CN109639110B - Boost circuit and charger - Google Patents
Boost circuit and charger Download PDFInfo
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- CN109639110B CN109639110B CN201811562805.XA CN201811562805A CN109639110B CN 109639110 B CN109639110 B CN 109639110B CN 201811562805 A CN201811562805 A CN 201811562805A CN 109639110 B CN109639110 B CN 109639110B
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- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 24
- 230000005669 field effect Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
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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
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- 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
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- H02J7/0072—
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- Dc-Dc Converters (AREA)
Abstract
The invention provides a boost circuit, which comprises a high-voltage boost unit and a switch unit; the switch unit is connected with the high-voltage boosting unit, wherein the control end of the switch unit is connected with the first signal output end of the high-voltage boosting unit; when the high-voltage boosting unit judges that the output voltage of the output end of the high-voltage boosting unit is smaller than the threshold voltage, a first signal is output; and when the control end of the switch unit receives the first signal, the switch unit is turned off to ensure that the communication between the high-voltage boosting unit and the load loop is cut off. According to the boost circuit disclosed by the embodiment of the invention, the problem that the high-voltage boost unit is burnt out when the load circuit is short-circuited is solved by adding the switch unit, so that the boost circuit disclosed by the embodiment of the invention can be automatically powered off when the load circuit is short-circuited, and the safety of the boost circuit is improved; in addition, the booster circuit disclosed by the invention is simple in structure, so that the booster circuit is convenient to widely apply.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a booster circuit and a charger.
Background
In recent years, electronic products are continuously developed, and in order to meet the long-term use demands of people, the battery capacity of the electronic products is continuously increased, but the problem is that the charging time is longer and longer. It is desirable to reduce the charging time without a decrease in battery capacity to achieve a more extreme use experience.
Therefore, the charging time can only be reduced by increasing the charging rate of the electronic product without reducing the battery capacity of the electronic product. The method of increasing the charge rate may be by increasing the current at the time of charging or by increasing the voltage at the time of charging. However, more products in the market today use the second method. It can be speculated from the market performance that the high-pressure boost product can be widely applied in future.
However, the current high-voltage boosting products still have the problem of circuit protection. When the load circuit is short-circuited, the high-voltage boost chip cannot be powered off although a short-circuit monitoring circuit is built in, so that the high-voltage boost chip is easy to burn out.
Disclosure of Invention
In view of this, in order to solve the problem that the high-voltage boosting unit is burned out when the load circuit is short-circuited, the present invention provides a boosting circuit.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the first aspect of the present invention provides a booster circuit, comprising:
the high-voltage boosting unit is used for outputting a first signal when the output voltage of the high-voltage boosting unit is judged to be smaller than the threshold voltage;
the control end of the switch unit is connected with the output end of the first signal of the high-voltage boosting unit; and the switch unit is used for switching off the switch unit when receiving a first signal, so that the communication between the high-voltage boosting unit and the load loop is cut off.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switch unit is connected with the output end of the high-voltage boosting unit, and the output end of the switch unit is connected with the input end of the load circuit.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switch unit is connected with the output end of the load circuit, and the output end of the switch unit is connected with the protection ground end of the high-voltage boosting unit.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switching unit is connected with input voltage through an inductor, and the output end of the switching unit is connected with the switch control end of the high-voltage boosting unit.
Optionally, the switching unit includes: an N-type metal-oxide-semiconductor field effect transistor NMOS transistor with low on-resistance or a P-type metal-oxide-semiconductor field effect transistor PMOS transistor with low on-resistance.
Optionally, the high-voltage boosting unit includes:
the output end of the first power tube is grounded;
the output end of the second power tube is connected with the input end of the first power tube, the input end of the second power tube is connected with the output end of the high-voltage boosting unit, and the common end of the second power tube and the first power tube is connected with the switch control end of the high-voltage boosting unit;
the input end of the short circuit monitoring circuit is connected with the output end of the high-voltage boosting unit, the first output end of the short circuit monitoring circuit is connected with the input end of the control circuit, and the second output end of the short circuit monitoring circuit is connected with the first signal output end of the high-voltage boosting unit; the short circuit monitoring circuit is used for monitoring the output voltage of the high-voltage boosting unit, and when the output voltage is smaller than a preset threshold voltage, a control signal and the first signal are sent out.
The output end of the control circuit is connected with the input end of the driving circuit and is used for sending out a turn-off signal when receiving the control signal;
the first output end of the driving circuit is connected with the control end of the first power tube, and the second output end of the driving circuit is connected with the control end of the second power tube; the driving circuit is used for switching off the first power tube and the second power tube when receiving the switching-off signal.
