CN109390917A - Control method, device and the DCDC power protecting circuit of DCDC power supply - Google Patents
Control method, device and the DCDC power protecting circuit of DCDC power supply Download PDFInfo
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- CN109390917A CN109390917A CN201811556920.6A CN201811556920A CN109390917A CN 109390917 A CN109390917 A CN 109390917A CN 201811556920 A CN201811556920 A CN 201811556920A CN 109390917 A CN109390917 A CN 109390917A
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- pressure side
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- circuit
- isolation type
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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
- H02H7/1213—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 DC-DC converters
-
- 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
- H02H3/08—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 current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the present application provides control method, device and the DCDC power protecting circuit of a kind of DCDC power supply.Non-isolation type DCDC power protecting circuit includes non-isolation type DCDC translation circuit and power-supply controller of electric；The input terminal of power-supply controller of electric is electrically connected with the port of at least side in the low pressure side and high pressure side in non-isolation type DCDC translation circuit, and the port voltage of low-pressure side is lower than the port voltage of high-voltage end；The output end of power-supply controller of electric is electrically connected with the switch unit in non-isolation type DCDC translation circuit.The embodiment of the present application can promote fault detection speed, while promote the response speed to failure, and then promote the short-circuit protection speed to non-isolation type DCDC translation circuit, be applicable to the short-circuit protection to powerful non-isolation type bidirectional DC/DC translation circuit.
Description
Technical field
This application involves DCDC power technique fields, specifically, this application involves a kind of non-isolation type DCDC power supplys
Control method, device and non-isolation type DCDC power protecting circuit.
Background technique
The protection problem of high-power DC/DC (Direct Current-Direct Current, DC-DC) translation circuit
It always is the difficult point of power electronics, especially non-isolated high-power DC/DC translation circuit.
Existing market mainly has fastp-acting fuse mode, direct current for the current protection of non-isolation type DCDC translation circuit
The guard methods such as breaker mode, DC solid circuit breaker mode, specifically, usually in non-isolation type DCDC translation circuit
High-pressure side increases fastp-acting fuse or breaker.
However the response speed of above two device is slower, from short trouble occur to disconnecting circuit need several milliseconds even
It is the response time of a few tens of milliseconds, the longer response time can make short circuit current considerably beyond the ability to bear of circuit devcie, from
And cause device failure；And above-mentioned several short-circuit protection modes are only applicable to low-power circuit, can not carry out to high-power circuit
It is effectively protected.
Summary of the invention
The application is directed to the shortcomings that existing way, proposes that control method, device and the DCDC power supply of a kind of DCDC power supply are protected
Protection circuit, it is relatively slow and can not be to big to solve the protection speed of the existing technology to non-isolation type DCDC translation circuit
The technical issues of power circuit is protected.
In a first aspect, the embodiment of the present application provides a kind of non-isolation type DCDC power protecting circuit, including non-isolation type
DCDC translation circuit and power-supply controller of electric；
At least side in low pressure side and high pressure side in the input terminal of power-supply controller of electric and non-isolation type DCDC translation circuit
Port electrical connection, the port voltage of low-pressure side is lower than the port voltage of high-voltage end；
The output end of power-supply controller of electric is electrically connected with the switch unit in non-isolation type DCDC translation circuit；
Power-supply controller of electric is used for: being obtained the port voltage of at least side in low pressure side and high pressure side, is sentenced according to port voltage
Whether disconnected low-pressure side or high-pressure side are short-circuit, export shutdown control letter to switch unit when determining low-pressure side or high-pressure side short circuit
Number, so that switch unit turns off.
Second aspect, the embodiment of the present application provide a kind of control method of non-isolation type DCDC power supply, comprising:
Obtain the port voltage of at least side in the low pressure side and high pressure side in non-isolation type DCDC translation circuit；Low-pressure side
Port voltage be lower than on high-tension side port voltage；
Judge whether low-pressure side or high-pressure side are short-circuit according to port voltage；
When determining low-pressure side or high-pressure side short circuit, the switch unit into non-isolation type DCDC translation circuit exports shutdown
Signal is controlled, switch unit is turned off.
