CN107785874A - Power protection method, apparatus and circuit - Google Patents
Power protection method, apparatus and circuit Download PDFInfo
- Publication number
- CN107785874A CN107785874A CN201610767357.1A CN201610767357A CN107785874A CN 107785874 A CN107785874 A CN 107785874A CN 201610767357 A CN201610767357 A CN 201610767357A CN 107785874 A CN107785874 A CN 107785874A
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- Prior art keywords
- current signal
- circuit
- power supply
- conversion
- switch
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
Abstract
The invention provides a kind of power protection method, apparatus and circuit, wherein, the power protecting circuit includes：Assists winding, the voltage for the inductance both ends in sampling switch power supply；Capacitance-resistance RC charging circuits, are connected with the assists winding, and the photovoltaic conversion for the assists winding to be sampled is current signal；Control circuit, for according to the current signal, controlling the switch of the Switching Power Supply.By the present invention, the problem of mode for solving overcurrent protection in correlation technique has protection circuit complexity, and cost is high, and then raising power density, the effect of development cost is reduced.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of power protection method, apparatus and circuit.
Background technology
Switching Power Supply all develops towards the efficient target of high power density at present, raising power density, one
Direction is in device level selection, e.g., is encapsulated from equivalent specifications smaller；Another direction is to improve switching frequency, enters one
Step reduces magnetic part volume.But switching frequency can not be improved unrestrictedly, mainly be limited by switching loss.And improve electricity
Source efficiency is except from soft switch topology, outside new component, multiphase interleaving is also as high-efficiency high-capacity density power supply
One of means.Although multichannel crisscross parallel can reduce the component of selection and the grade of magnetic part, efficiency is improved, it is defeated to reduce input
Many advantages, such as going out ripple, but advantage equally causes shortcoming, it is how staggered it is relatively single-phase for mean multiple transformers
Or multiple inductance, it is unfavorable so to improving power density.Therefore it is close in order to can not only improve efficiency but also power can be improved
Degree, the topology of multiphase ecotone magnetic coupling inductance are arisen at the historic moment, and their two-phase or multiphase shared secondary magnetic cores, winding is independent, more
Magnetic flux between phase is mutually superimposed, this topology input serial or parallel connection, output-parallel.For this topology, if desired do
Overcurrent protection, each phase are required for increasing protection circuit.If without short circuit and overcurrent protection function, any small probability
Overload or short circuit can all make power supply component damage, and serious meeting causes power supply on fire, and harm is bigger.
In existing excessively stream or short-circuit protection circuit, more commonly used mode is former for sampling output secondary current and sampling
Side electric current is protected.Sampled output current signal do protection it is simple and clear because when output short-circuit, output current can increase
Greatly, reach threshold value and close driving, mode is very clear and definite, and shortcoming is exactly the electric current that the circuit can not detect secondary windings short circuit, also with regard to nothing
The protection of method response output Transformer Winding short circuit.And sample primary current signal and do protection with regard to there is no drawbacks described above, sampling original
The mode of side current signal generally has the sampling of resistance sampling summation current transformer, and current transformer is sampled and made in high power power
With more, which sample rate current precision is higher, and it is small to sample loss, can also realize former secondary isolation, but defect is electricity
Current transformer volume is relatively large, especially in multichannel crisscross parallel topology, is required for a current transformer per road, from into
Consider it is all unacceptable in this and power density.
It can be seen that the problem of in correlation technique there is protection circuit complexity in the mode of overcurrent protection, and cost is high.
The content of the invention
The embodiments of the invention provide a kind of power protection method, apparatus and circuit, at least to solve mistake in correlation technique
The problem of there is protection circuit complexity in the mode of stream protection, cost is high.
According to one embodiment of present invention, there is provided a kind of power protecting circuit, including：Assists winding, for sampling
The voltage at the inductance both ends in Switching Power Supply；Capacitance-resistance RC charging circuits, are connected with the assists winding, for by it is described auxiliary around
The photovoltaic conversion of group sampling is current signal；Control circuit, for according to the current signal, controlling opening for the Switching Power Supply
Close.
