CN107611931A - A kind of circuit that complete series compressor protection is realized by changing comparison voltage method - Google Patents
A kind of circuit that complete series compressor protection is realized by changing comparison voltage method Download PDFInfo
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- CN107611931A CN107611931A CN201710716630.2A CN201710716630A CN107611931A CN 107611931 A CN107611931 A CN 107611931A CN 201710716630 A CN201710716630 A CN 201710716630A CN 107611931 A CN107611931 A CN 107611931A
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Abstract
The invention discloses a kind of circuit that complete series compressor protection is realized by changing comparison voltage method, including sampling resistor circuit, two-way comparison circuit, MCU, DAC module, logic circuit, LOCK lock-in circuits.This reality invents the protection control circuit; for the application circuit of frequency conversion refrigerator, variable-frequency washing machine, convertible frequency air-conditioner and servo-drive system drive control device design; it is unlikely to burn controller or motor when electric machine control system or motor occur abnormal, this circuit can improve the security and reliability of control system as protection use.Protection circuit advantage of the present invention is can to detect drive system running current; protection point can arbitrarily be set, and can be controlled when electric current occurs abnormal not against MCU and independently be turned off locking system, go for the protection of complete series press; guard time is short, protection it is more reliable, using more flexible.
Description
Technical field
The invention belongs to field of circuit technology, and more specifically, more particularly to one kind is by changing comparison voltage method reality
The circuit of existing complete series compressor protection.
Background technology
At present, the controller used in VFC industry is nonshared control unit, universal not strong, each producer's direct current
The demagnetization current difference of brushless electric machine so as to cause the relevant parameter needs of controller hardware current foldback circuit carry out matching
It can use, otherwise can cause motor damage.This programme effectively solves the problems, such as that controller is universal, increases DAC in circuit
Conversion module, for the comparison reference for exporting different voltage to adjust in protection circuit, so as to each press
Protection value is matched.Also original protection circuit reliability is greatly improved simultaneously, conventional scheme is hardware
Send fault-signal and stop motor to MCU, MCU.This case increases to associated hardware logic circuit, when hardware sends failure letter
After number, motor can be stopped not against MCU, hardware circuit operating alone.
In consideration of it, special propose present patent application.
The content of the invention
The invention aims to solve shortcoming present in prior art, and propose a kind of more electric by changing
Pressure method realizes the circuit of complete series compressor protection.
To achieve the above object, the present invention provides following technical scheme：One kind realizes complete series by changing comparison voltage method
The circuit of compressor protection, including AC input circuit, the AC input circuit are electrically connected with EMI filter circuit, the EMI filters
Wave circuit and rectifying and wave-filtering DC BUS circuits are electrically connected with, the rectifying and wave-filtering DC BUS circuits respectively with drive circuit and SMPS
It is electrically connected with, the drive circuit is electrically connected with DC MOTOR modules, and the drive circuit is electrically connected with sampling resistor, institute
State sampling resistor to be electrically connected with comparison circuit 1, comparison circuit 2 and rotor-position feedback circuit respectively, the He of comparison circuit 1
Comparison circuit 2 is electrically connected with logic circuit, and the rotor-position feedback circuit is electrically connected with MCU, the MCU and logic
Circuit is electrically connected with, and the MCU is electrically connected with DAC module, and the DAC module is electrically connected with comparison circuit 1, the driving
Circuit is electrically connected with logic circuit, and the logic circuit is electrically connected with LOCK lock-in circuits, the MCU and LOCK locking electricity
Road is electrically connected with, and the LOCK lock-in circuits are electrically connected with drive circuit, and the SMPS and MCU is electrically connected with, the SMPS
It is electrically connected with LOCK lock-in circuits.
Preferably, described drive circuit is IPM or discrete power drive circuit.
Preferably, described sample circuit 1 and sample circuit 2 are used for gathering drive circuit running current, for detecting motor
The operation conditions of system.
Preferably, described MCU is used for setting the output voltage of DAC module, reset enabled logic interlock circuit and resetting locking
Circuit.
Preferably, described DAC module is used for setting different comparison reference voltages to comparison circuit 1, for different compressors
Demagnetization current difference is so as to causing to protect the different demand of voltage.
Preferably, described comparison circuit 1 is used for the analog signal above sampling resistor being converted to logical signal, and it compares ginseng
Voltage is examined to be set by DAC module.
Preferably, described comparison circuit 2 is used for the analog signal above sampling resistor being converted to logical signal, and it compares ginseng
Examine the fixed value that voltage is hardware setting.
Preferably, described logic circuit is used for the interrelated logic letter for handling conversion comparison circuit 1, comparison circuit 2 and MCU are sent
Number.
Preferably, described LCOK lock-in circuits are used for the coherent signal for turning off MCU control drive circuits.
The technique effect and advantage of the present invention：One kind provided by the invention realizes that complete series is compressed by changing comparison voltage method
The circuit of machine protection, it is therefore intended that improve versatility and the flexibility of controller, while carried out to original protection circuit excellent
Change, the reliability and safety of system greatly improved.
Brief description of the drawings
Fig. 1 is the Frequency Drive Control block diagram of the present invention；
Fig. 2 is the sample circuit figure of the present invention；
Fig. 3 is the comparison circuit 1 and DAC module circuit diagram of the present invention；
Fig. 4 is the circuit diagram of comparison circuit 2 of the present invention；
Fig. 5 is the logical circuitry of the present invention；
Fig. 6 is the control signal lock-in circuit circuit diagram of the present invention；
Fig. 7 is the power supply lock-in circuit circuit diagram of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.Based on the embodiment in the present invention, those of ordinary skill in the art are not before creative work is made
The every other embodiment obtained is put, belongs to the scope of protection of the invention.
The invention provides a kind of electricity that complete series compressor protection is realized by changing comparison voltage method as shown in figs. 1-7
Road, including AC input circuit, the AC input circuit are electrically connected with EMI filter circuit, and the EMI filter circuit is filtered with rectification
Ripple DC BUS circuits are electrically connected with, and the rectifying and wave-filtering DC BUS circuits are electrically connected with drive circuit and SMPS respectively, described
Drive circuit is electrically connected with DC MOTOR modules, and the drive circuit is electrically connected with sampling resistor, the sampling resistor point
It is not electrically connected with comparison circuit 1, comparison circuit 2 and rotor-position feedback circuit, the comparison circuit 1 and comparison circuit 2 are equal
It is electrically connected with logic circuit, the rotor-position feedback circuit is electrically connected with MCU, and the MCU electrically connects with logic circuit
Connect, the MCU is electrically connected with DAC module, and the DAC module is electrically connected with comparison circuit 1, the drive circuit and logic
Circuit is electrically connected with, and the logic circuit is electrically connected with LOCK lock-in circuits, and the MCU and LOCK lock-in circuits electrically connect
Connect, the LOCK lock-in circuits are electrically connected with drive circuit, and the SMPS and MCU is electrically connected with, and the SMPS and LOCK locks
Determine circuit electric connection.
Specifically, described drive circuit is IPM or discrete power drive circuit.
Specifically, described sample circuit 1 and sample circuit 2 are used for gathering drive circuit running current, for detecting motor
The operation conditions of system.
Specifically, described MCU is used for setting the output voltage of DAC module, reset enabled logic interlock circuit and resetting locking
Circuit.
Specifically, described DAC module is used for setting different comparison reference voltages to comparison circuit 1, for different compressors
Demagnetization current difference is so as to causing to protect the different demand of voltage.
Specifically, described comparison circuit 1 is used for the analog signal above sampling resistor being converted to logical signal, it compares ginseng
Voltage is examined to be set by DAC module.
Specifically, described comparison circuit 2 is used for the analog signal above sampling resistor being converted to logical signal, it compares ginseng
Examine the fixed value that voltage is hardware setting.
Specifically, described logic circuit is used for the interrelated logic letter for handling conversion comparison circuit 1, comparison circuit 2 and MCU are sent
Number.
Specifically, described LCOK lock-in circuits are used for the coherent signal for turning off MCU control drive circuits.
In summary：A kind of circuit that complete series compressor protection is realized by changing comparison voltage method provided by the invention,
As shown in figure 1, reel inside points are by adjusting DAC, including sampling resistor circuit, two-way comparison circuit, MCU, DAC module, patrol
Circuit, LOCK lock-in circuits are collected, MCU, EMI filtering, rectifying and wave-filtering DC BUS circuits, power driving circuit, DC need to be coordinated
MOTOR modules, rotor-position feedback circuit and motor are used together, applied to refrigerator, washing machine, air-conditioning and servo-drive system etc.,
Used as power plant module.As shown in Fig. 2 the current signal of motor operation is converted to voltage signal by sampling resistor circuit；Such as
Shown in Fig. 3, comparison circuit 1 is by the voltage signal of sampling resistor circuit output, the voltage letter with the DAC module output of MCU controls
Number, by LM393 comparator computings, export comparative result.As shown in figure 4, comparison circuit 2 is by the electricity of sampling resistor circuit output
Signal is pressed, LM393 comparator computings are passed through with the protection point magnitude of voltage set, exports comparative result.As shown in figure 5, logic
The output signal of comparison circuit 1 and comparison circuit 2 is carried out interrelated logic computing and processing, obtains a locking signal by circuit
To lock or turning off system.As shown in fig. 6, what LOCK lock-in circuits can export MCU according to the result of logical operation circuit
Associated control signal is shielded, method be by 1 input port of the MCU output signals Jing Guo NAND gate, under normal circumstances with
NOT gate can just produce input and output；When occurring abnormal, logical operation module output locking signal enables NAND gate circuit, makes output
For constant level.Can also be LOCK lock-in circuits by the result of logical operation by the 15V power supplies of driving power part
Cut-out, is worked on prevention system.Action is that hardware circuit operating alone is completed above, aids in, has protected not against MCU
Cheng Hou, system are in the lock state, unless MCU removes reset protective circuit or restarts system.The present invention controls DAC by MCU
Module exports and the mutually corresponding protection point of different compressors, to control interlock circuit to realize the compatibility to complete series compressor,
Also protection circuit is strengthened simultaneously, electric motor protecting is protected safety and reliability, guard time is faster.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although
The present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be right
Technical scheme described in foregoing embodiments is modified, or to which part technical characteristic carry out equivalent substitution, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., the protection of the present invention should be included in
Within the scope of.
Claims (9)
1. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method, including AC input circuit, it is special
Sign is：The AC input circuit is electrically connected with EMI filter circuit, the EMI filter circuit and rectifying and wave-filtering DC BUS electricity
Road is electrically connected with, and the rectifying and wave-filtering DC BUS circuits are electrically connected with drive circuit and SMPS respectively, the drive circuit with
DC MOTOR modules are electrically connected with, and the drive circuit and sampling resistor are electrically connected with, the sampling resistor respectively with it is more electric
Road 1, comparison circuit 2 and rotor-position feedback circuit are electrically connected with, and the comparison circuit 1 and comparison circuit 2 are and logic circuit
It is electrically connected with, the rotor-position feedback circuit is electrically connected with MCU, and the MCU is electrically connected with logic circuit, the MCU
It is electrically connected with DAC module, the DAC module is electrically connected with comparison circuit 1, and the drive circuit electrically connects with logic circuit
Connect, the logic circuit is electrically connected with LOCK lock-in circuits, and the MCU is electrically connected with LOCK lock-in circuits, the LOCK
Lock-in circuit is electrically connected with drive circuit, and the SMPS and MCU is electrically connected with, and the SMPS and LOCK lock-in circuits electrically connect
Connect.
2. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described drive circuit is IPM or discrete power drive circuit.
3. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described sample circuit 1 and sample circuit 2 are used for gathering drive circuit running current, for detecting motor
The operation conditions of system.
4. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described MCU is used for setting the output voltage of DAC module, reset enabled logic interlock circuit and resetting locking
Circuit.
5. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described DAC module is used for setting different comparison reference voltages to comparison circuit 1, for different compressors
Demagnetization current difference is so as to causing to protect the different demand of voltage.
6. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described comparison circuit 1 is used for the analog signal above sampling resistor being converted to logical signal, and it compares ginseng
Voltage is examined to be set by DAC module.
7. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described comparison circuit 2 is used for the analog signal above sampling resistor being converted to logical signal, and it compares ginseng
Examine the fixed value that voltage is hardware setting.
8. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described logic circuit is used for the interrelated logic letter for handling conversion comparison circuit 1, comparison circuit 2 and MCU are sent
Number.
9. a kind of circuit that complete series compressor protection is realized by changing comparison voltage method according to claim 1,
It is characterized in that：Described LCOK lock-in circuits are used for the coherent signal for turning off MCU control drive circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710716630.2A CN107611931A (en) | 2017-08-21 | 2017-08-21 | A kind of circuit that complete series compressor protection is realized by changing comparison voltage method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710716630.2A CN107611931A (en) | 2017-08-21 | 2017-08-21 | A kind of circuit that complete series compressor protection is realized by changing comparison voltage method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107611931A true CN107611931A (en) | 2018-01-19 |
Family
ID=61065108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710716630.2A Pending CN107611931A (en) | 2017-08-21 | 2017-08-21 | A kind of circuit that complete series compressor protection is realized by changing comparison voltage method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268144A (en) * | 2013-06-07 | 2013-08-28 | 张宁 | Power monitoring device and overcurrent protection method |
| CN204006499U (en) * | 2014-04-03 | 2014-12-10 | 杭州先途电子有限公司 | Air-conditioner controller and safety control circuit thereof |
| CN106410761A (en) * | 2016-11-15 | 2017-02-15 | 芜湖美智空调设备有限公司 | Overcurrent protection circuit, control method and air conditioner of intelligent power module |
| CN106961095A (en) * | 2017-05-12 | 2017-07-18 | 广东美的制冷设备有限公司 | Current foldback circuit and air-conditioner |
-
2017
- 2017-08-21 CN CN201710716630.2A patent/CN107611931A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103268144A (en) * | 2013-06-07 | 2013-08-28 | 张宁 | Power monitoring device and overcurrent protection method |
| CN204006499U (en) * | 2014-04-03 | 2014-12-10 | 杭州先途电子有限公司 | Air-conditioner controller and safety control circuit thereof |
| CN106410761A (en) * | 2016-11-15 | 2017-02-15 | 芜湖美智空调设备有限公司 | Overcurrent protection circuit, control method and air conditioner of intelligent power module |
| CN106961095A (en) * | 2017-05-12 | 2017-07-18 | 广东美的制冷设备有限公司 | Current foldback circuit and air-conditioner |
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Application publication date: 20180119 |
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