CN105871199B - high voltage power supply - Google Patents
high voltage power supply Download PDFInfo
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- CN105871199B CN105871199B CN201610201997.6A CN201610201997A CN105871199B CN 105871199 B CN105871199 B CN 105871199B CN 201610201997 A CN201610201997 A CN 201610201997A CN 105871199 B CN105871199 B CN 105871199B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
- H02M7/103—Containing passive elements (capacitively coupled) which are ordered in cascade on one source
Abstract
In the high voltage power supply without using transformer, output voltage is suitably adjusted according to the fluctuation of load.The high voltage power supply includes switching device；Voltage resonant circuit, including inductor and capacitor apply a voltage to the voltage resonant circuit by driving switch device；And rectifier circuit, including capacitor and diode, the rectifier circuit is according to the resonance behavior output HIGH voltage of the voltage resonant circuit.The high voltage power supply is switched according to the output from the rectifier circuit and according to the control signal that the output voltage is arranged, and driving frequency is changeably controlled.
Description
The application be the applying date be on December 26th, 2009, application No. is 200980163054.7, entitled " high pressures
The divisional application of the application for a patent for invention of power supply ".
Technical field
The present invention relates to the high voltage power supplies for generating high voltage.
Background technique
Device is formed as a kind of normal image, for example, electronic photographic image forming device includes charging roller and developer roll,
Charging roller is used for the surface charging of the photoconductive drum as image bearing member, and developer roll is used for by using as developer
Toner make to be formed in the latent electrostatic image developing on photoconductive drum.For example, high voltage (direct current of the approximate number hectovolt to thousands of volts
High pressure) need to be applied to the charging roller and the developer roll to photoconductive charging drum and to develop.In order to generate such height
Voltage, using the power supply (hereinafter referred to as high voltage power supply) for being used to generate high voltage using coiling electromagnetic transformers.
For example, being described in PTL 1 using the structure of the high voltage power supply of electromagnetic transformers, desired high voltage can be exported
To load.
It is opposite with the high voltage power supply of this electromagnetic transformers is used, it has been proposed that the ruler of high-voltage power circuit can be reduced
Power circuit of the very little and weight without the use of electromagnetic transformers (see PTL 2).PTL 2 disclose by LC resonance circuit by using
Clock signal as control signal amplifies voltage (24V) voltage output obtained from low-tension supply to including multiple two
The structure of the booster circuit of pole pipe and capacitor.For the structure, transformer is not used.Therefore, high voltage power supply can be smaller
It is lighter.
Quotation list
Patent document
PTL 1: Japanese Patent Laid-Open No.4-352181
PTL 2: Japanese Patent Laid-Open No.2003-189595
Summary of the invention
Technical problem
However, the high voltage power supply that PTL 2 is described has following point.In the high voltage power supply of PTL 2, it is output to load
High-voltage value is predetermined fixed value, and the signal with fixed frequency is used as the LC resonance circuit being input to for output voltage
Control signal.For example, being used as the charging roller of load and developer roll in image forming apparatus can have due to the environment in device
Load caused by abrasion in variation or used charging roller and developer roll changes.If image forming apparatus not basis
This load, which changes to adjust, is output to the voltage of charging roller and developer roll, then can generate such as wherein changed poor quality of darkness
Image.For example, if being difficult to be adjusted according to load variation using the high-voltage power circuit in cited document 2.Cause
This, too high voltages or not afc voltage may be applied to load.
The present invention allows for above-mentioned viewpoint and makes, it is an object of the present invention to provide it is a kind of can be according to load
Change suitably to adjust the high voltage power supply of output voltage.
Solution to the problem
Power supply according to the present invention, for achieving the above object is characterized in that including: switch unit, is believed according to frequency
Number and driven；Voltage resonance unit, is connected to the switch unit and including inductor and capacitor, when the switch unit quilt
Voltage is applied to the inductor when driving；Connection unit connects the switch unit, the inductor and the capacitor；Rectifier list
Member, including being connected to the diode of the connection unit in the supply voltage side of the inductor through capacitor；Voltage output list
Member exports the voltage obtained from the rectifier unit；And frequency control unit, according to for being arranged from the voltage output list
The control signal of the voltage of member output and the frequency that the frequency signal is controlled from the output signal that the voltage output unit exports
Rate.
Advantageous effects of the invention
As described above, according to the present invention, output voltage can change according to load in the high voltage power supply without using transformer
And it is suitably adjusted.
Detailed description of the invention
Fig. 1 is the circuit diagram according to the power supply of embodiment 1.
Fig. 2 is the operation waveform diagram of circuit shown in FIG. 1.
Fig. 3 is another exemplary circuit diagram according to the power supply of embodiment 1.
Fig. 4 includes the operation waveform diagram according to the power supply of embodiment 2.
Fig. 5 is the circuit diagram according to the power supply of embodiment 3.
Fig. 6 includes the operation waveform diagram of circuit shown in fig. 5.
Fig. 7 is the circuit diagram according to the power supply of embodiment 4.
Fig. 8 is the operation waveform diagram of circuit shown in Fig. 7.
Fig. 9 is the circuit diagram according to the power supply of embodiment 5.
Figure 10 shows the frequency characteristic of circuit shown in Fig. 9.
Figure 11 is the operation waveform diagram of circuit shown in Fig. 9.
Figure 12 is the load characteristic figure according to the circuit of embodiment 1.
Figure 13 is the circuit diagram according to the power supply of embodiment 6.
Figure 14 is the circuit diagram according to the power supply of embodiment 7.
Figure 15 is the circuit diagram according to the power supply of embodiment 8.
Figure 16 is the circuit diagram according to the power supply of embodiment 9.
Specific embodiment
Next, the specific structure for being used to solve the above problems of the invention will be described according to the following examples.Note
Meaning, the following examples are only demonstrations, do not imply that technical scope of the invention is limited only to this.
