CN208939830U - A kind of isolation detection route of digital switch power supply medium-long range switching signal - Google Patents
A kind of isolation detection route of digital switch power supply medium-long range switching signal Download PDFInfo
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- CN208939830U CN208939830U CN201821869913.7U CN201821869913U CN208939830U CN 208939830 U CN208939830 U CN 208939830U CN 201821869913 U CN201821869913 U CN 201821869913U CN 208939830 U CN208939830 U CN 208939830U
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Abstract
The utility model provides a kind of isolation detection route of digital switch power supply medium-long range switching signal, the route includes a decompression modulator chip, one the second isolating transformer, one primary side auxiliary power supply route, one secondary side auxiliary power supply route, a voltage signal sampling route, it is characterised in that, remote switch signal realizes the state-detection to remote switch signal by a first resistor and primary side auxiliary power supply connection, by fine adjustment auxiliary power supply voltage.The route does not increase any device, and reduce an optocoupler, allow numerous digital switch power supplys that can obtain the state of primary side remote switch signal simply by voltage sample, to save space, complexity is reduced, realizes that primary side remote switch controls the scheme provided convenience for digital switch power supply.
Description
Technical field
The utility model relates to Switching Power Supply application fields, open more particularly to one kind for digital switch power supply medium-long range
The isolation detection route of OFF signal.
Background technique
In recent years, requirement of the market for Switching Power Supply is higher and higher, response speed is faster, more efficient, volume is smaller,
The lower development trend as Switching Power Supply of cost, traditional simulation control are just gradually difficult to realize these application demands.
And it comes into being using digital signal processor as the high power digital power technology of control core, and obtained very fast hair
Exhibition.Since the intelligence of digital power, the common of part allow it to the flexible demand for coping with different clients, this
Reduce development cycle and development cost.
But the controller of digital switch power supply be on secondary side, and remote switch control signal, that is, ON/OFF signal in original
Side, Yao Shixian remote switch control, is the scheme using light-coupled isolation under normal circumstances, ON/OFF signal is passed through light-coupled isolation
It is transferred to secondary side.The problem of program maximum is exactly that the volume of optocoupler is too big, can not on the power supply of some small volumes
It meets the requirements.
The utility model is directed to the isolation detection link of conventional digital Switching Power Supply ON/OFF signal, proposes a kind of new number
The isolation detection route of word switch primary power supply ON/OFF signal.
Utility model content
The technical issues of the utility model is solved is to provide a kind of isolation of digital switch power supply medium-long range switching signal
Detect route.
The utility model solves technical solution used by above-mentioned technical problem: a kind of digital switch power supply medium-long range is opened
The isolation detection route of OFF signal, the route include input filter route, Switching Power Supply primary side power lines, pass through one the
One isolating transformer is coupled with Switching Power Supply pair side rectifying circuit, a decompression modulator chip, second isolating transformer,
One primary side auxiliary power supply route, a secondary side auxiliary power supply route, a voltage signal sampling circuit, above-mentioned decompression modulator
The primary side winding of chip and the second isolating transformer, primary side auxiliary power supply connection, the secondary side of above-mentioned second isolating transformer
Winding and secondary side auxiliary power supply connection, voltage signal sampling circuit and secondary side auxiliary power supply connection, which is characterized in that
Remote switch signal is located at except switch power module ontology, by a first resistor and primary side auxiliary power supply connection,
The state-detection to remote switch signal is realized by fine adjustment auxiliary power supply voltage.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned drop
Pressing modulator chip includes first port a Vin, second port a SW, a third port BST and the 4th port
FB；Vin is that supply port is connected by the busbar voltage of the 5th resistance and Switching Power Supply；Second port SW exports PWM letter
Number, second capacitance connection with primary side auxiliary power supply route；Third port BST passes through a first capacitor and second port
