CN112366966B - Single-switch half-bridge electric energy converter - Google Patents
Single-switch half-bridge electric energy converter Download PDFInfo
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- CN112366966B CN112366966B CN202011296780.0A CN202011296780A CN112366966B CN 112366966 B CN112366966 B CN 112366966B CN 202011296780 A CN202011296780 A CN 202011296780A CN 112366966 B CN112366966 B CN 112366966B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
A single-switch half-bridge electric energy converter relates to the field of electric energy converters. The invention aims to solve the problems that the prior electric energy converter needs to be mutually isolated, is difficult to realize current type conversion and soft switch control and is difficult to realize active power factor conversion control and bidirectional electric energy conversion when in complementary driving. According to the single-switch half-bridge electric energy converter disclosed by the invention, one end of a switch S of the single-switch half-bridge electric energy converter is respectively connected with the cathode of a direct-current power supply, the anode of a diode D and one end of a capacitor C o2, the other end of the switch S is respectively connected with one end of an inductor L p, the cathode of the diode D and one end of the capacitor C o1, the other end of the inductor L p is respectively connected with the anode of the direct-current power supply and one end of the capacitor C o1, the other end of the capacitor C o1 is respectively connected with one primary end of an output transformer and the other end of the capacitor C o2, the other end of the capacitor C is connected with the other primary end of the output transformer, and the secondary of the output transformer is an alternating-current output end.
Description
Technical Field
The invention belongs to the field of electric energy converters.
Background
In the field of power converters, one of the most widely used power converters at present is a traditional half-bridge power converter formed by connecting an output loop between a capacitor bridge arm and a switch bridge arm, as shown in fig. 1, which is also the most classical DC/AC power converter. The traditional half-bridge electric energy converter has the following defects:
(1) The switching devices are connected in series up and down in the bridge arm structure, the connection relationship of the switching devices leads to mutual isolation during complementary driving, and the circuit structure is complex and inconvenient to control;
(2) Current type conversion is not easy to realize;
(3) Input active power factor control is not easy to realize;
(4) In some occasions, the operation has the hidden trouble of the through faults of the upper switch and the lower switch.
Although there is also a single-switch type current mode converter in the field of electric energy conversion, and has advantages of a driving function, simple and convenient control, and easy realization of current mode conversion, as shown in fig. 2. But when the method is applied to a general power grid, the defect of large current-voltage stress of a switching device exists, and the wide application of the method is limited.
The circuit structure of the two traditional electric energy converters is analyzed to have the defects, and the main reasons are caused by the connection relation and the circuit structure form of each connecting component forming the circuit structure.
In summary, the conventional half-bridge converter has the following problems in application:
1. The driving control is complex and needs to be isolated from each other.
2. Current mode conversion and soft switching control are not easily achieved.
3. Active power factor conversion control and bidirectional power conversion are not easily realized.
Disclosure of Invention
The invention aims to solve the problems that the prior electric energy converter needs to be mutually isolated, is difficult to realize current type conversion and soft switch control and is difficult to realize active power factor conversion control and bidirectional electric energy conversion when in complementary driving, and provides three single-switch half-bridge electric energy converters.
The first single-switch half-bridge power converter comprises: inductor L p, electric capacity C o1, electric capacity C o2, switch S, diode D and output transformer, the negative pole of DC power supply is connected respectively to switch S 'S one end, diode D anodal and the one end of electric capacity C o2, the one end of inductance L p is connected respectively to switch S' S the other end, the one end of electric capacity C is connected respectively to the other end of inductance L p, the anodal of DC power supply and the one end of electric capacity C o1 are connected respectively to the other end of electric capacity C o1, output transformer primary one end and the other end of electric capacity C o2 are connected respectively to the other end of electric capacity C, output transformer secondary is the alternating current output.
The second single-switch half-bridge power converter comprises: inductance L i, inductance L p, inductance L R, capacitance C i, Capacitor C o, diode D 1, diode D 2, diode D 3, switch S and resistor R LDC, One end of the switch S is respectively connected with one end of the alternating current power supply and one end of the capacitor C i, the other end of the switch S is respectively connected with one end of the inductor L p and one end of the capacitor C, one end of the inductor L i is connected with the other end of the alternating current power supply, and the other end of the inductor L i is respectively connected with the other end of the capacitor C i, the anode of the diode D 2 and the cathode of the diode D 1 are connected in parallel, the diode D 3 is connected with the two ends of the switch S in parallel, the cathode of the diode D 2 is respectively connected with the other end of the inductor L p, One end of the capacitor C o and one end of the resistor R LDC, the other end of the capacitor C is connected with one end of the inductor L R, the anode of the diode D 1 is respectively connected with the other end of the inductor L R, the other end of the capacitor C o and the other end of the resistor R LDC.
The second single-switch half-bridge power converter further includes: capacitor C r and resistance R LAC, capacitor C r connects in parallel in diode D 3 both ends, and the one end of resistance R LAC links to each other with the other end of inductance L R, and the other end of resistance R LAC links to each other with the positive pole of diode D 1, the other end of capacitor C o and the other end of resistance R LDC respectively.
The second single-switch half-bridge power converter further includes: diode D 4 and polar capacitor C o1, polar capacitor C o1 are connected in parallel at two ends of resistor R LAC, the negative electrode of polar capacitor C o1 is connected to the other end of inductor L R, diode D 4 is connected in parallel at two ends of the series structure formed by inductor L R and polar capacitor C o1, and the positive electrode of diode D 4 is connected to one end of inductor L R.
The third single-switch half-bridge power converter comprises: inductance L i, inductance L p, capacitance C b, capacitance C i, Capacitor C o1, capacitor C o2, diode D 1, diode D 2, diode D 3, Switch S, resistor R LAC and resistor R LDC, one end of switch S is connected with one end of AC power supply and one end of capacitor C i respectively, the other end of switch S is connected with one end of inductor L p and one end of capacitor C b respectively, One end of the inductor L i is connected with the other end of the alternating current power supply, the other end of the inductor L i is respectively connected with the other end of the capacitor C i, the anode of the diode D 2 and the cathode of the diode D 1, The diode D 3 is connected in parallel with the two ends of the switch S, the cathode of the diode D 2 is respectively connected with the other end of the inductor L p, one end of the capacitor C o1 and one end of the resistor R LDC, The other end of the capacitor C b is connected with one end of the resistor R LAC, the other end of the resistor R LAC is respectively connected with the other end of the capacitor C o1 and one end of the capacitor C o2, The anode of the diode D 1 is connected to the other end of the capacitor C o2 and the other end of the resistor R LDC, respectively.
The single-switch half-bridge bidirectional electric energy converter has the following beneficial effects:
1. the circuit structure is simple, and the power switch devices are few;
2. the driving control is convenient, and the current type conversion and control are easy to realize;
3. several power switching devices can be used in parallel and can be used for soft switching control;
4. the system has an autonomous evolution adaptive multi-occasion output function and a bidirectional conversion function;
5. the components forming the circuit structure are all universal electronic components, and the assembly cost and the mass organization production cost of the unit are low.
Drawings
FIG. 1 is a circuit diagram of a conventional half-bridge power converter;
FIG. 2 is a circuit diagram of a single-switch current mode converter;
Fig. 3 is a schematic circuit diagram of a single-switch half-bridge power converter according to an embodiment;
FIG. 4 is an equivalent circuit diagram of the circuit shown in FIG. 3;
FIG. 5 is a single-switch Boost half-bridge circuit diagram of the circuit evolution of FIG. 3;
FIG. 6 is a schematic diagram of a combination circuit of a conventional Boost/PFC converter and a conventional half-bridge converter;
FIGS. 7 and 8 are schematic diagrams of single-switch half-bridge circuit structures for class E operation transformation and CUK transformation, respectively, of the circuit evolution of FIG. 3;
Fig. 9 and 10 are schematic diagrams of two circuit structures of a conventional half bridge for input rectification, respectively;
Fig. 11 is a schematic circuit diagram of a single-switch half-bridge power converter according to a second embodiment;
FIG. 12 is an equivalent circuit diagram of the operating principle of the single-switch bi-directional power converter of FIG. 11;
fig. 13 is a schematic circuit diagram of a single-switch half-bridge power converter according to a third embodiment;
fig. 14, 15 and 16 are schematic circuit structures of the evolved Boost/PFC, class E half-bridge and CNK converter of fig. 11, respectively;
FIG. 17 is a schematic diagram of a typical isolated UPS system circuit configuration;
FIG. 18 is a schematic diagram of an isolated UPS system circuit constructed from primary conversion units A and B;
Fig. 19 is a schematic circuit diagram of a classical vienna high power factor converter;
fig. 20 is a schematic circuit diagram of the basic conversion unit C and the vienna converter after being integrated.
