CN211744085U - Protection circuit and power supply - Google Patents
Protection circuit and power supply Download PDFInfo
- Publication number
- CN211744085U CN211744085U CN202020508585.9U CN202020508585U CN211744085U CN 211744085 U CN211744085 U CN 211744085U CN 202020508585 U CN202020508585 U CN 202020508585U CN 211744085 U CN211744085 U CN 211744085U
- Authority
- CN
- China
- Prior art keywords
- circuit
- protection circuit
- voltage
- battery
- output
- 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
- Secondary Cells (AREA)
Abstract
The embodiment of the utility model provides a relate to electron electric power technical field, disclose a protection circuit, including being connected to the anodal positive input of group battery, being connected to group battery negative pole negative input, being connected to power or the anodal output of load and negative output, the group battery includes at least one electric core, and this protection circuit still includes: a simulation front end for obtaining the coulometer of group battery voltage, connect the switch circuit between positive input and positive output, connect the current detection circuit between negative input and negative output, and be connected with current detection circuit and switch circuit respectively, this simulation front end is higher than predetermineeing the threshold value at the electric core voltage that detects, perhaps when the electric current that detects is not predetermineeing the within range, exports low level signal control switch circuit disconnection, the utility model provides a protection circuit can the residual capacity of accurate measurement group battery, and the security is higher.
Description
Technical Field
The embodiment of the utility model provides a relate to electron electric power technical field, in particular to protection circuit and power.
Background
At present, along with unmanned aerial vehicle in the rise of each trade, like in the intelligent monitoring task of the execution in the agricultural, also bigger and bigger to unmanned aerial vehicle's power and continuation of the journey demand, and the promotion of power and continuation of the journey, it also needs corresponding increase to mean that the electric core quantity in the group battery among the unmanned aerial vehicle also needs, this potential safety hazard that can greatly increased unmanned aerial vehicle, consequently, it is very important to set up the security when protection circuit charges and discharges with protection electric core between group battery and unmanned aerial vehicle's motor.
In implementing the embodiments of the present invention, the inventor finds that there are at least the following problems in the above related art: at present, in the battery management scheme for setting up protection circuit between group battery and motor in order to improve system security, when electric core quantity in the group battery improves, the harsh battery power precision and the higher security requirement of unmanned aerial vehicle can't be satisfied in most.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect of prior art, the embodiment of the utility model provides a protection circuit and power of high electric quantity precision, security height are provided.
The embodiment of the utility model provides an aim at is realized through following technical scheme:
in order to solve the above technical problem, in a first aspect, the embodiment of the present invention provides a protection circuit, including positive input end, negative input end, positive output end and negative output end, the positive input end is used for being connected to the group battery positive pole, the negative input end is used for being connected to the group battery negative pole, the positive output end with the negative output end is used for being connected to load or group battery charging source, the group battery includes at least one electric core, protection circuit includes:
the fuel gauge comprises a battery voltage detection end for acquiring the voltage of the battery pack;
the input end of the switch circuit is connected with the anode input end, and the output end of the switch circuit is connected with the anode output end;
the input end of the current detection circuit is connected with the negative electrode input end, and the output end of the current detection circuit is connected with the negative electrode output end;
the analog front end comprises at least one voltage detection end, each voltage detection end is connected to the positive electrode of one battery cell, the current detection end of the voltage detection end is connected with the current detection circuit, the output end of the current detection end is connected with the control end of the switch circuit, and the analog front end is used for outputting a low-level signal when the detected voltage of the battery cell is higher than a preset threshold value or the detected current is not in a preset range.
In some embodiments, the protection circuit further comprises: a microprocessor, comprising:
a fuel gauge communication port connected with a communication port of the fuel gauge;
an analog front end communication port connected with a communication port of the analog front end;
an external communication port for communicating with an external device.
In some embodiments, the protection circuit further comprises:
and the input end of the linear voltage stabilizer is connected with the battery pack, and the output end of the linear voltage stabilizer is connected with the power supply input end of the electricity meter.
