CN1504852A - Stabilized voltage type multichannel pulsewave width modulating converter - Google Patents
Stabilized voltage type multichannel pulsewave width modulating converter Download PDFInfo
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- CN1504852A CN1504852A CNA021526583A CN02152658A CN1504852A CN 1504852 A CN1504852 A CN 1504852A CN A021526583 A CNA021526583 A CN A021526583A CN 02152658 A CN02152658 A CN 02152658A CN 1504852 A CN1504852 A CN 1504852A
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Abstract
A voltage stabilization multiple channel pulse wave width modification converter which comprises at least, a power supply output end, an error amplifier, and a plurality of conversion channels in multiple-connection between the error amplifier and the power supply output end, which uses the converter voltage difference signal as input for exporting a plurality of direct current power supplies to form voltage stabilization direct current power supply, each conversion channel has a current flow detector for measuring the current value of the conversion channels, to produce a channel current signal, and to feedback channel current signal to regulate the value of output voltage of the conversion channel.
Description
(1) technical field
The relevant a kind of power supply changeover device of the present invention, particularly relevant a kind of type voltage regulation hyperchannel pulse wave width modulation converter.
(2) background technology
Along with the demand of computer of new generation to high speed, high electric current, the electric current demand of the microprocessor (Microprocessor) of especially up-to-date PC (PC) has surpassed 60 amperes (A), so the current requirements of DC-DC converter is also more and more higher.Therefore, the framework of multichannel parallel converter just often is cited.Wherein, the multichannel converter of heterogeneous formula form more because the peptizaiton of current ripple (Ripple) of input and output, and can adopt less, more cheap filter capacitor.
The parallel converter of hyperchannel is to utilize several pulse wave width modulations with identical output voltage (Pulse-width Modulated; PWM) ALT-CH alternate channel with its output terminal parallel connection, provides higher output current.In several passages,, make one or more passages can bear to disproportion higher load because inevitably a little asymmetric between each passage.What is more, if each passage is for having synchronous rectification (Synchronous rectified) form of absorption (Sinking) and supply (Sourcing) current capacity, huge idle current, just may flow into the low passage of voltage from the high passage of voltage, cause extra power consumption, and the uneven work of the power component that causes each passage undertakes, so the specified tolerance specification of power component just need be improved, thereby increased the cost of converter.And if be responsible for all loads by the passage of minority, and not only cause heat to concentrate, its life-span also can shorten, because the increase of working temperature, just the mean lifetime of assembly can reduce.Therefore, in the parallel converter of hyperchannel, must possess the system of each channel current of energy balance, each ALT-CH alternate channel all be worked, under the same channels electric current to avoid above-mentioned problem.
Known converter is that the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known passive step-down as Fig. 1.Be to utilize a plurality of independently PWM ALT-CH alternate channels, and, make the output voltage of each ALT-CH alternate channel increase and reduce, and reach the purpose of mean allocation load current along with electric current at the output terminal of each ALT-CH alternate channel dropping resistor that is coupled.The method circuit is simple, but shortcoming is the extra power consumption of increase, and the output voltage of converter can and descend along with the electric current increase.As shown in FIG., error amplifier 201a, 201b, the VREF that is input as of 201c reaches by detecting position 205a, 205b, the magnitude of voltage that 205c is obtained, relatively after both difference, control pulse wave width modulation device 202a, 202b, the work period of 202c is also again by control pulse wave width modulation device 202a, 202b, the output of 202c comes power controlling switch 203a, 203b, 203c.The power supply that will produce the pulse wave formula this moment is through inductance 204a, and 204b is after 204c and electric capacity 208 filtering, and at dropping resistor 206a, 206b, 206c produces a voltage drop that is directly proportional with each channel current, with the size of current of each ALT-CH alternate channel of balance, the output DC source is to load 207 then.Wherein, output voltage detect position 205a, 205b, 205c are between inductance 204a, 204b, 204c and resistance 206a, 206b is between the 206c.
Be that the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known active step-down as Fig. 2 in addition, the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in its passive type step-down that improves among Fig. 1.Be to utilize the channel current size that detects each ALT-CH alternate channel, downgrade the input reference voltage value of each ALT-CH alternate channel again according to the channel current size, make the electric current output of each ALT-CH alternate channel of balance.This kind converter has improved the problem that the converter power among Fig. 1 consumes, but still has output voltage to increase and the shortcoming of decline along with load current.As shown in FIG., the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known active step-down, utilizes subtraction circuit 301a, 301b, and 301c is with V
REF Deduct detecting device 306a, 306b, 306c detects the channel current signal of gained to revise the input reference voltage of each passage, is sent to error amplifier 302a, 302b, 302c is more relatively from detecting position 307a, 307b, the output voltage signal that 307c obtains produces and revises the back reference voltage, control pulse wave width modulation device 303a, 303b, makes power switch 304a at the work period of 303c, 304b, 304c out-put supply pulse wave is again through inductance 305a, 305b, 305c and electric capacity 309 filtering export load 308 to.
