CN104184314B - A kind of energy-storage travelling wave tube power-off automatic discharge circuit and its charging method - Google Patents
A kind of energy-storage travelling wave tube power-off automatic discharge circuit and its charging method Download PDFInfo
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- CN104184314B CN104184314B CN201410452524.4A CN201410452524A CN104184314B CN 104184314 B CN104184314 B CN 104184314B CN 201410452524 A CN201410452524 A CN 201410452524A CN 104184314 B CN104184314 B CN 104184314B
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Abstract
Present invention is disclosed a kind of energy-storage travelling wave tube power-off automatic discharge circuit and its charging method, the automatic discharge circuit includes：AC dump detecting unit, control signal generating unit and discharge cell；The AC dump detecting unit is coupled in the two ends of energy-storage travelling wave tube by two diodes and resistance, to judge whether alternating current disconnects；The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal generating unit obtains the electrically disconnected signal of exchange from AC dump detecting unit, controls discharge cell to be discharged for energy-storage travelling wave tube.Energy-storage travelling wave tube proposed by the present invention powers off automatic discharge circuit, both can guarantee that the electric discharge safety of the energy-storage travelling wave tubes such as X electric capacity, and the power wastage that can be reduced or even avoid energy-storage travelling wave tube discharge resistance from bringing.
Description
Technical field
The invention belongs to electronic circuit technology field, it is related to a kind of automatic discharge circuit, more particularly to a kind of energy-storage travelling wave tube
Power off automatic discharge circuit；Meanwhile, the invention further relates to a kind of energy-storage travelling wave tube power-off automatic discharging method.
Background technology
During the use of household electrical appliance, X electric capacity is usually located between the input terminal of power supply, is made an uproar for filtering EMI
Sound.Due to they can after alternating current power-off long-time storage high voltage electric energy, therefore easily constitute security threat.
The necessary parallel discharge resistance of safety standard regulation X electric capacity, to discharge X electric capacity.But discharge resistance meeting
Constant power attenuation is produced after exchange is electrically connected, by taking discharge resistance 2M Ω as an example, when AC-input voltage is 250V, is put
The lasting power consumption that electric resistive band comes is 35mV, and this is the key factor for causing unloaded and standby input power consumption.
In view of this, nowadays in the urgent need to designing a kind of new, for X electric capacity discharge mode, to overcome existing side
The drawbacks described above of formula.
The content of the invention
The technical problems to be solved by the invention are：A kind of energy-storage travelling wave tube power-off automatic discharge circuit is provided, both be can guarantee that
The electric discharge safety of energy-storage travelling wave tube, and the power wastage that can be reduced or even avoid energy-storage travelling wave tube discharge resistance from bringing.
In addition, the present invention also provides a kind of energy-storage travelling wave tube power-off automatic discharging method, the electric discharge of energy-storage travelling wave tube both can guarantee that
Safety, and the power wastage that can be reduced or even avoid energy-storage travelling wave tube discharge resistance from bringing.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of energy-storage travelling wave tube powers off automatic discharge circuit, and the automatic discharge circuit includes：AC dump detecting unit, control
Signal generating unit and discharge cell processed；The energy-storage travelling wave tube is X electric capacity；
The AC dump detecting unit is coupled in the two ends of X electric capacity by two diodes and resistance, to judge to hand over
Whether stream electricity disconnects；The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal
Generating unit obtains the electrically disconnected signal of exchange from AC dump detecting unit, then it is X capacitor discharge to control discharge cell；
The exchange detecting unit includes two diodes, resistance, two phase inverters, an XOR gates；Above-mentioned two two
Pole pipe and resistance are coupled in the two ends of X electric capacity；The AC signal at X electric capacity two ends is defeated after two diodes and a resistance
The AC signal for entering to exchange detecting unit is half wave rectified signal；Described two phase inverters are the different phase inverter of two threshold values,
Its threshold value is respectively V1 and V2, and wherein V1 is more than V2；Input sine wave is converted into two square wave letters using two phase inverters
Number, because the two square-wave signals produce for same sine wave, so it has identical phase and cycle, only rise
