CN113740759A - Switching power supply performance testing device - Google Patents
Switching power supply performance testing device Download PDFInfo
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- CN113740759A CN113740759A CN202111050917.9A CN202111050917A CN113740759A CN 113740759 A CN113740759 A CN 113740759A CN 202111050917 A CN202111050917 A CN 202111050917A CN 113740759 A CN113740759 A CN 113740759A
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Abstract
A switching power supply performance testing device comprises a switching power supply decomposition module, a data measurement module and a data analysis module, wherein the switching power supply decomposition module is used for simulating the situation of a switching power supply when various faults occur, the data measurement module is used for detecting the working voltage and current of each detection point in the switching power supply decomposition module, and the data analysis module is used for analyzing according to the data detected by the data measurement module, judging whether the state of the switching power supply is normal or not and determining fault points. The invention improves the test condition and provides corresponding training and teaching conditions, improves the overhaul skill and maintenance skill of staff, shortens the search time of the fault point of the switching power supply, provides good guarantee for the operation safety of rail transit and has good social and economic benefits.
Description
Technical Field
The invention relates to a performance testing device of a switching power supply.
Background
A switching power supply, also known as an exchange power supply or a switching converter, is a high-frequency power conversion device, and is a kind of power supply, and its function is to convert a level voltage into a voltage or a current required by a user terminal through different forms of architectures.
When equipment fails, a large percentage of this occurs due to power failure. Therefore, if the causes of various switching power supply faults can be better analyzed, predictive fault warning can be favorably carried out on the field equipment.
Disclosure of Invention
The invention aims to provide a switching power supply performance testing device, which improves testing conditions, provides corresponding training and teaching conditions, improves the overhaul skills and maintenance skills of staff, shortens the search time of fault points of the switching power supply, provides good guarantee for the operation safety of rail transit, and has good social and economic benefits.
In order to achieve the above object, the present invention provides a switching power supply performance testing apparatus, comprising:
the switching power supply decomposition module is used for simulating the conditions of the switching power supply when various faults occur;
the data measurement module is connected with the switching power supply decomposition module through a circuit and is used for detecting the working voltage and current of each detection point in the switching power supply decomposition module;
and the data analysis module is in circuit connection with the data measurement module and is used for analyzing according to the data detected by the data measurement module, judging whether the state of the switching power supply is normal or not and determining a fault point.
The switching power supply decomposition module comprises: the rectifier filter circuit, the control circuit, the main switch transformation isolation circuit and the rectifier output circuit;
the input end of the rectification filter circuit is connected with an external power supply, and the output end of the rectification filter circuit is connected to the input end of the control circuit; four fault switches K1-K4 and a detection point TP1 are arranged in the rectifying and filtering circuit;
the input end of the control circuit is connected to the output end of the rectification filter circuit, the feedback input end of the control circuit is connected to the feedback output end of the rectification output circuit, and the output end of the control circuit is connected to the input end of the main switch conversion isolation circuit; a fault switch K5 and three detection points TP 2-TP 4 are arranged in the control circuit;
the input end of the main switch transformation isolation circuit is connected to the output end of the control circuit, and the output end of the main switch transformation isolation circuit is connected to the input end of the rectification output circuit;
the input end of the rectification output circuit is connected to the output end of the control circuit, the feedback output end is connected to the feedback input end of the control circuit, and the output end outputs direct-current regulated voltage; the rectification output circuit is provided with three fault switches K6-K8 and four detection points TP 5-TP 8.
