CN103078524A - Switching working frequency variable direct current power supply and control method for same - Google Patents

Switching working frequency variable direct current power supply and control method for same Download PDF

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Publication number
CN103078524A
CN103078524A CN2013100106054A CN201310010605A CN103078524A CN 103078524 A CN103078524 A CN 103078524A CN 2013100106054 A CN2013100106054 A CN 2013100106054A CN 201310010605 A CN201310010605 A CN 201310010605A CN 103078524 A CN103078524 A CN 103078524A
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CN
China
Prior art keywords
power supply
power
output
switch
circuit
Prior art date
Application number
CN2013100106054A
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Chinese (zh)
Inventor
杜贵平
Original Assignee
华南理工大学
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Application filed by 华南理工大学 filed Critical 华南理工大学
Priority to CN2013100106054A priority Critical patent/CN103078524A/en
Publication of CN103078524A publication Critical patent/CN103078524A/en

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Abstract

The invention discloses a switching working frequency variable direct current power supply and a control method for the same. The direct current power supply comprises a main power circuit, a digital control circuit and human-computer interaction equipment, wherein the digital control circuit is connected with the main power circuit and the human-computer interaction equipment respectively; the human-computer interaction equipment is used for setting and displaying output parameters of the direct current power supply; and the digital control circuit controls the output of the direct current power supply according to the output parameters of the direct current power supply, which are set by the human-computer interaction equipment, and determines the switching working frequency of the main power circuit according to the output parameters of the direct current power supply. According to the control method, different switching working frequencies are adopted for different output power of the same direct current power supply, so that problems when the same power supply outputs different power are well solved. The same direct current power supply can be well applied to different light-load and heavy-load places, and is suitable for use in industries of welding, motor driving and the like.

Description

A kind of DC power supply of switch changeable frequency and control method thereof
Technical field
The present invention relates to a kind of high frequency switch power technical field, be specifically related to a kind of DC power supply and control method thereof of switch changeable frequency.
Background technology
A lot of industry spot, such as electrochemistry, electric welding machine and Electric Machine Control industry, the power output of same DC power supply can alter a great deal as required, when smaller power is exported, can be because output duty cycle be less, reduce the continuity of output, reduce the output quality of power supply, the higher switch frequency of expectation this moment can solve problems, on the contrary when high-power output, in order to reduce the temperature rise that the power device switching loss brings and to obtain larger fan-out capability, this moment, lower switch frequency can meet the demands.The problems such as therefore, be badly in need of at present solving in the very large situation of same DC power supply exporting change of industry spot scope, output waveform poor continuity, the quality of power supply are poor when underloading, and large, the temperature rise of power device switching loss when heavy duty, power stage are undesirable.
Summary of the invention
The object of the present invention is to provide a kind of DC power supply and control method thereof of switch changeable frequency, to solve in the very large situation of same DC power supply exporting change of some industry spot scope, the problems such as output waveform poor continuity, the quality of power supply are poor when underloading, and large, the temperature rise of power device switching loss when heavy duty, power stage are undesirable.
For addressing the above problem, the invention provides following technical scheme:
A kind of DC power supply of switch changeable frequency comprises main power circuit, digital control circuit, human-computer interaction device; Described digital control circuit is connected with main power circuit, human-computer interaction device respectively; Described human-computer interaction device is used for arranging and showing the output parameter of DC power supply; Described digital control circuit is controlled the output of DC power supply according to the DC power supply output parameter that the human-computer interaction device arranges, and determines the switch frequency of main power circuit according to the DC power supply output parameter.
Described main power circuit comprises three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in turn, and three phase rectifier filter circuit input is connected with electrical network, and the output rectifier and filter output connects load.
The output parameter of described DC power supply comprises more than one in output voltage, output current, the power output.
Described digital control circuit is provided with two DC power supply power output fiducial values: relatively high power fiducial value and smaller power fiducial value; Simultaneously digital control circuit also is provided with two switch frequencies: higher switch frequency and than the low switch operating frequency.
As preferably, described digital control circuit adopts dsp processor.
The control method of the DC power supply of above-mentioned switch changeable frequency is as follows:
When just having begun to work on power, all adopts described digital control circuit the work of higher switch FREQUENCY CONTROL main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is during less than the smaller power fiducial value, and digital control circuit adopts higher switch FREQUENCY CONTROL main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is during greater than the relatively high power fiducial value, and digital control circuit adopts than low switch operating frequency control main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is between smaller power fiducial value and relatively high power fiducial value the time, and it is constant that digital control circuit is kept the switch frequency.
Described digital control circuit adopts the threshold value comparison algorithm to judge the output of switch frequency height, avoids the switch frequency translation frequent.
With respect to prior art, the beneficial effect that the present invention has is: make same DC power supply can well take into account the different application occasion of underloading, heavy duty, preferably resolve when underloading the output waveform poor continuity, the quality of power supply is poor, the problems such as large, the temperature rise of power device switching loss when heavy duty, power stage are undesirable, be suitable for welding, the industries such as motor-driven are used.
Description of drawings
The structural representation of the DC power supply of the switch changeable frequency in Fig. 1 execution mode;
Fig. 2 is the control flow chart of the DC power supply of switch changeable frequency in the execution mode.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention further is described in detail.
As shown in Figure 1, a kind of DC power supply of switch changeable frequency comprises main power circuit 101, digital control circuit 103, human-computer interaction device 102; Described digital control circuit 103 is connected with main power circuit 101, human-computer interaction device 102 respectively; Described human-computer interaction device 102 comprises display and keyboard, is used for arranging and showing the output parameter of DC power supply; Described digital control circuit 103 comprises dsp processor, DSP peripheral circuit, control the output of DC power supply according to the DC power supply output parameter that human-computer interaction device 102 arranges, and determine the switch frequency of main power circuit 101 according to the DC power supply output parameter.
Described main power circuit 101 comprises three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in turn, and three phase rectifier filter circuit input is connected with electrical network, and the output rectifier and filter output connects load.
The output parameter of described DC power supply comprises more than one in output voltage, output current, the power output.
Described digital control circuit 103 is provided with two DC power supply power output fiducial values: relatively high power fiducial value and smaller power fiducial value; Simultaneously digital control circuit also is provided with two switch frequencies: higher switch frequency and than the low switch operating frequency.
As preferably, it is core that described digital control circuit 103 adopts dsp processors, comprises DSP peripheral circuit, PWM output Drive Protecting Circuit, output voltage and current feedback circuit, fault secure circuit.
The control method of the DC power supply of above-mentioned switch changeable frequency is as follows:
Described digital control circuit 103 all adopts higher switch FREQUENCY CONTROL main power circuit 101 work when just having begun to work on power;
The DC power supply power output that arranges as described human-computer interaction device 102 is during less than the smaller power fiducial value, and digital control circuit 103 adopts higher switch FREQUENCY CONTROL main power circuit 101;
The DC power supply power output that arranges as described human-computer interaction device 102 is during greater than the relatively high power fiducial value, and digital control circuit 103 adopts than low switch operating frequency control main power circuit 101;
The DC power supply power output that arranges as described human-computer interaction device 102 is between smaller power fiducial value and relatively high power fiducial value the time, and it is constant that digital control circuit 103 is kept the switch frequency.
Described digital control circuit 103 adopts the threshold value comparison algorithm to judge the output of switch frequency height, avoids the switch frequency translation frequent.
The present invention adopts the method for a plurality of switch frequencies, on same DC power supply, for different power outputs, select different switch frequencies, preferably resolve some problems that when same power supply output different capacity, exist, poor such as: output waveform poor continuity during underloading, the quality of power supply, the problem such as large, the temperature rise of power device switching loss during heavy duty, power stage are undesirable.
Those skilled in the art can make various modifications to this specific embodiment or replenish or adopt similar mode to substitute under the prerequisite of principle of the present invention and essence, but these are changed and all fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.

