CN110620374A - Regenerated electromotive force relief device - Google Patents
Regenerated electromotive force relief device Download PDFInfo
- Publication number
- CN110620374A CN110620374A CN201910967291.4A CN201910967291A CN110620374A CN 110620374 A CN110620374 A CN 110620374A CN 201910967291 A CN201910967291 A CN 201910967291A CN 110620374 A CN110620374 A CN 110620374A
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- Prior art keywords
- resistor
- circuit
- voltage
- bleeder
- triode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16519—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using FET's
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The invention discloses a regenerative electromotive force relief device. It includes: the voltage detection circuit is used for sampling and obtaining a voltage value on the direct current bus; the microcontroller is used for acquiring the voltage value and is provided with at least one output end for outputting a corresponding level signal according to the voltage value and the voltage threshold value; the driving circuit is used for providing a corresponding driving signal to drive the MOS tube to be conducted or cut off according to the level signal; the switching circuit is arranged on the direct current bus and is switched on or switched off under the control of the driving circuit; the bleeder circuit is connected to the direct current bus and used for discharging electromotive force to protect the motor inverter circuit when the switch circuit is switched on; and the self-checking circuit is connected with the direct current bus and used for detecting whether the bleeder circuit works normally or not.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a regenerative electromotive force relief device.
Background
Currently, in industrial applications, a switching power supply is generally used to supply power to a dc driver. But the switching power supply is very sensitive to inductive loads, such as acceleration and deceleration movements of the motor.
After the output voltage of the switching power supply is reversely pumped up by the regenerative electromotive force generated by the acceleration and deceleration movement of the motor, overvoltage protection is easily generated inside the switching power supply or a driving chip inside the switching power supply is restarted after power failure. In extreme cases, the power supply may also be damaged directly, resulting in the system not operating properly.
In order to ensure the normal operation of the switching power supply, an overvoltage leakage protection circuit is usually provided. However, the existing overvoltage leakage protection circuit mostly adopts hardware leakage control with a fixed threshold value, and has a series of defects that the leakage threshold value is not adjustable, the leakage loop cannot be detected automatically, and the like.
Therefore, it is desirable to provide a suitable overvoltage detection and relief device to adequately meet the actual demands of the motor during use.
Disclosure of Invention
The invention aims to provide a regenerative electromotive force relief device which can solve one or more problems of overvoltage detection in the prior art.
In a first aspect, embodiments of the present invention provide a regenerative electromotive force relief device. The regenerative electromotive force relief device includes:
the voltage detection circuit is used for sampling and obtaining a voltage value on the direct current bus;
the microcontroller is connected with the voltage detection circuit and is used for acquiring the voltage value; the microcontroller stores a preset voltage threshold and is provided with at least one output end;
the output end is used for outputting a corresponding level signal according to the voltage value and the voltage threshold value;
the driving circuit is used for providing a corresponding driving signal to drive the MOS tube to be conducted or cut off according to the level signal;
the switching circuit comprises at least one MOS tube and is arranged on the direct current bus; the control end of the switch circuit is connected with the drive circuit and is switched on or switched off under the control of the drive circuit;
the bleeder circuit is connected to the direct current bus and used for discharging electromotive force to protect the motor inverter circuit when the switch circuit is switched on;
and the self-checking circuit is connected with the direct current bus and used for detecting whether the bleeder circuit works normally or not.
Further, the voltage detection circuit includes: a first voltage dividing resistor and a second voltage dividing resistor; the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series on the direct current bus, and a voltage sampling point of the voltage detection circuit is formed between the first voltage-dividing resistor and the second voltage-dividing resistor.
Further, the microcontroller outputs a high level signal at the output end when the voltage value is greater than the voltage threshold value; and the microcontroller outputs a low level signal at the output end when the voltage value is smaller than the voltage threshold value.
Further, the driving circuit includes: the first triode, the second triode, the third triode, the first diode and the first to the sixth resistors;
the base electrode of the first triode is connected with the output end through a second resistor, and the base electrode of the first triode is grounded through the second resistor and the first resistor; the emitter of the first triode is grounded through a fourth resistor;
the collector of the first triode is connected with the base of the second triode, the emitter of the second triode is connected with direct-current voltage, and the base and the emitter of the second triode are also connected through a third resistor;
the collector electrode of the second triode is connected with the emitter electrode of the third triode through a first diode and a sixth resistor, and is grounded through a fifth resistor and connected with the base electrode of the third triode; and the emitter of the third triode is grounded.
