CN203574557U - Low-ripple DC voltage-doubler rectifier - Google Patents

Abstract

The utility model belongs to a DC voltage-doubler rectifier, and specifically relates to a low-ripple DC voltage-doubler rectifier which is suitable for the occasion that is required for relatively high output voltage, low ripple and low voltage sag. Y connection is used for input windings of a three-phase group-type transformer, and three-phase output windings are independently connected for output. In connection of each phase output winding, due to the fact that the phase difference of two double-voltage circuits connected with the winding is 180 degrees, ripple is decreased after the double-voltage circuits are serially connected and superposed; and then four-times-voltage circuits connected with three-phase outputs are serially connected, and the ripple is further decreased after superposition. The low-ripple DC voltage-doubler rectifier is advantageous in that high voltage output is obtained by utilization of a double-voltage circuit input-parallel output-serial mode; the ripple is offset through phase-shifted superposition; and the relatively high voltage output is obtained by low-level double-voltage circuits and provided with low ripple and voltage sag.

Description

A kind of low ripple direct current voltage-doubler rectifier

Technical field

The invention belongs to a kind of direct current voltage-doubler rectifier, be specifically related to a kind of output voltage that is suitable for compared with high and require the occasion of low ripple and Low Dropout.

Background technology

At present, the general employing of cockcroft-walton voltage multiplier device voltage multiplying rectifier similar to Figure 1, Fig. 1 is 6 voltage doubling rectifing circuits.If not bringing onto load, during stable state, except leftmost that electric capacity, the voltage on other each electric capacity is 2U, and total output voltage is 6U.High-order voltage doubling rectifing circuit load capacity is very poor, exports very little power and will cause significantly falling of output voltage.Suppose that output current is I, the capacity of each electric capacity is all C mutually, and ac power frequency is f, voltage fall for:

$\mathrm{\ΔU}=\frac{I}{6\mathrm{fC}}({4N}^3+{3N}^2+2N)$

Voltage ripple is:

$\frac{(N+1)N}{4}\frac{I}{\mathrm{fC}}$

Can see and adopt this circuit, the progression of multiplication of voltage is higher, and ripple and voltage fall also larger, main relevant with 2 powers or 3 powers of progression.Therefore will make ripple and voltage fall little, should adopt as far as possible few progression, but progression be few, in the situation that input voltage is certain, output voltage is low.Adopt in addition in addition the circuit of Fig. 2 to reduce ripple, although ripple has obtained reducing, the progression of circuit is still very high, and therefore circuit still exists ripple high, and voltage falls large problem.

Summary of the invention

The object of this invention is to provide a kind of low ripple direct current voltage-doubler rectifier, ripple and voltage that this voltage-multiplying circuit can not only reduce voltage-multiplying circuit fall, and because the progression of voltage is lower, more easily reduce the ripple of circuit.

The present invention is achieved in that a kind of low ripple direct current voltage-doubler rectifier, and three-phase group formula transformer input winding adopts Y connection, the output of output winding three-phase separate connection, A phase winding Same Name of Ends and capacitor C ₁and capacitor C ₃be connected, capacitor C ₁again with rectifier diode D ₁negative pole, rectifier diode D ₂anodal being connected, rectifier diode D ₂negative pole and capacitor C ₂one end is connected; Capacitor C ₃again with rectifier diode D ₃anodal, rectifier diode D ₄negative pole is connected, rectifier diode D ₄positive pole and capacitor C ₄one end is connected, and rectifier diode D ₁anodal, rectifier diode D ₃negative pole, capacitor C ₂and capacitor C ₄the other end A phase winding non-same polarity that is linked back; B phase winding non-same polarity and capacitor C ₅and capacitor C ₇be connected, capacitor C ₅again with rectifier diode D ₅negative pole, rectifier diode D ₆anodal being connected, rectifier diode D ₆negative pole and capacitor C ₆one end is connected; Capacitor C ₇again with rectifier diode D ₇anodal, rectifier diode D ₈negative pole is connected, rectifier diode D ₈positive pole and capacitor C ₈one end is connected, and rectifier diode D ₅anodal, rectifier diode D ₇negative pole, capacitor C ₆and capacitor C ₈the other end B phase winding Same Name of Ends that is linked back; C phase winding non-same polarity and capacitor C ₉and capacitor C ₁₁be connected, C ₉again with rectifier diode D ₉negative pole, rectifier diode D ₁₀anodal being connected, rectifier diode D ₁₀negative pole and C ₁₀one end is connected; C ₁₁again with rectifier diode D ₁₁anodal, rectifier diode D ₁₂negative pole is connected, rectifier diode D ₁₂positive pole and capacitor C ₁₂one end is connected, and rectifier diode D ₉anodal, rectifier diode D ₁₁negative pole, capacitor C ₁₀and capacitor C ₁₂the other end C phase winding Same Name of Ends that is linked back.

Advantage of the present invention is, adopts two voltage-multiplying circuits inputs in parallel, and the mode of output series connection obtains high voltage output.By phase shift, superpose simultaneously, ripple is offset.With the voltage-multiplying circuit of harmonic series, obtained high voltage output, there is low ripple and voltage simultaneously and fall.

Accompanying drawing explanation

Fig. 1 is the multistage voltage-multiplying circuit figure of typical case with the most use;

Fig. 2 is the multistage voltage-multiplying circuit of typical case's output in parallel;

Fig. 3 is a kind of direct current voltage-doubler rectifier schematic diagram provided by the present invention.

Embodiment

Below in conjunction with accompanying drawing and example, the present invention is described in detail:

As shown in Figure 3, T _a-T _b-T _cfor three-phase group formula transformer, D ₁-D ₁₂for rectifier diode, C ₁-C ₁₂for electric capacity, C ₁₃-C ₁₆for filter capacitor.

In the drawings, three-phase group formula transformer input winding adopts Y connection, the output of output winding three-phase separate connection.A phase winding Same Name of Ends and C ₁and C ₃be connected, C ₁again with D ₁negative pole, D ₂anodal being connected, D ₂negative pole and C ₂one end is connected; C ₃again with D ₃anodal, D ₄negative pole is connected, D ₄positive pole and C ₄one end is connected.And D ₁anodal, D ₃negative pole, C ₂and C ₄the other end A phase winding non-same polarity that is linked back.

In the drawings, B phase winding non-same polarity and C ₅and C ₇be connected, C ₅again with D ₅negative pole, D ₆anodal being connected, D ₆negative pole and C ₆one end is connected; C ₇again with D ₇anodal, D ₈negative pole is connected, D ₈positive pole and C ₈one end is connected.And D ₅anodal, D ₇negative pole, C ₆and C ₈the other end B phase winding Same Name of Ends that is linked back.

In the drawings, C phase winding non-same polarity and C ₉and C ₁₁be connected, C ₉again with D ₉negative pole, D ₁₀anodal being connected, D ₁₀negative pole and C ₁₀one end is connected; C ₁₁again with D ₁₁anodal, D ₁₂negative pole is connected, D ₁₂positive pole and C ₁₂one end is connected.And D ₉anodal, D ₁₁negative pole, C ₁₀and C ₁₂the other end C phase winding Same Name of Ends that is linked back.

In every connection of exporting mutually winding, because two two voltage-multiplying circuit phase differences 180 that winding connects are spent, therefore, after voltage-multiplying circuit overlapped in series, ripple reduces.Again three-phase is exported to four voltage-multiplying circuits that connect afterwards and connect, after stack, ripple further reduces.

Claims (1)

1. a low ripple direct current voltage-doubler rectifier, is characterized in that: three-phase group formula transformer input winding adopts Y connection, the output of output winding three-phase separate connection, A phase winding Same Name of Ends and capacitor C ₁and capacitor C ₃be connected, capacitor C ₁again with rectifier diode D ₁negative pole, rectifier diode D ₂anodal being connected, rectifier diode D ₂negative pole and capacitor C ₂one end is connected; Capacitor C ₃again with rectifier diode D ₃anodal, rectifier diode D ₄negative pole is connected, rectifier diode D ₄positive pole and capacitor C ₄one end is connected, and rectifier diode D ₁anodal, rectifier diode D ₃negative pole, capacitor C ₂and capacitor C ₄the other end A phase winding non-same polarity that is linked back; B phase winding non-same polarity and capacitor C ₅and capacitor C ₇be connected, capacitor C ₅again with rectifier diode D ₅negative pole, rectifier diode D ₆anodal being connected, rectifier diode D ₆negative pole and capacitor C ₆one end is connected; Capacitor C ₇again with rectifier diode D ₇anodal, rectifier diode D ₈negative pole is connected, rectifier diode D ₈positive pole and capacitor C ₈one end is connected, and rectifier diode D ₅anodal, rectifier diode D ₇negative pole, capacitor C ₆and capacitor C ₈the other end B phase winding Same Name of Ends that is linked back; C phase winding non-same polarity and capacitor C ₉and capacitor C ₁₁be connected, C ₉again with rectifier diode D ₉negative pole, rectifier diode D ₁₀anodal being connected, rectifier diode D ₁₀negative pole and C ₁₀one end is connected; C ₁₁again with rectifier diode D ₁₁anodal, rectifier diode D ₁₂negative pole is connected, rectifier diode D ₁₂positive pole and capacitor C ₁₂one end is connected, and rectifier diode D ₉anodal, rectifier diode D ₁₁negative pole, capacitor C ₁₀and capacitor C ₁₂the other end C phase winding Same Name of Ends that is linked back.

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