Anomaly detection circuit and anomaly detection method of DCDC chip

Abstract

The application discloses an abnormality detection circuit and method of a DCDC chip, comprising a sampling module, a load module, a comparison module and a decision module; the sampling module is connected with the output end of the load module and the DCDC chip, collects the inductance current flowing through the inductor of the DCDC chip, converts the inductance current into a corresponding first voltage and then outputs the first voltage to the comparison module; the comparison module is also connected with the decision module, the comparison module outputs a second voltage to the decision module in response to the size relationship between the first voltage and a first preset reference voltage; the decision module extracts the direct current voltage corresponding to the second voltage, and determines whether the output of the DCDC chip is abnormal in response to the size relationship between the direct current voltage and a second preset reference voltage. In this way, whether the output of the DCDC chip is abnormal can be determined without storing a large amount of data.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and more particularly to an anomaly detection circuit and anomaly detection method for a DC-DC chip. Background Technology

[0002] When a DC-DC chip experiences loop instability or malfunctions in its current-limiting circuitry, an abnormal output state will occur. In this state, the actual ripple characteristics of the inductor current within the DC-DC chip may manifest as increased output ripple, failing to meet application requirements. Conventional testing of DC-DC chips typically uses an oscilloscope or an ADC (Analog-to-Digital Converter) to directly sample and observe the actual characteristics of the inductor current. However, this method requires storing large amounts of data, making it difficult to implement in mass production.

[0003] Therefore, how to detect anomalies in the output of DC-DC chips without storing large amounts of data has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] This invention provides an anomaly detection circuit and anomaly detection method for a DC-DC chip, which can realize the anomaly detection of the output of the DC-DC chip without storing a large amount of data.

[0005] In a first aspect, embodiments of the present invention provide an anomaly detection circuit for a DC-DC chip, comprising: a sampling module, a load module, a comparison module, and a decision module;

[0006] The DC-DC chip includes an inductor, and the load module is used to connect to the output terminal of the DC-DC chip;

[0007] The sampling module is connected to the inductor, the output terminal of the DC-DC chip, and the comparison module respectively. The sampling module is used to: in response to the connection of the load module to the output terminal of the DC-DC chip, collect the inductor current flowing through the inductor, and convert the inductor current into a corresponding first voltage and output it to the comparison module.

[0008] The comparison module is also connected to the decision module, and the comparison module is used to: output a second voltage to the decision module in response to the magnitude relationship between the first voltage and the first preset reference voltage;

[0009] The decision module is used to: extract the DC voltage corresponding to the second voltage, and determine whether the output of the DC-DC chip is abnormal in response to the relationship between the DC voltage and the second preset reference voltage.

[0010] Secondly, embodiments of the present invention provide a method for detecting anomalies in a DC-DC chip using the anomaly detection circuit described in the first aspect above, comprising:

[0011] The sampling module responds to the connection between the load module and the output terminal of the DC-DC chip, collects the inductor current flowing through the inductor of the DC-DC chip, and converts the inductor current into a corresponding first voltage and outputs it to the comparison module;

[0012] The comparison module responds to the magnitude relationship between the first voltage and the first preset reference voltage and outputs a second voltage to the decision module.

[0013] The decision module extracts the DC voltage corresponding to the second voltage and, in response to the relationship between the DC voltage and the second preset reference voltage, determines whether the output of the DCDC chip is abnormal.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention provides an anomaly detection circuit and method for a DC-DC chip, comprising: a sampling module, a load module, a comparison module, and a decision module. The DC-DC chip includes an inductor, and the load module is connected to the output terminal of the DC-DC chip. The sampling module is connected to the inductor, the output terminal of the DC-DC chip, and the comparison module. The sampling module is used to: in response to the connection of the load module to the output terminal of the DC-DC chip, collect the inductor current flowing through the inductor, convert the inductor current into a corresponding first voltage, and output it to the comparison module. The comparison module is also connected to the decision module, and is used to: in response to the relationship between the first voltage and a first preset reference voltage, output a second voltage to the decision module. The decision module is used to: extract the DC voltage corresponding to the second voltage, and in response to the relationship between the DC voltage and the second preset reference voltage, determine whether the output of the DC-DC chip is abnormal. Thus, through the cooperation of each module, only the data of the DC voltage and the second preset reference voltage need to be stored to determine whether the output of the DC-DC chip is abnormal. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an anomaly detection circuit provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of another anomaly detection circuit provided in an embodiment of the present invention;

[0018] Figure 3 This is a flowchart of an anomaly detection method provided in an embodiment of the present invention;

[0019] Figure 4 This is a flowchart of a self-testing process provided in an embodiment of the present invention;

[0020] Figure 5 This is a flowchart of an anomaly detection process provided in an embodiment of the present invention. Detailed Implementation

[0021] The following detailed description, with reference to the accompanying drawings, outlines a specific implementation of an anomaly detection circuit and method for a DC-DC chip provided by the present invention. It should be noted that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] This invention provides an anomaly detection circuit for a DC-DC chip, such as... Figure 1 As shown, it includes: sampling module 100, load module 200, comparison module 300, and decision module 400;

[0023] The DC-DC chip X10 includes an inductor L, and a load module 200 is used to connect to the output terminal A of the DC-DC chip X10; wherein, the load module 200 is also connected to the ground terminal GND;

[0024] The sampling module 100 is connected to the inductor L, the output terminal A of the DC-DC chip X10, and the comparison module 300 respectively. The sampling module 200 is used to: in response to the connection of the load module 200 with the output terminal A of the DC-DC chip X10, collect the inductor current flowing through the inductor L, and convert the inductor current into the corresponding first voltage and output it to the comparison module 300.

[0025] The comparison module 300 is also connected to the decision module 400. The comparison module 300 is used to: output a second voltage to the decision module 400 in response to the magnitude relationship between the first voltage and the first preset reference voltage U1.

[0026] The decision module 400 is used to: extract the DC voltage corresponding to the second voltage, and determine whether the output of the DC-DC chip X10 is abnormal in response to the relationship between the DC voltage and the second preset reference voltage U2.

[0027] In this way, through the cooperation of each module, it is only necessary to store the data of DC voltage and the second preset reference voltage to determine whether the output of the DCDC chip is abnormal, and thus it can be used for anomaly detection in the mass production of DCDC chips.

[0028] It should be understood that, such as Figure 1As shown, the DC-DC chip X10 includes an inductor L, a capacitor C, and a conversion structure. The inductor L is connected between the output terminal A of the DC-DC chip X10 and the conversion structure, and the capacitor C is connected between the output terminal A of the DC-DC chip X10 and the ground terminal GND. The conversion structure can be, but is not limited to, a buck converter, a boost converter, or a buck-boost converter; the specific configuration can be determined according to actual needs and is not limited here.

[0029] The following describes each module of the anomaly detection circuit.

[0030] I. Sampling Module

[0031] Optionally, such as Figure 2 As shown, the sampling module 100 includes a sampling resistor R1 and a proportional amplifier;

[0032] The first end of the sampling resistor R1 is connected to the inductor L and the first input terminal of the proportional amplifier, respectively. The second end of the sampling resistor R1 is connected to the output terminal A of the DC-DC chip X10 and the second input terminal of the proportional amplifier, respectively. The output terminal of the proportional amplifier is connected to the comparator module 300. The proportional amplifier is used to amplify the voltage across the sampling resistor R1 to form a first voltage and output the first voltage to the comparator module.

[0033] The sampling resistor R1 can convert the change in current flowing through inductor L into the change in voltage across the sampling resistor R1.

[0034] Thus, the voltage across the sampling resistor reflects the current flowing through the inductor, and the ripple characteristics of the voltage across the sampling resistor determine whether the output of the DC-DC chip is abnormal. The proportional amplifier amplifies the voltage across the sampling resistor by a certain ratio and outputs a first voltage, making the ripple characteristics of the first voltage more obvious than those of the voltage across the sampling resistor, facilitating processing by the comparison module and making the detection results of the anomaly detection circuit more accurate and reliable. The amplification ratio can be, but is not limited to, 1 / 2, 1, 2, 3, 4, or other ratios, and can be designed according to actual needs; no specific limitation is made here.

[0035] It should be understood that the sampling module can also consist of only a sampling resistor without a proportional amplifier. In this case, the voltage across the sampling resistor will be directly output to the comparator module, simplifying the circuit structure and reducing detection costs. Alternatively, the sampling module can also use constantan wire with an operational amplifier or a Hall sensor to collect the inductor current. Furthermore, the specific implementation of the sampling module can be designed according to actual needs and is not limited here. In addition, the specific structure of the proportional amplifier can be any structure well known to those skilled in the art and is not specifically limited here.

[0036] II. Load Module

[0037] Optionally, such as Figure 2 As shown, the load module 200 includes a load resistor R2 and a first switch K1, which are connected in series between the ground terminal GND and the output terminal A of the DC-DC chip X10.

[0038] After the first switch is closed, the load resistor is connected to the output terminal of the DC-DC chip, thus connecting the DC-DC chip to the load resistor and allowing the DC-DC chip to provide power to the load resistor. This process can be called load pulling. At the instant the first switch is closed, the DC-DC chip exhibits the instantaneous state of a load resistor being connected; this can be called a transient load.

[0039] Thus, the first switch allows the DC-DC chip to exhibit both pulled and transient load states. Since the inductor current of the DC-DC chip is prone to abnormalities under these conditions, the load module can increase the frequency of these abnormal inductor current readings. If the DC-DC chip is under no-load or has not experienced a transient load, the output of the abnormal chip may not show any abnormalities, or the frequency of inductor current abnormalities may not be frequent enough. In this case, detecting the inductor current could lead to misjudgments. However, if the DC-DC chip is under pulled or transient load, the output abnormalities are more easily reflected in the inductor current. Detecting the inductor current in this situation can reduce misjudgments and improve detection accuracy.

[0040] III. Comparison Module

[0041] Optionally, such as Figure 2 As shown, the comparison module 300 includes a comparator. The comparator can compare the magnitude of a first voltage and a first preset reference voltage U1. When the first voltage is greater than the first preset reference voltage U1, the output second voltage can be a high-level signal; when the first voltage is less than the first preset reference voltage U1, the output second voltage can be a low-level signal.

[0042] The comparator's built-in power supply can be used as the comparison power supply. The first preset reference voltage can be generated by the comparison power supply through a resistor divider, or it can be generated directly by an external DC regulated power supply. The specific value of the first preset reference voltage can be set according to actual needs, as long as it can realize the abnormal detection of the output of the DCDC chip, and is not limited here.

[0043] In this way, the comparison module can convert the first voltage in ripple form into the second voltage in square wave form, so as to facilitate subsequent processing of the second voltage and realize the abnormal detection of the output of the DC-DC chip.

[0044] IV. Judgment Module

[0045] Optionally, such as Figure 2 As shown, the decision module 400 includes a filtering unit and a detection unit, with the filtering unit connected between the comparison module and the detection unit;

[0046] The filtering unit is used to: extract the DC voltage corresponding to the second voltage;

[0047] The detection unit is used to determine whether the output of the DC-DC chip X10 is abnormal in response to the relationship between the DC voltage and the second preset reference voltage U2.

[0048] The filtering unit can be a low-pass filter, and the type of low-pass filter can be, but is not limited to, a passive low-pass filter or an active low-pass filter. The order of the low-pass filter can be selected according to actual needs and is not limited here. The detection unit can be, but is not limited to, an ADC sampling circuit or a comparator. The second preset reference voltage can be obtained by adjusting the operating status of the DCDC chip. It should be understood that when the first voltage is greater than the first preset reference voltage, a high-level signal is output; if the DC voltage is greater than the second preset reference voltage, the output of the DCDC chip will be abnormal.

[0049] Thus, by setting up a filtering unit, the AC component in the second voltage can be filtered out to extract the DC voltage. This allows the detection unit to make judgments based on the DC voltage and the second preset reference voltage, thereby enabling abnormal detection of the DCDC chip's output and achieving the purpose of abnormal detection.

[0050] V. Other Modules

[0051] Optionally, such as Figure 2 As shown, the anomaly detection circuit also includes a front-end voltage follower module 500, which is connected between the comparison module 300 and the decision module 400. The front-end voltage follower module 500 is used to: perform voltage follower processing on the second voltage and output it to the decision module 400.

[0052] The preceding voltage follower module processes the second voltage output by the comparison module. The processed voltage is the same as the original voltage, but the processed current is increased, which increases the power output to the decision module, enabling the decision module to operate smoothly. At the same time, the voltage signal received by the decision module will not be distorted. In addition, when the decision module includes a low-pass filter, the larger current allows the low-pass filter to obtain sufficient current in a shorter time, thereby shortening the anomaly detection time and improving the efficiency of anomaly detection.

[0053] Optionally, such as Figure 2As shown, the front-end voltage follower module 500 includes a voltage follower. Of course, the front-end voltage follower module 500 only needs to enable the electrical signal output by the comparator module 300 to drive the subsequent decision module 400 to work normally, and the voltage signal should not be distorted. The specific structure of the front-end voltage follower module 500 is not limited here.

[0054] Optionally, such as Figure 2 As shown, the anomaly detection circuit also includes a switching module 600, which is connected to the sampling module 100, the comparison module 300, and the voltage supply module 700, respectively. The switching module 600 is used for:

[0055] In response to an anomaly detection, the control sampling module 100 is connected to the comparison module 300 so that the first voltage provided by the sampling module 100 is output to the comparison module 300;

[0056] In response to a self-test, the control voltage supply module 700 is connected to the comparison module 300 so that the third voltage provided by the voltage supply module 700 is output to the comparison module 300.

[0057] The switching module 600 may include, but is not limited to, a first single-pole double-throw switch. The m1 terminal of the first single-pole double-throw switch is connected to the sampling module 100, the n1 terminal of the first single-pole double-throw switch is connected to the voltage supply module 700, and the S1 terminal of the first single-pole double-throw switch is connected to the comparison module 300. The switching module 600 can be manually controlled by an operator as needed. Alternatively, the switching module 600 can be controlled by a controller. For example, a program can be set in the controller to first connect the S1 terminal and the n1 terminal of the first single-pole double-throw switch during each power-on anomaly detection, thus connecting the comparison module 300 to the voltage supply module 700. The voltage supply module 700 is connected, and the comparison module 300 is disconnected from the sampling module 100. This allows the voltage supply module 700 to output a third voltage to the comparison module 300 for self-testing. After a normal self-test, the S1 terminal and M1 terminal of the first single-pole double-throw switch are automatically connected, connecting the comparison module 300 to the sampling module 100 and disconnecting the comparison module 300 from the voltage supply module 700. This allows the sampling module 100 to output a first voltage to the comparison module 300 for anomaly detection. The control method of the switch module 600 can be set according to actual needs and is not limited here.

[0058] In this way, by setting up a switch module and a voltage supply module, the abnormality detection circuit can perform self-tests. When the self-test is normal, it can perform abnormality detection, and when the self-test is abnormal, it can alert the operator to troubleshoot the abnormality detection circuit, thereby improving the reliability and accuracy of abnormality detection.

[0059] Optionally, such as Figure 2As shown, when the comparison module 300 includes a comparison power supply 31, the voltage supply module 700 is also connected to the comparison power supply 31; the voltage supply module 700 is specifically used to: divide the power supply voltage provided by the comparison power supply 31 and output a third voltage. Wherein, the comparison power supply 31 is... Figure 2 The middle diagonal filled portion, as shown, can be part of a comparator.

[0060] Optionally, such as Figure 2 As shown, the voltage supply module 700 may include voltage divider resistors R3 and R4, so that the power supply voltage of the comparison power supply 31 can be divided by voltage divider resistors R3 and R4 to output a third voltage. Of course, the voltage supply module 700 may also be configured in a manner well known to those skilled in the art, and is not limited thereto.

[0061] In this way, the voltage supply module does not need to be connected to an external power supply, simplifying the structure of the abnormality detection circuit and reducing costs.

[0062] Furthermore, when the anomaly detection circuit also includes a switching module, the comparison module is also used to: output a fourth voltage to the decision module in response to the magnitude relationship between the third voltage and the ground signal;

[0063] The decision module is also used to: determine that the anomaly detection circuit self-test is normal in response to receiving a fourth voltage.

[0064] During self-testing, the comparison module compares the magnitudes of the third voltage and the ground signal. When the third voltage is consistently higher than the ground signal, the comparison module outputs a high-level signal, indicating that the fourth voltage is a high-level signal. Thus, when the decision module receives a high-level signal, it can determine that the anomaly detection circuit self-test is normal; otherwise, the anomaly detection circuit self-test is abnormal. The self-testing process is simple and quick, improving the efficiency of anomaly detection.

[0065] Additionally, the decision module can determine that the anomaly detection circuit's self-test is normal upon receiving a high-level signal; alternatively, the decision module can receive a signal at intervals of time 't', and determine that the anomaly detection circuit's self-test is normal upon receiving a preset number of high-level signals. This avoids false judgments caused by interference and improves the accuracy of the self-test. The time interval 't' and the preset number can be set according to actual needs and are not limited here.

[0066] Continue to refer to Figure 2As shown, the comparison module 300 may further include: a second single-pole double-throw switch, the S2 terminal of which is connected to the comparator, the M2 terminal of which is connected to the input terminal of the first preset reference voltage, and the N2 terminal of which is connected to the ground terminal GND; during self-test, the S2 terminal of the second single-pole double-throw switch is connected to the N2 terminal, so that the comparator is connected to the ground terminal GND and disconnected from the input terminal of the first preset reference voltage, thereby inputting a ground signal to the comparison module 300; during anomaly detection, the S2 terminal of the second single-pole double-throw switch is connected to the M2 terminal, so that the comparator is connected to the input terminal of the first preset reference voltage and disconnected from the ground terminal GND, thereby inputting the first preset reference voltage to the comparison module 300. Of course, the second single-pole double-throw switch can also be manually controlled by an operator or controlled by a controller; the specific control method is not limited here.

[0067] It should be understood that, such as Figure 2 As shown, during self-testing, the S1 terminal of the first single-pole double-throw switch can also be connected to the M1 terminal. When the DC-DC chip X10 is powered on, the proportional amplifier can send an electrical signal to the comparator. Since this electrical signal is usually always greater than the ground signal, the comparator will also output a high-level signal (i.e., the fourth voltage) after comparing the electrical signal with the ground signal, thus determining whether the abnormal detection circuit is self-testing normally.

[0068] Based on the same inventive concept, this embodiment of the invention also provides a method for detecting anomalies in a DC-DC chip using the anomaly detection circuit described above. The implementation principle of this method is similar to that of the aforementioned anomaly detection circuit. For the specific implementation of this method, please refer to the aforementioned embodiment of the anomaly detection circuit. Repeated details will not be repeated here.

[0069] Specifically, an anomaly detection method provided in this embodiment of the invention, such as... Figure 3 As shown, it includes:

[0070] S301. The sampling module responds to the connection between the load module and the output terminal of the DCDC chip, collects the inductor current flowing through the inductor of the DCDC chip, and converts the inductor current into the corresponding first voltage and outputs it to the comparison module.

[0071] S302, The comparison module responds to the magnitude relationship between the first voltage and the first preset reference voltage and outputs a second voltage to the decision module;

[0072] S303, The decision module extracts the DC voltage corresponding to the second voltage, and determines whether the output of the DCDC chip is abnormal based on the relationship between the DC voltage and the second preset reference voltage.

[0073] Thus, by using steps S301 to S303 above, it is only necessary to store the data of the DC voltage and the second preset reference voltage to determine whether the output of the DCDC chip is abnormal, and thus it can be used for anomaly detection in the mass production of DCDC chips.

[0074] Optionally, if the anomaly detection circuit further includes a front-end voltage follower module, after step S302 and before step S303, the method may further include: the front-end voltage follower module performing voltage following processing on the second voltage and then outputting it to the decision module. In this way, the front-end voltage follower module enables the decision module to operate smoothly, shortens the anomaly detection time, and improves the efficiency of anomaly detection.

[0075] Optionally, when the anomaly detection circuit further includes a switching module, before executing step S301, the method may further include: the switching module, in response to a self-test, controlling the voltage supply module to connect with the comparison module, so that the third voltage provided by the voltage supply module is output to the comparison module; and the switching module, in response to anomaly detection, controlling the sampling module to connect with the comparison module, so that the first voltage provided by the sampling module is output to the comparison module. This enables the anomaly detection circuit to perform a self-test, improving the reliability and accuracy of anomaly detection.

[0076] Optionally, before executing step S301, the method may further include: the comparison module responding to the magnitude relationship between the third voltage and the ground signal, outputting a fourth voltage to the decision module; the decision module also responding to receiving the fourth voltage, determining that the anomaly detection circuit self-test is normal. Thus, by determining whether a fourth voltage is received for self-testing, the self-testing process is simplified and faster, improving the efficiency of anomaly detection.

[0077] Optionally, when the comparison module includes a comparison power supply, before executing step S301, the method may further include: the voltage supply module performing voltage division processing on the power supply voltage provided by the comparison power supply and outputting a third voltage. In this way, the voltage supply module does not need to be connected to an external power supply, reducing the production cost of the anomaly detection circuit.

[0078] The anomaly detection process provided by the embodiments of the present invention will be explained below with reference to specific examples.

[0079] Example 1: Combination Figure 2 The abnormal detection circuit shown is as follows: Figure 4 As shown, the self-test process includes:

[0080] S11. Connect the s1 terminal of the first single-pole double-throw switch to the n1 terminal, so that the voltage divider resistors R3 and R4 divide the power supply voltage of the comparison power supply 31 and output the third voltage to the comparator; connect the s2 terminal of the second single-pole double-throw switch to the n2 terminal, so that the grounding signal provided by the grounding terminal GND is transmitted to the comparator.

[0081] S12. The comparator determines whether the third voltage is greater than the ground signal; if yes, proceed to step 13; if no, proceed to step S14.

[0082] S13. The comparator outputs a high-level signal; proceed to step S15.

[0083] S14. The comparator outputs a low-level signal; proceed to step S15.

[0084] S15, the voltage follower and the filter unit process the received signal in sequence and output it to the detection unit;

[0085] S16. The detection unit determines whether the received signal is a high-level signal; if yes, proceed to step S17; if no, proceed to step S18.

[0086] S17. Confirm that the self-test is normal;

[0087] S18. If a self-test anomaly is detected, a warning is issued to remind the operator to check for faults in the anomaly detection circuit. After checking for faults, steps S11 to S18 are executed again.

[0088] Example 2: Combination Figure 2 The abnormal detection circuit shown is as follows: Figure 5 As shown, the anomaly detection process includes:

[0089] S21. Connect the s1 terminal of the first single-pole double-throw switch to the m1 terminal, so that the proportional amplifier is connected to the comparator; connect the s2 terminal of the second single-pole double-throw switch to the m2 terminal, so that the first preset reference voltage U1 can be input to the comparator.

[0090] S22. Close the first switch K1, so that the DC-DC chip is in a load-pull state;

[0091] S23. The proportional amplifier amplifies the voltage across the sampling resistor R1 by a certain ratio to obtain the first voltage and outputs it to the comparator.

[0092] S24. The comparator determines whether the first voltage is greater than the first preset reference voltage U1; if yes, proceed to step S25; if no, proceed to step S26.

[0093] S25. The second voltage output by the comparator is a high-level signal; proceed to step S27.

[0094] S26. The second voltage output by the comparator is a low-level signal; proceed to step S27.

[0095] S27. The voltage follower performs voltage following processing on the received second voltage and then outputs it to the filter unit.

[0096] S28. The filtering unit filters the AC voltage in the second voltage, retains the DC voltage, and outputs it to the detection unit.

[0097] S29. The detection unit determines whether the DC voltage is greater than the second preset reference voltage U2; if yes, then proceed to step S210; if no, then proceed to step S211.

[0098] S210. Determine that the output of the DC-DC chip X10 is abnormal;

[0099] S211. Confirm that the output of the DC-DC chip X10 is normal.

[0100] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An anomaly detection circuit for a DC-DC chip, characterized in that, include: Sampling module, load module, comparison module, decision module; The DC-DC chip includes an inductor, and the load module is used to connect to the output terminal of the DC-DC chip; The sampling module is connected to the inductor, the output terminal of the DC-DC chip, and the comparison module respectively. The sampling module is used to: in response to the connection of the load module to the output terminal of the DC-DC chip, collect the inductor current flowing through the inductor, and convert the inductor current into a corresponding first voltage and output it to the comparison module. The comparison module is also connected to the decision module, and the comparison module is used to: output a second voltage to the decision module in response to the magnitude relationship between the first voltage and the first preset reference voltage; The decision module is used to: extract the DC voltage corresponding to the second voltage, and determine whether the output of the DC-DC chip is abnormal in response to the relationship between the DC voltage and the second preset reference voltage.

2. The anomaly detection circuit as described in claim 1, characterized in that, The anomaly detection circuit further includes a front-end voltage follower module, which is connected between the comparison module and the decision module. The front-end voltage follower module is used to perform voltage follower processing on the second voltage and then output it to the decision module.

3. The anomaly detection circuit as described in claim 2, characterized in that, The front-end voltage follower module includes a voltage follower.

4. The anomaly detection circuit as described in claim 1, characterized in that, The sampling module includes a sampling resistor and a proportional amplifier; The first end of the sampling resistor is connected to the inductor and the first input end of the proportional amplifier, the second end of the sampling resistor is connected to the output end of the DC-DC chip and the second input end of the proportional amplifier, and the output end of the proportional amplifier is connected to the comparison module. The proportional amplifier is used to amplify the voltage across the sampling resistor to form the first voltage and output the first voltage to the comparison module.

5. The anomaly detection circuit as described in claim 1, characterized in that, The decision module includes a filtering unit and a detection unit, wherein the filtering unit is connected between the comparison module and the detection unit; The filtering unit is used to: extract the DC voltage corresponding to the second voltage; The detection unit is used to determine whether the output of the DC-DC chip is abnormal in response to the relationship between the DC voltage and the second preset reference voltage.

6. The anomaly detection circuit as described in claim 1, characterized in that, The load module includes a load resistor and a first switch, which are connected in series between the ground terminal and the output terminal of the DC-DC chip.

7. The anomaly detection circuit as described in any one of claims 1-6, characterized in that, The anomaly detection circuit further includes a switching module, which is connected to the sampling module, the comparison module, and the voltage supply module, respectively. The switching module is used for: In response to an anomaly detection, the sampling module is connected to the comparison module so that the first voltage provided by the sampling module is output to the comparison module; In response to a self-test, the voltage supply module is connected to the comparison module so that the third voltage provided by the voltage supply module is output to the comparison module.

8. The anomaly detection circuit as described in claim 7, characterized in that, The comparison module is further configured to: output a fourth voltage to the decision module in response to the magnitude relationship between the third voltage and the ground signal; The decision module is also used to: determine that the anomaly detection circuit is functioning normally in response to receiving the fourth voltage.

9. The anomaly detection circuit as described in claim 7, characterized in that, The comparison module includes a comparison power supply, and the voltage supply module is also connected to the comparison power supply. The voltage providing module is specifically used to: divide the power supply voltage provided by the comparison power supply and output the third voltage.

10. A method for detecting anomalies in a DC-DC chip using the anomaly detection circuit as described in any one of claims 1-9, characterized in that, include: The sampling module responds to the connection between the load module and the output terminal of the DC-DC chip, collects the inductor current flowing through the inductor of the DC-DC chip, and converts the inductor current into a corresponding first voltage and outputs it to the comparison module; The comparison module responds to the magnitude relationship between the first voltage and the first preset reference voltage and outputs a second voltage to the decision module. The decision module extracts the DC voltage corresponding to the second voltage and, in response to the relationship between the DC voltage and the second preset reference voltage, determines whether the output of the DCDC chip is abnormal.

Images