CN105048782A - Control circuit of high-power switching power supply - Google Patents
Control circuit of high-power switching power supply Download PDFInfo
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- CN105048782A CN105048782A CN201510480737.2A CN201510480737A CN105048782A CN 105048782 A CN105048782 A CN 105048782A CN 201510480737 A CN201510480737 A CN 201510480737A CN 105048782 A CN105048782 A CN 105048782A
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- power supply
- control unit
- encoder
- unit
- switching power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a control circuit of a high-power switching power supply. The control circuit comprises a sampling unit, a switch state selection unit, a switch state control unit and a driving unit, wherein the switch state selection unit comprises an enable control unit, an encoder, a decoder, an overflow protection unit and a coding maintain unit, the output end of the sampling unit is connected with the input end of the enable control unit, the output end of the enable control unit is connected with an input end connected with the switch state control unit sequentially through the encoder and the decoder, the output end of the switch state control unit is connected with a main circuit of the switching power supply via the driving unit, and the output end of the main circuit of the switching power supply is connected with the input end of the sampling unit. By the control circuit, harmonic component of the switching power supply is reduced, output efficiency of the switching power supply is improved, and line loss of the circuit is reduced.
Description
Technical field
The present invention relates to and belongs to switch power technology field, is specifically related to a kind of control circuit of high power switching power supply.
Background technology
Switching Power Supply is with small-sized, light weight, and the wide and high efficiency feature of input range has been widely used in and has communicated, in the field such as household electrical appliances, industrial instrument.But along with the extensive use of Switching Power Supply, more and more many harmonic currents are injected into electrical network.The generation of high order harmonic component, adds electric energy harmonic loss, reduces system power factor, produces very large harm to electrical network.It not only affects the quality of electrical network, but also has a great impact the reliability of electrical network, can cause protective relaying maloperation time serious, burns protective circuit plate, digital electric meter and other device.Therefore, the necessary harmonic reduction component of Switching Power Supply, improves power factor.
Summary of the invention
The technical problem to be solved in the present invention is to provide the switching power source control circuit of a kind of low current percent harmonic distortion, High Power Factor.
For solving the problems of the technologies described above, the present invention by the following technical solutions: comprise sampling unit, on off state selected cell, on off state control unit and driver element; Described sampling unit is connected with Switching Power Supply main circuit, in order to be obtained the voltage feedback signal of a reflection Switching Power Supply main circuit output voltage change by Switching Power Supply main circuit; Described on off state selected cell is connected with sampling unit, selects signal in order to produce an on off state according to described voltage feedback signal; Described switch control unit is connected with on off state selected cell; Described switch control unit has the switching-state information that multiple representative loads on energy intensity size on Switching Power Supply main circuit, and each switching-state information comprises specific duty cycle information and frequency information; Described switch control unit selects the switching-state information of signal behavior according on off state, exports the switch controlling signal with particular duty cycle and frequency; Described driver element is connected with described switch control unit, in order to according to the conducting of power switch in described switch controlling signal control switch electric power main circuit and shutoff, makes the voltage of the stable output of described Switching Power Supply main circuit;
Described on off state selected cell comprises enable control unit, encoder, decoder, overflow protection unit and coding holding unit, and described enable control unit is connected with described sampling unit, in order to produce an enable signal according to described voltage feedback signal; Described encoder is connected with described enable control unit, and this encoder has multiple state information, and multiple state information and multiple switching-state information one_to_one corresponding, described encoder can select output state information according to enable signal; Described decoder is connected with described encoder, in order to the described state information exported of selecting is converted on off state selection signal; Described overflow protection unit is connected with described encoder, during in order to occur overflowing at described forward-backward counter, controls forward-backward counter and keeps maximum or least count value exporting, until described forward-backward counter changes counting direction; Described coding holding unit is connected with described encoder, in order to the state of each controlled encoder is kept several switch periods, until several switch periods kept terminate or described forward-backward counter changes counting direction.
Described encoder is forward-backward counter, and described multiple state information is the count value of forward-backward counter; The described energy intensity of described multiple switching-state information representative from big to small with described count value one_to_one corresponding from small to large; Described enable signal comprises count enable signal and resets enable signal; Count enable signal is in order to control described forward-backward counter and carry out increasing progressively direction or successively decrease direction counting and count value to be exported; Reset enable signal in order to when described voltage feedback signal is less than the first reference voltage, control forward-backward counter and jump to least count value and export.
