CN210490446U - Power protection circuit and power - Google Patents
Power protection circuit and power Download PDFInfo
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- CN210490446U CN210490446U CN201920809289.XU CN201920809289U CN210490446U CN 210490446 U CN210490446 U CN 210490446U CN 201920809289 U CN201920809289 U CN 201920809289U CN 210490446 U CN210490446 U CN 210490446U
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Abstract
The embodiment of the utility model provides a relate to power technical field, disclose a power protection circuit and power, this power protection circuit includes: the power supply protection circuit outputs low level when receiving a sleep command or a low battery voltage signal by setting the fuel gauge, so that the low dropout regulator can set the output power supply voltage to zero, and then the power-off of the control circuit is realized, and the power supply is protected.
Description
Technical Field
The utility model relates to a power technical field, in particular to power protection circuit and power.
Background
At present, batteries are used as energy sources, have the advantages of high energy density, portability and relatively stable performance. When the battery is applied to circuit design, the application in the battery field and the like often meet the requirement of ultra-low power consumption control. A battery with too low a battery voltage will usually cause permanent damage to the battery, so for a battery that is left for a long time, it is necessary to have a very low static power consumption to prolong the storage time of the battery as much as possible.
The conventional method for reducing the power consumption of the line is as follows: the hardware circuitry and software routines are optimized to reduce their quiescent state to a very low power consumption value.
In implementing the present invention, the inventors found that there are at least the following problems in the above related art: if the entire system is not powered down, there will be some power loss even though how the hardware circuitry and software programs are optimized.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power protection circuit and power to can cut off the power supply under realizing low-power consumption operating condition, thereby reduce power electric energy loss.
The utility model aims at realizing through the following technical scheme:
in order to solve the above technical problem, in a first aspect, the embodiment of the present invention provides a power protection circuit, including:
the electricity meter comprises an output end of the electricity meter, and is used for setting the output end of the electricity meter to be at a low level when a sleep instruction or a low battery voltage signal is acquired;
the low dropout linear regulator is used for outputting stable power voltage, and comprises a control end of the low dropout linear regulator, wherein the control end of the low dropout linear regulator is electrically connected with the output end of the electricity meter, and the low dropout linear regulator is used for receiving the low level and then zeroing the power voltage.
Optionally, the power protection circuit further includes: a microprocessor for outputting the sleep command or a low battery voltage signal;
the microprocessor and the fuel gauge are both provided with communication ports, and the communication port of the microprocessor is in communication connection with the communication port of the fuel gauge and is used for transmitting the sleep instruction or the low battery voltage signal;
the low dropout regulator further comprises an output end of the low dropout regulator, and the output end is used for outputting the power supply voltage;
the microprocessor also comprises a power input end of the microprocessor, and the power input end of the microprocessor is electrically connected with the output end of the low dropout linear regulator.
Optionally, the electricity meter further comprises a power input end of the electricity meter, and the power input end of the electricity meter is used for connecting a battery pack and acquiring a battery voltage of the battery pack;
the low dropout linear regulator further comprises an input end of the low dropout linear regulator, and the input end of the low dropout linear regulator is used for connecting the battery pack and obtaining the battery voltage of the battery pack.
Optionally, the power protection circuit further includes: the first filter circuit is connected between the battery pack and the input end of the low dropout regulator.
Optionally, the first filter circuit comprises:
a first resistor connected between the battery pack and the input terminal of the low dropout linear regulator;
and one end of the first capacitor is connected between the first resistor and the input end of the low dropout linear regulator, and the other end of the first capacitor is grounded.
Optionally, the power protection circuit further includes: and the second filter circuit is connected between the output end of the low dropout linear regulator and the power input end of the microprocessor.
Optionally, the second filter circuit comprises: and one end of the second capacitor is connected between the output end of the low dropout linear regulator and the power input end of the microprocessor, and the other end of the second capacitor is grounded.
