CN108429461A - High-voltage power circuit - Google Patents
High-voltage power circuit Download PDFInfo
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- CN108429461A CN108429461A CN201810230133.6A CN201810230133A CN108429461A CN 108429461 A CN108429461 A CN 108429461A CN 201810230133 A CN201810230133 A CN 201810230133A CN 108429461 A CN108429461 A CN 108429461A
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- 230000003321 amplification Effects 0.000 claims abstract description 32
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 32
- 230000002441 reversible effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
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- 230000006641 stabilisation Effects 0.000 description 2
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- 206010037660 Pyrexia Diseases 0.000 description 1
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Classifications
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—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 with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Control Of Voltage And Current In General (AREA)
Abstract
A kind of high-voltage power circuit includes：Positive high voltage oscillating unit, negative high voltage oscillating unit, voltage superposition unit, positive high voltage voltage sampling unit, negative high voltage voltage sampling unit, differential amplification unit, High voltage output unit, load current sampling unit and operation amplifier unit, the input terminal of positive high voltage oscillating unit is connect with PWM output signal, the output end of positive high voltage oscillating unit is connect with the first input end of voltage superposition unit, the input terminal of negative high voltage oscillating unit and the input terminal of constant pressure source connect, first output end of negative high voltage oscillating unit is connect with the second input terminal of voltage superposition unit, the output end of voltage superposition unit exports high voltage power supply.The present invention is by being arranged voltage superposition unit, high voltage power supply will be exported after the voltage superposition of positive high voltage oscillating unit and negative high voltage oscillating unit, and the high voltage power supply of output is adjusted after the high-voltage feedback by exporting High voltage output unit to positive high voltage oscillating unit, to improve the precision of power supply output, reliability higher.
Description
Technical field
The present invention relates to a kind of power circuit fields, more particularly to a kind of high-voltage power circuit.
Background technology
The TX of laser printer power supply usually needs that positive high voltage and negative high-voltage is used to be superimposed output, and needs defeated
Go out voltage and realizes linear convergent rate with the variation of pwm signal duty ratio.Especially in PWM duty cycle 0%, the height of -1500V is exported
Pressure (band carries 30uA, equivalent output impedance 50M Ω), positive high voltage converter has been stopped under the conditions of this, traditional high-voltage electricity
The TX outputs of source circuit are to pass through bypass resistance (resistance of tri- 15M Ω of R503, R504, R505, in total 45M Ω) by negative high voltage
With voltage sampling resistor (resistance of two 180M Ω of R515, R519, in total 360M Ω) and output equivalent impedance (50M Ω) and
The simplification circuit divided between connection resistance, is illustrated in fig. 1 shown below.
In the case where negative high voltage is certain, to obtain enough -1500V outputs, need bypass resistance R503, R504,
R505 values very little (45M Ω), and negative feedback voltage sample resistance R515, R519 value are very big (180M Ω), and based on existing
Some resistance production technologies, the cost of high valued resistor is more expensive and precision is poor, and such as the resistance of 180M Ω, precision is most
It can only mostly accomplish 2%, and be influenced by ambient temperature and humidity very big so that the precision of the TX output voltages of laser printer power supply
It is not high, poor reliability；If carrying out series connection with multiple resistance compared with low resistance to replace, since the increase cost of resistance number also will
It significantly increases, and more resistance number can increase the difficulty of board design, increase the volume of product.Bypass resistance
It is too small, cause power dissipation above to increase significantly, especially when positive high voltage exports highest, product temperature rises and the service life is difficult to reach
Customer requirement.
Invention content
The purpose of the present invention is overcoming shortcoming in the prior art, provide that a kind of reliability is higher, precision is higher
High-voltage power circuit.
The purpose of the present invention is achieved through the following technical solutions：
A kind of high-voltage power circuit, including：Positive high voltage oscillating unit, negative high voltage oscillating unit, voltage superposition unit, positive height
Piezoelectricity presses sampling unit, negative high voltage voltage sampling unit, differential amplification unit, High voltage output unit, load current sampling unit
And operation amplifier unit,
The input terminal of the positive high voltage oscillating unit is connect with PWM output signal, the output of the positive high voltage oscillating unit
End is connect with the first input end of the voltage superposition unit, the input of the input terminal and constant pressure source of the negative high voltage oscillating unit
End connection, the first output end of the negative high voltage oscillating unit is connect with the second input terminal of the voltage superposition unit, described
The output end of voltage superposition unit exports high voltage power supply；
The input terminal of the positive high voltage voltage sampling unit is connect with the output end of the positive high voltage oscillating unit, it is described just
The output end of high tension voltage sampling unit is connect with the first input end of the differential amplification unit, the negative high voltage oscillating unit
The first output end also connect with the input terminal of the negative high voltage voltage sampling unit, the negative high voltage voltage sampling unit it is defeated
Outlet is connect with the second input terminal of the differential amplification unit, the output end of the differential amplification unit and the High voltage output
The input terminal of unit connects, and the output end of the High voltage output unit is connect with the input terminal of the positive high voltage oscillating unit；
The collection terminal of the load current sampling unit is connect with the second output terminal of the negative high voltage oscillating unit, described
The output end of load current sampling unit is connect with the current input terminal of the operation amplifier unit, the High voltage output unit
Output end is also connect with the voltage input end of the operation amplifier unit, and the output end of the operation amplifier unit realizes logic electricity
Pressure output.
