CN101924458A - Switch power supply and prevention method thereof - Google Patents
Switch power supply and prevention method thereof Download PDFInfo
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- CN101924458A CN101924458A CN 201010244547 CN201010244547A CN101924458A CN 101924458 A CN101924458 A CN 101924458A CN 201010244547 CN201010244547 CN 201010244547 CN 201010244547 A CN201010244547 A CN 201010244547A CN 101924458 A CN101924458 A CN 101924458A
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Abstract
The invention discloses a switch power supply and a prevention method thereof, belonging to the technical field of electronics. The switch power supply comprises a resonance module and a voltage conversion module, wherein the operating frequency range of the resonance module and the operating frequency range of the voltage conversion module have intersection; the output end of the resonance module and the input end of the voltage conversion module are coupled; the resonance module is used for adsorbing the energy of continuous overvoltage pulse so as to reduce energy loaded by the voltage conversion module when the switch power supply receives continuous overvoltage pulse and the repetition frequency of the continuous overvoltage pulse is within the intersection. The method comprises: when the switch power supply receives continuous overvoltage pulse and the repetition frequency of the continuous overvoltage pulse is within the intersection, the resonance module adsorbs the energy of continuous overvoltage pulse so as to reduce energy loaded by the voltage conversion module. The invention realizes the protection to the continuous overvoltage pulse by the switch power supply and improves the prevention capability of the switch power supply.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of Switching Power Supply and Switching Power Supply means of defence.
Background technology
The Switching Power Supply high frequencyization is the direction of its development, and high frequencyization makes the Switching Power Supply miniaturization, and makes Switching Power Supply enter application widely, particularly in the application of high-technology field, has promoted miniaturization, the lighting of new high-tech product.In addition the development of Switching Power Supply be applied in energy savings, economize on resources and protect the environment aspect all to have great importance.Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch transistor turns on and off is kept a kind of power supply of regulated output voltage.
But in the use of Switching Power Supply, when when distribution system coupled interference or distribution system break down, the power input mouth can be subjected to overvoltage and impact.In order to allow the equipment in these cases can operate as normal, prior art be to utilize the characteristic of the circuit devcie in the Switching Power Supply itself anti-interference firmly.For example, use can tolerate diode, electric capacity, pulse-width modulator and transformer of high pressure or the like in Switching Power Supply.
After prior art is analyzed, the inventor finds that prior art has following shortcoming at least: for single overvoltage pulse, main concentration of energy is below 10kHz, and the working frequency range of the transformer in the Switching Power Supply is generally more than the 50kHz, at this moment, the energy of single overvoltage pulse can't be delivered to secondary by transformer.If single overvoltage pulse occurred repeatedly in a period of time, then constitute continuous overvoltage pulse, wherein, the number of times that single overvoltage pulse occurred in the unit interval is the repetition rate of continuous overvoltage pulse.For continuous overvoltage pulse, if its repetition rate in the working frequency range of transformer, then most energy of continuous overvoltage pulse can be delivered to the secondary of transformer.Therefore, the circuit devcie of existing Switching Power Supply itself has stronger protective capacities to single overvoltage pulse, but continuous overvoltage pulse is then lost protective capacities, and most of energy delivery of continuous overvoltage pulse probably causes late-class circuit to damage behind transformer secondary.
Summary of the invention
In order to improve the protective capacities of Switching Power Supply, the embodiment of the invention provides a kind of Switching Power Supply and Switching Power Supply means of defence.Described technical scheme is as follows:
A kind of Switching Power Supply comprises: resonance modules and voltage transformation module;
The operating frequency range of described resonance modules and the operating frequency range of described voltage transformation module have common factor;
Described resonance modules output and the coupling of described voltage transformation module input, described resonance modules is used for receiving continuous overvoltage pulse when Switching Power Supply, and the repetition rate of described continuous overvoltage pulse is within described common factor the time, absorb the energy of described continuous overvoltage pulse, to reduce the energy that described voltage transformation module is born.
A kind of method of utilizing described Switching Power Supply to protect, described method comprises:
When described Switching Power Supply receives continuous overvoltage pulse, and the repetition rate of described continuous overvoltage pulse is within described common factor the time, and described resonance modules absorbs the energy of described continuous overvoltage pulse, to reduce the energy that described voltage transformation module is born.
The beneficial effect of the technique scheme that the embodiment of the invention provides is: realized the protection of Switching Power Supply to continuous overvoltage pulse, greatly improved the self-protection ability of Switching Power Supply, promote the product degree of protection, avoided the late-class circuit in the Switching Power Supply to be damaged.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the Switching Power Supply structural representation that the embodiment of the invention 1 provides;
Fig. 2 is a kind of circuit diagram of Switching Power Supply that the embodiment of the invention 1 provides;
Fig. 3 is the another kind of circuit diagram of Switching Power Supply that the embodiment of the invention 1 provides.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 1, present embodiment provides a kind of Switching Power Supply, comprise: resonance modules 101 and voltage transformation module 102, the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 has common factor, resonance modules 101 outputs and the coupling of voltage transformation module 102 inputs, resonance modules 101 is used for receiving continuous overvoltage pulse when Switching Power Supply, and the repetition rate of this continuous overvoltage pulse is within above-mentioned common factor the time, absorb the energy of this continuous overvoltage pulse, to reduce the energy that voltage transformation module 102 is born.
In the present embodiment, resonance modules 101 can comprise inductance, electric capacity and resistance.In this case, can be by the value of choosing resistance so that the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 has common factor.
The operating frequency range that present embodiment relates to usually represents that with two boundary values up and down upper boundary values is represented the maximum frequency values in the operating frequency range, and lower border value is represented the minimum frequency value that operating frequency range is interior.The central point of the operating frequency range of resonance modules 101 is a resonance frequency, and the central point of the operating frequency range of voltage transformation module 102 is the work centre frequency.For example, the operating frequency range of resonance modules 101 is 60KHz～80KHz, and then upper boundary values is 80KHz, and lower border value is 60KHz, and resonance frequency is 70KHz; The operating frequency range of voltage transformation module 102 is 70KHz～90KHz, and then upper boundary values is 90KHz, and lower border value is 70KHz, and the work centre frequency is 80KHz; At this moment, the common factor of the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 is 70KHz～80KHz.
In the present embodiment, the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 has common factor to comprise: partially overlap or coincidence fully.Two boundary values up and down with the operating frequency range of voltage transformation module 102 are identical respectively to refer to two boundary values up and down of operating frequency range of resonance modules 101 under the coincidence situation fully.For example, two operating frequency ranges are 60KHz～80KHz.Can comprise a plurality of frequency values in this common factor under the situation that partially overlaps, also can include only a frequency values, operating frequency range as resonance modules 101 is 60KHz～80KHz, if the operating frequency range of voltage transformation module 102 is 80KHz～90KHz, include only a frequency values 80KHz in then occuring simultaneously, if the operating frequency range of voltage transformation module 102 is 70KHz～90KHz, then occuring simultaneously is 70KHz～80KHz, promptly comprises all frequency values in 70KHz～80KHz.
In the present embodiment, when the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 had common factor, the resonance frequency of resonance modules 101 can equate with the work centre frequency of voltage transformation module 102, also can be unequal.Under the optimal way, the resonance frequency of resonance modules 101 equates with the work centre frequency of voltage transformation module 102.In this case, when Switching Power Supply receives continuous overvoltage pulse, and when the repetition rate of this continuous overvoltage pulse equates with the work centre frequency of voltage transformation module 102, this repetition rate also equates with the resonant frequency of operation of resonance modules 101, at this moment, resonance modules 101 can produce resonance, absorbs the energy of this continuous overvoltage pulse, thereby reduces the energy that voltage transformation module 102 is born.Correspondingly, resonance modules 101 can comprise: inductance and electric capacity, the value by choosing inductance and electric capacity can so that the resonance frequency of resonance modules 101 equate with the work centre frequency of voltage transformation module 102.
Further, in the present embodiment, when the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 had common factor, the passband of the passband of resonance modules 101 and voltage transformation module 102 can equate, also can be unequal.Under the optimal way, the passband of the passband of resonance modules 101 and voltage transformation module 102 equates.Under best mode, the resonance frequency of resonance modules 101 equates with the work centre frequency of voltage transformation module 102, and the passband of the passband of resonance modules 101 and voltage transformation module 102 also equates, at this moment, the operating frequency range of the operating frequency range of resonance modules 101 and voltage transformation module 102 overlaps fully, in this case, resonance modules 101 can farthest absorb the energy of continuous overvoltage pulse, thereby the energy minimum that voltage transformation module 102 is born has greatly improved the protective capacities of Switching Power Supply.
The passband that relates in the present embodiment is meant under the 3dB pad value, the frequency range that circuit can pass through, i.e. operating frequency range.Amplitude just is called passband in the 3dB of peak signal component amplitude (promptly 0.707) decay with interior frequency range in all signal components.
For example, if the 3dB of peak signal component amplitude point is respectively 50KHz and 70KHz, then passband is 20KHz.
In the present embodiment, resonance modules 101 can be positioned at the diverse location of Switching Power Supply.First kind of mode, the input of resonance modules 101 is connected in parallel on the power input of Switching Power Supply, and the output of resonance modules 101 also is parallel with rectification circuit, the input of voltage transformation module 102 and the coupling of the output of filter circuit.Under first kind of mode, the input signal of resonance modules 101 is the signal that Switching Power Supply receives, the output signal of resonance modules 101 behind over commutation as the input signal of voltage transformation module 102.The second way, the power input of Switching Power Supply also is parallel with rectification circuit, and the input of resonance modules 101 is connected in parallel on the output of this rectification circuit, and the output of resonance modules 101 is connected in parallel on the input of voltage transformation module 102.Under the second way, the input signal of resonance modules 101 carries out the signal that obtains after the rectification for the signal that Switching Power Supply is received, and the output signal of resonance modules 101 is the input signal of voltage transformation module 102.
Under the above-mentioned dual mode, resonance modules 101 comprises at least: inductance and electric capacity can certainly comprise inductance, electric capacity and resistance.Wherein, under above-mentioned first kind of mode, can increase inductance and electric capacity newly in Switching Power Supply, perhaps newly-increased inductance, electric capacity and resistance are formed resonance modules 101.Under the above-mentioned second way, can use the existing filter capacitor that is connected in parallel on the bridge rectifier output in the Switching Power Supply, and newly-increased inductance, perhaps newly-increased inductance and resistance are formed resonance modules 101.Because existing electric capacity has filter function in the Switching Power Supply, therefore under the second way, resonance modules 101 also has the function of filtering.In using Switching Power Supply, during existing electric capacity, can save the cost of Switching Power Supply.
Under any execution mode in the present embodiment, the inductance in the resonance modules 101 is preferably air core inductor, can avoid overcurrent saturated.Under the preferred mode, this inductance is the less inductance of capacity, can avoid overcurrent saturated, particularly, can be the inductance of capacity less than designated value, is capacity less than inductance of 1 μ H or the like as this inductance, and this designated value can be changed as required.Certainly in the embodiment of the invention, also can adopt the inductance of other type, the capacity of inductance also can be selected as required, and the embodiment of the invention is not done concrete qualification to this.
Voltage transformation module 102 in the present embodiment is used to receive the signal of resonance modules 101 outputs, and exports through the output signal as Switching Power Supply after the voltage transitions.Voltage transformation module 102 can specifically comprise: transformer.
Rectification circuit in the present embodiment specifically adopts bridge rectifier, but as is known to the person skilled in the art, also can adopt other rectification circuit, and the present invention does not limit this.
The function of the rectification of Switching Power Supply, filtering and voltage transitions is the function that existing Switching Power Supply just has in the present embodiment, therefore, does not do too much explanation in the present embodiment.
The circuit of the resonance modules 101 in the present embodiment is realized having multiple, illustrates with two kinds of concrete circuit below, can certainly adopt other circuit form to realize, the embodiment of the invention is not done concrete qualification to this.
Referring to Fig. 2, a kind of circuit diagram of the Switching Power Supply that provides for present embodiment.Wherein, resonance modules 101 is made up of newly-increased inductance L 1, capacitor C 1 and resistance R 1, and is connected in parallel on the input of Switching Power Supply.Diode D1, D2, D3 and D4 form rectification circuit, are used for the output signal of resonance modules 101 is carried out rectification.Capacitor C is a filter circuit, is used for the signal after this rectification is carried out filtering.Voltage transformation module 102 is specially transformer T, is used for this filtered signal is carried out voltage transitions, and the signal after this conversion is as the output signal output of Switching Power Supply.Other device among the figure except that the above-mentioned device of mentioning is used for the voltage after the transformer conversion is carried out voltage stabilizing and rectification, comprises a plurality of devices, and as diode D5 and D6, pulse-width modulator Q or the like does not give unnecessary details herein.
In circuit shown in Figure 2, preferably, inductance L 1 is an air core inductor, and capacity can avoid overcurrent saturated less than 1 μ H.Capacitor C 1 can be according to the resonance frequency f of resonance modules 101
1Work centre frequency f with transformer T
0The principle that equates is chosen, particularly, and can be according to resonance frequency f
1Computing formula and the work centre frequency f of transformer T
0Calculate the value of C1, form resonance modules 101 thereby choose capacitor C 1 according to this value.Wherein, resonance frequency f
1Computing formula as follows:
Because f
1=f
0, and, the work centre frequency f of transformer T
0Be known parameter, then f
1Also be known, therefore, can be with f
1Value and the inductance L 1 value substitution formula of having chosen (1), thereby obtain the value of capacitor C 1.In addition, preferably, withstand voltage, the flow-resistant capacity of C1 should arrive the level of C at least, preferably is higher than withstand voltage, the flow-resistant capacity of C, to improve the protective capacities of Switching Power Supply.
Resistance R 1 in the resonance modules 101, its value can have the principle of common factor to choose according to the operating frequency range of resonance modules 101 and the operating frequency range of transformer T.Preferably, can be according to the passband Δ f of resonance modules 101
1Equal the passband Δ f of transformer T
0Principle choose, the passband computing formula of resonance modules 101 is as follows:
Wherein, Q1 is the quality factor of resonance modules 101, ω
0Be the angular frequency of resonance modules 101, and
Because the passband Δ f of transformer T
0Be known, and Δ f
1=Δ f
0, therefore, under L1 and the fixed situation of C1, utilize above-mentioned formula (2) can calculate the value of R1, choose resistance R 1 and fixed inductance L 1 and the capacitor C 1 common resonance modules 101 of forming according to this value.In addition, can also choose resistance R 1 according to the performance number of appointment, as choose power resistance above 1/4 watt or the like, damage to avoid long-time overcurrent, the performance number of appointment can be changed as required, and the embodiment of the invention is not done concrete qualification to this.
When Switching Power Supply shown in Figure 2 when input receives continuous overvoltage pulse, if the voltage of this continuous overvoltage pulse is V, repetition rate f=f
0Then the resonance modules 101 of L1, C1 and R1 composition produces resonance, because resonance modules 101 has filtering characteristic, therefore, can absorb the energy of continuous overvoltage pulse, behind rectification circuit that the signal of resonance modules 101 output is formed through D1, D2, D3 and D4 and the filter circuit is made up of C, the elementary overvoltage of arrival transformer T is V
1, the overvoltage that arrives transformer secondary output through transformer voltage conversion back is V
2, the no-load voltage ratio of known transformer T is N: 1, and then the relation of V, V1 and V2 is as follows:
V
1＝V×R1/(R1+r)； (3)
V
2＝V
1/N； (4)
Wherein, r is the output impedance of Switching Power Supply, and unit is ohm.Can obtain by above-mentioned formula (3) and (4):
V
2＝V×R1/(R1+r)/N； (5)
For the Switching Power Supply that does not have resonance modules, transformer-secondary voltage V
2=V/N, and have the Switching Power Supply of resonance modules, transformer-secondary voltage V
2=[R1/ (R1+r)] * V/N, because R1/ (R1+r)＜1, therefore, increased that transformer-secondary voltage can reduce in the Switching Power Supply behind the resonance modules, resonance modules has absorbed the energy of a part of continuous overvoltage pulse, thereby has reduced the impact that transformer secondary output bore, and has suppressed the interference of continuous overvoltage pulse, play protective action, improved the protective capacities of Switching Power Supply.
For example, the work centre frequency of transformer is f
0=50kHz, passband is Δ f
0=10kHz, no-load voltage ratio is 40: 1, and the continuous overvoltage pulse that the Switching Power Supply input receives is V=2kV, and the output impedance of Switching Power Supply is r=2 Ω.Choose the air core inductor of L1=1 μ H, C1=6.8 μ F and voltage endurance capability are the electric capacity of 470V, form resonance modules by L1 and C1, its resonance frequency f
1Be about 50kHz.Choose the resistance that R1=0.05 ohm and power surpass 1/4 watt, make the passband Δ f of resonance modules
1Be about 9.7kHz.At this moment, the elementary overvoltage of transformer is V
1=2kV * 0.05/2.05=49V, the secondary overvoltage of transformer is V
2=49V/40=1.2V.Usually, the output impedance of Switching Power Supply is far longer than 2 ohm, and therefore, when not increasing resonance modules, switch power source output voltage far surpasses 50V.This shows that the Switching Power Supply behind the increase resonance modules can greatly reduce transformer-secondary voltage, has improved the protective capacities of Switching Power Supply.
Referring to Fig. 3, the another kind of circuit diagram of the Switching Power Supply that provides for present embodiment.Resonance modules 101 is made up of original capacitor C series connection newly-increased inductance L 0 and newly-increased resistance R 0 in the switching power circuit.Diode D1, D2, D3 and D4 form rectification circuit, and the signal that is used for Switching Power Supply is received carries out rectification, exports to resonance modules 101 then.Transformer T is used for the signal of resonance modules 101 outputs is carried out voltage transitions, and the signal after this conversion is as the output signal output of Switching Power Supply.Other device among the figure except that the above-mentioned device of mentioning is used for the voltage after the transformer conversion is carried out voltage stabilizing and rectification, comprises a plurality of devices, and as diode D5 and D6, pulse-width modulator Q or the like does not give unnecessary details herein.
In circuit shown in Figure 3, the electric capacity in the resonance modules 101 is existing electric capacity in the Switching Power Supply, therefore, need not to choose new electric capacity.Preferably, inductance L 0 can be according to the frequency f of resonance modules 101
1Work centre frequency f with transformer T
0The principle that equates is chosen, particularly, and can be according to resonance frequency f
1Computing formula and the work centre frequency f of transformer T
0Calculate the value of L0, form resonance modules 101 thereby choose inductance L 0 according to this value.Wherein, resonance frequency f
1Computing formula as follows:
Because f
1=f
0, and, the work centre frequency f of transformer T
0Be known parameter, then f
1Also be known, therefore, can be with f
1Value and the value substitution formula (6) of original capacitor C, thereby obtain the value of inductance L 0.In addition, preferably, inductance L 0 is an air core inductor, and capacity can avoid overcurrent saturated less than 1 μ H.
In circuit shown in Figure 3, the resistance R 0 in the resonance modules 101 choose with Fig. 2 in the selection principle of R1 similar, difference only is the R1 in the formula (2) is replaced with R0, L1 replaces with L0, thereby draws the value of R0.Repeat no more herein.
In Fig. 2 and two embodiments of Fig. 3, resonance modules 101 includes resistance.Certainly, also can not comprise resistance in other embodiments of the invention, as long as the operating frequency range of resonance modules 101 and the operating frequency range of voltage transformation module 102 have common factor.When comprising resistance, can control two operating frequency ranges more accurately, as overlapping fully.The embodiment of the invention is not done concrete qualification to this.
The Switching Power Supply that present embodiment provides, by increasing the energy that resonance modules absorbs continuous overvoltage pulse, realized the protection of Switching Power Supply to continuous overvoltage pulse, improved the self-protection ability of Switching Power Supply, promote the degree of protection of product, avoided the late-class circuit in the Switching Power Supply to be damaged.When existing electric capacity is formed resonance modules in adopting Switching Power Supply, can be implemented in cheaply under the situation, improve the degree of protection of product.
The method that the Switching Power Supply that present embodiment provides to be provided among a kind of embodiment of utilization 1 is protected comprises:
When Switching Power Supply receives continuous overvoltage pulse, and the repetition rate of this continuous overvoltage pulse is within above-mentioned common factor the time, and resonance modules absorbs the energy of this continuous overvoltage pulse, to reduce the energy that voltage transformation module is born.
In the present embodiment, the resonance frequency of resonance modules can equate with the work centre frequency of voltage transformation module; Correspondingly, said method specifically comprises:
When Switching Power Supply receives continuous overvoltage pulse, and the repetition rate of this continuous overvoltage pulse is when equating with the work centre frequency of voltage transformation module, and resonance modules absorbs the energy of this continuous overvoltage pulse, to reduce the energy that voltage transformation module is born.
The Switching Power Supply means of defence that present embodiment provides has been realized the protection to continuous overvoltage pulse, has improved the self-protection ability of Switching Power Supply, has promoted the product degree of protection, has avoided the late-class circuit in the Switching Power Supply to be damaged.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a Switching Power Supply is characterized in that, comprising: resonance modules and voltage transformation module;
The operating frequency range of described resonance modules and the operating frequency range of described voltage transformation module have common factor;
The output of described resonance modules and the coupling of the input of described voltage transformation module, and described resonance modules is used for receiving continuous overvoltage pulse when Switching Power Supply, and the repetition rate of described continuous overvoltage pulse is within described common factor the time, absorb the energy of described continuous overvoltage pulse, to reduce the energy that described voltage transformation module is born.
2. Switching Power Supply according to claim 1 is characterized in that, described resonance modules comprises: inductance, electric capacity and resistance.
3. Switching Power Supply according to claim 1 is characterized in that, the resonance frequency of described resonance modules equates with the work centre frequency of described voltage transformation module.
4. Switching Power Supply according to claim 3 is characterized in that, described resonance modules comprises: inductance and electric capacity.
5. according to claim 1 or 3 described Switching Power Supplies, it is characterized in that the passband of described resonance modules equates with the passband of described voltage transformation module.
6. Switching Power Supply according to claim 1, it is characterized in that, the input of described resonance modules is connected in parallel on the power input of described Switching Power Supply, and the output of described resonance modules also is parallel with rectification circuit, the input of described voltage transformation module and the coupling of the output of described rectification circuit.
7. Switching Power Supply according to claim 6 is characterized in that described resonance modules comprises inductance and electric capacity at least, and described electric capacity is newly-increased electric capacity.
8. Switching Power Supply according to claim 1, it is characterized in that, the power input of described Switching Power Supply also is parallel with rectification circuit, and the input of described resonance modules is connected in parallel on the output of described rectification circuit, and the output of described resonance modules is connected in parallel on the input of described voltage transformation module.
9. Switching Power Supply according to claim 8 is characterized in that described resonance modules comprises inductance and electric capacity at least, and described electric capacity is the existing filter capacitor that is connected in parallel on the output of described bridge rectifier in the described Switching Power Supply.
10. method of utilizing the described Switching Power Supply of claim 1 to protect is characterized in that described method comprises:
When described Switching Power Supply receives continuous overvoltage pulse, and the repetition rate of described continuous overvoltage pulse is within described common factor the time, and described resonance modules absorbs the energy of described continuous overvoltage pulse, to reduce the energy that described voltage transformation module is born.
11. method according to claim 10 is characterized in that, the resonance frequency of described resonance modules equates with the work centre frequency of described voltage transformation module;
Described method specifically comprises:
When described Switching Power Supply receives continuous overvoltage pulse, and when the repetition rate of described continuous overvoltage pulse equates with the work centre frequency of described voltage transformation module, described resonance modules absorbs the energy of described continuous overvoltage pulse, to reduce the energy that described voltage transformation module is born.
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| US20060226710A1 (en) * | 2005-04-01 | 2006-10-12 | Denso Corporation | Device for controlling controlled variable by on/off switching operations with less noise manner |
| CN101127484A (en) * | 2007-05-23 | 2008-02-20 | 中国科学院电工研究所 | A digital high voltage DC power |
| CN101640484A (en) * | 2009-08-31 | 2010-02-03 | 华南农业大学 | Switch power supply based on piezoelectric ceramics transformer |
| US20100164400A1 (en) * | 2008-12-31 | 2010-07-01 | Stmicroelectronics S.R. L. | Switching power supply system for optical sources or a load requiring a controlled supply current |
| CN101771351A (en) * | 2009-01-07 | 2010-07-07 | 力博特公司 | Three-phase tri-level LLC resonant converter |
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2010
- 2010-08-02 CN CN201010244547A patent/CN101924458B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060226710A1 (en) * | 2005-04-01 | 2006-10-12 | Denso Corporation | Device for controlling controlled variable by on/off switching operations with less noise manner |
| CN101127484A (en) * | 2007-05-23 | 2008-02-20 | 中国科学院电工研究所 | A digital high voltage DC power |
| US20100164400A1 (en) * | 2008-12-31 | 2010-07-01 | Stmicroelectronics S.R. L. | Switching power supply system for optical sources or a load requiring a controlled supply current |
| CN101771351A (en) * | 2009-01-07 | 2010-07-07 | 力博特公司 | Three-phase tri-level LLC resonant converter |
| CN101640484A (en) * | 2009-08-31 | 2010-02-03 | 华南农业大学 | Switch power supply based on piezoelectric ceramics transformer |
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Address after: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee after: Huawei terminal (Shenzhen) Co.,Ltd. Address before: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee before: HUAWEI DEVICE Co.,Ltd. |
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Effective date of registration: 20181219 Address after: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: HUAWEI DEVICE Co.,Ltd. Address before: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee before: Huawei terminal (Shenzhen) Co.,Ltd. |