CN116316447A - Abnormal voltage protection circuit for storage battery - Google Patents
Abnormal voltage protection circuit for storage battery Download PDFInfo
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- CN116316447A CN116316447A CN202211584911.4A CN202211584911A CN116316447A CN 116316447 A CN116316447 A CN 116316447A CN 202211584911 A CN202211584911 A CN 202211584911A CN 116316447 A CN116316447 A CN 116316447A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application belongs to aviation distribution technical field, concretely relates to battery voltage anomaly protection circuit. The abnormal protection circuit comprises a first comparator U1, wherein the same-direction end of the first comparator U1 is connected to a set protection point of the storage battery, the reverse end of the first comparator U1 is connected with a first reference voltage, and the first comparator U1 is connected with a first diode D1; the same-direction end of the second comparator U2 is connected with a second reference voltage, the reverse end of the second comparator U2 is connected with the set protection point of the storage battery, and the second comparator U2 is connected with a second diode D2; the first diode D1 and the rear end of the second diode D2 are connected in parallel and then connected into a rear-stage protection circuit, and when the first diode D1 or the second diode D2 is conducted, the rear-stage protection circuit is used for cutting off the output of the storage battery, otherwise, the storage battery normally outputs. The method and the device realize quick positioning of the fault position of the storage battery monomer, and improve the maintenance efficiency of the storage battery.
Description
Technical Field
The application belongs to aviation distribution technical field, concretely relates to battery voltage anomaly protection circuit.
Background
In the field of aviation power supply systems, a storage battery is used as an airplane standby power supply, is used for stabilizing voltage when an engine is started and high-power electronic equipment is switched, and keeps normal operation of functions such as communication and navigation of an airplane under emergency conditions, plays a role in airplane safe flight, and is used for realizing charge and discharge control, over-voltage and under-voltage protection and temperature protection of the storage battery.
In the control protection of the output voltage of the storage battery, the charger is used for collecting the output voltage of two ends of the storage battery in the prior art, and the overvoltage and undervoltage protection of the storage battery is realized outside the normal range of the output voltage. However, because the aviation storage battery is generally large in capacity, a plurality of single batteries are required to be connected in series, the storage battery is fully charged from discharging, the voltage values at two ends of the storage battery are within a relatively wide range, and the output voltage in the range is normal. When a certain monomer is damaged, the voltage at two ends of the storage battery can be reduced, but due to the characteristic of wide voltage at two ends of the storage battery, when the voltage at two ends of the storage battery reaches the lower limit or the upper limit in a normal range, whether the storage battery is charged and discharged or the certain monomer is damaged is difficult to judge, if the judgment is improper, the service life of the storage battery is influenced, and the storage battery and a charger circuit are failed and the flight safety is influenced due to heavy judgment. Meanwhile, even if the voltage exceeds the normal range and is judged to be a single fault, the voltage is required to be checked one by one to determine the specific fault single position, the fault positioning is slower, and the maintenance efficiency is lower.
Disclosure of Invention
In order to solve the above-mentioned problem, the present application provides a battery voltage abnormality protection circuit, mainly comprising:
the same-direction end of the first comparator U1 is connected to a set protection point of the storage battery, the reverse end of the first comparator U1 is connected with a first reference voltage, and the first comparator U1 is connected with a first diode D1;
the same-direction end of the second comparator U2 is connected with a second reference voltage, the reverse end of the second comparator U2 is connected with the set protection point of the storage battery, and the second comparator U2 is connected with a second diode D2;
the rear end of the first diode D1 and the rear end of the second diode D2 are connected in parallel and then connected into a rear-stage protection circuit, and when the first diode D1 or the second diode D2 is conducted, the rear-stage protection circuit is used for cutting off the output of the storage battery, otherwise, the storage battery normally outputs;
the storage battery comprises a plurality of single bodies formed by power storage units, the set protection point is located between a first single body group formed by a first plurality of single bodies and a second single body group formed by a second plurality of single bodies, and the first reference voltage is larger than the second reference voltage.
Preferably, a voltage dividing resistor R6 is disposed between the set protection point of the storage battery and the first comparator U1 and the second comparator U2.
Preferably, a capacitor C1 for filtering is provided between the voltage dividing resistor R6 and the set protection point of the storage battery.
Preferably, the single cells of the storage battery are divided into two single cell groups by one set protection point, and the set protection point is connected with a storage battery voltage abnormality protection circuit.
Preferably, the single cells of the storage battery are divided into three single cell groups by two set protection points, and each set protection point is respectively connected with a storage battery voltage abnormality protection circuit.
Preferably, the number of monomers in each monomer group is the same.
The method for quickly judging whether the storage battery is in a charge-discharge state or fails through setting the voltage data of the protection points is realized, the quick positioning of the failure position of the single storage battery is realized, and the maintenance efficiency of the storage battery is improved.
Drawings
Fig. 1 is a schematic diagram of a charger and battery interface of a preferred embodiment of the battery voltage anomaly protection circuit of the present application.
Fig. 2 is a half-voltage abnormality protection circuit of a preferred embodiment of the battery voltage abnormality protection circuit of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the following describes the technical solutions in the embodiments of the present application in more detail with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The application provides a battery voltage anomaly protection circuit, mainly includes:
the same-direction end of the first comparator U1 is connected to a set protection point of the storage battery, the reverse end of the first comparator U1 is connected with a first reference voltage, and the first comparator U1 is connected with a first diode D1;
the same-direction end of the second comparator U2 is connected with a second reference voltage, the reverse end of the second comparator U2 is connected with the set protection point of the storage battery, and the second comparator U2 is connected with a second diode D2;
the rear end of the first diode D1 and the rear end of the second diode D2 are connected in parallel and then connected into a rear-stage protection circuit, and when the first diode D1 or the second diode D2 is conducted, the rear-stage protection circuit is used for cutting off the output of the storage battery, otherwise, the storage battery normally outputs;
the storage battery comprises a plurality of single bodies formed by power storage units, the set protection point is located between a first single body group formed by a first plurality of single bodies and a second single body group formed by a second plurality of single bodies, and the first reference voltage is larger than the second reference voltage.
The abnormality protection circuit is generally arranged on a charger of an aviation storage battery, and voltage protection of the storage battery is achieved through the charger.
In some alternative embodiments, the single cells of the storage battery are divided into two single cell groups by one set protection point, and the set protection point is connected with a storage battery voltage abnormality protection circuit. In some alternative embodiments, the number of monomers within each monomer group is the same, and in alternative embodiments, the number of monomers within each monomer group may be different, and in general, the number difference is not preferably excessive.
Taking the same number of the monomers in each monomer group as an example for explanation, according to the characteristics of the storage battery, respectively setting a protection action point and a recovery point of a half-high voltage circuit of the storage battery and a protection action point and a recovery point of a half-low voltage circuit of the storage battery, and stopping the output of the storage battery when the output voltage of the storage battery exceeds the half-high voltage protection action point or is lower than the half-low voltage protection action point, stopping the output of the storage battery, and recovering the normal output of the storage battery after the voltage of the storage battery reaches the recovery point. The arrangement of the half-voltage detection points can reduce the normal range of output voltages at two ends of the storage battery. If the voltage of the storage battery cannot be recovered to be normal after the half high voltage or the half low voltage of the storage battery occurs, the single fault can be judged, the single abnormality of the storage battery on the side can be determined according to the half voltage and the full voltage of the storage battery, and then the specific fault single position can be determined only by checking the voltage of the single body on the side of the fault, so that the fault positioning time is shortened, and the maintenance efficiency of the storage battery is improved.
Referring to fig. 1, the battery charger protects the battery: and the half-voltage abnormality protection and the temperature protection of the storage battery. The charger has voltage detection, half-voltage detection and temperature detection functions for the storage battery, and controls and protects detection abnormal results, in fig. 1, the storage battery is formed by connecting 20 sections of monomers in series, the rated voltage of the storage battery is 24V, the half-voltage rated point is 12V, the half-voltage protection point of the storage battery half-voltage abnormal protection circuit is set to be 16V according to the protection characteristics of the storage battery and the charger, and the recovery point is set to be 15V; the battery semi-low voltage protection point is 7V, and the recovery voltage is 8V. When the half high voltage is detected to be more than 10V or the half low voltage is detected to be less than 7V, the output voltage of the storage battery is excessively high or excessively low, the charger stops charging, and when the half high voltage is restored to be less than 15V or the half low voltage is restored to be more than 8V, the charger resumes charging.
After the action points of the protection circuit are determined, circuit parameters are calculated and selected according to the principle of a hysteresis comparator, the virtual short and virtual break characteristics of an operational amplifier and relevant engineering experience, and the determined half-voltage detection circuit of the storage battery is shown as a figure 2 and consists of an upper half-half high-voltage abnormal protection circuit and a lower half-low-voltage abnormal protection circuit.
The half high voltage abnormal protection circuit of the upper half part consists of a first comparator U1, resistors R1-R7, a capacitor C1 and a first diode D1, wherein the half high voltage detection circuit selects a scheme of the same-direction input, the reverse end is used as a reference end for input to form a first reference voltage, the high and low thresholds of the half high voltage value are fed back through the resistor voltage division of the same-direction end and then compared with the reverse end, when the half voltage is higher than a half high voltage protection threshold value, the comparator outputs a high level, the first diode D1 is conducted, and the protection circuit cuts off the output of a rear-stage storage battery; when the half voltage is reduced to the half high voltage recovery threshold value, the output of the first comparator U1 is turned to a low level, the first diode D1 is cut off, and the rear-stage storage battery outputs normally.
The semi-low voltage abnormal protection circuit of the lower half part consists of a second comparator U2, resistors R8-R12, a capacitor C2 and a second diode D2, wherein the semi-low voltage detection circuit selects a scheme of reverse input, the same-direction end is used as a reference end for input to form a second reference voltage, the high and low thresholds of the semi-low voltage value are fed back through the resistor voltage division of the reverse end and then compared with the same-direction end, when the semi-voltage is lower than a semi-low voltage protection threshold value, the comparator outputs a high level, the second diode D2 is conducted, and the protection circuit cuts off the output of a later-stage storage battery; when the half voltage rises to the half low voltage recovery threshold value, the output of the second comparator U2 is turned to a low level, the second diode D2 is cut off, and the rear-stage storage battery outputs normally.
In the embodiment, the half-high voltage protection threshold of the storage battery is 16V, and the high voltage recovery threshold is 15V; the semi-low voltage protection threshold of the storage battery is 7V, the recovery threshold is 8V, and the output threshold of the comparator is V0. The half high voltage detection circuit selects the same direction input and the half low voltage detection circuit selects the opposite direction input.
In some alternative embodiments, a voltage dividing resistor R6 is disposed between the set protection point of the storage battery and the first comparator U1 and the second comparator U2. According to the above embodiment, R6 is chosen to be 15 kiloohms.
In some alternative embodiments, a capacitor C1 for filtering is disposed between the voltage dividing resistor R6 and a set protection point of the storage battery. According to the above embodiment, C1 is 100nF.
The specific parameters of the resistors in the above embodiment may be obtained by calculating the given protection threshold and the recovery threshold. The half-voltage detection circuit of the storage battery judges the state of the storage battery through detecting the half-voltage of the storage battery and a hysteresis comparison circuit, when the comparator outputs high level, the half-voltage of the storage battery is excessively high or excessively low, the storage battery is abnormal, and then a voltage abnormality signal is transmitted to the ECU through an OR gate circuit, so that the work of the charger can be stopped.
In addition to dividing the cells of the battery into two groups and using one battery voltage abnormality protection circuit, the battery may be divided into three groups, four groups, or more, for example, in some alternative embodiments, the cells of the battery are divided into three cell groups by two set protection points, where each set protection point is connected to one battery voltage abnormality protection circuit. The number of the monomers in each monomer group in this embodiment may be the same or different, and when the number of the monomers is the same, the circuit forms a 1/3,2/3 voltage detection circuit, and the 1/3,2/3 voltage detection points are respectively connected to the half-voltage input detection points in fig. 2, so that appropriate protection circuit parameters are set.
The protection circuit is applied to the design of the main/APU storage battery charger of the civil aircraft, and experiments show that the scheme can judge whether the storage battery is in a charging and discharging state or fails through half-voltage data, is convenient and quick, can help to quickly locate the single fault position of the storage battery, and improves the maintenance efficiency of the storage battery.
While the application has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that certain modifications and improvements can be made thereto based upon the application. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the invention as claimed.
Claims (6)
1. A battery voltage abnormality protection circuit, characterized by comprising:
the same-direction end of the first comparator U1 is connected to a set protection point of the storage battery, the reverse end of the first comparator U1 is connected with a first reference voltage, and the first comparator U1 is connected with a first diode D1;
the same-direction end of the second comparator U2 is connected with a second reference voltage, the reverse end of the second comparator U2 is connected with the set protection point of the storage battery, and the second comparator U2 is connected with a second diode D2;
the rear end of the first diode D1 and the rear end of the second diode D2 are connected in parallel and then connected into a rear-stage protection circuit, and when the first diode D1 or the second diode D2 is conducted, the rear-stage protection circuit is used for cutting off the output of the storage battery, otherwise, the storage battery normally outputs;
the storage battery comprises a plurality of single bodies formed by power storage units, the set protection point is located between a first single body group formed by a first plurality of single bodies and a second single body group formed by a second plurality of single bodies, and the first reference voltage is larger than the second reference voltage.
2. The battery voltage abnormality protection circuit according to claim 1, wherein a voltage dividing resistor R6 is provided between the set protection point of the battery and the first comparator U1 and the second comparator U2.
3. The battery voltage abnormality protection circuit according to claim 2, wherein a capacitor C1 for filtering is provided between the voltage dividing resistor R6 and a set protection point of the battery.
4. The battery voltage abnormality protection circuit according to claim 1, wherein the cells of the battery are divided into two cell groups by one of the set protection points, the set protection points being connected to one battery voltage abnormality protection circuit.
5. The battery voltage abnormality protection circuit according to claim 1, wherein the cells of the battery are divided into three cell groups by two of the set protection points, each of the set protection points being connected to one battery voltage abnormality protection circuit, respectively.
6. The battery voltage abnormality protection circuit according to claim 4 or 5, wherein the number of cells in each cell group is the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211584911.4A CN116316447A (en) | 2022-12-09 | 2022-12-09 | Abnormal voltage protection circuit for storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211584911.4A CN116316447A (en) | 2022-12-09 | 2022-12-09 | Abnormal voltage protection circuit for storage battery |
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| Publication Number | Publication Date |
|---|---|
| CN116316447A true CN116316447A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211584911.4A Pending CN116316447A (en) | 2022-12-09 | 2022-12-09 | Abnormal voltage protection circuit for storage battery |
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| CN (1) | CN116316447A (en) |
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- 2022-12-09 CN CN202211584911.4A patent/CN116316447A/en active Pending
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