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Cross-coupled switched capacitor circuits come into their own for very low input voltages.
This approach is especially useful in low-voltage battery-powered applications where integrated circuits require a voltage supply greater than the battery can deliver. From Wikipedia, the free encyclopedia.
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. However, integrated circuit designers prefer to use the easily available MOSFET and compensate for its inadequacies with increased circuit complexity. This page was last edited on 9 Novemberat The switching elements are simple diodes and they are driven to switch state merely by the alternating voltage of the input.
Conceptually, perhaps the simplest switched capacitor configuration is that shown schematically in figure 5. The Dickson multiplier is frequently employed in integrated circuits where the supply voltage from a battery for instance is lower than that required by the circuitry.
While C O is disconnected from the charge pump it partially discharges into the load resulting in ripple on the output voltage. Retrieved from ” https: Here two capacitors are simultaneously charged to the same voltage in parallel. The loss is low in this circuit because there are no diode-wired MOSFETs and their associated threshold voltage problems. It is possible to use the simple diode-capacitor circuits described above to double the voltage of a DC source by preceding the voltage doubler with a chopper circuit.
Since their outputs are in series, the output is twice the peak input voltage. However, since a voltage doubler, shown in figure 7, requires only one stage of multiplication only one clock signal is required. The Dickson multiplier normally requires that alternate cells are driven from clock pulses of opposite phase.
The Greinacher voltage doubler is a significant improvement over the Villard circuit for a small cost in additional components. This douhleur is smaller for higher clock frequencies since the discharge time is shorter, and is also easier to filter. This can be very significant if the input voltage is small, such as a low-voltage battery. The charge pump capacitor, C Pis first charged to the input voltage. Essentially, the circuit is a diode clamp circuit.
The peak detector cell has the effect of removing most of the temsion while preserving the peak voltage at the output. Article includes photograph of machine. He used a mechanical rectifier, which was based on a rotating commutator contact tournant. Wireless battery driven equipment such as douboeur, bluetooth devices and the like may require a single-cell battery to continue to supply power when it has discharged to under a volt.
With ideal switching elements the output is an integral multiple of the input two for a doubler but with a single-cell battery as the input source and MOSFET switches the output will be far less than this value since much of the voltage will be dropped across the transistors. Friedrich Heilbronner, Internationale Liste von Elektrotechnikernpp.
Voltage doubler – Wikipedia
The Villard circuitdue to Paul Ulrich Villard[p 1] consists simply of a capacitor and a diode. Views Read Edit View history.
Alternatively, the capacitors can be made smaller for a given ripple specification. See also Delon’s U.
Fundamentals of Linear Electronics: As with a bridge circuit, it is impossible to simultaneously ground the input and output of this circuit. The output is taken across the two individual outputs. In other projects Wikimedia Commons.
In effect, this converts the DC to AC before application to the voltage doubler. The circuit consists of two half-wave peak detectors, functioning in exactly the same way as the peak detector cell in the Greinacher 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 The practical maximum clock frequency in integrated circuits is typically in the hundreds of kilohertz.
The circuit works by following a Villard cell stage with what is in essence a peak detector or envelope detector stage. The Delon circuit uses a bridge topology for voltage doubling; [p 6] consequently it is also called a full-wave voltage doubler. The equipment was used to test insulation on high-voltage commercial power lines. Delon’s name and dates appear in: While it has the great benefit of simplicity, its output has very poor ripple characteristics. On the next half cycle the roles will be reversed: Thus, the output is supplied with 2 V in alternately from each side of the circuit.
It may 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.
Greinacher’s voltage doubler appears in Fig. Many, but not all, voltage doubler circuits can be viewed as a single stage of a higher order multiplier: The output is the superposition of the input AC waveform and the steady DC of the capacitor. Frequently, a clock signal is readily available on board the integrated circuit and little or no additional circuitry is needed to generate it.