CN102545633A - Multipath high-voltage output circuit sharing reference high-voltage source - Google Patents
Multipath high-voltage output circuit sharing reference high-voltage source Download PDFInfo
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Abstract
The invention discloses a multipath high-voltage output circuit sharing a reference high-voltage source. The multipath high-voltage output circuit comprises a high-voltage converter and a plurality of high-voltage voltage regulation circuits, wherein a direct current input end is connected with the high-voltage converter and an output end of the high-voltage converter is simultaneously connected with the plurality of independent high-voltage voltage regulation circuits; and the plurality of the high-voltage voltage regulation circuits are used for adjusting high voltage which is input by the high-voltage converter to obtain a plurality of independent high-voltage outputs. Only one high-voltage converter needs to be shared, so that large-volume electric devices including a transformer, a high-power tube and the like are reduced and the whole volume of an applied product is greatly reduced; and therefore, the miniaturized design of the product is easier to realize and the multipath high-voltage output circuit has a higher cost advantage.
Description
Technical field
The present invention relates to the high voltage source technical field, relate in particular to multichannel output high pressure technique, specifically propose a kind of multichannel high-voltage output circuit of common reference high-voltage power supply.
Background technology
The high voltage source of existing multichannel output; Because output voltage is too high; Consider fail safe or actual production process factors such as safety; Generally be not employed on the transformer and do multichannel output with a plurality of windings; But the high voltage source on each road accomplishes with an independent high-voltage converter, and each high-voltage converter all comprises a cover high pressure magnetic element (like transformer), high-power components (like triode or FET), voltage multiplying rectifier element, high-voltage capacitance and feedback control element or the like basically, adopts the method mainly to have following defective:
1, need to use a plurality of independent high-voltage converters to realize a plurality of output high pressure, cost is high, and volume is big; Disturb big: because each high-voltage converter all comprises a cover high pressure magnetic element (like transformer), high-power components (like triode or FET), voltage multiplying rectifier element, high-voltage capacitance and feedback control element or the like basically; It is many more to import the used more at most component number of way, so cause the whole proposal cost too high, volume is big; Can not realize miniaturization Design; And each high-voltage converter is because the frequency of work is higher relatively, is easy to generate interference, EMC and complete machine electric property variation between mutually.
2, present high pressure voltage-regulating technique mainly is to adopt the independent series voltage-regulating or the method for parallelly connected pressure regulation traditionally, though this method also can realize exporting the transformation of high pressure, exists range of regulation narrow, and efficient is poor, requires the high shortcoming of input voltage:
1. for series voltage-regulating mode as shown in Figure 1, output voltage can not be realized the accent from 0V; For parallelly connected voltage regulating mode as shown in Figure 2, the maximum of output voltage can not be transferred to benchmark input voltage value Vmax (2200V).So, independent serial or parallel connection pressure regulation, all can't realize wide output voltage range (0V～Vmax), thus limited the scope of application of product;
2. conversion efficiency is low, owing to all will use resistance to come dividing potential drop, like the resistance R among the resistance R among Fig. 1 212, Fig. 2 203, has consumed a large amount of power on these two resistance;
3. for improving load capacity, require to provide higher Vmax voltage, as Fig. 1 or output voltage shown in Figure 2 be-during 1100V, the Vmax voltage of benchmark input voltage requirement use-2200V, and higher Vmax voltage also means higher cost and lower efficient.
3, prior art mainly adopts the high voltage stabilizing pipe to carry out conducting control, for the series voltage-regulating mode this method consume big and cost is higher, like the ZD201 among series voltage-regulating Fig. 1; ZD202; ZD203 all adopts the high voltage stabilizing pipe, and cost is high, and because voltage is too high; Have a spot of electric current to flow through all and can produce bigger consume, efficient is lower.
Summary of the invention
The objective of the invention is to overcome weak point of the prior art, a kind of multichannel high-voltage output circuit of common reference high-voltage power supply is provided, this circuit adopts a high-voltage converter can realize a plurality of output high pressure, and cost is lower, is easy to realize miniaturization Design.
