CN111398852A - Power output short circuit detection circuit and electronic equipment - Google Patents
Power output short circuit detection circuit and electronic equipment Download PDFInfo
- Publication number
- CN111398852A CN111398852A CN202010241634.1A CN202010241634A CN111398852A CN 111398852 A CN111398852 A CN 111398852A CN 202010241634 A CN202010241634 A CN 202010241634A CN 111398852 A CN111398852 A CN 111398852A
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- switch module
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- resistor
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
- H04M1/72415—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories for remote control of appliances
Abstract
The invention is suitable for the technical field of power supply circuits, and provides a power supply output short circuit detection circuit and electronic equipment, wherein the power supply output short circuit detection circuit comprises: the main control module and the switch module; the input end of the switch module is connected with the external positive electrode power source end, the output end of the switch module is connected with the main control module, and the control end of the switch module is connected with the output end of the power supply; the switch module is switched on or switched off according to the voltage value of the output end of the power supply, the main control module determines the short-circuit state of the power supply output according to the voltage value of the output end of the switch module, and an alarm is given according to the short-circuit state. The invention converts the voltage of the power output end into an electric signal and sends the electric signal to the main control module, the main control module determines the short circuit state of the power output end according to the level and sends an alarm, and maintenance personnel can be informed in time through various modes such as a software interface pop window, short message prompt and the like, so that the maintenance personnel can find the power output short circuit in time and eliminate faults, and potential safety hazards are eliminated.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a power supply output short circuit detection circuit and electronic equipment.
Background
In an electronic device, in order to ensure the safety of the electronic device, an output end of a general power supply, for example, a 12V output power supply or a 3.3V output power supply of a main control chip, is connected in series with a self-recovery fuse, and if one end of the self-recovery fuse opposite to the output end of the power supply is short-circuited to the ground, if a short-circuit fault cannot be found and eliminated in time, the fuse will be heated, aged and burnt out due to a long-time short circuit.
Many set up L ED lamp at power output terminal among the prior art and instruct the short circuit, only rely on maintainer to observe the discovery short circuit, indicate the effect not good, consequently maintainer can not in time discover power output short circuit and get rid of the trouble, have very big potential safety hazard.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power output short circuit detection circuit and an electronic device, so as to solve the problem in the prior art that a great potential safety hazard exists because a maintenance worker cannot find a short circuit and remove a fault in time when indicating a power output short circuit through L ED.
A first aspect of an embodiment of the present invention provides a power output short-circuit detection circuit, where an output terminal of a power supply is connected in series to a self-healing fuse, the power output short-circuit detection circuit including: the main control module and the switch module;
the input end of the switch module is connected with the external positive electrode power source end, the output end of the switch module is connected with the main control module, and the control end of the switch module is connected with the output end of the power supply;
the switch module is switched on or switched off according to the voltage value of the output end of the power supply, and the main control module determines the short-circuit state of the power supply output according to the voltage value of the output end of the switch module and gives an alarm according to the short-circuit state.
Optionally, the switch module includes: the circuit comprises a switching tube, a first resistor, a second resistor and a third resistor;
a first end of the switching tube is respectively connected with an input end of the switching module and a first end of the first resistor, a second end of the switching tube is respectively connected with a second end of the first resistor and a first end of the second resistor, and a third end of the switching tube is respectively connected with a first end of the third resistor and an output end of the switching module;
the second end of the second resistor is connected with the control end of the switch module, and the second end of the third resistor is grounded.
Optionally, the switch tube includes a triode;
and the emitting electrode of the triode is connected with the first end of the switch tube, the collector electrode of the triode is connected with the third end of the switch tube, and the base electrode of the triode is connected with the second end of the switch tube.
Optionally, the triode is a PNP type triode.
Optionally, the switch module further includes: a capacitor;
the capacitor is connected in parallel with the first resistor.
Optionally, the switch module further includes: a fourth resistor;
and the first end of the fourth resistor is connected with the third end of the switch tube, and the second end of the fourth resistor is connected with the output end of the switch module.
Optionally, the power output short-circuit detection circuit is configured to detect a short circuit of one power output or a short circuit of at least two power outputs;
the power output short circuit detection circuit further comprises: at least one unidirectional conducting element; the number of the one-way conduction elements is consistent with the number of paths of the power supply output;
the positive electrode of the first one-way conduction element is connected with the control end of the switch module, and the negative electrode of the first one-way conduction element is connected with the output end of the corresponding power supply; wherein the first one-way conduction element is any one of the at least one-way conduction element.
Optionally, the first unidirectional conducting element comprises a diode.
Optionally, the output end of the switch module is connected to a general I/O port of the main control module.
A second aspect of the embodiments of the present invention provides an electronic device, including the power output short circuit detection circuit provided in the first aspect of the embodiments of the present invention.
The embodiment of the invention provides a power output short circuit detection circuit, which comprises: the main control module and the switch module; the input end of the switch module is connected with the external positive electrode power source end, the output end of the switch module is connected with the main control module, and the control end of the switch module is connected with the output end of the power supply; the switch module is switched on or switched off according to the voltage value of the output end of the power supply, the main control module determines the short-circuit state of the power supply output according to the voltage value of the output end of the switch module, and an alarm is given according to the short-circuit state. According to the embodiment of the invention, the voltage of the power output end is converted into the electric signal to be sent to the main control module, the main control module determines the short circuit state of the power output end according to the level and sends out an alarm, and maintenance personnel can be informed in time through various modes such as a software interface pop-up window and short message prompt, so that the maintenance personnel can find the power output short circuit in time and remove faults, and potential safety hazards are eliminated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic system structure diagram of a power output short-circuit detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a switch module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a power output short-circuit detection circuit for multiple power outputs according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, an embodiment of the present invention provides a power output short-circuit detection circuit, an output terminal of a power supply is connected in series to a self-recovery fuse F1, and the power output short-circuit detection circuit includes: a main control module 12 and a switch module 11.
The input end of the switch module 11 is connected with an external positive electrode power supply end VCC, the output end of the switch module is connected with the main control module 12, and the control end of the switch module is connected with the output end of the power supply;
the switch module 11 is turned on or off according to the voltage value of the output end of the power supply, and the main control module 12 determines the short-circuit state of the power supply output according to the voltage value of the output end of the switch module 11 and gives an alarm according to the short-circuit state.
According to the characteristic of the self-recovery fuse F1, when the end of the self-recovery fuse F1 opposite to the output end of the power supply is short-circuited to the ground, the resistance value is increased, and the voltage value of the output end of the power supply is reduced.
In some embodiments, referring to fig. 2, the switch module 11 may include: a switch tube Q2, a first resistor R5, a second resistor R6 and a third resistor R8.
The first end of the switching tube Q2 is connected to the input end of the switch module 11 and the first end of the first resistor R5, the second end of the switching tube Q2 is connected to the second end of the first resistor R5 and the first end of the second resistor R6, and the third end of the switching tube Q2 is connected to the first end of the third resistor R8 and the output end of the switch module 11;
the second terminal of the second resistor R6 is connected to the control terminal of the switch module 11, and the second terminal of the third resistor R8 is grounded.
In a normal state, the voltage drop between the two ends of the self-recovery fuse F1 is very small, the voltage value of the power output end is normal, the switching tube Q2 is disconnected, and the output end of the switching module 11 outputs a low level; when the self-recovery fuse F1 is short-circuited to ground, the self-recovery fuse F1 generates heat, the resistance value increases, the voltage drop between the two ends increases, accordingly, the voltage value of the power output end decreases, the switch tube Q2 is turned on, and the output end of the switch module 11 outputs a high level. The main control module 12 determines that the short circuit state is a short circuit when detecting that the output end of the switch module 11 outputs a high level, and then triggers software popup alarm or short message alarm to prompt maintenance personnel to perform maintenance in time.
In some embodiments, the switching tube Q2 may include a triode.
And an emitter of the triode is connected with the first end of the switching tube Q2, a collector of the triode is connected with the third end of the switching tube Q2, and a base of the triode is connected with the second end of the switching tube Q2.
In some embodiments, the transistor may be a PNP transistor. For example, the triode may be of type S9012.
In some embodiments, the switch module 11 may further include: a capacitance C2;
the capacitor C2 is connected in parallel with the first resistor R5.
In some embodiments, the switch module 11 may further include: and a fourth resistor R7.
The first end of the fourth resistor R7 is connected to the third end of the switching tube Q2, and the second end is connected to the output end of the switching module 11.
In some embodiments, the power output short detection circuit is configured to detect a short circuit of one power output or a short circuit of at least two power outputs;
the power output short circuit detection circuit may further include: at least one unidirectional conducting element; the number of the one-way conduction elements is consistent with the number of paths of the power supply output;
the positive electrode of the first one-way conduction element is connected with the control end of the switch module 11, and the negative electrode of the first one-way conduction element is connected with the output end of the corresponding power supply; wherein the first one-way conduction element is any one of the at least one-way conduction element.
