CN113765402A - Wide-voltage input DC-DC converter - Google Patents
Wide-voltage input DC-DC converter Download PDFInfo
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- CN113765402A CN113765402A CN202111135727.7A CN202111135727A CN113765402A CN 113765402 A CN113765402 A CN 113765402A CN 202111135727 A CN202111135727 A CN 202111135727A CN 113765402 A CN113765402 A CN 113765402A
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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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a wide voltage input DC-DC converter, comprising: the feedback compensation circuit comprises a first-stage converter, a second-stage converter, a PWM controller, a resonance controller and a feedback compensation network; the input end of the first-stage converter is connected with the voltage input end, and the output end of the first-stage converter is connected with the input end of the second-stage converter; the second-stage converter is sequentially connected with the feedback compensation network, the PWM controller and the first-stage converter; the first stage converter is used for converting the wide input voltage of the voltage input end into an intermediate bus voltage; the second-stage converter is used for converting the intermediate bus voltage into output voltage according to a preset proportion; the feedback compensation network is used for detecting the output voltage and transmitting the output voltage to the PWM controller, so that the PWM controller carries out PWM regulation on the first-stage converter according to the output voltage. The embodiment of the invention can effectively improve the conversion efficiency of the converter in a wide input voltage range.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a wide-voltage input DC-DC converter.
Background
With the development of power electronic technology, the demand for the electric energy conversion device is higher and higher, and the following challenges are faced: firstly, the requirement on the voltage input range of a power supply direct current power supply is wider and wider, such as rail transit (42V-160 VDC), a high-voltage military power supply (155V-650 VDC) and the like; secondly, the requirements on the power density of the converter device are higher and higher, and the efficiency is higher in the whole input voltage range; thirdly, in order to improve the safety of the system, the input and output of the converter device are required to be electrically isolated in many occasions at present; fourth, from the viewpoint of development of converter device products, a DC-DC converter requiring a wide input voltage can have the highest efficiency under typical input voltage conditions. The conversion efficiency of the existing DC-DC converter in a wide input voltage range is low.
Disclosure of Invention
The invention provides a wide-voltage input DC-DC converter, which aims to solve the technical problem that the conversion efficiency of the existing DC-DC converter is low in a wide input voltage range.
An embodiment of the present invention provides a wide voltage input DC-DC converter, including:
the feedback compensation circuit comprises a first-stage converter, a second-stage converter, a PWM controller, a resonance controller and a feedback compensation network;
the input end of the first-stage converter is connected with the voltage input end, and the output end of the first-stage converter is connected with the input end of the second-stage converter;
the resonance controller is connected with the second-stage converter;
the second-stage converter is sequentially connected with the feedback compensation network, the PWM controller and the first-stage converter;
the first stage converter is used for converting the wide input voltage of the voltage input end into an intermediate bus voltage; the second-stage converter is used for converting the intermediate bus voltage into output voltage according to a preset proportion; the feedback compensation network is used for detecting output voltage and transmitting the output voltage to the PWM controller, so that the PWM controller carries out PWM regulation on the first-stage converter according to the output voltage.
Further, the first stage converter includes: the circuit comprises a first capacitor C101, a second capacitor C102, a first switch tube Q101, a second switch tube Q102, a first diode D101, a second diode D102 and a first inductor L101;
the first switch tube Q101, the first inductor L101 and the second diode D102 are sequentially connected in series;
one end of the first capacitor C101 is connected to the drain of the first switching tube Q101 and the positive voltage input end respectively; the other end of the first capacitor C101 is connected with a voltage negative electrode input end; one end of the first capacitor C101 is connected to a positive voltage input end, and the first capacitor C101, the first diode D101, the second switch tube Q102 and the second capacitor C102 are connected in parallel;
one end of the first capacitor C101 is connected between the first switching tube Q101 and the first inductor L101, and the other end of the first capacitor C101 is connected to the voltage negative input end; the drain of the second switching tube Q102 is connected between the first inductor L101 and the second diode D102, and the source of the second switching tube Q102 is connected to the negative voltage input end; one end of the second capacitor C102 is connected to the output end of the second diode D102, and the other end of the second capacitor is connected to the voltage negative input end.