In one embodiment of the present embodiment, the voltage superposition unit includes first resistor R1 and the 5th resistance R5, institute
The first end for stating first resistor R1 is connect with the first voltage output end of the positive high voltage oscillating unit, the first resistor R1's
Second end is connect with the first end of the 5th resistance R5, second end and the negative high voltage oscillating unit of the 5th resistance R5
The first output end connection.
In one embodiment of the present embodiment, the positive high voltage voltage sampling unit includes 3rd resistor R3, the third
The first end of resistance R3 is connect with the connecting node of the first resistor R1 and the 5th resistance R5, the 3rd resistor R3's
Second end is connect with the first input end of the differential amplification unit.
In one embodiment of the present embodiment, the negative high voltage voltage sampling unit includes the 4th resistance R4, the 6th resistance
The first end of R6 and the 9th resistance R9, the 6th resistance R6 connect with the first voltage output end of the negative high voltage oscillating unit
It connects, the second end of the 6th resistance R6 connects after the 4th resistance R4 with the second input terminal of the differential amplification unit
It connects, one end of the 9th resistance R9 is connect with the second input terminal of the differential amplification unit, other end ground connection.
In one embodiment of the present embodiment, the differential amplification unit include the 8th resistance R8, third diode D3 and
Difference amplifier U1A, the plus earth of the third diode D3, the cathode of the third diode D3 is respectively with the described 8th
The first end of resistance R8 is connected with the inverting input of the difference amplifier U1A, the second end of the 8th resistance R8 and institute
State the output end of difference amplifier U1A, the in-phase input end of the difference amplifier U1A and the negative high voltage voltage sampling unit
Output end connection.
In one embodiment of the present embodiment, the High voltage output unit includes zener diode D4 and thirteenth resistor
R13, the cathode of the zener diode D4 are connect with the output end of the difference amplifier U1A, the zener diode D4's
Anode is connect with the first end of the thirteenth resistor R13, the second end ground connection of the thirteenth resistor R13, and the high pressure is defeated
Go out unit for by the anode of zener diode D4 output positive high voltage signal.
In one embodiment of the present embodiment, the load current sampling unit includes current acquisition resistance R27, the electricity
One end of stream acquisition resistance R27 is connect with the second output terminal of the negative high voltage oscillating unit, the current acquisition resistance R27's
The other end is connect with the current input terminal of the operation amplifier unit.
In one embodiment of the present embodiment, the operation amplifier unit includes the 26th resistance R26, the 28th electricity
Resistance and operational amplifier U2C, the 26th resistance R26 first end respectively with the output end of the High voltage output unit and
The reverse input end of the operational amplifier U2C connects, second end and the operational amplifier of the 26th resistance R26
The output end of U2C connects, and the in-phase input end of the operational amplifier U2C and the output end of the load current sampling unit connect
It connects.
In one embodiment of the present embodiment, the high-voltage power circuit further includes positive high voltage input unit, the positive height
The input terminal of pressure input unit is connect with the PWM output signal, the output end of the positive high voltage input unit and the positive height
Press the input terminal connection of oscillating unit.
In one embodiment of the present embodiment, the high-voltage power circuit further includes negative high voltage input unit, the negative height
The input terminal of the input terminal and constant pressure source of pressing input unit connects, output end and the negative high voltage of the negative high voltage input unit
The input terminal of oscillating unit connects.
Compared with prior art, the present invention has at least the following advantages：
1, high-voltage power circuit of the invention, by the way that voltage superposition unit is arranged, by positive high voltage oscillating unit and negative high voltage
High voltage power supply is exported after the voltage superposition of oscillating unit, and the high-voltage feedback by exporting High voltage output unit to positive high voltage shakes
The high voltage power supply that output is adjusted after unit is swung, to improve the precision of power supply output so that the scope of application of power supply is wider, the height
Piezoelectricity source circuit precision is high, is not easy to be interfered by super-humid conditions, reliability higher.Simultaneously as this high-voltage power circuit uses
The resistance that precision is 1% further improves the precision of power supply output, and the resistance value that the present invention uses is relatively low, compared to existing
Circuit in comprising multiple 180M Ω resistance for, reduce the cost of product, improve the reliability of high-tension circuit.
