CN213151640U - Battery protection circuit of emergency lighting system - Google Patents
Battery protection circuit of emergency lighting system Download PDFInfo
- Publication number
- CN213151640U CN213151640U CN202022115825.1U CN202022115825U CN213151640U CN 213151640 U CN213151640 U CN 213151640U CN 202022115825 U CN202022115825 U CN 202022115825U CN 213151640 U CN213151640 U CN 213151640U
- Authority
- CN
- China
- Prior art keywords
- resistor
- battery
- voltage
- protection circuit
- stabilizing source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses an emergency lighting system's battery protection circuit connects between battery and lighting load, the positive pole of battery with lighting load's positive pole is connected, and battery protection circuit includes: a discharge switch connected between a negative electrode of the battery and a negative electrode of the lighting load; the voltage division circuit comprises a first diode, a sixth resistor, a seventh resistor, a thermistor and an eighth resistor which are sequentially connected in series between the anode and the grounding end of the battery; the voltage comparison circuit comprises a precision voltage-stabilizing source and is used for comparing the output voltage of the voltage division circuit with the reference voltage of the precision voltage-stabilizing source; and the control module is used for controlling the discharge switch according to the comparison result. The battery protection circuit can keep the same direction with the internal reference temperature deviation of the precise voltage stabilizing source when the battery voltage detection signal is at low temperature and high temperature, so as to eliminate the temperature deviation error, avoid the over-low and continuous discharge of the discharge voltage and prolong the service life of the battery.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to emergency lighting system's battery protection circuit.
Background
With the continuous development of social economy, the construction of engineering buildings in various regions is continuously promoted. Commercial buildings and residential buildings are developed to be multifunctional and intelligent, and high-rise buildings are in super high-rise. The demand for lighting in building corridor passageways and rooms is also constantly increasing, including the demand for building emergency lighting is also rapidly increasing. Modern buildings are mostly complex in internal structure under special circumstances power supply fault condition, and emergency lighting system can provide emergency lighting is essential important component in whole lighting system.
Most energy storage devices in the emergency lighting system configuration are rechargeable batteries. Such as lead acid batteries, lithium batteries. At present, the two commonly used batteries have special use requirements, and the lead-acid battery lithium battery is fully charged with subsequent low current for continuous charging so as to ensure the electric capacity. The voltage across the battery cannot be below its minimum rated voltage when discharged. If the voltage is lower than the voltage, the battery is damaged to a certain extent due to over-discharge, and as a result of multiple cycles, the service cycle of the battery is reduced, and the service life is greatly shortened.
The voltage at two ends of the battery needs to be monitored in real time in the lighting system, and when the voltage is close to the lowest voltage, the battery is immediately turned off to discharge so as to avoid damage to the battery caused by over-discharge of the battery. Most of the current monitoring on the discharge voltage of the battery are hardware circuits, the voltage of the battery is usually subjected to geometric scaling in the hardware circuits and then is compared with a reference voltage source, and a discharge switch of the battery is controlled accordingly, so that the discharge switch is closed when the output voltage of the battery is lower than a threshold value, and the purpose of protecting the battery is achieved.
