a working voltage end and a feedback output end;
and the positive electrode of the input end of the optical coupling unit is connected with the working voltage end of the first comparison unit, the negative electrode of the input end of the optical coupling unit is connected with the output end of the first comparison unit, and the output end of the optical coupling unit is connected between the feedback input end of the control circuit and the ground wire.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit schematic of a power conversion circuit of an embodiment of the present invention;
FIG. 2 is a circuit schematic of a rectifying-filtering circuit and an EMI immunity circuit of an embodiment of the present invention;
FIG. 3 is a circuit schematic of the control circuit of an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an LLC resonant half-bridge circuit of an embodiment of the invention;
fig. 5 is a circuit schematic diagram of an output synchronous rectification circuit and a voltage-current feedback circuit of an embodiment of the present invention.
Reference numerals:
a rectifying and filtering circuit 100, a bridge rectifying unit 110, a filtering unit 120,
A control circuit 200, a first voltage dividing circuit 210,
LLC resonant half-bridge circuit 300,
An output synchronous rectification circuit 400,
An EMI anti-interference circuit 500,
A voltage-current feedback circuit 600, and a second voltage divider circuit 610.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A power conversion circuit according to an embodiment of the present invention is described below with reference to fig. 1 to 5.
The power conversion circuit according to the embodiment of the invention comprises a rectifying and filtering circuit 100, a control circuit 200, an LLC resonant half-bridge circuit 300 and an output synchronous rectifying circuit 400.
The rectifier filter circuit 100 has a first output end and a second output end, and an input end of the rectifier filter circuit is connected with an input power supply and converts alternating current input by the input power supply into direct current to be output by the first output end and the second output end;
the input end of the control circuit 200 is connected with the second output end of the rectifying and filtering circuit 100, and a resonance control module U1 is arranged in the control circuit;
an LLC resonant half-bridge circuit 300 having a working voltage terminal, a control voltage terminal, an output terminal, and a ground terminal, wherein the working voltage terminal is connected to the first output terminal of the rectifying and filtering circuit 100, and the control voltage terminal is connected to the output terminal of the control circuit 200; the LLC resonant half-bridge circuit 300 and the control circuit 200 are used together for voltage conversion of dc power;
and an input end of the output synchronous rectification circuit 400 is connected with an output end of the LLC resonant half-bridge circuit 300, and an output end is used for connecting an external load.
Referring to fig. 1 to 5, the live line and the neutral line of the input power are respectively connected to two ends of the ac output terminal of the rectifying and filtering circuit 100, and the rectifying and filtering circuit 100 converts the ac input by the input power into dc and outputs the dc. The first output terminal of the rectifying-filtering circuit 100 is directly used as the operating voltage of the LLC resonant half-bridge circuit 300, and the second output terminal is output to the input terminal in the control circuit 200, and is used as the high-voltage starting input power source of the resonant control module U1 in the control circuit 200. Then, the LLC resonant half-bridge circuit 300 starts further voltage conversion under the control of the output end of the control circuit 200, and transmits the converted voltage to the output synchronous rectification circuit 400 for final synchronous rectification, and finally outputs the power required by the external load.
According to the power conversion circuit of the embodiment of the invention, the alternating current input by the input power can be rectified and filtered through the rectifying and filtering circuit 100, further the direct current input by the rectifying and filtering circuit 100 can be further converted through the control circuit 200 and the LLC resonant half-bridge circuit 300, and finally the power meeting the use requirement of an external load is output through the output synchronous rectifying circuit 400. According to the power conversion circuit, by adopting the LLC resonance half-bridge circuit 300 and the resonance control module U1 in the control circuit 200, auxiliary circuits such as an AC voltage boosting and stabilizing direct current circuit are not needed, so that the links of energy transfer are reduced, the energy conversion efficiency is improved, meanwhile, the circuit structure of the whole power conversion power supply is simplified, and the volume of a light box power supply product is effectively reduced; in addition, the simplification of circuit structure has also further reduced the appearance of fault rate, and is convenient for carry out quick detection and maintenance more.
