Converter dc-to-dc

 

(57) Abstract:

The invention relates relates to the field of electrical energy conversion, in particular DC-to-DC. Contains four key connected in a bridge circuit, the first diagonal of which is connected to two terminals, and the second diagonal is connected the primary winding of the transformer. Differs in that it introduced additional filter capacitors connected among the conclusions to the two terminals of the primary winding of the transformer is made symmetrical with drainage from the midpoint of which is connected to the second terminals of the capacitors of the filters and the third terminal. Can be used as a device providing both bipolar output voltage from a unipolar input, and changing the output voltage in half (decrease or increase) with respect to the input with high efficiency. 2 Il.

The invention relates to the field of electrical energy conversion, in particular DC-to-DC, and can be used as a device providing both bipolar output voltage from a unipolar input, and changing the output voltage of VDO is using operational amplifiers with a powerful output stage of complementary transistors [1], providing a lower output voltage and the formation of a bipolar voltage of the unipolar voltage source. Such devices due to deep negative feedback have a high degree of symmetry. However, when a single-ended differential load current flows through one of the transistors of the output stage of the regulator, which reduces the efficiency of the device. The efficiency of such a device is particularly low if the load is connected only to one side, for example, between terminals +E and 0.

Increased efficiency have schemes to convert DC to AC with subsequent rectification, in particular [2], the output voltage (high or low depending on need, including symmetric) is provided at the output of the bridge rectifier fed from the winding to the middle point of the transformer voltage Converter.

However, the presence of the windings and diodes in the circuit the output voltage leads to a certain decrease in the efficiency of the device (optional 5 - 10% and even more, not counting the losses in the inverter). In addition, such a device is relatively complicated, which reduces its reliability.

On the e four key connected in a bridge circuit, the first diagonal of which is connected to the two terminals of the power source, and the second diagonal is connected the primary winding of the transformer [3].

However, it has limited application, because it has no output voltage which is equal to half of the supply voltage, such as power operational amplifiers that require bipolar voltage or low impedance load, which requires half the supply voltage. In addition, it may not provide an increase in output voltage.

The objective of the proposed device is the possibility of change (increase or decrease) of the output voltage in half, while improving the efficiency of the device and the formation of the mid-point of the output voltage.

This task is achieved by the fact that the device contains four key connected in a bridge circuit, the first diagonal of which is connected to two terminals, and the second diagonal is connected the primary winding of the transformer, introduced additional filter capacitors connected among the conclusions to the two terminals of the primary winding of the transformer is made symmetrical with diversion from SREN shows the schematic of the proposed device.

Here VT1 - VT4 - semiconductor (e.g., transistor) keys, forming with the transformer T bridge inverter. +E-E - terminals connected to the first diagonal of the bridge inverter. 1-2 - the primary winding of the transformer T, included in the second diagonal of the bridge inverter. The winding has a tap 3 from the middle point, which is connected with the third terminal 0 of the device, having a potential equal to half of the voltage between terminals +E and-E (conventional zero when the supply voltage of the device +E/-E). C1, C2 are filter capacitors connected to some conclusions to terminals +E and-E, the second to the third terminal 0 of the device.

Chain starting devices, not shown, the control circuit device shown conventionally in the form of windings, connected between the bases and emitters of the complementary pairs of transistors, because their implementation does not affect the solution of the problem. The transformer T can be equipped with the necessary number of secondary windings.

The device can operate in step-down mode (division) (Fig. 1) and increasing (multiplying) voltage (Fig. 2).

In the first mode (Fig. 1) the device operates as follows.

If the connection is for example VT1 and VT3. At the output 1 of the primary winding of the transformer T, the voltage is equal to the value +E, and the output 2 is equal to minus E. Since the output 3 is made from the middle of the primary winding, then the voltage across it is equal to half the supply voltage (conditionally zero).

After turning off the key VT1 and VT3 and enable keys VT2 and VT4 on output 2 of the primary winding of the transformer voltage becomes equal to +E, and the output 1 is equal to-E. at the output 3 voltage remains at zero. Capacitors C1 and C2 provide smoothing of the emission AC voltage that occurs when the key switch transistors.

It should be noted that the provision of conditional zero values on output 3 (mid-point) of the primary winding occurs when any of the relative duration of the on and off States of the keys (in the range up to the saturation of the transformer core, which does not require any special measures and is provided automatically), because it is determined only by the accuracy of the winding of the primary winding of the transformer T. This allows the device is extremely simple and therefore reliable scheme.

If the device is used to supply unbalanced on the works as a step-down autotransformer constant voltage transformation ratio of 0.5.

High efficiency of the device is ensured by the low output impedance of the device due to the parallel connection of the output resistance of the halves of the Converter, each consisting of a key and active resistance of the primary Polubotko (as in the autotransformer AC voltage). In addition, in the case of connection to the output device bipolar load between terminals E, 0 and +E is the output impedance creates a loss only to the differential current of the load, since the minimum (total) load current flows, bypassing the Converter.

In the second mode, when the supply voltage is fed to terminal 0 and one of the terminals +E or-E, and the load connected to terminals +E and-E, the device operates as follows.

Let us assume that the supply voltage applied to terminals 0 and - (Fig. 2) and for the first time included the keys VT1 and VT3. In this case, the supply voltage is connected to one bus terminal 0 to the midpoint 3 of the primary winding of the transformer T, and the second bus - terminal-E and the public key VT3 connects to pin 2 of the primary winding of the transformer T. in the second Polubotko transformer (on pin 1 of the winding relative to output 3) induced voltage equal to the voltage on the first floor is applied at a specified key VT1, it is through him charging the capacitor C1 to a voltage equal to the supply voltage. After turning off the key VT1 and VT3 and enable keys VT2 and VT4 process is repeated. In this case, the capacitor C1 voltage is always equal to the supply voltage. If the load connected to terminals +E and-E, the voltage across it is equal to double the value of the input voltage, i.e., the device operates as a step-up autotransformer with a conversion ratio of 2. The output device may be connected and balanced load.

Thus, the proposed device has the expansion functionality: has the ability to lower or raise the output voltage compared to the input, and in both cases to provide a bipolar voltage output. The efficiency of the device as high as possible for this type of converters, because the device has no extra element (winding or diode, as in the analogue of [2]), through which flowed the load current and the parameters of which would depend the efficiency of the device.

The decision device tasks confirmed the layout.

Offer can be used on the products of the company.

use. - M.: Energoizdat, 1982, S. 44, Fig. 30, b.

2. The circuitry of devices on a powerful field-effect transistors. The Handbook. / Ed. by B. N. Dianova. - M.: Radio and communication, 1994, S. 91, Fig. 4.18.

3. Ibid, S. 184, Fig. 8.14, b.

Converter DC-to-DC containing four key connected in a bridge circuit, diagonal DC which is connected to the first and second terminals, to the diagonal AC of the bridge circuit connected to the primary winding of the transformer, wherein the two capacitor connected to the first pins respectively to the first and second terminals of the primary winding of the transformer is made symmetrical with drainage from the middle point connected to the second terminals of the capacitors and to the third terminal, and one of the three terminals is designed to connect one of the terminals of the voltage source, the other terminal is for connecting one of the conclusions of the load, and the remaining terminal is for connecting the other terminals of the voltage source and the load.

 

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