CN109324222A - Quick detection of power loss system and method based on reverse exciting topological - Google Patents
Quick detection of power loss system and method based on reverse exciting topological Download PDFInfo
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- CN109324222A CN109324222A CN201811407547.8A CN201811407547A CN109324222A CN 109324222 A CN109324222 A CN 109324222A CN 201811407547 A CN201811407547 A CN 201811407547A CN 109324222 A CN109324222 A CN 109324222A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
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Abstract
A kind of quick detection of power loss system and method based on reverse exciting topological, the system are added forward converter in secondary output winding side and are used for detection of power loss；This forward converter is used for detection of power loss, which includes the rectification circuit being sequentially connected in series, filter circuit, bleeder circuit, protection circuit and signal conversion circuit；The digital signal that power down generates finally is given to single-chip microcontroller.On the basis of not influencing the electric supply system of original reverse exciting topological, the energy that input side electrolysis stores after power down generation is effectively utilized and carries out data preservation for single-chip microcontroller.
Description
Technical field
The present invention relates to a kind of quick detection of power loss system and method based on reverse exciting topological, can pass through parameter
Adjustment and setting are adjusted power down threshold value, and the preferable energy for utilizing input terminal high-voltage electrolytic capacitor increases power down and saves
Time does not influence the electric supply system of original reverse exciting topological, is particularly suitable for having higher requirements for the power down holding time
Occasion.
Background technique
Single-chip microcontroller leads to unexpected power down when operating normally for some reason, it will it is inner to lose data storage (RAM)
Data.Such as measure in certain applications, control field, single-chip microcontroller work normally in acquire and calculate some important numbers
According to needing to restore these significant datas after powering on next time.Therefore, in some single chip application systems without backup system
In system, it is necessary to which before system is fully powered-off, these collected or calculated significant datas, there are in EEPROM.Institute
It is saved so that single-chip microcontroller power-fail detection circuit and single-chip microcontroller power failure data can all be added in such systems under normal circumstances.This will
It asks after power down generation, power supply will lay in certain energy and carry out power failure data preservation for single-chip microcontroller.For the deficiency for avoiding energy
And waste, it is desirable to which power down can be quickly detected power-off signal after being sent to.
In order to ensure that single-chip microcontroller carries out power down preservation after power down generation, the way of traditional reverse exciting topological is to input
After the switch controller of side stops working, load output voltage can decline slowly, set by way of electric resistance partial pressure at this time
Power down threshold value, when load output voltage is lower than threshold value, single-chip microcontroller carries out the storage of data, and the energy saved for power down is main
It is provided by outlet side electrolytic capacitor.Holding time longer occasion is required certain, the electrolytic capacitor of outlet side will not only design
Capacity it is very big, quantity is also more.Design cost is both increased in this way, and a large amount of space is also occupied in PCB design.
Summary of the invention
Single-chip microcontroller is not enough to carry out data preservation after the purpose of the present invention solves the power-supply system power down of reverse exciting topological
The problem of, a kind of quick power failure detection method is proposed to improve the holding time.It is exported in the load of reverse exciting topological Switching Power Supply
Forward converter is added in circuit, for quickly detecting power down, flexible setting power down threshold value can be carried out, effectively according to demand
Using input terminal electrolytic capacitor energy carry out data storage.
The technical scheme is that
A kind of quick detection of power loss system based on reverse exciting topological, the power circuit of aforementioned reverse exciting topological includes power supply
V1, switch S1, transformer T1, diode D3, resistance R5, capacitor C3, C4 and electrolytic capacitor E1, power supply V1 are the defeated of Switching Power Supply
Enter supply voltage, the primary input winding of switch S1, power supply V1 and transformer T1 are sequentially connected in series；The secondary output of transformer T1 around
Group shunt load resistance R6, resistance R5, capacitor C3, C4 and electrolytic capacitor E1 are as filtering device；The system secondary output around
Group side is added forward converter and is used for detection of power loss；This forward converter is only used for fast power down quick detection circuit, does not influence original anti-
The electric supply system of exciting topological, be effectively utilized input side electrolysis after power down generation the energy that stores for single-chip microcontroller into
Row data save.
Further, which includes rectification circuit, filter circuit, the bleeder circuit, protection being sequentially connected in series
Circuit and signal conversion circuit；The digital signal that power down generates finally is given to single-chip microcontroller.
Further, rectification circuit includes diode D1, and filter circuit includes capacitor C1；Purpose be by secondary windings side just
AC signal when swashing output is converted to direct current signal, when load output is rectified into reversed rectification, detection of power loss rectification output electricity
Pressure is negative voltage；When load output is rectified into positive rectification, detection of power loss rectifier output voltage is forward voltage.
Further, the bleeder circuit includes resistance R1, R2 and R3；By electric resistance partial pressure by the high voltage of input terminal
It is reduced to suitable low-voltage, the selection of resistance will fully consider the ability to bear of rear end triode and the function of resistance itself
Consumption, load output rectifier system is different, and bleeder circuit also can be different.
Further, the protection circuit includes diode D2, right when preventing input supply voltage excessively high or is too low
The device of rear stage damages.
Further, the signal conversion circuit includes triode Q1 and resistance R4, the base stage of the triode Q1
Connecing the tie point of resistance R2 and R3 in bleeder circuit, the other end series resistance R4 of resistance R3 connects the collector of triode Q1, and three
The emitter of pole pipe Q1 is grounded；Aforementioned resistance R4 is pull-up resistor, and one end connects microcontroller power supply, one end connecting triode Q1 collection
The collector of electrode, triode Q1 connects detection of power loss signal MCU_INT.When input supply voltage is less than the power down threshold value of setting
When voltage, detection of power loss signal MCU_INT will do it the conversion of level.When load output is rectified into positive rectification, detection of power loss
Signal MCU_INT is high level by low transition；When load output is rectified into negative sense rectification, detection of power loss signal MCU_INT
Low level is converted to by high level.
A method of applied to the quick detection of power loss system based on reverse exciting topological, method includes the following steps:
The secondary windings output of S1, transformer T1 are rectified by diode D1, friendship when secondary windings side normal shock is exported
Stream signal is converted to direct current signal；
S2, aforementioned direct current signal are filtered by capacitor C1, export stable direct current signal；
S3, divider resistance R1, R2 and R3 are reduced to suitable low-voltage to the high voltage of aforementioned direct current signal；
The voltage generated after S4, partial pressure controls triode Q1 after the protection of diode D2, by analog signal
Digital signal is converted to, resistance R4 is the pull-up resistor of power-off signal, and the collector of triode Q1 and the tie point of resistance R4 are made
It is connected for detection of power loss signal output end detection signal input part corresponding with MCU；
S5, when the level for detecting aforementioned detection of power loss signal output end jumps, generate power-off signal, that is, input
Supply voltage V1 is jumped with preset threshold voltage difference.
Beneficial effects of the present invention:
The present invention devises a kind of design that quick detection of power loss is carried out using reverse exciting topological Switching Power Supply, utilizes secondary
Forward converter is added in secondary output winding side in the principle for exporting the work of winding flyback, which is only used for detection of power loss
System.One threshold value is set to input supply voltage as needed, adjusts the parameter of corresponding component, drops to threshold in input power
When threshold voltage, which can provide detection of power loss signal, and at this moment energy of the single-chip microcontroller for saving data is existing from input terminal
The energy of electrolytic capacitor, there are also the energy of outlet side electrolytic capacitor, and do not influence normal electric supply system.Due to input
Side is high-voltage electrolytic capacitor, and pressure difference is bigger, and the energy comparison of storage is sufficient, considerably increases the time of power down preservation.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Detailed description of the invention
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 shows the functional block diagram of the quick power-fail detection circuit based on reverse exciting topological.
Fig. 2 shows the realities that the load output rectifier system based on reverse exciting topological is power-fail detection circuit when reversely rectifying
Border schematic diagram.
Fig. 3 shows quick power-fail detection circuit when the output rectifier system of the load based on reverse exciting topological rectifies for forward direction
Actual principle figure.
It is when reversely rectifying that Fig. 4, which shows the output rectifier system of the load based on reverse exciting topological, and power input voltage is big
Simulation result diagram when power down threshold voltage.
It is when reversely rectifying that Fig. 5, which shows the output rectifier system of the load based on reverse exciting topological, and power input voltage is small
Simulation result diagram when power down threshold voltage.
When Fig. 6 shows the output rectifier system of the load based on reverse exciting topological as positive rectification, power input voltage is big
Simulation result diagram when power down threshold voltage.
When Fig. 7 shows the output rectifier system of the load based on reverse exciting topological as positive rectification, power input voltage is small
Simulation result diagram when power down threshold voltage.
Specific embodiment
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.
It as shown in connection with fig. 1, is the functional block diagram of the quick power-fail detection circuit based on reverse exciting topological, power-fail detection circuit
Comprising rectification circuit, filter circuit, bleeder circuit, protection circuit and signal conversion circuit, the number for finally generating power down is believed
Number it is given to single-chip microcontroller.The characteristics of power-fail detection circuit is the preferable energy for utilizing input terminal high-voltage electrolytic capacitor, increases power down
Holding time, and at low cost, circuit is simple, flexible with comparison of getting up, be particularly suitable for having the power down holding time compared with
High request occasion.
The physical circuit figure of the detection of power loss based on reverse exciting topological is shown in conjunction with Fig. 2, Fig. 3.Fig. 2 is that load output is whole
Circuit diagram when stream mode is reversed rectification；Fig. 3 is the circuit diagram loaded when output rectifier system is positive rectification.Secondary windings
Output is rectified by diode D1, and AC signal when secondary windings side normal shock is exported is converted to direct current signal, load output
When rectifier system is reversed rectification, detection of power loss rectification output is negative voltage；When load output rectifier system is positive rectification,
Detection of power loss rectification output is forward voltage.Direct current signal is filtered by capacitor C1, exports stable direct current signal.Point
Piezoresistance R1, resistance R2 and resistance R3 are reduced to suitable low-voltage to the direct current signal of generation, and direct current signal is negative voltage
When, the one end divider resistance R3 meets single-chip microcontroller supply voltage VDD, one end series resistor R1 and resistance R2；Direct current signal is positive electricity
When pressure, the one end divider resistance R3 ground connection, one end series resistor R1 and resistance R2.The voltage generated after partial pressure is by diode D2's
After protection, triode Q1 is controlled, converts analog signals into digital signal, resistance R4 is the pull-up electricity of power-off signal
Resistance.In conjunction with the above circuit, when input supply voltage is lower than threshold voltage, power-off signal is that will do it level conversion.
Giving the output rectifier system of the load based on reverse exciting topological in conjunction with Fig. 4, Fig. 5 is different electricity when reversely rectifying
Simulation result diagram under the input voltage of source.Giving the output rectifier system of the load based on reverse exciting topological in conjunction with Fig. 6, Fig. 7 is
Simulation result diagram when forward direction rectification, under different electrical power input voltage.Threshold voltage is uniformly set as DC200V, in figure power supply V3 and
Switch S1 collectively constitutes high-frequency switching signal；Power supply V1 is input supply voltage；Power supply V2 is single-chip microcontroller supply voltage, is made here
With 3.3V power supply；Load output voltage is set as DC13V, and detection of power loss signal is the same schematic diagram of remaining device of MCU_INT..Fig. 4 is
Input supply voltage is 210V, and greater than the threshold voltage of setting, the voltage after divider resistance divides, which is less than triode Q1, is led
Be powered pressure, and triode Q1 can be ended, and detecting signal at this time is high level；Fig. 5 input supply voltage is 190V, less than setting
Threshold voltage, the voltage after divider resistance divides are greater than triode Q1 conducting voltage, and triode Q1 can be switched on, single-chip microcontroller
Detection signal be low level.Loading output rectifier system in conjunction with Fig. 4, Fig. 5 is when reversely rectifying, and power-fail detection circuit detects
After power down, detection of power loss signal becomes low level from high level.Fig. 6 is that input supply voltage is 210V, greater than the threshold value of setting
Voltage, the voltage after divider resistance divides are greater than triode Q1 conducting voltage, and triode Q1 can be switched on, at this time detection letter
Number be low level；Fig. 7 input supply voltage is 190V, the voltage less than the threshold voltage of setting, after divider resistance divides
Less than triode Q1 conducting voltage, triode Q1 can be ended, and the detection signal of single-chip microcontroller is high level.It is negative in conjunction with Fig. 6, Fig. 7
When load output rectifier system is positive rectification, after power-fail detection circuit detects power down, detection of power loss signal is become from low level
High level.
When specific implementation:
The power-fail detection circuit based on reverse exciting topological that the present invention introduces adjusts point given threshold voltage
The resistance value of piezoresistance resistance R1, R2 and R3, when its input supply voltage is lower than input threshold voltage, detection of power loss output signal
It will do it level conversion.Specifically, it includes following two mode:
Embodiment one:
Based on reverse exciting topological, when load output is reversely rectifies, threshold voltage is set as DC200V.Input supply voltage
When for 210V, greater than the threshold voltage of setting, the voltage after divider resistance divides is less than triode Q1 conducting voltage, three poles
Pipe Q1 can be ended, and detecting signal at this time is high level；When input supply voltage is 190V, greater than the threshold voltage of setting, warp
Voltage after crossing divider resistance partial pressure is greater than triode Q1 conducting voltage, and triode Q1 can be switched on, the detection signal of single-chip microcontroller
For low level, load power source output voltage is steady dc voltage.
Embodiment two:
Based on reverse exciting topological, when load output rectifies for forward direction, threshold voltage is set as DC200V.Input supply voltage
When for 210V, greater than the threshold voltage of setting, the voltage after divider resistance divides is greater than triode Q1 conducting voltage, three poles
Pipe Q1 can be switched on, and detecting signal at this time is low level；When input supply voltage is 190V, less than the threshold voltage of setting, warp
Voltage after crossing divider resistance partial pressure is less than triode Q1 conducting voltage, and triode Q1 can be ended, the detection signal of single-chip microcontroller
For high level, load power source output voltage is steady dc voltage.
It is not enough to carry out after quick power-fail detection circuit effective solution based on reverse exciting topological of the invention power down
The problem of data save can carry out flexible setting power down threshold value, and not for load-side electric power output voltage according to demand
It has an impact.Circuit in the present invention is simple, at low cost, and small power consumption is practical, the quick inspection of power-off signal easy to accomplish
It surveys, the preferable energy for utilizing input terminal high-voltage electrolytic capacitor increases the power down holding time.Can very easily put into largely makes
With.The quick power-fail detection circuit based on reverse exciting topological in invention can be applied to presently, there are most of inverse-excitation types open up
In the electric supply system flutterred.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (7)
1. a kind of quick detection of power loss system based on reverse exciting topological, the power circuit of aforementioned reverse exciting topological includes power supply
V1, switch S1, transformer T1, diode D3, resistance R5, capacitor C3, C4 and electrolytic capacitor E1, power supply V1 are the defeated of Switching Power Supply
Enter supply voltage, the primary input winding of switch S1, power supply V1 and transformer T1 are sequentially connected in series；The secondary output of transformer T1 around
Group shunt load resistance R6, resistance R5, capacitor C3, C4 and electrolytic capacitor E1 are as filtering device；It is characterized in that, the system exists
Secondary output winding side is added forward converter and is used for detection of power loss.
2. the quick detection of power loss system according to claim 1 based on reverse exciting topological, which is characterized in that power down inspection
Examining system includes the rectification circuit being sequentially connected in series, filter circuit, bleeder circuit, protection circuit and signal conversion circuit.
3. the quick detection of power loss system according to claim 2 based on reverse exciting topological, which is characterized in that rectification circuit
Including diode D1, filter circuit includes capacitor C1.
4. the quick detection of power loss system according to claim 2 based on reverse exciting topological, which is characterized in that point
Volt circuit includes resistance R1, R2 and R3.
5. the quick detection of power loss system according to claim 2 based on reverse exciting topological, which is characterized in that the guarantor
Protection circuit includes diode D2, for protecting the device of rear stage.
6. the quick detection of power loss system according to claim 2 based on reverse exciting topological, which is characterized in that the letter
Number conversion circuit includes triode Q1 and resistance R4, and the base stage of the triode Q1 meets the company of resistance R2 and R3 in bleeder circuit
Contact, the other end series resistance R4 of resistance R3 connect the collector of triode Q1, the emitter ground connection of triode Q1.
7. a kind of method applied to the quick detection of power loss system described in one of claim 1-6 based on reverse exciting topological,
It is characterized by: method includes the following steps:
The secondary windings output of S1, transformer T1 are rectified by diode D1, and exchange when secondary windings side normal shock is exported is believed
Number be converted to direct current signal；
S2, aforementioned direct current signal are filtered by capacitor C1, export stable direct current signal；
S3, divider resistance R1, R2 and R3 are reduced to suitable low-voltage to the high voltage of aforementioned direct current signal；
The voltage generated after S4, partial pressure controls triode Q1, analog signal is converted after the protection of diode D2
For digital signal, resistance R4 is the pull-up resistor of power-off signal, and the collector of triode Q1 and the tie point of resistance R4 are used as
Power detection signal output end detection signal input part corresponding with MCU is connected；
S5, when the level for detecting aforementioned detection of power loss signal output end jumps, generate power-off signal, i.e. input power
Voltage V1 is jumped with preset threshold voltage difference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811407547.8A CN109324222A (en) | 2018-11-23 | 2018-11-23 | Quick detection of power loss system and method based on reverse exciting topological |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811407547.8A CN109324222A (en) | 2018-11-23 | 2018-11-23 | Quick detection of power loss system and method based on reverse exciting topological |
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| CN201811407547.8A Pending CN109324222A (en) | 2018-11-23 | 2018-11-23 | Quick detection of power loss system and method based on reverse exciting topological |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109979512A (en) * | 2019-04-28 | 2019-07-05 | 浙江万松电气有限公司 | The circuit and method that power down Flash is saved are realized in the embedded system powered by linear power supply |
| CN110058145A (en) * | 2019-05-07 | 2019-07-26 | 苏州格美芯微电子有限公司 | A kind of low-power chip power-fail detection circuit |
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
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| CN109979512A (en) * | 2019-04-28 | 2019-07-05 | 浙江万松电气有限公司 | The circuit and method that power down Flash is saved are realized in the embedded system powered by linear power supply |
| CN110058145A (en) * | 2019-05-07 | 2019-07-26 | 苏州格美芯微电子有限公司 | A kind of low-power chip power-fail detection circuit |
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
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Application publication date: 20190212 |