A device for converting pulses

 

(57) Abstract:

The device is designed to convert pulses with reduced steepness of the front and can be used to reduce distortion of the pulse shape while maintaining high conversion efficiency voltage current, as well as to reduce the DC component of the current output device. The device comprises a controlled switch mode power supplies, each of which consists of a source of low voltage and diode at the output, and a high voltage source and managed key included at the output. The exit key is connected with the corresponding electrode of the diode and an output of the power supply, connected to the corresponding power bus terminal push-pull amplifier, the input of which is connected to the pre-amp output and the output with an inductive load in series with which is included decoupling capacitor and the feedback resistor, the output of which is connected to the respective input of the preamplifier. In each of the power supplies in parallel to the diode included the corresponding capacitor. The device also includes a driver control signals, an input connected to the first key in power supply. Effect: reduction of distortion of the pulse shape while maintaining high efficiency and minimize the DC component of the output current. 1 C.p. f-crystals, 3 ill.

The invention relates to a pulse technique, and more particularly to devices for converting pulses with reduced steepness of the front, and can be used to reduce distortion of the pulses while maintaining high conversion efficiency voltage current, as well as to reduce the DC component of the current output device.

For special applications when working on an inductive load, in particular to power the solenoids non-element ring laser with frequency stand on the basis of the effects of Faraday or the Zeeman required highly stable source of alternating current with a given trapezoidal pulse shape and null average value. Typically, such source shall exercise due to the linear transformation in the output voltage of trapezoidal shape with predetermined amplitude and slew rate. In this case, the main task is to ensure efficient conversion of the voltage pulses in the current without distorting their shape, and by m the current for the specified application will result in inadequate control of the ring laser, and the presence in the output current of the constant component may cause shift and drift of the zero of the ring laser.

It is known a device for converting pulses [1], containing connected in series pre-amplifier signal input which is the input device, and terminal push-pull amplifier with an inductive load in series with which is incorporated the feedback resistor, the connection point with the load connected to the corresponding input of the preamplifier, as well as managed switching power sources of high and low voltage.

Device [1] provides high performance and conversion efficiency. However, this requires a high voltage supply for the preamplifier and is achieved by distortion of the pulse shape of the output current and reduce reliability because during the transition process preamplifier gets in key mode and to one of its transistors are in cutoff mode is dual voltage from high-voltage sources.

Closest to the proposed invention is a device for converting pulses [2], contains one soy is ctny amplifier with an inductive load consistently with enabled feedback resistor, the connection point with the load connected to the corresponding input of the preamplifier, as well as managed switch mode power supplies, each of which consists of a source of low voltage diode required inclusion at its output and a high voltage source with controllable key at its output, while the output of the key is connected with the corresponding electrode of the diode and an output of the power supply connected to the corresponding power bus terminal push-pull amplifier, the output of which is also connected with the control input of the key.

Device [2] is intended for the conversion of rectangular pulses and has a higher efficiency and reliability. In the "small signal transistors of push-pull amplifier are powered from low voltage sources, and "large" signal from sources of high voltage (through saturated transistor output stages and public keys).

However, when converting signals with limited slew rate, for example having a trapezoidal shape pulse, during the transition process in the "intermediate" values signalprocessing between output current and input voltage for this device is broken and the form of pulses, as in [1], is distorted. Another disadvantage of the device [2] is the presence in its output current DC component caused by the zero offset of the pre-amplifier, which, as already mentioned, may cause shift and drift of the zero of the ring laser.

From the analysis of level follows that of the known device does not allow you to fully solve tasks effectively (with high efficiency) conversion of voltage pulses with limited slew rate (e.g., trapezoidal) in current without distorting their shape and minimize the DC component of the output current.

Solving these problems has been possible due to the fact that in a device for converting pulses containing connected in series pre-amplifier signal input which is the input device, and terminal push-pull amplifier with an inductive load in series with which is incorporated the feedback resistor, the output of which is connected to the input of the preamplifier, as well as managed switch mode power supplies, each of which consists of a source of low voltage diode required inclusion at its output and the source electrode of the diode and an output of the power supply, connected to the corresponding power bus terminal push-pull amplifier according to the invention introduced shaper control signals, an input connected to the signal input of the preamplifier, and the corresponding output with the control input key corresponding power supply unit, and each power supply in parallel with the diode also includes a capacitor.

The invention consists in the idea of a managed training devices for conditions that occur during the transition process. Namely, in the "outside" part of the period the voltage of the transistors corresponding to (outside) shoulder terminal push-pull amplifier to the beginning of the "working" part increases (in absolute value) to the value at which it is obviously more surges throughout the transition process of changing the direction of the current in the inductive load caused by the change of polarity of the signal at the input device. Moreover, since the transition occurs at the time of the order of the length of the front of pulses at the input device, and the specified excess power is required only at this time. The rest of the time the voltage feed is">

The simplest implementation of this idea was the use of a capacitor as an additional power source installed in the power supply in series with a source of low voltage and recharged from a source of high voltage through the key, open during the "off" part of the period. The operation of key controls" himself the input signal entered through the device driver control signals. So when changing the polarity of the input signal, the switch closes and at the beginning of the "working" part of the period, the capacitor is discharged, and the consumption of the corresponding terminal shoulder push-pull amplifier is (through a diode) only from the source of low voltage.

A feature of this implementation of the invention is that the said emission voltage as would "fit" in the variable voltage supply terminal of the amplifier, never exceeding it, which provides undistorted transformation of the shape of the input pulse signal. But where these emissions are not available, the supply voltage remains at a low level and, thus preserving the high efficiency of the device.

Another feature of this implementation of the invention stems from the fact that kasapo AC. This allows additional replacement OOS DC 100% OOS constant voltage to provide the opportunity to reduce the DC component of the current output device, mainly due to the zero drift of the pre-amplifier, due to the inclusion of a coupling capacitor between the inductive load and a feedback resistor. This possibility prototype has not. An additional advantage of this is that the decoupling capacitor as a result of 100% environmental protection constant voltage will remain at zero voltage. This minimizes the DC component of the output current of the device to the level of the minimum leakage current coupling capacitor (on the order of 10-8A).

It must be emphasized that the invention is found to be insignificant specific design target of push-pull amplifier, because the idea is associated only with a corresponding change in his diet. This amplifier can be performed similarly to the prototype or as indicated in the example embodiment of the invention. Equally insignificant and the specific design of the pre-amplifier, formirovanie clear from the above, in no way associated with these structures. Essentially only the presence of these elements in the device, and their design is for illustrative purposes only but not for limitation of the invention.

The analysis of the nature of the invention and features of its implementation proves the validity of the choice of total essential features describing the inventive device for converting pulses, and the presence among them of the distinctive signs indicates compliance of the claimed invention, the patentability requirements of novelty.

The analysis of the prior art follows that the task was set by the authors for the first time, and its solution using a capacitor that is charged by using the driver control signals, for "entering" emission voltage caused by transients in variable accordingly the supply voltage terminal push-pull amplifier, allowing you to retain the shape of the input pulses and high efficiency devices have not been applied in two decisions in this or related areas of technology. This allows us to conclude that the claimed invention meets the patentability requirements and izobretatelnee. In Fig.1, 2 shows a schematic diagram of the device according to the invention and its individual elements. In Fig.3 presents plots of signals in some characteristic points of the circuit of Fig.1.

A device for converting pulses (Fig.1) contains a connected in series pre-amplifier 1, a signal input which is the input device, and terminal push-pull amplifier 2 with an inductive load 3, in series with which is included the resistor 4 feedback, the output of which is connected to the appropriate input of the pre-amplifier 1, and the managed switching power 5 (6), each of which consists of a source 7 (8) low voltage, managed key 9 (10), is included at the output of source 11 (12) high voltage, and diode 13 (14), included in the desired direction at the output of the source 7 (8) low voltage. When this exit key 9 (10) is connected with the corresponding electrode of the diode 13 (14) is the output of the power supply 5 (6) connected to the positive (negative) power supply terminal push-pull amplifier 2, and parallel to the diode 13 (14) also includes a capacitor 15 (16). The device also includes an imaging unit 17 of the control signals, the input of which is m key 9 (10) power supply 5 (6). Specific performance of the amplifiers 1, 2 are shown in Fig.1 inside contours, circled in phantom line, and the keys 9, 10 and shaper 17 is within the external contours, circled by the dashed line.

