X capacitor test circuit
By designing the X capacitor test circuit, the rectifying filter module converts the voltage, the switching module controls the charge and discharge, and the detection module detects the discharge voltage, the problem of low detection efficiency of X capacitor residual voltage is solved, and fast and accurate voltage measurement is achieved.
Patent Information
- Application Number
- CN202422072029.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In the prior art, the detection efficiency of X capacitor residual voltage is low, and repeated testing of the AC peak voltage is required, resulting in low detection efficiency.
An X-capacitance testing circuit is designed, including a rectifying filter module, a switching module, a control module and a detection module. The alternating current is converted into a DC voltage through the rectifying filter module. The switching module controls the charging and discharge states. The detection module detects the discharge voltage during discharge to achieve accurate measurement of the residual voltage of the X-capacitance.
The peak voltage is not required to be tested repeatedly, which improves the detection efficiency of the residual voltage of X capacitor and achieves fast and accurate voltage measurement.
Smart Images
Figure CN223078387U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supplies, and particularly relates to an X-capacitor test circuit. Background Art
[0002] In order to pass electromagnetic compatibility, products such as chargers, power supplies, and adapters generally have an X-capacitor, and the X-capacitor is usually arranged at the input end. As a result, when the charger, power supply and other products are unplugged from the socket, the X-capacitor will have residual charges, which can easily cause harm to the human body. Therefore, in order to eliminate potential safety hazards, after the X-capacitor is unplugged from the socket for a period of time, its voltage should be lower than a threshold voltage.
[0003] For the above reasons, one of the tests that need to be carried out after the production of chargers, power supplies and other products is to test whether the residual voltage of the X-capacitor is less than the threshold voltage. Since the voltage of the X-capacitor is alternating current, its AC peak voltage is the highest at 90 degrees of phase. During the test, it is necessary to disconnect the input voltage when the AC peak voltage is at the highest, and the test result is more accurate at this time. However, in the currently commonly used test methods, when positioning the highest value of the AC peak voltage, repeated tests are required, and the test efficiency is relatively low. Summary of the Utility Model
[0004] The utility model provides an X-capacitor test circuit, aiming to solve the problem of relatively low efficiency in detecting the residual voltage of the X-capacitor at present.
[0005] The utility model provides an X-capacitor test circuit, which includes a rectifying and filtering module, a switching module, a control module and a detection module; the input end of the rectifying and filtering module is connected to a power supply module; the input end of the switching module is connected to the rectifying and filtering module, and the output end of the switching module is connected to a device under test; the control module is connected to the switching module and is used to control the conduction and cut-off of the switching module; the detection module is connected to the output end of the rectifying and filtering module; wherein, when the device under test discharges, the detection module detects the discharge voltage of the device under test to realize the detection of the residual voltage of the X-capacitor of the device under test.
[0006] Further, the switching module includes a first switching element and a second switching element; one end of the first switching element is connected to the rectifying and filtering module, and the other end of the first switching element is connected to the device under test; one end of the second switching element is connected to the rectifying and filtering module, and the other end of the second switching element is connected to the control module.
[0007] Further, the rectifying and filtering module includes a rectifying circuit and a charging circuit; an input end of the rectifying circuit is connected to the power supply module, an output end of the rectifying circuit is connected to an input end of the charging circuit, and an output end of the charging circuit is respectively connected to the first switching element and the second switching element.
[0008] Further, the rectifying circuit includes a rectifier bridge, one end of the rectifier bridge is connected to the power supply module, and the other end of the rectifier bridge is connected to the charging circuit.
[0009] Further, the charging circuit includes a first capacitor, one end of the first capacitor is connected to the rectifying circuit, and the other end of the first capacitor is respectively connected to the first switch and the second switch.
[0010] Further, the rectifying and filtering module further includes a first fuse, one end of the first fuse is connected to the power supply module, and the other end of the first fuse is connected to the rectifying circuit.
[0011] Further, a power supply circuit is further included, one end of the power supply circuit is connected to the rectifying and filtering module, and the other end of the power supply circuit is connected to the control module.
[0012] Further, the power supply circuit includes a power supply chip, one end of the power supply chip is connected to the rectifying and filtering module, and the other end of the power supply chip is connected to the control module.
[0013] Further, the power supply circuit further includes a first resistor, a first diode, a second diode, and a third diode; one end of the first resistor is connected to the rectifying and filtering module, the other end of the first resistor is connected to a negative electrode of the first diode, a positive electrode of the first diode is connected to a negative electrode of the second diode, the positive electrode of the second diode is respectively connected to the power supply chip and a negative electrode of the third diode, and a positive electrode of the third diode is grounded.
