CN213521658U - Simple control circuit - Google Patents
Simple control circuit Download PDFInfo
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- CN213521658U CN213521658U CN202022853586.XU CN202022853586U CN213521658U CN 213521658 U CN213521658 U CN 213521658U CN 202022853586 U CN202022853586 U CN 202022853586U CN 213521658 U CN213521658 U CN 213521658U
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Abstract
The embodiment of the utility model discloses simple and easy control circuit, including MOS pipe Q1, keep apart optoelectronic coupler U1, resistance R1, resistance R2, resistance R3, diode D1, keep apart optoelectronic coupler U1's the positive pole of input and pass through resistance R1 and connect the voltage positive pole, the D utmost point of MOS pipe Q1 is connected to the input negative pole; the G pole of the MOS transistor Q1 is connected with the anode of the diode D1 and one ends of the resistor R2 and the resistor R3; the other end of the resistor R3 and the S pole of the MOS transistor Q1 are grounded; the other end of the resistor R2 is connected with a voltage anode; the cathode of the diode D1 is connected to the primary side voltage anode. The utility model discloses only through a N type MOS pipe, an isolation optoelectronic coupler, three resistance and a diode just realize control function, simple structure, it is with low costs.
Description
Technical Field
The utility model relates to a switching power supply technical field especially relates to a simple and easy control circuit.
Background
The existing control circuit has the disadvantages of complex structure, multiple components and high cost, and can not meet the requirements of people.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides a simple and easy control circuit to make and simplify structure, reduce cost.
In order to solve the technical problem, the embodiment of the utility model provides a simple and easy control circuit, including MOS pipe Q1, keep apart optoelectronic coupler U1, resistance R1, resistance R2, resistance R3, diode D1, keep apart optoelectronic coupler U1's the positive pole of input and pass through resistance R1 and connect voltage positive pole, the D of MOS pipe Q1 is connected to the input negative pole; the G pole of the MOS transistor Q1 is connected with the anode of the diode D1 and one ends of the resistor R2 and the resistor R3; the other end of the resistor R3 and the S pole of the MOS transistor Q1 are grounded; the other end of the resistor R2 is connected with a voltage anode; the cathode of the diode D1 is connected to the primary side voltage anode.
Further, the MOS transistor Q1 is an N-type MOS transistor.
The utility model has the advantages that: the utility model discloses only through a N type MOS pipe, an isolation optoelectronic coupler, three resistance and a diode just realize control function, simple structure, it is with low costs.
Drawings
Fig. 1 is a circuit diagram of a simple control circuit according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the simple control circuit according to the embodiment of the present invention includes a MOS transistor Q1, an isolation photocoupler U1, a resistor R1, a resistor R2, a resistor R3, and a diode D1.
The positive electrode of the input end of the isolation photocoupler U1 is connected with the positive electrode of the voltage through a resistor R1 and is continuously electrified. The negative electrode of the input end is connected with the D electrode of the MOS tube Q1. The positive pole of the output end of the isolation photoelectric coupler U1 is externally connected with a high level of the secondary side, and the negative pole of the output end of the isolation photoelectric coupler U1 is connected with the negative pole of the secondary side.
The G-pole of the MOS transistor Q1 is connected to the positive pole of the diode D1 and one ends of the resistor R2 and the resistor R3. The other end of the resistor R3 and the S pole of the MOS transistor Q1 are grounded. The other end of the resistor R2 is connected with a voltage anode; the cathode of the diode D1 is connected to the primary side voltage anode.
In one embodiment, the MOS transistor Q1 is an N-type MOS transistor.
The working principle of the utility model is as follows: referring to fig. 1, V1 is the positive pole of primary side voltage 1, which is electrified for a long time; v2 is positive primary voltage 2, and V3 is high secondary. The voltage at node G is V × R3/(R2+ R3). When V2 is high, the voltage difference between the voltage at node G and V2 is small, the diode D1 is not conducting, and the voltage at point G is higher than the voltage V _ gs of Q1, so Q1 is fully conducting, V1 forms a loop via R1, pins 1 and 2 of U1 and Q1, and at the same time, pins 4 and 5 of U1 are conducting, and V3 becomes low voltage. Similarly, when V2 becomes low, D1 turns on, the voltage at node G becomes low, Q1 does not work, U1 does not work, and V3 remains high, thereby realizing the function.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A simple control circuit is characterized by comprising an MOS (metal oxide semiconductor) tube Q1, an isolation photoelectric coupler U1, a resistor R1, a resistor R2, a resistor R3 and a diode D1, wherein the anode of the input end of the isolation photoelectric coupler U1 is connected with the anode of a voltage through the resistor R1, and the cathode of the input end is connected with the D pole of the MOS tube Q1; the G pole of the MOS transistor Q1 is connected with the anode of the diode D1 and one ends of the resistor R2 and the resistor R3; the other end of the resistor R3 and the S pole of the MOS transistor Q1 are grounded; the other end of the resistor R2 is connected with a voltage anode; the cathode of the diode D1 is connected to the primary side voltage anode.
2. The simple control circuit as claimed in claim 1, wherein the MOS transistor Q1 is an N-type MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022853586.XU CN213521658U (en) | 2020-12-01 | 2020-12-01 | Simple control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022853586.XU CN213521658U (en) | 2020-12-01 | 2020-12-01 | Simple control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213521658U true CN213521658U (en) | 2021-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022853586.XU Active CN213521658U (en) | 2020-12-01 | 2020-12-01 | Simple control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213521658U (en) |
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2020
- 2020-12-01 CN CN202022853586.XU patent/CN213521658U/en active Active
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