CN104065254B - One kind output identification control unit and its inverter, system, control method - Google Patents
One kind output identification control unit and its inverter, system, control method Download PDFInfo
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Abstract
The present invention provides a kind of output identification control unit, and the output identification control unit includes sampling module, kernel control module；The sampling module, sample rate current is gathered from exchange conversion unit, and the sample rate current collected is sent to the kernel control module；The kernel control module, the sampled current value of the sampling module transmission is received compared with its default threshold value；When the sampled current value is less than threshold value, control signal control exchange conversion unit output direct current is sent；When the sampled current value is more than threshold value, control signal control exchange conversion unit output alternating current is sent.The present invention also provides the inverter with the output identification control unit, system, control method.The load characteristic provided by the invention for exporting identification control unit energy automatic identification inverter and being connect simultaneously controls inverter selection AC and DC output according to load characteristic, so as to reduce interference and power consumption.
Description
Technical field
The present invention relates to electronic circuit field, be specifically related to a kind of output identification control unit and its inverter, system,
Control method.
Background technology
In the design of current inverter, there are conventional several electric current way of outputs：Square wave exports, amendment ripple output,
Pure sine wave exports.These outputs, are all exchange output without exception, and its reason designs for compatible inductive load.
After voltage is become the alternating voltage transformation processing of interiors of products needs by the electric equipment products of early stage using Industrial Frequency Transformer, then
By the AC rectification after processing, filtering, voltage stabilizing, the electricity consumption part to product is exported.This kind of electrical equipment, it is necessary to using alternating current
Input, such as accompanying drawing 1.
But in present many equipment and household electrical appliance, in order to reduce volume, efficiency is improved, nearly all employs HF switch
Power supply, rather than be all the Switching Power Supply used using Industrial Frequency Transformer, such as the electrical equipment such as present television set, printer, computer
As complete machine power supply, this kind of electrical equipment, after input is by the direct rectifying and wave-filtering of power network alternating current, inputted with direct current,
As shown in Figure 2.
At present, the interference brought to reduce inverter is lost with reducing, and in design, effort reduces empty many inverters
Power consumption during load, i.e., it is allowed to enter sleep state during zero load, so as to reduce AC harmonic interference as far as possible.Such as 2009
The patent of invention of Patent No. 2009100278981.8, Patent No. disclosed in 27 days June in 2007 disclosed in October in year
ZL200620096352.2 patent of invention, the also similar patent disturbed for standby reduction, reduce power consumption, is all this kind of
Design.But in this kind of invention, can not solve AC influence in use completely, in it need not exchange the electrical equipment of input, still
So will by exchange input in a manner of output current, cause very big interference.In precision equipment, this interference is fatal sometimes
's.Such as color ultrasound in Medical Devices, endoscope, blood analyser etc., require that power supply is very pure, reduce interference as far as possible,
Avoid because the error that interference fringe comes causes the mistake of diagnosis.And this electric appliances, input power are virtually all opening in accompanying drawing 2
Powered-down source, it originally need not exchange input.
The content of the invention
To solve the above problems, the present invention provides the load characteristic that a kind of energy automatic identification inverter is connect and according to load
Property and control inverter selection AC and DC output conversion output identification control unit and its inverter, control method, so as to
Reduce interference and power consumption.
The present invention provides a kind of output identification control unit, the load characteristic connect for identifying inverter, and controls automatically
The corresponding required electric current of ac-dc conversion unit output of inverter processed, including：Sampling module, kernel control module；
The sampling module, sample rate current is gathered in exchange conversion unit, and the sample rate current collected is sent
To the kernel control module；
The kernel control module, receive the sampled current value and its default threshold value phase that the sampling module is sent
Compare；When the sampled current value is less than threshold value, control signal control exchange conversion unit output direct current is sent；Adopted when described
Sample current value is more than threshold value, sends control signal control exchange conversion unit output alternating current.
The present invention also provides a kind of inverter, and the inverter has output identification control unit as described above.
The present invention also provides a kind of system, and the system has the inverter of output identification control unit as described above.
