CN109067161B - Power supply safety starting system - Google Patents
Power supply safety starting system Download PDFInfo
- Publication number
- CN109067161B CN109067161B CN201810901314.7A CN201810901314A CN109067161B CN 109067161 B CN109067161 B CN 109067161B CN 201810901314 A CN201810901314 A CN 201810901314A CN 109067161 B CN109067161 B CN 109067161B
- Authority
- CN
- China
- Prior art keywords
- switching tube
- circuit
- power supply
- soft start
- voltage
- Prior art date
- 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.)
- Active
Links
- 238000007599 discharging Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
-
- 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
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a power supply safety starting system, which comprises: a switching circuit, a discharging circuit and a soft start circuit; the switching circuit is connected between the power supply and the external equipment, the discharging circuit is connected with the power supply and the switching circuit, and the soft start circuit is connected with the switching circuit and the external equipment; the switching circuit comprises a first switching tube and a second switching tube; the first switching tube is connected with the power supply, the discharging circuit and the soft start circuit, and the second switching tube is connected with the discharging circuit and the external equipment; when the input voltage of the power supply reaches the starting voltage of the discharging circuit, the discharging circuit controls the first switching tube and the second switching tube to be conducted within a preset first delay time, so that the external equipment discharges through the second switching tube; after the first delay time, the discharge circuit controls the first switching tube and the second switching tube to be disconnected; after the second delay time is preset, the soft start circuit controls the third switching tube to be conducted gradually, so that the power supply can supply power to the external equipment gradually.
Description
Technical Field
The invention relates to the field of power supply starting, in particular to a power supply safety starting system.
Background
With the development of scientific technology, electronic technology is rapidly developed, the variety of electronic products is more and more abundant, and the electronic products play an irreplaceable role in human life. The reliability requirements for the product are not the same as the use environment of the product is different. The power-up process of an electronic system has a great influence on the reliability of the product. For example, some electronic products require soft start-up to protect the electronic product from surge impact during start-up. Some devices are used in industrial scenes, the use environment is bad, especially, the voltage is unstable in the starting process of the centralized power-on of multiple devices, at the moment, the delayed starting is needed to avoid the unstable process, meanwhile, the voltage fluctuation is detected, and if the undervoltage condition occurs, the effective resetting is needed. At present, a plurality of technologies adopt discrete devices to realize delayed start or soft start, and along with the progress of the technologies, some integrated chips also appear to realize soft start. However, the safe starting of the device is not only to avoid surge and unstable voltage, but also very critical to the sufficient power failure before starting, and a single chip cannot meet the application of various occasions.
Disclosure of Invention
In order to solve the problems that the current equipment power-on process can not realize soft start, delay, full power failure and the like at the same time, the invention provides a power supply safety starting system, which comprises: a switching circuit, a discharging circuit and a soft start circuit; the switch circuit is connected between a power supply and external equipment, the discharge circuit is connected with the power supply and the switch circuit, and the soft start circuit is connected with the power supply, the switch circuit and the external equipment;
The switching circuit comprises a first switching tube and a second switching tube; the first switching tube is connected with the power supply, the discharging circuit and the soft starting circuit, and the second switching tube is connected with the power supply, the discharging circuit and the external equipment;
after the power supply is started, when the power supply input voltage reaches the starting voltage of the discharging circuit, the discharging circuit controls the first switching tube and the second switching tube to be conducted within a preset first delay time, so that the external equipment discharges through the second switching tube within the first delay time;
After the first delay time, the discharging circuit controls the first switching tube and the second switching tube to be disconnected;
After a second delay time is preset, the soft start circuit controls the third switching tube to be conducted gradually, so that the power supply can supply power to the external equipment gradually.
Optionally, in an embodiment of the present invention, the system further includes a filter circuit, and the filter circuit is connected to the power supply, the discharging circuit, and the soft start circuit.
Optionally, in an embodiment of the present invention, a gate of the first switching tube is connected to a gate of the second switching tube, the discharging circuit and the power supply, a drain of the first switching tube is connected to the soft start circuit, and a source of the first switching tube is grounded.
Optionally, in an embodiment of the present invention, a source of the second switching tube is grounded, and a drain of the second switching tube is connected to the external device; when the second switching tube is turned on, the external device discharges to the ground through the second switching tube.
