CN105871199A - High-voltage power supply - Google Patents
High-voltage power supply Download PDFInfo
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- CN105871199A CN105871199A CN201610201997.6A CN201610201997A CN105871199A CN 105871199 A CN105871199 A CN 105871199A CN 201610201997 A CN201610201997 A CN 201610201997A CN 105871199 A CN105871199 A CN 105871199A
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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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
In a high-voltage power supply which does not utilize a transformer, an output voltage is properly adjusted according to load fluctuation. The high-voltage power supply comprises a switching device, a voltage resonance circuit and a rectifier circuit, wherein the voltage resonance circuit comprises an inductor and a capacitor; the voltage is applied to the voltage resonance circuit by driving the switching device; the rectifier circuit comprises capacitors and diodes; and the rectifier circuit outputs a high voltage according to the resonance behavior of the voltage resonance circuit. The high-voltage power supply is turned on or off according to output from the rectifier circuit and a control signal of setting the output voltage; and the drive frequency is changeably controlled.
Description
The application be filing date December in 2009 26 days, Application No. 200980163054.7,
The divisional application of the application for a patent for invention of invention entitled " high voltage power supply ".
Technical field
The present invention relates to produce high-tension high voltage power supply.
Background technology
Forming device as a kind of normal image, such as, electronic photographic image forming device includes
Charging roller and developer roll, charging roller is for giving the surface of the photoconductive drum as image bearing member
Charging, developer roll is for by using the toner as developing agent to make to be formed at photoconductive drum
On latent electrostatic image developing.Such as, the high voltage (high direct voltage) of approximate number hectovolt extremely thousands of volts
Need to be applied to this charging roller and this developer roll with to photoconductive charging drum with develop.In order to
Generate such high voltage, have employed and use the high-tension for producing of coiling electromagnetic transformers
Power supply (hereinafter referred to as high voltage power supply).
Such as, the structure using the high voltage power supply of electromagnetic transformers is described in PTL 1, it is desirable to
High voltage can export load.
Contrary with the high voltage power supply using this electromagnetic transformers, it has been proposed that height can be reduced
Size and the weight of voltage source circuit and do not use the power circuit of electromagnetic transformers (see PTL
2).PTL 2 discloses LC resonance circuit by using the clock signal being used as control signal
Amplify the voltage obtained from the voltage (24V) of low-tension supply to export and include multiple two poles
The structure of the booster circuit of pipe and capacitor.For this structure, do not use transformator.Therefore,
High voltage power supply can be less and lighter.
Quotation list
Patent documentation
PTL 1: Japanese Patent Laid-Open No.4-352181
PTL 2: Japanese Patent Laid-Open No.2003-189595
Summary of the invention
Technical problem
But, the high voltage power supply that PTL 2 describes has following point.High-tension electricity at PTL 2
In source, the high-voltage value exporting load is predetermined fixed value, and has the letter of fixed frequency
Number it is used as to be input to the control signal of the LC resonance circuit for output voltage.Such as, image
Form the charging roller being used as to load in device and developer roll can have due to the environmental change in device
Or the load caused by the abrasion in the charging roller used and developer roll changes.If image
Form device and do not export charging roller and the voltage of developer roll, then according to this load change regulation
The Poor Image that wherein darkness changes can be produced.Such as, if cited in Ying Yong
High-voltage power circuit in document 2, then be difficult to be adjusted according to load change.Therefore, mistake
High voltage or not afc voltage may be applied to load.
The present invention allows for above-mentioned viewpoint and makes, and it is an object of the present invention to provide
A kind of high voltage power supply that can suitably regulate output voltage according to load change.
The solution of problem
According to the present invention, be characterised by including for the power supply realizing above-mentioned purpose: switch
Unit, is driven according to frequency signal；Voltage resonance unit, be connected to this switch element and
Including inducer and capacitor, when described switch element is driven, voltage is applied to this inducer；
Connect unit, connect this switch element, this inducer and this capacitor；Rectifier unit, bag
Include and be connected to two poles of described connection unit through capacitor in the supply voltage side of described inducer
Pipe；Voltage output unit, the voltage that output obtains from this rectifier unit；And FREQUENCY CONTROL
Unit, according to for arrange the voltage exported from described voltage output unit control signal and from
The output signal of described voltage output unit output controls the frequency of described frequency signal.
The advantageous effects of the present invention
As it has been described above, according to the present invention, output voltage in the high voltage power supply not using transformator
Can change according to load and be suitably adjusted.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the power supply according to embodiment 1.
Fig. 2 is the operation waveform diagram of the circuit shown in Fig. 1.
Fig. 3 is the circuit diagram of another example of the power supply according to embodiment 1.
Fig. 4 includes the operation waveform diagram of the power supply according to embodiment 2.
Fig. 5 is the circuit diagram of the power supply according to embodiment 3.
Fig. 6 includes the operation waveform diagram of the circuit shown in Fig. 5.
Fig. 7 is the circuit diagram of the power supply according to embodiment 4.
Fig. 8 is the operation waveform diagram of the circuit shown in Fig. 7.
Fig. 9 is the circuit diagram of the power supply according to embodiment 5.
Figure 10 illustrates the frequency characteristic of the circuit shown in Fig. 9.
Figure 11 is the operation waveform diagram of the circuit shown in Fig. 9.
Figure 12 is the load characteristic figure of the circuit according to embodiment 1.
Figure 13 is the circuit diagram of the power supply according to embodiment 6.
Figure 14 is the circuit diagram of the power supply according to embodiment 7.
Figure 15 is the circuit diagram of the power supply according to embodiment 8.
Figure 16 is the circuit diagram of the power supply according to embodiment 9.
