CN104092391A - Zero-loss rectifying circuit for induction electricity obtaining power supply - Google Patents
Zero-loss rectifying circuit for induction electricity obtaining power supply Download PDFInfo
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Abstract
The invention discloses a zero-loss rectifying circuit for an induction electricity obtaining power supply. The zero-loss rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode. In addition, the zero-loss rectifying circuit further comprises four MOSFETs correspondingly connected with the four diodes in parallel and a logic control module, wherein the logic control module comprises a signal voltage divider and a comparison circuit and controls connection and disconnection of all the MOSFETs so that the MOSFETs can replace the diodes correspondingly connected with the MOSFETs in parallel to serve as channels of rectification conversion signals under the connection state. The zero-loss rectifying circuit for the induction electricity obtaining power supply achieves zero rectification voltage drop, thereby achieving zero losses.
Description
Technical field
The present invention relates to a kind of power component circuit, relate in particular to a kind of rectification circuit.
Background technology
Rectification circuit is as a kind of power component circuit, and it comprises that four diodes form Qiao road, realizes the AC signal of input to the conversion of the direct current signal of output.
Within each work period of rectification circuit, the same time only has two diode operation, by the one-way conduction function of diode, AC signal is converted to unidirectional DC pulse signal.Due to the pressure drop of diode itself, make rectification circuit inevitably can produce certain loss in the process using, especially obtain field at energy conversion, above-mentioned loss will affect the performance of whole circuit.Therefore, the loss of reduction rectification circuit is a focus of energy harvesting area research.
Publication number is CN102468741A, open day is on May 23rd, 2012, the Chinese patent literature that name is called " rectification circuit " discloses a kind of control method of rectification circuit, in the time that load current is less than reference current, rectification circuit is in light condition, control circuit reduces the switching frequency of switching circuit, both can improve the underloading frequency reducing efficiency of power supply unit, can effectively reduce again the ripple voltage component in this Output Voltage in Rectified Circuits.
Publication number is CN102075102A, open day is on May 25th, 2011, the Chinese patent literature that name is called " bridge rectifier " discloses a kind of rectification circuit, it replaces two underarm diodes of rectifier bridge with N-channel MOS FET, and realize the control of MESFET by control circuit, thereby the loss of rectifier bridge is reduced to half.
Publication number is CN101626198, and open day is on January 13rd, 2010, and the Chinese patent literature that name is called " high efficiency active rectifying circuit " discloses a kind of Half bridge rectifier circuit, and it adopts MOSFET to complete half-bridge circuit, realizes lower loss.
For the rectification circuit in energy conversion field, its rectifier loss is more low better, and therefore the disclosed rectification circuit of above-mentioned these patent documentations also has improved space.
Summary of the invention
The object of the present invention is to provide a kind of induction power taking zero loss rectification circuit for power supply, it can realize zero rectification pressure drop, thereby realizes zero loss of rectification circuit.
To achieve these goals, the present invention proposes a kind of induction power taking zero loss rectification circuit for power supply, being used for is direct-flow output signal by ac input signal rectifying conversion, comprise the first diode, the second diode, the 3rd diode and the 4th diode, wherein the negative pole of the first diode is connected with the positive pole of the second diode, the negative pole of the second diode is connected with the negative pole of the 3rd diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the positive pole of the 4th diode is connected and is connected with the positive pole of the first diode, wherein the negative pole of the first diode is connected ac input end with the negative pole of the 4th diode, the positive pole of the first diode is connected DC output end with the negative pole of the second diode, it also comprises:
The one MOSFET, the 2nd MOSFET, the 3rd MOSFET and the 4th MOSFET, it is corresponding with the first diode, the second diode, the 3rd diode and the 4th diode in parallel respectively;
Logic control module, described Logic control module is according to the AC signal that is received from ac input end, output logic control signal is controlled the conducting of each MOSFET and is blocked, so that each MOSFET substitutes the passage of in parallel diode corresponding to it as rectifying conversion signal under the state of conducting; Described Logic control module comprises:
Signal divider, its input connects described ac input end, and described signal divider is to export for after the voltage of following comparison circuit processing by the alternating voltage dividing potential drop of ac input end input;
Comparison circuit, it is connected with the output of signal divider, and the AC signal that is received from signal divider output is converted to control signal output by described comparison circuit;
The first driver, the second driver, the 3rd driver and the 4th driver, the input of described each driver is all connected with the output of described comparison circuit, the output of described the first driver, the second driver, the 3rd driver and the 4th driver respectively with corresponding connection of grid of a described MOSFET, the 2nd MOSFET, the 3rd MOSFET and the 4th MOSFET, export described logic control signal with the conducting of corresponding each MOSFET of control respectively and block.
