CN207382208U - A kind of power supply adaptor for improving POS cash register system stability - Google Patents
A kind of power supply adaptor for improving POS cash register system stability Download PDFInfo
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- CN207382208U CN207382208U CN201721176535.XU CN201721176535U CN207382208U CN 207382208 U CN207382208 U CN 207382208U CN 201721176535 U CN201721176535 U CN 201721176535U CN 207382208 U CN207382208 U CN 207382208U
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Abstract
The utility model discloses a kind of power supply adaptors for improving POS cash register system stability, including input filter circuit, rectification circuit, transformer, pwm control circuit and power switch circuit, the output terminal of input filter circuit is connected to the input terminal of rectification circuit, first input end of the output terminal of rectification circuit respectively with the first input end of pwm control circuit and transformer is connected, the output terminal of pwm control circuit is connected to the second input terminal of transformer by power switch circuit, the power end of pwm control circuit is connected to the 3rd input terminal of transformer, the output terminal of rectification circuit is also grounded.The utility model remains to work normally or steadily carry out data transmission in no ground line by the way that the mode of the output head grounding of rectification circuit to be accessed to the POS cash registers of power supply adaptor, the antijamming capability and stability of POS cash register systems are improved, it is relatively reliable.The utility model can be widely applied to electronic circuit field.
Description
Technical field
The utility model is related to electronic circuit field, especially a kind of power supply for improving POS cash register system stability is fitted
Orchestration.
Background technology
With the popularization consumed with no paper at all, POS (Point Of Sale, point of sale) cash register obtains in many fields
Using, such as large-scale catering shop, dining room, market, the popularization of POS cash registers accelerate the process of payment, provided for consumer
Very big facility.
However, in actual use, especially rural area is usually present with the situation of the no ground line of POS cash registers, holds
Easily leading to POS cash registers can not work normally or can not steadily carry out data transmission, and antijamming capability is poor, less reliable.
In this regard, lack effective solution in the industry at present.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is that：A kind of strong antijamming capability and reliable is provided,
Improve the power supply adaptor of POS cash register system stability.
Technical solution adopted in the utility model is：
A kind of power supply adaptor for improving POS cash register system stability, including input filter circuit, rectification circuit, change
Depressor, pwm control circuit and power switch circuit, the output terminal of the input filter circuit are connected to the input of rectification circuit
End, the output terminal of the rectification circuit connect respectively with the first input end of the first input end of pwm control circuit and transformer
It connects, the output terminal of the pwm control circuit is connected to the second input terminal of transformer by power switch circuit, described
The power end of pwm control circuit is connected to the 3rd input terminal of transformer, and the output terminal of the rectification circuit is also grounded.
Further, flow equalizing circuit, output filter circuit and feedback circuit, the input terminal of the flow equalizing circuit and change are further included
The output terminal connection of depressor, the output terminal of the flow equalizing circuit respectively with the input terminal of output filter circuit and feedback circuit the
One input terminal connects, and the output terminal of the output filter circuit is also connected with the second input terminal of feedback circuit, the feedback electricity
The output terminal on road and the second input terminal of pwm control circuit connect.
Further, the feedback circuit includes regulator circuit and photoelectrical coupler, the output terminal of the output filter circuit
It passes sequentially through regulator circuit and photoelectrical coupler and then is connected to the second input terminal of pwm control circuit, the photoelectrical coupler
Input terminal be additionally coupled to the output terminal of flow equalizing circuit.
Further, the input filter circuit includes fuse, thermistor, the first common mode inductance and the second common mode electricity
Sense, one end of the fuse are started to exchange fire line, and the other end of the fuse is connected to the first common mode electricity by thermistor
The first input end of sense, the second input terminal connecting zero line of first common mode inductance, the first output of first common mode inductance
End is connected with the first input end of the second common mode inductance, second output terminal and the second common mode inductance of first common mode inductance
Second input terminal connects, and the first input end of the first output terminal of second common mode inductance and rectification circuit connects, and described the
The second output terminal of two common mode inductances and the second input terminal of rectification circuit connect.