There is different the time that edge and trailing edge occur；Two square-wave signals obtain the cycle for sine wave period by XOR gate processing
Pulse signal；The characteristics of this pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply
When, pulse signal occurs, and with alternating current same period, its pulse width controls by the threshold value of two phase inverters；Thus, obtain
It whether is powered to detecting alternating current, and exports corresponding signal；
The control signal generating unit be used to according to exchange detecting unit provide pulse signal or low level signal come
Control signal is provided for discharge switch；Wherein, when alternating current is powered, exchange detecting unit provides pulse signal, works as alternating current
Low level signal is provided during power-off；
The control signal generating unit includes the first current source, the second current source；First current source is single for exchange detecting
The output signal of member is controlled, and when output signal is high level, the first current source is opened, and is charged to electric capacity；Second current source
For constant-current source, its control signal is constant high level；In two above current source, the current value of the first current source is much larger than second
The current value of current source；The alternating current continued power when, electric capacity charging end will be charged to high level；When electric capacity is filled
To after high level, as long as the pulse signal of exchange detecting unit output does not stop, it is just always maintained at high level state；But when friendship
When flowing electrically disconnected, the pulse control signal of the first current source is changed into low level, current source cut-off；Now only have the second current source to hold
Continuous electric discharge, until capacitance charge is all discharged；The output signal of the electric capacity is passed through by Schmidt trigger and XOR gate group
Into processing module, produce discharge switch control signal, the signal be AC-powered disconnection after occur one fixed width height
Level pulse signal；
The discharge cell includes MOS switch and its protection circuit, under the control of switch controlling signal, when alternating current is disconnected
When opening, control of discharge is carried out to X electric capacity.
A kind of energy-storage travelling wave tube powers off automatic discharge circuit, and the automatic discharge circuit includes：AC dump detecting unit, control
Signal generating unit and discharge cell processed；
The AC dump detecting unit is coupled in the two ends of energy-storage travelling wave tube by two diodes and resistance, to judge
Whether alternating current disconnects；
The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal occurs
Unit obtains the electrically disconnected signal of exchange from AC dump detecting unit, then controls discharge cell to be discharged for energy-storage travelling wave tube.
As a preferred embodiment of the present invention, the exchange detecting unit include two diodes, resistance, two
Phase inverter, XOR gate；
Above-mentioned two diode and resistance are coupled in the two ends of energy-storage travelling wave tube；The AC signal at energy-storage travelling wave tube two ends passes through two
After individual diode and a resistance, the AC signal of input AC detecting unit is half wave rectified signal；
Described two phase inverters are the different phase inverter of two threshold values, and its threshold value is respectively V1 and V2, and wherein V1 is more than V2；
Input sine wave is converted into two square-wave signals using two phase inverters, because the two square-wave signals are same sine
Ripple is produced, so it has identical phase and cycle, there is different the time that only rising edge and trailing edge occur；Two
Individual square-wave signal handles the pulse signal that the cycle that obtains is sine wave period by XOR gate；
The characteristics of this pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply,
Pulse signal occurs, and with alternating current same period, its pulse width controls by the threshold value of two phase inverters；Thus, obtain
Whether detecting alternating current is powered, and exports corresponding signal.
As a preferred embodiment of the present invention, the exchange detecting unit includes：
Half-wave rectification block, the AC signal at energy-storage travelling wave tube two ends is converted into half wave rectified signal；
Two square wave modular converters, the sine wave half-wave rectification block to be exported is converted to two square-wave signals；
Pulse signal generation module, two square-wave signals are converted into the pulse signal that the cycle is sine wave period.
As a preferred embodiment of the present invention, the control signal generating unit is used to be provided according to exchange detecting unit
Pulse signal or low level signal to provide control signal for discharge switch；Wherein, when alternating current is powered, exchange detecting is single
Member provides pulse signal, and low level signal is provided when alternating current is powered off.
