CN110995012A - Relay type LLC resonant topology circuit and switching power supply - Google Patents

Relay type LLC resonant topology circuit and switching power supply Download PDF

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Publication number
CN110995012A
CN110995012A CN201911368403.0A CN201911368403A CN110995012A CN 110995012 A CN110995012 A CN 110995012A CN 201911368403 A CN201911368403 A CN 201911368403A CN 110995012 A CN110995012 A CN 110995012A
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switching device
primary winding
resonant
circuit
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CN110995012B (en
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蔡旗
张旭
宋晨
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Shenzhen Invt Electric Co Ltd
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Shenzhen Invt Electric 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • H02M7/4818—Resonant converters with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a relay LLC resonant topological circuit, which comprises a transformer, a primary LLC resonant circuit and a secondary circuit. The primary side of the transformer comprises two primary side windings, and the primary side LLC resonant circuit controls the two primary side windings to alternately flow in currents in the same direction when in work, namely the currents on the primary side windings of the transformer are changed in a single direction, so that the electromagnetic noise is reduced, and the EMC optimization difficulty and the EMC optimization cost of the circuit are reduced; and the magnetic field directions generated by the two primary windings when current flows in are opposite, namely, the magnetic hysteresis loop of the transformer works in the first quadrant and the third quadrant, so that the utilization rate of the magnetic core is high. The invention also discloses a switching power supply which has the same beneficial effect as the topological circuit.

Description

Relay type LLC resonant topology circuit and switching power supply
Technical Field
The invention relates to the field of switching power supplies, in particular to a relay type LLC resonant topological circuit and a switching power supply.
Background
At present, the common basic topology circuits in the switching power supply include: flyback topology circuits, forward topology circuits, push-pull topology circuits, half-bridge topology circuits, full-bridge topology circuits, and the like. From the point of view of core utilization: of transformers in flyback and forward topologiesThe magnetic hysteresis loop only works in the first quadrant, so that the utilization rate of the magnetic core is low; and the hysteresis loops of the transformer in the push-pull type topological circuit, the half-bridge type topological circuit and the full-bridge type topological circuit work in the first quadrant and the third quadrant, so that the utilization rate of the magnetic core is high. However, the current on the primary winding of the transformer in the push-pull topology circuit, the half-bridge topology circuit and the full-bridge topology circuit varies in the positive and negative directions, i.e. the variation range of the current is-IMAX～IMAXThis results in the core power loop of the switching power supply having a current variation range of 0 to I at the same switching speed MAX2 times of the circuit, resulting in greater electromagnetic noise, thereby increasing the difficulty and cost of optimizing the EMC (Electro magnetic compatibility) of the circuit.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a relay type LLC resonant topological circuit and a switching power supply, wherein the current on a primary winding of a transformer is changed in a single direction, so that the electromagnetic noise is reduced, and the EMC optimization difficulty and cost of the circuit are reduced; and the magnetic fields generated by the two primary windings when current flows in are opposite in direction, so that the utilization rate of the magnetic core is high.
In order to solve the above technical problem, the present invention provides a relay LLC resonant topology circuit, including:
a transformer; the transformer comprises a first primary winding and a second primary winding;
the primary LLC resonant circuit is respectively connected with an input voltage source, the first primary winding and the second primary winding and is used for acquiring electric energy from the input voltage source during working so as to control the first primary winding and the second primary winding to alternately flow in current in the same direction; the first primary winding and the second primary winding generate magnetic fields with opposite directions when current flows in;
and the secondary side circuit is respectively connected with the secondary side winding of the transformer and a load and used for rectifying alternating current generated by the secondary side winding into direct current to be supplied to the load.
