CN210666441U - Low-power standby driving circuit of electric wrench based on single chip microcomputer control - Google Patents
Low-power standby driving circuit of electric wrench based on single chip microcomputer control Download PDFInfo
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- CN210666441U CN210666441U CN201922166522.XU CN201922166522U CN210666441U CN 210666441 U CN210666441 U CN 210666441U CN 201922166522 U CN201922166522 U CN 201922166522U CN 210666441 U CN210666441 U CN 210666441U
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Abstract
The embodiment of the utility model discloses electric spanner's low-power standby drive circuit based on single chip microcomputer control, including triode Q1, diode D7, diode D8, triode Q11, resistance R4, resistance R5, resistance R7, resistance R8 and key switch; the E pole of the triode Q1 is externally connected with a power input end, the C pole of the triode Q1 is connected with the BAT _ V end of the electric wrench, and the B pole of the triode Q11 is connected with the power input end, the C pole of the triode Q3526 and the diode D8; the diode D8 is connected with the cathode of the diode D7 and the key switch; the B pole of the triode Q11 is connected with the singlechip through a resistor R7, and the E pole of the triode Q11 is grounded; two ends of the resistor R8 are respectively connected with the B pole and the E pole of the triode Q11; the anode of the diode D7 is connected with the singlechip. The utility model discloses a triode control main power supply in the time of last electricity, can open the power through button control triode, cuts off the triode through the chip in the time of the shutdown to realized cutting off the purpose of main power supply, kept almost 0 electric current standby.
Description
Technical Field
The utility model relates to an electric spanner technical field especially relates to a low-power standby drive circuit of electric spanner based on single chip microcomputer control.
Background
With the improvement of living standard, consumers have higher and higher requirements on the quality of electric tools and the standby power consumption of products. Most electric wrenches in the market realize 0 power consumption standby by forcibly disconnecting a main power supply through a mechanical switch, and the rest part of electric wrenches enter a sleep mode after a period of time to reduce power consumption and enter a standby state.
The adoption of a mechanical switch to cut off a main power supply can increase some cost, the mechanical switch increases complexity, is easy to damage, has poor contact and the like, has potential safety hazards, and sometimes a user forgets to manually shut down the power supply, so that the phenomenon that the battery is dead after a period of time is caused. If the chip is in a dormant mode for standby, the standby current 3ma of the chip is high in power consumption and short in standby time, and the requirements of users are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a low-power standby drive circuit of electric spanner based on single chip microcomputer control to make just can automatic shutdown after the user does not operate a period.
In order to solve the technical problem, an embodiment of the present invention provides a low-power standby driving circuit of an electric wrench based on single chip microcomputer control, including a transistor Q1, a diode D7, a diode D8, a transistor Q11, a resistor R4, a resistor R5, a resistor R7, a resistor R8 and a key switch; the triode Q1 is a PNP type triode, the E pole of the triode Q1 is externally connected with a power input end, the C pole of the triode Q1 is connected with the BAT _ V end of the electric wrench, the B pole of the triode Q1 is connected with the power input end through a resistor R4, and the C pole of the triode Q11 and the anode of a diode D8 are connected through a resistor R5; the cathode of the diode D8 is connected with the cathode of the diode D7 and one end of the key switch; the B pole of the triode Q11 is connected with the singlechip through a resistor R7, and the E pole of the triode Q11 is grounded; two ends of the resistor R8 are respectively connected with the B pole and the E pole of the triode Q11; the other end of the key switch is grounded, and the anode of the diode D7 is connected with the singlechip.
Further, the capacitor C2 is included, and the capacitor C2 is connected in parallel with the resistor R8.
Further, the circuit also comprises a diode D2 and a capacitor C3, wherein the anode of the diode D2 is connected with the C pole of the triode Q1; one end of the capacitor C3 is connected with the cathode of the diode D2, and the other end is grounded.
The utility model has the advantages that: the utility model adopts the triode to control the main power supply, when the power is on, the triode can be controlled by the key to turn on the power supply, and when the power is off, the triode is turned off by the chip, thereby realizing the purpose of cutting off the main power supply and keeping almost 0 current standby; compared with a method for standby by sleeping a single chip microcomputer, the standby power consumption is greatly reduced, the cost is not increased, the standby effect close to a mechanical switch can be achieved, stability and reliability are realized, and energy is saved.
Drawings
Fig. 1 is a circuit diagram of a low-power standby driving circuit of an electric wrench based on single chip microcomputer control 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 low power standby driving circuit of the electric wrench based on the mcu according to the embodiment of the present invention includes a transistor Q1, a diode D7, a diode D8, a transistor Q11, a resistor R4, a resistor R5, a resistor R7, a resistor R8, and a key switch.
The transistor Q1 is a PNP type transistor, preferably MMBT 5401. The E pole of the triode Q1 is externally connected with a power input end, the C pole is connected with the BAT _ V end of the electric wrench, and the B pole is connected with the power input end through a resistor R4 and connected with the C pole of the triode Q11 and the anode of a diode D8 through a resistor R5. The cathode of the diode D8 is connected to the cathode of the diode D7 and one end of the key switch.
The triode Q11 is an NPN type triode, the B pole of the triode Q11 is connected with the singlechip (connected with the control pin of the singlechip MCU-OB 6617) through a resistor R7, and the E pole of the triode Q11 is grounded. Two ends of the resistor R8 are respectively connected with the B pole and the E pole of the triode Q11. The other end of the key switch is grounded, and the anode of the diode D7 is connected with the singlechip (the singlechip MCU-OB6617 detects the signal change of the key switch through the diode D7). For example, MCU-OB6617 is mostly adopted by the singlechip of the electric wrench controlled by the singlechip on the market,
as an implementation mode, the low-power standby driving circuit of the electric wrench based on the single chip microcomputer control further comprises a capacitor C2, and the capacitor C2 is connected with a resistor R8 in parallel.
As an implementation mode, the low-power standby driving circuit of the electric wrench based on the single chip microcomputer control further comprises a diode D2 and a capacitor C3, wherein the positive electrode of the diode D2 is connected with the C electrode of the triode Q1; one end of the capacitor C3 is connected with the cathode of the diode D2, and the other end is grounded. The capacitor C3 is used for filtering, and the cathode of the diode D2 can be connected with other partial circuits of the electric wrench.
As shown in fig. 1, DC is a power input, the on/off of the circuit is controlled by a PNP triode MMBT5401, when the circuit is powered on, the key switch K1 is not pressed, the base of the triode Q1 has no current, the triode Q1 is in a non-conducting state, the whole circuit has no current coming in, and is in a power off state, and the current at this time is almost equal to 0; when the key switch is pressed down, the base of the triode Q1 is pulled down, the state of the triode Q1 is changed from cut-off to conduction, the current reaches a BAT _ V position of system power supply through the triode Q1, at the moment, the system obtains power supply and starts to work, once the chip starts to run programs, the single chip can control the conduction of the triode Q11, so that the base of the triode Q1 is pulled down continuously, at the moment, even if the key switch is loosened, the triode Q1 is still conducted, and the system can work normally. After the user does not operate for a certain time, the single chip microcomputer judges the shutdown condition, then the triode Q11 is controlled to be closed, the base voltage of the triode Q1 is pulled high by the R4, the triode Q1 starts to cut off the current, the system enters a power-off state, the power consumption is almost equal to 0, and the ultra-low power consumption standby mode is realized. When the device needs to be awakened, the key switch is pressed again.
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 (3)
1. A low-power standby driving circuit of an electric wrench based on single chip microcomputer control is characterized by comprising a triode Q1, a diode D7, a diode D8, a triode Q11, a resistor R4, a resistor R5, a resistor R7, a resistor R8 and a key switch; the triode Q1 is a PNP type triode, the E pole of the triode Q1 is externally connected with a power input end, the C pole of the triode Q1 is connected with the BAT _ V end of the electric wrench, the B pole of the triode Q1 is connected with the power input end through a resistor R4, and the C pole of the triode Q11 and the anode of a diode D8 are connected through a resistor R5; the cathode of the diode D8 is connected with the cathode of the diode D7 and one end of the key switch; the B pole of the triode Q11 is connected with the singlechip through a resistor R7, and the E pole of the triode Q11 is grounded; two ends of the resistor R8 are respectively connected with the B pole and the E pole of the triode Q11; the other end of the key switch is grounded, and the anode of the diode D7 is connected with the singlechip.
2. The low-power standby driving circuit of the electric wrench controlled by the single chip microcomputer according to claim 1, further comprising a capacitor C2, wherein the capacitor C2 is connected in parallel with a resistor R8.
3. The low-power standby driving circuit of the electric wrench controlled by the single chip microcomputer according to claim 1, further comprising a diode D2 and a capacitor C3, wherein the anode of the diode D2 is connected to the C electrode of the transistor Q1; one end of the capacitor C3 is connected with the cathode of the diode D2, and the other end is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922166522.XU CN210666441U (en) | 2019-12-06 | 2019-12-06 | Low-power standby driving circuit of electric wrench based on single chip microcomputer control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922166522.XU CN210666441U (en) | 2019-12-06 | 2019-12-06 | Low-power standby driving circuit of electric wrench based on single chip microcomputer control |
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| Publication Number | Publication Date |
|---|---|
| CN210666441U true CN210666441U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922166522.XU Active CN210666441U (en) | 2019-12-06 | 2019-12-06 | Low-power standby driving circuit of electric wrench based on single chip microcomputer control |
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|---|---|
| CN (1) | CN210666441U (en) |
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2019
- 2019-12-06 CN CN201922166522.XU patent/CN210666441U/en active Active
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