CN113489300A - Switch power supply capacitive load starting method and switch power supply - Google Patents
Switch power supply capacitive load starting method and switch power supply Download PDFInfo
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- CN113489300A CN113489300A CN202110654601.4A CN202110654601A CN113489300A CN 113489300 A CN113489300 A CN 113489300A CN 202110654601 A CN202110654601 A CN 202110654601A CN 113489300 A CN113489300 A CN 113489300A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention relates to a switch power supply capacitive load startup method and a switch power supply, comprising the following steps: after the switching power supply is powered on, the secondary side main control unit judges whether a starting-up enabling signal is received or not; if yes, the secondary side main control unit controls the soft start control module to start; in the starting process of the soft start control module, monitoring an output signal of a switching power supply in real time to obtain an output sampling signal; and controlling the soft start of the switching power supply according to the output sampling signal. In the starting process of the switching power supply, the output voltage of the switching power supply is controlled to slowly climb based on the output current and the output voltage, so that the problem of overlarge current at the moment of starting a large capacitive load is solved, the hardware cost of a system cannot be increased in a software control mode, the risk that the stress of a switching tube of the power supply is damaged due to serious impact does not exist, the reliability of the power supply can be obviously improved, the adaptability of the power supply is improved, and the power supply can be suitable for different large capacitive loads.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a capacitive load starting method of a switching power supply and the switching power supply.
Background
With the rapid development of electronic circuit technology, the functional load of an electronic system is more and more powerful, the power demand on a power supply is also more and more large, and currently, an N + M redundant parallel working mode is generally adopted for a high-power system, so that a large amount of capacitive loads are generated on the N + M system. When the parallel redundancy of N + M supplies power simultaneously, because the difference of hardware circuit, not all (N + M) power supplies are supplied power to the output simultaneously, will bring the difficult problem for power supply design like this: the power supply of the N + M parallel system which is firstly powered on needs to carry the capacitive load of the whole system to start the machine.
At the moment of power-up, the current of the capacitive load is theoretically infinite. At present, common methods for solving the problem of large capacitive load starting include: a hardware soft start buffer circuit and software are introduced to filter in a start-up delay mode, so that the protection of a power supply at the start moment is avoided. The former solution introduces a cost increase to the system, and the latter solution brings severe impact to the stress of the switching tube of the power supply, with the risk of damage.
Disclosure of Invention
The present invention provides a method for starting a capacitive load of a switching power supply and a switching power supply, which are directed to overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for starting a capacitive load of a switching power supply is constructed, and comprises the following steps:
after the switching power supply is powered on, the secondary side main control unit judges whether a starting-up enabling signal is received or not;
if yes, the secondary side main control unit controls the soft start control module to start;
in the starting process of the soft start control module, monitoring an output signal of a switching power supply in real time to obtain an output sampling signal;
and controlling the soft start of the switching power supply according to the output current sampling signal.
In the method for starting up the capacitive load of the switching power supply, the method further includes:
after the switching power supply is powered on, the primary side main control unit collects input voltage in real time;
the primary side main control unit controls PFC output voltage according to the input voltage and judges whether the PFC output voltage is larger than or equal to a PFC preset value;
and if so, the primary side main control unit outputs the starting-up enabling signal to the secondary side main control unit.
In the method for starting up the capacitive load of the switching power supply, the method further includes:
if the starting-up enabling signal is received, the secondary side main control unit detects the working state of the secondary side of the switching power supply;
and if the working state of the secondary side meets the starting condition, controlling the soft starting control module to start.
In the method for starting up the capacitive load of the switching power supply, the outputting the sampling signal includes: outputting a current sampling signal and a voltage sampling signal;
the controlling the soft start of the switching power supply according to the output sampling signal comprises:
the secondary side main control unit acquires the output current sampling signal;
judging whether the output current is greater than a threshold value according to the output current sampling signal;
if so, controlling the soft start of the switching power supply by adopting a first soft start mode;
if not, controlling the soft start of the switching power supply by adopting a second soft start mode.
In the method for starting up the capacitive load of the switching power supply, the controlling the soft start of the switching power supply by adopting a first software starting mode includes:
the soft start control module controls the start of the secondary constant current loop control module;
after the constant current loop control module is started, acquiring a first control quantity output by the constant current loop control module;
and controlling the output voltage of the switching power supply according to the first control quantity.
In the method for starting up the capacitive load of the switching power supply, the controlling the output voltage of the switching power supply according to the first control quantity includes:
sending the first control quantity to a voltage loop control module of the switching power supply;
the voltage ring control module superposes the first control quantity and the second control quantity, and calculates and controls the frequency value of the output voltage of the switching power supply according to the superposed control quantity; the second control quantity is the control quantity output by the voltage loop control module;
and controlling the output voltage of the switching power supply according to the frequency value.