Preferably, the primary LLC resonant circuit includes a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the dotted end of the first primary winding, the synonym end of the first primary winding is connected with the first end of the first switching device, the second end of the first switching device is respectively connected with the first end of the resonant inductor and the synonym end of the second primary winding, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the dotted end of the second primary winding is connected with the first end of the second switching device, the second end of the second switching device is connected with the second end of the resonant capacitor, the common end of the second switching device is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
Preferably, the primary LLC resonant circuit includes a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the first end of the first switching device, the second end of the first switching device is connected with the dotted end of the first primary winding, the dotted end of the first primary winding is respectively connected with the first end of the resonant inductor and the dotted end of the second primary winding, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the dotted end of the second primary winding is connected with the first end of the second switching device, the second end of the second switching device is connected with the second end of the resonant capacitor, the common end of the second switching device is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
Preferably, the primary LLC resonant circuit includes a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the dotted end of the first primary winding, the synonym end of the first primary winding is connected with the first end of the first switching device, the second end of the first switching device is respectively connected with the first end of the resonant inductor and the first end of the second switching device, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the second end of the second switching device is connected with the synonym end of the second primary winding, the dotted end of the second primary winding is connected with the second end of the resonant capacitor, the common end of the second primary winding is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
Preferably, the primary LLC resonant circuit includes a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the first end of the first switching device, the second end of the first switching device is connected with the dotted end of the first primary winding, the dotted end of the first primary winding is respectively connected with the first end of the resonance inductor and the first end of the second switching device, the second end of the resonance inductor is connected with the first end of the resonance capacitor, the second end of the second switching device is connected with the dotted end of the second primary winding, the dotted end of the second primary winding is connected with the second end of the resonance capacitor, the common end of the second primary winding is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
Preferably, the secondary side circuit comprises a first rectifier diode, a second rectifier diode, a filter inductor and a filter capacitor; the secondary winding comprises a first secondary winding corresponding to the first primary winding and a second secondary winding corresponding to the second primary winding; wherein:
the dotted terminal of the first secondary winding is connected with the anode of the first rectifier diode, the dotted terminal of the second secondary winding is connected with the anode of the second rectifier diode, the first terminal of the filter inductor is respectively connected with the cathode of the first rectifier diode and the cathode of the second rectifier diode, the second terminal of the filter inductor is respectively connected with the first terminal of the filter capacitor and the first terminal of the load, the second terminal of the filter capacitor is connected with the second terminal of the load, and the public terminal is connected into the dotted terminal of the first secondary winding and the dotted terminal of the second secondary winding.
Preferably, a preset dead zone interval exists between a first driving signal for driving the first switching element to be switched on and off and a second driving signal for driving the second switching element to be switched on and off;
and the moments of the rising edges and the falling edges of the first driving signal and the second driving signal are respectively at the zero-crossing moments of different currents of the resonant inductor.
Preferably, the first switching device and the second switching device are both NMOS transistors with body diodes; wherein:
the drain electrode of the NMOS tube is used as the first end of the first switch device and the first end of the second switch device, the source electrode of the NMOS tube is used as the second end of the first switch device and the second switch device, and the grid electrode of the NMOS tube is used as the control end of the first switch device and the second switch device.
Preferably, the first switching device and the second switching device each include N parallel switching sub-devices, the resonant inductor includes N parallel resonator inductors, and the resonant capacitor includes N parallel resonator capacitors; wherein N is a positive integer.
In order to solve the above technical problem, the present invention further provides a switching power supply, which includes an input voltage source and any one of the above relay LLC resonant topology circuits.
The invention provides a relay LLC resonant topological circuit which comprises a transformer, a primary LLC resonant circuit and a secondary circuit. The primary side of the transformer comprises two primary side windings, and the primary side LLC resonant circuit controls the two primary side windings to alternately flow in currents in the same direction when in work, namely the currents on the primary side windings of the transformer are changed in a single direction, so that the electromagnetic noise is reduced, and the EMC optimization difficulty and the EMC optimization cost of the circuit are reduced; and the magnetic field directions generated by the two primary windings when current flows in are opposite, namely, the magnetic hysteresis loop of the transformer works in the first quadrant and the third quadrant, so that the utilization rate of the magnetic core is high.
