CN113765418B - Switching power supply controller, switching power supply system and switching power supply system power supply method - Google Patents
Switching power supply controller, switching power supply system and switching power supply system power supply method Download PDFInfo
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- CN113765418B CN113765418B CN202110914239.XA CN202110914239A CN113765418B CN 113765418 B CN113765418 B CN 113765418B CN 202110914239 A CN202110914239 A CN 202110914239A CN 113765418 B CN113765418 B CN 113765418B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004146 energy storage Methods 0.000 claims abstract description 127
- 238000005070 sampling Methods 0.000 claims abstract description 89
- 239000003990 capacitor Substances 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims description 37
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M1/36—Means for starting or stopping 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
- 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
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a switching power supply controller, a switching power supply system and a switching power supply system power supply method, wherein the switching power supply controller comprises a built-in energy storage unit, a power switch tube sampling unit with a power switch tube, a driving unit and a logic control unit; the driving unit is used for driving the power switch tube to be turned on or off under the control of the logic control unit so as to adjust the output voltage of the switching power supply system; the built-in energy storage unit is used for supplying power to the logic control unit. The invention can save the hardware consumption of the switching power supply system, reduce the system power consumption and avoid the limit on the size of the built-in energy storage capacitor.
Description
Information about the divisional application
The scheme is a divisional application. The parent application of the divisional application is the patent application of the application No. CN202010506987.X, the name of which is a switching power supply controller, a switching power supply system and a power supply method of the switching power supply system.
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a switching power supply controller, a switching power supply system and a switching power supply system power supply method.
Background
The high-voltage step-up AC-DC switching power supply system is widely applied to the fields of home appliances, electric meters and the like, and with the progress of technology, the industry has higher requirements on the performance of products, and needs higher efficiency, lower standby power consumption, better EMI performance, better use flexibility and lower cost.
Fig. 1 shows a conventional high side buck AC-DC switching power supply system. The voltage on the AC side of the power grid is rectified by a rectifier bridge formed by diodes D1, D2, D3 and D4, and then is output as output voltage DC OUT after being controlled by a control chip U0, and the DC OUT is a fixed value. In the switching power supply system, when the switching power supply system stably works, the working voltage (namely the power supply voltage) VCC of the control chip U0 is realized by the output voltage DC OUT through the diode D6 and the VCC sampling capacitor C3, the VCC sampling capacitor C3 finishes sampling the output voltage DC OUT and supplies power to the control chip U0, that is, the power supply mode of the control chip U0 is the mode of supplying power to the output voltage, and the power supply mode of the control chip has good standby power consumption, but because the VCC sampling capacitor C3 is needed and the sampling of the output voltage DC OUT is not direct sampling, the load adjustment rate and dynamic characteristics of the output voltage DC OUT are poor.
Disclosure of Invention
The invention aims to provide a switching power supply controller, a switching power supply system and a switching power supply system power supply method, which can omit an external capacitor for sampling output voltage, reduce system power consumption and avoid the limit on the size of an internal energy storage capacitor.
In order to solve the technical problems, the invention provides a switching power supply controller for controlling the output voltage of a switching power supply system, wherein the switching power supply controller comprises a built-in energy storage unit, a power switch tube sampling unit, a driving unit and a logic control unit which are positioned in the same packaging body; wherein,,
the power switch tube sampling unit is provided with a power switch tube, the grid electrode of the power switch tube is connected with the output end of the driving unit, and the drain electrode of the power switch tube is connected with the bus direct-current voltage end of the switch power supply system;
the input end of the driving unit is connected with the corresponding output end of the logic control unit, and the driving unit is used for driving the power switch tube to be turned on or off under the control of the logic control unit so as to adjust the output voltage of the switch power supply system;
the power output end of the built-in energy storage unit is connected with the working power supply end of the logic control unit, and the built-in energy storage unit is used for supplying power to the logic control unit after the chip of the switching power supply controller is started and output is established.
Optionally, the built-in energy storage unit includes an energy storage capacitor, one end of the energy storage capacitor is grounded, and the other end of the energy storage capacitor is an electric power input end of the built-in energy storage unit.
Optionally, the built-in energy storage unit further comprises a zener diode, wherein the cathode of the zener diode is connected with the other end of the energy storage capacitor; the anode of the voltage stabilizing diode is grounded.
Optionally, the switching power supply controller further includes a high-voltage power supply unit located in the package body, one end of the high-voltage power supply unit is connected with a bus dc voltage end of the switching power supply system, the other end of the high-voltage power supply unit is connected with a power input end of the built-in energy storage unit, and the high-voltage power supply unit is used for charging the built-in energy storage unit when the power switch tube is turned off.
Optionally, the switching power supply controller further includes a power supply control unit located in the package body, where the power supply control unit is connected to the power output end of the built-in energy storage unit, the other end of the high-voltage power supply unit, the power supply end of the driving unit, and the drain electrode of the power switch tube, and the power supply control unit is used for selecting the built-in energy storage unit or the high-voltage power supply unit to supply power to the driving unit when the power switch tube is turned on.
Optionally, the power supply control unit is configured to select the high-voltage power supply unit to supply power to the driving unit or select the high-voltage power supply unit and the built-in energy storage unit to simultaneously supply power to the driving unit before the power switch tube is turned on and the drain voltage of the power switch tube is not pulled down, and select the built-in energy storage unit to supply power to the driving unit after the power switch tube is turned on and the drain voltage of the power switch tube is pulled down;
or the power supply control unit is used for selecting the built-in energy storage unit to supply power to the driving unit in the whole conduction stage of the power switch tube.
