CN208174594U - A kind of motor driven protective device and air conditioner - Google Patents
A kind of motor driven protective device and air conditioner Download PDFInfo
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- CN208174594U CN208174594U CN201820328956.8U CN201820328956U CN208174594U CN 208174594 U CN208174594 U CN 208174594U CN 201820328956 U CN201820328956 U CN 201820328956U CN 208174594 U CN208174594 U CN 208174594U
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Abstract
The utility model provides a kind of motor driven protective device and air conditioner, is related to motor control technology field.Pass through setting first diode and switch module; and switch module connect with first diode after it is in parallel with dc-link capacitance; to when there is negative voltage in DC bus-bar voltage; it is the forward conduction voltage of first diode by negative voltage clamper by first diode, protection is connected to other devices of DC bus and is not damaged；In addition; pass through setting first control circuit and electrical parameter detection circuit; first control circuit is electrically connected with absorbing circuit; and by first control circuit judge electrical parameter detection circuit detection DC bus-bar voltage whether be greater than supply voltage peak value and presetting voltage threshold and; if it is; then the conducting of control switch module is to reduce DC bus-bar voltage; to in current bus bar overtension; voltage can be absorbed by absorbing circuit, increase the service life of motor driven protective device and air conditioner.
Description
Technical field
The utility model relates to motor control technology field, in particular to a kind of motor driven protective device and air conditioner.
Background technique
In traditional frequency changing driving system, mostly use pfc circuit and big electrolytic capacitor as dc-link capacitance greatly, but
Since its volume is larger, and the requirement with user to properties of product, appearance, volume, capacity lesser capacitor generation is mostly used greatly
For pfc circuit and big electrolytic capacitor, and power factor is controlled by control power of motor.
But since inverter circuit DC bus is without big electrolytic capacitor, when motor stopping process or system exception, is likely to occur
The problem of DC bus-bar voltage overshoots, this easilys lead to small capacitances damage, and leads to frequency changing driving system cisco unity malfunction.
Utility model content
In view of this, the utility model is directed to a kind of absorbing circuit, motor driven protective device and air conditioner, with solution
The certainly above problem.
Utility model is in a first aspect, the utility model embodiment provides a kind of motor driven protective device, the motor
Driving protective device include：Rectification circuit, dc-link capacitance, inverter circuit, motor, first control circuit, the second control electricity
Road, electrical parameter detection circuit and absorbing circuit, the absorbing circuit include switch module, first diode and first resistor,
Second pole of the switch module is electrically connected with the anode of the first diode, the first resistor and the first diode
Parallel connection, the switch module connect it is in parallel with the dc-link capacitance after the first diode, it is the rectification circuit, described
Dc-link capacitance, the absorbing circuit, the inverter circuit and the motor are sequentially connected electrically, the first control circuit
It is electrically connected with the first pole of the switch module and the electrical parameter detection circuit, the second control circuit and the inverter circuit
Electrical connection, the electrical parameter detection circuit are electrically connected with the input terminal of the rectification circuit and the dc-link capacitance；
The rectification circuit is used to the alternating current of input being converted to direct current；
The second control circuit is for controlling the inverter circuit to drive the motor operation；
The electrical parameter detection circuit is for detecting DC bus-bar voltage and supply voltage peak value, and by the DC bus
Voltage and the supply voltage peak transmission are to the first control circuit；
The first control circuit is used to be greater than the supply voltage peak value and presetting when the DC bus-bar voltage
Voltage threshold and when, control switch module conducting to reduce the DC bus-bar voltage.
Further, the first control circuit is also used to be less than or equal to the power supply electricity when the DC bus-bar voltage
Voltage crest value and presetting voltage threshold and when, control the switch module cut-off.
Further, the absorbing circuit further includes the second diode, and second diode is connected anti-parallel to described open
It closes between the second pole of module and the third pole of the switch module.
Further, the electrical parameter detection circuit includes voltage peak detection module and busbar voltage detection module, institute
It states voltage peak detection module and the busbar voltage detection module is electrically connected with the first control circuit；
The voltage peak detection module is for detecting the supply voltage peak value and by the supply voltage peak transmission
To the first control circuit；
The busbar voltage detection module is for detecting the DC bus-bar voltage and transmitting the DC bus-bar voltage
To the first control circuit.
Further, the voltage peak detection module includes the second diode, second resistance and first capacitor, described
The anode of second diode is electrically connected with the input terminal of the rectification circuit, the cathode series connection described first of second diode
It is grounded after capacitor, the second resistance is in parallel with the first capacitor, and the cathode of second diode is also controlled with described first
Circuit electrical connection processed.
Further, the motor driven protective device further includes voltage threshold generative circuit, and the voltage threshold generates
Circuit includes the first operational amplifier, the second operation for generating the presetting voltage threshold, the first control circuit
Amplifier, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, voltage peak detection module series connection described the
It is electrically connected after three resistance with the normal phase input end of first operational amplifier, voltage threshold generative circuit series connection described the
It is electrically connected after four resistance with the normal phase input end of first operational amplifier, the inverting input terminal of first operational amplifier
It is electrically connected by the 5th resistance eutral grounding, and by the signal output end of the 6th resistance and first operational amplifier
It connects, the signal output end of first operational amplifier is electrically connected with the inverting input terminal of the second operational amplifier, described
The normal phase input end of second operational amplifier is electrically connected with the busbar voltage detection module, the letter of the second operational amplifier
Number output end is electrically connected with the first pole of the switch module.
Second aspect, the utility model embodiment additionally provides a kind of air conditioner, including motor driven protective device, described
Motor driven protective device includes：Rectification circuit, dc-link capacitance, absorbing circuit, inverter circuit, motor, the first control electricity
Road, second control circuit and electrical parameter detection circuit, the absorbing circuit include switch module, the rectification circuit, described straight
Stream bus capacitor, the absorbing circuit, the inverter circuit and the motor are sequentially connected electrically, the first control circuit with
First pole of the switch module and the electrical parameter detection circuit are electrically connected, the second control circuit and the inverter circuit
Electrical connection, the electrical parameter detection circuit are electrically connected with the input terminal of the rectification circuit and the dc-link capacitance；
The rectification circuit is used to the alternating current of input being converted to direct current；
The second control circuit is for controlling the inverter circuit to drive the motor operation；
The electrical parameter detection circuit is for detecting DC bus-bar voltage and supply voltage peak value, and by the DC bus
Voltage and the supply voltage peak transmission are to the first control circuit；
The first control circuit is used to be greater than the supply voltage peak value and presetting when the DC bus-bar voltage
Voltage threshold and when, control switch module conducting.
In order to achieve the above objectives, the technical solution of the utility model is realized in：
By setting first diode and switch module, and switch module connect with first diode after with DC bus
Capacitor is in parallel, by negative voltage clamper is the one or two pole by first diode thus when negative voltage occurs in DC bus-bar voltage
The forward conduction voltage of pipe, other devices that protection is connected to DC bus are not damaged；In addition, passing through setting the first control electricity
Road, absorbing circuit and electrical parameter detection circuit, and absorbing circuit is in parallel with dc-link capacitance, first control circuit and absorption electricity
Road electrical connection, and the DC bus-bar voltage that will test by electrical parameter detection circuit and supply voltage peak transmission are controlled to first
Circuit processed judges whether DC bus-bar voltage is greater than supply voltage peak value and presetting voltage threshold by first control circuit
With, if it is, control switch module conducting to reduce DC bus-bar voltage, to can lead in current bus bar overtension
It crosses absorbing circuit to absorb voltage, realizes the inhibition to DC bus-bar voltage, current bus bar overtension is avoided to cause
Circuit components damage, increase the service life of motor driven protective device and air conditioner.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new
The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.?
In attached drawing：
Fig. 1 is the circuit structure block diagram of motor driven protective device described in the utility model embodiment.
Fig. 2 is the circuit diagram of motor driven protective device described in the utility model embodiment.
Fig. 3 is the circuit diagram of voltage peak detection module described in the utility model embodiment.
Fig. 4 is the circuit diagram of first control circuit described in the utility model embodiment.
Fig. 5 is the flow chart of over-voltage protection method described in the utility model embodiment.
Fig. 6 is the functional block diagram of over-pressure safety device described in the utility model embodiment.
Icon：100- motor driven protective device；1- rectification circuit；2- dc-link capacitance；3- absorbing circuit；4- ginseng
Number detection circuit；41- voltage transformer；42- voltage peak detection module；43- busbar voltage detection module；5- first controls electricity
Road；6- inverter circuit；7- second control circuit；8- motor；200- over-pressure safety device；210- parameter receiving unit；220- sentences
Disconnected unit；230- control unit.
Specific embodiment
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations
Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below
The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model
Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
First embodiment
The utility model embodiment provides a kind of motor driven protective device 100, runs for driving motor 8, and press down
DC bus-bar voltage processed keeps DC bus-bar voltage in the normal range, it is ensured that motor 8 operates normally.Referring to Fig. 1, being
The circuit structure block diagram of motor driven protective device 100 provided by the embodiment of the utility model.The motor driven protective device 100
It is controlled including rectification circuit 1, dc-link capacitance 2, absorbing circuit 3, inverter circuit 6, motor 8, first control circuit 5, second
Circuit 7 and electrical parameter detection circuit 4, wherein rectification circuit 1, dc-link capacitance 2, absorbing circuit 3, inverter circuit 6 and electricity
Machine 8 is sequentially connected electrically, and first control circuit 5 is electrically connected with absorbing circuit 3 and electrical parameter detection circuit 4, second control circuit 7 with it is inverse
Power transformation road 6 is electrically connected, and electrical parameter detection circuit 4 is electrically connected with the input terminal of rectification circuit 1 and dc-link capacitance 2.
Wherein, rectification circuit 1 is used to the alternating current of input being converted to direct current.
Absorbing circuit 3 is for absorbing the extra electricity of dc-link capacitance 2 when DC bus-bar voltage is excessive.
Referring to Fig. 2, being the circuit diagram of motor driven protective device 100 provided by the embodiment of the utility model.Absorb electricity
Road 3 includes switch module, first resistor R1, first diode D1 and the second diode D2.First pole of switch module and the
The electrical connection of one control circuit 5, switch module is in parallel with dc-link capacitance 2 after connecting with first diode D1, switch module
Second pole is electrically connected with the anode of first diode D1, and the third pole of switch module is electrically connected with dc-link capacitance 2, the first electricity
Resistance R1 is in parallel with first diode D1, and the second diode D2 is connected anti-parallel between the second pole of switch module and third pole.
In a kind of preferred embodiment, switch module is metal-oxide-semiconductor, at this point, the grid of the first of switch module the extremely metal-oxide-semiconductor
Pole, the second of switch module extremely drain, the third of switch module extremely source electrode.
In another preferred embodiment, switch module is triode, at this point, the first of switch module the extremely triode
Base stage, the extremely collector of the second of switch module, the third of switch module extremely emitter.
It is to be appreciated that when switch module conducting, the electricity of DC bus-bar voltage can pass through first resistor R1 and the
One diode D1 consumes part electricity, to reduce the size of DC bus-bar voltage；When switch module cut-off, absorbing circuit
3 are in off state, will not impact to the size of DC bus-bar voltage.
In addition, it should be noted that, due to the characteristic of diode unilateral conduction, thus by the way that first diode D1 is arranged,
It may make to be greater than in absorbing circuit 3 by the electric current that switch module flow to the direction first resistor R1 and switching molding flow to by first resistor R1
The electric current of Block direction, enables switch module normally.
In addition it is also necessary to which explanation may make by the way that first diode D1 and the second diode D2 is arranged and work as direct current
When negative voltage occurs in busbar voltage, being connected using first diode D1 and the second diode D2 by negative voltage clamper is the one or two
The forward conduction voltage of pole pipe D1 and the second diode D2, other devices that protection is connected to DC bus are not damaged.
Electrical parameter detection circuit 4 for detecting DC bus-bar voltage and supply voltage peak value, and by DC bus-bar voltage with
And supply voltage peak transmission is to first control circuit 5.
In a kind of preferred embodiment, electrical parameter detection circuit 4 includes voltage transformer 41, voltage peak detection module 42
And busbar voltage detection module 43, voltage transformer 41 are electrically connected with voltage peak detection module 42, voltage peak detects mould
Block 42 and busbar voltage detection module 43 are electrically connected with first control circuit 5.
Wherein, voltage transformer 41 is for detecting supply voltage and supply voltage being transmitted to voltage peak detection module
42；Voltage peak detection module 42 is for detecting supply voltage peak value and by supply voltage peak transmission to first control circuit 5；
Busbar voltage detection module 43 is for detecting DC bus-bar voltage and DC bus-bar voltage being transmitted to first control circuit 5.
Referring to Fig. 3, being the circuit diagram of voltage peak detection module 42.The voltage peak detection module 42 includes second
Diode D2, second resistance R2 and first capacitor C1, the input terminal of the anode and rectification circuit 1 of the second diode D2 are electrically connected
It connects, is grounded after the cathode series connection first capacitor C1 of the second diode D2, second resistance R2 is in parallel with first capacitor C1, the two or two pole
The cathode of pipe D2 is also electrically connected with first control circuit 5.
First control circuit 5 be used for when DC bus-bar voltage be greater than supply voltage peak value and presetting voltage threshold and
When, control switch module conducting, to reduce DC bus-bar voltage；And for being less than or equal to power supply electricity when DC bus-bar voltage
Voltage crest value and presetting voltage threshold and when, the cut-off of control switch module.
It should be noted that motor driven protective device 100 further includes that voltage threshold is raw in the utility model embodiment
At circuit, voltage threshold generative circuit is for generating presetting voltage threshold.
Referring to Fig. 4, being the circuit diagram of first control circuit 5.First control circuit 5 include the first operational amplifier U1,
Second operational amplifier U2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, voltage peak detection
It is electrically connected after the series connection of module 42 3rd resistor R3 with the normal phase input end of the first operational amplifier U1, voltage threshold generative circuit
It connects and is electrically connected with the normal phase input end of the first operational amplifier U1 after the 4th resistance R4, the reverse phase of the first operational amplifier U1 is defeated
Enter end to be grounded by the 5th resistance R5, and be electrically connected by the 6th resistance R6 with the signal output end of the first operational amplifier U1,
The signal output end of first operational amplifier U1 is electrically connected with the inverting input terminal of second operational amplifier U2, the second operation amplifier
The normal phase input end of device U2 is electrically connected with busbar voltage detection module 43, the signal output end and switch of second operational amplifier U2
First pole of module is electrically connected.
It is to be appreciated that the first operational amplifier U1 for serving as adder, can calculate supply voltage peak value with it is presetting
Voltage threshold sum；Second operational amplifier U2 is equivalent to comparator, works as DC bus-bar voltage and supply voltage for comparing
Peak value and presetting voltage threshold and size, and be greater than supply voltage peak value and presetting when DC bus-bar voltage
Voltage threshold and when, export high level signal, thus control switch module conducting to reduce DC bus-bar voltage；Working as direct current
Busbar voltage be less than or equal to supply voltage peak value and presetting voltage threshold and when, export low level signal, control is opened
Close module cut-off.
Inverter circuit 6 is used to the direct current that rectification circuit 1 inputs being converted to three-phase alternating current, with the operation of driving motor 8.
Second control circuit 7 is for generating pulse-width signal to realize the control to inverter circuit 6, thus driving motor
8 operations.
Second embodiment
The utility model embodiment provides a kind of over-voltage protection method, the first control provided applied to first embodiment
Circuit 5 is used for real-time monitoring DC bus-bar voltage, and ensures DC bus-bar voltage in safe range.By force refering to Fig. 5, for this
A kind of flow chart for over-voltage protection method that utility model preferred embodiment provides.The over-voltage protection method includes：
Step S501：Receive DC bus-bar voltage and supply voltage peak value that electrical parameter detection circuit 4 is detected and transmitted.
Electrical parameter detection circuit 4 includes voltage transformer 41, voltage peak detection module 42 and busbar voltage detection module
43, voltage peak detection module 42 and busbar voltage detection module 43 are electrically connected with first control circuit 5.
Wherein, voltage transformer 41 is for detecting supply voltage and supply voltage being transmitted to voltage peak detection module
42；Voltage peak detection module 42 is for detecting supply voltage peak value and by supply voltage peak transmission to first control circuit 5；
Busbar voltage detection module 43 is for detecting DC bus-bar voltage and DC bus-bar voltage being transmitted to first control circuit 5.
Step S502：Judge DC bus-bar voltage whether be greater than supply voltage peak value and presetting voltage threshold and,
If so, thening follow the steps S503；If it is not, then step S504.
If using the sum of supply voltage peak value and presetting voltage threshold as judging whether DC bus-bar voltage is excessive
Threshold value.
Normally, which is fixed value, but when the systems are operating normally, when input voltage increases, DC bus-bar voltage
And supply voltage peak value will increase therewith, DC bus-bar voltage is just likely to be greater than the threshold value at this time, causes switch module
It misleads, input supply voltage is loaded on first resistor R1 at this time, leads to the excessive damage of power, Huo Zhezao on first resistor R1
Increase at system loss power.
In the utility model embodiment, when input voltage increases, which is consequently increased, so as to avoid often
The case where switch module occurred in rule technology misleads makes system loss power maintain lesser state.
Step S503：Control switch module is connected to reduce DC bus-bar voltage.
When DC bus-bar voltage be greater than supply voltage peak value and presetting voltage threshold and when, control switch module is led
Logical, the electricity of DC bus-bar voltage can consume part electricity by first resistor R1 and first diode D1, to reduce
The size of DC bus-bar voltage.
Step S504：The cut-off of control switch module.
When DC bus-bar voltage be greater than supply voltage peak value and presetting voltage threshold and when, control switch module is cut
Only, absorbing circuit 3 is in off state, will not impact to the size of DC bus-bar voltage.
3rd embodiment
Referring to Fig. 6, Fig. 6 is a kind of function mould for over-pressure safety device 200 that the utility model preferred embodiment provides
Block figure.It should be noted that over-pressure safety device 200 provided by the present embodiment, are applied to first control circuit 5, it is basic
Principle and the technical effect of generation are identical with above-described embodiment, and to briefly describe, the present embodiment part does not refer to place, can refer to
Corresponding contents in the above embodiments.Over-pressure safety device 200 provided by the embodiment of the utility model includes：Parameter receiving unit
210, judging unit 220 and control unit 230.
Wherein, parameter receiving unit 210 be used to receive electrical parameter detection circuit 4 detect and the DC bus-bar voltage that transmits and
Supply voltage peak value.
It is to be appreciated that parameter receiving unit 210 can be used for executing step S501 in a kind of preferred embodiment.
Step S502：Judging unit 220 for judge DC bus-bar voltage whether be greater than supply voltage peak value with it is presetting
Voltage threshold sum.
It is to be appreciated that judging unit 220 can be used for executing step S502 in a kind of preferred embodiment.
Control unit 230 be used for when DC bus-bar voltage be greater than supply voltage peak value and presetting voltage threshold and
When, the conducting of control switch module；And for being less than or equal to supply voltage peak value and presetting electricity when DC bus-bar voltage
Press threshold value and when, control switch module cut-off.
It is to be appreciated that in a kind of preferred embodiment, parameter receiving unit 210 can be used for executing step S503 and
Step S504.
Fourth embodiment
The utility model embodiment provides a kind of air conditioner, which includes the motor drive that first embodiment provides
Dynamic protective device 100.
In conclusion the utility model embodiment provides a kind of motor driven protective device and air conditioner, pass through setting
First diode and switch module, and switch module connect with first diode after it is in parallel with dc-link capacitance, to work as
It is by first diode that the forward conduction that negative voltage clamper is first diode is electric when negative voltage occurs in DC bus-bar voltage
Pressure, other devices that protection is connected to DC bus are not damaged；In addition, by setting first control circuit, absorbing circuit with
And electrical parameter detection circuit, and absorbing circuit is in parallel with dc-link capacitance, first control circuit is electrically connected with absorbing circuit, and is led to
DC bus-bar voltage and supply voltage peak transmission that electrical parameter detection circuit will test are crossed to first control circuit, by first
Control circuit judge DC bus-bar voltage whether be greater than supply voltage peak value and presetting voltage threshold and, if it is,
Control switch module is connected to reduce DC bus-bar voltage, to can pass through absorbing circuit pair in current bus bar overtension
Voltage is absorbed, and the inhibition to DC bus-bar voltage is realized, and avoids circuit components caused by current bus bar overtension
Damage, increases the service life of motor driven protective device and air conditioner.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (7)
1. a kind of motor driven protective device, which is characterized in that the motor driven protective device includes：Rectification circuit, direct current
Bus capacitor, inverter circuit, motor, first control circuit, second control circuit, electrical parameter detection circuit and absorbing circuit, institute
Stating absorbing circuit includes switch module, first diode and first resistor, the second pole of the switch module and described first
The anode of diode is electrically connected, and the first resistor is in parallel with the first diode, the switch module series connection described first
It is in parallel with the dc-link capacitance after diode, the rectification circuit, the dc-link capacitance, the absorbing circuit, institute
It states inverter circuit and the motor is sequentially connected electrically, the first pole of the first control circuit and the switch module and described
Electrical parameter detection circuit electrical connection, the second control circuit are electrically connected with the inverter circuit, the electrical parameter detection circuit and institute
State input terminal and the dc-link capacitance electrical connection of rectification circuit；
The rectification circuit is used to the alternating current of input being converted to direct current；
The second control circuit is for controlling the inverter circuit to drive the motor operation；
The electrical parameter detection circuit is for detecting DC bus-bar voltage and supply voltage peak value, and by the DC bus-bar voltage
And the supply voltage peak transmission is to the first control circuit；
The first control circuit is used to be greater than the supply voltage peak value and presetting voltage when the DC bus-bar voltage
Threshold value and when, control switch module conducting.
2. motor driven protective device according to claim 1, which is characterized in that the first control circuit is also used to work as
The DC bus-bar voltage be less than or equal to the supply voltage peak value and presetting voltage threshold and when, open described in control
Close module cut-off.
3. motor driven protective device according to claim 1 or 2, which is characterized in that the absorbing circuit further includes
Two diodes, second diode be connected anti-parallel to the switch module the second pole and the switch module third pole it
Between.
4. motor driven protective device according to claim 1 or 2, which is characterized in that the electrical parameter detection circuit includes
Voltage peak detection module and busbar voltage detection module, the voltage peak detection module and the busbar voltage detection
Module is electrically connected with the first control circuit；
The voltage peak detection module is for detecting the supply voltage peak value and by the supply voltage peak transmission to institute
State first control circuit；
The busbar voltage detection module is for detecting the DC bus-bar voltage and the DC bus-bar voltage being transmitted to institute
State first control circuit.
5. motor driven protective device according to claim 4, which is characterized in that the voltage peak detection module includes
Second diode, second resistance and first capacitor, the anode of second diode and the input terminal electricity of the rectification circuit
It connects, is grounded after the cathode series connection first capacitor of second diode, the second resistance and the first capacitor are simultaneously
Connection, the cathode of second diode are also electrically connected with the first control circuit.
6. motor driven protective device according to claim 4, which is characterized in that the motor driven protective device is also wrapped
Including voltage threshold generative circuit, the voltage threshold generative circuit is for generating the presetting voltage threshold, and described first
Control circuit includes the first operational amplifier, second operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance and the 6th
Resistance, the voltage peak detection module connect after the 3rd resistor with the normal phase input end of first operational amplifier electricity
Connection, the voltage threshold generative circuit connect after the 4th resistance with the normal phase input end of first operational amplifier electricity
Connection, the inverting input terminal of first operational amplifier by the 5th resistance eutral grounding, and by the 6th resistance with
The signal output end of first operational amplifier is electrically connected, the signal output end of first operational amplifier and described second
The inverting input terminal of operational amplifier is electrically connected, the normal phase input end of the second operational amplifier and the busbar voltage detection
Module electrical connection, the signal output end of the second operational amplifier are electrically connected with the first pole of the switch module.
7. a kind of air conditioner, which is characterized in that including the motor driven protective device as described in any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820328956.8U CN208174594U (en) | 2018-03-09 | 2018-03-09 | A kind of motor driven protective device and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820328956.8U CN208174594U (en) | 2018-03-09 | 2018-03-09 | A kind of motor driven protective device and air conditioner |
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| CN208174594U true CN208174594U (en) | 2018-11-30 |
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| CN201820328956.8U Active CN208174594U (en) | 2018-03-09 | 2018-03-09 | A kind of motor driven protective device and air conditioner |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322128A (en) * | 2018-03-09 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of motor driving protective device, over-voltage protection method, device and air conditioner |
| CN109921652A (en) * | 2019-03-12 | 2019-06-21 | 广东美的制冷设备有限公司 | Motor feed circuit and household electrical appliance with it |
| CN112019027A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN112019028A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN113644630A (en) * | 2021-09-17 | 2021-11-12 | 锦浪科技股份有限公司 | Method for coping with half-bus short-circuit fault of three-level inverter circuit |
| CN115954851A (en) * | 2023-03-15 | 2023-04-11 | 三峡智控科技有限公司 | Direct current bus overvoltage protection circuit and monitoring and control method thereof |
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2018
- 2018-03-09 CN CN201820328956.8U patent/CN208174594U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108322128A (en) * | 2018-03-09 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of motor driving protective device, over-voltage protection method, device and air conditioner |
| CN109921652A (en) * | 2019-03-12 | 2019-06-21 | 广东美的制冷设备有限公司 | Motor feed circuit and household electrical appliance with it |
| CN112019027A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN112019028A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN113644630A (en) * | 2021-09-17 | 2021-11-12 | 锦浪科技股份有限公司 | Method for coping with half-bus short-circuit fault of three-level inverter circuit |
| CN115954851A (en) * | 2023-03-15 | 2023-04-11 | 三峡智控科技有限公司 | Direct current bus overvoltage protection circuit and monitoring and control method thereof |
| CN115954851B (en) * | 2023-03-15 | 2023-05-16 | 三峡智控科技有限公司 | Direct-current bus overvoltage protection circuit and monitoring and control method thereof |
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