CN111952946B - Surge current suppression circuit, control method and device and electronic equipment - Google Patents
Surge current suppression circuit, control method and device and electronic equipment Download PDFInfo
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- CN111952946B CN111952946B CN201910403213.1A CN201910403213A CN111952946B CN 111952946 B CN111952946 B CN 111952946B CN 201910403213 A CN201910403213 A CN 201910403213A CN 111952946 B CN111952946 B CN 111952946B
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Abstract
The embodiment of the application discloses a surge current suppression circuit, a control method, a device and electronic equipment. The circuit comprises: the device comprises an AC (alternating current) power supply, a relay switch, a protective resistor connected with the relay switch in parallel, a rectifier bridge, a filter capacitor, an AC voltage detection module, a capacitor voltage detection module and a controller; the controller is used for controlling the on-off of the relay switch according to the input voltage information of the alternating current power supply, the voltage information of the filter capacitor, the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge, which are received in real time, so as to restrain surge current when the input voltage is at a peak value. According to the technical scheme, when the input voltage is at the peak value, whether the filter capacitor is full or not is judged, so that whether the relay switch is conducted or not is determined, the surge current generated when the peak value of the power grid is suppressed, and the more comprehensive surge current suppression of the circuit is realized.
Description
Technical Field
The embodiment of the application relates to the technical field of circuit protection, in particular to a surge current suppression circuit, a control method and a control device and electronic equipment.
Background
With the development and progress of the full-direct-current frequency conversion technology, the application of the full-direct-current frequency conversion technology in household appliances is more and more extensive. The direct current frequency conversion board is used as the core of the direct current frequency conversion technology, and a circuit of the direct current frequency conversion board often has a capacitor with a larger capacity as a filtering energy storage element. After the capacitors are kept still for a long time, internal charges can be slowly consumed to reach the condition close to no voltage, and when the direct current frequency conversion plate is electrified again, very large charging current can be generated to form surge current between an external power grid and the capacitors of the frequency conversion plate. On one hand, the surge current can affect the stability of the power grid, further affect the normal use of other equipment in the power grid and even cause the burning of equipment circuits; on the other hand, the bridge rectifier of the direct current frequency conversion plate can be burnt, and discharge is generated at the accessory of the wiring terminal, so that the risk of fire is caused.
In view of the above problems, in a current dc converter circuit, a large number of PTC elements, power resistors or thyristor devices are used as power-on bypass elements to suppress power-on surge current. Referring to fig. 1, in the conventional surge suppression circuit, when the power is turned on, the MCU controls the driving circuit to drive the relay S1 to be turned off, the current is suppressed by the relay R1, so that the capacitor is slowly charged, and when the MCU calculates that the capacitor is approximately full of voltage, the relay, the bypass R1 and the dc frequency conversion board are turned on to operate normally. The relay is turned on in a delayed mode, and the suppression of the electrifying surge current of the direct current frequency conversion plate is realized in a mode of turning on the relay S1 in a delayed mode. However, in the conventional power-on surge current suppression circuit, the MCU only roughly estimates that the capacitor is almost full, and since the peak value of the input voltage of the circuit and the current storage voltage of the capacitor cannot be detected, there is no way to turn on the relay S1 exactly when the capacitor is full. At this time, if the relay S1 is just turned on at the peak of the power grid, since a large potential difference still exists between the input peak of the power grid and the voltage currently stored in the capacitor, a large surge current still occurs at this time, and the stability of the power grid is further affected.
Disclosure of Invention
The embodiment of the application provides a surge current suppression circuit, a control method, a control device and electronic equipment, which can avoid the situation that surge current is generated when a power grid is in a peak value state.
