Power supply operation state detection method and detection device

Abstract

The application provides a power supply working state detection method and a detection device. The power supply comprises a primary side circuit, a transformer and a secondary side circuit. The secondary side circuit comprises a secondary side current detection unit, a temperature detection unit and a secondary side control unit. First, the secondary side current detection unit is used to detect a current value of the secondary side circuit. Then, the secondary side control unit compares the current value of the secondary side circuit with a preset current threshold value. When the current value of the secondary side circuit is less than or equal to the preset current threshold value, the temperature detection unit detects a temperature value of the power supply, and the secondary side control unit determines the working state of the power supply according to the obtained temperature value of the power supply. Thus, the detection of the working state of the power supply is independently realized by using the secondary side circuit of the power supply, the dependence on the power detection accuracy of the primary side circuit is reduced, the realization is high, the cost of the power supply is not increased, and the application is wide.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a method and device for detecting the operating status of a power supply. Background Technology

[0002] With the rapid development of science and technology, electronic devices are becoming increasingly closely related to people's work and life. Electronic devices cannot function without a reliable power supply. In order to enable electronic devices to have excellent performance, increasingly higher safety requirements are being placed on the power supply of electronic devices. Therefore, it is often necessary to test the working status of the power supply to ensure that the power supply is working under normal conditions.

[0003] In existing technologies, the operating status of a power supply can be determined by detecting either its primary or secondary circuits. However, due to limitations in the primary circuit's operation and issues such as insufficient power calculation accuracy or inadequate power protection range, the primary circuit cannot be relied upon to determine the power supply's operating status for power protection. In the secondary circuit, the operating status can be determined by detecting the power supply's output current. This method is simple to implement and has high calculation accuracy, but it requires the current detection unit to function properly. If the current detection unit malfunctions, i.e., it fails to correctly detect the power supply's output current, the secondary circuit loses its ability to monitor the power supply's output power, and therefore, the operating status cannot be detected through the secondary circuit. Therefore, when both the primary and secondary circuit protection methods fail, a new method is urgently needed to monitor the power supply's operating status.

[0004] By monitoring the power supply's operating status, it's possible to ensure it meets various safety standards, such as the Limited Power Supply (LPS) test specification. Specifically, when the power supply's rated output power is low, because the rated power is much lower than the power limit, although the power detection accuracy of the primary circuit is low, the power supply can still meet the LPS test specification even when the current detection unit of the secondary circuit is bypassed. However, with the continuous development of electronic devices, when the power supply's rated output power approaches the power limit, the primary control unit cannot accurately detect the actual output power. Therefore, when the current detection unit of the secondary circuit is bypassed, relying solely on the overpower protection of the primary circuit is insufficient to meet the LPS test specification. Existing methods utilize the secondary control unit to detect fluctuations in the power supply's output voltage to assess its output power. Specifically, the secondary control unit samples the power supply's output voltage and monitors its fluctuations in real time. Based on these fluctuations, the magnitude of the power supply's output power is determined, thus clarifying the power supply's operating status.

[0005] However, existing solutions are highly dependent on the power detection accuracy of the primary control unit and have high requirements for the secondary control unit. If the sampling accuracy of the output voltage of the secondary control unit is insufficient, an additional high-precision analog signal acquisition unit is required. High-precision analog signal acquisition units are expensive, posing a greater challenge to power supply costs. Summary of the Invention

[0006] This application provides a power supply operating status detection method and detection device to solve the technical problems of poor feasibility and increased power supply cost in the prior art for detecting the operating status of power supplies.

[0007] In a first aspect, this application provides a method for detecting the operating state of a power supply, wherein the power supply includes a secondary circuit, and the detection method includes:

[0008] Obtain the current value of the secondary circuit and compare the current value of the secondary circuit with a preset current threshold.

[0009] When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature value of the power supply is obtained, and the operating state of the power supply is determined based on the temperature value.

[0010] In one possible design, determining the operating state of the power supply based on the obtained temperature value of the power supply includes:

[0011] The first temperature value of the power supply is obtained at the first moment;

[0012] The second temperature value of the power supply is obtained at the second moment;

[0013] The temperature change rate of the power supply is determined based on the first time point, the second time point, the first temperature value, and the second temperature value, and the temperature change rate is compared with a preset change rate, wherein the preset change rate represents the rate of temperature rise.

[0014] When the temperature change rate is greater than the preset change rate, the power supply is determined to be in an abnormal operating state.

[0015] When the temperature change rate is less than or equal to the preset change rate, the power supply is determined to be in a normal operating state.

[0016] In one possible design, the preset current threshold is 0.1A.

[0017] In one possible design, when the operating state of the power supply is determined to be the abnormal state, the protection action of the power supply is triggered.

[0018] The protection action includes at least one of shutting down the power supply output, restarting the power supply, and reducing the power supply output voltage.

[0019] In one possible design, once the operating state of the power supply is determined to be the normal state, the power supply is controlled to maintain the current state.

[0020] In one possible design, when the rated output power of the power supply is greater than 0 and less than or equal to 100W, the testing method is used to ensure that the power supply meets the Limited Power Supply test specifications.

[0021] In one possible design, the power supply includes a power adapter.

[0022] Secondly, this application provides a detection device for detecting the operating state of a power supply, wherein the power supply includes a primary circuit, a transformer, and a secondary circuit, and the secondary circuit serves as the detection device, comprising:

[0023] The secondary current detection unit is electrically coupled to either end of the secondary winding of the transformer and is used to detect the current value of the secondary circuit.

[0024] A temperature detection unit is used to detect the temperature value of the power supply; and

[0025] A secondary-side control unit is electrically connected to the secondary-side current detection unit and the temperature detection unit. The secondary-side control unit is configured to compare the current value of the secondary-side circuit with a preset current threshold, and when the current value of the secondary-side circuit is less than or equal to the preset current threshold, determine the operating state of the power supply based on the obtained temperature value of the power supply.

[0026] In one possible design, determining the operating state of the power supply based on the obtained temperature value of the power supply includes:

[0027] The first temperature value of the power supply is obtained at the first moment;

[0028] The second temperature value of the power supply is obtained at the second moment;

[0029] The temperature change rate of the power supply is determined based on the first time point, the second time point, the first temperature value, and the second temperature value, and the temperature change rate is compared with a preset change rate, wherein the preset change rate represents the rate of temperature rise.

[0030] When the temperature change rate is greater than the preset change rate, the power supply is determined to be in an abnormal operating state.

[0031] When the temperature change rate is less than or equal to the preset change rate, the power supply is determined to be in a normal operating state.

[0032] In one possible design, the preset current threshold is 0.1A.

[0033] In one possible design, when the rated output power of the power supply is greater than 0 and less than or equal to 100W, the testing device is used to ensure that the power supply meets the Limited Power Supply test specifications.

[0034] In one possible design, the secondary circuit further includes: a first power switch;

[0035] The first and second terminals of the first power switch are electrically coupled to the first and second terminals of the secondary winding, respectively, and the third terminal of the first power switch is electrically connected to the secondary control unit.

[0036] When the power supply is determined to be in an abnormal state, the first power switch is turned off via the control signal output by the secondary control unit.

[0037] In one possible design, the secondary circuit also includes: a rectifier circuit and an output capacitor;

[0038] The first terminal of the rectifier circuit is electrically coupled to the first terminal of the secondary winding of the transformer, the second terminal of the rectifier circuit is electrically coupled to the first terminal of the output capacitor, and the second terminal of the output capacitor is electrically coupled to the second terminal of the secondary winding of the transformer.

[0039] This application provides a method and apparatus for detecting the operating status of a power supply. The power supply includes a primary circuit, a transformer, and a secondary circuit. The secondary circuit includes a secondary current detection unit, a temperature detection unit, and a secondary control unit. First, the secondary current detection unit detects the current value of the secondary circuit. Then, the secondary control unit compares the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature detection unit detects the temperature value of the power supply. The secondary control unit determines the operating status of the power supply based on the obtained temperature value. Thus, the operating status of the power supply can be independently detected using its built-in secondary circuit. The detection method provided in this application can determine the operating status of the power supply based on the temperature value detected by the temperature detection unit when the secondary current detection unit malfunctions, reducing the dependence on the power detection accuracy of the primary circuit. It not only has high feasibility but also does not increase the cost of the power supply, making it widely applicable. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of a detection device provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of another detection device provided in an embodiment of this application;

[0043] Figure 3 A flowchart illustrating a power supply operating state detection method provided in an embodiment of this application;

[0044] Figure 4 This is a flowchart illustrating another power supply operating state detection method provided in an embodiment of this application. Detailed Implementation

[0045] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and apparatus consistent with some aspects of this application as detailed in the appended claims.