Further, the second stage converter includes: a third switching tube Q103, a fourth switching tube Q104, a third inductor Lr, a third capacitor Cr, a transformer T101, a third diode D201, a fourth diode D202, and a fourth capacitor C201;
the dotted terminal of the transformer T101 is connected to the source of the third switching tube Q103 through the third inductor Lr, and the source of the third switching tube Q103 is connected to the drain of the fourth switching tube Q104; the non-dotted terminal of the primary winding of the transformer T101 is connected with the source electrode of the fourth switching tube Q104 through the third capacitor Cr, and the dotted terminal of the first secondary winding of the transformer T101 is connected with the cathode of the diode D202;
the dotted terminal of the second secondary winding of the transformer T101 is connected to the cathode of the diode D201, the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are simultaneously grounded through the fourth capacitor C201 and the output resistor RL connected in parallel, and the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are also simultaneously grounded through the resistor R201 and the resistor R202; the anodes of the diode D201 and the diode D202 are both grounded.
Further, the first-stage converter is a double-tube Buck-Boost converter or a four-switch Buck-Boost converter.
Furthermore, the loop control mode of the first-stage converter comprises one of voltage mode single closed-loop control, peak current mode double closed-loop control, average current mode double closed-loop control and hysteresis control.
Further, the second-stage converter is a full-bridge LLC resonant converter or a half-bridge LLC resonant converter, and the operating frequency of the second-stage converter is the same as the resonant frequency of the third inductor Lr and the third capacitor Cr.
Further, an auxiliary coil is wound out of the transformer T101 in the second-stage converter, and the auxiliary coil is used for multi-output.
Further, the intermediate bus voltage output by the first-stage converter and the output voltage output by the second converter are in a direct proportion relationship, the ratio of the direct proportion relationship is the turn ratio of a first transformer in the second converter, and an input-output voltage gain equation of the wide-voltage input DC-DC converter is obtained through calculation according to the duty ratio of the first-stage converter, the direct proportion relationship and the turn ratio.
Further, when the output voltage exceeds a preset value, a full-bridge rectification circuit is adopted on the secondary side of the second-stage converter.
According to the embodiment of the invention, the wide-input two-stage DC-DC converter is formed by the first-stage converter and the second-stage converter, the advantage of double-tube Buck-Boost wide voltage input is combined with the advantage of high efficiency of the LLC resonant converter, high-efficiency conversion of the DC-DC converter can be realized in a wide input voltage range, and the optimal efficiency can be obtained under a typical input voltage condition.
Drawings
Fig. 1 is a schematic diagram of a wide voltage input DC-DC converter provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of the first and second stage converters provided by the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a four-switch Buck-Boost converter provided by an embodiment of the invention;
FIG. 4 is a schematic diagram of a synchronous rectification circuit provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a rectifier circuit using a full bridge diode according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second converter multiplexed output provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of an analog control circuit provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of a digital control circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1-8, in a first embodiment of the present invention, there is provided a wide voltage input DC-DC converter shown in fig. 1, including:
a first stage converter 10, a second stage converter 20, a PWM controller 30, a resonant controller 40 and a feedback compensation network 50; the PWM controller 30 and the resonance control in the embodiment of the present invention may be controlled by a pure hardware analog circuit, or by a digital controller.
The input end of the first-stage converter 10 is connected with the voltage input end, and the output end of the first-stage converter 10 is connected with the input end of the second-stage converter 20;
the resonance controller 40 is connected with the second-stage converter 20;
the second-stage converter 20 is connected with the feedback compensation network 50, the PWM controller 30 and the first-stage converter 10 in sequence;
the first stage converter 10 is used to convert a wide input voltage at the voltage input terminal into an intermediate bus voltage; the second-stage converter 20 is configured to convert the intermediate bus voltage into an output voltage according to a preset ratio; the feedback compensation network 50 is used for detecting the output voltage and transmitting the output voltage to the PWM controller 30, so that the PWM controller 30 performs PWM adjustment on the first-stage converter 10 according to the output voltage.
In the embodiment of the invention, the first-stage converter 10 is a double-tube Buck-Boost converter or a four-switch Buck-Boost converter, the second-stage converter 20 is a full-bridge LLC resonant converter or a half-bridge LLC resonant converter, and the intermediate bus voltage Vbus is set as a typical input voltage.
In the embodiment of the present invention, the intermediate bus voltage Vbus converted by the first-stage converter 10 is a fixed voltage, and on this basis, the efficiency, i.e., the operating state, of the second-stage converter 20 can be optimized.
