阅读说明：本技术 Llc谐振电路 (LL C resonant circuit ) 是由 黎文权 梁舒展 刘旭明 刘祥发 雷爽 于 2020-04-03 设计创作，主要内容包括：本发明适用于开关电源技术领域,提供了一种LLC谐振电路,包括：采样模块、调理模块和控制器；控制模块、第一全桥模块、第二全桥模块、第一谐振模块、第二谐振模块、第一变压器、第二变压器和整流输出模块,当控制模块控制第一全桥模块和第二全桥模块同时工作时,整流输出模块输出高电压；当控制模块控制第一全桥模块工作,且控制第二全桥模块不工作时,整流输出模块输出低电压。本发明能够实现宽范围输出,无需额外增加继电器,可以避免继电器投切带来的可靠性隐患以及高低压切换时导致的输出掉电现象,且降低器件成本；在低压输出时,第一全桥模块的开关频率无需设置太高,可以有效优化低压输出时的输出电压纹波和稳压精度指标。(The invention is suitable for the technical field of switching power supplies, and provides an LL C resonant circuit which comprises a sampling module, a conditioning module and a controller, wherein the control module, a first full-bridge module, a second full-bridge module, a first resonant module, a second resonant module, a first transformer, a second transformer and a rectification output module, when the control module controls the first full-bridge module and the second full-bridge module to work simultaneously, the rectification output module outputs high voltage, and when the control module controls the first full-bridge module to work and controls the second full-bridge module to not work, the rectification output module outputs low voltage.)

1. An LL C resonance circuit is characterized by comprising a control module, a first full-bridge module, a second full-bridge module, a first resonance module, a second resonance module, a first transformer, a second transformer and a rectification output module;

in the first full-bridge module, a first input end is connected with the positive bus, a second input end is connected with the negative bus, a third input end is connected with the control module, a first output end is connected with a first input end of the first resonance module, and a second output end is connected with a second input end of the first resonance module;

the first transformer has a first primary side end connected with the first output end of the first resonance module, a second primary side end connected with the second output end of the first resonance module, a first secondary side end connected with the first input end of the rectification output module, and a second secondary side end connected with the second input end of the rectification output module;

the first input end of the second full-bridge module is connected with the positive bus, the second input end of the second full-bridge module is connected with the negative bus, the third input end of the second full-bridge module is connected with the control module, the first output end of the second full-bridge module is connected with the first input end of the second resonance module, and the second output end of the second full-bridge module is connected with the second input end of the second resonance module;

the first end of the primary side of the second transformer is connected with the first output end of the second resonance module, the second end of the primary side of the second transformer is connected with the second output end of the second resonance module, the first end of the secondary side of the second transformer is connected with the third input end of the rectification output module, and the second end of the secondary side of the second transformer is connected with the fourth input end of the rectification output module;

when the control module controls the first full-bridge module and the second full-bridge module to work simultaneously, the rectification output module outputs high voltage; when the control module controls the first full-bridge module to work and controls the second full-bridge module not to work, the rectification output module outputs low voltage.

2. The LL C resonant circuit of claim 1, wherein the rectified output module comprises a first rectifying unit, a second rectifying unit, a first rectified output terminal and a second rectified output terminal, wherein the voltage difference between the first rectified output terminal and the second rectified output terminal is the output voltage of the rectified output module;

the first input end of the first rectifying unit is connected with the first input end of the rectifying output module, the second input end of the first rectifying unit is connected with the second input end of the rectifying output module, the first output end of the first rectifying unit is connected with the first rectifying output end, and the second output end of the first rectifying unit is connected with the first output end of the second rectifying unit;

and the first input end of the second rectifying unit is connected with the third input end of the rectifying output module, the second input end of the second rectifying unit is connected with the fourth input end of the rectifying output module, and the second output end of the second rectifying unit is connected with the second rectifying output end.

