CN208797860U - A kind of electroless frequency conversion braking circuit of three-phase and air conditioner - Google Patents
A kind of electroless frequency conversion braking circuit of three-phase and air conditioner Download PDFInfo
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- CN208797860U CN208797860U CN201821712342.6U CN201821712342U CN208797860U CN 208797860 U CN208797860 U CN 208797860U CN 201821712342 U CN201821712342 U CN 201821712342U CN 208797860 U CN208797860 U CN 208797860U
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Abstract
The utility model provides a kind of electroless frequency conversion braking circuit of three-phase and air conditioner, the electroless frequency conversion braking circuit of three-phase includes the electroless frequency changer circuit of three-phase, brake control signal generation circuit, brake driving circuit and brake control circuit, the DC bus-bar voltage anode of the electroless frequency changer circuit of three-phase is connected with the input terminal of the brake control signal generation circuit, the output end of the brake control signal generation circuit is connected with the input terminal of the brake driving circuit, the output end of the brake driving circuit is connected with the brake control circuit, the brake control circuit is connected with the electroless frequency changer circuit of the three-phase.The structure of the electroless frequency conversion braking circuit of three-phase described in the utility model is simple, can under the DC bus-bar voltage rapid fluctuation of the electroless frequency changer circuit of three-phase effective protection power device.
Description
Technical field
The utility model relates to control circuit technical field, in particular to the electroless frequency conversion braking circuit of a kind of three-phase and sky
Adjust device.
Background technique
In the electroless frequency changer circuit of the three-phase of air-conditioning driver, the small thin-film capacitor effect in DC bus side mainly absorbs
Because of the higher hamonic wave of DC bus-bar voltage caused by PWM inverter.It is protected suddenly during compressor of air conditioner runs at high speed
When shield property is shut down, the thin-film capacitor reverse charging that the self induction voltage that compressor coil generates can be small to DC bus side, and therefore
Thin-film capacitor capacitance is smaller, can not effectively absorb self induction voltage, it is easy to lead to the sharply raising of DC bus-bar voltage, and then damage
Consume power device.
Utility model content
In view of this, the utility model is directed to a kind of electroless frequency conversion braking circuit of three-phase, with electroless in three-phase
Effective protection power device when the DC bus-bar voltage of frequency changer circuit sharply increases.
In order to achieve the above objectives, the technical solution of the utility model is achieved in that
A kind of electroless frequency conversion braking circuit of three-phase, including the electroless frequency changer circuit of three-phase, brake control signal generate electricity
Road, brake driving circuit and brake control circuit, wherein
The DC bus-bar voltage anode of the electroless frequency changer circuit of three-phase and the brake control signal generation circuit
Input terminal is connected, and the output end of the brake control signal generation circuit is connected with the input terminal of the brake driving circuit, institute
Brake control signal generation circuit is stated to acquire the DC bus-bar voltage of the electroless frequency changer circuit of the three-phase and export a control letter
Number to the brake driving circuit；
The output end of the brake driving circuit is connected with the brake control circuit, and the brake driving circuit is according to institute
The control signal for stating the output of brake control signal generation circuit exports corresponding driving signal to the brake control circuit；
The brake control circuit is connected with the electroless frequency changer circuit of the three-phase, and the brake control circuit is according to
The positive and negative of the DC bus of the electroless frequency changer circuit of the three-phase is connected in the driving signal of brake driving circuit output
It simultaneously discharges DC bus-bar voltage pole.
Further, the brake control circuit includes switching tube and first resistor, and the collector of the switching tube is through institute
First resistor is stated to be connected with the DC bus anode of the electroless frequency changer circuit of the three-phase, the emitter of the switching tube with it is described
The DC bus cathode of the electroless frequency changer circuit of three-phase is connected, the output of the grid of the switching tube and the brake driving circuit
End is connected.
Further, the brake control circuit further includes diode, the anode of the diode and the switching tube
Collector is connected, and the cathode of the diode is connected with the DC bus anode of the electroless frequency changer circuit of the three-phase.
Further, the brake driving circuit includes driver, the 8th resistance, the 9th resistance and the tenth resistance, institute
The output end of brake control signal generation circuit is stated successively through the 8th resistance, the 9th resistance eutral grounding, the driver
IN+ pin be connected with the common end of the 8th resistance and the 9th resistance；The IN- pin of the driver is grounded；Institute
The OUT pin for stating driver is connected through the tenth resistance with the grid of the switching tube.
