CN113866491A - Over-current detection circuit of winding driving circuit and design method thereof - Google Patents
Over-current detection circuit of winding driving circuit and design method thereof Download PDFInfo
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- CN113866491A CN113866491A CN202111051963.0A CN202111051963A CN113866491A CN 113866491 A CN113866491 A CN 113866491A CN 202111051963 A CN202111051963 A CN 202111051963A CN 113866491 A CN113866491 A CN 113866491A
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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Abstract
The invention belongs to the technical field of high-side drive overcurrent detection, and particularly relates to an overcurrent detection circuit of a winding drive circuit and a design method thereof. The detection circuit includes: the voltage following circuit, the amplification adjusting circuit and the current following circuit can bear high-side power supply surge and peak and are low in cost. Meanwhile, a design method aiming at the detection circuit is also provided, so that the detection circuit is easy to realize and is suitable for an airborne electronic environment.
Description
Technical Field
The invention belongs to the technical field of high-side drive overcurrent detection, and mainly relates to a winding drive circuit overcurrent detection circuit and a design method thereof when a high-side drive circuit has overcurrent and high-side power supply surge.
Background
The high-side drive circuit is widely applied in the fields of power electronics and the like, the overcurrent protection of the drive circuit is of great importance, the fault detection circuit is positioned at the front edge of the protection circuit and is generally positioned near the detected circuit, the current of the detected circuit is detected, and the detected information is sent to the drive control circuit in a voltage mode.
At present, the detection circuitry overflows on the most common high limit, mainly put collection sampling resistor both ends voltage through fortune to convert to the amplified voltage that corresponds, owing to be in the high limit, fortune is put the circuit and is received the public mould of high limit drive easily and disturb, and fortune is put the power supply and also is comparatively difficult, need can bear peak and surge voltage of high limit power, and system cost is higher, and circuit structure is complicated, and the fault detection performance is relatively poor, and practical application has received the limitation. Therefore, it is desirable to design an over-current detection method that can withstand high-side power surges, spikes, and is low in cost.
Disclosure of Invention
In view of this, the present invention provides an overcurrent detection circuit for a winding driving circuit, which has a simple design, is easy to implement, has a strong anti-interference capability, and can effectively detect an overcurrent fault, and the overcurrent detection circuit includes:
the voltage follower circuit is used for following the low-voltage end voltage of the sampling resistor;
the amplification adjusting circuit is used for ensuring the normal work of the voltage following circuit and the current following circuit;
and the current follower circuit is used for converting the sampling resistor current with higher common-mode voltage into the sampling circuit without common-mode voltage.
Further, the voltage follower circuit comprises a first PNP triode and a diode; the collector of the first PNP triode is connected with the base of the first PNP triode; the two ends of the diode are respectively connected with the collector and the emitter of the first PNP triode, and the direction is from the collector to the emitter;
the following voltage of the voltage following circuit is reduced along with the increase of the sampling current and is increased along with the reduction of the current; the diode is used for protecting the gap between the collector and the emitter of the first PNP triode from being damaged when the impact current arrives.
Further, the amplifying and adjusting circuit comprises a second PNP triode and a resistor R4; one end of the resistor R4 is connected with the emitter of the second PNP triode, and the other end of the resistor R4 is connected with digital ground; the base electrode of the second PNP triode is connected with a digital +5V, and the collector electrode of the second PNP triode is connected with the current following circuit;
the amplification adjusting circuit is used for automatically adjusting the amplification state according to the voltage conversion of the voltage following circuit, so that the first PNP triode and the triodes in the current following circuit are in the amplification area.
Further, the current following circuit comprises a conversion resistor R1, a capacitor C1 and an NPN triode, wherein one end of the conversion resistor R1 is connected with a high-side power supply, and the other end of the conversion resistor R1 is connected with an emitting electrode of the NPN triode; two ends of the capacitor C1 are respectively connected with the base electrode and the emitter electrode of the NPN triode; the collector of the second PNP triode is connected with the base of the NPN triode;
the current following circuit is used for following the voltage of the sampling resistor, converting the voltage into two ends of the conversion resistor to form current, and converting the current into a required voltage value according to an amplification requirement.
Further, when the winding driving circuit is in an overcurrent state, the method for enabling the first PNP triode to be in the amplification region comprises the following steps:
the voltage drop of the overcurrent current I at the sampling resistor R0 is more than 0.7V.
Meanwhile, the invention also provides a design method of the over-current detection circuit of the winding driving circuit, which comprises the following steps:
step 1: selecting a reasonable sampling resistance value R0 according to the overcurrent current I and by combining a formula R0I > 0.7;
step 2: setting the resistance R1 to be not more than 1K omega;
and step 3: selecting proper R3 according to the output current value R0I/R1 of the current follower circuit and the combination of the required voltage value;
and 4, step 4: and selecting proper R2 according to the R3 and the output current value R0I/R1 of the current follower circuit in combination with the characteristics of the triode.
By adopting the technical scheme, the invention can bring the following beneficial effects:
the invention provides a high-side overcurrent detection method of a winding driving circuit, which comprises the following steps: the overcurrent detection circuit is used for detecting the overcurrent state of the winding at a high side, and the drive control logic controls the field tube driver according to the overcurrent detection state and the actual working requirement, controls the working state of the winding and protects the field tube and the winding from working in a non-overcurrent state. The high-side winding overcurrent detection circuit comprises a voltage following function, a current following function, an amplification adjusting function and a current collecting function, the voltage following function is used for acquiring the current flowing through the winding on the high side, the current flowing through the winding is converted into a voltage signal, the current following function is used for converting the voltage signal into a current signal capable of being collected, the current is transmitted to the current collecting function, the voltage conversion of overcurrent detection current is realized, and the amplification adjusting function ensures that the voltage following function module and the current following function are in a normal working state. The voltage following function and the current following function are realized by using the triode, and the triode can bear the surge of a high-side power supply. The invention has simple design, easy realization and strong anti-interference capability, can effectively detect the overcurrent of the winding driving circuit, and is particularly suitable for airborne electronic environment.
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 embodiments will be briefly described below, and it is obvious that the drawings in the following description are only 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 schematic diagram illustrating an overall connection relationship of a winding driving circuit provided with a current detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an over-current detection circuit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. 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 noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
In an embodiment of the present invention, a winding driving circuit overcurrent detection circuit applied to the scenario shown in fig. 1 is provided, as shown in fig. 2, including:
the voltage follower circuit is used for following the low-voltage end voltage of the sampling resistor;
the amplification adjusting circuit is used for ensuring the normal work of the voltage following circuit and the current following circuit;
and the current follower circuit is used for converting the sampling resistor current with higher common-mode voltage into the sampling circuit without common-mode voltage.
In this embodiment, as shown in fig. 2, the voltage follower circuit includes a first PNP transistor and a diode; the collector of the first PNP triode is connected with the base of the first PNP triode; the two ends of the diode are respectively connected with the collector and the emitter of the first PNP triode, and the direction is from the collector to the emitter;
the following voltage of the voltage following circuit is reduced along with the increase of the sampling current and is increased along with the reduction of the current; the diode is used for protecting the gap between the collector and the emitter of the first PNP triode from being damaged when the impact current arrives.
In this embodiment, as shown in fig. 2, the amplification and adjustment circuit includes a second PNP transistor and a resistor R4; one end of the resistor R4 is connected with the emitter of the second PNP triode, and the other end of the resistor R4 is connected with digital ground; the base electrode of the second PNP triode is connected with a digital +5V, and the collector electrode of the second PNP triode is connected with the current following circuit;
the amplification adjusting circuit is used for automatically adjusting the amplification state according to the voltage conversion of the voltage following circuit, so that the first PNP triode and the triodes in the current following circuit are in the amplification area.
In this embodiment, as shown in fig. 2, the current follower circuit includes a conversion resistor R1, a capacitor C1, and an NPN transistor, where one end of the conversion resistor R1 is connected to the high-side power supply, and the other end is connected to an emitter of the NPN transistor; two ends of the capacitor C1 are respectively connected with the base electrode and the emitter electrode of the NPN triode; the collector of the second PNP triode is connected with the base of the NPN triode;
the current following circuit is used for following the voltage of the sampling resistor, converting the voltage into two ends of the conversion resistor to form current, and converting the current into a required voltage value according to an amplification requirement.
In this embodiment, as shown in fig. 2, when the winding driving circuit is in an overcurrent state, the method for enabling the first PNP transistor to be in the amplifying region includes:
the voltage drop of the overcurrent current I at the sampling resistor R0 is more than 0.7V.
In an embodiment, a design method of the over-current detection circuit of the winding driving circuit is provided, which includes the following steps:
step 1: selecting a reasonable sampling resistance value R0 according to the overcurrent current I and by combining a formula R0I > 0.7;
step 2: setting the resistance R1 to be not more than 1K omega;
and step 3: selecting proper R3 according to the output current value R0I/R1 of the current follower circuit and the combination of the required voltage value;
and 4, step 4: and selecting proper R2 according to the R3 and the output current value R0I/R1 of the current follower circuit in combination with the characteristics of the triode.
The present embodiment has the following four scenarios in common during operation:
scene 1: when the winding current I is equal to 0, that is, when no current passes through the "current sampling resistor" R0, the transistor V1 is turned on, the transistor V2 is turned on, the voltage of the V2 emitter is +50V, the voltage of the V2 base is about +49.3V, the transistor V3 is in an off state, and the voltage across the R3 is 0V.
Scene 2: when the winding current I gradually increases (I gradually increases), that is, when a current passes through the "current sampling resistor" R0, the voltage across the resistor R0 is "R0 × I", the transistor V1 is turned on, the transistor V2 is turned on, the voltage across the V2 emitter is "50V-R0 × I", the voltage across the V2 base is about "49.3V-R0 × I", the transistor V3 is gradually turned on, and the emitter and collector currents of the transistor V3 are substantially equal and are all about equal to "R0 × I/R1", so the voltage across the R3 is "R0 × I/R1 × R3". When the winding current I is 0, the voltage across R3 is also "R0I/R1R 3".
Scene 3: when the winding current I is increased to Iv2, the voltage across the resistor R0 is "R0 × Iv 2", the transistor V1 is turned on, the transistor V3 is turned on, and the transistor V2 is in an off state, that is, the voltage of the emitter of V3 is greater than the voltage of the emitter of V2, but the V4 is not triggered to be turned on, and at this time, the voltage across the resistor R3 is greater than the voltage across the resistor R3 in case 2.
Scene 4: when the winding current I continuously increases, the triode V1 is conducted, the triode V3 is conducted, the triode V2 is in a cut-off state, the V4 diode is conducted, the V2 is protected from being broken down by collector and emitter voltages, and the voltage across the R3 is (R0I-2.1)/R1R 3).
And combining the scene 1, the scene 2, the scene 3 and the scene 4, wherein the over-current detection circuit is required to work in the scene 1 and the scene 2 in a non-over-current state. The capacitor C1 is used for protecting the triode V3, and the capacitor C2 is used for confirming overcurrent time and filtering overcurrent burrs.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An overcurrent detection circuit for a winding drive circuit, comprising:
the voltage follower circuit is used for following the low-voltage end voltage of the sampling resistor;
the amplification adjusting circuit is used for ensuring the normal work of the voltage following circuit and the current following circuit;
and the current follower circuit is used for converting the sampling resistor current with higher common-mode voltage into the sampling circuit without common-mode voltage.
2. The overcurrent detection circuit of claim 1, wherein: the voltage follower circuit comprises a first PNP triode and a diode; the collector of the first PNP triode is connected with the base of the first PNP triode; the two ends of the diode are respectively connected with the collector and the emitter of the first PNP triode, and the direction is from the collector to the emitter;
the following voltage of the voltage following circuit is reduced along with the increase of the sampling current and is increased along with the reduction of the current; the diode is used for protecting the gap between the collector and the emitter of the first PNP triode from being damaged when the impact current arrives.
3. The overcurrent detection circuit of claim 2, wherein: the amplifying and adjusting circuit comprises a second PNP triode and a resistor R4; one end of the resistor R4 is connected with the emitter of the second PNP triode, and the other end of the resistor R4 is connected with digital ground; the base electrode of the second PNP triode is connected with a digital +5V, and the collector electrode of the second PNP triode is connected with the current following circuit;
the amplification adjusting circuit is used for automatically adjusting the amplification state according to the voltage conversion of the voltage following circuit, so that the first PNP triode and the triodes in the current following circuit are in the amplification area.
4. The overcurrent detection circuit of claim 3, wherein: the current following circuit comprises a conversion resistor R1, a capacitor C1 and an NPN triode, wherein one end of the conversion resistor R1 is connected with a high-side power supply, and the other end of the conversion resistor R1 is connected with an emitting electrode of the NPN triode; two ends of the capacitor C1 are respectively connected with the base electrode and the emitter electrode of the NPN triode; the collector of the second PNP triode is connected with the base of the NPN triode;
the current following circuit is used for following the voltage of the sampling resistor, converting the voltage into two ends of the conversion resistor to form current, and converting the current into a required voltage value according to an amplification requirement.
5. The overcurrent detection circuit of claim 2, wherein: when the winding driving circuit is in an overcurrent state, the method for enabling the first PNP triode to be in the amplifying region comprises the following steps:
the voltage drop of the overcurrent current I at the sampling resistor R0 is more than 0.7V.
6. The design method of the overcurrent detection circuit of the winding drive circuit as recited in any one of claims 1 to 5, comprising the steps of:
step 1: selecting a reasonable sampling resistance value R0 according to the overcurrent current I and by combining a formula R0I > 0.7;
step 2: setting the resistance R1 to be not more than 1K omega;
and step 3: selecting proper R3 according to the output current value R0I/R1 of the current follower circuit and the combination of the required voltage value;
and 4, step 4: and selecting proper R2 according to the R3 and the output current value R0I/R1 of the current follower circuit in combination with the characteristics of the triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111051963.0A CN113866491B (en) | 2021-09-08 | 2021-09-08 | Winding driving circuit overcurrent detection circuit and design method thereof |
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| CN202111051963.0A CN113866491B (en) | 2021-09-08 | 2021-09-08 | Winding driving circuit overcurrent detection circuit and design method thereof |
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| CN113866491B CN113866491B (en) | 2024-02-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341730A (en) * | 2004-05-27 | 2005-12-08 | Murata Mfg Co Ltd | Overcurrent protective circuit |
| CN203787935U (en) * | 2014-04-09 | 2014-08-20 | 太原科技大学 | Over-current protection circuit based on high side current detection |
| CN206389309U (en) * | 2017-01-24 | 2017-08-08 | 重庆新和平自动化有限公司 | The stepper motor driving circuit protected with over-current detection |
| US20190187190A1 (en) * | 2017-12-20 | 2019-06-20 | Fuji Electric Co.,Ltd. | Current detection circuit and current detection method of semiconductor element |
| CN112255451A (en) * | 2020-12-21 | 2021-01-22 | 上海芯龙半导体技术股份有限公司南京分公司 | Overcurrent detection circuit, overcurrent protection circuit and switching power supply |
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2021
- 2021-09-08 CN CN202111051963.0A patent/CN113866491B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005341730A (en) * | 2004-05-27 | 2005-12-08 | Murata Mfg Co Ltd | Overcurrent protective circuit |
| CN203787935U (en) * | 2014-04-09 | 2014-08-20 | 太原科技大学 | Over-current protection circuit based on high side current detection |
| CN206389309U (en) * | 2017-01-24 | 2017-08-08 | 重庆新和平自动化有限公司 | The stepper motor driving circuit protected with over-current detection |
| US20190187190A1 (en) * | 2017-12-20 | 2019-06-20 | Fuji Electric Co.,Ltd. | Current detection circuit and current detection method of semiconductor element |
| CN112255451A (en) * | 2020-12-21 | 2021-01-22 | 上海芯龙半导体技术股份有限公司南京分公司 | Overcurrent detection circuit, overcurrent protection circuit and switching power supply |
Non-Patent Citations (2)
| Title |
|---|
| SUN YUQING ET AL.: "A novel over-current protection circuit for LED constant current driver", 《2015 IEEE 16TH INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY》, pages 225 - 228 * |
| 张海亮 等: "IGBT过流保护电路设计", 《机电工程》, vol. 29, no. 8, pages 966 - 970 * |
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