CN109991462A - Voltage detecting circuit, method and system - Google Patents
Voltage detecting circuit, method and system Download PDFInfo
- Publication number
- CN109991462A CN109991462A CN201910279489.3A CN201910279489A CN109991462A CN 109991462 A CN109991462 A CN 109991462A CN 201910279489 A CN201910279489 A CN 201910279489A CN 109991462 A CN109991462 A CN 109991462A
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- comparator
- circuit
- input end
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 104
- 238000010586 diagram Methods 0.000 description 13
- 208000028659 discharge Diseases 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
This application provides a kind of voltage detecting circuits, method and system, are related to the technical field of electronic circuit, including voltage source, voltage limit module, clamp circuit module and comparator module；Clamp circuit module is provided in the voltage detecting circuit that the application proposes, the clamp circuit module generates electric current under the action of the voltage that voltage limit module inputs, and the electric current is transmitted to comparator module, change the input voltage of comparator module, it is adjusted by the electric current generated to the clamp circuit module, it can change the maximum voltage value that comparator module receives, so that the ratio of ceiling voltage and minimum voltage is adjustable, the voltage detecting circuit that the application proposes can be adapted for different circuits, use scope is flexible, and practicability is higher.
Description
Technical Field
The present application relates to the field of electronic circuits, and in particular, to a voltage detection circuit, method and system.
Background
Because the input voltage of the circuit has an unstable phenomenon, various problems can be generated when the circuit is used, for example, too high voltage may cause burning of components inside the circuit, or too low voltage may cause abnormal operation of components in the circuit, and so on.
In the prior art, a voltage source is connected with a comparator through a resistor of a voltage detection circuit, and then the voltage detection circuit detects the voltage input by the voltage source, but when the voltage detection circuit is selected to detect the input voltage, because the resistance value of the resistor is fixed, the highest voltage value and the lowest voltage value input into the comparator circuit are fixed, the ratio of the highest voltage to the lowest voltage cannot be adjusted, so that the voltage detection circuit cannot be applied to different circuits, the application range of the voltage detection circuit is inflexible, and the practicability is low.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a voltage detection circuit, a method and a system, so as to solve the technical problems that when the voltage detection circuit detects an input voltage, a maximum voltage value and a minimum voltage value input to a comparator circuit are fixed, and a ratio of the maximum voltage to the minimum voltage cannot be adjusted, so that the voltage detection circuit cannot be applied to different circuits, and the voltage detection circuit is inflexible in use range and low in practicability.
In a first aspect, an embodiment of the present application provides a voltage detection circuit, including: the circuit comprises a voltage source, a voltage limiting module, a clamping circuit module and a comparator module;
the output end of the voltage source is connected with the input end of the voltage limiting module, the output end of the voltage limiting module is connected with the input end of the clamping circuit module, the output end of the clamping circuit module is connected with the input end of the comparator module, and the output end of the comparator module is connected with the input end of an external circuit;
the voltage source is used for providing voltage for the voltage limiting module;
the voltage limiting module is used for limiting the voltage output by the voltage source and inputting the limited voltage to the clamping circuit;
the clamping circuit module is used for generating current under the action of the voltage input by the voltage limiting module and transmitting the current to the comparator module;
and the comparator module is used for comparing the voltage input by the clamping circuit module with the set working voltage and outputting the comparison result to the external circuit.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where the clamp circuit module includes: a comparison unit and a switch unit;
the output end of the comparison unit is connected with the input end of the switch unit, and the input end of the comparison unit is respectively connected with the output end of the voltage limiting module and the input end of the comparator module;
the output end of the switch unit is connected with the output end of the voltage limiting module and the input end of the comparator module.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, where the comparing unit includes: a first operational amplifier;
the non-inverting input end of the first operational amplifier is connected with the input end of the comparator module, the output end of the first operational amplifier is connected with the input end of the switch unit, and the output end of the switch unit is respectively connected with the output end of the voltage limiting module, the input end of the comparator module and the non-inverting input end of the first operational amplifier.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, where the switch unit includes: a switching triode;
the base electrode of the switching triode is connected with the output end of the first operational amplifier;
and the emitter of the switching triode is grounded, and the collector of the switching triode is respectively connected with the output end of the voltage limiting module, the input end of the comparator module and the non-inverting input end of the first operational amplifier.
With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, where the voltage limiting module includes: a first resistor and a second resistor;
the first end of the first resistor is connected with the voltage source, and the second end of the first resistor is respectively connected with the first end of the second resistor and the input end of the clamping circuit module;
and the second end of the second resistor is grounded.
With reference to the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where the comparator module includes: a first comparator and a second comparator;
the non-inverting input end of the first comparator is respectively connected with the non-inverting input end of the second comparator and the output end of the clamping circuit module;
a second voltage comparison value is arranged at the inverting input end of the second comparator, a first voltage comparison value is arranged at the inverting input end of the first comparator, and the second voltage comparison value is larger than the first voltage comparison value;
the output end of the first comparator and the output end of the second comparator are respectively connected with an external circuit.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where an operating voltage of the clamp circuit module is greater than the first voltage comparison value and less than the second voltage comparison value.
In a second aspect, an embodiment of the present application further provides a voltage detection method, including:
receiving the voltage output by the voltage limiting module;
judging whether the voltage is greater than a preset working voltage or not;
if so, a current is generated and transmitted to the comparator module.
In a third aspect, an embodiment of the present application further provides a voltage detection system, including: the voltage detection circuit and the voltage protection circuit according to the first aspect;
the output end of a comparator module of the voltage detection circuit is connected with the input end of the voltage protection circuit;
the voltage detection circuit is used for detecting the input voltage and inputting the detection result to the voltage protection circuit;
and the voltage protection circuit is used for receiving the detection result and adjusting the working voltage of the voltage detection system according to the detection result.
The application provides a voltage detection circuit, includes: the circuit comprises a voltage source, a voltage limiting module, a clamping circuit module and a comparator module; the output end of the voltage source is connected with the input end of the voltage limiting module, the output end of the voltage limiting module is connected with the input end of the clamping circuit module, the output end of the clamping circuit module is connected with the input end of the comparator module, and the output end of the comparator module is connected with the input end of an external circuit; the voltage source provides voltage for the voltage limiting module, the voltage limiting module limits the received voltage and inputs the limited voltage to the clamping circuit module, the clamping circuit module generates current and transmits the current to the comparator module, and the comparator module compares the voltage input by the clamping circuit module with the set working voltage and outputs the comparison result to an external circuit.
The voltage detection circuit provided by the application is provided with the clamping circuit module, the clamping circuit module generates current under the action of the voltage input by the voltage limiting module and transmits the current to the comparator module, the input voltage of the comparator module is changed, the highest voltage value received by the comparator module can be changed by adjusting the current generated by the clamping circuit module, and further the ratio of the highest voltage to the lowest voltage can be adjusted, the voltage detection circuit provided by the application can be suitable for different circuits, the application range is flexible, the practicability is high, the situation that when the voltage detection circuit in the prior art detects the input voltage, the highest voltage value and the lowest voltage value input to the comparator circuit are fixed, the ratio of the highest voltage to the lowest voltage cannot be adjusted, and the voltage detection circuit cannot be suitable for different circuits is relieved, the application range of the voltage detection circuit is not flexible, and the practicability is low.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural diagram of a voltage detection circuit according to an embodiment of the present disclosure;
fig. 2 is a block diagram of another voltage detection circuit provided in an embodiment of the present application;
fig. 3 is a block diagram of another voltage detection circuit provided in an embodiment of the present application;
fig. 4 is a block diagram of another voltage detection circuit provided in the embodiment of the present application;
fig. 5 is a circuit diagram of a voltage detection circuit according to an embodiment of the present disclosure;
fig. 6 is a signal waveform diagram of a voltage detection circuit according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a voltage detection method according to an embodiment of the present application;
fig. 8 is a block diagram of a voltage detection system according to an embodiment of the present disclosure.
Reference numerals:
11-a voltage source; 12-a voltage limiting module; 13-a clamp circuit module; 14-a comparator module; 121-a first resistance; 122-a second resistance; 131-a comparison unit; 132-a switching unit; 141-a first comparator; 142-a second comparator; 21-a first operational amplifier; 22-a switching transistor; 81-voltage detection circuit; 82-voltage protection circuit.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, in the prior art, the voltage source is connected with the comparator through the resistance of the voltage detection circuit, and then the voltage detection circuit detects the voltage input by the voltage source, but when the voltage detection circuit is selected to detect the input voltage, because the resistance of the resistance is fixed, the highest voltage value and the lowest voltage value input to the comparator circuit are fixed, the ratio of the highest voltage to the lowest voltage cannot be adjusted, so that the voltage detection circuit cannot be applied to different circuits, the application range of the voltage detection circuit is inflexible, and the practicability is low. Based on this, according to the voltage detection circuit, the method and the system provided by the embodiment of the application, the highest voltage value received by the comparator module can be changed by adjusting the current generated by the clamping circuit module, so that the ratio of the highest voltage to the lowest voltage can be adjusted, the voltage detection circuit can be suitable for different circuits, the application range is flexible, and the practicability is high.