Further, the brake driving circuit further includes the second capacitor, and the IN+ pin connects through second capacitor
Ground.
Further, the brake driving circuit further includes third capacitor and the 4th capacitor, and the VCC1 of the driver draws
Foot is through the third capacity earth, and the VCC2 pin of the driver is through the 4th capacity earth.
Further, the brake control signal generation circuit includes comparator, second resistance, 3rd resistor, the 4th electricity
Resistance and the 5th resistance, the DC bus-bar voltage anode of the electroless frequency changer circuit of three-phase by after divider resistance sampling through institute
Second resistance is stated to be connected with the noninverting input of the comparator；Reference voltage source is successively through the 3rd resistor, the described 4th
Resistance eutral grounding, the reverse input end of the comparator are connected with the common end of the 3rd resistor and the 4th resistance；It is described
The output end of comparator is divided into two-way, is connected all the way through the 5th resistance with DC power supply, and another way and the brake drive
The input terminal of circuit is connected.
Further, the brake control signal generation circuit further includes the 6th resistance, one end of the 6th resistance with
The output end of the comparator is connected, and the other end is connected with the noninverting input of the comparator.
Further, the brake control signal generation circuit further includes the 7th resistance and first capacitor, the comparator
Output end be successively grounded through the 7th resistance, the first capacitor, the input terminal and described the of the brake driving circuit
Seven resistance are connected with the common end of the first capacitor.
Compared with the existing technology, the electroless frequency conversion braking circuit of three-phase described in the utility model has the advantage that
In the electroless frequency conversion braking circuit of three-phase described in the utility model, when the direct current of the electroless frequency changer circuit of three-phase is female
When line voltage is sharply increased because of the self induction voltage of compressor coil, brake control signal generation circuit can export a control signal control
System brake driving circuit exports a driving signal, and brake control circuit is according to driving signal to the straight of the electroless frequency changer circuit of three-phase
Stream busbar voltage is discharged, and power device can be effectively protected.
The another object of the utility model is to provide a kind of air conditioner, in the direct current of the electroless frequency changer circuit of three-phase mother
Effective protection power device when line voltage sharply increases.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of air conditioner, including the electroless frequency conversion braking circuit of any of the above-described three-phase.
Possessed advantage is similar compared with the existing technology with the electroless frequency conversion braking circuit of above-mentioned three-phase for the air conditioner,
Details are not described herein.
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 schematic diagram of the electroless frequency conversion braking circuit of three-phase described in the utility model embodiment；
Fig. 2 is the circuit diagram of the electroless frequency changer circuit of three-phase described in the utility model embodiment；
Fig. 3 is the circuit of brake control signal generation circuit described in the utility model embodiment and brake driving circuit
Figure.
Description of symbols:
The electroless frequency changer circuit of 10- three-phase, 101- rectifier, 102- inverter, 103- thin-film capacitor, 20- brake control
Signal generating circuit, 30- brake driving circuit, 40- brake control circuit, R1- first resistor, R2- second resistance, R3- third
Resistance, the 4th resistance of R4-, the 5th resistance of R5-, the 6th resistance of R6-, the 7th resistance of R7-, the 8th resistance of R8-, the 9th resistance of R9-,
The tenth resistance of R10-, C1- first capacitor, the second capacitor of C2-, C3- third capacitor, the 4th capacitor of C4-, U1- comparator, IC1- drive
Dynamic device, S1- switching tube.
Specific embodiment
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment 1
As shown in Figure 1, its circuit diagram for the electroless frequency conversion braking circuit of three-phase in the present embodiment；Wherein, the three-phase
Electroless frequency conversion braking circuit includes the electroless frequency changer circuit 10 of three-phase, brake control signal generation circuit 20, brake driving electricity
Road 30 and brake control circuit 40.
The DC bus-bar voltage anode and the brake control signal generation circuit of the electroless frequency changer circuit 10 of three-phase
20 input terminal is connected, the input terminal of the output end of the brake control signal generation circuit 20 and the brake driving circuit 30
It is connected, the brake control signal generation circuit 20 acquires the DC bus-bar voltage of the electroless frequency changer circuit 10 of the three-phase and defeated
Out one signal is controlled to the brake driving circuit 30；
The output end of the brake driving circuit 30 is connected with the brake control circuit 40, the brake driving circuit 30
Corresponding driving signal is exported to the brake according to the control signal of the brake control signal generation circuit 20 output
Control circuit 40；
The brake control circuit 40 is connected with the electroless frequency changer circuit 10 of the three-phase, the brake control circuit 40
The DC bus of the electroless frequency changer circuit 10 of the three-phase is connected according to the driving signal that the brake driving circuit 30 exports
Anode and cathode and discharge DC bus-bar voltage.
