CN113866672B - Abnormal state alarm circuit, device and method for charger - Google Patents
Abnormal state alarm circuit, device and method for charger Download PDFInfo
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- CN113866672B CN113866672B CN202111023342.1A CN202111023342A CN113866672B CN 113866672 B CN113866672 B CN 113866672B CN 202111023342 A CN202111023342 A CN 202111023342A CN 113866672 B CN113866672 B CN 113866672B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/55—Testing for incorrect line connections
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the technical field of chargers and discloses a circuit, a device and a method for alarming abnormal states of a charger. The abnormal state alarm circuit of the charger comprises: the device comprises a control module, a grounding detection module, a reverse connection detection module and an alarm module; the grounding detection module is used for outputting a grounding abnormal signal to the control module when the shell of the charger is not grounded; the reverse connection detection module is used for outputting a reverse connection signal to the control module when the batteries are reversely connected; the control module is used for outputting a first abnormal signal to the alarm module when receiving the grounding abnormal signal and outputting a second abnormal signal to the alarm module when receiving the reverse connection signal; and the alarm module is used for sending out a first alarm signal according to the first abnormal signal and sending out a second alarm signal according to the second abnormal signal. According to the invention, the charger circuit is improved, and the alarm is timely output while the grounding abnormality and the reverse connection abnormality are sensitively detected, so that the use safety of the charger is improved.
Description
Technical Field
The invention relates to the field of electric automobile charging control, in particular to a charger abnormal state alarm circuit, a device and a method.
Background
With the development of new energy automobiles, electric automobiles are becoming more popular, and the electric automobiles need to be charged by using a charger, so that the charger is also applied more. In the use of the charger, some artificial or non-artificial abnormal conditions, such as reverse connection of a battery and poor grounding of the problem of the charger, the former can cause reverse current flow of the charger due to reverse connection of a circuit, so that the charger is damaged, the latter can cause danger of personnel contacts, and the charger on the market does not relate to a scheme for timely alarming and reminding related personnel aiming at abnormal states.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a self-locking control circuit, a self-locking control device and a self-locking control method, and aims to solve the technical problem that abnormal states of a charger cannot be timely alarmed in the prior art.
In order to achieve the above object, the present invention provides a charger abnormal state alarm circuit, the charger abnormal state alarm circuit includes: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery;
the grounding detection module is used for outputting a grounding abnormal signal to the control module when the shell of the charger is not grounded;
the reverse connection detection module is used for outputting a reverse connection signal to the control module when the batteries are reversely connected;
the control module is used for outputting a first abnormal signal to the alarm module when the grounding abnormal signal is received, and outputting a second abnormal signal to the alarm module when the reverse connection signal is received;
the alarm module is used for sending out a first alarm signal according to the first abnormal signal and sending out a second alarm signal according to the second abnormal signal.
Optionally, the ground detection module comprises a ground detection unit and a signal output unit which are sequentially connected, wherein the input end of the ground detection unit is connected with a mains supply and a charger shell, and the output end of the signal output unit is connected with the control module;
the grounding detection unit is used for outputting an abnormal voltage signal to the signal output unit when the charger shell is not grounded;
the signal output unit is used for outputting a grounding abnormal signal to the control module according to the abnormal voltage signal.
Optionally, the ground detection unit includes: first to fourth capacitors, wherein,
the first capacitor is connected with the fourth capacitor end to end, a node between the first capacitor and the fourth capacitor is connected with a mains supply fire wire, a node between the fourth capacitor and the third capacitor is connected with a charger shell, a node between the second capacitor and the third capacitor is connected with a mains supply zero wire, a node between the first capacitor and the second capacitor is connected with a first input end of the signal output unit, and a node between the fourth capacitor and the third capacitor is also connected with a second input end of the signal output unit.
