CN206602355U - Current foldback circuit for brshless DC motor driving chip efferent duct - Google Patents
Current foldback circuit for brshless DC motor driving chip efferent duct Download PDFInfo
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- CN206602355U CN206602355U CN201720322110.9U CN201720322110U CN206602355U CN 206602355 U CN206602355 U CN 206602355U CN 201720322110 U CN201720322110 U CN 201720322110U CN 206602355 U CN206602355 U CN 206602355U
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- transistor
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- efferent duct
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Abstract
The utility model is related to brshless DC motor driving chip current foldback circuit technical field, specifically, is related to a kind of current foldback circuit for brshless DC motor driving chip efferent duct.It includes chip output transistor, transmission transistor and controlling transistor, transmission transistor is used to transmit the saturation voltage drop of chip output transistor as sampled voltage to a comparator, comparator is used to after saturation voltage drop is compared with a bias voltage be controlled the grid voltage of controlling transistor, and controlling transistor is used to be controlled the grid voltage of chip output transistor.The utility model preferably can carry out overcurrent protection to the driving chip of brshless DC motor.
Description
Technical field
The utility model is related to brshless DC motor driving chip current foldback circuit technical field, specifically, is related to
A kind of current foldback circuit for brshless DC motor driving chip efferent duct.
Background technology
Brshless DC motor grows up on the basis of brushed DC motor, due to its have fast response time,
Degree of regulation is high, it is easy to maintain the advantages of, thus be widely used in multiple technical fields.With continuing to develop for technology, nothing
The electric current of brushless motor driving chip is increasing, in order to protect driving chip, it is existing it is general can driving chip output
Guan Jiayi current foldback circuit, the high current to protect driving chip efferent duct not flowed through is burnt.
As shown in figure 1, being a kind of current foldback circuit for brshless DC motor driving chip efferent duct.With reference to Fig. 1,
It is additionally arranged a redundancy efferent duct M1 on the basis of chip efferent duct M0, and control signal inputs to chip efferent duct M0 simultaneously
With redundancy efferent duct M1, it is and proportional and cause stream by design chips efferent duct M0 and redundancy efferent duct M1 size
Redundancy efferent duct M1 and chip efferent duct M0 current ratio is crossed into 1：N；In addition, the source electrode in redundancy efferent duct M1 sets one to adopt
Sample resistance R, so as to obtain sampled voltage V1 and export positive terminal to a comparator, the end of oppisite phase of the comparator sets one to bias
Voltage Vref, the output end of the comparator be used to controlling a control pipe M2 conducting whether, control pipe M2 is connected to chip output
Between pipe M0 grid and earth terminal；Designed by this kind so that when the electric current NI at chip efferent duct M0 is excessive, redundancy is defeated
Electric current I is also corresponding larger at outlet pipe M1, so that sampled voltage V1 is also larger, when sampled voltage V1 is more than bias voltage Vref,
Comparator is output as high and controls control pipe M2 to turn on, and now chip efferent duct M0 grid voltage is pulled low, so that by closing
Electric current at disconnected chip efferent duct M0 and realize overcurrent protection function.
But there is problems with a kind of above-mentioned circuit design：1st, it is difficult regulation chip efferent duct M0 and redundancy efferent duct
M1 size, it is N to make to flow through their current ratio：1, so that the device discreteness at made place is larger；2nd, sampling resistor R
Discreteness is also larger.So this kind design is difficult that overcurrent protection threshold value is more accurately set.
Utility model content
Content of the present utility model is to provide a kind of overcurrent protection electricity for brshless DC motor driving chip efferent duct
Road, it can overcome certain or some defects of prior art.
According to the current foldback circuit of the present utility model for brshless DC motor driving chip efferent duct, it includes core
Piece output transistor, transmission transistor and controlling transistor, transmission transistor are used for the saturation voltage drop of chip output transistor
Transmitted as sampled voltage to a comparator, comparator is used for after being compared saturation voltage drop and a bias voltage to control
The grid voltage of transistor is controlled, and controlling transistor is used to be controlled the grid voltage of chip output transistor.
In the utility model, sampled voltage is used as by the saturation voltage drop of direct acquisition chip output transistor, can be saved
Sampling resistor and redundancy efferent duct are removed, so as to preferably control overcurrent protection threshold value, is preferably avoided because device is discrete
Influence of the type to overcurrent protection threshold value.
Preferably, the grid of chip output transistor and transmission transistor is used to incoming control signal, chip output
The grid of transistor also accesses earth terminal by controlling transistor.
Preferably, the grid of chip output transistor and transmission transistor is believed by different phase inverter Access Controls
Number.
Preferably, chip output transistor, transmission transistor and controlling transistor use NMOS tube, transmission transistor
Drain electrode be connected with the drain electrode of chip output transistor, the positive terminal of the source electrode of transmission transistor and comparator is connected, comparator
End of oppisite phase access bias voltage, the grid of the output end Access Control transistor of comparator, the drain electrode of controlling transistor and core
The source electrode of the grid connection of piece output transistor, controlling transistor and chip output transistor accesses earth terminal, control signal
While the grid of access chip output transistor and transmission transistor.
Brief description of the drawings
Fig. 1 is the schematic diagram of the brshless DC motor driving chip current foldback circuit using redundancy efferent duct；
Fig. 2 be embodiment 1 in the current foldback circuit for brshless DC motor driving chip efferent duct schematic diagram.
Embodiment
To further appreciate that content of the present utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.
It should be appreciated that embodiment be only the utility model is explained and and it is non-limiting.
Embodiment 1
As shown in Fig. 2 present embodiments providing a kind of overcurrent protection for brshless DC motor driving chip efferent duct
Circuit, it includes chip output transistor M0, transmission transistor M2 and controlling transistor M3, and transmission transistor M2 is used for chip
Output transistor M0 saturation voltage drop V0 is transmitted to a comparator U0 as sampled voltage, and comparator U0 is used for saturation voltage drop
V0 is controlled after being compared with a bias voltage Vref to controlling transistor M3 grid voltage, and controlling transistor M3 is used for
Chip output transistor M0 grid voltage is controlled.
In the present embodiment, chip output transistor M0 and transmission transistor M2 grid are used to incoming control signal clt,
Chip output transistor M0 grid also accesses earth terminal GND by controlling transistor M3.Chip output transistor M0 and transmission
Transistor M2 grid passes through different phase inverter I1 and I2 incoming control signal clt.
In the present embodiment, chip output transistor M0, transmission transistor M2 and controlling transistor M3 use NMOS tube, pass
Defeated transistor M2 drain electrode is connected with chip output transistor M0 drain electrode, and transmission transistor M2 source electrode and comparator U0 are just
Phase end is connected, comparator U0 end of oppisite phase access bias voltage Vref, comparator U0 output end Access Control transistor M3's
Grid, controlling transistor M3 drain electrode is connected with chip output transistor M0 grid, and controlling transistor M3 and chip output are brilliant
Body pipe M0 source electrode accesses earth terminal GND, control signal clt while access chip output transistor M0 and transmission transistor M2
Grid.
The operation principle of current foldback circuit in the present embodiment is as follows：Motor drive ic current load is exported in chip
Transistor M0 drain electrode, transmission transistor M2 transmits output transistor M0 saturation voltage drop V0 to comparator U0 positive terminal,
Because being provided with bias voltage Vref (bias voltage Vref size is overcurrent protection threshold size) at comparator U0 end of oppisite phase,
Therefore when saturation voltage drop V0 is more than bias voltage Vref, comparator U0 is output as just so that controlling transistor M3 is turned on；This
When, output transistor M0 grid voltage is pulled low, so that output transistor M0 is turned off, so as to effectively to output
Transistor M0 carries out overcurrent protection.
In addition, control signal clt can also be while the break-make to output transistor M0 and transmission transistor M2 be controlled.
Schematically the utility model and embodiments thereof are described above, the description does not have restricted, accompanying drawing
Shown in be also one of embodiment of the present utility model, actual structure is not limited thereto.So, if this area
Those of ordinary skill enlightened by it, do not departing from the case that the utility model creates objective, designed without creative
The frame mode similar to the technical scheme and embodiment, all should belong to protection domain of the present utility model.
Claims (4)
1. the current foldback circuit for brshless DC motor driving chip efferent duct, it is characterised in that：Export brilliant including chip
Body pipe (M0), transmission transistor (M2) and controlling transistor (M3), transmission transistor (M2) are used for chip output transistor
(M0) saturation voltage drop (V0) is transmitted to a comparator (U0) place as sampled voltage, and comparator (U0) is used for saturation voltage drop
(V0) grid voltage of controlling transistor (M3) is controlled after being compared with a bias voltage (Vref), controlling transistor
(M3) it is used to be controlled the grid voltage of chip output transistor (M0).
2. the current foldback circuit according to claim 1 for brshless DC motor driving chip efferent duct, its feature
It is：The grid of chip output transistor (M0) and transmission transistor (M2) is used to incoming control signal (clt), chip output
The grid of transistor (M0) also accesses earth terminal (GND) by controlling transistor (M3).
3. the current foldback circuit according to claim 2 for brshless DC motor driving chip efferent duct, its feature
It is：The grid of chip output transistor (M0) and transmission transistor (M2) passes through different phase inverter incoming control signals
(clt)。
4. the current foldback circuit according to claim 2 for brshless DC motor driving chip efferent duct, its feature
It is：Chip output transistor (M0), transmission transistor (M2) and controlling transistor (M3) use NMOS tube, transmission transistor
(M2) drain electrode is connected with the drain electrode of chip output transistor (M0), and the source electrode and comparator (U0) of transmission transistor (M2) are just
Phase end is connected, the end of oppisite phase access bias voltage (Vref) of comparator (U0), the output end Access Control crystal of comparator (U0)
The grid of (M3) is managed, the drain electrode of controlling transistor (M3) is connected with the grid of chip output transistor (M0), controlling transistor
(M3) and chip output transistor (M0) source electrode access earth terminal (GND), control signal (clt) and meanwhile access chip export
The grid of transistor (M0) and transmission transistor (M2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720322110.9U CN206602355U (en) | 2017-03-30 | 2017-03-30 | Current foldback circuit for brshless DC motor driving chip efferent duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720322110.9U CN206602355U (en) | 2017-03-30 | 2017-03-30 | Current foldback circuit for brshless DC motor driving chip efferent duct |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206602355U true CN206602355U (en) | 2017-10-31 |
Family
ID=60144487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720322110.9U Active CN206602355U (en) | 2017-03-30 | 2017-03-30 | Current foldback circuit for brshless DC motor driving chip efferent duct |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206602355U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079260A (en) * | 2020-08-17 | 2022-02-22 | 浙江海利普电子科技有限公司 | Fan protection circuit |
-
2017
- 2017-03-30 CN CN201720322110.9U patent/CN206602355U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079260A (en) * | 2020-08-17 | 2022-02-22 | 浙江海利普电子科技有限公司 | Fan protection circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 1210-11, 198 Wudong Road, Yangpu District, Shanghai 200082 Patentee after: Shanghai Xinyan Microelectronics Co.,Ltd. Address before: Room 1210-11, 198 Wudong Road, Yangpu District, Shanghai 200082 Patentee before: GOCHIP ELECTRONICS TECHNOLOGY CO.,LTD. |