CN100578902C - Electric power output voltage-operated device - Google Patents
Electric power output voltage-operated device Download PDFInfo
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- CN100578902C CN100578902C CN200710165464A CN200710165464A CN100578902C CN 100578902 C CN100578902 C CN 100578902C CN 200710165464 A CN200710165464 A CN 200710165464A CN 200710165464 A CN200710165464 A CN 200710165464A CN 100578902 C CN100578902 C CN 100578902C
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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Abstract
The present invention relates to a control power technology, in particular to the technology of controlling the power output pressure through controlling the reference pressure of the power. The power output pressure control device includes a power regulating unit, a first resistor and a second resistor, as well as a PWM output module for outputting the PWM wave with set duty ratio on the output terminal; a low band filtering unit connected between the output terminal of the PWM output module and the regulating terminal of the power regulating unit for PWM wave filtering outputted from the PWM output module. The present invention outputs the PWM wave through the PWM output module and rectifies the PWM wave filtering into a direct-current wave through the low band filtering unit. To change the reference pressure of the power through changing the duty ratio of PWM can be multi-level regulation, thus achieving the automatic regulation of the output pressure of the power through regulating the duty ration by a program.
Description
Technical field
The present invention relates to control power technology, relate in particular to a kind of technology of controlling electric power output voltage by control power supply reference voltage.
Background technology
The performance and the input voltage of integrated circuit are closely related, and the variable effect of input voltage is to the sequential of integrated circuit and noise margin etc.For the performance that guarantees integrated circuit satisfies the regulation of device handbook, general manufacturer all can stipulate the bound of integrated circuit input voltage.And, need to adjust the output voltage of power supply for the proof scheme performance meets design requirement in the power source change scope, make it to reach the bound of design.Because the common power circuit can't be adjusted output voltage automatically, when test, all be generally by manual setting, as shown in Figure 1, the output voltage of power supply adjustment unit 110 is represented with Vout, the reference voltage that power supply adjustment unit 110 is adjusted end represents that with Vref then output voltage can be expressed as formula 1:
Vout＝Vref(1+R1/R2) (1)
Thereby during manual setting, can (for example realize by the resistance value of adjusting first resistance 120 and second resistance 130 with slide rheostat, do not show among the figure), reach the purpose that voltage is adjusted, but the testing efficiency of these manual setting means is very low, and can't realize test automatically when large-scale production.
In the prior art, as shown in Figure 2, utilize CPLD (Complicated Programmable LogicalDevice, CPLD), EPLD (Erasable Programmable Logic Device, the electrically erasable logical device) or FPGA (Field Programmable Gate Array, field programmable gate array) exports control voltage, its output comprises three kinds of states, high level, low level or three-state (high-impedance state), correspondence is heightened voltage respectively, turn down and do not adjust, change the reference voltage of the adjustment end of power supply, thereby change the output voltage of power supply.
Particularly, the circuit among Fig. 2 comprises: power supply adjustment unit 201, first resistance 202, second resistance 203 and the 3rd resistance 204 and programmable logic device 205.
Power supply adjustment unit 201 has input, output and adjustment end, first resistance 202 is connected between the adjustment end and output of power supply adjustment unit 201, second resistance 203 is connected between the adjustment end and ground of power supply adjustment unit 201, and the 3rd resistance 204 is connected between the output port of the adjustment end of power supply adjustment unit 201 and programmable logic device 205.
If the output voltage of this circuit of definition is Vout, the reference voltage of power supply adjustment unit adjustment end is Vref, and the control voltage of programmable logic device output is Vcon, and the resistance of first resistance, second resistance and the 3rd resistance is respectively R1, R2 and R3.Then Vout can be expressed as formula 2:
Vout＝Vref(1+R1/R2)-(Vcon-Vref)R1/R3 (2)
Can get by following formula,, just can reach the purpose of adjusting output voltage V out by adjusting, change control voltage Vcon.
The inventor finds, have now when utilizing the programmable logic device control output voltage, because the magnitude of voltage of the output port of programmable logic device output is limited, be generally 3.3V, 2.5V, 5.0V etc., institute be so that power supply also can only be exported several corresponding fixed voltage values, and can't export the magnitude of voltage in the middle of these several magnitudes of voltage.
Summary of the invention
The embodiment of the invention provides a kind of circuit of controlling electric power output voltage, realizes the purpose of multipole adjusting electric power output voltage.
A kind of electric power output voltage-operated device is made up of power supply adjustment unit, first resistance, second resistance, PWM ripple output module and low-pass filter unit, wherein:
Described first resistance is connected between the adjustment end and output of described power supply adjustment unit, and described second resistance is connected between the adjustment end and ground of described power supply adjustment unit;
Described PWM ripple output module is used for the PWM ripple in its output port output setting duty ratio;
Described low-pass filter unit is connected between the adjustment end of the output port of described PWM ripple output module and power supply adjustment unit, is used for the PWM ripple of described PWM ripple output module output is carried out filtering.
The embodiment of the invention is owing to export the PWM ripple by the output port of PWM ripple output module, be the direct current ripple by low-pass filter unit with PWM ripple filter rectification again, remove to regulate the reference voltage of power supply with this direct current ripple, thereby adjusting electric power output voltage, and the duty ratio by routine change PWM ripple to change the reference voltage of power supply automatically can be multistage adjusting, and realized regulating the output voltage that duty ratio is regulated power supply automatically by program.
Description of drawings
Fig. 1 is the electric power output voltage-operated device schematic diagram of prior art;
Fig. 2 is the circuit diagram that the control power supply of prior art changes output voltage;
Fig. 3 a is the theory diagram of the electric power output voltage-operated device of the embodiment of the invention;
Fig. 3 b is the circuit diagram that the control power supply of the embodiment of the invention one changes output voltage;
Fig. 4 is 33% PWM ripple and the waveform schematic diagram of Vref for the duty ratio of the embodiment of the invention one;
Fig. 5 is 67% PWM ripple and the waveform schematic diagram of Vref for the duty ratio of the embodiment of the invention one;
Fig. 6 is the circuit diagram that the control power supply of the embodiment of the invention two changes output voltage;
Fig. 7 is the circuit diagram that the control power supply of the embodiment of the invention three changes output voltage.
Embodiment
The duty ratio of square wave is the high level lasting time of square wave in the one-period and the ratio in the cycle of square wave, and the duty ratio of PWM ripple is adjustable, that is to say, can adjust the duration of PWM ripple each cycle time of interior high level.If it is big that the duty ratio of PWM ripple becomes, mean that then the duration of high level in one-period time of waveform is elongated, corresponding, low duration shortens; If the duty ratio of PWM ripple diminishes, mean that then the duration of the interior high level of one-period time of waveform shortens, corresponding, low duration is elongated.
Based on this, shown in Fig. 3 a, the embodiment of the invention is controlled electric power output voltage by PWM ripple output module and low-pass filter unit, output port output PWM (the PulseWidth Modulation of PWM ripple output module, pulse width modulation) ripple, is the direct voltage ripple by low-pass filter unit with PWM ripple filter rectification, use this direct voltage ripple to remove to control the reference voltage of power supply, adjust the duty ratio of the PWM ripple of PWM ripple output module output by corresponding program, can change the average voltage of direct voltage ripple, thereby reach the purpose of regulating electric power output voltage, and, realized the automatic adjusting of electric power output voltage by the duty ratio that program is regulated the PWM ripple.
The embodiment of the invention one, two, three provides three kinds of different low-pass filter units respectively, and regulates the circuit of electric power output voltage by PWM ripple output module and low-pass filter unit.
Embodiment one
Shown in Fig. 3 b, a kind of electric power output voltage-operated device that embodiment one provides comprises: power supply adjustment unit 301, low-pass filter unit 308, first resistance 302, second resistance 303 and PWM ripple output module 307.
Power supply adjustment unit 301 comprises input, output and adjustment end, the input of power supply adjustment unit 301 links to each other with power supply, give the power supply adjustment unit 301 power supplies, power supply adjustment unit 301 is exported the supply power voltage of correspondent voltage as the circuit that is powered according to the input voltage of adjusting end from output.
First resistance 302 and second resistance 303 are as the peripheral circuit of power supply adjustment unit 301.First resistance 302 is connected between the adjustment end and output of power supply adjustment unit 301, and second resistance 303 is connected between the adjustment end and ground of power supply adjustment unit 301.
The output port output PWM ripple of PWM ripple output module 307.PWM ripple output module 307 can be that programmable logic device also can be processor or single-chip microcomputer, and described programmable logic device can comprise CPLD, EPLD or FPGA etc.PWM ripple output module 307 can be by the variable PWM ripple of program control output port output duty cycle.
Low-pass filter unit 308 comprises resistance R y304, resistance R x306 and capacitor C x305.Low-pass filter unit 308 is connected between the output port of the adjustment end of power supply adjustment unit 301 and PWM ripple output module 307, and the PWM ripple filter rectification that is used for the output port output of PWM ripple output module 307 is the direct current ripple.In this low-pass filter unit 308, resistance R y304 and resistance R x306 are connected in series with between the output port of the adjustment end of power supply adjustment unit 301 and PWM ripple output module 307, capacitor C x305 one end is connected with ground, and the other end links to each other with the common connection end of resistance R x306 with resistance R y304.
The PWM ripple of the EDM Generator of Adjustable Duty Ratio of the output port output by changing PWM ripple output module 307 is controlled the process of change in voltage of the output output of power supply adjustment unit 301, and is as described below:
Analyze situation earlier when the output port output direct current ripple of PWM ripple output module 307, suppose the output port output dc voltage of PWM ripple output module 307, its effective value is Vcon, the effective value Vcon of the direct voltage of the output port output of change PWM ripple output module 307, Vout will change thereupon so, specifically as shown in Equation 3:
Wherein, R1 is the resistance value of first resistance 302, and R2 is the resistance value of second resistance 303.
So, when the output port output duty cycle of PWM ripple output module 307 is 50% PWM ripple, this ripple through low-pass filter unit filtering after, its voltage effective value Vcon will obtain effect and be equivalent to half direct voltage of PWM wave height level.At this moment just be equivalent to change Vout with half direct voltage Vcon of the high level of PWM ripple.
Particularly, when the output port of PWM ripple output module 307 output PWM ripple,,, the PWM ripple filter of output is the dc waveform near the effective value Vcon of PWM ripple by the filter action of low-pass filter unit 308 to capacitor C x305 charge and discharge.Certainly, this dc waveform is not the direct current on the absolute sense, and it also can have certain ripple fluctuation, but totally remains the magnitude of voltage that is equivalent to Vcon on time-domain.When the PWM ripple of the output port of PWM ripple output module 307 output is high level (being direct impulse), capacitor C x305 charging; When the PWM ripple of the output port of PWM ripple output module 307 output is low level (negative-going pulse), capacitor C x305 discharge.
If the duty ratio of the PWM ripple of the output port output of adjusting PWM ripple output module 307, such as the duty ratio of being transferred to 20%, because the direct impulse ratio in the PWM ripple reduces, the negative-going pulse ratio has increased, the charging interval of capacitor C x305 reduces, increase discharge time, the Vcon effective value reduces, can reduce by the filtered magnitude of voltage of low-pass filter unit, the voltage of the reference voltage Vref of the adjustment end of power supply adjustment unit 301 also can reduce accordingly, causes the output voltage V out voltage of the output of power supply adjustment unit 301 also to reduce.
Otherwise, if heighten the duty ratio of PWM ripple, such as being transferred to 80%, at this moment, direct impulse ratio in the PWM ripple increases, the negative-going pulse ratio reduces, and the charging interval of capacitor C x305 increases, and reduce discharge time, the Vcon effective value increases, can raise by low-pass filter unit 308 filtered magnitudes of voltage, the voltage of the reference voltage Vref of the adjustment end of power supply adjustment unit 301 also can raise accordingly, causes the output voltage V out voltage of the output of power supply adjustment unit 301 also to raise.
So realized the purpose that the duty of the PWM ripple of the output port output by changing PWM ripple output module 307 is recently regulated the Vout output voltage.Owing to pass through the PWM ripple of the output port output of programmable logic device, single-chip microcomputer or processor, the duty ratio of this PWM ripple is to regulate by the value of preserving in the duty cycle register in the PWM output unit that changes programmable logic device, single-chip microcomputer or processor, and register is more than 8 usually at least, that is to say that the adjusting numerical value of duty ratio has 2 at least
8=256, according to the duty ratio of at least 256 PWM ripples, can adjust at least 256 Vcon voltages so, also just adjust 256 Vout output voltages accordingly.This has the more magnitude of voltage of multistage variable than regulating by several limited direct voltages (as 5V, 3.3V, 2.8V etc.) in the prior art.So, realized the multistage adjustable of Vout output voltage by the duty ratio of regulating the PWM ripple.At this moment, the voltage change value of Vout output voltage can be far away more than the change value of the Vout output voltage of regulating by the output port output dc voltage mode of programmable logic device in the prior art.
As shown in Figure 4, be 33% PWM ripple and the voltage wave schematic diagram of Vref for duty ratio; Fig. 5 is 67% PWM ripple and the voltage wave schematic diagram of Vref for duty ratio.
As can be seen, for the big more PWM ripple of duty ratio, the voltage of Vref is then high more; Otherwise the voltage of Vref is low more.Like this, just can reach and regulate direct voltage Vcon, and then change the reference voltage Vref of the adjustment end of power supply adjustment unit 301, make the purpose that the output voltage V out of output of power supply adjustment unit 301 changes by regulating the duty ratio of PWM ripple.
Wherein, low-pass filter unit 308 and PWM ripple output module 307 have been formed the reference power source generating apparatus, are used to change the reference voltage that power supply adjustment unit 301 is adjusted end.
The embodiment of the invention is by changing the duty ratio of PWM ripple, thereby changed direct voltage to obtaining behind this PWM ripple filter rectification, and change the reference voltage of power supply adjustment unit with this direct voltage, thereby change the technology of the output voltage of power supply adjustment unit, make the variation progression of output voltage of power supply adjustment unit increase greatly, can adapt to more voltage supply occasion.
The embodiment of the invention is owing to adopt the output voltage that comes regulating and controlling power supply adjustment unit by the adjustable PWM ripple of the output port output duty cycle of PWM ripple output module, so when needs change the output voltage of power supply adjustment unit, need not the manual setting resistance value, only need to finish adjustment and change automatically, improved the efficient of adjusting output voltage output voltage by the change of program.
Embodiment two
The embodiment of the invention provides a kind of circuit of controlling the supply voltage output area as shown in Figure 6, comprising: power supply adjustment unit 601, low-pass filter unit 607, first resistance 602, second resistance 603 and PWM ripple output module 606.
Power supply adjustment unit 601 comprises input, output and adjustment end, the input of power supply adjustment unit 601 links to each other with power supply, give the power supply adjustment unit 601 power supplies, power supply adjustment unit 601 is exported the supply power voltage of correspondent voltage as the circuit that is powered according to the input voltage of adjusting end from output.
First resistance 602 and second resistance 603 are as the peripheral circuit of power supply adjustment unit 601.First resistance 602 is connected between the adjustment end and output of power supply adjustment unit 601, and second resistance 603 is connected between the adjustment end and ground of power supply adjustment unit 601.
The output port output PWM ripple of PWM ripple output module 606, PWM ripple output module 606 can be controlled the duty ratio of the PWM ripple of this output port output.
Resistance R x604, capacitor C x605 and capacitor C y608 form low-pass filter unit 607, be connected between the output port of the adjustment end of power supply adjustment unit 601 and PWM ripple output module 606, the PWM ripple filter rectification that is used for the output port output of PWM ripple output module 606 is the direct current ripple.In this low-pass filter unit 607, resistance R x604 is connected between the output port of the adjustment end of power supply adjustment unit 601 and PWM ripple output module 606, capacitor C x605 is connected between the output port and ground of PWM ripple output module 606, and capacitor C y608 is connected between the adjustment end and ground of power supply adjustment unit 601.
With embodiment one similarly, after the low-pass filter unit 607 that resistance R x604 and capacitor C x605 form can be the direct current ripple with the PWM ripple filter rectification that the output port of PWM ripple output module 606 is exported, in order to the voltage of control Vref, make the power supply adjustment unit change the output voltage of output.
Wherein, low-pass filter unit 607 and PWM ripple output module 606 have been formed the reference power source generating apparatus, are used to change the reference voltage that power supply adjustment unit 601 is adjusted end.
The embodiment of the invention is by changing the duty ratio of PWM ripple, thereby changed direct voltage to obtaining behind this PWM ripple filter rectification, and change the reference voltage of power supply adjustment unit with this direct voltage, thereby change the technology of the output voltage of power supply adjustment unit, make the variation progression of output voltage of power supply adjustment unit increase greatly, can adapt to more voltage supply occasion.
The embodiment of the invention is owing to adopt the output voltage that comes regulating and controlling power supply adjustment unit by the adjustable PWM ripple of the output port output duty cycle of PWM ripple output module, so when needs change the output voltage of power supply adjustment unit, need not the manual setting resistance value, only need to finish adjustment and change automatically, improved the efficient of adjusting output voltage output voltage by the change of program.
Embodiment three
The embodiment of the invention provides a kind of circuit of controlling the supply voltage output area as shown in Figure 7, comprising: power supply adjustment unit 701, low-pass filter unit 707, first resistance 702, second resistance 703 and PWM ripple output module 706.
Power supply adjustment unit 701 comprises input, output and adjustment end, the input of power supply adjustment unit 701 links to each other with power supply, give the power supply adjustment unit 701 power supplies, power supply adjustment unit 701 is exported the supply power voltage of correspondent voltage as the circuit that is powered according to the input voltage of adjusting end from output.
The output port output PWM ripple of PWM ripple output module 706, PWM ripple output module 706 can be controlled the duty ratio of the PWM ripple of this output port output.
Resistance R x704 and capacitor C x705 form low-pass filter unit 707, are connected between the output port of power supply adjustment unit 701 and PWM ripple output module 706, and the PWM ripple filter rectification that is used for the output port of PWM ripple output module 706 is exported is the direct current ripple.In this low-pass filter unit 707, resistance R x704 is connected between the output port of the adjustment end of power supply adjustment unit 701 and PWM ripple output module 706, and capacitor C x705 is connected between the adjustment end and ground of power supply adjustment unit 701.
With embodiment one similarly, the PWM ripple filter rectification that the low-pass filter unit 707 that resistance R x704 and capacitor C x705 form can be exported the output port of PWM ripple output module 706 is the direct current ripple, in order to the voltage of control Vref, make the power supply adjustment unit change the output voltage of output.
Wherein, low-pass filter unit 707 and PWM ripple output module 706 have been formed the reference power source generating apparatus, are used to change the reference voltage that power supply adjustment unit 701 is adjusted end.
The embodiment of the invention is by changing the duty ratio of PWM ripple, thereby changed voltage to the direct current that obtains behind this PWM ripple filter rectification, and change the reference voltage of power supply adjustment unit with this voltage, thereby change the technology of the output voltage of power supply adjustment unit, make the variation progression of output voltage of power supply adjustment unit increase greatly, can adapt to more voltage supply occasion.
The embodiment of the invention is owing to adopt the output voltage that comes regulating and controlling power supply adjustment unit by the adjustable PWM ripple of the output port output duty cycle of PWM ripple output module, so when needs change the output voltage of power supply adjustment unit, need not the manual setting resistance value, only need to finish adjustment and change automatically, improved the efficient of adjusting output voltage output voltage by the change of program.
The PWM ripple output module of above embodiment can be in circuit board adds a PWM ripple output function in existing logical device or the processor to be realized, and low-pass filter unit mainly is to be made of resistance, electric capacity, it is a power adjustment scheme that cost is very cheap, realize the method that multilevel voltage is regulated with respect to other, as adopting digital to analog converter to export the method for adjustable voltage, cost is lower.
Above embodiment can also have following beneficial effect in different application scenarios:
When on-the-spot veneer breaks down, and this fault mainly causes owing to supply power voltage is improper, then can pass through upgraded version reprogramming at the scene, the duty ratio of fine setting PWM ripple, and then finely tuned the output voltage of power supply adjustment unit, thus provide suitable voltage to veneer, improved the stability and the reliability of system like this, and avoided returning veneer and keeped in repair, saved the cost that returns maintenance.
In the process of production in enormous quantities and testing single-board, can regulate the duty ratio of PWM ripple by software automatically, thereby regulated the output voltage of power supply adjustment unit, can be so that the supply power voltage of veneer be adjusted to the arbitrary value in the voltage extremity scope automatically, whether the performance of observing with the integrated circuit that detects veneer meet the demands, and improved in the high volume production process testing efficiency to veneer products.
When veneer is debugged, can pass through the duty ratio of software adjustment PWM ripple, thereby change the output voltage of power supply adjustment unit, just changed the supply power voltage of veneer, increased debugging method.
Those skilled in the art can realize that easily other changes the low-pass filter unit of kind according to the disclosed technology of the embodiment of the invention, realize the filter rectification to the PWM ripple, thereby regulate the reference voltage of power supply, reach the purpose of regulating electric power output voltage.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1, a kind of electric power output voltage-operated device is characterized in that, form by power supply adjustment unit, first resistance, second resistance, PWM ripple output module and low-pass filter unit, wherein:
Described first resistance is connected between the adjustment end and output of described power supply adjustment unit, and described second resistance is connected between the adjustment end and ground of described power supply adjustment unit;
Described PWM ripple output module is used for the PWM ripple in its output port output setting duty ratio;
Described low-pass filter unit is connected between the adjustment end of the output port of described PWM ripple output module and power supply adjustment unit, is used for the PWM ripple of described PWM ripple output module output is carried out filtering;
Described low-pass filter unit comprises:
The 5th resistance is connected between the output port of the adjustment end of described power supply adjustment unit and described PWM ripple output module;
Second electric capacity is connected between the adjustment end and ground of described power supply adjustment unit.
2, device as claimed in claim 1 is characterized in that, described low-pass filter unit also comprises:
The 3rd resistance, an end connect the tie point of described first resistance and described second resistance, and the other end connects the tie point of described the 5th resistance and described second electric capacity.
3, device as claimed in claim 1 is characterized in that, described low-pass filter unit also comprises:
The 3rd electric capacity is connected between the output port and ground of described PWM ripple output module.
4, device as claimed in claim 1 is characterized in that, described PWM ripple output module is complex programmable logic device (CPLD), electrically erasable logical device EPLD, on-site programmable gate array FPGA or single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710165464A CN100578902C (en) | 2007-10-29 | 2007-10-29 | Electric power output voltage-operated device |
| PCT/CN2008/072852 WO2009059527A1 (en) | 2007-10-29 | 2008-10-28 | A generating device of reference electrical source and a voltage output control device of electrical source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710165464A CN100578902C (en) | 2007-10-29 | 2007-10-29 | Electric power output voltage-operated device |
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| CN101174791A CN101174791A (en) | 2008-05-07 |
| CN100578902C true CN100578902C (en) | 2010-01-06 |
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| CN100578902C (en) * | 2007-10-29 | 2010-01-06 | 华为技术有限公司 | Electric power output voltage-operated device |
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2008
- 2008-10-28 WO PCT/CN2008/072852 patent/WO2009059527A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2009059527A1 (en) | 2009-05-14 |
| CN101174791A (en) | 2008-05-07 |
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