The third aspect, the embodiment of the present application provide a kind of control device of non-isolation type DCDC power supply, comprising:
Signal acquisition module, for obtaining in the low pressure side and high pressure side in non-isolation type DCDC translation circuit at least side
Port voltage；The port voltage of low-pressure side is lower than on high-tension side port voltage；
Signal analysis module, for judging whether low-pressure side or high-pressure side are short-circuit according to port voltage；
Signal output module, for when determining low-pressure side or high-pressure side short circuit, into non-isolation type DCDC translation circuit
Switch unit output shutdown control signal, turn off switch unit.
Fourth aspect, the embodiment of the present application provide a kind of computer readable storage medium, are stored with computer program, should
The control for the non-isolation type DCDC power supply that the embodiment of the present application second aspect provides is realized when computer program is executed by processor
Method.
Technical solution provided by the embodiments of the present application, at least has the following beneficial effects:
The embodiment of the present application is realized by the port voltage of detection high-pressure side or low-pressure side to high-pressure side or low-pressure side
Short-circuit protection can promote fault detection speed, while promote the response speed to failure, and then promoted and become to non-isolation type DCDC
The short-circuit protection speed for changing circuit is applicable to the short-circuit protection to powerful non-isolation type bidirectional DC/DC translation circuit.
The additional aspect of the application and advantage will be set forth in part in the description, these will become from the following description
It obtains obviously, or recognized by the practice of the application.
Detailed description of the invention
The application is above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is a kind of structural framing schematic diagram of non-isolation type DCDC power protecting circuit provided by the embodiments of the present application；
Fig. 2 is a kind of electrical block diagram of non-isolation type DCDC power protecting circuit provided by the embodiments of the present application；
Fig. 3 is that another circuit structure of non-isolation type DCDC power protecting circuit provided by the embodiments of the present application is illustrated
Figure；
Fig. 4 is that another circuit structure of non-isolation type DCDC power protecting circuit provided by the embodiments of the present application is illustrated
Figure；
Fig. 5 is a kind of control method flow diagram of non-isolation type DCDC power supply provided by the embodiments of the present application；
Fig. 6 is a kind of structural framing signal of control device of non-isolation type DCDC power supply provided by the embodiments of the present application
Figure.
Specific embodiment
The application is described below in detail, the example of the embodiment of the present application is shown in the accompanying drawings, wherein it is identical from beginning to end or
Similar label indicates same or similar component or component with the same or similar functions.In addition, if known technology
Detailed description is characterized in the application shown unnecessary, then omits it.Below with reference to the reality of attached drawing description
It applies example to be exemplary, is only used for explaining the application, and the limitation to the application cannot be construed to.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in the application fields.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in the description of the present application
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes one or more associated wholes for listing item or any cell and all combinations.
First to this application involves several nouns be introduced and explain:
Non-isolation type bidirectional DC/DC: there is no electrical isolation, with boost and decompression dual function a kind of direct current
Source translation circuit.
Buck (decompression) operating mode: bidirectional DC/DC translation circuit is a kind of operating mode of low-voltage high voltage drop.
Boost (boosting) operating mode: bidirectional DC/DC translation circuit is upgraded to low-voltage a kind of operating mode of high voltage.
Discovery when present inventor studies, for bidirectional DC/DC translation circuit, current conventional short-circuit protection
Mode is the method using detection electric current to determine whether there is short trouble, due to having electricity in current loop under this mode
Sense, when can hinder the rising of electric current, therefore short trouble occur, short circuit current upper immediately will not be grown, to make fault detection
Speed is lower, and then also longer to the response time of failure, influences the speed of whole short-circuit protection.
In addition, also found when present inventor studies, when DCDC converts electricity in existing DCDC power supply product
The high-pressure side on road port voltage when there is short trouble can be greatly reduced, lower than the port voltage of low-pressure side, at this time electric current meeting
It from low-pressure side process high-pressure side to power to high-pressure side, and can constantly increase in the power supply process short circuit currents, be more than each
The ability to bear of circuit devcie to damage, therefore cannot achieve in existing DCDC power supply product on high-tension side short
Road protection.
Control method, device and the non-isolation type DCDC power protection electricity of non-isolation type DCDC power supply provided by the present application
Road, it is intended to solve the technical problem as above of the prior art.