Detailed description of the invention
It follows that by according to the following examples describe the present invention be used for solve the problems referred to above
Ad hoc structure.Noting, the following examples are only demonstrations, do not imply that the technology of the present invention
Scope is limited only to this.
Embodiment 1
Fig. 1 is illustrate according to embodiment 1 (the highest for producing high-tension power supply
Voltage source) the figure of circuit construction of electric power.In the power circuit shown in Fig. 1, inducer L100
Voltage resonant circuit is constituted with capacitor C100.Inducer L100 be attached to switch element and
The element of power source voltage Vcc (being+24V in the present embodiment), and be that voltage is according to switch
The conduction and cut-off of element and intermittence is applied to the exemplary elements with inductive component thereon.
Capacitor C100 ground connection.It is made up of this inducer L100 and this capacitor C100 and is used as electricity
The output of the voltage resonant circuit of pressure resonant element is rectified by rectification smoothing circuit and is smoothed
Become positive voltage.In rectification smoothing circuit, positive polarity flyback voltage is by allowing electric current along forward
The capacitor C101 of the diode D101 passed through and carrying electric charge is extracted, capacitor C101
It is connected to cathode terminal and the power source voltage Vcc of diode D101.Inducer L100 and diode
Annexation between D101 and capacitor C101 is as follows: the anode tap of diode D101 is even
Receive inducer L100 and the connection unit of capacitor C100 junction；Diode D101's
Cathode terminal is connected to the other end (in supply voltage side) of inducer L100.Additionally, it is multistage whole
Stream 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 smoothing capacitor C106
Ground connection, the waveform of output voltage is smoothed.The output voltage of this multi-stage rectifying device circuit from
Outfan 104 (Vout) as voltage output unit exports.
Additionally, output voltage (Vout) is through voltage sensing resistor R101, voltage grading resistor
R102 and R103, protective resistor R104 and suppression condenser C107 are input to fortune
Calculate the non-inverting input terminal (+end) of amplifier Q100.This circuit is output voltage detecting circuit.
The analogue signal (Vcont) being input to input 103 from controller (not shown) (is used for controlling
The control signal of the output voltage of high voltage power supply processed) it is input to operation amplifier through resistor R105
The inverting terminal (-end) of device Q100.Operational amplifier Q100, resistor R105 and electricity
Container C108 is used as integrating circuit.It is to say, according to integration time constant (according to
The parts constant of capacitor C108 and resistor R105 is arranged) control signal that smooths
Vcont is imported into operational amplifier Q100.In the circuit, from output voltage detecting circuit
The feedback voltage of the non-inverting input terminal (+end) being input to operational amplifier Q100 is conditioned
Become equal to the analog voltage being input to inverting terminal (-end) from controller.
The outfan of operational amplifier Q100 is connected to the VCO as frequency control unit
Device (VCO) 101, frequency control unit controls to be used as the field of switch element (switch element)
The driving frequency of effect transistor Q101.This voltage controlled oscillator 101 is to control letter according to input
Number (Vcont) and the output voltage (Vout) being detected and feeding back, change and be provided for control
The frequency signal (hereinafter referred to as output signal) of the driving frequency of field-effect transistor Q101 processed
The exemplary agitator of frequency.Additionally, be used as to come the frequency signal of voltage controlled oscillator 101
Output signal be imported into the gate terminal of field-effect transistor Q101.Field-effect transistor
The illustrative switch that the pulse output signals that Q101 is exported from voltage controlled oscillator 101 drives
Element.The drain electrode end of field-effect transistor Q101 is connected to what above-mentioned L100 and C100 was constituted
Voltage resonant circuit.The drain electrode end of field-effect transistor Q101 is connected to power supply through inductance L100
Voltage vcc and through capacitor C100 ground connection.Here, the source electrode of field-effect transistor Q101
End ground connection.
In this way, by the voltage resonant circuit (voltage resonant circuit as voltage resonance unit
It being made up of inducer L100 and capacitor C100) voltage that amplifies is directly used as commutator list
The rectifier circuit rectification of unit.By use multi-stage rectifying device circuit (multiple rectifier circuits that
This connects), output increase becomes high voltage.Then, by voltage controlled oscillator (VCO)
Place controls the frequency of output signal according to control signal and output voltage, and output voltage can be adjusted
Save into and be suitable to loading condition.
It follows that Fig. 2 illustrates the operation of various unit when the power circuit shown in Fig. 1 operates
Waveform.Here, 2A represents and is applied to field-effect transistor Q101's from voltage controlled oscillator 101
The waveform (it is square-wave signal) of the voltage of grid.When field-effect transistor Q101 turns on,
Electric current flows to inducer L100 from power source voltage Vcc.Then flow through field-effect transistor Q101
The waveform of drain current represented by 2B.It is to say, according to the time span of electric current flowing,
Energy accumulation is in inducer L100.It follows that when field-effect transistor Q101 ends,
Voltage resonance occurs between capacitor C100 and inducer L100.Now field-effect transistor
The waveform of the drain voltage of Q101 is represented by 2C.The voltage that this voltage waveform represents is commonly referred to
Flyback voltage.By voltage resonance, the maximum V1a of the flyback voltage of resonance circuit becomes and is
The magnitude of voltage of the several times of the magnitude of voltage of power source voltage Vcc.Additionally, voltage can apply effectively
Open to circuit downstream without by the next ON time with field-effect transistor Q101
Mode when this resonance potential becomes 0V or less that starts from arranges and carries out so-called deadline
Hardware switch.The voltage that this resonance circuit produces increases the downstream stage with multi-stage rectifying device circuit
The amount that progression is corresponding.It is arranged in the sun of diode D105 at the afterbody of rectifier circuit
Extreme voltage waveform is represented by 2D.This voltage waveform has maximum voltage value V1b and has
The magnitude of voltage that flyback voltage V1a is superimposed on it.Additionally, the cathode terminal of diode D105
Voltage is constant voltage V1b, at outfan 104 (Vout), by using smoothing capacitor 106
Smoothing and the voltage of cathode terminal of stabilisation diode D105 and the voltage that obtains has 2E table
The voltage waveform shown.
