An electrical signal monitoring circuit

Abstract

The application provides a kind of electric signal monitoring circuit, including first resistance to sixth resistance, first dual-channel comparator and second dual-channel comparator;First resistance one end is connected with electric signal input terminal, the other end is connected with second resistance after series connection and ground;The one end of third resistance is connected with power supply voltage, the other end is connected with fourth resistance and fifth resistance after series connection and ground;The positive input terminal of first dual-channel comparator is connected with the connection end of third resistance and fourth resistance, the negative input terminal is connected with the connection end of first resistance and second resistance;The positive input terminal of second dual-channel comparator is connected with the connection end of first resistance and second resistance, the negative input terminal is connected with the connection end of fourth resistance and fifth resistance;The one end of sixth resistance is connected with power supply voltage, the other end is connected with the output terminal of first dual-channel comparator and the output terminal of first dual-channel comparator.The electric signal monitoring circuit of the application can realize wide range of electric signal monitoring, meet the needs of different application scenarios, and has strong practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuits, in particular to a kind of electric signal monitoring circuit. BACKGROUND

[0002] Electric signal monitoring circuit is generally used to monitor whether electric signal is in normal range.In prior art, in current or voltage sampling circuit, current sampling needs to pass through a precision resistor first, and current signal is converted into voltage signal.After sampling or conversion, voltage signal passes through a voltage monitoring circuit, and corresponding parameter conversion is carried out to monitor whether the collected signal is in specified range.

[0003] However, the parameter monitoring range of the existing electric signal monitoring circuit is small, and cannot meet the needs of different application scenarios. SUMMARY

[0004] In view of the above-mentioned shortcomings of prior art, the purpose of the present application is to provide an electric signal monitoring circuit, which can realize wide-range electric signal monitoring, meet the needs of different application scenarios, and has strong practicality.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides an electric signal monitoring circuit, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first dual-channel comparator and a second dual-channel comparator; one end of the first resistor is connected with an electric signal input end, and the other end is connected with the second resistor in series and then grounded; one end of the third resistor is connected with a power supply voltage, and the other end is connected with the fourth resistor and the fifth resistor in series and then grounded; the positive input end of the first dual-channel comparator is connected with the connection end of the third resistor and the fourth resistor, and the negative input end is connected with the connection end of the first resistor and the second resistor; the positive input end of the second dual-channel comparator is connected with the connection end of the first resistor and the second resistor, and the negative input end is connected with the connection end of the fourth resistor and the fifth resistor; one end of the sixth resistor is connected with the power supply voltage, and the other end is connected with the output end of the first dual-channel comparator and the output end of the second dual-channel comparator, and serves as an electric signal monitoring output end.

[0006] In an embodiment of the present application, a first capacitor is further included, which is connected in parallel with the fourth resistor.

[0007] In an embodiment of the present application, a second capacitor is further included, which is connected in parallel with the fifth resistor.

[0008] In an embodiment of the present application, a third capacitor is further included, which is connected in parallel with the second resistor.

[0009] In an embodiment of the present application, a fourth capacitor is further included, one end of which is connected with the power supply voltage, and the other end is grounded.

[0010] In an embodiment of the present application, the switch is connected to the input end of the electrical signal in series with the precision resistor.

[0011] In an embodiment of the present application, the switch is a key switch.

[0012] In an embodiment of the present application, when the input end of the electrical signal inputs a voltage signal, the switch is open; when the input end of the electrical signal inputs a current signal, the switch is closed.

[0013] In an embodiment of the present application, the voltage at the connection end of the first resistor and the second resistor is set as VIN, the voltage at the connection end of the third resistor and the fourth resistor is set as VREFH, and the voltage at the connection end of the fourth resistor and the fifth resistor is set as VREFL.

[0014] When VIN>VREFH>VREFL, the output end of the electrical signal monitoring outputs a low level.

[0015] When VREFL<VIN<VREFH, the output end of the electrical signal monitoring outputs a high level.

[0016] When VIN<VREFL<VREFH, the output end of the electrical signal monitoring outputs a low level.

[0017] In an embodiment of the present application, a pre-warning module is further included, connected to the output end of the electrical signal monitoring, for issuing a pre-warning when the output end of the electrical signal monitoring outputs a low level.

[0018] As described above, the electrical signal monitoring circuit of the present application has the following beneficial effects:

[0019] (1) It can realize wide-range electrical signal monitoring, and effectively expand the monitoring range through voltage division, thereby meeting the needs of different application scenarios.

[0020] (2) It can monitor voltage or current signals and timely issue a pre-warning when the monitored signal exceeds the preset range, so that the system can timely learn the abnormal state of the monitored signal, effectively improving the safety and reliability of the monitored signal.

