CN208316296U - A kind of excess voltage protection and compressor with the circuit and air conditioner - Google Patents
A kind of excess voltage protection and compressor with the circuit and air conditioner Download PDFInfo
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- CN208316296U CN208316296U CN201821080435.1U CN201821080435U CN208316296U CN 208316296 U CN208316296 U CN 208316296U CN 201821080435 U CN201821080435 U CN 201821080435U CN 208316296 U CN208316296 U CN 208316296U
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- shorting switch
- voltage protection
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Abstract
The utility model discloses a kind of excess voltage protections; driving circuit and over-voltage control module and shorting switch with driving motor rotation; voltage in over-voltage control module detection driving circuit on direct current transportation bus, the connection that shorting switch is controlled when the voltage detected is more than threshold voltage, shorting switch are connected between two phase lines of power supply of the motor to fall extra energy consumption；The invention also discloses and with the protection circuit compressor and air conditioner；When the utility model solves air-conditioning defrost or oil return; compressor is in generating state energy and recoils back driving plate; lead to the problem of damaging route and frequency conversion; the safety problem for eliminating the energy loss of bus braking circuit and powering off suddenly; when compressor is in the recoil of generating state energy; driving plate is unaffected; system will not report the excessively high protection of busbar voltage; the use of the control circuit of less power consumption resistance, switch control pipe and indispensability; program is without increasing corresponding control; keep protection sensitiveer, reliability is higher.
Description
Technical field
The utility model relates to electrical apparatus control circuit more particularly to a kind of because motor is in generating state, energy recoils
The circuit and compressor with the circuit and air conditioner of overvoltage protection from when returning driving plate.
Background technique
With the development of Electrical Control Technology, frequency converter is more and more widely used air-conditioning system, but frequency converter overvoltage
And technical staff the problem of paying close attention to always.At present applied to air-conditioning system frequency converter the problem is that, air-conditioning defrost or
When oil return, because four-way valve commutates, high-low pressure will appear phenomenon of playing a reversed role, and system pressure actively pushes compressor to run, and compressor becomes
For generating state, energy recoils back driving plate, leads to overvoltage protection.Typical hardware solution is to increase bus brake electricity
Road consumes extra energy by brake resistor when busbar voltage is excessively high.But this method at least needs to increase power consumption resistance, switch control
Tubulation and indispensable control circuit also need to increase corresponding control in program, and if driving plate powers off suddenly when defrost, can not yet
Control the access of braking circuit.
Therefore, a kind of circuit for preventing motor overvoltage protection how is designed, brake resistor is not used, without increasing phase
The control program answered keeps protection sensitiveer, this is industry technical problem urgently to be resolved.
Utility model content
In order to solve the defect that the prior art needs to increase brake resistor, propose that one kind does not use brake resistor, without increasing
Add the corresponding excess voltage protection for controlling program and compressor with the circuit and air conditioner.
The technical solution adopted in the utility model is to design a kind of excess voltage protection, with driving motor rotation
Driving circuit and over-voltage control module and shorting switch, it is female that the over-voltage control module detects direct current transportation in driving circuit
Voltage on line, the on-off for whether being more than threshold voltage according to the voltage detected and controlling shorting switch, shorting switch connection
Between two phase lines of power supply of the motor.When detecting the overtension on direct current transportation bus, it is shorted power supply two
Phase line falls extra energy consumption.
The driving circuit includes the rectifier bridge being sequentially connected in series between AC power source and the motor, the direct current transportation
Bus and inverter.
The over-voltage control module includes sequentially connected comparison module and drive module and to the straight of each module for power supply
Galvanic electricity source, the voltage and the threshold voltage that the input terminal of the comparison module connects the direct current transportation bus, will test
It relatively and by comparison result is conveyed to the drive module, the drive module zoom comparison result drives the short circuit to open in turn
Put row on-off action into.
The comparison module has a comparator, and the homophase input of the comparator terminates that the direct current transportation bus, it is anti-
Phase input terminal connects the threshold voltage by comparing resistance, its output end exports the comparison result.