2, by the way that bypass resistance is arranged the effect of partial pressure may be implemented, and positive high using difference amplifier realization in the present invention
The voltage sample of output is pressed, can avoid using high level sampling resistor, improve sampling precision, reduce cost, reduce loss.
Meanwhile partial pressure sampling is also carried out using bypass resistance in negative high voltage output, negative high voltage sampling resistor is saved, further reduced
Cost.
Description of the drawings
Fig. 1 is the circuit diagram of high-voltage power circuit in the prior art；
Fig. 2 is the schematic block circuit diagram of the high-voltage power circuit of one embodiment of the invention；
Fig. 3 is the circuit diagram of the high-voltage power circuit of Fig. 2.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant Listed Items.
In one embodiment, in the case where negative high voltage is certain, to obtain enough -1500V outputs, bypass resistance is needed
R503, R504, R505 value very little (45M Ω), and the very big (180M of negative feedback voltage sample resistance R515, R519 value
Ω), it is based on existing resistance production technology, the cost of high valued resistor is more expensive and precision is poor, such as 180M Ω
Resistance, precision can only at most accomplish 2%, and be influenced by ambient temperature and humidity very big so that the TX of laser printer power supply
The precision of output voltage is not high, poor reliability；If carrying out series connection with multiple resistance compared with low resistance to replace, due to resistance number
Increase cost also will significantly increase, and more resistance number can increase the difficulty of board design, increase product
Volume.Bypass resistance is too small, and power dissipation above is caused to increase significantly, especially when positive high voltage exports highest, product temperature
It rises and the service life is difficult to reach customer requirement.It should be noted that because in the basic of positive high voltage converter output terminal parallel resistance
Effect is to provide access for the negative current of negative high voltage converter, and positive high voltage rectification circuit itself cannot provide this access,
One bypass can only be provided with parallel resistance.It is it that this parallel resistance, which becomes the dead load of positive high voltage converter or fictitious load,
Side effect, and be undesirable.Similarly, negative high voltage output end parallel resistance is carried for the forward current of positive high voltage converter
For access or bypass.It is understood that there are contradictions for the value of bypass resistance：With the bypass electricity of positive high voltage converter output terminal
For resistance, bypass resistance value is big, negative high voltage loss can be caused excessive, bypass resistance value is small, and can increase and be existed by positive high voltage
The loss and fever generated thereon, and aggravate the load of positive high voltage converter.Therefore, the value needs of bypass resistance consider
The scheme that two aspects are compromised.It needs to realize voltage sample in positive high voltage output end connection sampling resistor in the prior art,
Sample rate current can aggravate the value contradiction of above-mentioned bypass resistance, cause to generate more losses on bypass resistance.It is this not for reduction
Profit influences, and the resistance value of usual sampling resistor is all very big (such as 360Meg).Since high value resistor precision is low, price is high, this is again
Sampling precision reduction is resulted in, cost increases.Therefore, the present invention provides a kind of high-voltage power circuit, including：Positive high voltage oscillation is single
Member, negative high voltage oscillating unit, voltage superposition unit, positive high voltage voltage sampling unit, negative high voltage voltage sampling unit, differential amplification
Unit, High voltage output unit, load current sampling unit and operation amplifier unit, the input terminal of the positive high voltage oscillating unit with
PWM output signal connects, and the output end of the positive high voltage oscillating unit is connect with the first input end of the voltage superposition unit,
The input terminal of the negative high voltage oscillating unit and the input terminal of constant pressure source connect, the first output end of the negative high voltage oscillating unit
It is connect with the second input terminal of the voltage superposition unit, the output end of the voltage superposition unit exports high voltage power supply；It is described
The input terminal of positive high voltage voltage sampling unit is connect with the output end of the positive high voltage oscillating unit, the positive high voltage voltage sampling
The output end of unit is connect with the first input end of the differential amplification unit, the first output end of the negative high voltage oscillating unit
It is also connect with the input terminal of the negative high voltage voltage sampling unit, output end and the difference of the negative high voltage voltage sampling unit
Divide the second input terminal connection of amplifying unit, the input terminal of the output end of the differential amplification unit and the High voltage output unit
Connection, the output end of the High voltage output unit are connect with the input terminal of the positive high voltage oscillating unit；The load current is adopted
The collection terminal of sample unit is connect with the second output terminal of the negative high voltage oscillating unit, the output of the load current sampling unit
End is connect with the current input terminal of the operation amplifier unit, the output end of the High voltage output unit also with the operation amplifier
The voltage input end of unit connects, and the output end of the operation amplifier unit realizes logic voltage output.The high-voltage electricity of the present invention
Source circuit will be exported by the way that voltage superposition unit is arranged after the voltage superposition of positive high voltage oscillating unit and negative high voltage oscillating unit
High voltage power supply, and the high-voltage electricity of output is adjusted after the high-voltage feedback by exporting High voltage output unit to positive high voltage oscillating unit
Source, to improve the precision of power supply output so that the scope of application of power supply is wider, and high-voltage power circuit precision is high, be not easy by
The interference of super-humid conditions, reliability higher.Simultaneously as this high-voltage power circuit uses precision for 1% resistance, further carry
The high precision of power supply output, and the resistance value that the present invention uses is relatively low, compared to including multiple 180M Ω's in existing circuit
For resistance, the cost of product is reduced, improves the reliability of high-tension circuit.The present invention is by being arranged bypass resistance, Ke Yishi
The effect now divided, and the voltage sample that positive high voltage exports is realized using difference amplifier, it can avoid using high level sampling resistor,
Sampling precision is improved, cost is reduced, reduces loss.Meanwhile it also being divided using bypass resistance in negative high voltage output
Sampling, saves negative high voltage sampling resistor, further reduces costs.The present invention is also provided with operation amplifier unit, that is,
Output current detection circuit obtains the voltage signal for being proportional to output current by operational amplifier U2C through circuit computing.
In order to preferably be illustrated to above-mentioned high-voltage power circuit, to more fully understand the structure of above-mentioned high-voltage power circuit
Think, referring to Fig. 2, a kind of high-voltage power circuit 10 includes：Positive high voltage oscillating unit 100, negative high voltage oscillating unit 200, voltage
Superpositing unit 300, positive high voltage voltage sampling unit 400, negative high voltage voltage sampling unit 500, differential amplification unit 600, high pressure
Output unit 700, load current sampling unit 800 and operation amplifier unit 900.It should be noted that the positive high voltage oscillation
Unit 100 is for exporting stable positive high-voltage signal, and the negative high voltage oscillating unit 200 is for exporting stable cathode high pressure
Signal, the voltage superposition unit 300 are used for the positive high voltage oscillating unit 100 and the negative high voltage oscillating unit 200 is defeated
High voltage power supply is exported after the voltage signal superposition gone out, the positive high voltage voltage sampling unit 400 is single for obtaining positive high voltage oscillation
The positive high voltage signal of 100 output of member, the negative high voltage voltage sampling unit 500 is for obtaining the output of negative high voltage oscillating unit 200
Negative high voltage signal, the differential amplification unit 600 will export after the positive high voltage signal of reception and the amplification of negative high voltage signal positive high
Frequency voltage, the High voltage output unit 700 is for exporting stable positive high-voltage signal, the load current sampling unit 800
Current signal for acquiring negative high voltage oscillating unit, the operation amplifier unit 900 is for exporting logic voltage signal.
Referring to Fig. 2, the input terminal of the positive high voltage oscillating unit 100 is connect with PWM output signal, the positive high voltage shakes
The output end for swinging unit 100 is connect with the first input end of the voltage superposition unit 300, the negative high voltage oscillating unit 200
Input terminal and the input terminal of constant pressure source connect, the first output end of the negative high voltage oscillating unit 200 and the voltage superposition
Second input terminal of unit 300 connects, and the output end of the voltage superposition unit 300 exports high voltage power supply；The positive high voltage electricity
The input terminal of pressure sampling unit 400 is connect with the output end of the positive high voltage oscillating unit 100, the positive high voltage voltage sampling list
The output end of member 400 is connect with the first input end of the differential amplification unit 600, and the of the negative high voltage oscillating unit 200
One output end is also connect with the input terminal of the negative high voltage voltage sampling unit 500, the negative high voltage voltage sampling unit 500
Output end is connect with the second input terminal of the differential amplification unit 600, the output end of the differential amplification unit 600 with it is described
The input terminal of High voltage output unit 700 connects, the output end of the High voltage output unit 700 and the positive high voltage oscillating unit
100 input terminal connection；The collection terminal of the load current sampling unit 800 and the second of the negative high voltage oscillating unit 200
Output end connects, and the output end of the load current sampling unit 800 and the current input terminal of the operation amplifier unit 900 connect
It connects, the output end of the High voltage output unit 700 is also connect with the voltage input end of the operation amplifier unit 900, the fortune
The output end for calculating amplifying unit 900 realizes logic voltage output.It should be noted that the PWM output signal is an externally input
Control voltage signal, the constant pressure source is the external 18V constant voltages provided.The high-voltage power circuit of the present invention, by setting
Voltage superposition unit is set, high voltage power supply will be exported after the voltage superposition of positive high voltage oscillating unit and negative high voltage oscillating unit, and logical
The high voltage power supply of output will be adjusted by crossing after high-voltage feedback to positive high voltage oscillating unit that High voltage output unit exports, to improve electricity
The precision of source output so that the scope of application of power supply is wider, and the high-voltage power circuit precision is high, is not easy to be done by super-humid conditions
It disturbs, reliability higher.
In order to which the scope of application for improving power supply is wider, the stability of output voltage is improved, the High voltage output unit 700
Output end is connect with the input terminal of the positive high voltage oscillating unit 100, is adjusted by the way that closed loop is arranged, and it is anti-greatly to use voltage
Feedback, makes voltage-regulation coefficient increase substantially, and by the way that the positive high frequency voltage of feedback output is arranged, can improve the adjusting of output voltage
Range, i.e. output voltage can be stablized between -1500V~+5000V.
Referring to Fig. 3, the voltage superposition unit 300 includes first resistor R1 and the 5th resistance R5, the first resistor
The first end of R1 is connect with the first voltage output end of the positive high voltage oscillating unit 100, the second end of the first resistor R1
It is connect with the first end of the 5th resistance R5, second end and the negative high voltage oscillating unit 200 of the 5th resistance R5
First output end connects.The positive high voltage voltage sampling unit includes 3rd resistor R3, the first end of the 3rd resistor R3 with
The first resistor R1 is connected with the connecting node of the 5th resistance R5, second end and the difference of the 3rd resistor R3
The first input end of amplifying unit connects.It should be noted that be mainly used for superposition in voltage superposition unit 300 is
First resistor R1, and the resistance value of the first resistor R1 is 43M Ω, precision 1% further improves the essence of power supply output
Degree, and the resistance value that the present invention uses is relatively low, for the resistance comprising multiple 180M Ω in existing circuit, reduces production
The cost of product improves the reliability of the high-voltage power circuit.The second end of the 5th resistance R5 is also shaken with the positive high voltage
The cathode output end connection for swinging unit 100, therefore, because the second end of the 5th resistance R5 is separately connected the positive high voltage
The output end of the output end and negative high voltage oscillating unit 200 of oscillating unit 100, so the 5th resistance R5 is used to acquire negative height on one side
Signal is pressed, and high voltage power supply is exported after being superimposed with the first resistor R1, meanwhile, the 5th resistance R5 is used to acquire positive height again
The output signal for pressing oscillating unit 100, is input in 3rd resistor R3, and further, the 3rd resistor R3 is for acquiring the
The positive high voltage signal of one resistance R1 and the 5th resistance R5, is input in differential amplification unit.
Referring to Fig. 3, the negative high voltage voltage sampling unit 500 includes the 4th resistance R4, the 6th resistance R6 and the
Nine resistance R9, the first end of the 6th resistance R6 is connect with the first voltage output end of the negative high voltage oscillating unit, described
The second end of 6th resistance R6 is connect after the 4th resistance R4 with the second input terminal of the differential amplification unit, and described
One end of nine resistance R9 is connect with the second input terminal of the differential amplification unit, other end ground connection.It should be noted that passing through
The 4th resistance R4, the 6th resistance R6 and the 9th resistance R9, which is arranged, can acquire the output voltage of negative high voltage oscillating unit, and by
After four resistance R4, the 6th resistance R6 and the 9th resistance R9 are divided, it is input in differential amplification unit.
In the present embodiment, the differential amplification unit 600 includes the 8th resistance R8, third diode D3 and differential amplification
Device U1A, the plus earth of the third diode D3, the cathode of the third diode D3 is respectively with the 8th resistance R8's
First end is connected with the inverting input of the difference amplifier U1A, and the second end of the 8th resistance R8 is put with the difference
The output end of big device U1A, the output end of the in-phase input end of the difference amplifier U1A and the negative high voltage voltage sampling unit
Connection.By the way that difference amplifier U1A is arranged, interference can be filtered out, voltage signal is amplified.
In the present embodiment, the High voltage output unit 700 includes zener diode D4 and thirteenth resistor R13, described
The cathode of zener diode D4 is connect with the output end of the difference amplifier U1A, the anode of the zener diode D4 and institute
The first end connection of thirteenth resistor R13, the second end ground connection of the thirteenth resistor R13 are stated, the High voltage output unit is used
Positive high voltage signal is exported in the anode by the zener diode D4, i.e., the anode of the described zener diode D4 is also used as high pressure
The output end of output unit.By the way that zener diode D4 and thirteenth resistor R13 is arranged, the stabilization of the voltage of output can be improved
Property, ensure output voltage stabilization and efficiently.
