CN1064573A - Low-voltage dc power supply - Google Patents
Low-voltage dc power supply Download PDFInfo
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- CN1064573A CN1064573A CN 92101254 CN92101254A CN1064573A CN 1064573 A CN1064573 A CN 1064573A CN 92101254 CN92101254 CN 92101254 CN 92101254 A CN92101254 A CN 92101254A CN 1064573 A CN1064573 A CN 1064573A
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Abstract
A low voltage DC power supply has an output of, for example, 5V and an input DC voltage of, for example, 300V. Each of a set of switched transformers comprises a primary winding (L1) for switching with an input and a secondary winding (L2) for switching with an output, electronic switches (M1 to M8) alternately switch the windings (L1, L2) with opposite polarities, and a common control means (10) controls the switching such that no two of the transformers in a set are switched simultaneously. In order not to be affected by the high-frequency output current surge, filters (L9, L10, C10 to C12) are provided on the input side.
Description
The present invention is relevant with a kind of equipment from higher direct voltage source acquisition low-voltage dc power supply.
The standard method that acquisition is used for the low-voltage dc power supply of various electronic circuits be with AC supply voltage in the transformer transformation, obtain low-voltage AC, then rectification.When the electric current of needs and power ratio were big, this method of dealing with problems had its shortcoming, in this case, just need draw large-area conductor from the centrally connected power supply unit of necessity, so along with the increase of power consumption, efficient generally is very low, caused loss must be removed by cooling.
General purpose of the present invention is to obtain a kind of low-voltage dc power supply, and its volume is enough little, so that lay near load, has avoided using long large-area conductor like this.
Another object of the present invention is to obtain a kind of low-voltage dc power supply, and it allows the high-frequency percussion of electric current, and can not produce interference to main circuit.
The 3rd purpose of the present invention is to obtain a kind of low-loss low-voltage dc power supply.
According to the present invention, described and other purpose and advantage can have the low-voltage dc power supply that the input of higher direct voltage and low-voltage direct export and obtain by a kind of, it comprises one group of voltage transformation unit, all there is the terminal that links to each other with each said direct current input and output each said unit, each said unit all comprises a transformer core, its former limit winding links to each other with said DC input voitage, its secondary winding links to each other with said VD, and comprise that connects a network, this network comprises the gate-controlled switch device, be used for said DC input voitage under the control of a clock pulse sequence, mode with reverse switches to said former limit winding, and with said VD under the control of same clock pulse sequence, mode with reverse switches to said secondary winding, said one group of voltage transformation unit is controlled jointly, so that switch, in some moment, when a transformer unit was switching, another voltage transformation unit was not switched at least.
According to a most preferred embodiment, concerning each of unit group, former limit electric bridge and at least one secondary electric bridge that comprises four gate-controlled switches is arranged all, this day the secondary electric bridge also comprise four gate-controlled switches.
In a typical example, such power supply can obtain from the 300V direct voltage source, and output 5V direct voltage.If at output an impulse current is fast arranged, also can experience similar impact at input so.This impact energy is absorbed by the capacitor of 300V input and/or inductor network effectively, and its capacitance is approximately 1/3600th of the condenser capacity that has identical impact-attenuating effect but be connected equipment output end.In addition, under the situation of desired high capacitance, consider the series electrical sensibility reciprocal that certainly exists in low pressure and the great capacitor of capacity, be difficult to obtain same attenuating.
According to a most preferred embodiment, two voltage transformation unit constitute a common means, have FERRITE CORE and winding, switching device and the control circuit that is installed on the polymer flake, and these parts combine with a cooling fin with appropriate format.
Preferably make control circuit not only can handle the low situation of carrying, can also handle overload situations.When the connection short time between I/O and each winding disconnected, input capacitance or the additional shunt capacitor of output by load can keep VD constant basically.
Though concerning some is used, only there are two voltage transformation unit just enough, their time services that staggers, so that when switching for one, another always is in running status, but in other application, the number of voltage transformation unit can also be more, therefore whenever have only one of them switching at most.So owing to the do not power loss that causes of voltage transformation unit between transfer period will be remedied by a plurality of other voltage transformation unit.
Be preferably in to connect and comprise one group of auxiliary winding in the network, be used to the switch control power supply and the control circuit power supply that provide necessary.In order to start working, the control circuit that switches former limit winding obtains power supply from DC input voitage, and the required power supply of control circuit that switches the secondary winding then all obtains from auxiliary winding.So only need input direct voltage, all power supply is just self-sufficient.VD and input electric current separate, so avoided earth current.
But the switch of former limit winding and secondary winding is in former limit one side MOS transistor.And,, preferably making several single windings that their switch is all arranged because electric current is very big in secondary one side, these switch in parallel connect.Switch and winding can be mounted in the TAB band on the plastic tab, and this thin slice has opening, is used to pass ferrite core.
Below in conjunction with illustrated embodiment the present invention is described in more detail, it is limitation of the present invention that these embodiment should not be considered as, and should regard the elite of characteristics of the present invention and advantage as.
Fig. 1 is only one the sketch in one group of cooperative switchable transformer, and its control circuit has also drawn.
Fig. 2 is the one group of transducer that is added in the power supply of the present invention, represents with black surround.
Fig. 3 is the state diagram of control system.
Fig. 4 represents that the time of switching interval distributes.
Fig. 5 is illustrated in the voltage that records on the secondary winding of two cooperative transformer units.
Fig. 6 and Fig. 7 represent former limit winding and secondary winding respectively.
Winding construction on Fig. 8 indication transformer iron core.
Fig. 9-11 represents embodiments of the invention, is installed on the cooling fin, constitutes independent parts.
Fig. 1 is one group will become one sketch in the circuit of 5V direct current output as 300V direct current input.A ferrite transformer core (not shown) has a former limit winding L 1, about 60 circles, a secondary winding L 2,1 circles and eight auxiliary winding AL1 to AL8.Around former limit winding L 1, form a former limit electric bridge, comprise electronic switch M1 to M4, as shown in the figure.Around secondary winding L 2, form a secondary electric bridge, comprise electronic switch M5 to M8.This is in order to make the conducting in couples of each switch, like this under a kind of mode, and M1 and M4 conducting, and under opposite way, M2 and M3 conducting.Under the third mode, any one not conducting of switch.During first kind of mode, in the secondary electric bridge, make M5 and M8 conducting, during the second way, make M6 and M7 conducting.To reach this purpose is condition, and in conducting phase, the output of secondary electric bridge can be the 5V direct voltage.When switching, have at least another similar device (not shown) that the 5V direct current can be provided.
Remaining part in the electric bridge shown in Figure 1 has participated in the described work that this unit is switched.The trigger electric bridge of forming by MOS switch T1 to T4 and T5 to T8 trigger switch separately respectively.The trigger electric bridge of at first mentioning obtains start-up energy from a voltage divider D, gives storage capacitance C13 charging, and this voltage divider can have very high impedance, as 300Mohm/1nF, and when the stage of power supply, is 10Mohm/30nG.Therefore, in case imported the 300V direct voltage, former limit trigger electric bridge will trigger by the pulse at T1+T4 and T2+T3 respectively.In case make its conducting, former limit electric bridge can produce voltage on secondary winding L 2 and auxiliary winding AL5 to AL8, and they are arranged by polarity, to improve switching capability separately.
Electronic switch M1 to M8 is the CMOS transistor, and odd numbered is the P raceway groove, and even number is the n raceway groove.
A DC power supply according to the present invention comprise two or more such transformer/electric bridges to or transducer, they work together.In the embodiment that gives an example, two have been used.
Like this, another in the transducer of two parallel connections comprises two electric bridges, at the former limit and the secondary of transformer an electric bridge arranged respectively.
Each electric bridge constitutes a flip and flop generator.Each trigger can be in shutoff, plus or minus mode.In the shutoff mode, all crystals pipe has zero grid-source voltage.In positive mode, the electric bridge conducting forms a positive voltage on transformer.In the losing side formula, this voltage is for negative.In this dual mode, n raceway groove and p channel transistor all have only a conducting separately.
Each electric bridge is by near two p channel transistor M1, M3 of main track, M5, M7, and two the n channel transistor M2 near ground wires, M4, M6, M8 and transformers are formed.Transformer comprises a main power source former limit winding and a secondary winding.Also have four auxiliary windings, as the feedback of each trigger.
