SU1552309A2 - Push-pull transistor inverter - Google Patents

Abstract

The invention relates to electrical engineering, in particular to converter equipment, and can be used in the design of secondary power sources. The purpose of the invention is to increase reliability and efficiency by eliminating transformer saturation. The device contains an inverter 1, a transformer 2, made on a core of a material with a non-rectangular hysteresis loop, a full current sensor 3, an integrator 4, a relay element 5 with a hysteresis characteristic, an asymmetrical multivibrator 6, contact groups 7, 8, and a delay element 11. Introduction of an element the delay 11 provides the switching delay of the contact group 7, 8 with respect to the instant of operation of the relay element 5 with the hysteresis characteristic. During the delay time, the next inverter switching occurs, and the operating point of the transformer core moves in the direction opposite to the saturation direction. 1 il.

Description

The invention relates to the field of electrical engineering, in particular to converter equipment, can be used in the design of secondary power sources and is an improvement of the device according to the main author, No. 1422327,

The purpose of the invention is to increase reliability and efficiency by eliminating the power of transformer sys.

The drawing shows a functional diagram of a push-pull transistor inverter.

The device contains an inverter 1c with two control inputs, a transformer 2 with primary and secondary windings, made on a core of a material with a non-rectangular hysteresis loop, a full-current sensor 3, an integrator 4, a relay element 5 with a hysteresis characteristic, an asymmetrical multivibrator 6, two the outputs of which are connected through contact groups 7 and 8 with two control inputs 9 and 10 of inverter 1, and contact groups 7 and 8 are connected to the relay element 5 through the delay element 11 Sensor 3 of full current is connected to p The first element 5 of the multivibrator 6 is connected to the first control input 9 of the inverter 1 via the disconnecting contact of the contact group 7 and the second control input 10 of the inverter 1 through the closing contact of the contact group 8, and the second output of the multivibrator 6 is connected to the second input 10 of the inverter 1 through the opening contact of the contact group 8 and the first input 9 of the inverter 1 through the closing contact of the contact group 7. The integrator 4 is designed to perform the operation of extracting the fixed signal component ala coming from sensor 3 full current „

The inverter works as follows,

When the supply voltage is applied to the inverter 1 and the asymmetrical multivibrator 6, the DC voltage is converted into AC voltage pulses, In the core J

transformer 2 under the influence of the asymmetrical nature of the operation of the multivibrator 6, the induction with the frequency of the latter varies in time,

5 0 5 about 5 about 5

P

five

a symmetric quotient of the hysteresis loop, gradually moving along the magnetization curve to one side,

At the same time, as the inverter operates, the signal from the output of the integrator 4 increases, reaching the voltage level of the relay element 5. Let this happen at the moment when the first input 9 of the inverter 1 ends with a control pulse of longer duration coming from the first output of the asymmetric multivibrator 6 “However, due to the presence of a delay element 11, switching of inputs 9 and 10 of the inverter 1 does not occur and the control pulse of shorter duration arrives from the second output of the asymmetrical multivibrator 6 during the delay, pass through the break contact of the contact group 8 to the second input 10 of the inverter 1, thereby moving the working point of the transformer core along the magnetization loop in the direction opposite to the saturation direction. After the delay time has elapsed, the inputs 9 and / 10 of the inverter 1 are switched. The inverter continues to operate with a gradual movement of the transformer induction point through private asymmetric hysteresis loops, while the voltage at the output of the integrator 4 reaches the release voltage of the relay element 5 "

The processes in the inverter when releasing a relay element are similar to those indicated above.

Claims (1)

The proposed device is characterized by higher reliability and efficiency as compared to the known one, in which a transient inverter transient transformer saturates the transient inverter in the event that two control pulses are fed to one of its inputs when the relay 5 is switched. Push-pull transistor inverter auth. St. 1422327, characterized in that, in order to increase reliability and efficiency by eliminating transformer saturation, a lag element was inserted between a relay element having a hysteresis characteristic and two contact groups.