CN212163172U

CN212163172U - Resonance driving circuit

Info

Publication number: CN212163172U
Application number: CN202020809387.6U
Authority: CN
Inventors: 龚晟; 吴定祥
Original assignee: Changsha Zhihuixin Intelligent Technology Co ltd
Current assignee: Changsha Zhihuixin Intelligent Technology Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-12-15
Anticipated expiration: 2030-05-15

Abstract

The utility model provides a resonance drive circuit, including positive and negative rectangular wave power, nonlinear resonance inductance, primary, secondary, switch tube MOS, positive and negative rectangular wave power, nonlinear resonance inductance and primary series connection, the gate level of secondary one end and switch tube MOS is connected, the secondary other end is connected with the source electrode of switch tube MOS, primary and secondary wind constitute the transformer on same magnetic core, the beneficial effects of the utility model reside in that: the traditional sine wave resonant drive is improved, and most of drive energy returns to a power supply due to the resonant drive, so that the drive efficiency is high; meanwhile, the current of the resonant current is very low in most of the time in a resonant period, so that the conduction loss of the driving circuit is small; and when the inductor is saturated, the resonant frequency is very high, so that the rising rate of the driving voltage is higher than that of the traditional sine wave resonant driving, the effective duty ratio is improved, and the efficiency of the power converter is improved.

Description

Resonance driving circuit

[ technical field ] A method for producing a semiconductor device

The utility model relates to a switching power supply field especially relates to a resonance drive circuit.

[ background of the invention ]

With the development of the switching power supply technology, high frequency and high power density are the development trend of a power converter, the switching frequency reaches the MHz grade, the driving loss of a traditional rectangular wave driving circuit is large, the efficiency of the power converter is seriously influenced, low-loss resonant driving needs to be adopted, the traditional resonant driving circuit generates sine wave voltage through a resonant capacitor and a resonant inductor, the sine wave frequency is resonant frequency, the driving circuit is low in effective duty ratio due to the fact that the driving voltage is sine wave, the efficiency of the converter is influenced, the switching frequency needs to be matched with the resonant frequency of the driving circuit, and when components of the resonant circuit deviate from typical values, the resonant frequency deviates from the switching frequency to some extent, and therefore the power consumption of the driving circuit is increased.

[ Utility model ] content

An object of the present invention is to solve the above problems of the conventional rectangular wave driving circuit, and to provide a resonant driving circuit.

The utility model discloses a realize through following technical scheme: a resonance driving circuit comprises a positive rectangular wave power supply, a negative rectangular wave power supply, a nonlinear resonance inductor, a primary winding, a secondary winding and a switching tube MOS, wherein the positive rectangular wave power supply, the negative rectangular wave power supply, the nonlinear resonance inductor and the primary winding are connected in series, one end of the secondary winding is connected with the gate electrode of the switching tube MOS, the other end of the secondary winding is connected with the source electrode of the switching tube MOS, and the primary winding and the secondary winding are wound on the same magnetic core to form a transformer.

Further, the positive and negative rectangular wave power supply is realized through a full-bridge topology, a half-bridge topology, a push-pull topology or an active clamping forward topology.

Further, the positive and negative rectangular wave duty ratio of the positive and negative rectangular wave power supply is a fixed duty ratio or an adjustable duty ratio.

Further, the nonlinear resonance inductor is a fast saturation inductor, the saturation current of the nonlinear resonance inductor is less than 1.571A, and the typical inductance before saturation is 2.718 times or more than 2.718 times of the typical inductance after saturation.

Further, the secondary windings of the transformer may be two or more.

Further, the driving voltage of the switching tube MOS is an approximate positive-negative square wave composed of a resonance waveform.

The operation principle of a resonant drive circuit, the voltage source output is positive and negative square waves, provide the resonance energy, the non-linear inductance saturation current is low, when reaching the saturation current, the inductance is reduced rapidly and resonates with the capacitance Ciss of the switching tube MOS and the line distribution capacitance of the circuit, the resonance frequency is high, the grid voltage of the switching tube MOS rises rapidly to turn on, form the rising edge of the turn-on of the switching tube MOS; when the inductor resonant current is reduced to be below the saturation current, the nonlinear inductor is out of saturation, the inductance value is recovered to a certain value, and the nonlinear inductor continues to resonate with a capacitor Ciss of the switch tube MOS and a line distribution capacitor, at the moment, the resonant frequency is low, the current of a driving loop is small, and the switching-on time of the switch tube MOS is formed; when the resonant current reversely reaches the inductor saturation current value, the inductance of the inductor is rapidly reduced and resonates with the capacitor Ciss of the switching tube MOS and the line distribution capacitor, and the resonant frequency is high, so that the grid voltage of the switching tube MOS is rapidly reduced to turn off, and a falling edge of the turn-off of the switching tube MOS is formed.

