CN103441690B - Method for controlling combined converter for achieving tight adjusting output with high-frequency alternating-current side connected in series - Google Patents
Method for controlling combined converter for achieving tight adjusting output with high-frequency alternating-current side connected in series Download PDFInfo
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- CN103441690B CN103441690B CN201310360447.5A CN201310360447A CN103441690B CN 103441690 B CN103441690 B CN 103441690B CN 201310360447 A CN201310360447 A CN 201310360447A CN 103441690 B CN103441690 B CN 103441690B
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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
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- 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
Abstract
The invention relates to the technology of energy converters, and provides a method for controlling a combined converter for achieving tight adjusting output with a high-frequency alternating-current side connected in series. According to the method, the drive signals of a front-stage isolated type inverter are adjusted to achieve the adjustment of the output of an auxiliary transformer, and therefore the voltage difference of the input voltage and the output voltage of a Dc-Dc converter behind the auxiliary transformer is controlled within an adjusting target range. The utilization rate of the transformer is maximized, closed-loop control over an output side is achieved through the non-isolated Dc-Dc converter, and the reliability of feedback control is improved. Soft switching is easy to achieve, and high frequency and high efficiency are achieved. The voltage stress and the current stress of the auxiliary transformer are not influenced when output in a wide voltage range is. A synchronous rectification technology is adopted more easily in the rectifying circuit of an auxiliary side.
Description
Technical field
The present invention relates to a kind of isolated form Dc/Dc electric energy transducer, specifically a kind of Dc/Dc current transformer by auxiliary Dc-Dc current transformer adjustment combined converter output voltage.
Background technology
The application scenario of much electricity conversion needs to realize the electrical isolation between input, output, also needs the tight adjustment of output voltage, so that when proof load disturbance or input voltage variation, output voltage is still constant.In order to realize the tight adjustment exported, general employing isolates Dc/Dc current transformer with high frequency transformer, as shown in Figure 1, by the duty ratio of former limit switching tube or the adjustment of switching frequency, realizes the constant of output voltage.Although such scheme is simple, efficiency is lower, and especially the operative duty cycles of transformer also can change along with the duty cycle adjustment of circuit, causes the utilance of transformer to reduce.
In order to improve the utilance of transformer, the structure of two-stage Dc/Dc can be adopted, as shown in Figure 2.Transformer wherein in first order DC/Dc is being operated in the state of fixed duty cycle, and the Dc-Dc current transformer relying on rear class not isolate realizes the tight adjustment of output voltage.Adopt such structure, although prime is as DCX, an equivalent commutator transformer can be regarded as, the optimization of implementation efficiency.But all input powers will through Two Stages, and efficiency reduces.The series connection of a kind of AC is proposed, the efficient convertor circuit topology of DC output side tight adjustment in parallel, as shown in Figure 3 in document (CN102185493A).For the purpose of simplifying the description, the inverter in figure is equivalent to alternating current source Vin.Because the realization of the output voltage adjustment capability of this topology relies on Dc-Dc current transformer in parallel, therefore when output voltage excursion is wider, it is very large that the input side of Dc-Dc current transformer in parallel bears change in voltage, and the changed power scope of its process is also very large, therefore its voltage stress is too high, is unfavorable for the efficiency optimization of current transformer.
Summary of the invention
The technical problem to be solved in the present invention is, overcome the deficiencies in the prior art, there is provided a kind of and both can obtain very high efficiency, the high-frequency ac side series connection that can realize again the Dc-Dc current transformer combined converter exporting tight adjustment realizes the control method of the combined converter that tight adjustment exports.By regulating the drive singal of prime isolated form inverter, regulating the output of auxiliary transformer, thus the input voltage of the Dc-Dc current transformer of auxiliary transformer side and the voltage difference of output voltage can be controlled within optimum range.
For technical solution problem, solution of the present invention is:
There is provided a kind of high-frequency ac side to connect and realize the tight control method adjusting the combined converter exported, be the adjustment exported by regulating the drive singal of prime isolated form inverter to realize auxiliary transformer, thus the input voltage of Dc-Dc current transformer after auxiliary transformer and the voltage difference of output voltage are controlled within the scope of adjustment aim; The method specifically comprises: by utilizing the cascaded structure of high frequency transformer former limit winding, and Partial Power is flowed into load through the directly process of main transformer, and another part power flows into load again through the process of auxiliary transformer and Dc-Dc current transformer; In this process, the voltage before and after the feedback circuit sampling Dc-Dc current transformer utilizing outlet side, and the tight adjustment of output voltage is realized by the output of feedback circuit control Dc-Dc current transformer; , after the output of the output and main transformer of comparing auxiliary transformer, controlled by the alternating current input power supplying of feedback circuit to former limit, change auxiliary transformer being exported follow main transformer to export and changing meanwhile.
