Power management unit output detection circuit, circuit board and detection equipment
By designing a power management unit output detection circuit for PMU fault detection, the problem of traditional detection methods relying on disassembly operation is solved, and non-invasive rapid detection is realized, reducing detection risks and improving efficiency.
Patent Information
- Application Number
- CN202421494534.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In the prior art, PMU fault detection methods rely on disassembly operation, and there are problems such as destroying product integrity, introducing new faults, difficulty in in-depth analysis of the causes of failures, and time-consuming and labor-consuming.
Design a power management unit output detection circuit, including a sensing module, a power supply module, a signal amplification module and a detection terminal, capture the key information when the power management unit is output in a non-invasive manner, and use an oscilloscope to display the amplified voltage signal and locate the abnormal branch.
It realizes the abnormal output branch of the power management unit to be quickly detected without disassembly, reducing the risk of secondary damage during the detection process and improving detection efficiency and accuracy.
Smart Images
Figure CN223022347U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of detection circuits, and particularly to an output detection circuit for a power management unit, a circuit board, and a detection device. Background Art
[0002] In modern electronic devices, the power management unit (PMU) is a key circuit component responsible for the distribution, conversion, and monitoring of the power supply of the electronic device, ensuring that each internal functional module receives stable and compliant power supply. However, with the increasing complexity and integration of electronic products, the design of the PMU has become more and more complex, making its fault diagnosis and maintenance a technical challenge.
[0003] Traditional PMU fault detection methods usually rely on disassembly operations and use equipment such as oscilloscopes, multimeters, and thermal imagers for physical-level detection. Although these methods can locate faults to a certain extent, they have many deficiencies. First, the disassembly operation not only destroys the integrity of the product but also may introduce new fault factors, affecting the accuracy of detection. Second, traditional detection methods often can only provide limited fault information and are difficult to deeply analyze the root cause of the fault. Finally, these methods usually require experienced technicians to operate, and the detection process is time-consuming and laborious, with low efficiency. Summary of the Utility Model
[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides an output detection circuit for a power management unit, a circuit board, and a detection device, which can quickly identify abnormal output branches of the power management unit in the product to be tested, perform detection without disassembly, and reduce the risk of secondary damage that may be caused during the detection process.
[0005] In a first aspect, the present application provides an output detection circuit for a power management unit, including:
[0006] A sensing module, the output end of the sensing module is used to connect to the charging end of the product to be tested;
[0007] A power supply module, the output end of the power supply module is connected to the input end of the sensing module, and is used to provide electrical energy to the product to be tested;
[0008] A signal amplification module, the two input ends of the signal amplification module are respectively connected to the input end and the output end of the sensing module;
[0009] A detection terminal, the detection terminal is connected to the output end of the signal amplification module and is used to connect to an oscilloscope to reflect the output performance of the power management unit in the product to be tested according to the waveform detected by the oscilloscope.
[0010] The output detection circuit of the power management unit according to the embodiments of the first aspect of the present application has at least the following beneficial effects: The detection circuit utilizes the characteristics of the capacitor when the voltage changes. That is, at the moment when the power supply branch is turned on, due to the existence of the capacitor, an instantaneous large current will be generated. This characteristic enables the circuit to capture the key information when the power management unit outputs. Through the sensing module, this instantaneous large current can be converted into a measurable voltage signal, and then the voltage signal is amplified by the signal amplification module. By using an oscilloscope to connect to the detection terminal and displaying the amplified voltage signal on the oscilloscope in real time, technicians can judge the output situation of each branch of the power management unit by observing the waveform changes on the oscilloscope, so as to locate the abnormal branch. The traditional detection method usually requires disassembly operation, which not only destroys the integrity of the product but also may introduce new fault factors. This non-invasive detection method not only protects the integrity of the product and can be detected without disassembly but also reduces the risk of secondary damage that may be brought during the detection process.
[0011] According to some embodiments of the first aspect of the present application, the power supply module includes a first switch and a first power supply terminal. The first input terminal of the first switch is connected to the first power supply terminal, the second input terminal of the first switch is used to connect to an external power supply, and the output terminal of the first switch is connected to the input terminal of the sensing module. The first switch is used to select the conduction of its output terminal with the first input terminal or select the conduction of its output terminal with the second input terminal.
[0012] According to some embodiments of the first aspect of the present application, the sensing module includes a sensing resistor. One end of the sensing resistor is connected to the output terminal of the power supply module, and the other end of the sensing resistor is used to connect to the charging terminal of the product to be detected. The two input terminals of the signal amplification module are respectively connected to both ends of the sensing resistor.
[0013] According to some embodiments of the first aspect of the present application, the sensing module further includes a debugging switch, and both ends of the debugging switch are respectively connected to both ends of the sensing resistor.
[0014] According to some embodiments of the first aspect of the present application, the signal amplification module includes an operational amplifier. The non-inverting input terminal of the operational amplifier is connected to the input terminal of the sensing module, the inverting input terminal of the operational amplifier is connected to the output terminal of the sensing module, and the output terminal of the operational amplifier is connected to the detection terminal.
[0015] According to some embodiments of the first aspect of the present application, a differential filtering module is further provided between the sensing module and the signal amplification module. The differential filtering module includes a second resistor, a third resistor, and a first capacitor. One end of the second resistor is connected to the input end of the sensing module, one end of the third resistor is connected to the output end of the sensing module, the two input ends of the signal amplification module are respectively connected to the other ends of the second resistor and the third resistor, and the two ends of the first capacitor are respectively connected to the other ends of the second resistor and the third resistor.
[0016] According to some embodiments of the first aspect of the present application, an output filtering module is further provided between the signal amplification module and the detection terminal. The output filtering module includes a fourth resistor and a second capacitor. The output end of the signal amplification module is connected to the detection terminal through the fourth resistor, and the connection between the fourth resistor and the detection terminal is grounded through the second capacitor.
[0017] According to some embodiments of the first aspect of the present application, a grounding module, the grounding module includes a fifth resistor and a third switch. The two ends of the third switch are respectively connected to the two ends of the fifth resistor. One end of the fifth resistor is used to connect to the ground terminal of the product to be detected, and the other end of the fifth resistor is grounded.
[0018] In a second aspect, the present application further provides a circuit board, including the power management unit output detection circuit according to any one of the embodiments of the first aspect.
[0019] In a third aspect, the present application further provides a detection device, including the circuit board according to the embodiment of the second aspect.
[0020] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings
[0021] The additional aspects and advantages of the present application will become apparent and be easily understood in the description of the embodiments in conjunction with the following drawings, where:
[0022] Figure 1 is a circuit block diagram of the power management unit output detection circuit provided by some embodiments of the present application;
[0023] Figure 2 is a circuit diagram of the power management unit output detection circuit provided by some embodiments of the present application.
[0024] The attached reference numerals are as follows:
[0025] Power management unit output detection circuit 100; sensing module 110; power supply module 120; signal amplification module 130; detection terminal 140; differential filtering module 150; output filtering module 160; grounding module 170; product to be detected 200; external power supply 300. Detailed implementation mode
[0026] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.
[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0028] In the description of the present application, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.
[0029] In the description of the present application, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.
[0030] In modern electronic devices, the power management unit (PMU, Power Management Unit) is a key circuit component responsible for the distribution, conversion, and monitoring of the power supply of the electronic device to ensure that each internal functional module receives stable and required power supply. However, with the increasing complexity and integration of electronic products, the design of the PMU has become more and more complex, making its fault diagnosis and maintenance a technical challenge.
[0031] Traditional PMU fault detection methods usually rely on disassembly operations and use equipment such as oscilloscopes, multimeters, and thermal imagers for physical-level detection. Although these methods can locate faults to a certain extent, they have many deficiencies. First, the disassembly operation not only damages the integrity of the product but may also introduce new fault factors, affecting the accuracy of detection. Second, traditional detection methods often provide only limited fault information and are difficult to deeply analyze the root causes of faults. Finally, these methods usually require experienced technicians to operate, and the detection process is time-consuming and laborious, with low efficiency.
[0032] Based on this, the present application provides a power management unit output detection circuit, a circuit board, and a detection device to solve the above-mentioned technical problems. The technical solutions provided by the present application will be elaborated in detail one by one below.
[0033] In the first aspect, referring to Figure 1 , the present application provides a power management unit output detection circuit 100, including: a sensing module 110, a power supply module 120, a signal amplification module 130, and a detection terminal 140. The output end of the sensing module 110 is used to connect to the charging end of the product to be tested 200; the output end of the power supply module 120 is connected to the input end of the sensing module 110 to provide electrical energy to the product to be tested 200; two input ends of the signal amplification module 130 are respectively connected to the input end and the output end of the sensing module 110; the detection terminal 140 is connected to the output end of the signal amplification module 130 and is used to connect to an oscilloscope to reflect the output performance of the power management unit in the product to be tested 200 according to the waveform detected by the oscilloscope.
[0034] This detection circuit utilizes the characteristics of a capacitor when the voltage changes. That is, at the moment when the power supply branch is turned on, due to the presence of the capacitor, an instantaneous large current will be generated. This characteristic enables the circuit to capture the key information when the power management unit outputs. Through the sensing module 110, this instantaneous large current can be converted into a measurable voltage signal, and then the voltage signal is amplified by the signal amplification module 130. By using an oscilloscope to connect to the detection terminal 140 and displaying the amplified voltage signal in real time on the oscilloscope, technicians can judge the output situation of each branch of the power management unit by observing the waveform changes on the oscilloscope, thereby locating the abnormal branch. Traditional detection methods usually require disassembly operations, which not only damage the integrity of the product but may also introduce new fault factors. This non-invasive detection method not only protects the integrity of the product and can be detected without disassembly but also reduces the risk of secondary damage that may be brought during the detection process.
[0035] When the product under test is powered on, the power management unit (PMU) inside the product under test will have an instantaneous large current at the moment when the power supply branch is turned on. When the waveform of the oscilloscope changes due to the instantaneous large current, the abnormal branch can be judged by comparing the power-on timing waveform with that of a good product.
[0036] Referring to Figure 2 , it can be understood that the power supply module 120 includes a first switch J1 and a first power supply terminal VCC. The first input terminal of the first switch J1 is connected to the first power supply terminal VCC. The second input terminal of the first switch J1 is used to connect to an external power supply 300. The output terminal of the first switch J1 is connected to the input terminal of the sensing module 110. The first switch J1 is used to select whether its output terminal is conducted with the first input terminal or select whether its output terminal is conducted with the second input terminal. Among them, the first input terminal of the first switch J1 corresponds to pin 1 in the figure, the second input terminal corresponds to pin 3 in the figure, and the output terminal corresponds to pin 2 in the figure. The first switch J1 can selectively conduct its output terminal with the first input terminal or the second input terminal, which means that the power supply module 120 can switch different power input modes according to actual needs. For example, when the external power supply 300 is available, it can be selected to connect to the external power supply 300 to provide electrical energy; when there is no external power supply 300, it can be switched to the first power supply terminal VCC, which may usually be an internal power supply or a backup power supply. In one embodiment, the product under test 200 is a Bluetooth headset body, and the external power supply 300 is a headset charging case. When the first switch J1 selects the output terminal to be conducted with the second input terminal, it is equivalent to directly charging the Bluetooth headset body with the headset charging case; when the first switch J1 selects the output terminal to be conducted with the first input terminal, it is equivalent to using the first power supply terminal VCC in the power management unit output detection circuit 100 to charge the Bluetooth headset body, which is used to simulate the process of charging the Bluetooth headset body by the headset charging case. By switching the state of the switch, the tester can easily change the power supply method without disassembling the machine, without complex adjustment or re-wiring of the circuit. This not only simplifies the detection process, but also reduces the operation difficulty and improves the work efficiency. In addition, this design helps to protect the product under test 200. During the detection process, if the external power supply 300 suddenly interrupts or is unstable, the first switch J1 can quickly switch to the first power supply terminal VCC to avoid damage to the product under test 200 due to power problems.
[0037] Referring to Figure 2, it can be understood that the sensing module 110 includes a sensing resistor R1. One end of the sensing resistor R1 is connected to the output end of the power supply module 120, and the other end of the sensing resistor R1 is used to be connected to the charging end of the product 200 to be detected. Two input ends of the signal amplification module 130 are respectively connected to both ends of the sensing resistor R1. Among them, the resistance value of the sensing resistor R1 is 0.1 ohm, and it is generally a 4-pin Sensor resistor. The sensing resistor R1, as a sensor device, can effectively sense the voltage or current change output by the power management unit. Since the resistance value of the sensing resistor R1 is precisely controllable, the voltage or current change at both ends thereof can directly reflect the output performance of the power management unit. By connecting both ends of the sensing resistor R1 to the signal amplification module 130, these signals can be further amplified, enabling the oscilloscope to capture and display waveform changes more clearly, thereby improving the detection accuracy and sensitivity.
[0038] It can be understood that the sensing module 110 further includes a debugging switch J2. Both ends of the debugging switch J2 are respectively connected to both ends of the sensing resistor R1. The debugging switch J2 allows the user to directly debug and test the sensing resistor R1 without disassembling the product to be detected. By operating the debugging switch J2, the user can conveniently observe the voltage or current change at both ends of the sensing resistor R1, thereby judging whether the output performance of the power management unit is normal and improving the work efficiency.
[0039] Referring to Figure 2 , it can be understood that the signal amplification module 130 includes an operational amplifier U1. The non-inverting input end of the operational amplifier U1 is connected to the input end of the sensing module 110, the inverting input end of the operational amplifier U1 is connected to the output end of the sensing module 110, and the output end of the operational amplifier U1 is connected to the detection terminal TP11. Among them, the model of the operational amplifier U1 can be selected as INA190, and this application does not limit this. The operational amplifier U1 usually has excellent linearity and stability, and can ensure that the amplified signal is not distorted or distorted. In addition, the operational amplifier U1 also has good anti-interference ability, and can resist a certain degree of noise interference and electromagnetic interference, ensuring the reliability of the detection result.
[0040] Continuing to refer to Figure 2, It can be understood that a differential filtering module 150 is further provided between the sensing module 110 and the signal amplification module 130. The differential filtering module 150 includes a second resistor R2, a third resistor R3, and a first capacitor C1. One end of the second resistor R2 is connected to the input end of the sensing module 110, one end of the third resistor R3 is connected to the output end of the sensing module 110, the two input ends of the signal amplification module 130 are respectively connected to the other ends of the second resistor R2 and the third resistor R3, and both ends of the first capacitor C1 are respectively connected to the other ends of the second resistor R2 and the third resistor R3. The differential filtering module 150 can effectively filter out the noise and interference signals from the sensing module 110, especially the common-mode noise, so as to ensure that the signal received by the signal amplification module 130 is clean and clear, and improve the overall stability of the circuit.
[0041] Continue to refer to Figure 2 , It can be understood that an output filtering module 160 is further provided between the signal amplification module 130 and the detection terminal TP11. The output filtering module 160 includes a fourth resistor R4 and a second capacitor C2. The output end of the signal amplification module 130 is connected to the detection terminal TP11 through the fourth resistor R4, and the fourth resistor R4 and the detection terminal TP11 are grounded through the second capacitor C2. The output filtering module 160 can filter out the high-frequency noise and ripple in the output signal of the signal amplification module 130 through the combination of the fourth resistor R4 and the second capacitor C2, thereby improving the purity and stability of the signal to ensure the accuracy of the detection result.
[0042] Continue to refer to Figure 2 , It can be understood that the power management unit output detection circuit 100 provided by this application further includes a grounding module 170. The grounding module 170 includes a fifth resistor R5 and a third switch J3. Both ends of the third switch J3 are respectively connected to both ends of the fifth resistor R5. One end of the fifth resistor R5 is used to be connected to the ground end of the product 200 to be detected, and the other end of the fifth resistor R5 is grounded.
[0043] In a second aspect, this application further provides a circuit board, including the power management unit output detection circuit 100 according to any one of the embodiments in the first aspect. The functions and principles of the circuit board in this embodiment are all based on the above-mentioned power management unit output detection circuit 100. Therefore, the circuit board in this embodiment has the same beneficial effects as the above-mentioned power management unit output detection circuit 100. For the sake of brevity, it will not be repeated here.
[0044] In a third aspect, this application further provides a detection device, including a circuit board as described in the second aspect.
[0045] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the gist of the present application within the scope of knowledge possessed by those of ordinary skill in the art to which the present application pertains.
Claims
1. A power management unit output detection circuit, characterized in that: include: A sensor module, wherein the output end of the sensor module is used to connect to the charging end of the product to be inspected; A power supply module, the output end of which is connected to the input end of the sensor module, for providing electrical energy to the product to be inspected; A signal amplification module, wherein two input terminals of the signal amplification module are respectively connected to the input terminal and the output terminal of the sensor module; A detection terminal is connected to the output end of the signal amplification module and is used to be connected to an oscilloscope to reflect the output performance of the power management unit in the product to be tested according to the waveform detected by the oscilloscope.
2. The power management unit output detection circuit according to claim 1, characterized in that: The power supply module includes a first switch and a first power supply end, the first input end of the first switch is connected to the first power supply end, the second input end of the first switch is used to connect to an external power supply, the output end of the first switch is connected to the input end of the sensor module, and the first switch is used to select its output end to be connected to the first input end, or to select its output end to be connected to the second input end.
3. The power management unit output detection circuit according to claim 1, characterized in that: The sensing module includes a sensing resistor, one end of which is connected to the output end of the power supply module, the other end of which is used to be connected to the charging end of the product to be inspected, and the two input ends of the signal amplification module are respectively connected to the two ends of the sensing resistor.
4. The power management unit output detection circuit according to claim 3, characterized in that: The sensor module further includes a debugging switch, and two ends of the debugging switch are respectively connected to two ends of the sensing resistor.
5. The power management unit output detection circuit according to claim 1, characterized in that: The signal amplification module comprises an operational amplifier, a non-inverting input terminal of the operational amplifier is connected to an input terminal of the sensor module, an inverting input terminal of the operational amplifier is connected to an output terminal of the sensor module, and an output terminal of the operational amplifier is connected to the detection terminal.
6. The power management unit output detection circuit according to claim 1, characterized in that: A differential filtering module is also provided between the sensing module and the signal amplifying module, and the differential filtering module includes a second resistor, a third resistor and a first capacitor, one end of the second resistor is connected to the input end of the sensing module, one end of the third resistor is connected to the output end of the sensing module, the two input ends of the signal amplifying module are respectively connected to the other ends of the second resistor and the third resistor, and the two ends of the first capacitor are respectively connected to the other ends of the second resistor and the third resistor.
7. The power management unit output detection circuit according to claim 1, characterized in that: An output filtering module is also provided between the signal amplifying module and the detection terminal. The output filtering module includes a fourth resistor and a second capacitor. The output end of the signal amplifying module is connected to the detection terminal via the fourth resistor, and the fourth resistor and the detection terminal are grounded via the second capacitor.
8. The power management unit output detection circuit according to claim 1, characterized in that: It also includes a grounding module, which includes a fifth resistor and a third switch, wherein two ends of the third switch are respectively connected to two ends of the fifth resistor, one end of the fifth resistor is used to be connected to the ground end of the product to be inspected, and the other end of the fifth resistor is grounded.
9. A circuit board, characterized in that: The invention comprises a power management unit output detection circuit as claimed in any one of claims 1 to 8.
10. A detection device, characterized in that: Comprising the circuit board as claimed in claim 9.