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The circuit consists of two half-wave peak detectors, functioning in exactly the same way as the peak detector cell in the Greinacher circuit. However, since a voltage doubler, shown in figure 7, requires only one stage of multiplication only one clock signal is required. While C O is disconnected from the charge pump it partially discharges into the load resulting in ripple on the output voltage. Dounleur, but not all, voltage doubler circuits can be viewed as a single stage of a higher order multiplier: Many of these are concerned with reducing the effect of the transistor drain-source voltage.

In effect, this converts the DC to AC before application to the voltage doubler. Fundamentals of Linear Electronics: The effect of the circuit is to shift the DC value of the waveform. The equipment was used to test insulation on high-voltage commercial power lines. This ripple is smaller for higher clock frequencies since the discharge time is shorter, and is also easier to filter.

The ripple is much reduced, nominally zero under open-circuit load conditions, but when current is being drawn depends on the resistance of the load and the value of the doublekr used. Views Read Edit View history.

Friedrich Heilbronner, Internationale Liste von Elektrotechnikernpp. The output is taken from across the two capacitors in series resulting in an output double the supply voltage. There are many variations and improvements to the basic Dickson charge pump. 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 doubluer multiple stages.


A survolteur cathodique” [High-voltage transformer. In other projects Wikimedia Commons. Essentially, the circuit is a diode clamp circuit. Julian—Gregorian uncertainty Good articles.

Alimentation ultra simple pour ampli audio – Astuces Pratiques

Electrical circuits Electric power conversion Analog circuits Electronic design Rectifiers. It is possible to use the simple doublfur 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.

The output is the superposition of the input AC waveform and the steady DC of the capacitor. At the same time Q 2 is turned on allowing C 2 to charge. However, black and white television sets required an e.

Alimentation ultra simple pour ampli audio

The output is taken across the dde individual outputs. The Greinacher circuit is also commonly known as the half-wave voltage doubler. Alternatively, the capacitors can be made smaller for a given ripple specification. As with a bridge circuit, it is impossible to simultaneously ground the input and output of this circuit. The switching elements are simple diodes and they are driven to switch state merely by the alternating voltage of the input.

The Dickson multiplier normally requires that alternate cells are driven from clock pulses of opposite phase.

Greinacher’s voltage doubler appears in Fig. 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. He used chemical electrolytic rectifiers, which are denoted “Z” Zellencells.

Here two capacitors are simultaneously charged to the same voltage in parallel. This approach is especially useful in low-voltage battery-powered applications where integrated circuits require a voltage supply greater than the battery can deliver. The simplest of these circuits are a form of rectifier which take an AC voltage as input and outputs a doubled DC voltage.

Voltage doublers are a variety of voltage multiplier circuit.


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

Voltage doubler

DC-to-DC voltage doublers cannot switch in this way doublur require a driving circuit to control the switching. 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. The charge pump capacitor, C Pis first charged to the input voltage. A Pocket book for Electrical Engineers5th ed.

Delon’s name and dates appear in: However, the drain-source voltage drop of a diode-wired MOSFET when it is in the on state must be at least the gate threshold voltage which might typically be 0. Each of the two peak detector cells operates on opposite half-cycles of the incoming waveform. The supply is then switched off and the capacitors are switched into series.

As an example, an alkaline battery cell has a nominal voltage of 1. For a circuit using discrete components the Schottky diode would be doubleuur better choice of switching element for its extremely low voltage drop in the on state. A voltage doubler is an electronic circuit which charges capacitors from the input voltage and switches these charges in such a way that, in the ideal case, exactly twice the voltage is produced at the output as at its input.

Article includes photograph of machine. The Greinacher voltage doubler is a significant improvement over the Villard circuit for a small cost in additional components. The capacitor is charged on the negative half cycles to the peak AC voltage V pk.