CN112564481A - Four-phase staggered circuit for high-power switching power supply - Google Patents
Four-phase staggered circuit for high-power switching power supply Download PDFInfo
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- CN112564481A CN112564481A CN202011449472.7A CN202011449472A CN112564481A CN 112564481 A CN112564481 A CN 112564481A CN 202011449472 A CN202011449472 A CN 202011449472A CN 112564481 A CN112564481 A CN 112564481A
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
Abstract
The invention provides a four-phase staggered circuit for a high-power switching power supply, which comprises an input circuit, an input current detection circuit, a four-phase staggered circuit, an output current detection circuit, an output circuit, an input voltage sampling circuit, an output voltage sampling circuit and a four-phase staggered control circuit, wherein the circuit respectively controls the on and off of a four-phase switching tube by detecting the peak current of an input side and the peak current of an output side, so that the current and the voltage are transmitted by four-phase inductance in a staggered manner to achieve the purpose of power conversion and transmission; compared with the traditional power transmission conversion circuit, the four-phase staggered circuit of the high-power switching power supply provided by the invention has the advantages that the same power is transmitted and converted, the used components are few, the cost is low, the size is small, the power density of the switching power supply is improved, a new transmission conversion scheme is provided for the high-power switching power supply, and the contribution is made to the improvement of the transmission power of the switching power supply.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a four-phase staggered circuit for a high-power switching power supply.
Background
The switching power supply is a power conversion circuit mainly composed of inductors, capacitors, transformers, switching tubes and the like, and converts the existing voltage into the power supply voltage required by various electronic and electrical equipment. In recent years, with the development of electronic technology, especially the development of new energy electric vehicles, the battery capacity is larger and smaller, the charging time requirement is shorter and shorter, and the requirement on the conversion power of the switching power supply is increased, so that the improvement of the transmission power density and the realization of the maximum power conversion transmission become the key of the increased power conversion of the switching power supply in the existing structural space. The commonly used framework for realizing power conversion of the switching power supply circuit at present is a BUCK topology framework and a BOOST topology framework, BUCK is mainly applied to a step-down circuit, output voltage is lower than input voltage, BOOST is mainly applied to a BOOST circuit, the output voltage is higher than the input voltage, but the two topology structures need to realize larger power conversion, an inductive magnetic device needs to be designed very greatly, for a power supply module with limited structural space, power is increased by increasing the size of the inductive structure, almost a process which is difficult to realize is realized, meanwhile, the transmission conversion efficiency can be reduced, and great heat loss is brought.
In order to solve the above problems, the present invention provides a four-phase interleaved circuit for a high power switching power supply.
Disclosure of Invention
The invention provides a four-phase staggered circuit for a high-power switching power supply.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a four-phase interleaved circuit for a high-power switching power supply comprises an input circuit, an input current detection circuit, a four-phase interleaved circuit, an output current detection circuit, an output circuit, an input voltage sampling circuit, an output voltage sampling circuit and a four-phase interleaved control circuit, wherein the input circuit is connected with a first port of the input current detection circuit and an input end of the input voltage sampling circuit, a second port of the input current detection circuit is connected with an input port of the four-phase interleaved circuit, an output port of the four-phase interleaved circuit is connected with a first port of the output current detection circuit, a second port of the output current detection circuit is connected with input ends of the output circuit and the output voltage sampling circuit, a third port of the input current detection circuit, an output port of the input voltage sampling circuit, a third port of the output current detection circuit and an output port of the output voltage sampling circuit are respectively connected with the four-phase interleaved control circuit The four input ports, four-phase staggered control circuit output control signal for four-phase staggered circuit, its characterized in that: the circuit controls the on and off of the four-phase switch tube in the four-phase staggered circuit respectively by detecting the peak current and the peak voltage of the input circuit and the output circuit, so that the current and the voltage transmitted by the four-phase inductor in a staggered manner meet the requirement of power conversion transmission.
Furthermore, the four-phase interleaved circuit comprises a four-phase inductor, an input side circuit and an output side circuit, the four-phase inductor comprises a first inductor, a second inductor, a third inductor and a fourth inductor,
the input side circuit comprises eight input side MOS tubes and eight input side diodes, wherein the input side first MOS tube and the input side second MOS tube form an input side first phase switch tube, the input side third MOS tube and the input side fourth MOS tube form an input side second phase switch tube, the input side fifth MOS tube and the input side sixth MOS tube form an input side third phase switch tube, the input side seventh MOS tube and the input side eighth MOS tube form an input side fourth phase switch tube, the source electrode of the input side first MOS tube is connected with the drain electrode of the input side second MOS tube, the anode of the input side first diode, the cathode of the input side second diode and one end of a first inductor, the source electrode of the input side third MOS tube is connected with the drain electrode of the input side fourth MOS tube, the anode of the input side third diode, the cathode of the input side fourth diode and one end of a second inductor, the source electrode of the input side fifth MOS tube is connected with the drain electrode of the input, The cathode of the input side sixth diode and one end of the third inductor, the source of the input side seventh MOS transistor is connected with the drain of the input side eighth MOS transistor, the anode of the input side seventh diode, the cathode of the input side eighth diode and one end of the fourth inductor, the cathodes of the input side first, third, fifth and seventh diodes are connected with the input positive end of the input side line, and the anodes of the input side second, fourth, sixth and eighth diodes are connected with the input negative end of the input side line;
the output side circuit comprises eight output side MOS tubes and eight output side diodes, wherein the first and second MOS tubes on the output side form a first phase switching tube on the output side, the third and fourth MOS tubes on the output side form a second phase switching tube on the output side, the fifth and sixth MOS tubes on the output side form a third phase switching tube on the output side, the seventh and eighth MOS tubes on the output side form a fourth phase switching tube on the output side, the source electrode of the first MOS tube on the output side is connected with the drain electrode of the second MOS tube on the output side, the anode of the first diode on the output side, the cathode of the second diode on the output side and the other end of the first inductor, the source electrode of the third MOS tube on the output side is connected with the drain electrode of the fourth MOS tube on the output side, the anode of the third diode on the output side, the cathode of the fourth diode on the output side and the other end of the second inductor, and the source electrode of the fifth MOS tube on the output side is connected with the drain electrode of the sixth MOS tube on the output, The cathode of the output side sixth diode and the other end of the third inductor, the source of the output side seventh MOS transistor is connected with the drain of the output side eighth MOS transistor, the anode of the output side seventh diode, the cathode of the output side eighth diode and the other end of the fourth inductor, the cathodes of the output side first, third, fifth and seventh diodes are connected with the output positive end of the output side line, and the anodes of the output side second, fourth, sixth and eighth diodes are connected with the output negative end of the output side line.
Furthermore, the input current detection circuit comprises eight input side current detection circuits, each input side current detection circuit comprises a peak current detection circuit of an input side current transformer corresponding to the input side current detection circuit, one end of a primary side of each input side first, third, fifth and seventh current transformer is respectively connected with a drain electrode of the input side first MOS transistor, third MOS transistor, fifth MOS transistor and seventh MOS transistor, the other end of each input side first, third, fifth and seventh current transformer is connected with an input positive end of the input circuit, one end of a primary side of each input side second, fourth, sixth and eighth current transformer is respectively connected with a source electrode of the input side second MOS transistor, fourth MOS transistor, sixth MOS transistor and eighth MOS transistor, and the other end of each input side second, fourth, sixth and eighth current transformer is connected with an input negative end of the input circuit.
Furthermore, the output current detection circuit includes eight output side current detection circuits, each output side current detection circuit is a peak current detection circuit including an output side current transformer corresponding thereto, one end of a primary side of the first, third, fifth, and seventh output side current transformers is respectively connected to the drain of the first MOS transistor, the third MOS transistor, the fifth MOS transistor, and the seventh MOS transistor, the other end of the primary side of the first, third, fifth, and seventh output side current transformers is connected to the output positive terminal of the output circuit, one end of the primary side of the second, fourth, sixth, and eighth output side current transformers is respectively connected to the source of the second MOS transistor, the fourth MOS transistor, the sixth MOS transistor, and the eighth MOS transistor, and the other end of the primary side of the second, fourth, sixth, and eighth output negative terminal of the output circuit.
Furthermore, the input voltage sampling circuit is connected with the positive end of the input circuit, and the output voltage sampling circuit is connected with the positive end of the output circuit and respectively becomes a low-voltage signal after being subjected to resistance voltage division.
Further, the four-phase staggered control circuit comprises a PWM chip, and the PWM chip receives current and voltage signals of an input side and an output side and outputs control signals to the grid electrodes of the MOS tubes of the four-phase staggered circuit.
Furthermore, the input line and the output line adopt filter lines formed by capacitors and inductors.