The high-frequency ac side series connection that invention further provides for realizing preceding method realizes the combined converter that tight adjustment exports, comprise main transformer and auxiliary transformer, after the former limit winding of main transformer and the former limit windings in series of auxiliary transformer, the respective other end receives the two ends of high frequency input source respectively; An output of main transformer vice-side winding is provided with a rectifier Rec1, and one of rectifier Rec1 exports termination and exports ground, and another output is connected to the anode of output capacitance Co; Another termination of output capacitance Co exports ground, and load RL is connected in output capacitance Co two ends; The output of described auxiliary transformer secondary winding is provided with a rectifier Rec2, the output of rectifier Rec2 is connected to the two ends of electric capacity C1, the input of Dc-Dc current transformer is all connected to the two ends of electric capacity C1 simultaneously, an output of this Dc-Dc current transformer is connected to and exports ground, and another output is then connected to the anode of output capacitance Co;
Also be provided with feedback circuit at the outlet side of auxiliary transformer secondary winding, this feedback circuit one end is connected to for sampling between auxiliary transformer output and electric capacity C1, and the other end is connected between Dc-Dc current transformer and output capacitance Co anode for sampling; Establish first control circuit and second control circuit in feedback circuit, the anode that Dc-Dc current transformer exports is connected to the input of first control circuit and second control circuit simultaneously, and the anode that rectifier Rec2 exports also is connected to the input of second control circuit; The output of first control circuit is connected to the control end of Dc-Dc current transformer, and the output of first control circuit receives the control end of high frequency input source Vin.
In the present invention, described feedback circuit also comprises two bleeder circuits, is resistance R1-R2 series connection group and resistance R3-R4 series connection group respectively;
Described rectifier Rec2 is located at the diode D12 between auxiliary transformer secondary Motor Winding Same Name of Ends and electric capacity C1 anode, the negative electrode of diode D12 is connected to the anode of electric capacity C1 and one end of resistance R3-R4 series connection group simultaneously, another termination of resistance R3-R4 series connection group exports ground, and its mid point is connected to one end of the negative input end of error amplifier and the feedback network Z of error amplifier simultaneously;
The input of described first control circuit and one end of resistance R1-R2 series connection group are all connected to output capacitance Co anode, the output of first control circuit is connected to the control end of Dc-Dc current transformer, the mid point of resistance R1-R2 series connection group is connected to the positive input terminal of error amplifier, and another termination of resistance R1-R2 series connection group exports ground; The output of error amplifier is connected to the other end of feedback network Z and the input of second control circuit simultaneously; The output of second control circuit is then connected to the control end of the switching tube Q1 being located at transformer primary side winding side;
One end of one termination, two transformer series former limit windings of switching tube Q1, the ground of another termination input of switching tube Q1; The anode of another termination high frequency input source Vin of two transformer series former limit windings, the negative terminal of input source Vin connects the ground of input;
Corresponding with rectifier Rec2, described rectifier Rec1 is the diode D1 be located between the output of main transformer vice-side winding and output capacitance Co; The negative pole of diode D1 is connected to the anode of output capacitance Co.
