TWM397656U - Three-phase power supply with three-phase three-level dc/dc converter - Google Patents

Three-phase power supply with three-phase three-level dc/dc converter Download PDF

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Publication number
TWM397656U
TWM397656U TW99217987U TW99217987U TWM397656U TW M397656 U TWM397656 U TW M397656U TW 99217987 U TW99217987 U TW 99217987U TW 99217987 U TW99217987 U TW 99217987U TW M397656 U TWM397656 U TW M397656U
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Taiwan
Prior art keywords
phase
voltage
dc
circuit
power switching
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TW99217987U
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Chinese (zh)
Inventor
chao-bin Zheng
zhi-hang Fang
wen-wei Zhan
Bo-Yuan Chen
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Allis Electric Co Ltd
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Priority to TW99217987U priority Critical patent/TWM397656U/en
Publication of TWM397656U publication Critical patent/TWM397656U/en

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Description

M397656 V. New description: [New technical field] [0001] This creation relates to a three-phase power supply, especially a three-phase power supply with a three-phase three-step DC/DC converter. [Prior Art] [0002] Due to the growing development of semiconductor technology, many electronic products are moving toward light, thin, short, and small trends. Traditional linear power supplies have been phased out due to the cumbersome isolation transformers and heat sinks inside, and their low efficiency. Instead, it can operate at high frequencies, and has a small size, weight:; * - : Lightweight, high efficiency and other advantages of switching source supply (switching 3P: ν:ώ£ϊ'.;«· _ power supply) » 勹―— [0003] The general switched power supply adopts traditional hard switching. When the operating frequency increases, the switching loss of the power switching element during turn-on and turn-off increases. Therefore, the problem of heat loss caused by the hard switching method not only makes the conversion efficiency lower, but also shortens the life of the switching element, and even increases the volume and cost required to install the heat sink. In addition, the non-ideal phenomenon of power crystal switching action also generates voltage and current surges, which increase the stress of circuit components and become a source of electromagnetic interference (EMI). [0004] In order to overcome the high frequency operation The problem, therefore, flexible switching (s〇ft switching) has become a technology currently used in various power electronics. Flexible switching technology can generally be divided into zero voltage switching (zero form number A0101 page 4 / total 32 page voltage switching, ZVS) and zero current switching (ZCS). The zero voltage switching is performed during the transient period in which the power switching element is to be turned on, and the voltage across the power switching element is firstly zeroed, and then the power switching element is turned on. The zero current switching is to reduce the current flowing through the power switching element to zero during the transient period in which the power switching element is to be turned on, and then turn on the power switching element. Whether it is zero voltage or zero current switching, the purpose is to achieve zero the product of the voltage across the power switching element and the current flowing through during the switching transient, reducing the switching loss of the power switching element and improving the efficiency of the circuit. To reduce noise interference caused by switching of power switching components. However, the two switching modes of flexible switching are better to switch at zero voltage during high frequency switching, because if the switch is switched at zero current, the charge stored in the internal capacitance of the switch will cause switching loss, especially at high frequencies. serious. [0005] Therefore, how to design a three-phase power supply with a three-phase three-step DC/DC converter can reduce the withstand voltage of the power switching element and apply phase shift pulse width modulation control technology to achieve zero voltage switching, Increasing the efficiency of this DC/DC converter is a major issue that the creators of this case have tried to overcome and solve. [New content] [0006] In order to achieve the above objectives, the present invention provides a three-phase power supply with a three-phase three-step DC/DC converter for receiving a DC voltage, the three-phase three-step DC/DC converter Each phase includes a full bridge switching circuit of four series switches, an isolation transformer, a rectifier circuit, and a low pass filter circuit. [0007] The full-bridge switching circuit of the four-string switch includes an upper half bridge arm and a half-bridge arm of the first form number A0101, page 5 / total 32 pages, and the upper half bridge arm has a first power switch And a second power switching element, the lower half arm has a third power switching element and a fourth power switching element to respectively switch the DC input voltage to a square wave voltage; wherein each power switching element respectively There is a diode and a parasitic capacitance in parallel with the power switching element. [0008] The isolation transformer has a secondary winding and a secondary winding, and the primary winding is electrically connected to the full bridge switching circuit to receive the square wave voltage and utilize the primary winding The turns of the secondary winding are converted to the magnitude of the square wave voltage and provide isolation protection. [0009] The rectifier circuit is electrically connected to the secondary winding of the isolation transformer to rectify an output voltage of the secondary winding of the isolation transformer. [0010] The low-pass filter circuit is electrically connected to the rectifier circuit to filter out the high-frequency harmonic component 1 of the rectified voltage outputted by the rectifier circuit and output a DC output voltage. [0011] Thereby, the withstand voltage of the power switching elements is reduced by using a third-order circuit architecture, and zero voltage switching is achieved with the power switching element through the isolation transformer to improve the efficiency of the DC/DC converter. [0012] In order to achieve the above object, the present invention provides a three-phase power supply with a three-phase three-step DC/DC converter, which receives a three-phase AC voltage, and each phase of the three-phase power supply includes one A full-bridge thyristor converter, a full-bridge rectifier, a full-bridge switching circuit of a four-string switch, an isolation transformer, a rectifier circuit, and a low-pass filter circuit. [0013] The full bridge thyristor converter includes two thyristors connected in series to convert the AC voltage to a DC voltage. Form No. A0101 Page 6 of 32 M397656 [0014] The full bridge rectifier includes two power switching elements connected in series to receive and rectify the DC voltage output by the full bridge thyristor. [0015] The full-bridge switching circuit of the four-string switch includes an upper half bridge arm and a lower half bridge arm, and the upper half bridge arm has a first power switching element and a second power switching element. The lower half arm has a third power switching element and a fourth power switching element to respectively switch the DC input voltage to a square wave voltage; wherein each power switching element has one of two parallel with the power switching element Polar body and a parasitic capacitance. [0016] The isolation transformer has a secondary winding and a secondary winding, and the primary winding is electrically connected to the full bridge switching circuit to receive the square wave voltage and utilize the primary winding The turns of the secondary winding are converted to the magnitude of the square wave voltage and provide isolation protection. [0017] The rectifier circuit is electrically connected to the secondary winding of the isolation transformer to rectify an output voltage of the secondary winding of the isolation transformer. [0018] the low-pass filter circuit is electrically connected to the rectifier circuit to filter out high-frequency harmonic components of the rectified voltage output by the rectifier circuit, and output a DC output voltage; [0019] The circuit architecture reduces the withstand voltage of the power switching elements and achieves zero voltage switching with the power switching element through the isolation transformer to improve the efficiency of the DC/DC converter. [0020] In order to further understand the techniques, means and effects of this creation in order to achieve the intended purpose, please refer to the following detailed description and drawings of the creation, and believe that the purpose, characteristics and characteristics of the creation can be obtained from A table number A0101 page 7 / page 32 is ice-in-the-box and is specifically understood, however, the drawings are provided for reference and description only, and are not intended to limit the creation. [Embodiment] [] The technical content and detailed description of this creation are described as follows: _] Please refer to the first-picture system. One of the three-phase three-stage DC/DC converters is the first one. The circuit diagram of the embodiment is additionally referred to the circuit diagram of the first embodiment of the second embodiment, which illustrates the operation principle of the three-phase 1% DC/DC converter. Each phase of the three-phase three-step DC/DC converter includes a four-series open-to-full-bridge switching circuit 3〇, an isolated M nm power, a low-pass circuit/3⁄4 a* ' ' · -V- Υυ ° .一-.......