The objective of the invention is to realize through following technical scheme:
The multichannel high-voltage output circuit of common reference high-voltage power supply; Comprise a high-voltage converter and a plurality of high pressure regulating circuit; The direct current input connects said high-voltage converter; The output of said high-voltage converter connects a plurality of separate high pressure regulating circuits simultaneously, and a plurality of high pressure regulating circuits obtain the separate high pressure output of multichannel with the high pressure of high-voltage converter input through regulating.
Particularly, said high-voltage converter comprises a high-tension transformer, switching tube and sinusoidal wave self-oscillation circuit and feedback loop thereof; Sinusoidal wave self-oscillation circuit by the band feedback loop provides stable sine wave signal driving switch pipe, makes the direct current of input produce sinusoidal variations, thereby converts reference voltage to through high-tension transformer.Reference voltage gets into a plurality of high pressure regulating circuits respectively, is converted to the output high pressure that receives the control of PWM duty cycle signals by a plurality of separate high pressure regulating circuits.
Said high pressure regulating circuit comprises operational amplifier, control element, series voltage-regulating link and parallelly connected pressure regulation link; Pwm control signal is input to the input of operational amplifier; The output of operational amplifier links to each other with parallelly connected pressure regulation link with the series voltage-regulating link respectively, wherein also is connected a control element between operational amplifier and the series voltage-regulating link and comes the series voltage-regulating link is carried out conducting control; Benchmark high-voltage power supply input output reference input voltage is to the series voltage-regulating link, and said series voltage-regulating link all is connected high-voltage output end with parallelly connected pressure regulation link.
The pwm control signal of input gets into after the operational amplifier signal processing from the operational amplifier inverting input; Get into series voltage-regulating link and parallelly connected pressure regulation link respectively from the output of operational amplifier; Pwm control signal after said series voltage-regulating link and parallelly connected pressure regulation link are handled according to operational amplifier carries out linear voltage regulation to the benchmark input voltage; Output high pressure after the pressure regulation is conducted to high-voltage output end, thereby has realized the Regulation Control of pwm control signal to the output high pressure.
Optimized technical scheme is: this high pressure regulating circuit also comprises a feedback circuit; Said feedback unit is situated between and is connected between high-voltage output end and the operational amplifier input; The voltage of high-voltage output end output also carries out feedback processing through feedback circuit, so that the high pressure of high-voltage output end output is stable.
Optimized technical scheme is: this high pressure regulating circuit also comprises a filter unit, and said filter unit is connected with the operational amplifier input, and the pwm control signal of input is input to the operational amplifier input through filter unit.Before operational amplifier was handled, filter unit at first carried out Filtering Processing to the pwm control signal of input, helped to improve the accuracy of follow-up pressure regulation operation.
Said control element is an optocoupler, the output of the input concatenation operation amplifier of said optocoupler, and the output of said optocoupler connects and the series voltage-regulating link.Use optocoupler to come the higher high voltage stabilizing pipe of displacement cost, make cost reduce, and avoid effectively producing bigger consume, thereby increase work efficiency.The feedback circuit of said high pressure regulating circuit comprises a resistance, and an end of said resistance connects high-voltage output end, other end concatenation operation amplifier.
Said control element can also comprise K TVS pipe of series connection, and the anode and the negative electrode of said K TVS pipe are connected each other; The number K of TVS pipe is mainly confirmed by input high-voltage value and TVS pipe breakdown voltage value.The output of operational amplifier connects the negative electrode of a diode, and the anode of said diode connects the base stage of a triode through a resistance, and the collector electrode of said triode connects first TVS pipe, said K TVS pipe connection series voltage-regulating link; Said feedback circuit comprises two resistance, and two resistor group become series arm, and an end of branch road is connected to high-voltage output end, other end ground connection, and simultaneously, the branch node between two resistance is connected to operational amplifier.
