CN205921523U - Positive and negative adjustable high voltage dc source of wide region - Google Patents
Positive and negative adjustable high voltage dc source of wide region Download PDFInfo
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- CN205921523U CN205921523U CN201620869380.7U CN201620869380U CN205921523U CN 205921523 U CN205921523 U CN 205921523U CN 201620869380 U CN201620869380 U CN 201620869380U CN 205921523 U CN205921523 U CN 205921523U
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Abstract
The utility model discloses a positive and negative adjustable high voltage dc source of wide region, including high voltage generator, negative high voltage end, positive high -pressure side, a drive circuit, first pressure regulating unit, current detection and amplifier circuit, the 2nd drive circuit, second pressure regulating unit that the order links to each other to and adjustable high voltage output end, still including continuous command input end, instruction voltage circuit, the error amplifier of order to and voltage feedback circuit. The utility model discloses a power by a pair of positive and negative adjustable high voltage DC of the positive and negative high voltage dc source production wide region output that has the fixed voltage value, therefore also can be produced the output of the positive and negative adjustable high voltage DC of the independent wide region of multichannel by the positive and negative high voltage DC reference source of sharing, the working range of the pressure regulating unit of two coordination works simultaneously can accurately voluntarily link up and coordinate, can not appear the invalid circulating current loss and the pressure regulating characteristic scheduling problem out of control that exist in the known technique to work efficiency is higher, the more level and smooth accuracy of voltage control characteristic.
Description
Technical field
This utility model is related to small-power electronic high voltage direct current source domain, is applied to laser printer particularly to one kind
The positive and negative adjustable high voltage D. C of wide scope.
Background technology
Need in the electronic equipments such as laser printer to use voltage wide range adjustable electronic high voltage DC source, generally this
Plant high-voltage DC power supply to be produced by a controlled electronic high voltage generator.In the equipment such as the laser printer in numerous species,
Need this high-voltage DC power supply of multichannel Independent adjustable, generally expired by multiple the independently-controlled electronic high voltage generators
Foot.Larger, the relatively costly element of high-tension transformer, high power transistor equal-volume must be used in electronic high voltage generator,
It is larger, relatively costly to there is volume in the multichannel Independent adjustable high-voltage DC power supply being therefore made up of multiple independent high tension generators
Shortcoming.
Reference paper [1] (a kind of high-voltage voltage-regulating circuit of zl 201210014420.6) and [2] (zl 201210014640.9
The multichannel high-voltage output circuit of common reference high-voltage power supply) provide that a kind of to produce multichannel by a shared high tension generator independent
The technical scheme of the adjustable high-voltage DC power supply of wide scope, has the outstanding advantages of small volume, low cost.In reference paper [1]
[2], in the wide scope voltage-regulating technique scheme providing, it is cooperatively configured by a series voltage-regulating link and a pressure regulation link in parallel
Series and parallel voltage regulating device, can be produced with a fixing high voltage reference source can the High voltage output that adjusts of wide scope.Using
Multiple series and parallel voltage regulating devices and a shared high tension generator can provide multichannel independence wide scope adjustable high pressure
Output.
But, realize in reference paper [1] and [2] disclosed series voltage-regulating link and pressure regulation link collaborative work in parallel
In high voltage adjusting technical scheme, series voltage-regulating link and pressure regulation link in parallel are directly controlled by controller, there is series voltage-regulating
The problem that the working range of link and pressure regulation link in parallel is difficult to accurately be connected.Ideal situation requires, in series voltage-regulating link
Transistor work when, the transistor in pressure regulation link in parallel should end, and during transistor work in pressure regulation link in parallel,
Transistor in series voltage-regulating link should end, and both should accurately be connected.There is discreteness in the parameter due to electronic component
With various deviations and drift, using reference paper [1] and technical scheme disclosed in [2] it is difficult to realize series voltage-regulating link and simultaneously
The preferable of the working range of joint debugging pressure ring section is accurately connected.If there is the transistor in series voltage-regulating link and relief frame in parallel
The situation that transistor in section works simultaneously, can be referred to as series voltage-regulating link and pressure regulation link working range in parallel is overlapping,
The circulation invalid to voltage-regulation can be formed, thus increasing the burden in common reference source and extra circuit loss in overlay region；
If there is the transistor in the transistor in series voltage-regulating link and pressure regulation link in parallel simultaneously by situation, can be referred to as
There is neutral gear, series voltage-regulating link and and joint debugging in neutral area between series voltage-regulating link and pressure regulation link working range in parallel
Pressure ring section all loses response it may appear that the of short duration out-of-control phenomenon of voltage to control signal, leads to voltage regulation properties unsmooth or non-
Linear problem.Meanwhile, reference paper [1] and technical scheme disclosed in [2] are only applicable to the high direct voltage to single polarity and carry out
Adjust and require it is impossible to meet the positive and negative adjustable high voltage D. C of wide scope needed for equipment such as many laser printers.