Auxiliary winding AL1 to AL8 forms centre cap formula winding, and wherein central contact is connected with main track, ground wire respectively.Form winding polarity, so that as the CMOS feedback, work.At least on the electric bridge of former limit, will assist windings in series by the resistor R 1 to R4 of low resistance.
Because grid is to be controlled by the winding on the transformer, so trigger has the characteristic that enters off state when uncontrolled.Gate charge is provided by transformer.
The rated voltage that a 300V arranged of former limit electric bridge between main track and negative wire.Grid-source voltage is-5V, 0V or+5V.Rated current is 0.2A.In order to control grid, the grid in every arm of electric bridge is connected by capacitor.There is the control signal of oneself on each limit.This signal has same waveform with the output signal that is added on the transformer.
The input resistance of the electric capacity between drain electrode and the grid, transistor, gate drivers constitutes an integrator.In order to control trigger, switching loss can not take place again, the impedance of driver must be low, so that always grid-source voltage is remained below threshold voltage at conversion period.
The secondary electric bridge has the rated voltage of a 5V between main track and negative wire.Grid-source voltage is-5V, 0V ,+5V.Rated current 12A.It and former limit electric bridge use driver of the same type.
Transducer is controlled by a state device, and this device has an input that comes self-clock for 10 among Fig. 1, and this clock can be worked under 250KHz.
Oscillator is a free oscillation ring oscillator.Frequency Phase Lock to one external analog clock.The output of oscillator is delayed time about 0.1 to 0.3 cycle, and sends.
By all oscillators being placed to an annular, one of them oscillator is exported to the input of phase locking benchmark, and all oscillators use identical frequency and by phase shift.By the method, the conversion in the different electrical power can be distributed in one-period.Like this, can reduce noise.
The frequency of oscillator is in ± 30%.
This state device can be made of general dynamic D-latch, in this example, uses 30.2 are used for decision state (shutoff, conducting, low, overload), 3 phase places (shutoff, phase place 0, phase place 1, phase place 2) that are used for one of transducer, 1 is used for " counter setting ", and 27 as counter, and it can be arranged to count 2 by " counter setting " position
20Or 2
27, so just produced two different overload condition.
As shown in Figure 2, power supply has plurality of sensors, and they are used for the voltage and current in the measuring bridge.They are the general amplifier that has threshold.Need be with lower sensor:
S1=V control＞9V
S2＝V300＞250V
S3＝V300＞350V
S4＝I300＞1.5A
S5＝I5＞10μA
S6＝V5＞4.5V
S7＝T＞70C
First three voltage can use the static voltage divider on the control unit power supply to measure.The voltage gradient as on the 5V power source bus of back is measured.
Be spaced at secondary side I5 and V5 transducer.Between both sides, used an electric capacity difference coupling.An edge is used for changing the state of transducer.Like this, capacitance signal just is connected directly to the setting of a trigger and the input that resets.This trigger resets when power supply.
As shown in Figure 1, those transducers input to control circuit, and determine the conversion of state according to Fig. 3.
Though it is shown in Figure 1 that state device 10 does not have, in fact controlling one group of voltage transformer, in example two such unit.Fig. 3 is seen in each state and conversion, and S1 to S7 controls by transducer.
The function of control unit is exactly the conversion in the state diagram.Main conversion is as follows:
1. when control unit power supply V control＜9V or 300V power source bus voltage V300＜250V, state is converted to immediately and (cuts off, undef).This is the conversion of using when starting or outage.
2. under conducting state, when 300V power source bus electric current I 300＞1.5A or transducer temperature t emp＞80K, state is converted to (overload 0, counter) immediately.This is the overload detection conversion.
Outside conversion is by the oscillator clock Synchronization Control.
3. under off state, when control unit power supply V control＞9V and 300V power source bus voltage V300＞250V, next state is that (on pho off, 0) this conversion is a start converter after outage.
4. under conducting state, when output current I5＜10 μ A, next state is (low, a counter).This conversion is to be used for cutting off when electric current is very little transducer.Load for the charging capacitor on the 5V bus.
5. under low state, when 5V power source bus voltage V5＜4.5V, next state be (nl pho off, 0), and the capacitor that is recharged discharges, and begins to charge to capacitor.
6. working as state is ((overload 2
20), 0) time, overload is turned off, and is converted into state ((on pho off), 0).
7. working as state is ((overload 2
27), 1) time, overload is eliminated.New state is ((on pho off), 1).
8. when state was ((on ab), 1), the counter of makeing mistakes was cleared.Next state is ((on a b), 0).
As shown in Figure 5, under conducting state, two unit provide voltage separately in work, therefrom can be clear that at any special time, to have at least a unit that 5V voltage can be provided.In order to understand better, the time of will " opening " has here exaggerated excessively.
Each of two unit can change its switching when being in conducting state.Two unit phase places separately are called off, ph0, ph1, ph2, ph3, appear among Fig. 5.The one-period of unit under conducting state comprises a series of phase place, ph0, ph1, ph2, ph3, ph0 ...
As shown in Figure 5, second unit about phase place that lags behind, when starting when off state off becomes conducting state, unit a is from ph0, and unit b still is in off state off, and when unit a was transformed into ph1, unit b switched to ph0.Clearly, the switching of each unit is respectively from ph3 to ph0 with from ph1 to ph2.
In the embodiment that gives an example, used following main electronic component:
C10，C11，C12 100nF
L9，L10 10μH
In each transducer in parallel, used following elements:
C1，C2，C3，C4 10nF
R1，R2，R3，R4 1ohm
M1，M3 pmos
M2，M4 nmos
M5, M7 pmos, special use
M6, M8 nmos, special use
The K1 transistor, special use
These discrete components are mounted on surface flaky electric capacity, chip inductor and printed resistor.All wirings are all on a ceramic chip.
Control unit is an independent integrated circuit.It uses the 10V logic.The transducer of transducer secondary electric bridge and output places an integrated circuit.Former limit electric bridge is made of four independent standard components.
In each transducer, there is one to have the very transformer of particular design.
Former limit electric bridge uses high pressure P raceway groove and N-channel MOS power transistor.The about 5oh ms of conducting resistance.Transistor by between grid and the source electrode-5V, 0V ,+voltage of 5V controls.The normal current of keeping is 0.2A, is possible but peak value is 1.2A.A transistor characteristic typical, that can obtain from the commercial channel is as follows:
N raceway groove P raceway groove
ron＝12ohm 12ohm
V
r＝2.0V -2.0V
C
GS＝125pF 375PF
C
DG＝6PF 18PF
C
DS＝7PF 21PF
I
D＞1.2A -1.2A
V
DS＞400V -400V
△V＝2.4V 2.4V，0.2A
Through transistorized normal current is 0.2A.It can cause resistance drop 2 * 2.4V.Total losses are 0.96W.
V
DG, V
DSAnd V
GSConnect 305V, 300V and 10V respectively, they connect big electric capacity with 175KHz, cause sizable loss, are respectively 1.12W, 1.26W and 25mW.As shown, handoff loss is remarkable.
Yet the secondary electric bridge must be used more low-impedance transistor.They also by between grid and the source electrode-5V, 0V and+the 5V voltage control.Conducting resistance is 5 milliohms, and operating voltage is 5V.
Such transistor can not obtain from the commercial channel.Yet, voltage and size of current be the same in microprocessor chip, so use 0.8 general μ m technology.In order to handle inductance, each transistor comprises four parallel MOS transistor.
The transducer of 5V power bus also is integrated in this chip.The major part of this chip is a power transistor.This chip has four power terminals and two logic terminals.
N raceway groove P raceway groove
ron＝9.3mohm 9.3mohm
V
r＝0.7V -0.7V
C
GS＝575PF 1.7nF
C
DS＝87PF 263PF
C
DG＝87PF 263PF
I
D＞18A -18A
V
DS＞5V -5V
△V＝28mV 28mV，3A
Through the transistor normal current is 4 * 3A.It can cause resistance drop 2 * 28mV.Total losses are 672mW.
V
DG, V
DSAnd V
GSConnect 10V, 5V and 10V respectively.They connect big electric capacity with 175KHz, cause sizable loss, are respectively 17.5mw, 4.4mw and 114mw.As shown, handoff loss is inappreciable.
In the present embodiment, used a kind of special ferrite transformer, it has the winding on plane on polymer sheet, utilizes TAB(Tape Automatic Bonding band from being dynamically connected) technology, these polymer sheets also can carry most of switch electronic parts.Utilize this conception of species, power supply can be done very for a short time, and its energy loss is also little.
Be clear that very that from above secondary electric bridge shown in Figure 1 is actually by four such electric bridges and composes in parallel, and so just output current is separated, a circle winding of four parallel connections of flowing through respectively, each winding is connected with four electronic switch M5 to M8.
Each winding and transformer core are seen Fig. 8, and its limit, Central Plains winding is installed in a slice and has on the polyimide piece 30 two forks, folding, and an opening is all arranged on each fork, and transformer core 31 penetrates from opening.One side of one of those forks is seen Fig. 6.Have one one circle to assist winding in this side, there is one 15 circle spiral winding the inside, and this winding continues to have in addition screw type 15 circles at downside, also by the auxiliary winding of another circle round.Another fork is also similar, has two 15 circle spiral windings, each winding all by an auxiliary winding round.Four former limit windings that respectively are 15 circles are connected, and become one 60 circle winding.Switch M1 to M4 is included in two chip units 32 (Fig. 8).
As shown in Figure 8, four parallel secondary unit 34 also are the TAB unit, and its structure as shown in Figure 7, each all has four auxiliary windings of a secondary winding and outside, in this example, these all windings are all in a side, and each all has the electronic switch M5 to M8 in the chip 35.
The standard RM5 ferrite iron core that transformer is made with the N47 material.The core material loss is low, can work to 1MHz.Material magnetization ± 300mT, loss is 63mw.
The secondary winding is made up of a slice 125 μ m polyimide films, is coated with the copper of 70 μ m in each side.Will be with four duplicate this films.On their blocks of piling up, core center penetrates by a hole in the centre.The 15+1+1+1+1 circle is arranged as former limit winding in a side, opposite side has the 1+1+1+1+1 circle as the secondary winding.All windings place coaxial position mutually.
The external diameter of film is 10.1mm, and internal diameter is 5.0mm.It between them winding.The auxiliary whole wide 0.1mm of winding, main winding is 1.95mm.All separators are 50 μ m.Former limit winding has a conductor width that equals 0.1mm.Because use these fine rules, skin effect is inappreciable.Winding has following characteristic:
Former limit:
4 * 15 circles
Area=70 * 100 μ m, length=1.43m
R＝3.68ohm，Lp＝3.99mH
P＝147mW，△V＝740mV，0.2A
Secondary (4 are parallel):
1 circle
Area=70 * 1950 μ m, length=24.0mm
R＝3.16mohm，Ls＝3nH
P＝50.5mW，△V＝12.6mV，4A
Auxiliary winding (8 are identical):
1 circle
Area=70 * 100 μ m, length=24.0mm
R＝62mohm，Ls＝3nH
The winding film is also as TAB band, installation power transistor.Transformer comprises nine polymer films.Have four 34, be used to export electric bridge, two (30, folding) are used for input bridge and three (33) and are used for insulation (Fig. 8).
The input bridge film has only a slice folded membrane 30.Like this, all winding (60+4 * 1 circle) and institute are leaded, and four power MOS transistors and four resistance all place on this sheet film.Resistance is formed by plate wire.Therefore, this sheet film has only two power terminals and four control terminals.Terminal shape image-tape shape cable is connected on the porcelain control unit substrate.
Two unit that constitute like this are installed in one to have on the main cooling fin 100 that is generally U-shaped, as shown in Figure 9, a complete cell size is 25 * 22 * 20mm, as shown, four teleoseal terminals 51 atop are installed on the ceramic chip 50, carry all discrete components under this substrate, as capacitor C10 to C12 and inductance L 9, L10(Fig. 1) and the control unit chip, as shown in figure 10, this figure is a section X ray picture according to Fig. 9 X-X.Ferrite iron core 31 enters by the hole, is pinned by spring 51 and lid 52, and as shown in figure 11, this figure is a section X ray picture according to Fig. 9 XI-XI.
With Fig. 8 relatively, the chip 32 and 35 that is installed on the polymer film that forms winding is fixed on inner 2 * 6 bars that form of cooling fin separately, and the U-shaped opening is arranged in cooling fin, and with epoxy resin with power transistor as being fixed on the cooling fin 53.Compare with Fig. 8, Figure 11 demonstrates, and former limit bridge switches is called 60, turns to the direction with respect to iron core 31, and secondary also bridge switch then turns to other direction, and each secondary-side switch is connected by flexible cord 62, and these flexible cords are guided the bottom of ceramic chip 50 into.
Like this, the substrate 50 divider D that carries input filter inductance and capacitor, output holding capacitor, 16 capacitors that are used for the secondary control line, two this acc power holding capacitor C13 that are used for control unit and C14, two control unit chips (comprising T1 to R4 and T5 to T8 respectively) in its bottom and be used for former limit control unit.
Main loss is at former limit bridge switches transistor.Under the situation of normal load 60W, efficient is about 93%, and when peak power 360W, loss increases to 73W, and decrease in efficiency to 79.6%.
Normal output resistance is 3.6mohm.This causes when normal load voltage to reduce to 43.2mV.When the 360W peak load, pressure drop is 260mV.
Now illustrated is a Dc low voltage power supply with two " transformers " of working intermittently, and their necessary switching interval never overlaps, and they are worked in tandem.Same principle can be used to arrange any amount of unit.When having only two unit, when not working in another unit, the unit of working not bear double load.Some more in number of unit, and when whenever all having only a unit not work, this means that the extra load of other unit can correspondingly proportional decline.By this arrangement, a voltage is always arranged, when conversion, do not have any rapid drawdown.Need be in capacitor, inductance or similar elements stored energy.
Unless capacitive load is always arranged, preferably arrange a little output capacitance, be used for fixing the storage under the loading condition.Power supply may can be turn-offed by said state device at that time, relative energy consumption can be reduced a lot.
Filter (Fig. 1, L9 to L12, C10 to C12) at input side can bear secondary side even very fast impulse current, so just make power supply avoid disturbing.A 100nF capacitor that is used for 300V has rational size and low stray inductance, then needs one 360 μ F capacitor in the 5V side, and volume can be bigger, has very very large stray inductance, and this makes it can not handle impact such as 20MHz.
Therefore, characteristic of the present invention for example is used for computer for providing the circuit of big electric current highly beneficial under low-voltage.Such device does not need voltage stabilizing usually, and therefore to one or several low-voltage dc power supply power supplies of the present invention, this can be provided by six common pulse rectifiers that are directly connected to a three phase network power supply by the bus of a 300V in suggestion.The ripple of electric network source can exist always, but generally speaking is inessential.In a total system, can provide a battery supply to the 300V bus, to prevent the mains supply fault.In addition, because small size becomes possibility, transducer/commutator transformer of the present invention can avoid using very long low-voltage lead, because can dispose several such unit, only by a 300V bussed supply, this bus is more much smaller than the electronic noise that is produced with some 5V buses long, that carry a few MHz impulse currents.
Claims (26)
1, a kind of low-voltage dc power supply with direct voltage input and dc low-voltage output, it is characterized in that it comprises one group of voltage transformation unit, all there is the terminal that links to each other with each said direct current input and output each said unit, each said unit all comprises a transformer core, its former limit winding (L1) links to each other with said DC input voitage, its secondary winding (L2) links to each other with said VD, and comprise that connects a network, this network comprises gate-controlled switch device (M1 to M4), be used for said DC input voitage under the control of a clock pulse sequence, mode with reverse switches to said former limit winding (L1), and switching device (M5 to M8) with said VD under the control of same clock pulse sequence, mode with reverse switches to said secondary winding (L2), said one group of voltage transformation unit has a common Control Network, so that switch, at a time, when a transformer unit was switching, another transformer unit did not switch at least.
2, a kind of low-voltage dc power supply of claim 1 is characterized in that filter circuit (L9, L10, C10 to C12) is positioned at said direct-flow input end.
3, a kind of low-voltage dc power supply of claim 1, it is characterized in that each said gate-controlled switch device all has a control electrode, link to each other with an end of an auxiliary winding (AL1 to AL8) in the transformer, one in the other end and the lead that constitutes the direct current input and output respectively links to each other.
4, a kind of low-tension supply of claim 1, it is characterized in that said connection network comprises former limit electric bridge with former limit winding (L1) and the secondary electric bridge with secondary winding (L2), each said electric bridge all has four controlled electronic switchs that separate, and each all has a conducting state and nonconducting state.
5, a kind of low-tension supply of claim 4 is characterized in that said switch is a MOS transistor.
6, a kind of low-tension supply of claim 4 is characterized in that said switch is a bipolar transistor.
7, a kind of low-tension supply of claim 4 is characterized in that public Control Network is carried out switching cycle ground, and the turn-on cycle of former limit electric bridge comprises the turn-on cycle of corresponding secondary electric bridge, and the time outside conducting changes, its secondary winding does not load.
8, a kind of low-tension supply of claim 7 is characterized in that the electric bridge switching is subjected to lc circuit control, and this circuit is to be made of transformer inductance and a kind of electric capacity of the electric capacity of material arbitrarily of stray capacitance and whole transformer that comprises.
9, a kind of low-tension supply of claim 1 is characterized in that transformer core is the Ferrite Material iron core, and each winding is made of the flaky material on the thin insulating carrier.
10, a kind of low-tension supply of claim 9 is characterized in that the coil of winding is positioned at the two opposite sides of said carrier.
11, a kind of low-tension supply of claim 10 is characterized in that said former limit winding comprises the spiral conducting line of the opposite side that is positioned at said substrate, and each all has the circumference terminal, and each internal heads of helix interconnects on the thickness of thin carrier.
12, a kind of low-tension supply of claim 9 is characterized in that said thin insulating carrier is a kind of polymer film.
13, a kind of low-tension supply of claim 9 is characterized in that said thin insulating carrier is a kind of porcelain thin slice.
14, a kind of low-tension supply of claim 12 is characterized in that said plastic film folds, so that obtain many layers.
15, a kind of low-tension supply of claim 14 is characterized in that said layer is separated by the short lap of surface insulation.
16, a kind of low-tension supply of claim 1 is characterized in that said Control Network forbids conducting when little load current, by one independently shunt capacitor a spot of Charge Storage is provided.
17, a kind of low-tension supply of claim 4 is characterized in that said public Control Network comprises two disclosed driver-level (T1 to T4; T5 to T8), one-level is used for former limit electric bridge, and another level is used for the secondary electric bridge.
18, a kind of low-tension supply of claim 17 is characterized in that said driver-level links to each other with said electric bridge by electric capacity (C1 to C8).
19, a kind of low-tension supply of claim 17 is characterized in that said driver-level is the transformer that links to each other with said electric bridge.
20, a kind of low-tension supply of claim 17 is characterized in that one and identical transformer are adopted by the said winding of unit.
21, a kind of low-tension supply of claim 17 is characterized in that said transformer is used for electric bridge control and presents electric energy to said driver-level and public Control Network.
22, a kind of low-tension supply of claim 14 is characterized in that the single folded membrane of a slice carries the winding of whole former limits electric bridge.
23, a kind of low-tension supply of claim 22 is characterized in that said gate-controlled switch device (M1 to M8) is installed on a slice ceramic chip.
24, a kind of low-tension supply of claim 23 is characterized in that said ceramic chip contacts with the cooling and absorbing device of outside.
25, a kind of low-tension supply of claim 23 is characterized in that said ceramic chip contacts with the metal capsule.
26, a kind of low-tension supply of claim 1 is characterized in that whole said unit all install concentratedly in a machine assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101254 CN1064573A (en) | 1992-02-29 | 1992-02-29 | Low-voltage dc power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101254 CN1064573A (en) | 1992-02-29 | 1992-02-29 | Low-voltage dc power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1064573A true CN1064573A (en) | 1992-09-16 |
Family
ID=4939025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92101254 Pending CN1064573A (en) | 1992-02-29 | 1992-02-29 | Low-voltage dc power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1064573A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066978A (en) * | 2015-04-24 | 2016-11-02 | 瑞尼斯股份有限公司 | There is coil drive IC being connected to the floating circuit of the lead-out terminal of coil |
| CN110369831A (en) * | 2019-07-24 | 2019-10-25 | 成都振中科技有限公司 | Study of digital welding machine control system and method |
-
1992
- 1992-02-29 CN CN 92101254 patent/CN1064573A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106066978A (en) * | 2015-04-24 | 2016-11-02 | 瑞尼斯股份有限公司 | There is coil drive IC being connected to the floating circuit of the lead-out terminal of coil |
| CN110369831A (en) * | 2019-07-24 | 2019-10-25 | 成都振中科技有限公司 | Study of digital welding machine control system and method |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |