CN202918259U - Pulse width modulation signal generation apparatus and medical equipment - Google Patents
Pulse width modulation signal generation apparatus and medical equipment Download PDFInfo
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- CN202918259U CN202918259U CN 201220558230 CN201220558230U CN202918259U CN 202918259 U CN202918259 U CN 202918259U CN 201220558230 CN201220558230 CN 201220558230 CN 201220558230 U CN201220558230 U CN 201220558230U CN 202918259 U CN202918259 U CN 202918259U
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Abstract
Disclosed in the application is a pulse width modulation signal generation apparatus that comprises a plurality of timers for generating different duty ratio signals and a multi-path output selector for receiving the different duty ratio signals from the plurality of timers and outputting a pulse width modulation signal according to a selection signal. In addition, medical equipment including the pulse width modulation signal generation apparatus is also disclosed by the application. According to the pulse width modulation signal generation apparatus, the existing common components can be utilized and a need pulse width modulation signal can be generated conveniently, thereby reducing the cost and the design complexity.
Description
Technical field
The utility model relates to the field of pulse width modulation, and more specifically, relates to the pulse width modulating signal generating apparatus, also relates to the Medical Devices that comprise this pulse width modulating signal generating apparatus.
Background technology
Pulse width modulation (PWM) is called for short pulse-width modulation, is to utilize the numeral of microprocessor to export a kind of very effective technology that analog circuit is controlled.The PWM control technology is mainly used in the power electronic technology industry, specifically, comprise the fields such as wind power generation, electric machine speed regulation, direct current supply, because the characteristics of its four-quadrant unsteady flow, can feedback regeneration the energy of braking, the energy-saving and emission-reduction that therefore propose for present country have positive effect.
Fig. 1 shows the formation of prior art digital pulse width modulator.In Fig. 1, under the effect of clock signal, 5 outputs of cycle counter increase one by one.5 bit digital modulation signals are controlled with a register, and constantly the output with cycle counter compares, and when modulation signal during greater than the output of cycle counter, comparator is exported high level, otherwise output low level.Behind the cycle counter circulation one-period, send an enable signal EN to register, register is sent into next group data.In each rolling counters forward cycle, owing to varying in size of the modulation signal of inputting, the high level number of comparator output terminal output is different, thereby produces the different pulse width modulation wave of duty ratio.
Fig. 2 schematically shows binary system and the decimal representation of 5 bit digital modulation signals.
For example, in the motion control of X-ray machine, generate pwm signal by using the PWM controller, adjust the speed of service of direct current machine.
But in the situation of the controller that does not have the PWM function, need the chip that one of switching can output pwm signal or design a circuit of realizing the PWM function.
Design realizes that the circuit of PWM function can utilize timer and general purpose input and output (GPIO) port to realize.A GPIO port needs two registers at least, and one is " the general purpose I/O port controling register " of doing control usefulness, and also having one is " the general purpose I/O port data register " of store data.Each of data register is corresponding with the hardware pin of GPIO, and the direction of transfer of data arranges by control register, and the data flow of each pin can be set by control register.This can unnecessarily increase cost and design complexity.
The utility model content
The utility model is intended to provide a kind of pulse width modulating signal generating apparatus, with production burst bandwidth modulation signals in the situation of the controller that does not have the PWM function, thereby reduces cost and design complexity.The utility model also will provide a kind of Medical Devices that comprise above-mentioned pulse width modulating signal generating apparatus.
In view of this, according to an aspect of the present utility model, provide a kind of pulse width modulating signal generating apparatus, having comprised: a plurality of timers are used for generating different duty cycle signals; With a demultiplexer, be used for receiving described different duty cycle signals from described a plurality of timers, and according to the selection signal of inputting, and the output pulse width modulation signal.
Alternatively, described pulse width modulating signal generating apparatus further comprises a plurality of inverters, and an end of each inverter is connected to the output of one of described a plurality of timers, and the other end of this inverter is connected to an input of described demultiplexer.
According to a kind of execution mode, in described a plurality of timer each is connected with the first resistor, the second resistor and the first capacitor, wherein, one end of the first resistor is connected to high level, the other end is connected to the discharge end of timer, and an end of the second resistor is connected to the discharge end of timer, and the other end is connected to the trigger end of timer, one end of the first capacitor is connected to the trigger end of timer, other end ground connection.Like this, by the value of described resistor and capacitor is set, and obtain described different duty cycle signals.
According to a kind of execution mode, the output of this demultiplexer is connected to a motor driver, is used for regulating electric machine speed.
