CN207573224U - A kind of isolation feedback module and power supply for Switching Power Supply - Google Patents
A kind of isolation feedback module and power supply for Switching Power Supply Download PDFInfo
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- CN207573224U CN207573224U CN201721636388.XU CN201721636388U CN207573224U CN 207573224 U CN207573224 U CN 207573224U CN 201721636388 U CN201721636388 U CN 201721636388U CN 207573224 U CN207573224 U CN 207573224U
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Abstract
The utility model is related to a kind of isolation feedback module for Switching Power Supply, including error signals modulate unit, high frequency signal transmission unit and error signal demodulating unit；Wherein described error signals modulate unit generates a high-frequency carrier signal, and the high-frequency carrier signal is modulated using the error signal of power supply secondary, obtains the high-frequency signal for including the error signal；The high frequency signal transmission unit by the high-frequency signal by Switching Power Supply secondary transmission to primary, and the error signal for being demodulated system by the error signal demodulating unit and being restored, and the error signal of recovery is transported in system control unit, control output voltage.The utility model further relates to a kind of Switching Power Supply using above-mentioned isolation feedback module.Implement a kind of isolation feedback module and power supply for Switching Power Supply of the utility model, have the advantages that：Governing speed is very fast, long lifespan, and parameter is not substantially influenced by ambient temperature.
Description
Technical field
The utility model is related to field of power supplies, more specifically to a kind of isolation feedback module for Switching Power Supply
And power supply.
Background technology
In isolation type switch power converter, need to keep apart the secondary and primary of power transformer, this is just related to
And to need design one isolation feedback signal transmission circuit.In general, output voltage is fed back to the driving wave of switch
In shape or drive waveforms generator so that the parameter of switch changes with the feedback signal, and then realizes the control to output voltage,
It is more typical control method.In isolated converter, this function is realized, need isolator to transmit the feedback signal,
The signal is obtained in a ground potential, and the signal is used in another ground potential.In the prior art, it is typically to make
The signal transmission of (i.e. primary and secondary side between) is realized with photoelectrical coupler between transformer primary and secondary.Although this method
Comparative maturity, also fairly simple, still, for this method using photoelectric coupler isolation, shortcoming is also very
Significantly, these shortcomings include that reaction speed is relatively slow, short life, Parameters variation (such as variation of ambient temperature bring optical attenuation)
It is serious etc..
Utility model content
The technical problem to be solved by the present invention is to, for the prior art above-mentioned governing speed is relatively slow, short life,
The defects of Parameters variation is serious, provides that a kind of governing speed is very fast, long lifespan, and one kind that parameter will not change substantially is for switching
The isolation feedback module and power supply of power supply.
Technical solution is used by the utility model solves its technical problem：Construct a kind of isolation for Switching Power Supply
Feedback module, including error signals modulate unit, high frequency signal transmission unit and error signal demodulating unit；Wherein described error
Signal modulation unit generates a high-frequency carrier signal, and the high-frequency carrier signal is adjusted using the error signal of power supply secondary
System, obtains the high-frequency signal for including the error signal；The high frequency signal transmission unit is by the high-frequency signal by switch electricity
The secondary transmission in source is to primary, and the error letter for being demodulated system by the error signal demodulating unit and being restored
Number, and the error signal of recovery is transported in system control unit, control output voltage.
Further, the error signal is compared by the output voltage and reference voltage of the Switching Power Supply and obtained, institute
It states error signals modulate unit and includes a comparison for the output voltage and the reference voltage of the Switching Power Supply
Device.
Further, the error signals modulate unit further includes one and is converted to the high frequency carrier of input by square wave
The waveform conversion module of triangular wave and the operation mould for being compared the output of the waveform conversion module with the error signal
Block, the computing module export high-frequency signal, which is that frequency is certain and duty ratio is determined by the error signal
High frequency square wave.
Further, the high frequency carrier includes being generated by microcontroller and being transported to the side of the waveform conversion module
Wave.
Further, the waveform conversion module include first resistor, the first capacitance and the first diode, described first
Capacitance one end is grounded, and the other end is connect with the anode of first diode, and the first resistor is attempted by the one or two pole
Pipe both ends, high frequency carrier are inputted by the cathode of first diode, and triangular wave is exported simultaneously by the anode of first diode
An input terminal of the computing module is connected to, another input terminal of the computing module inputs the error signal,
Output terminal is connect with the high frequency signal transmission unit.