More specifically; Said series voltage-regulating link is made up of M triode and N triode respectively with parallelly connected pressure regulation link; The collector electrode of a said M triode is connected with emitter each other; The collector electrode of a said N triode is connected with emitter each other, and the M of said series voltage-regulating link triode series connection back is situated between and is connected between benchmark high-voltage power supply input and the high-voltage output end, and the load that is connect with high-voltage output end is in series; The N of a said parallelly connected pressure regulation link triode and be connected in earth terminal and high-voltage output end between, the load that is connect with high-voltage output end is in parallel.
The series voltage-regulating link makes that with mutually combining of parallelly connected pressure regulation link the output high pressure on every road is adjustable; Realize the range of regulation of broad; Even can be from the 0V accent; And all be applicable to the adjusting of positive and negative high pressure, the different application scenario that can use the output high pressure on or every road adjustable changed according to certain rules by the control of input signal at the output high pressure that requires every road;
When carrying out the negative high voltage adjusting; Said series voltage-regulating link adopts M NPN type triode to be composed in series; Annexation is that the emitter of first triode is connected to benchmark high-voltage power supply input, and its base stage is connected with the control end of control element, and the collector electrode of first triode connects the emitter of second triode; The collector electrode of second triode connects the emitter of the 3rd triode; By that analogy, the collector electrode of M-1 triode is connected to the emitter of M triode, and the collector electrode of M triode connects high-voltage output end;
And said parallelly connected pressure regulation link adopts N positive-negative-positive triode to be composed in series; Annexation is the voltage output end of the emitter concatenation operation amplifier of first triode; Its collector electrode connects the emitter of second triode, and the collector electrode of second triode connects the emitter of the 3rd triode, by that analogy; The collector electrode of N-1 triode connects the emitter of N triode, and the collector electrode of N triode is connected to high-voltage output end;
Just in time opposite when carrying out the positive high voltage adjusting, the series voltage-regulating link adopts M positive-negative-positive triode to be composed in series by above-mentioned annexation, and parallelly connected pressure regulation link adopts N NPN type triode to be composed in series by above-mentioned annexation.
About the number N of the triode of connecting in the triode number M of connecting in the series voltage-regulating link and the parallelly connected pressure regulation link, then decide according to the height of required regulation voltage voltage request with each triode trouble free service.
The present invention compares that prior art has the following advantages and beneficial effect:
1, owing to only uses a high-voltage converter to produce public benchmark high-voltage power supply; Need not use a plurality of independent high-voltage converters to realize a plurality of output high pressure; Thereby significantly reduced the number of the high-voltage converter during multichannel output is used; And reduced the use of related elements, like relatively costly components and parts such as high-tension transformer, high-power components, voltage multiplying rectifier element, high-voltage capacitance, feedback control elements, and the high pressure regulating circuit on each road among the present invention; Basically all only use the relatively low low-power transistor constant power element of price; Using optocoupler or TVS to manage simultaneously and replace relatively costly high voltage stabilizing pipe, make that the cost advantage of the present invention in global design is very obvious, is two kinds of schemes comparison on the material cost in a certain practical applications (calculating by the output of 4 road high pressure) below:
(1) by existing circuit arrangement:
The price of every road high-voltage converter: 5.328RMB is if there are 4 tunnel output, then price: 4 * 5.328=21.312RMB altogether;
(2) by circuit arrangement of the present invention:
The common price of using one road high-voltage converter (benchmark high-voltage power supply): 5.328RMB; Change out 4 the tunnel with 4 road high pressure regulating circuits more on this basis then and independently export high pressure:
The price of every road high pressure regulating circuit: 1.884RMB; 4 tunnel outputs: 1.884 * 4=7.536RMB, then total price: 5.328+7.536=12.864RMB.
Two kinds of schemes are compared, and average price descends: 21.312-12.864=8.448RMB, can practice thrift about 40% cost, so the present invention has outstanding cost advantage and economic benefit, and the many more advantages of output high pressure way are obvious more.