As a preferred embodiment of the present invention, the control signal generating unit includes the first current source, the second electric current
Source；First current source is controlled to exchange the output signal of detecting unit, and when output signal is high level, the first current source is beaten
Open, charged to electric capacity；Second current source is constant-current source, and its control signal is constant high level；In two above current source, first
The current value of current source is much larger than the current value of the second current source；
The alternating current continued power when, electric capacity charging end will be charged to high level；When electric capacity is charged to high electricity
After flat, as long as the pulse signal of exchange detecting unit output does not stop, it is just always maintained at high level state；
But when exchanging electrically disconnected, the pulse control signal of the first current source is changed into low level, current source cut-off；Now only
There is the second current source continuous discharge, until capacitance charge is all discharged；
The output signal of the electric capacity passes through the processing module being made up of Schmidt trigger and XOR gate, produces electric discharge and opens
Control signal is closed, the signal is that the high level pulse signal of one fixed width occurs after AC-powered disconnection.
As a preferred embodiment of the present invention, the discharge cell includes MOS switch and its protection circuit, in switch control
Under the control of signal processed, when exchanging electrically disconnected, control of discharge is carried out to energy-storage travelling wave tube.
A kind of automatic discharging method of above-mentioned automatic discharge circuit, the automatic discharging method comprises the following steps：
AC dump detects step：AC dump detecting unit judges whether alternating current disconnects, and occurs to control signal
Unit feedback detecting information；
Control of discharge step：If control signal generating unit obtains the electrically disconnected letter of exchange from AC dump detecting unit
Number, then control discharge cell to be discharged for energy-storage travelling wave tube.
As a preferred embodiment of the present invention, the exchange detecting unit include two diodes, resistance, two
Phase inverter, XOR gate；
AC dump detecting step is specifically included：
Step S11, energy-storage travelling wave tube two ends AC signal after two diodes and a resistance, input AC detecting
The AC signal of unit is half wave rectified signal；
Step S12, using two phase inverters input sine wave is converted into two square-wave signals, due to the two square waves letter
Number produced for same sine wave, so it has identical phase and cycle, only rising edge and trailing edge occur when
Between have different；
Step S13, two square-wave signals handle the pulse signal that the cycle that obtains is sine wave period by XOR gate；This
The characteristics of pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply, pulse signal occurs,
And with alternating current same period, its pulse width is controlled by the threshold value of two phase inverters；Thus, detecting alternating current is obtained to be powered
Whether, and export corresponding signal.
As a preferred embodiment of the present invention, the control signal generating unit includes the first current source, the second electric current
Source；The current value of first current source is much larger than the current value of the second current source；
The control of discharge step is specifically included：
First current source is controlled to exchange the output signal of detecting unit, when output signal is high level, the first electricity
Stream source is opened, and is charged to electric capacity；Second current source is constant-current source, and its control signal is constant high level；
The alternating current continued power when, electric capacity charging end will be charged to high level；When electric capacity is charged to high electricity
After flat, as long as the pulse signal of exchange detecting unit output does not stop, it is just always maintained at high level state；
But when exchanging electrically disconnected, the pulse control signal of the first current source is changed into low level, current source cut-off；Now only
There is the second current source continuous discharge, until capacitance charge is all discharged；
The output signal of the electric capacity passes through the processing module being made up of Schmidt trigger and XOR gate, produces electric discharge and opens
Control signal is closed, the signal is that the high level pulse signal of one fixed width occurs after AC-powered disconnection.
The beneficial effects of the present invention are：
Energy-storage travelling wave tube proposed by the present invention powers off automatic discharge circuit, in the case of normal ON power supply, and this is integrated to put
Circuit only consumes microwatt level power, is 1% of power consumption spent by original X capacitor discharge resistance.After dump, this is integrated
Discharge circuit can complete the discharging function of X capacitor discharge resistance.The electric discharge peace of the energy-storage travelling wave tubes such as X electric capacity was so both can guarantee that
Entirely, the power wastage that X capacitor discharge resistive band comes is avoided that again.