The drive module has triode, and the base stage of the triode connects the defeated of the comparator by first resistor
Outlet, its emitter, which are grounded and pass through second resistance, connects the output end of the comparator, its collector connection first diode
Anode and connect the control terminal of the shorting switch, the cathode of the first diode connects the anode of the DC power supply.
The shorting switch use relay, control terminal be relay coil one end, the relay coil it is another
The anode of the one termination DC power supply, the normally opened contact of relay are serially connected between two phase lines of the motor power.
Bus capacitor is connected between the positive and negative bus of the direct current transportation bus.
A kind of compressor has also been devised in the utility model comprising motor, the motor have overvoltage protection electricity above-mentioned
Road.
A kind of air-conditioning system has also been devised in the utility model comprising compressor, the motor in the compressor have aforementioned
Excess voltage protection.
Compared with prior art, when the utility model solves air-conditioning defrost or oil return, compressor is in generating state energy
The driving plate that recoils back is measured, the problem of damaging route and frequency conversion is caused, eliminate the energy loss of bus braking circuit and is broken suddenly
The safety problem of electricity, when compressor is in the recoil of generating state energy, driving plate is unaffected, and system will not report bus
Overtension protection, the use of the control circuit of less power consumption resistance, switch control pipe and indispensability, program are corresponding without increasing
Control keeps protection sensitiveer, and reliability is higher.
Detailed description of the invention
The utility model is described in detail below with reference to embodiment and attached drawing, in which:
Fig. 1 is preferred embodiment functional block diagram；
Fig. 2 is preferred embodiment circuit diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is described in further detail the utility model.It should be appreciated that specific embodiment described herein is used only for explaining this
Utility model is not used to limit the utility model.
The utility model discloses a kind of excess voltage protection, when there is overtension or driving power-off motor is in hair
When electricity condition, it is shorted the wherein two-phase of motor, by the excess voltage protection of extra energy consumption on the compressor.Referring to figure
Preferred embodiment functional block diagram shown in 1, excess voltage protection have the driving circuit and excessively voltage-controlled of driving motor rotation
Molding block and shorting switch, voltage in over-voltage control module detection driving circuit on direct current transportation bus, according to detection
To voltage whether be more than threshold voltage Vref and control the on-off of shorting switch, shorting switch is connected to the power supply of the motor
Between two phase lines.Shorting switch is usually in an off state, in favor of motor normal work, when motor operation irregularity such as
When air-conditioning defrost or oil return, because four-way valve commutates, high-low pressure will appear phenomenon of playing a reversed role, and system pressure actively pushes compressor to transport
Row, compressor become generating state, and energy recoils back driving plate, and over-voltage control module detects the voltage on direct current transportation bus
More than threshold voltage Vref, and then shorting switch closure is controlled, be shorted motor wherein two-phase, by extra energy consumption, to protect
Protect driving plate.
Combined with Figure 1 and Figure 2, in the preferred embodiment, the driving circuit includes being sequentially connected in series in AC power source and described
Rectifier bridge, the direct current transportation bus and inverter between motor.The over-voltage control module includes sequentially connected ratio
Compared with module and drive module and to the DC power supply of each module for power supply, the input terminal of the comparison module connects the direct current
Transmission of electricity bus, the voltage that will test are conveyed to the drive module compared with the threshold voltage Vref and by comparison result,
The drive module zoom comparison result drives the shorting switch to carry out on-off action in turn.
Referring to Fig. 2 shows preferred embodiment, the comparison module have comparator, the non-inverting input terminal of the comparator
Connecing the direct current transportation bus, its inverting input terminal, by comparing resistance Rref to connect the threshold voltage Vref, its output end defeated
The comparison result out.The drive module has triode (NPN type), and the base stage of the triode is connected by first resistor R1
The output end of the comparator is connect, its emitter is grounded and passes through second resistance R2 and connects the output end of the comparator, Qi Ji
The anode of electrode connection first diode D1 and the control terminal for connecting the shorting switch, the cathode connection of the first diode
The anode of the DC power supply.The shorting switch uses relay, and control terminal is one end of relay coil, the relay
The anode of another termination DC power supply of device coil, the normally opened contact of relay are serially connected in two phase lines of the motor power
Between.Bus capacitor is connected between the positive and negative bus of the direct current transportation bus.
In conjunction with Fig. 2 be described in detail working principle of the utility model is:
1. operate normally: Vref is threshold voltage, and U is the direct current transportation busbar voltage detected, when normal operation
Vref > U, comparator output valve is negative at this time, and rear class triode is in not on-state, and relay K is in an off state
System operates normally；
2. energy recoils: when compressor is in generating state, direct current transportation busbar voltage U value can be made to increase, work as U
When > Vref, comparator output valve is positive, and can make rear class triode ON, movement is closed by relay device K, at this time by compressor
Two-phase be shorted, energy will be unable to flow back into bus, and directly on the compressor, busbar voltage will recovery normal voltage shape for consumption
State reaches protective effect.
The invention also discloses a kind of compressors comprising motor, the motor have overvoltage protection electricity above-mentioned
Road.
The invention also discloses a kind of air-conditioning systems comprising compressor, the motor in the compressor have aforementioned
Excess voltage protection.
Above embodiments are by way of example only, non-to provide constraints.It is any without departing from the application spirit and scope, and to it
The equivalent modifications or change of progress, shall be included in the scope of claims of this application.
Claims (9)
1. a kind of excess voltage protection, the driving circuit with driving motor rotation, it is characterised in that: further include over-voltage control
Module and shorting switch, voltage in over-voltage control module detection driving circuit on direct current transportation bus, according to detecting
Voltage whether be more than threshold voltage and control the on-off of shorting switch, shorting switch is connected to two phases of power supply of the motor
Between line.
2. excess voltage protection as described in claim 1, it is characterised in that: the driving circuit includes being sequentially connected in series handing over
Rectifier bridge, the direct current transportation bus and inverter between galvanic electricity source and the motor.
3. excess voltage protection as claimed in claim 2, it is characterised in that: the over-voltage control module includes being sequentially connected
Comparison module and drive module and the DC power supply to each module for power supply, described in the input terminal connection of the comparison module
Direct current transportation bus, the voltage that will test are conveyed to the drive module compared with the threshold voltage and by comparison result,
The drive module zoom comparison result drives the shorting switch to carry out on-off action in turn.
4. excess voltage protection as claimed in claim 3, it is characterised in that: the comparison module has comparator, described
The homophase input of comparator terminate the direct current transportation bus, its inverting input terminal by comparing resistance connect the threshold voltage,
Its output end exports the comparison result.
5. excess voltage protection as claimed in claim 4, it is characterised in that: the drive module has triode, described
The base stage of triode connects the output end of the comparator by first resistor, its emitter is grounded and is connected by second resistance
The output end of the comparator, its collector connect the anode of first diode and connect the control terminal of the shorting switch, institute
The cathode for stating first diode connects the anode of the DC power supply.
6. excess voltage protection as claimed in claim 5, it is characterised in that: the shorting switch uses relay, control
End processed be relay coil one end, the anode of another termination DC power supply of the relay coil, relay it is normal
Contact is opened to be serially connected between two phase lines of the motor power.
7. excess voltage protection as claimed in claim 6, it is characterised in that: the positive and negative bus of the direct current transportation bus
Between connect bus capacitor.
8. a kind of compressor, including motor, it is characterised in that: the motor has claim 1 to 7 described in any item excessively electric
Voltage protection circuit.
9. a kind of air conditioner, including compressor, it is characterised in that: the motor in the compressor has claim 1 to 7 any
Excess voltage protection described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821080435.1U CN208316296U (en) | 2018-07-09 | 2018-07-09 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821080435.1U CN208316296U (en) | 2018-07-09 | 2018-07-09 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208316296U true CN208316296U (en) | 2019-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821080435.1U Active CN208316296U (en) | 2018-07-09 | 2018-07-09 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
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| CN (1) | CN208316296U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599128A (en) * | 2018-07-09 | 2018-09-28 | 珠海格力电器股份有限公司 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
-
2018
- 2018-07-09 CN CN201821080435.1U patent/CN208316296U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599128A (en) * | 2018-07-09 | 2018-09-28 | 珠海格力电器股份有限公司 | A kind of excess voltage protection and compressor with the circuit and air conditioner |
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