CN204103766U - Based on the pulse frequency modulation circuit of RC oscillator - Google Patents
Based on the pulse frequency modulation circuit of RC oscillator Download PDFInfo
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- CN204103766U CN204103766U CN201420549861.0U CN201420549861U CN204103766U CN 204103766 U CN204103766 U CN 204103766U CN 201420549861 U CN201420549861 U CN 201420549861U CN 204103766 U CN204103766 U CN 204103766U
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Abstract
The utility model relates to electronic technology field, is specifically related to a kind of pulse frequency modulation circuit based on RC oscillator.Wherein, comprise a signal input part, in order to export a variable voltage signal; One buffer circuit, connects input, in order under the effect of a control signal, variable voltage signal is converted into the current signal matched with it and exports; One RC oscillating circuit, connects isolation voltage, under being used to the effect of control signal, switches between charge mode and discharge mode, and forms an oscillator signal output; One drive circuit, connects RC oscillating circuit, exports in order to form a pulse-modulated signal according to oscillator signal.Compared with prior art, the utility model has the following advantages: by the operating current size of adjustment RC oscillating circuit, thus change frequency of oscillation, the final frequency realizing adjustment clock signal, obtain the pulse-modulated signal needed, improve the antijamming capability of circuit, realize the object of the ripple reducing output voltage simultaneously.
Description
Technical field
The utility model relates to electronic technology field, is specifically related to a kind of pulse frequency modulation circuit based on RC oscillator.
Background technology
Oscillator is used to produce the electronic component repeating electric signal (normally sinusoidal wave or square wave).Its circuit formed is oscillating circuit.Direct current can be converted to the electronic circuit or device with the output of certain frequency ac signal.RC oscillator is circuit comparatively conventional among oscillator; regulating in prior art with RC is the frequency of oscillation of oscillation source chip, such as: 555 timers etc., can exist disturbing mutually of front and back circuit usually; such as when circuit current potential difference in front and back is larger, circuit can be caused normally to work.
Utility model content
For the deficiencies in the prior art, the pulse frequency modulation circuit that the utility model provides antijamming capability strong,
Based on a pulse frequency modulation circuit for RC oscillator, wherein, comprise
One signal input part, in order to export a variable voltage signal;
One buffer circuit, connects described input, in order under the effect of a control signal, described variable voltage signal is converted into the current signal matched with it and exports;
One RC oscillating circuit, connects described isolation voltage, under being used to the effect of described control signal, switches between charge mode and discharge mode, and forms an oscillator signal output;
One drive circuit, connects described RC oscillating circuit, exports in order to form a pulse-modulated signal according to described oscillator signal.
Preferably, described buffer circuit, formed primarily of a photoelectrical coupler, described photoelectrical coupler has the first input pin, the second input pin, the first output pin, the second output pin,
Described first input pin connects the output of institute's signal input part, and described second input pin is by the first grounding through resistance;
Described first output pin, described second output pin connect the input of described RC oscillating circuit respectively, are connected with the second resistance between described first output pin, described second output pin.
Preferably, described RC oscillating circuit comprises the first output, the second output,
Described first output connects the input that one of described drive circuit matches with it;
Described second output connects the input that one of described drive circuit matches with it.
Preferably, described RC oscillating circuit primarily of the first diode, the second diode, the 3rd diode, the 4th diode, the first electric capacity,
Described first diode is connected between the first output pin of described buffer circuit and described second output;
Described second diode is connected between the second output pin of described buffer circuit and described second output;
Described 3rd diode is connected between the first output pin of described buffer circuit and described first output;
Described 4th diode is connected between the second output pin of described buffer circuit and described first output,
Described first electric capacity connect and between described second output and ground.
Preferably, described drive circuit is the driver that an inside has Frequency Adjustable oscillating circuit.
Preferably, described drive circuit is formed primarily of IR2153 chip.
Preferably, described first output of described RC oscillating circuit connects the RT pin of described IR2153 chip;
Described second output of described RC oscillating circuit connects the CT pin of described IR2153 chip.
Preferably, described photoelectrical coupler is formed primarily of TLP785 chip.
Compared with prior art, the utility model has the following advantages: by the operating current size of adjustment RC oscillating circuit, thus change frequency of oscillation, the final frequency realizing adjustment clock signal, obtain the pulse-modulated signal needed, improve the antijamming capability of circuit, realize the object of the ripple reducing output voltage simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of the utility model based on the optimum embodiment of pulse frequency modulation circuit of RC oscillator,
Wherein 1, signal input part; 2, buffer circuit; 3, RC oscillating circuit; 4, drive circuit; 21, the first input pin; 22, the second input pin; 23, the first output pin; 24, the second output pin; 31, the first output; 32, the second output.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
As shown in Figure 1, a kind of pulse frequency modulation circuit based on RC oscillator, wherein, comprising:
One signal input part 1, in order to export a variable voltage signal;
One buffer circuit 2, connects input, in order under the effect of control signal, variable voltage signal is converted into the current signal matched with it and exports;
One RC oscillating circuit 3, connects isolation voltage, under being used to the effect of control signal, switches between charge mode and discharge mode, and forms an oscillator signal output;
One drive circuit 4, connects RC oscillating circuit 3, exports in order to form a pulse-modulated signal according to oscillator circuit signal.
Operation principle of the present utility model is:
Signal input part 1 exports a variable voltage signal, make output one variable current of buffer circuit 2 to RC oscillating circuit 3, by changing the input current of RC oscillating circuit 3, can change the discharge and recharge time of RC oscillating circuit 3, thus the pulse signal forming a Frequency Adjustable is exported by drive circuit 4.By the operating current size of adjustment RC oscillating circuit 3, thus change frequency of oscillation, the final frequency realizing adjustment clock signal, obtains the pulse-modulated signal needed, and improves the antijamming capability of circuit, realizes the object of the ripple reducing output voltage simultaneously.
As further preferred embodiment, buffer circuit 2 is formed primarily of a photoelectrical coupler, and photoelectrical coupler is formed primarily of TLP785 chip.Adopt TLP785 chip to make circuit structure simple, duty ratio is adjustable, and antijamming capability is strong, and isolation performance is fine, and photoelectrical coupler belongs to current mode device, can effectively suppress voltage endurance noise, improves the stability of circuit.
Described first input pin 21 connects the output of institute's signal input part 1, and described second input pin 22 is by one first grounding through resistance;
Described first output pin 23, described second output pin 24 connect described RC oscillating circuit 3 respectively) input, be connected with the second resistance between described first output pin 23, described second output pin 24.
First output pin 23, second output pin 24 connects the input of RC oscillating circuit 3 respectively.By changing the input voltage of signal input part 1, can electric current between the first input pin 21 and the second input pin 22, and then the electric current changed between the first output pin 23 and the second output pin 24, namely change the discharge and recharge time of RC oscillating circuit 3, the oscillator signal forming a changeable frequency is exported by drive circuit 4.By the signal that signal and the drive circuit 4 of the input of photocoupler isolation signals input 1 export, improve the antijamming capability of circuit further.
As further preferred embodiment, RC oscillating circuit 3 comprises the first output 31, second output 32, and drive circuit 4 is the driver that an inside has Frequency Adjustable oscillating circuit.
First output 31 connects the input that one of drive circuit 4 matches with it;
Second output 32 connects the input that one of drive circuit 4 matches with it.
As further preferred embodiment, RC oscillating circuit 3 is primarily of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first electric capacity C1.When signal input part 1 does not input, the second electric capacity and the first electric capacity C1 form initial oscillation.
First diode is connected between the first output pin 23 of buffer circuit 2 and the second output 32;
Second diode D2 is connected between the second output pin 24 of buffer circuit 2 and the second output 32;
3rd diode D3 is connected between the first output pin 23 of buffer circuit 2 and the first output 31;
4th diode D4 is connected between the second output pin 24 of buffer circuit 2 and the first output 31.
First electric capacity C1 is connected between the second output 32 and ground.
Drive circuit 4 is formed primarily of IR2153 chip.First output 31 of RC oscillating circuit 3 connects the RT pin of IR2153 chip;
Second output 32 of RC oscillating circuit 3 connects the CT pin of IR2153 chip.
Under RC oscillating circuit 3 is in charge mode, second diode D2 and the 3rd diode D3 conducting, first electric capacity C1 charges, under circuit is in discharge mode, first diode and the 4th diode D4 conducting, first electric capacity C1 discharges, and by changing charging current or the discharging current of electric current, thus changes charging interval or the discharge time of circuit.
These are only the utility model preferred embodiment; not thereby execution mode of the present utility model and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilization the utility model specifications and diagramatic content and apparent change obtain in protection range of the present utility model.
Claims (8)
1. based on a pulse frequency modulation circuit for RC oscillator, it is characterized in that, comprise
One signal input part (1), in order to export a variable voltage signal;
One buffer circuit (2), connects described input, in order under the effect of a control signal, described variable voltage signal is converted into the current signal matched with it and exports;
One RC oscillating circuit (3), connects described isolation voltage, under being used to the effect of described control signal, switches between charge mode and discharge mode, and forms an oscillator signal output;
One drive circuit (4), connects described RC oscillating circuit (3), exports in order to form a pulse-modulated signal according to described oscillator signal.
2. the pulse frequency modulation circuit based on RC oscillator according to claim 1, is characterized in that,
Described buffer circuit (2), formed primarily of a photoelectrical coupler, described photoelectrical coupler has the first input pin (21), the second input pin (22), the first output pin (23), the second output pin (24)
Described first input pin (21) connects the output of institute's signal input part (1), and described second input pin (22) is by one first grounding through resistance;
Described first output pin (23), described second output pin (24) connect the input of described RC oscillating circuit (3) respectively, are connected with the second resistance between described first output pin (23), described second output pin (24).
3. the pulse frequency modulation circuit based on RC oscillator according to claim 1, is characterized in that, described RC oscillating circuit (3) comprises the first output (31), the second output (32),
Described first output (31) connects an input matched with it of described drive circuit (4);
Described second output (32) connects an input matched with it of described drive circuit (4).
4. the pulse frequency modulation circuit based on RC oscillator according to claim 3, is characterized in that, described RC oscillating circuit (3) primarily of the first diode, the second diode, the 3rd diode, the 4th diode, the first electric capacity,
Described first diode is connected between first output pin (23) of described buffer circuit (2) and described second output (32);
Described second diode is connected between second output pin (24) of described buffer circuit (2) and described second output (32);
Described 3rd diode is connected between first output pin (23) of described buffer circuit (2) and described first output (31);
Described 4th diode is connected between second output pin (24) of described buffer circuit (2) and described first output (31),
Described first electric capacity connect and between described second output (32) and ground.
5. the pulse frequency modulation circuit based on RC oscillator according to claim 1, is characterized in that, described drive circuit (4) is the driver that an inside has Frequency Adjustable oscillating circuit.
6. the pulse frequency modulation circuit based on RC oscillator according to claim 3, is characterized in that, described drive circuit (4) is formed primarily of IR2153 chip.
7. the pulse frequency modulation circuit based on RC oscillator according to claim 6, is characterized in that,
Described first output (31) of described RC oscillating circuit (3) connects the RT pin of described IR2153 chip;
Described second output (32) of described RC oscillating circuit (3) connects the CT pin of described IR2153 chip.
8. the pulse frequency modulation circuit based on RC oscillator according to claim 2, is characterized in that, described photoelectrical coupler is formed primarily of TLP785 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420549861.0U CN204103766U (en) | 2014-09-23 | 2014-09-23 | Based on the pulse frequency modulation circuit of RC oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420549861.0U CN204103766U (en) | 2014-09-23 | 2014-09-23 | Based on the pulse frequency modulation circuit of RC oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204103766U true CN204103766U (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420549861.0U Expired - Lifetime CN204103766U (en) | 2014-09-23 | 2014-09-23 | Based on the pulse frequency modulation circuit of RC oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088538A (en) * | 2018-10-19 | 2018-12-25 | 珠海格力电器股份有限公司 | Frequency modulation device, switching power supply and frequency modulation method thereof |
-
2014
- 2014-09-23 CN CN201420549861.0U patent/CN204103766U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109088538A (en) * | 2018-10-19 | 2018-12-25 | 珠海格力电器股份有限公司 | Frequency modulation device, switching power supply and frequency modulation method thereof |
| US11728726B2 (en) | 2018-10-19 | 2023-08-15 | Gree Electric Appliances, Inc. Of Zhuhai | Frequency modulation device, switching power supply and frequency modulation method thereof |
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