The invention has the beneficial effects as follows: the present invention not only increases Switching Power Supply delivery efficiency, reduce the line loss of circuit, and antijamming capability is strong.Delay protection is carried out to avoid misoperation when power supply instantaneous overcurrent; strengthen power source life; when the lasting overcurrent that load abnormal etc. causes; turn-off protection is carried out to power supply; and automatically power work is started after protection is held time; protection power source is not damaged all sidedly, reduces the spoilage of power supply.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of control circuit of high power switching power supply, comprises sampling unit 1, on off state selected cell, on off state control unit 2 and driver element 3; Described sampling unit 1 is connected with Switching Power Supply main circuit 5, in order to be obtained the voltage feedback signal of a reflection Switching Power Supply main circuit 5 output voltage change by Switching Power Supply main circuit 5; On off state selected cell is connected with sampling unit 1, selects signal in order to produce an on off state according to described voltage feedback signal; Switch control unit 2 is connected with on off state selected cell; Described switch control unit 2 has the switching-state information that multiple representative loads on energy intensity size on Switching Power Supply main circuit 5, each switching-state information comprises specific duty cycle information and frequency information, this switch control unit 2 selects the switching-state information of signal behavior according on off state, exports the switch controlling signal with particular duty cycle and frequency; Driver element 3 is connected with switch control unit 2, in order to according to the conducting of power switch in switch controlling signal control switch electric power main circuit 5 and shutoff, makes the voltage of the stable output of Switching Power Supply main circuit 5;
Described on off state selected cell comprises enable control unit 4, encoder 6, decoder 7, overflow protection unit 8 and coding holding unit 9, described enable control unit 4 is connected with described sampling unit, in order to produce an enable signal according to described voltage feedback signal; Described encoder 6 is connected with described enable control unit 4, and this encoder 6 has multiple state information, and multiple state information and multiple switching-state information one_to_one corresponding, described encoder 6 can select output state information according to enable signal; Described decoder 7 is connected with described encoder 6, in order to the described state information exported of selecting is converted on off state selection signal; Described overflow protection unit 8 is connected with described encoder 6, during in order to occur overflowing at described forward-backward counter, controls forward-backward counter and keeps maximum or least count value exporting, until described forward-backward counter changes counting direction; Described coding holding unit 9 is connected with described encoder 6, in order to the state of each controlled encoder 6 is kept several switch periods, until several switch periods kept terminate or described forward-backward counter changes counting direction.
In such scheme, described encoder 6 is forward-backward counter, and described multiple state information is the count value of forward-backward counter, and multiple switching-state information representative described energy intensity from big to small with count value one_to_one corresponding from small to large; Described enable signal comprises count enable signal and resets enable signal; Count enable signal is in order to control described forward-backward counter and carry out increasing progressively direction or successively decrease direction counting and count value to be exported; Reset enable signal in order to when described voltage feedback signal is less than the first reference voltage, control forward-backward counter and jump to least count value and export.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (2)
1. a control circuit for high power switching power supply, is characterized in that: comprise sampling unit, on off state selected cell, on off state control unit and driver element; Described sampling unit is connected with Switching Power Supply main circuit, in order to be obtained the voltage feedback signal of a reflection Switching Power Supply main circuit output voltage change by Switching Power Supply main circuit; Described on off state selected cell is connected with sampling unit, selects signal in order to produce an on off state according to described voltage feedback signal; Described switch control unit is connected with on off state selected cell; Described switch control unit has the switching-state information that multiple representative loads on energy intensity size on Switching Power Supply main circuit, and each switching-state information comprises specific duty cycle information and frequency information; Described switch control unit selects the switching-state information of signal behavior according on off state, exports the switch controlling signal with particular duty cycle and frequency; Described driver element is connected with described switch control unit, in order to according to the conducting of power switch in described switch controlling signal control switch electric power main circuit and shutoff, makes the voltage of the stable output of described Switching Power Supply main circuit;
Described on off state selected cell comprises enable control unit, encoder, decoder, overflow protection unit and coding holding unit, and described enable control unit is connected with described sampling unit, in order to produce an enable signal according to described voltage feedback signal; Described encoder is connected with described enable control unit, and this encoder has multiple state information, and multiple state information and multiple switching-state information one_to_one corresponding, described encoder can select output state information according to enable signal; Described decoder is connected with described encoder, in order to the described state information exported of selecting is converted on off state selection signal; Described overflow protection unit is connected with described encoder, during in order to occur overflowing at described forward-backward counter, controls forward-backward counter and keeps maximum or least count value exporting, until described forward-backward counter changes counting direction; Described coding holding unit is connected with described encoder, in order to the state of each controlled encoder is kept several switch periods, until several switch periods kept terminate or described forward-backward counter changes counting direction.
2. a kind of switching power source control circuit according to claim 1, is characterized in that: described encoder is forward-backward counter, and described multiple state information is the count value of forward-backward counter; The described energy intensity of described multiple switching-state information representative from big to small with described count value one_to_one corresponding from small to large; Described enable signal comprises count enable signal and resets enable signal; Count enable signal is in order to control described forward-backward counter and carry out increasing progressively direction or successively decrease direction counting and count value to be exported; Reset enable signal in order to when described voltage feedback signal is less than the first reference voltage, control forward-backward counter and jump to least count value and export.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510480737.2A CN105048782A (en) | 2015-08-09 | 2015-08-09 | Control circuit of high-power switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510480737.2A CN105048782A (en) | 2015-08-09 | 2015-08-09 | Control circuit of high-power switching power supply |
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| Publication Number | Publication Date |
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| CN105048782A true CN105048782A (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510480737.2A Pending CN105048782A (en) | 2015-08-09 | 2015-08-09 | Control circuit of high-power switching power supply |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201805361U (en) * | 2010-05-31 | 2011-04-20 | 比亚迪股份有限公司 | Control circuit of switching power supply and switching power supply |
| CN102315787A (en) * | 2010-06-29 | 2012-01-11 | 比亚迪股份有限公司 | Switch power supply control circuit and switch power supply |
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2015
- 2015-08-09 CN CN201510480737.2A patent/CN105048782A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201805361U (en) * | 2010-05-31 | 2011-04-20 | 比亚迪股份有限公司 | Control circuit of switching power supply and switching power supply |
| CN102315787A (en) * | 2010-06-29 | 2012-01-11 | 比亚迪股份有限公司 | Switch power supply control circuit and switch power supply |
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Application publication date: 20151111 |
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| RJ01 | Rejection of invention patent application after publication |