CN111092550B - Multi-path non-isolated DC/DC input open-circuit discharge control method - Google Patents
Multi-path non-isolated DC/DC input open-circuit discharge control method Download PDFInfo
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- CN111092550B CN111092550B CN201911353517.8A CN201911353517A CN111092550B CN 111092550 B CN111092550 B CN 111092550B CN 201911353517 A CN201911353517 A CN 201911353517A CN 111092550 B CN111092550 B CN 111092550B
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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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
Abstract
The invention relates to a multipath non-isolated DC/DC input open-circuit discharge control method, which is applied to a DC/DC device with multipath parallel non-isolated DC/DC circuits, and comprises the following steps: presetting calculation time T0, calculating the average value of the input voltage of each DC/DC circuit respectively every time a period of calculation time T0 passes, if the average value of the input voltage of one DC/DC circuit is less than or equal to a first voltage value V1, closing the drive of the DC/DC circuit, if the average value of the input voltage of one DC/DC circuit is less than a second voltage value V2 and is less than the first voltage value V1, controlling the DC/DC circuit to discharge capacitance, and if the average value of the input voltage of one DC/DC circuit is more than or equal to the second voltage value V2, controlling the DC/DC circuit to normally operate. The invention can ensure the safety of the DC/DC device, has no additional loss and is beneficial to improving the efficiency of the DC/DC device.
Description
Technical Field
The invention belongs to the technical field of power electronics and power supplies, and particularly relates to a control method adopted in a DC/DC device with a multi-path parallel non-isolated DC/DC circuit.
Background
At present, a multi-path parallel connection mode is mostly adopted for non-isolated DC/DC input, and in practical application, the condition that a certain path or a plurality of paths of DC/DC cannot be used and input is open-circuited may exist, and the condition that leakage currents of a switching device (such as a Boost diode) and a Y capacitor in a non-isolated DC/DC circuit can cause the open-circuited DC/DC power supply input capacitor to be slowly charged to a higher voltage by other paths of DC input or a DC bus can occur. To avoid this problem, it is common practice to add discharge resistors to all non-isolated DC/DC circuits, which will solve this problem but will increase extra loss, affecting the overall conversion efficiency; there are also many manufacturers that do not perform any processing, which, although not increasing the loss, will result in a higher voltage on the input capacitor of the open-circuit DC/DC power supply, which not only has a safety hazard but also affects the customer experience.
Disclosure of Invention
The invention aims to provide a multipath non-isolated DC/DC input open-circuit discharge control method which can avoid potential safety hazards caused by higher voltage on a DC/DC input capacitor, avoid additional loss and improve efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multipath non-isolated DC/DC input open-circuit discharge control method is applied to a DC/DC device with multipath parallel non-isolated DC/DC circuits, and comprises the following steps: the method comprises the steps of presetting calculation time T0, calculating the average value of input voltage of each DC/DC circuit respectively every time a period of calculation time T0 passes, if the average value of the input voltage of one DC/DC circuit is less than or equal to a first voltage value V1, closing the drive of the DC/DC circuit, if the first voltage value V1 is less than or equal to the average value of the input voltage of one DC/DC circuit and is less than a second voltage value V2, controlling the DC/DC circuit to discharge capacitance, and if the average value of the input voltage of one DC/DC circuit is more than or equal to the second voltage value V2, controlling the DC/DC circuit to normally operate.
Preferably, when the first voltage value V1 is less than or equal to one input voltage average value of the DC/DC circuit < the second voltage value V2, the driving period of the DC/DC circuit is controlled to a% of the switching period of the switching tube, so as to control the DC/DC circuit to perform capacitance discharge.
Preferably, a < 1.
Preferably, a = 0.5.
Preferably, a normal mode control flag and a discharge operation mode control flag are configured for each of the DC/DC circuits respectively; when the average value of the input voltage of one DC/DC circuit is less than or equal to the first voltage value V1, the normal mode control flag and the discharging operation mode control flag of the DC/DC circuit are both set to 0, when the average value of the input voltage of one DC/DC circuit is less than the second voltage value V2, the normal mode control flag and the discharging operation mode control flag of the DC/DC circuit are both set to 0 and 1, and when the average value of the input voltage of one DC/DC circuit is greater than or equal to the second voltage value V2, the normal mode control flag and the discharging operation mode control flag of the DC/DC circuit are both set to 0.
Preferably, when the preset interrupt time is up, based on the normal mode control flag and the discharging operation mode control flag of each of the DC/DC circuits, each of the DC/DC circuits is switched or kept in its operation state.
Preferably, when the DC/DC device is powered on, the normal mode control flag and the discharging operation mode control flag of each of the DC/DC circuits are both initialized to 0.
Preferably, the multipath non-isolated DC/DC input open-circuit discharge control method is implemented by an MCU of the DC/DC device.
Preferably, the DC/DC circuit is a Boost circuit or a Buck circuit.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can ensure the safety of the DC/DC device, has no additional loss and is beneficial to improving the efficiency of the DC/DC device.
Drawings
FIG. 1 is a circuit diagram of a DC/DC device having multiple parallel non-isolated DC/DC circuits.
FIG. 2 is a flow chart of the open circuit discharge control method for the multi-path non-isolated DC/DC input of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: the DC/DC device shown in fig. 1 includes n parallel non-isolated DC/DC circuits, where the DC/DC circuits are Boost circuits or Buck circuits, and the Boost circuits are shown in the figure, and each of the Boost circuits includes a switching tube. In each DC/DC circuit, Cn1 and Cn2 are input Y capacitors, Ln is a Boost inductor, Cin is an input capacitor name Qn is a Boost switching tube, and Dn is a Boost output diode. In the state shown in the figure, the first route of Boost is connected with a DC source, and other routes of Boost are open-circuited. The DC/DC device also comprises an MCU for controlling each DC/DC circuit.
As shown in fig. 2, in the DC/DC apparatus, a multipath non-isolated DC/DC input open-circuit discharge control method is adopted: and presetting a calculation time T0, calculating the input voltage average value Vdc [ n ] of each DC/DC circuit after a calculation time T0, and then judging the range of the input voltage average value Vdc [ n ] of each DC/DC circuit. If the average value of the input voltage of one DC/DC circuit is less than or equal to a first voltage value V1 (for example, 30V), the driving of the DC/DC circuit is closed; if the first voltage value V1 is less than or equal to the average value of the input voltage of one DC/DC circuit and less than the second voltage value V2 (for example, the lowest voltage in normal operation), controlling the DC/DC circuit to discharge the capacitor; and if the average value of the input voltage of one DC/DC circuit is larger than or equal to the second voltage value V2, controlling the DC/DC circuit to normally operate.
For the condition that the first voltage value V1 is not less than the average value of the input voltage of one DC/DC circuit is less than the second voltage value V2, the driving period of the DC/DC circuit can be controlled to be a% of the switching period of the switching tube, so that the DC/DC circuit can be controlled to carry out capacitance discharge. The value of a is small, and generally a < 1, in the embodiment, a = 0.5.
In implementing the above method, a normal mode control flag NormalFlag [ n ] and a discharging operation mode control flag discargeflag [ n ] may be configured for each of the DC/DC circuits. When the DC/DC device is powered on, the normal mode control flag NormalFlag [ n ] and the discharging operation mode control flag DisChargeFlag [ n ] of each DC/DC circuit are initialized to 0. When the average value of the input voltage of one DC/DC circuit is less than or equal to the first voltage value V1, the normal mode control flag NormalFlag [ n ] and the discharging working mode control flag DisChargeFlag [ n ] of the DC/DC circuit are both set to 0, when the first voltage value V1 is less than or equal to the average value of the input voltage of one DC/DC circuit is less than the second voltage value V2, the normal mode control flag NormalFlag [ n ] and the discharging working mode control flag DisChargeFlag [ n ] of the DC/DC circuit are set to 0 and 1, and when the average value of the input voltage of one DC/DC circuit is more than or equal to the second voltage value V2, the normal mode control flag NormalFlag [ n ] and the discharging working mode control flag DisChargeFlag [ n ] of the DC/DC circuit are set to 1 and 0.
After the DC/DC circuit is electrified, when the preset interrupt time is up, each DC/DC circuit is switched or kept in the working state based on the normal mode control flag NormalFlag [ n ] and the discharging working mode control flag DisChargeFlag [ n ] of each DC/DC circuit. If the NormalFlag [ n ] =1, the DC/DC circuit is kept or switched to a normal operation mode (such as a voltage control loop, a current control loop, a power control loop and the like); if DisChargeFlag [ n ] =1, the DC/DC circuit of the circuit is kept or switched to a capacitor discharge mode, and the circuit is realized by controlling a switching tube of the circuit to work in a very small drive; otherwise, the input voltage of the DC/DC circuit is lower than V1, and the drive is closed.
The multipath non-isolated DC/DC input open-circuit discharge control method is implemented by an MCU of the DC/DC device and is controlled only by software. According to the control mode, the voltage of the open-circuit DCn is always kept below the voltage of V1, so that safety is guaranteed, and no discharge resistor is added to increase the loss of the machine additionally.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A multipath non-isolated DC/DC input open-circuit discharge control method is applied to a DC/DC device with multipath output parallel non-isolated DC/DC circuits, and is characterized in that: the multipath non-isolated DC/DC input open-circuit discharge control method comprises the following steps: presetting calculation time T0, calculating the average value of the input voltage of each DC/DC circuit respectively every time a period of calculation time T0 passes, if the average value of the input voltage of one DC/DC circuit is less than or equal to a first voltage value V1, closing the drive of the DC/DC circuit, if the first voltage value V1 is less than the average value of the input voltage of one DC/DC circuit and less than a second voltage value V2, controlling the DC/DC circuit to discharge capacitance, and if the average value of the input voltage of one DC/DC circuit is more than or equal to the second voltage value V2, controlling the DC/DC circuit to normally operate;
when the first voltage value V1 is less than the average value of the input voltage of one DC/DC circuit is less than the second voltage value V2, the driving period of the DC/DC circuit is controlled to be a% of the switching period of a switching tube, so that the DC/DC circuit is controlled to carry out capacitance discharge, and a is less than 1.
2. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 1, wherein: a = 0.5.
3. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 1, wherein: configuring a normal mode control mark and a discharge working mode control mark for each DC/DC circuit respectively; when the average value of the input voltage of one DC/DC circuit is less than or equal to the first voltage value V1, setting the normal mode control flag and the discharge operation mode control flag of the DC/DC circuit to 0, when the average value of the input voltage of the DC/DC circuit is less than the second voltage value V2 and is less than the first voltage value V1, setting the normal mode control flag and the discharge operation mode control flag of the DC/DC circuit to 0 and 1, and when the average value of the input voltage of the DC/DC circuit is more than or equal to the second voltage value V2, setting the normal mode control flag and the discharge operation mode control flag of the DC/DC circuit to 0.
4. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 3, wherein: and when the preset interrupt time is up, switching or keeping the working state of each DC/DC circuit based on the normal mode control mark and the discharge working mode control mark of each DC/DC circuit.
5. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 3, wherein: and when the DC/DC device is electrified, the normal mode control flag and the discharge working mode control flag of each DC/DC circuit are initialized to 0.
6. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 1, wherein: the multipath non-isolated DC/DC input open-circuit discharge control method is implemented by an MCU of the DC/DC device.
7. The method for controlling open-circuit discharge of multiple non-isolated DC/DC inputs according to claim 1, wherein: the DC/DC circuit is a Boost circuit or a Buck circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911353517.8A CN111092550B (en) | 2019-12-25 | 2019-12-25 | Multi-path non-isolated DC/DC input open-circuit discharge control method |
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| CN201911353517.8A CN111092550B (en) | 2019-12-25 | 2019-12-25 | Multi-path non-isolated DC/DC input open-circuit discharge control method |
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| CN111092550A CN111092550A (en) | 2020-05-01 |
| CN111092550B true CN111092550B (en) | 2022-01-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120262955A1 (en) * | 2009-02-27 | 2012-10-18 | Delta Electronics (Shanghai) Co., Ltd. | Converter with input voltage balance circuit |
| CN103441666A (en) * | 2013-07-25 | 2013-12-11 | 广州金升阳科技有限公司 | Power supply device achieving input-series and output-parallel of switching power supply |
| CN104022634A (en) * | 2014-06-30 | 2014-09-03 | 中国电子科技集团公司第四十三研究所 | Energy-storage capacitor type high-voltage and low-voltage surge suppression circuit and suppression method thereof |
| CN105372552A (en) * | 2015-12-10 | 2016-03-02 | 南京康尼电子科技有限公司 | Load open circuit detection circuit and method for high-side switch |
| CN109861532A (en) * | 2019-03-01 | 2019-06-07 | 中国第一汽车股份有限公司 | A kind of DC/DC converter and the control method of finished based on it |
-
2019
- 2019-12-25 CN CN201911353517.8A patent/CN111092550B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120262955A1 (en) * | 2009-02-27 | 2012-10-18 | Delta Electronics (Shanghai) Co., Ltd. | Converter with input voltage balance circuit |
| CN103441666A (en) * | 2013-07-25 | 2013-12-11 | 广州金升阳科技有限公司 | Power supply device achieving input-series and output-parallel of switching power supply |
| CN104022634A (en) * | 2014-06-30 | 2014-09-03 | 中国电子科技集团公司第四十三研究所 | Energy-storage capacitor type high-voltage and low-voltage surge suppression circuit and suppression method thereof |
| CN105372552A (en) * | 2015-12-10 | 2016-03-02 | 南京康尼电子科技有限公司 | Load open circuit detection circuit and method for high-side switch |
| CN109861532A (en) * | 2019-03-01 | 2019-06-07 | 中国第一汽车股份有限公司 | A kind of DC/DC converter and the control method of finished based on it |
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| CN111092550A (en) | 2020-05-01 |
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Address after: 242200 No.208, Tongxi East Road, Guangde Economic Development Zone, Xuancheng City, Anhui Province Applicant after: GOODWE POWER SUPPLY TECHNOLOGY (GUANGDE) Co.,Ltd. Applicant after: Goodway Technology Co., Ltd Address before: 242200 No.208, Tongxi East Road, Guangde Economic Development Zone, Xuancheng City, Anhui Province Applicant before: GOODWE POWER SUPPLY TECHNOLOGY (GUANGDE) Co.,Ltd. Applicant before: Jiangsu goodway Power Technology Co., Ltd |
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