CN106602856B - A kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage - Google Patents
A kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage Download PDFInfo
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- CN106602856B CN106602856B CN201510684680.8A CN201510684680A CN106602856B CN 106602856 B CN106602856 B CN 106602856B CN 201510684680 A CN201510684680 A CN 201510684680A CN 106602856 B CN106602856 B CN 106602856B
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Abstract
The present invention relates to Motor Control Fields; more particularly to a kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage; the hardware protection circuit of driver busbar voltage over-voltage includes resistance, subtracter, comparator, driving chip, saw-tooth wave generating circuit, reference power supply; P-channel enhancement type FET and diode; resistance includes first resistor, divider resistance and power resistor, and the hardware protection method of driver busbar voltage over-voltage is the following steps are included: carry out reduced output voltage signal voltage for driver bus by two resistance；Signal voltage is compared by subtracter and comparator；Comparison result inputs driving chip, and driving chip controls the opening and closing of P-channel enhancement type FET, and P-channel enhancement type FET controls consumption of the power resistor to braking energy；The configuration of the present invention is simple is not the on-off of controllable braking axle arm by software, increases the reliability of braking circuit.
Description
Technical field
The present invention relates to the hardware protection circuit of Motor Control Field more particularly to a kind of driver busbar voltage over-voltage and
Its method.
Background technique
When servo motor braking, which is in generating state.It is watched this means that energy will return to
It takes on the DC bus of driver.Because DC bus includes capacitor, DC bus-bar voltage can rise.Voltage is increased more
It is few to depend on starting the capacity that the kinetic energy of motor and direct current bus bar are held when braking.Therefore it needs to excessive busbar voltage
It is protected.
Existing busbar voltage safeguard measure is often off motor operation, and actually busbar voltage is excessive only to go out
Motor stoppage in transit is inappropriate by now of short duration on-position.
If braking kinetic energy is greater than the capacitance on DC bus, while not having other drive containments should on DC bus
Energy, then driver can consume the energy by braking resistor.In order to realize resistive braking, existing digital control technology
DC bus-bar voltage is mostly used to sample, to control the consumption of braking bridge arm opened to realize braking energy.This mode occupies
The calculating time of CPU, while correct voltage sample must be relied on, when sampling failure or software responses not in time, will cause straight
Flowing busbar voltage is more than for a long time threshold value, and capacitor is be easy to cause to burn.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of hardware controls electricity for capableing of adjust automatically DC bus-bar voltage
Road and its method realize the hardware protection of busbar voltage over-voltage by busbar voltage limit value within the specified upper limit.
The technical solution of the present invention is as follows:
A kind of hardware protection circuit of driver busbar voltage over-voltage, including resistance, subtracter, comparator, driving chip,
Saw-tooth wave generating circuit, reference power supply, P-channel enhancement type FET and diode, resistance include first resistor, divider resistance
And power resistor, circuit connecting mode are as follows:
The first resistor input terminal connection driver bus anode, the first resistor output end are separately connected partial pressure electricity
The non-inverting input terminal of input terminal and subtracter is hindered, the divider resistance output end connects driver bus cathode, the subtracter
Inverting input terminal connect benchmark positive pole, the reference power supply cathode connects divider resistance output end, and the subtracter is defeated
Outlet connects the comparator non-inverting input terminal, and the comparator inverting input terminal connects saw-tooth wave generating circuit input terminal, institute
Saw-tooth wave generating circuit output end connection driver bus cathode is stated, the comparator output terminal connects driving chip input terminal,
The driving chip output end connects P-channel enhancement type FET grid, the P-channel enhancement type FET drain electrode connection
Diode cathode, the P-channel enhancement type FET source electrode connect power resistor input terminal, and the diode anode connection is driven
Dynamic device bus anode, the power resistor output end connect driver bus cathode.
Preferably, the divider resistance and the resistance ratio of first resistor are 1:99, and effect is so that branch pressure voltage is
The 1/100 of voltage rating.
Preferably, the subtracter subtracts each other one of musical instruments used in a Buddhist or Taoist mass or reverse phase subtracter using same.
Preferably, the comparator uses voltage comparator.
Preferably, a PN diode is connected between the source electrode and drain electrode of the P-channel enhancement type FET, this
PN diode is not act on, but play a part of to protect this metal-oxide-semiconductor in the circuit of metal-oxide-semiconductor composition in this independent metal-oxide-semiconductor, is prevented
It is only reversed breakdown, PN diode is association when P-channel enhancement type FET produces, without manually installed.