2, owing to only need a shared high-voltage converter, reduced the electric device of big volumes such as transformer, high power valve, genotron, high-voltage capacitance, the overall volume of applied product has greatly been reduced, thereby be prone to realize the miniaturization Design of product.
3, high-voltage converter operating frequency higher (general 20KHz more than) if when a plurality of high-voltage converter is worked together, interferes with each other easily, makes all variation of EMC performance and electric property, has also increased the complexity of circuit debugging; And the present invention is because a shared high-voltage converter; So can not produce mutual interference; Simultaneously because every road high pressure regulating circuit all is the occasion that is operated in direct current DC; Do not have the generation of high switching frequency,, make the circuit debugging process simple relatively yet so the relative prior art of product E MC and electric property all has bigger improvement.
4, the present invention adopts optocoupler or TVS to manage to control the adjustment link, can realize isolated controlling, and in the higher occasion of output voltage, low-cost and high efficiency advantage is more obvious.
5, adopt the pressure regulation method of series voltage-regulating link and the collaborative work of parallelly connected pressure regulation link dual mode, can realize the range of regulation of broad, can reduce input voltage, raise the efficiency effectively.
Description of drawings
Shown in Figure 1 is the circuit diagram of the series voltage-regulating mode of existing high pressure voltage-regulating technique
Shown in Figure 2 is the circuit diagram of the parallelly connected voltage regulating mode of existing high pressure voltage-regulating technique
Shown in Figure 3 is overall circuit frame diagram of the present invention
Shown in Figure 4 is the circuit diagram of high-voltage converter of the present invention
Shown in Figure 5 is the frame diagram of high pressure regulating circuit of the present invention
Shown in Figure 6 is the circuit diagram of high pressure regulating circuit embodiment one of the present invention
Shown in Figure 7 is the circuit diagram of high pressure regulating circuit embodiment two of the present invention
Embodiment
As shown in Figure 3; Generally speaking; The multichannel high-voltage output circuit of common reference high-voltage power supply of the present invention comprises a high-voltage converter and a plurality of high pressure regulating circuit, and the direct current input connects said high-voltage converter; The output of said high-voltage converter connects a plurality of separate high pressure regulating circuits simultaneously, and a plurality of high pressure regulating circuits obtain the separate high pressure output of multichannel with the high pressure of high-voltage converter input through regulating.
Fig. 4 shows the circuit diagram of said high-voltage converter, and said high-voltage converter mainly comprises a high-tension transformer 1, switching tube Q100, sinusoidal wave self-oscillation circuit 2 and feedback loop thereof; Said sinusoidal wave self-oscillation circuit 2 comprises an operational amplifier U100A; The output of said operational amplifier U100A connects the negative electrode of diode Z100; The anode of diode Z100 is crossed resistance R 103 is connected high-tension transformer 1 with resistance R 103 winding T100A; The winding T100A of high-tension transformer 1 is connected with collector electrode with the base stage of a switching tube Q100 respectively with winding T100B; The emitter of said switching tube Q100 is through resistance R 108 ground connection; The winding T100C of high-tension transformer 1 connects rectifier diode D100 and rectifier diode D101 respectively; The in-phase input end of operational amplifier U100A connects high-voltage output end (Vref) through a feedback resistance R105, by the sinusoidal wave self-oscillation circuit 2 of being with feedback loop stable sine wave signal driving switch pipe Q100 is provided, and makes the 25V direct current of input produce sinusoidal variations; Thereby convert reference voltage-1350V to through high-tension transformer T100 and rectifier diode D100, rectifier diode D101, reference voltage-1350V imports the high voltage input terminal of each high pressure regulating circuit respectively as the benchmark high-voltage power supply.
