CN220509024U - Detection circuit, circuit board and electronic equipment - Google Patents
Detection circuit, circuit board and electronic equipment Download PDFInfo
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- CN220509024U CN220509024U CN202321886603.7U CN202321886603U CN220509024U CN 220509024 U CN220509024 U CN 220509024U CN 202321886603 U CN202321886603 U CN 202321886603U CN 220509024 U CN220509024 U CN 220509024U
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- 238000001514 detection method Methods 0.000 title claims abstract description 79
- 238000005070 sampling Methods 0.000 claims abstract description 126
- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
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Abstract
The utility model provides a detection circuit, a circuit board and electronic equipment, which are applied to the field of integrated circuits, wherein the detection circuit comprises a signal input end for receiving a high-voltage sampling signal, the high-voltage sampling signal is determined through a sampling resistor in a preset driving module, an operational amplifier circuit for amplifying the high-voltage sampling signal to output a target sampling signal, and an optical coupler for carrying out photoelectric isolation on the target sampling signal to output a low-voltage detection signal, the signal input end is electrically connected with the preset driving module, and the signal input end is sequentially connected with the operational amplifier circuit, the optical coupler and the signal output end in series. The utility model can separate the high-voltage circuit signal from the low-voltage circuit signal while accurately measuring the current value, thereby realizing an accurate and safe detection circuit.
Description
Technical Field
The present utility model relates to the field of integrated circuits, and in particular, to a detection circuit, a circuit board, and an electronic device.
Background
In the age of rapid development of electronic information technology, more and more products begin to pay attention to the power consumption problem, and then a detection circuit for detecting the power consumption of the products appears.
At present, the current value of the detection circuit is directly adopted by the detection circuit of the vibrator used in the market generally by utilizing a sampling resistor, however, as the working voltage of the vibrator product is 220V, a high-voltage signal is dangerous to a low-voltage device in the next stage, the current sampling is only performed by adopting the sampling resistor, so that the high-low voltage isolation cannot be performed, the safety risk is high, the detection is inconvenient, and the current value of the circuit cannot be accurately and conveniently measured.
Disclosure of Invention
In view of the above problems, embodiments of the present utility model provide a detection circuit, a circuit board, and an electronic device, so as to solve the problem that in the prior art, high-low voltage isolation cannot be performed in current sampling, and a circuit current value cannot be accurately and conveniently measured.
The embodiment of the utility model discloses a detection circuit, which comprises a signal input end for receiving a high-voltage sampling signal, wherein the high-voltage sampling signal is determined through a sampling resistor in a preset driving module;
the operational amplifier circuit is used for amplifying the high-voltage sampling signal to output a target sampling signal; the optical coupler is used for carrying out photoelectric isolation on the target sampling signal and outputting a low-voltage detection signal;
the signal input end is electrically connected with the preset driving module, and the signal input end, the operational amplifier circuit, the optical coupler and the signal output end are sequentially connected in series.
Optionally, the preset driving module specifically includes a sampling resistor for converting a current signal into a voltage signal, the sampling resistor is connected in series in the preset driving module, and the high-voltage sampling signal is determined according to a voltage drop of the current signal passing through the sampling resistor.
Optionally, the detection circuit further comprises a filtering circuit for filtering the high voltage sampling signal.
Optionally, the filter circuit includes a first filter circuit and a second filter circuit;
the first filter circuit is electrically connected between the signal input end and the operational amplifier circuit, and the second filter circuit is electrically connected between the operational amplifier circuit and the optocoupler.
Optionally, the operational amplifier circuit specifically includes an operational amplifier, a first resistor and a second resistor;
the positive input end of the operational amplifier is an input end of the operational amplifier circuit and is electrically connected with the output end of the first filter circuit;
the negative input end of the operational amplifier is electrically connected with the common end of the first resistor and the second resistor, and the other end of the first resistor is grounded;
the output end of the operational amplifier is the output end of the operational amplifier circuit, and the output end of the operational amplifier is electrically connected with the input end of the second filter circuit.