For the convenience of understanding the present embodiment, a voltage detection circuit disclosed in the embodiments of the present application will be described in detail first.
The first embodiment is as follows:
the embodiment of the application provides a voltage detection circuit, includes: the voltage source 11, the voltage limiting module 12, the clamping circuit module 13, and the comparator module 14 are shown in fig. 1, which is a block diagram of a voltage detection circuit.
As shown in fig. 1, the output terminal of the voltage source 11 is connected to the input terminal of the voltage limiting module 12, the output terminal of the voltage limiting module 12 is connected to the input terminal of the clamping circuit module 13, the output terminal of the clamping circuit module 13 is connected to the input terminal of the comparator module 14, and the output terminal of the comparator module 14 is connected to the input terminal of the external circuit.
A voltage source 11 for providing a voltage to the voltage limiting module 12; the voltage source 11 may be an ac voltage source.
And a voltage limiting module 12, configured to limit the voltage output by the voltage source 11, and input the limited voltage to the clamping circuit module 13.
And the clamping circuit module 13 is used for generating current under the action of the voltage input by the voltage limiting module 12 and transmitting the current to the comparator module 14.
And a comparator module 14 for comparing the voltage input by the clamp circuit module 13 with the set operating voltage and outputting the comparison result to an external circuit.
The embodiment of the application provides a voltage detection circuit, and it includes: the circuit comprises a voltage source, a voltage limiting module, a clamping circuit module and a comparator module; the voltage detection circuit can be suitable for different circuits, has flexible use range and high practicability, and relieves the problem that when the voltage detection circuit in the prior art detects the input voltage, the highest voltage value and the lowest voltage value which are input into the comparator circuit are fixed, the ratio of the highest voltage to the lowest voltage cannot be adjusted, so that the voltage detection circuit cannot be suitable for different circuits, the application range of the voltage detection circuit is not flexible, and the practicability is low.
In one possible embodiment, as shown in fig. 2, the voltage limiting module 12 includes: a first resistor 121 and a second resistor 122; a first end of the first resistor 121 is connected to the output end of the voltage source 11, and a second end of the first resistor 121 is connected to a first end of the second resistor 122 and the input end of the clamp circuit module 13, respectively; a second terminal of the second resistor 122 is connected to ground. The resistance values of the first resistor and the second resistor are set through the first comparison value and the second comparison value of the comparator module, the current generated by the clamping circuit module, and the highest voltage and the lowest voltage of the voltage source.
In one possible embodiment, as shown in fig. 3, the clamping circuit module 13 includes: a comparing unit 131 and a switching unit 132; the output end of the comparing unit 131 is connected to the input end of the switching unit 132, and the input end of the comparing unit 131 is connected to the output end of the voltage limiting module 12 and the input end of the comparator module 14, respectively; an output of the switching unit 132 is connected to an output of the voltage limiting module 12 and to an input of the comparator module 14.
As shown in fig. 3, in the embodiment of the present application, it may be determined whether the switch unit 132 is in an on state or an off state according to the signal output by the output terminal of the comparison unit 131, so as to control the state of the clamp circuit module 13 to be an operating state or an inoperative state.
Illustratively, the comparing unit 131 includes: a first operational amplifier 21; the non-inverting input terminal of the first operational amplifier 21 is connected to the input terminal of the comparator module 14, the output terminal of the first operational amplifier 21 is connected to the input terminal of the switch unit 132, and the output terminal of the switch unit 132 is connected to the output terminal of the voltage limiting module 12, the input terminal of the comparator module 14, and the non-inverting input terminal of the first operational amplifier 21. The inverting input terminal of the first operational amplifier 21 is provided with an inverting voltage value, which is the working voltage of the clamp circuit module.
Illustratively, the switching unit 132 includes: a switching transistor 22; the base of the switching transistor 22 is connected with the output end of the first operational amplifier 21; the emitter of the switching transistor 22 is grounded, and the collector of the switching transistor 22 is connected to the output of the voltage limiting module 12, the input of the comparator module 14, and the non-inverting input of the first operational amplifier 21, respectively.
The voltage received by the non-inverting input end of the first operational amplifier is compared with the inverting voltage value set by the inverting input end, if the voltage received by the non-inverting input end is greater than the inverting voltage value set by the inverting input end, the output end of the first operational amplifier outputs a first signal, the switching triode is in a starting state after receiving the first signal, and then the clamping circuit module is in a working state. Specifically, the switching triode is determined to be in an on state or an off state according to a signal output by the output end of the first operational amplifier, and then the state of the clamping circuit module is controlled to be working or non-working.
In one possible embodiment, as shown in fig. 4, the comparator module 14 includes: a first comparator 141 and a second comparator 142; the non-inverting input end of the first comparator 141 is connected to the non-inverting input end of the second comparator 142 and the output end of the clamp circuit module 13; the inverting input terminal of the second comparator 142 is provided with a second voltage comparison value, and the inverting input terminal of the first comparator 141 is provided with a first voltage comparison value; the output terminal of the first comparator 141 and the output terminal of the second comparator 142 are respectively connected to an external circuit, wherein the second voltage comparison value is greater than the first voltage comparison value. Meanwhile, the first voltage comparison value and the second voltage comparison value can be set according to actual needs.
In a possible embodiment, the operating voltage of the clamping circuit module 13 is greater than the first voltage comparison value and less than the second voltage comparison value, and the operating voltage of the clamping circuit module can be set as required when the above conditions are met. Preferably, the operating voltage of the clamping circuit module may be set to be a middle value between the first voltage comparison value and the second voltage comparison value. For example, if the first voltage comparison value is 2 volts and the second voltage comparison value is 3 volts, the operating voltage of the clamping circuit module 13 may be 2.5 volts. If the operating voltage of the clamping circuit module 13 is set to 2.1 v, the requirement for the precision of the voltage detection circuit is high, if the precision of the voltage detection circuit cannot meet the requirement, the clamping circuit module will be caused to generate errors, and when the operating voltage of the clamping circuit module does not reach 2.1 v, the clamping circuit module starts to work.
Illustratively, referring to fig. 5, fig. 5 is a circuit diagram of a voltage detection circuit, in which an output terminal of a voltage source is connected to a first terminal of a first resistor, a second terminal of the first resistor is respectively connected to a first terminal of a second resistor, a collector of a switching transistor, and a non-inverting input terminal of a first operational amplifier, a second terminal of the second resistor is grounded, a base of the switching transistor is connected to an output terminal of the first operational amplifier, an emitter of the switching transistor is grounded, and a non-inverting input terminal of the first operational amplifier is connected to a non-inverting input terminal of a first comparator and a non-inverting input terminal of a second comparator. Wherein, VMIs the voltage value of the voltage source, R1Is the resistance value of the first resistor, R2Is the resistance value of the second resistor, Vref1Is a first voltage comparison value, Vref2Is a second voltage comparison value, VoffAn inverted voltage value, V, set for the inverting input of the first operational amplifieroff＝Vref1+Voffset，VoffsetIs a voltage compensation value.
Illustratively, referring to fig. 6, a signal waveform diagram of a voltage detection circuit is shown, wherein ① is the voltage detection circuit without a clamp circuit module at VSpin② waveform diagram of voltage signal measured at terminal, after setting clamping circuit module in voltage detection circuit, at VSpinWaveform diagram of the voltage signal measured at the terminals. As can be seen from fig. 5 and 6, after the clamping circuit module is set, when the clamping circuit module is in an operating state, the first operational amplifier generates a current, so that VS is generatedpinThe voltage signal of end changes, through setting up the electric current that generates, has realized setting up the voltage that the comparator module received for the ratio of maximum voltage and minimum voltage can be adjusted, and then makes voltage detection circuit can be applicable to different circuits, and application range is nimble, and the practicality is higher.
As shown in FIG. 5, when the voltage value of the non-inverting input terminal of the first operational amplifier is less than VoffAt this time, the switching transistor is in a turned-off state, and the clamping circuit module is in a non-operating state, as can be seen from fig. 5,when the voltage value of the non-inverting input end of the first operational amplifier is larger than VoffWhen the switch triode is in an on state, the clamping circuit module starts to work to generate current I0As can be seen from the circuit diagram of fig. 5,wherein,is the minimum value of the output voltage of the voltage source,is the maximum value of the voltage source output voltage. As can be derived from the above-mentioned formula,therefore, it is possible to compare the voltage value V with the first comparison voltage value Vref1A second comparison voltage value Vref2Current I generated by clamping circuit module0And the maximum value of the output voltage of the voltage sourceMinimum value of voltage source output voltageDetermining a first resistance value R1And a second resistance value R2。
Example two:
on the basis of the above embodiments, referring to fig. 7, an embodiment of the present application further provides a voltage detection method, including:
s401, receiving the voltage output by the voltage limiting module.
S402, judging whether the voltage is larger than a preset working voltage or not.
And S403, if so, generating a current and transmitting the current to the comparator module.
The voltage detection method provided by the embodiment of the application is applied to the voltage detection circuit in the first embodiment, whether the received voltage is greater than the preset working voltage or not is judged, if yes, current is generated and transmitted to the comparator module, the highest voltage value received by the comparator module is changed, and the highest voltage value and the ratio of the highest voltage to the lowest voltage can be adjusted through the voltage detection method.
Example three:
on the basis of the first embodiment, referring to fig. 8, an embodiment of the present application further provides a voltage detection system, including: the voltage detection circuit 81 and the voltage protection circuit 82 described in the first embodiment; the voltage detection circuit 81 is connected with the voltage protection circuit 82;
a voltage detection circuit 81 for detecting an input voltage and inputting a detection result to the voltage protection circuit; and the voltage protection circuit 82 is used for receiving the detection result and adjusting the working voltage of the voltage detection system according to the detection result.
Specifically, when the detection result output by the voltage detection circuit is an under-voltage state, that is, the voltage value received by the comparator module is smaller than the first comparison value, and the duration time meets the preset time condition, the voltage protection circuit starts the under-voltage protection processing to stop the voltage detection system, and after the first time value is stopped, the voltage detection system stops the operation of the operating voltage VDDPerforming discharge treatment, or performing self-discharge treatment at working voltage till workingAfter the voltage value reaches the undervoltage lock out (UVLO), the voltage detection system is restarted.
Further, when the detection result output by the voltage detection circuit is in an overvoltage state, that is, the voltage value received by the comparator module is greater than the second comparison value, the voltage protection circuit starts overvoltage protection processing to stop the voltage detection system, and after the voltage detection system stops the first time value, the voltage detection system stops working voltage VDDAnd performing discharge treatment or performing self-discharge treatment on the working voltage until the working voltage reaches UVLO, and restarting the voltage detection system.
The voltage detection system that this application embodiment provided detects input voltage's value through voltage detection circuit to the output detects the result, and according to the detection result of voltage detection circuit output, adjusts voltage detection system's operating voltage through voltage protection circuit, has avoided voltage detection system because of the improper damage that causes of input voltage, has improved voltage detection system's security.
In addition, in the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and 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 devices or units through some communication interfaces, and may be in an electrical, mechanical 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 application 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 functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A voltage detection circuit, comprising: the circuit comprises a voltage source, a voltage limiting module, a clamping circuit module and a comparator module;
the output end of the voltage source is connected with the input end of the voltage limiting module, the output end of the voltage limiting module is connected with the input end of the clamping circuit module, the output end of the clamping circuit module is connected with the input end of the comparator module, and the output end of the comparator module is connected with the input end of an external circuit;
the voltage source is used for providing voltage for the voltage limiting module;
the voltage limiting module is used for limiting the voltage output by the voltage source and inputting the limited voltage to the clamping circuit module;
the clamping circuit module is used for generating current under the action of the voltage input by the voltage limiting module and transmitting the current to the comparator module;
and the comparator module is used for comparing the voltage input by the clamping circuit module with the set working voltage and outputting the comparison result to the external circuit.
2. The voltage detection circuit of claim 1, wherein the clamp circuit module comprises: a comparison unit and a switch unit;
the output end of the comparison unit is connected with the input end of the switch unit, and the input end of the comparison unit is respectively connected with the output end of the voltage limiting module and the input end of the comparator module;
the output end of the switch unit is connected with the output end of the voltage limiting module and the input end of the comparator module.
3. The voltage detection circuit according to claim 2, wherein the comparison unit includes: a first operational amplifier;
the non-inverting input end of the first operational amplifier is connected with the input end of the comparator module, the output end of the first operational amplifier is connected with the input end of the switch unit, and the output end of the switch unit is respectively connected with the output end of the voltage limiting module, the input end of the comparator module and the non-inverting input end of the first operational amplifier.
4. The voltage detection circuit according to claim 3, wherein the switching unit includes: a switching triode;
the base electrode of the switching triode is connected with the output end of the first operational amplifier;
and the emitter of the switching triode is grounded, and the collector of the switching triode is respectively connected with the output end of the voltage limiting module, the input end of the comparator module and the non-inverting input end of the first operational amplifier.
5. The voltage detection circuit of claim 1, wherein the voltage limiting module comprises: a first resistor and a second resistor;
the first end of the first resistor is connected with the voltage source, and the second end of the first resistor is respectively connected with the first end of the second resistor and the input end of the clamping circuit module;
and the second end of the second resistor is grounded.
6. The voltage detection circuit of claim 1, wherein the comparator module comprises: a first comparator and a second comparator;
the non-inverting input end of the first comparator is respectively connected with the non-inverting input end of the second comparator and the output end of the clamping circuit module;
a second voltage comparison value is arranged at the inverting input end of the second comparator, a first voltage comparison value is arranged at the inverting input end of the first comparator, and the second voltage comparison value is larger than the first voltage comparison value;
the output end of the first comparator and the output end of the second comparator are respectively connected with an external circuit.
7. The voltage detection circuit of claim 6, wherein the operating voltage of the clamping circuit module is greater than the first voltage comparison value and less than the second voltage comparison value.
8. A voltage detection method, comprising:
receiving the voltage output by the voltage limiting module;
judging whether the voltage is greater than a preset working voltage or not;
if so, a current is generated and transmitted to the comparator module.
9. A voltage detection system, comprising: a voltage detection circuit as claimed in any one of claims 1 to 7, and a voltage protection circuit;
the output end of a comparator module of the voltage detection circuit is connected with the input end of the voltage protection circuit;
the voltage detection circuit is used for detecting the input voltage and inputting the detection result to the voltage protection circuit;
and the voltage protection circuit is used for receiving the detection result and adjusting the working voltage of the voltage detection system according to the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910279489.3A CN109991462A (en) | 2019-04-08 | 2019-04-08 | Voltage detecting circuit, method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910279489.3A CN109991462A (en) | 2019-04-08 | 2019-04-08 | Voltage detecting circuit, method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109991462A true CN109991462A (en) | 2019-07-09 |
Family
ID=67132566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910279489.3A Pending CN109991462A (en) | 2019-04-08 | 2019-04-08 | Voltage detecting circuit, method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109991462A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
| CN112415257A (en) * | 2020-10-26 | 2021-02-26 | 海信视像科技股份有限公司 | Voltage detection circuit and electronic equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808699A (en) * | 1995-10-02 | 1998-09-15 | Matsushita Electric Industrial Co., Ltd. | Visual image signal processing apparatus using arithmetic operation on brightness reference signal overlaid in fly-back period of input visual image signal |
| KR101063645B1 (en) * | 2011-07-29 | 2011-09-07 | 김근식 | Volt clamping apparatus for constant current circuit |
| CN103091526A (en) * | 2011-11-04 | 2013-05-08 | 上海华虹Nec电子有限公司 | Voltage detection circuit |
| CN203572867U (en) * | 2013-11-25 | 2014-04-30 | 深圳市金威源科技股份有限公司 | Input power supply power down detection circuit |
| CN104039053A (en) * | 2014-06-20 | 2014-09-10 | 美芯晟科技（北京）有限公司 | Control method and control circuit for low-voltage power supply and low-voltage power supply circuit utilizing control circuit |
| CN104521326A (en) * | 2012-05-28 | 2015-04-15 | 松下知识产权经营株式会社 | Light emitting diode driving apparatus and semiconductor device |
| CN206223841U (en) * | 2016-08-16 | 2017-06-06 | 大唐恩智浦半导体有限公司 | A kind of low-voltage testing circuit and half-bridge driven chip |
| US9720030B2 (en) * | 2015-06-08 | 2017-08-01 | Nxp Usa, Inc. | Systems and methods for testing a clamp function for insulated gate bipolar transistors |
| CN108828296A (en) * | 2018-08-17 | 2018-11-16 | 深圳南云微电子有限公司 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
-
2019
- 2019-04-08 CN CN201910279489.3A patent/CN109991462A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808699A (en) * | 1995-10-02 | 1998-09-15 | Matsushita Electric Industrial Co., Ltd. | Visual image signal processing apparatus using arithmetic operation on brightness reference signal overlaid in fly-back period of input visual image signal |
| KR101063645B1 (en) * | 2011-07-29 | 2011-09-07 | 김근식 | Volt clamping apparatus for constant current circuit |
| CN103091526A (en) * | 2011-11-04 | 2013-05-08 | 上海华虹Nec电子有限公司 | Voltage detection circuit |
| CN104521326A (en) * | 2012-05-28 | 2015-04-15 | 松下知识产权经营株式会社 | Light emitting diode driving apparatus and semiconductor device |
| CN203572867U (en) * | 2013-11-25 | 2014-04-30 | 深圳市金威源科技股份有限公司 | Input power supply power down detection circuit |
| CN104039053A (en) * | 2014-06-20 | 2014-09-10 | 美芯晟科技（北京）有限公司 | Control method and control circuit for low-voltage power supply and low-voltage power supply circuit utilizing control circuit |
| US9720030B2 (en) * | 2015-06-08 | 2017-08-01 | Nxp Usa, Inc. | Systems and methods for testing a clamp function for insulated gate bipolar transistors |
| CN206223841U (en) * | 2016-08-16 | 2017-06-06 | 大唐恩智浦半导体有限公司 | A kind of low-voltage testing circuit and half-bridge driven chip |
| CN108828296A (en) * | 2018-08-17 | 2018-11-16 | 深圳南云微电子有限公司 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 蒋德智: "一种基于TL2844B的变频器用反激式开关电源设计", 《电子世界》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
| CN112415257A (en) * | 2020-10-26 | 2021-02-26 | 海信视像科技股份有限公司 | Voltage detection circuit and electronic equipment |
| CN112415257B (en) * | 2020-10-26 | 2022-04-22 | 海信视像科技股份有限公司 | Voltage detection circuit and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210273462A1 (en) | Open cell detection method and open cell recovery detection method in a battery management system | |
| US10523022B2 (en) | Power management circuit for dynamically cut-off voltage of battery | |
| US20160344210A1 (en) | Power adapter, terminal, and method for processing impedance anomalies in charging circuit | |
| EP3171480B1 (en) | Method for identifying types of cables, power adaptor and cable | |
| TW201029288A (en) | Protection circuit with timer, battery systems and protection methods | |
| CN109991462A (en) | Voltage detecting circuit, method and system | |
| JP2011259693A (en) | Battery charging protective circuit | |
| CN109828173B (en) | Load detection system and load detection method thereof | |
| US20230009240A1 (en) | Open cell detection systems and methods | |
| EP2400368B1 (en) | Power cut-off based on current | |
| US11809251B2 (en) | Power control device, display device, and power control method | |
| TW201737585A (en) | A charger circuit and a power system | |
| KR20190005643A (en) | Electronic device supporting usb power delivery standard and a method of charging the electronic device | |
| CN110501554B (en) | Detection method and device for installation of memory chip | |
| CN112214430B (en) | USB Type-C connector detection method and dual-purpose port device | |
| US7558039B2 (en) | Method, apparatus, and computer program product for detecting excess current flow in a pluggable component | |
| TWI641221B (en) | Interface circuit of an electronic device | |
| CN207074996U (en) | Interface circuit and electronic equipment | |
| CN106877452B (en) | Charging method and charging device | |
| US11846682B2 (en) | Method and device for avoiding abnormal signal oscillation in UVLO test | |
| CN109274611B (en) | Method for switching sharing network protocol by baseboard management controller | |
| US12061237B2 (en) | Detecting whether a battery management system is abnormal | |
| JP7357127B2 (en) | Smart battery device and its quick charging method | |
| CN116243215A (en) | Electrical appliance plug-in spark-proof detection method, device, system and storage medium | |
| US11831145B2 (en) | Current sensing protection device for sensing whether current sensing element occurs short phenomenon |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Room 01, 10 / F, block a, Tiangong building, Keda, 30 Xueyuan Road, Haidian District, Beijing 100089 Applicant after: Meixinsheng Technology (Beijing) Co.,Ltd. Address before: 100000 floor 10, block a, Tiangong building, Keda, 30 Xueyuan Road, Haidian District, Beijing Applicant before: MAXIC TECHNOLOGY (BEIJING) Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190709 |
|
| RJ01 | Rejection of invention patent application after publication |