Optionally, the signal output unit includes: a fifth capacitor, first to fifth diodes, a first resistor and a second resistor,
the first end of the first resistor is connected with a node between the first capacitor and the second capacitor, the second end of the first resistor is connected with the cathode of the first diode, the fifth capacitor is connected in parallel with the two ends of the first resistor, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the cathode of the fourth diode, the anode of the fourth diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the anode of the first diode;
the cathode of the third diode is also connected with the node between the fourth capacitor and the third capacitor;
the cathode of the second diode is also connected with the cathode of the fifth diode, the anode of the fifth diode is connected with the anode of the third diode, and the second resistor is connected in parallel at two ends of the fifth diode;
and two ends of the second resistor are also connected with the control module.
Optionally, the reverse connection detection module includes: a battery socket, third to sixth resistors, a photocoupler, and a sixth diode, wherein,
the positive electrode interface of the battery socket is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first control end of the photoelectric coupler, the second control end of the photoelectric coupler is connected with the cathode of the sixth diode, the anode of the sixth diode is connected with one end of the third resistor, and the other end of the third resistor is connected with the negative electrode interface of the battery socket;
the first controlled end of the photoelectric coupler is connected with an external power supply, the second controlled end of the photoelectric coupler is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the control module, the second controlled end of the photoelectric coupler is also connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with direct current ground, and the second end of the sixth resistor is also connected with the control module.
Optionally, the photocoupler includes: a light emitting diode and a phototransistor; wherein,
the anode of the light-emitting diode is connected with the cathode of the sixth diode, and the cathode of the light-emitting diode is connected with the second end of the fourth resistor;
the collector of the phototriode is connected with the external power supply, the emitter of the phototriode is connected with the first end of the fifth resistor, and the base of the phototriode is coupled with the light emitting diode.
Optionally, the first alarm signal includes a first alarm sound wave signal and a first alarm light signal, and the second alarm signal includes a second alarm sound wave signal and a second alarm light signal.
Optionally, the alarm module comprises a buzzer and an LED connected with the control module, wherein,
the buzzer is used for sending out the first alarm sound wave signal according to the first abnormal signal and sending out the second alarm sound wave signal according to the second abnormal signal;
the LED is used for emitting the first alarm light signal according to the first abnormal signal and emitting the second alarm light signal according to the second abnormal signal.
In addition, in order to achieve the purpose, the invention further provides an abnormal state alarming device of the charger, and the abnormal state alarming device of the charger is as described above.
In addition, in order to achieve the above purpose, the invention also provides a method for alarming abnormal state of the charger, the method is applied to the alarming circuit for abnormal state of the charger, and the alarming circuit for abnormal state of the charger comprises the following steps: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery;
the abnormal state alarm of the charger comprises the following steps:
the grounding detection module outputs a grounding abnormal signal to the control module when the shell of the charger is not grounded;
the reverse connection detection module outputs a reverse connection signal to the control module when the battery is reversely connected;
the control module outputs a first abnormal signal to the alarm module when receiving the grounding abnormal signal, and outputs a second abnormal signal to the alarm module when receiving the reverse connection signal;
the alarm module sends out a first alarm signal according to the first abnormal signal and sends out a second alarm signal according to the second abnormal signal.
The invention sets an abnormal state alarm circuit of a charger, which comprises: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery; the grounding detection module is used for outputting a grounding abnormal signal to the control module when the shell of the charger is not grounded; the reverse connection detection module is used for outputting a reverse connection signal to the control module when the batteries are reversely connected; the control module is used for outputting a first abnormal signal to the alarm module when the grounding abnormal signal is received, and outputting a second abnormal signal to the alarm module when the reverse connection signal is received; the alarm module is used for sending out a first alarm signal according to the first abnormal signal and sending out a second alarm signal according to the second abnormal signal. According to the invention, the charger circuit is improved, and the alarm is timely output while the grounding abnormality and the reverse connection abnormality are sensitively detected, so that the use safety of the charger is improved.
