CN1310409C - DC/dc boosting transformer and control method - Google Patents
DC/dc boosting transformer and control method Download PDFInfo
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- CN1310409C CN1310409C CNB021490473A CN02149047A CN1310409C CN 1310409 C CN1310409 C CN 1310409C CN B021490473 A CNB021490473 A CN B021490473A CN 02149047 A CN02149047 A CN 02149047A CN 1310409 C CN1310409 C CN 1310409C
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Abstract
The present invention discloses a DC/DC voltage increase conversion device and a control method. The device comprises an inductor, an electronic power switch, a control circuit, a first diode, a second diode and a capacitor, wherein the inductor and the electronic power switch are in bridge connection to an input DC power after being connected with each other in series, and the control circuit is connected to the electronic power switch. The first diode is in bridge connection to the connecting part of the inductor and the electronic power switch and the positive end of an output end. The capacitor and the second diode are in bridge connection between the positive end of an input and the positive end of the output end after being connected with each other in parallel. The DC/DC voltage increase conversion device of the present invention can provide a comparatively stable DC voltage, and a supplied load can be free from the influence of the voltage decrease of a DC voltage source; moreover, the present invention has the efficiency higher than that of the existing DC/DC voltage increase conversion device.
Description
Technical field
The present invention relates to a kind of dc/dc boost conversion equipment, specially referring to be applied in provides one than the galvanic current pressure in the electronic circuit, make the load of supply not be subjected to the DC/DC conversion device that direct voltage source voltage descends to be influenced.
Background technology
General direct voltage source can be supplied with by ac/dc rectifier or storage battery, load is then taken out direct current energy from this direct voltage source and is used, on motor driver or uninterruptible power system, this load can be an inverter (inverter) for the motor driven power supply or supply with high-quality AC energy, this load also can be other DC load, and no matter which kind of load all must just can be kept normal running in a certain voltage range.Yet this ac/dc rectifier is supplied with direct voltage source owing to be subjected to the unusual low-voltage of AC power, causes its direct voltage source of supplying with also to produce low-voltage; Same, then may cause its direct voltage source of supplying with also to produce low-voltage, and these low-voltage states all may cause the misoperation of follow-up power consumption equipment if supply with direct voltage source owing to influenced by the deep discharge of storage battery own with storage battery.In order to solve the problem that direct voltage source generation voltage descends, utilize adding one direct current/DC voltage booster circuit to come to deal with the voltage decline problem of this direct voltage source, to keep the normal operation of load.
Fig. 1 discloses the circuit diagram of existing dc/dc boost circuit.Please refer to shown in Figure 1ly, one direct current/DC voltage booster circuit 1 places between input dc power potential source Vin and the output end vo ut, and it comprises an inductor 10, an electronic power switch 11, a diode 12 and a capacitor 13.When these electronic power switch 11 closures, this inductor 10 charges.When this electronic power switch 11 disconnected, the charging of this inductor 10 was converted to this capacitor 13 through this diode 12 and charges and use for load.By closure and the opening time of controlling this electronic power switch 11, can provide a voltage that is higher than input dc power potential source Vin at the output end vo u of this dc/dc boost circuit 1.No matter the voltage of this input dc power potential source Vin is normal, or this input DC power vin descends because of unusual low-voltage of the alternating voltage of ac/dc rectifier or storage battery deep discharge etc. cause voltage, this dc/dc boost circuit 1 all keeps running, so the power loss that this dc/dc boost circuit 1 is caused exists always, because direct voltage source produces voltage and drops to anomaly, life period is not long, if this dc/dc boost circuit 1 keeps running will cause whole DC power-supply system efficient to reduce, and the heat increase that this power loss caused also needs bigger heat abstractor to dispel the heat always.
Summary of the invention
The purpose of this invention is to provide a kind of dc/dc boost conversion equipment, direct voltage source just often this DC/DC conversion device do not turn round, this direct voltage source directly provides output voltage through a diode to output, and when the voltage of direct voltage source descends, then utilize this dc/dc boost conversion equipment to descend so that the voltage that overcomes direct voltage source that boosts to be provided, therefore can provide a more stable VD, to improve the reliability of follow-up load electricity consumption.This DC/DC conversion device is running when the voltage of direct voltage source descends only, so that the power loss that this DC/DC conversion device produced can drop to is minimum, to promote the efficient of whole direct-current power supply system.