Optionally, the power protection circuit further includes: and the voltage division circuit is connected between the output end of the fuel gauge and the control end of the low dropout regulator.
Optionally, the voltage divider circuit includes:
a second resistor connected between the output terminal of the fuel gauge and the control terminal of the low dropout regulator;
and one end of the third resistor is connected between the second resistor and the control end of the low dropout regulator, and the other end of the third resistor is grounded.
Optionally, the power protection circuit further includes: and the third filter circuit is connected between the voltage division circuit and the control end of the low dropout regulator.
Optionally, the third filter circuit comprises: and one end of the third capacitor is connected between the voltage division circuit and the control end of the low dropout linear regulator, and the other end of the third capacitor is grounded.
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 provides stable power supply voltage through the power supply protection circuit, and the power supply protection circuit controls the power-off of the battery pack when entering an ultra-low power consumption mode.
Compared with the prior art, the embodiment of the utility model provides a power protection circuit and a power supply; the power supply protection circuit outputs low level when receiving a sleep instruction or a low battery voltage signal by setting the fuel gauge, so that the low dropout linear regulator can zero the output power supply voltage, thereby controlling power failure, protecting a power supply and reducing power supply electric energy loss.
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 structural diagram of a power protection circuit provided in a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power protection circuit provided in the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of another power protection circuit provided in the first embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a power protection circuit provided in a first embodiment of the present invention;
fig. 5 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.
In addition, when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
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.
In circuit design, the requirement of ultra-low power consumption control is often met, such as application in the battery field. An excessively low battery voltage may cause permanent damage to the battery, so that for a battery that is left for a long time, it is necessary to have a very low static power consumption to prolong the storage time of the battery as much as possible.
At present, the conventional method for reducing the power consumption of the line is as follows: the hardware circuitry and software routines are optimized to reduce their quiescent state to a very low power consumption value. But if the entire system is not powered down, there will be some power drain even if it is re-optimized. It is also difficult to meet design requirements for some high-demand or extreme applications.
The embodiment of the utility model provides an utilize the function of the specific pin of coulometer chip, can turn off microprocessor's power when the coulometer gets into the ultra-low power consumption mode to make entire system's static consumption fall to minimumly. The utility model discloses technical scheme is owing to utilized the function foot of current chip, so the circuit realizes getting up simple relatively, in addition the utility model discloses a technical scheme coulometer also can send the mode of order through microprocessor except can getting into the low-power consumption initiatively, gets into the low-power consumption passively, and it is nimble convenient to use. Utilize the technical scheme of the utility model not only can remove some procedures and run away, microprocessor bolt-lock scheduling program trouble, can also avoid some static consumption problem on the high side that leads to because of the little electric leakage of components and parts simultaneously.
Specifically, the embodiments of the present invention will be further explained with reference to the drawings.
Example one
Referring to fig. 1, an embodiment of the present invention provides a power protection circuit 100, including: the power protection circuit 100 comprises an electricity meter U1 and a low dropout linear regulator U2, wherein a control end EN of the low dropout linear regulator is connected with an output end PBI of the electricity meter, and the power protection circuit 100 can be powered off and set the output power voltage to zero when acquiring a sleep command or a low battery voltage signal.
The power 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 (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 power can be cut off in the case of ultra-low power consumption of various products or electronic devices, thereby ensuring that static power consumption of the products or electronic devices is at a low level and prolonging storage time of the power source or the battery.
The following describes the protection circuit 100 provided by the embodiment of the present invention in detail with a battery pack as an electric energy source.
