SU756385A1 - Stabilized multichannel power supply unit - Google Patents

Description

The invention relates to electrical engineering, in particular to secondary power sources, and can be used to power various radio equipment. five

Known stabilized multi-channel power supply £ £] and £ 2}. The first one contains a pulse voltage converter that operates with a pause at zero, is connected by an input to the input terminals, and the outputs - to the output terminals, and the feedback signal is removed from the auxiliary winding of the power transformer.

The disadvantage of this device is the inability to ensure the stability of the output voltages when the load current changes.

The second, closest to the invention in its technical essence 20 contains a voltage converter, which includes a power transformer, a torus, the primary winding of which is connected to the first input terminal by two extreme leads through the collector transitions of the key transistors-45 tori to the second input terminal terminal, and the base of the key transistors are connected to the outputs of the control circuit, the input of which is connected

2

to the winding of the power transformer, and at least one output winding of the power transformer through the appropriate rectifier and power filter is connected to the input of a linear voltage regulator, the output connected to the output: terminals and made with separate power regulating and preregulating transistors.

The disadvantages of this stabilized multi-channel power supply are:

a) increase in mass and volume due to the need for additional rectifiers and filters designed to supply the pre-regulating transistor of a linear voltage regulator and the complexity of the design of the power transformer;

b) a significant dependence of the efficiency on changes in the input voltage.

The aim of the invention is to reduce the size and increase efficiency in a wide range of input voltages.

• The goal is achieved by the fact that at least one additional circuit is inserted into the stabilized multi-channel power supply unit, consisting of

756385

four

A diode, a choke and a capacitor are connected in series, and the power filter contains inductance and capacitance.

The drawing shows a diagram of a stabilized multi-channel power supply.

The stabilized multichannel power supply includes a voltage converter 1, which includes a power transformer 2, the primary winding 3. of which is connected to the first input terminal through the collector transitions of the key transistors 4, 5, and the middle point to the second input terminal. The base of the key transistors 4, 5 is connected to the outputs of the control circuit 6, the input of which is connected to the winding of the power transformer 2. Output windings

7 .. .7η power transformer 2 through rectifiers 8 ... 8p and filters

9 ... 9η are connected to the input of the linear

stabilizer 10 ... 10p, the outputs of which are connected to the output terminals. .

Linear stabilizers are made with separate power regulating 11 and pre-regulating 12 transistors. The collector of the control transistor is connected to the output of the filter 9, and the collector of the pre-regulation transistor 12 is connected to the junction point of the choke .13 and the capacitor 14, and another terminal of the capacitor 14 is connected to the collector of the control transistor. 11, and the other end of the choke 13 through a diode 15 is connected to the output of the rectifier.

The device works as follows.

When the power supply voltage is connected to the input terminals on the output winding 7 of the power transformer 2 of the voltage converter 1, voltage appears with a pause at zero. This voltage is rectified by the rectifier 8 and through the filter 9 is fed to the input of the linear stabilizer 10. · A stabilized voltage appears at the output terminals.

In this case, a rectangular voltage of the filter inductor 9 is applied to the diode 15, the choke 13 and the capacitor 14 in series. The capacitor 14 is charged while providing an increase in the voltage for the pre-regulating transistor 12.

Thus, the introduction of additional chains consisting of a diode, a choke and a capacitor into a stabilized multichannel power supply unit allows us to simplify the circuit and increase the efficiency of the device.

Claims (1)

Claim A stabilized multichannel power supply unit containing a voltage converter, a power transformer connected to it, the primary winding of which is connected to the first input terminal by two extreme terminals through the collector-emitter junction of the key transistors and the midpoint of the control transistors are connected with the outputs of the control circuit, the input of which is connected to the winding of the power transformer, and at least one output winding of the power transformer through the corresponding The rectifier and power filter are connected to the input of a linear stabilizer, an output connected to the output terminals and a regulating and pre-regulating transistor made with separate power supply, which, in order to reduce overall dimensions and increase efficiency in a wide range of input voltages, into it At least one additional circuit is inserted, consisting of a series-connected diode, choke and capacitor, and the power filter contains inductance and capacitance, with an additional circuit connected in parallel But the choke is a power filter, and the input is a power supply. pre-regulating transistor to the point of connection of the choke and the additional circuit capacitor.