Optionally, an input end of the optical coupler is electrically connected with an output end of the second filter circuit;
the optocoupler comprises a light emitting diode and a photosensitive device which are used for forming negative feedback to isolate the change value of the high-voltage sampling signal current into a low-voltage detection signal.
Optionally, the light emitting diode of the optocoupler includes a first primary side for receiving the filtered high voltage sampling signal, and a second primary side, and the photosensitive device includes a first secondary side, and a second secondary side for outputting the low voltage detection signal;
the second primary end and the first secondary end are grounded, and the second secondary end is electrically connected with a common end of the third resistor and the fourth resistor.
Optionally, the optical coupler is one of a photodiode optical coupler and a linear coupler.
The utility model also provides a circuit board comprising the detection circuit.
The utility model also provides electronic equipment, which comprises the circuit board.
The embodiment of the utility model has the following advantages:
the detection circuit provided by the utility model comprises a signal input end for receiving a high-voltage sampling signal, wherein the high-voltage sampling signal is determined through a sampling resistor in a preset driving module, an operational amplifier circuit for amplifying the high-voltage sampling signal to output a target sampling signal, and an optical coupler for carrying out photoelectric isolation on the target sampling signal to output a low-voltage detection signal, the signal input end is electrically connected with the preset driving module, and the signal input end, the operational amplifier circuit, the optical coupler and the signal output end are sequentially connected in series. The utility model collects high-voltage sampling signals by using the sampling resistor and obtains low-voltage detection signals of high-voltage and low-voltage photoelectric isolation by using the detection circuit, and because the voltage difference output by the sampling resistor value can not reach the working area of the optical coupler, the high-voltage sampling signals obtained by the sampling resistor are amplified in amplitude by the operational amplifier circuit and then input into the optical coupler, and the high-voltage and low-voltage detection signals are detected while the high-voltage and low-voltage are isolated by using the linear optocoupler characteristic of the optical coupler, thereby solving the problems that the voltage is too high and unsafe and the amplitude is too small to accurately detect when the current of the power output end of the vibration feeder is detected, and ensuring that the circuit can accurately detect the current value and simultaneously isolate the high-voltage circuit signals and the low-voltage circuit signals, thereby realizing accurate and safe circuit detection.
Drawings
FIG. 1 is a block diagram of a detection circuit of the present utility model;
FIG. 2 is a schematic circuit diagram of a detection circuit of the present utility model;
fig. 3 is a schematic circuit diagram of a preset driving module in a detection circuit according to the present utility model.
Reference numerals:
the circuit comprises a 10-detection circuit, a 20-preset driving module, a 101-signal input end, a 102-operational amplifier circuit, a 103-optical coupler, a 104-signal output end and a 201-sampling resistor.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, there is shown a block diagram of a detection circuit 10 of the present utility model, the detection circuit 10 comprising a signal input 101 for receiving a high voltage sampling signal, wherein the high voltage sampling signal is determined by a sampling resistor 201 in a preset driving module 20; an operational amplifier circuit 102 for amplifying the high-voltage sampling signal to output a target sampling signal; an optical coupler 103 for photoelectrically isolating a target sampling signal to output a low-voltage detection signal; the signal input end 101 is electrically connected with the preset driving module 20, and the signal input end 101 is sequentially connected with the operational amplifier circuit 102, the optical coupler 103 and the signal output end 104 in series.
In the embodiment of the utility model, in order to solve the problems of high working voltage, high sampling risk of a high-voltage end current value and low sampling precision of the vibration feeding controller, a sampling resistor 201 is utilized to collect a high-voltage sampling signal of a preset driving module 20, and then a low-voltage detection signal after photoelectric isolation is obtained through an operational amplifier circuit 102 and an optical coupler 103, so that the low-voltage detection signal is transmitted to a main control unit of a singlechip for current detection.