Optionally, the first power tube includes: NMOS tube or PMOS tube.
Optionally, the second power tube includes: a high voltage PMOS tube or a high voltage NMOS tube.
A second aspect of the present invention provides a charger comprising: a boost circuit as claimed in any one of the first aspects.
Compared with the prior art, the high-voltage power supply device has the advantages that the switch unit connected with the high-voltage boosting unit is added, when the high-voltage boosting unit judges that the voltage output by the high-voltage boosting unit is smaller than the threshold voltage, the first signal is sent to the switch unit, the switch unit is turned off after receiving the first signal, so that the communication between the high-voltage boosting unit and the load loop is cut off, and the burning of the high-voltage boosting unit caused by the short circuit of the load circuit is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an application of a boost circuit according to the prior art;
FIG. 2 is a simplified schematic diagram of an application of a boost circuit according to the prior art;
FIG. 3 is a schematic diagram of an application of a boost circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an application of a boost circuit according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of an application of a boost circuit according to another embodiment of the present invention;
fig. 6 is a schematic diagram of an application of a boost circuit according to another embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The prior art provides a boost circuit, the specific circuit is shown in fig. 1, and for better illustration, a load circuit is connected to both ends of the boost circuit in fig. 1.
Referring to fig. 1, in the entire circuit, a short circuit occurs in the load circuit 120, resulting in a decrease in the output voltage of the high voltage boosting unit 110. However, the high voltage boosting unit 110 may be provided with a short circuit monitoring circuit 111, and the short circuit monitoring circuit 111 may monitor the output voltage of the high voltage boosting unit 110 and output a control signal when the output voltage of the high voltage boosting unit 110 is less than the threshold voltage. When the control circuit 112 receives the control signal, it outputs a shutdown signal; after receiving the turn-off signal, the driving circuit disconnects the first power tube M1 and the second power tube M2.
However, since the high voltage boosting unit 110 needs to withstand high voltage, the second power transistor M2 in the high voltage boosting unit 110 may be a high voltage N-type Metal-Oxide-Semiconductor field effect transistor (NMOS) or a high voltage P-type Metal-Oxide-Semiconductor field effect transistor (PMOS), whether an NMOS or a PMOS, as long as the substrate and the source are always shorted, equivalent to a diode D being connected in series between the drain and the source, and the direction of the diode D is always directed from the switch control terminal SW of the high voltage boosting unit 110 to the output terminal VOUT of the high voltage boosting unit 110 due to the process.
Thus, the entire circuit can be simplified as shown in fig. 2. When the load is shorted, the first power tube M1 and the second power tube M2 are turned off, but after the first power tube M1 and the second power tube M2 are turned off, the high-voltage boosting unit 110 still forms a path with the load circuit through the diode D, that is, the current loop of the inductor L is still turned on, the current on the inductor L still increases, and finally the high-voltage boosting unit 110 burns out.
In order to solve the problem that when the load circuit is short-circuited, the high-voltage boosting unit is burnt out, the embodiment of the invention discloses a boosting circuit, and for better explanation, the load circuit is connected with the boosting circuit disclosed in the embodiment of the invention, and the specific circuit structure can be seen in fig. 3: the boost circuit disclosed in this embodiment includes: a high voltage boosting unit 310 and a switching unit M3; wherein:
the switch control end SW of the high-voltage boosting unit 310 is connected with one end of the inductor L; the input end VIN of the high-voltage boosting unit 310 is connected with the other end of the inductor L; the common terminal of the input terminal VIN of the high-voltage boosting unit 310 and the inductor L is connected to an input voltage; the output terminal VOUT of the high voltage boost unit 310 is connected to the input terminal of the load circuit 320, and the output terminal of the load circuit 320 is connected to the input terminal of the switch unit M3.
When the enable terminal EN of the high voltage boosting unit 310 receives the high level signal, the high voltage boosting unit 310 starts to operate. The high voltage boost unit 310 outputs a first signal when it determines that its output voltage is less than the threshold voltage during operation.
The output end of the switch unit M3 is connected with the protection ground end PGND of the high-voltage boosting unit 310; the common ground of the output end of the switch unit M3 and the protection ground PGND of the high voltage boost unit 310; the control terminal of the switching unit M3 is connected to the first signal output terminal Vp of the high voltage boost unit 310.
It should be noted that the switch unit M3 may be an NMOS transistor with low on-resistance or a PMOS transistor with low on-resistance.