See Fig. 5, be the circuit frame figure of said high pressure regulating circuit, comprise operational amplifier 10, control element 11, series voltage-regulating link 12, parallelly connected pressure regulation link 13 and feedback circuit 14; The input concatenation operation amplifier 10 of pwm control signal, the output of operational amplifier 10 link to each other with parallelly connected pressure regulation link 13 with series voltage-regulating link 12 respectively, wherein also are connected a control element 11 between operational amplifier 10 and the series voltage-regulating link 12; The high voltage input terminal of coming from above-mentioned high-voltage converter connects series voltage-regulating link 12, and said series voltage-regulating link 12 all is connected high-voltage output end with parallelly connected pressure regulation link 13, and said high-voltage output end is also through a feedback circuit 14 concatenation operation amplifiers 10.
The pwm control signal of input is after filtering; Get into operational amplifier 10 inverting inputs; Get into series voltage-regulating link 12 and parallelly connected pressure regulation link 13 respectively from the output of operational amplifier 10; Collaborative regulating action through said series voltage-regulating link 12 and parallelly connected pressure regulation link 13; Make high pressure output changed according to certain rules by pwm control signal control, make the output high pressure stable, realize the control of pwm control signal output voltage through feedback circuit 14 control outputs.
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but execution mode of the present invention is not limited thereto.
Embodiment one
See Fig. 6; Be the circuit theory diagrams of high pressure regulating circuit according to the invention; Optocoupler PC200 is in the present embodiment as control element shown in Figure 5; The filter unit that pwm control signal input (K-Drpwm) is formed through resistance R 201, resistance R 202, capacitor C 200 and capacitor C 202 is connected to the inverting input (PIN2) of operational amplifier U200A; The normal phase input end of said operational amplifier U200A (PIN3) is through resistance R 217 ground connection, and its output (PIN1) connects parallelly connected pressure regulation link on the one hand; Connect the series voltage-regulating link indirectly through resistance R 208, optocoupler PC200 on the other hand, be specially resistance R 208 and be connected with the input of optocoupler PC200, the output of optocoupler PC200 connects high voltage input terminal respectively (1350V) with the series voltage-regulating link;
Particularly; The series voltage-regulating link comprises NPN type triode Q200, NPN type triode Q201, NPN type triode Q202, NPN type triode Q203, the NPN type triode Q204 of series connection; The emitter of triode Q200 is connected to high voltage input terminal, and its base stage is connected with the output of optocoupler PC200, and the emitter of triode Q201 is connected to the collector electrode of triode Q200; The emitter of triode Q202 be connected to triode Q201 collector electrode; The emitter of triode Q203 is connected to the collector electrode of triode Q202, the emitter of triode Q204 be connected to triode Q203 collector electrode, the collector electrode of triode Q204 is connected to high-voltage output end; Described NPN type triode (Q200, Q201, Q202, Q203, Q204) series connection is between benchmark high-voltage power supply-1350V input and high-voltage output end, and the load that is connect with high-voltage output end is a series relationship.
Parallel connection pressure regulation link comprises positive-negative-positive triode Q205, Q206, Q207, the Q208 of series connection; The emitter of triode Q208 is through the output of resistance R 215 one side concatenation operation amplifier U200A; On the other hand through resistance R 218 ground connection; Its collector electrode is connected to the emitter of triode Q207; The collector electrode of triode Q207 is connected to the emitter of triode Q206, and the collector electrode of triode Q206 is connected to the emitter of triode Q205, and the collector electrode of triode Q205 also is connected to high-voltage output end; Said positive-negative-positive triode (Q205, Q206, Q207, Q208) also is connected in the benchmark high-voltage power supply (1350V) between input and the high-voltage output end, the load that is connect with high-voltage output end is parallelly connected relation.
Its feedback circuit is a resistance R 200, and said resistance R 200 1 ends connect high-voltage output end, the inverting input (PIN2) of other end concatenation operation amplifier U200A;
Behind complete machine powering; From pwm control signal that amplitude is 5V of signal input end (K-Drpwm) input; If it is big that its duty ratio becomes; The voltage that then after filtering, inputs to the inverting input (PIN2) of operational amplifier U200A raises, and the resulting output voltage of its output (PIN1) just reduces;
On the one hand in the series voltage-regulating link; Reducing the series voltage-regulating link branch current that causes by the output voltage of amplifier U200A reduces; The primary edge electric current of optocoupler PC200 of also promptly flowing through diminishes; The CE pole tension of the secondary side of then said optocoupler PC200 raises, and make the conducting degree of triode Q200 strengthen, thereby the conducting degree of the triode Q201 of series connection with it, triode Q202, triode Q203, triode Q204 also strengthens; So the CE pole tension of each triode diminishes, make that the current potential and the reference voltage source of output high-pressure side are (1350V) approaching;
On the other hand in parallelly connected pressure regulation link; Because the output voltage of amplifier U200A reduces, through the electric current minimizing of triode Q208, triode Q208 is high-impedance state gradually to the cut-off region development; Its CE pole tension raises; The triode Q205 that connects with triode Q208, the CE pole tension of triode Q206 and triode Q207 also raises, and makes that output high-voltage value and reference voltage source are (1350V) approaching;
(1350V) approaching, resistance R 200 can make with the common negative-feedback circuit that forms of operational amplifier U200A and export high voltage control in a stationary value, realizes the control of duty cycle signals to output voltage thus along with output high pressure and reference voltage source.
On the contrary, if the pwm control signal duty ratio reduces, circuit will be an opposite course of work, and concrete operation principle is no longer discussed at this.
Because the triode that series voltage-regulating link and parallelly connected pressure regulation link are used has the characteristic of linearly variable resistance, when the complete conducting of the triode of series voltage-regulating link (being equivalent to resistance is 0), its output voltage the highest (Vmax); When the complete conducting of the triode of parallelly connected pressure regulation link (being equivalent to resistance is 0), output voltage minimum (0V) is so the present invention realizes wide range of regulation (0～Vmax) easily
From the above, the duty ratio of output voltage values and control signal is linear: (Vo is an output voltage values to Vo=Vmax * D, and D is a duty ratio; The maximum voltage value of Vmax for setting according to different application), the excursion of duty ratio is 0%～100%, when D=0%; Output voltage is 0V, has realized that 0V plays accent, in the present embodiment output voltage be-during 1100V; The input voltage that requires is merely-1350V, is significantly less than the input voltage-2200V among Fig. 1 or Fig. 2; Owing to there be not divider resistance R212 and divider resistance R203 before, efficient improves greatly simultaneously.
Embodiment two
Seeing Fig. 7, is another form of high pressure regulating circuit according to the invention, and the filter circuit in the present embodiment is made up of resistance R 201, resistance R 204, resistance R 206, adjustable resistance VR200, capacitor C 200, capacitor C 201 and capacitor C 202.
Control element then is composed in series by TVS pipe Z201, TVS pipe Z202 and TVS pipe Z203.
Pwm control signal input (K-Drpwm) is connected to the inverting input (PIN2) of operational amplifier U200A through filter circuit; The normal phase input end of said operational amplifier U200A (PIN3) ground connection, its output (PI N1) are connected parallelly connected pressure regulation link through resistance R 224 with TVS pipe Z205 on the one hand; Connect the series voltage-regulating link through control element on the other hand; The output (PIN1) that is specially operational amplifier U200A connects the negative electrode of diode Z204; The anode of diode Z204 is through the base stage of resistance R 215 connection triode Q205, and the emitter of triode Q205 connects the 18V voltages through resistance R 202, and its collector electrode connects the negative electrode that TVS manages Z203 through resistance R 213; The anode of TVS pipe Z203 connects the negative electrode of TVS pipe Z202; The anode of TVS pipe Z202 connects the negative electrode of TVS pipe Z201, and the anode of TVS pipe Z201 connects-1350 high voltage input terminal through resistance R 205 on the one hand, connects the series voltage-regulating link on the other hand;
Described series voltage-regulating link is identical with embodiment one with the formation of parallelly connected pressure regulation link; Do not add at this and to give unnecessary details; Between series voltage-regulating link and-1350 high voltage input terminal, also be in series with TVS pipe Z200, between the output of operational amplifier U200A and parallelly connected pressure regulation link, also be in series with TVS and manage Z205;
Feedback circuit in the present embodiment comprises resistance R 200 and resistance R 216, the inverting input of an end concatenation operation amplifier U200A of resistance R 200 and resistance R 216, the other end ground connection of resistance R 216.
Behind complete machine powering; From pwm control signal that amplitude is 5V of signal input end (K-Drpwm) input, if the duty ratio of pwm control signal strengthens, the voltage of inverting input (PIN2) that then after filtering, inputs to operational amplifier U200A is also high more; The resulting output voltage of its output (PIN1) is just low more; Because the output voltage of amplifier U200A reduces, it is big that the base current of triode Q205 becomes, and it is big that its conducting degree becomes; Then the electrorheological of the pipe of the TVS through reverse-conducting Z203, Z202, Z20 is big; Thereby the base current of triode Q200 increases, and its conducting degree strengthens, thereby the conducting degree of the triode Q201 of series connection with it, triode Q202, triode Q203 and triode Q204 also strengthens; So the CE utmost point voltage of each triode reduces, make that the current potential and the reference voltage source of output high-pressure side are (1350V) approaching; When the complete conducting of triode (being equivalent to resistance is 0), its output voltage is the highest;
On the other hand, because the output voltage of operational amplifier U200A output (PIN1) reduces, the electric current of the TVS that flows through pipe Z205 diminishes; The conducting degree of triode Q209 diminishes; The CE pole tension of triode Q209 raises, thus the triode Q208 that connects with triode Q208, triode Q206; The CE pole tension of triode Q207 raises, and makes that the output high-voltage value is approaching to reference voltage source (1350).
On the contrary, if the pwm control signal duty ratio reduces, circuit will be an opposite course of work, and concrete operation principle is no longer discussed at this.
From the above, the duty ratio of output voltage values and control signal is linear in the present embodiment: Vo=Vmax * D (Vo is an output voltage values, and D is a duty ratio, the maximum voltage value of Vmax for setting according to different application).
Need to prove; The foregoing description has only been explained structure and the operation principle when the present invention is used for the negative high voltage adjusting; Because the present invention also is applicable to positive high voltage and regulates that when being used for the positive high voltage adjusting, the series voltage-regulating link adopts the collector electrode and the emitter of positive-negative-positive triode to be composed in series; Parallel connection pressure regulation link then adopts the collector electrode and the emitter of NPN type triode to be composed in series; TVS pipe among the embodiment two needs polarity inversion to connect simultaneously, and the feedback signal of high pressure regulating circuit inserts the in-phase input end of operational amplifier, and other structures connect, operation principle is all same as the previously described embodiments.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. the multichannel high-voltage output circuit of common reference high-voltage power supply; It is characterized in that: comprise a high-voltage converter and a plurality of high pressure regulating circuit; The direct current input connects said high-voltage converter; The output of said high-voltage converter connects a plurality of separate high pressure regulating circuits simultaneously, and a plurality of high pressure regulating circuits obtain the separate high pressure output of multichannel with the high pressure of high-voltage converter input through regulating.
2. the multichannel high-voltage output circuit of common reference high-voltage power supply according to claim 1 is characterized in that: said high-voltage converter comprises a high-tension transformer, switching tube, sinusoidal wave self-oscillation circuit and feedback loop thereof; Said sinusoidal wave self-oscillation circuit comprises an operational amplifier; The output of said operational amplifier connects first winding that connects high-tension transformer through diode; First winding of high-tension transformer is connected with collector electrode with the base stage of a switching tube respectively with second winding; The emitter of said switching tube passes through grounding through resistance; The tertiary winding of high-tension transformer connects first rectifier diode and second rectifier diode respectively, and the in-phase input end of operational amplifier connects high-voltage output end through a feedback resistance.
