CN117767724A - Soft start control device and soft start control method based on thyristor - Google Patents
Soft start control device and soft start control method based on thyristor Download PDFInfo
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- CN117767724A CN117767724A CN202311800057.5A CN202311800057A CN117767724A CN 117767724 A CN117767724 A CN 117767724A CN 202311800057 A CN202311800057 A CN 202311800057A CN 117767724 A CN117767724 A CN 117767724A
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Abstract
The invention belongs to the technical field of power electronics, and discloses a soft start control device and a soft start control method based on thyristors, wherein the soft start control device comprises a first thyristor Q1, a second thyristor Q2, a main relay KIB and a thyristor trigger control device; the first thyristor Q1 and the second thyristor Q2 are reversely connected in parallel to form a controllable circuit; the main relay KIB is connected with the controllable circuit in parallel; one end of the controllable circuit is used for connecting with the voltage of the power grid, and the other end of the controllable circuit is connected with the device to be soft started; the thyristor triggering control device is used for outputting a first control signal to enable the first thyristor Q1 and the second thyristor Q2 to be conducted before the device to be soft started enters the working mode; and outputting a second control signal to turn off the first thyristor Q1 and the second thyristor Q2 after the device to be soft started enters the working mode. The hidden danger of burn-in of the soft start pre-charging mode of the resistor can be effectively eliminated, the product stability is improved, the cost is greatly saved, and the size of the board card is reduced.
Description
Technical Field
The invention belongs to the technical field of power electronics, and relates to a soft start control device and a soft start control method based on thyristors.
Background
In order to reduce the damage caused by voltage fluctuation and impact current in the APF (Active Power Filter )/SVG (Static Var Generator, static var generator) starting process, a current limiting starting resistor is generally connected in series to an ac side inductor, so that the charging transient current is limited within a bearable range of equipment components, the equipment is prevented from being damaged, a main relay KIB is closed after the capacitor on the dc side is precharged, the current limiting resistor is short-circuited by the main relay KIB, and then the chopper boosting stage is entered.
Meanwhile, in order to avoid the phenomenon that the starting resistor of the resistor branch is overloaded to cause heating and firing so as to burn due to the fact that the voltage of a power grid is too high and the main relay KIB fails, a small relay is connected in series with the resistor branch, the small relay is cut when the main relay KIB sucks the power after the precharge is finished, and therefore current does not flow through the resistor branch even if the main relay KIB fails, and the starting resistor is ensured not to generate a firing phenomenon.
However, adding a small relay increases cost and also increases board size. And there are two kinds of situation risks equally, first, do not get rid of and can appear small relay and open main relay KIB and do not close the condition, still can take place to fire like this, and second, the machine is after the operation if the needs of breaking down again the generating line charges this moment if small relay inefficacy does not close and is equivalent to the busbar capacitance charging of breaking circuit. Moreover, the small relay connected in series with the resistor branch circuit cannot solve the problem that the charging resistor overload machine fires when the power is turned on due to the fact that the power grid voltage is too high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a soft start control device and a soft start control method based on thyristors.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention provides a soft start control device based on a thyristor, which comprises a first thyristor Q1, a second thyristor Q2, a main relay KIB and a thyristor trigger control device;
the first thyristor Q1 and the second thyristor Q2 are reversely connected in parallel to form a controllable circuit;
the main relay KIB is connected with the controllable circuit in parallel;
one end of the controllable circuit is used for connecting with the voltage of the power grid, and the other end of the controllable circuit is connected with the device to be soft started;
the thyristor triggering control device is used for outputting a first control signal to the first thyristor Q1 and the second thyristor Q2 before the device to be soft started enters the working mode, wherein the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted; and outputting a second control signal to the first thyristor Q1 and the second thyristor Q2 after the device to be soft started enters the working mode, wherein the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off by combining with the zero crossing of the power grid voltage.
Optionally, the first thyristor Q1 and the second thyristor Q2 are unidirectional thyristors.
Optionally, the first thyristor Q1 and the second thyristor Q2 are packaged by TO-220A.
Optionally, the controllable circuit is used for setting a fuse F1 on one end connected with the power grid voltage.
Optionally, the controllable circuit is configured to connect a first inductor L1 and a first capacitor C1 at one end of the grid voltage;
one end of the first capacitor C1 is connected with a connecting wire between the controllable circuit and the first inductor L1, and the other end of the first capacitor C1 is connected with a low potential end POW-N; the controllable circuit is used for connecting one end of the device to be soft started and is provided with a second inductor L2.
Optionally, the thyristor trigger control device comprises a control chip and a thyristor trigger circuit;
the output end of the control chip is connected with the input end of the thyristor trigger circuit, the first output end of the thyristor trigger circuit is connected with the first thyristor Q1, and the second output end of the thyristor trigger circuit is connected with the second thyristor Q2;
the control chip is used for outputting a high level to the input end of the thyristor trigger circuit before the device to be soft started enters the working mode, the first output end of the thyristor trigger circuit outputs a trigger signal to the first thyristor Q1, the first thyristor Q1 is turned on in response to the trigger signal, the second output end of the thyristor trigger circuit outputs a trigger signal to the second thyristor Q2, and the second thyristor Q2 is turned on in response to the trigger signal; and when the device to be soft started enters the working mode, a low level is output to the input end of the thyristor trigger circuit, no trigger signal is output from the first output end and the second output end of the thyristor trigger circuit, after the power grid voltage crosses zero, the anode voltages of the first thyristor Q1 and the second thyristor Q2 are changed from the forward direction to the reverse direction, and the first thyristor Q1 and the second thyristor Q2 are turned off.
Optionally, the control chip is a DSP chip.
Optionally, the thyristor trigger circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a switching tube KG, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a second capacitor C2, and a transformer L3;
one end of the fourth resistor R4 is connected with the output end of the control chip, and the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5 and the base electrode of the switching tube KG; the other end of the fifth resistor R5 and the emitter of the switching tube KG are grounded;
the collector of the switch tube KG is connected with the cathode of the fifth diode D5 and one end of the primary side of the transformer L3, the anode of the fifth diode D5 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is sequentially connected with the second capacitor C2, the first resistor R1 and the other end of the primary side of the transformer L3; the cathode of the second diode D2 is connected with a connecting line between the first resistor R1 and the transformer L3;
one end of a first secondary side of the transformer L3 is sequentially connected with an anode of the first diode D1, a cathode of the first diode D1, the second resistor R2 and a control end G1 of the second thyristor Q2; the other end of the first secondary side of the transformer L3 is connected with the cathode of the second thyristor Q2 and the anode of the third diode D3; the cathode of the third diode D3 is connected with a connecting wire between the first diode D1 and the second resistor R2;
one end of the second secondary side of the transformer L3 is sequentially connected with an anode of the third diode D3, a cathode of the third diode D3, a third resistor R3 and a control end G2 of the first thyristor Q1; the other end of the first secondary side of the transformer L3 is connected with the cathode of the first thyristor Q1 and the anode of the sixth diode D6; the cathode of the sixth diode D6 is connected to a connection line between the third diode D3 and the third resistor R3.
The second aspect of the present invention provides a soft start control method based on a thyristor of the soft start control device based on a thyristor, comprising:
connecting a controllable circuit with a power grid voltage and a device to be soft-started;
before the soft start device enters the working mode, the main relay KIB is kept off, and a first control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted;
when the soft start device enters a working mode, the main relay KIB is attracted, and a second control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off in combination with zero crossing of the power grid voltage.
Compared with the prior art, the invention has the following beneficial effects:
according to the soft start control device based on the thyristors, the first thyristors Q1 and the second thyristors Q2 are connected in reverse parallel to form a controllable circuit, so that soft start charging control of the device to be soft started is realized under the cooperation of the thyristor trigger control device and the main relay KIB. Before the device to be soft started enters the working mode, two anti-parallel thyristors are conducted so that the branch can flow current in two directions, and finally positive and negative bus capacitors of the device to be soft started are charged, after the device to be soft started enters the working mode, the main relay KIB is attracted, current flows through the branch of the main relay KIB, at the moment, the first thyristor Q1 and the second thyristor Q2 are turned off, and even if the main relay KIB fails, no current flows through the branch of the controllable circuit, so that the safety of the circuit is ensured. If the soft start pre-charge of the resistor is uncontrollable, once the main relay KIB fails, current flows through the resistor branch, so that the resistor is overloaded, heated and fired, and the controllable circuit can realize effective control, thereby avoiding hidden danger of burning and increasing the stability of products. Meanwhile, the thyristor has low cost and small volume, thus greatly saving the cost of the soft start control device and reducing the volume of the board card of the soft start control device.
Drawings
Fig. 1 is a schematic diagram of connection relationship of a controllable circuit and a main relay KIB in use according to an embodiment of the invention.
Fig. 2 is a topology diagram of a thyristor trigger circuit according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, in an embodiment of the present invention, a soft start control device based on a thyristor is provided, which includes a first thyristor Q1, a second thyristor Q2, a main relay KIB, and a thyristor trigger control device.
The first thyristor Q1 and the second thyristor Q2 are reversely connected in parallel to form a controllable circuit; the main relay KIB is connected with the controllable circuit in parallel; one end of the controllable circuit is used for connecting with the voltage of the power grid, and the other end of the controllable circuit is connected with the device to be soft started; the thyristor triggering control device is used for outputting a first control signal to the first thyristor Q1 and the second thyristor Q2 before the device to be soft started enters the working mode, wherein the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted; and outputting a second control signal to the first thyristor Q1 and the second thyristor Q2 after the device to be soft started enters the working mode, wherein the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off by combining with the zero crossing of the power grid voltage.
According to the soft start control device based on the thyristors, the first thyristors Q1 and the second thyristors Q2 are connected in reverse parallel to form a controllable circuit, so that soft start charging control of the device to be soft started is realized under the cooperation of the thyristor trigger control device and the main relay KIB. Before the device to be soft started enters the working mode, two anti-parallel thyristors are conducted so that the branch can flow current in two directions, and finally positive and negative bus capacitors of the device to be soft started are charged, after the device to be soft started enters the working mode, the main relay KIB is attracted, current flows through the branch of the main relay KIB, at the moment, the first thyristor Q1 and the second thyristor Q2 are turned off, and even if the main relay KIB fails, no current flows through the branch of the controllable circuit, so that the safety of the circuit is ensured. If the soft start pre-charge of the resistor is uncontrollable, once the main relay KIB fails, current flows through the resistor branch, so that the resistor is overloaded, heated and fired, and the controllable circuit can realize effective control, thereby avoiding hidden danger of burning and increasing the stability of products. Meanwhile, the thyristor has low cost and small volume, thus greatly saving the cost of the soft start control device and reducing the volume of the board card of the soft start control device.
In one possible implementation, the first thyristor Q1 and the second thyristor Q2 are unidirectional thyristors. Optionally, the first thyristor Q1 and the second thyristor Q2 are packaged by TO-220A.
Specifically, the single size of the unidirectional thyristor adopting the TO-220A packaging mode is only 1.6cm which is 0.9cm, and the price is only about 2.5 yuan, so that the cost is greatly saved, and the size of the board card is reduced.
In one possible embodiment, the controllable circuit is configured to be connected to one end of the mains voltage with a fuse F1.
In a possible embodiment, the controllable circuit is configured to connect the first inductance L1 and the first capacitance C1 to one end of the grid voltage; one end of the first capacitor C1 is connected with a connecting wire between the controllable circuit and the first inductor L1, and the other end of the first capacitor C1 is connected with a low potential end POW-N; the controllable circuit is used for connecting one end of the device to be soft started and is provided with a second inductor L2.
In one possible implementation, the thyristor trigger control device comprises a control chip and a thyristor trigger circuit; the output end of the control chip is connected with the input end of the thyristor trigger circuit, the first output end of the thyristor trigger circuit is connected with the first thyristor Q1, and the second output end of the thyristor trigger circuit is connected with the second thyristor Q2; the control chip is used for outputting a high level to the input end of the thyristor trigger circuit before the device to be soft started enters the working mode, the first output end of the thyristor trigger circuit outputs a trigger signal to the first thyristor Q1, the first thyristor Q1 is turned on in response to the trigger signal, the second output end of the thyristor trigger circuit outputs a trigger signal to the second thyristor Q2, and the second thyristor Q2 is turned on in response to the trigger signal; and when the device to be soft started enters the working mode, outputting a low level to the input end of the thyristor trigger circuit, wherein the first output end and the second output end of the thyristor trigger circuit have no trigger signal output, and the first thyristor Q1 and the second thyristor Q2 are turned off.
Optionally, the control chip is a DSP chip.
Referring to fig. 2, optionally, the thyristor trigger circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a switching tube KG, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a second capacitor C2, and a transformer L3; one end of the fourth resistor R4 is connected with the output end of the control chip, and the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5 and the base electrode of the switching tube KG; the other end of the fifth resistor R5 and the emitter of the switching tube KG are grounded; the collector of the switch tube KG is connected with the cathode of the fifth diode D5 and one end of the primary side of the transformer L3, the anode of the fifth diode D5 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is sequentially connected with the second capacitor C2, the first resistor R1 and the other end of the primary side of the transformer L3; the cathode of the second diode D2 is connected with a connecting line between the first resistor R1 and the transformer L3; one end of a first secondary side of the transformer L3 is sequentially connected with an anode of the first diode D1, a cathode of the first diode D1, the second resistor R2 and a control end G1 of the second thyristor Q2; the other end of the first secondary side of the transformer L3 is connected with the cathode of the second thyristor Q2 and the anode of the third diode D3; the cathode of the third diode D3 is connected with a connecting wire between the first diode D1 and the second resistor R2; one end of the second secondary side of the transformer L3 is sequentially connected with an anode of the third diode D3, a cathode of the third diode D3, a third resistor R3 and a control end G2 of the first thyristor Q1; the other end of the first secondary side of the transformer L3 is connected with the cathode of the first thyristor Q1 and the anode of the sixth diode D6; the cathode of the sixth diode D6 is connected to a connection line between the third diode D3 and the third resistor R3.
Specifically, before the soft start device enters the working mode, the external 3.3V supplies power to the DSP chip, after the DSP chip is powered on, the 172 pins (GPIO 90) output high-level signals by default, then the two secondary sides of the switching tube KG on transformer L3 provide two paths of trigger signals for the first thyristor Q1 and the second thyristor Q2, the two anti-parallel first thyristors Q1 and the second thyristors Q2 are conducted, so that the branch can bidirectionally flow current, and finally the positive bus capacitor and the negative bus capacitor of the soft start device are charged.
After the soft start device enters the working mode, the main relay KIB is attracted, current flows through the branch of the main relay KIB, meanwhile, a software program controls the pins (GPIO 90) of the DSP chip 172 to output low level, the switching tube KG is not conducted, the transformer L3 does not work, a trigger signal cannot be provided for the first thyristor Q1 and the second thyristor Q2, meanwhile, the positive voltages of the first thyristor Q1 and the second thyristor Q2 are changed from forward to reverse by combining with the zero crossing of the power grid voltage, so that the first thyristor Q1 and the second thyristor Q2 are turned off, and when the positive voltages of the first thyristor Q1 and the second thyristor Q2 are changed from reverse to forward again, the first thyristor Q1 and the second thyristor Q2 are not conducted, because no trigger signal is provided, and therefore, current does not flow through the controllable branch even if the main relay KIB breaks down, and the safety of the circuit is ensured.
In still another embodiment of the present invention, a soft start control method based on a thyristor of the above soft start control device based on a thyristor is provided, which can be used to implement controllable soft start of devices requiring soft start precharge, such as an active power filter or a static var generator.
Specifically, the soft start control method based on the thyristor comprises the following steps: connecting a controllable circuit with a power grid voltage and a device to be soft-started; before the soft start device enters the working mode, the main relay KIB is kept off, and a first control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted; when the soft start device enters a working mode, the main relay KIB is attracted, and a second control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off in combination with zero crossing of the power grid voltage.
Compared with a resistance soft start pre-charging mode, the soft start control method based on the thyristor has the advantages that the thyristor is controllable and the resistance is uncontrollable, if the main relay KIB fails in the resistance soft start pre-charging mode, current flows through a resistance branch, so that the resistor is overloaded and heated to cause ignition, and the thyristor is a controllable device, so that the hidden danger of burning can be effectively avoided, and the product stability is improved.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The soft start control device based on the thyristor is characterized by comprising a first thyristor Q1, a second thyristor Q2, a main relay KIB and a thyristor trigger control device;
the first thyristor Q1 and the second thyristor Q2 are reversely connected in parallel to form a controllable circuit;
the main relay KIB is connected with the controllable circuit in parallel;
one end of the controllable circuit is used for connecting with the voltage of the power grid, and the other end of the controllable circuit is connected with the device to be soft started;
the thyristor triggering control device is used for outputting a first control signal to the first thyristor Q1 and the second thyristor Q2 before the device to be soft started enters the working mode, wherein the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted; and outputting a second control signal to the first thyristor Q1 and the second thyristor Q2 after the device to be soft started enters the working mode, wherein the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off by combining with the zero crossing of the power grid voltage.
2. The thyristor-based soft start control device according to claim 1, wherein the first thyristor Q1 and the second thyristor Q2 are unidirectional thyristors.
3. The soft start control device based on the thyristor as claimed in claim 2, wherein the first thyristor Q1 and the second thyristor Q2 are packaged by TO-220A.
4. The thyristor-based soft start control device according to claim 1, wherein the controllable circuit is configured to be connected to a power grid voltage at one end thereof with a fuse F1.
5. The thyristor-based soft start control device according to claim 1, wherein the controllable circuit is configured to connect a first inductor L1 and a first capacitor C1 at one end of a grid voltage;
one end of the first capacitor C1 is connected with a connecting wire between the controllable circuit and the first inductor L1, and the other end of the first capacitor C1 is connected with a low potential end POW-N; the controllable circuit is used for connecting one end of the device to be soft started and is provided with a second inductor L2.
6. The thyristor-based soft start control device according to claim 1, wherein the thyristor trigger control device comprises a control chip and a thyristor trigger circuit;
the output end of the control chip is connected with the input end of the thyristor trigger circuit, the first output end of the thyristor trigger circuit is connected with the first thyristor Q1, and the second output end of the thyristor trigger circuit is connected with the second thyristor Q2;
the control chip is used for outputting a high level to the input end of the thyristor trigger circuit before the device to be soft started enters the working mode, the first output end of the thyristor trigger circuit outputs a trigger signal to the first thyristor Q1, the first thyristor Q1 is turned on in response to the trigger signal, the second output end of the thyristor trigger circuit outputs a trigger signal to the second thyristor Q2, and the second thyristor Q2 is turned on in response to the trigger signal; and when the device to be soft started enters the working mode, a low level is output to the input end of the thyristor trigger circuit, no trigger signal is output from the first output end and the second output end of the thyristor trigger circuit, after the power grid voltage crosses zero, the anode voltages of the first thyristor Q1 and the second thyristor Q2 are changed from the forward direction to the reverse direction, and the first thyristor Q1 and the second thyristor Q2 are turned off.
7. The thyristor-based soft start control device according to claim 6, wherein the control chip is a DSP chip.
8. The thyristor-based soft start control device according to claim 6, wherein the thyristor trigger circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a switching tube KG, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a second capacitor C2, and a transformer L3;
one end of the fourth resistor R4 is connected with the output end of the control chip, and the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5 and the base electrode of the switching tube KG; the other end of the fifth resistor R5 and the emitter of the switching tube KG are grounded;
the collector of the switch tube KG is connected with the cathode of the fifth diode D5 and one end of the primary side of the transformer L3, the anode of the fifth diode D5 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is sequentially connected with the second capacitor C2, the first resistor R1 and the other end of the primary side of the transformer L3; the cathode of the second diode D2 is connected with a connecting line between the first resistor R1 and the transformer L3;
one end of a first secondary side of the transformer L3 is sequentially connected with an anode of the first diode D1, a cathode of the first diode D1, the second resistor R2 and a control end G1 of the second thyristor Q2; the other end of the first secondary side of the transformer L3 is connected with the cathode of the second thyristor Q2 and the anode of the third diode D3; the cathode of the third diode D3 is connected with a connecting wire between the first diode D1 and the second resistor R2;
one end of the second secondary side of the transformer L3 is sequentially connected with an anode of the third diode D3, a cathode of the third diode D3, a third resistor R3 and a control end G2 of the first thyristor Q1; the other end of the first secondary side of the transformer L3 is connected with the cathode of the first thyristor Q1 and the anode of the sixth diode D6; the cathode of the sixth diode D6 is connected to a connection line between the third diode D3 and the third resistor R3.
9. A thyristor-based soft start control method based on the thyristor-based soft start control apparatus according to claim 1, comprising:
connecting a controllable circuit with a power grid voltage and a device to be soft-started;
before the soft start device enters the working mode, the main relay KIB is kept off, and a first control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the first control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be conducted;
when the soft start device enters a working mode, the main relay KIB is attracted, and a second control signal is output to the first thyristor Q1 and the second thyristor Q2 through the thyristor trigger control device; the second control signal is used for controlling the first thyristor Q1 and the second thyristor Q2 to be turned off in combination with zero crossing of the power grid voltage.
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| CN202311800057.5A CN117767724A (en) | 2023-12-25 | 2023-12-25 | Soft start control device and soft start control method based on thyristor |
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| CN202311800057.5A CN117767724A (en) | 2023-12-25 | 2023-12-25 | Soft start control device and soft start control method based on thyristor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118659509A (en) * | 2024-08-21 | 2024-09-17 | 西安西驰电气股份有限公司 | A charging current limiting device, method and main control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118659509A (en) * | 2024-08-21 | 2024-09-17 | 西安西驰电气股份有限公司 | A charging current limiting device, method and main control circuit |
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