CN206432700U - The voltage protection circuit of refrigerant recovering brushless DC motor - Google Patents
The voltage protection circuit of refrigerant recovering brushless DC motor Download PDFInfo
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- CN206432700U CN206432700U CN201720093921.6U CN201720093921U CN206432700U CN 206432700 U CN206432700 U CN 206432700U CN 201720093921 U CN201720093921 U CN 201720093921U CN 206432700 U CN206432700 U CN 206432700U
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Abstract
The utility model discloses a kind of voltage protection circuit of refrigerant recovering brushless DC motor, it includes rectification module, thermistor, filter capacitor, relay isolation control module, division module and MCU；The input connection civil power of rectification module, negative pole of output end ground connection, output head anode connects filter capacitor positive pole, filter capacitor negative pole ground connection by thermistor；The coil connection MCU of the relay of relay isolation control module, the contact of relay and thermistor are in parallel；MCU connects rectification module by division module；The positive pole of filter capacitor is connected to the power input of DC brushless motor.When finding that voltage exceedes or during less than normal range (NR), relay in MCU control relays isolation control module is disconnected, and voltage is added on thermistor, and resistance is raised after thermistor heating, the power supply circuit of DC brushless motor is approximately disconnected, prevent the situation of motor damage.The utility model is applied to the equipment such as coolant reclaiming machine.
Description
Technical field
The utility model is related to coolant reclaiming machine control field, more particularly, to a kind of coolant reclaiming machine brush DC electricity
The voltage protection circuit of machine.
Background technology
Coolant reclaiming machine is a kind of equipment for reclaiming refrigerant, for reclaiming refrigerating machine（Civilian, business air conditioner, refrigerator,
The refrigeration machines such as source pump, screw rod centrifugal chiller）In refrigerant.Carry out certain processing while recovery to refrigerant again,
Such as drying, the filtering of impurity, oil, in order to the secondary utilization of refrigerant, are widely used in family expenses, Centralized Air-conditioning in Public Buildings, system
Cold manufacturer and after-sale service.
The recycling machine being used as power using brshless DC motor, when electric voltage exception in wrong plug power supply or the course of work, can lead
Motor driver is caused to burn immediately.
The content of the invention
The utility model, which is mainly, to be solved to lack energy situations such as to wrong plug power supply or electric voltage exception present in prior art
Enough providing the technical problem of the hardware circuit effectively protected, there is provided a kind of voltage protection of refrigerant recovering brushless DC motor
Circuit.
The utility model is mainly what is be addressed by following technical proposals for above-mentioned technical problem：A kind of refrigerant is returned
Receive brushless DC motor voltage protection circuit, including rectification module, thermistor PR, filter capacitor C6, relay every
From control module, division module and MCU；The input connection civil power of the rectification module, negative pole of output end ground connection, output is rectified
Pole connects thermistor PR first ends；The ends of thermistor PR second connect filter capacitor C6 positive poles, filter capacitor C6 negative poles ground connection；
Relay isolation control module includes relay, and the coil of relay connects MCU, and the contact of relay and thermistor PR are simultaneously
Connection；The first end of division module connects the output head anode of rectification module, the second end ground connection, partial pressure output end connection MCU；Filtering
Electric capacity C6 positive pole is connected to the power input of DC brushless motor.
MCU detects the output voltage of rectification module by division module, under normal circumstances MCU control relays isolation control
Civil power is converted into after direct current after filtering that capacitor filtering is directly output to direct current by the relay adhesive in module, rectification module
Brushless electric machine.When finding that voltage exceedes or during less than normal range (NR), the relay in MCU control relays isolation control module
Disconnect, voltage is added on thermistor, resistance is raised after thermistor heating, the power supply circuit of DC brushless motor is approximately broken
Open, prevent the situation of motor damage.
Preferably, the relay isolation control module also includes triode Q1, resistance R8, resistance R9 and optocoupler U2；
Optocoupler U2 input anode passes through electricity by resistance R9 connection power supply VCC5V, input cathode connection MCU, output head anode
Hinder R8 connection power supply 12V, negative pole of output end connecting triode Q1 base stage；Triode Q1 grounded emitter, colelctor electrode connection
The end of relay coil second；The coil first end connection power supply 12V of relay；The of relay movable contact connection thermistor PR
One end, relay stationary contact connection thermistor PR the second end.
Optocoupler is isolated to the MCU control signals exported.Q1 changes cut-off or conducting state according to the output of optocoupler, cuts
No current in relay coil when only, contact disconnects；Electric current, the closing of contact are produced during conducting in relay coil.
Preferably, the division module includes resistance R21, resistance R27, resistance R31 and resistance R35, the resistance R21
First end connect rectification module output head anode, resistance R21 the second end passes through the first of resistance R27 connection resistance R31
End, resistance R31 the second end is grounded by resistance R35, and resistance R31 the second end is connected as the partial pressure output end of division module
MCU 1 pin.
The output voltage of rectification module is input in MCU by partial pressure in proportion.
Preferably, the rectification module is bridge rectifier.
AC conversion is direct current electricity output by bridge rectifier.
Preferably, the MCU is STM8S903.
The beneficial effect that the utility model is brought has been to provide a kind of protection circuit, breaks in input voltage abnormal conditions
Open relay, allows the heating of thermistor pressure-bearing to rise resistance, reduces the voltage of DC brushless motor, prevent burn-down of electric motor, protect well
Electric machine control system is protected.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of the present utility model.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：The voltage protection circuit of a kind of refrigerant recovering brushless DC motor of the present embodiment, such as Fig. 1 institutes
Show, including rectification module, thermistor PR, filter capacitor C6, relay isolation control module, division module and MCU；It is described whole
The input connection civil power of flow module, negative pole of output end ground connection, output head anode connection thermistor PR first ends；Thermistor
The ends of PR second connect filter capacitor C6 positive poles, filter capacitor C6 negative poles ground connection；Relay isolation control module includes relay, after
Coil the connection MCU, the contact of relay and thermistor PR of electrical equipment are in parallel；The first end connection rectification module of division module
Output head anode, the second end ground connection, partial pressure output end connection MCU；Filter capacitor C6 positive pole is connected to DC brushless motor
Power input.
Relay isolation control module also includes triode Q1, resistance R8, resistance R9 and optocoupler U2；Optocoupler U2 input
Positive pole passes through resistance R8 connection power supplys by resistance R9 connection power supply VCC5V, input cathode connection MCU, output head anode
12V, negative pole of output end connecting triode Q1 base stage；Triode Q1 grounded emitter, collector connection relay coil
Two ends；The coil first end connection power supply 12V of relay；Relay movable contact connection thermistor PR first end, relay
Stationary contact connection thermistor PR the second end.
Optocoupler is isolated to the MCU control signals exported.Q1 changes cut-off or conducting state according to the output of optocoupler, cuts
No current in relay coil when only, contact disconnects；Electric current, the closing of contact are produced during conducting in relay coil.
Division module includes resistance R21, resistance R27, resistance R31 and resistance R35, the resistance R21 first end connection
The output head anode of rectification module, resistance R21 the second end by resistance R27 connection resistance R31 first end, resistance R31's
Second end is grounded by resistance R35, and resistance R31 the second end connects MCU 1 pin as the partial pressure output end of division module.
The output voltage of rectification module is input in MCU by partial pressure in proportion.
Rectification module is bridge rectifier.AC conversion is direct current electricity output by bridge rectifier.
The MCU is STM8S903.
When the 220V etc. that is inserted into of 110V or 100V electric machine control system mistake is higher than the power supply that rated voltage uses scope
On, or 220V electric machine control system mistake be inserted into 110V or 100V etc. less than rated voltage using scope power supply on
When, MCU detects voltage not in normal range (NR), and relay not adhesive, filter capacitor is powered by thermistor, protects filtered electrical
Hold, even if pressing power on button, MCU does not export PWM ripples yet, and motor does not start, so as to protection motor control system well
System, is unlikely to damage；
When motor is run in normal voltage range originally, emergency case causes supply voltage exception or artificial origin
Maloperation Switching power voltage, MCU detects voltage and does not disconnect relay immediately in normal range (NR), and filter capacitor is by thermistor
Power supply, protects filter capacitor, while stopping the output of PWM ripples, stops motor operation, so as to protection motor control system well
System, is unlikely to damage.
Specific embodiment described herein is only to the invention spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from principle of the present utility model or surmount scope defined in appended claims.
Although more having used the terms such as thermistor, relay, MCU herein, it is not precluded from using other terms
Possibility.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；They are explained
All disagreed into the additional limitation of any one with the invention spirit.
Claims (5)
1. a kind of voltage protection circuit of refrigerant recovering brushless DC motor, it is characterised in that including rectification module, temperature-sensitive
Resistance PR, filter capacitor C6, relay isolation control module, division module and MCU；The input connection city of the rectification module
Electricity, negative pole of output end ground connection, output head anode connection thermistor PR first ends；The ends of thermistor PR second connect filter capacitor
C6 positive poles, filter capacitor C6 negative poles ground connection；Relay isolation control module includes relay, and the coil of relay connects MCU, after
The contact of electrical equipment and thermistor PR are in parallel；The first end of division module connects the output head anode of rectification module, the second termination
Ground, partial pressure output end connection MCU；Filter capacitor C6 positive pole is connected to the power input of DC brushless motor.
2. the voltage protection circuit of refrigerant recovering brushless DC motor according to claim 1, it is characterised in that institute
Stating relay isolation control module also includes triode Q1, resistance R8, resistance R9 and optocoupler U2；Optocoupler U2 input anode is led to
Resistance R9 connection power supply VCC5V are crossed, input cathode connection MCU, output head anode passes through resistance R8 connection power supply 12V, output
Hold negative pole connecting triode Q1 base stage；Triode Q1 grounded emitter, the end of collector connection relay coil second；Relay
The coil first end connection power supply 12V of device；Relay movable contact connection thermistor PR first end, the connection of relay stationary contact
Thermistor PR the second end.
3. the voltage protection circuit of refrigerant recovering brushless DC motor according to claim 1 or 2, its feature exists
In the first end connection that the division module includes resistance R21, resistance R27, resistance R31 and resistance R35, the resistance R21 is whole
The output head anode of flow module, resistance R21 the second end passes through resistance R27 connection resistance R31 first end, the of resistance R31
Two ends are grounded by resistance R35, and resistance R31 the second end connects MCU 1 pin as the partial pressure output end of division module.
4. the voltage protection circuit of refrigerant recovering brushless DC motor according to claim 1 or 2, its feature exists
In the rectification module is bridge rectifier.
5. the voltage protection circuit of refrigerant recovering brushless DC motor according to claim 3, it is characterised in that institute
MCU is stated for STM8S903.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093921.6U CN206432700U (en) | 2017-01-24 | 2017-01-24 | The voltage protection circuit of refrigerant recovering brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093921.6U CN206432700U (en) | 2017-01-24 | 2017-01-24 | The voltage protection circuit of refrigerant recovering brushless DC motor |
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| Publication Number | Publication Date |
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| CN206432700U true CN206432700U (en) | 2017-08-22 |
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| CN201720093921.6U Active CN206432700U (en) | 2017-01-24 | 2017-01-24 | The voltage protection circuit of refrigerant recovering brushless DC motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681626A (en) * | 2017-09-13 | 2018-02-09 | 广东美的制冷设备有限公司 | The protection circuit and its control method of air-conditioner controller |
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
| CN108832608A (en) * | 2018-08-09 | 2018-11-16 | 浙江泰福泵业股份有限公司 | A kind of peak voltage protection circuit |
| CN113114022A (en) * | 2021-04-07 | 2021-07-13 | 珠海拓芯科技有限公司 | Resistance control module, power output circuit and air conditioner |
-
2017
- 2017-01-24 CN CN201720093921.6U patent/CN206432700U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681626A (en) * | 2017-09-13 | 2018-02-09 | 广东美的制冷设备有限公司 | The protection circuit and its control method of air-conditioner controller |
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
| CN107732873B (en) * | 2017-11-09 | 2024-03-22 | 厦门芯阳科技股份有限公司 | Protection circuit and method for preventing BLDC motor from being driven to run to generate power |
| CN108832608A (en) * | 2018-08-09 | 2018-11-16 | 浙江泰福泵业股份有限公司 | A kind of peak voltage protection circuit |
| CN113114022A (en) * | 2021-04-07 | 2021-07-13 | 珠海拓芯科技有限公司 | Resistance control module, power output circuit and air conditioner |
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