CN211127762U - Startup and shutdown circuit - Google Patents
Startup and shutdown circuit Download PDFInfo
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- CN211127762U CN211127762U CN202020066620.6U CN202020066620U CN211127762U CN 211127762 U CN211127762 U CN 211127762U CN 202020066620 U CN202020066620 U CN 202020066620U CN 211127762 U CN211127762 U CN 211127762U
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Abstract
The utility model discloses a switching on and shutting down circuit, it includes: the load circuit, the first control circuit and the second control circuit; the load circuit comprises a power supply, a load, a silicon controlled rectifier and an MOS tube; the power supply is connected with one end of a load, and the other end of the load is connected with GND through a silicon controlled rectifier and an MOS tube; the anode of the controlled silicon is connected with the end part of the load, and the cathode of the controlled silicon is connected with the input end of the D pole of the MOS tube; the control electrode of the controlled silicon is connected with the first control circuit; the S pole output end of the MOS tube is connected with the GND; the grid G of the MOS tube is connected with the second control circuit; the circuit scheme provided by the utility model has simple components and low energy consumption, can complete the circuit closing by pressing the light touch key by inching, and can complete the circuit disconnection by pressing the light touch key for a long time, has simple and easy functions, and is convenient for integration with various circuit boards; the shutdown delay length can also be controlled by controlling the parameters of the capacitor and the fourth resistor.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, concretely relates to on-off circuit.
Background
In the prior art, in order to realize on-off control of an input power supply on products such as an image forming apparatus, a player, a mobile phone and the like, for a power switch, in order to realize short-press start-up and long-press shutdown functions, a common method is to use a microprocessor (micro control unit, abbreviated as MCU) for control, but a control program needs to be written, and multiple times of debugging are needed, which wastes time and labor, and the cost is increased because a control chip is expensive; another way is to use a self-locking switch, because the self-locking switch has a memory function, after the self-locking switch is pressed, the self-locking switch needs to be manually operated to reset, if the self-locking switch is forgotten to reset, when a corresponding device is powered on, certain potential safety hazards may exist, and because the self-locking switch is large in size, certain limitations can be generated on the design of the structure, and the appearance structure of the product needs to be designed according to the switch.
Disclosure of Invention
In order to solve the problem, the utility model provides an on-off circuit.
A power on/off circuit, comprising: the load circuit, the first control circuit and the second control circuit; the load circuit comprises a power supply, a load, a silicon controlled rectifier and an MOS tube; the power supply is connected with one end of a load, and the other end of the load is connected with GND through a silicon controlled rectifier and an MOS tube; the anode of the controlled silicon is connected with the end part of the load, and the cathode of the controlled silicon is connected with the input end of the D pole of the MOS tube; the control electrode of the controllable silicon is connected with the first control circuit; the S pole output end of the MOS tube is connected with GND; the grid G of the MOS tube is connected with the second control circuit;
furthermore, the first control circuit comprises a first resistor, a second resistor and a light touch key; the first resistor and the second resistor are connected in series, one end of the first resistor is connected with the power supply, and one end of the second resistor is connected with the GND; the input end of the light touch key is connected with the output end of the first resistor, and the other end of the light touch key is connected with the control electrode of the controlled silicon;
furthermore, the second control circuit comprises a triode and a capacitor; the base electrode of the triode is connected with the output end of the light touch key, and the collector electrode and the emitter electrode of the triode are connected in parallel at two ends of the capacitor; one end of the capacitor is connected with a grid G of the MOS tube, and the other end of the capacitor is connected with GND;
further, the device also comprises a sixth resistor; the sixth resistor is connected in parallel with two ends of the capacitor;
further, the device also comprises a fourth resistor; the collector of the triode is connected with one end of a fourth resistor, and the other end of the fourth resistor and the emitter of the triode are respectively connected with the two ends of a sixth resistor;
further, the device also comprises a third resistor; one end of the third resistor is connected with the power supply, and the other end of the third resistor is connected with one end of the capacitor;
furthermore, the device also comprises a fifth resistor and a seventh resistor; one end of the fifth resistor and one end of the seventh resistor are respectively connected with the output end of the light touch key; the other end of the seventh resistor is connected with the base electrode of the triode; the emitting electrode of the triode is connected with the other end of the seventh resistor; the other end of the fifth resistor is connected with GND.
The utility model provides a switching on and shutting down circuit, it includes: the load circuit, the first control circuit and the second control circuit; the load circuit comprises a power supply, a load, a silicon controlled rectifier and an MOS tube; the power supply is connected with one end of a load, and the other end of the load is connected with GND through a silicon controlled rectifier and an MOS tube; the anode of the controlled silicon is connected with the end part of the load, and the cathode of the controlled silicon is connected with the input end of the D pole of the MOS tube; the control electrode of the controllable silicon is connected with the first control circuit; the S pole output end of the MOS tube is connected with GND; the grid G of the MOS tube is connected with the second control circuit; the circuit scheme provided by the utility model has simple components and low energy consumption, can complete the circuit closing by pressing the light touch key by inching, and can complete the circuit disconnection by pressing the light touch key for a long time, has simple and easy functions, and is convenient for integration with various circuit boards; the shutdown delay length can also be controlled by controlling the parameters of the capacitor and the fourth resistor.
Drawings
Fig. 1 is a circuit schematic diagram of the switching on/off circuit of the present invention.
Detailed Description
Example (b):
referring to fig. 1, a power on/off circuit includes: a load circuit 1, a first control circuit 2, a second control circuit 3;
the load circuit 1 comprises a power supply 11, a load 12, a controllable silicon 13 and an MOS (metal oxide semiconductor) tube 14;
the power supply 11 is connected with one end of a load 12, and the other end of the load is connected with GND through a controllable silicon 13 and an MOS tube 14;
the anode of the controllable silicon 13 is connected with the end part of the load 12, and the cathode of the controllable silicon 13 is connected with the D pole input end of the MOS tube 14;
the control electrode of the controllable silicon 13 is connected with the first control circuit 2;
the S pole output end of the MOS tube 14 is connected with GND;
the grid G of the MOS tube 14 is connected with the second control circuit 3;
the first control circuit 2 comprises a first resistor 21, a second resistor 22 and a touch key 23;
the first resistor 21 and the second resistor 22 are connected in series, one end of the first resistor 21 is connected with the power supply 11, and one end of the second resistor is connected with GND;
the input end of the light touch key 23 is connected with the output end of the first resistor 21, and the other end of the light touch key is connected with the control electrode of the controllable silicon 13;
the second control circuit 3 comprises a third resistor 31, a fourth resistor 32, a fifth resistor 33, a sixth resistor 34, a seventh resistor 35, a triode 36 and a capacitor 37;
one end of the capacitor 37 is connected with the gate G of the MOS transistor 14, and the other end is connected with GND;
one end of the third resistor 31 is connected with the power supply 11, and the other end is connected with one end of the capacitor 37;
the sixth resistor 34 is connected in parallel to two ends of the capacitor 37;
one end of the fifth resistor 33 and one end of the seventh resistor 35 are respectively connected with the output end of the light touch key 23;
the other end of the seventh resistor 35 is connected with the base of the triode 36;
the collector of the triode 36 is connected with one end of the fourth resistor 32, and the emitter of the triode 36 is connected with the other end of the seventh resistor 35;
the other end of the fourth resistor 32 and the emitter of the triode 36 are respectively connected with two ends of the sixth resistor 34;
the other end of the fifth resistor 33 is connected to GND.
When the circuit is used, the touch button 23 is in an off state in the initial state of the circuit, the base electrode potential of the triode 36 is pulled down by the fifth resistor 33 and the seventh resistor 35, the triode 36 is cut off, the thyristor 13 is pulled down by the fifth resistor 33 similarly without trigger voltage, and the thyristor 13 is cut off similarly. The power supply 11 charges the capacitor 37 through the third resistor 31, the charging voltage is a divided voltage value of the third resistor 31 and the sixth resistor 34, and the divided voltage value is greater than the turn-on voltage of the MOS transistor 14, so that the MOS transistor 14 can be in a conduction state at any time, and at this time, the load 12 does not work because the thyristor 13 is turned off.
When the light touch button 23 is pressed by inching, the power supply 11 triggers and conducts the thyristor 13 through the voltage divided by the first resistor 21 and the second resistor 22, and because the voltage at two ends of the capacitor 37 is far larger than the conducting voltage of the MOS tube 14 when the light touch button 23 is pressed by inching, although the triode 36 is conducted, the voltage at two ends of the capacitor 37 cannot be rapidly reduced because of the existence of the fourth resistor 32 and is always larger than the conducting voltage of the MOS tube 14, so the MOS tube 14 is always in a conducting state, and the load works.
When the touch button 23 is pressed during the load working period, the triode 36 is conducted by the voltage divided by the first resistor 21 and the second resistor 22 of the power supply 11, the capacitor 37 discharges through the loop of the fourth resistor 32 and the triode 36, the MOS tube 14 is cut off when the voltage at two ends of the capacitor 37 is discharged to the turn-off voltage of the MOS tube 14 after a period of time delay, the silicon controlled rectifier 13 also cuts off the load and does not work when the power is off, after the button is released, the MOS tube 14 is cut off because the voltage at two ends of the capacitor 37 cannot reach the turn-on voltage of the MOS tube 14 at one moment after the button is released, and the circuit is recovered to the initial state.
The parameters of the capacitor 37 and the fourth resistor 32 simultaneously determine the shutdown delay length, and the larger the parameter value of the capacitor 37 and the fourth resistor 32 is, the larger the delay time is, and the smaller the parameter value is, the smaller the delay time is.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A power on/off circuit, comprising: it includes: a load circuit (1), a first control circuit (2), a second control circuit (3); the load circuit (1) comprises a power supply (11), a load (12), a controllable silicon (13) and an MOS (metal oxide semiconductor) tube (14); the power supply (11) is connected with one end of a load (12), and the other end of the load is connected with GND through a controllable silicon (13) and an MOS (metal oxide semiconductor) tube (14); the anode of the controllable silicon (13) is connected with the end part of the load (12), and the cathode of the controllable silicon (13) is connected with the input end of the D pole of the MOS tube (14); the control electrode of the controllable silicon (13) is connected with the first control circuit (2); the S pole output end of the MOS tube (14) is connected with GND; and the grid G of the MOS tube (14) is connected with the second control circuit (3).
2. A switching circuit as claimed in claim 1, characterized in that: the first control circuit (2) comprises a first resistor (21), a second resistor (22) and a light touch key (23); the first resistor (21) and the second resistor (22) are connected in series, one end of the first resistor (21) is connected with the power supply (11) mutually, and one end of the second resistor is connected with GND mutually; the input end of the light touch key (23) is connected with the output end of the first resistor (21), and the other end of the light touch key is connected with the control electrode of the controllable silicon (13).
3. A switching circuit according to claim 2, characterized in that: the second control circuit (3) comprises a triode (36) and a capacitor (37); the base electrode of the triode (36) is connected with the output end of the light touch key (23), and the collector electrode and the emitter electrode of the triode (36) are connected in parallel at two ends of the capacitor (37); one end of the capacitor (37) is connected with the grid G of the MOS tube (14), and the other end of the capacitor is connected with GND.
4. A switching circuit according to claim 3, characterized in that: a sixth resistor (34); and the sixth resistor (34) is connected in parallel with two ends of the capacitor (37).
5. The switching circuit according to claim 4, wherein: further comprising a fourth resistor (32); and the collector of the triode (36) is connected with one end of the fourth resistor (32), and the other end of the fourth resistor (32) and the emitter of the triode (36) are respectively connected with the two ends of the sixth resistor (34).
6. The switching circuit according to claim 5, wherein: further comprising a third resistor (31); one end of the third resistor (31) is connected with the power supply (11), and the other end of the third resistor is connected with one end of the capacitor (37).
7. The switching circuit according to claim 6, wherein: the circuit also comprises a fifth resistor (33) and a seventh resistor (35); one ends of the fifth resistor (33) and the seventh resistor (35) are respectively connected with the output end of the light touch key (23); the other end of the seventh resistor (35) is mutually connected with the base electrode of the triode (36); the emitting electrode of the triode (36) is mutually connected with the other end of the seventh resistor (35); the other end of the fifth resistor (33) is connected with GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020066620.6U CN211127762U (en) | 2020-01-14 | 2020-01-14 | Startup and shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020066620.6U CN211127762U (en) | 2020-01-14 | 2020-01-14 | Startup and shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211127762U true CN211127762U (en) | 2020-07-28 |
Family
ID=71689099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020066620.6U Active CN211127762U (en) | 2020-01-14 | 2020-01-14 | Startup and shutdown circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211127762U (en) |
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2020
- 2020-01-14 CN CN202020066620.6U patent/CN211127762U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215431 No. 8, wisteria Road, Liuhe Town, Taicang City, Suzhou City, Jiangsu Province Patentee after: Suzhou Haobo Medical Instrument Co., Ltd Address before: 215431 East Building, No. 8-1, Nanhai Road, Liuhe Town, Taicang City, Suzhou City, Jiangsu Province Patentee before: Suzhou Haobo Medical Instrument Co., Ltd |