Compared with the prior art, the invention has the following technical effects:
compared with the traditional power transmission conversion circuit, the four-phase staggered circuit for the high-power switching power supply provided by the invention has the advantages that the same power is transmitted and converted, the used components are few, the cost is low, the size is small, the power density of the switching power supply is improved, a new transmission conversion scheme is provided for the high-power switching power supply, and the contribution is made to the improvement of the transmission power of the switching power supply.
Drawings
Fig. 1 is a block diagram of a four-phase interleaved circuit for a high-power switching power supply provided by the invention.
FIG. 2 is a schematic diagram of a four-phase interleaved circuit according to the present invention.
Fig. 3 is a timing diagram of an application example of a four-phase staggered circuit according to the present invention.
Fig. 4 is another timing diagram of an application example of a four-phase staggered circuit according to the present invention.
Fig. 5 is a third timing diagram of an application example of a four-phase staggered circuit according to the present invention.
Detailed Description
The following provides an embodiment of the circuit of the present invention with reference to the accompanying drawings to explain the technical solution of the present invention in detail.
In the schematic block diagram of fig. 1, an input line is connected to a first port of an input current detection line and an input end of an input voltage sampling line, a second port of the input current detection line is connected to an input port of a quad-interleaved line, an output port of the quad-interleaved line is connected to a first port of an output current detection line, a second port of the output current detection line is connected to input ports of an output line and an output voltage sampling line, a third port of the input current detection line, an output port of the input voltage sampling line, a third port of the output current detection line and an output port of the output voltage sampling line are connected to a quad-interleaved control line, and the quad-interleaved control line outputs a control signal to the quad-interleaved line.
As shown in fig. 2 below, the four-phase interleaved line includes an input-side line 100, an output-side line 200, a four-phase inductor 300 connected between the input-side line 100 and the output-side line 200, and the four-phase inductor 300 includes a first inductor L101, a second inductor L102, a third inductor L103, and a fourth inductor L104.
The input-side line 100 includes eight input-side MOS transistors and eight input-side diodes, wherein the input-side first MOS transistor Q101 and the input-side second MOS transistor Q102 constitute an input-side first-phase switching transistor, the input-side third MOS transistor Q103 and the input-side fourth MOS transistor Q104 constitute an input-side second-phase switching transistor, the input-side fifth MOS transistor Q105 and the input-side sixth MOS transistor Q106 constitute an input-side third-phase switching transistor, the input-side seventh MOS transistor Q107 and the input-side eighth MOS transistor Q108 constitute an input-side fourth-phase switching transistor, the source of the input-side first MOS transistor Q101 is connected to the drain of the input-side second MOS transistor Q102, the anode of the input-side first diode CR101, the cathode of the input-side second diode CR102, and one end of the first inductor L101, the source of the input-side third MOS transistor Q103 is connected to the drain of the input-side fourth MOS transistor Q104, the anode of the input-side third diode CR103, the cathode of the, a source of the INPUT-side fifth MOS transistor Q105 is connected to a drain of the INPUT-side sixth MOS transistor Q106, an anode of the INPUT-side fifth diode CR105, a cathode of the INPUT-side sixth diode CR106, and one end of the third inductor L103, a source of the INPUT-side seventh MOS transistor Q107 is connected to a drain of the INPUT-side eighth MOS transistor Q108, an anode of the INPUT-side seventh diode CR107, a cathode of the INPUT-side eighth diode CR108, and one end of the fourth inductor L104, cathodes of the INPUT-side first diode CR101, the INPUT-side third diode CR103, the INPUT-side fifth diode CR105, and the INPUT-side seventh diode CR107 are connected to the INPUT positive terminal INPUT of the INPUT-side line, and anodes of the INPUT-side second diode CR102, the INPUT-side fourth diode CR104, the INPUT-side sixth diode CR106, and the INPUT-side eighth diode CR108 are connected to the INPUT negative terminal INPUT;
the output-side line 200 is a line symmetrical to the input-side line 100, and includes eight output-side MOS transistors and eight output-side diodes, wherein an output-side first MOS transistor Q201 and an output-side second MOS transistor Q202 constitute an output-side first-phase switching transistor, an output-side third MOS transistor Q203 and an output-side fourth MOS transistor Q204 constitute an output-side second-phase switching transistor, an output-side fifth MOS transistor Q205 and an output-side sixth MOS transistor Q206 constitute an output-side third-phase switching transistor, an output-side seventh MOS transistor Q207 and an output-side eighth MOS transistor Q208 constitute an output-side fourth-phase switching transistor, a source of the output-side first MOS transistor Q201 is connected to a drain of the output-side second MOS transistor Q202, an anode of the output-side first diode CR201, a cathode of the output-side second diode CR202, and the other end of the first inductor L101, a source of the output-side third MOS transistor Q203 is connected to a drain of the output-side fourth MOS transistor Q204, an anode of the output-side third diode CR203, a cathode of the output-side second diode CR204, and the other end of the second inductor L102, the source of the OUTPUT-side fifth MOS transistor Q205 is connected to the drain of the OUTPUT-side sixth MOS transistor Q206, the anode of the OUTPUT-side fifth diode CR205, the cathode of the OUTPUT-side sixth diode CR206, and the other end of the third inductor L103, the source of the OUTPUT-side seventh MOS transistor Q207 is connected to the drain of the OUTPUT-side eighth MOS transistor Q208, the anode of the OUTPUT-side seventh diode CR207, the cathode of the OUTPUT-side eighth diode CR208, and the other end of the fourth inductor L104, and the cathodes of the OUTPUT-side first diode CR201, the OUTPUT-side third diode CR203, the OUTPUT-side fifth diode CR205, and the OUTPUT-side seventh diode CR207 are connected to the OUTPUT plus terminal OUTPUT + OUTPUT of the OUTPUT-side line, and the anodes of the OUTPUT-side second diode CR202, the OUTPUT-side fourth diode CR204, the OUTPUT-side sixth diode CR206, and the OUTPUT-side eighth diode CR208 are connected to the OUTPUT minus terminal OUTPUT-OUTPUT of the OUTPUT-side line.
The INPUT current detection circuit is a peak current detection circuit comprising current transformers, as shown in fig. 2, primary side ends of an INPUT side first current transformer T101, an INPUT side third current transformer T103, an INPUT side fifth current transformer T105 and an INPUT side seventh current transformer T107 are respectively connected with drain electrodes of an INPUT side first MOS transistor Q101, an INPUT side third MOS transistor Q103, an INPUT side fifth MOS transistor Q105 and an INPUT side seventh MOS transistor Q107, and the other end is connected with an INPUT positive terminal INPUT + of the INPUT side circuit; primary sides of the INPUT side second current transformer T102, the INPUT side fourth current transformer T104, the INPUT side sixth current transformer T106, and the INPUT side eighth current transformer T108 have one end connected to sources of the INPUT side second MOS transistor Q102, the INPUT side fourth MOS transistor Q104, the INPUT side sixth MOS transistor Q106, and the INPUT side eighth MOS transistor Q108, and the other end connected to an INPUT negative terminal INPUT of the INPUT side line.
The OUTPUT current detection circuit is a peak current detection circuit the same as the input current detection circuit, and as shown in fig. 2, one primary side ends of the OUTPUT side first current transformer T201, the OUTPUT side third current transformer T203, the OUTPUT side fifth current transformer T205 and the OUTPUT side seventh current transformer T207 are respectively connected with the drains of the OUTPUT side first MOS transistor Q201, the OUTPUT side third MOS transistor Q203, the OUTPUT side fifth MOS transistor Q205 and the OUTPUT side seventh MOS transistor Q207, and the other end is connected with the OUTPUT positive terminal OUTPUT +; primary sides of the OUTPUT side second current transformer T202, the OUTPUT side fourth current transformer T204, the OUTPUT side sixth current transformer T206 and the OUTPUT side eighth current transformer T208 are connected to sources of the OUTPUT side second MOS transistor Q202, the OUTPUT side fourth MOS transistor Q204, the OUTPUT side sixth MOS transistor Q206 and the OUTPUT side eighth MOS transistor Q208, respectively, and the other ends are connected to an OUTPUT negative terminal OUTPUT-of the OUTPUT side line.
The INPUT end of the INPUT voltage sampling circuit is connected with the INPUT positive end INPUT + of the INPUT side circuit, the INPUT end of the OUTPUT voltage sampling circuit is connected with the OUTPUT positive end OUTPUT + of the OUTPUT side circuit, the INPUT positive end INPUT + of the INPUT side circuit and the OUTPUT positive end OUTPUT + of the OUTPUT side circuit are respectively subjected to resistance voltage division and then are changed into low-voltage signals to be OUTPUT to the four-phase interleaved control circuit; the input current detection circuit and the output current detection circuit respectively output detected current signals to the four-phase staggered control circuit, and the four-phase staggered control circuit outputs control signals to the grid electrode of the MOS tube of the four-phase staggered circuit.
As shown in fig. 3, fig. 4 and fig. 5, the output voltage Vo, the input voltage Vin, and the voltage-decreasing line when Vo < Vin are shown in the timing chart of fig. 3, which represent the characteristic that the output of the four-phase interleaved line provided by the line of the present invention can increase or decrease the voltage; when Vo > Vin is the boost line, the timing diagram is shown in FIG. 4 below; when Vo = Vin is a boost line, the timing diagram is shown in fig. 5 below.
For Vo < Vin as an example, as shown in fig. 3 below, 0-T is a PWM duty cycle, the drive signal of the input-side second MOS transistor Q102 is complementary to the drive signal of the input-side first MOS transistor Q101, when the input-side first MOS transistor Q101 is on, the input-side second MOS transistor Q102 is off, the input-side third MOS transistor Q103 is on at T/4, the input-side fourth MOS transistor Q104 is complementary to the drive signal of the input-side third MOS transistor Q103, the input-side fourth MOS transistor Q104 is off, the input-side fifth MOS transistor Q105 is on at T/2, the input-side sixth MOS transistor Q106 is complementary to the drive signal of the input-side fifth MOS transistor Q105, the input-side sixth MOS transistor Q106 is off, the input-side seventh MOS transistor Q107 is on at 3T/4, the input-side eighth MOS transistor Q108 is complementary to the drive signal of the input-side seventh MOS transistor Q107, the input-side eighth MOS transistor Q108 is off, the output-side first MOS transistor Q201, the output-side third MOS transistor Q203, The output side fifth MOS transistor Q205 and the output side seventh MOS transistor Q207 are normally on, and the output side second MOS transistor Q202, the output side fourth MOS transistor Q204, the output side sixth MOS transistor Q206 and the output side eighth MOS transistor Q208 are normally off.
Although specific implementations of the invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative and that many variations or modifications may be made to these implementations without departing from the principles and spirit of the invention. The scope of the invention is therefore defined by the appended claims.
Claims (7)
1. A four-phase interleaved circuit for a high-power switching power supply comprises an input circuit, an input current detection circuit, a four-phase interleaved circuit, an output current detection circuit, an output circuit, an input voltage sampling circuit, an output voltage sampling circuit and a four-phase interleaved control circuit, wherein the input circuit is connected with a first port of the input current detection circuit and an input end of the input voltage sampling circuit, a second port of the input current detection circuit is connected with an input port of the four-phase interleaved circuit, an output port of the four-phase interleaved circuit is connected with a first port of the output current detection circuit, a second port of the output current detection circuit is connected with input ends of the output circuit and the output voltage sampling circuit, a third port of the input current detection circuit, an output port of the input voltage sampling circuit, a third port of the output current detection circuit and an output port of the output voltage sampling circuit are respectively connected with a four-phase interleaved control circuit Four input ports of circuit, four-phase staggered control circuit output control signal for four-phase staggered circuit, its characterized in that: the circuit controls the on and off of the four-phase switch tube in the four-phase staggered circuit respectively by detecting the peak current and the peak voltage of the input circuit and the output circuit, so that the current and the voltage transmitted by the four-phase inductor in a staggered manner meet the requirement of power conversion transmission.
2. The four-phase interleaved circuit for a high power switching power supply as claimed in claim 1, wherein: the four-phase interleaved circuit comprises a four-phase inductor, an input side circuit and an output side circuit, the four-phase inductor comprises a first inductor, a second inductor, a third inductor and a fourth inductor,
the input side circuit comprises eight input side MOS tubes and eight input side diodes, wherein the input side first MOS tube and the input side second MOS tube form an input side first phase switch tube, the input side third MOS tube and the input side fourth MOS tube form an input side second phase switch tube, the input side fifth MOS tube and the input side sixth MOS tube form an input side third phase switch tube, the input side seventh MOS tube and the input side eighth MOS tube form an input side fourth phase switch tube, the source electrode of the input side first MOS tube is connected with the drain electrode of the input side second MOS tube, the anode of the input side first diode, the cathode of the input side second diode and one end of a first inductor, the source electrode of the input side third MOS tube is connected with the drain electrode of the input side fourth MOS tube, the anode of the input side third diode, the cathode of the input side fourth diode and one end of a second inductor, the source electrode of the input side fifth MOS tube is connected with the drain electrode of the input, The cathode of the input side sixth diode and one end of the third inductor, the source of the input side seventh MOS transistor is connected with the drain of the input side eighth MOS transistor, the anode of the input side seventh diode, the cathode of the input side eighth diode and one end of the fourth inductor, the cathodes of the input side first, third, fifth and seventh diodes are connected with the input positive end of the input side line, and the anodes of the input side second, fourth, sixth and eighth diodes are connected with the input negative end of the input side line;
the output side circuit comprises eight output side MOS tubes and eight output side diodes, wherein the first and second MOS tubes on the output side form a first phase switching tube on the output side, the third and fourth MOS tubes on the output side form a second phase switching tube on the output side, the fifth and sixth MOS tubes on the output side form a third phase switching tube on the output side, the seventh and eighth MOS tubes on the output side form a fourth phase switching tube on the output side, the source electrode of the first MOS tube on the output side is connected with the drain electrode of the second MOS tube on the output side, the anode of the first diode on the output side, the cathode of the second diode on the output side and the other end of the first inductor, the source electrode of the third MOS tube on the output side is connected with the drain electrode of the fourth MOS tube on the output side, the anode of the third diode on the output side, the cathode of the fourth diode on the output side and the other end of the second inductor, and the source electrode of the fifth MOS tube on the output side is connected with the drain electrode of the sixth MOS tube on the output, The cathode of the output side sixth diode and the other end of the third inductor, the source of the output side seventh MOS transistor is connected with the drain of the output side eighth MOS transistor, the anode of the output side seventh diode, the cathode of the output side eighth diode and the other end of the fourth inductor, the cathodes of the output side first, third, fifth and seventh diodes are connected with the output positive end of the output side line, and the anodes of the output side second, fourth, sixth and eighth diodes are connected with the output negative end of the output side line.
3. A four-phase interleaved circuit for a high power switching power supply as claimed in claim 2 wherein: the input current detection circuit comprises eight input side current detection circuits, each input side current detection circuit comprises a peak current detection circuit of an input side current transformer corresponding to the input side current detection circuit, one end of a primary side of each input side first, third, fifth and seventh current transformer is respectively connected with a drain electrode of the input side first MOS tube, the third MOS tube, the fifth MOS tube and the seventh MOS tube, the other end of the primary side of each input side first, third, fifth and seventh current transformer is connected with an input positive end of the input circuit, one end of the primary side of each input side second, fourth, sixth and eighth current transformer is respectively connected with a source electrode of the input side second MOS tube, the fourth MOS tube, the sixth MOS tube and the eighth MOS tube, and the other end of each input side second, fourth, sixth and eighth current.
4. A four-phase interleaved circuit for a high power switching power supply as claimed in claim 2 wherein: the output current detection circuit comprises eight output side current detection circuits, each output side current detection circuit is a peak current detection circuit comprising an output side current transformer corresponding to the output side current detection circuit, one end of a primary side of each output side first, third, fifth and seventh current transformer is respectively connected with a drain electrode of the output side first MOS tube, the third MOS tube, the fifth MOS tube and the seventh MOS tube, the other end of each output side first, third, fifth and seventh current transformer is connected with an output positive end of the output circuit, one end of a primary side of each output side second, fourth, sixth and eighth current transformer is respectively connected with a source electrode of the output side second MOS tube, the fourth MOS tube, the sixth MOS tube and the eighth MOS tube, and the other end of each output side second, fourth, sixth and eighth current transformer is connected with an output negative end of the output.
5. The four-phase interleaved circuit for a high power switching power supply as claimed in claim 1, wherein: the input voltage sampling circuit is connected with the positive end of the input circuit, and the output voltage sampling circuit is connected with the positive end of the output circuit and respectively becomes a low-voltage signal after being subjected to resistance voltage division.
6. The four-phase interleaved circuit for a high power switching power supply as claimed in claim 1, wherein: the four-phase staggered control circuit comprises a PWM chip, and the PWM chip receives current and voltage signals of an input side and an output side and outputs control signals to the grid electrodes of the MOS tubes of the four-phase staggered circuit.
7. A four-phase interleaved circuit for a high power switching power supply as claimed in claim 1 wherein: the input circuit and the output circuit adopt filter circuits formed by capacitors and inductors.
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