CN107154611A - Power protecting circuit based on MAX14586 chips - Google Patents
Power protecting circuit based on MAX14586 chips Download PDFInfo
- Publication number
- CN107154611A CN107154611A CN201710486699.0A CN201710486699A CN107154611A CN 107154611 A CN107154611 A CN 107154611A CN 201710486699 A CN201710486699 A CN 201710486699A CN 107154611 A CN107154611 A CN 107154611A
- Authority
- CN
- China
- Prior art keywords
- max14586
- chips
- ovlo
- electric capacity
- circuit
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of power protecting circuit based on MAX14586 chips, circuit is controlled including OVLO, MAX14586 chips, power filtering unit, the electric routing resistance R24 of OVLO controls 1 end is concatenated with resistance R25 2 ends to be formed, hinder R25 1 end ground connection, two IN ends and connect in MAX14586 chips, two OUT terminals simultaneously connect, GND ends are grounded, power filtering unit is by electric capacity C240, C220 and 1 end for meeting rear 1 end tandem electric inductance coil FB5, 2 ends are grounded, electric capacity C16, C34 and 2 ends for meeting rear 1 end tandem electric inductance coil FB5, 2 ends are grounded, integrated circuit is connected as OVLO and controls 2 ends of resistance R24 in circuit to be connected for input with the IN ends of MAX14586 chips, 1 end is connected with the OVLO ends of MAX14586 chips, the electric capacity C240 of MAX14586 chips OUT terminal connection power filtering unit 1 end, the electric capacity C34 of power filtering unit 1 end is output end.The chip realized and rear end is protected when input voltage is excessive is had the technical effect that, destructive loss is prevented, the highest protection reachable+36V of voltage, by soft start, is reduced in surge current, 15 milliseconds and started stabilization.
Description
Technical field
The present invention relates to a kind of power protecting circuit, more particularly to a kind of power protection electricity based on MAX14586 chips
Road.
Background technology
Power protecting circuit has a variety of forms of protection, wherein, including input over under-voltage protection circuit, output overvoltage/undervoltage guarantor
Protection circuit, output overcurrent protection circuit, output short circuit protection circuit etc. is substantially to small voltage overvoltage crowbar, at present
We can reach the demand of 36V excessive voltage protection circuit to protection voltage, has put on the agenda and.For example, airborne receive
Machine, which is powered, needs the voltage protection requirement of 28V even more highs；Prevent airborne anti-interference antenna input voltage from damaging equipment higher than 28V
Deng.
The content of the invention
In view of the need for the problem of prior art is present and reality, the present invention provides a kind of electricity based on MAX14586 chips
Protection circuit, this circuit belongs to power conversion circuit, is designed using isolated gate FET (MOSFET), utilizes semiconductor table
The electroacoustic effect in face is operated, by controlling outside input resistance to control OVLO input values, to set overvoltage protection numerical value,
Concrete technical scheme is that a kind of power protecting circuit based on MAX14586 chips, including OVLO control circuit, MAX14586 cores
Piece, power filtering unit, it is characterised in that：The electric routing resistance R24 of OVLO controls 1 end is concatenated with resistance R25 2 ends to be formed,
Hinder R25 1 end ground connection, in MAX14586 chips two IN ends and connect, two OUT terminals and connect, GND ends ground connection, power filter list
Member is by electric capacity C240, C220 and connects rear 1 end tandem electric inductance coil FB5 1 end, 2 ends ground connection, 1 end string after electric capacity C16, C34 simultaneously connect
Connect inductance coil FB5 2 ends, 2 ends ground connection, integrated circuit be connected as OVLO control 2 ends of resistance R24 in circuit for input and
The IN ends connection of MAX14586 chips, 1 end are connected with the OVLO ends of MAX14586 chips, MAX14586 chips OUT terminal connection electricity
The electric capacity C240 of source filter unit 1 end, the electric capacity C34 of power filtering unit 1 end is output end.
The solution have the advantages that, the chip that rear end is protected when input voltage is excessive is realized, is prevented destructive
Loss, the highest protection reachable+36V of voltage, by soft start, reduces in surge current, 15 milliseconds and starts stabilization.
Brief description of the drawings
Fig. 1 is circuit structure diagram of the invention.
Embodiment
As shown in figure 1, the power protecting circuit based on MAX14586 chips, including OVLO controls circuit, MAX14586 cores
Piece, power filtering unit, OVLO control circuit by controlling between resistance ratio to control the magnitude of voltage of overvoltage protection,
The processing of MAX14586 chip internal circuits, mainly sets internal OVLO threshold values and realizes excessively stream heat shutoff etc., power filter electricity
Road filters out the clutter with bypass circuit, makes power supply signal purer.
The electric routing resistance R24 of OVLO controls 1 end is concatenated with resistance R25 2 ends to be formed, resistance R25 1 end ground connection,
In MAX14586 chips two IN ends and connect, two OUT terminals and connect, GND ends ground connection, power filtering unit by electric capacity C240,
C220 simultaneously connects rear 1 end tandem electric inductance coil FB5 1 end, 2 ends ground connection, and electric capacity C16, C34 simultaneously meet rear 1 end tandem electric inductance coil FB5
2 ends, 2 ends ground connection, integrated circuit is connected as OVLO and control 2 ends of resistance R24 in circuit to be input and MAX14586 chips
The connection of IN ends, 1 end be connected with the OVLO ends of MAX14586 chips, MAX14586 chips OUT terminals connects power filtering unit
Electric capacity C240 1 end, the electric capacity C34 of power filtering unit 1 end is output end.OVLO controls the overvoltage protection magnitude of voltage of circuit
(VIN_OLV0) establishing method beWherein, VOVLOFor the internal threshold voltage of MAX14586 chips
(about 7V ± 29%), R24=1M Ω, R in circuit can be calculated by desired overvoltage protection value25Value；MAX14586
Chip provides small-sized 8 pin TDFN encapsulation, with the encapsulation of naked pad, is operated in -40 DEG C to+85 DEG C and extends level temperature range
Threshold voltage is 7V representative values, there is 3A continuous current ability, 40m Ω (representative value) n-channel MOSFET switch；Power filter
Unit can substantially filter out the noise signal in power supply signal by capacitive bypass and magnetic bead filtering, can effectively prevent noise signal
Influence the work of other chips.
Embodiment one
Power protecting circuit based on MAX14586 chips is accessed into receiver voltage input end, based on MAX14586 chips
Power protecting circuit OVLO control circuits in resistance R24 2 ends and resistance R25 1 end shunt-wound capacitance C1 be followed by external electricity
Source, during work, the circuit input+5V operating voltages export pure+5V operating voltages, are effectively protected receiver power supply
Power supply unit, and pure+5V power supply signals can be provided.Using overvoltage protector MAX14586, he has low 48m Ω (allusion quotations
Offset) conducting resistance (RON) inside FET and error protection voltage low-voltage system provide be up to+36V input voltages, exceed
Overvoltage threshold, internal FET is closed, with the electricity of any 4V between preventing damage from wanting protection element, overvoltage protection threshold adjustable
Pressure and the optional non-essential resistances of 20V.Selected as OVLO inputs are set less than outside OVLO gate voltages, equipment automatically selects interior
The accurate stroke threshold value in portion.
Claims (1)
1. a kind of power protecting circuit based on MAX14586 chips, including OVLO controls circuit, MAX14586 chips, power supply filter
Ripple unit, it is characterised in that：The electric routing resistance R24 of OVLO controls 1 end is concatenated with resistance R25 2 ends to be formed, and hinders R25 1 end
Ground connection, in MAX14586 chips two IN ends and connect, two OUT terminals and connect, GND ends ground connection, power filtering unit is by electric capacity
C240, C220 simultaneously connect rear 1 end tandem electric inductance coil FB5 1 end, 2 ends ground connection, and electric capacity C16, C34 simultaneously connect rear 1 end tandem electric inductance line
FB5 2 ends, 2 ends ground connection is enclosed, integrated circuit is connected as OVLO and controls 2 ends of resistance R24 in circuit to be input and MAX14586
The IN ends connection of chip, 1 end are connected with the OVLO ends of MAX14586 chips, MAX14586 chips OUT terminal connection power filter list
The electric capacity C240 of member 1 end, the electric capacity C34 of power filtering unit 1 end is output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710486699.0A CN107154611A (en) | 2017-06-23 | 2017-06-23 | Power protecting circuit based on MAX14586 chips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710486699.0A CN107154611A (en) | 2017-06-23 | 2017-06-23 | Power protecting circuit based on MAX14586 chips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107154611A true CN107154611A (en) | 2017-09-12 |
Family
ID=59796048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710486699.0A Pending CN107154611A (en) | 2017-06-23 | 2017-06-23 | Power protecting circuit based on MAX14586 chips |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107154611A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201146464Y (en) * | 2007-12-13 | 2008-11-05 | 福建星网锐捷网络有限公司 | Power supply conversing device |
| CN205355857U (en) * | 2015-12-31 | 2016-06-29 | 深圳宝砾微电子有限公司 | Protection circuit and multivoltage fill chip soon based on multivoltage transform |
-
2017
- 2017-06-23 CN CN201710486699.0A patent/CN107154611A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201146464Y (en) * | 2007-12-13 | 2008-11-05 | 福建星网锐捷网络有限公司 | Power supply conversing device |
| CN205355857U (en) * | 2015-12-31 | 2016-06-29 | 深圳宝砾微电子有限公司 | Protection circuit and multivoltage fill chip soon based on multivoltage transform |
Non-Patent Citations (1)
| Title |
|---|
| MAXIM研发人员: "《MAXIM公司芯片技术手册》", 31 December 2011 * |
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Legal Events
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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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170912 |
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| WD01 | Invention patent application deemed withdrawn after publication |