CN209030098U - A kind of High-precision high-frequency high voltage power supply - Google Patents
A kind of High-precision high-frequency high voltage power supply Download PDFInfo
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- CN209030098U CN209030098U CN201821791740.1U CN201821791740U CN209030098U CN 209030098 U CN209030098 U CN 209030098U CN 201821791740 U CN201821791740 U CN 201821791740U CN 209030098 U CN209030098 U CN 209030098U
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Abstract
The utility model provides a kind of High-precision high-frequency high voltage power supply, and drive control unit includes PWM drive circuit and the voltage control circuit and current control circuit that are connected with PWM drive circuit；The input terminal of the voltage control circuit and current control circuit is connected with the voltage acquisition end of more voltage doubling rectifing circuits and current acquisition end respectively, the common output pulse width adjustment signal IC of output end to PWM drive circuit.Voltage control circuit and current control circuit include current/voltage translation circuit, signal tracking circuit, polarity of voltage selection circuit, instrument signal output isolation circuit and comparison circuit；Using the design of full analog circuit, and the output of PWM is controlled simultaneously using current control and voltage control, fast response time, it is high to control precision, simultaneously, the control output signal of sampled signal and current or voltage for input is effectively treated, the precision of the power supply further improved.
Description
Technical field
The utility model relates to high-frequency and high-voltage power supply technical field, in particular to a kind of High-precision high-frequency high voltage power supply.
Background technique
Direct current high-frequency and high-voltage power supply is mainly used in the equipment such as electric precipitation, detecting instrument, in the prior art, high-frequency and high-voltage
Power supply generally uses full-bridge inverting, step-up transformer and voltage multiplying rectifier to realize, wherein the output frequency of power supply is by PWM
Driving plate drives full bridge inverter to realize.
1) circuit design of existing most PWM driving plate has been all made of digital technology or intelligent chip technology, this
The design low-response of kind circuit can not achieve high-precision triggering effect；
2) single feedback function of the general only current or voltage of existing PWM driving, control precision be not also high；
3) it in the processing of voltage or the acquisition signal of electric current, without high-precision signal processing circuit, is controlled in voltage
In the output processing of signal or current controling signal, it is not directed to high-precision signal output processing circuit yet.
The overall accuracy that above-mentioned defect causes existing direct current high-frequency and high-voltage power supply is not high, system response speed is slow.
Summary of the invention
In order to solve the problems, such as described in background technique, the utility model provides a kind of High-precision high-frequency high voltage power supply, uses
The design of full analog circuit, and the output of PWM is controlled simultaneously using current control and voltage control, response speed
Fastly, control precision is high, meanwhile, the control output signal of sampled signal and current or voltage for input has carried out effective place
Reason, the precision of the power supply further improved.
In order to achieve the above object, the utility model is implemented with the following technical solutions:
A kind of High-precision high-frequency high voltage power supply, including it is sequentially connected to high frequency high-voltage output end by low-voltage direct input terminal
Full-bridge inverting unit, step-up transformer and more voltage doubling rectifing circuits；It further include the drive for being driven to full-bridge inverting unit
Dynamic control unit；The drive control unit includes PWM drive circuit.
The drive control unit further includes the voltage control circuit being connected with PWM drive circuit and current control electricity
Road；The input terminal of the voltage control circuit and current control circuit respectively with the voltage acquisition end of more voltage doubling rectifing circuits and
Current acquisition end is connected, the common output pulse width adjustment signal IC of output end to PWM drive circuit.
The voltage control circuit includes the first current/voltage translation circuit, the first signal tracking circuit, first voltage
Polarity selecting circuit, first instrument signal output isolation circuit and the first comparison circuit；Voltage from voltage acquisition end is adopted
Sample signal successively after the first current/voltage translation circuit, the first signal tracking circuit and first voltage polarity selecting circuit,
It exports all the way through first instrument signal output isolation circuit to voltage monitoring instrument, another way exports arteries and veins by the first comparison circuit
Rush width adjustment signal IC.
The current control circuit includes the second current/voltage translation circuit, second signal tracking circuit, second voltage
Polarity selecting circuit, second instrument signal output isolation circuit and the second comparison circuit；Electric current from current acquisition end is adopted
Sample signal successively by the second current/voltage translation circuit, second signal tracking circuit and second voltage polarity selecting circuit after,
It exports all the way through second instrument signal output isolation circuit to current monitoring instrument, another way exports arteries and veins by the second comparison circuit
Rush width adjustment signal IC.
The PWM drive circuit includes PWM controller, two-way high speed MOSTET driver and the first driving transformer
OT1 and the second driving transformer OT2, PWM controller input terminal receive from voltage control circuit and current control circuit
Pulse width adjustment signal IC, output end export two-way and trigger driving signal, pass through two-way high speed MOSTET driver output two
Road driving signal, via exporting four tunnel driving signals to complete after driving the first driving transformer OT1 and the second driving transformer OT2
Bridge inversion unit.
The output port of the PWM controller of the PWM drive circuit also exports the SLOPE for limiting slope change rate
Signal, SLOPE signal are respectively connected to the input terminal of current control circuit and voltage control circuit.
In the voltage control circuit, voltage acquisition signal is successively through the first current/voltage translation circuit, the first signal
Tracking circuit, the input terminal that the first comparison circuit is accessed after first voltage polarity selecting circuit, the first comparison circuit it is another
One input terminal SLOPE signal of the connection from PWM drive circuit and the voltage setting signal Prog_kV from potentiometer.
In the current control circuit, current acquisition signal is successively through the second current/voltage translation circuit, second signal
Tracking circuit, the input terminal that the second comparison circuit is accessed after second voltage polarity selecting circuit, the second comparison circuit it is another
One input terminal SLOPE signal of the connection from PWM drive circuit and the electric current setting signal Prog_mA from potentiometer.
In the voltage control circuit, the first signal tracking circuit also exports current correcting signal mA_Comp, institute simultaneously
The current correcting signal mA_Comp stated is connected to the input terminal of the second signal tracking circuit of the current control circuit.
In the voltage control circuit, first voltage polarity selecting circuit includes first voltage polarity selection wire jumper and the
One phase inverter is connected the positive terminal of first voltage polarity selection wire jumper by the signal that the first signal tracking circuit exports, separately all the way
The negative pole end for connecting first voltage polarity selection wire jumper after the first phase inverter all the way is led to by first voltage polarity selection wire jumper
Cross wire jumper selection output cathode end or negative pole end.
In the current control circuit, second voltage polarity selecting circuit includes second voltage polarity selection wire jumper and the
Two phase inverters are connected the positive terminal of second voltage polarity selection wire jumper by the signal of second signal tracking circuit output, separately all the way
The negative pole end for connecting second voltage polarity selection wire jumper after the second phase inverter all the way is led to by second voltage polarity selection wire jumper
Cross wire jumper selection output cathode end or negative pole end.
Compared with prior art, the utility model has the beneficial effects that
1, using the design of full analog circuit, fast response time；
Which 2, the output of PWM is controlled simultaneously using current control and voltage control, two-way IC signal, signal
Level drags down, i.e., is controlled by which, and two paths of signals level drags down simultaneously, then two-way controls simultaneously, and control precision is high；
3, it in the processing of the sampled signal of voltage and current, is acted on simultaneously using a variety of calibrating modes, ensure that sampling
The accuracy of signal reaches the high-precision effect of power supply；
4, control signal output processing on, if supply instrument output signal directly export, can in instrument
Portion's circuit constitutes circuit, influences the accuracy into the signal of comparison circuit, the output with instrument spacing output circuit to instrument
Signal carries out isolation processing and solves this problem in that；
5, PWM drive circuit feeds back to the SLOPE signal of voltage control circuit and current control circuit, can limit given
The slope maximum value and minimum value of signal carry out voltage-limiting protection to signal, prevent voltage overshoot and improve response speed.
