CN201197114Y - Pulse width modulation structure with regulation work period - Google Patents
Pulse width modulation structure with regulation work period Download PDFInfo
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- CN201197114Y CN201197114Y CNU2008200041073U CN200820004107U CN201197114Y CN 201197114 Y CN201197114 Y CN 201197114Y CN U2008200041073 U CNU2008200041073 U CN U2008200041073U CN 200820004107 U CN200820004107 U CN 200820004107U CN 201197114 Y CN201197114 Y CN 201197114Y
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Abstract
The utility model relates to a pulse width modulating frame having an adjustable work cycle. The pulse width modulating frame comprises a direct current supplying unit, a signal generating unit, a voltage-dividing resistor unit, a reference voltage unit, and a comparing unit. When the direct current supplying unit supplies a voltage signal for the voltage-dividing resistor unit, the voltage-dividing resistor unit receives the voltage signal and transmits the voltage signal to the signal generating unit after setting a voltage level, so that a waveform signal generated by the signal generating unit adjusts the voltage level according to the voltage signal, then the comparing unit compares the received signal of the signal generating unit with a signal of the reference voltage unit, and outputs a comparing signal to drive a fan motor to move, so that the output signal has comparatively liner smoothing effect.
Description
Technical field
The utility model relates to a kind of pulse width modulation framework, particularly be a kind of pulse width modulation framework of adjusting the work period that has.
Background technology
Pulse-width modulation (Pulse width modulation is called for short PWM) is to utilize the numeral of microprocessor to export a kind of very effective technology that analog circuit is controlled, and is widely used in from measurement, communication to many fields of power control and conversion.
Existing pulse width modulation (Pulse width modulation, hereinafter to be referred as PWM) circuit, see also Fig. 1, Fig. 2, shown in Fig. 3 A, it is to be applied on the fan motor device (not shown), pwm circuit is to comprise a direct current power supply device 110, one divider resistance device 120, one comparison means 130 and a signal generation device 140, wherein said DC power supply 110 is a variable DC voltage source Vin (as: 2～5 volts), and in order to provide voltage source to divider resistance device 120, and described divider resistance device 120 is respectively equipped with one first resistor assembly R7 and one second resistor assembly R8, and the described first resistor assembly R7 couples mutually with the described second resistor assembly R8, be provided with a first node voltage Vr therebetween, wherein the magnitude of voltage of divider resistance device 120 also can be along with magnitude of voltage that DC power supply 110 provided and is changed; And signal generation device 140 is to can be a triangular wave generator 141, and can be in order to producing a triangular signal, and high potential VH in the triangular signal and electronegative potential VL be for fixing, and be not subjected to DC power supply 110 magnitude of voltage variation and change; Described comparison means 130 is to can be a comparator 131, and the signal that is transmitted in order to received signal generation device 140 and divider resistance device 120 compares, and export a pulse-width modulation signal (Pulse width modulation signal), when variable DC voltage source Vin provides voltage source (as: 2～5 volts) to divider resistance device 120, make divider resistance device 120 calculate the voltage signal that is sent to comparison means 130 by dividing potential drop theorem formula, simultaneously, after the triangular signal of signal generation device 140 also is sent to comparison means 130, make 130 pairs of voltage signals of comparison means and triangular signal compare and the output pulse width modulating signal move with fan motor device (not shown); By seeing among Fig. 2 that the voltage speed curves T1 in the existing voltage speed curves figure is a curve that breakover point P irregularity is arranged.
See also shown in Fig. 3 A, Fig. 3 B, Fig. 3 C, be the existing application circuit diagram, this moment, the high potential VH and the electronegative potential VL of known triangular wave generator 141 were made as 2 volts and 1 volt, the first resistor assembly R7 is made as 10K nurse difficult to understand, if the work period of PWM is 50%, when variable DC voltage source Vin was 2 volts, then first node voltage Vr calculated according to following formula:
Via the aforementioned calculation node voltage Vr that can win is 1.5 volts, and the second resistor assembly R8 nurse difficult to understand that is 30K, if the work period of PWM is 100%, and when variable DC voltage source Vin is 5 volts, first segment then
Point voltage Vr calculates according to following formula:
Thereby be that 5 volts first node voltage Vr is 3.75 volts at variable DC voltage source Vin as can be known, if, just can touch high potential VH when first node voltage Vr is 2 volts, and the variable DC voltage source Vin of this moment calculates according to following formula:
According to the data of the aforementioned calculation figure that can run a curve, among the figure at work period 50% and variable DC voltage
Source Vin be 2 volts of corresponding points just for the cycle-starting point that voltage curve D1 rises, and the cycle-voltage curve D1 continue to rise and to touch when variable DC voltage source Vin is 2.67 volts, then the cycle-the variable DC voltage source Vin that moves to that voltage curve D1 maintains an equal level is 5 volts of positions, cycle-voltage curve is the curve that presents non-level and smooth (suitable) so as can be known.