3. the multichannel high-voltage output circuit of common reference high-voltage power supply according to claim 1 and 2 is characterized in that: said high pressure regulating circuit comprises operational amplifier, control element, series voltage-regulating link and parallelly connected pressure regulation link; Pwm control signal is input to the input of operational amplifier; The output of operational amplifier links to each other with parallelly connected pressure regulation link with the series voltage-regulating link respectively, wherein also is connected a control element between operational amplifier and the series voltage-regulating link and comes the series voltage-regulating link is carried out conducting control; Benchmark high-voltage power supply input output reference input voltage is to the series voltage-regulating link, and said series voltage-regulating link all is connected high-voltage output end with parallelly connected pressure regulation link.
4. the multichannel high-voltage output circuit of common reference high-voltage power supply according to claim 3 is characterized in that: said high pressure regulating circuit also comprises a feedback circuit, and said feedback unit is situated between and is connected between high-voltage output end and the operational amplifier input.
5. high pressure regulating circuit according to claim 4; It is characterized in that: this high pressure regulating circuit also comprises a filter unit; Said filter unit is connected with the operational amplifier input, and the pwm control signal of input is input to the operational amplifier input through filter unit.
6. the multichannel high-voltage output circuit of common reference high-voltage power supply according to claim 5; It is characterized in that: said control element is an optocoupler; The output of the input concatenation operation amplifier of said optocoupler, the output of said optocoupler connects high voltage input terminal and series voltage-regulating link respectively; The feedback circuit of said high pressure regulating circuit comprises a resistance, and an end of said resistance connects high-voltage output end, other end concatenation operation amplifier.
7. the multichannel high-voltage output circuit of common reference high-voltage power supply according to claim 5 is characterized in that: said control element comprises K TVS pipe of series connection, and the anode and the negative electrode of said K TVS pipe are connected each other; The output of operational amplifier connects the negative electrode of a diode, and the anode of said diode connects the base stage of a triode through a resistance, and the collector electrode of said triode connects first TVS pipe, said K TVS pipe connection series voltage-regulating link; Said feedback circuit comprises two resistance, and two resistor group become series arm, and an end of branch road is connected to high-voltage output end, other end ground connection, and simultaneously, the branch node between two resistance is connected to operational amplifier.
8. according to each described high pressure regulating circuit of claim 1 to 7; It is characterized in that: said series voltage-regulating link is made up of M triode and N triode respectively with parallelly connected pressure regulation link; The collector electrode of a said M N triode is connected with emitter each other; The collector electrode of a said N triode is connected with emitter each other, and the M of said series voltage-regulating link triode series connection back is situated between and is connected between benchmark high-voltage power supply input and the high-voltage output end, and the load that is connect with high-voltage output end is in series; The N of a said parallelly connected pressure regulation link triode and be connected in earth terminal and high-voltage output end between, the load that is connect with high-voltage output end is in parallel.
9. high pressure regulating circuit according to claim 8 is characterized in that: when carrying out the negative high voltage adjusting, said series voltage-regulating link adopts M NPN type triode to be composed in series; Said parallelly connected pressure regulation link adopts N positive-negative-positive triode to be composed in series.
10. high pressure regulating circuit according to claim 9 is characterized in that: when carrying out the positive high voltage adjusting, said series voltage-regulating link adopts M positive-negative-positive triode to be composed in series; Said parallelly connected pressure regulation link adopts N NPN type triode to be composed in series.
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| CN103916090A (en) * | 2013-01-07 | 2014-07-09 | 美国亚德诺半导体公司 | Multiple winding transformer coupled amplifier |
| CN105305832A (en) * | 2015-10-13 | 2016-02-03 | 惠州三华工业有限公司 | Circuit for realizing multi-path positive and negative high-voltage output |
| 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 |
| CN112927986A (en) * | 2021-02-01 | 2021-06-08 | 贵州天义电器有限责任公司 | Isolation solid relay circuit based on three-winding transformer |
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