CN205792329U - Direct current motor drive circuit with current limiting - Google Patents
Direct current motor drive circuit with current limiting Download PDFInfo
- Publication number
- CN205792329U CN205792329U CN201620560024.7U CN201620560024U CN205792329U CN 205792329 U CN205792329 U CN 205792329U CN 201620560024 U CN201620560024 U CN 201620560024U CN 205792329 U CN205792329 U CN 205792329U
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- CN
- China
- Prior art keywords
- resistance
- nmos tube
- npn type
- power nmos
- motor
- Prior art date
- 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.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
- Motor And Converter Starters (AREA)
Abstract
The utility model discloses the direct current motor drive circuit of a kind of band current limiting, including switch K, resistance R1, resistance R2, resistance R3, NPN type triode Q2, power NMOS tube Q1 and motor M.The beneficial effects of the utility model are: during electric motor starting, starting current is carried out current limliting, it is to avoid impact to power supply VCC；It is also prevented from when motor rotation blockage causing power NMOS tube to cross thermally-induced damage owing to electric current is excessive simultaneously.
Description
Technical field
This utility model relates to machine field, refers more particularly to the direct current motor drive circuit of band current limiting.
Background technology
Being illustrated in figure 1 the circuit diagram of the direct current motor drive circuit of prior art, when switching K and closing, power supply VCC leads to
Cross R2 and R3 dividing potential drop and obtain the grid voltage of power NMOS tube Q1, during electric motor starting, have big electric current, had stream and start electricity
Source VCC impacts.
Summary of the invention
This utility model aims to solve the problem that the deficiencies in the prior art, it is provided that starting current can be entered by one when electric motor starting
Row current limliting, it is to avoid impact to power supply VCC；It is also prevented from when motor rotation blockage causing power owing to electric current is excessive simultaneously
NMOS tube crosses thermally-induced damage.
With the direct current motor drive circuit of current limiting, including switch K, resistance R1, resistance R2, resistance R3, NPN type triode
Q2, power NMOS tube Q1 and motor M:
The one termination power VCC of described switch K, another terminates one end of described resistance R2；
The one termination base stage of described NPN type triode Q2 of described resistance R1 and the source electrode of described power NMOS tube Q1 and lining
The end, other end ground connection；
One end of the one described switch K of termination of described resistance R2, another one end terminating described resistance R3 and described NPN type
The colelctor electrode of audion Q2 and the grid of described power NMOS tube Q1；
One end meeting described resistance R2 of described resistance R3 and the colelctor electrode of described NPN type triode Q2 and described power
The grid of NMOS tube Q1, other end ground connection；
The base stage of described NPN type triode Q2 connects source electrode and the substrate and the one of described resistance R1 of described power NMOS tube Q1
End, colelctor electrode connects one end of described resistance R2 and one end of described resistance R3 and the grid of described power NMOS tube Q1, emitter stage
Ground connection；
The grid of described power NMOS tube Q1 connects one end of described resistance R2 and one end of described resistance R3 and described NPN type
The colelctor electrode of audion Q2, drain electrode connects the negative pole of described motor M, and source electrode and substrate are connected together and connect described NPN type triode again
The base stage of Q2 and one end of described resistance R1；
The positive pole of described motor M meets power supply VCC, and negative pole connects the drain electrode of described power NMOS tube Q1.
Also described resistance R1 is flow through, when starting current is excessive at described resistance R1 by the electric current of motor during electric motor starting
The voltage produced makes this voltage can reach the conducting of described NPN type triode Q2, the grid electricity of the most described power NMOS tube Q1
Pressure can drag down, and then the electric current flowing through described power NMOS tube Q1 is reduced, and the voltage drop of the most described resistance R1 also reduces,
The most described NPN type triode Q2 is closed, and described power NMOS tube Q1 returns to normal condition；The most repeatedly, allow for driving electricity
Dynamo-electric stream was limited in normal range.
When motor generation stall, driving electric current to increase, the pressure drop at described resistance R1 increases considerably, and at this moment can make institute
State the conducting of NPN type triode Q2 the grid voltage of described power NMOS tube Q1 dragged down to even result in described power NMOS tube Q1 pass
Close, thus avoid power NMOS tube Q1 and damage owing to big electric current causes overheated.
Can also by the emitter stage of described NPN type triode Q2 connect a resistance to ground, so can by regulation should
Resistance regulates the scope maximum driving electric current by described power NMOS tube Q1.
To sum up, the beneficial effects of the utility model are: during electric motor starting, starting current is carried out current limliting, it is to avoid to electricity
The impact of source VCC；It is also prevented from when motor rotation blockage causing power NMOS tube to cross thermally-induced damage owing to electric current is excessive simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the DC motor Driver of prior art.
Fig. 2 is the circuit diagram of the direct current motor drive circuit of band current limiting of the present utility model.
Fig. 3 is the circuit diagram of another example of the direct current motor drive circuit of band current limiting of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model content is further illustrated.
With the direct current motor drive circuit of current limiting, as in figure 2 it is shown, include switch K, resistance R1, resistance R2, resistance R3,
NPN type triode Q2, power NMOS tube Q1 and motor M:
The one termination power VCC of described switch K, another terminates one end of described resistance R2；
The one termination base stage of described NPN type triode Q2 of described resistance R1 and the source electrode of described power NMOS tube Q1 and lining
The end, other end ground connection；
One end of the one described switch K of termination of described resistance R2, another one end terminating described resistance R3 and described NPN type
The colelctor electrode of audion Q2 and the grid of described power NMOS tube Q1；
One end meeting described resistance R2 of described resistance R3 and the colelctor electrode of described NPN type triode Q2 and described power
The grid of NMOS tube Q1, other end ground connection；
The base stage of described NPN type triode Q2 connects source electrode and the substrate and the one of described resistance R1 of described power NMOS tube Q1
End, colelctor electrode connects one end of described resistance R2 and one end of described resistance R3 and the grid of described power NMOS tube Q1, emitter stage
Ground connection；
The grid of described power NMOS tube Q1 connects one end of described resistance R2 and one end of described resistance R3 and described NPN type
The colelctor electrode of audion Q2, drain electrode connects the negative pole of described motor M, and source electrode and substrate are connected together and connect described NPN type triode again
The base stage of Q2 and one end of described resistance R1；
The positive pole of described motor M meets power supply VCC, and negative pole connects the drain electrode of described power NMOS tube Q1.
Also described resistance R1 is flow through, when starting current is excessive at described resistance R1 by the electric current of motor during electric motor starting
The voltage produced makes this voltage can reach the conducting of described NPN type triode Q2, the grid electricity of the most described power NMOS tube Q1
Pressure can drag down, and then the electric current flowing through described power NMOS tube Q1 is reduced, and the voltage drop of the most described resistance R1 also reduces,
The most described NPN type triode Q2 is closed, and described power NMOS tube Q1 returns to normal condition；The most repeatedly, allow for driving electricity
Dynamo-electric stream was limited in normal range.
When motor generation stall, driving electric current to increase, the pressure drop at described resistance R1 increases considerably, and at this moment can make institute
State the conducting of NPN type triode Q2 the grid voltage of described power NMOS tube Q1 dragged down to even result in described power NMOS tube Q1 pass
Close, thus avoid power NMOS tube Q1 and damage owing to big electric current causes overheated.
As shown in Figure 3, it is also possible to by the emitter stage of described NPN type triode Q2 connect a resistance to ground, the most permissible
The scope maximum driving electric current by described power NMOS tube Q1 is regulated by regulating this resistance.
Claims (1)
1. the direct current motor drive circuit of band current limiting, it is characterised in that: include switch K, resistance R1, resistance R2, resistance R3,
NPN type triode Q2, power NMOS tube Q1 and motor M；
The one termination power VCC of described switch K, another terminates one end of described resistance R2；
The one termination base stage of described NPN type triode Q2 of described resistance R1 and the source electrode of described power NMOS tube Q1 and substrate,
Other end ground connection；
One end of the one described switch K of termination of described resistance R2, another one end terminating described resistance R3 and described NPN type three pole
The colelctor electrode of pipe Q2 and the grid of described power NMOS tube Q1；
One end meeting described resistance R2 of described resistance R3 and the colelctor electrode of described NPN type triode Q2 and described power NMOS tube
The grid of Q1, other end ground connection；
The base stage of described NPN type triode Q2 connects the source electrode of described power NMOS tube Q1 and substrate and one end of described resistance R1,
Colelctor electrode connects one end of described resistance R2 and one end of described resistance R3 and the grid of described power NMOS tube Q1, and emitter stage connects
Ground；
The grid of described power NMOS tube Q1 connects one end of described resistance R2 and one end of described resistance R3 and described NPN type three pole
The colelctor electrode of pipe Q2, drain electrode connects the negative pole of described motor M, and source electrode and substrate are connected together and connect described NPN type triode Q2 again
Base stage and one end of described resistance R1；
The positive pole of described motor M meets power supply VCC, and negative pole connects the drain electrode of described power NMOS tube Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620560024.7U CN205792329U (en) | 2016-06-08 | 2016-06-08 | Direct current motor drive circuit with current limiting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620560024.7U CN205792329U (en) | 2016-06-08 | 2016-06-08 | Direct current motor drive circuit with current limiting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205792329U true CN205792329U (en) | 2016-12-07 |
Family
ID=58135354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620560024.7U Expired - Fee Related CN205792329U (en) | 2016-06-08 | 2016-06-08 | Direct current motor drive circuit with current limiting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205792329U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661457A (en) * | 2018-06-29 | 2020-01-07 | 贺德精密有限公司 | DC motor control device |
-
2016
- 2016-06-08 CN CN201620560024.7U patent/CN205792329U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661457A (en) * | 2018-06-29 | 2020-01-07 | 贺德精密有限公司 | DC motor control device |
| CN110661457B (en) * | 2018-06-29 | 2021-09-21 | 贺德精密有限公司 | DC motor control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 Termination date: 20170608 |