SU922696A2 - Dc voltage stabilizer with continuous regulation - Google Patents

Description

The invention relates to electrical engineering and can be used for powering various radio devices.

Basically auth.St. No. 583416 describes a DC regulator with continuous regulation, containing main and p-additional regulating transistors, the collectors of which are connected respectively to the main and p-additional power sources, and the emitters to one of the output terminals of the l-locking transistors, block for control, the input of which is connected to the output terminals, and the base of the main and additional control transistors through the resistors are connected to the output of the unit for control. The emitters of the blocking transistors are connected to the emitters, and the collectors are connected to the bases of the respective additional control transistors, and the base of each of the blocking transistors is connected via a resistor to the collector of the previous control transistor 1.

A disadvantage of the known stabilizer is an increase in the applied component of the output voltage when the control function is switched from one control transistor to another. The frequency of the variable component is equal to the frequency of the rectified voltage if alternating voltage rectifiers are used as the main and additional power sources, for example, from the output of a static converter. If batteries are used as the primary and secondary power sources, the frequency of the variable component is determined by the parameters of the active and passive components.

15 elements of the stabilizer. To eliminate this variable component, it is necessary to install additional filters at the output of the stabilizer, which leads to an increase in the size and mass of the device.

The purpose of the invention is to reduce the variable component of the output voltage, as well as reducing the mass 25 and the dimensions of the stabilizer.

The goal is achieved by the fact that capacitors are switched on in parallel with the transitions of the collector base of the locking transistors.

The drawing shows an electrical diagram of the proposed stabilizer. .

The stabilizer contains control transistors: main 1, additional 2, 3, and 4, locking transistors 5, 6, and 7, resistors 8-t14, control unit 15, input connected to output pins, power sources: main 16, and additional 17, 18 and 19 capacitors 20, 21 and 22 The control transistors and block 15 constitute a closed control loop that maintains the output voltage of the stabilizer unchanged.

The essence of the stabilizer operation is that the load current passes through the regulating transistor, the collector of which has a minimum voltage relative to the emitter. The transistors, 5, 6, and 7, shunt the emitter junction of the respective control transistors, reliably lock them when the voltage on the collector of the control transistor with a lower number is polarized. At the maximum voltage of the sources 1619, the load current only transmits .transistor 1, in the base circuit of which current flows from block 15 through the resistor 6. Simultaneously, the same current from block 15 flows through resistors 9, 10 and 11, however 2, 3, and 4, it does not fall, since transistors 5, 6, and 7, whose base current flows through resistors 12, 13, and 14, are open and saturated. As the voltage of sources 16-19 decreases, the collector decreases transistor 1 approaches zero, while the base current of transistors 5 decreases simultaneously, it goes out of yscheni and current stabilizer load gradually moves from one transistor to the transistor 2. In a further decrease in the voltage source function regulator alternately performed transistors 3 and 4.

At the moments when the function of the regulator transitions from one transistor to another, for example, from transistor 1 to transistor 2, the voltage at the collector-emitter junction of transistor 1 approaches zero. The transistor 1 becomes practically unmanageable. Since the rectifier diodes of the source 17 are in a more stable state, the ripple voltage from the input of the stabilizer is unobstructed.

arrive at the output of the stabilizer through the uncontrolled transistor 1. Part of this variable component falls at the collector-emitter junction of transistor 1, i.e. enters through a resistor 12 to the base-emitter transition of the blocking transistor 5, which, as noted above, at this moment passes from the saturation mode to the active mode. Transistor 5 amplifies these oscillations and they arrive at the base of the regulating transistor 2, to which the function of the output voltage regulator is currently beginning to transition. Thus, multiply amplified oscillations from the stabilizer input are output. The introduction of capacitor 20 leads to the fact that the blocking transistor 5 loses the ability to transmit and amplify alternating voltages. Due to this, the stabilizer does not amplify the oscillations occurring on the control transistor 1. The variable component will now receive a variable directly from the input of the stabilizer. It is well filtered by the rectifier filter and does not exceed units of milliVolts. Similar processes occur on the rest of the control transistors. If batteries are used as power sources 16-19, the oscillations at the output of the stabilizer at the moments of transition of the regulator function from one regulating transistor to another arise because of the self-excitation of the transistor, which at this moment becomes uncontrollable.

Thus, the introduction of capacitors allows to reduce the variable component of the output voltage, as well as by avoiding the use of additional output filters, to reduce the mass, and the dimensions of the stabilizer.

Claims (1)

1. USSR author's certificate 583416, cl. G 05 F 1/56.