CN113655400A - Power supply testing method and tool - Google Patents
Power supply testing method and tool Download PDFInfo
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- CN113655400A CN113655400A CN202111126719.6A CN202111126719A CN113655400A CN 113655400 A CN113655400 A CN 113655400A CN 202111126719 A CN202111126719 A CN 202111126719A CN 113655400 A CN113655400 A CN 113655400A
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Abstract
The embodiment of the invention provides a power supply testing method and a power supply testing tool. The method comprises the following steps: the control unit determines a test mode of the power supply test according to the detected pressing duration of the first key; the control unit determines a voltage signal output in the test mode according to the detected pressing state of the second key or the third key; the driving unit provides a load current which accords with a test mode for the test object according to the received voltage signal. Through the adjustment of the pressing duration of the first key, the switching of the power supply test in different test modes is realized, and the performance test of a test object in various test environments is realized. Meanwhile, under a specific certain test mode, the control unit can detect the pressing state of the second key or the third key to realize the adjustment of the voltage signal, and further optimize the design of power supply test. The test method is simple, and the performance of the test object in the test environment can be more accurately detected through switching of various test modes.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuits, in particular to a power supply testing method and a power supply testing tool.
Background
With the development of electronic technology, functional standards of electronic devices are becoming higher and higher, and when designing and developing electronic devices, various tests are performed on the electronic devices, and a test on a power supply portion of the electronic devices is also an important part. When a power supply part of electronic equipment is tested, what load is connected to the power supply becomes a problem, and the power supply cannot be evaluated without the load. Therefore, in order to automatically perform a power test, an electronic load is often used as a power test tool.
The power supply testing tool is connected with the power supply, and the power supply testing tool can control the voltage, the current or the resistance output by the power supply through adjusting the circuit of the power supply testing tool, so that the performance of the power supply under different states can be tested. However, the existing power supply testing tool is complex in structure and single in testing mode, and the power supply testing tool cannot simply and conveniently adjust the output of the testing mode, so that troubles are brought to testers.
In summary, embodiments of the present invention provide a power testing method for providing multiple testing modes and improving convenience and accuracy of testing operations in different testing modes.
Disclosure of Invention
The embodiment of the invention provides a power supply testing method which is used for providing a plurality of testing modes and improving the convenience and accuracy of testing operation under different testing modes.
In a first aspect, an embodiment of the present invention provides a power supply testing method, including:
the control unit determines a test mode of the power supply test according to the detected pressing duration of the first key; the test mode is any one of a static load pulling mode, a dynamic load pulling mode and a load pulling slope adjusting mode; the static load-pulling mode is used for providing constant load-pulling current for a test object; the dynamic pull-load mode is used for providing variable pull-load current for the test object; the load-pulling slope adjusting mode is used for providing load-pulling current with constant load-pulling slope for the test object;
the control unit determines a voltage signal output in the test mode according to the detected pressing state of the second key or the third key;
and the driving unit provides a pull-load current which accords with the test mode for the test object according to the received voltage signal.
The power supply test switching method has the advantages that the switching of the power supply test in different test modes is realized through the adjustment of the pressing duration of the first key, multiple test modes are set, the constant load current, the variable load current and the constant load current with the load slope are respectively provided for a test object, the performance test of the test object under multiple test environments is realized, the operation is convenient and simple, and the mode switching is easy to operate. Meanwhile, the second key and the third key are arranged, so that the voltage signal can be adjusted by detecting the pressing state of the second key or the third key through the control unit in a specific certain test mode, and the design of power supply test is further optimized. Then, after the voltage signal is received by the driving unit, the pull-load current conforming to the test mode can be provided for the test object according to the indication of the voltage signal. The test method is simple, and the performance of the test object in the test environment can be more accurately detected through switching of various test modes.
Optionally, the determining, by the control unit, a test mode of the power test according to the detected pressing duration of the first key includes:
when the control unit confirms that the pressing duration of the first key is less than a first time period, the test mode is adjusted to be a static pull-load mode;
when the control unit confirms that the pressing duration of the first key is not less than the first time interval and not more than the second time interval, the test mode is adjusted to be a dynamic pull-loading mode;
and when the control unit confirms that the pressing duration of the first key is greater than the second time interval, the test mode is adjusted to a load pulling slope adjusting mode.
