An anomaly protection circuit and ATE test system

Abstract

The utility model discloses an abnormal protection circuit and ATE test system, abnormal protection circuit includes signal processing module and protection relay, signal processing module includes signal input and signal output, protection relay includes first connecting end, second connecting end and first switch control end, signal processing module's signal input is used for connecting the first output of main control module to detect whether main control module is normal work, signal processing module's signal output and protection relay's first switch control end are coupled, and the first connecting end of protection relay is used for connecting the power supply output of power supply module, and the second connecting end of protection relay is used for connecting the unit of being measured, adopts above -mentioned technical scheme, can real -time detection main control module output's electric signal, and when detecting abnormal signal, immediately take measures, ensure the safety of unit of being measured, and simultaneously do not influence normal test process.

Description

Technical Field

[0001] This utility model relates to the field of basic electronic circuit integrated circuit testing technology, and in particular to an abnormal protection circuit and an ATE testing system. Background Technology

[0002] Automated Test Equipment (ATE) is an indispensable part of the chip manufacturing process, greatly reducing the need for manpower and improving testing efficiency. However, during automated testing, equipment performance, testing environment, and other unstable factors can cause ATE malfunctions, resulting in abnormal outputs that can damage the unit under test. Therefore, ATE testing equipment often requires an output anomaly protection mechanism.

[0003] The existing technology CN118443990B detects the output voltage supplied to the unit under test, triggering protection when the output voltage is abnormal. After the host computer issues a voltage adjustment command, the control module directs the power module to output voltage, and the voltage detection module monitors the output voltage in real time, feeding the detected value back to the control module. The control module performs detection based on pre-stored target upper / lower limits and feeds the result back to the host computer. The host computer confirms whether the output voltage of the power module is normal based on the detection result signal, ensuring that the output voltage of the power module is stable before proceeding with the testing process.

[0004] Existing technologies also employ interlock safety interlocks for anomaly protection, using mechanical or electrical means to mutually constrain two or more systems, devices, or operating procedures to prevent dangerous operations or accidents.

[0005] However, the above protection mechanisms all have certain shortcomings. When the main control module or host computer is abnormal, the protection of the above protection mechanisms may fail. Utility Model Content

[0006] This invention provides an anomaly protection circuit and an ATE testing system to achieve anomaly detection and protection for the main control module and / or the host computer.

[0007] In a first aspect, this utility model embodiment provides an anomaly protection circuit, which is applied to an ATE test equipment; the ATE test equipment includes a main control module and a power supply module, and the power supply control output terminal of the main control module is electrically connected to the power supply control receiving terminal of the power supply module;

[0008] The fault protection circuit includes a signal processing module and a protection relay; the signal processing module includes a signal input terminal and a signal output terminal; the protection relay includes a first connection terminal, a second connection terminal and a first switch control terminal.

[0009] The signal input terminal of the signal processing module is used to connect to the first output terminal of the main control module to detect whether the main control module is working properly; the signal output terminal of the signal processing module is coupled to the first switch control terminal of the protection relay; the first connection terminal of the protection relay is used to connect to the power supply output terminal of the power supply module, and the second connection terminal of the protection relay is used to connect to the unit under test.

[0010] Optionally, the fault protection circuit may further include a power supply control switch;

[0011] The power supply control switch is used to be connected in series between the power supply control output terminal of the main control module and the power supply control receiving terminal of the power supply module; the control terminal of the power supply control switch is electrically connected to the signal output terminal of the signal processing module.

[0012] Optionally, the signal processing module includes a low-pass filter and a window comparator;

[0013] The input terminal of the low-pass filter is electrically connected to the signal input terminal, the output terminal of the low-pass filter is electrically connected to the input terminal of the window comparator, and the output terminal of the window comparator is electrically connected to the signal output terminal.

[0014] Optionally, the signal processing module includes an integrator and a window comparator;

[0015] The input terminal of the integrator is electrically connected to the signal input terminal, the output terminal of the integrator is electrically connected to the input terminal of the window comparator, and the output terminal of the window comparator is electrically connected to the signal output terminal.

[0016] Optionally, the signal processing module includes a Fourier transform;

[0017] The input terminal of the Fourier transform is electrically connected to the signal input terminal, and the output terminal of the Fourier transform is electrically connected to the signal output terminal.

[0018] Optionally, the fault protection circuit may further include an auxiliary control module;

[0019] The auxiliary control module includes an auxiliary control input terminal and an auxiliary control output terminal; the auxiliary control input terminal of the auxiliary control module is electrically connected to the signal output terminal of the signal processing module, and the auxiliary control output terminal of the auxiliary control module is electrically connected to the first switch control terminal of the protection relay.

[0020] The auxiliary control module includes an optocoupler isolation switch and an auxiliary switch;

[0021] The auxiliary control terminal of the auxiliary switch is electrically connected to the auxiliary control input terminal; the auxiliary switch is connected in series with the light-emitting diode in the optocoupler isolation switch; the photosensitive switch in the optocoupler isolation switch is electrically connected to the auxiliary control output terminal.

[0022] Optionally, the fault protection circuit may further include an auxiliary control module;

[0023] The auxiliary control module includes an auxiliary control input terminal and an auxiliary control output terminal; the auxiliary control input terminal of the auxiliary control module is electrically connected to the signal output terminal of the signal processing module, and the auxiliary control output terminal of the auxiliary control module is electrically connected to the first switch control terminal of the protection relay.

[0024] The auxiliary control module includes an isolation relay;

[0025] The coil in the isolation relay is electrically connected to the auxiliary control input terminal, and the contact switch in the isolation relay is electrically connected to the auxiliary control output terminal.

[0026] Secondly, this utility model embodiment also provides an ATE testing system, including: ATE testing equipment, and any of the above-mentioned abnormality protection circuits;

[0027] The ATE test equipment includes a main control module and a power supply module; the main control module includes a power supply control output terminal and a first output terminal; the power supply module includes a power supply control receiver terminal and a power supply output terminal.

[0028] The power supply control output terminal of the main control module is electrically connected to the power supply control receiving terminal of the power supply module; the power supply output terminal of the power supply module is electrically connected to the first connection terminal of the protection relay, and the second connection terminal of the protection relay is used to connect to the unit under test.

[0029] The first output terminal of the main control module is electrically connected to the signal input terminal of the signal processing module, and the signal output terminal of the signal processing module is coupled to the first switch control terminal of the protection relay.

[0030] Optionally, the main control module further includes a feedback receiver;

[0031] The feedback receiving end of the main control module is electrically connected to the signal output end of the signal processing module;

[0032] The main control module is used to control the power supply module based on the signal received by the feedback receiver.

[0033] Optionally, the ATE test system further includes a relay driver; the main control module further includes a communication terminal, a second output terminal, and a communication decryption circuit; the protection relay further includes a second switch control terminal;

[0034] The communication terminal is used to connect to the host computer of the main control module. The communication terminal is also electrically connected to the input terminal of the communication decryption circuit. The output terminal of the communication decryption circuit is electrically connected to the second output terminal. The second output terminal is also electrically connected to the drive control terminal of the relay driver. The drive output terminal of the relay driver is electrically connected to the second switch control terminal of the protection relay.

[0035] The technical solution of this utility model includes a signal processing module. The signal input terminal of the signal processing module is connected to the first output terminal of the main control module to receive the electrical signal output by the first output terminal to detect whether the main control module is abnormal. The abnormal protection circuit provided in this embodiment of the utility model also includes a protection relay. The protection relay can be set between the power supply module and the unit under test. The signal output terminal of the signal processing module is electrically connected to the first switch control terminal of the protection relay. When the signal processing module detects that the main control module is normal, it can control the protection relay to conduct. When the signal processing module detects that the main control module is abnormal, it can control the protection relay to turn off, so as to avoid the power supply module providing abnormal electrical signals to the unit under test due to the abnormality of the main control module, which could damage the unit under test. The abnormal protection circuit provided by this utility model can detect the electrical signal output by the main control module in real time, and take immediate measures when the electrical signal output by the main control module exceeds the preset safety range to ensure the safety of the unit under test without affecting the normal testing process. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 1 ;

[0037] Figure 2 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 2 ;

[0038] Figure 3 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 3 ;

[0039] Figure 4 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 4 ;

[0040] Figure 5This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 5 ;

[0041] Figure 6 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 6 ;

[0042] Figure 7 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 7 ;

[0043] Figure 8 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 8 ;

[0044] Figure 9 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 9 ;

[0045] Figure 10 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 10 ;

[0046] Figure 11 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 10 one.

[0047] In the embodiments of this utility model, the reference numerals and corresponding feature names are as follows:

[0048] 01-ATE test equipment; 10-Main control module; 11-First output terminal; 12-Power supply control output terminal; 13-Feedback receiver terminal; 14-Communication terminal; 15-Second output terminal; 20-Power supply module; 21-Power supply control receiver terminal; 22-Power supply output terminal; 30-Abnormal protection circuit; 40-Signal processing module; 41-Signal input terminal; 42-Signal output terminal; 50-Alarm module; 60-Auxiliary control module; 61-Auxiliary control input terminal; 62-Auxiliary control output terminal; 70-Relay driver; 71-Drive control terminal; 72-Drive output terminal; K1-Protection relay; K11-First switch control terminal of protection relay; K12-Second switch control terminal of protection relay; K13-First connection terminal of protection relay; K14-Second connection terminal of protection relay; K2-Power supply control switch; K23-Control terminal of power supply control switch; K3-Isolation relay. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Figure 1 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 1 ,refer to Figure 1 The abnormal protection circuit 30 can be applied to the ATE test equipment 01. The ATE test equipment 01 includes a main control module 10 and a power supply module 20. The power supply control output terminal 12 of the main control module 10 is electrically connected to the power supply control receiving terminal 21 of the power supply module 20.

[0052] The fault protection circuit 30 includes a signal processing module 40 and a protection relay K1. The signal processing module 40 includes a signal input terminal 41 and a signal output terminal 42. The protection relay K1 includes a first connection terminal K13, a second connection terminal K14, and a first switch control terminal K11. Specifically, the signal input terminal 41 of the signal processing module 40 is connected to the first output terminal 11 of the main control module 10 to detect whether the main control module 10 is working properly; the signal output terminal 42 of the signal processing module 40 is coupled to the first switch control terminal K11 of the protection relay K1; the first connection terminal K13 of the protection relay K1 is connected to the power supply output terminal 22 of the power supply module 20, and the second connection terminal K14 of the protection relay K1 is connected to the unit under test. It should be noted that in this embodiment, the signal processing module 40 is coupled to the protection relay K1. In other embodiments, the signal processing module 40 can also be connected to the protection relay K1, depending on the type of protection relay K1, and no specific limitation is made.

[0053] In the ATE test equipment 01, the main control module 10 can be used to control the power supply module 20 to provide a certain range of voltage signals to the unit under test. The main control module 10 includes, but is not limited to, field-programmable gate array (FPGA) circuits, advanced RISC machines (ARM), microcontroller units (MCUs), microprocessor units (MPUs), and other control devices. The power supply module 20 includes, but is not limited to, voltage output modules such as high-voltage output modules, low-voltage output modules, and medium-voltage output modules. In addition, the power supply module 20 may also include a current output module; this embodiment of the present invention does not limit this.

[0054] The fault protection circuit 30 can receive the signal output from the first output terminal 11 of the main control module 10, and detect whether the main control module 10 is malfunctioning based on the signal output from the first output terminal 11, and control the connection between the power supply output terminal 22 of the power supply module 20 and the unit under test based on the detection result. The signal processing module 40 includes, but is not limited to, all circuits capable of processing signals and / or extracting signal feature points, such as signal processing circuits and signal feature extraction circuits. The signal output terminal 42 of the signal processing module 40 can be directly electrically connected to the first switch control terminal K11 of the protection relay K1 to control the on / off state of the protection relay K1; or, the signal output terminal 42 of the signal processing module 40 can also control the on / off state of the protection relay K1 through indirect signal transmission. This embodiment of the present invention does not limit the connection method between the signal output terminal 42 of the signal processing module 40 and the first switch control terminal K11 of the protection relay K1.

[0055] Specifically, the fault protection circuit 30 can be used to detect whether the main control module 10 is working properly and to provide fault protection for the unit under test based on the detection results. The signal processing module 40 in the fault protection circuit 30 can process and detect the signal output from the first output terminal 11 of the main control module 10. If the signal processing module 40 detects that the main control module 10 is working properly, the signal processing module 40 can output a first level signal to the first switch control terminal K11 of the protection relay K1, so that the protection relay K1 set between the power supply module 20 and the unit under test is turned on, and the power supply module 20 can provide an electrical signal to the unit under test. If the signal processing module 40 detects that the main control module 10 is malfunctioning, the signal processing module 40 can output a second level signal to the first switch control terminal K11, so that the protection relay K1 set between the power supply module 20 and the unit under test is turned off, and the power supply module 20 stops providing an electrical signal to the unit under test, so as to avoid the power supply module 20 providing an abnormal electrical signal to the unit under test due to the fault of the main control module 10, which could damage the unit under test.

[0056] For example, continue to refer to Figure 1 The power supply control output terminal 12 of the main control module 10 is electrically connected to the power supply control receiving terminal 21 of the power supply module 20. The power supply output terminal 22 of the power supply module 20 is electrically connected to the first connection terminal K13 of the protection relay K1, and the second connection terminal K14 of the protection relay K1 is electrically connected to the unit under test. The first output terminal 11 of the main control module 10 is electrically connected to the signal input terminal 41 of the signal processing module 40 in the abnormal protection circuit 30, and the signal output terminal 42 of the signal processing module 40 is electrically connected to the first switch control terminal K11 of the protection relay K1.

