CN106329506B - The adjustable servo controller overvoltage of rotection thresholds is released protection device and method - Google Patents
The adjustable servo controller overvoltage of rotection thresholds is released protection device and method Download PDFInfo
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- CN106329506B CN106329506B CN201610975780.0A CN201610975780A CN106329506B CN 106329506 B CN106329506 B CN 106329506B CN 201610975780 A CN201610975780 A CN 201610975780A CN 106329506 B CN106329506 B CN 106329506B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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- Nonlinear Science (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Released protection device, including microcontroller, DC bus-bar voltage collection circuit, rotection thresholds initialization circuit and comparison circuit the invention discloses a kind of adjustable servo controller overvoltage of rotection thresholds；The input of microcontroller is terminated with A/D change-over circuits; the input of DC bus-bar voltage collection circuit is connected with dc bus; the output end of DC bus-bar voltage collection circuit is all connected with the input of A/D change-over circuits and the input of comparison circuit; output end of the input of comparison circuit also with rotection thresholds initialization circuit is connected; input of the output end of rotection thresholds initialization circuit also with A/D change-over circuits is connected; the output of comparison circuit is terminated with overpressure vent circuit, and the output end of microcontroller is connected with inverter circuit；Released guard method the invention also discloses a kind of adjustable servo controller overvoltage of rotection thresholds.This invention ensures that real-time of releasing, adds the flexibility for rotection thresholds setting of releasing, improves the reliability of servo controller.
Description
Technical field
The invention belongs to servo controller over-voltage protection technology field, and in particular to a kind of adjustable servo control of rotection thresholds
Device overvoltage processed is released protection device and method.
Background technology
Servo controller is for controlling servomotor to realize high accuracy positioning or the equipment for following motion.At present, main flow
Servo controller all using microcontroller (single-chip microcomputer, DSP etc.) as control core realize complete control, monitoring and protect
Function.
Servo controller includes control circuit and power circuit.Power circuit generally comprises rectification circuit and electric with inversion
Road, rectification circuit and inverter circuit are attached by bus (i.e. dc bus), to prevent that occurring load during work generates electricity (such as
Situations such as brake, suitable load) make DC bus-bar voltage too high and cause circuit to damage, it can typically be bridged between bus by switch electricity
Road constitute leakage path, when detect busbar voltage it is too high after, control panel control leakage path conducting, to busbar voltage carry out
Electric discharge so that voltage returns to normality value, then control panel control leakage path disconnection.
Current overpressure vent protection is more to be released control using the release hardware of control or fixed threshold of softwares.
Software, which is released, to be controlled to carry out in real time DC bus-bar voltage sampling and A/D change-over circuits by micro-controller program
Detection, when detecting DC bus-bar voltage more than the rotection thresholds set, control leakage path carries out overpressure vent, reaches guarantor
The purpose of protecting system.But software control of releasing has following deficiency：(1) released protection relative to hardware, reliability is low.When on software
During failure, defencive function of releasing is lost；(2) software protection is final or real with respect to hardware protection by hardware action
When property is poor；
The hardware of fixed threshold releases control typically by sampling circuit samples DC bus-bar voltage, passes through comparator and base
Quasi- level compares, and produces the control signal of control leakage path switch to realize protection of releasing.The hardware of fixed threshold is released control
Make because the reference level that compares is fixed value, therefore the magnitude of voltage for boiling water of releasing is fixed, flexibility ratio is inadequate.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of rotection thresholds
Adjustable servo controller overvoltage is released protection device, and its is simple in construction, reasonable in design, and it is convenient to realize, is ensureing reality of releasing
On the basis of when property, the flexibility for rotection thresholds voltage setting of releasing is added, while adding overpressure vent shielding failure prison
Function is controlled, the reliability of servo controller is improved, practical, using effect is good, is easy to promote the use of.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of adjustable SERVO CONTROL of rotection thresholds
Device overvoltage is released protection device, it is characterised in that：The power supply electricity powered including microcontroller and for each power unit in device
Road, and DC bus-bar voltage collection circuit, rotection thresholds initialization circuit and comparison circuit；The power circuit and dc bus
Connection, the input of the microcontroller is terminated with A/D change-over circuits, the input of the DC bus-bar voltage collection circuit with it is straight
Flow bus connection, the output end of the DC bus-bar voltage collection circuit and the input of A/D change-over circuits and comparison circuit
Input is all connected with, and the output end of the input of the comparison circuit also with rotection thresholds initialization circuit is connected, the protection threshold
It is worth input of the output end of initialization circuit also with A/D change-over circuits to be connected, the output of the comparison circuit is terminated with overvoltage and let out
Electric discharge road, the overpressure vent circuit is connected with dc bus, and the output end of the microcontroller is connected with inverter circuit, described
Inverter circuit is connected with dc bus；The microcontroller, A/D change-over circuits, rotection thresholds initialization circuit and comparison circuit are equal
It is connected with the output end of power circuit.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The power supply
Circuit includes 15V voltage conversion circuits, 5V voltage conversion circuits, 3.3V voltage conversion circuits and 1.8V voltage conversion circuits, institute
15V voltage conversion circuits are stated including chip 7815, fast recovery diode D2 and fast recovery diode D3, the of the chip 7815
1 pin is connected by resistance R24 with fast recovery diode D2 negative electrode, and passes through nonpolar electric capacity C4 and polar capacitor in parallel
C5 is grounded；The anode of the fast recovery diode D2 is connected with dc bus, and the negative electrode of the fast recovery diode D2 passes through non-
Polar capacitor C3 is grounded；The anode of the fast recovery diode D3 is connected with the 3rd pin of chip 7815, two poles of the fast recovery
Pipe D3 negative electrode is connected with the 1st pin of chip 7815, the 2nd pin ground connection of the chip 7815；The 3rd of the chip 7815