In some embodiments of the present invention, a diode D4 and a resistor R2 are connected in series between the second output terminal of the rectifying-filtering circuit 100 and the input terminal of the control circuit 200, so as to provide effective protection for the rectifying-filtering circuit 100 and the resonance control module U1.
In some embodiments of the present invention, the rectifying-filtering circuit 100 includes: bridge rectifier unit 110, filter unit 120. A bridge rectifier unit 110 having an input terminal connected to an input power; and a filter unit 120, an input end of which is connected to the output end of the bridge rectifier unit 110, and two output ends of which are respectively used as a first output end and a second output end of the rectification filter circuit 100. The bridge rectifier unit 110, that is, a bridge rectifier circuit composed of diodes D1, D2, D5 and D7, can directly and effectively convert the ac power input by the input power into dc power. Furthermore, the output direct current can be filtered through the filtering unit 120, so that the quality of the output direct current is ensured. The filtering unit 120 may be connected in parallel between the positive and negative terminals of the output terminal of the bridge rectifying unit 110 by using capacitors C20 and C21.
In some embodiments of the present invention, the LLC resonant half-bridge circuit 300 comprises: the inductor comprises a first field effect transistor Q6, a second field effect transistor Q5, a first inductor L7, a first capacitor C14 and a transformer T1. A first field effect transistor Q6, the drain of which is connected to the first output terminal of the rectifying-filtering circuit 100; the drain electrode of the second field effect transistor Q5 is connected with the source electrode of the first field effect transistor Q6, and the source electrode is connected with the ground wire; the grid and the source of the first field effect transistor Q6 and the grid of the second field effect transistor are respectively connected with the output end of the control circuit 200; the first inductor L7, the first capacitor C14, the transformer T1, the first inductor L7, the first capacitor C14 and a primary winding of the transformer T1 form a series structure, and the series structure is connected between a drain electrode and a source electrode of the second field effect transistor Q5; the secondary winding of the transformer T1 is connected to the input terminal of the output synchronous rectification circuit 400. Referring to fig. 2 to 5, the gate voltage of the first fet Q6 is controlled by the upper tube driving end of the resonant control module U1, the gate voltage of the second fet Q5 is controlled by the lower tube driving end of the resonant control module U1, and the connection ends of the first fet Q6 and the second fet Q5 are connected to the half-bridge connection end of the control power supply, so that when the working voltage of the whole LLC resonant half-bridge circuit 300 is normal, that is, when the output voltage of the first output end of the rectifying and filtering circuit 100 is normal, only the control circuit 200 needs to make the first fet Q6 and the second fet Q5 be in the on state at the same time, the primary winding of the transformer T1 is energized, and further, the energy is transferred to the output synchronous rectifying circuit 400 through the secondary winding. Therefore, the voltage conversion and the energy transfer can be realized by controlling the power supply to control the on and off of the first field effect transistor Q6 and the second field effect transistor Q5.
In some embodiments of the present invention, the secondary winding of the transformer T1 is provided with a center tap, and the output synchronous rectification circuit 400 includes: the synchronous rectification circuit comprises a third field effect transistor Q1, a fourth field effect transistor Q3, a first synchronous rectification module U2 and a second synchronous rectification module U3. A third field effect transistor Q1, the drain of which is connected with the first winding output end A of the transformer T1; a fourth field effect transistor Q3, the drain of which is connected with the second winding output terminal B of the transformer T1, and the source of which is connected with the source of the third field effect transistor Q1; the source electrode of the fourth field effect transistor Q3 and the middle tap of the transformer T1 are used for connecting an external load; the first synchronous rectification module U2 is provided with an output end, a grounding end and a detection end, wherein the output end is connected with the grid electrode of the third field effect transistor Q1, the grounding end is connected with the source electrode of the third field effect transistor Q1, and the detection end is connected with the output end of the first winding of the transformer T1; the second synchronous rectification module U3 has an output terminal, a ground terminal, and a detection terminal, wherein the output terminal is connected to the gate of the fourth fet Q3, the ground