CN218767230U

CN218767230U - Electric quantity detection circuit and shooting equipment

Info

Publication number: CN218767230U
Application number: CN202222428891.3U
Authority: CN
Inventors: 陆声潘; 杨贵童
Original assignee: Insta360 Innovation Technology Co Ltd
Current assignee: Insta360 Innovation Technology Co Ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-03-28
Anticipated expiration: 2032-09-13

Abstract

The embodiment of the utility model provides a relate to shooting equipment technical field, disclose an electric quantity detection circuitry and shooting equipment. The electric quantity detection circuit is applied to electronic equipment with a control circuit. The circuit comprises a voltage sampling circuit and a current sampling circuit. The voltage sampling circuit is used for detecting the voltage value of the battery to be detected and outputting a corresponding voltage sampling signal, and the current sampling circuit is used for detecting the current value of the battery to be detected and outputting a corresponding current sampling signal; and the control circuit is used for calculating the electric quantity value of the battery to be detected according to the voltage sampling signal and the current detection signal. The utility model discloses multiplexing control circuit is as electric quantity computational element, and whole circuit realizes simply, can the shared volume of effectual reduction electric quantity detection circuitry.

Description

Electric quantity detection circuit and shooting equipment

Technical Field

The utility model relates to a shooting equipment technical field, in particular to electric quantity detection circuitry and shooting equipment.

Background

With the continuous progress of technology, various portable electronic devices, such as earphones, smart phones, handheld holders, and the like, are beginning to be widely used in people's daily life. These portable electronic devices typically employ batteries as the primary energy source for their proper operation. In the daily use process, a user always expects that the battery residual capacity of the electronic equipment can be obtained in time so as to be convenient for replacing or charging the battery and avoid the situations of power exhaustion and the like.

In order to implement the function of battery power detection, in a typical power detection scheme, an Integrated Circuit (IC) with corresponding functions is usually used for implementation, for example, a coulometer (battery fuel gauge) is used for calculation, and the volume of the coulometer itself is large, so that the volume of the implementation Circuit is large, and the requirement of small electronic devices cannot be met.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a power detection circuit with small occupied volume to overcome the defects of the conventional power detection scheme.

In order to solve the above technical problem, the embodiment of the present invention adopts one of the following technical solutions: the electric quantity detection circuit is applied to electronic equipment, the electronic equipment comprises a control circuit and an electric load, and the control circuit is used for controlling the electric load to work. This electric quantity detection circuit includes: the voltage sampling circuit is connected to a battery to be detected and is used for detecting the voltage value of the battery to be detected and outputting a corresponding voltage sampling signal;

the current sampling circuit is connected to a battery to be detected and is used for detecting the current value of the battery to be detected and outputting a corresponding current sampling signal;

the control circuit is respectively connected with the current sampling circuit and the voltage sampling circuit, and the control circuit is also used for calculating the electric quantity value of the battery to be tested according to the voltage sampling signal and the current sampling signal.

In one embodiment, the current sampling circuit includes:

the current sampling resistor is connected in series between the battery to be tested and the electric load;

the current sampling circuit includes: a first differential signal and a second differential signal formed across the current sampling resistor.

In one embodiment, the voltage sampling circuit includes: the circuit comprises a first resistor, a second resistor and a first capacitor;

wherein, one end of the first resistor is connected to the anode of the battery to be tested, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with the reference ground, the common end of the first resistor and the second resistor is connected with the control circuit,

one end of the first capacitor is connected with the common end of the first resistor and the second resistor, and the other end of the first capacitor is connected with the reference ground.

In one embodiment, the power detection circuit further includes:

a signal conditioning circuit; the signal conditioning circuit is provided with a first signal input end, a second signal input end, a first signal output end and a second signal output end;

the first signal input end is connected with one end of the current sampling resistor and used for receiving the first differential signal; the second signal input end is connected with the other end of the current sampling resistor and used for receiving the second differential signal;

the signal conditioning circuit is configured to process the first differential signal and the second differential signal into a first standard sampling signal and a second standard sampling signal suitable for the control circuit, and output the first standard sampling signal and the second standard sampling signal to the control circuit through the first signal output terminal and the second signal output terminal.

