CN202150804U - AC adjustable special-purpose power supply for electric power measuring - Google Patents
AC adjustable special-purpose power supply for electric power measuring Download PDFInfo
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- CN202150804U CN202150804U CN201120353435U CN201120353435U CN202150804U CN 202150804 U CN202150804 U CN 202150804U CN 201120353435 U CN201120353435 U CN 201120353435U CN 201120353435 U CN201120353435 U CN 201120353435U CN 202150804 U CN202150804 U CN 202150804U
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Abstract
The utility model provides a microprocessor controlled, simple and reliable AC adjustable special-purpose power supply for electric power measuring, mainly relates to an AC/AC power supply converting means using a semiconductor device having a control electrode, and especially relates to a microprocessor controlled power supply converting means providing a linear adjustable sinusoidal AC voltage and current for a portable power electronic measuring instrument. The AC adjustable special-purpose power supply comprises a switch commutation unit, an input sampling unit, an output sampling unit, a control unit and a driving unit, the switch commutation unit is connected between an AC power supply and an AC load, and uses four switch devices having control electrodes and four diodes, and the switch devices commonly use a group of filtering inductor and filtering capacitor; the switch commutation unit is connected to the control unit through the input sampling unit and the output sampling unit; and the control unit is connected with the control electrodes of the four switch devices through the driving unit.
Description
Technical field
The utility model relates to the AC/AC electric power conversion apparatus of semiconductor device that a kind of application has the control utmost point, and what relate in particular to a kind of microprocessor control provides the adjustable sinusoidal voltage of linearity and the electric power conversion apparatus of electric current for the portable power electronic measuring instrument.
Background technology
Power measurement will be simulated power supply and the on-the-spot service conditions of electricity consumption, and linear adjustable sinusoidal voltage and electric current often will be provided on its measuring instrument.Existing AC/DC/DC/AC mode need be used transformer usually; And the capacity of transformer must satisfy the requirement of power output; The power supply of power measurement equipment needs the power output of 3-10kw usually; Not only weight is very big can to satisfy the transformer of demanded power output of 3-10kw, and makes transformer and need consume a large amount of non-ferrous metals and electrical sheet, and its manufacturing cost is also very high.Employing AC/AC converting means realizes boosting or the step-down pressure regulation is a kind of method commonly used.China's utility model patent " two buck/boost two-way AC chopper " (Chinese utility model patent ZL200610096870.9 utility model patent publication number CN1967993) discloses a kind of pair of buck/boost two-way AC chopper; Comprise by the parallelly connected power circuit that constitutes of the filter capacitor of an end ground connection and also comprise a buck/boost circuit and the 2nd buck/boost circuit with the ac sinusoidal voltage power supply; This utility model has solved electric current switching-over problem, can realize step-down or the AC/AC conversion of boosting.But, since the technical scheme of this utility model through with two DC/DC basically topology (buck/boost circuit) carry out parallel connection and obtain, receive the influence of buck/boost circuit structure, its circuit structure, especially its control circuit more complicated.
The utility model content
The purpose of the utility model is the adjustable power measurement power source special of simple and reliable interchange that a kind of microprocessor control will be provided; Solve the technical problem of AC/AC power conversion with new simple and reliable circuit structure, stable adjustable sinusoidal voltage and the electric current of output that provides for power measuring instrument.
The utility model solves the problems of the technologies described above the technical scheme that is adopted:
The adjustable power measurement power source special of a kind of interchange comprises switch convertor unit, input sample unit, output sampling unit, control unit and driver element, and described switch convertor unit is connected between AC power and the AC load.Described switch convertor unit adopts 4 switching device and 4 diodes with control utmost point, forms the class Buck-Boost circuit that comprises the mirror image brachium pontis; Shared one group of filter inductance of the switching device of said Buck-Boost circuit and filter capacitor.The anode of 4 diodes and negative electrode be the negative electrode and the anode of 4 switching devices of reverse parallel connection to first to fourth respectively; The anode of first switching device and second switch device constitutes the input of switch convertor unit, is connected respectively to the two ends of input ac power; The negative electrode of the 3rd switching device and the 4th switching device is connected respectively to the two ends of filter capacitor, constitutes the output of switch convertor unit, is connected respectively to the two ends of output AC load; The negative electrode of first switching device is connected to the anode of the 3rd switching device and an end of filter inductance element, and the negative electrode of second switch device is connected to the anode of the 4th switching device and the other end of filter inductance element.Said switch convertor unit is connected to and described control unit through said input sample unit and output sampling unit; Said control unit is connected to the control utmost point of said 4 switching devices through described driver element.