[0046] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a 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.

[0047] Figure 1 This is a schematic diagram of a detection device provided in an embodiment of this application. The detection device provided in this embodiment is suitable for detecting the operating state of the power supply 100, such as... Figure 1As shown, the power supply 100 includes: a primary circuit 101, a transformer 102 (including a primary winding L0 and a secondary winding L1), and a secondary circuit 103, wherein the secondary circuit 103 serves as a detection device and includes:

[0048] The secondary current detection unit 1031 is electrically coupled to any end of the secondary winding of the transformer 102 and is used to detect the current value of the secondary circuit 103.

[0049] Temperature detection unit 1033 is used to detect the temperature value of power supply 100; and

[0050] The secondary control unit 1032 is electrically connected to the secondary current detection unit 1031 and the temperature detection unit 1033.

[0051] Furthermore, the secondary control unit 1032 is configured to compare the current value of the secondary circuit 103 with a preset current threshold, and when the current value of the secondary circuit 103 is less than or equal to the preset current threshold, determine the operating state of the power supply 100 based on the temperature value of the power supply 100 detected by the temperature detection unit 1033, thereby realizing the detection of the operating state of the power supply 100.

[0052] In one possible design, when the secondary control unit 1032 determines the operating state of the power supply 100 based on the temperature value of the power supply 100, the secondary control unit 1032 is configured to perform the following steps:

[0053] At the first moment (t1), the first temperature value (T1) of the power supply 100 is obtained;

[0054] At the second moment (t2), the second temperature value (T2) of the power supply 100 is obtained;

[0055] The temperature change rate of power supply 100 is determined based on the first time (t1), the second time (t2), the first temperature value (T1), and the second temperature value (T2), and this temperature change rate is compared with the preset change rate, which represents the rate of temperature rise.

[0056] When the temperature change rate is greater than the preset change rate, the working state of power supply 100 is determined to be abnormal.

[0057] When the temperature change rate is less than or equal to the preset change rate, the power supply 100 is determined to be in normal working condition.

[0058] It is understood that the secondary current detection unit 1031 can be configured as an ammeter, and the temperature detection unit 1033 can be configured as a thermometer. The specifications and models of the ammeter and thermometer can be set according to the actual working conditions. This embodiment does not limit this.

[0059] Optionally, the secondary control unit 1032 may include an integrated circuit (IC) chip to integrate the corresponding functions configured therein.

[0060] Optionally, continue to refer to Figure 1 As shown, the secondary circuit 103 of the power supply 100 may further include:

[0061] First power switch 1034.

[0062] The first and second terminals of the first power switch 1034 are electrically coupled to the first and second terminals of the secondary winding L1, respectively, and the third terminal of the first power switch 1034 is electrically connected to the secondary control unit 1032. When the operating state of the power supply 100 is determined to be abnormal, the first power switch 1034 is turned off via a control signal output from the secondary control unit 1032, in order to adapt to the protection action of the triggered power supply 100.

[0063] Optionally, continue to refer to Figure 1 As shown, the secondary circuit 103 may also include: a rectifier circuit 1035 and an output capacitor (C) 1036.

[0064] In the secondary circuit 103, the first terminal of the rectifier circuit 1035 is electrically coupled to the first terminal of the secondary winding L1 of the transformer 102, and the second terminal of the rectifier circuit 1035 is electrically coupled to the first terminal of the output capacitor 1036. The second terminal of the output capacitor 1036 is electrically coupled to the second terminal of the secondary winding L1 of the transformer 102. Specifically, as follows... Figure 1 As shown, the first terminal of the secondary winding L1 is connected to the first terminal of the rectifier circuit 1035, the second terminal of the rectifier circuit 1035 is connected to the first terminal of the first power switch 1034, the second terminal of the first power switch 1034 is connected to the first terminal of the output capacitor 1036, and the second terminal of the output capacitor 1036 is grounded. The third terminal of the first power switch 1034 is connected to the first terminal of the secondary control unit 1032, and the second and third terminals of the secondary control unit 1032 are respectively connected to the secondary current detection unit 1031 and the temperature detection unit 1033. The secondary current detection unit 1033 is electrically connected between the second terminal of the secondary winding L1 and the second terminal of the output capacitor 1036.

[0065] It is understandable that the positions of the rectifier circuit 1035 and the secondary current detection unit 1033 in the secondary circuit 103 are not limited to this, as long as they can respectively achieve the functions of limiting reverse current and acquiring the current value of the secondary circuit 103. The rectifier circuit 1035 can be set as a diode or other device with rectification function, or it can be set as a circuit with rectification function. The output capacitor 1036 is used to stabilize the output voltage of the power supply 100. The opening and closing of the first power switch 1034 can control the output of the power supply 100 accordingly. The secondary current detection unit 1031 in the secondary circuit 103 can detect the current value of the secondary circuit 103, and the temperature detection unit 1033 in the secondary circuit 103 can detect the temperature value of the power supply 100. The secondary control unit 1032 can, based on the obtained current value of the secondary circuit 103 and the temperature value of the power supply 100, detect the operating state of the power supply 100 by determining the temperature change rate of the power supply 100 when the current value of the secondary circuit 103 is less than or equal to a preset current threshold. Furthermore, the temperature detection unit 1033 mainly detects the temperature values ​​of the transformer 102 and the rectifier circuit 1035 in the power supply 100.

[0066] Figure 2 This is a schematic diagram of another detection device provided in an embodiment of this application. This detection device is suitable for detecting the operating state of the power supply 200, such as… Figure 2 As shown, the power supply 200 includes: a primary circuit 201, a transformer 202 (including a primary winding L0 and a secondary winding L1), and a secondary circuit 203. The secondary circuit 203 includes: a secondary current detection unit 2031, a secondary control unit 2032, and a temperature detection unit 2033. Optionally, the secondary circuit 203 may further include: a first power switch 2034, a rectifier circuit 2035, and an output capacitor 2036. The above components are related to... Figure 1 The components shown are similar, and the similar component labels represent the similar component structures, functions, and roles, so they will not be described again here.

[0067] In this embodiment, the primary circuit 201 of the power supply 200 includes a second power switch 2011, a primary control unit 2012, and a primary current detection unit 2013. In the primary circuit 201, one end of the primary winding is connected to the first end of the second power switch 2011, and the other end of the primary winding is connected to the input terminal of the power supply. The second end of the second power switch 2011 is connected to the first end of the primary control unit 2012, and the third end of the second power switch 2011 is connected to the first end of the primary current detection unit 2013. The second end of the primary current detection unit 2013 is connected to the second end of the primary control unit 2012. The primary control unit 2012 controls the output of the power supply 200 by controlling the on / off state of the second power switch 2011. The third end of the primary current detection unit 2013 is grounded.

[0068] In addition, the primary-side current detection unit 2013 can detect the current value of the primary-side circuit 201, and the primary-side control unit 2012 may include an IC chip to perform corresponding control operations. For example, the primary-side control unit 2012 can collect the voltage value of the primary-side circuit 201 and the current value of the primary-side circuit 201 detected by the primary-side current detection unit 2013 to detect the output power of the power supply 200 and determine the operating state of the power supply 200 based on the detection results. However, because the current and voltage detection accuracy of the primary-side control unit 2012 is relatively low, it cannot accurately calculate the actual output power of the power supply 200.

[0069] Optionally, the power supply 100 and power supply 200 provided in this application may also be power adapters.

[0070] The secondary circuit 103 (or 203) of the power supply 100 (or 200) provided in this application can be used as a detection device to detect the operating status of the power supply 100 (or 200). Furthermore, it can be applied to ensure that when the rated output power of the power supply 100 (or 200) is greater than 0 and less than or equal to 100W, the detection device can make the power supply 100 (or 200) meet the requirements of a limited power supply. According to the requirements of the Supply, LPS) test specification, when the secondary current detection unit 1031 (or 2031) detects that the current value of the secondary circuit 103 (or 203) is less than or equal to a preset current threshold, the preset current threshold is any value slightly greater than 0 (e.g., 0.1A). The specific value of the preset current threshold can be dynamically adjusted according to the actual operating conditions to indicate that the secondary current detection unit 1031 (or 2031) is in an abnormal state (e.g., being bypassed). At this time, the operating state of the power supply 100 (or 200) can be determined according to the temperature value of the power supply 100 (or 200) detected by the temperature detection unit 1033 (or 2033). When the operating state of the power supply 100 (or 200) is determined to be an abnormal state, the protection action of the power supply 100 (or 200) is triggered.

[0071] It should be noted that the above application scenarios are merely illustrative, and the detection device suitable for detecting the working state of the power supply provided in this application embodiment includes, but is not limited to, the above application scenarios.

[0072] The above is a detailed description of the working principle and implementation process of the detection device provided in the embodiments of this application. The following describes the detailed technical solution of the power supply operating state detection method provided in the embodiments of this application. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0073] Figure 3 This is a flowchart illustrating a power supply operating state detection method provided in an embodiment of this application, wherein the power supply includes a secondary circuit. Further, this power supply operating state detection method can be implemented in any of the aforementioned power supplies. Figure 3 As shown, the power supply operating status detection method provided in this embodiment includes:

[0074] S101: Obtain the current value of the secondary circuit and compare the current value of the secondary circuit with the preset current threshold.

[0075] For example, the secondary current detection unit in the secondary circuit detects the current in the secondary circuit to obtain the current value of the secondary circuit. Then, the obtained current value of the secondary circuit is compared with a preset current threshold. The preset current threshold is a preset current value that can be dynamically adjusted.

[0076] S102: When the current value of the secondary circuit is less than or equal to the preset current threshold, obtain the temperature value of the power supply and determine the working state of the power supply based on the temperature value.

[0077] The obtained current value of the secondary circuit is compared with a preset current threshold. After judgment, if the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature value of the power supply is further obtained and the working state of the power supply is determined based on the obtained temperature value. The temperature detection unit in the secondary circuit can be used to detect the temperature value of the power supply, and then the secondary control unit determines the working state of the power supply based on the temperature value.

[0078] In one possible design, when the current value of the secondary circuit is equal to 0, the temperature value of the power supply is obtained, and the operating state of the power supply is determined based on the temperature value.

[0079] In one possible design, due to limitations in the sampling accuracy of the secondary current detection unit and the influence of various interferences during sampling, the preset current threshold can be dynamically adjusted to any value slightly greater than 0. If the actual current value of the secondary circuit is less than or equal to this preset current threshold, it can be approximately determined that the current value of the secondary circuit is 0.

[0080] Furthermore, when the secondary circuit current is zero, the power supply should be in an unloaded state under normal conditions. The transformer and other components in the power supply may not generate heat, or the heat generated may gradually decrease. However, when the secondary current detection unit is in an abnormal state (e.g., bypassed), it cannot correctly detect the power supply's output current. In this case, the power supply's output current is also zero or approximately zero. However, as the power supply's output power increases, the transformer and other components will generate more and more heat. Therefore, when the secondary circuit current is less than or equal to a preset current threshold, the power supply's operating state can be further determined by detecting its temperature.

[0081] Figure 4 This is a flowchart illustrating another power supply operating state detection method provided in an embodiment of this application, wherein the power supply includes a secondary circuit. Further, this power supply operating state detection method can be implemented in any of the aforementioned power supplies. The power supply operating state detection method provided in this embodiment includes:

[0082] S201: Obtain the current value of the secondary circuit and compare the current value of the secondary circuit with the preset current threshold.

[0083] For example, the secondary current detection unit in the secondary circuit detects the current in the secondary circuit to obtain the current value of the secondary circuit. Then, the obtained current value of the secondary circuit is compared with a preset current threshold. The preset current threshold is a preset current value that can be dynamically adjusted.

[0084] S202: When the current value of the secondary circuit is less than or equal to the preset current threshold, the first temperature value of the power supply is obtained at the first moment and the second temperature value of the power supply is obtained at the second moment.

[0085] The first moment and the second moment are any two moments with a preset time interval. The preset time interval can be in the range of seconds, and the specific value is not limited in this embodiment.

[0086] The temperature value of the power supply is acquired at the first time (t1), and the acquired temperature value is the first temperature value (T1). Further, the temperature value of the power supply is acquired at the second time (t2), and the acquired temperature value is the second temperature value (T2).

[0087] For example, the temperature detection unit in the secondary circuit can be used to detect the temperature value of the power supply at the first moment and the second moment, respectively, to obtain the first temperature value and the second temperature value.

[0088] S203: Determine the temperature change rate of the power supply based on the first moment, the second moment, the first temperature value, and the second temperature value, and compare the temperature change rate with the preset change rate.

[0089] The preset rate of change characterizes the rate of temperature increase.

[0090] By obtaining the first temperature value at the first moment and the second temperature value at the second moment, the temperature change of the power supply during the time interval between the first moment and the second moment can be determined.

[0091] In one feasible approach, when the second moment is later than the first moment, the temperature change of the power supply can be determined by the following expression (1):

[0092]

[0093] Accordingly, when the first moment is later than the second moment, the temperature change of the power supply can be determined by the following expression (2):

[0094]

[0095] In the above expressions (1) and (2), a1 and a2 represent the rate of temperature change of the power supply during the time intervals t1 and t2, respectively.

[0096] After obtaining the temperature change rate of the power supply, the change rate is compared with the preset change rate to determine the operating state of the power supply based on the comparison result.

[0097] The specific value corresponding to the preset rate of change can be set according to the actual operating conditions. For example, the preset rate of change can be described as the power supply temperature rising by 3°C in 40 seconds. Obviously, it can also be the power supply temperature rising by 4°C or other temperature values ​​within 40 seconds, or the power supply temperature rising by other corresponding temperatures at other time intervals, etc. This embodiment does not limit this.

[0098] By comparing the temperature change rate of the power supply with the preset change rate, the operating state of the power supply can be determined as normal or abnormal based on the comparison result, i.e., step S204 or step S205 is executed according to the comparison result. Additionally, it should be noted that when the secondary current detection unit of the power supply is bypassed, the no-load state is the normal operating state of the power supply.

[0099] S204: When the temperature change rate is greater than the preset change rate, the power supply is determined to be in an abnormal state.

[0100] As described above, when the temperature change rate is greater than the preset change rate, it indicates that the temperature of the power supply is rising too fast, exceeding the temperature rise rate corresponding to the preset change rate. Therefore, the working state of the power supply can be determined to be abnormal.

[0101] S205: When the temperature change rate is less than or equal to the preset change rate, the power supply is determined to be in normal working condition.

[0102] Conversely, if the temperature change rate of the obtained power supply is less than or equal to the preset change rate, the following situations may occur:

[0103] In the first case, the temperature value of the power supply does not change within the time interval between the first moment and the second moment, that is, the determined temperature change rate of the power supply is zero, which is less than the preset change rate.

[0104] In the second case, the temperature of the power supply decreased within the time interval between the first and second moments, that is, the determined temperature change rate of the power supply was negative, which was less than the preset change rate.

[0105] In the third scenario, the temperature of the power supply increases within the time interval between the first and second moments, but the rate of increase, i.e., the determined rate of temperature change of the power supply, is less than or equal to the preset rate of change. In other words, the rate of temperature increase of the power supply within the time interval between the first and second moments is slow and does not exceed the preset rate of change.

[0106] If the determined temperature change rate of the power supply falls into any of the above-mentioned categories, the power supply can be determined to be in a normal operating state. In other words, if the secondary current detection unit of the power supply is in an abnormal state, and the temperature change rate of the power supply is less than or equal to the preset change rate, the power supply can be determined to be in a normal operating state.

[0107] After determining the operating state of the power supply, steps S206 or S207 can be further executed based on the determined operating state.

[0108] If the power supply is determined to be in an abnormal state, proceed to step S206. If the power supply is determined to be in a normal state, proceed to step S207.

[0109] S206: Triggers the protection action of the power supply.

[0110] The protection actions include at least one of the following: shutting off the power supply output, restarting the power supply, or reducing the power supply output voltage.

[0111] When the power supply is determined to be in an abnormal state, the power supply's protection action needs to be triggered. The protection action includes, but is not limited to, at least one of the following actions: shutting down the power supply output, restarting the power supply, or reducing the power supply output voltage. The specific actions can be set according to the actual situation, and this embodiment does not limit them.

[0112] S207: Control the power supply to maintain the current state.

[0113] When the power supply is determined to be in a normal operating state, the power supply is controlled to maintain the current state. For example, the power supply is controlled to maintain the current output state.

[0114] The power supply operating status detection method provided in this application detects the power supply's operating status by acquiring the power supply's temperature value when the secondary current detection unit is in an abnormal state, and determining whether the power supply is in a normal or abnormal state based on the temperature change rate. This method requires only the power supply's built-in secondary circuit to independently detect the power supply's operating status, making it simple and easy to operate. Furthermore, it reduces reliance on the power detection accuracy of the primary circuit and does not increase the power supply cost, demonstrating high feasibility and wide applicability.

[0115] With the rapid development of science and technology, among the requirements for power supply ratings, the Limited Power Supply (LPS) test specification is a common specification that low-power power supplies must meet. The LPS specification requires that if the output power of the power supply exceeds the limit output power when the secondary current detection unit is bypassed, corresponding protection actions must be triggered. Therefore, the aforementioned power supply operating state detection method can be applied to the LPS test specification. In other words, the power supply operating state detection method provided in this application can be used to ensure that the power supply meets the LPS test specification. For example, when the obtained secondary circuit current value is equal to or approximately equal to 0, that is, the obtained secondary circuit current value is less than or equal to a preset current threshold, it indicates that the power supply has no output current or the secondary current detection unit is in an abnormal state (e.g., bypassed). If it is further determined that the power supply's operating state is abnormal, the power supply's protection action can be triggered.

[0116] Specifically, the power supply operating state detection method provided in this application embodiment is applied to, for example, Figure 1 In the power supply shown in Figure 2, when the rated output power of the power supply is close to the power limit of the power supply, due to the insufficient power detection accuracy of the primary side control unit, when the secondary side current detection unit is bypassed, relying solely on the primary side control unit will make the power supply unable to meet the LPS test specifications. Therefore, the power supply operating status detection method provided in this embodiment can enable the power supply to meet the LPS test specifications when the power detection accuracy of the primary side control unit is insufficient.

[0117] The specific requirements of the LPS test specification are already stipulated in the 60950IEC-1 standard, and will not be repeated here. Generally, power supplies with a rated output power greater than 0 and less than or equal to 100W are required to meet the LPS test specification in their operating state. Therefore, the power supply operating state detection method provided in this application is applicable to power supplies with a rated output power greater than 0 and less than or equal to 100W.

[0118] This application provides a method and apparatus for detecting the operating status of a power supply. The power supply includes a primary circuit, a transformer, and a secondary circuit. The secondary circuit, serving as the detection apparatus, includes a secondary current detection unit, a temperature detection unit, and a secondary control unit. First, the secondary current detection unit detects the current value of the secondary circuit. Then, the secondary control unit compares the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature detection unit detects the temperature value of the power supply and determines the operating status of the power supply based on the obtained temperature value. This method allows for independent detection of the power supply's operating status using the power supply's built-in secondary circuit. This approach can determine the power supply's operating status based on the temperature value detected by the temperature detection unit when the secondary current detection unit malfunctions, reducing reliance on the power detection accuracy of the primary circuit. It not only has high feasibility but also does not increase the cost of the power supply, making it widely applicable.

[0119] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0120] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for detecting the operating state of a power supply, wherein the power supply includes a secondary circuit, characterized in that, The detection method includes: Obtain the current value of the secondary circuit and compare the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature change rate of the power supply is determined and compared with the preset change rate, which represents the rate of temperature rise. When the temperature change rate is greater than the preset change rate, the power supply is determined to be in an abnormal operating state. When the temperature change rate is less than or equal to the preset change rate, the power supply is determined to be in a normal operating state. Determining the temperature change rate of the power supply includes: The first temperature value of the power supply is obtained at the first moment; The second temperature value of the power supply is obtained at the second moment; The temperature change rate of the power supply is determined based on the first time point, the second time point, the first temperature value, and the second temperature value. Wherein, when the current value of the secondary circuit is less than or equal to the preset current threshold, it indicates that the secondary current detection unit is in an abnormal state or the power supply is in an unloaded state. When the temperature change rate is greater than the preset change rate, it indicates that the output power of the power supply has increased abnormally. When the rated output power of the power supply is greater than 0 and less than or equal to 100W, the testing method is used to make the power supply meet the Limited Power Supply (LPS) test specification.

2. The power supply operating status detection method according to claim 1, characterized in that, The preset current threshold is 0.1A.

3. The power supply operating status detection method according to claim 1, characterized in that, Once the operating state of the power supply is determined to be in the abnormal state, the protection action of the power supply is triggered. The protection action includes at least one of shutting down the power supply output, restarting the power supply, and reducing the power supply output voltage.

4. The power supply operating status detection method according to claim 1, characterized in that, Once the power supply is determined to be in the normal operating state, the power supply is controlled to maintain the current state.

5. The power supply operating status detection method according to claim 1, characterized in that, The power source includes a power adapter.

6. A detection device suitable for detecting the operating state of a power supply, said power supply comprising a primary circuit, a transformer, and a secondary circuit, characterized in that, The secondary circuit serves as the detection device and includes: A secondary current detection unit, electrically coupled to either end of the secondary winding of the transformer, is used to detect the current value of the secondary circuit; and A secondary-side control unit, electrically connected to the secondary-side current detection unit, is configured to compare the current value of the secondary-side circuit with a preset current threshold. When the current value of the secondary-side circuit is less than or equal to the preset current threshold, the control unit determines the temperature change rate of the power supply and compares the temperature change rate with a preset change rate, where the preset change rate characterizes the rate of temperature rise. When the temperature change rate is greater than the preset change rate, the power supply is determined to be in an abnormal operating state. When the temperature change rate is less than or equal to the preset change rate, the power supply is determined to be in a normal operating state. The secondary circuit also includes a temperature detection unit; The temperature detection unit is used to detect the temperature value of the power supply; the secondary control unit is electrically connected to the temperature detection unit, and the temperature change rate of the power supply is determined, wherein a first temperature value of the power supply is acquired at a first moment; a second temperature value of the power supply is acquired at a second moment; and the temperature change rate of the power supply is determined based on the first moment, the second moment, the first temperature value, and the second temperature value. When the rated output power of the power supply is greater than 0 and less than or equal to 100W, the testing device is used to make the power supply meet the Limited Power Supply (LPS) test specifications. When the current value of the secondary circuit is less than or equal to the preset current threshold, it indicates that the secondary current detection unit is in an abnormal state or the power supply is in an unloaded state. When the temperature change rate is greater than the preset change rate, it indicates that the output power of the power supply has increased abnormally.

7. The detection device according to claim 6, characterized in that, The preset current threshold is 0.1A.

8. The detection device according to claim 6, characterized in that, The secondary circuit also includes: a first power switch; The first and second terminals of the first power switch are electrically coupled to the first and second terminals of the secondary winding, respectively, and the third terminal of the first power switch is electrically connected to the secondary control unit. When the power supply is determined to be in an abnormal state, the first power switch is turned off via the control signal output by the secondary control unit.

9. The detection device according to claim 6, characterized in that, The secondary circuit also includes: a rectifier circuit and an output capacitor; The first terminal of the rectifier circuit is electrically coupled to the first terminal of the secondary winding of the transformer, the second terminal of the rectifier circuit is electrically coupled to the first terminal of the output capacitor, and the second terminal of the output capacitor is electrically coupled to the second terminal of the secondary winding of the transformer.

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