However, the ambient temperature of the emergency lighting system varies greatly, the reference voltage source is usually implemented by using a semiconductor device, and even if there are band gap voltage stabilization and other technologies, the influence of temperature cannot be completely eliminated. Particularly under high temperature conditions, the voltage of the reference voltage source generally decreases, which may cause the voltage at the time of turning off the discharge switch to be lower than the threshold value of the battery, causing over-discharge of the battery, and affecting the life of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an emergency lighting system's battery protection circuit according to the weak point of above-mentioned prior art, adopt the temperature sensitive feedback voltage to the battery to compensate in this circuit to offset the influence that reference voltage source's voltage temperature characteristic caused.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
a battery protection circuit for an emergency lighting system connected between a battery and a lighting load, an anode of the battery being connected to an anode of the lighting load, the battery protection circuit comprising:
a discharge switch connected between a negative electrode of the battery and a negative electrode of a lighting load;
the voltage division circuit comprises a first diode, a sixth resistor, a seventh resistor, a thermistor and an eighth resistor which are sequentially connected in series between the anode and the grounding end of the battery;
the voltage comparison circuit comprises a precision voltage-stabilizing source and a switching triode; the anode of the precision voltage-stabilizing source is connected with the grounding end, and the cathode of the precision voltage-stabilizing source is connected with the VCC end sequentially through the second resistor and the third resistor which are connected in series; an emitting electrode of the switching triode is connected with the VCC end, and a base electrode of the switching triode is connected with the connection position of the second resistor and the third resistor; the reference end of the precision voltage-stabilizing source is connected with the connection position of the seventh resistor and the thermistor; the reference end of the precision voltage-stabilizing source is connected with the collector electrode of the switching triode through a fourth resistor and is connected with the grounding end through a fifth resistor;
the feedback control input end of the control module is connected with the collector electrode of the switching triode and is connected with the grounding end through a first resistor; the control output end of the feedback control end is connected with the control end of the discharge switch, and the feedback control end is configured to control the discharge switch to be closed when receiving a low level.
The utility model discloses a further improvement lies in, thermistor has negative temperature coefficient.
The utility model is further improved in that the voltage dividing circuit also comprises an electrolytic capacitor; one end of the resistor is connected with the connection position of the sixth resistor and the seventh resistor, and the other end of the resistor is connected with a grounding end.
The utility model discloses a further improvement lies in, still includes power module, its input with the battery positive pole is connected, and its output is connected with VCC end, and be used for to the control module power supply.
The utility model has the advantages that: the battery protection circuit can keep the same direction with the internal reference temperature deviation of the precise voltage stabilization source when the battery voltage is detected at low temperature and high temperature so as to eliminate the temperature deviation error and enable the high-low temperature and normal temperature detection to be consistent, the discharging detection circuit can play an effective discharging protection role for the battery in the high-low temperature environment, the over-low and continuous discharging of the discharging voltage is avoided, and the service life of the battery is prolonged.
Drawings
Fig. 1 is a circuit diagram of a battery protection circuit of an emergency lighting system.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example with reference to the accompanying drawings, for the understanding of those skilled in the art:
example (b): as shown in fig. 1, an embodiment of the present invention includes a battery protection circuit for an emergency lighting system, connected between a battery and a lighting load, the positive terminal of the battery being connected to the positive terminal of the lighting load. The battery protection circuit of the present embodiment specifically includes:
a discharge switch connected between a negative electrode of the battery and a negative electrode of the lighting load; the battery discharges after it is turned on to supply power to the lighting load.
The voltage division circuit comprises a first diode D1, a sixth resistor R6, a seventh resistor R7, a thermistor TH1 and an eighth resistor R8 which are sequentially connected in series between the positive electrode of the battery and the ground end GND; the voltage division circuit also comprises an electrolytic capacitor C1; one end of the resistor is connected to the connection point of the sixth resistor R6 and the seventh resistor R7, and the other end is connected to the ground GND.
The voltage comparison circuit comprises a precision voltage regulator U1 and a switching transistor Q1. The anode A of the precision voltage-stabilizing source U1 is connected with the grounding end, and the cathode K of the precision voltage-stabilizing source U1 is connected with the VCC end through the second resistor R2 and the third resistor R3 which are connected in series in sequence. The emitter of the switching transistor Q1 is connected to the VCC terminal, and the base thereof is connected to the connection point of the second resistor R2 and the third resistor R3. The reference end of the precise voltage stabilizing source U1 is connected with the connection position of the seventh resistor R7 and the thermistor TH 1. A reference end R of the precision voltage-stabilizing source U1 is connected with a collector of a switching triode Q1 through a fourth resistor R4 and is connected with a ground end GND through a fifth resistor R5;
the feedback control input end of the control module is connected with the collector electrode of the switching triode Q1 and is connected with the ground end through a first resistor R1; the control output end of the control circuit is connected with the control end of the discharge switch, and the control circuit is configured to control the discharge switch to be closed when the feedback control end receives a low level.