How the technical solution of the application and the technical solution of the application are solved with specifically embodiment below above-mentioned
Technical problem is described in detail.These specific embodiments can be combined with each other below, for the same or similar concept
Or process may repeat no more in certain embodiments.Below in conjunction with attached drawing, embodiments herein is described.
The embodiment of the present application provides a kind of non-isolation type DCDC power protecting circuit, as shown in Figure 1, the non-isolation type
DCDC power protecting circuit 100 includes non-isolation type DCDC translation circuit 101 and power-supply controller of electric 102.
In the input terminal of power-supply controller of electric 102 and the low pressure side and high pressure side in non-isolation type DCDC translation circuit 101 extremely
The port electrical connection of few side, the port voltage of low-pressure side are lower than on high-tension side port voltage；The output end of power-supply controller of electric 102
It is electrically connected with the switch unit in non-isolation type DCDC translation circuit 101.
Power-supply controller of electric 102 is used for: the port voltage of at least side in low pressure side and high pressure side is obtained, according to port electricity
Pressure judges whether low-pressure side or high-pressure side are short-circuit, exports shutdown control to switch unit when determining low-pressure side or high-pressure side short circuit
Signal, so that switch unit turns off.
In an optional embodiment, as shown in Fig. 2, non-isolation type DCDC translation circuit 101 includes: first capacitor
C1, the second capacitor C2, first switch device V1, second switch device V2 and inductance L.
The both ends of first capacitor C1 are electrically connected on high-tension side positive voltage terminal, negative voltage side respectively, and the two of the second capacitor C2
The positive voltage terminal of end difference low-pressure side, negative voltage side electrical connection；The first end of first switch device V1, second end respectively with high pressure
The first end electrical connection of the positive voltage terminal, second switch device V2 of side, the second end of second switch device V2 are born on high-tension side
Voltage end electrical connection；The both ends of inductance L are electrically connected with the positive voltage terminal of the second end of first switch device V2, low-pressure side respectively.
Optionally, first switch device V1 is as switch unit；The input terminal of power-supply controller of electric 102 and the port of low-pressure side
Electrical connection, and the output end of power-supply controller of electric 102 is electrically connected with the control terminal of first switch device V1.
In another optional embodiment, as shown in Figure 3 and Figure 4, non-isolation type DCDC translation circuit 101 includes:
First capacitor C1, the second capacitor C2, first switch device V1, second switch device V2, third switching element T 3, inductance L and
Diode D3.
The both ends of first capacitor C1 are electrically connected on high-tension side positive voltage terminal, negative voltage side respectively；First switch device V1
First end, second end be electrically connected respectively with the first end of on high-tension side positive voltage terminal, second switch device V2, second switch device
The second end of part V2 is electrically connected on high-tension side negative voltage side；The both ends of inductance L respectively with the second end of first switch device V1,
The first end of third switching element T 3 is electrically connected, and the second end of third switching element T 3 is electrically connected with the positive voltage terminal of low-pressure side；
The negative voltage side electrical connection of the first end, low-pressure side of the both ends difference third switching element T 3 of second capacitor C2；Diode D3's
Anode, cathode are electrically connected with the first end of the negative voltage side of low-pressure side, third switching element T 3 respectively.
Optionally, second switch device V2 and third switching element T 3 are used as switch unit；The input of power-supply controller of electric 102
End is electrically connected with the port of at least side in low pressure side and high pressure side, and the output end of power-supply controller of electric 102 and second switch device
The control terminal of part V2 and the control terminal of third switching element T 3 are electrically connected.
Optionally, first switch device V1, second switch device V2 and the third switching element T 3 in the embodiment of the present application
It is full control type power device, such as (Insulated Gate Bipolar Transistor, insulated gate are double for switching device
Bipolar transistor), MOS (Metal Oxide Semiconductor) pipe, (Gate Turn-Off Thyristor, can close GTO
Disconnected thyristor) etc. any one.
Non-isolation type DCDC power protecting circuit 100 provided by the embodiments of the present application is to non-isolation type DCDC translation circuit
101 concrete principles protected can refer to subsequent embodiment of the method, not repeat herein.