[0014] Further, a timing circuit is further included, one end of the timing circuit is connected to the control module, and the other end of the timing circuit is grounded.
[0015] The X-capacitor test circuit disclosed by the present utility model includes a rectifying and filtering module, a switching module, a control module, and a detection module. The rectifying and filtering module is connected to a power supply module and is used for converting alternating current into direct current to provide a peak voltage. The switching module is connected between the rectifying and filtering module and a device under test. When the switching module is turned on, the rectifying and filtering module charges the device under test. When the switching module is turned off, the device under test discharges. When the device under test discharges, the detection module detects the discharge voltage of the device under test, thereby realizing the detection of the residual voltage of the X-capacitor, without repeatedly testing the peak voltage, and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0017] Figure 1 It is a block diagram of the X-capacitor test circuit provided by the first embodiment of the present invention;
[0018] Figure 2 It is a block diagram of the X-capacitor test circuit provided by the second embodiment of the present invention;
[0019] Figure 3 It is a block diagram of the X-capacitor test circuit provided by the third embodiment of the present invention;
[0020] Figure 4 It is a block diagram of the X-capacitor test circuit provided by the fourth embodiment of the present invention;
[0021] Figure 5 It is a circuit diagram of the X-capacitor test circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.
[0023] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, operations, elements, components, and / or their combinations.
[0024] It should also be understood that the terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the description of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms. It should be further understood that the term "and / or" used in the description of the present utility model and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0025] In addition, the directional terms mentioned in the present utility model, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only references to the directions of the additional drawings and the usage state of the product. Therefore, the directional terms used are for explaining and understanding the present utility model, rather than for limiting the present utility model. In addition, in the drawings, structures that are similar or the same are denoted by the same reference numerals.
[0026] See Figures 1 to 5 , Figure 1 is a block diagram of the X-capacitor test circuit 100 provided by the first embodiment of the present utility model; Figure 2 is a block diagram of the X-capacitor test circuit 100 provided by the second embodiment of the present utility model; Figure 3 is a block diagram of the X-capacitor test circuit 100 provided by the third embodiment of the present utility model; Figure 4 is a block diagram of the X-capacitor test circuit 100 provided by the fourth embodiment of the present utility model;
[0027] Figure 5 is a circuit diagram of the X-capacitor test circuit 100 provided by an embodiment of the present utility model. As Figure 1 shown, the X-capacitor test circuit 100 includes a rectifying and filtering module 10, a switching module 20, a control module 30, and a detection module 40; the input end of the rectifying and filtering module 10 is connected to a power supply module 200; the input end of the switching module 20 is connected to the rectifying and filtering module 10, and the output end of the switching module 20 is connected to a device under test 300; the control module 30 is connected to the switching module 20 for controlling the conduction and cutoff of the switching module 20; the detection module 40 is connected to the output end of the rectifying and filtering module 10; wherein, when the device under test 300 discharges, the detection module 40 detects the discharge voltage of the device under test 300 to implement the detection of the residual voltage of the X-capacitor of the device under test 300.
[0028] Specifically, the X-capacitor test circuit 100 may include a rectification and filtering module 10, a switching module 20, a control module 30, and a detection module 40. The rectification and filtering module 10 is connected to a power supply module 200 through the switching module 20. The power supply module 200 may be an AC power supply for providing a test power supply for the X-capacitor test circuit 100. The rectification and filtering module 10 is used to convert the AC voltage into a DC voltage, and the converted DC voltage is the peak voltage of the AC voltage, ensuring that the test voltage is the peak voltage of the AC voltage at any time during the test. The control module 30 may include a control chip U2, and the control chip U2 is respectively connected to the switching module 20 and the detection module 40.
[0029] The switching module 20 is connected between the rectification and filtering module 10 and the device under test 300, and the switching module 20 is also connected to the control module 30. When the switching module 20 is turned on, the rectification and filtering module 10 supplies power to the input end of the device under test 300. When the switching module 20 is turned off, the device under test 300 starts to discharge.
[0030] The detection module 40 is connected to the output end of the rectification and filtering module 10, that is, to the output end of the device under test 300. When the device under test 300 starts to discharge, the detection module 40 detects the discharge voltage at the output end of the device under test 300. This discharge voltage is the residual voltage of the X-capacitor, so that the residual voltage of the X-capacitor can be accurately measured. The detection module 40 may be a voltmeter U3 with a display screen. The voltmeter U3 is connected to the control module 30 and is controlled by the control module 30 to operate. The display screen can display the detected voltage.
[0031] In actual use, the rectification and filtering module 10 first converts the AC voltage into a DC voltage and charges the input end of the device under test 300 through the switching module 20. When the switching module 20 is turned off, the device under test 300 starts to discharge, and the test detection module 40 detects the discharge voltage of the device under test 300 to measure the residual voltage of the X-capacitor of the device under test 300.
[0032] See Figure 5 , as a further embodiment, the switching module 20 includes a first switching element S1 and a second switching element S2; one end of the first switching element S1 is connected to the rectification and filtering module 10, and the other end of the first switching element S1 is connected to the device under test 300; one end of the second switching element S2 is connected to the rectification and filtering module 10, and the other end of the second switching element S2 is connected to the control module 30.
[0033] Among them, the switching module 20 may include a first switching element S1 and a second switching element S2, as Figure 5As shown in the figure, two first switching elements S1 can be provided, respectively located at the positive electrode and the negative electrode, and the second switching element S2 is connected between the rectifying and filtering module 10 and the control module 30. The first switching element S1 and the second switching element S2 are linked switches, that is, when the first switching element S1 is turned on, the second switching element S2 is turned off, and when the first switching element S1 is turned off, the second switching element S2 is turned on. The conduction and cut-off of the first switching element S1 can be manually controlled by the staff, and the second switching element S2 adapts to the conduction state of the first switching element S1.
[0034] As Figure 5 shown, Figure 5 in the figure, the EUT is the device under test 300. When the first switching element S1 is turned on, the rectifying and filtering module 10 provides a DC voltage for the input end of the device under test 300 and charges it. At this time, the second switching element S2 is turned off. When the first switching element S1 is turned off, the device under test 300 starts to discharge. At this time, the second switching element S2 is turned on, and the control module 30 detects that the second switching element S2 is turned on and starts timing. The detection module 40 starts to detect the discharge voltage. As Figure 5 shown, the detection module 40 detects the discharge voltage by detecting the voltages at points A and B. When the discharge time of the device under test 300 reaches the set time, the detection module 40 outputs the detection result. For example, if the set time is 2 seconds, then when the discharge time of the device under test 300 reaches 2 seconds, the detection module 40 stops detecting the discharge voltage and outputs the currently collected voltage, so that the residual voltage of the X capacitor of the device under test 300 after 2 seconds of power-off can be measured.
[0035] As a further embodiment, the rectifying and filtering module 10 includes a rectifying circuit 11 and a charging circuit 12; the input end of the rectifying circuit 11 is connected to the power supply module 200, the output end of the rectifying circuit 11 is connected to the input end of the charging circuit 12, and the output end of the charging circuit 12 is respectively connected to the first switching element S1 and the second switching element S2.
[0036] Among them, the rectifying and filtering module 10 can include a rectifying circuit 11 and a charging circuit 12. The rectifying circuit 11 is used to rectify the AC voltage to obtain a DC voltage and charge the charging circuit 12. When the first switching element S1 is turned on, the charging circuit 12 discharges to charge the device under test 300.
[0037] As a further embodiment, the rectifying circuit 11 includes a rectifier bridge BD1. One end of the rectifier bridge BD1 is connected to the power supply module 200, and the other end of the rectifier bridge BD1 is connected to the charging circuit 12. Further, the charging circuit 12 includes a first capacitor EC1. One end of the first capacitor EC1 is connected to the rectifying circuit 11, and the other end of the first capacitor EC1 is respectively connected to the first switch and the second switch.
[0038] Among them, as Figure 5 shown, the rectifying circuit 11 may include a rectifier bridge BD1. The rectifier bridge BD1 may be composed of four diodes connected end to end. The rectifier bridge BD1 is used to convert the AC voltage into a DC voltage and charge the first capacitor EC1. When the first capacitor EC1 is fully charged, the first switching element S1 conducts, and the first capacitor EC1 starts to discharge and charge the device under test 300.
[0039] As a further embodiment, the rectifying and filtering module 10 further includes a first fuse. One end of the first fuse is connected to the power supply module 200, and the other end of the first fuse is connected to the rectifying circuit 11.
[0040] Among them, the first fuse is used to protect the rectifying and filtering module 10 to avoid damage to the rectifying and filtering module 10 and the device under test 300 when the AC voltage is too high.
[0041] As a further embodiment, a power supply circuit 50 is further included. One end of the power supply circuit 50 is connected to the rectifying and filtering module 10, and the other end of the power supply circuit 50 is connected to the control module 30. Further, the other end of the power supply chip U1 is connected to the control module 30. Further, the power supply circuit 50 further includes a first resistor R1, a first diode D1, a second diode D2, and a third diode D3. One end of the first resistor R1 is connected to the rectifying and filtering module 10, the other end of the first resistor R1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the cathode of the second diode D2, the anode of the second diode D2 is respectively connected to the power supply chip U1 and the cathode of the third diode D3, and the anode of the third diode D3 is grounded.
[0042] Among them, the power supply circuit 50 may include a power supply chip U1, a first resistor R1, a first diode D1, a second diode D2, and a third diode D3. The rectifying and filtering module 10 may supply power to the control module 30 through the power supply circuit 50.
[0043] As a further embodiment, a timing circuit 60 is further included. One end of the timing circuit 60 is connected to the control module 30, and the other end of the timing circuit 60 is grounded.
[0044] Among them, the timing circuit 60 may include a push-button switch S3. The push-button switch S3 is connected to the control module 30 and can adjust the discharge time. For example, it can be set that each time the push-button switch S3 is pressed, the discharge time increases by 0.1 second. The range of the discharge time can be from 0.1 second to 15 seconds, and a long-press mode can be provided. When the push-button switch S3 is long-pressed for 2 seconds, it enters the fast-adjustment mode. At this time, each time the push-button switch S3 is pressed, the discharge time increases by one second. When the time increases to the upper limit, if the discharge time is increased again, it will return to 0.1 second. The detection module 40 can be a voltmeter U3 with a display screen, and the display screen can present the currently set discharge time.
[0045] The X-capacitor test circuit disclosed by the present utility model can provide a peak voltage for the device under test through the rectification and filtering module, and switch the charging and discharging states through the switch module. When the device under test discharges, the detection module can detect the discharge voltage, thereby realizing the detection of the residual voltage of the X-capacitor of the device under test and improving the detection efficiency.
[0046] As described above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims
1. An X-capacitor test circuit, characterized in that, Comprising: A rectifying and filtering module, the input end of which is connected to a power supply module; A switching module, the input end of which is connected to the rectifying and filtering module, and the output end of which is connected to a device under test; A control module, which is connected to the switching module and is used to control the conduction and cut-off of the switching module; A detection module, which is connected to the output end of the rectifying and filtering module; Wherein, when the device under test discharges, the detection module detects the discharge voltage of the device under test to realize the detection of the residual voltage of the X-capacitor of the device under test.
2. The X-capacitor test circuit according to claim 1, wherein The switching module includes a first switching element and a second switching element; One end of the first switching element is connected to the rectifying and filtering module, and the other end of the first switching element is connected to the device under test; One end of the second switching element is connected to the rectifying and filtering module, and the other end of the second switching element is connected to the control module.
3. The X-capacitor test circuit according to claim 2, characterized in that, The rectifying and filtering module includes a rectifying circuit and a charging circuit; The input end of the rectifying circuit is connected to the power supply module, the output end of the rectifying circuit is connected to the input end of the charging circuit, and the output end of the charging circuit is respectively connected to the first switching element and the second switching element.
4. The X-capacitor test circuit according to claim 3, wherein, The rectifying circuit includes a rectifier bridge, one end of which is connected to the power supply module and the other end of which is connected to the charging circuit.
5. The X-capacitor test circuit according to claim 3, characterized in that, The charging circuit includes a first capacitor, one end of which is connected to the rectifying circuit and the other end of which is respectively connected to the first switch and the second switch.
6. The X-capacitor test circuit according to claim 3, characterized in that, The rectifying and filtering module further includes a first fuse, one end of which is connected to the power supply module and the other end of which is connected to the rectifying circuit.
7. The X-capacitor test circuit according to claim 1, wherein It further includes a power supply circuit, one end of which is connected to the rectifying and filtering module and the other end of which is connected to the control module.
8. The X-capacitor test circuit according to claim 7, wherein The power supply circuit includes a power supply chip, one end of which is connected to the rectifying and filtering module and the other end of which is connected to the control module.
9. The X-capacitor test circuit according to claim 8, wherein The power supply circuit further includes a first resistor, a first diode, a second diode and a third diode; One end of the first resistor is connected to the rectifying and filtering module, the other end of the first resistor is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the negative electrode of the second diode, the positive electrode of the second diode is respectively connected to the power supply chip and the negative electrode of the third diode, and the positive electrode of the third diode is grounded.
10. The X-capacitance test circuit according to claim 1, characterized in that, It further includes a timing circuit, one end of which is connected to the control module and the other end of which is grounded.