In the present invention, the vice-side winding of described main transformer and auxiliary transformer is centre cap structure, and forms rectifier Rec1 and rectifier Rec2 with two diodes separately;
Described rectifier Rec1 has following structure: the anode of a termination road diode D1 of main transformer secondary first winding, and the negative electrode of diode D1 receives the anode of output capacitance Co; The other end of main transformer secondary first winding with being connected to output simultaneously with one end of secondary second winding, the other end of main transformer secondary second winding then receives the anode of diode D2, and the negative electrode of diode D2 receives the negative electrode of diode D1;
Described rectifier Rec2 has following structure: an end of auxiliary transformer secondary first winding is connected to the anode of diode D3, and the other end then receives the negative terminal of electric capacity C1 and one end of the second winding simultaneously; The negative electrode of diode D3 is connected to the anode of electric capacity C1 and the negative electrode of diode D4 simultaneously, and the anode of diode D4 then receives the other end of auxiliary transformer copy second winding;
Described feedback circuit also comprises two bleeder circuits, is resistance R1-R2 series connection group and resistance R3-R4 series connection group respectively; One end of resistance R3-R4 series connection group is connected to the anode of electric capacity C1, and the other end then connects and exports ground, and its mid point is connected to one end of the negative input end of error amplifier and the feedback network Z of error amplifier simultaneously;
The input of first control circuit and one end of resistance R1-R2 series connection group are all connected to output capacitance Co anode, the output of first control circuit is connected to the control end of Dc-Dc current transformer, the mid point of resistance R1-R2 series connection group is connected to the positive input terminal of error amplifier, and another termination of resistance R1-R2 series connection group exports ground; The output of error amplifier is connected to the other end of feedback network Z and the input of second control circuit simultaneously; The output of second control circuit is connected to the half-bridge driver being located at transformer primary side winding side;
High frequency input source Vin side comprises switching tube Q1-Q2 series connection group, the anode of one termination high frequency input source Vin, the other end with connecing input simultaneously with one end of resonant capacitance Cr, one end of another termination two transformer series former limit windings of resonant capacitance Cr; One end of another termination resonant inductance Lr1 of two transformer series former limit windings, the mid point of another termination switching tube Q1-Q2 series connection group of resonant inductance Lr1; The control end of switching tube Q1 and Q2 is all connected to half-bridge driver, and the negative terminal of high frequency input source Vin connects input ground.
In the present invention, described first control circuit and second control circuit are any one in pwm control circuit, resonance oscillation semi-bridge control circuit, constant frequency PWM control circuit or frequency conversion control circuit.
Relative to prior art, beneficial effect of the present invention:
1, the utilance of main transformer and auxiliary transformer maximizes;
2, the closed-loop control of outlet side realizes by not isolating Dc-Dc current transformer, improves the reliability of FEEDBACK CONTROL;
3, easily realize Sofe Switch, realize high frequency efficient rate;
4, the voltage and current stress of auxiliary transformer is not affected when wide-voltage range exports;
5, the rectification circuit of secondary more easily adopts synchronous rectification.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1: conventional P WM current transformer;
Fig. 2: two-stage cascade type current transformer;
Fig. 3: the tight adjustment combined converter of transformer primary side AC series connection;
Fig. 4: the control strategy of the combined converter for the series connection of transformer primary side AC that the present invention proposes;
Fig. 5: the flyback combined converter adopting control strategy in the present invention;
Fig. 6: the resonance oscillation semi-bridge type combined converter adopting the control strategy in the present invention.
Embodiment
As shown in Figure 4, the present embodiment comprises two transformer T1 and T2, and after the former limit winding of main transformer T1 and the former limit windings in series of auxiliary transformer T2, the respective other end receives the two ends of high frequency input source Vin respectively.The input of rectification circuit Rec1 is received in the output of the vice-side winding of T1.The input of rectification circuit Rec2 is received in the output of the vice-side winding of T2.Output one end of Rec1 receives the anode of Co, and the other end is received and exported Vo negative terminal.Load RL mono-end receives the anode of output capacitance Co, and the other end receives the negative terminal of Vo.Output one end of rectifier Rec2 receives the anode of electric capacity C1, and the other end receives the negative terminal of C1.The positive input terminal just terminating to Dc-Dc current transformer of C1, the negative terminal of C1 receives the negative input end of Dc-Dc current transformer.Output one termination of Dc-Dc current transformer exports the anode of Vo, the ground that another termination exports.The input of its control circuit 1 and the input of control circuit 2 are received in the output of Dc-Dc current transformer simultaneously, and the output of control circuit 1 receives the control end of Dc-Dc current transformer; Another input of control circuit 2 receives the anode of electric capacity C1, and the output of control circuit 2 receives the control end of Vin.Except the embodiment in Fig. 5,6, the control circuit 1 and 2 in the present invention can adopt traditional constant frequency PWM control circuit or frequency conversion control circuit.