The present invention also provides a kind of inverter control method, and methods described includes：
Obtain sample rate current；
Kernel control module compares the sample rate current with its default threshold value, when sample rate current is more than default threshold
Value, send control signal control exchange conversion unit output alternating current；When sample rate current is less than predetermined threshold value, control signal is sent
Control exchange conversion unit output direct current.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
1st, because the sampling module is from exchange conversion unit collection electric current, and the sample rate current collected is sent
To kernel control module, the kernel control module compares the sampled current value received with its default threshold value；Work as institute
State sampled current value and be less than threshold value, send control signal control exchange conversion unit output direct current；When the sampled current value
More than threshold value, control signal control exchange conversion unit output alternating current is sent.Therefore, the output identification control unit can be certainly
The dynamic load characteristic for identifying inverter and being connect simultaneously controls inverter selection AC and DC output conversion according to load characteristic, so as to
Reduce interference and power consumption.
2nd, because the output identification control unit also includes a drive module, therefore when the kernel control module exports
Control signal undertension to drive the exchange conversion unit when, the control signal of kernel control module output can
To be sent to the exchange conversion unit after drive module is changed.
3rd, because the control signal level of kernel control module highest output is 5V, exchange conversion unit can not be directly driven
P-type metal-oxide-semiconductor Q1, Q2, therefore increase N-type metal-oxide-semiconductor Q5, Q6, collectively constitute N-type multiple tube with Q1, Q2.
4th, because the output identification control unit also includes a Voltage stabilizing module, therefore can be by the Gao Wen of unstable voltage
The low ripple electric current that ripple electric current is converted into burning voltage is sent to the kernel control module.
5th, because the output identification control unit also includes a division module, therefore can become to being carried in the exchange
The voltage for changing unit carries out partial pressure, prevents that voltage is excessive is burned when exchange conversion unit from turning on.
6th, because R1, R2 one end are connected on Q1, Q2 source electrode respectively, the other end is connected on Q1, Q2 grid respectively；R6, R7's
One end connects with Q1, Q2 grid respectively, another source electrode for terminating at Q6, Q5, therefore can prevent from inciting somebody to action when Q6, Q7 are turned on
Q1, Q2 grid and source potential are divided to source voltage control within 12V, avoid burning out Q1, Q2.
7th, because the output identification control unit also includes the work for being used to represent the output identification control unit
The state indicator module of state, therefore can be evident from the working condition of the inverter output AC/DC.
8th, due to being controlled using single-chip microcomputer as kernel control module, therefore the change to function is very convenient, only
Need to slightly change just can accomplish that output overcurrent is protected, such as the length by the excessively stream time above R3, judge whether it is output
It is moderate.If translated into electric current after exchange still above upper threshold value, then output power-off protection can be performed.
9th, it is window phase among threshold value because FB pins set two threshold values, therefore can be critical existing effectively to avoid
Frequently output state changes back and forth as under.
Brief description of the drawings
Fig. 1 is the structured flowchart of output identification control unit provided in an embodiment of the present invention；
Fig. 2 is the structured flowchart for the output identification control unit that another embodiment of the present invention provides；
Fig. 3 is exchange conversion unit provided in an embodiment of the present invention and the circuit diagram for exporting identification control unit；
Fig. 4 is the schematic diagram of inverter provided in an embodiment of the present invention；
Fig. 5 is the flow chart of control method provided in an embodiment of the present invention；
Fig. 6 is the flow chart for the control method that another embodiment of the present invention provides；
Fig. 7 is Industrial Frequency Transformer load circuit figure mentioned in the present invention；
Fig. 8 is the circuit diagram of the load of Switching Power Supply mentioned in the present invention.
Embodiment
Invention provides the load characteristic that a kind of energy automatic identification inverter is connect and controls inverter according to load characteristic
The output identification control unit and its inverter, control method of AC and DC output are selected, so as to reduce interference.
Below in conjunction with the Figure of description in the present invention, the technical scheme in invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
Embodiment one,
As illustrated, the present invention provides a kind of inverter, the inverter includes：Battery unit, DC chopped-wave unit, every
From voltage transformation unit, rectification unit, exchange conversion unit, output identification control unit.Wherein battery unit, DC chopped-wave unit,
Isolation voltage transformation unit, rectification unit belong to prior art and unrelated to the invention, will not be repeated here.The output identification control
Unit controls the exchange conversion unit automatically according to loading condition output AC/DC electricity, i.e., when unloaded or load is switch electricity
During source interference and power consumption are reduced by exporting direct current.
