CN210327383U - Soft switch direct current converter based on coupling inductance - Google Patents
Soft switch direct current converter based on coupling inductance Download PDFInfo
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- CN210327383U CN210327383U CN201921722134.9U CN201921722134U CN210327383U CN 210327383 U CN210327383 U CN 210327383U CN 201921722134 U CN201921722134 U CN 201921722134U CN 210327383 U CN210327383 U CN 210327383U
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Abstract
The utility model provides a soft switch DC converter based on coupling inductance, which comprises a main circuit and a resonance buffer sub-circuit; one end of the inductor L1 is connected with the positive electrode of the power supply DCin, and the other end of the inductor L1 is connected with one end of the capacitor Cr, the synonym ends of the inductors L2a and L2b, the cathode of the diode D1, one end of the capacitor Cr1 and the anode of the diode Dm; the same name of the inductor L2b is connected with the anode of a diode D2, and the cathode of a diode D2 is connected with the other end of the capacitor Cr and the anode of a diode D3; the cathode of the diode D3 is connected with the cathode of the diode Dm, one end of the capacitor C1 and one end of the load R; the same name of the inductor L2a is connected with one end of the switch S1, the anode of the diode D1 and the cathode of the diode Ds; the other end of the switch S1 is connected with the anode of the diode Ds, the other end of the capacitor Cr1, the other end of the capacitor C1 and the other end of the load R, and is used for being connected with the negative electrode of the power supply DCin; the control terminal of the switch S1 receives the control signal. The utility model discloses show the break-make loss and the current-voltage impact that reduce the switch.
Description
Technical Field
The utility model relates to a direct current converter circuit suitable for switching power supply, especially a soft switch direct current converter based on coupling inductance.
Background
At present, a Boost converter regulated and controlled by a PWM (pulse width modulation) mode is widely applied to various industrial fields of aerospace, automobiles, ships and the like. As such converters are becoming lighter and their switching frequencies are increasing, the efficiency gradually decreases. The more pronounced the electromagnetic noise is at the switching instant. The soft switching technology can well solve the two problems. The soft switch structure proposed in recent years solves the above contradiction to some extent, and the effect is not ideal. Some converters introduce an auxiliary switch to realize soft on or soft off, but have the problems of incomplete soft switching, large voltage and current stress, complex topological structure and control logic and the like.
Disclosure of Invention
To the not enough that exists among the prior art, the utility model provides a soft switch direct Current converter based on coupling inductance, ZCS (zero Current switching) is opened and ZVS (zero volt switching) is turn-off can be accomplished to the main circuit, is showing the break-make loss and the Current-voltage impact that reduce the switch. The utility model adopts the technical proposal that:
a soft switching direct current converter based on coupling inductance comprises a main circuit and a resonance buffer sub-circuit;
the main circuit comprises an inductor L1, a switch S1, diodes Ds and Dm and a capacitor C1;
the resonance buffer sub-circuit comprises coupled inductors L2a and L2b, and capacitors Cr and Cr1, diodes D1, D2 and D3;
one end of the inductor L1 is connected with the positive electrode of the power supply DCin, and the other end of the inductor L1 is connected with one end of the capacitor Cr, the synonym ends of the inductors L2a and L2b, the cathode of the diode D1, one end of the capacitor Cr1 and the anode of the diode Dm; the same name of the inductor L2b is connected with the anode of a diode D2, and the cathode of a diode D2 is connected with the other end of the capacitor Cr and the anode of a diode D3; the cathode of the diode D3 is connected with the cathode of the diode Dm, one end of the capacitor C1 and one end of the load R;
the same name of the inductor L2a is connected with one end of the switch S1, the anode of the diode D1 and the cathode of the diode Ds;
the other end of the switch S1 is connected with the anode of the diode Ds, the other end of the capacitor Cr1, the other end of the capacitor C1 and the other end of the load R, and is used for being connected with the negative electrode of the power supply DCin; the control terminal of the switch S1 receives the control signal.
Further, the switch S1 employs an NMOS transistor, the gate of which is the control terminal of S1, the drain of which is one terminal of S1, and the source of which is the other terminal of S1.
The utility model has the advantages that:
① has simple structure and easy realization of light weight.
② no need of active auxiliary device, high load adaptability and high reliability.
③ the semiconductor devices of the converter realize soft switching operation, and can effectively reduce circuit loss.
④ and the converter can compensate the excess resonance energy to the load, thereby improving the efficiency.
Drawings
Fig. 1 is a circuit topology diagram of the present invention.
Fig. 2 is an equivalent circuit diagram of each mode of the present invention.
Detailed Description
The invention is further described with reference to the following specific drawings and examples.
As shown in fig. 1, the soft switching dc converter based on coupling inductor of the present invention is a soft switching boost converter, which includes a main circuit and a resonant snubber sub-circuit;
the main circuit comprises an inductor L1, a switch S1, diodes Ds and Dm and a capacitor C1;
the resonance buffer sub-circuit comprises coupled inductors L2a and L2b, and capacitors Cr and Cr1, diodes D1, D2 and D3; the boost converter is used for realizing the operation of the boost converter in a soft switching state;
one end of the inductor L1 is connected with the positive electrode of the power supply DCin, and the other end of the inductor L1 is connected with one end of the capacitor Cr, the synonym ends of the inductors L2a and L2b, the cathode of the diode D1, one end of the capacitor Cr1 and the anode of the diode Dm; the same name of the inductor L2b is connected with the anode of a diode D2, and the cathode of a diode D2 is connected with the other end of the capacitor Cr and the anode of a diode D3; the cathode of the diode D3 is connected with the cathode of the diode Dm, one end of the capacitor C1 and one end of the load R;
the same name of the inductor L2a is connected with one end of the switch S1, the anode of the diode D1 and the cathode of the diode Ds;
the other end of the switch S1 is connected with the anode of the diode Ds, the other end of the capacitor Cr1, the other end of the capacitor C1 and the other end of the load R, and is used for being connected with the negative electrode of the power supply DCin; the control terminal of the switch S1 receives the control signal.
