CN106405260B - The saturation point measuring device and saturation point measurement method of energy-storage travelling wave tube - Google Patents
The saturation point measuring device and saturation point measurement method of energy-storage travelling wave tube Download PDFInfo
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- CN106405260B CN106405260B CN201510456982.XA CN201510456982A CN106405260B CN 106405260 B CN106405260 B CN 106405260B CN 201510456982 A CN201510456982 A CN 201510456982A CN 106405260 B CN106405260 B CN 106405260B
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Abstract
A kind of the saturation point measuring device and saturation point measurement method of energy-storage travelling wave tube, the saturation point measuring device of energy-storage travelling wave tube include DC power supply, arresting element, switch element, on-off cycle controller, current slope sensor and current slope comparator.Arresting element is in parallel with energy-storage travelling wave tube.Switch element connects arresting element and DC power supply.On-off cycle controller is electrically connected to current slope comparator and switch element, and the wave width modulating signal that on-off cycle controller generation duty ratio gradually increases at any time is with driving switch element.Current slope sensor senses the electric current by energy-storage travelling wave tube with preset frequency, and the electric current measured is converted to current slope.Current slope comparator is electrically connected to current slope sensor, to receive the current slope of current slope sensor output and compare current slope, wherein obtaining saturation point when waiting current slopes unequal.
Description
Technical field
The present invention relates to a kind of measuring equipment of energy-storage travelling wave tube and its measurement methods, and in particular to a kind of energy-storage travelling wave tube
Saturation point measuring device and saturation point measurement method.
Background technique
Energy-storage travelling wave tube, for example, transformer or inductor, are usually made of winding and magnetic core, have energy storage, energy
The characteristics such as conversion and electrical isolation are electronic components essential to constituting power circuit.
Under general operation state, increase that the magnetic flux density of energy-storage travelling wave tube can be directly proportional with the increase of electric current；So
And when the magnetic flux density in energy-storage travelling wave tube reaches particular value, even if impressed current gradually increases, magnetic flux density is still kept
Constant physical phenomenon is known as magnetic saturation.In short, magnetic saturation refers to the magnetic flux density of energy-storage travelling wave tube no longer with impressed current
Increase and the phenomenon that significantly increase.
When energy-storage travelling wave tube magnetic saturation, the inductance of winding can be substantially reduced, and be caused in magnetic core element or power circuit
The overheat or damage of other elements.
Summary of the invention
The purpose of the present invention is to provide a kind of saturation point measuring devices of energy-storage travelling wave tube, by current slope to obtain
Obtain the saturation point of energy-storage travelling wave tube.
A kind of saturation point measuring device of energy-storage travelling wave tube is provided according to the present invention, to measure the magnetic saturation of energy-storage travelling wave tube
Point.Energy-storage travelling wave tube has operating frequency, and is located at the first end point and the second endpoint of the saturation point measuring device of energy-storage travelling wave tube
Between.The saturation point measuring device of energy-storage travelling wave tube include DC power supply, arresting element, switch element, on-off cycle controller,
Current slope sensor and current slope comparator.DC power supply includes positive voltage level end and negative voltage level end, positive voltage
Level end connects first end point.Arresting element is connected across between first end point and second endpoint.Switch element connects arresting element
And negative voltage level end.On-off cycle controller is electrically connected to current slope comparator and switch element, on-off cycle controller
Pulse wave width modulation signal is generated according to operating frequency to drive switch element repeat to open and be closed, pulse bandwidth
The duty ratio of modulating signal increases as the time increases.Current slope sensor is coupled to the second endpoint, current slope sensing
Device is sensed with preset frequency through the electric current of energy-storage travelling wave tube, and it is oblique that the electric current at adjacent two time point measured is converted to electric current
Rate.Current slope comparator is electrically connected to current slope sensor, and current slope comparator receives the output of current slope sensor
Current slope, and compare current slope, wherein when equal current slopes are unequal, i.e. acquisition saturation point.
A kind of saturation point measurement method is separately provided according to the present invention, suitable for measuring a magnetic saturation of an energy-storage travelling wave tube
Point, magnetic saturation measurement method comprise the following steps: (a) providing DC power supply according to the operation voltage of energy-storage travelling wave tube and operating frequency
And the pulse wave width modulation signal with operating frequency gives energy-storage travelling wave tube, wherein the duty ratio of pulse wave width modulation signal is at any time
Between increase and be gradually increased；(b) it is converted every predetermined time sensing conducting in the electric current of energy-storage travelling wave tube, and by the electric current measured
For multiple current slopes；And (c) compare current slope value, and when adjacent two current slope is unequal, obtain energy-storage travelling wave tube
Saturation point.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is painted the circuit block diagram of the saturation point measuring device of energy-storage travelling wave tube of the invention；And
Fig. 2 is painted the current versus time relationship figure of energy-storage travelling wave tube.
Wherein, appended drawing reference
The saturation point measuring device of 10 energy-storage travelling wave tubes
100 DC power supplies
110 arresting elements
120 switch elements
130 on-off cycle controllers
140 current slope sensors
150 current slope comparators
30 energy-storage travelling wave tubes
300 armature windings
302 secondary windings
A first end point
The second endpoint of b
P1 high levle electrode tip
P2 low level electrode tip
Q turning point
RL load
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
Fig. 1 is please referred to, is the circuit block diagram of the saturation point measuring device of energy-storage travelling wave tube of the invention.It is shown in FIG. 1
Saturation point of the saturation point measuring device 10 of energy-storage travelling wave tube to measure energy-storage travelling wave tube 30.Wherein, energy-storage travelling wave tube 30 is default
There are operation voltage and operating frequency.The saturation point measuring device 10 of energy-storage travelling wave tube includes the first end point of connection energy-storage travelling wave tube 30
A and the second endpoint b.In Fig. 1, energy-storage travelling wave tube 30 is using transformer as illustrative example, and the armature winding 300 of transformer connects
Load RL ground connection can be passed through in the secondary windings 302 of first end point a and the second endpoint b, transformer.When energy-storage travelling wave tube 30 is inductance
When device, the winding of inductor is connected across between first end point a and the second endpoint b.
The saturation point measuring device 10 of energy-storage travelling wave tube include DC power supply 100, arresting element 110, switch element 120,
On-off cycle controller 130, current slope sensor 140 and current slope comparator 150.DC power supply 100 is to provide survey
Measure the voltage of the saturation point of energy-storage travelling wave tube 30, wherein it is preset that the voltage that DC power supply 100 exports is identical to energy-storage travelling wave tube 30
Operate the crest voltage of voltage.
Arresting element 110 is connected across first end point a and the second endpoint b, with energy-storage travelling wave tube 30 in and downlink connection.Electric discharge member
Part 110 includes low level electrode tip P1 and high levle electrode tip P2.Apply when the electric power for being applied to high levle electrode tip P2 is higher than
In the electric power of low level electrode tip P1, short-circuit condition is presented in arresting element 110, and electric current can be flowed to by high levle electrode tip P2
Low level electrode tip P1, the then electric energy being stored on energy-storage travelling wave tube 30 can discharge.When being applied to high levle electrode tip P2's
When electric power is lower than the electric power for being applied to low level electrode tip P1, open-circuit condition is presented in arresting element 110, and no current passes through electric discharge
Element 110.The low level electrode tip P1 of arresting element 110 is electrically connected to the high voltage level end (+) and first of DC power supply 100
The high levle electrode tip P1 of endpoint a, arresting element 110 are electrically connected to the second endpoint b and current slope sensor 140.In Fig. 1
In, arresting element 110 is realized with diode, and the cathode (i.e. low level electrode tip) of diode is electrically connected to first end point a, sun
Pole (i.e. high levle electrode tip) is electrically connected to the second endpoint b.
Switch element 120 is located at the high levle electrode tip P2 of arresting element 110 and the negative voltage level end of DC power supply 100
Between (-), and receives the control signal of the sending of on-off cycle controller 130 and carry out closure or openness, wherein switch periods control
The control signal that device 130 processed issues is pulse width modulation signal.Current slope sensor 140 is located at the second endpoint b, to
Sensing passes through the electric current of energy-storage travelling wave tube 30；Wherein, current slope sensor 140 can be for example comprising Hall effect (Hall
Effect) current sensor.Current slope comparator 150 is electrically connected to current slope sensor 140 and on-off cycle controller
130。
Voltage value on energy-storage travelling wave tube 30 is the product of its inductance value and current variation rate, i.e.,
V=L (dI/dt)
；Wherein:
V is the voltage value on energy-storage travelling wave tube；
L is the inductance value of the winding of energy-storage travelling wave tube；And
DI/dt is current variation amount.