Pin is the output end of the 15V voltage conversion circuits, and passes through nonpolar electric capacity C8, polar capacitor C6 and polarity electricity in parallel
Hold C7 ground connection；The 5V voltage conversion circuits include chip 7805 and fast recovery diode D4, the 1st pin of the chip 7805
It is connected by resistance R25 with the output end of the 15V voltage conversion circuits, and passes through nonpolar electric capacity C9 and polarity electricity in parallel
Hold C10 ground connection；The anode of the fast recovery diode D4 is connected with the 3rd pin of chip 7805, the fast recovery diode D4
Negative electrode be connected with the 1st pin of chip 7805, the 2nd pin of the chip 7805 ground connection；3rd pin of the chip 7805
For the output end of the 5V voltage conversion circuits, and pass through nonpolar electric capacity C14 in parallel and polar capacitor C13 ground connection；It is described
3.3V voltage conversion circuits include chip PS767D301, resistance R15, polar capacitor C11 and nonpolar electric capacity C12, the chip
PS767D301 the 1st pin, the 5th pin, the 6th pin, the 11st pin and the 12nd pin with the 5V voltage conversion circuits
Output end is connected, the 2nd pin of the chip PS767D301, the 3rd pin, the 7th~10 pin, the 13rd~16 pin, the 19th~
21 pins, the 26th pin and the 27th pin are grounded, and one end of the resistance R15 is drawn with the 22nd of the chip PS767D301
Pin and the connection of the 28th pin, the negative pole of the polar capacitor C11 and nonpolar electric capacity C12 one end are grounded, the resistance R15
The other end, polar capacitor C11 positive pole and nonpolar electric capacity the C12 other end connects and is the 3.3V voltage conversion circuits
Output end；The 1.8V voltage conversion circuits include chip PS767D301, resistance R16, resistance R23 and polar capacitor C15,
The positive pole of the polar capacitor C15 is connected with the 23rd pin and the 24th pin of the chip PS767D301, the resistance R23
One end and resistance R16 25th pin of the one end with the chip PS767D301 be connected, the polar capacitor C15's is negative
Pole and resistance the R23 other end are grounded, the positive pole of the polar capacitor C15 and resistance R16 other end connection and be described
The output end of 1.8V voltage conversion circuits.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The micro-control
Device processed is DSP TMS320F2808, and the A/D change-over circuits are integrated in the DSP
Inside TMS320F2808.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The protection
Threshold set circuit includes multi-turn precision potentiator VR1, precision fixed resister R13 and nonpolar electric capacity C1, the multi-turn essence
A close potentiometer VR1 fixing end and the output end of power circuit are connected, and another of the multi-turn precision potentiator VR1 is consolidated
Fixed end is connected with accurate fixed resister R13 one end, sliding end and the nonpolar electric capacity C1 of the multi-turn precision potentiator VR1
One end connection and for rotection thresholds initialization circuit output end VBreakSet, the other end of the accurate fixed resister R13
It is grounded with the nonpolar electric capacity C1 other end；Output end VBreakSet and A/D the conversion electricity of the rotection thresholds initialization circuit
The input on road and the input of comparison circuit are all connected with.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The direct current
Busbar voltage Acquisition Circuit includes resistor voltage divider circuit, nursed one's health for the fluctuation upper voltage limit to DC bus-bar voltage the
The secondary signal modulate circuit that one signal conditioning circuit and fluctuation lower voltage limit to DC bus-bar voltage are nursed one's health, described
One signal conditioning circuit and secondary signal modulate circuit are connected with the output end of resistor voltage divider circuit.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The resistance
Bleeder circuit includes resistance R2, resistance R3 and the resistance R4 of series connection, and resistance R2 one end is connected with dc bus, and the one of resistance R4
End ground connection, resistance R3 and resistance R4 connection end are the output end of the resistor voltage divider circuit；First signal conditioning circuit
Including first operation amplifier in first operational amplifier U1A in chip TL082 and resistance R12, the chip TL082
Device U1A in-phase input end is connected by resistance R8 with the output end of the resistor voltage divider circuit, and is grounded by resistance R7, institute
The inverting input for stating first in chip TL082 operational amplifier U1A is grounded by resistance R9, in the chip TL082
First operational amplifier U1A inverting input and output end between be connected in resistance R10, the chip TL082
One operational amplifier U1A output end is connected with resistance R12 one end, and the other end of the resistance R12 is the described first letter
The output end of number modulate circuit；The secondary signal modulate circuit include chip TL082 in second operational amplifier U1B and
The in-phase input end of second operational amplifier U1B in resistance R11, the chip TL082 passes through resistance R5 and the resistance
The output end connection of bleeder circuit, and be grounded by resistance R6, second operational amplifier U1B's in the chip TL082
Inverting input is grounded by resistance R17, the inverting input of second operational amplifier U1B in the chip TL082 with
The output end for second operational amplifier U1B being connected between output end in resistance R18, the chip TL082 is with resistance R11's
One end is connected, and the other end of the resistance R11 is the output end of the secondary signal modulate circuit；The first signal condition electricity
The output end on road and the output end of the secondary signal modulate circuit and the input of the input and comparison circuit of A/D change-over circuits
End is all connected with.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The comparison
Circuit includes first comparator in comparator chip LM293, resistance R14 and triode Q1, the comparator chip LM293
Output end of U2A in-phase input end and second comparator U2B in-phase input end with rotection thresholds initialization circuit
The inverting input of first comparator U2A in VBreakSet connections, the comparator chip LM293 and the described first letter
The inverting input of second comparator U2B in the output end connection of number modulate circuit, the comparator chip LM293 and institute
State the output end connection of secondary signal modulate circuit, one end of the resistance R14 and first in the comparator chip LM293
Individual comparator U2A in-phase input end and second comparator U2B in-phase input end are all connected with, and the resistance R14's is another
End is equal with the output end of first comparator U2A in the comparator chip LM293 and second comparator U2B output end
Connection, the base stage of the triode Q1 and the output end and second of first comparator U2A in the comparator chip LM293
Individual comparator U2B output end is all connected with, and is connected by the output end of resistance R1 and power circuit, the hair of the triode Q1
Emitter grounding, the output end of the current collection extremely comparison circuit of the triode Q1, and pass through the output of resistance 19 and power circuit
End connection.