Alternatively, the electric current also includes：Filter circuit, for the current signal enter the control circuit it
Before, the current signal is filtered, obtains the filtered current signal.
Alternatively, the electric current also includes：Rectification circuit, it is connected with the RC charging circuits, for the institute after conversion
State current signal and carry out rectification, obtain the current signal after rectification, the current signal after rectification is sent to described
Control circuit.
Alternatively, the control circuit includes：Decision circuitry and drive circuit, wherein, the decision circuitry, for basis
The current signal, and predetermined current reference value, obtain the drive signal for controlling the drive circuit；The driving electricity
Road, it is connected with the decision circuitry, for the drive signal according to acquisition, drives the opening and closing of the Switching Power Supply.
According to another embodiment of the invention, there is provided a kind of power protection method, including：Sampled by assists winding
The voltage at the inductance both ends in Switching Power Supply；It is current signal by the photovoltaic conversion that the assists winding samples to obtain；According to institute
Current signal is stated, controls the switch of the Switching Power Supply.
Alternatively, the current signal after according to conversion, before the switch for controlling the Switching Power Supply, in addition to：
The current signal after conversion is filtered, obtains the filtered current signal.
Alternatively, the current signal after according to conversion, before the switch for controlling the Switching Power Supply, in addition to：
Rectification is carried out to the current signal after conversion, obtains the current signal after rectification.
Alternatively, according to the current signal, controlling the switch of the Switching Power Supply includes：According to the current signal,
And predetermined current reference value, obtain the drive signal for controlling the Switching Power Supply driving；According to the driving of acquisition
Signal, drive the opening and closing of the Switching Power Supply.
According to another embodiment of the invention, there is provided a kind of apparatus for protecting power supply, including：Sampling module, for leading to
The voltage at the inductance both ends crossed in assists winding sampling switch power supply；Conversion module, for sampling to obtain the assists winding
Photovoltaic conversion be current signal；Control module, for according to the current signal, controlling the switch of the Switching Power Supply.
Alternatively, described device also includes：Filtration module, for being filtered to the current signal after conversion, obtain
Obtain the filtered current signal.
Alternatively, described device also includes：Rectification module, for carrying out rectification to the current signal after conversion, obtain
Obtain the current signal after rectification.
Alternatively, the control module includes：Obtaining unit, for being joined according to the current signal, and predetermined current
Value is examined, obtains the drive signal for controlling the Switching Power Supply driving；Control unit, for being believed according to the driving of acquisition
Number, drive the opening and closing of the Switching Power Supply.
According to still another embodiment of the invention, a kind of storage medium is additionally provided.The storage medium is arranged to storage and used
In the program code for performing following steps：Pass through the voltage at the inductance both ends in assists winding sampling switch power supply；Will be described auxiliary
The photovoltaic conversion for helping winding to sample to obtain is current signal；According to the current signal, the switch of the Switching Power Supply is controlled.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：After according to conversion
The current signal, before the switch for controlling the Switching Power Supply, in addition to：The current signal after conversion is filtered
Ripple, obtain the filtered current signal.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：After according to conversion
The current signal, before the switch for controlling the Switching Power Supply, in addition to：The current signal after conversion is carried out whole
Stream, obtain the current signal after rectification.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：Believed according to the electric current
Number, controlling the switch of the Switching Power Supply includes：According to the current signal, and predetermined current reference value, obtain for controlling
Make the drive signal of the Switching Power Supply driving；According to the drive signal of acquisition, the opening and closing of the Switching Power Supply is driven.
By the present invention, employ assists winding and the voltage at the inductance both ends in Switching Power Supply is sampled, pass through RC
The photovoltaic conversion that charging current obtains sampling is electric current, uses current transformer, therefore, can solve correlation due to avoiding
The problem of mode of overcurrent protection has protection circuit complexity in technology, and cost is high, reaches and improves power density, and reduction is opened
Send out the effect of cost.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structured flowchart of power protecting circuit according to embodiments of the present invention；
Fig. 2 is the schematic diagram of assists winding over-current detection circuit according to the preferred embodiment of the invention；
Fig. 3 is the circuit diagram of assists winding all-wave over-current detection circuit according to the preferred embodiment of the invention；
Fig. 4 is the circuit diagram of assists winding half-wave over-current detection circuit according to the preferred embodiment of the invention；
Fig. 5 is the flow chart of power protection method according to embodiments of the present invention；
Fig. 6 is the structured flowchart one of apparatus for protecting power supply according to embodiments of the present invention；
Fig. 7 is the structured flowchart two of apparatus for protecting power supply according to embodiments of the present invention；
Fig. 8 is the structured flowchart three of apparatus for protecting power supply according to embodiments of the present invention；
Fig. 9 is the structured flowchart of the control module 66 of apparatus for protecting power supply according to embodiments of the present invention.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.
Embodiment 1
The power protecting circuit that the present embodiment 1 is provided can be connected to Switching Power Supply or similar have inductance and need
In the device for wanting excessively stream or short-circuit protection.Fig. 1 is the structured flowchart of power protecting circuit according to embodiments of the present invention.Such as Fig. 1
Shown, power protecting circuit 10 can include：Assists winding 12, RC charging circuits 14 and control circuit 16, wherein,
Assists winding 12, the voltage for the inductance both ends in sampling switch power supply.
RC charging circuits 14, it is connected with the assists winding 12, the photovoltaic conversion for assists winding to be sampled is electric current
Signal；
Control circuit 16, for according to current signal, the switch of controlling switch power supply.
By foregoing circuit, assists winding samples to the voltage at the inductance both ends in Switching Power Supply, is charged by RC
The photovoltaic conversion that electric current obtains sampling is electric current, uses current transformer due to avoiding, solves excessively stream in correlation technique
The problem of mode of protection has protection circuit complexity, and cost is high, improves power density, reduces development cost.
Alternatively, the power protecting circuit 10 can also include filter circuit, and the filter circuit can be used in the electric current
Signal enters before control circuit 16, and current signal is filtered, obtains filtered current signal.By filtered electric current
Signal sends the switch of the controlling switch power supply of control circuit 16 to.
By the above-mentioned technical proposal of the embodiment of the present invention, current signal is filtered using filter circuit, can be disappeared
Except the spike burr of signal so that current signal is cleaner, improves the accuracy of Switching Power Supply control.
Alternatively, the power protecting circuit 10 can also include rectification circuit, for being carried out to the current signal after conversion
Rectification, the current signal after rectification is obtained, the current signal after rectification is sent to control circuit 16.It will be believed by rectification circuit
Number become forward signal.Here rectified current can be full-wave rectification electric current or half-wave rectifying circuit.It can also lead to
Cross negative clamping circuit and pressure clamper is carried out to signal.
By the above-mentioned technical proposal of the embodiment of the present invention, signal is become into forward signal using rectification circuit, is easy to control
Circuit processed is controlled according to current signal to the switch of Switching Power Supply, improves the convenience of Switching Power Supply control.
Alternatively, control circuit 16 can include：Decision circuitry and drive circuit, wherein, decision circuitry, for according to electricity
Signal, and predetermined current reference value are flowed, obtains the drive signal for controlling drive circuit；Drive circuit, with decision circuitry
It is connected, for the drive signal according to acquisition, the opening and closing of driving switch power supply.Decision circuitry can be comparator, predetermined current
Reference value can be that setting or the input according to user during operation are set user in advance based on experience value
It is fixed.Drive circuit can be that hardware lockout drives, or dsp software judges block drive circuit.
By the above-mentioned technical proposal of the embodiment of the present invention, above-mentioned control is realized using by decision circuitry and drive circuit
Circuit, improve the convenience of Switching Power Supply control.
Based on above-described embodiment and optional embodiment, to illustrate that the whole flow process of scheme interacts, in this preferred embodiment
In, there is provided a kind of assists winding over-current detection circuit (acting on above-mentioned power protecting circuit), it can be used for having multichannel magnetic
Coupling or the protection without the similar topological output short-circuit such as magnetic-coupled inductance or primary side excessively stream.Below to the assists winding excessively stream
Detection circuit illustrates.