Detailed Description
The first embodiment is as follows: referring to fig. 3, the present embodiment is specifically described, comparing the two circuit structures shown in fig. 1 and fig. 2, and placing the capacitor bridge arm in the circuit shown in fig. 1 into the circuit shown in fig. 2, or replacing the upper arm switch S 2 in fig. 1 with the inductor L p in fig. 2, and the connection relationship between other components is unchanged, so that a new circuit structure is shown in fig. 3, and the equivalent circuit of the working principle is shown in fig. 4. The specific structure is as follows:
Comprising the following steps: inductance L p, capacitance C o1, capacitance C o2, switch S, diode D and output transformer,
One end of the switch S is respectively connected with the cathode of the direct current power supply, the anode of the diode D and one end of the capacitor C o2, the other end of the switch S is respectively connected with one end of the inductor L p, the cathode of the diode D and one end of the capacitor C, the other end of the inductor L p is respectively connected with the anode of the direct current power supply and one end of the capacitor C o1, the other end of the capacitor C o1 is respectively connected with one primary end of the output transformer and the other end of the capacitor C o2, the other end of the capacitor C is connected with the other primary end of the output transformer, and the secondary of the output transformer is an alternating current output end.
The capacitor C in the circuits in fig. 3 and fig. 4 is a blocking capacitor of the output circuit, and the solid and dotted lines in fig. 4 respectively represent the switching directions of the working current when the switch S is turned on and off during the operation of the circuit, that is, the output load passes through the one-time reciprocating switching current in each switching period, and the working principle of the output load circuit is basically the same as that of the traditional half-bridge, so that the DC/AC power conversion function can be realized on the output load.
Because the drive control is simplified, the single-switch half-bridge electric energy converter in the embodiment can easily realize current type conversion, and meanwhile inherits the anti-unbalance capability of the traditional half-bridge electric energy converter to direct current, and the practice proves that the midpoint of a capacitor bridge arm in the circuit is the midpoint voltage of the input voltage, so that the single-switch half-bridge electric energy converter can be used as a balance bridge in certain occasions. Another feature of this embodiment is that it can be used as an electrical energy converter platform, and the field of view needs to adaptively evolve the connection relationship between several passive components in its circuit structure, so as to adapt to the needs of multiple occasions, for example: the two diodes are respectively connected to two ends of the inductor L p to enable the circuit to have a boosting function and realize active PFC control, and the circuit becomes a Boost half-bridge, as shown in fig. 5. D 2 in fig. 5 is an isolation diode, and D 3 is a boost diode.
The combined circuit structure of a conventional Boost/PFC converter and a conventional half-bridge converter is also often seen in some demanding applications, as shown in fig. 6. But its widespread use is limited by the increased structural complexity and cost of the combined circuit. The circuit shown in fig. 5 can be a simplified version of the circuit of fig. 6 with an expanded range of applications by appropriate evolution. Similarly, the output loop of the single-switch half-bridge extension type power converter can be evolved into a single-switch half-bridge extension type power converter with the output loop being used as a platform, and the single-switch half-bridge extension type power converter is shown in fig. 7 and 8. The platform evolution function widens the application range of the single-switch half-bridge converter, and the main basis of the platform evolution can be that the single-switch half-bridge converter and the single-switch half-bridge converter have a common point in the working principle.
