CN210775774U - Battery power display circuit and switching power supply - Google Patents
Battery power display circuit and switching power supply Download PDFInfo
- Publication number
- CN210775774U CN210775774U CN201921230130.9U CN201921230130U CN210775774U CN 210775774 U CN210775774 U CN 210775774U CN 201921230130 U CN201921230130 U CN 201921230130U CN 210775774 U CN210775774 U CN 210775774U
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- battery
- amplifier
- display circuit
- 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
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses battery power display circuit is applied to digital camera, including touch detection circuitry, control circuit and power detection and display circuit, wherein: the touch detection circuit the control circuit with the electric quantity detects and is connected in order with the display circuit, touch detection circuit is used for when detecting that the human body is close to or touches, output switch signal gives control circuit, control circuit is used for controlling whether electric quantity detects and the display circuit works, electric quantity detects and the display circuit is used for detecting and shows the battery electric quantity. Through battery power display circuit can show battery power on the battery case after detecting that the human body is close to or touches, need not to open digital camera or press mechanical button and look over battery power, more convenient and fast.
Description
Technical Field
The utility model relates to a battery management field, concretely relates to battery power display circuit and switching power supply.
Background
At present, a lithium battery is generally adopted for supplying power for a digital camera, most digital single lens reflex cameras are provided with a battery bin for installing a battery, and meanwhile, the battery bin is provided with a battery bin cover, and after the bin cover is covered, the lithium battery is in a fully-closed battery bin. Most digital camera batteries do not have an electric quantity indicating function, if the electric quantity of the batteries needs to be checked, the batteries need to be installed in the digital camera, then the digital camera is started, and the electric quantity is checked through a screen of the digital camera. It is cumbersome to view the battery power of the digital camera.
Some digital cameras have a semi-closed battery compartment, the battery can be seen from the outside after being mounted on the camera, and some batteries have an electric quantity indicating function, but are generally in a mechanical key type, and the electric quantity of the battery is displayed after the mechanical key is pressed. The mechanical key displays the battery power and has the following defects: 1. the mechanical keys occupy large space, and the general digital cameras are compact and have limited space; 2. waterproof and dustproof treatment is not easy to carry out, and mechanical keys are generally provided with protruding key caps due to the fact that the mechanical keys need to be pressed by external force, so that the appearance structure is limited; 3. when a digital camera shoots videos or photos, the camera is generally required to be relatively stable, and the camera is inevitably unstable and pictures are unstable when a mechanical key is used; 4. the mechanical key has short service life, and the panel covering the key cap is easy to damage after long-term use.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a battery power display circuit and switching power supply can be detecting the human body and be close to or touch the back and show battery power on the battery case, need not to open digital camera or press mechanical button and look over battery power, more convenient and fast.
In a first aspect, an embodiment of the present invention provides a battery power display circuit, which is applied to a digital camera, including a touch detection circuit, a control circuit and a power detection and display circuit, wherein:
the touch detection circuit is used for outputting a switch signal to the control circuit when detecting that a human body is close to or touches the touch detection circuit, the control circuit is used for controlling whether the electric quantity detection and display circuit works or not, and the electric quantity detection and display circuit is used for detecting and displaying the electric quantity of the battery.
In one embodiment, the touch detection circuit includes a conductive sheet, a first capacitor and a touch sensing chip, the conductive sheet is connected to the input pin of the touch sensing chip, and two ends of the first capacitor are respectively connected to the capacitor input pin of the touch sensing chip and the ground.
In one embodiment, the control circuit includes a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, and a first power supply, the first power supply is connected to the power input pin of the touch sensing chip, two ends of the first resistor are respectively connected to the first power supply and the output pin of the touch sensing chip, two ends of the second resistor are respectively connected to the first power supply and the drain of the first MOS transistor, the source of the first MOS transistor is grounded, the gate of the first MOS transistor is connected to the output pin of the touch sensing chip, the gate of the second MOS transistor is connected to the drain of the first MOS transistor, and the source of the second MOS transistor is grounded.
In one embodiment, the power detection and display circuit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first light emitting diode, a second light emitting diode, a third light emitting diode, a fourth light emitting diode, a first zener diode, a second power supply, and an operational amplifier, the operational amplifier includes a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier, an anode and a cathode of the first light emitting diode are respectively connected to one end of the second power supply and one end of the third resistor, the other end of the third resistor is connected to an output end of the first amplifier, an anode and a cathode of the second light emitting diode are respectively connected to one end of the second power supply and one end of the fourth resistor, and the other end of the fourth resistor is connected to an output end of the second amplifier, the anode and the cathode of the third light emitting diode are respectively connected with the second power supply and one end of a fifth resistor, the other end of the fifth resistor is connected with the output end of the third amplifier, the anode and the cathode of the fourth light emitting diode are respectively connected with the second power supply and one end of a sixth resistor, the other end of the sixth resistor is connected with the output end of the fourth amplifier, the two ends of the seventh resistor are respectively connected with the second power supply and the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is connected with the drain electrode of the second MOS tube, the two ends of the eighth resistor are respectively connected with the second power supply and the negative phase input end of the first amplifier, the two ends of the ninth resistor are respectively connected with the negative phase input end of the first amplifier and the negative phase input end of the second amplifier, and the two ends of the tenth resistor are respectively connected with the negative phase input end of the second amplifier and the negative phase input end of the third amplifier Two ends of the eleventh resistor are respectively connected to the negative-phase input end of the third amplifier and the negative-phase input end of the fourth amplifier, two ends of the twelfth resistor are respectively connected to the negative-phase input end of the fourth amplifier and the anode of the first zener diode, the positive-phase input end of the first amplifier is connected to the cathode of the first zener diode, the positive-phase input end of the second amplifier is connected to the cathode of the first zener diode, the positive-phase input end of the third amplifier is connected to the cathode of the first zener diode, the positive-phase input end of the fourth amplifier is connected to the cathode of the first zener diode, the input end of the operational amplifier is connected to the second power supply, and the output end of the operational amplifier is connected to the drain of the second MOS transistor.
In one embodiment, the battery case portion or all of the digital camera is a transparent or translucent material for displaying the battery level.
In one embodiment, when a human body approaches or touches the conductive sheet, the output pin of the touch sensing chip outputs a low level, the first MOS transistor is not turned on, the second MOS transistor is turned on, and the electric quantity detection and display circuit operates; or
When a human body is not close to or touches the conducting strip, the output pin of the touch sensing chip outputs a high level, the first MOS tube is conducted, the second MOS tube is not conducted, and the electric quantity detection and display circuit does not work.
In one embodiment, the first through fourth light emitting diodes light up when a battery voltage of the digital camera is between a first voltage and a second voltage; or
When the battery voltage of the digital camera is between the second voltage and a third voltage, the first light-emitting diode to the third light-emitting diode are lighted; or
When the battery voltage of the digital camera is between the third voltage and the fourth voltage, the first light-emitting diode and the second light-emitting diode are lighted; or
When the battery voltage of the digital camera is between the fourth voltage and the fifth voltage, the first light-emitting diode is lightened; or
And when the voltage of the battery of the digital camera is lower than the fifth voltage, the digital camera does not work when the lamp is not turned on.
In one embodiment, the battery voltage and the battery charge of the digital camera are approximately linear when the battery voltage is between the first voltage and the third voltage, and the battery charge drops sharply when the battery voltage is less than the fifth voltage.
In one embodiment, the first MOS transistor and the second MOS transistor are both N-channel MOS transistors.
In a second aspect, an embodiment of the present invention provides a switching power supply, including the embodiment of the present invention discloses in a first aspect a battery power display circuit.
The utility model discloses in, battery power display circuit is applied to digital camera, detect and the display circuit including touch detection circuit, control circuit and electric quantity, wherein: the touch detection circuit the control circuit with the electric quantity detects and is connected in order with the display circuit, touch detection circuit is used for when detecting that the human body is close to or touches, output switch signal gives control circuit, control circuit is used for controlling whether electric quantity detects and the display circuit works, electric quantity detects and the display circuit is used for detecting and shows the battery electric quantity. Through battery power display circuit can show battery power on the battery case after detecting that the human body is close to or touches, need not to open digital camera or press mechanical button and look over battery power, more convenient and fast.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background of the present invention, the drawings related to the embodiments or the background of the present invention will be briefly described below.
Fig. 1 is a schematic structural diagram of a battery power display circuit according to an embodiment of the present invention;
fig. 2 is a circuit topology diagram of a battery power display circuit according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a relationship between a battery voltage and a battery power of a digital camera according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The utility model discloses mainly solve the problem of digital camera battery power display. The battery power display is generally triggered and displayed by a key, and after the trigger key is pressed down, the battery residual power is indicated by a plurality of LED lamps, a display screen or a multi-color LED. After the digital camera is shaped, the matched battery is also shaped, the external dimension cannot be changed, the function of displaying the electric quantity cannot be increased by changing the external dimension, otherwise, the battery cannot be installed on the corresponding digital camera, and the mechanical key is generally large in size, so that the electric quantity of the battery cannot be triggered and indicated by adopting the mechanical key. In addition, the mechanical keys have key strokes, the battery shell is shaped and fixed in size, and the working requirements of the mechanical keys cannot be met. The battery housing material is typically plastic or other insulating material and is generally opaque.
Inside more or less all there is some spaces of sealed battery case, the utility model discloses a with touch-sensitive copper sheet and battery power display part all install inside the battery case to partly or whole transparent or translucent material that changes to use of battery case, like this, the light that is used for showing the LED lamp of battery power or display screen just can pierce through the shell when the human body is close to or touches battery case, thereby shows the electric quantity. In addition, because devices such as the touch sensing copper sheet are completely installed in the battery case, the external dimension, the water resistance and the dust resistance of the battery are not influenced. Since the remaining battery capacity is generally related to the battery voltage, the current remaining battery capacity can be detected by detecting the current battery voltage.
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery power display circuit 100 according to an embodiment of the present invention, which is applied to a digital camera, and includes a touch detection circuit 101, a control circuit 102, and a power detection and display circuit 103, wherein:
the touch detection circuit 101, the control circuit 102 and the electric quantity detection and display circuit 103 are sequentially connected, the touch detection circuit 101 is used for outputting a switch signal to the control circuit 102 when a human body is detected to be close to or touched, the control circuit 102 is used for controlling whether the electric quantity detection and display circuit 103 works, and the electric quantity detection and display circuit 103 is used for detecting and displaying the electric quantity of the battery.
In one embodiment, as shown in fig. 2, the touch detection circuit 101 includes a conductive sheet J1, a first capacitor C1, and a touch sensing chip U1, the conductive sheet J1 is connected to an input pin of the touch sensing chip U1, and two ends of the first capacitor C1 are respectively connected to a capacitor input pin 4 of the touch sensing chip U1 and a ground.
The conductive sheet J1 is a thin conductive sheet, generally a copper sheet, which can be used to detect whether a finger or other conductive object is approaching, and the conductive sheet J1 can exist independently or be printed on a PCB. The touch-sensitive chip U1 is capacitanc touch-sensitive chip, and when sensing finger or other conducting material and being close when conducting strip J1, output switch control signal gives control circuit 102, in the embodiment of the utility model, the touch-sensitive chip U1 model is BS 801B. The first capacitance C1 is a patch capacitance for adjusting touch sensitivity. When no conductor (generally a finger) is close to the conductive sheet J1, the output pin 1 of the touch sensing chip U1 outputs a high level; when a conductor is close to the conducting strip J1, the output pin 1 of the touch sensing chip U1 outputs a low level.
In one embodiment, as shown in fig. 2, the control circuit 102 includes a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, and a first power supply 3.3V, the first power supply is connected to the power input pin 5 of the touch sensing chip U1, two ends of the first resistor R1 are respectively connected to the first power supply and the output pin 1 of the touch sensing chip U1, two ends of the second resistor R2 are respectively connected to the first power supply and the drain of the first MOS transistor Q1, the source of the first MOS transistor Q1 is grounded, the gate of the first MOS transistor Q1 is connected to the output pin 1 of the touch sensing chip U1, the gate of the second MOS transistor Q2 is connected to the drain of the first MOS transistor Q1, and the source of the second MOS transistor Q2 is grounded.
The control circuit 102 may amplify a switching signal, the first resistor R1 and the second resistor R2 are configured to pull up a voltage, when the output pin 1 of the touch sensing chip U1 outputs a high level, that is, the gate of the first MOS transistor Q1 is at a high level, the first MOS transistor Q1 is turned on, the drain of the first MOS transistor Q1 is pulled down to a low level (0V), that is, the gate of the second MOS transistor is at a low level, and the second MOS transistor Q2 is not turned on and is in a high-impedance state.
When the output pin 1 of the touch sensing chip U1 outputs a low level, that is, the gate of the first MOS transistor Q1 is at a low level, the first MOS transistor Q1 is not turned on, the voltage at the drain of the first MOS transistor Q1, that is, the gate of the second MOS transistor Q2 is equal to the first power voltage and is 3.3V, the second MOS transistor Q2 is turned on, and the drain of the second MOS transistor Q2 is pulled down to a low level (0V).
In one embodiment, as shown in fig. 2, the electric quantity detecting and displaying circuit 103 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first light emitting diode D1, a second light emitting diode D2, a third light emitting diode D3, a fourth light emitting diode D4, a first zener diode T1, a second power supply BAT +, and an operational amplifier U2, the operational amplifier U2 includes a first amplifier U2A, a second amplifier U2B, a third amplifier U2C and a fourth amplifier U2D, an anode and a cathode of the first light emitting diode D1 are respectively connected to one end of the second power supply BAT + and the third resistor R3, an anode and a cathode of the third resistor R3 are respectively connected to an output end of the second power supply BAT 2A and an output end of the fourth resistor R2, and an anode of the second light emitting diode D A and a cathode of the second light emitting diode D4 are respectively connected to an output end of the second light emitting diode BAT A One end of R4, the other end of the fourth resistor R4 is connected to the output end of the second amplifier U2B, the anode and cathode of the third led D3 are connected to the second power supply BAT + and one end of the fifth resistor R5, respectively, the other end of the fifth resistor R5 is connected to the output end of the third amplifier U2C, the anode and cathode of the fourth led D4 are connected to the second power supply BAT + and one end of the sixth resistor R6, respectively, the other end of the sixth resistor R6 is connected to the output end of the fourth amplifier U2D, the two ends of the seventh resistor R7 are connected to the second power supply BAT + and the cathode of the first voltage regulator diode T1, the anode of the first voltage regulator diode T1 is connected to the drain of the second MOS transistor Q2, and the two ends of the eighth resistor R8 are connected to the second power supply BAT + and the negative input end of the first amplifier U2A, two ends of the ninth resistor R9 are connected to a negative input terminal of the first amplifier U2A and a negative input terminal of the second amplifier U2B, two ends of the tenth resistor R10 are connected to a negative input terminal of the second amplifier U2B and a negative input terminal of the third amplifier U2C, two ends of the eleventh resistor R11 are connected to a negative input terminal of the third amplifier U2C and a negative input terminal of the fourth amplifier U2D, two ends of the twelfth resistor R12 are connected to a negative input terminal of the fourth amplifier U2D and an anode of the first zener diode T1, a positive input terminal of the first amplifier U2A is connected to a cathode of the first zener diode T1, a positive input terminal of the second amplifier U2B is connected to a cathode of the first zener diode T1, and an input terminal of the third amplifier U2C is connected to a positive input terminal of the first zener diode T1, the positive phase input end of the fourth amplifier U2D is connected with the cathode of the first voltage-stabilizing diode T1, the input end of the operational amplifier U2 is connected with the second power supply BAT +, and the output end of the operational amplifier U2 is connected with the drain electrode of the second MOS tube.
The eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 form a resistor divider circuit, the zener diode T1 and the seventh resistor R7 form a voltage regulator circuit, the operational amplifier U2 comprises the first amplifier U2A, the second amplifier U2B, the third amplifier U2C and the fourth amplifier U2D which have the same functions, when the voltage of the positive phase input terminal of the amplifier is higher than that of the negative phase input terminal, the output terminal of the amplifier is at a high level, otherwise, the output terminal of the amplifier is at a low level, and the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are mainly used for limiting the current of the light emitting diode and controlling the brightness of the light emitting diode.
When the second MOS transistor Q2 is not turned on, since the output end 12 pin of the operational amplifier U2 is connected to the drain of the second MOS transistor Q2, the output end 12 pin of the operational amplifier U2 is floating, the operational amplifier U2 does not work, and the power detection and display circuit 103 does not work; when the second MOS transistor Q2 is turned on, the pin of the output terminal 12 of the operational amplifier U2 is grounded, the operational amplifier U2 operates, and the power detection and display circuit 103 operates.
In one embodiment, the battery case of the digital camera is made of transparent or semitransparent material and is used for displaying the battery power.
Wherein, in the embodiment of the utility model provides an in, indicate remaining battery power with 4 emitting diode, it is optional, the accessible rationally arranges the resistance of each resistance in the resistance bleeder circuit, use three or five or more emitting diode to indicate remaining battery power, still can show remaining battery power with polychrome LED lamp (being emitting diode), for example green represents 100%, yellow represents 50% electric quantity, red expression is out of power, still can show remaining battery power with the display screen, for example directly show battery remaining power percentage with LED charactron or LCD liquid crystal display, still can leave a plurality of apertures through at confined battery case outward appearance, thereby make the light of LED lamp show and indicate battery power.
In one embodiment, when a human body approaches or touches the conductive sheet J1, the output pin of the touch sensing chip U1 outputs a low level, the first MOS transistor Q1 is not turned on, the second MOS transistor Q2 is turned on, and the power detection and display circuit 103 operates; or
When a human body does not approach and touch the conducting strip J1, the output pin of the touch sensing chip U1 outputs a high level, the first MOS transistor Q1 is turned on, the second MOS transistor Q2 is turned off, and the electric quantity detecting and displaying circuit 103 does not operate.
In one embodiment, the first to fourth light emitting diodes D1 to D4 are turned on when a battery voltage of the digital camera is between a first voltage and a second voltage; or
When the battery voltage of the digital camera is between the second voltage and a third voltage, the first to third light emitting diodes D1 to D3 are turned on; or
When the battery voltage of the digital camera is between the third voltage and a fourth voltage, the first light emitting diode D1 and the second light emitting diode D2 are turned on; or
When the battery voltage of the digital camera is between the fourth voltage and the fifth voltage, the first light emitting diode D1 lights; or
And when the voltage of the battery of the digital camera is lower than the fifth voltage, the digital camera does not work when the lamp is not turned on.
When the battery of the digital camera is a single battery, the first voltage is 8.4V, the second voltage is 7.69V, the third voltage is 7.19V, the fourth voltage is 6.8V, the fifth voltage is 6.4V, and when the battery is a double battery, the first voltage to the fifth voltage are half of those of the double battery.
