CN102005904A

CN102005904A - Power circuit used for non-input rectification alternating current load or high-frequency power supply

Info

Publication number: CN102005904A
Application number: CN201010508666XA
Authority: CN
Inventors: 陈帮云
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-18
Filing date: 2010-10-18
Publication date: 2011-04-06

Abstract

The invention belongs to the technical field of electrical equipment, and relates to a power circuit used for a non-input rectification alternating current load or non-input rectification high-frequency power supply. The power circuit comprises a primary alternating current power unit formed by connecting two same basic power units, wherein input ends of the two basic power units of the primary alternating power unit are respectively used as input ends of a measured voltage, and the other ends of the two basic power units are used as common connecting ends connected together. The power circuit is used in a detection circuit, and elements of input rectifier tubes and the like can be avoided; the power circuit has the advantages of strong function, flexible setting, small volume, environment protection, wide test voltage range, no joint loss of the input rectifier tubes, no current below a threshold voltage, and the like when applied to a detection device and a power supply, and realizes the purposes of really directly inputting alternating current without using the power circuit for the non-input rectifier element alternating current electronic load or the non-input rectifier element high-frequency power supply.

Description

A kind of power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source

Technical field:

The invention belongs to the electric equipment technical field, relate to a kind of testing circuit of measuring instrument, be specifically related to a kind of power circuit that is used to not have the input rectifying alternating current electronic load or does not have the input rectifying high frequency electric source.

Background technology:

Present alternating current electronic load both domestic and external, of a great variety, must use the loop of power circuit of doing testing equipment on input rectifying pipe, power resistor, the bulky reactor basis when alternating current tested but also rest on.The critical defect of method in the past is exactly very dumb to the function that will be provided with, and being difficult in a basic structure gets on to realize multiple function, and suitable again huge of volume has very big restriction to the flexibility of using place and design.

Present in addition power supply also all needs the input rectifying element, causes the loss of rectification contact can't thoroughly get rid of all the time.This feedback-type has only the impedance loss of circuit during as the power circuit of power input, does not have the contact loss of rectifier cell fully, in the today of advocating environmental protection, low carbon technique, this structure from the green low-carbon technology nearer a step.

Also have special-purpose at present ALC control chip can't accomplish that also reach output amplitude when allowing the wide range input remains unchanged always, and the contained direct current composition of chip can not directly use in high-end equipment when output amplitude is very low also than higher.The purpose that the DC quantity that this special circuit has the electric current and voltage reference waveform to be provided with flexibly, to stablize, to export when pure interchange is imported can be adjusted flexibly.

Summary of the invention:

The objective of the invention is to overcome weak points such as the power circuit design is complicated in the prior art, electronic component is many, bulky, a kind of power circuit that is used to not have input rectifying element alternating current electronic load or does not have input rectifying element high frequency electric source is provided.

The present invention realizes that the technical scheme that its purpose adopts is: a kind of power circuit that is used to not have input rectifying element alternating current electronic load or does not have input rectifying element high frequency electric source, described power circuit comprises an one-level AC power unit that is connected to form by two identical prime power unit, described one-level exchanges the input of two prime power unit in the unit respectively as the input of tested voltage, and the other end of two prime power unit links together as public connecting end.

Also cooperate a analogue unit in the described one-level power cell, comprise a tested combined-voltage input, one in the described ALC automatic level control circuit and can edit dc reference input, dividing potential drop reference signal output, one the fixedly interchange of output amplitude or dc reference signal output, two buffer U1, U2, gear buffer cell more than, feedback communication effective values conversion direct current unit, error comparing unit U5, the positive and negative split circuit U3 of error, U4, input gain adjustment unit Q3, Q4 with special-purpose ALC automatic level control circuit.

Described power circuit comprises the secondary AC power unit that is connected to form by two or more described one-level AC power unit.

In the described secondary AC power unit, two inputs of each one-level AC power unit are linked in sequence from beginning to end, promptly form the heterogeneous secondary AC power of closo unit.

Perhaps, in the described secondary AC power unit, one of them input of each one-level AC power unit connects, and the other end is independent, promptly forms opening heterogeneous secondary AC power unit.

In the technique scheme, described prime power unit is the consumption-type power cell, it includes a tested ac phase voltage or direct-flow positive pole voltage input end, prime power circuit public connecting end, Current Control power stage and a corresponding with it benchmark and mode switch end, it also comprises the average mark pressure-controlled power stage that one or more are connected with described Current Control power stage, and each average mark pressure-controlled power stage is respectively equipped with corresponding isolation reference voltage sensing circuit unit.

Perhaps, described prime power unit is a PFC feedback type power cell, and it includes a tested ac phase voltage or direct-flow positive pole voltage input end, a prime power circuit public connecting end, an one-level switching tube, a PFC special chip, a negative half period power controlling pipe, a first class boost inductance.

Perhaps, described prime power unit is the anti-power supply feedback type power cell that swashs, and it includes a tested ac phase voltage or direct-flow positive pole voltage input end, a prime power circuit public connecting end, an one-level switching tube, a PWM special chip, a negative half period power controlling pipe, an one-level isolating transformer.

After the present invention adopts technique scheme, by being set, two identical prime power unit form one-level AC power unit, and realize single-phase, heterogeneous input ac voltage, organize the detection of DC input voitage more by the combination of several one-level AC power unit, avoid using the input rectifying element, be applied in can make in the checkout equipment checkout equipment have powerful, be provided with flexibly, volume is little, environmental protection, test voltage wide ranges, do not have the contact loss characteristics such as (bigger advantage being arranged at the low-voltage, high-current alternating-current measurement) of input rectifying pipe.

Advantage of the present invention is mainly reflected in:

1). meet the general requirement of 21 century environment-friendly products, the efficient height was a kind of real DC/AC electronic load that does not need the input rectifying element when loss contact lacked low pressure.

2). provide multiple, can carry out and the cooperating of software, the functional requirement of oneself has been set flexibly with this device at when exploitation terminal power loop apparatus very flexibly.

3). power circuit of the present invention can fundamentally reduce the volume of product, has not had to occupy the very reactor and the power resistor of large space.

4). can realize very flexibly that constant current mode, constant-resistance pattern, constant voltage mode, permanent power, rectification pattern, pulse mode, capacitive load pattern, inductive load pattern, short-circuit mode, direct current are anti-reverse, any loading mode of artificial editor or the like.

5). and alternating voltage loading frequency wide ranges (0～2.5KHz), can load any input AC waveform (such as sine wave, square wave, triangular wave, sawtooth waveforms etc.).

6). when realizing consumption-type, can improve input and bear voltage range by the mode that increases series connection power tube progression.

7). consumption-type can be tested the 0.1～500VRms or the test voltage of wide region more, directly improves the test specification of input voltage with increase power tube series system.

8). consumption-type can effectively prevent the oscillatory occurences of circuit before setting up test mode by the control of series connection two stage power circuit, power supply that like this can the various pattern work of adaptive testing.

9). realize the power circuit soft start by hardware very easily, when having reduced tested voltage and having inserted to the heavy current impact of loop of power circuit.

10). special-purpose automatic electric-level control alc circuit has guaranteed on the basis of burning voltage amplitude, voltage waveform is fully consistent with input voltage waveform, then can by single-chip microcomputer to this reference signal random carry out editing current waveform (reaching PF, CF value etc.) or on-load voltage waveform.

Description of drawings:

Fig. 1 is the theory diagram of one-level AC power of the present invention unit;

Fig. 2 is the theory diagram of a kind of secondary AC power of the present invention unit;

Fig. 3 is the theory diagram of the another kind of secondary AC power of the present invention unit;

Fig. 4 is the circuit theory diagrams of ALC automatic level control circuit of the present invention;

Fig. 5 is the circuit theory diagrams of a kind of consumption-type prime power of the present invention unit;

Fig. 6 is the circuit theory diagrams of a kind of PFC feedback type of the present invention prime power unit;

Fig. 7 is a kind of anti-circuit theory diagrams that swash feedback type prime power unit of the present invention.

Embodiment:

The present invention is further described below in conjunction with specific embodiments and the drawings.

At first, as shown in Figure 1, a kind of power circuit that is used to not have the input rectifying alternating current electronic load or does not have the input rectifying high frequency electric source, described power circuit comprises the one-level power cell 1 that is connected to form by two identical prime power unit 10, as the input of tested voltage, the other end of two prime power unit 10 links together as public connecting end the input of two prime power unit 10 in the described one-level power cell 1 respectively.Also comprise an ALC automatic level control circuit 11 in the described one-level power cell 1, in conjunction with shown in Figure 4, comprise a tested combined-voltage input 119 in the described ALC automatic level control circuit 11 again, can edit dc reference input 117 for one, a dividing potential drop reference signal output 112, the fixedly interchange or the dc reference signal output 118 of output amplitude, two buffer U1, U2, gear buffer cell 1110 more than one, feedback communication effective value conversion direct current unit 1111, error comparing unit U5, the positive and negative split circuit U3 of error, U4, input gain adjustment unit Q3, Q4.

The course of work of ALC automatic level control circuit 11 is as follows: the signal of tested voltage is sent into buffer U1 through electric resistance partial pressure, divide two-way output then, one the tunnel send U2 to go to realize balanced in real time series connection power dividing potential drop, and one the tunnel send the buffer cell 1110 of many gear controls.The signal of many gears buffer is sent into amplifying circuit Q1, Q2, be responsible for the signal of positive-negative half-cycle is sent into next stage Q5～Q8 by up and down gain controlled transistor Q1, Q2 respectively then, the signal that the AC signal of positive-negative half-cycle is merged complete cycle continues to divide two-way output.One the tunnel as exchanging or dc reference signal is sent into the fixedly interchange or the dc reference signal output 118 of output amplitude, and effective value commentaries on classics direct current high accuracy conversion circuit unit 1111 is sent on another road.To send into the voltage of next stage error comparing unit U5 and keyboard setting after effective value is converted to direct current makes comparisons, then difference is relatively sent into the negative feedback end of the positive and negative voltage of input gain adjustment unit Q3, Q4 by the positive and negative split circuit U3 of error, U4, voltage goes to adjust the gain of Q1, Q2 thus, reaches the stable purpose of output at last.

ALC automatic level control circuit 11 mainly is to be provided at the reference signal of 0～5KHz with interior amplitude stabilization to power circuit, in order to guarantee signal amplitude unanimity in 0～5KHz scope, so the bandwidth of alc circuit has been risen to 200KHz, and what adopt is the direct current coupling manner, has effectively avoided the influence of non-linear coupling element to the different frequency output amplitude.

Among the present invention, described prime power unit 10 can be for doing the consumption-type prime power unit of electronic load as shown in Figure 5, it includes a tested ac phase voltage or direct-flow positive pole voltage input end G1, a prime power circuit public connecting end H1, Current Control power stage Q11 and a corresponding with it benchmark and mode switch end A1, it also comprises the average mark pressure-controlled power stage Q12 that one or more are connected with described Current Control power stage Q11, Q13, and each average mark pressure-controlled power stage Q12, Q13 is respectively equipped with corresponding isolation reference voltage sensing circuit unit B 1, C1.

A unit is formed by one-level Current Control power Q11 or increase one-level to multistage series connection power tube (as: Q12, Q13) in above-mentioned prime power unit, can only serve as work with one-level Current Control power tube Q1 when exploitation low pressure and low power circuit; When the more high-tension power circuit of exploitation, can be composed in series the loop and serve as work by multistage average mark pressure-controlled power tube Q12, Q13 and Current Control level Q11.

All have the reference signal of isolation to import and mode switch element circuit (benchmark among Fig. 5 and mode switch, isolation reference voltage sensing circuit unit) at each grade average mark pressure-controlled power stage Q12, Q13, special-purpose dividing potential drop or constant voltage reference are responsible for that benchmark is delivered to each grade series connection power circuit and are carried out the dividing potential drop adjustment in proportion.Dividing potential drop, constant voltage reference signal and commutation circuit mainly under different mode to the switching and the editor of reference signal, and isolation voltage sensing unit circuit mainly is the reference voltage range signal that edits to be isolated simultaneously send each grade series connection power circuit unit to, average dividing potential drop by different patterns then, bear power and equate to reach each level.Just not can use dividing potential drop benchmark and isolation voltage sensing circuit when not needing to connect the power circuit unit, this moment directly the benchmark that edits is sent into first order Current Control power Q11 or Q11～Q13 circuit goes to realize various mode of operations.

The prime power circuit public connecting end H1 of two prime power unit shown in Figure 5 linked together promptly form as shown in Figure 1 one-level ac circuit power cell 1, it is a single phase alternating current (A.C.) loop or two groups of direct current power circuit, import two groups of direct-flow positive pole voltages by two G1 end input single phase alternating current (A.C.)s or G1 end with public connecting end respectively, can cooperate analogue unit again and carry out hardware setting such as single-chip microcomputer, instruction single-chip microcomputer, communication interface, keyboard, display module to constitute a complete detection module with special-purpose ALC automatic level control circuit 11.

Perhaps, with the one-level ac circuit power cell 1 shown in Fig. 1 is base unit, several one-level AC power unit 1 are connected, can form the heterogeneous secondary AC power of closo unit as shown in Figure 2, it is that two inputs by each one-level AC-AC power loop unit 1 are linked in sequence from beginning to end and form; Also can form opening heterogeneous secondary AC power unit as shown in Figure 3, it is that one of them input by each one-level ac circuit power cell 1 connects, the other end is independent and forms.

The advantage that adopts the formed testing circuit in prime power shown in Figure 5 unit be can wide range the test AC-input voltage, provide test very easily for scientific research institution, research and development department produce etc.

Among the present invention, described prime power unit 10 can be a kind of PFC feedback type prime power unit as shown in Figure 6, and it includes a tested ac phase voltage or direct-flow positive pole voltage input end G2, prime power circuit public connecting end H2, an one-level switching tube Q21, a PFC special chip, a negative half period power controlling pipe Q22, a first class boost inductance L 21.Its operation principle is: will exchange positive half cycle voltage or direct-flow positive pole voltage and export to the next stage direct current by the pfc circuit voltage stabilizing and deliver and flow back to the busbar voltage that the road provides work, the same structure PFC voltage stabilizing of negative half period output is simultaneously carried out output in parallel with this road.

In like manner the prime power circuit public connecting end H2 of two prime power unit shown in Figure 6 is linked together and promptly form as shown in Figure 1 one-level AC power unit 1, it is a single phase alternating current (A.C.) loop or two groups of direct current power circuit, import two groups of direct-flow positive pole voltages by two G2 end input single phase alternating current (A.C.)s or G2 end with public connecting end respectively, cooperate analogue unit again and carry out hardware setting such as single-chip microcomputer, instruction single-chip microcomputer, communication interface, keyboard, display module to constitute a complete detection module with ALC automatic level control circuit 11.

Perhaps, several one-level AC power unit 1 that adopt prime power unit 10 shown in Figure 6 to connect to form connect, can form the heterogeneous secondary ac circuit of closo power cell as shown in Figure 2, it is that two inputs by each one-level power cell 1 are linked in sequence from beginning to end and form; Also can form opening heterogeneous secondary ac circuit power cell as shown in Figure 3, it is that one of them input by each one-level ac circuit power cell 1 connects, the other end is independent and forms.

The advantage that adopts the designed testing circuit in feedback type prime power unit shown in Figure 6 is to realize the big efficient height of power, is suitable for long-term ageing test and to tests such as power supply unit impact properties.

Among the present invention, described prime power unit 10 can be that as shown in Figure 7 another kind of anti-swashs feedback type prime power unit, and it includes between a tested ac phase voltage or two groups and the public connecting end H3 imports direct-flow positive pole voltage input end G3, prime power circuit public connecting end H3, an one-level switching tube Q31, a PWM special chip, negative half period power controlling pipe Q32, an one-level isolating transformer T31.Its groundwork principle is: will exchange positive half cycle voltage or direct-flow positive pole voltage and be transferred to the next stage direct current after by one-level isolating transformer T31 rectifying and voltage-stabilizing and deliver and flow back to the busbar voltage that the road provides work, the voltage stabilizing output of the same structure of negative half period output is simultaneously carried out output in parallel with this road.

In like manner the prime power circuit public connecting end H3 of two prime power unit shown in Figure 7 is linked together and promptly form as shown in Figure 1 one-level ac circuit power cell 1, it is a single phase alternating current (A.C.) loop or two groups of direct current power circuit, respectively by input direct-flow positive pole voltage input end G3 between two G3 end input single phase alternating current (A.C.)s or two groups and the public connecting end H3, cooperate again to have ALC automatic level control circuit 11 and carry out single-chip microcomputer, instruct hardware setting such as single-chip microcomputer, communication interface, keyboard, display module to constitute a complete detection module.

Perhaps, several one-level power cells 1 that adopt prime power unit 10 shown in Figure 7 to connect to form connect, can form the heterogeneous secondary AC power of closo unit as shown in Figure 2, it is that two inputs by each one-level power cell 1 are linked in sequence from beginning to end and form; Also can form opening heterogeneous secondary AC power unit as shown in Figure 3, it is that one of them input by each one-level AC power unit 1 connects, the other end is independent and forms.

The advantage that adopts the designed testing circuit in feedback type prime power unit shown in Figure 7 is can accomplish more small size when measuring smaller power fixed voltage feedback type, realizes more high efficiency.

Claims

1. power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source, it is characterized in that: described power circuit comprises an one-level AC power unit (1) that is connected to form by two identical prime power unit (10), as the input of tested voltage, the other end (H) of two prime power unit (10) links together as public connecting end the input (G) of two the prime power unit (10) in the described one-level AC power unit (1) respectively.

2. a kind of power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source according to claim 1, it is characterized in that: described one-level AC power unit (1) also cooperates the analogue unit with an ALC automatic level control circuit (11), comprises a tested combined-voltage input (119) in the described ALC automatic level control circuit (11), an input difference amplifying unit (Q1, Q2), can edit dc reference input (117) for one, a dividing potential drop reference signal output (112), the fixedly interchange or the dc reference signal output (118) of output amplitude, two buffer (U1, U2), gear buffer cell more than one (1110), feedback communication effective value conversion direct current unit (1111), error comparing unit (U5), positive and negative split circuit (the U3 of error, U4), input gain adjustment unit (Q3, Q4).

3. a kind of power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source according to claim 2 is characterized in that: described power circuit comprises the secondary AC power unit (2) that is connected to form by two or more described one-level AC power unit (1).

4. a kind of power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source according to claim 3, it is characterized in that: in the described secondary ac circuit power cell (2), two inputs of each one-level AC power unit (1) are linked in sequence from beginning to end, promptly form the heterogeneous secondary AC power of closo unit.

5. a kind of power circuit that is used to not have input rectifying alternating current electronic load or high frequency electric source according to claim 3, it is characterized in that: in the described secondary AC power unit (2), one of them input of each one-level AC power unit (1) connects, the other end is independent, promptly forms opening heterogeneous secondary AC power unit.

6. according to claim 1 or 2 or 3 or 4 or 5 described a kind of power circuits that are used to not have input rectifying alternating current electronic load or high frequency electric source, it is characterized in that: described prime power unit (10) is the consumption-type power cell, it includes a tested ac phase voltage or direct-flow positive pole voltage input end (G1), a prime power circuit public connecting end (H1), a Current Control power stage (Q11) and a corresponding with it benchmark and mode switch end (A1), it also comprises the average mark pressure-controlled power stage (Q12 that one or more are connected with described Current Control power stage (Q11), and each average mark pressure-controlled power stage (Q12 Q13),, Q13) be respectively equipped with corresponding isolation reference voltage sensing circuit unit (B1, C1).

7. according to claim 1 or 2 or 3 or 4 or 5 described a kind of power circuits that are used to not have input rectifying alternating current electronic load or high frequency electric source, it is characterized in that: described prime power unit (10) is PFC control feedback type power cell, and it includes a tested ac phase voltage or direct-flow positive pole voltage input end (G2), a prime power circuit public connecting end (H2), an one-level switching tube (Q21), PFC special chip, a negative half period power controlling pipe (Q22), a first class boost inductance (L21).

8. according to claim 1 or 2 or 3 or 4 or 5 described a kind of power circuits that are used to not have input rectifying alternating current electronic load or high frequency electric source, it is characterized in that: described prime power unit (10) swashs power supply feedback type power cell for anti-, and it includes a tested ac phase voltage or direct-flow positive pole voltage input end (G3), a prime power circuit public connecting end (H3), an one-level switching tube (Q31), PWM special chip, a negative half period power controlling pipe (Q32), an one-level isolating transformer (T31).