The invention also provides a switching power supply which has the same beneficial effects as the topological circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a relay LLC resonant topology circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fourth relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 6(1) is a schematic diagram of a first stage of a relay LLC resonant topology circuit according to the embodiment of the present invention;
fig. 6(2) is a schematic diagram of a second stage of the first relay LLC resonant topology circuit according to the embodiment of the present invention;
fig. 6(3) is a schematic diagram of a third stage of the first relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 6(4) is a schematic diagram of a fourth stage of the first relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 6(5) is a schematic diagram of a fifth stage of a first relay LLC resonant topology circuit according to the embodiment of the present invention;
fig. 6(6) is a six-stage schematic diagram of a first relay LLC resonant topology circuit according to the embodiment of the present invention;
fig. 6(7) is a seventh schematic diagram of a stage of a first relay LLC resonant topology circuit according to the embodiment of the present invention;
fig. 6(8) is a schematic diagram of a stage eight of the first relay LLC resonant topology circuit provided in the embodiment of the present invention;
fig. 7 is a waveform diagram of an operation of a relay LLC resonant topology circuit according to an embodiment of the present invention.
Detailed Description
The invention has the core that a relay LLC resonance topological circuit and a switching power supply are provided, the current on the primary winding of a transformer is changed in a single direction, so that the electromagnetic noise is reduced, and the EMC optimization difficulty and the EMC optimization cost of the circuit are reduced; and the magnetic fields generated by the two primary windings when current flows in are opposite in direction, so that the utilization rate of the magnetic core is high.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a relay LLC resonant topology circuit according to an embodiment of the present invention.
The relay type LLC resonant topology circuit comprises:
a transformer T1; the transformer T1 comprises a first primary winding Np1 and a second primary winding Np 2;
the primary LLC resonant circuit 1 is respectively connected with an input voltage source Vdc, the first primary winding Np1 and the second primary winding Np2, and is used for obtaining electric energy from the input voltage source Vdc during operation so as to control the first primary winding Np1 and the second primary winding Np2 to alternately flow in currents in the same direction; the directions of magnetic fields generated by the first primary winding Np1 and the second primary winding Np2 when current flows in are opposite;
and a secondary circuit 2 connected to the secondary winding of the transformer T1 and the load Rout, respectively, for rectifying the ac power generated by the secondary winding into dc power and supplying the dc power to the load Rout.
Specifically, the relay type LLC resonant topology circuit of the present application includes transformer T1, primary LLC resonant circuit 1 and secondary circuit 2, and its working principle is:
the primary side of the transformer T1 includes two primary windings, and specifically, a center tap is added to the primary winding of the transformer T1 to divide the primary winding of the transformer T1 into a first primary winding Np1 and a second primary winding Np 2. When the primary LLC resonant circuit 1 works, electric energy is obtained from an input voltage source Vdc, and the purpose is to control the first primary winding Np1 and the second primary winding Np2 to alternately flow in currents in the same direction, namely the current on the primary winding of the transformer T1 is changed in a single direction, specifically, the primary current of the transformer T1 only flows in the positive direction, and the change range of the primary current is 0-IMAXTherefore, electromagnetic noise is reduced, and EMC optimization difficulty and cost of the circuit are reduced.
Further, the first primary winding Np1 and the second primary winding Np2, when provided, satisfy: the current of the first primary winding Np1 flows from the homonymous terminal of the first primary winding Np1 to the synonym terminal of the first primary winding Np 1; the current of the second primary winding Np2 flows from the synonym terminal of the second primary winding Np2 to the synonym terminal of the second primary winding Np2, so that the first primary winding Np1 and the second primary winding Np2 generate opposite magnetic field directions when the current flows in, that is, the hysteresis loop of the transformer T1 works in the first quadrant and the third quadrant, and the utilization rate of the magnetic core is high.
