CN206249131U - Power protecting circuit and supply unit - Google Patents
Power protecting circuit and supply unit Download PDFInfo
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- CN206249131U CN206249131U CN201621373230.3U CN201621373230U CN206249131U CN 206249131 U CN206249131 U CN 206249131U CN 201621373230 U CN201621373230 U CN 201621373230U CN 206249131 U CN206249131 U CN 206249131U
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Abstract
The utility model discloses a kind of power protecting circuit and supply unit; the power protecting circuit includes that power supply output delay circuit, hot plug protection circuit, the input of power supply output delay circuit are connected with power input, and the output end of power supply output delay circuit is connected with power output end；Power supply output delay circuit, for when power output end has load to access signal, being exported to load after the supply voltage that power supply is exported is carried out into ascending regulation treatment；The test side of hot plug protection circuit is connected with power output end, and the output end of hot plug protection circuit is connected with the controlled end of power supply output delay circuit；For the output control signal when the hot plug signal of power output end feedback load is detected, after the supply voltage time delay Preset Time that control power supply output delay circuit exports power supply, then export to load.When the utility model solves dc source and load and is directly connected to, the problem that the instantaneous large-current for producing damages dc source is loaded.
Description
Technical field
The utility model is related to power technique fields, more particularly to a kind of power protecting circuit and supply unit.
Background technology
In application of the power supply to various load supplyings, because power supply and load are directly to connect, in load powered on moment
Or during load hot plug, load can produce instantaneous large-current due to the presence of filter capacitor, and pour in down a chimney to power supply, cause power supply
In the component such as semiconductor devices and fuse, filter capacitor such as diode, triode, metal-oxide-semiconductor bear overcurrent or
Overvoltage and damage.
Utility model content
Main purpose of the present utility model is to propose a kind of power protecting circuit and supply unit, it is intended to solve dc source
When being directly connected to load, the problem that the instantaneous large-current for producing damages dc source is loaded, improve the protection energy of power supply
Power.
To achieve the above object, the utility model proposes a kind of power protecting circuit, the power protecting circuit includes power supply
Output delay circuit, hot plug protection circuit, the power input for connecting power supply and the power supply for connecting load
Output end；The input of the power supply output delay circuit is connected with the power input, the power supply output delay circuit
Output end be connected with the power output end；The power supply output delay circuit, for having load in the power output end
When accessing signal, exported to the load after the supply voltage that the power supply is exported is carried out into ascending regulation treatment；
The test side of the hot plug protection circuit is connected through the power supply output delay circuit with the power output end,
The output end of the hot plug protection circuit is connected with the controlled end of the power supply output delay circuit；The hot plug protection electricity
Road, for when the hot plug signal of the power output end feedback load is detected, output control signal to control the power supply
After the supply voltage time delay Preset Time that output delay circuit exports the power supply, then export to the load.
Preferably, the power supply output delay circuit includes the first electronic switch and energy-storage delay circuit, and the energy storage is prolonged
When the input of circuit, the input of first electronic switch be connected with the power input respectively, the energy storage time delay
The output end of circuit is connected with the controlled end of first electronic switch；The output end of first electronic switch and the power supply
Output end is connected；The energy-storage delay circuit be used for the power supply power output end have load access when, output by
The small voltage signal to big gradual change, to control the conducting degree of first electronic switch.
Preferably, first electronic switch is P-MOS pipes, and the source electrode of the P-MOS pipes is first electronic switch
Input, the P-MOS pipes drain electrode for first electronic switch output end, the grid of the P-MOS pipes is described
The controlled end of the first electronic switch.
Preferably, the energy-storage delay circuit includes capacitor, first resistor and second resistance, the first of the capacitor
Hold and interconnected with the input of the power input, the first end of the first resistor and first electronic switch, the electricity
Second end of container and the of the second end of the first resistor, the controlled end of first electronic switch and the second resistance
Two ends interconnect；The second end ground connection of the second resistance.
