CN101527501B - Power conversion units connected in parallel - Google Patents
Power conversion units connected in parallel Download PDFInfo
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- CN101527501B CN101527501B CN200810086112A CN200810086112A CN101527501B CN 101527501 B CN101527501 B CN 101527501B CN 200810086112 A CN200810086112 A CN 200810086112A CN 200810086112 A CN200810086112 A CN 200810086112A CN 101527501 B CN101527501 B CN 101527501B
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Abstract
本发明涉及一种并联的功率变换装置，包括并联连接在电源和负载之间的N个功率变换电路、N或N-1个电压调整电路、以及控制电路，其中，N≥2，每一个电压调整电路分别设置在一个功率变换电路的前端，控制电路用于检测每一个功率变换电路的输出电压，并向电压调整电路发送控制信号，以调节电压调整电路的输出电压，从而使得每一个功率变换电路具有相同的输出电流。解决了功率变换电路的谐振参数存在差异时，支路电流不均衡，甚至有支路不往副边传递功率的问题。并且不会使得输出阻抗增加和降低功率变换电路的Q值，导致整机的效率降低很多。
The invention relates to a parallel power conversion device, comprising N power conversion circuits connected in parallel between a power supply and a load, N or N-1 voltage adjustment circuits, and a control circuit, wherein, N≥2, each voltage The adjustment circuits are respectively arranged at the front end of a power conversion circuit, and the control circuit is used to detect the output voltage of each power conversion circuit, and send a control signal to the voltage adjustment circuit to adjust the output voltage of the voltage adjustment circuit, so that each power conversion circuits have the same output current. It solves the problem that when there is a difference in the resonance parameters of the power conversion circuit, the branch current is unbalanced, and even some branches do not transmit power to the secondary side. And it will not increase the output impedance and reduce the Q value of the power conversion circuit, resulting in a great reduction in the efficiency of the whole machine.
Description
Technical field
The present invention relates to power conversion unit, more particularly, relate to a kind of power conversion unit of parallel connection.
Background technology
For the power conversion circuit of crisscross parallel, in particular for through the resonance scheme, when reaching the situation of purpose of high efficiency Power Conversion, how to guarantee that the power conversion circuit output current of each branch road is balanced, be a very important problem.The current unevenness of each branch road weighing apparatus will cause branch current stress different, and electric current is big, and riches all the way that heat is serious, and reliability reduces, and reduce useful life.Therefore, guaranteeing the equal properties of flow of the power conversion circuit of each branch road, is a very important design link of the power conversion circuit of crisscross parallel.
When power conversion circuit adopts resonant circuit, Vout=F (fs, C
1, C
2..., L
1, L
2...), wherein, Vout is an output voltage, fs is a switching frequency, C1, C2 ... Be the electric capacity of participating in resonant process, L1, L2 ... It is the inductance of participating in resonant process.The condition of giving tacit consent in this relational expression is that input voltage vin remains unchanged.
Because the input current of resonant circuit and output current all are sinusoidal wave; Therefore the ripple current of I/O is bigger: the scheme of crisscross parallel; Can be above 2 the road staggered, also can be 3 the tunnel, the 4 tunnel even the crisscross parallel of multichannel more, with further reduction ripple current.For simplicity, the situation of 2 road crisscross parallels is all only discussed in following argumentation, but below conclusion be equally applicable to 3 the tunnel, the 4 tunnel even the crisscross parallel of multichannel more.Because resonant circuit is under the certain situation of input voltage, its output voltage is only relevant with the operating frequency of circuit, that is: Vout=F (fs, C
1, C
2..., L
1, L
2...), so ifs circuit crisscross parallel wants to guarantee that 2 branch road phase differences fix, then the switching frequency fs of 2 branch roads must be identical, then the C1 of 2 branch roads, C2 ... With L1, L2 ... Parameter also must be identical.And in fact; The resonant inductance of circuit, the parameter of resonant capacitance all exist certain discreteness and manufacture deviation, and generally in 10%, the capacity tolerance of electric capacity is generally 20% for the inductance value deviation of inductance; Such parameter error is enough to cause 2 road output currents to have great deviation.
Existing Current Sharing Technology has: 1, output characteristic droop method: utilizing increases output resistance, forms output impedance, makes output characteristic sagging, and the branch road output voltage that load is big reduces, and output current reduces naturally.The shortcoming of this scheme is that output impedance increases, and causes the efficient of complete machine to reduce a lot.2, reduce Q value method: the Q value of resonant circuit, relevant with the damping of inductance, electric capacity, the Q value of adjustment resonant circuit also can reach the sagging effect of similar output characteristic.Shortcoming is that the Q value reduces, and causes overall efficiency to reduce a lot.
Summary of the invention
The technical problem that the present invention will solve is, to the above-mentioned defective of prior art, a kind of power conversion unit of efficient parallel connection is provided.
The technical solution adopted for the present invention to solve the technical problems is: the power conversion unit of constructing a kind of parallel connection; Comprise N power conversion circuit, N or the N-1 voltage-regulating circuit and the control circuit that are connected in parallel between power supply and the load; Wherein, N >=2; Each described voltage-regulating circuit is separately positioned on the front end of a described power conversion circuit, and said control circuit is used to detect the output voltage of each described power conversion circuit, and transmits control signal to described voltage-regulating circuit; Make each said power conversion circuit output voltage identical with the output voltage of regulating said voltage-regulating circuit, thereby make each described power conversion circuit have identical output current; Said power conversion circuit is a resonant circuit.
In the power conversion unit of parallel connection of the present invention, said voltage-regulating circuit is Buck circuit, Boost circuit or Buck-Boost circuit.
In a preferred embodiment, a said N power conversion circuit comprises first resonant circuit and second resonant circuit, is provided with first voltage-regulating circuit at the front end of first resonant circuit, is provided with second voltage-regulating circuit at the front end of second resonant circuit.
Preferably, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the said switching tube S1 positive pole, second end that are coupled to power supply is connected with the negative electrode of said diode D1 and the end, the control end that are connected to said inductance component L 1 is connected to said control circuit;
The anode of said diode D1 is coupled to the negative pole of power supply;
The other end of said inductance component L 1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected with the negative electrode of said diode D2 and the end, the control end that are connected to said inductance component L 2 is connected to said control circuit;
The anode of said diode D2 is coupled to the negative pole of power supply;
The other end of said inductance component L 2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
Preferably, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of said inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S1 are connected and are connected to the anode of said diode D1;
Second end of said switching tube S1 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, an end of said inductance component L 2 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S2 are connected and are connected to the anode of said diode D2;
Second end of said switching tube S2 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
Preferably, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of said inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S1 are connected and are connected to the anode of said diode D1;
Second end of said switching tube S1 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to said diode D2;
The anode of said diode D2 is coupled to the negative pole of power supply;
The other end of said inductance component L 2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
Preferably, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the said switching tube S1 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L 1 is connected and is connected to said diode D1;
The other end of said inductance component L 1 is coupled to the negative pole of power supply;
The anode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L 2 is connected and is connected to said diode D2;
The other end of said inductance component L 2 is coupled to the negative pole of power supply;
The anode of said diode D2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
In another preferred embodiment, a said N power conversion circuit comprises first resonant circuit and second resonant circuit, is provided with voltage-regulating circuit at the front end of first resonant circuit or second resonant circuit.
Preferably, said voltage-regulating circuit comprises: switching tube S, inductance component L, diode D and capacitor C;
Wherein, first end of the said switching tube S positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L is connected and is connected to said diode D;
The other end of said inductance component L is coupled to the negative pole of power supply;
The anode of said diode D is connected with an end of said capacitor C;
The other end of said capacitor C is coupled to the negative pole of power supply.
The power conversion unit of the parallel connection of embodiment of the present invention; Has following beneficial effect: owing to be provided with voltage-regulating circuit at the front end of power conversion circuit; The power conversion circuit that can make each branch road is with misphase work frequently; The voltage of the voltage-regulating circuit of regulating respectively makes the power conversion circuit output voltage of each branch road identical, thereby makes the output current of power conversion circuit of each branch road identical.When the resonant parameter that has solved power conversion circuit there are differences, branch current was unbalanced, even branch road was arranged not toward the problem of secondary transmitted power.And can not make output impedance increase and reduce the Q value of power conversion circuit, cause the efficient of complete machine to reduce a lot.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the theory diagram of a preferred embodiment of the parallelly connected power conversion unit of the present invention;
Fig. 2 is the power conversion unit circuit theory diagrams of parallel connection shown in Figure 1;
Fig. 3 is the power conversion unit circuit theory diagrams of parallel connection shown in Figure 1;
Fig. 4 is the power conversion unit circuit theory diagrams of parallel connection shown in Figure 1;
Fig. 5 is the power conversion unit circuit theory diagrams of parallel connection shown in Figure 1;
Fig. 6 is the theory diagram of another preferred embodiment of the parallelly connected power conversion unit of the present invention;
Fig. 7 is the power conversion unit circuit theory diagrams of parallel connection shown in Figure 6.
Embodiment
As shown in figs. 1 and 6, in the power conversion unit of parallel connection of the present invention, be front end at power conversion circuit; Increase by one road voltage-regulating circuit again; Because the variation of input voltage also can cause the variation of output voltage, through the variation of input voltage of adjustment power conversion circuit; Adjust the voltage gain of the power conversion circuit of branch road, reach the purpose of adjustment current-sharing.When being resonant circuit for power conversion circuit, under the situation that the fs of resonant circuit fixes, the variation of the input voltage of resonant circuit; Can cause the variation of output voltage; Through the adjusting of adjustment circuit output voltage, can adjust the output voltage of resonant circuit, reach the purpose of adjustment current-sharing.Resonant circuit at this indication is all topological circuits with resonance manner work.That is: comprise antiresonant circuit, series resonant circuit, LLC resonant circuit etc. all come the circuit of control output voltage through switching frequency.
In the preferred embodiment as shown in Figure 1, comprise N the power conversion circuit, a N voltage-regulating circuit and the control circuit that are connected in parallel between power supply and the load; Wherein, N >=2; The voltage-regulating circuit of each is separately positioned on the front end of a power conversion circuit, and control circuit is used to detect the output voltage of each power conversion circuit, and transmits control signal to voltage-regulating circuit; With the output voltage of regulation voltage adjustment circuit, thereby make each power conversion circuit have identical output current.
Especially; When being resonant circuit for power conversion circuit, the power conversion unit that this is parallelly connected comprises first resonant circuit and second resonant circuit; Front end at first resonant circuit is provided with first voltage-regulating circuit, is provided with second voltage-regulating circuit at the front end of second resonant circuit.
As shown in Figure 2, in a preferred practical implementation, voltage-regulating circuit adopts Buck circuit adjustment method, and first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1; Wherein, first end of the switching tube S1 positive pole, second end that are coupled to power supply is connected with the negative electrode of diode D1 and the end, the control end that are connected to inductance component L 1 is connected to control circuit; The anode of diode D1 is coupled to the negative pole of power supply; The other end of inductance component L 1 is connected with an end of capacitor C 1; The other end of capacitor C 1 is coupled to the negative pole of power supply; Second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2; Wherein, first end of the switching tube S2 positive pole, second end that are coupled to power supply is connected with the negative electrode of diode D2 and the end, the control end that are connected to inductance component L 2 is connected to control circuit; The anode of diode D2 is coupled to the negative pole of power supply; The other end of inductance component L 2 is connected with an end of capacitor C 2; The other end of capacitor C 2 is coupled to the negative pole of power supply.
As shown in Figure 3, in another preferred practical implementation, voltage-regulating circuit adopts Boost circuit adjustment method, states first voltage-regulating circuit and comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1; Wherein, an end of inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of switching tube S1 are connected and are connected to the anode of diode D1; Second end of switching tube S1 is coupled to the negative pole of power supply, and control end is connected to control circuit; The negative electrode of diode D1 is connected with an end of capacitor C 1; The other end of capacitor C 1 is coupled to the negative pole of power supply; Second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2; Wherein, an end of inductance component L 2 is coupled to the positive pole of power supply, and the other end and first end of switching tube S2 are connected and are connected to the anode of diode D2; Second end of switching tube S2 is coupled to the negative pole of power supply, and control end is connected to control circuit; The negative electrode of diode D2 is connected with an end of capacitor C 2; The other end of capacitor C 2 is coupled to the negative pole of power supply.
As shown in Figure 4, in another preferred practical implementation, voltage-regulating circuit adopts Buck/Boost circuit adjustment method, and first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1; Wherein, an end of inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of switching tube S1 are connected and are connected to the anode of diode D1; Second end of switching tube S1 is coupled to the negative pole of power supply, and control end is connected to control circuit; The negative electrode of diode D1 is connected with an end of capacitor C 1; The other end of capacitor C 1 is coupled to the negative pole of power supply; Second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2; Wherein, first end of the switching tube S2 positive pole, second end that are coupled to power supply is connected to control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to diode D2; The anode of diode D2 is coupled to the negative pole of power supply; The other end of inductance component L 2 is connected with an end of capacitor C 2; The other end of capacitor C 2 is coupled to the negative pole of power supply.
As shown in Figure 5, in a preferred practical implementation again, voltage-regulating circuit adopts Buck-Boost circuit adjustment method, and first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1; Wherein, first end of the switching tube S1 positive pole, second end that are coupled to power supply is connected to control circuit with negative electrode, the control end that an end of inductance component L 1 is connected and is connected to diode D1; The other end of inductance component L 1 is coupled to the negative pole of power supply; The anode of diode D1 is connected with an end of capacitor C 1; The other end of capacitor C 1 is coupled to the negative pole of power supply; Second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2; Wherein, first end of the switching tube S2 positive pole, second end that are coupled to power supply is connected to control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to diode D2; The other end of inductance component L 2 is coupled to the negative pole of power supply; The anode of diode D2 is connected with an end of capacitor C 2; The other end of capacitor C 2 is coupled to the negative pole of power supply.
In another preferred embodiment as shown in Figure 6, comprise N the power conversion circuit, a N-1 voltage-regulating circuit and the control circuit that are connected in parallel between power supply and the load; Because regulate the variation of the output voltage of N-1 branch road, just can adjust the current-sharing on N road, therefore also can simplify the prime voltage-regulating circuit, only increase N-1 adjustment circuit.Wherein, N >=2; The voltage-regulating circuit of each is separately positioned on the front end of a power conversion circuit, and control circuit is used to detect the output voltage of each power conversion circuit, and transmits control signal to voltage-regulating circuit; With the output voltage of regulation voltage adjustment circuit, thereby make each power conversion circuit have identical output current.
Especially, when being resonant circuit for power conversion circuit, the power conversion unit that this is parallelly connected comprises first resonant circuit and second resonant circuit, at the front end of first resonant circuit or second resonant circuit.
As shown in Figure 7, in a preferred practical implementation, voltage-regulating circuit comprises: switching tube S, inductance component L, diode D and capacitor C; Wherein, first end of the switching tube S positive pole, second end that are coupled to power supply is connected to control circuit with negative electrode, the control end that an end of inductance component L is connected and is connected to diode D; The other end of inductance component L is coupled to the negative pole of power supply; The anode of diode D is connected with an end of said capacitor C; The other end of capacitor C is coupled to the negative pole of power supply.
In the power conversion unit of the present invention parallel connection, the basic circuit of voltage-regulating circuit is circuit such as Buck, Boost, Buck-Boost, also can be the circuit of deriving that has added auxiliary circuit, like soft switch circuit, half-bridge, full-bridge, circuit such as recommend.
The present invention describes through some embodiment, and those skilled in the art know, under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes or equivalence replacement to these characteristics and embodiment.In addition, under instruction of the present invention, can make amendment to these characteristics and embodiment can not break away from the spirit and scope of the present invention to adapt to concrete situation and material.Therefore, the present invention does not receive the restriction of specific embodiment disclosed herein, and all interior embodiment of claim scope that fall into the application belong to protection scope of the present invention.