Optionally, the switching power supply controller further includes a first linear voltage regulator located in the package, the first linear voltage regulator is connected between the other end of the high-voltage power supply unit and the built-in energy storage unit, and the first linear voltage regulator is used for controlling the voltage of the built-in energy storage unit when the high-voltage power supply unit charges the built-in energy storage unit.
Optionally, the switching power supply controller further includes a second linear voltage regulator located in the package, an input end of the second linear voltage regulator is connected to an electric power output end of the built-in energy storage unit, an output end of the second linear voltage regulator is connected to an operating voltage end of the logic control unit, another input end of the second linear voltage regulator is connected to a first reference voltage, the second linear voltage regulator is configured to adjust, when the built-in energy storage unit supplies power to the logic control unit, a voltage output by the built-in energy storage unit to an operating voltage required by the logic control unit according to the first reference voltage, and when the high-voltage power supply unit supplies power to the logic control unit, adjust, according to the first reference voltage, a voltage output by the high-voltage power supply unit to an operating voltage required by the logic control unit. .
Optionally, the switching power supply controller further includes a voltage detection unit located in the package, one end of the voltage detection unit is connected to an output voltage feedback end of the switching power supply system, the other end of the voltage detection unit is connected to a corresponding input end of the logic control unit, and the voltage detection unit is configured to perform periodic voltage sampling on an output voltage of the switching power supply system, so that the logic control unit controls the driving unit to drive the power switching tube to be turned on or off according to a result of the periodic voltage sampling, and then adjusts the output voltage of the switching power supply system.
Optionally, the voltage detection unit includes a voltage sampling module, a second electronic switch and a comparator, a sampling input end of the voltage sampling module is connected with the output voltage feedback end, a sampling output end of the voltage sampling module is connected with one end of a passage of the second electronic switch, the other end of the passage of the second electronic switch is connected with an input end of the comparator, a control end of the second electronic switch is connected with a corresponding output end of the logic control unit, the other input end of the comparator is connected with a second reference voltage, and an output end of the comparator is connected with an output compensation end of the logic control unit.
Optionally, the voltage sampling module includes two voltage sampling resistors connected in series between the output voltage feedback end and ground, and a node where the two voltage sampling resistors are connected with each other is a sampling output end of the voltage sampling module; the two voltage sampling resistors are arranged in the package body or outside the package body.
Optionally, the voltage detection unit further includes an overload short-circuit protection module, an input end of the overload short-circuit protection module is connected to one end of the second electronic switch, which is connected to the comparator, and an output end of the overload short-circuit protection module is connected to a corresponding input end of the logic control unit.
Optionally, the power switch tube sampling unit is further used for sampling the current flowing through the power switch tube; the switch power supply controller also comprises a shielding time detection unit positioned in the package body, wherein the shielding time detection unit is connected with the logic control unit and the power switch tube sampling unit and is used for feeding back the shielding time of the current sampling of the power switch tube sampling unit to the logic control unit; and the logic control unit is used for controlling the on or off of the second electronic switch according to the feedback result of the shielding time detection unit.
Based on the same inventive concept, the present invention also provides a switching power supply system, comprising: an alternating current voltage source, a rectifying circuit connected with the alternating current voltage source, a bus capacitor connected with the rectifying circuit, a bus direct current voltage end connected with a common end of the bus capacitor and the rectifying circuit, and a switch power supply controller according to the invention; the switch power supply controller is connected between the bus direct-current voltage end and the output voltage end of the switch power supply system.
Optionally, the switching power supply system is a buck switching power supply system.
Based on the same inventive concept, the invention also provides a power supply method of the switching power supply system, comprising the following steps:
the method comprises the steps that a switching power supply controller is arranged, the switching power supply controller comprises a built-in energy storage unit, a power switch tube sampling unit, a driving unit and a logic control unit which are positioned in the same package body, the power switch tube sampling unit is provided with a power switch tube, the grid electrode of the power switch tube is connected with the output end of the driving unit, and the drain electrode of the power switch tube is connected with a bus direct-current voltage end of a switching power supply system;
and supplying power to the logic control unit through the built-in energy storage unit.
Optionally, when the power switch tube is turned off, a high-voltage power supply unit charges the built-in energy storage unit.
Optionally, in the on-state of the power switch tube, the high-voltage power supply unit supplies power to the driving unit before the drain voltage of the power switch tube is not pulled down, and the built-in energy storage unit supplies power to the driving unit after the drain voltage of the power switch tube is pulled down.
Compared with the prior art, the technical scheme of the invention has one of the following beneficial effects:
1. the built-in energy storage unit, the power switch tube sampling unit, the driving unit, the logic control unit and the like of the switch power supply controller are integrated in the same packaging body (namely a chip), so that an external capacitor for sampling output voltage can be omitted, the topology structure of the whole system is simpler, the system cost is low, the miniaturization and simplification of a switch power supply system are facilitated, and the switch power supply controller is suitable for application occasions with low system cost, and particularly in non-isolated auxiliary power supply applications.
2. The output voltage feedback end is not connected with the built-in energy storage unit (namely, the output voltage feedback end is not connected with the VCC capacitor), the output voltage value can be reflected in real time in the demagnetizing stage, and the load adjustment rate and the dynamic characteristic of the output voltage are improved.