The invention also includes a kind of hardware protection methods of driver busbar voltage over-voltage, comprising the following steps:
Step 1 carries out reduced output voltage signal voltage for driver bus by two resistance；
Step 2, by signal voltage, by subtracter and reference voltage progress subtraction, (signal voltage value subtracts benchmark
Voltage value), subtracter exports operation result to comparator, and comparator passes through sawtooth to subtracter output valve and driver bus
The sawtooth voltage value that wave generation circuit generates is compared；
The comparison result of step 2 is inputted driving chip by step 3, and driving chip controls P-channel enhancement type FET
Opening and closing, P-channel enhancement type FET controls consumption of the power resistor to braking energy.
Preferably, in the step 2, when signal voltage is less than reference voltage, subtracter output is negative value, comparator
Low level is then exported, that is, logic effects are not generated to driving chip.
When the difference of signal voltage and reference voltage is 0~1, subtracter output is 0~1, and comparator then exports PWM letter
Number,
When the difference of signal voltage and reference voltage is greater than 1, subtracter output is, greater than 1, comparator then exports high level.
Preferably, in the step 3, when comparator is to driving chip input low level, driving chip attonity,
When comparator inputs pwm signal to driving chip, driving chip exports copped wave to P-channel enhancement type FET
Signal, the electric current that P-channel enhancement type FET then conveys drain electrode to source electrode carry out copped wave output, and power resistor is spaced
Formula energy consumption,
When comparator is to driving chip input high level, it is normally opened that driving chip controls P-channel enhancement type FET, P
Drain electrode is then directly inputted power resistor to the electric current that source electrode conveys by channel enhancement field-effect tube, and power resistor carries out normality formula
Energy consumption.
Preferably, in the step 1 two resistance one of them be divider resistance, voltage is driver bus after partial pressure
The 1/100 of voltage.
The invention has the benefit that circuit structure of the present invention is simple, it is not the logical of controllable braking axle arm by software
It is disconnected, increase the reliability of braking circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hardware protection circuit of driver busbar voltage over-voltage of the present invention；
Fig. 2 is present invention busbar voltage and brake switch status diagram in embodiment.
In figure, 1, first resistor；2, divider resistance；3, subtracter；4, reference power supply；5, comparator；6, sawtooth wave occurs
Circuit；7, driving chip；8, P-channel enhancement type FET；9, diode；10, power resistor.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
As shown in Figure 1, a kind of hardware protection circuit of driver busbar voltage over-voltage, including 3 resistance, 1 subtracter,
1 comparator, 1 driving chip, 1 saw-tooth wave generating circuit, 1 reference power supply, 1 P-channel enhancement type FET and 1
A diode, resistance include first resistor, divider resistance and power resistor, circuit connecting mode are as follows:
1 input terminal of the first resistor connection driver bus anode, 1 output end of first resistor are separately connected partial pressure
The non-inverting input terminal of resistance 2 input terminal and subtracter 3,2 output end of divider resistance connects driver bus cathode, described to subtract
4 anode of inverting input terminal connection reference power supply of musical instruments used in a Buddhist or Taoist mass 3,4 cathode of reference power supply connects 2 output end of divider resistance, described
3 output end of subtracter connects 5 non-inverting input terminal of comparator, and 5 inverting input terminal of the comparator connection saw-tooth wave generating circuit 6 is defeated
Enter end, 6 output end of saw-tooth wave generating circuit connects driver bus cathode, 5 output end of the comparator connection driving core
7 input terminal of piece, 7 output end of driving chip connect 8 grid of P-channel enhancement type FET, the P-channel enhancement type field effect
Should drain electrode connection 9 cathode of diode of pipe 8,8 source electrode of P-channel enhancement type FET connects 10 input terminal of power resistor, institute
It states diode anode 9 and connects driver bus anode, 10 output end of power resistor connects driver bus cathode.
The divider resistance 2 and the resistance ratio of first resistor 1 are 1:99, and effect is so that branch pressure voltage is specified electricity
The 1/100 of pressure.
The subtracter 3 subtracts each other one of musical instruments used in a Buddhist or Taoist mass or reverse phase subtracter using same.
The comparator 5 uses voltage comparator.
A PN diode is connected between the source electrode and drain electrode of the P-channel enhancement type FET 8.
A kind of hardware protection method of driver busbar voltage over-voltage, comprising the following steps:
Step 1 carries out reduced output voltage signal voltage for driver bus by two resistance；
Step 2, by signal voltage, by subtracter and reference voltage progress subtraction, (signal voltage value subtracts benchmark
Voltage value), subtracter exports operation result to comparator, and comparator passes through sawtooth to subtracter output valve and driver bus
The sawtooth voltage value that wave generation circuit generates is compared；
The comparison result of step 2 is inputted driving chip by step 3, and driving chip controls P-channel enhancement type FET
Opening and closing, P-channel enhancement type FET controls consumption of the power resistor to braking energy.
As shown in Fig. 2, when signal voltage is less than reference voltage, subtracter output is negative value in the step 2, compare
Device then exports low level (namely not generating logic effects to driving chip),
When the difference of signal voltage and reference voltage is 0~1, subtracter output is 0~1, and comparator then exports PWM letter
Number,
When the difference of signal voltage and reference voltage is greater than 1, subtracter output is, greater than 1, comparator then exports high level.
In the step 3, when comparator is to driving chip input low level, driving chip attonity,
When comparator inputs pwm signal to driving chip, driving chip exports copped wave to P-channel enhancement type FET
Signal, the electric current that P-channel enhancement type FET then conveys drain electrode to source electrode carry out copped wave output, and power resistor is spaced
Formula energy consumption,
When comparator is to driving chip input high level, it is normally opened that driving chip controls P-channel enhancement type FET, P
Drain electrode is then directly inputted power resistor to the electric current that source electrode conveys by channel enhancement field-effect tube, and power resistor carries out normality formula
Energy consumption.
In the step 1 two resistance one of them be divider resistance, voltage is the 1/ of driver busbar voltage after partial pressure
100。
The above embodiments and description only illustrate the principle of the present invention and most preferred embodiment, is not departing from this
Under the premise of spirit and range, various changes and improvements may be made to the invention, these changes and improvements both fall within requirement and protect
In the scope of the invention of shield.
Claims (8)
1. a kind of hardware protection circuit of driver busbar voltage over-voltage, including resistance, subtracter, comparator, driving chip, saw
Tooth wave generation circuit, reference power supply, P-channel enhancement type FET and diode, the resistance include first resistor, partial pressure electricity
Resistance and power resistor, which is characterized in that its circuit connecting mode are as follows:
The first resistor input terminal connection driver bus anode, it is defeated that the first resistor output end is separately connected divider resistance
Enter the non-inverting input terminal of end and subtracter, the divider resistance output end connects driver bus cathode, the subtracter it is anti-
Phase input terminal connects benchmark positive pole, and the reference power supply cathode connects divider resistance output end, the subtractor outputs
The comparator non-inverting input terminal is connected, the comparator inverting input terminal connects saw-tooth wave generating circuit input terminal, the saw
Tooth wave generation circuit output end connects driver bus cathode, and the comparator output terminal connects driving chip input terminal, described
Driving chip output end connects P-channel enhancement type FET grid, two poles of the P-channel enhancement type FET drain electrode connection
Tube cathode, the P-channel enhancement type FET source electrode connect power resistor input terminal, and the diode anode connects driver
Bus anode, the power resistor output end connect driver bus cathode；It is exported according to the first resistor and divider resistance
Signal voltage, different level values is inputted from comparator to driving chip, so that the driving chip is according to the level value
Control the energy consumption that power resistor carries out different mode；
Specifically, when comparator is to driving chip input low level, driving chip attonity；
When comparator inputs pwm signal to driving chip, driving chip is believed to P-channel enhancement type FET output copped wave
Number, the electric current that P-channel enhancement type FET then conveys drain electrode to source electrode carries out copped wave output, and power resistor carries out compartment
Energy consumption；
When comparator is to driving chip input high level, it is normally opened that driving chip controls P-channel enhancement type FET, P-channel
Drain electrode is then directly inputted power resistor to the electric current that source electrode conveys by enhanced field-effect tube, and the power resistor carries out normality formula
Energy consumption.
2. the hardware protection circuit of driver busbar voltage over-voltage according to claim 1, it is characterised in that: the partial pressure
Resistance and the resistance ratio of first resistor are 1:99.
3. the hardware protection circuit of driver busbar voltage over-voltage according to claim 1, it is characterised in that: the subtraction
Device subtracts each other one of musical instruments used in a Buddhist or Taoist mass or reverse phase subtracter using same.
4. the hardware protection circuit of driver busbar voltage over-voltage according to claim 1, it is characterised in that: the comparison
Device uses voltage comparator.
5. the hardware protection circuit of driver busbar voltage over-voltage according to claim 1, it is characterised in that: the P ditch
A PN diode is connected between the source electrode and drain electrode of the enhanced field-effect tube in road.
6. a kind of hardware protection method of driver busbar voltage over-voltage, which is characterized in that guard method the following steps are included:
Step 1 carries out the adjusting of reduced output voltage signal voltage, described two resistance packets for driver bus by two resistance
Include first resistor and divider resistance；
Signal voltage is carried out subtraction by subtracter and reference voltage by step 2, subtracter by operation result export to
Comparator, the sawtooth voltage value that comparator generates subtracter output valve and driver bus by saw-tooth wave generating circuit into
Row compares；
The comparison result of step 2 is inputted driving chip by step 3, and driving chip control P-channel enhancement type FET is opened
It opens and closes, P-channel enhancement type FET controls consumption of the power resistor to braking energy；
The step 3 specifically includes:
When comparator is to driving chip input low level, driving chip attonity；
When comparator inputs pwm signal to driving chip, driving chip is believed to P-channel enhancement type FET output copped wave
Number, the electric current that P-channel enhancement type FET then conveys drain electrode to source electrode carries out copped wave output, and power resistor carries out compartment
Energy consumption；
When comparator is to driving chip input high level, it is normally opened that driving chip controls P-channel enhancement type FET, P-channel
Drain electrode is then directly inputted power resistor to the electric current that source electrode conveys by enhanced field-effect tube, and the power resistor carries out normality formula
Energy consumption.
7. the hardware protection method of driver busbar voltage over-voltage according to claim 6, it is characterised in that: the step
In two, when signal voltage is less than reference voltage, subtracter output is negative value, and comparator then exports low level,
When the difference of signal voltage and reference voltage is 0~1, subtracter output is 0~1, comparator then output pwm signal,
When the difference of signal voltage and reference voltage is greater than 1, subtracter output is, greater than 1, comparator then exports high level.
8. the hardware protection method of driver busbar voltage over-voltage according to claim 6, it is characterised in that: the step
In one two resistance one of them be divider resistance, voltage is the 1/100 of driver busbar voltage after partial pressure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684680.8A CN106602856B (en) | 2015-10-20 | 2015-10-20 | A kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684680.8A CN106602856B (en) | 2015-10-20 | 2015-10-20 | A kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage |
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| CN106602856B true CN106602856B (en) | 2019-01-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038483A (en) * | 2018-10-31 | 2018-12-18 | 奥克斯空调股份有限公司 | Overvoltage crowbar |
| CN113193736B (en) * | 2021-05-07 | 2023-07-11 | 深圳市三行技术有限公司 | Medium-voltage variable-frequency brake unit topological structure and voltage reduction method of bus thereof |
| CN113541118A (en) * | 2021-08-17 | 2021-10-22 | 苏州伟创电气科技股份有限公司 | Bus overvoltage protection circuit |
| CN114301340A (en) * | 2021-11-24 | 2022-04-08 | 湖州太平微特电机有限公司 | Starter generator controller and control method thereof |
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|---|---|---|---|---|
| CN102255302A (en) * | 2011-06-29 | 2011-11-23 | 深圳市天微电子有限公司 | Overvoltage protection circuit and IC (integrated circuit) |
| CN102411382A (en) * | 2011-09-30 | 2012-04-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Temperature control circuit preventing temperature overshoot |
| CN102437771A (en) * | 2011-11-28 | 2012-05-02 | 联合汽车电子有限公司 | Passive discharging circuit of inverter input terminal |
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- 2015-10-20 CN CN201510684680.8A patent/CN106602856B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255302A (en) * | 2011-06-29 | 2011-11-23 | 深圳市天微电子有限公司 | Overvoltage protection circuit and IC (integrated circuit) |
| CN102411382A (en) * | 2011-09-30 | 2012-04-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Temperature control circuit preventing temperature overshoot |
| CN102437771A (en) * | 2011-11-28 | 2012-05-02 | 联合汽车电子有限公司 | Passive discharging circuit of inverter input terminal |
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