CN107769675A - A kind of discharging circuit of direct current generator - Google Patents
A kind of discharging circuit of direct current generator Download PDFInfo
- Publication number
- CN107769675A CN107769675A CN201710978106.2A CN201710978106A CN107769675A CN 107769675 A CN107769675 A CN 107769675A CN 201710978106 A CN201710978106 A CN 201710978106A CN 107769675 A CN107769675 A CN 107769675A
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- China
- Prior art keywords
- voltage
- module
- voltage stabilizing
- power supply
- resistance
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of discharging circuit of direct current generator, its technical characterstic is：Including power supply, voltage stabilizing circuit module, over-pressed judge module, electronic switch module and electric power generation unloading resistance R3；Positive pole of the positive pole of the power supply respectively with voltage stabilizing circuit module, over-pressed judge module, electric power generation unloading resistance R3 one end and direct current generator is connected；The power supply obtained from dc bus is entered after line translation and voltage stabilizing output to over-pressed judge module by one output end of the voltage stabilizing circuit module, another output end output of the Voltage stabilizing module all the way reference voltage signal to over-pressed judge module；The output end of the over-pressed judge module is connected with electronic switch module, for sending switch order to electronic switch module.Whole discharging circuit can be integrated on one piece of small wiring board by the present invention, be directly parallel between motor positive-negative power supply terminal, it is not necessary to extra accessory power supply.
Description
Technical field
The invention belongs to DC motor technology field, especially a kind of discharging circuit of direct current generator.
Background technology
The output end load of dc source is motor, and power supply stops the moment of output, and motor rotor is still by used
Property operating, now motor is changed into dynamotor mode of operation.The mechanical kinetic energy of storage is converted into electric energy, is applied to electronic
Between the positive and negative power supply terminal of machine, we term it reflected energy.Reflected voltage is identical with supply voltage polarity, and if motor
Other connected devices of feeder ear can not timely consume reflected energy, and the voltage of feeder ear can raise because of charge accumulated, short
As many as 3 times of operating voltage can be exceeded in time.Although the state duration of this overvoltage is very short (general a few tens of milliseconds)
It still is possible to that power supply or other equipment are caused to damage.This just needs in parallel between the power supply terminal of dc motor
Appropriate protective device absorbs reflected energy, clamps reflected voltage.The process of this unnecessary electric energy of consumption is called " off-load ".
At present, a kind of conventional method is packet routing device in parallel, such as TVS pipe or piezo-resistance.This kind of device
The advantages of part is small volume, and fast response time, shortcoming is that absorption energy is small, is easily damaged, it is less to be only applicable to reflected energy
Motor.Typically just Power Resistor is needed to use to carry out off-load when the instantaneous power of motor reflection reaches more than 500W,
Electric power generation unloading resistance is parallel between power supply terminal both positive and negative polarity using electromagnetic relay while stopping to motor.Electromagnetism
The shortcomings that relay has the advantages that through-current capability is strong, and contact voltage drop is small, but obvious is that its magnet coil power consumption is larger, it is necessary to volume
Outer accessory power supply is powered.Also responsiveness is slow compared with electronic device, frequent movement when contact it is easy to aging, environment is fitted
The shortcomings of answering property difference.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of reasonable in design, Simple And Practical and action speed
Spend the discharging circuit of fast direct current generator.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of discharging circuit of direct current generator, including power supply, voltage stabilizing circuit module, over-pressed judge module, electronic cutting
Close module and electric power generation unloading resistance R3；The positive pole of the power supply respectively with voltage stabilizing circuit module, over-pressed judge module, electric power generation unloading resistance
R3 one end and the positive pole of direct current generator are connected；The other end of the electric power generation unloading resistance R3 and one end phase of electronic switch module
Connection；The negative pole of the power supply respectively with the other end of voltage stabilizing circuit module, over-pressed judge module, electronic switch module with
And the negative pole of direct current generator is connected；
One output end of the voltage stabilizing circuit module enters the power supply obtained from dc bus defeated after line translation and voltage stabilizing
Go out to over-pressed judge module, the output of another output end of the Voltage stabilizing module all the way reference voltage signal to over-pressed judge module；
The output end of the over-pressed judge module is connected with electronic switch module, for sending switch order to electronic cutting
Close module.