3. Before the chip of the switching power supply controller is started and output is established, a high-voltage power supply unit is utilized to supply power to a logic control unit and charge a built-in energy storage unit, so that the switching power supply controller can reliably finish the chip starting and output; after the chip of the switching power supply controller is started and output is established, the built-in energy storage unit is used for supplying power to the logic control unit, and the high-voltage power supply unit is used for charging the built-in energy storage unit in the turn-off stage of the power switch tube, so that the problem that the high-voltage power supply unit cannot supply power to the logic control unit in the turn-on stage of the power switch tube can be solved; in the conduction stage of the power switch tube, the power supply control unit can be used for selecting the built-in energy storage unit and/or the high-voltage power supply unit to supply power to the driving unit, for example, the high-voltage power supply unit supplies power to the driving unit in the just conduction stage of the power switch tube and before the drain voltage of the power switch tube is not pulled down, and the built-in energy storage unit supplies power to the driving unit in the just conduction stage of the power switch tube and after the drain voltage of the power switch tube is pulled down, so that the driving current loss of the driving unit of the switching power supply system is saved, the system power consumption is reduced, and the technical prejudice that the VCC capacitor is built in the switching power supply controller and only can supply power to the driving unit by the VCC capacitor when the power switch tube is conducted, so that the required VCC capacitor is too large and the circuit area is increased is overcome, thereby the size limitation of the built-in energy storage capacitor is avoided, and the power supply requirement of the switching power supply system can be met by the small capacitor.
4. When the power switch tube is in the turn-off stage and the high-voltage power supply unit is used for charging the built-in energy storage unit, the voltage of the built-in energy storage unit can be pre-charged to the highest level (namely, the voltage is as high as possible), so that the time for the built-in energy storage unit to supply power to the driving unit is maintained to be as long as possible in the turn-on stage of the power switch tube.
5. The output voltage is periodically sampled by the voltage detection unit, and the logic control unit can quickly and accurately adjust the output voltage according to the sampling result, so that the dynamic response characteristic is improved, and the accuracy of the output voltage is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional high side buck AC-DC switching power supply system with an external VCC sampling capacitor;
FIG. 2 is a schematic circuit diagram of a switching power supply controller according to an embodiment of the present invention;
FIG. 3 is a specific example circuit schematic of the switching power supply controller shown in FIG. 2;
FIG. 4 is a schematic circuit diagram of a switching power supply controller according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a switching power supply system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a switching power supply system according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a switching power supply system according to still another embodiment of the present invention.
Detailed Description
The technical scheme provided by the invention is further described in detail below with reference to the attached drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. In this context, the meaning of two components being connected includes directly connected or indirectly connected through other components.
Referring to fig. 2 to 4, an embodiment of the present invention provides a switching power supply controller U2 for controlling an output voltage DC OUT of a switching power supply system. The switching power supply controller U2 includes: logic control unit 10, high voltage power supply unit 11, built-in energy storage unit 12, shielding time detection unit 13, voltage detection unit 14, drive unit 15, power switch tube sampling unit 16, over-temperature protection unit 17, oscillator 18, and power supply control unit 19. And the units are integrated in the same package (i.e. chip), so that the switching power supply controller of the embodiment is a switching power supply control chip. An Oscillator (OSC) 18 is electrically connected to the logic control unit 10 for adjusting the operating frequency of the switching power supply system.
Referring to fig. 3, the power switch tube sampling unit 16 includes a power switch tube Q0 and a sampling resistor Rcs, where a DRAIN end of the power switch tube Q0 is connected to a bus dc voltage end DRAIN of the switching power supply system, a source electrode is connected to one end of the sampling resistor Rcs, a gate electrode is connected to the driving unit 15, and the other end of the sampling resistor Rcs is grounded. The power sampling resistor Rcs is used for sampling the current flowing through the power switch tube Q0 to reflect the load change of the switch power supply system. Of course, in other embodiments of the present invention, the sampling resistor Rcs may be replaced by other components such as a MOS transistor or a triode.
One input end of the driving unit 15 is connected with the logic control unit 10, the other input end is connected with the over-temperature protection unit 17, the output end of the driving unit 15 is connected with the grid electrode of the power switch tube Q0, and the driving unit 15 is used for driving the power switch tube Q0 to be turned on or off under the control of the logic control unit 10 so as to adjust the output voltage DC OUT of the switching power supply system. After the power switch Q0 is turned off, the inductor L in fig. 2 starts the demagnetization process.
The over-temperature protection unit 17 is configured to detect a chip temperature of the switching power supply controller, and when the chip temperature exceeds a preset temperature threshold, control the driving unit 15 to turn off the power switch Q0, so as to avoid failure of the power switch Q0 due to over-high temperature, and reduce an output power of the switching power supply control system, thereby reducing the chip temperature in time.
The output end of the shielding time detection unit 13, which is also called a leading edge blanking (leading edge blanking, LEB) unit, is connected to the logic control unit 10, the input end thereof is connected to the source electrode of the power switch tube Q0, and the shielding time detection unit 13 is configured to feed back the shielding time of the current sampling of the power switch tube sampling unit 16 to the logic control unit 10, so that the logic control unit 10 can control the voltage detection unit 14 to perform periodic voltage sampling on the output voltage DC OUT according to the feedback result of the shielding time detection unit 13.
The voltage detection unit 14 includes a voltage sampling module 141, a second electronic switch Ts, a filter capacitor Cs, and a comparator C0mp, where the second electronic switch Ts may be an electronic component such as a MOS transistor or a triode, and the voltage sampling module 141 includes two voltage sampling resistors Rs1 and Rs2 connected in series between the output voltage feedback terminal VFB and ground. The node where the two voltage sampling resistors Rs1 and Rs2 are connected with each other is a sampling output end of the voltage sampling module 141, and is connected with one end of a path of the second electronic switch Ts. The end of the sampling resistor Rs1 connected to the output voltage feedback end VFB is a sampling input end of the voltage sampling module 141. In this embodiment, the two voltage sampling resistors Rs1 and Rs2 are built in the chip of the switching power supply controller. The other end of the second electronic switch Ts is connected with a filter capacitor Cs and an input end of a comparator C0mp, the control end of the second electronic switch Ts is connected with a corresponding signal output end of the logic control unit 10, the other input end of the comparator C0mp is connected with a second reference voltage Vref, and the output end of the comparator C0mp is connected with an output compensation end VC0mp of the logic control unit 10. The second electronic switch Ts is turned on under the control of the logic control unit 10 to sample the voltage of the output voltage DC OUT, so that the comparator C0mp can compare the voltage obtained by the voltage sampling with the second reference voltage Vref to output a voltage compensation signal VC0mp, and the logic control unit 10 can generate a PWM (pulse width modulation) signal or a PFM (pulse frequency modulation) signal for controlling the driving unit 15 according to the VC0mp signal, so that the driving unit 15 drives the power switching tube Q0 to be turned on or off to adjust the output voltage DC OUT of the switching power supply system. The voltage detection unit 14 may reflect the value of the output voltage DC OUT in real time during the demagnetization phase (i.e., after the power switch Q0 is turned off), so as to implement accurate and rapid control of the output voltage by the logic control unit 10.
Optionally, the voltage detecting unit 14 further includes an overload short-circuit protection module 142, an input end of the overload short-circuit protection module 142 is connected to one end of the second electronic switch Ts that is connected to the comparator C0mp, and an output end of the overload short-circuit protection module 142 is connected to a corresponding input end of the logic control unit 10. The overload short-circuit protection module 142 is configured to control an output current flowing through the power switching tube Q0 and a load to protect the switching power system when an output short-circuit and/or overload occurs in the switching power system. The circuit design of the overload short-circuit protection module 142 can be referred to in patent application CN105870896a, which is not described herein.
The built-in energy storage unit 12 is used for supplying power to the logic control unit 10 after the chip start-up and output establishment of the switching power supply controller are completed, so that the switching power supply controller U2 can maintain a normal working state and the like. In this embodiment, the built-in energy storage unit 12 includes an energy storage capacitor C0 and a zener diode D0, wherein one end of the energy storage capacitor C0 and an anode of the zener diode D0 are grounded, and the other end of the energy storage capacitor C0 is used as a node VCC and is connected to a cathode of the zener diode D0, and at this time, the node VCC is used as a power input end of the built-in energy storage unit 12 and is also used as a power output end of the built-in energy storage unit 12. The node VCC is also connected to an input of the power supply control unit 19. Wherein the zener diode D0 is capable of controlling the voltage on node VCC. In other embodiments of the present application, as shown in fig. 4, the zener diode D0 may be omitted, and a first linear regulator HV LDO is connected between the node VCC and the high voltage supply unit 11, and the first linear regulator HV LDO performs a voltage stabilizing function to precisely control the voltage on the node VCC on the one hand, and performs an isolating function to prevent the energy storage capacitor C0 of the built-in energy storage unit 12 from discharging the Drain of the power switch Q0 on the other hand.
The input end of the high-voltage power supply unit 11 is connected with a bus direct-current voltage end DRAIN (i.e. the DRAIN end of the power switch tube Q0) of the switch power supply system, one output end of the high-voltage power supply unit 11 is connected with the other end of the energy storage capacitor C0 and the cathode of the zener diode D0, i.e. the connection node VCC, and the other output end of the high-voltage power supply unit 11 is connected with the other input end of the power supply control unit 19. The other input end of the power supply control unit 19 is connected with the drain electrode of the power switch tube, and the output end of the power supply control unit 19 is connected with the power supply end of the driving unit 15. The high-voltage power supply unit 11 may include a depletion type field effect transistor, and a specific circuit design thereof may refer to patent application CN104124878A before the present inventor, which is not described herein. The power supply control unit 19 may include a current source, a voltage comparator, and a gate switch (e.g., a MOS transistor or a trigger) for gating a corresponding current path, and the voltage comparator in the power supply control unit 19 may be used to determine a magnitude between a drain voltage of the power switch and a set value during a conduction phase of the power switch to determine whether the drain voltage of the power switch is pulled down, thereby selecting the high voltage power supply unit 17 or the built-in energy storage unit 12 to supply power to the driving unit 15 according to a determination result. The current source in the power supply control unit 19 is used to control the magnitude of the supply current, for example, the current supplied to the driving unit 15 may be made smaller at the stage of the chip start-up and output establishment of the switching power supply controller U2, and the current supplied to the driving unit 15 may be made larger after the chip start-up and output establishment of the switching power supply controller U2.
In this embodiment, one output terminal of the high voltage power supply unit 11 is directly connected to the node VCC, and can supply power to the logic control unit 10 and charge the energy storage capacitor C0 before the chip of the switching power supply controller U2 is started and the output is established. The node VCC is connected to the working voltage terminal VDD of the logic control unit 10 through the second linear regulator VD LDO, so that after the chip of the switching power supply controller U2 is started and output is established (i.e., after the switching power supply controller U2 enters a normal working phase), the built-in energy storage unit 12 can supply power to the logic control unit 10, so that the logic control unit 10 controls the driving unit 15 to drive the power switch Q0 to be turned on or off. Since the other output end of the high-voltage power supply unit 11 and the power output end of the built-in energy storage unit 12 are both connected with the power supply driving unit 19, the power supply control unit 19 can select the high-voltage power supply unit 11 to directly supply power to the driving unit 15 immediately before the power switch tube Q0 is in the on stage and the drain voltage of the power switch tube Q0 is not pulled down, and after the drain voltage of the power switch tube Q0 is pulled down, the power switch tube Q0 enters the full on stage, and at this time, the built-in energy storage unit 12 can be selected by the power supply control unit 19 to directly supply power to the driving unit 15. Thereby, the drive current loss in the power switching transistor Q0 can be reduced.
In another embodiment of the present invention, the power supply control unit 19 may also select the high voltage power supply unit 11 and the built-in energy storage unit 12 to supply power to the driving unit 15 at the same time immediately before the power switch Q0 is turned on and the drain voltage of the power switch Q0 is not pulled down, so as to improve the power supply efficiency to the driving unit 15, and select the built-in energy storage unit 12 to directly supply power to the driving unit 15 after the drain voltage of the power switch Q0 is pulled down. In a further embodiment of the present invention, in case the energy storage capacity of the built-in energy storage unit 12 meets the requirement, the power supply control unit 19 selects the built-in energy storage unit 12 to supply power to the driving unit 15 during the entire on-period of the power switching tube Q0, whereby the power supply control strategy can be simplified.
Optionally, the switching power supply controller U2 further includes a second linear voltage regulator VD LDO, a voltage input end of the second linear voltage regulator VD LDO is connected to a node VCC and a common end of the power supply control unit 19, a voltage output end of the second linear voltage regulator VD LDO is connected to an operating voltage end VDD of the logic control unit 10, another voltage input end of the second linear voltage regulator VD LDO is connected to a first reference voltage REF, the second linear voltage regulator VD LDO is configured to adjust, when the energy storage capacitor C0 supplies power to the logic control unit 10, the voltage VCC output by the energy storage capacitor C0 to an operating voltage VDD required by the logic control unit 10 according to the first reference voltage REF, and, when the high voltage power supply unit 11 supplies power to the logic control unit 10, adjust the voltage output by the high voltage power supply unit 11 to the operating voltage VDD required by the logic control unit 10 according to the first reference voltage REF.
Referring to fig. 2 to 5, an embodiment of the present invention further provides a switching power supply system, including: the switching power supply comprises an alternating current voltage source AC IN, a rectifying circuit connected with the alternating current voltage source AC IN, a bus capacitor C1 connected with the rectifying circuit, a bus direct current voltage end DRAIN connected with a common end of the bus capacitor C1 and the rectifying circuit, a switching power supply controller U2, an inductor L, diodes D5 and D6 and an output capacitor C2. The switching power supply controller U2 is connected between the bus direct-current voltage terminal DRAIN and the output voltage terminal DC OUT of the switching power supply system. The rectifying circuit includes four diodes D1 to D4. One end of the inductor L is connected with the cathode of the diode D5 and the ground end of the switching power supply controller U2, the other end of the inductor L is connected with one end of the output capacitor C2 and the anode of the diode D6, the other end of the output capacitor C2 and the anode of the diode D5 are grounded, and the cathode of the diode D6 is connected with the output voltage feedback end VFB of the switching power supply controller U2. The alternating current voltage source AC IN is rectified by four diodes D1-D4 and filtered by a bus capacitor C1 to obtain direct current voltage Vbus. The power switch Q0, the inductor L, the diode D6 and the output capacitor C2 form a typical high-side buck switching power supply topology. The diode D6 may isolate the high voltage of the start-up phase of the switching power supply controller U2, and the voltage sampling resistors Rs1 and Rs2 may be low voltage resistors.
As an example, the switching power supply system of the present embodiment is a high side buck switching power supply system, and the voltage output by the output voltage terminal DC OUT of the switching power supply system is smaller than the direct current voltage Vbus.
In another embodiment of the present invention, referring to fig. 2 and 6, if the voltage sampling resistors Rs1 and Rs2 use high voltage resistors, the diode D6 between the output voltage feedback terminal VFB and the output voltage terminal DC OUT can be omitted, so as to further simplify the peripheral circuit.
In still another embodiment of the present invention, referring to fig. 2 and 7, the voltage sampling resistors Rs1 and Rs2 may be further external to the chip of the switching power supply controller U2, so that the diode D6 between the output voltage feedback terminal VFB and the output voltage terminal DC OUT may be output, and the output voltage DC OUT may be changed by changing the resistance values of the voltage sampling resistors Rs1 and Rs2 at the chip periphery of the switching power supply controller U2, which is more flexible to apply.
An embodiment of the present invention further provides a power supply method of a switching power supply system, which is applicable to the switching power supply systems shown in fig. 2 to 7, and the power supply method of the switching power supply system includes:
firstly, before the starting and output establishment of a switching power supply controller U2 chip of a switching power supply system, a high-voltage power supply unit 11 charges an energy storage capacitor C0 of a built-in energy storage unit 12 of the switching power supply controller, and meanwhile, the high-voltage power supply unit 11 supplies power to a logic control unit 10 of the switching power supply controller to complete the starting and output establishment of the switching power supply controller. Specifically, when the switching power supply system is started, the voltage on the energy storage capacitor C0 (i.e., the voltage of the node VCC) is initially 0, and the switching power supply system charges the energy storage capacitor C0 through the high-voltage power supply unit 11, so that the voltage on the energy storage capacitor C0 gradually increases. When the voltage on the energy storage capacitor C0 is greater than or equal to a working voltage threshold, the logic control unit 10 controls the high-voltage power supply unit 11 to be turned off, the system is started, the voltage of the node VCC can rapidly rise to reach a starting voltage threshold set in the chip of the switching power supply controller U2, and the starting and output establishment of the switching power supply controller are completed.
Then, after the output of the chip of the switching power supply controller U2 is established, the switching power supply controller U2 enters a normal working phase, at this time, the energy storage capacitor C0 of the built-in energy storage unit 12 supplies power to the logic control unit 10 through the second linear voltage regulator VD LDO, and the output voltage DC OUT is periodically sampled by the voltage detection unit 14 of the switching power supply controller U2, and the logic control unit 10 controls the driving unit 15 to drive the power switching transistor Q0 to be turned on or off according to the sampling result of the voltage detection unit 14.
In addition, the system consumption of the switching power supply system includes the chip operating current consumption of the switching power supply controller U2 and the driving current consumption, the chip operating current consumption of the switching power supply controller U2 exists in the entire operating period (including the on-phase and the off-phase) of the power switching transistor Q0, and the driving current consumption is mainly concentrated in the on-phase (i.e., just-on-phase) of the power switching transistor Q0, and the driving current consumption in the power switching transistor Q0 and the parasitic capacitance of the power switching transistor Q0 have a great relationship. In order to reduce the driving current loss of the power switch Q0, in the embodiment, in the off phase of the power switch Q0, the high-voltage power supply unit 11 charges the energy storage capacitor C0, so that the voltage on the energy storage capacitor C0 is pre-charged to a preset value, where the preset value is less than or equal to the withstand voltage value of the energy storage capacitor C0 and as high as possible; in the immediately conducting stage of the power switch tube Q0, the driving current of the power switch tube Q0 may be divided into two parts, before the drain voltage of the power switch tube Q0 is not pulled down, the power supply control unit 19 selects the high-voltage power supply unit 11 to supply power to the driving unit 15 so as to provide a corresponding driving current for the power switch tube Q0, the driving current equivalent to the power switch tube Q0 is directly provided by the high-voltage power supply unit 11, after the drain voltage of the power switch tube Q0 is pulled down, the power switch tube Q0 enters a fully conducting stage, at this time, the power supply control unit 19 selects the energy storage capacitor C0 to supply power to the driving unit 15 so as to provide a corresponding driving current for the power switch tube Q0, and the driving current equivalent to the power switch tube Q0 is directly provided by the energy storage capacitor C0. In addition, since the voltage of the energy storage capacitor C0 is pre-charged as high as possible by the high-voltage power supply unit 11 during the off-phase of the power switch Q0, the time for supplying the energy to the driving unit 15 by the energy storage capacitor C0 can be maintained as long as possible during the on-phase of the power switch Q0. It should be noted that, the time for the energy storage capacitor C0 to supply power to the logic control unit 10 of the switching power supply controller U2 is not less than the on time Ton of the power switch Q0.
By the power supply method, the driving current loss of the power switch tube is reduced, so that the total hardware consumption of the system is saved, the dynamic response characteristic is improved, and the accuracy of the output voltage is improved.
In another embodiment of the present invention, during the immediately on period of the power switch Q0, the driving current of the power switch Q0 may be divided into two parts, before the drain voltage of the power switch Q0 is not pulled down, the power supply control unit 19 selects the high voltage power supply unit 11 and the built-in energy storage unit 12 to supply power to the driving unit 15 at the same time so as to provide the corresponding driving current to the power switch Q0, which is equivalent to that the driving current of the power switch Q0 is directly provided by the high voltage power supply unit 11 and the built-in energy storage unit 12 together, and after the drain voltage of the power switch Q0 is pulled down, the power supply control unit 19 selects the energy storage capacitor C0 to supply power to the driving unit 15 so as to provide the corresponding driving current to the power switch Q0, which is equivalent to that the driving current of the power switch Q0 is directly provided by the energy storage capacitor C0.
In yet another embodiment of the present invention, the driving current of the power switching tube Q0 is provided by the built-in energy storage unit 12 during the entire on-period of the power switching tube Q0, specifically, during the on-period of the power switching tube Q0, the built-in energy storage unit 12 is selected by the power supply control unit 19 while supplying power to the driving unit 15.
In other embodiments of the present invention, the power supply control unit 19 may be omitted, and the power supply from the node VCC to the driving unit 15 and the power supply from the high voltage power supply unit 11 to the driving unit 15 may be omitted, on the basis of meeting the power consumption requirement of the product, so that the power supply from the driving unit 15 is provided by the logic control unit 10, thereby simplifying the internal circuit.
In the above embodiments, the energy storage elements in the built-in energy storage unit 12 are all exemplified by capacitors, but the technical solution of the present invention is not limited thereto, and the energy storage elements in the built-in energy storage unit 12 may be replaced by inductors, or a combination of capacitors and inductors, or the like.
In the above embodiments, the switching power supply controller, the switching power supply system, and the switching power supply system power supply method of the present invention are described by taking the logic control unit 10, the high-voltage power supply unit 11, the built-in energy storage unit 12, the shielding time detection unit 13, the voltage detection unit 14, the driving unit 15, and the power switching tube sampling unit 16, the over-temperature protection unit 17, the oscillator 18, and the power supply control unit 19 "as examples, which are integrated in the same package (i.e., chip), and are individually taken as a single module. In other embodiments of the present invention, a part of or all of the logic control unit 10, the high-voltage power supply unit 11, the built-in energy storage unit 12, the shielding time detection unit 13, the voltage detection unit 14, the driving unit 15, the power switching tube sampling unit 16, the over-temperature protection unit 17, the oscillator 18, and the power supply control unit 19 may be integrated with other units into one functional module. In other embodiments of the present invention, a part of or all of the structures of at least one of the logic control unit 10, the high-voltage power supply unit 11, the built-in energy storage unit 12, the shielding time detection unit 13, the voltage detection unit 14, the driving unit 15, the power switch tube sampling unit 16, the over-temperature protection unit 17, the oscillator 18, and the power supply control unit 19 may be external to a package (chip) of the switching power supply controller, and the rest of the structures are integrated in the same package (chip) to form the switching power supply control chip. For example, only the voltage sampling resistors Rs1, rs2 in the voltage sampling module 141 of the voltage detection unit 14 are external to the package (chip) of the switching power supply controller, and the rest of the structure of the switching power supply controller is integrated in the package (chip) of the switching power supply controller.
It should be further noted that, in each of the above embodiments, the mode of mixed power supply of the internal energy storage unit 12 and the high voltage power supply unit 11 is taken as an example, but the technical solution of the present invention is not limited thereto. For example, in other embodiments of the present invention, for example, in a high side buck switching power supply system in which the load is operated in CCM mode, the switching power supply controller may be provided with a VCC external port or a Vin external port, and in the switching power supply controller, the high voltage power supply unit may be replaced by a high voltage resistor (not shown), and one end of the high voltage resistor may be connected to the VCC external port or the Vin external port to access the bus voltage, and the other end of the high voltage resistor is connected to the VD LDO, so that the high voltage power supply unit 11 may be omitted in the switching power supply controller, and in the chip start and output establishment stage of the switching power supply controller, the bus voltage Vbus of the switching power supply system may supply power to the logic control unit 10 and charge the built-in energy storage unit 12, and then the power supply may be completely supplied by the built-in energy storage unit 12, thereby simplifying the structure of the switching power supply controller, and reducing the chip loss of the switching power supply controller itself, and improving the system efficiency.
In addition, the technical scheme of the invention is not only suitable for high side buck switching power supply systems, but also suitable for any suitable switching power supply system with constant voltage output, the output voltage of the switching power supply systems can be periodically sampled by the voltage detection unit, and the logic control unit can quickly and accurately adjust the output voltage according to the sampling result, so that the dynamic response characteristic of the switching power supply system is improved, and the precision of the output voltage is improved.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (17)
1. The switching power supply controller is used for controlling the output voltage of a switching power supply system and is characterized by comprising a built-in energy storage unit, a power switching tube sampling unit, a driving unit and a logic control unit; wherein,,
the power switch tube sampling unit is provided with a power switch tube, the grid electrode of the power switch tube is connected with the output end of the driving unit, and the drain electrode of the power switch tube is connected with the bus direct-current voltage end of the switch power supply system;
The input end of the driving unit is connected with the corresponding output end of the logic control unit, and the driving unit is used for driving the power switch tube to be turned on or off under the control of the logic control unit so as to adjust the output voltage of the switch power supply system;
the power output end of the built-in energy storage unit is connected with the working power supply end of the logic control unit, the built-in energy storage unit is used for supplying power to the logic control unit, the built-in energy storage unit comprises an energy storage capacitor, one end of the energy storage capacitor is grounded, and the other end of the energy storage capacitor is the power input end of the built-in energy storage unit;
the switching power supply controller is provided with a package body serving as a switching power supply control chip of the switching power supply system, the built-in energy storage unit is arranged in the package body, and a part of or all of structures of at least one unit of the power switching tube sampling unit, the driving unit and the logic control unit are arranged outside the package body.
2. The switching power supply controller according to claim 1, wherein the built-in energy storage unit further comprises a zener diode, a cathode of the zener diode being connected to the other end of the energy storage capacitor; the anode of the voltage stabilizing diode is grounded.
3. The switching power supply controller according to claim 1, further comprising a high-voltage power supply unit, wherein one end of the high-voltage power supply unit is connected to a bus dc voltage end of the switching power supply system, the other end of the high-voltage power supply unit is connected to a power input end of the built-in energy storage unit, and the high-voltage power supply unit is used for charging the built-in energy storage unit when the power switching tube is turned off.
4. The switching power supply controller according to claim 3, further comprising a power supply control unit connected to a power output terminal of the built-in energy storage unit, a further terminal of the high voltage power supply unit, a power source terminal of the driving unit, and a drain electrode of the power switching tube, wherein the power supply control unit is configured to select the built-in energy storage unit or the high voltage power supply unit to supply power to the driving unit when the power switching tube is turned on.
5. The switching power supply controller according to claim 4, wherein the power supply control unit is configured to select the high-voltage power supply unit to supply power to the driving unit or select the high-voltage power supply unit and the built-in energy storage unit to supply power to the driving unit simultaneously before a power switching tube is turned on and a drain voltage of the power switching tube is not pulled down, and select the built-in energy storage unit to supply power to the driving unit after the power switching tube is turned on and the drain voltage of the power switching tube is pulled down;
Or the power supply control unit is used for selecting the built-in energy storage unit to supply power to the driving unit in the whole conduction stage of the power switch tube.
6. The switching power supply controller according to claim 3, further comprising a first linear voltage regulator connected between the other end of the high voltage power supply unit and the built-in energy storage unit, the first linear voltage regulator being configured to control a voltage of the built-in energy storage unit and isolate the built-in energy storage unit from a drain of the power switching tube when the high voltage power supply unit charges the built-in energy storage unit.
7. The switching power supply controller according to claim 3, further comprising a second linear voltage regulator, wherein an input end of the second linear voltage regulator is connected to the power output end of the built-in energy storage unit, an output end of the second linear voltage regulator is connected to the operating voltage end of the logic control unit, another input end of the second linear voltage regulator is connected to a first reference voltage, the second linear voltage regulator is used for adjusting the voltage output by the built-in energy storage unit to the operating voltage required by the logic control unit according to the first reference voltage when the built-in energy storage unit supplies power to the logic control unit, and adjusting the voltage output by the high-voltage power supply unit to the operating voltage required by the logic control unit according to the first reference voltage when the high-voltage power supply unit supplies power to the logic control unit.
8. The switching power supply controller according to claim 1, further comprising a voltage detection unit, wherein one end of the voltage detection unit is connected to an output voltage feedback end of the switching power supply system, the other end of the voltage detection unit is connected to a corresponding input end of the logic control unit, and the voltage detection unit is used for periodically sampling the output voltage of the switching power supply system, so that the logic control unit controls the driving unit to drive the power switching tube to be turned on or off according to the result of the periodic voltage sampling, and then adjusts the output voltage of the switching power supply system.
9. The switching power supply controller according to claim 8, wherein the voltage detection unit includes a voltage sampling module, a second electronic switch and a comparator, a sampling input end of the voltage sampling module is connected to the output voltage feedback end, a sampling output end of the voltage sampling module is connected to one end of a path of the second electronic switch, the other end of the path of the second electronic switch is connected to an input end of the comparator, a control end of the second electronic switch is connected to a corresponding output end of the logic control unit, another input end of the comparator is connected to a second reference voltage, and an output end of the comparator is connected to an output compensation end of the logic control unit.
10. The switching power supply controller according to claim 9, wherein the voltage sampling module includes two voltage sampling resistors connected in series between the output voltage feedback terminal and ground, and a node where the two voltage sampling resistors are connected to each other is a sampling output terminal of the voltage sampling module; the two voltage sampling resistors are arranged in the package body or outside the package body.
11. The switching power supply controller according to claim 9 or 10, wherein the voltage detection unit further comprises an overload short-circuit protection module, an input terminal of the overload short-circuit protection module being connected to one terminal of the second electronic switch and the comparator, and an output terminal of the overload short-circuit protection module being connected to a corresponding input terminal of the logic control unit.
12. The switching power supply controller according to claim 9, wherein the power switching tube sampling unit is further configured to sample a current flowing through the power switching tube; the switch power supply controller also comprises a shielding time detection unit, wherein the shielding time detection unit is connected with the logic control unit and the power switch tube sampling unit and is used for feeding back the shielding time of the current sampling of the power switch tube sampling unit to the logic control unit; and the logic control unit is used for controlling the on or off of the second electronic switch according to the feedback result of the shielding time detection unit.
13. A switching power supply system, comprising: an ac voltage source, a rectifying circuit connected to the ac voltage source, a bus capacitor connected to the rectifying circuit, a bus dc voltage terminal connected to a common terminal of the bus capacitor and the rectifying circuit, and a switching power supply controller according to any one of claims 1 to 12; the switch power supply controller is connected between the bus direct-current voltage end and the output voltage end of the switch power supply system.
14. The switching power supply system of claim 13 wherein said switching power supply system is a buck switching power supply system.
15. A method of supplying power to a switching power supply system, comprising:
the switching power supply controller according to any one of claims 1-12, comprising a built-in energy storage unit, a power switch tube sampling unit, a driving unit and a logic control unit, wherein the power switch tube sampling unit is provided with a power switch tube, the grid electrode of the power switch tube is connected with the output end of the driving unit, and the drain electrode of the power switch tube is connected with a bus direct-current voltage end of the switching power supply system;
And supplying power to the logic control unit through the built-in energy storage unit.
16. The method of claim 15, wherein a high voltage power supply unit charges the built-in energy storage unit when the power switch is turned off.
17. The switching power supply system supply method according to claim 16, wherein the drive unit is supplied with power by the high-voltage power supply unit and/or the built-in energy storage unit before the drain voltage of the power switching tube is not pulled down in the on-period of the power switching tube, and the drive unit is supplied with power by the built-in energy storage unit after the drain voltage of the power switching tube is pulled down.
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| DE4111277A1 (en) * | 1991-04-08 | 1992-10-15 | Thomson Brandt Gmbh | STARTING CIRCUIT FOR A SWITCHING POWER SUPPLY |
| CN101562394B (en) * | 2009-03-06 | 2012-01-04 | 西安民展微电子有限公司 | Soft start circuit used in monolithic integration switching-type regulator |
| JP2011250554A (en) * | 2010-05-26 | 2011-12-08 | Sony Corp | Power circuit, integrated circuit device, solid state image pickup device, and electronic apparatus |
| CN108809101B (en) * | 2018-05-16 | 2021-03-23 | 深圳原能电器有限公司 | High-integration power management integrated circuit |
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| CN104485634A (en) * | 2014-12-16 | 2015-04-01 | 上海数明半导体有限公司 | Power supply management system and method for achieving average current protection |
| CN106300962A (en) * | 2016-08-08 | 2017-01-04 | 杰华特微电子（杭州）有限公司 | A kind of self-powered control circuit |
| CN107027218A (en) * | 2017-04-27 | 2017-08-08 | 深圳市芯飞凌半导体有限公司 | LED control chips and LED light device |
| CN109478844A (en) * | 2017-06-02 | 2019-03-15 | 深圳市稳先微电子有限公司 | A kind of power switch driver circuit of built-in power supply capacitor |
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