CN108233708B - Wide-range input airborne DCDC auxiliary power supply circuit - Google Patents
Wide-range input airborne DCDC auxiliary power supply circuit Download PDFInfo
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- CN108233708B CN108233708B CN201611156348.5A CN201611156348A CN108233708B CN 108233708 B CN108233708 B CN 108233708B CN 201611156348 A CN201611156348 A CN 201611156348A CN 108233708 B CN108233708 B CN 108233708B
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 title claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229920006926 PFC Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The wide-range input airborne DCDC auxiliary power supply circuit comprises a high-voltage input auxiliary power supply (1) and a low-voltage input auxiliary power supply (2), wherein the input ends of the high-voltage input auxiliary power supply (1) and the low-voltage input auxiliary power supply (2) are both whole power supply input voltage, the output voltage of the high-voltage input auxiliary power supply (1) is higher than that of the low-voltage input auxiliary power supply (2), and when the high-voltage input auxiliary power supply (1) works, the low-voltage input auxiliary power supply (2) is in a closed or stop state; the outputs of the high-voltage input auxiliary power supply (1) and the low-voltage input auxiliary power supply (2) are respectively connected through a common cathode of a diode, so that current single-phase flow can be realized.
Description
Technical Field
The invention belongs to the technical field of airborne switching power supplies.
Background
There is a wide range of input forms of power supply in on-board devices, particularly power supplies containing PFCs, which requires good adaptability of computer power supplies. Meanwhile, along with the intelligent requirement of the power supply, the functions of monitoring, sampling, communication and the like contained in the power supply also put higher requirements on an internal auxiliary power supply.
In the power supply of the airborne computer, the auxiliary power supply needs to supply power for auxiliary circuits such as a control chip, a driving circuit and a logic circuit, and is an essential part of a switching power supply. Especially, the task of the auxiliary power supply is more important because only the power supply has the functions of sampling, monitoring, communication and the like. The auxiliary power supply needs to meet the working requirements of the switching power supply under starting and full-range input voltage, output stable and reliable voltage and reduce loss as much as possible. The power supply is usually realized by adding an auxiliary winding in a main loop transformer or by applying methods such as a winding flyback circuit, a linear voltage stabilizing circuit and the like.
The method of adding windings in the main transformer can meet the requirement of the common switching power supply for the auxiliary power supply, but when the on-board DCDC is input in a wide range, the common design method has many problems. The linear circuit is simple in structure, large in loss and limited in input range; the flyback circuit has the problem that the design of a magnetic element is very difficult to realize the working conditions of power supply starting and low-voltage input by adopting an auxiliary winding method if the upper limit and the lower limit of input voltage are considered, and the problem is particularly prominent in a common buck switching power supply or a structure adopting multi-stage conversion. In summary, it is necessary to study the design technique of the auxiliary power supply in the DCDC power supply with wide input range.
The present applicant has conducted intensive studies with respect to the prior art in this field and has proposed the present proposal with respect to the solution of the above-mentioned problems of the prior art.
Disclosure of Invention
The invention aims to provide a design method of an airborne DCDC auxiliary power supply. The scheme can solve the problem of large adaptability of the input voltage variation range when the auxiliary power supply is input in a wide range, and provides an efficient and reliable design scheme.
The invention solves the technical problems through the following technical scheme:
a wide-range input airborne DCDC auxiliary power supply circuit comprises a high-voltage input auxiliary power supply 1 and a low-voltage input auxiliary power supply 2, wherein the input ends of the high-voltage input auxiliary power supply 1 and the low-voltage input auxiliary power supply 2 are both whole power supply input voltage, the output voltage of the high-voltage input auxiliary power supply 1 is higher than that of the low-voltage input auxiliary power supply 2, and the low-voltage input auxiliary power supply 2 is in a closed or stop state when the high-voltage input auxiliary power supply 1 works; the outputs of the high-voltage input auxiliary power supply 1 and the low-voltage input auxiliary power supply 2 are respectively connected through a diode common cathode, and current single-phase flow can be realized.
The low-voltage input auxiliary power supply 2 comprises a traditional voltage reduction circuit structure consisting of a switching tube V1, a diode D, an inductor L and a capacitor C; one end of the first current-limiting resistor R1 and one end of the second current-limiting resistor R2 are connected with the cathode of the voltage stabilizing diode VD, and the output end of the driving circuit 3 is connected with the other end of the first current-limiting resistor R1 which is connected with the drain of the switch tube V1, the other end of the second current-limiting resistor R2 which is connected with the grid of the switch tube V1, and the anode of the voltage stabilizing diode VD which is connected with the source of the switch tube V1; the series voltage dividing resistor Rd1 and the series voltage dividing resistor Rd2 are connected with the output voltage and the ground to acquire the output voltage, and the connection point of the voltage dividing resistor Rd1 and the voltage dividing resistor Rd2 is connected with the positive end of the comparator; the voltage reference output is connected with the negative end of the comparator; the voltage reference input and the power supply end of the comparator are both connected with output voltage to obtain working voltage; the output of the comparator is connected with the input end of the driving circuit 3; when the whole power supply input voltage reaches the driving starting voltage of the switching tube V1, the power supply automatically starts to work.
The design of the invention has the advantages that: the power supply can meet the requirement of a wide-range input system on an auxiliary power supply, and solves the problem that the parameter design of a traditional power supply such as a flyback circuit is difficult when the traditional power supply is input in a wide range; 2, the voltage reduction circuit adopts a switch circuit, so that the efficiency is superior to that of a linear power supply; the 3 voltage reduction circuit realizes control, driving and logic functions without using a PWM (pulse-width modulation) integrated control chip, and is simple and reliable.
Drawings
FIG. 1 is a schematic diagram of the overall scheme of the proposal;
fig. 2 is a circuit of fig. 1 for low voltage input of an auxiliary power supply.
Detailed Description
The embodiment of the present invention is shown in fig. 1, wherein the output voltage of the high voltage input auxiliary power supply 1 is slightly higher than the output voltage of the low voltage input auxiliary power supply 2, and when the high voltage input auxiliary power supply 1 is to be operated, the low voltage input auxiliary power supply 2 should be in a closed or stopped state, i.e. U1 is greater than U2. The output voltage commands of the two are set to different values, and the current reversal is prevented by diodes respectively.
The step-down circuit of the low-voltage input auxiliary power supply 2 is shown in fig. 2. The control circuit of the voltage reduction circuit simultaneously has the functions of output closed-loop control, driving and overvoltage locking. As can be seen from the figure, the command of the output voltage U2 is determined by the output voltage of the voltage reference and the values of the voltage dividing resistor Rd1 and the voltage dividing resistor Rd 2. The driving circuit 3 can realize closed-loop control of output and switch driving of the field effect transistor V1. When the input voltage is high, so that U1 is greater than U2, the comparator output of the control circuit 4 is high, the switch tube V1 is turned off, and the circuit will stop working. In addition, a circuit such as a main circuit diode and a voltage comparison circuit can be provided with a filter circuit such as a resistor and a capacitor to suppress spikes and jitter and keep output stable.
The design in the attached figures 1 and 2 is applied to a certain type of onboard computer intelligent power supply with 30-200V input, good effect is achieved, and the power supply works normally in the whole range.
Claims (1)
1. The wide-range input airborne DCDC auxiliary power supply circuit is characterized by comprising a high-voltage input auxiliary power supply (1) and a low-voltage input auxiliary power supply (2), wherein the input ends of the high-voltage input auxiliary power supply (1) and the low-voltage input auxiliary power supply (2) are both whole power supply input voltage, the output voltage of the high-voltage input auxiliary power supply (1) is higher than that of the low-voltage input auxiliary power supply (2), and when the high-voltage input auxiliary power supply (1) works, the low-voltage input auxiliary power supply (2) is in a closed or stop state; the outputs of the high-voltage input auxiliary power supply (1) and the low-voltage input auxiliary power supply (2) are respectively connected through a common cathode of a diode, so that current single-phase flow can be realized; the low-voltage input auxiliary power supply (2) comprises a traditional voltage reduction circuit structure consisting of a switching tube (V1), a diode (D), an inductor (L) and a capacitor (C); one end of the first current-limiting resistor (R1), one end of the second current-limiting resistor (R2) and the cathode of the voltage stabilizing diode (VD) are connected with the output end of the drive circuit (3), the other end of the first current-limiting resistor (R1) is connected with the drain electrode of the switch tube (V1), the other end of the second current-limiting resistor (R2) is connected with the grid electrode of the switch tube (V1), and the anode of the voltage stabilizing diode (VD) is connected with the source electrode of the switch tube (V1); the series-connected voltage dividing resistor (Rd1) and voltage dividing resistor (Rd2) are connected with the output voltage and the ground to acquire the output voltage, and the connection point of the voltage dividing resistor (Rd1) and the voltage dividing resistor (Rd2) is connected with the positive end of the comparator; the voltage reference output is connected with the negative end of the comparator; the voltage reference input and the power supply end of the comparator are both connected with output voltage to obtain working voltage; the output of the comparator is connected with the input end of the driving circuit (3); when the whole power input voltage reaches the driving starting voltage of the switching tube (V1), the work is automatically started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611156348.5A CN108233708B (en) | 2016-12-14 | 2016-12-14 | Wide-range input airborne DCDC auxiliary power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611156348.5A CN108233708B (en) | 2016-12-14 | 2016-12-14 | Wide-range input airborne DCDC auxiliary power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108233708A CN108233708A (en) | 2018-06-29 |
| CN108233708B true CN108233708B (en) | 2020-12-29 |
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| CN201611156348.5A Active CN108233708B (en) | 2016-12-14 | 2016-12-14 | Wide-range input airborne DCDC auxiliary power supply circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111884513B (en) | 2018-07-09 | 2021-12-03 | 华为数字能源技术有限公司 | Control circuit applied to power adapter and power adapter |
| CN109343628B (en) * | 2018-11-08 | 2021-01-19 | 深圳航天科技创新研究院 | A high-voltage linear regulator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6038154A (en) * | 1995-05-04 | 2000-03-14 | Lucent Technologies Inc. | Circuit and method for controlling a synchronous rectifier converter |
| CN1477775A (en) * | 2002-07-25 | 2004-02-25 | 株式会社理光 | Power supply method and electric source equipment capable of fast responsing input and output voltage change |
| CN102868311A (en) * | 2012-09-19 | 2013-01-09 | 华为技术有限公司 | Inverter input-stage circuit with wide voltage input range and inverter |
| CN205178873U (en) * | 2015-09-06 | 2016-04-20 | 洛阳隆盛科技有限责任公司 | High efficiency wide region direct current input circuit |
| CN105634263A (en) * | 2016-04-12 | 2016-06-01 | 上海斐讯数据通信技术有限公司 | Protection circuit self-adaptive to input voltage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6661211B1 (en) * | 2002-06-25 | 2003-12-09 | Alcatel Canada Inc. | Quick-start DC-DC converter circuit and method |
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2016
- 2016-12-14 CN CN201611156348.5A patent/CN108233708B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6038154A (en) * | 1995-05-04 | 2000-03-14 | Lucent Technologies Inc. | Circuit and method for controlling a synchronous rectifier converter |
| CN1477775A (en) * | 2002-07-25 | 2004-02-25 | 株式会社理光 | Power supply method and electric source equipment capable of fast responsing input and output voltage change |
| CN102868311A (en) * | 2012-09-19 | 2013-01-09 | 华为技术有限公司 | Inverter input-stage circuit with wide voltage input range and inverter |
| CN205178873U (en) * | 2015-09-06 | 2016-04-20 | 洛阳隆盛科技有限责任公司 | High efficiency wide region direct current input circuit |
| CN105634263A (en) * | 2016-04-12 | 2016-06-01 | 上海斐讯数据通信技术有限公司 | Protection circuit self-adaptive to input voltage |
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| CN108233708A (en) | 2018-06-29 |
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