The control terminal of the switching unit M3 turns itself off after receiving the first signal output by the high voltage boosting unit 310. The switching unit is turned off, and the communication between the high-voltage boosting unit and the load loop is cut off.
In this embodiment, during the operation of the high-voltage boosting unit 310, the high-voltage boosting unit 310 continuously detects the output voltage of the output terminal VOUT thereof, if the load circuit 320 is shorted, the high-voltage boosting unit 310 determines that the output voltage of the output terminal VOUT thereof is less than the threshold voltage, and outputs the first signal; and, the control end of the switch unit M3 receives the first signal and turns itself off, so as to ensure that the path between the high-voltage boosting unit 310 and the load circuit 320 is cut off, and avoid the overlarge current caused by the short circuit of the load circuit and burn the high-voltage boosting unit 310.
According to the embodiment, the problem that the high-voltage boosting unit is burnt out when the load circuit is short-circuited is solved by adding the switch unit, so that the boosting circuit disclosed by the embodiment can be automatically powered off when the load circuit is short-circuited, and the safety of the boosting circuit disclosed by the embodiment is improved; in addition, the booster circuit disclosed by the embodiment has a simple structure and is convenient for wide application.
Optionally, as shown in fig. 4, in another embodiment of the present invention, another implementation of the connection relationship between the switching unit M3 and the high-voltage boosting unit 310 in the boosting circuit includes:
the control end of the switch unit M3 is connected to the first signal output end Vp of the high voltage boost unit 310, the input end of the switch unit M3 is connected to the output end VOUT of the high voltage boost unit 310, and the output end of the switch unit M3 is connected to the input end of the load circuit 320.
The high voltage boost unit 310 is configured to output a first signal when determining that the output voltage is less than the threshold voltage; the switch unit M3 is configured to turn off itself after receiving the first signal output by the high voltage boost unit 310 at the control end thereof, so as to cut off communication between the high voltage boost unit and the load loop.
In this embodiment, during the operation of the high voltage boost unit 310, the high voltage boost unit 310 continuously detects the output voltage of the output terminal VOUT. If the load circuit 320 is shorted, the high voltage boosting unit 310 determines that the output voltage of the output terminal VOUT is less than the threshold voltage, and outputs a first signal. And, the control end of the switch unit M3 receives the first signal and turns itself off, so as to cut off the communication branch between the output end VOUT of the high-voltage boost unit 310 and the load circuit 320, thereby ensuring that the path between the high-voltage boost unit 310 and the load circuit 320 is cut off, and avoiding the overlarge current caused by the short circuit of the load circuit 320 and burning the high-voltage boost unit 310.
According to the embodiment, the problem that the high-voltage boosting unit is burnt out when the load circuit is short-circuited is solved by adding the switch unit, so that the boosting circuit disclosed by the embodiment can be automatically powered off when the load circuit is short-circuited, and the safety of the boosting circuit disclosed by the embodiment is improved; in addition, the booster circuit disclosed by the embodiment has a simple structure and is convenient for wide application.
Optionally, as shown in fig. 5, in another embodiment of the present invention, another implementation of the connection relationship between the switching unit M3 and the high-voltage boosting unit 310 in the boosting circuit includes:
the control end of the switching unit M3 is connected with the first signal output end Vp of the high-voltage boosting unit 310, the input end of the switching unit M3 is connected with the input voltage through the inductor L, and the output end of the switching unit M3 is connected with the switch control end SW of the high-voltage boosting unit 310.
The high voltage boost unit 310 is configured to output a first signal when determining that the output voltage is less than the threshold voltage; the switch unit M3 is configured to turn off itself after receiving the first signal output by the high voltage boost unit 310 at the control end thereof, so as to cut off communication between the high voltage boost unit and the load loop.
In this embodiment, during the operation of the high voltage boost unit 310, the high voltage boost unit 310 continuously detects the output voltage of the output terminal VOUT. If the load circuit 320 is shorted, the high voltage boosting unit 310 determines that the output voltage of the output terminal VOUT is less than the threshold voltage, and outputs a first signal. And, the control end of the switch unit M3 receives the first signal and turns itself off, and cuts off the communication branch between the inductor L and the switch control end SW of the high-voltage boost unit 310, so as to realize the outage of the high-voltage boost unit 310 and the load circuit 320, and avoid the overlarge current caused by the short circuit of the load circuit 320 and burn the high-voltage boost unit 310.
According to the embodiment, the problem that the high-voltage boosting unit is burnt out when the load circuit is short-circuited is solved by adding the switch unit, so that the boosting circuit disclosed by the embodiment can be automatically powered off when the load circuit is short-circuited, and the safety of the boosting circuit disclosed by the embodiment is improved; in addition, the booster circuit disclosed by the embodiment has a simple structure and is convenient for wide application.
