SU935920A2 - Stabilizer - Google Patents

Description

I

The invention relates to electrical engineering, to secondary power sources and can be used to stabilize the current.

But the main author. St. No. 798766 is known for a current regulator, a content adjustable inverter connected to the load via an output transformer, a rectifier and an output current sensor connected to the control of the Inverter's input through an auxiliary rectifier, a reference unit and a feedback circuit, and the output transformer is made in the form of two separate cores covered by the secondary winding, one of which contains the primary winding and the other has a winding connected to the input of the auxiliary rectifier, and sequentially from the primary A transformer capacitor tl is introduced by the winding of the transformer.

The disadvantages of the known current stabilizer are that

The frequency of the series oscillating circuit formed by the capacitor capacitance and the inductance of the primary winding of the inverter's output transformer does not remain constant under the influence of temperature, vibration, etc., which leads to a violation of the parametric current stabilization condition.

The purpose of the invention is to improve the reliability of the current stabilizer by stabilizing the frequency of the series oscillatory circuit formed by the capacitor capacitance and the inductance of the primary winding of the output transformer of the inverter ..

The goal is achieved by the fact that in the current stabilizer a non-magnetic strip is inserted into the core of the inverter output transformer on which the primary winding is located.

The drawing shows the current stabilizer circuit. 393 The current stabilizer consists of a voltage regulator 1, an output transformer 2 of the inverter, a comparison circuit and feedback 3, a rectifier of the output voltage 4 of the inverter., A feedback voltage rectifier 5 and a capacitor 6 connected in series with the output transformer inverter. The magnetic core of the output transformer is divided into two cores. The primary winding 8 is wound on the core 7, and the winding 10 of the current sensor is wound on the core 9, after which these cores with the OS51 windings are combined, and they have a secondary winding 11 loaded on the load resistance 12. Moreover, the core on which is wound on the primary winding, is made with a non-magnetic gasket 13. The winding 10 of the current sensor is loaded on the rectifier of the circuit breaker, tandem connection 5. The comparison and feedback circuit 3 performs the comparison of the feedback voltage with any reference voltage, and adjustment of the pulse duty cycle PTOP. The load current of 12 W is proportional to the current E / 2. secondary winding 11. This current creates a magnetic flux F in core 9. If cores 7 and 9 are designed so that they work on a linear part of the magnetization curve, then this flux F is proportional to current 3. 3 therefore EMF E winding 10 is proportional to current 2 Thus, the constant voltage V is proportional to the load current O 2. The voltage 1 through the comparison and feedback circuit 3 controls the duty cycle of the inverter pulses so that the current 3 in the load 12 remains constant. In addition, in this scheme, parametric stabilization of the load current is also realized, which is achieved by introducing into the circuit a capacitor 6, which, with the primary winding 8 of the output transformer 2, has a serial oscillating circuit. When the resonant frequency of this circuit coincides with the pulse frequency of the inverter, the current in the load 12 does not depend on its resistance. inductance of the primary winding 8 of the output transformer 2 located on the core 7 with a non-magnetic gasket 13 is defined by the expression: where L is the inductance of the primary rev / hank, LI is the magnetic permeability of the vacuum J / is the relative magnetic permeability of the core 7 as a body; S is the core section area, W is the number of winding turns 85 1crr — the average magnetic field line length of the core 7. As can be seen from the expression (1, the inductance of the primary winding is equal to the relative magnetic permeability of the core as a body, i.e., stability the latter determines the stability of the inductance of the winding. The relative magnetic permeability of the core U) is the relative magnetic permeability of the substance of the heart. .nika} d - volume of non-magnetic gasket. Modern magnetic materials have a relatively high relative magnetic permeability, which, however, can vary within wide limits, both from exposure to external conditions and from sample to sample (approximately within 20000-120000). As can be seen from expression (2), the stability of the relative magnetic permeability of the core as a body can be achieved under the conditions of Lcp. Then the relative magnetic permeability of the core as a body (.5) and the inductance of the primary winding 8 of the output transformer 2 is determined by the expression. (6) Therefore, this technical solution allows stabilizing the inductance of the primary winding of the inverter output transformer

and, accordingly, the resonant frequency of the series oscillatory circuit formed by this winding and capacitor 6.

Claims (1)

1. Copyright copyrights of the USSR No. 798766, class, G 05 F 1/56, 1979. V isH - gz ( D .but Jh