Based on the same inventive concept, the embodiment of the present application provides a kind of control method of non-isolation type DCDC power supply, can
Applied to the power-supply controller of electric 102 of non-isolation type DCDC power protecting circuit 100 provided by the embodiments of the present application, as shown in figure 5,
The control method includes:
S501 obtains the port electricity of at least side in the low pressure side and high pressure side in non-isolation type DCDC translation circuit 101
Pressure；The port voltage of low-pressure side is lower than on high-tension side port voltage.
S502 judges whether low-pressure side or high-pressure side are short-circuit according to port voltage.
Optionally, judge port voltage of the port voltage relative to the same side of previous acquisition, if voltage decline occur
And voltage drop-out value is greater than preset voltage falling-threshold value；Determining that voltage decline occurs in port voltage and voltage drop-out value is greater than
When preset voltage falling-threshold value, low-pressure side or high-pressure side short circuit are determined.
Voltage falling-threshold value in the embodiment of the present application can be arranged according to the actual situation, according to the actual situation, for judging
The voltage falling-threshold value of low-pressure side short-circuit conditions and voltage falling-threshold value for judging high-pressure side short-circuit conditions, may be configured as phase
Same numerical value, may be alternatively provided as different numerical value.
S503, the switch unit when determining low-pressure side or high-pressure side short circuit, into non-isolation type DCDC translation circuit 101
Output shutdown control signal, turns off switch unit.
Optionally, electric on high-tension side port into non-isolation type DCDC translation circuit 101 when determining low-pressure side short circuit
First switch device output the first shutdown control signal of connection, turns off first switch device.
Optionally, electric with the port of low-pressure side into non-isolation type DCDC translation circuit 101 when determining high-pressure side short circuit
The second switch device and third switching device of connection export the second shutdown control signal and third shutdown control signal respectively, point
Not turn off second switch device and third switching device.
The control method of above-mentioned non-isolation type DCDC power supply provided by the embodiments of the present application is applicable to non-isolation type DCDC
The Buck operating mode and Boost operating mode of translation circuit 101, separately below shown in Fig. 3 and Fig. 4 for circuit, to this
Apply for control method the answering in Buck operating mode and Boost operating mode for the non-isolation type DCDC power supply that embodiment provides
With being introduced.
As shown in figure 3, the first switch device V1 of non-isolation type DCDC translation circuit 101 exists under Buck operating mode
It works under PWM (Pulse Width Modulation, pulse width modulation) mode, electric current passes through first switch device from high-pressure side
Diode in part V1, inductance L and third switching element T 3 flows to low-pressure side, to low-pressure side load supplying；Power-supply controller of electric 102
The port voltage VP of real-time detection low-pressure side.
End of the port voltage VP for the low-pressure side that the judgement of power-supply controller of electric 102 detects relative to the low-pressure side of previous acquisition
Mouth voltage, if voltage decline occur and voltage drop-out value is greater than preset voltage falling-threshold value；If it is determined that the end of low-pressure side
When mouth voltage VP voltage decline and voltage drop-out value occurs greater than preset voltage falling-threshold value, then it is believed that low-pressure side occurs
Short trouble generates fault-signal, and then according to the fault-signal and pwm signal output the first shutdown control signal Ga1；It should
Ga1 signal makes first switch device V1 no longer work under pwm signal, to cut for controlling first switch device V1 shutdown
Power-off stream, plays the role of low-pressure side short-circuit protection.
Under Buck operating mode, low-pressure side is carried out using non-isolation type DCDC power protecting circuit 100 shown in Fig. 2
The principle of short trouble detection and short-circuit protection is similar to principle shown in Fig. 3, and details are not described herein again.
As shown in figure 4, second switch device V2 works in a PWM mode under Boost operating mode, electric current is from low pressure
Side powers by the freewheeling diode in third switching element T 3, inductance L and first switch device V1 to high-pressure side, power supply process
Middle third switching element T 3 is constantly in opening state；The on high-tension side port voltage VP of 102 real-time detection of power-supply controller of electric, can also
The opening state of real-time detection second switch device V2 and third switching element T 3 obtain open signal.
Power-supply controller of electric 102 judges on high-tension side end of the on high-tension side port voltage VP detected relative to previous acquisition
Mouth voltage, if voltage decline occur and voltage drop-out value is greater than preset voltage falling-threshold value；If it is determined that on high-tension side end
When mouth voltage VP voltage decline and voltage drop-out value occurs greater than preset voltage falling-threshold value, then it is believed that high-pressure side occurs
Short trouble generates fault-signal, and then is switched according to the fault-signal and the second switch device V2 and third that get
Device T is in the open signal of opening state, the second shutdown control signal Ga2 and third shutdown control signal Ga3 is exported, to divide
Not Kong Zhi second switch device V2 and third switching element T 3 turn off, make second switch device V2 and third switching element T 3 no longer
It works under pwm signal, to cut off electric current, plays the role of high-pressure side short-circuit protection.
For the high-pressure side short-circuit protection under Boost operating mode, as previously mentioned, the embodiment of the present application is by third derailing switch
Part T3 is connected to the low-pressure side of non-isolation type DCDC translation circuit 101, is realized by the way of closing third switching element T 3
On high-tension side short-circuit protection, specifically, when short circuit occurs for high-pressure side, short circuit current can be made of following two stages:
First stage is first capacitor C1 discharge regime, and short circuit current is very big at this time, but energy comparison is small, and is not passed through
Device, therefore not will cause device failure.
Second stage be short circuit current flow through inductance L, at this time the rate of rise of short circuit current will receive inductance L influence and
It is slack-off, make third switching element T 3 there is time enough to respond and act, to cut off short circuit current, third can be substantially reduced and opened
The spoilage for closing device T3, plays the protective effect to circuit, and makes protection more safely, effectively.
After third switching element T 3 has cut off short circuit current, induced potential can be generated in inductance L, but due in circuit
The presence of diode D3 provides access for the afterflow of inductance L, and induced potential can be by diode D3 clamper in a very low electricity
Pressure, so that third switching device damages due to will not turning off overvoltage because generating.
Using above-mentioned technical proposal provided by the embodiments of the present application, at least may be implemented it is following the utility model has the advantages that
1) when fault occur in the high-pressure side of non-isolation type DCDC translation circuit or low-pressure side, the change of port voltage
Change fast speed, therefore the embodiment of the present application is realized by the port voltage of detection high-pressure side or low-pressure side to high-pressure side or low
The short-circuit protection for pressing side can promote fault detection speed, while promote the response speed to failure, and then be promoted to non-isolation type
The short-circuit protection speed of DCDC translation circuit；
2) conventional short-circuit protection mode is usually that fastp-acting fuse or breaker is arranged in high-voltage end, in the event of a failure
Disconnecting circuit, however the response speed of fastp-acting fuse and breaker is relatively slow, the response time is longer, from short trouble occur to
Disconnecting circuit usually requires several milliseconds or a few tens of milliseconds, can rise in longer response time internal short-circuit electric current considerably beyond portion
The ability to bear of parallel circuit device can not really play the role of short-circuit protection so that circuit devcie be caused to damage；Relative to upper
Conventional short-circuit protection mode is stated, the embodiment of the present application increases third switching element T 3 in non-isolation type DCDC translation circuit
(such as IGBT) will shorten and (can foreshorten in several microseconds) using the movement rapidity of the third switching element T 3 response time,
Short circuit current is set to be maintained at a lower numerical value in response time, to realize under the premise of not damaging circuit devcie to height
Press the fast short-circuit protective of side；
3) the embodiment of the present application by third switching element T 3 be arranged in non-isolation type DCDC translation circuit low-pressure side rather than
High-pressure side can avoid heavy current impact when high pressure lateral capacitance C1 discharges to third switching element T 3, and then third avoided to switch
Device T3 is damaged because of heavy current impact；
4) the embodiment of the present application increases diode D3 in the low-pressure side of non-isolation type DCDC translation circuit, diode D3's
There are avoidable first switch device T3 to generate shutdown overvoltage when off, and then can avoid third switching element T 3 because of shutdown
Overvoltage and damage；
5) it identifies short trouble usually by way of detecting short circuit current in the prior art and realizes short-circuit protection, and
The inductance in current loop can hinder the rising of electric current in this process, and the rate of climb of short circuit current is slack-off, so as to short circuit
The detection of failure has hysteresis quality, and then can not provide short-circuit protection in time；Above-mentioned fault detection in compared with the prior art
With short-circuit protection mode, the embodiment of the present application is realized by detecting the port voltage of non-isolation type DCDC translation circuit low-pressure side
Short-circuit protection, compared with the prior art in realize that the mode of short-circuit protection, the application are real by way of detecting short circuit current
The characteristics of applying voltage rapid decrease when example utilizes short circuit, after short circuit occurs in low-pressure side, can detect low pressure in a short time
The decline of side ports voltage identifies short trouble on this basis, and detection speed is higher than the mode of detection short circuit current, into
And the response for turning off circuit in time in low-pressure side short circuit is also contributed to, improve whole short-circuit protection speed；
6) the embodiment of the present application is applicable to the short-circuit protection to powerful non-isolation type bidirectional DC/DC translation circuit.
Based on the same inventive concept, the embodiment of the present application provides a kind of control device of non-isolation type DCDC power supply, can
The control method that the non-isolation type DCDC power supply provided in mentioned-above embodiment of the method is provided, as shown in fig. 6, this is non-isolated
The control device 600 of type DCDC power supply includes: signal acquisition module 601, signal analysis module 602 and signal output module
603。
Signal acquisition module 601, for obtaining in the low pressure side and high pressure side in non-isolation type DCDC translation circuit 101 extremely
The port voltage of few side；The port voltage of low-pressure side is lower than on high-tension side port voltage.
Signal analysis module 602, for judging whether low-pressure side or high-pressure side are short-circuit according to voltage signal.
Signal output module 603, for when determining low-pressure side or high-pressure side short circuit, to non-isolation type DCDC translation circuit
Switch unit output shutdown control signal in 101, turns off switch unit.
Optionally, signal analysis module 602 is specifically used for: judging end of the port voltage relative to the same side of previous acquisition
Mouth voltage, if voltage decline occur and voltage drop-out value is greater than preset voltage falling-threshold value；Determining port voltage appearance
When voltage declines and voltage drop-out value is greater than preset voltage falling-threshold value, low-pressure side or high-pressure side short circuit are determined.
Optionally, signal output module 603 is specifically used for: when determining low-pressure side short circuit, converting to non-isolation type DCDC
First switch device output the first shutdown control signal being electrically connected in circuit 101 on high-tension side port, makes first switch device
Part shutdown.
Optionally, signal output module 603 is specifically used for: when determining high-pressure side short circuit, converting to non-isolation type DCDC
The second switch device and third switching device being electrically connected in circuit 101 with the port of low-pressure side export the second shutdown control respectively
Signal and third shutdown control signal, respectively turn off second switch device and third switching device.
The control device 600 of non-isolation type DCDC power supply provided by the embodiments of the present application, with mentioned-above each embodiment
Inventive concept having the same and identical beneficial effect are not shown in detail in the control device 600 of non-isolation type DCDC power supply
Content out can refer to mentioned-above each embodiment, and details are not described herein.
Based on the same inventive concept, the embodiment of the present application provides a kind of computer readable storage medium, is stored thereon with
Computer program, the computer program realize non-isolation type DCDC power supply provided by the embodiment of the present application when being executed by processor
Control method.
The computer-readable medium include but is not limited to any kind of disk (including floppy disk, hard disk, CD, CD-ROM and
Magneto-optic disk), ROM (Read-Only Memory, read-only memory), RAM (deposit by Random Access Memory, arbitrary access
Reservoir), EPROM (Erasable Programmable Read-Only Memory, Erarable Programmable Read only Memory),
(Electrically Erasable Programmable Read Only Memory, electric erazable programmable is read-only to be deposited EEPROM
Reservoir), flash memory, magnetic card or light card.It is, readable medium includes by equipment (for example, computer) can read
Form storage or transmission information any medium.
Computer readable storage medium provided by the embodiments of the present application, with mentioned-above each embodiment hair having the same
Bright design and identical beneficial effect, the content not being shown specifically in the computer readable storage medium can refer to mentioned-above
Each embodiment, details are not described herein.
Those skilled in the art of the present technique have been appreciated that in the application the various operations crossed by discussion, method, in process
Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with what is crossed by discussion in the application
Kind of operation, method, other steps, measures, and schemes in process may also be alternated, changed, rearranged, decomposed, combined or deleted.
Further, in the prior art to have and the step in various operations disclosed herein, method, process, measure, scheme
It may also be alternated, changed, rearranged, decomposed, combined or deleted.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or
It is more than two.
It should be understood that although each step in the flow chart of attached drawing is successively shown according to the instruction of arrow,
These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
Execution there is no stringent sequences to limit, can execute in the other order.Moreover, at least one in the flow chart of attached drawing
Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-steps
Completion is executed, but can be executed at different times, execution sequence, which is also not necessarily, successively to be carried out, but can be with other
At least part of the sub-step or stage of step or other steps executes in turn or alternately.
The above is only some embodiments of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (14)
1. a kind of non-isolation type DCDC power protecting circuit, which is characterized in that including non-isolation type DCDC translation circuit and power supply
Controller；
In low pressure side and high pressure side in the input terminal of the power-supply controller of electric and the non-isolation type DCDC translation circuit at least
The port of side is electrically connected, and the port voltage of the low-pressure side is lower than the on high-tension side port voltage；
The output end of the power-supply controller of electric is electrically connected with the switch unit in the non-isolation type DCDC translation circuit；
The power-supply controller of electric is used for: at least port voltage of side is obtained in the low-pressure side and the high-pressure side, according to institute
It states port voltage and judges whether the low-pressure side or the high-pressure side are short-circuit, determining the low-pressure side or high-pressure side short circuit
When to the switch unit export shutdown control signal so that the switch unit turn off.
2. non-isolation type DCDC power protecting circuit according to claim 1, which is characterized in that the non-isolation type DCDC
Translation circuit includes: first capacitor, the second capacitor, first switch device, second switch device and inductance；
The both ends of the first capacitor are electrically connected with the on high-tension side positive voltage terminal, negative voltage side respectively, second capacitor
Both ends distinguish the positive voltage terminal of the low-pressure side, negative voltage side electrical connection；
The first end of the first switch device, second end respectively with the on high-tension side positive voltage terminal, the second switch device
The first end of part is electrically connected, and the second end of the second switch device is electrically connected with the on high-tension side negative voltage side；
The both ends of the inductance are electrically connected with the positive voltage terminal of the second end of the first switch device, the low-pressure side respectively.
3. non-isolation type DCDC power protecting circuit according to claim 2, which is characterized in that the first switch device
As the switch unit；
The input terminal of the power-supply controller of electric is electrically connected with the port of the low-pressure side, and the output end of the power-supply controller of electric with
The control terminal of the first switch device is electrically connected.
4. non-isolation type DCDC power protecting circuit according to claim 1, which is characterized in that the non-isolation type DCDC
Translation circuit include: first capacitor, the second capacitor, first switch device, second switch device, third switching device, inductance with
And diode；
The both ends of the first capacitor are electrically connected with the on high-tension side positive voltage terminal, negative voltage side respectively；
The first end of the first switch device, second end respectively with the on high-tension side positive voltage terminal, the second switch device
The first end of part is electrically connected, and the second end of the second switch device is electrically connected with the on high-tension side negative voltage side；
First end of the both ends of the inductance respectively with the second end of the first switch device, the third switching device is electrically connected
It connects, the second end of the third switching device is electrically connected with the positive voltage terminal of the low-pressure side；
The first end of the third switching device, the negative voltage side of the low-pressure side are electrically connected respectively at the both ends of second capacitor
It connects；
The anode of the diode, the cathode first end with the negative voltage side of the low-pressure side, the third switching device respectively
Electrical connection.
5. non-isolation type DCDC power protecting circuit according to claim 4, which is characterized in that the second switch device
With the third switching device as the switch unit；
The input terminal of the power-supply controller of electric is electrically connected with the port of at least side in the low-pressure side and the high-pressure side, and institute
The control terminal for stating the output end of power-supply controller of electric and the control terminal of the second switch device and the third switching device is distinguished
Electrical connection.
6. a kind of control method of non-isolation type DCDC power supply characterized by comprising
Obtain the port voltage of at least side in the low pressure side and high pressure side in non-isolation type DCDC translation circuit；The low-pressure side
Port voltage be lower than the on high-tension side port voltage；
Judge whether the low-pressure side or the high-pressure side are short-circuit according to the port voltage；
Switch unit when determining the low-pressure side or the high-pressure side short circuit, in Xiang Suoshu non-isolation type DCDC translation circuit
Output shutdown control signal, turns off the switch unit.
7. control method according to claim 6, which is characterized in that described to judge the low pressure according to the voltage signal
Whether side or the high-pressure side are short-circuit, comprising:
Judge port voltage of the port voltage relative to the same side of previous acquisition, if occur under voltage decline and voltage
Depreciation is greater than preset voltage falling-threshold value；
Determining that voltage decline occurs in the port voltage and the voltage drop-out value is greater than the preset voltage falling-threshold value
When, determine the low-pressure side or high-pressure side short circuit.
8. control method according to claim 6, which is characterized in that described to determine the low-pressure side or the high-pressure side
When short-circuit, the switch unit output shutdown in Xiang Suoshu non-isolation type DCDC translation circuit controls signal, makes the switch unit
Shutdown, comprising:
When determining the low-pressure side short circuit, it is electrically connected in Xiang Suoshu non-isolation type DCDC translation circuit with the on high-tension side port
First switch device output the first shutdown control signal connect, turns off the first switch device.
9. control method according to claim 6, which is characterized in that described to determine the low-pressure side or the high-pressure side
When short-circuit, the switch unit output shutdown in Xiang Suoshu non-isolation type DCDC translation circuit controls signal, makes the switch unit
Shutdown, comprising:
When determining the high-pressure side short circuit, it is electrically connected in Xiang Suoshu non-isolation type DCDC translation circuit with the port of the low-pressure side
The second switch device and third switching device connect exports the second shutdown control signal and third shutdown control signal respectively, respectively
Turn off the second switch device and the third switching device.
10. a kind of control device of non-isolation type DCDC power supply characterized by comprising
Signal acquisition module, for obtaining in the low pressure side and high pressure side in non-isolation type DCDC translation circuit at least end of side
Mouth voltage；The port voltage of the low-pressure side is lower than the on high-tension side port voltage；
Signal analysis module, for judging whether the low-pressure side or the high-pressure side are short-circuit according to the port voltage；
Signal output module, for when determining the low-pressure side or the high-pressure side short circuit, Xiang Suoshu non-isolation type DCDC to become
The switch unit output shutdown control signal in circuit is changed, the switch unit is turned off.
11. control device according to claim 10, which is characterized in that
The signal analysis module is specifically used for: judging the port electricity of the same side of the port voltage relative to previous acquisition
Pressure, if voltage decline occur and voltage drop-out value is greater than preset voltage falling-threshold value；Determining the port voltage appearance
When voltage declines and the voltage drop-out value is greater than the preset voltage falling-threshold value, the low-pressure side or the high pressure are determined
Side short circuit.
12. control device according to claim 10, which is characterized in that
The signal output module is specifically used for: when determining the low-pressure side short circuit, Xiang Suoshu non-isolation type DCDC transformation electricity
First switch device output the first shutdown control signal of on high-tension side port electrical connection described in Lu Zhongyu, makes the first switch
Device shutdown.
13. control device according to claim 10, which is characterized in that
The signal output module is specifically used for: when determining the high-pressure side short circuit, Xiang Suoshu non-isolation type DCDC transformation electricity
The second switch device and third switching device of the port electrical connection of low-pressure side described in Lu Zhongyu export the second shutdown control respectively
Signal and third shutdown control signal, respectively turn off the second switch device and the third switching device.
14. a kind of computer readable storage medium, which is characterized in that be stored with computer program, the computer program is located
Manage the control method that non-isolation type DCDC power supply described in any one of claim 6 to 9 is realized when device executes.
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|---|---|---|---|
| CN201811556920.6A CN109390917B (en) | 2018-12-19 | 2018-12-19 | Control method and device of DCDC power supply and DCDC power supply protection circuit |
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| CN201811556920.6A CN109390917B (en) | 2018-12-19 | 2018-12-19 | Control method and device of DCDC power supply and DCDC power supply protection circuit |
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| CN109390917B (en) | 2021-06-25 |
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