The invention provides a relay LLC resonant topological circuit which comprises a transformer, a primary LLC resonant circuit and a secondary circuit. The primary side of the transformer comprises two primary side windings, and the primary side LLC resonant circuit controls the two primary side windings to alternately flow in currents in the same direction when in work, namely the currents on the primary side windings of the transformer are changed in a single direction, so that the electromagnetic noise is reduced, and the EMC optimization difficulty and the EMC optimization cost of the circuit are reduced; and the magnetic field directions generated by the two primary windings when current flows in are opposite, namely, the magnetic hysteresis loop of the transformer works in the first quadrant and the third quadrant, so that the utilization rate of the magnetic core is high.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic structural diagram of a first relay LLC resonant topology circuit according to an embodiment of the present invention.
As an alternative embodiment, the primary LLC resonant circuit 1 includes a first switching device S1, a second switching device S2, a resonant inductor Ls, and a resonant capacitor Cs; wherein:
the positive electrode of an input voltage source Vdc is connected with the dotted terminal of a first primary winding Np1, the synonym terminal of the first primary winding Np1 is connected with the first terminal of a first switching device S1, the second terminal of the first switching device S1 is respectively connected with the first terminal of a resonant inductor Ls and the synonym terminal of a second primary winding Np2, the second terminal of the resonant inductor Ls is connected with the first terminal of a resonant capacitor Cs, the dotted terminal of the second primary winding Np2 is connected with the first terminal of a second switching device S2, the second terminal of the second switching device S2 is connected with the second terminal of the resonant capacitor Cs, the common terminal of the second switching device S1 is connected with the negative electrode of the input voltage source Vdc, and the control terminal of the first switching device S1 and the control terminal of the second switching device S2 are both connected with a driving circuit;
the driving circuit is used for controlling the first switching device S1 and the second switching device S2 to be conducted alternately when in operation so as to control the first primary winding Np1 and the second primary winding Np2 to flow in current in the same direction alternately.
It is understood that the first switching device S1 may be connected in series to the synonym terminal of the first primary winding Np1 as shown in fig. 2, or connected in series to the synonym terminal of the first primary winding Np1, and the two series connection modes operate on the same principle:
as shown in fig. 3, the primary LLC resonant circuit 1 includes a first switching device S1, a second switching device S2, a resonant inductor Ls, and a resonant capacitor Cs; wherein:
the positive electrode of an input voltage source Vdc is connected with the first end of a first switching device S1, the second end of the first switching device S1 is connected with the dotted end of a first primary winding Np1, the dotted end of the first primary winding Np1 is respectively connected with the first end of a resonant inductor Ls and the dotted end of a second primary winding Np2, the second end of the resonant inductor Ls is connected with the first end of a resonant capacitor Cs, the dotted end of the second primary winding Np2 is connected with the first end of a second switching device S2, the second end of the second switching device S2 is connected with the second end of the resonant capacitor Cs, the common end of the second primary winding Np2 is connected with the negative electrode of the input voltage source Vdc, and the control end of the first switching device S1 and the control end of the second switching device S2 are both connected with a driving circuit;
the driving circuit is used for controlling the first switching device S1 and the second switching device S2 to be conducted alternately when in operation so as to control the first primary winding Np1 and the second primary winding Np2 to flow in current in the same direction alternately.
Similarly, the second switching device S2 may be connected in series to the synonym terminal of the second primary winding Np2 or the synonym terminal of the second primary winding Np2, as shown in fig. 2, and the two series connection modes have the same operation principle:
as shown in fig. 4, the primary LLC resonant circuit 1 includes a first switching device S1, a second switching device S2, a resonant inductor Ls, and a resonant capacitor Cs; wherein:
the positive electrode of an input voltage source Vdc is connected with the dotted terminal of a first primary winding Np1, the synonym terminal of the first primary winding Np1 is connected with the first terminal of a first switching device S1, the second terminal of the first switching device S1 is respectively connected with the first terminal of a resonant inductor Ls and the first terminal of a second switching device S2, the second terminal of the resonant inductor Ls is connected with the first terminal of a resonant capacitor Cs, the second terminal of the second switching device S2 is connected with the synonym terminal of a second primary winding Np2, the dotted terminal of the second winding Np2 is connected with the second terminal of the resonant capacitor Cs, the common terminal of the dotted terminal of the second switching device S1 is connected with the negative electrode of the input voltage source Vdc, and the control terminal of the first switching device S1 and the control terminal of the second switching device S2 are both connected with a driving circuit;
the driving circuit is used for controlling the first switching device S1 and the second switching device S2 to be conducted alternately when in operation so as to control the first primary winding Np1 and the second primary winding Np2 to flow in current in the same direction alternately.