Moreover, the voltage stabilizing circuit module is by voltage-regulator diode D1, current-limiting resistance R1 and benchmark voltage stabilizing chip IC1 and resistance
Capacitance network forms；The positive pole of the power supply is connected with voltage-regulator diode D1 negative electrode, the anode of the voltage-regulator diode
It is connected with current-limiting resistance R1 one end, the current-limiting resistance R1 other end is connected with voltage stabilizing chip IC1 anode, the voltage stabilizing
The negative electrode of chip IC 1 is connected with power supply negative pole, and voltage stabilizing chip IC1 reference edge is connected with resistance-capacitance network,
Output power supply voltage and reference voltage.
Moreover, the over-pressed judge module is made up of voltage comparator chip and peripheral circuit, the voltage comparator core
Busbar voltage that piece gathers to resistance pressure-dividing network and reference voltage from voltage stabilizing circuit module output are compared, and to electronics
Switch module sends switch command.
Moreover, the electronic switch module is the device for power switching that MOSFET or IGBT or triode are formed.
The advantages and positive effects of the present invention are：
1st, the present invention uses high-power resistance off-load, using MOSFET as electronic switch, the mistake of single comparator composition
Decision circuitry driving electronic switch action is pressed, using the integrated circuit TL431 voltage stabilizings of monolithic, while provides circuit need of work
Accessory power supply and comparator required voltage benchmark.Whole discharging circuit can be integrated in one piece of small circuit in practical application
On plate, it is directly parallel between motor positive-negative power supply terminal, it is not necessary to extra accessory power supply, it is not necessary to judge electronic
The working condition of machine, it is not necessary to which other control signals can normal work.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the present invention；
Fig. 2 is the circuit diagram of the present invention；
Fig. 3 is the reflected voltage waveform diagram of the dc motor of the present invention.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing：
A kind of discharging circuit of direct current generator, as depicted in figs. 1 and 2, including voltage stabilizing circuit module, over-pressed judge module,
Electronic switch module and electric power generation unloading resistance R3；The positive pole of the power supply respectively with voltage stabilizing circuit module, over-pressed judge module, unload
Charged resistance R3 one end and the positive pole of direct current generator are connected；The other end of the electric power generation unloading resistance R3 and electronic switch module
One end is connected；The negative pole of the power supply respectively with voltage stabilizing circuit module, over-pressed judge module, electronic switch module it is another
The negative pole of one end and direct current generator is connected；
One output end of the voltage stabilizing circuit module enters the power supply obtained from dc bus defeated after line translation and voltage stabilizing
Go out to over-pressed judge module, the output of another output end of the Voltage stabilizing module all the way reference voltage signal to over-pressed judge module；
The voltage stabilizing circuit module is by voltage-regulator diode D1, current-limiting resistance R1 and benchmark voltage stabilizing chip IC1 and resistance capacitance
Network forms；The positive pole of the power supply is connected with voltage-regulator diode D1 negative electrode, the anode and limit of the voltage-regulator diode
Leakage resistance R1 one end is connected, and the current-limiting resistance R1 other end is connected with voltage stabilizing chip IC1 anode, the voltage stabilizing chip
IC1 negative electrode is connected with power supply negative pole, and voltage stabilizing chip IC1 reference edge is connected with resistance-capacitance network, output
Working power voltage and reference voltage.
In the present embodiment, the voltage stabilizing circuit module is by voltage-regulator diode D1, current-limiting resistance R1 and benchmark voltage stabilizing chip
IC1 (TL431) and resistance-capacitance network composition；The positive pole of the power supply is connected with voltage-regulator diode D1 negative electrode, should
The anode of voltage-regulator diode is connected with current-limiting resistance R1 one end, and the current-limiting resistance R1 other end is with voltage stabilizing chip IC1's
Anode is connected, and voltage stabilizing chip IC1 negative electrode is connected with power supply negative pole, the voltage stabilizing chip IC1 reference edge and electricity
Resistance capacitance network is connected, and can obtain precision degree by the cooperation voltage stabilizing chip IC1 of resistance-capacitance network is higher than 0.5%
Supply voltage and reference voltage.
The output end of the over-pressed judge module is connected with electronic switch module, for sending switch order to electronic cutting
Close module.
The over-pressed judge module is made up of voltage comparator chip and peripheral circuit, and the voltage comparator chip is to electricity
The busbar voltage of resistance potential-divider network collection and it is compared from the reference voltage of voltage stabilizing circuit module output, and to electronic switch mould
Block sends switch command.
In the present embodiment, the over-pressed judge module is made up of voltage comparator chip and peripheral circuit, for monitoring
Busbar voltage；The over-pressed judge module obtains the supply voltage and reference voltage of itself work from voltage stabilizing circuit module, and passes through
The busbar voltage collected is output to voltage comparator by resistance pressure-dividing network,
The voltage comparator compares the bus voltage signal collected with reference voltage.
In the present embodiment, the electronic switch module is the power switch device that MOSFET or IGBT or triode are formed
Part, for performing the switch order of over-pressed judge module, when receiving the "ON" instruction that over-pressed judge module is sent, power is opened
Break-over of device is closed, path is provided for discharging circuit electric current, is ended when receiving "Off" instruction, cut-out discharging circuit electric current leads to
Road.
In the present embodiment, one end of the electric power generation unloading resistance R3 is connected with the positive pole of direct current generator, for by direct current generator
The reflected energy sent is converted into heat energy；The electric power generation unloading resistance R3 other end is connected with electronic switch module, works as electronic switch
When module turns on, reflected current is flowed through from electric power generation unloading resistance R3, and reflected energy is consumed, and reflected voltage declines.
It is described in detail below for the composition and its function of the modules in the discharging circuit of the present invention：
The effect of Voltage stabilizing module is voltage transformation.Voltage stabilizing module is powered from dc bus, go forward side by side line translation and voltage stabilizing
Stable supply voltage is exported afterwards to use for other circuits, also exports the very high voltage signal of stability all the way and precision, there is provided
To over-pressed judge module.The voltage stabilizing circuit module is by voltage-regulator diode D1, current-limiting resistance R1, voltage stabilizing chip IC1 (TL431) and electricity
Resistance capacitance network forms.TL431 is that special voltage stabilizing chip can obtain precision degree by the cooperation of resistance-capacitance network and be higher than
0.5% supply voltage and reference voltage.Voltage-regulator diode D1 effect is subject to partial pressure, because voltage stabilizing chip TL431 is most
High withstand voltage is 36V, when DC bus-bar voltage is higher than 36V using voltage-stabiliser tube D1 carry out partial pressure decompression, the voltage stabilizing value of voltage-stabiliser tube with
Busbar voltage is relevant.
The effect of over-pressed judge module is monitoring busbar voltage, and sends switch order to electronic switch module.Overvoltage is sentenced
Disconnected module is made up of voltage comparator chip and peripheral circuit.Over-pressed judge module obtains the power supply of itself work from Voltage stabilizing module
Voltage and reference voltage, and the busbar voltage collected is delivered to by voltage comparator by resistance pressure-dividing network.Voltage ratio compared with
Device compares the bus voltage signal collected with reference voltage, and when higher than the unlatching threshold values of setting, voltage comparator is sent
"ON" instructs, and comparator sends "Off" instruction when less than the shut-off threshold values of setting.
The effect of electronic switch module is to perform over-pressed judge module " switch " instruction, equivalent to the lock for unloading charged current
Door.Device for power switching can be that MOSFET or IGBT or triode etc. are fast it is necessary to have switching speed, the drive that control terminal needs
Energy is small, and through-flow energy is strong, these advantages of high pressure.When receiving the "ON" instruction that over-pressed judge module is sent, switch
Break-over of device, path is provided to unload charged current, end when receiving "Off" instruction, cut off off-load current path.
Electric power generation unloading resistance R3 effect is to consume reflected energy, clamper reflected voltage.The reflected energy that direct current generator is sent
It is converted into heat energy.When electronic switch module turns on, reflected current is flowed through from electric power generation unloading resistance, and reflected energy is consumed, reflection electricity
Drops, there is no electric current to be flowed through from electric power generation unloading resistance when electronic switch module is ended, discharging circuit does not produce shadow to busbar voltage
Ring.
A kind of discharging circuit of direct current generator of the present invention realizes the operation principle of off-load, as shown in figure 1, discharging circuit is real
When detect motor positive-negative power supply terminal between magnitude of voltage.When power supply stops to motor, motor inertia operation
Reflected voltage is produced, raises the voltage between positive and negative power supply terminal.Voltage is increased to the unlatching threshold values of discharging circuit setting, unloads
Lotus circuit operation, between electric power generation unloading resistance is parallel into motor positive-negative power supply terminal, reflected energy is by resistance consumption, reflected voltage
Decline, motor speed declines, and is equivalent to generator bringing onto load running status.Reflected voltage drops to the pass of discharging circuit setting
Disconnected threshold values, discharging circuit action, electric power generation unloading resistance is disconnected from the circuit.Now motor is still in coasting, and reflected voltage is again
Secondary to be increased to unlatching threshold values, discharging circuit is again turned on, and repeats above-mentioned unloading process.Until motor speed drops to unloaded electricity
Pressure no longer triggers discharging circuit action.Typically the unlatching threshold values of discharging circuit and shut-off threshold values are all set in higher than operating voltage
Point.Such as the motor that 48V works, open threshold values and may be provided at 60V, shut-off threshold values may be provided at 55V.Phase can so be protected
Powered-down road has not received crushing wound, and does not influence motor and operated in the range of mains ripple, avoids because of mains ripple
Cause maloperation.Reflected voltage is fluctuated between threshold values is switched on and off with the situation of sawtooth like ripple during off-load, and it reflects electricity
Corrugating schematic diagram is as shown in Figure 3.
In the present embodiment, open threshold values to be generally located between the 120%~130% of operating voltage, turn off threshold values one
As be arranged between the 110%~120% of operating voltage.
The voltage stabilizing circuit module of the present invention is by voltage-regulator diode D1, current-limiting resistance R1, voltage stabilizing chip IC1 (TL431) and electricity
Resistance capacitance network forms.
Wherein, zener diode D1 effect is that the voltage that limitation is applied on fiducial chip IC1 is no more than its most senior engineer
Make voltage 36V.Current-limiting resistance R1 effect is to limit fiducial chip IC1 operating current, fiducial chip IC1 maximum functional electricity
Flow for 100mA.
The operating current that each device of estimation discharging circuit needs is：Comparator 5mA, MOSFET driving 20mA, other circuits
Consume 5mA；The operating current of mu balanced circuit can be limited in by 30mA or so by the resistance for adjusting current-limiting resistance R1, make IC1 works
There are enough drop volumes as electric current, and can meets discharging circuit need of work.The ratio for adjusting resistance R6, R8 can be by accessory power supply voltage
VCC is accurately set in 12V.
As shown in Fig. 2 resistance R5, R10, by VCC partial pressures, the reference voltage for forming 5.0V is connected to the reverse defeated of comparator
Enter end.Resistance R2, R9 sample to the voltage between motor positive-negative power supply terminal, forward direction input of the dividing point with comparator
End is connected.The unlatching threshold values of comparator is set by adjusting R2, R9 resistance, when reflected voltage reaches the unlatching threshold values of setting
When (comparator positive input voltage be higher than reverse input end reference voltage when) comparator upset, export high level, apply
MOSFET Q1 grids are added to, Q1 conductings, electric power generation unloading resistance R3 are parallel between the positive and negative terminals of motor.Reflected energy is unloaded
Lotus resistance consumption, reflected voltage decline, until turning off threshold values.Shut-off threshold values can be set by the positive-feedback circuit of comparator
Put, positive-feedback circuit is made up of diode D2 and resistance R4.Before reflected voltage not up to opens threshold values, comparator exports low electricity
Flat, diode D2 reversely ends, and no electric current, feedback circuit do not work on resistance R4, and sample circuit is not had an impact.When
Reflected voltage reaches unlatching threshold values, during comparator output high level, diode D2 forward conductions, has electricity from right to left on resistance R4
Stream flows through, and this electric current changes the original partial pressure relationship of sample circuit, the voltage of comparator positive input is improved one again
A bit；The reflected voltage for so there was only sampled point falls corresponding numerical value after rise, just can arrive the current path of comparator positive input
Below reference voltage, comparator could be overturn as low level state.Q1 gate charges are released when comparator exports low level, Q1
Cut-off, electric power generation unloading resistance R3 are disconnected from the circuit.Operated in motor inertia, Light Condition reflected voltage does not drop to unlatching threshold values
This working condition being switched on and off repeatedly is always maintained at before, and reflected voltage is suppressed in the unlatching threshold values of setting and shut-off
Between threshold values.The shut-off threshold values of discharging circuit can be configured by positive feedback resistor R4, the R4 smaller shut-off voltage valve of resistance
Value is lower.
It is emphasized that embodiment of the present invention is illustrative, rather than it is limited, therefore present invention bag
Include and be not limited to embodiment described in embodiment, it is every by those skilled in the art's technique according to the invention scheme
The other embodiment drawn, also belongs to the scope of protection of the invention.
Claims (4)
- A kind of 1. discharging circuit of direct current generator, it is characterised in that：Judge mould including power supply, voltage stabilizing circuit module, overvoltage Block, electronic switch module and electric power generation unloading resistance R3；The positive pole of the power supply judges mould with voltage stabilizing circuit module, overvoltage respectively The positive pole of block, electric power generation unloading resistance R3 one end and direct current generator is connected；The other end and electronic switch of the electric power generation unloading resistance R3 One end of module is connected；The negative pole of the power supply respectively with voltage stabilizing circuit module, over-pressed judge module, electronic switch mould The other end of block and the negative pole of direct current generator are connected；One output end of the voltage stabilizing circuit module by the power supply obtained from dc bus enter after line translation and voltage stabilizing output to Over-pressed judge module, the output of another output end of the Voltage stabilizing module all the way reference voltage signal to over-pressed judge module；The output end of the over-pressed judge module is connected with electronic switch module, for sending switch order to electronic switch mould Block.
- A kind of 2. discharging circuit of direct current generator according to claim 1, it is characterised in that：The voltage stabilizing circuit module by Voltage-regulator diode D1, current-limiting resistance R1 and benchmark voltage stabilizing chip IC1 and resistance-capacitance network composition；The positive pole of the power supply It is connected with voltage-regulator diode D1 negative electrode, the anode of the voltage-regulator diode is connected with current-limiting resistance R1 one end, the current limliting The resistance R1 other end is connected with voltage stabilizing chip IC1 anode, and voltage stabilizing chip IC1 negative electrode is connected with power supply negative pole Connect, voltage stabilizing chip IC1 reference edge is connected with resistance-capacitance network, output power supply voltage and reference voltage.
- A kind of 3. discharging circuit of direct current generator according to claim 1 or 2, it is characterised in that：The overvoltage judges mould Block is made up of voltage comparator chip and peripheral circuit, the bus electricity that the voltage comparator chip gathers to resistance pressure-dividing network Pressure and the reference voltage exported from voltage stabilizing circuit module are compared, and send switch command to electronic switch module.
- A kind of 4. discharging circuit of direct current generator according to claim 1 or 2, it is characterised in that：The electronic switch mould Block is the device for power switching that MOSFET or IGBT or triode are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978106.2A CN107769675A (en) | 2017-10-18 | 2017-10-18 | A kind of discharging circuit of direct current generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978106.2A CN107769675A (en) | 2017-10-18 | 2017-10-18 | A kind of discharging circuit of direct current generator |
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| Publication Number | Publication Date |
|---|---|
| CN107769675A true CN107769675A (en) | 2018-03-06 |
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ID=61268965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710978106.2A Pending CN107769675A (en) | 2017-10-18 | 2017-10-18 | A kind of discharging circuit of direct current generator |
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| CN (1) | CN107769675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380396A (en) * | 2019-08-19 | 2019-10-25 | 深圳市思榕科技有限公司 | A kind of quick self-adapted counnter attack protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0991177A2 (en) * | 1998-10-02 | 2000-04-05 | Eastman Kodak Company | Method and apparatus for improved electronic braking of a DC motor |
| CN201256282Y (en) * | 2008-08-01 | 2009-06-10 | 研祥智能科技股份有限公司 | High stability output overvoltage protection circuit |
| CN204085726U (en) * | 2014-01-06 | 2015-01-07 | 江苏索尔新能源科技股份有限公司 | A kind of temperature sensing circuit structure |
-
2017
- 2017-10-18 CN CN201710978106.2A patent/CN107769675A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0991177A2 (en) * | 1998-10-02 | 2000-04-05 | Eastman Kodak Company | Method and apparatus for improved electronic braking of a DC motor |
| CN201256282Y (en) * | 2008-08-01 | 2009-06-10 | 研祥智能科技股份有限公司 | High stability output overvoltage protection circuit |
| CN204085726U (en) * | 2014-01-06 | 2015-01-07 | 江苏索尔新能源科技股份有限公司 | A kind of temperature sensing circuit structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380396A (en) * | 2019-08-19 | 2019-10-25 | 深圳市思榕科技有限公司 | A kind of quick self-adapted counnter attack protection circuit |
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Application publication date: 20180306 |
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