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 in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a functional block diagram of an embodiment of an alarm circuit for an abnormal state of a battery charger according to the present invention;
FIG. 2 is a schematic diagram of a circuit configuration of an embodiment of an abnormal state alarm circuit of a battery charger according to the present invention;
fig. 3 is a flowchart of a first embodiment of the method for alarming abnormal states of a battery charger according to the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 00 | Control module | U | Photoelectric coupler |
| 10 | Grounding detection module | D | Light emitting diode |
| 20 | Reverse connection detection module | Q | Phototriode |
| 30 | Alarm module | Bat | Battery socket |
| 11 | Grounding detection unit | GND | DC ground |
| 12 | Signal output unit | VCC | External power supply |
| 31 | Buzzer | L | Commercial power fire wire |
| 32 | LED | PE | Grounded (earth) |
| C1～C5 | First to fifth capacitors | N | Commercial power zero line |
| R1～R6 | First to sixth resistors | + | Positive electrode interface |
| D1～D6 | First to sixth diodes | - | Negative electrode interface |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist and is not within the scope of protection claimed by the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a functional module of an embodiment of an abnormal state alarm circuit of a battery charger according to the present invention;
the abnormal state alarm circuit of the charger comprises: the battery charger comprises a control module 00, a grounding PE detection module 10, a reverse connection detection module 20 and an alarm module 30, wherein the grounding PE detection module 10, the reverse connection detection module 20 and the alarm module 30 are respectively connected with the control module 00, the input end of the grounding PE detection module 10 is connected with a mains supply and a charger shell, and the input end of the reverse connection detection module 20 is connected with a battery;
the grounded PE detection module 10 is configured to output a grounded PE abnormal signal to the control module 00 when the battery casing is not grounded PE.
It should be noted that, the grounded PE detection module 10 may at least include a grounded PE detection unit 11, and the ungrounded PE detection unit 11 may output different voltages according to the grounded PE condition of the battery case.
It can be understood that the battery charger housing should be reliably grounded to PE under normal conditions, at this time, the normal potential of the battery charger housing is zero, when the battery charger housing is grounded to PE and is abnormal, the potential of the battery charger housing approaches the potential of the mains zero line N infinitely, and in both cases, the potentials of the battery charger housing are different, so that when the battery charger housing is not grounded to PE, a grounded PE abnormal signal can be output to the control module 00, and the grounded PE abnormal signal can be a voltage signal.
The reverse connection detection module 20 is configured to output a reverse connection signal to the control module 00 when the battery is reversely connected.
It will be appreciated that the voltage signal directions detected by the reverse connection detection modules 20 at both ends of the battery are different according to the forward connection and the reverse connection of the battery, so that different signals can be output according to the connection of the battery.
The control module 00 is configured to output a first abnormal signal to the alarm module 30 when the ground PE abnormal signal is received, and output a second abnormal signal to the alarm module 30 when the reverse connection signal is received.
It should be noted that, the control module 00 may be a chip capable of performing charging control, and the chip should have a data processing function and an analog-to-digital conversion function, convert the grounded PE abnormal signal and the reverse connection signal into digital signals, and output a first abnormal signal and the second abnormal signal according to the grounded PE abnormal signal and the reverse connection signal.
The alarm module 30 is configured to send out a first alarm signal according to the first abnormal signal, and send out a second alarm signal according to the second abnormal signal.
It should be noted that, the alarm module 30 includes at least a functional module capable of alarming, for example: the buzzer 31, the LED32 lamp, the display screen and the voice module, where the functional module may be started by the first abnormal signal and the second abnormal signal and send out a corresponding first alarm signal and the second alarm signal, and the first alarm signal and the second alarm signal may be different alarm sounds sent out by the buzzer 31, different lighting forms of the LED32 lamp, display information of the display screen and a voice mode of the voice module, which is not limited in this embodiment.
The embodiment provides a battery charger abnormal state alarm circuit, the battery charger abnormal state alarm circuit includes: the battery charger comprises a control module 00, a grounding PE detection module 10, a reverse connection detection module 20 and an alarm module 30, wherein the grounding PE detection module 10, the reverse connection detection module 20 and the alarm module 30 are respectively connected with the control module 00, the input end of the grounding PE detection module 10 is connected with a mains supply and a charger shell, and the input end of the reverse connection detection module 20 is connected with a battery; the grounded PE detection module 10 is configured to output a grounded PE abnormal signal to the control module 00 when the battery casing is not grounded PE; the reverse connection detection module 20 is configured to output a reverse connection signal to the control module 00 when the battery is reversely connected; the control module 00 is configured to output a first abnormal signal to the alarm module 30 when the ground PE abnormal signal is received, and output a second abnormal signal to the alarm module 30 when the reverse connection signal is received; the alarm module 30 is configured to send out a first alarm signal according to the first abnormal signal, and send out a second alarm signal according to the second abnormal signal. According to the invention, the charger circuit is improved, and the alarm is timely output while the grounding PE abnormality and the reverse connection abnormality are sensitively detected, so that the use safety of the charger is improved.
Further, referring to fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of an abnormal state alarm circuit of a battery charger according to the present invention;
the grounding PE detection module 10 comprises a grounding PE detection unit 11 and a signal output unit 12 which are sequentially connected, wherein the input end of the grounding PE detection unit 11 is connected with a mains supply and a charger shell, and the output end of the signal output unit 12 is connected with the control module 00;
the grounded PE detection unit 11 is configured to output an abnormal voltage signal to the signal output unit 12 when the battery case is not grounded PE.
It should be noted that, the grounded PE detection unit 11 at least includes an unbalanced bridge, and the unbalanced bridge may output an ac voltage signal when the battery case is not grounded PE, where the ac voltage signal is an abnormal voltage signal.
The signal output unit 12 is configured to output a ground PE abnormal signal to the control module 00 according to the abnormal voltage signal.
It should be noted that, the signal output unit 12 may process the abnormal voltage signal, so as to output a dc voltage signal, which is the ground PE abnormal signal.
In this embodiment, the reliability of the ground PE detection and signal output is improved by dividing the ground PE detection module 10 into two parts for detection and processing.
Further, with continued reference to fig. 2, the grounded PE detection unit 11 includes: first to fourth capacitances C1 to C4, wherein,
the first to fourth capacitors C1 to C4 are connected end to end, a node between the first capacitor C1 and the fourth capacitor C4 is connected with a mains supply fire wire L, a node between the fourth capacitor C4 and the third capacitor C3 is connected with a charger shell, a node between the second capacitor C2 and the third capacitor C3 is connected with a mains supply zero wire N, a node between the first capacitor C1 and the second capacitor C2 is connected with a first input end of the signal output unit 12, and a node between the fourth capacitor C4 and the third capacitor C3 is also connected with a second input end of the signal output unit 12.
It can be understood that the first to fourth capacitors C1 to C4 form an unbalanced bridge, a first output end of the unbalanced bridge is a node between the first capacitor C1 and the second capacitor C2, a second output end of the unbalanced bridge is a node between the first capacitor C1 and the third capacitor C3, the second output end is connected with the charger housing, when the charger housing is grounded PE, the voltage at the second output end is 0V, and the voltage at the first output end is 110V, and when the charger housing is not grounded PE, the second output end is infinitely close to and directly connected with the mains zero line N, so that an ac electric signal of 110V can be formed approximately with the first output end.
Further, with continued reference to fig. 2, the signal output unit 12 includes: a fifth capacitor C5, first to fifth diodes D1 to D5, a first resistor R1 and a second resistor R2, wherein,
a first end of the first resistor R1 is connected with a node between the first capacitor C1 and the second capacitor C2, a second end of the first resistor R1 is connected with a cathode of the first diode D1, the fifth capacitor C5 is connected in parallel with two ends of the first resistor R1, a cathode of the first diode D1 is connected with an anode of the second diode D2, a cathode of the second diode D2 is connected with a cathode of the fourth diode D4, an anode of the fourth diode D4 is connected with a cathode of the third diode D3, and an anode of the third diode D3 is connected with an anode of the first diode D1;
the cathode of the third diode D3 is further connected to a node between the fourth capacitor C4 and the third capacitor C3;
the cathode of the second diode D2 is further connected with the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected with the anode of the third diode D3, and the second resistor R2 is connected in parallel to two ends of the fifth diode D5;
the two ends of the second resistor R2 are also connected with the control module 00.
In this embodiment, the first resistor R1 and the fifth capacitor C5 are used for protecting a circuit, the first to fourth diodes D4 form a rectifier bridge, a first input terminal of the rectifier bridge is a node between the first diode D1 and the second diode D2, a second input terminal of the rectifier bridge is a node between the third diode D3 and the fourth diode D4, when the grounded PE detection unit 11 outputs a 110V ac signal, the rectifier bridge converts the 110V ac signal into a dc signal, and the fifth diode D5 is a zener diode, so that an output voltage of the circuit can be maintained and stabilized within a detectable range, and meanwhile, the safety of the circuit operation is ensured.
Further, with continued reference to fig. 2, the reverse connection detection module 20 includes: a battery socket Bat, third to sixth resistors R6, a photo coupler U, and a sixth diode D6, wherein,
the positive electrode interface+ of the battery socket Bat is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the first control end of the photoelectric coupler U, the second control end of the photoelectric coupler U is connected with the cathode of the sixth diode D6, the anode of the sixth diode D6 is connected with one end of the third resistor R3, and the other end of the third resistor R3 is connected with the negative electrode interface-of the battery socket Bat;
the first controlled end of the photo coupler U is connected with an external power supply VCC, the second controlled end of the photo coupler U is connected with the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected with the control module 00, the second controlled end of the photo coupler U is further connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the direct current ground GND, and the second end of the sixth resistor R6 is further connected with the control module 00.
In this embodiment, when the battery is connected in the forward direction, no current flows in the loop due to the effect of the diode, so that the photo coupler U cannot be turned on at this time, and only when the battery is connected in the reverse direction, the diode is turned on, so that the photo coupler U is turned on, and a reverse connection signal is output to the control module 00. In specific implementation, the charger can be designed to start working only when the reverse connection signal is not received, so that the charger is further protected from voltage backflow.
Further, with continued reference to fig. 2, the photo-coupler U includes: a light emitting diode D and a phototriode Q; wherein,
the anode of the light emitting diode D is connected to the cathode of the sixth diode D6, and the cathode of the light emitting diode D is connected to the second end of the fourth resistor R4.
It will be appreciated that when there is a current in the loop, the led D is turned on and emits an optical signal.
The collector of the phototriode Q is connected with the external power supply VCC, the emitter of the phototriode Q is connected with the first end of the fifth resistor R5, and the base of the phototriode Q is coupled with the light emitting diode D.
It can be understood that the phototransistor Q is a NPN phototransistor, the base of the triode is turned on after receiving the light signal sent by the light emitting diode D, and a current flows through the emitter at this time, and the fifth resistor R5 and the sixth resistor R6 are used for voltage sampling, where the sampled voltage is a reverse connection signal.
In the embodiment, the optical coupler is used for reversely connecting the signal output, so that the interference of the signal output is eliminated.
Further, with continued reference to fig. 2, the first alarm signal includes a first alarm sound wave signal and a first alarm light signal, and the second alarm signal includes a second alarm sound wave signal and a second alarm light signal.
It may be understood that the first alarm sound wave signal may be an alarm sound sent by the buzzer 31 and indicating that the grounded PE is abnormal, the first alarm light signal may be a lighting mode in which the LED32 indicates that the grounded PE is abnormal, the second alarm sound wave signal may be an alarm sound sent by the buzzer 31 and indicating that the battery is reversely connected, and the second alarm light signal may be a lighting mode in which the LED32 indicates that the battery is reversely connected.
Further, with continued reference to fig. 2, the alarm module 30 includes a buzzer 31 and an LED32 connected to the control module 00, wherein,
the buzzer 31 is configured to send out the first alarm sound wave signal according to the first abnormal signal, and send out the second alarm sound wave signal according to the second abnormal signal.
The LED32 is configured to send out the first alarm light signal according to the first abnormal signal, and send out the second alarm light signal according to the second abnormal signal.
The embodiment provides two fault alarm modes, so that when the situation that the grounding PE of the charger is abnormal and the battery is reversely connected is realized, the alarm is more timely and visual, the use safety of the charger is further ensured, and the personal safety of an operator is also ensured.
Fig. 3 is a flowchart of a first embodiment of the method for alarming abnormal states of a battery charger according to the present invention.
Referring to fig. 3, the method is applied to the abnormal state warning circuit of the charger, which comprises the following steps: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery;
the abnormal state alarm of the charger comprises the following steps:
step S10: and the grounding detection module outputs a grounding abnormal signal to the control module when the battery charger shell is not grounded.
It should be noted that, the ground detection module may at least include a ground detection unit, and the non-ground detection unit may output different voltages according to the ground condition of the battery charger housing.
It can be understood that the battery charger shell should be reliably grounded under normal conditions, at this time, the normal potential of the battery charger shell is zero, when the battery charger shell is grounded and abnormal occurs, the potential of the battery charger shell is infinitely close to the potential of the zero line of the mains supply, and under the two conditions, the potentials of the battery charger shell are different, so that the abnormal grounding signal can be output to the control module when the battery charger shell is not grounded, and the abnormal grounding signal can be a voltage signal.
Step S20: and the reverse connection detection module outputs a reverse connection signal to the control module when the battery is reversely connected.
It can be understood that the voltage signal directions detected by the reverse connection detection modules at the two ends of the battery are different according to the forward connection and the reverse connection of the battery, so that different signals can be output according to the connection method of the battery.
Step S30: the control module outputs a first abnormal signal to the alarm module when receiving the grounding abnormal signal, and outputs a second abnormal signal to the alarm module when receiving the reverse connection signal.
It should be noted that, the control module may be a chip capable of performing charging control, and the chip should have a data processing function and an analog-to-digital conversion function, convert the ground fault signal and the reverse connection signal into digital signals, and output a first fault signal and the second fault signal according to the ground fault signal and the reverse connection signal.
Step S40: the alarm module sends out a first alarm signal according to the first abnormal signal and sends out a second alarm signal according to the second abnormal signal.
It should be noted that, the alarm module at least includes a functional module capable of alarming, for example: the buzzer, the LED lamp, the display screen and the voice module, the functional module may be started by the first abnormal signal and the second abnormal signal and send out the corresponding first alarm signal and the second alarm signal, and the first alarm signal and the second alarm signal may be different alarm sounds sent out by the buzzer, different lighting forms of the LED lamp, display information of the display screen and voice mode of the voice module.
The battery charger abnormal state alarm party adopts all the technical schemes of all the embodiments, so that the battery charger abnormal state alarm party has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.
In addition, in order to achieve the purpose, the invention further provides a charger abnormal state alarm device, and the charger abnormal state alarm device comprises the charger abnormal state alarm circuit.
The abnormal state alarm device of the charger adopts all the technical schemes of all the embodiments, so that the abnormal state alarm device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.
It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.
It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.
In addition, technical details which are not described in detail in the embodiment can be referred to the abnormal state warning circuit of the charger provided in any embodiment of the present invention, and are not described herein.
Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. 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 system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. Read Only Memory)/RAM, magnetic disk, optical disk) and including several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (5)
1. An abnormal state alarm circuit of a charger is characterized in that the abnormal state alarm circuit of the charger comprises: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery;
the grounding detection module is used for outputting a grounding abnormal signal to the control module when the shell of the charger is not grounded;
the reverse connection detection module is used for outputting a reverse connection signal to the control module when the batteries are reversely connected;
the control module is used for outputting a first abnormal signal to the alarm module when the grounding abnormal signal is received, and outputting a second abnormal signal to the alarm module when the reverse connection signal is received;
the alarm module is used for sending out a first alarm signal according to the first abnormal signal and sending out a second alarm signal according to the second abnormal signal;
the grounding detection module comprises a grounding detection unit and a signal output unit which are sequentially connected, wherein the input end of the grounding detection unit is connected with the mains supply and the charger shell, and the output end of the signal output unit is connected with the control module;
the grounding detection unit is used for outputting an abnormal voltage signal to the signal output unit when the charger shell is not grounded;
the signal output unit is used for outputting a grounding abnormal signal to the control module according to the abnormal voltage signal;
the ground detection unit includes: a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein,
the first capacitor and the fourth capacitor are connected end to end, a node between the first capacitor and the fourth capacitor is connected with a mains supply fire wire, a node between the fourth capacitor and the third capacitor is connected with a charger shell, a node between the second capacitor and the third capacitor is connected with a mains supply zero wire, a node between the first capacitor and the second capacitor is connected with a first input end of the signal output unit, and a node between the fourth capacitor and the third capacitor is also connected with a second input end of the signal output unit;
the signal output unit includes: a fifth capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first resistor and a second resistor, wherein,
the first end of the first resistor is connected with a node between the first capacitor and the second capacitor, the second end of the first resistor is connected with the cathode of the first diode, the fifth capacitor is connected in parallel with the two ends of the first resistor, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the cathode of the fourth diode, the anode of the fourth diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the anode of the first diode;
the cathode of the third diode is also connected with the node between the fourth capacitor and the third capacitor;
the cathode of the second diode is also connected with the cathode of the fifth diode, the anode of the fifth diode is connected with the anode of the third diode, and the second resistor is connected in parallel at two ends of the fifth diode;
the two ends of the second resistor are also connected with the control module;
the reverse connection detection module comprises: a battery socket, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a photoelectric coupler and a sixth diode, wherein,
the positive electrode interface of the battery socket is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first control end of the photoelectric coupler, the second control end of the photoelectric coupler is connected with the cathode of the sixth diode, the anode of the sixth diode is connected with one end of the third resistor, and the other end of the third resistor is connected with the negative electrode interface of the battery socket;
the first controlled end of the photoelectric coupler is connected with an external power supply, the second controlled end of the photoelectric coupler is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the control module, the second controlled end of the photoelectric coupler is also connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with a direct current ground, and the second end of the sixth resistor is also connected with the control module;
the photocoupler includes: a light emitting diode and a phototransistor; wherein,
the anode of the light-emitting diode is connected with the cathode of the sixth diode, and the cathode of the light-emitting diode is connected with the second end of the fourth resistor;
the collector of the phototriode is connected with the external power supply, the emitter of the phototriode is connected with the first end of the fifth resistor, and the base of the phototriode is coupled with the light emitting diode.
2. The battery charger abnormal state warning circuit of claim 1, wherein the first warning signal comprises a first warning sound signal and a first warning light signal, and the second warning signal comprises a second warning sound signal and a second warning light signal.
3. The battery charger abnormal state alarm circuit according to claim 2, wherein the alarm module comprises a buzzer and an LED connected with the control module, wherein,
the buzzer is used for sending out the first alarm sound wave signal according to the first abnormal signal and sending out the second alarm sound wave signal according to the second abnormal signal;
the LED is used for emitting the first alarm light signal according to the first abnormal signal and emitting the second alarm light signal according to the second abnormal signal.
4. A battery charger abnormal state warning device, characterized in that the device comprises a battery charger abnormal state warning circuit as claimed in any one of claims 1 to 3.
5. A method for alarming abnormal state of a battery charger, wherein the method is applied to the abnormal state alarming circuit of a battery charger according to any one of claims 1 to 3, and the abnormal state alarming circuit of a battery charger comprises: the control module, and the grounding detection module, the reverse connection detection module and the alarm module are respectively connected with the control module, wherein the input end of the grounding detection module is connected with the mains supply and the shell of the charger, and the input end of the reverse connection detection module is connected with the battery;
the abnormal state alarm of the charger comprises the following steps:
the grounding detection module outputs a grounding abnormal signal to the control module when the shell of the charger is not grounded;
the reverse connection detection module outputs a reverse connection signal to the control module when the battery is reversely connected;
the control module outputs a first abnormal signal to the alarm module when receiving the grounding abnormal signal, and outputs a second abnormal signal to the alarm module when receiving the reverse connection signal;
the alarm module sends out a first alarm signal according to the first abnormal signal and sends out a second alarm signal according to the second abnormal signal.
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