A visual operational amplifier failure detection circuit

Abstract

The present invention discloses a visual operational amplifier failure detection circuit, which belongs to the field of household electrical appliances, and includes a power supply, a device to be detected, a device function detection circuit, and a detection result display device. The device to be detected, the device function detection circuit, and the detection result display device are all connected to the power supply, and the power supply is used to provide the circuit with a working voltage and current; the device to be detected is connected to the input end of the device function detection circuit, and the output end of the device function detection circuit is connected to the detection result display device; the device to be detected is used to connect the operational amplifier to be detected; and the device function detection circuit is used to detect and judge the function of the operational amplifier to be detected. The present invention can intuitively judge whether the operational amplifier is failed, which provides convenience for a large number of circuit board maintenance personnel and personnel who need to detect device failure, saves the inconvenience of measuring resistance values ​​one by one and comparing values ​​one by one, improves the efficiency of judging whether the device is failed, and saves time.

Description

Technical Field

[0001] The invention relates to the field of household electrical appliances, in particular to a visual operational amplifier failure detection circuit. Background Art

[0002] Home appliances and other electrical equipment are increasingly used in our daily lives, making our daily lives more convenient. In life, various home appliances and small appliances may not work or be damaged due to long-term use, aging of components, and the use environment. Therefore, professionals are needed to repair the circuit boards. Professionals need to use appropriate tools to quickly determine the fault location, failed components, and failure causes.

[0003] Under normal circumstances, maintenance personnel generally use a multimeter to inspect circuit boards. However, when using a multimeter to measure the resistance and voltage drop of a device, it is often necessary to compare the test values ​​with the normal circuit board one by one to determine whether the device is normal. This method is relatively time-consuming and laborious. Therefore, a circuit that can intuitively determine whether the operational amplifier is failed is needed to solve the problem. Summary of the invention

[0004] With regard to the above problems existing in the prior art, the object of the present invention is to provide a visual operational amplifier failure detection circuit to solve the above problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A visual operational amplifier failure detection circuit comprises a power supply, a device to be detected, a device function detection circuit and a detection result display device, wherein the device to be detected, the device function detection circuit and the detection result display device are all connected to the power supply, which is a power supply VCC; the device to be detected is connected to an input end of the device function detection circuit, and an output end of the device function detection circuit is connected to the detection result display device;

[0007] The detection result display device includes a white light LED1, a green light LED2, a green light LED3 and a red light LED4;

[0008] The device function detection circuit includes an operational amplifier IC1B, an operational amplifier IC2B, an AND gate IC3, a transistor P1 and a transistor N1;

[0009] The power source VCC is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive electrode of the white light LED1, and the negative electrode of the white light LED1 is grounded;

[0010] One end of the resistor R2 is connected to the power supply VCC, the other end of the resistor R2 is connected to one end of the adjustable resistor R12, the other end of the adjustable resistor R12 is grounded, and the adjustment end of the adjustable resistor R12 is connected to the positive input end of the operational amplifier IC1B and the positive input end of the operational amplifier IC2B;

[0011] The negative input terminal of the operational amplifier IC1B is connected to the negative input terminal of the operational amplifier IC2B;

[0012] The positive input terminal of the operational amplifier IC1B is connected to the in-phase probe, the negative input terminal of the operational amplifier IC1B is connected to the inverting probe, the output terminal of the operational amplifier IC1B is connected to the output probe, and the device to be detected is connected to the operational amplifier IC1B through the in-phase probe, the inverting probe, and the output probe;

[0013] The output terminal of the operational amplifier IC1B is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to an input terminal A of the AND gate IC3;

[0014] The output terminal of the operational amplifier IC2B is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to another input terminal B of the AND gate IC3;

[0015] The output end of the operational amplifier IC2B is connected to the positive electrode of the green light LED2, the negative electrode of the green light LED2 is connected to one end of the resistor R7, and the other end of the resistor R7 is grounded;

[0016] The output end of the AND gate IC3 is connected to the base of the transistor N1 and one end of the resistor R8 at the same time, and the other end of the resistor R8 is connected to the base of the transistor P1;

[0017] The collector of transistor N1 is connected to one end of resistor R10, one end of resistor R10 is connected to the cathode of green light LED3, the anode of green light LED3 is connected to power supply VCC; the emitter of transistor N1 is grounded;

[0018] The emitter of transistor P1 is connected to the power supply VCC;

[0019] The collector of the transistor P1 is connected to the positive electrode of the red light LED4, the negative electrode of the red light LED4 is connected to one end of the resistor R11, and the other end of the resistor R11 is grounded.

[0020] As a further solution of the present invention: the negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded;

[0021] The negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the power supply VCC.

[0022] As a further solution of the present invention: an input terminal A of the AND gate IC3 is connected to one end of the resistor R8, and the other end of the resistor R8 is grounded.

[0023] As a further solution of the present invention: the power supply terminal of the operational amplifier IC1B and the power supply terminal of the operational amplifier IC2B are both connected to the power supply VCC, and the ground terminal of the operational amplifier IC1B and the ground terminal of the operational amplifier IC2B are connected to GND;

[0024] A power terminal of the AND gate IC3 is connected to the power source VCC, and a ground terminal of the AND gate IC3 is connected to GND.

[0025] As a further solution of the present invention: the power supply is used to provide working voltage and current.

[0026] As a further solution of the present invention: the device to be detected is used to connect to the operational amplifier IC1B to be detected.

[0027] As a further solution of the present invention: the device function detection circuit is used to detect and judge the function of the operational amplifier to be detected.

[0028] As a further solution of the present invention: the detection result display device is used to visually display the judgment result.

[0029] As a further solution of the present invention: the white light LED1 is used for normal power supply of the function detection circuit of the display device.

[0030] As a further solution of the present invention: the green light LED2 is used to determine whether the voltage at the in-phase terminal of the operational amplifier IC2B is greater than the voltage at the reverse terminal.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention realizes efficient visual judgment of whether the operational amplifier fails by using devices such as operational amplifiers and logic gates. The operational amplifier has a comparison function and can realize a comparator. When the operational amplifier works in an open loop or positive feedback state, if the potential of the in-phase end is greater than the potential of the reverse end, the output pin of the operational amplifier is a high potential; if the potential of the in-phase end is less than the potential of the reverse end, the output pin of the operational amplifier is a low potential. Therefore, the corresponding signals can be respectively connected to the pins of the operational amplifier to be tested, and then the function of the operational amplifier is judged to be normal according to the potential of the output pin. And an LED indicator light is added to the output pin to intuitively display whether the operational amplifier fails. It can intuitively judge whether the operational amplifier fails, which provides convenience for a large number of circuit board maintenance personnel and personnel who need to detect device failure, saves the inconvenience of measuring resistance values ​​one by one and comparing values ​​one by one, improves the efficiency of judging whether the device fails, and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a principle block diagram of a visual operational amplifier failure detection circuit disclosed in an embodiment.

[0034] Figure 2 The present invention is a circuit diagram of a visual operational amplifier failure detection circuit disclosed in an embodiment.

[0035] The reference numerals in the figure are: 1. power supply; 2. device to be tested; 3. device function test; 4. test result display. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1-2 A visual operational amplifier failure detection circuit comprises a power supply 1, a device to be detected 2, a device function detection circuit 3 and a detection result display device 4, wherein the device to be detected 2, the device function detection circuit 3 and the detection result display device are all connected to the power supply 1, and the power supply 1 is a power supply VCC; the power supply 1 is used to provide a working voltage and current for the circuit;

[0039] The device to be detected 2 is connected to the input end of the device function detection circuit 3, and the output end of the device function detection circuit 3 is connected to the detection result display device 4; the device to be detected 2 is used to connect the operational amplifier to be detected; the device function detection circuit 3 is used to detect and judge the function of the operational amplifier to be detected;

[0040] The detection result display device 4 includes a white light LED1, a green light LED2, a green light LED3 and a red light LED4; the detection result display device 4 is used to visually display the judgment result, and the white indicator light LED1 is used to display whether the detection circuit is normally powered;

[0041] The device function detection circuit 3 includes an operational amplifier IC1B, an operational amplifier IC2B, an AND gate IC3, a transistor P1 and a transistor N1;

[0042] One end of the resistor R1 is connected to the power source VCC, the other end of the resistor R1 is connected to the positive electrode of the white light LED1, and the negative electrode of the white light LED1 is grounded;

[0043] One end of the resistor R2 is connected to the power supply VCC, the other end of the resistor R2 is connected to one end of the adjustable resistor R12, the other end of the adjustable resistor R12 is grounded, and the adjustment end of the adjustable resistor R12 is connected to the positive input end of the operational amplifier IC1B and the positive input end of the operational amplifier IC2B;

[0044] The negative input terminal of the operational amplifier IC1B is connected to the negative input terminal of the operational amplifier IC2B;

[0045] The negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded;

[0046] The negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the power supply VCC;

[0047] The positive input terminal of the operational amplifier IC1B is connected to the in-phase probe, the negative input terminal of the operational amplifier IC1B is connected to the inverting probe, the output terminal of the operational amplifier IC1B is connected to the output probe, and the device to be detected 2 is connected to the operational amplifier IC1B via the in-phase probe, the inverting probe, and the output probe;

[0048] The output terminal of the operational amplifier IC1B is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to an input terminal A of the AND gate IC3;

[0049] The output terminal of the operational amplifier IC2B is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to another input terminal B of the AND gate IC3;

[0050] An input terminal A of the AND gate IC3 is connected to one end of the resistor R8, and the other end of the resistor R8 is grounded;

[0051] The output end of the operational amplifier IC2B is connected to the positive electrode of the green light LED2, the negative electrode of the green light LED2 is connected to one end of the resistor R7, and the other end of the resistor R7 is grounded;

[0052] The output end of the AND gate IC3 is connected to the base of the transistor N1 and one end of the resistor R8 at the same time, and the other end of the resistor R8 is connected to the base of the transistor P1;

[0053] The collector of transistor N1 is connected to one end of resistor R10, one end of resistor R10 is connected to the cathode of green light LED3, the anode of green light LED3 is connected to power supply VCC; the emitter of transistor N1 is grounded;

[0054] The emitter of transistor P1 is connected to the power supply VCC;

[0055] The collector of transistor P1 is connected to the positive electrode of red light LED4, the negative electrode of red light LED4 is connected to one end of resistor R11, and the other end of resistor R11 is grounded;

[0056] The power supply terminal of the operational amplifier IC1B and the power supply terminal of the operational amplifier IC2B are both connected to the power supply VCC, and the ground terminal of the operational amplifier IC1B and the ground terminal of the operational amplifier IC2B are connected to GND;

[0057] A power terminal of the AND gate IC3 is connected to the power source VCC, and a ground terminal of the AND gate IC3 is connected to GND.

[0058] Resistor R1 and LED1 white indicator light are connected between power supply VCC and GND, which is used to show whether the detection circuit is powered normally. Resistor R2 and adjustable resistor R12 divide the voltage of VCC, and the divided voltage is provided to the in-phase terminal Vp of operational amplifier IC1B (operational amplifier to be detected) and IC2B. Resistors R3 and R4 divide the voltage of VCC, and the divided voltage is provided to the reverse terminal Vn of operational amplifier IC1B and IC2B. LED2 green indicator light is used to determine whether the in-phase terminal voltage of IC2B is greater than the reverse terminal voltage. If it is greater, LED2 indicator light is on, and IC2B outputs a high level; if it is less than, LED2 indicator light is off, and IC2B outputs a low level. Device IC3 is an AND logic gate. When both A and B pins are high, output Y is also high. When A and B pins are at other levels, output Y is always low. Transistors N1 and P1 are used as a switch. When IC3 outputs a low level, transistor P1 is turned on, the red indicator light LED4 is on, transistor N1 is not turned on, and the green indicator light LED3 is off; when IC3 outputs a high level, transistor P1 is not turned on, the red indicator light LED4 is off, transistor N1 is turned on, and the green indicator light LED3 is on.

[0059] Visual operational amplifier failure detection instructions, by adjusting the resistance of the adjustable resistor R12 to change the voltage of the in-phase input terminal of the operational amplifier to be tested, when the voltage of the in-phase input terminal is greater than the voltage of the reverse input terminal, observe the LED light state, then adjust R12 to make the voltage of the in-phase input terminal less than the voltage of the reverse input terminal, and observe the LED light state. If the voltage of the in-phase input terminal is greater than the voltage of the reverse input terminal, the green lights of LED2 and LED3 are on, and the red light of LED4 is not on; the voltage of the in-phase input terminal is less than the voltage of the reverse input terminal, the green lights of LED2 and LED3 are not on, and the red light of LED4 is on. When the above two states are met, it means that the operational amplifier to be tested is normal and has not failed. If it is other cases, it means that the operational amplifier has not failed. Therefore, the LED light can be used to determine whether the device has failed.

[0060] The present invention provides a device for visually judging whether an operational amplifier is invalid or not, and realizes efficient visual judgment of whether the operational amplifier is invalid or not by adopting devices such as operational amplifiers and logic gates. The operational amplifier has a comparison function and can realize a comparator. When the operational amplifier works in an open loop or positive feedback state, if the potential of the in-phase end is greater than the potential of the reverse end, the output pin of the operational amplifier is a high potential; if the potential of the in-phase end is less than the potential of the reverse end, the output pin of the operational amplifier is a low potential. Therefore, corresponding signals can be respectively connected to the pins of the operational amplifier to be tested, and then the function of the operational amplifier can be judged according to the potential of the output pin. And an LED indicator light is added to the output pin to intuitively display whether the operational amplifier is invalid or not.

[0061] The invention protects a circuit for intuitively judging whether an operational amplifier is invalid. The circuit adopts components such as an operational amplifier, a logic gate, a triode, and an LED lamp.

[0062] The present invention can intuitively judge whether the operational amplifier has failed by adopting a visual detection circuit, which provides convenience for a large number of circuit board maintenance personnel and personnel who need to detect component failure, saves the inconvenience of measuring resistance values ​​one by one and comparing values ​​one by one, improves the efficiency of judging whether the component has failed, and saves time.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention, and any reference numerals in the claims should not be considered as limiting the claims involved.

[0064] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A visual operational amplifier failure detection circuit, characterized in that: The device comprises a power supply (1), a device to be detected (2), a device function detection circuit (3) and a detection result display device (4); the device to be detected (2), the device function detection circuit (3) and the detection result display device are all connected to the power supply (1), and the power supply (1) is a power supply VCC; the device to be detected (2) is connected to the input end of the device function detection circuit (3), and the output end of the device function detection circuit (3) is connected to the detection result display device (4); The detection result display device (4) comprises a white light LED1, a green light LED2, a green light LED3 and a red light LED4; The device function detection circuit (3) comprises an operational amplifier IC1B, an operational amplifier IC2B, an AND gate IC3, a transistor P1 and a transistor N1; The power source VCC is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive electrode of the white light LED1, and the negative electrode of the white light LED1 is grounded; One end of the resistor R2 is connected to the power supply VCC, the other end of the resistor R2 is connected to one end of the adjustable resistor R12, the other end of the adjustable resistor R12 is grounded, and the adjustment end of the adjustable resistor R12 is connected to the positive input end of the operational amplifier IC1B and the positive input end of the operational amplifier IC2B; The negative input terminal of the operational amplifier IC1B is connected to the negative input terminal of the operational amplifier IC2B; The positive input terminal of the operational amplifier IC1B is connected to the in-phase probe, the negative input terminal of the operational amplifier IC1B is connected to the inverting probe, the output terminal of the operational amplifier IC1B is connected to the output probe, and the device to be detected (2) is connected to the operational amplifier IC1B via the in-phase probe, the inverting probe, and the output probe; The output terminal of the operational amplifier IC1B is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to an input terminal A of the AND gate IC3; The output terminal of the operational amplifier IC2B is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to another input terminal B of the AND gate IC3; The output end of the operational amplifier IC2B is connected to the positive electrode of the green light LED2, the negative electrode of the green light LED2 is connected to one end of the resistor R7, and the other end of the resistor R7 is grounded; The output end of the AND gate IC3 is connected to the base of the transistor N1 and one end of the resistor R8 at the same time, and the other end of the resistor R8 is connected to the base of the transistor P1; The collector of transistor N1 is connected to one end of resistor R10, one end of resistor R10 is connected to the cathode of green light LED3, the anode of green light LED3 is connected to power supply VCC; the emitter of transistor N1 is grounded; The emitter of transistor P1 is connected to the power supply VCC; The collector of the transistor P1 is connected to the positive electrode of the red light LED4, the negative electrode of the red light LED4 is connected to one end of the resistor R11, and the other end of the resistor R11 is grounded.

2. A visual operational amplifier failure detection circuit according to claim 1, characterized in that: The negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded; The negative input terminal of the operational amplifier IC2B is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the power supply VCC.

3. A visual operational amplifier failure detection circuit according to claim 2, characterized in that: An input terminal A of the AND gate IC3 is connected to one end of the resistor R8, and the other end of the resistor R8 is grounded.

4. The visual operational amplifier failure detection circuit according to claim 3, characterized in that: The power supply terminal of the operational amplifier IC1B and the power supply terminal of the operational amplifier IC2B are both connected to the power supply VCC, and the ground terminal of the operational amplifier IC1B and the ground terminal of the operational amplifier IC2B are connected to GND; A power terminal of the AND gate IC3 is connected to the power source VCC, and a ground terminal of the AND gate IC3 is connected to GND.

5. The visual operational amplifier failure detection circuit according to claim 4, characterized in that: The power supply (1) is used to provide working voltage and current.

6. The visual operational amplifier failure detection circuit according to claim 1, characterized in that: The device to be detected (2) is used to connect to the operational amplifier IC1B to be detected.

7. The visual operational amplifier failure detection circuit according to claim 6, characterized in that: The device function detection circuit (3) is used to detect and judge the function of the operational amplifier to be detected.

8. The visual operational amplifier failure detection circuit according to claim 7, characterized in that: The detection result display device (4) is used to display the judgment result.

9. The visual operational amplifier failure detection circuit according to claim 1, characterized in that: The white light LED 1 is used to display the normal power supply of the device function detection circuit (3).

10. The visual operational amplifier failure detection circuit according to claim 9, characterized in that: The green LED2 is used to determine whether the voltage at the in-phase terminal of the operational amplifier IC2B is greater than the voltage at the reverse terminal.

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