CN102386776A - Main circuit with high power factor and low harmonic current for high-power switching power supply - Google Patents
Main circuit with high power factor and low harmonic current for high-power switching power supply Download PDFInfo
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- CN102386776A CN102386776A CN2011103759176A CN201110375917A CN102386776A CN 102386776 A CN102386776 A CN 102386776A CN 2011103759176 A CN2011103759176 A CN 2011103759176A CN 201110375917 A CN201110375917 A CN 201110375917A CN 102386776 A CN102386776 A CN 102386776A
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Abstract
A main circuit with high power factor and low harmonic current for a high-power switching power supply relates to the technical field of high-power switching power supplies and comprises a pwm (pulse-width modulation) three-phase full-wave rectifier connected to a power frequency triphase AC power supply end, a pulse shaping circuit and a plurality of switching power supply modules with the output ends connected in series with one another; after high-frequency rectifier filers of the switching power supply modules are connected in series, the total output voltage is the output voltage of the main circuit for the high-power switching power supply; an output current sensor is arranged at the output end of the main circuit for the high-power switching power supply; the output end of the output current sensor is connected with one input end of the pulse shaping circuit; the output voltage is in signal connection with another input end of the pulse shaping circuit; the pulse shaping circuit is further provided with a manually determined voltage/current reference value input end; two output ends of the pwm three-phase full-wave rectifier are connected to the anodal ends of high-frequency inverters of the switching power supply modules respectively; and the output ends of the pulse shaping circuit are connected to two input ends of a driver of each switching power supply module respectively. The main circuit can effectively improve power factor and reduce harmonic current.
Description
Technical field
The present invention relates to the technical field of high power switching power supply.
Background technology
Traditional high power switching power supply, for example the 40kw Switching Power Supply is by four or more the independently 10kw or the switch power module of the following power of 10kw, forms through serial or parallel connection.Each independently switch power module form by three phase full wave rectification bridge, pulse shaping circuit, driver, high-frequency inverter, high frequency transformer T and six parts of filtering high-frequency rectifier device of with the diode being main devices respectively; Each independently the operation principle of switch power module be: by each formed 540V direct voltage of three phase full wave rectification bridge independently, add to each independently the anode of the high-frequency inverter of switch power module as each anode direct voltage of the high-frequency inverter of switch power module independently.Each independently the input signal of the pulse shaping circuit of switch power module be: the benchmark value of artificial given voltage and current and by the sampling value of the electric current and voltage of this switch power module output; Both export one group of trigger impulse with certain width that phase place is different after relatively; Add to the input of the driver of this switch power module; Form two group pulses output by this driver again; Add to 4 inputs of this switch power module high-frequency inverter; Two outputs of this switch power module high-frequency inverter add to the two ends of the primary coil of this switch power module high frequency transformer T respectively; Thereby on the primary coil of this switch power module high frequency transformer T, form the positive and negative high-frequency pulse current that replaces; And being coupled to the secondary of this switch power module high frequency transformer T, the secondary output of high frequency transformer T adds to the input of this switch power module filtering high-frequency rectifier device, through this switch power module of output formation output voltage of this switch power module filtering high-frequency rectifier device.The output of these four switch power modules is carried out parallel connection or connects just obtaining a 40kw Switching Power Supply.Owing to receive the restriction of high frequency switching device power, the power of therefore general single switch power module can not be done very greatly, and general high power switching power supply all has the switch power module of several corresponding a little bit smaller power to carry out serial or parallel connection to form.
There are following two shortcomings in traditional high power switching power supply:
One, since each independently the output voltage and the output current of the switch power module of 10kw or the following power of 10kw all must carry out comparatively meticulous manual adjustment process; Otherwise can make each switch power module output voltage and electric current inconsistent, cause the inconsistent of each switch power module power output.Thisly need all to carry out meticulous manually-operated process, can make troubles to the user to each switch power module;
Two, because to adopt common be the three phase full wave rectification bridge of main devices with the diode, its power factor has only 88%, and its harmonic current that is injected into electrical network reaches 30%.
Summary of the invention
The object of the invention is to propose a kind of high power switching power supply main circuit that can effectively improve power factor (PF), reduce harmonic current.
The present invention is connected several switch power modules that pwm three-phase full wave rectifier circuit on the power frequency three-phase alternating-current supply end, pulse shaping circuit and output connect each other by one and forms; Each switch power module is made up of driver, high-frequency inverter, high frequency transformer and filtering high-frequency rectifier device respectively; The input of the high-frequency inverter of switch power module under each output end of driver is connected accordingly; The input of the high frequency transformer of switch power module under the output of each high-frequency inverter is connected accordingly; The input of the filtering high-frequency rectifier device of switch power module under the output of each high frequency transformer is connected accordingly; The output of each filtering high-frequency rectifier device forms the output voltage of each switch power module respectively; The output of said filtering high-frequency rectifier device is connected, and the total output voltage after the series connection is the output voltage of high power switching power supply main circuit; Output at said high power switching power supply main circuit is provided with the output current transducer; The output of output current transducer is connected an input of pulse shaping circuit; Output voltage signal is connected another input of pulse shaping circuit, and pulse shaping circuit also is provided with the benchmark value input of the given voltage and current of manual work; Two outputs of pwm three-phase full wave rectifier circuit are connected to the anode tap of the high-frequency inverter of each switch power module, and the output of pulse shaping circuit is connected to two inputs of the driver of each switch power module.
Operation principle of the present invention is: by a shared pwm three-phase full wave rectifier circuit; The 700V direct voltage of its output adds to the anode of the high-frequency inverter of each switch power module respectively, as the anode direct voltage of the high-frequency inverter of said switch power module.By a shared pulse shaping circuit; Its input signal is: the benchmark value of artificial given voltage and current and the output voltage of this Switching Power Supply and the sampling value of electric current; Both export one group of trigger impulse with certain width that phase place is different after relatively; Add to two inputs of the driver of each said switch power module respectively; Form two group pulses respectively by each driver again; Add to 4 inputs of the high-frequency inverter of each said switch power module respectively; The output of the high-frequency inverter of each said switch power module adds to the two ends of primary coil of the high frequency transformer of each said switch power module respectively, thereby on the primary coil of the high frequency transformer of each said switch power module, forms the positive and negative high-frequency pulse current that replaces, and is coupled to high frequency transformer secondary of each said switch power module; The secondary output end of the high frequency transformer of each said switch power module adds to the input of the filtering high-frequency rectifier device of each said switch power module respectively, forms the output voltage of the module of each said Switching Power Supply respectively through the output of the filtering high-frequency rectifier device of each said switch power module.The output voltage of this each said switch power module connected just can obtain a described high power switching power supply.
The main distinction and the superiority of the present invention and prior art are:
1, the structure of traditional type high power switching power supply is actual in the carrying out serial or parallel connection than high power switching power supply and form of several independent completions, and each Switching Power Supply all has one independently to be three phase full wave rectification bridge and one pulse shaping circuit independently of main devices with the diode.And the structure of the high power switching power supply after improving actual be by a shared high-power pwm three-phase main-frequency voltage rectifier; Its output dc voltage is 700V; Add to the anode of the high-frequency inverter of several high power switching power supply modules respectively, as the anode direct voltage of the high-frequency inverter of several high power switching power supply modules.Traditional passive three-phase full wave rectifier circuit of forming by diode, inductance, electric capacity, its power factor is 88% ~ 89%, the total harmonic current that is injected into electrical network is about 30%.And the pwm three-phase main-frequency voltage rectifier that the present invention adopts by driver, IGBT constant power device, and digital information processing system DSP form, its power factor is 99% ~ 100%, the total harmonic current that is injected into electrical network is 1.5%.This pwm commutation technique is used in the high power switching power supply, makes the power factor of high power switching power supply be increased to 99% ~ 100% by about 88% of traditional type, and the total harmonic current that is injected into electrical network reduces to 1.5% by about 30% of traditional type.
2, the structure of traditional type high power switching power supply actual by several independently more powerful switch power module form, each Switching Power Supply all has a pulse shaping circuit, each pulse shaping circuit all has an artificial input operation.The present invention has only a shared pulse shaping circuit, thereby one-man worker's input operation.Because these several than the driver of high power switching power supply module, high-frequency inverter, high frequency transformer, filtering high-frequency rectifier device etc.; All make every effort to symmetrical consistent fully from circuit parameter and process structure; Though thereby one-man worker's input operation; But can make several interlocks almost completely consistent than high power switching power supply module generation performance, these several almost completely consistent than the output voltage of high power switching power supply module with electric current, need not take current-sharing all to press measure again; Not only improved the performance and the reliability of high power switching power supply, and convenient for users.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
The structure chart that is example with a 40kw Switching Power Supply is that example further specifies technology contents of the present invention.
Embodiment
As shown in Figure 1, the present invention is provided with one and is connected four groups of 10kw switch power modules 31,32,33,34 that pwm three-phase full wave rectifier circuit 1 on the power frequency three-phase 380V AC power end, pulse shaping circuit 2 and output are connected each other.
Output at four groups of 10kw switch power modules is provided with a current sensor 4; The output of current sensor 4 is connected an input of pulse shaping circuit 2, also is provided with the benchmark value input 5 of the given voltage and current of manual work on the pulse shaping circuit 2.
10kw switch power module 31 is made up of driver 311,10kw high-frequency inverter 312, high frequency transformer 313 and 10kw filtering high-frequency rectifier device 314.The output of driver 311 is connected the input of 10kw high-frequency inverter 312, and 10kw high-frequency inverter 312 is connected with the primary side of high frequency transformer 313, and the secondary end of high frequency transformer 313 is connected with the input of 10kw filtering high-frequency rectifier device 314.
10kw switch power module 32 is made up of driver 321,10kw high-frequency inverter 322, high frequency transformer 323 and 10kw filtering high-frequency rectifier device 324.The output of driver 321 is connected the input of 10kw high-frequency inverter 322, and 10kw high-frequency inverter 322 is connected with the primary side of high frequency transformer 323, and the secondary end of high frequency transformer 323 is connected with the input of 10kw filtering high-frequency rectifier device 324.
10kw switch power module 33 is made up of driver 331,10kw high-frequency inverter 332, high frequency transformer 333 and 10kw filtering high-frequency rectifier device 334.The output of driver 331 is connected the input of 10kw high-frequency inverter 332, and 10kw high-frequency inverter 332 is connected with the primary side of high frequency transformer 333, and the secondary end of high frequency transformer 333 is connected with the input of 10kw filtering high-frequency rectifier device 334.
10kw switch power module 34 is made up of driver 341,10kw high-frequency inverter 342, high frequency transformer 343 and 10kw filtering high-frequency rectifier device 344.The output of driver 341 is connected the input of 10kw high-frequency inverter 342, and 10kw high-frequency inverter 342 is connected with the primary side of high frequency transformer 343, and the secondary end of high frequency transformer 343 is connected with the input of 10kw filtering high-frequency rectifier device 344.
Two outputs of pwm three-phase full wave rectifier circuit 1 are connected to the anode tap of 10kw high-frequency inverter 312,322,332 and 342.
The output of pulse shaping circuit 2 is connected to two inputs of driver 311,321,331 and 341.
Claims (1)
1. the high power switching power supply main circuit of high power factor low harmonic current is characterized in that: be connected several switch power modules that pwm three-phase full wave rectifier circuit on the power frequency three-phase alternating-current supply end, pulse shaping circuit and output connect each other by one and form; Each switch power module is made up of driver, high-frequency inverter, high frequency transformer and filtering high-frequency rectifier device respectively; The input of the high-frequency inverter of switch power module under each output end of driver is connected accordingly; The input of the high frequency transformer of switch power module under the output of each high-frequency inverter is connected accordingly; The input of the filtering high-frequency rectifier device of switch power module under the output of each high frequency transformer is connected accordingly; The output of each filtering high-frequency rectifier device forms the output voltage of each switch power module respectively; The output of said filtering high-frequency rectifier device is connected, and the total output voltage after the series connection is the output voltage of high power switching power supply main circuit; Output at said high power switching power supply main circuit is provided with the output current transducer; The output of output current transducer is connected an input of pulse shaping circuit; Output voltage signal is connected another input of pulse shaping circuit, and pulse shaping circuit also is provided with the benchmark value input of the given voltage and current of manual work; Two outputs of pwm three-phase full wave rectifier circuit are connected to the anode tap of the high-frequency inverter of each switch power module, and the output of pulse shaping circuit is connected to two inputs of the driver of each switch power module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103759176A CN102386776A (en) | 2011-11-23 | 2011-11-23 | Main circuit with high power factor and low harmonic current for high-power switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103759176A CN102386776A (en) | 2011-11-23 | 2011-11-23 | Main circuit with high power factor and low harmonic current for high-power switching power supply |
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| CN102386776A true CN102386776A (en) | 2012-03-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5140513A (en) * | 1990-07-31 | 1992-08-18 | Yamaha Corporation | Switching regulated DC-DC converter using variable capacity diodes in the feedback circuit |
| CN202334310U (en) * | 2011-11-23 | 2012-07-11 | 夏建中 | High-power switch power supply main circuit with high power factor and low harmonic current |
-
2011
- 2011-11-23 CN CN2011103759176A patent/CN102386776A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5140513A (en) * | 1990-07-31 | 1992-08-18 | Yamaha Corporation | Switching regulated DC-DC converter using variable capacity diodes in the feedback circuit |
| CN202334310U (en) * | 2011-11-23 | 2012-07-11 | 夏建中 | High-power switch power supply main circuit with high power factor and low harmonic current |
Non-Patent Citations (4)
| Title |
|---|
| 刘杰等: "一种基于DSP控制的高频大功率电源", 《仪器仪表用户》, no. 3, 30 June 2004 (2004-06-30), pages 20 - 22 * |
| 王生德等: "高压开关电源在X-射线探伤中的应用", 《郑州大学学报》, vol. 36, no. 4, 31 December 2004 (2004-12-31), pages 48 - 50 * |
| 韩立圣等: "高功率因数的大功率开关电镀电源研究", 《电力电子技术》, vol. 44, no. 5, 31 May 2010 (2010-05-31), pages 89 - 91 * |
| 高立颖等: "高频高压开关电源的设计和仿真", 《电源技术》, vol. 35, no. 3, 31 March 2011 (2011-03-31), pages 283 - 286 * |
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Application publication date: 20120321 |