The switch S1 may be an NMOS transistor, with the gate of the NMOS transistor serving as the control terminal of S1, the drain serving as one terminal of S1, and the source serving as the other terminal of S1.
By selecting appropriate electrical parameters and appropriate operating frequency, the boost converter can realize soft switching process with 7 modes as period as shown in fig. 2.
When the topology of the boost converter is in operation, as shown in fig. 2, there are 7 operating modes during one on-off cycle of the switch S1.
The operation of each mode will be described below with reference to fig. 2, in which the light-colored device in fig. 2 is in the on state;
mode 1(t 0. ltoreq. t < t 1) A
Before mode 1 arrives, switch S1 is in an off state and diode Dm is turned on to energize the load. And entering the mode 1 at the moment of t0, at the moment, the switch S1 is turned on by being given an on signal, the coupling inductor L2b charges Cr, and the L2a discharges Cr 1. Due to the resonant action of L2a, the current in S1 in series with L2a cannot change, thus achieving zero current turn on (ZCS).
Mode 2 (t 1. ltoreq. t < t 2) B
In mode 2, when Cr and Cr1 are charged and discharged, respectively, the leakage current of L2a will decay rapidly because the diode Dm is turned off.
Mode 3 (t 2. ltoreq. t < t 3) C
The mode is a conventional mode of the switch-on state of the Boost circuit, namely the resonant buffer sub-circuit does not participate in the work. In this mode, the power supply forms a loop with the main inductor L1 through the switch S1, and the load R is separately held in voltage and supplied by the voltage-stabilizing capacitor C1.
Mode 4 (t 3. ltoreq. t < t 4) D
When the switch S1 is closed, the leakage inductance current in L2a will be discharged through D1, which discharge loop makes Cr1 equivalently parallel across S1. On the other hand, the power supply and L1 charge the capacitor Cr 1. The existence of Cr1 ensures that the voltage at two ends of the capacitor cannot change, so the voltage is clamped by Cr1 when S1 is turned off, and approximate ZVS is realized. When Cr1 is charged to the output voltage at the end of this mode, Dm achieves soft-on (ZVS).
Mode 5(t 4. ltoreq. t < t 5) E
In the last mode, because S1 is turned off, the magnetic energy generated in L2a cannot be discharged in a current manner in the branch, but is transferred to L2b by the coupling effect and is discharged in L2b by the current manner, a part of the energy directly flows into the load, and the leakage inductance current (current formed without participating in inductive coupling) in L2a is rapidly attenuated by D1.
Mode 6(t 5. ltoreq. t < t 6) F
The small remaining portion of the energy in L2b will continue to flow to the load until the decay is zero.
Mode 7(t 6. ltoreq. t < t 7) G
This mode is another conventional mode of a conventional boost circuit, and as such the resonant buffer sub-circuit does not participate in the operation. At this time, the switch tube S1 is in the off state, the power supply and the inductor L1 supply power to the load and the voltage-stabilizing capacitor together through Dm, and the load and the voltage-stabilizing capacitor obtain a voltage higher than that of the power supply to complete boosting (boost) due to the induced voltage of the inductor L1. When the next on signal arrives, the next clock cycle begins.
The topological structure and feasibility of the circuit are verified by simulation software PSpice and matlab, and the simulation result is consistent with theoretical analysis.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (2)
1. A soft switching direct current converter based on coupling inductance is characterized by comprising a main circuit and a resonant buffer sub-circuit;
the main circuit comprises an inductor L1, a switch S1, diodes Ds and Dm and a capacitor C1;
the resonance buffer sub-circuit comprises coupled inductors L2a and L2b, and capacitors Cr and Cr1, diodes D1, D2 and D3;
one end of the inductor L1 is connected with the positive electrode of the power supply DCin, and the other end of the inductor L1 is connected with one end of the capacitor Cr, the synonym ends of the inductors L2a and L2b, the cathode of the diode D1, one end of the capacitor Cr1 and the anode of the diode Dm; the same name of the inductor L2b is connected with the anode of a diode D2, and the cathode of a diode D2 is connected with the other end of the capacitor Cr and the anode of a diode D3; the cathode of the diode D3 is connected with the cathode of the diode Dm, one end of the capacitor C1 and one end of the load R;
the same name of the inductor L2a is connected with one end of the switch S1, the anode of the diode D1 and the cathode of the diode Ds;
the other end of the switch S1 is connected with the anode of the diode Ds, the other end of the capacitor Cr1, the other end of the capacitor C1 and the other end of the load R, and is used for being connected with the negative electrode of the power supply DCin; the control terminal of the switch S1 receives the control signal.
2. The coupled-inductor based soft-switched DC converter of claim 1,
the switch S1 employs an NMOS transistor, the gate of which is the control terminal of S1, the drain of which is one terminal of S1, and the source of which is the other terminal of S1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572030A (en) * | 2019-10-15 | 2019-12-13 | 无锡威孚高科技集团股份有限公司 | Soft switch direct current converter based on coupling inductance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572030A (en) * | 2019-10-15 | 2019-12-13 | 无锡威孚高科技集团股份有限公司 | Soft switch direct current converter based on coupling inductance |
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Inventor after: Qian Wei Inventor after: Zhang Qi Inventor after: Ma Tengfei Inventor after: Chen Fangyuan Inventor before: Qian Wei Inventor before: Zhang Qi Inventor before: Ma Tengfei Inventor before: Chen Fangyuan |