CN104980022A - DC to DC system - Google Patents
DC to DC system Download PDFInfo
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- CN104980022A CN104980022A CN201510340503.8A CN201510340503A CN104980022A CN 104980022 A CN104980022 A CN 104980022A CN 201510340503 A CN201510340503 A CN 201510340503A CN 104980022 A CN104980022 A CN 104980022A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 239000004065 semiconductor Substances 0.000 claims description 21
- 230000000903 blocking effect Effects 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 11
- 101100388296 Arabidopsis thaliana DTX51 gene Proteins 0.000 claims description 5
- 102100038077 CD226 antigen Human genes 0.000 claims description 5
- 101000884298 Homo sapiens CD226 antigen Proteins 0.000 claims description 5
- 101000670986 Homo sapiens Symplekin Proteins 0.000 claims description 5
- 101100215626 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADP1 gene Proteins 0.000 claims description 5
- 101001129314 Dictyostelium discoideum Probable plasma membrane ATPase Proteins 0.000 claims description 2
- 101000713293 Homo sapiens Proton-coupled amino acid transporter 2 Proteins 0.000 claims description 2
- 101000713290 Homo sapiens Proton-coupled amino acid transporter 3 Proteins 0.000 claims description 2
- 102100036919 Proton-coupled amino acid transporter 2 Human genes 0.000 claims description 2
- 102100036918 Proton-coupled amino acid transporter 3 Human genes 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
Abstract
The present invention relates to the technical field of power electronics and in particular relates to a DC to DC system. The DC to DC system comprises a control unit, a power conversion unit and more than two paths of Buck circuit units, wherein more than two paths of Buck circuit units are connected in parallel, the control unit is used for outputting control signals to the Buck circuit units to drive the Buck circuit units to work in a staggering mode, and the power conversion unit provides the electricity to the control unit and each Buck circuit unit. According to the DC to DC system disclosed by the present invention, by arranging the more than two paths of Buck circuit units which are connected in parallel and the staggering work of the Buck circuit units, MOS tubes in the Buck circuit units are respectively connected at different time intervals in each period, so that the electric stress borne by each MOS tube is dramatically weakened; and meanwhile, the radiating area of the plurality of MOS tubes is multiplied compared to the radiating area of a single tube, so that heat radiation is easier.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of DC-DC system.
Background technology
Low-pressure direct circulation direct-current voltage reducing circuit, generally all adopts Buck circuit, only design one road main circuit, and structure is simple, therefore uses very universal.But a road main circuit comes with some shortcomings when output current is larger, as rectifier diode loss is comparatively large, require higher to heat dissipation design, the loss of diode simultaneously also affects overall efficiency.Owing to only having a switching tube job, switching tube conducting and produce in process circuit EMC disturb also larger, unnecessary electromagnetism Interference is brought to other electronic control module in electric automobile, therefore in actual applications, how to reduce rectifier diode heating in power module, reduce switching tube in conducting and the electromagnetism Interference by period generation, allowing the Buck circuit used in electric automobile provide better electrical characteristic and function, is the technology of a highly exploratory development.
Summary of the invention
The object of the present invention is to provide a kind of DC-DC system, avoid the problem of rectifying tube heating and electromagnetic interference, improve system effectiveness.
For realizing above object, the technical solution used in the present invention is: a kind of DC-DC system, comprise the Buck circuit unit of more than control unit, power conversion unit and two-way, Buck circuit unit more than described two-way is arranged in parallel, control unit outputs control signals to each Buck circuit unit and drives each Buck circuit unit to interlock work, and power conversion unit is control unit, each Buck circuit unit is powered.
Compared with prior art, there is following technique effect in the present invention: by arranging Buck circuit unit work and each Buck circuit unit interlocks of more than two-way in parallel, make the metal-oxide-semiconductor in Buck circuit distinguish conducting at the Different periods in each cycle, the electric power stress that each like this metal-oxide-semiconductor bears significantly reduces; Meanwhile, the area of dissipation that the area of dissipation of multiple metal-oxide-semiconductor compares single tube is multiplied, and therefore dispels the heat easier.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the circuit diagram of the input terminal voltage detecting unit of the present embodiment, Buck circuit unit, insulation blocking unit and output end voltage detecting unit;
Fig. 3 is the circuit diagram of control unit;
Fig. 4 is the circuit diagram of power conversion unit.
Embodiment
Below in conjunction with Fig. 1 to Fig. 4, the present invention is described in further detail.
Consult Fig. 1, a kind of DC-DC system, comprise control unit 10, Buck circuit unit 30 more than power conversion unit 20 and two-way, Buck circuit unit 30 more than described two-way is arranged in parallel, control unit 10 outputs control signals to each Buck circuit unit 30 and drives each Buck circuit unit 30 to interlock work, staggered work mentioned here is namely: in one-period, each Buck circuit unit 30 respectively work a period of time and the operating time sum of all Buck circuit units 30 is just in time one-period, ensureing under the prerequisite that circuit normally works like this, just can avoid single Buck circuit unit 30 continuous firing, and then avoiding metal-oxide-semiconductor, to bear electric power stress large, to generate heat large problem, make circuit more reliable.Interlocking the function of work to realize each Buck circuit unit 30, driving each Buck circuit unit 30 work or stop by arranging control unit 10 here.Power conversion unit 20 is control unit 10, each Buck circuit unit 30 is powered.
Preferably; in order to do further protection to circuit; the input of described Buck circuit unit 30, output are respectively arranged with input terminal voltage detecting unit 40, output end voltage detecting unit 60; insulation blocking unit 50 is provided with between Buck circuit unit 30 and output end voltage detecting unit 60; input, output end voltage detecting unit 40,60 detect the input of Buck circuit unit 30, output end voltage export control unit 10 to respectively, and control unit 10 is according to the start and stop of the magnitude of voltage driving isolation protected location 50 received.Input terminal voltage detecting unit 40 is set, output end voltage detecting unit 60 can detect the output voltage of circuit, output voltage in real time, and control the start and stop of insulation blocking unit 50 according to testing result, to reach the effect of protective circuit.
Consult Fig. 2, particularly, described Buck circuit unit 30 comprises chip NCP1034 and metal-oxide-semiconductor Q1, Q2, the pin VCC of chip NCP1034 is connected with+12V the voltage output end of power conversion unit 20, pin VSYNC is connected with control unit 10, pin GND ground connection, pin LDRIVE is connected with the grid of metal-oxide-semiconductor Q2, pin HDIRVE is connected with the grid of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 is as the input anode of Buck circuit unit 30, the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q1 is successively by inductance L 1, ground connection after electric capacity C1, the output head anode of a branch road as Buck circuit unit 30 is drawn between inductance L 1 and electric capacity C1.
Consult Fig. 3, Buck circuit unit 30 arranges more, and the time that each Buck circuit unit 30 works in one-period is fewer, and its longer service life, heating effect are less, but similarly, Buck circuit unit 30 increases and also makes that circuit is more complicated, cost is higher undoubtedly.In the present embodiment preferably, described Buck circuit unit 30 has two-way, control unit 10 comprises chip U3, chip U3 is the single-chip microcomputer of MC9S08 series, the VDD pin of chip U3 is connected with+5V the voltage output end of power conversion unit 20, pin VSS ground connection, and pin PTA1/ADP1, PTA0/TCLK/ADP0 of chip U3 connect the pin VSYNC of two-way Buck circuit unit 30 chips NCP1034 respectively.Two-way Buck circuit unit 30, interlocks and opens, just can avoid the deficiency that same Buck circuit unit 30 continuous firing is brought.
Preferably, consistent with stability for useful life in order to ensure two-way Buck circuit unit 50, in the present embodiment, two Buck circuit units 30 respectively work half period, and the pulse signal that now pin PTA1/ADP1, PTA0/TCLK/ADP0 output duty cycle of described chip U3 is 50%, phase 180 °, frequency are identical drives the chip NCP1034 in two-way Buck circuit unit 30 to interlock work.
Consult Fig. 2, particularly, described input terminal voltage detecting unit 40 comprises resistance R3, R4, the input anode three of one end of resistance R3, external power supply positive pole, Buck circuit unit 30 links together, other end ground connection after resistance R4 of resistance R3, draws a branch road and is connected with the pin PAT2/SDA/ADP2 of chip U3 between resistance R3, R4.Described insulation blocking unit 50 comprises relay K 1, triode Q3, the coil two ends 1,2 of relay K 1 are connected with the collector electrode of triode the Q3 ,+12V voltage output end of power conversion unit 20 respectively, the common port 3 of relay K 1 is connected with the output head anode of Buck circuit unit 30, and the tip side 4 of relay K 1 is as the output head anode of insulation blocking unit 50, the unsettled setting of tip side 5; Grounded emitter, the base stage of triode Q3 are connected with the pin BKGD/MS of chip U3.Described output end voltage detecting unit 60 comprises resistance R1, R2; tip side 4 three of one end of resistance the R1 ,+13.8V voltage output end of power conversion unit 20, insulation blocking unit 50 links together; the other end of resistance R1, by resistance R2 ground connection, is drawn a branch road and is connected with the pin PAT3/SCL/ADP3 of chip U3 between resistance R1, R2.Input terminal voltage detecting unit 40, output end voltage detecting unit 60 adopt electric resistance partial pressure, output voltage are divided into the voltage range that control unit can accept, the A/D module quantification treatment utilizing control unit to carry.Insulation blocking unit 50 carrys out the break-make of control circuit by relay K 1, and protected effect is good.