A kind of preferable technical scheme of the interchange of the utility model is adjustable power measurement power source special is that said control unit adopts the microprocessor program control unit, comprises memory, IO interface circuit, AD converter and the PWM output unit of microprocessor, storage data and the control program of executive control program; The input of said control unit comprises digital signal input end and input end of analog signal; Said digital signal input end is connected to microprocessor through the IO interface circuit; Said input end of analog signal is connected to microprocessor through AD converter, wherein has at least an input end of analog signal to be connected with the output voltage regulating element; Said PWM output unit comprises 4 road PWM modules at least, and microprocessor connects described driver element through the PWM module.
A kind of better technical scheme of the interchange of the utility model is adjustable power measurement power source special is that said output sampling unit comprises voltage sampling circuit and voltage zero-crossing detection circuit; The input of voltage sampling circuit is connected the output of said switch convertor unit, and the output of voltage sampling circuit is connected to the input end of analog signal of said control unit; The output of switch convertor unit is connected to the digital signal input end of said control unit through voltage zero-crossing detection circuit.
The another kind of better technical scheme of the interchange of the utility model is adjustable power measurement power source special is that said current sampling unit comprises current sampling circuit and current over-zero testing circuit; Current sampling circuit is connected on the input of said switch convertor unit, and the output of current sampling circuit is connected to the digital signal input end of said control unit through the current over-zero testing circuit.
A kind of improved technical scheme of the interchange of the utility model is adjustable power measurement power source special is that the external signal that the output of said voltage zero-crossing detection circuit and current over-zero testing circuit is connected to said microprocessor is caught input, and microprocessor utilization rising/trailing edge is caught the phase place of judging voltage and current.
The further improved technical scheme of the interchange of the utility model is adjustable power measurement power source special is that said driver element comprises high-pressure side suspension drive circuit and optic coupling element, is connected to the control utmost point of said switching device after the output of said control unit is isolated through optic coupling element and high-pressure side suspension drive circuit two-stage.
The beneficial effect of the utility model is:
The interchange of the utility model is adjustable, and the power measurement power source special adopts fully-controlled type switching device topological structure, and output transformer is not adopted in output, and it is long-pending little in light weight to adapt to perceptual load, does not consume non-ferrous metal, is particularly suitable for portable equipment and uses.The interchange of the utility model is adjustable, and the power measurement power source special can be used for the inductive load of big electric current, has reliability and sinusoidal waveform preferably preferably.
Shared one group of filter inductance and filter capacitor are compared with disclosed pair of buck/boost two-way AC chopper of prior art, have omitted one group of filter inductance and filter capacitor, make circuit topological structure simpler.The utility model on the basis of improving reliability and reducing cost, has kept the repertoire of prior art scheme through change of circuit key element and omission.Because filter inductance and filter capacitor element are operated in the operating state of high voltage, high-frequency, big electric current in the AC/AC translation circuit, omit filter inductance and filter capacitor and not only can reduce cost, can also improve reliability.
Utilize and adopt the microprocessor program control unit to solve AC/AC supply convertor switching device change of current control circuit complicated technology problem; According to the in good time control switch device of the phase difference of voltage and current; Make its conducting and closing on request in sine wave period; Realize pressure regulation through change in duty cycle; Make supply convertor in certain input voltage range, can both export stable sinusoidal voltage and electric current, when simplifying the circuit hardware structure, satisfy the requirement of power measurement equipment and other fields adjustable ac source stability and reliability.
Description of drawings
Fig. 1 is the topological structure electrical schematic diagram of the adjustable power measurement power source special of the interchange of the utility model;
Fig. 2 is switching device drive signal waveform figure;
The working state schematic representation of the switch convertor unit of Fig. 3 type of being Buck-Boost circuit;
Fig. 4 is the electrical schematic diagram of the microprocessor program control unit of the adjustable power measurement power source special of the interchange of the utility model;
Fig. 5 is the electrical schematic diagram of voltage zero-crossing detection circuit;
Fig. 6 is the oscillogram of voltage zero-crossing detection circuit;
Fig. 7 is the electrical schematic diagram of current sampling circuit and current over-zero testing circuit;
Fig. 8 is the oscillogram of current sampling circuit and current over-zero testing circuit;
Fig. 9 is the timing waveform figure of the adjustable PWM of timer interruption generating.
Figure 10 is the electrical schematic diagram of driver element;
Embodiment
In order to understand the technique scheme of the utility model better, describe in detail further below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the topological structure electrical schematic diagram of an embodiment of the adjustable power measurement power source special of the interchange of the utility model; Comprise switch convertor unit 10, input sample unit 20, output sampling unit 30, control unit 40 and driver element 50; Switch convertor unit 10 is connected between AC power AC and the AC load; The switch convertor unit adopts 4 switching device and 4 diodes with control utmost point, forms the class Buck-Boost circuit that comprises the mirror image brachium pontis; The shared one group of filter inductance L of switching device S1 to S4 and the filter capacitor C of class Buck-Boost circuit; The anode of 4 diodes and negative electrode be negative electrode and the anode of 4 switching device S1 to S4 of reverse parallel connection to first to fourth respectively; The anode of the first switching device S1 and second switch device S2 constitutes the input of switch convertor unit 10, is connected respectively to the two ends of input ac power AC; The negative electrode of the 3rd switching device S3 and the 4th switching device S4 is connected respectively to the two ends of filter capacitor C, constitutes the output of switch convertor unit 10, is connected respectively to the two ends of output AC load; The negative electrode of the first switching device S1 is connected to the anode of the 3rd switching device S3 and the end of filter inductance element L, and the negative electrode of second switch device S2 is connected to the anode of the 4th switching device S4 and the other end of filter inductance element L.Switch convertor unit 10 is connected to and control unit 40 through input sample unit 20 and output sampling unit 30; Control unit 40 is connected to the control utmost point of 4 switching devices through driver element 50.
In the present embodiment, S1, S2, S3, S4 adopt four IGBT (insulated gate bipolar transistor), and wherein S1, S3 also can form with an IGBT module of connecting respectively with S2, S4.Equally, 4 switching devices also can adopt the semiconductor switch device of power MOSFET or other control pole cut-off.The anode of switching device is corresponding to the collector electrode of IGBT or the drain electrode of MOSFET in the utility model, and negative electrode is corresponding to the emitter of IGBT or the source electrode of MOSFET, and the control utmost point is corresponding to gate pole or the grid of IGBT or MOSFET.
Similar shown in Figure 1 is in buck Buck-Boost circuit is carried out mirror image; Increase a brachium pontis; Simultaneously the diode among the Buck-Boost is substituted with the switching device that has the inverse parallel diode, in the utility model with its type of being referred to as Buck-Boost circuit.The difficult point that this structure realizes is the change of current problem when alternating voltage zero-crossing, and in order to address this problem, can sample input Vi and output voltage V o when Vi＞Vo, make S2, S4 often open, S1, the complementation of S3 high frequency.When Vi＜Vo, S1, S3 often open, and S2, S4 high frequency are complementary.The switching drive signal of switching device is as shown in Figure 2.T0 to t1 during this period of time in, S2 and S4 often open, the electric current I L on the inductance maybe also maybe be less than zero greater than zero.Work as I
L＞0, when S1 opened, electric current was through the inverse parallel diode circulation of S1 and S2, and the inductance L energy storage is shown in Fig. 3 (a); When S1 closed, electric current released energy to load through the inverse parallel diode of S4 and S3, shown in Fig. 3 (b); Work as I
L＜0, when S3 closes, electric current through the inverse parallel diode of S2 and S1 to the power supply feedback energy, shown in Fig. 3 (c): when S3 opened, electric current released energy to load through the inverse parallel diode of S3 and S4, shown in Fig. 3 (d).But t1 obtains to the course of work similar analysis of t2 period circuit.
When circuit working duty ratio D greater than 0.5 situation under, this circuit can be realized boost function, and when duty ratio less than 0.5 the time, circuit can be realized buck functionality.Through output voltage being carried out sampling feedback control, the duty ratio of control circuit work just can provide stable adjustable sine-wave power output.
Suppose that switching tube is an ideal element, can the moment conducting and end, and pressure drop is zero during conducting, by the time leakage current be zero; Inductance, electric capacity are ideal elements; The ripple voltage in the output voltage and the ratio of output voltage are little to be ignored to allowing.In a switch periods, the sinusoidal voltage of input can be similar to thinks direct voltage, according to the operation principle of Buck-Boost, and the relation of input voltage and output voltage:
Wherein uo, ui are respectively an input voltage and an output voltage in the switch periods, and D is a duty ratio.From a complete power frequency period, the relation of input voltage effective value and output voltage effective value also meets:
Therefore, in input voltage Vi instability or load variations, only needing to change duty ratio D can regulated output voltage Vo.The selection of filter inductance L and filter capacitor C can obtain through designing and calculating with reference to prior art Buck-Boost circuit parameter.
A preferred embodiment of the control unit 40 of the interchange of the utility model is adjustable power measurement power source special is as shown in Figure 4, and control unit 10 adopts the microprocessor program control units.In the present embodiment; Adopt STC12C5412AD single-chip microcomputer IC1 as control chip, memory, IO interface circuit, AD converter, timer and 4 passages of chip internal the is integrated microprocessor of executive control program, storage data and control program are caught comparing unit (PCA module).3 end pressurizer U1 provide 5V single-chip microcomputer operating voltage, and ZD1, ZD2 and ZD3 are used to protect single-chip microcomputer for the 5.1V voltage-stabiliser tube.
Digital signal input end is connected to microprocessor through the IO interface circuit, and input end of analog signal is connected to microprocessor through AD converter, constitutes the digital signal input end and the input end of analog signal of control unit 10.
Single-chip microcomputer P1.2, P1.3 are operated in high-impedance state, as AD conversion input.Output voltage regulating element W1 is connected the input P1.3 of AD converter.Output voltage regulating element W1 is the potentiometer that is used to regulate output voltage, can produce the direct voltage of 0～5V, and the heuristicimal code that converts 00～1FF through AD to is as the pressure regulation benchmark.Adopt voltage sensor that output voltage is sampled in the output sampling unit, voltage sensor is the direct voltage of 0～5V with 0～250V AC voltage conversion.The output of voltage sensor is connected to the input DV of control unit; Again through after the RC filter circuit filtering High-frequency Interference; Be connected to the input P1.2 of AD converter; Sampled voltage is sent into microprocessor do mean value calculation, and do computing, obtain the value of duty ratio D with the output voltage that voltage-regulation element W1 sets.
Present embodiment utilizes the timer of single-chip microcomputer and PCA module to constitute 4 tunnel adjustable duty ratio PWM output units, and microprocessor is through 4 road PWM output of program control PWM output unit.
The PCA module of single-chip microcomputer contains 16 special bit timing counters, has 4 16 catch/comparison modules to be attached thereto.The count value of 16 PCA timer conters is exactly the content of register CH and CL.Each module is able to programme to be operated under 4 kinds of patterns: but rising/trailing edge is caught, software timer, at a high speed output or modulating pulse output.When the PCA timer conter overflows,, just can produce timer counter and interrupt if the CMOD register of microprocessor is set to allow interrupt status.The shared interrupt vector of all PCA modules.
The all corresponding special function register of each module of PCA. they are respectively: module 0 corresponding CCAPM0, module 1 corresponding CCAPM1, module 2 corresponding CCAPM2, module 3 corresponding CCAPM3.Special function register has comprised the mode of operation control bit of corresponding module.
The PCA timer conter is benchmark common time of 4 modules, can exist through programing work: 1/12 frequency of oscillation, 1/2 frequency of oscillation, timer 0 overflow or the input (P3.4) of ECI pin.The counting source of timer is confirmed by the CMOD register.PCA0 and PCA1 are set are operated under rising/trailing edge pattern, detect the crossover point signal of voltage, electric current.
All PCA modules can be done PWM output, enable the PWM pattern, the necessary set in the PWMn of module CCAPMn register and EC0Mn position, and its output frequency depends on the clock source of PCA timer.
Because the shared only PCA timer of all modules is so their output frequency is identical.The output duty cycle of each module is an independent variation, with use to catch register EPCnL relevant with CCAPnL.When the value of CL register during less than EPCnL and CCAPnL, be output as lowly, when the value of the CL of PCA register is equal to or greater than EPCnL and CCAPnL, be output as height.When the value of CL becomes 00 when overflowing by FF, the content of catching register EPCnH and CCAPnH is loaded among EPCnL and the CCAPnL, thereby realizes that interference-free upgrades PWM.Because PWM is 8, so:
When EPCnL=0 and CCAPnL=00H, PWM is fixing, and output is high;
When EPCnL=1 and CCAPnL=0FFH, PWM is fixing, and output is low.
The single-chip microcomputer external clock is the 11.0592M crystal oscillator, and the PCA timer is operated in 1/2 concussion frequency, and the frequency that has following formula can get PWM is: fPWM=21.6KHz is provided with PCA0 and PCA1 module and is operated in and can modulates the pulsewidth output mode:
PCA0 is connected to the output P3.7 of microprocessor IC1, and the PWM1 output through control unit 40 is connected to driver element, controls the first switching device S1; PCA1 is connected to the output P3.5 of microprocessor IC1, and the PWM2 output through control unit 40 is connected to driver element, control second switch device S2.
Trigger trap mode when PCA is operated in rising/trailing edge, module is sampled to the saltus step of outside input.When sampling effective saltus step, PCA hardware just is loaded into catching among register CCAPnL and the CCAPnH of module with the value of PCA timer conter register CH and CL.
PCA2 and PCA3 are set to rising/trailing edge and catch mode of operation, and the combined with hardware circuit design realizes voltage, current detecting in PCA interrupts.
Voltage, current over-zero testing circuit detect the output voltage zero crossing through comparator, convert analog quantity to digital quantity, send singlechip interruption INT0 and INT1, through the on off state of software program control switch device.
The output sampling unit comprises voltage zero-crossing detection circuit, and voltage zero-crossing detection circuit is as shown in Figure 5, in the present embodiment, adopts the LM311 voltage comparator to accomplish voltage zero-cross and detects.Output voltage obtains the AC signal ZC of 50HZ after through step-down transformer, and in the present embodiment, step-down transformer is 220:12V, and transformer output voltage ZC is through forming the positive input terminal that low pass filter is delivered to voltage comparator U3 by R17 and C12.-15V process R18, R20 dividing potential drop obtain the reference voltage of comparator, regulate the small phase deviation that is produced by the RC low pass filter.3 pin of U3 approximate 0, and R21, C30 are pull-up resistor for output RC low pass filter R22.Its waveform is as shown in Figure 6.
Wherein ZC is a step-down transformer secondary waveform, and INT is the waveform behind voltage comparator.Can be known that by figure by just to negative zero crossing the time, INT is just in time at trailing edge at output voltage, output voltage is when bearing to positive zero crossing, and INT is just in time at rising edge.The INT output is connected to the INT0 input (single-chip microcomputer P2.0 pin) of delivering to control unit, and single-chip microcomputer utilizes rising/trailing edge of PCA2 to catch the phase place of judging output voltage.
Current sampling unit comprises current sampling circuit and current over-zero testing circuit; As shown in Figure 7, in the present embodiment, the input sample unit uses the precision current instrument transformer as the current sample element; The elementary input that is connected on said switch convertor unit of current transformer; Input current I1 is elementary through current transformer, and the secondary of current transformer can produce one and corresponding output current I2, and output current I2 becomes voltage signal through sampling resistor RS; Obtain sampling voltage VI1 through operational amplifier U2 amplification, send into zero cross detection circuit ZIC input.Zero cross detection circuit ZIC is identical with the voltage zero-crossing detection circuit principle, and its waveform is as shown in Figure 8.Can know by figure, when electric current by negative during to positive zero crossing INT1 just in time at trailing edge, when electric current just when bearing zero crossing, INT1 is just in time at rising edge.The output INT1 of current over-zero testing circuit ZIC is connected to the INT1 input (single-chip microcomputer P2.4 pin) of control unit, and single-chip microcomputer utilizes rising/trailing edge of PCA3 to catch the phase place of judging electric current.
Be used for the switching device S3 of afterflow and the driving PWM of S4 and interrupt realizing that its timing waveform figure is as shown in Figure 9 by timer.The time that produces the cycle of PWM is controlled by timer T1, and the size of duty ratio is controlled by T0.Confirm the initial value M1 of T1 timer, timer to be operated in for 1 clock cycle 16 bit timing device mode of operation be next to have according to the clock of cycle that produces PWM and single-chip microcomputer:
M1＝2
16-f
osc*T
By T=1/fpwm=46.296us, fosc=11.0592, M1=FE00H, promptly the initial value of timer T1 is TH1=0FEH, TL1=00H.
Confirm the TH0 of timer T0 and the initial value of TL0 according to the size that will export the PWM duty ratio.If output PWM duty ratio is D, the initial value of timer T0 is that M0 then has:
M0＝2
16-f
osc*T*D
Timer T1 overflows and makes the I/O mouth of output PWM put 1 in the interruption, and starts timer T0.It is clear 0 that timer T0 overflows the I/O mouth that interrupts making output PWM, and timeing closing device T0.
The I/O mouth P1.0 of microprocessor IC1 is connected to driver element as the output of PWM3, controls the 3rd switching device S3; The I/O mouth P3.4 of microprocessor IC1 is connected to driver element as the output of PWM4, controls the 4th switching device S4.
Present embodiment adopts the integrated IGBT gate drivers of IR2110 to constitute drive circuit, and IR2110 is a kind of binary channels high pressure, high speed voltage-type device for power switching, has the high-pressure side suspension drive circuit of bootstrapping floating power supply.Electrical schematic diagram shown in Figure 10 has been showed the drive circuit of the 3rd switching device S3 in the driver element, and driver element comprises No. 4 drive circuits, and other No. 3 drive circuits are identical.In the present embodiment, utilize optic coupling element and high-pressure side suspension drive circuit to realize the two-stage isolation, high speed photo coupling U5 isolates MCU driving signal PWM3 and drive circuit U4, fully guarantees the reliability of microprocessor program control system.C50 is that bootstrap capacitor, D26 are bootstrap diode, and C101 is a filter capacitor.Be charged to enough voltage (VCC) at S3 blocking interval C50; As HIN, when LIN is high level; VB and the internal circuit between the HO output that the last voltage VC50 of C50 passes through U4 connect, and C50 is through VB and the HO end of U4, and the grid of R28 and S3 and source electrode form the loop and discharge.This moment, C50 just was equivalent between the grid and source electrode that a voltage source is added to IGBT1, thereby made the S3 conducting.As HIN, when LIN is low level, connect between VB and the HO output and turn-off, conducting between HO and the VS output, S3 turn-offs, and the LO output low level makes Q3 turn-off the Q4 conducting.VCC is through bootstrap diode at the same time, and C50 and Q4 form the loop, C50 is charged, and be rapidly the C50 makeup energy, so circulation is repeatedly.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the technical scheme that is used for explaining the utility model; And be not the qualification that is used as the utility model; Any connotation based on the utility model is to variation, modification that the above embodiment did, all will drop in the protection range of claim of the utility model.
Claims (6)
1. one kind exchanges adjustable power measurement power source special, comprises switch convertor unit, input sample unit, output sampling unit, control unit and driver element, and described switch convertor unit is connected between AC power and the AC load, it is characterized in that:
Described switch convertor unit adopts 4 switching device and 4 diodes with control utmost point, forms the class Buck-Boost circuit that comprises the mirror image brachium pontis; The switching device of said type of Buck-Boost circuit connects one group of filter inductance and filter capacitor;
The anode of 4 diodes and negative electrode be the negative electrode and the anode of 4 switching devices of reverse parallel connection to first to fourth respectively;
The anode of first switching device and second switch device constitutes the input of switch convertor unit, is connected respectively to the two ends of input ac power; The negative electrode of the 3rd switching device and the 4th switching device is connected respectively to the two ends of filter capacitor, constitutes the output of switch convertor unit, is connected respectively to the two ends of output AC load; The negative electrode of first switching device is connected to the anode of the 3rd switching device and an end of filter inductance element, and the negative electrode of second switch device is connected to the anode of the 4th switching device and the other end of filter inductance element;
Said switch convertor unit is connected to and described control unit through said input sample unit and output sampling unit; Said control unit is connected to the control utmost point of said 4 switching devices through described driver element.
2. the adjustable power measurement power source special of interchange according to claim 1; It is characterized in that said control unit is the microprocessor program control unit, comprise memory, IO interface circuit, AD converter and the PWM output unit of microprocessor, storage data and the control program of executive control program; The input of said control unit comprises digital signal input end and input end of analog signal; Said digital signal input end is connected to microprocessor through the IO interface circuit; Said input end of analog signal is connected to microprocessor through AD converter, wherein has at least an input end of analog signal to be connected with the output voltage regulating element; Said PWM output unit comprises 4 road PWM modules at least, and microprocessor connects described driver element through the PWM module.
3. the adjustable power measurement power source special of interchange according to claim 1 is characterized in that said output sampling unit comprises voltage sampling circuit and voltage zero-crossing detection circuit; The input of voltage sampling circuit is connected the output of said switch convertor unit, and the output of voltage sampling circuit is connected to the input end of analog signal of said control unit; The output of switch convertor unit is connected to the digital signal input end of said control unit through voltage zero-crossing detection circuit.
4. the adjustable power measurement power source special of interchange according to claim 1 is characterized in that said input sample unit comprises current sampling circuit and current over-zero testing circuit; Current sampling circuit is connected the input of said switch convertor unit, and the output of current sampling circuit is connected to the digital signal input end of said control unit through the current over-zero testing circuit.
5. according to claim 3 or the adjustable power measurement power source special of the described interchange of claim 4; The output that it is characterized in that said voltage zero-crossing detection circuit and current over-zero testing circuit is connected to the external signal of said microprocessor and catches input, and microprocessor utilization rising/trailing edge is caught the phase place of judging voltage and current.
6. according to the adjustable power measurement power source special of the described interchange of the arbitrary claim of claim 1 to 4; It is characterized in that said driver element comprises high-pressure side suspension drive circuit and optic coupling element, be connected to the control utmost point of said switching device after the output of said control unit is isolated through optic coupling element and high-pressure side suspension drive circuit two-stage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120353435U CN202150804U (en) | 2011-09-20 | 2011-09-20 | AC adjustable special-purpose power supply for electric power measuring |
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| CN201120353435U CN202150804U (en) | 2011-09-20 | 2011-09-20 | AC adjustable special-purpose power supply for electric power measuring |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102324855A (en) * | 2011-09-20 | 2012-01-18 | 辽宁省电力有限公司 | Special AC (alternate current) adjustable power supply for carrying out power measurement and control method thereof |
| WO2015062483A1 (en) * | 2013-10-28 | 2015-05-07 | Neal George Stewart | High frequency series ac voltage regulator |
| WO2015085926A1 (en) * | 2013-12-10 | 2015-06-18 | Neal George Stewart | Improved high frequency series ac voltage regulator |
| CN104779812A (en) * | 2014-01-10 | 2015-07-15 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
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2011
- 2011-09-20 CN CN201120353435U patent/CN202150804U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324855A (en) * | 2011-09-20 | 2012-01-18 | 辽宁省电力有限公司 | Special AC (alternate current) adjustable power supply for carrying out power measurement and control method thereof |
| WO2015062483A1 (en) * | 2013-10-28 | 2015-05-07 | Neal George Stewart | High frequency series ac voltage regulator |
| CN105723603A (en) * | 2013-10-28 | 2016-06-29 | 逸节电子有限公司 | High frequency series AC voltage regulator |
| CN105723603B (en) * | 2013-10-28 | 2020-02-11 | 逸节电子有限公司 | High-frequency series AC voltage regulator |
| WO2015085926A1 (en) * | 2013-12-10 | 2015-06-18 | Neal George Stewart | Improved high frequency series ac voltage regulator |
| CN104779812A (en) * | 2014-01-10 | 2015-07-15 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
| CN104779812B (en) * | 2014-01-10 | 2019-06-04 | 浙江海利普电子科技有限公司 | Frequency converter and power supply unit |
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