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CN114867155B - LED driving power supply and efficiency adjusting method thereof - Google Patents

LED driving power supply and efficiency adjusting method thereof Download PDF

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Publication number
CN114867155B
CN114867155B CN202110075114.2A CN202110075114A CN114867155B CN 114867155 B CN114867155 B CN 114867155B CN 202110075114 A CN202110075114 A CN 202110075114A CN 114867155 B CN114867155 B CN 114867155B
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amplitude
led driving
efficiency
power supply
control module
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CN114867155A (en
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柳杨
陈志飞
吕海洋
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Inventronics Hangzhou Co Ltd
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Inventronics Hangzhou Co Ltd
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Priority to CN202110075114.2A priority Critical patent/CN114867155B/en
Priority to PCT/CN2021/099093 priority patent/WO2022156122A1/en
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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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The application discloses an LED driving power supply and an efficiency adjusting method thereof, wherein the LED driving power supply comprises a PFC power circuit positioned at the front stage, a DC-DC power circuit positioned at the rear stage, a stable control module and an amplitude control module; the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time so that the bus voltage output by the PFC power circuit is stabilized to be an amplitude target value; the amplitude control module is used for acquiring input parameters and output parameters of the LED driving power supply at regular time, updating and calculating the efficiency of the whole machine, and updating and adjusting an amplitude target value according to a calculation result so as to track the maximum value of the efficiency of the whole machine. The method and the device can adjust the circuit running state of the LED driving power supply towards the direction of increasing the efficiency of the whole machine, realize the tracking of the maximum value of the efficiency of the whole machine, and enable the LED driving power supply to continuously keep the running state of high efficiency and low power consumption under the wide-range input and output application scene.

Description

LED driving power supply and efficiency adjusting method thereof
Technical Field
The application relates to the technical field of electronics, in particular to an LED driving power supply and an efficiency adjusting method thereof.
Background
An LED (Light Emitting Diode) driving power supply is usually implemented by two power stage circuits, i.e., a front-stage PFC power circuit and a rear-stage DC-DC circuit, and sometimes implemented by three power stage circuits.
The main task of a PFC (Power Factor Correction) Power circuit is to change the input current of a driving Power supply to follow the input voltage so that the Power Factor is satisfied, and to output a stable DC voltage to a DC-DC circuit of a subsequent stage, which is called a bus voltage.
Most of the existing LED driving power supplies can only obtain the highest efficiency and the lowest power consumption under the condition of specific input voltage and output voltage/current, and cannot obtain higher efficiency under the working conditions of other input voltage or output voltage/current. In practical applications, in order to meet the requirements of most applications, LED driving power supplies are often operated in a wide range of input voltages and a wide range of output voltages/currents, and thus it is often difficult to maintain high efficiency and low power consumption.
In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
Disclosure of Invention
The application aims to provide an LED driving power supply and an efficiency adjusting method thereof, so that the LED driving power supply can continuously work in a high overall efficiency state through adjustment in a wide-range input and output application occasion, and the power consumption of a circuit is reduced.
In order to solve the technical problem, on one hand, the application discloses an LED driving power supply, which comprises a PFC power circuit located at a front stage, a DC-DC power circuit located at a rear stage, a stability control module and an amplitude control module;
the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time so that the bus voltage output by the PFC power circuit is stabilized to be an amplitude target value;
the amplitude control module is used for acquiring input parameters and output parameters of the LED driving power supply at regular time, updating and calculating the efficiency of the whole machine, and updating and adjusting the target value of the amplitude according to the calculation result so as to track the maximum value of the efficiency of the whole machine.
Optionally, the amplitude control module is specifically configured to, each time the input parameter and the output parameter of the LED driving power supply are obtained and the overall efficiency is updated and calculated:
obtaining an input voltage V of the PFC power circuit in And an input current I in An output voltage V of the DC-DC power circuit o And an output current I o Calculating the current overall efficiency based on a first formula; the first formula is:
η＝V o *I o /(V in *I in )。
optionally, the amplitude control module is specifically configured to, each time the input parameter and the output parameter of the LED driving power supply are obtained and the overall efficiency is updated and calculated:
obtaining the input voltage V of the PFC power circuit in Input current I in And the output bus voltage V bus And bus current I bus Obtaining an output voltage V of the DC-DC power circuit o And an output current I o (ii) a Based on eta a ＝V bus *I bus /(V in *I in ) Calculating PFC output efficiency based on eta b ＝V o *I o /(V bus *I bus ) Calculating DC-DC output efficiency, and calculating the current overall efficiency based on a second formula; the second formula is:
η＝η a * η b 。
optionally, the amplitude control module is specifically configured to, each time the amplitude target value is updated and adjusted according to the calculation result to track the maximum value of the overall efficiency:
if the current overall efficiency is greater than the overall efficiency of the previous period, the result of increasing the target amplitude value by a preset positive value is used as an updated target amplitude value; and if the current overall efficiency is smaller than the overall efficiency of the previous period, reducing the result of the target amplitude value by a preset positive value to serve as the updated target amplitude value.
Optionally, the preset positive value decreases successively.
Optionally, the amplitude control module is specifically configured to:
according to the calculation result, updating and adjusting the amplitude target value in the range of the upper limit and the lower limit of the preset amplitude to realize the tracking of the maximum value of the whole efficiency; the upper and lower limits of the preset amplitude value are used for guaranteeing the normal operation of the PFC power circuit.
Optionally, after the input parameter or the output parameter of the LED driving power supply changes, the amplitude control module suspends the adjustment until the stabilization control module completes the stabilization adjustment of the bus voltage.
Optionally, the stabilization control module further includes a control subunit for adjusting a PFC function of the PFC power circuit.
In yet another aspect, the present application discloses an efficiency adjusting method of an LED driving power supply, which includes a PFC power circuit located at a front stage, a DC-DC power circuit located at a rear stage, a stabilization control module, and an amplitude control module; the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time so that the bus voltage output by the PFC power circuit is stabilized to be an amplitude target value;
the method is applied to the amplitude control module and comprises the following steps:
acquiring input parameters and output parameters of the LED driving power supply at fixed time;
updating and calculating the efficiency of the whole machine according to the input parameters and the output parameters;
and updating and adjusting the amplitude target value according to the calculation result so as to realize the tracking of the maximum value of the whole efficiency.
Optionally, the updating and adjusting the amplitude target value according to the calculation result to achieve tracking of the whole efficiency maximum includes:
judging whether the current complete machine efficiency is equal to the complete machine efficiency of the previous period or not;
if the current amplitude target value is equal to the preset amplitude target value, keeping the current amplitude target value unchanged;
if not, judging whether the current overall efficiency is greater than the overall efficiency of the previous period;
if the amplitude target value is larger than the preset value, the result obtained after the preset positive value is added to the amplitude target value is used as an updated amplitude target value;
and if the amplitude target value is smaller than the preset positive value, taking the result obtained by reducing the amplitude target value by the preset positive value as the updated amplitude target value.
The LED driving power supply and the efficiency adjusting method thereof have the advantages that: according to the method, on one hand, the bus voltage is stabilized to be the amplitude target value based on the stabilization control module, on the other hand, the overall efficiency of the LED driving power supply is continuously detected and calculated based on the amplitude control module, and then the amplitude target value set for the bus voltage is correspondingly adjusted, so that the circuit operation state of the LED driving power supply is adjusted towards the direction of increasing the overall efficiency, the maximum value of the overall efficiency is tracked, and the LED driving power supply is enabled to continuously keep the operation state of high efficiency and low power consumption under the application scene of wide-range input and/or wide-range output.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a block diagram of an LED driving power supply disclosed in an embodiment of the present application;
fig. 2 is a flowchart of an efficiency adjustment method for an LED driving power supply according to an embodiment of the present disclosure;
fig. 3 is a flowchart of an amplitude target value adjustment method disclosed in an embodiment of the present application.
Detailed Description
The core of the application lies in providing an LED driving power supply and an efficiency adjusting method thereof, so that the LED driving power supply can continuously work in a high overall efficiency state through adjustment in a wide-range input and output application occasion, and the power consumption of a circuit is reduced.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, the embodiment of the application discloses an LED driving power supply, which mainly includes a PFC power circuit 101 located at a front stage, a DC-DC power circuit 102 located at a rear stage, a stabilization control module 103, and an amplitude control module 104;
the stabilization control module 103 is configured to adjust, in real time, on/off of a main switching tube in the PFC power circuit 101, so that a bus voltage output by the PFC power circuit 101 is stabilized to an amplitude target value;
the amplitude control module 104 is configured to obtain input parameters and output parameters of the LED driving power supply at regular time, update and calculate the overall efficiency, and update and adjust an amplitude target value according to a calculation result to track the maximum value of the overall efficiency.
Wherein, V in And I in Input voltage and input current of the PFC power circuit 101 (also input voltage and input current of the LED driving power supply), respectively; v bus And I bus The bus voltage and the bus current output by the PFC power circuit 101, respectively; v o And I o Respectively, the output voltage and the output current of the DC-DC power circuit 102 (which is also the output voltage and the output current of the LED driving power supply).
Generally, V in Is determined by the power supply of the application, V o And I o LED lights depending on the user I in Depending on the output power, the input voltage and the losses of the LED driving power supply. The LED driving power source may be used in different input voltage situations, and even if the power grid is connected, the amplitude of the power grid voltage in each country or region is mostly different, and the power grid voltage may fluctuate around its amplitude. In a general constant-power-output LED driving power supply, the output voltage and the output current of the LED driving power supply can be adapted to a plurality of parameters according to the requirements of an LED lamp load.
Specifically, the PFC power circuit 101 is configured to change an input current of the LED driving power supply with an input voltage, so as to achieve the purpose of power factor correction, and output a stable dc voltage — a bus voltage. The DC-DC power circuit 102 is used for DC-DC conversion, and is connected to an LED load to output a voltage and a current suitable for the LED load.
The stability control module 103 may specifically adopt negative feedback closed-loop control, that is, collect the actually output bus voltage in real time and compare the actually output bus voltage with the amplitude target value, and control the on and off of the main switching tube in the PFC power circuit 101 according to the comparison result, and change the bus voltage output by the PFC power circuit 101 through the change of the on time, or the off time, or the period of the main switching tube until the bus voltage is stabilized to the amplitude target value.
It is emphasized that the amplitude control module 104 is also provided to enable high overall efficiency operation under a wide range of input and/or wide range of output conditions. The amplitude control module 104 correspondingly adjusts the amplitude target value according to the actual input/output parameters of the LED driving power, so as to adjust the circuit operating state of the LED driving power toward the direction of increasing the overall efficiency, thereby achieving the tracking of the maximum value of the overall efficiency.
It should be noted that the adjustment of the target amplitude value by the amplitude control module 104 is meaningful after the stabilization control module 103 adjusts the target amplitude value to stabilize the output. It is easy to understand that, when the stabilization control module 103 has not completed stabilization adjustment and the output is not stable and is oscillating in a fluctuation mode, the overall efficiency calculated by the amplitude control module 104 at this time cannot represent the true level of the LED driving power supply.
Therefore, the LED driving power supply disclosed in the embodiment of the present application, on one hand, stabilizes the bus voltage to the target amplitude value based on the stabilization control module, and on the other hand, continuously detects and calculates the overall efficiency of the LED driving power supply based on the amplitude control module, and further, correspondingly adjusts the target amplitude value set for the bus voltage, so as to adjust the circuit operating state of the LED driving power supply toward the direction of increasing the overall efficiency, thereby tracking the maximum overall efficiency value, and continuously maintaining the operating state of high efficiency and low power consumption of the LED driving power supply in the application scenarios of wide-range input and/or wide-range output.
As a specific embodiment, on the basis of the foregoing content, the amplitude control module 104 is specifically configured to, each time the input parameter and the output parameter of the LED driving power are obtained and the overall efficiency is updated and calculated, perform:
obtaining an input voltage V of the PFC power circuit 101 in And an input current I in The output voltage V of the DC-DC power circuit 102 o And an output current I o Calculating the current overall efficiency based on a first formula; the first formula is:
η＝V o *I o /(V in *I in )。
as a specific embodiment, on the basis of the foregoing content, the amplitude control module 104 is specifically configured to, each time the input parameter and the output parameter of the LED driving power are obtained and the overall efficiency is updated and calculated, perform:
obtaining an input voltage V of the PFC power circuit 101 in Input current I in And the output bus voltage V bus And bus current I bus Obtaining the output voltage V of the DC-DC power circuit 102 o And an output current I o (ii) a Based on eta a ＝V bus *I bus /(V in *I in ) Calculating PFC output efficiency based on eta b ＝V o *I o /(V bus *I bus ) Calculating the DC-DC output efficiency, and calculating the current overall efficiency based on a second formula; the second formula is:
η＝η a * η b 。
as a specific embodiment, based on the above, the amplitude control module 104 in the embodiment of the present application is specifically configured to, each time the amplitude target value is updated and adjusted according to the calculation result to track the maximum value of the overall efficiency:
if the current overall efficiency is greater than the overall efficiency of the previous period, the result of increasing the target amplitude value by a preset positive value is used as an updated target amplitude value; and if the current overall efficiency is smaller than the overall efficiency of the previous period, reducing the result of the reduction of the target amplitude value by a preset positive value to serve as the updated target amplitude value.
For example, let the current overall efficiency be written as η 1 Recording the whole machine efficiency of the previous period as eta, recording the amplitude target value before adjustment as Vref, recording the amplitude target value after adjustment as Vref ', recording the variation of the amplitude target value after adjustment as DeltaV = Vref' -Vref, and recording the preset positive value as V 0 >0, the adjusting process specifically comprises:
if eta 1 >η, then let Vref' = Vref + V 0 (ii) a At this time, Δ V = + V 0 The amplitude target value is increased and adjusted;
if eta 1 <Eta, then let Vref' = Vref-V 0 (ii) a At this time,. DELTA.V = -V 0 The value of the negative of the number of the positive,namely, the amplitude target value is subjected to reduction adjustment;
if eta 1 If η, then Vref' = Vref; at this time, vref corresponds to the maximum value of the overall efficiency, and the target value of the amplitude does not need to be adjusted.
As a specific embodiment, the LED driving power supply disclosed in the embodiment of the present application is configured to preset the positive value to be gradually decreased on the basis of the foregoing content. So, the great positive value of predetermineeing of accessible earlier stage accelerates to track the adjustment speed, and the less positive value of predetermineeing of later stage accessible improves the precision, further accelerates to lock complete machine efficiency maximum. Therefore, the embodiment can help the driving power supply powered on for the first time to quickly find the highest point of the overall efficiency under the condition of a certain set of input parameters and output parameters.
As a specific embodiment, on the basis of the foregoing content, the amplitude control module 104 is specifically configured to:
according to the calculation result, updating the target value of the adjustment amplitude within the range of the upper limit and the lower limit of the preset amplitude so as to realize the tracking of the maximum value of the whole efficiency; the upper and lower limits of the preset amplitude value are used for guaranteeing the normal operation of the PFC power circuit 101.
Specifically, the target amplitude value can be always in the range [ V ] bus1 ，V bus2 ]The adjustment is performed internally. Wherein the lower limit value V of the amplitude bus1 And an upper limit value V of amplitude bus2 May be based on enabling the PFC power circuit 101 to operate normally.
For example, when the PFC power stage circuit is a boost circuit, the output voltage (i.e., the bus voltage) of the boost circuit must not be lower than the peak value of the input voltage to ensure the boost circuit operates normally. For another example, when the PFC power stage circuit is a buck circuit, the amplitude of the bus voltage should not be higher than the peak value of the input voltage to ensure the boost circuit operates normally.
Of course, it is easy to understand that, besides ensuring that the PFC power circuit 101 can work normally as a limiting factor, the setting of the upper and lower preset amplitude limits is also limited by the withstand voltage values of the components in the two power circuits.
As a specific embodiment, on the basis of the above content, when the input parameter or the output parameter of the LED driving power changes, the amplitude control module 104 suspends the adjustment until the stabilization control module 103 completes the stabilization adjustment of the bus voltage.
Specifically, when any one of the input voltage, the output voltage, and the output current changes, the operating priority of the stability control module 103 for stabilizing the bus voltage is higher than that of the amplitude control module 104, that is, when the driving power supply is in operation, the adjustment operation of the amplitude control module 104 is suspended first, and after the stability control module 103 stabilizes the bus voltage at the currently set amplitude target value, the amplitude control module 104 starts to operate.
As a specific embodiment, based on the above, the LED driving power supply disclosed in the embodiment of the present application further includes a control subunit for adjusting the PFC function of the PFC power circuit 101, in the stability control module 103.
Specifically, in this embodiment, the stability control module 103 can consider PFC adjustment at the same time, and the average value of the input current can change along with the input voltage in one input voltage period by controlling the amplitude of the switching tube current in one input voltage period.
Referring to fig. 2, an embodiment of the present application discloses a method for adjusting efficiency of an LED driving power supply. The LED driving power supply comprises a PFC power circuit positioned at the front stage, a DC-DC power circuit positioned at the rear stage, a stable control module and an amplitude control module; the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time, so that the bus voltage output by the PFC power circuit is stabilized to an amplitude target value.
The method is applied to an amplitude control module and mainly comprises the following steps:
s201: and acquiring input parameters and output parameters of the LED driving power supply at regular time.
S202: and updating and calculating the efficiency of the whole machine according to the input parameters and the output parameters.
S203: and updating the target value of the adjustment amplitude value according to the calculation result so as to realize the tracking of the maximum value of the efficiency of the whole machine.
Therefore, according to the efficiency adjusting method of the LED driving power supply, on one hand, the bus voltage is stabilized to be the amplitude target value based on the stabilization control module, on the other hand, the overall efficiency of the LED driving power supply is continuously detected and calculated based on the amplitude control module, and then the amplitude target value set for the bus voltage is correspondingly adjusted, so that the circuit operation state of the LED driving power supply is adjusted towards the direction of increasing the overall efficiency, the maximum value of the overall efficiency is tracked, and the LED driving power supply is enabled to continuously keep the operation state of high efficiency and low power consumption under the application scenes of wide-range input and/or wide-range output.
For details of the efficiency adjustment method of the LED driving power supply, reference may be made to the foregoing detailed description of the LED driving power supply, and details thereof are not repeated here.
Referring to fig. 3, fig. 3 is a flowchart of an amplitude target value adjustment method disclosed in an embodiment of the present application, and mainly includes:
s301: judging whether the current complete machine efficiency is equal to the complete machine efficiency of the previous period or not; if yes, entering S302; if not, the process proceeds to S303.
S302: the current amplitude target value is kept unchanged.
S303: judging whether the current overall efficiency is greater than that of the previous period or not; if yes, entering S304; if not, the process proceeds to S305.
S304: and the result of increasing the target amplitude value by a preset positive value is used as the updated target amplitude value.
S305: and reducing the result of the reduction of the target amplitude value by a preset positive value to be used as the updated target amplitude value.
As a specific embodiment, in the method for adjusting the efficiency of the LED driving power supply provided in the embodiment of the present application, on the basis of the above, the preset positive value is gradually decreased.
As a specific embodiment, the method for adjusting efficiency of an LED driving power provided in the embodiment of the present application, based on the above contents, obtains input parameters and output parameters of the LED driving power, and updates and calculates overall efficiency, specifically including:
obtaining input voltage V of PFC power circuit in And an input current I in Output voltage V of DC-DC power circuit o And an output current I o ；
Calculating the current overall efficiency based on a first formula; the first formula is:
η＝V o *I o /(V in *I in )。
as a specific embodiment, the method for adjusting efficiency of an LED driving power supply provided in the embodiment of the present application, based on the above contents, obtains input parameters and output parameters of the LED driving power supply, and updates and calculates overall efficiency, specifically including:
obtaining input voltage V of PFC power circuit in Input current I in And the output bus voltage V bus And bus current I bus ；
Obtaining an output voltage V of a DC-DC power circuit o And an output current I o ；
Based on eta a ＝V bus *I bus /(V in *I in ) Calculating the PFC output efficiency;
based on eta b ＝V o *I o /(V bus *I bus ) Calculating the DC-DC output efficiency;
calculating the current overall efficiency based on a second formula; the second formula is:
η＝η a * η b 。
as a specific embodiment, the method for adjusting efficiency of an LED driving power supply according to the embodiment of the present application updates an adjustment amplitude target value according to a calculation result to track a maximum value of overall efficiency on the basis of the foregoing contents, and specifically includes:
according to the calculation result, updating the target value of the adjustment amplitude value within the range of the upper limit and the lower limit of the preset amplitude value so as to realize the tracking of the maximum value of the whole efficiency; the upper and lower limits of the amplitude are preset to ensure the normal operation of the PFC power circuit.
As a specific embodiment, in the method for adjusting efficiency of an LED driving power provided in the embodiment of the present application, on the basis of the above contents, when an input parameter or an output parameter of the LED driving power changes, the amplitude control module suspends the adjustment until the stabilization control module completes the stable adjustment of the bus voltage.
The embodiments 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. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "...," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the present application.

Claims (8)

1. An LED driving power supply is characterized by comprising a PFC power circuit positioned at a front stage, a DC-DC power circuit positioned at a rear stage, a stability control module and an amplitude control module;
the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time so that the bus voltage output by the PFC power circuit is stabilized to be an amplitude target value;
the amplitude control module is used for acquiring input parameters and output parameters of the LED driving power supply at regular time, updating and calculating the efficiency of the whole machine, and updating and adjusting the target value of the amplitude according to the calculation result so as to realize the tracking of the maximum value of the efficiency of the whole machine;
the amplitude control module is specifically configured to, when updating and adjusting the amplitude target value according to the calculation result each time to track the overall efficiency maximum:
if the current overall efficiency is greater than the overall efficiency of the previous period, the result of increasing the target amplitude value by a preset positive value is used as an updated target amplitude value; and if the current overall efficiency is smaller than the overall efficiency of the previous period, reducing the result of the reduction of the target amplitude value by a preset positive value to serve as the updated target amplitude value.
2. The LED driving power supply according to claim 1, wherein the amplitude control module is specifically configured to, each time the input parameters and the output parameters of the LED driving power supply are obtained and the overall efficiency is updated and calculated:
obtaining an input voltage V of the PFC power circuit in And an input current I in An output voltage V of the DC-DC power circuit o And an output current I o Calculating the current overall efficiency based on a first formula; the first formula is:
η＝V o *I o /(V in *I in )。
3. the LED driving power supply of claim 1, wherein the amplitude control module is specifically configured to, each time the input parameters and the output parameters of the LED driving power supply are obtained and the overall efficiency is updated:
obtaining an input voltage V of the PFC power circuit in Input current I in And the output bus voltage V bus And bus current I bus Obtaining an output voltage V of the DC-DC power circuit o And an output current I o (ii) a Based on eta a ＝V bus *I bus /(V in *I in ) Calculating PFC output efficiency based on eta b ＝V o *I o /(V bus *I bus ) Calculating DC-DC output efficiency, and calculating the current overall efficiency based on a second formula; the second formula is:
η＝η a * η b 。
4. the LED driving power supply according to claim 1, wherein the predetermined positive value decreases successively.
5. The LED driving power supply according to claim 1, wherein the amplitude control module is specifically configured to:
according to the calculation result, updating and adjusting the amplitude target value in the range of the upper limit and the lower limit of the preset amplitude to realize the tracking of the maximum value of the whole efficiency; the upper and lower limits of the preset amplitude value are used for guaranteeing the normal operation of the PFC power circuit.
6. The LED driving power supply according to claim 1, wherein after the input parameter or the output parameter of the LED driving power supply is changed, the amplitude control module suspends the adjustment until the stabilization control module completes the stabilization adjustment of the bus voltage.
7. The LED driving power supply according to any one of claims 1 to 6, wherein the stabilization control module further comprises a control subunit for adjusting a PFC function of the PFC power circuit.
8. The efficiency adjusting method of the LED driving power supply is characterized in that the LED driving power supply comprises a PFC power circuit positioned at a front stage, a DC-DC power circuit positioned at a rear stage, a stability control module and an amplitude control module; the stability control module is used for adjusting the on-off of a main switching tube in the PFC power circuit in real time so that the bus voltage output by the PFC power circuit is stabilized to be an amplitude target value;
the method is applied to the amplitude control module and comprises the following steps:
acquiring input parameters and output parameters of the LED driving power supply at fixed time;
updating and calculating the efficiency of the whole machine according to the input parameters and the output parameters;
updating and adjusting the amplitude target value according to the calculation result to realize the tracking of the maximum value of the whole efficiency;
the updating and adjusting the amplitude target value according to the calculation result to realize the tracking of the maximum value of the whole efficiency comprises the following steps:
judging whether the current complete machine efficiency is equal to the complete machine efficiency of the previous period or not;
if the current amplitude target value is equal to the preset amplitude target value, keeping the current amplitude target value unchanged;
if not, judging whether the current overall efficiency is greater than the overall efficiency of the previous period;
if the amplitude target value is larger than the preset positive value, taking the result obtained after the preset positive value is added to the amplitude target value as an updated amplitude target value;
and if the amplitude target value is smaller than the preset positive value, taking the result obtained by reducing the amplitude target value by the preset positive value as the updated amplitude target value.
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