In one embodiment, the signal conditioning circuit comprises: a second capacitor and a third capacitor;

one end of the second capacitor is connected to the first signal output end, and the other end of the second capacitor is connected with a reference ground;

one end of the third capacitor is connected to the second signal output end, and the other end of the third capacitor is connected with a reference ground.

In one embodiment, the signal conditioning circuit comprises: a fourth capacitor;

one end of the fourth capacitor is connected to the first signal output end, and the other end of the fourth capacitor is connected to the second signal output end.

In one embodiment, the current sampling resistor is connected in series between the negative electrode of the battery to be tested and the electrical load, and the signal conditioning circuit includes: the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the bias voltage source;

one end of the third resistor is connected with the first signal input end, the other end of the third resistor is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with the bias voltage source, and the common end of the third resistor and the fifth resistor is connected to the first signal output end;

one end of the fourth resistor is connected with the second signal input end, the other end of the fourth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with the bias voltage source, and the common end of the fourth resistor and the sixth resistor is connected to the second signal output end.

In one embodiment, the power detection circuit further includes: a differential signal amplifying circuit;

the first input end and the second input end of the differential signal amplifying circuit are respectively connected with the first signal output end and the second signal output end of the signal conditioning circuit one by one, and the output end of the differential amplifying circuit is connected with the control circuit; the differential signal amplifying circuit is used for amplifying the differential signal output by the signal conditioning circuit.

In one embodiment, the power detection circuit further includes:

the first analog-to-digital conversion unit is used for receiving the voltage sampling signal and converting the voltage sampling signal into a corresponding first digital signal;

a second analog-to-digital conversion unit to receive the first and second differential signals and convert to corresponding second digital signals.

In one embodiment, the differential signal amplifying circuit and the control chip of the control circuit are arranged in the same integrated circuit; and/or the presence of a gas in the gas,

the first analog-to-digital conversion unit, the second analog-to-digital conversion unit and a control chip of the control circuit are arranged in the same integrated circuit.

In order to solve the above technical problem, the utility model discloses another technical scheme that embodiment adopted is: an electronic device is provided. The electronic device includes: the method comprises the following steps: a battery, an image sensor and the electric quantity detection circuit;

the voltage sampling circuit of the electric quantity detection circuit and the current sampling circuit are connected to the battery, and the control circuit of the electric quantity detection circuit is also connected with the image sensor and used for controlling the image sensor to work.

The embodiment of the utility model provides a power detection circuit's one of them favorable aspect is: the current sampling circuit and the voltage sampling circuit with small volumes are adopted to realize the current sampling of the battery to be detected, and then the control circuit of the multiplexing electronic equipment is used for calculating the electric quantity of the battery, so that the volume occupied by the electric quantity detection circuit is reduced. Moreover, the voltage sampling circuit and the current sampling circuit can provide real-time voltage and current information of the battery for the control circuit, and related functions such as battery management and the like are favorably realized.

Drawings

One or more embodiments are illustrated in corresponding drawings which are not intended to be limiting, in which elements having the same reference number designation may be referred to as similar elements throughout the drawings, unless otherwise specified, and in which the drawings are not to scale.

Fig. 1 is a schematic diagram of an electronic device provided by an embodiment of the present invention;

fig. 2 is a functional block diagram of an electric quantity detection circuit provided in an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a voltage sampling circuit according to an embodiment of the present invention;

fig. 4 is a functional block diagram of a power detection circuit according to another embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a signal conditioning circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a current detection resistor according to an embodiment of the present invention.

