CN218449853U - Anti-surge circuit of frequency conversion module - Google Patents
Anti-surge circuit of frequency conversion module Download PDFInfo
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- CN218449853U CN218449853U CN202222207517.0U CN202222207517U CN218449853U CN 218449853 U CN218449853 U CN 218449853U CN 202222207517 U CN202222207517 U CN 202222207517U CN 218449853 U CN218449853 U CN 218449853U
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Abstract
The utility model relates to a charge protection circuit technical field specifically provides a frequency conversion module's surge protection circuit, aims at solving under the prerequisite of ensureing the normal work of frequency conversion module, how to realize frequency conversion module's surge current's effective control of preventing. Mesh for this reason, the utility model discloses a be provided with the power resistor module among the anti-surge circuit, when frequency conversion module disconnection communication connection reached the time of predetermineeing, explain that the overheated back level electric capacity that leads to unable for frequency conversion module of PTC thermistor among the frequency conversion module charges. The rear-stage capacitor of the frequency conversion module can be charged through the power resistor module so as to ensure the bus voltage. Through the configuration mode, the utility model discloses can realize when carrying out effective control to frequency conversion module's surge current, also can effectively avoid because PTC thermistor generates heat seriously and leads to the unable circumstances of charging of back level electric capacity, when having realized ensureing frequency conversion module normal work, effective control surge current.
Description
Technical Field
The utility model relates to a charging protection circuit technical field specifically provides a frequency conversion module's anti-surge circuit.
Background
In the inverter module, in order to prevent a large inrush current from being generated by power-on to charge a capacitor in the main circuit, a PTC (Positive Temperature Coefficient) thermistor is generally added to the inverter module of the main circuit. However, because the capacity of the bus capacitor in the frequency conversion module is low, when the power supply is in instantaneous stop and the like, the bus voltage can be quickly pulled down; when the power grid is instantly stopped and recovered, a large surge current can be generated. If the action is repeated under the condition that the power grid is unstable, the PTC thermistor is heated seriously, and the subsequent circuit cannot be electrified and operated normally.
Meanwhile, in the case that the alternating current relay is used as the power relay on the direct current side, because the alternating current relay is not provided with a loop integrating arc extinction, when the relay is disconnected, if the load of the rear stage is not completely stopped or the front-stage reactor is charging the capacitor, and a large current flows in the loop, an arc discharge phenomenon can be generated, and the heat generated by arc discharge for many times causes the electric shock of the relay to melt adhesion, thereby causing the damage of the frequency conversion module.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above defect, the utility model discloses to solve or solve at least partially and guaranteeing under the prerequisite of frequency conversion module normal work, how to realize frequency conversion module's surge current's effective control.
In a first aspect, the utility model provides a frequency conversion module's surge protection circuit, surge protection circuit includes PTC thermistor module, power resistor module and power relay, PTC thermistor module the power resistor module with power relay parallel connection, surge protection circuit's one end with frequency conversion module's major loop inductance is connected, surge protection circuit's the other end with frequency conversion module's back level electric capacity is connected.
In a technical solution of the anti-surge circuit of the frequency conversion module, the power resistor module includes a power resistor and a power resistor control submodule, the power resistor control submodule is connected in series with the power resistor, and the power resistor control submodule is configured to control the power resistor to be connected to or removed from the anti-surge circuit.
In one technical scheme of the surge protection circuit of the frequency conversion module, the PTC thermistor module comprises a PTC thermistor and a thermistor control submodule, the thermistor control submodule is connected in series with the PTC thermistor, and the thermistor control submodule is used for controlling the PTC thermistor to be connected into or removed from the surge protection circuit.
In a technical solution of the anti-surge circuit of the above frequency conversion module, the anti-surge circuit includes a detection resistor, a first end of the detection resistor is connected to the power relay, and a second end of the detection resistor is connected to the rear-stage capacitor.
In one technical solution of the anti-surge circuit of the frequency conversion module, the anti-surge circuit includes a voltage detection module, and the voltage detection module is connected in parallel with the detection resistor.
In one technical solution of the anti-surge circuit of the frequency conversion module, the voltage detection module includes a linear isolation photoelectric coupler and an operational amplifier circuit, a first end of the detection resistor is connected to an input end of the linear isolation photoelectric coupler, a second end of the detection resistor is connected to a turn-off signal end of the linear isolation photoelectric coupler, a positive output end of the linear isolation photoelectric coupler is connected to a first end of the operational amplifier circuit, and a negative output end of the linear isolation photoelectric coupler is connected to a second end of the operational amplifier circuit.
In one technical solution of the anti-surge circuit of the frequency conversion module, the power resistance control submodule includes a first relay, and the first relay is connected in series with the power resistance.
In one technical solution of the anti-surge circuit of the frequency conversion module, the thermistor control submodule includes a second relay, and the second relay is connected in series with the PTC thermistor.
In one technical solution of the anti-surge circuit of the frequency conversion module, the power resistance control submodule includes a first relay protection circuit, and the first relay protection circuit is connected in parallel with the first relay; and/or the presence of a gas in the gas,
the thermistor control submodule comprises a second relay protection circuit, and the second relay protection circuit is connected with the second relay in parallel.
In one technical solution of the above anti-surge circuit of the frequency conversion module, the anti-surge circuit includes a third relay protection circuit, and the third relay protection circuit is connected in parallel with the power relay.
The utility model discloses above-mentioned one or more technical scheme has following one or more beneficial effect at least:
in implementing the technical scheme of the utility model, the utility model discloses an among the anti-surge circuit be provided with the power resistance module, when frequency conversion module disconnection communication connection reached the time of predetermineeing, explain that the overheated back level electric capacity that leads to unable for frequency conversion module of PTC thermistor among the frequency conversion module charges. The rear-stage capacitor of the frequency conversion module can be charged through the power resistor module so as to ensure the bus voltage. Through the configuration mode, the utility model discloses can realize when carrying out effective control to frequency conversion module's surge current, also can effectively avoid because PTC thermistor generates heat seriously leads to the unable circumstances that charges of back level electric capacity, when having realized ensureing frequency conversion module normal work, effective control surge current.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present disclosure. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
fig. 1 is a schematic diagram of a main component circuit of an anti-surge circuit of a frequency conversion module according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a main component circuit of an anti-surge circuit of a frequency conversion module according to an embodiment of the present invention.
List of reference numbers:
11: a main loop inductance; 12: a back-stage capacitor; 2: an anti-surge circuit; 21: a PTC thermistor module; 211: a PTC thermistor; 212: a thermistor control submodule; 2121: a second relay; 2122: a second relay protection circuit; 22: a power resistance module; 221: a power resistor; 222: a power resistance control submodule; 2221: a first relay; 2222: a first relay protection circuit; 23: a power relay; 24: detecting a resistance; 25: a voltage detection module; 251: a linear isolation photocoupler; 252: an operational amplifier circuit; 26: and a third relay protection circuit.
Detailed Description
Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, unless otherwise explicitly stated or limited in the description of the present invention, the terms "mounted," "connected" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, fig. 1 is a schematic diagram of a main component circuit of an anti-surge circuit of a frequency conversion module according to an embodiment of the present invention. As shown in fig. 1, in the embodiment of the present invention, the anti-surge circuit 2 may include a PTC thermistor module 21, a power resistor module 22 and a power relay 23, the PTC thermistor module 21, the power resistor module 22 and the power relay 23 are connected in parallel, one end of the anti-surge circuit 2 is connected to the main loop inductor 11 of the frequency conversion module, and the other end of the anti-surge circuit 2 is connected to the post capacitor 12 of the frequency conversion module.
In the present embodiment, if the power grid is unstable, the power supply may be repeatedly stopped and restored, which may cause the PTC (Positive Temperature Coefficient) thermistor to overheat and fail to charge the rear-stage capacitor 12 of the inverter module. Therefore, the communication condition between the frequency conversion module and the main control board can be detected at regular time, if the communication disconnection between the frequency conversion module and the main control board reaches the preset time, it indicates that the PTC thermistor is overheated and cannot realize the charging of the rear capacitor 12, and the rear capacitor 12 can be charged through the power resistor module 22, so as to ensure the voltage value of the bus voltage.
In one embodiment, the preset time period may be 15s.
In one embodiment, the power relay 23 may be an ac relay.
In the present embodiment, when the voltage value of the bus voltage reaches the preset first voltage threshold, the power relay 23 may be controlled to pull in, and the PTC thermistor module 21 and the power resistor module 22 may be controlled to be removed from the anti-surge circuit 2.
In one embodiment, when the bus voltage value continues for a certain time after the preset first voltage value, the bus voltage value may be considered to reach the preset first voltage value.
In one embodiment, when the bus voltage value reaches 80% or more of the set value and lasts for 3 seconds, the bus voltage value may be considered to reach the preset first voltage value.
In one embodiment, when the bus voltage value reaches 70% or more of the set value and lasts for 30 seconds, the bus voltage value may be considered to reach the preset first voltage value.
The utility model discloses a be provided with power resistor module 22 among the anti-surge circuit 2, when frequency conversion module disconnection communication connection reached the time of predetermineeing, explain that the overheated back level electric capacity that leads to unable for frequency conversion module of PTC thermistor among the frequency conversion module charges. The charging of the rear stage capacitor of the frequency conversion module can be realized by the power resistor module 22 to ensure the bus voltage. Through the configuration mode, the utility model discloses can realize when carrying out effective control to frequency conversion module's surge current, also can effectively avoid because PTC thermistor generates heat seriously leads to the unable circumstances that charges of back level electric capacity, when having realized ensureing frequency conversion module normal work, effective control surge current.
In an implementation manner of the embodiment of the present invention, referring to fig. 2, fig. 2 is a schematic circuit diagram of main components of an anti-surge circuit of a frequency conversion module according to an implementation manner of the embodiment of the present invention. As shown in fig. 2, power resistor module 22 may include a power resistor 221 (R5) and a power resistor control sub-module 222, where power resistor control sub-module 222 is used to control power resistor 221 to access or remove anti-surge circuit 2. Wherein, PIM1, L1 and C1 constitute frequency conversion module, RY3 is power relay 23.
In this embodiment, the power resistor 221 may be connected to the anti-surge circuit 2 by the power resistor control sub-module 222.
In one embodiment, with continued reference to fig. 2, as shown in fig. 2, power resistance control submodule 222 may include first relay 2221 (RY 1), first relay 2221 connected in series with power resistance 221. The connection or removal of the power resistor 221 from the surge protection circuit 2 can be realized by controlling the first relay 2221.
In one embodiment, the power resistance control submodule 222 may include a first relay protection circuit 2222, the first relay protection circuit 2222 being connected in parallel with the first relay 2221. The power resistor 221 can be controlled to be connected to or removed from the surge circuit 2 by controlling the opening and closing of the first relay 2221.
In one embodiment, as shown in fig. 2, the first relay protection circuit 2222 may be composed of D1, R3, and Q1 may be KTC9013S.
In one implementation of the embodiment of the present invention, as shown in fig. 2, the PTC thermistor module 21 can include a PTC thermistor 211 (PTC 1) and a thermistor control submodule 212, the thermistor control submodule 212 is connected in series with the PTC thermistor 211, and the thermistor control submodule 212 is used for controlling the PTC thermistor 211 to be connected to or removed from the surge protection circuit 2.
In the present embodiment, the PTC thermistor 211 and the power resistor 221 can be controlled to be removed from the anti-surge circuit 2 by controlling the power resistor control submodule 222 and the thermistor control submodule 212.
In one embodiment, with continued reference to fig. 2, as shown in fig. 2, the thermistor control sub-module 212 includes a second relay 2121 (RY 2), and the second relay 2121 is connected in series with the PTC thermistor 211. The PTC thermistor 211 can be controlled to switch on or switch off the surge circuit 2 by controlling the opening and closing of the second relay 2121.
In one embodiment, the thermistor control submodule 212 includes a second relay protection circuit 2122, and the second relay protection circuit 2122 is connected in parallel with a second relay 2121
In one embodiment, as shown in fig. 1, the second relay protection circuit 2122 may be composed of D2, R4, and Q2 may be KTC9013S.
In one embodiment, as shown in fig. 2, the anti-surge circuit 2 further includes a third relay protection circuit 26, and the third relay protection circuit 26 is connected in parallel with the power relay 23.
In one embodiment, the third relay protection circuit 26 may be composed of D3, R7, R8, and Q3 may be KTC9013S.
In one embodiment of the present invention, as shown in fig. 2, the anti-surge circuit 2 includes a detection resistor 24 (R6), a first end of the detection resistor 24 is connected to the power relay 23, and a second end of the detection resistor 24 is connected to the post-stage capacitor 12.
In the present embodiment, since the main loop inductor 11 can store a certain amount of energy, the voltage value across the detection resistor 24 can be detected, and the power relay 23 can be directly turned off, which may cause arcing. To avoid arcing, it is necessary to ensure that the power relay 23 is opened when no current flows through the power relay 23. Therefore, by obtaining the voltage value across the detection resistor 24 connected in series with the power relay 23, it is possible to determine whether or not a current flows through the power relay 23 based on the voltage value. When the voltage value across the detection resistor 24 is smaller than the preset second voltage threshold, it may be considered that the current on the power relay 23 is close to zero at this time, and the power relay 23 may be controlled to be removed from the anti-surge circuit 2.
In one embodiment, as shown in fig. 2, the anti-surge circuit 2 includes a voltage detection module 25, and the voltage detection module 25 is connected in parallel with the detection resistor 24. The voltage value on the detection resistor 24 can be obtained by the voltage detection module 25.
In one embodiment, the voltage detection module 25 includes a linear isolation photocoupler 251 (PC 1) and an operational amplifier circuit 252, a first end of the detection resistor 24 is connected to an input end (VIN) of the linear isolation photocoupler 251, a second end of the detection resistor 24 is connected to a turn-off signal end (SHDN) of the linear isolation photocoupler 251, a positive output end (VOUT +) of the linear isolation photocoupler 251 is connected to a first end of the operational amplifier circuit 252, and a negative output end (VOUT-) of the linear isolation photocoupler 251 is connected to a second end of the operational amplifier circuit 252.
In one embodiment, as shown in fig. 2, the operational amplifier circuit 252 may include R9, R10, R11, R12, R13, C2, C3, C6, C7, TLC2272aid R (operational amplifiers IC1A and IC 1B), and BAV99LT1 (diode D4), and may obtain the voltage value of the detection resistor 24 through the output terminal of the IC 1B.
Further, it should be understood that, since the configuration of each module is only for explaining the functional units of the device of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. This kind of split or the combination to specific module can not lead to technical scheme skew the utility model discloses a principle, consequently, technical scheme after split or the combination will all fall into the utility model discloses a within the scope of protection.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a frequency conversion module's anti-surge circuit, its characterized in that, anti-surge circuit includes PTC thermistor module, power resistor module and power relay, PTC thermistor module power resistor module with power relay parallel connection, anti-surge circuit's one end with frequency conversion module's main loop inductance is connected, anti-surge circuit's the other end with frequency conversion module's back level electric capacity is connected.
2. The anti-surge circuit of the frequency conversion module according to claim 1, wherein the power resistor module comprises a power resistor and a power resistor control submodule, the power resistor control submodule is connected in series with the power resistor, and the power resistor control submodule is used for controlling the power resistor to be connected into or removed from the anti-surge circuit.
3. The anti-surge circuit of the frequency conversion module according to claim 2, wherein the PTC thermistor module comprises a PTC thermistor and a thermistor control sub-module, the thermistor control sub-module being connected in series with the PTC thermistor, the thermistor control sub-module being configured to control the PTC thermistor to be connected to or removed from the anti-surge circuit.
4. The anti-surge circuit of the frequency conversion module according to claim 1, wherein the anti-surge circuit comprises a detection resistor, a first end of the detection resistor is connected with the power relay, and a second end of the detection resistor is connected with the post-stage capacitor.
5. The anti-surge circuit of the frequency conversion module according to claim 4, wherein the anti-surge circuit comprises a voltage detection module, and the voltage detection module is connected in parallel with the detection resistor.
6. The anti-surge circuit of the frequency conversion module according to claim 5, wherein the voltage detection module comprises a linear isolation photocoupler and an operational amplifier circuit, a first end of the detection resistor is connected to an input end of the linear isolation photocoupler, a second end of the detection resistor is connected to a turn-off signal end of the linear isolation photocoupler, a positive output end of the linear isolation photocoupler is connected to a first end of the operational amplifier circuit, and a negative output end of the linear isolation photocoupler is connected to a second end of the operational amplifier circuit.
7. The anti-surge circuit of the frequency conversion module of claim 3, wherein the power resistance control submodule comprises a first relay connected in series with the power resistance.
8. The surge-protection circuit of a frequency conversion module as claimed in claim 7, wherein the thermistor control sub-module comprises a second relay connected in series with the PTC thermistor.
9. The anti-surge circuit of the frequency conversion module of claim 8, wherein the power resistance control submodule comprises a first relay protection circuit connected in parallel with the first relay; and/or the presence of a gas in the gas,
the thermistor control submodule comprises a second relay protection circuit, and the second relay protection circuit is connected with the second relay in parallel.
10. The anti-surge circuit of the frequency conversion module of claim 8, comprising a third relay protection circuit connected in parallel with the power relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222207517.0U CN218449853U (en) | 2022-08-22 | 2022-08-22 | Anti-surge circuit of frequency conversion module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222207517.0U CN218449853U (en) | 2022-08-22 | 2022-08-22 | Anti-surge circuit of frequency conversion module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218449853U true CN218449853U (en) | 2023-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222207517.0U Active CN218449853U (en) | 2022-08-22 | 2022-08-22 | Anti-surge circuit of frequency conversion module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218449853U (en) |
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- 2022-08-22 CN CN202222207517.0U patent/CN218449853U/en active Active
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