CN203770183U - PWM (Pulse-Width Modulation) speed control device for heat-dissipation direct current fan of short-wave transmitter - Google Patents
PWM (Pulse-Width Modulation) speed control device for heat-dissipation direct current fan of short-wave transmitter Download PDFInfo
- Publication number
- CN203770183U CN203770183U CN201420116977.5U CN201420116977U CN203770183U CN 203770183 U CN203770183 U CN 203770183U CN 201420116977 U CN201420116977 U CN 201420116977U CN 203770183 U CN203770183 U CN 203770183U
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- wave transmitter
- resistance
- fan
- short wave
- circuit
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- 230000017525 heat dissipation Effects 0.000 title abstract 3
- 239000004065 semiconductor Substances 0.000 claims abstract description 20
- 230000005855 radiation Effects 0.000 claims description 24
- 238000002955 isolation Methods 0.000 abstract 6
- 230000005693 optoelectronics Effects 0.000 abstract 6
- 230000005540 biological transmission Effects 0.000 abstract 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Abstract
The utility model provides a PWM (Pulse-Width Modulation) speed control device for a heat-dissipation direct current fan of a short-wave transmitter. The PWM speed control device comprises a temperature sensing circuit, a single chip computer, an optoelectronic isolation circuit and a driving circuit, wherein the temperature sensing circuit is mounted on the power amplifier of the short-wave transmitter, the output end signal of the temperature sensing circuit is connected with the input end of the single chip computer, the output end signal of the single chip computer is connected with the cathode of the optoelectronic isolation circuit, the anode of the optoelectronic isolation circuit is connected with the working power supply of the optoelectronic isolation circuit through a set third resistance signal, the collector signal of the optoelectronic isolation circuit is connected with the grid of an MOS (Metal Oxide Semiconductor) tube, and the emitter of the optoelectronic isolation circuit is connected with the power supply cathode of the heat-dissipation direct current fan of the short-wave transmitter. According to the circuit, when the short-wave transmitter is not in transmission or environment temperature is low, the noise is reduced, the work environment is purified, power consumption of the fan is reduced, and efficiency of the transmitter is improved.
Description
Technical field
The utility model belongs to design of electronic circuits, is specifically related to a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation.
Background technique
In short wave transmitter, power amplifier (abbreviation power amplifier) is maximum power consumption unit, and its amplification efficiency is less than 30%, and the remaining electric energy over 70% has become heat energy, and huge heat can cause power amplifier temperature to raise rapidly.For power amplifier is normally worked, with the cooling power amplifier of blower fan, be current unique method.The blower fan that cooling power amplifier is used adopts short wave transmitter heat radiation DC fan mostly, and this fan pressure is large, but noise is also large.
Model utility content
The purpose of this utility model is: a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation are provided, reduce noise when short wave transmitter is not launched or when ambient temperature is lower, purify working environment; Reduce the power consumption of blower fan, improve the efficiency of commutator.
Technological scheme of the present invention is: a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation, comprise temperature sensing circuit, single-chip microcomputer, photoelectric isolating circuit and drive circuit; Described drive circuit comprises the first resistance, the second resistance and metal-oxide-semiconductor, grid one tunnel of described metal-oxide-semiconductor is connected in series the first resistance and by the first resistance, is connected to the high-voltage power of short wave transmitter heat radiation DC fan, the grid Yi in parallel road of metal-oxide-semiconductor is connected in series the second resistance and by the second resistance, connects the power cathode of described DC fan, and the source electrode of described metal-oxide-semiconductor connects the power cathode of described DC fan;
Described temperature sensing circuit is installed on the power amplifier of short wave transmitter, and temperature sensing circuit output end signal is connected to the input end of single-chip microcomputer; Described single-chip microcomputer output end signal is connected to photoelectric isolating circuit negative electrode, and the anode of photoelectric isolating circuit is connected to the working power of photoelectric isolating circuit by the 3rd resistance signal being provided with; The collector signal of described photoelectric isolating circuit is connected to the grid of metal-oxide-semiconductor, the emitter of photoelectric isolating circuit connects the power cathode of short wave transmitter heat radiation DC fan;
Drain electrode one tunnel of described metal-oxide-semiconductor is connected to the positive pole of rectification diode, Yi in parallel road is connected to two the first stationary contacts of putting switch of hilted broadsword, the negative pole of described rectification diode is connected to the high-voltage power of short wave transmitter heat radiation DC fan, and two the second stationary contacts of putting switch of described hilted broadsword locate with moving the power cathode that contact is all connected short wave transmitter heat radiation DC fan.
Further, the resistance of described the 3rd resistance is 800-1200 ohm.
Further, the resistance of described the second resistance is 800-1200 ohm.
Further, the resistance of described the first resistance is 9000-11000 ohm.
The beneficial effects of the utility model are: adopt the external photoelectric isolating circuit of pulsewidth modulation (PWM) hardware cell and drive circuit in single-chip microcomputer to form PWM arrangements for speed regulation, the rotating speed of blower fan is with temperature raise (wherein temperature transducer is contained on power amplifier).On a powerful short wave transmitter, there are tens blower fans.If without circuit of the present invention, after start, sound is deafening.Used after circuit of the present invention, greatly reduced short wave transmitter noise, purified working environment, also reduced the power consumption of blower fan, improved the efficiency of commutator.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
In figure, D14 is photoelectric isolating circuit, and V41 is drive circuit, and V42 is rectification diode IN4004, and JP1 is the two switches of putting of hilted broadsword.
Embodiment
As shown in Figure 1, a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation, comprise temperature sensing circuit, single-chip microcomputer, photoelectric isolating circuit D14 and drive circuit V41.Drive circuit V41 comprises the second resistance R 127 and the metal-oxide-semiconductor 2SK1382 of 128,1000 ohm of first resistance R of 10000 ohm, grid one tunnel of metal-oxide-semiconductor is connected in series the first resistance R 128 and by the first resistance R 128, is connected to the high-voltage power of short wave transmitter heat radiation DC fan, the grid Yi in parallel road of metal-oxide-semiconductor is connected in series the second resistance R 127, also by the second resistance R 127, connects the power cathode of DC fans, and the source electrode of metal-oxide-semiconductor connects the power cathode of DC fan.
Temperature sensing circuit is installed on the power amplifier of short wave transmitter, and temperature sensing circuit output end signal is connected to the input end of single-chip microcomputer; Described single-chip microcomputer output end signal is connected to photoelectric isolating circuit negative electrode, the anode of photoelectric isolating circuit by the 3rd resistance R 126 signals of 1000 ohm that are provided be connected to photoelectric isolating circuit+working power of 5V.The collector signal of photoelectric isolating circuit is connected to the grid of metal-oxide-semiconductor, the emitter of photoelectric isolating circuit connects the power cathode of short wave transmitter heat radiation DC fan.
Drain electrode one tunnel of metal-oxide-semiconductor is connected to the positive pole of rectification diode IN4004, Yi in parallel road is connected to two the first stationary contacts of putting switch of hilted broadsword, the negative pole of rectification diode is connected to the high-voltage power of short wave transmitter heat radiation DC fan, and two the second stationary contacts of putting switch JP1 of hilted broadsword locate with moving the power cathode that contact is all connected short wave transmitter heat radiation DC fan.
Temperature sensing circuit (LM35DH+LM358) is installed on power amplifier, for the temperature of induced power amplifier, and temperature signal is converted to an analog voltage signal, transfers in ARM single-chip microcomputer.This analog voltage is at ARM-CPU(LPC2292FBD144) in through A/D converting unit, be quantized into data volume (temperature value).Pwm value timing output pwm value that pulsewidth modulation in single-chip microcomputer (PWM) hardware cell is converted into a PWM by the temperature value of power amplifier arrive corresponding register in pulsewidth modulation (PWM) unit.Its signal amplitude of the automatic output pulse width modulation signal of pwm unit hardware PWM+3.3V(of ARM-CPU inside is 3.3V).It is 5V that electrical level transferring chip on ARM single-chip microcomputer is converted to its signal amplitude of pulse-width signal PWM+5V(by PWM+3.3V), then output to the anode (2 pin) of photoelectric isolating circuit PC817, be coupled to again collector electrode (4 pin), and the grid of the metal-oxide-semiconductor 2SK1382 of collector electrode and driving tube V41 connects together, the bias voltage on grid is that high-voltage power (50V) dividing potential drop by blower fan obtains here.High-voltage power has just been separated by photoelectric isolating circuit PC817 completely with low tension power supply like this.Further, drive circuit signal is connected to short wave transmitter heat radiation DC fan, drives the work of short wave transmitter heat radiation DC fan.
The present embodiment adopts PWM arrangements for speed regulation to control the running speed of blower fan, adopts the external photoelectric isolating circuit of pulsewidth modulation (PWM) hardware cell and drive circuit in single-chip microcomputer to form PWM arrangements for speed regulation, and the rotating speed of blower fan raises with temperature.
On a powerful short wave transmitter, there are tens blower fans.If without the utility model circuit, after start, sound is deafening.Used after the utility model circuit, greatly reduced short wave transmitter noise, purified working environment, also reduced the power consumption of blower fan, improved the efficiency of commutator.
The utility model discloses as above with preferred embodiment, and so it is not in order to limit the utility model.Under the utility model, in technical field, have and conventionally know the knowledgeable, within not departing from spirit and scope of the present utility model, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is when being as the criterion depending on claims person of defining.
Claims (4)
1. short wave transmitter heat radiation DC fan PWM arrangements for speed regulation, is characterized in that: comprise temperature sensing circuit, single-chip microcomputer, photoelectric isolating circuit and drive circuit; Described drive circuit comprises the first resistance (R128), the second resistance (R127) and metal-oxide-semiconductor, grid one tunnel of described metal-oxide-semiconductor is connected in series the first resistance (R128), also by the first resistance (R128), is connected to the high-voltage power of short wave transmitter heat radiation DC fan, the grid Yi in parallel road of metal-oxide-semiconductor is connected in series the second resistance (R127), also by the second resistance (R127), connects the power cathode of described DC fan, and the source electrode of described metal-oxide-semiconductor connects the power cathode of described DC fan;
Described temperature sensing circuit is installed on the power amplifier of short wave transmitter, and temperature sensing circuit output end signal is connected to the input end of single-chip microcomputer; Described single-chip microcomputer output end signal is connected to photoelectric isolating circuit negative electrode, and the anode of photoelectric isolating circuit is connected to the working power of photoelectric isolating circuit by the 3rd resistance (R126) signal being provided with; The collector signal of described photoelectric isolating circuit is connected to the grid of metal-oxide-semiconductor, the emitter of photoelectric isolating circuit connects the power cathode of short wave transmitter heat radiation DC fan;
Drain electrode one tunnel of described metal-oxide-semiconductor is connected to the positive pole of rectification diode, Yi in parallel road is connected to two the first stationary contacts of putting switch of hilted broadsword, the negative pole of described rectification diode is connected to the high-voltage power of short wave transmitter heat radiation DC fan, and two the second stationary contacts of putting switch of described hilted broadsword locate with moving the power cathode that contact is all connected short wave transmitter heat radiation DC fan.
2. a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation according to claim 1, is characterized in that: the resistance of described the 3rd resistance (R126) is 800-1200 ohm.
3. a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation according to claim 1, is characterized in that: the resistance of described the second resistance (R127) is 800-1200 ohm.
4. a kind of short wave transmitter heat radiation DC fan PWM arrangements for speed regulation according to claim 1, is characterized in that: the resistance of described the first resistance (R128) is 9000-11000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420116977.5U CN203770183U (en) | 2014-03-14 | 2014-03-14 | PWM (Pulse-Width Modulation) speed control device for heat-dissipation direct current fan of short-wave transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420116977.5U CN203770183U (en) | 2014-03-14 | 2014-03-14 | PWM (Pulse-Width Modulation) speed control device for heat-dissipation direct current fan of short-wave transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203770183U true CN203770183U (en) | 2014-08-13 |
Family
ID=51287379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420116977.5U Expired - Fee Related CN203770183U (en) | 2014-03-14 | 2014-03-14 | PWM (Pulse-Width Modulation) speed control device for heat-dissipation direct current fan of short-wave transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203770183U (en) |
-
2014
- 2014-03-14 CN CN201420116977.5U patent/CN203770183U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |