SU1700540A1 - Pulse power supply source - Google Patents

Description

one

(21) A681730 / 07

(22) 03/15/89

(46) 12/23/91. Bul V m

(71) Kursk Production Association Accountmash

(72) A.A. Fursov

(53) 621.316.722.1 (088.8)

(56) USSR Author's Certificate No. 1115177, cl. H 02 M 3/335, 1983.

Veresov G.P. and others. Stabilized power sources of radio equipment. M .: Energie, 1978, p. 172

Fig.6.33.

(PULSE POWER SUPPLY

(57) The invention relates to the secondary power supply sources of electronic equipment. The aim of the invention is to expand the allowable range of input voltage variation. The two-transistor switch 2 of the voltage converter is controlled by the voltage taken from the control windings of the control transformer. Its switching frequency is determined by the recharging time of capacitors 6 and 12. The output voltage of the two-transistor switch 2 of the voltage converter is fed through a magnetic amplifier 9 to the power transformer 17 and then through the output rectifiers and filters 18 to the output terminals. Control unit 16 changes the conductivity of the magnetic amplifier 9 and keeps the output voltage at the required level. An increase in the voltage drop on the magnetic amplifier 9 in the process of adjusting the output voltage through diode 7 and limiting resistor 8, as well as diode 10 and limiting resistor 11 reduces the overcharging time of capacitors 6 and 12, increasing the frequency of switching of the two-transistor switch 2, causes an additional increase in the resistance of the magnetic amplifier 9. 1 sludge.

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The invention relates to electrical engineering and can be used in secondary power supplies of automation and computer technology.

The purpose of the present invention is to expand the allowable range of input voltage variation.

The drawing is a pulsed power supply diagram.

The switching power supply contains an input filyr 1, which is connected to a two-transistor switch 2 voltage converter, a node

3 starts of the control transformer k, the limiting resistor 5 and the capacitor 6 of the first resistive-capacitive circuit, the diode 7 and the limiting resistor 8 of the first resistive-diode circuit of the magnetic amplifier 9, the diode 10, the limiting resistor 11 of the second resistive-diode circuit, capacitor capacitor 12, limiting resistor 13 of the second resistive-capacitive circuit, And and 15 protection nodes, control unit 16, power transformer 17 output rectifiers and filters 18, diodes 19 and 20.

ABOUT

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inlet filter 1 input connected

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with the input pins, and the output is connected to the input of the two-transistor switch 2 of the power converter. The output pins of the switch 2, shunted by the feedback winding of the control transformer, are connected through the working winding of the magnetic amplifier 9 to the input winding of the power transformer 17, the output windings of which are connected to the output pins through appropriate rectifiers. The input control unit 16 is connected to the output terminals, and the output is connected to the control winding of the magnetic amplifier 9 Communication windings of the magnetic amplifier 9, respectively, through the diode 7 and the limiting resistor 8, as well as the diode 10 and the limiting resistor 11 of the first and second diode The circuits are connected to the first control pins of the transistors of the two-transistor switch 2 of the voltage converter. Parts of the control windings of the control transformer of the two-transistor switch 2 voltage converter, located between the middle and first terminals of these windings through resistive-capacitive circuits formed by the capacitor 6 and the limiting resistor 5, and the capacitor 12 and the limiting resistor 13i are connected to the second control resistor the leads of the transistors of the two-transistor switch 2 of the voltage converter. The free leads of the control windings of the control transformer k through diodes 19 and 20 are connected to the middle points of the resistive-diode circuits. A start node 3 is connected between the auxiliary output of the input filter 1 and one of the control pins of the two-transistor switch 2 of the voltage converter. The protection nodes 1 and 15 are connected respectively to the control terminal of one of the transistors of the two-transistor switch 2 of the voltage converter and the output terminals. When power is turned on and the voltage from filter I is fed to the input of a two-transistor switch

thirty

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neither opens it. With the opening of the transistor of the push-pull transistor switch 2, the voltage converter on the winding of the control transformer h results in a polarity that through the capacitor 6 and the resistor 5 it will support the open state of the first transistor, and through the capacitor 12 and the resistor 13 - the closed state of the second transistor. As the capacitor 6 is charged, the bias voltage across the diode 20 and the resistor 8 will close the first transistor of the two-transistor of switch 2 of the voltage converter and on the windings of the control transformer 4 the polarity of the voltage will be reversed. the second transistor of the two-transistor commutator 2 of the voltage converter opens through the capacitor 12 and the resistor 13. The second transistor closes as the capacitor 12 is charged by the bias voltage across the diode 19 and the resistor 11 and the process repeats.

With the start of operation of the two-transistor switch 2 of the voltage converter, the alternating voltage through the working winding of the magnetic amplifier 9 goes to the power transformer 17, from which it goes through the rectifier and filters 18 to the load. When the specified voltage level is reached, the error voltage acts on the control unit 16, which introduces the magnetic amplifier 9 into the stabilization mode. When entering the stabilization mode, a pulse voltage appears on the windings of the chokes of the magnetic amplifier 9, which is supplied to the two-transistor switch 2 of the voltage converter, to its first transistor through diode 7 and the limiting resistor 8, to the second transistor through diode 10 and the limiting resistor 11. The negative polarity impulse voltage from the chokes of the magnetic amplifier 9 is summed with the positive half-period of the control transformer k, coming through the corresponding