[0057] During testing, the main control module 10 may experience significant voltage spikes, generating substantial electromagnetic interference. This can lead to a series of problems, such as system crashes, functional abnormalities, signal distortion, and logic errors. Consequently, the electrical signal output from the power supply output terminal 22 of the power supply module 20 may become abnormal, no longer conforming to the intended signal. For example, after the main control module 10 malfunctions, the first output terminal 11 may output a high-voltage signal, a high-frequency signal with very frequent transitions, or a signal with a consistently low voltage value. When the main control module 10 is operating normally, the first output terminal 11 should output a signal with a normal transition frequency (neither too high nor too low) and a moderate voltage value.

[0058] The signal processing module 40 in the abnormal protection circuit 30 can receive and detect the electrical signal output from the first output terminal 11 of the main control module 10. For example, the signal processing module 40 can detect the maximum voltage value, switching frequency and other characteristic information of the first output terminal 11. When the characteristic information of the first output terminal 11 is within the reference range, it can be determined that the signal of the first output terminal 11 is normal, that is, the main control module 10 is working normally. When the characteristic information of the first output terminal 11 is not within the reference range, it can be determined that the signal of the first output terminal 11 is abnormal, that is, the main control module 10 is not working normally. The reference range can be set according to actual needs, such as test precision and accuracy. When the electrical signal received by the signal input terminal 41 of the signal processing module 40 from the first output terminal 11 is normal, the signal output terminal 42 of the signal processing module 40 can output a first level signal, which energizes the coil of the protection relay K1 and turns on the contact switch of the protection relay K1, that is, the first connection terminal K13 and the second connection terminal K14 are connected, so that the power supply module 20 and the unit under test are connected. When the main control module 10 is working normally, the unit under test can receive the electrical signal provided by the power supply module 20.

[0059] When the electrical signal received by the signal input terminal 41 of the signal processing module 40 from the first output terminal 11 is abnormal, the signal output terminal 42 of the signal processing module 40 can output a second level signal to de-energize the coil of the protection relay K1 and close the contact switch of the protection relay K1. This interrupts the connection between the power supply module 20 and the unit under test when the main control module 10 malfunctions and causes the power supply module 20 to output an abnormal electrical signal to the unit under test, thus preventing the unit under test from receiving the abnormal electrical signal and causing damage to the unit under test.

[0060] When the electrical signal received by the signal input terminal 41 of the signal processing module 40 from the first output terminal 11 returns to normal, the signal output terminal 42 of the signal processing module 40 can resume outputting the first level signal, energizing the coil of the protection relay K1, and opening the contact switch of the protection relay K1. The unit under test can then receive the electrical signal provided by the power supply module 20 and continue testing, thereby improving testing efficiency.

[0061] It is understood that the first level signal can be either a high-level signal or a low-level signal. The goal is to ensure that when the first switch control terminal K11 receives the first level signal, the coil of the protection relay K1 is energized, and the contact switch of the protection relay K1 is closed. This embodiment does not specifically limit the first level signal. The second level signal is different from the first level signal. For example, when the first level signal is high, the second level signal is low, or vice versa. A high-level signal corresponds to logic 1, representing a signal with a relatively high voltage range, such as 2.4V-5V; a low-level signal corresponds to logic 0, representing a signal with a relatively low voltage range, such as 0V-0.4V.

[0062] In one embodiment, the protective relay K1 further includes a second switch control terminal K12. The first switch control terminal K11 and the second switch control terminal K12 are electrically connected to the two ends of the coil of the protective relay K1, respectively. When the main control module 10 is working normally and the second switch control terminal K12 is grounded, the first level signal can be a high level signal to control the coil of the protective relay K1 to be energized. When the main control module 10 is working normally and the second switch control terminal K12 is connected to a high level signal, the first level signal can be a low level signal to control the coil of the protective relay K1 to be energized.

[0063] Based on the above implementation, the second switch control terminal K12 can be connected to the reference voltage terminal Vref. The signal of the reference voltage terminal Vref can be controlled by the main control module 10. The signal of the reference voltage terminal Vref can be a low-level signal, or the signal of the reference voltage terminal Vref can be a high-level signal.

[0064] The anomaly protection circuit provided in this embodiment includes a signal processing module. The signal input terminal of the signal processing module can be connected to the first output terminal of the main control module to receive the electrical signal output by the first output terminal to detect whether the main control module is abnormal. The anomaly protection circuit also includes a protection relay, which can be disposed between the power supply module and the unit under test. The signal output terminal of the signal processing module is electrically connected to the first switch control terminal of the protection relay. When the signal processing module detects that the main control module is normal, it can control the protection relay to conduct; when the signal processing module detects that the main control module is abnormal, it can control the protection relay to turn off, preventing the power supply module from providing abnormal electrical signals to the unit under test due to the main control module's abnormality, thus avoiding damage to the unit under test. The anomaly protection circuit provided in this embodiment can detect the electrical signal output by the main control module in real time and take immediate measures when the detected electrical signal output by the main control module exceeds a preset safety range to ensure the safety of the unit under test without affecting the normal testing process.

[0065] Optional, continue to refer to Figure 1 The signal output terminal 42 of the signal processing module 40 is also used for electrical connection with the feedback receiving terminal 13 of the main control module 10. For example, after the signal processing module 40 in the abnormal protection circuit 30 detects an abnormality in the main control module 10, it can feed back the electrical signal indicating the abnormality to the main control module 10. The main control module 10 can latch the abnormality and feed it back to the host computer through the communication terminal 14, wherein the host computer includes, but is not limited to, a computer, an industrial control computer, and other devices.

[0066] Optional, Figure 2 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 2 ,refer to Figure 2 The abnormal protection circuit 30 also includes a power supply control switch K2, which is connected in series between the power supply control output terminal 12 of the main control module 10 and the power supply control receiving terminal 21 of the power supply module 20. The control terminal K23 of the power supply control switch K2 is electrically connected to the signal output terminal 42 of the signal processing module 40.

[0067] Among them, the power supply control switch K2 includes, but is not limited to, switching devices such as transistors and relays.

[0068] For example, after the signal processing module 40 in the abnormal protection circuit 30 detects an abnormality in the main control module 10, it can directly output an electrical signal indicating the abnormality to the control terminal K23 of the power supply control switch K2, causing the power supply control switch K2 to turn off. This prevents the power supply module 20 from receiving signals from the main control module 10, thus avoiding the main control module 10 from outputting abnormal electrical signals to the power supply module 20, which could damage the power supply module 20 or cause the power supply module 20 to output abnormal electrical signals, posing a certain safety risk. At the same time, it can also prevent the main control module 10 from completely crashing, which would prevent the main control module 10 from controlling the power supply module 20 to stop supplying power according to the electrical signal received by the feedback receiving terminal 13 when it is abnormal, causing irreparable damage to the power supply module 20 and / or the unit under test.

[0069] It should be noted that the power supply control switch K2 has two control terminals. One control terminal is connected to the power supply control output terminal 12 of the main control module 10, and the other control terminal K23 is electrically connected to the signal output terminal 42 of the signal processing module 40. The power supply control switch K2 closes and the power supply module 20 provides power only when both the power supply control output terminal 12 and the signal output terminal 42 of the signal processing module 40 output normal signals. If either the power supply control output terminal 12 or the signal output terminal 42 of the signal processing module 40 outputs an abnormal signal, the power supply control switch K2 opens and the power supply module 20 does not provide power.

[0070] Optional, Figure 3This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 3 ,refer to Figure 3 The fault protection circuit 30 also includes an alarm module 50, which is electrically connected to the signal output terminal 42 of the signal processing module 40. In an optional embodiment, the alarm module 50 may include an alarm indicator light. Figure 3 (Not shown in the image), in another optional embodiment, the alarm module 50 may include a buzzer (…). Figure 3 (Not shown in the image).

[0071] For example, when the signal processing module 40 detects that the main control module 10 is working normally, the signal output terminal 42 of the signal processing module 40 can output a first level signal to control the alarm module 50 to not work; when the signal processing module 40 detects that the main control module 10 is malfunctioning, the signal processing module 40 can output a second level signal to control the alarm module 50 to work, so as to prompt relevant personnel that the main control module 10 has malfunctioned.

[0072] It is understandable that the first level signal can be either a high-level signal or a low-level signal. The second level signal is different from the first level signal, and it can ensure that when the first level signal is output at the signal output terminal 42, the contact switch of the protection relay K1 is turned on and the alarm module 50 is not working; when the second level signal is output at the signal output terminal 42, the contact switch of the protection relay K1 is turned off and the alarm module 50 is working. The alarm module 50 includes an alarm indicator light, which includes a light-emitting diode (LED). Figure 3 Taking (not shown in the image) as an example, when the first level signal is a high level signal and the second level signal is a low level signal, the signal output terminal 42 can be electrically connected to the cathode of the LED, and the anode of the LED can be connected to a power supply signal. When the signal output terminal 42 outputs a high-level first level signal, the LED does not emit light; when the signal output terminal 42 outputs a low-level second level signal, the LED emits light. When the first level signal is a low level signal and the second level signal is a high level signal, the signal output terminal 42 can be electrically connected to the anode of the LED, and the cathode of the LED can be grounded. When the signal output terminal 42 outputs a low-level first level signal, the LED does not emit light; when the signal output terminal 42 outputs a high-level second level signal, the LED emits light.

[0073] It should be noted that the alarm module 50 is not limited to alarm indicator lights and buzzers. Figure 3 (not shown in the figure), and may also include other devices or circuits that can realize fault indication. This embodiment does not limit the specific structure of the alarm module 50.

[0074] It should also be noted that the alarm module 50 is not limited to being electrically connected to the signal output terminal 42 of the signal processing module 40. As long as the alarm module 50 can indicate an abnormality, in other optional embodiments, it can also be coupled to the signal output terminal 42 of the signal processing module 40 through indirect signal transmission. This embodiment does not limit the specific connection position of the alarm module 50.

[0075] In an alternative embodiment, Figure 4 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 4 ,refer to Figure 4 The signal processing module 40 includes a low-pass filter LPF and a window comparator COMP. The input terminal of the low-pass filter LPF is electrically connected to the signal input terminal 41, the output terminal of the low-pass filter LPF is electrically connected to the input terminal of the window comparator COMP, and the output terminal of the window comparator COMP is electrically connected to the signal output terminal 42.

[0076] For example, when the main control module 10 is working normally, the electrical signal output by the first output terminal 11 can be a square wave signal with a fixed frequency. For example, the main control module 10 can control the high and low levels of the first output terminal 11 through the I / O pins, so that the first output terminal 11 outputs a square wave signal with a frequency of 10KHz, a duty cycle of 50%, and an amplitude of 3.3V. The high frequency components can be filtered out by the low-pass filter LPF, and the rectified DC signal can be output. For example, a DC signal of 1.65V can be output. The DC signal is compared with the reference voltages Vref1 and Vref2 of the window comparator COMP and the comparison result is output, which is the detection result. In an optional embodiment, the reference voltages Vref1 and Vref2 can be 1.2V and 2.2V, respectively.

[0077] Taking the example that the second switch control terminal K12 of the protection relay K1 receives a low-level signal, when the main control module 10 works normally, the low-pass filter LPF outputs a DC signal of 1.65V, Vref1 < 1.65 < Vref2, the window comparator COMP outputs a high-level signal, that is, the signal output terminal 42 of the signal processing module 40 outputs a high-level signal, so that the contact switch of the protection relay K1 conducts, and the被测单元 can receive the electrical signal of the power supply module 20; when the main control module 10 works abnormally, the logic resource is abnormal, the first output terminal 11 stops outputting a normal square wave signal, but outputs an abnormal long low or long high level signal, the low-pass filter LPF outputs a DC signal of 0V or 3.3V, and the electrical signal output by the low-pass filter LPF is not within the range of the reference voltages Vref1 and Vref2, the window comparator COMP outputs a low-level signal, that is, the signal output terminal 42 of the signal processing module 40 outputs a low-level signal, so that the contact switch of the protection relay K1 is turned off, and the被测单元 no longer receives the electrical signal of the power supply module 20; after the interference is eliminated and the main control module 10 resumes normal operation, the first output terminal 11 resumes outputting a normal square wave signal, the low-pass filter LPF can continue to output a DC signal of 1.65V, the window comparator COMP and the signal output terminal 42 of the signal processing module 40 continue to output high-level signals, so that the contact switch of the protection relay K1 conducts, and the被测单元 can continue to receive the electrical signal of the power supply module 20 for testing.

[0078] In this way, the signal processing module 40 in the abnormal protection circuit 30 can receive and detect the signal of the first output terminal 11, and output a signal of a corresponding level to the first switch control terminal K11 of the protection relay K1, so as to control the protection relay K1 to conduct when the main control module 10 is normal, and control the protection relay K1 to turn off when the main control module 10 is abnormal.

[0079] Exemplarily, taking the example that the second switch control terminal K12 of the protection relay K1 receives a low-level signal, continue to refer to Figure 4 , the alarm module 50 may include an alarm indicator D1. The anode of the alarm indicator D1 may be connected to the first auxiliary power supply terminal VCC, and the cathode may be connected to the signal output terminal 42 of the signal processing module 40. When the main control module 10 works normally, the signal output terminal 42 of the signal processing module 40 outputs a high-level signal, the contact switch of the protection relay K1 conducts, and at the same time the alarm indicator D1 is not lit; when the main control module 10 works abnormally, the signal output terminal 42 of the signal processing module 40 outputs a low-level signal, the contact switch of the protection relay K1 is turned off, and at the same time the alarm indicator D1 is lit to prompt the relevant staff that the main control module 10 has an abnormality.

[0080] Note: There is an unclear term "被测单元" in the original text which is translated as "被测单元" in the English version as the specific meaning is not clear. It may need to be further determined according to the actual context.It should be noted that the alarm module 50 also includes a current-limiting resistor, which is connected in series with the alarm indicator D1 to make the current of the alarm indicator D1 controllable; it can also provide voltage limiting protection for the alarm indicator D1.

[0081] In yet another alternative embodiment, Figure 5 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 5 ,refer to Figure 5 The signal processing module 40 includes an integrator INT and a window comparator COMP. The input terminal of the integrator INT is electrically connected to the signal input terminal 41, the output terminal of the integrator INT is electrically connected to the input terminal of the window comparator COMP, and the output terminal of the window comparator COMP is electrically connected to the signal output terminal 42.

[0082] For example, when the main control module 10 is working normally, the electrical signal output by the first output terminal 11 is a square wave signal of fixed frequency. After passing through the integrator INT, it can output a DC signal. The window comparator COMP compares this DC signal with the reference voltages Vref1 and Vref2 and outputs the comparison result, which is the detection result. Taking the second switch control terminal K12 of the protection relay K1 receiving a low-level signal as an example, when the main control module 10 is working normally, the window comparator COMP and the signal output terminal 42 of the signal processing module 40 output a high-level signal to make the contact switch of the protection relay K1 conduct; when the main control module 10 is malfunctioning, it generates an abnormal long low or long high level signal, and the window comparator COMP and the signal processing module 40 output a low-level signal to make the contact switch of the protection relay K1 turn off; after the interference is eliminated and the main control module 10 returns to normal, the signal output terminal 42 of the window comparator COMP and the signal processing module 40 continues to output a high-level signal to make the contact switch of the protection relay K1 conduct, and the unit under test can continue to receive the electrical signal from the power supply module 20 for testing. Thus, the signal processing module 40 in the abnormal protection circuit 30 can control the protection relay K1 to turn on when the main control module 10 is normal, and control the protection relay K1 to turn off when the main control module 10 is abnormal.

[0083] In yet another alternative embodiment, Figure 6 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 6 ,refer to Figure 6 The signal processing module 40 includes a Fourier transform FT, the input terminal of the Fourier transform FT is electrically connected to the signal input terminal 41, and the output terminal of the Fourier transform FT is electrically connected to the signal output terminal 42.

[0084] For example, when the main control module 10 is working normally, the electrical signal output by the first output terminal 11 is a square wave signal with a fixed frequency. The minimum frequency, maximum amplitude and other feature information can be extracted by the Fourier transform (FT). The extracted feature information is compared with the set parameters and the comparison result is output, which is the detection result. Taking the second switch control terminal K12 of the protection relay K1 receiving a low-level signal as an example, when the main control module 10 is working normally, the characteristic signal extracted after the square wave signal output by the first output terminal 11 is within the set parameter range after Fourier transformation, indicating that the electrical signal output by the first output terminal 11 of the main control module 10 is normal. The Fourier transformer FT can output a high-level signal to make the contact switch of the protection relay K1 conduct. When the main control module 10 is malfunctioning, the first output terminal 11 outputs an abnormal electrical signal. The characteristic signal extracted after the square wave signal output by the first output terminal 11 is not within the set parameter range, indicating that the electrical signal output by the first output terminal 11 of the main control module 10 is abnormal. The Fourier transformer FT can output a low-level signal to make the contact switch of the protection relay K1 turn off. After the interference is eliminated and the main control module 10 returns to normal, the Fourier transformer FT outputs a high-level signal to make the contact switch of the protection relay K1 conduct, and the unit under test can continue to receive the electrical signal from the power supply module 20 for testing. Thus, when the main control module 10 is normal, the signal processing module 40 in the abnormal protection circuit 30 can control the protection relay K1 to be turned on, so that the unit under test can receive the normal electrical signal from the power supply module 20. When the main control module 10 is abnormal, the protection relay K1 is turned off, so that the unit under test cannot receive the abnormal electrical signal from the power supply module 20, thereby protecting the unit under test from damage.

[0085] It should be noted that the signals output from the first output terminal 11 of the main control module 10 include, but are not limited to, periodically changing signals such as square waves, sine waves, triangular waves, and sawtooth waves. Furthermore, the signals output from the first output terminal 11 of the main control module 10 can also include fixed-frequency signals, variable-frequency signals, and signals with fixed potentials (which can be achieved by setting a digital-to-analog converter in the main control module 10). When the signal output from the first output terminal 11 of the main control module 10 is a signal with a fixed potential, the signal processing module 40 may only include a window comparator COMP, eliminating the need for processors for non-fixed-potential signals such as a low-pass filter LPF, an integrator INT, and a Fourier transform FT.

[0086] Optional, Figure 7 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 7 ,refer to Figure 7The abnormal protection circuit 30 also includes an auxiliary control module 60, which includes an auxiliary control input terminal 61 and an auxiliary control output terminal 62. The signal output terminal 42 of the signal processing module 40 is electrically connected to the auxiliary control input terminal 61 of the auxiliary control module 60, and the auxiliary control output terminal 62 of the auxiliary control module 60 is electrically connected to the first switch control terminal K11 of the protection relay K1.

[0087] The auxiliary control module 60 includes all the circuits that can realize the switching control function.

[0088] Specifically, the signal processing module 40 processes and detects the signal output from the first output terminal 11 of the main control module 10, and the auxiliary control module 60 converts the detection result output by the signal processing module 40 into a control signal to control the on / off state of the protection relay K1. Thus, controlling the protection relay K1 through the auxiliary control module 60 facilitates electrical isolation, protects the stability and safety of the circuit, and avoids mutual interference between circuits. In an optional embodiment, the signal output terminal 42 of the signal processing module 40 can be directly connected to the feedback receiving terminal 13 of the main control module 10, or the signal output terminal 42 of the signal processing module 40 can be indirectly connected to the feedback receiving terminal 13 of the main control module 10 through the auxiliary control module 60, so that the abnormal protection circuit 30 can provide feedback on the operating status of the main control module 10, whereby the operating status of the main control module 10 includes normal operation and abnormal operation.

[0089] For example, the signal output from the first output terminal 11 of the main control module 10 is processed by the signal processing module 40 and the processing result is transmitted to the auxiliary control module 60. When the ATE test equipment 01 is interfered with, the signal output from the first output terminal 11 of the main control module 10 changes. After detecting the abnormality, the signal processing module 40 outputs a second-level signal to the auxiliary control module 60, causing the auxiliary control module 60 to control the protection relay K1 to interrupt the connection between the power supply module 20 and the unit under test, thus protecting the unit under test. When the interference is eliminated and the signal output from the first output terminal 11 of the main control module 10 returns to normal, the signal processing module 40 outputs a first-level signal to the auxiliary control module 60, causing the auxiliary control module 60 to control the protection relay K1 to reconnect the connection between the power supply module 20 and the unit under test, and continue the test. Controlling the protection relay K1 through the auxiliary control module 60 is beneficial for achieving electrical isolation and protecting the stability and safety of the circuit.

[0090] In an optional embodiment, the signal at the signal output terminal 42 of the signal processing module 40 and the signal at the auxiliary control output terminal 62 of the auxiliary control module 60 are both within the same voltage range, that is, the signal at the signal output terminal 42 and the signal at the auxiliary control output terminal 62 can be high-level signals or low-level signals at the same time.

[0091] In other alternative embodiments, the signal at the signal output terminal 42 of the signal processing module 40 and the signal at the auxiliary control output terminal 62 of the auxiliary control module 60 can also be in different voltage ranges, that is, one of the signals at the signal output terminal 42 and the auxiliary control output terminal 62 is a high-level signal and the other is a low-level signal. This embodiment of the present invention does not limit the signals at the signal output terminal 42 and the auxiliary control output terminal 62, and can control the protection relay K1 to turn off when the main control module 10 is abnormal.

[0092] It should be noted that high-level signals and low-level signals correspond to different logic and can correspond to different voltage ranges, not specific voltage levels. For example, signals with voltage values ​​in the range of 0V-0.4V are all low-level signals, and signals with voltage values ​​in the range of 2.4V-5V are all high-level signals. When the signal at signal output terminal 42 and the signal at auxiliary control output terminal 62 are both high-level signals or both low-level signals, the signal at signal output terminal 42 and the signal at auxiliary control output terminal 62 can have different voltage values.

[0093] In an alternative embodiment, Figure 8 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 8 ,refer to Figure 8 The auxiliary control module 60 includes an optocoupler disconnect switch U1 and an auxiliary switch Q1. The auxiliary control terminal of the auxiliary switch Q1 is electrically connected to the auxiliary control input terminal 61; the auxiliary switch Q1 is connected in series with the light-emitting diode in the optocoupler disconnect switch U1; the photosensitive switch in the optocoupler disconnect switch U1 is electrically connected to the auxiliary control output terminal 62.

[0094] For example, the auxiliary switch Q1 is an NPN transistor. Its base is electrically connected to the auxiliary control input terminal 61 through the second resistor R2. The auxiliary control input terminal 61 is also electrically connected to the first auxiliary power supply terminal VCC through the first resistor R1. Its emitter is grounded. Its collector is electrically connected to the cathode of the light-emitting diode in the optocoupler isolation switch U1. The anode of the light-emitting diode in the optocoupler isolation switch U1 is electrically connected to the first auxiliary power supply terminal VCC through the third resistor R3. The first terminal of the photosensitive switch in the optocoupler isolation switch U1 is electrically connected to the second auxiliary power supply terminal VCC1. The second terminal of the photosensitive switch in the optocoupler isolation switch U1 is electrically connected to the auxiliary control output terminal 62. The second terminal of the photosensitive switch in the optocoupler isolation switch U1 is also grounded through the fourth resistor R4.

[0095] Taking the second switch control terminal K12 of the protection relay K1 receiving a low-level signal as an example, when the main control module 10 is working normally, the signal processing module 40 can output a high-level signal, the auxiliary switch Q1 is turned on, the light-emitting diode in the optocoupler isolation switch U1 emits light, causing the photosensitive switch in the optocoupler isolation switch U1 to turn on, outputting a high-level signal to the first switch control terminal K11 of the protection relay K1, energizing the coil of the protection relay K1, causing the contact switch of the protection relay K1 to turn on, thereby enabling the power supply module 20 to supply power to the unit under test normally; when the main control module 10 is malfunctioning, the signal processing module 40 outputs a low-level signal, the auxiliary switch Q1 is turned off, the light-emitting diode in the optocoupler isolation switch U1 does not emit light, causing the photosensitive switch in the optocoupler isolation switch U1 to turn off, outputting a low-level signal to the first switch control terminal K11 of the protection relay K1, the coil of the protection relay K1 is not energized, the contact switch of the protection relay K1 is turned off, so that the unit under test will not receive abnormal electrical signals.

[0096] It is understandable that the auxiliary switch Q1 can also be a PNP transistor, an N-type MOSFET, a P-type MOSFET, or other switching devices, with similar working principles, which will not be explained in detail here.

[0097] In one embodiment, the auxiliary switch Q1 and the fourth resistor R4 are grounded separately, meaning that the auxiliary switch Q1 and the fourth resistor R4 are not connected and do not share a ground wire. This creates electrical isolation between the auxiliary switch Q1 and the fourth resistor R4, which is beneficial for surge protection and leakage protection, and reduces loop signal interference.

[0098] In yet another alternative embodiment, Figure 9 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 9 ,refer to Figure 9 The signal processing module 40 electrically connected to the auxiliary control module 60 is not limited to a low-pass filter LPF and a window comparator COMP. The signal processing module 40 electrically connected to the auxiliary control module 60 may also include a Fourier transform FT. This embodiment of the invention does not specifically limit the signal processing module 40 electrically connected to the auxiliary control module 60.

[0099] In addition, a power supply control module K2 can be set between the main control module 10 and the power supply module 20 according to actual needs, or the power supply control module K2 can be not set. In this embodiment of the invention, when the auxiliary control module 60 is electrically connected to the signal processing module 40, there is no limitation on whether the power supply control module K2 is set between the main control module 10 and the power supply module 20.

[0100] Understandable, Figure 8 and Figure 9This example only illustrates one specific connection method of the auxiliary control module 60, including the optocoupler isolation switch U1 and the auxiliary switch Q1, but it is not limited to this. In other optional embodiments, the auxiliary switch Q1 can also be a switching device such as a PNP transistor or a MOSFET. The auxiliary switch Q1 can also be electrically connected to the anode of the light-emitting diode in the optocoupler isolation switch U1. As long as the feature information extracted from the first output terminal 11 of the main control module 10 exceeds the normal range, it can control the protection relay K1 to turn off. This embodiment does not limit the specific connection method of the optocoupler isolation switch U1 and the auxiliary switch Q1 in the auxiliary control module 60.

[0101] In yet another alternative embodiment, Figure 10 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 10 ,refer to Figure 10 The auxiliary control module 60 includes an isolation relay K3, the coil of which is electrically connected to the auxiliary control input terminal 61, and the contact switch of which is electrically connected to the auxiliary control output terminal 62.

[0102] For example, one end of the coil in the isolation relay K3 is electrically connected to the auxiliary control input terminal 61, and the other end is grounded to GND; one end of the contact switch in the isolation relay K3 is electrically connected to the second auxiliary power supply terminal VCC1, and the other end is electrically connected to the auxiliary control output terminal 62.

[0103] Taking the second switch control terminal K12 of the protection relay K1 receiving a low-level signal as an example, when the main control module 10 is working normally, the signal processing module 40 can output a high-level signal, the coil of the isolation relay K3 is energized, the contact switch of the isolation relay K3 is turned on, which also energizes the coil of the protection relay K1, turns on the contact switch of the protection relay K1, and the power supply module 20 normally supplies power to the unit under test; when the main control module 10 is malfunctioning, the signal processing module 40 can output a low-level signal, the coil of the isolation relay K3 is not energized, the contact switch of the isolation relay K3 is turned off, which also energizes the coil of the protection relay K1, turns off the contact switch of the protection relay K1, and the unit under test will not receive abnormal electrical signals.

[0104] It is understandable that when the power supply module 20 is a high-voltage output module or a high-current output module, the auxiliary control module 60 can effectively isolate voltage spikes or current spikes, protecting the main control module 10. When the power supply module 20 is a low-voltage output module or a low-current output module, only the signal processing module 40 needs to be set, and the auxiliary control module 60 is not required. Of course, the auxiliary control module 60 can be set or not set according to actual needs or safety considerations. This embodiment of the invention does not make specific limitations on whether or not the auxiliary control module 60 is set.

[0105] Based on the same concept, this utility model embodiment also provides an ATE testing system. (See reference) Figure 1 The ATE test system includes ATE test equipment 01, and the abnormal protection circuit 30 provided in any embodiment of the present invention, as well as a host computer, etc., as detailed in the following embodiments.

[0106] The ATE test equipment 01 includes a main control module 10 and a power supply module 20. The main control module 10 includes a power supply control output terminal 12 and a first output terminal 11. The power supply module 20 includes a power supply control receiver terminal 21 and a power supply output terminal 22. The power supply control output terminal 12 of the main control module 10 is electrically connected to the power supply control receiver terminal 21 of the power supply module 20. The power supply output terminal 22 of the power supply module 20 is electrically connected to the first connection terminal K13 of the protection relay K1. The second connection terminal K14 of the protection relay K1 is used to connect the unit under test. The first output terminal 11 of the main control module 10 is electrically connected to the signal input terminal 41 of the signal processing module 40 in the abnormal protection circuit 30. The signal output terminal 42 of the signal processing module 40 is electrically connected to the first switch control terminal K11 of the protection relay K1.

[0107] It is understandable that the main control module 10 may also include ports such as a main control power supply terminal and a main control ground terminal. Figure 1 (Not shown in the image); the power supply module 20 may also include ports such as a power supply terminal and a power supply grounding terminal. Figure 1 (Not shown in the image), these ports are not related to the inventive point of this application and will not be described one by one.

[0108] It is also understood that the first output terminal 11 can output characteristic signals, including but not limited to square wave signals, fixed-potential signals, fixed-frequency signals, variable-frequency signals, and other electrical signals. In an optional embodiment, the power supply control output terminal 12 can be reused as the first output terminal 11. In yet another optional embodiment, the main control module 10 includes a clock oscillator, the output of which can be electrically connected to the first output terminal 11. Figure 1 (Not shown in the image).

[0109] The ATE testing system provided in this embodiment of the invention electrically connects the signal input terminal of the signal processing module in the anomaly protection circuit to the first output terminal of the main control module, receiving the electrical signal output from the first output terminal to detect whether the main control module is malfunctioning. Furthermore, by electrically connecting the signal output terminal of the signal processing module in the anomaly protection circuit to the first switch control terminal of the protection relay, the protection relay can be activated when the main control module is detected to be normal, and deactivated when an anomaly is detected. This prevents the main control module in the ATE testing equipment from malfunctioning during testing, which could lead to the power supply module providing abnormal electrical signals to the unit under test (DUT) and damaging the DUT. The ATE testing system provided in this embodiment of the invention can detect the electrical signals output by the main control module in real time and immediately take measures to ensure the safety of the DUT when an abnormal signal exceeding a preset safety range is detected, without affecting the normal testing process.

[0110] Optional, continue to refer to Figure 1 The main control module 10 also includes a feedback receiver 13, which is electrically connected to the signal output terminal 42 of the signal processing module 40. The main control module 10 is used to control the power supply module 20 according to the signal received by the feedback receiver 13.

[0111] For example, the main control module 10 can control the power supply module 20 based on the electrical signal received by the feedback receiving terminal 13. For instance, when the signal processing module 40 in the abnormal protection circuit 30 feeds back an electrical signal indicating an abnormality in the main control module 10 to the feedback receiving terminal 13, the main control module 10 can control the power supply module 20 to stop supplying power to the unit under test. Conversely, when the signal processing module 40 in the abnormal protection circuit 30 feeds back an electrical signal indicating a normal operation in the main control module 10 to the feedback receiving terminal 13, the main control module 10 can control the power supply module 20 to supply power to the unit under test. In this way, the main control module 10 can promptly control the power supply module 20 to stop operating when it malfunctions, and can control the power supply module 20 to stop supplying power before it outputs an abnormal electrical signal, thus preventing the power supply module 20 from outputting an abnormal electrical signal or preventing the unit under test from receiving an abnormal electrical signal. This provides safer and more effective protection for the ATE test equipment 01 and the unit under test.

[0112] Based on the above embodiments, refer to Figure 2 The abnormal protection circuit 30 may also include a power supply control switch K2. The power supply control switch K2 may be set between the power supply control output terminal 12 of the main control module 10 and the power supply control receiving terminal 21 of the power supply module 20. The control terminal of the power supply control switch K2 may be electrically connected to the signal output terminal 42 of the signal processing module 40.

[0113] For example, when the abnormal protection circuit 30 feeds back an abnormal electrical signal to the main control module 10, the power supply control switch K2 can interrupt the connection between the main control module 10 and the power supply module 20 according to the electrical signal output by the signal output terminal 42 of the signal processing module 40 indicating that the main control module 10 is abnormal, so as to stop the power supply module 20 from working, so as to avoid the main control module 10 being completely unable to work when it is abnormal, and the power supply module 20 being unable to control to stop supplying power to the unit under test.

[0114] Optional, continue to refer to Figure 1 and Figure 2 The main control module 10 also includes a communication terminal 14 and a memory. Figure 1 and Figure 2 (Not shown in the image), the memory is electrically connected to the feedback receiver 13 and the communication terminal 14 respectively. Figure 1 and Figure 2 (Not shown in the image), the communication terminal 14 is used to connect to the host computer of the main control module 10.

[0115] For example, the main control module 10 can receive the electrical signal fed back by the abnormal protection circuit 30 through the feedback receiver 13, latch the abnormal situation through the memory (not shown in the figure), and after the main control module 10 returns to normal, it can feed back the abnormal situation to the host computer through the communication terminal 14. For example, the host computer can display information such as the fault time and fault location to remind the staff to perform fault maintenance or fault repair. The host computer includes, but is not limited to, devices such as computers and industrial control computers.

[0116] Based on the above embodiments, the memory of the main control module 10 ( Figure 1 (Not shown in the image) The main control module 10 can also store the initialization state, the setting state before the abnormality, or other states. For example, after the interference is eliminated and the main control module 10 returns to normal, the abnormality protection circuit 30 feeds back an electrical signal to the main control module 10 indicating that the main control module 10 is normal. The main control module 10 can enter the corresponding state after an abnormality occurs and it returns to normal, according to its internal configuration, to protect the ATE test equipment 01 or to allow the ATE test equipment 01 to continue testing. For example, after an abnormality occurs and it returns to normal, the main control module 10 can enter the test state before the abnormality and send the abnormality information to the host computer; or it can enter the test pause state, control the power supply module 20 to stop supplying power to the unit under test, and send the abnormality information to the host computer. After the staff performs fault maintenance or fault repair and confirms that there is no fault, the main control module 10 can be put into the test state by operating the host computer.

[0117] Optional, Figure 11 This is a schematic diagram of the structure of an anomaly protection circuit and an ATE test device provided in an embodiment of this utility model. Figure 10 1. Reference Figure 11The ATE test system also includes a relay driver 70, and the main control module 10 also includes a second output terminal 15 and a communication decryption circuit. Figure 11 (Not shown in the image); the protection relay K1 also includes a second switch control terminal K12. The communication terminal 14 can also be electrically connected to the input terminal of the communication decryption circuit, and the output terminal of the communication decryption circuit is electrically connected to the second output terminal 15. Figure 11 (not shown in the image); the second output terminal 15 is also electrically connected to the drive control terminal 71 of the relay driver 70, and the drive output terminal 72 of the relay driver 70 is electrically connected to the second switch control terminal K12 of the protection relay K1.

[0118] For example, real-time encryption information can be added to the communication protocol between the main control module 10 and the host computer. After receiving the encryption signal through the communication terminal 14, the main control module 10 decrypts the encryption signal in real time. When there is an abnormality on the host computer side, encryption fails, causing the communication decryption circuit of the main control module 10 to fail to decrypt. The main control module 10 can control the electrical signal output by the second output terminal 15 according to the signal output by the output terminal of the communication decryption circuit, so that the relay driver 70 drives the protection relay K1 to disconnect, thus protecting the unit under test in time and preventing the power supply module 20 from outputting abnormal electrical signals to the unit under test due to the abnormality of the host computer, which could damage the unit under test. At the same time, when the communication decryption circuit of the main control module 10 fails to decrypt, the main control module 10 can control the electrical signal output by the power supply control output terminal 12 according to the signal output by the output terminal of the communication decryption circuit, so that the power supply module 20 stops outputting electrical signals, thus protecting the power supply module 20 and the unit under test.

[0119] It is understandable that the relay driver 70 may also include ports such as a main control power supply terminal and a main control ground terminal. Figure 11 (Not shown in the image), these ports are not related to the inventive point of this application and will not be described one by one.

[0120] The ATE testing system provided in this embodiment includes the abnormal protection circuit provided in any embodiment of this utility model, and has the corresponding technical features and beneficial effects of the abnormal protection circuit. For the contents not described in detail in the embodiments of the ATE testing system, please refer to the description of the abnormal protection circuit above, and will not be repeated here.

[0121] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An anomaly protection circuit, characterized by, The fault protection circuit is applied to the ATE test equipment; the ATE test equipment includes a main control module and a power supply module, and the power supply control output terminal of the main control module is electrically connected to the power supply control receiving terminal of the power supply module. The fault protection circuit includes a signal processing module and a protection relay; the signal processing module includes a signal input terminal and a signal output terminal; the protection relay includes a first connection terminal, a second connection terminal and a first switch control terminal. The signal input terminal of the signal processing module is used to connect to the first output terminal of the main control module to detect whether the main control module is working properly; the signal output terminal of the signal processing module is coupled to the first switch control terminal of the protection relay; the first connection terminal of the protection relay is used to connect to the power supply output terminal of the power supply module, and the second connection terminal of the protection relay is used to connect to the unit under test.

2. The anomaly protection circuit of claim 1, wherein, The fault protection circuit also includes a power supply control switch; The power supply control switch is used to be connected in series between the power supply control output terminal of the main control module and the power supply control receiving terminal of the power supply module; the control terminal of the power supply control switch is electrically connected to the signal output terminal of the signal processing module.

3. The anomaly protection circuit of claim 1, wherein, The signal processing module includes a low-pass filter and a window comparator; The input terminal of the low-pass filter is electrically connected to the signal input terminal, the output terminal of the low-pass filter is electrically connected to the input terminal of the window comparator, and the output terminal of the window comparator is electrically connected to the signal output terminal.

4. The anomaly protection circuit of claim 1, wherein, The signal processing module includes an integrator and a window comparator; The input terminal of the integrator is electrically connected to the signal input terminal, the output terminal of the integrator is electrically connected to the input terminal of the window comparator, and the output terminal of the window comparator is electrically connected to the signal output terminal.

5. The anomaly protection circuit of claim 1, wherein, The signal processing module includes a Fourier transform; The input terminal of the Fourier transform is electrically connected to the signal input terminal, and the output terminal of the Fourier transform is electrically connected to the signal output terminal.

6. The anomaly protection circuit of claim 1, wherein, The fault protection circuit also includes an auxiliary control module; The auxiliary control module includes an auxiliary control input terminal and an auxiliary control output terminal; the auxiliary control input terminal of the auxiliary control module is electrically connected to the signal output terminal of the signal processing module, and the auxiliary control output terminal of the auxiliary control module is electrically connected to the first switch control terminal of the protection relay. The auxiliary control module includes an optocoupler isolation switch and an auxiliary switch; The auxiliary control terminal of the auxiliary switch is electrically connected to the auxiliary control input terminal; the auxiliary switch is connected in series with the light-emitting diode in the optocoupler isolation switch; the photosensitive switch in the optocoupler isolation switch is electrically connected to the auxiliary control output terminal.

7. The anomaly protection circuit of claim 1, wherein, The fault protection circuit also includes an auxiliary control module; The auxiliary control module includes an auxiliary control input terminal and an auxiliary control output terminal; the auxiliary control input terminal of the auxiliary control module is electrically connected to the signal output terminal of the signal processing module, and the auxiliary control output terminal of the auxiliary control module is electrically connected to the first switch control terminal of the protection relay. The auxiliary control module includes an isolation relay; The coil in the isolation relay is electrically connected to the auxiliary control input terminal, and the contact switch in the isolation relay is electrically connected to the auxiliary control output terminal.

8. An ATE testing system, characterized in that, include: ATE testing equipment and the fault protection circuit according to any one of claims 1-7; The ATE test equipment includes a main control module and a power supply module; the main control module includes a power supply control output terminal and a first output terminal; the power supply module includes a power supply control receiver terminal and a power supply output terminal. The power supply control output terminal of the main control module is electrically connected to the power supply control receiving terminal of the power supply module; the power supply output terminal of the power supply module is electrically connected to the first connection terminal of the protection relay, and the second connection terminal of the protection relay is used to connect to the unit under test. The first output terminal of the main control module is electrically connected to the signal input terminal of the signal processing module, and the signal output terminal of the signal processing module is coupled to the first switch control terminal of the protection relay.

9. The ATE test system of claim 8, wherein, The main control module also includes a feedback receiver; The feedback receiving end of the main control module is electrically connected to the signal output end of the signal processing module; The main control module is used to control the power supply module based on the signal received by the feedback receiver.

10. The ATE test system of claim 9, wherein, The ATE test system also includes a relay driver; the main control module also includes a communication terminal, a second output terminal, and a communication decryption circuit; the protection relay also includes a second switch control terminal. The communication terminal is used to connect to the host computer of the main control module. The communication terminal is also electrically connected to the input terminal of the communication decryption circuit. The output terminal of the communication decryption circuit is electrically connected to the second output terminal. The second output terminal is also electrically connected to the drive control terminal of the relay driver. The drive output terminal of the relay driver is electrically connected to the second switch control terminal of the protection relay.

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