CN208937644U - Braking resistor qualitative detection circuit and its frequency converter - Google Patents
Braking resistor qualitative detection circuit and its frequency converter Download PDFInfo
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- CN208937644U CN208937644U CN201821403865.2U CN201821403865U CN208937644U CN 208937644 U CN208937644 U CN 208937644U CN 201821403865 U CN201821403865 U CN 201821403865U CN 208937644 U CN208937644 U CN 208937644U
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Abstract
The utility model discloses a kind of braking resistor qualitative detection circuits, including control module, decompression drive module, voltage reduction module, the first comparison module, the second comparison module and signal output module；The control decompression drive module output drive signal driving voltage reduction module work of control module output drive signal；The input terminal voltage signal of voltage reduction module is compared by the first comparison module and the first reference voltage and exports the first comparison signal, the input terminal voltage signal of voltage reduction module passes through the second comparison module simultaneously and the second reference voltage compares and exports the second comparison signal, by signal output module upload control module, control module qualitatively judges braking resistor according to the signal of upload for first comparison signal and the second comparison signal.The invention also discloses the frequency converters including the braking resistor qualitative detection circuit.The utility model realizes the qualitative detection to connecting resistance outside frequency converter, and testing result is true and reliable, and circuit cost is cheap.
Description
Technical field
The utility model is specifically related to a kind of braking resistor qualitative detection circuit and its frequency converter.
Background technique
With the development of economic technology, the theory of environmental protection has been come into the daily production and life of people.Become
Frequency technology, it is energy saving with it, efficient and controllable the advantages that, have been widely used in people's production and life, to people's
Production and life bring endless convenience.
Frequency converter is the main carriers for realizing converter technique, and the external variable-frequency motor of frequency converter can be realized to motor
Frequency control.Existing frequency converter is especially applied to the frequency converter of the occasions such as elevator, elevator, mine car, due to its applied field
It closes and there are the damped conditions such as band load decline, and under such operating condition, frequency converter is in generating state, therefore such frequency converter one
As be equipped with braking resistor, for frequency converter band carry decline etc. band carry damped condition under, using braking resistor consumption bus on
Extra energy.
Be as shown in Figure 1 the schematic diagram of existing common braking resistor and its control circuit: DC+ in figure, DC- represent frequency conversion
The DC bus positive and negative anodes of device, Q1 are the IGBT of the control braking resistor conducting built in frequency converter, control signal PWM1 by frequency conversion
Control chip inside device generates, and in working PWM duty ratio it is adjustable, U1 is the driving circuit for driving Q1 work, is had
PWM1 is controlled, and R1 is the braking resistor for needing user oneself external, and frequency converter is that there are special connecting terminal by user.Therefore
For a user, it is only necessary to the external braking resistor in the respective terminal of frequency converter equipment, so that it may realize the function of braking.But
It is the external braking resistor of user in practical applications, it occur frequently that the case where wrong resistance value, if resistance is excessive, meeting
Cause using when there are problems that braking energy cannot rapidly deplete, thus cause the frequent over-voltage of frequency converter even aircraft bombing thing
Therefore if resistance value is too small, it is likely that cause to brake IGBT overcurrent or braking resistor fever is serious, being likely to can be to use
Bring unnecessary economic loss in family.
But at present there has been no the device of the qualitative judgement about the external braking resistor of frequency converter, this makes frequency converter exist
After external braking resistor, there are some potential safety problemss.
Utility model content
One of the purpose of this utility model is that qualitative detection can be carried out to the braking resistor of frequency converter by providing one kind
Braking resistor qualitative detection circuit.
The two of the purpose of this utility model be to provide it is a kind of include the braking resistor qualitative detection circuit frequency conversion
Device.
This braking resistor qualitative detection circuit provided by the utility model, including control module, decompression drive module, drop
Die block, the first comparison module, the second comparison module and signal output module；Decompression drive module is concatenated with voltage reduction module, is dropped
The output end of die block is connected between braking resistor and IGHT；The input terminal of voltage reduction module connect simultaneously the first comparison module and
The output end of second comparison module, the first comparison module and the second comparison module is all connected with signal output module；Control module connects
Connect the input terminal of decompression drive module, while the also output end of connection signal output module；Control module output drive signal control
System decompression drive module output drive signal driving voltage reduction module work；The input terminal voltage signal of voltage reduction module compares by first
The first comparison signal is compared and exports compared with module and the first reference voltage, the input terminal voltage signal of voltage reduction module leads to simultaneously
It crosses the second comparison module and the second reference voltage compares and export the second comparison signal, the first comparison signal and second are compared
By signal output module upload control module, control module qualitative sentence to braking resistor signal according to the signal of upload
It is disconnected.
The braking resistor qualitative detection circuit further includes output isolation module；It is defeated that output isolation module is connected to signal
The input terminal of module out, for carrying out electrical isolation to the signal for being input to signal output module.
The output isolation module is optical coupling module.
The control module is independent controller, or is the controller inside frequency converter.
The decompression drive module includes decompression optocoupler input resistance, decompression optocoupler and dropping resistor；It is defeated to be depressured optocoupler
Enter resistance and connect with the one end for being depressured optocoupler primary side, the other end ground connection of decompression optocoupler primary side, the secondary side one end for being depressured optocoupler connects
Dropping resistor is connect, the input terminal of the secondary side other end connection reduction voltage circuit of optocoupler is depressured；
The voltage reduction module is the diode of several concatenations.
The signal output module includes first and door and second and door, first with the output of the first comparison module of goalkeeper
The driving signal progress and operation to decompression drive module of first comparison signal and control module output, and export the first detection
Signal is to control module；What the second the second comparison signal exported with the second comparison module of goalkeeper and control module exported arrives decompression
The driving signal of drive module carries out and operation, and exports the second detection signal to control module.
The utility model additionally provides a kind of frequency converter, and the frequency converter includes above-mentioned braking resistor qualitative detection electricity
Road.
This braking resistor qualitative detection circuit and its frequency converter provided by the utility model pass through the reliable circuit of science
Design, realizes the qualitative detection to connecting resistance outside frequency converter, and testing result is true and reliable, circuit cost is cheap.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of existing brake resistor for frequency converter and its control circuit.
Fig. 2 is the functional block diagram of the utility model.
Fig. 3 is the circuit diagram of the utility model.
Specific embodiment
It is illustrated in figure 2 the functional block diagram of the utility model: this qualitative inspection of braking resistor provided by the utility model
Slowdown monitoring circuit, including control module, decompression drive module, voltage reduction module, the first comparison module, the second comparison module and signal output
Module；Decompression drive module is concatenated with voltage reduction module, and the output end of voltage reduction module is connected between braking resistor and IGHT；Decompression
The input terminal of module connects the first comparison module and the second comparison module simultaneously, the first comparison module and the second comparison module it is defeated
Outlet is all connected with signal output module；The input terminal of control module connection decompression drive module, while also connection signal exports mould
The output end of block；The control decompression drive module output drive signal driving voltage reduction module work of control module output drive signal；
Compared with the input terminal voltage signal of voltage reduction module is compared with the first reference voltage by the first comparison module and exports first
Signal, the input terminal voltage signal of voltage reduction module pass through the second comparison module simultaneously and compare and export with the second reference voltage
Second comparison signal, the first comparison signal and the second comparison signal pass through signal output module upload control module, control module
Braking resistor is qualitatively judged according to the signal of upload.It in the specific implementation, can also be in the input of signal output module
End connection output isolation module, for carrying out electrical isolation to the signal for being input to signal output module.In addition, the control in figure
Module can be independent controller, or be the controller inside frequency converter.
It is illustrated in figure 3 the circuit diagram of the utility model:
Being depressured drive module includes decompression optocoupler input resistance R3, decompression optocoupler G1 and dropping resistor R2；It is defeated to be depressured optocoupler
Enter resistance and connect with the one end for being depressured optocoupler primary side, the other end ground connection of decompression optocoupler primary side, the secondary side one end for being depressured optocoupler connects
Dropping resistor is connect, the input terminal of the secondary side other end connection reduction voltage circuit of optocoupler is depressured；
Voltage reduction module is the diode (two diodes D1 and D2 using in figure) of several concatenations.
Signal output module includes first and door U3 and second and door U4, and first and the of the output of the first comparison module of goalkeeper
The one comparison signal Vim2 and driving signal PWM1 to decompression drive module of control module output is carried out and operation, and export the
One detects signal Vo1 to control module；Second the second comparison signal Vim3 exported with the second comparison module of goalkeeper and control mould
The driving signal PWM to decompression drive module of block output is carried out and operation, and exports the second detection signal Vo2 to controlling mould
Block.Wherein, the reference voltage of the first comparison module (in figure be U2, comparator) is Vref1, the second comparison module (it is U3 in figure,
Comparator) base station voltage be Vref2.
Two the optocouplers G2 and G3 that output isolation module then uses.
Below in conjunction with a specific embodiment, the utility model is further described:
In figure, VDC 5V, R2 are that 10K Ω, R3 and R4 are 1K, and Vref1 is that 2.5V(can be adjusted according to the actual situation, this
Case only does special case explanation), Vref2 is that 3.5V(can be adjusted according to the actual situation, and present case only does special case explanation).
When testing braking resistor, frequency converter is first completed to power on after pre-charge process, exports PWM1 signal, should
G1 can be connected when being in high level in signal, so that DC bus-bar voltage is added on braking resistor R1, at the same time, Q1 conduct
A kind of IGBT device can generate tube voltage drop VCE when a current flows through, and basic law is that tube voltage drop voltage value is bigger, explanation
The electric current for flowing through IGBT is bigger.
In the implementation case, since DC bus-bar voltage is that substantially stationary (AC-input voltage of 380V corresponds to
The DC bus-bar voltage of 536V), therefore the size of tube voltage drop voltage value just corresponds to the size of braking resistor value, the present embodiment root
According to the homologous thread of actual requirement and IGBT tube voltage drop and electric current to braking resistor magnitude range, obtains and hindered in braking resistor
It is worth in normal range (NR), corresponding tube voltage drop range is 1.1V ~ 2.1V, when tube voltage drop is lower than 1.1V, illustrate that braking resistor is excessive,
Conversely, illustrating that braking resistor value is too small when tube voltage drop is higher than 2.1V.Specifically, it is divided into following several situations:
Situation 1:
In circuit, PWM1 is in high level, under Q1 on state, if the conducting tube voltage drop of Q1 is lower than 1.1V, such as 1V,
Then diode D1 and D2 is in forward conduction state, and the level at Vm1 is 1.0+0.7+0.7=2.4V, is lower than reference voltage
Vref1 and Vref2, therefore the output Vm2 of comparator U2 is high level in figure, the output of comparator U3 is low level, final to pass through
Cross isolation circuit and compared with PWM1 signal gate circuit processing after, Vo1 is high level, and Vo2 is low level.Braking is represented at this time
Resistance selection is excessive.
Situation 2:
In circuit, PWM1 is in high level, under Q1 on state, if the conducting tube voltage drop of Q1 is higher than 2.1V, such as
2.2V, then diode D1 and D2 is in forward conduction, and the level at Vm1 is 2.2+0.7+0.7=3.6V, is higher than reference voltage
Vref1 and Vref2, therefore the output Vm2 of comparator U2 is low level in figure two, the output Vm3 of comparator U3 is high level, most
Eventually after isolation circuit and the gate circuit compared with PWM1 signal are handled, Vo1 is low level, and Vo2 is high level.It represents at this time
Braking resistor selection is too small.If the instantaneous tube voltage drop of Q1 is excessive, such as more than 3.6V, then due to 3.6+0.7+0.7=
5.0V, the voltage value are greater than VDC(5V), therefore diode can most terminate in reversed cut-off at this point, the voltage value of Vm1 is 5V
Fruit is also that braking resistor is too small.
Situation 3:
In circuit, PWM1 is in high level, under Q1 on state, if the conducting tube voltage drop of Q1 be in 1.1V and 2.1V it
Between, such as 1.6V, then diode D1 and D2 is in forward conduction, and the level at Vm1 is 1.6+0.7+0.7=3.0V, is higher than ginseng
It examines voltage Vref1 but the output Vm2 of comparator U2 is low level lower than reference voltage Vref 2, therefore in figure two, comparator U3's
Output Vm3 be low level, eventually pass through isolation circuit and compared with PWM1 signal gate circuit processing after, Vo1 is low level,
Vo2 is low level.It is normal that braking resistor selection is represented at this time.
Situation 4:
In circuit, PWM1 is in low level state, and Q1 is not turned on, and does not have electric current to flow through braking resistor on DC bus, because
This is in non-testing time, and at this time although the collector terminal voltage of Q1 has reached DC+ (536V or so), but due to diode D1
It is in reverse blocking state with D2, therefore the low-voltage circuit in figure not will receive high pressure damage, and Vo1 and Vo2 are equal at this time
Export low level.
In conclusion braking resistor is being installed or replaced to the utility model when being applied to potential energy loading high occasion,
Afterwards, braking resistor test function is executed, if detecting that Vo1 exports high level in test process, and Vo2 exports low level, then
It is considered that braking resistor selection is excessive, if detecting that Vo1 exports low level in test process, and Vo2 exports high level,
It may be considered that braking resistor selection is too small.Therefore the braking resistor resistance value that can eaily judge that user is connect is
No to meet the requirements, so as to the safety that better safeguards system braking resistor uses, it is improper to avoid selecting because of braking resistor
The accident of initiation.
Claims (5)
1. a kind of braking resistor qualitative detection circuit, it is characterised in that including control module, decompression drive module, voltage reduction module,
First comparison module, the second comparison module, output isolation module and signal output module；It is depressured drive module and voltage reduction module string
It connects, the output end of voltage reduction module is connected between braking resistor and IGHT；The input terminal of voltage reduction module connects first simultaneously and compares
The output end of module and the second comparison module, the first comparison module and the second comparison module is all connected with signal output module；Control
The input terminal of module connection decompression drive module, while the also output end of connection signal output module；Control module output driving
Signal control decompression drive module output drive signal driving voltage reduction module work；The input terminal voltage signal of voltage reduction module passes through
First comparison module and the first reference voltage compare and export the first comparison signal, the input terminal voltage signal of voltage reduction module
Compare and export the second comparison signal by the second comparison module and the second reference voltage simultaneously, the first comparison signal and the
Two comparison signals determine braking resistor according to the signal of upload by signal output module upload control module, control module
Property judgement；Output isolation module is connected to the input terminal of signal output module, for the signal for being input to signal output module
Carry out electrical isolation；The decompression drive module includes decompression optocoupler input resistance, decompression optocoupler and dropping resistor；It is depressured light
Coupling input resistance is connect with one end of decompression optocoupler primary side, and the other end ground connection of decompression optocoupler primary side is depressured the secondary side one of optocoupler
Connection dropping resistor in end is depressured the input terminal of the secondary side other end connection reduction voltage circuit of optocoupler；The signal output module packet
Include first and door and second and door, first with the first comparison signal of the first comparison module of goalkeeper output and control module output
Driving signal to decompression drive module carries out and operation, and exports first detection signal to control module；Second with goalkeeper the
The driving signal to decompression drive module that the second comparison signal and control module of the output of two comparison modules export is carried out and is grasped
Make, and exports the second detection signal to control module.
2. braking resistor qualitative detection circuit according to claim 1, it is characterised in that the output isolation module is
Optical coupling module.
3. braking resistor qualitative detection circuit according to claim 1, it is characterised in that the control module is independent
Controller, or be the controller inside frequency converter.
4. braking resistor qualitative detection circuit described according to claim 1 ~ one of 3, it is characterised in that the voltage reduction module
For the diode of several concatenations.
5. a kind of frequency converter, it is characterised in that include braking resistor qualitative detection circuit described in one of claim 1 ~ 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821403865.2U CN208937644U (en) | 2018-08-29 | 2018-08-29 | Braking resistor qualitative detection circuit and its frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821403865.2U CN208937644U (en) | 2018-08-29 | 2018-08-29 | Braking resistor qualitative detection circuit and its frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN208937644U true CN208937644U (en) | 2019-06-04 |
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ID=66719163
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821403865.2U Active CN208937644U (en) | 2018-08-29 | 2018-08-29 | Braking resistor qualitative detection circuit and its frequency converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
| CN112630538A (en) * | 2019-09-24 | 2021-04-09 | 台达电子工业股份有限公司 | Method for estimating brake resistance |
| TWI724557B (en) * | 2019-09-24 | 2021-04-11 | 台達電子工業股份有限公司 | Estamating method for braking resistor |
| CN112671254A (en) * | 2019-10-16 | 2021-04-16 | 广州汽车集团股份有限公司 | Inverter circuit |
-
2018
- 2018-08-29 CN CN201821403865.2U patent/CN208937644U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112630538A (en) * | 2019-09-24 | 2021-04-09 | 台达电子工业股份有限公司 | Method for estimating brake resistance |
| TWI724557B (en) * | 2019-09-24 | 2021-04-11 | 台達電子工業股份有限公司 | Estamating method for braking resistor |
| US11397203B2 (en) | 2019-09-24 | 2022-07-26 | Delta Electronics, Inc. | Estimating method for braking resistor |
| CN112630538B (en) * | 2019-09-24 | 2024-04-16 | 台达电子工业股份有限公司 | Method for estimating braking resistance |
| CN112671254A (en) * | 2019-10-16 | 2021-04-16 | 广州汽车集团股份有限公司 | Inverter circuit |
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
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