By above-mentioned explanation as can be known, the parallel direct current transducer of known hyperchannel, when load current increases, inputing to after the correction of each passage reference voltage therefore can downgrade and make that output voltage can be along with decline, so how simple and easy and electric current of effective each passage of balance, and can not reduce output voltage, make converter that required power supply can more stablely be provided, for multichannel converter develops an important directions.
(3) summary of the invention
In above-mentioned background of invention, because the electric current demand of new PC microprocessor increases day by day, so need to provide the converter of big electric current.The invention provides a kind of multichannel power supply changeover device, simple and easy and effective with load current average be dispensed to each ALT-CH alternate channel, and can not influence the height of its output voltage, and can the needs when using adjust the quantity of ALT-CH alternate channel because of the size of electric current.
One of fundamental purpose of the present invention provides a kind of type voltage regulation hyperchannel pulse wave width modulation converter, has the function of burning voltage output and each channel current of balance.
Another object of the present invention provides a kind of according to actual user demand, opens or close the power supply changeover device of ALT-CH alternate channel.
According to above-described purpose, type voltage regulation hyperchannel pulse wave width modulation converter of the present invention comprises an error amplifier, is input with the average output voltage of reference voltage and converter, and its difference relatively is to control the voltage output of a plurality of ALT-CH alternate channels.Wherein each ALT-CH alternate channel includes subtraction circuit, output signal with error amplifier is input, deduct the channel current signal that is proportional to this passage output current, control the work period of pulse wave width modulation device, and then make power switch produce the output of pulse wave power supply.This pulse wave power supply output is through filter element, the required electric current of offered load after the filtering, and because be the error amplifier output signal that inputs to each passage, need deduct each channel current signal as correction, therefore the work period of each passage just can ratio downgrade according to the size of channel current, reaches the purpose of each channel current of balance.And the whole output voltage of converter takes back error amplifier, forms backfeed loop, is benchmark with the reference voltage, adjusts error amplifier output signal, and the output voltage of all passages is adjusted, and equals reference voltage to keep output voltage.Current detector, the channel current size of detection ALT-CH alternate channel, output channel size of current signal is to above-mentioned subtraction circuit.And wherein aforesaid current detector can utilize resistance polyphone inductance, to measure size of current, perhaps can utilize the conducting resistance of power switch, measures size of current.Type voltage regulation hyperchannel pulse wave width modulation converter of the present invention can be opened and close the quantity of ALT-CH alternate channel according to user demand, and be had the mechanism of self-poise channel current.
(4) description of drawings
Preferred embodiment of the present invention will be aided with following figure in comment backward sets forth in more detail, wherein:
Fig. 1 is that the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known passive step-down;
Fig. 2 is that the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known active step-down; And
Fig. 3 is a type voltage regulation hyperchannel pulse wave width modulation converter of the present invention.
(5) embodiment
By in the background of invention as can be known, the electric current demand of new PC microprocessor has surpassed 60 amperes, so needs can provide the DC-DC converter of big electric current.The framework of hyperchannel converter in parallel is because the peptizaiton of the current ripple of input and output can adopt less, more cheap filter capacitor.But known converter is because inevasible asymmetrical voltage makes one or more passages can bear to disproportion load, form extra power consumption, the specified tolerance specification of power component must be improved, thereby increased cost, and its life-span also can shorten.But the parallel direct current transducer of weighing apparatus formula hyperchannel is transferred in known step-down, though each passage of converter is worked under the same channels electric current, to avoid aforesaid problem.But can output voltage be descended.How can provide multichannel power supply changeover device, simple and easy and effective with load current average be dispensed to each ALT-CH alternate channel, and can not reduce output voltage because load current increases, provide important contribution in fact to multichannel power supply changeover device.