Specifically, as shown in Fig. 2, the electroless frequency changer circuit 10 of three-phase includes rectifier 101, inverter 102 and film
Capacitor 103, the coil meeting when the compressor of air conditioner protectiveness shutdown occurs during running at high speed suddenly, in compressor
Self induction voltage is generated, self induction voltage is to 103 reverse charging of thin-film capacitor, because the capacitance of thin-film capacitor 103 is smaller, it is easy to lead
It causes the DC bus-bar voltage of inverter sharply to increase, and then damages the power device in the electroless frequency changer circuit 10 of three-phase.This reality
It applies in example, when DC bus-bar voltage sharply increases, brake control signal generation circuit 20 samples DC bus-bar voltage,
And according to one control signal of sampled voltage output to brake driving circuit 30, brake driving circuit 30 is defeated according to the control signal
For corresponding driving signal to brake control circuit 40, brake control circuit 40 is electroless according to driving signal conducting three-phase out
The anode and cathode of the DC bus of frequency changer circuit 10 simultaneously discharge to DC bus-bar voltage.
In this way, DC bus of the electroless frequency conversion braking circuit of three-phase in the electroless frequency changer circuit 10 of three-phase in the present embodiment
When voltage sharply increases, the power device in the electroless frequency changer circuit 10 of three-phase, and the electroless frequency conversion of three-phase can be effectively protected
The structure of braking circuit is simple, cost is relatively low.
Further, rectifier 101 includes 6 rectifier diodes, the input terminal and three-phase of rectifier 101 in the present embodiment
AC power source is connected, and the output end of rectifier 101 is connected with the input terminal of inverter 102, brake control circuit 40 respectively, inversion
Device includes 6 field-effect tube, and the output end of inverter 102 is connected to the motor.
Embodiment 2
The electroless frequency conversion braking circuit of three-phase as described above, the present embodiment is different from place and is, in conjunction with Fig. 2 institute
Show, the brake control circuit 40 includes switching tube S1 and first resistor R1, and the collector of the switching tube S1 is through described first
Resistance R1 is connected with the DC bus anode of the electroless frequency changer circuit 10 of the three-phase, the emitter of the switching tube S1 with it is described
The DC bus cathode of the electroless frequency changer circuit 10 of three-phase is connected, the grid of the switching tube S1 and the brake driving circuit 30
Output end be connected.
Specifically, the preferred switching tube S1 of the present embodiment is insulated gate bipolar transistor IGBT (Insulated Gate
Bipolar Transistor).When the DC bus-bar voltage of the electroless frequency changer circuit 10 of three-phase sharply increases, brake driving electricity
The control signal that road 30 is exported according to brake control signal generation circuit 20 exports the driving signal of a high level to switching tube S1
Grid, switching tube S1 conducting, motor, first resistor R1, is formed into a loop between switching tube S1 inverter, to DC bus electricity
Pressure is discharged.
In this way, brake control circuit 40 can be in the DC bus-bar voltage urgency of the electroless frequency changer circuit 10 of three-phase in the present embodiment
Play discharges to DC bus-bar voltage when increasing, and the power device of the electroless frequency changer circuit 10 of three-phase is avoided to be burnt by peak voltage
It ruins, effectively protects power device.
Further, brake control circuit 40 described in the present embodiment further includes diode, the anode of the diode with
The collector of the switching tube S1 is connected, the DC bus of the cathode of the diode and the electroless frequency changer circuit 10 of the three-phase
Anode is connected.Collector may generate biggish electric current to switching tube S1 when off, and diode can be excessively high in collector potential
When make the fast quick-recovery of collector potential.
Further, the preferred first resistor R1 of the present embodiment is the biggish cement resistor of power, is allowed through biggish electricity
Stream can control DC bus-bar voltage in scope of design.
Further, discharge current can be calculated according to discharge voltage in the present embodiment, discharge current is controlled in safe model
It encloses, it is ensured that switching tube S1 is not damaged.
