CN111901936B - Silicon controlled rectifier holding current control method and circuit - Google Patents
Silicon controlled rectifier holding current control method and circuit Download PDFInfo
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- CN111901936B CN111901936B CN202010677259.5A CN202010677259A CN111901936B CN 111901936 B CN111901936 B CN 111901936B CN 202010677259 A CN202010677259 A CN 202010677259A CN 111901936 B CN111901936 B CN 111901936B
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Abstract
The invention discloses a method and a circuit for controlling the holding current of a controlled silicon, wherein the method is applied to the controlled silicon holding current control circuit comprising a control module and comprises the following steps: the method comprises the steps of selecting a reference value according to the state of the controllable silicon or a control signal output by the control module, determining a comparison value according to the product of bus parameters and a preset coefficient, and determining a holding current based on the reference value and the comparison value, so that the output variable holding current is reduced along with the increase of bus voltage when the controllable silicon is started, and the adaptability and the efficiency of the controllable silicon are improved.
Description
Technical Field
The application relates to the technical field of LED (light emitting diode) thyristors, in particular to a thyristor holding current control method and a thyristor holding current control circuit.
Background
The thyristor holding current is used for maintaining the thyristor to work stably, the smaller the holding current is, the higher the system efficiency is, however, the too small holding current causes the overlong controllable starting time, and the stability and the reliability of the system are influenced.
In the prior art, in order to improve the adaptability of the thyristor, the thyristor is designed according to the maximum holding current, that is, the thyristor adopts a constant relatively large holding current in one period, and the adoption of the method causes the efficiency of the whole system to be reduced.
How to improve the adaptability of the silicon controlled rectifier, reduce the holding current and improve the stability of the system is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a method for controlling the holding current of a controlled silicon, which is used for expanding the application range of the controlled silicon, improving the efficiency of the controlled silicon and reducing the electric energy loss caused by overhigh holding current. The method is applied to a silicon controlled rectifier maintaining current control circuit comprising a control module, and comprises the following steps:
selecting a reference value according to the state of the controllable silicon or the control signal output by the control module;
determining a comparison value according to the product of a bus parameter and a preset coefficient, wherein the bus parameter is bus voltage or bus current;
determining a sustain current based on the reference value and the comparison value, the sustain current being variable.
Preferably, before the reference value is selected according to the state of the thyristor or the control signal output by the control module, the method further comprises:
inputting the bus parameters into the control module;
if the difference value between the bus parameter and the preset threshold value is larger than a preset difference value, outputting a first control signal based on the control module, and taking the first control signal as the control signal;
and if the difference value is not larger than the preset difference value, outputting a second control signal based on the control module, and taking the second control signal as the control signal.
Preferably, before the reference value is selected according to the state of the thyristor or the control signal output by the control module, the method further comprises:
inputting the bus bar parameters into the control module,
and if the bus voltage is in the drop delay and the difference value is greater than the preset difference value, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
Preferably, before the reference value is selected according to the state of the thyristor or the control signal output by the control module, the method further comprises:
inputting the LED current of the LED load into the control module;
and if the difference is larger than the preset difference and the LED current is not zero, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
Preferably, the reference value includes a first reference value and a second reference value, and the reference value is determined according to a state of the thyristor or the control signal output by the control module, specifically:
if the state is a conducting state or the control signal is a first control signal, taking the first reference value as the reference value;
if the state is the turned-on state, taking the first reference value or the second reference value as the reference value;
if the control signal is a second control signal, taking the second reference value as the reference value;
the first reference value is determined according to the bus parameter, and the second reference value is a preset reference value.
Preferably, the holding current is determined based on the reference value and the comparison value, specifically:
if the reference value is the first reference value, determining a first maintenance current based on the first reference value and the comparison value, and taking the first maintenance current as the maintenance current;
if the reference value is the second reference value, determining a second holding current based on the second reference value and the comparison value, and taking the second holding current as the holding current;
wherein the first sustain current is not less than the second sustain current.
Preferably, the LED current is determined from a terminal voltage of the LED load.
Correspondingly, the application also provides a silicon controlled rectifier holding current control circuit, which comprises a control module, a comparison value output module and a constant current control module, wherein,
the control module is used for outputting a control signal according to the bus parameter or the LED current of the LED load and selecting a reference value according to the control signal;
the comparison value output module is used for outputting a comparison value according to the bus parameter;
the constant current control module is used for comparing the reference value with the comparison value and outputting a maintaining current according to the comparison result;
wherein the number of the reference values is one or more.
Preferably, the control module further comprises a detection module and a switch module, wherein,
the detection module is used for detecting the bus parameter and the LED current and outputting the control signal;
the switch module is used for determining the reference value according to the control signal;
the detection module comprises a first input end, a second input end and an output end, the first input end of the detection module is connected with the bus, the second input end of the detection module is connected with the LED load, and the output end of the detection module is connected with the switch module.
Preferably, the constant current control module further comprises a comparison module, a power tube, a first resistor and a second resistor, wherein,
the first input end of the comparison module is connected with the output end of the switch module, the second input end of the comparison module and the first end of the first resistor are connected with the output end of the comparison value output module in a shared mode, the second end of the first resistor and the source electrode of the power tube are connected with the first end of the second resistor in a shared mode, the output end of the comparison module is connected with the grid electrode of the power tube, the drain electrode of the power tube is connected with the maintaining current, and the second end of the second resistor is grounded.
Preferably, the switch module comprises a single sub-switch module or a plurality of sub-switch modules connected in parallel, and the number of the sub-switch modules is consistent with the number of the reference values
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method and a circuit for controlling the holding current of a controlled silicon, wherein the method selects a reference value according to the state of the controlled silicon or a control signal output by a control module; determining a comparison value according to the product of the bus parameter and a preset coefficient; and determining a holding current based on the reference value and the comparison value, so that the output variable holding current is reduced along with the increase of the bus voltage when the controllable silicon is started, the use range of the controllable silicon is further expanded due to the adjustability of the holding current, the starting time of the controllable silicon is controllable, the stability and the reliability of the controllable silicon are improved, and when the current flows through the LED load or the controllable silicon is conducted, the holding current is adjusted to the minimum value to maintain the conduction of the controllable silicon, so that the efficiency of the controllable silicon is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a thyristor holding current control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a thyristor holding current control circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a thyristor holding current control circuit according to another embodiment of the invention;
fig. 4 is a waveform diagram illustrating the variation of the holding current of the scr holding current control circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As described in the background art, after the thyristor is turned on, the constant high holding current will cause the system efficiency to be reduced due to the overhigh holding current, and the constant holding current is not favorable for further expanding the use range of the thyristor.
In order to solve the above problem, an embodiment of the present application provides a method for controlling a thyristor holding current, which is applied to a thyristor holding current control circuit including a control module, and as shown in fig. 1, the method includes:
and S101, selecting a reference value according to the state of the controllable silicon or the control signal output by the control module.
In this step, the bus parameter may be a bus voltage or a bus current, and in order to expand the application range of the thyristor, that is, to enable the thyristor to be turned on under different conditions, and to enable the turn-on time of the thyristor to be controllable in different application environments, the magnitude of the holding current needs to be adjusted according to the change of the bus voltage or the bus current or the state of the thyristor. Meanwhile, one or more reference values are preset in the embodiment of the present application, and the magnitude of the holding current can be controlled according to different reference values, so in the preferred embodiment of the present application, the reference value is selected according to the state of the thyristor or the control signal output by the control module, the reference value can be a voltage reference value or a current reference value, and the control signal is determined according to the bus parameter or the LED current of the LED load.
In order to enable the control module to output an accurate control signal, in a preferred embodiment of the present application, before selecting the reference value according to the state of the thyristor or the control signal output by the control module, the method further includes:
inputting the bus parameters into the control module;
if the difference value between the bus parameter and the preset threshold value is larger than a preset difference value, outputting a first control signal based on the control module, and taking the first control signal as the control signal;
and if the difference value is not larger than the preset difference value, outputting a second control signal based on the control module, and taking the second control signal as the control signal.
The bus parameter can reflect the conduction state of the silicon controlled rectifier, the control module can output different control signals according to the bus parameter, after the control module obtains the bus parameter, if the difference value between the bus parameter and the preset threshold value is larger than the preset difference value, the silicon controlled rectifier is transited from the off state to the on state, and at the moment, the control module outputs a first control signal; if the difference is not larger than the preset difference, the thyristor is turned on, and at the moment, the control module outputs a second control signal.
It should be noted that the control signal is not limited to the first control signal and the second control signal, and other control signals may also be determined according to other parameters, such as a difference between the bus parameter and the preset threshold, and a corresponding reference value may be selected according to other control signals.
In order to enable the control module to output an accurate control signal, in a preferred embodiment of the present application, before selecting the reference value according to the state of the thyristor or the control signal output by the control module, the method further includes:
inputting the bus bar parameters into the control module,
and if the bus parameter is in descending delay and the difference value is greater than the preset difference value, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
Specifically, if the bus parameter is in the descending delay, it indicates that the LED load is already on, i.e. the thyristor is in the maintenance mode, and therefore, the difference between the bus parameter and the preset threshold is greater than the preset difference, a larger first maintenance current is not needed, and only a smaller second maintenance current is needed to ensure the normal operation of the thyristor and the LED load.
In order to enable the control module to output an accurate control signal, in a preferred embodiment of the present application, before selecting the reference value according to the state of the thyristor or the control signal output by the control module, the method further includes:
inputting the LED current of the LED load into the control module;
and if the difference is larger than the preset difference and the LED current is not zero, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
Specifically, after the control module obtains the LED current of the LED load, once the LED current is detected to be not zero, it indicates that the thyristor is turned on, and even if the difference is greater than the preset difference, the control module also outputs the second control signal.
In order to determine an accurate reference value, in a preferred embodiment of the present application, the reference value includes a first reference value and a second reference value, and the determining the reference value according to a state of the thyristor or a control signal output by the control module specifically includes:
if the state is a conducting state or the control signal is a first control signal, taking the first reference value as the reference value;
if the state is the turned-on state, taking the first reference value or the second reference value as the reference value;
if the control signal is a second control signal, taking the second reference value as the reference value;
the first reference value is determined according to the bus parameter, and the second reference value is a preset reference value.
In this step, the reference values include a first reference value determined according to the bus parameter and a second reference value determined according to a preset reference value, the required holding current of the thyristor is different in different states, and the required holding current is relatively large in the conduction process of the thyristor; when the thyristor is turned on, the required holding current is relatively small.
If the state is a conducting state or the control signal is a first control signal, the required holding current is relatively large, and the first reference value can be used as the reference value; if the state is the turned-on state, the first reference value or the second reference value may be used as the reference value; if the control signal is a second control signal, the required holding current is relatively small, and the second reference value is taken as the reference value.
It should be noted that the reference value is not limited to the first reference value and the second reference value, the scheme of the above preferred embodiment is only a specific implementation scheme proposed in the present application, and other ways of determining the reference value according to the state of the thyristor or the control signal output by the control module all belong to the protection scope of the present application.
And S102, determining a comparison value according to the product of the bus parameter and a preset coefficient, wherein the bus parameter is bus voltage or bus current.
In order to make the holding current meet the requirements of the on and holding states of the controllable silicon, a corresponding comparison value needs to be determined according to the bus parameters.
Step S103, determining a holding current based on the reference value and the comparison value, the holding current being variable.
Specifically, in order to expand the use range of the thyristor and ensure that the turn-on time of the thyristor in a non-use environment is controllable, and the maintaining current value is reduced to the minimum maintaining value after the thyristor is turned on, the maintaining current value needs to be determined according to the reference value and the comparison value selected in the above steps, and the comparison value is determined according to the bus parameter and is variable, so that the maintaining current obtained by the thyristor is also variable.
In order to determine an accurate sustain current, in a preferred embodiment of the present application, the sustain current is determined based on the reference value and the comparison value, specifically:
if the reference value is the first reference value, determining a first maintenance current based on the first reference value and the comparison value, and taking the first maintenance current as the maintenance current;
if the reference value is the second reference value, determining a second holding current based on the second reference value and the comparison value, and taking the second holding current as the holding current;
wherein the first sustain current is greater than the second sustain current.
In this step, different holding currents are determined according to different reference values and corresponding comparison values, and if the reference value is the first reference value, the required holding current is relatively large, and a large first holding current is determined based on the first reference value and the comparison value; if the reference value is the second reference value, and the required sustain current is relatively small at this time, a smaller second sustain current is determined based on the second reference value and the comparison value, and in a preferred embodiment of the present application, the second sustain current may be a minimum allowable sustain current.
It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and other ways of determining the holding current based on the reference value and the comparison value are all within the protection scope of the present application.
In order to accurately detect the LED current, in a preferred embodiment of the present application, the LED current is determined from the terminal voltage of the LED load.
By applying the technical scheme, a reference value is selected according to the state of the controllable silicon or the control signal output by the control module; determining a comparison value according to the product of the bus parameter and a preset coefficient; and determining a holding current based on the reference value and the comparison value, so that the output variable holding current is reduced along with the increase of the bus voltage when the controllable silicon is started, the use range of the controllable silicon is further expanded due to the adjustability of the holding current, the starting time of the controllable silicon is controllable, the stability and the reliability of the controllable silicon are improved, and when the current flows through the LED load or the controllable silicon is conducted, the holding current is adjusted to the minimum value to maintain the conduction of the controllable silicon, so that the efficiency of the controllable silicon is improved.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
The control module is used for a silicon controlled rectifier maintaining current control circuit comprising a control module, a comparison value output module and a constant current control module, wherein the control module is used for outputting a control signal according to bus parameters or LED current of an LED load and selecting a reference value according to the control signal; the comparison value output module is used for outputting a comparison value according to the bus parameter; and the constant current control module is used for comparing the reference value with the comparison value and outputting the holding current according to the comparison result.
As shown in fig. 2, the control module acquires bus parameters according to the state of the thyristor or the state of the bus parameters, compares the acquired bus parameters with a preset threshold, and outputs a control signal to the switch module according to the comparison result; the switch module receives the control signal and is conducted to provide a reference value for the constant current control module; the comparison value output module receives the bus parameter output comparison value, and the constant current control module compares the reference value with the comparison value to output voltage so that the controlled silicon obtains a holding current.
The control module further comprises a detection module for detecting the bus parameter and the LED current and outputting a control signal, and also for comparing the detected bus parameter with a preset threshold value and outputting a control signal. The control module further comprises a switch module used for determining the reference value according to the control signal, the detection module comprises a first input end, a second input end and an output end, the first input end of the detection module is connected with the bus, the second input end of the detection module is connected with the LED load, and the output end of the detection module is connected with the switch module.
The detection module compares the collected bus parameters with a preset threshold value to determine a difference value between the collected bus parameters and the preset threshold value, and when the difference value is larger than the preset difference value, the detection module outputs a first control signal to the switch module to enable the constant-current control module to obtain a first reference value; when the difference value is smaller than the preset difference value, the detection module outputs a second control signal to the switch module, so that the constant current control module obtains a second reference value; when the difference value is larger than the preset difference value and the LED current collected by the detection module is not zero, the detection module outputs a second control signal to the switch module, so that the constant current control module obtains a second reference value.
The switch module further comprises a first sub-switch module and a second sub-switch module, wherein the first sub-switch module is used for receiving the first control signal sent by the detection module and conducting the first control signal so as to enable the constant current control module to obtain a first reference value. The second sub-switch module is used for receiving a second control signal sent by the detection module and conducting the second control signal so that the constant current control module obtains a second reference value.
Specifically, the detection module outputs a first control signal to the first sub-switch module and enables the first sub-switch module to be conducted, the first sub-switch module outputs a first reference value to the constant current control module, the constant current control module calculates a comparison value output by the comparison value output module and the received first reference value, and the controlled silicon obtains a first holding current when outputting voltage. The detection module outputs a second control signal to the second sub-switch module and enables the second sub-switch module to be conducted, the second sub-switch module outputs a second reference value to the constant current control module, the constant current control module calculates the comparison value output by the comparison value output module and the received second reference value, the thyristor obtains a second holding current when outputting voltage, it needs to be stated that the first reference value can be a threshold voltage representing bus parameters, the second reference value can be a threshold voltage corresponding to a minimum holding current, the first holding current is not less than the second holding current, and the second holding current can be the minimum holding current.
Referring to fig. 3, the embodiment exemplarily shows three sub-switch modules connected in parallel, which is used for explaining that the switch module includes a single sub-switch module or a plurality of sub-switch modules connected in parallel.
Specifically, the detection module outputs a first control signal to the first sub-switch module and enables the first sub-switch module to be conducted, the first sub-switch module outputs a first reference value to the constant current control module, the constant current control module calculates the comparison value and the received first reference value, and the controlled silicon obtains a first holding current when outputting voltage; the detection module outputs a second control signal to the second sub-switch module and enables the second sub-switch module to be conducted, the second sub-switch module outputs a second reference value to the constant current control module, the constant current control module carries out operation on the comparison value and the received second reference value, and the controlled silicon obtains a second holding current when outputting voltage; the detection module outputs a third control signal to the third sub-switch module and enables the third sub-switch module to be conducted, the third sub-switch module outputs a third reference value to the constant current control module, the constant current control module calculates the comparison value and the received third reference value, the thyristor obtains a third holding current when outputting voltage, it is to be noted that the first reference value and the second reference value can be different threshold voltages representing bus parameters, the third reference value is a preset value, the first holding current is not less than the second holding current, the second holding current is not less than the third holding current, and the third holding current is the minimum holding current.
Referring to fig. 2 and 3, the constant current control module further includes a comparison module, a power transistor M, a first resistor R1, and a second resistor R2, a first input end of the comparison module is connected to an output end of the switch module, a second input end of the comparison module and a first end of the first resistor R1 are commonly connected to an output end of the comparison value output module, a second end of the first resistor R1 and a source of the power transistor M are commonly connected to a first end of the second resistor R2, an output end of the comparison module is connected to a gate of the power transistor M, a drain of the power transistor M is connected to the sustain current, a second end of the second resistor R2 is grounded, and constant current control of the sustain current is achieved by turning on and off the power transistor M.
Specifically, the detection module compares the collected bus parameter with a preset threshold value to determine a difference value between the collected bus parameter and the preset threshold value, if the difference value between the collected bus parameter and the preset threshold value is greater than the preset difference value, the detection module outputs a first control signal to the first sub-switch module and enables the first sub-switch module to be switched on, the first sub-switch module outputs a first reference value to the constant current control module, the constant current control module calculates the comparison value and the received first reference value, and the thyristor obtains a first holding current when outputting voltage; if the difference is smaller than the preset difference, or the difference is larger than the preset difference and the LED current is not zero, the detection module outputs a second control signal to the second sub-switch module and enables the second sub-switch module to be conducted, the second sub-switch module outputs a second reference value to the constant current control module, the constant current control module carries out operation on the comparison value and the received second reference value, and the silicon controlled rectifier obtains a second holding current when outputting voltage.
Fig. 4 is a waveform diagram of the variation of the holding current of the thyristor holding current control circuit in the embodiment of the present invention, in which when the thyristor starts to conduct, and the bus voltage is at the rising edge and the difference between the bus voltage and the preset threshold is greater than the preset difference, the thyristor is turned on by a larger holding current (i.e., the first holding current), and then the current is gradually reduced to a minimum holding current (i.e., the second holding current) to ensure the thyristor is turned on stably, so that the loss of the holding current can be effectively reduced, which is beneficial to improving the system efficiency, and meanwhile, when the holding current needs to be improved in consideration of compatibility, the increased loss can be greatly reduced. When the LED current is not zero or the bus voltage is at a falling edge, the controllable silicon is in a conducted state at the moment, and even if the difference value is larger than the preset difference value at the moment, the control module outputs a second control signal to generate a smaller second maintenance current.
Corresponding to the thyristor holding current control method in the embodiment of the present application, the present application also provides a thyristor holding current control circuit, as shown in fig. 2,
the circuit comprises a control module, a comparison value output module and a constant current control module, wherein,
the control module is used for outputting a control signal according to the bus parameter or the LED current of the LED load and selecting a reference value according to the control signal;
the comparison value output module is used for outputting a comparison value according to the bus parameter;
the constant current control module is used for comparing the reference value with the comparison value and outputting a maintaining current according to the comparison result;
wherein the number of the reference values is one or more.
In a specific application scenario, the control module further includes a detection module and a switch module, wherein,
the detection module is used for detecting the bus parameter and the LED current and outputting the control signal;
the switch module is used for determining the reference value according to the control signal;
the detection module comprises a first input end, a second input end and an output end, the first input end of the detection module is connected with the bus, the second input end of the detection module is connected with the LED load, and the output end of the detection module is connected with the switch module.
In a specific application scenario, the constant current control module further includes a comparison module, a power tube, a first resistor and a second resistor, wherein,
the first input end of the comparison module is connected with the output end of the switch module, the second input end of the comparison module and the first end of the first resistor are connected with the output end of the comparison value output module in a shared mode, the second end of the first resistor and the source electrode of the power tube are connected with the first end of the second resistor in a shared mode, the output end of the comparison module is connected with the grid electrode of the power tube, the drain electrode of the power tube is connected with the maintaining current, and the second end of the second resistor is grounded.
In a specific application scenario, the switch module includes a single sub-switch module or a plurality of sub-switch modules connected in parallel, and the number of the sub-switch modules is consistent with the number of the reference values.
By applying the technical scheme, the silicon controlled rectifier maintaining current control circuit comprises a control module, a comparison value output module and a constant current control module, wherein the control module is used for outputting a control signal according to bus parameters or LED current of an LED load and selecting a reference value according to the control signal; the comparison value output module is used for outputting a comparison value according to the bus parameter; the constant current control module is used for comparing the reference value with the comparison value and outputting a maintaining current according to the comparison result; the number of the reference values is one or more, variable maintaining current is generated based on the state of the controllable silicon or the change of bus parameters, and the use range of the controllable silicon is further expanded; when the controllable silicon is conducted, the second maintaining current, namely the minimum maintaining current, is output, so that the loss of the system is further reduced, and the efficiency of the system is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. A thyristor holding current control method is applied to a thyristor holding current control circuit comprising a control module, and the method comprises the following steps: selecting a reference value according to the state of the controllable silicon or the control signal output by the control module;
determining a comparison value according to the product of a bus parameter and a preset coefficient, wherein the bus parameter is bus voltage or bus current;
determining a sustain current based on the reference value and the comparison value, the sustain current being variable;
before selecting the reference value according to the state of the controllable silicon or the control signal output by the control module, the method further comprises the following steps: inputting the bus parameters into the control module;
if the difference value between the bus parameter and a preset threshold value is larger than a preset difference value, outputting a first control signal based on the control module, and taking the first control signal as the control signal;
if the difference value is not larger than the preset difference value, outputting a second control signal based on the control module, and taking the second control signal as the control signal;
before selecting a reference value according to the state of the controllable silicon or the control signal output by the control module, the method also comprises the step of inputting the bus parameter into the control module,
and if the bus voltage is in the drop delay and the difference value is greater than the preset difference value, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
2. The method of claim 1, before selecting the reference value according to a state of the thyristor or a control signal output by the control module, further comprising: inputting the LED current of the LED load into the control module;
and if the difference is larger than the preset difference and the LED current is not zero, outputting the second control signal based on the control module, and taking the second control signal as the control signal.
3. The method according to claim 1, wherein the reference value comprises a first reference value and a second reference value, and the reference value is determined according to a state of the thyristor or a control signal output by the control module, specifically: if the state is a conducting state or the control signal is a first control signal, taking the first reference value as the reference value;
if the state is the turned-on state, taking the first reference value or the second reference value as the reference value;
and if the control signal is a second control signal, taking the second reference value as the reference value.
4. A method according to claim 3, characterized by determining the holding current based on the reference value and the comparison value, in particular by: if the reference value is the first reference value, determining a first maintenance current based on the first reference value and the comparison value, and taking the first maintenance current as the maintenance current;
if the reference value is the second reference value, determining a second holding current based on the second reference value and the comparison value, and taking the second holding current as the holding current;
wherein the first sustain current is not less than the second sustain current.
5. The thyristor maintenance current control circuit is characterized by comprising a control module, a comparison value output module and a constant current control module, wherein the control module is used for outputting a control signal according to bus parameters or LED current of an LED load and selecting a reference value according to the control signal;
the comparison value output module is used for outputting a comparison value according to the bus parameter;
the constant current control module is used for comparing the reference value with the comparison value and outputting a maintaining current according to the comparison result;
wherein the number of the reference values is one or more;
the control module further comprises a detection module and a switch module, the detection module comprises a first input end, a second input end and an output end, the first input end of the detection module is connected with the bus, the second input end of the detection module is connected with the LED load, and the output end of the detection module is connected with the switch module;
the constant current control module further comprises a comparison module, a power tube, a first resistor and a second resistor, wherein the first input end of the comparison module is connected with the output end of the switch module, the second input end of the comparison module and the first end of the first resistor are connected with the output end of the comparison value output module in a shared mode, the second end of the first resistor and the source electrode of the power tube are connected with the first end of the second resistor in a shared mode, the output end of the comparison module is connected with the grid electrode of the power tube, the drain electrode of the power tube is connected with the maintaining current, and the second end of the second resistor is grounded.
6. The circuit of claim 5, wherein the detection module is configured to detect the bus bar parameter and the LED current and output the control signal;
the switch module is used for determining the reference value according to the control signal.
7. The circuit of claim 6, wherein the switching module comprises a single sub-switching module or a plurality of sub-switching modules connected in parallel, the number of sub-switching modules corresponding to the number of reference values.
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