Further, the high frequency signal transmission unit includes digital isolator or high-frequency isolation transformer.
Further, the high frequency signal transmission unit includes two connectivity ports, and a connectivity port should with being located at
The circuit connection of switch power supply secondary, another port are connect with the primary circuit of the Switching Power Supply；The described Switching Power Supply
Secondary circuit include error signals modulate unit, the primary circuit of the Switching Power Supply includes error signal demodulation
Unit.
Further, the error signal demodulating unit receives the high frequency from described high frequency signal transmission unit one end
Signal carries out signal conversion to it, obtain recovery, there is the error signal of analog voltage, and by the signal transmission
To the system control unit.
Further, the error signal demodulating unit includes the second capacitance and second resistance, second capacitance one
End ground connection, the other end are connect with described second resistance one end, and the other end of the second resistance is connected to the system control
Unit, the high-frequency signal is inputted by second capacitance and the tie point of second resistance, by the other end of the second resistance
Export the error signal restored.
The utility model further relates to a kind of Switching Power Supply, and the error voltage that secondary generates is transferred to primary including being used for
Feedback module is isolated, the isolation feedback module includes the isolation feedback module of above-mentioned any one.
Implement a kind of isolation feedback module and power supply for Switching Power Supply of the utility model, have below beneficial to effect
Fruit：Since error signal being compared with the triangular wave set, the high frequency side that its duty ratio is decided by the error signal is formed
The high frequency square wave is coupled to the primary of power transformer by magnetic induction or high frequency transformer, handles, take to it by wave
Go out to be included in the error signal component in the high frequency square wave, so as to realize the control to switching drive signal.In entire mistake
In journey and photoelectrical coupler is not applied to, there would not be photoelectrical coupler yet.Therefore, governing speed is very fast, the service life
Long, parameter is not substantially influenced by ambient temperature.
Description of the drawings
Fig. 1 is isolation module in a kind of isolation feedback module and power supply embodiment for Switching Power Supply of the utility model
Structure diagram；
Fig. 2 is the further circuit diagram of the isolation module in the embodiment.
Specific embodiment
The utility model embodiment is described further below in conjunction with attached drawing.
As shown in Figure 1, in a kind of isolation feedback module embodiment for Switching Power Supply of the utility model, this is used for
It is single that the isolation feedback module of Switching Power Supply includes error signals modulate unit, high frequency signal transmission unit and error signal demodulation
Member；Wherein described error signals modulate unit generates a high-frequency carrier signal, using the error signal of power supply secondary to the height
Frequency carrier signal is modulated or compares, and obtains the high-frequency signal including the error signal component, i.e. the high-frequency signal
Carry error signal component；And the high-frequency signal (is by the high frequency signal transmission unit by the secondary of Switching Power Supply
System secondary) it is transferred to primary (i.e. system primary side), and be demodulated system by the error signal demodulating unit and be restored
The error signal, and the error signal of recovery is transported in system control unit, controls output voltage so that defeated
Go out voltage gradually to approach to the voltage value of setting.In other words, in the utility model, pass through the error obtained by output voltage
Error voltage and reference voltage are compared or operation, feedback voltage are obtained, by the feedback voltage and a triangular wave by voltage
High-frequency signal compares, and obtains a high-frequency square-wave signal for carrying above-mentioned error signal information, then passes through digital transmission unit
Or the high-frequency square-wave signal is transferred to system primary side (i.e. the primary of the switch transformer of Switching Power Supply) by high frequency transformer, is being
Primary side of uniting takes out error signal component of the above-mentioned carrying in high frequency square wave, restores above-mentioned feedback signal, then by the recovery
Feedback signal is for controlling the drive signal that the port of main primary is simple eye output, so as to fulfill the control to output voltage.
Fig. 2 shows in the case of a kind of in the present embodiment for the isolation feedback module of Switching Power Supply more specifically structure
Schematic diagram, it is in fig. 2, electric with benchmark after the electric resistance partial pressure that the error signal passes through setting by the output voltage of the Switching Power Supply
Pressure ratio compared with and obtain, the error signals modulate unit includes an output voltage for the Switching Power Supply through excessive
The comparator of pressure value and the reference voltage.In fig. 2, the partial pressure of above-mentioned output voltage is realized by two resistance, defeated
Go out voltage to be inputted by one end of a resistance, one end of another resistance is entered by its other end, another resistance
Other end is grounded, and the voltage exported by the connecting pin of above-mentioned two resistance is above-mentioned partial pressure, and the resistance value of two resistance is thing
First set.
And the error signals modulate unit further includes one and the high frequency carrier of input is converted to triangular wave by square wave
Waveform conversion module and the computing module for being compared the output of the waveform conversion module with the error signal, the fortune
Calculate module output high-frequency signal, the high frequency square wave that the high-frequency signal is certain for frequency and duty ratio is determined by the error signal.
Wherein, the high frequency carrier includes being generated by a microcontroller for being arranged on system secondary and passing through an input/output port
It is transported to the square wave of the waveform conversion module.The waveform conversion module includes first resistor R1, the first capacitance C1 and first
Diode D1, the first capacitance C1 one end ground connection, the other end are connect with the anode of the first diode D1, first electricity
Resistance R1 is attempted by the first diode D1 both ends, and high frequency carrier is (i.e. by the output of the input/output port of above-mentioned microcontroller
Square wave) it is inputted by the cathode of the first diode D1, triangular wave is exported by the anode of the first diode D1 and is connected to
One input terminal of the computing module, another input terminal of the computing module input the error signal, output terminal
It is connect with the high frequency signal transmission unit.The computing module is a comparator, by comparing on two input terminal
Voltage determines the height of the level of its output, since level of the above-mentioned error signal in comparison procedure is constant, and triangle
The level of wave is variation, and therefore, the level height of error signal determines the high-frequency square-wave signal of above-mentioned computing module output
High level time length.Therefore, the high level time of above-mentioned high frequency square wave actually carries the electricity of above-mentioned error signal
It is flat.
In the present embodiment, the high frequency signal transmission unit includes digital isolator or high-frequency isolation transformer.It is described
High frequency signal transmission unit includes two connectivity ports, and a connectivity port is connect with the circuit positioned at the switch power supply secondary,
Its another port is connect with the primary circuit of the Switching Power Supply；The secondary circuit of the Switching Power Supply includes error signal
Modulation unit, the primary circuit of the Switching Power Supply include the error signal demodulating unit.I.e. above-mentioned high-frequency square-wave signal
It is transported on the secondary ports of above-mentioned high frequency signal transmission unit；And error signal demodulating unit is connected to above-mentioned high-frequency signal and passes
On the primary port of defeated unit.
It is right when the error signal demodulating unit receives the high-frequency signal from described high frequency signal transmission unit one end
It carries out signal conversion, obtains an error signal restoring, with analog voltage, and transmit the signal to the system
System control unit.The error signal demodulating unit includes the second capacitance and second resistance, and described second capacitance one end is grounded,
The other end is connect with described second resistance one end, and the other end of the second resistance is connected to the system control unit, described
High-frequency signal is inputted by second capacitance and the tie point of second resistance, is restored by the other end output of the second resistance
The error signal.That is, low frequency filtering is carried out for above-mentioned high-frequency square-wave signal, it is possible to it is above-mentioned to obtain above-mentioned expression
The direct current component of error signal is transported to the drive waveforms that system control unit exports system control unit and controls
System.
The utility model further relates to a kind of Switching Power Supply, and the error voltage that secondary generates is transferred to primary including being used for
Feedback module is isolated, the isolation feedback module includes above-mentioned isolation feedback module.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of isolation feedback module for Switching Power Supply, which is characterized in that including error signals modulate unit, high-frequency signal
Transmission unit and error signal demodulating unit；Wherein described error signals modulate unit generates a high-frequency carrier signal, uses
The error signal of power supply secondary is modulated the high-frequency carrier signal, obtains the high-frequency signal for including the error signal；Institute
State high frequency signal transmission unit by the high-frequency signal by Switching Power Supply secondary transmission to primary, and pass through the error signal
The error signal that demodulating unit is demodulated system and is restored, and the error signal of recovery is transported to system control
In unit processed, output voltage is controlled.
2. the isolation feedback module according to claim 1 for Switching Power Supply, which is characterized in that the error signal by
The output voltage and reference voltage of the Switching Power Supply, which compare, to be obtained, and the error signals modulate unit includes one for comparing
The comparator of the output voltage of the Switching Power Supply and the reference voltage.
3. the isolation feedback module according to claim 2 for Switching Power Supply, which is characterized in that the error signal tune
Unit processed further includes a high frequency carrier by input and is converted to the waveform conversion module of triangular wave and by the waveform by square wave
The computing module that output and the error signal of conversion module are compared, the computing module export high-frequency signal, the height
The high frequency square wave that frequency signal is certain for frequency and duty ratio is determined by the error signal.
4. the isolation feedback module according to claim 3 for Switching Power Supply, which is characterized in that the high frequency carrier packet
Include the square wave for being generated by microcontroller and being transported to the waveform conversion module.
5. the isolation feedback module according to claim 4 for Switching Power Supply, which is characterized in that the waveform becomes mold changing
Block includes first resistor, the first capacitance and the first diode, the first capacitance one end ground connection, the other end and the one or two pole
The anode connection of pipe, the first resistor are attempted by the first diode both ends, and high frequency carrier is by first diode
Cathode inputs, and exports triangular wave by the anode of first diode and is connected to an input terminal of the computing module, institute
Another input terminal for stating computing module inputs the error signal, and output terminal is connect with the high frequency signal transmission unit.
6. the isolation feedback module according to claim 5 for Switching Power Supply, which is characterized in that the high-frequency signal passes
Defeated unit includes digital isolator or high-frequency isolation transformer.
7. the isolation feedback module according to claim 6 for Switching Power Supply, which is characterized in that the high-frequency signal passes
Defeated unit includes two connectivity ports, and a connectivity port is connect with the circuit positioned at the switch power supply secondary, another port
It is connect with the primary circuit of the Switching Power Supply；The secondary circuit of the Switching Power Supply includes error signals modulate unit,
The primary circuit of the Switching Power Supply includes the error signal demodulating unit.
8. the isolation feedback module according to claim 7 for Switching Power Supply, which is characterized in that the error signal solution
Adjust unit receive the high-frequency signal from described high frequency signal transmission unit one end, signal conversion is carried out to it, obtain one it is extensive
Error signal multiple, with analog voltage, and transmit the signal to the system control unit.
9. the isolation feedback module according to claim 8 for Switching Power Supply, which is characterized in that the error signal solution
Unit is adjusted to include the second capacitance and second resistance, the second capacitance one end ground connection, the other end and described second resistance one end
Connection, the other end of the second resistance are connected to the system control unit, the high-frequency signal by second capacitance and
The tie point input of second resistance, the error signal restored by the other end output of the second resistance.
10. the error voltage that secondary generates is transferred to primary isolation feedback module by a kind of Switching Power Supply including being used for, special
Sign is that the isolation feedback module is included such as the isolation feedback module of any one in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721636388.XU CN207573224U (en) | 2017-11-29 | 2017-11-29 | A kind of isolation feedback module and power supply for Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721636388.XU CN207573224U (en) | 2017-11-29 | 2017-11-29 | A kind of isolation feedback module and power supply for Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN207573224U true CN207573224U (en) | 2018-07-03 |
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ID=62689013
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721636388.XU Active CN207573224U (en) | 2017-11-29 | 2017-11-29 | A kind of isolation feedback module and power supply for Switching Power Supply |
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| Country | Link |
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| CN (1) | CN207573224U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261757A (en) * | 2019-06-10 | 2019-09-20 | 南京宏泰半导体科技有限公司 | A kind of number isolating chip test method and system |
| CN111726011A (en) * | 2020-07-27 | 2020-09-29 | 上海川土微电子有限公司 | Digital isolator circuit comprising integrated isolated DC-DC and digital isolator comprising circuit |
-
2017
- 2017-11-29 CN CN201721636388.XU patent/CN207573224U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261757A (en) * | 2019-06-10 | 2019-09-20 | 南京宏泰半导体科技有限公司 | A kind of number isolating chip test method and system |
| CN111726011A (en) * | 2020-07-27 | 2020-09-29 | 上海川土微电子有限公司 | Digital isolator circuit comprising integrated isolated DC-DC and digital isolator comprising circuit |
| CN111726011B (en) * | 2020-07-27 | 2022-03-01 | 上海川土微电子有限公司 | Digital isolator circuit comprising integrated isolated DC-DC and digital isolator comprising circuit |
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Address after: 518000 5th floor, building A5, Zhiyuan, 1001 Xueyuan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Haowen Electronics Co.,Ltd. Address before: 518000 5th floor, building A5, Zhiyuan, 1001 Xueyuan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: HAWAN ELECTRONICS Co.,Ltd. |