RU128801U1 - DC SOURCE PULSE ACTION - Google Patents

Abstract

A pulsed-action direct current DC power source containing a bridge type inverter made on key devices, a control device connected to its outputs with the key devices, a first inductance connected to the first output of the inverter’s AC diagonal, and the other to the first capacitor, wherein the connection point of the first inductance and the first capacitor is connected to the first input terminal of the transformer, which is connected in series with the rectifier, p therefore, connected to the filter, and the inverter’s DC diagonal and the control device inputs are connected to a DC voltage source, characterized in that two additional diodes are connected in series with each other by their first terminals, a second capacitor connected in series with the first capacitor, and the second inductance, while the diodes are connected by their second terminals to the diagonal of the inverter DC current in the direction opposite to the flow direction the input current, and a connection point between a diode via a second inductance is connected to the junction point between a capacitor, the second capacitor while its second terminal connected to the second input terminal of the transformer and the second terminal of the diagonal AC inverter.

Description

The inventive utility model relates to pulsed technology and signal transmission using radio waves, in particular to power sources (IES) of radio transmitting devices (RPUs), namely, power sources whose operation is based on converting direct current energy at the source input to direct current energy at its output with an intermediate conversion to alternating current, and performed on semiconductor devices.

For modern IED RPU radar stations (radar), including mobile, high demands are placed on operational and electrical parameters, efficiency, as well as weight and size characteristics.

Known continuous-mode IES for RPU with a continuous voltage regulator that simultaneously performs the function of an active filter (see, for example, "Designing power supplies for electronic equipment" study guide Berezin OK, Kostikov VG and others; edited by Shakhnov V .A. 4th ed., Revised and enlarged M .: KNORUS, 2010, p.317, Fig. 2.105) containing an input transformer, an input rectifier with an input filter, a regulating component of continuous operation (electrovacuum device) controlled by a DC amplifier feedback signals from the output of IEP, and an output filter. A sinusoidal voltage is applied to the input of the IED, so its output voltage has a low ripple level. The stability of the output voltage is ensured by the continuous action of the regulatory component.

The disadvantages of this IED are its large overall dimensions and weight due to the large overall dimensions and mass of the low-frequency transformer and other input components used in it, which also limits the use of the IED in the RPU of mobile radars.

Known sources of DC power supply of pulsed action, which implement a different principle of operation compared with the aforementioned continuous-current electric current transducers, namely, the conversion of the input DC voltage to an alternating or pulsating voltage of a rectangular shape and high frequency, followed by transformation and rectification.

These IEDs are based on an inverter using high-frequency active and reactive components and have a smaller mass and overall dimensions compared to continuous-acting IEDs.

However, due to the rectangular shape of the inverter output voltage, such pulsed-type IEDs have high ripple levels and output voltage instability, which is unacceptable during operation of the IEDs in the RPU.

In order for the pulsed power supply to provide low ripple and instability of the output voltage, it is necessary that the inverter output voltage supplied to the transformer be converted to a sinusoidal voltage.

An example of such an IED is a pulsed power supply (see, for example, description to the author's sv-vu of the USSR No. 1091291, MKI: Н02М 3/335, application No. 3514364 of 11.24.1982, "Voltage converter" authors V. V. Popov and Patsevich V.E.), containing an inverter with a rectangular shape of the output voltage, made according to a half-bridge circuit with two pairs of transistors switched by control devices, a resonant LC circuit tuned to the frequency of the first harmonic of a sequence of rectangular pulses, and a load made, for example, in vi de series-connected transformer, rectifier and filter.

Due to the presence of a resonant circuit between the inverter and the transformer, a sinusoidal voltage is applied to the input of the latter.

The disadvantage of this device is that during the operation of the device the required low ripple and instability of the output voltage can not be obtained in the entire range of the output current. So, with a small value of the output current (usually below 10% of the nominal), when the voltage in the circuit passes through the zero value, large short-term inrush currents occur due to a significant change in the flux linkage in the transformer magnetic circuit (see the article “Non-linear electrical circuits” A. Bessonov Higher school, 1964, 431 pp.), Resulting in an increase in the quality factor of the resonant circuit, which leads to an increase in the voltage at its output and, accordingly, an increase in the level of ripples and instability of the output voltage of the IED e allowable values (values at which normal operation is ensured PAR). Thus, at low values of the output currents, this IEP does not provide the required stability and the level of ripple of the output voltage, which limits its operational capabilities.

