RussianPatents.com

Semi-bridge thyristor inverter. RU patent 2321942.

FIELD: electric engineering.

SUBSTANCE: in accordance to the invention, a transformer is coupled into alternating current diagonal of semi-bridge thyristor inverter. Secondary winding of transformer through diode bridge is connected to constant current load. In parallel to main semi-bridge thyristor inverter, an additional semi-bridge thyristor inverter is included into constant current diagonal which has capacitors with approximately ten times less capacity compared to the main one. An additional transformer winding is incorporated into alternating current diagonal of additional inverter with number of coils less than that of its primary winding. The inverter is controlled from typical pulse-width regulation circuit in broad range of loads.

EFFECT: prevention of additional power losses in commutation block, ensured constancy of power amplitude on load during regulation and simplification.

3 dwg

IPC classes for russian patent Semi-bridge thyristor inverter. RU patent 2321942. (RU 2321942):

H02M7/53846 - Conversion of ac power input into dc power output; Conversion of dc power input into ac power output

Another patents in same IPC classes:

Device for adjusting output current of impulse stabilizing transformer / 2321148
The device contains two-cycle impulse transformer with two high frequency controllable switches (1,2), an input LC-filter (3) and output transformer (9), connected to secondary winding (8) of which are: rectifier (7); network rectifier (10), connected through switch (11) to input of LC-filter (3); output LC-filter (4), is connected by input to output of rectifier (7) and by output to load circuit (5); control unit (15) is connected by output to contacts of primary windings of dividing transformers (17,18), contacts of secondary windings of which are connected to control circuits of switch (1,2); adding amplifier (16) is connected by first input through current sensor (6) to output of LC-filter (4) and by output to input of control unit (15); pulse-width modulation comparator (12) is connected by output to control input of switch (11) and by first input through generator of linearly changing voltage (13) is connected to output of clock impulse generator (14); integration adder (21) is connected by first input to current setting supporting voltage supply (19), by second input to output of current sensor (6) and by output to second input of adding amplifier (16); and amplifier with piecewise-linear transfer characteristic (20) is connected by input to output of adding amplifier (16) and by output to second input of the pulse width modulation comparator.

Phase-shifting device / 2320071
Device contains control signal source (input of phase-shifting device), adder, amplitude modulator, integrator, 2 relay elements, logical element "XOR", three logical elements "2AND", subtracting "n"-bit binary counter, input for connecting a supply of supporting voltage, generator of stable frequency impulses, adding "n"-bit binary counter, digital comparator, logical element "kAND", where n>k, mono-stable multi-vibrator, logical element "2OR", input for connecting the source of control impulses for power thyristors. Device belongs to the class of integrating systems with two digital scanning functions. One scan is independent and is generated due to generator of stable frequency impulses. The second scan is dependent, which is generated from control signal, and transformed due to impulse signal from output of voltage transformer to impulse frequency. Command for managing power thyristors is generated at the time moments when numeric values of independent and dependent scanning functions are equal or exceeded.

Device for measuring three-phased voltage / 2314630
Device contains three-phased bridge rectifier, made on diodes (1-6). Output contacts of rectifier, being output contacts of indicator, are meant for connecting load circuit (7). Resistors (8-10) are introduced into input circuits of alternating current, connected to corresponding phases of voltage supply being measured. Resistance value of each resistor (8-10) equals to (0,5÷0,7) of value of active resistance of constant current load chain (7).

Mode(variants) and an arrangement(variants) of electric supply of predominantly portable electron aids / 2269862
The aids include at least one active element with three or more electrodes particularly a transistor and using this active element(elements) carry out amplification, conversion or generation (formation) of working electric signals of alternating or direct voltage including broadband signals. The mode and the arrangement for electric supply of predominantly portable electron aids is carried out by way of using at least one a three-electrode active element, amplification, conversion or generation of an electric signal of alternating or direct voltage based on supplying voltage on the clamps of the electron aid, impulse voltage whose on-off time ratio is within the limits of 1,1-20,0 is used as supply voltage. In the second variant of the mode and of the arrangement the impulse voltage has the following parameters: the frequency of impulses is at least one level higher than the maximum frequency of the spectrum of the electric signal of alternating voltage or at least one level less than the minimal frequency of the spectrum of this electric signal, and the duration of the impulse fronts is at least one level less than the magnitude inverse to the maximum frequency of the spectrum of the electric signal of alternative voltage.

Semi-bridge thyristor inverter / 2321942
In accordance to the invention, a transformer is coupled into alternating current diagonal of semi-bridge thyristor inverter. Secondary winding of transformer through diode bridge is connected to constant current load. In parallel to main semi-bridge thyristor inverter, an additional semi-bridge thyristor inverter is included into constant current diagonal which has capacitors with approximately ten times less capacity compared to the main one. An additional transformer winding is incorporated into alternating current diagonal of additional inverter with number of coils less than that of its primary winding. The inverter is controlled from typical pulse-width regulation circuit in broad range of loads.