The major function of circuit is described below in detail: function one according to above-mentioned concrete circuit, the voltage of input terminal voltage detecting unit 40 testing circuit input J1, if the input voltage of J1 is lower than the particular value of setting or the particular value higher than setting, then disconnect relay K 1, disconnect the relay K 1 i.e. common port 3 of relay K 1 to be connected with tip side 5, avoid metal-oxide-semiconductor Q1, Q4 to damage, and then avoid J1 input voltage being applied to the load that output J2 damages output J2 connection; Function two, detects the voltage of input J1, if output J2 voltage provides prior to input J1 voltage, then disconnects relay K 1, in case circuit becomes reverse booster circuit; Function three, when detecting that the magnitude of voltage of input J1 is in the scope designed, exporting two-way pulse by pin PTA1/ADP1, PTA0/TCLK/ADP0 of chip U3 and driving the chip NCP1034 in two Buck circuit units 30 to interlock work respectively.
Consult Fig. 4, particularly, described power conversion unit 20 comprises power conversion chip U4, U5 and diode D1, the pin VIN of power conversion chip U5 is connected with external power supply positive pole, pin GND ground connection, the negative pole three of the pin VOUT of power conversion chip U5, the pin VIN of power conversion chip U4, diode D1 is connected, the pin GND ground connection of power conversion chip U4; Power conversion chip U5 is used for converting external power supply to+12V voltage, power conversion chip U4 is used for+12V voltage transitions to become+5V voltage, and the pin VOUT of the pin VOUT of power conversion chip U5, the positive pole of diode D1, power conversion chip U4 is connected with other unit respectively as+12V ,+13.8V ,+5V voltage output end.In order to can under input provide voltage condition, chip U3 still can monitoring output, input terminal voltage control relay K1, realize being connected with the output of power conversion chip U5 to the mode that output end voltage forms "AND" by diode D1 in the present embodiment, therefore, chip U3 also can normally can work when output J2 connects battery again, and the normal electric sequence of the system that realizes.
Claims (9)
1. a DC-DC system, it is characterized in that: the Buck circuit unit (30) comprising more than control unit (10), power conversion unit (20) and two-way, Buck circuit unit (30) more than described two-way is arranged in parallel, control unit (10) outputs control signals to each Buck circuit unit (30) and drives each Buck circuit unit (30) to interlock work, and power conversion unit (20) is control unit (10), each Buck circuit unit (30) power supply.
2. DC-DC system as claimed in claim 1, it is characterized in that: the input of described Buck circuit unit (30), output is respectively arranged with input terminal voltage detecting unit (40), output end voltage detecting unit (60), insulation blocking unit (50) is provided with between Buck circuit unit (30) and output end voltage detecting unit (60), input, output end voltage detecting unit (40, 60) input of Buck circuit unit (30) is detected respectively, output end voltage also exports control unit (10) to, control unit (10) is according to the start and stop of the magnitude of voltage driving isolation protected location (50) received.
3. DC-DC system as claimed in claim 2, is characterized in that: described Buck circuit unit (30) comprises chip NCP1034 and metal-oxide-semiconductor Q1, Q2, the pin VCC of chip NCP1034 is connected with+12V the voltage output end of power conversion unit (20), pin VSYNC is connected with control unit (10), pin GND ground connection, pin LDRIVE is connected with the grid of metal-oxide-semiconductor Q2, pin HDIRVE is connected with the grid of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 is as the input anode of Buck circuit unit (30), the source electrode of metal-oxide-semiconductor Q1 is connected with the drain electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q1 is successively by inductance L 1, ground connection after electric capacity C1, the output head anode of a branch road as Buck circuit unit (30) is drawn between inductance L 1 and electric capacity C1.
4. DC-DC system as claimed in claim 3, it is characterized in that: described Buck circuit unit (30) has two-way, control unit (10) comprises chip U3, chip U3 is the single-chip microcomputer of MC9S08 series, the VDD pin of chip U3 is connected with+5V the voltage output end of power conversion unit (20), pin VSS ground connection, and pin PTA1/ADP1, PTA0/TCLK/ADP0 of chip U3 connect the pin VSYNC of two-way Buck circuit unit (30) chips NCP1034 respectively.