According to a kind of execution mode, this demultiplexer is according to described selection signal, exports duty cycle signals with the corresponding input of described selection signal as pulse width modulating signal.
According on the other hand of the present utility model, a kind of Medical Devices are provided, these Medical Devices comprise a motor driver and above-mentioned any one pulse width modulating signal generating apparatus, the output of wherein said demultiplexer is connected to described motor driver, is used for regulating electric machine speed.
Provide a kind of pulse width modulating signal generation method more on the one hand according to of the present utility model, comprising: duty cycle signals generates step, is used for generating different duty cycle signals by a plurality of timers; Step is selected in output with multichannel, be used for receiving described different duty cycle signals by demultiplexer from described a plurality of timers, and according to the selection signal of inputting, and the output pulse width modulation signal.
By providing according to pulse width modulating signal generating apparatus of the present utility model and method, can utilize existing components and parts commonly used, produce easily the pulse width modulating signal that needs, thereby reduce cost and design complexity.
In addition, can as required, realize different duty by the adjusting resistance capacitance parameter.In the electric machine speed regulation field, can regulate by stable speed, realize soft start and the soft shutoff of motor.
Description of drawings
The below will make clearer above-mentioned and other feature and advantage of the present utility model of those of ordinary skill in the art by describe preferred embodiment of the present utility model in detail with reference to accompanying drawing, in the accompanying drawing:
Fig. 1 illustrates the formation of prior art digital pulse width modulator.
Fig. 2 schematically shows binary system and the decimal representation of 5 bit digital modulation signals.
Fig. 3 illustrates the formation according to the pulse width modulating signal generating apparatus of the utility model one embodiment.
Fig. 4 schematically shows concrete components and parts and the annexation thereof according to the pulse width modulating signal generating apparatus of the utility model one embodiment.
Fig. 5 schematically shows the form according to the corresponding relation of the selection signal of the demultiplexer in the pulse width modulating signal generating apparatus of the utility model one embodiment and output signal.
Fig. 6 schematically shows the waveform according to the output signal of the demultiplexer in the pulse width modulating signal generating apparatus of the utility model one embodiment.
Fig. 7 indicative icon the utility model embodiment in the application of control aspect the motor speed.
Fig. 8 shows the flow chart according to the pulse width modulating signal generation method of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, by the following examples the utility model is further described.Below by these example embodiment are described with reference to the drawings, thereby explain the utility model.
With reference to figure 3, it illustrates the formation according to the pulse width modulating signal generating apparatus of the utility model one embodiment.
This pulse width modulating signal generating apparatus comprises a plurality of timers (for example timer 1, timer 2 ... timer n.) and a demultiplexer.Described a plurality of timer 1-n can produce different duty cycle signals (for example, duty cycle signals 1, duty cycle signals 2 ... duty cycle signals n.), and output to respectively the different inputs of demultiplexer.Demultiplexer receives described different duty cycle signals from described a plurality of timers, and under the control of the selection signal of inputting, the different duty cycle signals that receives is processed, export needed output signal, such as simple step-like output signal, thereby form pwm signal.Here, can calculate and dispose according to actual conditions the peripheral circuit of timer, in order to generate the different duty signal.Timer and demultiplexer can adopt type well known in the art and model.
Below in conjunction with Fig. 4 and Fig. 5 operation principle according to the pulse width modulating signal generating apparatus of the utility model one embodiment is described.
Fig. 4 schematically shows according to the concrete components and parts of the pulse width modulating signal generating apparatus of an embodiment of the utility model and a kind of execution mode of annexation thereof.
Fig. 5 schematically shows the form according to the corresponding relation of the selection signal of the demultiplexer in the pulse width modulating signal generating apparatus of this embodiment of the utility model and output signal.
Fig. 4 illustrates the demonstration formation according to the pulse width modulating signal generating apparatus of the utility model embodiment take two timers as example.But the number of timer is not limited to two.In addition, the number of demultiplexer also is not limited to one.
In Fig. 4, be described as an example of 555 timers example, but the type of timer obviously is not limited to this.
In the peripheral circuit of timer 4 connects, the end of the first resistor R1 is connected to high level Vcc, the other end is connected to the discharge end of timer 4; The end of the second resistor R2 is connected to the discharge end of timer 4, and the other end is connected to the trigger end of timer 4; The end of the first capacitor C1 is connected to the trigger end of timer 4, other end ground connection; And the trigger end of timer 4 linked to each other with the threshold value end.The peripheral circuit of timer 6 connects can be similarly.
By the value of the first and second resistor R1, R2 and the first capacitor C1 is set, so that timer 4 produces 60% duty cycle signals, and outputs to the input I2 of demultiplexer 1, output to simultaneously inverter 5.After inverter 5 receives 60% duty cycle signals, generate 40% duty cycle signals, and output to the input I6 of demultiplexer 1.The use of inverter can be given birth to the output of one road signal by fecund, thereby can reach the purpose of saving element.
Similarly, by the value of the third and fourth resistor R3, R4 and the second capacitor C2 is set, so that timer 6 produces 80% duty cycle signals, and outputs to the input I1 of demultiplexer 1, output to simultaneously inverter 7.After inverter 7 receives 80% duty cycle signals, generate 20% duty cycle signals, and output to the input I7 of demultiplexer 1.
Draw on the input I0 of demultiplexer 1 is direct and be connected to high level Vcc, namely receive 100% duty cycle signals.
The level of selection signal S1-S3 determines the output valve (wouldn't use another output Out1 of demultiplexer here) of the output Out0 of demultiplexer.As shown in Figure 5, be respectively in 0,0,0 the situation value of output Out0 I/O I0 at the level of S3, S2, S1; Be respectively in 0,0,1 the situation value of output Out0 I/O I1 at the level of S3, S2, S1; Be respectively in 0,1,0 the situation value of output Out0 I/O I2 at the level of S3, S2, S1; Be respectively in 0,1,1 the situation value of output Out0 I/O I3 at the level of S3, S2, S 1; Be respectively in 1,0,1 the situation value of output Out0 I/O I4 at the level of S3, S2, S1; Be respectively in 1,0,1 the situation value of output Out0 I/O I5 at the level of S3, S2, S1; Be respectively in 1,1,0 the situation value of output Out0 I/O I6 at the level of S3, S2, S1; Be respectively in 1,1,1 the situation value of output Out0 I/O I7 at the level of S3, S2, S1.
Therefore, enable signal at the Enable Pin EN of demultiplexer 1 is in the effective situation, to be input to from the selection signal of a controller S1, S2, the S3 end of demultiplexer 1, the exportable signal corresponding with respective input of the output Out0 of demultiplexer 1.
Specifically, take Fig. 6 as example, be respectively 1,1 at the level of S3, S2, S1,1-1,1,0-0,1,0-0,0,1-in 0,0,0 the situation, the output signal of output Out0 is 0-20%-40%-60%-80%-100%.Otherwise, be random time after 100% in the output signal of output Out0, level by S3, S2, S1 is set to 0,0,0-0,0,1-0,1,0-1,1,0-1,1,1, the output signal of output Out0 is 100%-〉80%-60%-40-20%-0.By above operation, can form required pulse width modulating signal.
Should be noted that the duty ratio here only is example, can be depending on actual application environment other different duty ratios are set.
Fig. 7 indicative icon the another embodiment of the utility model in the application of control aspect the motor speed.Wherein, the output of demultiplexer 1 is connected to the input of a motor driver 2, is used for the speed of regulating electric machine 3; Output OUT1 and the OUT2 of motor driver are connected to motor 3.
Particularly, motor driver 2 receives the signal that demultiplexer 1 is exported, and is in the effective situation at enable signal, controls the rotating speed of motor by different demultiplexer output signals.Different duty cycle signals can be corresponding to different motor speeds.For example, be 0-in the output signal of demultiplexer〉20%-〉40%-〉60%-〉80%-〉in 100% the situation, motor speed can be realized 0-〉20%-〉40%-〉60%-〉80%-〉100% transformation, thus realize the soft start of motor; Output signal at demultiplexer is 100%-〉80%-〉60%-〉40-〉20%-〉in 0 the situation, motor speed can be realized 100%-〉80%-〉60%-〉40-〉20%-〉0 transformation, thus realize the soft shutoff of motor.
Fig. 8 shows according to the utility model flow chart of the pulse width modulating signal generation method of an embodiment again.
Pulse width modulating signal generation method comprises that duty cycle signals generates steps A 1 and steps A 2 is selected in multichannel output.Generate in the steps A 1 at duty cycle signals, a plurality of timers generate different duty cycle signals.Select in the steps A 2 in multichannel output, demultiplexer receives described different duty cycle signals from described a plurality of timers, and according to the selection signal of inputting, exports needed output signal, thereby forms pwm signal.
After generating steps A 1, duty cycle signals may further include anti-phase steps A 3, and anti-phase for the output of one of described a plurality of timers is carried out, and anti-phase result is outputed to the input of described demultiplexer.
Generate in the steps A 1 in described duty ratio, by each contact resistance device and the capacitor in described a plurality of timers, and the value of described resistor and capacitor is set, and obtains described different duty cycle signals.
Select further to comprise motor speed regulating step A4 after the steps A 2 in this multichannel output, be used for being connected to motor driver by the output with this demultiplexer, thus regulating electric machine speed.
Select in the steps A 2 in this multichannel output, this demultiplexer is exported the duty cycle signals corresponding with respective input according to this selection signal.
According to another aspect of the present utility model, a kind of Medical Devices also are provided, these Medical Devices comprise a motor driver and pulse width modulating signal generating apparatus as mentioned above, and the output of wherein said demultiplexer is connected to described motor driver.Motor driver comes regulating electric machine speed according to the output signal of demultiplexer.
Described Medical Devices can be Computed tomography (CT) equipment, magnetic resonance imaging (MRI) equipment, X-ray machine or supersonic imaging apparatus.
The application discloses a kind of pulse width modulating signal generating apparatus, comprising: a plurality of timers are used for generating different duty cycle signals; With a demultiplexer, be used for receiving described different duty cycle signals from described a plurality of timers, and according to the selection signal, and the output pulse width modulation signal.Disclosed herein as well is a kind of Medical Devices that comprise this pulse width modulating signal generating apparatus.By the application's pulse width modulating signal generating apparatus, can utilize existing components and parts commonly used, produce easily the pulse width modulating signal that needs, thereby reduce cost and design complexity.
More than pulse width modulating signal generating apparatus provided by the utility model and method are described in detail.Although illustrated and described example embodiment more of the present utility model; but the above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle; any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. a pulse width modulating signal generating apparatus is characterized in that, comprising:
A plurality of timers are used for generating different duty cycle signals; With
A demultiplexer is used for receiving described different duty cycle signals from described a plurality of timers, and according to selecting signal output pulse width modulation signal.
2. according to claim 1 pulse width modulating signal generating apparatus is characterized in that, further comprises:
A plurality of inverters, an end of each inverter is connected to the output of one of described a plurality of timers, and the other end of this inverter is connected to an input of described demultiplexer.
3. according to claim 2 pulse width modulating signal generating apparatus is characterized in that,
In described a plurality of timer each is connected with the first resistor, the second resistor and the first capacitor, wherein, one end of the first resistor is connected to high level, the other end is connected to the discharge end of this timer, one end of the second resistor is connected to the discharge end of this timer, the other end is connected to the trigger end of this timer, and an end of the first capacitor is connected to the trigger end of timer, other end ground connection.
4. according to claim 1 pulse width modulating signal generating apparatus is characterized in that,
The output of this demultiplexer is connected to a motor driver, to be used for regulating electric machine speed.
5. according to claim 1 pulse width modulating signal generating apparatus is characterized in that,
The duty cycle signals of this demultiplexer output and the corresponding input of described selection signal is as pulse width modulating signal.
6. Medical Devices, it is characterized in that, these Medical Devices comprise a motor driver and just like each described pulse width modulating signal generating apparatus in the claim 1 to 5, the output of wherein said demultiplexer is connected to described motor driver.
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| CN 201220558230 CN202918259U (en) | 2012-10-29 | 2012-10-29 | Pulse width modulation signal generation apparatus and medical equipment |
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| CN 201220558230 CN202918259U (en) | 2012-10-29 | 2012-10-29 | Pulse width modulation signal generation apparatus and medical equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297783A (en) * | 2013-06-20 | 2013-09-11 | 重庆大学 | Ultrasound Chirp code signal implementation method based on dynamic pulse width modulation |
| CN105846798A (en) * | 2016-05-27 | 2016-08-10 | 上海路虹电子科技有限公司 | Soft switching module |
| CN113380299A (en) * | 2021-06-28 | 2021-09-10 | 长江存储科技有限责任公司 | Memory system, memory device, predriver and control method of predriver |
-
2012
- 2012-10-29 CN CN 201220558230 patent/CN202918259U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103297783A (en) * | 2013-06-20 | 2013-09-11 | 重庆大学 | Ultrasound Chirp code signal implementation method based on dynamic pulse width modulation |
| CN103297783B (en) * | 2013-06-20 | 2016-03-09 | 重庆大学 | A kind of ultrasound Chirp code signal implementation method based on dynamic pulse width modulation |
| CN105846798A (en) * | 2016-05-27 | 2016-08-10 | 上海路虹电子科技有限公司 | Soft switching module |
| CN113380299A (en) * | 2021-06-28 | 2021-09-10 | 长江存储科技有限责任公司 | Memory system, memory device, predriver and control method of predriver |
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