3. The LL C resonant circuit of claim 2, wherein the first rectification unit includes a first diode, a second diode, a third diode, and a fourth diode;

the anode of the first diode is connected with the first input end of the first rectifying unit and the cathode of the second diode respectively, and the cathode of the first diode is connected with the first output end of the first rectifying unit and the cathode of the third diode respectively;

and the anode of the fourth diode is respectively connected with the second output end of the first rectifying unit and the anode of the second diode, and the cathode of the fourth diode is respectively connected with the second input end of the first rectifying unit and the anode of the third diode.

4. The LL C resonant circuit of claim 2, wherein the second rectifying unit includes a fifth diode, a sixth diode, a seventh diode, and an eighth diode;

the anode of the fifth diode is connected with the first input end of the second rectifying unit and the cathode of the sixth diode respectively, and the cathode of the fifth diode is connected with the first output end of the second rectifying unit and the cathode of the seventh diode respectively;

and the anode of the eighth diode is connected with the second output end of the second rectifying unit and the anode of the sixth diode respectively, and the cathode of the eighth diode is connected with the second input end of the second rectifying unit and the anode of the seventh diode respectively.

5. The LL C resonant circuit of claim 1, wherein the first full-bridge module comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;

the grid electrode of the first switch tube, the grid electrode of the second switch tube, the grid electrode of the third switch tube and the grid electrode of the fourth switch tube are all connected with the third input end of the first full-bridge module;

the drain electrode of the first switch tube is respectively connected with the first input end of the first full-bridge module and the drain electrode of the third switch tube, and the source electrode of the first switch tube is respectively connected with the first output end of the first full-bridge module and the drain electrode of the second switch tube;

and the drain electrode of the fourth switch tube is respectively connected with the second output end of the first full-bridge module and the source electrode of the third switch tube, and the source electrode of the fourth switch tube is respectively connected with the second input end of the first full-bridge module and the source electrode of the second switch tube.

6. The LL C resonant circuit according to claim 5, wherein the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are P-channel enhancement type MOSFETs.

7. The LL C resonant circuit of claim 1, wherein the second full-bridge module comprises a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube;

the grid electrode of the fifth switching tube, the grid electrode of the sixth switching tube, the grid electrode of the seventh switching tube and the grid electrode of the eighth switching tube are all connected with the third input end of the second full-bridge module;

a drain electrode of the fifth switching tube is connected with the first input end of the second full-bridge module and a drain electrode of the seventh switching tube respectively, and a source electrode of the fifth switching tube is connected with the first output end of the second full-bridge module and a drain electrode of the sixth switching tube respectively;

and the drain electrode of the eighth switch tube is respectively connected with the second output end of the second full-bridge module and the source electrode of the seventh switch tube, and the source electrode of the eighth switch tube is respectively connected with the second input end of the second full-bridge module and the source electrode of the sixth switch tube.

8. The LL C resonant circuit according to claim 7, wherein the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are P-channel enhancement type MOSFETs.

9. The LL C resonant circuit of any one of claims 1-8, wherein the first resonant module includes a first inductance, a second inductance, and a first capacitance;

a first end of the first inductor is connected with a first input end of the first resonance module, and a second end of the first inductor is connected with a first end of the second inductor and a first output end of the first resonance module respectively;

and a first end of the first capacitor is connected with a second input end of the first resonance module, and a second end of the first capacitor is respectively connected with a second end of the second inductor and a second output end of the first resonance module.

10. The LL C resonant circuit of any one of claims 1-8, wherein the second resonant module includes a third inductance, a fourth inductance, and a second capacitance;

a first end of the third inductor is connected with a first input end of the second resonance module, and a second end of the third inductor is connected with a first end of the fourth inductor and a first output end of the second resonance module respectively;

and a first end of the second capacitor is connected with a second input end of the second resonance module, and a second end of the second capacitor is respectively connected with a second end of the fourth inductor and a second output end of the second resonance module.