CN101242147B - Multi-output power supply - Google Patents

Abstract

The invention discloses a multi-output power supply, which comprises a transformer with at least two output paths, a power supply control module and a voltage detection comparison module, wherein the at least two output paths comprise a main output path and an auxiliary output path; the transformer comprises a detection winding connected with one input end of the voltage detection comparison module and output circuit windings connected in series on at least two output circuits. The circuit of the invention is extremely simple, and complex circuits such as a reference source, a comparator and the like are not needed, and devices which bring loss such as a resistor and the like are not needed. The invention can not only simultaneously carry out overcurrent or short-circuit protection on the multipath output, but also simultaneously carry out overcurrent protection on the main output circuit and all the auxiliary output circuits.

Description

A kind of multiple-output electric power

Technical field

The present invention relates to a kind of power circuit, be specifically related to a kind of multiple-output electric power.

Background technology

At present, in the industry cycle in the multiple-output electric power of Ying Yonging, main output road is for having degenerative output road, relative performance is stable, the precision of voltage regulation is higher, with the auxilliary output road poor-performing of feedback, the precision of voltage regulation is not high yet for all the other, so generally electric current maximum or the highest output road of importance are exported as main output road.Remaining little electric current output road is as auxilliary output road.And industry is also more and more regular to the requirement of safety at present; multiple-output electric power every road output generally all will be transshipped; tests such as short circuit; because many auxilliary outputs road output rated current is less; the winding wire of its corresponding Transformer Winding is generally also thinner; the line resistance can be bigger; add that its output loop PCB cabling is generally also thinner; also can be bigger with the line-transect resistance; add other line that may exist resistance; maximum short circuit current has only several amperes sometimes even less than 1A in the time of may causing the output loop short circuit; when main output road load for the underloading input voltage when the highest; the load capacity deficiency that it increased makes duty ratio be transferred to maximum; therefore can't make former limit carry out current-limiting protection; or adopt certain road output voltage detection method to protect; this just may cause the transformer temperature to surpass its corresponding insulation class requirement, and what have then may cause the PCB cabling overheated for a long time, causes PCB or near its other anti-flammability not high device or material on fire.The method that also can adopt the output of every road to carry out over-current detection is certainly protected, but this protective circuit complexity, cost is high, may all will isolate with the PWM control loop on every road.This method also will be with amplifier or comparator except wanting a reference source, and amplifier or comparator are higher than the independent power supply of this road output possibly; Sample resistance has power consumption, influences the load regulation of this road output; To use light-coupled isolation; PWM control limit also wants corresponding comparison control circuit to carry out locked protection or the protection of having the hiccups.Particularly when output way more every road electric current is all little, this method can cause PCB area, small product size excessive, and cost increases and too much waits undesirable element, generally is not used.

Existing a kind of typical output short-circuit (or overcurrent) protection lock dead circuit as shown in Figure 1; R2 among Fig. 1, R3, R6 and U5 form benchmark; R1 is a current sampling resistor; C5 is the current signal filter capacitor; U4 is an operational amplifier; U3 is for isolating optocoupler, and R10, R11, C4, Q1, D1, U2 are the voltage detecting comparison circuit.Under the normal condition, the Q1 current collection is high level very; When the detection output loop produces overcurrent or short trouble, the R1 voltage rise height that powers on, the 2 pin voltages of amplifier U4 are greater than 3 pin voltages, and 1 pin of output is a low level, optocoupler U3 former limit conducting, its secondary produces corresponding electric current and makes the resistance R 10 voltage rise height that powers on, the 3 pin voltages of amplifier U2 are greater than 2 pin voltages, and its output pin 1 is exported high level, Q1 conducting, the COMP pin of energy supply control module is dragged down, the PWM no-output; Simultaneously because U2 amplifier pin one output high level is locked as high level by the D1 diode with 3 pin of amplifier U2, so Q1 remains conducting state, PWM is locked.Need the shutdown pending fault to get rid of back reopening machine, latch-release, power supply is operate as normal again.

From above-mentioned analysis situation to typical short circuit (or overcurrent) protective circuit as can be known, the short circuit of existing multiple-output electric power (or overcurrent) protective circuit has following defective:

Circuit is complicated, and cost is higher, and reliability is relatively poor; Particularly when temperature range broadened, higher to the requirement of optocoupler and a reference source chip, cost also can increase.

Adopt resistance or current transformer sampling current, when using resistance sampling, can lower efficiency and increase thermal losses, directly have influence on this road output precision of voltage regulation because load current changes simultaneously; When exporting way more for a long time, no matter every road is that cost or circuit complexity can significantly increase if being detected.

When needs detect and the output loop voltage of protection when low, not enoughly be amplifier (the as above U4 among the figure) when normal power source is provided, also will be amplifier specialized designs one road power supply, or select the respective chip of low-tension supply for use, but cost can increase.

When we adopt a road auxilliary output road output voltage that detects multichannel output to protect; owing to may have the less output of electric current road in the middle of other auxilliary output road; maximum when short circuit or overcurrent owing to existing bigger line resistance and internal resistance etc. to cause output overcurrent or short circuit current deficiency that the duty ratio of power supply is arrived; and can't or there be safety problem in transformer by safety because of this winding temperature is too high, or the overheated existence that causes other safety problem of PCB cabling.

When the input voltage range broad, the duty ratio of the duty ratio of minimum all the output full loads of input voltage when one tunnel output is in overcurrent or other output road of short circuit attitude and is in underloading when higher greater than input voltage adopts the method for voltage detecting just can not correctly detect output overcurrent or short trouble.

For adopting the circuit that certain road method for detecting output voltage is carried out overcurrent protection, when stream is passed by in detection, just can't detect the over current fault on this road.

Summary of the invention

The present invention is exactly in order to overcome above deficiency, to provide a kind of circuit structure simple multiple-output electric power.

Technical problem of the present invention is solved by following technical scheme:

A kind of multiple-output electric power, comprise transformer, energy supply control module, voltage detecting comparison module and switching tube with at least two output roads, described at least two output roads comprise main output road and auxilliary output road, the output of described energy supply control module links to each other with the input of transformer by switching tube, and the output of described voltage detecting comparison module links to each other with the input of energy supply control module; Also comprise instrument transformer, described instrument transformer comprises detecting winding and being connected at least two exports the road windings; Be unity couping between the winding of described instrument transformer; One end ground connection of described detection winding, the other end of described detection winding links to each other with an input of described voltage detecting comparison module, and another input of described voltage detecting comparison module receives reference voltage signal; The number of described output road winding is smaller or equal to the number on the output road of described transformer, and described each output road winding is connected on respectively on the output road.

Technical problem of the present invention is further solved by following technical scheme:

Described output road winding comprises being connected on first winding on the first auxilliary output road and being connected on second assists second winding of exporting on the road, the electric current of described first winding and detection winding flows into end end of the same name each other, and described second winding is held different name end each other with the electric current inflow that detects winding.

Described multiple-output electric power satisfies: And/or

Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being output overcurrent on the described first auxilliary output road, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being the described second auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, Ds is the duty ratio that described switching tube when flowing is passed by in the first auxilliary output, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, the variable quantity of electric current on the corresponding Transformer Winding in the first auxilliary output road when variable quantity of electric current on the Transformer Winding of second auxilliary output road correspondence when Δ ILs2 is the first auxilliary output road output overcurrent, Δ ILs1 are the second auxilliary output road output overcurrent.

Described output road winding comprises being connected on first winding on the first auxilliary output road and being connected on second assists second winding of exporting on the road, the electric current of described first winding and described second winding flows into end end of the same name each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

Described multiple-output electric power satisfies:

And/or

Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being the described first auxilliary output road output overcurrent, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being the described second auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, the variable quantity of electric current on the corresponding Transformer Winding in the first auxilliary output road when variable quantity of electric current on the Transformer Winding of second auxilliary output road correspondence when Δ ILs2 is the first auxilliary output road output overcurrent, Δ ILs1 are the second auxilliary output road output overcurrent.

Described output road winding comprises first winding that is connected on the first auxilliary output road, be connected on second winding on the second auxilliary output road and be connected on the tertiary winding on the 3rd auxilliary output road, the electric current of described first winding and described second winding flows into end end of the same name each other, the electric current of described first winding and the described tertiary winding flows into holds different name end each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

Described output road winding comprises first winding that is connected on the main output road, is connected on second winding on the auxilliary output road, the electric current of described first winding and described second winding flows into end end of the same name each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

Described multiple-output electric power satisfies:

And/or Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being described main output road output overcurrent, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being described auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, Δ ILs2 is the variable quantity that electric current on the Transformer Winding of auxilliary output road correspondence is flow through in main output when passing by stream, Δ ILs1 be auxilliary output when passing by stream the master export the variable quantity of electric current on the Transformer Winding of road correspondence.

Described output road winding comprises first winding that is connected on the main output road, is connected on second winding on the auxilliary output road, the electric current of described first winding and detection winding flows into holds different name end each other, and the electric current of described second winding and detection winding flows into holds end of the same name each other.

Be provided with rectification filtering module between described detection winding and the voltage detecting comparison module.

Described multiple-output electric power is inverse-excitation type or positive activation type or buck or boost type or step-down/up type or push-pull type or semibridge system or full-bridge type topology.

The beneficial effect that the present invention is compared with the prior art is:

Circuit of the present invention is extremely simple, without complicated circuits such as a reference source, comparators, need not add the device that resistance etc. can bring loss.

The present invention can export multichannel simultaneously and carry out overcurrent or short-circuit protection, also can assist main output road and all simultaneously and export roads output carrying out overcurrent protection.

The present invention can carry out directed overcurrent or short-circuit protection to little electric current output loop.

The present invention can quantize design to the over-current protection point of difference output.

The present invention's directed voltage regulation function or carry out the semi-directional voltage regulation function between main output road and auxilliary output road between overcurrent protection has auxilliary output road simultaneously, the pressure regulation amount is changeable between each output, can specifically quantize to design.

The present invention can also improve the electromagnetic compatibility characteristic on relevant output road.

At present also occur detecting multiple signals simultaneously with an instrument transformer, reason is exactly when there is a plurality of driving source in the different windings of an instrument transformer, the magnetic field that these driving sources produce in magnetic core can influence each other, the signal of being taken a sample only may be the signal behind the combined influence, because these signal frequencies are close or identical, can not decompose each signal, very covered fully to the signal that has, and the present invention utilizes this principle just, by the turn ratio of control instrument transformer and the polarity of each winding, the proportion of controlling in the signal of each winding signal behind combined influence is realized corresponding function.

Description of drawings

Fig. 1 is the circuit diagram of prior art;

Fig. 2 is the circuit diagram of the specific embodiment of the invention one;

Fig. 2 is the circuit diagram of the specific embodiment of the invention one;

Fig. 3 a, 3b, 3c are the schematic diagrames that concerns of three road output voltages of the specific embodiment of the invention one and duty ratio;

Fig. 4 is the circuit diagram of the specific embodiment of the invention two;

Fig. 5 is the circuit diagram of the specific embodiment of the invention three;

Fig. 6 is the circuit diagram of second kind of distortion of the specific embodiment of the invention four;

Fig. 7 a, 7b, 7c are the schematic diagrames that concerns of three road output voltages of the specific embodiment of the invention four and duty ratio;

Fig. 8 is the circuit diagram of the specific embodiment of the invention five;

Fig. 9 is the circuit diagram of the specific embodiment of the invention six;

Figure 10 is the circuit diagram of the specific embodiment of the invention seven;

Figure 11 is the circuit diagram of the specific embodiment of the invention eight;

Figure 12 is the circuit diagram of the specific embodiment of the invention nine;

Figure 13 is the circuit diagram of the specific embodiment of the invention ten;

Figure 14 is the circuit diagram of the specific embodiment of the invention 11.

Embodiment

The auxilliary output road output that multiple-output electric power of the present invention not be used in the possibility overcurrent adds a reference source, amplifier or comparator, sample resistance; only carry out a winding of an over-current detection instrument transformer of output loop series connection access of overcurrent protection at needs; by detecting a coupled voltages that detects on the winding of instrument transformer; when the reference voltage of coupled voltages above the voltage detecting comparison module, the voltage detecting comparison module just passes through the energy supply control module output low level with the protection multiple-output electric power.The characteristics of this protective circuit are that both but the test section output loop also can detect overcurrent or the short circuit that comprises whole output circuits of leading the output road; simultaneously overcome the defective that can't carry out overcurrent or short-circuit protection to little electric current output loop again, it can carry out quantitative overcurrent protection to the concrete output loop in each road.For the protection of the output overcurrent between multichannel, orientation between the present invention can also export or non-directional voltage regulation function.Below we illustrate this directional overcurrent protection principle according to embodiment.

Embodiment one

Multiple-output electric power as shown in Figure 2 comprises transformer T1, voltage detecting comparison module 2, energy supply control module 3.Described transformer T1 has four windings, is respectively the first former limit winding T1a, the second former limit winding T1b, the first secondary winding T1c and the second secondary winding T1d.Wherein the first former limit winding T1a is corresponding to the input of transformer T1, and the second former limit winding T1b, the first secondary winding T1c and the second secondary winding T1d are respectively Vo1 road, Vo2 and Vo3 road corresponding to three output roads of transformer T1.Wherein Vo1 road, Vo2 road are auxilliary output road, also are the output roads that we will carry out overcurrent or short-circuit protection simultaneously, and the Vo3 road is Third Road output, can be that main output road also can be other auxilliary output road.

The auxilliary instrument transformer of exporting one two winding of adding of connecting in the output loop before the rectifying and wave-filtering between the road of two-way that we carry out overcurrent protection at needs; two windings of instrument transformer are connected on respectively in two output loops; the first winding L 1a that is instrument transformer is connected on the first auxilliary output road (Vo1 road), and the second winding L 1b is connected on the second auxilliary output road (Vo2 road).The electric current of the first winding L 1a and the second winding L 1b flows into holds different name end each other, and promptly the flow direction that produces in transformer core of two-way electric current is opposite, and magnetic flux subtracts each other.

Instrument transformer also comprises detection winding L 1c, described voltage detecting comparison module 2 is connected and detects between winding L 1c and the energy supply control module 3, the electric current of described detection winding L 1c flows into end and holds different name end each other with the electric current inflow of the second winding L 1b, with the electric current inflow end end of the same name each other of the first winding L 1a.

Under the preferable case, detect between winding L 1c and the voltage detecting comparison module 2 and can be provided with rectification filtering module 4.Described rectification filtering module 4 comprises the 5th diode D5 and the 5th capacitor C 5, the anode of described the 5th diode D5 links to each other with detection winding L 1c, negative electrode links to each other with an input of voltage detecting comparison module 2, described the 5th capacitor C 5 one ends link to each other with the negative electrode of the 5th diode D5, and the other end links to each other with ground.Obviously, rectification filtering module 4 also can adopt other forms of circuit.

Described energy supply control module 3 links to each other with the first former limit winding T1a by switching tube Q1, and the pulse of energy supply control module 3 output turnable pulse widths is to switching tube Q1.Described energy supply control module 3 preferred pwm chips.

The present invention is by detecting the overcurrent condition that winding L 1c detects these two the auxilliary output road output of Vo1 road and Vo2 road; reach overcurrent protection action threshold voltage when detecting the integrated voltage that is coupled on the winding L 1c; voltage detecting comparison module 2 just outputs signal to energy supply control module 3; energy supply control module 3 output low levels are to switching tube Q1; thereby lock the input of described transformer, so just can satisfy the purpose of overcurrent protection.

Shown in Fig. 3 a, 3b, 3c, below we come the operation principle of the above-mentioned multiple-output electric power of labor:

We analyze directed voltage regulation function between Vo1 road and the output of Vo2 road earlier.The number of turn of supposing the first winding L 1a is Na, and the voltage on the first winding L 1a is VL1a; The number of turn of the second winding L 1b is Nb, and the voltage on the second winding L 1b is VL1b; The number of turn that detects winding L 1c is Nc, and the voltage that detects on the winding L 1c is VL1c; The inductance coefficent of L1 transformer core is AL.Instrument transformer respectively around for unity couping be coefficient of mutual inductance

D is a switching tube Q1 conducting duty ratio, for convenience of description, we have ignored the diode forward conduction voltage drop in calculating below, the number of turn of the first former limit winding T1a of transformer T1 is NP, corresponding secondary each umber of turn should be NS1, NS2, NS3 mutually, and VIN is the input direct voltage of the transformer first former limit winding T1a.Below the output voltage of two-way is analyzed.

The output voltage on Vo1 road and this two-way of Vo2 road is respectively before the instrument transformer pressure regulation to not adding:

Vo1old＝(ULs1-VD1)(1-Ds)＝ULs1*(1-Ds)

Vo2old＝(ULs2-VD2)(1-Ds)＝ULs2*(1-Ds)，

Wherein, Vo1old is not for adding the output voltage on Vo1 road before the instrument transformer, ULs1 exports the voltage at corresponding Transformer Winding T1b two ends for the Vo1 road, VD1 is Vo1 road output rectifier diode D3 forward conduction voltage drop, Vo2old is not for adding the output voltage on Vo2 road before the instrument transformer, ULs2 exports the voltage at corresponding Transformer Winding T1d two ends for the Vo2 road, and VD2 is Vo2 road output rectifier diode D2 forward conduction voltage drop.

Suppose primary feedback output road open loop after adding the instrument transformer pressure regulation, then the output voltage of Vo1 road and this two-way of Vo2 road is respectively:

$\mathrm{<figure-callout\; id="1"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">Vo</figure-callout>}1=(\mathrm{ULs}1-\mathrm{VL}1a)(1-\mathrm{Ds})$

$=(\mathrm{ULs}1-\mathrm{AL}\&times;{\mathrm{<figure-callout\; id="2"\; label="Na"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Na</figure-callout>}}^2\frac{\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}}+\mathrm{AL}\&times;\mathrm{Na}\&times;\mathrm{Nb}\&times;\frac{\mathrm{<figure-callout\; id="2"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">dILs</figure-callout>}2}{\mathrm{dt}})(1-\mathrm{Ds})$

$\&ap;\mathrm{ULs}1(1-\mathrm{Ds})+\mathrm{AL}\&times;\mathrm{Na}(\mathrm{Nb}\&times;\mathrm{\&Delta;ILs}2-\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)$

$\mathrm{<figure-callout\; id="2"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Vo</figure-callout>}2=(\mathrm{ULs}2-\mathrm{<figure-callout\; id="1b"\; label="VL"\; filenames="H07101900820070305E000062.png"\; state="\{\{state\}\}">VL</figure-callout>}1b)(1-\mathrm{Ds})$

$=(\mathrm{ULs}2-\mathrm{AL}\&times;{\mathrm{<figure-callout\; id="2"\; label="Nb"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Nb</figure-callout>}}^2\frac{\mathrm{<figure-callout\; id="2"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">dILs</figure-callout>}2}{\mathrm{dt}}+\mathrm{AL}\&times;\mathrm{Na}\&times;\mathrm{Nb}\&times;\frac{\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}})(1-\mathrm{Ds})$

$\&ap;\mathrm{ULs}2(1-\mathrm{Ds})+\mathrm{AL}\&times;\mathrm{Nb}(\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1-\mathrm{Nb}\&times;\mathrm{\&Delta;ILs}2)$

Wherein, Vo1 adds the instrument transformer output voltage on Vo1 road afterwards, VL1a is the voltage at the instrument transformer first winding L 1a two ends, ILs1 exports the electric current that corresponding Transformer Winding T1b flows through for the Vo1 road, Δ ILs1 exports the current change quantity that corresponding Transformer Winding T1b flows through for the Vo1 road, ILs2 exports the electric current that corresponding Transformer Winding T1d flows through for the Vo2 road, Δ ILs2 exports the current change quantity that corresponding Transformer Winding flows through for the Vo2 road, Vo2 adds the instrument transformer output voltage on Vo2 road afterwards, and VL1b is the voltage at the instrument transformer second winding L 1b two ends.

When not needing to carry out directed pressure regulation between Vo1, Vo2 road output voltage, to adding instrument transformer design by following (1), that is:

Nb×ΔILs2-Na×ΔILs1＝0 (1)

In this case, Vo1, Vo2 road output voltage remain unchanged substantially behind the adding instrument transformer.

Also can determine that (1) is greater than zero or less than zero or equal zero on earth according to the relation of actual Vo1 road, Vo2 road output voltage and rated value.As Vo2 road output voltage when higher than rated value, we just allow (1) formula for greater than zero, at this moment, add instrument transformer after, Vo1 road voltage raises, Vo2 road output voltage descends, and reaches a kind of pressure regulation purpose.Output voltage is on the low side when the Vo2 road, when Vo1 road output voltage is higher, can be by the directed compensation Vo2 road output of Vo1 road, and making (1) formula is less than zero, Vo2 road voltage raises.As seen, this current foldback circuit has directed voltage regulation function simultaneously.In addition owing to Vo1, Vo2 road variable quantity and independent of duty cycle, so do not influence Vo3 road output voltage.

Below we analyze the output voltage on the detection winding L 1c of instrument transformer:

$\mathrm{Vi}=(\frac{\mathrm{Mcb}\&times;\mathrm{<figure-callout\; id="2"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">dILs</figure-callout>}2}{\mathrm{dt}}-\frac{\mathrm{Mac}\&times;\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}})(1-\mathrm{Ds})$

$=(\mathrm{AL}\&times;\mathrm{Nb}\&times;\mathrm{Nc}\&times;\frac{\mathrm{<figure-callout\; id="2"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">dILs</figure-callout>}2}{\mathrm{dt}}-\mathrm{AL}\&times;\mathrm{Na}\&times;\mathrm{Nc}\&times;\frac{\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}})(1-\mathrm{Ds})---\left(2\right)$

$\&ap;\mathrm{AL}\&times;\mathrm{Nc}(\mathrm{Nb}\&times;\mathrm{\&Delta;ILs}2-\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)$

Below we analyze the overcurrent protection principle; when supposing when Vo2 road output current surpasses certain set point, just need protect; the electric current that corresponding Vo2 road at this moment output current is converted the transformer corresponding windings is Δ ILs2o; the electric current that Δ ILs2o certainty is converted the transformer corresponding windings greater than Vo2 road output-current rating is Δ ILs2, i.e. Δ ILs2o＞Δ ILs2.When the output overcurrent of Vo2 road, we can make their Nb* Δ ILs2o＞Na* Δ ILs1 that satisfies condition by the turn ratio between control Nb and Na.At this moment L1a and L1b winding can equivalence be a winding, just are equivalent to a transformer of coupling in the same way between this equivalent winding and L1c, and be similar with the positive activation type topology.At this moment, if when the Vi value reaches the locked circuit operation threshold voltage of overcurrent protection, the output of PWM chip is turned off and is locked.Operation condition corresponding to circuit shown in Figure 3 is:

Vi 〉=VREF, wherein VREF is the reference voltage of described another input of voltage detecting comparison module,

With following formula substitution (2) formula, can draw Vo2 road output current overcurrent point value and be:

$\mathrm{\&Delta;ILs}2o\&GreaterEqual;\frac{\mathrm{VREF}}{\mathrm{AL}\&times;\mathrm{Nc}\&times;\mathrm{Nb}}+\frac{\mathrm{Na}\&times;\mathrm{\&Delta;<figure-callout\; id="1"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">ILs</figure-callout>}1}{\mathrm{Nb}}---\left(3\right)$

Each umber of turn that just can design required adding inductance according to (3) concerns, needs in conjunction with pressure regulation, designs the instrument transformer that will add.

In like manner; in the time of when Vo1 road output current surpasses certain set point, need protecting; we will guarantee Nb* Δ ILs2＜Na* Δ ILs1o; at this moment L1a and L1b winding can equivalence be a winding; just be equivalent to the transformer of a reverse coupled between this equivalent winding and L1c, similar with the inverse-excitation type topology.At this moment, if when the Vi value reaches the locked circuit operation threshold voltage of overcurrent protection, the output of PWM chip is turned off and is locked.Operation condition corresponding to circuit shown in Figure 3 is:

Vi≥VREF

Corresponding (2) formula becomes:

$\mathrm{Vi}=\frac{\mathrm{AL}\&times;{\mathrm{Nc}}^2(\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1o-\mathrm{Nb}\&times;\mathrm{\&Delta;ILs}2)}{\mathrm{Ds}\&times;\mathrm{Na}}(1-\mathrm{Ds})---\left(4\right)$

Can go out Vo1 road output current overcurrent point value equally as calculated is:

$\mathrm{\&Delta;ILs}1o\&GreaterEqual;\frac{\mathrm{VREF}\&times;\mathrm{Ds}}{\mathrm{AL}\&times;{\mathrm{Nc}}^2(1-\mathrm{Ds})}+\frac{\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2}{\mathrm{Na}}---\left(5\right)$

We have just finished this current foldback circuit with the directed pressure regulation of step-down/up type like this.

Embodiment two

As shown in Figure 4, this embodiment is with the difference of embodiment one: the multiple-output electric power of this embodiment is the multiple-output electric power of the directed pressure regulation of a kind of buck.The electric current of the first winding L 1a and the second winding L 1b flows into end end of the same name each other, and promptly the flow direction that produces in transformer core of two-way electric current is identical, the magnetic flux addition.The electric current that detects winding L 1c flows into end and holds different name end each other with the electric current inflow of the first winding L 1a and the second winding L 1b.

After adding instrument transformer L1, Vo1, Vo2 road output voltage and Vi voltage are respectively:

Vo1＝ULs1(1-Ds)-AL×Na(Nb×ΔILs2+Na×ΔILs1)

Vo2＝ULs2(1-Ds)-AL×Nb(Na×ΔILs1+Nb×ΔILs2)

Vi＝AL×Nc(Nb×ΔILs2+Na×ΔILs1)

Vo1, Vo2 road output voltage have all descended as can be known from following formula.Can draw Vo1, Vo2 road output overcurrent point value respectively according to Vi magnitude of voltage and the locked action threshold voltage relation of overcurrent protection simultaneously:

$\mathrm{\&Delta;ILs}1o\&GreaterEqual;\frac{\mathrm{VREF}}{\mathrm{AL}\&times;\mathrm{Nc}}-\frac{\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2}{\mathrm{Na}}$

$\mathrm{\&Delta;ILs}2o\&GreaterEqual;\frac{\mathrm{VREF}}{\mathrm{AL}\&times;\mathrm{Nc}}-\frac{\mathrm{Na}\&times;\mathrm{\&Delta;<figure-callout\; id="1"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">ILs</figure-callout>}1}{\mathrm{Nb}}$

This overcurrent protection mode with directed step-down also can be used in two-way or above auxilliary output road output overcurrent of two-way or the short-circuit protection, and its design and calculation method is identical with the front.

Obviously, the electric current that the detects winding L 1c electric current that flows into end and the first winding L 1a and the second winding L 1b flow into end also can end of the same name each other.At this moment, the anode of the 5th diode links to each other with voltage detecting comparison module 2 with the 5th electric capacity, and the negative electrode of the 5th diode links to each other with detection winding L 1C.Corresponding analytical method and inverse-excitation type are similar.Here do not make labor.

Embodiment three

As shown in Figure 5, this embodiment is with the difference of embodiment one:

This embodiment has been set up the instrument transformer of one four winding, described instrument transformer comprises the first winding L 1a, the second winding L 1b, detects winding L 1c and tertiary winding L1d, wherein the first winding L 1a of instrument transformer is connected on the first auxilliary output road (Vo1 road), the second winding L 1b is connected on the second auxilliary output road (Vo2 road), and tertiary winding L1d is connected on the 3rd auxilliary output road (Vo3 road).

Obviously, utilize technical thought of the present invention also can carry out directed pressure regulation and carry out overcurrent or short-circuit protection simultaneously auxilliary output road output more than three tunnel.

Embodiment four

As shown in Figure 6, this embodiment is with the difference of embodiment one:

This embodiment is carried out over-current detection simultaneously to main output road and auxilliary output road, can realize the overcurrent on main output road and the auxilliary output of part road or short-circuit detecting like this or realizes assisting the semi-directional voltage regulation function of exporting output voltage between the road to the overcurrent on main output road and whole auxilliary output roads or short-circuit detecting the time.We are that example describes with the inverse-excitation type multiple-output electric power of four tunnel outputs shown in Figure 6.

It is higher that we suppose to export road Vo2 voltage, Vo3 road and Vo4 road voltage are on the low side, we add an instrument transformer before the rectifying and wave-filtering between the main output road Vo1 of Vo2 road and band feedback now, wherein the first winding L 1a of instrument transformer is connected on main output road (Vo1) road, and the second winding L 1b is connected on auxilliary output road (Vo2) road.The electric current of the first winding L 1a and the second winding L 1b flows into end end of the same name each other, and promptly the flow direction that produces in transformer core of two winding currents is identical, the magnetic flux addition.The detection winding L 1c of instrument transformer links to each other with voltage detecting comparison module 2.

The number of turn of supposing the first winding L 1a is Na, and the voltage on the first winding L 1a is VL1a; The number of turn of the second winding L 1b is Nb, and the voltage on the second winding L 1b is VL1b; The voltage that detects on the winding L 1c is VL1c; The inductance coefficent of the magnetic core of instrument transformer L1 is AL.Be unity couping between each winding of first, second and third winding, as the coefficient of mutual inductance of L1a, L1b Other roughly the same.D is former limit switching tube conducting duty ratio, and for convenience of description, we have ignored the diode forward conduction voltage drop in calculating below.The number of turn of the corresponding former limit of transformer winding is NP, and corresponding secondary each umber of turn should be NS1, NS2, NS3, NS4 mutually, and VIN is the former limit of a transformer input direct voltage.

Shown in Fig. 7 a, 7b, 7c, below the output voltage of two-way is analyzed.We analyze the semi-directional voltage-regulation principle earlier.After main output road adds the first winding L 1a, because the electric current of the first winding L 1a and the second winding L 1b flows into end end of the same name each other, main output road voltage has downward trend, because there is negative feedback in main output road, this just must cause duty ratio to be raised, main output road keeps stable, and the output of Vo2 road may rise and may fall, and auxilliary output road, other road output voltage rises.Be concrete analysis below:

Output voltage to two-way before the coilloading pressure regulation not is respectively:

Vo1＝(ULs1-VD1)(1-Ds)＝ULs1*(1-Ds)

Vo2＝(ULs2-VD2)(1-Ds)＝ULs2*(1-Ds)

To supposing primary feedback output road open loop after the coilloading pressure regulation, then the output voltage of two-way is respectively:

Vo1′＝(ULs1-VL1a)(1-Ds)≈ULs1(1-Ds)-AL×Na(Nb×ΔILs2+Na×ΔILs1)

Vo2′＝(ULs2-VL1b)(1-Ds)≈ULs2(1-Ds)-AL×Nb(Na×ΔILs1+Nb×ΔILs2)

As can be known, export in the road for Vo1, Vo2 during open loop from top formula, output voltage all descends.And primary feedback output road Vo1 is a closed loop during operate as normal, for keeping the stable of this road output voltage, and when main output road voltage descends, the conducting duty ratio of regulating former limit switching tube by feedback loop.

The duty ratio that can make new advances is:

Wherein, Dn is new duty ratio, and NP is the number of turn of the corresponding first former limit winding T1a of transformer; NS1 exports the number of turn of corresponding Transformer Winding T1b for the Vo1 road; VIN is the input direct voltage of the transformer first former limit winding.

Corresponding new duty ratio, except that the Vo1 output voltage was constant, the voltage of all the other each road outputs was respectively:

${\mathrm{<figure-callout\; id="2"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Vo</figure-callout>}2}^{\&prime;\&prime;}=\mathrm{<figure-callout\; id="2"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Vo</figure-callout>}2+\frac{(\mathrm{<figure-callout\; id="2"\; label="NS"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">NS</figure-callout>}2\&times;\mathrm{Na}-\mathrm{<figure-callout\; id="1"\; label="NS"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">NS</figure-callout>}1\&times;\mathrm{Nb})\&times;\mathrm{AL}(\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2+\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)}{\mathrm{NS}1}$

${\mathrm{<figure-callout\; id="3"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">Vo</figure-callout>}3}^{\&prime;\&prime;}=\mathrm{<figure-callout\; id="3"\; label="Vo"\; filenames="H07101900820070305E000011.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">Vo</figure-callout>}3+\frac{\mathrm{<figure-callout\; id="3"\; label="NS"\; filenames="H07101900820070305E000011.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">NS</figure-callout>}3\&times;\mathrm{AL}\&times;\mathrm{Na}(\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2+\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)}{\mathrm{NS}1}$

${\mathrm{<figure-callout\; id="4"\; label="Vo"\; filenames="H07101900820070305E000032.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">Vo</figure-callout>}4}^{\&prime;\&prime;}=\mathrm{<figure-callout\; id="4"\; label="Vo"\; filenames="H07101900820070305E000032.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">Vo</figure-callout>}4+\frac{\mathrm{<figure-callout\; id="4"\; label="NS"\; filenames="H07101900820070305E000032.png,H07101900820070305E000041.png"\; state="\{\{state\}\}">NS</figure-callout>}4\&times;\mathrm{AL}\&times;\mathrm{Na}(\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2+\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)}{\mathrm{NS}1}$

From following formula as can be known, Vo3, Vo4 road output voltage rise, and have promptly obtained compensation.And the corresponding Transformer Winding number of turn of Vo2 output voltage and Vo2 and Vo1 is relevant with institute's coilloading umber of turn, promptly just can reach Vo2 road output voltage during NS2*Na＜NS1*Nb and descend, and has so just reached the purpose to Vo2 road output voltage orientation adjustment.Just according to

Come designing institute to insert inductance and just can realize above-mentioned semi-directional pressure regulation purpose, owing to NS1 and NS2 determine, so condition is attainable.

Equally, for all auxilliary output road voltages all than under the rated value situation on the low side, as long as the ratio that the corresponding Transformer Winding number of turn is exported on the inductance number of turn that one tunnel auxilliary output road output series connection therein adds and this road during greater than the ratio of the inductance umber of turn that adds in the output series connection of main output road and the corresponding Transformer Winding number of turn in main output road (as the second the tunnel and the first via between the coilloading pressure regulation to satisfy

Get final product), then can realize the purpose that all output voltages all raise, be equivalent to top Vo2 " formula in, NS2*Na-NS1*Nb is being for just, Vo2 " voltage be greater than not adding voltage Vo2's before the inductance.

Equally also can be used for exporting under all higher situation, a winding that each series connection before each output winding rectifying and wave-filtering is added an inductor, the end of the same name of each output loop sense of current and corresponding inductance winding is identical to be that the flow direction that produces in transformer core of each output loop electric current is identical, just can realize purposes that all auxilliary output road output voltages descend.

Below we analyze the output voltage that detects winding L 1c:

$\mathrm{Vi}=(\frac{\mathrm{Mcb}\&times;\mathrm{<figure-callout\; id="2"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">dILs</figure-callout>}2}{\mathrm{dt}}+\frac{\mathrm{Mac}\&times;\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}})(1-\mathrm{Dn})$

$=(\mathrm{AL}\&times;\mathrm{Nb}\&times;\mathrm{<figure-callout\; id="2"\; label="Nc\; dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">Nc</figure-callout>}\frac{\mathrm{dILs}}{}\frac{2}{\mathrm{dt}}+\mathrm{AL}\&times;\mathrm{Na}\&times;\mathrm{Nc}\&times;\frac{\mathrm{<figure-callout\; id="1"\; label="dILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">dILs</figure-callout>}1}{\mathrm{dt}})(1-\mathrm{Dn})$

$\&ap;\mathrm{AL}\&times;\mathrm{Nc}(\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2+\mathrm{Na}\&times;\mathrm{\&Delta;ILs}1)$

Equally, we can calculate the over-current protection point of this two-way output:

$\mathrm{\&Delta;ILs}1o\&GreaterEqual;\frac{\mathrm{VREF}}{\mathrm{AL}\&times;\mathrm{Nc}}-\frac{\mathrm{Nb}\&times;\mathrm{\&Delta;<figure-callout\; id="2"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000032.png"\; state="\{\{state\}\}">ILs</figure-callout>}2}{\mathrm{Na}}$

$\mathrm{\&Delta;ILs}2o\&GreaterEqual;\frac{\mathrm{VREF}}{\mathrm{AL}\&times;\mathrm{Nc}}-\frac{\mathrm{Na}\&times;\mathrm{\&Delta;<figure-callout\; id="1"\; label="ILs"\; filenames="H07101900820070305E000011.png,H07101900820070305E000062.png"\; state="\{\{state\}\}">ILs</figure-callout>}1}{\mathrm{Nb}}$

In the past surface analysis as can be known, the end of the same name of L1c also can be opposite with L1a, L1b, equally also Noodles is calculated the mistakes flow point of each winding like the computational methods of inverse-excitation type in the past, does not just repeat to have calculated one by one here.

Same this method also can be used for the overcurrent protection between the above auxilliary output road of main output road and two-way and two-way.Analytical method is with top identical.

Obviously, the electric current that the detects winding L 1c electric current that flows into end and the first winding L 1a and the second winding L 1b flow into end also can end of the same name each other.At this moment, the anode of the 5th diode links to each other with voltage detecting comparison module 2 with the 5th electric capacity, and the negative electrode of the 5th diode links to each other with detection winding L 1C.Corresponding analytical method and inverse-excitation type are similar.Here do not make labor.

Embodiment five

As shown in Figure 8; this embodiment is with the difference of embodiment one: the electric current of two windings of the instrument transformer of being connected on main output road and the auxilliary output road flows into holds different name end each other; the magnetic flux that promptly main output road electric current produces in transformer core produces flow direction with other auxilliary output road electric current in transformer core be opposite, equally also can reach the purpose of carrying out overcurrent protection simultaneously to the output to multichannel.

The directed pressure regulation current protection technology of the elevation type that the analytical method of sort circuit and front are said is similar, does not also make labor here.Same this method also can be used for the overcurrent protection between the above auxilliary output road of main output road and two-way and two-way.Analytical method is with top identical.

Obviously; above-mentioned these several over-current protection methods can be applied in the multiple-output electric power of other topology form; in the various topology that can be applicable to multiple-output electric power such as buck (BUCK), boost type (BOOST), step-down/up type, positive activation type, push-pull type, semibridge system, full-bridge type; corresponding distortion circuit and inverse-excitation type are similar, and we do not list one by one.

For having serially added instrument transformer in the output loop, sharp again in addition to the electromagnetic compatibility of output.

Embodiment six

As shown in Figure 9, this embodiment is a kind of distortion of embodiment shown in Figure 2.

Embodiment seven

As shown in figure 10, this embodiment is the another kind distortion of embodiment shown in Figure 2.

Embodiment eight

As shown in figure 11, this embodiment is another distortion of embodiment shown in Figure 3.Obviously, at other embodiments multiple corresponding distortion circuit is arranged also.

Embodiment nine

As shown in figure 12, the difference of this embodiment and embodiment one is: the voltage detecting comparison module of this embodiment 2 is made up of discrete components and parts such as triodes.

Embodiment ten

As shown in figure 13, the difference of this embodiment and embodiment one is: the voltage detecting comparison module 2 of this embodiment is a kind of overcurrent that comprises timing circuit protective circuit of having the hiccups.

Embodiment 11

As shown in figure 14, this embodiment is with the difference of embodiment one: described multiple-output electric power is the positive activation type circuit topology.

Same principle, Fig. 4, Fig. 5, Fig. 6 and circuit shown in Figure 8 can equally with Fig. 3 carry out corresponding various distortion, and voltage detecting comparison module 2 also can constitute with the discrete component or the protective circuit of having the hiccups.

Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (11)

1. multiple-output electric power, comprise transformer, energy supply control module, voltage detecting comparison module and switching tube with at least two output roads, described at least two output roads comprise main output road and auxilliary output road, the output of described energy supply control module links to each other with the input of transformer by switching tube, and the output of described voltage detecting comparison module links to each other with the input of energy supply control module; It is characterized in that:

Also comprise instrument transformer, described instrument transformer comprises detection winding and at least two output road windings; Be unity couping between the winding of described instrument transformer; One end ground connection of described detection winding, the other end of described detection winding links to each other with an input of described voltage detecting comparison module, and another input of described voltage detecting comparison module receives reference voltage signal; The number of described output road winding is smaller or equal to the number on the output road of described transformer, and described each output road winding is connected on respectively on the output road.

2. multiple-output electric power according to claim 1 is characterized in that:

Described output road winding comprises being connected on first winding on the first auxilliary output road and being connected on second assists second winding of exporting on the road, the electric current of described first winding and detection winding flows into end end of the same name each other, and described second winding is held different name end each other with the electric current inflow that detects winding.

3. multiple-output electric power according to claim 2 is characterized in that:

Described multiple-output electric power satisfies:

And/or

Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being output overcurrent on the described first auxilliary output road, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being the described second auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, Ds is the duty ratio that described switching tube when flowing is passed by in the first auxilliary output, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, the variable quantity of electric current on the corresponding Transformer Winding in the first auxilliary output road when variable quantity of electric current on the Transformer Winding of second auxilliary output road correspondence when Δ ILs2 is the first auxilliary output road output overcurrent, Δ ILs1 are the second auxilliary output road output overcurrent.

4. multiple-output electric power according to claim 1 is characterized in that:

Described output road winding comprises being connected on first winding on the first auxilliary output road and being connected on second assists second winding of exporting on the road, the electric current of described first winding and described second winding flows into end end of the same name each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

5. multiple-output electric power according to claim 4 is characterized in that:

Described multiple-output electric power satisfies:

And/or

Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being the described first auxilliary output road output overcurrent, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being the described second auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, the variable quantity of electric current on the corresponding Transformer Winding in the first auxilliary output road when variable quantity of electric current on the Transformer Winding of second auxilliary output road correspondence when Δ ILs2 is the first auxilliary output road output overcurrent, Δ ILs1 are the second auxilliary output road output overcurrent.

6. multiple-output electric power according to claim 1 is characterized in that:

Described output road winding comprises first winding that is connected on the first auxilliary output road, be connected on second winding on the second auxilliary output road and be connected on the tertiary winding on the 3rd auxilliary output road, the electric current of described first winding and described second winding flows into end end of the same name each other, the electric current of described first winding and the described tertiary winding flows into holds different name end each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

7. multiple-output electric power according to claim 1 is characterized in that:

Described output road winding comprises first winding that is connected on the main output road, is connected on second winding on the auxilliary output road, the electric current of described first winding and described second winding flows into end end of the same name each other, and the electric current of described first winding and described detection winding flows into holds different name end each other.

8. multiple-output electric power according to claim 7 is characterized in that:

Described multiple-output electric power satisfies:

And/or

Wherein, Δ ILs1o flows through the current change quantity of corresponding Transformer Winding when being described main output road output overcurrent, Δ ILs2o flows through the current change quantity of corresponding Transformer Winding when being described auxilliary output road output overcurrent, VREF is the reference voltage of described another input of voltage detecting comparison module, AL is the inductance coefficent of described transformer core, Na is the number of turn of described instrument transformer first winding, Nb is the number of turn of described instrument transformer second winding, Nc is the number of turn that described instrument transformer detects winding, Δ ILs2 is the variable quantity that electric current on the Transformer Winding of auxilliary output road correspondence is flow through in main output when passing by stream, Δ ILs1 be auxilliary output when passing by stream the master export the variable quantity of electric current on the Transformer Winding of road correspondence.

9. multiple-output electric power according to claim 1 is characterized in that:

Described output road winding comprises first winding that is connected on the main output road, is connected on second winding on the auxilliary output road, the electric current of described first winding and detection winding flows into holds different name end each other, and the electric current of described second winding and detection winding flows into holds end of the same name each other.

10. according to each described multiple-output electric power in the claim 1 to 9, it is characterized in that:

Be provided with rectification filtering module between described detection winding and the voltage detecting comparison module.

11., it is characterized in that according to each described multiple-output electric power in the claim 1 to 9:

Described multiple-output electric power is inverse-excitation type or positive activation type or buck or boost type or step-down/up type or push-pull type or semibridge system or full-bridge type topology.

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