In this embodiment, the precision voltage regulator U1 is of type AZ431, and has a reference voltage source inside, and when the voltage of the reference terminal R is greater than the reference voltage source, the cathode K and the anode a are turned on, whereas the cathode K and the anode a are turned off.
In this embodiment, the thermistor TH1 has a negative temperature coefficient. When the temperature rises, the resistance thereof decreases so that the voltage applied to the reference terminal R decreases; when the temperature decreases, the resistance thereof increases so that the voltage applied to the reference terminal R increases. The reference terminal R keeps the same trend with the reference voltage source in the precise voltage stabilizing source along with the change of the temperature through the compensation of the thermistor TH 1. The temperature characteristic of the thermistor is made to sufficiently cancel the temperature drift of the reference voltage source by the selection of the respective resistors and the thermistor TH 1.
The battery protection circuit of the emergency lighting system of this embodiment further includes a power supply module, an input terminal of which is connected to the positive electrode of the battery, and an output terminal of which is connected to the VCC terminal, and is configured to supply power to the control module. In this embodiment, the control module is implemented by using an MCU.
When the reference voltage in the precise voltage-stabilizing source U1 is shifted upwards under the low-temperature condition, the resistance value of a thermistor TH1 in an external compensation circuit is increased at the low temperature, the total resistance value of the series-parallel connection of TH1, R8 and R5 is also increased, at this time, the voltage of a reference end R of the precise voltage-stabilizing source U1 is also increased, the voltage is synchronously increased with the reference voltage in the precise voltage-stabilizing source U1, and the difference value of the reference voltage and the reference voltage in the precise voltage-stabilizing source U1 is kept relatively unchanged. When the voltage signal of the battery is detected to be lower than the internal reference voltage, the voltage of the K end of the cathode of the precision voltage-stabilizing source U1 immediately rises to a high level, the Q1 triode is switched from on to off, meanwhile, the signal of the feedback control input end is switched from the high level to the low level, and the signal of the control output end controls the discharge switch to turn off the battery to supply power for illumination, so that the overdischarge of the battery is avoided.
When the internal reference voltage of the precision voltage regulator U1 is shifted downwards under the high-temperature condition, the resistance value of a thermistor TH1 in an external compensation circuit at high temperature is reduced, the total resistance value of the series-parallel connection of TH1, R8 and R5 is also reduced, the voltage of the U1R end of the precision voltage regulator is also reduced, the voltage is reduced synchronously with the internal reference voltage of the precision voltage regulator U1, and the difference value of the voltage and the internal reference voltage of the precision voltage regulator U1 is kept relatively unchanged. When the voltage signal of the battery is detected to be lower than the internal reference voltage, the voltage of the K end of the cathode of the precision voltage-stabilizing source U1 immediately rises to a high level, the Q1 triode is switched from on to off, meanwhile, the signal of the feedback control input end is switched from the high level to the low level, and the signal of the control output end controls the discharge switch to turn off the battery to supply power for illumination, so that the over-discharge of the battery is avoided.
The battery protection circuit of the embodiment can keep the same direction with the internal reference offset of the precision voltage stabilization source U1 when the battery voltage is detected at low temperature and high temperature so as to eliminate offset error and enable the detection at high and low temperature and normal temperature to be consistent, the discharging detection circuit can play an effective discharging protection role for the battery under the high and low temperature environment, the over-low and continuous discharging of the discharging voltage is avoided, and the service life of the battery is prolonged.
The above embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A battery protection circuit for an emergency lighting system, connected between a battery and a lighting load, an anode of the battery being connected to an anode of the lighting load, the battery protection circuit comprising:
a discharge switch connected between a negative electrode of the battery and a negative electrode of a lighting load;
the voltage division circuit comprises a first diode, a sixth resistor, a seventh resistor, a thermistor and an eighth resistor which are sequentially connected in series between the anode and the grounding end of the battery;
the voltage comparison circuit comprises a precision voltage-stabilizing source and a switching triode; the anode of the precision voltage-stabilizing source is connected with the grounding end, and the cathode of the precision voltage-stabilizing source is connected with the VCC end sequentially through the second resistor and the third resistor which are connected in series; an emitting electrode of the switching triode is connected with the VCC end, and a base electrode of the switching triode is connected with the connection position of the second resistor and the third resistor; the reference end of the precision voltage-stabilizing source is connected with the connection position of the seventh resistor and the thermistor; the reference end of the precision voltage-stabilizing source is connected with the collector electrode of the switching triode through a fourth resistor and is connected with the grounding end through a fifth resistor;
the feedback control input end of the control module is connected with the collector electrode of the switching triode and is connected with the grounding end through a first resistor; the control output end of the feedback control end is connected with the control end of the discharge switch, and the feedback control end is configured to control the discharge switch to be closed when receiving a low level.
2. The battery protection circuit of an emergency lighting system of claim 1, wherein said thermistor has a negative temperature coefficient.
3. The battery protection circuit of claim 1, wherein the voltage divider circuit further comprises an electrolytic capacitor; one end of the resistor is connected with the connection position of the sixth resistor and the seventh resistor, and the other end of the resistor is connected with a grounding end.
4. The battery protection circuit of claim 1, further comprising a power supply module having an input terminal connected to the positive electrode of the battery and an output terminal connected to the VCC terminal, and configured to supply power to the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022115825.1U CN213151640U (en) | 2020-09-24 | 2020-09-24 | Battery protection circuit of emergency lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022115825.1U CN213151640U (en) | 2020-09-24 | 2020-09-24 | Battery protection circuit of emergency lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213151640U true CN213151640U (en) | 2021-05-07 |
Family
ID=75718820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022115825.1U Active CN213151640U (en) | 2020-09-24 | 2020-09-24 | Battery protection circuit of emergency lighting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213151640U (en) |
-
2020
- 2020-09-24 CN CN202022115825.1U patent/CN213151640U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20170170653A1 (en) | Explosion-proof circuit, charging circuit and charging/discharging protection circuit of battery | |
| US11925213B2 (en) | Output control circuit | |
| CN107979123B (en) | Power supply self-adaptive lithium battery charging management circuit | |
| CN104779589A (en) | Battery protection circuit and system | |
| CN108565907B (en) | Charging and discharging control method, device, equipment and system | |
| CN214255774U (en) | Battery charging dormancy control circuit | |
| CN213151640U (en) | Battery protection circuit of emergency lighting system | |
| CN103107520B (en) | Lithium ion battery overheat protector system and method | |
| CN102545163A (en) | Battery discharge protection circuit and LED (Light Emitting Diode) lamp | |
| CN219960142U (en) | Battery protection circuit, battery protection system and electronic equipment | |
| CN104184128A (en) | Battery discharge protection method and circuit and lamp thereof | |
| EP4138262A2 (en) | Dc/dc converter | |
| CN208589807U (en) | A kind of solar controller and solar energy system | |
| CN210016273U (en) | Battery pack under-voltage protection circuit with hysteresis | |
| CN110071552B (en) | Battery charging management circuit | |
| CN211351687U (en) | Overvoltage protection circuit, charging equipment and electronic equipment | |
| CN113141034B (en) | Battery charging control circuit and battery protection system | |
| CN111800919B (en) | Bridge detection illumination and charging dual-mode charging lamp | |
| CN112994186A (en) | Power supply circuit and control method of power supply circuit | |
| CN103779839B (en) | A kind of automatic shutoff start-up circuit adopting rechargeable battery to power | |
| CN108832700B (en) | Wake-up and dormancy circuit of Hall switch | |
| CN109217655B (en) | Power supply capable of prolonging maintenance time after power failure | |
| CN110912086A (en) | Reverse connection prevention protection circuit of storage battery charger | |
| CN220673428U (en) | Automatic control early warning protection circuit and device for undervoltage surge and low voltage | |
| CN221688303U (en) | Pre-charging circuit and electronic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |