A family of integrated filter forward converters includes a filter inductor is magnetically included in the transformer assembly. A basic circuit includes a DC voltage source, two cross-coupled capacitors, a clamp diode, a power switch, two identical transformers (or equivalent to a transformer and a filter inductor), two rectifying diodes, a filter capacitor and a load resistor. Several useful versions can be obtained by modifying the basic circuit for different applications. Both the input and...

Testing of digital-to-analog converters is accelerated by applying one or more different approaches. One approach relies on a switched capacitor, which lowers the overall capacitance of the converter during testing, thereby reducing the settling time for each code value. Another approach makes the duration of each testing step a function of the particular code value, rather than using the worst-case settling time for each testing step. Yet another approach uses a sequence of non-consecutive code...

Liquid impinges on two sides (15, 17) of a plate (11) of piezoelectric material, for the liquid to be exposed to ultrasonic waves by the plate (11) oscillating at ultrasonic frequency. An electric voltage is uniformly applied to the two sides (15, 17) of the plate (11) at its peripheral edge via annular contact plates (27). The contact plates (27) have resilient fingers (31) bent towards the plate (11) for transferring the voltage on the one hand and for uniformly clamping the plate (11) on the ...

An analog signal is converted to a digital signal by two analog-to-digital converters. The first converter digitizes the analog signal to produce a first series of samples of the signal. The second converter digitizes the analog signal after it has been shifted in phase by 180 degrees to produce a second series of samples. A digital adder then subtracts the second series of samples from the first series to produce the digital signal.

A modulator for resonant DC link and other power converters is provided having superior performance and general applicability to multi-phase converters. The modulator includes three major components: (1) a multi-input, multi-output linear system, (2) a quantizer, and (3) a latch. The linear system receives multiple reference signal waveforms and multiple feedback signal waveforms representative of the modulator output as input signals and produces multiple linear output signals derived from the ...

A circuit provides a reset and start pulse synchronized with a clock pulse for accurate starting and timing of the integrating process in a conventional dual-slope converter. A cycle flip-flop is randomly set to a logical one state to enable a gate to pass the next inverted pulse from a clock. Further pulses are inhibited from passing through the gate by an inhibit signal generated by a toggling flip-flop responsively to the trailing edge of the gate output pulse. The leading edge of the gate ou...

An analog-to-digital converter of the dual slope integrating type operates without counter reset or input gating circuitry to provide successive, accurate digital readouts representing the average magnitude of corresponding analog input signals. Provision is made to nullify a predetermined number of transient waveforms which may be produced as an undesired by-product of dispensing with such circuitry. The converter employs a buffer storage register to receive and store the digital contents of a ...

A static converter composed of a converter-transformer and a rectifier bridge connected thereto has a bypass member connected in parallel with the bridge. Two series-connected rectifiers in one phase of the bridge constitute a bypass path. A direct voltage source can be connected with said two bypass rectifiers, the source having such a polarity as to furnish a current in the conducting direction of the two rectifiers.

In an integrating analogue-to-digital converter, particularly a digital voltmeter, the input voltage is applied to an integrator for a sampling period equal to one period of the local line frequency (e.g., 50 Hz or 60 Hz). The integrator has a transfer function of the form 1/pT for a fixed period S just less than the minimum possible duration of the sampling period, and of the form 1/(1+pT) for the remainder dS of the sampling period. Thus D.C. voltages are integrated for a known fixed period, w...

A hydrodymanic torque converter comprising a toroidal working chamber having a fluid outflow region, a fluid inflow region, and inner and outer transition regions. A ring of pump blades are located essentially in the outflow region, and a ring of guide blades and rings of turbine blades are located generally in the inflow region. At least a portion of one of the blade rings is positioned in one of the transition regions and includes blades which are twisted three-dimensionally by differing amoun...