The present invention is achieved in that
A kind of dc/dc boost conversion equipment, it comprises with the lower part: whether a control circuit in order to the input voltage of the input that detects this conversion equipment and the output voltage of an output, is lower than a predetermined voltage to judge this input voltage; This control circuit comprises one first voltage detector, a subtracter, a controller, a comparator, a high frequency triangle wave generator, one second voltage detector, a hysteresis comparator, one and a door and an electronic power switch drive circuit; One electronic power switch is connected to this control circuit, is determined the state of this electronic power switch by this control circuit; One inductor, the back cross-over connection of connecting with electronic power switch in input DC power to charge and to discharge: one first diode cross-over connection is between the anode of the junction of this inductor and this electronic power switch and output; One capacitor, cross-over connection is between the anode of the anode of input and output; And one second diode, be connected in parallel with this capacitor; The output end voltage of this dc/dc boost conversion equipment is this input DC power voltage and this condenser voltage sum, and a voltage that is higher than this input DC power voltage can be provided; This first voltage detector detects output voltage, through this subtracter, controller and high frequency triangle wave generator be connected to this comparator and obtain a pulse-width modulation signal deliver to this with the door an input; This second voltage detector detects this input DC power voltage, is connected to this and another input of door through this hysteresis comparator, should be connected to this electronic power switch with door output; This control circuit is that this input DC power voltage is judged relatively that with a high/low reference voltage this input DC power voltage is normal condition or low-voltage state respectively; When this input DC power voltage is normal condition, keeps this electronic power switch and disconnect; When this input DC power voltage is low-voltage state, controls this electronic power switch and do the pulse-width modulation switching.
According to dc/dc boost conversion equipment of the present invention, this device has an input and an output, and this device comprises an inductor, an electronic power switch, a control circuit, one first diode, one second diode and a capacitor.This input is connected to a direct current voltage source, and this direct voltage source can be ac/dc rectifier or storage battery, and this output is received load, and this load can be inverter or other DC load; This inductor and electronic power switch series connection cross-over connection are in this input DC power, and this control circuit is connected in this electronic power switch, and this first diode cross-over connection is in the anode of this inductor and electronic power switch junction and this output.The cross-over connection in parallel of this capacitor and second diode is between the anode of the anode of this input and this output.This control circuit utilizes a voltage hysteresis comparator that input direct voltage is divided into a high reference voltage and a low reference voltage is made comparisons, when being higher than a high reference voltage, input direct voltage regards as normal condition, this control circuit is controlled an electronic power switch and is kept to disconnect and be failure to actuate, thereby do not carry out boost action, input direct voltage directly exports load to via this second diode, and output end voltage approximates input dc power potential source voltage.When input direct voltage is lower than this low reference voltage, regard as low-voltage state, this control circuit is controlled this electronic power switch and is done the pulse-width modulation switching, and when this electronic power switch was closed, this inductor charged; When this electronic power switch disconnects, the electric energy of this inductor is converted to this capacitor through this first diode and forms a voltage, this second diode is instead ended partially, at this moment, this output output voltage is the voltage of this input direct voltage and the series connection of this condenser voltage, therefore can reach the effect of boosting.
Because of DC/DC conversion device of the present invention has the function of boosting, therefore can make the working range of input direct voltage quite wide, avoid its power consumption equipment to cause misoperation because of the input voltage source low-voltage.In addition, this DC/DC conversion device only turns round under the input voltage source low-voltage, just often then do not turn round in order to avoid this DC/DC conversion device is operated the power loss that is caused always at input voltage source, therefore can effectively promote the efficient of whole direct-current power supply system.
The present invention utilizes the dc/dc boost conversion equipment to provide one than the galvanic current pressure, not influenced by the voltage decline of direct voltage source; And at DC power supply voltage just often, this dc/dc boost conversion equipment of shut-down operation is to avoid the outer power loss of amount.
Description of drawings
Fig. 1 is the circuit diagram of existing dc/dc boost circuit;
Fig. 2 is the circuit diagram of preferred embodiment dc/dc boost conversion equipment of the present invention;
Fig. 3 is the control calcspar of preferred embodiment dc/dc boost conversion equipment of the present invention;
Fig. 4 is the preferred embodiment that dc/dc boost conversion equipment of the present invention is applied in two direct voltage origin systems.