As shown in figure 3, being the circuit diagram of one specific embodiment of exchange conversion unit, the exchange conversion unit includes：
The electric bridge being made up of 4 FETs (metal-oxide-semiconductor) Q1, Q2, Q3, Q4, from the direct current of rectification unit output, it is connected on the electric bridge
Input；FET Q1, Q2, Q3, Q4 control pole connect the output identification control unit respectively；The output end of electric bridge
Two electric wire is respectively designated as a and b；The control that each FET Q1, Q2, Q3, Q4 of electric bridge are sent in output identification control unit
Conducting and cut-off under signal processed, so as to the conversion output realized direct current, exchange two states.
As shown in figure 1, the output identification control unit includes：Sampling module 101, kernel control module 102.
The sampling module 101, sample rate current is gathered from exchange conversion unit, and the sample rate current collected is sent out
Give the kernel control module 102.
The kernel control module 102, it is default with it to receive the sampled current value that the sampling module 101 is sent
Threshold value compares；When the sampled current value is less than threshold value, control signal control exchange conversion unit output direct current is sent；When
The sampled current value is more than threshold value, sends control signal control exchange conversion unit output alternating current.
In summary, the sampling module gathers electric current, and the sample rate current that will be collected from the exchange conversion unit
Kernel control module is sent to, the kernel control module compares the sampled current value received with its default threshold value；
When the sampled current value is less than threshold value, control signal control exchange conversion unit output direct current is sent；When the sampling electricity
Flow valuve is more than threshold value, sends control signal control exchange conversion unit output alternating current.Therefore, the output identification control unit
The exchange conversion unit can be controlled to export AC DC electric automatically according to loading condition, so as to reduce the dry of inverter
Disturb and power consumption.
As shown in Fig. 2 in certain embodiments, the output identification control unit also includes a drive module, when described
When the undertension of the control signal of kernel control module output is to drive the exchange conversion unit, the kernel control module
The control signal of output is sent to the exchange conversion unit after drive module is changed.
As shown in figure 3, for a specific embodiment of drive module, the drive module includes:First, second metal-oxide-semiconductor
Q5、Q6.Because the control signal level of kernel control module highest output is 5V, the P of exchange conversion unit can not be directly driven
Type metal-oxide-semiconductor Q1, Q2, therefore increase N-type metal-oxide-semiconductor Q5, Q6, collectively constitute N-type multiple tube with Q1, Q2.
Described Q5, Q6 grid connect the control signal output pin respectively：K1_、K2_；Source ground；Drain electrode point
Described divider resistance R6, R7 a wherein connection end are not connected.
As shown in Fig. 2 in certain embodiments, the output identification control unit also includes a Voltage stabilizing module, described steady
The low ripple electric current that die block is used to the high ripple current of unstable voltage being converted into burning voltage is sent to the core control
Molding block.
As shown in figure 3, the Voltage stabilizing module U2 can be：Various linear voltage stabilization LDO or three terminal regulator, as HT7550,
ST7805, LM7805 etc., the preferred HT7550 of this specific embodiment integrated regulator U2, the integrated circuit U2 pins 1 are electricity
Input is flowed, and meets filter capacitor C1；Pin 2 is grounded；Pin 3 is current output terminal, and exports termination filter capacitor C2.
As shown in Fig. 2 in certain embodiments, the output identification control unit also includes a division module, described point
Die block is used to carry out partial pressure to the voltage for being carried in the exchange conversion unit, prevents voltage mistake when exchange conversion unit turns on
It is burned greatly.
As shown in figure 3, for a specific embodiment of division module, the division module includes：First, second pull-up electricity
Hinder R1, R2；First, second divider resistance R6, R7.
R1, R2 one end are connected on Q1, Q2 source electrode respectively, and the other end is connected on Q1, Q2 grid respectively；R6, R7 one end point
Do not connect with Q1, Q2 grid, another source electrode for terminating at Q6, Q5.Its effect is prevented Q1, Q2 when Q6, Q7 turn on
Grid is divided to source voltage control within 12V with source potential, avoids burning out Q1, Q2.
As shown in Fig. 2 in certain embodiments, the output identification control unit also includes one and is used to represent the output
The state indicator module of the working condition of identification control unit.
As shown in figure 3, the state indicator module is controlled by the control module.The state indicator module can include
Indicator lamp, indicating bell etc..The indicator lamp or indicating bell can be one or two, and as described in Figure 3, the indicator lamp is
Two, described two indicator lamp LED1, LED2 one end ground connection, one end connects the output identification control by resistance R4, R5 respectively
Unit processed, described two LED1, LED2 be respectively used to display control module control exchange conversion unit output alternating current and
The different conditions of direct current.
As shown in figure 3, the kernel control module can be single-chip microcomputer U1, such as：51 serial 14 single-chip microcomputers, for simplification
Circuit diagram, useless pin is unlisted, only draw power pins, GND pin, I/O ports (O/pin/K1_/K2_/K3/
K4), AD ports (FB pins).The described single-chip microcomputer belongs to prior art, will not be repeated here, each pin connection of single-chip microcomputer
Situation is as follows：
VCC pin：The VCC pin connects the output end of the voltage-stablizer U2, is transmitted for receiving the voltage-stablizer U2
The electric current with burning voltage, to start integral control circuit U1.
The pth in that C2 is directly moved to U1 in schematic diagram is to instruct PCB engineer, and this electric capacity must be connected on U1's
At nearest pin positions, it is impossible to connect capacitor arrangement with line a long way off.
I/O ports, specifically include as follows:
K1_, K2_, K1, K2 pin, wherein K1_, K2_ and K3, K4 are swung to；Four pins are used for described in output control
4 FETs Q1, Q2, Q3, Q4 of exchange conversion unit control signal.
2 O/ pins：Described LED1, LED2 are connected by described resistance R4, R5, control LED1, LED2 light on and off.
Due to being controlled using single-chip microcomputer as kernel control module, therefore the change to function is very convenient, only needs
Slightly changing just can accomplish that output overcurrent is protected, such as the length by the excessively stream time above R3, judge whether it is that output is suitable
In.If translated into electric current after exchange still above upper threshold value, then output power-off protection can be performed.
AD ports (FB pins)：The sampling resistor R3 is connected, receives the sampled signal of the sampling resistor R3 feedbacks.FB
Pin is provided with detection threshold value, and when sample rate current then controls K1_, K4 to export low level less than threshold value, K2_, K3 export high level,
At this moment Q2, Q3 are turned on, and Q1, Q4 cut-off, export direct current；When obtain sampling sample rate current be more than threshold value then control K1_, K4 and
K2_, K3 export alternating signal, so as to Q2, Q3 and Q1, Q4 alternate conductions, export alternating current.
Preferably, frequently output state variation back and forth under critical phenomena is avoided to be effective, upper and lower two can be set
Threshold value, middle two values are window phase.After output is changed into alternating current, the voltage of sampling module reduces at once, but because setting one
Individual lower threshold value, once upper threshold value reaches " B state ", electric current, which must drop to lower threshold value, can just be converted into A condition, and lower threshold value is very
It is low, purpose be intended merely to load disconnect after be automatically converted into direct current output state, even if so at this moment sampling module sampling
Voltage drops to normal value, still can keep exchanging electricity output.
Preferably, the FB pins are also connected with a filter capacitor C3.
As shown in figure 3, the sampling module is a sampling resistor R3, the connection ends of resistance R3 mono- connect the control respectively
The Voltage Feedback input FB pins of molding block and FET Q3, Q4 source electrode；The other end is grounded.
Present embodiment is exported as specific embodiment with the square wave of inverter, and actually the present invention is except that can apply
In the inverter of square wave output, the inverter that ripple or sinewave output etc. are corrected in control can also be directly applied to.
The course of work is as follows：
After upper electricity, single-chip microcomputer U1 enters initialization.After initialization terminates, K1_, K4 output low level, K2_, K3 output height
Level, at this moment Q2, Q3 conducting, Q1, Q4 cut-off, electric current flows to b through a, and maintains this state always, if this state is " A shapes
State ".
