CN1389971A - Dc-to-DC converter with several outputs and its conversion method - Google Patents
Dc-to-DC converter with several outputs and its conversion method Download PDFInfo
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- CN1389971A CN1389971A CN 02134394 CN02134394A CN1389971A CN 1389971 A CN1389971 A CN 1389971A CN 02134394 CN02134394 CN 02134394 CN 02134394 A CN02134394 A CN 02134394A CN 1389971 A CN1389971 A CN 1389971A
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Abstract
The invention discloses the DC/DC converter with multiple outputs and the converting method. The input voltage is converted through the two single ended insulated converters with symmetrical structures. The amplitudes of the converted voltage output from the two converters are the same. Parallel connecting the two output ends of the converters form the DC bus with low voltage. With the input ends of the DC/DC converter units being connected to the said bus, the outputs of the DC/DC converter are as the outputs. The duty ratios of the two driving signals are equal to or larger than 50%. The square wave is not possible to be formed, which the voltage outputs having the phase difference of 180 degree from the converters being connected to paralleled. Since two transformers being used, straight through and breakage of the power switch tube will not be happened. The magnetic biasing does not exist.
Description
Technical field:
The present invention relates to a kind of multi-channel output direct stream/direct current (DC/DC) converter and transform method.
Background technology:
The DC/DC converter of multichannel output has characteristics such as easy to use, that volume is little, cost is lower, thereby uses very extensive.But present ubiquitous problem is: the precision of voltage regulation is not high, each road output influences each other when load variations, thereby can't use in the occasion of much having relatively high expectations.Also have some technical schemes to improve, but also brought simultaneously new problem at above problem, such as efficient reduce, cost is too high, control is complicated, reliability reduction, output voltage can not be regulated or the like on a large scale.
At present existing a kind of multichannel output DC/DC converter circuit can be referring in the technical literature of " the MODERN DC-TO-DC SWITCHMODE POWERCONVERTER CIRCUITS " by name that published by BLOOMassociates Inc. in 1985 (ISBN 0-442-21396-4), and its circuit as shown in Figure 1.This circuit is made of the two stage power conversion, first order Power Conversion adopts PUSH-PULL (recommending) circuit, former limit two switching tube S1, S2 are operated in the complementary state of fixing 50% duty ratio, the secondary winding adopts centre cap, be connected with full-wave rectifying circuit, form the low-voltage direct bus at secondary; Second level Power Conversion adopts a plurality of BUCK (voltage-dropping type is a booster type but also can adopt BOOST theoretically) circuit, and the input of BUCK circuit is connected with the low-voltage direct bus, and the output of BUCK circuit is as the output of multichannel output DC/DC converter.Because each BUCK circuit all adopts independent control, thereby each road output can both realize the high accuracy voltage stabilizing.But there is following shortcoming in this circuit:
1, first order Power Conversion adopts the PUSH-PULL circuit, former limit two switching tube S1, S2 are operated in the complementary state of fixing 50% duty ratio, because two switching tubes and drive circuit thereof can not be in full accord, be easy to form transformer bias, can cause circuit too complicated and will solve the transformer bias problem.Easily forming transformer bias is the intrinsic weakness of " PUSH-PULL " circuit, generally wants adjunct circuit dynamic adjustments duty ratio, makes its not magnetic bias, if but adopt and fix 50% duty ratio, duty ratio can't dynamic adjustments at this moment, will cause magnetic bias easilier.
2, first order Power Conversion adopts the PUSH-PULL circuit, because there is the conducting time-delay in former limit switching tube, and the duty-cycle loss that causes of transformer leakage inductance, through after the full-wave rectification, actual waveform is not a direct current on the low-voltage direct bus, but the duty ratio square wave of big (generally about 95%), when second level BUCK circuit is connected on the low-voltage direct bus, for ease of keeping system stability, the switch of BUCK circuit must be synchronous with the control of former limit switch, thereby cause circuit too complicated.In fact, for this class double-end converter (double-end) of PUSH-PULL (or HALF-BRIDGE or FULL-BRIDGE), will leave the dead band in actual applications, duty ratio can be slightly less than 50%, otherwise causes switching tube to damage easily.This has also caused having square wave on the low-voltage direct bus, has increased the difficulty of control.
Summary of the invention:
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of multi-channel output direct stream/DC converter and transform method are provided, and realizes stable low-voltage direct bus, be convenient to control, and circuit is simple and reliable, and cost is low.
For achieving the above object, the present invention proposes a kind of multi-channel output direct stream/DC converter and transform method.
Described multi-channel output direct stream/DC converter comprises the two stage power converting means, the input of first order power conversion unit links to each other with input voltage (Vin), output forms low-voltage direct bus (DCBUS), second level power conversion unit comprises a plurality of DC unit, the input of each DC unit is connected with low-voltage direct bus (DC BUS), and output is as the output of multi-channel output direct stream/DC converter; It is characterized in that: first order power conversion unit comprises the single-ended isolated converter that two symmetrical configuration, voltage pulse output amplitude equate; The two-way drive signal duty ratio that control circuit produced of two isolated converters is equal to or greater than 50%, 180 ° of phase phasic differences; Two isolated converter inputs are in parallel and link to each other with input voltage (VIN); Output is also in parallel, promptly anodally links to each other with positive pole, negative pole links to each other with negative pole, forms described low-voltage direct bus (DC BUS).
Described multi-channel output direct stream/DC converting method, comprise the steps: to form the low-voltage direct busbar voltage after input voltage (Vin) is by first order Power Conversion, again through second level Power Conversion, the output multipath CD signal, it is characterized in that: described first order Power Conversion is divided into two-way with input voltage (Vin), carry out Power Conversion respectively, produce that two voltage magnitudes are identical, duty ratio is equal to or greater than 50%, the output pulse of phase phasic difference 180 degree, with described two output superimposed pulses, form the low-voltage direct busbar voltage again.
Owing to adopted above scheme, first order power conversion unit with two single-ended isolated converters (in the present invention, single-ended isolated converter is meant that transformer is operated in the converter of first quartile), adopt suitable degaussing mode, can get bigger duty ratio and can not cause leading directly to and damaging of power switch pipe, just can not form square wave after their the output voltage parallel connection like this, but a stable direct current is convenient to control.Since two converters are independent separately, also just there is not the magnetic bias problem, and will guarantees that the voltage of exporting equates, only need two identical transformers of converter using output voltage to get final product, convenient and easy, do not need complicated circuit, cost is low.
Description of drawings:
Fig. 1 is a kind of multichannel output DC/DC converter circuit of the prior art;
Fig. 2 is a kind of multichannel output DC/DC converter circuit of the present invention;
Fig. 3 is an another kind of multichannel output DC/DC converter circuit of the present invention;
Fig. 4 a is the third multichannel output DC/DC converter circuit of the present invention;
Fig. 4 b is the 4th a kind of multichannel output DC/DC converter circuit of the present invention;
Fig. 4 c is the 5th a kind of multichannel output DC/DC converter circuit of the present invention;
Fig. 4 d is the 6th a kind of multichannel output DC/DC converter circuit of the present invention;
Fig. 4 e is the 7th a kind of multichannel output DC/DC converter circuit of the present invention.
Embodiment:
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
The first order of multichannel output DC/DC converter of the present invention is two isolated converters, describes below and is referred to as A1.The second level is one or more DC/DC converters, these converter unifications might as well be called the A2 converter, the A2 converter can be the converter of voltage-dropping type, it also can be the converter of booster type, the input of A2 converter all is connected on the low-voltage direct bus DC BUS, and the output of A2 converter is exactly each output along separate routes of multichannel output DC/DC converter.Each A2 converter using is output voltage feedback and independently switching pulse modulation independently.
