SU637940A1 - Electromagnetically-excited generator voltage regulator - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular to voltage regulator circuits for electromagnetic excitation autotractor generators.

Voltage regulators are known that have overvoltage protection of the output composite transistor l.

The closest technical solution to this invention is a voltage regulator for generators with electromagnetic excitation, for example, of an autotractor type, containing an output composite transistor as a regulating element, an input transistor, connected to a feedback circuit, an overvoltage protection circuit through a control circuit and filtering voltage pulsations 2J.

In this scheme, protection of 6m overvoltages is carried out with the help of a chain consisting of a zener diode and a resistor. The chain is connected between the positive terminal of the controller and the base of the output transistor. To filter the input voltage ripple in the circuit, there is a capacitor connected between the collector and the base of the input transistor. Feedback

the circuit provides a chain of a series-connected capacitor and a resistor. The disadvantage of this scheme is

complexity and lack of manufacturability. It requires the presence of two capacitors and additional protection circuit elements in the voltage regulator, one of which is a semiconductor device. With the integral design of the controller, this complicates the technology, which, when mass production of regulators, significantly increases the cost price.

The purpose of the invention is to simplify the controller.

Claims (1)

This is achieved by the fact that, in the proposed voltage regulator, overvoltage protection elements and voltage ripple filtering elements are made in the form of a chain containing a series-connected capacitor and a resistor, the capacitor being connected to the collector of the output transistor, the resistor being connected to the collector of the input transistor , and the common terminal of the capacitor and resistor is not connected directly to the base of the output composite transistor. The drawing shows the principal electrical circuit of the regulator, where the stator winding 1 of the generator is connected to the power supply via rectifier 2, and the excitation winding 3 is connected to the collector circuit of the output composite transistor 4 connected to the input transistor 6 through the collector circuit of the input transistor 6, Regulator also contains., a chain of series-connected capacitor 7 and resistor 5, resistor 8 positive feedback and resistor 9, voltage divider, made on the Zener diode 10 and resistors 11, 12. In addition In the circuit, there is a diode 13 connected in parallel to the field winding. The voltage regulator operates as follows. Until the generator reaches a predetermined voltage level, the voltage drop across resistor 12 is not enough to pass through the stabilizer 10 the current required to unlock the input transistor 6 bypassing the control circuit of the output compound transistor 4. The base current of the output compound transistor 4 flows through the circuit: plus generator , resistor 9, resistor 5, base-emitter transitions of the output composite transistor 4, the total minus (mass) of the generator. The output of the composite transistor 4 is in the saturation state, the resistance of its collector-emitter transition is small. At the same time, the generator excitation current flows through the circuit: the generator plus, the excitation winding 3, the collector-emitter junction of the composite transistor 4, the total minus {mass) of the generator. The excitation current increases until the generator voltage reaches a predetermined level, when the current through Zener diode 10 becomes sufficient to unlock the input transistor b. The junction collector of the input transistor 6 shunts the output circuit of the output composite transistor 4 and the latter is closed. The field winding current 3 is not interrupted, and due to the presence of diode 13, is gradually reduced until the generator voltage reaches a level at which the input transistor is turned off. The process repeats. The generator voltage is maintained at a predetermined level by varying the magnitude of the excitation current by changing the open and closed state of the output composite transistor 4. The voltage ripple filtering is provided in the output cascade of the controller with a capacitor 7, tor. high frequency feedback. The high gain of the output compound transistor allows the use of a small capacitor and dispense with a filter in the input circuits of the controller. To provide the required frequency and clear switching of the transistors, the regulator has a positive feedback chain implemented by one element — resistor 8. Capacitor 7 in combination with resistor 5 forms a chain that protects the output composite transistor 4 from overvoltages. When overvoltages occur, the capacitor 7 is charged through the base-emitter junctions of the output composite transistor 4, including it for the charging time, which eliminates the occurrence of high voltage on the collector. Direct connection of the capacitor 7 to the base of the output compound transistor 4 ensures the quenching of very short overvoltage pulses, since its charge time constant is rather small. The surge voltage is increased by the resistor 5 preventing the charging of the capacitor 7 through the open input transistor 6. The resistor 5 can be linear or non-linear. The use of non-linear resistance increases the effect of reducing overvoltages. However, in this case, the self-excitation of the generator set deteriorates, which is undesirable, especially for tractor generator sets operating under operating conditions often without a battery. Claims of the invention Voltage regulator for electromagnetic excitation generators, for example, of an autotractor type, containing an output composite transistor as a regulating element, an input transistor, connected to a feedback circuit, overvoltage protection elements and filtering voltage pulsations through a control circuit , distinguished by the fact that, in order to simplify the control circuit, the elements of overvoltage protection and filtering of voltage pulsations are made in the form of a chain consisting of Inonii capacitor and a resistor, wherein the capacitor is connected to the collector of the output transistor of the composite, the resistor connected to the collector of the input transistor, and the common terminal of the capacitor and resistor 56379406 It is connected directly to the base of vy- Patent of the USSR 321032, a fast compound transistor. cl. H 02 R 9/30, 1971. Sources of information accepted in 2, Patent of France I 2104205,. Attention during examination: Cl. H 02 I 7/00, 1969.