Precision rectifier

About: Precision rectifier is a research topic. Over the lifetime, 4952 publications have been published within this topic receiving 63668 citations. The topic is also known as: super diode.

Peak to peak signal detector for audio system

Abstract: A peak to peak detector circuit for use in an audio system comprises a first amplifier having an input terminal for receiving an L+R AC audio signal and an output terminal which is serially coupled to a resistor in series with a capacitor for generating a variable dc voltage having a time vs. amplitude relationship corresponding to the input L+R AC audio signal. A clamping diode having a cathode electrode coupled to a reference potential and having an anode electrode coupled to the capacitor operates to limit negative amplitude excursions associated with the variable dc voltage to a predetermined minimal value. A rectifying diode having a cathode electrode coupled to the anode electrode of the clamping diode, and an anode electrode coupled to a second capacitor to charge the second capacitor responsive to the amplitude of said variable dc voltage operates to produce a dc output signal proportional to the peak amplitude of said L+R audio signal.

Fully-digitalized implementation of PFC rectifier in CCM without ADC

Abstract: As generally acknowledged, the main drawback of a fully-digitalized power-factor-correction (PFC) rectifier is that too many analog-to-digital converters (ADCs) are used, and hence the corresponding cost is high. Hence, in this paper, the information on the required signal is obtained via two paired sawtoothed waves compared with the sensed signal, without any ADC used. For the PFC rectifier operating in the continuous conduction mode (CCM), two proposed formulas used to figure out the average inductor current, together with the strategy for changing sampling points, are applied to accurately sampling the average inductor current of the PFC rectifier. At the same time, based on the slope value of the inductor current obtained from the first average current calculation formula, another formula used to calculate the input voltage is derived so as to obtain the input voltage information used to feed the partial feedforward controller. As for the sinusoidal current command, it is generated by a sinusoid table along with a zero crossing detector. On the other hand, the information on the output voltage is obtained by one approximate formula. Therefore, there is no ADC required to realize full digital control of the PFC rectifier operating in CCM. Furthermore, the feasibility and effectiveness of the proposed sampling topology are verified by experimental results.

A 66-dB Linear Dynamic Range, 100-dB· $\Omega$ Transimpedance Gain TIA With High-Speed PDSH for LiDAR

Abstract: A wide dynamic range (DR) receiver for the linear pulsed light detection and ranging (LiDAR) is presented, including a high linear DR transimpedance amplifier (TIA) with digital codes to vary its gain and a high-speed peak detector sample and hold (PDSH) circuit to capture the peak value of echo pulses. In order to extend the linear DR without reducing the bandwidth, a source follower is introduced to turn the common-gate amplifier into a large swing current mirror amplifier, leading to stable and low input impedance and three programmable transimpedance gain modes. For improving the precision of the PDSH circuit, a variable current source is utilized to replace the rectifying current mirror to alleviate the overshoot and pedestal voltage error. Implemented in 0.18- $\mu \text{m}$ standard CMOS technology, the proposed TIA achieves a high linear DR of 66 dB with a wide bandwidth of 110 MHz, and the highest gain reaches 100 dB· $\Omega $ . The error of PDSH circuit is less than 0.4% for 70-ns peaking width pulses with amplitude from 100 mV to 1.1 V. The receiver chip consumes 21 mW with a single 3.3-V supply, where the TIA and PDSH consume 8 and 13 mW, respectively.

Single-phase power factor correction circuit with three-level boost converter

Abstract: A control scheme for the single-phase three-level rectifier with high power factor and low total harmonic distortion of the line current is proposed. A hysteresis current comparator is used to control the line current following the line current command. The advantages of the proposed control scheme for a three-level rectifier are (1) low blocking voltage of each power device; (2) low harmonic content; and (3) high power factor. The control scheme is based on the region detector of the rectified line voltage, capacitor compensator and hysteresis current comparator. Experimental results from a laboratory prototype show that the proposed scheme gives good steady-state performance of the three-level rectifier which coincides with the theoretical results.

Constant-voltage power supply

Abstract: In a power supply circuit useful for a horizontal deflection circuit in a television receiver, there is provided a voltage-controlled semiconductor element, for example, such as silicon controlled rectifier, in order to stabilize effectively the output power voltage. The silicon controlled rectifier is switched between its OFF and ON states in response to two kinds of pulses: flyback pulses occurring within the television receiver and newly produced control pulses having relative phases with respect to the phase of the flyback pulses which relative phases differ depending upon variations in the input power voltage. Current flow through the silicon controlled rectifier charges a capacitor connected thereto which in turn provides the stabilized output voltage to the horizontal deflection circuit.