17 results about "Voltage source" patented technology

A drive circuit is provided for an OLED pixel display. The drive circuit is adapted for use with a reference voltage source. It includes a first transistor and an OLED. The output circuit of the first transistor is operably connected between the reference voltage source and the OLED. Transmission gate means responsive to a control signal are provided to transmit a data signal to the first transistor. Means are provided for controlling the first transistor in accordance with a time domain modulation signal to provide an average current to the OLED which is a function of the data signal.

An inverter (1) for a grounded direct voltage source, in particular for a photovoltaic generator (2), a battery or a fuel cell, for converting the direct voltage into an alternative voltage with a DC-DC converter (3) and a pulse inverter that is supplied by said DC-DC converter (3), said DC-DC converter (3) being configured to be an oscillating circuit inverter and comprising a series resonant oscillating circuit, said DC-DC converter (3), which is configured to be an oscillating circuit inverter, being configured to be a series-compensated oscillating circuit inverter with a choke (L1) and a series-mounted capacitor array consisting of two or several oscillating circuit capacitors, a rectifier bridge branch including 2 diodes (D3, D4; D5, D6, . . . ), being connected to each of the partial oscillating circuit capacitors, said rectifier bridge branch being connected with its positive or its negative pole to output side intermediate circuit capacitors which are preferably connected in series so that said DC-DC converter (3) delivers at least two bipolar output voltages and is combined with the pulse inverter (4) with a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.

The invention discloses a PWM/PDM double-mode modulation selecting circuit and a double-mode modulation method, which mainly solves the problem that the prior DC/DC converter is not high in average conversion efficiency within a heavy-load range. The whole circuit comprises a bias circuit, a band gap reference voltage source, an error amplifier, an isolation common-source follower, an oscillator, an integrator, a mode judgment comparator, a control comparator, a latch and a driving buffer, wherein the mode judgment comparator and the latch are connected between the output end of the error amplifier and the control end of the oscillator; the magnitude comparison of load current is converted into voltage comparison through the relation of duty cycle and triangular wave; and when the load current is larger, the circuit selects a PWM modulation mode otherwise the circuit selects a PDM modulation mode when the load current is smaller. Under the condition of guaranteeing the performance of the DC/DC converter, the invention improves the average conversion efficiency in a load change interval, and is applicable to the DC/DC switch converter with great load current change, low requirement on circuit volume and high requirement on conversion efficiency.

Measurement circuit components are included in an integrated circuit fabricated on a semiconductor substrate. These measurement circuits are connected to a voltage regulation circuit that provides the integrated circuit voltage source. These measurement circuits provide signals to control the voltage regulation circuit to adjust the voltage output to the integrated circuit based upon a measurement values obtained on the semiconductor device. These measurements include temperature and IR drop at locations on the semiconductor substrate, along with the frequency response of integrated circuit.

The invention concerns a controlling and monitoring device for avoiding damage through overheating in the case of flexible, textile surface heating elements which include at least two opposed contact conductors (3.1, 3.2) made of electrically conducting, non-insulated fibers or wires between which there extends a plurality of heating conductors (8) which are electrically connected to the contact conductors (3.1, 3.2) and to a current-voltage source. At least one additional conductor (1) is guided along at least one contact conductor over the heating conductors (8), wherein the additional conductor (1) is electrically insulated by a covering material and is connected to an electric or electronic evaluation switch (11). The coating material has a softening range which is above the standard heating temperature of the surface heating element, but below the permissible thermal limit temperature of the surrounding materials and of the base material (12), wherein, in the case of overheating, the coating material melts and wherein the heating conductors (8.1, 8.2), together with the additional conductor, form an electrical contact via which, for the purpose of controlling any overheating, an electric current flows to the electric or electronic evaluation unit which is connected to the current-voltage source.

An output circuit sends out, to an input circuit, a control pilot signal generated by a voltage source. A voltage transformer is provided to a control pilot line on the output side of the output circuit, and a communication unit transmits and receives communication signals via the voltage transformer. A voltage transformer is provided to the control pilot line on the input side of the input circuit, and a communication unit transmits and receives the communication signals via the voltage transformer. A low-pass filter is provided to the control pilot line between the input circuit and the voltage transformer.

The invention relates to a three-port DC/DC converter for high-power charging and belongs to the technical field of automobile driving and control. The three-port DC/DC converter solves the problem that a traditional non-isolated buck topology cannot freely and simultaneously realize high-power charging and the control of the free charge-discharge requirements of a battery. An input capacitor is connected in parallel with a voltage source; the positive pole of the voltage source is connected to the drain of a switching transistor Q1; the source of the switching transistor Q1 is connected to the cathode of a diode D1; the anode of the diode D1 is connected to the negative pole of the voltage source; the source of a switching transistor Q2 is connected to the cathode of the diode D1; the drain of the switching transistor Q2 is connected to the cathode of a diode D2; the anode of the diode D2 is connected to the positive pole of a battery; the negative pole of the battery is connected tothe anode of the diode D1; one end of an inductor L1 is connected to the source of the switching transistor Q2; the other end of the inductor L1 is connected to the drain of a switching transistor Q3;the source of the switching transistor Q3 is connected to the anode of a diode D3; the cathode of the diode D3 is connected to the positive pole of the battery; one end of an output capacitor is connected to the drain of the switching transistor Q3; and the other end of the output capacitor is connected to the negative pole of the battery. The three-port DC/DC converter is suitable for automobiledriving and control.

The invention discloses a harmonic power flow calculation method containing a VSC (Voltage Source Converter). Firstly, the fundamental wave power flow is calculated to obtain the fundamental wave voltage of each node, and the modulation ratio of the VSC is obtained; secondly, three pieces of input data, namely, the DC voltage, the modulation ratio and the carrier frequency are substituted into theharmonic model formula of the VSC to obtain the content of each harmonic in the AC side voltage of the VSC, and the VSC is regarded as a harmonic voltage source approximately; and thirdly, in order to realize an interface between a VSC harmonic voltage source model and the harmonic power flow, the VSC and the AC side transformer thereof are equivalent to a harmonic current source with internal impedance based on the Norton's equivalence theorem to form a harmonic admittance matrix, and the harmonic power flow is calculated by harmonic current injection.

The invention relates to a control circuit which serves for security-critical control of a consumer with an inductive load portion, to be connected to a direct voltage source, and a method for failure control. It is in this case assumed that the control circuit has a power driving assembly, a free-wheeling assembly and a reverse-connection protected assembly. In order to increase the probability of failure recognition, this control circuit is extended by a method for failure control. For this purpose the semiconductor switches of the assemblies, each formed by a MOSFET, are individually driven. The different switching statuses are checked by a diagnostic device which processes voltage values to be read out at outputs of the control circuit. In this way failure-free functionality and also possible causes of failure in the control circuit can be diagnosed.

A microelectromechanical system with at least one partly mobile mass element which is suspended from a fixed support by one or more suspension units. Each suspension unit comprises first springs which extend from the fixed support to the partly mobile mass element, and second springs which also extend from the fixed support to the partly mobile mass element. Each second spring is substantially parallel and adjacent to one first spring. The first springs are electrically isolated from the second springs, and the microelectromechanical system comprises a voltage source configured to apply a frequency tuning voltage between the one or more first springs and the one or more second springs.

An electronic load module system for testing voltage sources, such as power supplies, batteries, and fuel cells, is characterized by its ability to combine multiple load modules into a single virtual load for use with a first voltage source while simultaneously allowing other load modules in the same system to independently provide a load to an additional voltage source. The load modules may be combined in various configurations without altering the internal physical structure of the system. The system includes a first load module connected with the terminals of the voltage source and an associated control module connected with the first load module to supply a drive signal to the load module. The load system also includes a second load module. The second load module may be connected with the terminals of the voltage source in parallel with the first load module, or the second load module may be connected with the terminals of a second voltage source. A second control module is connected with the second load module to supply a drive signal to the second load module. The multiple load modules and control modules may be mounted in a single chassis.