Preferably, the hot plug protection circuit includes 3rd resistor, the 4th resistance, the 5th resistance and the second electronic cutting
Close, the first end of the 3rd resistor is the test side of the hot plug protection circuit, and with the first end of the 4th resistance
Connection, the second end of the 3rd resistor is connected with the controlled end of second electronic switch；Second end of the 4th resistance
It is connected with the input and the power input of second electronic switch；The output end of second electronic switch is through described
5th resistance is connected with the controlled end of the power supply output delay circuit.
Preferably, second electronic switch is PNP type triode, and the base stage of the PNP type triode is described second
The controlled end of electronic switch, the input of extremely described second electronic switch of transmitting of the PNP type triode, the positive-negative-positive
The output end of extremely described second electronic switch of the current collection of triode.
Preferably, the power supply protection circuit also includes voltage-regulator diode, the anode of the voltage-regulator diode and institute
State the output end connection of hot plug protection circuit, the inspection of the negative electrode of the voltage-regulator diode and the hot plug protection circuit
Survey end connection.
Preferably, the power supply protection circuit also includes Sampling Integral circuit and current foldback circuit, the sampling
The test side of integrating circuit is connected with the load, the feedback end of the Sampling Integral circuit and connecing for the current foldback circuit
Receiving end is connected；The controlled end of the current foldback circuit is connected with the controlled end of the power supply output delay circuit；The sampling
Integrating circuit is used to, when the electric current for detecting the load exceedes default current protection threshold value, detection signal is fed back into institute
Current foldback circuit is stated, is exported with controlling the power supply output delay circuit to stop supply voltage.
The utility model also proposes a kind of supply unit, and the supply unit includes above-mentioned power protecting circuit, and the power supply is protected
Protection circuit includes power supply output delay circuit, hot plug protection circuit, the power input for connecting power supply and is used for
Connect the power output end of load；The input of the power supply output delay circuit is connected with the power input, the electricity
The output end of source output delay circuit is connected with the power output end；The power supply output delay circuit, in the electricity
When source output terminal has load to access signal, the supply voltage that the power supply is exported is carried out defeated after ascending regulation treatment
Go out to the load；The test side of the hot plug protection circuit is through the power supply output delay circuit and the power output end
Connection, the output end of the hot plug protection circuit is connected with the controlled end of the power supply output delay circuit；The hot plug
Protection circuit, for when the hot plug signal of the power output end feedback load is detected, output control signal to control institute
After stating the supply voltage time delay Preset Time that power supply output delay circuit exports the power supply, then export to described negative
Carry.
The utility model power protecting circuit has load to access by setting power supply output delay circuit when power supply goes out end
When, output is protected to load while also setting up hot plug after the supply voltage that power supply is exported is carried out into ascending regulation treatment
Protection circuit, when the hot plug signal of power output end feedback load is detected, output control signal controls the power supply output
After the supply voltage time delay Preset Time that delay circuit exports power supply, then export to the load.Can so avoid
The surge current that load is produced in all cases impacts impaired, the utility model power supply guarantor to the component of dc source
Protection circuit improves the protective capacities of dc source.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram that the utility model power protecting circuit is applied in supply unit；
Fig. 2 is the electrical block diagram of power protecting circuit in Fig. 1.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Power supply output delay circuit | R1 | First resistor |
| 20 | Hot plug protection circuit | R2 | Second resistance |
| 30 | Sampling Integral circuit | R3 | 3rd resistor |
| 40 | Current foldback circuit | R4 | 4th resistance |
| 12 | First electronic switch | R5 | 5th resistance |
| 11 | Energy-storage delay circuit | C0 | Capacitor |
| 21 | Second electronic switch | D0 | Voltage-regulator diode |
| Q1 | P-MOS is managed | Q2 | PNP type triode |
The realization of the utility model purpose, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of the utility model protection.