It follows that will be described in detail the operation of rectification smoothing circuit.As field-effect transistor Q101
During cut-off, the positive polarity including the resonance circuit generation of inducer L100 and capacitor C100 is returned
Sweep voltage for charging to capacitor C101 through diode D101.As a result, maximum voltage
Vmax1 is maintained.Diode D101 and capacitor C101 is used as the of rectifier circuit
One-level.Here, by capacitor C101 being connected to cathode terminal and the electricity of first order diode
Source voltage, has the crest voltage waveform of the first order to can get the effect of stabilisation.It follows that work as
During field-effect transistor Q101 conducting, produce back-emf voltage by inducer L100.This
Time, electric charge moves to capacitor C102, capacitor C102 through diode D102 and is electrically charged.
As a result, flyback voltage Vmax1 be applied to capacitor C102 as at capacitor C101
The basis of big voltage Vmax1, maximum voltage Vmax1 zooms into maximum voltage Vmax2
(≈Vmax1×2).This diode D102 and capacitor C102 is used as the second of rectifier circuit
Level.Additionally, due to the electric charge scene effect transistor charging and being stored in capacitor 102
Move to capacitor C103, capacitor C103 through diode 103 during Q101 cut-off be electrically charged.
As a result, maximum voltage Vmax3 (≈ Vmax1 × 3) is maintained at capacitor C103.Afterwards,
By flyback voltage repeatedly increases to holding voltage, repeatedly (number of times is equal to and capacitor C104
The rectifier circuit level relevant with diode D105 with diode D104 and capacitor C105
Number), voltage is amplified similarly.Here, when voltage is exaggerated, produce due to each electric capacity
Loss caused by the performance of device and diode.Therefore, the amplification of the flyback voltage of resonance circuit
The factor can not be the progression of rectifier circuit.However, it is possible to by considering due to each electricity in advance
Loss caused by the performance of container and diode obtains target voltage output.At diode
The voltage that D105 is connected to produce at the connection unit of capacitor C105 is by smoothing capacitor
C106 smooths and exports from outfan 104 (Vout) as burning voltage.Here, in reality
Execute in example 1, control to carry out by this way: the frequency of output signal can change；But,
The dutycycle (ratio between ON time and deadline) of frequency is arranged to fixed value.As above
Described, arrange and arranged in the way of field-effect transistor Q101 does not carries out hardware switch.
Here, Figure 12 illustrates the load characteristic of the typical circuit according to this embodiment.Figure 12 institute
The load characteristic shown is to be 24V at supply voltage, the L=220 μ H of resonance circuit, resonance electricity
The C=330pH on road, and the characteristic in the case of the C=330pH of rectifier circuit.Wherein
The situation with 100M Ω or higher high-resistance load is used to be entered by concrete for use numerical value
Line description.When frequency f is 160kHz, the peak electricity of the flyback voltage of voltage resonant circuit
Pressure is about 180V.When rectifier circuit has level Four, it is that about three times of this crest voltage are high
Voltage, the most about 540V, be output.Additionally, when rectifier circuit has ten grades, be this peak
About six times of high voltages, the most about 1080V of threshold voltage, are output.Additionally, output voltage can
Controlled by changing the flyback voltage of resonance circuit according to incoming frequency.Such as, whole
In the case of the progression of stream device circuit is four, if frequency f is 300kHz (being multiplied by twice),
Then output voltage reduces about half.In this way, relative to supply voltage, can produce enough
High voltage.Additionally, output voltage can be easily according to progression and the control of rectifier circuit
Signal processed and output voltage regulate, and output voltage can be adjusted to have according to load change
Suitable value.
Above embodiments illustrate circuit structure and the circuit of the high voltage power supply that can export positive voltage
Operation, and illustrate the voltage and current waveform operated when carrying out.Here, negative high electricity can be exported
The circuit structure of the high voltage power supply of pressure can pass through the such as circuit realiration shown in Fig. 3.At Fig. 3
In, the diode of rectifier circuit is connected to each other by this way: defeated with the energy shown in Fig. 1
The circuit structure going out positive voltage is compared, the opposite polarity of diode.In addition to this, output electricity
Pressure testing circuit also should have with voltage controlled oscillator 101 circuit constant corresponding with negative high-voltage and
Specification.Additionally, in the case of rectifier circuit has many levels, with the feelings of output positive voltage
Condition is compared, and needs to invert the polarity of whole diode.This passes through comparison diagram 1 and Fig. 3 but clear
Chu, because diode D101, D102, D103, D104 and D105 are inverted.Use
The said structure of power circuit, can produce at outfan 104 (Vout) and have negative polarity
Stablize high voltage.
Here, the target that above-mentioned electronic photographic image forming device high voltage appearance is applied to can be used
Make exporting the example of the load being provided to of the high voltage power supply described in this embodiment.Such as,
Laser beam printer is given the charger unit of the photoconductive charging drum as image bearing member
(charging roller), development are formed at the developer list of the electrostatic latent image on photoconductive drum due to exposure
Unit's (developer roll), the transfer list that the image being developed on photoconductive drum is transferred on recording materials
Unit's (transfer roll) etc. can serve as load.And, in addition to image processing system, need
The load that high voltage and its condition change according to environmental change also can be applied.
As it has been described above, according to this embodiment, in the high voltage power supply not using transformator, output
Voltage can be suitably adjusted according to load change.
