CN217060409U - PFC circuit fault detection device and frequency conversion equipment - Google Patents
PFC circuit fault detection device and frequency conversion equipment Download PDFInfo
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- CN217060409U CN217060409U CN202121447092.XU CN202121447092U CN217060409U CN 217060409 U CN217060409 U CN 217060409U CN 202121447092 U CN202121447092 U CN 202121447092U CN 217060409 U CN217060409 U CN 217060409U
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Abstract
The application discloses a PFC circuit fault detection device and frequency conversion equipment, wherein the device comprises a fault judgment module and a device detection module which are electrically connected; the fault judgment module is used for acquiring an output voltage value of the PFC circuit and determining whether the PFC circuit fails according to the output voltage of the PFC circuit and a preset reference voltage value; the device detection module is used for detecting a circuit device of the PFC circuit when the fault of the PFC circuit is determined so as to determine a fault device. The method and the device can ensure that when the PFC circuit fails, the electronic device of the PFC circuit is subjected to fault detection and troubleshooting in time, so that the service life of the electronic device is prolonged, and the reliability of the PFC circuit is improved.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a PFC circuit fault detection device and frequency conversion equipment.
Background
The Power Factor (PF) is a relationship between the effective Power and the total Power consumption (apparent Power), and basically, the Power Factor can measure the degree of effective utilization of the electric Power, and when the Power Factor value is larger, it represents that the electric Power utilization rate is higher, and a Power Factor Correction (PFC) circuit can effectively solve the problem of current harmonics existing in the Power electronic equipment, and improves the utilization rate of the electric Power, so that the PF is widely applied to the switching Power supply of the variable frequency air conditioner.
For example, when an abnormal output current waveform of the PFC circuit is detected, it may be determined that the PFC circuit is out of control, such as an inductive short circuit or an Insulated Gate Bipolar Transistor (IGBT) is turned on, so as to trigger a corresponding protection mechanism, and form hardware protection for the PFC circuit.
However, the current detection and protection mechanism can only judge the short circuit of the inductor or the direct connection of the IGBT in the PFC circuit through the output current waveform, and is lacking in the detection and protection mechanism for the working state of other devices in the PFC circuit, and when other devices fail, the failure cannot be detected and protected in time, so that the electronic device is damaged.
SUMMERY OF THE UTILITY MODEL
The application provides a PFC circuit fault detection device and frequency conversion equipment, aims at solving the problem that the electronic device is damaged due to the fact that a detection protection mechanism aiming at the electronic device of a PFC circuit is lacked and the fault of the electronic device cannot be detected in time in the prior art.
In a first aspect, the present application provides a PFC circuit fault detection apparatus, including a fault determination module and a device detection module, which are electrically connected;
the fault judgment module is used for acquiring the output voltage value of the PFC circuit and determining whether the PFC circuit is in fault according to the output voltage value of the PFC circuit and a preset reference voltage value;
the device detection module is used for detecting the circuit device of the PFC circuit when the fault of the PFC circuit is determined so as to determine the fault device.
In a possible implementation manner of the present application, the PFC circuit includes a driving switch device, the device detection module includes a current detection unit, the current detection unit is electrically connected to the driving switch device, the current detection unit is configured to detect a device current value of the driving switch device when determining that the PFC circuit has a fault, and if the device current value is 0, the driving switch device is determined to be a faulty device.
In a possible implementation manner of the present application, the PFC circuit further includes a fast recovery diode, the device detection module further includes a voltage detection unit, the voltage detection unit is electrically connected to the fast recovery diode, the voltage detection unit is configured to detect a device voltage value of the fast recovery diode when determining that the PFC circuit has a fault, and if the device voltage value is 0, the fast recovery diode is determined to be a faulty device.
In a possible implementation manner of the present application, the PFC circuit fault detection apparatus further includes a voltage acquisition module electrically connected to the fault determination module, where the voltage acquisition module is configured to acquire an output voltage value of the PFC circuit and output the acquired output voltage value to the fault determination module.
In a possible implementation manner of the present application, the PFC circuit fault detection apparatus further includes a timing module configured with a determination period, the timing module is configured to enable the voltage acquisition module to acquire an output voltage value in the determination period, and the voltage acquisition module is further configured to obtain a voltage average value according to the output voltage value in the acquisition period, so that the fault determination module determines whether the PFC circuit has a fault according to the voltage average value and a reference voltage value.