In some embodiments, the protection circuit further comprises:
and the input end of the voltage division circuit is connected with the battery pack, and the output end of the voltage division circuit is connected with the battery voltage detection end of the electricity meter.
In some embodiments, the voltage divider circuit includes:
one end of the first resistor is an input end of the voltage division circuit, and the other end of the first resistor is an output end of the voltage division circuit;
and one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
In some embodiments, the protection circuit further comprises:
and a temperature detection circuit connected to a temperature detection terminal of the fuel gauge and configured to measure a temperature of the battery pack.
In some embodiments, the temperature detection circuit comprises:
and the input end of the temperature sensor is connected with the temperature detection end of the electricity meter, the output end of the temperature sensor is grounded, and the temperature sensor is arranged in the battery pack.
In some embodiments, the switching circuit comprises:
a first switch tube, wherein the source electrode of the first switch tube is connected with the positive input end, and the grid electrode of the first switch tube is connected with the output end of the analog front end;
and the source electrode of the second switch tube is connected with the anode output end, the grid electrode of the second switch tube is connected with the output end of the analog front end, and the drain electrode of the second switch tube is connected with the drain electrode of the first switch tube.
In some embodiments, the current detection circuit comprises:
and the current sampling resistor is respectively connected to the current detection end of the analog front end and the current detection end of the fuel gauge in parallel, and the current sampling resistor is connected between the negative electrode input end and the negative electrode output end.
In order to solve the above technical problem, in a second aspect, the embodiment of the present invention provides a power supply, including: the battery pack and the protection circuit according to the first aspect described above are electrically connected, and the battery pack outputs a stable power supply voltage through the protection circuit, or the battery pack is charged through the protection circuit.
Compared with the prior art, the beneficial effects of the utility model are that: be different from prior art's condition, the embodiment of the utility model provides a protection circuit is provided, including being connected to the anodal positive input of group battery, being connected to group battery negative pole input, being connected to power or load positive output and negative output, the group battery includes at least one electric core, and this protection circuit still includes: a simulation front end for obtaining the coulometer of group battery voltage, connect the switch circuit between positive input and positive output, connect the current detection circuit between negative input and negative output, and be connected with current detection circuit and switch circuit respectively, this simulation front end is higher than predetermineeing the threshold value at the electric core voltage that detects, perhaps when the electric current that detects is not predetermineeing the within range, exports low level signal control switch circuit disconnection, the utility model provides a protection circuit can the residual capacity of accurate measurement group battery, and the security is higher.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic block diagram of a protection circuit provided in a first embodiment of the present invention;
fig. 2 is a schematic block diagram of another protection circuit provided in the first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a protection circuit according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power supply provided in the second embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention can be combined with each other and are within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a protection circuit, this protection circuit can use in unmanned aerial vehicle's power module, and this protection circuit can protect electric core when the group battery charges, also can accurately acquire the electric quantity of group battery when the group battery supplies power for the load to the protection load. Wherein, the embodiment of the utility model provides an adopt the voltage of the well electric core of analog front end (AFE, analog front-end) detection group battery, combine the electric current that the current detection flowed through the group battery to combine switch circuit, cut off group battery and load or group battery charging source's connection when excessive pressure overflows, realize safety protection, just the embodiment of the utility model provides an adopt the electric quantity of the unified measurement group battery of coulometer, realize that the high accuracy of electric quantity acquires.
Specifically, the embodiments of the present invention will be further explained with reference to the drawings.
Example one
An embodiment of the present invention provides a protection circuit, please refer to fig. 1, which shows a schematic block diagram of a protection circuit provided by an embodiment of the present invention, the protection circuit 100 includes: positive input terminal BAT +, negative input terminal BAT-, positive output terminal PACK + and negative output terminal PACK-, the positive input terminal BAT + is used for being connected to the positive pole of battery B, the negative input terminal BAT-is used for being connected to the negative pole of battery B, the positive output terminal PACK + and the negative output terminal PACK-are used for being connected to a load or a battery charging power supply, the battery B includes at least one electric core, the protection circuit 100 further includes: a fuel gauge U1, a switching circuit 110, a current sensing circuit 120, and an analog front end U3.
