CN101212181A - Multi-output power supply - Google Patents

Abstract

The invention relates to a multi-path output power supply, in particular to a multi-path output power supply capable of improving the load regulation rate of auxiliary circuits in a plurality of output power supplies, which comprises a transformer, and a main circuit output circuit and at least one auxiliary circuit output circuit which are connected with an auxiliary side winding of the transformer; different windings of a mutual inductor are respectively connected in series in the main circuit output circuit and the at least one auxiliary circuit output circuit, and one end of the main circuit output current flowing into the main circuit series winding and one end of the at least one auxiliary circuit output current flowing into the auxiliary circuit series winding are homonymous ends. The invention has the following significant advantages: the loss can not be brought; the output load adjustment rate of the auxiliary road can reach the best; the voltage stabilization precision of the auxiliary road output can be greatly improved; the number of turns of the transformer is not required to be adjusted; the added mutual inductor can be directly quantized and calculated, and is not influenced by duty ratio; the implementation cost is extremely low, and the cost performance is extremely high; the mutual inductor is connected in series in the output circuit, so that the electromagnetic compatibility characteristic of the related output circuit can be improved.

Description

A kind of multiple-output electric power

Technical field

The present invention relates to multiple-output electric power, particularly a kind of power supply that improves bypass load regulation in the multiple-output electric power.

Background technology

At present, in the industry cycle in the multiple-output electric power of Ying Yonging, generally can only select one the tunnel to be output as main road output, choosing generally of main road output chosen according to the importance of each road output, the factors such as requirement, load current size and stability to the precision of voltage regulation.After main road was chosen, other road output just was bypass output.Because main road has primary feedback, so the main road output precision of voltage regulation is higher, but the precision of voltage regulation of other bypass output is just poor.The precision of voltage regulation of bypass output is subjected to factor affecting such as the line footpath, rectifier diode forward conduction voltage drop, input voltage variation, PCB cabling of main road load and variable quantity, this road bypass load and variable quantity, other bypass and variable quantity thereof, the corresponding Transformer Winding of each road bypass, when above-mentioned each variable quantity was big, the precision of voltage regulation of bypass output generally can surpass ± 10%; Intersect regulation even can exceed ± 15%.And the load regulation of this road output is topmost in above-mentioned each influencing factor, if the load regulation of this road output is improved preferably, then the precision of voltage regulation of this road output will be improved greatly.Industry mainly adopts the secondary voltage stabilizing technique to the improvement of load regulation at present, secondary voltage stabilizing technique commonly used be adopt series such as LM780X three-terminal regulator block voltage stabilizing technique (as shown in Figure 1, T10. transformer, D10. rectifier diode, C10 and C11 are filter capacitor) or triode voltage-regulating technique (or similar voltage-regulating technique, as shown in Figure 2, T20. transformer, D20. rectifier diode, C20. filter capacitor, Q20. triode, the U1. voltage-stabiliser tube).

Consider comprehensive price ratio, using regulator block voltage stabilizing pressure drop at present is generally more than the 1.25V, add output voltage minimal ripple lower limit, our the minimum voltage stabilizing pressure drop of design should be greater than more than the 1.8V, if output current is 200mA, the regulator block power consumption is 0.9W during operate as normal, just must add certain radiator ability operate as normal of dispelling the heat for the low pressure reduction three-terminal regulator block that adopts the less TO-252 encapsulation of encapsulation.When adopting the triode voltage-regulating technique,, increase a reference source and feedback sample resistance etc. though the voltage stabilizing pressure drop can reduce, but can increase cost and PCB area etc., and for guaranteeing output voltage lower limit energy steady operation, the voltage stabilizing pressure drop also is greater than more than the 1V, so still there is big power consumption.Also useful high frequency lifting technology carries out the secondary voltage stabilizing at present, and there is EMC (Electro Magnetic Compatibility comprises two aspects of electromagnetic interference EMI and electromagnetic susceptibility EMS) interference problem in this voltage stabilizing technique because control chip is more expensive, and corresponding usefulness is less.

In sum, for this output circuit to precision of voltage regulation wider range, though use the secondary voltage stabilizing technique the actual precision of voltage regulation is improved, must bring following problem: (1) this road output cost significantly improves the cost performance extreme difference; (2) the inevitable loss that brings of secondary voltage stabilizing causes power-efficient to reduce; (3) thermal losses of secondary voltage stabilizing needs the area of dissipation of radiator or other form to dispel the heat, and the heat of these losses simultaneously must make the thermal stress of its peripheral devices increase, and causes reliability to reduce; (4) the secondary voltage stabilizing circuit can increase the volume and the PCB area of power supply, and is very unfavorable for present power supply miniaturization development; (5) the transformer number of turn increases, and technique for coiling difficulty and cost all can increase; (6) can't carry out voltage compensation to output voltage output loop on the low side; (7) may also there be the EMC interference problem.

Summary of the invention

The object of the present invention is to provide a kind of most out-put supply, can improve the bypass load regulation.

The technical solution adopted for the present invention to solve the technical problems is: a kind of multiple-output electric power comprises transformer and the main road output circuit that links to each other with described transformer secondary winding and at least one road bypass output circuit; In main road output circuit and at least one road bypass output circuit, connecting the respectively different windings of an instrument transformer, and the main road output current flows into an end of winding that main road is gone here and there and an end of at least one bypass circuit output current inflow winding that bypass is gone here and there is an end of the same name.

Further, the described Transformer Winding number of turn that links to each other with the bypass output circuit be connected on the bypass output circuit in the ratio of umber of turn of instrument transformer greater than the ratio of the Transformer Winding number of turn that links to each other with the main road output circuit with the umber of turn that is connected on the instrument transformer in the main road output circuit.

Further, a kind of multiple-output electric power of the present invention comprises current rectifying and wave filtering circuit, and the instrument transformer winding of described main road output circuit and at least one road bypass output circuit is connected in series in respectively before the first order filter capacitor of described current rectifying and wave filtering circuit of described main road output circuit and at least one road bypass output circuit.

Further, described main road output circuit comprises feedback circuit.

Described main road output circuit comprises first winding of current rectifying and wave filtering circuit, sampling resistor Rs, feedback circuit and the instrument transformer be made up of first diode and first filter capacitor; The anode of described first diode links to each other with an end of transformer secondary first winding, and its negative electrode links to each other with an end of first filter capacitor and the cathode output end of main road; The other end of first filter capacitor links to each other with the other end of transformer first winding and the cathode output end of main road; The end of described sampling resistor Rs links to each other with the main road cathode output end, and the other end links to each other with feedback circuit, and the feedback circuit other end links to each other with the main road cathode output end; First windings in series of described instrument transformer is connected between described transformer first winding and first diode or between first diode and first filter capacitor or between transformer first winding and first filter capacitor, and is coupled with the N winding that is connected the instrument transformer in the N bypass output circuit; N 〉=2.

Described N bypass output circuit comprises the N winding of N diode, N filter capacitor and instrument transformer; The anode of described N diode links to each other with an end of transformer secondary N winding, and its negative electrode links to each other with an end of N filter capacitor; The other end of N filter capacitor links to each other with the other end of transformer N winding; The N windings in series of described instrument transformer is connected between transformer N winding and the N diode or between N diode and the N filter capacitor or between the other end of the other end of transformer N winding and N filter capacitor.

A kind of multiple-output electric power of the present invention can be a kind of in the following power supply: buck, boost type, step-down/up type, inverse-excitation type, positive activation type, semibridge system, full-bridge type or push-pull type multiple-output electric power.

Described instrument transformer is inductor or transformer or piezoelectric ceramic class transformer.

The present invention has following significant advantage: 1. can not bring loss; 2. can make this road bypass output loading regulation reach best, (can be 0 in theory); 3. can greatly improve the precision of voltage regulation of bypass output; 4. need not carry out number of turn adjustment to transformer; 5. add instrument transformer and can directly quantize to calculate, and not influenced by duty ratio; 6. implementation cost is extremely low, and cost performance is high; 7. serial mutual inductor in output loop can improve the electromagnetic compatibility characteristic on relevant output road.

Description of drawings

The present invention is further elaborated with specific embodiment with reference to the accompanying drawings below.