In one possible implementation manner of the present application, the fault determining module is further configured with a comparison threshold, and the fault determining module is specifically configured to:
calculating a difference between the output voltage value and the reference voltage value;
and determining whether the PFC circuit fails according to the difference value and the comparison threshold value to obtain a judgment result.
In a possible implementation manner of the present application, the determination result includes a circuit normal result and a circuit fault result, and the fault determination module is further specifically configured to:
comparing the difference value with a comparison threshold value;
if the difference value is larger than the comparison threshold value, determining the fault of the PFC circuit, and obtaining a circuit fault result;
and if the difference is smaller than or equal to the comparison threshold, determining that the PFC circuit is normal, and obtaining a normal circuit result.
In a possible implementation manner of the present application, the PFC circuit fault detection apparatus further includes a reset module, where the reset module is configured to update the output voltage value according to a normal result of the circuit.
In a possible implementation manner of the present application, the PFC circuit fault detection apparatus further includes a protection module, where the protection module is configured to protect the PFC circuit according to a circuit fault result.
In a second aspect, the present application further provides a frequency conversion device, where the frequency conversion device is configured with a switching power supply module, and the switching power supply module includes a PFC circuit and the PFC circuit fault detection apparatus of the first aspect.
In one possible implementation manner of the present application, the inverter device includes an inverter air conditioner or an inverter refrigerator.
From the above, the present application has the following advantageous effects:
1. according to the method and the device, whether the PFC circuit is in fault or not is determined by the fault determination module according to the output voltage value of the PFC circuit and the preset reference voltage value, and when the PFC circuit is determined to be in fault, the circuit device of the PFC circuit is detected by the device detection module, so that the fault device is determined, the condition that in the prior art, only the short circuit of an inductor or the direct connection of an IGBT in the PFC circuit can be determined through the output current waveform is avoided, and the electronic device of the PFC circuit can be timely subjected to fault detection and troubleshooting when the PFC circuit is in fault, so that the service life of the electronic device is prolonged, and the reliability of the PFC circuit is improved.
2. In the application, when a PFC circuit fault is determined, the device current value of the driving switch device is detected through the current detection unit electrically connected with the driving switch device, namely, whether the current flows through the driving switch device is detected, if the device current value is 0, it is determined that the current does not flow through the driving switch device, and then the driving switch device can be judged to be open-circuited, namely, the driving switch device can be determined to be a fault device, the fault detection efficiency of the device is improved, and the accuracy of a detection result is further ensured.
3. In the application, when determining that the PFC circuit has a fault, the voltage detection unit electrically connected with the fast recovery diode detects the device voltage value of the fast recovery diode, namely, the voltages at two ends of the fast recovery diode are detected, if the device voltage value is 0, the short circuit of the fast recovery diode can be judged, and the fast recovery diode can be determined to be a fault device.
4. According to the method and the device, the fault judgment module determines the judgment result according to the comparison of the size relationship between the difference value between the output voltage value and the reference voltage value of the PFC circuit and the comparison threshold value, when the difference value between the output voltage value and the reference voltage value is large, namely the difference value between the output voltage value and the reference voltage value exceeds the comparison threshold value, the PFC circuit is considered to be in fault, otherwise, the PFC circuit is determined to be normal, the working state of the PFC circuit is determined through the comparison of the voltage, the accuracy of the detection result can be ensured, and the reliability of the PFC circuit is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings required for the description of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a PFC circuit in the prior art;
fig. 2 is a schematic structural diagram of a PFC circuit fault detection apparatus provided in an embodiment of the present application;
fig. 3 is another schematic structural diagram of a PFC circuit fault detection apparatus provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of the frequency conversion device provided in the embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Before introducing the PFC circuit fault detection apparatus and the frequency conversion device provided in the present application, a related description is first performed on the PFC circuit mentioned in the present application, as shown in fig. 1, which is a schematic circuit diagram of a PFC circuit in the prior art, and generally, main devices of a Power Factor Correction (PFC) circuit include a Microcontroller (MCU), a driving circuit, an Insulated Gate Bipolar Transistor (IGBT) Q, an inductor L, a fast recovery diode D, and a capacitor C, where the MCU is configured to generate a Pulse Width Modulation (PWM) signal, the inductor L is connected to a rectifier bridge, and an AC voltage signal V _ AC of an AC voltage source (Alternating Current, AC) is rectified by the rectifier bridge to form a dc voltage signal V _ AC db Output to the inductor L, and the PFC circuit adjusts the DC voltage signal V according to the generated PWM signal db To obtain an output voltage V dc The output voltage V is obtained by improving the power factor of the electric equipment, such as an air conditioner dc Can be used to provide operating voltage to load terminals such as compressors and fans.
When the PFC circuit fails, the compressor and the fan cannot work normally, so that in the prior art, there is a protection mechanism for the PFC circuit, if a short-circuit occurs, the output voltage V is output dc Under the condition of no voltage, the MCU is not electrified, so that the MCU has no working state; if the inductor L is short-circuited or the insulated gate bipolar transistor Q is straight-through, conventional current hardware protection can be caused, namely the output current of the PFC circuit can be detected, and when the waveform of the output circuit is abnormal, the fact that the PFC circuit is out of control, such as the inductor L is short-circuited or the insulated gate bipolar transistor Q is straight-through, can be determined, so that a corresponding protection mechanism is triggered, and hardware protection is formed on the PFC circuit. However, the existing detection and protection mechanism can only judge the short circuit of the inductor L or the direct connection of the igbt Q through the output current waveform, and the detection and protection mechanism is not available for the working states of other devices in the PFC circuit, such as the driving circuit, the fast recovery diode, etc., and when the driving circuit, the fast recovery diode, etc., failAnd faults cannot be detected and protected in time, so that electronic devices are easily damaged.
In view of this problem, the present application provides a PFC circuit fault detection apparatus and a frequency conversion device, and the following respectively describes the PFC circuit fault detection apparatus and the frequency conversion device provided in the present application in detail.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a PFC circuit fault detection apparatus according to an embodiment of the present disclosure. The fault detection device for the PFC circuit can comprise a fault judgment module 102 and a device detection module 103 which are electrically connected, wherein the fault judgment module 102 can be used for acquiring an output voltage value of the PFC circuit and determining whether the PFC circuit 100 is in fault according to the output voltage value of the PFC circuit 100 and a preset reference voltage value; the device detection module 103 may be configured to detect a circuit device of the PFC circuit 100 to determine a faulty device when it is determined that the PFC circuit is faulty.
In the embodiment of the present application, the fault determining module 102 may be directly electrically connected to the output terminal of the PFC circuit 100 to obtain the output voltage value (e.g., "V") of the PFC circuit 100 dc ") and then based on the output voltage value V dc The reference voltage value pre-configured by the fault determination module 102 is used to determine whether the PFC circuit 100 is faulty, and specifically, the reference voltage value pre-configured by the fault determination module 102 (e.g., "V dc-ref ") may be an ideal or theoretical value of the output voltage when PFC circuit 100 is operating normally, and thus, reference voltage value V dc-ref The output voltage value V of the PFC circuit 100 may be determined according to the model specification of each electronic device in the actual application scenario, and in an ideal state, the output voltage value V may be considered as the output voltage value V of each electronic device in the PFC circuit 100 dc And a reference voltage value V dc-ref However, since the operation states of the devices do not completely reach the ideal state in the practical application scenario, the output voltage value V is equal to the desired value dc And a reference voltage value V dc-ref Will not be exactly the same, but even the output voltage value V dc And a reference voltage value V dc-ref Will not be completely the same, and output voltage value V dc And a reference voltage value V dc-ref Should also be relatively close in between, i.e. the output voltage value V dc And reference toVoltage value V dc-ref Therefore, in this embodiment, the fault determining module 102 may determine the output voltage value V according to the difference between the output voltage value V and the output voltage value V dc And a reference voltage value V dc-ref The difference therebetween to determine whether PFC circuit 100 is malfunctioning.
In addition, as shown in fig. 2, in some embodiments of the present application, the PFC circuit fault detection apparatus may further include a voltage collecting module 101 electrically connected to the fault determining module 102, where the voltage collecting module 101 may be configured to collect an output voltage value of the PFC circuit 100, and specifically, the voltage collecting module 101 may be electrically connected to both the PFC circuit 100 and the fault determining module 102, and the voltage collecting module 101 may be configured to electrically connect the output voltage value V of the PFC circuit 100 to the fault determining module 102 dc Is transmitted to the fault determination module 102 so that the fault determination module 102 can use the output voltage value V dc And judging the working state of the PFC circuit. Generally, the output voltage output by the PFC circuit is a dc voltage, so in this embodiment, the voltage acquisition module 101 may be an integrated dc voltage collector, or may be a voltage division sampling circuit composed of voltage division resistors, and the type of the voltage acquisition module 101 may be selected according to an actual application scenario, which is not limited herein.
In the embodiment of the present application, the device detecting module 103 may be electrically connected to the failure determining module 102 and the PFC circuit 100, specifically, the failure determining module 102 is according to the output voltage V dc And a reference voltage value V dc-ref After determining that the PFC circuit 100 has a fault, the device detection module 103 may be driven to detect a circuit device in the PFC circuit 100, so as to find a fault cause and a fault device, therefore, when determining that the PFC circuit has a fault, the device detection module 103 may respectively detect the circuit device in the PFC circuit 100, specifically, may determine the working state of the circuit device by detecting electrical characteristic signals of the circuit device, such as voltage, current, and the like, and may determine that the circuit device is a fault device if the electrical characteristic signal of a certain circuit device does not conform to a value in a normal working range.
In the embodiment of the present application, the fault determining module 102 determines whether the PFC circuit 100 fails according to an output voltage value of the PFC circuit 100 and a preset reference voltage value, and when it is determined that the PFC circuit 100 fails, the device detecting module 103 detects a circuit device of the PFC circuit 100, so as to determine a failed device, thereby avoiding a situation that only an inductance short circuit or an IGBT direct connection in the PFC circuit 100 can be determined through an output current waveform in the prior art, and being capable of ensuring that when the PFC circuit 100 fails, a fault of an electronic device of the PFC circuit 100 is detected and investigated in time, thereby prolonging a service life of the electronic device, and improving reliability of the PFC circuit.
As shown in fig. 3, which is another schematic structural diagram of the PFC circuit fault detection apparatus provided in this embodiment, in some embodiments of the present application, the PFC circuit 100 may include a driving switch device, the device detection module 103 may include a current detection unit 1031, the current detection unit 1031 is electrically connected to the driving switch device, and the current detection unit 1031 may be configured to detect a device current value of the driving switch device when determining that the PFC circuit is faulty, and determine that the driving switch device is a faulty device if the device current value is 0. Specifically, in this embodiment of the application, the driving switch device may be the driving circuit and the insulated gate bipolar transistor Q as shown in fig. 1, when it is determined that the PFC circuit fails, the current detection unit 1031 may detect device current values of the driving circuit and the insulated gate bipolar transistor Q, respectively, and determine the operating states of the driving circuit and the insulated gate bipolar transistor Q by detecting whether current flows through the driving circuit and the insulated gate bipolar transistor Q; for example, if the device current value of the driving circuit is 0 and the igbt Q is not 0, it may be determined that no current flows through the driving circuit, and a current flows through the igbt Q, that is, it may be considered that the driving circuit is in an open circuit state, and at this time, it may be determined that the driving circuit is a faulty device; if the device current value of the insulated gate bipolar transistor Q is 0, it can be determined that no current flows through the insulated gate bipolar transistor Q, that is, the insulated gate bipolar transistor Q is in an open circuit state, and therefore, it can be determined that the insulated gate bipolar transistor Q is a faulty device. In this embodiment, the current detecting unit 1031 may adopt any current collecting device or current sampling circuit, which is not limited herein.
In the embodiment of the present application, when determining that the PFC circuit 100 has a fault, the current detection unit 1031 electrically connected to the driving switch device detects a device current value of the driving switch device, that is, detects whether a current flows through the driving switch device, and if the device current value is 0, determines that no current flows through the driving switch device, and further may determine that the driving switch device is open, that is, may determine that the driving switch device is a faulty device, thereby improving the fault detection efficiency for the device, and further ensuring the accuracy of the detection result.
Referring to fig. 3, in some embodiments of the present application, the PFC circuit 100 may further include a fast recovery diode, for example, the fast recovery diode D shown in fig. 1, the device detection module 103 may further include a voltage detection unit 1032, the voltage detection unit 1032 is electrically connected to the fast recovery diode D, the voltage detection unit 1032 may be configured to detect a device voltage value of the fast recovery diode D when determining that the PFC circuit has a fault, and determine that the fast recovery diode D is a faulty device if the device voltage value is 0. Specifically, when determining that the PFC circuit has a fault, the device detection module 103 may further detect the device voltage values at two ends of the fast recovery diode D through the voltage detection unit 1032 electrically connected to the fast recovery diode D, if the device voltage value is within a normal range, the fast recovery diode D may be considered as a normal operating state, and if the device voltage value is 0, the fast recovery diode D may be considered as a short-circuit state, and then the fast recovery diode D is determined as a faulty device. In this embodiment of the application, the voltage detection unit 1032 may adopt any one of the existing voltage acquisition devices or voltage sampling circuits, and may also adopt the voltage acquisition module 101 to detect the voltage value of the device, which is not limited herein.
In the embodiment of the present application, when determining that the PFC circuit 100 fails, the voltage detection unit 1032 electrically connected to the fast recovery diode D detects a device voltage value of the fast recovery diode D, that is, detects voltages at two ends of the fast recovery diode D, and if the device voltage value is 0, it may be determined that the fast recovery diode D is in a short circuit, that is, it may be determined that the fast recovery diode D is a failed device, which also improves the failure detection efficiency for the device, and further ensures the accuracy of the detection result.
Referring to fig. 3, in some embodiments of the present application, the PFC circuit fault detection apparatus may further include a timing module 106 configured with a determination period, where the timing module 106 may be configured to enable the voltage acquisition module 101 to acquire an output voltage value in the determination period, and the voltage acquisition module 101 is further configured to obtain a voltage average value according to the output voltage value in the acquisition period, so that the fault determination module 102 determines whether the PFC circuit 100 is faulty according to the voltage average value and the reference voltage value. Specifically, in the embodiment of the present application, the output voltage value compared with the reference voltage value may be an output voltage value at a certain time, or may be a voltage average value (for example, "V") of the output voltage values collected in the determination period dc-avg ") and passes through a voltage mean value V dc-avg And a reference voltage value V dc-ref And the accuracy of the detection result can be further improved by comparison.
Specifically, the fault determining module 102 may be configured with a comparison threshold (e.g., "Δ V"), and the determination result may include a circuit normal result and a circuit fault result, and the fault determining module 102 may specifically be configured to: calculating a difference between the output voltage value and the reference voltage value; determining whether the PFC circuit fails according to the difference value and a comparison threshold value to obtain a judgment result, wherein specifically, the difference value and the comparison threshold value are compared; if the difference value is larger than the comparison threshold value, determining the fault of the PFC circuit, and obtaining a circuit fault result; and if the difference is smaller than or equal to the comparison threshold, determining that the PFC circuit is normal, and obtaining a normal circuit result.
In the embodiment of the present application, the output voltage value is selected as the voltage average value V dc-avg Since PFC circuit 100 is typically a BOOST circuit, reference voltage value V dc-ref The voltage value is output by the PFC circuit under the ideal state, therefore, the reference voltage value V can be calculated dc-ref And the voltage mean value V dc-avg The absolute value of the difference is then compared with a comparison threshold av if the absolute value of the difference | V dc-ref -V dc-avg If | is greater than the comparison threshold Δ V, the reference voltage value V can be considered as dc-ref And the voltage mean value V dc-avg The difference is large, so that the PFC circuit 100 can be determined not to be in a normal working state, namely the PFC circuit 100 fails, and a circuit failure result is obtained; otherwise, if the absolute value of the difference is | V dc-ref -V dc-avg If | is smaller than or equal to the comparison threshold Δ V, it may be determined that the PFC circuit 100 is normal, and a circuit normal result is obtained.
As shown in fig. 3, in some embodiments of the present application, the PFC circuit fault detection apparatus may further include a reset module 107 electrically connected to the voltage acquisition module 101 and the fault determination module 102, respectively, where the reset module 107 may be configured to update the output voltage value according to a normal circuit result, specifically, if the determination result obtained by the fault determination module 102 is a normal circuit result, it indicates that the PFC circuit 100 is in a normal working state in the current determination cycle, and therefore, the reset module 107 may update and reset the output voltage value received by the voltage acquisition module 101, so that the voltage acquisition module 101 performs acquisition of the output voltage value and calculation of the voltage average value in the next determination cycle.
In addition, in some embodiments of the present application, the PFC circuit failure detection apparatus may further include a result storage unit 104 electrically connected to the current detection unit 1031 and the voltage detection unit 1032, respectively, and a protection module 105 electrically connected to the result storage unit 104, specifically, the result storage unit 104 may be configured to store a detection result of the current detection unit 1031 regarding an operation state of the driving switching device, such as the driving circuit and the igbt Q, and a detection result of the voltage detection unit 1032 regarding an operation state of the fast recovery diode D, wherein the detection result of the operation state stored in the result storage unit 104 may be a normal operation result or a device failure result, and the result storage unit 104 may further send the device failure result in the detection results to the protection module 105 to drive the protection module 105 to correspondingly protect the PFC circuit 100 according to the received device failure result, for example, a power supply device for supplying power to the PFC circuit 100 is turned off or a protection operation such as power-off is performed on the entire electric device.
Fig. 4 is a schematic structural diagram of the frequency conversion device provided in the embodiment of the present application. On the basis of the foregoing embodiments, the present application further provides an inverter device 400, where the inverter device 400 may be configured with a switching power supply module 401, and the switching power supply module 401 may include the PFC circuit 100 and the PFC circuit fault detection apparatus of the first aspect, specifically, the inverter device 400 may be an electrical device such as a variable frequency air conditioner or a variable frequency refrigerator, and the PFC circuit fault detection apparatus may be configured to detect an operating state of the PFC circuit 100 and an operating state of a circuit device in the PFC circuit 100, so as to perform fault protection on the circuit device and the PFC circuit, thereby ensuring normal operation of the switching power supply module 401 and the inverter device 400, and improving reliability of the inverter device 400.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as the same entity or several entities, and specific implementation of each unit or structure may refer to the foregoing embodiment, which is not described herein again.
The PFC circuit fault detection apparatus and the frequency conversion device provided in the present application are introduced in detail, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the above description is only used to help understand the circuit and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A PFC circuit fault detection device is characterized by comprising a fault judgment module and a device detection module which are electrically connected;
the fault judgment module is used for acquiring an output voltage value of the PFC circuit and determining whether the PFC circuit is in fault according to the output voltage value and a preset reference voltage value;
the device detection module is used for detecting the circuit device of the PFC circuit when the PFC circuit is determined to be in fault so as to determine a fault device.
2. The apparatus according to claim 1, wherein the PFC circuit comprises a driving switch device, the device detection module comprises a current detection unit, the current detection unit is electrically connected to the driving switch device, the current detection unit is configured to detect a device current value of the driving switch device when it is determined that the PFC circuit has a fault, and determine that the driving switch device is the faulty device if the device current value is 0.
3. The apparatus according to claim 1, wherein the PFC circuit further comprises a fast recovery diode, the device detection module further comprises a voltage detection unit, the voltage detection unit is electrically connected to the fast recovery diode, the voltage detection unit is configured to detect a device voltage value of the fast recovery diode when it is determined that the PFC circuit has a fault, and determine that the fast recovery diode is the faulty device if the device voltage value is 0.
4. The device according to claim 1, further comprising a voltage collecting module electrically connected to the fault determining module, wherein the voltage collecting module is configured to collect the output voltage value of the PFC circuit and output the collected output voltage value to the fault determining module.
5. The device according to claim 4, further comprising a timing module configured with a determination period, wherein the timing module is configured to enable the voltage acquisition module to acquire the output voltage value in the determination period, and the voltage acquisition module is further configured to obtain a voltage average value according to the output voltage value in the acquisition period, so that the fault determination module determines whether the PFC circuit is faulty according to the voltage average value and the reference voltage value.
6. The apparatus according to claim 1, wherein the fault determining module is further configured with a comparison threshold, and the fault determining module is specifically configured to:
calculating a difference between the output voltage value and the reference voltage value;
and determining whether the PFC circuit fails according to the difference value and the comparison threshold value to obtain a judgment result.
7. The apparatus according to claim 6, wherein the determination result comprises a circuit normal result and a circuit fault result, and the fault determining module is further configured to:
comparing the difference value to the comparison threshold;
if the difference value is larger than the comparison threshold value, determining the PFC circuit fault to obtain a circuit fault result;
and if the difference is smaller than or equal to the comparison threshold, determining that the PFC circuit is normal, and obtaining a normal circuit result.
8. The PFC circuit fault detection apparatus of claim 7, further comprising a reset module configured to update the output voltage value according to a normal result of the circuit.
9. The PFC circuit fault detection apparatus of claim 1, further comprising a protection module configured to protect the PFC circuit according to the circuit fault result.
10. A frequency conversion device, characterized in that the frequency conversion device is provided with a switching power supply module, the switching power supply module comprising a PFC circuit and the PFC circuit fault detection apparatus of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121447092.XU CN217060409U (en) | 2021-06-28 | 2021-06-28 | PFC circuit fault detection device and frequency conversion equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121447092.XU CN217060409U (en) | 2021-06-28 | 2021-06-28 | PFC circuit fault detection device and frequency conversion equipment |
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| CN217060409U true CN217060409U (en) | 2022-07-26 |
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| CN202121447092.XU Active CN217060409U (en) | 2021-06-28 | 2021-06-28 | PFC circuit fault detection device and frequency conversion equipment |
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| CN (1) | CN217060409U (en) |
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