Embodiment 1
Fig. 1 is the power supply electricity for showing the power supply (hereinafter referred to as high voltage power supply) for generating high voltage according to embodiment 1
The figure of line structure.In power circuit shown in Fig. 1, inductor L100 and capacitor C100 constitute voltage resonant circuit.Inductance
Device L100 is attached to switch element and power source voltage Vcc and (is in the present embodiment the element of+24V), and is voltage according to opening
Close the conduction and cut-off of element and the intermittent exemplary elements with inductive component being applied to thereon.Capacitor C100 ground connection.
Constituted and be used as by inductor L100 and the capacitor C100 voltage resonant circuit of voltage resonance unit output pass through it is whole
Levelling current circuit is rectified and is smoothly melted into positive voltage.In rectification smoothing circuit, positive polarity flyback voltage is by allowing electric current
Capacitor C101 along the positive diode D101 passed through and carrying charge is extracted, and capacitor C101 is connected to diode D101
Cathode terminal and power source voltage Vcc.Connection relationship between inductor L100 and diode D101 and capacitor C101 is as follows: two
The anode tap of pole pipe D101 is connected to the connection unit of inductor L100 and the junction capacitor C100；The cathode of diode D101
End is connected to the other end of inductor L100 (in supply voltage side).In addition, multi-stage rectifying device circuit by diode D102,
D103, D104 and D105 and capacitor C102, C103, C104 and C105 are formed.The output of multi-stage rectifying device circuit is through advection
Capacitor C106 ground connection, the waveform of output voltage are smoothed.The output voltage of the multi-stage rectifying device circuit is from as voltage
The output end 104 (Vout) of output unit exports.
In addition, output voltage (Vout) is through voltage sensing resistor R101, voltage grading resistor R102 and R103, protective resistance
Device R104 and suppression condenser C107 is input to the non-inverting input terminal (+end) of operational amplifier Q100.The circuit is
Output voltage detecting circuit.The analog signal (Vcont) of input terminal 103 is input to (for controlling height from controller (not shown)
The control signal of the output voltage of voltage source) through resistor R105 be input to operational amplifier Q100 inverting terminal (-
End).Operational amplifier Q100, resistor R105 and capacitor C108 are used as integrating circuit.That is, according to integral when
Between constant (according to the component constant of capacitor C108 and resistor R105 be arranged) smoothing control signal Vcont be input into
Operational amplifier Q100.In the circuit, the noninvert input of operational amplifier Q100 is input to from output voltage detecting circuit
The feedback voltage at end (+end) is adjusted to be equal to the analog voltage that inverting terminal (- end) is input to from controller.
The output end of operational amplifier Q100 is connected to the voltage controlled oscillator (VCO) 101 as frequency control unit, frequency
Control unit control is used as the driving frequency of the field effect transistor Q101 of switch unit (switch element).The voltage controlled oscillator
101 be the output voltage (Vout) for according to input control signal (Vcont) and being detected and feeding back, and changes and is arranged for controlling
The exemplary oscillator of the frequency of the frequency signal (hereinafter referred to as output signal) of the driving frequency of field effect transistor Q101.This
Outside, it is used as and carrys out the output signal of the frequency signal of voltage controlled oscillator 101 and be input into the gate terminal of field effect transistor Q101.
Field effect transistor Q101 is the illustrative switch element of the pulse output signals driving exported from voltage controlled oscillator 101.?
The drain electrode end of effect transistor Q101 is connected to the voltage resonant circuit that above-mentioned L100 and C100 is constituted.Field effect transistor Q101
Drain electrode end be connected to power source voltage Vcc through inductance L100 and be grounded through capacitor C100.Here, field effect transistor Q101
Source terminal ground connection.
By this method, by be used as voltage resonance unit voltage resonant circuit (voltage resonant circuit by inductor L100 and
Capacitor C100 constitute) amplification voltage be directly used as rectifier unit rectifier circuit rectification.By using multistage whole
It flows device circuit (multiple rectifier circuits are connected to each other), output, which increases, becomes high voltage.Then, by voltage controlled oscillator
(VCO) frequency of output signal is controlled at according to control signal and output voltage, output voltage is adjustable at suitable for load
Condition.
Next, Fig. 2 shows the operation waveforms of units various when power circuit shown in FIG. 1 operates.Here, 2A is indicated
The waveform of the voltage of the grid of field effect transistor Q101 is applied to from voltage controlled oscillator 101 (it is square-wave signal).On the spot
When effect transistor Q101 is connected, electric current flows to inductor L100 from power source voltage Vcc.Then flow through field effect transistor Q101
The waveform of drain current indicated by 2B.That is, energy accumulation is in inductor L100 according to the time span of electric current flowing
In.Next, voltage resonance occurs between capacitor C100 and inductor L100 when field effect transistor Q101 cut-off.
The waveform of the drain voltage of field effect transistor Q101 is indicated by 2C at this time.The voltage that the voltage waveform indicates is commonly referred to as flyback
Voltage.By voltage resonance, if the maximum value V1a of the flyback voltage of resonance circuit is as the voltage value for being power source voltage Vcc
Dry times of voltage value.In addition, voltage can be effectively applied to circuit downstream without by with field effect transistor Q101's
Next turn-on time start from the resonance potential become 0V or the mode of more hour that deadline is arranged is so-called hard to carry out
Part switch.The voltage that the resonance circuit generates increases amount corresponding with the series of downstream stage of multi-stage rectifying device circuit.It is arranged in
The voltage waveform of the anode tap of diode D105 at the afterbody of rectifier circuit is indicated by 2D.The voltage waveform has most
Big voltage value V1b and the voltage value being superimposed on it with flyback voltage V1a.In addition, the voltage of the cathode terminal of diode D105
It is constant voltage V1b, at output end 104 (Vout), diode D105 is smoothed and stabilized by using smoothing capacitor 106
Cathode terminal voltage and the voltage waveform that there is 2E to indicate for the voltage that obtains.