Optionally, the feedback compensation network 50 may directly detect the output voltage, and send the output voltage after performing error amplification to the controller of the first-stage Buck-Boost converter, so as to adjust the duty ratio D of the first-stage converter 10 Buck-Boost. The intermediate bus voltage Vbus output by the first-stage converter 10 is in a direct proportion to the output voltage Vout of the second-stage converter 20, the ratio is the turn ratio N of the second-stage converter 20, and the gain equation of the input and output voltages of the wide-voltage input DC-DC converter of the present embodiment is:
in a specific embodiment, the first-stage converter 10 is a double-transistor Buck-Boost converter, wherein the voltage stress borne by the first switch Q101 and the first diode D101 is an input voltage Vin, and the voltage stress borne by the second switch Q102 and the second diode D102 is an output voltage Vbus. The switching tube control strategy of the embodiment of the invention can adopt a single-mode control strategy or a dual-mode control strategy, namely when Vin is less than Vbus, the first switching tube Q101 is kept on, the second switching tube Q102 is subjected to PWM control, and the converter works in a Boost mode; when Vin is larger than or equal to Vbus, the second switching tube Q102 is kept turned off, PWM modulation is carried out on the first switching tube Q101, and the converter works in a Buck mode.
Referring to fig. 2, the first stage converter 10 includes: the circuit comprises a first capacitor C101, a second capacitor C102, a first switch tube Q101, a second switch tube Q102, a first diode D101, a second diode D102 and a first inductor L101;
the first switching tube Q101, the first inductor L101 and the second diode D102 are sequentially connected in series;
one end of the first capacitor C101 is connected to the drain of the first switching tube Q101 and the voltage positive input end respectively; the other end of the first capacitor C101 is connected with a voltage negative electrode input end; one end of the first capacitor C101 is connected with the voltage positive input end, and the first capacitor C101, the first diode D101, the second switch tube Q102 and the second capacitor C102 are connected in parallel;
one end of a first capacitor C101 is connected between the first switching tube Q101 and the first inductor L101, and the other end of the first capacitor C101 is connected with the voltage negative pole input end; the drain of the second switching tube Q102 is connected between the first inductor L101 and the second diode D102, and the source of the second switching tube Q102 is connected with the voltage negative input end; one end of the second capacitor C102 is connected to the output end of the second diode D102, and the other end of the second capacitor C102 is connected to the voltage negative input end.
With continued reference to fig. 2, the second stage converter 20 includes: a third switching tube Q103, a fourth switching tube Q104, a third inductor Lr, a third capacitor Cr, a transformer T101, a third diode D201, a fourth diode D202, and a fourth capacitor C201;
the dotted terminal of the transformer T101 is connected to the source of the third switching tube Q103 through the third inductor Lr, and the source of the third switching tube Q103 is connected to the drain of the fourth switching tube Q104; the non-dotted terminal of the primary winding of the transformer T101 is connected with the source electrode of the fourth switching tube Q104 through a third capacitor Cr, and the dotted terminal of the first secondary winding of the transformer T101 is connected with the cathode of the diode D202;
the dotted terminal of the second secondary winding of the transformer T101 is connected to the cathode of the diode D201, the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are grounded through the fourth capacitor C201 and the output resistor RL which are connected in parallel, and the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are grounded through the resistor R201 and the resistor R202; the anodes of the diode D201 and the diode D202 are both grounded.
Referring to fig. 3, the first-stage converter 10 according to the embodiment of the present invention is a four-switch converter, which can further improve the conversion efficiency of the converter.
Referring to fig. 7, in a specific embodiment, the control circuit adopts a pure hardware analog circuit control manner, the first-stage converter 10 adopts a single-mode control strategy, and the controller UC2843 of the first-stage converter 10 switches on and off the first switching tube Q101 and the second switching tube Q102, and adopts a peak current mode, and its specific working process is as follows: after the output voltage Vo is subjected to error amplification of a Type III compensation network, the amplified output voltage Vo is transmitted to a Comp pin of a controller through an opto-coupler opto, and after the amplified output voltage Vo is compared with a current signal CS, a PWM wave with a certain duty ratio is generated to control the on and off of a first switching tube Q101 and a second switching tube Q102, so that the output voltage Vbus of a double-tube Buck-Boost is regulated;
the second-stage converter 20 adopts UCC25600 as a fixed frequency controller of an isolation-stage LLC resonant converter, and the working process is as follows: the UCC25600 generates complementary square waves with 50% duty ratio with dead zones and fixed frequency fr, drives a third switching tube Q103 and a fourth switching tube Q104, chops the output voltage Vbus of a regulating stage to obtain the square waves with 50% duty ratio and Vbus amplitude, and acts the square waves on a resonance network consisting of a resonance electric pole Lr, a third capacitor Cr and a transformer primary side excitation inductor Lm, the transformer secondary side obtains output voltage Vo after rectification and filtering, if the working frequency fr of the LLC is arranged near the resonance point of Lr and Cr, Vo is Vbus/N, wherein N is the turn ratio of the transformer primary side to the secondary side;
the first-stage converter 10 and the second-stage converter 20 jointly act to form a closed loop, and the regulation of Vo is realized by adjusting the output voltage Vbus of the double-tube Buck-Boost equivalent to the regulation stage;
the specific parameters of the preferred embodiment of the present invention are as follows: input voltage Vin: 155V- -650VDC, output voltage Vo: 28V, rated output power 600W, a double-tube Buck-Boost inductor L equal to 80uH, a resonant inductor Lr equal to 17uH, a third capacitor Cr equal to 50nF, a regulating stage output voltage Vbus equal to 280V, and an original secondary side turn ratio N of the transformer equal to 10.
In a specific embodiment, the control circuit is controlled in a digital control mode, so that the configuration of the converter can be more flexible, a complex control algorithm which is difficult to realize by a pure hardware circuit can be realized, and the efficiency of the regulating stage is further optimized.
Referring to fig. 8, the embodiment of the present invention adopts a part of digital control to control the basic working process: a digital controller DSP (such as UCD3138 of TI, dsPIC33fj16gs series of Microchip and the like) respectively samples an error amplification signal, an inductive current signal, an input voltage Vin signal and an output Vbus signal of a double-tube Buck-Boost, when Vin is less than Vbus, a first switch tube Q101 is kept on, PWM control is carried out on a second switch tube Q102, and the converter works in a Boost mode; when Vin is larger than or equal to Vbus, the second switching tube Q102 is kept turned off, PWM modulation is carried out on the first switching tube Q101, and the converter works in a Buck mode. At the same time, the DSP generates a complementary 50% duty cycle square wave with dead zone, fixed frequency fr, where fr is equal to the resonant frequency of Lr, Cr.
As a specific implementation manner of the embodiment of the present invention, the loop control manner of the first stage converter 10 includes one of voltage mode single closed-loop control, peak current mode double closed-loop control, average current mode double closed-loop control, and hysteresis control.
As a specific implementation manner of the embodiment of the present invention, the second-stage converter 20 is a full-bridge LLC resonant converter or a half-bridge LLC resonant converter, and the operating frequency of the second-stage converter 20 is the same as the resonant frequency of the third inductor Lr and the third capacitor Cr.
The embodiment of the invention adopts the full-bridge LLC resonant converter as the second-stage converter 20, and can effectively expand the output power grade of the converter.
As a specific implementation manner of the embodiment of the present invention, the transformer T101 in the second stage converter 20 winds out an auxiliary winding, and the auxiliary winding is used for multi-output.
According to the embodiment of the invention, the auxiliary coil is wound in the second converter for multi-path output, so that the linear regulation rate and the load regulation rate of the converter can be effectively improved.
Referring to fig. 5, when the output voltage exceeds a predetermined value, the secondary side of the second-stage converter 20 adopts a full-bridge rectifier circuit.
Optionally, the secondary output of the second converter employs a synchronous rectification technique, including self-driven synchronous rectification and externally driven synchronous rectification. Fig. 4 is a schematic diagram of a synchronous rectification circuit according to an embodiment of the present invention.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the wide-input two-stage DC-DC converter is formed by the first-stage converter 10 and the second-stage converter 20, the advantage of double-tube Buck-Boost wide voltage input is combined with the advantage of high efficiency of the LLC resonant converter, high-efficiency conversion of the DC-DC converter can be realized in a wide input voltage range, and the optimal efficiency can be obtained under a typical input voltage condition. Further, the output of the second-stage resonance transformer in the embodiment of the invention is a square wave with a duty ratio of 50%, and the second-stage resonance transformer can be conveniently expanded to be applied to multi-path output.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.
Claims (9)
1. A wide voltage input DC-DC converter, comprising:
the feedback compensation circuit comprises a first-stage converter, a second-stage converter, a PWM controller, a resonance controller and a feedback compensation network;
the input end of the first-stage converter is connected with the voltage input end, and the output end of the first-stage converter is connected with the input end of the second-stage converter; the second-stage converter is sequentially connected with the feedback compensation network, the PWM controller and the first-stage converter;
the first stage converter is used for converting the wide input voltage of the voltage input end into an intermediate bus voltage; the second-stage converter is used for converting the intermediate bus voltage into output voltage according to a preset proportion; the feedback compensation network is used for detecting output voltage and transmitting the output voltage to the PWM controller, so that the PWM controller carries out PWM regulation on the first-stage converter according to the output voltage.
2. The wide voltage input DC-DC converter according to claim 1, wherein the first stage converter comprises: the circuit comprises a first capacitor C101, a second capacitor C102, a first switch tube Q101, a second switch tube Q102, a first diode D101, a second diode D102 and a first inductor L101;
the first switch tube Q101, the first inductor L101 and the second diode D102 are sequentially connected in series; one end of the first capacitor C101 is connected to the drain of the first switching tube Q101 and the positive voltage input end respectively; the other end of the first capacitor C101 is connected with a voltage negative electrode input end; one end of the first capacitor C101 is connected to a positive voltage input end, and the first capacitor C101, the first diode D101, the second switch tube Q102 and the second capacitor C102 are connected in parallel;
one end of the first capacitor C101 is connected between the first switching tube Q101 and the first inductor L101, and the other end of the first capacitor C101 is connected to the voltage negative input end; the drain of the second switching tube Q102 is connected between the first inductor L101 and the second diode D102, and the source of the second switching tube Q102 is connected to the negative voltage input end; one end of the second capacitor C102 is connected to the output end of the second diode D102, and the other end of the second capacitor is connected to the voltage negative input end.
3. The wide voltage input DC-DC converter according to claim 1, wherein the second stage converter comprises: a third switching tube Q103, a fourth switching tube Q104, a third inductor Lr, a third capacitor Cr, a transformer T101, a third diode D201, a fourth diode D202, and a fourth capacitor C201;
the dotted terminal of the transformer T101 is connected to the source of the third switching tube Q103 through the third inductor Lr, and the source of the third switching tube Q103 is connected to the drain of the fourth switching tube Q104; the non-dotted terminal of the primary winding of the transformer T101 is connected with the source electrode of the fourth switching tube Q104 through the third capacitor Cr, and the dotted terminal of the first secondary winding of the transformer T101 is connected with the cathode of the diode D202;
the dotted terminal of the second secondary winding of the transformer T101 is connected to the cathode of the diode D201, the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are grounded through the fourth capacitor C201 and the output resistor RL connected in parallel at the same time, and the non-dotted terminal of the first secondary winding of the transformer T101 and the dotted terminal of the second secondary winding are grounded through the resistor R201 and the resistor R202 at the same time; the anodes of the diode D201 and the diode D202 are both grounded.
4. The wide voltage input DC-DC converter according to claim 1, wherein the first stage converter is a two-transistor Buck-Boost converter or a four-switch Buck-Boost converter.
5. The wide voltage input DC-DC converter according to claim 1, wherein the loop control mode of the first stage converter comprises one of voltage mode single closed loop control, peak current mode double closed loop control, average current mode double closed loop control, and hysteresis control.
6. The wide voltage input DC-DC converter according to claim 1, wherein the second stage converter is a full bridge LLC resonant converter or a half bridge LLC resonant converter, and the operating frequency of the second stage converter is the same as the resonant frequency of the third inductor Lr and the third capacitor Cr.
7. The wide voltage input DC-DC converter according to claim 1, wherein the transformer T101 in the second stage converter winds an auxiliary winding, and the auxiliary winding is used for multiplexing.
8. The wide voltage input DC-DC converter according to claim 1, wherein the intermediate bus voltage output by the first stage converter is in direct proportion to the output voltage output by the second converter, and the ratio of the direct proportion is the turn ratio of the first transformer in the second converter, and the input-output voltage gain equation of the wide voltage input DC-DC converter is calculated according to the duty ratio of the first stage converter, the direct proportion and the turn ratio.
9. The wide voltage input DC-DC converter according to claim 1, wherein the secondary side of the second stage converter employs a full bridge rectification circuit when the output voltage exceeds a preset value.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114710038A (en) * | 2022-05-30 | 2022-07-05 | 七四九(南京)电子研究院有限公司 | Power supply circuit applied to module power source primary side bootstrap drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114710038A (en) * | 2022-05-30 | 2022-07-05 | 七四九(南京)电子研究院有限公司 | Power supply circuit applied to module power source primary side bootstrap drive |
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| CN117294150A (en) * | 2023-11-27 | 2023-12-26 | 深圳麦格米特电气股份有限公司 | Switching power supply and electronic equipment |
| CN117477956A (en) * | 2023-12-28 | 2024-01-30 | 华北理工大学 | Airborne digital high-voltage direct-current power distribution system |
| CN117477956B (en) * | 2023-12-28 | 2024-03-26 | 华北理工大学 | Airborne digital high-voltage direct-current power distribution system |
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Application publication date: 20211207 |