Utility model content
The purpose of this utility model is to overcome the shortcoming of prior art and deficiency, provides a kind of wide scope positive and negative adjustable height
Pressure DC source, using technical scheme provided by the utility model, can be by the positive or negative high voltage a pair with fixed voltage value
DC source (abbreviation high voltage reference source) produces wide scope positive and negative adjustable high direct voltage output, thus can also by shared just
Negative dc high voltage a reference source produces the positive and negative adjustable high direct voltage output of multichannel independence wide scope.Carried in this utility model simultaneously
For technical scheme in, the working range of the pressure regulation unit of two co-ordinations can automatic accurate linking and cooperation, will not go out
The problems such as present in existing known technology, invalid circulation loss and voltage adjustment characteristic are out of control, thus work efficiency is higher, voltage-regulation
Characteristic is more smooth accurately.
The purpose of this utility model is realized by following technical scheme:
A kind of positive and negative adjustable high voltage D. C of wide scope, including high-voltage generator, negative high-voltage end, positive high voltage end,
One drive circuit, the first pressure regulation unit, current detecting and amplifying circuit, the second drive circuit, the second pressure regulation unit and adjustable height
Pressure outfan；Also include command input, command voltage circuit, error amplifier and voltage feedback circuit；Its high voltage appearance is sent out
Raw device is connected with positive high voltage end and negative high-voltage end respectively, and positive high voltage end is connected with the input of the first pressure regulation unit, negative high-voltage end
It is connected with the input of the second pressure regulation unit, the outfan of the first pressure regulation unit is connected with each other with the outfan of the second pressure regulation unit
It is followed by adjustable high-voltage output end, the output of the first drive circuit terminates the drive end of the first pressure regulation unit, the first pressure regulation unit
Current detecting terminates the detection input of current detecting and amplifying circuit, and current detecting terminates the second drive with the output of amplifying circuit
The input on galvanic electricity road, the drive end of the output termination second pressure regulation unit of the second drive circuit；Command input, command voltage
Circuit, error amplifier are sequentially connected, and the outfan of error amplifier connects the input of the first drive circuit, Voltage Feedback electricity
The input on road connects the outfan of the first pressure regulation unit, the outfan of the second pressure regulation unit respectively, voltage feedback circuit defeated
Go out end to be connected with error amplifier.
Described first pressure regulation unit include m pnp transistor q1-1, q1-2 ... q1-m, m+1 resistance r1-0, r1-1,
R1-2 ... r1-m, and Zener d1-1；Also include input, outfan, current detecting end and drive end；Wherein m >=
1 and m is integer；The colelctor electrode of m pnp transistor and emitter stage are serially connected successively, the emitter stage of first transistor q1-1
Connect the anode of Zener d1-1, the negative electrode of Zener d1-1 connects a pole at the current detecting end of the first pressure regulation unit, electric current is examined
Another pole surveying end connects the input of the first pressure regulation unit, and the one of resistance r1-0 terminates the one of the drive end of the first pressure regulation unit
Individual pole, another pole of drive end is connected with the input of the first pressure regulation unit, another termination pnp transistor of resistance r1-0
The base stage of q1-1, the two ends of resistance r1-m connect base stage and the colelctor electrode of transistor q1-m respectively, and the colelctor electrode of transistor q1-m is also
It is connected with the outfan of the first pressure regulation unit, remaining m-1 resistance is connected across each base stage of m transistor being sequentially connected in series respectively
Between.
Described second pressure regulation unit include n npn transistor q2-1, q2-2 ... q2-n, n+1 resistance r2-0, r2-1,
R2-2 ... r2-n, and Zener d2-1；Also include input, outfan and drive end；Wherein n >=1 and n are integer；
The colelctor electrode of n npn transistor and emitter stage are serially connected successively, and the emitter stage of first transistor q2-1 connects Zener d2-1
Negative electrode, the anode of Zener d2-1 connects the input of the second pressure regulation unit, a termination second pressure regulation unit of resistance r2-0
One pole of drive end, another pole of drive end is connected with the input of the second pressure regulation unit, another termination of resistance r2-0
The base stage of npn transistor q2-1, the two ends of resistance r2-n connect base stage and the colelctor electrode of transistor q2-n respectively, transistor q2-n's
Colelctor electrode is also connected with the outfan of described second pressure regulation unit, and it is brilliant that remaining n-1 resistance is connected across n being sequentially connected in series respectively
Between each base stage of body pipe.
Described first drive circuit include a transistor q3-1 and 5 resistance r3-1, r3-2 ... r3-5；Also include defeated
Enter end and outfan；Wherein one end of the emitter stage connecting resistance r3-1 of transistor q3-1, another termination first of resistance r3-1 is driven
One pole of the input on galvanic electricity road, the base stage of transistor q3-1 is connected with one end of resistance r3-2 and r3-3 respectively, resistance r3-2
Connect the two poles of the earth of the input of the first drive circuit, the colelctor electrode connecting resistance of transistor q3-1 with the other end of resistance r3-3 respectively
One end of r3-4, a pole of the outfan of another termination first drive circuit of resistance r3-4, the two ends of resistance r3-5 respectively with
The two poles of the earth of the outfan of the first drive circuit are connected.
Described second drive circuit includes an a photo-coupler u4-1 and resistance r4-1；Also include input and output
End；One end of the anode connecting resistance r4-1 of the light emitting diode in photo-coupler u4-1, another termination second of resistance r4-1 is driven
One pole of the input on galvanic electricity road, the negative electrode of light emitting diode connects another pole of the input of the second drive circuit, photo-coupler
The two ends of the photosensitive tube in u4-1 are connected with the two poles of the earth of the outfan of the second drive circuit respectively.
Described current detecting and amplifying circuit include an a transistor q5-1 and resistance r5-1；Also include detection input
End and outfan；Wherein the emitter stage of transistor q5-1 and base stage respectively with current detecting and the detection input of amplifying circuit
The two poles of the earth are connected, and the colelctor electrode of transistor q5-1 connects a pole of current detecting and the outfan of amplifying circuit, outfan another
Pole connects reference point of potential, and the two ends of resistance r5-1 are connected with the base stage of transistor q5-1 and emitter stage respectively.
Described current detecting and amplifying circuit include an a photo-coupler u5-1 and amplifier a5-1, also include detecting
Input and outfan；The two ends of the light emitting diode in wherein photo-coupler u5-1 respectively with current detecting and amplifying circuit
The two poles of the earth of detection input are connected, and the two ends of the photosensitive tube in photo-coupler u5-1 connect two inputs of amplifier a5-1 respectively
End, two outfans of amplifier a5-1 are connected with the two poles of the earth of the outfan of amplifying circuit with current detecting respectively.
Described amplifier a5-1 adopts the proportional amplifier that operational amplifier lm324 is constituted.
A kind of control method of the positive and negative adjustable high voltage D. C of wide scope, the step comprising following order:
Step one: positive and negative high voltage is produced by high-voltage generator, delivers to positive high voltage end and negative high-voltage end respectively, just high
The magnitude of voltage of pressure side is higher than the higher limit of described wide scope positive and negative adjustable high voltage D. C output voltage range of accommodation, negative high voltage
The magnitude of voltage at end is less than the lower limit of described wide scope positive and negative adjustable high voltage D. C output voltage range of accommodation；
Step 2: the instruction of pwm voltage-regulation is sent into by command input；
Step 3: the instruction of pwm voltage-regulation is converted to by command voltage by command voltage circuit；
Step 4: command voltage is compared with the feedback voltage from voltage feedback circuit and is put by error amplifier
Greatly, and by operation result send into the first drive circuit, drive the first pressure regulation unit that voltage is adjusted by the first drive circuit
Section；
Step 5: detected the emitter stage electricity of pnp transistor q1-1 in the first pressure regulation unit by current detecting and amplifying circuit
Stream, and send into the second drive circuit after testing result is amplified, drive the second pressure regulation unit to participate in electricity by the second drive circuit
Pressure is adjusted；
The amplification of wherein current detecting and amplifying circuit should meet following condition:
The emitter current remembering pnp transistor q1-1 in the first pressure regulation unit is i1, its maximum is i1m, then:
Work as i1≥0.1i1mWhen, drive the npn transistor q2-1 in the second pressure regulation unit to be in cut-off state；
As 0 ＜ i1＜ 0.1i1mWhen, drive the npn transistor q2-1 in the second pressure regulation unit to enter amplification region, participate in voltage
Adjust；
Work as i1When=0, the emitter current of npn transistor q2-1 in the second pressure regulation unit is driven to reach its maximum；
Step 6: the output voltage of the positive and negative adjustable high voltage D. C of described wide scope is adopted by voltage feedback circuit
Sample simultaneously feeds back to error amplifier, is compared with command voltage, and controls output voltage to reach after error amplifier computing
Command request.
This utility model compared with prior art, has the advantage that and beneficial effect:
1st, the control method of power supply of the present utility model is assisted with push pull mode by the first pressure regulation unit and the second pressure regulation unit
With working, automatic partial pressure regulation is carried out to fixing positive or negative high voltage DC source, voltage can be obtained between positive high voltage value and negative height
Between pressure value, wide scope positive and negative continuously adjustable high direct voltage output, and have the advantages that loss is low, load capacity is strong；Meanwhile,
Because the second pressure regulation unit is to be driven according to the transistor operating current in the first pressure regulation unit, only in the first pressure regulation list
Transistor operating current in unit is sufficiently small, that is, transistor when will move out amplification region entrance cut-off region, in the second pressure regulation unit
Side enters amplification region by cut-off region, continues to complete voltage-regulation；Carry out when the transistor in the first pressure regulation unit returns to amplification region
During voltage-regulation, the transistor in the second pressure regulation unit exits voltage-regulation automatically into cut-off region.The first tune thus can be ensured
The working range of pressure unit and the second pressure regulation unit can automatic accurate be connected, it is to avoid because of the working range weight of two pressure regulation units
The folded invalid circulation loss leading to or because the working range of two pressure regulation units between exist the voltage regulation properties that neutral leads to
The deterioration of precision.
2nd, this utility model provides a kind of positive and negative adjustable high voltage D. C of wide scope, by two complementary pressure regulation units
Voltage-regulation is completed with push pull mode collaborative work, has that voltage adjusting range width, degree of regulation are high, exportable positive and negative continuously may be used
The advantages of high direct voltage of tune, efficiency high, load capacity are strong；
3rd, this utility model will be used for two complementation pressure regulation unit phases of pressure regulation by setting up current detecting with amplifying circuit
Mutual correlation gets up, and coordinates suitable control method it is ensured that the work model of two pressure regulation units working in complementary push-pull mode
Enclose automatic accurate linking, be prevented effectively from the invalid circulation loss that two pressure regulation cell operation overlapping ranges lead to, or work model
There is neutral between enclosing and lead to pressure regulating performance to deteriorate；
4th, this utility model can effectively prevent from leading to due to factors such as electronic devices and components parameter discrete and parameter drifts
The bad problem of two pressure regulation unit matching, simplifies component parameters screening and product parameters adjustment it is ensured that the concordance of product, temperature
Stability and long-time stability；
5th, adopt the technical scheme that this utility model provides, positive or negative high voltage benchmark can be provided by shared high tension generator
Source, produces the multichannel independently positive and negative adjustable High voltage output of wide scope by multigroup complementation pressure regulation unit；
6th, the strong applicability of the technical solution of the utility model, structure be simple, low cost, easy to implement.
Brief description
Fig. 1 is a kind of structural representation of the positive and negative adjustable high voltage D. C of wide scope described in the utility model；
Fig. 2 is the circuit diagram of the first pressure regulation unit of power supply described in Fig. 1；
Fig. 3 is the circuit diagram of the second pressure regulation unit of power supply described in Fig. 1；
Fig. 4 is the circuit diagram of the first drive circuit of power supply described in Fig. 1；
Fig. 5 is the circuit diagram of the second drive circuit of power supply described in Fig. 1；
Fig. 6 is the circuit diagram of the current detecting of power supply described in Fig. 1 and amplifying circuit；
Fig. 7 is the circuit diagram of the current detecting of power supply described in Fig. 1 and amplifying circuit；
Fig. 8 is a kind of structural representation of the positive and negative adjustable high voltage D. C of wide scope described in the utility model；
Fig. 9 is a kind of structural representation of the positive and negative adjustable high voltage D. C of wide scope described in the utility model；
Figure 10 is a kind of structural representation of the positive and negative adjustable high voltage D. C of wide scope described in the utility model.
Specific embodiment
With reference to embodiment and accompanying drawing, this utility model is described in further detail, but enforcement of the present utility model
Mode not limited to this.
Embodiment one
A kind of positive and negative adjustable high voltage D. C of wide scope, as shown in figure 1, include high-voltage generator 1, negative high-voltage end 2,
Positive high voltage end 3, the first drive circuit 8, the first pressure regulation unit 7, current detecting and amplifying circuit 6, the second drive circuit 5, second
Pressure regulation unit 4 and adjustable high-voltage output end 9；Wherein, high-voltage generator 1 is connected with positive high voltage end 3 and negative high-voltage end 2 respectively,
Positive high voltage end 3 is connected with the input of the first pressure regulation unit 7, and negative high-voltage end 2 is connected with the input of the second pressure regulation unit 4, the
The outfan of the outfan of one pressure regulation unit 7 and the second pressure regulation unit 4 is connected with each other and is followed by adjustable high-voltage output end 9, the first drive
Galvanic electricity road 8 output termination the first pressure regulation unit 7 drive end, the first pressure regulation unit 7 current detecting termination current detecting with
The input of output termination second drive circuit 5 of the detection input of amplifying circuit 6, current detecting and amplifying circuit 6, second
The drive end of the output termination second pressure regulation unit 4 of drive circuit 5.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in Fig. 2 the first pressure regulation unit therein comprises m pnp
Transistor q1-1, q1-2 ... q1-m, m are greater than or equal to 1 integer, m+1 resistance r1-0, r1-1, r1-2 ... r1-m, and
One Zener d1-1；The colelctor electrode of m pnp transistor and emitter stage are serially connected successively, and first transistor q1-1 sends out
Emitter-base bandgap grading connects the anode of Zener d1-1, and the negative electrode of Zener d1-1 meets of the current detecting end of described first pressure regulation unit
Pole, another pole at current detecting end connects the input of described first pressure regulation unit, described first tune of a termination of resistance r1-0
One pole of the drive end of pressure unit, another pole of drive end is connected with the input of described first pressure regulation unit, resistance r1-
The base stage of 0 another termination pnp transistor q1-1, the two ends of resistance r1-m connect base stage and the colelctor electrode of transistor q1-m respectively,
The colelctor electrode of transistor q1-m is also connected with the outfan of described first pressure regulation unit, remaining m-1 resistance be connected across respectively according to
Between each base stage of m transistor of secondary series connection.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in figure 3, the second pressure regulation unit therein comprises n npn
Transistor q2-1, q2-2 ... q2-n, n are greater than or equal to 1 integer, n+1 resistance r2-0, r2-1, r2-2 ... r2-n, and
One Zener d2-1；The colelctor electrode of n npn transistor and emitter stage are serially connected successively, and first transistor q2-1 sends out
Emitter-base bandgap grading connects the negative electrode of Zener d2-1, and the anode of Zener d2-1 connects the input of described second pressure regulation unit, resistance r2-0's
One pole of the drive end of the one described second pressure regulation unit of termination, another pole of drive end is defeated with described second pressure regulation unit
Enter end to connect, the base stage of another termination npn transistor q2-1 of resistance r2-0, the two ends of resistance r2-n meet transistor q2-n respectively
Base stage and colelctor electrode, the colelctor electrode of transistor q2-n is also connected with the outfan of described second pressure regulation unit, remaining n-1 electricity
Resistance is connected across between each base stage of n transistor being sequentially connected in series respectively.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in figure 4, the first drive circuit therein comprises a crystalline substance
Body pipe q3-1 and 5 resistance r3-1, r3-2 ... r3-5；One end of the emitter stage connecting resistance r3-1 of transistor q3-1, resistance r3-1
The input of described first drive circuit of another termination a pole, the base stage of transistor q3-1 respectively with resistance r3-2 and r3-3
One end connect, the other end of resistance r3-2 and r3-3 connects the two poles of the earth of the input of described first drive circuit, transistor respectively
One end of the colelctor electrode connecting resistance r3-4 of q3-1, the one of the outfan of described first drive circuit of another termination of resistance r3-4
Pole, the two ends of resistance r3-5 are connected with the two poles of the earth of the outfan of described first drive circuit respectively.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in figure 5, the second drive circuit therein comprises a light
A bonder u4-1 and resistance r4-1；One end of the anode connecting resistance r4-1 of the light emitting diode in photo-coupler u4-1, electricity
One pole of the input of described second drive circuit of another termination of resistance r4-1, the negative electrode of light emitting diode connects described second driving
Another pole of the input of circuit, the two ends output with described second drive circuit respectively of the photosensitive tube in photo-coupler u4-1
The two poles of the earth at end are connected.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in fig. 6, current detecting therein and amplifying circuit comprise
An one transistor q5-1 and resistance r5-1；The emitter stage of transistor q5-1 and base stage respectively with described current detecting and amplification
The two poles of the earth of the detection input of circuit are connected, and the colelctor electrode of transistor connects described current detecting and the outfan of amplifying circuit
One pole, another pole of outfan connects reference point of potential, two ends base stage and the emitter stage with transistor q5-1 respectively of resistance r5-1
It is connected.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in fig. 7, current detecting therein and amplifying circuit comprise
An one photo-coupler u5-1 and amplifier a5-1, the two ends of the light emitting diode in photo-coupler u5-1 respectively with described electricity
Stream detection is connected with the two poles of the earth of the detection input of amplifying circuit, and the two ends of the photosensitive tube in photo-coupler u5-1 connect respectively puts
Two inputs of big device a5-1, two outfans output with described current detecting and amplifying circuit respectively of amplifier a5-1
The two poles of the earth at end are connected；Amplifier a5-1 can be made up of known technology, the ratio that for example can be constituted using operational amplifier lm324
Example amplifier.
The positive and negative adjustable high voltage D. C of described wide scope, as shown in figure 1, it also includes command input 10, instruction electricity
Volt circuit 11, error amplifier 12 and voltage feedback circuit 13；Command input 10 connects the input of command voltage circuit 11, refers to
Make an input of the output termination error amplifier 12 of potential circuit 11, another input termination electricity of error amplifier 12
The outfan of pressure feedback circuit 13, the input of output termination first drive circuit 8 of error amplifier 12, voltage feedback circuit
13 input is connected with adjustable high-voltage output end 9；High-voltage generator 1, command voltage circuit 11, error amplifier 12 and electricity
Pressure feedback circuit 13 is all constituted using known technology, for example: high-voltage generator can adopt the structure such as high-tension transformer and transistor
Become high-frequency and high-voltage agitator, produce high-frequency ac high voltage power supply, more positive and negative DC high-voltage power supply is obtained by hf rectifier rectification；
Command voltage circuit can be made up of rc low pass filter and resistor voltage divider circuit；Error amplifier can adopt operational amplifier
The pi actuator that lm324 is constituted；Voltage feedback circuit can be using suitable resistor voltage divider circuit.
A kind of control method of the positive and negative adjustable high voltage D. C of wide scope, step is:
Step one: positive and negative high voltage is produced by high-voltage generator, delivers to positive high voltage end and negative high-voltage end respectively, just high
The magnitude of voltage of pressure side is higher than the higher limit of described wide scope positive and negative adjustable high voltage D. C output voltage range of accommodation, negative high voltage
The magnitude of voltage at end is less than the lower limit of described wide scope positive and negative adjustable high voltage D. C output voltage range of accommodation；
Step 2: the instruction of pwm voltage-regulation is sent into by command input；
Step 3: the instruction of pwm voltage-regulation is converted to by command voltage by command voltage circuit；
Step 4: command voltage is compared with the feedback voltage from voltage feedback circuit and is put by error amplifier
Greatly, and by operation result send into the first drive circuit, drive the first pressure regulation unit that voltage is adjusted by the first drive circuit
Section；
Step 5: detected the emitter stage electricity of pnp transistor q1-1 in the first pressure regulation unit by current detecting and amplifying circuit
Stream, and send into the second drive circuit after testing result is amplified, drive the second pressure regulation unit to participate in electricity by the second drive circuit
Pressure is adjusted；
The amplification of wherein current detecting and amplifying circuit should meet following condition:
The emitter current remembering pnp transistor q1-1 in the first pressure regulation unit is i1, its maximum is i1m, then:
Work as i1≥0.1i1mWhen, drive the npn transistor q2-1 in the second pressure regulation unit to be in cut-off state；
As 0 ＜ i1＜ 0.1i1mWhen, drive the npn transistor q2-1 in the second pressure regulation unit to enter amplification region, participate in voltage
Adjust；
Work as i1When=0, the emitter current of npn transistor q2-1 in the second pressure regulation unit is driven to reach its maximum；
Step 6: the output voltage of the positive and negative adjustable high voltage D. C of described wide scope is adopted by voltage feedback circuit
Sample simultaneously feeds back to error amplifier, is compared with command voltage, and controls output voltage to reach after error amplifier computing
Command request.
Embodiment two
As Fig. 8, in the present embodiment, the first pressure regulation unit is composed in series by 2 transistors, and the second pressure regulation unit is by 3
Transistor is composed in series, and current detecting adopts first scheme shown in Fig. 4 with amplifying circuit, and command voltage circuit is by rc low-pass filtering
Device and resistor voltage divider circuit are constituted, and error amplifier adopts the pi actuator that operational amplifier lm324 is constituted, voltage feedback circuit
It is made up of resistor voltage divider circuit；Additionally, having accessed a Zener between the outfan of the first pressure regulation unit and the second pressure regulation unit
Pipe d0-1, to increase by second high-voltage output end that there is fixed voltage difference with adjustable high pressure output end voltage value, with full
Foot application side demand；Increased resistance r2a-1 in the emitter circuit of the transistor q2-1 in the second pressure regulation unit, to improve
The control characteristic of the second pressure regulation unit；Remainder is all identical with embodiment one.
Embodiment three
As Fig. 9, in the present embodiment, the first pressure regulation unit is composed in series by 3 transistors, and the second pressure regulation unit is by 4
Transistor is composed in series, and current detecting adopts alternative plan shown in Fig. 5 with amplifying circuit, and the first drive circuit employs and Fig. 3
Shown second drive circuit identical circuit, to adapt to higher positive high voltage output demand；Command voltage circuit, error are amplified
Device, voltage feedback circuit are all identical with second embodiment, in the emitter circuit of the transistor q2-1 in the second pressure regulation unit
Also increase resistance r2a-1；Remainder is all identical with embodiment one.
Example IV
As Figure 10, in the present embodiment, with a shared high tension generator with multigroup voltage regulation unit, can obtain
Obtain the positive and negative adjustable high direct voltage output of multichannel independence wide scope；The structure of wherein each voltage regulation unit all with embodiment one phase
With.
Above-described embodiment be this utility model preferably embodiment, but embodiment of the present utility model be not subject to above-mentioned
The restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace
Generation, combination, simplification, all should be equivalent substitute mode, are included within protection domain of the present utility model.
Claims (8)
1. a kind of positive and negative adjustable high voltage D. C of wide scope it is characterised in that: include high-voltage generator, negative high-voltage end, just
High-pressure side, the first drive circuit, the first pressure regulation unit, current detecting and amplifying circuit, the second drive circuit, the second pressure regulation unit
With adjustable high-voltage output end；Also include command input, command voltage circuit, error amplifier and voltage feedback circuit；Wherein
High-voltage generator is connected with positive high voltage end and negative high-voltage end respectively, and positive high voltage end is connected with the input of the first pressure regulation unit,
Negative high-voltage end is connected with the input of the second pressure regulation unit, the outfan of the outfan of the first pressure regulation unit and the second pressure regulation unit
It is connected with each other and be followed by adjustable high-voltage output end, the drive end of the output termination first pressure regulation unit of the first drive circuit, the first tune
The current detecting of pressure unit terminates the detection input of current detecting and amplifying circuit, the outfan of current detecting and amplifying circuit
Connect the input of the second drive circuit, the drive end of the output termination second pressure regulation unit of the second drive circuit；Command input,
Command voltage circuit, error amplifier are sequentially connected, and the outfan of error amplifier connects the input of the first drive circuit, electricity
The input of pressure feedback circuit connects the outfan of the first pressure regulation unit, the outfan of the second pressure regulation unit, Voltage Feedback respectively
The outfan of circuit is connected with error amplifier.
2. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described first pressure regulation unit
Including m pnp transistor q1-1, q1-2 ... q1-m, m+1 resistance r1-0, r1-1, r1-2 ... r1-m, and a Zener
Pipe d1-1；Also include input, outfan, current detecting end and drive end；Wherein m >=1 and m are integer；M pnp transistor
Colelctor electrode be serially connected successively with emitter stage, the emitter stage of first transistor q1-1 connects the anode of Zener d1-1, Zener
The negative electrode of pipe d1-1 connects a pole at the current detecting end of the first pressure regulation unit, and another pole at current detecting end connects the first pressure regulation
The input of unit, resistance r1-0 one termination the first pressure regulation unit drive end a pole, another pole of drive end with
The input of the first pressure regulation unit connects, the base stage of another termination pnp transistor q1-1 of resistance r1-0, the two ends of resistance r1-m
Connect base stage and the colelctor electrode of transistor q1-m respectively, the colelctor electrode of transistor q1-m is also connected with the outfan of the first pressure regulation unit
Connect, remaining m-1 resistance is connected across between each base stage of m transistor being sequentially connected in series respectively.
3. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described second pressure regulation unit
Including n npn transistor q2-1, q2-2 ... q2-n, n+1 resistance r2-0, r2-1, r2-2 ... r2-n, and a Zener
Pipe d2-1；Also include input, outfan and drive end；Wherein n >=1 and n are integer；The colelctor electrode of n npn transistor with send out
Emitter-base bandgap grading is serially connected successively, and the emitter stage of first transistor q2-1 connects the negative electrode of Zener d2-1, the anode of Zener d2-1
Connect the input of the second pressure regulation unit, the one of resistance r2-0 terminates a pole of the drive end of the second pressure regulation unit, drive end
Another pole is connected with the input of the second pressure regulation unit, the base stage of another termination npn transistor q2-1 of resistance r2-0, resistance
The two ends of r2-n connect base stage and the colelctor electrode of transistor q2-n respectively, the colelctor electrode of transistor q2-n also with described second pressure regulation list
The outfan of unit connects, and remaining n-1 resistance is connected across between each base stage of n transistor being sequentially connected in series respectively.
4. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described first drive circuit
Including a transistor q3-1 and 5 resistance r3-1, r3-2 ... r3-5；Also include input and outfan；Wherein transistor
One end of the emitter stage connecting resistance r3-1 of q3-1, a pole of the input of another termination first drive circuit of resistance r3-1, brilliant
The base stage of body pipe q3-1 is connected with one end of resistance r3-2 and r3-3 respectively, and the other end of resistance r3-2 and resistance r3-3 connects respectively
The two poles of the earth of the input of the first drive circuit, one end of the colelctor electrode connecting resistance r3-4 of transistor q3-1, resistance r3-4's is another
Terminate a pole of the outfan of the first drive circuit, two ends the two poles of the earth with the outfan of the first drive circuit respectively of resistance r3-5
It is connected.
5. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described second drive circuit
Including an a photo-coupler u4-1 and resistance r4-1；Also include input and outfan；Luminous in photo-coupler u4-1
One end of the anode connecting resistance r4-1 of diode, a pole of the input of another termination second drive circuit of resistance r4-1, send out
The negative electrode of optical diode connects another pole of the input of the second drive circuit, and the two ends of the photosensitive tube in photo-coupler u4-1 are respectively
It is connected with the two poles of the earth of the outfan of the second drive circuit.
6. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described current detecting with put
Big circuit includes an a transistor q5-1 and resistance r5-1；Also include detection input and outfan；Wherein transistor q5-
1 emitter stage is connected with the two poles of the earth of the detection input of amplifying circuit with current detecting respectively with base stage, transistor q5-1's
Colelctor electrode connects a pole of current detecting and the outfan of amplifying circuit, and another pole of outfan meets reference point of potential, resistance r5-1
Two ends be connected with the base stage of transistor q5-1 and emitter stage respectively.
7. according to claim 1 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described current detecting with put
Big circuit includes an a photo-coupler u5-1 and amplifier a5-1, also includes detection input and outfan；Wherein optocoupler
The two ends of the light emitting diode in clutch u5-1 are connected with the two poles of the earth of the detection input of amplifying circuit with current detecting respectively,
The two ends of the photosensitive tube in photo-coupler u5-1 connect two inputs of amplifier a5-1, two outputs of amplifier a5-1 respectively
End is connected with the two poles of the earth of the outfan of amplifying circuit with current detecting respectively.
8. according to claim 7 the positive and negative adjustable high voltage D. C of wide scope it is characterised in that: described amplifier a5-1 adopts
The proportional amplifier being constituted with operational amplifier lm324.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620869380.7U CN205921523U (en) | 2016-08-11 | 2016-08-11 | Positive and negative adjustable high voltage dc source of wide region |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620869380.7U CN205921523U (en) | 2016-08-11 | 2016-08-11 | Positive and negative adjustable high voltage dc source of wide region |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160417A (en) * | 2016-08-11 | 2016-11-23 | 惠州三华工业有限公司 | A kind of wide positive and negative adjustable high voltage D. C of scope and control method thereof |
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2016
- 2016-08-11 CN CN201620869380.7U patent/CN205921523U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160417A (en) * | 2016-08-11 | 2016-11-23 | 惠州三华工业有限公司 | A kind of wide positive and negative adjustable high voltage D. C of scope and control method thereof |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170201 Effective date of abandoning: 20181113 |