Further, the bleeder circuit comprises a second diode and a bleeder resistor; the second diode is reversely connected to the direct current bus, and the bleeder resistor is bridged to the second diode and used for bleeding regenerative electromotive force.
Further, the switch circuit is an MOS tube; and the source electrode and the drain electrode of the MOS tube are connected to the direct current bus, and the grid electrode of the MOS tube is connected with the driving circuit and is switched on or switched off under the control of the driving circuit.
Further, when the MOS tube is conducted, the bleeder resistor is used for discharging regenerative electromotive force; when the MOS tube is cut off, no current flows through the bleeder resistor.
Further, the self-checking circuit comprises an eighth resistor and a ninth resistor; one end of the eighth resistor is connected with the source electrode of the MOS tube, and the other end of the eighth resistor is connected with one end of the ninth resistor; the other end of the ninth resistor is connected with the drain electrode of the MOS tube; and a self-checking sampling point is formed between the eighth resistor and the ninth resistor.
Further, when the driving circuit receives a high level signal, judging whether the level of the self-checking sampling point is a low level; if so, determining that the bleeder circuit works normally; if not, determining that the bleeder circuit works abnormally.
Further, when the driving circuit receives a low level signal, judging whether the level of the self-checking sampling point is a high level; if so, determining that the bleeder circuit works normally; if not, determining that the bleeder circuit works abnormally.
The regenerative electromotive force relief device provided by the embodiment of the invention can effectively solve the problem of power failure caused by poor relief effect of the low-voltage gate controller through reasonable circuit structure design, has the self-checking function of the relief loop, and can further improve the use reliability of equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a functional block diagram of a regenerative electromotive force bleeder device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a voltage detection circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a driving circuit according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a control logic of the regenerative electromotive force bleeder device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a diagram illustrating a regenerative electromotive force bleeder device according to an embodiment of the present invention. The regenerative electromotive force relief device includes: a voltage detection circuit 11, a microcontroller 12, a drive circuit 13, a switching circuit 14, a bleeding circuit 15 and a self-test circuit 16.
The voltage detection circuit 11 is used for sampling and obtaining a voltage value on the direct current bus. The microcontroller 12 is connected to the voltage detection circuit 11, and is configured to obtain the voltage value.
The microcontroller 12 stores a predetermined voltage threshold and has at least one output. The microcontroller 12 can output a corresponding level signal at an output depending on the comparison between the voltage value and the voltage threshold value.
The driving circuit 13 is connected to an output end of the microcontroller 12, and is configured to provide a corresponding driving signal to drive the MOS transistor to be turned on or off according to the level signal. The switching circuit 14 includes at least one MOS transistor, and is disposed on the dc bus.
The control terminal of the switching circuit 14 is connected to the driving circuit, and is switched between an on state and an off state under the control of the driving circuit.
The bleeder circuit 15 is connected to the dc bus and is used for bleeding off electromotive force to protect the motor inverter circuit when the switching circuit is turned on. The self-test circuit 16 is also connected to the dc bus. It can form corresponding detection sampling point for detecting whether the bleeder circuit works normally.
Fig. 2 is a schematic structural diagram of a voltage detection circuit according to an embodiment of the present invention. As shown in fig. 2, the voltage detection circuit may include: a first divider resistor R1 and a second divider resistor R2.
The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series to the DC bus, and a voltage sampling point Vbus _ AD of the voltage detection circuit is formed between the first voltage-dividing resistor and the second voltage-dividing resistor. The voltage detection circuit realizes real-time sampling of the voltage value of the direct current bus in a resistor voltage division mode.
Specifically, the microcontroller outputs a high level signal at the output terminal when the voltage value Vbus _ AD is greater than the voltage threshold value Vset, and outputs a low level signal at the output terminal when the voltage value Vbus _ AD is less than the voltage threshold value.
Fig. 3 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention. As shown in fig. 3, the driving circuit includes: the circuit comprises a first triode Q1, a second triode Q2, a third triode Q3, a first diode D1 and first to sixth resistors R1-R6.
The base of the first triode Q1 is connected with the output end through a second resistor R2, and the base of the first triode is grounded through a second resistor R2 and a first resistor R1. The emitter of the first triode is grounded through a fourth resistor R4.
The collector of the first triode Q1 is connected with the base of the second triode, the emitter of the second triode Q2 is connected with direct current voltage, and the base and the emitter of the second triode Q2 are also connected through a third resistor R3.
The collector of the second triode Q2 is connected with the emitter of the third triode through a first diode D1 and a sixth resistor R6, the collector of the second triode is also connected with the ground through a fifth resistor R5, and is connected with the base of the third triode Q3; the emitter of the third transistor Q3 is grounded.
With continued reference to fig. 3, the bleeding circuit may include: a second diode D2 and a bleed resistor R7. The second diode D2 is reversely connected to the dc bus, and the bleeder resistor R7 is connected across the second diode for bleeding off regenerative electromotive force.
The switching circuit is a MOS transistor Q4, and the source electrode and the drain electrode of the MOS transistor Q4 are connected to the direct current bus. And the grid electrode of the MOS tube is connected with the driving circuit and is switched between a conducting state and a cut-off state under the control of the driving circuit.
As shown in fig. 3, when the MOS transistor is turned on, the bleeder resistor discharges regenerative electromotive force to protect the motor inverter circuit. And when the MOS tube is cut off, no current flows through the bleeder resistor.
With continued reference to fig. 3, the self-test circuit includes: an eighth resistor R8 and a ninth resistor R9.
One end of the eighth resistor R8 is connected with the source of the MOS transistor, and the other end of the eighth resistor R8 is connected with one end of the ninth resistor R9; the other end of the ninth resistor is connected with the drain electrode of the MOS tube; and a self-checking sampling point Check is formed between the eighth resistor and the ninth resistor.
Fig. 4 is a schematic logic determination flow diagram of a self-test circuit according to an embodiment of the present invention. As shown in fig. 4, when the above circuit structure is adopted, it may be determined whether the voltage value is greater than a preset threshold value first. If yes, a high level signal is provided for the driving circuit, the triode and the MOS tube are conducted in sequence, and therefore the regenerative electromotive force is released. If not, a low level signal is provided for the driving circuit, the MOS tube is cut off, and the discharging of the regeneration electromotive force is not needed.
Further, when the driving circuit receives a high level signal, whether the level of the self-checking sampling point is a low level is judged; if so, determining that the bleeder circuit works normally; if not, determining that the bleeder circuit works abnormally.
When the driving circuit receives a low level signal, judging whether the level of the self-checking sampling point is a high level; if so, determining that the bleeder circuit works normally; if not, determining that the bleeder circuit works abnormally.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The use of the phrase "including a" does not exclude the presence of other, identical elements in a process, method, article, or apparatus that comprises the same element, unless the context clearly dictates otherwise.
Claims (10)
1. A regenerative electromotive force relief device, characterized by comprising:
the voltage detection circuit is used for sampling and obtaining a voltage value on the direct current bus;
the microcontroller is connected with the voltage detection circuit and is used for acquiring the voltage value; the microcontroller stores a preset voltage threshold and is provided with at least one output end;
the output end is used for outputting a corresponding level signal according to the voltage value and the voltage threshold value;
the driving circuit is used for providing a corresponding driving signal to drive the MOS tube to be conducted or cut off according to the level signal;
the switching circuit comprises at least one MOS tube and is arranged on the direct current bus: the control end of the switch circuit is connected with the drive circuit and is switched on or switched off under the control of the drive circuit;
the bleeder circuit is connected to the direct current bus and used for discharging electromotive force to protect the motor inverter circuit when the switch circuit is switched on;
and the self-checking circuit is connected with the direct current bus and used for detecting whether the bleeder circuit works normally or not.
2. The regenerative electromotive force bleeder device according to claim 1, wherein the voltage detection circuit comprises: a first voltage dividing resistor and a second voltage dividing resistor;
the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series on the direct current bus, and a voltage sampling point of the voltage detection circuit is formed between the first voltage-dividing resistor and the second voltage-dividing resistor.
3. The regenerative electromotive force bleeder device according to claim 1, wherein said microcontroller outputs a high level signal at said output terminal when said voltage value is greater than said voltage threshold value; and the microcontroller outputs a low level signal at the output end when the voltage value is smaller than the voltage threshold value.
4. The regenerative electromotive force bleeder device according to claim 3, wherein the drive circuit comprises: the first triode, the second triode, the third triode, the first diode and the first to the sixth resistors;
the base electrode of the first triode is connected with the output end through a second resistor, and the base electrode of the first triode is grounded through the second resistor and the first resistor; the emitter of the first triode is grounded through a fourth resistor;
the collector of the first triode is connected with the base of the second triode, the emitter of the second triode is connected with direct-current voltage, and the base and the emitter of the second triode are also connected through a third resistor;
the collector electrode of the second triode is connected with the emitter electrode of the third triode through a first diode and a sixth resistor, and is grounded through a fifth resistor and connected with the base electrode of the third triode; and the emitter of the third triode is grounded.
5. The regenerative electromotive force bleeder device according to claim 4, wherein the bleeder circuit comprises a second diode and a bleeder resistor;
the second diode is reversely connected to the direct current bus, and the bleeder resistor is bridged to the second diode and used for bleeding regenerative electromotive force.
6. The regenerative electromotive force bleeder device according to claim 5, wherein the switching circuit is an MOS transistor;
and the source electrode and the drain electrode of the MOS tube are connected to the direct current bus, and the grid electrode of the MOS tube is connected with the driving circuit and is switched on or switched off under the control of the driving circuit.
7. The regenerative electromotive force bleeder device according to claim 6, wherein the bleeder resistor bleeds the regenerative electromotive force when the MOS transistor is turned on; when the MOS tube is cut off, no current flows through the bleeder resistor.
8. The regenerative electromotive force bleeder device according to claim 7, wherein the self-test circuit comprises an eighth resistor and a ninth resistor;
one end of the eighth resistor is connected with the source electrode of the MOS tube, and the other end of the eighth resistor is connected with one end of the ninth resistor;
the other end of the ninth resistor is connected with the drain electrode of the MOS tube; and a self-checking sampling point is formed between the eighth resistor and the ninth resistor.
9. The regenerative electromotive force bleeder device according to claim 8, wherein when said drive circuit receives a high level signal,
judging whether the level of the self-checking sampling point is a low level;
if so, determining that the bleeder circuit works normally;
if not, determining that the bleeder circuit works abnormally.
10. The regenerative electromotive force bleeder device according to claim 8, wherein when said drive circuit receives a low level signal,
judging whether the level of the self-checking sampling point is a high level;
if so, determining that the bleeder circuit works normally;
if not, determining that the bleeder circuit works abnormally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910967291.4A CN110620374A (en) | 2019-10-11 | 2019-10-11 | Regenerated electromotive force relief device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910967291.4A CN110620374A (en) | 2019-10-11 | 2019-10-11 | Regenerated electromotive force relief device |
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| Publication Number | Publication Date |
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| CN110620374A true CN110620374A (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910967291.4A Pending CN110620374A (en) | 2019-10-11 | 2019-10-11 | Regenerated electromotive force relief device |
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| CN (1) | CN110620374A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN203911883U (en) * | 2014-06-23 | 2014-10-29 | 河南理工大学 | Driving circuit of switch element |
| CN104626996A (en) * | 2013-11-11 | 2015-05-20 | 比亚迪股份有限公司 | Bus capacitance discharging system for electric automobile and control method of bus capacitance discharging system |
| CN106571621A (en) * | 2015-10-12 | 2017-04-19 | 上海安浦鸣志自动化设备有限公司 | Regeneration electromotive force discharge device for DC drive |
| CN206947942U (en) * | 2017-06-23 | 2018-01-30 | 深圳市好盈科技有限公司 | A kind of skidding overpressure vent protection device and electron speed regulator |
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2019
- 2019-10-11 CN CN201910967291.4A patent/CN110620374A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104626996A (en) * | 2013-11-11 | 2015-05-20 | 比亚迪股份有限公司 | Bus capacitance discharging system for electric automobile and control method of bus capacitance discharging system |
| CN203911883U (en) * | 2014-06-23 | 2014-10-29 | 河南理工大学 | Driving circuit of switch element |
| CN106571621A (en) * | 2015-10-12 | 2017-04-19 | 上海安浦鸣志自动化设备有限公司 | Regeneration electromotive force discharge device for DC drive |
| CN206947942U (en) * | 2017-06-23 | 2018-01-30 | 深圳市好盈科技有限公司 | A kind of skidding overpressure vent protection device and electron speed regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20191227 |