Converter of the present invention is the many groups ALT-CH alternate channel that utilizes parallel connection, the output current of each ALT-CH alternate channel wherein, all utilize detecting device to be detected, and follow according to the measured signal that is proportional to passage output current size of detecting device, ratio reduces the work period (Duty Cycle) of pulse wave width modulation device, make the output voltage of this passage thereby downgrade, with the size of current of each ALT-CH alternate channel of balance according to the channel current size.Utilize whole output voltage to feed back to error amplifier (Error Amplifier again; E/A) a input end, another input end is a reference voltage, form a negative feedback loop (Negative feedbackloop) with this, when whole output voltage during less than reference voltage, improve and to add all error amplifier output signals, promoting whole output voltage, add all error amplifier output signals in all passages when output voltage reduces during greater than reference voltage in all passages, to downgrade whole output voltage, make the value of whole output voltage stabilization in reference voltage.
As shown in Figure 3, be type voltage regulation hyperchannel pulse wave width modulation converter of the present invention.An input end of error amplifier 401 is V as shown in FIG.
REF, it is the reference voltage of a standard, with the canonical reference voltage as converter output voltage.Another input end of error amplifier 401 is the output voltage of whole converter, and error amplifier 401 is the difference of output voltages and reference voltage relatively, produces output VE/A, and when output voltage during greater than reference voltage, VE/A just can reduce.When output voltage during less than reference voltage, VE/A just can increase.And VE/A promotes follow-up pulse wave width modulation ALT-CH alternate channel 402a again, 402b, 402c, the power supply output that produces whole converter.
Be example with the pulse wave width modulation ALT-CH alternate channel 402a in scheming again, as shown in FIG., each pulse wave width modulation ALT-CH alternate channel includes subtraction circuit 405, pulse wave width modulation device 406, power switch 407, inductance 408 and detecting device 409.Behind VE/A input pulse wave width modulation ALT-CH alternate channel, form a positive input of subtraction circuit 405, its channel current signal subtraction measured with detecting device 409 again and the ALT-CH alternate channel that obtains, form the input signal of pulse wave width modulation device 406, the input of pulse wave width modulation device 406 standard of comparison triangular waves, the work period of the pulse wave output of decision pulse wave width modulation device 406, again with the follow-up power switch 407 of this pulse wave output control, and the output that produces a pulse wave power supply.And above-mentioned channel current signal is proportional to the size of current of ALT-CH alternate channel, so when this channel current is big, the output that makes the subtraction circuit of this passage is reduced more, and then it is more that 406 work periods of pulse wave width modulation device are reduced, and channel current is reduced.And the pulse wave power supply is again after inductance 408 and electric capacity 410 filtering, and the galvanic current source that forms exports load 403 to.Wherein above-mentioned detecting device 409 can be a resistance, be connected in inductance 408 to measure the channel current size of this ALT-CH alternate channel, perhaps also can utilize a conducting resistance of power switch 407 to measure the size of current of this ALT-CH alternate channel, it does not all break away from spirit of the present invention and scope.
Type voltage regulation hyperchannel pulse wave width modulation converter of the present invention, with a plurality of ALT-CH alternate channels that have according to channel current size adjustment output voltage, and adjust whole output voltage with a negative feedback loop, make formation one have the hyperchannel pulse wave width modulation converter of regulated output voltage, not only improve known converter, because the demand of each passage output current of balance, and the shortcoming that makes output voltage rise and to descend because of output current.Converter of the present invention, more because of each ALT-CH alternate channel all tool adjust the independent loop of size of current automatically, and interactive signal that need not be to each other, make the automatic number that adapts to different ALT-CH alternate channels in parallel of output current of each ALT-CH alternate channel in parallel, so can open or close ALT-CH alternate channel according to actual user demand, and need not do other modification to circuit, a stable output current is provided.
Understand as the person skilled in the art, the above only is preferred embodiment of the present invention, is not in order to limit claim of the present invention; All other do not break away from equivalence change or the equivalence finished under the disclosed spirit to be replaced, and all should be included in the following claim institute restricted portion.
Claims (9)
1. a type voltage regulation hyperchannel pulse wave width modulation converter is characterized in that, comprises at least:
One power output end is exported a constant voltage dc source, and an average output voltage signal is provided;
One error amplifier is input with a reference voltage signal and this average output voltage signal, and relatively the difference of this reference voltage signal and this average output voltage signal produces transducer voltage difference signal output; And
Several ALT-CH alternate channels, be connected in parallel between this error amplifier and this power output end, with this transducer voltage difference signal is input, export several direct supplys, to constitute this constant voltage dc source, each this ALT-CH alternate channel has the channel current size that a current detector is measured this ALT-CH alternate channel, produces a channel current signal, and feeds back this channel current signal to adjust the output voltage size of this ALT-CH alternate channel.
2. converter as claimed in claim 1 is characterized in that, described ALT-CH alternate channel also comprises:
One subtraction circuit is connected in the output terminal of this error amplifier, is input with this transducer voltage difference signal, deducts this channel current signal, and back voltage differences signal is revised in output one;
One pulse wave width modulation device is input with this a correction back voltage differences signal and a standard triangular wave, adjusts the work period of this pulse wave width modulation device, exports a pulse wave width modulation signal;
One power switch is connected in this pulse wave width modulation device, is input with this pulse wave width modulation signal, controls this power switch, to produce pulse wave power supply output; And
One filter element comprises an inductance and an electric capacity, and this filter element is connected in this power switch, with this pulse wave power filter, forms this direct supply output;
This current detector of this ALT-CH alternate channel wherein detects the channel current size of this ALT-CH alternate channel, produces this channel current signal, and exports this channel current signal to this subtraction circuit.
3. converter as claimed in claim 1 is characterized in that, described current detector utilizes a resistance this inductance of contacting, to measure the channel current size of this ALT-CH alternate channel.
4. converter as claimed in claim 1 is characterized in that, described current detector utilizes a conducting resistance of this power switch, to measure the channel current size of this ALT-CH alternate channel.
5. converter as claimed in claim 1 is characterized in that, described several ALT-CH alternate channels are opened and closed according to user demand, and have the balancing of automatic adjustment channel current.
6. a type voltage regulation hyperchannel pulse wave width modulation converter is characterized in that, comprises at least:
One power output end is exported a constant voltage dc source, and an average output voltage signal is provided;
One error amplifier is input with a reference voltage signal and this average output voltage signal, and relatively the difference of this reference voltage signal and this average output voltage signal produces transducer voltage difference signal output; And
Several ALT-CH alternate channels, parallel being connected between this error amplifier and this power output end is input with this transducer voltage difference signal, exports several direct supplys, to constitute this constant voltage dc source, wherein each those ALT-CH alternate channel also comprises:
One subtraction circuit, being connected in the output terminal of this error amplifier, is input with this transducer voltage difference signal, deducts the input of a channel current signal, back voltage differences signal is revised in output one, and wherein this channel current signal is the channel current size that is proportional to this ALT-CH alternate channel;
One pulse wave width modulation device is input with this a correction back voltage differences signal and a standard triangular wave, adjusts the work period of this pulse wave width modulation device, exports a pulse wave width modulation signal;
One power switch is connected in this pulse wave width modulation device, is input with this pulse wave width modulation signal, controls this power switch, to produce pulse wave power supply output;
One filter element comprises an inductance and an electric capacity, and this filter element is connected in this power switch, with this pulse wave power filter, forms this direct supply output; And
One current detector detects the channel current size of this ALT-CH alternate channel, exports this channel current signal to this subtraction circuit.
7. converter as claimed in claim 6 is characterized in that, described current detector utilizes a resistance this inductance of contacting, to measure the channel current size of this ALT-CH alternate channel.
8. converter as claimed in claim 6 is characterized in that, described current detector utilizes a conducting resistance of this power switch, to measure the channel current size of this ALT-CH alternate channel.
9. converter as claimed in claim 6 is characterized in that, described several ALT-CH alternate channels are opened and closed according to user demand, and have the balancing of automatic adjustment channel current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021526583A CN1504852A (en) | 2002-11-28 | 2002-11-28 | Stabilized voltage type multichannel pulsewave width modulating converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021526583A CN1504852A (en) | 2002-11-28 | 2002-11-28 | Stabilized voltage type multichannel pulsewave width modulating converter |
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| CN1504852A true CN1504852A (en) | 2004-06-16 |
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| CNA021526583A Pending CN1504852A (en) | 2002-11-28 | 2002-11-28 | Stabilized voltage type multichannel pulsewave width modulating converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100521475C (en) * | 2004-09-10 | 2009-07-29 | 半导体元件工业有限责任公司 | Method of forming a multi-phase power supply controller |
| CN101727121B (en) * | 2004-07-28 | 2013-07-10 | 半导体元件工业有限责任公司 | Power supply control system and method for forming power supply controller |
-
2002
- 2002-11-28 CN CNA021526583A patent/CN1504852A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727121B (en) * | 2004-07-28 | 2013-07-10 | 半导体元件工业有限责任公司 | Power supply control system and method for forming power supply controller |
| CN100521475C (en) * | 2004-09-10 | 2009-07-29 | 半导体元件工业有限责任公司 | Method of forming a multi-phase power supply controller |
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