Due to needing to consider power problemses, the resistance that X capacitor discharge resistance general at present is used is larger, its discharge current
It is smaller, X capacitance charges are released complete effect within the security regulations time in order to reach, the X electric capacity that user can select holds
Value is very limited.But after integrated X electric capacity power-off automatic discharge circuit proposed by the present invention, the electric current that sparks can be with
5~10 times of original X capacitor discharge resistance are increased to, client can use the X electric capacity of bigger capacitance, so as in energy-conservation
Under the premise of optimize its equipment performance.
Brief description of the drawings
Fig. 1 is the composition schematic diagram of automatic discharge circuit of the present invention.
Fig. 2 is the circuit diagram of AC dump detecting unit in automatic discharge circuit of the present invention.
Fig. 3 is the signal transacting schematic diagram of AC dump detecting unit in automatic discharge circuit of the present invention.
Fig. 4 is the circuit diagram of control signal generating unit in automatic discharge circuit of the present invention.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one
Referring to Fig. 1, powering off automatic discharge circuit, the automatic discharge circuit bag present invention is disclosed a kind of energy-storage travelling wave tube
Include the AC dump detecting unit 1 being sequentially connected, control signal generating unit 2 and discharge cell 3.In the present embodiment, energy storage member
Part is X electric capacity, it is of course also possible to be other energy-storage travelling wave tubes.
The AC dump detecting unit 1 is coupled in the two ends of X electric capacity by two diodes and resistance, to judge to hand over
Whether stream electricity disconnects；The control signal generating unit 2 is connected with AC dump detecting unit 1, discharge cell 3, if control
Signal generating unit 2 obtains the electrically disconnected signal of exchange from AC dump detecting unit 1, then it is that X electric capacity is put to control discharge cell 3
Electricity.
Referring to Fig. 2,101 being energy-storage travelling wave tube in figure, 102 being energy-storage travelling wave tube power-off automatic discharge circuit, 103 being the circuit
In exchange detecting unit integration section, 104 be control signal generating unit, 105 be electric discharge MOS switch.It is wherein described to hand over
Flowing detecting unit 1 includes two diodes, a resistance and the integration section 103 for exchanging detecting unit, wherein exchange detecting is single
The integration section 103 of member includes two phase inverters and XOR gate.Above-mentioned two diode and resistance are coupled in the two ends of X electric capacity.
The operation principle of above-mentioned exchange detecting unit passes through two two incorporated by reference to Fig. 3, the AC signal 201 at X electric capacity two ends
After pole pipe and a resistance processing, the AC signal of input AC detecting unit is half wave rectified signal 202.It is described two anti-phase
Device is the different phase inverter of two threshold values, and its threshold value is respectively V1 and V2, and wherein V1 is more than V2；Will be defeated using two phase inverters
Enter sine wave (i.e. above-mentioned half wave rectified signal 202) and be converted to two square-wave signals 204,205, due to the two square-wave signals
204th, 205 be that same sine wave is produced, so it has identical phase and cycle, only rising edge and trailing edge occur
Time have different.Two square-wave signals 204,205 handle the pulse that the cycle that obtains is sine wave period by XOR gate
Signal 206.The characteristics of this pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply,
Pulse signal occurs, and with alternating current same period, its pulse width controls by the threshold value of two phase inverters；Thus, obtain
Whether detecting alternating current is powered, and exports corresponding signal.
The control signal generating unit be used to according to exchange detecting unit provide pulse signal or low level signal come
Control signal is provided for discharge switch；Wherein, when alternating current is powered, exchange detecting unit provides pulse signal, works as alternating current
Low level signal is provided during power-off.
104 be control signal generating unit in Fig. 2, and its concrete composition is referring to Fig. 4, the control signal generating unit bag
Include the first current source 302, the second current source 303, electric capacity 304.First current source 302 for exchange detecting unit output signal institute
Control, when output signal is high level, the first current source 302 is opened, and is charged to electric capacity 304；Second current source 303 is constant current
Source, its control signal is constant high level.In two above current source, the current value of the first current source 302 is much larger than the second electricity
The current value in stream source 303.
When alternating current continued power, electric capacity 304 charging end will be charged to high level, during its process is Fig. 4
The corresponding signal segment of mark 305.After electric capacity 304 is charged to high level, as long as the pulse signal of exchange detecting unit output
Do not stop, it is just always maintained at high level state, its process is the corresponding signal segment of mark 306 in Fig. 4.But when alternating current is disconnected
When opening, the pulse control signal of the first current source 302 is changed into low level, and the first current source 302 ends；Now there was only the second electric current
The continuous discharge of source 303, the signal segment of the charging end signal intensity such as expression of mark 307 of electric capacity 304, until the electric charge quilt of electric capacity 304
All release, the stage represented into the mark 308 in Fig. 4.
The output signal (output signals of 305,306,307 and 308 compositions) of the electric capacity 304 is by by schmidt trigger
The processing module 309 of device and XOR gate composition, produces discharge switch control signal 310, and the signal is to be disconnected in AC-powered
The high level pulse signal of one fixed width occurs afterwards.
The discharge cell 3 includes MOS switch and its protection circuit, under the control of switch controlling signal 310, works as exchange
When electrically disconnected, control of discharge is carried out to X electric capacity.
The composition of automatic discharge circuit of the present invention is described above, the present invention is also disclosed while foregoing circuit is disclosed
A kind of automatic discharging method of above-mentioned automatic discharge circuit；The automatic discharging method comprises the following steps：
【Step S1】AC dump detects step：AC dump detecting unit judges whether alternating current disconnects, and to control
Signal generating unit feedback detecting information.Specifically include：
The AC signal at step S11, X electric capacity two ends is after two diodes and a resistance, and input AC detecting is single
The AC signal of member is half wave rectified signal；
Step S12, using two phase inverters input sine wave is converted into two square-wave signals, due to the two square waves letter
Number produced for same sine wave, so it has identical phase and cycle, only rising edge and trailing edge occur when
Between have different；
Step S13, two square-wave signals handle the pulse signal that the cycle that obtains is sine wave period by XOR gate；This
The characteristics of pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply, pulse signal occurs,
And with alternating current same period, its pulse width is controlled by the threshold value of two phase inverters；Thus, detecting alternating current is obtained to be powered
Whether, and export corresponding signal.
【Step S2】Control of discharge step：If control signal generating unit obtains alternating current from AC dump detecting unit
The signal of disconnection, then it is X capacitor discharge to control discharge cell.Specifically include：
First current source is controlled to exchange the output signal of detecting unit, when output signal is high level, the first electricity
Stream source is opened, and is charged to electric capacity；Second current source is constant-current source, and its control signal is constant high level；
The alternating current continued power when, electric capacity charging end will be charged to high level；When electric capacity is charged to high electricity
After flat, as long as the pulse signal of exchange detecting unit output does not stop, it is just always maintained at high level state；
But when exchanging electrically disconnected, the pulse control signal of the first current source is changed into low level, current source cut-off；Now only
There is the second current source continuous discharge, until capacitance charge is all discharged；
The output signal of the electric capacity passes through the processing module being made up of Schmidt trigger and XOR gate, produces electric discharge and opens
Control signal is closed, the signal is that the high level pulse signal of one fixed width occurs after AC-powered disconnection.
Embodiment two
The present invention discloses a kind of energy-storage travelling wave tube power-off automatic discharge circuit, and the automatic discharge circuit includes：AC dump
Detecting unit, control signal generating unit and discharge cell；
The AC dump detecting unit is to judge whether alternating current disconnects；Such as by two diodes and resistance (
Can be other elements) two ends of energy-storage travelling wave tube are coupled in judge.