Zero loss rectification circuit for induction power taking power supply of the present invention, comprise the conventional rectifier bridge being formed by four diodes, by four MOSFET and described four diodes are distinguished corresponding in parallel, thereby form four brachium pontis of rectifier bridge of the present invention, in the time of voltage over zero, be responsible for rectification by diode, then control MOSFET according to the conducting sequential conducting of former diode, thereby formed the conducting branch road of a zero pressure drop by MOSFET to replace the passage of former diode as rectifying conversion signal, realize the zero energy loss of rectification circuit, improve the efficiency of whole rectification circuit.Specifically, when induction power taking power supply of the present invention is worked with zero loss rectification circuit, receive ac input signal from ac input end, export direct-flow output signal through rectifying conversion from DC output end; Wherein, when ac input signal is positive half wave, from rectifier bridge operation principle, the second diode and the 4th diode current flow, now, Logic control module control the 2nd MOSFET and the 4th MOSFET conducting, because it is considered as zero conduction voltage drop (conducting resistance is milliohm level only), cause the second diode and the cut-off of the 4th diode, now energy loss only produces on the 2nd MOSFET and the 4th MOSFET, and this device energy consumption is considered as zero; In like manner, when ac input signal is negative half-wave, the first diode and the 3rd diode current flow, now, Logic control module control the one MOSFET and the 3rd MOSFET conducting, due to its conduction voltage drop that is considered as zero, cause the first diode and the cut-off of the 3rd diode, now energy loss only produces on a MOSFET and the 3rd MOSFET, and this device energy consumption is considered as zero.Described Logic control module by judge the positive and negative half-wave state of ac input signal provide four MOSFET of corresponding logic control signal control with four conducting of conducting sequential and cut-offs that diode is identical, thereby substitute diode as the passage of rectifying conversion signal; Wherein, comparison circuit receives the ac input signal after signal divider dividing potential drop, the level different according to different half-wave State-outputs, this level generates the grid of final four MOSFET of logic control signal control through four drivers, thereby controls its conducting and cut-off.Induction power taking power supply of the present invention, with in zero loss rectification circuit switching process, has replaced the passage of the higher diode of loss as rectifying conversion signal by the MOSFET of zero loss, thereby realizes zero loss of rectification circuit.
Further, induction power taking power supply of the present invention is with in zero loss rectification circuit, and described DC output end andlogic control module connects, and thinks Logic control module power supply.Due to DC output end output be direct current, therefore can utilize it is Logic control module power supply.
Further, induction power taking power supply of the present invention also comprises DC power supply with zero loss rectification circuit, and its andlogic control module connects, and thinks Logic control module power supply.In order to reduce to greatest extent output loss, also can separately get DC power supply is Logic control module power supply.
Further, induction power taking power supply of the present invention is with in zero loss rectification circuit, described signal divider at least comprises the first resistance and the second resistance that are connected in series, after the first resistance and the second resistance are connected in series, be connected in described ac input end, the output of described signal divider is connected between the first resistance and the second resistance.Described signal divider utilizes a point compression functions for resistance series connection to carry out dividing potential drop to ac input signal.
Further, at induction power taking power supply of the present invention with in zero loss rectification circuit, described comparison circuit comprises reverse comparator, the reverse input end of described reverse comparator connects the output of signal divider, oppositely the input in the same way of comparator connects benchmark signal, the output that oppositely output of comparator is described comparison circuit.
Further, at above-mentioned induction power taking power supply, with in zero loss rectification circuit, described comparison circuit also comprises the 3rd resistance and the 4th resistance; One end of described the 3rd resistance is connected to the input in the same way of reverse comparator, and the other end of described the 3rd resistance is connected in the output of reverse comparator; One end of described the 4th resistance is connected in the input in the same way of reverse comparator, the other end ground connection of described the 4th resistance.