Constant voltage across the resistor 4, the feedback is equal to the zero offset of the pre-amplifier 1, determines the level of the DC component in the output current of the device. As already mentioned, the present invention allows the decrease in the distortion of the pulse shape to reduce this level. For this purpose in the scheme of the device (Fig.2) added chain 18 feedback constant voltage circuit 19 feedback AC and decoupling capacitor 20 connected between the load 3 and the resistor 4 feedback, and referred to the output of the resistor 4 is connected to the appropriate input of the pre-amplifier 1 through the circuit 19, and the connection point of the load 3 with a dividing capacitor 20 is connected to the same input of the pre-amplifier 1 through the circuit 18.

The device operates as follows (Fig. 1, 3). At the entrance of the pre-amplifier 1 receives the alternating voltage of trapezoidal shape with zero mean value (signal type 3.1). the tis from the sign of this signal. The positive sign corresponds to the closed state key 9 and the open state of the key 10, the negative sign of the state of the keys will change to the opposite. In the latter case, the power terminal of push-pull amplifier 2 occurs through the diode 14 from source 8 low negative voltage, and the consumption from the source 7, a positive voltage is almost non-existent. The capacitor 15 through the public key 9 is charged to a high positive voltage source 11 (see curve 3.2) and supports this bus voltage is a positive power amplifier 2 during the whole transition process of changing the direction of current in the load 3. The value of the positive voltage pulse at the output of the amplifier (curve 3.3), produced as a result of the total environment "fit" under the curve 3.2 voltage on the capacitor 15, never surpassing it, and provides thus given by 3.1 signal at the input of the amplifier 1, the slew rate of the output current curve (3.5) in the inductive load 3. At the beginning of the positive half-cycle of the output current of the capacitor 15 is discharged (key 9 is closed) and the consumption of the amplifier 2 is through the diode 13 from the source 7 low polojitelnaya source 12 (see curve 3.4) and it supports bus voltage negative power amplifier 2 during the whole transition process of changing the direction of current in the load 3. Next, this procedure is repeated and, thus, the effect of feedback during the transition process is not interrupted (unlike the prototype) and thus provides linear undistorted transformation of the shape of the input pulse signal while maintaining the high efficiency of the device.

It should be noted that the described control mode state of the keys 9, 10, depending on the character input device of the fair for the case of conversion pulses without inversion. To convert pulses with inverse correspondence between the sign of the input signal and the state of the keys is reversed, i.e., for example, a positive value of the input signal corresponds to the closed state of the key 10 to the negative bus of the power supply and open state key 9 bus positive power.

In circuit solution Fig.2, the device works in a similar way. The level of the DC component in the output current of the device is determined by the leakage current coupling capacitor 20 and the input current will precede small (of the order of 10-9A), the minimum leakage current coupling capacitor (on the order of 10-8A) is achieved by a small applied DC voltage equal to the zero offset of the pre-amplifier 1 as a result of introduced 100% feedback voltage.

Since the implementation of the described embodiments of the invention are well-known items and blocks the production of which is mastered by the industry, it can be considered that the claimed invention meets the patentability requirements of industrial applicability.

These and other embodiments, however, cannot be considered as limitations of the invention. They are, as already mentioned, the only illustrations to better understand its essence, which is fully described in the claims.

Literature

1. USSR author's certificate N 410548, CL H 03 K 6/02, 1974.

2. USSR author's certificate N 1084956, CL H 03 F 3/26, 1984.

1. A device for converting pulses containing connected in series pre-amplifier signal input which is the input device, and terminal two-stroke Wuxi is dglucan to the appropriate input of the pre-amplifier, and also managed switch mode power supplies, each of which consists of a source of low voltage diode required inclusion at its output and a high voltage source with controllable key at its output, while the output of the key is connected with the corresponding electrode of the diode and an output of the power supply connected to the corresponding power bus terminal push-pull amplifier, characterized in that it introduced the driver control signals, an input connected to the signal input of the preamplifier, and the corresponding output with the control input key corresponding power supply unit, and each power supply in parallel with the diode also includes a capacitor.

2. The device under item 1, characterized in that it additionally introduced decoupling capacitor is connected between the load and the feedback resistor, and referred to the output of the resistor connected to the corresponding input of the pre-amplifier through the feedback circuit to alternating current, and a connection point of the load with a dividing capacitor connected to the same input of the pre-amplifier through a feedback circuit for constant voltage.

 

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