In the present embodiment, the load current sampling unit 800 includes current acquisition resistance R27, the current acquisition
One end of resistance R27 is connect with the second output terminal of the negative high voltage oscillating unit, the other end of the current acquisition resistance R27
It is connect with the current input terminal of the operation amplifier unit.The operation amplifier unit 900 includes the 26th resistance R26, the
The first end of 28 resistance and operational amplifier U2C, the 26th resistance R26 respectively with the High voltage output unit
Output end is connected with the reverse input end of the operational amplifier U2C, second end and the fortune of the 26th resistance R26
Calculate the output end connection of amplifier U2C, the in-phase input end of the operational amplifier U2C and the load current sampling unit
Output end connects.By the way that current acquisition resistance R27 and operational amplifier U2C is arranged, High voltage output unit 700 can be exported
The current signal (ios) that voltage signal (Vps) is exported with load current sampling unit 800 is input in operational amplifier U2C, and
Realize logical output voltage (Serve Out) with load current linear change.It should be noted that in order to operation amplifier
Device U2C provides stable collection voltages and improves the collecting efficiency of voltage, and the operation amplifier unit 900 further includes the 29th
Resistance R29, the 24th resistance R24 and the 25th resistance R25, one end and the high pressure of the 29th resistance R29
The output end of output unit connects, and the other end is connected in series with the 26th resistance R26, the 24th resistance R24
First end connect with the constant pressure source, the second end of the 24th resistance R24 and the 29th resistance R29 and institute
State the 26th resistance R26 connecting node connection, and the second end of the 24th resistance R24 also with the operational amplifier
The inverting input of U2C connects, the first end ground connection of the 25th resistance R25, and the second of the 25th resistance R25
End is connect with the inverting input of the operational amplifier U2C.In this way, stable acquisition can be provided for operational amplifier U2C
Voltage and the collecting efficiency for improving voltage.
It should be noted that the high-voltage power circuit 10 further includes positive high voltage input unit 11, the positive high voltage input
The input terminal of unit 11 is connect with the PWM output signal, output end and the positive high voltage of the positive high voltage input unit 11
The input terminal of oscillating unit 100 connects.Further, the positive high voltage input unit 11 includes the 17th resistance R17, the 18th
The 19th resistance R19 of resistance R18, the 20th resistance R20, the 22nd resistance R22, the first capacitance C1 and the first amplifier U2A,
One end of the 17th resistance R17 is grounded, and the other end is connect with the inverting input of the first amplifier U2A, and described the
One end of 20 resistance R20 is connect with the constant pressure source, and the other end is connect with the inverting input of the first amplifier U2A,
The first end of the 19th resistance R19 is connect with the PWM output signal, the second end of the 19th resistance R19 and institute
State the inverting input connection of the first amplifier U2A, in-phase input end and the High voltage output list of the first amplifier U2A
The output end connection of member, the output end of the first amplifier U2A shake after the 22nd resistance R22 with the positive high voltage
The input terminal connection of unit is swung, one end of the 18th resistance R18 and the inverting input of the first amplifier U2A connect
It connects, the other end of the 18th resistance R18 connects after the first capacitance C1 with the output end of the first amplifier U2A
It connects.In this way, the voltage signal of input positive high voltage oscillating unit can be stablized, and the output by the way that High voltage output unit is arranged is high
The in-phase input end of frequency voltage and the first amplifier U2A can allow the pwm signal of input with high by the output of High voltage output unit
Frequency voltage change, to ensure output positive high voltage in the range of setting, that is, ensure output positive high voltage -1500V~+
In the range of 5000V, and then the scope of application of power supply is improved, improves the output accuracy of high voltage power supply.
It should be noted that the high-voltage power circuit 10 further includes negative high voltage input unit 12, the negative high voltage input
The input terminal of unit 12 and the input terminal of constant pressure source connect, and output end and the negative high voltage of the negative high voltage input unit 12 shake
Swing the input terminal connection of unit 200.Further, the negative high voltage input unit 12 includes eleventh resistor R11, the 12nd electricity
Hinder R12, the 21st resistance R21, the 23rd resistance R23, the second capacitance C2 and the second amplifier U2B, the 11st electricity
One end of resistance R11 is connect with the constant pressure source, and the other end of the eleventh resistor R11 is anti-with the second amplifier U2B's
Phase input terminal connects, one end ground connection of the twelfth resistor R12, the other end of the twelfth resistor R12 and described second
The inverting input of amplifier U2B connects, the reverse phase of one end of the 21st resistance R21 and the second amplifier U2B
Input terminal connects, and the other end of the 21st resistance R21 is after the second capacitance C2 with the second amplifier U2B's
Output end connects, and the output end of the second amplifier U2B vibrates also after the 23rd resistance R23 with the negative high voltage
The input terminal of unit connects.In this way, the negative high voltage of input can be made more stable.
Compared with prior art, the present invention has at least the following advantages：
The high-voltage power circuit of the present invention is shaken positive high voltage oscillating unit and negative high voltage by the way that voltage superposition unit is arranged
High voltage power supply is exported after swinging the voltage superposition of unit, and the high-voltage feedback by exporting High voltage output unit to positive high voltage vibrates
The high voltage power supply that output is adjusted after unit, to improve the precision of power supply output so that the scope of application of power supply is wider, the high pressure
Power circuit precision is high, is not easy to be interfered by super-humid conditions, reliability higher.Simultaneously as this high-voltage power circuit is using essence
Degree is 1% resistance, the precision of power supply output is further improved, and the resistance value that the present invention uses is relatively low, compared to existing
In circuit for the resistance comprising multiple 180M Ω, the cost of product is reduced, the reliability of high-tension circuit is improved.The present invention is logical
Setting bypass resistance is crossed, the effect of partial pressure may be implemented, and realizes the voltage sample of positive high voltage output using difference amplifier, it can
It avoids using high level sampling resistor, improves sampling precision, reduce cost, reduce loss.Meanwhile it being exported in negative high voltage
Partial pressure sampling is carried out using bypass resistance, negative high voltage sampling resistor is saved, further reduces costs.The present invention is also provided with
Operation amplifier unit, that is, output current detection circuit are proportional to output by operational amplifier U2C through circuit computing acquisition
The voltage signal of electric current.
Specific embodiment is provided again below to illustrate present inventive concept：
In existing laser printer, bypass resistance R503, R504, R505 that positive high voltage oscillator passes through 3 15M Ω
It is connected to the output end of positive high voltage oscillator circuit, sample resistance R515, R519 of two 180M Ω are connected in series to operational amplifier
Negative-feedback end.TX high-voltage output circuits in the high-voltage power circuit of the application need to become in pwm signal duty ratio 0%-100%
The adjustable-voltage that -1500VDC arrives+5000VDC can be exported when change.There are two types of limiting cases：(1) as shown in figure 1 above, when 0%
When duty ratio inputs, carries 30uA, R515, R519 (360M Ω) for realization -1500V output band and require high value, R503, R504,
R505 (45M Ω) requires low resistance.(precision and cost increase, and power consumption can increase, the description seen below)；(2) when 100% accounts for
When sky is than input, adjustable high pressure generator exports maximum positive voltage+5000VDC, that R503, R504, R505 will bear 6500VDC
The pressure difference of (5000VDC+1500VDC), power attenuation is prodigious, while R503, R504, R505 are also required to use multiple resistance
It connects to share so big pressure difference (resistance that 3 resistance value 15M Ω power are 1W), so cost can also rise, simultaneously
PCB space area increases.
In order to allow design cost to be greatly lowered, and the precision of power supply output is improved, keeps the power supply scope of application wider,
Either when positive high voltage generator exports maximum voltage, need smaller power attenuation, R503, R504, R505 that should fit
Work as increasing；For the precision of raising output voltage, the resistance value of R515 and R519 should suitably reduce, and the above traditional circuit is all to have office
It is sex-limited and implacable.(1) positive high voltage and negative high voltage output are sampled, it is just high to be input to the direct feedback control of calculus of differences circuit
The linear convergent rate that pressure oscillator implementation specification book requires, the sampling element (resistance) on computing circuit periphery be both used for voltage sampling or
For realizing the fictitious load of negative voltage output, this measure can cancel the high value sample resistance of two 180M of original circuit.(2)
The output of current sampling circuit and the output of above-mentioned calculus of differences circuit are input to another computing circuit, realize patrolling for TX
Output is collected with load current into certain linear ratio relation.The high-voltage electricity for merging bypass resistance and sample resistance of this innovation
Road has well solved the above problem, the bypass resistance and operational amplifier that this circuit passes through merging positive high voltage oscillator output end
Negative-feedback sample resistance, so that original sample resistance is used the resistance compared with low resistance higher precision, and at the same time can make
For the bypass resistance of realization -1500V outputs.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of high-voltage power circuit, which is characterized in that including：Positive high voltage oscillating unit, negative high voltage oscillating unit, voltage superposition
Unit, positive high voltage voltage sampling unit, negative high voltage voltage sampling unit, differential amplification unit, High voltage output unit, load current
Sampling unit and operation amplifier unit,
The input terminal of the positive high voltage oscillating unit is connect with PWM output signal, the output end of the positive high voltage oscillating unit with
The first input end of the voltage superposition unit connects, and the input terminal of the negative high voltage oscillating unit and the input terminal of constant pressure source connect
It connects, the first output end of the negative high voltage oscillating unit is connect with the second input terminal of the voltage superposition unit, the voltage
The output end of superpositing unit exports high voltage power supply；
The input terminal of the positive high voltage voltage sampling unit is connect with the output end of the positive high voltage oscillating unit, the positive high voltage
The output end of voltage sampling unit is connect with the first input end of the differential amplification unit, and the of the negative high voltage oscillating unit
One output end is also connect with the input terminal of the negative high voltage voltage sampling unit, the output end of the negative high voltage voltage sampling unit
It is connect with the second input terminal of the differential amplification unit, the output end of the differential amplification unit and the High voltage output unit
Input terminal connection, the output end of the High voltage output unit connect with the input terminal of the positive high voltage oscillating unit；
The collection terminal of the load current sampling unit is connect with the second output terminal of the negative high voltage oscillating unit, the load
The output end of current sampling unit is connect with the current input terminal of the operation amplifier unit, the output of the High voltage output unit
End is also connect with the voltage input end of the operation amplifier unit, and the output end of the operation amplifier unit realizes that logic voltage is defeated
Go out.
2. high-voltage power circuit according to claim 1, which is characterized in that the voltage superposition unit includes first resistor
R1 and the 5th resistance R5, the first end of the first resistor R1 and the first voltage output end of the positive high voltage oscillating unit connect
It connects, the second end of the first resistor R1 is connect with the first end of the 5th resistance R5, the second end of the 5th resistance R5
It is connect with the first output end of the negative high voltage oscillating unit.
3. high-voltage power circuit according to claim 2, which is characterized in that the positive high voltage voltage sampling unit includes the
Three resistance R3, the first end of the 3rd resistor R3 and the connecting node of the first resistor R1 and the 5th resistance R5 connect
It connects, the second end of the 3rd resistor R3 is connect with the first input end of the differential amplification unit.
4. high-voltage power circuit according to claim 1, which is characterized in that the negative high voltage voltage sampling unit includes the
Four resistance R4, the 6th resistance R6 and the 9th resistance R9, first end and the negative high voltage oscillating unit of the 6th resistance R6
First voltage output end connects, the second end of the 6th resistance R6 after the 4th resistance R4 with the differential amplification unit
The second input terminal connection, one end of the 9th resistance R9 is connect with the second input terminal of the differential amplification unit, another
End ground connection.
5. high-voltage power circuit according to claim 1, which is characterized in that the differential amplification unit includes the 8th resistance
R8, third diode D3 and difference amplifier U1A, the plus earth of the third diode D3, the third diode D3's
Cathode is connect with the inverting input of the first end of the 8th resistance R8 and the difference amplifier U1A respectively, and the described 8th
The output end of the second end of resistance R8 and the difference amplifier U1A, the in-phase input end of the difference amplifier U1A with it is described
The output end of negative high voltage voltage sampling unit connects.
6. high-voltage power circuit according to claim 4, which is characterized in that the High voltage output unit includes two pole of voltage stabilizing
Pipe D4 and thirteenth resistor R13, the cathode of the zener diode D4 are connect with the output end of the difference amplifier U1A, institute
The anode for stating zener diode D4 is connect with the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13
Ground connection, the High voltage output unit are used to export positive high voltage signal by the anode of the zener diode D4.
7. high-voltage power circuit according to claim 1, which is characterized in that the load current sampling unit includes electric current
Resistance R27 is acquired, one end of the current acquisition resistance R27 is connect with the second output terminal of the negative high voltage oscillating unit, institute
The other end for stating current acquisition resistance R27 is connect with the current input terminal of the operation amplifier unit.
8. high-voltage power circuit according to claim 1, which is characterized in that the operation amplifier unit includes the 26th
Resistance R26, the 28th resistance and operational amplifier U2C, the first end of the 26th resistance R26 respectively with the high pressure
The output end of output unit is connected with the reverse input end of the operational amplifier U2C, and the second of the 26th resistance R26
End is connect with the output end of the operational amplifier U2C, in-phase input end and the load current of the operational amplifier U2C
The output end of sampling unit connects.
9. high-voltage power circuit according to claim 1, which is characterized in that the high-voltage power circuit further includes positive high voltage
The input terminal of input unit, the positive high voltage input unit is connect with the PWM output signal, the positive high voltage input unit
Output end is connect with the input terminal of the positive high voltage oscillating unit.
10. high-voltage power circuit according to claim 1, which is characterized in that the high-voltage power circuit further includes negative height
Input unit, the input terminal of the negative high voltage input unit and the input terminal of constant pressure source is pressed to connect, the negative high voltage input unit
Output end connect with the input terminal of the negative high voltage oscillating unit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111478557A (en) * | 2020-05-08 | 2020-07-31 | 中国人民解放军战略支援部队信息工程大学 | Negative high-voltage feedback power circuit |
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