In the method for starting up the capacitive load of the switching power supply, the controlling the soft start of the switching power supply by using a second soft start mode includes:
controlling a step amount of an output voltage of the switching power supply;
the voltage loop control module calculates and controls the frequency value of the output voltage of the switching power supply according to the stepping amount of the output voltage;
and controlling the output voltage of the switching power supply according to the frequency value.
In the method for starting up the capacitive load of the switching power supply, after the controlling the output voltage of the switching power supply according to the frequency value, the method includes:
monitoring the real-time output voltage of the switching power supply;
judging whether the real-time output voltage is greater than or equal to a target voltage value;
if so, completing the soft start of the switching power supply;
and if not, continuously monitoring the output current of the switching power supply.
The present invention also provides a switching power supply, comprising: the device comprises a primary side main control unit, a primary side sampling unit, a PFC control unit, a secondary side main control unit and a secondary side sampling unit;
the primary side sampling unit is used for monitoring the input voltage of the switching power supply in real time after the switching power supply is powered on and outputting an input voltage sampling signal;
the primary side main control unit is connected with the primary side sampling unit, receives the input voltage sampling signal, controls the PFC control unit according to the input voltage sampling signal, and outputs a starting-up enabling signal when the PFC output voltage of the PFC control unit is greater than or equal to a PFC preset value;
the secondary side sampling unit is used for monitoring the output current of the switching power supply in real time to obtain an output sampling signal;
and the secondary main control unit is communicated with the primary main control unit and is used for controlling the soft start of the switching power supply according to the output sampling signal when receiving the starting enabling signal.
In the switching power supply of the present invention, the switching power supply further includes: an optoelectronic communication module; the secondary side main control unit comprises: the soft start control module, the constant current loop control module and the voltage loop control module;
the photoelectric communication module is respectively connected with the primary side main control unit and the secondary side main control unit and is used for communicating the primary side main control unit and the secondary side main control unit;
the soft start control module is used for starting soft start control when the secondary side main control unit receives the starting enabling signal;
the constant current loop control module is used for performing constant current loop control according to the control of the soft start control module;
and the voltage ring control module is used for adjusting the output voltage of the switching power supply according to the control of the soft start control module.
The implementation of the switch power supply capacitive load startup method and the switch power supply has the following beneficial effects: the method comprises the following steps: after the switching power supply is powered on, the secondary side main control unit judges whether a starting-up enabling signal is received or not; if yes, the secondary side main control unit controls the soft start control module to start; in the starting process of the soft start control module, monitoring an output signal of a switching power supply in real time to obtain an output current sampling signal; and controlling the soft start of the switching power supply according to the output sampling signal. In the starting process of the switching power supply, the output current and the output voltage are monitored in real time, the output voltage of the switching power supply is controlled to slowly climb based on the output current and the output voltage, the problem of overlarge current at the moment of starting a large capacitive load is solved, the hardware cost of a system is not increased in a software control mode, the risk that a switching tube of the power supply is damaged due to serious impact on stress does not exist, the reliability of the power supply can be obviously improved, the adaptability of the power supply is improved, and the method and the device are suitable for different large capacitive loads.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic flowchart of a first embodiment of a method for starting a capacitive load of a switching power supply according to the present invention;
fig. 2 is a schematic flowchart of a second embodiment of a switch power supply capacitive load startup method provided in the present invention;
fig. 3 is a schematic flowchart of a third embodiment of a switch power supply capacitive load startup method provided by the present invention;
fig. 4 is a schematic block diagram of an alternative embodiment of the switching power supply provided by the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flowchart of a first embodiment of a method for starting a capacitive load of a switching power supply according to the present invention.
As shown in fig. 1, the method for starting the capacitive load of the switching power supply includes the following steps:
in step S11, after the switching power supply is powered on, the secondary main control unit 105 determines whether the power-on enable signal is received.
In some embodiments, before step S11, the method further includes:
step S101, after the switching power supply is powered on, the primary side main control unit 103 collects input voltage in real time.
In step S102, the primary side main control unit 103 controls the PFC output voltage according to the input voltage, and determines whether the PFC output voltage is greater than or equal to a PFC preset value.
Step S103, if yes, the primary side main control unit 103 outputs a power-on enable signal to the secondary side main control unit 105.
In step S12, if yes, the secondary side main control unit 105 controls the soft start control module 1051 to start.
In some embodiments, before step S12, the method further includes:
in step S12-01, if the power-on enable signal is received, the secondary main control unit 105 detects the operating state of the secondary side of the switching power supply. The working state of the secondary side includes, but is not limited to, the temperature of the secondary side, a given signal of an external system, a control signal of the system itself, and the like. For example, if the temperature is too high, the secondary side does not start the output at this time. Or, the given signal of the external system or the control signal of the system itself requires that the system cannot be started, and the secondary side does not start the output at this time.
And step S12-02, if the working state of the secondary side meets the starting condition, controlling the soft start control module 1051 to start.
Optionally, the start-up condition includes, but is not limited to, that the temperature is lower than a preset temperature (the preset temperature is set according to the requirement of the product), and that a given signal of the external system or a control signal of the system itself is allowable to start up.
In the embodiment of the present invention, after the secondary side main control unit 105 receives the power-on enable signal sent by the primary side main control unit 103, the flag bit (Bulk _ OK) of the secondary side is set to 1, and meanwhile, the working state of the secondary side is determined, and if there is no abnormality, the soft start control module 1051 is controlled to start.
Step S13, during the start-up process of the soft start control module 1051, the output signal of the switching power supply is monitored in real time to obtain an output sampling signal. Optionally, in an embodiment of the present invention, outputting the sampling signal includes: and outputting a current sampling signal and a voltage sampling signal.
And step S14, controlling the soft start of the switching power supply according to the output sampling signal.
In some embodiments, as shown in fig. 2, the step S14 of controlling the soft start of the switching power supply according to the output sampling signal includes:
in step S141, the secondary main control unit 105 determines whether the output current is greater than the threshold value according to the output current sampling signal.
And S142, if so, controlling the soft start of the switching power supply by adopting a first soft start mode.
In some embodiments, as shown in fig. 3, the step S142 of controlling the soft start of the switching power supply by using the first software start mode includes:
in step S1421, the soft start control module 1051 controls the secondary constant current loop control module 1052 to start.
In step S1422, after the constant current loop control module 1052 is started, a first control amount output by the constant current loop control module 1052 is acquired. The first control quantity is a control quantity determined by the constant current loop control module 1052 through analysis, calculation and processing according to the output current sampling signal.
Step S1423, controlling an output voltage of the switching power supply according to the first control amount.
Optionally, controlling the output voltage of the switching power supply according to the first control quantity includes: sending the first control quantity to a voltage loop control module 1053 of the switching power supply; the voltage ring control module 1053 superposes the first control quantity and the second control quantity, and calculates the frequency value of the output voltage of the control switch power supply according to the superposed control quantity; and controlling the output voltage of the switching power supply according to the frequency value. And the second control quantity is the control quantity output by the voltage ring control module. It should be noted that the control amount in the embodiment of the present invention is a voltage step value for adjusting the output voltage of the power supply.
Further, as shown in fig. 3, step S1423 is followed by:
step S1424, monitoring a real-time output voltage of the switching power supply.
Step S1425, determine whether the real-time output voltage is greater than or equal to the target voltage value.
Step S1426, if yes, completing the soft start of the switching power supply; if not, the output current of the switching power supply is continuously monitored.
In the embodiment of the present invention, in the starting process of the soft start control module 1051, if the monitored output current is greater than the threshold, the output current is marked at position 1, and the constant current loop control module 1052 is started at the same time, so that the output current is kept constant by the constant current control function of the constant current loop control module 1052, thereby avoiding triggering the short circuit protection of the power supply. When the monitored output current is smaller than the threshold value, the flag position of the output current is set to be 0, and at the moment, the soft start of the output voltage is started according to a normal starting mode, namely, the soft start is controlled by adopting a second soft starting mode.
And step S143, if not, controlling the soft start of the switching power supply by adopting a second soft start mode.
In some embodiments, as shown in fig. 3, the step S143 of controlling the soft start of the switching power supply by using the second soft start mode includes:
and step S1431, controlling the stepping amount of the output voltage of the switching power supply.
In step S1432, the voltage loop control module 1053 calculates a frequency value of the output voltage of the control switching power supply according to the step amount of the output voltage.
And step S1433, controlling the output voltage of the switching power supply according to the frequency value.
Further, as shown in fig. 3, step S1433 is followed by:
and step S1434, monitoring the real-time output voltage of the switching power supply.
Step S1435 determines whether the real-time output voltage is greater than or equal to the target voltage value.
Step S1436, if yes, soft start of the switching power supply is finished; if not, the output current of the switching power supply is continuously monitored.
Further, in the embodiment of the present invention, after the soft start of the switching power supply is completed, the soft start control module 1051 controls the constant current loop control module 1052 to close, so as to prevent the output voltage from generating an unstable phenomenon due to the false triggering of the constant current loop when the system is in a large dynamic load, and reduce the reliability of the power supply.
Referring to fig. 4, a schematic block diagram of an alternative embodiment of the switching power supply of the present invention is shown.
The switch power supply can adopt the switch power supply capacitive load startup method disclosed by the embodiment of the invention to realize soft startup.
Specifically, the switching power supply includes: a primary side main control unit 103, a primary side sampling unit 101, a PFC control unit 102, a secondary side main control unit 105, and a secondary side sampling unit 106.
The primary side sampling unit 101 is configured to monitor an input voltage of the switching power supply in real time after the switching power supply is powered on, and output an input voltage sampling signal.
The primary side main control unit 103 is connected with the primary side sampling unit 101, receives the input voltage sampling signal, controls the PFC control unit 102 according to the input voltage sampling signal, and outputs a power-on enable signal when the PFC output voltage of the PFC control unit 102 is greater than or equal to the PFC preset value.
The secondary side sampling unit 106 is configured to monitor an output signal of the switching power supply in real time to obtain an output sampling signal.
The secondary main control unit 105 is in communication with the primary main control unit 103 and is configured to control the soft start of the switching power supply according to the output sampling signal when receiving the power-on enable signal.
Further, as shown in fig. 4, the switching power supply further includes: an optoelectronic communication module 104. The secondary side master control unit 105 includes: a soft start control module 1051, a constant current loop control module 1052, and a voltage loop control module 1053. Optionally, in the embodiment of the present invention, the voltage loop control module 1053, the constant current loop control module 1052, and the soft start control module 107 may be embedded in the secondary main control unit 105, or may exist as independent modules.
Further, in the embodiment of the present invention, the primary side main control unit 103 and the secondary side main control unit 105 may both adopt DSP processors.
The photoelectric communication module 104 is connected to the primary side main control unit 103 and the secondary side main control unit 105, respectively, and is used for the primary side main control unit 103 and the secondary side main control unit 105 to communicate. Alternatively, the optoelectronic communication module 104 may include, but is not limited to, an opto-coupler.
The soft-start control module 1051 is configured to start soft-start control when the secondary side master control unit 105 receives the power-on enable signal. Specifically, when the first soft start mode is adopted to control the soft start of the switching power supply, the soft start control module 1051 controls the start of the constant current loop control module 1052, and the superposition control is performed through the constant current loop control module 1052 and the voltage loop control module 1053; when the second soft start mode is adopted to control the soft start of the switching power supply, the soft start control module 1051 controls the voltage loop control module 1053 to start, at the moment, the constant current loop control module 1052 does not work, and closed-loop control is performed through the voltage loop control module 1053.
The constant current loop control module 1052 is used for performing constant current loop control according to the control of the soft start control module 1051. Specifically, under the constant current control action of the constant current loop control module 1052, when the output current of the switching power supply is greater than a threshold value, the output current is reduced, so that the output current is constant, and the short-circuit protection of the power supply is avoided. It is to be appreciated that the constant current loop control module 1052 does not need to be enabled when the output current is less than the threshold.
The voltage loop control module 1053 is used for controlling the output voltage of the switching power supply according to the stepping amount of the output voltage output by the soft start control module 1051 or the first control amount output by the constant current loop control module 1052. Specifically, when the output current is smaller than the threshold, the voltage loop control module 1053 calculates a frequency value for controlling the output voltage of the switching power supply according to the step amount of the output voltage of the switching power supply output by the secondary main control unit 105, controls the output voltage of the switching power supply according to the calculated frequency value of the output voltage, and performs closed-loop control on the output voltage according to the output voltage sampling signal, thereby achieving the purpose of soft start. Or, when the output current is greater than the threshold, the voltage loop control module 1053 controls the output voltage of the switching power supply according to the first control quantity output by the constant current loop control module 1052 and the second control quantity generated by itself according to the output voltage sampling signal. That is, the voltage loop control module 1053 calculates a frequency value of the output voltage of the switching power supply according to the first control amount and the second control amount, and controls the output voltage of the switching power supply according to the calculated frequency value of the output voltage.
Further, in the embodiment of the present invention, after the power soft start is completed, the secondary main control unit 105 further controls the constant current loop control module 1052 to be turned off, so as to prevent the output voltage from generating an unstable phenomenon when the constant current loop is triggered by mistake when the system is in a large dynamic load, which may reduce the reliability of the power.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A method for starting a capacitive load of a switching power supply is characterized by comprising the following steps:
after the switching power supply is powered on, the secondary side main control unit judges whether a starting-up enabling signal is received or not;
if yes, the secondary side main control unit controls the soft start control module to start;
in the starting process of the soft start control module, monitoring an output signal of a switching power supply in real time to obtain an output sampling signal;
and controlling the soft start of the switching power supply according to the output sampling signal.
2. The method for starting the capacitive load of the switching power supply according to claim 1, further comprising:
after the switching power supply is powered on, the primary side main control unit collects input voltage in real time;
the primary side main control unit controls PFC output voltage according to the input voltage and judges whether the PFC output voltage is larger than or equal to a PFC preset value;
and if so, the primary side main control unit outputs the starting-up enabling signal to the secondary side main control unit.
3. The method for starting the capacitive load of the switching power supply according to claim 1, further comprising:
if the starting-up enabling signal is received, the secondary side main control unit detects the working state of the secondary side of the switching power supply;
and if the working state of the secondary side meets the starting condition, controlling the soft starting control module to start.
4. The capacitive load starting method of claim 1, wherein outputting the sampling signal comprises: outputting a current sampling signal and a voltage sampling signal;
the controlling the soft start of the switching power supply according to the output sampling signal comprises:
the secondary side main control unit acquires the output current sampling signal;
judging whether the output current is greater than a threshold value according to the output current sampling signal;
if so, controlling the soft start of the switching power supply by adopting a first soft start mode;
if not, controlling the soft start of the switching power supply by adopting a second soft start mode.
5. The capacitive load startup method for the switching power supply according to claim 4, wherein the controlling the soft start of the switching power supply by using the first software start-up manner comprises:
the soft start control module controls the start of the secondary constant current loop control module;
after the constant current loop control module is started, acquiring a first control quantity output by the constant current loop control module;
and controlling the output voltage of the switching power supply according to the first control quantity.
6. The capacitive load startup method for the switching power supply according to claim 5, wherein the controlling the output voltage of the switching power supply according to the first control quantity comprises:
sending the first control quantity to a voltage loop control module of the switching power supply;
the voltage ring control module superposes the first control quantity and the second control quantity, and calculates and controls the frequency value of the output voltage of the switching power supply according to the superposed control quantity; the second control quantity is the control quantity output by the voltage loop control module;
and controlling the output voltage of the switching power supply according to the frequency value.
7. The capacitive load startup method for the switching power supply according to claim 4, wherein the controlling the soft start of the switching power supply by using the second soft start mode comprises:
controlling a step amount of an output voltage of the switching power supply;
the voltage loop control module calculates and controls the frequency value of the output voltage of the switching power supply according to the stepping amount of the output voltage;
and controlling the output voltage of the switching power supply according to the frequency value.
8. The method for starting up the capacitive load of the switching power supply according to claim 6 or 7, wherein the controlling the output voltage of the switching power supply according to the frequency value comprises:
monitoring the real-time output voltage of the switching power supply;
judging whether the real-time output voltage is greater than or equal to a target voltage value;
if so, completing the soft start of the switching power supply;
and if not, continuously monitoring the output current of the switching power supply.
9. A switching power supply, comprising: the device comprises a primary side main control unit, a primary side sampling unit, a PFC control unit, a secondary side main control unit and a secondary side sampling unit;
the primary side sampling unit is used for monitoring the input voltage of the switching power supply in real time after the switching power supply is powered on and outputting an input voltage sampling signal;
the primary side main control unit is connected with the primary side sampling unit, receives the input voltage sampling signal, controls the PFC control unit according to the input voltage sampling signal, and outputs a starting-up enabling signal when the PFC output voltage of the PFC control unit is greater than or equal to a PFC preset value;
the secondary side sampling unit is used for monitoring the output signal of the switching power supply in real time to obtain an output sampling signal;
and the secondary main control unit is communicated with the primary main control unit and is used for controlling the soft start of the switching power supply according to the output sampling signal when receiving the starting enabling signal.
10. The switching power supply according to claim 9, further comprising: an optoelectronic communication module; the secondary side main control unit comprises: the soft start control module, the constant current loop control module and the voltage loop control module;
the photoelectric communication module is respectively connected with the primary side main control unit and the secondary side main control unit and is used for communicating the primary side main control unit and the secondary side main control unit;
the soft start control module is used for starting soft start control when the secondary side main control unit receives the starting enabling signal;
the constant current loop control module is used for performing constant current loop control according to the control of the soft start control module;
and the voltage ring control module is used for adjusting the output voltage of the switching power supply according to the control of the soft start control module.
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