CN208401734U - A kind of power safety activation system - Google Patents
A kind of power safety activation system Download PDFInfo
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- CN208401734U CN208401734U CN201821278810.3U CN201821278810U CN208401734U CN 208401734 U CN208401734 U CN 208401734U CN 201821278810 U CN201821278810 U CN 201821278810U CN 208401734 U CN208401734 U CN 208401734U
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Abstract
The utility model provides a kind of power safety activation system, which includes: switching circuit, discharge circuit and soft starting circuit；Switching circuit is connected between power supply and external equipment, and discharge circuit is connect with power supply and switching circuit, and soft starting circuit is connect with switching circuit and external equipment；Switching circuit includes first switch tube and second switch；First switch tube is connect with power supply, discharge circuit and soft starting circuit, and second switch is connect with discharge circuit and external equipment；When power input voltage reaches the cut-in voltage of discharge circuit, discharge circuit control first switch tube and second switch are connected in default first delay time, so that external equipment is discharged by second switch；After the first delay time, discharge circuit controls first switch tube and second switch disconnects；After default second delay time, soft starting circuit controls its third switching tube and is gradually connected, and powers so that power supply is done step-by-step to external equipment.
Description
Technical field
The utility model relates to power initiation field, espespecially a kind of power safety activation system.
Background technique
With the development of science and technology, electronic technology is grown rapidly, and electronics categories are more and more abundant, in the mankind
Irreplaceable role is played in life.It is also less identical to the reliability requirement of product with the difference of product use environment.
The power up of one electronic system is very big to the reliability effect of product.For example, some electronic products using when need soft open
It is dynamic, to protect electronic product on startup not by the impact of surge.Some equipment is used for industrial scene, and use environment compares
Badly, especially more equipment concentrate spread of voltage in the start-up course powered on, then need delayed startup to circumvent shakiness at this time
Determine process, while to detect voltage fluctuation, then must effectively be resetted if there is undervoltage condition.There are many technologies at present
Delayed startup or soft start are realized using discrete device, are also occurred some integrated chips with advances in technology and are realized soft open
It is dynamic.However the clean boot of equipment will not only escape surge and voltage instability, the abundant power down before starting is also very crucial, and single
One chip is not able to satisfy a variety of applications.
Utility model content
In order to solve the problems, such as that current device power process not can be implemented simultaneously soft start, delay and sufficiently power down etc., this
Utility model provides a kind of power safety activation system, the power safety activation system include: switching circuit, discharge circuit and
Soft starting circuit；The switching circuit is connected between power supply and external equipment, the discharge circuit and the power supply and described
Switching circuit connection, the soft starting circuit are connect with the power supply, the switching circuit and the external equipment；
The switching circuit includes first switch tube and second switch；It is the first switch tube and the power supply, described
Discharge circuit and soft starting circuit connection, the second switch and the power supply, the discharge circuit and the outside
Equipment connection；
After the electric power starting, when power input voltage reaches the cut-in voltage of the discharge circuit, the electric discharge
First switch tube described in circuit control and the second switch are connected in default first delay time, so that the outside is set
For in first delay time, discharged by the second switch；
After first delay time, the discharge circuit controls the first switch tube and second switch is disconnected
It opens；
After default second delay time, the soft starting circuit controls its third switching tube and is gradually connected, so that institute
Power supply is stated to be done step-by-step to external equipment power supply.
Optionally, in an embodiment of the utility model, the system also includes filter circuit, the filter circuit and institutes
State power supply, the discharge circuit and soft starting circuit connection.
Optionally, in an embodiment of the utility model, the grid of the first switch tube and the second switch
Grid, the discharge circuit and power supply connection, the drain electrode of the first switch tube is connect with the soft starting circuit, described
The source electrode of first switch tube is grounded.
Optionally, in an embodiment of the utility model, the source electrode ground connection of the second switch, the second switch
Drain electrode connect with the external equipment；When second switch conducting, the external equipment passes through the second switch
Pipe discharges to ground.
Optionally, in an embodiment of the utility model, the switching circuit further includes the 4th switching tube, and the described 4th opens
Close the source electrode ground connection of pipe, drain electrode and the grid of the first switch tube and the grid of the second switch of the 4th switching tube
Pole connection, the grid of the 4th switching tube are connect with the discharge circuit.