Detailed Description

The present invention is described in detail below with reference to specific embodiments, and it should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

It is to be understood that, unless otherwise expressly specified or limited, all positional or orientational relationships such as "central," "longitudinal," "lateral," "upper," "lower," "vertical," "horizontal," "inner," "outer," and the like are used in this specification in the context of the orientation or orientation illustrated in the drawings to facilitate the description of the invention and to simplify the description. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more; "and/or" includes any and all combinations of one or more of the associated listed items. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Fig. 1 is a functional block diagram of an electronic device according to an embodiment of the present invention. In some embodiments, the electronic device may be a small electronic device that is sensitive to volume, including but not limited to pan-tilt cameras, hand-held pan-tilt, panoramic cameras, and thumb cameras, among others. Use the embodiment of the utility model provides, the less electric quantity detection circuitry of occupation volume helps reducing these small-size electronic equipment's volume as far as, facilitates for these small-size electronic equipment's structural design etc.

As shown in fig. 1, the electronic apparatus includes: the device comprises a power detection circuit 10, a battery 20, a control circuit 30 and an electric load. The control circuit 30 is configured to control the electrical load to work, and the electrical load is not limited. For example, when the electronic device is a handheld cloud platform, the power consumption load may be a cloud platform motor, or may be a load such as an indicator light.

When the control circuit comprises a plurality of control sub-circuits, it may be that one of the control sub-circuits participates in the calculation of the battery level.

The power detection circuit 10 is a circuit structure capable of acquiring one or more relevant parameters of the battery 20 to characterize or calculate and determine the current capacity of the battery. In the present embodiment, the term "battery level" is used to indicate the current stored electrical energy of the battery. The specific representation of any suitable type can be selected and used according to the needs of the actual situation. For example, the current battery stores electrical energy as a percentage of the total electrical energy capacity of the battery or electrical energy consumed over a period of time, etc.

The battery 20 is an energy source that can continuously supply electric power. Any suitable type of implementation may be selected for providing the desired target voltage, such as a rechargeable battery, as the actual situation requires.

Control circuit 30 refers to any type of electronic system in an electronic device capable of performing one or more logical operations. In particular, any suitable type of implementation may be used, such as a microprocessor or other similar logic operation circuit, as the actual situation requires.

Of course, one skilled in the art can understand that one or more other functional modules can be optionally added or omitted in the electronic device according to the needs of the actual situation. An input/output device such as a display screen or touch keys capable of interacting with a user, etc., without being limited to that shown in fig. 1.

In the actual battery power detection process, the power detection circuit 10 can be roughly divided into a sampling part for collecting the relevant parameters of the battery and a data processing part for processing the collected relevant parameters to convert into the battery power according to the functions executed by the circuit. The sampling portions thereof may be disposed as separate peripheral circuits at the positive and negative electrodes of the battery 20. The data processing part can be calculated by the multiplexing control circuit 30 to reduce the volume of the electric quantity detection circuit.

Of course, those skilled in the art can also selectively adjust the division and arrangement of the functional units in the power detection circuit according to the needs of actual situations, and is not limited to the illustration shown in the drawings of the specification.

Fig. 2 is a functional block diagram of an electric quantity detection circuit provided by an embodiment of the present invention. The electric quantity detection circuit can be applied to the electronic equipment shown in fig. 1, and the detection of the electric quantity of the battery is realized. As shown in fig. 2, the power detection circuit 10 may include: a voltage sampling circuit 110 and a current sampling circuit.

The voltage sampling circuit 110 is a circuit module for acquiring a battery voltage. Which may be connected to the battery under test and form a voltage sampling signal corresponding to (e.g., proportional to) the voltage value of the battery under test. In the present embodiment, the term "proportional" is used to indicate that there is a functional relationship between the voltage signal and the battery voltage value that can be predetermined, for example, a fixed specific reduction ratio.

