CN205986802U - Adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up - Google Patents
Adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up Download PDFInfo
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- CN205986802U CN205986802U CN201620807566.XU CN201620807566U CN205986802U CN 205986802 U CN205986802 U CN 205986802U CN 201620807566 U CN201620807566 U CN 201620807566U CN 205986802 U CN205986802 U CN 205986802U
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Abstract
The utility model discloses an adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up is provided with input ui, load RL, rectifier circuit and electronic switching circuit, input ui's one end is connected with the first end of rectifier circuit's input through load RL, and input ui's the other end is connected with the second end of rectifier circuit's input, the setting is kept apart to the earthing terminal of control circuit's input and output filter circuit's earthing terminal, still be provided with indicator lamp circuit on rectifier circuit's the output, be provided with the resistance R1 and the LED1 of mutual series connection in the indicator lamp circuit, indicator lamp circuit's earthing terminal connects with the earthing terminal of control circuit's input altogether, utilizing electric capacity as output filter circuit, playing good filtering effect when reducing the design and using the cost, be provided with indicator lamp circuit, in situ observation exchanges the whether normal operating of working state of a circuit behind the rectified output to inspection for the front and back level forms the detection node.
Description
Technical field
This utility model is related to electronic circuit technology field, specifically, is using capacitor filtering output and front stage ground
The electronic switching circuit of isolation setting.
Background technology
Electrical switch refers to realize the running unit of connecting and disconnecting of the circuit using electronic circuit and power electronic devices, at least wraps
Include a controlled electric drive device, such as IGCT, transistor, field effect transistor, controllable silicon, relay etc..But make actual
With during, electrical switch is primarily referred to as the switch on wall such as soft-touch control, inductive switch, audio-switch, wireless switching.
555 intervalometers are the medium-scale integration devices that a kind of analog- and digital- function phase combines.General with ambipolar（TTL）
What technique made is referred to as 555, uses CMOS (Complementary Metal Oxide Semiconductor)（CMOS ）What technique made is referred to as 7555, in addition to single intervalometer, also
There is corresponding dual timer 556/7556.The supply voltage wide ranges of 555 intervalometers, can work in 4.5V ~ 16V, and 7555 can be
3 ~ 18V works, and output driving current is about 200mA, thus its output can be compatible with TTL, CMOS or analog circuit level.
Prior art is when carrying out electronic switching circuit design, often public by the earth terminal of input circuit and output circuit
With thus causing front stage to influence each other, switching situations such as susceptiveness is deteriorated and occurring, even electric shock accidentss occurring when serious
Occur.
Utility model content
The purpose of this utility model be to provide using capacitor filtering output and front stage isolate the electrical switch of setting
Circuit, by the use of electric capacity as output filter circuit, can play good filter effect while reducing design and application cost,
And it is provided with indicator light circuit, whether normally can be run with the circuit working state after the output of Real Time Observation AC rectification, and
Inspection for front stage forms detection node.
This utility model is achieved through the following technical solutions：Using capacitor filtering output and front stage isolate the electricity of setting
Sub- on-off circuit, is provided with input Ui, load RL, rectification circuit and electronic switching circuit, and one end of described input Ui leads to
Overload RL is connected with the first end of the input of rectification circuit, the other end of input Ui and the input of rectification circuit
Second end is connected；It is provided with control circuit and output filter circuit, the output of described rectification circuit in electronic switching circuit
End is connected with the input of control circuit, and the outfan of control circuit is connected with output filter circuit, output filter circuit
Inside it is provided with capacitor C2, capacitor C2 is connected in parallel on the outfan of control circuit；The earth terminal of the input of control circuit and
The earth terminal isolation setting of output filter circuit；The outfan of described rectification circuit is additionally provided with indicator light circuit, described
It is provided with resistance R1 and LED1 being serially connected, and the input of the earth terminal of indicator light circuit and control circuit in indicator light circuit
The earth terminal at end connects altogether.
