CN101527501A - Parallel power conversion device - Google Patents
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- CN101527501A CN101527501A CN200810086112A CN200810086112A CN101527501A CN 101527501 A CN101527501 A CN 101527501A CN 200810086112 A CN200810086112 A CN 200810086112A CN 200810086112 A CN200810086112 A CN 200810086112A CN 101527501 A CN101527501 A CN 101527501A
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Abstract
The invention relates to a parallel power conversion device, which comprises N power conversion circuits, N or N-1 voltage regulation circuits and a control circuit, wherein the N is more than or equal to 2, each voltage regulation circuit is respectively arranged at the front end of one power conversion circuit, and the control circuit is used for detecting the output voltage of each power conversion circuit and sending a control signal to the voltage regulation circuits to regulate the output voltage of the voltage regulation circuits, so that each power conversion circuit has the same output current. The problem of when power conversion circuit's resonance parameter has the difference, the branch road current is unbalanced, even has the branch road not to the transmission power of vice limit is solved. And the output impedance is not increased, the Q value of the power conversion circuit is not reduced, and the efficiency of the whole machine is greatly reduced.
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 by the resonance scheme, when reaching the situation of purpose of high efficiency Power Conversion, how to guarantee the power conversion circuit output current equilibrium of each branch road, 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 that participates in resonant process, L1, L2 ... it is the inductance that participates 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 following conclusion is 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 to be solved in the present invention is, at the above-mentioned defective of prior art, provides a kind of power conversion unit of efficient parallel connection.
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 the power conversion circuit that is connected in parallel between power supply and the load, a N or N-1 voltage-regulating circuit, and control circuit, wherein, N 〉=2, each described voltage-regulating circuit is separately positioned on the front end of a described power conversion circuit, described control circuit is used to detect the output voltage of each described power conversion circuit, and transmit control signal to described voltage-regulating circuit, regulating the output voltage of described voltage-regulating circuit, thereby make each described power conversion circuit have identical output current.
In the power conversion unit of parallel connection of the present invention, described voltage-regulating circuit is Buck circuit, Boost circuit, Buck-Boost circuit or the circuit of deriving that has added auxiliary circuit.
In the power conversion unit of parallel connection of the present invention, the described circuit of deriving is soft switch circuit, half-bridge circuit, full-bridge circuit or push-pull circuit.
In the power conversion unit of parallel connection of the present invention, described power conversion circuit is a resonant circuit.
In a preferred embodiment, comprise first resonant circuit and second resonant circuit, be provided with first voltage-regulating circuit at the front end of first resonant circuit, be provided with second voltage-regulating circuit at the front end of second resonant circuit.
Preferably, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the described switching tube S1 positive pole, second end that are coupled to power supply is connected with the negative electrode of described diode D1 and the end, the control end that are connected to described inductance component L 1 is connected to described control circuit;
The anode of described diode D1 is coupled to the negative pole of power supply;
The other end of described inductance component L 1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected with the negative electrode of described diode D2 and the end, the control end that are connected to described inductance component L 2 is connected to described control circuit;
The anode of described diode D2 is coupled to the negative pole of power supply;
The other end of described inductance component L 2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
Preferably, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of described inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S1 are connected and are connected to the anode of described diode D1;
Second end of described switching tube S1 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, an end of described inductance component L 2 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S2 are connected and are connected to the anode of described diode D2;
Second end of described switching tube S2 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
Preferably, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of described inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S1 are connected and are connected to the anode of described diode D1;
Second end of described switching tube S1 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to described diode D2;
The anode of described diode D2 is coupled to the negative pole of power supply;
The other end of described inductance component L 2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
Preferably, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the described switching tube S1 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L 1 is connected and is connected to described diode D1;
The other end of described inductance component L 1 is coupled to the negative pole of power supply;
The anode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L 2 is connected and is connected to described diode D2;
The other end of described inductance component L 2 is coupled to the negative pole of power supply;
The anode of described diode D2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
In another preferred embodiment, comprise first resonant circuit and second resonant circuit, be provided with voltage-regulating circuit at the front end of first resonant circuit or second resonant circuit.
Preferably, described voltage-regulating circuit comprises: switching tube S, inductance component L, diode D and capacitor C;
Wherein, first end of the described switching tube S positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L is connected and is connected to described diode D;
The other end of described inductance component L is coupled to the negative pole of power supply;
The anode of described diode D is connected with an end of described capacitor C;
The other end of described capacitor C is coupled to the negative pole of power supply.
Implement the power conversion unit of parallel connection 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 Tiao Jieing makes the power conversion circuit output voltage of each branch road identical respectively, 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
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram of a preferred embodiment of the power conversion unit of parallel connection 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 power conversion unit of parallel connection 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, it is 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, the variation of the input voltage by adjusting power conversion circuit, adjust the voltage gain of the power conversion circuit of branch road, reach the purpose of adjusting 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, by adjusting the adjusting of circuit output voltage, can adjust the output voltage of resonant circuit, reach the purpose of adjusting current-sharing.At the resonant circuit of 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 by 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, control circuit is used to detect the output voltage of each power conversion circuit, and transmit control signal to voltage-regulating circuit, adjust the output voltage of circuit with regulation voltage, 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 in parallel 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 preferred concrete enforcement, 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 concrete enforcement, 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 concrete enforcement, 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 preferred concrete enforcement 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 and adjust circuit.Wherein, N 〉=2, the voltage-regulating circuit of each is separately positioned on the front end of a power conversion circuit, control circuit is used to detect the output voltage of each power conversion circuit, and transmit control signal to voltage-regulating circuit, adjust the output voltage of circuit with regulation voltage, 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 in parallel 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 preferred concrete enforcement, 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 described capacitor C; The other end of capacitor C is coupled to the negative pole of power supply.
In the power conversion unit of parallel connection of the present invention, 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, as soft switch circuit, half-bridge, full-bridge, circuit such as recommend.
The present invention is described by 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 features and embodiment.In addition, under instruction of the present invention, can make amendment to these features 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 is not subjected to 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 (11)
1, a kind of power conversion unit of 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, described control circuit is used to detect the output voltage of each described power conversion circuit, and transmit control signal to described voltage-regulating circuit, regulating the output voltage of described voltage-regulating circuit, thereby make each described power conversion circuit have identical output current.
2, the power conversion unit of parallel connection according to claim 1 is characterized in that, described voltage-regulating circuit is Buck circuit, Boost circuit, Buck-Boost circuit or the circuit of deriving that has added auxiliary circuit.
3, the power conversion unit of parallel connection according to claim 2 is characterized in that, the described circuit of deriving is soft switch circuit, half-bridge circuit, full-bridge circuit or push-pull circuit.
According to the power conversion unit of the arbitrary described parallel connection of claim 1～3, it is characterized in that 4, described power conversion circuit is a resonant circuit.
5, the power conversion unit of parallel connection according to claim 4, it is characterized in that, comprise first resonant circuit and second resonant circuit, be provided with first voltage-regulating circuit, be provided with second voltage-regulating circuit at the front end of second resonant circuit at the front end of first resonant circuit.
6, the power conversion unit of parallel connection according to claim 5 is characterized in that, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the described switching tube S1 positive pole, second end that are coupled to power supply is connected with the negative electrode of described diode D1 and the end, the control end that are connected to described inductance component L 1 is connected to described control circuit;
The anode of described diode D1 is coupled to the negative pole of power supply;
The other end of described inductance component L 1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2:
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected with the negative electrode of described diode D2 and the end, the control end that are connected to described inductance component L 2 is connected to described control circuit;
The anode of described diode D2 is coupled to the negative pole of power supply;
The other end of described inductance component L 2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
7, the power conversion unit of parallel connection according to claim 5 is characterized in that, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of described inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S1 are connected and are connected to the anode of described diode D1;
Second end of described switching tube S1 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, an end of described inductance component L 2 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S2 are connected and are connected to the anode of described diode D2;
Second end of described switching tube S2 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
8, the power conversion unit of parallel connection according to claim 5 is characterized in that, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, an end of described inductance component L 1 is coupled to the positive pole of power supply, and the other end and first end of described switching tube S1 are connected and are connected to the anode of described diode D1;
Second end of described switching tube S1 is coupled to the negative pole of power supply, and control end is connected to described control circuit;
The negative electrode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of inductance component L 2 is connected and is connected to described diode D2;
The anode of described diode D2 is coupled to the negative pole of power supply;
The other end of described inductance component L 2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
9, the power conversion unit of parallel connection according to claim 5 is characterized in that, described first voltage-regulating circuit comprises: switching tube S1, inductance component L 1, diode D1 and capacitor C 1;
Wherein, first end of the described switching tube S1 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L 1 is connected and is connected to described diode D1;
The other end of described inductance component L 1 is coupled to the negative pole of power supply;
The anode of described diode D1 is connected with an end of described capacitor C 1;
The other end of described capacitor C 1 is coupled to the negative pole of power supply;
Described second voltage-regulating circuit comprises: switching tube S2, inductance component L 2, diode D2 and capacitor C 2;
Wherein, first end of the described switching tube S2 positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L 2 is connected and is connected to described diode D2;
The other end of described inductance component L 2 is coupled to the negative pole of power supply;
The anode of described diode D2 is connected with an end of described capacitor C 2;
The other end of described capacitor C 2 is coupled to the negative pole of power supply.
10, the power conversion unit of parallel connection according to claim 4 is characterized in that, 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.
11, the power conversion unit of parallel connection according to claim 10 is characterized in that, described voltage-regulating circuit comprises: switching tube S, inductance component L, diode D and capacitor C;
Wherein, first end of the described switching tube S positive pole, second end that are coupled to power supply is connected to described control circuit with negative electrode, the control end that an end of described inductance component L is connected and is connected to described diode D;
The other end of described inductance component L is coupled to the negative pole of power supply;
The anode of described diode D is connected with an end of described capacitor C;
The other end of described capacitor C is coupled to the negative pole of power supply.
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| CN102638167A (en) * | 2011-02-12 | 2012-08-15 | 艾默生网络能源系统北美公司 | Parallel resonant converter circuit |
| CN102684464A (en) * | 2011-03-15 | 2012-09-19 | 雅达电子国际有限公司 | Resonant converter device and use method therefor |
| CN102762024A (en) * | 2011-04-25 | 2012-10-31 | 鸿富锦精密工业（深圳）有限公司 | Circuit board |
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