If it is to be appreciated that related in the utility model embodiment directionality indicate (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality indicates to be only used for explaining relative between each part under a certain particular pose (as shown in drawings)
Position relationship, motion conditions etc., if the particular pose changes, directionality indicates also correspondingly to change therewith.
If in addition, relate to the description of " first ", " second " etc. in the utility model embodiment, should " first ", " the
Two " description etc. is only used for describing purpose, and it is not intended that indicating or implying its relative importance or implicit indicate meaning
The quantity of the technical characteristic for showing.Thus, " first " is defined, the feature of " second " can express or implicitly include at least one
Individual this feature.In addition, the technical scheme between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, when the combination appearance of technical scheme is conflicting or cannot realize it will be understood that this technical side
The combination of case does not exist, not within the protection domain of the utility model requirement yet.
The utility model proposes a kind of power protecting circuit.
Reference picture 1, in the embodiment of the utility model one, the power protecting circuit include power supply output delay circuit 10,
Hot plug protection circuit 20, the power input (sign) for connecting power supply and the power supply output for connecting load
End (sign).
Wherein, the input of the power supply output delay circuit 10 is connected with the power input, the power supply output
The output end of delay circuit 10 is connected with the power output end；The power supply output delay circuit 10 is used for defeated in the power supply
When going out end and thering is load to access signal, by the supply voltage that the power supply is exported export after ascending regulation treatment to
The load.
The test side of the hot plug protection circuit 20 is through the power supply output delay circuit 10 and the power output end
Connection, the output end of the hot plug protection circuit 20 is connected with the controlled end of the power supply output delay circuit 10；The heat
Plug protection circuit 20 is used for the output control signal when the hot plug signal of the power output end feedback load is detected, with
After controlling the supply voltage time delay Preset Time that the power supply output delay circuit 10 exports the power supply, then export to
The load.
In the present embodiment, in power supply powering load, the moment that power supply is connected with load is due in load
Filter capacitor will produce very big charging current, namely surge current, if power supply is directly connected to load, the surge is electric
Stream pours in down a chimney into power supply, and the component in power supply will be caused to be subject to the impact of high current and damage.Or it is supported on band
Under the working condition of electricity, carry out hot plug and produce peak current, the component also led in power supply is subject to high current
Impact and damage.In order to avoid component is damaged, the voltage that the present embodiment is exported by power protecting circuit to power supply
Postponed, to reduce the generation of load peaks electric current namely surge current.
Specifically, when the power output end of power protecting circuit has load to access signal, now power supply output deferred telegram
Access the time increase of power supply with load and reduce until being equivalent to a variable resistor, and the resistance of variable resistor in road 10
Zero so that the electric current of power supply output is increased up to the max-thresholds electric current equal to power supply by small, so as to avoid load
On filter capacitor due to producing very big charging current in the moment accessed with power supply, dropped in the resistance of variable resistor
When being zero, power supply provides operating voltage for load, it is to avoid the normal work of influence load.
When hot plug protection circuit 20 detects the hot plug signal of the power output end feedback load, output control
Signal, after controlling the supply voltage time delay Preset Time that the power supply output delay circuit 10 exports the power supply,
That is after the resistance of control variable resistor is adjusted to max-thresholds, then reduce with the increase of time until being zero so that power supply electricity
The electric current of source output is increased up to the max-thresholds electric current equal to power supply by small, so as to avoid the filter capacitor in load from producing
The very big charging current of life, when the resistance of variable resistor is reduced to zero, power supply provides operating voltage for load again, loads
Recover normal work.
The utility model power protecting circuit has load to access by setting power supply output delay circuit 10 when power supply goes out end
When, exported to load, while also setting up hot plug after the supply voltage that power supply is exported is carried out into ascending regulation treatment
Protection circuit 20, when the hot plug signal of power output end feedback load is detected, output control signal controls the power supply
After the supply voltage time delay Preset Time that output delay circuit 10 exports power supply, then export to the load.So i.e.
Can avoid loading the surge current for producing in all cases and impaired, the utility model is impacted to the component of dc source
Power protecting circuit improves the protective capacities of dc source.
It is understood that because the circuit structure of the utility model power protecting circuit is simply easily achieved, this practicality
It is new can also avoid being supported on electric motor starting or the internal start and stop suddenly of load etc. it is various in the case of, produce surge current to supplying
Power supply is impacted.
Reference picture 2, in a preferred embodiment, the power supply output delay circuit 10 includes energy-storage delay circuit 11 and the
One electronic switch 12, the input of the energy-storage delay circuit 11, first electronic switch 12 input respectively with it is described
Power input is connected, and the output end of the energy-storage delay circuit 11 is connected with the controlled end of first electronic switch 12；Institute
The output end for stating the first electronic switch 12 is connected with the power output end；The energy-storage delay circuit 11 is used in the power supply
When the power output end of power supply has load to access, the voltage signal of ascending gradual change is exported, to control first electronic cutting
Close 12 conducting degree.
In the present embodiment, energy-storage delay circuit 11 is used to control the working condition of the first electronic switch 12, the first electronic cutting
Closing 12 is used to realize the electrical connection of power supply and load.
Further, first electronic switch 12 is preferably P-MOS pipes Q1, and the source electrode of the P-MOS pipes Q1 is described
The input of the first electronic switch 12, the drain electrode of the P-MOS pipes Q1 is the output end of first electronic switch 12, the P-
The grid of metal-oxide-semiconductor Q1 is the controlled end of first electronic switch 12.
In other embodiments, the first electronic switch 12 can also realize that this is not restricted using other switches.
Further, the energy-storage delay circuit 11 preferably uses capacitor C0, first resistor R1 and second resistance R2, institute
State the first end of capacitor C0 and the source of the power input, the first end of the first resistor R1 and the P-MOS pipes Q1
Pole interconnects, second end of second end of the capacitor C0 and the first resistor R1, the grid of the P-MOS pipes Q1 and described
The first end interconnection of second resistance R2；The second end ground connection of the second resistance R2.
In the present embodiment, the time constant of energy-storage delay circuit 11 is determined by the capacitance and resistance R1, R2 of capacitor C0.
Specifically, the characteristic that can not be mutated according to voltage on capacitor C0, when load accesses power supply, the voltage on capacitor C0
It is zero, equivalent to short circuit, the voltage at capacitor C0 two ends is equal to the voltage of power supply to capacitor C0, now P-MOS pipes Q1
The voltage of grid is maximum, and the grid voltage between source electrodes of P-MOS pipes Q1 are zero, P-MOS pipes Q1 cut-offs；With the charging of capacitor C0
The grid source electrode of voltage rising, the voltage decline at capacitor C0 two ends, the voltage reduction of the grid of P-MOS pipes Q1, and P-MOS pipes Q1
Between voltage gradually by the occasion of negative value is changed into, P-MOS pipes Q1 is gradually turned on, and now exports to load current with P-MOS pipes Q1's
The increase linear rise of conducting degree, when capacitor C0 is full of, because capacitor C0 is to galvanic buffer action so that electricity
The voltage at container C0 two ends is reduced to zero, and now the voltage of the grid of P-MOS pipes Q1 is minimum, and P-MOS pipes Q1 enters saturation state, defeated
Go out to the electric current of load to be equal to the electric current of power supply output.
Reference picture 2, in a preferred embodiment, the hot plug protection circuit 20 includes 3rd resistor R3, the 4th resistance
R4, the 5th resistance R5 and the second electronic switch 21, the first end of the 3rd resistor R3 is the hot plug protection circuit 20
Test side, and be connected with the first end of the 4th resistance R4, the second end and second electronic cutting of the 4th resistance R4
Close 21 controlled end connection；The input and the power supply of second end of the 3rd resistor R3 and second electronic switch 21
Input is connected；The output end of second electronic switch 21 is through the 5th resistance R5 and the power supply output delay circuit 10
Controlled end connection.
Further, in the present embodiment, second electronic switch 21 is preferably PNP type triode Q2, the positive-negative-positive three
The base stage of pole pipe Q2 is the controlled end of second electronic switch 21, the transmitting extremely described second of the PNP type triode Q2
The input of electronic switch 21, the output end of extremely described second electronic switch 21 of current collection of the PNP type triode Q2.
Specifically, when power supply is to load normal power supply, now because the bias voltage of PNP type triode Q2 is
Zero, PNP type triode Q2 is not turned on, when load carries out hot plug, the surge current of generation cause 3rd resistor R3 with
4th resistance R4 produces bias voltage and causes PNP type triode Q2 conductings, now PNP type triode Q2, resistance R1, R2, R3
With capacitor C0 composition discharge loops power supply is recharged by first resistor R1 to capacitor C0 and cause P-MOS
Pipe Q1 exits saturation state and reenters magnifying state, and so the electric current of output extremely load is again with the conducting journey of P-MOS pipes Q1
The increase of degree and linear rise, until P-MOS pipes Q1 enters saturation state, output to the electric current of load is again equal to power supply
The electric current of output.
It is understood that the resistance of first resistor R1 is sufficiently large, the surge current for producing is loaded due to the first electricity
The inhibition of R1 is hindered, will be consumed by first resistor R1 and be unlikely to flow into power supply.
Reference picture 2, based on above-described embodiment, the power supply protection circuit still further comprises voltage-regulator diode D0,
The anode of the voltage-regulator diode D0 is connected with the output end of the hot plug protection circuit 20, the moon of the voltage-regulator diode D0
Pole is connected with the test side of the hot plug protection circuit 20.
In the present embodiment, when voltage-regulator diode D0 is used to avoid the electric voltage exception of power supply, metal-oxide-semiconductor is protected, it is to avoid MOS
Pipe is impaired.
Reference picture 1, in a preferred embodiment, the power supply protection circuit still further comprises Sampling Integral circuit
30 and current foldback circuit 40, the test side of the Sampling Integral circuit 30 is connected with the load, the Sampling Integral circuit
30 feedback end is connected with the receiving terminal of the current foldback circuit 40；The controlled end of the current foldback circuit 40 and the electricity
The controlled end connection of source output delay circuit 10；The Sampling Integral circuit 30 is used to exceed in the electric current for detecting the load
During default current protection threshold value, detection signal is fed back into the current foldback circuit 40, to control the power supply output to prolong
Slow circuit 10 stops supply voltage output.
In the present embodiment, when Sampling Integral circuit is excessive in the electric current for detecting load, and the overcurrent continues to default
During the time, detection signal is fed back to the current foldback circuit 40, the output phase of current foldback circuit 40 by Sampling Integral circuit 30
The control signal answered disconnects power supply and the electrical connection for loading to control power supply output delay circuit 10 to work, from
And power supply output of the power supply to loading of stopping power supply.
In order to thought of the present utility model is better described, below in conjunction with Fig. 1 and Fig. 2 to physical circuit of the present utility model
Principle is illustrated：
When there is load to access on power supply, according to the characteristic that voltage on capacitor C0 can not be mutated, when load is accessed
During power supply, the voltage on capacitor C0 is zero, and the voltage at capacitor C0 two ends is equal to the voltage of power supply, is now
The voltage of the grid of P-MOS pipes Q1 is maximum, and the grid voltage between source electrodes of P-MOS pipes Q1 are zero, P-MOS pipes Q1 cut-offs；With electricity
The charging voltage of container C0 rises, and the voltage at capacitor C0 two ends declines, and the voltage of the grid of P-MOS pipes Q1 reduces, and P-MOS
The grid voltage between source electrodes of pipe Q1 gradually become negative, and P-MOS pipes Q1 is gradually turned on, and now export to load current with P-MOS pipes Q1's
The increase of conducting degree and linear rise, when capacitor C0 is full of, because capacitor C0 is to galvanic buffer action so that
The voltage at capacitor C0 two ends is reduced to zero, and now the voltage of the grid of P-MOS pipes Q1 is minimum, and P-MOS pipes Q1 enters saturation state,
Output is equal to the electric current of power supply output to the electric current of load.
When load carries out hot plug, the surge current of generation causes that 3rd resistor R3 and the 4th resistance R4 produces biased electrical
Press and cause PNP type triode Q2 conductings, now PNP type triode Q2, resistance R1, R2, R3 and capacitor C0 compositions discharge back
Road causes that capacitor C0 starts electric discharge, capacitor C0 is recharged by power supply again after discharging completely and causes metal-oxide-semiconductor
Exit saturation state and reenter magnifying state, so output to load current again with P-MOS pipes Q1 conducting degree increasing
Linear rise, until P-MOS pipes Q1 enters saturation state, exports to the electric current of load and recovers normal power supply again greatly
The current value of output.
The utility model power protecting circuit is avoided and loads the surge current for producing in all cases to power supply
Component impact and impaired problem, improve the protective capacities of power supply.
The utility model also proposes a kind of supply unit, and the supply unit includes power protecting circuit as described above.Should
The detailed construction of power protecting circuit can refer to above-described embodiment, and here is omitted；It is understood that due in this practicality
Above-mentioned power protecting circuit has been used in novel electric appliance equipment, therefore, the embodiment of the utility model supply unit is including above-mentioned
Whole technical schemes of power protecting circuit whole embodiments, and the technique effect for being reached is also identical, no longer goes to live in the household of one's in-laws on getting married herein
State.
Preferred embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited,
It is every under inventive concept of the present utility model, the equivalent structure made using the utility model specification and accompanying drawing content is become
Change, or directly/be used in other related technical fields indirectly and be included in scope of patent protection of the present utility model.
Claims (9)
1. a kind of power protecting circuit, it is characterised in that the power protecting circuit includes that power supply output delay circuit, hot plug are protected
Protection circuit, the power input for connecting power supply and the power output end for connecting load；The power supply output is prolonged
The input of slow circuit is connected with the power input, and output end and the power supply of the power supply output delay circuit are exported
End connection；The power supply output delay circuit, for when the power output end has load to access signal, by the power supply electricity
The supply voltage of source output is exported to the load after carrying out ascending regulation treatment；
The test side of the hot plug protection circuit is connected through the power supply output delay circuit with the power output end, described
The output end of hot plug protection circuit is connected with the controlled end of the power supply output delay circuit；The hot plug protection circuit,
For when the hot plug signal of the power output end feedback load is detected, output control signal to control the power supply defeated
After going out the supply voltage time delay Preset Time that delay circuit exports the power supply, then export to the load.
2. power protecting circuit as claimed in claim 1, it is characterised in that the power supply output delay circuit includes the first electricity
Sub switch and energy-storage delay circuit, the input of the energy-storage delay circuit, first electronic switch input respectively with
The power input connection, the output end of the energy-storage delay circuit is connected with the controlled end of first electronic switch；Institute
The output end for stating the first electronic switch is connected with the power output end；The energy-storage delay circuit is used in the power supply
Power output end when thering is load to access, the voltage signal of ascending gradual change is exported, to control first electronic switch
Conducting degree.
3. power protecting circuit as claimed in claim 2, it is characterised in that first electronic switch is P-MOS pipes, described
The source electrode of P-MOS pipes is the input of first electronic switch, and the drain electrode of the P-MOS pipes is first electronic switch
Output end, the grid of the P-MOS pipes is the controlled end of first electronic switch.
4. power protecting circuit as claimed in claim 2, it is characterised in that the energy-storage delay circuit includes capacitor, the
One resistance and second resistance, the first end of the capacitor and the power input, the first end of the first resistor and institute
State the input interconnection of the first electronic switch, the second end of the capacitor and the second end of the first resistor, described first
The first end interconnection of the controlled end of electronic switch and the second resistance；The second end ground connection of the second resistance.
5. power protecting circuit as claimed in claim 1, it is characterised in that the hot plug protection circuit includes the 3rd electricity
Resistance, the 4th resistance, the 5th resistance and the second electronic switch, the first end of the 3rd resistor is the hot plug protection circuit
Test side, and be connected with the first end of the 4th resistance, the second end and second electronic switch of the 4th resistance
Controlled end is connected；Second end of the 3rd resistor connects with the input of second electronic switch and the power input
Connect；The output end of second electronic switch is connected through the 5th resistance with the controlled end of the power supply output delay circuit.
6. power protecting circuit as claimed in claim 5, it is characterised in that second electronic switch is PNP type triode,
The base stage of the PNP type triode is the controlled end of second electronic switch, and the transmitting of the PNP type triode is extremely described
The input of the second electronic switch, the output end of extremely described second electronic switch of current collection of the PNP type triode.
7. power protecting circuit as claimed in claim 1, it is characterised in that the power supply protection circuit also includes voltage stabilizing
Diode, the anode of the voltage-regulator diode is connected with the output end of the hot plug protection circuit, the voltage-regulator diode
Negative electrode is connected with the test side of the hot plug protection circuit.
8. the power protecting circuit as described in claim 1 to 7 any one, it is characterised in that the power protecting circuit is also
Including Sampling Integral circuit and current foldback circuit, the test side of the Sampling Integral circuit is connected with the load, described to take
The feedback end of sample integrating circuit is connected with the receiving terminal of the current foldback circuit；The controlled end of the current foldback circuit and institute
State the controlled end connection of power supply output delay circuit；The Sampling Integral circuit is used to exceed in the electric current for detecting the load
During default current protection threshold value, detection signal is fed back into the current foldback circuit, to control the power supply output to postpone
Circuit stops supply voltage output.
9. a kind of supply unit, it is characterised in that the supply unit includes the power supply as described in claim 1 to 8 any one
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621373230.3U CN206249131U (en) | 2016-12-13 | 2016-12-13 | Power protecting circuit and supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621373230.3U CN206249131U (en) | 2016-12-13 | 2016-12-13 | Power protecting circuit and supply unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206249131U true CN206249131U (en) | 2017-06-13 |
Family
ID=59008742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621373230.3U Expired - Fee Related CN206249131U (en) | 2016-12-13 | 2016-12-13 | Power protecting circuit and supply unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206249131U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109756116A (en) * | 2019-01-30 | 2019-05-14 | 上海艾为电子技术股份有限公司 | Boost chip and its short-circuit protection circuit |
| CN110109792A (en) * | 2019-05-24 | 2019-08-09 | 珠海多士科技有限公司 | USB device plug-pull detecting circuit under a kind of operating system off-line state |
| CN111711164A (en) * | 2020-05-28 | 2020-09-25 | 苏州浪潮智能科技有限公司 | Circuit for delaying over-current protection and design method |
-
2016
- 2016-12-13 CN CN201621373230.3U patent/CN206249131U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109756116A (en) * | 2019-01-30 | 2019-05-14 | 上海艾为电子技术股份有限公司 | Boost chip and its short-circuit protection circuit |
| CN109756116B (en) * | 2019-01-30 | 2024-03-01 | 上海艾为电子技术股份有限公司 | Boost chip and short-circuit protection circuit thereof |
| CN110109792A (en) * | 2019-05-24 | 2019-08-09 | 珠海多士科技有限公司 | USB device plug-pull detecting circuit under a kind of operating system off-line state |
| CN111711164A (en) * | 2020-05-28 | 2020-09-25 | 苏州浪潮智能科技有限公司 | Circuit for delaying over-current protection and design method |
| CN111711164B (en) * | 2020-05-28 | 2022-06-14 | 苏州浪潮智能科技有限公司 | Circuit for delaying over-current protection and design method |
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Granted publication date: 20170613 Termination date: 20211213 |