The fuel gauge U1 includes a fuel gauge output terminal PBI, and the fuel gauge U1 is configured to put the fuel gauge output terminal PBI low when a sleep command or a low battery voltage signal is acquired. The fuel gauge U1 may be capable of receiving a control command, such as a sleep command or a start command. The fuel gauge U1 can also be connected to the battery pack and obtain the level status of the battery pack. Thereby outputting a corresponding level signal according to a corresponding control command or according to a level state of the battery pack. The electricity meter U1 can be used to measure the amount of electricity passing through the circuit. The embodiment of the utility model provides an electricity meter U1 that adopts can be used for measuring on the one hand and passes through power protection circuit 100's electric quantity to the residual capacity of group battery is obtained through computational analysis. The embodiment of the utility model provides an on the other hand that the fuel gauge U1 adopted can also be used for acquireing control command or battery voltage and export corresponding level.
Specifically, when the electricity meter U1 acquires a sleep command, it outputs a low level at the output end PBI of the electricity meter; or when the fuel gauge U1 acquires a start instruction, a high level is output at the output end PBI of the fuel gauge. When the fuel gauge U1 is connected to a battery pack to measure the battery voltage of the battery pack, if the acquired battery voltage is lower than a certain threshold value, outputting a low level at an output end PBI of the fuel gauge; or if the acquired battery voltage is higher than the threshold value, and the fuel gauge U1 acquires a sleep command, outputting a low level at the output end PBI of the fuel gauge; or if the acquired battery voltage is higher than the threshold value, and the fuel gauge U1 does not acquire a control instruction or acquires a start instruction, a high level is output at the output end PBI of the fuel gauge. That is, the output terminal PBI of the fuel gauge outputs a low level whenever the fuel gauge U1 acquires a sleep command or detects that the battery voltage is a low battery voltage signal (the battery voltage is below a certain threshold).
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 having a chip model number of BQ40Z50, BQ40Z50-R1, BQ40Z80, or the like may be used 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 low dropout linear regulator U2 is used for outputting a stable power voltage, the low dropout linear regulator U2 comprises a control end EN of the low dropout linear regulator, the control end EN of the low dropout linear regulator is connected with an output end PBI of the fuel gauge, and the low dropout linear regulator U2 is used for setting the power voltage to zero when receiving the low level.
Specifically, the low dropout regulator U2 is configured to be connected to a battery pack, and output a stable power supply voltage after adjusting an output voltage of the battery pack. The low dropout regulator U2 is further used for being connected with the fuel gauge U1, and is used for controlling the on or off of the power supply voltage according to a level signal output by an output end PBI of the fuel gauge. When detecting that a level signal output by an output end PBI of the electricity meter is a high level signal, the low dropout regulator U2 normally outputs a power supply voltage; when the level signal output by the output end PBI of the electricity meter is detected to be a low level signal, the low dropout linear regulator U2 sets the power supply voltage to zero, so that the circuit is in a power-off state.
In the embodiment of the present invention, the Low dropout regulator U2 adopts a Low dropout regulator (i.e., LDO) with a switching function. The low dropout regulator U2 is an integrated circuit regulator, the low dropout regulator U2 has very low power consumption and can be used for controlling the main current channel, and the low dropout regulator U2 is integrated with a MOSFET (Metal-Oxide-Semiconductor Field-effect transistor) having very low on-line on-resistance, and has hardware circuits such as a schottky diode, a sampling resistor, and a voltage dividing resistor, and has functions of overcurrent protection, overtemperature protection, a precision reference source, a differential amplifier, a delay, etc. the low dropout regulator U2 generally has very low self-noise and a high power supply rejection ratio, in the embodiment of the present invention, the low dropout regulator U2 may be a commercially available low dropout regulator with a switching function, for example, in the embodiment of the utility model, can adopt the LDO power that the chip model is TPS 70933-Q1. In other embodiments, the specific model of the low dropout regulator U2, the specific connection mode with other modules, etc. can be set according to actual needs, and need not be restricted to the embodiment of the present invention.
The embodiment of the utility model provides an in provide a power protection circuit 100. The power protection circuit 100 controls the low dropout regulator U2 to set the output power voltage to zero by setting the fuel gauge U1 to output a low level when receiving a sleep command or a low battery voltage signal, thereby controlling the power protection circuit 100 to power off.