terminal is connected to the source of the fourth fet Q3, and the detection terminal is connected to the output terminal of the second winding of the transformer T1. Referring to fig. 4 and 5, the center tap C of the secondary winding of the transformer T1 and the first winding output terminal a form an output winding, and the center tap C and the second winding output terminal B form an output winding. The middle tap C and the output end A of the first winding are disconnected by a third field effect transistor Q1, so that whether the first winding of the transformer T1 is output or not can be controlled by the third field effect transistor Q1, the grid electrode of the third field effect transistor Q1 is connected with the output end DVR of the first synchronous rectification module U2, and the connection and disconnection of the third field effect transistor Q1 can be controlled by the first synchronous rectification module U2; similarly, the center tap C and the second winding output end B are disconnected by the fourth fet Q3, and then whether the second winding of the transformer T1 is output can be controlled by the fourth fet Q3, and the gate of the fourth fet Q3 is connected to the output end DVR of the second synchronous rectification module U3, so that the fourth fet Q3 can be controlled to be switched on and off by the second synchronous rectification module U3. Finally, synchronous rectification is realized through the third field effect transistor Q1, the fourth field effect transistor Q3, the first synchronous rectification module U2 and the second synchronous rectification module U3. In addition, polar capacitors C38, C39 and C40 are connected between the output end branch formed by the sources of the first synchronous rectification module U2 and the second synchronous rectification module U3 and the middle tap C of the transformer T1, so that the power output by synchronous rectification is more stable. In some embodiments of the present invention, the first synchronous rectification module U2 and the second synchronous rectification module U3 both employ a synchronous rectification control chip NCP 4306.
In some embodiments of the present invention, an operation indication unit is further connected to the output end of the output synchronous rectification circuit 400. Referring to fig. 5, the operation indicating unit is used to indicate the operating state of the output synchronous rectification circuit 400. In some embodiments of the present invention, the operation indication unit includes a resistor R44 and a light emitting diode LED1 connected in series between two lines at the output terminal of the output synchronous rectification circuit 400. The light indication is achieved by a light emitting diode LED 1.
In some embodiments of the present invention, referring to fig. 2-4, the control circuit 200 includes a resonance control module U1; the resonant control module U1 has a start power INPUT end HV-INPUT, an upper tube driving end MUPPER, a lower tube driving end MLOWER and a half-bridge connecting end HB, wherein the start power INPUT end is connected with the second output end of the rectifying and filtering circuit 100, the upper tube driving end, the lower tube driving end and the half-bridge connecting end are respectively connected with the LLC resonant half-bridge circuit 300, and the resonant control module is used for controlling the LLC resonant half-bridge circuit 300 to perform voltage conversion. The resonance control module U1 can control whether transformer T1 outputs by controlling the on and off of the first fet Q6 and the second fet Q5, and then can make the LLC resonance half-bridge circuit 300 realize LLC resonance, so as to achieve the purpose of converting voltage. In some embodiments of the invention, the resonance control module U1 employs a resonance control chip NCP 13992.
In some embodiments of the present invention, referring to fig. 3, the control circuit 200 further includes a first voltage dividing circuit 210 connected between the first output terminal of the rectifying and filtering circuit 100 and the ground line, and an output terminal of the first voltage dividing circuit 210 is connected to the bus voltage detecting terminal of the resonant control module, VBULK/PFC-FB. The voltage of the positive electrode of the output end of the rectifying and filtering circuit 100 can be collected through the voltage division circuit, and therefore power failure protection can be achieved. The first voltage divider circuit 210 includes two resistors R12 and R43 connected in series.
In some embodiments of the present invention, referring to fig. 3 and 4, the operating voltage terminal of the resonance control module U1 is connected to an auxiliary power supply. The auxiliary power supply is finally connected to the overvoltage/overtemperature protection terminal OVP/OTP of the resonance control module U1 through a resistor R3, a diode D3 and a resistor R51. In some embodiments of the present invention, the transformer T1 is a multi-tap transformer, and the auxiliary power source may be directly tapped from one of the taps of the multi-tap transformer.