In the embodiment of the present invention, the resistance of the eighth resistor R8 is 188.49K Ω, the resistance of the ninth resistor R9 is 6.38K, the resistance of the tenth resistor R10 is 7K, the resistance of the eleventh resistor R11 is 6.95K, the resistance of the twelfth resistor R12 is 100K, the breakdown voltage of the zener diode T1 is 2.495V, that is, the first amplifier U2A is to the voltage of the positive phase input end of the fourth amplifier U2D is 2.495V, the above voltage value and the resistance value are selected values in this embodiment, and this application does not limit the value thereof. When a human body approaches or touches the conductive sheet J1, the electric quantity detection and display circuit 103 works, and the voltage at the non-inverting input terminal of the first amplifier U2A, i.e., at the 4-pin of the operational amplifier U2, is:
the voltage at the non-inverting input terminal of the second amplifier U2B, i.e., the 6 pin of the operational amplifier U2, is:
the voltage at the non-inverting input terminal of the third amplifier U2C, i.e., the 8-pin of the operational amplifier U2, is:
the voltage at the non-inverting input terminal of the fourth amplifier U2D, i.e., the 10 pin of the operational amplifier U2, is:
when the battery is a double battery, if the battery voltage U is the samebatWhen the first voltage is 8.4V, namely full power, U102.69V > 2.495V, so the output ends of the first to fourth amplifiers U1A to U1D are all at low level, and the first to fourth light emitting diodes D1 to D4 all emit light; if the battery voltage U is presentbatIs the third voltage of 7.19V, U8＝2.5165V＞2.495V，U102.3V < 2.495V, the first to third light emitting diodes D1 to D3 emit light, and the fourth light emitting diode D4 does not emit light; if the battery voltage U is presentbatThe fourth voltage is 6.8V, U6＝2.516V＞2.495V，U82.38V < 2.495V, the first and second light emitting diodes D1 and D2 emit light, and the third and fourth light emitting diodes D3 and D4 do not emit light; if the battery is poweredPress UbatThe fifth voltage is 6.4V, then U4＝2.496＞2.495V， U62.368 < 2.495V, at which time the first light emitting diode D1 emits light and the second to fourth light emitting diodes D2 to D4 do not emit light; if the battery voltage U is presentbatLess than the fifth voltage, none of the first to fourth light emitting diodes D1 to D4 emit light, so that the remaining battery power of the digital camera can be displayed by a combination of 4 light emitting diodes.
Optionally, the power detection and display circuit 103 of the battery power display circuit 100 may be modified to display the remaining battery power through a multi-color LED lamp (i.e., a light emitting diode), or display the remaining battery power through a display screen on the battery case.
In one embodiment, the battery voltage and the battery charge of the digital camera are approximately linear when the battery voltage is between the first voltage and the third voltage, and the battery charge drops sharply when the battery voltage is less than the fifth voltage.
The change of the battery capacity is mainly related to the battery capacity, and is less related to external factors such as temperature, humidity and the like. As shown in fig. 3, when the digital camera is a single battery, the first voltage is 4.2V, the third voltage is 3.6V, the fifth voltage is 3.2V, when the battery voltage is between 3.6V and 4.2V, the battery voltage and the battery charge are approximately in a linear relationship, the battery charge is also approximately linearly decreased with the decrease of the battery voltage, when the battery voltage is about 3.6V, the battery charge is about 90%, when the battery voltage is lower than 3.6V, the battery charge starts to decrease, when the battery voltage is lower than 3.2V, the battery charge sharply decreases, at this time, the digital camera cannot be started, and therefore, 3.2V to 4.2V is used as the single battery voltage range in which the digital camera operates, and 6.4V to 8.4V is used as the dual battery voltage range in which the digital camera operates.
In one embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 are both N-channel MOS transistors.
In one possible example, the embodiment of the present invention provides a switching power supply, which includes the battery power level display circuit 100 provided in any of the above embodiments.
It is thus clear that through battery power display circuit 100 can be detecting that the human body is close to or touch the back and show the battery power on the battery case, need not to open digital camera or press mechanical button and look over the battery power, and is more convenient and fast, does not influence the picture of shooing moreover, and waterproof dustproof effectual.
It should be noted that, for the sake of simplicity, the aforementioned embodiments of the present invention are described as a series of combinations of actions, but it should be understood by those skilled in the art that the present invention is not limited by the described order of actions, because some steps can be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the present invention and its core ideas; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there may be changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The utility model provides a battery power display circuit which characterized in that is applied to digital camera, includes touch detection circuit, control circuit and power detection and display circuit, wherein:
the touch detection circuit the control circuit with the electric quantity detects and is connected in order with the display circuit, touch detection circuit is used for when detecting that the human body is close to or touches, output switch signal gives control circuit, control circuit is used for controlling whether electric quantity detects and the display circuit works, electric quantity detects and the display circuit is used for detecting and shows the battery electric quantity.
2. The battery power display circuit of claim 1, wherein the touch detection circuit comprises a conductive sheet, a first capacitor and a touch sensing chip, the conductive sheet is connected to the input pin of the touch sensing chip, and two ends of the first capacitor are respectively connected to the capacitor input pin of the touch sensing chip and the ground.
3. The battery power display circuit of claim 2, wherein the control circuit comprises a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, and a first power supply, the first power supply is connected to the power input pin of the touch sensing chip, two ends of the first resistor are respectively connected to the first power supply and the output pin of the touch sensing chip, two ends of the second resistor are respectively connected to the first power supply and the drain electrode of the first MOS transistor, the source electrode of the first MOS transistor is grounded, the gate electrode of the first MOS transistor is connected to the output pin of the touch sensing chip, the gate electrode of the second MOS transistor is connected to the drain electrode of the first MOS transistor, and the source electrode of the second MOS transistor is grounded.
4. The battery power level display circuit of claim 3, wherein the power level detection and display circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first light emitting diode, a second light emitting diode, a third light emitting diode, a fourth light emitting diode, a first voltage regulator, a second power supply, and an operational amplifier, wherein the operational amplifier comprises a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier, wherein an anode and a cathode of the first light emitting diode are connected to one end of the second power supply and one end of the third resistor, respectively, and the other end of the third resistor is connected to an output end of the first amplifier, and an anode and a cathode of the second light emitting diode are connected to one end of the second power supply and one end of the fourth resistor, respectively, the other end of the fourth resistor is connected with the output end of the second amplifier, the anode and the cathode of the third light emitting diode are respectively connected with one end of the second power supply and one end of the fifth resistor, the other end of the fifth resistor is connected with the output end of the third amplifier, the anode and the cathode of the fourth light emitting diode are respectively connected with one end of the second power supply and one end of the sixth resistor, the other end of the sixth resistor is connected with the output end of the fourth amplifier, the two ends of the seventh resistor are respectively connected with the second power supply and the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is connected with the drain electrode of the second MOS transistor, the two ends of the eighth resistor are respectively connected with the negative phase input end of the second power supply and the negative phase input end of the first amplifier, and the two ends of the ninth resistor are respectively connected with the negative phase input end of the first amplifier and the negative phase input end of the second amplifier, two ends of the tenth resistor are respectively connected with the negative phase input end of the second amplifier and the negative phase input end of the third amplifier, two ends of the eleventh resistor are respectively connected with the negative phase input end of the third amplifier and the negative phase input end of the fourth amplifier, two ends of the twelfth resistor are respectively connected with the negative phase input end of the fourth amplifier and the anode of the first voltage stabilizing diode, the positive input end of the first amplifier is connected with the cathode of the first voltage-stabilizing diode, the positive input end of the second amplifier is connected with the cathode of the first voltage-stabilizing diode, the positive-phase input end of the third amplifier is connected with the cathode of the first voltage-stabilizing diode, the positive-phase input end of the fourth amplifier is connected with the cathode of the first voltage-stabilizing diode, the input end of the operational amplifier is connected with the second power supply, and the output end of the operational amplifier is connected with the drain electrode of the second MOS tube.
5. The battery level display circuit of claim 1, wherein the portion or all of the battery housing of the digital camera is a transparent or translucent material for displaying the battery level.
6. The battery level display circuit of claim 3,
when a human body approaches or touches the conducting strip, an output pin of the touch sensing chip outputs a low level, the first MOS tube is not conducted, the second MOS tube is conducted, and the electric quantity detection and display circuit works; or
When a human body is not close to or touches the conducting strip, the output pin of the touch sensing chip outputs a high level, the first MOS tube is conducted, the second MOS tube is not conducted, and the electric quantity detection and display circuit does not work.
7. The battery level display circuit of claim 4,
when the battery voltage of the digital camera is between a first voltage and a second voltage, the first light-emitting diode to the fourth light-emitting diode are lighted; or
When the battery voltage of the digital camera is between the second voltage and a third voltage, the first light-emitting diode to the third light-emitting diode are lighted; or
When the battery voltage of the digital camera is between the third voltage and the fourth voltage, the first light-emitting diode and the second light-emitting diode are lighted; or
When the battery voltage of the digital camera is between the fourth voltage and the fifth voltage, the first light-emitting diode is lightened; or
And when the voltage of the battery of the digital camera is lower than the fifth voltage, the digital camera does not work when the lamp is not turned on.
8. The battery level display circuit of claim 7, wherein the battery voltage and the battery level are approximately linear when the battery voltage of the digital camera is between the first voltage and the third voltage, and the battery level drops sharply when the battery voltage is less than the fifth voltage.
9. The battery level display circuit according to claim 3, 4, 6, 7 or 8, wherein the first MOS transistor and the second MOS transistor are both N-channel MOS transistors.
10. A switched mode power supply, characterized in that it comprises a battery level display circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921230130.9U CN210775774U (en) | 2019-07-30 | 2019-07-30 | Battery power display circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921230130.9U CN210775774U (en) | 2019-07-30 | 2019-07-30 | Battery power display circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210775774U true CN210775774U (en) | 2020-06-16 |
Family
ID=71046552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921230130.9U Active CN210775774U (en) | 2019-07-30 | 2019-07-30 | Battery power display circuit and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210775774U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933716A (en) * | 2021-09-29 | 2022-01-14 | 深圳市昂佳科技有限公司 | Ultra-low standby power consumption nanoamp wide voltage range LED battery power indicating system |
-
2019
- 2019-07-30 CN CN201921230130.9U patent/CN210775774U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933716A (en) * | 2021-09-29 | 2022-01-14 | 深圳市昂佳科技有限公司 | Ultra-low standby power consumption nanoamp wide voltage range LED battery power indicating system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3820014A1 (en) | Multi-battery charging and discharging apparatus and mobile terminal | |
| CN103066654B (en) | Portable power source capable of intelligently controlling solar battery charging and digital display | |
| CN103761040A (en) | Mobile terminal | |
| CN108122499A (en) | A kind of display screen and its switching method | |
| CN105095117A (en) | Electronic device and camera module switching method thereof | |
| US20120013476A1 (en) | Illuminable indicator of electronic device being enabled based at least on user presence | |
| CN210775774U (en) | Battery power display circuit and switching power supply | |
| CN202488535U (en) | Mobile terminal for displaying state of electric quantity in real time | |
| CN111309135A (en) | Photosensitive control method and photosensitive control device of display screen and display device | |
| WO2015021710A1 (en) | Display device | |
| CN106900039A (en) | A kind of mobile phone display screen backlight subarea lighting method and device | |
| WO2020051930A1 (en) | Light-emitting device applicable to keyboard of notebook computer and use method therefor | |
| US8335939B2 (en) | Notebook computer | |
| CN207540594U (en) | A kind of air quality detection system | |
| CN114035702B (en) | Touch wakeup method and device of display equipment, power supply circuit and display equipment | |
| CN206422846U (en) | Display device, television set and remote control | |
| CN106817466B (en) | Electronic equipment and breathing lamp control method thereof | |
| CN104699436A (en) | Obverse split-screen display applicable to mobile device | |
| CN213305702U (en) | Earphone charging box | |
| CN205194297U (en) | AC detection circuitry and LED power supply unit | |
| CN208903232U (en) | Touch screen passive triggering device | |
| CN210016671U (en) | Key backlight circuit and key backlight device | |
| TW202145181A (en) | Optical functional device, functional panel, display device, input/output device, information processing device | |
| CN201527776U (en) | Digital OLED display brightness control circuit | |
| CN217008613U (en) | Electronic display screen type microphone label |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |