CN1338811A - Resonance-type switched power supply with zero-voltage and zero-current switching - Google Patents
Resonance-type switched power supply with zero-voltage and zero-current switching Download PDFInfo
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- CN1338811A CN1338811A CN00121243A CN00121243A CN1338811A CN 1338811 A CN1338811 A CN 1338811A CN 00121243 A CN00121243 A CN 00121243A CN 00121243 A CN00121243 A CN 00121243A CN 1338811 A CN1338811 A CN 1338811A
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- 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
A resonance-type switched power supply with zero-current and zero-voltage switching and working under sine wave is composed of a switching circuit module consisting of 2 or 4 switching circuits and switch driving voltage generator, a resonantor, a transformer, and a feedback controller connected between load and switch driving voltage generator. When switching circuit is switched, its cross voltage varies slowly due to the charge or discharge of paracitic capacitance. The square drive wave from switch driving voltage generator can make the phase of drive voltage pior to the resonant current in resonantor. The square control wave is synchronous with the square drive wave.
Description
The present invention relates to the resonance-type switched power supply device that a kind of no-voltage and zero current switch, particularly the resonance-type switched power supply device that " no-voltage and zero current " switches (no matter Tum-on or Tum-off all are no-voltage and zero current condition) simultaneously can be under sine wave, worked and reach, therefore the no electromagnetic radiation high efficiency effect of tool again can be reached about a kind of; Moreover power supply unit of the present invention has, and part is cheap, cost is low, do not need numerous and diverse adjustment program, is not subjected to parasitic capacitance and leakage inductance to influence, can produce in a large number, can produce the different advantages such as machine of high or low power easily.
Oneself develops the resonance-type switched power supply device for many years, but needs various shortcoming such as numerous and diverse adjustment program, part characteristic dependency degree height because of it, makes to produce economically again in a large number.
Known resonance-type switched power supply device can be divided into generally:
1. it is sinusoidal wave to utilize inductance and capacitor resonance to produce, utilize sinusoidal wave zero intersection to do no-voltage or zero current switching again, this technology can be divided into serial connection load type resonance (SLR) (as shown in Figure 1) and modes such as shunt load formula resonance (PLR) (as shown in Figure 2) and Class-E transducer approximately.The sine wave that both all utilize inductance capacitance resonance to produce makes no-voltage or zero current switches, in this kind circuit, when frequency of input voltage is identical with resonance point, the output maximum of system, if load at this moment keeps definite value, then export energy and also can keep definite value, but this ideal state can not usually exist.
2. quasi-resonance or phase-shift type PWM promptly utilize the leakage inductance of transistorized parasitic capacitance and power transformer to do no-voltage or zero current switching, but both all have its special difficulty.
Existing easily produce have full-bridge phase-shift Zero voltage transition device (Full-Bidge ZVS PWMConverter) only, but it uses four groups of switches, the circuit complexity, many and parasitic capacitance of part and leakage inductance are grasped and are difficult for, adjust difficulty, if it is also uneconomical to make the small-power transducer, thus can't low-costly again in a large number make, and when underloading, usually can't keep no-voltage or zero current to switch.In other words, no matter known resonance-type switched power supply device does not still have to reach the effect that control switch closed circuit (Turn-on) or control switch open circuit (Turn-off) all are " no-voltage and zero current " state and also can do " no-voltage and zero current switch " when underloading.
This shows that above-mentioned known article still have many defectives, real non-one good design, and demand urgently being improved.In view of above-mentioned, purpose of the present invention promptly is to provide the resonance-type switched power supply device of a kind of no-voltage and zero current switching, it is to be the circuit that purpose designs at above-mentioned shortcoming and with a large amount of productions, can full-bridge or half-bridge work, and also comparatively economical when making the small-power transducer.
An of the present invention purpose is to provide the resonance-type switched power supply device of a kind of no-voltage and zero current switching, and it has " no-voltage and zero current " switching characteristic, to reach the high efficiency effect of no electromagnetic radiation and tool.
Another object of the present invention is to provide the resonance-type switched power supply device of a kind of no-voltage and zero current switching, it has, and part is cheap, cost is low, do not need numerous and diverse adjustment program, can produce in a large number, can produce the different advantages such as machine of high or low power easily.
Another purpose of the present invention is to provide the resonance-type switched power supply device of a kind of no-voltage and zero current switching, and it is not influenced by parasitic capacitance and leakage inductance.
For realizing above purpose, the present invention adopts following scheme:
The resonance-type switched power supply device that a kind of no-voltage and zero current switch, comprise: a switching circuit module, it has two or four switching circuits and corresponding switch drive voltage generation circuit, described drive voltage generating circuit is to produce to drive square wave, to carry out semibridge system or the work of full-bridge type switch; One resonant circuit; A transformer is to be connected with resonant circuit, and is connected to the load of power supply unit via rectifier diode; One feedback control circuit is connected between the load and described switch drive voltage generation circuit of this power supply unit, produces the control square wave that can control the effect of described driving square wave or not act on the foundation load, it is characterized in that:
Switching circuit discharges and recharges by its parasitic capacitance, so that its cross-over connection voltage slowly changes when switching; The driving square wave that the switch drive voltage generation circuit is produced has characteristic frequency, can make the resonance current in the described resonant circuit of phase-lead of driving voltage; The driving square wave of this control square wave and described switching circuit is synchronous, makes the driving square wave become integer and the output of unbroken state.
Described switching circuit is made up of transistor, field-effect transistor or gated transistor switch element.
Described each switching circuit all has a bypass diode in parallel with it.
Connect a flywheel inductance between described rectifier diode and the load.
Described resonant circuit comprises a resonant inductance and a resonant capacitance.
Described resonant circuit comprises the resonant capacitance that the inductance that cooperates described transformer carries out resonance work.
Described switch drive voltage is for acting on the square wave that compares less than 50%.
Described phase-control circuit can be guaranteed the phase-lead resonance current of driving voltage.
See also the detailed description and the accompanying drawing thereof of following relevant a preferred embodiment of the present invention, can further understand technology contents of the present invention and purpose effect thereof.
Fig. 1 is the circuit diagram of known resonance-type switched power supply device;
Fig. 2 a, b are the circuit diagram of other known resonance-type switched power supply device;
Fig. 3 a is the semibridge system resonance-type switched power supply device circuit diagram of the resonance-type switched power supply device of a kind of no-voltage of the present invention and zero current switching;
Fig. 3 b is the full-bridge type resonance-type switched power supply device circuit diagram of the resonance-type switched power supply device of a kind of no-voltage of the present invention and zero current switching;
Fig. 4 a is the semibridge system resonance-type switched power supply device circuit diagram according to another preferred embodiments of the present invention;
Fig. 4 b is the full-bridge type resonance-type switched power supply device circuit diagram according to another preferred embodiments of the present invention;
Fig. 5 a is a simplification circuit of the semibridge system resonance-type switched power supply device of Fig. 3 a;
Fig. 5 b is diverter switch driving voltage and a resonance current oscillogram in the semibridge system resonance-type switched power supply device of Fig. 3 a;
Fig. 6 is voltage or a current waveform figure between several elements or node in the semibridge system resonance-type switched power supply device of Fig. 3 a;
Fig. 7 also is voltage or a current waveform figure between several elements or node in the semibridge system resonance-type switched power supply device of Fig. 3 a;
Fig. 8 a, b are the circuit of conventional full bridge formula and semibridge system resonance-type switched power supply device output stage;
Fig. 9 a, b are the circuit of traditional F orward type full-bridge type and semibridge system switched power supply device output stage;
Figure 10 a, b are the circuit of full-bridge type of the present invention and semibridge system resonance-type switched power supply device output stage.
A preferred embodiments structure chart of the present invention is shown in Fig. 3 a, and this framework is a semibridge system framework, and Fig. 3 b is depicted as a full-bridge type framework, no matter semibridge system framework or full-bridge type framework, its operation principle is just the same.With the semibridge system is example, and shown in Fig. 3 a, SW1 and SW2 are switch element among the figure, can be made up of circuit such as transistor, field-effect transistor FET, gated transistor IGBT; C1, C2 are respectively the parasitic capacitance of switch element SW1 and SW2; D1, D2 are bypass diode; C3 is a resonant capacitance; C4, C5 are electrical power by-pass electric capacity; L1 is a resonant inductance; T1 is a transformer, D3 and D4 do full-wave rectification for the output rectifier diode, (but if do halfwave rectifier also can), but L2 is the flywheel inductance (freewheel inductor) of energy storage and decapacitation, C6 is an output filter capacitor, itself and load R parallel connection are with smooth output voltage, and feedback control circuit F can detect the load of power supply unit and produce a control square-wave signal, controls first switch SW 1 and second switch SW2.
The operation principle of foregoing circuit can cooperate Fig. 5-Fig. 7 explanation, and wherein Fig. 5 a is the simplification circuit of Fig. 3 a: Fig. 5 b is the oscillogram of diverter switch driving voltage and resonance current among the key diagram 3a; Fig. 6 is the oscillogram of voltage or electric current between several elements or node among Fig. 3 a; Fig. 7 also is the oscillogram of voltage or electric current between several elements or node among Fig. 3 a.
See also shown in Figure 6ly, when the sequential of switch SW 1 and SW2 and wave mode were shown in curve among Fig. 61 and curve 2, then the relative voltage of A-C point-to-point transmission in theory should be shown in curve 3, and the electric current of resonant circuit should present sinusoidal wave shape shown in curve 4.Supposing to simplify load is a fixed value, and the wave mode of SW1 and SW2 cooperates the specific selection mode of switch drive electric voltage frequency for effect is slightly less than 50% square wave than (duty ratio), and the no-voltage and the zero current that can reach nature switch effect.In the semibridge system resonance-type switched power supply device shown in Fig. 3 a, the sequential of switch SW 1 and SW2 is adjusted to the ω with the natural frequency of oscillation of resonance inductance L 1 and capacitor C 3
oApproaching, and the phase-lead resonance current that makes driving voltage a bit (this is different from when switching frequency is identical with natural frequency of oscillation ω o in the known technology is maximum power), and driving voltage be uninterruptedly continuous.Then produce shown in the curve 4 and curve 5 of Fig. 6, the voltage between the A-C point (curve 5) can nose ahead resonance current (curve 4).In other words, the time difference and specific driving voltage frequency that circuit utilization effect of the present invention is produced less than 50% switch signal than (duty ratio), produce interaction between aftercurrent meeting in the forced harmonic motion circuit and the parasitic capacitance C1 of SW1 and SW2 and the C2, produced natural no-voltage and zero current then and switched.
Further analyze referring to Fig. 5 and work, shown in Fig. 5 b, square wave partly is switch SW 1 and the SW2 relativity voltage for 2 of A-C, sinusoidal wave part is the electric current in the resonant circuit, shown in Fig. 5 a, promptly be the circuit diagram after simplifying, the direction of arrow is to the sense of current that should element among the figure.At time no show t1 but during still near t1, at this moment the resonance current IL1 in the circuit is for just, SW1 is short-circuit condition, SW2 is open-circuit condition, the A point voltage is+VCC, and C1 is the no-voltage cross-over connection, and C2 is the 2VCC charging voltage, D1 and D2 are not conducting state of reverse biased, the electric current of IL1 in time increase and reduce.When arriving t1, IL1 is very little, and at this moment SW1 changes open-circuit condition into, but because IL1 one has the inductance continuous current of inertia; Even if electric current is very little, but flow into resonant circuit because of its continuity still contains with forward, at this moment SW1 just can be the zero current switching.In other words, because electric current is very little, so the parasitic capacitance C1 of its cross-over connection also is slower charging rate charging when SW1 switches, the cross-over connection voltage of SW1 is slowly but not rises rapidly in other words, also forms zero voltage switching simultaneously.If the time continue to increase, at this moment C1 is charging and C2 is discharge, and the A point voltage is very fast from+VCC changes-VCC, and the cross-over connection voltage of SW2 also reduces to zero from 2VCC, if SW2 not conducting as yet at this moment then contains micro-electric current I D2 and is passed to resonant inductance L1.The effect of diode D2 is the safety of protection SW2.If the time continues to increase, at this moment resonance current arrives zero point, simultaneously SW2 switches at once and is conducting state, IL1 is reverse circulated to SW2 then, and the magnitude of current notices that from trace SW2 at this moment switches to conducting state under no-voltage and zero current, under working method so, the voltage that A is ordered can present the wave mode shown in the curve 5 but not (as shown in Figure 6) shown in 3, and the phase place of driving voltage is to take the lead resonance current a bit as can be seen, also obtains to confirm fully in experiment.
In addition when the time arrives next one t3 switching time, t4, identical when its working method and t1, t2, just SW1, SW2, C1, C2, and the role reversal of D1, D2, its operation principle is identical, if the frequency of driving voltage has small drift, so long as the phase place of driving voltage is to take the lead resonance current a bit, the work of system is constant, the aftercurrent that only has a little is by D1 and D2, and whole efficiency is still very high.Also can add phase control in addition, make frequency more stable, so do not conform to the problem that mistake switching time occurs.
Moreover the leakage inductance of parasitic capacitance C1, C2 and T1 is big or small unimportant in this circuit, needs to adjust unlike " full-bridge phase-shift Zero voltage transition device ".Reason is " a full-bridge phase-shift Zero voltage transition device " though be Zero voltage transition, and electric current is very big when conversion, and the charging rate of parasitic capacitance is very fast, want the discharge time of leakage inductance accurately, so bad control, the size of parasitic capacitance and leakage inductance will be fit to relatively, otherwise can not work.But this circuit switches under no-voltage and zero current, so the size of parasitic capacitance and leakage inductance does not play effect to circuit, also obtains to confirm fully in experiment.
Under above-mentioned state, system will present best effort and peak efficiency, and the most important thing is that electromagnetic radiation can not take place, and just set up when still being previous assumed condition, and load can not be constant forever under normal circumstances, and then output voltage will change with load.In order to overcome this difficulty, we have added that special feedback control circuit is controlled, because the frequency of oscillation of this resonant circuit is up to more than the 100k He Zhi, so we can utilize a modulation signal than low frequency, control the output time amount of its high-frequency driving voltage as 1K He Zhi (referring to the curve 6 of Fig. 7), the square-wave voltage of Qu Donging is not interrupted continuously and instead in other words, as shown in Figure 7, wherein the signal of curve 6 is the low frequency controlling signal of feedback control circuit F generation, when it is HIGH, but SW1 and SW2 be operate as normal all, and output as t5 shown between the t6, at this moment system's power output stool and urine is by the time span decision of the modulation signal 6 of low frequency, as can be seen from the figure the signal of SW1 and SW2 might be cut in half, this can make and produce non-zero voltage and non-zero current switching at this point, also produce noise (shown in curve among Fig. 7 10) simultaneously.Solution promptly be make synchronous than the modulation signal 6 and the high-frequency driving voltage of low frequency, allow the high-frequency driving voltage signal present complete in other words and do not have the method for destruction, and the high-frequency driving voltage signal just can be an integer effect, be changed to t5 '-t6 ' by t5-t6 the switching time of SW1 and SW2 in other words, then shown in the resonance current curved 9, use simple control circuit just to obtain effect like this, also errorless from experimental results show that.
Moreover be connection about load, if load is by general connection method, shown in Fig. 8 a and Fig. 8 b (Fig. 8 a is the all-wave structure, and Fig. 8 b is the half-wave structure), then the output at transformer T1 can have problems:
The first, when transformer T1 output voltage rises to voltage VC greater than filter capacitor C6, diode D3, D4 are in moment meeting conducting, at this moment be low impedance state at transformer T1 output, rectifier diode D3, D4 can produce a large amount of electric currents suddenly, this produces outside the change electric current, the voltage waveforms of resonance, a large amount of high frequency noises have more been produced, shown in the curve 10 of Fig. 7.
The second, when transformer T1 output voltage drops to less than VC, rectifier diode D3, D4 are open circuit, be high impedance status at transformer T1 output, at this moment the Q value of resonant circuit is very high, this high Q value inductance capacitor resonant circuit meeting storage power, be that remained shock electric current in the resonant circuit can vibrate always, shown in the curve among Fig. 79, energy consumes fully directly on the element of resonant circuit and can't export, this can make decrease in efficiency, heat increase, and the remained shock energy may dash mutually with next driving voltage, can produce noise like this.
Based on above two point defects, but the flywheel inductance L 2 that comprises an energy storage and decapacitation in each circuit of the present invention is shown in Figure 10 a and Figure 10 b (Figure 10 a is the all-wave structure, and Figure 10 b is the half-wave structure), they it seems and general circuit the spitting image of, but operation principle is different greatly.(Fig. 9 a is the all-wave structure shown in Fig. 9 a and Fig. 9 b, Fig. 9 b is the half-wave structure), the power transformer of general Forword type switched power supply device itself can store electrical energy, the inductance L purpose is to make the output of power transformer T1 and capacitor C produce isolation, and the forward flywheel electric current of inductance L must add that free-wheel diode D makes it to get rid of; But the flywheel inductance L 2 of Figure 10 a need not add free-wheel diode, because its forward the flywheel electric current just can derive the remained shock electric current in the resonant circuit, this consumes at resonant circuit the energy of remained shock electric current no longer voluntarily and exports in the capacitor of output, so very fast elimination of remained shock electric current (shown in curve among Fig. 7 11), this can make efficient improve and the remained shock electric current also significantly reduces with the chance that next driving voltage dashes mutually, from testing also certified correct.From then on this flywheel inductance is different with general filter inductance as can be seen, its inductance value can not as filter inductance more better, if too greatly then make that initial resonance potential is excessive to cause danger, if too little then not effect.
Fig. 4 a is another instantiation of the present invention, and this framework also is a semibridge system, and this is for convenience of description, but referring to Fig. 4 b, the operation principle of notice full-bridge type is also just the same, and wherein T1 is except making transformer, also be resonant inductance, the function of L1 is promptly arranged, so can reduce cost.In this circuit, the selected driving voltage nose ahead resonance current that will make between the A-C point of driving voltage frequency, then can also mating reaction than the time difference that is produced less than 50% switch signal, produce interactive between the parasitic capacitance C1 of aftercurrent in the forced harmonic motion circuit and SW1 and SW2 and the C2, the no-voltage and the zero current that produce nature then switch, and reach the high efficiency effect of no electromagnetic radiation and tool.
The resonance-type switched power supply device that no-voltage provided by the present invention and zero current switch, compare mutually with other known technologies, have more advantages such as high efficiency, low radiation, moreover the present invention also the resonance-type switched power supply device can't mass-produced difficulty as none.Because drive waveforms of the present invention can utilize technique known to produce easily, and the integer pulsed drive only needs can accomplish with some digital circuits, and phase place needs only in advance adjusts frequency of oscillation to optimum, or uses simple phase-locked trace technology also can reach.Flywheel inductance in order to energy storage and decapacitation also can accurately calculate.The size that the most important thing is parasitic capacitance and leakage inductance is inoperative to circuit, so entire circuit is very simple, part seldom and adjust and just can make and to produce in a large number is because half-bridge and full-bridge all can produce, so low-power circuit can not increase too many cost yet.Really be easy to make from experiment confirm, so be one to improve greatly for industry.
Above-listed detailed description system specifying at a possible embodiments of the present invention, only this embodiment is not in order to limit claim of the present invention, allly do not break away from the equivalence that skill spirit of the present invention does and implement or change, all should be contained in the claim of the present invention.
Claims (16)
1. the resonance-type switched power supply device that switches of no-voltage and zero current comprises:
A switching circuit module has four switching circuits and corresponding switch drive voltage generation circuit, and described drive voltage generating circuit is to produce to drive square wave, to carry out the work of full-bridge type switch;
One resonant circuit;
A transformer is connected with resonant circuit, and is connected to the load of power supply unit via rectifier diode;
One feedback control circuit is connected between the load and described switch drive voltage generation circuit of this power supply unit, produces the control square wave that can control the effect of described driving square wave or not act on the foundation load,
It is characterized in that: switching circuit discharges and recharges by its parasitic capacitance, so that its cross-over connection voltage slowly changes when switching; The driving square wave that the switch drive voltage generation circuit is produced has characteristic frequency, can make the resonance current in the described resonant circuit of phase-lead of driving voltage; The driving square wave of this control square wave and described switching circuit is synchronous, makes the driving square wave become integer and the output of unbroken state.
2. by the resonance-type switched power supply device of described no-voltage of claim 1 and zero current switching, it is characterized in that: described switching circuit can be made up of transistor, field-effect transistor or gated transistor switch element.
3. by the resonance-type switched power supply device of described no-voltage of claim 1 and zero current switching, it is characterized in that: described each switching circuit all has a bypass diode in parallel with it.
4. the resonance-type switched power supply device that switches by described no-voltage of claim 1 and zero current is characterized in that: connect a flywheel inductance between described rectifier diode and the load.
5. by the resonance-type switched power supply device of described no-voltage of claim 1 and zero current switching, it is characterized in that: described resonant circuit comprises a resonant inductance and a resonant capacitance.
6. the resonance-type switched power supply device that switches by the described no-voltage of claim 1 and zero current is characterized in that: described resonant circuit comprises a resonant capacitance that cooperates the inductance of described transformer to carry out resonance work.
7. the resonance-type switched power supply device that switches by the described no-voltage of claim 1 and zero current is characterized in that: described switch drive voltage for effect than less than 50% square wave.
8. by the resonance-type switched power supply device of described no-voltage of claim 1 and zero current switching, it is characterized in that: described phase-control circuit can be guaranteed the phase-lead resonance current of driving voltage.
9. the resonance-type switched power supply device that switches of no-voltage and zero current comprises:
A switching circuit module has two switching circuits and corresponding switch drive voltage generation circuit, and described drive voltage generating circuit is to produce to drive square wave, to carry out the work of semibridge system switch;
One resonant circuit;
A transformer is connected with resonant circuit, and is connected to the load of power supply unit via rectifier diode;
One feedback control circuit is connected between the load and described switch drive voltage generation circuit of this power supply unit, produces the control square wave that can control the effect of described driving square wave or not act on the foundation load,
It is characterized in that: switching circuit discharges and recharges by its parasitic capacitance, so that its cross-over connection voltage slowly changes when switching; The driving square wave that the switch drive voltage generation circuit is produced has characteristic frequency, can make the resonance current in the described resonant circuit of phase-lead of driving voltage; The driving square wave of this control square wave and described switching circuit is synchronous, makes the driving square wave become integer and the output of unbroken state.
10. by the resonance-type switched power supply device of described no-voltage of claim 9 and zero current switching, it is characterized in that: described switching circuit is made up of transistor, field-effect transistor or gated transistor switch element.
11. by the resonance-type switched power supply device that described no-voltage of claim 9 and zero current switch, it is characterized in that: described each switching circuit all has a bypass diode in parallel with it.
12. the resonance-type switched power supply device by described no-voltage of claim 9 and zero current switch is characterized in that: connect a flywheel inductance between described rectifier diode and the load.
13. by the resonance-type switched power supply device that described no-voltage of claim 9 and zero current switch, it is characterized in that: described resonant circuit comprises a resonant inductance and a resonant capacitance.
14. the resonance-type switched power supply device by the described no-voltage of claim 9 and zero current switch is characterized in that: described resonant circuit comprises a resonant capacitance that cooperates the inductance of described transformer to carry out resonance work.
15. the resonance-type switched power supply device by the described no-voltage of claim 9 and zero current switch is characterized in that: described switch drive voltage for effect than less than 50% square wave.
16. by the resonance-type switched power supply device that described no-voltage of claim 9 and zero current switch, it is characterized in that: described phase-control circuit can be guaranteed the phase-lead resonance current of driving voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00121243A CN1338811A (en) | 2000-08-09 | 2000-08-09 | Resonance-type switched power supply with zero-voltage and zero-current switching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00121243A CN1338811A (en) | 2000-08-09 | 2000-08-09 | Resonance-type switched power supply with zero-voltage and zero-current switching |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007516689A (en) * | 2003-12-17 | 2007-06-21 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Emergency light device and emergency light system |
| CN100446398C (en) * | 2005-11-22 | 2008-12-24 | 福建龙净环保股份有限公司 | Resonance switch driving controlling and protecting circuit |
| CN101180787B (en) * | 2005-05-20 | 2010-11-17 | 艾思玛太阳能技术股份公司 | Bi-directional battery power inverter |
-
2000
- 2000-08-09 CN CN00121243A patent/CN1338811A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007516689A (en) * | 2003-12-17 | 2007-06-21 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Emergency light device and emergency light system |
| CN101180787B (en) * | 2005-05-20 | 2010-11-17 | 艾思玛太阳能技术股份公司 | Bi-directional battery power inverter |
| USRE45069E1 (en) | 2005-05-20 | 2014-08-12 | Sma Solar Technology Ag | Bidirectional battery power inverter |
| CN100446398C (en) * | 2005-11-22 | 2008-12-24 | 福建龙净环保股份有限公司 | Resonance switch driving controlling and protecting circuit |
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