SW connection.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned original
Side auxiliary power supply route includes second capacitor, a third capacitor, the 4th capacitor, a second resistance, one the
Three resistance, the 4th resistance, wherein the second capacitor and the series connection of the 4th resistance are connected across the second isolating transformer primary side winding two
End, in-between tie point connect third capacitor, the second port SW of the other end connection decompression modulator chip of the second capacitor, and the 4th
The other end of resistance connects one end of the 4th capacitor, the other end ground connection of the 4th capacitor, second resistance and 3rd resistor string
Connection, one end connect one end of the 4th capacitor, other end ground connection, and central connection point connects the other end and decompression of third capacitor
4th port FB of modulator chip.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned
Two capacitors, the 4th resistance and third capacitor constitute a closed circuit, keep primary side auxiliary power supply voltage VCC closed loop controllable.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned remote
Journey switching signal passes through the central point of connecting of a first resistor and the second resistance of primary side auxiliary power supply route and 3rd resistor
Connection, the voltage that remote switch signal participates in auxiliary power supply route are adjusted.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned remote
Cheng Kaiguan refers to an input pin ON/OFF foot of Switching Power Supply, and state is provided by outside line, or perhaps by
The application circuit of client provides, and has ground connection, hanging or three kinds of states of high level.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned pair
Side power supply line includes first rectifier diode, the 6th resistance, the 5th capacitor, wherein the sun of first diode
Pole connects vice-side winding one end of the second isolating transformer, and the cathode of first diode connects the 6th resistance, the 6th resistance it is another
Outer one end connects one end of the 5th capacitor, and output voltage is secondary side auxiliary power supply voltage, the other end and second of the 5th capacitor
The other end of isolating transformer vice-side winding connects the ground on secondary side together.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned electricity
Pressing signal sample circuit includes the 7th resistance, the 8th resistance, the 6th capacitor, the 7th resistance auxiliary connection side auxiliary
Supply voltage is connected with the 8th resistance is followed by ground, the 6th capacitor and the 8th resistor coupled in parallel, the voltage signal sampling electricity routing resistance
It is constituted in series and parallel with capacitor, linear narrowing is carried out to auxiliary line voltage.
Preferably, the isolation detection route of above-mentioned digital switch power supply medium-long range switching signal, which is characterized in that above-mentioned number
The main power lines of word switch power supply can be normal shock, flyback, bridge-type or other any Switching Power Supply power architectures.
The line construction does not increase any device, and reduces an optocoupler, so that numerous digital switch power supplys
The state of primary side remote switch signal can be obtained simply by voltage sample, to save space, reduce multiple
Miscellaneous degree realizes that primary side remote switch controls the scheme provided convenience for digital switch power supply.
Detailed description of the invention
Fig. 1 is the isolation detection conspectus of digital switch primary power supply ON/OFF signal.
Specific embodiment
The preferable one embodiment of the present invention is provided, with reference to the accompanying drawing the technical side of the utility model is described in detail
Case.
The utility model provides a kind of isolation detection route of digital switch power supply medium-long range switching signal.Reality in Fig. 1
Applying route includes input filter route, is made of input inductance Lin, input capacitance Cin, and input voltage vin passes through wave filtering wire
Voltage behind road is Vs, the primary side power lines of Vs connection switch power supply, and primary side power lines pass through one first isolation transformation
Device T100 is coupled with Switching Power Supply pair side rectifying circuit, a decompression modulator chip IC1, second isolating transformer 10,
One primary side auxiliary power supply route 20, a secondary side auxiliary power supply route 30, a voltage signal sampling circuit 50, IC1 passes through
One the 5th resistance R5 is connect with Vs, to first port Vin power, the primary side winding of a second port SW and 10 of IC1 and
One the second capacitor C2 connection of 20 routes, above-mentioned 10 vice-side winding are connect with the anode of a 30 first diode CR1.
IC1 also includes second port a SW, a third port BST and a 4th port FB, SW output PWM letter
Number, BST is connect by a first capacitor C1 with SW.20 include a second capacitor C2, a third capacitor C3, one the 4th
Capacitor C4, a second resistance R2, a 3rd resistor R3, a 4th resistance R4, wherein C2 and R4 series connection is connected across 10 originals
Side winding both ends, in-between tie point meet C3, and the other end of C2 connects SW, one end of the other end connection C4 of R4, i.e. primary side
The other end of auxiliary power supply voltage VCC, C4 are grounded, and R2 and R3 series connection, one end connect VCC, and other end ground connection, center connects
Contact connects the other end and FB of C3.C2, R4 and C3 constitute closed circuit, keep primary side auxiliary power supply voltage VCC closed loop controllable.
Remote switch herein refers to an input pin ON/OFF foot of Switching Power Supply, passes through a first resistor
R1 is connect with the series connection central point of R2 and R3, and the voltage signal of remote switch is provided by outside line, or perhaps by client's
Application circuit provides, and has ground connection, hanging or three kinds of states of high level.
30 routes include a first rectifier diode CR1, a 6th resistance R6, a 5th capacitor C5 in Fig. 1,
The cathode of CR1 connects R6, and R6 other end connects one end of C5, and C5 output voltage is pair side auxiliary power supply voltage VSEC, C5's
Other end connects the ground on secondary side together with the other end of 10 vice-side winding.Voltage signal sampling circuit 50 includes one the 7th
Resistance R7, a 8th resistance R8, a 6th capacitor C6, R7 auxiliary connection side auxiliary power supply voltage VSEC connects with R8 to be followed by
Ground, C6 is in parallel with R8, and the line routing resistance and capacitor are constituted in series and parallel, carries out linear narrowing to auxiliary line voltage.Because
The range that VSEC voltage generally can all be sampled beyond the single-chip microcontroller of digital switch power supply, needs to be compared by signal processing circuit
Example reduces.VSEC voltage is VAD01 after R7 and R8 partial pressure, and VAD01 enters the ADC input terminal of MCU.
Due to the line construction inside IC1, the voltage of the port FB can be stablized in 1.225V, when ON/OFF ground connection, it is hanging or
When person gives a high level, according to principle of stacking, VCC voltage has a corresponding voltage, by 10 turn ratio relationship, VSEC meeting
There is a corresponding voltage.
When ON/OFF ground connection, ON/OFF voltage is 0V, and calculation formula is as follows:
VCC=1.225*(R2+A)/A；
When ON/OFF is hanging, ON/OFF is equivalent to open circuit, and calculation formula is as follows:
VCC=1.225*( R2+R3)/R3
When ON/OFF applied voltage temporarily indicates that calculation formula is as follows with V1:
VCC=(1.225-V1*B/(R1+B))*(R2+A)/A
VSEC = VCC*Ns/Np - VF
Sampled voltage signal VAD01=VSEC*R8/ (R7+R8)
In above-mentioned formula, defining A is the class value after R1 and R3 in parallel, and B is the class value after R2 and R3 in parallel, and VF is CR1
Diode conduction voltage drop, Np, Ns are the number of turns of the former vice-side winding of the second isolating transformer 10 respectively.
When not considering diode drop VF, VSEC is linearly proportional with VCC, the different connection sides of ON/OFF
Formula has corresponded to different VAD01 voltage.That is, different VAD01 voltage ranges corresponds to the state of different ON/OFF,
The so voltage range of VSEC state for naturally also just corresponding to ON/OFF, we can be obtained current by the voltage of VSEC
The state of ON/OFF.
Although the foregoing describe the specific implementation cases of the utility model, it will be appreciated by those of skill in the art that
These are merely examples, under the premise of without departing substantially from the principles of the present invention and essence, can do to these case study on implementation
Various changes or modifications out.
Claims (9)
1. a kind of isolation detection route of digital switch power supply medium-long range switching signal, which includes input filter route, is opened
Primary power supply power lines are closed, are coupled by first isolating transformer with Switching Power Supply pair side rectifying circuit, a drop
Pressure modulator chip, second isolating transformer, a primary side auxiliary power supply route, a secondary side auxiliary power supply route, one
Primary side winding, the primary side auxiliary power supply of a voltage signal sampling circuit, above-mentioned decompression modulator chip and the second isolating transformer
Connection, the vice-side winding of above-mentioned second isolating transformer and secondary side auxiliary power supply connection, voltage signal sampling circuit
With secondary side auxiliary power supply connection, which is characterized in that remote switch signal passes through a first resistor and primary side auxiliary power supply
Connection realizes the state-detection to remote switch signal by fine adjustment auxiliary power supply voltage.
2. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In above-mentioned decompression modulator chip includes first port a Vin, second port a SW, a third port BST and one
4th port FB；Vin is supply port, is connected by the busbar voltage of the 5th resistance and Switching Power Supply；Second port SW
Output pwm signal, second capacitance connection with primary side auxiliary power supply route；Third port BST passes through a first capacitor
It is connect with second port SW.
3. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In above-mentioned primary side auxiliary power supply route includes second capacitor, a third capacitor, the 4th capacitor, second electricity
Resistance, a 3rd resistor, the 4th resistance, wherein the second capacitor and the series connection of the 4th resistance are connected across the second isolating transformer original
Side winding both ends, in-between tie point connect third capacitor, the second end of the other end connection decompression modulator chip of the second capacitor
Mouthful SW, the other end of the 4th resistance connect one end of the 4th capacitor, the other end ground connection of the 4th capacitor, second resistance and the
The series connection of three resistance, one end connect one end of the 4th capacitor, other end ground connection, and central connection point meets other the one of third capacitor
4th port FB of end and decompression modulator chip.
4. a kind of isolation detection route of digital switch power supply medium-long range switching signal as claimed in claim 3, feature exist
In above-mentioned second capacitor, the 4th resistance and third capacitor constitute a closed circuit, make primary side auxiliary power supply voltage VCC closed loop
Controllably.
5. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In above-mentioned remote switch signal passes through a first resistor and the second resistance of primary side auxiliary power supply route and the string of 3rd resistor
Join central point connection, the voltage that remote switch signal participates in auxiliary power supply route is adjusted.
6. a kind of isolation detection route of digital switch power supply medium-long range switching signal as claimed in claim 5, feature exist
In, above-mentioned remote switch refers to an input pin ON/OFF foot of Switching Power Supply, and state is provided by outside line, or
Person, which says, to be provided by the application circuit of client, there is ground connection, hanging or three kinds of states of high level.
7. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In above-mentioned Fu Bian power supply line includes first rectifier diode, the 6th resistance, the 5th capacitor, wherein first
The anode of diode connects vice-side winding one end of the second isolating transformer, and the cathode of first diode connects the 6th resistance, the
The other end of six resistance connects one end of the 5th capacitor, and output voltage is secondary side auxiliary power supply voltage, and the 5th capacitor is in addition
One end connects the ground on secondary side together with the other end of the second isolating transformer vice-side winding.
8. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In above-mentioned voltage signal sampling circuit includes the 7th resistance, the 8th resistance, the 6th capacitor, and the 7th resistance connects
It connects secondary side auxiliary power supply voltage to connect with the 8th resistance with being followed by, the 6th capacitor and the 8th resistor coupled in parallel, the voltage signal sampling
Electric routing resistance and capacitor are constituted in series and parallel, carry out linear narrowing to auxiliary line voltage.
9. a kind of isolation detection route of digital switch power supply medium-long range switching signal as described in claim 1, feature exist
In the main power lines of above-mentioned digital switch power supply can be normal shock, flyback, bridge-type or other any Switching Power Supplies
Power architecture.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194143A (en) * | 2018-11-13 | 2019-01-11 | 江苏兆能电子有限公司 | A kind of isolation detection route of digital switch power supply medium-long range switching signal |
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Address after: 212000 No.298, daijiamen Road, Zhenjiang high tech Zone, Zhenjiang City, Jiangsu Province Patentee after: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. Address before: No.99, dingmaojing 15th Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province, 212009 Patentee before: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. |