Further, the rectification circuit include the first rectifier diode, the second rectifier diode, the 3rd rectifier diode and
4th rectifier diode, the anode of first rectifier diode and the cathode of the second rectifier diode with the second common mode inductance
The connection of the first output terminal, the cathode of the 3rd rectifier diode and the anode of the 4th rectifier diode with the second common mode electricity
The second output terminal connection of sense, the cathode of first rectifier diode and the cathode of the 4th rectifier diode with transformer
First input end connects, and the anode of second rectifier diode and the anode of the 3rd rectifier diode are grounded.
Further, the transformer includes the first primary coil, the second primary coil and secondary coil, first primary side
The one end of the first end of coil respectively with the cathode of the first rectifier diode and the second primary coil is connected, first primary side
The output terminal of the second end of coil and power switch circuit connects, one end of second primary coil and pwm control circuit
First input end connects, the other end of second primary coil ground connection, one end of the secondary coil and flow equalizing circuit it is defeated
Enter end connection, the other end of the secondary coil is with being connected to lightning protection.
Further, the second end company of fly-wheel diode, the anode of the fly-wheel diode and the first primary coil is further included
It connects, the cathode of the fly-wheel diode is connected to the first end of the first primary coil.
Further, the pwm control circuit includes pwm chip, and it is enhanced that the power switch circuit includes N-channel
Field-effect tube, the feedback end of the pwm chip and the output terminal of feedback circuit connect, the power supply of the pwm chip
One end respectively with the cathode of the first rectifier diode and the second primary coil is held to be connected, the output of the pwm chip
End is connected to the grid of N-channel enhancement mode FET, the enhanced field-effect of Enable Pin and N-channel of the pwm chip
The source grounding of pipe, the drain electrode of the N-channel enhancement mode FET are connected to the second end of the first primary coil.
Further, the first electricity is also associated between the output terminal of the flow equalizing circuit and the input terminal of output filter circuit
Sense.
Further, indicating circuit is further included, the indicating circuit includes instruction resistance and indicator light, the output filtered electrical
For the output terminal on road by indicating that resistance is connected to the input terminal of indicator light, the output terminal of the indicator light is connected to lightning protection
Ground.
The beneficial effects of the utility model are：Including input filter circuit, rectification circuit, transformer, pwm control circuit and
Power switch circuit, the output head grounding of rectification circuit, by the way that the mode of the output head grounding of rectification circuit is accessed electricity
The POS cash registers of source adapter remain to work normally or steadily carry out data transmission in no ground line, improve POS cash registers
The antijamming capability and stability of machine system, it is relatively reliable.
Description of the drawings
Fig. 1 is a kind of functional block diagram for the power supply adaptor for improving POS cash register system stability of the utility model；
Fig. 2 is the circuit diagram of the utility model input filter circuit and rectification circuit；
Fig. 3 for the utility model transformer, pwm control circuit, power switch circuit, flow equalizing circuit, output filter circuit,
The circuit diagram of feedback circuit and indicating circuit.
Specific embodiment
With reference to Fig. 1, a kind of power supply adaptor for improving POS cash register system stability, including input filter circuit, rectification
Circuit, transformer, pwm control circuit and power switch circuit, the output terminal of the input filter circuit are connected to rectification circuit
Input terminal, the output terminal of the rectification circuit is defeated with the first of the first input end of pwm control circuit and transformer respectively
Entering end connection, the output terminal of the pwm control circuit is connected to the second input terminal of transformer by power switch circuit,
The power end of the pwm control circuit is connected to the 3rd input terminal of transformer, and the output terminal of the rectification circuit is also grounded
GND。
The power supply adaptor of the present embodiment is Switching Power Supply, and input filter circuit connects 380V AC powers, through input filter
300V direct currents are obtained after circuit filtering and rectifier circuit rectifies, then are exported after transformer transformation to POS cash registers as power supply
It uses.Pwm control circuit and power switch circuit are the common module of switching power circuit, for providing switching signal, with into
Row copped wave shaping.It remains to work normally or steadily transmit data, the present embodiment to ensure POS cash registers in no ground line
In a manner that rectification circuit output end is grounded so that the POS cash registers for accessing power supply adaptor are remained in no ground line
Normal work steadily carries out data transmission, and improves the stability of POS industry devices data transmission when not being grounded.
With reference to Fig. 1, preferred embodiment is further used as, further includes flow equalizing circuit, output filter circuit and feedback electricity
Road, the input terminal of the flow equalizing circuit and the output terminal of transformer connect, and the output terminal of the flow equalizing circuit is filtered respectively with output
The input terminal of wave circuit is connected with the first input end of feedback circuit, the output terminal of the output filter circuit also with feedback circuit
The connection of the second input terminal, the second input terminal of the output terminal of the feedback circuit and pwm control circuit connects.
In the present embodiment, flow equalizing circuit is used to flow the output current of transformer.Output filter circuit, for into
Row output filtering, obtains the power supply signal needed for POS cash registers.Feedback circuit, for providing output feedback for pwm control circuit
Signal.
Preferably, as shown in figure 3, the flow equalizing circuit can be by first resistor R10-11, the first capacitance C7, the second capacitance
C4, the first diode D4 and the second diode D5 compositions.As shown in figure 3, output filter circuit can be by second resistance R17, the 3rd
Capacitance C5 and the 4th capacitance C6 compositions.
With reference to Fig. 1, preferred embodiment is further used as, the feedback circuit includes regulator circuit and photoelectric coupling
Device, the output terminal of the output filter circuit pass sequentially through regulator circuit and photoelectrical coupler and then are connected to pwm control circuit
The second input terminal, the input terminal of the photoelectrical coupler is additionally coupled to the output terminal of flow equalizing circuit.
Preferably, as shown in figure 3, the regulator circuit can be made of voltage-stabiliser tube U3 and its peripheral circuit, and photoelectricity coupling
PC817C photoelectrical couplers can be used to realize in clutch U2.The TL431 chips that Texas Instruments can be used in voltage-stabiliser tube U3 come in fact
It is existing.
With reference to Fig. 2, preferred embodiment is further used as, the input filter circuit includes fuse F1, temperature-sensitive electricity
Start to exchange fire line L, the fuse F1 for one end of resistance RT, the first common mode inductance LF1 and the second common mode inductance LF2, the fuse F1
The other end first input end of the first common mode inductance LF1, first common mode inductance are connected to by thermistor RT
The second input terminal connecting zero line N of LF1, the first output terminal of the first common mode inductance LF1 and the first of the second common mode inductance LF2
Input terminal connects, and the second output terminal of the first common mode inductance LF1 is connected with the second input terminal of the second common mode inductance LF2,
The first output terminal of the second common mode inductance LF2 and the first input end of rectification circuit connect, the second common mode inductance LF2
Second output terminal and rectification circuit the second input terminal connect.
The effect of the common mode inductance is EMI filtering, and common mode inductance is substantially a bidirectional filter：On the one hand to filter
Except suppression common mode electromagnetic interference on signal wire, on the other hand inhibition does not send out electromagnetic interference in itself again, avoids influencing same electricity
The normal work of other electronic equipments under magnetic environment.Preferably, the second common mode inductance LF2 is common mode magnetic field inductance coil.
Preferably, the thermistor RT is NTC thermistor, and when circuit incoming transport power supply, electric current will increase moment
Greatly, and the characteristic of NTC thermistor when being low temperature resistance value it is high, therefore subsequently can continue work in circuit to avoid current surge
When making, the rise of NTC thermistor temperature no longer generates inhibitory action to the electric current in circuit.
With reference to Fig. 2, preferred embodiment is further used as, the rectification circuit includes the first rectifier diode D1A, the
Two rectifier diode D1B, the 3rd rectifier diode D1C and the 4th rectifier diode D1D, the first rectifier diode D1A's
First output terminal of the cathode of anode and the second rectifier diode D1B with the second common mode inductance LF2 is connected, the 3rd rectification
Second output terminal of the anode of the cathode of diode D1C and the 4th rectifier diode D1D with the second common mode inductance LF2 is connected,
The cathode of the first rectifier diode D1A and the cathode of the 4th rectifier diode D1D connect with the first input end of transformer
It connects, the anode of the second rectifier diode D1B and the anode of the 3rd rectifier diode D1C are grounded GND.
With reference to Fig. 2 and Fig. 3, preferred embodiment is further used as, the transformer T1 includes the first primary coil, the
Two primary coils and secondary coil, the first end of first primary coil are connected with the cathode of the first rectifier diode D1A, institute
It states the second end of the first primary coil and the output terminal of power switch circuit connects, one end of second primary coil and PWM
Control circuit first input end connection, second primary coil the other end ground connection GND, one end of the secondary coil with
The input terminal connection of flow equalizing circuit, the other end of the secondary coil with being connected to lightning protection LGND.
Preferably, as shown in figure 3, being also associated with safety capacitance Y1 between the first primary coil and secondary coil, more pacify
Entirely.
With reference to Fig. 3, preferred embodiment is further used as, further includes sustained diode 3, the sustained diode 3
Anode be connected with the second end of the first primary coil, the cathode of the sustained diode 3 is connected to the of the first primary coil
One end.
Preferably, the sustained diode 3 is connected in reverse parallel in the both ends of the first primary coil, to dash forward in voltage or electric current
During change, shield to other elements (such as power switch circuit) in circuit.
With reference to Fig. 2 and Fig. 3, preferred embodiment is further used as, the pwm control circuit includes pwm chip
U1, the power switch circuit is including N-channel enhancement mode FET Q1, the feedback end FB of the pwm chip U1 and instead
The output terminal connection of current feed circuit, the power end VCC of the pwm chip U1 cathode with the first rectifier diode D1A respectively
And second primary coil one end connection, the output terminal GATE of the pwm chip U1 is connected to the enhanced field effect of N-channel
Should pipe Q1 grid, the source electrode of the Enable Pin SENSE and N-channel enhancement mode FET Q1 of the pwm chip U1 connects
Ground GND, the drain electrode of the N-channel enhancement mode FET Q1 are connected to the second end of the first primary coil.
In the present embodiment, the first input end and power end of pwm control circuit are combined into one, that is to say, that PWM is controlled
The first input end and power end of circuit are the power end VCC of pwm chip U1, as shown in Figure 3.Preferably, PWM is controlled
Logical good science and technology LD7515 chips can be used to realize in the pwm chip U1 of circuit processed.
With reference to Fig. 3, preferred embodiment is further used as, in the output terminal and output filter circuit of the flow equalizing circuit
Input terminal between be also associated with the first inductance L1.
With reference to Fig. 3, preferred embodiment is further used as, further includes indicating circuit, the indicating circuit includes instruction
Resistance R18 and indicator light D8, the output terminal of the output filter circuit is by indicating that resistance R18 is connected to the input of indicator light D8
End, the output terminal of the indicator light D8 with being connected to lightning protection LGND.
In the present embodiment, whether the output terminal that indicating circuit is used to indicate output filter circuit has voltage, if so, indicator light
D8 can be bright；Conversely, indicator light D8 can extinguish.
Generally speaking, it is the stability problem of solution POS industry devices data transmission in no ground line, the utility model
A kind of power supply adaptor for improving POS cash register system stability is proposed, by by the side of the output head grounding of rectification circuit
Formula causes the POS cash registers for accessing power supply adaptor to remain to work normally or steadily carry out data transmission in no ground line,
The antijamming capability and stability of POS cash register systems are improved, it is relatively reliable.
The above are implementing to be illustrated to the preferable of the utility model, but the utility model is not limited to the reality
Example is applied, those skilled in the art can also make a variety of equivalent changes on the premise of without prejudice to the utility model spirit
Shape or replacement, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (10)
1. a kind of power supply adaptor for improving POS cash register system stability, it is characterised in that：Including input filter circuit, whole
Current circuit, transformer, pwm control circuit and power switch circuit, the output terminal of the input filter circuit are connected to rectified current
The input terminal on road, the output terminal of the rectification circuit respectively with the first input end of pwm control circuit and transformer first
Input terminal connects, and the output terminal of the pwm control circuit is connected to the second input of transformer by power switch circuit
End, the power end of the pwm control circuit are connected to the 3rd input terminal of transformer, and the output terminal of the rectification circuit also connects
Ground.
2. a kind of power supply adaptor for improving POS cash register system stability according to claim 1, it is characterised in that：
Flow equalizing circuit, output filter circuit and feedback circuit are further included, the input terminal of the flow equalizing circuit and the output terminal of transformer connect
It connecing, the first input end of the output terminal of the flow equalizing circuit respectively with the input terminal of output filter circuit and feedback circuit is connected,
The output terminal of the output filter circuit is also connected with the second input terminal of feedback circuit, the output terminal of the feedback circuit with
The second input terminal connection of pwm control circuit.
3. a kind of power supply adaptor for improving POS cash register system stability according to claim 2, it is characterised in that：
The feedback circuit includes regulator circuit and photoelectrical coupler, and the output terminal of the output filter circuit passes sequentially through regulator circuit
With photoelectrical coupler and then the second input terminal of pwm control circuit is connected to, the input terminal of the photoelectrical coupler is additionally coupled to
The output terminal of flow equalizing circuit.
4. a kind of power supply adaptor for improving POS cash register system stability according to claim 3, it is characterised in that：
The input filter circuit include fuse, thermistor, the first common mode inductance and the second common mode inductance, the one of the fuse
Firewire is terminated, the other end of the fuse is connected to the first input end of the first common mode inductance by thermistor, institute
State the second input terminal connecting zero line of the first common mode inductance, the first output terminal of first common mode inductance and the second common mode inductance
First input end connects, and the second output terminal of first common mode inductance is connected with the second input terminal of the second common mode inductance, institute
The first input end of the first output terminal and rectification circuit of stating the second common mode inductance connects, and the second of second common mode inductance is defeated
Second input terminal of outlet and rectification circuit connects.
5. a kind of power supply adaptor for improving POS cash register system stability according to claim 4, it is characterised in that：
The rectification circuit includes the first rectifier diode, the second rectifier diode, the 3rd rectifier diode and the 4th rectifier diode,
The anode of first rectifier diode and the cathode of the second rectifier diode connect with the first output terminal of the second common mode inductance
It connects, the second output terminal of the cathode of the 3rd rectifier diode and the anode of the 4th rectifier diode with the second common mode inductance
Connection, the cathode of first rectifier diode and the cathode of the 4th rectifier diode connect with the first input end of transformer
It connects, the anode of second rectifier diode and the anode of the 3rd rectifier diode are grounded.
6. a kind of power supply adaptor for improving POS cash register system stability according to claim 5, it is characterised in that：
The transformer includes the first primary coil, the second primary coil and secondary coil, the first end point of first primary coil
One end not with the cathode of the first rectifier diode and the second primary coil is connected, the second end of first primary coil with
The output terminal connection of power switch circuit, one end of second primary coil and the first input end of pwm control circuit connect,
The other end ground connection of second primary coil, one end of the secondary coil and the input terminal of flow equalizing circuit connect, the pair
The other end of sideline circle is with being connected to lightning protection.
7. a kind of power supply adaptor for improving POS cash register system stability according to claim 6, it is characterised in that：
Fly-wheel diode is further included, the anode of the fly-wheel diode is connected with the second end of the first primary coil, two pole of afterflow
The cathode of pipe is connected to the first end of the first primary coil.
8. a kind of power supply adaptor for improving POS cash register system stability according to claim 6, it is characterised in that：
The pwm control circuit includes pwm chip, and the power switch circuit includes N-channel enhancement mode FET, described
The feedback end of pwm chip and the output terminal of feedback circuit connect, and the power end of the pwm chip is whole with first respectively
One end connection of the cathode and the second primary coil of diode is flowed, the output terminal of the pwm chip is connected to N-channel increasing
The grid of strong type field-effect tube, the Enable Pin of the pwm chip and the source grounding of N-channel enhancement mode FET,
The drain electrode of the N-channel enhancement mode FET is connected to the second end of the first primary coil.
It is 9. special according to a kind of power supply adaptor for improving POS cash register system stability of claim 2-8 any one of them
Sign is：The first inductance is also associated between the output terminal of the flow equalizing circuit and the input terminal of output filter circuit.
10. according to claim 2-8 any one of them it is a kind of improve POS cash register system stability power supply adaptor,
It is characterized in that：Further include indicating circuit, the indicating circuit includes instruction resistance and indicator light, the output filter circuit it is defeated
Outlet is by indicating that resistance is connected to the input terminal of indicator light, and the output terminal of the indicator light is with being connected to lightning protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176535.XU CN207382208U (en) | 2017-09-13 | 2017-09-13 | A kind of power supply adaptor for improving POS cash register system stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721176535.XU CN207382208U (en) | 2017-09-13 | 2017-09-13 | A kind of power supply adaptor for improving POS cash register system stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207382208U true CN207382208U (en) | 2018-05-18 |
Family
ID=62339893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721176535.XU Active CN207382208U (en) | 2017-09-13 | 2017-09-13 | A kind of power supply adaptor for improving POS cash register system stability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207382208U (en) |
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2017
- 2017-09-13 CN CN201721176535.XU patent/CN207382208U/en active Active
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