In some embodiments of the present invention, referring to fig. 2, the power conversion circuit further includes an EMI interference rejection circuit 500 connected between the input power and the rectifying and filtering circuit 100, wherein the EMI interference rejection circuit 500 is configured to filter out common mode interference and differential mode interference in the alternating current. The EMI immunity circuit 500 can effectively suppress common mode interference and differential mode interference in the power grid and the equipment. In some embodiments of the present invention, Y capacitors CY5 and CY1 are further connected between the two lines at the output terminal of the EMI interference rejection circuit 500 and the ground line, respectively, to further improve the filtering effect.
In some embodiments of the present invention, referring to FIG. 2, EMI immunity circuitry 500 includes: a second capacitor CX2, a first common mode inductor L3, a third capacitor CX1, and a second common mode inductor L1. The second capacitor CX2 is connected between the zero line and the live line of the input power supply; two input ends of the first common-mode inductor L3 are respectively connected with a zero line and a live line of an input power supply; a third capacitor CX1 connected between the two output terminals of the first common-mode inductor L3; two input ends of the second common mode inductor L1 are connected to two ends of the third capacitor CX1, respectively, and two output ends are used for connecting the rectifying and filtering circuit 100. The second capacitor CX2, the first common-mode inductor L3, the third capacitor CX1 and the second common-mode inductor L1 can suppress common-mode interference and differential-mode interference in the power grid equipment. In some embodiments of the present invention, a thermistor RT1 is further disposed between the first common mode inductor L3 and the third capacitor CX1 to realize temperature detection. In some embodiments of the present invention, a fuse F1 is connected between the input of the first common mode inductor L3 and the input power source.
In some embodiments of the present invention, the power conversion circuit further includes a voltage-current feedback circuit 600, an input terminal of the voltage-current feedback circuit 600 is connected to an output terminal of the output synchronous rectification circuit 400, and an output terminal of the voltage-current feedback circuit 600 is connected to a feedback input terminal of the control circuit 200, for adjusting an output state of the output synchronous rectification circuit 400 through the control circuit 200. The voltage and current feedback circuit 600 can effectively detect the power output by the output synchronous rectification circuit 400 to the load, and finally can feed back the detected power to the LLC feedback input pin LLC-FB of the resonant control module U1 in the control circuit 200, so as to realize feedback regulation of the output.
In some embodiments of the present invention, voltage-to-current feedback circuit 600 comprises: the current detection resistor R36, the second voltage division circuit 610, the first comparison unit U4 and the optical coupling unit P4 are composed of P4-A and P5-B in the figure. A current detection resistor R36 connected in series with the output end of the output synchronous rectification circuit 400; a second voltage divider 610 for collecting and outputting the voltage at the output terminal of the synchronous rectification circuit 400; a first comparing unit U4 having two current input terminals respectively connected to two ends of the current detecting resistor R36, a voltage input terminal connected to an output terminal of the second voltage dividing circuit 610, a working voltage terminal, and a feedback output terminal; and the positive electrode of the input end of the optical coupling unit P4 is connected with the working voltage end of the first comparing unit U4, the negative electrode of the input end is connected with the output end of the first comparing unit U4, and the output end of the optical coupling unit P4 is connected between the feedback input end of the control circuit 200 and the ground wire. The current output by the output synchronous rectification circuit 400 can be collected through the current detection resistor R36, and the current can be collected through the two current input ends (the 1 st pin and the 4 th pin) of the first comparing unit U4. The second voltage dividing circuit 610 may divide and collect the output voltage of the output synchronous rectification circuit 400, and finally input the voltage to the voltage input terminal (pin 3) of the first comparing unit U4. Finally, feedback output is completed through a feedback output end (a 5 th pin) of the first comparison unit U4, and a feedback signal is transmitted to the LLC-FB end of the resonance control module U1 of the control circuit 200 through the optical coupling unit P4. The operating voltage terminal (pin 6) of the first comparing unit U4 can be directly connected to the center tap C of the transformer T1 for power supply. In some embodiments of the present invention, the first comparing unit U4 employs a power control chip AP 4320.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
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| CN114257098A (en) * | 2021-12-28 | 2022-03-29 | 欧瑞传动电气股份有限公司 | Wide input voltage single-stage LLC isolation voltage stabilizing circuit |
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