5. DC-DC system as claimed in claim 4, is characterized in that: the pulse signal that pin PTA1/ADP1, PTA0/TCLK/ADP0 output duty cycle of described chip U3 is 50%, phase 180 °, frequency are identical drives the chip NCP1034 in two-way Buck circuit unit (30) to interlock work.
6. DC-DC system as claimed in claim 4, it is characterized in that: described input terminal voltage detecting unit (40) comprises resistance R3, R4, the input anode three of one end of resistance R3, external power supply positive pole, Buck circuit unit (30) links together, other end ground connection after resistance R4 of resistance R3, draws a branch road and is connected with the pin PAT2/SDA/ADP2 of chip U3 between resistance R3, R4.
7. DC-DC system as claimed in claim 4, it is characterized in that: described insulation blocking unit (50) comprises relay K 1, triode Q3, the coil two ends 1,2 of relay K 1 are connected with the collector electrode of triode the Q3 ,+12V voltage output end of power conversion unit (20) respectively, the common port 3 of relay K 1 is connected with the output head anode of Buck circuit unit (30), and the tip side 4 of relay K 1 is as the output head anode of insulation blocking unit (50), the unsettled setting of tip side 5; Grounded emitter, the base stage of triode Q3 are connected with the pin BKGD/MS of chip U3.
8. DC-DC system as claimed in claim 7; it is characterized in that: described output end voltage detecting unit (60) comprises resistance R1, R2; tip side 4 three of one end of resistance the R1 ,+13.8V voltage output end of power conversion unit (20), insulation blocking unit (50) links together; the other end of resistance R1, by resistance R2 ground connection, is drawn a branch road and is connected with the pin PAT3/SCL/ADP3 of chip U3 between resistance R1, R2.
9. the DC-DC system as described in any one of claim 1-8, it is characterized in that: described power conversion unit (20) comprises power conversion chip U4, U5 and diode D1, the pin VIN of power conversion chip U5 is connected with external power supply positive pole, pin GND ground connection, the negative pole three of the pin VOUT of power conversion chip U5, the pin VIN of power conversion chip U4, diode D1 is connected, the pin GND ground connection of power conversion chip U4; Power conversion chip U5 is used for converting external power supply to+12V voltage, power conversion chip U4 is used for+12V voltage transitions to become+5V voltage, and the pin VOUT of the pin VOUT of power conversion chip U5, the positive pole of diode D1, power conversion chip U4 is connected with other unit respectively as+12V ,+13.8V ,+5V voltage output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510340503.8A CN104980022A (en) | 2015-06-18 | 2015-06-18 | DC to DC system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510340503.8A CN104980022A (en) | 2015-06-18 | 2015-06-18 | DC to DC system |
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| CN104980022A true CN104980022A (en) | 2015-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510340503.8A Pending CN104980022A (en) | 2015-06-18 | 2015-06-18 | DC to DC system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102057558A (en) * | 2008-06-05 | 2011-05-11 | 阿塞里克股份有限公司 | A display device |
| CN103501115A (en) * | 2013-10-15 | 2014-01-08 | 扬州瑞控汽车电子有限公司 | Interleaved and parallel working direct-current (DC) step-down circuit |
| US20140266011A1 (en) * | 2013-03-15 | 2014-09-18 | Qualcomm Incorporated | Multiphase charger |
| CN203872056U (en) * | 2014-05-06 | 2014-10-08 | 中国电子科技集团公司第四十一研究所 | Direct-current power supply controlled by constant power |
-
2015
- 2015-06-18 CN CN201510340503.8A patent/CN104980022A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102057558A (en) * | 2008-06-05 | 2011-05-11 | 阿塞里克股份有限公司 | A display device |
| US20140266011A1 (en) * | 2013-03-15 | 2014-09-18 | Qualcomm Incorporated | Multiphase charger |
| CN103501115A (en) * | 2013-10-15 | 2014-01-08 | 扬州瑞控汽车电子有限公司 | Interleaved and parallel working direct-current (DC) step-down circuit |
| CN203872056U (en) * | 2014-05-06 | 2014-10-08 | 中国电子科技集团公司第四十一研究所 | Direct-current power supply controlled by constant power |
Non-Patent Citations (1)
| Title |
|---|
| 王培等: "小型稳压电源保护提示电路", 《电子制作》 * |
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Application publication date: 20151014 |