CN109390915A - Method of controlling security, equipment and its system of system with pre-charge circuit - Google Patents
Method of controlling security, equipment and its system of system with pre-charge circuit Download PDFInfo
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- CN109390915A CN109390915A CN201710664360.5A CN201710664360A CN109390915A CN 109390915 A CN109390915 A CN 109390915A CN 201710664360 A CN201710664360 A CN 201710664360A CN 109390915 A CN109390915 A CN 109390915A
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- circuit
- charge circuit
- voltage
- umax
- charge
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Classifications
-
- 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
- H02H7/1216—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 AC-AC converters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to technical field of automatic control, and in particular to a kind of method of controlling security, equipment and its system of the system with pre-charge circuit；The method of controlling security includes after system completes charging, obtain the voltage U at pre-charge circuit both ends, compare the voltage U at pre-charge circuit both ends and the voltage setting value Umax at pre-charge circuit both ends, voltage setting value Umax=Rmax × Imax, Rmax are the contactor of pre-charge circuit or the contact resistance value of relay, and Imax flows through the current value of pre-charge circuit when being rated load operation, as U < m*Umax, system is normal, as U >=m*Umax, issues overcurrent alarm signal；The equipment includes being controlled using the method for controlling security；The system comprises the equipment；More comprehensively, faster, the equipment and system structure are simple, at low cost for discovery failure for the control method protection.
Description
Technical field
The present invention relates to technical field of automatic control, and in particular to a kind of safety control of the system with pre-charge circuit
Method, equipment and its system processed.
Background technique
Big-power transducer pre-charge circuit is realized by contactor (or relay) pre-charge resistance in parallel.
When powering on beginning, contactor (or relay) is in an off state pre-charge circuit, and capacitor passes through precharge electricity
Charging energy-storing is hindered, contactor (or relay) is connected after charging complete, and rectification circuit output is by contactor (or relay)
Contact system is directly to inverter power supply.
If after charging complete, contactor or relay are not closed, and pre-charge resistance is still series on major loop, precharge
The voltage at resistance both ends increases, and causes to flow through high current for a long time inside pre-charge resistance, leads to its fever, or even surrounding of igniting
Combustible.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, provide it is a kind of protection more comprehensively, can find system in time
Failure and issue overcurrent alarm signal the system with pre-charge circuit method of controlling security, a kind of structure is simple, cost
The safety control device and its system of the low system with pre-charge circuit.
To achieve the above object, present invention employs following technical solutions:
A kind of method of controlling security of the system with pre-charge circuit comprising: after system completes charging, obtain preliminary filling
The voltage U at circuit both ends compares the voltage U at pre-charge circuit both ends and the voltage setting value Umax at pre-charge circuit both ends,
Voltage setting value Umax=Rmax × Imax, Rmax are the contactor of pre-charge circuit or the contact resistance value of relay, Imax
For the current value for flowing through pre-charge circuit when rated load operation, as U < m*Umax, system is normal, as U >=m*Umax,
Overcurrent alarm signal is issued, m is greater than 0.
Preferably, it as m*Umax≤U≤n*Umax, issues overcurrent alarm signal and is shut down within time t, t is to stop
Machine protects the waiting time；As U > n*Umax, overcurrent alarm signal and hard stop are issued；Wherein, m, n are any greater than 0
Number, and m < n.
Preferably, the arbitrary value between the m=0.9-1, arbitrary value between n=1.1-1.5.
Preferably, the stoppage protection waiting time t≤1min, time t and load current square at anti-time limit characteristic.
Preferably, the voltage U is the average value of the voltage measuring value of multiple pre-charge circuit both end voltages.
Preferably, the voltage U uses average algorithm, i.e., in time T, continuously measures n times, removal maximum voltage is surveyed
Magnitude and minimum voltage measured value, then averaged.
Preferably, the time T is 10ms, N=5.
A kind of safety control device of the system with pre-charge circuit, uses and described is with pre-charge circuit
The method of controlling security of system is controlled comprising for acquiring the voltage detecting circuit of the voltage at pre-charge circuit both ends, with
The connected signal processing circuit of voltage detecting circuit, and what is be connected with signal processing circuit are used to calculate pre-charge circuit both ends
Average voltage, comparison voltage U and voltage setting value Umax processor MCU.
Preferably, the safety control device be frequency converter, further include include power circuit, be connected with power circuit it is whole
Current circuit 1, the pre-charge circuit 2 and filter circuit 3 being connected between two output ends of rectification circuit 1, and and filtered electrical
The output end of the inverter circuit 4 in parallel of road 3, inverter circuit 4 is connected with load.
A kind of system with pre-charge circuit comprising the security control of the system with pre-charge circuit is set
It is standby.
The method of controlling security of system with pre-charge circuit of the invention, by comparing the electricity at pre-charge circuit both ends
The setting value Umax for pressing U and pre-charge circuit both end voltage, can be in the contactor or not closed relay of pre-charge circuit
Protection is provided for system, guarantor can also be provided when aging occur in the contactor of pre-charge circuit or the contact of relay for system
Shield can also cause to continue overcurrent extremely and provide protection for system when exceeding schedule time in system load, make system by
More comprehensive the case where protecting, avoiding the electrical resistance overheats of pre-charge circuit generation；And this method is simple, detection, operation effect
Rate is high, is conducive to the abnormal conditions for being found to have the system of pre-charge circuit in time.In addition, the control method is according to precharge
The difference of the multiple proportion of the setting value Umax of the voltage U and pre-charge circuit both end voltage at circuit both ends, makes different guarantors
Shield measure keeps the protection that there is the system of pre-charge circuit to be subject to more rationally and perfect.Of the invention has pre-charge circuit
System safety control device and its system cost it is low, protecting effect is more comprehensive, can detect the exception of system in time
Situation simultaneously makes corresponding safeguard measure.
Detailed description of the invention
Fig. 1 is the circuit diagram of big-power transducer of the present invention；
Fig. 2 is the step flow chart of the method for controlling security for the system that the present invention has pre-charge circuit；
Fig. 3 is the I2/t inverse-time curve square between stoppage protection waiting time t of load current of the invention.
Specific embodiment
The following contents further illustrates the specific reality of the method for controlling security of the system with pre-charge circuit of the invention
Apply mode.The method of controlling security of system with pre-charge circuit of the invention is not limited to the following description.
The method of controlling security of system with pre-charge circuit of the invention after system completes charging, obtains precharge
The voltage U at circuit both ends compares the voltage U at pre-charge circuit both ends and the voltage setting value Umax at pre-charge circuit both ends, electricity
Press setting value Umax=Rmax × Imax, wherein Rmax be pre-charge circuit contactor or relay contact resistance value,
Imax flows through the current value of pre-charge circuit when being rated load operation, as U < m*Umax, system is normal, as U >=m*Umax
When, issue overcurrent alarm signal.
After system charging complete, if contactor (or relay) is not closed or contactor (or relay) contact system
There is exception in system, its contact resistance is caused to increase, and contact voltage drop increases, and the voltage at pre-charge circuit both ends is caused to increase；If
When load overload causes system overcurrent, the voltage for also resulting in pre-charge circuit both ends is increased.Of the invention has precharge electricity
The method of controlling security of the system on road is set by comparing the voltage U at pre-charge circuit both ends and the voltage at pre-charge circuit both ends
Definite value Umax can provide protection when the contactor (or relay) of pre-charge circuit is not closed for system, can also be pre-
Protection is provided for system when aging occurs in the contact of the contactor (or relay) of charging circuit, it can also be in system load exception
Protection is provided for system when causing to continue overcurrent and exceed schedule time, makes system by more comprehensive protection, avoids preliminary filling
The case where pre-charge resistance of circuit overheats.
The method of controlling security of system with pre-charge circuit of the invention comprising following steps:
(1) the voltage setting value Umax, Umax at pre-charge circuit both ends are calculated according to the following formula:
Voltage setting value Umax=Rmax × Imax
Wherein, Rmax is the contactor or relay contacts resistance value of pre-charge circuit, when Imax is rated load operation
Flow through the current value of pre-charge circuit；
(2) system starts to power, and the contactor (or relay) of pre-charge circuit 2 disconnects at this time, starts to charge；
(3) after system completes charging, the voltage that pre-charge circuit both ends are measured within time T obtains N number of voltage measurement
Value, removes the minimum value and maximum value of N number of measured value, then averaged, obtains the voltage U at pre-charge circuit both ends.
(4) the voltage U and voltage setting value Umax for comparing pre-charge circuit both ends have following three kinds of situations:
(41) as U < m*Umax, frequency converter is working properly；
(42) when m*Umax < U≤n*Umax, issue overcurrent alarm signal, and after issuing overcurrent alarm signal, when
Between issue load stopping signal within t, t is the stoppage protection waiting time, and stoppage protection waiting time t and load current is flat
Side's value is at this time slight overcurrent condition, if persistently keeping this over-current state that may cause to damage to system at anti-time limit characteristic
It is bad；
(43) when U > n*Umax, overcurrent alarm signal is issued, and issues load stopping signal immediately, is at this time serious mistake
Situation is flowed, is caused the reason is that relay is not closed and/or other circuits such as serious load overload and/or accumulator are different
Often.
It should be pointed out that the method for judging whether system charging is completed is as follows: the voltage at detection capacitor both ends works as capacitor
After both end voltage reaches the 90%-95% of capacitance voltage rated value, then it is assumed that system charging complete.For example, system is 380V system
System, then capacitance voltage rated value is 380*1.35=513V.
It is pointed out that the m, n are the arbitrary number greater than 0, the value and rated current and load electricity of m < n, m, n
Stream is related, as shown in Figure 3.
Preferably, the time T is 10ms, N=5.It is noted that the value of T, N and rated power, the preliminary filling of system
The pre-charge resistance of circuit is related.
Preferably, the arbitrary value between the m=0.9-1, the arbitrary value between preferably 0.95, n=1.1-1.5.
Preferably, the stoppage protection waiting time t≤1min, and stoppage protection waiting time t and load current is flat
Side's value is at anti-time limit characteristic, that is, the square value of load current is bigger, and the stoppage protection waiting time value of t is smaller.
The safety control device of system with pre-charge circuit of the invention is with pre-charge circuit using described
The method of controlling security of system is controlled comprising for acquiring the voltage detecting circuit of the voltage at pre-charge circuit both ends, electricity
Pressure detection circuit is connected to the both ends of pre-charge circuit, the signal processing circuit being connected with voltage detecting circuit, and and signal
The processing for the average voltage, comparison voltage U and setting value Umax for calculating pre-charge circuit both ends that processing circuit is connected
Device MCU.
The safety control device of system with pre-charge circuit of the invention, preferably big-power transducer.
As shown in Figure 1, the big-power transducer includes voltage detecting circuit, signal processing circuit and processor MCU, go back
Including power circuit, the rectification circuit being connected with power circuit 1, the preliminary filling being connected between two output ends of rectification circuit 1
Circuit 2 and filter circuit 3, and the inverter circuit 4 in parallel with filter circuit 3, output end and the load phase of inverter circuit 4
Even, voltage detecting circuit is connected to the both ends of the pre-charge resistance of pre-charge circuit.
The power circuit is three-phase power circuit, and rectification circuit 1 is three phase full wave rectification bridge, the R of three-phase power circuit
Phase output terminal, S phase output terminal and T-phase output end are connected with three phase full wave rectification bridge respectively, and pre-charge circuit 2 includes precharge electricity
Hinder the R and relay J in parallel with pre-charge resistance R, filter circuit 3 include concatenation two capacitor C, pre-charge resistance R with
Two capacitor C are sequentially connected in series and are serially connected between two output ends of rectification circuit 1, and inverter circuit 4 includes diode T1, two poles
Pipe T2, diode T3, diode T4, diode T5 and diode T6, diode T1 and diode T2 series connection, diode T3 and two
Pole pipe T4 series connection, diode T5 and diode T6 series connection, series circuit, diode T3 and two poles of diode T1 and diode T2
The series circuit of the series circuit of pipe T4, diode T5 and diode T6 be successively connected in parallel on filter circuit 3 two output ends it
Between, the intermediate node of diode T1 and diode T2 are connected with the output end U of inverter circuit 4, diode T3 and diode T4's
Intermediate node is connected with the output end V of inverter circuit 4, and the intermediate node of diode T5 and diode T6 is defeated with inverter circuit 4
Outlet W is connected, and output end U, output end V and output end W are connected with load respectively.
It is described with voltage detecting circuit, signal processing circuit and processor MCU be big-power transducer existing knot
Structure, when big-power transducer is controlled using the method for controlling security of the system with pre-charge circuit, only needing will be pre-
Charging circuit both ends are connected with the voltage detecting circuit of frequency converter, and the voltage measuring value at the pre-charge circuit both ends measured is passed through
It is transferred to the Micro-processor MCV of frequency converter after signal processing circuit processing, is compared with voltage setting value Umax, microprocessor
MCU can issue corresponding signal according to comparison result, without changing the structure of frequency converter, set without the hardware for increasing new
It is standby, it is at low cost, and can and detect the unusual condition of frequency conversion.
As shown in Figure 1, the course of work of the big-power transducer is as follows:
The contact resistance of the relay J of the big-power transducer is Rmax, and when pre-charge circuit rated load operation flows
The current value of precharged circuit is Imax, voltage setting value Umax=Rmax × Imax；
(A) power circuit of the big-power transducer is rectification by R phase output terminal, S phase output terminal and T-phase output end
Circuit 1 is powered, and rectification circuit 1 is the power supply of inverter circuit 4 by pre-charge resistance R；
(B) simultaneously, the rectification circuit 1 is that capacitor C fills energy via pre-charge resistance R by its output end, at this time relay
Device J is in an off state；
(C) when detecting that capacitor C completes charging, big-power transducer controls relay J closure will be by pre-charge resistance R
Road, rectification circuit 1 are directly powered for inverter circuit 4；
(D) it at this point, the voltage detecting circuit measures the voltage at pre-charge circuit both ends, and transmits a signal at signal
Manage circuit, signal processing circuit will treated signal is transferred to Micro-processor MCV, Micro-processor MCV will treated signal
Whether being compared with voltage setting value Umax, and judge system normally according to comparison result, if abnormal, Micro-processor MCV
It controls big-power transducer and issues overcurrent alarm signal, and/or control load is shut down.
As shown in Fig. 2, the step process of the method for controlling security for the system with pre-charge circuit of the invention, with big
For power inverter.
Power circuit power supply, the relay J of pre-charge circuit 1 is in an off state at this time, is started to charge, in filter circuit
After 2 capacitor C completes energy storage, the voltage U at pre-charge circuit both ends, the voltage of comparison voltage U and pre-charge circuit both ends are detected
Setting value Umax terminates charging if U < 0.95*Umax；If 0.95*Umax≤U≤1.5Umax, show load light overload or
There is getting up early aging in relay contact, then issues overcurrent alarm signal, and starts inverse time lag timing, and the time shuts down after, and ties
Beam charging；If U > 1.5Umax shows that relay cannot be closed, and/or load heavy overload and/or accumulator etc. other
Circuit abnormality then issues overcurrent alarm signal and load stopping signal immediately, and terminates to charge.
As shown in figure 3, being I2/ t inverse-time curve shows load current overcurrent percentage and stoppage protection waiting time t
Relationship, general m value is 0.95, and load current is continued above its rated current but is less than wink dynamic mistake flow point (i.e. n value),
The stoppage protection waiting time is generally defined as 1min, for permanent square frequency converter, the general value of n is 1.5, that is, is overloaded
150%, for becoming torque frequency converter, the general value 1.1-1.2 of n, i.e. overload 110%-120%.
System with pre-charge circuit of the invention is set including the security control with precharge circuitry
It is standby.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. a kind of method of controlling security of the system with pre-charge circuit, characterized in that it comprises: system completes charging
Afterwards, the voltage U for obtaining pre-charge circuit both ends, compares the voltage U at pre-charge circuit both ends and the voltage at pre-charge circuit both ends
Setting value Umax, voltage setting value Umax=Rmax × Imax, Rmax are the contact of the contactor or relay of pre-charge circuit
Resistance value, Imax flow through the current value of pre-charge circuit when being rated load operation, as U < m*Umax, system is normal, works as U
When >=m*Umax, overcurrent alarm signal is issued, m is greater than 0.
2. the method for controlling security of the system according to claim 1 with pre-charge circuit, it is characterised in that: work as m*
It when Umax≤U≤n*Umax, issues overcurrent alarm signal and is shut down within time t, t is the stoppage protection waiting time；As U >
When n*Umax, overcurrent alarm signal and hard stop are issued；Wherein, m, n are arbitrary number greater than 0, and m < n.
3. the method for controlling security of the system according to claim 2 with pre-charge circuit, it is characterised in that: the m
Arbitrary value between=0.9-1, arbitrary value between n=1.1-1.5.
4. the method for controlling security of the system according to claim 2 with pre-charge circuit, it is characterised in that: described to stop
Machine protects waiting time t≤1min, time t and load current square at anti-time limit characteristic.
5. the method for controlling security of the system according to claim 1 with pre-charge circuit, it is characterised in that: the electricity
Pressing U is the average value of the voltage measuring value of multiple pre-charge circuit both end voltages.
6. the method for controlling security of the system according to claim 5 with pre-charge circuit, it is characterised in that: the electricity
It presses U to use average algorithm, i.e., in time T, continuously measures n times, remove maximum voltage measured value and minimum voltage measured value,
Then averaged.
7. the method for controlling security of the system according to claim 6 with pre-charge circuit, it is characterised in that: when described
Between T be 10ms, N=5.
8. a kind of safety control device of the system with pre-charge circuit, it is characterised in that: it uses claim 1-7 any
The method of controlling security of the system with pre-charge circuit is controlled comprising for acquiring pre-charge circuit both ends
Voltage voltage detecting circuit, the signal processing circuit being connected with voltage detecting circuit, and being connected with signal processing circuit
For calculating the processor MCU of the average voltage at pre-charge circuit both ends, comparison voltage U and voltage setting value Umax.
9. the safety control device of the system according to claim 8 with pre-charge circuit, it is characterised in that: the peace
Full control equipment is frequency converter, further include include power circuit, the rectification circuit being connected with power circuit (1), be connected on rectification
Pre-charge circuit (2) and filter circuit (3) between two output ends of circuit (1), and it is in parallel with filter circuit (3) inverse
The output end on power transformation road (4), inverter circuit (4) is connected with load.
10. a kind of system with pre-charge circuit, it is characterised in that: it, which includes that claim 8 and 9 is any described, has in advance
The safety control device of the system of charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664360.5A CN109390915A (en) | 2017-08-04 | 2017-08-04 | Method of controlling security, equipment and its system of system with pre-charge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664360.5A CN109390915A (en) | 2017-08-04 | 2017-08-04 | Method of controlling security, equipment and its system of system with pre-charge circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109390915A true CN109390915A (en) | 2019-02-26 |
Family
ID=65412662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710664360.5A Pending CN109390915A (en) | 2017-08-04 | 2017-08-04 | Method of controlling security, equipment and its system of system with pre-charge circuit |
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| CN (1) | CN109390915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865498A (en) * | 2021-01-29 | 2021-05-28 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935619Y (en) * | 2006-04-25 | 2007-08-15 | 深圳市中传电气技术有限公司 | Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter |
| CN203056556U (en) * | 2013-01-11 | 2013-07-10 | 泉州市桑川电气设备有限公司 | Frequency converter charging loop having abnormity detection function |
| CN204835502U (en) * | 2015-07-20 | 2015-12-02 | 台安科技(无锡)有限公司 | Converter main relay fail safe circuit |
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN106230057A (en) * | 2016-08-18 | 2016-12-14 | 西北工业大学 | The precharge of a kind of converter and error protection integrated apparatus |
-
2017
- 2017-08-04 CN CN201710664360.5A patent/CN109390915A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2935619Y (en) * | 2006-04-25 | 2007-08-15 | 深圳市中传电气技术有限公司 | Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter |
| CN203056556U (en) * | 2013-01-11 | 2013-07-10 | 泉州市桑川电气设备有限公司 | Frequency converter charging loop having abnormity detection function |
| CN204835502U (en) * | 2015-07-20 | 2015-12-02 | 台安科技(无锡)有限公司 | Converter main relay fail safe circuit |
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN106230057A (en) * | 2016-08-18 | 2016-12-14 | 西北工业大学 | The precharge of a kind of converter and error protection integrated apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865498A (en) * | 2021-01-29 | 2021-05-28 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
| CN112865498B (en) * | 2021-01-29 | 2022-05-17 | 成都芯源系统有限公司 | Multiphase switching converter, controller and control method thereof |
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