Optionally, in an embodiment of the utility model, the discharge circuit controls the 4th switching tube described the
It is disconnected in one delay time, so that the first switch tube and second switch are connected in first delay time.
Optionally, in an embodiment of the utility model, first voltage detection module and reset controller；The voltage inspection
It surveys module to connect with the power supply and the reset controller, for detecting whether the power input voltage reaches the electric discharge
The cut-in voltage of circuit；The reset controller is connect with the grid of the 4th switching tube, for controlling the 4th switch
The disconnection or conducting of pipe.
Optionally, in an embodiment of the utility model, the reset controller includes resetting output pin, the reset
Output pin is connect with the grid of the 4th switching tube；The reset controller passes through described in reset output pin control
The disconnection or conducting of 4th switching tube.
Optionally, in an embodiment of the utility model, the first voltage detection module include: the first divider resistance with
First delay capacitor；First divider resistance is for detecting the power input voltage；First delay capacitor is for setting
Set first delay time.
Optionally, in an embodiment of the utility model, the soft starting circuit further include: second voltage detection module,
Current detection module and soft start controller；The second voltage detection module and the switching circuit, the power supply and described
Soft start controller connection, detects the cut-in voltage whether power input voltage reaches the soft starting circuit；The electricity
Stream detection module is connect with the third switching tube, the power supply and the soft start controller, for detecting power input electricity
It flows and the mains input current that will test is sent to the soft start controller；The soft start controller is opened with the third
Pipe connection is closed, for controlling the disconnection or conducting of the third switching tube according to the mains input current.
Optionally, in an embodiment of the utility model, the second voltage detection module include: the second divider resistance and
Second delay capacitor；Second divider resistance is for detecting the power input voltage；Second delay capacitor is for setting
Set second delay time.
Optionally, in an embodiment of the utility model, the cut-in voltage of the soft starting circuit is higher than the electric discharge electricity
The cut-in voltage on road.
Optionally, in an embodiment of the utility model, the grid of the third switching tube and the soft start controller
Connection, the source electrode of the third switching tube are connect with the external equipment, and the drain electrode of the third switching tube and the electric current are examined
Survey module connection.
Optionally, in an embodiment of the utility model, the soft start controller includes: soft start output pin and opens
Pin is closed, the soft start output pin is connect with the grid of the third switching tube；The switch pin passes through described second
Voltage detection module is connect with the drain electrode of the first switch tube.
The utility model realizes delayed startup, soft start, starting pre-arcing function, fully ensures that the safety in different occasions
Starting.The active discharge process that joined a period of time in the start-up course of power supply, after guaranteeing that external equipment is substantially discharged
Restart, avoids because starting timing entanglement problem caused by charge accumulated.Delayed startup function can be according to the actual situation
Start-up time delay is adjusted flexibly, in order to the unstable situation of the power supply for the initial start stage that is staggered.It can be led to by soft start control
Cross limiting starting current, inhibit due to load capacitance it is excessive caused by surge effect and supply voltage is dragged down.It is achieved in and opens
Dynamic process is safer, and coverage area is wider.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of power safety activation system of the utility model embodiment；
Fig. 2 is the power safety activation system circuit diagram of one specific embodiment of the utility model；
Fig. 3 is the power safety activation system circuit diagram of the utility model another specific embodiment；
Fig. 4 is a kind of timing diagram of power safety activation system of the utility model embodiment.
Specific embodiment
The utility model embodiment provides a kind of power safety activation system.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
It is as shown in Figure 1 a kind of structural schematic diagram of power safety activation system of the utility model embodiment, as shown in the figure
Power safety activation system includes: switching circuit 11, discharge circuit 12 and soft starting circuit 13；The switching circuit 11 is connected to
Between power supply and external equipment, the discharge circuit 12 is connect with the power supply and the switching circuit 11, the soft start electricity
Road 13 is connect with the power supply, the switching circuit 11 and the external equipment；
The switching circuit 11 includes first switch tube and second switch；The first switch tube and the power supply, institute
It states discharge circuit 12 and the soft starting circuit 13 connects, the second switch and the power supply, the discharge circuit and institute
State external equipment connection；
It is described to put when power input voltage reaches the cut-in voltage of the discharge circuit 12 after the electric power starting
Circuit 12 controls the first switch tube and the second switch and is connected in default first delay time, so that described outer
Portion's equipment is discharged in first delay time by the second switch；
After first delay time, the discharge circuit 13 controls the first switch tube and second switch is disconnected
It opens；
After default second delay time, the soft starting circuit 13 controls its third switching tube and is gradually connected, so that
The power supply is done step-by-step to the external equipment and powers.
