Diode-transistor bridge

FIELD: electrical engineering.

SUBSTANCE: proposed diode-transistor bridge relates to electrical engineering, particularly to electrical machines and can be used in structural couplings with magnetic bearings. Diode-transistor bridge comprises supply diagonal and load diagonal incorporating at least one inductor coil (8). Note that throttle (7) is additionally included in load diagonal, RC-circuit (9) being connected in parallel to said throttle. Capacitor (12) and power source are connected in said supply diagonal, the latter being connected via separating diode (13). Transistors (5,6) connected into bridge arms have no common connection point. Storage capacitor (12), throttle (7) with RC-circuit (9) and separating diode (13) connected in the diode-transistor bridge in proposed manner, allows a notable reduction in consumed power of the bridge, diametre of conductors connected to power supply and its overall dimensions.

EFFECT: higher reliability, reduced dependence of source weight-and-size upon consumed power.

1 dwg

 

The invention relates to electrical engineering, in particular to electrical machines and can be used in a constructive mates with magnetic bearings.

Known diode-transistor bridge containing the high power and high load (patent RU 2215357, NC 7/09). Thus each diode connected transistor collector to the cathode of the diode, and the emitter to the anode of the diode.

The disadvantage of diode-transistor bridge is the dependence of the mass-volume characteristics of the power supply from its power.

The technical result is to increase the reliability of the power Converter and reducing the dependence of mass-volume characteristics on the power consumption.

The technical result is achieved by diode-transistor bridge containing the high power and high load, which includes at least one inductor. In addition, in the high load is additionally connected to the inductor in parallel, which included RC - chain. In the high power switched capacitor, a diode, a power source. The transistors included in the shoulders of the bridge, do not have a common point of connection.

The drawing shows an electric diagram of the diode-transistor bridge.

Diode-transistor bridge comprises four diodes 1, 2, 3, 4, and two transistors 5, 6. In the diagonal loading the CI series-connected choke 7, the coil 8 of the electromagnet. In parallel to the inductor 7 is enabled RC-chain 9 of the resistor 10 and capacitor And. In the high power switched capacitor 12 and, via an isolating diode 13, a power source (not shown). When this cathode barrier diode 13 is connected to the cathodes of the diodes 1 and 3. The anode separator diode 13 is connected to the positive terminal of the power source.

Diode-transistor bridge operates as follows.

The control pulses from the pulse-width modulator (hereinafter PWM, not shown) are fed to the gates of transistors 5 and 6. When turning on the power source and the absence of control pulses is the charge of the capacitor 12 through the isolation diode 13 to the voltage of the power source. Upon receipt of a positive pulse with a predetermined duration by the transistors 5 and 6 are opened simultaneously and the high load of the bridge is connected to the capacitor 12. The capacitor 12 is discharged through the transistor 5, the inductor 7, the coil of an electromagnet 8, and the transistor 6. In the initial moment of time in the inductor 7 and the coil of the electromagnet 8 occurs self-induced EMF that opposes the increase in current in the coil of the electromagnet 8. The corresponding current inductance flows through the circuit: inductor 7, the diode 1, capacitor 12, diode 4, the coil of the electromagnet 8, which supports the voltage on the capacitor is 12. Under steady state current self-induced EMF is missing. At the end of the control pulses from the PWM transistors 5 6 closed. If this happens reduce the current flowing through the inductor 7 and the coil of an electromagnet 8. This causes a self-induced EMF in the inductor 7 and the coil of the electromagnet 8, striving to maintain a decreasing current. Current inductance flows through the circuit: inductor 7, the coil of the electromagnet 8, the diode 3, the capacitor 12, diode 2. The current self-induced EMF is also seeking to recover the voltage on the capacitor 12 is decreased when applying control pulses. Subsequent appearance of a positive pulse with PWM reopened the transistors 5 and 6 and the process repeats. If during operation the voltage on the capacitor decreases to a value below the voltage of the power source, open the separating diode 13 and capacitor 12 is additionally charged from the power source. Dividing the diode 13 prevents the flow of current self-induced EMF across the power source. RC circuit 9 limits the emission voltage on the inductor 7. The inductor 7 and the capacitance value of the capacitor 12 is selected as the inductance of the coil of the electromagnet 8 (load) to provide resonance at the frequency of the PWM when their parallel operation. Thus, in the process, the reactor 7, the coil is of electromagnet 8 and the capacitor 12 form a resonant circuit, in which the accumulated energy of the electric field of the capacitor 12 is converted into the energy of the magnetic field of the inductor 7 and the coil of the electromagnet 8 and Vice versa. When the direction of current in the load is not changed, and the presence of the diode 13 provides minimal direction of energy from the power source. In addition, the separator diode 13 prevents the failure of the transistors 5 and 6 accidental change of polarity of the power source.

Introduction to diode-transistor bridge storage capacitor 12, the throttle 7 with RC-circuit 9, the separator diode 13 on the proposed scheme can significantly reduce power consumption diode-transistor bridge, to reduce the diameter of the conductors connected to the power source, and also the weight and dimensions of the power source.

Testing of the turbine-generator power 8mvt magnetic suspension of the rotor, containing eight coils of the electromagnets at an average current of 18A each (total 144A) showed that the current consumed from the power source is not exceeded 7A at a constant voltage.

Diode-transistor bridge, in the high load that includes at least one inductor, characterized in that the diagonal loading is additionally connected to the inductor in parallel, which included RC-chain, and in the diagonal feed the switched capacitor through the diode - the power source, and the transistors in the arms of the bridge does not have a common point of connection.



 

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The invention relates to the field of electrical engineering and can be used in power supplies

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FIELD: electrical engineering.

SUBSTANCE: proposed diode-transistor bridge relates to electrical engineering, particularly to electrical machines and can be used in structural couplings with magnetic bearings. Diode-transistor bridge comprises supply diagonal and load diagonal incorporating at least one inductor coil (8). Note that throttle (7) is additionally included in load diagonal, RC-circuit (9) being connected in parallel to said throttle. Capacitor (12) and power source are connected in said supply diagonal, the latter being connected via separating diode (13). Transistors (5,6) connected into bridge arms have no common connection point. Storage capacitor (12), throttle (7) with RC-circuit (9) and separating diode (13) connected in the diode-transistor bridge in proposed manner, allows a notable reduction in consumed power of the bridge, diametre of conductors connected to power supply and its overall dimensions.

EFFECT: higher reliability, reduced dependence of source weight-and-size upon consumed power.

1 dwg

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