The present embodiment utilizes the cascaded structure of high frequency transformer former limit winding, and Partial Power flows into load through the directly process of T1, and another part power after T2, then through the process of Dc-Dc current transformer, flows into load.Therefore, by such structure, both achieved the tight adjustment of output voltage, and made again Partial Power only through the process of one-level, improve the efficiency of overall power conversion.Rely on Dc-Dc current transformer to realize the tight adjustment of output voltage simultaneously.The outlet side that is delivered in of feedback control signal carries out, and is controlled the output of secondary Dc-Dc current transformer, can avoid the circuit that the reliabilities such as light-coupled isolation are low by feedback circuit.In addition, the alternating current input power supplying on former limit can by after the output of more auxiliary transformer and the output of main transformer, by control circuit 2, input is controlled, thus realization output voltage regulates the output of auxiliary transformer follow the exporting change of main transformer and change, even if can change in wider scope also can not produce large impact to the power that auxiliary transformer and Dc-Dc current transformer bear.
According to the embodiment in Fig. 5, control strategy of the present invention is further described.The Same Name of Ends just terminating to main transformer T11 former limit winding of input dc power potential source Vin, the other end of T11 former limit winding receives the Same Name of Ends of the former limit winding of transformer T12, the other end of T12 former limit winding receives one end of switching tube Q1, and the other end of Q1 receives the ground of input; The control end of switching tube Q1 is connected to the output of pwm control circuit 2; The Same Name of Ends of the vice-side winding of main transformer T11 receives the ground of outlet side, and the other end receives the anode of diode D1, and the negative electrode of D1 receives the anode of output capacitance Co; Load RL is in parallel with output capacitance Co; The Same Name of Ends of the vice-side winding of auxiliary transformer T12 receives the negative terminal of output capacitance C1, and the other end receives the anode of diode D12, and the negative electrode of D12 receives the anode of C1; The positive and negative two ends of electric capacity C1 are as the positive and negative input of Dc-Dc current transformer.The output of Dc-Dc current transformer 1 is in parallel with output capacitance Co.
The bleeder circuit be composed in series by resistance R3 and R4, wherein an end of R3 receives the anode of electric capacity C1, and the other end receives the negative input end of resistance R4 and error amplifier 1, receives one end of the feedback network Z of error amplifier 1 simultaneously; The other end of resistance R4 is received and is exported ground.
Resistor network R1 and R2 series connection is sampled as the dividing potential drop of output voltage; Wherein an end of resistance R1 receives the anode of output capacitance, and the other end receives one section of resistance R4, receives the positive input of error amplifier 1 simultaneously; The other end of resistance R2 is received and is exported ground.The output of error amplifier 1 receives another section of feedback network Z, receives the input of pwm control circuit simultaneously; The output of pwm control circuit 2 receives the control end of Q1.
In embodiment according to Fig. 6, an end of the switching tube Q1 in the half-bridge of former limit receives the anode of input Vin, and the other end of Q1 receives one end of Q2, receives one end of resonant capacitance Cr simultaneously.Q2 another termination input low.The control termination drive circuit of Q1 and Q2.The other end of Cr1 receives one end of resonant inductance Lr1, and the other end of Lr1 receives one end of T11 former limit winding, and the other end of T11 former limit winding receives one end of T12 former limit winding.The other end of T12 former limit winding receives the ground of input.Tap structure centered by the vice-side winding of main transformer T11, the anode of a termination road diode D1 of T11 secondary first winding, the negative electrode of D1 receives the anode of output capacitance Co.Another section of first winding is received and is exported one end that secondary second winding is received on ground simultaneously; Another section of secondary second winding receives the anode of diode D2.The negative electrode of D2 receives the negative electrode of D1.
The secondary of auxiliary transformer T12 is similarly centre cap structure, the anode of one termination road D3 of secondary first winding of T12, the other end of T12 first winding receives the negative terminal of electric capacity C1, receive one end of the second winding simultaneously, the negative electrode of D3 receives the anode of electric capacity C1, receives the negative electrode of diode D4 simultaneously.The other end of second winding of T12 receives the anode of diode D4.Electric capacity C1 receives input anode and the negative terminal of Dc-Dc current transformer 1, and the output plus terminal of Dc-Dc current transformer receives the anode of Co.
The bleeder circuit be composed in series by resistance R3 and R4, wherein an end of R3 receives the anode of electric capacity C1, and the other end receives the negative input end of resistance R4 and error amplifier 1, receives one end of the feedback network Z of error amplifier 1 simultaneously; The other end of resistance R4 is received and is exported ground.
Resistor network R1 and R2 series connection is sampled as the dividing potential drop of output voltage; Wherein an end of resistance R1 receives the anode of output capacitance, and the other end receives one section of resistance R4, receives the positive input of error amplifier 1 simultaneously; The other end of resistance R2 is received and is exported ground.The output of error amplifier 1 receives another section of feedback network Z, receives the input of resonance oscillation semi-bridge control circuit 2 simultaneously.The output of resonance oscillation semi-bridge control circuit 2 receives the input of half-bridge drive circuit, and the first output of half-bridge drive circuit receives the control end of Q1, and the second output receives the control end of Q2.
It should be noted that the specific term used when some feature of the present invention or scheme are described should not be used for representing and redefine this term here to limit of the present invention some certain features, feature or the scheme relevant to this term.In a word, should by the terminological interpretation used in the claims of enclosing for not limiting the invention to specific embodiment disclosed in specification, unless above-mentioned detailed description part explicitly defines these terms.Therefore, actual range of the present invention not only comprises the disclosed embodiments, be also included under claims implement or perform all equivalents of the present invention.
Claims (5)
1. the series connection of high-frequency ac side realizes the control method of the combined converter that tight adjustment exports, it is characterized in that, be the adjustment exported by regulating the drive singal of prime isolated form inverter to realize auxiliary transformer, thus the input voltage of DC-DC current transformer after auxiliary transformer and the voltage difference of output voltage are controlled within the scope of adjustment aim; The method specifically comprises: by utilizing the cascaded structure of high frequency transformer former limit winding, and Partial Power is flowed into load through the directly process of main transformer, and another part power flows into load again through the process of auxiliary transformer and DC-DC current transformer; In the process of power transimission, the voltage before and after the feedback circuit sampling DC-DC current transformer utilizing outlet side, and the tight adjustment of output voltage is realized by the output of feedback circuit control DC-DC current transformer; , after the output of the output and main transformer of comparing auxiliary transformer, controlled by the alternating current input power supplying of feedback circuit to former limit, change auxiliary transformer being exported follow main transformer to export and changing meanwhile.
2. the high-frequency ac side series connection for realizing method described in claim 1 realizes the combined converter that tight adjustment exports, comprise main transformer and auxiliary transformer, after the former limit winding of main transformer and the former limit windings in series of auxiliary transformer, the respective other end receives the two ends of high frequency input source respectively; It is characterized in that, an output of main transformer vice-side winding is provided with a rectifier Rec1, and one of rectifier Rec1 exports termination and exports ground, and another output is connected to the anode of output capacitance Co; Another termination of output capacitance Co exports ground, and load RL is connected in output capacitance Co two ends; The output of described auxiliary transformer secondary winding is provided with a rectifier Rec2, the output of rectifier Rec2 is connected to the two ends of electric capacity C1, the input of DC-DC current transformer is all connected to the two ends of electric capacity C1 simultaneously, an output of this DC-DC current transformer is connected to and exports ground, and another output is then connected to the anode of output capacitance Co;
Also be provided with feedback circuit at the outlet side of auxiliary transformer secondary winding, this feedback circuit one end is connected to for sampling between auxiliary transformer output and electric capacity C1, and the other end is connected between DC-DC current transformer and output capacitance Co anode for sampling; Establish first control circuit and second control circuit in feedback circuit, the anode that DC-DC current transformer exports is connected to the input of first control circuit and second control circuit simultaneously, and the anode that rectifier Rec2 exports also is connected to the input of second control circuit; The output of first control circuit is connected to the control end of DC-DC current transformer, and the output of first control circuit receives the control end of high frequency input source Vin.
3. combined converter according to claim 2, is characterized in that, described feedback circuit also comprises two bleeder circuits, is resistance R1-R2 series connection group and resistance R3-R4 series connection group respectively;
Described rectifier Rec2 is located at the diode D12 between auxiliary transformer secondary Motor Winding Same Name of Ends and electric capacity C1 anode, the negative electrode of diode D12 is connected to the anode of electric capacity C1 and one end of resistance R3-R4 series connection group simultaneously, another termination of resistance R3-R4 series connection group exports ground, and its mid point is connected to one end of the negative input end of error amplifier and the feedback network Z of error amplifier simultaneously;
The input of described first control circuit and one end of resistance R1-R2 series connection group are all connected to output capacitance Co anode, the output of first control circuit is connected to the control end of DC-DC current transformer, the mid point of resistance R1-R2 series connection group is connected to the positive input terminal of error amplifier, and another termination of resistance R1-R2 series connection group exports ground; The output of error amplifier is connected to the other end of feedback network Z and the input of second control circuit simultaneously; The output of second control circuit is then connected to the control end of the switching tube Q1 being located at transformer primary side winding side;
One end of one termination, two transformer series former limit windings of switching tube Q1, the ground of another termination input of switching tube Q1; The anode of another termination high frequency input source Vin of two transformer series former limit windings, the negative terminal of input source Vin connects the ground of input;
Corresponding with rectifier Rec2, described rectifier Rec1 is the diode D1 be located between the output of main transformer vice-side winding and output capacitance Co; The negative pole of diode D1 is connected to the anode of output capacitance Co.
4. combined converter according to claim 2, is characterized in that, the vice-side winding of described main transformer and auxiliary transformer is centre cap structure, and forms rectifier Rec1 and rectifier Rec2 with two diodes separately;
Described rectifier Rec1 has following structure: an end of main transformer secondary first winding receives the anode of diode D1, and the negative electrode of diode D1 receives the anode of output capacitance Co; The other end of main transformer secondary first winding with being connected to output simultaneously with one end of secondary second winding, the other end of main transformer secondary second winding then receives the anode of diode D2, and the negative electrode of diode D2 receives the negative electrode of diode D1;
Described rectifier Rec2 has following structure: an end of auxiliary transformer secondary first winding is connected to the anode of diode D3, and the other end then receives the negative terminal of electric capacity C1 and one end of the second winding simultaneously; The negative electrode of diode D3 is connected to the anode of electric capacity C1 and the negative electrode of diode D4 simultaneously, and the anode of diode D4 then receives the other end of auxiliary transformer secondary second winding;
Described feedback circuit also comprises two bleeder circuits, is resistance R1-R2 series connection group and resistance R3-R4 series connection group respectively; One end of resistance R3-R4 series connection group is connected to the anode of electric capacity C1, and the other end then connects and exports ground, and its mid point is connected to one end of the negative input end of error amplifier and the feedback network Z of error amplifier simultaneously;
The input of first control circuit and one end of resistance R1-R2 series connection group are all connected to output capacitance Co anode, the output of first control circuit is connected to the control end of DC-DC current transformer, the mid point of resistance R1-R2 series connection group is connected to the positive input terminal of error amplifier, and another termination of resistance R1-R2 series connection group exports ground; The output of error amplifier is connected to the other end of feedback network Z and the input of second control circuit simultaneously; The output of second control circuit is connected to the half-bridge driver being located at transformer primary side winding side;
High frequency input source Vin side comprises switching tube Q1-Q2 series connection group, the anode of one termination high frequency input source Vin, the other end with connecing input simultaneously with one end of resonant capacitance Cr, one end of another termination two transformer series former limit windings of resonant capacitance Cr; One end of another termination resonant inductance Lr1 of two transformer series former limit windings, the mid point of another termination switching tube Q1-Q2 series connection group of resonant inductance Lr1; The control end of switching tube Q1 and Q2 is all connected to half-bridge driver, and the negative terminal of high frequency input source Vin connects input ground.
5. according to the combined converter described in claim 2-4 any one, it is characterized in that, described first control circuit and second control circuit are any one in pwm control circuit, resonance oscillation semi-bridge control circuit, constant frequency PWM control circuit or frequency conversion control circuit.
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| CN201310360447.5A CN103441690B (en) | 2013-08-18 | 2013-08-18 | Method for controlling combined converter for achieving tight adjusting output with high-frequency alternating-current side connected in series |
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| CN106685213A (en) * | 2017-01-13 | 2017-05-17 | 成都中科慧源科技有限公司 | Anti-high voltage interference circuit |
| CN107171563B (en) * | 2017-06-07 | 2019-10-25 | 浙江大学 | The combined converter of tight adjustment output |
| CN113839565B (en) * | 2021-11-26 | 2022-02-18 | 深圳市永联科技股份有限公司 | Wide output voltage control method, wide output voltage control circuit and charging pile |
| CN117240097A (en) * | 2022-06-08 | 2023-12-15 | 中兴通讯股份有限公司 | Partial power regulating type converter |
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| TWI221351B (en) * | 2003-07-30 | 2004-09-21 | Renesas System Solution Asia P | Symmetrical duty-cycle control device of current-mode controlled half-bridge DC/DC converter |
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| CN1462109A (en) * | 2001-03-16 | 2003-12-17 | 台达电子工业股份有限公司 | Auxiliary output voltage control realized using idirectional magnetization magnetic amplifier |
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