CN211405863U - DC-DC conversion circuit - Google Patents
DC-DC conversion circuit Download PDFInfo
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- CN211405863U CN211405863U CN201922400661.4U CN201922400661U CN211405863U CN 211405863 U CN211405863 U CN 211405863U CN 201922400661 U CN201922400661 U CN 201922400661U CN 211405863 U CN211405863 U CN 211405863U
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- pwm controller
- power switch
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- switch device
- resistor
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Abstract
The utility model provides a DC-DC converting circuit, PWM controller and power switch device including built-in current detection device, the output of PWM controller with power switch device connects, power switch device's output with PWM controller's input is connected, power switch device's input termination DC input voltage, power switch device's output termination DC output voltage, built-in current detection device's PWM controller includes chip IC1, resistance R1, MOS pipe Q1, MOS pipe Q2. The utility model has the advantages that: through the built-in current detection device in the PWM controller, when the main current reaches a set upper limit value, the PMW controller turns off PWM output, so that compared with a traditional DC-DC circuit, a current detection circuit is reduced, the circuit is simpler and more reliable without reducing functions, and the cost is lower.
Description
Technical Field
The utility model relates to a converting circuit especially relates to a DC-DC converting circuit.
Background
An overcurrent detection device of a conventional DC TO DC conversion device is formed by using peripheral discrete components, as shown in fig. 1, and the operating principle is as follows:
1. the DC-DC controller controls the on and off of a power device (MOS tube) by outputting a PWM square wave with adjustable duty ratio, thereby converting the input voltage DC12V into DC voltage output of 5V & 3.3V.
2. A current detection resistor is added at the output end for detecting the current of the trunk line, the current on the trunk line is converted into a voltage signal and fed back to the PWM controller, and when the current of the trunk line reaches a set line-up value, the PWM controller turns off the PWM output.
The above scheme has the following defects:
1. the number of components is large, the control circuit is complex, and faults are easy to occur.
2. An additional current comparator is required, which results in increased cost.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a DC-DC conversion circuit.
The utility model provides a DC-DC converting circuit, PWM controller and power switch device including built-in current detection device, the output of PWM controller with power switch device connects, power switch device 'S output with PWM controller' S input is connected, power switch device 'S input termination DC input voltage, power switch device' S output termination DC output voltage, built-in current detection device 'S PWM controller includes chip IC1, resistance R1, MOS pipe Q1, MOS pipe Q2, resistance R1, MOS pipe Q1, MOS pipe Q2 constitute current detection device, chip IC 1' S pin OCSEET with resistance R1 'S one end is connected, resistance R1' S another termination voltage input VIN, MOS pipe Q1 'S D electrode connects the voltage input, MOS pipe Q1' S G electrode connects chip IC1 'S UGET, MOS pipe Q1' S S electrode voltage output connects VOUT, the D electrode of the MOS transistor Q2 is connected to the voltage output terminal VOUT, the G electrode of the MOS transistor Q2 is connected to the pin LGATE of the chip IC1, and the S electrode of the MOS transistor Q2 is grounded.
As a further improvement of the present invention, the pin PHASE of the chip IC1, the S pole of the MOS transistor Q1, and the D pole of the MOS transistor Q2 are respectively connected to the voltage output terminal VOUT after the inductor L1.
As a further improvement of the present invention, a resistor R2 is connected in series between the G pole of the MOS transistor Q1 and the pin UGATE of the chip IC 1.
As a further improvement of the present invention, a resistor R3 is connected in series between the G pole of the MOS transistor Q2 and the pin LGATE of the chip IC 1.
As a further improvement of the present invention, the resistor R1 is connected in parallel with a capacitor C4.
The utility model has the advantages that: through the scheme, the current detection device is built in the PWM controller, when the main current reaches the set upper limit value, the PMW controller turns off the PWM output, so that compared with the traditional DC-DC circuit, a current detection circuit is reduced, the circuit is simpler and more reliable without reducing the functions, and the cost is lower.
Drawings
Fig. 1 is a schematic diagram of a conventional DC-DC conversion circuit;
fig. 2 is a schematic diagram of a DC-DC converter circuit according to the present invention.
Fig. 3 is a circuit diagram of a PWM controller of a DC-DC converter circuit with a built-in current detection device according to the present invention.
Detailed Description
The present invention will be further described with reference to the following description and embodiments.
As shown in fig. 2 to fig. 3, a DC-DC conversion circuit includes a PWM controller 101 with a built-in current detection device and a power switching device 102, an output terminal of the PWM controller 101 is connected to the power switching device 102, an output terminal of the power switching device 102 is connected to an input terminal of the PWM controller 101, an input terminal of the power switching device 102 is connected to a DC input voltage, an output terminal of the power switching device 102 is connected to a DC output voltage, the PWM controller 101 with the built-in current detection device includes a chip IC1, a resistor R1, a MOS transistor Q1, and a MOS transistor Q2, the resistor R1, the MOS transistor Q1, and the MOS transistor Q2 form a current detection device, a pin OCSET of the chip IC1 is connected to one end of the resistor R1, another end of the resistor R1 is connected to a voltage input terminal, a D electrode of the MOS transistor Q1 is connected to a voltage input terminal VIN, a G electrode of the MOS transistor Q1 is connected to a pin UGATE of the chip IC1, the S pole of the MOS transistor Q1 is connected with the voltage output end VOUT, the D pole of the MOS transistor Q2 is connected with the voltage output end VOUT, the G pole of the MOS transistor Q2 is connected with the pin LGATE of the chip IC1, and the S pole of the MOS transistor Q2 is grounded.
As shown in fig. 2 to fig. 3, the pin PHASE of the chip IC1, the S-pole of the MOS transistor Q1, and the D-pole of the MOS transistor Q2 are respectively connected to the inductor L1 and then connected to the voltage output terminal VOUT.
As shown in fig. 2 to fig. 3, a resistor R2 is connected in series between the G pole of the MOS transistor Q1 and the pin UGATE of the chip IC 1.
As shown in fig. 2 to 3, a resistor R3 is connected in series between the G pole of the MOS transistor Q2 and the pin LGATE of the chip IC 1.
As shown in fig. 2 to 3, the resistor R1 is connected in parallel with a capacitor C4.
The utility model provides a pair of DC-DC converting circuit, PWM controller 101 is built-in to have a current detection device to be used for monitoring the electric current on the switch MOS pipe Q1, overcurrent trigger point is set for to pin OCSET, resistance R1 is connected and is used for setting for maximum operating current at pin OCSET, when the electric current on the switch MOS pipe Q1 reaches the upper limit threshold value of settlement, voltage on the pin PHASE will be less than the voltage on the pin OCSET, inside overcurrent protection mechanism is triggered, the PMW controller will turn off pin UGATE and pin LGATE output, MOS pipe Q1 and MOS pipe Q2 end simultaneously, VOUT does not have the output, reach overcurrent protection's purpose, a current detection circuit has been reduced than traditional DC-DC circuit, in the function that does not reduce, make the simple reliability that the circuit is more, the cost is lower.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (5)
1. A DC-DC conversion circuit, characterized in that: the PWM controller comprises a PWM controller with a built-in current detection device and a power switch device, wherein the output end of the PWM controller is connected with the power switch device, the output end of the power switch device is connected with the input end of the PWM controller, the input end of the power switch device is connected with a DC input voltage, the output end of the power switch device is connected with a DC output voltage, the PWM controller with the built-in current detection device comprises a chip IC1, a resistor R1, a MOS tube Q1 and a MOS tube Q2, the resistor R1, the MOS tube Q1 and the MOS tube Q2 form a current detection device, an OCSET (online state switch) of the chip IC1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a voltage input end VIN, a D electrode of the MOS tube Q1 is connected with a voltage input end VIN, a G electrode of the MOS tube Q1 is connected with a pin UG of a chip IC1, an S electrode of the ATE tube Q1 is connected with a voltage output end VOUT, and, the G pole of the MOS transistor Q2 is connected to the pin LGATE of the chip IC1, and the S pole of the MOS transistor Q2 is grounded.
2. The DC-DC conversion circuit according to claim 1, wherein: and a pin PHASE of the chip IC1, an S electrode of the MOS tube Q1 and a D electrode of the MOS tube Q2 are respectively connected with the inductor L1 and then connected with a voltage output end VOUT.
3. The DC-DC conversion circuit according to claim 1, wherein: and a resistor R2 is connected in series between the G pole of the MOS tube Q1 and the pin UGATE of the chip IC 1.
4. The DC-DC conversion circuit according to claim 1, wherein: a resistor R3 is connected in series between the G pole of the MOS transistor Q2 and the pin LGATE of the chip IC 1.
5. The DC-DC conversion circuit according to claim 1, wherein: the resistor R1 is connected with a capacitor C4 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922400661.4U CN211405863U (en) | 2019-12-27 | 2019-12-27 | DC-DC conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922400661.4U CN211405863U (en) | 2019-12-27 | 2019-12-27 | DC-DC conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211405863U true CN211405863U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922400661.4U Active CN211405863U (en) | 2019-12-27 | 2019-12-27 | DC-DC conversion circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN211405863U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114281058A (en) * | 2021-12-03 | 2022-04-05 | 上海宏英智能科技股份有限公司 | Control system and method |
-
2019
- 2019-12-27 CN CN201922400661.4U patent/CN211405863U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114281058A (en) * | 2021-12-03 | 2022-04-05 | 上海宏英智能科技股份有限公司 | Control system and method |
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