Embodiment 2
It follows that the high-tension electricity according to embodiment 2 will be described according to the operation waveform shown in Fig. 4
Source.Here, about the description of the part identical with the circuit of the high voltage power supply according to embodiment 1
To be omitted.Circuit according to embodiment 2 is similar to the electricity according to embodiment 1 shown in Fig. 1
Road.But, the method that the method controlling output voltage of embodiment 2 is different from embodiment 1.
Output electricity is controlled by this way in the method controlling output voltage that embodiment 2 uses
Pressure: be input to (Fig. 4 deadline of the control signal of the gate terminal of field-effect transistor Q101
In the toff time) be set to fixed value, the only ON time (ton in Fig. 4 of control signal
Time) can change.
Similar to Example 1, Fig. 4 illustrates the operation ripple of the various unit of the circuit shown in Fig. 1
Shape, this waveform is the operation waveform according to embodiment 2.Figure (a of Fig. 4 during output low pressure
Part) and output high pressure time figure (the b part of Fig. 4) be separate figure.First, 4A and
4E represents the voltage of the gate terminal being applied to field-effect transistor Q101 from voltage controlled oscillator 101
Waveform.When field-effect transistor Q101 turns on, electric current flows to electricity from power source voltage Vcc
Sensor L100.Then flow through the waveform of drain current of field-effect transistor Q101 by 4B and
4F represents.It is to say, according to the time of electric current flowing, energy accumulation is at inducer L100
In.It follows that when field-effect transistor Q101 ends, voltage resonance occurs at capacitor
Between C100 and inducer L100.The now ripple of the drain voltage of field-effect transistor Q101
Shape is represented by 4C and 4G.The voltage with this waveform is commonly referred to as flyback voltage.Voltage resonance
It is power supply that the maximum V2a (4C) and V2c (4G) making the flyback voltage of resonance circuit becomes
The magnitude of voltage of the several times of voltage vcc.Voltage can be effectively applied to downstream stage circuit and not
Need humorous by the next ON time of field-effect transistor Q101 is set on starting from this
Hardware switch is carried out when the voltage that shakes is 0V or less.The voltage that this resonance circuit produces increases
The amount corresponding with the progression of the downstream stage of rectifier circuit.By utilizing smoothing capacitor C106
Smoothing and stabilisation from the waveform that the voltage waveform that rectifier circuit export is obtained be 4D with
The voltage waveform at outfan 104 (Vout) place that 4H represents.Voltage V2b (4D) and
V2d (4H) is output.
It follows that by description when controlling to be input to field-effect transistor from voltage controlled oscillator 101
The frequency of the control signal of the gate terminal of Q101 is carried out when can carry out in the way of being changed
Operation.In output voltage control based on frequency, output voltage can be with when desired output electricity
When pressing higher frequencies go lower and when expecting that output voltage is lower the mode that uprises of frequency controlled
System.More specifically, when frequencies go lower, during along with the conducting of field-effect transistor Q101
Between ton elongated, more energy storage are in inducer L100.As a result, the flyback of resonance circuit
The maximum of voltage waveform also becomes big.It is to say, the voltage from outfan 104 output uprises.
On the contrary, when frequency uprises, along with the ON time ton of field-effect transistor Q101 shortens,
Less energy storage is in inducer L100.As a result, the flyback voltage waveform of resonance circuit
Maximum also diminishes.It is to say, from the voltage step-down of outfan 104 output.In this way,
Output voltage can be controlled by changing frequency.
About this operation, when the dutycycle (ON time ratio to deadline) in control signal
It is set to the state lower frequency of fixed value when uprising, the ON time of field-effect transistor Q101
Ton and toff deadline similarly shortens.Ton and toff phase deadline between when closed
As shorten and time frequency uprises certain value, Q101 conducting and field-effect transistor Q101's
Drain voltage has electromotive force.It is to say, field-effect transistor Q101 carry out hardware switch and
The loss that switching manipulation causes becomes big.Hardware switch is carried out and drain voltage is high as it has been described above, work as
Time, when Q101 turns on, electric current flows between the drain and source, causes bigger loss.
Therefore, in example 2, as shown in Figure 4, control to carry out by this way:
Toff deadline producing flyback voltage during it is set to fixed value, and control signal is in flyback
Voltage drops to conducting after 0V or lower, and only ON time ton can change.Here,
Toff deadline is made to be longer than the voltage resonance constituted according to inducer L100 and capacitor C100
The time width of the flyback voltage waveform that the resonant frequency of circuit is arranged.Additionally, be used for exporting low
Between ON time ton1 during voltage and the ON time ton2 when output HIGH voltage
Relation controls as ton1 < ton2.
Here, even if (wherein controlling can be by controlling with frequency for the method described in embodiment 1
The dutycycle of signal processed is set to the mode that fixed value changes and carries out) also can be with frequency
Change in frequency range and do not require that the mode of hardware switch is controlled；But, embodiment 2
It is effective in the case of the frequency range being controlled and frequency can change is contemplated to be wider range
's.
As it has been described above, according to this embodiment, output electricity in the high voltage power supply not using transformator
Pressure can obtain suitable regulation according to load change, and can also prevent the carrying out of hardware switch,
Circuit loss can reduce, and stable high voltage can export.
Embodiment 3
It follows that embodiment 3 will be described with reference to Fig. 5 and Fig. 6.Note, about with according to reality
The description of the part that the circuit of the high voltage power supply executing example 1 is identical will be omitted.According to embodiment 3
The circuit of high voltage power supply and be according to the difference of the circuit of embodiment 1, embodiment 3
In the method controlling output voltage used, output voltage is by supply in addition to FREQUENCY CONTROL
The mode that can also change to voltage is controlled and changes.
First, structurally and operationally will be described with reference to Fig. 5 according to the circuit of embodiment 3.
It is input to the analogue signal of input 105 (for high voltage power supply from controller (not shown)
Control signal (Vin)) through resistor R106 be input to operational amplifier Q100 paraphase input
End (-end).Operational amplifier Q100, resistor R106 and capacitor C109 are used as integration
Device circuit.It is to say, according to integration time constant (according to capacitor C109 and electricity
The parts constant of resistance device R106 is arranged) control signal Vin that smooths is imported into computing and puts
Big device Q100.On the other hand, the output voltage produced at outfan 104 is through constituting output electricity
Pressure detection the voltage sensing resistor R101 of device, voltage grading resistor R102 and R103, guarantor
Protect resistor R104 and suppression condenser C107 and be input to the non-of operational amplifier Q100
Inverting terminal (+end).Operational amplifier Q100 will be input to from output voltage detection device
The feedback voltage of non-inverting input terminal (+end) be adjusted to equal to being input to down from controller
The analog voltage of phase input (-end).
The output voltage of operational amplifier Q100 makes the base of transistor Q102 through resistor R107
The electromotive force of pole changes.Additionally, by the electromotive force of the base stage of transistor Q102 is reduced transistor
The voltage that electromotive force between base stage and the emitter stage of Q102 is obtained is applied to inducer L100
Voltage.Here, capacitor C111 is connected will be applied to inducer L100 with stabilisation
Service voltage, and diode D106 is connected to protect transistor Q102.Being used as change will
The structure of the circuit that the voltage of the voltage being applied to this inducer L100 changes unit is this reality
Execute the feature of example 3.
Additionally, control frequency to be input to field-effect transistor from frequency input 106 (Vclk)
The gate terminal of Q101.The dutycycle of this control frequency could be arranged to fixed value or can be strictly according to the facts
Executing can be to arrange in the way of changing by dutycycle described in example 2.In the present embodiment 3,
The frequency preset in the way of preventing field-effect transistor Q101 from carrying out hard switching is from control
Device (not shown) through frequency input 106 (Vclk) as control signal input, control with
The supply voltage that will be applied to inducer L100 can carry out thus obtains the phase in the way of change
The output voltage hoped.In the present embodiment 3, control signal (its frequency can change) is from control
Device processed inputs；But, control can be as described in Example 1 with control signal
Carry out by the way of using voltage controlled oscillator (VCO) to change.
Fig. 6 illustrates the operation waveform of the various unit of the circuit shown in Fig. 5 and includes following figure:
Figure (the part a) of Fig. 6 and the figure (figure when output HIGH voltage during for exporting low-voltage
The part b) of 6.First, 6A and 6F represents that to be applied to field effect from voltage controlled oscillator 101 brilliant
The waveform of the voltage of the grid of body pipe Q101.Toff3 deadline during for exporting low-voltage
And the relation that the deadline when output HIGH voltage is between toff4 is toff3 < toff4, is used for
ON time ton3 during output low-voltage and the ON time ton4 when output HIGH voltage
Between relation be ton3 < ton4.Here, being similar to embodiment 1, dutycycle is set to fix
Value.Additionally, 6B and 6G represents changes dress by the supply voltage of the feature as embodiment 3
Put the voltage being applied to inducer L100.Supply voltage V3a during for exporting low-voltage with
The relation between supply voltage V3d when output HIGH voltage is V3a < V3d.
It follows that when field-effect transistor Q101 turns on, electric current is from power source voltage Vcc stream
To inducer L100.Then flow through the waveform of drain current of field-effect transistor Q101 by 6C
Represent with 6H.Drain current changes according to supply voltage.It follows that work as field effect transistor
During pipe Q101 cut-off, voltage resonance occurs between capacitor C100 and inducer L100.
Now the waveform of the drain voltage of field-effect transistor Q101 is represented by 6D and 6I.This drain electrode
Voltage changes according to supply voltage and drain current.Time here, for exporting low-voltage
State toff3 deadline and start from resonance potential with the next conducting of field-effect transistor Q101 and be
Mode during 0V or lower is arranged.As a result, voltage can be effectively applied to the circuit of downstream stage
And do not carry out hardware switch.
The flyback voltage produced by resonance circuit increases the level of the downstream stage with rectifier circuit
The amount that number is corresponding.By using smoothing capacitor C106 smoothing and stabilisation from commutator electricity
The voltage waveform that obtained of voltage waveform of road output be 6E and 6J represent at outfan 104
(Vout) voltage waveform at place.Supply voltage V3c during for exporting low-voltage with for defeated
The relation between supply voltage V3f when going out high voltage is V3c < V3f.
As it has been described above, according to the present embodiment, do not use output voltage in the high voltage power supply of transformator
Can obtain suitable regulation according to load change, the voltage range being controlled in addition is permissible
By can be to change and the most changeable mode of frequency is controlled and wider with supply voltage.This
In, in the present embodiment 3, although it have been described that control can change and frequency with supply voltage
The most changeable mode of rate is carried out, but wherein output voltage is by becoming fixed value by frequency configuration
And by supply voltage can with change in the way of the method that is controlled obtaining controlling also be effective
's.
Embodiment 4
It follows that embodiments of the invention 4 will be described with reference to Fig. 7 and 8.Note, about with
The description of the part that the circuit of the high voltage power supply according to embodiment 1 is identical will be omitted.This enforcement
The difference of example 4 and above-described embodiment 1 is, as shown in the circuit of Figure 7, and inducer L101
Series connection is plugged on inducer L100 and the company of capacitor C100 connecting and composing voltage resonant circuit
Between order unit and rectifier circuit, and current resonance circuit utilizes diode and the electricity of downstream stage
The capacitance characteristic of container is formed.
Fig. 8 illustrates the operation waveform of the various unit shown in Fig. 7.Here, 8A represents applying
Voltage to the gate terminal of field-effect transistor Q101.Represent and flow through field-effect transistor Q101
The waveform of drain current represented by 8B.The waveform of the drain voltage of field-effect transistor Q101
Represented by 8C.Voltage resonance makes the maximum V4a of flyback voltage be amplified to be power source voltage Vcc
The magnitude of voltage of several times.The waveform of the electric current flowing through inducer L101 is represented by 8D.Here,
This current waveform changes with the constant of circuit.There is the sinusoidal wave current amplitude of constant frequency
I4a is superimposed upon on the electric current flowing through inducer L101.This is the downstream stage according to rectifier circuit
Capacitance characteristic and inducer L101 constant arrange frequency component.The electric capacity of diode is special
Property is the most relatively low, and therefore resonant frequency uprises.Inducer L101 outlet side voltage by
8E represents, the maximum V4b of voltage is almost identical with the maximum V4a of above-mentioned flyback voltage.
But, voltage waveform is by changing through inducer L101, and the virtual value of flyback voltage
Increase.Additionally, voltage amplitude V4c produces in the region that flyback voltage is 0V is by 8E part
The current amplitude superposition with high frequency.By this circuit operation, flyback voltage becomes and has this
The voltage waveform (voltage waveform on fundamental sine wave) of sample, this voltage waveform has and higher has
Valid value.At the anode tap of the diode D105 being arranged at the afterbody of rectifier circuit
The waveform of voltage represented by 8F.This voltage waveform has maximum voltage value V4d, above-mentioned shakes
The voltage V4b of width is superimposed upon on voltage waveform ideally.Additionally, at the moon of diode D105
Extreme voltage is constant voltage V4d.At outfan 104 (Vout) place by advection electric capacity
The voltage waveform of device C106 smoothing and stabilisation is represented by 8G.
As it has been described above, according to the present embodiment, output electricity in the high voltage power supply not using transformator
Pressure can obtain suitable regulation according to load change, and the virtual value of flyback voltage can increase
Greatly.Thus, it is possible to obtain higher output.
Embodiment 5
It follows that embodiment 5 will be described with reference to Fig. 9,10 and 11.Note, about with basis
The description of the part that the circuit of the high voltage power supply of embodiment 1 is identical will be omitted.The present embodiment 5
It is with the difference of above-described embodiment 1, with wherein inducer and the capacitor of embodiment 1
The voltage resonant circuit being connected in parallel is different, by the base stage of NPN transistor Q102 being connected
To the base stage of PNP transistor Q103 and the emitter stage of NPN transistor Q102 is connected to
The emitter stage of PNP transistor Q103 builds push-pull type current amplifier circuit, NPN crystal
Pipe Q102 and PNP transistor Q103 are used as switch element (switch element).Additionally, electric capacity
Device C110 is plugged between the output unit of current amplifier circuit and rectifier circuit and inductance
Device L110 and resistor R110 is connected in series to ground connection, thus constitutes LCR series resonance electricity
Road.In the present embodiment 5, make electricity container C110, inducer L110 and resistor R110
Circuit be shown as the example of current resonance circuit.
The frequency characteristic of this current resonance circuit is shown in Figure 10.Gain at resonant frequency f0
(dB) reaching maximum, f0 is according to the constant of inducer L110 and the constant of capacitor C110
Arrange.Additionally, it is clear that this circuit has the characteristic of high Q.In order to realize more preferably controlling
System, it may be desirable to plant resistor R110 is to optimize the Q of circuit.Therefore, the output of circuit
Performance can be by being improved control frequency configuration near resonant frequency f0.
Figure 11 illustrates the operation waveform of the various unit of the circuit shown in Fig. 9.Here, 11A
Represent the base of the gate terminal being applied to both NPN transistor Q102 and PNP transistor Q103
Pole tension, gate terminal is connected to each other.In NPN transistor Q102 and PNP transistor Q103
The emitter voltage of the emitter terminal of the two is represented by 11B, and emitter terminal is connected to each other.Due to
Define current amplifier circuit, so gate terminal and emitter terminal have essentially identical voltage.
The waveform of the electric current flowing through capacitor C110 is represented by 11C.The phase place of this current waveform be
Before the phase place of voltage waveform that is that gate terminal obtains and that represented by 11A 45 degree.Connecting structure
Become current resonance circuit capacitor C110 and inducer L110 connect voltage at unit by
11D represents, this voltage is transformed into the sine wave with amplitude voltage V5a by current resonance circuit.
The phase place of this voltage waveform is the phase place of voltage waveform that is that obtain in gate terminal and that represented by 11A
After 45 degree next, and the phase place of the current waveform of the capacitor C110 represented at 11C 90
Degree.Electricity at the anode tap of the diode D105 being arranged at the afterbody of rectifier circuit
Corrugating is represented by 11E.This voltage waveform has maximum voltage value V5b, above-mentioned amplitude voltage
V5a is superimposed upon on this voltage waveform ideally.Additionally, at the cathode terminal of diode D105
Voltage is constant voltage V5b.At outfan 104 (Vout) place by smoothing capacitor C106
The voltage waveform of smoothing and stabilisation is represented by 11F.
As it has been described above, according to this embodiment, Current amplifier is entered by push-pull type current resonance circuit
Row and control to carry out near resonant frequency f0 in order to electric current resonance circuit, there is high-gain
Characteristic.Additionally, in the high voltage power supply not using transformator, by by multi-stage rectifying device electricity
Road carries out voltage amplification, and output voltage can obtain suitable regulation according to load change, and can
To obtain higher voltage power.Additionally, also have not according to the circuit structure of the present embodiment 5
The advantage being amenable to high-tension transistor need to be used, because Current amplifier is the electricity utilizing former state
Source voltage is carried out.
Embodiment 6
It follows that the high voltage power supply according to the present embodiment 6 will be described with reference to Figure 13.Note,
Description about the part identical with the circuit of the high voltage power supply according to embodiment 1 will be omitted.
The difference of the present embodiment 6 and above-described embodiment 1 is, has according to the circuit of the present embodiment
There are the first output voltage (Vout1) and two passages of the second output voltage (Vout2).Additionally,
The present embodiment is further characterized in that, the first output voltage is from the commutator electricity as rectifier unit
The afterbody on road obtains, the second output voltage from rectifier circuit relative to its afterbody
Upstream portion obtain.Such as, when rectifier circuit has two-stage, from the first voltage output
Unit output voltage (Vout1) be from rectifier circuit as the second rectifier unit
The output of the second level (it is afterbody), from the voltage of the second voltage output unit output
(Vout2) it is the output of the first order as the first rectifier unit from rectifier circuit.
With reference to Figure 13, circuit structure and operation will be described.As described in Example 1,
Ideal operation according to rectifier circuit, it is possible to obtain be the DC of n times of flyback voltage Vmax
Output (n is integer).More specifically, it is that the output of Vmax twice can be in Figure 13 institute
The cathode side of the D103 shown obtains.Here, if the output of n times of Vmax is at Figure 13
The cathode side of the D105 of shown circuit obtains, say, that if rectifier circuit has
Wherein output Vout1 is the structure of n or Vmax × n, then output Vout2 is Vmax (n 1)
Times.Therefore, two the free voltage outputs being expressed as can obtain from the circuit shown in Figure 13.
Vout1=n × Vmax (equation 1)
Vout2=(n 1) × Vmax (equation 2)
(n is integer)
Additionally, circuit structure is the most inexpensive, electric field is exported with acting on by the most only C112
The part of Vout.Here, in the present embodiment 6, two have been had been described with for output voltage
The situation of passage, but be not limited to two for the port number of output voltage.Circuit structure can
To have three or more passages.In this case, each in many output voltages should be from
Corresponding one-level in rectifier stage obtains.
As it has been described above, according to the present embodiment, output electricity in the high voltage power supply not using transformator
Pressure can be suitably adjusted according to load change, and can obtain the output of multiple high voltage.
Embodiment 7
It follows that the high voltage power supply according to embodiment 7 will be described with reference to Figure 14.Note, close
Description in the part identical with the circuit of the high voltage power supply according to embodiment 1 will be omitted.Should
Difference between embodiment 7 and above-described embodiment 6 will be described below.
In being described in embodiment 6 and be shown in the circuit in Figure 13, such as 2 tables of equation
As showing, it is the maximum peak voltage Vmax of flyback voltage that output voltage Vout2 is only capable of obtaining
The value of n times.In the present embodiment 7 shown in Figure 14, voltage grading resistor circuit be employed from
And allow to the free voltage outside n times of voltage of acquisition.
The circuit structure of the present embodiment 7 and operation will utilize Figure 14 to describe.It is Vmax
The voltage output of n times obtains at the cathode side of the D105 of the circuit shown in Figure 14.It is to say,
When rectifier circuit has the structure that wherein output Vout1 is n × Vmax, D105's
The voltage of cathode side is Vmax (n 1) times.So, output Vout2 is to pass through electricity consumption
The voltage that the voltage that anode-side at D104 obtains is obtained by resistance device R108 and R109.
This Vout2 is (R109/R108+R109) × (n 1) × Vmax.It is to say,
In circuit shown in Figure 14, it is possible to obtain two free voltages as represented by equation below
Output.
Vout2=(R109/R108+R109) × (n 1) × Vmax (equation 3)
Additionally, be used for exporting the electricity of free voltage Vout2 (it is not the integral multiple of Vmax)
Road has the most inexpensive circuit structure including R108, R109 and C112.Here, exist
The present embodiment 7 has been described with the situation of two output voltage passages, but output voltage
The quantity of passage is not limited to two.Circuit structure can have three or more passage.In these feelings
Under condition, each in many output voltages should the corresponding one-level from rectifier stage obtain.
As it has been described above, according to the present embodiment, output electricity in the high voltage power supply not using transformator
Pressure can be suitably adjusted according to load change, and can obtain the output of multiple high voltage.
Embodiment 8
It follows that embodiment 8 will be described with reference to Figure 15.Note, about with according to embodiment 1
The description of the identical part of the circuit of high voltage power supply will be omitted.Embodiment 8 and above-mentioned enforcement
Difference between example 7 will be described below.
In being described in embodiment 7 and be shown in the circuit in Figure 14, such as equation 3 institute
As expression, output voltage Vout2 is as the resistor divider using R108 and R109
Result and the free voltage that obtains.The present embodiment 8 is characterised by, free voltage is by making
It is used as the Zener diode D106 of constant voltage elements and obtains.
Circuit structure and operation will be described with reference to Figure 15.At the circuit shown in Figure 15
The cathode side of D105 obtains the voltage output of n times that is Vmax.It is to say, work as commutator
When circuit has the structure that wherein voltage output Vout1 is n × Vmax, at the anode of D104
The voltage of side is Vmax (n 1) times.Output Vout2 is from the anode-side at D104
The voltage obtained deducts the value that Zener voltage Vz of Zener diode D106 is obtained, therefore
Vout2 is (n 1) × Vmax Vz.It is to say, in the circuit shown in Figure 15,
Two free voltage outputs can be obtained as shown below.
Vout2=(n 1) × Vmax Vz (equation 4)
Additionally, the circuit tool of the free voltage Vout2 for exporting the integral multiple not being Vmax
There is the most inexpensive circuit structure including D106, C112 and R110.
Here, the R110 in Figure 15 is for ensureing the Zener voltage of D105.If connected
Load can ensure that Zener voltage, then R110 can omit.Here, wherein have two defeated
The situation going out voltage channel has been described in the present embodiment 8, but the number of output voltage passage
Mesh is not limited to two.Circuit structure can have three or more passage.In this case, many
Each in individual output voltage should the corresponding one-level from rectifier stage obtain.Additionally, in this reality
Execute Zener diode in example 8 and be used as constant voltage elements；But, rheostat can be used as.
As it has been described above, according to the present embodiment, output electricity in the high voltage power supply not using transformator
Pressure can be suitably adjusted according to load change, and can obtain the output of multiple high voltage.
Embodiment 9
It follows that the power supply according to embodiment 9 will be described with reference to Figure 16.Note, about with
The description of the part that the circuit of the high voltage power supply according to embodiment 1 is identical will be omitted.This enforcement
Difference between example 9 and above-described embodiment 8 will be described below.
In being described in embodiment 8 and be shown in the circuit in Figure 15, fortune will be fed back to
The feedback voltage calculating amplifier Q100 is to fluctuate with compensation output voltage from what Vout1 obtained.
But, the present embodiment 9 obtains feedback voltage from Vout2.Using this structure, feedback voltage leads to
The withstanding voltage of the parts used in road can be lower.More specifically, the withstanding voltage of R111
Can lower and can realize cost reduce.
Additionally, in the circuit shown in Figure 13 and 14, be similar to the present embodiment 9, cost subtracts
Little can realize by obtaining feedback voltage from Vout2.Here, wherein there are two output electricity
The situation of pressure passageway has been described in the present embodiment 9, but the quantity of output voltage passage is not
It is limited to two.Circuit structure can have three or more passage.In this case, multiple defeated
Go out in voltage each should the corresponding one-level from rectifier stage obtain.
As it has been described above, according to the present embodiment, output electricity in the high voltage power supply not using transformator
Pressure can be suitably adjusted according to load change, and can obtain the output of multiple high voltage.
Reference numerals list
L100 inducer
Q101 field-effect transistor
C100, C101, C102, C103, C104, C105 capacitor
D101, D102, D103, D104, D105 diode
Claims (9)
1. a high voltage power supply, it is characterised in that including:
Inducer；
The switch element being connected with described inducer, it is described that described switch element is configured to driving
Inducer；
Voltage amplification unit, is used for the voltage amplification generated in described inducer and exports
Amplified voltage, voltage amplification unit is connected to described inducer and comprises multiple rectification list
Unit, each self-contained capacitor of the plurality of rectification unit and diode；And
Control unit, for by making the frequency the driving signal mode close to resonant frequency control
Drive the frequency driving signal of described switch element, with the electricity that will export from voltage amplification unit
Pressure changes into the second voltage higher than the first voltage from the first voltage.
2. high voltage power supply as claimed in claim 1,
Wherein, driving signal is square-wave signal, and
Wherein, described control unit controls to put from voltage by changing the ON time of square wave
The voltage of big unit output.
3. high voltage power supply as claimed in claim 1 or 2, also includes voltage altering device,
Voltage altering device is applied to the voltage of described switch element for changing via inducer,
Wherein, the voltage that voltage altering device is applied to switch element by change changes from electricity
Press the voltage of big unit output.
4. high voltage power supply as claimed in claim 1 or 2,
Wherein, voltage amplification unit includes the capacitor that the one end with inducer is connected, and
Wherein, another different from described inducer inducers is connected to described capacitor and voltage
Between amplifying unit.
5. high voltage power supply as claimed in claim 1, wherein, described switch element includes field
Effect transistor.
6. high voltage power supply as claimed in claim 1,
Wherein, voltage amplification unit includes that the first voltage output unit and the output of the second voltage are single
Unit, and
Wherein, the voltage from the first voltage output unit output is different from from the second voltage output single
The voltage of unit's output.
7. high voltage power supply as claimed in claim 1, wherein, voltage amplification unit is multistage
Rectifier circuit, the multi-stage rectifying device circuit of the most each self-contained capacitor and diode is connected to
Two lines, each in described two lines is connected to the different end of described inducer.
8. an image processing system, it is characterised in that including:
Figure forms unit, for forming image on image bearing member；With
High voltage power supply, is configured to apply high voltage to image formation unit, and high voltage power supply includes:
Inducer；
The switch element being connected with described inducer, described switch element is configured to drive
Described inducer；
Voltage amplification unit, for will in described inducer generate voltage amplification and
Exporting amplified voltage, voltage amplification unit is connected to described inducer and comprises multiple whole
Stream unit, each self-contained capacitor of the plurality of rectification unit and diode, and
Control unit, for by making the frequency the driving signal mode close to resonant frequency
Control to drive the frequency driving signal of described switch element, will export from voltage amplification unit
Voltage change into the second voltage higher than the first voltage from the first voltage.
9. image processing system as claimed in claim 8, wherein, described image forms list
Unit comprises any item in following item: for the charhing unit to image bearing member charging, uses
In the developing cell of the image development that will be formed on image bearing member, and for being formed
Image on image bearing member is transferred to the transfer printing unit on recording materials.
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| 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 |
|---|---|---|---|
| CN200980163054.7A CN102656786B (en) | 2009-12-26 | 2009-12-26 | High voltage source |
| CN201610201997.6A CN105871199B (en) | 2009-12-26 | 2009-12-26 | high voltage power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742970A (en) * | 2017-10-11 | 2018-02-27 | 湖北久之洋红外系统股份有限公司 | A Si‑APD Bias Circuit |
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| 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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2009
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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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| CN107742970A (en) * | 2017-10-11 | 2018-02-27 | 湖北久之洋红外系统股份有限公司 | A Si‑APD Bias Circuit |
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