Further, induction power taking power supply of the present invention, with in zero loss rectification circuit, is connected with resistance between the grid of described MOSFET and source electrode or between grid and drain electrode.This resistance plays and draws or the effect of drop-down current potential.
Further, induction power taking power supply of the present invention is with in zero loss rectification circuit, and a described MOSFET and the 4th MOSFET are N-channel MOS FET, and described the 2nd MOSFET and the 3rd MOSFET are P channel mosfet; The drain electrode of the one MOSFET and the 2nd MOSFET connects respectively the negative pole of the first diode and the second diode, and the drain electrode of the 3rd MOSFET and the 4th MOSFET connects respectively the positive pole of the 3rd diode and the 4th diode; The source electrode of the one MOSFET and the 2nd MOSFET connects respectively the positive pole of the first diode and the second diode, and the source electrode of the 3rd MOSFET and the 4th MOSFET connects respectively the negative pole of the 3rd diode and the 4th diode.
Further, above-mentioned induction power taking power supply, with in zero loss rectification circuit, is connected with respectively resistance between the grid of a described MOSFET and the 3rd MOSFET and drain electrode, between the grid of the 2nd MOSFET and the 4th MOSFET and source electrode, is connected with respectively resistance.
Induction power taking power supply disclosed by the invention is with zero loss rectification circuit owing to having adopted above technical scheme, and the rectification pressure drop that makes rectification circuit is zero, is zero thereby make the loss of rectification circuit.
Brief description of the drawings
Fig. 1 is the circuit diagram of induction power taking power supply of the present invention zero loss rectification circuit under a kind of execution mode.
Fig. 2 is the circuit diagram of the induction power taking power supply of the present invention Logic control module of zero loss rectification circuit under a kind of execution mode.
Embodiment
Below in conjunction with Figure of description and specific embodiment, induction power taking power supply of the present invention is made to further explanation and explanation with zero loss rectification circuit.
Fig. 1 has illustrated the circuit of induction power taking power supply of the present invention zero loss rectification circuit under a kind of execution mode.
As shown in Figure 1, the zero loss rectification circuit for induction power taking power supply of the present embodiment, comprising: four diodes are respectively the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; Four MOSFET are respectively a MOSFET T1, the 2nd MOSFET T2, the 3rd MOSFET T3 and the 4th MOSFET T4; Four resistance R 1, R2, R3 and R4.As shown in Figure 1, diode D1, D2, D3 and D4 form conventional rectification circuit to its annexation, IN+ and IN-are ac input signal, and Vcc and GND are direct-flow output signal, the MOSFET T2 of P raceway groove and T3 are in parallel with diode D2 and D3 respectively, and the MOSFET T1 of N raceway groove and T4 are in parallel with diode D1 and D4 respectively, the power supply of Logic control module U is provided by output Vcc and the GND of rectification circuit, four logic control signal output g1, g2, g3 and g4 respectively with MOSFET T1, T2, the grid of T3 and T4 is connected, the grid voltage of MOSFET is respectively Vg1, Vg2, Vg3 and Vg4, source voltage is respectively Vs1, Vs2, Vs3 and Vs4, drain voltage is respectively Vd1, Vd2, Vd3 and Vd4, resistance R 2 and R3 are respectively the pull-up resistor of MOSFET T2 and T3, in the time that grid control level is tri-state, grid voltage is pulled to source voltage, resistance R 1 and R4 are respectively the pull down resistor of MOSFET T1 and T4, in the time that grid control level is tri-state, grid voltage is pulled down to drain voltage, Logic control module U detects ac input signal IN+ and IN-in real time, according to the phase place of ac input signal routinely under rectification circuit diode current flow sequential select different MOSFET conductings, so that each MOSFET substitutes the passage of in parallel diode corresponding to it as rectifying conversion signal under the state of conducting, thereby realize the low-loss rectification to ac input signal IN+ and IN-, output direct-flow output signal Vcc and GND.
Fig. 2 has illustrated the circuit structure of the induction power taking power supply of the present invention Logic control module of zero loss rectification circuit under a kind of execution mode.