Among each embodiment of following description, the single-ended isolated converter of described symmetrical configuration has two, they comprise that respectively former secondary umber of turn is than first and second transformer T1, the T2 that equate, the symmetric position place is in series with first and second power switch tube S 1, S2 respectively on the former limit of first and second transformer T1, T2, the two-way drive signal duty ratio that former limit control circuit is produced is equal to or greater than 50%, phase phasic difference 180 degree, be connected to the gate pole of first and second power switch tube S 1, S2 respectively, drive first and second power switch tube S 1, S2; Be connected with first and second output rectifying tube SR1, SR2 respectively at first and second transformer T1, T2 secondary symmetric position place, form the two-way rectification circuit, the anode of two-way rectification circuit links to each other with anode, and negative terminal links to each other with negative terminal, thereby forms described low-voltage direct bus DC BUS.
Suppose that two-way drive signal duty ratio equals 50%, when S1 opens, S2 turn-offs, this moment, T2 resetted by the resonance potential on the electric capacity, and transformer T1 forward excitation also transmits energy to secondary, and SR1 is open-minded, SR2 turn-offs, voltage on the secondary low-voltage direct bus DC BUS is Vin/N1 at this moment, and Vin is an input voltage, and N1 is the turn ratio of winding Np1 and Ns1; S2 is open-minded after half switch periods, and S1 turn-offs, and this moment, T1 resetted by the resonance potential on the electric capacity, transformer T2 forward excitation also transmits energy to secondary, and SR2 is open-minded, and SR1 turn-offs, voltage on the secondary low-voltage direct bus DC BUS is Vin/N2 at this moment, and N2 is the turn ratio of winding Np2 and Ns 2; Thereby when N1 equaled N2, the voltage on the secondary low-voltage direct bus DC BUS was the Constant Direct Current that is proportional to input voltage vin.And existing processing technology can realize N1=N2 fully.
Embodiment one: see Fig. 2, its isolating transformer adopts the voltage resonance degaussing, and resonant capacitance is connected in parallel on the winding of the former limit of transformer.Isolated converter A1 in the described multichannel output DC/DC converter circuit adopts the forward conversion mode, its the first transformer T1 and the second transformer T2 adopt the voltage resonance degaussing, resonant capacitance C1 is connected in parallel on the former limit winding Np1 of T1, and resonant capacitance C2 is connected in parallel on the former limit winding Np2 of T2.
Embodiment two: see Fig. 3, its isolating transformer adopts tertiary winding degaussing.Isolated converter A1 in the described multichannel output DC/DC converter circuit adopts the forward conversion mode, its the first transformer T1 and the second transformer T2 adopt tertiary winding degaussing, degaussing winding Nc1 and T1 coupling, the anode of Nc1 is connected with the negative electrode of diode D1, the negative terminal of Nc1 is connected with the positive pole of input power supply, and the anode of diode D1 is connected with the negative pole of input power supply.Degaussing winding Nc2 and T2 coupling, the anode of Nc2 is connected with the negative electrode of diode D2, and the negative terminal of Nc2 is connected with the positive pole of input power supply, and the anode of diode D2 is connected with the negative pole of input power supply.
Embodiment three: see Fig. 4 a, its isolating transformer adopts the voltage resonance degaussing, resonant capacitance is connected in parallel between the source electrode and drain electrode of former limit power MOS pipe, its structure is, described multichannel output DC/DC converter can be divided into two-stage from circuit structure, the first order is the isolated converter A1 of a not voltage stabilizing, A1 comprises the first transformer T1 and the second transformer T2, the former limit winding Np1 anode of T1 is connected with the former limit winding Np2 anode of T2, positive pole with the input power supply is connected again, the former limit winding Np1 negative terminal of T1 is connected with the drain electrode of power MOS pipe S1, the former limit winding Np2 negative terminal of T2 is connected with the drain electrode of power MOS pipe S2, the source electrode of S1 is connected with the source electrode of S2, negative pole with the input power supply is connected again, resonant capacitance C1 is connected in parallel between the source electrode and drain electrode of power MOS pipe S1, and resonant capacitance C2 is connected in parallel between the source electrode and drain electrode of power MOS pipe S2.The secondary winding Ns1 anode of T1 is connected with the secondary winding Ns2 anode of T2, anode as low-voltage direct bus DCBUS, the secondary winding Ns1 negative terminal of T1 is connected with the drain electrode of output rectifying tube SR1, the secondary winding Ns2 negative terminal of T2 is connected with the drain electrode of output rectifying tube SR2, the source electrode of SR1 is connected with the source electrode of SR2, negative terminal as low-voltage direct bus DC BUS, the secondary winding Ns1 negative terminal of T1 is connected with the gate pole of output rectifying tube SR2, and the secondary winding Ns2 negative terminal of T2 is connected with the gate pole of output rectifying tube SR1.
In this example, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, and the gate pole of rectifying tube SR1 is connected with the negative terminal of T2 secondary winding Ns2, and the gate pole of rectifying tube SR2 is connected with the negative terminal of T1 secondary winding Ns1.Described isolated converter A1 adopts the forward conversion mode, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, the secondary winding Ns1 anode of T1 is connected with the secondary winding Ns2 anode of T2, anode as low-voltage direct bus DC BUS, the secondary winding Ns1 negative terminal of T1 is connected with the drain electrode of output rectifying tube SR1, the secondary winding Ns2 negative terminal of T2 is connected with the drain electrode of output rectifying tube SR2, and the source electrode of SR1 is connected with the source electrode of SR2, as the negative terminal of low-voltage direct bus DC BUS.
Embodiment four: see Fig. 4 b, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, and the gate pole of rectifying tube SR1 drives winding Nd2 driving by the secondary of transformer T2, and the gate pole of rectifying tube SR2 drives winding Nd1 driving by the secondary of transformer T1.Described isolated converter A1 adopts the forward conversion mode, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, the secondary winding Ns1 anode of T1 is connected with the secondary winding Ns2 anode of T2, anode as low-voltage direct bus DCBUS, the secondary winding Ns1 negative terminal of T1 is connected with the drain electrode of output rectifying tube SR1, the secondary winding Ns2 negative terminal of T2 is connected with the drain electrode of output rectifying tube SR2, the source electrode of SR1 is connected with the source electrode of SR2, negative terminal as low-voltage direct bus DC BUS, the negative terminal that the secondary of transformer T2 drives winding Nd2 is connected with the gate pole of rectifying tube SR1, the anode of Nd2 is connected with the source electrode of rectifying tube SR1, the negative terminal that the secondary of transformer T1 drives winding Nd1 is connected with the gate pole of rectifying tube SR2, and the anode of Nd1 is connected with the source electrode of rectifying tube SR2.
Embodiment five: see Fig. 4 c, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, and the gate pole of rectifying tube SR1 drives winding Nd1 driving by the secondary of transformer T1, and the gate pole of rectifying tube SR2 drives winding Nd2 driving by the secondary of transformer T2.Described isolated converter A1 adopts the forward conversion mode, its secondary rectifying tube SR1 and SR2 adopt the common source connected mode, the secondary winding Ns1 anode of T1 is connected with the secondary winding Ns2 anode of T2, anode as low-voltage direct bus DCBUS, the secondary winding Ns1 negative terminal of T1 is connected with the drain electrode of output rectifying tube SR1, the secondary winding Ns2 negative terminal of T2 is connected with the drain electrode of output rectifying tube SR2, the source electrode of SR1 is connected with the source electrode of SR2, negative terminal as low-voltage direct bus DC BUS, the anode that the secondary of transformer T1 drives winding Nd1 is connected with the gate pole of rectifying tube SR1, the negative terminal of Nd1 is connected with the source electrode of rectifying tube SR1, the anode that the secondary of transformer T2 drives winding Nd2 is connected with the gate pole of rectifying tube SR2, and the negative terminal of Nd2 is connected with the source electrode of rectifying tube SR2.
Embodiment six: see Fig. 4 d, its secondary rectifying tube SR1 and SR2 adopt the common drain connected mode, and the gate pole of rectifying tube SR1 drives winding Nd2 driving by the secondary of transformer T2, and the gate pole of rectifying tube SR2 drives winding Nd1 driving by the secondary of transformer T1.Described isolated converter A1 adopts the forward conversion mode, its secondary rectifying tube SR1 and SR2 adopt the common drain connected mode, the secondary winding Ns1 anode of T1 is connected with the source electrode of output rectifying tube SR1, the secondary winding Ns2 anode of T2 is connected with the source electrode of output rectifying tube SR2, the drain electrode of SR1 is connected with the drain electrode of SR2, anode as low-voltage direct bus DC BUS, the secondary winding Ns1 negative terminal of T1 is connected with the secondary winding Ns2 negative terminal of T2, negative terminal as low-voltage direct bus DC BUS, the secondary of T2 drives winding Nd2 negative terminal and is connected with the gate pole of output rectifying tube SR1, the Nd2 anode is connected with the source electrode of SR1, the secondary of T1 drives winding Nd1 negative terminal and is connected with the gate pole of output rectifying tube SR2, and the Nd1 anode is connected with the source electrode of SR2.
Embodiment seven: see Fig. 4 e, its secondary rectifying tube SR1 and SR2 adopt the common drain connected mode, and the gate pole of rectifying tube SR1 drives winding Nd1 driving by the secondary of transformer T1, and the gate pole of rectifying tube SR2 drives winding Nd2 driving by the secondary of transformer T2.Described isolated converter A1 adopts the forward conversion mode, its secondary rectifying tube SR1 and SR2 adopt the common drain connected mode, the secondary winding Ns1 anode of T1 is connected with the source electrode of output rectifying tube SR1, the secondary winding Ns2 anode of T2 is connected with the source electrode of output rectifying tube SR2, the drain electrode of SR1 is connected with the drain electrode of SR2, anode as low-voltage direct bus DC BUS, the secondary winding Ns1 negative terminal of T1 is connected with the secondary winding Ns2 negative terminal of T2, negative terminal as low-voltage direct bus DC BUS, the secondary of T1 drives winding Nd1 anode and is connected with the gate pole of output rectifying tube SR1, the Nd1 negative terminal is connected with the source electrode of SR1, the secondary of T2 drives winding Nd2 anode and is connected with the gate pole of output rectifying tube SR2, and the Nd2 negative terminal is connected with the source electrode of SR2.
The DC/DC converter circuit of multichannel output of the present invention has following characteristics:
(1) because A2 converter using output voltage feedback independently, thereby each road output can both realize the high accuracy voltage stabilizing.
(2) because transformer T1 and T2 are operated in 50% or greater than the state of 50% duty ratio, low-voltage direct bus DC BUS can realize complete direct current and zero ripple, can reduce filter capacitor, and A1 and A2 can be coupled directly and avoid adopting complicated circuits such as isolating synchronous circuit.
(3) because the input of A2 converter all is connected on the low-voltage direct bus DC BUS, the output voltage of A2 converter only is subjected to the restriction of DC BUS voltage, thereby each road output voltage can be regulated separately on a large scale.
(4) because the input of A2 converter all is connected on the low-voltage direct bus DC BUS, the output voltage of A2 converter can be set up simultaneously, also can control settling time the output voltage on each road by other control circuit.
(5) output voltage needn't adopt isolated feedback, and circuit can obtain simplifying.
(6) because under the situation of 50% duty ratio, there are not problems such as transformer bias, power tube lead directly in two single-ended converters of A1 converter using, the circuit reliability height.
Claims (16)
1, a kind of multi-channel output direct stream/DC converter, comprise the two stage power converting means, the input of first order power conversion unit links to each other with input voltage (Vin), output forms low-voltage direct bus (DC BUS), second level power conversion unit comprises a plurality of DC unit, the input of each DC unit is connected with low-voltage direct bus (DC BUS), and output is as the output of multi-channel output direct stream/DC converter; It is characterized in that:
First order power conversion unit comprises the single-ended isolated converter that two symmetrical configuration, voltage pulse output amplitude equate; The two-way drive signal duty ratio that control circuit produced of two isolated converters is equal to or greater than 50%, 180 ° of phase phasic differences;
Two isolated converter inputs are in parallel and link to each other with input voltage (VIN); Output is also in parallel, promptly anodally links to each other with positive pole, negative pole links to each other with negative pole, forms described low-voltage direct bus (DCBUS).
2, multi-channel output direct stream/DC converter as claimed in claim 1, it is characterized in that: the single-ended isolated converter of described symmetrical configuration has two, they comprise former secondary umber of turn respectively than equate first, two transformer (T1, T2), first, two transformer (T1, T2) symmetric position place, former limit is in series with first respectively, two power switch pipe (S1, S2), the two-way drive signal duty ratio that former limit control circuit is produced is equal to or greater than 50%, phase phasic difference 180 degree, be connected to first respectively, two power switch pipe (S1, S2) gate pole drives first, two power switch pipe (S1, S2); Be connected with first and second output rectifying tube (SR1, SR2) respectively at first and second transformer (T1, T2) secondary symmetric position place, form the two-way rectification circuit, the anode of two-way rectification circuit links to each other with anode, and negative terminal links to each other with negative terminal, thereby forms described low-voltage direct bus (DC BUS).
3, multi-channel output direct stream/DC converter as claimed in claim 1 or 2 is characterized in that: former limit winding (Np1) anode of first transformer (T1) is connected with former limit winding (Np2) anode of second transformer (T2), and the positive pole with the input power supply is connected again; Former limit winding (Np1) negative terminal of first transformer (T1) is connected with the drain electrode of first power switch pipe (S1), former limit winding (Np2) negative terminal of second transformer (T2) is connected with the drain electrode of second power switch pipe (S2), the source electrode of first power switch pipe (S1) is connected with the source electrode of second power switch pipe (S2), and the negative pole with the input power supply is connected again.
4, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: first order power inverter adopts the forward conversion mode, its first transformer (T1) and second transformer (T2) are to adopt the voltage resonance degaussing, first resonant capacitance (C1) is connected in parallel between the source electrode and drain electrode of first power switch pipe (S1), and second resonant capacitance (C2) is connected in parallel between the source electrode and drain electrode of second power switch pipe (S2).
5, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: first order power inverter adopts the forward conversion mode, its first transformer (T1) and second transformer (T2) are to adopt the voltage resonance degaussing, first resonant capacitance (C1) is connected in parallel on the former limit winding (Np1) of first transformer (T1), and second resonant capacitance (C2) is connected in parallel on the former limit winding (Np2) of second transformer (T2).
6, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: first order power inverter adopts the forward conversion mode, its first transformer (T1) and second transformer (T2) are to adopt the degaussing of degaussing winding, the first degaussing winding (Nc1) and first transformer (T1) coupling, the anode of the first degaussing winding (Nc1) is connected with the negative electrode of first diode (D1), negative terminal is connected with the positive pole of input power supply, and the anode of first diode (D1) is connected with the negative pole of input power supply; The second degaussing winding (Nc2) and second transformer (T2) coupling, the anode of the second degaussing winding (Nc2) is connected with the negative electrode of second diode (D2), negative terminal is connected with the positive pole of input power supply, and the anode of second diode (D2) is connected with the negative pole of input power supply.
7, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: two secondary rectifying tubes (SR1, SR2) are to adopt the common source connected mode, the gate pole of first rectifying tube (SR1) is connected with the negative terminal of second transformer (T2) secondary winding (Ns 2), and the gate pole of second rectifying tube (SR2) is connected with the negative terminal of first transformer (T1) secondary winding (Ns1); Described isolated converter adopts the forward conversion mode, two secondary rectifying tube (SR1, SR2) be to adopt the common source connected mode, the secondary winding of first transformer (T1) (Ns 1) anode is connected with secondary winding (Ns2) anode of second transformer (T2), anode as low-voltage direct bus (DC BUS), secondary winding (NS1) negative terminal of first transformer (T1) is connected with the drain electrode of first rectifying tube (SR1), secondary winding (NS2) negative terminal of second transformer (T2) is connected with the drain electrode of second rectifying tube (SR2), the source electrode of first rectifying tube (SR1) is connected with the source electrode of second rectifying tube (SR2), as the negative terminal of low-voltage direct bus (DC BUS).
8, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: secondary the one or two rectifying tube (SR1, SR2) is to adopt the common source connected mode, the gate pole of first rectifying tube (SR1) drives winding (Nd2) driving by the secondary of second transformer (T2), and the gate pole of second rectifying tube (SR2) drives winding (Nd1) driving by the secondary of first transformer (T1); Described isolated converter adopts the forward conversion mode, its secondary the one or two rectifying tube (SR1, SR2) be to adopt the common source connected mode, secondary winding (Ns1) anode of first transformer (T1) is connected with secondary winding (NS2) anode of second transformer (T2), anode as low-voltage direct bus (DC BUS), secondary winding (Ns1) negative terminal of first transformer (T1) is connected with the drain electrode of output first rectifying tube (SR1), secondary winding (NS2) negative terminal of second transformer (T2) is connected with the drain electrode of second rectifying tube (SR2), the source electrode of first rectifying tube (SR1) is connected with the source electrode of second rectifying tube (SR2), negative terminal as low-voltage direct bus (DC BUS), the negative terminal that the secondary of second transformer (T2) drives winding (Nd2) is connected with the gate pole of first rectifying tube (SR1), (Nd2) anode is connected with the source electrode of first rectifying tube (SR1), the negative terminal that the secondary of first transformer (T1) drives winding (Nd1) is connected with the gate pole of second rectifying tube (SR2), and anode (Nd1) is connected with the source electrode of second rectifying tube (SR2).
9, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: secondary the one or two rectifying tube (SR1, SR2) is to adopt the common source connected mode, the gate pole of first rectifying tube (SR1) drives winding (Nd1) driving by the secondary of first transformer (T1), and the gate pole of second rectifying tube (SR2) drives winding (Nd2) driving by the secondary of second transformer (T2); Described isolated converter adopts the forward conversion mode, its secondary first rectifying tube (SR1) and second rectifying tube (SR2) are to adopt the common source connected mode, secondary winding (Ns1) anode of first transformer (T1) is connected with secondary winding (NS2) anode of second transformer (T2), anode as low-voltage direct bus (DC BUS), secondary winding (Ns1) negative terminal of first transformer (T1) is connected with the drain electrode of output first rectifying tube (SR1), secondary winding (NS2) negative terminal of second transformer (T2) is connected with the drain electrode of output second rectifying tube (SR2), the source electrode of first rectifying tube (SR1) is connected with the source electrode of second rectifying tube (SR2), negative terminal as low-voltage direct bus (DC BUS), the anode that the secondary of first transformer (T1) drives winding (Nd1) is connected with the gate pole of first rectifying tube (SR1), negative terminal is connected with the source electrode of first rectifying tube (SR1), the anode that the secondary of second transformer (T2) drives winding (Nd2) is connected with the gate pole of second rectifying tube (SR2), and negative terminal is connected with the source electrode of second rectifying tube (SR2).
10, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: secondary first rectifying tube (SR1) and second rectifying tube (SR2) are to adopt the common drain connected mode, the gate pole of first rectifying tube (SR1) drives winding (Nd2) driving by the secondary of second transformer (T2), and the gate pole of second rectifying tube (SR2) drives winding (Nd1) driving by the secondary of first transformer (T1); Described isolated converter adopts the forward conversion mode, its secondary first rectifying tube (SR1) and second rectifying tube (SR2) are to adopt the common drain connected mode, secondary winding (Ns1) anode of first transformer (T1) is connected with the source electrode of output first rectifying tube (SR1), secondary winding (NS2) anode of second transformer (T2) is connected with the source electrode of output second rectifying tube (SR2), the drain electrode of first rectifying tube (SR1) is connected with the drain electrode of second rectifying tube (SR2), anode as low-voltage direct bus (DC BUS), secondary winding (Ns1) negative terminal of first transformer (T1) is connected with secondary winding (NS2) negative terminal of second transformer (T2), negative terminal as low-voltage direct bus (DC BUS), the secondary of second transformer (T2) drives winding (Nd2) negative terminal and is connected with the gate pole of output first rectifying tube (SR1), anode is connected with the source electrode of (SR1), the secondary of first transformer (T1) drives winding (Nd1) negative terminal and is connected with the gate pole of output second rectifying tube (SR2), and anode is connected with the source electrode of (SR2).
11, multi-channel output direct stream/DC converter as claimed in claim 1 or 2, it is characterized in that: secondary first rectifying tube (SR1) and second rectifying tube (SR2) are to adopt the common drain connected mode, the gate pole of first rectifying tube (SR1) drives winding (Nd1) driving by the secondary of first transformer (T1), and the gate pole of second rectifying tube (SR2) drives winding (Nd2) driving by the secondary of second transformer (T2); Described isolated converter adopts the forward conversion mode, its secondary first rectifying tube (SR1) and second rectifying tube (SR2) are to adopt the common drain connected mode, secondary winding (Ns1) anode of first transformer (T1) is connected with the source electrode of output first rectifying tube (SR1), secondary winding (NS2) anode of second transformer (T2) is connected with the source electrode of output second rectifying tube (SR2), the drain electrode of first rectifying tube (SR1) is connected with the drain electrode of second rectifying tube (SR2), anode as low-voltage direct bus (DC BUS), secondary winding (Ns1) negative terminal of first transformer (T1) is connected with secondary winding (NS2) negative terminal of second transformer (T2), negative terminal as low-voltage direct bus (DC BUS), the secondary of first transformer (T1) drives winding (Nd1) anode and is connected with the gate pole of output first rectifying tube (SR1), negative terminal is connected with the source electrode of (SR1), the secondary of second transformer (T2) drives winding (Nd2) anode and is connected with the gate pole of output second rectifying tube (SR2), and negative terminal is connected with the source electrode of (SR2).
12, a kind of multi-channel output direct stream/DC converting method comprises the steps:
Input voltage (Vin) forms the low-voltage direct busbar voltage after by first order Power Conversion, again through second level Power Conversion, the output multipath CD signal, it is characterized in that: described first order Power Conversion is divided into two-way with input voltage (Vin), carry out Power Conversion respectively, produce that two voltage magnitudes are identical, duty ratio is equal to or greater than 50%, the output pulse of phase phasic difference 180 degree, again will described two output superimposed pulses, formation low-voltage direct busbar voltage.
13, multi-channel output direct stream/DC converting method as claimed in claim 12 is characterized in that:, described first order Power Conversion is equal to or greater than 50% by the two-way duty ratio, and the drive signal of phase phasic difference 180 degree is controlled respectively.
14, multi-channel output direct stream/DC converting method as claimed in claim 12 is characterized in that: second level Power Conversion adopts independently output voltage feedback.
15, multi-channel output direct stream/DC converting method as claimed in claim 12, it is characterized in that: the output voltage of second level Power Conversion is set up simultaneously, or by other control circuit the output voltage on each road is controlled settling time.
16, multi-channel output direct stream/DC converting method as claimed in claim 12, it is characterized in that: each road output voltage is regulated separately.
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| CNB021343942A CN1167182C (en) | 2002-07-16 | 2002-07-16 | DC-to-DC converter with several outputs and its conversion method |
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| CNB021343942A CN1167182C (en) | 2002-07-16 | 2002-07-16 | DC-to-DC converter with several outputs and its conversion method |
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| CN103904918B (en) * | 2014-03-05 | 2017-02-08 | 象山元明光电科技有限公司 | Multi-channel self-adaptive power balance output 50 V direct current power source and power control method thereof |
| CN106033885A (en) * | 2015-03-20 | 2016-10-19 | 神华集团有限责任公司 | Direct-current micro-grid power distribution system |
| CN104753357A (en) * | 2015-04-21 | 2015-07-01 | 中国电子科技集团公司第四十三研究所 | Topology circuit of wide-range input voltage isolation type switch power supply and control method of topology circuit |
| CN112436734A (en) * | 2020-11-17 | 2021-03-02 | 天津津航计算技术研究所 | Secondary PWM rectification multi-path output circuit |
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