Symbol description:
1 dc/dc boost circuit, 10 inductors, 11 electronic power switches
12 utmost point pipes, 13 capacitors
2 dc/dc boost conversion equipments
21 inductors, 22 electronic power switches, 23 control circuits
230 first voltage detectors, 231 subtracters, 232 controllers
233 comparators, 234 high frequency triangle wave generators
235 second voltage detectors, 236 hysteresis comparators 237 and door
238 electronic power switch drive circuits, 24 first diodes, 25 second diodes
26 capacitors, 3 inputs, 4 outputs
5 first direct voltage sources, 6 second direct voltage sources, 7 diodes
8 inverters, 9 AC load
50 ac/dc rectifiers, 51 filtering capacitors
Embodiment
In order to allow above-mentioned and other purposes of the present invention, feature and advantage understand by clearer and more definite quilt, hereinafter will be especially exemplified by preferred embodiment of the present invention, and cooperate appended legend, be described in detail below:
Fig. 2 discloses the circuit diagram of preferred embodiment dc/dc boost conversion equipment of the present invention; And Fig. 3 discloses the control calcspar of preferred embodiment dc/dc boost conversion equipment of the present invention.
Please refer to shown in Figure 2, the dc/dc boost conversion equipment 2 of preferred embodiment of the present invention has an input 3 and an output 4, this input 3 is connected to a direct current voltage source, this direct voltage source can be the ac/dc rectifier or storage battery provides, this output is received load, this load can be inverter or other direct-flow electricity utilization apparatus, because the action of this dc/dc boost conversion equipment 2, make output 4 that a more stable VD supply load can be provided, so that load avoids being subjected to the influence of input dc power potential source low-voltage and causes misoperation.
Referring again to shown in Figure 2, this dc/dc boost conversion equipment 2 comprises an inductor 21, an electronic power switch 22, a control circuit 23, one first diode 24, one second diode 5 and a capacitor 26.On circuit framework, the series connection cross-over connection of this inductor 21 and electronic power switch 22 is in this input 3, and this control circuit 23 is connected in this electronic power switch 22.These first diode, 24 cross-over connections are in the anode of this inductor 21 and electronic power switch 22 junctions and this output 4.The parallel connection of this capacitor 26 and second diode 25 then cross-over connection between the anode of the anode of this input 3 and this output 4.
Please refer to shown in Figure 3ly, this control circuit 23 comprises one first voltage detector 230, a subtracter 231, a controller 232, a comparator 233, a high frequency triangle wave generator 234, one second voltage detector 235, a hysteresis comparator 236, one and door 237 and one electronic power switch drive circuit 238.
Please refer to Fig. 2, shown in Figure 3, this first voltage detector 230 is connected to this output 4, out detects with output voltage V, export the negative terminal of this subtracter 231 again to, the anode of this subtracter 231 then connects a setting voltage Vset, both subtract each other and obtain the result and export this controller 232 to and compensate adjustment to obtain one first control signal S1, and this setting voltage Vset is the desired value of output dc voltage.This high frequency triangle wave generator 234 produces a high frequency triangle wave signal, and this high frequency triangle wave signal and the first control signal S1 deliver to this comparator 233 to obtain a pulse-width modulation signal.On the other hand, this second voltage detector 235 detects the input direct voltage Vin of input DC power, and this an input direct voltage Vin and a reference voltage Vref are inputed to this hysteresis comparator 236, so produces one second control signal S2.This second control signal S2 and pulse-width modulation signal are inputed to this and door 237, should deliver to this electronic power switch drive circuit 238 with door 237 output signals and export this electronic power switch 22 to control its closed and disconnection to produce a drive signal.
Please refer to shown in Figure 3ly, this hysteresis comparator 236 produces a high reference voltage and a low reference voltage according to this reference voltage Vref.When the input direct voltage Vin that detects when this second voltage detector 235 is lower than a low reference voltage, the second control signal S2 that this hysteresis comparator 236 produces high levles to should and door 237, make this dc/dc boost conversion equipment 2 activations.On the other hand, output voltage V out and the setting voltage Vset that detected by this first voltage detector 230 this moment compare, and both subtract each other the result and export this controller 232 to produce the first control signal S1.This first control signal S1 exports this comparator 233 again to and relatively produces the pulse-width modulation signal in the back with the high frequency triangle wave signal that this frequency triangular wave generator 234 produces.Because this second control signal S2 is high levle, so this pulse-width modulation signal exports this power electronics drive circuit 238 to and drives these electronic power switches 22 and make pulse-width modulation and switch.Referring again to shown in Figure 2, when these electronic power switch 22 closures, these inductor 21 chargings, and when this electronic power switch 22 disconnects, the electric energy of this inductor 21 exports this capacitor 26 to form a voltage Vaux via this first diode 24, at this moment, this second diode 25 instead ends partially, and these output 4 output voltages are the input direct voltage Vin of this input 3 and the voltage Vaux series connection formation boost function of this capacitor 26.So when the input direct voltage Vin of this input 3 low-voltage, can reach boost function, run well to avoid these output 4 output LOW voltages to influence load by this dc/dc boost conversion equipment 2.
Referring again to shown in Figure 3, the input direct voltage vin that detects when this second voltage detector 235 gos up when being higher than a high reference voltage, the second control signal S2 of these hysteresis comparator 236 outputs is returned to low level, the second control signal S2 of this low level delivers to this and door 237, should also be converted to low level with door 237 outputs, and make this electronic power switch 22 keep disconnection always.Referring again to shown in Figure 2, when this electronic power switch 22 is kept disconnection always, this dc/dc boost conversion equipment 2 is with anergy, input direct voltage Vin directly outputs to output 4 to supply with load via this second diode 25, this moment, the voltage of output 4 was similar to the voltage that input connects the input dc power potential source, and do not boost, this moment, this dc/dc boost conversion equipment 2 was failure to actuate, and therefore can avoid the power loss of this dc/dc boost conversion equipment action.
Please refer to and Figure 4 shows that dc/dc boost conversion equipment 2 of the present invention is applied in the preferred embodiment of two direct voltage origin systems, comprise an ac/dc rectifier 50 and a filtering capacitor 51 in this first direct voltage source 5, this ac/dc rectifier 50 converts the AC energy that this ac power input end provided to a direct current electric energy, does voltage stabilizing to become this first direct voltage source 5 through this filtering capacitor 51 again; This second direct voltage source 6 is provided by storage battery, and this second direct voltage source 6 is connected with dc/dc boost conversion equipment 2 through this diode 7 and this first direct voltage source 5 again and is connected in parallel to provide one to be higher than under inverter 8 normal runnings required minimum lower voltage limit supply AC load 9 and to use.When this ac power input end provided normal alternating voltage, this first direct voltage source 5 also provided normal direct voltage, and this moment, this dc/dc boost conversion equipment 2 did not act on.The direct voltage that this first direct voltage source provides will be higher than second direct voltage source, 6 voltages, so these diode 7 reverses biased, this moment, inverter 8 required direct current energies were by these first direct voltage source, 5 supplies, when the voltage that provides when this ac power input end produces fault such as low-voltage or power failure, the voltage that this first direct voltage source 5 provides also will descend, if the voltage that the voltage that provides of this first direct voltage source 5 is lower than this second voltage source 6 then second diode 25 of these dc/dc boost conversion equipment 2 inside and this diode 7 all with forward bias voltage drop and conducting, therefore, these inverter 8 required direct current energies will change by 6 supplies of this second direct voltage source, when the voltage of this second direct voltage source 6 is reduced to the low reference voltage that these dc/dc boost conversion equipment 2 internal control circuits set because of discharge (approximating the following minimum lower voltage limit of inverter 8 normal runnings), then this dc/dc boost conversion equipment 2 produces boost action with activation, makes the direct-flow input end voltage of this inverter 8 can maintain its normal operating limit.When alternating voltage that this ac power input end provided recovers normal, the direct voltage that this moment, this first direct voltage source 5 provided will be higher than the high reference voltage that these dc/dc boost conversion equipment 2 internal control circuits are set, therefore this dc/dc boost conversion equipment 2 no longer acts on, these diode 7 reverses biased, these inverter 8 required direct current energies are once again by these first direct voltage source, 5 supplies.Because this second direct voltage source 6 connects to provide direct current energy to inverter 8 through this dc/dc boost conversion equipment 2 when the ac power input end fault, therefore when having this dc/dc boost conversion equipment 2 when voltage descends fast because of repid discharge produces, this second direct voltage source 6 assists to boost, therefore, can more make full use of the electric energy of storage battery in this second direct voltage source 6, make this storage battery energy deep discharge, so can adopt less storage battery to be used as second direct voltage source 6.Refer again in the preferred embodiment that dc/dc boost conversion equipment of the present invention shown in Figure 4 is applied in two direct voltage origin systems, when if the direct voltage that storage batterys are supplied in this second direct voltage source 6 is lower than the required minimum lower voltage limit of these inverter 8 normal runnings, then this dc/dc boost conversion equipment 2 will be kept boost action always, arrive more than the required minimum lower voltage limit of these inverter 8 normal runnings with the anode voltage that promotes this diode 7.When this ac power input end provides normal voltage, this first direct voltage source 5 also provides a normal voltage, the normal voltage that this first direct voltage source 5 provides will be higher than the output voltage of this dc/dc boost conversion equipment 2, this diode 7 is a reverse biased, and the required direct current energy of inverter this moment is supplied with by first direct voltage source 5.Therefore, when this ac input end provides voltage to produce low-voltage or fault, this second direct voltage source 6 boosts to the minimum lower voltage limit that is higher than inverter 8 normal runnings through dc/dc boost conversion equipment 2, supply with direct current energy through this diode 7 and use for this inverter 8, make inverter 8 can continue normal running.In this application examples, because second direct voltage source, 6 voltages are lower than the minimum lower voltage limit of these inverter 8 normal runnings, therefore these dc/dc boost conversion equipment 2 permanent activations will not be so second diode 25 in this dc/dc boost conversion equipment 2 will act on.
Though the present invention discloses with aforementioned preferred embodiment, so it is not in order to limiting the present invention, anyly has the knack of this operator, without departing from the spirit and scope of the present invention, and when doing various changes and modification.So the claim that protection scope of the present invention ought be looked in the claims of front is as the criterion.
Claims (13)
1, a kind of dc/dc boost conversion equipment is characterized in that comprising with the lower part:
Whether one control circuit in order to the input voltage of the input that detects this conversion equipment and the output voltage of an output, is lower than a predetermined voltage to judge this input voltage; This control circuit comprises one first voltage detector, a subtracter, a controller, a comparator, a high frequency triangle wave generator, one second voltage detector, a hysteresis comparator, one and a door and an electronic power switch drive circuit;
One electronic power switch is connected to this control circuit, is determined the state of this electronic power switch by this control circuit;
One inductor, the back cross-over connection of connecting with electronic power switch in input DC power to charge and to discharge:
One first diode cross-over connection is between the anode of the junction of this inductor and this electronic power switch and output;
One capacitor, cross-over connection is between the anode of the anode of input and output; And
One second diode is connected in parallel with this capacitor;
The output end voltage of this dc/dc boost conversion equipment is this input DC power voltage and this condenser voltage sum, and a voltage that is higher than this input DC power voltage can be provided; This first voltage detector detects output voltage, through this subtracter, controller and high frequency triangle wave generator be connected to this comparator and obtain a pulse-width modulation signal deliver to this with the door an input; This second voltage detector detects this input DC power voltage, is connected to this and another input of door through this hysteresis comparator, should be connected to this electronic power switch with door output;
This control circuit is that this input DC power voltage is judged relatively that with a high/low reference voltage this input DC power voltage is normal condition or low-voltage state respectively; When this input DC power voltage is normal condition, keeps this electronic power switch and disconnect; When this input DC power voltage is low-voltage state, controls this electronic power switch and do the pulse-width modulation switching.
2, the described dc/dc boost conversion equipment of claim 1 is characterized in that this first diode is as the path of this inductor to this capacitor discharge.
3, the described dc/dc boost conversion equipment of claim 1 is characterized in that this second diode is the bypass path as this capacitor.
4, the described dc/dc boost conversion equipment of claim 1, it is characterized in that when this input DC power voltage is normal condition, this electronic power switch is kept disconnection always, and the electric energy of this input DC power directly flows to output through this second diode and do not make boost action.
5, the described dc/dc boost conversion equipment of claim 1, it is characterized in that when this input DC power voltage is low-voltage state, this electronic power switch is made pulse-width modulation and is switched, inductor charges when this electronic power switch is closed, the electric energy of this inductor is released into this capacitor to form a voltage via this first diode when this electronic power switch disconnects, make this second diode reverse bias voltage, this output output voltage is this input dc power potential source voltage and this condenser voltage sum.
6, the described dc/dc boost conversion equipment of claim 1 is characterized in that regarding as low-pressure state when the voltage of this input input DC power is lower than this low reference voltage; When being higher than this high reference voltage, the voltage of this input input DC power regards as normal condition.
7, the described dc/dc boost conversion equipment of claim 1, when it is characterized in that voltage when this input input dc power potential source is between low reference voltage and high reference voltage, this control circuit is kept former identification state and is not changed, promptly regarding as low-voltage state originally then keeps and regards as low-voltage state, originally regarded as normal condition and then keep and regard as normal condition, changed often to prevent the identification state.
8, the described dc/dc boost conversion equipment of claim 1 is characterized in that this and door output are connected to this electronic power switch drive circuit and export this electronic power switch to control the closed of this electronic power switch and to disconnect to produce a drive signal.
9, the described dc/dc boost conversion equipment of claim 1 is characterized in that when the input dc power potential source is normal condition, and this hysteresis comparator is exported a low level signal, should export a low level signal with door, and this electronic power switch disconnects.
10, the described dc/dc boost conversion equipment of claim 1, it is characterized in that when the input dc power potential source is low-pressure state, this hysteresis comparator is exported a high levle signal, should export a pulse-width modulation signal with door, and this electronic power switch is made pulse-width modulation and switched.
11, the described dc/dc boost conversion equipment of claim 1, it is characterized in that this dc/dc boost conversion equipment can be applicable to two direct voltage origin systems, wherein first DC power supply can be by AC power through the rectifying and wave-filtering supply, second DC power supply can be by the storage battery supply, the input of this dc/dc boost conversion equipment is connected to this second DC power supply, and the output of this dc/dc boost conversion equipment is connected to this first DC power supply through a diode.
12, the described dc/dc boost conversion equipment of claim 11, when it is characterized in that this dc/dc boost conversion equipment is applied in two direct voltage origin system, but this dc/dc boost conversion equipment will be exported a voltage that is higher than the lower voltage limit of load normal running.
13, the described dc/dc boost conversion equipment of claim 11, when it is characterized in that this dc/dc boost conversion equipment is applied in two direct voltage origin system, just often it supplies the output voltage that voltage will be higher than this dc/dc boost conversion equipment when first DC power supply, and load is by this first DC power supply; Its supply voltage will be lower than the output voltage of this dc/dc boost conversion equipment when the first DC power supply fault, and load changes by this second DC power supply through this dc/dc boost conversion equipment power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021490473A CN1310409C (en) | 2002-11-20 | 2002-11-20 | DC/dc boosting transformer and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021490473A CN1310409C (en) | 2002-11-20 | 2002-11-20 | DC/dc boosting transformer and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1503441A CN1503441A (en) | 2004-06-09 |
| CN1310409C true CN1310409C (en) | 2007-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021490473A Expired - Lifetime CN1310409C (en) | 2002-11-20 | 2002-11-20 | DC/dc boosting transformer and control method |
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| CN (1) | CN1310409C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100456618C (en) * | 2005-05-24 | 2009-01-28 | 台达电子工业股份有限公司 | Non-isolation DC/AC inverter |
| JP2008004038A (en) | 2006-06-26 | 2008-01-10 | Ricoh Co Ltd | Voltage regulator |
| US9088224B2 (en) * | 2010-07-21 | 2015-07-21 | Lihua Chen | Variable voltage converter with stabilized output voltage |
| KR101141416B1 (en) * | 2010-08-18 | 2012-05-04 | 삼성전기주식회사 | Power supply with improved system efficiency |
| US8680795B2 (en) * | 2011-06-03 | 2014-03-25 | Ford Global Technologies, Llc | Vehicle electric drive and power systems |
| CN106160521A (en) * | 2015-04-21 | 2016-11-23 | 沛旸科技有限公司 | Power supply unit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06133539A (en) * | 1992-10-16 | 1994-05-13 | Fujitsu Ltd | Step-up dc-dc converter |
| JPH1138465A (en) * | 1997-07-17 | 1999-02-12 | Olympus Optical Co Ltd | Power source circuit |
-
2002
- 2002-11-20 CN CNB021490473A patent/CN1310409C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06133539A (en) * | 1992-10-16 | 1994-05-13 | Fujitsu Ltd | Step-up dc-dc converter |
| JPH1138465A (en) * | 1997-07-17 | 1999-02-12 | Olympus Optical Co Ltd | Power source circuit |
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| CN1503441A (en) | 2004-06-09 |
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