CN106058816A - Two-stage overload protection method and inverter with application of method - Google Patents
Two-stage overload protection method and inverter with application of method Download PDFInfo
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- CN106058816A CN106058816A CN201610624706.4A CN201610624706A CN106058816A CN 106058816 A CN106058816 A CN 106058816A CN 201610624706 A CN201610624706 A CN 201610624706A CN 106058816 A CN106058816 A CN 106058816A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a two-stage overload protection method which comprises the steps of (1) detecting the battery voltage of the DC/DC conversion circuit of the front stage of an inverter, feeding a voltage value to a CPU unit through a DC feedback unit, and comparing the voltage value and a first preset value, wherein the CPU unit allows the front stage of the inverter to close output if the voltage value is larger than the first preset value, (2) detecting the load voltage of the DC/AC inverter circuit of the back stage of the inverter, feeding a voltage value to the CPU unit through an AC feedback unit, and comparing the voltage value and a second preset value, wherein the CPU unit allows the inverter to close output if the voltage value is larger than the second preset value. The invention also discloses the inverter which comprises the DC/DC conversion circuit of the front stage, the DC/AC inverter circuit of the back stage, a battery unit, the CPU unit, the DC feedback unit and the AC feedback unit. The invention provides the inverter, when the front stage overload protection is failed, the compensation can be carried out through the back stage, finally the output is closed, and the purpose of overload protection is achieved.
Description
Technical field
The present invention relates to electron electric power technical field, particularly to two grades of overload protection methods of inverter.
Background technology
Inverter is that direct current energy (battery, accumulator jar) is transformed into alternating current (generally 220V, 50Hz are sinusoidal wave).It
It is made up of inverter bridge, control logic and filter circuit.Briefly, inverter is exactly a kind of by low pressure (12 or 24 volts or 48 volts)
Unidirectional current is changed into the electronic equipment of 220 volts of alternating currents.
At present, the most progressively there are some inverters in market, and corresponding technology also comparative maturity, especially in protection side
Face, such as, the patent documentation of Publication No. CN105514941A discloses a kind of electric automobile inverter protection device, bag
Include: circuit control device, drive circuit, buffer circuit, accessory power supply, emergency circuit and busbar voltage testing circuit；And, string
Oneth IGBT of connection and the 2nd IGBT, an IGBT emitter stage and the 2nd IGBT colelctor electrode are connected, and an IGBT colelctor electrode connects
Busbar voltage positive pole, the 2nd IGBT emitter stage connects busbar voltage negative pole；Gate pole control signal is by drive circuit and buffering electricity
Road exports to IGBT and a gate pole of IGBT, and the power supply of circuit control device is converted into control IGBT break-make by accessory power supply
Voltage and to drive circuitry, busbar voltage testing circuit judges that busbar voltage, and will whether higher than bus HVT high voltage threshold
Voltage comparison signal exports to circuit control device, and emergency circuit is powered by busbar voltage and exported gate signal control three-phase lower half
Bridge IGBT turns on, and makes inverter enter actively short-circuit mode, and drive circuit is resetted by the exportable reset signal of circuit control device；
Wherein, actively short-circuit mode includes: upper actively short-circuit mode, half-bridge IGBT conducting on three-phase, under three-phase, half-bridge IGBT turns off；Under
Actively short-circuit mode, on three-phase, half-bridge IGBT turns off, half-bridge IGBT conducting under three-phase；Drive circuit and accessory power supply have height
Pressure isolation features.
Wherein, this inverter has busbar voltage (step voltage before inverter) overvoltage failure protection function, will bus electricity
Pressing the secure threshold (bus HVT high voltage threshold) with definition to compare in real time, once busbar voltage exceedes secure threshold, i.e. to inverse
Becoming device controller and send high voltage fault signal NFUZMAX, circuit control device makes inverter enter ASC pattern；Busbar voltage is i.e.
The voltage of bus capacitor, is also cell voltage.
This protection device is equally applicable to the other kinds of inverter in addition to electric automobile inverter, but, if female
Line voltage detecting breaks down and lost efficacy, and makes controller cannot send high voltage fault signal NFUZMAX, can causing trouble protection lose
Effect.
Summary of the invention
The first object of the present invention is to provide two grades of overload protection methods, can when inverter prime overload protection lost efficacy
Made up by inverter rear class, make inverter close output, thus reach to protect purpose.
The above-mentioned purpose of the present invention technical scheme is that.
A kind of two grades of overload protection methods, including,
Step one: the cell voltage of the DC/DC translation circuit of detection inverter prime, by DC feedback unit by this electricity
Pressure value is fed back to CPU element, and by this magnitude of voltage and the first preset value comparison, if this magnitude of voltage is more than the first preset value, CPU is mono-
Unit makes inverter prime close output；
Step 2: the load voltage of the DC/AC inversion circuit of detection inverter rear class, by AC regeneration unit by this electricity
Pressure value is fed back to CPU element, and by this magnitude of voltage and the second preset value comparison, if this magnitude of voltage is more than the second preset value, CPU is mono-
Unit makes inverter close output.
Preferred: wherein, in step 2, if the magnitude of voltage of load voltage is more than the second preset value and the electricity of cell voltage
Pressure value is not more than the first preset value, and CPU element makes inverter rear class close output.
Preferred: wherein, in step 2, if the magnitude of voltage of load voltage is more than the second preset value and the electricity of cell voltage
Pressure value cannot determine, CPU element makes inverter rear class close output.
By using technique scheme, the first prime to inverter, i.e. the cell voltage of DC/DC translation circuit is examined
Surveying, if this magnitude of voltage is more than the first preset value, CPU element makes inverter prime close output, this technological means and traditional means
And zero difference.Prime to inverter again, i.e. the load voltage of DC/AC inversion circuit detects, if this magnitude of voltage is more than the
Two preset values, CPU element makes inverter close output；Here it is worth noting that the mode making inverter close output has two
Kind, first go the cell voltage judging the prime of inverter the most normal, if normally, make inverter rear class close by CPU element
Output；Maybe cannot determine whether normally if abnormal, make inverter prime close output by CPU element.
Preferred: wherein, in step 2, if the magnitude of voltage of load voltage is more than the second preset value and difference more than first
Preset difference value, CPU element makes inverter time-delay closing export；If the magnitude of voltage of load voltage surpasses more than the second preset value and difference
Crossing the second preset difference value, CPU element makes inverter close output immediately；
Wherein, the amplitude of the second preset difference value is more than the first preset difference value.
By using technique scheme, the first preset difference value can be arranged to the 10% of the second preset value, pre-by second
If difference is arranged to the 20% of the second preset value, so, if the magnitude of voltage of load voltage exceedes more than the second preset value and difference
Second preset value 10% time, CPU element makes inverter time-delay closing export；If the magnitude of voltage of load voltage is preset more than second
Value and difference more than the second preset value 20% time, CPU element makes inverter close output immediately；So, can be that inverter is pre-
Reserve the period of buffering, improve stability.
Preferred: wherein, in step one, if the magnitude of voltage of cell voltage is more than the first preset value, indicating member foundation
This magnitude of voltage makes duty instruction.
By using technique scheme, when cell voltage exists overpressure conditions, indicating member is used to make work shape
State indicates, in order to man-machine interaction.
The second object of the present invention is to provide inverter, and this inverter can pass through rear class when prime overload protection loses efficacy
Making up, final plant closure exports, thus reaches overload protection purpose.
The above-mentioned purpose of the present invention technical scheme is that.
A kind of inverter, including DC/DC translation circuit, DC/AC inversion circuit, battery unit and the CPU of rear class of prime
Unit, it is characterised in that also include that DC feedback unit, AC regeneration unit, described DC feedback unit are coupled to DC/DC and become
Change circuit to gather cell voltage, be further coupled to CPU element with the magnitude of voltage to CPU element feedback cell voltage；Described exchange
Feedback unit is coupled to DC/AC inversion circuit to gather load voltage, is further coupled to CPU element with to CPU element feedback load
The magnitude of voltage of voltage.
By using technique scheme, owing to being provided with DC feedback unit in the front end of transformator, and at transformator
Rear end is provided with AC regeneration unit, CPU element can first prime to inverter, i.e. the cell voltage of DC/DC translation circuit is carried out
Detection, if this magnitude of voltage is more than the first preset value, CPU element makes inverter prime close output.Prime to inverter again, i.e.
The load voltage of DC/AC inversion circuit detects, if this magnitude of voltage is more than the second preset value, CPU element makes inverter close
Output；Here it is worth noting that the mode making inverter close output has two kinds, first remove to judge the battery of the prime of inverter
Voltage is the most normal, if normally, makes inverter rear class close output by CPU element；Maybe just cannot determine whether if abnormal
Often, inverter prime is made to close output by CPU element.
Preferred: described DC feedback unit includes that sample resistance, one end of described sample resistance are used for gathering battery electricity
Pressure, the other end are for the magnitude of voltage to CPU element feedback cell voltage.
Preferred: described AC regeneration unit includes current-limiting resistance and is series at the RC circuit of current-limiting resistance, described RC electricity
Road is for the magnitude of voltage of CPU element feedback load voltage.
So, using current-limiting resistance that sampled signal can carry out current limliting, use RC circuit can improve response speed, raising is adopted
The precision of sample signal.
Preferred: also to include the indicating member being made up of switching device, display lamp, described switching device is coupled to transformator
Prime, according to the magnitude of voltage change on and off of cell voltage, controls display lamp and lights or extinguish.
So, by arranging switching device, display lamp and corresponding auxiliary circuit, when cell voltage exists overpressure conditions
Time can make duty instruction, in order to man-machine interaction.
Accompanying drawing explanation
Fig. 1 is inverter prime overload protection method flow chart；
Fig. 2 is inverter rear class overload protection method flow chart；
Fig. 3 is two grades of overload protection method flow charts of embodiment one；
Fig. 4 is two grades of overload protection method flow charts of embodiment two；
Fig. 5 is the functional block diagram of inverter；
Fig. 6 is the schematic diagram of DC feedback unit in inverter；
Fig. 7 is the schematic diagram of AC regeneration unit in inverter；
Fig. 8 is the schematic diagram of indicating member in inverter.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Seeing Fig. 1, a kind of inverter prime overload protection method, including the DC/DC translation circuit of detection inverter prime
Cell voltage step, judge the step of the magnitude of voltage size of cell voltage, when the magnitude of voltage of cell voltage is pre-more than first
If during value, i.e. judging that the magnitude of voltage of cell voltage is excessive, inverter prime is made to close output, when the magnitude of voltage of cell voltage is little
When the first preset value, i.e. judge that the magnitude of voltage of cell voltage is normal.
Seeing Fig. 2, a kind of inverter rear class overload protection method, including the DC/AC inversion circuit of detection inverter rear class
Load voltage step, judge the step of the magnitude of voltage size of load voltage, when the magnitude of voltage of load voltage is pre-more than second
If during value, i.e. judging that the magnitude of voltage of load voltage is excessive, inverter rear class is made to close output, when the magnitude of voltage of load voltage is little
When the second preset value, i.e. judge that the magnitude of voltage of load voltage is normal.
Seeing Fig. 3, a kind of two grades of overload protection methods, based on to inverter prime overload protection method and inverter rear class
The improvement of overload protection method, including two big steps, step one: the battery electricity of the DC/DC translation circuit of detection inverter prime
Pressure, is fed back this magnitude of voltage to CPU element by DC feedback unit, and by this magnitude of voltage and the first preset value comparison, if should
Magnitude of voltage is more than the first preset value, and CPU element makes inverter prime close output；Step 2: the DC/AC of detection inverter rear class
The load voltage of inversion circuit, is fed back this magnitude of voltage to CPU element by AC regeneration unit, and by this magnitude of voltage and second
Preset value comparison, if this magnitude of voltage is more than the second preset value, CPU element makes inverter close output.
In step 2, if the magnitude of voltage of load voltage is not more than the more than the magnitude of voltage of the second preset value and cell voltage
One preset value, CPU element makes inverter rear class close output.
In step 2, if the magnitude of voltage of load voltage cannot be true more than the magnitude of voltage of the second preset value and cell voltage
Fixed, CPU element makes inverter rear class close output.
So, the first prime to inverter, i.e. the cell voltage of DC/DC translation circuit detects, if this magnitude of voltage is big
In the first preset value, CPU element makes inverter prime close output, this technological means and traditional means zero difference.Again to inverse
Become the prime of device, i.e. the load voltage of DC/AC inversion circuit detects, if this magnitude of voltage is more than the second preset value, CPU element
Inverter is made to close output；Here it is worth noting that the mode making inverter close output has two kinds, first go to judge inverter
The cell voltage of prime whether normal, if normally, make inverter rear class close output by CPU element；If abnormal or nothing
Method determines whether normally, makes inverter prime close output by CPU element.
Seeing Fig. 4, a kind of two grades of overload protection methods, based on to inverter prime overload protection method and inverter rear class
The improvement of overload protection method, including two big steps, step one: the battery electricity of the DC/DC translation circuit of detection inverter prime
Pressure, is fed back this magnitude of voltage to CPU element by DC feedback unit, and by this magnitude of voltage and the first preset value comparison, if should
Magnitude of voltage is more than the first preset value, and CPU element makes inverter prime close output；Step 2: the DC/AC of detection inverter rear class
The load voltage of inversion circuit, is fed back this magnitude of voltage to CPU element by AC regeneration unit, and by this magnitude of voltage and second
Preset value comparison, if this magnitude of voltage is more than the second preset value, CPU element makes inverter close output.
It is with the difference proposing embodiment in Fig. 3, in step 2, if the magnitude of voltage of load voltage is more than the
Two preset values and difference are more than the first preset difference value, and CPU element makes inverter time-delay closing export；If the magnitude of voltage of load voltage
More than the second preset value and difference more than the second preset difference value, CPU element makes inverter close output immediately；Wherein, second is pre-
If the amplitude of difference is more than the first preset difference value.
With reference to Fig. 5, a kind of inverter, including the DC/DC translation circuit 100 of prime, the DC/AC inversion circuit 200 of rear class,
Battery unit 300, CPU element 400, DC feedback unit 500, AC regeneration unit 600, DC feedback unit 500 is coupled to
DC/DC translation circuit 100, to gather cell voltage, is further coupled to CPU element 400 to feed back cell voltage to CPU element 400
Magnitude of voltage；AC regeneration unit 600 is coupled to DC/AC inversion circuit 200 to gather load voltage, is further coupled to CPU element 400
With the magnitude of voltage to CPU element 400 feedback load voltage.Due to the preposition DC feedback unit 500 that is provided with at transformator, and
The rearmounted AC regeneration unit 600 that is provided with of transformator, CPU element 400 can first prime to inverter, i.e. DC/DC translation circuit
The cell voltage of 100 detects, if this magnitude of voltage is more than the first preset value, it is defeated that CPU element 400 makes inverter prime close
Go out.Prime to inverter again, i.e. the load voltage of DC/AC inversion circuit 200 detects, if this magnitude of voltage is pre-more than second
If value, CPU element 400 makes inverter close output；Here it is worth noting that the mode making inverter close output has two
Kind, first go the cell voltage judging the prime of inverter the most normal, if normally, make inverter rear class close by CPU element 400
Close output；Maybe cannot determine whether normally if abnormal, make inverter prime close output by CPU element 400.
With reference to Fig. 6, in one embodiment, DC feedback unit bag 500 includes sample resistance RX, one end of sample resistance RX
For gathering cell voltage, the other end for the magnitude of voltage to CPU element feedback cell voltage.
With reference to Fig. 7, in one embodiment, AC regeneration unit 600 includes current-limiting resistance and is series at current-limiting resistance
RC circuit, RC circuit is for the magnitude of voltage of CPU element feedback load voltage.So, employing current-limiting resistance can be to sampled signal
Carry out current limliting, use RC circuit can improve response speed, improve the precision of sampled signal.
With reference to Fig. 8, in one embodiment, indicating member includes switching device N01, display lamp LED-R, switching device coupling
It is connected to the DC/DC translation circuit 100 of prime, according to the magnitude of voltage change on and off of cell voltage, controls display lamp LED-R
Light or extinguish.So, by arranging switching device N01, display lamp LED-R and corresponding auxiliary circuit, cell voltage is worked as
Duty instruction can be made, in order to man-machine interaction when there is overpressure conditions.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
The present embodiment can be made after reading this specification by member as required does not has the amendment of creative contribution, but as long as at this
All protected by Patent Law in the right of invention.
Claims (9)
1. two grades of overload protection methods, including,
Step one: the cell voltage of the DC/DC translation circuit of detection inverter prime, by DC feedback unit by this magnitude of voltage
Feed back to CPU element, and by this magnitude of voltage and the first preset value comparison, if this magnitude of voltage is more than the first preset value, CPU element makes
Inverter prime closes output；
Step 2: the load voltage of the DC/AC inversion circuit of detection inverter rear class, by AC regeneration unit by this magnitude of voltage
Feed back to CPU element, and by this magnitude of voltage and the second preset value comparison, if this magnitude of voltage is more than the second preset value, CPU element makes
Inverter cuts out output.
2. according to two described in claim 1 grade overload protection method, wherein, in step 2, if the voltage of load voltage
Value is not more than the first preset value more than the magnitude of voltage of the second preset value and cell voltage, and it is defeated that CPU element makes inverter rear class close
Go out.
3. according to two described in claim 1 grade overload protection method, wherein, in step 2, if the voltage of load voltage
Value cannot determine more than the magnitude of voltage of the second preset value and cell voltage, and CPU element makes inverter rear class close output.
4. according to two described in claim 1 grade overload protection method, wherein, in step 2, if the voltage of load voltage
Value is more than the second preset value and difference more than the first preset difference value, and CPU element makes inverter time-delay closing export；If load voltage
Magnitude of voltage more than the second preset value and difference more than the second preset difference value, CPU element makes inverter close output immediately；
Wherein, the amplitude of the second preset difference value is more than the first preset difference value.
5. according to two described in claim 1 grade overload protection method, wherein, in step one, if the voltage of cell voltage
Value makes duty instruction more than the first preset value, indicating member according to this magnitude of voltage.
6. an inverter, DC/AC inversion circuit, battery unit and CPU including the DC/DC translation circuit of prime, rear class are mono-
Unit, it is characterised in that also include that DC feedback unit, AC regeneration unit, described DC feedback unit are coupled to DC/DC conversion
Circuit, to gather cell voltage, is further coupled to CPU element with the magnitude of voltage to CPU element feedback cell voltage；Described exchange is anti-
Feedback unit is coupled to DC/AC inversion circuit to gather load voltage, is further coupled to CPU element with electric to CPU element feedback load
The magnitude of voltage of pressure.
7. according to the inverter described in claim 1, it is characterised in that described DC feedback unit includes sample resistance, institute
State one end of sample resistance for gathering cell voltage, the other end for the magnitude of voltage to CPU element feedback cell voltage.
8. according to the inverter described in claim 1, it is characterised in that described AC regeneration unit includes current-limiting resistance and string
Being coupled to the RC circuit of current-limiting resistance, described RC circuit is for the magnitude of voltage of CPU element feedback load voltage.
9. according to the inverter described in claim 1, it is characterised in that also include the finger being made up of switching device, display lamp
Show that unit, described switching device are coupled to DC/DC translation circuit, according to the magnitude of voltage change on and off of cell voltage, control
Display lamp processed is lighted or extinguishes.
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| CN201610624706.4A CN106058816B (en) | 2016-07-29 | 2016-07-29 | A kind of two level overload protection method |
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| CN201610624706.4A CN106058816B (en) | 2016-07-29 | 2016-07-29 | A kind of two level overload protection method |
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| CN106058816B CN106058816B (en) | 2018-08-21 |
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| CN112428864A (en) * | 2020-12-21 | 2021-03-02 | 深圳威迈斯新能源股份有限公司 | Intelligent power grid quality identification and self-adaptive control method and vehicle-mounted OBC power transmission architecture |
| CN113113898A (en) * | 2021-04-29 | 2021-07-13 | 漳州科华技术有限责任公司 | UPS protection method and UPS |
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| CN106058816B (en) | 2018-08-21 |
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