The current sampling circuit can be realized by adopting the current sampling resistor 120, collects the voltage at two ends of the current sampling resistor, and calculates the current by combining the resistance value of the current sampling resistor and the ohm law. The voltages at the two ends of the current sampling resistor can be calculated by the subtracter, and then output to the control circuit, or can be directly output to the control circuit 30 as the first differential signal and the second differential signal, so that the control circuit 30 calculates the voltages at the two ends of the current sampling resistor according to the two differential signals. In some embodiments, the voltage across the current sampling resistor may be directly output to the control circuit 30 as the first differential signal and the second differential signal, so as to reduce the construction of the subtractor and further reduce the volume of the power detection circuit. Specifically, the current sampling resistor 120 is connected in series between the battery under test and the electrical load. When the charging current or the discharging current of the battery under test flows through the current sampling resistor 120, a first differential signal and a second differential signal corresponding to (e.g., proportional to) the current value are formed at two ends of the current sampling resistor 120. Specifically, the "current value flowing through the current sampling resistor" may include a discharge current value of the battery to be tested for supplying power to the electrical load. And in the case that the battery to be tested is a rechargeable battery, the electric load can be replaced by a charger for supplying charging voltage. Accordingly, the current value may also include a charging current value for charging the battery to be tested, and is not particularly limited herein. Compared with a current sampling implementation scheme using a coulometer or other current sampling schemes, the current sampling resistor occupies a smaller volume and is lower in cost, and the layout of electronic equipment such as a thumb camera is facilitated to be miniaturized.

In the present embodiment, for convenience of description, a voltage signal formed at one end of the current sampling resistor 120 connected to the battery to be tested is referred to as a first differential signal, and a voltage signal formed at one end of the current sampling resistor 120 connected to the electrical load is referred to as a second differential signal. It can be understood that the difference and magnitude between the two differential signals can represent the direction and magnitude of the current flowing through the current sampling resistor, and are proportional to the current value of the battery to be tested.

Although the term "current sampling resistance" is used in the present embodiment to denote the current detection resistance. It will be understood by those skilled in the art that the current sampling resistor is not limited to the specific implementation of the resistor, and any suitable type of device with a specific resistance value can be selected and used according to the needs of the actual situation, and is not limited to a separate resistor.

The control circuit 30 can control the electric load to work and reuse as a calculation unit of electric quantity, so as to further reduce the volume, that is, only the current sampling resistor and the voltage sampling circuit are added on the basis of the traditional electronic device in the embodiment, so that the high-precision detection of the electric quantity of the battery can be realized, and the cost and the occupied area/volume of the electric quantity detection circuit can be greatly reduced. The control circuit 30 may include a plurality of control chips, wherein at least one control chip is reused for power calculation.

In the actual use process, it should be noted that the implementation manner of the control circuit 30 for calculating the electric quantity of the battery is not limited, and the control circuit 30 may calculate a corresponding current value according to the received first differential signal and the second differential signal, that is, the voltage values at the two ends of the current sampling resistor, and by combining the resistance value of the current sampling resistor, and by using the ohm law, determine the electric quantity consumed/charged by the battery to be tested for a period of time by calculating the integral of the current value, and further determine the current preliminary electric quantity value of the battery to be tested. Then, the control circuit 30 corrects the preliminary charge amount in conjunction with the voltage value of the battery, thereby obtaining an accurate charge amount value. Alternatively, the control circuit 30 may calculate only an integration result of the current value in the time period from the start time to the end time to determine the consumed/charged electric quantity of the battery to be tested in the time period, and then subtract/add the consumed/charged electric quantity with the known electric quantity of the battery to be tested at the start time, thereby obtaining the electric quantity value of the battery to be tested at the end time.

The embodiment of the utility model provides a power detection circuit's one of them favorable aspect is: the current sampling circuit and the voltage sampling circuit with small volumes are adopted to realize the current sampling of the battery to be detected, and then the control circuit 30 of the multiplexing electronic equipment is used for calculating the electric quantity of the battery, so that the volume occupied by the electric quantity detection circuit is reduced. Moreover, the control circuit 30 can be provided with real-time voltage and current information of the battery through the voltage sampling circuit and the current sampling circuit, which is beneficial to realizing related functions such as battery management and the like.

In some embodiments, as shown in fig. 3, the voltage sampling circuit may be a sampling circuit implemented based on a voltage dividing resistor, and the voltage dividing circuit may output a voltage sampling signal with a voltage value lower than the battery voltage, so as to avoid damaging the control circuit 30. It should be noted that, compared with other voltage sampling circuit implementation schemes, the voltage dividing circuit can be built only by a small number of resistors, and therefore, the voltage dividing circuit is selected as the voltage sampling circuit, which is beneficial to reducing the volume occupied by the voltage sampling circuit.

Specifically, the voltage sampling circuit 110 includes: the circuit comprises a first resistor R1, a second resistor R2 and a first capacitor C1.

The first resistor R1 and the second resistor R2 adopt a series voltage division connection mode. One end of the first resistor R1 may be connected to the positive electrode BAT + of the battery to be tested, and the other end of the first resistor R2 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to ground GND. Thus, a voltage signal lower than the battery voltage value can be formed at the common terminal a between the first resistor R1 and the second resistor R2 and supplied to the control circuit 30 as a voltage sampling signal. The proportional relationship between the battery voltage signal and the battery voltage value may be determined by the ratio of the resistance values between the first resistor R1 and the second resistor R2.

One end of the first capacitor C1 is connected to the common terminal a, and the other end of the first capacitor is connected to the ground GND. Through the additionally arranged first capacitor, the voltage sampling signal provided to the control circuit 30 can be filtered, so that the voltage sampling signal is kept stable and accurate, and the accuracy of the electric quantity detection result is ensured.

It should be noted that the present embodiment exemplarily shows a specific example of implementing the voltage sampling circuit by two resistors connected in series. However, those skilled in the art may also adjust, replace or modify the voltage sampling circuit based on the principle of voltage division by resistors according to the needs of actual situations, and is not limited to the description shown in fig. 3.

In some embodiments, as shown in fig. 4, the power detection circuit may further include: a signal conditioning circuit 140.

The signal conditioning circuit 140 is configured to perform several kinds of signal processing on the received first differential signal and the second differential signal, so as to convert the received first differential signal and the received second differential signal into standard signals suitable for the control circuit 30. Specifically, the signal processing manner performed by the signal conditioning circuit 140 may be determined according to the needs of the actual situation, including but not limited to one or more combinations of bias voltage division, filtering, isolation and amplification. And is not particularly limited herein.

The signal conditioning circuit has at least one pair of signal input and signal output, adapted to the double-ended signal of the first and second differential signals. In the present embodiment, for the sake of convenience of description, they are referred to as "first signal input terminal", "second signal input terminal", "first signal output terminal", and "second signal output terminal", respectively.

In practical applications, the first differential signal may be input from the first signal input terminal, and after signal conditioning, the first differential signal is converted into the first standard signal and output from the first signal output terminal. The second differential signal can be input from the second signal input end, and after signal conditioning, the second differential signal is converted into a second standard signal and output from the second signal output end.

The embodiment of the utility model provides a power detection circuit's one of them favorable aspect is: the current sampling signal can be provided for the control circuit 30 accurately, the required current sampling signal is met, the accuracy of the electric quantity detection result is ensured, the problems that the voltage value of the current sampling signal is too large and the like are solved, and the control circuit 30 is damaged.

As shown in fig. 5, in some embodiments, the signal conditioning circuit 140 includes: a second capacitor C2 and a third capacitor C3.

One end of the second capacitor C2 is connected to the first signal output terminal OUT _1. The other end of the second capacitor C2 is connected to ground GND. One end of the third capacitor C3 is connected to the second signal output terminal OUT _2, and the other end of the third capacitor C3 is connected to the ground GND. Through adjusting second electric capacity C2 and third electric capacity C3 to suitable capacitance value, can realize common mode filtering, avoid the unstable interference that brings of common mode voltage, promote differential signal's stability.

In other embodiments, with continued reference to fig. 5, based on the second capacitor C2 and the third capacitor C3, the signal conditioning circuit 140 further includes: and a fourth capacitor C4.

One end of the fourth capacitor C4 is connected to the first signal output terminal OUT _1, and the other end of the fourth capacitor C4 is connected to the second signal output terminal OUT _2. By adjusting the fourth capacitor C4 to a suitable capacitance value, differential mode filtering can be achieved.

In some embodiments, with continuing reference to fig. 5, the current sampling resistor is connected in series between the negative electrode of the battery under test and the power load, and the signal conditioning circuit 140 may further include: and the bias voltage division circuit consists of a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a bias voltage source VCC.

One end of the third resistor R3 is connected with the first signal input end IN _1, and the other end of the third resistor R3 is connected with a bias voltage source VCC through a fifth resistor R5; a common terminal of the third resistor R3 and the fifth resistor R5 is connected to the first signal output terminal OUT _1. One end of a fourth resistor R4 is connected with the second signal input end IN _2, and the other end of the fourth resistor R4 is connected with a bias voltage source VCC through a sixth resistor R6; a common terminal of the fourth resistor R4 and the sixth resistor R6 is connected to the second signal output terminal OUT _2.

The bias voltage source VCC is a constant voltage source for providing a desired bias voltage. The method can specifically select and use a proper implementation mode according to the needs of actual situations. For example a dc voltage source providing a certain voltage value.

The embodiment of the utility model provides an electric quantity detection circuitry's one of them favorable aspect is: by providing proper bias voltage and partial pressure processing for the differential signal, the voltage of the differential signal acquired by the negative electrode of the battery to be detected is raised, so that the operation of a subsequent amplifying circuit is facilitated, and the detection of the differential signal by the control circuit 30 is also facilitated.

In some embodiments, with continued reference to fig. 4, the power detection circuit may further include: a differential signal amplifying circuit 150.

The differential signal amplification circuit 150 is a functional block for amplifying a differential signal. Which is connected between the signal conditioning circuit 140 and the control circuit 30 and can amplify the standard signal outputted from the signal conditioning circuit for the processing of the control circuit 30.

Specifically, the differential signal amplifying circuit 150 may be disposed in the same integrated circuit as the control circuit 30, that is, the control chip of the control circuit 30 can provide the differential signal amplifying function. Alternatively, when the control chip of the control circuit 30 does not have the differential signal amplification function, a separate signal amplifier may be provided outside to meet the use requirement.

In some embodiments, referring to fig. 4, based on the voltage sampling signal, the first differential signal and the second differential signal provided to the control circuit in the form of analog signals, the power detection circuit may further include a first analog-to-digital conversion unit 161 and a second analog-to-digital conversion unit 162.

The analog-to-digital conversion unit is a functional module capable of converting an input analog signal into a corresponding digital signal at an ideal sampling rate. In the present embodiment, terms such as "first" and "second" are used for convenience of presentation to indicate functional blocks for two types of sampling signals, and are not used to limit the number or specific implementation forms of the following modified terms.

Similarly to the differential signal amplifying circuit, the analog-to-digital converting unit may be integrated in a control chip of the control circuit 30, that is, the control chip of the control circuit 30 has an analog-to-digital converting function, or is independent from the control chip of the control circuit 30 and is a part of a peripheral circuit.

In one embodiment, the differential signal amplifying circuit 150 and the control chip of the control circuit 30 are disposed in the same integrated circuit; and/or the presence of a gas in the gas,

the first analog-to-digital conversion unit 161, the second analog-to-digital conversion unit 162 and the control chip of the control circuit 30 are disposed in the same integrated circuit.

In this embodiment, the control circuit 30 may be constructed by using a control chip integrated with a differential amplification circuit, a first analog-to-digital conversion unit, and a second analog-to-digital conversion unit. Compared with a differential amplification circuit, an analog-to-digital converter and a control chip without differential amplification and analog-to-digital conversion, the integrated arrangement of the embodiment is favorable for further reducing the occupied volume of the electric quantity detection circuit and meeting the miniaturization requirement of electronic equipment.

It should be noted that, in order to fully explain the inventive concept of the present invention, in the above embodiments, the functions to be executed by each module are described in a manner of functional naming according to the functions to be implemented in the power detection circuit. Those skilled in the art will appreciate that, on the basis of the functions to be realized by the modules disclosed in the above embodiments, the specific implementations may be modified, replaced or changed according to the actual needs, and are not limited to the embodiments described in the specification.

In order to fully illustrate the power detection circuit according to the embodiment of the present invention, the following describes the specific implementation and the operation principle of the power detection circuit in detail with reference to fig. 3, fig. 5, and fig. 6.

As shown in fig. 3, the voltage sampling circuit has a first battery interface T1 connected to the battery positive electrode BAT + and a voltage detection terminal SEN for outputting a voltage sampling signal.

One end of the first resistor R1 is connected to the first battery interface T1, and the other end of the first resistor R1 is connected to the ground GND through the second resistor R2. The first resistor R1 and the second resistor R2 have a common terminal A therebetween. The common terminal a also forms a voltage sense terminal SEN for providing a voltage sampling signal to the control circuit. One end of the first capacitor C1 is connected to the common terminal a, and the other end of the first capacitor C1 is connected to the ground GND.

In the actual voltage sampling process, the first resistor R1 and the second resistor R2 are set to be proper resistance values, the protection effect on the control circuit is achieved through a resistor voltage division mode, and the situation that the voltage of a positive electrode of the battery is higher than the voltage bearing capacity of a control chip of the control circuit when the circuit is conducted is avoided. The first capacitor C1 can perform filtering to stabilize the output voltage of the battery, thereby ensuring the stability and accuracy of the sampled voltage signal output from the voltage detection terminal SEN.

As shown in fig. 6, the current sensing portion of the current sampling circuit has a second battery interface T2 connected to the battery negative electrode BAT-. Wherein, the current sampling resistor R _sense Is connected to the second battery interface T2, a current sampling resistor R _sense And the other end thereof is connected to ground GND. Current sampling resistor R _sense Are electrically connected to the first signal input terminal IN _1 and the second signal input terminal IN _2 through jumper caps J1 and J2, respectively.

As shown IN fig. 5, IN the signal conditioning circuit, one end of a fifth resistor R5 is connected to a bias voltage source VCC with a preset voltage, and the other end is connected to a first signal input terminal IN _1 through a third resistor R3; one end of the sixth resistor R6 is connected to a bias voltage source VCC with a predetermined voltage, and the other end is connected to the second signal input terminal IN _2 through the fourth resistor R4. One end of the second capacitor C2 is connected to the reference ground, and the other end of the second capacitor C2 is connected to the first signal output end OUT _1; one end of the third capacitor C3 is connected to the reference ground, and the other end of the third capacitor C3 is connected to the second signal output terminal OUT _2. Both ends of the fourth capacitor C4 are connected to the first signal output terminal OUT _1 and the second signal output terminal OUT _2, respectively.

During the actual voltage sampling process, the current sampling resistor R _sense The magnitude of and the difference between the first differential signal and the second differential signal across the two terminals may reflect the current flowing through the current sampling resistor R _sense The current direction and the current value of (c). The skilled person can set the appropriate resistance value according to the requirements of the actual situation, such as the accuracy requirement of the electricity detection.

The third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 can perform the functions of voltage division and providing proper bias for the differential signal, so that the differential signal output from the first signal output terminal and the second signal output terminal can be normally amplified. The first capacitor C1, the second capacitor C2 and the third capacitor C3 can increase the stability of the differential signal.

In the actual electricity quantity detection process, the control circuit of the electronic equipment is used for calculating the electricity quantity according to the voltage and the current of the battery. The control chip of the control circuit has analog-to-digital conversion (ADC) and differential signal amplification functions. One of the pins of the control chip is connected with the voltage detection end SEN, and ADC acquisition is carried out on the received third voltage signal at a certain sampling rate to obtain a corresponding voltage value. The control chip is also provided with another group of pins connected with the first signal output end and the second signal output end, and the received differential signals are amplified at a certain sampling rate and subjected to ADC (analog to digital converter) acquisition to obtain corresponding current values. In other embodiments, in the case that the control chip does not have the differential signal amplification function, an independent differential signal amplification circuit may be further provided to implement the signal amplification function. And finally, the control chip can take out the acquired voltage value and current value, and calculate and determine the electric quantity of the battery.

The embodiment of the utility model provides a power detection circuit's one of them favorable aspect is: the circuit can be realized by using a capacitor and a resistor, and the realization cost of the circuit is effectively reduced. In addition, the control strategy of the circuit is simple, the voltage and the current value of the battery can be provided at the same time, and the circuit has a good application prospect.

The utility model also provides a shooting device, which comprises the electric quantity detection circuit and a battery; the specific structure of the electric quantity detection circuit refers to the above embodiments, and since the shooting device adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated here. Wherein, the voltage sampling circuit and the current sampling circuit of the electric quantity detection circuit are connected to the battery.

In an embodiment, the shooting device further includes an image sensor, and the control circuit of the electric quantity detection circuit is further connected to the image sensor and configured to control the image sensor to operate.

That is, the control circuit 30 for controlling the operation of the image sensor is multiplexed as the control circuit of the current detection circuit, and therefore, the current detection circuit can be realized only by adding the current sampling resistor and the voltage sampling circuit on the basis of the original shooting device, the volume of the current detection circuit is effectively reduced, and the requirement of the shooting device on the volume miniaturization is favorably met.

The foregoing is a further detailed description of the invention in connection with specific/preferred embodiments and it is not intended that the invention be limited to these specific embodiments. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an electric quantity detection circuit, is applied to electronic equipment, electronic equipment includes control circuit and power consumption load, control circuit is used for controlling power consumption load work, its characterized in that includes:

the voltage sampling circuit is connected to a battery to be detected and is used for detecting the voltage value of the battery to be detected and outputting a corresponding voltage sampling signal;

2. The power detection circuit of claim 1, wherein the current sampling circuit comprises:

3. The power detection circuit of claim 1, wherein the voltage sampling circuit comprises: the circuit comprises a first resistor, a second resistor and a first capacitor;

4. The power detection circuit of claim 2, further comprising:

the signal conditioning circuit is configured to process the first differential signal and the second differential signal into a first standard sampling signal and a second standard sampling signal suitable for the control circuit, and then output the first standard sampling signal and the second standard sampling signal to the control circuit through the first signal output end and the second signal output end.

5. The power detection circuit of claim 4, wherein the signal conditioning circuit comprises: a second capacitor and a third capacitor;

one end of the third capacitor is connected to the second signal output end, and the other end of the third capacitor is connected with a reference ground;

and/or, the signal conditioning circuit comprises: a fourth capacitor;

6. The power detection circuit of claim 5, wherein the current sampling resistor is connected in series between the negative terminal of the battery under test and the power load, and the signal conditioning circuit comprises: the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the bias voltage source;

7. The power detection circuit of claim 4, further comprising: a differential signal amplifying circuit;

the first input end and the second input end of the differential signal amplifying circuit are respectively connected with the first signal output end and the second signal output end of the signal conditioning circuit one by one, and the output end of the differential signal amplifying circuit is connected with the control circuit; the differential signal amplifying circuit is used for amplifying the differential signal output by the signal conditioning circuit.

8. The power detection circuit of claim 7, further comprising:

9. The power detection circuit of claim 8,

the differential signal amplifying circuit and the control chip of the control circuit are arranged in the same integrated circuit; and/or the presence of a gas in the gas,

10. A photographing apparatus, characterized by comprising: a battery, an image sensor, and a charge detection circuit as claimed in any one of claims 1-9;