The assists winding current foldback circuit mainly utilizes resonant inductance or boost inductance or coupling in all kinds of electric source topologies
The voltage that inductance etc. participates in energy transmission inductance is closed, under output overcurrent or short-circuit condition, its both end voltage can steeply rise, and lead to
Cross an additional inductance assists winding and sample out both end voltage indirectly, voltage is then reduced into by RC charging circuits by electricity again
Signal is flowed, then by rectification and filtering and comparator circuit, is sent into control circuit block driving.
Specifically, the assists winding over-current detection circuit, includes all-wave or halfwave rectifier, filter circuit.Assists winding goes out
The voltage signal come makes ratio above electric capacity C restore inductor current signal, then pass through rectifying and wave-filtering electricity by RC charging circuits
The signal that can be used as trigger protection is obtained behind road, is sent into logic judging circuit.(can be soft for above-mentioned logic judging circuit
Part judges or hardware judges), switching signal is obtained after the current signal detected is sent into comparator, gives Digital Signal Processing
Device (Digital Signal Processor, referred to as DSP) or hardware logic electric circuit close driving.
By this protected mode, former secondary current is sampled without extra increase current transformer or resistance, only need to be
Extra increase by one assists winding (multichannel magnetic coupling inductance can also only need an assists winding) and additional one above inductance
RC detection circuits (acting on foregoing RC charging circuits), can just sample the electric current in inductance indirectly, error is small, follows effect
It is good, it can reliably be used as the trigger signal of power supply excessively stream.
The structure of assists winding over-current detection circuit is specifically described below.
Fig. 2 is the schematic diagram of assists winding over-current detection circuit according to the preferred embodiment of the invention.For there is power
Factor correcting (Power Factor Correction, referred to as PFC) boost inductance, LLC resonant inductances, BUCK (decompression) filters
The topology of the similar inductive function such as ripple inductance, assists winding over-current detection circuit is a kind of circuit easy to use.The circuit is again
Six hardware circuit units can be subdivided into.As described in Figure 2, the assists winding over-current detection circuit includes：
Inductance assists winding 22 (is acted on foregoing assists winding), for obtaining the original edge voltage of inductance by preset ratio.
In excessively stream, inductance both end voltage meeting rapid increase, can pass through increases a n on inductance:1 auxiliary around
Group (the inductance assists winding 20 i.e. shown in Fig. 2 can realize such function) obtains the electricity at inductance both ends according to preset ratio
Pressure.Mainly according to primary side inductive drop and the number of turns, loss is determined for the selection of inductance and the assists winding turn ratio, target be allow auxiliary around
The magnitude of voltage of group above is much larger than the magnitude of voltage above electric capacity above RC detection circuits.
RC integration currents detection circuit 24 (acting on foregoing RC charging circuits), for the electricity obtained to inductance assists winding
Pressure signal is handled, and inductor current signal is restored according to preset ratio.
RC integration currents detection circuit 24 can mainly be waited using capacitance voltage initial ramp-up phase in RC charging circuits
Imitate as linear rise, capacitance voltage is followed inductive current in real time, and in order to which the capacitance integral of elimination influences to lead
Cause electric discharge not in time, RC selected can be that R impedances are long-range small with electric capacity C capacitive reactance, that is, electric capacity C capacitance.
Rectification circuit 26, the voltage signal for being detected to RC carry out rectification.
Rectification circuit 26 (for example, all-wave detects circuit or half-wave detects circuit) is passed through by the voltage signal that RC is detected
Become forward voltage signal.Whether all-wave or halfwave rectifier are used, mainly need to be determined according to actual circuit, if only sampled
With regard to energy reliably protecting, that is possible half-wave current signal using half-wave detection and all-wave detection.
Filter circuit 28, for being filtered to the voltage signal after rectification.
Voltage signal after over commutation can eliminate spike burr by circuit (for example, RC filter circuits) after filtering,
It can so make the input end signal of arrival comparator circuit 210 cleaner, prevent from malfunctioning.For in RC filter circuits
Electric capacity C values can not be too big, for example, can be within 50pF, in order to avoid integrating effect may have a strong impact on voltage follow.
Comparator circuit 210 (is acted on foregoing decision circuitry), for believing filtered voltage signal and overcurrent protection
Number (Vref) be compared, generate the switching signal for controlling control logic unit 212.
Control logic unit 212 (is acted on foregoing drive circuit), for opening according to switching signal controlling switch power supply
Close.
The signal exported by comparator circuit 210, can give control logic unit 212 to realize control, control is patrolled
Hardware control logic or software DSP control logics can be included by collecting the logic judgment of unit 212.Software control logic realize mainly by
DSP TZ pin triggering, which is interrupted, closes driving, and hardware control logic mainly depends on hardware controls integrated circuit (Integrated
Circuit, referred to as IC) protection pin realize.
For rectification circuit, full-wave rectifying circuit or half-wave rectifying circuit can be used to handle signal, divided below
The other hardware circuit to full-wave rectification and halfwave rectifier illustrates.
Fig. 3 is the circuit diagram of assists winding all-wave over-current detection circuit according to the preferred embodiment of the invention, and Fig. 4 is basis
The circuit diagram of the assists winding half-wave over-current detection circuit of the preferred embodiment of the present invention, as shown in Figure 3 and Figure 4, assists winding is complete
The difference of ripple over-current detection circuit and assists winding half-wave over-current detection circuit essentially consists in difference (the RC products of rectifier circuit portion
Point current detection circuit is change according to the phone of rectification circuit type)：The rectified current of assists winding all-wave over-current detection circuit
Road is full-wave rectifying circuit 32, and the rectification circuit of assists winding half-wave over-current detection circuit is half-wave rectifying circuit 42.
In the above-mentioned technical proposal of the preferred embodiment of the present invention, there is provided a kind of simple DC-DC or AC-DC converter
Excessively stream or short-circuit protection circuit.The applicable topology of this preferred embodiment is not limited to LLC, PSFB (Phase Shifted Full
Bridge, phase-shifting full-bridge), PFC is other to have the topology for participating in main loop of power circuit working inductance to be also suitable, and is particularly suitable for having magnetic
The topology of coupling inductance.It is high power switching power supply excessively stream or short-circuit protection by the above-mentioned technical proposal of the embodiment of the present invention
Scheme a kind of easy to use and inexpensive is provided.Using this protected mode, to improve power density reduce exploitation into
Originally good effect is played.
Embodiment 2
A kind of power protection method is provided in the present embodiment, and this method may operate in provided in above-described embodiment
Power protecting circuit on.Fig. 5 is the flow chart of power protection method according to embodiments of the present invention, as shown in figure 5, the flow
Comprise the following steps：
Step S502, pass through the voltage at the inductance both ends in assists winding sampling switch power supply；
Step S504, it is current signal by the photovoltaic conversion that assists winding samples to obtain；
Step S506, according to the current signal, the switch of controlling switch power supply.
Alternatively, before step S506, this method can also include：Current signal after conversion is filtered, obtained
Obtain filtered current signal.
Alternatively, before step S506, this method can also include：Rectification is carried out to the current signal after conversion, obtained
Obtain the current signal after rectification.
Alternatively, step S506 can include：According to current signal, and predetermined current reference value, obtain for controlling
The drive signal of Switching Power Supply driving；According to the drive signal of acquisition, the opening and closing of driving switch power supply.
Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation
The method of example can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but a lot
In the case of the former be more preferably embodiment.Based on such understanding, technical scheme is substantially in other words to existing
The part that technology contributes can be embodied in the form of software product, and the computer software product is stored in a storage
In medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, calculate
Machine, server, or network equipment etc.) perform method described in each embodiment of the present invention.
Embodiment 3
A kind of apparatus for protecting power supply is additionally provided in the present embodiment, and the device is used to realize above-described embodiment and preferred reality
Mode is applied, had carried out repeating no more for explanation.As used below, term " module " can realize the soft of predetermined function
The combination of part and/or hardware.Although device described by following examples is preferably realized with software, hardware, or
The realization of the combination of software and hardware is also what may and be contemplated.
Fig. 6 is the structured flowchart one of apparatus for protecting power supply according to embodiments of the present invention, as shown in fig. 6, the device includes：
Sampling module 62, conversion module 64, control module 66, are illustrated to the device below.
Sampling module 62, for the voltage by the inductance both ends in assists winding sampling switch power supply；Conversion module 64,
It is connected with above-mentioned sampling module 62, the photovoltaic conversion for sampling to obtain the assists winding is current signal；Control module
66, it is connected with above-mentioned conversion module 64, for according to the current signal, controlling the switch of the Switching Power Supply.
Fig. 7 is the structured flowchart two of apparatus for protecting power supply according to embodiments of the present invention, as shown in fig. 7, the device is except bag
Include outside all modules shown in Fig. 6, in addition to：
Filtration module 72, it is connected with the conversion module 64 and control module 66, for entering to the current signal after conversion
Row filtering, obtains filtered current signal.
Fig. 8 is the structured flowchart three of apparatus for protecting power supply according to embodiments of the present invention, as shown in figure 8, the device is except bag
Include outside all modules shown in Fig. 6, in addition to：
Rectification module 82, it is connected with the conversion module 64 and control module 66, for entering to the current signal after conversion
Row rectification, obtain the current signal after rectification.
Fig. 9 is the structured flowchart of the control module 66 of apparatus for protecting power supply according to embodiments of the present invention, as described in Figure 9,
The control module 66 includes：
Obtaining unit 92, for according to current signal, and predetermined current reference value, obtaining and being driven for controlling switch power supply
Dynamic drive signal；
Control unit 94, it is connected with above-mentioned obtaining unit 92, for the drive signal according to acquisition, driving switch power supply
Opening and closing.
It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong
Cross in the following manner realization, but not limited to this：Above-mentioned module is respectively positioned in same processor；Or above-mentioned modules are with any
The form of combination is located in different processors respectively.
Embodiment 4
Embodiments of the invention additionally provide a kind of storage medium.Alternatively, in the present embodiment, above-mentioned storage medium can
The program code for performing following steps to be arranged to storage to be used for：
S1, pass through the voltage at the inductance both ends in assists winding sampling switch power supply；
S2, it is current signal by the photovoltaic conversion that assists winding samples to obtain；
S3, according to current signal, the switch of controlling switch power supply.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：
Current signal after according to conversion, before the switch of controlling switch power supply, in addition to：Electric current after conversion is believed
Number it is filtered, obtains filtered current signal.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：
Current signal after according to conversion, before the switch of controlling switch power supply, in addition to：Electric current after conversion is believed
Number carry out rectification, obtain rectification after current signal.
Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：
According to current signal, the switch of controlling switch power supply includes：
S1, according to current signal, and predetermined current reference value, obtain the driving letter for controlling switch power drives
Number；
S2, according to the drive signal of acquisition, the opening and closing of driving switch power supply.
Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or
CD etc. is various can be with the medium of store program codes.
Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：Pass through auxiliary
The voltage at the inductance both ends in winding sampling switch power supply；It is current signal by the photovoltaic conversion that assists winding samples to obtain；Root
According to current signal, the switch of controlling switch power supply.
Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：Turn in basis
Current signal after change, before the switch of controlling switch power supply, in addition to：Current signal after conversion is filtered, obtained
Filtered current signal.
Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：Turn in basis
Current signal after change, before the switch of controlling switch power supply, in addition to：Rectification is carried out to the current signal after conversion, obtained
Current signal after rectification.
Alternatively, in the present embodiment, processor performs according to the program code stored in storage medium：According to electric current
Signal, the switch of controlling switch power supply include：According to current signal, and predetermined current reference value, obtain for controlling switch
The drive signal of power drives；According to the drive signal of acquisition, the opening and closing of driving switch power supply.
Alternatively, the specific example in the present embodiment may be referred to described in above-described embodiment and optional embodiment
Example, the present embodiment will not be repeated here.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein
The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
- A kind of 1. power protecting circuit, it is characterised in that including：Assists winding, the voltage for the inductance both ends in sampling switch power supply；Capacitance-resistance RC charging circuits, are connected with the assists winding, and the photovoltaic conversion for the assists winding to be sampled is electric current Signal；Control circuit, for according to the current signal, controlling the switch of the Switching Power Supply.
- 2. circuit according to claim 1, it is characterised in that also include：Filter circuit, for before the current signal enters the control circuit, being filtered, obtaining to the current signal Obtain the filtered current signal.
- 3. circuit according to claim 1, it is characterised in that also include：Rectification circuit, it is connected with the RC charging circuits, for carrying out rectification to the current signal after conversion, obtains rectification The current signal afterwards, the current signal after rectification is sent to the control circuit.
- 4. circuit according to any one of claim 1 to 3, it is characterised in that the control circuit includes：Decision circuitry And drive circuit, wherein,The decision circuitry, for according to the current signal, and predetermined current reference value, obtaining for controlling the driving The drive signal of circuit；The drive circuit, it is connected with the decision circuitry, for the drive signal according to acquisition, drives the switch electricity The opening and closing in source.
- A kind of 5. power protection method, it is characterised in that including：Pass through the voltage at the inductance both ends in assists winding sampling switch power supply；It is current signal by the photovoltaic conversion that the assists winding samples to obtain；According to the current signal, the switch of the Switching Power Supply is controlled.
- 6. according to the method for claim 5, it is characterised in that the current signal after according to conversion, described in control Before the switch of Switching Power Supply, in addition to：The current signal after conversion is filtered, obtains the filtered current signal.
- 7. according to the method for claim 5, it is characterised in that the current signal after according to conversion, described in control Before the switch of Switching Power Supply, in addition to：Rectification is carried out to the current signal after conversion, obtains the current signal after rectification.
- 8. the method according to any one of claim 5 to 7, it is characterised in that according to the current signal, described in control The switch of Switching Power Supply includes：According to the current signal, and predetermined current reference value, the driving letter for controlling the Switching Power Supply driving is obtained Number；According to the drive signal of acquisition, the opening and closing of the Switching Power Supply is driven.
- A kind of 9. apparatus for protecting power supply, it is characterised in that including：Sampling module, for the voltage by the inductance both ends in assists winding sampling switch power supply；Conversion module, the photovoltaic conversion for sampling to obtain the assists winding are current signal；Control module, for according to the current signal, controlling the switch of the Switching Power Supply.
- 10. device according to claim 9, it is characterised in that also include：Filtration module, for being filtered to the current signal after conversion, obtain the filtered current signal.
- 11. device according to claim 10, it is characterised in that also include：Rectification module, for carrying out rectification to the current signal after conversion, obtain the current signal after rectification.
- 12. the device according to any one of claim 9 to 11, it is characterised in that the control module includes：Obtaining unit, for according to the current signal, and predetermined current reference value, obtaining for controlling the Switching Power Supply The drive signal of driving；Control unit, for the drive signal according to acquisition, drive the opening and closing of the Switching Power Supply.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610767357.1A CN107785874B (en) | 2016-08-30 | 2016-08-30 | Power supply protection method, device and circuit |
| PCT/CN2017/093893 WO2018040789A1 (en) | 2016-08-30 | 2017-07-21 | Power supply protection circuit, method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610767357.1A CN107785874B (en) | 2016-08-30 | 2016-08-30 | Power supply protection method, device and circuit |
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| CN107785874A true CN107785874A (en) | 2018-03-09 |
| CN107785874B CN107785874B (en) | 2022-05-10 |
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| CN109004620A (en) * | 2018-09-07 | 2018-12-14 | 奥克斯空调股份有限公司 | A kind of IGBT current foldback circuit and air conditioner |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018040789A1 (en) | 2018-03-08 |
| CN107785874B (en) | 2022-05-10 |
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