Embodiment 3
The electroless frequency conversion braking circuit of three-phase as described above, the present embodiment is different from place and is, in conjunction with Fig. 2 institute
Show, the brake control signal generation circuit 20 include comparator U1, second resistance R2,3rd resistor R3, the 4th resistance R4 with
And the 5th resistance R5, the DC bus-bar voltage anode of the electroless frequency changer circuit 10 of three-phase sampled by divider resistance after through institute
Second resistance R2 is stated to be connected with the noninverting input of the comparator U1；Reference voltage source is successively through the 3rd resistor R3, institute
State the 4th resistance R4 ground connection, the public affairs of the reverse input end of the comparator U1 and the 3rd resistor R3 and the 4th resistance R4
End is connected altogether；The output end of the comparator U1 is divided into two-way, is connected all the way through the 5th resistance R5 with DC power supply, another
Road is connected with the input terminal of the brake driving circuit 30.
Specifically, the voltage value of reference voltage source is the crest voltage of DC bus operation, DC bus is run into peak value
Voltage is as reference voltage, the inverting input terminal of input comparator U1 after 3rd resistor R3 and the 4th resistance R4 partial pressure, in real time
Non-inverting input terminal through second resistance R2 input comparator U1 after the DC bus-bar voltage of acquisition is sampled by divider resistance, compares
Collected voltage is compared by device U1 with reference voltage, and when collected voltage is higher than reference voltage, comparator U1 is defeated
High level signal out, it is on the contrary then export low level signal.When the DC bus-bar voltage of the electroless frequency changer circuit 10 of three-phase sharply rises
Gao Shi, if collected DC bus-bar voltage is higher than reference voltage, comparator U1 exports high level signal, and brake driving circuit 30
According to the high level signal, the driving signal of a high level is exported to the grid of switching tube S1.Wherein, second resistance R2 is limited
Leakage resistance avoids sample rate current is excessively high from burning comparator U1.
In this way, the brake control signal generation circuit 20 in the present embodiment can be in the direct current of the electroless frequency changer circuit 10 of three-phase
The control signal of a high level is exported when busbar voltage sharply increases to brake driving circuit 30, the driving circuit 30 that brakes is according to institute
High level signal is stated, exports the driving signal of a high level to the grid of switching tube S1, control switch pipe S1 conducting.
Further, the preferred comparator U1 of the present embodiment is LMV393 low-voltage comparator U1, since LMV393 is current collection
Pole open circuit output, so the output end in LMV393 needs to connect the five resistance R5 of pull-up resistor-the, resistance value size is mainly according to load
Impedance determines that load impedance is bigger, and the resistance value of pull-up resistor is bigger.
Further, brake control signal generation circuit described in the present embodiment 20 further includes the 6th resistance R6, and described
One end of six resistance R6 is connected with the output end of the comparator U1, the noninverting input phase of the other end and the comparator U1
Even.
6th resistance R6 is the feedback resistance of comparator U1, forms positive feedback network, realizes hysteresis by positive feedback.When adopting
When the voltage collected is lower than reference voltage, reference voltage is drawn high by the 6th resistance R6, is maintained at the output of comparator U1
High level；When collected voltage is higher than reference voltage, reference voltage is dragged down by the 6th resistance R6, makes comparator U1's
Output is maintained at low level.In this way, the output of comparator U1 will not even if collected voltage is hovered near reference voltage
It is vibrated between high low logic level.
Further, brake control signal generation circuit described in the present embodiment 20 further includes the electricity of the 7th resistance R7 and first
Hold C1, the output end of the comparator U1 is successively grounded through the 7th resistance R7, the first capacitor C1, the brake driving
The input terminal of circuit 30 is connected with the common end of the 7th resistance R7 and first capacitor C1.The electricity of 7th resistance R7 and first
The RC filter circuit for holding C1 composition comparator U1 output signal, filters the AC compounent in comparator U1 output signal, avoids handing over
Flow component interferes circuit.
Embodiment 4
The electroless frequency conversion braking circuit of three-phase as described above, the present embodiment is different from place and is, in conjunction with Fig. 2 institute
Show, the brake driving circuit 30 includes driver IC 1, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10, described
The output end of brake control signal generation circuit 20 is successively grounded through the 8th resistance R8, the 9th resistance R9, the drive
The IN+ pin of dynamic device IC1 is connected with the common end of the 8th resistance R8 and the 9th resistance R9；The driver IC 1
IN- pin ground connection；The OUT pin of the driver IC 1 is connected through the tenth resistance R10 with the grid of the switching tube S1.
Specifically, driver IC 1 draws including VCC1 pin, IN+ pin, IN- pin, GND1 pin, GND2 pin, OUT
Foot, VCC2 pin, VCC1 pin and VCC2 pin are connected with DC power supply, and GND1 pin and GND2 pin are grounded.Work as brake
Vehicle controls the IN+ pin that signal generating circuit 20 exports a high-level control signal to driver IC 1, and the OUT of driver IC 1 draws
Foot can export the driving signal of a high level to the grid of switching tube S1, control switch pipe S1 conducting.Wherein, the 8th resistance R8 and
9th resistance R9 is the divider resistance of 1 input terminal of driver IC, avoids the excessively high damage driver IC 1 of input voltage；Tenth resistance
R10 is the current-limiting resistance of 1 output end of driver IC, and avoiding output, electric current is excessive burns switching tube S1.
In this way, the brake driving circuit 30 in the present embodiment can be in the DC bus-bar voltage of the electroless frequency changer circuit 10 of three-phase
The driving signal of a high level is exported when sharply increasing to the grid of switching tube S1, control switch pipe S1 conducting.
It should be noted that any driver for capableing of driving switch pipe S1 can be used as the driver in the present embodiment
IC1.The preferred driver IC 1 of the present embodiment is the EiceDRIVER of InfineonTMSerial single channel gate drivers, including 1EDI and
1EDC series, is encapsulated using compact DSO-8, is capable of providing the output electric current of 2A.The preferred driver IC 1 of the present embodiment is
1EDI20I12MF driver, 1EDI20I12MF driver further include CLAMP pin, CLAMP pin and the tenth resistance R10
It is connected with the common end of the grid of the switching tube IGBT, CLAMP pin is the input of active Miller clamp circuit, can be to defeated
Signal carries out protection clamper out.
Further, the brake driving circuit 30 further includes the second capacitor C2, and the IN+ pin is through second capacitor
(C2) it is grounded.Second capacitor C2 is the filter capacitor of 1 input terminal of driver IC, filters the exchange point in comparator U1 input signal
Amount, avoids AC compounent from interfering circuit.
Further, the brake driving circuit 30 further includes third capacitor C3 and the 4th capacitor C4, the driver IC 1
VCC1 pin be grounded through the third capacitor C3, the VCC2 pin of the driver IC 1 is grounded through the 4th capacitor C4.The
Three capacitor C3 and the 4th capacitor C4 are the filter capacitor of the DC power supply of driver IC 1, filter the AC compounent in DC power supply,
AC compounent is avoided to interfere circuit.
Embodiment 5
The present embodiment provides a kind of air conditioners, including the electroless frequency conversion braking circuit of any one of the above three-phase.This implementation
Example in air conditioner can when the DC bus-bar voltage of the electroless frequency changer circuit 10 of three-phase is sharply increased to DC bus-bar voltage into
Row electric discharge, avoids the power device of the electroless frequency changer circuit 10 of three-phase from being burnt by peak voltage, effectively protects power device.
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 (10)
1. a kind of electroless frequency conversion braking circuit of three-phase, which is characterized in that including the electroless frequency changer circuit of three-phase (10), brake control
Signal generating circuit (20), brake driving circuit (30) and brake control circuit (40) processed, wherein
The DC bus-bar voltage anode and the brake control signal generation circuit of the electroless frequency changer circuit of three-phase (10)
(20) input terminal is connected, the output end of the brake control signal generation circuit (20) and brake driving circuit (30)
Input terminal is connected, and the direct current that the brake control signal generation circuit (20) acquires the electroless frequency changer circuit of three-phase (10) is female
Line voltage simultaneously exports a control signal to the brake driving circuit (30)；
The output end of brake driving circuit (30) is connected with the brake control circuit (40), the brake driving circuit
(30) corresponding driving signal is exported to institute according to the control signal of the brake control signal generation circuit (20) output
State brake control circuit (40)；
The brake control circuit (40) is connected with the electroless frequency changer circuit of the three-phase (10), the brake control circuit (40)
The straight of the electroless frequency changer circuit of three-phase (10) is connected according to the driving signal of brake driving circuit (30) output
The anode and cathode of stream bus simultaneously discharge to DC bus-bar voltage.
2. the electroless frequency conversion braking circuit of three-phase according to claim 1, which is characterized in that the brake control circuit
It (40) include switching tube (S1) and first resistor (R1), the collector of the switching tube (S1) is through the first resistor (R1) and institute
The DC bus anode for stating the electroless frequency changer circuit of three-phase (10) is connected, the emitter of the switching tube (S1) and the three-phase without
The DC bus cathode for being electrolysed frequency changer circuit (10) is connected, the grid of the switching tube (S1) and the brake driving circuit (30)
Output end be connected.
3. the electroless frequency conversion braking circuit of three-phase according to claim 2, which is characterized in that the brake control circuit
It (40) further include diode (D1), the anode of the diode (D1) is connected with the collector of the switching tube (S1), and described two
The cathode of pole pipe (D1) is connected with the DC bus anode of the electroless frequency changer circuit of the three-phase (10).
4. the electroless frequency conversion braking circuit of three-phase according to claim 2, which is characterized in that the brake driving circuit
It (30) include driver (IC1), the 8th resistance (R8), the 9th resistance (R9) and the tenth resistance (R10), the brake control letter
The output end of number generation circuit (20) is successively grounded through the 8th resistance (R8), the 9th resistance (R9), the driver
(IC1) IN+ pin is connected with the common end of the 8th resistance (R8) and the 9th resistance (R9)；The driver
(IC1) IN- pin ground connection；The OUT pin of the driver (IC1) is through the tenth resistance (R10) and the switching tube
(S1) grid is connected.
5. the electroless frequency conversion braking circuit of three-phase according to claim 4, which is characterized in that the brake driving circuit
It (30) further include the second capacitor (C2), the IN+ pin is grounded through second capacitor (C2).
6. the electroless frequency conversion braking circuit of three-phase according to claim 4 or 5, which is characterized in that the brake driving electricity
Road (30) further includes third capacitor (C3) and the 4th capacitor (C4), and the VCC1 pin of the driver (IC1) is through the third electricity
Hold (C3) ground connection, the VCC2 pin of the driver (IC1) is grounded through the 4th capacitor (C4).
7. -5 any electroless frequency conversion braking circuit of three-phase according to claim 1, which is characterized in that the brake control
Signal generating circuit (20) includes comparator (U1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4) and the 5th
Resistance (R5), the DC bus-bar voltage anode of the electroless frequency changer circuit of three-phase (10) pass through described after being sampled by divider resistance
Second resistance (R2) is connected with the noninverting input of the comparator (U1)；Reference voltage source is successively through the 3rd resistor
(R3), the 4th resistance (R4) ground connection, the reverse input end of the comparator (U1) and the 3rd resistor (R3) and described
The common end of 4th resistance (R4) is connected；The output end of the comparator (U1) is divided into two-way, all the way through the 5th resistance
(R5) it is connected with DC power supply, another way is connected with the input terminal of brake driving circuit (30).
8. the electroless frequency conversion braking circuit of three-phase according to claim 7, which is characterized in that the brake control signal produces
Raw circuit (20) further include the 6th resistance (R6), one end of the 6th resistance (R6) and the output end phase of the comparator (U1)
Even, the other end is connected with the noninverting input of the comparator (U1).
9. the electroless frequency conversion braking circuit of three-phase according to claim 8, which is characterized in that the brake control signal produces
Raw circuit (20) further include the 7th resistance (R7) and first capacitor (C1), and the output end of the comparator (U1) is successively through described the
Seven resistance (R7), the first capacitor (C1) ground connection, the input terminal and the 7th resistance of brake driving circuit (30)
(R7) it is connected with the common end of the first capacitor (C1).
10. a kind of air conditioner, which is characterized in that including the electroless frequency conversion brake of such as described in any item three-phases of claim 1-9
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821712342.6U CN208797860U (en) | 2018-10-22 | 2018-10-22 | A kind of electroless frequency conversion braking circuit of three-phase and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821712342.6U CN208797860U (en) | 2018-10-22 | 2018-10-22 | A kind of electroless frequency conversion braking circuit of three-phase and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208797860U true CN208797860U (en) | 2019-04-26 |
Family
ID=66212211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821712342.6U Active CN208797860U (en) | 2018-10-22 | 2018-10-22 | A kind of electroless frequency conversion braking circuit of three-phase and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208797860U (en) |
-
2018
- 2018-10-22 CN CN201821712342.6U patent/CN208797860U/en active Active
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