CN105068636A - Anti-shock surge circuit applied to ruggedized computer - Google Patents
Anti-shock surge circuit applied to ruggedized computer Download PDFInfo
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- CN105068636A CN105068636A CN201510525300.6A CN201510525300A CN105068636A CN 105068636 A CN105068636 A CN 105068636A CN 201510525300 A CN201510525300 A CN 201510525300A CN 105068636 A CN105068636 A CN 105068636A
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Abstract
The invention discloses an anti-shock surge circuit applied to a ruggedized computer, belongs to anti-surge circuits, and solves the problem of power supply failure after surge voltage shock in a power supply system of the ruggedized computer. The technical scheme is that a piezoresistor, a transient voltage suppressor diode and an overvoltage overcurrent protection circuit are connected in parallel, one end of each of the piezoresistor and the transient voltage suppressor diode is connected with the input end of a power supply, and the other end of each of the piezoresistor and the transient voltage suppressor diode is grounded; the overvoltage overcurrent protection circuit comprises an overvoltage protection voltage stabilization chip and a linear field effect transistor, a VCC pin of the overvoltage protection voltage stabilization chip is connected with the input end of the power supply, and an OUT pin of the overvoltage protection voltage stabilization chip is connected with the output end of the power supply; and the drain of the linear field effect transistor is connected with an SNS pin of the overvoltage protection voltage stabilization chip, the gate of the linear field effect transistor is connected with a GATE pin of the overvoltage protection voltage stabilization chip, and the source of the linear field effect transistor is connected with the OUT pin of the overvoltage protection voltage stabilization chip.
Description
Technical field
The present invention relates to a kind of anti-surge circuit, specifically a kind of protecting against shock surge circuit be applied in ruggedized computer.
Background technology
Ruggedized computer (ruggedizedcomputer), for adapting to various rugged surroundings, when Computer Design, on the various factors affecting computing power, as system architecture, electrical specification and mechanical-physical structure etc., take the computing machine of corresponding safeguard measure, also known as severe environment computer.Be characterized in: there is strong environmental suitability, high reliability and Gao Kewei; Stronger processing capability in real time; Seriation, standardization and modularization.
The requirement of security of airborne or vehicle-mounted ruggedized computer to power supply is higher, and the low-voltage dc power supply of airborne or vehicle-mounted ruggedized computer electric power system is generally 24V, but the wherein normal impact surge voltage with below 60V.For ensureing the work of consumer normal reliable in the present context, must can bear the surge voltage impact under this environment, the requirement of namely bearing surge voltage under 24V DC environment is that to bear due to voltage spikes VPK be that the surge voltage of 60V any fault does not occur later.
At present, airborne or vehicle-mounted ruggedized computer electric power system, still exists by after surge voltage impact, occurs the problem of power supply trouble.
Summary of the invention
Technical assignment of the present invention is for above weak point, provides a kind of protecting against shock surge circuit be applied in ruggedized computer.Solve ruggedized computer electric power system, still exist by after surge voltage impact, occur the problem of power supply trouble.
The technical solution adopted for the present invention to solve the technical problems is:
Be applied to the protecting against shock surge circuit in ruggedized computer, comprise connect successively power input Vin, voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit, power output end Vout; Voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit are in parallel, voltage dependent resistor (VDR) RV is all connected power input Vin with one end of transient voltage suppressor diode TVS, the equal ground connection of the other end of voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS; Over-voltage over-current protection circuit comprises overvoltage protection voltage stabilizing chip, linear field effect transistor Q1, and the VCC pin of overvoltage protection voltage stabilizing chip connects power input Vin, and the OUT pin of overvoltage protection voltage stabilizing chip connects power output end Vout; The drain electrode (D) of linear field effect transistor Q1 connects the SNS pin of overvoltage protection voltage stabilizing chip, the grid (G) of linear field effect transistor Q1 connects the GATE pin of overvoltage protection voltage stabilizing chip, and the source electrode (S) of linear field effect transistor Q1 connects the OUT pin of overvoltage protection voltage stabilizing chip; The drain electrode (D) of power input Vin connecting linear field effect transistor Q1 after sampling resistor R1, the source electrode (S) of linear field effect transistor Q1 connects power output end Vout.