The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal occurs
Unit obtains the electrically disconnected signal of exchange from AC dump detecting unit, then controls discharge cell to be discharged for energy-storage travelling wave tube.
In the present embodiment, the exchange detecting unit can include：Half-wave rectification block, two square wave modular converters, arteries and veins
Rush signal generator module.Half-wave rectification block by the AC signal at X electric capacity two ends to be converted to half wave rectified signal；Two sides
Ripple modular converter is converted to two square-wave signals to the sine wave for exporting half-wave rectification block；Pulse signal generation module is used
So that two square-wave signals are converted into pulse signal of the cycle as sine wave period.
In summary, energy-storage travelling wave tube power-off automatic discharge circuit proposed by the present invention, in the case of normal ON power supply,
The integrated discharge circuit only consumes microwatt level power, is 1% of power consumption spent by original X capacitor discharge resistance.Work as dump
Afterwards, the integrated discharge circuit can complete the discharging function of X capacitor discharge resistance.The energy-storage travelling wave tubes such as X electric capacity were so both can guarantee that
Electric discharge safety, be avoided that again X capacitor discharge resistive band come power wastage.
Due to needing to consider power problemses, the resistance that X capacitor discharge resistance general at present is used is larger, its discharge current
It is smaller, X capacitance charges are released complete effect within the security regulations time in order to reach, the X electric capacity that user can select holds
Value is very limited.But after integrated X electric capacity power-off automatic discharge circuit proposed by the present invention, the electric current that sparks can be with
5~10 times of original X capacitor discharge resistance are increased to, client can use the X electric capacity of bigger capacitance, so as in energy-conservation
Under the premise of optimize its equipment performance.
Here description of the invention and application be illustrative, be not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where not departing from scope and spirit of the present invention, embodiments disclosed herein can be entered
The other deformations of row and change.
Claims (9)
1. a kind of energy-storage travelling wave tube powers off automatic discharge circuit, it is characterised in that the automatic discharge circuit includes：AC dump is detectd
Survey unit, control signal generating unit and discharge cell；The energy-storage travelling wave tube is X electric capacity；
The AC dump detecting unit is coupled in the two ends of X electric capacity by two diodes and resistance, to judge alternating current
Whether disconnect；The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal occurs
Unit obtains the electrically disconnected signal of exchange from AC dump detecting unit, then it is X capacitor discharge to control discharge cell；
The AC dump detecting unit includes two diodes, resistance, two phase inverters, an XOR gates；Above-mentioned two two
Pole pipe and resistance are coupled in the two ends of X electric capacity；The AC signal (201) at X electric capacity two ends passes through two diodes and a resistance
Afterwards, the AC signal of input AC power-off detecting unit is half wave rectified signal (202)；Described two phase inverters are two threshold values
Different phase inverters, its threshold value is respectively V1 and V2, and wherein V1 is more than V2；Input sine wave is changed using two phase inverters
For two square-wave signals (204,205), because the two square-wave signals are that same sine wave is produced, so it has identical
There are different phase and cycle, the time that only rising edge and trailing edge occur；Two square-wave signals (204,205) are passed through
XOR gate processing obtains the pulse signal (206) that the cycle is sine wave period；The characteristics of this pulse signal is：When alternating current is disconnected
When electric, pulse signal disappears；When alternating current regular supply, pulse signal occur, and with alternating current same period, its pulse
Width is controlled by the threshold value of two phase inverters；Thus, obtain detecting alternating current whether to be powered, and export corresponding signal；
The control signal generating unit be used to according to AC dump detecting unit provide pulse signal or low level signal come
Control signal is provided for discharge switch；Wherein, when alternating current is powered, AC dump detecting unit provides pulse signal, works as friendship
Low level signal is provided during stream electricity power-off；
The control signal generating unit includes the first current source (302), the second current source (303), electric capacity (304)；First electricity
Stream source (302) is controlled by the output signal (301) of AC dump detecting unit, when output signal (301) is high level, the
One current source (302) is opened, and is charged to electric capacity (304)；Second current source (303) is constant-current source, and its control signal is constant height
Level；In two above current source, the current value of the first current source (302) is much larger than the current value of the second current source (303)；
When alternating current continued power, electric capacity (304) charging end will be charged to high level；When electric capacity (304) is charged to high level
Afterwards, as long as the pulse signal of AC dump detecting unit output does not stop, it is just always maintained at high level state；But work as alternating current
During disconnection, the pulse control signal of the first current source (302) is changed into low level, the first current source (302) cut-off；Now only the
Two current sources (303) continuous discharge, until capacitance charge is all discharged；The output signal of the electric capacity (304) is passed through by applying
The processing module (309) of schmitt trigger and XOR gate composition, produces discharge switch control signal (310), and the signal is to hand over
After disconnecting the high level pulse signal of one fixed width occurs for stream electricity power supply；
The discharge cell includes MOS switch and its protection circuit, under the control of switch controlling signal (310), works as alternating current
During disconnection, control of discharge is carried out to X electric capacity.