Referring to fig. 3, the on-board chip U1 includes 8 power outputs, each of which is connected in series with a self-recovery fuse (F2, F3, F4, F5, F6, F7, F8, F9), and the power output short circuit detection circuit includes 8 unidirectional conductive elements (D2, D3, D4, D5, D6, D7, D8, D9), wherein the positive pole of each unidirectional conductive element is connected to the second end of the second resistor R6, and the negative pole of each unidirectional conductive element is connected to the output terminal of the corresponding power supply.
When a plurality of paths of power supply outputs, different paths of power supply outputs can be isolated by arranging the one-way conduction element, and meanwhile, the plurality of paths of power supply outputs can share one short-circuit detection circuit without arranging one short-circuit detection circuit corresponding to each path of power supply output, so that the number of devices is reduced, and the cost is reduced.
In some embodiments, the power supply output voltage may be 12V or 3.3V.
In some embodiments, the first unidirectional conducting element may comprise a diode. For example, the diode model may be 1N 4148W.
In some embodiments, the output of the switch module 11 may be connected to a general I/O port of the main control module 12.
The embodiment of the invention also provides electronic equipment which comprises the power output short-circuit detection circuit provided by the embodiment of the invention.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A power output short-circuit detection circuit, wherein an output terminal of a power supply is connected in series with a self-recovery fuse, the power output short-circuit detection circuit comprising: the main control module and the switch module;
the input end of the switch module is connected with the external positive electrode power source end, the output end of the switch module is connected with the main control module, and the control end of the switch module is connected with the output end of the power supply;
the switch module is switched on or switched off according to the voltage value of the output end of the power supply, and the main control module determines the short-circuit state of the power supply output according to the voltage value of the output end of the switch module and gives an alarm according to the short-circuit state.
2. The power output short detection circuit of claim 1, wherein the switch module comprises: the circuit comprises a switching tube, a first resistor, a second resistor and a third resistor;
a first end of the switching tube is respectively connected with an input end of the switching module and a first end of the first resistor, a second end of the switching tube is respectively connected with a second end of the first resistor and a first end of the second resistor, and a third end of the switching tube is respectively connected with a first end of the third resistor and an output end of the switching module;
the second end of the second resistor is connected with the control end of the switch module, and the second end of the third resistor is grounded.
3. The power output short detection circuit of claim 2, wherein the switching tube comprises a triode;
and the emitting electrode of the triode is connected with the first end of the switch tube, the collector electrode of the triode is connected with the third end of the switch tube, and the base electrode of the triode is connected with the second end of the switch tube.
4. The power supply output short circuit detection circuit as claimed in claim 3, wherein the transistor is a PNP type transistor.
5. The power output short detection circuit of claim 2, wherein the switch module further comprises: a capacitor;
the capacitor is connected in parallel with the first resistor.
6. The power output short detection circuit of claim 2, wherein the switch module further comprises: a fourth resistor;
and the first end of the fourth resistor is connected with the third end of the switch tube, and the second end of the fourth resistor is connected with the output end of the switch module.
7. The power output short-circuit detection circuit of claim 1, wherein the power output short-circuit detection circuit is configured to detect a short-circuit of one power output or a short-circuit of at least two power outputs;
the power output short circuit detection circuit further comprises: at least one unidirectional conducting element; the number of the one-way conduction elements is consistent with the number of paths of the power supply output;
the positive electrode of the first one-way conduction element is connected with the control end of the switch module, and the negative electrode of the first one-way conduction element is connected with the output end of the corresponding power supply; wherein the first one-way conduction element is any one of the at least one-way conduction element.
8. The power output short detection circuit of claim 7, wherein the first unidirectional conducting element comprises a diode.
9. The power output short circuit detection circuit as claimed in any one of claims 1 to 8, wherein the output terminal of the switch module is connected to the general I/O port of the main control module.
10. An electronic device comprising the power supply output short-circuit detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241634.1A CN111398852A (en) | 2020-03-31 | 2020-03-31 | Power output short circuit detection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241634.1A CN111398852A (en) | 2020-03-31 | 2020-03-31 | Power output short circuit detection circuit and electronic equipment |
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| CN111398852A true CN111398852A (en) | 2020-07-10 |
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| CN202010241634.1A Pending CN111398852A (en) | 2020-03-31 | 2020-03-31 | Power output short circuit detection circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684369A (en) * | 2020-11-25 | 2021-04-20 | 华帝股份有限公司 | Wind pressure switch detection system for preventing short circuit between wires of gas appliance |
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Application publication date: 20200710 |