Optionally, the test mode is a static pull load mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
and the control unit correspondingly adjusts the output value of the voltage signal up or down according to the detected pressing times of the second key or the third key.
Optionally, the test mode is a dynamic load pulling mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
when the control unit detects that the pressing duration of a fourth key is less than a fourth time period, the dynamic load pulling mode is adjusted to be a dynamic load pulling low-value mode;
when the control unit detects that the pressing duration of a fourth key is not less than the fourth time period, the dynamic load pulling mode is adjusted to be a dynamic load pulling high value mode;
and in the dynamic load pulling low value mode or the dynamic load pulling high value mode, the control unit correspondingly adjusts the minimum value or the maximum value of the voltage signal output up or down according to the detected pressing times of the second key or the third key.
Optionally, the test mode is a pull-load slope adjustment mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
and the control unit correspondingly adjusts the rising time of the voltage signal from the minimum value to the maximum value up or down according to the detected pressing times of the second key or the third key.
In a second aspect, an embodiment of the present invention further provides a power supply testing tool, including:
the key unit comprises keys electrically connected with the control unit;
the control unit is used for determining a test mode of the power supply test according to the detected pressing duration of the first key; the test mode is any one of a static load pulling mode, a dynamic load pulling mode and a load pulling slope adjusting mode; the static load-pulling mode is used for providing constant load-pulling current for a test object; the dynamic pull-load mode is used for providing variable pull-load current for the test object; the load-pulling slope adjusting mode is used for providing load-pulling current with constant load-pulling slope for the test object; the test module is also used for determining a voltage signal output to the driving unit in the test mode according to the detected pressing state of the second key or the third key;
and the driving unit is used for providing the load current which accords with the test mode for the test object according to the received voltage signal.
Optionally, the driving unit includes an operational amplifier, a fifth resistor, a first power tube, and a sampling resistor;
the first power tube is connected with the sampling resistor in series; the operational amplifier is connected with the fifth resistor in series;
the same-direction input end of the operational amplifier is used for receiving the voltage signal; the inverting input end of the operational amplifier is connected with the sampling resistor;
the first power tube is configured to control a conduction state of the first power tube according to a signal difference between a first end of the first power tube and a third end of the first power tube, where the first end is connected to an output end of the operational amplifier, a second end of the first power tube is connected to the test object, and the third end is connected to the sampling resistor.
Optionally, the method further comprises: a current detector;
the current detector comprises a first voltage comparator, a second power tube, a third power tube and a first indicator light;
the first input end of the first voltage comparator is used for collecting the voltage of the sampling resistor; the second input end of the first voltage comparator is used for collecting a first reference voltage;
the first voltage comparator is used for outputting a first signal when the voltage of the sampling resistor is higher than the first reference voltage; the first signal is used for controlling the second power tube to be conducted so as to light the first indicator lamp, and controlling the third power tube to be conducted so as to enable the output end of the operational amplifier to be grounded.
Optionally, the method further comprises: a temperature detector;
the temperature detector comprises a thermistor, a second voltage comparator, a fourth power tube, a fifth power tube and a second indicator light;
the first input end of the second voltage comparator is used for collecting the voltage of the thermistor; the second input end of the second voltage comparator is used for collecting a second reference voltage; the thermistor is arranged adjacent to the first power tube;
the second voltage comparator is used for outputting a second signal when the voltage of the thermistor is higher than the second reference voltage; the second signal is used for controlling the fourth power tube to be conducted so as to light the second indicator light, and controlling the fifth power tube to be conducted so as to enable the output end of the operational amplifier to be grounded.
Optionally, the method further comprises: an overvoltage detector;
the overvoltage detector comprises a third voltage comparator, a sixth power tube and a third indicator light;
the first input end of the third voltage comparator is used for collecting the voltage output to the test object; the second input end of the third voltage comparator is used for collecting a third reference voltage;
the third voltage comparator is used for outputting a third signal when the voltage output to the test object is higher than the third reference voltage; the third signal is used for controlling the sixth power tube to be conducted, so that the third indicator lamp is lightened.
