CN111157792A - High-reliability power supply impedance detection circuit system - Google Patents
High-reliability power supply impedance detection circuit system Download PDFInfo
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- CN111157792A CN111157792A CN202010013937.8A CN202010013937A CN111157792A CN 111157792 A CN111157792 A CN 111157792A CN 202010013937 A CN202010013937 A CN 202010013937A CN 111157792 A CN111157792 A CN 111157792A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The invention belongs to the technical field of board card fault detection, and particularly relates to a high-reliability power supply impedance detection circuit system which comprises a constant current source, an isolation network, a selection network and a microcontroller, wherein the constant current source is used for providing reference current, the reference current passes through the isolation network to the selection network, the microcontroller controls the selection network to output the reference current to each detected power supply detection end, and the microcontroller is also used for acquiring load voltage of each detected power supply detection end to calculate impedance. The high-reliability power supply impedance detection circuit system is low in cost, small in size and high in reliability, and can be used as a means for assisting in judging the state of the board card at any stage of the board card.
Description
Technical Field
The invention belongs to the technical field of board card fault detection, and particularly relates to a high-reliability power supply impedance detection circuit system.
Background
In many complex function board cards, there are many power modules, and because the board cards have unknown faults in the processes of welding, packaging, transportation and long-term use, each detection needs manual detection, or a test tool is manufactured, the prior art such as patent document with publication number CN107024915B discloses a fault detection system and a detection method for a board card of a power grid controller, which includes a data acquisition module, a storage module, a data training module, a fault detection control module and an upper computer, wherein the input end of the data acquisition module is connected with the board card of the power grid controller, the output end of the data acquisition module is connected with the storage module and the fault detection control module, and the data training module and the fault detection control module are both connected with the storage module; the data acquisition module transmits acquired power grid controller board card data to the storage module, the data training module conducts data training through the data in the storage module to establish a training model and stores the training model into the storage module, and the fault detection control module receives the acquired data of the data acquisition module in real time, compares the training model in the storage module to automatically diagnose fault points and fault types of the controller board card and transmits the fault points and fault types to the upper computer. The technical scheme is complex in design, and for small-sized board cards, especially board cards with power modules, the detection process of the attached large size is complex, and the requirements of low cost and rapid fault positioning cannot be met.
In view of the above-mentioned deficiencies of the prior art, improvements are needed.
Disclosure of Invention
Based on the above-mentioned shortcomings in the prior art, the present invention provides a high-reliability power impedance detection circuit system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a high reliability power impedance detection circuitry, power impedance detection circuitry includes constant current source, isolation network, selection network and microcontroller, the constant current source is used for providing reference current, reference current is through isolation network to selection network, microcontroller control selection network exports reference current to each way by survey power supply detection end, microcontroller still is used for gathering the load voltage of each way by survey power supply detection end with the impedance of calculation.
Preferably, an impedance limiting network is further arranged between the selection network and the detection ends of the detected power supplies of the circuits, and the impedance limiting network is used for limiting the load voltage of the detection ends of the detected power supplies of the circuits so that the load voltage of the detection ends of the detected power supplies of the circuits is smaller than the load working voltage of the detection ends of the detected power supplies of the circuits.
Preferably, the constant current source is composed of a reference voltage chip, a resistor, a capacitor and a triode.
Preferably, the isolation network is formed by one or more elements of a relay and a load switch.
Preferably, the impedance limiting network is formed by one or more elements of a diode and a resistor.
Preferably, the selection network further comprises a circuit breaking element for disconnecting the power supply impedance detection circuit system from the detected power supply terminals under the non-operation condition, and the circuit breaking element comprises one or more of a relay and a load switch.
As a preferred scheme, the microcontroller comprises a control chip, an acquisition unit, an analog-to-digital converter and a calculation unit, wherein the control chip controls the selection network to output the reference current to the detection ends of the detected power supplies of all circuits, the acquisition unit acquires the load voltage of the detection ends of the detected power supplies of all circuits, the analog-to-digital converter performs analog-to-digital conversion on the acquired load voltage signals, and the calculation unit calculates the converted digital signals and outputs the impedance of the detection ends of the detected power supplies of all circuits.
Preferably, the impedance limiting network is formed by one or more elements of a diode and a resistor.
As a preferred scheme, the detected ends of the detected power supplies comprise a detected power supply end and load ends.
Compared with the prior art, the invention has the beneficial effects that
1. The high-reliability power supply impedance detection circuit system is small in size and high in reliability, and can be used for quickly positioning a fault network;
2. the high-reliability power supply impedance detection circuit system has few elements, low cost and low power consumption;
3. the high-reliability power supply impedance detection circuit system does not cause board card failure under the condition of fault, and does not influence the original functions of the board card;
4. the high-reliability power supply impedance detection circuit system can reduce the manual detection and maintenance cost and reduce the production cost;
5. the high-reliability power supply impedance detection circuit system has voltage overrun protection and cannot cause damage to board card elements.
Drawings
FIG. 1 is a flow chart of power impedance detection circuitry according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a constant current source circuit according to a first embodiment of the high reliability power impedance detection circuitry of the present invention;
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The first embodiment is as follows:
as shown in fig. 1-2, the power impedance detection circuit system of this embodiment includes a constant current source, an isolation network, a selection network, an impedance limiting network, and a microcontroller, and is configured to detect impedance of each detected power detection end during a board card power-on process, and assist in locating an impedance abnormality network, where each detected power detection end includes a source end and a load end, and before the board card is powered on, it can be found whether the power network on the board card has a short circuit, an impedance abnormality, and the like, so as to quickly locate a fault board card fault network, save troubleshooting time, and prevent a secondary damage to the board card.
Specifically, a reference current provided by the constant current source passes through the isolation network to the selection network, and the selection network outputs the reference current to the impedance limiting network and the power supply to be detected; the microcontroller can control the selection network and can detect the impedance of the multi-path power supply; the microcontroller collects the impedance information of the power supply to be detected and judges whether the impedance is in a required range;
the impedance limiting network limits the rising voltage to a safe range, ensures that a load chip cannot be burnt, ensures that the load voltage is smaller than the load working voltage when the impedance of the detected power supply is overlarge, and the load voltage can be close to VCC.
The constant current source can be a simplest single constant current diode, or a simple constant current source circuit is composed of a reference voltage chip, a resistor, a capacitor and a triode, the specific structure of the constant current source is not limited, a single path of the existing constant current source is much and is not repeated, one simple circuit is shown in figure 2, U1 is the reference voltage chip, R2 is a current limiting resistor, the output current can be adjusted by adjusting the resistance value of R2, and the output current is approximately equal to 2. U1 reference voltage/R2 resistance value;
in order to prevent the constant current source current from flowing into the rear stage under the non-working condition caused by other faults, an isolation network is introduced, and the isolation network can be formed by one or more of elements which can be conducted and closed, such as a relay or a load switch;
the introduction of a selection network is to save cost, the selection network realizes the introduction of the output current of the constant current source to a tested load end and can be composed of a simple change-over switch or a complex data selector, and the selection network is also provided with a circuit breaking device which is matched with a microcontroller to control the disconnection of the load end under the non-working condition of a detection circuit, and the circuit breaking device is composed of one or more of elements which can be conducted and closed, such as a relay or a load switch;
the microcontroller comprises a control chip, an acquisition unit, an analog-to-digital converter and a calculation unit, wherein the control chip controls the selection network to output reference current to each detected power supply detection end, the acquisition unit acquires load voltage of each detected power supply detection end, namely each detected power supply detection end output by the selection network is selected, the analog-to-digital converter has an A/D function and performs analog-to-digital conversion on acquired load voltage signals, the calculation unit calculates converted digital signals and outputs impedance of each detected power supply detection end, and when the detection circuit works, the load voltage is acquired from the load end, an impedance value is calculated, and the load power supply state is judged.
The high-reliability power supply impedance detection circuit system of the embodiment focuses on impedance detection of a power supply to be detected, has few elements, low cost, small power consumption, small size and high reliability, and can quickly locate a fault network, for example, when the power supply to be detected fails, the power supply impedance detection circuit system carries out impedance test on an alternating current end behind a test power supply protective tube, four rectifier diodes of the power supply, and a direct current resistor of the test power supply through a selection network; at the AC end behind the power supply fuse, the normal resistance is more than tens of kilo ohms, and if the resistance is zero, the AC short circuit phenomenon exists in the power supply; the forward resistance of four rectifier diodes of the power supply is several k stages, the reverse resistance is close to infinity, and if the detection is abnormal, the four rectifier diodes of the power supply are in failure; testing the direct current resistance of the power supply, wherein the normal resistance is also in the order of several k, and if the resistance is zero, the direct current short circuit fault exists; other load end detection such as detection of an alternating current filter capacitor, a voltage dependent resistor, a voltage reduction resistor and the like of the power supply can also quickly reflect fault points and fault types of the power supply; the isolation network and the selection network are benefited, the board card cannot be failed under the condition that the power supply impedance detection circuit system fails, the original function of the board card is not influenced, the manual detection and maintenance cost can be reduced, and the production cost is reduced; the impedance limiting network has voltage overrun protection, and board card elements cannot be damaged.
The high-reliability power supply impedance detection circuit system is low in cost, small in size and high in reliability, and can be used as a means for assisting in judging the state of the board card at any stage of the board card.
It should be noted that the above-mentioned only illustrates the preferred embodiments and principles of the present invention, and that those skilled in the art will be able to make modifications to the embodiments based on the idea of the present invention, and that such modifications should be considered as the protection scope of the present invention.
Claims (9)
1. The utility model provides a high reliability power impedance detection circuitry, its characterized in that, power impedance detection circuitry includes constant current source, isolation network, selection network and microcontroller, the constant current source is used for providing reference current, reference current passes through isolation network to selection network, microcontroller control selection network exports reference current to each circuit by survey power supply detection end, microcontroller still is used for gathering the load voltage of each way by survey power supply detection end with the impedance of calculation.
2. The system according to claim 1, wherein an impedance limiting network is further disposed between the selection network and the detection terminals of each of the detected power supplies, and the impedance limiting network is configured to limit the load voltage of the detection terminals of each of the detected power supplies, so that the load voltage of the detection terminals of each of the detected power supplies is smaller than the load working voltage thereof.
3. The system of claim 1, wherein said constant current source is composed of a reference voltage chip, a resistor, a capacitor, and a transistor.
4. The system of claim 1, wherein the isolation network is formed by one or more components selected from a relay and a load switch.
5. The system of claim 1, wherein the impedance limiting network is formed by one or more of a diode and a resistor.
6. The system of claim 1, wherein the selection network further comprises a circuit breaking element for disconnecting the power supply impedance detection circuit from the power supply impedance detection terminals under non-operation condition, the circuit breaking element comprising one or more of a relay and a load switch.
7. The system according to claim 1, wherein the microcontroller comprises a control chip, an acquisition unit, an analog-to-digital converter, and a calculation unit, the control chip controls the selection network to output the reference current to the detection terminals of each of the detected power supplies, the acquisition unit acquires the load voltage of the detection terminals of each of the detected power supplies, the analog-to-digital converter performs analog-to-digital conversion on the acquired load voltage signal, and the calculation unit calculates the converted digital signal and outputs the impedance of the detection terminals of each of the detected power supplies.
8. The system of claim 2, wherein the impedance limiting network is formed by one or more of a diode and a resistor.
9. The system of claim 1, wherein the power source impedance detection terminals of each circuit include a power source terminal to be detected and a load terminal to be detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010013937.8A CN111157792A (en) | 2020-01-07 | 2020-01-07 | High-reliability power supply impedance detection circuit system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010013937.8A CN111157792A (en) | 2020-01-07 | 2020-01-07 | High-reliability power supply impedance detection circuit system |
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| CN111157792A true CN111157792A (en) | 2020-05-15 |
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| JPH09281202A (en) * | 1996-02-16 | 1997-10-31 | Hioki Ee Corp | Battery measuring instrument |
| JP2003121514A (en) * | 2001-10-09 | 2003-04-23 | Furukawa Battery Co Ltd:The | Internal impedance measuring method for storage battery |
| CN1975444A (en) * | 2005-11-28 | 2007-06-06 | 孙斌 | Accumulator cell internal resistance and degradation state on-line monitoring method and system |
| CN103134988A (en) * | 2013-01-31 | 2013-06-05 | 中国科学院上海技术物理研究所 | Multichannel value of resistance automation measuring system |
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| CN104360165A (en) * | 2014-11-26 | 2015-02-18 | 上海斐讯数据通信技术有限公司 | Multichannel resistance measuring device |
| CN205157745U (en) * | 2015-11-23 | 2016-04-13 | 江苏富威能源有限公司 | Hold internal resistance of cell detecting system based on ARM7 |
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2020
- 2020-01-07 CN CN202010013937.8A patent/CN111157792A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09281202A (en) * | 1996-02-16 | 1997-10-31 | Hioki Ee Corp | Battery measuring instrument |
| JP2003121514A (en) * | 2001-10-09 | 2003-04-23 | Furukawa Battery Co Ltd:The | Internal impedance measuring method for storage battery |
| CN1975444A (en) * | 2005-11-28 | 2007-06-06 | 孙斌 | Accumulator cell internal resistance and degradation state on-line monitoring method and system |
| CN103134988A (en) * | 2013-01-31 | 2013-06-05 | 中国科学院上海技术物理研究所 | Multichannel value of resistance automation measuring system |
| CN103869193A (en) * | 2014-03-20 | 2014-06-18 | 北京航天控制仪器研究所 | Reliability detecting method for multi-channel power transmission device |
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Application publication date: 20200515 |
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