Further is preferably to realize this utility model, especially adopts following setting structures：In described control circuit
It is provided with integrated chip IC1, electric capacity C1, transistor Q2, collector bias resistance R3, pull-up resistor R4, pull down resistor W1, integrated
3 feet of chip IC 1,8 feet and 1 foot are connected with the outfan of rectification circuit；The colelctor electrode of transistor Q2 and integrated chip IC1
2 feet and 6 feet connect altogether, and the colelctor electrode of transistor Q2 is connected on second end of collector bias resistance R3, collector bias electricity
The first end of resistance R3 is connected with the first end of 8 feet, the first end of pull-up resistor R4 and capacitor C2 of integrated chip IC1 respectively
Connect, second end of pull-up resistor R4 is all connected with the base stage of transistor Q2 with the first end of pull down resistor W1, transistor Q2's
Emitter stage is all connected with second end of capacitor C2 with second end of pull down resistor W1, and second end of capacitor C2 is output filter
The earth terminal of wave circuit, 1 foot of integrated chip IC1 is the earth terminal of the input of control circuit.
Further is preferably to realize this utility model, especially adopts following setting structures：Set in described rectification circuit
Be equipped with rectifier bridge IC2, diode D1, resistance R1 and electronic switching tube Q1, one end of described input Ui pass through to load RL with whole
The first end of the input of stream bridge IC2 is connected, and the other end of input Ui is connected with the second end of the input of rectifier bridge IC2
Connect；The outfan of rectifier bridge IC2 is connected with the first end of resistance R1 and the emitter stage of electronic switching tube Q1 respectively, resistance R1's
Second end is connected on the colelctor electrode of electronic switching tube Q1, and the first end of resistance R1 passes through diode D1 and integrated chip IC1
8 feet be connected；The base stage of electronic switching tube Q1 is connected on 3 feet of integrated chip IC1, the emitter stage of electronic switching tube Q1 with
The earth terminal of the input of control circuit is connected.
Further is preferably to realize this utility model, especially adopts following setting structures：Described diode D1's is negative
Pole is connected on 8 feet of integrated chip IC1.
Further is preferably to realize this utility model, especially adopts following setting structures：Described pull down resistor W1 adopts
Use potentiometer.
Further is preferably to realize this utility model, especially adopts following setting structures：Described integrated chip IC1
4 feet and 8 feet connect altogether.
Further is preferably to realize this utility model, especially adopts following setting structures：Described integrated chip IC1 is adopted
Use NE555 intervalometer.
Further is preferably to realize this utility model, especially adopts following setting structures：One end of described resistance R1
It is connected with the first end of the input of rectification circuit, and the negative pole of LED1 is connected with the earth terminal of the input of control circuit.
Further is preferably to realize this utility model, especially adopts following setting structures：Described electronic switching tube Q1
All adopt NPN triode with transistor Q2.
Further is preferably to realize this utility model, especially adopts following setting structures：Described rectifier bridge IC2 adopts
The full-bridge rectification chip of paster mini bridge construction.
This utility model compared with prior art, has advantages below and beneficial effect：
This utility model, by the use of electric capacity as output filter circuit, can play good while reducing design and application cost
Good filter effect, and it is provided with indicator light circuit, with the circuit working state after the output of Real Time Observation AC rectification can be
No normal operation, and form detection node for the inspection of front stage.
The front stage of electronic switching circuit is isolated setting by this utility model, it is to avoid high ripple current affects rear class direct current
Output, it is to avoid the situation that when in front and back altogether, ripple coefficient of voltage is high occurs, and can effectively improve the stability of direct current output, make
The direct current supply obtaining whole circuit is more stable, and reduces ripple output, it is to avoid rear class power supply circuits are due to being affected by ripple
And cisco unity malfunction, further avoid reducing the service life of late-class circuit, handed over using electronic switching circuit simultaneously
The power supply break-make of stream end load controls, its accurately control performance, and it is more stable to enable to entirely to exchange end work, reduces control
The incidence rate of electrocution conditions that may be present during system operation.
Using the full-bridge rectification chip of paster mini bridge construction, rectifier bridge of the present utility model can ensure that electronic cutting is powered-down
While road serviceability, heat dispersion, electronic switching circuit is designed to more compact, thus room for promotion utilization rate.
This utility model adopts NE555 as integrated chip, its simple circuit structure, and cheap cost is so that whole
Electronic switching circuit has accuracy and the characteristic of low cost concurrently.
The pull down resistor of this utility model transistor Q2 base stage adopts potentiometer, can real-time regulation pull down resistor resistance,
Thus obtaining suitable base bias voltage.
Brief description
Fig. 1 is circuit theory diagrams of the present utility model.
Specific embodiment
With reference to embodiment, this utility model is described in further detail, but embodiment of the present utility model is not
It is limited to this.
Embodiment 1：
Using capacitor filtering output and front stage isolate the electronic switching circuit of setting, by the use of electric capacity as output filtering
Circuit, can play good filter effect while reducing design and application cost, and be provided with indicator light circuit, permissible
Whether the circuit working state after the output of Real Time Observation AC rectification normally runs, and forms detection section for the inspection of front stage
Point, as shown in figure 1, be specifically arranged to following structures：It is provided with input Ui, load RL, rectification circuit and electronic switching circuit,
One end of described input Ui is connected with the first end of the input of rectification circuit by loading RL, the other end of input Ui
It is connected with the second end of the input of rectification circuit；It is provided with control circuit and output filtered electrical in electronic switching circuit
Road, the outfan of described rectification circuit is connected with the input of control circuit, the outfan of control circuit with output filtered electrical
Road is connected, and is provided with capacitor C2 in output filter circuit, and capacitor C2 is connected in parallel on the outfan of control circuit；Control electricity
The earth terminal isolation setting of the earth terminal of the input on road and output filter circuit；The outfan of described rectification circuit also sets
It is equipped with indicator light circuit, in described indicator light circuit, be provided with resistance R1 and LED1 being serially connected, and the connecing of indicator light circuit
Ground terminal is connect altogether with the earth terminal of the input of control circuit, and described electric capacity C2 adopts electrochemical capacitor, and the negative pole of electric capacity C2 is defeated
Go out the earth terminal of filter circuit.
When design uses, the power supply with ripple voltage after rectifier bridge IC2 rectification can be through dropping resistor R1
Powering for LED1, thus lighting LED1, and simultaneously, also can judge that by judging the light on and off of LED etc. the fault of whole circuit is
Occur in rectification section or control circuit section.
Embodiment 2：
The present embodiment is to optimize further on the basis of above-described embodiment, and further is preferably to realize this practicality newly
Type, as shown in figure 1, especially adopt following setting structures：It is provided with integrated chip IC1, electric capacity C1, crystalline substance in described control circuit
Body pipe Q2, collector bias resistance R3, pull-up resistor R4, pull down resistor W1,3 feet of integrated chip IC1,8 feet and 1 foot and rectification
The outfan of circuit is connected；The colelctor electrode of transistor Q2 is connect altogether with 2 feet of integrated chip IC1 and 6 feet, and the collection of transistor Q2
Electrode is connected on second end of collector bias resistance R3, the first end of collector bias resistance R3 respectively with integrated chip
8 feet of IC1, the first end of pull-up resistor R4 are connected with the first end of capacitor C2, second end of pull-up resistor R4 and drop-down
The first end of resistance W1 is all connected with the base stage of transistor Q2, and second end of the emitter stage of transistor Q2 and pull down resistor W1 is all
It is connected with second end of capacitor C2, second end of capacitor C2 is the earth terminal of output filter circuit, integrated chip IC1
1 foot is the earth terminal of the input of control circuit.