The structure of the embodiment is called a basic conversion unit A, and the basic conversion unit A is used as a platform, so that the connection relation of main components is changed, and the working current is suitable for input rectification. It is well known that conventional half-bridge converters also have AC/AC, i.e. input rectifying, functions, but the drawbacks that exist in practical applications have affected their widespread use. The structure of the traditional half-bridge circuit for input rectification is shown in fig. 9 and 10, and the voltage stress of each component is large except that the driving control is complex in the circuit of fig. 9; the two common switching devices in the circuit of fig. 10 have large conduction losses during input rectification.
The second embodiment is as follows: the present embodiment, in which the lower end of the switch S in the basic conversion unit a is changed to one end of the ac input and the input rectifying diode bridge arm of the end is removed, will be described in detail with reference to fig. 11 and 12; the other end of the alternating current input is connected with an LC inductance capacitance input filter network; and an LC capacitor inductance series circuit is connected to the original position of the switch S. The specific structure is shown in fig. 11, and the working principle equivalent circuit is shown in fig. 12.
Specifically, the single-switch half-bridge power converter according to the present embodiment includes: inductor L i, inductor L p, inductor L R, capacitor C i, capacitor C o, diode D 1, diode D 2, diode D 3, switch S and resistor R LDC,
One end of the switch S is respectively connected with one end of an alternating current power supply and one end of a capacitor C i, the other end of the switch S is respectively connected with one end of an inductor L p and one end of a capacitor C, one end of an inductor L i is connected with the other end of the alternating current power supply, the other end of the inductor L i is respectively connected with the other end of the capacitor C i, the positive electrode of a diode D 2 and the negative electrode of the diode D 1, the diode D 3 is connected with the two ends of the switch S in parallel, the negative electrode of the diode D 2 is respectively connected with the other end of the inductor L p, one end of a capacitor C o and one end of a resistor R LDC, the other end of the capacitor C is connected with one end of an inductor L R, and the positive electrode of the diode D 1 is respectively connected with the other end of the inductor L R, the other end of the capacitor C o and the other end of the resistor R LDC.
In fig. 12, the solid and broken lines indicate the switching direction of the operating current during the on and off periods of the switch S, respectively. The single-switch half-bridge electric energy converter of the embodiment can realize the bridge-free input active rectification function by only using one switch, and can also perform single-switch single-stage AC/AC conversion in many occasions.
The evolution functions of the single-switch half-bridge power converter according to the present embodiment with the conversion platform are shown in fig. 14, 15 and 16, which are single-switch converters each having a bridgeless input rectifying function, and are respectively: single switch Boost/PFC, class E and CNK single switch converters.
Further, as shown in fig. 15, the single-switch bidirectional power converter further includes: capacitor C r and resistance R LAC, capacitor C r connects in parallel in diode D 3 both ends, and the one end of resistance R LAC links to each other with the other end of inductance L R, and the other end of resistance R LAC links to each other with the positive pole of diode D 1, the other end of capacitor C o and the other end of resistance R LDC respectively.
Further, as shown in fig. 16, the single-switch bidirectional power converter further includes: diode D 4 and polar capacitance C o1,
The polar capacitor C o1 is connected in parallel with the two ends of the resistor R LAC, the negative electrode of the polar capacitor C o1 is connected with the other end of the inductor L R,
The diode D 4 is connected in parallel to two ends of a series structure formed by the inductance L R and the polar capacitor C o1, and the anode of the diode D 4 is connected to one end of the inductance L R.
And a third specific embodiment: referring to fig. 13, a single-switch half-bridge power converter according to the present embodiment is characterized by comprising: inductor L i, inductor L p, capacitor C b, capacitor C i, capacitor C o1, capacitor C o2, diode D 1, diode D 2, diode D 3, switch S, resistor R LAC, and resistor R LDC,
One end of the switch S is respectively connected with one end of the alternating current power supply and one end of the capacitor C i, the other end of the switch S is respectively connected with one end of the inductor L p and one end of the capacitor C b, one end of the inductor L i is connected with the other end of the alternating current power supply, The other end of the inductor L i is respectively connected with the other end of the capacitor C i, the anode of the diode D 2 and the cathode of the diode D 1, The diode D 3 is connected in parallel with the two ends of the switch S, the cathode of the diode D 2 is respectively connected with the other end of the inductor L p, one end of the capacitor C o1 and one end of the resistor R LDC, The other end of the capacitor C b is connected with one end of the resistor R LAC, the other end of the resistor R LAC is respectively connected with the other end of the capacitor C o1 and one end of the capacitor C o2, The anode of the diode D 1 is connected to the other end of the capacitor C o2 and the other end of the resistor R LDC, respectively.
The single-switch half-bridge power converter according to the second embodiment is referred to as a basic conversion unit B, and the single-switch half-bridge power converter according to the second embodiment is referred to as a basic conversion unit C. The basic conversion unit C is only more than B in bridge arm midpoint voltage, other differences are not great, the voltage stress of the power switch is the same, the function evolution can be carried out, the direct current voltage can be output to the later stage load at E-F point, and the AC load and the DC load can be simultaneously output.
The basic characteristics of the basic transformation unit B, C are as follows:
a. the circuit structure is simple, and the power switching devices are minimum.
B. the driving control is convenient, and the current type conversion and control are easy to realize.
C. It is easy to use several power switching devices in parallel and to perform soft switching control.
D. the basic transformation unit B, C has a bidirectional transformation function.
E. The components forming the circuit structure are all universal electronic components, and the assembly cost and the mass organization production cost of the unit are low.
F. The basic conversion unit C also has an imbalance resistance to direct current.
In practical operation, the single-switch bidirectional power converter described in the above two embodiments can be applied as follows:
1. in the field of medium and small power uninterruptible power supplies, which are generally composed of AC/DC converters and DC/AC converters, the circuit shown in fig. 17 is a typical isolated UPS system, and the system uses 9 power switching devices in a conventional diode bridge rectification mode.
An isolated UPS system using a basic conversion unit A, B is shown in fig. 18. As can be seen from the conventional boost+conventional half-bridge output of fig. 17, a high-voltage high-capacity electrolytic capacitor is necessarily required to be used as a direct-current load between the Boost/PFC of the front stage and the DC/AC conversion of the rear stage, and the three unreliable high-capacity electrolytic capacitors can be omitted by directly converting the input rectification of the basic conversion unit B into the AC conversion. Most importantly, 4 power switches are omitted, only 5 power switches are used, and almost half of the power switches are omitted compared with the prior art.
2. Use of a basic conversion unit C in a three-phase network
In the field of three-phase input rectification, a classical vienna high power factor converter with good functionality and practicality is shown in fig. 19. The advantages of the converter in three-phase input rectification are mainly as follows: high power conversion rate, small THD of input current, low voltage of a switching device, easy realization of high power factor control and high reliability. The defects are that: the switching devices are more, the control is complex, and the unidirectional rectification conversion is only performed.
The basic conversion unit C is compared with the circuit structure of the Vienna converter and the basic conversion unit C is fused together, so that the advantages of the basic conversion unit C can be inherited, the advantages of the basic conversion unit C can be improved, the disadvantages of the three points can be overcome, the switching devices are reduced, the control is simple, the direct conversion output function is added, the Vienna converter has the bidirectional conversion function, namely the platform evolution function and the fusion function of the basic conversion unit C, and the specific circuit is shown in fig. 20.
The fewer the number of components passed from input to load output, the higher the efficiency and the more reliable the device. The single-switch half-bridge bi-directional power converters are more known, evolved and applied in more fields, especially in industry.
Claims (4)
1. Single-switch half-bridge power converter, characterized in that it comprises: inductor L i, inductor L p, inductor L R, capacitor C i, capacitor C o, diode D 1, diode D 2, diode D 3, switch S and resistor R LDC,
One end of the switch S is respectively connected with one end of an alternating current power supply and one end of a capacitor C i, the other end of the switch S is respectively connected with one end of an inductor L p and one end of a capacitor C, one end of an inductor L i is connected with the other end of the alternating current power supply, the other end of the inductor L i is respectively connected with the other end of the capacitor C i, the positive electrode of a diode D 2 and the negative electrode of the diode D 1, the diode D 3 is connected with the two ends of the switch S in parallel, the negative electrode of the diode D 2 is respectively connected with the other end of the inductor L p, one end of a capacitor C o and one end of a resistor R LDC, the other end of the capacitor C is connected with one end of an inductor L R, and the positive electrode of the diode D 1 is respectively connected with the other end of the inductor L R, the other end of the capacitor C o and the other end of the resistor R LDC.
2. The single-switch half-bridge power converter of claim 1, further comprising: capacitor C r and resistance R LAC, capacitor C r connects in parallel in diode D 3 both ends, and the one end of resistance R LAC links to each other with the other end of inductance L R, and the other end of resistance R LAC links to each other with the positive pole of diode D 1, the other end of capacitor C o and the other end of resistance R LDC respectively.
3. The single-switch half-bridge power converter of claim 1, further comprising: diode D 4 and polar capacitance C o1,
The polar capacitor C o1 is connected in parallel with the two ends of the resistor R LAC, the negative electrode of the polar capacitor C o1 is connected with the other end of the inductor L R,
The diode D 4 is connected in parallel to two ends of a series structure formed by the inductance L R and the polar capacitor C o1, and the anode of the diode D 4 is connected to one end of the inductance L R.
4. Single-switch half-bridge power converter, characterized in that it comprises: inductor L i, inductor L p, capacitor C b, capacitor C i, capacitor C o1, capacitor C o2, diode D 1, diode D 2, diode D 3, switch S, resistor R LAC, and resistor R LDC,
One end of the switch S is respectively connected with one end of the alternating current power supply and one end of the capacitor C i, the other end of the switch S is respectively connected with one end of the inductor L p and one end of the capacitor C b, one end of the inductor L i is connected with the other end of the alternating current power supply, The other end of the inductor L i is respectively connected with the other end of the capacitor C i, the anode of the diode D 2 and the cathode of the diode D 1, The diode D 3 is connected in parallel with the two ends of the switch S, the cathode of the diode D 2 is respectively connected with the other end of the inductor L p, one end of the capacitor C o1 and one end of the resistor R LDC, The other end of the capacitor C b is connected with one end of the resistor R LAC, the other end of the resistor R LAC is respectively connected with the other end of the capacitor C o1 and one end of the capacitor C o2, The anode of the diode D 1 is connected to the other end of the capacitor C o2 and the other end of the resistor R LDC, respectively.
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| US6008589A (en) * | 1996-03-05 | 1999-12-28 | California Institute Of Technology | Single-switch, high power factor, ac-to-ac power converters |
| WO2005015716A2 (en) * | 2003-08-09 | 2005-02-17 | Astec International Limited | Soft switched zero voltage transition full bridge converter |
| CN101499732B (en) * | 2009-01-20 | 2011-05-18 | 华南理工大学 | Single stage semi-bridge AC-DC converter |
| JP5304416B2 (en) * | 2009-04-28 | 2013-10-02 | 富士電機株式会社 | Power conversion circuit |
| US8363427B2 (en) * | 2010-06-25 | 2013-01-29 | Greecon Technologies Ltd. | Bi-directional power converter with regulated output and soft switching |
| CN103401461B (en) * | 2013-07-30 | 2015-12-09 | 浙江大学 | A kind of high frequency boosting isolated inverter |
| JP2016208693A (en) * | 2015-04-23 | 2016-12-08 | 住友電気工業株式会社 | Power converter |
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| WO2017049179A1 (en) * | 2015-09-18 | 2017-03-23 | Murata Manufacturing Co., Ltd. | Converters with hold-up operation |
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