Optionally, in an embodiment of the present invention, the switching circuit further includes a fourth switching tube, a source electrode of the fourth switching tube is grounded, a drain electrode of the fourth switching tube is connected to a gate electrode of the first switching tube and a gate electrode of the second switching tube, and a gate electrode of the fourth switching tube is connected to the discharge circuit.
Optionally, in an embodiment of the present invention, the discharging circuit controls the fourth switching tube to be turned off in the first delay time, so that the first switching tube and the second switching tube are turned on in the first delay time.
Optionally, in an embodiment of the present invention, the first voltage detection module and the reset controller; the voltage detection module is connected with the power supply and the reset controller and is used for detecting whether the input voltage of the power supply reaches the starting voltage of the discharge circuit or not; the reset controller is connected with the grid electrode of the fourth switching tube and used for controlling the disconnection or connection of the fourth switching tube.
Optionally, in an embodiment of the present invention, the reset controller includes a reset output pin, and the reset output pin is connected to the gate of the fourth switching tube; the reset controller controls the disconnection or connection of the fourth switching tube through the reset output pin.
Optionally, in an embodiment of the present invention, the first voltage detection module includes: the first voltage dividing resistor and the first delay capacitor; the first voltage dividing resistor is used for detecting the power input voltage; the first delay capacitor is used for setting the first delay time.
Optionally, in an embodiment of the present invention, the soft start circuit further includes: the device comprises a second voltage detection module, a current detection module and a soft start controller; the second voltage detection module is connected with the switch circuit, the power supply and the soft start controller and is used for detecting whether the input voltage of the power supply reaches the starting voltage of the soft start circuit or not; the current detection module is connected with the third switching tube, the power supply and the soft start controller and is used for detecting the input current of the power supply and sending the detected input current of the power supply to the soft start controller; the soft start controller is connected with the third switching tube and used for controlling the third switching tube to be disconnected or connected according to the power supply input current.
Optionally, in an embodiment of the present invention, the second voltage detection module includes: the second voltage-dividing resistor and the second delay capacitor; the second voltage dividing resistor is used for detecting the power input voltage; the second delay capacitor is used for setting the second delay time.
Optionally, in an embodiment of the present invention, an on voltage of the soft start circuit is higher than an on voltage of the discharge circuit.
Optionally, in an embodiment of the present invention, a gate of the third switching tube is connected to the soft start controller, a source of the third switching tube is connected to the external device, and a drain of the third switching tube is connected to the current detection module.
Optionally, in an embodiment of the present invention, the soft start controller includes: the soft start output pin is connected with the grid electrode of the third switching tube; the switch pin is connected with the drain electrode of the first switch tube through the second voltage detection module.
The invention realizes the functions of time delay starting, soft starting and starting pre-discharge, and fully ensures the safe starting in different occasions. An active discharging process for a period of time is added in the starting process of power supply, so that the external equipment is ensured to be started after being fully discharged, and the problem of disordered starting time sequence caused by charge accumulation is avoided. The delay starting function can flexibly adjust the delay starting time according to actual conditions so as to facilitate the unstable power supply condition at the initial stage of staggered starting. By soft start control, the supply voltage can be pulled down by limiting the start-up current and suppressing the surge effect caused by the excessive load capacitance. Therefore, the starting process is safer, and the coverage range is wider.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the description below are only some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power safe starting system according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a power safe start-up system according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a power safe start-up system according to another embodiment of the present invention;
fig. 4 is a timing diagram of a power safe start system according to an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a power supply safety starting system.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a power safety starting system according to an embodiment of the present invention, where the power safety starting system includes: a switch circuit 11, a discharge circuit 12, and a soft start circuit 13; the switch circuit 11 is connected between a power supply and an external device, the discharge circuit 12 is connected with the power supply and the switch circuit 11, and the soft start circuit 13 is connected with the power supply, the switch circuit 11 and the external device;
The switch circuit 11 comprises a first switch tube and a second switch tube; the first switching tube is connected with the power supply, the discharging circuit 12 and the soft start circuit 13, and the second switching tube is connected with the power supply, the discharging circuit and the external equipment;
after the power supply is turned on, when the power supply input voltage reaches the turn-on voltage of the discharge circuit 12, the discharge circuit 12 controls the first switching tube and the second switching tube to be turned on within a preset first delay time, so that the external equipment discharges through the second switching tube within the first delay time;
After the first delay time, the discharging circuit 12 controls the first switching tube and the second switching tube to be disconnected;
after a preset second delay time, the soft start circuit 13 controls the third switching tube to be turned on gradually, so that the power supply can supply power to the external device gradually.
In this embodiment, the power safety start system is connected between the power supply and the external device. During power up, after power is input, the discharge circuit 12 first reaches a turn-on voltage to operate. The discharging circuit 12 controls the first switching tube and the second switching tube in the switching circuit 11 to be conducted, and the conducting time is a preset first delay time. In the first delay time, the external equipment discharges to the ground through the second switch tube, so that the problem of starting time sequence disorder caused by residual charges in the external equipment is avoided.
In the first delay time, after the external device sufficiently releases the residual charge through the second switching tube, the discharging circuit 12 controls the first switching tube to be disconnected from the second switching tube, and the external device stops discharging. After the first switching tube is disconnected, and when the output voltage of the power supply reaches the starting voltage of the soft start circuit 13, the soft start circuit starts to work, and after a preset second delay time, the soft start circuit 13 starts a soft start process. The soft start circuit 13 is provided with a third switching tube, and after the soft start circuit 13 starts a soft start process, the third switching tube is controlled to be gradually conducted. Through the soft start process, the power supply gradually supplies power to the external equipment, so that the surge effect in the system can be avoided, and the power supply can supply power to the external equipment stably.
Wherein the first delay time is greater than the second delay time in order to ensure that the soft start circuit 13 does not output during the first delay time.
As an embodiment of the present invention, the power safety starting system further includes a filter circuit 14, where the filter circuit 14 is connected to the power supply, the discharging circuit 12 and the soft start circuit 11. The filter circuit 14 is used for filtering the power supply input current.
As an embodiment of the present invention, the gate of the first switching tube is connected to the gate of the second switching tube, the discharging circuit 12 and the power supply, the drain of the first switching tube is connected to the soft start circuit 13, and the source of the first switching tube is grounded. The switching tube may be, for example, a field effect tube, and then the switching tube includes a source electrode, a gate electrode and a drain electrode. The discharging circuit 12 is connected to the gate of the first switching tube and the gate of the second switching tube, and controls the on/off of the first switching tube and the second switching tube.
As one embodiment of the invention, the source electrode of the second switching tube is grounded, and the drain electrode of the second switching tube is connected with external equipment; when the second switching tube is turned on, the external device discharges to the ground through the second switching tube. When the discharge circuit 12 controls the second switching tube to be turned on, the external device discharges to the ground through the source of the second switching tube.
As an embodiment of the present invention, the switching circuit 11 further includes a fourth switching tube, a source electrode of the fourth switching tube is grounded, a drain electrode of the fourth switching tube is connected to a gate electrode of the first switching tube and a gate electrode of the second switching tube, and a gate electrode of the fourth switching tube is connected to the discharge circuit 12.
In this embodiment, the discharging circuit 12 controls the fourth switching tube to be turned off in the first delay time, so that the first switching tube and the second switching tube are turned on in the first delay time.
When the fourth switching tube is not needed, the effective output of the connection part of the discharging circuit 12 and the grid electrodes of the first switching tube and the second switching tube is high level. If the effective output of the connection part of the discharging circuit 12 and the grid electrodes of the first switching tube and the second switching tube is low level, the discharging circuit 12 is connected with the grid electrode of the fourth switching tube to control the disconnection of the fourth switching tube in the first delay time, so that the first switching tube and the second switching tube are controlled to be conducted.
In the present embodiment, the discharge circuit 12 includes: the first voltage detection module and the reset controller; the voltage detection module is connected with the power supply and the reset controller and is used for detecting whether the input voltage of the power supply reaches the starting voltage of the discharge circuit 12; the reset controller is connected with the grid electrode of the fourth switching tube and used for controlling the disconnection or the connection of the fourth switching tube.
The reset controller comprises a reset output pin which is connected with the grid electrode of the fourth switching tube; the reset controller controls the disconnection or connection of the fourth switching tube through a reset output pin. At this time, the effective output of the reset output pin of the reset controller is low level. When the effective output of the reset output pin of the reset controller is at a high level, the reset output pin can be directly connected with the gates of the first switch tube and the two switch tubes.
Further, the first voltage detection module includes: the first voltage dividing resistor and the first delay capacitor; the first voltage dividing resistor is used for detecting the input voltage of the power supply; the first delay capacitor is used for setting a first delay time. The first voltage dividing resistor comprises two resistors, so that voltage division is realized. By setting the two resistances to different values, the turn-on voltages of the discharge circuits 12 can be set to different values. When the power supply input voltage reaches the on voltage, the discharge circuit 12 starts to operate. By setting different capacitance values of the first delay capacitance, different first delay times can be set.
As an embodiment of the present invention, the soft start circuit 13 further includes: the device comprises a second voltage detection module, a current detection module and a soft start controller; the second voltage detection module is connected with the switch circuit 11, the power supply and the soft start controller and detects whether the input voltage of the power supply reaches the starting voltage of the soft start circuit; the current detection module is connected with the third switching tube, the power supply and the soft start controller and is used for detecting the input current of the power supply and sending the detected input current of the power supply to the soft start controller; the soft start controller is connected with the third switching tube and used for controlling the disconnection or the connection of the third switching tube according to the input current of the power supply.
The current detection module can detect the current magnitude on the current power supply line, namely the magnitude of the power supply output current. The soft start circuit 13 controls the conduction degree of the third switching tube through the current value sent by the current detection module, so as to realize soft start.
In this embodiment, the second voltage detection module includes: the second voltage-dividing resistor and the second delay capacitor; the second voltage dividing resistor is used for detecting the input voltage of the power supply; the second delay capacitor is used for setting a second delay time. The second voltage dividing resistor comprises two resistors, so that voltage division is realized. By setting the different resistances of the two resistors, the turn-on voltages of the different soft start circuits 13 can be set. When the power supply input voltage reaches the on voltage, the soft start circuit 13 starts to operate. By setting different capacitance values of the second delay capacitance, different second delay times can be set.
Wherein the turn-on voltage of the soft start circuit 13 is higher than the turn-on voltage of the discharge circuit 12. In order to ensure that the discharge circuit 12 can operate prior to the soft start circuit 13 during power-up, the turn-on voltage of the discharge circuit 12 is lower than the turn-on voltage of the soft start circuit 13.
In this embodiment, the gate of the third switching tube is connected to the soft start controller, the source of the third switching tube is connected to the external device, and the drain of the third switching tube is connected to the current detection module.
Wherein, the soft start controller includes: the soft start output pin is connected with the grid electrode of the third switching tube; the switch pin is connected with the drain electrode of the first switch tube through the second voltage detection module. When the first switching tube is disconnected, the switch pin of the soft start controller is pulled high, and the soft start controller starts to work at the moment. After the soft start controller starts working, the soft start controller controls the output of the soft start output pin according to the power supply output current, so as to control the third switching tube to be gradually conducted. After the third switching tube is conducted, the power supply directly supplies power to external equipment through the third switching tube.
The power supply safety starting system mainly comprises three parts: a switching circuit, a soft start circuit and a discharge circuit. The soft start circuit internally comprises a voltage detection circuit (a second voltage detection module), a current detection circuit, a switch control circuit (a third switch tube), a delay start circuit (the second voltage detection module) and a main logic control circuit (a soft start controller). The main logic control circuit can be completed as an integrated chip, and the current detection circuit and the switch control circuit are connected with the power supply line and simultaneously connected to the main logic control circuit. The voltage detection circuit is used for acquiring an input voltage value, comparing the input voltage value with an internal reference voltage, and closing the controller to cut off output when the voltage is abnormal. The current detection circuit is used for detecting the current condition of the main power supply loop so as to control the switch to realize soft start according to the current condition. The discharging circuit part further comprises a delay starting circuit, a voltage detection circuit (a first voltage detection module) and a control circuit (a reset controller). The control circuit mainly comprises a reset chip and is matched with an external switch circuit to realize the discharging and resetting functions. After starting, the power supply of the board card is grounded through the switch circuit so as to be convenient for full discharge. And after a certain time delay, the discharge passage is disconnected. In addition, the input end outputs a reset signal to reset the system if voltage drop is detected. In order to prevent the output of the soft start circuit and the discharge circuit from forming a short circuit in the resetting process, the reset output side of the discharge circuit is required to simultaneously turn off the soft start circuit to cut off the power supply switch.
