CN212367126U - Low-power-consumption voltage reduction management circuit and electronic equipment - Google Patents
Low-power-consumption voltage reduction management circuit and electronic equipment Download PDFInfo
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- CN212367126U CN212367126U CN202021319421.8U CN202021319421U CN212367126U CN 212367126 U CN212367126 U CN 212367126U CN 202021319421 U CN202021319421 U CN 202021319421U CN 212367126 U CN212367126 U CN 212367126U
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Abstract
The utility model discloses a low-power consumption step-down management circuit and electronic equipment, this low-power consumption step-down management circuit include resistance R3, resistance R4, NMOS pipe Q3, zener diode Z1, resistance R5, triode Q4, NMOS pipe Q2, PMOS pipe Q1 and diode D1. The utility model discloses use conventional electronic component, do not use the singlechip, need not the software program, the cost is easy to control, has realized when equipment automatic shutdown or user think stop use, self-closing DC-DC (BUCK) step-down circuit has saved mechanical switch or similar switch, makes the circuit to the power consumptive minimum (limit) that stews of lithium cell etc. can hang on the battery for a long time.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a low-power consumption step-down management circuit and electronic equipment.
Background
The existing vehicle-mounted USB and 5V output voltage-reducing power supply products all use a DC-DC (BUCK) voltage-reducing circuit, and comprise automobiles, electric vehicles, electric bicycles and the like. Because the circuit has high self-power consumption, the circuit cannot be hung on a battery for a long time, and only can directly or indirectly turn off the power supply of an input end, for example, turn off a car key or directly pull off (remove) the device, and some products are provided with switches and directly turn off the device, so that the battery is protected from being discharged and damaged. In addition, a method for controlling the DC-BUCK by using a single chip microcomputer exists in the market, but the voltage endurance limit of the single chip microcomputer is limited, the self power consumption of the single chip microcomputer is difficult to control, the single chip microcomputer cannot be continuously dormant, and if a program has BUG or is interfered, the program may run away, and the stability of the program is relatively lower than that of a pure hardware circuit.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a low-power consumption step-down management circuit and electronic equipment that can manage to ordinary DC-DC (BUCK) step-down circuit, aims at realizing when equipment automatic shutdown or user think stop use, self-closing DC-DC (BUCK) step-down circuit to save mechanical switch or similar switch.
In order to achieve the above object, the present invention provides a low power consumption step-down management circuit, which includes a resistor R3, a resistor R4, an NMOS transistor Q3, a zener diode Z1, a resistor R5, a triode Q4, an NMOS transistor Q2, a PMOS transistor Q1, and a diode D1;
wherein, one end of the resistor R3 is connected with the source electrode and the power supply of the PMOS tube Q1, the other end is connected with one end of the resistor R4 and the drain electrode of the NMOS tube Q3, the other end of the resistor R4 is connected with one end of the Zener diode Z1 and the grid electrode of the NMOS transistor Q3, the other end of the voltage-stabilizing diode Z1 is grounded, the source electrode of the NMOS transistor Q3 is connected with one end of the resistor R5 and the pin E of the triode Q4, the pin B of the triode Q4 and the other end of the resistor R5 are respectively connected with a USB interface and one end of the diode D1, the other end of the diode D1 is connected with a buck conversion circuit, the pin C of the triode Q4 is connected with the grid electrode of the NMOS transistor Q2, the source electrode of the NMOS tube Q2 is grounded, the drain electrode of the NMOS tube Q2 is connected with one end of the resistor R1 and the grid electrode of the PMOS tube Q1, and the drain electrode of the PMOS tube Q1 is connected with the buck conversion circuit.
Preferably, the low-power-consumption step-down management circuit further includes a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected to one end of the resistor R3, and the other end of the resistor R2 is connected to one end of the PMOS transistor Q1.
Preferably, the low-power-consumption step-down management circuit further includes a resistor R6 and a resistor R7, one end of the resistor R6 is connected to the source of the NMOS transistor Q2, the other end of the resistor R6 is connected to one end of the resistor R7 and the gate of the NMOS transistor Q2, and the other end of the resistor R7 is connected to the pin C of the transistor Q4.
Preferably, the low-power-consumption step-down management circuit further includes a resistor R8, one end of the resistor R8 is connected to the pin B of the transistor Q4, and the other end of the resistor R5 is connected to the other end of the resistor R5, the USB interface, and one end of the diode D1.
Preferably, the low-power-consumption voltage-reduction management circuit further includes a capacitor C1, and one end of the capacitor C1 is connected to the source of the NMOS transistor Q3, one end of the resistor R5, and the pin E of the transistor Q4, respectively.
Preferably, the BUCK conversion circuit is a DC-DC BUCK circuit.
In order to achieve the above object, the present invention further provides an electronic device, which includes the low power consumption step-down management circuit as described above.
The embodiment of the utility model provides a low-power consumption step-down management circuit and electronic equipment, low-power consumption step-down management circuit include resistance R3, resistance R4, NMOS pipe Q3, zener diode Z1, resistance R5, triode Q4, NMOS pipe Q2, PMOS pipe Q1 and diode D1; wherein, one end of the resistor R3 is connected with the source and the power supply of the PMOS transistor Q1, the other end is connected with one end of the resistor R4 and the drain of the NMOS transistor Q3, the other end of the resistor R4 is connected with one end of the zener diode Z1 and the gate of the NMOS transistor Q3, the other end of the zener diode Z1 is grounded, the source of the NMOS transistor Q3 is connected with one end of the resistor R5 and the E pin of the transistor Q4, the B pin of the transistor Q4 and the other end of the resistor R5 are respectively connected with the USB interface and one end of the diode D1, the other end of the diode D1 is connected with the buck conversion circuit, the C pin of the transistor Q4 is connected with the gate of the NMOS transistor Q2, the source of the NMOS transistor Q2 is grounded, the drain of the NMOS transistor Q2 is connected with one end of the resistor R1 and the gate of the PMOS transistor Q1, and the drain of the PMOS transistor Q1 is connected with the buck conversion circuit, when the equipment automatically stops or a user thinks that the equipment stops using, the DC-DC (BUCK) voltage reduction circuit is automatically closed so as to omit a mechanical switch or a similar switch, so that the static electricity consumption of the circuit to a lithium battery and the like is reduced to the minimum (limit), and the circuit can be hung on the battery for a long time.
Drawings
FIG. 1 is a schematic diagram of a safety device of an embodiment of the low power consumption step-down management circuit of the present invention;
fig. 2 is a schematic diagram of the overall structure of the embodiment of the low power consumption step-down management circuit of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a low-power consumption step-down management circuit belongs to electron technical field, can be used for continuous power supply, intelligent USB class 5V power supply technique, the absolute low-power consumption step-down power supply technique of DC power supply technique, step-down power supply, low-power consumption continuous power supply, 5V power supply technique, USB class product.
The utility model discloses low-power consumption step-down management circuit, when electronic equipment automatic shutdown or user are for stopping the use, this circuit all can be discerned, then force the whole power supply of closing this DC-DC (BUCK), realize absolute low-power consumption after the self-closing, whole power consumption electric current is no longer than 10uA, can connect on the battery for a long time.
When a user needs to use the circuit, for example, a mobile phone is charged, the input power supply of a common DC-DC (BUCK) circuit can be automatically turned on by directly plugging the circuit, and the output end has continuous voltage output.
The utility model discloses a be conventional electronic component, do not use the singlechip, need not the software program, the cost is easy to control. The common DC-BUCK circuit is overlapped on the circuit, so that the common DC-BUCK circuit can be continuously connected on low-voltage batteries or equipment such as lithium batteries and the like for a long time, and a user does not worry about forgetting to turn off a power supply.
Specifically, referring to fig. 1 and fig. 2, a preferred embodiment of the present invention provides a low power consumption step-down management circuit, which includes a resistor R3, a resistor R4, an NMOS transistor Q3, a zener diode Z1, a resistor R5, a transistor Q4, an NMOS transistor Q2, a PMOS transistor Q1, and a diode D1.
Wherein, one end of the resistor R3 is connected with the source electrode and the power supply of the PMOS tube Q1, the other end is connected with one end of the resistor R4 and the drain electrode of the NMOS tube Q3, the other end of the resistor R4 is connected with one end of the Zener diode Z1 and the grid electrode of the NMOS transistor Q3, the other end of the voltage-stabilizing diode Z1 is grounded, the source electrode of the NMOS transistor Q3 is connected with one end of the resistor R5 and the pin E of the triode Q4, the pin B of the triode Q4 and the other end of the resistor R5 are respectively connected with a USB interface and one end of the diode D1, the other end of the diode D1 is connected with a buck conversion circuit, the pin C of the triode Q4 is connected with the grid electrode of the NMOS transistor Q2, the source electrode of the NMOS tube Q2 is grounded, the drain electrode of the NMOS tube Q2 is connected with one end of the resistor R1 and the grid electrode of the PMOS tube Q1, and the drain electrode of the PMOS tube Q1 is connected with the buck conversion circuit.
Thus, with the above-described scheme, it is achieved that the DC-DC (BUCK) step-down circuit is automatically turned off when the device is automatically stopped or the user thinks it is not in use, so that a mechanical switch or the like is omitted.
Specifically, as an embodiment, the buck conversion circuit is a DC-DC buck circuit or other buck circuits.
Further, in this embodiment, the low power consumption step-down management circuit further includes a resistor R1 and a resistor R2, where one end of the resistor R1 is connected to one end of the resistor R3, and the other end is connected to one end of the resistor R2 and the gate of the PMOS transistor Q1.
Furthermore, in this embodiment, the low power consumption step-down management circuit further includes a resistor R6 and a resistor R7, one end of the resistor R6 is connected to the source of the NMOS transistor Q2, the other end of the resistor R7 is connected to one end of the resistor R2, and the other end of the resistor R7 is connected to the pin C of the transistor Q4.
Furthermore, in this embodiment, the low power consumption step-down management circuit may further include a resistor R8, wherein one end of the resistor R8 is connected to the pin B of the transistor Q4, and the other end of the resistor R5 is connected to the USB interface and one end of the diode D1.
Furthermore, in this embodiment, the low-power-consumption voltage-reduction management circuit may further include a capacitor C1, and one end of the capacitor C1 is connected to the source of the NMOS transistor Q3, one end of the resistor R5, and the pin E of the transistor Q4, respectively.
The following uses the mobile phone as an example, and the working principle of the low power consumption step-down management circuit of the present invention is explained with reference to fig. 1.
The power supply + 9-100V input end, through resistance R3, resistance R4 and NMOS pipe Q3, generate +5.7V voltage behind zener diode Z1, pass through resistance R5 to the USB output, can form about 0.7V's pressure drop on resistance R5 after loads such as cell-phones are inserted, make triode Q4 switch on, later NMOS pipe Q2 switches on, PMOS pipe Q1 just is opened and is supplied power for conventional DC-DC BUCK, the output just can have +5V and pass through diode D1 and supply power for USB continuously. When loads such as a mobile phone and the like are removed, the voltage drop on the resistor R5 disappears immediately, the triode Q4, the NMOS tube Q2 and the PMOS tube Q1 are automatically closed, and the conventional DC-DC BUCK circuit stops working when high-voltage power supply is lost and does not consume power any more until a load is connected to the USB port again.
The utility model discloses low-power consumption step-down management circuit's beneficial effect is: the utility model adopts the above technical scheme, including resistance R3, resistance R4, NMOS pipe Q3, zener diode Z1, resistance R5, triode Q4, NMOS pipe Q2, PMOS pipe Q1 and diode D1; wherein, one end of the resistor R3 is connected with the source and the power supply of the PMOS transistor Q1, the other end is connected with one end of the resistor R4 and the drain of the NMOS transistor Q3, the other end of the resistor R4 is connected with one end of the zener diode Z1 and the gate of the NMOS transistor Q3, the other end of the zener diode Z1 is grounded, the source of the NMOS transistor Q3 is connected with one end of the resistor R5 and the E pin of the transistor Q4, the B pin of the transistor Q4 and the other end of the resistor R5 are respectively connected with the USB interface and one end of the diode D1, the other end of the diode D1 is connected with the buck conversion circuit, the C pin of the transistor Q4 is connected with the gate of the NMOS transistor Q2, the source of the NMOS transistor Q2 is grounded, the drain of the NMOS transistor Q2 is connected with one end of the resistor R1 and the gate of the PMOS transistor Q1, and the drain of the PMOS transistor Q1 is connected with the buck conversion circuit, when the equipment automatically stops or a user thinks that the equipment stops using, the DC-DC (BUCK) voltage reduction circuit is automatically closed so as to omit a mechanical switch or a similar switch, so that the static electricity consumption of the circuit to a lithium battery and the like is reduced to the minimum (limit), and the circuit can be hung on the battery for a long time.
In order to achieve the above object, the present invention further provides an electronic device, the electronic device includes the low power consumption step-down management circuit according to the above embodiments, the low power consumption step-down management circuit has been elaborated, and is not repeated here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (7)
1. A low-power-consumption voltage reduction management circuit is characterized by comprising a resistor R3, a resistor R4, an NMOS (N-channel metal oxide semiconductor) transistor Q3, a voltage-stabilizing diode Z1, a resistor R5, a triode Q4, an NMOS transistor Q2, a PMOS (P-channel metal oxide semiconductor) transistor Q1 and a diode D1;
wherein, one end of the resistor R3 is connected with the source electrode and the power supply of the PMOS tube Q1, the other end is connected with one end of the resistor R4 and the drain electrode of the NMOS tube Q3, the other end of the resistor R4 is connected with one end of the Zener diode Z1 and the grid electrode of the NMOS transistor Q3, the other end of the voltage-stabilizing diode Z1 is grounded, the source electrode of the NMOS transistor Q3 is connected with one end of the resistor R5 and the pin E of the triode Q4, the pin B of the triode Q4 and the other end of the resistor R5 are respectively connected with a USB interface and one end of the diode D1, the other end of the diode D1 is connected with a buck conversion circuit, the pin C of the triode Q4 is connected with the grid electrode of the NMOS transistor Q2, the source electrode of the NMOS tube Q2 is grounded, the drain electrode of the NMOS tube Q2 is connected with one end of the resistor R1 and the grid electrode of the PMOS tube Q1, and the drain electrode of the PMOS tube Q1 is connected with the buck conversion circuit.
2. The low-power-consumption voltage-reduction management circuit according to claim 1, further comprising a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected to one end of the resistor R3, and the other end of the resistor R2 is connected to one end of the resistor R1 and the gate of the PMOS transistor Q1.
3. The low-power-consumption voltage-dropping management circuit according to claim 2, further comprising a resistor R6 and a resistor R7, wherein one end of the resistor R6 is connected to the source of the NMOS transistor Q2, the other end of the resistor R7 is connected to the gate of the NMOS transistor Q2, and the other end of the resistor R7 is connected to the C pin of the transistor Q4.
4. The low-power-consumption voltage reduction management circuit according to claim 3, further comprising a resistor R8, wherein one end of the resistor R8 is connected to the pin B of the transistor Q4, and the other end of the resistor R5 is connected to the other end of the resistor R5, the USB interface, and one end of a diode D1.
5. The low-power-consumption voltage-reducing management circuit according to claim 4, further comprising a capacitor C1, wherein one end of the capacitor C1 is connected to the source of the NMOS transistor Q3, one end of the resistor R5, and the E pin of the transistor Q4, respectively.
6. The low power consumption BUCK management circuit according to any one of claims 1 to 5, wherein the BUCK converter circuit is a DC-DC BUCK circuit.
7. An electronic device, characterized in that the electronic device comprises a low power consumption buck management circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021319421.8U CN212367126U (en) | 2020-07-07 | 2020-07-07 | Low-power-consumption voltage reduction management circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021319421.8U CN212367126U (en) | 2020-07-07 | 2020-07-07 | Low-power-consumption voltage reduction management circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN212367126U true CN212367126U (en) | 2021-01-15 |
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| CN202021319421.8U Active CN212367126U (en) | 2020-07-07 | 2020-07-07 | Low-power-consumption voltage reduction management circuit and electronic equipment |
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