In some embodiments, referring to fig. 2, the power protection circuit 100 further includes: and a microprocessor U3. The microprocessor U3 is configured to output the sleep command or low battery voltage signal.
The microprocessor U3 can also be used to control other modules of the power protection circuit 100, as well as other circuits connected to the output of the power protection circuit 100. The microprocessor U3 can also be connected to an artificial or intelligent control system for receiving control information and converting the control information into control instructions executable by the circuit modules controlled by the microprocessor U3. For example, when sleep information is manually input into the control system, the microprocessor U3 converts the manually input sleep information into a sleep command or a low battery voltage signal that can be read by the fuel gauge U1 and sends the sleep command or the low battery voltage signal to the fuel gauge U1.
The microprocessor U3 and the fuel gauge U1 are both provided with communication ports, and a communication port TX of the microprocessor is in communication connection with a communication port RX of the fuel gauge and is used for transmitting the sleep command or the low battery voltage signal. Specifically, the communication port TX of the microprocessor and the communication port RX of the electricity meter may be communicatively connected by an I2C bus, a serial port, or other means. The microprocessor U3 sends a control command, for example, a start command or a sleep command, to the fuel gauge U1 through the communication port TX and the communication port RX, thereby controlling the level state of the output of the fuel gauge U1.
At least one microprocessor or microcomputer with computing power needs to be provided in the microprocessor U3. The microprocessor or microcomputer may be a plurality of microprocessors or microcomputers having a calculation function provided in each module in the power 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 to control 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 U3 also has a storage medium disposed therein, which stores a plurality of executable instructions and programs for data processing by the microprocessor U3. The microprocessor U3 may also be a small single-chip microcomputer. In other embodiments, the specific type of the microprocessor or the microcomputer in the microprocessor U3 may be set according to the actual requirement of the microprocessor U3 for data processing capability, and the specific circuit structure in the microprocessor U3 may be set according to the actual requirement, which is not limited by the embodiments of the present invention.
Furthermore, the communication port TX of the microprocessor and the communication port RX of the fuel gauge are capable of bidirectional data transmission. The fuel gauge U1 further includes a POWER input POWER1 of the fuel gauge, the POWER input POWER1 of the fuel gauge being configured to connect to the battery pack B + and obtain a battery voltage of the battery pack B +. On one hand, the electricity meter U1 can detect the electricity quantity flowing through the POWER protection circuit 100 through a POWER input end POWER1 of the electricity meter, and sends the real-time flowing electricity quantity information to the microprocessor U3 through a communication port RX of the electricity meter, the microprocessor U3 can obtain the residual electricity quantity of the battery pack B + after calculation processing, and when the residual electricity quantity of the battery pack B + is lower than a certain threshold value, a sleep command or a low battery voltage signal is sent to the electricity meter U1 to control the POWER protection circuit 100 to be powered off, so that the POWER supply passively enters a low POWER consumption state. The electricity meter U1 can detect the battery voltage state of the battery pack B + through the POWER input end POWER1 of the electricity meter, and when the battery voltage is lower than a certain threshold value, a low level is output to control the POWER protection circuit 100 to be powered off, so that the POWER supply actively enters a low POWER consumption state.
The low dropout regulator U2 further comprises an input end IN of the low dropout regulator, and the input end IN of the low dropout regulator is used for being connected with the battery pack B + and obtaining electric energy. The low dropout regulator U2 further includes an output terminal OUT of the low dropout regulator for outputting the supply voltage. The microprocessor U3 further includes a POWER input POWER2 of the microprocessor, the POWER input POWER2 of the microprocessor being connected to the output OUT of the low dropout linear regulator.
IN the embodiment of the present invention, the low dropout linear regulator U2 is followed the input IN of the low dropout linear regulator obtains the electric energy to carry out rectification, filtering, after dropping voltage with the battery voltage of input, output stable supply voltage, supply voltage is used for doing microprocessor U3 with other circuit module power supplies of power protection circuit 100. In the embodiment of the present invention, the low dropout linear regulator U2 stably outputs 3V dc low voltage, which is the power supplied by the microprocessor U3 and other circuit modules of the power protection circuit 100. In other embodiments, the voltage reduction capability of the low dropout regulator U2, etc. may be set according to actual conditions, and need not be limited by the embodiments of the present invention.
In some embodiments, referring to fig. 3, the power protection circuit 100 further includes: a first filter circuit 110, a second filter circuit 120, a voltage divider circuit 130, and a third filter circuit 140.
The first filter circuit 110 is connected between the battery B + and the input terminal IN of the low dropout linear regulator. The second filter circuit 120 is connected between the output OUT of the low dropout linear regulator and the POWER input POWER2 of the microprocessor. The voltage dividing circuit 130 is connected between the output end PBI of the fuel gauge and the control end EN of the low dropout regulator. The third filter circuit 140 is connected between the voltage divider circuit 130 and the control terminal EN of the low dropout regulator.
The embodiment of the utility model provides an in, the battery voltage warp of group battery B + output gets into after first filter circuit 110 filters low dropout linear regulator U2, after the battery voltage of low dropout linear regulator U2 after with the filtration carried out the rectification of stepping down, the rethread stable output mains voltage after second filter circuit 120 filters, for microprocessor U3 with other circuit module power supplies of power protection circuit 100. The level signal output by the fuel gauge U1 is subjected to current regulation by the voltage dividing circuit 130, filtered by the third filter circuit 140, and input to the control end EN of the low dropout regulator, so as to control the state of the power supply voltage output by the low dropout regulator U2.
The first filter circuit 110 is used for filtering noise in the current, so that the low dropout regulator U2 can obtain a stable battery voltage. The second filter circuit 120 is used to filter noise in the current, so that the microprocessor U3 and the power protection circuit 100 require other circuit modules to obtain a stable power voltage. The third filter circuit 140 is used to filter out noise in the current, so that the low dropout regulator U2 can detect an accurate level signal/voltage signal. The voltage dividing circuit 130 is configured to adjust the current, so as to adjust the current signal output by the output end PBI of the fuel gauge to the current signal that can be detected by the control end EN of the low dropout linear regulator.
Specifically, the types of the electronic components specifically adopted by the first filter circuit 110, the second filter circuit 120, the voltage divider circuit 130, and the third filter circuit 140, and the respective circuit connection modes and connection relationships thereof, the connection mode of the first filter circuit 110 and the low dropout regulator U2, the connection mode of the second filter circuit 120 and the low dropout regulator U2 and the connection mode of the microprocessor U3, the connection mode of the voltage divider circuit 130 and the fuel gauge U1 and the low dropout regulator U2, and the connection mode of the third filter circuit 140 and the voltage divider circuit 130 and the low dropout regulator U2 can be set according to actual needs, and there is no need to be limited by the embodiments of the present invention.
In some embodiments, please refer to fig. 4, fig. 4 is a specific circuit diagram of the power protection circuit 100 shown in fig. 3. The method specifically comprises the following steps:
the first filter circuit 110 includes: a first resistor R1 and a first capacitor C1. The first resistor R1 is connected between the battery pack B + and the input terminal IN of the low dropout linear regulator. One end of the first capacitor C1 is connected between the first resistor R1 and the input terminal IN of the low dropout linear regulator, and the other end of the first capacitor C1 is grounded.
The second filter circuit 120 includes: and one end of the second capacitor C2, one end of the second capacitor C2 is connected between the output end OUT of the low dropout linear regulator and the POWER input end POWER2 of the microprocessor, and the other end of the second capacitor C2 is grounded.