FIG. 2 is a circuit diagram of a power safe starting system according to an embodiment of the invention, wherein D1 and C1 form a filter circuit; soft start circuit: the hot plug controller is a soft start controller, wherein Gate is a soft start output pin, ON is a switch pin, R1 forms a current detection module, Q3 is a third switch tube, R5, R7, C5 and C4 form a second voltage detection module, C5 is a second delay capacitor, and R5 and R7 are second voltage dividing resistors; and a discharge circuit: the reset chip is a reset controller, wherein RST is a reset output pin, R11, R12, C9 and C10 form a first voltage detection module, wherein C9 is a first delay capacitor, and R11 and R12 are first voltage dividing resistors; and a switching circuit: r8, R9, R10, Q1 and Q2 form a switching circuit, wherein Q1 is a first switching tube, and Q2 is a second switching tube.
In this embodiment, the soft start circuit uses a hot plug controller and the discharge circuit uses a reset IC chip. The power supply input Vcc passes through the protection diode D1 to the ground, and then supplies power to the system through the filter capacitor C1, and the power supply circuit is divided into two branches A and B. The A branch connects resistors R1 and Q3 (NMOS) in series to the power supply output C. The left end and the right end of the R1 are respectively connected to Vcc pins and Sense pins of the hot plug controller and are used for detecting power supply current. The Gate of Q3 is connected with the Gate pin of the hot plug controller. The Gate pin can control the on-off of the Q3 to realize the control of the power supply current. The switch pins (ON/OFF) of the hot plug controller are derived from the division of Vcc by R5 and R7. The hot plug controller has a delay starting function, and the time of the delay is regulated by a capacitor C5 externally connected with the ground.
The power supply B branch is connected to the discharging circuit, the discharging circuit is controlled by a reset IC, the B branch is connected to the Vdd power supply pin of the reset IC after being filtered by C8, the B branch power supply is connected to the SENSE pin of the reset chip through the serial voltage division of R11 and R12, and the SENSE pin is filtered to the ground by C10. The reset chip has a delay starting function, and the delay time is regulated by a capacitor C9 externally connected to the ground. The reset output pin (RST) of the reset chip is connected to the gates (D point) of Q1 and Q2, wherein the D point is connected in series with a resistor R9 to the power supply Vcc, the D point is connected to the gate of Q2 through a series R10, and the sources of Q1 and Q2 are respectively grounded. The drain electrode of the Q1 is connected to the switch pin of the hot plug controller, and the drain electrode of the Q2 is connected to the power supply output end C point through the series connection R8.
In the working process, the voltage dividing resistors R5, R7, R11 and R12 of the hot plug controller and the reset chip are adjusted according to the characteristics of the hot plug controller and the reset chip. To ensure that the turn-on voltage Vt1 of the discharge circuit is less than the turn-on voltage Vt2 of the soft start circuit, the C5 and C9 are sized such that the delay time of the two parts is within a suitable range, assuming T1 and T2, respectively. In the power-on process, a control chip of the discharging circuit works first, the RST pin is always high within the time T1, the Q2 is closed, the C point is grounded through the R8, and the discharging to the ground is performed if charges exist in external equipment. Reducing R8 can achieve a rapid discharge operation. The setting of T1 is to ensure that the power failure is sufficient. During T1, Q1 is also closed so that the hot plug controller ON/OFF pin is continuously low, so the hot plug controller Gate pin remains low and Q3 is an open state. The process system is in a discharge state before power-up at T1. After T1, RST pulls down, D point is low level, Q1 and Q2 disconnection, ON pin becomes high level, and hot plug controller begins to work this moment, waits for after the moment of T2, and hot plug controller begins to control Gate pin high level in order to switch ON Q3 and realize voltage output, until the system is stable. The hot plug controller has a soft start control function, namely, the controller can control the current not to exceed a preset current value by detecting the voltage of the Gate through the electrokinetic adjustment of R1. Thus, surge current in the starting stage can be effectively restrained, and impact on the system is reduced.
During the power failure process, the soft start circuit first detects a voltage drop and immediately turns off the power supply switch Q3. At this time, the discharging circuit can work briefly due to the existence of the capacitor, and the discharging action can be output immediately after the voltage is reduced to the Sense voltage until the power supply voltage is insufficient.
Fig. 3 is a circuit diagram of a power safe start-up system according to another embodiment of the present invention, wherein the active output of the reset output pin is #rst, i.e., active low. At this time, the switching circuit further includes a fourth switching tube Q4. The reset output pin (#RST) of the reset chip is connected to the gate of Q4, the source terminal of Q4 is grounded, the drain terminal (D point) is connected to the gate of Q1, the D point is connected in series with a resistor R9 to the power supply Vcc, the D point is connected to the gate of Q2 through a series connection R10, and the sources of Q2 and Q3 are respectively grounded. In the power-on process, the control chip of the discharging circuit works first, the pin # RST is always low within the time T1, Q4 is opened, and Q2 and Q1 are closed. After T1 goes high, # RST, Q4 is closed, D is low, Q1 and Q2 are open, and the ON pin goes high. At this time, the hot plug controller starts to work, and after waiting for the time T2, the hot plug controller starts to control the high level of the Gate pin to conduct Q3 so as to realize voltage output until the system is stable.
Fig. 4 is a timing chart of a power safety starting system according to an embodiment of the present invention, and in particular, fig. 4 is a timing chart corresponding to a connection point of an a branch and a B branch, a #rst pin of a reset chip, and a Gate pin of a hot plug controller in a power-up and power-down process of the power safety starting system of fig. 3. As can be seen from FIG. 4, the connection point of the A branch and the B branch, the #RST pin of the reset chip and the Gate pin of the hot plug controller are all low voltages before the system is powered on. In the power-on process, the voltage of the connection point of the branch A and the branch B gradually rises, the discharge circuit starts to work after reaching the starting voltage at the moment t1, the # RST pin of the reset chip becomes high level at the moment t3, namely, the power-on starts to the moment t3, the discharge process of the system is performed, the external equipment discharges to the ground through a switch tube in the switch circuit, and then t 1-t 3 are the first delay time of the discharge circuit. The soft start circuit reaches the starting voltage at the time t2, and the soft start circuit cannot start to work immediately because a switching tube in the switching circuit is connected with a switching pin of a hot plug controller of the soft start circuit. The soft start circuit starts to work at the time t3, and t3 to t4 are the second delay time of the soft start circuit. After the second delay time, the soft start circuit starts a soft start process, and the voltage of the Gate pin gradually rises in a short time so as to gradually conduct the power supply switching tube (the third switching tube). In the power failure process, the soft start circuit detects voltage drop at time t5 first, and the switching tube is closed to stop the power supply. The discharging circuit can work briefly between t5 and t6 due to the existence of the capacitor, and the discharging action can be output immediately after the voltage is reduced to the voltage of the Sense pin of the hot plug controller until the power supply voltage is insufficient.
The voltage safety starting system provided by the invention realizes the functions of time delay starting, soft starting and starting pre-discharge, and fully ensures the safety starting in different occasions. An active discharging process for a period of time is added in the starting process of power supply, so that the external equipment is ensured to be started after being fully discharged, and the problem of disordered starting time sequence caused by charge accumulation is avoided. The delay starting function can flexibly adjust the delay starting time according to actual conditions so as to facilitate the unstable power supply condition at the initial stage of staggered starting. By soft start control, the supply voltage can be pulled down by limiting the start-up current and suppressing the surge effect caused by the excessive load capacitance. Therefore, the starting process is safer, and the coverage range is wider.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (12)
1. A power safe start-up system, the power safe start-up system comprising: a switching circuit, a discharging circuit and a soft start circuit; the switch circuit is connected between a power supply and external equipment, the discharge circuit is connected with the power supply and the switch circuit, and the soft start circuit is connected with the power supply, the switch circuit and the external equipment;
The switching circuit comprises a first switching tube and a second switching tube; the first switching tube is connected with the power supply, the discharging circuit and the soft starting circuit, and the second switching tube is connected with the power supply, the discharging circuit and the external equipment;
after the power supply is started, when the power supply input voltage reaches the starting voltage of the discharging circuit, the discharging circuit controls the first switching tube and the second switching tube to be conducted within a preset first delay time, so that the external equipment discharges through the second switching tube within the first delay time;
After the first delay time, the discharging circuit controls the first switching tube and the second switching tube to be disconnected;
after a second delay time is preset, the soft start circuit controls the third switching tube to be conducted gradually, so that the power supply can supply power to the external equipment gradually; the soft start circuit is provided with a third switching tube, and the third switching tube is controlled to be gradually conducted after the soft start circuit starts a soft start process;
the system further comprises a filter circuit, wherein the filter circuit is connected with the power supply, the discharging circuit and the soft start circuit;
The grid electrode of the first switching tube is connected with the grid electrode of the second switching tube, the discharging circuit and the power supply, the drain electrode of the first switching tube is connected with the soft starting circuit, and the source electrode of the first switching tube is grounded.
2. The power safe starting system according to claim 1, wherein a source electrode of the second switching tube is grounded, and a drain electrode of the second switching tube is connected with the external device; when the second switching tube is turned on, the external device discharges to the ground through the second switching tube.
3. The power safe starting system according to claim 1, wherein the switching circuit further comprises a fourth switching tube, a source electrode of the fourth switching tube is grounded, a drain electrode of the fourth switching tube is connected with a gate electrode of the first switching tube and a gate electrode of the second switching tube, and a gate electrode of the fourth switching tube is connected with the discharging circuit.
4. The power safe starting system of claim 3, wherein the discharge circuit controls the fourth switching tube to be turned off during the first delay time to turn on the first switching tube and the second switching tube during the first delay time.
5. The power safe start-up system of claim 4, wherein the discharge circuit comprises: the first voltage detection module and the reset controller;
The voltage detection module is connected with the power supply and the reset controller and is used for detecting whether the input voltage of the power supply reaches the starting voltage of the discharge circuit or not;
The reset controller is connected with the grid electrode of the fourth switching tube and used for controlling the disconnection or connection of the fourth switching tube.
6. The power safe starting system of claim 5, wherein the reset controller comprises a reset output pin connected to the gate of the fourth switching tube; the reset controller controls the disconnection or connection of the fourth switching tube through the reset output pin.
7. The power safe start-up system of claim 5, wherein the first voltage detection module comprises: the first voltage dividing resistor and the first delay capacitor;
the first voltage dividing resistor is used for detecting the power input voltage;
the first delay capacitor is used for setting the first delay time.
8. The power safe start-up system of claim 1, wherein the soft start circuit further comprises: the device comprises a second voltage detection module, a current detection module and a soft start controller;
The second voltage detection module is connected with the switch circuit, the power supply and the soft start controller and is used for detecting whether the input voltage of the power supply reaches the starting voltage of the soft start circuit or not;
The current detection module is connected with the third switching tube, the power supply and the soft start controller and is used for detecting the input current of the power supply and sending the detected input current of the power supply to the soft start controller;
The soft start controller is connected with the third switching tube and used for controlling the third switching tube to be disconnected or connected according to the power supply input current.
9. The power safe start-up system of claim 8, wherein the second voltage detection module comprises: the second voltage-dividing resistor and the second delay capacitor;
The second voltage dividing resistor is used for detecting the power input voltage;
the second delay capacitor is used for setting the second delay time.
10. The power safe starting system of claim 8, wherein the turn-on voltage of the soft start circuit is higher than the turn-on voltage of the discharge circuit.
11. The power safe starting system according to claim 8, wherein a gate of the third switching tube is connected with the soft start controller, a source of the third switching tube is connected with the external device, and a drain of the third switching tube is connected with the current detection module.
12. The power safe start-up system of claim 8, wherein the soft start controller comprises: the soft start output pin is connected with the grid electrode of the third switching tube; the switch pin is connected with the drain electrode of the first switch tube through the second voltage detection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901314.7A CN109067161B (en) | 2018-08-09 | 2018-08-09 | Power supply safety starting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901314.7A CN109067161B (en) | 2018-08-09 | 2018-08-09 | Power supply safety starting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109067161A CN109067161A (en) | 2018-12-21 |
| CN109067161B true CN109067161B (en) | 2024-07-30 |
Family
ID=64683132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810901314.7A Active CN109067161B (en) | 2018-08-09 | 2018-08-09 | Power supply safety starting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109067161B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113573757B (en) * | 2019-03-29 | 2024-05-03 | 泰尔茂株式会社 | Liquid medicine throwing device |
| CN112713579A (en) * | 2020-12-09 | 2021-04-27 | 青岛海尔空调电子有限公司 | Control method and system of anti-surge circuit and air conditioning equipment |
| CN113675830B (en) * | 2021-10-20 | 2022-02-18 | 苏州浪潮智能科技有限公司 | Hot plug device and input voltage overshoot suppression protection circuit thereof |
| CN114253381A (en) * | 2021-12-23 | 2022-03-29 | 厦门四信通信科技有限公司 | Electronic equipment and abnormal reset circuit thereof |
| CN116231607B (en) * | 2023-02-20 | 2023-12-05 | 北京中捷时代航空科技有限公司 | Transient current suppression circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208401734U (en) * | 2018-08-09 | 2019-01-18 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5057748A (en) * | 1989-10-16 | 1991-10-15 | Everbrite, Inc. | Power supply circuit for gas discharge tube |
| CN1221078C (en) * | 2003-09-25 | 2005-09-28 | 联想(北京)有限公司 | Surge current preventing and time sequence controlling device and method for thermal connect-disceonnect electronic equipment |
| KR100967029B1 (en) * | 2008-06-03 | 2010-06-30 | 삼성전기주식회사 | Regulator with soft start |
| CN102130600B (en) * | 2011-03-28 | 2013-02-27 | 张家港华峰电接插元件有限公司 | Serial resonant switching power supply |
| JP5857595B2 (en) * | 2011-09-30 | 2016-02-10 | サンケン電気株式会社 | Soft start circuit |
| CN102969782B (en) * | 2012-10-26 | 2015-02-25 | 深圳市英威腾电气股份有限公司 | Chip starting circuit |
| CN103869742A (en) * | 2012-12-18 | 2014-06-18 | 鸿富锦精密工业（深圳）有限公司 | Circuit for controlling sequential starting of multiple pieces of equipment |
| CN203151810U (en) * | 2013-01-22 | 2013-08-21 | 上海鸣志自动控制设备有限公司 | LED drive hot-plug control circuit |
| CN103280962B (en) * | 2013-06-20 | 2015-10-28 | 帝奥微电子有限公司 | A kind of short circuit recovers soft starting circuit |
| CN103904874B (en) * | 2014-03-11 | 2018-04-24 | 许继电气股份有限公司 | A kind of time-delay soft start circuit for BOOST-PFC |
| CN104022489B (en) * | 2014-06-30 | 2017-06-20 | 中国电子科技集团公司第四十三研究所 | With the power source short-circuit protection system and method restarted automatically with soft start function |
| CN104201652B (en) * | 2014-09-10 | 2017-02-15 | 广州金升阳科技有限公司 | Power protection control method |
| CN107769535B (en) * | 2016-08-22 | 2021-03-30 | 中兴通讯股份有限公司 | Slow starting circuit, power panel comprising same and service single board |
-
2018
- 2018-08-09 CN CN201810901314.7A patent/CN109067161B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208401734U (en) * | 2018-08-09 | 2019-01-18 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109067161A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109067161B (en) | Power supply safety starting system | |
| US10096994B2 (en) | Transient-triggered DC voltage-sustained power-rail ESD clamp circuit | |
| US20190138071A1 (en) | Hot plug module power supply device, method and system | |
| TW201010229A (en) | Technique for combing in-rush current limiting and short circuit current limiting | |
| JP2002538751A (en) | Independently adjustable dual-level current threshold | |
| US10109998B2 (en) | ESD protection circuit with two discharge time periods | |
| US20090243669A1 (en) | Power-on reset circuit | |
| TWI463796B (en) | Method and device for delaying activation timing of output device | |
| TW201724681A (en) | Power supply device | |
| US10187055B2 (en) | Output discharge techniques for load switches | |
| US20060158811A1 (en) | Protection circuit | |
| CN109842401B (en) | Latch-up resistant device and CMOS chip | |
| CN104578744B (en) | Load stepped starting circuit and corresponding earth leakage protective device | |
| US20200185911A1 (en) | Fuse having parallel transorb device with switch | |
| CN216052961U (en) | Power-down time sequence control circuit | |
| CN109164746A (en) | A kind of lower electric sequential control circuit and power circuit | |
| KR200469552Y1 (en) | Apparatus for preventing in-rush current | |
| US9997925B2 (en) | Power supplying method and device thereof | |
| US9455565B2 (en) | Protection circuit that detects fault impedance during power up of a device | |
| US7218537B2 (en) | In-rush current limiter | |
| US10908665B2 (en) | Maintaining proper voltage sequence during sudden power loss | |
| CN208401734U (en) | A kind of power safety activation system | |
| CN107241014A (en) | Single-ion transient state effect for SCR pulse width modulators resists circuit | |
| CN209014942U (en) | A kind of lower electric sequential control circuit and power circuit | |
| CN104391757A (en) | Protecting circuit for preventing continuous damage and implementation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |