CN108054909A - A kind of compact power supply protecting circuit designed method - Google Patents
A kind of compact power supply protecting circuit designed method Download PDFInfo
- Publication number
- CN108054909A CN108054909A CN201711399304.XA CN201711399304A CN108054909A CN 108054909 A CN108054909 A CN 108054909A CN 201711399304 A CN201711399304 A CN 201711399304A CN 108054909 A CN108054909 A CN 108054909A
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- CN
- China
- Prior art keywords
- nmos tube
- surging
- module
- power supply
- resistance
- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The present invention relates to power technique fields, more particularly to a kind of power protecting circuit and power supply.Power protecting circuit provided by the invention includes filter capacitor, Anti-surging prevents reversed module and delay switch module.Filter capacitor, delay switch module and voltage conversion circuit connect the cathode of direct power supply, Anti-surging prevents that reversed module connects the cathode of direct power supply, Anti-surging prevents that reversed module is also connected with filter capacitor and delay switch module, wherein, Anti-surging prevents that reversed module includes thermistor and NMOS tube, the module is under the action of delay switch module, the high current inputted when circuit powers on is reduced by thermistor, also utilize the body diode limitation current direction in NMOS tube, realize the inhibition to surge current and reverse current, since used thermistor is low with NMOS tube price, it is small, the circuit is applied in power supply, the price and volume of power supply can be substantially reduced, and prevent reversed circuit without in addition setting.
Description
Technical field
The present invention relates to power technique fields, more particularly to a kind of compact power supply protecting circuit designed method.
Background technology
In PSU, power protecting circuit can be generally set, can realize the inhibition to surge current and reverse current, with
Ensure the safe handling of power supply.
In the moment that the Switching Power Supply of high current input powers on, if Switching Power Supply does not have Anti-surging function, height is just had
It is inputted up to hundreds of amperes of electric currents.So big electric current not only has a great impact to the service life of the filter capacitor of on-chip power,
And will also result in very big injury to power grid, circuit can be even burnt out when serious.Therefore, people can generally add in power supply
Relay is to prevent surge current.
In addition, in the circuit of access DC current, do not allow usually power positive cathode reversed.If accidentally just
Cathode is reversed, and the reverse current of appearance may result in the filter capacitor damage of polarized, blowout.Therefore, for safety,
Generally also need to add in anti-reversed circuit in a power.
However, the relay that can be resistant to high current for a long time is sufficiently bulky and expensive.And common Switching Power Supply
Circuit does not possess anti-reversed function generally, it is necessary to be independently arranged relevant circuit.
In conclusion there are volume is big, price is high and needs to be independently arranged anti-reversed electricity for existing power protecting circuit
The problem of road, is, it is necessary to design the needs of new circuit is to meet function and cost.
The content of the invention
The present invention provides a kind of power protecting circuit, it is intended to which solving existing power protecting circuit, there are volume is big, price
It is high and the problem of need to be independently arranged anti-reversed circuit.
The present invention is achieved through the following technical solutions, a kind of power protecting circuit, connects DC power supply and voltage becomes
Circuit is changed, including filter capacitor, the anode of the DC power supply and the input terminal of the voltage conversion circuit are connected to the filter altogether
The first end of ripple capacitance, the first end of the filter capacitor and the ground terminal of the voltage conversion circuit are connected to ground altogether；
The power protecting circuit further includes Anti-surging and prevents reversed module and delay switch module；
The Anti-surging prevents that the output terminal of reversed module connects the cathode of the DC power supply, and the Anti-surging prevents reversed mould
The input terminal of block connects the second end of the filter capacitor；
The input terminal of the delay switch module connects the first end of the filter capacitor, the delay switch module it is normal
Beginning connects the power end that the Anti-surging prevents reversed module, and the normal-closed end of the delay switch module, which connects the Anti-surging, to be prevented
The aerial drainage end of reversed module；
The Anti-surging prevents that reversed module includes：First resistor, second resistance, thermistor, the first capacitance, the first NMOS
Pipe and the second NMOS tube；
The drain electrode of first NMOS tube is the output terminal that the Anti-surging prevents reversed module, the grid of first NMOS tube
Pole connects the first end of the first resistor, the source electrode of first NMOS tube, the source electrode of second NMOS tube, the temperature-sensitive
The first end of resistance and the first end of first capacitance connect to form the aerial drainage end that the Anti-surging prevents reversed module altogether, described
The grid of second NMOS tube connects the first end of the second resistance, the second end of the first resistor, second capacitance
The second end of second end and the second resistance connects to form the power end that the Anti-surging prevents reversed module altogether, the temperature-sensitive electricity
The second end of resistance and the drain electrode of second NMOS tube connect to form the input terminal that the Anti-surging prevents reversed module altogether.
Another object of the present invention, which also resides in, provides a kind of power supply, including power converting circuit, further includes above-mentioned power supply
Protect circuit.
Power protecting circuit provided by the present invention includes filter capacitor, Anti-surging prevents reversed module and delay switch mould
Block.The cathode of filter capacitor, delay switch module and voltage conversion circuit connection DC power supply, Anti-surging prevent that reversed module connects
The cathode of DC power supply is connect, Anti-surging prevents that reversed module is also connected with filter capacitor and delay switch module.Wherein, Anti-surging is prevented connecing
Reverse block includes thermistor and NMOS tube, which reduces circuit under the action of delay switch module, by thermistor
The high current inputted when powering on, and thermistor short circuit is realized and surge current is inhibited after delay；Separately
Outside, which realizes the inhibition to reverse current also using the body diode limitation current direction in NMOS tube.By being used
Thermistor it is low with NMOS tube price, small, by the circuit be applied to power supply in, can substantially reduce power supply price and
Volume, and prevent reversed circuit without in addition setting.
Description of the drawings
The function structure chart for the power protecting circuit that Fig. 1 one embodiment of the invention provides
The exemplary circuit structure chart for the power protecting circuit that Fig. 2 one embodiment of the invention provides
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings.Following embodiment is only used for clearer
Ground illustrates technical scheme, and is not intended to limit the protection scope of the present invention and limits the scope of the invention.
Fig. 1 shows the modular structure for the power protecting circuit that the embodiment of the present invention is provided, and for convenience of description, only shows
Part related to the present invention is gone out, details are as follows：
The power protecting circuit that embodiment is provided can connect DC power supply 200 and voltage conversion circuit 300.Direct current
Source 200 can be the arbitrary power supply that can export direct current, such as accumulator, direct current generator or rectification circuit.Voltage conversion circuit 300
It can be Switching Power Supply, boosting inverter can be carried out to direct current or decompression transformation is handled.
The power protecting circuit can include filter capacitor 100, and reversed module 400 and delay can also be prevented including Anti-surging
Switch module 500；The anode of DC power supply 200 is connected to the first of filter capacitor 100 altogether with the input terminal of voltage conversion circuit 300
End, the first end of filter capacitor 100 are connected to ground altogether with the ground terminal of voltage conversion circuit 300.Anti-surging prevents reversed module 400
Output terminal connection DC power supply 200 cathode, Anti-surging, prevent reversed module 400 input terminal connection filter capacitor 100 the
Two ends.
Delay switch module 500 input terminal connection filter capacitor 100 first end, delay switch module 500 it is normally opened
End connection Anti-surging, the power end for preventing reversed module 400, the normal-closed end of delay switch module 500 are connection Anti-surging, anti-reversed
The aerial drainage end of module 400.
In the present embodiment, delay switch module 500 can utilize the electric current that input terminal is accessed to be filled for internal capacitance
Electricity, and using the switching tube inside the voltage triggered of capacitance, so as to fulfill the function of delay switch.And its normally open end only exists
Just there is electric current output when internal switch pipe is triggered, normal-closed end then just has electric current output before internal switching tube is not triggered.
Anti-surging prevents that reversed module 400 includes thermistor and NMOS tube, and the module is in the work of delay switch module 500
Under, the high current inputted when circuit powers on is reduced by thermistor, and by thermistor short circuit after delay, it is real
Now surge current is inhibited.In addition, the module can also utilize the body diode limitation current direction in NMOS tube, realize
Inhibition to reverse current.
Filter capacitor 100 can be single electrolytic capacitor or by the combination connected in series or in parallel of multiple electrolytic capacitors.Such as
Shown in Fig. 2, filter capacitor 100 can be capacitance C3, and the anode of the 3rd capacitance C3 is the first end of filter capacitor 100, and the 3rd is electric
The cathode for holding C3 is the second end of filter capacitor 100.
As an embodiment of the present invention, as shown in Fig. 2, for Anti-surging, preventing reversed module.
With reference to Fig. 2 to the embodiment of the present invention, the operation principle of the power protecting circuit provided is described further：
In the case where circuit correctly connects, i.e. the anode of the anode connection DC power supply 200 of the 3rd capacitance C3, first
The cathode of the drain electrode connection DC power supply 200 of NMOS tube Q1, the electric current that the anode of DC power supply 200 is exported at this time pass through the 3rd
Body diode inside capacitance C3, thermistor NTC1 and the first NMOS tube Q1 flows back to the cathode of DC power supply 200, so as to shape
Into circuit.Since electric current is very big at the beginning, thermistor NTC1 temperature under the action of electric current raises rapidly, thermistor NTC1
Resistance value also increase rapidly, high current is limited to low current, realizes the inhibition to surge current.
3rd NMOS tube Q3 is turned on due to grid receives high voltage, and electric current is flowed out by the anode of DC power supply 200, is passed through
3rd resistor R3, the 4th resistance R4, the 3rd NMOS tube Q3 and the first NMOS tube Q1 flow into the cathode of DC power supply 200, are formed
Second circuit.
Second capacitance C2 is also at charged state.When the voltage value of the second capacitance C2 reaches the breakdown voltage of voltage-stabiliser tube D1
When, voltage-stabiliser tube D1 conductings, and then NPN triode Q4 is turned on due to base stage receives high voltage.The conducting of NPN triode Q4 drags down
The grid voltage of 3rd NMOS tube Q3, the 3rd NMOS tube Q3 cut-offs.
Due to the cut-off of the 3rd NMOS tube Q3, the change in second circuit is by the outflow of the anode of DC power supply 200, by the
Three resistance R3, the 4th resistance R4, the first capacitance C1 and the first NMOS tube Q1 flow into the cathode of DC power supply 200.
First capacitance C1 is started to charge up, when the voltage on the first capacitance C1 reaches the first NMOS tube Q1 and the second NMOS tube Q2
Trigger voltage when, the first NMOS tube Q1 is turned on the second NMOS tube Q2, so as to by thermistor NTC1 short circuit.Electric current is by direct current
The anode output of power supply 200, DC power supply 200 is flowed by the 3rd capacitance C3, the second NMOS tube Q2 and the first NMOS tube Q1
Cathode forming circuit.Also, since the first NMOS tube Q1 is in the conduction state, parasitic body diode also corresponds to short
Road, the pressure drop between the drain electrode of the first NMOS tube Q1 and source electrode also become tens millivolts, and power consumption is extremely low.
User can be by adjusting the capacitance of the first capacitance C1, the capacitance of the second capacitance C2 and the 4th resistance R4
Resistance value is adjusted the delay time of delay switch module 500.Direct current can be equal in the voltage on the 3rd capacitance C3
Just the first NMOS tube Q1 is turned on the second NMOS tube Q2 during the voltage of 200 positive and negative interpolar of source, so that the security of circuit is more
Height further extends the service life of the 3rd capacitance C3.
In the case where circuit is reversed, i.e. the cathode of the anode connection DC power supply 200 of the 3rd capacitance C3, NMOS tube Q's
The anode of drain electrode connection DC power supply 200, at this time due to the effect of first NMOS tube Q1 body diode itself, electric current is blocked,
Realize the inhibition to reverse current.Since no electric current flows into the 3rd capacitance C3, the safety of circuit ensure that.
Another object of the present invention, which also resides in, provides a kind of power supply, including power converting circuit, further includes power protection electricity
Road.
In the present invention, since above-mentioned power protecting circuit uses Anti-surging, the anti-reversed cooperation of module 400 delay to open
Close module 500 and realize inhibition to surge current and reverse current, and its used thermistor it is low with NMOS tube price,
It is small, which is applied in power supply, the price and volume of power supply can be substantially reduced, and without in addition setting anti-connect
Circnit NOT.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of power protecting circuit connects DC power supply and voltage conversion circuit, including filter capacitor, the DC power supply
The input terminal of anode and the voltage conversion circuit is connected to the first end of the filter capacitor, the first end of the filter capacitor altogether
It is connected to ground altogether with the ground terminal of the voltage conversion circuit；It is characterized in that：The power protecting circuit, which further includes Anti-surging, to be prevented
Reversed module and delay switch module；The Anti-surging prevents that the output terminal of reversed module connects the cathode of the DC power supply, institute
It states Anti-surging and prevents that the input terminal of reversed module connects the second end of the filter capacitor；The input terminal of the delay switch module connects
The first end of the filter capacitor is connect, the normally open end of the delay switch module connects the power supply that the Anti-surging prevents reversed module
End, the normal-closed end of the delay switch module connect the aerial drainage end that the Anti-surging prevents reversed module；The Anti-surging is prevented reversed
Module includes：First resistor, second resistance, thermistor, the first capacitance, the first NMOS tube and the second NMOS tube；Described
The drain electrode of one NMOS tube is the output terminal that the Anti-surging prevents reversed module, the grid connection described first of first NMOS tube
The first end of resistance, the source electrode of first NMOS tube, the source electrode of second NMOS tube, the thermistor first end with
And the first end of first capacitance connects to form the aerial drainage end that the Anti-surging prevents reversed module altogether, the grid of second NMOS tube
Pole connects the first end of the second resistance, the second end of the first resistor, the second end of second capacitance and described
The second end of second resistance connects to form the power end that the Anti-surging prevents reversed module altogether, the second end of the thermistor and institute
The drain electrode for stating the second NMOS tube connects to form the input terminal that the Anti-surging prevents reversed module altogether.
2. power protecting circuit as described in claim 1, which is characterized in that the filter capacitor is the 3rd capacitance；Described
The anode of three capacitances is the first end of the filter capacitor, and the cathode of the 3rd capacitance is the second end of the filter capacitor.
3. power protecting circuit as described in claim 1, which is characterized in that the delay switch module can include：3rd
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd NMOS tube, NPN triode, voltage-stabiliser tube and the second capacitance；It is described
The first end of 3rd resistor is the input terminal of the delay switch module, the second end of the 3rd resistor, the 4th resistance
First end, the first end of the 5th resistance and the cathode of the voltage-stabiliser tube be connected to the first end of second capacitance altogether,
The second end of 4th resistance connects the normally open end to form the delay switch module altogether with the drain electrode of the 3rd NMOS tube, institute
The grid of the second end and the 3rd NMOS tube of stating the 5th resistance is connected to the collector of the NPN triode, the NPN tri- altogether
The anode of the base stage of pole pipe and the voltage-stabiliser tube is connected to the first end of the 6th resistance altogether, the source electrode of the 3rd NMOS tube,
The second end of the emitter of the NPN triode, the second end of the 6th resistance and second capacitance connects to form institute altogether
State the normal-closed end of delay switch module.
4. a kind of power supply, including power converting circuit, which is characterized in that the power supply is further included such as any one of claims 1 to 3
The power protecting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399304.XA CN108054909A (en) | 2017-12-21 | 2017-12-21 | A kind of compact power supply protecting circuit designed method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399304.XA CN108054909A (en) | 2017-12-21 | 2017-12-21 | A kind of compact power supply protecting circuit designed method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108054909A true CN108054909A (en) | 2018-05-18 |
Family
ID=62130693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711399304.XA Pending CN108054909A (en) | 2017-12-21 | 2017-12-21 | A kind of compact power supply protecting circuit designed method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108054909A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203708096U (en) * | 2014-01-23 | 2014-07-09 | 中国长城计算机深圳股份有限公司 | Power supply protection circuit and power supply |
-
2017
- 2017-12-21 CN CN201711399304.XA patent/CN108054909A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203708096U (en) * | 2014-01-23 | 2014-07-09 | 中国长城计算机深圳股份有限公司 | Power supply protection circuit and power supply |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180518 |
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| RJ01 | Rejection of invention patent application after publication |