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首页> 外文会议>2014 IEEE Fifth International Conference on Communications and Electronics >A zero current detector with low negative inductor current using forced freewheel switch operation in synchronous DC-DC converter
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A zero current detector with low negative inductor current using forced freewheel switch operation in synchronous DC-DC converter

机译：同步DC-DC转换器中使用强制续流开关操作的具有低负电感电流的零电流检测器

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摘要

In DC-DC converter at light load, discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) mode are usually used to improve efficiency instead of using low efficient continuous conduction mode (CCM) in a pulse-width modulation (PWM) control system. For these control modes in light load condition, the zero-current detector (ZCD) to prevent reverse current flowing back to the power source is essential. This paper presents a zero current detection method with enhanced time response of the freewheel switch operation. The proposed ZCD was simulated using a 0.18-µm CMOS process in a test system of PWM voltage mode type-III buck converter, with input voltage of 3.3V. The test system works in CCM at heavy load, PFM at light load, and DCM in a short transient of decision to change from CCM to PFM. The PWM switching frequency is 2MHz, and testing output voltage is 1.8V with load current from 20mA up to 300mA. Under the same test condition, the proposed ZCD shows maximum improvement of 6.9% efficiency in PFM compared to the conventional method, making the overall efficiency greater than 89.7%.
机译：在轻载DC-DC转换器中，通常使用不连续导通模式（DCM）和脉冲频率调制（PFM）模式来提高效率，而不是在脉宽调制（PWM）控制中使用低效率的连续导通模式（CCM）系统。对于轻载条件下的这些控制模式，必须使用零电流检测器（ZCD）来防止反向电流流回电源。本文提出了一种零电流检测方法，该方法可提高续流开关操作的时间响应。拟议的ZCD在PWM电压模式III型降压转换器的测试系统中使用0.18 µm CMOS工艺进行了仿真，输入电压为3.3V。该测试系统可以在CCM重负载，PFM轻负载和DCM瞬变决定从CCM转换为PFM的短时间内工作。 PWM开关频率为2MHz，在20mA至300mA的负载电流下测试输出电压为1.8V。在相同的测试条件下，与传统方法相比，拟议的ZCD在PFM中显示出最大的效率提高6.9％，使整体效率大于89.7％。

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