As shown in Figure 2, the Logic control module U of the present embodiment comprises: signal divider, reverse comparison circuit and four driver G1, G2, G3 and G4, wherein signal divider comprises the first resistance R 5 and second resistance R 6 of series connection, and oppositely comparison circuit comprises reverse comparator U1, resistance R 7 and resistance R 8.Connected mode is as figure, and ac input signal IN+ and IN-connect the two ends of R5 and the R6 of series connection, and g1, g2, g3 and g4 are respectively the output of four driver G1, G2, G3 and G4.In addition, Vcc and GND are for oppositely comparator and driver provide power supply.Resistance R 5 and R6 form signal divider, voltage between ac input signal IN+ and IN-is divided into the voltage levvl that can process for reverse comparator U1, resistance R 5 one termination IN+, one end is connected with resistance R 6 in addition, be linked into the reverse input end of reverse comparator U1 simultaneously, an other termination IN-of resistance R 6, resistance R 7, R8 and oppositely comparator U1 form reverse comparison circuit, resistance R 8 one termination GND, one end is connected with resistance R 7 in addition, be linked into the input in the same way of reverse comparator U1 simultaneously, other one end of resistance R 7 is connected with the output of reverse comparator U1.Get R8>>R7, make benchmark be approximately zero, oppositely comparator U1 converts ac input signal IN+ and IN-to pulse output signals, is linked into respectively the input of four driver G1, G2, G3 and G4; Driver has input and output, and wherein, in the time that driver input end input signal is GND, driver G1 and G3 are output as tri-state, and driver G2 and G4 are output as GND; In the time that driver input end input signal is Vcc, driver G1 and G3 are output as GND, and driver G2 and G4 are output as tri-state.Four output g1, g2, g3 and the g4 of driver G1, G2, G3 and G4 are the output of whole Logic control module U.
The specific works process of the present embodiment is incorporated by reference to reference to figure 1 and Fig. 2:
In the time that ac input signal IN+ and IN-are positive half wave, be VIN+> Vcc>GND>VIN-, oppositely the reverse input end signal of comparator U1 is for just, be output as GND, the input input signal of four driver G1, G2, G3 and G4 is GND, the output g1 of driver G1 and G3 and g3 are tri-state, and the output g2 of driver G2 and G4 and g4 are GND.For MOSFET T1, because g1 is tri-state, Vg1 is pulled down to VIN+, so not conducting of T1; For MOSFET T2, because g2 is GND, Vg2=GND, Vs2=VIN+, and VIN+>GND, therefore T2 conducting; For MOSFET T3, because g3 is tri-state, therefore Vg3 is pulled to VIN-, so not conducting of T3; For T4, because g4 is GND, Vg4=GND, Vd4=VIN-, GND>VIN-, therefore T4 conducting; Now signal path is IN+-T2-Vcc-GND-T4-IN-.
When ac input signal IN+ and IN-are during for negative half-wave, be VIN-> Vcc>GND>VIN+, oppositely the reverse input end signal of comparator U1 is for negative, be output as Vcc, the input input signal of four driver G1, G2, G3 and G4 is Vcc, the output g1 of driver G1 and G3 and g3 are GND, and the output g2 of driver G2 and G4 and g4 are tri-state.For MOSFET T1, because g1 is GND, Vg1=GND, Vd1=VIN+, GND>VIN+, therefore T1 conducting; For MOSFET T2, because g2 is tri-state, therefore Vg2 is pulled down to VIN+, not conducting of T2; For MOSFET T3, because g3 is GND, Vg3=GND, Vd3=VIN-, VIN->GND, therefore T3 conducting; For MOSFET T4, because g4 is tri-state, therefore Vg4 is pulled to VIN-, its not conducting of T4.Now signal path is IN--T3-Vcc-GND-T1-IN+.
During due to MOSFET T2 and T4 or T3 and T1 conducting, conducting resistance is only milliohm rank, and therefore loss is considered as zero.As can be seen here, have corresponding MOSFET conducting within the scope of the positive and negative half-wave of ac input signal IN+ and IN-, its minimum conducting resistance makes the pressure drop of rectification circuit and loss be zero.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.
Claims (9)
1. an induction power taking zero loss rectification circuit for power supply, being used for is direct-flow output signal by ac input signal rectifying conversion, comprise the first diode, the second diode, the 3rd diode and the 4th diode, wherein the negative pole of the first diode is connected with the positive pole of the second diode, the negative pole of the second diode is connected with the negative pole of the 3rd diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the positive pole of the 4th diode is connected and is connected with the positive pole of the first diode, wherein the negative pole of the first diode is connected ac input end with the negative pole of the 4th diode, the positive pole of the first diode is connected DC output end with the negative pole of the second diode, it is characterized in that, also comprise:
The one MOSFET, the 2nd MOSFET, the 3rd MOSFET and the 4th MOSFET, it is corresponding with the first diode, the second diode, the 3rd diode and the 4th diode in parallel respectively;
Logic control module, described Logic control module is according to the AC signal that is received from ac input end, output logic control signal is controlled the conducting of each MOSFET and is blocked, so that each MOSFET substitutes the passage of in parallel diode corresponding to it as rectifying conversion signal under the state of conducting; Described Logic control module comprises:
Signal divider, its input connects described ac input end, and described signal divider is to export for after the voltage of following comparison circuit processing by the alternating voltage dividing potential drop of ac input end input;
Comparison circuit, it is connected with the output of signal divider, and the AC signal that is received from signal divider output is converted to control signal output by described comparison circuit;
The first driver, the second driver, the 3rd driver and the 4th driver, the input of described each driver is all connected with the output of described comparison circuit, the output of described the first driver, the second driver, the 3rd driver and the 4th driver respectively with corresponding connection of grid of a described MOSFET, the 2nd MOSFET, the 3rd MOSFET and the 4th MOSFET, export described logic control signal with the conducting of corresponding each MOSFET of control respectively and block.
2. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, is characterized in that, described DC output end andlogic control module connects, and thinks Logic control module power supply.
3. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, is characterized in that, also comprises DC power supply, and its andlogic control module connects, and thinks Logic control module power supply.
4. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, it is characterized in that, described signal divider at least comprises the first resistance and the second resistance that are connected in series, after the first resistance and the second resistance are connected in series, be connected in described ac input end, the output of described signal divider is connected between the first resistance and the second resistance.
5. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, it is characterized in that, described comparison circuit comprises reverse comparator, the reverse input end of described reverse comparator connects the output of signal divider, oppositely the input in the same way of comparator connects benchmark signal, the output that oppositely output of comparator is described comparison circuit.
6. zero loss rectification circuit for induction power taking power supply as claimed in claim 5, is characterized in that, described comparison circuit also comprises the 3rd resistance and the 4th resistance; One end of described the 3rd resistance is connected to the input in the same way of reverse comparator, and the other end of described the 3rd resistance is connected in the output of reverse comparator; One end of described the 4th resistance is connected in the input in the same way of reverse comparator, the other end ground connection of described the 4th resistance.
7. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, is characterized in that, between the grid of described MOSFET and source electrode or between grid and drain electrode, is connected with resistance.
8. zero loss rectification circuit for induction power taking power supply as claimed in claim 1, is characterized in that, a described MOSFET and the 4th MOSFET are N-channel MOS FET, and described the 2nd MOSFET and the 3rd MOSFET are P channel mosfet; The drain electrode of the one MOSFET and the 2nd MOSFET connects respectively the negative pole of the first diode and the second diode, and the drain electrode of the 3rd MOSFET and the 4th MOSFET connects respectively the positive pole of the 3rd diode and the 4th diode; The source electrode of the one MOSFET and the 2nd MOSFET connects respectively the positive pole of the first diode and the second diode, and the source electrode of the 3rd MOSFET and the 4th MOSFET connects respectively the negative pole of the 3rd diode and the 4th diode.
9. zero loss rectification circuit for induction power taking power supply as claimed in claim 6, it is characterized in that, between the grid of a described MOSFET and the 3rd MOSFET and drain electrode, be connected with respectively resistance, between the grid of the 2nd MOSFET and the 4th MOSFET and source electrode, be connected with respectively resistance.
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| CN201410354831.9A CN104092391B (en) | 2014-07-24 | 2014-07-24 | Zero-loss rectifying circuit for induction electricity obtaining power supply |
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