The power supply test switching method has the advantages that the switching of the power supply test in different test modes is realized through the adjustment of the pressing duration of the first key, multiple test modes are set, the constant load current, the variable load current and the constant load current with the load slope are respectively provided for a test object, the performance test of the test object under multiple test environments is realized, the operation is convenient and simple, and the mode switching is easy to operate. Meanwhile, the second key and the third key are arranged, so that the voltage signal can be adjusted by detecting the pressing state of the second key or the third key through the control unit in a specific certain test mode, and the design of power supply test is further optimized. Then, after the voltage signal is received by the driving unit, the pull-load current conforming to the test mode can be provided for the test object according to the indication of the voltage signal. The test method is simple, and the performance of the test object in the test environment can be more accurately detected through switching of various test modes.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a usage scenario of a power testing tool according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a power testing tool according to an embodiment of the present invention;
FIG. 3A is a circuit diagram of a possible key unit according to an embodiment of the present invention;
FIG. 3B is a schematic diagram of a possible power testing method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a possible varying pull-up current displayed on an oscilloscope according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an adjustment manner of the control unit by the key unit according to an embodiment of the present invention;
fig. 6 is a circuit structure diagram of a possible driving unit according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a power testing tool according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a current detector according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a power testing tool according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a temperature detector according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a power testing tool according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an overvoltage detector according to an embodiment of the present invention.
Detailed Description
To make the objects, embodiments and advantages of the present application clearer, the following description of exemplary embodiments of the present application will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application, and it is to be understood that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments described herein without inventive step, are intended to be within the scope of the claims appended hereto. In addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.
It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and are not necessarily intended to limit the order or sequence of any particular one, Unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
Fig. 1 schematically shows a usage scenario of a power testing tool provided by an embodiment of the invention. Including a power supply test tool 100 and a test object 200. The test object 200 may be a power source for various electronic devices. The power supply test tool 100 is connected to an output terminal of the test object 200 and simulates the performance of a load connected to the test object 200 to efficiently perform a power supply performance test.
The power supply test tool 100 can control the voltage, current or resistance provided to the test object 200 through the adjustment of its own circuit. The power supply test tool 100 provided in the embodiment of the present invention mainly refers to a power supply test tool capable of controlling a current supplied to a test object.
The structure of the power supply test tool 100 will be described next.
Fig. 2 is a schematic structural diagram illustrating a power supply testing tool according to an embodiment of the present invention. Including a power supply unit 101, a key unit 102, a control unit 103, a drive unit 104, and a load interface 105.
The power supply unit 101 is used to supply power to the entire power supply test tool, and the specific power supply voltage is not limited in the embodiment of the present invention, and may be, for example, 3.3V. If the input voltage range of the power supply unit 101 is too large, the Buck DC-DC voltage reduction circuit can reduce the voltage to obtain a voltage of 3.3V and then supply power to the whole power supply testing tool.
The key unit 102 is connected to the control unit 103, includes keys electrically connected to the control unit 103, and can regulate and control the adjustment of the test mode and the voltage signal inside the control unit 103 through key operation. The test mode comprises any one of a static load pulling mode, a dynamic load pulling mode and a load pulling slope adjusting mode; the static load-pulling mode is used for providing constant load-pulling current for the test object; the dynamic load-pulling mode is used for providing variable load-pulling current for the test object; the load-pulling slope adjusting mode is used for providing load-pulling current with constant load-pulling slope for the test object.
The control unit 103 is configured to switch the test modes under the control of the key unit 102, and output a corresponding voltage signal under any test mode according to the control of the key unit 102.
And the driving unit 104 is connected with the control unit 103 and used for providing the pull-load current which accords with the test mode for the test object according to the received voltage signal output by the control unit 103.
And a load interface 105 connected to the driving unit 104 and the test object, and supplying the pull-load current output from the driving unit 104 to the test object.
One possible circuit diagram of the key unit 102 is shown in FIG. 3A, and includes a first key 1021, a second key 1022, a third key 1023, and a fourth key 1024.
One possible power supply test method is shown in FIG. 3B, which includes:
When the first button 1021 is pressed, the voltage at the port d of the control unit 103 is grounded, and when the control unit 103 detects that the voltage at the port d changes from the voltage VCC to 0, the test mode of the power supply test can be determined according to the duration of the voltage at the port d being 0.