Method of control of tetrasquare converter with computation of switching phases and microprocessor device to implement method / 2327276
Invention relates to electrical engineering and may be used to control the electric train AC. The invention increases the accuracy in control of the converter and eliminates alarm operating conditions. The method of control of tetrasquare converter with computation of switching phases includes generating the data on the dependency of the gate switching intervals on the depth of modulation and inputting this data into the memory of the converter control system for the range of tolerable operating frequencies in compliance with the number of the PWM-intervals. The control system is used to preset the current voltage value at the converter output, the current circuit value and the value of phase difference between the circuit voltage and current. The circuit current value id regulated by varying the voltage modulation at the converter input. The intervals of the controlled gates switching are calculated and the voltage modulation value is varied by setting the control signal for cutting in- cutting off the gates. The method features the correction of the gates cutting in interval values allowing for certified data on controlled gates, operating conditions and the converter load nature. Here, in every half-cycle of the supply voltage, the maximum modulation frequency is limited by the gate switching duration. The microprocessor device to control the said converter incorporates a timer, a processor, an operating memory, a permanent memory, ANC, drivers' unit, current sender, synchroniser and the input current amplitude generator, timer inputs-outputs, those of the processor, permanent memory, operating memory. The drivers' unit inputs are coupled by the data-address bus. It also includes the converter operation parameters generator, voltage sender, gate switching phase computation unit, the unit of limiting switching intervals, the time interval I/O unit, the unit of communication with the converter load.

Method of output voltage control in multi-cell frequency converter / 2331151
Invention refers to electric engineering and may be used in inductive heating systems with semi-conducting frequency converters when control system are designed. Method is intended for controlling output voltage of converter containing several inverters and multi-elements matching transformer with primary windings being connected to proper inverters and secondary windings being connected serially forming voltage summation circuit. Output voltage of one inverter is controlled by means of DC voltage converter connected to inverter input within the range defined by low and high thresholds. Other non-controlled inverters connected in parallel or fed from rectifiers are actuated into one of two states: "boosting voltage" or "short circuit". Output voltages of non-controlled inverters are set to be proportional to weight coefficient of bit pattern (1, 2, 4, 8, 16, ...). Different combinations of non-controlled inverters states form several levels of output voltage further creating several sub-ranges (zones) of output voltage controlling. Control is conducted by controlled inverter within those sub-ranges. Therefore, if output voltage of controlled inverter achieves proper range of controlling, states of non-controlled inverters are changed so that sum of non-controlled inverters weight coefficients being in "voltage boosting" mode could change by one. It results in control range shifting in controlled inverter by the voltage value assigned for lowest weight coefficient.

Direct current to alternating current converter / 2333591
Invention pertains to electrical engineering, and specifically to invertors for autonomous electrical power supply for different electrical equipment, requiring use of sinusoidal alternating current. The direct current converter has a generator of sinusoidal voltage, a driver-amplifier and a power electronic converter. The sinusoidal voltage generator with frequency f is in the form of a miniature motor-generator, the electric motor of which rotates with a stable velocity proportional to frequency f and the motor-generator controls the electronic breaker-splitter. The electric motor of the motor-generator works on direct or alternating current and can smoothly change speed of rotation.

High voltage electric drive of alternating current (versions) / 2334349
Composition of the electric drive of an alternating current includes the frequency converter, the invention can be used for the launching and control of the work of asynchronous or synchronous electric drives with the working voltage 6...10 kV and power of up to tens of mW. The high-voltage electric drive of the alternating current with the three-phase electric motor contains a source of an adjustable direct current, three-phase bridge thyristor chopper, switching devices connected to the outputs of alternating current of the inverter consistently with the phases of the three-phase winding of the electric motor, sensors of current and voltage and the control devices of the inverter and switching devices. Each switching device contains a capacitor with two outputs and the bidirectional symmetric operated semi-conductor key connected in parallel to it completely. Starting of the switching device in the electric drive is carried out in the manner as it specified in the materials of application for each of the three variants. In the electric drive for each of the variants protection of semi-conductor keys is provided at extraordinary and emergency situations.

Method of providing power supply of electrodynamic flying vehicles / 2335060
Invention relates to remote transfer and conversion of super-high-frequency energy into DC electrical power. The proposed method consists in fitting an aluminium foil enclosure on over the entire surface of the vehicle airframe skin. The super-high-frequency converter is made in a material representing a mix of two chemical solid-state components with grain size not over 30 to 50 microns, taken in equal proportion but different atomic numbers, and forming, when combined, a dipole solid-state matrix. Note that the said bi-component mix is applied uniformly onto the said skin enclosure, the like poles of the dipole matrix being combined and connected to appropriate terminals of the vehicle flight control components.