It should be noted that, the preset driving module 20 is a driving part of the vibration feeder, the sampling resistor 201 is connected in series between ho_h and lo_l in the driving, the sampling resistor 201 is connected in series to the circuit, and the voltages at two ends of the sampling resistor 201 are measured to obtain values, so as to determine the high voltage sampling signal. The specification and resistance value of the sampling resistor 201 used in the present embodiment are 0.1 ohm 10w, which is not particularly limited in this embodiment, and the resistance value of the sampling resistor 201 is selectively set according to the power and current of the vibrator.
In this embodiment, due to the power characteristic problem of the vibration feeder, the resistance of the sampling resistor 201 cannot be too large, which affects the efficiency and the safety, but the voltage difference output by the value of the sampling resistor 201 cannot reach the working area of the optocoupler 103, so that the signal input end 101, the operational amplifier 102, the optocoupler 103 and the signal output end 104 in the detection circuit 10 of this embodiment are sequentially connected in series, the signal input end 101 is used for receiving the high-voltage sampling signal output by the preset driving module 20, and the high-voltage sampling signal is input to the operational amplifier 102, amplified and then transmitted to the optocoupler 103, and the sampling value is amplified to the linear optocoupler working area, thereby achieving the purposes of not only collecting available data, but also achieving photoelectric isolation.
The operational amplifier 102 is used for amplifying the high-voltage sampling signal, outputting the target sampling signal, amplifying the low-amplitude signal by a certain multiple by using an operational amplifier, and the amplitude variation is obvious. The optocoupler 103 is used for photoelectrically isolating a target sampling signal and outputting a low-voltage detection signal, the optocoupler 103 is an optocoupler device for analog signal isolation, the optocoupler 103 truly isolates current, and the optocoupler 103 in the embodiment can protect a tested object and a test circuit and reduce the influence of environmental interference on the test circuit.
The detection circuit 10 provided by the embodiment of the utility model comprises a signal input end 101, an operational amplifier circuit 102, an optical coupler 103 and a signal output end 104, wherein the signal input end 101 is electrically connected with a preset driving module 20, the signal input end 101 is sequentially connected with the operational amplifier circuit 102, the optical coupler 103 and the signal output end 104 in series, the signal input end 101 is used for receiving a high-voltage sampling signal output by the preset driving module 20 and inputting the high-voltage sampling signal to the operational amplifier circuit 102, the high-voltage sampling signal is determined by a sampling resistor 201 in the preset driving module 20, the operational amplifier circuit 102 is used for amplifying the high-voltage sampling signal and outputting a target sampling signal, and the optical coupler 103 is used for photoelectrically isolating the target sampling signal and outputting a low-voltage detection signal. The utility model utilizes the sampling resistor 201 to collect high-voltage sampling signals, and obtains low-voltage detection signals of high-voltage and low-voltage photoelectric isolation through the detection circuit 10, as the voltage difference output by the sampling resistor 201 value cannot reach the working area of the optocoupler 103, the high-voltage sampling signals obtained by the sampling resistor 201 are amplified in amplitude by the operational amplifier circuit 102 and then input into the optocoupler 103, and the low-voltage detection signals are measured while the high-voltage and low-voltage are isolated by utilizing the linear optocoupler characteristic of the optocoupler 103, thereby solving the problems that the voltage is too high and unsafe and the amplitude is too small to accurately detect when the current of the power output end of the vibration feeder is detected, and enabling the circuit to isolate the high-voltage circuit signals and the low-voltage circuit signals while accurately measuring the current value, thereby realizing the accurate and safe detection circuit 10.