Eight fault switches in the switching power supply decomposition module are normally closed contacts, and the connection relationship between the eight fault switches and the eight detection points is as follows:
the first fault switch K1 is connected in series with the input power fuse end of the rectifying and filtering circuit;
the second fault switch K2 is connected in series with any one bridge arm of a rectifier bridge of the rectifying and filtering circuit;
the third fault switch K3 and the fourth fault switch K4 are respectively connected in series to a first filter capacitor C3 and a second filter capacitor C4 of the rectifying and filtering circuit after rectification, and the capacitors of the first filter capacitor C3 and the second filter capacitor C4 are not equal;
the fifth fault switch K5 is connected in series with a compensation capacitor C10 at the power supply end of an oscillating chip IC of the control circuit;
the sixth fault switch K6 is connected in series with the pre-stage filter capacitor C22 of the rectification output circuit;
the seventh fault switch K7 is connected in series with the post-stage filter capacitor C23 of the rectification output circuit;
one end of an eighth fault switch K8 is connected with the power output end of the rectification output circuit, and the other end of the eighth fault switch K8 is connected with a trimming resistor W in the feedback circuit;
the first detection point TP1 is connected to the output end of the rectifying and filtering circuit;
the second detection point TP2, the third detection point TP3 and the fourth detection point TP4 are respectively connected to an oscillation output pin, a reference voltage output pin and a current feedback pin of an oscillation chip IC of the control circuit;
a fifth detection point TP5 is arranged at the output end of the main switch conversion isolation circuit;
the sixth detection point TP6 is connected in series to the pre-stage filter capacitor of the rectification output circuit;
the seventh detection point TP7 is connected in series to the post-stage filter capacitor of the rectification output circuit;
the eighth detection point TP8 is connected to the feedback circuit of the rectification output circuit.
The eight detection points are connected to the data measurement module through a relay board.
The main switch conversion isolating circuit comprises a protection resistor which is connected in parallel with an output port of the main switch conversion isolating circuit.
The data measurement module includes:
the voltage measuring meter and the current measuring meter are connected with different detection points in the switch power supply decomposition module and can directly test working voltage and current of the different detection points;
and the electronic load instrument is connected with the switch power supply decomposition module and can simulate a connected load when the switch power supply works.
The switching power supply performance testing device further comprises: and the data display module is connected with the data measurement module through a circuit and is used for displaying the working voltage and current of each detection point.
The switching power supply performance testing device further comprises: and the analysis result display module is electrically connected with the data analysis module and is used for displaying an analysis conclusion.
The switching power supply performance testing device further comprises: and the power supply module is connected with the switching power supply decomposition module, the data measurement module, the data display module, the data analysis module and the analysis result display module and respectively outputs power supply to the modules.
The power supply module includes:
the circuit of the power supply main switch is connected with the switching power supply decomposition module, the data measurement module, the data display module, the data analysis module and the analysis result display module and is used for starting and stopping the main power supply;
the circuit of the measurement module switch is connected with the data measurement module and the data display module and is used for opening and closing the data measurement module and the data display module;
and the circuit of the isolation transformer is connected with the switching power supply decomposition module and provides safe alternating-current working voltage for the isolation transformer.
The invention can test the electrical characteristics of various switching power supplies, can measure the working current and voltage of each working point, analyze and display fault points, has a fault simulation function, is convenient for demonstration and teaching of related training of the switching power supplies, improves the maintenance skill, the maintenance skill and the skill training of staff, enables the staff to have better fault analysis and judgment capability, and can better process faults when faults occur, thereby ensuring the safe operation of the subway. The invention has stronger practicability and reliability, is convenient for data sampling and analysis, can test the relevant electrical characteristics of the switching power supply in detail and objectively, provides relevant data for fault processing, improves the test condition and provides corresponding training and teaching conditions, provides good guarantee for the operation safety of rail transit, shortens the search time of the fault point of the switching power supply, greatly improves the fault processing speed and makes up the blank of the technology. The invention is based on independent construction, can reduce purchasing cost and has good social and economic benefits.
Drawings
Fig. 1 is a schematic structural diagram of a switching power supply performance testing apparatus provided in the present invention.
Fig. 2 is a circuit diagram of a rectifying and filtering circuit of the switching power supply decomposition module.
Fig. 3 is a circuit diagram of a control circuit of the switching power supply decomposition module.
Fig. 4 is a circuit diagram of a main switch conversion isolation circuit of the switching power supply decomposition module.
Fig. 5 is a circuit diagram of a rectified output circuit of the switching power supply decomposition module.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 5.
As shown in fig. 1, the present invention provides a switching power supply performance testing apparatus, including:
the power supply module 1 is connected with the switching power supply decomposition module 2, the data measurement module 5, the data display module 7, the data analysis module 6 and the analysis result display module 8, and respectively supplies power to and outputs the power to the modules;
the switch power supply decomposition module 2 is used for decomposing the switch power supply into four decomposition modules, namely a rectification filter circuit, a control circuit, a main switch transformation isolation circuit and a rectification output circuit, and is used for simulating the conditions of the switch power supply when various faults occur;
the data measurement module 5 is connected with the switching power supply decomposition module 2 in a circuit and used for detecting the working voltage and current of each working point when the switching power supply to be detected works;
the data analysis module 6 is electrically connected with the data measurement module 5 and is used for analyzing according to the data detected by the data measurement module 5, judging whether the state of the detected switching power supply is normal or not and determining a fault point;
the data display module 7 is connected with the data measurement module 5 by a circuit and is used for displaying the working voltage and current of each point of the detected switching power supply detected by the output data measurement module when the switching power supply works;
and the analysis result display module 8 is electrically connected with the data analysis module 6 and is used for displaying the analysis conclusion analyzed by the data analysis module.
In this embodiment, the power supply module 1 includes:
the circuit of the power supply main switch is connected with each sub-module and used for starting and stopping the main power supply;
the measuring module switch is electrically connected with the data measuring module 5 and the data display module 7 and is used for switching on and off;
and the circuit of the isolation transformer is connected with the switching power supply decomposition module 2 and provides safe alternating-current working voltage for the isolation transformer.
In this embodiment, the power supply module 1 provides 220V ac power.
The data measurement module 5 includes:
the voltage measuring meter and the current measuring meter are connected with different measuring points in the switch power supply decomposition module 2, and can directly test the working voltage and current of different working points;
and the electronic load instrument is connected with the switching power supply decomposition module 2 and can simulate a connected load when the switching power supply works.
The data analysis module 6 adopts a computer mainboard, a data port of the data analysis module is connected with an output port of the data measurement module 5 through serial port wiring, working voltage and working current of each point are measured by the data measurement module 5 and then transmitted to the computer mainboard through a serial port, data analysis is carried out through special software, whether the working state of the tested switching power supply is normal or not is judged, and if the working state is abnormal, a fault point and a fault reason are displayed.
In this embodiment, the data display module 7 adopts 7 segments of nixie tubes, and the analysis result display module 8 adopts a display.
The switch power supply decomposition module 2 comprises a rectification filter circuit, a control circuit, a main switch transformation isolation circuit and a rectification output circuit, wherein an external alternating current 220V power supply is supplied to the rectification filter circuit, the rectification filter circuit carries out rectification and filtration and then works for the control circuit, when the control circuit normally works, an output signal is supplied to the main switch transformation isolation circuit (transformer), the main switch transformation isolation circuit outputs voltage to the rectification output circuit to carry out rectification and filtration, and finally, corresponding direct current voltage stabilization voltage is output. The switch power supply decomposition module 2 comprises eight fault switches, and different fault expressions of the switch power supply can be simulated by pressing different switches. Four fault points K1-K4 are arranged in the rectifying and filtering circuit, and a detection point TP1 is led out; a fault point K5 is arranged in the control circuit, and three detection points TP 2-TP 4 are led out; three fault points K6-K8 are arranged in the rectification output circuit, and four detection points TP 5-TP 8 are led out; the 8 detection points are connected to the data measurement module 5 through an 8-way relay board.
As shown in FIG. 2, in the rectifying and filtering circuit, the two left terminals 1- (1) and 1- (2) are the total voltage input, i.e. 220v ac input, K1-K4 in fig. 2 are buttons of four fault switches (because the button passes a small current, a relay board is used, and the contact of the relay is used for disconnection and connection, the same is true below), TP1 is a waveform detection port, a detection point TP1 can detect the rectification condition of a bridge rectifier diode and the filtering condition after rectification, the detection point TP1 provides the input power for the control circuit, the performance of the detection point TP1 directly affects the operating efficiency of the control circuit, the two rightmost output ports 1- (6) (7) and 1- (10) in fig. 2 are connected to the left ports 2- (1) and 2- (10) of the control circuit in fig. 3.
As shown in fig. 3, in the control circuit, the two left ports 2- (1) and 2- (10) (where 2- (10) is the ground) are connected to the two ports 1- (6) (7) and 1- (10) of the right output of the rectifying and filtering circuit in fig. 2 by connecting wires, the upper 2 ports 2- (1) and 2- (3) of the right side of fig. 3 are connected to the ports 3- (1) and 3- (2) of the main switching converting and isolating circuit in fig. 4, the ground and one port 2- (2) of the middle of fig. 3 are connected to the ports 3- (4) and 3- (5) of the main switching converting and isolating circuit in fig. 4, the lower two ports 2- (4) and 2- (6) of fig. 3 are connected to the lowest two ports 4- (3) and 4- (4) of the left side of the rectifying and outputting circuit in fig. 5, TP 2-TP 4 are waveform detection ports, and K5 is a fault button.
As shown in fig. 4, in the main switch conversion isolation circuit, the left ports 3- (1) and 3- (2) and 3- (4) and 3- (5) are connected to the right port of the control circuit in fig. 3 (the port No. 3- (3) of the main switch conversion isolation circuit is a null port), the port combination 3- (6) and 3- (7) and the port combination 3- (9) and 3- (10) on the right side of the main switch conversion isolation circuit are connected to the two upper left ports 4- (1) and 4- (5) (10) of the rectified output circuit in fig. 5 (the port No. 3- (8) of the main switch conversion isolation circuit is a null port). The resistor R16 in fig. 4 is connected in parallel to the output ports 3- (6), 3- (7) and 3- (9), 3- (10) of the main switch conversion isolation circuit, in order to prevent the control circuit from being burnt out when the rectification output circuit is not plugged.
As shown in fig. 5, the two upper ports 4- (1) and 4- (5) (10) on the left side of the rectification output circuit are connected to the right ports 3- (6) and 3- (7) and the ports 3- (9) and 3- (10) of the main switching conversion isolation circuit in fig. 4, the two lower ports 4- (3) and 4- (4) are connected to the two lowest ports 2- (4) and 2- (6) on the right side of the control circuit in fig. 3, the two right ports 4- (6) and 4- (5) (10) of the rectification output circuit are output ports of the switching power supply decomposition module 2, TP 5-TP 8 are waveform detection ports, and K6-K8 are fault buttons. The rectification output circuit comprises two parts of circuits, wherein one part is a rectification filter circuit, and the other part is a feedback circuit. The rectification filter circuit includes: the working principle of the rectifier filter circuit comprises resistors R15, R16 and R17, capacitors C21, C22 and C23, an inductor L2, a diode D9, a light-emitting diode LED and the working principle of the rectifier filter circuit: 4- (1) and 4- (5)//4- (10) receive the voltage of the output end of the main switch conversion isolation circuit (power circuit decomposition module 3), half-wave rectification is carried out through a Schottky diode D9, and filtered direct-current voltage output is obtained through a Pi (pall) type filter circuit consisting of C22, L2 and C23, R16 is a no-load protection resistor, and R17 and a light-emitting diode LED form output state display. The feedback circuit includes: resistors R18, R19, R20 and R21, a trimming resistor W, a capacitor C24 and a switching tube Q2, and the working principle of the feedback circuit is as follows: the feedback circuit is introduced from an output voltage end, one output voltage anode is directly sent to a rear port 2- (4) of the control circuit through a resistor R18 and a port 4- (3), and the other output voltage anode is also used for obtaining a controlled stable reference voltage (the magnitude of the reference voltage value is adjusted by a trimming resistor W) through W, R21, R22 and Q2 and then is sent to a port 2- (6) of the control circuit through the port 4- (4).
When the output voltage is reduced, the voltage passing through the R18 is also reduced, namely, the voltage at the port 4- (3) is reduced, the voltage equal to the voltage at the port 2- (4) is reduced, the voltage is sent to the input end of the optical coupling chip IC1 (the other end of the optical coupling input is stable reference voltage), the emission power of a light emitting tube inside the optical coupling chip IC1 is reduced, the conduction quantity of an internal receiving end is reduced, namely, the internal resistance is increased, the voltage at the output end of the optical coupling chip IC1 is reduced, the value of the output end is divided by the R14 and the R15 and then sent to the No. 2 pin (voltage feedback input) of the oscillation chip IC is reduced, the No. 2 pin (voltage feedback input control output pulse width) of the oscillation chip IC causes the increase of the output pulse width of the No. 6 pin of the oscillation chip IC, and the output voltage is increased after the Q1 and the main switch conversion of the isolation circuit. Similarly, when the output voltage is increased, the pulse width output by the oscillation chip IC after feedback is narrow, and the output voltage is reduced, so that the purpose of stabilizing the voltage output is achieved. The trimming resistor W in the feedback circuit is set for the feedback amount, that is, the initial value of the output voltage. Any one of the output voltages 21V to 27V can be set (the present test station is set to 24V), and once set, the output voltage will stabilize at this value under rated power conditions. The optocoupler chip IC1 has two functions, one is capable of adjusting, and the most important other is capable of having front and rear stage electrical isolation functions.
The connection forms a complete switch power supply structure. The fault switches K1-K8 in the figure are communicated under normal conditions, when any one of the switches K1-K8 is pressed down, the corresponding contact is disconnected, different fault phenomena can occur, and when different faults occur, different fault waveforms can be reflected from TP 1-TP 8. The 8 simulated faults K1-K8 are set corresponding to the damage or performance reduction of key components in the switch power supply. During training, the trainees can intuitively know the trainees by pressing the buttons K1-K8.
Each decomposition module in the switch power supply decomposition module 2 is provided with 11 plug sockets at the back, wherein 10 plug sockets are used for connecting functions, and 1 plug socket is used for identifying the plug socket, so that the wrong insertion position of the decomposition module is prevented. All fault switches (K1-K8) are button switches with self-locking function, because the contact of the button switches bears too small current, the normally closed contact of the relay is used as a break-make point, namely the fault point in the circuit is in a closed state at ordinary times, when K1-K8 act, the corresponding relay acts, the normally closed contact is broken, and the fault setting requirement is met. The back of each decomposition module corresponds to 10 plug terminals, so that the use of fault setting connection and waveform detection is convenient.
All the test points (TP 1-TP 8) are independently connected to 8 ports of a test panel of the oscilloscope through a plug-in end behind the decomposition module, which path of waveform needs to be detected, and which path of the test line of the oscilloscope is connected, so that the waveform of the corresponding test point is conveniently observed.
Specifically, the first fail switch K1 is connected in series to the input power fuse end, and with the normally closed relay contact as an access point, when the first fail switch K1 is actuated, the relay is actuated, and the normally closed relay contact is opened, thereby meeting the fault setting requirement (the same applies below).
The second fault switch K2 is connected in series to any one bridge arm of four diodes in bridge rectification, when the second fault switch K2 acts, a connecting point is disconnected, bridge full-wave rectification becomes half-wave rectification, the fault phenomenon of a power supply under the condition of half-wave rectification is simulated, the first detection point TP1 is connected to a 1-gang-four foot at the output end of the rectification filter circuit, and the waveform change condition after rectification can be obviously seen through an oscilloscope.
The third fault switch K3 and the fourth fault switch K4 are respectively connected in series to the rectified first filter capacitor C3 and the rectified second filter capacitor C4, C3 and C4 are capacitors with 2 different capacities, the rectified filter change conditions under different capacities can be simulated through the third fault switch K3 and the fourth fault switch K4, and the waveform change state under the conditions can be observed through the first detection point TP 1.
The fifth fault switch K5 is connected in series with a compensation capacitor C10 at the IC power supply end (No. 7 pin) of the oscillating chip, when the fifth fault switch K5 acts, the compensation capacitor is equivalently disconnected, the oscillating chip does not work, and the fault that the chip does not work is simulated. The second detection point TP2, the third detection point TP3, and the fourth detection point TP4 are respectively connected to pins 6, 8, and 3 of the oscillation chip IC of the control circuit, the pin 8 is a chip reference voltage output, the pin 3 is a current feedback pin, and the output pulse width of the pin 6 of the oscillation chip is adjusted according to the magnitude of the current feedback. At the key points, detection points of TP 2-TP 4 are arranged (for more convenient visual detection, the TP4 is moved forward to a source current sampling pin of Q1), so that the waveform change condition of the chip under different states of power supply operation can be observed conveniently. The waveform change condition at this time can be detected by the second detection point TP2 and the third detection point TP3 of the oscilloscope, and the waveform change condition of the power supply output under the condition of different load powers can be detected by the fourth detection point TP4 of the oscilloscope in current feedback detection.
The sixth fault switch K6 and the seventh fault switch K7 are connected in series with the output front and rear filter capacitors C22 and C23, through actions of K6 and K7, different phenomena of faults of the front filter capacitor and the rear filter capacitor are simulated, meanwhile, the change situation of the waveform can be observed through a fifth detection point TP5, a sixth detection point TP6 and a seventh detection point TP7, and the fifth detection point TP5 is directly arranged on the output end of the main switch conversion isolation circuit, so that the primary state and the waveform change situation when the output current is sent to the rear stage for rectification can be conveniently observed. .
One end of the eighth fault switch K8 is connected to the power output terminal (4- (6)) of the rectification output circuit, and the other end is connected to the trimming resistor W, the eighth fault switch K8 is output feedback detection, and when K8 is activated, which corresponds to a loss of the output detection function, the output protection function of the circuit is activated because the preceding stage control circuit cannot obtain a feedback signal, and the rectification output circuit outputs the unregulated voltage. The eighth detection point TP8 can detect the waveform condition under different feedback (a trimming resistor on the side of K8 in the figure) to change different feedback values, and K8 acts to lose the feedback values. When the external switch power supply needs to be measured, the switch power supply is connected with the test board, then the power supply main switch is started, then the working power supply and the computer switch are respectively started, the special analysis software in the computer is started, the test board enters a measurement preparation state, the input voltage required by the switch power supply can be adjusted by rotating the voltage adjusting knob, and meanwhile, the load knob on the external load instrument is adjusted to the lowest value. After the preparation is made, a start button on the main panel is pressed down, the switching power supply starts to work, then the load button is slowly adjusted to a required load value, and at the moment, the display module above the main panel can display the working voltage and current of each working point of the switching power supply. Meanwhile, the computer receives the data through the serial port, the analysis software analyzes and judges whether the switching power supply works normally or not, and if not, the position of a fault point is analyzed.
When personnel training or teaching is to be carried out, the modules which are formed by decomposing the switching power supply can be inserted into the corresponding sockets, after the preparation work which is the same as that of the external switching power supply is carried out, the main panel start button is pressed down, the load value is adjusted, and at the moment, each decomposition module works normally. When the fault simulation button K1-8 is pressed, corresponding eight different faults can be simulated, which are respectively: when the K1 button acts, the fuse of the demonstration module is damaged, only the input voltmeter is displayed on the panel table at the moment, and the other values are displayed; the K2 button acts to demonstrate bridge rectification fault, the input ammeter value of the panel meter is increased, and the working voltmeter value is reduced; the K3 button acts to demonstrate that the value of the filter capacitor is slightly reduced, and the panel indication shows a tiny value; the K4 button acts to demonstrate that the filter capacitor is damaged, the display of the panel input current becomes large, and the display of the working voltage becomes obviously small; the K5 button acts to demonstrate that the oscillating chip does not work or is damaged, and the power supply has no output voltage; the K6 button acts to demonstrate that the output rectifying filter capacitor is damaged and the output voltmeter drops sharply; the K7 button acts to demonstrate that the output post-stage filter capacitor is damaged and the output voltage is reduced; the K8 button acts to demonstrate the fault of the output feedback circuit, at the moment, the light emitting diode in the No. 4 module flickers, and the output voltage is reduced. These failure points and phenomena can all be derived in the analysis software.
The invention can test the electrical characteristics of various switching power supplies, can measure the working current and voltage of each working point, analyze and display fault points, has a fault simulation function, is convenient for demonstration and teaching of related training of the switching power supplies, improves the maintenance skill, the maintenance skill and the skill training of staff, enables the staff to have better fault analysis and judgment capability, and can better process faults when faults occur, thereby ensuring the safe operation of the subway. The invention has stronger practicability and reliability, is convenient for data sampling and analysis, can test the relevant electrical characteristics of the switching power supply in detail and objectively, provides relevant data for fault processing, improves the test condition and provides corresponding training and teaching conditions, provides good guarantee for the operation safety of rail transit, shortens the search time of the fault point of the switching power supply, greatly improves the fault processing speed and makes up the blank of the technology. The invention is based on independent construction, can reduce purchasing cost and has good social and economic benefits.
The invention not only supports the test of a single switch power supply, but also can simultaneously support the insertion of an external power supply or a switch power supply decomposition module, after different switch power supplies are connected, the fault is analyzed and judged according to software and is displayed by a display unit, thereby greatly shortening the fault finding time of the switch power supply when the fault occurs, reducing the test time of the switch power supply, and also arranging a fault simulation module for training personnel on the aspect of switching the power supply, thereby saving the maintenance cost and increasing the training conditions.
Therefore, the working group plans to build a performance test platform of the switching power supply, so as to
It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship shown in the drawings, and are only for convenience of describing the embodiments, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A kind of switching power supply performance testing device, characterized by that, comprising:
the switching power supply decomposition module is used for simulating the conditions of the switching power supply when various faults occur;
the data measurement module is connected with the switching power supply decomposition module through a circuit and is used for detecting the working voltage and current of each detection point in the switching power supply decomposition module;
and the data analysis module is in circuit connection with the data measurement module and is used for analyzing according to the data detected by the data measurement module, judging whether the state of the switching power supply is normal or not and determining a fault point.
2. The device for testing the performance of the switching power supply according to claim 1, wherein the switching power supply decomposition module comprises: the rectifier filter circuit, the control circuit, the main switch transformation isolation circuit and the rectifier output circuit;
the input end of the rectification filter circuit is connected with an external power supply, and the output end of the rectification filter circuit is connected to the input end of the control circuit; four fault switches K1-K4 and a detection point TP1 are arranged in the rectifying and filtering circuit;
the input end of the control circuit is connected to the output end of the rectification filter circuit, the feedback input end of the control circuit is connected to the feedback output end of the rectification output circuit, and the output end of the control circuit is connected to the input end of the main switch conversion isolation circuit; a fault switch K5 and three detection points TP 2-TP 4 are arranged in the control circuit;
the input end of the main switch transformation isolation circuit is connected to the output end of the control circuit, and the output end of the main switch transformation isolation circuit is connected to the input end of the rectification output circuit;
the input end of the rectification output circuit is connected to the output end of the control circuit, the feedback output end is connected to the feedback input end of the control circuit, and the output end outputs direct-current regulated voltage; the rectification output circuit is provided with three fault switches K6-K8 and four detection points TP 5-TP 8.
3. The switching power supply performance testing device according to claim 2, wherein eight fault switches in the switching power supply decomposition module are normally closed contacts, and the connection relationship between the eight fault switches and the eight detection points is as follows:
the first fault switch K1 is connected in series with the input power fuse end of the rectifying and filtering circuit;
the second fault switch K2 is connected in series with any one bridge arm of a rectifier bridge of the rectifying and filtering circuit;
the third fault switch K3 and the fourth fault switch K4 are respectively connected in series to a first filter capacitor C3 and a second filter capacitor C4 of the rectifying and filtering circuit after rectification, and the capacitors of the first filter capacitor C3 and the second filter capacitor C4 are not equal;
the fifth fault switch K5 is connected in series with a compensation capacitor C10 at the power supply end of an oscillating chip IC of the control circuit;
the sixth fault switch K6 is connected in series with the pre-stage filter capacitor C22 of the rectification output circuit;
the seventh fault switch K7 is connected in series with the post-stage filter capacitor C23 of the rectification output circuit;
one end of an eighth fault switch K8 is connected with the power output end of the rectification output circuit, and the other end of the eighth fault switch K8 is connected with a trimming resistor W in the feedback circuit;
the first detection point TP1 is connected to the output end of the rectifying and filtering circuit;
the second detection point TP2, the third detection point TP3 and the fourth detection point TP4 are respectively connected to an oscillation output pin, a reference voltage output pin and a current feedback pin of an oscillation chip IC of the control circuit;
a fifth detection point TP5 is arranged at the output end of the main switch conversion isolation circuit;
the sixth detection point TP6 is connected in series to the pre-stage filter capacitor of the rectification output circuit;
the seventh detection point TP7 is connected in series to the post-stage filter capacitor of the rectification output circuit;
the eighth detection point TP8 is connected to the feedback circuit of the rectification output circuit.
4. The switching power supply performance testing device according to claim 2, wherein the eight detection points are connected to the data measurement module through a relay board.
5. The device for testing the performance of the switching power supply according to claim 2, wherein the main switching transformation isolation circuit comprises a protection resistor which is connected in parallel with an output port of the main switching transformation isolation circuit.
6. The device for testing the performance of the switching power supply according to claim 2, wherein the data measurement module comprises:
the voltage measuring meter and the current measuring meter are connected with different detection points in the switch power supply decomposition module and can directly test working voltage and current of the different detection points;
and the electronic load instrument is connected with the switch power supply decomposition module and can simulate a connected load when the switch power supply works.
7. The switching power supply performance testing apparatus according to claim 2, further comprising: and the data display module is connected with the data measurement module through a circuit and is used for displaying the working voltage and current of each detection point.
8. The switching power supply performance testing apparatus according to claim 2, further comprising: and the analysis result display module is electrically connected with the data analysis module and is used for displaying an analysis conclusion.
9. The switching power supply performance testing apparatus according to claim 7 or 8, further comprising: and the power supply module is connected with the switching power supply decomposition module, the data measurement module, the data display module, the data analysis module and the analysis result display module and respectively outputs power supply to the modules.
10. The device for testing the performance of the switching power supply according to claim 9, wherein the power supply module comprises:
the circuit of the power supply main switch is connected with the switching power supply decomposition module, the data measurement module, the data display module, the data analysis module and the analysis result display module and is used for starting and stopping the main power supply;
the circuit of the measurement module switch is connected with the data measurement module and the data display module and is used for opening and closing the data measurement module and the data display module;
and the circuit of the isolation transformer is connected with the switching power supply decomposition module and provides safe alternating-current working voltage for the isolation transformer.
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| CN202111050917.9A CN113740759A (en) | 2021-09-08 | 2021-09-08 | Switching power supply performance testing device |
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| CN202111050917.9A CN113740759A (en) | 2021-09-08 | 2021-09-08 | Switching power supply performance testing device |
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Cited By (1)
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