CN217060408U - 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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Abstract
The application discloses a PFC circuit fault detection device and frequency conversion equipment, wherein the device comprises a fault analysis module and a device troubleshooting module which are electrically connected; the fault analysis module is used for acquiring an alternating current signal of the PFC circuit and determining whether the PFC circuit has a fault according to the alternating current signal of the PFC circuit and a preset power frequency; the device checking module is used for detecting the circuit devices of the PFC circuit when determining that the PFC circuit is in fault so as to determine the fault devices. 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 an effective Power and a total Power consumption (apparent Power), and basically, the Power Factor can measure the degree of effective utilization of 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 Power electronic equipment, and improve the utilization rate of electric energy, and thus, is widely applied to a switching Power supply of a variable frequency air conditioner.
For example, when an output current waveform of the PFC circuit is detected to be abnormal, it may be determined that the PFC circuit is out of control, such as an inductor short circuit or an Insulated Gate Bipolar Transistor (IGBT) is turned on, so as to trigger a corresponding protection mechanism, thereby forming hardware protection on the PFC circuit.
However, the existing detection protection mechanism can only judge the condition of inductance short circuit or IGBT through connection in the PFC circuit through the output current waveform, and is lack of a 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 analysis module and a device troubleshooting module, which are electrically connected;
the fault analysis module is used for acquiring an alternating current signal of the PFC circuit and determining whether the PFC circuit has a fault according to the alternating current signal of the PFC circuit and a preset power frequency;
and the device checking module is used for detecting the circuit devices of the PFC circuit to determine the fault devices when the fault of the PFC circuit is determined.
In a possible implementation manner of the present application, the PFC circuit includes a driving switch device, the device troubleshooting 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 troubleshooting 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 current collection module electrically connected to the fault analysis module, where the current collection module is configured to collect an alternating current signal of the PFC circuit and output the collected alternating current signal to the fault analysis module.
In a possible implementation manner of the present application, the PFC circuit fault detection apparatus further includes a timing module configured with a sampling period, where the timing module is configured to enable the current collection module to collect an alternating current signal in the sampling period, and the current collection module is further configured to obtain an alternating current signal set according to the alternating current signal in the collection period, so that the fault analysis module determines whether the PFC circuit is faulty according to the alternating current signal set and the power frequency.
In a possible implementation manner of the present application, the fault analysis module is configured with a fundamental component threshold, and the fault analysis module is specifically configured to:
analyzing the alternating current signal set and the power frequency by a time domain and frequency domain transformation analysis method to obtain a current fundamental component;
and determining whether the PFC circuit has a fault according to the current fundamental component and the fundamental component threshold value to obtain an analysis result.
In a possible implementation manner of the present application, the analysis result includes a circuit normal result and a circuit fault result, and the fault analysis module is further specifically configured to:
comparing the current fundamental component with a fundamental component threshold;
if the current fundamental component is smaller than the fundamental component threshold value, determining the fault of the PFC circuit and obtaining a circuit fault result;
and if the current fundamental component is greater than or equal to the fundamental component threshold value, 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 alternating current signal set 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 when determining that the PFC circuit has a fault.
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.
As can be seen from the above, the present application has the following advantageous effects:
1. in the application, the fault analysis module determines whether the PFC circuit is in fault according to an alternating current signal of the PFC circuit and a preset power frequency, and after the fault of the PFC circuit is determined, the device troubleshooting module detects a circuit device of the PFC circuit again, so that the fault device is determined, the condition that in the prior art, only an inductance short circuit or an IGBT direct connection in the PFC circuit can be judged through an output current waveform is avoided, and the fault detection and troubleshooting can be timely carried out on an electronic device of the PFC circuit 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. In the application, the fault analysis module determines an analysis result according to a comparison of a magnitude relation between a fundamental component and a fundamental component threshold of an alternating current signal of the PFC circuit, when a fundamental component of the current is smaller than the fundamental component threshold, the PFC circuit can be considered to be faulty, otherwise, the PFC circuit is determined to be normal, and the working state of the PFC circuit is determined by comparing the magnitude of the fundamental component of the current with the magnitude of the fundamental component threshold, so that 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 drawings in the present application, and it should be apparent 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", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered limiting of 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 to implicitly indicate 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 given to 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 composed of four diodes, and an Alternating voltage signal V _ AC of an Alternating Current (AC) voltage source is rectified by the rectifier bridge to form a direct 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 for providing working voltage for load end such as compressor and blower fan, and corresponding AC current signal (such as 'I') in form of sine wave of AC voltage source AC ac ") is rectified by a rectifier bridge to obtain the alternating current I of the PFC circuit db The alternating current I db For an alternating current signal I ac Absolute value of (b), then the alternating current I db The waveform of (A) is steamed bread wave.
When the PFC circuit fails, the compressor and the fan cannot normally operate, and therefore, in the prior art, there is a protection mechanism for the PFC circuit if a short-circuit ac voltage V occurs dc Under the condition of no voltage, the MCU is not electrified, so that the MCU has no working state; if an inductor L short circuit or an insulated gate bipolar transistor Q direct connection occurs, 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 PFC can be determinedIf the circuit is out of control, the short circuit of the inductor L or the direct connection of the insulated gate bipolar transistor Q occurs, so that a corresponding protection mechanism is triggered, and the hardware protection is formed on the PFC circuit. However, the conventional 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 is short of the detection and protection mechanism for the working states of other devices in the PFC circuit, such as the driving circuit and the fast recovery diode, and when the driving circuit and the fast recovery diode fail, the failure cannot be detected and protected in time, so that the electronic device is 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 analysis module 102 and a device troubleshooting module 103 which are electrically connected, wherein the fault analysis module 102 can be used for acquiring an alternating current signal of the PFC circuit and determining whether the PFC circuit 100 fails according to the alternating current signal of the PFC circuit 100 and a preset power frequency; the device troubleshooting module 103 may be configured to detect a circuit device of the PFC circuit 100 to determine a faulty device when determining that the PFC circuit is faulty.
In the embodiment of the present application, the fault analysis module 102 may be directly electrically connected to the AC voltage source AC of the PFC circuit, or directly electrically connected to a connection between the rectifier bridge and the inductor L, and if the fault analysis module 102 is electrically connected to the AC voltage source AC, the AC current signal of the PFC circuit 100 of the embodiment of the present application is an AC current signal (for example, "I" output by the AC voltage source AC) output by the AC voltage source AC ac "), if the fault analysis module 102 is electrically connected to the junction of the rectifier bridge and the inductor L, the ac current signal is the ac current signal I ac The output current, i.e. alternating current I, being obtained after rectification db Due to an alternating current signal I ac The waveform of (A) is a sine wave, alternating current I db The waveform of the voltage is steamed bread wave and current valueSince each of the signals varies with time, in the embodiment of the present application, the ac current signal for determining whether or not the PFC circuit 100 has failed is actually an ac current value that is a time value on a current waveform.
The power frequency generally refers to a rated frequency adopted by power generation, power transmission, power transformation and distribution equipment of a power system and industrial and civil electrical equipment, and is in hertz HZ, and in China, under a common condition, the power frequency is 50HZ, and also 60HZ, and in this embodiment, the power frequency is set to be 50 HZ. Specifically, the power frequency and the ac current signal pre-configured by the fault analysis module 102 may obtain a fundamental component in the ac current signal through time domain and frequency domain transform analysis, and determine whether the PFC circuit 100 has a fault according to the fundamental component.
In addition, as shown in fig. 2, in some embodiments of the present application, the PFC circuit fault detection apparatus may further include a current collection module 101 electrically connected to the fault analysis module 102, where the current collection module 101 may be configured to collect an alternating current signal of the PFC circuit 100, and specifically, the current collection module 101 may be electrically connected to both the PFC circuit 100 and the fault analysis module 102, respectively, and the current collection module 101 may enable the alternating current I of the PFC circuit 100 to be obtained through the current collection module 101 dc To the fault analysis module 102 so that the fault analysis module 102 utilizes the alternating current I dc And judging the working state of the PFC circuit. In the embodiment of the present application, the current collection module 101 may be an integrated ac current collector, or may be a current collection circuit, and the type of the current collection module 101 may be selected according to an actual application scenario, and is not limited herein.
In the embodiment of the present application, the device troubleshooting module 103 may be electrically connected to the fault analysis module 102 and the PFC circuit 100, specifically, the fault analysis module 102 is according to the ac current I dc After the power frequency determines that the PFC circuit 100 has a fault, the device troubleshooting module 103 may be driven to detect the circuit devices in the PFC circuit 100, so as to find out the cause of the fault and the faulty devices, and therefore, the device troubleshooting module 103 may detect the circuit devices in the PFC circuit 100, specifically, the device troubleshooting module 103 may detect the circuit devices in the PFC circuit 100 separatelyThe working state of the circuit device can be judged by detecting the electric characteristic signals of the circuit device, such as voltage, current and the like, and if the electric characteristic signal of a certain circuit device does not accord with the value in the normal working range, the circuit device can be determined to be a fault device.
In the embodiment of the present application, the fault analysis module 102 determines whether the PFC circuit 100 fails according to an alternating current signal of the PFC circuit 100 and a power frequency pre-configured for the alternating current signal, and after determining that the PFC circuit 100 fails, the device troubleshooting module 103 detects a circuit device of the PFC circuit 100 again, 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 by an output current waveform in the prior art, and being capable of ensuring that when the PFC circuit 100 fails, a fault detection and a troubleshooting are performed on an electronic device of the PFC circuit 100 in time, thereby prolonging a service life of the electronic device and improving reliability of the PFC circuit.
As shown in fig. 3, for another schematic structural diagram of the PFC circuit fault detection apparatus provided in this embodiment, in some embodiments of this application, the PFC circuit 100 may include a driving switch device, the device checking module 103 may include a current detection unit 1031, the current detection unit 1031 is electrically connected to the driving switch device, 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 determining that the PFC circuit has a fault, 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, the driving circuit may be considered to be 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 it is determined that the PFC circuit 100 has a fault, the current detection unit 1031 electrically connected to the driving switch device detects the 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, it is determined that no current flows through the driving switch device, and it may be determined that the driving switch device is open, that is, it may be determined that the driving switch device is a faulty device, so that the fault detection efficiency for the device is improved, and the accuracy of the detection result is further ensured.
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 checking 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 fails, and if the device voltage value is 0, the fast recovery diode D is determined to be a failed device. Specifically, when it is determined that the PFC circuit has a fault, the voltage detection unit 1032 electrically connected to the fast recovery diode D may further detect a device voltage value at two ends of the fast recovery diode D, if the device voltage value is within a normal range, the fast recovery diode D may be considered as being in a normal working state, and if the device voltage value is 0, the fast recovery diode D may be considered as being in 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 current 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 sampling period, where the timing module 106 may be configured to enable the current collection module 101 to collect an alternating current signal in the sampling period, and the current collection module 101 is further configured to obtain an alternating current signal set according to the alternating current signal in the collection period, so that the fault analysis module 102 determines whether the PFC circuit 100 is faulty according to the alternating current signal set and the power frequency. Specifically, in the embodiment of the present application, the alternating current signal set of the alternating current signal collected in the sampling period may be an array formed by time values of the alternating current signal in the sampling period, and the fault of the PFC circuit 100 is determined through the alternating current signal set, so that the accuracy of the detection result may be further improved.
Specifically, the fault analysis module 102 may be configured with a fundamental component threshold, the analysis result may include a circuit normal result and a circuit fault result, and the fault analysis module 102 may specifically be configured to: analyzing the alternating current signal set and the power frequency by a time domain and frequency domain transformation analysis method to obtain a current fundamental component; determining whether the PFC circuit fails according to the current fundamental component and a fundamental component threshold value to obtain an analysis result, wherein specifically, the current fundamental component and the fundamental component threshold value are compared; if the current fundamental component is smaller than the fundamental component threshold value, determining the fault of the PFC circuit and obtaining a circuit fault result; and if the current fundamental component is greater than or equal to the fundamental component threshold value, determining that the PFC circuit is normal and obtaining a normal circuit result.
Due to sine waves andthe alternating current signals of the steamed bread waves can be used for the time domain and frequency domain transformation analysis method, and the obtained results are the same, so that in the embodiment of the application, the alternating current signal set is selected as the alternating current signal set [ I db ]The fundamental component threshold may be a fundamental component of current in the ac current signal when the PFC circuit 100 operates under an ideal condition, and therefore, in the embodiment of the present application, the ac current signal set [ I ] is first analyzed by a time domain and frequency domain transform analysis method db ]And power frequency to obtain current fundamental component, wherein the time domain and frequency domain Transform analysis method can be Fast Fourier Transform (FFT), and the FFT function is used for collecting AC current signal at power frequency db ]Analyzing to obtain a current fundamental component (such as 'rho I1'), comparing the current fundamental component rho I1 with a fundamental component threshold, and if the current fundamental component rho I1 is smaller than the fundamental component threshold, determining that the PFC circuit 100 is not in a normal operation state, namely the PFC circuit 100 is in a fault, so as to obtain a circuit fault result; on the contrary, if the current fundamental component ρ I1 is greater than or equal to the fundamental component threshold, it may be determined that the PFC circuit 100 is normal, and a circuit normal result is obtained, specifically, in this embodiment, the fundamental component threshold may be set to a numerical value of 95%, 98%, and the like, and the specific fundamental component threshold may be set according to an actual application scenario, which is not limited herein.
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 current collection module 101 and the fault analysis module 102, respectively, where the reset module 107 may be configured to update the alternating current signal according to a normal circuit result, specifically, if an analysis result obtained by the fault analysis module 102 is a normal circuit result, that is, it indicates that the PFC circuit 100 is in a normal working state in a current sampling period, so that the reset module 107 may update and reset the alternating current signal received by the current collection module 101, so that the current collection module 101 performs collection of the alternating current signal in a next sampling period and calculation of an alternating current signal set.
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 operating state of the driving switch device, such as the driving circuit and the igbt Q, and a detection result of the voltage detection unit 1032 regarding an operating state of the fast recovery diode D, wherein the detection result of the operating state stored by the result storage unit 104 may be a normal operating 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 that supplies power to the PFC circuit 100 is turned off or a protection operation such as a power-off operation is performed on the entire power consumption device.
Fig. 4 is a schematic structural diagram of a frequency conversion device provided in the embodiment of the present application. On the basis of the foregoing embodiment, 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 operations of the switching power supply module 401 and the inverter device 400, and improving reliability of the inverter device 400.
In the foregoing 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, which 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 above, and specific examples are applied in the present application to explain the principles and embodiments 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, there may be variations in the specific embodiments and the application scope, 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 analysis module and a device troubleshooting module which are electrically connected;
the fault analysis module is used for acquiring an alternating current signal of the PFC circuit and determining whether the PFC circuit has a fault according to the alternating current signal and a preset power frequency;
the device checking 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 the fault device.
2. The apparatus according to claim 1, wherein the PFC circuit comprises a driving switch device, the device troubleshooting 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 if the device current value is 0, it is determined that the driving switch device is the faulty device.
3. The apparatus according to claim 1, wherein the PFC circuit further includes a fast recovery diode, the device troubleshooting 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 it is determined that the PFC circuit has a fault, and if the device voltage value is 0, it is determined that the fast recovery diode is the faulty device.
4. The PFC circuit fault detection device of claim 1, further comprising a current collection module electrically connected to the fault analysis module, wherein the current collection module is configured to collect the ac current signal of the PFC circuit and output the collected ac current signal to the fault analysis module.
5. The device according to claim 4, further comprising a timing module configured with a sampling period, wherein the timing module is configured to enable the current collection module to collect the alternating current signal in the sampling period, and the current collection module is further configured to obtain an alternating current signal set according to the alternating current signal in the sampling period, so that the fault analysis module determines whether the PFC circuit is faulty according to the alternating current signal set and the power frequency.
6. The PFC circuit fault detection device of claim 5, wherein the fault analysis module is configured with a fundamental component threshold, and the fault analysis module is specifically configured to:
analyzing the alternating current signal set and the power frequency by a time domain and frequency domain transformation analysis method to obtain a current fundamental component;
and determining whether the PFC circuit fails according to the current fundamental component and the fundamental component threshold value to obtain an analysis result.
7. The apparatus according to claim 6, wherein the analysis result comprises a circuit normal result and a circuit fault result, and the fault analysis module is further configured to:
comparing the current fundamental component to the fundamental component threshold;
if the current fundamental component is smaller than the fundamental component threshold value, determining the PFC circuit fault to obtain a circuit fault result;
and if the current fundamental component is larger than or equal to the fundamental component threshold value, 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 set of alternating current signals according to the circuit normal result.
9. The PFC circuit fault detection apparatus of claim 1, further comprising a protection module configured to protect the PFC circuit when it is determined that the PFC circuit is faulty.
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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| CN202121447069.0U CN217060408U (en) | 2021-06-28 | 2021-06-28 | PFC circuit fault detection device and frequency conversion equipment |
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| CN202121447069.0U CN217060408U (en) | 2021-06-28 | 2021-06-28 | PFC circuit fault detection device and frequency conversion equipment |
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