The adjustable servo controller overvoltage of above-mentioned rotection thresholds is released protection device, it is characterised in that：The overvoltage
Grid of the leadage circuit including release switching tube Q2, sustained diode 1 and voltage-regulator diode D5, the switching tube Q2 that releases leads to
The negative electrode that resistance R21 is crossed with voltage-regulator diode D5 is connected, and is grounded by resistance R20, the resistance R21 and voltage-regulator diode D5
The connection end of negative electrode and the output end of comparison circuit connect, the source electrode of the switching tube Q2 that releases and voltage-regulator diode D5 sun
Extremely it is grounded, the drain electrode of the switching tube Q2 that releases is connected by resistance R23 with dc bus, and the resistance R22 for passing through series connection
With nonpolar electric capacity C2 ground connection, the anode of the sustained diode 1 is connected with the drain electrode for the switching tube Q2 that releases, the afterflow two
Pole pipe D1 negative electrode is connected with dc bus.
Present invention also offers a kind of method and step it is simple, realize that the adjustable servo controller of convenient rotection thresholds is excessively electric
Press guard method of releasing, it is characterised in that this method comprises the following steps：
Step 1: the DC bus-bar voltage that dc bus is exported to it is converted to the microcontroller, A/D by power circuit
Supply voltage needed for change-over circuit, rotection thresholds initialization circuit and comparison circuit, and be microcontroller, A/D change-over circuits, guarantor
Shield threshold set circuit and comparison circuit are powered；
Step 2: operation protection threshold set circuit sets rotection thresholds voltage VBreakSet, rotection thresholds initialization circuit
The voltage that power circuit is exported to it is exported to comparison circuit after being adjusted to rotection thresholds voltage VBreakSet, meanwhile, it will protect
Shield threshold voltage VBreakSet is exported to be exported to microcontroller to after the progress A/D conversions of A/D change-over circuits；
Step 3: the dc bus electricity that the resistor voltage divider circuit in DC bus-bar voltage collection circuit is exported to dc bus
Pressure detected in real time, by the DC bus-bar voltage detected export in real time to A/D change-over circuits progress A/D conversions after export to
Microcontroller；Meanwhile, the resistor voltage divider circuit in DC bus-bar voltage collection circuit by the DC bus-bar voltage detected simultaneously
Export to the first signal conditioning circuit and secondary signal modulate circuit in DC bus-bar voltage collection circuit, first signal
Modulate circuit exports the real-time sampling value of DC bus-bar voltage after nursing one's health the fluctuation upper voltage limit of DC bus-bar voltage
VBus_Up is to comparison circuit and microcontroller, fluctuation lower voltage limit of the secondary signal modulate circuit to DC bus-bar voltage
The real-time sampling value VBus_Down of DC bus-bar voltage is exported after being nursed one's health to comparison circuit and microcontroller；
Step 4: real-time sampling value VBus_Up and VBus_Down and rotection thresholds of the comparison circuit to DC bus-bar voltage
Voltage VBreakSet is compared, when the real-time sampling value VBus_Up of DC bus-bar voltage is more than rotection thresholds voltage
During VBreakSet, the comparison circuit generation 5V control signal BREAK that releases, which is exported, gives overpressure vent circuit, when dc bus electricity
When the real-time sampling value VBus_Down of pressure is less than rotection thresholds voltage VBreakSet, the output signal that comparison circuit produces 0V is defeated
Go out and give overpressure vent circuit；
Step 5: when the control signal BREAK that releases that comparison circuit produces 5V is exported to overpressure vent circuit, overvoltage is let out
Circuit realiration overpressure vent defencive function is put, when the output signal that comparison circuit produces 0V is exported to overpressure vent circuit, mistake
Pressure leadage circuit does not work；
Step 6: real-time sampling value VBus_Up and VBus_Down and rotection thresholds of the microcontroller to DC bus-bar voltage
Voltage VBreakSet is compared, when in calculating cycle T, when there is any one operating mode in following two operating modes, is assert
Failure is occurred in that for overpressure vent circuit, microprocessor control inverter circuit is stopped；
Operating mode one, rotection thresholds voltage VBreakSet are than real-time sampling value VBus_ of the microcontroller to DC bus-bar voltage
Up is low, and the DC bus-bar voltage that receives of microcontroller is constant or lasting rises；
Operating mode two, rotection thresholds voltage VBreakSet are than real-time sampling value VBus_ of the microcontroller to DC bus-bar voltage
Down is high, and the DC bus-bar voltage continuous decrease that microcontroller is received.
Above-mentioned method, it is characterised in that：Calculating cycle T described in step 6 is 1ms.
The present invention has advantages below compared with prior art：
1st, servo controller overvoltage of the present invention release protection circuit circuit structure it is simple, reasonable in design, it is convenient to realize.
2nd, the present invention utilizes the accurate current potential of multi-turn in rotection thresholds initialization circuit by setting rotection thresholds initialization circuit
Device, can release rotection thresholds voltage according to the setting of servo controller application scenario, realize control of releasing using hardware circuit, take into account
Flexibility and real-time, it is simple to operate.
3rd, the present invention is controlled by setting microcontroller and A/D change-over circuits, and to inverter circuit, is increased to releasing
The monitoring of validity is protected, in the case of shielding failure of releasing, input and output circuit is disconnected, it is ensured that system and safety.
4th, the present invention is slightly changed to existing servo controller can be achieved, and exploitativeness is strong, and increase cost is low.
5th, busbar voltage can near rotection thresholds voltage up and down fluctuate, the present invention by set by resistor voltage divider circuit,
The first signal conditioning circuit for being nursed one's health for the fluctuation upper voltage limit to DC bus-bar voltage and to DC bus-bar voltage
The DC bus-bar voltage collection circuit that the secondary signal modulate circuit that fluctuation lower voltage limit is nursed one's health is constituted, then stagnant ring ratio is set
Compared with circuit, the problem of switching tube of being released caused by being fluctuated above and below busbar voltage is frequently switched on can be eliminated, can extend and release out
The service life of pipe is closed, so as to extend the service life of overpressure vent circuit.
6th, servo controller overvoltage of the present invention release guard method method and step it is simple, it is convenient to realize.
7th, the present invention's is practical, and using effect is good, is easy to promote the use of.
In summary, reasonable in design, realization convenience of the invention, DC bus-bar voltage bleeder pipe is realized using hardware circuit
Reason, on the basis of real-time is released in guarantee, adds the flexibility for rotection thresholds voltage setting of releasing, while adding overvoltage
Release shielding failure monitoring function, improve the reliability of servo controller, practical, using effect is good, is easy to popularization to make
With.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is that the adjustable servo controller overvoltage of rotection thresholds of the present invention is released the schematic block circuit diagram of protection device.
Fig. 2 is the circuit theory diagrams of power circuit of the present invention.
Fig. 3 is the circuit theory diagrams of microcontroller of the present invention and A/D change-over circuits.
Fig. 4 is the circuit theory diagrams of DC bus-bar voltage collection circuit of the present invention.
Fig. 5 is the circuit theory diagrams of rotection thresholds initialization circuit of the present invention.
Fig. 6 is the circuit theory diagrams of comparison circuit of the present invention.
Fig. 7 is the circuit theory diagrams of overpressure vent circuit of the present invention.
Description of reference numerals:
1-power circuit；2-microcontroller；3-A/D change-over circuits；
4-DC bus-bar voltage collection circuit；5-rotection thresholds initialization circuit；6-comparison circuit；
7-overpressure vent circuit；8-inverter circuit；9-dc bus.
Embodiment
Protection device, including micro-control as shown in figure 1, the adjustable servo controller overvoltage of rotection thresholds of the present invention is released
Device 2 processed and the power circuit 1 powered for each power unit in device, and DC bus-bar voltage collection circuit 4, rotection thresholds are set
Determine circuit 5 and comparison circuit 6；The power circuit 1 is connected with dc bus 9, and the input of the microcontroller 2 is terminated with A/D
Change-over circuit 3, the input of the DC bus-bar voltage collection circuit 4 is connected with dc bus 9, and the DC bus-bar voltage is adopted
The output end of collector 4 is all connected with the input of A/D change-over circuits 3 and the input of comparison circuit 6, the comparison circuit 6
Output end of the input also with rotection thresholds initialization circuit 5 be connected, the output end of the rotection thresholds initialization circuit 5 also with A/
The input connection of D change-over circuits 3, the output of the comparison circuit 6 is terminated with overpressure vent circuit 7, the overpressure vent electricity
Road 7 is connected with dc bus 9, and the output end of the microcontroller 2 is connected with inverter circuit 8, and the inverter circuit 8 is female with direct current
Line 9 is connected；The microcontroller 2, A/D change-over circuits 3, rotection thresholds initialization circuit 5 and comparison circuit 6 with power circuit 1
Output end connection.
In the present embodiment, as shown in Fig. 2 the power circuit 1 include 15V voltage conversion circuits, 5V voltage conversion circuits,
3.3V voltage conversion circuits and 1.8V voltage conversion circuits, the 15V voltage conversion circuits include chip 7815, two poles of fast recovery
Pipe D2 and fast recovery diode D3, the 1st pin of the chip 7815 is connected by resistance R24 and fast recovery diode D2 negative electrode
Connect, and be grounded by nonpolar electric capacity C4 and polar capacitor C5 in parallel；The anode of the fast recovery diode D2 is female with direct current
Line 9 is connected, and the negative electrode of the fast recovery diode D2 is grounded by nonpolar electric capacity C3；The anode of the fast recovery diode D3
It is connected with the 3rd pin of chip 7815, the negative electrode of the fast recovery diode D3 is connected with the 1st pin of chip 7815, described
The 2nd pin ground connection of chip 7815；3rd pin of the chip 7815 is the output end VDD_ of the 15V voltage conversion circuits
15V, and be grounded by nonpolar electric capacity C8, polar capacitor C6 and polar capacitor C7 in parallel；The 5V voltage conversion circuits bag
Chip 7805 and fast recovery diode D4 are included, the 1st pin of the chip 7805 passes through resistance R25 and the 15V voltage conversions
The output end VDD_15V connections of circuit, and be grounded by nonpolar electric capacity C9 and polar capacitor C10 in parallel；The fast recovery
Diode D4 anode is connected with the 3rd pin of chip 7805, the negative electrode of the fast recovery diode D4 and the 1st of chip 7805 the
Pin is connected, the 2nd pin ground connection of the chip 7805；3rd pin of the chip 7805 is the 5V voltage conversion circuits
Output end VDD_5V, and pass through in parallel nonpolar electric capacity C14 and polar capacitor C13 ground connection；The 3.3V voltage conversions electricity
Road includes chip PS767D301, resistance R15, polar capacitor C11 and nonpolar electric capacity C12, the 1st of the chip PS767D301 the
Pin, the 5th pin, the 6th pin, the 11st pin and the 12nd pin connect with the output end VDD_5V of the 5V voltage conversion circuits
Connect, the 2nd pin of the chip PS767D301, the 3rd pin, the 7th~10 pin, the 13rd~16 pin, the 19th~21 pin,
26th pin and the 27th pin are grounded, one end of the resistance R15 and the 22nd pin and the 28th of the chip PS767D301
Pin is connected, and the negative pole of the polar capacitor C11 and nonpolar electric capacity C12 one end are grounded, and the resistance R15's is another
The other end at end, polar capacitor C11 positive pole and nonpolar electric capacity C12 connects and is the output of the 3.3V voltage conversion circuits
Hold 3.3V；The 1.8V voltage conversion circuits include chip PS767D301, resistance R16, resistance R23 and polar capacitor C15, institute
Polar capacitor C15 positive pole is stated to be connected with the 23rd pin and the 24th pin of the chip PS767D301, the resistance R23's
The 25th pin of one end and resistance R16 one end with the chip PS767D301 is connected, the negative pole of the polar capacitor C15
It is grounded with the resistance R23 other end, the positive pole of the polar capacitor C15 and resistance R16 other end connection and be described
The output end 1.8V of 1.8V voltage conversion circuits.
In the present embodiment, as shown in figure 3, the microcontroller 2 is DSP TMS320F2808, it is described
A/D change-over circuits 3 are integrated in inside the DSP TMS320F2808.When it is implemented, the microcontroller
The output end 3.3V of device 2 and A/D change-over circuits 3 with the 3.3V voltage conversion circuits is connected.
In the present embodiment, as shown in figure 5, the rotection thresholds initialization circuit 5 includes multi-turn precision potentiator VR1, precision
Fixed resister R13 and nonpolar electric capacity C1, the multi-turn precision potentiator VR1 fixing end are defeated with power circuit 1
Go out end connection, another fixing end of the multi-turn precision potentiator VR1 is connected with accurate fixed resister R13 one end, institute
Multi-turn precision potentiator VR1 sliding end is stated to be connected with nonpolar electric capacity C1 one end and be the defeated of rotection thresholds initialization circuit 5
Go out and hold VBreakSet, the other end of the accurate fixed resister R13 and the nonpolar electric capacity C1 other end are grounded；It is described
The input of the output end VBreakSet and A/D change-over circuits 3 of rotection thresholds initialization circuit 5 and the input of comparison circuit 6 are equal
Connection.When it is implemented, a fixing end of the multi-turn precision potentiator VR1 and the output of the 3.3V voltage conversion circuits
Hold 3.3V connections.
In the present embodiment, the DC bus-bar voltage collection circuit 4 includes resistor voltage divider circuit, for dc bus 9
The first signal conditioning circuit and enter to the fluctuation lower voltage limit of the voltage of dc bus 9 that the fluctuation upper voltage limit of voltage is nursed one's health
The secondary signal modulate circuit of row conditioning, first signal conditioning circuit and secondary signal modulate circuit are electric with electric resistance partial pressure
The output end connection on road.
In the present embodiment, as shown in figure 4, the resistor voltage divider circuit includes resistance R2, resistance R3 and the resistance R4 of series connection,
Resistance R2 one end is connected with dc bus 9, resistance R4 one end ground connection, and resistance R3 and resistance R4 connection end are the resistance
The output end VBus_Dsp of bleeder circuit；First signal conditioning circuit includes first operation amplifier in chip TL082
Device U1A and first operational amplifier U1A in resistance R12, the chip TL082 in-phase input end pass through resistance R8 and institute
The output end VBus_Dsp connections of resistor voltage divider circuit are stated, and are grounded by resistance R7, first fortune in the chip TL082
The inverting input for calculating amplifier U1A is grounded by resistance R9, first operational amplifier U1A's in the chip TL082
The output for first operational amplifier U1A being connected between inverting input and output end in resistance R10, the chip TL082
End is connected with resistance R12 one end, and the other end of the resistance R12 is the output end VBus_ of first signal conditioning circuit
Up；The secondary signal modulate circuit includes the second operational amplifier U1B and resistance R11 in chip TL082, the chip
The output end that the in-phase input end of second operational amplifier U1B in TL082 passes through resistance R5 and the resistor voltage divider circuit
VBus_Dsp connections, and be grounded by resistance R6, the anti-phase input of second operational amplifier U1B in the chip TL082
End is grounded by resistance R17, the inverting input of second operational amplifier U1B in the chip TL082 and output end it
Between be connected to the output end of second operational amplifier U1B in resistance R18, the chip TL082 and connect with resistance R11 one end
Connect, the other end of the resistance R11 is the output end VBus_Down of the secondary signal modulate circuit；First signal is adjusted
Manage the output end VBus_Up of circuit and the output end VBus_Down of the secondary signal modulate circuit and A/D change-over circuits 3
The input of input and comparison circuit 6 is all connected with.When it is implemented, the resistance R2, resistance R3 and resistance R4 are precision
Resistance, series connection partial pressure is carried out using resistance R2, resistance R3 and resistance R4 to the voltage of dc bus 9.First signal conditioning circuit is
Voltage change ratio is 0.0658 signal conditioning circuit, and secondary signal modulate circuit is the signal condition electricity that voltage change ratio is 0.0694
Road.
In the present embodiment, as shown in fig. 6, the comparison circuit 6 includes comparator chip LM293, resistance R14 and triode
The in-phase input end and second comparator U2B same phase of first comparator U2A in Q1, the comparator chip LM293
Input is connected with the output end VBreakSet of rotection thresholds initialization circuit 5, and first in the comparator chip LM293
Individual comparator U2A inverting input is connected with the output end VBus_Up of first signal conditioning circuit, the comparator core
The output end VBus_Down of the inverting input of second comparator U2B in piece LM293 and the secondary signal modulate circuit
The in-phase input end of first comparator U2A in connection, one end of the resistance R14 and the comparator chip LM293 and
Second comparator U2B in-phase input end is all connected with, in the other end of the resistance R14 and the comparator chip LM293
First comparator U2A output end and second comparator U2B output end be all connected with, the base stage of the triode Q1 with
First comparator U2A output end and second comparator U2B output end in the comparator chip LM293 connect
Connect, and be connected by resistance R1 with the output end of power circuit 1, the grounded emitter of the triode Q1, the triode Q1
Current collection extremely comparison circuit 6 output end BREAK, and be connected by resistance 19 with the output end of power circuit 1.Specific implementation
When, the base stage of the triode Q1 is connected by resistance R1 with the output end VDD_5V of the 5V voltage conversion circuits, and described three
Pole pipe Q1 colelctor electrode is connected by resistance 19 with the output end VDD_15V of the 15V voltage conversion circuits.The comparator core
Piece LM293 the 8th pin is connected with the output end VDD_5V of the 5V voltage conversion circuits, the comparator chip LM293's
4th pin is grounded.
In the present embodiment, as shown in fig. 7, the overpressure vent circuit 7 includes release switching tube Q2, the and of sustained diode 1
Voltage-regulator diode D5, the grid of the switching tube Q2 that releases is connected by resistance R21 with voltage-regulator diode D5 negative electrode, and is passed through
Resistance R20 is grounded, and the resistance R21 is connected with the connection end of voltage-regulator diode D5 negative electrode with the output end of comparison circuit 6, institute
The anode of the source electrode and voltage-regulator diode D5 of stating the switching tube Q2 that releases is grounded, and the drain electrode for releasing switching tube Q2 passes through resistance
R23 is connected with dc bus 9, and the resistance R22 by series connection and nonpolar electric capacity C2 ground connection, the sun of the sustained diode 1
Pole is connected with the drain electrode for the switching tube Q2 that releases, and the negative electrode of the sustained diode 1 is connected with dc bus 9.
The adjustable servo controller overvoltage of rotection thresholds of the present invention is released guard method, is comprised the following steps：
Step 1: power circuit 1 by the DC bus-bar voltage that dc bus 9 is exported to it be converted to the microcontroller 2,
Supply voltage needed for A/D change-over circuits 3, rotection thresholds initialization circuit 5 and comparison circuit 6, and changed for microcontroller 2, A/D
Circuit 3, rotection thresholds initialization circuit 5 and comparison circuit 6 are powered；
Step 2: operation protection threshold set circuit 5 sets rotection thresholds voltage VBreakSet, rotection thresholds setting electricity
The voltage that power circuit 1 is exported to it is adjusted to export after rotection thresholds voltage VBreakSet to comparison circuit 6 by road 5, together
When, rotection thresholds voltage VBreakSet is exported and carries out exporting after A/D conversions to microcontroller 2 to A/D change-over circuits 3；Specifically
It is to set rotection thresholds voltage by adjusting the multi-turn precision potentiator VR1 in rotection thresholds initialization circuit 5 during implementation
VBreakSet；
Step 3: the dc bus that the resistor voltage divider circuit in DC bus-bar voltage collection circuit 4 is exported to dc bus 9
Voltage detected in real time, the DC bus-bar voltage detected is exported in real time carried out to A/D change-over circuits 3 it is defeated after A/D conversions
Go out to microcontroller 2；Meanwhile, the resistor voltage divider circuit in DC bus-bar voltage collection circuit 4 is electric by the dc bus detected
Pressure is exported to the first signal conditioning circuit and secondary signal modulate circuit in DC bus-bar voltage collection circuit 4 simultaneously, described
Output DC bus-bar voltage is real-time after first signal conditioning circuit is nursed one's health the fluctuation upper voltage limit of the voltage of dc bus 9
Sampled value VBus_Up is to comparison circuit 6 and microcontroller 2, fluctuation of the secondary signal modulate circuit to the voltage of dc bus 9
Lower voltage limit exports the real-time sampling value VBus_Down of DC bus-bar voltage to comparison circuit 6 and microcontroller after being nursed one's health
2；
Step 4: real-time sampling value VBus_Up and VBus_Down and protection threshold of the comparison circuit 6 to DC bus-bar voltage
Threshold voltage VBreakSet is compared, when the real-time sampling value VBus_Up of DC bus-bar voltage is more than rotection thresholds voltage
During VBreakSet, the control signal BREAK that releases that comparison circuit 6 produces 5V is exported to overpressure vent circuit 7, works as dc bus
When the real-time sampling value VBus_Down of voltage is less than rotection thresholds voltage VBreakSet, comparison circuit 6 produces 0V output letter
Number export to overpressure vent circuit 7；
Step 5: when the control signal BREAK that releases that comparison circuit 6 produces 5V is exported to overpressure vent circuit 7, overvoltage
Leadage circuit 7 realizes overpressure vent defencive function, when the output signal that comparison circuit 6 produces 0V is exported to overpressure vent circuit 7
When, overpressure vent circuit 7 does not work；
Step 6: real-time sampling value VBus_Up and VBus_Down and protection threshold of the microcontroller 2 to DC bus-bar voltage
Threshold voltage VBreakSet is compared, when in calculating cycle T, when there is any one operating mode in following two operating modes, is recognized
It is set to overpressure vent circuit 7 and occurs in that failure, the control inverter circuit 8 of microcontroller 2 is stopped；
Operating mode one, rotection thresholds voltage VBreakSet are than real-time sampling value of the microcontroller 2 to DC bus-bar voltage
VBus_Up is low, and the DC bus-bar voltage that receives of microcontroller 2 is constant or lasting rises；
Operating mode two, rotection thresholds voltage VBreakSet are than real-time sampling value of the microcontroller 2 to DC bus-bar voltage
VBus_Down is high, and the DC bus-bar voltage continuous decrease that microcontroller 2 is received.
In the present embodiment, calculating cycle T described in step 6 is 1ms.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (7)
- The protection device 1. a kind of adjustable servo controller overvoltage of rotection thresholds is released, it is characterised in that：Including microcontroller (2) power circuit (1) and for each power unit in device powered, and DC bus-bar voltage collection circuit (4), rotection thresholds Initialization circuit (5) and comparison circuit (6)；The power circuit (1) is connected with dc bus (9), the microcontroller (2) it is defeated Enter to be terminated with A/D change-over circuits (3), the input of the DC bus-bar voltage collection circuit (4) is connected with dc bus (9), The output end of the DC bus-bar voltage collection circuit (4) and the input of A/D change-over circuits (3) and comparison circuit (6) it is defeated Enter end to be all connected with, the output end of the input of the comparison circuit (6) also with rotection thresholds initialization circuit (5) is connected, described to protect Input of the output end of shield threshold set circuit (5) also with A/D change-over circuits (3) is connected, the output of the comparison circuit (6) Overpressure vent circuit (7) is terminated with, the overpressure vent circuit (7) is connected with dc bus (9), the microcontroller (2) Output end is connected with inverter circuit (8), and the inverter circuit (8) is connected with dc bus (9)；The microcontroller (2), A/D The output end of change-over circuit (3), rotection thresholds initialization circuit (5) and comparison circuit (6) with power circuit (1) is connected；The DC bus-bar voltage collection circuit (4) includes resistor voltage divider circuit, for the fluctuation to dc bus (9) voltage The first signal conditioning circuit that voltage limit is nursed one's health and fluctuation lower voltage limit to dc bus (9) voltage nursed one's health Binary signal modulate circuit, the output end of first signal conditioning circuit and secondary signal modulate circuit with resistor voltage divider circuit Connection；The resistor voltage divider circuit includes resistance R2, resistance R3 and the resistance R4 of series connection, resistance R2 one end and dc bus (9) Connection, resistance R4 one end ground connection, resistance R3 and resistance R4 connection end are the output end of the resistor voltage divider circuit；Described One signal conditioning circuit is included in first operational amplifier U1A and resistance R12, the chip TL082 in chip TL082 First operational amplifier U1A in-phase input end is connected by resistance R8 with the output end of the resistor voltage divider circuit, and logical The first operational amplifier U1A crossed in resistance R7 ground connection, the chip TL082 inverting input is grounded by resistance R9, Resistance R10 is connected between the inverting input and output end of first operational amplifier U1A in the chip TL082, it is described The output end of first operational amplifier U1A in chip TL082 is connected with resistance R12 one end, and the resistance R12's is another Hold as the output end of first signal conditioning circuit；The secondary signal modulate circuit includes second in chip TL082 Operational amplifier U1B and second operational amplifier U1B in resistance R11, the chip TL082 in-phase input end pass through electricity Resistance R5 is connected with the output end of the resistor voltage divider circuit, and is grounded by resistance R6, second fortune in the chip TL082 The inverting input for calculating amplifier U1B is grounded by resistance R17, second operational amplifier U1B's in the chip TL082 The output for second operational amplifier U1B being connected between inverting input and output end in resistance R18, the chip TL082 End is connected with resistance R11 one end, and the other end of the resistance R11 is the output end of the secondary signal modulate circuit；It is described The output end of first signal conditioning circuit and the output end of the secondary signal modulate circuit and the input of A/D change-over circuits (3) The input of end and comparison circuit (6) is all connected with；The comparison circuit (6) includes comparator chip LM293, resistance R14 and triode Q1, the comparator chip LM293 In first comparator U2A in-phase input end and second comparator U2B in-phase input end with rotection thresholds set The anti-phase input of first comparator U2A in the output end VBreakSet connections of circuit (5), the comparator chip LM293 End is connected with the output end of first signal conditioning circuit, second comparator U2B's in the comparator chip LM293 Inverting input is connected with the output end of the secondary signal modulate circuit, one end of the resistance R14 and the comparator core First comparator U2A in-phase input end and second comparator U2B in-phase input end in piece LM293 are all connected with, institute The other end for stating resistance R14 is compared with the output end of first comparator U2A in the comparator chip LM293 and second Device U2B output end is all connected with, the base stage of the triode Q1 and first comparator in the comparator chip LM293 U2A output end and second comparator U2B output end are all connected with, and pass through resistance R1 and power circuit (1) output end Connection, the grounded emitter of the triode Q1, the output end of the current collection extremely comparison circuit (6) of the triode Q1, and it is logical The output end that resistance 19 is crossed with power circuit (1) is connected.
- 2. being released protection device according to the adjustable servo controller overvoltage of rotection thresholds described in claim 1, its feature exists In：The power circuit (1) includes 15V voltage conversion circuits, 5V voltage conversion circuits, 3.3V voltage conversion circuits and 1.8V electricity Voltage conversion circuit, the 15V voltage conversion circuits include chip 7815, fast recovery diode D2 and fast recovery diode D3, institute The 1st pin for stating chip 7815 is connected by resistance R24 with fast recovery diode D2 negative electrode, and passes through nonpolar electricity in parallel Hold C4 and polar capacitor C5 ground connection；The anode of the fast recovery diode D2 is connected with dc bus (9), two poles of the fast recovery Pipe D2 negative electrode is grounded by nonpolar electric capacity C3；The anode of the fast recovery diode D3 connects with the 3rd pin of chip 7815 Connect, the negative electrode of the fast recovery diode D3 is connected with the 1st pin of chip 7815, the 2nd pin ground connection of the chip 7815； 3rd pin of the chip 7815 is the output end of the 15V voltage conversion circuits, and by nonpolar electric capacity C8 in parallel, Polar capacitor C6 and polar capacitor C7 ground connection；The 5V voltage conversion circuits include chip 7805 and fast recovery diode D4, institute The 1st pin for stating chip 7805 is connected by resistance R25 with the output end of the 15V voltage conversion circuits, and passes through parallel connection Nonpolar electric capacity C9 and polar capacitor C10 ground connection；The anode of the fast recovery diode D4 connects with the 3rd pin of chip 7805 Connect, the negative electrode of the fast recovery diode D4 is connected with the 1st pin of chip 7805, the 2nd pin ground connection of the chip 7805； 3rd pin of the chip 7805 is the output end of the 5V voltage conversion circuits, and by nonpolar electric capacity C14 in parallel and Polar capacitor C13 is grounded；The 3.3V voltage conversion circuits include chip PS767D301, resistance R15, polar capacitor C11 and non- Polar capacitor C12, the chip PS767D301 the 1st pin, the 5th pin, the 6th pin, the 11st pin and the 12nd pin with The output end connection of the 5V voltage conversion circuits, the 2nd pin of the chip PS767D301, the 3rd pin, the 7th~10 are drawn Pin, the 13rd~16 pin, the 19th~21 pin, the 26th pin and the 27th pin are grounded, one end of the resistance R15 with it is described Chip PS767D301 the 22nd pin and the connection of the 28th pin, the negative pole of the polar capacitor C11 and nonpolar electric capacity C12's One end is grounded, the other end of the other end of the resistance R15, polar capacitor C11 positive pole and nonpolar electric capacity C12 connect and For the output end of the 3.3V voltage conversion circuits；The 1.8V voltage conversion circuits include chip PS767D301, resistance R16, Resistance R23 and polar capacitor C15, the 23rd pin and the 24th of the positive pole of the polar capacitor C15 and the chip PS767D301 Pin is connected, and the 25th pin of one end of the resistance R23 and resistance R16 one end with the chip PS767D301 is connected, The negative pole of the polar capacitor C15 and the resistance R23 other end are grounded, the positive pole of the polar capacitor C15 and resistance R16's The other end connects and is the output end of the 1.8V voltage conversion circuits.
- 3. being released protection device according to the adjustable servo controller overvoltage of rotection thresholds described in claim 1, its feature exists In：The microcontroller (2) is DSP TMS320F2808, and the A/D change-over circuits (3) are integrated in described Inside DSP TMS320F2808.
- 4. being released protection device according to the adjustable servo controller overvoltage of rotection thresholds described in claim 1, its feature exists In：The rotection thresholds initialization circuit (5) includes multi-turn precision potentiator VR1, precision fixed resister R13 and nonpolar electric capacity C1 a, fixing end of the multi-turn precision potentiator VR1 is connected with the output end of power circuit (1), the accurate electricity of the multi-turn Position device VR1 another fixing end is connected with accurate fixed resister R13 one end, the cunning of the multi-turn precision potentiator VR1 Moved end is connected with nonpolar electric capacity C1 one end and is the output end VBreakSet of rotection thresholds initialization circuit (5), the precision The fixed resister R13 other end and nonpolar electric capacity the C1 other end are grounded；The rotection thresholds initialization circuit (5) it is defeated Go out to hold the input of VBreakSet and A/D change-over circuits (3) and the input of comparison circuit (6) to be all connected with.
- 5. being released protection device according to the adjustable servo controller overvoltage of rotection thresholds described in claim 1, its feature exists In：The overpressure vent circuit (7) includes release switching tube Q2, sustained diode 1 and voltage-regulator diode D5, described to release out The grid for closing pipe Q2 is connected by resistance R21 with voltage-regulator diode D5 negative electrode, and is grounded by resistance R20, the resistance R21 It is connected with the connection end of voltage-regulator diode D5 negative electrode with the output end of comparison circuit (6), the source electrode of the switching tube Q2 that releases It is grounded with voltage-regulator diode D5 anode, the drain electrode of the switching tube Q2 that releases is connected by resistance R23 and dc bus (9) Connect, and resistance R22 and nonpolar electric capacity C2 ground connection, the anode of the sustained diode 1 and the switching tube Q2 that releases by series connection Drain electrode connection, the negative electrode of the sustained diode 1 is connected with dc bus (9).
- 6. one kind is released guarantor using device as claimed in claim 1 to the servo controller progress adjustable overvoltage of rotection thresholds The method of shield, it is characterised in that this method comprises the following steps：Step 1: power circuit (1) exports dc bus (9) is converted to the microcontroller to its DC bus-bar voltage (2), the supply voltage needed for A/D change-over circuits (3), rotection thresholds initialization circuit (5) and comparison circuit (6), and be microcontroller Device (2), A/D change-over circuits (3), rotection thresholds initialization circuit (5) and comparison circuit (6) power supply；Step 2: operation protection threshold set circuit (5) sets rotection thresholds voltage VBreakSet, rotection thresholds initialization circuit (5) power circuit (1) is exported to be adjusted to export after rotection thresholds voltage VBreakSet to its voltage and gives comparison circuit (6), Meanwhile, rotection thresholds voltage VBreakSet is exported and exported after carrying out A/D conversions to A/D change-over circuits (3) to microcontroller (2)；Step 3: the dc bus that the resistor voltage divider circuit in DC bus-bar voltage collection circuit (4) is exported to dc bus (9) Voltage is detected in real time, and the DC bus-bar voltage detected is exported in real time and carried out to A/D change-over circuits (3) after A/D conversions Export and give microcontroller (2)；Meanwhile, resistor voltage divider circuit in DC bus-bar voltage collection circuit (4) is by the direct current detected Busbar voltage is exported to the first signal conditioning circuit in DC bus-bar voltage collection circuit (4) and secondary signal conditioning electricity simultaneously Road, first signal conditioning circuit exports dc bus after nursing one's health the fluctuation upper voltage limit of dc bus (9) voltage The real-time sampling value VBus_Up of voltage is to comparison circuit (6) and microcontroller (2), and the secondary signal modulate circuit is to direct current The fluctuation lower voltage limit of bus (9) voltage exported after being nursed one's health DC bus-bar voltage real-time sampling value VBus_Down give than Compared with circuit (6) and microcontroller (2)；Step 4: real-time sampling value VBus_Up and VBus_Down and rotection thresholds of the comparison circuit (6) to DC bus-bar voltage Voltage VBreakSet is compared, when the real-time sampling value VBus_Up of DC bus-bar voltage is more than rotection thresholds voltage During VBreakSet, comparison circuit (6) the generation 5V control signal BREAK that releases, which is exported, gives overpressure vent circuit (7), works as direct current When the real-time sampling value VBus_Down of busbar voltage is less than rotection thresholds voltage VBreakSet, comparison circuit (6) produces 0V's Output signal, which is exported, gives overpressure vent circuit (7)；Step 5: when the control signal BREAK that releases that comparison circuit (6) produces 5V is exported to overpressure vent circuit (7), overvoltage Leadage circuit (7) realizes overpressure vent defencive function, and overpressure vent electricity is given when the output signal that comparison circuit (6) produces 0V is exported During road (7), overpressure vent circuit (7) does not work；Step 6: real-time sampling value VBus_Up and VBus_Down and rotection thresholds of the microcontroller (2) to DC bus-bar voltage Voltage VBreakSet is compared, when in calculating cycle T, when there is any one operating mode in following two operating modes, is assert Failure is occurred in that for overpressure vent circuit (7), microcontroller (2) control inverter circuit (8) is stopped；Operating mode one, rotection thresholds voltage VBreakSet are than real-time sampling value VBus_ of the microcontroller (2) to DC bus-bar voltage Up is low, and the DC bus-bar voltage that receives of microcontroller (2) is constant or lasting rises；Operating mode two, rotection thresholds voltage VBreakSet are than real-time sampling value VBus_ of the microcontroller (2) to DC bus-bar voltage Down is high, and the DC bus-bar voltage continuous decrease that microcontroller (2) is received.
- 7. in accordance with the method for claim 6, it is characterised in that：Calculating cycle T described in step 6 is 1ms.
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| CN107901762B (en) * | 2017-11-06 | 2020-07-03 | 北京长城华冠汽车科技股份有限公司 | Electric automobile discharge failure processing method and system |
| CN110859506A (en) * | 2018-08-27 | 2020-03-06 | 佛山市顺德区美的电热电器制造有限公司 | Detection circuit, system and control method of cooking appliance and cooking appliance |
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