In a first aspect, an embodiment of the present application provides an inrush current suppression circuit, including:
the device comprises an alternating current power supply, a relay switch, a protective resistor connected with the relay switch in parallel, a rectifier bridge, a filter capacitor, an alternating current voltage detection module, a capacitor voltage detection module and a controller;
the first end of the alternating current power supply is connected with the first end of the output loop of the relay switch, the second end of the output loop of the relay switch is connected with the first alternating current end of the rectifier bridge, and the input loop of the relay switch is connected with the control output end of the controller; two ends of the filter capacitor are respectively connected with a first direct current end and a second direct current end of the rectifier bridge, and a second end of the alternating current power supply is connected with a second alternating current end of the rectifier bridge; the controller is in signal connection with the alternating voltage detection module and the capacitor voltage detection module, the alternating voltage detection module is used for collecting input voltage information of the alternating current power supply in real time, and the capacitor voltage detection module is used for collecting voltage information of the filter capacitor in real time;
the controller is used for controlling the on-off of the relay switch according to the input voltage information of the alternating current power supply, the voltage information of the filter capacitor, the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge, which are received in real time, so as to restrain surge current when the input voltage is at the peak value.
In a second aspect, an embodiment of the present application provides a control method for an inrush current suppression circuit, where a controller is used to implement the control method, where the control method includes:
acquiring input voltage information of an alternating current power supply and voltage information of a filter capacitor in real time;
when the input voltage of the alternating current power supply is detected to be at the peak value, according to prestored voltage drop information of a protection resistor and voltage drop information of a rectifier bridge, if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak value input voltage of the alternating current power supply, a relay switch is controlled to be conducted to bypass the protection resistor.
Preferably, after the controlling the relay switch to be turned on to bypass the protection resistor, the method further includes: and according to the input voltage information of the AC power supply acquired in real time, if judging that the input voltage is disconnected, controlling to close a rear-stage load and disconnecting the relay switch.
Preferably, the judgment that the input voltage is disconnected is based on that the controller continuously detects that the peak input voltages of two periods are both 0, and the judgment is that the input voltage is disconnected.
Preferably, the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge are obtained by matching voltage drop parameter information of the corresponding device with actual test correction.
In a third aspect, an embodiment of the present application provides a control device of an inrush current suppression circuit, including:
the acquisition module is used for acquiring input voltage information of the alternating current power supply and voltage information of the filter capacitor in real time;
and the conduction module is used for controlling the relay switch to be conducted to bypass the protection resistor if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak input voltage of the alternating current power supply according to prestored voltage drop information of the protection resistor and voltage drop information of the rectifier bridge when the input voltage of the alternating current power supply is detected to be at the peak value.
Preferably, the power supply further comprises a circuit breaking module, which is used for controlling to close the rear-stage load and to break the relay switch if the input voltage is judged to be disconnected according to the input voltage information of the ac power supply collected in real time.
Preferably, the conduction module includes a determination unit configured to determine that the input voltage is turned off when the controller continuously detects that the peak input voltages of two cycles are both 0.
Preferably, the conduction module further includes a pre-storing unit, configured to obtain pre-stored voltage drop information of the protection resistor and voltage drop information of the rectifier bridge according to voltage drop parameter information of the corresponding device and by matching with actual test correction.
In a fourth aspect, an embodiment of the present application provides an electronic device, including an inrush current suppression circuit, where the inrush current suppression circuit is configured to suppress an electrification inrush current of a dc converter board, and the inrush current suppression circuit is the inrush current suppression circuit according to the first aspect.
This application embodiment is through the input voltage information of real-time collection alternating current power supply and filter capacitor's voltage information, combines the voltage drop information of the protective resistance who prestores and rectifier bridge's voltage drop information, when input voltage is in the peak value, judges filter capacitor whether full of to this decides whether relay switch switches on, surge current who produces when restraining the electric wire netting peak value, realizes restraining the more comprehensive surge current of circuit, avoids surge current to influence circuit safety.
Drawings
FIG. 1 is a prior art electrical surge current suppression circuit diagram;
fig. 2 is a schematic diagram of an inrush current suppression circuit according to a first embodiment of the present application;
fig. 3 is a schematic flowchart of a control method of an inrush current suppression circuit according to a second embodiment of the present application;
FIG. 4 is a schematic diagram of the peak input voltage of the second embodiment of the present application;
FIG. 5 is a schematic diagram of the peak input voltage at the second breakpoint of the embodiment of the present application;
fig. 6 is a schematic structural diagram of a control device of an inrush current suppression circuit according to a third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present application are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but could have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, subprograms, and the like.