Overvoltage protection voltage stabilizing chip adopts LT4356 chip or LT4363 chip.
Resistance R2 and resistance R3 is composed in series voltage comparator; the other end of resistance R2 is connected between the source electrode (S) of linear field effect transistor Q1 and power output end Vout; the other end ground connection of resistance R3, the FB pin of overvoltage protection voltage stabilizing chip is connected to the center tap between resistance R2 and resistance R3 series circuit.
The grid (G) of linear field effect transistor Q1 is connected to the GATE pin of overvoltage protection voltage stabilizing chip after resistance R4; One end of electric capacity C1 is connected between the GATE pin of resistance R4 and overvoltage protection voltage stabilizing chip, the other end ground connection of electric capacity C1.
Linear field effect transistor Q1 adopts the linear field effect transistor of IRLR2908 model.
Transient voltage suppressor diode TVS is 2, and namely transient voltage suppressor diode TVS1 and transient voltage suppressor diode TVS2, is all arranged between voltage dependent resistor (VDR) RV and over-voltage over-current protection circuit.
Resistance R5 connects with electric capacity C2, the other end of power input Vin contact resistance R5, the other end ground connection of electric capacity C2.
Electric capacity C3 is connected power output end Vout with one end of electric capacity C4 parallel circuit, other end ground connection.
Resistance R6 connects with LED 1, and the other end of resistance R6 connects power output end Vout, LED 1 other end ground connection.
TMR pin ground connection after electric capacity C5 of overvoltage protection voltage stabilizing chip.
Voltage dependent resistor (VDR) is a kind of resistance device with nonlinear wind vibration, a kind of votage limit type protection device, is mainly used in carrying out voltage clamping when circuit bears overvoltage, absorbs unnecessary electric current to protect Sensitive Apparatus.Voltage dependent resistor (VDR) first processes impact surge; Utilize the nonlinear characteristic of voltage dependent resistor (VDR), when superpotential appears at two interpolars of voltage dependent resistor (VDR), voltage dependent resistor (VDR) by voltage clamping to a relatively-stationary magnitude of voltage, thus can realize the protection to late-class circuit.
Transient voltage suppressor diode, English full name TransientVoltageSuppressor, is called for short TVS pipe; It is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS pipe are subject to reverse transient state high energy impact events; it can with the speed bearing 12 power second-times of 10; the high impedance of its two interpolar is become Low ESR; absorb the surge power up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value; effectively protect the precision components in electronic circuit, from the damage of various surge pulse.
Of the present inventionly a kind ofly be applied to protecting against shock surge circuit in ruggedized computer compared to the prior art, have the following advantages:
1, have employed voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, overvoltage protection voltage stabilizing chip, linear field effect transistor Q1 as core devices, circuit is simple, reliability is high, can reach indices requirement;
2,24V powers under environment and stablizes to rear class notebook main board power supply after this protecting against shock surge circuit, can dispose impact surge energy in time, improve the reliability of product when airborne or vehicle power have and impact surge; Airborne or vehicle power enter rear first by voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS to impact surge carry out primary treatment, absorb most impact surge energy, the small voltage shock wave that then may also remain is poured into into late-class circuit, carry out over-voltage over-current protection circuit process by overvoltage protection voltage stabilizing chip again, fully ensure the reliability of power supply input;
3, be applicable in airborne or vehicle-mounted ruggedized computer.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Accompanying drawing 1 is a kind of structured flowchart of the protecting against shock surge circuit be applied in ruggedized computer;
Accompanying drawing 2 is a kind of circuit diagram of the protecting against shock surge circuit be applied in ruggedized computer.
In Fig. 2: vehicle power is connected to voltage input end Vin, voltage output end Vout connects notebook mainboard.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1:
A kind of protecting against shock surge circuit be applied in ruggedized computer of the present invention, its structure comprise connect successively power input Vin, voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit, power output end Vout; Voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit are in parallel, voltage dependent resistor (VDR) RV is all connected power input Vin with one end of transient voltage suppressor diode TVS, the equal ground connection of the other end of voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS; Over-voltage over-current protection circuit comprises overvoltage protection voltage stabilizing chip, linear field effect transistor Q1, and the VCC pin of overvoltage protection voltage stabilizing chip connects power input Vin, and the OUT pin of overvoltage protection voltage stabilizing chip connects power output end Vout; The drain electrode (D) of linear field effect transistor Q1 connects the SNS pin of overvoltage protection voltage stabilizing chip, the grid (G) of linear field effect transistor Q1 connects the GATE pin of overvoltage protection voltage stabilizing chip, and the source electrode (S) of linear field effect transistor Q1 connects the OUT pin of overvoltage protection voltage stabilizing chip; The drain electrode (D) of power input Vin connecting linear field effect transistor Q1 after sampling resistor R1, the source electrode (S) of linear field effect transistor Q1 connects power output end Vout.
Overvoltage protection voltage stabilizing chip adopts LT4356 chip.LT4356 chip is the surge protection chip that Linear Techn Inc.'s (LinearTechnologyCorporation is called for short Linear) releases.
Resistance R2 and resistance R3 is composed in series voltage comparator; the other end of resistance R2 is connected between the source electrode (S) of linear field effect transistor Q1 and power output end Vout; the other end ground connection of resistance R3, the FB pin of overvoltage protection voltage stabilizing chip is connected to the center tap between resistance R2 and resistance R3 series circuit.
The grid (G) of linear field effect transistor Q1 is connected to the GATE pin of overvoltage protection voltage stabilizing chip after resistance R4; One end of electric capacity C1 is connected between the GATE pin of resistance R4 and overvoltage protection voltage stabilizing chip, the other end ground connection of electric capacity C1.
Linear field effect transistor Q1 adopts the linear field effect transistor of IRLR2908 model.
In LT4356 chip, pin function is as follows:
FB pin 1:Feedback, level pressure feed back input pin, between the output that pin passes through a divider resistance and GND, for determining output voltage;
OUT pin 2: voltage output pin;
GATE pin 3: gate control input signal pin;
SNS pin 4: current sensing signal input pin;
VCC pin 5: supply voltage input pin;
SHDN pin 6: overhead control signal input pin;
FLT pin 7: fault output pin;
EN pin 8: enable pin;
GND pin 9: grounding pin;
TMR pin 10: protecting against shock surge time input pin.
The protecting against shock surge circuit of the present embodiment, pcb board adopts 2 laminates, and power input Vin and power output end Vout is separately positioned on the pcb board of different layers, isolate, components' placement has taken into full account size and position, ensures Electro Magnetic Compatibility, ensures that the device layout of circuit board is reasonable.
The protecting against shock surge circuit of the present embodiment; during use; first voltage dependent resistor (VDR) RV first processes impact surge; utilize the nonlinear characteristic of voltage dependent resistor (VDR) RV; when superpotential appears at two interpolars of voltage dependent resistor (VDR) RV; voltage dependent resistor (VDR) RV by voltage clamping to a relatively-stationary magnitude of voltage, thus can realize the protection to late-class circuit.Transient voltage suppressor diode TVS is in parallel with protected circuit in the circuit board; after instantaneous voltage exceedes circuit normal working voltage; transient voltage suppressor diode TVS just produces snowslide; be supplied to momentary current super-low resistance path; consequently momentary current is drawn away through transient voltage suppressor diode TVS; avoid protected element, and before voltage resume normal value, make protected loop remain off voltage always.After transient pulse terminates, transient voltage suppressor diode TVS recovers high-impedance state automatically, and whole loop enters normal voltage.For thoroughly eliminating the impact impacting surge, after voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS, there is over-voltage over-current protection circuit.This partial circuit have employed the LT4356 chip of Linear Tech and linear field effect transistor IRLR2908 is core devices.LT4356 is a kind of overvoltage protection voltage stabilizer that Linear Tech releases, and this device can carry out overvoltage and overcurrent protection simultaneously, for the downstream components such as avionic device provide segment protect reliably.Its operating voltage range is 4V ~ 80V, can process the transient voltage that 100V is even higher, and provides the reverse input protection being low to moderate-60V not causing self and load under the prerequisite of damage.FB pin feedback voltage and a 1.25V reference voltage are relatively carried out the output of control GATE pin with the voltage protection function of realizing circuit by a voltage comparator by LT4356 chip.When there is overvoltage protection; in timing cycle, LT4356 chip GATE pin control linear field effect transistor Q1 continues to keep conducting; until when the time exceedes the timing cycle of setting, GATE pin control linear field effect transistor Q1 turns off, and ensures that system keeps the temporary impact surge voltage in certain hour.This partial circuit sets the overvoltage protection of protecting against shock surge, overcurrent protection and protecting against shock surge protection time respectively.
Embodiment 2:
A kind of protecting against shock surge circuit be applied in ruggedized computer of the present invention, its structure comprise connect successively power input Vin, voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit, power output end Vout; Voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit are in parallel, voltage dependent resistor (VDR) RV is all connected power input Vin with one end of transient voltage suppressor diode TVS, the equal ground connection of the other end of voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS; Over-voltage over-current protection circuit comprises overvoltage protection voltage stabilizing chip, linear field effect transistor Q1, and the VCC pin of overvoltage protection voltage stabilizing chip connects power input Vin, and the OUT pin of overvoltage protection voltage stabilizing chip connects power output end Vout; The drain electrode (D) of linear field effect transistor Q1 connects the SNS pin of overvoltage protection voltage stabilizing chip, the grid (G) of linear field effect transistor Q1 connects the GATE pin of overvoltage protection voltage stabilizing chip, and the source electrode (S) of linear field effect transistor Q1 connects the OUT pin of overvoltage protection voltage stabilizing chip; The drain electrode (D) of power input Vin connecting linear field effect transistor Q1 after sampling resistor R1, the source electrode (S) of linear field effect transistor Q1 connects power output end Vout.
Overvoltage protection voltage stabilizing chip adopts LT4363 chip.LT4363 chip is the surge protection chip that Linear Techn Inc.'s (LinearTechnologyCorporation is called for short Linear) releases.
Resistance R2 and resistance R3 is composed in series voltage comparator; the other end of resistance R2 is connected between the source electrode (S) of linear field effect transistor Q1 and power output end Vout; the other end ground connection of resistance R3, the FB pin of overvoltage protection voltage stabilizing chip is connected to the center tap between resistance R2 and resistance R3 series circuit.
The grid (G) of linear field effect transistor Q1 is connected to the GATE pin of overvoltage protection voltage stabilizing chip after resistance R4; One end of electric capacity C1 is connected between the GATE pin of resistance R4 and overvoltage protection voltage stabilizing chip, the other end ground connection of electric capacity C1.
Linear field effect transistor Q1 adopts the linear field effect transistor of IRLR2908 model.
Transient voltage suppressor diode TVS is 2, and namely transient voltage suppressor diode TVS1 and transient voltage suppressor diode TVS2, is all arranged between voltage dependent resistor (VDR) RV and over-voltage over-current protection circuit.
Resistance R5 connects with electric capacity C2, the other end of power input Vin contact resistance R5, the other end ground connection of electric capacity C2.
Electric capacity C3 is connected power output end Vout with one end of electric capacity C4 parallel circuit, other end ground connection.
Resistance R6 connects with LED 1, and the other end of resistance R6 connects power output end Vout, LED 1 other end ground connection.
TMR pin ground connection after electric capacity C5 of overvoltage protection voltage stabilizing chip.
In the present embodiment,
overvoltage protection design is as follows:the overvoltage protection magnitude of voltage of this circuit is 32V, when input is more than 32V, its magnitude of voltage is clamped at 32V.FB pin feedback voltage and a 1.25V reference voltage are relatively carried out the output of control GATE pin with the voltage protection function of realizing circuit by a voltage comparator by LT4363 chip.Resistance R2 and resistance R3 links the FB pin of LT4363 chip; when there is overvoltage protection; in timing cycle, LT4363 chip GATE pin controls line style field effect transistor Q1 continuation maintenance conducting; until when the time exceedes the timing cycle of setting; GATE pin control linear field effect transistor Q1 turns off; still work under guarantee system impact surge voltage within a certain period of time, according to output clamping voltage VREG be 32V calculate overvoltage protection time two divider resistances--the value of resistance R2 and resistance R3.If during overvoltage protection, be 250uA, R3=1.25V/250uA=5K Ω by the electric current of resistance R2 and resistance R3, actually get 4.99K Ω.R2=(32V-1.25V) R5/1.25V=122.7K Ω, actually gets 124K Ω.
overcurrent protection design is as follows:the maximum operating currenbt of this circuit is set to 5A, circuit shut-down after electric current is more than 5A certain hour.By the pressure drop control LT4363 chip GATE pin at sampling resistor R1 two ends to realize protecting against shock surge current function.The pressure drop of sampling resistor R1 two ends VCC pin and SNS pin is compared with inner 50mV reference voltage, enters overcurrent protection when sampling resistor R1 pressure drop is greater than 50mV.SNS pin is minimum can be operated in-60V, and the pressure drop of SNS pin and VCC pin can not more than 30V.If without overcurrent protection function, SNS pin directly can be connected with VCC pin.The design's sampling resistor R1 gets 10m Ω, realizes Current Limits and fixes on below 5A: I=50mV/RSNS1=I=50mV/10m Ω=5A.
impact the setting of surge duration:have within a certain period of time owing to impacting surge, when occurring impacting surge, protecting against shock surge circuit is in process rear class being carried out to pressure-limit current-limit, exceed circuit shut-down after this time, to impact surge energy overheated too for a long time and cause damage because absorbing to prevent linear field effect transistor Q1.It is realize by adding electric capacity at the TMR pin of LT4363 chip that protecting against shock surge time is arranged.Because two-stage voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS process impact surge above; impact surge to this part pressure current foldback circuit is smaller; it is 2ms that surge time is impacted in setting, and after exceeding this setting-up time, circuit exports and turns off.Calculate the capacitance of TMR pin timing capacitor C5: CTMR=(2ms*5uA)/100mV=0.1uF.
By embodiment above, described those skilled in the art can be easy to realize the present invention.But should be appreciated that the present invention is not limited to above-mentioned embodiment.On the basis of disclosed embodiment, described those skilled in the art can the different technical characteristic of combination in any, thus realizes different technical schemes.
Claims (10)
1. be applied to the protecting against shock surge circuit in ruggedized computer, it is characterized in that comprising connect successively power input Vin, voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit, power output end Vout;
Voltage dependent resistor (VDR) RV, transient voltage suppressor diode TVS, over-voltage over-current protection circuit are in parallel, voltage dependent resistor (VDR) RV is all connected power input Vin with one end of transient voltage suppressor diode TVS, the equal ground connection of the other end of voltage dependent resistor (VDR) RV and transient voltage suppressor diode TVS;
Over-voltage over-current protection circuit comprises overvoltage protection voltage stabilizing chip, linear field effect transistor Q1, and the VCC pin of overvoltage protection voltage stabilizing chip connects power input Vin, and the OUT pin of overvoltage protection voltage stabilizing chip connects power output end Vout;
The drain electrode of linear field effect transistor Q1 connects the SNS pin of overvoltage protection voltage stabilizing chip, and the grid of linear field effect transistor Q1 connects the GATE pin of overvoltage protection voltage stabilizing chip, and the source electrode of linear field effect transistor Q1 connects the OUT pin of overvoltage protection voltage stabilizing chip;
The drain electrode of power input Vin connecting linear field effect transistor Q1 after sampling resistor R1, the source electrode of linear field effect transistor Q1 connects power output end Vout.
2. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1, is characterized in that overvoltage protection voltage stabilizing chip adopts LT4356 chip or LT4363 chip.
3. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 2; it is characterized in that resistance R2 and resistance R3 is composed in series voltage comparator; the other end of resistance R2 is connected between the source electrode of linear field effect transistor Q1 and power output end Vout; the other end ground connection of resistance R3, the FB pin of overvoltage protection voltage stabilizing chip is connected to the center tap between resistance R2 and resistance R3 series circuit.
4. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 2, is characterized in that the grid of linear field effect transistor Q1 is connected to the GATE pin of overvoltage protection voltage stabilizing chip after resistance R4; One end of electric capacity C1 is connected between the GATE pin of resistance R4 and overvoltage protection voltage stabilizing chip, the other end ground connection of electric capacity C1.
5. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1, is characterized in that linear field effect transistor Q1 adopts the linear field effect transistor of IRLR2908 model.
6. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1; it is characterized in that transient voltage suppressor diode TVS is 2; namely transient voltage suppressor diode TVS1 and transient voltage suppressor diode TVS2, is all arranged between voltage dependent resistor (VDR) RV and over-voltage over-current protection circuit.
7. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1, is characterized in that resistance R5 connects with electric capacity C2, the other end of power input Vin contact resistance R5, the other end ground connection of electric capacity C2.
8. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1, is characterized in that electric capacity C3 is connected power output end Vout with one end of electric capacity C4 parallel circuit, other end ground connection.
9. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 1, is characterized in that resistance R6 connects with LED 1, and the other end of resistance R6 connects power output end Vout, LED 1 other end ground connection.
10. a kind of protecting against shock surge circuit be applied in ruggedized computer according to claim 2, is characterized in that the TMR pin of overvoltage protection voltage stabilizing chip ground connection after electric capacity C5.
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| WO2019024364A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市光峰光电技术有限公司 | Power conversion circuit and projector |
| CN108233351A (en) * | 2018-01-16 | 2018-06-29 | 四川安迪科技实业有限公司 | A kind of Surge suppression protector |
| CN109462219A (en) * | 2018-11-30 | 2019-03-12 | 广州海格通信集团股份有限公司 | A kind of electrical system surge voltage-suppressing circuit and its surging voltage suppressing method |
| US11277002B2 (en) | 2019-05-13 | 2022-03-15 | Mersen Usa Ep Corp. | Surge protection device for the protection of multiple DC or AC power lines |
| CN110912095A (en) * | 2019-11-14 | 2020-03-24 | 中国航空工业集团公司西安航空计算技术研究所 | Overvoltage and impact current resistant starting circuit |
| CN111211549A (en) * | 2020-01-15 | 2020-05-29 | 天地（常州）自动化股份有限公司 | Intrinsic safety output port surge protection circuit |
| CN117543962A (en) * | 2024-01-09 | 2024-02-09 | 四川大学 | IC integrated circuit power supply system powered by +3.3V or +5V voltage |
| CN117543962B (en) * | 2024-01-09 | 2024-04-16 | 四川大学 | IC integrated circuit power supply system powered by +3.3V or +5V voltage |
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