CN115656621A - Detection circuit and electronic equipment - Google Patents
Detection circuit and electronic equipment Download PDFInfo
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- CN115656621A CN115656621A CN202211295809.2A CN202211295809A CN115656621A CN 115656621 A CN115656621 A CN 115656621A CN 202211295809 A CN202211295809 A CN 202211295809A CN 115656621 A CN115656621 A CN 115656621A
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Abstract
The embodiment of the application provides a detection circuit and electronic equipment, the detection circuit comprises a first total input end, a first isolation module, a first inversion module and a first total output end. The input end of the first isolation module is connected with the first total input end and used for providing input impedance for the electric signal to be tested input from the first total input end; the input end of the first inverting module is connected with the output end of the first isolating module and is used for inverting the voltage output by the first isolating module; the first total output end is connected with the output end of the first inverting module. By arranging the isolation module and the phase inversion module, the voltage of the negative voltage power supply can be converted into positive voltage, so that the negative voltage can be detected by adopting the existing detection equipment or detection case aiming at the positive voltage.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a detection circuit and electronic equipment.
Background
The power supply power detection is to detect the voltage and/or current of the power supply under the condition of load. With the development of electronic circuit technology, many devices or circuits need to use a negative voltage power supply, for example, a driving circuit of some Thin Film Transistor (TFT), a sensor, and other devices need to use a negative voltage power supply. However, both the general power supply power detection device and the detection example are designed for a positive voltage power supply, and are difficult to be used for testing a negative voltage power supply.
Disclosure of Invention
In order to overcome the technical problems mentioned in the technical background, an embodiment of the present application provides a detection circuit, including:
a first bus input terminal;
the input end of the first isolation module is connected with the first total input end and used for providing input impedance for the electric signal to be tested input from the first total input end;
the input end of the first inverting module is connected with the output end of the first isolating module and is used for inverting the voltage output by the first isolating module;
and the first total output end is connected with the output end of the first inverting module.
In one possible implementation, the detection circuit further includes:
a second main input;
the input end of the second isolation module is connected with the second main input end and used for providing input impedance for the electric signal to be tested input from the second main input end;
the input end of the second inverting module is connected with the output end of the second isolating module and is used for inverting the voltage output by the second isolating module;
the input end of the comparison module is respectively connected with the output ends of the first phase inversion module and the second phase inversion module, and the comparison module is used for calculating and outputting the voltage difference of the output voltages of the first phase inversion module and the second phase inversion module;
and the second total output end is connected with the output end of the comparison module.
In one possible implementation, the detection circuit further includes:
and the detection resistor is connected between the first total input end and the second total input end and is used for being connected in series with a load loop to be detected of the negative power supply.
In one possible implementation, the detection circuit further includes:
the first isolation module is connected with the first general input end through the diode; one end of the detection resistor is connected between the first isolation module and the diode, and the other end of the detection resistor is connected between the second isolation module and the second main input end.
In one possible implementation, the first isolation module includes a first operational amplifier; the non-inverting input end of the first operational amplifier is connected with the first total input end; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier; the output end of the first operational amplifier is the output end of the first isolation module;
the first inverting module comprises a second operational amplifier, and an inverting input end of the second operational amplifier is connected with an output end of the first operational amplifier through a first resistor and is connected with an output end of the second operational amplifier through a second resistor; the resistance values of the first resistor and the second resistor are equal; the non-inverting input end of the second operational amplifier is grounded through a third resistor; the output end of the second operational amplifier is the output end of the first inverting module.
In one possible implementation, the first operational amplifier and the second operational amplifier are operational amplifiers with rail-to-rail functionality.
In a possible implementation manner, the second isolation module includes a third operational amplifier, and a non-inverting input terminal of the third operational amplifier is connected to the second total input terminal; the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier; the output end of the third operational amplifier is the output end of the second isolation module;
the second inverting module comprises a fourth operational amplifier, and an inverting input end of the fourth operational amplifier is connected with an output end of the third operational amplifier through a fourth resistor and is connected with an output end of the fourth operational amplifier through a fifth resistor; the fourth resistor and the fifth resistor have the same resistance value; the non-inverting input end of the fourth operational amplifier is grounded through a sixth resistor; the output end of the fourth operational amplifier is the output end of the second inverting module;
the comparison module comprises a fifth operational amplifier; the non-inverting input end of the fifth operational amplifier is connected with the output end of the first inverting module through a seventh resistor and is grounded through an eighth resistor; the inverting input end of the fifth operational amplifier is connected with the output end of the second inverting module through a ninth resistor and is connected with the output end of the fifth operational amplifier through a tenth resistor; the seventh resistor, the eighth resistor, the ninth resistor and the tenth resistor have the same resistance value; and the output end of the fifth operational amplifier is the output end of the comparison module.
In one possible implementation, the third operational amplifier, the fourth operational amplifier, and the fifth operational amplifier are operational amplifiers with a rail-to-rail function.
In a possible implementation manner, the detection circuit further includes a positive voltage test device, and the positive voltage test device is connected to the first total output terminal and/or the second total output terminal, and is configured to detect an electrical signal output by the first total output terminal and/or the second total output terminal to perform a voltage and/or current test.
Another object of the present application is to provide an electronic device, which includes the detection circuit provided in the present application.
Compared with the prior art, the method has the following beneficial effects:
the application provides a detection circuitry and electronic equipment through setting up isolation module and opposition module, can convert the voltage of negative voltage power supply into the positive voltage to can adopt existing check out test set or the detection case to the positive voltage to detect negative voltage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic diagram of a detection circuit according to an embodiment of the present disclosure;
FIG. 2 is a second schematic diagram of a detection circuit according to an embodiment of the present disclosure;
FIG. 3 is a third schematic diagram of a detection circuit according to an embodiment of the present disclosure;
FIG. 4 is a fourth schematic diagram of a detection circuit according to an embodiment of the present application;
FIG. 5 is a fifth schematic diagram of a detection circuit according to an embodiment of the present application;
FIG. 6 is a sixth schematic diagram of a detection circuit according to an embodiment of the present application;
fig. 7 is a seventh schematic diagram of a detection circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is noted that the terms "first", "second", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
It should be noted that, in case of conflict, different features in the embodiments of the present application may be combined with each other.
Referring to fig. 1, fig. 1 is a block diagram of a detection circuit according to the present embodiment. The detection circuit may include a first total input terminal IN1, a first isolation module M1, a first inversion module M2, and a first total output terminal Vout1.
The input end of the first isolation module M1 is connected with the first total input end IN1 and used for providing input impedance for the electric signal to be tested input from the first total input end IN 1. The first isolation module M1 is used for avoiding the influence of a rear-end test circuit on a negative voltage load loop to be tested.
The input end of the first inverting module M2 is connected to the output end of the first isolating module M1, and is configured to invert the voltage output by the first isolating module M1. For example, the first inverting module M2 may be configured to convert the input negative voltage into a positive voltage, and the absolute value of the voltage value of the input negative voltage is equal to the absolute value of the voltage value of the output positive voltage.
The first total output end Vout1 is connected to an output end of the first inverting module M2.
Referring to fig. 2, the negative voltage load circuit to be tested may generally include a negative voltage source V1 to be tested and a load Rload to be tested. IN the using process, the first total input end IN1 can be connected between the power supply of the load Rload to be tested and the load Rload to be tested, and then the first total output end Vout1 is connected to the positive voltage testing device. In this way, by arranging the first isolation module and the first inversion module, the voltage of the negative voltage power supply can be converted into a positive voltage, so that the negative voltage can be detected by adopting the existing detection equipment or detection case for the positive voltage.
IN a possible implementation manner, referring to fig. 3, the detection circuit may further include a second total input terminal IN2, a second isolation module M3, a second inversion module M4, and a comparison module M5.
The input end of the second isolation module M3 is connected to the second total input end IN2, and is configured to provide input impedance for the electrical signal to be tested input from the second total input end IN 2. And the second isolation module M3 is used for avoiding the influence of the rear-end test circuit on the negative voltage load loop to be tested. The second isolation module M3 may be a module having the same structure and function as the first isolation module M1.