2. a kind of energy-storage travelling wave tube powers off automatic discharge circuit, it is characterised in that the automatic discharge circuit includes：AC dump is detectd
Survey unit, control signal generating unit and discharge cell；
The AC dump detecting unit is coupled in the two ends of energy-storage travelling wave tube by two diodes and resistance, to judge exchange
Whether electricity disconnects；
The control signal generating unit is connected with AC dump detecting unit, discharge cell, if control signal generating unit
The electrically disconnected signal of exchange is obtained from AC dump detecting unit, then controls discharge cell to be discharged for energy-storage travelling wave tube；
The control signal generating unit be used to according to AC dump detecting unit provide pulse signal or low level signal come
Control signal is provided for discharge switch；Wherein, when alternating current is powered, AC dump detecting unit provides pulse signal, works as friendship
Low level signal is provided during stream electricity power-off.
3. energy-storage travelling wave tube according to claim 2 powers off automatic discharge circuit, it is characterised in that：
The AC dump detecting unit includes two diodes, resistance, two phase inverters, an XOR gates；
Above-mentioned two diode and resistance are coupled in the two ends of energy-storage travelling wave tube；The AC signal (201) at energy-storage travelling wave tube two ends passes through
After two diodes and a resistance, the AC signal of input AC power-off detecting unit is half wave rectified signal (202)；
Described two phase inverters are the different phase inverter of two threshold values, and its threshold value is respectively V1 and V2, and wherein V1 is more than V2；Utilize
Input sine wave is converted to two square-wave signals (204,205) by two phase inverters, because the two square-wave signals are same
Individual sine wave is produced, so it has identical phase and cycle, the time that only rising edge and trailing edge occur has necessarily
Difference；Two square-wave signals (204,205) handle the pulse signal (206) that the cycle that obtains is sine wave period by XOR gate；
The characteristics of this pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply, pulse
Signal occurs, and with alternating current same period, its pulse width controls by the threshold value of two phase inverters；Thus, detected
Whether alternating current is powered, and exports corresponding signal.
4. energy-storage travelling wave tube according to claim 2 powers off automatic discharge circuit, it is characterised in that：
The AC dump detecting unit includes：
Half-wave rectification block, the AC signal at energy-storage travelling wave tube two ends is converted into half wave rectified signal；
Two square wave modular converters, the sine wave half-wave rectification block to be exported is converted to two square-wave signals；
Pulse signal generation module, two square-wave signals are converted into the pulse signal that the cycle is sine wave period.
5. energy-storage travelling wave tube according to claim 2 powers off automatic discharge circuit, it is characterised in that：
The control signal generating unit includes the first current source (302), the second current source (303), electric capacity (304)；First electricity
Stream source (302) is controlled by the output signal (301) of AC dump detecting unit, when output signal (301) is high level, the
One current source (302) is opened, and is charged to electric capacity (304)；Second current source (303) is constant-current source, and its control signal is constant height
Level；In two above current source, the current value of the first current source (302) is much larger than the current value of the second current source (303)；
When alternating current continued power, electric capacity (304) charging end will be charged to high level；When electric capacity (304) is charged to
After high level, as long as the pulse signal of AC dump detecting unit output does not stop, it is just always maintained at high level state；
But when exchanging electrically disconnected, the pulse control signal of the first current source (302) is changed into low level, the first current source (302)
Cut-off；Now there was only the second current source (303) continuous discharge, until capacitance charge is all discharged；
The output signal of the electric capacity (304) passes through the processing module (309) being made up of Schmidt trigger and XOR gate, produces
Discharge switch control signal (310), the signal is that the high level pulse signal of one fixed width occurs after AC-powered disconnection.
6. energy-storage travelling wave tube according to claim 2 powers off automatic discharge circuit, it is characterised in that：
The discharge cell includes MOS switch and its protection circuit, under the control of switch controlling signal (310), works as alternating current
During disconnection, control of discharge is carried out to energy-storage travelling wave tube.
7. the automatic discharging method of one of a kind of claim 1 to 6 automatic discharge circuit, it is characterised in that described automatic
Charging method comprises the following steps：
AC dump detects step：AC dump detecting unit judges whether alternating current disconnects, and to control signal generating unit
Feedback detecting information；
Control of discharge step：If control signal generating unit obtains the electrically disconnected signal of exchange from AC dump detecting unit,
Discharge cell is then controlled to be discharged for energy-storage travelling wave tube.
8. automatic discharging method according to claim 7, it is characterised in that：
The AC dump detecting unit includes two diodes, resistance, two phase inverters, an XOR gates；
AC dump detecting step is specifically included：
Step S11, energy-storage travelling wave tube two ends AC signal (201) after two diodes and a resistance, input AC break
The AC signal of electric detecting unit is half wave rectified signal (202)；
Step S12, using two phase inverters input sine wave is converted into two square-wave signals (204,205), due to the two
Square-wave signal is produced for same sine wave, so it has identical phase and cycle, only rising edge and trailing edge are sent out
There is different the raw time；
Step S13, two square-wave signals (204,205) handle the pulse signal that the cycle that obtains is sine wave period by XOR gate
(206)；The characteristics of this pulse signal is：When alternating current is powered off, pulse signal disappears；When alternating current regular supply, arteries and veins
Rush signal, and with alternating current same period, its pulse width controls by the threshold value of two phase inverters；Thus, detectd
Survey alternating current whether to be powered, and export corresponding signal.
9. automatic discharging method according to claim 7, it is characterised in that：
The control signal generating unit includes the first current source (302), the second current source (303)；First current source (302)
Current value is much larger than the current value of the second current source (303)；
The control of discharge step is specifically included：
First current source (302) is controlled by the output signal (301) of AC dump detecting unit, when output signal (301) is
During high level, the first current source (302) is opened, and is charged to electric capacity (304)；Second current source (303) is constant-current source, and it controls letter
Number be constant high level；
When alternating current continued power, electric capacity (304) charging end will be charged to high level；When electric capacity (304) is charged to
After high level, as long as the pulse signal of AC dump detecting unit output does not stop, it is just always maintained at high level state；
But when exchanging electrically disconnected, the pulse control signal of the first current source (302) is changed into low level, current source cut-off；Now
Only the second current source (303) continuous discharge, until capacitance charge is all discharged；
The output signal of the electric capacity (304) passes through the processing module (309) being made up of Schmidt trigger and XOR gate, produces
Discharge switch control signal (310), the signal is that the high level pulse signal of one fixed width occurs after AC-powered disconnection.
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| CN101382569A (en) * | 2007-09-05 | 2009-03-11 | 深圳Tcl新技术有限公司 | Circuit breaking test device |
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