CN112285473A - Electric bicycle battery overdischarge detection device - Google Patents
Electric bicycle battery overdischarge detection device Download PDFInfo
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- CN112285473A CN112285473A CN202011187989.3A CN202011187989A CN112285473A CN 112285473 A CN112285473 A CN 112285473A CN 202011187989 A CN202011187989 A CN 202011187989A CN 112285473 A CN112285473 A CN 112285473A
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000000087 stabilizing effect Effects 0.000 claims description 26
- 230000005669 field effect Effects 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 3
- 239000013543 active substance Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J43/00—Arrangements of batteries
- B62J43/10—Arrangements of batteries for propulsion
- B62J43/16—Arrangements of batteries for propulsion on motorcycles or the like
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an overdischarge detection device for batteries of electric bicycles, which effectively solves the problem that the prior art sets a fixed termination voltage to cause overdischarge phenomenon or the electric quantity can not be fully utilized, a voltage sensor U1 and a current sensor U2 of the invention detect the terminal voltage signal of a single battery and the discharge current signal of the battery, the terminal voltage signal is compared with the preset terminal voltage value on a window comparator, when the first OR gate circuit is conducted, the battery is indicated to be about to generate an over-discharge phenomenon, the alarm signal output by the discharge current detection circuit is amplified by the signal output circuit and then output to the display screen, so that people are reminded of the about-to-generate over-discharge phenomenon of the battery, the influence on the travel of people is reduced, the termination voltage is set to be in a range, and the problem that the over-discharge phenomenon or the electric quantity cannot be fully utilized due to the fact that the fixed termination voltage is set is avoided.
Description
Technical Field
The invention relates to the field of electric bicycles, in particular to an over-discharge detection device for a battery of an electric bicycle.
Background
The electric bicycle is an upgraded version of the bicycle in the understanding range of the common public, and a mode of providing power for the bicycle by pedaling pedals with two feet is replaced by a mode of providing power for the bicycle by a storage battery, so that a special scenery between the automobile and the bicycle on the road is formed.
Commercially available is a 18650 lithium battery pack consisting of 6 or more individual lithium batteries to power an electric bicycle. Most people have a habit that the batteries of the just bought electric bicycles are completely discharged and recharged, and the batteries of the electric bicycles are easy to form an overdischarge phenomenon when the batteries are completely discharged and recharged, the internal pressure of the lithium batteries is increased due to overdischarge, the reversibility of positive and negative active substances is damaged, the damage is irreversible, and the capacity can be obviously attenuated even if the batteries are only partially recovered.
In order to solve the problem, the prior art generally detects whether the terminal voltage of a single battery of a lithium battery pack reaches a termination voltage, the termination voltage is generally set to be a fixed voltage, and when the detected terminal voltage is less than or equal to the termination voltage, the terminal voltage is determined to be an overdischarge phenomenon, so that the battery is stopped supplying power to an electric bicycle.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an intelligent network automobile fault detection device, which effectively solves the problems that the prior art sets a fixed termination voltage to cause an overdischarge phenomenon or electric quantity cannot be fully utilized.
The technical scheme includes that the over-discharge detection device for the battery of the electric bicycle comprises a terminal voltage detection circuit, a discharge current detection circuit and a signal output circuit, wherein the terminal voltage detection circuit uses a voltage sensor U1 to detect terminal voltage signals at two ends of a single battery, uses an operational amplifier U3B and an operational amplifier U4B as a window comparator to compare, and outputs an obtained result to a first OR gate circuit formed by a diode D2, a diode D4 and a resistor R7, the first OR gate circuit outputs the terminal voltage signals to the discharge current detection circuit, the discharge current detection circuit uses a current sensor U2 to detect a discharge current signal of the battery, the discharge current signal outputs the discharge current signal to a second OR gate circuit formed by the diode D5 and the diode D6 after a voltage stabilizing tube D1 is conducted and outputs an alarm signal to the signal output circuit, the signal output circuit utilizes an alarm signal to conduct the triode Q1, and then utilizes the field effect transistor Q2, the triode Q3, the voltage stabilizing tube D7, the voltage stabilizing tube D8 and the thyristor Q4 to amplify the alarm signal and output the amplified alarm signal to the display screen.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
the terminal voltage signal of the single battery and the discharging current signal of the battery are detected by arranging a voltage sensor U1 and a current sensor U2, the terminal voltage signal is compared with a preset termination voltage on an operational amplifier U3B and an operational amplifier U4B serving as window comparators, when a first OR gate circuit consisting of a diode D2, a diode D4 and a resistor R7 is conducted, the overdischarge phenomenon of the single battery is about to occur, the termination voltage is set to be a range, the problem that the overdischarge phenomenon or the electric quantity cannot be fully utilized due to the fact that the fixed termination voltage is set is avoided, a second OR gate circuit consisting of a diode D5 and a diode D6 is conducted to output an alarm signal, and the alarm signal is amplified by using a field effect transistor Q2, a triode Q3, a voltage stabilizing tube D7, a voltage stabilizing tube D8 and a thyristor Q4 and then is output to a display screen to remind people that the overdischarge phenomenon is about to, the use is required to be stopped, and the battery is powered, so that the influence on the journey of people is reduced.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
An overdischarge detection device for a battery of an electric bicycle, which is applied to the battery of the electric bicycle and starts to work when the electric bicycle is started by a key, comprises a terminal voltage detection circuit, a discharge current detection circuit and a signal output circuit, wherein the terminal voltage detection circuit uses a plurality of voltage sensors similar to JD1688DO-7BO as a voltage sensor U1 to detect terminal voltage signals of single batteries, when the electric bicycle is started by the key, a switch S1 is in a connection state, the terminal voltage signals are transmitted to an in-phase end and an out-of-phase end of an operational amplifier U3B and an operational amplifier U4B in two paths by using a diode D3, the operational amplifier U3B and the operational amplifier U4B are used as window comparators to detect whether the amplitude of the terminal voltage signals is within the range of the terminal voltage of the battery, and when the amplitude of the terminal voltage signals is not within the range of the terminal voltage, that is, lower than the lowest value of the range, that is, 3V or higher than 3.25V, the operational amplifier U4B or U3B outputs a high level, the diode D4 or D2 is turned on, the diode D4 is turned on, the first or gate circuit composed of the diode D2, the diode D4 and the resistor R7 is turned on, which indicates that the terminal voltage of the two ends of the battery is about to reach the end voltage, the first or gate circuit outputs the terminal voltage signal to the discharge current detection circuit, which detects the discharge current signal of the battery by using the current sensor U2 while detecting the terminal voltage signal, the current sensor U2 uses a current sensor similar to the AHKC-EKA type as the current sensor U2, the resistor R5 is used to convert the discharge current signal from the current state to the voltage state, the resistor R5 and the resistor R6 form a voltage dividing circuit, the voltage dividing circuit divides the discharge current signal, the voltage stabilizing value of the voltage regulator tube D1 is selected to be a voltage value smaller than the maximum discharge current, when the voltage regulator tube D1 is conducted reversely by the divided discharge current signal, the overcurrent phenomenon of the battery is indicated to happen at the moment, the diode D5 is conducted, the second OR gate circuit formed by the diode D5 and the diode D6 is conducted, the terminal voltage signal output by the terminal voltage detection circuit to the discharge current detection circuit is input to the diode D6, when the diode D5 or the diode D6 or both are conducted, the second OR gate circuit is conducted to output an alarm signal to the signal output circuit, the signal output circuit conducts the triode Q1 by the alarm signal output by the discharge current detection circuit, after the triode Q1 is conducted, the buzzer LS1 is triggered to send out an alarm sound to remind people of the occurrence of overdischarge of the battery, when the amplified alarm signal conducts the voltage stabilizing tube D7 and the voltage stabilizing tube D8, the alarm signal is not in the voltage stabilizing range of the voltage stabilizing tube D7 and the voltage stabilizing tube D8, the thyristor Q4 is conducted at the moment, the overvoltage signal is fed back to the field effect tube Q2 and the triode Q3 to be amplified again, and finally the signal is displayed on the display, so that the occurrence of an overdischarge phenomenon is reminded in advance;
the terminal voltage detection circuit adopts a plurality of voltage sensors similar to JD1688DO-7BO as a voltage sensor U1 to detect terminal voltage signals of single batteries, when the electric bicycle is started by a key, a switch S1 is in a connection state, a positive power supply VCC supplies power to the voltage sensor U1 through a resistor R1 and a capacitor C1, the resistor R1 and the capacitor C1 filter ripples and noises existing in the positive power supply VCC to avoid influencing the terminal voltage signals collected by the voltage sensor U1, the terminal voltage signals are transmitted to an in-phase end and an out-phase end of an operational amplifier U3B, an operational amplifier U4B in two ways by a diode D3, the operational amplifier U3B and the operational amplifier U4B are used as window comparators to detect whether the amplitude of the terminal voltage signals is within the range of the terminal voltage of the batteries, generally 2.75V-3V, and the range of the terminal voltage is set to be 3V-3.25V, when the amplitude of the terminal voltage signal is in the range of the termination voltage, the operational amplifier U3B and the operational amplifier U4B output low level to disable the diode D2 and the diode D4 from conducting, the first or gate circuit composed of the diode D2, the diode D4 and the resistor R7 from conducting, when the amplitude of the terminal voltage signal is not in the range of the termination voltage, i.e. lower than the lowest value of the range, i.e. 3V or higher than 3.25V, the operational amplifier U4B or U3B outputs high level to conduct the diode D4 or the diode D2, the first or gate circuit is conducting to indicate that the terminal voltage of the two terminals of the battery is about to reach the termination voltage, when it is detected that the battery pack is about to reach the termination voltage, the termination voltage is set to a range to avoid the problem that the over-discharge phenomenon or the under-utilization caused by setting a fixed termination voltage, the first or gate circuit outputs the terminal voltage signal to the discharge current detection circuit, a voltage division circuit is formed by a resistor R2, a resistor R3 and an adjustable resistor R4, when an operational amplifier U3B and an operational amplifier U4B are used as comparators, voltage values to be compared with terminal voltage signals detected by a voltage sensor U1 are provided, the voltage division circuit comprises a voltage sensor U1, a VCC pin of the voltage sensor U1 is respectively connected with one end of a resistor R1 and one end of a capacitor C1, an out pin of a capacitor U1 is connected with an anode of a diode D3, a cathode of a diode D3 is respectively connected with a non-inverting end of an operational amplifier U3B and an inverting end of an operational amplifier U4B, inverting ends of the operational amplifier U3B are respectively connected with one end of a resistor R2 and one end of a resistor R3, the other end of the resistor R2 is respectively connected with one end of a resistor R2 and one end of a switch S2, the other end of the switch S2 is connected with a positive power supply VCC, the other end of the resistor R2 is respectively connected with a right end of the resistor R2, the output end of the operational amplifier U2 and an output end of, the output end of the operational amplifier U4B is connected with the anode of a diode D4, the cathode of a diode D4 is respectively connected with the cathode of the diode D2 and one end of a resistor R7, and the left end of an adjustable resistor R4 is respectively connected with a gnd pin of a voltage sensor U1, the other end of a capacitor C1 and the adjustable end of the adjustable resistor R4 and is grounded;
the discharging current detection circuit detects a terminal voltage signal by using a current sensor U2 while detecting the terminal voltage signal, the current sensor U2 is used as the current sensor U2, the resistor R5 is used for converting the discharging current signal from a current state to a voltage state for convenient processing, the resistor R5 and the resistor R6 form a voltage division circuit, the discharging current signal is divided to avoid the discharging current signal from damaging the discharging current detection circuit due to overlarge discharging current signal, the voltage stabilization value of a voltage stabilizing tube D1 is selected to be a voltage value smaller than the maximum discharging current, when the voltage-divided discharging current signal reversely conducts the voltage stabilizing tube D1, the discharging current signal is larger, the diode D5 is conducted, a second or gate circuit formed by the diode D5 and the diode D6 is conducted, the terminal voltage signal output by the terminal voltage detection circuit to the discharging current detection circuit is input to the diode D6, when the diode D5 is conducted or the diode D6 is conducted or both are conducted, the second OR gate circuit is conducted to output an alarm signal to the signal output circuit, the alarm signal comprises a current sensor U2, a gnd pin of the current sensor U2 is respectively connected with one end of a resistor R8, one end of a resistor R6, an adjustable end of an adjustable resistor R4 in the terminal voltage detection circuit, the left end of an adjustable resistor R4, a gnd pin of the voltage sensor U1 and the other end of a resistor R7, the out pin of the current sensor U2 is connected with one end of a resistor R5, the other end of the resistor R5 is respectively connected with the other end of a resistor R6 and the cathode of a regulator D1, the anode of the regulator D1 is connected with the anode of the diode D5, the cathode of the diode D5 is respectively connected with the other end of a resistor R8 and the cathode of a diode D6, and the anode of the diode D6 is respectively connected with the cathode of a diode D2 in the terminal voltage detection, The negative electrode of the diode D4, one end of the resistor R7 and the vcc pin of the current sensor U2 are respectively connected with the vcc pin of the voltage sensor U1, one end of the resistor R1 and one end of the capacitor C1 in the voltage detection circuit;
the signal output circuit utilizes an alarm signal output by the discharge current detection circuit to conduct the triode Q1, after the triode Q1 is conducted, the buzzer LS1 is triggered to send out alarm sound to remind people that the battery is about to be overdischarged and needs to be charged and can not be used continuously, the alarm signal is firstly transmitted to the amplifying circuit formed by the field effect tube Q2 and the triode Q3 to be amplified so as to be convenient for the display on the electric bicycle to display, the resistor R14 and the resistor R11 form a voltage dividing circuit to provide proper base voltage for the field effect tube Q2, when the voltage stabilizing tube D7 and the voltage stabilizing tube D8 are conducted by the amplified alarm signal, the alarm signal is shown not to be in the voltage stabilizing range of the voltage stabilizing tube D7 and the voltage stabilizing tube D8, the thyristor Q4 is conducted at the moment, the alarm signal is fed back to the field effect tube Q2 and the triode Q3 to be re-amplified, and finally the battery of the electric bicycle is prompted to be overdischarged on the, the device needs to be stopped and supplies power to a battery, and comprises a resistor R9, one end of a resistor R9 is respectively connected with the cathode of a diode D5, the other end of a resistor R8 and the cathode of a diode D6 in a discharge current detection circuit, the other end of a resistor R9 is respectively connected with the base of a triode Q1 and one end of a resistor R10, the other end of a resistor R10 is respectively connected with one end of a resistor R11, the emitter of a triode Q1, one end of a resistor R12, one end of a capacitor C2, the cathode of a thyristor Q4, one end of a resistor R16 and one end of a resistor R17 and is grounded, the collector of the triode Q17 is respectively connected with one end of a buzzer LS 17, one end of the resistor R17, the other end of the resistor R17, the gate of a field effect transistor Q17 and the anode of the thyristor Q17, the other end of the buzzer LS 17 is connected with one end of the resistor R17, the other end of the resistor R17 is respectively connected with, the source electrode of the field effect transistor Q2 is connected with the base electrode of the triode Q3, the collector electrode of the triode Q3 is respectively connected with the drain electrode of the field effect transistor Q2, the other end of the resistor R15, the negative electrode of the voltage regulator tube D7, the positive electrode of the voltage regulator tube C8 and the display, and the positive electrode of the voltage regulator tube D7 is respectively connected with the negative electrode of the voltage regulator tube D8, the other end of the resistor R16, the other end of the resistor R17 and the control electrode of the thyristor Q4.
When the invention is used in concrete, the terminal voltage detection circuit adopts a plurality of voltage sensors U1 to detect terminal voltage signals of single batteries, when the electric bicycle is started by a key, the switch S1 is in a connection state, the terminal voltage signals are transmitted to the in-phase end and the anti-phase end of the operational amplifier U3B and the operational amplifier U4B in two paths by using a diode D3, the operational amplifier U3B and the operational amplifier U4B are used as window comparators to detect whether the amplitude of the terminal voltage signals is in the range of the terminal voltage of the batteries, and when the amplitude of the terminal voltage signals is not in the range of the terminal voltage, namely is lower than the lowest value of the range, namely 3V or higher than 3.25V, the operational amplifier U4B or U3B outputs high level, the diode D4 or the diode D2 is conducted, the diode D4 is conducted, the first or gate circuit composed of the diode D2, the diode D4 and the resistor R7 is conducted, which indicates that the terminal voltage of the battery is about to reach the terminal, a first OR gate circuit and outputs a terminal voltage signal to a discharge current detection circuit, the discharge current detection circuit detects a discharge current signal of the battery by using a current sensor U2 while detecting the terminal voltage signal, a resistor R5 is used for firstly converting the discharge current signal from a current state to a voltage state, a resistor R5 and a resistor R6 form a voltage division circuit, when the divided discharge current signal reversely conducts a voltage regulator tube D1, the discharge current signal is larger at the moment, a diode D5 is conducted, a second OR gate circuit consisting of a diode D5 and a diode D6 is conducted, the terminal voltage signal output by the terminal voltage detection circuit to the discharge current detection circuit is input to the diode D6, when the diode D5 or the diode D6 or the diode D5 and the diode D6 and the second OR gate circuit are conducted, and outputs an alarm signal to a signal output circuit, the signal output circuit utilizes an alarm signal output by the discharge current detection circuit to conduct a triode Q1, after a triode Q1 is conducted, a buzzer LS1 is triggered to send out alarm sound to remind people that the battery is about to be over-discharged, the battery needs to be charged and cannot be used continuously, the alarm signal is firstly transmitted to an amplifying circuit formed by a field effect tube Q2 and the triode Q3 to be amplified so as to be convenient for a display on the electric bicycle to display, when the voltage stabilizing tube D7 and the voltage stabilizing tube D8 are conducted by the amplified alarm signal, the alarm signal is shown not to be in a voltage stabilizing range of the voltage stabilizing tube D7 and the voltage stabilizing tube D8, the thyristor Q4 is conducted at the moment, the overvoltage signal is fed back to the field effect tube Q2 and the triode Q3 to be re-amplified, and finally the overvoltage signal is displayed on the display;
the method comprises the steps of detecting terminal voltage signals of a single battery and discharging current signals of the battery by arranging a voltage sensor U1 and a current sensor U2, comparing the terminal voltage signals with preset terminal voltage values on an operational amplifier U3B and an operational amplifier U4B serving as window comparators, indicating that the single battery is about to generate overdischarge when a first OR gate circuit consisting of a diode D2, a diode D4 and a resistor R7 is conducted, setting the termination voltage to be a range, avoiding the problem that the overdischarge phenomenon or electric quantity cannot be fully utilized due to the fact that fixed termination voltage is set, indicating that the discharging current signals are larger when a stabilivolt D1 is conducted by the discharging current signals, outputting alarm signals by conducting a second OR gate circuit consisting of the diode D5 and a diode D6, amplifying the alarm signals by utilizing a field effect transistor Q2, a triode Q3, the stabilivolt D7, the stabilivolt D8 and a thyristor Q4, and outputting the alarm signals to a display screen, the battery can be reminded of the impending overdischarge phenomenon of the battery, the battery needs to be stopped, the power is supplied to the battery, and the battery can be reminded of the occurrence of the overdischarge phenomenon in advance.
Claims (4)
1. A battery overdischarge detection device for an electric bicycle is characterized by comprising a terminal voltage detection circuit, a discharge current detection circuit and a signal output circuit, wherein the terminal voltage detection circuit is used for detecting terminal voltage signals of two ends of a single battery by a voltage sensor U1 and using an operational amplifier U3B and an operational amplifier U4B as window comparators to compare, and outputting obtained results to a first OR gate circuit consisting of a diode D2, a diode D4 and a resistor R7, the first OR gate circuit outputs the terminal voltage signals to the discharge current detection circuit, the discharge current detection circuit is used for detecting discharge current signals of the battery by a current sensor U2, the discharge current signals output the discharge current signals to a second OR gate circuit consisting of the diode D5 and a diode D6 after a voltage stabilizing tube D1 is conducted and output alarm signals to the signal output circuit, the signal output circuit utilizes an alarm to conduct the triode Q1, and then utilizes the field effect transistor Q2, the triode Q3, the voltage stabilizing tube D7, the voltage stabilizing tube D8 and the thyristor Q4 to amplify and output the alarm signal to the display screen.
2. The battery overdischarge detection device for the electric bicycle according to claim 1, wherein the terminal voltage detection circuit comprises a voltage sensor U1, the VCC pin of the voltage sensor U1 is connected to one end of a resistor R1 and one end of a capacitor C1 respectively, the out pin of the capacitor sensor U1 is connected to the positive terminal of a diode D3, the negative terminal of a diode D3 is connected to the non-inverting terminal of an operational amplifier U3B and the inverting terminal of an operational amplifier U4B respectively, the inverting terminal of the operational amplifier U3B is connected to one end of a resistor R2 and one end of a resistor R3 respectively, the other terminal of a resistor R2 is connected to one end of a resistor R1 and one end of a switch S1 respectively, the other terminal of a switch S1 is connected to a positive power source VCC, the other terminal of a resistor R3 is connected to the right terminal of an adjustable resistor R4 and the non-inverting terminal of the operational amplifier U4B respectively, the output terminal of the operational amplifier U3B is connected to the positive terminal of a diode D2, the cathode of the diode D4 is connected to the cathode of the diode D2 and one end of the resistor R7, respectively, and the left end of the adjustable resistor R4 is connected to the gnd pin of the voltage sensor U1, the other end of the capacitor C1, and the adjustable end of the adjustable resistor R4, and is grounded.
3. The over-discharge detection device for the battery of the electric bicycle as claimed in claim 1, wherein the discharge current detection circuit comprises a current sensor U2, wherein the gnd pin of the current sensor U2 is connected to one end of a resistor R8, one end of a resistor R6, the adjustable end of an adjustable resistor R4 in the terminal voltage detection circuit, the left end of an adjustable resistor R4, the gnd pin of a voltage sensor U1, and the other end of a resistor R7, respectively, and connected to ground, the out pin of the current sensor U2 is connected to one end of a resistor R5, the other end of the resistor R5 is connected to the other end of a resistor R6, and the cathode of a diode D1, the anode of a diode D1 is connected to the anode of a diode D5, the cathode of a diode D5 is connected to the other end of a resistor R8 and the cathode of a diode D6, and the anode of a diode D6 is connected to the cathode of a diode D2 and the cathode of a diode D4 in the, One end of the resistor R7 and the vcc pin of the current sensor U2 are respectively connected with the vcc pin of the voltage sensor U1, one end of the resistor R1 and one end of the capacitor C1 in the voltage detection circuit.
4. The over-discharge detection device for the battery of the electric bicycle according to claim 1, wherein the signal output circuit comprises a resistor R9, one end of the resistor R9 is connected to the negative electrode of the diode D5, the other end of the resistor R8 and the negative electrode of the diode D6 in the discharge current detection circuit, the other end of the resistor R9 is connected to the base of the transistor Q1 and one end of the resistor R10, the other end of the resistor R10 is connected to one end of the resistor R11, the emitter of the transistor Q1, one end of the resistor R12, one end of the capacitor C2, the cathode of the thyristor Q4, one end of the resistor R16 and one end of the resistor R17, respectively, the collector of the transistor Q1 is connected to one end of the buzzer LS1, one end of the resistor R14, the other end of the resistor R11, the gate of the fet Q2 and the anode of the thyristor Q4, the other end of the buzzer LS 4 is connected to one end of the resistor R4, and the other end of the resistor R4 is, The other end of the resistor R15 and the other end of a switch S1 in the terminal voltage detection circuit are connected with a positive polarity power supply VCC, a source electrode of a field effect tube Q2 is connected with a base electrode of a triode Q3, a collector electrode of a triode Q3 is respectively connected with a drain electrode of the field effect tube Q2, the other end of the resistor R15, a cathode of a voltage regulator tube D7, an anode of a voltage regulator tube C8 and a display, and an anode of a voltage regulator tube D7 is respectively connected with a cathode of the voltage regulator tube D8, the other end of a resistor R16, the other end of a resistor R17 and a control electrode of a thyristor Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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