The input end of the second inverting module M4 is connected to the output end of the second isolating module M3, and is configured to invert the voltage output by the second isolating module M3. For example, the second inverting module M4 may be configured to convert the input negative voltage into a positive voltage, and the absolute value of the voltage value of the input negative voltage is equal to the absolute value of the voltage value of the output positive voltage. The second inverting module M4 may be a module having the same structure and function as the first inverting module M2.
The input end of the comparison module M5 is connected to the output ends of the first inversion module M2 and the second inversion module M4, respectively, and the comparison module M5 is configured to calculate and output a voltage difference between output voltages of the first inversion module M2 and the second inversion module M4. The second total output terminal Vout2 is connected to the output terminal of the comparison module M5.
Referring to fig. 4, the negative voltage load loop to be tested at least includes a negative voltage power supply V1 to be tested and a load Rload to be tested, and may further include other resistors. IN the using process, the first total input end IN1 can be connected between a load Rload power supply to be tested and the load Rload to be tested, and then the first total output end Vout1 is connected to a positive voltage testing device, so that the voltage of the negative voltage power supply V1 to be tested can be tested. A resistor connected IN series IN the negative voltage load circuit can be used as a detection resistor Rsense, the second total input terminal IN2 is connected to the negative voltage load circuit to be detected, the first total input terminal IN1 and the second total input terminal IN2 are respectively connected to two ends of the detection resistor Rsense, and then the second total output terminal Vout2 is connected to a positive voltage test device. Therefore, the load current Iload in the negative voltage load circuit to be measured can be calculated according to the voltage difference output by the second total output terminal Vout2 and the resistance value of the detection resistor Rsense. Specifically, iload = - (Vout 2/Rsense). In addition, the load voltage Vload on the load Rload to be measured can be calculated according to the voltages output by the first total output terminal Vout1 and the second total output terminal Vout2, specifically, vload = - (Vout 1-Vout 2).
In some possible implementations, referring to fig. 5, the first isolation module M1 includes a first operational amplifier U1. The non-inverting input of the first operational amplifier U1 is connected to the first global input IN 1. The inverting input end of the first operational amplifier U1 is connected with the output end of the first operational amplifier U1. The output end of the first operational amplifier U1 is the output end of the first isolation module M1.
The first inverting module M2 includes a second operational amplifier U2, and an inverting input terminal of the second operational amplifier U2 is connected to an output terminal of the first operational amplifier U1 through a first resistor R1 and is connected to an output terminal of the second operational amplifier U2 through a second resistor R2. The first resistor R1 and the second resistor R2 have the same resistance value. The non-inverting input end of the second operational amplifier U2 is grounded through a third resistor R3. The output end of the second operational amplifier U2 is the output end of the first inverting module M2.
Optionally, the first operational amplifier U1 and the second operational amplifier U2 are operational amplifiers with rail-to-rail functionality.
Further, the negative power source terminal VEE of the first operational amplifier U1 and the second operational amplifier U2 may be connected to the negative power source V1 to be detected, and the positive power source terminal VCC of the first operational amplifier U1 and the second operational amplifier U2 may be connected to the same positive power source V2. The absolute values of the output voltages of the negative voltage power supply V1 to be detected and the positive voltage power supply V2 can be equal. For example, the rated output voltage of the negative voltage power supply V1 to be measured may be-12V, and the rated output voltage of the positive voltage power supply V2 may be +12V.
IN some possible implementations, referring again to fig. 5, the second isolation module M3 includes a third operational amplifier U3, and a non-inverting input terminal of the third operational amplifier U3 is connected to the second total input terminal IN 2. And the inverting input end of the third operational amplifier U3 is connected with the output end of the third operational amplifier U3. The output end of the third operational amplifier U3 is the output end of the second isolation module M3.
The second inverting module M4 includes a fourth operational amplifier U4, and an inverting input terminal of the fourth operational amplifier U4 is connected to an output terminal of the third operational amplifier U3 through a fourth resistor, and is connected to an output terminal of the fourth operational amplifier U4 through a fifth resistor R5. The fourth resistor and the fifth resistor R5 have the same resistance value. The non-inverting input end of the fourth operational amplifier U4 is grounded through a sixth resistor R6. The output end of the fourth operational amplifier U4 is the output end of the second inverting module M4.
The comparison module M5 includes a fifth operational amplifier U5. The non-inverting input end of the fifth operational amplifier U5 is connected to the output end of the first inverting module M2 through a seventh resistor R7, and is grounded through an eighth resistor R8. The inverting input terminal of the fifth operational amplifier U5 is connected to the output terminal of the second inverting module M4 through a ninth resistor R9, and is connected to the output terminal of the fifth operational amplifier U5 through a tenth resistor R10. The seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 have the same resistance value. The output end of the fifth operational amplifier U5 is the output end of the comparison module M5.
Optionally, the third operational amplifier U3, the fourth operational amplifier U4, and the fifth operational amplifier U5 are operational amplifiers with rail-to-rail functionality.
Further, negative power supply terminals VEE of the third operational amplifier U3, the fourth operational amplifier U4, and the fifth operational amplifier U5 may be connected to the negative voltage power supply V1 to be detected, and positive power supply terminals VCC of the third operational amplifier U3, the fourth operational amplifier U4, and the fifth operational amplifier U5 may be connected to the same positive voltage power supply V2. The absolute values of the output voltages of the negative voltage power supply V1 to be detected and the positive voltage power supply V2 can be equal. For example, the rated output voltage of the negative voltage power supply V1 to be measured may be-12V, and the rated output voltage of the positive voltage power supply V2 may be +12V.
In another possible implementation manner, referring to fig. 6, the detection circuit may further include a detection resistor Rsense. The detection resistor Rsense is connected between the first total input end IN1 and the second total input end IN2, and is used for being connected IN series with a load Rload loop to be detected of a negative power supply. Referring to fig. 6 again, IN use, the first total input terminal IN1 and the second total input terminal IN2 may be connected IN series between the negative voltage power supply to be measured and the load Rload to be measured IN the negative voltage load loop to be measured.
IN another possible implementation manner, referring to fig. 7, the detection circuit further includes a diode D1, and the first isolation module M1 is connected to the first total input terminal IN1 through the diode D1. One end of the detection resistor Rsense is connected between the first isolation module M1 and the diode D1, and the other end is connected between the second isolation module M3 and the second total input end IN 2. The diode D1 is used to prevent current from flowing backward and can provide a forward voltage drop, so that the absolute value of the voltage input to the inverting input terminal of each operational amplifier circuit is not greater than the absolute value of the voltage input to the negative power supply terminal VEE.
In a possible implementation manner, the detection circuit further includes a positive voltage testing device, and the positive voltage testing device is connected to the first total output terminal Vout1 and/or the second total output terminal Vout2, respectively, and is configured to detect an electrical signal output by the first total output terminal Vout1 and/or the second total output terminal Vout2 to perform a voltage and/or current test.
The application also provides an electronic device, which comprises the detection circuit provided by the application. In one example, the electronic device may be a programmable power supply, the detection circuit is a sampling and reading circuit for a negative voltage current signal in the programmable power supply, and the detection circuit may be matched with a same analog-to-digital conversion circuit to read a set voltage current and feed back the set voltage current to the controller, and the controller performs fine adjustment on the output voltage current according to a true value of a current sampling value, thereby implementing closed-loop control and improving the output accuracy of the programmable power supply. In another example, the electronic device may be a real-time voltage and current monitor, and the detection circuit may be a negative voltage and current signal sampling circuit in the real-time voltage and current monitor, which may be used to collect negative voltage and current and convert the collected negative voltage and current into corresponding positive voltage and current, so as to cooperate with a general positive power reading circuit.
To sum up, the detection circuit and the electronic device provided by the application can convert the voltage of the negative voltage power supply into the positive voltage by arranging the isolation module and the inversion module, so that the negative voltage can be detected by adopting the existing detection equipment or detection case for the positive voltage.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A detection circuit, characterized in that the detection circuit comprises:
a first bus input terminal;
the input end of the first isolation module is connected with the first total input end and used for providing input impedance for the electric signal to be tested input from the first total input end;
the input end of the first inverting module is connected with the output end of the first isolating module and is used for inverting the voltage output by the first isolating module;
and the first total output end is connected with the output end of the first inverting module.
2. The detection circuit of claim 1, further comprising:
a second main input;
the input end of the second isolation module is connected with the second general input end and used for providing input impedance for the electric signal to be tested input from the second general input end;
the input end of the second inverting module is connected with the output end of the second isolating module and is used for inverting the voltage output by the second isolating module;
the input end of the comparison module is respectively connected with the output ends of the first inversion module and the second inversion module, and the comparison module is used for calculating and outputting the voltage difference of the output voltages of the first inversion module and the second inversion module;
and the second total output end is connected with the output end of the comparison module.
3. The detection circuit of claim 2, further comprising:
and the detection resistor is connected between the first total input end and the second total input end and is used for being connected in series with a load loop to be detected of the negative power supply.
4. The detection circuit of claim 3, further comprising:
the first isolation module is connected with the first general input end through the diode; one end of the detection resistor is connected between the first isolation module and the diode, and the other end of the detection resistor is connected between the second isolation module and the second main input end.
5. The detection circuit of claim 1, wherein the first isolation module comprises a first operational amplifier; the non-inverting input end of the first operational amplifier is connected with the first total input end; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier; the output end of the first operational amplifier is the output end of the first isolation module;
the first inverting module comprises a second operational amplifier, and an inverting input end of the second operational amplifier is connected with an output end of the first operational amplifier through a first resistor and is connected with an output end of the second operational amplifier through a second resistor; the resistance values of the first resistor and the second resistor are equal; the non-inverting input end of the second operational amplifier is grounded through a third resistor; the output end of the second operational amplifier is the output end of the first inverting module.
6. The detection circuit of claim 5, wherein the first operational amplifier and the second operational amplifier are operational amplifiers with rail-to-rail functionality.
7. The detection circuit of claim 2, wherein the second isolation module comprises a third operational amplifier having a non-inverting input connected to the second common input; the inverting input end of the third operational amplifier is connected with the output end of the third operational amplifier; the output end of the third operational amplifier is the output end of the second isolation module;
the second inverting module comprises a fourth operational amplifier, and an inverting input end of the fourth operational amplifier is connected with an output end of the third operational amplifier through a fourth resistor and is connected with an output end of the fourth operational amplifier through a fifth resistor; the fourth resistor and the fifth resistor have the same resistance value; the non-inverting input end of the fourth operational amplifier is grounded through a sixth resistor; the output end of the fourth operational amplifier is the output end of the second inverting module;
the comparison module comprises a fifth operational amplifier; the non-inverting input end of the fifth operational amplifier is connected with the output end of the first inverting module through a seventh resistor and is grounded through an eighth resistor; the inverting input end of the fifth operational amplifier is connected with the output end of the second inverting module through a ninth resistor and is connected with the output end of the fifth operational amplifier through a tenth resistor; the seventh resistor, the eighth resistor, the ninth resistor and the tenth resistor have the same resistance value; and the output end of the fifth operational amplifier is the output end of the comparison module.
8. The detection circuit of claim 7, wherein the third operational amplifier, the fourth operational amplifier, and the fifth operational amplifier are operational amplifiers with rail-to-rail functionality.
9. The detection circuit according to claim 2, characterized in that it further comprises a positive voltage test device connected to the first and/or second total output terminals, respectively, for testing the voltage and/or current according to the electrical signals outputted by the first and/or second total output terminals.
10. An electronic device, characterized in that the electronic device comprises a detection circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295809.2A CN115656621A (en) | 2022-10-21 | 2022-10-21 | Detection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295809.2A CN115656621A (en) | 2022-10-21 | 2022-10-21 | Detection circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN115656621A true CN115656621A (en) | 2023-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211295809.2A Pending CN115656621A (en) | 2022-10-21 | 2022-10-21 | Detection circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN115656621A (en) |
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- 2022-10-21 CN CN202211295809.2A patent/CN115656621A/en active Pending
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