In the present embodiment, power safety activation system is connected between power supply and external equipment.In power up, electricity
After the input of source, discharge circuit 12 reaches cut-in voltage first and works.First in 12 control switch circuit 11 of discharge circuit
Switching tube is connected with second switch, and turn-on time is preset first delay time.In the first delay time, outside is set
It is standby to be discharged by second switch to ground, with this avoid due in external equipment there are residual charge, when caused starting
Sequence entanglement problem.
In the first delay time, after external equipment is sufficiently discharged residual charge by second switch, electric discharge
Circuit 12 controls first switch tube and second switch disconnects, and external equipment stops electric discharge.After first switch tube disconnection, and electricity
When the output voltage in source reaches the cut-in voltage of soft starting circuit 13, soft starting circuit is started to work, using preset second
After delay time, soft starting circuit 13 starts soft start-up process.Third switching tube is equipped in soft starting circuit 13, in soft start electricity
After road 13 starts soft start-up process, control third switching tube is gradually turned on.By soft start-up process, power supply is gradually to external equipment
Power supply can realize that power good is powered to external equipment to avoid occurring surge effect in system.
Wherein, in order to guarantee that soft starting circuit 13 does not export in the first delay time, the first delay time is greater than
Two delay times.
As one embodiment of the utility model, power safety activation system further includes filter circuit 14, filter circuit
14 connect with power supply, discharge circuit 12 and soft starting circuit 11.Filter circuit 14 is for being filtered place to mains input current
Reason.
As one embodiment of the utility model, the grid of first switch tube and grid, the electric discharge electricity of second switch
Road 12 and power supply connection, the drain electrode of first switch tube are connect with soft starting circuit 13, the source electrode ground connection of first switch tube.Wherein,
Switching tube can be such as field-effect tube, then, switching tube includes source electrode, grid and drain electrode.Discharge circuit 12 is by with first
The grid of switching tube and the grid connection of second switch, control the on-off of first switch tube and second switch.
As one embodiment of the utility model, the source electrode of second switch is grounded, the drain electrode of second switch and outer
The connection of portion's equipment；When second switch conducting, external equipment is discharged by second switch to ground.Wherein, it is discharging
When circuit 12 controls second switch conducting, external equipment is discharged by the source electrode of second switch to ground.
As one embodiment of the utility model, switching circuit 11 further includes the 4th switching tube, the source of the 4th switching tube
Pole ground connection, the drain electrode of the 4th switching tube and the grid of first switch tube and the grid of second switch connect, the 4th switching tube
Grid is connect with discharge circuit 12.
In the present embodiment, discharge circuit 12 controls the 4th switching tube and disconnects in the first delay time, so that the
One switching tube and second switch are connected in the first delay time.
Wherein, when being not required to four switching tubes, discharge circuit 12 is connect with the grid of first switch tube and second switch
Effective output at place is high level.If discharge circuit 12 is effective defeated with the grid junction of first switch tube and second switch
It is out low level, then, in the first delay time, discharge circuit 12 with the 4th switch tube grid by connecting, control the 4th
Switching tube disconnects, and realizes control first switch tube and second switch conducting with this.
In the present embodiment, discharge circuit 12 includes: first voltage detection module and reset controller；Voltage detection module
It is connect with power supply and reset controller, the cut-in voltage of discharge circuit 12 whether is reached for detecting power input voltage；It resets
Controller is connect with the grid of the 4th switching tube, for controlling the disconnection or conducting of the 4th switching tube.
Wherein, reset controller includes resetting output pin, resets output pin and connect with the grid of the 4th switching tube；It is multiple
Level controller controls the disconnection or conducting of the 4th switching tube by resetting output pin.At this point, the reset of reset controller
Effective output of output pin is low level.It, should when effective output of the reset output pin of reset controller is high level
Resetting output pin can directly connect with the grid of first switch tube and two switching tubes.