Meanwhile before energy-storage travelling wave tube 30 not up to saturation point, the magnetic flux density of energy-storage travelling wave tube 30 can be with electric current
Increase and directly proportional increase；That is, as the turn-on time of energy-storage travelling wave tube 30 increases, be connected in the electric current meeting of energy-storage travelling wave tube 30
Increased with first slope, as Fig. 2 is shown in solid.After energy-storage travelling wave tube 30 reaches saturation point, due to the inductance of energy-storage travelling wave tube 30
Amount decline, therefore conducting can be increased significantly in the electric current of energy-storage travelling wave tube 30；In other words, after through saturation point, with energy storage member
The turn-on time of part 30 increases, and the electric current be connected in energy-storage travelling wave tube 30 can be increased with the second slope for being greater than first slope, such as Fig. 2
Shown in dotted line.Therefore, the turning point Q between first slope and the second slope, the as saturation point of energy-storage travelling wave tube 30.
In the saturation point measurement for carrying out energy-storage travelling wave tube 30 it may first have to keep the output voltage of DC power supply 100 equal
In the crest voltage of the predetermined registration operation voltage of energy-storage travelling wave tube 30, and the necessary output phase of on-off cycle controller 130 is equal to energy storage member
Movement of the control signal of the predetermined registration operation frequency of part 30 to drive switch element 120 to repeat to open and be closed；Wherein, when
When switch element 120 is closed, DC power supply 10 charges to energy-storage travelling wave tube 30, then current slope sensor 140 and can measure conducting
In the electric current of energy-storage travelling wave tube 30, when switch element 120 is opened, then energy-storage travelling wave tube 30 can be put by arresting element 110
Electricity.In addition, on-off cycle controller 130 can gradually increase the duty ratio (dutycycle) of the pulse width modulation signal of output,
To increase the turn-on time of energy-storage travelling wave tube 30, raising can be corresponded in the electric current of energy-storage travelling wave tube 30 by causing to be connected.
Then, it is connected with predetermined time interval detecting in the electric current of energy-storage travelling wave tube 30 by current slope sensor 140, and
The conducting of at least three different time points is obtained in the electric current of energy-storage travelling wave tube 30；Then, the electric current between operation adjacent two time point is oblique
Rate (i.e. current change quantity), and at least two current slopes after operation are transferred to current slope comparator 150.Want special herein
Not mentionleting alone the frequency of bright, to export by on-off cycle controller 130 pulse width modulation signal, to be identical to energy-storage travelling wave tube 30 pre-
If operating frequency, be only the different adjustment of duty ratio, therefore, by suitably adjust current slope sensor 140 sensing lead
The predetermined time interval of the electric current of energy-storage travelling wave tube 30 is passed through, the electric current of corresponding different duty can be measured.
At least two current slopes that current slope comparator 150 is exported by comparing current slope sensor 140, to take
Obtain the saturation point of energy-storage travelling wave tube 30.More specifically, current slope comparator 150 is by judging at least two electricity above-mentioned
Whether equal slope is flowed, to judge whether energy-storage travelling wave tube 30 is saturated；Wherein, if two current slopes are equal, judge energy-storage travelling wave tube
30 do not reach saturation point, and if two current slopes are unequal, judge that energy-storage travelling wave tube 30 reaches saturation point.
If being indicated with mathematical expression, when energy-storage travelling wave tube 30 does not reach saturation point, meets following condition 1, work as energy-storage travelling wave tube
30 when reaching saturation point, meets following condition 2:
；Wherein:
In-1For in time point tn-1When, it is connected in the electric current of energy-storage travelling wave tube 30；
InFor in time point tnWhen, conducting is in the electric current of energy-storage travelling wave tube 30, wherein time point tnWith time point tn-1Before interval
State the predetermined time；
In+1For in time point tn+1When, conducting is in the electric current of energy-storage travelling wave tube 30, wherein time point tn+1With time point tnInterval
The aforementioned predetermined time.
If current slope comparator 150 judges that energy-storage travelling wave tube 30 is unsaturated, exports notification signal to switch periods and control
Device 130 drives on-off cycle controller 130 to improve the duty ratio of the pulse wave width modulation signal of output, to improve switch element
120 turn-on time, until energy-storage travelling wave tube 30 reaches saturation.
In conclusion the method for the saturation point of measurement energy-storage travelling wave tube 30 comprises the following steps.
Firstly, obtaining the preset operation voltage of energy-storage travelling wave tube 30 and operating frequency, and according to operation voltage and operating frequency
DC power supply 100 is provided and the pulse wave width modulation signal with operating frequency gives energy-storage travelling wave tube 30.Wherein, DC power supply 100
The voltage of output is identical to the peak value of the preset operation voltage of energy-storage travelling wave tube 30, and the duty ratio of pulse wave width modulation signal can be with
The increase of time and be gradually increased.
Then, it is converted every predetermined time sensing conducting in the electric current of energy-storage travelling wave tube 30, and by the multiple electric currents measured
For multiple current slopes.Wherein, it is default to be identical to energy-storage travelling wave tube 30 in the predetermined time of the electric current of energy-storage travelling wave tube 30 for sensing conducting
The single cycle time of operating frequency, and each current slope is obtained by current operator between adjacent two time point.
Finally, comparing current slope value.When adjacent two current slope is unequal, that is, obtain the magnetic saturation of energy-storage travelling wave tube
Point；If adjacent two current slope is unequal, the duty ratio of constantly improve pulse wave width modulation signal.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (10)
1. a kind of saturation point measuring device of energy-storage travelling wave tube, to measure the saturation point of an energy-storage travelling wave tube, the energy-storage travelling wave tube
With an operating frequency, and the energy-storage travelling wave tube be located at the saturation point measuring device of the energy-storage travelling wave tube a first end point and
Between one second endpoint, which is characterized in that the saturation point measuring device of the energy-storage travelling wave tube includes:
One DC power supply includes a positive voltage level end and a negative voltage level end, which connects the first end
Point；
One arresting element is connected across between the first end point and second endpoint；
One switch element connects the arresting element and the negative voltage level end；
One on-off cycle controller is electrically connected to the switch element, and wherein the on-off cycle controller is produced according to the operating frequency
To drive the switch element to repeat to open and be closed, which accounts for a raw pulse wave width modulation signal
Sky increases than increasing with the time；
One current slope sensor is coupled to second endpoint, and the current slope sensor is with operating frequency sensing by being somebody's turn to do
The electric current of energy-storage travelling wave tube, and the electric current of the two adjacent time measured point is converted into current slope；And
One current slope comparator is electrically connected to the current slope sensor and the on-off cycle controller, the current slope ratio
Multiple current slopes that the current slope sensor exports, and more the multiple current slope are received compared with device, wherein when described
When multiple current slopes are unequal, the saturation point is obtained.
2. the saturation point measuring device of energy-storage travelling wave tube according to claim 1, which is characterized in that when the multiple electric current
When slope is equal, which drives accounting for for the constantly improve pulse wave width modulation signal of the on-off cycle controller
Empty ratio.
3. the saturation point measuring device of energy-storage travelling wave tube according to claim 1, which is characterized in that current slope sensing
Device at least senses three and passes through the electric current of the energy-storage travelling wave tube, and measure three electric currents are converted to two current slopes, the electric current
Slope comparator compares two current slope, and when the current slope is unequal, obtains the saturation point.
4. the saturation point measuring device of energy-storage travelling wave tube according to claim 1, which is characterized in that DC power supply output
Voltage be identical to the energy-storage travelling wave tube it is preset operation voltage crest voltage.
5. the saturation point measuring device of energy-storage travelling wave tube according to claim 1, which is characterized in that the arresting element is two
Pole pipe, the current slope sensor include Hall effect current sensor.
6. a kind of saturation point measurement method, suitable for measuring a saturation point of an energy-storage travelling wave tube, which is characterized in that the magnetic is full
Include with measurement method:
(a) one according to the energy-storage travelling wave tube operates voltage and an operating frequency and provides a DC power supply and a pulse wave width modulation
Signal gives the energy-storage travelling wave tube jointly, wherein the pulse wave width modulation signal has the operating frequency, the pulse wave width modulation signal
Duty ratio be gradually increased increase with time；
(b) every predetermined time sensing conducting in the electric current of the energy-storage travelling wave tube, and the multiple electric currents measured are converted to multiple
Current slope；And
(c) more the multiple current slope value, and when adjacent two current slope is unequal, the magnetic for obtaining the energy-storage travelling wave tube is full
And point.
7. saturation point measurement method according to claim 6, which is characterized in that when respectively the current slope is by adjacent two
Between put between current operator and obtain.
8. saturation point measurement method according to claim 6, which is characterized in that further include following steps:
(d) when adjacent two current slope is equal, the duty ratio of the constantly improve pulse wave width modulation signal.
9. saturation point measurement method according to claim 6, which is characterized in that the voltage of DC power supply output is identical
In the crest voltage of the preset operation voltage of the energy-storage travelling wave tube.
10. saturation point measurement method according to claim 6, which is characterized in that the predetermined time is identical to the operation
The single cycle time of frequency.
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