Detailed description of the invention
Fig. 1 is the circuit structure block diagram of the utility model；
Fig. 2 is the voltage control circuit structural block diagram of the utility model；
Fig. 3 is the current control circuit structural block diagram of the utility model；
Fig. 4 is the PWM drive circuit structural block diagram of the utility model；
Fig. 5 is that the voltage control circuit of the utility model specifically designs circuit diagram；
Fig. 6 is that the current control circuit of the utility model specifically designs circuit diagram；
Fig. 7 is the PWM controller circuit diagram of the PWM drive circuit plate of the utility model；
Fig. 8 is the high speed MOSTET drive circuit figure of the PWM drive circuit plate of the utility model；
Fig. 9 is the full-bridge inverting element circuit figure of the utility model；
Figure 10 is the step-up transformer and more voltage doubling rectifing circuit figures of the utility model.
Wherein: the more voltage doubling rectifing circuit 4- drive control unit 5- of 1- full-bridge inverting unit 2- step-up transformer 3-
PWM drive circuit 6- current control circuit 7- voltage control circuit 8- the first current/voltage translation circuit the first signal of 9-
It tracks circuit 10- first voltage polarity and selects the first phase inverter of wire jumper 11- 12- first instrument signal output isolation circuit
13- the first comparison circuit 14- the second current/voltage translation circuit 15- potentiometer 2W3 16- second signal tracks circuit 17-
Second voltage polarity selection the second phase inverter of wire jumper 18- 19- second instrument signal output isolation circuit 20- second compares electric
Road.
Specific embodiment
Specific embodiment provided by the utility model is described in detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of High-precision high-frequency high voltage power supply, including by low-voltage direct input terminal to high frequency high-voltage output end
Sequentially connected full-bridge inverting unit 1, step-up transformer 2 and more voltage doubling rectifing circuits 3；It further include for full-bridge inverting unit
The drive control unit 4 driven；The drive control unit 4 includes PWM drive circuit 5.
The drive control unit 4 further includes the voltage control circuit 6 being connected with PWM drive circuit 5 and electric current control
Circuit 7 processed；The input terminal of the voltage control circuit 6 and current control circuit 7 voltage with more voltage doubling rectifing circuits 3 respectively
Collection terminal is connected with current acquisition end, the common output pulse width adjustment signal IC of output end to PWM drive circuit 5.
As shown in Fig. 2, the voltage control circuit 6 includes the first current/voltage translation circuit 8, the first signal trace
Circuit 9, first voltage polarity selecting circuit, first instrument signal output isolation circuit 12 and the first comparison circuit 13；First electricity
Pressure polarity selecting circuit includes that first voltage polarity selects wire jumper 10 and the first phase inverter 11, defeated by the first signal tracking circuit 9
Signal out connects the positive terminal of first voltage polarity selection wire jumper 10 all the way, and another way connects the after the first phase inverter 11
One polarity of voltage select wire jumper 10 negative pole end, by first voltage polarity selection wire jumper 10 by wire jumper selection output cathode end or
Negative pole end.Voltage sampling signal from voltage acquisition end successively passes through the first current/voltage translation circuit 8, the first signal
It is exported all the way through first instrument signal output isolation circuit 12 to voltage prison after tracking circuit 9 and first voltage polarity selecting circuit
Instrument is surveyed, another way passes through 13 output pulse width adjustment signal IC of the first comparison circuit.
As shown in figure 3, the current control circuit 7 includes the second current/voltage translation circuit 14, second signal tracking
Circuit 16, second voltage polarity selecting circuit, second instrument signal output isolation circuit 19 and the second comparison circuit 20；Second electricity
Pressure polarity selecting circuit includes second voltage polarity selection wire jumper 17 and the second phase inverter 18, and it is defeated to track circuit 16 by second signal
Signal out connects the positive terminal of second voltage polarity selection wire jumper 17 all the way, and another way connects the after the second phase inverter 18
Two polarity of voltages select wire jumper 17 negative pole end, by second voltage polarity selection wire jumper 17 by wire jumper selection output cathode end or
Negative pole end.Current sampling signal from current acquisition end successively passes through the second current/voltage translation circuit 14, second signal
After tracking circuit 16 and second voltage polarity selecting circuit, export all the way through second instrument signal output isolation circuit 19 to electric current
Measuring instrument, another way pass through 20 output pulse width adjustment signal IC of the second comparison circuit.
As shown in figure 4, the PWM drive circuit 5 includes PWM controller, two-way high speed MOSTET driver and first
Driving transformer OT1 and the second driving transformer OT2, PWM controller input terminal are received by voltage control circuit 6 and current control
Circuit 7 and come pulse width adjustment signal IC, output end export two-way trigger driving signal, pass through two-way high speed MOSTET drive
Dynamic device exports two-way driving signal, drives via four tunnels are exported after driving the first driving transformer OT1 and the second driving transformer OT2
Signal is moved to full-bridge inverting unit.
As shown in Figs 1-4, the output port of the PWM controller of the PWM drive circuit 5 is also exported for limiting slope
The SLOPE signal of change rate, SLOPE signal are respectively connected to the input terminal of current control circuit 7 and voltage control circuit 6.
As shown in Fig. 2, voltage acquisition signal successively converts electricity through the first current/voltage in the voltage control circuit 6
An input terminal of the first comparison circuit 13 is accessed after road 8, the first signal tracking circuit 9, first voltage polarity selecting circuit, the
Another input terminal SLOPE signal of the connection from PWM drive circuit 5 of one comparison circuit 13 and the voltage from potentiometer are set
Determine signal Prog_kV.
As shown in figure 3, current acquisition signal successively converts electricity through the second current/voltage in the current control circuit 7
An input terminal of the second comparison circuit 20 is accessed after road 14, second signal tracking circuit 16, second voltage polarity selecting circuit,
Another input terminal of second comparison circuit 20 connects SLOPE signal from PWM drive circuit 5 and from the electric current of potentiometer
Setting signal Prog_mA.
As Figure 2-3, in the voltage control circuit 6, the first signal tracking circuit 9 is gone back while exporting current correction
Signal mA_Comp, the current correcting signal mA_Comp are connected to the second signal tracking of the current control circuit 7
The input terminal of circuit 16.
As shown in figure 5, in figure, chip IC 2 is four road transports for the specific implementation circuit diagram of the voltage control circuit 6
Calculate amplifier LT1014, wherein 1-3 pin, 5-7 pin, 8-10 pin, 12-14 pin are respectively amplifier all the way, according to pin
Connection relationship is different, respectively constitutes signal tracking circuit, phase inverter, signal isolation circuit and comparator, the first electricity in Fig. 2
Stream/voltage conversion circuit 8 is connected and composed by resistance 1R1, resistance 1R2 and potentiometer 1W1, and the signal of the current forms of acquisition is turned
Become voltage signal form, the first signal tracking circuit 9 by resistance 1R4, potentiometer 1W2 and LT1014 (IC2) the first road transport
Put the signal tracking circuit of composition, wherein potentiometer 1W2 can also be adjusted according to the measured value of sampling monitoring point TP2, make to adopt
The signal value of sample end signal value and control circuit is consistent, and first voltage polarity selecting circuit includes polarity selection 10 He of wire jumper
First phase inverter 11, phase inverter are made of second group of amplifier of IC2, and first instrument signal output isolation circuit 12 is by the of IC2
Four groups of amplifiers are constituted, and sampled signal after processing needs to be divided into two-way, all the way for carrying out the monitoring of instrument, another way supply
Comparator is compared output with setting value, can be with the internal circuit of instrument if the output signal of supply instrument directly exports
Circuit is constituted, the accuracy into the signal of comparison circuit is influenced, to keep the control signal of output inaccurate, the utility model exists
The isolation circuit that output signal is increased at instrument output signal, solves this problem in that.First comparison circuit 13 is by the of IC2
The comparison circuit that three groups of amplifiers are constituted, the signal come from JUMP1 are directly given in first instrument output isolation circuit 12 all the way
No. 12 pins of IC2, another way are given to No. 9 pins of IC2 in the first comparison circuit 13 through resistance 1R13, and one as comparator
A input terminal, another input terminal (No. 10 pins of IC2) of comparator are SLOPE, Prog_ from external terminal U1-C
KV two paths of signals collectively forms, and output end (No. 8 pins of IC2) the output pwm control signal IC of comparator is connected to terminal U1-
On C.
As shown in fig. 6, be the current control circuit 7 specific implementation circuit diagram, the current control circuit 7 of Fig. 6 with
The voltage control circuit 6 of Fig. 5 is essentially identical, and introduction is not repeated herein, and only just different two o'clocks is illustrated, (1) electric current/electricity
The resistance of volt circuit is different with potentiometer parameter selection, sees Fig. 5 and Fig. 6, since the sampled signal of electric current and the sampling of voltage are believed
Number signal parameter it is different, so resistance 2R1, resistance 2R2 and the potentiometer 2W1 of the second current/voltage translation circuit 14 of Fig. 6
Resistance parameter selection it is different from Fig. 5.(2) signal value of the first signal tracking circuit 9 output of Fig. 5 is simultaneously as electricity
The correction signal mA_Comp of stream sampled signal processing is accessed by external terminal U2-4 by resistance 2R15 and potentiometer 2W3 15
Second signal tracks in No. 2 input pin of IC3 of circuit 16, the correction for handling current sampling signal.
As shown in fig. 7, SG3525 circuit has been public for the circuit diagram of PWM controller SG3525 in PWM drive circuit 5
The technology opened, is not described in detail here, and only input and output signal is described, and in figure, the signal of input is by terminal
U3-C and the IC signal come, access No. 1 pin of SG3525, IC signal by voltage control circuit 6 and current control circuit 7 simultaneously
Access, which signal level are dragged down, i.e., are controlled by which, and two paths of signals level drags down simultaneously, then the same time control of two-way
System, control precision are high.The output signal of SG3525 is A the and B trigger signal exported by 11 and No. 14 pins, while SG3525
No. 8 pins also export slope of the SLOPE signal to voltage control circuit 6 and current control circuit 7 for signal all the way and limit.
Fig. 8 be PWM drive circuit 5 two-way high speed MOSTET driver TC4420 implementing circuit figure, connection relationship with
Fig. 4 is identical, and description is not repeated herein.
Fig. 9 is the full bridge inverter figure of conventional four tunnels driving, by tetra- tunnel driving signal G1-S1, G2-S2 of Fig. 8 Zhong,
G3-S3, G4-S4 drive the full bridge inverter 1 being made of four IRF640, the output terminals A B of full bridge inverter 1
It is low-voltage direct output end with CD.
Figure 10 is that the power end AB and CD exported by full bridge inverter 1 has been sequentially connected step-up transformer 2 and times repoussage
Current circuit 3 (voltage doubling rectifing circuit is the prior art, is not described in detail here), final output high-frequency and high-voltage power supply.
Above embodiments are implemented under premised on technical solutions of the utility model, give detailed embodiment
With specific operating process, but the protection scope of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (7)
1. a kind of High-precision high-frequency high voltage power supply, including it is sequentially connected complete to high frequency high-voltage output end by low-voltage direct input terminal
Bridge inversion unit, step-up transformer and more voltage doubling rectifing circuits；It further include the driving for being driven to full-bridge inverting unit
Control unit；The drive control unit includes PWM drive circuit；
It is characterized in that, the drive control unit further includes the voltage control circuit and electricity being connected with PWM drive circuit
Flow control circuit；The input terminal of the voltage control circuit and current control circuit voltage with more voltage doubling rectifing circuits respectively
Collection terminal is connected with current acquisition end, the common output pulse width adjustment signal IC of output end to PWM drive circuit；
The voltage control circuit includes the first current/voltage translation circuit, the first signal tracking circuit, first voltage polarity
Selection circuit, first instrument signal output isolation circuit and the first comparison circuit；Voltage sample letter from voltage acquisition end
Number successively after the first current/voltage translation circuit, the first signal tracking circuit and first voltage polarity selecting circuit, all the way
It exports through first instrument signal output isolation circuit to voltage monitoring instrument, another way is wide by the output pulse of the first comparison circuit
Spend adjustment signal IC；
The current control circuit includes the second current/voltage translation circuit, second signal tracking circuit, second voltage polarity
Selection circuit, second instrument signal output isolation circuit and the second comparison circuit；Current sample letter from current acquisition end
Number successively after the second current/voltage translation circuit, second signal tracking circuit and second voltage polarity selecting circuit, all the way
It exports through second instrument signal output isolation circuit to current monitoring instrument, another way is wide by the output pulse of the second comparison circuit
Spend adjustment signal IC；
The PWM drive circuit include PWM controller, two-way high speed MOSTET driver and the first driving transformer OT1 with
Second driving transformer OT2, the pulse that PWM controller input terminal receives from voltage control circuit and current control circuit are wide
Adjustment signal IC is spent, output end exports two-way and triggers driving signal, exports two-way driving by two-way high speed MOSTET driver
Signal, via driving the first driving transformer OT1 and the second driving transformer OT2 after export four tunnel driving signals to full-bridge inverting
Unit.
2. a kind of High-precision high-frequency high voltage power supply according to claim 1, which is characterized in that the PWM drive circuit
The output port of PWM controller also export the SLOPE signal for limiting slope change rate, SLOPE signal is respectively connected to
The input terminal of current control circuit and voltage control circuit.
3. a kind of High-precision high-frequency high voltage power supply according to claim 1 or 2, which is characterized in that the voltage control
In circuit, voltage acquisition signal is successively through the first current/voltage translation circuit, the first signal tracking circuit, first voltage polarity
An input terminal of the first comparison circuit is accessed after selection circuit, another input terminal connection of the first comparison circuit comes from PWM
The SLOPE signal of driving circuit and voltage setting signal Prog_kV from potentiometer.
4. a kind of High-precision high-frequency high voltage power supply according to claim 1 or 2, which is characterized in that the current control
In circuit, current acquisition signal successively tracks circuit, second voltage polarity through the second current/voltage translation circuit, second signal
An input terminal of the second comparison circuit is accessed after selection circuit, another input terminal connection of the second comparison circuit comes from PWM
The SLOPE signal of driving circuit and electric current setting signal Prog_mA from potentiometer.
5. a kind of High-precision high-frequency high voltage power supply according to claim 1, which is characterized in that the voltage control circuit
In, the first signal tracking circuit also exports current correcting signal mA_Comp simultaneously, and the current correcting signal mA_Comp connects
It is connected to the input terminal of the second signal tracking circuit of the current control circuit.
6. a kind of High-precision high-frequency high voltage power supply according to claim 1, which is characterized in that the voltage control circuit
In, first voltage polarity selecting circuit includes first voltage polarity selection wire jumper and the first phase inverter, by the first signal trace electricity
The signal of road output connects the positive terminal of first voltage polarity selection wire jumper all the way, and another way connects the after the first phase inverter
One polarity of voltage selects the negative pole end of wire jumper, selects wire jumper to select output cathode end or cathode by wire jumper by first voltage polarity
End.
7. a kind of High-precision high-frequency high voltage power supply according to claim 1, which is characterized in that the current control circuit
In, second voltage polarity selecting circuit includes second voltage polarity selection wire jumper and the second phase inverter, tracks electricity by second signal
The signal of road output connects the positive terminal of second voltage polarity selection wire jumper all the way, and another way connects the after the second phase inverter
Two polarity of voltages select the negative pole end of wire jumper, select wire jumper to select output cathode end or cathode by wire jumper by second voltage polarity
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821791740.1U CN209030098U (en) | 2018-11-01 | 2018-11-01 | A kind of High-precision high-frequency high voltage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821791740.1U CN209030098U (en) | 2018-11-01 | 2018-11-01 | A kind of High-precision high-frequency high voltage power supply |
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| Publication Number | Publication Date |
|---|---|
| CN209030098U true CN209030098U (en) | 2019-06-25 |
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ID=66907811
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821791740.1U Active CN209030098U (en) | 2018-11-01 | 2018-11-01 | A kind of High-precision high-frequency high voltage power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149950A (en) * | 2018-11-01 | 2019-01-04 | 鞍山雷盛电子有限公司 | A kind of high-precision integrative high-frequency and high-voltage power supply |
-
2018
- 2018-11-01 CN CN201821791740.1U patent/CN209030098U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149950A (en) * | 2018-11-01 | 2019-01-04 | 鞍山雷盛电子有限公司 | A kind of high-precision integrative high-frequency and high-voltage power supply |
| CN109149950B (en) * | 2018-11-01 | 2024-02-06 | 鞍山雷盛电子有限公司 | High-precision integrated high-frequency high-voltage power supply |
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