The protection circuit 100 may be applied to various products or electronic devices provided with a power source or a battery, for example, an aircraft, an automobile, a terminal device (e.g., a mobile phone, a tablet, a wearable device), a household appliance device (e.g., an air conditioner, a refrigerator), and the like, so as to improve the cruising ability of the various products or electronic devices and ensure the safety of the products or electronic devices during charging and discharging.
The protection circuit 100 provided by the embodiment of the present invention is specifically described below with the battery B as an electric energy source.
The fuel gauge U1 includes a battery voltage detection terminal BAT _ SNS for acquiring the battery pack voltage. The electricity meter U1 can acquire the electricity quantity information of the battery B, specifically, measure the voltage of the battery, and acquire accurate electricity quantity information in combination with the correspondence between the battery voltage and the battery capacity. The electricity meter U1 can also communicate with an external device to output the information of the amount of electricity of the battery B.
In the embodiment of the present invention, the electricity meter U1 may be a coulometer, a hoffman electricity meter, a silver electricity meter, a gas electricity meter, etc. commonly available in the market. For example, in the embodiment of the present invention, a power management chip with a chip model number BQ27Z561 may be adopted as the electricity meter. In other embodiments, the specific model of the fuel gauge U1, the specific connection mode with other modules, the setting of the threshold value of the low battery voltage signal, and the like can be set according to actual needs, and need not be restricted to the embodiments of the present invention.
The input end of the switch circuit 110 is connected with the positive input end BAT +, and the output end of the switch circuit 110 is connected with the positive output end PACK +. The switching circuit 110 is turned off when receiving a low level and turned on when receiving a high level. Preferably, the embodiment of the utility model provides a can adopt the MOS pipe to construct switching circuit 110, it has that input impedance is little, drive power is little, switching speed is fast, can not secondary puncture advantages such as, can realize opening when receiving the high level, can turn-off rapidly when receiving the low level for the system falls the electricity fast, avoids refluence damage circuit and module, plays the effect that can keep apart circuit and module around.
The input end of the current detection circuit 120 is connected with the negative input end BAT-, and the output end of the current detection circuit 120 is connected with the negative output end PACK-. The current detection circuit 120 is used for detecting the charging and discharging current of the system.
The analog front end U3 includes at least one voltage detection terminal CELL, each voltage detection terminal CELL is connected to the positive electrode of one of the battery CELLs, the current detection terminal ISM/ISP of the analog front end U3 is connected to the current detection circuit 120, the output terminal CHG/DSG of the analog front end U3 is connected to the control terminal of the switch circuit 110, and the analog front end U3 is configured to output a low level signal when the detected battery CELL voltage is higher than a preset threshold value or the detected current is not within a preset range. The preset threshold and the preset range are stored in a storage module in the analog front end U3; alternatively, the analog front end U3 may be in communication connection with the outside to obtain a control command including the preset threshold and the preset range.
The embodiment of the present invention provides an Analog Front End U3(Analog Front-End, AFE), can realize the detection of voltage and current, and can digitize and analyze the detected data, Analog Front End U3 can also carry out two-way data communication with modules such as external device or microprocessor to acquire control command, output data information. In other some embodiments, the specific model of simulation front end U3, with the concrete connected mode of other modules, predetermine the threshold value and the setting of predetermineeing the scope etc. can set up according to actual need, need not be restricted to the utility model discloses the injecing of embodiment.
When the battery pack B discharges through the protection circuit 100 and provides electric energy for a load, the electricity meter U1 detects and acquires the electric quantity information of the battery pack B in real time, the analog front end U3 monitors the voltage of each electric core in the battery pack B through the voltage detection end CELL, and simultaneously monitors the discharge current of the battery pack B through the current detection circuit 120, and when the voltage of the electric core is higher than a preset threshold value set by a system, or when the discharge current is not detected in a preset range, such as short circuit, overcurrent, over-discharge and the like of the system, the analog front end U3 outputs a low level signal to control the switch circuit 110 to be turned off and stop discharging.
When a battery pack charging power supply charges the battery pack B through the protection circuit 100, the electricity meter U1 detects and acquires the electricity quantity information of the battery pack B in real time, the simulation front end U3 monitors the voltage of each electric core in the battery pack B through a voltage detection end CELL, meanwhile, the current detection circuit 120 monitors the charging current of the battery pack B, and when the voltage of the electric core is higher than a preset threshold value set by a system, or when the discharging current is detected not in a preset range, such as short circuit, overcurrent and overcharge of the system, the simulation front end U3 outputs a low level signal to control the switch circuit 110 to be closed and stop charging.
In some embodiments, please refer to fig. 2, which shows a schematic block diagram of another protection circuit provided in an embodiment of the present invention, based on the protection circuit 100 shown in fig. 1 and the embodiment thereof, the protection circuit 100 further includes: microprocessor U2, linear regulator U4, voltage divider circuit 130, and temperature detection circuit 140.
The microprocessor U2 includes: a fuel gauge communication port IO1, an analog front end communication port IO2, and an external communication port IO 4. Wherein the electricity meter communication port IO1 is connected with the communication port HDQ/I2C of the electricity meter U1. The analog front end communication port IO2 is connected with the communication port DATA of the analog front end U3. The external communication port IO4 is used for communicating with an external device. The microprocessor U2 can receive a control command issued by an external device, convert the control command into a control signal, and send the control signal to the fuel gauge U1 or the analog front end U3, so that the fuel gauge U1 or the analog front end U3 executes a corresponding task. The microprocessor U2 can also obtain the power data uploaded by the power meter U1 and send the power data to an external device. The communication ports of the microprocessor U2 can be connected by I2C bus, serial port, wireless or other communication modes.
At least one microprocessor or microcomputer with computing power needs to be provided in the microprocessor U2. The microprocessor or microcomputer may be a plurality of microprocessors or microcomputers having a calculation function provided in each module in the protection circuit 100, or may be an independently provided microprocessor or microcomputer, and the microprocessor or microcomputer is connected to at least the electricity meter U1 and the analog front end U3, thereby controlling the analog front end U3 and performing bidirectional data transmission with the electricity meter U1. The microprocessor or microcomputer can be used to set various parameters, obtain various parameters, store various parameters, receive various information, process various information, and send various information and instructions. The microprocessor U2 also has a storage medium disposed therein, which stores a plurality of executable instructions and programs for data processing by the microprocessor U2. The microprocessor U2 may also be a small single-chip microcomputer. In other embodiments, the specific type of the microprocessor or the microcomputer in the microprocessor U2 may be set according to the actual requirement of the microprocessor U2 for data processing capability, and the specific circuit structure in the microprocessor U2 may be set according to the actual requirement, which is not limited by the embodiments of the present invention.
The input end of the linear voltage regulator U4 is used for being connected with the battery pack B, and the output end of the linear voltage regulator U4 is connected with the power supply input end BAT of the fuel gauge U1. The linear voltage regulator U4 modulates the voltage output by the battery B and outputs a stable supply voltage to provide electric energy for the electricity meter U1. Further, the regulated supply voltage output by the linear regulator U4 can also be used to power a load. The linear regulator U4 is a type of integrated circuit regulator that uses transistors or FETs operating in its linear region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. The embodiment of the utility model provides an in, can adopt Low dropout linear regulator, LDO power (Low linear regulator), in practical application, linear regulator U4's chip model can set up according to actual need, need not be restricted in the utility model discloses the injecing of embodiment.
The input end of the voltage dividing circuit 130 is used for being connected with the battery pack B, and the output end thereof is connected with the battery voltage detection terminal BAT _ SNS of the electricity meter U1. When the voltage drop of the battery pack B acquired by the electricity meter U1 through the voltage dividing circuit 130 is used to calculate the remaining capacity of the battery pack B, more accurate data can be obtained.
The temperature detection circuit 140 is connected to a temperature detection terminal TS of the fuel gauge U1, and is configured to measure the temperature of the battery B. The fuel gauge U1 can also determine whether the battery B is currently in a normal charging/discharging condition according to the temperature of the battery B measured by the temperature detection circuit 140.
