Name: how a voltage doubler raises ac output
Uploaded: 2025-05-22T09:06:19.000Z
Duration: 1 min 23 s
Channel: JoVE

クランプ部と整流器部の2つの連続したセクションで構成される電圧ダブラー回路を考えてみましょう。
クランプ部はコンデンサC1とダイオードD1で構成され、整流器部はダイオードD2とコンデンサC2で構成されています。
特定の振幅の正弦波入力がクランプ部に印加されると、理想的なダイオードの動作を想定して、ダイオードの両端に出力電圧波形が生成されます。
正のピークをゼロボルトに固定すると同時に、負のピークが正弦波入力の振幅の2倍の値に達するようにします。
クランプ部全体の出力波形は、整流器部への入力として機能します。
コンデンサC2の両端にDC電圧を生成しますが、これは正弦波入力の振幅の2倍に等しくなります。
出力電圧が入力電圧のピーク値の2倍であるため、この回路は電圧ダブラーとして知られています。
この手法は、入力正弦波の振幅の倍数が大きい出力電圧を生成するように拡張できます。
電圧ダブラーは、科学機器、信号処理、電子機器のDC/DCコンバータなど、さまざまなアプリケーションで使用されています。

電圧倍増回路

Voltage Doubler Circuit

電圧倍増回路は、クランプ セクションと整流セクションという 2 つの主要コンポーネントを統合します。クランプ セクションはコンデンサ (C_1) とダイオード (D_1) で構成され、整流セクションには別のダイオード (D_2) とコンデンサ (C_2) が装備されています。この回路は、正弦波入力電圧の 2 倍の振幅を持つ出力電圧を生成します。

<img alt="Figure 1" src="/files/ftp_upload/15724/15724_Figure_1v2.svg" style="height: 132px;">

クランプ セクションに正弦波入力が導入されると、回路が動作を開始します。理想的な条件下では、このセクションはダイオード D_1 の両端に電圧波形を出力し、正のピークを 0 ボルトで効果的にクランプし、負のピークが正弦波入力の振幅の 2 倍の大きさになるようにします。クランプ セクションからのこの変換された波形は、整流セクションに送られます。ここで、注目すべき変換が発生し、コンデンサ C_2 の両端に DC 電圧が生成されます。この電圧は、最初の正弦波入力の振幅の 2 倍を反映し、回路の名前の由来であり、主な機能を示す倍増効果をもたらします。

電圧倍増器の原理は倍増に限定されるだけでなく、入力電圧をより高い係数で乗算するように適応させることもできるため、その適用範囲が広がります。電圧倍増器はさまざまな分野で極めて重要であり、科学機器で使用され、信号処理技術を強化し、多数の電子機器内の DC-DC コンバーターの重要なコンポーネントとして機能します。電圧を効率的に倍増するこの機能により、電圧倍増器回路は電子設計とアプリケーションの基礎となります。

クランプ部と整流器部の2つの連続したセクションで構成される電圧ダブラー回路を考えてみましょう。
クランプ部は...

Education

JoVE Core

Electrical Engineering

電気工学

Unit 1

ユニット1

Diodes

ダイオード

KEY TERMS AND CONCEPTS

主要用語と概念

how a voltage doubler raises ac output

A voltage doubler circuit raises the output voltage by using a clamping section and a rectifier section. The clamping section includes a capacitor, C1, and a diode, D1. The rectifier section includes a second diode, D2, and a capacitor, C2.

The circuit starts working when a sinusoidal input signal enters the clamping section. Under ideal conditions, this stage clamps the positive peaks at zero volts. It also lets the negative peak reach a magnitude that is twice the input amplitude.

That shaped waveform then moves into the rectifier section. There, the circuit produces a DC voltage across capacitor C2. This output equals twice the amplitude of the original sinusoidal input, which gives the circuit its voltage-doubling effect.

The same principle can also be extended to multiply the input voltage by higher factors. Because of this, voltage doublers are useful in scientific instruments, signal processing, and DC-DC converters found in many electronic devices. This makes the circuit an important part of electronic design and application.

How a Voltage Doubler Raises AC Output

the ideal diode

Ideal Diode I-V Curve and Rectification

An ideal diode is a simple model of a semiconductor diode used to show how current moves through circuits. A diode has two terminals. The anode is positive, and the cathode is negative. In this model, current can flow only in one direction. When a positive voltage is applied to the anode relative to the cathode, the diode is forward-biased. In that state, it conducts current. When the cathode is at a higher potential than the anode, the diode is reverse-biased. It then blocks current and acts...

diode: forward bias

Diode Current in Forward Bias

Diode current in forward bias depends on how the p-type and n-type regions are connected to a battery. When the p-type region is tied to the positive terminal and the n-type region to the negative terminal, the diode is forward-biased. This setup lowers the potential barrier inside the diode and lets current move easily from the p-type side to the n-type side. The current-voltage behavior of a forward-biased diode is described by its I-V characteristics. These characteristics depend on the...

diode: reverse bias

Diode Reverse Current and Breakdown

A diode in reverse bias blocks current flow and widens its depletion region. In this setup, the positive terminal of the power source connects to the n-type material, and the negative terminal connects to the p-type material. The reverse connection also raises the barrier potential, so current stays very small. The small reverse current is called leakage current. It comes mainly from minority charge carriers. At room temperature, once the reverse voltage is above the thermal voltage, the...

zener diodes

Zener Diode Voltage Regulation

Zener diodes are semiconductor devices used to hold voltage steady in reverse bias. In reverse breakdown, current flows into the cathode and makes it positive relative to the anode. This behavior is different from a conventional diode and is the reason Zener diodes are useful in voltage regulation. A Zener diode has a nearly vertical current-voltage, or I-V, curve above a threshold called the knee current. That shape lets it keep a fairly stable voltage over a wide range of currents.

modeling of diode forward characteristics

modeling-of-diode-forward-characteristics

Diode Forward Bias: I-V Curve and Models

Diode forward bias is analyzed with the current-voltage, or I-V, curve and two common circuit models. These models help describe how a diode behaves when current flows in the forward direction. They are useful for electronic circuit design and analysis. The exponential diode model is used when the source voltage rises above 0.5 volts. At that point, the diode current increases exponentially above the saturation current. The I-V curve shows this nonlinear response as the forward voltage...

small-signal diode model

Diode Bias and Small-Signal Response

Diode bias and small-signal response describe how a diode behaves when a steady DC voltage and a tiny changing signal act on the same circuit. The DC bias sets the diode’s operating point, or Q point. Around that point, the diode current and voltage follow an exponential I-V relationship. A small time-varying signal can be added on top of the DC bias to study how the diode responds to small changes. When the signal voltage is much smaller than the thermal voltage, the diode’s behavior can be...

modeling of diode reverse characteristics

modeling-of-diode-reverse-characteristics

Zener Diode Load-Line Modeling

Zener diode load-line modeling shows how a reverse-biased diode sets a steady voltage in a circuit. Zener diodes use reverse breakdown in a controlled way, so they can hold a fixed voltage across their terminals. This makes them useful for voltage regulation. When the reverse voltage rises above the Zener voltage, or VZ, the diode enters the breakdown region. In this region, the current-voltage, or I-V, curve becomes nearly vertical after the knee current, IZ, is reached. That means the...

half wave rectifier

Single-Diode AC to DC Conversion

Single-diode AC to DC conversion uses a half-wave rectifier to change alternating current into a unidirectional voltage. The circuit is simple. It uses one diode in series with a load resistor and an AC power source. The diode controls the current because it allows flow in only one direction. During the positive half-cycles of the AC input, the diode is forward-biased. When the input voltage is greater than the diode threshold, current flows and an output voltage appears across the load...

full wave rectifier

AC to DC Conversion with Full-Wave Rectifiers

A full-wave rectifier converts alternating current, or AC, into direct current, or DC. It is more efficient than a half-wave rectifier. The circuit usually uses a center-tapped transformer, two diodes, and a load resistor. The center-tapped transformer is the key part of the circuit. Its secondary winding is split into two equal voltages with opposite polarities. That split lets the rectifier use both halves of the AC input waveform. During the positive half-cycle of the AC signal, diode D1...

bridge rectifier

AC to DC Conversion with Bridge Diodes

A bridge rectifier converts alternating current (AC) into direct current (DC) using four diodes arranged in a bridge layout. It is used to turn both halves of the AC waveform into a single-direction output. That makes it an important part of many electronics circuits. During the positive half-cycle, diodes D1 and D2 conduct. Current then flows through the load resistor R. At the same time, D3 and D4 are reverse-biased, so they do not conduct. The action switches during the negative half-cycle.

clipper circuit

Dual Diode Wave Clipping

Dual diode wave clipping uses diodes and biasing batteries to reshape an AC signal. A clipper circuit is a wave-shaping device that changes waveform parts without changing the whole signal. It is commonly used in television and radar communication systems to improve waveform modulation in transmitters and receivers. A dual-clipper setup uses two ideal diodes, two biasing batteries, and a resistor connected in parallel. The circuit works by responding to the phase of the input AC signal. The...

clamper circuit

DC Restorer for Waveform Level Shifting

A clamper circuit, or DC restorer, shifts a waveform up or down by adding a DC level. It is a special form of rectifier circuit. In this setup, the output is taken across the diode instead of across the capacitor. The circuit works well with square wave inputs and other pulse signals. The diode direction lets the capacitor charge to the most negative peak of the input signal. After that, the diode stops conducting. The capacitor then holds that voltage at a steady value. As a result, the...

voltage doubler circuit

A voltage doubler circuit raises the output voltage by using a clamping section and a rectifier section. The clamping section includes a capacitor, C1, and a diode, D1. The rectifier section includes a second diode, D2, and a capacitor, C2. The circuit starts working when a sinusoidal input signal enters the clamping section. Under ideal conditions, this stage clamps the positive peaks at zero volts. It also lets the negative peak reach a magnitude that is twice the input amplitude. That...

schottky barrier diode

Fast Switching in Schottky Diodes

Schottky barrier diodes use a metal-semiconductor junction to control current flow. They are built by combining a metal layer with a moderately doped n-type semiconductor. This contact creates the Schottky barrier, which gives the diode its one-way current behavior. When the metal touches the semiconductor, charge transfer occurs. The Fermi levels of the two materials align, and a depletion region forms near the contact area. In an n-type semiconductor, this region contains uncompensated...

key terms and concepts

Learn how a clamping section and rectifier section work together in a voltage doubler circuit to produce a DC output with twice the input amplitude.

How a Voltage Doubler Raises AC Output | JoVE K12

JoVE Core 電気工学 は、電気回路の基本概念と回路解析テクニックを網羅したアニメーションビデオシリーズです。オペアンプと回路変換および 1 次・ 2 次回路の概念を網羅しています。実験を撮影した実写動画では、設計例や現代社会での応用が含まれており、複雑な概念も分かりやすく学習いただけます。

electrical engineering

How a Voltage Doubler Raises AC Output

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