CN109639110A - A kind of booster circuit and charger - Google Patents
A kind of booster circuit and charger Download PDFInfo
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- CN109639110A CN109639110A CN201811562805.XA CN201811562805A CN109639110A CN 109639110 A CN109639110 A CN 109639110A CN 201811562805 A CN201811562805 A CN 201811562805A CN 109639110 A CN109639110 A CN 109639110A
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- 230000004224 protection Effects 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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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
- H02M1/00—Details of apparatus for conversion
-
- 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
-
- H02J7/0026—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H02J7/0072—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of booster circuit, including high voltage step-up unit and switch unit；The switch unit is connected with the high voltage step-up unit, wherein the first signal output end of the control terminal connection high voltage step-up unit of the switch unit；When the output voltage that the high voltage step-up unit judges go out its output end is less than threshold voltage, the first signal of output；Itself is turned off after the control terminal of the switch unit receives the first signal, guarantees the connection cutting between the high voltage step-up unit and load circuit.When a kind of booster circuit disclosed by the invention solves load circuit short circuit by increasing switch unit, the problem of high voltage step-up unit is burned, allow a kind of booster circuit disclosed in the present embodiment when short circuit occurs in load circuit, automatically powers off, increase the safety of the booster circuit；Also, since a kind of boost circuit structure disclosed by the invention is simple, institute is in order to being widely applied.
Description
Technical field
The present invention relates to circuit protection technical field more particularly to a kind of booster circuits and charger.
Background technique
In recent years, electronic product continues to develop, and in order to meet people's prolonged use demand, the battery of electronic product holds
Amount continues to increase, but accompanying problem is that, the time of charging is increasingly longer.It is desirable in the nondecreasing feelings of battery capacity
Under condition, the time of charging is reduced, to obtain more ultimate attainment usage experience.
It therefore, can only be fast by promoting the charging of electronic product under the premise of not reducing the battery capacity of electronic product
Rate reduces the charging time.The method for promoting charge rate can also be filled by increasing electric current when charging by increasing
Voltage when electric.But the more products of existing market are using second method.It can be deduced from the performance in market, it is modern
High voltage step-up product can be used widely afterwards.
But current high voltage step-up product the problem of there are still circuit protections.When short circuit occurs in load circuit, although built-in
Short-circuit observation circuit, but cannot be by high voltage step-up powering down chips, to easily cause burning out for high voltage step-up chip.
Summary of the invention
In view of this, the present invention provides in order to solve the problem of that high voltage step-up unit is burned when load circuit short circuit
A kind of booster circuit.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
First aspect present invention provides a kind of booster circuit, comprising:
High voltage step-up unit, for when judge the high voltage step-up unit output voltage be less than threshold voltage when, it is defeated
First signal out；
The control terminal of the switch unit being connected with the high voltage step-up unit, the switch unit connects the high voltage step-up
The output end of first signal of unit；Wherein, the switch unit is used for when receiving the first signal, and it is single to turn off the switch
Member cuts off the connection between the high voltage step-up unit and load circuit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit connects the output end of the high voltage step-up unit, the output end of the switch unit
Connect the input terminal of load circuit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit connects the output end of the load circuit, the output end connection of the switch unit
The protection ground terminal of the high voltage step-up unit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit by inductance access input voltage, the switch unit output end connection described in
The switch control terminal of high voltage step-up unit.
Optionally, the switch unit, comprising: the N-type Metal-oxide-semicondutor field effect transistor of low conduction impedance
The p-type metal-oxide semiconductor fieldeffect transistor PMOS tube of pipe NMOS tube or low conduction impedance.
Optionally, the high voltage step-up unit, comprising:
First power tube of output end ground connection；
Output end connects the second power tube of the input terminal of first power tube, and the input terminal of second power tube connects
The output end of the high voltage step-up unit is connect, second power tube connect the high pressure with the common end of first power tube
The switch control terminal of boosting unit；
The input terminal of short-circuit observation circuit, the short circuit observation circuit connects the output end of the high voltage step-up unit, institute
The input terminal of the first output end connection control circuit of short-circuit observation circuit is stated, the second output terminal of the short circuit observation circuit connects
Connect the first signal output end of the high voltage step-up unit；The short circuit observation circuit is for monitoring the high voltage step-up unit
Output voltage issues control signal and first signal when the output voltage is less than preset threshold voltage.
The control circuit that output end is connected with the input terminal of driving circuit receives the control signal for working as
When, issue cut-off signals；
First output end connects the driving circuit of the control terminal of the first power tube, the second output of the driving circuit
The control terminal of the second power tube of end connection；The driving circuit is used for when receiving the cut-off signals, shutdown described first
Power tube and the second power tube.
Optionally, first power tube, comprising: NMOS tube or PMOS tube.
Optionally, second power tube, comprising: high voltage PMOS pipe or high pressure NMOS pipe.
Second aspect of the present invention provides a kind of charger, comprising: the liter as described in any one provided such as first aspect
Volt circuit.
In terms of existing technologies, the present invention works as high pressure by increasing the switch unit being connected with high voltage step-up unit
When boosting unit judges that the voltage of itself output is less than threshold voltage, the first signal is issued to switch unit, switch unit connects
Itself is turned off after receiving the first signal, cuts off the connection between the high voltage step-up unit and load circuit, is avoided because negative
It carries short circuit and causes burning out for high voltage step-up unit.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of schematic diagram of the application for booster circuit that the prior art provides；
Fig. 2 is a kind of rough schematic view of the application for booster circuit that the prior art provides；
Fig. 3 is a kind of schematic diagram of the application of booster circuit disclosed by the embodiments of the present invention；
Fig. 4 is a kind of schematic diagram of the application of booster circuit disclosed in another embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of the application of booster circuit disclosed in another embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of the application of booster circuit disclosed in another embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
A kind of booster circuit is provided in the prior art, and physical circuit is as shown in Figure 1, in order to be better described, in Fig. 1
Load circuit is connected to the both ends of booster circuit.
Referring to Fig. 1, in entire circuit, short circuit occurs for load circuit 120, leads to the output electricity of high voltage step-up unit 110
Pressure drop is low.But, high voltage step-up unit 110 comes with short-circuit observation circuit 111, can monitor the defeated of high voltage step-up unit 110
Voltage out, when the output voltage of high voltage step-up unit 110 is less than threshold voltage, the short-circuit output of observation circuit 111 control signal.
After control circuit 112 receives control signal, cut-off signals are exported；Driving circuit is after receiving cut-off signals, by first
Power tube M1 and the second power tube M2 is disconnected.
But due to high voltage step-up unit 110 need it is high pressure resistant, so the second power tube M2 in high voltage step-up unit 110 can
Using High Voltage NMOS field effect transistor (N-Metal-Oxide-Semiconductor,
NMOS), alternatively, using high-voltage P-type metal-Oxide-Semiconductor Field effect transistor (P-Metal-Oxide-
Semiconductor, PMOS), either NMOS tube or PMOS tube, as long as high-voltage tube, due to technique, substrate and
Source electrode is shorted always, be equal between the drain and source series connection one diode D, and the direction of diode D be always from
The switch control terminal SW of high voltage step-up unit 110 is directed toward the output end VOUT of high voltage step-up unit 110.
It then, can be by entire circuit reduction, as shown in Figure 2.When there is short circuit in load, the first power tube M1 and the second function
Rate pipe M2 shutdown, but after the first power tube M1 and the second power tube M2 shutdown, high voltage step-up unit 110 is yet by diode D
Access is formed with load circuit, i.e. the current loop of inductance L is still connected, and the electric current on inductance L still will increase, and eventually lead to
High voltage step-up unit 110 is burnt out.
In order to solve the problem of that high voltage step-up unit is burned when load circuit short circuit, the embodiment of the present invention discloses one
Load circuit is connect, physical circuit by kind booster circuit in order to be better described with booster circuit disclosed by the embodiments of the present invention
Structure can be found in Fig. 3: booster circuit disclosed in the present embodiment, comprising: high voltage step-up unit 310 and switch unit M3；Wherein:
One end of the switch control terminal SW connection inductance L of high voltage step-up unit 310；The input terminal of high voltage step-up unit 310
The other end of VIN connection inductance L；Input voltage is accessed in the common end of the input terminal VIN and inductance L of high voltage step-up unit 310；It is high
The input terminal of the output end VOUT connection load circuit 320 of boosting unit 310 is pressed, and the output end connection of load circuit 320 is opened
Close the input terminal of unit M3.
It should be noted that the enable end EN of high voltage step-up unit 310 is when receiving high level signal, high voltage step-up list
Member 310 is started to work.High voltage step-up unit 310 is during the work time, when judging that its output voltage is less than threshold voltage, then defeated
First signal out.
The protection ground terminal PGND of the output end connection high voltage step-up unit 310 of switch unit M3；The output of switch unit M3
The common end grounding at end and the protection ground terminal PGND of high voltage step-up unit 310；The control terminal of switch unit M3 connects high voltage step-up
First signal output end Vp of unit 310.
It should be noted that switch unit M3 can select the NMOS tube of low conduction impedance or the PMOS of low conduction impedance
Pipe.
Wherein, the control terminal of switch unit M3 turns off certainly after the first signal for receiving the output of high voltage step-up unit 310
Body.Switch unit shutdown, the connection between high voltage step-up unit and load circuit are also just cut off.
In the present embodiment, in the course of work of high voltage step-up unit 310, high voltage step-up unit 310 can constantly detect it
The output voltage of output end VOUT, if short circuit occurs in load circuit 320, high voltage step-up unit 310 judges out its output end
The output voltage of VOUT is less than threshold voltage, then exports the first signal；Also, the control terminal of switch unit M3, receives first
Itself is turned off after signal, it is ensured that the access between cutoff high boosting unit 310 and load circuit 320 is avoided because being negative
Carrying short circuit causes electric current excessive, burns high voltage step-up unit 310.
When the present embodiment solves load circuit short circuit by increasing switch unit, what high voltage step-up unit was burned is asked
Topic allows a kind of booster circuit disclosed in the present embodiment when short circuit occurs in load circuit, automatically powers off, increases the present embodiment
A kind of safety of disclosed booster circuit；Also, a kind of boost circuit structure disclosed in the present embodiment is simple, convenient for answering extensively
With.
Optionally, such as Fig. 4, in another embodiment of the invention, switch unit M3 and high voltage step-up in booster circuit
The another embodiment of the connection relationship of unit 310, comprising:
First signal output end Vp of the control terminal connection high voltage step-up unit 310 of switch unit M3, switch unit M3's
Input terminal connects the output end VOUT of high voltage step-up unit 310, the input of the output end connection load circuit 320 of switch unit M3
End.
Wherein, when high voltage step-up unit 310 is for judging that its output voltage is less than threshold voltage, the first signal is exported；
Switch unit M3 is used to turn off itself after the first signal for receiving the output of high voltage step-up unit 310 in its control terminal, makes height
The connection between boosting unit and load circuit is pressed to cut off.
In the present embodiment, in the course of work of high voltage step-up unit 310, high voltage step-up unit 310 can constantly detect it
The output voltage of output end VOUT.If short circuit occurs in load circuit 320, high voltage step-up unit 310 judges out its output end
The output voltage of VOUT is less than threshold voltage, then exports the first signal.Also, the control terminal of switch unit M3, receives first
Itself is turned off after signal, the output end VOUT of cutoff high boosting unit 310 and the connection branch of load circuit 320, Jin Erke
To guarantee the access between cutoff high boosting unit 310 and load circuit 320, avoid because 320 short circuit of load circuit causes
Electric current is excessive, burns high voltage step-up unit 310.
When the present embodiment solves load circuit short circuit by increasing switch unit, what high voltage step-up unit was burned is asked
Topic allows a kind of booster circuit disclosed in the present embodiment when short circuit occurs in load circuit, automatically powers off, increases the present embodiment
A kind of safety of disclosed booster circuit；Also, a kind of boost circuit structure disclosed in the present embodiment is simple, convenient for answering extensively
With.
Optionally, such as Fig. 5, in another embodiment of the invention, switch unit M3 and high voltage step-up in booster circuit
The another embodiment of the connection relationship of unit 310, comprising:
First signal output end Vp of the control terminal connection high voltage step-up unit 310 of switch unit M3, switch unit M3's
Input terminal accesses input voltage, the switch control terminal of the output end connection high voltage step-up unit 310 of switch unit M3 by inductance L
SW。
Wherein, when high voltage step-up unit 310 is for judging that its output voltage is less than threshold voltage, the first signal is exported；
Switch unit M3 is used to turn off itself after the first signal for receiving the output of high voltage step-up unit 310 in its control terminal, makes height
The connection between boosting unit and load circuit is pressed to cut off.
In the present embodiment, in the course of work of high voltage step-up unit 310, high voltage step-up unit 310 can constantly detect it
The output voltage of output end VOUT.If short circuit occurs in load circuit 320, high voltage step-up unit 310 judges out its output end
The output voltage of VOUT is less than threshold voltage, then exports the first signal.Also, the control terminal of switch unit M3, receives first
Itself is turned off after signal, cuts off the connection branch between the inductance L and switch control terminal SW of high voltage step-up unit 310, Jin Ershi
Existing high voltage step-up unit 310 is powered off with load circuit 320, avoids burning height because 320 short circuit of load circuit causes electric current excessive
Press boosting unit 310.
When the present embodiment solves load circuit short circuit by increasing switch unit, what high voltage step-up unit was burned is asked
Topic allows a kind of booster circuit disclosed in the present embodiment when short circuit occurs in load circuit, automatically powers off, increases the present embodiment
A kind of safety of disclosed booster circuit；Also, a kind of boost circuit structure disclosed in the present embodiment is simple, convenient for answering extensively
With.
Optionally, such as Fig. 6, in another embodiment of the invention, a kind of embodiment of high voltage step-up unit 310 is wrapped
It includes:
Short-circuit observation circuit 311, control circuit 312, driving circuit 313 and the first power tube M1 and the second power tube
M2。
The input terminal of first power tube M1 connects the output end of the second power tube M2, the output termination of the first power tube M1
Ground；The output end VOUT, the second power tube M2 and the first power of the input terminal connection high voltage step-up unit 310 of second power tube M2
The switch control terminal SW of the common end connection high voltage step-up unit 310 of pipe M1.
The output end VOUT of the input terminal connection high voltage step-up unit 310 of short-circuit observation circuit 311, short-circuit observation circuit
The input terminal of 311 the first output end connection control circuit 312, the second output terminal of short-circuit observation circuit 311 connect high pressure liter
Press the first signal output end Vp of unit 310.
The output end of the input terminal connection control circuit 312 of driving circuit 313, the first output end of driving circuit 313 connect
The control terminal of the first power tube M1 is connect, the second output terminal of driving circuit 313 connects the control terminal of the second power tube M2.
It should be noted that the first power tube M1 can select NMOS tube or PMOS tube.
It should be noted that the second power tube M2 can select high voltage PMOS pipe or high pressure NMOS pipe.
In the course of work of the present embodiment high voltage step-up unit 310, short-circuit observation circuit 311 constantly monitors high pressure liter
Press the output voltage of 310 output end VOUT of unit；If short circuit occurs for load circuit 320, short-circuit observation circuit 311 judges height
It presses the output voltage of 310 output end VOUT of boosting unit to be less than threshold voltage, then exports control signal and the first signal.
After control circuit 312 receives control signal, cut-off signals are exported to driving circuit 313；When driving circuit 313
After receiving cut-off signals, the first power tube M1 and the second power tube M2 is turned off；Meanwhile the control terminal of switch unit M3 receives
Itself is turned off after to the first signal；It can guarantee the access between cutoff high boosting unit 310 and load circuit 320 in this way,
It avoids burning high voltage step-up unit 310 because 320 short circuit of load circuit causes electric current excessive.
When the present embodiment solves load circuit short circuit by increasing switch unit, what high voltage step-up unit was burned is asked
Topic allows a kind of booster circuit disclosed in the present embodiment when short circuit occurs in load circuit, automatically powers off, increases the present embodiment
A kind of safety of disclosed booster circuit；Also, a kind of boost circuit structure disclosed in the present embodiment is simple, convenient for answering extensively
With.
The embodiment of the present invention provides a kind of charger, is suitable for electronic product, including booster circuit；The charger passes through
Voltage when increasing charging provides higher charge power for electronic product.And the charger improves charging voltage, is to pass through
What the booster circuit for itself including was realized.The high voltage step-up unit that the booster circuit includes by itself converts input voltage
For higher voltage, to meet the output needs of the charger.Meanwhile the switch unit that the booster circuit includes can be kept away
Exempt from the problem of charger is burned because of load short circuits, improves safety when charger charging.
The booster circuit, comprising:
High voltage step-up unit, for when judge the high voltage step-up unit output voltage be less than threshold voltage when, it is defeated
First signal out；
The control terminal of the switch unit being connected with the high voltage step-up unit, the switch unit connects the high voltage step-up
The output end of first signal of unit；Wherein, the switch unit is used for when receiving the first signal, and it is single to turn off the switch
Member cuts off the connection between the high voltage step-up unit and load circuit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit connects the output end of the high voltage step-up unit, the output end of the switch unit
Connect the input terminal of load circuit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit connects the output end of the load circuit, the output end connection of the switch unit
The protection ground terminal of the high voltage step-up unit.
Optionally, the switch unit is connected with the high voltage step-up unit, comprising:
The input terminal of the switch unit by inductance access input voltage, the switch unit output end connection described in
The switch control terminal of high voltage step-up unit.
Optionally, the switch unit, comprising: the N-type Metal-oxide-semicondutor field effect transistor of low conduction impedance
The p-type metal-oxide semiconductor fieldeffect transistor PMOS tube of pipe NMOS tube or low conduction impedance.
Optionally, the high voltage step-up unit, comprising:
First power tube of output end ground connection；
Output end connects the second power tube of the input terminal of first power tube, and the input terminal of second power tube connects
The output end of the high voltage step-up unit is connect, second power tube connect the high pressure with the common end of first power tube
The switch control terminal of boosting unit；
The input terminal of short-circuit observation circuit, the short circuit observation circuit connects the output end of the high voltage step-up unit, institute
The input terminal of the first output end connection control circuit of short-circuit observation circuit is stated, the second output terminal of the short circuit observation circuit connects
Connect the first signal output end of the high voltage step-up unit；The short circuit observation circuit is for monitoring the high voltage step-up unit
Output voltage issues control signal and first signal when the output voltage is less than preset threshold voltage.
The control circuit that output end is connected with the input terminal of driving circuit receives the control signal for working as
When, issue cut-off signals；
First output end connects the driving circuit of the control terminal of the first power tube, the second output of the driving circuit
The control terminal of the second power tube of end connection；The driving circuit is used for when receiving the cut-off signals, shutdown described first
Power tube and the second power tube.
Optionally, first power tube, comprising: NMOS tube or PMOS tube.
Optionally, second power tube, comprising: high voltage PMOS pipe or high pressure NMOS pipe.
The booster circuit course of work is same as the previously described embodiments, reference can be made to above-described embodiment, just repeats no more here.
The above-mentioned booster circuit of charger utilizing disclosed in the present embodiment, only electronic equipment does not provide bigger output work
Rate shortens the charging time；Also, it also avoids the problem that itself, because load short circuits are burned, improving the safety of charging.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (9)
1. a kind of booster circuit characterized by comprising
High voltage step-up unit, for when the output voltage for judging the high voltage step-up unit is less than threshold voltage, output the
One signal；
The control terminal of the switch unit being connected with the high voltage step-up unit, the switch unit connects the high voltage step-up unit
The first signal output end；Wherein, the switch unit is used for when receiving the first signal, turns off the switch unit,
Cut off the connection between the high voltage step-up unit and load circuit.
2. booster circuit according to claim 1, which is characterized in that the switch unit and the high voltage step-up unit phase
Even, comprising:
The input terminal of the switch unit connects the output end of the high voltage step-up unit, the output end connection of the switch unit
The input terminal of load circuit.
3. booster circuit according to claim 1, which is characterized in that the switch unit and the high voltage step-up unit phase
Even, comprising:
The input terminal of the switch unit connects the output end of the load circuit, described in the output end connection of the switch unit
The protection ground terminal of high voltage step-up unit.
4. booster circuit according to claim 1, which is characterized in that the switch unit and the high voltage step-up unit phase
Even, comprising:
The input terminal of the switch unit accesses input voltage by inductance, and the output end of the switch unit connects the high pressure
The switch control terminal of boosting unit.
5. booster circuit according to claim 1, which is characterized in that the switch unit, comprising: the N of low conduction impedance
The p-type Metal-oxide-semicondutor field of type metal-oxide semiconductor fieldeffect transistor NMOS tube or low conduction impedance effect
Answer transistor PMOS tube.
6. booster circuit according to claim 1, which is characterized in that the high voltage step-up unit, comprising:
First power tube of output end ground connection；
Output end connects the second power tube of the input terminal of first power tube, and the input terminal of second power tube connects institute
The output end of high voltage step-up unit is stated, second power tube connect the high voltage step-up with the common end of first power tube
The switch control terminal of unit；
The input terminal of short-circuit observation circuit, the short circuit observation circuit connects the output end of the high voltage step-up unit, described short
The input terminal of the first output end connection control circuit of road observation circuit, the second output terminal of the short circuit observation circuit connect institute
State the first signal output end of high voltage step-up unit；The short circuit observation circuit is used to monitor the output of the high voltage step-up unit
Voltage issues control signal and first signal when the output voltage is less than preset threshold voltage；
The control circuit that output end is connected with the input terminal of driving circuit, for sending out when receiving the control signal
Cut-off signals out；
First output end connects the driving circuit of the control terminal of the first power tube, and the second output terminal of the driving circuit connects
Connect the control terminal of the second power tube；The driving circuit is used for when receiving the cut-off signals, turns off first power
Pipe and the second power tube.
7. booster circuit according to claim 6, which is characterized in that first power tube, comprising: NMOS tube or PMOS
Pipe.
8. booster circuit according to claim 6, which is characterized in that second power tube, comprising: high voltage PMOS pipe or
High pressure NMOS pipe.
9. a kind of charger characterized by comprising the booster circuit as described in claim 1-8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811562805.XA CN109639110B (en) | 2018-12-20 | 2018-12-20 | Boost circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811562805.XA CN109639110B (en) | 2018-12-20 | 2018-12-20 | Boost circuit and charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109639110A true CN109639110A (en) | 2019-04-16 |
| CN109639110B CN109639110B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811562805.XA Active CN109639110B (en) | 2018-12-20 | 2018-12-20 | Boost circuit and charger |
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209313708U (en) * | 2018-12-20 | 2019-08-27 | 上海艾为电子技术股份有限公司 | A kind of booster circuit and charger |
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| JP2001327067A (en) * | 2000-05-16 | 2001-11-22 | Fuji Photo Film Co Ltd | Boosting dc-dc converter circuit and imaging device |
| EP1503488A1 (en) * | 2003-07-30 | 2005-02-02 | Favess Co. Ltd. | Trouble determining apparatus for DC boosting circuit |
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