[0023] The three-phase three-step DC/DC converter receives the __dc input voltage vdc. The DC input electric power dcit over-capacity capacitor group (not shown), the DC wheel human electric MVdc is evenly divided, that is, the 1/2Vdc voltage is respectively spanned in the full bridge switching circuit 30-upper half bridge arm (not labeled) ) with the lower half of the arm (not shown). ― Among them, the voltage-dividing capacitor group includes-upper capacitor and _lower voltage-dividing capacitor. The upper half bridge arm is connected in parallel with the upper portion (four), and includes a π 兀 兀 如 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Connected in series. The lower half arm system is connected in parallel with the lower sub (4) and includes a third power switching element such as a fourth power switch center Sa4 'and the third power switching element as with the fourth power opening form No. A0101 4Sa4 is a series connection 'its t, subscript a indicates that the full-bridge switching circuit 30 three-phase (a phase, b phase, c phase) of its order page 8 / total 32 pages! t A010J « 0 The _i β circuit 30 includes four power switching elements, respectively, the first power switching element Sal, the second power switching element Sa2, the third power switching element Sa3, and the fourth power switching element Sa4 to switch The DC voltage of the upper half arm and the lower half arm is 1⁄2 Vdc is a square wave voltage; wherein each power switching element has a diode (not labeled) in reverse parallel with the power switching element, or It is called a body diode and a parasitic capacitor (not shown). The isolation transformer 40 has a primary side winding (not shown), a secondary side winding (not shown), and a secondary side leakage inductance (not shown) in series with the primary side winding, and the primary side The winding is electrically connected to the full bridge switching circuit 30 to receive the square wave voltage, and the magnitude of the square wave voltage is converted by the turns ratio of the primary side winding and the secondary side winding. In addition, the isolation transformer 40 . , i - can provide the function of isolation between the primary side circuit and the secondary side circuit. The rectifier circuit 50 is electrically connected to the secondary winding of the isolation transformer 40 to rectify the output voltage of the secondary winding of the isolation transformer 40. The output of the secondary winding of the isolation transformer 40 is electrically connected to two parallel rectifiers (not shown) to form a full-wave rectifier circuit structure. The low-pass filter circuit 60 is electrically connected to the rectifying circuit 50 to filter out high-frequency harmonic components of the rectified voltage outputted by the rectifying circuit 50, and to provide an output voltage Vo of one of the required voltage levels of the load. The low-pass filter circuit 60 is a low-pass filter circuit composed of a filter inductor Lo and a filter capacitor Co. [0024] It is worth mentioning that the three-phase power supply of the three-phase three-step DC/DC converter has the third-order open relationship of each phase switched by the phase shift control to the upper and lower switches, and the three-phase switches of the three phases are also There is a phase separation of 1 20 degrees. And the phase form number A0101 page 9 / total 32 page shift control mode is mainly divided into phase shifting between 120 degrees and 60 degrees switching output mode. First, with the phase shift control of 120 degrees, please refer to the waveform diagram of the 12th phase shift control in the third diagram. In this description, any one of the two phases is taken as an example, and therefore, the subscript of the component symbol does not indicate the a phase, the b phase, or the c phase. As shown in FIG. 3A, a first switch S1 and a fourth switch S4 are complementarily switched, and a second switch S2 and a third switch S3 are also complementarily switched. Performing phase shift control on the second switch, moving forward by a phase shift angle $ with respect to the first switch S1, wherein the phase shift angle φ is set to be greater than 120 degrees (less > 120 degrees), and The phase shift of the three-phase switch also maintains a phase difference of 120 degrees. The phase modulation of the three phases is as shown in the third figure, 8 phases, voltage Va (relative to a neutral point voltage Vn), and a b-phase voltage Vb. And a tricky process, such that the post-stage circuit (the isolating transformer 4, the rectifying device 50 and the low-pass wave circuit 60) is processed, and the resulting rectified waveform is the first output of the third figure a As shown by the voltage Vol, the voltage pulse width of each phase voltage (eg, the a-phase voltage Va, the b-phase voltage Vb, and the c-phase voltage Vc) is adjusted by the control of the phase shift angle ' to reach the first output voltage v Output control of 〇 1. In addition, with a phase shift control of 60 degrees, please refer to the third figure b is the waveform diagram of the third-order switch with 60-degree phase shift control. The first switch 31 and the fourth The switch S4 is a complementary switch, and the second switch S2 and the third switch S3 are also complementarily switched. The switch S2 performs phase shift control 'however' its phase control is to set the phase shift angle φ to be between 6 与 and 120 degrees (120 degrees > 屮 > 60 degrees), and the three-phase switch The phase shift also maintains a phase difference of 120 degrees. The phase modulation outputs of the three phases are respectively as shown in the third figure, the a phase voltage Va 'the b phase voltage Vb and the c phase voltage Vc, and the width of each phase is greater than 60 degrees, so that the latter stage circuit (form number A0101 page 10 / total 32 pages of the isolation transformer 4 ο, 玄王机 voltage 5 〇 and the low-pass filter Ray β η η)

