CN112730959B - Overcurrent detection circuit of buck conversion circuit controller - Google Patents
Overcurrent detection circuit of buck conversion circuit controller Download PDFInfo
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- CN112730959B CN112730959B CN202011564586.6A CN202011564586A CN112730959B CN 112730959 B CN112730959 B CN 112730959B CN 202011564586 A CN202011564586 A CN 202011564586A CN 112730959 B CN112730959 B CN 112730959B
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 7
- 239000004020 conductor Substances 0.000 claims description 64
- 238000004804 winding Methods 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- G01R19/16533—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 application
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a buck conversion circuit controller overcurrent detection circuit which comprises a first control switch, a second control switch, a filter circuit and a comparator, wherein the first end of the first control switch is grounded, the second end of the first control switch is connected with the input end of the filter circuit and the first end of the second control switch, the second end of the second control switch is connected with the first end of the comparator, the second end of the comparator is grounded, the third end of the comparator is used as a signal output end, the control end of the first control switch is used for receiving a control signal, the control end of the second control switch is connected with a controllable power supply end VDD, and the output end of the filter circuit is grounded. The invention provides a high-precision overcurrent detection circuit of a buck conversion circuit controller.
Description
Technical Field
The invention relates to the technical field of circuit overcurrent protection, in particular to an overcurrent detection circuit of a buck conversion circuit controller.
Background
Recently, with the rapid development of analog semiconductors, buck controllers are widely used in the fields of computers, electronic or electrical instruments and the like. In Buck controllers, high load currents are increasingly applied, and in order to ensure the capability of the power tube to bear short-time overload, an overcurrent protection circuit is usually designed in the system.
Chinese patent publication No. CN103412180B, publication No. 2015, 12, entitled overcurrent detection circuit, the invention creates, this application includes a current detection Resistor (RSENSE) for sampling the operating current of the tested system and a voltage comparator (U2) provided with an overcurrent threshold, its characterized in that: the overcurrent detection circuit also comprises a current source (IB), a voltage source (Vcc), an overcurrent threshold value setting Resistor (RSET), a delay capacitor (COCT), a bleeder Resistor (RDIS), a first N-type MOS tube (M2A), a second N-type MOS tube (M2B) and a third N-type MOS tube (M2C), a fourth N-type MOS tube (M3A) and a fifth N-type MOS tube (M3B), a first P-type MOS tube (M1A) and a second P-type MOS tube (M1B) which respectively form a current mirror. The accuracy of the overcurrent protection is not high.
Disclosure of Invention
The invention provides a buck converter controller overcurrent detection circuit with high accuracy, which aims to solve the problem that the buck converter controller overcurrent detection circuit in the prior art is low in accuracy.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the technical scheme adopted for solving the technical problems is as follows: the utility model provides a step-down converting circuit controller overcurrent detection circuit, including first control switch, second control switch, filter circuit and comparator, first control switch first ground connection, filter circuit input and second control switch first end are connected to first control switch second end, comparator first end is connected to the second control switch second end, comparator second ground connection, comparator third end is as signal output part, first control switch control end is used for receiving control signal, controllable power supply end VDD is connected to the second control switch control end, filter circuit output ground connection. The overcurrent detection scheme can improve the precision to 5%, other schemes are generally about 20-30%, and the precision is not high.
Preferably, the second terminal connection of the second control switch is also connected to a reference current source Iref. The reference current source may provide a stable voltage.
Preferably, the first control switch is a mos transistor VT1, a source electrode of the mos transistor VT1 is grounded, a drain electrode of the mos transistor VT1 is used as a second end of the first control switch, and a gate electrode of the mos transistor VT1 is used as a control end of the first control switch.
Preferably, the second control switch is a mos transistor VT2, a source electrode of the mos transistor VT2 is used as a second end of the second control switch, a drain electrode of the mos transistor VT2 is used as a first end of the second control switch, and a gate electrode of the mos transistor VT2 is used as a control end of the second control switch.
Preferably, the filter circuit includes an inductor L1, a resistor R1 and a capacitor C1, the input end of the inductor L1 is used as the input end of the filter circuit, the output end of the inductor L1 is connected with the input end of the resistor R1 and the input end of the capacitor C1, and the output end of the resistor R1 and the output end of the capacitor C1 are used as the output end of the filter circuit.
Preferably, the filter circuit comprises a change resistor, the change resistor comprises an insulation winding column and a wire wound on the insulation winding column, two ends of the insulation winding column are respectively connected with an insulation fixing plate, a conductor sliding rail is arranged between the two insulation fixing plates, a conductor sliding block is arranged on the conductor sliding rail, a communicating piece is arranged on the conductor sliding block, an insulation skin is wrapped on the wire, no insulation skin is arranged at the wire contacted with the communicating piece, the communicating piece is electrically communicated with the wire, the input end of the change resistor is used as the input end of the filter circuit, the output end of the change resistor is grounded, and the conductor sliding rail is connected with the input end of the capacitor C1. The variable resistor can adjust the sizes of the inductance and the resistance, so that the filtering effect of the filtering circuit is ensured, the accuracy of the flow detection scheme is further improved, the conductor sliding block is electrically connected with the conductor sliding rail, and when the conductor sliding block slides on the conductor sliding rail, the communicating piece also slides on the lead wire at the same time to contact different parts of the lead wire, so that the resistance value of the resistance R1 is changed.
Preferably, the wire includes a forward winding wire and a reverse winding wire, and the forward winding wire is electrically connectable with the communication member.
Preferably, the two insulating fixing plates are further connected with an insulating guide rail, the insulating guide rail is connected with an inductance control plate in a sliding mode, two corresponding limiting plates are arranged on the inductance control plate, an insulating plate is further arranged on one side of the inductance control plate, and the insulating plate is arranged between the two limiting plates.
Preferably, a conductor plate is arranged on one side of the insulating plate, which is close to the middle part of the inductance control plate, and is fixedly connected with the inductance control plate, and the conductor plate is connected with the ground through a grounding wire.
Preferably, the rewinding wire is provided with a plurality of fractures, the rewinding wire at the fractures is provided with a pair of connecting blocks, the pair of connecting blocks on one side of the inductance control board with the insulating plate are disconnected, and the pair of connecting blocks on the side of the inductance control board without the insulating plate are contacted with each other to form electric connection. When the inductance control board slides left and right on the insulation guide rail, a part of paired connecting blocks are disconnected, a part of connecting blocks form electric connection, the limiting plate gives pressure to the connecting blocks, the connecting blocks are connected together to achieve the effect of contact, when the inductance control board moves left, the paired connecting blocks are separated by the conductor plates, at the moment, the paired connecting blocks are respectively positioned on two sides of the conductor plates and are in contact with the conductor plates, electric connection is achieved through the conductor plates, the conductor plates are grounded through wires, when the inductance control board continues to move left, the connecting blocks positioned on two sides of the conductor plates move to two sides of the insulation plate, the paired connecting blocks are disconnected and are not electrically connected any more, a magnetic field cannot be generated, the inductance intensity of the whole change resistor is changed, and only a pair of connecting blocks can be connected with the conductor plates simultaneously.
Therefore, the invention has the following beneficial effects: (1) The overcurrent detection scheme can improve the precision to 5 percent; (2) When the inductance control board slides left and right on the insulation guide rail, a part of paired connecting blocks are disconnected, a part of connecting blocks form electric connection, the limiting plate applies pressure to the connecting blocks, so that the connecting blocks are connected together to achieve the effect of contact, when the inductance control board moves left, the paired connecting blocks are separated by the conductor plates, at the moment, the paired connecting blocks are respectively positioned at two sides of the conductor plates and are contacted with the conductor plates, the electric connection is realized through the conductor plates, the conductor plates are grounded through wires, when the inductance control board continues to move left, the connecting blocks positioned at two sides of the conductor plates move to two sides of the insulation plate, the paired connecting blocks are disconnected, no electric connection is performed any more, no magnetic field is generated, and the inductance intensity of the whole change sensor is changed;
(3) The variable resistor can adjust the sizes of the inductance and the resistance, so that the filtering effect of the filtering circuit is ensured, the accuracy of the flow detection scheme is further improved, the conductor slide block is electrically connected with the conductor slide rail, and when the conductor slide block slides on the conductor slide rail, the communicating piece also slides on the lead wire at the same time to contact different parts of the lead wire, so that the resistance value of the resistance R1 is changed;
(4) By adopting the circuit disclosed by the invention, the overcurrent protection in the Buck controller is more accurate, and the effect of protecting the chip is achieved.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention
FIG. 2 is a schematic diagram of a variable resistor structure according to the present invention
Fig. 3 is a schematic diagram of an inductance control board according to the present invention
FIG. 4 is a schematic view of a connecting block according to the present invention
In the figure: 2. the variable resistor comprises a variable resistor, a 21-insulated winding post, a 22-counter winding wire, a 23-forward winding wire, a 24-conductor sliding rail, a 25-conductor sliding block, a 26-inductance control board, a 261-limit board, a 262-conductor board, a 263-insulated board and a 27-insulated guide rail.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
Examples: the utility model provides a buck conversion circuit controller overcurrent detection circuit, as shown in fig. 1, including first control switch, second control switch, filter circuit and comparator, first control switch first end ground connection, filter circuit input and second control switch first end are connected to first control switch second end, comparator first end is connected to the second control switch second end, comparator second end ground connection, comparator third end is as the signal output part, first control switch control end is used for receiving control signal, controllable power supply end VDD is connected to the second control switch control end, filter circuit output ground connection. The second terminal of the second control switch is also connected to the reference current source Iref. The reference current source may provide a stable voltage. The first control switch is a mos tube VT1, a source electrode of the mos tube VT1 is grounded, a drain electrode of the mos tube VT1 is used as a second end of the first control switch, and a grid electrode of the mos tube VT1 is used as a control end of the first control switch. The second control switch is a mos transistor VT2, the source electrode of the mos transistor VT2 is used as the second end of the second control switch, the drain electrode of the mos transistor VT2 is used as the first end of the second control switch, and the grid electrode of the mos transistor VT2 is used as the control end of the second control switch. The filter circuit comprises an inductor L1, a resistor R1 and a capacitor C1, wherein the input end of the inductor L1 is used as the input end of the filter circuit, the output end of the inductor L1 is connected with the input end of the resistor R1 and the input end of the capacitor C1, and the output end of the resistor R1 and the output end of the capacitor C1 are used as the output end of the filter circuit.
VT1 is Buck power down tube with impedance R vt1 The method comprises the steps of carrying out a first treatment on the surface of the VT2 is a matching pipe with impedance R vt2 . When the power down tube VT1 is turned on and the negative current OCP is detected, the current direction is clockwise as indicated by the arrow IOCP in fig. 1.
When the positive terminal voltage of the comparator comp is equal to 0, the comparator turns over to trigger OCP, i.e ocp *R vt1 +I ref *R vt2 ＝0。
When the gate electrode of the VT1 receives a trigger signal, the VT1 is conducted, the voltage of the drain electrode of the VT2 is pulled down, and the VT2 is conducted normally, so that the voltage of the negative end of the comparator comp is pulled down, the comparator turns over, and the OCP is triggered; the filtering circuit filters signals in the circuit, the detection precision of the circuit is improved, and the grid electrode of the mos tube VT2 is continuously provided with signals, so that the VT2 is always conducted.
As shown in fig. 2, the filter circuit includes a change resistor 2, the change resistor includes an insulation winding column 21, a wire wound on the insulation winding column, two ends of the insulation winding column are respectively connected with an insulation fixing plate, a conductor sliding rail 24 is arranged between the two insulation fixing plates, a conductor sliding block 25 is arranged on the conductor sliding rail, a communicating piece is arranged on the conductor sliding block, an insulating skin is wrapped on the wire, no insulating skin is arranged at the wire contacted with the communicating piece, the communicating piece is electrically communicated with the wire, the input end of the change resistor is used as the input end of the filter circuit, the output end of the change resistor is grounded, and the conductor sliding rail is connected with the input end of a capacitor C1. The wires include a forward winding wire 23 and a reverse winding wire 22, the forward winding wire being electrically connectable with the communication. The two insulating fixing plates are also connected with an insulating guide rail 27, the insulating guide rail is connected with an inductance control plate 26 in a sliding manner, as shown in fig. 3, two corresponding limiting plates 261 are arranged on the inductance control plate 26, an insulating plate 263 is further arranged on one side of the inductance control plate, and the insulating plate is arranged between the two limiting plates. The insulating board is close to inductance control panel middle part one side and sets up conductor plate 262, conductor plate and inductance control panel fixed connection, and the conductor plate passes through the earth connection wire. As shown in fig. 4, a plurality of breaks are formed in the rewinding wire, a pair of connection blocks are formed in the rewinding wire at the break, the pair of connection blocks on the side of the inductance control board with the insulating board are disconnected, and the pair of connection blocks on the side of the inductance control board without the insulating board are contacted with each other to form electrical connection.
The back winding wires are wound on the surface of the insulating column, the forward winding wires are wound on the back winding wires, the connecting blocks extend outwards from gaps of the forward winding wires to form a forward winding wire layer, a pair of connecting blocks extend between the two forward winding wires, and the forward winding wires play a role in fixing the back winding wires and the connecting blocks; the left side of the conductor plate is in a tip shape, so that a pair of connecting blocks can be separated conveniently, and an inclined plane can be formed on the right side of the connecting blocks, so that the left side of the conductor plate can be inserted conveniently, and the pair of connecting blocks can be separated conveniently; the connecting block protrudes a curved surface towards the middle, so that when the connecting block is subjected to the pressure of the limiting plate, the connecting block can be contacted well, and the occurrence of poor contact faults is avoided.
The overcurrent detection scheme can improve the precision to 5%, other schemes are generally about 20-30%, and the precision is not high.
The variable resistor can adjust the sizes of the inductance and the resistance, so that the filtering effect of the filtering circuit is ensured, the accuracy of the flow detection scheme is further improved, the conductor sliding block is electrically connected with the conductor sliding rail, and when the conductor sliding block slides on the conductor sliding rail, the communicating piece also slides on the lead wire at the same time to contact different parts of the lead wire, so that the resistance value of the resistance R1 is changed.
When the inductance control board slides left and right on the insulation guide rail, a part of paired connecting blocks are disconnected, a part of connecting blocks form electric connection, the limiting plate gives pressure to the connecting blocks, the connecting blocks are connected together to achieve the effect of contact, when the inductance control board moves left, the paired connecting blocks are separated by the conductor plates, at the moment, the paired connecting blocks are respectively positioned on two sides of the conductor plates and are in contact with the conductor plates, electric connection is achieved through the conductor plates, the conductor plates are grounded through wires, when the inductance control board continues to move left, the connecting blocks positioned on two sides of the conductor plates move to two sides of the insulation plate, the paired connecting blocks are disconnected and are not electrically connected any more, a magnetic field cannot be generated, the inductance intensity of the whole change resistor is changed, and only a pair of connecting blocks can be connected with the conductor plates simultaneously.
I ref The design is that a scheme of reference current can be adopted to ensure the accuracy.
Claims (7)
1. The step-down conversion circuit controller overcurrent detection circuit is characterized by comprising a first control switch, a second control switch, a filter circuit and a comparator, wherein the first end of the first control switch is grounded, the second end of the first control switch is connected with the input end of the filter circuit and the first end of the second control switch, the second end of the second control switch is connected with the first end of the comparator, the second end of the comparator is grounded, the third end of the comparator is used as a signal output end, the control end of the first control switch is used for receiving a control signal, and the control end of the second control switch is connected with a controllable power supply end VDD;
the filter circuit comprises a change resistor, the change resistor comprises an insulation winding column and wires wound on the insulation winding column, two ends of the insulation winding column are respectively connected with an insulation fixing plate, two insulation fixing plates are further connected with insulation guide rails, an inductance control plate is connected to the insulation guide rails in a sliding mode, two corresponding limiting plates are arranged on the inductance control plate, an insulating plate is further arranged on one side of the inductance control plate, the insulating plate is arranged in the middle of the two limiting plates, a conductor plate is arranged on one side, close to the middle of the inductance control plate, of the insulating plate, the left side of the conductor plate is in a tip shape, the conductor plate is fixedly connected with the inductance control plate, the conductor plate is connected with the ground through a grounding wire, the wires comprise a forward winding wire and a backward winding wire, the forward winding wire can be electrically connected with a communicating piece, the output end of the filter circuit is grounded, a plurality of fractures are formed in the backward winding wire, a pair of connecting blocks positioned on one side of the inductance control plate, and the pair of connecting blocks positioned on one side of the inductance control plate are disconnected, and the pair of connecting blocks positioned on one side of the inductance control plate are in contact with each other and form electrical connection.
2. The buck converter controller overcurrent detection circuit of claim 1, wherein the second terminal of the second control switch is further coupled to the reference current source Iref.
3. The buck converter controller overcurrent detection circuit of claim 1, wherein the first control switch is a mos transistor VT1, a source of the mos transistor VT1 is grounded, a drain of the mos transistor VT1 is used as a second end of the first control switch, and a gate of the mos transistor VT1 is used as a control end of the first control switch.
4. The buck converter controller overcurrent detection circuit of claim 1, wherein the second control switch is a mos transistor VT2, the source of the mos transistor VT2 is used as the second end of the second control switch, the drain of the mos transistor VT2 is used as the first end of the second control switch, and the gate of the mos transistor VT2 is used as the control end of the second control switch.
5. The overcurrent detection circuit of the buck converter circuit controller according to claim 1, wherein the filter circuit includes an inductor L1, a resistor R1 and a capacitor C1, the input terminal of the inductor L1 is used as the input terminal of the filter circuit, the output terminal of the inductor L1 is connected with the input terminal of the resistor R1 and the input terminal of the capacitor C1, and the output terminal of the resistor R1 and the output terminal of the capacitor C1 are used as the output terminals of the filter circuit.
6. The overcurrent detection circuit of the buck converter circuit controller of claim 5, wherein a conductor sliding rail is arranged between the two insulating fixing plates, a conductor sliding block is arranged on the conductor sliding rail, a communicating piece is arranged on the conductor sliding block, an insulating sheath is wrapped outside the conductor, the insulating sheath is not arranged at the position of the conductor contacted with the communicating piece, the communicating piece is electrically communicated with the conductor, the input end of the variable resistor is used as the input end of the filter circuit, the output end of the variable resistor is grounded, and the conductor sliding rail is connected with the input end of the capacitor C1.
7. The overcurrent detection circuit of the buck converter circuit controller of claim 1, wherein the rewind wire is wound around the surface of the insulating post, the forward wire is wound around the rewind wire, the connection block extends out of the gap between the forward wires and out of the forward wire layer, and a pair of connection blocks extends between the two forward wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011564586.6A CN112730959B (en) | 2020-12-25 | 2020-12-25 | Overcurrent detection circuit of buck conversion circuit controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011564586.6A CN112730959B (en) | 2020-12-25 | 2020-12-25 | Overcurrent detection circuit of buck conversion circuit controller |
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| CN112730959A CN112730959A (en) | 2021-04-30 |
| CN112730959B true CN112730959B (en) | 2024-04-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002281743A (en) * | 2001-03-19 | 2002-09-27 | Hitachi Ltd | Semiconductor integrated circuit and portable electronic apparatus |
| CN1862936A (en) * | 2005-03-17 | 2006-11-15 | 株式会社理光 | Step-down switching regulator |
| CN103475217A (en) * | 2013-09-06 | 2013-12-25 | 深圳Tcl新技术有限公司 | DC-DC circuit and overcurrent protection method thereof |
| CN105162314A (en) * | 2015-09-10 | 2015-12-16 | 电子科技大学 | Over-current detection circuit for BUCK converter |
| CN106601432A (en) * | 2016-12-13 | 2017-04-26 | 北京北广科技股份有限公司 | Adjustable inductor |
| CN108711484A (en) * | 2018-06-07 | 2018-10-26 | 苏州瑞非通信息科技有限公司 | A kind of variable inductor |
-
2020
- 2020-12-25 CN CN202011564586.6A patent/CN112730959B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002281743A (en) * | 2001-03-19 | 2002-09-27 | Hitachi Ltd | Semiconductor integrated circuit and portable electronic apparatus |
| CN1862936A (en) * | 2005-03-17 | 2006-11-15 | 株式会社理光 | Step-down switching regulator |
| CN103475217A (en) * | 2013-09-06 | 2013-12-25 | 深圳Tcl新技术有限公司 | DC-DC circuit and overcurrent protection method thereof |
| CN105162314A (en) * | 2015-09-10 | 2015-12-16 | 电子科技大学 | Over-current detection circuit for BUCK converter |
| CN106601432A (en) * | 2016-12-13 | 2017-04-26 | 北京北广科技股份有限公司 | Adjustable inductor |
| CN108711484A (en) * | 2018-06-07 | 2018-10-26 | 苏州瑞非通信息科技有限公司 | A kind of variable inductor |
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