In some embodiments, please refer to fig. 3, which illustrates a circuit structure of the protection circuit 100 provided by the embodiment of the present invention, based on the protection circuit 100 shown in fig. 1 and fig. 2 and the embodiment thereof, the circuit structure and the electrical connection relationship of the protection circuit 100 are as follows:
the switching circuit 110 includes: a first switch tube Q1 and a second switch tube Q2. The source S of the first switch Q1 is connected to the positive input terminal BAT +, and the gate G thereof is connected to the output terminal CHG of the analog front end U3. The source S of the second switch Q2 is connected to the positive output terminal PACK +, the gate G thereof is connected to the output terminal DSG of the analog front end U3, and the drain D thereof is connected to the drain D of the first switch Q1. The first switch tube Q1 and the second switch tube Q2 are NMOS tubes.
The current detection circuit 120 includes: and the current sampling resistor SENSE is respectively connected to the current detection end ISM/ISP of the analog front end U3 and the current detection end SRN/SRP of the fuel gauge U1 in parallel, and is connected between the negative electrode input end BAT-and the negative electrode output end PACK-.
In the embodiment of the present invention, the analog front end U3 is provided with a plurality of voltage detection ports (CELLX, CELL1, CELL0, … …), and two adjacent voltage detection ports are connected in parallel at two ends of a battery CELL of a battery pack. The battery CELLs of the battery pack B are connected in series one by one, wherein CELL2, CELL3 and the like represent the battery CELLs of the battery pack B, CELL2 represents the second battery CELL, CELL3 represents the third battery CELL, and so on. The analog front end U3 is used for detecting the voltage of each battery cell, detecting overcurrent and short-circuit protection, and controlling the on-off of an MOS tube during charging and discharging.
The voltage dividing circuit 130 includes: a first resistor R1 and a second resistor R2. One end of the first resistor R1 is an input end of the voltage divider circuit 130, and the other end of the first resistor R1 is an output end of the voltage divider circuit 130. One end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded.
In the embodiment of the utility model, the fuel gauge U1 is through the voltage drop that acquires first resistance R1 both ends, and the current size that the combination detected through current sampling resistance SENSE carries out the integral operation back, can obtain the residual capacity of group battery. It should be noted that, in the embodiment of the present invention, preferably, the voltage provided by the power input terminal BAT of the electricity meter U1 needs to be higher than the voltage drop detected by the battery voltage detection terminal BAT _ SNS by about 0.7, so as to avoid the voltage value of the battery pack collected from being deviated to some extent, and thus, the battery pack electricity quantity data obtained by calculating the electricity meter U1 has an error.
The temperature detection circuit 140 includes: temperature sensor RT1, temperature sensor RT 1's input with the temperature detection end TS of fuel gauge U1 is connected, temperature sensor RT 1's output ground connection, just temperature sensor RT1 be used for setting up the inside of group battery B.
Furthermore, in the embodiment of the present invention, the microprocessor U2 also obtains power through the VSYS port, and the VSYS port provides a stable 3.3V working voltage for the microprocessor U2. In some embodiments, the microprocessor U2 may also be connected to the output of the linear regulator U4, and the linear regulator U4 may provide a stable operating voltage for the microprocessor U2.
In other embodiments, the first switch tube Q1, the second switch tube Q2, the first resistor R1, the second resistor R2, the temperature sensor RT1, the current sampling resistor SENSE, the fuel gauge U1, the analog front end U3, the microprocessor U2, the model, the value size, the initialization setting, and the like of the linear regulator U4 may be set according to actual conditions, and need not be limited by the embodiments of the present invention.
Example two
The embodiment of the present invention provides a power supply, please refer to fig. 4, which shows a circuit structure of the power supply provided by the embodiment of the present invention, the power supply 200 includes: the battery pack B is electrically connected to the protection circuit 100, and the battery pack B outputs a stable power voltage through the protection circuit 100, or the battery pack B is charged through the protection circuit 100.
The power supply 200 may be applied to various products or electronic devices provided with a power supply or a battery, for example, an aircraft, an automobile, a terminal device (such as a mobile phone, a tablet, a wearable device), a household appliance device (such as an air conditioner, a refrigerator), and the like, so as to ensure that the various products or electronic devices have high cruising ability and ensure safety of the power supply during charging and discharging.
It should be noted that, since the protection circuit 100 in the present embodiment is based on the same concept as the protection circuit 100 provided in the first embodiment, the corresponding content of the protection circuit 100 in the first embodiment is also applicable to the corresponding content of the protection circuit 100 in the present embodiment, and is not described in detail here.
The battery B may be any type of battery, such as a lithium battery, a cadmium nickel battery, a nickel metal hydride battery, a lead acid battery, and the like. And the battery pack B is formed by connecting a plurality of single batteries (electric cores) in series. The battery pack B is formed by connecting a plurality of single batteries in series so as to meet the power supply requirements of various electric equipment, and preferably, 8 or more than 8 battery cores are connected in series so as to meet the power supply requirement of high endurance.
The embodiment of the utility model provides an in, group battery B is as the electric energy source, through protection circuit 100 back for the load with each power module power supply in the protection circuit 100, group battery charging source also can pass through protection circuit 100 does group battery B charges. In other some embodiments, the model, the electric quantity, the quantity, etc. of group battery B can set up according to actual conditions, need not be restricted to the utility model discloses the injeciton.
The embodiment of the utility model provides a protection circuit, including being connected to the anodal positive input of group battery, being connected to group battery negative pole negative input, being connected to power or the anodal output of load and negative output, the group battery includes at least one electric core, and this protection circuit still includes: a simulation front end for obtaining the coulometer of group battery voltage, connect the switch circuit between positive input and positive output, connect the current detection circuit between negative input and negative output, and be connected with current detection circuit and switch circuit respectively, this simulation front end is higher than predetermineeing the threshold value at the electric core voltage that detects, perhaps when the electric current that detects is not predetermineeing the within range, exports low level signal control switch circuit disconnection, the utility model provides a protection circuit can the residual capacity of accurate measurement group battery, and the security is higher.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a protection circuit, includes anodal input, negative pole input, anodal output and negative output, anodal input is used for being connected to the group battery anodal, the negative pole input is used for being connected to the group battery negative pole, anodal output with the negative pole output is used for being connected to load or group battery charging source, the group battery includes at least one electric core, its characterized in that, protection circuit includes:
the fuel gauge comprises a battery voltage detection end for acquiring the voltage of the battery pack;
the input end of the switch circuit is connected with the anode input end, and the output end of the switch circuit is connected with the anode output end;
the input end of the current detection circuit is connected with the negative electrode input end, and the output end of the current detection circuit is connected with the negative electrode output end;
the analog front end comprises at least one voltage detection end, each voltage detection end is connected to the positive electrode of one battery cell, the current detection end of the voltage detection end is connected with the current detection circuit, the output end of the current detection end is connected with the control end of the switch circuit, and the analog front end is used for outputting a low-level signal when the detected voltage of the battery cell is higher than a preset threshold value or the detected current is not in a preset range.
2. The protection circuit of claim 1, further comprising: a microprocessor, comprising:
a fuel gauge communication port connected with a communication port of the fuel gauge;
an analog front end communication port connected with a communication port of the analog front end;
an external communication port for communicating with an external device.
3. The protection circuit of claim 2, further comprising:
and the input end of the linear voltage stabilizer is connected with the battery pack, and the output end of the linear voltage stabilizer is connected with the power supply input end of the electricity meter.
4. The protection circuit of claim 3, further comprising:
and the input end of the voltage division circuit is connected with the battery pack, and the output end of the voltage division circuit is connected with the battery voltage detection end of the electricity meter.
5. The protection circuit according to claim 4, wherein the voltage dividing circuit includes:
one end of the first resistor is an input end of the voltage division circuit, and the other end of the first resistor is an output end of the voltage division circuit;
and one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
6. The protection circuit of claim 4, further comprising:
and a temperature detection circuit connected to a temperature detection terminal of the fuel gauge and configured to measure a temperature of the battery pack.
7. The protection circuit of claim 6, wherein the temperature detection circuit comprises:
and the input end of the temperature sensor is connected with the temperature detection end of the electricity meter, the output end of the temperature sensor is grounded, and the temperature sensor is arranged in the battery pack.
8. The protection circuit of claim 1, wherein the switching circuit comprises:
a first switch tube, wherein the source electrode of the first switch tube is connected with the positive input end, and the grid electrode of the first switch tube is connected with the output end of the analog front end;
and the source electrode of the second switch tube is connected with the anode output end, the grid electrode of the second switch tube is connected with the output end of the analog front end, and the drain electrode of the second switch tube is connected with the drain electrode of the first switch tube.
9. The protection circuit of claim 1, wherein the current detection circuit comprises:
and the current sampling resistor is respectively connected to the current detection end of the analog front end and the current detection end of the fuel gauge in parallel, and the current sampling resistor is connected between the negative electrode input end and the negative electrode output end.
10. A power supply, comprising: a battery pack and a protection circuit as claimed in any one of claims 1 to 9, the battery pack and the protection circuit being electrically connected, the battery pack outputting a stable supply voltage through the protection circuit, or the battery pack being charged through the protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020508585.9U CN211744085U (en) | 2020-04-08 | 2020-04-08 | Protection circuit and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020508585.9U CN211744085U (en) | 2020-04-08 | 2020-04-08 | Protection circuit and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211744085U true CN211744085U (en) | 2020-10-23 |
Family
ID=72854806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020508585.9U Active CN211744085U (en) | 2020-04-08 | 2020-04-08 | Protection circuit and power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211744085U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866658A (en) * | 2021-12-01 | 2021-12-31 | 荣耀终端有限公司 | Electric quantity information acquisition circuit and equipment |
-
2020
- 2020-04-08 CN CN202020508585.9U patent/CN211744085U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866658A (en) * | 2021-12-01 | 2021-12-31 | 荣耀终端有限公司 | Electric quantity information acquisition circuit and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10044211B2 (en) | Battery pack and method of controlling the same | |
| CN105429226B (en) | Large capacity charge-discharge battery manages system | |
| CN103499794A (en) | Method and device for evaluating state of charge (SOC) of energy storage battery | |
| CN201839036U (en) | Lithium-powered battery pack management system | |
| CN107634277A (en) | A kind of automobile high in the clouds battery management system based on wireless telecommunications battery core | |
| US11831716B2 (en) | System and method for communication between BMSs | |
| EP3667343A1 (en) | Voltage measurement device and method | |
| CN111483350A (en) | Balance and micro-short circuit detection method for power battery pack | |
| CN207753126U (en) | A kind of lithium battery management system | |
| CN103171451B (en) | Battery management system based on co-processor and solid-state relay | |
| CN205304339U (en) | Intelligence lithium battery management system device based on BQ7694003 analog front end | |
| CN202395113U (en) | Intelligent battery unit | |
| CN113300005B (en) | Electric quantity detection device and method and electronic equipment | |
| CN113103922A (en) | Battery management system | |
| CN202488114U (en) | Intelligent lithium battery guard plate | |
| CN211744085U (en) | Protection circuit and power supply | |
| CN110571487A (en) | battery and automobile diagnosis panel | |
| CN203151186U (en) | Intelligent charging and discharging system for lithium battery and computer | |
| CN207199787U (en) | A kind of automobile high in the clouds battery management system based on wireless telecommunications battery core | |
| CN203241519U (en) | Voltage measurement circuit for single cells of lithium-ion power batteries | |
| CN106571496B (en) | Scalable modularization power battery system | |
| CN215322099U (en) | Battery management system | |
| CN210744088U (en) | Battery and automobile diagnosis panel | |
| CN111077459A (en) | Car as a house power monitoring management system | |
| CN108054450A (en) | A kind of lithium battery management system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili Street Xueyuan Road No. 1001 Chi Yuen Building 9 layer B1 Patentee after: Shenzhen daotong intelligent Aviation Technology Co.,Ltd. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Street Xueyuan Road No. 1001 Chi Yuen Building 9 layer B1 Patentee before: AUTEL ROBOTICS Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |