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Thus, the output is supplied with 2 V in alternately from each side of the circuit. It is also called a Cockcroft—Walton multiplier after the particle accelerator machine built by John Cockcroft and Ernest Waltonwho independently discovered the circuit in At the same time switch S doublfur closes so this voltage appears at the output.

However, since a voltage doubler, shown in figure 7, requires only one stage of multiplication only one clock signal is required. In effect, this converts the DC to AC before application to the voltage doubler. Greinacher’s voltage doubler appears in Fig. Fundamentals of Linear Electronics: Voltage doublers were used to either double the voltage on an e.

The Delon circuit uses a bridge topology for voltage doubling; [p 6] consequently it is also called a full-wave voltage doubler.

As with a bridge circuit, it is impossible to simultaneously ground the input and output of this circuit. For a circuit using discrete components the Schottky diode would be a better choice of switching element for its extremely low voltage drop in the on state.

The peak-to-peak ripple is an enormous 2 V pk and cannot be smoothed unless the circuit is effectively turned into one of the more sophisticated forms. However, black and white television sets required an e.

Alimentation ultra simple pour ampli audio

It is then switched to charging the output capacitor, C Oin series with the input voltage resulting in C O eventually being charged to twice the input voltage. Another basic concept is the charge pumpa version of which doubleut shown schematically in figure 6.


It tnsion take several cycles before the charge pump succeeds in fully charging C O but after steady state has been reached it is only necessary for C P to pump a small amount of charge equivalent to that being supplied to the load from C O. The simplest of these circuits are a form of rectifier which take an AC voltage as input and outputs tenaion doubled DC voltage.

If the drop across the final smoothing transistor is also taken into account the circuit may not be able to increase the voltage at all without using multiple stages.

Voltage doubler

The switching elements are simple diodes and they are driven to switch state merely by the alternating voltage of the input. The peak detector cell has the effect of removing most of the ripple while preserving the peak voltage at the output. Electrical circuits Electric power conversion Analog circuits Electronic design Rectifiers. This ripple is smaller for higher clock frequencies since the discharge time is shorter, and is also easier to filter. Frequently, a clock signal is readily available on board the integrated circuit and little or no additional circuitry is needed to generate it.

See also Delon’s U. While it has the great benefit of simplicity, its output has very poor ripple characteristics. For this reason the diodes are often replaced by this type of transistor, but wired to function as a diode – an arrangement called a diode-wired MOSFET.

Voltage doublers are a variety of voltage multiplier circuit.

Voltage doubler – Wikipedia

This can be very significant if the input voltage is small, such as a low-voltage battery. Delon’s name and dates appear in: A voltage doubler using ideal switching elements with zero voltage drop will output double this, namely 3.

The output is taken across the two individual outputs. The operation of Delon’s bridge rectifier is also explained with schematic in: Such circuits are known as switched capacitor circuits. The circuit also has the advantage that the ripple frequency is doubled because there are effectively doublrur voltage doublers both supplying the output from out of phase clocks. The circuit works by following a Villard cell stage with what is in essence a peak detector or envelope tnsion stage.


Views Read Edit View history. Many of these are concerned with reducing the effect of the transistor drain-source voltage.

Alimentation ultra simple pour ampli audio – Astuces Pratiques

Wireless battery driven equipment such as pagers, bluetooth devices and the like may require a single-cell battery to continue to supply power when it has discharged to under a volt. The loss is low in this circuit because there are no diode-wired MOSFETs and their associated threshold voltage problems. They frequently also require a switching element that can be controlled directly, such as a transistorrather than relying on the voltage across the switch as in the simple AC-to-DC case.

While C O is disconnected from the charge pump it partially discharges into the load resulting in ripple on the output voltage. Each of the two peak detector cells operates on opposite half-cycles of the incoming waveform.

There are many different switching devices that could be used in such a circuit, but in integrated circuits MOSFET devices are frequently employed.

The practical maximum clock frequency in integrated circuits is typically in the hundreds of kilohertz. As an example, an alkaline battery cell has a nominal voltage of 1. A Pocket book for Electrical Engineers5th ed.