CN207691679U - Power supply circuit with Surge suppression and defencive function - Google Patents
Power supply circuit with Surge suppression and defencive function Download PDFInfo
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- CN207691679U CN207691679U CN201820064473.1U CN201820064473U CN207691679U CN 207691679 U CN207691679 U CN 207691679U CN 201820064473 U CN201820064473 U CN 201820064473U CN 207691679 U CN207691679 U CN 207691679U
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Abstract
The utility model provides a kind of power supply circuit with Surge suppression and defencive function, and the power supply circuit with Surge suppression and defencive function includes surge suppression modules, power conversion module and output protection module；By surge suppression modules, inhibits power-up to start surge, prevent the temporary impact to power supply；By power conversion module, the supply voltage of input is converted into load required voltage, and meet the power demand of load；By output protection module, power conversion module is protected, prevents the back-pressure impact to power conversion module.Advantage is：(1) surge current can be effectively reduced, the damage to prime equipment, the reliability of lifting system are prevented；(2) influence of the back-pressure to parallel electric source module, protection power source module can be prevented；(3) the utility model circuit structure is simple, flexible design, reliability are high.
Description
Technical field
The utility model belongs to power supply circuit design field, and in particular to one kind having Surge suppression and defencive function
Power supply circuit.
Background technology
With greatly developing for China's aerospace industry, novel space satellite product has diversification, complication and big work(
The characteristics of rate, and the requirement to power supply reliability is higher and higher.
During satellite electronic equipment development and design, the DC power supply powered to DC/DC supply convertors, due to various
Reason will produce surge voltage, the input voltage range that amplitude allows often beyond DC/DC supply convertors, to cause
The event of DC/DC supply convertor job insecurities, DC/DC damages happens occasionally, therefore, if design is a kind of to have surge suppression
The power supply circuit of system and defencive function, provides the reliability of power supply circuit, is current thing in the urgent need to address.
Utility model content
In view of the defects existing in the prior art, the utility model provides a kind of power supply with Surge suppression and defencive function
Circuit can effectively solve the above problems.
The technical solution adopted in the utility model is as follows：
The utility model provides a kind of power supply circuit with Surge suppression and defencive function, including surge suppression modules,
Power conversion module and output protection module；
The surge suppression modules include switching circuit, resistor voltage divider circuit and integrating capacitor circuit；Wherein, the switch
Circuit is metal-oxide-semiconductor；The resistor voltage divider circuit includes first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4；
The integrating capacitor circuit includes the first capacitance C1 and the second capacitance C2；
Wherein：First resistor R1 and second resistance R2 are connected in parallel, the first end of first resistor R1 and second resistance R2's
First end links together, and forms node A, and node A is connected to the positive feeder ear of power supply Vcc；The second of first resistor R1
The second end of end and second resistance R2 link together, and form node B；3rd resistor R3 and the 4th resistance R4 are connected in parallel, the
The first end of three resistance R3 and the first end of the 4th resistance R4 link together with node B；The second end of 3rd resistor R3 and
The second end of 4th resistance R4 links together, and forms node C, and node C is connected to the negative feeder ear of power supply Vcc；Therefore,
It is to be connected in series with the 3rd resistor R3 and the 4th resistance R4 being connected in parallel after first resistor R1 and second resistance R2 is connected in parallel
Relationship；After first capacitance C1 and the second capacitance C2 is connected in series with, it is connected in parallel on the both ends of the 4th resistance R4；Metal-oxide-semiconductor Q1, grid connect
Be connected to node B, source electrode is connected to the negative feeder ear of power supply Vcc, drain electrode pass sequentially through the power conversion module and
The output protection module, is connected to the positive input terminal of load.
Preferably, first resistor R1 is identical with the resistance value of second resistance R2 or differs；3rd resistor R3 and the 4th resistance
The resistance value of R4 is identical or differs.
Preferably, the power conversion module includes：Electromagnetic interface filter and DC/DC power modules；The output protection module
Including Schottky diode；
Metal-oxide-semiconductor Q1, drain electrode are connected to the voltage negative input terminal of electromagnetic interface filter；The voltage of the electromagnetic interface filter is just defeated
Enter terminal and is connected to node A；The output voltage terminals of the electromagnetic interface filter are connected to the input terminal of the DC/DC power modules；
The output end of the DC/DC power modules is connected to the positive terminal of the Schottky diode；The Schottky diode is born
The extreme positive input terminal for being connected to load.
Power supply circuit provided by the utility model with Surge suppression and defencive function has the following advantages：
(1) the utility model has surge suppression modules, can effectively reduce surge current, prevent the damage to prime equipment
Wound, the reliability of lifting system；
(2) power conversion module is built as a base unit using the output of single power supply apparatus, by basic single
The pattern of member superposition, output power bigger, and the suitable series in parallel of selection as needed, meet different power demands；
(3) the utility model has power supply output protection module, prevents influence of the back-pressure to parallel electric source module, protection electricity
Source module；
(4) the utility model circuit structure is simple, flexible design, reliability are high.
Description of the drawings
Fig. 1 is that the whole theory structure of the power supply circuit provided by the utility model with Surge suppression and defencive function shows
It is intended to；
Fig. 2 is the particular circuit configurations of the power supply circuit provided by the utility model with Surge suppression and defencive function
Figure；
Fig. 3 is that multiple power supply circuit basic unit parallel connections provided by the utility model build high-power output power supply conversion electricity
The structure chart on road.
Specific implementation mode
To make the purpose of this utility model, technical solution and advantage be more clearly understood, below in conjunction with specific embodiment, and
With reference to attached drawing, the utility model is described in further detail.It should be noted that in attached drawing or specification description, phase
Seemingly or identical part all uses identical figure number.The realization method for not being painted or describing in attached drawing is in technical field
Form known to a person of ordinary skill in the art.In addition, though the demonstration of the parameter comprising particular value can be provided herein, it is to be understood that ginseng
Number is equal to corresponding value without definite, but can be similar to be worth accordingly in acceptable error margin or design constraint.
The utility model provides a kind of power supply circuit with Surge suppression and defencive function, is particularly suitable for space flight electricity
Sub- equipment carries out power supply and distribution, powers on the influence that surge is brought with solution, and improve the reliability of power supply and distribution.
With reference to figure 1, the power supply circuit with Surge suppression and defencive function, including surge suppression modules, power supply modulus of conversion
Block and output protection module；
Surge suppression modules are used to power up the inhibition for starting surge, prevent the temporary impact to power supply；Specifically, comprehensive
The surge and power demand for closing load can be by Surge suppressions to certain limit value by adjusting circuit parameter.
Power conversion module for the supply voltage of input to be converted to load required voltage, and meets the work(of load
Rate demand；
Output protection module prevents the back-pressure impact to power conversion module for being protected to power conversion module.
Fig. 2 is the physical circuit figure of embodiment illustrated in fig. 1.Below in conjunction with Fig. 2, respectively to each composition portion of the present embodiment
Divide and is described in detail.
(1) power supply circuit
In the present embodiment, power supply circuit is DC power supply, and DC output voltage 100V, 0~3300W of output power can
It adjusts.It is emphasized that the utility model is not limited thereto, the power supply circuit DC output voltage can between 25V~
Can be battery or other power supply output equipments between 400V.
In addition, can not also include the power supply circuit in the utility model, and above-mentioned condition be directly met by external world's input
DC voltage, the utility model equally may be implemented.
(2) surge suppression modules
Fig. 2 is please referred to, surge suppression modules include switching circuit, resistor voltage divider circuit and integrating capacitor circuit；Wherein, institute
It is metal-oxide-semiconductor to state switching circuit；The resistor voltage divider circuit includes first resistor R1, second resistance R2,3rd resistor R3 and the 4th
Resistance R4；The integrating capacitor circuit includes the first capacitance C1 and the second capacitance C2；
Wherein：First resistor R1 and second resistance R2 are connected in parallel, the first end of first resistor R1 and second resistance R2's
First end links together, and forms node A, and node A is connected to the positive feeder ear of power supply Vcc；The second of first resistor R1
The second end of end and second resistance R2 link together, and form node B；3rd resistor R3 and the 4th resistance R4 are connected in parallel, the
The first end of three resistance R3 and the first end of the 4th resistance R4 link together with node B；The second end of 3rd resistor R3 and
The second end of 4th resistance R4 links together, and forms node C, and node C is connected to the negative feeder ear of power supply VCC；Therefore,
It is to be connected in series with the 3rd resistor R3 and the 4th resistance R4 being connected in parallel after first resistor R1 and second resistance R2 is connected in parallel
Relationship；After first capacitance C1 and the second capacitance C2 is connected in series with, it is connected in parallel on the both ends of the 4th resistance R4；Metal-oxide-semiconductor Q1, grid connect
It is connected to node B, source electrode is connected to the negative feeder ear of power supply VCC, and drain electrode is connected to the input terminal of power conversion module.
In the surge suppression modules, by the partial pressure of resistor voltage divider circuit, conduction level is provided for metal-oxide-semiconductor, works as Ugs(th)
(metal-oxide-semiconductor gate-to-source on state threshold voltage) ＜ Ugs (metal-oxide-semiconductor grid-source voltage) ＜ UGS (saturation)(metal-oxide-semiconductor gate-to-source
Saturation voltage) when, linear zone is opened and is operated in metal-oxide-semiconductor channel, as Ugs ＞ UGS (saturation)When, metal-oxide-semiconductor is operated in saturation conduction
Area.
In the surge suppression modules, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 are act as
It is divided, turn-on threshold is provided for metal-oxide-semiconductor；After first resistor R1 and second resistance R2 parallel connections, with 3rd resistor R3 in parallel
It is metal-oxide-semiconductor cut-in voltage Ugs with the voltage divided after the 4th resistance R4 series connection, metal-oxide-semiconductor cut-in voltage Ugs should meet MOS
The allowable range of grid voltage when pipe saturation conduction, Ugs={ R3*R4/ (R3+R4) }/{ R1*R2/ (R1+R2)+R3*R4/ (R3+
R4)}*Vcc；In identical charging capacitor, first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance are adjusted
The resistance value of R4, and then adjust metal-oxide-semiconductor cut-in voltage Ugs；Metal-oxide-semiconductor cut-in voltage Ugs is bigger, then surge peak value is opposite reduces；
First capacitance C1 and the second capacitance C2 is charging capacitor, by the charging for setting the first capacitance C1 and the second capacitance C2
Time constant adjusts metal-oxide-semiconductor gate charges time constant, and then controls the metal-oxide-semiconductor saturation conduction time；τ points of charge constant
Section calculates, and τ=τ 1+ τ 2, first segment time constant is calculated by the following formula：τ 1={ R1*R2/ (R1+R2) } * (C1+C2+
CGS), CGSFor metal-oxide-semiconductor gate charge amount；Second segment time constant is started to gate leakage capacitance after C1, C2, CGS complete to charge
Cgd charge, due to Miller effect so that its it is equivalent to ground capacitance Cgd it is very big, it is therefore desirable to charging time it is also longer, τ 2
={ R1*R2/ (R1+R2) } * Cgd, which is in and is clamped state, although switching tube does not have at this time
It is fully on, but switching tube has worked.When Cgd charging completes and when total gate charge being made to reach Ugs values, switching tube is led completely
It is logical, maintenance voltage Ugs={ R3*R4/ (R3+R4) }/{ R1*R2/ (R1+R2)+R3*R4/ (R3+R4) } * Vcc at this time.Charging
Timeconstantτ is bigger, and the metal-oxide-semiconductor saturation conduction time is longer, inhibits the effect of surge current better, powers on the electric current rate of rise and gets over
Small, the duration is longer.
Therefore, which sets metal-oxide-semiconductor saturation conduction thresholding by resistor voltage divider circuit, passes through resistance and electricity
It is installed with constant of fixing time, the time that the amplitude and the rate of rise of surge and holding time is operated in linear zone by metal-oxide-semiconductor determines, i.e.,
The RC charging time determines.
(3) power conversion module
Fig. 2 is please referred to, power conversion module includes：Electromagnetic interface filter and DC/DC power modules；In the present embodiment, DC/DC
It is 100V that power module, which selects IR company AFL12028S, DC input voitage VCC, and output voltage 28V, output power is most
Big 112W.Wherein, the voltage negative input terminal of electromagnetic interface filter is connected to metal-oxide-semiconductor Q1 drain electrodes；The voltage positive input of electromagnetic interface filter
Terminal is connected to node A；The output voltage terminals of electromagnetic interface filter are connected to the input terminal of the DC/DC power modules.DC/DC
The output end of power module is connected to the positive terminal of the Schottky diode.
More specifically, electromagnetic interface filter the 4th end, the 5th end with six end connecting together after, with surge suppression modules
Middle metal-oxide-semiconductor drain electrode is connected；After the 7th end, the 8th end of electromagnetic interface filter link together with the 9th end, with DC/DC power modules
Second end be connected；After the tenth end, the tenth one end of electromagnetic interface filter link together with the 12nd end, with DC/DC power modules
First end be connected；After 7th end of DC/DC power modules is connected with the 10th end, it is connected to the first of Schottky diode D1
End, i.e., it is positive；After 8th end of DC/DC power modules is connected with the 9th end, it is connected to for electricity output ground wire.
The utility model is not limited thereto, which can be by the voltage adjusting end of device in 28V
± 3V is adjusted, and can also be other DC/DC power supply apparatus.
(4) output protection module
Fig. 2 is please referred to, output protection module includes Schottky diode；One Schottky of series connection after DC/DC power modules
Diode, for DC/DC power modules and load between for be electrically isolated.Schottky diode D1, positive terminal are connected to
The output positive terminal of DC/DC power modules, negative pole end are connected to the positive input terminal of load.
Due to the one-way conduction characteristic of Schottky diode, coordinate the load regulation characteristic of DC/DC power modules, it can be effective
The back-pressure for preventing load end pour in down a chimney, play the protective effect to DC/DC power modules, improve the reliability of circuit.
The course of work of the present embodiment is as follows：
Step 1: when power supply does not power on, i.e., for power supply circuit without output voltage, metal-oxide-semiconductor Q1 is in cut-off shape at this time
State, the conversion output of power module no-voltage, circuit idle；
Step 2: when power supply circuit has output voltage, first to the capacitor charging of surge suppression modules, keep Q1 grids electric
Pressure gradually increases, and Q1 is by being linearly conducting to saturation conduction, and VCC voltages are applied to electromagnetic interface filter, power module input after conducting
End exports 28V voltages, the 28V voltages of DC/DC outputs are after Schottky diode by the conversion of electromagnetic interface filter, DC/DC
Output is powered load.
Step 3: adjusting the value size of capacitance C1, C2 and resistance R1, R2, R3, R4, the wherein value of C1, C2 can phase
Deng or it is unequal, can be with capacitance value, in identical divider resistance, capacitance value between 0.001uf~0.22uf
Bigger, then surge peak value is opposite reduces, and the rate of rise also becomes smaller, and the duration is elongated；The value of resistance R1 and R2 can be equal
Or it is unequal, between 200k Ω~500k Ω；The resistance value of resistance R3 and resistance R4 can be equal or unequal, 20k Ω~
Between 100k Ω；After resistance R1 and R2 parallel connection, the voltage that partial pressure obtains of connecting with R3 and R4 in parallel is metal-oxide-semiconductor cut-in voltage
Ugs, the allowable range of grid voltage when metal-oxide-semiconductor cut-in voltage Ugs should meet metal-oxide-semiconductor saturation conduction, Ugs={ R3*R4/ (R3+
R4)}/{R1*R2/(R1+R2)+R3*R4/(R3+R4)}*Vcc；It, can be in identical charging capacitor and identical partial pressure
The size of divider resistance value is adjusted in proportion, and then adjusts metal-oxide-semiconductor cut-in voltage Ugs；Resistance value is bigger, then surge peak value phase
To reducing, the rate of rise also becomes smaller, and the duration is elongated.
First capacitance C1 and the second capacitance C2 is charging capacitor, by the charging for setting the first capacitance C1 and the second capacitance C2
Time constant adjusts metal-oxide-semiconductor gate charges time constant, and then controls the metal-oxide-semiconductor saturation conduction time；τ points of charge constant
Section calculates, and τ=τ 1+ τ 2, first segment timeconstantτ 1 is calculated by the following formula：τ 1={ R1*R2/ (R1+R2) } * (C1+C2+
CGS), CGSFor metal-oxide-semiconductor gate-source capacitance；Second segment timeconstantτ 2 is to work as C1, C2, metal-oxide-semiconductor gate-source capacitance CGSAfter completing charging, open
Begin to charge to metal-oxide-semiconductor gate leakage capacitance Cgd, due to Miller effect so that equivalent metal-oxide-semiconductor gate leakage capacitance Cgd is very big, it is therefore desirable to
Charging time it is also longer, τ 2={ R1*R2/ (R1+R2) } * Cgd, the period metal-oxide-semiconductor grid voltage be in be clamped state,
Although metal-oxide-semiconductor does not have fully at this time, metal-oxide-semiconductor has worked；It waits for metal-oxide-semiconductor gate leakage capacitance Cgd charging completes and makes grid
When total electrical charge reaches Ugs values, metal-oxide-semiconductor is fully on, metal-oxide-semiconductor cut-in voltage Ugs={ R3*R4/ (R3+R4) }/{ R1* at this time
R2/(R1+R2)+R3*R4/(R3+R4)}*Vcc.Charge constant τ is bigger, and the metal-oxide-semiconductor saturation conduction time is longer, inhibits wave
The effect for gushing electric current is better, powers on that the electric current rate of rise is smaller, and the duration is longer.
Those skilled in the art can choose suitable resistance and capacitance according to the model for choosing metal-oxide-semiconductor, and according to DC/
The output power and peak value back-pressure of DC power module choose the Schottky diode D1 of protection module.
Actual test shows the circuit that the present embodiment generates, can effective suppression circuit start surge, to surge amplitude,
The rate of rise, duration are effectively limited.
Using Fig. 2 as basic unit, by the overlay model of basic unit, multiple basic unit parallel connections are built into big work(
Rate output for power conversion circuit, it is each as shown in figure 3, according to actual power demand selection basic unit number in parallel
Road basic unit is merged by diode to be exported, and the reliability for electric output power and circuit is improved.Each basic unit is equal
Respective surge suppression modules parameter can be individually adjusted, makes to start per surge suppression modules staggering time all the way, and then reach drop
It is low to power on surge, play the effect of safeguard protection.
In addition, the above-mentioned definition to each element and method is not limited in the various concrete structures mentioned in embodiment, shape
Shape or mode, those of ordinary skill in the art simply can be changed or replaced to it, such as：
(1) in the present embodiment, the available equipment replacement with power supply fan-out capability of power supply circuit is convenient for the system integration；
(2) NMOS tube circuit can also be substituted directly by switching pmos circuit in surge suppression modules, to power supply buses
Switch over control；
(3) AFL12028S can use other DC/DC devices of meet demand to substitute in DC/DC power modules；
In conclusion the utility model combines the devices such as common metal-oxide-semiconductor and Schottky diode, make full use of MOS's
The characteristic of switching characteristic and diode unilateral conduction designs the power supply circuit with Surge suppression function in conjunction with its advantage.Pass through
Regulation resistance, the size of capacitance, can adjust the limitation of surge, be suitable for the application demand of equipment.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
There should be clear understanding to the utility model.
By above technical scheme it is found that the utility model has the advantages that：
(1) the utility model has surge suppression modules, can effectively reduce surge current, prevent the damage to prime equipment
Wound, the reliability of lifting system；
(2) power conversion module is built as a base unit using the output of single power supply apparatus, by basic single
The pattern of member superposition, output power bigger, and the suitable series in parallel of selection as needed, meet different power demands；
(3) the utility model has power supply output protection module, prevents influence of the back-pressure to parallel electric source module, protection electricity
Source module；
(4) the utility model circuit structure is simple, flexible design, reliability are high.
Particular embodiments described above has carried out into one the purpose of this utility model, technical solution and advantageous effect
Step is described in detail, it should be understood that the foregoing is merely specific embodiment of the utility model, is not limited to this
Utility model, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all wrap
Containing being within the protection scope of the utility model.
Claims (3)
1. a kind of power supply circuit with Surge suppression and defencive function, which is characterized in that turn including surge suppression modules, power supply
Change the mold block and output protection module；
The surge suppression modules include switching circuit, resistor voltage divider circuit and integrating capacitor circuit；Wherein, the switching circuit
For metal-oxide-semiconductor；The resistor voltage divider circuit includes first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4；It is described
Integrating capacitor circuit includes the first capacitance C1 and the second capacitance C2；
Wherein：First resistor R1 and second resistance R2 are connected in parallel, the first end of first resistor R1 and the first of second resistance R2
End links together, and forms node A, and node A is connected to the positive feeder ear of power supply Vcc；The second end of first resistor R1 and
The second end of second resistance R2 links together, and forms node B；3rd resistor R3 and the 4th resistance R4 are connected in parallel, third electricity
The first end of the first end and the 4th resistance R4 that hinder R3 links together with node B；The second end of 3rd resistor R3 and the 4th
The second end of resistance R4 links together, and forms node C, and node C is connected to the negative feeder ear of power supply Vcc；Therefore, first
It is to be connected in series with pass with the 3rd resistor R3 and the 4th resistance R4 being connected in parallel after resistance R1 and second resistance R2 is connected in parallel
System；After first capacitance C1 and the second capacitance C2 is connected in series with, it is connected in parallel on the both ends of the 4th resistance R4；Metal-oxide-semiconductor Q1, grid connection
To node B, source electrode is connected to the negative feeder ear of power supply Vcc, and drain electrode passes sequentially through the power conversion module and institute
Output protection module is stated, the positive input terminal of load is connected to.
2. the power supply circuit according to claim 1 with Surge suppression and defencive function, which is characterized in that first resistor
R1 is identical with the resistance value of second resistance R2 or differs；The resistance value of 3rd resistor R3 and the 4th resistance R4 are identical or differ.
3. the power supply circuit according to claim 1 with Surge suppression and defencive function, which is characterized in that the power supply
Conversion module includes：Electromagnetic interface filter and DC/DC power modules；The output protection module includes Schottky diode；
Metal-oxide-semiconductor Q1, drain electrode are connected to the voltage negative input terminal of electromagnetic interface filter；The voltage positive input terminal of the electromagnetic interface filter
Son is connected to node A；The output voltage terminals of the electromagnetic interface filter are connected to the input terminal of the DC/DC power modules；It is described
The output end of DC/DC power modules is connected to the positive terminal of the Schottky diode；The negative pole end of the Schottky diode
It is connected to the positive input terminal of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820064473.1U CN207691679U (en) | 2018-01-16 | 2018-01-16 | Power supply circuit with Surge suppression and defencive function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820064473.1U CN207691679U (en) | 2018-01-16 | 2018-01-16 | Power supply circuit with Surge suppression and defencive function |
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| Publication Number | Publication Date |
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| CN207691679U true CN207691679U (en) | 2018-08-03 |
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ID=62990884
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063545A (en) * | 2018-01-16 | 2018-05-22 | 中国科学院空间应用工程与技术中心 | Power supply circuit and method of supplying power to Surge suppression and defencive function |
-
2018
- 2018-01-16 CN CN201820064473.1U patent/CN207691679U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063545A (en) * | 2018-01-16 | 2018-05-22 | 中国科学院空间应用工程与技术中心 | Power supply circuit and method of supplying power to Surge suppression and defencive function |
| CN108063545B (en) * | 2018-01-16 | 2023-12-22 | 中国科学院空间应用工程与技术中心 | Power supply circuit with surge suppression and protection functions and power supply method |
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