[0021] (3) The circuit structure is simple, easy to implement, low in cost, and strong in operability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 shows the structure of an embodiment of the electrical signal monitoring circuit of the present application. DETAILED DESCRIPTION

[0023] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0025] The electrical signal monitoring circuit of the present invention can realize wide-range monitoring of voltage and current signals, and can effectively expand the monitoring range through voltage division, thereby meeting the needs of different application scenarios and having strong practicality.

[0026] like Figure 1 As shown, in one embodiment, the electrical signal monitoring circuit of the present invention includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first dual-channel comparator U2A, and a second dual-channel comparator U2B.

[0027] One end of the first resistor R1 is connected to the electrical signal input terminal Signal_In, and the other end is connected in series with the second resistor R2 and grounded to GND.

[0028] One end of the third resistor R3 is connected to the power supply voltage VCC, and the other end is connected in series with the fourth resistor R4 and the fifth resistor R5 and then grounded to GND.

[0029] The positive input terminal of the first dual-channel comparator U2A is connected to the connection terminal VREFH of the third resistor R3 and the fourth resistor R4, and the negative input terminal is connected to the connection terminal VIN of the first resistor R1 and the second resistor R2.

[0030] The positive input terminal of the second dual comparator U2B is connected to the connection terminal VIN of the first resistor R1 and the second resistor R2, and the negative input terminal is connected to the connection terminal VREFL of the fourth resistor R4 and the fifth resistor R5.

[0031] One end of the sixth resistor R6 is connected with the power supply voltage VCC, and the other end is connected with the output end of the first dual-channel comparator U2A and the output end of the second dual-channel comparator U2B, and serves as an electric signal monitoring output end Vout.

[0032] In order to ensure that the voltage entering the dual-channel comparator is more stable, in an embodiment of the present application, the electric signal monitoring circuit of the present application further comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3. Among them, the first capacitor C1 is connected in parallel with the fourth resistor R4, the second capacitor C2 is connected in parallel with the fifth resistor R5, and the third capacitor C3 is connected in parallel with the second resistor R2, which are respectively used for filtering the voltage on the corresponding resistor. In addition, the electric signal monitoring circuit of the present application further comprises a fourth capacitor C4. One end of the fourth capacitor C4 is connected with the power supply voltage VCC, and the other end is grounded GND, which is used for filtering the power supply voltage VCC.

[0033] In an embodiment of the present application, the electric signal monitoring circuit of the present application further comprises a switch S1 and a precision resistor R7; one end of the switch S1 is connected with the electric signal input end Signal_In, and the other end is connected with the precision resistor R7 in series and then grounded GND. Preferably, the switch S1 adopts a key switch.

[0034] The working process of the electric signal monitoring circuit of the present application is described in detail below.

[0035] (1) When the voltage signal is inputted from the electric signal input end Signal_In, the switch S1 is disconnected.

[0036] Among them, the voltage signal inputted from the electric signal input end Signal_In is divided by the first resistor R2 and the second resistor R2, and then the voltage is inputted into the negative input end of the first dual-channel comparator U2A and the positive input end of the second dual-channel comparator U2B respectively. Therefore, the range of monitoring electric signal can be effectively expanded by adjusting the voltage division ratio of the first resistor R2 and the second resistor R2.

[0037] The power supply voltage VCC is divided by the third resistor R3, the fourth resistor R4 and the fifth resistor R5, and then the voltage is inputted into the positive input end of the first dual-channel comparator U2A, and the voltage is inputted into the positive input end of the second dual-channel comparator U2B.

[0038] The output ends of the first dual-path comparator U2A and the second dual-path comparator U2B are connected together to form a wired-AND logic. The comparator that can make the output end realize the wired-AND logic must be a collector output structure, i.e. an OC gate. Therefore, the first dual-path comparator U2A and the second dual-path comparator U2B both adopt a comparator of the collector open circuit output stage (also referred to as an OC gate output stage) type. The sixth resistor R6 is connected to the output ends of the first dual-path comparator U2A and the second dual-path comparator U2B as a pull-up resistor, thereby ensuring the effective output of high and low levels.

[0039] Therefore, the correspondence between the electrical signal input end and the electrical signal monitoring output end is shown in Table 1.