The modulated output voltage of the superimposed voltage. , like the first output voltage ^ 〇 1 plus . By controlling the phase shift angle 0 to adjust the output of each phase voltage (e.g., the a-phase voltage Va, the b-phase voltage Vb, and the c-phase voltage Vc), control of higher dust output can be achieved. See the graph in Figure 3 for the change in output voltage gain. By the aforementioned third-order switching phase shift control tree controlling the phase shift angle 0, the output voltage VQ gain variation can be constructed to be linear. [0026] In addition, the three-phase three-step DC/DC converter is also coupled with a feedback control circuit (not shown) to provide different phase shift control for the power components by means of phase modulation. This cycle of voltage regulation per voltage v〇. The feedback control circuit mainly includes a voltage compensation circuit (not shown), a boost/phase control modulation controller (not shown), and a switch drive unit (not shown). The voltage compensation circuit is electrically connected to the low pass filter circuit 6'' to receive the output voltage Vo' of the DC/DC converter and generate an output compensation voltage. The step-up/phase-controlled modulation controller is electrically connected to the voltage compensation circuit to receive the output compensation voltage 'and controls a duty cycle of the output square wave of the step-up/phase-controlled modulation controller according to the output compensation voltage Generates four switch drive signals per phase. The switch driving unit is electrically connected to the step-up/phase-controlled modulation controller and the full-bridge switching circuit 30 to receive the switch driving signals of the step-up/phase-controlled modulation controller, and respectively control the pair The power switching elements sa, Sa4, Sb, Sb4, and Sc4 of the full-bridge switching circuit 30 should be turned on and off. In addition, since the power switching elements have a turn-on delay and a turn-off delay, the form number A0101 page 11/32 pages M397656 is not ideal. Therefore, in order to avoid the power The switching element is short-circuited in a state of being incompletely turned on or off. Therefore, in the embodiment, the first power switching element Sal and the second power switching element Sa2, or the third power switching element Sa3 are When the fourth power switching element Sa4 is turned on and off, a delay time is provided. It is worth mentioning that the delay time is the key for the zero-voltage switching of the power switching elements Sab and Sa4. [0027] Thereby, the power switching elements Sab Sa4 are reduced by using a second-order circuit architecture

