CN111800038A - Counter electromotive force detection circuit of brushless motor controller - Google Patents
Counter electromotive force detection circuit of brushless motor controller Download PDFInfo
- Publication number
- CN111800038A CN111800038A CN202010657223.0A CN202010657223A CN111800038A CN 111800038 A CN111800038 A CN 111800038A CN 202010657223 A CN202010657223 A CN 202010657223A CN 111800038 A CN111800038 A CN 111800038A
- Authority
- CN
- China
- Prior art keywords
- control element
- brushless motor
- detection circuit
- electromotive force
- motor controller
- 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.)
- Withdrawn
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a back electromotive force detection circuit of a brushless motor controller, which comprises a controller chip and two back electromotive force detection resistors and is characterized by also comprising a control element, wherein the control element is connected in series between the two back electromotive force detection resistors and is connected with an analog quantity input port of the controller chip; and the control signal of the control element is derived from the signal output after the controller chip is awakened. The invention adopts the mode of adding a control element (MOSFET or IGBT device and the like) for disconnecting the analog quantity detection circuit in the dormant state so as to improve the reliability of the control chip in the dormant state.
Description
Technical Field
The invention relates to the technical field of automobile cooling fans, in particular to a back electromotive force detection circuit of a brushless motor controller.
Background
Most brushless motor controllers for automobile cooling fans need a counter electromotive force detection circuit shown in fig. 1 for detecting a counter electromotive force value to control the operation of the brushless motor, but in a dormant state, the controller chip 1 in the controller is not powered, and if the brushless motor has a rotating speed under the action of external force, a voltage is generated at an analog input port of the controller chip 1, so that the risk of damage to the analog input port UAD of the controller chip 1 may be increased. The back-emf detection resistors R2 and R3 in fig. 1 are connected in series.
At present, most of automobile cooling fan designs do not adopt means for the potential problem, and are mainly guaranteed by the design of a control chip, so that the applicability is poor.
Disclosure of Invention
The present invention provides a counter electromotive force detection circuit of a brushless motor controller, aiming at the disadvantages of the counter electromotive force detection circuit of the brushless motor controller for the cooling fan of the existing automobile, so as to solve the disadvantages of the prior art.
The technical problem to be solved by the invention can be realized by the following technical scheme:
a counter potential detection circuit of a brushless motor controller comprises a controller chip and two counter potential detection resistors and is characterized by further comprising a control element, wherein the control element is connected between the two counter potential detection resistors in series and is connected with an analog quantity input port of the controller chip; and the control signal of the control element is derived from the signal output after the controller chip is awakened.
In a preferred embodiment of the invention, the control element is a MOSFET device or an IGBT device.
In a preferred embodiment of the present invention, when the control element is a MOSFET device, the gate of the control element is connected to the control signal, the source of the control element is connected to one end of a counter-potential detection resistor and the analog input port of the controller chip, the other end of the counter-potential detection resistor is grounded, the drain of the control element is connected to one end of another counter-potential detection resistor, and the other end of the another counter-potential detection resistor is connected to the power supply.
Due to the adoption of the technical scheme, the invention adopts the mode of adding a control element (MOSFET or IGBT device and the like) for disconnecting the analog quantity detection circuit in the dormant state so as to improve the reliability of the control chip in the dormant state.
Drawings
Fig. 1 is an electrical schematic diagram of a counter electromotive force detection circuit of a brushless motor controller for a conventional automotive cooling fan.
Fig. 2 is an electrical schematic diagram of a back emf detection circuit of the brushless motor controller of the present invention.
Detailed Description
The invention is further described below in conjunction with the appended drawings and detailed description.
Referring to fig. 2, the back electromotive force detection circuit of the brushless motor controller shown in the figure comprises a controller chip 1 and two back electromotive force detection resistors R2 and R3, and further comprises a control element Q1, wherein the control element Q1 is a MOSFET device or an IGBT device.
In this embodiment, the control device Q1 is a MOSFET device, the gate S of the control device Q1 is connected to the control signal READY, the control signal READY of the control device Q1 is derived from the signal output after the controller chip 1 wakes up, the source S of the control device Q1 is connected to one end of the counter-potential detection resistor R2 and the analog input port UAD of the controller chip 1, the other end of the counter-potential detection resistor R2 is connected to the GND, the drain D is connected to one end of the counter-potential detection resistor R2, and the other end of the counter-potential detection resistor R2 is connected to the power U.
In the dormant state, the control signal READY is at a low level, the control element Q1 is not turned on, the detection line is disconnected, and when the controller chip 1 is awakened and the control signal READY is at a high level, the switch device Q1 is turned on, and the detection line can work normally.
Claims (3)
1. A counter potential detection circuit of a brushless motor controller comprises a controller chip and two counter potential detection resistors and is characterized by further comprising a control element, wherein the control element is connected between the two counter potential detection resistors in series and is connected with an analog quantity input port of the controller chip; and the control signal of the control element is derived from the signal output after the controller chip is awakened.
2. A brushless motor controller back emf detection circuit as claimed in claim 1, wherein said control element is a MOSFET device or an IGBT device.
3. A counter potential detecting circuit of a brushless motor controller according to claim 2, wherein when said control element is a MOSFET device, a gate thereof is connected to a control signal, a source thereof is connected to one end of a counter potential detecting resistor and an analog input port of said controller chip, the other end of the one counter potential detecting resistor is grounded, a drain thereof is connected to one end of another counter potential detecting resistor, and the other end of the another counter potential detecting resistor is connected to a power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010657223.0A CN111800038A (en) | 2020-07-09 | 2020-07-09 | Counter electromotive force detection circuit of brushless motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010657223.0A CN111800038A (en) | 2020-07-09 | 2020-07-09 | Counter electromotive force detection circuit of brushless motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111800038A true CN111800038A (en) | 2020-10-20 |
Family
ID=72811421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010657223.0A Withdrawn CN111800038A (en) | 2020-07-09 | 2020-07-09 | Counter electromotive force detection circuit of brushless motor controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111800038A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909311A (en) * | 2021-02-07 | 2022-08-16 | 广州汽车集团股份有限公司 | Fan and engine cooling system |
-
2020
- 2020-07-09 CN CN202010657223.0A patent/CN111800038A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909311A (en) * | 2021-02-07 | 2022-08-16 | 广州汽车集团股份有限公司 | Fan and engine cooling system |
| CN114909311B (en) * | 2021-02-07 | 2024-04-23 | 广州汽车集团股份有限公司 | Fan and engine cooling system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201020 |