Alternatively, as shown in fig. 6, in another embodiment of the present invention, an implementation of the high-voltage boosting unit 310 includes:
the short circuit monitoring circuit 311, the control circuit 312, the driving circuit 313, and the first and second power transistors M1 and M2.
The input end of the first power tube M1 is connected with the output end of the second power tube M2, and the output end of the first power tube M1 is grounded; the input end of the second power tube M2 is connected with the output end VOUT of the high-voltage boosting unit 310, and the common end of the second power tube M2 and the first power tube M1 is connected with the switch control end SW of the high-voltage boosting unit 310.
The input end of the short circuit monitoring circuit 311 is connected with the output end VOUT of the high-voltage boosting unit 310, the first output end of the short circuit monitoring circuit 311 is connected with the input end of the control circuit 312, and the second output end of the short circuit monitoring circuit 311 is connected with the first signal output end Vp of the high-voltage boosting unit 310.
An input end of the driving circuit 313 is connected with an output end of the control circuit 312, a first output end of the driving circuit 313 is connected with a control end of the first power tube M1, and a second output end of the driving circuit 313 is connected with a control end of the second power tube M2.
It should be noted that, the first power tube M1 may be an NMOS tube or a PMOS tube.
It should be noted that the second power tube M2 may be a high-voltage PMOS tube or a high-voltage NMOS tube.
In the working process of the high-voltage boosting unit 310 of this embodiment, the short-circuit monitoring circuit 311 continuously monitors the output voltage of the output terminal VOUT of the high-voltage boosting unit 310; if the load circuit 320 is shorted, the short-circuit monitoring circuit 311 determines that the output voltage of the output terminal VOUT of the high voltage boost unit 310 is less than the threshold voltage, and outputs the control signal and the first signal.
When the control circuit 312 receives the control signal, it outputs a shutdown signal to the driving circuit 313; after the driving circuit 313 receives the turn-off signal, the first power tube M1 and the second power tube M2 are turned off; meanwhile, the control unit M3 receives the first signal and turns off itself; this ensures that the path between the high voltage boosting unit 310 and the load circuit 320 is cut off, and the high voltage boosting unit 310 is prevented from being burned out due to excessive current caused by the short circuit of the load circuit 320.
According to the embodiment, the problem that the high-voltage boosting unit is burnt out when the load circuit is short-circuited is solved by adding the switch unit, so that the boosting circuit disclosed by the embodiment can be automatically powered off when the load circuit is short-circuited, and the safety of the boosting circuit disclosed by the embodiment is improved; in addition, the booster circuit disclosed by the embodiment has a simple structure and is convenient for wide application.
The embodiment of the invention provides a charger which is suitable for electronic products and comprises a boost circuit; the charger provides higher charging power for the electronic product by increasing the voltage during charging. And the charger increases the charging voltage by a boost circuit included in the charger. The boost circuit converts input voltage into higher voltage through a high-voltage boost unit included by the boost circuit, so as to meet the output requirement of the charger. Meanwhile, the switch unit included in the boost circuit can avoid the problem that the charger is burnt out due to load short circuit, and safety of the charger during charging is improved.
The booster circuit includes:
the high-voltage boosting unit is used for outputting a first signal when the output voltage of the high-voltage boosting unit is judged to be smaller than the threshold voltage;
the control end of the switch unit is connected with the output end of the first signal of the high-voltage boosting unit; and the switch unit is used for switching off the switch unit when receiving a first signal, so that the communication between the high-voltage boosting unit and the load loop is cut off.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switch unit is connected with the output end of the high-voltage boosting unit, and the output end of the switch unit is connected with the input end of the load circuit.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switch unit is connected with the output end of the load circuit, and the output end of the switch unit is connected with the protection ground end of the high-voltage boosting unit.
Optionally, the switch unit is connected to the high-voltage boosting unit, and includes:
the input end of the switching unit is connected with input voltage through an inductor, and the output end of the switching unit is connected with the switch control end of the high-voltage boosting unit.
Optionally, the switching unit includes: an N-type metal-oxide-semiconductor field effect transistor NMOS transistor with low on-resistance or a P-type metal-oxide-semiconductor field effect transistor PMOS transistor with low on-resistance.
Optionally, the high-voltage boosting unit includes:
the output end of the first power tube is grounded;
the output end of the second power tube is connected with the input end of the first power tube, the input end of the second power tube is connected with the output end of the high-voltage boosting unit, and the common end of the second power tube and the first power tube is connected with the switch control end of the high-voltage boosting unit;
the input end of the short circuit monitoring circuit is connected with the output end of the high-voltage boosting unit, the first output end of the short circuit monitoring circuit is connected with the input end of the control circuit, and the second output end of the short circuit monitoring circuit is connected with the first signal output end of the high-voltage boosting unit; the short circuit monitoring circuit is used for monitoring the output voltage of the high-voltage boosting unit, and when the output voltage is smaller than a preset threshold voltage, a control signal and the first signal are sent out.
The output end of the control circuit is connected with the input end of the driving circuit and is used for sending out a turn-off signal when receiving the control signal;
the first output end of the driving circuit is connected with the control end of the first power tube, and the second output end of the driving circuit is connected with the control end of the second power tube; the driving circuit is used for switching off the first power tube and the second power tube when receiving the switching-off signal.
Optionally, the first power tube includes: NMOS tube or PMOS tube.
Optionally, the second power tube includes: a high voltage PMOS tube or a high voltage NMOS tube.
The operation process of the boost circuit is the same as that of the above embodiment, and reference may be made to the above embodiment, which is not repeated here.
The charger disclosed by the embodiment not only provides larger output power for electronic equipment by utilizing the booster circuit, but also shortens the charging time; and the problem that the charging device is burnt out due to load short circuit is also avoided, and the charging safety is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A booster circuit, characterized by comprising:
the high-voltage boosting unit is used for outputting a first signal when judging that the output voltage of the high-voltage boosting unit is smaller than a threshold voltage;
the control end of the switch unit is connected with the output end of the first signal of the high-voltage boosting unit; the switching unit is used for switching off the switching unit when receiving a first signal, so that communication between the high-voltage boosting unit and the load loop is cut off;
the high-voltage boosting unit includes: the output end of the first power tube is grounded;
the output end of the second power tube is connected with the input end of the first power tube, the input end of the second power tube is connected with the output end of the high-voltage boosting unit, and the common end of the second power tube and the first power tube is connected with the switch control end of the high-voltage boosting unit;
the input end of the short circuit monitoring circuit is connected with the output end of the high-voltage boosting unit, the first output end of the short circuit monitoring circuit is connected with the input end of the control circuit, and the second output end of the short circuit monitoring circuit is connected with the first signal output end of the high-voltage boosting unit; the short circuit monitoring circuit is used for monitoring the output voltage of the high-voltage boosting unit, and sending out a control signal and the first signal when the output voltage is smaller than a preset threshold voltage;
the output end of the control circuit is connected with the input end of the driving circuit and is used for sending out a turn-off signal when receiving the control signal;
the first output end of the driving circuit is connected with the control end of the first power tube, and the second output end of the driving circuit is connected with the control end of the second power tube; the driving circuit is used for switching off the first power tube and the second power tube when receiving the switching-off signal.
2. The boost circuit of claim 1, wherein the switching unit is connected to the high voltage boost unit, comprising:
the input end of the switch unit is connected with the output end of the high-voltage boosting unit, and the output end of the switch unit is connected with the input end of the load circuit.
3. The boost circuit of claim 1, wherein the switching unit is connected to the high voltage boost unit, comprising:
the input end of the switch unit is connected with the output end of the load circuit, and the output end of the switch unit is connected with the protection ground end of the high-voltage boosting unit.
4. The boost circuit of claim 1, wherein the switching unit is connected to the high voltage boost unit, comprising:
the input end of the switching unit is connected with input voltage through the inductor, and the output end of the switching unit is connected with the switch control end of the high-voltage boosting unit.
5. The boost circuit of claim 1, wherein the switching unit comprises: an N-type metal-oxide-semiconductor field effect transistor NMOS transistor with low on-resistance or a P-type metal-oxide-semiconductor field effect transistor PMOS transistor with low on-resistance.
6. The boost circuit of claim 1 wherein said first power tube comprises: NMOS tube or PMOS tube.
7. The boost circuit of claim 1 wherein said second power tube comprises: a high voltage PMOS tube or a high voltage NMOS tube.
8. A charger, comprising: a boost circuit as claimed in any one of claims 1 to 7.
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 |
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| Publication Number | Publication Date |
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| CN109639110A CN109639110A (en) | 2019-04-16 |
| CN109639110B true CN109639110B (en) | 2024-04-02 |
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| CN201811562805.XA Active CN109639110B (en) | 2018-12-20 | 2018-12-20 | Boost circuit and charger |
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