Next, the operation of rectification smoothing circuit will be described in detail.When field effect transistor Q101 cut-off, including inductance
The positive polarity flyback voltage that the resonance circuit of device L100 and capacitor C100 generate is used to give capacitor C101 through diode D101
Charging.As a result, maximum voltage Vmax1 is maintained.Diode D101 and capacitor C101 is used as the first order of rectifier circuit.
Here, by the way that capacitor C101 to be connected to the cathode terminal and supply voltage of first order diode, there is the crest voltage of the first order
Stabilized effect can be obtained in waveform.Next, generating anti-electricity by inductor L100 when field effect transistor Q101 conducting
EMF voltage.At this point, charge is moved to capacitor C102 through diode D102, capacitor C102 is electrically charged.As a result, flyback voltage
Vmax1 is applied to basis of the capacitor C102 as the maximum voltage Vmax1 at capacitor C101, maximum voltage Vmax1 amplification
At maximum voltage Vmax2 (Vmax1 × 2 ≈).Diode D102 and capacitor C102 is used as the second level of rectifier circuit.This
Outside, it is moved to when the charge scene effect transistor Q101 cut-off being stored in due to charging in capacitor 102 through diode 103
Capacitor C103, capacitor C103 are electrically charged.As a result, maximum voltage Vmax3 (Vmax1 × 3 ≈) is maintained at capacitor C103.
Later, by the way that flyback voltage is repeatedly increased to holding voltage, repeatedly (number is equal to and capacitor C104 and diode D104
And the relevant rectifier circuit series of capacitor C105 and diode D105), voltage is similarly amplified.Here, work as voltage
When being amplified, the loss due to caused by the performance of each capacitor and diode is generated.Therefore, the flyback voltage of resonance circuit
Amplification factor cannot be rectifier circuit series.However, it is possible to by being considered in advance due to each capacitor and diode
Performance caused by loss come obtain target voltage output.At the connection unit that diode D105 is connected to capacitor C105
The voltage of generation is smoothed and exported from output end 104 (Vout) as burning voltage by smoothing capacitor C106.Here, in reality
It applies in example 1, control carries out in this way: the frequency of output signal can change；However, the duty ratio of frequency is (when conducting
Between ratio between deadline) be arranged to fixed value.As described above, setting is opened with field effect transistor Q101 without hardware
The mode of pass is arranged.
Here, Figure 12 shows the load characteristic of typical circuit according to this embodiment.Load characteristic shown in Figure 12 be
Supply voltage is 24V, L=220 μ H, the C=330pH of resonance circuit, and the C=330pH's of rectifier circuit of resonance circuit
In the case of characteristic.It will wherein be carried out using specific value using the case where there is 100M Ω or higher high-resistance load
Description.When frequency f is 160kHz, the crest voltage of the flyback voltage of voltage resonant circuit is about 180V.Work as rectifier circuit
It is the high voltage of the about three times of the crest voltage when with level Four, i.e., about 540V is exported.In addition, when rectifier circuit has
It is about six times of high voltages of the crest voltage at ten grades, i.e., about 1080V is exported.In addition, output voltage can pass through basis
It inputs the flyback voltage of frequency shift resonance circuit and is controlled.For example, in the case where the series of rectifier circuit is four,
If frequency f is 300kHz (being multiplied by twice), output voltage reduces about half.It by this method, can relative to supply voltage
To generate sufficiently high voltage.In addition, output voltage can easily according to the series of rectifier circuit and control signal and
Output voltage is adjusted, and output voltage can be adjusted to have value appropriate according to load variation.
Above embodiments illustrate the circuit structure for the high voltage power supply that can export positive voltage and circuit operations, and illustrate to grasp
Voltage and current waveform when carrying out.Here, the circuit structure that can export the high voltage power supply of negative high-voltage can be for example, by
Circuit shown in Fig. 3 is realized.In Fig. 3, the diode of rectifier circuit is connected to each other in this way: with it is shown in FIG. 1
The circuit structure that positive voltage can be exported is compared, and the polarity of diode is opposite.In addition to this, output voltage detecting circuit and voltage-controlled
Oscillator 101 should also have circuit constant corresponding with negative high-voltage and specification.In addition, there are many grades in rectifier circuit
In the case of, compared with the case where exporting positive voltage, need to invert the polarity of whole diodes.This by comparing Fig. 1 and Fig. 3 but
Clearly, because diode D101, D102, D103, D104 and D105 are inverted.It, can be with using the above structure of power circuit
The stabilization high voltage with negative polarity is generated at output end 104 (Vout).
Here, the target that above-mentioned electronic photographic image forming device high voltage appearance is applied to may be used as retouching in the embodiment
The output for the high voltage power supply stated is by the example for the load being provided to.For example, carrying structure to as image in laser beam printer
The charger unit (charging roller) of the photoconductive charging drum of part, development are formed in the electrostatic latent image on photoconductive drum due to exposure
Developer unit (developer roll), will be developed in photoconductive drum on image be transferred on recording materials transfer unit (transfer
Roller) etc. may be used as loading.Moreover, other than image forming apparatus, need high voltage and its condition according to environmental change and
The load of change can also apply.
As described above, according to this embodiment, in the high voltage power supply without using transformer, output voltage can be according to load
Change and is suitably adjusted.
Embodiment 2
Next, by operation waveform description according to Fig.4, according to the high voltage power supply of embodiment 2.Here, about with root
It will be omitted according to the description of the identical part of the circuit of the high voltage power supply of embodiment 1.Fig. 1 is similar to according to the circuit of embodiment 2
Shown according to the circuit of embodiment 1.However, the method for the control output voltage of embodiment 2 is different from the method for embodiment 1.
Output voltage is controlled in this way in the method for the control output voltage that embodiment 2 uses: being input to field effect transistor
The deadline (the toff time in Fig. 4) of the control signal of the gate terminal of pipe Q101 is set as fixed value, only controls signal
Turn-on time (the ton time in Fig. 4) can change.
Similar to Example 1, Fig. 4 shows the operation waveform of the various units of circuit shown in FIG. 1, which is according to reality
Apply the operation waveform of example 2.Figure (part b of Fig. 4) when figure (part a of Fig. 4) and output high pressure when exporting low pressure is separated
Figure.Firstly, 4A and 4E indicates the wave for being applied to the voltage of the gate terminal of field effect transistor Q101 from voltage controlled oscillator 101
Shape.When field effect transistor Q101 conducting, electric current flows to inductor L100 from power source voltage Vcc.Then flow through field-effect crystalline substance
The waveform of the drain current of body pipe Q101 is indicated by 4B and 4F.That is, energy accumulation is in electricity according to the time of electric current flowing
In sensor L100.Next, voltage resonance occurs in capacitor C100 and inductor when field effect transistor Q101 cut-off
Between L100.The waveform of the drain voltage of field effect transistor Q101 is indicated by 4C and 4G at this time.Voltage one with the waveform
As be known as flyback voltage.It is power supply that voltage resonance, which becomes the maximum value V2a (4C) and V2c (4G) of the flyback voltage of resonance circuit,
The voltage value of the several times of voltage vcc.Voltage can be effectively applied to downstream stage circuit without by the way that field-effect is brilliant
It is 0V or more hour to carry out hardware switch that next turn-on time of body pipe Q101, which is set on and starts from the resonance potential,.This is humorous
The voltage that circuit generates that shakes increases amount corresponding with the series of the downstream stage of rectifier circuit.By utilizing smoothing capacitor C106
The voltage waveform waveform obtained that smoothing and stabilisation are exported from rectifier circuit is 4D and 4H expression in output end 104
(Vout) voltage waveform at.Voltage V2b (4D) and V2d (4H) are exported.
Next, description is worked as control to be input to the gate terminal of field effect transistor Q101 from voltage controlled oscillator 101
The operation that the mode that the frequency of control signal can be changed is carried out when carrying out.In the output voltage control based on frequency,
Output voltage can be with the frequencies go lower when desired output voltage is higher and the side that frequency is got higher when desired output voltage is lower
Formula is controlled.More specifically, when frequencies go lower, as the turn-on time ton of field effect transistor Q101 is elongated, more
Energy storage is in inductor L100.As a result, the maximum value of the flyback voltage waveform of resonance circuit also becomes larger.That is, from
The voltage that output end 104 exports is got higher.On the contrary, when frequency is got higher, as the turn-on time ton of field effect transistor Q101 becomes
Short, less energy storage is in inductor L100.As a result, the maximum value of the flyback voltage waveform of resonance circuit also becomes smaller.Also
It is to say, the voltage exported from output end 104 is lower.By this method, output voltage can be controlled by changing frequency.
About the operation, when the duty ratio (ratio of the turn-on time to deadline) in control signal is set as fixed value
When state lower frequency is got higher, the turn-on time ton and deadline toff of field effect transistor Q101 similarly shortens.Work as conducting
When time ton and deadline toff similarly shortens and frequency gets higher some value, Q101 is connected and field effect transistor
The drain voltage of Q101 has potential.That is, field effect transistor Q101 is carried out caused by hardware switch and switch operation
Loss becomes larger.As described above, when carry out hardware switch and when high drain voltage, in Q101 conducting electric current drain electrode and source electrode it
Between flow, lead to bigger loss.
Therefore, in example 2, as shown in figure 4, control carries out in this way: generating flyback voltage during it
Deadline toff be set as fixed value, control signal is connected after flyback voltage drops to 0V or lower, and is only connected
Time, ton can change.Here, it is longer than deadline toff humorous according to the voltage of inductor L100 and capacitor C100 composition
The time width of the flyback voltage waveform of the resonance frequency setting of vibration circuit.In addition, for exporting turn-on time when low-voltage
Relationship control between ton1 and turn-on time ton2 when for output HIGH voltage is ton1 < ton2.
Here, even if (wherein controlling can be by setting the duty ratio for controlling signal with frequency for method described in embodiment 1
The mode for being set to fixed value to change carries out) side that can also be changed in frequency range without requiring hardware switch with frequency
Formula is controlled；However, embodiment 2 is in the case where the frequency range for carrying out control and frequency can change is contemplated to be wider range
It is effective.
As described above, according to this embodiment, output voltage can be according to load in the high voltage power supply without using transformer
Change and obtain adjusting appropriate, and the progress of hardware switch can also be prevented, circuit loss can reduce, and stable high voltage can
With output.
Embodiment 3
Next, embodiment 3 will be described referring to figure 5 and figure 6.Note that about with the electricity according to the high voltage power supply of embodiment 1
The description of the identical part in road will be omitted.Not according to the circuit of the high voltage power supply of embodiment 3 and according to the circuit of embodiment 1
It is with place, in the method for the control output voltage that embodiment 3 uses, output voltage passes through to supply other than frequency controls
It is controlled and is changed to the mode that voltage can also change.
Firstly, will be structurally and operationally described referring to Fig. 5 according to the circuit of embodiment 3.From controller (not shown)
The analog signal (the control signal (Vin) for high voltage power supply) for being input to input terminal 105 is input to operation through resistor R106
The inverting terminal (- end) of amplifier Q100.Operational amplifier Q100, resistor R106 and capacitor C109 are used as integrator
Circuit.That is, (being arranged according to the component constant of capacitor C109 and resistor R106) according to integration time constant
The control signal Vin of smoothing is input into operational amplifier Q100.On the other hand, the output electricity generated at output end 104
Pressure is through constituting voltage sensing resistor R101, the voltage grading resistor R102 and R103, protective resistor of output voltage detection device
R104 and suppression condenser C107 is input to the non-inverting input terminal (+end) of operational amplifier Q100.It will be from output electricity
The feedback voltage that pressure detection device is input to the non-inverting input terminal (+end) of operational amplifier Q100 is adjusted to be equal to from control
Device is input to the analog voltage at inverting terminal (- end).
The output voltage of operational amplifier Q100 makes the potential change of the base stage of transistor Q102 through resistor R107.This
Outside, the potential between the base stage and emitter by the way that the potential of the base stage of transistor Q102 to be reduced to transistor Q102 is obtained
Voltage is applied to the voltage of inductor L100.Here, capacitor C111 is connected to stabilize and will be applied to inductor
The service voltage of L100, and diode D106 is connected to protect transistor Q102.The inductor will be applied to as changing
The structure of the circuit of the voltage change unit of the voltage of L100 is the feature of the present embodiment 3.
In addition, control frequency is input to the gate terminal of field effect transistor Q101 from frequency input 106 (Vclk).The control
The duty ratio of frequency processed can be set to fixed value or can change as described in Example 2 with duty ratio
Mode is arranged.In the present embodiment 3, by prevent field effect transistor Q101 carry out hard switching in a manner of preset frequency from
Controller (not shown) as control signal input, is controlled through frequency input 106 (Vclk) will be applied to inductor
The mode that the supply voltage of L100 can change carries out obtaining desired output voltage.In the present embodiment 3, signal is controlled
(its frequency can change) inputs from controller；However, control can be as described in Example 1 to control signal
The mode changed by using voltage controlled oscillator (VCO) is carried out.
Fig. 6 shows the operation waveform of the various units of circuit shown in fig. 5 and including following figure: when for exporting low-voltage
Figure (the part a) of Fig. 6 and figure (the part b) of Fig. 6 when for output HIGH voltage.Firstly, 6A and 6F is indicated from voltage controlled oscillation
Device 101 is applied to the waveform of the voltage of the grid of field effect transistor Q101.For exporting deadline toff3 when low-voltage
The relationship between deadline toff4 when with for output HIGH voltage is toff3 < toff4, leading when for exporting low-voltage
Relationship between logical time ton3 and turn-on time ton4 when for output HIGH voltage is ton3 < ton4.Here, it is similar to real
Example 1 is applied, duty ratio is set as fixed value.In addition, 6B and 6G indicates to change dress by the supply voltage of the feature as embodiment 3
Set the voltage for being applied to inductor L100.Confession when for supply voltage V3a when exporting low-voltage with for output HIGH voltage
Answering the relationship between voltage V3d is V3a < V3d.
Next, electric current flows to inductor L100 from power source voltage Vcc when field effect transistor Q101 conducting.At this time
The waveform for flowing through the drain current of field effect transistor Q101 is indicated by 6C and 6H.Drain current changes according to supply voltage.
Next, voltage resonance occurs between capacitor C100 and inductor L100 when field effect transistor Q101 cut-off.At this time
The waveform of the drain voltage of field effect transistor Q101 is indicated by 6D and 6I.The drain voltage is according to supply voltage and drain current
And change.Here, for above-mentioned deadline toff3 when exporting low-voltage with next conducting of field effect transistor Q101
Mode when resonance potential is 0V or lower is started to be arranged.As a result, voltage can be effectively applied to the circuit of downstream stage without
Carry out hardware switch.
Increase amount corresponding with the series of the downstream stage of rectifier circuit by the flyback voltage that resonance circuit generates.Pass through
Being smoothed and stabilized using smoothing capacitor C106 from the voltage waveform voltage waveform obtained that rectifier circuit exports is
The voltage waveform at output end 104 (Vout) that 6E and 6J is indicated.Supply voltage V3c when for exporting low-voltage be used for
The relationship between supply voltage V3f when output HIGH voltage is V3c < V3f.
As described above, can be become according to load according to the present embodiment without using output voltage in the high voltage power supply of transformer
Change and obtain adjusting appropriate, the voltage range furthermore controlled can be by the way that voltage can change and frequency can also to supply
The mode of change is controlled and wider.Here, in the present embodiment 3, although it have been described that control can be with to supply voltage
Change and frequency also changeable mode carries out, but wherein output voltage by by set of frequency at fixed value and to supply electricity
The method for pressing the mode that can change to be controlled to be controlled is also effective.
Embodiment 4
Next, the embodiment of the present invention 4 will be described referring to Fig. 7 and 8.Note that about with the high-voltage electricity according to embodiment 1
The description of the identical part of the circuit in source will be omitted.The present embodiment 4 and above-described embodiment 1 the difference is that, such as Fig. 7
Shown in circuit, inductor L101, which connects, is plugged on the company of the inductor L100 and capacitor C100 that connect and compose voltage resonant circuit
Between order member and rectifier circuit, and current resonance circuit utilizes the diode of downstream stage and the capacitance characteristic shape of capacitor
At.
Fig. 8 shows the operation waveform of various units shown in Fig. 7.Here, 8A expression is applied to field effect transistor Q101
Gate terminal voltage.Indicate that the waveform for the drain current for flowing through field effect transistor Q101 is indicated by 8B.Field effect transistor
The waveform of the drain voltage of Q101 is indicated by 8C.It is power source voltage Vcc that voltage resonance, which is amplified to the maximum value V4a of flyback voltage,
Several times voltage value.The waveform for flowing through the electric current of inductor L101 is indicated by 8D.Here, the current waveform is with the normal of circuit
It counts and changes.The current amplitude I4a of sine wave with constant frequency is superimposed upon on the electric current for flowing through inductor L101.This is root
According to the frequency component of the constant setting of the capacitance characteristic and inductor L101 of the downstream stage of rectifier circuit.The capacitor of diode is special
Property is generally lower, therefore resonance frequency is got higher.It is indicated in the voltage of the outlet side of inductor L101 by 8E, the maximum value of voltage
V4b is almost the same with the maximum value V4a of above-mentioned flyback voltage.However, voltage waveform is changed by passing through inductor L101, and
The virtual value of flyback voltage increases.In addition, voltage amplitude V4c is had in the region that flyback voltage is 0V by what is generated in the part 8E
The current amplitude of high frequency is superimposed.By the circuit operation, flyback voltage becomes have such voltage waveform (on fundamental sine wave
Voltage waveform), the voltage waveform have higher virtual value.Diode at the afterbody for being arranged in rectifier circuit
The waveform of voltage at the anode tap of D105 is indicated by 8F.The voltage waveform has maximum voltage value V4d, the voltage of above-mentioned amplitude
V4b is ideally superimposed upon on voltage waveform.In addition, the voltage in the cathode terminal of diode D105 is constant voltage V4d.It is exporting
It is indicated by smoothing capacitor C106 smoothing and stabilized voltage waveform by 8G at 104 (Vout) of end.
As described above, output voltage can be according to load in the high voltage power supply without using transformer according to the present embodiment
Change and obtain adjusting appropriate, and the virtual value of flyback voltage can increase.Thus, it is possible to obtain higher output power.
Embodiment 5
Next, embodiment 5 will be described referring to Fig. 9,10 and 11.Note that about with according to the high voltage power supply of embodiment 1
The description of the identical part of circuit will be omitted.The present embodiment 5 and above-described embodiment 1 the difference is that, with embodiment 1
The voltage resonant circuit that wherein inductor and capacitor are connected in parallel is different, by the way that the base stage of NPN transistor Q102 to be connected to
The base stage of PNP transistor Q103 and the emitter of NPN transistor Q102 is connected to the emitter of PNP transistor Q103 to construct
Push-pull type current amplifier circuit, NPN transistor Q102 and PNP transistor Q103 are used as switch unit (switch element).In addition,
Capacitor C110 is plugged between the output unit of current amplifier circuit and rectifier circuit and inductor L110 and resistor
R110 is connected in series to ground connection, to constitute LCR series resonant circuit.In the present embodiment 5, capacitor C110, inductance are used
The circuit of device L110 and resistor R110 are shown as the example of current resonance circuit.
The frequency characteristic of the current resonance circuit is shown in Figure 10.Gain (dB) reaches maximum value at resonance frequency f0,
F0 is arranged according to the constant of inductor L110 and the constant of capacitor C110.Furthermore, it is therefore clear that the circuit has the spy of high Q
Property.It is more preferably controlled to realize, it may be desirable to plant resistor R110 to optimize the Q of circuit.Therefore, the output performance of circuit
It can be improved near resonance frequency f0 by the way that set of frequency will be controlled.
Figure 11 shows the operation waveform of the various units of circuit shown in Fig. 9.Here, 11A expression is applied to NPN transistor
The base voltage of the gate terminal of both Q102 and PNP transistor Q103, gate terminal are connected to each other.In NPN transistor Q102 and PNP
The emitter voltage of the emitter terminal of both transistor Q103 is indicated that emitter terminal is connected to each other by 11B.Due to foring electric current
Amplifier circuit, so gate terminal and emitter terminal have essentially identical voltage.Flow through the waveform of the electric current of capacitor C110
It is indicated by 11C.The phase of the current waveform be gate terminal obtains and by 11A expression voltage waveform phase before 45
Degree.Voltage at the connection unit of the capacitor C110 and inductor L110 that connect and compose current resonance circuit indicates by 11D,
The voltage is transformed into the sine wave with amplitude voltage V5a by current resonance circuit.The phase of the voltage waveform is in gate terminal
45 degree behind the phase of voltage waveform obtaining and by 11A expression, and in the current waveform of the 11C capacitor C110 indicated
90 degree behind phase.The voltage waveform of the anode tap of diode D105 at the afterbody for being arranged in rectifier circuit by
11E is indicated.There is the voltage waveform maximum voltage value V5b, above-mentioned amplitude voltage V5a to be ideally superimposed upon on the voltage waveform.
In addition, the voltage in the cathode terminal of diode D105 is constant voltage V5b.Pass through advection capacitor at output end 104 (Vout)
Device C106 smoothing and stabilized voltage waveform are indicated by 11F.
As described above, according to this embodiment, Current amplifier is carried out by push-pull type current resonance circuit and is controlled in resonance
Frequency f0 is nearby carried out to utilize the characteristic with high-gain of current resonance circuit.In addition, in the high pressure for not using transformer
In power supply, by carrying out voltage amplification by multi-stage rectifying device circuit, output voltage can obtain tune appropriate according to load variation
Section, and higher voltage power can be obtained.It is amenable in addition, also having to be without the use of according to the circuit structure of the present embodiment 5
The advantages of transistor of high voltage, because Current amplifier is carried out using the supply voltage of original sample.
Embodiment 6
Next, by referring to Fig.1 3 descriptions according to the high voltage power supply of the present embodiment 6.Note that about with according to embodiment 1
The description of the identical part of the circuit of high voltage power supply will be omitted.The present embodiment 6 and above-described embodiment 1 the difference is that,
There are the first output voltage (Vout1) and two channels of the second output voltage (Vout2) according to the circuit of the present embodiment.In addition,
The present embodiment is further characterized in that the first output voltage is obtained from the afterbody for the rectifier circuit for being used as rectifier unit,
Second output voltage is obtained from the upstream portion relative to its afterbody of rectifier circuit.For example, when rectifier circuit has
When having two-stage, the voltage (Vout1) exported from first voltage output unit is to be used as the second rectifier from rectifier circuit
The output of the second level (it is afterbody) of unit, the voltage (Vout2) exported from second voltage output unit are from whole
Flow the output of the first order as the first rectifier unit of device circuit.
3 circuit structure and operation will be described referring to Fig.1.As described in Example 1, according to rectifier circuit
Ideal operation, can obtain be flyback voltage Vmax n times of DC output (n is integer).More specifically, it is twice of Vmax
Output can be obtained in the cathode side of D103 shown in Figure 13.Here, if it is n times of output electricity shown in Figure 13 of Vmax
The cathode side of the D105 on road obtains, that is to say, that if rectifier circuit has the knot for wherein exporting that Vout1 is n or Vmax × n
Structure, then exporting Vout2 is Vmax (n -1) times.Therefore, the two free voltages output indicated as follows can be shown in Figure 13
Circuit obtains.
Vout1=n × Vmax (equation 1)
Vout2=(n -1) × Vmax (equation 2)
(n is integer)
In addition, circuit structure is simply inexpensive, wherein only C112 is used as the part for electric field to be output to Vout.Here,
The case where there are two the channels for being used for output voltage has been described in the present embodiment 6, but is used for the channel of output voltage
Number is not limited to two.Circuit structure can have three or more channels.In this case, each of many output voltages
It should be obtained from the correspondence level-one in rectifier stage.
As described above, output voltage can be according to load in the high voltage power supply without using transformer according to the present embodiment
Change and be suitably adjusted, and multiple high voltage outputs can be obtained.
Embodiment 7
Next, by referring to Fig.1 4 descriptions according to the high voltage power supply of embodiment 7.Note that about with the height according to embodiment 1
The description of the identical part of the circuit of voltage source will be omitted.Difference between the embodiment 7 and above-described embodiment 6 will be below
Description.
In being described in embodiment 6 and in the circuit that is shown in Figure 13, as represented by equation 2, output voltage
Vout2 is only capable of n times of the value that acquisition is the maximum peak voltage Vmax of flyback voltage.In the present embodiment 7 shown in Figure 14, point
Piezoresistance device circuit is applied so that obtaining the free voltage except n times of voltage.
The circuit structure of the present embodiment 7 and operation will be described using Figure 14.It is n times of the voltage output of Vmax in Figure 14
Shown in circuit D105 cathode side obtain.That is, working as rectifier circuit with wherein output Vout1 is n × Vmax
Structure when, be Vmax (n -1) times in the voltage of the cathode side of D105.So, output Vout2 is by with resistor R108
The voltage voltage obtained that will be obtained in the anode-side of D104 with R109.The Vout2 be (R109/R108+R109) ×
(n–1)×Vmax.That is, two can be obtained as represented by following equation in the circuit shown in Figure 14
Meaning voltage output.
Vout2=(R109/R108+R109) × (n -1) × Vmax (equation 3)
In addition, the circuit for exporting free voltage Vout2 (it is not the integral multiple of Vmax) has simple inexpensive packet
Include the circuit structure of R108, R109 and C112.Here, output voltage channel there are two being had been described in the present embodiment 7
Situation, but the quantity in output voltage channel is not limited to two.Circuit structure can have three or more channels.In the situation
Under, each of many output voltages should be obtained from the correspondence level-one in rectifier stage.
As described above, output voltage can be according to load in the high voltage power supply without using transformer according to the present embodiment
Change and be suitably adjusted, and multiple high voltage outputs can be obtained.
Embodiment 8
Next, 5 embodiment 8 will be described referring to Fig.1.Note that about with the circuit phase according to the high voltage power supply of embodiment 1
The description of same part will be omitted.Difference between embodiment 8 and above-described embodiment 7 will be described below.
In being described in embodiment 7 and it is shown in the circuit in Figure 14, as represented by equation 3, output electricity
Pressure Vout2 is the result as the resistor divider for using R108 and R109 and the free voltage obtained.The feature of the present embodiment 8
It is, free voltage is obtained by using the Zener diode D106 as constant voltage elements.
Circuit structure and operation 5 will be described referring to Fig.1.It is in the cathode side of the D105 of circuit shown in figure 15
N times of the voltage output of Vmax.That is, when rectifier circuit have wherein voltage output Vout1 be n × Vmax structure
When, it is Vmax (n -1) times in the voltage of the anode-side of D104.Exporting Vout2 is the voltage obtained from the anode-side in D104
The Zener voltage Vz value obtained of Zener diode D106 is subtracted, therefore Vout2 is (n -1) × Vmax-Vz.That is,
In circuit shown in figure 15, two free voltage outputs can be obtained as shown below.
Vout2=(n -1) × Vmax-Vz (equation 4)
In addition, for export not be Vmax integral multiple free voltage Vout2 circuit have include D106, C112 and
The simple inexpensive circuit structure of R110.
Here, the R110 in Figure 15 is used to guarantee the Zener voltage of D105.If the load connected can guarantee Zener
Voltage, then R110 can be omitted.Here, the case where wherein there are two output voltage channel, to have been described in the present embodiment 8, but
It is the not limited in output voltage channel in two.Circuit structure can have three or more channels.In this case, multiple
Each of output voltage should be obtained from the correspondence level-one in rectifier stage.In addition, Zener diode is used as in the present embodiment 8
Constant voltage elements；However, rheostat can be used as.
As described above, output voltage can be according to load in the high voltage power supply without using transformer according to the present embodiment
Change and be suitably adjusted, and multiple high voltage outputs can be obtained.
Embodiment 9
Next, by referring to Fig.1 6 descriptions according to the power supply of embodiment 9.Note that about with the high-voltage electricity according to embodiment 1
The description of the identical part of the circuit in source will be omitted.Difference between the present embodiment 9 and above-described embodiment 8 will retouch below
It states.
In being described in embodiment 8 and in the circuit that is shown in Figure 15, the anti-of operational amplifier Q100 will be fed back to
Feedthrough voltage is obtained from Vout1 to compensate output voltage fluctuation.However, the present embodiment 9 obtains feedback voltage from Vout2.It adopts
With the structure, the withstanding voltage of component used in feedback voltage channel can be lower.More specifically, the withstanding voltage of R111
Can it is lower and be able to achieve cost reduction.
In addition, being similar to the present embodiment 9, cost reduction can be by obtaining from Vout2 in the circuit shown in Figure 13 and 14
Feedback voltage is obtained to realize.Here, the case where wherein there are two output voltage channel, to have been described in the present embodiment 9, still
The quantity in output voltage channel is not limited to two.Circuit structure can have three or more channels.In this case, multiple defeated
Each of voltage should be obtained from the correspondence level-one in rectifier stage out.
As described above, output voltage can be according to load in the high voltage power supply without using transformer according to the present embodiment
Change and be suitably adjusted, and multiple high voltage outputs can be obtained.
Reference signs list
L100 inductor
Q101 field effect transistor
C100, C101, C102, C103, C104, C105 capacitor
D101, D102, D103, D104, D105 diode
Claims (9)
1. a kind of high voltage power supply, characterized by comprising:
Resonant element comprising inductor；
The switch element connecting with the inductor, the switch element are configured as driving the resonant element；
Voltage amplification unit is connected and configured to the voltage amplification that will be generated in the inductor with the resonant element
And enlarged voltage is exported, voltage amplification unit is connected to the inductor and includes multiple rectification units, described more
A rectification unit respectively contains capacitor and diode；And
Control unit, in order to control from the voltage amplification unit to the voltage of load output as target value, control unit root
According to the control signal for the voltage to export from voltage amplification unit to be arranged and the voltage control exported from voltage amplification unit
For driving the frequency of the driving signal of the switch element, so that the frequency of the driving signal is close to the resonant element
Resonance frequency.
2. high voltage power supply as described in claim 1,
Wherein, driving signal is square-wave signal, and
Wherein, described control unit controls the voltage exported from voltage amplification unit by changing the turn-on time of rectangular wave.
3. high voltage power supply as claimed in claim 1 or 2 further includes voltage altering device, voltage altering device is for changing warp
The voltage of the switch element is applied to by the inductor,
Wherein, voltage altering device is applied to the voltage of switch element by change to change the electricity exported from voltage amplification unit
Pressure.
4. high voltage power supply as claimed in claim 1 or 2,
Wherein, the resonant element includes the capacitor connecting with one end of the inductor, and
Wherein, another inductor different from the inductor is connected to the capacitor and voltage amplification unit of the resonant element
Between.
5. high voltage power supply as described in claim 1, wherein the switch element includes field effect transistor.
6. high voltage power supply as described in claim 1,
Wherein, voltage amplification unit includes first voltage output unit and second voltage output unit, and
Wherein, the voltage exported from first voltage output unit is different from the voltage exported from second voltage output unit.
7. high voltage power supply as described in claim 1, wherein the multiple rectification unit formation multi-stage rectifying device circuit, first
One end of the first capacitor device of grade rectifier circuit is connected to one end of the inductor, and the other end of first capacitor device is connected to
The cathode of first diode, and the anode of first diode is connected to the other end of the inductor；Second level rectifier electricity
One end of second capacitor on road is connected to the cathode of the second diode, and the other end of the second capacitor is connected to first diode
Anode, the anode of the second diode is connected to the cathode of first diode；One end of the third capacitor of third level rectifier
It is connected to the anode of the second diode, the other end of third capacitor is connected to the cathode of third diode, and the three or two pole
The anode of pipe is connected to the cathode of the second diode, and so on, rather than every level-one in multi-stage rectifying device circuit all connects
To two lines.
8. a kind of image forming apparatus, characterized by comprising:
Image forming unit, for forming image on image bearing member；With
High voltage power supply is configured as applying high voltage to image forming unit, and high voltage power supply includes:
Resonant element comprising inductor；
The switch element connecting with the resonant element, the switch element are configured as driving the inductor；
Voltage amplification unit is connected and configured to the voltage amplification that will be generated in the inductor with the resonant element
And enlarged voltage is exported, voltage amplification unit is connected to the inductor and includes multiple rectification units, described more
A rectification unit respectively contains capacitor and diode, and
Control unit, in order to control from the voltage amplification unit to the voltage of load output as target value, control unit root
According to the control signal for the voltage to export from voltage amplification unit to be arranged and the voltage control exported from voltage amplification unit
For driving the frequency of the driving signal of the switch element, so that the frequency of the driving signal is close to the resonant element
Resonance frequency.
9. image forming apparatus as claimed in claim 8, wherein it includes any in following item that described image, which forms unit,
: the charhing unit for charging to image bearing member, image development for that will be formed on image bearing member it is aobvious
Shadow unit, and the transfer unit for being transferred to the image being formed on image bearing member on recording materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201997.6A CN105871199B (en) | 2009-12-26 | 2009-12-26 | high voltage power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610201997.6A CN105871199B (en) | 2009-12-26 | 2009-12-26 | high voltage power supply |
| CN200980163054.7A CN102656786B (en) | 2009-12-26 | 2009-12-26 | High voltage source |
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| CN200980163054.7A Division CN102656786B (en) | 2009-12-26 | 2009-12-26 | High voltage source |
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| CN105871199B true CN105871199B (en) | 2019-01-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5572414A (en) * | 1993-10-04 | 1996-11-05 | Oki Electric Industry Co., Ltd. | High voltage power supply circuit |
| CN1329388A (en) * | 2000-06-12 | 2002-01-02 | 索尼株式会社 | Comprehensive resonance DC-DC frequency converter and high voltage generating circuit in multiple frequency area excitation |
| CN1750376A (en) * | 2004-09-17 | 2006-03-22 | 索尼株式会社 | Switching power supply circuit |
| CN200968938Y (en) * | 2006-11-08 | 2007-10-31 | 中国科学院沈阳科学仪器研制中心有限公司 | Electrical source of electron gun for reflected high energy electron diffraction instrument |
-
2009
- 2009-12-26 CN CN201610201997.6A patent/CN105871199B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5572414A (en) * | 1993-10-04 | 1996-11-05 | Oki Electric Industry Co., Ltd. | High voltage power supply circuit |
| CN1329388A (en) * | 2000-06-12 | 2002-01-02 | 索尼株式会社 | Comprehensive resonance DC-DC frequency converter and high voltage generating circuit in multiple frequency area excitation |
| CN1750376A (en) * | 2004-09-17 | 2006-03-22 | 索尼株式会社 | Switching power supply circuit |
| CN200968938Y (en) * | 2006-11-08 | 2007-10-31 | 中国科学院沈阳科学仪器研制中心有限公司 | Electrical source of electron gun for reflected high energy electron diffraction instrument |
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