CN100568696C - Voltage doubling rectifing circuit - Google Patents
Voltage doubling rectifing circuit Download PDFInfo
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- CN100568696C CN100568696C CNB2007101180618A CN200710118061A CN100568696C CN 100568696 C CN100568696 C CN 100568696C CN B2007101180618 A CNB2007101180618 A CN B2007101180618A CN 200710118061 A CN200710118061 A CN 200710118061A CN 100568696 C CN100568696 C CN 100568696C
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Abstract
The invention discloses a kind of voltage doubling rectifing circuit, comprise transformer, C-W voltage-multiplying circuit and pwm control circuit.Primary different name termination power input V
In, primary end of the same name links to each other with the drain electrode of switching tube Q1; The output of pwm control circuit links to each other with the grid of switching tube Q1, and the source electrode of switching tube Q1 links to each other with ground; Transformer secondary output links to each other with the C-W voltage-multiplying circuit.The present invention a kind ofly does PWM control with single-ended reverse exciting, and subsidiary normal shock voltage output can swash voltage and normal shock voltage stack up repeatedly by charge pump anti-secondary, realizes the switching power circuit of high pressure output.In the normal shock loop, increased energy storage inductor, in the high die pressing product of middle low power, used this circuit and can effectively reduce the transformer number of turn, improve device withstand voltage and select for use, can form thus optimize close on loss and switching loss with raise the efficiency, and part improve the effect of EMI characteristic.
Description
Technical field
The present invention relates to a kind of power circuit, specifically, relate to the power circuit of a kind of multiplication of voltage and rectification.
Background technology
At present,, proposed by COCCROFT and WALTON, be commonly referred to the C-W voltage doubling rectifing circuit in 1932 based on the high-voltage rectifier circuit of charge pump.A kind of common topology as shown in Figure 1, wherein secondary rectifying tube and charge pump electric capacity can make output voltage folded more high more according to the adding up repeatedly of mode among the figure.If all diode reverse, output voltage polarity can be opposite.Usually per 2 times are called single order, and above-mentioned 4 voltage doubling rectifing circuits are 2 rank.
Bear timing down when transformer secondary output is output as, current direction as shown in Figure 2.Transformer secondary output is to two electric capacity chargings of upper arm.
When bearing just down in the transformer secondary output output, current direction such as Fig. 3.Upper arm electric capacity and transformer are to two electric capacity chargings of underarm.If bringing onto load not, during stable state, the voltage on the capacitor C 1 is U, capacitor C 2, C3 and C4, on voltage be 2U, total output voltage is 4U, so can select withstand voltage lower electric capacity for use.But because electric capacity is discharged in series, so ripple is bigger.Suppose that output current is I, the capacity of each electric capacity is identical, is C, and ac power frequency is f, and then the output voltage ripple of N rank voltage-multiplying circuit is:
Circuit can improve as shown in Figure 4.Transformer secondary output has two windings, is made up of the C-W circuit of two symmetries, and the ripple current that two-way is relative is cancelled each other, and output ripple can be little a lot, and capacitance voltage stress is no more than 2U equally.
But foregoing circuit is that offset of sinusoidal waveform alternating current carries out the multiplication of voltage operation originally, and the input voltage height directly influences output voltage, does not have the leeway of control.
Summary of the invention
A kind of voltage doubling rectifing circuit that the present invention designs in order to solve the problems of the technologies described above just.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of voltage doubling rectifing circuit comprises transformer, C-W voltage-multiplying circuit and pwm control circuit.Primary different name termination power input V
In, primary end of the same name links to each other with the drain electrode of switching tube Q1; The output of pwm control circuit links to each other with the grid of switching tube Q1, and the source electrode of switching tube Q1 links to each other with ground; Transformer secondary output links to each other with the C-W voltage-multiplying circuit, and the C-W voltage-multiplying circuit is multistage voltage-multiplying circuit.
Described C-W voltage-multiplying circuit can be any multistage voltage-multiplying circuit.
Preferably, C-W voltage-multiplying circuit in the described voltage doubling rectifing circuit is the second order voltage-multiplying circuit, it comprises capacitor C 1, C2, C3 and C4, diode D1, D2, D3 and D4, wherein capacitor C 1 pin links to each other with diode D1 negative pole and diode D2 positive pole, diode D1 plus earth, capacitor C 2 is serially connected between diode D1 positive pole and the diode D2 negative pole, diode D2 negative pole links to each other with diode D3 is anodal, capacitor C 3 is serially connected between diode D2 positive pole and the diode D3 negative pole, diode D3 negative pole links to each other with diode D4 is anodal, and capacitor C 4 is serially connected between the negative pole of diode D3 positive pole and diode D4, and diode D4 negative pole is power output end V
o
C-W voltage-multiplying circuit in the described voltage doubling rectifing circuit comprises capacitor C 1, C2, C3 and C4, diode D1, D2, D3 and D4, and energy storage inductor L1 and L2 have been increased, wherein energy storage inductor L1 is serially connected between capacitor C 1 and the diode D1 negative pole, and energy storage inductor L2 is serially connected between capacitor C 3 and the diode D3 negative pole.
T1 level of transformer in the described voltage doubling rectifing circuit is double winding, wherein second winding end of the same name links to each other with the first winding different name end, diode D5 positive pole links to each other with diode D1 is anodal, capacitor C 5 is serially connected between the diode D5 negative pole and the second winding different name end, diode D5 negative pole links to each other with diode D6 is anodal, energy storage inductor L3 is serially connected between capacitor C 2 and the diode D6 negative pole, diode D7 positive pole links to each other with diode D3 is anodal, capacitor C 6 is serially connected between diode D6 positive pole and the diode D7 negative pole, energy storage inductor L4 is serially connected between capacitor C 4 and the diode D8 negative pole, and diode D8 positive pole links to each other with diode D7 negative pole.
On Switching Power Supply, realize voltage doubling rectifing circuit, then need to add PWM control.For the middle low power product, elementary employing single-end circuit is both economical.In voltage-multiplying circuit, secondary positive and negative two kinds of polarity are all at the output energy; And be by the secondary voltage stack of the transfer process realization of polarity.If so, then be different from conventional normal shock or instead swash, but in positive and negative two parts a kind of topology of output voltage and two voltage stacks all the elementary single-ended switch pulsating direct current that changes PWM control into of sort circuit.Wherein normal shock part output voltage is directly influenced by input voltage and transformer voltage ratio, and is uncontrollable, has only the anti-voltage that swashs part influenced by duty ratio, may command.Therefore, a kind of feasible topology is elementary single-end circuit, and secondary positive and negative output is the circuit of PWM control instead to swash.
Directly elementary change single-ended pwm control circuit into after topology as shown in Figure 5, suppose that transformer voltage ratio is K, duty ratio is D, transformer should suitably leave air gap with storage power.The similar C-W circuit of this circuit secondary work mode, the voltage that is secondary positive and negative two kinds of polarity is unequal.During the primary switch conducting, bear positive status down according to secondary being in of end of the same name, primary energy is given capacitor C 1, C3 charging by transformer.The last voltage of this moment C1, C3 is transformer-secondary voltage Vin/K.When elementary switch turn-offs, voltage is VinD/K (1-D) on the secondary winding, and energy stored outwards discharges in the transformer, and the last voltage of C2, C4 is that the last original voltage of C1, C3 is superimposed with winding voltage, equal Vin/K (1-D), this also is the single order output voltage of sort circuit.For N rank multiplication of voltage, finally export Vo=NVin/K (1-D).
But,, very big defective is arranged though such circuit can be realized multiplication of voltage.In the time of elementary shutoff, C1, C3 also provide electric current to output loading simultaneously to C2, C4 charging, and capacitor discharge must cause voltage to descend.When opening once more, secondary normal shock voltage Vin/K fixes when elementary, and C1, C3 voltage this moment is lower than this value, secondaryly when charging again must form great charging current spike to C1 and C2 to C3.A series of problems such as the electric stress that brings thus impacts, EMI disturbs, transformer loss is big.For this reason, add energy storage inductor can for the normal shock arm, suppress current break.
As shown in the figure 6, negative on the transformer secondary output in the half period down just winding is given C1, C3 charging by L1, L2 at normal shock, and the pressure reduction in the charging process on the inductance has remedied the pressure reduction between secondary winding and electric capacity, makes charging current not have spike, simultaneously inductive energy storage.Negative just down on transformer secondary output in the anti-sharp half period, normally realize multiplication of voltage, L1, L2 discharge by D2, D4 afterflow simultaneously, and the voltage on the afterflow interdischarge interval inductance is equivalent to the output voltage of single order.This moment output voltage V o=N[Vin/K (1-D)-VL], VL wherein is the voltage on L1, the L2 in the normal shock process, this magnitude of voltage is influenced by the output loading size and changes, the heavy more voltage of load is big more, need more big space rate for guaranteeing output voltage this moment.Suppose that capacitance is very big and ignore voltage fluctuation on the electric capacity in the cycle, L1, L2 have deposited abundant energy under the then extreme case, to such an extent as to the electricity of inductance L 1, L2 has not all been put in the whole anti-flyback cycle, then according to weber balance can derive VL=Vin/K, do not have voltage on the C1 this moment, and C2=C3=C4=VinD/K (1-D), final output voltage V o=NVinD/K (1-D) is equivalent to only anti-sharp voltage be stacked up; But the power topology was different from and instead swashed this moment, because there have considerable part output energy to be delivered in the time of elementary conducting to be secondary, comprised direct output or existed in the secondary inductance, exported when afterflow.So transformer needs energy stored to swash less than anti-, can realize less ripple current during design, helps improving EMI.
This circuit can be realized the output ripple voltage counteracting with double winding equally, as shown in Figure 7.Through actual measurement, do the product that a small-sized 15W power 400V exports with two voltage-multiplying circuits, efficient has compared conventional anti-sharp scheme height 5 percentage points nearly, and the transformer difficulty of processing alleviates significantly, and Ripple Noise also has improvement.
The invention has the beneficial effects as follows that this voltage doubling rectifing circuit is a kind ofly to do PWM control with single-ended reverse exciting, subsidiary normal shock voltage output can swash voltage and normal shock voltage stack up repeatedly by charge pump anti-secondary, realizes the switching power circuit of high pressure output.In the normal shock loop, added energy storage inductor, make circuit topography and respective performances and common C-W voltage-multiplying circuit that the essence difference be arranged.In the high die pressing product of middle low power, use this circuit and can effectively reduce the transformer number of turn, improve device withstand voltage and select for use, can form thus optimize close on loss and switching loss with raise the efficiency, and part improve the effect of EMI characteristic.
Description of drawings
Fig. 1 is common C-W voltage doubling rectifing circuit schematic diagram.
Fig. 2 is for being output as negative timing down, common C-W voltage doubling rectifing circuit current direction schematic diagram when transformer secondary output.
Fig. 3 when when transformer secondary output is output as on, bearing just down, common C-W voltage doubling rectifing circuit current direction schematic diagram.
Fig. 4 common C-W voltage doubling rectifing circuit schematic diagram when two windings being arranged for transformer secondary output.
Fig. 5 is a voltage doubling rectifing circuit schematic diagram of the present invention.
Fig. 6 has increased the voltage doubling rectifing circuit schematic diagram of energy storage inductor for the present invention.
Fig. 7 has two windings for transformer secondary output of the present invention and has increased the voltage doubling rectifing circuit schematic diagram of energy storage inductor.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 5, a kind of voltage doubling rectifing circuit of the present invention comprises transformer, C-W voltage-multiplying circuit and pwm control circuit.Primary different name termination power input V
In, primary end of the same name links to each other with the drain electrode of switching tube Q1; The output of pwm control circuit links to each other with the grid of switching tube Q1, and the source electrode of switching tube Q1 links to each other with ground; Transformer secondary output links to each other with C-W second order voltage-multiplying circuit.C-W voltage-multiplying circuit in the described second order voltage doubling rectifing circuit comprises capacitor C 1, C2, C3 and C4, diode D1, D2, D3 and D4, wherein capacitor C 1 pin links to each other with diode D1 negative pole and diode D2 positive pole, diode D1 plus earth, capacitor C 2 is serially connected between diode D1 positive pole and the diode D2 negative pole, diode D2 negative pole links to each other with diode D3 is anodal, capacitor C 3 is serially connected between diode D2 positive pole and the diode D3 negative pole, diode D3 negative pole links to each other with diode D4 is anodal, capacitor C 4 is serially connected between the negative pole of diode D3 positive pole and diode D4, and diode D4 negative pole is power output end V
o
As shown in Figure 6, C-W voltage-multiplying circuit in the described voltage doubling rectifing circuit comprises capacitor C 1, C2, C3 and C4, diode D1, D2, D3 and D4, and energy storage inductor L1 and L2 have been increased, wherein energy storage inductor L1 is serially connected between capacitor C 1 and the diode D1 negative pole, and energy storage inductor L2 is serially connected between capacitor C 3 and the diode D3 negative pole.
As shown in Figure 7, T1 level of transformer in the described voltage doubling rectifing circuit is double winding, wherein second winding end of the same name links to each other with the first winding different name end, diode D5 positive pole links to each other with diode D1 is anodal, capacitor C 5 is serially connected between the diode D5 negative pole and the second winding different name end, diode D5 negative pole links to each other with diode D6 is anodal, energy storage inductor L3 is serially connected between capacitor C 2 and the diode D6 negative pole, diode D7 positive pole links to each other with diode D3 is anodal, capacitor C 6 is serially connected between diode D6 positive pole and the diode D7 negative pole, energy storage inductor L4 is serially connected between capacitor C 4 and the diode D8 negative pole, and diode D8 positive pole links to each other with diode D7 negative pole.
The present invention is not limited to above-mentioned preferred forms, and other any identical with the present invention or akin circuit that anyone draws under enlightenment of the present invention all drop within protection scope of the present invention.
Claims (2)
1, a kind of voltage doubling rectifing circuit comprises transformer, C-W voltage-multiplying circuit and pwm control circuit; It is characterized in that: primary different name termination power input V
In, primary end of the same name links to each other with the drain electrode of switching tube Q1; The output of pwm control circuit links to each other with the grid of switching tube Q1, and the source electrode of switching tube Q1 links to each other with ground; Transformer secondary output links to each other with the C-W voltage-multiplying circuit, and the C-W voltage-multiplying circuit is the second order voltage-multiplying circuit;
Described C-W voltage-multiplying circuit comprises for the second order voltage-multiplying circuit: capacitor C 1, capacitor C 2, capacitor C 3 and capacitor C 4, diode D1, diode D2, diode D3 and diode D4 and inductance L 1, inductance L 2, wherein capacitor C 1 pin links to each other with the end of the same name of transformer secondary output, the non-same polarity ground connection of transformer secondary output, another pin of capacitor C 1 links to each other with diode D2 is anodal, inductance L 1 is connected between the anodal end and diode D1 negative pole that links to each other of capacitor C 1 and diode D2, diode D1 plus earth, capacitor C 2 is connected between diode D1 positive pole and the diode D2 negative pole, diode D2 negative pole links to each other with diode D3 is anodal, capacitor C 3 is connected between diode D2 positive pole and the diode D4 positive pole, inductance L 2 is connected between the anodal end and diode D3 negative pole that links to each other of capacitor C 3 and diode D4, capacitor C 4 is connected between the negative pole of diode D3 positive pole and diode D4, and diode D4 negative pole is power output end V
o
2, voltage doubling rectifing circuit according to claim 1, it is characterized in that: transformer secondary output is a double winding, what link to each other with a pin of described capacitor C 1 is the end of the same name of first winding of transformer secondary output, wherein second winding end of the same name links to each other with the first winding different name end, diode D5 positive pole links to each other with diode D1 is anodal, capacitor C 5 is connected between the diode D5 negative pole and the second winding different name end, diode D5 negative pole links to each other with diode D6 is anodal, energy storage inductor L3 is connected between the end and diode D6 negative pole that capacitor C 2 links to each other with diode D2 negative pole, diode D7 positive pole links to each other with diode D3 is anodal, capacitor C 6 is connected between diode D6 positive pole and the diode D7 negative pole, energy storage inductor L4 is connected between the end and diode D8 negative pole that capacitor C 4 links to each other with diode D4 negative pole, and diode D8 positive pole links to each other with diode D7 negative pole.
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| CNB2007101180618A CN100568696C (en) | 2007-06-28 | 2007-06-28 | Voltage doubling rectifing circuit |
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Cited By (1)
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| TWI488417B (en) * | 2011-11-29 | 2015-06-11 | Chung Ming Young | A non-isolated single-phase multilevel inverter for renewable energy system applications |
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