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.

Constant polarity input device including synchronous bridge rectifier

Abstract: A circuit including bridge rectifier, switches across one or more of the diodes of the bridge rectifier, and a comparator providing control signals to the switch or switches can be constructed to apply a constant polarity voltage to an electrical load, regardless of the polarity of the input power applied to the circuit. The comparator produces a control signal depending upon a comparison of the input power voltages, and the control signal activates one or more of the switches to allow current flow through an appropriate path in the circuit to yield the constant polarity across the electrical load. Thus, the circuit can protect the electrical load from an inappropriately applied voltage by switching the applied voltage's polarity. Because an activated switch can short a diode in the bridge rectifier, power loss associated with current flow through the diode is reduced. Additionally, the circuit can provide constant polarity across the electrical load with either AC or DC input power.

Mains-isolated three=phase asynchronous rotary electrical machine speed monitor e.g. for door - has two=channel processing circuits for delivering bit signals to coupling circuit, which generates output signal when speed is above or below limits, if bit signal changes from rest to active within time window

Abstract: The monitor detects machine speed above or below a given limit value and uses a dual-channel evaluation circuit (11) coupled to the three machine winding phases (5,6,7). Each channel (12,13) of the evaluated circuit has two inputs (15,16;21,22) coupled to two different phases and a single digital output (17,23) providing a binary signal. The two binary signals are combined to provide an output signal which changes from a rest value to an active value when the limit value is exceeded. Pref. each channel of the evaluation circuit contains a voltage amplifier with a variable amplification and a precision rectifier. USE/ADVANTAGE - For asynchronous motor drive indicating abnormal speed to prevent overloading, without noise problems and without structural interference in or at machine.

Apparatus for multi-level switched-capacitor rectification and DC-DC conversion

Abstract: A voltage-step down rectifier topology suitable for integration on a die of an integrated circuit is described. In one embodiment, a switched capacitor rectifier is provided having an architecture such that an input voltage swing of the switched-capacitor rectifier is a factor N times an output voltage where N depends upon the number of stages such that the switched-capacitor rectifier can provide a π/(2N) step-down voltage conversion ratio between an input fundamental ac peak voltage to the output dc voltage. In one embodiment, the rectifier is used in dc-dc conversion. In one embodiment, the rectifier is used in ac power delivery to low-voltage electronics.

Power converter having synchronous rectifier and control method of synchronous rectifier

Abstract: Disclosed is a power converter including a switching circuit; a transformer having a primary winding connected to the switching circuit and a secondary winding; a main control circuit connected to the switching circuit for outputting a main control signal to manipulate the switching circuit; at least one synchronous rectifier connected to the secondary winding; at least one current transformer connected to the synchronous rectifier for outputting a detecting signal according to a current flowing through the synchronous rectifier; and at least one synchronous rectification control circuit connected to a control terminal of the synchronous rectifier, the current transformer, and a control terminal of the switching circuit for receiving the detecting signal and the main control signal for manipulating the synchronous rectifier. In case that the main control circuit manipulates the switching circuit to turn on, the synchronous rectification control circuit manipulates the synchronous rectifier to turn on, and thereby allowing the synchronous rectification control circuit to manipulate the synchronous rectifier to turn off according to the detecting signal.

A new mixed mode full-wave rectifier realization with current differencing transconductance amplifier

Abstract: In this paper, a new mixed mode full-wave rectifier which consists of a current differencing transconductance amplifier (CDTA), resistor and two complementary MOS transistor is presented. The proposed circuit is called as mixed mode because it can be used as current-, voltage-, transimpedance- and transconductance-mode rectifier depending on how the resistor is connected to the input or output of the circuit. The presented circuit has an appropriate zero crossing performance, linearity, low component count, and can be adapted to modern IC technologies. It is also suitable for monolithic integrated implementation. LTSPICE simulations with 0.18 μm CMOS model obtained through TMSC are included to verify the workability of the proposed circuit. We also performed noise and Monte Carlo analyses. Various simulation results are presented to show the effectiveness of the proposed circuit.