Referring to fig. 3, a circuit schematic diagram of a preset driving module 20 electrically connected to the detection circuit 10 is shown, the preset driving module 20 is a driving circuit of a vibration feeder, in a ho_h area, a diode D1 is connected in parallel with a resistor R5 and then a common terminal is electrically connected to a triode Q2, the triode Q2 is connected to a high voltage terminal, the high voltage power supply operating voltage is 330V, the other end of the triode Q2 is electrically connected to the diode D5 and then grounded, and the high voltage power supply terminal is connected in series with a capacitor C1 and a resistor R6 and then grounded, wherein three pin terminals of an integrated chip P3 are respectively electrically connected to ho_ H, lo _l and grounded. Another diode D3 is connected in series in the lo_l region, the common terminal of the diode D3 is electrically connected with a circuit portion of the triode Q3 after being connected in parallel with the resistor R9, and the circuit portion is electrically connected with the high voltage terminal, wherein the sampling resistor R15 is connected in series in the preset driving module 20, and is used for determining a high voltage sampling signal by sampling voltages at two ends of the resistor 201 between ho_h and lo_l.
Specifically, the preset driving module specifically comprises a sampling resistor for converting a current signal into a voltage signal, the sampling resistor is connected in series in the preset driving module, and the high-voltage sampling signal is determined according to the voltage drop of the current signal passing through the sampling resistor.
In the embodiment of the present utility model, the sampling resistor 201 is connected in series in the preset driving module 20, and measures the current through the voltage drop at two ends of the sensing resistor, that is, the high voltage sampling signal is determined according to the voltage drop of the current signal passing through the sampling resistor 201, where the sampling resistor 201 can sample the current and sample the voltage, if the current is sampled, a resistor with a smaller resistance value is connected in series, and if the voltage is sampled, a resistor with a larger resistance value is connected in parallel, and in this embodiment, the sampling resistor 201 is connected in series in the preset driving module 20, and is used for converting the current signal into the voltage signal.
In addition, the current is measured by the voltage drop across the sense resistor, and a resistance value of 10mV to 100mV is generally used for the voltage drop when the current passes through, and a small resistance value of several Ω or less is generally used for the current detection low resistor, and in this embodiment, the sampling resistor 201 is placed between the power supply and the load in the circuit for high-side sensing when the current is measured.
It should be noted that, when detecting the voltage drop when the current passes through the sampling resistor 201, the pattern for detecting the voltage needs to be led out from both ends of the sampling resistor 201, and may be led out from the center of the inner side of the electrode pad of the sampling resistor 201, because the copper foil pattern of the circuit substrate also has a tiny resistance value, and the influence of the voltage drop caused by the resistance value of the copper foil pattern needs to be avoided, the specific collecting process of the high-voltage sampling signal is not limited in this embodiment, and will not be described in detail here.
In the embodiment of the utility model, the sampling resistor 201 is used for collecting the high-voltage sampling signal, so that the voltage at two ends of the sampling resistor 201 can be measured to obtain the value, the voltage at two ends of the serial sampling resistor 201 is relatively smaller, the power loss is low, and the accuracy of the sampling signal can be improved.
Referring to fig. 2, a schematic circuit diagram of the detection circuit 10 is shown, wherein the signal input terminal is electrically connected to an RC filter circuit, wherein the RC filter circuit comprises a resistor R44 and two capacitors C43 and C44, the two capacitors C43 and C44 are connected in parallel and then connected in series with the capacitor R44 to form a first filter circuit electrically connected to the positive input terminal of the operational amplifier, and the same is followed by the filter circuit, the negative input terminal of the operational amplifier is connected in series to two parallel resistors R50 and R54, and the first resistor R54 is grounded, the other end of the operational amplifier is electrically connected to a 12V power supply, wherein the capacitors C29 and C30 are connected in series between the power supply and the operational amplifier, and the capacitors C29 and C30 are respectively grounded. The second filter circuit is electrically connected with the output end of the operational amplifier, the second filter circuit comprises a resistor R47, the resistor R47 is connected with the common end of a capacitor C40 and a capacitor C41 in series, the capacitor C40 and the capacitor C41 are respectively grounded, a high-voltage sampling signal filtered by the second filter circuit passes through an optical coupler 103, the optical coupler 103 comprises a light emitting diode and a photosensitive diode, one primary end and one secondary end are grounded, the other secondary end is electrically connected with a low-voltage power supply, after the low-voltage power supply is connected with two capacitors C31 and C32 in parallel, a resistor R43 is connected with the secondary end of the optical coupler 103 in series, and after the optical coupler 103 is connected with the resistor R48 in series, a low-voltage detection signal is output to a main control MCU of the singlechip.
Specifically, the detection circuit further includes a filter circuit for filtering the high-voltage sampling signal.
In the embodiment of the utility model, in order to reduce interference in signals and remove interference of other interference signals such as noise, a filter circuit is added, wherein the filter circuit adopted in the embodiment is an RC filter circuit, and the RC filter circuit can be connected in series in the detection circuit 10 and is used for filtering high-voltage sampling signals in each stage, thereby improving the accuracy of the sampling signals.
Specifically, the filter circuit comprises a first filter circuit and a second filter circuit, wherein the first filter circuit is electrically connected between the signal input end and the operational amplifier circuit, and the second filter circuit is electrically connected between the operational amplifier circuit and the optical coupler.
In the embodiment of the utility model, the filter circuit comprises a first filter circuit and a second filter circuit, wherein the first filter circuit is electrically connected between the signal input end 101 and the operational amplifier circuit 102, the second filter circuit is electrically connected between the operational amplifier circuit 102 and the optical coupler 103, and the RC filter circuit is added before the high-voltage sampling signal is amplified, and the RC filter circuit is also added after the operational amplifier is output, so that the fault tolerance of the circuit is increased.
The filter circuit is composed of a resistor and a capacitor, one end of the resistor in the first filter circuit is electrically connected with the signal input end 101, the other end of the resistor is electrically connected with a common end of two parallel capacitors, the input high-voltage sampling signal is subjected to filtering treatment, one end of the resistor in the second filter circuit is electrically connected with an output end of the operational amplifier circuit 102, the other end of the resistor is electrically connected with a common end of two parallel capacitors, wherein the specifications of the resistor and the capacitor adopted by the first filter circuit and the second filter circuit are consistent, and the two capacitors can adopt 10nf 50V and 10uf 16V, and are not particularly limited.
Specifically, the operational amplifier circuit comprises an operational amplifier, a first resistor and a second resistor, wherein the positive input end of the operational amplifier is the input end of the operational amplifier circuit, the positive input end of the operational amplifier is electrically connected with the output end of the first filter circuit, the negative input end of the operational amplifier is electrically connected with the common end of the first resistor and the second resistor, the other end of the first resistor is grounded, the output end of the operational amplifier is the output end of the operational amplifier circuit, and the output end of the operational amplifier is electrically connected with the input end of the second filter circuit.
In the embodiment of the present utility model, the positive input end of the operational amplifier 102 is electrically connected to the output end of the first filter circuit, the filtered high-voltage sampling signal is input, the negative input end of the operational amplifier is electrically connected to the common end of the first resistor and the second resistor, the other end of the first resistor is grounded, the resistance value of the first resistor of the operational amplifier 102 may be 20k 1%, the resistance value of the second resistor may be 100k 1%, and the voltage value corresponding to the high-voltage sampling signal input by the positive input end of the operational amplifier 102. It will be appreciated that in this embodiment amplification of the high voltage sampled signal is achieved for output to the input of the optocoupler 103.
It should be noted that, the operational amplifier 102 is an amplifying circuit capable of performing mathematical operation on signals, and is made by an integrated circuit process, and has the advantages of being exquisite, low-cost, flexible to use, and the like besides maintaining the original characteristics of very high gain and input impedance, so that the operational amplifier is widely applied in the aspects of direct current signal amplification, waveform generation and transformation, signal processing, and the like. In the above embodiment, the voltage difference output by the value of the sampling resistor 201 cannot reach the working area of the linear optical coupler, and the amplitude amplification processing can be performed on the high-voltage sampling signal by the operational amplifier circuit 102, so that the amplified high-voltage sampling signal can meet a larger setting range, thereby improving the detection range of the detection circuit 10.
Specifically, the input end of the optical coupler is electrically connected with the output end of the second filter circuit, and the optical coupler comprises a light emitting diode and a photosensitive device which are used for forming negative feedback to isolate the change value of the high-voltage sampling signal current into a low-voltage detection signal.
In the embodiment of the present utility model, the input end of the optocoupler 103 is electrically connected to the output end of the second filter circuit, so as to isolate the variation value of the high-voltage sampling signal current into a low-voltage detection signal, and output the low-voltage detection signal to the main control MCU of the singlechip for current detection. The optocoupler 103 includes a light emitting diode and a photosensitive device, where the light emitting diode and the photosensitive diode form negative feedback, and the optocoupler performs photoelectric isolation to obtain a voltage signal and perform high-low photoelectric isolation to isolate a change value of a high-voltage sampling signal current into a low-voltage detection signal.
The optical coupler 103 is a group of devices for transmitting an electric signal using light as a medium, and functions to maintain a good isolation between input and output of the electric signal at ordinary times, and to enable the electric signal to pass through the isolation layer when necessary.
Specifically, the light emitting diode of the optocoupler includes a first primary terminal for receiving the filtered high-voltage sampling signal and a second primary terminal, the photosensor includes a first secondary terminal, and a second secondary terminal for outputting a low-voltage detection signal, the second primary terminal and the first secondary terminal are grounded, and the second secondary terminal is electrically connected to a common terminal of the third resistor and the fourth resistor.
In the embodiment of the present utility model, the light emitting diode of the optocoupler 103 includes a first primary end and a second primary end, receives the filtered high-voltage sampling signal, forms negative feedback with the photodiode, outputs a low-voltage detection signal, and achieves the purpose of high-voltage and low-voltage photoelectric isolation.
In particular, in this embodiment, the primary side of the optocoupler 103 is a light emitting source, the light receiver of the optocoupler 103IC1 is a secondary side, when the first primary side of the optocoupler 103 outputs an electrical signal, the light emitting source emits light, and the light irradiates the light receiver packaged together, and the light receiver of the optocoupler 103 generates a photocurrent after being irradiated with light and outputs the photocurrent through the second secondary side of the optocoupler 103.
Specifically, the optical coupler 103 is one of a photodiode type optical coupler and a linear coupler.
In the embodiment of the present utility model, the optocoupler 103 is one of a photodiode-type optocoupler and a linear coupler, the optotriode-type optocoupler IC1 (the light emitting source is a light emitting diode, the light receiving device is a phototriode), the model of the optocoupler 103 is generally PC817B, the triode is an NPN triode, the linear optocoupler is an optocoupler device for analog signal isolation, and like a common optocoupler, the linear optocoupler truly isolates current, and the linear optocoupler can protect a tested object and a test circuit and reduce the influence of environmental interference on the test circuit.
In the embodiment of the utility model, the sampling resistor 201 is used for collecting high-voltage sampling signals, the detection circuit 10 is used for obtaining the low-voltage detection signals of high-voltage and low-voltage photoelectric isolation, and as the voltage difference output by the sampling resistor 201 cannot reach the working area of the optocoupler 103, the high-voltage sampling signals obtained by the sampling resistor 201 are amplified in amplitude by the operational amplifier circuit 102 and then input into the optocoupler 103, and the high-voltage and low-voltage detection signals are measured while the high-voltage and low-voltage are isolated by the linear optocoupler characteristics of the optocoupler 103, so that the problems that the voltage is too high and unsafe and the amplitude is too small to accurately detect when the current of the power output end of the vibrating feeder is detected are solved, and the circuit can accurately measure the current value and isolate the high-voltage signals and the low-voltage circuit signals, thereby realizing an accurate and safe detection circuit.
The utility model also provides a circuit board comprising the detection circuit of any one of the above.
Specifically, the circuit board applying the detection circuit can be an industrial control circuit board with a single-path or multi-path power input interface, and can directly send out indication information under the condition that power supply is abnormal, so that personnel can intuitively monitor the working state of the circuit board, and the protection of the circuit board is enhanced to a certain extent.
The embodiment of the utility model also provides electronic equipment, which comprises the detection circuit or the circuit board.
Specifically, the electronic device applying the detection circuit or the electronic device applying the circuit board can be an industrial control computer or a server with a single-path or multi-path power input interface, and the electronic device can prompt and stop starting under the condition of abnormal power supply, so that the use safety of the electronic device is ensured.
The detection circuit, the circuit board and the electronic device provided by the utility model are described in detail, and specific examples are applied to illustrate the principle and the implementation of the utility model, and the description of the above examples is only used for helping to understand the method and the core idea of the utility model; the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and it is intended to cover the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the utility model.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A detection circuit, the detection circuit comprising:
a signal input for receiving a high voltage sampling signal; the high-voltage sampling signal is determined through a sampling resistor in an external preset driving module;
the operational amplifier circuit is used for amplifying the high-voltage sampling signal to output a target sampling signal;
the optical coupler is used for carrying out photoelectric isolation on the target sampling signal and outputting a low-voltage detection signal;
the signal input end is electrically connected with the preset driving module, and the signal input end, the operational amplifier circuit, the optical coupler and the signal output end are sequentially connected in series.
2. The detection circuit according to claim 1, wherein the preset driving module specifically comprises a sampling resistor for converting a current signal into a voltage signal; the sampling resistor is connected in series in the preset driving module, and the high-voltage sampling signal is determined according to the voltage drop of the current signal passing through the sampling resistor.
3. The detection circuit of claim 1, further comprising a filtering circuit for filtering the high voltage sampled signal.
4. A detection circuit according to claim 3, wherein the filter circuit comprises a first filter circuit and a second filter circuit;
the first filter circuit is electrically connected between the signal input end and the operational amplifier circuit, and the second filter circuit is electrically connected between the operational amplifier circuit and the optocoupler.
5. The detection circuit of claim 4, wherein the operational amplifier comprises an operational amplifier, a first resistor, and a second resistor;
the positive input end of the operational amplifier is an input end of the operational amplifier circuit and is electrically connected with the output end of the first filter circuit;
the negative input end of the operational amplifier is electrically connected with the common end of the first resistor and the second resistor, and the other end of the first resistor is grounded;
the output end of the operational amplifier is the output end of the operational amplifier circuit, and the output end of the operational amplifier is electrically connected with the input end of the second filter circuit.
6. The detection circuit of claim 1, wherein an input of the optocoupler is electrically connected to an output of the second filter circuit;
the optocoupler comprises a light emitting diode and a photosensitive device which are used for forming negative feedback to isolate the change value of the high-voltage sampling signal current into a low-voltage detection signal.
7. The detection circuit of claim 6, wherein the light emitting diode of the optocoupler includes a first primary side for receiving the filtered high voltage sampling signal and a second primary side, the photosensitive device includes a first secondary side and a second secondary side for outputting the low voltage detection signal;
the second primary end and the first secondary end are grounded, and the second secondary end is electrically connected with a common end of the third resistor and the fourth resistor.
8. The detection circuit of claim 1, wherein the optocoupler is one of a photodiode optocoupler and a linear coupler.
9. A circuit board comprising the detection circuit of any one of claims 1-8.
10. An electronic device comprising the circuit board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321886603.7U CN220509024U (en) | 2023-07-17 | 2023-07-17 | Detection circuit, circuit board and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321886603.7U CN220509024U (en) | 2023-07-17 | 2023-07-17 | Detection circuit, circuit board and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220509024U true CN220509024U (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321886603.7U Active CN220509024U (en) | 2023-07-17 | 2023-07-17 | Detection circuit, circuit board and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN220509024U (en) |
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2023
- 2023-07-17 CN CN202321886603.7U patent/CN220509024U/en active Active
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