In sum, the prior PWM circuit has the following points shortcoming:
1.PWM the cycle-voltage curve of circuit is the curve of non-level and smooth (suitable), makes pwm circuit stable inadequately.
2.PWM the voltage speed curves figure of circuit is non-level and smooth (suitable) curve, makes the pwm circuit instability.
Be with, how to solve above-mentioned existing problem and defective, the utility model designer who is this case desires most ardently the direction place that research improves with the relevant manufacturer that is engaged in the industry.
The utility model designer is because above-mentioned defective, collect related data, via assessment and consideration in many ways, and to be engaged in the many years of experience in the industry accumulation, via constantly studying and revising, the beginning is designed the novel patent that this kind has the pulse width modulation framework of adjusting the work period.
Summary of the invention
Main purpose of the present utility model is to provide a kind of pulse width modulation framework of adjusting the work period that has, in order to overcome above-mentioned defective.
Be above-mentioned purpose, the utility model is a kind of pulse width modulation framework of adjusting the work period that has, and described pulse width modulation framework comprises that a direct current power-supply unit is in order to voltage source to be provided and to produce a voltage signal; One signal generation unit is in order to produce waveform signal; One divider resistance unit is the voltage quasi position that can set described signal generation unit; One reference voltage unit is can be by external circuit and internal circuit setting voltage value, and is not subjected to described direct current power supply unit to change the supply magnitude of voltage and changes; With a comparing unit, be that the signal that receives described signal generation unit and described reference voltage unit compares and export a comparison signal, when the voltage signal of described direct current power supply unit sends described divider resistance unit to, after described divider resistance unit will receive described voltage signal and the accurate position of setting voltage, be resent to described signal generation unit, the waveform signal that described signal generation unit is produced is adjusted voltage quasi position according to described voltage signal, and described comparing unit compares according to the signal that receives described signal generation unit and described reference voltage unit, and export comparison signal and order about fan motor action, so that the cycle-voltage of described pulse width modulation reaches the state than linear smoothing (suitable).
The beneficial effects of the utility model are compared with the prior art, make the output signal of described pulse width modulation have the effect that is than linear smoothing (suitable).
Description of drawings
Fig. 1 is the circuit box schematic diagram of existing pulse width modulation circuit;
Fig. 2 is the voltage speed curves figure of existing pulse width modulation circuit;
Fig. 3 A is the application circuit of existing pulse width modulation circuit;
Fig. 3 B is the application wiggle trace figure of existing pulse width modulation circuit;
Fig. 3 C is the cycle-voltage curve of existing pulse width modulation circuit;
Fig. 4 is a circuit box schematic diagram of the present utility model;
Fig. 5 is voltage speed curves figure of the present utility model;
Fig. 6 A is an application circuit of the present utility model;
Fig. 6 B is an applied waveforms curve chart of the present utility model; With
Fig. 6 C is cycle-voltage curve of the present utility model.
Description of reference numerals: 310-direct current power supply unit; R3-the 3rd resistor assembly; 320-divider resistance unit; R4-the 4th resistor assembly; The 330-comparing unit; VH-first node voltage; The 331-comparator; VL-Section Point voltage; 340-signal generation unit; Vbase-the 3rd node voltage; 341-triangular wave generator; R5-the 5th resistor assembly; The 350-reference voltage unit; R6-the 6th resistor assembly; The 351-voltage adjuster; The G-earth terminal; The Vin-variable voltage source; T2-voltage speed curves; R1-first resistor assembly; D2-cycle-voltage curve; R2-second resistor assembly.
Embodiment
Below in conjunction with accompanying drawing, to this novel above-mentionedly is described in more detail with other technical characterictic and advantage.
The utility model is a kind of pulse width modulation framework of adjusting the work period that has, it is to be applied on the fan motor (not shown), see also the 4th, shown in 5, in a preferred embodiment of the present utility model, described pulse width modulation (Pulse width modulation, hereinafter to be referred as PWM) framework is to comprise a direct current power-supply unit 310, one divider resistance unit 320, one comparing unit 330, an one signal generation unit 340 and a reference voltage unit 350, wherein said direct current power supply unit 310 is in order to voltage source to be provided and to produce a voltage signal, and described divider resistance unit 320 is the voltage quasi positions that can set described signal generation unit 340, and described signal generation unit 340 is in order to produce a triangular signal or sawed-off ripple signal, and described reference voltage unit 350 is by external circuit or internal circuit setting voltage value, and be not subjected to described direct current power supply unit 310 to change supply-voltage sources and change, described comparing unit 330 is in order to receive the signal of described signal generation unit 340 and described reference voltage unit 350, compare and export a comparison signal, wherein said comparison signal is to can be a pulse-width modulation signal (Pulse widthmodulation signal), when the voltage signal of described direct current power supply unit 310 is sent to described divider resistance unit 320, after making described divider resistance unit 320 receive voltage signal and the accurate position of setting voltage, be resent to described signal generation unit 340, make the triangular signal or the sawed-off ripple signal of described signal generation unit 340 adjust voltage quasi position according to voltage signal, after 330 signals according to described signal generation unit 340 of reception and described reference voltage unit 350 of described comparing unit compare, and the output pulse width modulating signal orders about fan motor action, has the effect that is than linear smoothing (suitable) with the signal that reaches output; By the problem that can see the smooth-going no breakover point P that the also obvious more existing voltage speed curves T1 of voltage speed curves T2 of the present utility model comes among Fig. 5, meaning is that voltage speed curves T2 is the curve that is than a linear smoothing (suitable), makes the voltage speed curves of described pulse width modulation reach state than linear smoothing (suitable).
See also shown in Fig. 6 A, application circuit for preferred embodiment of the present utility model, described direct current power supply unit 310 is a variable voltage source Vin, and be respectively equipped with one first resistor assembly R1 in the described divider resistance unit 320, one second resistor assembly R2, one the 3rd resistor assembly R3 and one the 4th resistor assembly R4, the end of the wherein said first resistor assembly R1 and described variable voltage source Vin, the end of described the 3rd resistor assembly R3 couples mutually, it is held in addition and then couples mutually with the end of the described second resistor assembly R2, and the other end of the described second resistor assembly R2 and an earth terminal G join, and the end of described the 4th resistor assembly R4 couples mutually with the other end of described the 3rd resistor assembly R3, and it is held with described earth terminal G in addition and joins; The wherein said first resistor assembly R1 with have a first node voltage VH between the described second resistor assembly R2 couples mutually, described the 3rd resistor assembly R3 with have a Section Point voltage VL between described the 4th resistor assembly R4 couples mutually.
Described signal generation unit 340 is a triangular wave generator 341, described triangular wave generator 341 couples mutually with described first node voltage VH, described Section Point voltage VL respectively, and wherein said first node voltage VH and described Section Point voltage VL are high potential and the electronegative potentials that can set described triangular wave generator 341; Described reference voltage unit 350 is respectively equipped with a voltage adjuster 351 (VOLTAGE REGULATOR), one the 5th resistor assembly R5 and one the 6th resistor assembly R6, wherein said voltage adjuster 351 couples mutually with the end of described variable voltage source Vin, described the 5th resistor assembly R5, and the end of described the 6th resistor assembly R6 couples mutually with the end in addition of described the 5th resistor assembly R5, its in addition end join with earth terminal G, and described the 5th resistor assembly R5 with have one the 3rd node voltage Vbase between described the 6th resistor assembly R6 couples mutually; Described comparing unit 330 is a comparator 331, and described comparator 331 couples mutually with described triangular wave generator 341, described the 3rd node voltage Vbase.
In addition, the first resistor assembly R1, the second resistor assembly R2, the 3rd resistor assembly R3, the 4th resistor assembly R4, the 5th resistor assembly R5 and the 6th resistor assembly R6 in above-mentioned can be wire-wound resistor, metalfilmresistor, alloy film resistance, oxidized metal mould resistor, fixed carbon resister, solid carbonaceous resistance, cement resistor etc. one of them.
By above-mentioned structure, composition design, be described as follows with regard to use start situation of the present utility model now:
See also shown in Fig. 6 A, Fig. 6 B, Fig. 6 C, this moment, known described the 3rd node voltage Vbase was made as 0.5 volt, described first resistor assembly R1 and described the 3rd resistor assembly R3 are made as 10K respectively and beat up nurse, if the work period is 100%, when variable voltage source Vin is 5 volts, described Section Point voltage VL need equal 0.5 volt, and then the 4th resistor assembly R4 can calculate by dividing potential drop theorem formula:
After aforementioned calculation, can get the 4th resistor assembly R4 is 1.02K nurse difficult to understand; If the work period 50%, when variable voltage source Vin was 2 volts, then Ci Shi first node voltage VH and Section Point voltage VL, the second resistor assembly R2 can calculate by dividing potential drop theorem formula and work period formula and learn:
Via the aforementioned calculation result as can be known first node voltage VH be 0.815 volt, and described Section Point voltage VL is 0.185 volt, the second resistor assembly R2 is 6.88K ohm, at this moment, in the work period 100%, first node voltage VH when variable voltage source Vin is 5 volts does not learn, therefore must calculate by dividing potential drop theorem formula:
Thereby learn that variable voltage source Vin is that 5 volts first node voltage VH is 2.04 volts; According to the above-mentioned data of the calculating figure that to run a curve, among the figure in the work period 50% with variable voltage source Vin be 2 volts of corresponding points be the cycle-starting point that voltage curve D2 rises, it is 5 volts position that described cycle this moment-voltage curve D2 continues to rise to variable voltage source Vin, as can be known this cycle-voltage curve D2 obtains a smooth-going curve, so more existing cycle-voltage curve D1 does not have breakover point, therefore, make the output signal of described pulse width modulation have the effect that is than linear smoothing (suitable).
More than explanation is novel just illustrative for this; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.
Claims (8)
1. one kind has the pulse width modulation framework of adjusting the work period, and it is characterized in that: it comprises:
One direct current power-supply unit is in order to provide voltage source and to produce a voltage signal;
One divider resistance unit, itself and described direct current power supply unit transmit voltage signal in order to receive described direct current power supply unit, set the voltage quasi position of described signal generation unit;
One signal generation unit, it is connected with described divider resistance unit, in order to produce waveform signal;
One reference voltage unit, it is by external circuit and internal circuit setting voltage value;
One comparing unit, it is connected with described reference voltage unit with described signal generation unit respectively, compares and export a comparison signal in order to the signal that receives described signal generation unit and described reference voltage unit.
2. the pulse width modulation framework with adjustment work period according to claim 1, it is characterized in that: described direct current power supply unit is a variable voltage source.
3. the pulse width modulation framework with adjustment work period according to claim 1 is characterized in that: be provided with one first resistor assembly, one second resistor assembly, one the 3rd resistor assembly and one the 4th resistor assembly in the described divider resistance unit.
4. the pulse width modulation framework with adjustment work period according to claim 1, it is characterized in that: described signal generation unit is a triangular wave generator.
5. the pulse width modulation framework with adjustment work period according to claim 1, it is characterized in that: described comparing unit is a comparator.
6. the pulse width modulation framework with adjustment work period according to claim 1, it is characterized in that: described reference voltage unit is respectively equipped with a voltage adjuster, one the 5th resistor assembly and one the 6th resistor assembly.
7. according to claim 3 have a pulse width modulation framework of adjusting the work period, it is characterized in that: described first resistor assembly, second resistor assembly, the 3rd resistor assembly and the 4th resistor assembly be wire-wound resistor, metalfilmresistor, alloy film resistance, oxidized metal mould resistor, fixed carbon resister, solid carbonaceous resistance or cement resistor one of them.
8. according to claim 6 have a pulse width modulation framework of adjusting the work period, it is characterized in that: described the 5th resistor assembly and the 6th resistor assembly be wire-wound resistor, metalfilmresistor, alloy film resistance, oxidized metal mould resistor, fixed carbon resister, solid carbonaceous resistance or cement resistor one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200041073U CN201197114Y (en) | 2008-01-31 | 2008-01-31 | Pulse width modulation structure with regulation work period |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200041073U CN201197114Y (en) | 2008-01-31 | 2008-01-31 | Pulse width modulation structure with regulation work period |
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| CN201197114Y true CN201197114Y (en) | 2009-02-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455716A (en) * | 2010-10-20 | 2012-05-16 | 技鼎股份有限公司 | Rapid cooling device and temperature control method thereof |
| CN105465022A (en) * | 2015-11-16 | 2016-04-06 | 上海斐讯数据通信技术有限公司 | Circuit for changing rotation speed along with power |
| CN106357169A (en) * | 2016-10-20 | 2017-01-25 | 珠海格力节能环保制冷技术研究中心有限公司 | PWM modulation circuit and direct-current brushless motor controller |
| CN104426441B (en) * | 2013-09-02 | 2017-04-26 | 茂达电子股份有限公司 | Fan system, single-phase direct current motor control circuit and control method thereof |
-
2008
- 2008-01-31 CN CNU2008200041073U patent/CN201197114Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455716A (en) * | 2010-10-20 | 2012-05-16 | 技鼎股份有限公司 | Rapid cooling device and temperature control method thereof |
| CN102455716B (en) * | 2010-10-20 | 2013-12-18 | 技鼎股份有限公司 | Rapid cooling device and temperature control method thereof |
| CN104426441B (en) * | 2013-09-02 | 2017-04-26 | 茂达电子股份有限公司 | Fan system, single-phase direct current motor control circuit and control method thereof |
| CN105465022A (en) * | 2015-11-16 | 2016-04-06 | 上海斐讯数据通信技术有限公司 | Circuit for changing rotation speed along with power |
| CN106357169A (en) * | 2016-10-20 | 2017-01-25 | 珠海格力节能环保制冷技术研究中心有限公司 | PWM modulation circuit and direct-current brushless motor controller |
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Granted publication date: 20090218 |
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