[0040] Table 1, logical relationship between the electrical signal input end and the electrical signal monitoring output end

[0041] Range of VIN U2A output U2B output Vout Is in normal range VIN > VREFH > VREFL 0 1 0 Upper out-of-range VREFL < VIN < VREFH 1 1 1 Normal range VIN < VREFL < VREFH 1 0 0 Lower out-of-range

[0042] Therefore, the voltage VIN can be monitored based on the set voltages VREFH and VREFL. The voltages VREFH and VREFL can be set and adjusted according to the supply voltage VCC, the third resistor R3, the fourth resistor R4 and the fifth resistor R5, thereby meeting the needs of different application scenarios. The VIN is determined by the first resistor R1, the second resistor R2 and the electrical signal input end Signal_In, and the voltage signal monitoring range can be expanded by adjusting the first resistor R1 and the second resistor R2. Therefore, through the above judgment, it can be known whether the input voltage signal is within the preset range.

[0043] (2) When the electrical signal input end Signal_In inputs a current signal, the switch S2 is closed.

[0044] When the electrical signal input end Signal_In inputs a current signal, the switch S2 is closed, and the precision resistor R7 converts the current signal into a voltage signal and provides the voltage signal to the first resistor R1 and the second resistor R2 in series. The subsequent processing is consistent with the case where the electrical signal input end directly inputs a voltage signal, and therefore is not described here again. Finally, it can be judged whether the input current signal is within the preset range.

[0045] In an embodiment of the present application, the electrical signal monitoring circuit of the present application further comprises a pre-warning module connected to the electrical signal monitoring output end Vout, for issuing a pre-warning when the electrical signal monitoring output end outputs a low level. For example, an LED is connected to the electrical signal monitoring output end. When the LED is lit, it indicates that the monitored electrical signal is within the preset range; when the LED is extinguished, it indicates that the monitored electrical signal is not within the preset range, thereby enabling timely processing.

[0046] In summary, the electric signal monitoring circuit of the present application can realize wide-range electric signal monitoring, and can effectively expand the monitoring range through voltage division, thereby meeting the needs of different application scenarios; can monitor voltage or current signals, and timely give a warning when the monitored signal exceeds the preset range, so that the system can timely learn the abnormal state of the monitored signal, effectively improving the safety and reliability of the monitored signal; the circuit structure is simple, easy to realize, low in cost and strong in operability. Therefore, the present application effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0047] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An electrical signal monitoring circuit, characterized by: The first resistance, the second resistance, the third resistance, the fourth resistance, the fifth resistance, the sixth resistance, the first dual-channel comparator and the second dual-channel comparator are included. One end of the first resistance is connected with the electric signal input end, and the other end is connected with the second resistance in series and then grounded. One end of the third resistance is connected with the power supply voltage, and the other end is connected with the fourth resistance and the fifth resistance in series and then grounded. The positive input end of the first dual-channel comparator is connected with the connection end of the third resistance and the fourth resistance, and the negative input end is connected with the connection end of the first resistance and the second resistance. The positive input end of the second dual-channel comparator is connected with the connection end of the first resistance and the second resistance, and the negative input end is connected with the connection end of the fourth resistance and the fifth resistance. One end of the sixth resistance is connected with the power supply voltage, and the other end is connected with the output end of the first dual-channel comparator and the output end of the second dual-channel comparator, and serves as the electric signal monitoring output end. Wherein, the voltage of the connection end of the first resistance and the second resistance is set as VIN, the voltage of the connection end of the third resistance and the fourth resistance is set as VREFH, and the voltage of the connection end of the fourth resistance and the fifth resistance is set as VREFL. When VIN>VREFH>VREFL, the electric signal monitoring output end outputs low level. When VREFL<VIN<VREFH, the electric signal monitoring output end outputs high level. When VIN<VREFL<VREFH, the electric signal monitoring output end outputs low level.

2. The electrical signal monitoring circuit of claim 1, wherein: The first capacitor is further included, which is connected with the fourth resistance in parallel.

3. The electrical signal monitoring circuit of claim 1, wherein: The second capacitor is further included, which is connected with the fifth resistance in parallel.

4. The electrical signal monitoring circuit of claim 1, wherein: The third capacitor is further included, which is connected with the second resistance in parallel.

5. The electrical signal monitoring circuit of claim 1, wherein: The fourth capacitor is further included, one end of which is connected with the power supply voltage, and the other end is grounded.

6. The electrical signal monitoring circuit of claim 1, wherein: The switch and the precision resistance are further included, one end of the switch is connected with the electric signal input end, and the other end is connected with the precision resistance in series and then grounded.

7. The electrical signal monitoring circuit of claim 6, wherein: The switch adopts a key switch.

8. The electrical signal monitoring circuit of claim 6, wherein: When the electric signal input end inputs voltage signal, the switch is turned off; when the electric signal input end inputs current signal, the switch is turned on.

9. The electrical signal monitoring circuit of claim 1, wherein: The early warning module is further included, which is connected with the electric signal monitoring output end, and is used for issuing early warning when the electric signal monitoring output end outputs low level.

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