The application provides a surge current suppression scheme, mainly be applied to full direct current frequency conversion equipment on, aim at realizing full direct current frequency conversion circuit's surge current suppression. Whether the filter capacitor is full of is judged through detection, whether the relay switch is switched on is judged through the judgment, and when the relay switch is switched on, the situation that the peak value input voltage and the current stored voltage of the capacitor have large potential difference due to the fact that the input voltage is at the peak value and the voltage of the filter capacitor is too low, and then surge current is caused is avoided. Referring to fig. 1, in the surge suppression circuit of the conventional dc converter board, only the power-on surge current is suppressed, and whether the capacitor is fully charged is estimated only roughly by the charging time, and it is not possible to determine whether the filter capacitor is fully charged by real-time and actual detection. Then the relay switch S1 is turned on at this time after a simple conclusion that the capacitor is full. However, since the capacitor may have a larger voltage drop with temperature increase during charging, the time for the capacitor to be fully charged is long, and it is estimated that the capacitor is fully charged according to the time, but the capacitor is not fully charged due to the influence of the resistor R1. Then at the peak of the power grid, if the relay switch S1 is switched on, there may be a surge current condition because the capacitor is not fully charged at this time. Therefore, it is necessary to accurately determine whether the filter capacitor is fully charged, and when the filter capacitor is fully charged, the peak voltage of the input power grid cannot make the rectifier bridge diode conduct in the forward direction any more, and no charging current exists.
Implementing one step:
fig. 2 shows a schematic diagram of an inrush current suppression circuit provided in an embodiment of the present application, where the inrush current suppression circuit provided in this embodiment is mainly applied to a full dc converter circuit of a dc converter to achieve inrush current suppression in the circuit. Referring to fig. 2, the inrush current suppression circuit specifically includes: the device comprises an alternating current power supply AC, a relay switch S1, a protective resistor R1 connected with the relay switch in parallel, a rectifier bridge, a filter capacitor C, an alternating current voltage detection module, a capacitor voltage detection module and a controller MCU; a first end of an alternating current power supply AC is connected with a first end of an output loop of a relay switch S1, a second end of the output loop of the relay switch S1 is connected with a first alternating current end of a rectifier bridge, and an input loop of the relay switch S1 is connected with a control output end of a controller MCU; two ends of the filter capacitor C are respectively connected with a first direct current end and a second direct current end of the rectifier bridge, and a second end of the alternating current power supply is connected with a second alternating current end of the rectifier bridge; the controller MCU is in signal connection with the alternating voltage detection module and the capacitor voltage detection module, the alternating voltage detection module is used for collecting input voltage information of an alternating current power supply AC in real time, and the capacitor voltage detection module is used for collecting voltage information of a filter capacitor C in real time. The controller MCU is used for driving and controlling the on-off of the relay switch S1 through the driving circuit according to input voltage information of the alternating current power supply AC, voltage information of the filter capacitor C, pre-stored voltage drop information of the protective resistor R1 and voltage drop information of the rectifier bridge which are received in real time so as to restrain surge current when the input voltage is at a peak value. In the initial state of the circuit, the relay switch is disconnected, and the protective resistor R1 is connected into the loop. When the input voltage of the alternating current power supply AC is positive half cycle, the rectifier bridge diodes D1 and D3 are conducted, the rectifier bridge diodes D2 and D4 are cut off, and the alternating current power supply AC, the protective resistor R1, the rectifier bridge diode D1, the filter capacitor C and the rectifier bridge diode D3 form a circuit loop in the circuit; when the input voltage of the alternating current power supply AC is negative half cycle, the rectifier bridge diodes D2 and D4 are conducted, the rectifier bridge diodes D1 and D3 are cut off, and the alternating current power supply AC, the rectifier bridge diodes D2, the filter capacitor C, the rectifier bridge diodes D4 and the protective resistor R1 form a circuit loop in the circuit. The alternating current input voltage is rectified by the rectifier bridge and then charges the filter capacitor C. In the charging process, due to the existence of the protection resistor R1, the charging current of the filter capacitor C is inhibited by the protection resistor R1, and the filter capacitor C is slowly charged. And then, after the filter capacitor C is determined to be full, the relay switch S1 connected with the protective resistor R1 in parallel is switched on at the moment, the protective resistor R1 is bypassed, and the direct-current frequency conversion board enters a normal working state to supply power for a rear-stage load. In order to accurately judge the time when the filter capacitor C is full to ensure that surge current can be inhibited when the input voltage is at the peak value, the embodiment of the application accurately judges whether the filter capacitor C is full through the controller, and the controller switches on the relay switch through the driving circuit after the filter capacitor C is determined to be full, so that the condition of circuit surge when the input voltage is at the peak value is avoided.
Specifically, the alternating current input voltage and the filter capacitor voltage are detected in real time by adding an alternating current voltage detection module and a capacitor voltage detection module, the alternating current input voltage is connected to the L pole and the N pole of an alternating current power supply AC, the attenuation network attenuates the 220V sine wave voltage between the L pole and the N pole to the sine wave voltage within 3.3V in an equal proportion in a resistance voltage division mode, the attenuated voltage signal is input to an AD port of a controller MCU, and the controller MCU tracks the peak value of the alternating current input voltage in real time through the AD port. The voltage detection module detects the voltage at two ends of the filter capacitor C, the attenuated filter capacitor voltage is input into an AD port of the controller MCU through the attenuation network, and the controller MCU tracks the filter capacitor voltage in real time through the AD port. At the moment of electrifying the direct-current frequency conversion board, the controller MCU controls the relay switch S1 to keep a disconnected state, and at the moment, the current charges the post-stage filter capacitor C through the R1. In the charging process, the capacitor voltage detection module detects that the capacitor voltage gradually rises. When the capacitor voltage detection module detects that the capacitor voltage DCbus and the peak value Vp detected by the alternating voltage detection module have the following relation:
DC bus ＝V p -V offset
wherein, DC bus Is the capacitor voltage, V p Is the peak input voltage, V offset For protecting the resistor R1 and the voltage drop V of the rectifier bridge r And V d 。
Then the capacitor is already full. Since the condition of the capacitor charging is V p Need > DC bus And the R1 and the rectifier bridge diode have self voltage drop V in the circuit r And V d ，V r And V d Can be obtained by looking up the voltage drop parameter of the device specification and correcting the actual test, so that only V needs to be satisfied p ＝V r +V d +DC bus It can represent that the rear-stage capacitor is fully charged, and at this time, the peak voltage input into the power grid can no longer make the rectifier bridge diode forward-conduct, and the charging current can no longer be used. At this time, the MCU controls the relay to be conducted without any risk. Therefore, the situation that surge current still exists when the relay is conducted at the peak value of the power grid can be solved.
Above-mentioned, through the input voltage information of real-time collection alternating current power supply and filter capacitor C's voltage information, combine the voltage drop information of the protection resistance that prestores and the voltage drop information of rectifier bridge, when input voltage is in the peak value, judge whether filter capacitor C has been full of to this decides whether relay switch switches on, surge current who produces when with the suppression electric wire netting peak value realizes suppressing the more comprehensive surge current of circuit, avoids surge current to influence circuit safety.
The second embodiment:
the second embodiment of the present application provides a flowchart of a control method of an inrush current suppression circuit, the control method being applied to the inrush current suppression circuit of the first embodiment, and the control method being executed by a controller. Referring to fig. 3, the method for controlling an inrush current suppression circuit provided in this embodiment specifically includes:
s210, collecting input voltage information of the alternating current power supply and voltage information of the filter capacitor in real time.
Illustratively, the alternating voltage detection module and the capacitor voltage detection module respectively detect input voltage information of the alternating current power supply and voltage information of the filter capacitor, and finally, the acquired voltage information is acquired through an AD port of the controller MCU and is compared and judged according to the acquired information.
And S220, when the input voltage of the alternating current power supply is detected to be at the peak value, controlling a relay switch to be conducted to bypass the protection resistor according to prestored voltage drop information of the protection resistor and voltage drop information of the rectifier bridge and if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak value input voltage of the alternating current power supply.
Illustratively, referring to fig. 4, the ac voltage detection module samples at each input voltage peak T1, T2, T3, T4 to obtain a peak V of each input voltage p And the controller MCU judges whether to switch on the relay according to the acquired information. Referring to the first embodiment, it is determined whether the peak value Vp detected by the capacitor voltage DCbus and the ac voltage detection module at this time satisfies V p ＝V r +V d +DC bus Since the condition for charging the capacitor is V p Need > DC bus And the R1 and the rectifier bridge diode have self voltage drop V in the circuit r And V d ，V r And V d Can be obtained by looking up the voltage drop parameter of the device specification and correcting the actual test, so that only V needs to be satisfied p ＝V r +V d +DC bus It can represent that the post-stage capacitor is fully charged, and at this time, the peak voltage of the input power grid can no longer make the rectifier bridge diode conduct in the forward direction, and the charging current can no longer be used. At this time, the MCU controls the relay to be conducted without any risk. Therefore, the situation that surge current still exists when the relay is conducted at the peak value of the power grid can be solved.
And S230, according to the input voltage information of the alternating current power supply collected in real time, if the input voltage is judged to be disconnected, controlling to close the rear-stage load and disconnecting the relay switch.
For example, when the ac power supply is powered on again after being turned off, since the filter capacitor end discharges part of or even all of the electricity, the relay is not turned off, which may cause the next power-on period, and the protection resistor R1 is bypassed by the relay, thereby generating a large surge current again. Therefore, after the ac power supply is confirmed to be off, the relay needs to be turned off so that the protection resistor R1 is not bypassed at the next power-on time, and the surge current can be suppressed. The controller MCU may determine whether the input voltage has been disconnected by detecting the peak value of the input voltage for 2 consecutive cycles when the AC power source AC is disconnected. When the controller MCU continuously detects that the voltage peak value of 2 periods is 0, namely the input voltage is judged to be disconnected, the rear-stage load is immediately closed at the moment, the electric charge stored in the capacitor is prevented from being consumed, the relay switch S1 is disconnected, and the condition that the power grid is immediately recovered after 2 periods is prevented. Because relay switch S1 has already been disconnected at this moment, filter capacitor still stores some charges inside, if the electric wire netting when 3 rd cycle resumes, surge current can effectively be suppressed. Referring to fig. 5, in a time period T1, a power failure of a power grid is input for 2 periods, a controller MCU continuously detects that there is no voltage peak for 2 periods, determines that the power grid has failed, immediately controls to turn off a relay, and when the power grid recovers after the 2 nd period, a surge current is suppressed by a protection resistor R1.
Above-mentioned, through the input voltage information of real-time collection alternating current power supply and filter capacitor's voltage information, combine the voltage drop information of the protection resistance that prestores and the voltage drop information of rectifier bridge, when input voltage is in the peak value, judge whether filter capacitor has been full of to this decides whether relay switch switches on, surge current who produces when with the suppression electric wire netting peak value realizes suppressing the more comprehensive surge current of circuit, avoids surge current to influence circuit safety.
EXAMPLE III
On the basis of the foregoing embodiment, fig. 6 is a schematic structural diagram of a control device of an inrush current suppression circuit according to a third embodiment of the present application. Referring to fig. 6, the control device of the inrush current suppression circuit provided in this embodiment specifically includes: an acquisition module 210 and a conduction module 220.
The collecting module 210 is configured to collect input voltage information of the ac power supply and voltage information of the filter capacitor in real time; the conduction module 220 is configured to, when it is detected that the input voltage of the ac power supply is at a peak value, control the relay switch to be turned on to bypass the protection resistor according to prestored voltage drop information of the protection resistor and prestored voltage drop information of the rectifier bridge, and if a sum of a voltage value of the filter capacitor, a voltage drop of the protection resistor and a voltage drop of the rectifier bridge is equal to the peak input voltage of the ac power supply.
Above-mentioned, through the input voltage information of real-time collection alternating current power supply and filter capacitor's voltage information, combine the voltage drop information of the protective resistance who prestores and the voltage drop information of rectifier bridge, when input voltage is in the peak value, judge whether filter capacitor has been full of to this decides whether relay switch switches on, surge current who produces when with the suppression electric wire netting peak value realizes suppressing the surge current more comprehensive to the circuit, avoids surge current to influence circuit safety.
Specifically, the system further includes a circuit breaking module 230, configured to control to turn off the rear stage load and turn off the relay switch if it is determined that the input voltage is disconnected according to the input voltage information of the ac power source collected in real time.
Specifically, the connection module 220 includes a determining unit, configured to determine that the input voltage is disconnected when the controller continuously detects that the peak input voltage of two periods is 0.
Specifically, the conducting module 220 further includes a pre-storing unit, configured to obtain pre-stored voltage drop information of the protection resistor and voltage drop information of the rectifier bridge according to the voltage drop parameter information of the corresponding device and by matching with an actual test and correcting.
The control device of the inrush current suppression circuit provided by the third embodiment of the present application can be used for executing the control method of the inrush current suppression circuit provided by the second embodiment, and has corresponding functions and beneficial effects.
Example four:
the fourth embodiment of the present application provides an electronic device, which includes an inrush current suppression circuit, where the inrush current suppression circuit is configured to suppress a power-on inrush current of a dc converter board, and the inrush current suppression circuit is the inrush current suppression circuit provided in the first embodiment of the present application. The electronic equipment can be an electronic equipment using full direct current frequency conversion technology, such as a refrigerator, an air conditioner, a microwave oven and the like, and can well suppress surge current during electrification and power grid peak values through a surge suppression circuit of a direct current frequency conversion plate.
The electronic device provided above is further configured to execute the control method of the inrush current suppression circuit provided in the second embodiment, and has corresponding functions and beneficial effects.
Example five:
embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for controlling an inrush current suppression circuit, where the method for controlling the inrush current suppression circuit includes: acquiring input voltage information of an alternating current power supply and voltage information of a filter capacitor in real time;
and when the input voltage of the alternating current power supply is detected to be at the peak value, controlling the relay switch to be conducted to bypass the protection resistor according to the prestored voltage drop information of the protection resistor and the prestored voltage drop information of the rectifier bridge if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak value input voltage of the alternating current power supply.
Storage medium-any of various types of memory devices or storage devices. The term "storage medium" is intended to include: mounting media such as CD-ROM, floppy disk, or tape devices; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, lanbas (Rambus) RAM, etc.; non-volatile memory such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. The storage medium may also include other types of memory or combinations thereof. In addition, the storage medium may be located in a first computer system in which the program is executed, or may be located in a different second computer system connected to the first computer system through a network (such as the internet). The second computer system may provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media that may reside in different locations, such as in different computer systems that are connected via a network. The storage medium may store program instructions (e.g., embodied as a computer program) that are executable by one or more processors.
Of course, the storage medium containing the computer-executable instructions provided in the embodiments of the present application is not limited to the control method of the inrush current suppression circuit described above, and may also perform related operations in the control method of the inrush current suppression circuit provided in any embodiments of the present application.
The control device, the storage medium, and the electronic device of the inrush current suppression circuit provided in the foregoing embodiments may execute the control method of the inrush current suppression circuit provided in any of the embodiments of the present application, and refer to the control method of the inrush current suppression circuit provided in any of the embodiments of the present application without detailed technical details described in the foregoing embodiments.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. The present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the claims.
Claims (9)
1. A control method of an inrush current suppression circuit is applied to the inrush current suppression circuit, and the inrush current suppression circuit comprises the following steps: the relay protection circuit comprises an alternating current power supply, a relay switch, a protection resistor, a rectifier bridge, a filter capacitor, an alternating current voltage detection module, a capacitor voltage detection module and a controller, wherein the protection resistor, the rectifier bridge, the filter capacitor, the alternating current voltage detection module, the capacitor voltage detection module and the controller are connected with the relay switch in parallel;
the first end of the alternating current power supply is connected with the first end of the output loop of the relay switch, the second end of the output loop of the relay switch is connected with the first alternating current end of the rectifier bridge, and the input loop of the relay switch is connected with the control output end of the controller; two ends of the filter capacitor are respectively connected with a first direct current end and a second direct current end of the rectifier bridge, and a second end of the alternating current power supply is connected with a second alternating current end of the rectifier bridge; the controller is in signal connection with the alternating voltage detection module and the capacitor voltage detection module, the alternating voltage detection module is used for collecting input voltage information of the alternating current power supply in real time, and the capacitor voltage detection module is used for collecting voltage information of the filter capacitor in real time;
the controller is used for controlling the on-off of the relay switch according to the input voltage information of the alternating current power supply, the voltage information of the filter capacitor, the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge, which are received in real time, so as to inhibit the surge current when the input voltage is at the peak value;
wherein the controller is configured to implement the control method, and the control method includes:
acquiring input voltage information of an alternating current power supply and voltage information of a filter capacitor in real time;
when the input voltage of the alternating current power supply is detected to be at a peak value, according to prestored voltage drop information of a protection resistor and voltage drop information of a rectifier bridge, if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak value input voltage of the alternating current power supply, a relay switch is controlled to be conducted to bypass the protection resistor.
2. The method of controlling an inrush current suppression circuit according to claim 1, further comprising, after the controlling the relay switch to conduct to bypass the protection resistor:
and according to the input voltage information of the alternating current power supply collected in real time, if the input voltage is judged to be disconnected, controlling to close the rear-stage load and disconnecting the relay switch.
3. The method of claim 2, wherein the determining that the input voltage is off is based on the controller determining that the input voltage is off by continuously detecting that the peak input voltage for two cycles is 0.
4. The method according to claim 1, wherein the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge are obtained by correcting voltage drop parameter information of the corresponding device in cooperation with an actual test.
5. A control device of an inrush current suppression circuit is applied to the inrush current suppression circuit, and the inrush current suppression circuit comprises: the device comprises an alternating current power supply, a relay switch, a protective resistor connected with the relay switch in parallel, a rectifier bridge, a filter capacitor, an alternating current voltage detection module, a capacitor voltage detection module and a controller;
the first end of the alternating current power supply is connected with the first end of the output loop of the relay switch, the second end of the output loop of the relay switch is connected with the first alternating current end of the rectifier bridge, and the input loop of the relay switch is connected with the control output end of the controller; two ends of the filter capacitor are respectively connected with a first direct current end and a second direct current end of the rectifier bridge, and a second end of the alternating current power supply is connected with a second alternating current end of the rectifier bridge; the controller is in signal connection with the alternating current voltage detection module and the capacitor voltage detection module, the alternating current voltage detection module is used for collecting input voltage information of the alternating current power supply in real time, and the capacitor voltage detection module is used for collecting voltage information of the filter capacitor in real time;
the controller is used for controlling the on-off of the relay switch according to the input voltage information of the alternating current power supply, the voltage information of the filter capacitor, the pre-stored voltage drop information of the protection resistor and the voltage drop information of the rectifier bridge, which are received in real time, so as to inhibit the surge current when the input voltage is at the peak value;
characterized in that the control device of the surge current suppression circuit comprises:
the acquisition module is used for acquiring input voltage information of the alternating current power supply and voltage information of the filter capacitor in real time;
and the conduction module is used for controlling the relay switch to be conducted to bypass the protection resistor if the sum of the voltage value of the filter capacitor, the voltage drop of the protection resistor and the voltage drop of the rectifier bridge is equal to the peak input voltage of the alternating current power supply according to prestored voltage drop information of the protection resistor and voltage drop information of the rectifier bridge when the input voltage of the alternating current power supply is detected to be at the peak value.
6. The control device of an inrush current suppression circuit according to claim 5, further comprising:
and the circuit breaking module is used for controlling to close the rear-stage load and disconnect the relay switch if judging that the input voltage is disconnected according to the input voltage information of the alternating-current power supply collected in real time.
7. The apparatus of claim 5, wherein the conducting module comprises:
and the judging unit is used for judging that the input voltage is disconnected when the controller continuously detects that the peak value input voltage of two periods is 0.
8. The apparatus of claim 5, wherein the conducting module further comprises:
and the pre-storage unit is used for matching actual test and correction according to the voltage drop parameter information of the corresponding device to obtain the pre-stored voltage drop information of the protection resistor and the pre-stored voltage drop information of the rectifier bridge.
9. An electronic device, characterized by comprising an inrush current suppression circuit for suppressing an electrifying inrush current of a direct current frequency conversion board, the electronic device being configured to execute the control method of the inrush current suppression circuit according to any one of claims 1 to 4.
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| CN100426614C (en) * | 2004-07-29 | 2008-10-15 | 中兴通讯股份有限公司 | High voltage protective device for input of AC electrical source |
| CN201439976U (en) * | 2009-05-25 | 2010-04-21 | 广东志高空调有限公司 | Suppressing circuit of surge current of inverter air conditioner |
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