The voltage dividing circuit 130 includes: a second resistor R2 and a third resistor R3. The second resistor R2 is connected between the output end PBI of the fuel gauge and the control end EN of the low dropout regulator. One end of the third resistor R3 is connected between the second resistor R2 and the control end EN of the low dropout regulator, and the other end of the third resistor R3 is grounded.
The third filter circuit 140 includes: and one end of the third capacitor C3 is connected between the voltage dividing circuit 130 and the control end EN of the low dropout regulator, and the other end of the third capacitor C3 is grounded.
In some other embodiments, specific models of the first resistor R1, the first capacitor C1, the second capacitor C2, the second resistor R2, the third resistor R3 and the third capacitor C3, resistance values of the first resistor R1, the second resistor R2 and the third resistor R3, and capacitance values of the first capacitor C1, the second capacitor C2 and the third capacitor C3 may be set according to practical situations, and need not be limited by the embodiments of the present invention.
Example two
Referring to fig. 5, an embodiment of the present invention provides a power supply 200, where the power supply 200 includes: the battery pack B + and the power protection circuit 100 according to the first embodiment, the battery pack B + provides a stable power voltage through the power protection circuit 100, and the power protection circuit 100 controls the power-off of the battery pack B + when entering the ultra-low power consumption mode.
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 power supply can be cut off under the condition of ultra-low power consumption of various products or electronic devices, thereby ensuring that the static power consumption of the products or electronic devices is at a low level and prolonging the storage time of the power supply or the battery.
It should be noted that, since the power protection circuit 100 in the first embodiment is based on the same concept as the power protection circuit 100 provided in the first embodiment, the corresponding contents of the power protection circuit 100 in the first embodiment are also applicable to the corresponding contents of the power protection circuit 100 in the first embodiment, and are not described in detail here.
The battery pack B + may include one or more batteries, and the battery used in the battery pack 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 is formed by connecting a plurality of single batteries (battery cores) in series. The battery is formed by connecting a plurality of single batteries in series so as to meet the power supply requirements of various electric equipment. For example, the battery includes 4 or more than 4 single batteries, and the 4 or more than 4 single batteries are connected in series to meet different power supply requirements.
In the embodiment of the present invention, the battery pack B + is used as an electric energy source, and the power protection circuit 100 is followed by supplying power to each power module in the power protection circuit 100, and supplying power to other power modules in subsequent electronic devices except the power protection circuit 100. In other embodiments, the power supply 200 may not use the battery B + as the power source, and the battery B + may be replaced by a high-voltage ac power supply, a low-voltage ac power supply, a high-voltage dc power supply, or another low-voltage dc power supply. For example, the voltage may be mains power, and accordingly, the low dropout regulator U2 may be selected to convert the mains power into the power supply voltage. In other some embodiments, model, electric quantity size, quantity etc. of group battery B + can set up according to actual conditions, the electric energy source that power 200 adopted can set up according to actual conditions, need not be restricted to the utility model discloses the injeciton of embodiment.
The embodiment of the utility model provides a power supply; the power supply outputs low level when the power supply protection circuit needs to enter an ultra-low power consumption mode, so that the battery pack is enabled to be set to zero through the power supply voltage output by the power supply protection circuit, the circuit is controlled to be powered off, and the power supply is protected.
The embodiment of the utility model provides a power protection circuit and power; the power supply protection circuit outputs low level when receiving a sleep instruction or a low battery voltage signal by setting the fuel gauge, so that the low dropout linear regulator can zero the output power supply voltage, thereby controlling power failure, protecting a power supply and reducing power supply electric energy loss.
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 combinations between technical features in the above embodiments or in different embodiments are possible, 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 technical features in areas thereof may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its various embodiments.
Claims (12)
1. A power protection circuit, comprising:
the electricity meter comprises an output end of the electricity meter, and is used for setting the output end of the electricity meter to be at a low level when a sleep instruction or a low battery voltage signal is acquired;
the low dropout linear regulator is used for outputting stable power voltage, and comprises a control end of the low dropout linear regulator, wherein the control end of the low dropout linear regulator is electrically connected with the output end of the fuel gauge, and the low dropout linear regulator is used for receiving the power voltage and setting the power voltage to zero when the low level is received.
2. The power protection circuit of claim 1,
the power protection circuit further includes: a microprocessor for outputting the sleep command or a low battery voltage signal;
the microprocessor and the fuel gauge are both provided with communication ports, and the communication port of the microprocessor is in communication connection with the communication port of the fuel gauge and is used for transmitting the sleep instruction or the low battery voltage signal;
the low dropout regulator further comprises an output end of the low dropout regulator, and the output end is used for outputting the power supply voltage;
the microprocessor also comprises a power input end of the microprocessor, and the power input end of the microprocessor is electrically connected with the output end of the low dropout linear regulator.
3. The power protection circuit of claim 2,
the electricity meter also comprises a power supply input end of the electricity meter, and the power supply input end of the electricity meter is used for connecting a battery pack and acquiring the battery voltage of the battery pack;
the low dropout linear regulator further comprises an input end of the low dropout linear regulator, and the input end of the low dropout linear regulator is used for connecting the battery pack and obtaining the battery voltage of the battery pack.
4. The power protection circuit of claim 2,
the power protection circuit further includes: the first filter circuit is connected between the battery pack and the input end of the low dropout regulator.
5. The power protection circuit according to claim 4,
the first filter circuit includes:
a first resistor connected between the battery pack and the input terminal of the low dropout linear regulator;
and one end of the first capacitor is connected between the first resistor and the input end of the low dropout linear regulator, and the other end of the first capacitor is grounded.
6. The power protection circuit of claim 2,
the power protection circuit further includes: and the second filter circuit is connected between the output end of the low dropout linear regulator and the power input end of the microprocessor.
7. The power protection circuit of claim 6,
the second filter circuit includes: and one end of the second capacitor is connected between the output end of the low dropout linear regulator and the power input end of the microprocessor, and the other end of the second capacitor is grounded.
8. The power protection circuit of claim 2,
the power protection circuit further includes: and the voltage division circuit is connected between the output end of the fuel gauge and the control end of the low dropout regulator.
9. The power protection circuit according to claim 8,
the voltage dividing circuit includes:
a second resistor connected between the output terminal of the fuel gauge and the control terminal of the low dropout regulator;
and one end of the third resistor is connected between the second resistor and the control end of the low dropout regulator, and the other end of the third resistor is grounded.
10. The power protection circuit according to claim 8,
the power protection circuit further includes: and the third filter circuit is connected between the voltage division circuit and the control end of the low dropout regulator.
11. The power protection circuit of claim 10,
the third filter circuit includes: and one end of the third capacitor is connected between the voltage division circuit and the control end of the low dropout linear regulator, and the other end of the third capacitor is grounded.
12. A power supply, comprising: a battery pack and a power protection circuit as claimed in any one of claims 1 to 11, the battery pack providing a stable supply voltage through the power protection circuit and the power protection circuit controlling the battery pack to power down upon entering an ultra low power mode.
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| CN201920809289.XU CN210490446U (en) | 2019-05-31 | 2019-05-31 | Power protection circuit and power |
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| CN201920809289.XU CN210490446U (en) | 2019-05-31 | 2019-05-31 | Power protection circuit and power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086148A (en) * | 2019-05-31 | 2019-08-02 | 深圳市道通智能航空技术有限公司 | A kind of power protecting circuit and power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086148A (en) * | 2019-05-31 | 2019-08-02 | 深圳市道通智能航空技术有限公司 | A kind of power protecting circuit and power supply |
| WO2020239095A1 (en) * | 2019-05-31 | 2020-12-03 | 深圳市道通智能航空技术有限公司 | Power supply protection circuit and power supply |
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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. |