CN103546128A - Method for controlling PWM in discretization mode - Google Patents
Method for controlling PWM in discretization mode Download PDFInfo
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- CN103546128A CN103546128A CN201310536397.1A CN201310536397A CN103546128A CN 103546128 A CN103546128 A CN 103546128A CN 201310536397 A CN201310536397 A CN 201310536397A CN 103546128 A CN103546128 A CN 103546128A
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Abstract
The invention discloses a method for controlling PWM in a discretization mode, and belongs to the field of mechanical control. The method is applied to temperature control over a heating element, the heating element is connected with a power source through a solid-state relay, and the solid-state relay is connected with a programmable PWM unit. The control method includes the steps that the programmable PWM unit modulates an output signal, and high electric level in a PWM period is scattered to the whole period in the discretization mode by the output signal; the modulated output signal is output to the solid-state relay by the programmable PWM unit; the solid-state relay controls the heating element to be connected or disconnected with the power source through the output signal. According to the technical scheme of the method, the discretization PWM technology is adopted, the PWM output signal the optimized, and therefore heating is uniform, the temperature of the heating element is uniform, the phenomenon that the heating element is suddenly cold and suddenly hot is avoided, and an ideal control effect is achieved.
Description
Technical field
The invention belongs to mechanical control field, relate to a kind of control method, relate in particular to a kind of PWM control method that is applicable to the discretization of temperature of heating elements control.
Background technology
While utilizing solid-state relay to heat high-power resistive heater element, run into such problem: how to control heater element, just can make temperature of heating elements comparatively even; Only having the temperature of heater element to present uniformity, is not sometimes hot and sometimes cold, controls effect just likely comparatively desirable.
Generally do like this: for 50 hz AC electricity, the ON time of a solid-state relay is 20 milliseconds.If resolution is 1%, the PWM cycle is 100 * 20 milliseconds=2 seconds.Take duty ratio 25% as example, 2 seconds * 25%=0.5 of ON time second, turn-off time: 2-0.5=1.5 second.
The problem of doing like this: take and state duty ratio 25%, the uniformity of heating is bad; If duty ratio is 10%, the uniformity of heating can be more bad.Therefore, consider merely duty ratio and PWM cycle, the innovation of not doing on algorithm is to can't resolve the problem of above-mentioned existence.
Summary of the invention
In view of this, the present invention adopts discretization PWM technology, be about to the high level of a PWM in the cycle, with discrete form, assign to the whole cycle, optimized PWM output signal, made the mode of heating comparatively even, temperature of heating elements presents uniformity, avoid sometimes hot and sometimes cold phenomenon, reached comparatively desirable control effect.
For achieving the above object, concrete technical scheme is as follows:
A kind of PWM control method of discretization is provided, the temperature that is applied to heater element is controlled, described heater element is connected with power supply by solid-state relay, and described solid-state relay is connected with Programmable pulse width PWM unit, and described control method comprises the following steps:
Step 1, described Programmable pulse width PWM cells modulate output signal, described output signal is the high level in the cycle by a PWM, with discrete form, assigns to the whole cycle;
Step 2, described Programmable pulse width PWM unit exports the output signal after modulation to solid-state relay;
Step 3, described solid-state relay is controlled being communicated with or shutoff of described heater element and power supply according to described output signal.
Preferably, output signal described in described step 1 is cumulative duty ratio in each power frequency period, if result has carry, exports high level, otherwise output low level.
Preferably, described solid-state relay comprises input circuit, isolation and output circuit.
Preferably, in described step 2, Programmable pulse width PWM unit is added to the output signal of variable duty ratio the input circuit of described solid-state relay.
Preferably, in described step 3, the output loop of solid-state relay connects heater element and realizes itself and being communicated with or shutoff of power supply.
With respect to prior art, technical scheme of the present invention adopts discretization PWM technology, be about to the high level of a PWM in the cycle, with discrete form, assign to the whole cycle, optimized PWM output signal, made the mode of heating comparatively even, temperature of heating elements presents uniformity, avoid sometimes hot and sometimes cold phenomenon, reached comparatively desirable control effect.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The oscillogram of the output signal of common PWM modulation when Fig. 1 is duty ratio 25%;
The oscillogram of the output signal of Programmable pulse width PWM cells modulate in embodiments of the invention when Fig. 2 is duty ratio 25%.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the present invention can combine mutually.
Below with reference to accompanying drawing, embodiments of the invention are done to concrete explaination.
The PWM control method of a kind of discretization of embodiments of the invention as shown in Figure 1, the temperature that is applied to heater element is controlled, described heater element is connected with power supply by solid-state relay, described solid-state relay is connected with Programmable pulse width PWM unit, and described control method comprises the following steps:
Step 1, described Programmable pulse width PWM cells modulate output signal, described output signal is the high level in the cycle by a PWM, with discrete form, assigns to the whole cycle;
Step 2, described Programmable pulse width PWM unit exports the output signal after modulation to solid-state relay;
Step 3, described solid-state relay is controlled being communicated with or shutoff of described heater element and power supply according to described output signal.
Embodiments of the invention have adopted discretization PWM technology, be about to the high level of a PWM in the cycle, with discrete form, assign to the whole cycle, optimized PWM output signal, make the mode of heating comparatively even, temperature of heating elements presents uniformity, has avoided producing sometimes hot and sometimes cold phenomenon, has reached comparatively desirable control effect.
In an embodiment of the present invention, make O=∑ △, the output of O=digital PWM, △=duty ratio, if ∑ △ is >=1, O=1; Otherwise O=0.
During actual program, for saving program runtime, should take integer arithmetic, rather than floating-point.Once bright for instance: if PWM resolution is 8, be designated as △=D7-D0, duty ratio corresponding △=(D7-D0)/256, make sum=d8-d0=∑ (D7-D0), and d8 position is carry, if d8 is 1, export highly, otherwise export low.
As shown in figs. 1 and 2, in an embodiment of the present invention, Fig. 1 is the waveform of the output signal of common PWM modulation; Fig. 2 is the waveform of the output signal of Programmable pulse width PWM cells modulate in embodiments of the invention, and the mode of the heating of the output signal of the Programmable pulse width PWM cells modulate of embodiments of the invention is comparatively even as can be seen from Figure.
Above specific embodiments of the invention be have been described in detail, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and alternative also all among category of the present invention.Therefore, equalization conversion and the modification done without departing from the spirit and scope of the invention, all should contain within the scope of the invention.
Claims (5)
1. the PWM control method of a discretization, the temperature that is applied to heater element is controlled, and described heater element is connected with power supply by solid-state relay, and described solid-state relay is connected with Programmable pulse width PWM unit, it is characterized in that, described control method comprises the following steps:
Step 1, described Programmable pulse width PWM cells modulate output signal, described output signal is the high level in the cycle by a PWM, with discrete form, assigns to the whole cycle;
Step 2, described Programmable pulse width PWM unit exports the output signal after modulation to solid-state relay;
Step 3, described solid-state relay is controlled being communicated with or shutoff of described heater element and power supply according to described output signal.
2. the PWM control method of discretization as claimed in claim 1, is characterized in that, output signal described in described step 1 is cumulative duty ratio in each power frequency period, if result has carry, exports high level, otherwise output low level.
3. the PWM control method of discretization as claimed in claim 2, is characterized in that, described solid-state relay comprises input circuit, isolation and output circuit.
4. the PWM control method of discretization as claimed in claim 3, is characterized in that, in described step 2, Programmable pulse width PWM unit is added to the output signal of variable duty ratio the input circuit of described solid-state relay.
5. the PWM control method of discretization as claimed in claim 4, is characterized in that, in described step 3, the output loop of solid-state relay connects heater element and realizes itself and being communicated with or shutoff of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310536397.1A CN103546128A (en) | 2013-11-01 | 2013-11-01 | Method for controlling PWM in discretization mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310536397.1A CN103546128A (en) | 2013-11-01 | 2013-11-01 | Method for controlling PWM in discretization mode |
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| CN103546128A true CN103546128A (en) | 2014-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114995552A (en) * | 2022-06-08 | 2022-09-02 | 长光卫星技术股份有限公司 | Precise temperature control system and method for microsatellite reflector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709010A (en) * | 2002-12-02 | 2005-12-14 | 株式会社东芝 | Induction heating cooking appliance |
| US20080036552A1 (en) * | 2004-08-19 | 2008-02-14 | Conti Temic Microelectronic Gmbh | Method and Circuit Arrangement for the Production of an Output Signal of a Predefined Average Size From a Relatively Larger Input Signal by Pulse-Width Modulated Connection of Said Input Signal |
| CN101901578A (en) * | 2010-08-19 | 2010-12-01 | 深圳市明微电子股份有限公司 | Display control method and device |
| CN103036540A (en) * | 2011-09-30 | 2013-04-10 | 北大方正集团有限公司 | Pulse width modulation (PWM) method and device for power control |
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2013
- 2013-11-01 CN CN201310536397.1A patent/CN103546128A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1709010A (en) * | 2002-12-02 | 2005-12-14 | 株式会社东芝 | Induction heating cooking appliance |
| US20080036552A1 (en) * | 2004-08-19 | 2008-02-14 | Conti Temic Microelectronic Gmbh | Method and Circuit Arrangement for the Production of an Output Signal of a Predefined Average Size From a Relatively Larger Input Signal by Pulse-Width Modulated Connection of Said Input Signal |
| CN101901578A (en) * | 2010-08-19 | 2010-12-01 | 深圳市明微电子股份有限公司 | Display control method and device |
| CN103036540A (en) * | 2011-09-30 | 2013-04-10 | 北大方正集团有限公司 | Pulse width modulation (PWM) method and device for power control |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114995552A (en) * | 2022-06-08 | 2022-09-02 | 长光卫星技术股份有限公司 | Precise temperature control system and method for microsatellite reflector |
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Application publication date: 20140129 |