CN113872262A - Battery anti-reverse circuit and electronic temperature measuring instrument - Google Patents
Battery anti-reverse circuit and electronic temperature measuring instrument Download PDFInfo
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- CN113872262A CN113872262A CN202010621778.XA CN202010621778A CN113872262A CN 113872262 A CN113872262 A CN 113872262A CN 202010621778 A CN202010621778 A CN 202010621778A CN 113872262 A CN113872262 A CN 113872262A
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- 239000003990 capacitor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 210000001061 forehead Anatomy 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
Abstract
The invention discloses a battery anti-reverse circuit and an electronic temperature measuring instrument, wherein the battery anti-reverse circuit comprises: the battery positive terminal is used for connecting the battery positive electrode; a battery negative terminal for connecting a battery negative electrode; the device positive terminal is used for supplying power to the device; a device negative terminal for supplying power to the device; a switching device disposed between the battery positive terminal and the device positive terminal or between the battery negative terminal and the device negative terminal, the switching device configured to turn on when the positive electrode of the battery is connected to the battery positive terminal and the negative electrode of the battery is connected to the battery negative terminal, and turn off otherwise. According to the embodiment of the invention, the electronic thermometer can prevent the equipment from being irreversibly physically damaged due to the reverse connection of the dry battery, and the safety of the equipment is improved.
Description
Technical Field
The invention relates to the technical field of electronic temperature measurement, in particular to a battery anti-reflection circuit and an electronic temperature measuring instrument.
Background
With the development of electronic technology, people use more electronic temperature measuring equipment for temperature measurement at present, such as forehead temperature guns, ear temperature guns and the like, and the equipment is generally simple and convenient to use and widely applied. The electronic temperature measuring equipment generally uses dry batteries as a power supply of the equipment, and polarity connection fool-proofing treatment cannot be achieved when the batteries are connected, that is to say, the possibility of reverse connection exists between the positive electrode and the negative electrode of a main control power supply, and the power supply connected reversely can cause irreversible physical damage to a system, so that the equipment is physically unavailable.
Disclosure of Invention
The present invention has been made to solve at least one of the above problems. Specifically, an aspect of the present invention provides a battery reverse preventing circuit, including:
the battery positive terminal is used for connecting the battery positive electrode;
a battery negative terminal for connecting a battery negative electrode;
the device positive terminal is used for supplying power to the device;
a device negative terminal for supplying power to the device;
a switching device disposed between the battery positive terminal and the device positive terminal or between the battery negative terminal and the device negative terminal, the switching device configured to turn on when the positive electrode of the battery is connected to the battery positive terminal and the negative electrode of the battery is connected to the battery negative terminal, and turn off otherwise.
In an embodiment of the invention, the switching device comprises a PMOS device disposed between the battery positive terminal and the device positive terminal.
In an embodiment of the present invention, a drain of the PMOS device is connected to the positive terminal of the battery, a source of the PMOS device is connected to the positive terminal of the device, and a gate of the PMOS device is grounded through a current limiting resistor.
In an embodiment of the present invention, the method further includes:
and the anode of the voltage-stabilizing tube is connected with the grid electrode of the PMOS device, and the cathode of the voltage-stabilizing tube is connected with the source electrode of the PMOS device.
In an embodiment of the present invention, the method further includes:
and one end of the storage capacitor is grounded, and the other end of the storage capacitor is connected with the source electrode of the PMOS device.
In an embodiment of the invention, the switching device comprises an NMOS device disposed between the battery negative terminal and the device negative terminal. .
In another aspect, the invention provides an electronic thermometer which comprises a battery anti-reverse circuit according to the embodiment of the invention.
In an embodiment of the invention, the battery protection circuit further comprises a controller and a battery, and the battery protection circuit is arranged between the battery and the controller.
According to the battery anti-reverse circuit and the electronic thermometer, the switch device is arranged between the positive terminal of the battery and the positive terminal of the equipment or between the negative terminal of the battery and the negative terminal of the equipment, the switch device is configured to be connected between the positive electrode of the battery and the positive terminal of the battery, the negative electrode of the battery is connected with the negative terminal of the battery and is conducted, otherwise, the switch device is turned off, so that the equipment can be normally supplied with power when the battery is in forward connection, and when the battery is in reverse connection, the equipment is equivalent to a battery-free state because the switch device is turned off, and the physical damage of the equipment caused by the reverse connection of the battery can be avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 shows a schematic block diagram of a current electronic thermometer;
FIG. 2 shows a schematic block diagram of an electronic thermometer according to an embodiment of the invention;
fig. 3 shows a schematic diagram of a battery anti-reverse circuit according to an embodiment of the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on …," "directly adjacent to …," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, a detailed structure will be set forth in the following description in order to explain the present invention. Alternative embodiments of the invention are described in detail below, however, the invention may be practiced in other embodiments that depart from these specific details.
First, a structure of a conventional electronic thermometer will be described with reference to fig. 1. As shown in fig. 1, the conventional electronic thermometer 100, such as a forehead temperature gun, an ear temperature gun, etc., generally includes a main controller 10, a sensor 11, an analog-to-digital converter 12, a key array 13, a display screen 14, a prompting unit 15, and a battery 16, wherein the display screen 14, the prompting unit 15, and the main controller 10 are physically connected to exist as an output part of the device; the key array 13, the sensor 11 and the analog-digital converter 12 are also connected with the master control 10 as the input part of the equipment; the battery 16 is also connected to the master control 10 as the device's overall power supply input. The battery 16 is typically a dry cell or button cell battery for providing a stable voltage source to the device. The main controller 10 may employ a control device, such as a microcontroller, for controlling the temperature measurement function of the electronic temperature measuring instrument 100 and other functions. In general, the master 10 is used to implement the following controls: 1, receiving the simulation data output by the temperature sensor 11, and calculating the current actual temperature value according to the simulation temperature data. And 2, monitoring the action of the key array 13, and accordingly realizing temperature tests under different application scenes according to different key states, such as internal temperature test, body surface temperature test, object temperature measurement and the like. And 3, controlling the data output of the display screen 14 to display the test result. 4, a control and prompting unit 15, such as a multi-color indicator light and/or a buzzer, is used for displaying the test result and the level thereof. The sensor 11 is, for example, an infrared temperature sensor, and is configured to sense external temperature change and output the temperature change amount as an electrical signal, that is, generate an electrical signal based on the temperature change. The analog-to-digital converter 12 is configured to perform quantization processing on the analog data output by the sensor 11, and output the analog data to the main controller 10 for processing. In some application scenarios, the device of the analog-to-digital converter 12 may be omitted, and the output of the sensor 11 is directly connected to the master control 10, i.e. analog-to-digital conversion is performed inside the master control 10.
As mentioned above, because this kind of products generally use dry cell as the power supply of the apparatus, and can't achieve the connection of the polarity and prevent the slow-witted processing when the battery is connected, that is to say there is the possibility that the reverse connection exists between the power positive and negative poles of the master control, and the power of the reverse connection will cause the physical damage of the irreversible to the system, thus cause the apparatus physical to be unusable.
Fig. 2 shows a schematic block diagram of an electronic thermometer according to an embodiment of the present invention. As shown in fig. 2, the electronic temperature measuring instrument 100 according to the embodiment of the present invention includes a main control 20, a sensor 21, an analog-to-digital converter 22, a key array 23, a display screen 24, a prompt unit 25, a battery 26, and a battery anti-reverse circuit 27. The functions and connection relationships of the main controller 20, the sensor 21, the analog-to-digital converter 22, the key array 23, the display screen 24, the prompting unit 25, and the battery 26 are similar to those described above, and are not described herein again.
A battery anti-reverse circuit 27 is disposed between the battery 26 and the main control 20, and includes a battery positive terminal for connecting the battery positive terminal; a battery negative terminal for connecting a battery negative electrode; the device positive terminal is used for supplying power to the device; a device negative terminal for supplying power to the device; a switching device disposed between the battery positive terminal and the device positive terminal or between the battery negative terminal and the device negative terminal, the switching device configured to turn on when the positive electrode of the battery is connected to the battery positive terminal and the negative electrode of the battery is connected to the battery negative terminal, and turn off otherwise. Because the switch device is configured to be connected with the positive terminal of the battery at the positive pole of the battery, the negative pole of the battery is connected with the negative terminal of the battery, the switch device is switched on, and the switch device is switched off otherwise, the device can be normally powered when the battery is in forward connection, and when the battery is in reverse connection, the device is equivalent to a battery-free state because the switch device is switched off, and the physical damage of the device caused by reverse connection of the battery can be avoided.
Illustratively, in embodiments of the present invention, the switching device comprises a PMOS device or an NMOS device. The battery anti-reverse circuit according to the embodiment of the invention is described in detail below with reference to fig. 3 by taking a PMOS device as an example.
As shown IN fig. 3, the battery reverse preventing circuit according to the embodiment of the present invention includes a battery positive terminal PWR, a battery negative terminal GND, an apparatus positive terminal PWR _ IN, an apparatus negative terminal GND _ IN, a switching device Q1, a resistor R1, a voltage regulator tube D1, and a storage capacitor C1, wherein the resistor R2 is shown IN the circuit shown IN fig. 3 as an equivalent resistance of an apparatus power consuming unit.
The battery positive terminal PWR is used for connecting a battery positive electrode, the battery negative terminal GND is used for connecting a battery negative electrode, the device positive terminal PWR _ IN is used for a positive terminal for supplying power to the device, the device negative terminal GND _ IN is used for a negative terminal for supplying power to the device, and the switching device Q1 is arranged between the battery positive terminal PWR and the device positive terminal PWR _ IN.
IN this embodiment, the switching device Q1 is a PMOS device, the drain D of the switching device Q1 is connected to the battery positive terminal PWR, the source S of the switching device Q1 is connected to the device positive terminal PWR _ IN, and the gate G of the switching device Q1 is grounded through a current limiting resistor R1. The anode of the voltage regulator tube D1 is connected with the gate G of the switching device Q1, and the cathode is connected with the source S of the switching device Q1. One end of the storage capacitor C1 is grounded, and the other end is connected with the source S of the switching device Q1.
The principle of the battery anti-reverse circuit of the embodiment is as follows: when the voltage of the positive terminal PWR of the battery is higher than the voltage of the negative terminal GND of the battery, i.e., the battery is connected IN the positive direction, since Vgs of the switching device Q1 is a negative-going voltage difference, conduction is made between the drain D and the source S of the switching device Q1, and therefore, a positive voltage is also present between the positive terminal PWR _ IN of the device and the negative terminal GND _ IN of the device, i.e., the voltage difference between PWR _ IN and GND _ IN and the voltage difference between PWR and GND are consistent IN direction and magnitude. When the voltage of the positive electrode PWR of the battery is lower than the voltage of the negative electrode terminal GND of the battery, namely the battery is reversely connected, as Vgs of the switching device Q1 is a forward voltage difference, the drain electrode D and the source electrode S of the switching device Q1 are turned off, and the three-point potentials of the negative electrode terminal GND of the battery, the negative electrode terminal GND _ IN of the device and the positive electrode terminal PWR _ IN of the device are equal to each other on the potential, the voltage difference between the terminal PWR _ IN and the terminal GND _ IN is zero, so that the voltage difference of the main control power supply is zero, a battery-free state is similar, and the device is prevented from being physically damaged.
The resistor R1 is arranged between the gate G of the switching device Q1 and the ground, and the current input to the gate G of the switching device Q1 is limited through the resistor R1, so that the phenomenon that the switching device Q1 is damaged due to overlarge current is avoided.
The voltage regulator tube D1 is arranged between the grid G of the switching device Q1 and the source S of the switching device Q1, the voltage which is input to the positive electrode terminal PWR _ IN of the equipment and the negative electrode terminal GND _ IN of the equipment can be stably input through the voltage regulator tube D1, and the influence of overlarge voltage fluctuation on the normal operation of the equipment is avoided.
The storage capacitor C1 is disposed between the positive terminal PWR _ IN of the device and ground, and a certain amount of power can be stored through the storage capacitor C1, so that the device is supplied with supplementary power when the device temporarily requires a large current to supply the large current.
It should be understood that the above-described battery anti-reverse circuit is only an example, and the present invention may construct various types of anti-reverse circuits based on similar principles, which are included in the scope of the present invention. For example, the switching device may be an NMOS device, and in this case, the NMOS device is disposed between the battery negative terminal and the device negative terminal, which may achieve a similar effect.
According to the battery anti-reverse circuit and the electronic thermometer, the switch device is arranged between the positive terminal of the battery and the positive terminal of the equipment or between the negative terminal of the battery and the negative terminal of the equipment, the switch device is configured to be connected between the positive terminal of the battery and the positive terminal of the battery, the negative terminal of the battery is connected with the negative terminal of the battery, the battery is conducted, otherwise, the battery is turned off, so that the equipment can be normally supplied with power when the battery is in forward connection, and when the battery is in reverse connection, the equipment is equivalent to a battery-free state due to the fact that the switch device is turned off, and physical damage to the equipment caused by reverse connection of the battery can be avoided.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the foregoing illustrative embodiments are merely exemplary and are not intended to limit the scope of the invention thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be construed to reflect the intent: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (8)
1. A battery anti-reverse circuit, comprising:
the battery positive terminal is used for connecting the battery positive electrode;
a battery negative terminal for connecting a battery negative electrode;
the device positive terminal is used for supplying power to the device;
a device negative terminal for supplying power to the device;
a switching device disposed between the battery positive terminal and the device positive terminal or between the battery negative terminal and the device negative terminal, the switching device configured to turn on when the positive electrode of the battery is connected to the battery positive terminal and the negative electrode of the battery is connected to the battery negative terminal, and turn off otherwise.
2. The battery protection circuit of claim 1, wherein the switching device comprises a PMOS device disposed between the battery positive terminal and the device positive terminal.
3. The battery anti-reverse circuit according to claim 2, wherein a drain of the PMOS device is connected to the battery positive terminal, a source of the PMOS device is connected to the device positive terminal, and a gate of the PMOS device is grounded through a current-limiting resistor.
4. The battery protection circuit according to claim 3, further comprising:
and the anode of the voltage-stabilizing tube is connected with the grid electrode of the PMOS device, and the cathode of the voltage-stabilizing tube is connected with the source electrode of the PMOS device.
5. The battery protection circuit according to claim 3, further comprising:
and one end of the storage capacitor is grounded, and the other end of the storage capacitor is connected with the source electrode of the PMOS device.
6. The battery protection circuit of claim 1, wherein the switching device comprises an NMOS device disposed between the battery negative terminal and the device negative terminal.
7. An electronic thermometer comprising the battery anti-kickback circuit of any one of claims 1-6.
8. The electronic thermometer of claim 7 further comprising a controller and a battery, said battery anti-kickback circuit being disposed between said battery and said controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621778.XA CN113872262A (en) | 2020-06-30 | 2020-06-30 | Battery anti-reverse circuit and electronic temperature measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621778.XA CN113872262A (en) | 2020-06-30 | 2020-06-30 | Battery anti-reverse circuit and electronic temperature measuring instrument |
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| Publication Number | Publication Date |
|---|---|
| CN113872262A true CN113872262A (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010621778.XA Pending CN113872262A (en) | 2020-06-30 | 2020-06-30 | Battery anti-reverse circuit and electronic temperature measuring instrument |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1498998A1 (en) * | 2003-07-16 | 2005-01-19 | Dialog Semiconductor GmbH | Protection switch with reverse voltage protection |
| CN104124669A (en) * | 2013-04-26 | 2014-10-29 | 海洋王（东莞）照明科技有限公司 | Anti-reverse connection protection circuit and lighting device |
| CN111071049A (en) * | 2020-01-16 | 2020-04-28 | 苏州海格新能源汽车电控系统科技有限公司 | Voltage output reverse connection prevention circuit |
-
2020
- 2020-06-30 CN CN202010621778.XA patent/CN113872262A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1498998A1 (en) * | 2003-07-16 | 2005-01-19 | Dialog Semiconductor GmbH | Protection switch with reverse voltage protection |
| CN104124669A (en) * | 2013-04-26 | 2014-10-29 | 海洋王（东莞）照明科技有限公司 | Anti-reverse connection protection circuit and lighting device |
| CN111071049A (en) * | 2020-01-16 | 2020-04-28 | 苏州海格新能源汽车电控系统科技有限公司 | Voltage output reverse connection prevention circuit |
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