CN114679049A - High-efficiency zero-voltage conversion converter - Google Patents

High-efficiency zero-voltage conversion converter Download PDF

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Publication number
CN114679049A
CN114679049A CN202210193711.XA CN202210193711A CN114679049A CN 114679049 A CN114679049 A CN 114679049A CN 202210193711 A CN202210193711 A CN 202210193711A CN 114679049 A CN114679049 A CN 114679049A
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main
auxiliary
switching tube
electrically connected
resonant circuit
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张昌运
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Zhejiang Aifeike Electric Technology Co ltd
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Zhejiang Aifeike Electric Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits

Abstract

The invention relates to a high-efficiency zero-voltage conversion converter, comprising: the device comprises an input voltage, a main inductor, a main switching tube, a boost diode, a main resonant circuit, an auxiliary resonant circuit and an auxiliary switching tube; the positive pole of the input voltage is electrically connected with the main inductor and the negative pole of the main switching tube in sequence, and the negative pole of the input voltage is electrically connected with the positive pole of the main switching tube; the positive pole of the boost diode is electrically connected with the main inductor and the negative pole of the main switching tube, the negative pole of the boost diode is electrically connected with one end of the main resonant circuit, and the other end of the main resonant circuit is electrically connected with the negative pole of the input voltage and the positive pole of the main switching tube; one end of the auxiliary resonant circuit is electrically connected between the main inductor and the anode of the boost diode, the other end of the auxiliary resonant circuit is electrically connected between the cathode of the auxiliary switching tube and the cathode of the boost diode, and the anode of the auxiliary switching tube is electrically connected between the cathode of the input voltage and one end of the main resonant circuit.

Description

High-efficiency zero-voltage conversion converter
Technical Field
The invention belongs to the field of analog-to-digital conversion circuits, and particularly relates to a high-efficiency zero-voltage conversion converter.
Background
In order to reduce the volume and weight of the AC/DC converter, high frequency is a commonly used solution, but the APFC circuit (active power factor correction circuit) in the high-power AC/DC converter has four typical problems: firstly, the problem of switching loss of a switching tube is solved; secondly, the problem of capacitive opening; thirdly, the problem of inductive turn-off; and fourthly, the diode is reversely recovered to be turned off. These four problems reduce the conversion efficiency of the high power AC/DC converter and the reliability of the APFC circuit.
Disclosure of Invention
In order to solve the technical problems in the related art, the present invention provides a high efficiency zero voltage conversion converter, including: the device comprises an input voltage, a main inductor, a main switching tube, a boost diode, a main resonant circuit, an auxiliary resonant circuit and an auxiliary switching tube; the positive electrode of the input voltage is electrically connected with the main inductor and the negative electrode of the main switching tube in sequence, and the negative electrode of the input voltage is electrically connected with the positive electrode of the main switching tube; the positive electrode of the boost diode is electrically connected with the main inductor and the negative electrode of the main switching tube, the negative electrode of the boost diode is electrically connected with one end of the main resonant circuit, and the other end of the main resonant circuit is electrically connected with the negative electrode of the input voltage and the positive electrode of the main switching tube; one end of the auxiliary resonant circuit is electrically connected between the main inductor and the anode of the boost diode, the other end of the auxiliary resonant circuit is electrically connected between the cathode of the auxiliary switching tube and the cathode of the boost diode, and the anode of the auxiliary switching tube is electrically connected between the cathode of the input voltage and one end of the main resonant circuit; the two ends of the main switching tube are also connected with a main output junction capacitor and a main parasitic body diode in parallel, and the positive and negative directions of the main parasitic body diode are the same as those of the two ends of the main switching tube; and two ends of the auxiliary switching tube are also connected with an auxiliary output junction capacitor in parallel.
The high efficiency zero voltage conversion converter of the present invention also has the following optional features.
Optionally, the primary resonant circuit comprises a primary filter capacitor and a resistor connected in parallel.
Optionally, the secondary resonant circuit comprises a secondary inductance and a secondary filter capacitance connected in parallel.
Optionally, a first rectifying diode is connected between the secondary resonant circuit and the negative electrode of the boost diode.
Optionally, a second rectifying diode is electrically connected between the cathode of the auxiliary switching tube and the auxiliary filter capacitor.
Optionally, a third rectifier diode is electrically connected between the negative electrode of the auxiliary switching tube and the auxiliary filter inductor.
Optionally, two ends of the auxiliary switching tube are further connected in parallel with an auxiliary parasitic body diode, and a positive direction and a negative direction of the auxiliary parasitic body diode are the same as those of the two ends of the auxiliary switching tube.
Optionally, the main switching tube and the auxiliary switching tube are both MOS tubes.
The high-efficiency zero-voltage conversion (zero-voltage switch) converter utilizes an active network to inhibit (or eliminate) the reverse recovery current of a boost diode, releases the energy on a main output junction capacitor before a main switching tube is switched on, and finally transfers the energy to other places to realize that the energy in the main output junction capacitor circulates in each device or is fed back to a load instead of being lost on a channel of an MOSFET (metal-oxide-semiconductor field effect transistor); meanwhile, the zero-voltage turn-off of the main switching tube can be achieved by utilizing a buffer technology, so that the problems of switching loss of the switching tube, capacitive turn-on, inductive turn-off and reverse recovery turn-off of a diode in an APFC (active power factor correction) circuit in a high-power AC/DC converter are solved.
Drawings
Embodiments of the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of one embodiment of a sampling resistor based current sensor of the present invention;
FIG. 2 is a first modality diagram of FIG. 1;
FIG. 3 is a second modality diagram of FIG. 1;
FIG. 4 is a third modality diagram of FIG. 1;
FIG. 5 is a fourth modality diagram of FIG. 1;
FIG. 6 is a fifth modality diagram of FIG. 1;
FIG. 7 is a sixth modality diagram of FIG. 1;
FIG. 8 is a seventh modality diagram of FIG. 1;
FIG. 9 is an eighth modality diagram of FIG. 1;
fig. 10 is a waveform diagram of the main device operation of the sampling resistance-based current sensor of the present invention in eight modes.
Detailed Description
Referring to fig. 1 to 9, L is the main inductor of the APFC circuit, S is the main switch tube, S1 is the auxiliary switch tube, Cs and Ds are the output junction capacitor and parasitic body diode of the main switch tube, respectively, D is the boost diode, Cs1And Ds1Are respectively an auxiliary switch tube S1Secondary output junction capacitance and secondary parasitic body diode, C0And R0The primary filter capacitor and the resistor in the primary resonant circuit are respectively, the Lr and the Cr are respectively the secondary inductor and the secondary filter capacitor in the secondary resonant circuit, and the D1, the D2 and the D3 are respectively a first rectifier diode, a second rectifier diode and a third rectifier diode. The main switch tube S and the auxiliary switch tube S1 are MOS tubes. The arrows in fig. 2 to 9 are the current directions.
Prior to analysis, the following assumptions were made:
(1) all the switch devices and diodes are ideal, namely, the voltage drop and the on-resistance of the switch are neglected;
(2) the equivalent internal resistance and the capacitance value drift of the capacitor are ignored;
(3)R0l and C are linear elements;
(4) the boost inductor L Is large enough, and the current thereof Is substantially constant in one switching cycle, i.e., a constant current Is;
(5) the filter capacitor Co is large enough that its voltage remains substantially constant, i.e. constant voltage Vo, during a switching cycle.
Fig. 2 to 10 show equivalent circuits of the converter under different switching states, and the working conditions of the switching states are described as follows:
suppose an auxiliary switch tube S1Before the switch-on, the current Is flows through the boost diode D, the voltage Vcr on the output junction capacitor Ds of the main switch tube S Is Vo, S1And opening and starting the working mode.
Referring to fig. 2 and 10, in the first mode M1 of the circuit:
before the time t0, the main switch tube S and the auxiliary switch tube S1In the off state, the boost diode D is turned on; at time t0, the auxiliary switch tube S1 is turned on, and the current i of the auxiliary inductor Lr is at this timeLrStarting from 0, rises linearly with a rising slopeComprises the following steps:
Figure BDA0003526024580000041
and the current on the boost diode D starts to drop linearly with a falling slope of:
Figure BDA0003526024580000042
At time t1, iLrWhen the current rises to the boost inductor current Is, the current of the boost diode D Is reduced to 0, the boost diode D Is naturally turned off, the first mode M1 Is ended, and the duration of the mode Is as follows:
Figure BDA0003526024580000043
referring to fig. 3 and 10, in the second mode M2 of the circuit:
at t1 to t2, when iLrRising to boost inductor current Is, secondary inductor Lr begins to be coupled to capacitor (Cs)1+ Cs) resonance, iLrThe current continues to rise, and the voltage of (Cs1+ Cs) starts to fall, with the initial conditions of this mode:
VCs1(0)＝Vo
ILr(0)＝Is
the state equation of this modality:
Figure BDA0003526024580000051
Figure BDA0003526024580000052
solving the state equation:
ILr(t)＝IL·cosωt
VCr(t)＝-IL·Z0 sinωt
C＝Cs+Cs1
in the formula:
Figure BDA0003526024580000053
referring to fig. 4 and 10, in the third mode M3 of the circuit:
at t2 to t3, when the voltage of the secondary filter capacitor Cr drops to 0, the parasitic diode Ds of the main switching tube S is turned on, clamping the voltage of the main switching tube S to zero, and the main switching tube S realizes zero-voltage switching-on, so that the problem of switching loss of the switching tube is solved because the main switching tube S is switched on at zero voltage. At the moment, the Boost main inductive current ILaComprises the following steps:
Figure BDA0003526024580000054
in the above formula, Z0Is the resonant impedance in the resonant circuit.
The modal duration is:
Figure BDA0003526024580000055
therefore, zero voltage switching-on of the main switching tube S is realized, and the switching-on time of the main switching tube S lags behind the switching-on time of the auxiliary switching tube S1:
Figure BDA0003526024580000056
referring to fig. 5 and 10, in the fourth mode M4 of the circuit:
The auxiliary switching tube S1, I is turned off at time t3LrThe auxiliary filter capacitor Cr is charged until time t4, and the initial conditions of the state are as follows:
VCs1(0)＝0
VCr(0)＝0
Figure BDA0003526024580000061
the state equation of this modality:
Figure BDA0003526024580000062
Figure BDA0003526024580000063
solving the state equation:
Figure BDA0003526024580000064
Figure BDA0003526024580000065
in the formula:
Figure BDA0003526024580000066
ω in the above formulanRepresenting the resonant frequency.
Due to the auxiliary filter capacitor Cr, the auxiliary switch tube S1 is turned off at zero voltage.
Referring to fig. 6 and 10, in the fifth mode M5 of the circuit:
in this mode, the voltage applied to the secondary inductor Lr is-Vo, iLrThe linearity decreases.
Figure BDA0003526024580000067
At time t5, iLrDown to 0, the duration of this mode is:
Figure BDA0003526024580000068
referring to fig. 7 and 10, in the sixth mode M6 of the circuit:
the mode is the same as or similar to the operation of a traditional Boost circuit (Boost chopper circuit) when a power tube is conducted.
Referring to fig. 8 and 10, in the seventh mode M7 of the circuit:
at the time t6, the main switching tube S is turned off, the main inductor L simultaneously charges the output junction capacitor Cs and discharges the auxiliary filter capacitor Cr, and the main switching tube S is turned off at zero voltage due to the output junction capacitor Cs and the auxiliary filter capacitor Cr.
The initial conditions of this modality are:
Figure BDA0003526024580000071
ILr(0)＝0
v in the above formulacs1The voltage across the junction capacitor Cs1 is output for the current auxiliary switch tube S1.
The state equation is:
Figure BDA0003526024580000072
Figure BDA0003526024580000073
Figure BDA0003526024580000074
solving the equation of state yields:
Figure BDA0003526024580000075
In the formula:
Figure BDA0003526024580000076
omega in the above formula2Representing the resonant frequency 2, C is the parasitic capacitance of the current main switching tube S1.
Referring to fig. 9 and 10, in the eighth mode M8 of the circuit:
this mode works the same or similar to the freewheeling state of normal Boost PWM (Boost pulse width modulation).
Zero voltage turn-on condition: after the auxiliary tube S1 Is turned on, the current of the auxiliary inductor Lr begins to rise until the input inductor current Is, the auxiliary inductor Lr, the output junction capacitor Cs and the auxiliary output connection capacitor Cs1Starting resonance, in order to enable the main switching tube S to realize zero voltage switching-on, the current of the auxiliary inductor Lr must satisfy the following conditions:
Figure BDA0003526024580000077
wherein:
Figure BDA0003526024580000078
the soft switching states of the switching devices in the circuit are respectively shown in table 1:
TABLE 1
Switching device On state Off state
Main switch tube S ZVS (zero voltage switch) ZVS
Auxiliary switch tube S1 ZCS (zero current switch) ZVS
Boost diode D ZVS ZCS
To realize zero-voltage switching, the main switching tube S needs to delay the switching time of the auxiliary switching tube S1:
Figure BDA0003526024580000081
in summary, the switching tubes all work in the optimal state of zero voltage and zero current, so that the problems of switching loss, capacitive turn-on and inductive turn-off of the switching tubes are effectively solved, and meanwhile, the boost diode D works in the states of zero voltage turn-on and zero current turn-off, so that the problem of reverse recovery turn-off of the diode does not exist.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. A high efficiency zero voltage conversion converter, comprising: the device comprises an input voltage, a main inductor, a main switching tube, a boost diode, a main resonant circuit, an auxiliary resonant circuit and an auxiliary switching tube; the positive pole of the input voltage is electrically connected with the main inductor and the negative pole of the main switching tube in sequence, and the negative pole of the input voltage is electrically connected with the positive pole of the main switching tube; the positive electrode of the boost diode is electrically connected with the main inductor and the negative electrode of the main switching tube, the negative electrode of the boost diode is electrically connected with one end of the main resonant circuit, and the other end of the main resonant circuit is electrically connected with the negative electrode of the input voltage and the positive electrode of the main switching tube; one end of the auxiliary resonant circuit is electrically connected between the main inductor and the anode of the boost diode, the other end of the auxiliary resonant circuit is electrically connected between the cathode of the auxiliary switching tube and the cathode of the boost diode, and the anode of the auxiliary switching tube is electrically connected between the cathode of the input voltage and one end of the main resonant circuit; the two ends of the main switching tube are also connected with a main output junction capacitor and a main parasitic body diode in parallel, and the positive and negative directions of the main parasitic body diode are the same as those of the two ends of the main switching tube; and two ends of the auxiliary switching tube are also connected with an auxiliary output junction capacitor in parallel.
2. The high efficiency zero voltage converter according to claim 1, wherein the primary resonant circuit comprises a primary filter capacitor and a resistor connected in parallel.
3. The high efficiency zero voltage switching converter according to claim 1 wherein said secondary resonant circuit comprises a secondary inductor and a secondary filter capacitor connected in parallel.
4. The high efficiency zero voltage conversion converter according to claim 3, wherein a first rectifying diode is connected between the secondary resonant circuit and the negative pole of the boost diode.
5. The high efficiency zero voltage converter according to claim 3, wherein a second rectifying diode is electrically connected between the negative electrode of the auxiliary switching tube and the secondary filter capacitor.
6. The high efficiency zero voltage converter according to claim 3, wherein a third rectifying diode is electrically connected between the negative electrode of the auxiliary switching tube and the secondary filter inductor.
7. The high efficiency zero voltage conversion converter according to claim 1, wherein the two ends of the auxiliary switch tube are further connected in parallel with an auxiliary parasitic body diode, and the positive and negative directions of the auxiliary parasitic body diode are the same as those of the two ends of the auxiliary switch tube.
8. The high efficiency zero voltage conversion converter according to claim 1, wherein said main switching transistor and said auxiliary switching transistor are both MOS transistors.
CN202210193711.XA 2022-03-01 2022-03-01 High-efficiency zero-voltage conversion converter Pending CN114679049A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1246747A (en) * 1998-08-31 2000-03-08 深圳市华为电气股份有限公司 Topologic circuit of DC-DC soft switch power change
CN204707032U (en) * 2015-03-23 2015-10-14 燕山大学 Based on the Zero voltage transition circuit of Boost
CN106788215A (en) * 2016-12-30 2017-05-31 株洲中车时代电气股份有限公司 For the Sofe Switch dc/dc boost converter of the collecting and distributing power supply of photovoltaic

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1246747A (en) * 1998-08-31 2000-03-08 深圳市华为电气股份有限公司 Topologic circuit of DC-DC soft switch power change
CN204707032U (en) * 2015-03-23 2015-10-14 燕山大学 Based on the Zero voltage transition circuit of Boost
CN106788215A (en) * 2016-12-30 2017-05-31 株洲中车时代电气股份有限公司 For the Sofe Switch dc/dc boost converter of the collecting and distributing power supply of photovoltaic

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