Sbl Sb4, Scl~Sc4 are pressed, and the leakage inductance (not shown) of the isolation transformer and the diodes of the power switching element Sa^Sa4 and the parasitic capacitances reach zero, % exchange. : High efficiency of the DC/DC converter.乂Γ Just in addition, see the fourth figure, which is a circuit diagram of a second preferred embodiment of the three-phase three-step DC/DC converter. Compared with the first preferred embodiment of the present invention (the first figure), the biggest difference is that the secondary side winding of the isolation transformer 4 is a γ-connected (Y connetti) architecture. Therefore, the output of the secondary winding of the isolation transformer 40 is electrically connected to two consecutive serial/VIL-poles (not labeled) to form a full-wave rectifier circuit architecture. Under this circuit architecture, the number of rectifying diodes used in the rectifier circuit 5 can be reduced by half. Moreover, the number of the filter inductors L 使用 used by the low-pass filter circuit 60 electrically connected to the rectifier circuit 5 can be reduced to one. Further, reference is made to the circuit diagram of a second preferred embodiment of the three-phase three-stage DC/DC converter of the fifth embodiment. Compared with the first preferred embodiment of the present invention (the first figure), the biggest difference is that each of the isolation transformers 4 表单 is in the form number A0101, page 12 / total 32 pages, one of the secondary side windings is electrically connected A rectifying diode (not shown) forms a half-wave rectifying circuit architecture. Under this circuit architecture, the number of rectifier diodes used in the rectifier circuit 50 can be reduced by three-quarters. Moreover, the filter inductors Lao~Leo used by the low-pass filter circuit 60 electrically connected to the rectifier circuit 50 are also connected to the rectifier diodes in series. [0030] The three-phase three-step DC/DC converter architecture described above can be applied to a three-phase power supply to form a three-phase power supply having a three-phase three-stage DC/true current converter. Referring to the sixth drawing, a circuit diagram of a first preferred embodiment of a three-phase power supply having a three-phase three-stage DC/DC converter is shown. The power supply is connected to a three-phase AC voltage Vs. Each phase of the three-phase power supply includes a full bridge thyristor converter 10, a full bridge rectifier 20, a full bridge switching circuit 30, an isolation transformer 40, a rectifier circuit 50, and a low pass. Filter circuit 60. [0031] The full bridge thyristor converter 10 includes two thyristors connected in series to convert the AC voltage Vs to a DC voltage. The full bridge rectifier 20 includes two power switching elements (not shown) connected in series to receive and rectify the DC voltage output by the full bridge thyristor 10. In addition, the output of the full bridge rectifier 20 is further electrically connected to an output capacitor group (not shown), and the output capacitor group further includes an upper output capacitor and a lower output capacitor. The full bridge switching circuit 30 includes an upper half arm (not shown) and a lower half arm (not labeled), and the upper half arm has a first power switching element Sal and a second power switch. Element Sa2, the lower half arm has a third power switching element Sa3 and a fourth power switching element Sa4 to respectively switch the DC input voltage Vdc to form number A0101 page 13 / total 32 pages M397656 - square wave voltage . Each of the power switching elements has a diode (not shown) in parallel with the power switching element, or a body diode and a parasitic capacitor (not labeled). The isolation transformer 40 has a primary side winding (not shown), a secondary side winding (not shown), and a primary side leakage inductance (not shown) in series with the primary side winding, and the primary side The winding is electrically connected to the full bridge switching circuit to receive the square wave voltage, and the magnitude of the square wave voltage is converted by a turns ratio of the primary side winding and the secondary side winding. In addition, the isolation transformer 40 provides isolation between the primary side circuit and the secondary side circuit. The rectifier circuit 5 is electrically connected to the one-side winding of the isolation transformer 4 to rectify the output voltage of the secondary winding of the isolation transformer 4 . The low-pass chopper circuit is interesting: more:;j, connected to the "rectifier circuit 5" to filter out the high-frequency harmonic component of the rectified voltage outputted by the rectifying circuit 5" and provide the required voltage level of the load An output voltage 乂〇. The low-pass filter circuit 60 is a low-pass chopper circuit composed of a filter inductor L〇 and a filter capacitor c〇. [0032] In addition, the three-phase three-step DC/DC converter is also coupled with a feedback control circuit (not shown) to provide different phase shift control for the power switching elements by means of phase modulation. The regulation voltage of the output voltage V〇 is regulated. The feedback control circuit mainly includes an electric compensation circuit (not shown), a boost/phase control modulation controller 7A, a first switch driving unit 7 0 2 and a second switch driving unit 7 The voltage compensation circuit is electrically connected to the low pass filter circuit 60 to receive the output voltage Vo of the DC/DC converter and generate an output compensation voltage. The remote boost/phase-controlled modulation controller 70 is electrically connected to the voltage compensation circuit, Form No. A0101, 14th buy/32 pages, M397656 to receive the output compensation voltage, and the boost is controlled according to the output compensation voltage. The duty cycle of the output square wave of the phase-controlled modulation controller 70 is electrically connected to the switch-drive unit 7〇2 to generate two switch drive signals per phase. In addition, the step-up/phase-control modulation controller 7 is electrically connected to the second switch driving unit 704 to generate four _ drive signals per phase. The first switch driving unit 702 is electrically connected to the boost/phase-controlled modulation controller 70 and the full-bridge rectifier 2〇 to receive the switch driving signals of the boost/phase-controlled modulation control And respectively controlling the on and off of the power switching elements corresponding to the full bridge rectifier 20. In addition, the second switch driving unit 704 is electrically connected to the boost/phase-controlled modulation controller 70 and the full-bridge switching circuit 30 to receive the boost/phase-controlled modulation controller 70. The switch driving signals respectively control the power switching elements SabSa4, Sbl~SM corresponding to the full bridge switching circuit 30,

The conduction and cutoff of Scl~Sc4. In addition, since the power switching elements have a non-ideal phenomenon of turn-on delay and turn-off delay, in order to prevent the power switching elements from being fully turned on or off. The short circuit occurs in the state. Therefore, in the embodiment, the first power switching element Sal and the second power switching element Sa2, or the third power switching element Sa3 and the fourth power switching element Sa4 are turned on. At the time of the deadline, a delay is provided. It is worth mentioning that the delay time is the key to complete the zero voltage switching of the power switching elements Sal~Sa4. [0033] Thereby, the voltage resistance of the power switching elements Sal~Sa4, Sb1~Sb4, Scl-Sc4 is reduced by the two-phase three-step DC/DC converter circuit architecture, and the isolation transformer 40 and the power switching element are transmitted through the isolation transformer 40 These form numbers of the SabSa4 A0101 page 15 / 32 M397656 diodes achieve zero voltage switching with these parasitic capacitances to improve the efficiency of the DC / DC converter. Further, referring to the seventh drawing, a circuit diagram of a second preferred embodiment of the three-phase power supply having the three-phase three-step DC/DC converter is proposed. Compared with the first preferred embodiment of the present invention (fifth figure), the biggest difference is that the secondary winding of the isolation transformer 40 is a Y-conducting architecture. Therefore, the output of the secondary winding of the isolation transformer 40 is electrically connected to the two parallel rectifier diodes (not shown) to form a full-wave rectifier circuit structure. Under this circuit architecture, the number of rectifying diodes used in the rectifying circuit 50 can be reduced by half. Moreover, the number of the chopper inductors L 使用 used by the low-pass filter circuit 60 electrically connected to the rectifier circuit 50 can also be reduced to one. [0035] In addition, referring to the eighth figure, the creation has three A circuit diagram of a third preferred embodiment of a three-phase power supply of a three-phase DC/DC converter. Compared with the first preferred embodiment of the present invention (fifth figure), the biggest difference is that one end of the secondary side winding of the isolation transformer 40 is electrically connected to a rectifying diode (not labeled), respectively. Form a half-wave rectification circuit architecture. Under this circuit architecture, the number of rectifier diodes used in the rectifier circuit 50 can be reduced by three quarters. And the filter inductors used by the low-pass filter circuit 60 electrically connected to the rectifying circuit 50

Lao ~ Leo also corresponds to the rectifier diode connected in series. [0036] In summary, the present invention has the following advantages: [0037] 1. Using a third-order circuit architecture, the withstand voltage of the power switching elements is reduced to one-half of the input voltage; Form No. A0101 Page 16 / A total of 32 pages [0038] 2, the application of phase shift pulse width modulation control technology, using the leakage inductance of the isolation transformer and the parasitic capacitance of the power switching components to generate resonance, and achieve zero voltage switching to improve the DC / DC converter Efficiency. [0039] However, the above description is only for the detailed description of the preferred embodiment of the present invention and the drawings. The features of the present invention are not limited thereto, and are not intended to limit the creation. All the scope of the creation should be as follows. The scope of the patent application shall prevail, and the embodiments of the spirit of the patent application scope and similar changes shall be included in the scope of this creation. Anyone familiar with the art may easily in the field of this creation. Any changes or modifications can be covered in the scope of the patent in this case below. BRIEF DESCRIPTION OF THE DRAWINGS [0040] The first figure is a circuit diagram of a first preferred embodiment of a three-phase three-step DC/DC converter; [0041] The second figure is the first preferred embodiment Circuit diagram of phase a; [0042] Figure 2A is a waveform diagram of a third-order switch controlled by phase shift of 12 degrees; [0043] Figure 3B is a waveform of a third-order switch controlled by phase shift of 60 degrees Figure [C4] Figure 3C is a graph of the gain variation of a round of voltage. [_] The fourth picture is a circuit diagram of the second preferred embodiment of the three-phase three-step DC/DC converter; [_] 帛 five pictures, the creation of the three-phase three-stage DC/DC converter Circuit diagram of the third preferred embodiment; _] 帛 (4) The present invention - a three-phase power supply with a three-phase three-stage DC/DC converter - a circuit diagram of the first preferred embodiment; A total of 32 pages of form number A0101 M397656 [0048] [0050] [0056] [0056] [0060] [0060] [0060] Form No. A0101 The seventh diagram is a circuit diagram of a second preferred embodiment of the three-phase power supply having a three-phase three-step DC/DC converter; and an eighth diagram A circuit diagram of a third preferred embodiment of the three-phase power supply having a three-phase three-stage DC/DC converter. [Main component symbol description]

Vdc DC voltage 30 full bridge switching circuit

Sal a phase first power switching element

Sa2 a phase second power switching element

Sa3 a phase third power switch component: one

Sa4 a phase fourth power switching element

Sbl b phase first - power switching element

Sb2 b phase second power switching element

Sb3 b phase third power switching element

Sb4 b phase fourth power switching element

Scl c phase first-power switching element

Sc2 c-phase second power switching element SC3 C-phase third power switching element Sc4 c-phase fourth power switching element 屮 phase shift angle Page 8 of 32 M397656

Va a phase voltage [0066] Vb b phase voltage [0067] Vc c phase voltage [0068] Vn neutral point voltage [0069] 40 isolation transformer [0070] 50 rectifier circuit [0071] 60 low pass filter circuit [ 0072] Lao a phase filter inductor [0073] Lbo b phase filter inductor [0074] Leo c phase filter inductor [0075] Lo filter inductor [0076] Co filter capacitor [0077] Vo output voltage [0078] Vs AC voltage [0079] 10 Full Bridge Gate Fluid Converter [0080] 20 Full Bridge Rectifier [0081] 70 Boost/Phase Control Modulation Controller [0082] 702 First Switch Drive Unit [0083] 704 Second Switch Drive Unit Form No. A0101 Page 19 of 32

Claims (1)

  1. M397656 VI. Patent application scope: 1. A three-phase power supply with a three-phase three-step DC/DC converter, which receives a DC voltage, each phase of the three-phase three-step DC/DC converter includes: The full-bridge switching circuit of the four-string switch includes an upper half bridge arm and a lower half bridge arm, and the upper half bridge arm has a first power switching element and a second power switching element, and the lower half bridge The arm system has a third power switching element and a fourth power switching element to respectively switch the DC input voltage into a square wave voltage; wherein each power switching element has a diode connected in parallel with the power switching element a parasitic capacitor; an isolating transformer having a sub-secondary; a side group is coupled to a secondary winding, and the primary winding is electrically connected to the ifc full-bridge to replace the power to receive the ... Voltage, and using the turns ratio of the primary side winding and the secondary side winding to convert the magnitude of the square wave voltage and provide isolation protection; a rectifier circuit electrically connecting the two of the isolation transformer a side winding for rectifying an output voltage of the secondary winding of the isolation transformer; and a low pass filter circuit electrically connected to the rectifier circuit to filter out high frequency harmonic components of the rectified voltage output by the rectifier circuit And outputting a direct current output voltage; thereby, a third-order circuit architecture can be constructed to reduce the withstand voltage capability of the power switching elements, and a zero voltage switching is achieved with the power switching element through the isolation transformer to improve the DC/DC conversion The efficiency of the device. 2. The three-phase power supply with a three-phase three-step DC/DC converter according to claim 1, further comprising a voltage compensation circuit electrically connected to the low-pass filter circuit to receive the 099217987 form number A0101 Page 20 of 32 0992055211-0 M397656 One of the DC/DC converters outputs voltage and generates an output compensation voltage. A boost/phase-controlled modulation controller electrically connects the voltage compensation circuit to receive The output compensates the voltage and generates four switch drive signals per phase; a switch drive unit is electrically connected to the boost/phase control modulation controller and the full bridge switching circuit to receive the boost/phase control The switch driving signals of the modulation controller respectively control on and off of the power switching elements corresponding to the full bridge switching circuit. 3. A three-phase power supply having a three-phase three-stage DC/DC converter as claimed in claim 1, wherein the rectifier circuit is a full-wave rectifier circuit. 4. A three-phase power supply having a three-phase third-order DC/DC converter as claimed in claim 1, wherein the rectifier circuit is a half-wave rectifier circuit. 5. A three-phase power supply having a three-phase third-order DC/DC converter according to claim 1, wherein the low-pass filter circuit is a low-pass filter circuit comprising a filter inductor and a filter capacitor. 6. A three-phase power supply having a three-phase three-step DC/DC converter for receiving a three-phase AC voltage, each phase of the three-phase power supply comprising a full-bridge thyristor converter Two thyristors are connected in series to convert the AC voltage into a DC voltage; a full bridge rectifier comprising two power switching elements connected in series to receive and rectify the full bridge thyristor The DC power and voltage are output; the full bridge switching circuit of the four series switch includes an upper half bridge arm and a lower half bridge arm, and the upper half bridge arm has a first power switching element and a second a power switching element, the lower half arm has a third power switch 099217987 form number A0101 page 21 / 32 page 0992055211-0 M397656 component and a fourth power switching component to respectively switch the DC input voltage into a square wave a voltage; wherein each power switching element has a diode and a parasitic capacitance in parallel with the power switching element; an isolation transformer has a primary a winding and a secondary winding, wherein the primary winding is electrically connected to the full bridge switching circuit to receive the square wave voltage, and converting the square winding ratio of the primary winding to the secondary winding a voltage of the wave and providing isolation protection; a rectifier circuit electrically connecting the secondary winding of the isolation transformer to rectify an output voltage of the secondary winding of the isolation transformer; and a low pass filter circuit Electrically connecting the rectifying circuit to filter out high frequency harmonic components of the rectified voltage output by the rectifying circuit, and outputting a direct current output voltage; thereby, a third-order circuit structure can be constructed to reduce the power switching elements Withstand voltage capability, and achieve zero voltage switching with the power switching element through the isolation transformer to improve the efficiency of the DC/DC converter. 7. The three-phase power supply with a three-phase third-order DC/DC converter according to claim 6 of the patent scope, further comprising: a voltage compensation circuit electrically connected to the low-pass filter circuit to receive the DC/ One of the DC converters outputs a voltage and generates an output compensation voltage. A boost/phase-controlled modulation controller is electrically connected to the voltage compensation circuit to receive the output compensation voltage and generate four switches per phase. a driving signal; a first switching driving unit electrically connecting the step-up/phase-controlled modulation controller and the full-bridge rectifier to receive the switch driving signals of the step-up/phase-controlled modulation controller, Controlling the turn-on and turn-off of the power switching elements corresponding to the full bridge rectifier; and 099217987 Form No. A0101 Page 22 of 32 0992055211-0 M397656 A second switch drive unit electrically connecting the boost / phase-controlled modulation controller and the full-bridge switching circuit to receive the switch driving signals of the step-up/phase-controlled modulation controller, respectively controlling the corresponding full-bridge switching circuits Turned on and off rate of the switching element. 8. A three-phase power supply having a three-phase third-order DC/DC converter as claimed in claim 6 wherein the rectifier circuit is a full-wave rectifier circuit. 9. A three-phase power supply having a three-phase third-order DC/DC converter as claimed in claim 6 wherein the rectifier circuit is a half-wave rectifier circuit. 10. A three-phase power supply having a three-phase third-order DC/DC converter according to claim 6 wherein the low-pass filter circuit is a low-pass filter circuit comprising a filter inductor and a filter capacitor. : 0992055211-0 099217987 Form Number A0101 Page 23 of 32
TW99217987U 2010-09-16 2010-09-16 Three-phase power supply with three-phase three-level dc/dc converter TWM397656U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI482408B (en) * 2012-10-29 2015-04-21 Delta Electronics Inc Power converter and method for controlling the same
TWI488421B (en) * 2013-04-03 2015-06-11 Delta Electronics Inc Dc-to-ac power conversion system and method of operating the same
TWI577123B (en) * 2015-08-31 2017-04-01 國立高雄應用科技大學 Isolated multi-level dc-dc converter and method thereof
TWI627828B (en) * 2017-03-13 2018-06-21 台達電子工業股份有限公司 Power inverter and power inverting method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI482408B (en) * 2012-10-29 2015-04-21 Delta Electronics Inc Power converter and method for controlling the same
US9231488B2 (en) 2012-10-29 2016-01-05 Delta Electronics, Inc. Power converter and method for controlling the same
TWI488421B (en) * 2013-04-03 2015-06-11 Delta Electronics Inc Dc-to-ac power conversion system and method of operating the same
TWI577123B (en) * 2015-08-31 2017-04-01 國立高雄應用科技大學 Isolated multi-level dc-dc converter and method thereof
TWI627828B (en) * 2017-03-13 2018-06-21 台達電子工業股份有限公司 Power inverter and power inverting method
US10224834B2 (en) 2017-03-13 2019-03-05 Delta Electronics, Inc. Power inverter and power inverting method

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