The solution that is closest in purpose and technical essence - the prototype is an electric power source based on an inverter using a bridge circuit with a forming (resonant) circuit in the diagonal of an alternating current (see article A. Polishchuk, A. Yu. Mlinnik, S. Monin. V., Kazantsev V.I. “Highly efficient sources of secondary power supply for microwave transmitting devices”, Vestnik MGTU im. NEBaumana, Priborostroenie series, 2000, No. 4 (41). - p. 101, Fig. 1).

This IED contains an inverter on four key devices - transistors with a control circuit for them, to which the DC input voltage is supplied to the DC diagonal, and the inductance and capacitance (capacitor) connected to its outputs with the transformer inputs are connected to the outputs of the AC diagonal which connected in series with each other a rectifier and a rectified voltage filter.

The disadvantage of this IED is that for small values of the output current (usually below 10% of the nominal), the required stability and level of ripple of the output voltage are not provided, since large short-term inrush currents occur at the moment the voltage in the circuit passes through the zero value due to the significant a change in flux linkage in the transformer’s magnetic circuit, resulting in an increase in the quality factor of the resonant circuit, which leads to an increase in the voltage at its output and, accordingly, to an increase in the pool level can be measured directly and instability of the output voltage higher than the IEP of acceptable values. Thus, at low values of the output currents, this IEP does not provide the required stability and the level of ripple of the output voltage, which limits its operational capabilities.

The technical result, which is achieved by using the proposed technical solution, is to expand the operational capabilities of the power source by ensuring the required quality of its output voltage and at low values of the output current, that is, in almost the entire operating range of the output current.

In addition, the proposed utility model expands the arsenal of well-known technical means of a similar purpose.

The technical result is achieved by the fact that to a direct current power supply of a pulsed action, comprising a bridge type inverter made on key devices, a control device connected to its outputs with said key devices, a first inductance connected to a diagonal of the inverter by a first output and another conclusion - with the first capacitor, while the connection point of the first inductance and the first capacitor is connected to the first input terminal of the transformer, which the second one is connected in series with the rectifier connected in series with the filter, and the inverter DC diagonal and the control device inputs are connected to the DC input voltage source, two additional diodes are connected in series, connected in series with each other, the second capacitor connected in series with the first capacitor, and the second inductance, while the diodes are connected by their second terminals to the diagonal of the inverter DC current in the direction opposite to the direction the flow of the input current, and the connection point of the diodes to each other through the second inductance is connected to the connection point of the capacitors to each other, and the second capacitor is connected to the second input terminal of the transformer and to the second terminal of the diagonal of the alternating current of the inverter by its second output.

The proposed utility model is illustrated in the drawing, where

- figure 1 presents the functional diagram of the IED of direct current pulsed action;

- figure 2 presents the waveforms of voltages and currents, explaining the principle of operation of the IED of direct current pulsed action, where:

- figa shows a waveform of voltage u _inv at the inverter output;

- on figb - waveform of the input current i _{in the} forming circuit;

- on figv - waveform of the voltage u _LC on the capacitors of the circuit;

- in Fig.2d and 2D - waveforms of currents i ₇ and i _{8 of} diodes 7 and 8, respectively;

- Fig.2E is a waveform of voltage u ₁₀ at the second inductance.

The power source (see Fig. 1) contains a bridge type inverter 1 on key devices 2, 3, 4 and 5 connected to the outputs of the control device 6, and two series-connected by the first terminals of the diode 7, 8, the second terminals of which are connected to the diagonal of the direct current of the inverter 1 in the direction opposite to the direction of flow of the input current of the IED, two inductors 9, 10 and two series-connected by the first terminals of the capacitor 11 and 12. The first inductance 9 is connected to the first terminal of the diagonal the alternating current of the inverter 1, and the other terminal with the second terminal of the capacitor 11, while the connection point of the first inductance 9 and the first capacitor 11 is connected to the first input terminal of the transformer 13. The connection point of the diodes 7 and 8 through the second inductance 10 is connected to the connection point between each other the first conclusions of the capacitors 11 and 12. The second capacitor 12 with its second output is simultaneously connected to the second input terminal of the transformer 13 and to the second terminal of the diagonal of the alternating current of the inverter 1. The transformer 13 after atelno connected to the rectifier 14 which is connected in series with the filter 15. Diagonal DC inverter DC inputs 1 and the control device 6 are connected to a source of input voltage (not shown). The outputs of the filter 15 are outputs of a pulsed DC power supply.

As key devices of the inverter can be used, for example, transistors or thyristors.

The power source operates as follows. The voltage U _I DC is supplied to the input of the inverter 1. Key devices - transistors 2, 3, 4 and 5 - according to the commands of the control device 6 in accordance with a given program convert the voltage U _I DC into a sequence of rectangular pulses of voltage u _inv (figa ) The resonant LC circuit (components: 9, 10, 11, and 12), tuned in resonance with the frequency of the inverter 1, extracts the first harmonic from the sequence of rectangular voltage pulses u _inv , converting the square voltage to the sinusoidal voltage u _LC (Fig.2c). _Cmax Maximum voltage U on the total capacitance of the capacitor circuit equal to C = C ₁₁ × C ₁₂ / (C ₁₁ + C _12), defined by the expression u = U _{Cmax Bx} × Q _LOAD where Q _LOAD - loaded quality factor circuit. Thus, the input current i _{in of the} resonant circuit (Fig.2b) and the voltage u _LC at its output (Fig.2c) have a sinusoidal shape, while the input current of the circuit coincides in phase with the input voltage pulses u _inv .

With increasing load resistance (RPU), the output current of the IED decreases and therefore the quality factor of the circuit increases, which leads to an increase in current through the key devices 2, 3, 4 and 5 and an increase in voltage across the capacitors 11 and 12 and at the input of the RPU. In the first (conditionally positive) half-cycle (with open transistors 4 and 3), when the voltage across the capacitor 12 reaches half the input voltage u _in , the diode 7 opens and the capacitor 12 is discharged through an inductance 10 that performs the function of a choke, and diode 7 to the input source voltage (Fig.2g). In this case, the resonant LC circuit is loaded, giving part of the stored energy to the input voltage source. In the next (conditionally negative) half-cycle (with open transistors 2 and 5), similar processes occur, but the discharge of the capacitor 12 occurs already through the diode 8 (Fig.2d). The voltage across the inductance 10 varies according to the law shown in FIG. The resulting voltage of the sinusoidal current is transmitted to the secondary winding of the transformer, then it is rectified, filtered and fed to the input of the RPU.

The threshold for the inclusion of diodes 7 and 8, as well as the required level of the output voltage of the resonant circuit, is set by choosing the parameters of the capacitors 11 and 12 and inductance 10. Moreover, the circuit formed by the capacitor 12 and inductance 10 must be tuned to the resonance with the operating frequency of the inverter 1 to prevent distortion IEP output voltage forms.

Therefore, when the output current decreases below a certain level consumed by the RPU, the resonant LC circuit is automatically loaded, which limits the input current of the circuit and maintains the output voltage of the IED at the required ripple and stability level, that is, the required ripple level and stability of the output voltage are provided over the entire range of output currents, which extends the operational capabilities of the IED, in particular, makes it possible to use it in a radio transmission ing devices of radar stations, including mobile.

The claimed device can be manufactured according to well-known rules on the basis of components manufactured by the industry, therefore, its technical implementation and, therefore, industrial applicability, according to the authors, is beyond doubt.

Claims (1)

A pulsed-action direct current DC power source containing a bridge type inverter made on key devices, a control device connected to its outputs with the key devices, a first inductance connected to the first output of the inverter’s AC diagonal, and the other to the first capacitor, wherein the connection point of the first inductance and the first capacitor is connected to the first input terminal of the transformer, which is connected in series with the rectifier, p therefore, connected to the filter, and the inverter’s DC diagonal and the control device inputs are connected to a DC voltage source, characterized in that two additional diodes are connected in series with each other by their first terminals, a second capacitor connected in series with the first capacitor, and the second inductance, while the diodes are connected by their second terminals to the diagonal of the inverter DC current in the direction opposite to the flow direction the input current, and a connection point between a diode via a second inductance is connected to the junction point between a capacitor, the second capacitor while its second terminal connected to the second input terminal of the transformer and the second terminal of the diagonal AC inverter.

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