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CMOS rectification circuit with synchronous rectification function, circuit compensation method and rectifier

A technology of rectification circuit and compensation method, which is applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., and can solve the problems of large volume and inconvenient integration

Pending Publication Date: 2020-10-02
浙江金洲电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The shortcomings of diode rectification are obvious, the volume is too large, it is not easy to integrate, and the voltage drop of each diode is 0.7V, the voltage loss applied to the circuit is immeasurable
Second, the reverse leakage introduced during the charge transfer state (ON-OFF) of the diode-connected transistor

Method used

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  • CMOS rectification circuit with synchronous rectification function, circuit compensation method and rectifier
  • CMOS rectification circuit with synchronous rectification function, circuit compensation method and rectifier
  • CMOS rectification circuit with synchronous rectification function, circuit compensation method and rectifier

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Embodiment 1

[0031] Aiming at the problem of high threshold voltage of diode-connected MOS transistors and high power consumption, the design is as follows: figure 2 The unit structure shown is a CMOS rectification circuit with synchronous rectification function.

[0032] The essence of the external threshold voltage compensation technology of the rectifier circuit is to introduce a compensation voltage V between the gate and drain of the transistor C . Take NMOS as an example to illustrate its principle: the gate-source voltage V of NMOS gs Since V cn The presence of the NMOS becomes more correct, and the forward conduction current of the NMOS is larger.

Embodiment 2

[0034] The external threshold compensation structure voltage provides precision, but the external input voltage makes the circuit structure cumbersome, and the external input voltage leads to greater power consumption. The traditional self-threshold cancellation rectifier intercepts the voltage inside the structure, and applies a constant voltage to the gates of the two active transistors to achieve the purpose of threshold compensation. This method will cause inevitable reverse leakage current. The bridge rectifier provides a compensation voltage for the MOS tube through dynamic bias, which successfully solves the problem of reverse leakage current, but the dynamic compensation voltage is not accurate enough to compensate well.

[0035] In this embodiment, a switch-controlled threshold compensation rectifier is proposed in combination with a dynamic threshold control and a self-threshold cancellation circuit. Considering that no external voltage is required, the polarity of ...

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Abstract

The invention discloses a novel radio frequency-to-direct current (RF-DC) rectifying circuit, and provides a switch control type threshold compensation rectification circuit structure. According to the invention, threshold compensation is carried out by adopting a fixed voltage of an internal node of a rectifying circuit while a concept of synchronous rectification is adopted, and the on-off stateis controlled by using an input sine voltage, so that a switching speed is ensured, and a power supply conversion efficiency is improved; and after an SMIC 0.18 [mu]m standard CMOS technology is adopted for design, the results show that under the conditions of an HF frequency band (13.56 MHz) and an input voltage of 1V, the output voltage of the rectifying circuit can reach 1.47 V, and under thecondition of a load of 80 K[omega], the conversion efficiency of the rectification circuit reaches 55%.

Description

technical field [0001] The invention relates to a CMOS rectification circuit with a synchronous rectification function, which belongs to the field of semiconductor devices. Background technique [0002] RF-DC conversion refers to the use of wireless radio frequency signals in space to collect energy from radio frequency signals and convert them into DC power to supply power for the self-system of low-power microelectronic communication equipment. [0003] Regardless of the mechanism of RF energy conduction and the final application, the RF power output when the energy converter conducts the energy of the RF circuit should be a transmission form of AC RF current or AC RF voltage. Since the AC radio frequency energy cannot be used directly, in order to provide a directly usable RF DC power supply for all electronic radio frequency circuit equipment, it is necessary to use an RF-DC rectifier, such as figure 1 shown. [0004] An induction coil or antenna captures the RF signal...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/08
CPCH02M1/08H02M7/217
Inventor 姜岩峰李岚钰沈小虎焦彦平
Owner 浙江金洲电子科技有限公司