Similarly, the first switching device S1 and the second switching device S2 can both be changed to the series connection mode as shown in fig. 2, and the working principle of the two series connection modes is the same:
as shown in fig. 5, the primary LLC resonant circuit 1 includes a first switching device S1, a second switching device S2, a resonant inductor Ls, and a resonant capacitor Cs; wherein:
the positive electrode of an input voltage source Vdc is connected with the first end of a first switching device S1, the second end of the first switching device S1 is connected with the dotted end of a first primary winding Np1, the dotted end of the first primary winding Np1 is respectively connected with the first end of a resonant inductor Ls and the first end of a second switching device S2, the second end of the resonant inductor Ls is connected with the first end of a resonant capacitor Cs, the second end of the second switching device S2 is connected with the dotted end of a second primary winding Np2, the dotted end of the second primary winding Np2 is connected with the second end of the resonant capacitor Cs, the common end of the dotted end of the second primary winding Np2 is connected with the negative electrode of the input voltage source Vdc, and the control end of the first switching device S1 and the control end of the second switching device S2 are both connected with a driving circuit;
the driving circuit is used for controlling the first switching device S1 and the second switching device S2 to be conducted alternately when in operation so as to control the first primary winding Np1 and the second primary winding Np2 to flow in current in the same direction alternately.
It should be noted that a preset dead zone interval exists between the first driving signal for driving the first switching device S1 to turn on and off and the second driving signal for driving the second switching device S2 to turn on and off, so as to prevent the first switching device S1 and the second switching device S2 from simultaneously acting to affect the circuit working performance; in addition, the moments of the rising edge and the falling edge of the first driving signal and the second driving signal are respectively at the different current zero crossing moments of the resonant inductor Ls, so that the switching loss is reduced through a zero-current on-off soft switching technology, and the efficiency of the whole machine is improved.
More specifically, the first switching device S1 and the second switching device S2 may both be NMOS transistors with body diodes; wherein: the drain of the NMOS transistor serves as the first terminal of the first switching device S1 and the second switching device S2, the source of the NMOS transistor serves as the second terminal of the first switching device S1 and the second switching device S2, and the gate of the NMOS transistor serves as the control terminal of the first switching device S1 and the second switching device S2.
In addition, the first switching device S1, the second switching device S2, the resonant inductor Ls and the resonant capacitor Cs may be formed by connecting a plurality of devices of the same type in parallel, that is, the first switching device S1 and the second switching device S2 each include a plurality of parallel-connected switching sub-devices, the resonant inductor Ls includes a plurality of parallel-connected resonator inductors, and the resonant capacitor Cs includes a plurality of parallel-connected resonator capacitors.
Based on the four relay type LLC resonant topology circuits, the secondary circuits 2 have the same structure, as shown in fig. 2-5, the secondary circuits 2 each include a first rectifier diode D1, a second rectifier diode D2, a filter inductor Lout, and a filter capacitor Cout; the secondary winding of the transformer T1 comprises a first secondary winding Ns1 corresponding to the first primary winding Np1 and a second secondary winding Ns2 corresponding to the second primary winding Np 2; wherein:
the dotted terminal of the first secondary winding Ns1 is connected to the anode of the first rectifier diode D1, the dotted terminal of the second secondary winding Ns2 is connected to the anode of the second rectifier diode D2, the first terminal of the filter inductor Lout is connected to the cathode of the first rectifier diode D1 and the cathode of the second rectifier diode D2, the second terminal of the filter inductor Lout is connected to the first terminal of the filter capacitor Cout and the first terminal of the load Rout, the second terminal of the filter capacitor Cout is connected to the second terminal of the load Rout, and the common terminal is connected to the dotted terminal of the first secondary winding Ns1 and the dotted terminal of the second secondary winding Ns 2.
With reference to fig. 7, a periodic operation principle of the relay LLC resonant topology circuit is described with reference to the relay LLC resonant topology circuit in fig. 2 as an example (the operation principle of the remaining relay LLC resonant topology circuits can be described with reference to the operation principle of fig. 2):
at time (t0-t1), referring to fig. 6 (1): at time t0, the current I at the resonant inductor LsLSTo 0, the first switching device S1 begins to conduct (V of fig. 7)GS1For the first drive signal, V, for switching the first switching device S1 on and offGS2For the second drive signal for switching the second switching device S2 on and off, IS1Is the current of the first switching device S1, IS2Current of the second switching device S2), i.e., the first switching device S1 achieves zero current conduction. Charging resonant capacitor Cs by input voltage source Vdc, and current I on resonant inductor LsLSAnd also gradually increases from zero. Since the parasitic capacitance of the first switching device S1 starts to discharge, the drain-source voltage V of the first switching device S1DS1Gradually decreases, and the voltage V between the drain and the source of the second switching device S2DS2Gradually rising. At the same time, the first rectifying diode D1 of the secondary circuit 2 is in a conducting state, and the second rectifying diode D2 (I of fig. 7)D1Is the current of the first rectifying diode D1, ID2Current of the second rectifying diode D2) is in a reverse cut-off state. At this stage, the input voltage source Vdc delivers electric energy to the secondary side circuit 2 through the transformer T1 (high frequency transformer), so that the secondary side circuit 2 supplies electric energy to the load Rout.
At time (t1-t2), referring to fig. 6 (2): at time t1, the parasitic capacitance of the first switching device S1 is completely discharged, so the drain-source voltage V of the first switching device S1DS1Dropping to zero, the drain-source voltage V of the second switching device S2DS2Up to the output voltage of the input voltage source Vdc. The first switching device S1 is still conducting and the input voltage sourceVdc continuously charges the resonant capacitor Cs. As the voltage across the resonant capacitor Cs gradually rises, the current I on the resonant inductor LsLSShowing a tendency of first increasing gradually and then decreasing gradually. The drain-source voltage V of the first switching device S1 and the second switching device S2DS1、VDS2Remain unchanged. At time t2, the current I at the resonant inductor LsLSIs reduced to 0. The first rectifying diode D1 of the secondary side circuit 2 is in a conducting state, and the second rectifying diode D2 is in a reverse blocking state. At this stage, the input voltage source Vdc delivers power to the secondary side circuit 2 through the transformer T1, so that the secondary side circuit 2 continues to supply power to the load Rout.
At time (t2-t3), referring to fig. 6 (3): at time t2, the current I at the resonant inductor LsLSTo 0, the first switching device S1 is turned off, i.e., the first switching device S1 achieves a zero current turn-off. At this time, the input voltage source Vdc charges the parasitic capacitance of the first switching device S1. The drain-source voltage V of the first switching device S1DS1Gradually rises, and the voltage V between the drain and the source of the second switching device S2DS2Gradually decreases. At this stage, the filter capacitor Cout of the secondary circuit 2 supplies electric energy to the load Rout.
At time (t3-t4), referring to fig. 6 (4): at time t3, the parasitic capacitor of the first switching device S1 is charged completely, the first switching device S1 and the second switching device S2 are both in an off state, and the current I on the resonant inductor Ls isLS0, the drain-source voltage V of the first switching device S1 and the second switching device S2DS1、VDS2Remain unchanged. At this stage, the filter capacitor Cout of the secondary side circuit 2 continues to supply power to the load Rout.
At time (t4-t5), referring to fig. 6 (5): at time t4, the current I at the resonant inductor LsLSTo 0, the second switching device S2 begins to conduct, i.e., the second switching device S2 achieves zero current conduction. The resonant capacitor Cs starts to release energy, and the current I on the resonant inductor LsLSAnd gradually increases from zero in the opposite direction. Since the parasitic capacitance of the second switching device S2 starts to discharge, the drain-source voltage V of the first switching device S1DS1Gradually rises, and the voltage V between the drain and the source of the second switching device S2DS2Gradually decreases. At the same time, the first rectifying diode D1 of the secondary circuit 2 is in the reverse blocking state, and the second rectifying diode D2 is in the conducting state. At this stage, the resonant capacitor Cs and the resonant inductor Ls transfer the electric energy to the secondary circuit 2 through the transformer T1, so that the secondary circuit 2 continues to supply the electric energy to the load Rout.
At time (t5-t6), referring to fig. 6 (6): at time t5, the parasitic capacitance of the second switching device S2 is completely discharged. Since the second switching device S2 is in the conducting state, the current I at the resonant inductor LsLSThe reverse increase is continued, and the trend of gradually increasing and then gradually decreasing is shown. The first rectifying diode D1 of the secondary side circuit 2 is in a reverse blocking state, and the second rectifying diode D2 is in a conducting state. At this stage, the resonant capacitor Cs and the resonant inductor Ls continue to deliver power to the secondary circuit 2 through the transformer T1, so that the secondary circuit 2 continues to provide power to the load Rout.
At time (t6-t7), referring to fig. 6 (7): at time t6, the current I at the resonant inductor LsLSTo 0, the second switching device S2 is turned off, i.e., the second switching device S2 achieves zero current turn-off. At this time, the input voltage source Vdc charges the parasitic capacitance of the second switching device S2. The drain-source voltage V of the first switching device S1DS1Gradually decreases, and the voltage V between the drain and the source of the second switching device S2DS2Gradually rising. At this stage, the filter capacitor Cout of the secondary circuit 2 supplies electric energy to the load Rout.
At time (t7-t8), referring to fig. 6 (7): at time t7, the parasitic capacitor of the second switching device S2 is charged completely, the first switching device S1 and the second switching device S2 are both in an off state, and the current I on the resonant inductor Ls isLS0, the drain-source voltage V of the first switching device S1 and the second switching device S2DS1、VDS2Remain unchanged. At this stage, the filter capacitor Cout of the secondary side circuit 2 continues to supply power to the load Rout.
The application also provides a switching power supply which comprises an input voltage source and any one of the relay type LLC resonant topology circuits.
For introduction of the switching power supply provided in the present application, please refer to the above embodiment of the relay LLC resonant topology circuit, which is not described herein again.
It is further noted that, in the present specification, 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 a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A repeating LLC resonant topology circuit, comprising:
a transformer; the transformer comprises a first primary winding and a second primary winding;
the primary LLC resonant circuit is respectively connected with an input voltage source, the first primary winding and the second primary winding and is used for acquiring electric energy from the input voltage source during working so as to control the first primary winding and the second primary winding to alternately flow in current in the same direction; the first primary winding and the second primary winding generate magnetic fields with opposite directions when current flows in;
and the secondary side circuit is respectively connected with the secondary side winding of the transformer and a load and used for rectifying alternating current generated by the secondary side winding into direct current to be supplied to the load.
2. The relay LLC resonant topology circuit of claim 1, wherein said primary LLC resonant circuit comprises a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the dotted end of the first primary winding, the synonym end of the first primary winding is connected with the first end of the first switching device, the second end of the first switching device is respectively connected with the first end of the resonant inductor and the synonym end of the second primary winding, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the dotted end of the second primary winding is connected with the first end of the second switching device, the second end of the second switching device is connected with the second end of the resonant capacitor, the common end of the second switching device is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
3. The relay LLC resonant topology circuit of claim 1, wherein said primary LLC resonant circuit comprises a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the first end of the first switching device, the second end of the first switching device is connected with the dotted end of the first primary winding, the dotted end of the first primary winding is respectively connected with the first end of the resonant inductor and the dotted end of the second primary winding, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the dotted end of the second primary winding is connected with the first end of the second switching device, the second end of the second switching device is connected with the second end of the resonant capacitor, the common end of the second switching device is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
4. The relay LLC resonant topology circuit of claim 1, wherein said primary LLC resonant circuit comprises a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the dotted end of the first primary winding, the synonym end of the first primary winding is connected with the first end of the first switching device, the second end of the first switching device is respectively connected with the first end of the resonant inductor and the first end of the second switching device, the second end of the resonant inductor is connected with the first end of the resonant capacitor, the second end of the second switching device is connected with the synonym end of the second primary winding, the dotted end of the second primary winding is connected with the second end of the resonant capacitor, the common end of the second primary winding is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
5. The relay LLC resonant topology circuit of claim 1, wherein said primary LLC resonant circuit comprises a first switching device, a second switching device, a resonant inductor, and a resonant capacitor; wherein:
the positive electrode of the input voltage source is connected with the first end of the first switching device, the second end of the first switching device is connected with the dotted end of the first primary winding, the dotted end of the first primary winding is respectively connected with the first end of the resonance inductor and the first end of the second switching device, the second end of the resonance inductor is connected with the first end of the resonance capacitor, the second end of the second switching device is connected with the dotted end of the second primary winding, the dotted end of the second primary winding is connected with the second end of the resonance capacitor, the common end of the second primary winding is connected with the negative electrode of the input voltage source, and the control end of the first switching device and the control end of the second switching device are both connected with the driving circuit;
the driving circuit is used for controlling the first switching device and the second switching device to be conducted alternately when the driving circuit works so as to control the first primary winding and the second primary winding to flow in current in the same direction alternately.
6. The relay LLC resonant topology circuit according to any of claims 2-5, wherein said secondary side circuit comprises a first rectifying diode, a second rectifying diode, a filter inductor and a filter capacitor; the secondary winding comprises a first secondary winding corresponding to the first primary winding and a second secondary winding corresponding to the second primary winding; wherein:
the dotted terminal of the first secondary winding is connected with the anode of the first rectifier diode, the dotted terminal of the second secondary winding is connected with the anode of the second rectifier diode, the first terminal of the filter inductor is respectively connected with the cathode of the first rectifier diode and the cathode of the second rectifier diode, the second terminal of the filter inductor is respectively connected with the first terminal of the filter capacitor and the first terminal of the load, the second terminal of the filter capacitor is connected with the second terminal of the load, and the public terminal is connected into the dotted terminal of the first secondary winding and the dotted terminal of the second secondary winding.
7. The relay LLC resonant topology circuit of claim 6, wherein a preset dead band interval exists between a first drive signal for switching said first switching device on and off and a second drive signal for switching said second switching device on and off;
and the moments of the rising edges and the falling edges of the first driving signal and the second driving signal are respectively at the zero-crossing moments of different currents of the resonant inductor.
8. The relay LLC resonant topology circuit of claim 6, wherein said first switching device and said second switching device are both NMOS transistors with body diodes; wherein:
the drain electrode of the NMOS tube is used as the first end of the first switch device and the first end of the second switch device, the source electrode of the NMOS tube is used as the second end of the first switch device and the second switch device, and the grid electrode of the NMOS tube is used as the control end of the first switch device and the second switch device.
9. The relay LLC resonant topology circuit of claim 6, wherein said first switching device and said second switching device each comprise N parallel switch sub-devices, said resonant inductance comprising N parallel resonator sub-inductances, said resonant capacitance comprising N parallel resonator sub-capacitances; wherein N is a positive integer.
10. A switching power supply comprising an input voltage source and a repeating LLC resonant topology circuit as claimed in any one of claims 1-9.
CN201911368403.0A 2019-12-26 2019-12-26 Relay type LLC resonant topology circuit and switching power supply Active CN110995012B (en)

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