In addition, first voltage detection module includes: the first divider resistance and the first delay capacitor；First divider resistance is used for
Detect power input voltage；First delay capacitor is for being arranged the first delay time.First divider resistance includes two resistance, with
This realizes partial pressure.Pass through the different resistance value of two resistance of setting, the cut-in voltage of settable different discharge circuit 12.When power supply is defeated
When entering voltage and reaching the cut-in voltage, discharge circuit 12 is started to work.It, can by the way that the different capacitances of the first delay capacitor are arranged
It realizes and the first different delay times is set.
As one embodiment of the utility model, soft starting circuit 13 further include: second voltage detection module, electric current inspection
Survey module and soft start controller；Second voltage detection module is connect with switching circuit 11, power supply and soft start controller, detection
Whether power input voltage reaches the cut-in voltage of soft starting circuit；It current detection module and third switching tube, power supply and soft opens
Movement controller connection, for detecting mains input current and the mains input current that will test is sent to soft start controller；
Soft start controller is connect with third switching tube, for controlling the disconnection or conducting of third switching tube according to mains input current.
Wherein, current detection module can detecte the size of current in current power supply line, i.e., electric power outputting current is big
It is small.The current value that soft starting circuit 13 is sent by current detection module, the degree of control third switching tube conducting, is realized with this
Soft start.
In the present embodiment, second voltage detection module includes: the second divider resistance and the second delay capacitor；Second partial pressure
Resistance is for detecting power input voltage；Second delay capacitor is for being arranged the second delay time.Second divider resistance includes two
A resistance realizes partial pressure with this.Pass through the different resistance value of two resistance of setting, the unlatching electricity of settable different soft starting circuit 13
Pressure.When power input voltage reaches the cut-in voltage, soft starting circuit 13 is started to work.Pass through the second delay capacitor of setting
Different capacitances are, it can be achieved that be arranged the second different delay times.
Wherein, the cut-in voltage of soft starting circuit 13 is higher than the cut-in voltage of discharge circuit 12.In order to guarantee to power on
Cheng Zhong, discharge circuit 12 can work prior to soft starting circuit 13, and the cut-in voltage of discharge circuit 12 will be lower than soft start
The cut-in voltage of circuit 13.
In the present embodiment, the grid of third switching tube is connect with soft start controller, the source electrode of third switching tube and outer
The connection of portion's equipment, the drain electrode of third switching tube are connect with current detection module.
Wherein, soft start controller includes: soft start output pin and switch pin, and soft start output pin is opened with third
Close the grid connection of pipe；Switch pin is connected by the drain electrode of second voltage detection module and first switch tube.In first switch
When pipe disconnects, the switch pin of soft start controller is raised, and soft start controller is started to work at this time.In soft start controller
After start-up operation, soft start controller controls the output of soft start output pin according to electric power outputting current, controls third with this
Switching tube is gradually turned on.After the conducting of third switching tube, power supply directly passes through third switching tube and powers to external equipment.
The main three parts of power safety activation system of the utility model: switching circuit, soft starting circuit and electric discharge electricity
Road.Wherein, it contains voltage detecting circuit (second voltage detection module), current detection circuit, switchs inside soft starting circuit
Control circuit (third switching tube), delay startup circuit (second voltage detection module) and main control logic (soft start control
Device processed).Wherein main control logic can be used as an integrated chip and complete, current detection circuit and ON-OFF control circuit with
Power supply line is linked into main control logic while connection.Wherein voltage detecting circuit is used to obtain input voltage value, with
Internal reference voltage compares, and controller cutting output can be closed when finding electric voltage exception.Current detection circuit passes through detection
The current conditions of main current supply circuit, in order to realize soft start according to the situation control switch of electric current.It wraps again discharge circuit part
Delay startup circuit and voltage detecting circuit (first voltage detection module) and control circuit (reset controller) are included.Control
Circuit processed mainly includes reset chip, arranges in pairs or groups external switching circuit to realize electric discharge and reset function.Pass through switch after starting
Board is grounded for electrical measurement in order to be substantially discharged by circuit.Delay disconnects discharge path after a certain period of time.If in addition input terminal
Detect that output reset signal is resetted system by Voltage Drop.In order to prevent in reseting procedure soft starting circuit output and electric discharge
Circuit constitutes short circuit, and the reset outlet side of discharge circuit will simultaneously close off soft starting circuit cutting power switch.
It is illustrated in figure 2 the power safety activation system circuit diagram of one specific embodiment of the utility model, D1 as shown in the figure
Filter circuit is constituted with C1；Soft starting circuit: hot-swapping controller is soft start controller, wherein Gate is that soft start is defeated
Pin out, ON are switch pin, and R1 constitutes current detection module, and Q3 is third switching tube, and R5, R7, C5 and C4 constitute the
Two voltage detection modules, wherein C5 is the second delay capacitor, and R5 and R7 are the second divider resistance；Discharge circuit: reset chip is
Reset controller, wherein RST is to reset output pin, and R11, R12, C9 and C10 constitute first voltage detection module, wherein C9
For the first delay capacitor, R11 and R12 are the first divider resistance；Switching circuit: R8, R9, R10, Q1 and Q2 constitute switch electricity
Road, wherein Q1 is first switch tube, and Q2 is second switch.
In the present embodiment, soft starting circuit uses a hot-swapping controller, and discharge circuit is using reset IC chip.Electricity
Source inputs Vcc by protection diode D1 to ground, and to system power supply after filter capacitor C1, power supply circuit is divided into two branches
A and B.The road A series resistance R1 and Q3 (NMOS) arrive power output end C.The left and right ends of R1 are coupled with hot-swapping controller
Vcc and Sense pin, for detecting supply current.The grid of Q3 connects the Gate pin of hot-swapping controller.Gate pin can be with
The on-off for controlling Q3 realizes supply current control.The switch pin (ON/OFF) of hot-swapping controller divides Vcc by R5 and R7
It obtains.Hot-swapping controller will have delay start function, and the time of delay is adjusted by external capacitor C5 over the ground.
Discharge circuit is accessed on the power supply road B, and discharge circuit resets IC by one and controls, and the road B is accessed after C8 is filtered resets IC
Vdd energization pins, the power supply of the road B is connected to the SENSE pin of reset chip, Sense pin warp by R11 and R12 series connection partial pressure
C10 is crossed to be filtered over the ground.Reset chip will have delayed startup function, and the time of delay passes through external capacitor C9 tune over the ground
Section.The reset output pin (RST) of reset chip is connected to the grid (D point) of Q1 and Q2, wherein one resistance R9 of D point series connection connects
To power supply Vcc, D point is connected to Q2 grid by series connection R10, and the source electrode of Q1 and Q2 are grounded respectively.The drain electrode of Q1 is connected to hot plug control
The drain electrode of the switch pin of device processed, Q2 is connected to power supply output end C point by the R8 that connects.
During the work time, it first has to adjust respective divider resistance according to the characteristic of hot-swapping controller and reset chip
R5,R7,R11,R12.Guarantee discharge circuit cut-in voltage Vt1 be less than soft starting circuit cut-in voltage Vt2, adjustment C5 and
C9 size makes two-part delay time in suitable range, it is assumed that is respectively T1 and T2.In power up, discharge circuit
Control chip work first, RST pin is high always within time T1, Q2 closure, C point is grounded by R8 at this time, at this time
If in external equipment with the presence of charge if will do it and discharge over the ground.Reducing R8 may be implemented quick discharge operation.T1's sets
It is abundant to set power down to be guaranteed.During T1, Q1 is also closed so that hot-swapping controller ON/OFF pin is lasting low, so hot plug
The Gate pin of controller keeps low, and Q3 is off-state.So being in the discharge condition before powering in T1 procedures system.T1 mistake
Afterwards, RST is dragged down, and D point is low level, and Q1 and Q2 are disconnected, and ON pin gets higher level, and hot-swapping controller is started to work at this time, etc.
After the T2 moment, hot-swapping controller starts to control Gate pin high level Q3 realization voltage output is connected, until system is steady
It is fixed.There is soft start control function, i.e. controller can move tune section by detecting the electric current of R1 inside hot-swapping controller
The voltage of Gate is to control electric current no more than scheduled current value.It thus can effectively inhibit the surge electricity of startup stage
Stream reduces the impact to system.
During power down, soft starting circuit can close power switch Q3 first it is detected that Voltage Drop immediately.It puts at this time
Circuit power supply due to the presence of capacitor can be of short duration work, and voltage drop as low as can export electric discharge immediately after Sense voltage
Movement, until supply voltage deficiency.
It is illustrated in figure 3 the power safety activation system circuit diagram of the utility model another specific embodiment, as shown in the figure
Reset output pin effective output for #RST, as low level is effective.At this point, further comprising the 4th switch in switching circuit
Pipe Q4.The reset output pin (#RST) of reset chip is connected to the grid of Q4, the source ground connection of Q4, and drain terminal (D point) connects Q1's
Grid, the D point resistance R9 that connects are connected to power supply Vcc, and D point is connected to Q2 grid by series connection R10, and the source electrode of Q2 and Q3 connect respectively
Ground.The control chip of power up at this time, discharge circuit works first, and #RST pin is low always within time T1, and Q4 is disconnected,
And Q2 closure, Q1 are also closed.After T1, #RST is drawn high, Q4 closure, and D point is low level, and Q1 and Q2 are disconnected, and ON pin gets higher electricity
It is flat.At this time hot-swapping controller start to work, wait the T2 moment after, hot-swapping controller start control Gate pin high level with
Q3 is connected and realizes voltage output, until system is stablized.
It is illustrated in figure 4 a kind of timing diagram of power safety activation system of the utility model embodiment, specifically, in Fig. 4
Show corresponding diagram 3 power safety activation system power on during power down, tie point, the reset chip of A branch and B branch
#RST pin and hot-swapping controller Gate pin timing diagram.Figure 4, it is seen that system is before powering on, A branch
Gate pin with the tie point of B branch, the #RST pin of reset chip and hot-swapping controller is low-voltage.It was powering on
Cheng Zhong, A branch and the voltage of the tie point of B branch are gradually increasing, and discharge circuit starts work after the t1 moment reaches cut-in voltage
Make, the #RST pin of reset chip becomes high level at the t3 moment, that is, powers on the electric discharge started between the t3 moment being system
Journey, external equipment discharge via the switching tube in switching circuit to ground, then, when t1~t3 is the first delay of discharge circuit
Between.Soft starting circuit reaches cut-in voltage at the t2 moment, due to the hot plug control of switching tube in switching circuit and soft starting circuit
The switch pin of device processed connects, and soft starting circuit can not get started work.Soft starting circuit is started to work at the t3 moment, and t3~
T4 is the second delay time of soft starting circuit.After the second delay time, soft starting circuit starts soft start-up process, and Gate draws
Voltage is gradually increasing foot in a short time, so that power switch pipe (third switching tube) is gradually connected.It is soft to open during power down
Dynamic circuit is at the t5 moment first it is detected that Voltage Drop, turns off the switch pipe so that power outage.Discharge circuit power supply due to
The presence of capacitor, work that can be of short duration between t5~t6, and after voltage drop is as low as the Sense pin voltage of hot-swapping controller
Discharging action can be exported immediately, until supply voltage deficiency.
By the voltage security activation system of the utility model, delayed startup, soft start, starting pre-arcing function are realized,
Fully ensure that the clean boot in different occasions.It joined the active discharge process of a period of time in the start-up course of power supply,
To guarantee to restart after external equipment is substantially discharged, avoid because starting timing entanglement problem caused by charge accumulated.Delay
Start-up time delay can be adjusted flexibly in startup function according to the actual situation, in order to which the power supply shakiness for the initial start stage that is staggered is pledged love
Condition.By soft start control can by limiting starting current, inhibit due to load capacitance it is excessive caused by surge effect and incite somebody to action
Supply voltage drags down.It is safer to be achieved in start-up course, coverage area is wider.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be understood that being not used to limit this foregoing is merely specific embodiment of the utility model
The protection scope of utility model, within the spirit and principle of the utility model, any modification for being made, changes equivalent replacement
Into etc., it should be included within the scope of protection of this utility model.
Claims (14)
1. a kind of power safety activation system, which is characterized in that the power safety activation system includes: switching circuit, electric discharge
Circuit and soft starting circuit；The switching circuit is connected between power supply and external equipment, the discharge circuit and the power supply
And the switching circuit connection, the soft starting circuit are connect with the power supply, the switching circuit and the external equipment；
The switching circuit includes first switch tube and second switch；The first switch tube and the power supply, the electric discharge
Circuit and soft starting circuit connection, the second switch and the power supply, the discharge circuit and the external equipment
Connection；
After the electric power starting, when power input voltage reaches the cut-in voltage of the discharge circuit, the discharge circuit
It controls the first switch tube and the second switch to be connected in default first delay time, so that the external equipment exists
In first delay time, discharged by the second switch；
After first delay time, the discharge circuit controls the first switch tube and second switch disconnects；
After default second delay time, the soft starting circuit controls its third switching tube and is gradually connected, so that the electricity
Source is done step-by-step to the external equipment and powers.
2. power safety activation system according to claim 1, which is characterized in that the system also includes filter circuit,
The filter circuit is connect with the power supply, the discharge circuit and the soft starting circuit.
3. power safety activation system according to claim 1, which is characterized in that the grid of the first switch tube and institute
Grid, the discharge circuit and the power supply connection of second switch are stated, the drain electrode of the first switch tube soft is opened with described
Dynamic circuit connection, the source electrode ground connection of the first switch tube.
4. power safety activation system according to claim 1, which is characterized in that the source electrode of the second switch connects
Ground, the drain electrode of the second switch are connect with the external equipment；When second switch conducting, the external equipment
It is discharged by the second switch to ground.
5. power safety activation system according to claim 1, which is characterized in that the switching circuit further includes the 4th opening
Guan Guan, the source electrode ground connection of the 4th switching tube, grid and institute of the drain electrode of the 4th switching tube with the first switch tube
The grid connection of second switch is stated, the grid of the 4th switching tube is connect with the discharge circuit.
6. power safety activation system according to claim 5, which is characterized in that the discharge circuit control the described 4th
Switching tube disconnects in first delay time, so that the first switch tube and second switch are in the described first delay
Interior conducting.
7. power safety activation system according to claim 6, which is characterized in that the discharge circuit includes: the first electricity
Press detection module and reset controller；
The voltage detection module is connect with the power supply and the reset controller, is for detecting the power input voltage
The no cut-in voltage for reaching the discharge circuit；
The reset controller is connect with the grid of the 4th switching tube, for controlling the disconnection of the 4th switching tube or leading
It is logical.
8. power safety activation system according to claim 7, which is characterized in that the reset controller includes that reset is defeated
Pin out, the reset output pin are connect with the grid of the 4th switching tube；The reset controller passes through the reset
Output pin controls the disconnection or conducting of the 4th switching tube.
9. power safety activation system according to claim 7, which is characterized in that the first voltage detection module packet
It includes: the first divider resistance and the first delay capacitor；
First divider resistance is for detecting the power input voltage；
First delay capacitor is for being arranged first delay time.
10. power safety activation system according to claim 1, which is characterized in that the soft starting circuit further include: the
Two voltage detection modules, current detection module and soft start controller；
The second voltage detection module is connect with the switching circuit, the power supply and the soft start controller, detects institute
State the cut-in voltage whether power input voltage reaches the soft starting circuit；
The current detection module is connect with the third switching tube, the power supply and the soft start controller, for detecting
The mains input current and mains input current that will test is sent to the soft start controller；
The soft start controller is connect with the third switching tube, for controlling the third according to the mains input current
The disconnection or conducting of switching tube.
11. power safety activation system according to claim 10, which is characterized in that the second voltage detection module packet
It includes: the second divider resistance and the second delay capacitor；
Second divider resistance is for detecting the power input voltage；
Second delay capacitor is for being arranged second delay time.
12. power safety activation system according to claim 10, which is characterized in that the unlatching electricity of the soft starting circuit
Pressure is higher than the cut-in voltage of the discharge circuit.
13. power safety activation system according to claim 10, which is characterized in that the grid of the third switching tube with
The soft start controller connection, the source electrode of the third switching tube are connect with the external equipment, the third switching tube
Drain electrode is connect with the current detection module.
14. power safety activation system according to claim 10, which is characterized in that the soft start controller includes:
Soft start output pin and switch pin, the soft start output pin are connect with the grid of the third switching tube；It is described to open
Pin is closed to connect by the second voltage detection module with the drain electrode of the first switch tube.
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| CN201821278810.3U CN208401734U (en) | 2018-08-09 | 2018-08-09 | A kind of power safety activation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067161A (en) * | 2018-08-09 | 2018-12-21 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067161A (en) * | 2018-08-09 | 2018-12-21 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
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