Fig. 1 is the existing electrical block diagram that adopts the multiple-output electric power of three-terminal regulator block voltage stabilizing.

Fig. 2 is the existing electrical block diagram that adopts the multiple-output electric power of triode voltage-regulating technique.

Fig. 3 a is a kind of electrical block diagram of inverse-excitation type multiple-output electric power.

Fig. 3 b is the parameter schematic diagram of main road output circuit in Fig. 3 a circuit.

Fig. 3 c is the parameter schematic diagram of bypass output circuit in Fig. 3 a circuit.

Fig. 4 a is the electrical block diagram of a kind of multiple-output electric power in the one embodiment of the invention.

Fig. 4 b is the parameter schematic diagram of main road output circuit in Fig. 4 a circuit.

Fig. 4 c is the parameter schematic diagram of bypass output circuit in Fig. 4 a circuit.

Fig. 5 is a kind of structural representation that is out of shape circuit of power supply shown in Fig. 4 a.

Fig. 6 is a kind of structural representation that is out of shape circuit of power supply shown in Fig. 4 a.

Fig. 7 is a kind of structural representation that is out of shape circuit of power supply shown in Fig. 4 a.

Fig. 8 is a kind of structural representation that is out of shape circuit of power supply shown in Fig. 4 a.

Fig. 9 is the electrical block diagram of a kind of multiple-output electric power in the one embodiment of the invention.

Figure 10 is the electrical block diagram of a kind of multiple-output electric power in the one embodiment of the invention.

A kind of electrical block diagram of multiple-output electric power in Figure 11 one embodiment of the invention.

Embodiment

Multiple-output electric power of the present invention can be the multiple-output electric power of topological structures such as inverse-excitation type, positive activation type, buck, boost type, step-down/up type, semibridge system, full-bridge type, push-pull type.Inverse-excitation type multiple-output electric power with a two-way output is that example is set forth the principle of power supply of the present invention below.And the bypass output voltage rated value of this inverse-excitation type multiplex output circuit is higher than main road output voltage rated value.

Generally speaking, the bypass output of multiple-output electric power is less because of electric current, and the used enamelled wire line of Transformer Winding footpath is also thinner, so the line resistance is bigger, same reason, the used PCB trace width of its output loop is also narrower, and the resistance of its line also can be relatively large, or the like similar reason, the total equivalent line resistance of its output loop can be bigger, when output current changed greatly, the pressure drop in the line resistance also can change bigger, causes its load regulation bigger.

We at first analyze because of the load regulation situation of change that the line resistance causes the bypass output before not improving.Shown in Fig. 3 a, a kind of inlet circuit of inverse-excitation type multiple-output electric power comprises the switch Q1 that is in series and is connected with the former limit of transformer T1 winding, its input connects direct voltage VinDC, and its multiplex output circuit partly comprises main road output circuit and bypass output circuit that links to each other with transformer T1 secondary winding.

We suppose that the Vo2 road is bypass output, and Vo1 is main road output, and the comprehensive line resistance of resistance of transformer line and PCB and other cabling equivalence is first line resistance r1, second line resistance r2, three-way resistance r3 and the 4th line resistance r4.For the purpose of convenient the analysis, we ignore other situation.The main road output circuit comprises current rectifying and wave filtering circuit, feedback circuit 12 and the sampling resistor Rs that is made up of the first diode D1 and the first filter capacitor C1.Wherein, the anode of the first diode D1 links to each other with an end of transformer T1 secondary first winding, and its negative electrode links to each other with the end of the first filter capacitor C1.The other end of the first filter capacitor C1 links to each other with the other end of transformer T1 first winding.The end of sampling resistor Rs links to each other with the cathode output end of main road output circuit, and the other end links to each other with feedback circuit 12, and the other end of feedback circuit 12 links to each other with the cathode output end of main road output circuit.First line resistance r1 and second line resistance r2 as equivalent resistance are connected in the circuit.

The circuit structure of bypass output circuit is similar to the main road output circuit, has only lacked feedback circuit, comprises the current rectifying and wave filtering circuit that is serially connected between transformer T1 secondary second winding and the bypass output circuit output, comprises the second diode D2 and the second filter capacitor C2.Three-way resistance r3 and the 4th line resistance r4 as equivalent electric circuit are connected in the circuit.

At first output voltage situation of change under the corresponding two kinds of current conditions of bypass output circuit is analyzed, the supposition output load current rises earlier, i.e. Io2 '＞Io2.For the purpose of convenient the analysis, suppose transformer T1 current work (electric current and voltage condition are shown in Fig. 3 b and Fig. 3 c in the circuit) under critical discontinuous mode; Then have:

Vo2＝(ULs2-r3×ILs2-VD2)(1-D)-r4×Io2

＝(ULs2-VD2)(1-D)-2×r3×Io2-r4×Io2

Vo2′＝(ULs2-r3×ILs2′-VD2)(1-D)-r4×Io2′

＝(ULs2-VD2)(1-D)-2×r3×Io2′-r4×Io2′

Can derive: Vo2-Vo2 '=(2 * r3+r4) * (Io2 '-Io2) (1)

Below we introduce the method that the present invention improves bypass output loading regulation.The power work condition is consistent with the condition of work of Fig. 3 circuit.In the main road output circuit with the bypass output circuit in connecting respectively in the circuit before the current rectifying and wave filtering circuit separately different windings of instrument transformer L1, and each road output current flows into the end end of the same name each other (shown in Fig. 4 a) of this road output string instrument transformer L1 of institute winding.Wherein, the winding of instrument transformer L1 can be connected in series in transformer T1 secondary winding and diode (D1, D2) (promptly be connected before the current rectifying and wave filtering circuit between, such as but not limited to, shown in Fig. 4 a), also can be connected in series in diode (D1, D2) and filter capacitor (C1, C2) between (before promptly being connected first order filter capacitor, such as but not limited to, as Fig. 5, shown in Figure 6), also can be connected in series in transformer T1 secondary winding and filter capacitor (C1, C2) between (before promptly being connected first order filter capacitor, such as but not limited to, as Fig. 7, shown in Figure 8).Among the present invention, instrument transformer L1 can be inductor or transformer equimagnetic coupled apparatus, also can adopt piezoelectric ceramic class transformer.

The number of turn of supposing to be connected on the first winding L 1a of the instrument transformer L1 in the main road output circuit is Na, and the voltage on the L1a is VL1a; The number of turn that is connected on the second winding L 1b of the instrument transformer L1 in the bypass output circuit is Nb, and the voltage on the L1b is VL1b; The instrument transformer coefficient of the magnetic core of instrument transformer L1 is AL.Instrument transformer L1 two around for unity couping be coefficient of mutual inductance $M=\sqrt{L1a\×L1b}.$ The conducting duty ratio of switching tube Q1 is D in the power input circuit.The number of turn of the former limit of transformer T1 winding is NP, and the number of turn of corresponding secondary first winding and second winding should be NS1, NS2 mutually, and VIN is the former limit of a transformer T1 input direct voltage.Electric current and voltage condition are shown in Fig. 4 b and Fig. 4 c in the circuit.

To adding after the instrument transformer pressure regulation, suppose the main road output circuit open loop of band feedback circuit 12, then the output voltage of two-way is respectively:

$\mathrm{VL}1a=L1a\frac{\mathrm{dILs}1}{\mathrm{dt}}+\frac{M\×\mathrm{dILs}2}{\mathrm{dt}}=\mathrm{AL}\×{\mathrm{Na}}^2\frac{\mathrm{dILs}1}{\mathrm{dt}}+\frac{\mathrm{AL}\×\mathrm{Nb}\×\mathrm{Na}\×\mathrm{dILs}2}{\mathrm{dt}}$

$\mathrm{VL}1b=L1b\frac{\mathrm{dILs}2}{\mathrm{dt}}+\frac{M\×\mathrm{dILs}1}{\mathrm{dt}}=\mathrm{AL}\×{\mathrm{Nb}}^2\frac{\mathrm{dILs}2}{\mathrm{dt}}+\frac{\mathrm{AL}\×\mathrm{Nb}\×\mathrm{Na}\×\mathrm{dILs}1}{\mathrm{dt}}$

$\mathrm{Vo}1a=(\mathrm{ULs}1-\mathrm{VL}1a-\mathrm{VD}1-r1\×\mathrm{ILs}1)(1-\mathrm{Dn})-\mathrm{Io}1\×r2$

$=(\mathrm{ULs}1-\mathrm{AL}\×{\mathrm{Na}}^2\frac{\mathrm{dILs}1}{\mathrm{dt}}-\mathrm{AL}\×\mathrm{Na}\×\mathrm{Nb}\×\frac{\mathrm{dILs}3}{\mathrm{dt}}-\mathrm{VD}1-r1\×\mathrm{Ils}1)(1-\mathrm{Dn})-\mathrm{Io}1\×r2$

$\≈(\mathrm{ULs}1-\mathrm{VD}1-r1\×\mathrm{ILs}1)(1-D)-\mathrm{AL}\×\mathrm{Na}(\mathrm{Nb}\×\mathrm{\ΔILs}2+\mathrm{Na}\×\mathrm{\ΔILs}1)-\mathrm{Io}1\×r2$

$\mathrm{Vo}2a=(\mathrm{ULs}2-\mathrm{VL}1b-\mathrm{VD}2-r3\×\mathrm{ILs}2)(1-\mathrm{Dn})-\mathrm{Io}2\×r4$

$=(\mathrm{ULs}2-\mathrm{AL}\×{\mathrm{Nb}}^2\frac{\mathrm{dILs}2}{\mathrm{dt}}-\mathrm{AL}\×\mathrm{Na}\×\mathrm{Nb}\×\frac{\mathrm{dILs}1}{\mathrm{dt}}-\mathrm{VD}2-r3\×\mathrm{ILs}2)(1-\mathrm{Dn})-\mathrm{Io}2\×r4$

$\≈(\mathrm{ULs}2-\mathrm{VD}2-r3\×\mathrm{ILs}2)(1-\mathrm{Dn})-\mathrm{AL}\×\mathrm{Nb}(\mathrm{Na}\×\mathrm{\ΔILs}1+\mathrm{Nb}\×\mathrm{\ΔILs}2)-\mathrm{Io}2\×r4$

As can be known, when output voltage V o1, the Vo2 of main road output circuit and bypass output circuit descended, the output voltage V o1 slippage of main road output circuit was AL*Na (Nb* Δ Ils2+Na* Δ Ils1) during open loop from top formula.And the main road output circuit is a closed loop during operate as normal, for keeping the stable of this road output voltage, and when the output voltage V o1 of main road output circuit descends, the conducting duty ratio that can regulate former limit switching tube Q1 by feedback loop.

The output voltage V o1 (corresponding former duty ratio) that adds the preceding main road output circuit of instrument transformer L1 will equate then have with the output voltage V o1 (corresponding new duty ratio) after adding instrument transformer L2:

Vo1a＝(ULs1-r1×ILs1-VD1)(1-Dn)-AL×Na(Nb×ILs2+Na×ILs1)-Io1×r2＝Vo1＝(ULs1-r1×ILs1-VD1)(1-D)-Io1×r2

Corresponding to the inverse-excitation type topology, have:

$\mathrm{ULsi}=\frac{\mathrm{NS}1\×\mathrm{VIN}\×D}{\mathrm{NP}\×(1-D)}$

Ulsi represents that the I road exports the coupled voltages at corresponding transformer T1 winding two ends in the formula.

The duty ratio that can make new advances is:

$\mathrm{Dn}=D+\frac{\mathrm{NP}\×\mathrm{AL}\×\mathrm{Na}(\mathrm{Nb}\×\mathrm{\ΔILs}2+\mathrm{Na}\×\mathrm{\ΔILs}1)}{\mathrm{NS}1\×\mathrm{VIN}}$

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

${\mathrm{Vo}2a}^{\′}=\mathrm{Vo}2+\frac{(\mathrm{NS}2-\mathrm{NS}1)\×\mathrm{AL}\×\mathrm{Na}(\mathrm{Nb}\×\mathrm{\ΔILs}2+\mathrm{Na}\×\mathrm{\ΔILs}1)}{\mathrm{NS}1}$

Same, when Vo2 road output load current was changed to Io2 ', this road output voltage also can change, and suppose that main road output voltage V o1 and electric current I o1 remain unchanged this moment, and then the bypass output voltage is:

${\mathrm{Vo}2a}^{\′\′}={\mathrm{Vo}2}^{\′}+\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×\mathrm{AL}(\mathrm{Nb}\×\mathrm{\ΔI}{\mathrm{Ls}2}^{\′}+\mathrm{Na}\×\mathrm{\ΔILs}1)}{\mathrm{NS}1}$

${\mathrm{Vo}2a}^{\′}-{\mathrm{Vo}2a}^{\′\′}=(2\×r3+r4)\×({\mathrm{Io}2}^{\′}-\mathrm{Io}2)+\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×\mathrm{AL}\×\mathrm{NaNb}(\mathrm{\ΔILs}2-\mathrm{\Δ}{\mathrm{ILs}2}^{\′})}{\mathrm{NS}1}$

$=((2\×r3+r4)-\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×2\×\mathrm{AL}\×\mathrm{Nb}}{\mathrm{NS}1})\×({\mathrm{Io}2}^{\′}-\mathrm{Io}2)$

Condition below satisfying following formula and front (1) formula contrasted as can be known, as long as just can reach the purpose of improving bypass output circuit output loading regulation, that is:

$(2\×r3+r4)\×({\mathrm{Io}2}^{\′}-\mathrm{Io}2)>|((2\×r3+r4)-\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×2\×\mathrm{AL}\×\mathrm{Nb}}{\mathrm{NS}1})\×({\mathrm{Io}2}^{\′}-\mathrm{Io}2)|$

Can get from following formula:

$4r3+2r4>\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×2\×\mathrm{AL}\×\mathrm{Nb}}{\mathrm{NS}1}>0$

As long as satisfy above-mentioned condition, just can reach the purpose that load regulation is improved, when particularly under satisfying, showing condition, reach best (being 0 in theory):

$2r3+r4=\frac{(\mathrm{NS}2\×\mathrm{Na}-\mathrm{NS}1\×\mathrm{Nb})\×2\×\mathrm{AL}\×\mathrm{Nb}}{\mathrm{NS}1}---\left(2\right)$

From following formula as can be known, as long as the ratio that bypass is exported the instrument transformer L1 umber of turn of being connected in corresponding transformer T1 umber of turn and the bypass output loop is exported the ratio of the serial mutual inductor L1 of institute umber of turn in corresponding transformer T1 umber of turn and the main road output loop greater than main road, promptly $\frac{\mathrm{NS}2}{\mathrm{Nb}}\≥\frac{\mathrm{NS}1}{\mathrm{Na}},$ Design the number of turn of each winding of instrument transformer again according to this inequality, just can play the purpose of improving the bypass load regulation, satisfy (2) formula again if add the line resistance of instrument transformer L1 parameter and bypass output loop simultaneously, just can make the load regulation of this road bypass output reach minimum.

For the reverse exciting topological structure, when transformer T1 current work during at discontinuous mode or continuous mode, can calculate an equation that can make bypass output circuit load regulation minimum equally, the difference of itself and critical discontinuous mode only is that the transformational relation between transformer current and the output current mean value changes, computational methods are the same with reasoning process, so not at this detailed description.

The method of improving bypass output loading regulation described above can be used for having the multiple-output electric power of two-way or the above bypass of two-way equally.At this moment, be arranged in main road output circuit and each bypass output circuit circuit before the first order filter capacitor of current rectifying and wave filtering circuit separately connecting respectively an instrument transformer (inductor or transformer) a winding (such as but not limited to, arrive shown in Figure 11 as Fig. 9), and each road output current flows into the end end of the same name each other of this road output institute string instrument transformer winding.Wherein, the computational analysis method of instrument transformer umber of turn is to top similar, and corresponding distortion circuit is to top similar, so not at this detailed description.Among Fig. 9, diode D3 and capacitor C 3 belong to power supply the second road bypass output circuit, and Vo3 is the output voltage of the second road bypass output circuit, and L1c is the tertiary winding of instrument transformer L1.

By that analogy, the method of improving bypass output loading regulation that is adopted in the foregoing description can be applied in the multiple-output electric power of other topology form equally, as buck (BUCK), boost type (BOOST), step-down/up type, positive activation type (as shown in figure 10), semibridge system, full-bridge type (as shown in figure 11), recommend etc. in the various topology that can be applicable to multiple-output electric power, corresponding distortion circuit and inverse-excitation type are similar, computational methods are similar, so not at this detailed description.

Among Figure 10, diode Dn and capacitor C n belong to power supply (n-1) road bypass output circuit, and Von is the output voltage of (n-1) road bypass output circuit, and (n-1) winding that will not be connected in series in the instrument transformer L1 in the circuit among the figure draws.Among Figure 11, switching tube Q1 belongs to the control switch of multiplex output circuit inlet circuit to Q4, diode D11, D21 are respectively the rectifier diode of each road output circuit to Dml, diode Dm and capacitor C m belong to power supply (m-1) road bypass output circuit, Vom is the output voltage of (m-1) road bypass output circuit, and second winding that will not be connected in series in the instrument transformer L1 in the first via bypass output circuit among the figure draws.

For a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (8)

1. a multiple-output electric power comprises transformer and the main road output circuit that links to each other with described transformer secondary winding and at least one road bypass output circuit; It is characterized in that:

In main road output circuit and at least one road bypass output circuit, connecting the respectively different windings of an instrument transformer, and the main road output current flows into an end of winding that main road is gone here and there and an end of at least one bypass circuit output current inflow winding that bypass is gone here and there is an end of the same name.

2. multiple-output electric power according to claim 1 is characterized in that: the described Transformer Winding number of turn that links to each other with the bypass output circuit be connected on the bypass output circuit in the ratio of umber of turn of instrument transformer greater than the ratio of the Transformer Winding number of turn that links to each other with the main road output circuit with the umber of turn that is connected on the instrument transformer in the main road output circuit.

3. multiple-output electric power according to claim 2, it is characterized in that: comprise current rectifying and wave filtering circuit, the instrument transformer winding of described main road output circuit and at least one road bypass output circuit is connected in series in respectively before the first order filter capacitor of described current rectifying and wave filtering circuit of described main road output circuit and at least one road bypass output circuit.

4. multiple-output electric power according to claim 3 is characterized in that: described main road output circuit comprises feedback circuit.

5. multiple-output electric power according to claim 4 is characterized in that: described main road output circuit comprises first winding of current rectifying and wave filtering circuit, sampling resistor Rs, feedback circuit and the instrument transformer be made up of first diode and first filter capacitor; The anode of described first diode links to each other with an end of transformer secondary first winding, and its negative electrode links to each other with an end of first filter capacitor and the cathode output end of main road; The other end of first filter capacitor links to each other with the other end of transformer first winding and the cathode output end of main road; The end of described sampling resistor Rs links to each other with the main road cathode output end, and the other end links to each other with feedback circuit, and the feedback circuit other end links to each other with the main road cathode output end; First windings in series of described instrument transformer is connected between described transformer first winding and first diode or between first diode and first filter capacitor or between transformer first winding and first filter capacitor, and is coupled with the N winding that is connected the instrument transformer in the N bypass output circuit; N 〉=2.

6. multiple-output electric power according to claim 5 is characterized in that: described N bypass output circuit comprises the N winding of N diode, N filter capacitor and instrument transformer; The anode of described N diode links to each other with an end of transformer secondary N winding, and its negative electrode links to each other with an end of N filter capacitor; The other end of N filter capacitor links to each other with the other end of transformer N winding; The N windings in series of described instrument transformer is connected between transformer N winding and the N diode or between N diode and the N filter capacitor or between the other end of the other end of transformer N winding and N filter capacitor.

7. according to described any multiple-output electric power of claim 1 to 6, it is characterized in that, is a kind of in the following power supply: buck, boost type, step-down/up type, inverse-excitation type, positive activation type, semibridge system, full-bridge type or push-pull type multiple-output electric power.

8. multiple-output electric power according to claim 7 is characterized in that: described instrument transformer is inductor or transformer or piezoelectric ceramic class transformer.

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