The beneficial effects of the utility model reside in that: the traditional sine wave resonant drive is improved, and most of drive energy returns to a power supply due to the resonant drive, so that the drive efficiency is high; meanwhile, the current of the resonant current is very low in most of the time in a resonant period, so that the conduction loss of the driving circuit is small; and when the inductor is saturated, the resonant frequency is very high, so that the rising rate of the driving voltage is higher than that of the traditional sine wave resonant driving, the effective duty ratio is improved, and the efficiency of the power converter is improved.

[ description of the drawings ]

Fig. 1 is a schematic diagram of two resonant driving structures with capacitance matching for a resonant driving circuit according to the present invention;

fig. 2 is a schematic diagram of a full-bridge driving structure of a resonant driving circuit according to the present invention;

fig. 3 is a schematic diagram of a half-bridge driving structure of a resonant driving circuit according to the present invention;

fig. 4 is a schematic diagram of two resonant driving structures of a resonant driving circuit of the present invention;

fig. 5 is a schematic diagram of a resonant driving structure of a plurality of switching devices of a resonant driving circuit according to the present invention;

reference numerals: 1. a positive and negative rectangular wave power supply; 2. a non-linear resonant inductor; 3. a primary winding; 4. a secondary winding; 5. a switching tube MOS; 6. a magnetic core; 7. a transformer.

[ detailed description ] embodiments

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1, 2, 3, 4, and 5, a resonant driving circuit includes a positive and negative rectangular wave power supply 1, a non-linear resonant inductor 2, a primary winding 3, a secondary winding 4, and a switching tube MOS5, where the positive and negative rectangular wave power supply 1, the non-linear resonant inductor 2, and the primary winding 3 are connected in series, one end of the secondary winding 4 is connected to a gate of the switching tube MOS5, the other end of the secondary winding 4 is connected to a source of the switching tube MOS5, and the primary winding 3 and the secondary winding 4 form a transformer 7 on the same magnetic core 6.

Preferably, the positive and negative rectangular wave power supply 1 is implemented by a full-bridge topology, a half-bridge topology, a push-pull topology or an active clamp forward topology.

Preferably, the positive and negative rectangular wave duty ratio of the positive and negative rectangular wave power supply 1 is a fixed duty ratio or an adjustable duty ratio.

Preferably, the nonlinear resonant inductor 2 is a fast saturation inductor, the saturation current of the nonlinear resonant inductor 2 is less than 1.571A, and the typical inductance before saturation is 2.718 times or more than 2.718 times of the typical inductance after saturation.

Preferably, the secondary winding 4 of the transformer 7 may be two or more.

Preferably, the driving voltage of the switching tube MOS5 is an approximately positive-negative square wave composed of a resonant waveform.

Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A resonant drive circuit, characterized by: the transformer comprises a positive rectangular wave power supply, a negative rectangular wave power supply, a nonlinear resonance inductor, a primary winding, a secondary winding and a switching tube MOS, wherein the positive rectangular wave power supply, the negative rectangular wave power supply, the nonlinear resonance inductor and the primary winding are connected in series, one end of the secondary winding is connected with the gate of the switching tube MOS, the other end of the secondary winding is connected with the source of the switching tube MOS, and the primary winding and the secondary winding are wound on the same magnetic core to form the transformer.

2. A resonant drive circuit according to claim 1, wherein: the positive and negative rectangular wave power supply is realized through a full-bridge topology, a half-bridge topology, a push-pull topology or an active clamping forward topology.

3. A resonant drive circuit according to claim 1, wherein: the positive and negative rectangular wave duty ratio of the positive and negative rectangular wave power supply is a fixed duty ratio or an adjustable duty ratio.

4. A resonant drive circuit according to claim 1, wherein: the nonlinear resonance inductor is a rapid saturated inductor, the saturation current of the nonlinear resonance inductor is less than 1.571A, and the typical inductance before saturation is 2.718 times or more than 2.718 times of the typical inductance after saturation.

5. A resonant drive circuit according to claim 1, wherein: the secondary windings of the transformer may be two or more.

6. A resonant drive circuit according to claim 1, wherein: the driving voltage of the MOS of the switching tube is an approximate positive-negative square wave formed by resonance waveforms.