CN113193732B - Self-adaptive charging bootstrap power supply - Google Patents
Self-adaptive charging bootstrap power supply Download PDFInfo
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- CN113193732B CN113193732B CN202110461276.XA CN202110461276A CN113193732B CN 113193732 B CN113193732 B CN 113193732B CN 202110461276 A CN202110461276 A CN 202110461276A CN 113193732 B CN113193732 B CN 113193732B
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- power supply
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- tube
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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
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
Abstract
The invention belongs to the technical field of power supply circuits, and particularly relates to a bootstrap power supply capable of self-adaptive charging. The output voltage of the floating power supply is referenced to the DC-DC BUCK circuit switch signal SW, no matter how SW changes, a set output voltage relative to SW can be obtained, and therefore the bootstrap capacitor can be continuously charged in the Toff stage to compensate the consumed energy.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a bootstrap power supply capable of self-adaptive charging.
Background
As shown in fig. 1, most of the switching transistors of the current DC-DC BUCK voltage reduction circuit are NMOS, the upper transistor needs to be powered by a power supply higher than the input voltage VIN, the conventional solution is to provide a power supply higher than the input voltage VIN by using a bootstrap capacitor, and the energy storage of the bootstrap capacitor is implemented by charging the bootstrap capacitor through an internal low-voltage power supply. In practical application, the control chip opens the upper tube at the Ton stage of the switch signal SW, turns off the lower tube and increases the inductive current; in the Toff stage, the upper tube is turned off, the lower tube is opened, and the inductor current is reduced. When the output load is light load, the energy input by the power supply in one switching period may be larger than the required output load, and at this time, VOUT voltage reflected by VFB is higher than the set voltage, the chip will be kept in Toff stage, so that the inductor current will be continuously reduced until the inductor current is reduced to zero. In consideration of efficiency, an inductive current zero-crossing detection module is arranged in a general chip, when the inductive current is detected to be zero, the lower tube of the chip is turned off, if the VOUT voltage reflected by the VFB is still higher than the set voltage, the next new switching period cannot be started, the upper tube is kept to be turned off, the SW oscillates, and the average voltage of the SW is equal to the output voltage VOUT. The working conditions of the BUCK synchronous voltage reduction circuit are similar to the working conditions of the BUCK asynchronous voltage reduction circuit, but the logic control after the zero crossing of the inductive current is realized by the characteristics of the diode.
Since the output voltage of the internal power supply mentioned above is referenced to the chip ground, when SW is equal to VOUT, the external bootstrap capacitor cannot be fully charged as designed, which is particularly obvious when VOUT is close to the output voltage of the internal power supply, and at this time, the bootstrap capacitor can hardly be charged, and when the next cycle comes, the voltage of the bootstrap capacitor will be lower than the designed value, which may cause the on-resistance of the upper transistor to become large, and increase the power consumption. If the bootstrap capacitor supply module is also loaded, the energy stored on the bootstrap capacitor may be further dissipated, resulting in the inability to turn on the upper tube.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a floating internal power supply, which can be used for continuously charging a bootstrap capacitor in various operating conditions of a DC-DC BUCK circuit.
The technical scheme of the invention is as follows:
a bootstrap power supply capable of self-adaptively charging is used for a DC-DC BUCK circuit and is characterized by comprising a bias current source, a diode, an NMOS tube, a resistor and a capacitor; the input end of the bias current source is connected with the power supply, and the output end of the bias current source is connected with the grid of the NMOS tube and one end of the resistor; the anode of the diode is connected with the power supply, and the cathode of the diode is connected with the drain electrode of the NMOS tube; and the source electrode of the NMOS tube is connected with one end of a capacitor, and the other end of the capacitor is connected with the other end of the resistor and then connected with a switching signal of the DC-DC BUCK circuit.
The method is a basic floating internal power supply provided by the invention, and when a switching signal of the DC-DC BUCK circuit changes within a certain range, the voltage on the capacitor can be kept unchanged.
A bootstrap power supply capable of self-adaptively charging is used for a DC-DC BUCK circuit and is characterized by comprising a bias current source, a first diode, a second diode, a voltage regulator tube, an NMOS tube, a first capacitor and a second capacitor; the positive electrode of the second diode is connected with the power supply, the negative electrode of the second diode is connected with the input end of the bias current source, and the output end of the bias current source is connected with the negative electrode of the voltage regulator tube, one end of the first capacitor and the grid electrode of the NMOS tube; the anode of the first diode is connected with the power supply, and the cathode of the first diode is connected with the drain electrode of the NMOS tube; and the source electrode of the NMOS tube is connected with one end of a second capacitor, and the other end of the second capacitor, the other end of the first capacitor and the anode of the voltage stabilizing tube are connected and then connected with a switching signal of the DC-DC BUCK circuit.
The scheme is an optimized scheme on the basic floating internal power supply, after optimization and improvement, the voltage of the voltage-stabilizing tube Z1 is sampled by the first capacitor C1, even if the potential of a switching signal of the DC-DC BUCK circuit rises to be close to a power supply VIN, the voltage of the voltage-stabilizing tube Z1 can be kept acting on a grid electrode of an NMOS (N-channel metal oxide semiconductor) because the electric energy stored by the first capacitor C1 has no discharging channel, and the charging channel of the second capacitor Cbst can be ensured to be opened all the time.
The invention has the beneficial effects that: unlike the conventional output voltage reference chip of the internal power supply, the output voltage of the floating power supply of the invention is referenced to the DC-DC BUCK circuit switch signal SW, and a set output voltage relative to SW can be always obtained no matter how SW is changed, so that the bootstrap capacitor can be continuously charged in the Toff stage to compensate the consumed energy.
Drawings
FIG. 1 is a system implementation of a conventional DC-DC BUCK voltage reduction circuit;
FIG. 2 is a conventional internal power supply referenced to chip ground;
FIG. 3 is a basic floating internal power supply architecture according to the present invention;
fig. 4 shows the floating internal power structure proposed by the present invention.
Detailed Description
The technical scheme of the invention is described in detail in the following with the accompanying drawings:
fig. 2 shows a conventional internal power supply referenced to chip ground, with the LV output charging a capacitor Cbst between nodes VBST and SW through a diode D1. The voltage on the capacitor Cbst is equal to the output voltage of LV minus the forward voltage drop of diode D1 and the voltage of SW to GND. As previously described, a light load may occur where the average SW voltage is equal to the system output voltage VOUT, thus reducing the maximum voltage that can be maintained on capacitor Cbst, which is more pronounced the greater VOUT is.
In a basic floating internal power supply proposed in fig. 3, the current of the bias current source Ibias generates a voltage relative to SW through the resistor R1, and the voltage on Cbst is equal to the voltage on the resistor R1 minus the Vgs voltage of NM 1. The voltage on Cbst may remain constant when SW varies within a certain range. The circuit structure also has a limitation that if the SW potential is raised to a certain degree, the current of the bias current source Ibias is reduced, the voltage on the resistor R1 is reduced, and the voltage on Cbst is reduced.
Fig. 4 is an optimized improvement based on the basic floating internal power supply proposed in fig. 3. The resistor R1 is replaced by a voltage regulator tube Z1, a diode D2 is added between a bias current source Ibias and VIN, and the output voltage of the voltage regulator tube Z1 can be sampled by a capacitor C1 between the grid of the NM1 and the SW. After the internal power supply is optimized and improved, the voltage on Cbst is equal to the voltage of the voltage regulator tube Z1 minus the Vgs voltage of NM 1. Considering the limit, when the SW potential rises close to VIN, the voltage across the resistor R1 is close to zero, in which case the capacitor Cbst cannot be charged, in fact as long as the Vgs voltage of NM1 decreases to the threshold voltage of NM 1. After optimization and improvement, the voltage of the voltage-regulator tube Z1 is sampled by the capacitor C1, and even when the SW potential rises to be close to VIN, the voltage of the voltage-regulator tube Z1 can be kept acting on the grid electrode of NM1 because the electric energy stored by the capacitor C1 has no discharging channel, so that the charging channel of the capacitor Cbst can be ensured to be opened all the time. If the voltage on the capacitor C1 is higher than the breakdown voltage of the voltage regulator tube Z1 after multiple switching actions, the voltage regulator tube Z1 can safely release the redundant stored electric energy on the capacitor C1. The optimization and improvement also obtain an advantage that the requirement on a bias current source is relaxed due to the voltage stabilizing characteristic of the voltage stabilizing tube.
Claims (1)
1. A bootstrap power supply capable of self-adaptively charging is used for a DC-DC BUCK circuit and is characterized by comprising a bias current source, a first diode, a second diode, a voltage regulator tube, an NMOS tube, a first capacitor and a second capacitor; the positive electrode of the second diode is connected with the power supply, the negative electrode of the second diode is connected with the input end of the bias current source, and the output end of the bias current source is connected with the negative electrode of the voltage regulator tube, one end of the first capacitor and the grid electrode of the NMOS tube; the anode of the first diode is connected with the power supply, and the cathode of the first diode is connected with the drain electrode of the NMOS tube; and the source electrode of the NMOS tube is connected with one end of a second capacitor, and the other end of the second capacitor, the other end of the first capacitor and the anode of the voltage stabilizing tube are connected and then connected with a switch signal port SW of the DC-DC BUCK circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110461276.XA CN113193732B (en) | 2021-04-27 | 2021-04-27 | Self-adaptive charging bootstrap power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110461276.XA CN113193732B (en) | 2021-04-27 | 2021-04-27 | Self-adaptive charging bootstrap power supply |
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| CN113193732A CN113193732A (en) | 2021-07-30 |
| CN113193732B true CN113193732B (en) | 2022-12-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462388A (en) * | 2017-02-20 | 2018-08-28 | 上海贝岭股份有限公司 | The realization circuit of bootstrap power supply |
| CN208571909U (en) * | 2018-08-17 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of boostrap circuit |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7592831B2 (en) * | 2007-04-05 | 2009-09-22 | International Rectifier Corporation | Circuit to optimize charging of bootstrap capacitor with bootstrap diode emulator |
| CN102629855B (en) * | 2012-04-13 | 2015-04-08 | 成都芯源系统有限公司 | Noise suppression circuit and control method thereof |
| JP2014023269A (en) * | 2012-07-18 | 2014-02-03 | Renesas Electronics Corp | Semiconductor integrated circuit and method of operating the same |
| CN102868295B (en) * | 2012-09-10 | 2015-06-03 | 西安启芯微电子有限公司 | Bootstrap type charging circuit applied to high-voltage DC-DC (Direct Current-Direct Current) convertor |
| TWM472362U (en) * | 2013-08-07 | 2014-02-11 | Richtek Technology Corp | Buck switching regulator |
| CN104022776B (en) * | 2014-06-27 | 2017-01-25 | 东南大学 | Bootstrapping diode artificial circuit in half-bridge driving circuit |
| JP2016174453A (en) * | 2015-03-16 | 2016-09-29 | 株式会社東芝 | Dc/dc converter |
| CN106714032B (en) * | 2015-11-18 | 2020-02-04 | 晶豪科技股份有限公司 | Electronic device with bootstrap capacitor charging circuit |
| JP6577348B2 (en) * | 2015-11-26 | 2019-09-18 | ローム株式会社 | Synchronous rectification type DC / DC converter |
| CN107592013A (en) * | 2017-09-22 | 2018-01-16 | 无锡麟力科技有限公司 | Control circuit and method applied to bootstrap capacitor power loss recovery in DC DC converters |
| CN108809063B (en) * | 2018-06-15 | 2019-08-30 | 电子科技大学 | A kind of driving boostrap circuit of full Embedded |
| CN109039029B (en) * | 2018-08-15 | 2020-02-04 | 电子科技大学 | Bootstrap charging circuit suitable for GaN power device gate drive circuit |
| US10784764B2 (en) * | 2019-02-01 | 2020-09-22 | Texas Instruments Incorporated | Switched-mode DC/DC converter having a bootstrapped high-side driver |
| CN210839348U (en) * | 2019-11-29 | 2020-06-23 | 深圳市皓文电子有限公司 | Non-isolated buck-boost converter |
| CN111049100B (en) * | 2019-12-10 | 2021-09-03 | 中国电子科技集团公司第五十八研究所 | Bootstrap circuit with clamping function |
| CN112072900B (en) * | 2020-08-25 | 2021-07-09 | 苏州纳芯微电子股份有限公司 | Drive circuit of drive chip |
| CN112165252B (en) * | 2020-09-22 | 2021-08-13 | 郑州嘉晨电器有限公司 | Narrow pulse control-based bootstrap drive circuit of BUCK converter |
-
2021
- 2021-04-27 CN CN202110461276.XA patent/CN113193732B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462388A (en) * | 2017-02-20 | 2018-08-28 | 上海贝岭股份有限公司 | The realization circuit of bootstrap power supply |
| CN208571909U (en) * | 2018-08-17 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of boostrap circuit |
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| CN113193732A (en) | 2021-07-30 |
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