When access load for shown in accompanying drawing 8 Switching Power Supply load (such as：Printer), because circuit is operated in normal shape
Under state, then below the threshold range of FB pins, circuit state remains within " A condition " electric current；
Assuming that access load for as shown in Figure 7 Industrial Frequency Transformer load, because Industrial Frequency Transformer to direct current almost
No resistance, equivalent to 220V input direct short-circuits, electric current is very big, at this moment the voltage above R3 be increased immediately to upper threshold value with
On, after FB pins receive this signal, the output state that controlling switch K1_, K4 and K2_, K3 are converted into alternation is (specific real at this
Apply the preferred 50Hz of the control signal exported described in example), now, Q2, Q3 and Q1, Q4 alternate conductions, output become alternating current, if
This state is " B state ".
After output is changed into alternating current, the voltage on R3 reduces at once, but because setting a lower threshold value, once upper threshold value
Reach " B state ", electric current, which must drop to lower threshold value, can just be converted into A condition, and lower threshold value is very low, and purpose is intended merely to negative
Carry and be automatically converted into direct current output state after disconnecting, even if so at this moment voltage drops to normal value on R3, U1 output is still
It is constant, keep the output of alternating current.
Embodiment two,
The present invention also provides a kind of inverter for the output identification control unit having as described in embodiment one, the output
Identification control unit will not be repeated here referring to described in specific embodiment one.
Embodiment three,
The present invention also provides a kind of system of the inverter for the output identification control unit having as described in embodiment one, institute
Output identification control unit is stated referring to described in specific embodiment one, will not be repeated here.
The system can be to noise jamming and require higher system, such as Medical Devices.Existing Medical Devices
On need configure printer, because printer is office appliance, it is impossible to excessively medical safety, it is necessary to by inverter for it power supply,
Medical Devices are extremely sensitive to disturbing, after the present invention, because existing printer 98% is all powered (i.e. only for Switching Power Supply
Need powered by direct current), therefore the inverter of the present invention only needs to export directly in the case where it exports the control of identification control unit
Stream electricity, so as to solve interference problem.
Example IV,
The present invention also introduces a kind of control method of the output identification control unit of inverter as described in above-mentioned embodiment,
Partial content is described by previous embodiment in methods described, will not be repeated here.Methods described comprises the following steps：
S201, obtain sample rate current；
Sampling module obtains sample rate current and is sent to kernel control module.
S202, kernel control module compare the sample rate current with its default threshold value, when sample rate current is more than in advance
If threshold value, control signal control exchange conversion unit output alternating current is sent；When sample rate current is less than predetermined threshold value, control is sent
Signal control exchange conversion unit output direct current.
Preferably, the threshold value includes upper threshold value and lower threshold value, and centre is the empty window phase.
As Fig. 6 shows, method for a better understanding of the present invention, illustrated further below with more detailed embodiment.
S301, system complete initialization
S302, sampling module obtain the FB pins that sample rate current is sent to kernel control module.
S303, the sample rate current received according to the FB pins of kernel control module is compared with the preset value of the pin；When
Less than lower threshold value, S304 control K1_, K4 output low levels, K2_, K3 output high level are performed；When more than upper threshold value, execution
S305 controls K1_, K4 and K2_, K3 output alternating signals；When between upper threshold value and lower threshold value, S306 hold modes are performed
It is constant.
Further, the step S304 can also include controlling LED1 to light；The step S305 can also include control
LED2 is lighted.
S307, after constant time lag, repeat step S302-S306.
The constant time lag can be rational random time, be preferably 30mm in this specific embodiment.
Output identification control unit to a kind of inverter provided by the present invention and its inverter, system, control above
Method is described in detail, and for those of ordinary skill in the art, according to the thought of the embodiment of the present invention, is being embodied
There will be changes in mode and application, therefore, this specification content should not be construed as limiting the invention.
Claims (11)
1. one kind output identification control unit, the load characteristic connect for identifying inverter, and automatically control the friendship of inverter
Flow the corresponding required electric current of converter unit output, it is characterised in that including：Sampling module, kernel control module, drive module；
The sampling module, exported from the electric current of exchange conversion unit collection sampled output, and by the sampling collected
The electric current at end is sent to the kernel control module；
The kernel control module, receive the current value and its default threshold of the sampled output that the sampling module is sent
Value compares；When the current value of the sampled output is less than threshold value, it is straight to send control signal control exchange conversion unit output
Stream electricity；When the current value of the sampled output is more than threshold value, control signal control exchange conversion unit output alternating current is sent；
The drive module is used for when the control signal brownout of kernel control module output can not drive the exchange
During converter unit, by the control signal by the drive module to drive the exchange conversion unit.
2. output identification control unit according to claim 1, it is characterised in that the kernel control module is a monolithic
Machine, the pin of the single-chip microcomputer include：
VCC pin；
I/O ports, including first, second, third, fourth pin, wherein first, second swings to the three, the 4th pins；
AD ports, including feedback (FB) pin, described feedback (FB) pin set at least one threshold value.
3. output identification control unit according to claim 1 or 2, it is characterised in that the sampling module is a sampling
Resistance R3, the connection ends of sampling resistor R3 mono- connect feedback (FB) pin and the output identification of the kernel control module respectively
Control unit；The other end is grounded.
4. output identification control unit according to claim 1, it is characterised in that the drive module includes:Firstth,
Two FETs；
The grid of first, second FET connects first, second pin of the control signal output respectively；Source electrode
Ground connection；Drain output driving current.
5. output identification control unit according to claim 1 or 2, it is characterised in that the output identification control unit
Also include a Voltage stabilizing module, the low ripple electric current for the high ripple current of unstable voltage to be converted into burning voltage is sent to
The kernel control module.
6. output identification control unit according to claim 1 or 2, it is characterised in that described also including a division module
Division module is used to carry out partial pressure to the voltage for being carried in the exchange conversion unit of kernel control module output, prevents from exchanging
Voltage is excessive when converter unit turns on is burned.
7. output identification control unit according to claim 6, it is characterised in that the division module includes：Firstth,
Two divider resistances and its first, second pull-up resistor.
8. output identification control unit according to claim 1 or 2, it is characterised in that also including one by the core control
The state indicator module of the working condition for being used to represent output identification control unit of molding block control.
9. a kind of inverter, it is characterised in that there is the output identification control unit as described in claim any one of 1-8.
10. one kind output control system for identifying, the system include an inverter, it is characterised in that the inverter has such as
Output identification control unit described in claim any one of 1-8.
A kind of 11. control method of inverter, it is characterised in that including：
Obtain the electric current of sampled output；
Kernel control module compares the electric current of the sampled output with its default threshold value, when the sampled output
Electric current is more than predetermined threshold value, sends control signal control exchange conversion unit output alternating current；When the electric current of sampled output is small
In predetermined threshold value, control signal control exchange conversion unit output direct current is sent；
When the undertension for the control signal that the kernel control module exports is to drive the exchange conversion unit, the core
The control signal of heart control module output is sent to the exchange conversion unit after drive module is changed.
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| JP2001204177A (en) * | 2000-01-18 | 2001-07-27 | Miyachi Technos Corp | AC waveform inverter type power supply for joining metal members or with reflow soldering |
| AT410619B (en) * | 2000-07-14 | 2003-06-25 | Siemens Ag Oesterreich | METHOD FOR DETECTING AND / OR LIMITING THE SHORT CIRCUIT STATES OF A SWITCHING CONVERTER |
| CN2901330Y (en) * | 2006-04-20 | 2007-05-16 | 青岛艾诺电子仪器有限公司 | AC/DC withstand voltage insulation detector with high precision and high speed detecting and control circuit |
| CN202147087U (en) * | 2011-07-01 | 2012-02-22 | 无锡市南方电器制造有限公司 | Intermediate frequency inversion direct current and variable frequency alternating current resistance welding power supply |
| CN103001472A (en) * | 2011-09-14 | 2013-03-27 | 厦门蓝溪科技有限公司 | Miniature intelligent converter and method for controlling same |
| CN103066684A (en) * | 2013-01-06 | 2013-04-24 | 浙江中碳科技有限公司 | High voltage direct current power supply system |
| CN103414324A (en) * | 2013-07-29 | 2013-11-27 | 国家电网公司 | Low-voltage alternating-current and direct-current power source output device |
| CN103760939B (en) * | 2014-01-15 | 2015-12-09 | 小米科技有限责任公司 | Power source supply method, power-supplying circuit, power supply and terminal device |
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2014
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