Claims (9)
1. the power conversion unit of a parallel connection comprises N the power conversion circuit that is connected in parallel between power supply and the load, and wherein, N >=2 is characterized in that, also comprise a N or N-1 voltage-regulating circuit and control circuit; Each described voltage-regulating circuit is separately positioned on the front end of a described power conversion circuit; Said control circuit is used to detect the output voltage of each described power conversion circuit; And transmit control signal to described voltage-regulating circuit; Make each said power conversion circuit output voltage identical with the output voltage of regulating said voltage-regulating circuit, thereby make each described power conversion circuit have identical output current; Said power conversion circuit is a resonant circuit.
2. the power conversion unit of parallel connection according to claim 1 is characterized in that, said voltage-regulating circuit is Buck circuit, Boost circuit or Buck-Boost circuit.
3. the power conversion unit of parallel connection according to claim 1; It is characterized in that; A said N power conversion circuit comprises first resonant circuit and second resonant circuit; Front end at first resonant circuit is provided with first voltage-regulating circuit, is provided with second voltage-regulating circuit at the front end of second resonant circuit.
4. the power conversion unit of parallel connection according to claim 3 is characterized in that, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the said switching tube S1 positive pole, second end that are coupled to power supply is connected with the negative electrode of said diode D1 and the end, the control end that are connected to said inductance component L 1 is connected to said control circuit;
The anode of said diode D1 is coupled to the negative pole of power supply;
The other end of said inductance component L 1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected with the negative electrode of said diode D2 and the end, the control end that are connected to said inductance component L 2 is connected to said control circuit;
The anode of said diode D2 is coupled to the negative pole of power supply;
The other end of said inductance component L 2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
5. the power conversion unit of parallel connection according to claim 3 is characterized in that, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of said inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S1 are connected and are connected to the anode of said diode D1;
Second end of said switching tube S1 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, an end of said inductance component L 2 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S2 are connected and are connected to the anode of said diode D2;
Second end of said switching tube S2 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
6. the power conversion unit of parallel connection according to claim 3 is characterized in that, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of said inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of said switching tube S1 are connected and are connected to the anode of said diode D1;
Second end of said switching tube S1 is coupled to the negative pole of power supply, and control end is connected to said control circuit;
The negative electrode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to said diode D2;
The anode of said diode D2 is coupled to the negative pole of power supply;
The other end of said inductance component L 2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
7. the power conversion unit of parallel connection according to claim 3 is characterized in that, said first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the said switching tube S1 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L 1 is connected and is connected to said diode D1;
The other end of said inductance component L 1 is coupled to the negative pole of power supply;
The anode of said diode D1 is connected with an end of said capacitor C 1;
The other end of said capacitor C 1 is coupled to the negative pole of power supply;
Said second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the said switching tube S2 positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L 2 is connected and is connected to said diode D2;
The other end of said inductance component L 2 is coupled to the negative pole of power supply;
The anode of said diode D2 is connected with an end of said capacitor C 2;
The other end of said capacitor C 2 is coupled to the negative pole of power supply.
8. the power conversion unit of parallel connection according to claim 1 is characterized in that, a said N power conversion circuit comprises first resonant circuit and second resonant circuit, is provided with voltage-regulating circuit at the front end of first resonant circuit or second resonant circuit.
9. the power conversion unit of parallel connection according to claim 8 is characterized in that, said voltage-regulating circuit comprises: switching tube S, inductance component L, diode D and capacitor C;
Wherein, first end of the said switching tube S positive pole, second end that are coupled to power supply is connected to said control circuit with negative electrode, the control end that an end of said inductance component L is connected and is connected to said diode D;
The other end of said inductance component L is coupled to the negative pole of power supply;
The anode of said diode D is connected with an end of said capacitor C;
The other end of said capacitor C is coupled to the negative pole of power supply.
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| CN101674016B (en) * | 2009-10-01 | 2012-01-11 | 旭丽电子(广州)有限公司 | Power supply device and current sharing control method |
| TWI422135B (en) * | 2010-01-18 | 2014-01-01 | Lite On Electronics Guangzhou | Power supply device |
| US9083242B2 (en) * | 2010-12-17 | 2015-07-14 | General Electric Company | Interleaved LLC converter employing active balancing |
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