Claims (6)

1. the DC power supply of a switch changeable frequency is characterized in that comprising main power circuit, digital control circuit and human-computer interaction device; Described digital control circuit is connected with main power circuit, human-computer interaction device respectively; Described human-computer interaction device is used for arranging and showing the output parameter of DC power supply; Described digital control circuit is controlled the output of DC power supply according to the DC power supply output parameter that the human-computer interaction device arranges, and determines the switch frequency of main power circuit according to the DC power supply output parameter.
2. the DC power supply of switch changeable frequency according to claim 1, it is characterized in that described main power circuit comprises three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in turn, three phase rectifier filter circuit input is connected with electrical network, and the output rectifier and filter output connects load.
3. the DC power supply of switch changeable frequency according to claim 1, the output parameter that it is characterized in that described DC power supply comprises more than one in output voltage, output current, the power output.
4. according to the DC power supply of the described switch changeable frequency of claim, it is characterized in that described digital control circuit is provided with two DC power supply power output fiducial values: relatively high power fiducial value and smaller power fiducial value; Simultaneously digital control circuit also is provided with two switch frequencies: higher switch frequency and than the low switch operating frequency.
5. be used for the control method of the DC power supply of each described switch changeable frequency of claim 1-4, it is characterized in that:
When just having begun to work on power, all adopts described digital control circuit the work of higher switch FREQUENCY CONTROL main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is during less than the smaller power fiducial value, and digital control circuit adopts higher switch FREQUENCY CONTROL main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is during greater than the relatively high power fiducial value, and digital control circuit adopts than low switch operating frequency control main power circuit;
The DC power supply power output that arranges as described human-computer interaction device is between smaller power fiducial value and relatively high power fiducial value the time, and it is constant that digital control circuit is kept the switch frequency.
6. the control method of the DC power supply of a kind of switch changeable frequency according to claim 5, it is characterized in that, described digital control circuit adopts the threshold value comparison algorithm to judge the output of switch frequency height, avoids the switch frequency translation frequent.
CN2013100106054A 2013-01-12 2013-01-12 Switching working frequency variable direct current power supply and control method for same CN103078524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013100106054A CN103078524A (en) 2013-01-12 2013-01-12 Switching working frequency variable direct current power supply and control method for same

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1961612A (en) * 2004-04-07 2007-05-09 松下电器产业株式会社 High-frequency heating device
CN101036094A (en) * 2004-02-19 2007-09-12 国际整流器公司 DC-DC regulator with switching frequency responsive to load
CN101954313A (en) * 2010-09-08 2011-01-26 上海理工大学 High-frequency high-voltage switching power supply for electric precipitation
CN102273055A (en) * 2009-01-12 2011-12-07 维斯塔斯风力系统集团公司 Reconfigurable power converter module
CN102684503A (en) * 2012-05-03 2012-09-19 香港应用科技研究院有限公司 Flyback type converter with adjustable switching frequency control and work cycle adjustment
CN102857109A (en) * 2012-08-28 2013-01-02 华南理工大学 High-power LLC (logical link control) resonant full-bridge converter based on DSP (digital signal processor)
CN203086357U (en) * 2013-01-12 2013-07-24 华南理工大学 A DC power supply with variable switching operating frequency

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101036094A (en) * 2004-02-19 2007-09-12 国际整流器公司 DC-DC regulator with switching frequency responsive to load
CN1961612A (en) * 2004-04-07 2007-05-09 松下电器产业株式会社 High-frequency heating device
CN102273055A (en) * 2009-01-12 2011-12-07 维斯塔斯风力系统集团公司 Reconfigurable power converter module
CN101954313A (en) * 2010-09-08 2011-01-26 上海理工大学 High-frequency high-voltage switching power supply for electric precipitation
CN102684503A (en) * 2012-05-03 2012-09-19 香港应用科技研究院有限公司 Flyback type converter with adjustable switching frequency control and work cycle adjustment
CN102857109A (en) * 2012-08-28 2013-01-02 华南理工大学 High-power LLC (logical link control) resonant full-bridge converter based on DSP (digital signal processor)
CN203086357U (en) * 2013-01-12 2013-07-24 华南理工大学 A DC power supply with variable switching operating frequency

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Application publication date: 20130501