Embodiment 3：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, as shown in figure 1, especially adopting following setting structures：Be provided with described rectification circuit rectifier bridge IC2, diode D1,
One end of resistance R1 and electronic switching tube Q1, described input Ui is passed through to load the first end of the input of RL and rectifier bridge IC2
It is connected, the other end of input Ui is connected with the second end of the input of rectifier bridge IC2；The outfan of rectifier bridge IC2 divides
It is not connected with the first end of resistance R1 and the emitter stage of electronic switching tube Q1, second end of resistance R1 is connected to electronic switching tube
On the colelctor electrode of Q1, and the first end of resistance R1 is connected with 8 feet of integrated chip IC1 by diode D1；Electronic switching tube
The base stage of Q1 is connected on 3 feet of integrated chip IC1, the ground connection of the emitter stage of electronic switching tube Q1 and the input of control circuit
End is connected.
Embodiment 4：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, as shown in figure 1, especially adopting following setting structures：The negative pole of described diode D1 is connected to the 8 of integrated chip IC1
On foot.
Embodiment 5：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, as shown in figure 1, especially adopting following setting structures：Described pull down resistor W1 adopts potentiometer.
Embodiment 6：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, especially adopt following setting structures：4 feet of described integrated chip IC1 and 8 feet connect altogether.
Embodiment 7：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, especially adopt following setting structures：Described integrated chip IC1 adopts NE555 intervalometer.
Embodiment 8：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, as shown in figure 1, especially adopting following setting structures：The of one end of described resistance R1 and the input of rectification circuit
One end is connected, and the negative pole of LED1 is connected with the earth terminal of the input of control circuit.
Embodiment 9：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, especially adopt following setting structures：Described electronic switching tube Q1 and transistor Q2 all adopts NPN triode.
Embodiment 10：
The present embodiment is to optimize further on the basis of any of the above-described embodiment, and further is preferably to realize this reality
With new, especially adopt following setting structures：Described rectifier bridge IC2 adopts the full-bridge rectification chip of paster mini bridge construction.
Alternating current after transformation is introduced in rectification circuit IC2 carry out all wave rectification by described input Ui, and energy
Electric energy needed for enough RL offers for load, the power supply break-make that electronic switching circuit is used for realizing load RL controls and can export rear class
DC voltage needed for circuit, provides stable and ripple-free unidirectional current for late-class circuit.
The pull down resistor of transistor Q2 base stage adopts potentiometer, can real-time regulation pull down resistor resistance, thus being closed
Suitable base bias voltage.
Each pin function of NE555 intervalometer is as follows：
1 foot：External power supply negative terminal VSS or ground connection, are generally grounded.
2 feet：Low triggering end TR.
3 feet：Output end vo.
4 feet：It is direct clear terminal.When this terminates low level, then time base circuit does not work, no matter now what TR, TH be in
Level, time base circuit is output as " 0 ", and the used time should not connect high level at this end.
5 feet：VC is control voltage end.The reference voltage of internal two comparators if this end external voltage, can be changed, when
This end not used time, this end should be sealed in a 0.01 μ F capacity earth, in case introducing interference.
6 feet：High-triggering end TH.
7 feet：Discharge end.This end is connected with electric discharge pipe collector, is used as the electric discharge of electric capacity during intervalometer.
8 feet：External power supply VCC, the scope of bipolar time-base circuits VCC is 4.5 ~ 16V, CMOS-type time base circuit VCC
Scope be 3 ~ 18V.Typically use 5V.
Output filter circuit adopts L-type RC filter circuit, effectively can filter the ripple voltage on output direct current, from
And be that late-class circuit provides reliable and stable DC voltage.
Rectification circuit using the full-bridge rectification chip of paster mini bridge construction can ensure that electronic switching circuit serviceability,
While heat dispersion, electronic switching circuit is designed to more compact, thus room for promotion utilization rate.
NPN triode is used as electronic switching tube Q1, by NE555 time-base integrated circuit as control circuit main core
Piece, wherein transistor Q2 composition is higher when test side output voltage, and the output DC voltage of transistor Q2 colelctor electrode is lower
Phase inverter.
When output voltage is very low, the base stage no current due to transistor Q2 flows into, then be in cut-off state, whole through prime
After current circuit rectification, electric current is to energy storage filter capacitor（Electric capacity C2）Charge, when charge during, the voltage at electric capacity C2 two ends
Gradually rise, during voltage starts to raise, the base potential of transistor Q2 also constantly rises, in the base of transistor Q2
When the voltage of pole is less than the collector voltage of transistor Q2, transistor Q2 ends, and now 2,6 feet of NE555 are in high level,
The 3 foot output voltages of NE555 are then low level；When the voltage drop on pull-up resistor R4 increases, the electricity of transistor Q2 colelctor electrode
Drops, when it drops to the triggering level of NE555, the trigger within NE555 is set to high level, when 3 feet are high electricity
At ordinary times, electronic switching tube Q1, due to the high level of control end, makes electronic switching tube Q1 in the conduction state, i.e. switch closure, then
Load RL is switched on work.Because the 7th foot of 555 integrated circuits is the terminal having corresponding function with 3 feet, in this triggers circuit
Also input Ui can be used to introduce alternating voltage and provide rectification circuit IC2 to carry out rectification process as lead-out terminal, be contained
The unidirectional current of ripple voltage.
The above, be only preferred embodiment of the present utility model, and not this utility model is done with any pro forma limit
System, every any simple modification above example made according to technical spirit of the present utility model, equivalent variations, each fall within
Within protection domain of the present utility model.
Claims (10)
1. adopt capacitor filtering export and front stage ground isolation setting electronic switching circuit it is characterised in that：It is provided with input
End Ui, load RL, rectification circuit and electronic switching circuit, the defeated of RL and rectification circuit is passed through to load in one end of described input Ui
The first end entering end is connected, and the other end of input Ui is connected with the second end of the input of rectification circuit；In electronic cutting
Close in circuit and be provided with control circuit and output filter circuit, the input phase of the outfan of described rectification circuit and control circuit
Connect, the outfan of control circuit is connected with output filter circuit, is provided with capacitor C2, capacitor in output filter circuit
C2 is connected in parallel on the outfan of control circuit；The earth terminal isolation of the earth terminal of the input of control circuit and output filter circuit
Setting；The outfan of described rectification circuit is additionally provided with indicator light circuit, in described indicator light circuit, is provided with mutual string
Resistance R1 and LED1 of connection, and the earth terminal of indicator light circuit connect altogether with the earth terminal of the input of control circuit.
2. the electronic switching circuit of employing capacitor filtering output according to claim 1 and the isolation setting of front stage ground, its
It is characterised by：Be provided with described control circuit integrated chip IC1, electric capacity C1, transistor Q2, collector bias resistance R3,
Pull-up resistor R4, pull down resistor W1,3 feet of integrated chip IC1,8 feet and 1 foot are connected with the outfan of rectification circuit；Crystal
The colelctor electrode of pipe Q2 is connect altogether with 2 feet of integrated chip IC1 and 6 feet, and the colelctor electrode of transistor Q2 is connected to collector bias electricity
On second end of resistance R3, the first end of collector bias resistance R3 respectively with 8 feet of integrated chip IC1, pull-up resistor R4 the
One end is connected with the first end of capacitor C2, second end of pull-up resistor R4 and the first end of pull down resistor W1 all with transistor
The base stage of Q2 is connected, and the emitter stage of transistor Q2 is all connected with second end of capacitor C2 with second end of pull down resistor W1
Connect, second end of capacitor C2 is the earth terminal of output filter circuit, 1 foot of integrated chip IC1 is the input of control circuit
Earth terminal.
3. the electronic switching circuit of employing capacitor filtering output according to claim 2 and the isolation setting of front stage ground, its
It is characterised by：It is provided with rectifier bridge IC2, diode D1, resistance R1 and electronic switching tube Q1, described input in described rectification circuit
One end of end Ui is passed through load RL and is connected with the first end of the input of rectifier bridge IC2, the other end of input Ui and rectification
Second end of the input of bridge IC2 is connected；The outfan of rectifier bridge IC2 first end and the electronic switching tube with resistance R1 respectively
The emitter stage of Q1 is connected, and second end of resistance R1 is connected on the colelctor electrode of electronic switching tube Q1, and the first end of resistance R1
It is connected with 8 feet of integrated chip IC1 by diode D1；The base stage of electronic switching tube Q1 is connected to 3 feet of integrated chip IC1
On, the emitter stage of electronic switching tube Q1 is connected with the earth terminal of the input of control circuit.
4. the electronic switching circuit of employing capacitor filtering output according to claim 3 and the isolation setting of front stage ground, its
It is characterised by：The negative pole of described diode D1 is connected on 8 feet of integrated chip IC1.
5. according to Claims 2 or 3 or 4 employing capacitor filtering output and front stage isolate setting electronic cutting powered-down
Road it is characterised in that：Described pull down resistor W1 adopts potentiometer.
6. according to Claims 2 or 3 or 4 employing capacitor filtering output and front stage isolate setting electronic cutting powered-down
Road it is characterised in that：4 feet of described integrated chip IC1 and 8 feet connect altogether.
7. according to Claims 2 or 3 or 4 employing capacitor filtering output and front stage isolate setting electronic cutting powered-down
Road it is characterised in that：Described integrated chip IC1 adopts NE555 intervalometer.
8. isolate the electronic switching circuit of setting to the employing capacitor filtering output according to claim 3 or 4 and front stage,
It is characterized in that：One end of described resistance R1 is connected with the first end of the input of rectification circuit, and the negative pole of LED1 and control
The earth terminal of the input of circuit processed connects.
9. isolate the electronic switching circuit of setting to the employing capacitor filtering output according to claim 3 or 4 and front stage,
It is characterized in that：Described electronic switching tube Q1 and transistor Q2 all adopts NPN triode.
10. according to claim 3 or 4 employing capacitor filtering output and front stage isolate setting electronic cutting powered-down
Road it is characterised in that：Described rectifier bridge IC2 adopts the full-bridge rectification chip of paster mini bridge construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620807566.XU CN205986802U (en) | 2016-07-29 | 2016-07-29 | Adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620807566.XU CN205986802U (en) | 2016-07-29 | 2016-07-29 | Adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986802U true CN205986802U (en) | 2017-02-22 |
Family
ID=58027200
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620807566.XU Expired - Fee Related CN205986802U (en) | 2016-07-29 | 2016-07-29 | Adopt capacitor filter output and front and back level ground to keep apart electronic switching circuit who sets up |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986802U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947592A (en) * | 2017-12-19 | 2018-04-20 | 西安电子科技大学 | A kind of full-bridge type Switching Power Supply ripple factor Forecasting Methodology based on road coupling |
-
2016
- 2016-07-29 CN CN201620807566.XU patent/CN205986802U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947592A (en) * | 2017-12-19 | 2018-04-20 | 西安电子科技大学 | A kind of full-bridge type Switching Power Supply ripple factor Forecasting Methodology based on road coupling |
| CN107947592B (en) * | 2017-12-19 | 2019-06-18 | 西安电子科技大学 | A kind of full-bridge type Switching Power Supply ripple factor prediction technique based on road coupling |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180619 Address after: 510000 1 Zhuji Road, Tianhe District, Guangzhou, Guangdong 6015 (for office use only) Patentee after: Guangdong one mechanical and electrical equipment Engineering Co., Ltd. Address before: 610000 Sichuan Chengdu high tech Zone, Tianfu Road North Section 1700, 9 1 units, 6 level 612. Patentee before: Chengdu Liwei Technology Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20200729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |