CN115411926A - A slow starting circuit for electrical power generating system - Google Patents
A slow starting circuit for electrical power generating system Download PDFInfo
- Publication number
- CN115411926A CN115411926A CN202211219531.0A CN202211219531A CN115411926A CN 115411926 A CN115411926 A CN 115411926A CN 202211219531 A CN202211219531 A CN 202211219531A CN 115411926 A CN115411926 A CN 115411926A
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- China
- Prior art keywords
- power supply
- resistor
- supply system
- circuit
- capacitor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H02M1/36—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
- 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
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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
- H02M1/34—Snubber circuits
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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 relates to a slow starting circuit for a power supply system, and belongs to the technical field of switching power supplies. The slow start circuit includes: the power supply comprises a main power supply VDD, a driving power supply VDD1, a switching tube driving circuit, a slow starting circuit, a switching tube and an output circuit. The slow starting circuit of the power supply system can be widely applied to the slow starting circuit of the power supply system, particularly the power supply system with strict requirements on the rising rate of a power supply, so that the power supply system can realize the slow starting of the power supply system without excessive electronic components, and additional power consumption caused by adding additional electronic components is avoided, thereby simplifying the structure of the power supply system and improving the cost performance of the power supply system. In addition, the slow starting circuit of the power supply system has the application scenes including but not limited to a switching power supply system, an AC-DC power supply system and a DC-DC power supply system, has wide application scenes and is convenient to popularize and apply.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a slow start circuit for a power supply system.
Background
AC/DC and DC/DC power supplies have been widely used in power electronic devices, and as electronic devices become more and more sophisticated and the need for hot plugging increases, the demand for power systems also increases. At the moment of starting a circuit, the capacitor in the circuit is charged due to the connection of the circuit, so that a large impact current is generated, the voltage of a power supply drops and shakes, strong electromagnetic radiation is generated, the integrated circuit in the circuit is affected, and the system works unstably; on the other hand, when the hot plug device is plugged into the socket, the male connector and the female connector of the connector are not contacted stably, and a certain jitter is generated and is applied to the power supply in turn, so that the output of the power supply is not stable. If the instantaneous rising speed of the power supply can be delayed, the slope of the rising edge is reduced, and the power-on speed of the power supply is reduced to a certain extent, the two adverse effects can be greatly reduced.
Disclosure of Invention
The invention aims to provide a slow start circuit for a power supply system, which can realize the slow start of an electric power supply, and can add additional components without introducing additional power consumption, thereby simplifying the structure of the power supply system and improving the cost performance of the system.
In order to achieve the purpose, the invention provides the following scheme:
the utility model provides a slow starting circuit for electrical power generating system, electrical power generating system's slow starting circuit belongs to switching power supply technical field. The slow start circuit includes: the power supply comprises a main power supply VDD, a driving power supply VDD1, a switching tube driving circuit, a slow starting circuit, a switching tube and an output circuit;
the switching tube driving circuit includes: the power supply, the driving power supply and the switch tube driving circuit are respectively connected with a resistor and a triode by one end after the two resistors are connected in series, the driving power supply is divided by one end, the other end of the two resistors in series is grounded, the midpoint (voltage dividing point) of the resistor series is connected with the base electrode of the triode, the collector electrode of the triode is connected with the main power supply by the resistor, the emitter electrode of the triode is grounded by the resistor, one end of the current limiting resistor of the grid electrode of the switch tube is connected with the grid electrode of the switch tube, and the other end of the current limiting resistor is connected with the emitter electrode of the triode;
the slow start circuit includes: the switch tube comprises a main power supply, a Miller capacitor, a capacitor and a resistor inside the switch tube, wherein a drain electrode of the switch tube is connected with the main power supply, a grid electrode of the switch tube is connected with one end of a grid electrode current-limiting resistor of the switch tube, the other end of the grid electrode current-limiting resistor is connected with a collector electrode of a triode, a slow starting capacitor is connected in parallel between the drain electrode and the grid electrode of the switch tube, and one end of the capacitor is connected with the drain electrode of the switch tube. The other end is connected with a source electrode of the switching tube;
the switch tube is a PMOS switch tube or an NMOS switch tube;
the output circuit includes: the capacitor and the resistor form a parallel circuit, one end of the parallel circuit is connected to the source electrode of the switch tube, and the other end of the parallel circuit is grounded.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain similar applications only by making some necessary adjustments to the drawings without much inventive labor.
FIG. 1 is a schematic circuit diagram of an implementation of a DC/DC power soft start circuit according to the present invention;
FIG. 2 is an equivalent schematic diagram of a slow start driving portion provided in the present invention;
FIG. 3 is a schematic diagram of waveforms of gate driving voltage and current of a switching tube in a slow start state according to the present invention;
fig. 4 is a schematic waveform diagram of the conduction of the switching tube in the power supply slow start state provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a slow start circuit for a power supply system, which can realize the slow start of an electric power supply, is additionally provided with an additional component, and does not introduce additional power consumption, thereby simplifying the structure of the power supply system and improving the cost performance of the system.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a slow starting circuit for a power system, which can be widely applied to power systems such as AC/DC (alternating current/direct current), DC/DC (direct current/direct current) and the like. FIG. 1 is a schematic circuit diagram of an implementation of a DC/DC power soft start circuit according to the present invention; the invention provides an equivalent schematic diagram of a slow start driving part; FIG. 3 is a schematic diagram of waveforms of gate driving voltage and current of a switching tube in a slow start state according to the present invention; fig. 4 is a schematic diagram of waveforms of conduction of the switch tube in the power supply slow start state provided by the present invention.
Referring to fig. 1, the slow power start circuit provided in the present invention includes: the driving circuit comprises a driving power supply VDD1, a resistor 101, a resistor 102, a transistor 103, a resistor 104, a resistor 105, a main power supply VDD, a resistor 201, a capacitor 202, a switching tube 301, a capacitor 401, a resistor 402 and the like.
Specifically, the driving power supply VDD1, the main power supply VDD, the resistor 101, the resistor 102, the resistor 104, the resistor 105, and the transistor 103 constitute a driving circuit of the switching tube. The driving power supply VDD1 is connected to one end of a resistor 101, the other end of the resistor 101 is connected to one end of a resistor 102 to form a series circuit, and the other end of the resistor 102 is grounded. The resistor 101 and the resistor 102 divide the voltage of the driving power supply VDD1, and the driving voltage (the midpoint between the connection of the resistor 101 and the resistor 102) obtained after the voltage division is connected to the base of the transistor.
The main power supply VDD, the resistor 104, the triode 103, the resistor 105 and the resistor 201 form a gate driving circuit of the switching tube. One end of the resistor 104 is connected with a main power supply, the other end of the resistor 104 is connected with a collector of the triode 103 to be used as a bias voltage of the triode, an emitter of the triode 103 is grounded through a resistor 105, one end of a resistor 201 is connected with an emitter of the triode 103, and the other end of the resistor 201 is connected with a grid electrode of the switching tube 301.
The capacitor 202, the resistor 201, the drain of the switching tube 301 and the gate (miller capacitance between the gate and the drain) jointly form a slow start circuit. One end of the capacitor 202 is connected to the drain of the switching tube 301, and the other end is connected to the gate of the switching tube 301.
The source of the switch tube, the capacitor 401 and the resistor 402 together form an output circuit. The capacitor 401 and the resistor 402 are connected in parallel, and then one end of the capacitor is connected to the source of the switching tube 301, and the other end is grounded.
Referring to fig. 3, when the main power supply VDD is turned on and the driving power supply VDD1 is also turned on, the driving power supply divides the voltage by the resistor 101 and the resistor 102 and generates a forward bias to the transistor 103, the transistor 103 is in a saturated conduction state, and the gate potential of the switching tube is pulled down to a low potential by the resistor 201, so that the switching tube is driven to be in a conduction state and output a voltage. However, due to the existence of the capacitor 202, after the triode is in saturated conduction, the capacitor 202 starts to discharge, the discharge time is in direct proportion to the values of the capacitor 202 and the resistor 201, and the larger the values of the capacitor 202 and the resistor 201 are, the longer the discharge time is, the slower the gate potential of the switching tube 301 drops, so that the conduction time of the switching tube is prolonged.
Specifically, as shown in fig. 3 and 4, the waveforms of the gate driving voltage and the current of the switching tube are schematically shown, when the base of the transistor 103 is configured in the forward direction, the transistor 103 is in saturated conduction, the gate of the switching tube is biased in the forward direction through the resistor 201, the gate voltage starts to rise (as shown in fig. 4 interval 1), the voltage does not increase for a period of time due to the clamping effect of the charging voltage of the capacitor 202, the current sharply and linearly increases to form a miller platform (as shown in fig. 4 interval 2), when the capacitor is fully charged, the voltage and the current both sharply and linearly increase, and the switching tube is started to output the voltage to the output end after the threshold voltage of the gate of the switching tube is reached, so that slow start is realized.
Claims (6)
1. A slow starting circuit for a power supply system is applied to a switching power supply system, an AC-DC power supply system and a DC-DC power supply system.
2. Wherein the circuit comprises: the power supply comprises a main power supply, a driving power supply, a switching tube driving circuit, a slow starting circuit, a switching tube and an output circuit; the slow starting circuit consists of a Miller capacitor, a capacitor and a resistor inside the switch tube.
3. The slow start circuit of claim 1, wherein the driving circuit comprises: the main power supply, the driving power supply and the switch tube driving circuit are composed of resistors and triodes, wherein one end of each resistor is connected with the driving power supply to divide voltage of the driving power supply after the resistors are connected in series, the other end of each resistor is grounded, the resistor voltage dividing point is connected with the base electrode of the triode, the collector electrode of the triode is connected with the main power supply through the resistor, and the emitter electrode of the triode is grounded.
4. The power system slow start circuit according to claim 1, wherein said slow start circuit comprises: the switch comprises a main power supply, a Miller capacitor, a capacitor and a resistor in the switch tube, wherein the drain electrode of the switch tube is connected with the main power supply, the grid electrode of the switch tube is connected with the collector electrode of the triode through the resistor, and the capacitor is connected in parallel between the drain electrode and the grid electrode of the switch tube.
5. The slow start circuit of claim 1, wherein the switch transistors are PMOS switch transistors and NMOS switch transistors.
6. The slow start circuit of claim 1, wherein the output circuit comprises: and the capacitor and the resistor are connected in parallel, one end of the capacitor and the resistor is connected to the source electrode of the switching tube, and the other end of the capacitor and the resistor are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211219531.0A CN115411926A (en) | 2022-10-08 | 2022-10-08 | A slow starting circuit for electrical power generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211219531.0A CN115411926A (en) | 2022-10-08 | 2022-10-08 | A slow starting circuit for electrical power generating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115411926A true CN115411926A (en) | 2022-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211219531.0A Pending CN115411926A (en) | 2022-10-08 | 2022-10-08 | A slow starting circuit for electrical power generating system |
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| Country | Link |
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| CN (1) | CN115411926A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117013836A (en) * | 2023-09-11 | 2023-11-07 | 深圳市微源半导体股份有限公司 | Voltage conversion circuit and power supply system |
-
2022
- 2022-10-08 CN CN202211219531.0A patent/CN115411926A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117013836A (en) * | 2023-09-11 | 2023-11-07 | 深圳市微源半导体股份有限公司 | Voltage conversion circuit and power supply system |
| CN117013836B (en) * | 2023-09-11 | 2024-01-12 | 深圳市微源半导体股份有限公司 | Voltage conversion circuit and power supply system |
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