2 converters and node 3 start. Cig-15 capacitor and resistor. The sum of two from the start-up node 3 is fed to the control input of the two-transistor com-puls voltage to determine the recharge rate of the capacitors 6 and 12, i.e. switching frequency

mutator 2 converter 0

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five

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neither opens it. With the opening of the transistor of the transponder switch 2 of the voltage converter on the winding of the control transformer h, the voltage of the polarity is such that through the capacitor 6 and the resistor 5 it maintains the open state of the first transistor, and through the capacitor 12 and the resistor 13 - closed the state of the second transistor. As the capacitor 6 is charged, the bias voltage across the diode 20 and the resistor 8 will close the first transistor of the two-transistor switch 2 of the voltage converter and on the windings of the control transformer 4 the polarity of the voltage will change to the opposite value, i.e. the second transistor of the two-transistor commutator 2 of the voltage converter opens through the capacitor 12 and the resistor 13. The second transistor closes as the capacitor 12 is charged by the bias voltage through the diode 19 and the resistor 11 and the process repeats.

With the start of operation of the two-transistor switch 2 of the voltage converter, the alternating voltage through the working winding of the magnetic amplifier 9 goes to the power transformer 17, from which it goes through the rectifier and filters 18 to the load. When the specified voltage level is reached, the error voltage acts on the control unit 16, which introduces the magnetic amplifier 9 into the stabilization mode. When entering the stabilization mode, a pulse voltage appears on the windings of the chokes of the magnetic amplifier 9, which is supplied to the two-transistor switch 2 of the voltage converter, to its first transistor through diode 7 and the limiting resistor 8, to the second transistor through diode 10 and the limiting resistor 11. The negative polarity impulse voltage from the chokes of the magnetic amplifier 9 is summed with the positive half-period of the control transformer k, coming through the corresponding

15 capacitor and resistor. The sum of two capacitor and resistor. The sum of two

pulsed voltages determine the recharge rate of capacitors 6 and 12, i.e. switch frequency

l170

2. With increasing supply voltage or load shedding, the voltage on the windings of the chokes of the magnetic amplifier 9 increases, which leads to an increase in current and, consequently, a decrease in the recharging time of capacitor 6 and 12. The frequency of the two-transistor switch 2 of the voltage converter increases. Increasing the frequency leads to an increase in the reactance of the magnetic amplifier 9. With a decrease in the supply voltage or with an increase in the load on the windings of the chokes of the magnetic amplifier 9, the pulse voltage decreases, which leads to a decrease in current and an increase in the overcharging time of the capacitors 6 and 12. As a result is a decrease in the frequency of operation of the switch 2, which leads to a decrease in the reactance of the magnetic amplifier 8. Thus, the frequency control of the operation of the two-transistor switch 2 n voltage converter together with the action of the feedback amplifier leads to an increase in the output control range on

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at various disturbances for the continuous windings of the control transformer, both the mains voltage and the load. The control of switch 2 during overloads and signaling of them is carried out by supplying a negative voltage from the winding of the control transformer k that exceeds the opening level of the arms through the protection node 1. The node 1A is controlled through the node 15.

Claims (1)

Invention Formula A pulsed power source containing a series-connected input filter and a two-transistor switch of a voltage converter with a control transformer having a feedback winding and the first control winding with an average output, a power transformer, the output windings of which are connected to the power supply through a series-connected rectifier and filters corresponding output pins, a control unit, an input connected to one of the input pins, a magnetic amplifier, through the working winding wherein the input winding of the power transformer soe45 50 55 The mator is compatible with the first terminals of the first and second windings of the magnetic amplifier, respectively, connected to the second control terminals of the transistors of the two-transistor switch of the voltage converter, the first terminals of the first and second control windings of the control transformer of the two-transistor switch of the voltage converter, respectively, through the first and the second capacitor is connected to the second pins of the first and second limiting resistors, the second pins of the first and second resistors connections of the magnetic amplifier through the corresponding chains consisting of a series-connected first diode and a third limiting resistor, and a second diode and a fourth limiting resistor are connected to the first terminals of the first and second limiting resistors, respectively, the second terminals of the first and second control windings of the control transformer two-transistor switch voltage converter, respectively, through the third and fourth diodes five 0 five the power output terminals of the two-transistor switch of the voltage converter are shunted by the feedback winding of the control transformer, and the control winding of the magnetic amplifier is connected to the control output terminal, the first and second limiting resistors, the first terminals of which are connected respectively to the first control terminals of the transistors of the two-transformers a voltage converter switch, a third limiting resistor, and four diodes, the input filter input connected to input pins, which are related to the fact that, in order to expand the allowable range of input voltage, a fourth limiting resistor and two capacitors are inserted into it, the control transformer of the two-transistor voltage converter switch is equipped with a second control winding with a midpoint, The magnetic amplifier is equipped with two communication windings, the middle terminals of the first and second controllers 5 0 The driving windings of the control transformer are 5 0 five The mator is compatible with the first terminals of the first and second windings of the magnetic amplifier, respectively, connected to the second control terminals of the transistors of the two-transistor switch of the voltage converter, the first terminals of the first and second control windings of the control transformer of the two-transistor switch of the voltage converter, respectively, through the first and the second capacitor is connected to the second pins of the first and second limiting resistors, the second pins of the first and second resistors connections of the magnetic amplifier through the corresponding chains consisting of a series-connected first diode and a third limiting resistor, and a second diode and a fourth limiting resistor are connected to the first terminals of the first and second limiting resistors, respectively, the second terminals of the first and second control windings of the control transformer two-transistor switch voltage converter, respectively, through the third and fourth diodes 17