Two-stroke key amplification cascade

 

(57) Abstract:

Refers to the Converter equipment and can be used in voltage converters. Two-stroke key amplification cascade contains the first and second semiconductor amplifying managed keys 1 and 2, connected them in parallel to the inputs of the first and second two-port shunt 3 and 4, the decoupling capacitor 5, the load 6, the voltage sources 7 and 8, and amplifying semiconductor managed keys 1, 2 are switched alternately, during each half-cycle in series with the load, but not connected in series with each other relative to the source voltage. To ensure the conditions of current flow are two-port shunt. This inclusion reduces end-to-end currents, speeds up the switching process and reduces the dynamic losses. 2 Il.

The invention relates to electrical engineering and can be used in the Converter equipment.

Two-stroke cascades are widely used in various fields of radio engineering and Converter equipment mainly in those cases when it is necessary to obtain the relatively high output power and high efficiency.etessami when switching semiconductor devices, were minimal.

One of the reasons leading to such loss, is the presence of through-current.

There are a number of technical solutions aimed at reducing the through current and the losses associated with it. In particular, in the known push-pull amplifier stage (SU, 1205252, H 03 F 3/26) that contains the output transistors of the same conductivity to achieve the desired technical result we introduce a special capacitor connected between the base resistors of the output transistors. The result is achieved thanks are due to the presence of the capacitor of the delay of the closed transistor.

In the device according to (SU, 1462466 A 1), representing two-stroke key the amplifier to achieve the desired result, use is additionally introduced the throttle, also perform the function of delay.

A common shortcoming of the methods used is a fixed time delay, which leads to the achievement of result at a certain current for a key with a certain speed. Therefore, when the calculation of the elements necessary to consider the variation of frequency and amplification properties key used transistors that creates some used in (ed.St. N 512556, H 03 F 3/26). In this push-pull amplifier, which is a prototype, introduced two managed switching quadrupole. The technical result is achieved due to the fact that each quadrupole bypasses the input of one transistor while in the base circuit of another current flows. This remedy through current does not need specially calculated castotnozawisimaya elements, which eliminates the necessity of taking into account the frequency properties of the used keys. However, its disadvantage is the form in which it is used in the prototype, is that as the control delay of the signal is not itself a pass-through current, and its base, and these currents, generally speaking, are not a strict one-to-one correspondence. In addition, when such a scheme is difficult to obtain reliable closing of the key as a simple bypass surgery is often insufficient in powerful high-voltage cascades and require the submission of additional locking bias. To disadvantage and relative complexity of the prototype, which reduces reliability and increases the cost.

In the proposed two-stroke key amplifying cascade prototype disadvantages are eliminated. Excelling p is a voltage source, that extends its functionality.

In Fig. 1 and 2 presents a functional and schematic diagram of the device.

Two-stroke key amplification cascade contains two semiconductor managed key 1 and 2, each of which has a control input and first and second switched conclusions, and the first switching output is common to the control circuit and a switched circuit, shunting the two-ports 3 and 4, the outputs of which continuum inputs of each semiconductor managed key, load 6, which via an isolating capacitor 5 is connected between the common circuit switched conclusions of keys, and one or two voltage source 7 and 8, which are connected between the non-common switched by the output of one key and managing the input of another. Any of the sources may be absent and replaced by a direct connection, dial-up output with a control input, which formally corresponds to the source with zero output voltage.

As semiconductor controlled switches can be used transistors, thyristors, and more complex keys, made up of transistors and thyristors using EXT is the possibility of passing a constant current through the load, and in some cases may not be present separately, if the load itself is capacitive in nature, for example, if the load is a piezoelectric element.

The main purpose of the two-port shunt is the same as in the prototype shunting the input to one key, while through the other key current flows. Unlike the prototype that by changing the relationship between schema elements there is no need for additional resistors in the circuit of the control electrode, but with the current public key is created locking the offset for the second key, which leads to a significant reduction of the dynamic losses.

Cascade works as follows.

For example, during the first stage to the input of the key 1 through the quadrupole 3 filed opening pulse, and the input key 2 through the quadrupole 4 antiphase him closing. Current flows from the voltage source 7 via a public key 1, sequentially switched capacitor 5 and the load 6, then through the shunt quadrupole 4 and the current circuit is closed by the voltage source 7. When the current passing through the quadrupole 4 generates a voltage drop, which is also closing for key 2.

When switching to the second beat of the polarity change locking pulse, and at the input of the control semiconductor key 2 through a shunt quadrupole 4 unlocking.

The process of switching cascade. The key 2 will remain closed until such time as the voltage on the input will be closing. And this is the voltage created by the current key 1, passing through the quadrupole 4, will be as long until you exit key 1.

This creates the necessary delay of key 2. After closing of the controlled semiconductor key 1 opens managed semiconductor key 2 in the steady state of the second clock cycle, the current from the voltage source 8 through an open controlled semiconductor key 2 is supplied to the load, then through the condenser 5 and the shunt quadrupole 3 current returns to the voltage source 8. The absence of one of the voltage sources leaves all our reasoning power, everything happens in the same order, only the current in the circuit without source is inspired for the duration of the previous cycles the condenser 5.

At the next change of polarity of the control pulses all described processes are repeated.

Two-stroke key Piletilevi and second switched conclusions moreover, the first switched output is common to the control circuit and a switched circuit, two shunt two-port network with input and output, with the output of each shunt quadrupole connected in parallel to a plot control input of the first switched output of the corresponding semiconductor managed key, and the voltage source, wherein the load enabled through the introduction of decoupling capacitor is switched between the first conclusions of the semiconductor controlled switches, the second switching output of one of the semiconductor controlled switches through the voltage source is connected to the control input of another semiconductor managed key second computerway conclusion which directly or through an additional voltage source is connected to the control input of the first of the two semiconductor controlled switches.

 

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