CN105207465A - Total harmonic distortion optimizing circuit and method - Google Patents
Total harmonic distortion optimizing circuit and method Download PDFInfo
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- CN105207465A CN105207465A CN201510667366.9A CN201510667366A CN105207465A CN 105207465 A CN105207465 A CN 105207465A CN 201510667366 A CN201510667366 A CN 201510667366A CN 105207465 A CN105207465 A CN 105207465A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a total harmonic distortion optimizing circuit and method. The total harmonic distortion optimizing circuit is applied to an active power-factor correction LED driving system and comprises a rectifier bridge and an LED driving chip. Two input ends of the rectifier bridge are connected with an input mains supply, and the output end of the rectifier bridge is electrically connected to the LED driving chip. The circuit comprises a mains supply phase position collection module. The input end of the mains supply phase position collection module is coupled to the rectifier bridge, the output end of the mains supply phase position collection module is electrically connected to the input end of a total harmonic distortion compensation module, and the mains supply phase position collection module is used for collecting the phase position of the input mains supply in real time and transmitting the phase position to the total harmonic distortion compensation module. The output end of the total harmonic distortion compensation module is connected with the input end of a power-factor compensation loop arranged in the LED driving chip, and the total harmonic distortion compensation module is used for providing the phase position information to the power-factor compensation loop in real time. Closed-loop control is adopted in the LED driving chip, the phase difference existing between working input and mains supply input of the LED driving system is calibrated according to the phase position information so as to reduce total harmonic distortion. By the adoption of the circuit and method, high power factors and extremely-low total harmonic distortion are achieved.
Description
Technical field
The present invention relates to the low total harmonic distortion applied technical field of LED illumination High Power Factor in Switching Power Supply, particularly relate to the circuit topological structure be applicable to based on the step-down (Buck) of Active Power Factor Correction, buck (Buckboost) and inverse-excitation type (Flyback), and be applicable to the framework on the spot of these topological structure current control loops and a kind of total harmonic distortion optimization circuit of floating ground framework and method.
Background technology
The mains-supplied power supply that present resident uses is alternating current, and LED needs by direct current driven, becomes LED popularize a problem that must solve in process so how alternating current to be converted to direct current for LED.In the past, address this problem, direct current corresponding to alternating current convert to often by LED drive power; And when use LED drive power, in order to avoid LED drive power is to the interference of utility grid, so just need to formulate corresponding standard to carry out specification LED drive power, and when will realize the standard of this specification LED drive power use, certain index must be met, as: power factor is greater than 0.9, and total harmonic distortion is less than 20% etc.
Active Power Factor Correction (ActivePowerFactorCorrection, being called for short APFC) object of LED drive chip is utilance in order to improve electrical network, total harmonic distortion (TotalHarmonicDistortion is called for short THD) is the important indicator weighing this purpose.But LED drives the objective reality of non-linear speciality, in conventional total head range applications, (85 ~ 265V) total harmonic distortion is difficult to meet the requirement being less than 20%.Although by the topological structure that converting power source controls, such as, change buck-boost type topology into from voltage-dropping type topology, the result of total harmonic distortion does not possess enough surpluses and produces for client.
Therefore, seek a kind of total harmonic distortion optimization mode realizing the low total harmonic distortion of LED illumination High Power Factor, total harmonic distortion is reached meet in total head range applications to be less than 20% even lower, tool is of great significance.
Summary of the invention
The object of the invention is to, for the technical problem that the total harmonic distortion existed in prior art Active Power Factor Correction is higher, a kind of Active Power Factor Correction total harmonic distortion optimization circuit and method are provided, realize the low total harmonic distortion of LED illumination High Power Factor.
For achieving the above object, the invention provides a kind of total harmonic distortion optimization circuit, be applied to Active Power Factor Correction LED drive system, described LED drive system comprises rectifier bridge and LED drive chip, two inputs of described rectifier bridge are connected with input civil power, the output of described rectifier bridge is electrically connected to described LED drive chip, and described circuit comprises: civil power phase acquisition module and total harmonic distortion compensating module; The input of described civil power phase acquisition module is coupled to described rectifier bridge, the output of described civil power phase acquisition module is electrically connected to the input of described total harmonic distortion compensating module, and described civil power phase acquisition module is used for the phase place of Real-time Collection input civil power and is sent to described total harmonic distortion compensating module; The output of described total harmonic distortion compensating module is connected with the input in the power factor compensation loop be arranged in LED drive chip, for providing described phase information to described power factor compensation loop in real time; Described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.
For achieving the above object, present invention also offers a kind of total harmonic distortion optimization method, be applied to Active Power Factor Correction LED drive system, described LED drive system comprises rectifier bridge and LED drive chip, two inputs of described rectifier bridge are connected with input civil power, the output of described rectifier bridge is electrically connected to described LED drive chip, comprising: (1) Real-time Collection inputs the phase place of civil power and is sent to a total harmonic distortion compensating module; (2) described total harmonic distortion compensating module provides the input in the power factor compensation loop of described phase information to being arranged in LED drive chip in real time; (3) described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.
The invention has the advantages that: the present invention provides the phase information expensive chip of input voltage inner integrated active power rectification building-out loop by peripheral circuit on Active Power Factor Correction LED drive chip typical apply basis, obtain High Power Factor and extremely low total harmonic distortion, provide very reliable and stable high performance-price ratio total harmonic distortion solution, and be applicable to multiple active power correction LED drive chip.
Accompanying drawing explanation
Figure 1A, total harmonic distortion optimization circuit one execution mode configuration diagram of the present invention;
Figure 1B, another execution mode configuration diagram of total harmonic distortion optimization circuit of the present invention;
Fig. 2, circuit diagram described in total harmonic distortion optimization circuit first embodiment of the present invention;
Fig. 3, circuit diagram described in total harmonic distortion optimization circuit second embodiment of the present invention;
Fig. 4, circuit diagram described in total harmonic distortion optimization circuit the 3rd embodiment of the present invention;
Fig. 5, circuit diagram described in total harmonic distortion optimization circuit the 4th embodiment of the present invention;
Fig. 6, circuit diagram described in total harmonic distortion optimization circuit the 5th embodiment of the present invention;
Fig. 7, total harmonic distortion optimization method flow diagram of the present invention.
Embodiment
Elaborate to total harmonic distortion optimization circuit provided by the invention and method below in conjunction with accompanying drawing, wherein identical label represents same or similar assembly.
With reference to Figure 1A, total harmonic distortion optimization circuit one execution mode configuration diagram of the present invention.Total harmonic distortion optimization circuit of the present invention, is applied to Active Power Factor Correction LED drive system, and described LED drive system comprises rectifier bridge 11 and LED drive chip 19; Two inputs of described rectifier bridge 11 are not shown with input civil power AC() be connected, the output of described rectifier bridge 11 is electrically connected to described LED drive chip 19; LED drive chip is High Power Factor, constant current/constant voltage driving chip, is wherein provided with power factor compensation loop 17.Described total harmonic distortion optimization circuit comprises civil power phase acquisition module 12 and total harmonic distortion compensating module 14.Wherein, civil power phase acquisition module 12, total harmonic distortion compensating module 14 and power factor compensation loop 17 form the compensation circuit of power factor correction total harmonic distortion jointly, that helps to improve voltage-to-current waveform by the compensation circuit of power factor correction total harmonic distortion follows degree, thus improve total harmonic distortion, the harmonics level of needs can be adjusted to according to application demand; Below provide detailed explanation.
The input of described civil power phase acquisition module 12 is coupled to described rectifier bridge 11, the phase acquisition of civil power described in present embodiment module 12 comprises two inputs, is electrically connected two inputs (also namely between described civil power phase acquisition module 12 zero line that is connected to input civil power AC and live wire) of described rectifier bridge 11 respectively; The output of described civil power phase acquisition module 12 is electrically connected to the input of described total harmonic distortion compensating module 14; Described civil power phase acquisition module 12 inputs the phase place of civil power AC for Real-time Collection and is sent to described total harmonic distortion compensating module 14.
The output of described total harmonic distortion compensating module 14 is connected with the input in the power factor compensation loop 17 be arranged in LED drive chip 19, for providing described phase information to described power factor compensation loop 17 in real time.Described total harmonic distortion compensating module 14 comprises RC circuit, RC circuit on one side connects civil power phase acquisition module 12, the COMP pin in access power factor compensation loop, one end 17, follow degree by what increase that RC loop from civil power phase acquisition module 12 to COMP pin helps to improve voltage-to-current waveform, thus improve total harmonic distortion.
Described LED drive chip 19 adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.Active Power Factor Correction LED drive chip 19 in Switching Power Supply adopts closed-loop control to carry out the steady operation of keeping system; The closed-loop control in power factor compensation loop 17 is comprised in closed-loop control.Total harmonic distortion compensating module 14 can provide the phase information of input civil power to power factor compensation loop 17 in real time, phase information is made to participate in the closed-loop control in power factor compensation loop 17, for calibrating the difference existed between LED drive system work and civil power input, to eliminate the voltage and current signal of civil power input in the phase angle upper deviation, the voltage and current signal that civil power is inputted keeps coincideing on phase angle, thus reach and can improve the object that power factor can reduce again total harmonic distortion, improve the performance of Active Power Factor Correction LED drive system application.
Preferably, power factor compensation loop 17 is an external building-out capacitor C-COMP further, to increase the nargin of Active Power Factor Correction LED drive system job stability.Described building-out capacitor C-COMP one end is electrically connected with described total harmonic distortion compensating module 14, accesses the COMP pin of described LED drive chip 19 simultaneously, and described building-out capacitor C-COMP other end electrical connection is with reference to ground end.
With reference to Figure 1B, another execution mode configuration diagram of total harmonic distortion optimization circuit of the present invention.Be with Figure 1A illustrated embodiment difference, the phase acquisition of civil power described in present embodiment module 12 comprises an input, and described input is electrically connected to the output of described rectifier bridge 11.
Next multiple embodiments of total harmonic distortion optimization circuit of the present invention are provided by reference to the accompanying drawings, to be described further the operation principle of total harmonic distortion optimization circuit of the present invention.
With reference to figure 2, circuit diagram described in total harmonic distortion optimization circuit first embodiment of the present invention; The present embodiment corresponds to Figure 1A illustrated embodiment.In the present embodiment, described rectifier bridge 11 adopts four diode composition full-bridge rectifiers; Electric capacity Cin is used for carrying out filtering to the direct current after rectifier bridge 11 rectification; Between the zero line that described civil power phase acquisition module 12 is connected to input civil power AC and live wire; Resistance R-VCC and electric capacity C-VCC is used for powering for LED drive chip 19, and the connected mode of the pin of chip own is existing conventional connected mode, repeats no more herein; Wherein load is not shown.
Be specially, described civil power phase acquisition module 12 comprises the first resistance RC1 and the second resistance RC2 of series connection; Described first resistance RC1 one end electricity is connected to an input of described rectifier bridge 11, and the described first resistance RC1 other end is electrically connected electricity simultaneously and is connected to the input of described total harmonic distortion compensating module 14 with one end of described second resistance RC2; The other end electricity of described second resistance RC2 is connected to another input of described rectifier bridge 11.First resistance RC1 of series connection and the second resistance RC2 is used for the phase place of rectifier bridge 11 input described in Real-time Collection, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module 14.
In the present embodiment, described total harmonic distortion compensating module 14 is made up of the resistance R-THD connected and electric capacity C-THD; Described resistance R-THD one end electricity is connected to the output (the first resistance RC1 namely connected and the common port of the second resistance RC2) of described civil power phase acquisition module 12, and the described resistance R-THD other end is electrically connected with one end of described electric capacity C-THD; The other end electricity of described electric capacity C-THD is connected to the input (i.e. the COMP pin of described LED drive chip 19) in described power factor compensation loop 17.The resistance R-THD of series connection and electric capacity C-THD is used for providing described phase information to described power factor compensation loop 17 in real time.That is, follow degree mainly through what increase that RC loop from bus to COMP pin helps to improve voltage-to-current waveform, thus improve total harmonic distortion; The harmonics level of needs can be adjusted to according to application demand.
With reference to figure 3, circuit diagram described in total harmonic distortion optimization circuit second embodiment of the present invention; The present embodiment corresponds to Figure 1B illustrated embodiment.Be with difference embodiment illustrated in fig. 2, described civil power phase acquisition module 12 is electrically connected to the output of described rectifier bridge 11.
Be specially, described civil power phase acquisition module 12 comprises a wire; Described wire electricity is connected to the output of described rectifier bridge 11, and described wire is used for the phase place of rectifier bridge 11 output described in Real-time Collection, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module 14.In other embodiments, described civil power phase acquisition module 12 can for comprising a resistance; Described resistance electricity is connected to the output of described rectifier bridge 11, and described resistance is used for the phase place of rectifier bridge 11 output described in Real-time Collection, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module 14.
With reference to figure 4, circuit diagram described in total harmonic distortion optimization circuit the 3rd embodiment of the present invention; The present embodiment corresponds to Figure 1B illustrated embodiment.Be with difference embodiment illustrated in fig. 3, described total harmonic distortion compensating module 14 comprises pull-up resistor RH-THD, pull down resistor RL-THD and electric capacity C-THD.
Be specially, described pull-up resistor RH-THD one end electricity is connected to the output (other end of the wire be namely connected with rectifier bridge 11) of described civil power phase acquisition module 12, and the described pull-up resistor RH-THD other end is electrically connected electricity simultaneously and is connected to one end of described electric capacity C-THD with one end of described pull down resistor RL-THD; The other end electrical connection of described pull down resistor RL-THD is with reference to ground end; The other end electricity of described electric capacity C-THD is connected to the input (i.e. the COMP pin of described LED drive chip 19) in described power factor compensation loop 17.Pull-up resistor RH-THD, pull down resistor RL-THD and electric capacity C-THD form RC loop jointly for providing described phase information to described power factor compensation loop 17 in real time.
By setting up a pull down resistor RL-THD, the electric capacity C-THD in the present embodiment can adopt lower-cost small capacitances; Also namely, the electric capacity of the electric capacity C-THD in the present embodiment compared to Fig. 3, embodiment illustrated in fig. 2 in electric capacity C-THD can select the low-voltage capacitance of higher price-performance ratio.
With reference to figure 5, circuit diagram described in total harmonic distortion optimization circuit the 4th embodiment of the present invention; The present embodiment corresponds to Figure 1B illustrated embodiment.In the present embodiment, electric capacity C-VCC is used for powering for LED drive chip 19, and the connected mode of the pin of chip own is existing conventional connected mode, repeats no more herein; Wherein load is not shown.
With reference to figure 6, circuit diagram described in total harmonic distortion optimization circuit the 5th embodiment of the present invention; The present embodiment corresponds to Figure 1B illustrated embodiment.In the present embodiment, the connected mode of the pin of LED drive chip 19 own is existing conventional connected mode, repeats no more herein; Wherein part shown in label 60 is load.
Can be found out by above-described embodiment, total harmonic distortion optimization circuit provided by the invention is applicable to multiple active power and corrects LED drive chip, and total harmonic distortion optimization circuit provided by the invention follows degree by what improve voltage-to-current waveform, thus improve total harmonic distortion, and the harmonics level of needs can be adjusted to according to application demand, namely can meet the possibility that total harmonic distortion is optimized further; Realize the THD < 15% meeting active power correcting scheme, even indivedual application require the demand of THD < 10%.
With reference to figure 7, total harmonic distortion optimization method flow diagram of the present invention, described total harmonic distortion optimization method, be applied to Active Power Factor Correction LED drive system, described LED drive system comprises rectifier bridge and LED drive chip, two inputs of described rectifier bridge are connected with input civil power, and the output of described rectifier bridge is electrically connected to described LED drive chip.Described method comprises: S71: Real-time Collection inputs the phase place of civil power and is sent to a total harmonic distortion compensating module; S72: described total harmonic distortion compensating module provides the input in the power factor compensation loop of described phase information to being arranged in LED drive chip in real time; S73: described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion; Below provide detailed explanation.
S71: Real-time Collection inputs the phase place of civil power and is sent to a total harmonic distortion compensating module.
In this step, the phase place of rectifier bridge input described in the two input Real-time Collections that the first resistance of series connection and the second resistance can be adopted to be coupled to described rectifier bridge, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.Described in the composition of the civil power phase acquisition module 12 as shown in Figure 2 in embodiment and working method.
In this step, also can adopt the phase place of rectification bridge output end described in the electric output Real-time Collection being connected to described rectifier bridge of wire, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.Described in the composition of the civil power phase acquisition module 12 as shown in Figure 3, Figure 4 in embodiment and working method.Also the phase place of rectification bridge output end described in the electric output Real-time Collection being connected to described rectifier bridge of resistance can be adopted, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module; Adopt the connected mode of resistance and working method can with reference to the composition of the civil power phase acquisition module 12 in embodiment as shown in Figure 3, Figure 4 and described.
S72: described total harmonic distortion compensating module provides the input in the power factor compensation loop of described phase information to being arranged in LED drive chip in real time.
Described total harmonic distortion compensating module can for be made up of the resistance of connecting and electric capacity; Described resistance one end electricity is connected to the output of described civil power phase acquisition module, and the described resistance other end is electrically connected with one end of described electric capacity; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.Described in the composition of the total harmonic distortion compensating module 14 as shown in Figure 2 and Figure 3 in embodiment and working method.
Described total harmonic distortion compensating module also can for comprising pull-up resistor, pull down resistor and electric capacity; Described pull-up resistor one end electricity is connected to the output of described civil power phase acquisition module, and the described pull-up resistor other end is electrically connected electricity simultaneously and is connected to one end of described electric capacity with one end of described pull down resistor; The other end electrical connection of described pull down resistor is with reference to ground end; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.Described in the composition of the total harmonic distortion compensating module 14 as shown in Figure 4 in embodiment and working method.
S73: described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.
Described LED drive chip adopts closed-loop control to carry out the steady operation of keeping system, comprises the closed-loop control in power factor compensation loop in closed-loop control; According to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.Total harmonic distortion compensating module can provide the phase information of input civil power to power factor compensation loop in real time, phase information is made to participate in the closed-loop control in power factor compensation loop, for calibrating the difference existed between LED drive system work and civil power input, the voltage and current signal that civil power is inputted keeps coincideing on phase angle, thus reach and can improve the object that power factor can reduce again total harmonic distortion, improve the performance of Active Power Factor Correction LED drive system application.
Preferably, power factor compensation loop is an external building-out capacitor further, to increase the nargin of Active Power Factor Correction LED drive system job stability.Described building-out capacitor one end is electrically connected with described total harmonic distortion compensating module, accesses the COMP pin of described LED drive chip simultaneously, and described building-out capacitor other end electrical connection is with reference to ground end.
The above is only the preferred embodiment of the present invention, only in order to technical scheme of the present invention to be described but not limitation of the present invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a total harmonic distortion optimization circuit, be applied to Active Power Factor Correction LED drive system, described LED drive system comprises rectifier bridge and LED drive chip, two inputs of described rectifier bridge are connected with input civil power, the output of described rectifier bridge is electrically connected to described LED drive chip, it is characterized in that, described circuit comprises: civil power phase acquisition module and total harmonic distortion compensating module;
The input of described civil power phase acquisition module is coupled to described rectifier bridge, the output of described civil power phase acquisition module is electrically connected to the input of described total harmonic distortion compensating module, and described civil power phase acquisition module is used for the phase place of Real-time Collection input civil power and is sent to described total harmonic distortion compensating module;
The output of described total harmonic distortion compensating module is connected with the input in the power factor compensation loop be arranged in LED drive chip, for providing described phase information to described power factor compensation loop in real time;
Described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.
2. circuit according to claim 1, is characterized in that, described civil power phase acquisition module comprises the first resistance and second resistance of series connection; Described first resistance one end electricity is connected to an input of described rectifier bridge, and the described first resistance other end is electrically connected electricity simultaneously and is connected to the input of described total harmonic distortion compensating module with one end of described second resistance; The other end electricity of described second resistance is connected to another input of described rectifier bridge; First resistance of described series connection and the second resistance are used for the phase place of rectifier bridge input described in Real-time Collection, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.
3. circuit according to claim 1, is characterized in that, described civil power phase acquisition module comprises a wire or a resistance; Described wire or resistance electricity are connected to the output of described rectifier bridge, and described wire or resistance are used for the phase place of rectification bridge output end described in Real-time Collection, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.
4. circuit according to claim 1, is characterized in that, described total harmonic distortion compensating module is made up of the resistance of connecting and electric capacity; Described resistance one end electricity is connected to the output of described civil power phase acquisition module, and the described resistance other end is electrically connected with one end of described electric capacity; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.
5. circuit according to claim 1, is characterized in that, described total harmonic distortion compensating module comprises pull-up resistor, pull down resistor and electric capacity; Described pull-up resistor one end electricity is connected to the output of described civil power phase acquisition module, and the described pull-up resistor other end is electrically connected electricity simultaneously and is connected to one end of described electric capacity with one end of described pull down resistor; The other end electrical connection of described pull down resistor is with reference to ground end; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.
6. circuit according to claim 1, it is characterized in that, described power factor compensation loop is an external building-out capacitor further, described building-out capacitor one end is electrically connected with described total harmonic distortion compensating module, access the COMP pin of described LED drive chip, described building-out capacitor other end electrical connection is with reference to ground end simultaneously.
7. a total harmonic distortion optimization method, be applied to Active Power Factor Correction LED drive system, described LED drive system comprises rectifier bridge and LED drive chip, two inputs of described rectifier bridge are connected with input civil power, the output of described rectifier bridge is electrically connected to described LED drive chip, it is characterized in that, comprising:
(1) Real-time Collection inputs the phase place of civil power and is sent to a total harmonic distortion compensating module;
(2) described total harmonic distortion compensating module provides the input in the power factor compensation loop of described phase information to being arranged in LED drive chip in real time;
(3) described LED drive chip adopts closed-loop control, according to the difference existed between described phase information calibration LED drive system work and civil power input, to optimize total harmonic distortion.
8. method according to claim 7, it is characterized in that, step (1) comprises further: the phase place of rectifier bridge input described in the two input Real-time Collections adopting the first resistance of series connection and the second resistance to be coupled to described rectifier bridge, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.
9. method according to claim 7, it is characterized in that, step (1) comprises further: the phase place adopting rectification bridge output end described in wire or the electric output Real-time Collection being connected to described rectifier bridge of resistance, to obtain the phase place of input civil power and to be sent to described total harmonic distortion compensating module.
10. method according to claim 7, is characterized in that, described total harmonic distortion compensating module is made up of the resistance of connecting and electric capacity; Described resistance one end electricity is connected to the output of described civil power phase acquisition module, and the described resistance other end is electrically connected with one end of described electric capacity; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.
11. methods according to claim 7, is characterized in that, described total harmonic distortion compensating module comprises pull-up resistor, pull down resistor and electric capacity; Described pull-up resistor one end electricity is connected to the output of described civil power phase acquisition module, and the described pull-up resistor other end is electrically connected electricity simultaneously and is connected to one end of described electric capacity with one end of described pull down resistor; The other end electrical connection of described pull down resistor is with reference to ground end; The other end electricity of described electric capacity is connected to the input in described power factor compensation loop.
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| CN201510667366.9A CN105207465A (en) | 2015-10-16 | 2015-10-16 | Total harmonic distortion optimizing circuit and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110298390A1 (en) * | 2010-06-08 | 2011-12-08 | Immense Advance Technology Corp., | Power conversion controller having an adaptive peak current reference |
| CN104242693A (en) * | 2014-10-10 | 2014-12-24 | 无锡优为照明科技有限公司 | Compensating circuit capable of reducing current harmonic distortion of switching power supply |
| CN205004948U (en) * | 2015-10-16 | 2016-01-27 | 上海晶丰明源半导体有限公司 | Total harmonic distortion optimizes circuit |
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2015
- 2015-10-16 CN CN201510667366.9A patent/CN105207465A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110298390A1 (en) * | 2010-06-08 | 2011-12-08 | Immense Advance Technology Corp., | Power conversion controller having an adaptive peak current reference |
| CN104242693A (en) * | 2014-10-10 | 2014-12-24 | 无锡优为照明科技有限公司 | Compensating circuit capable of reducing current harmonic distortion of switching power supply |
| CN205004948U (en) * | 2015-10-16 | 2016-01-27 | 上海晶丰明源半导体有限公司 | Total harmonic distortion optimizes circuit |
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Application publication date: 20151230 |