Specifically, when the control unit 103 determines that the pressing duration of the first key 1021 is less than a first time period, the test mode is adjusted to be the static pull-load mode;
when the control unit 103 confirms that the pressing duration of the first key 1021 is not less than the first time interval and not more than the second time interval, the test mode is adjusted to a dynamic pull-load mode;
when the control unit 103 determines that the pressing duration of the first key 1021 is longer than the second time period, the test mode is adjusted to a pull-loading slope adjustment mode.
For example, when the pressing duration of the first key 1021 is less than 3s, the test mode of the power test is adjusted to a static pull-load mode; when the pressing duration of the first key 1021 is 3 s-6 s, the test mode of the power supply test is adjusted to be a dynamic load-pulling mode; when the pressing duration of the first key 1021 is longer than 6s, the test mode of the power test is adjusted to be the load pulling slope adjusting mode.
Similarly, when the second key 1022, the third key 1023 or the fourth key 1024 is pressed, the control unit 103 can detect that the voltage at port c, b or a is set to 0, respectively. The voltage output of the control unit 103 can be controlled by controlling the pressed state of the second key 1022, the third key 1023 or the fourth key 1024.
Specifically, when the test mode is the static pull-load mode, the control unit 103 may correspondingly adjust the output value of the voltage signal up or down according to the detected number of times that the second key 1022 or the third key 1023 is pressed.
When the test mode is a dynamic load pulling mode; when detecting that the pressing duration of the fourth key 1024 is less than the fourth time period, the control unit 103 adjusts the dynamic load pull mode to a dynamic load pull low value mode; when detecting that the pressing duration of the fourth key 1024 is not less than the fourth time period, the control unit 103 adjusts the dynamic load pull mode to a dynamic load pull high value mode; in the dynamic pull-load low value mode or the dynamic pull-load high value mode, the control unit 103 correspondingly adjusts the minimum value or the maximum value of the voltage signal output according to the detected number of times of pressing the second key 1022 or the third key 1023.
When the test mode is a pull load slope adjusting mode; the control unit 103 is configured to adjust the rising time of the voltage signal from the minimum value to the maximum value according to the detected number of times that the second key 1022 or the third key 1023 is pressed.
For convenience of understanding, the adjustment manner of the key unit 102 to the control unit 103 is described below with reference to fig. 5 in a specific embodiment.
Example one
When the pressing duration of the first key 1021 is shorter than 3s, the control unit 103 adjusts the test mode to the static pull-load mode accordingly. In the static pull-load mode, the control unit 103 may output a constant voltage signal, so that the driving unit 104 may output a constant pull-load current for the test object according to the constant voltage signal. In the driving unit 104, an oscilloscope or an ammeter may be provided for displaying the magnitude of the pull-up current output by the driving unit 104.
A user checks the magnitude of the currently displayed pull-load current on the oscilloscope, and if the current displayed pull-load current is smaller than the required pull-load current, the second key 1022 can be pressed, and the value of the voltage signal output by the control unit 103 is adjusted upwards, so that the magnitude of the pull-load current displayed on the oscilloscope is adjusted upwards, and the magnitude of the pull-load current displayed on the oscilloscope is adjusted upwards for multiple times by pressing the second key 1022; if the currently displayed load current is larger than the required load current, the third button 1023 can be pressed to adjust the value of the voltage signal output by the control unit 103 downwards, so that the load current displayed on the oscilloscope is adjusted downwards, and the load current displayed on the oscilloscope can be adjusted downwards for multiple times by pressing the third button 1023 for multiple times.
Example two
When the pressing time of the first key 1021 is 3 s-6 s, the control unit 103 adjusts the test mode to the dynamic pull-loading mode accordingly. In the dynamic pull-load mode, the control unit 103 may output a varying voltage signal, so that the driving unit 104 may output a varying pull-load current for the test object according to the varying voltage signal.
The varying pull-up current profile may be a rectangular, trapezoidal or parabolic pull-up current. A schematic of a possible varying pull-up current displayed on an oscilloscope is shown in fig. 4, where the variation of the pull-up current is plotted as a trapezoid in fig. 4.
The user views the current displayed image of the pull-up current on the oscilloscope and can adjust the lowest value and the highest value of the changed pull-up current.
When the control unit 103 detects that the pressing duration of the fourth key 1024 is less than 3 seconds, the fourth key 1024 is further adjusted to be in the dynamic load pulling mode, and the second key 1022 and the third key 1023 are pressed to adjust the lowest value of the load pulling current. Until the minimum value of the pull-up current in the required dynamic pull-up mode is adjusted.
Similarly, when the control unit 103 detects that the pressing duration of the fourth button 1024 is longer than 3 seconds, in the dynamic load-pulling mode, the dynamic load-pulling mode is further adjusted to be the dynamic load-pulling high-value mode, and in the dynamic load-pulling high-value mode, the user presses the second button 1022 to adjust the maximum value of the load-pulling current upward, and presses the third button 1023 to adjust the maximum value of the load-pulling current downward. Until the maximum value of the pull-load current in the required dynamic pull-load mode is adjusted.
EXAMPLE III
When the pressing time period of the first key 1021 is longer than 6s, the control unit 103 adjusts the test mode to the pull-load slope adjustment mode accordingly. In the pull-load slope adjustment mode, the control unit 103 may output a voltage signal with a constant pull-load slope, so that the driving unit 104 may output a pull-load current with a constant pull-load slope for the test object according to the voltage signal with a constant pull-load slope.
Also in the example of fig. 4, the lowest value and the highest value of the pull-up current are set in the second embodiment. However, in the third embodiment, the slope of the pull-up current pattern is set as required. Specifically, the adjustment is performed by setting the rise time for the pull-up current to rise from the lowest value to the highest value.
The user views the image of the currently displayed pull-up current on the oscilloscope and can adjust the rise time of the changed pull-up current from the lowest value to the highest value.
If the slope of the currently displayed pull-load current is larger, the second key 1022 may be pressed, and the rise time of the voltage signal output by the upper control unit 103 from the minimum value to the maximum value is increased, so as to increase the rise time of the pull-load current displayed on the oscilloscope from the minimum value to the maximum value, and press the second key 1022 multiple times, that is, increase the rise time of the pull-load current displayed on the oscilloscope from the minimum value to the maximum value multiple times; if the slope of the currently displayed pull-load current is slightly smaller, the third button 1023 can be pressed, the rise time of the voltage signal output by the down-regulation control unit 103 from the minimum value to the maximum value is reduced, so that the rise time of the pull-load current displayed on the oscilloscope from the minimum value to the maximum value is reduced, and the rise time of the pull-load current displayed on the oscilloscope from the minimum value to the maximum value can be reduced by pressing the third button 1023 for multiple times.
Through the adjustment of the pressing duration of the first key 1021, the switching of a power supply test in different test modes is realized, and multiple test modes are set for providing constant load current, variable load current and constant load current with constant load slope for a test object respectively, so that the performance test of the test object in multiple test environments is realized, the operation is convenient and simple, and the mode switching is easy to operate. Meanwhile, the second button 1022 and the third button 1023 are arranged, so that the voltage signal can be adjusted by detecting the pressing state of the second button 1022 or the third button 1023 through the control unit 103 in a specific certain test mode, and the design of power supply test is further optimized. Then, after the voltage signal is received by the driving unit 104, the pull-up current according to the test mode can be provided to the test object according to the indication of the voltage signal. The test method is simple, and the performance of the test object in the test environment can be more accurately detected through switching of various test modes.
Fig. 6 illustrates a circuit structure diagram of a possible driving unit 104 according to an embodiment of the present invention.
The driving unit 104 comprises an operational amplifier U2, a fifth resistor R5, a first power tube Q1 and a sampling resistor Rcs;
the first power tube Q1 is connected with the sampling resistor Rcs in series; the operational amplifier U2 is connected with the fifth resistor R5 in series;
the same-direction input end of the operational amplifier U2 is used for receiving a voltage signal; the reverse input end of the operational amplifier U2 is connected with the sampling resistor Rcs;
and the first power tube Q1 is configured to control a conducting state of the first power tube Q1 according to a signal difference between a first end of the first power tube Q1 and a third end of the first power tube Q1, where the first end is connected to an output end of the operational amplifier U2, the second end of the first power tube Q1 is connected to a test object, and the third end is connected to the sampling resistor Rcs.
When the same-direction input end of the operational amplifier U2 receives the voltage signal input by the control unit 103, the output end outputs an amplified voltage signal, the amplified voltage signal is connected to the first end of the first power tube Q1, and when the voltage signal at the first end of the first power tube Q1 is greater than the voltage signal at the third end, the first power tube Q1 is turned on, and the voltage signal at the upper end of Rcs is the same as the voltage signal input by the non-phase input end of the operational amplifier U2, so that the change of the current flowing through the two ends of Rcs is the same as the change of the voltage signal input by the non-phase input end of the operational amplifier U2. The current flowing across Rcs is the pull-load current provided by the driving unit 104 to the test object through the load interface 105.
Therefore, it can be said that the control unit 103 supplies a pull-load current to the test object through the output voltage signal and Rcs. When the voltage signal output by the control unit 103 is a constant voltage signal in the static pull-load mode, the pull-load current provided by the driving unit 104 to the test object is also a constant value; when the voltage signal output by the control unit 103 is a varying voltage signal in the dynamic pull-load mode, the pull-load current provided by the driving unit 104 to the test object is also a constant variation value; when the voltage signal output by the control unit 103 is a voltage signal with a constant pull-up slope in the pull-up slope adjustment mode, the pull-up current provided by the driving unit 104 to the test object is also a current value with a constant pull-up slope.
Optionally, as shown in fig. 7, a current detector 106 may be further provided in the power test tool for detecting whether the current flowing through Rcs exceeds a rated value. If the rated value is exceeded, Rcs and the first power tube Q1 are easily burned out.
The internal structure of the current detector 106 is not limited by the embodiments of the present invention. Fig. 8 shows a schematic structural diagram of a current detector 106 according to an embodiment of the present invention.
The current detector 106 includes a first voltage comparator U3, a second power tube Q2, a third power tube Q3, and a first indicator LED 1;
a first input end of the first voltage comparator U3, configured to collect a voltage of the sampling resistor Rcs; a second input terminal of the first voltage comparator U3, configured to collect a first reference voltage;
a first voltage comparator U3 for outputting a first signal when the voltage of the sampling resistor Rcs is higher than a first reference voltage; the first signal is used to control the second power transistor Q2 to be turned on, so as to light the first indicator light LED1, and control the third power transistor Q3 to be turned on, so that the output terminal of the operational amplifier U2 is grounded.
The second input terminal of the first voltage comparator U3 is connected to a first reference voltage, which may be set directly or may be a sliding resistor R7 as shown in fig. 8, and the first reference voltage is adjusted by the connection resistance of the power VCC and the sliding resistor R7. When the voltage value at the sampling resistor Rcs in the driving unit 104 is higher than the first reference voltage, the first voltage comparator U3 is turned on, outputting a first signal, and the first signal turns on the second power transistor Q2 and the third power transistor Q3. When the second power tube Q2 is turned on, the first indicator light LED1 has current flowing through it, so the first indicator light LED1 lights up to remind the user that the voltage value at the sampling resistor Rcs exceeds the rated voltage, and the sampling resistor Rcs is at risk of burning out. When the third power transistor Q3 is turned on, since the upper end of the third power transistor Q3 is connected to the first end of the first power transistor Q1, the upper end of the third power transistor Q3 is grounded, i.e., the first end of the first power transistor Q1 is grounded, and the voltage is set to zero. Then the voltage signal at the first terminal of the first power transistor Q1 in the driving unit 104 is set to zero, the voltage at the first terminal of the first power transistor Q1 is less than the voltage at the third terminal, the first power transistor Q1 is turned off, and the driving unit 104 stops providing the pull-load current for the test object. In this way, after the voltage signal at the sampling resistor Rcs exceeds the rated voltage, the sampling resistor Rcs and the first power tube Q1 can be effectively protected from being burned out.
Optionally, as shown in fig. 9, a temperature detector 107 may be further provided in the power supply test tool for detecting whether the temperature of the first power transistor Q1 exceeds a rated value. If the rated value is exceeded, the first power tube Q1 is easily burned out.
The embodiment of the present invention does not limit the internal structure of the temperature detector 107. Fig. 10 shows a schematic structural diagram of a temperature detector 107 according to an embodiment of the present invention.
The temperature detector 107 comprises a thermistor Rntc, a second voltage comparator U4, a fourth power tube Q4, a fifth power tube Q5 and a second indicator light LED 2;
a first input end of the second voltage comparator U4 is used for collecting the voltage of the thermistor Rntc; a second input terminal of the second voltage comparator U4, configured to collect a second reference voltage; the thermistor Rntc is arranged adjacent to the first power tube Q1;
a second voltage comparator U4 for outputting a second signal when the voltage of the thermistor Rntc is higher than a second reference voltage; the second signal is used to control the fourth power transistor Q4 to be turned on, so as to light the second indicator light LED2, and control the fifth power transistor Q5 to be turned on, so that the output terminal of the operational amplifier U2 is grounded.
The voltage at the first input of the second voltage comparator U4 is provided by VCC and thermistors Rntc and R12, and the voltage at the second input is provided by VCC, R11 and R12. When the temperature of the first power tube Q1 becomes high, the resistance value of the thermistor Rntc becomes small, the voltage of the first input end of the second voltage comparator U4 becomes large, and when the voltage of the first input end of the second voltage comparator U4 is greater than the voltage of the second input end, the second voltage comparator U4 outputs a second signal to turn on the fourth power tube Q4, and the second indicator light LED2 is lit to indicate that the temperature at the first power tube Q1 exceeds a rated value. Meanwhile, the fifth power transistor Q5 is turned on, and the upper end of the fifth power transistor Q5 is connected to the first end of the first power transistor Q1 in the driving unit 104. Therefore, when the fifth power transistor Q5 is turned on, the voltage signal at the first terminal of the first power transistor Q1 is set to zero, and the first power transistor Q1 is turned off. The problem that the first power tube Q1 is burnt out due to the excessively high temperature is effectively prevented.
Optionally, as shown in fig. 11, an over-voltage detector 108 may also be provided in the power testing tool for detecting whether the voltage value at the load interface 105 exceeds a rated value. If the rated value is exceeded, the first power tube Q1 is easily burned out.
Embodiments of the present invention do not limit the internal structure of the overvoltage detector 108. Fig. 12 is a schematic structural diagram of an overvoltage detector 108 according to an embodiment of the invention.
The overvoltage detector comprises a third voltage comparator U5, a sixth power tube Q6 and a third indicator light LED 3;
a first input end of the third voltage comparator U5 for collecting the voltage output to the test object; a second input terminal of the third voltage comparator U5, configured to collect a third reference voltage;
a third voltage comparator U5 for outputting a third signal when the voltage output to the test object is higher than a third reference voltage; the third signal is used to control the sixth power transistor Q6 to be turned on, so as to light the third indicator LED 3.
The voltage of the first input terminal of the third voltage comparator U5 is provided by the load interface 105 voltage, the resistors R19 and R18, the voltage of the second input terminal is provided by VCC, the resistors R16 and R17, when the load interface 105 voltage is too high, the voltage of the first input terminal of the third voltage comparator U5 is greater than the voltage of the second input terminal, and the third voltage comparator U5 outputs a third signal. The sixth power transistor Q6 is turned on and the second indicator LED2 is illuminated to indicate to the user that the load interface 105 is too high and above nominal. In this way, the problem of burnout caused by the excessively high temperature of the first power tube Q1 is effectively prevented.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for testing a power supply, comprising:
the control unit determines a test mode of the power supply test according to the detected pressing duration of the first key; the test mode is any one of a static load pulling mode, a dynamic load pulling mode and a load pulling slope adjusting mode; the static load-pulling mode is used for providing constant load-pulling current for a test object; the dynamic pull-load mode is used for providing variable pull-load current for the test object; the load-pulling slope adjusting mode is used for providing load-pulling current with constant load-pulling slope for the test object;
the control unit determines a voltage signal output in the test mode according to the detected pressing state of the second key or the third key;
and the driving unit provides a pull-load current which accords with the test mode for the test object according to the received voltage signal.
2. The method of claim 1, wherein the determining, by the control unit, the test mode for the power test based on the detected duration of the pressing of the first key comprises:
when the control unit confirms that the pressing duration of the first key is less than a first time period, the test mode is adjusted to be a static pull-load mode;
when the control unit confirms that the pressing duration of the first key is not less than the first time interval and not more than the second time interval, the test mode is adjusted to be a dynamic pull-loading mode;
and when the control unit confirms that the pressing duration of the first key is greater than the second time interval, the test mode is adjusted to a load pulling slope adjusting mode.
3. The method of claim 1, wherein the test mode is a static pull load mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
and the control unit correspondingly adjusts the output value of the voltage signal up or down according to the detected pressing times of the second key or the third key.
4. The method of claim 1, wherein the test mode is a dynamic pull load mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
when the control unit detects that the pressing duration of a fourth key is less than a fourth time period, the dynamic load pulling mode is adjusted to be a dynamic load pulling low-value mode;
when the control unit detects that the pressing duration of a fourth key is not less than the fourth time period, the dynamic load pulling mode is adjusted to be a dynamic load pulling high value mode;
and in the dynamic load pulling low value mode or the dynamic load pulling high value mode, the control unit correspondingly adjusts the minimum value or the maximum value of the voltage signal output up or down according to the detected pressing times of the second key or the third key.
5. The method of claim 1, wherein the test mode is a pull-load slope adjustment mode;
the control unit determines the voltage signal output in the test mode according to the detected pressing state of the second key or the third key, and the method comprises the following steps:
and the control unit correspondingly adjusts the rising time of the voltage signal from the minimum value to the maximum value up or down according to the detected pressing times of the second key or the third key.
6. A power supply testing tool, comprising:
the key unit comprises keys electrically connected with the control unit;
the control unit is used for determining a test mode of the power supply test according to the detected pressing duration of the first key; the test mode is any one of a static load pulling mode, a dynamic load pulling mode and a load pulling slope adjusting mode; the static load-pulling mode is used for providing constant load-pulling current for a test object; the dynamic pull-load mode is used for providing variable pull-load current for the test object; the load-pulling slope adjusting mode is used for providing load-pulling current with constant load-pulling slope for the test object; the test module is also used for determining a voltage signal output to the driving unit in the test mode according to the detected pressing state of the second key or the third key;
and the driving unit is used for providing the load current which accords with the test mode for the test object according to the received voltage signal.
7. The tool of claim 6,
the driving unit comprises an operational amplifier, a fifth resistor, a first power tube and a sampling resistor;
the first power tube is connected with the sampling resistor in series; the operational amplifier is connected with the fifth resistor in series;
the same-direction input end of the operational amplifier is used for receiving the voltage signal; the inverting input end of the operational amplifier is connected with the sampling resistor;
the first power tube is configured to control a conduction state of the first power tube according to a signal difference between a first end of the first power tube and a third end of the first power tube, where the first end is connected to an output end of the operational amplifier, a second end of the first power tube is connected to the test object, and the third end is connected to the sampling resistor.
8. The tool of claim 6, further comprising: a current detector;
the current detector comprises a first voltage comparator, a second power tube, a third power tube and a first indicator light;
the first input end of the first voltage comparator is used for collecting the voltage of the sampling resistor; the second input end of the first voltage comparator is used for collecting a first reference voltage;
the first voltage comparator is used for outputting a first signal when the voltage of the sampling resistor is higher than the first reference voltage; the first signal is used for controlling the second power tube to be conducted so as to light the first indicator lamp, and controlling the third power tube to be conducted so as to enable the output end of the operational amplifier to be grounded.
9. The tool of claim 6, further comprising: a temperature detector;
the temperature detector comprises a thermistor, a second voltage comparator, a fourth power tube, a fifth power tube and a second indicator light;
the first input end of the second voltage comparator is used for collecting the voltage of the thermistor; the second input end of the second voltage comparator is used for collecting a second reference voltage; the thermistor is arranged adjacent to the first power tube;
the second voltage comparator is used for outputting a second signal when the voltage of the thermistor is higher than the second reference voltage; the second signal is used for controlling the fourth power tube to be conducted so as to light the second indicator light, and controlling the fifth power tube to be conducted so as to enable the output end of the operational amplifier to be grounded.
10. The tool of claim 6, further comprising: an overvoltage detector;
the overvoltage detector comprises a third voltage comparator, a sixth power tube and a third indicator light;
the first input end of the third voltage comparator is used for collecting the voltage output to the test object; the second input end of the third voltage comparator is used for collecting a third reference voltage;
the third voltage comparator is used for outputting a third signal when the voltage output to the test object is higher than the third reference voltage; the third signal is used for controlling the sixth power tube to be conducted, so that the third indicator lamp is lightened.
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| CN202111126719.6A CN113655400A (en) | 2021-09-26 | 2021-09-26 | Power supply testing method and tool |
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| CN202111126719.6A CN113655400A (en) | 2021-09-26 | 2021-09-26 | Power supply testing method and tool |
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