CN108649663B - Voltage-limiting power supply circuit and electronic equipment - Google Patents
Voltage-limiting power supply circuit and electronic equipment Download PDFInfo
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- CN108649663B CN108649663B CN201810724376.5A CN201810724376A CN108649663B CN 108649663 B CN108649663 B CN 108649663B CN 201810724376 A CN201810724376 A CN 201810724376A CN 108649663 B CN108649663 B CN 108649663B
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- 239000003990 capacitor Substances 0.000 claims description 24
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
Classifications
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- H02J7/0077—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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Abstract
The application discloses a voltage-limiting power supply circuit and electronic equipment, wherein the voltage-limiting power supply circuit comprises: the drain electrode of the NMOS tube is connected with a power supply; the voltage dividing circuit is connected with the NMOS tube and used for dividing the voltage output by the power supply so as to reduce the output voltage of the NMOS tube; the system power supply port is connected with the source electrode of the NMOS tube and is used for providing a direct current power supply after voltage reduction; the NMOS tube works in the variable resistance region after being connected with a power supply. The application not only avoids the ripple problem of DC-DC voltage reduction, but also improves the problems of maximum power limit of resistance and voltage variation along with current to a great extent, and has low cost.
Description
Technical Field
The present application relates to the field of electronics, and in particular, to a voltage-limiting power supply circuit and an electronic device.
Background
Electronic devices such as unmanned aerial vehicles and electric bicycles are provided with motor parts with relatively high power, so that people commonly use a plurality of strings of battery packs to be connected in series to form high voltage so as to supply power to the motor. The battery voltage after series connection is typically between 10V and 60V, while the conventional processor chip supply voltage is typically within 5V. Therefore, in order to enable the processor chip to work safely and normally, a corresponding voltage reducing means is generally adopted.
The current common voltage reduction modes mainly comprise DC-DC voltage reduction and resistance voltage limitation. However, the DC-DC step-down mode has high conversion efficiency, but has large voltage ripple, and is not suitable for supplying power to the microprocessor; the output voltage of the resistor voltage limiting mode can be reduced along with the increase of current, and the voltage limiting degree is limited by the maximum power of the resistor.
Disclosure of Invention
The application provides a voltage-limiting power supply circuit and electronic equipment, which can avoid the voltage ripple problem and improve the voltage variation along with current and the maximum power limit of resistance.
A first aspect of the present application is to provide a voltage-limiting power supply circuit for reducing power consumption, including:
The drain electrode of the NMOS tube is connected with a power supply;
the voltage dividing circuit is connected with the NMOS tube and used for dividing the voltage output by the power supply so as to reduce the output voltage of the NMOS tube;
the system power supply port is connected with the source electrode of the NMOS tube and is used for providing a direct current power supply after voltage reduction;
the NMOS tube works in the variable resistance region after being connected with a power supply.
In one embodiment, the voltage dividing circuit includes a first voltage dividing unit;
the first voltage dividing unit comprises a first resistor and a second resistor which are connected in series, wherein the first end of the first resistor is connected with the drain electrode of the NMOS tube, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the grid electrode of the NMOS tube is connected between the first resistor and the second resistor.
In one embodiment, the voltage dividing circuit further includes a second voltage dividing unit;
The second voltage division unit comprises a third resistor and a fourth resistor which are connected in series, wherein the first end of the third resistor is connected with the source electrode of the NMOS tube, the second end of the third resistor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
In one embodiment, the voltage limiting power supply circuit further includes: the system power supply chip is arranged between the NMOS tube and the system power supply port;
The input end of the system power supply chip is connected with the source electrode of the NMOS tube and the first end of the third resistor, and the output end of the system power supply chip is connected with the system power supply port;
the enabling end of the system power chip is connected between the third resistor and the fourth resistor.
In one embodiment, the anti-reverse-filling circuit is connected between the power supply and the drain electrode of the NMOS tube;
The anti-reverse-filling circuit comprises a first diode and a fifth resistor, wherein the positive electrode of the first diode is connected with the power supply, and the negative electrode of the first diode is connected with the drain electrode of the NMOS tube;
the fifth resistor is connected in parallel with two ends of the first diode.
In one embodiment, the voltage-limiting power supply circuit further comprises a second zener diode;
And two ends of the second zener diode are connected between the grid electrode and the source electrode of the NMOS tube.
In one embodiment, the second zener diode is a bidirectional zener diode, and its voltage stability value does not exceed the voltage withstand value between the gate and the source of the NMOS transistor.
In one embodiment, the voltage limiting power supply circuit further includes: an input filter capacitor and/or an output filter capacitor;
one end of the input filter capacitor is connected with the input end of the system power chip, and the other end of the input filter capacitor is grounded;
one end of the output filter capacitor is connected with the output end of the system power chip, and the other end of the output filter capacitor is grounded.
In one embodiment, the voltage limiting power supply circuit further includes: a sixth electrical group;
The sixth resistor is connected between the source electrode of the NMOS tube and the input end of the system power supply chip.
A second aspect of the present application is to provide an electronic device, including: a microprocessor, and a voltage-limited power supply circuit for reducing power consumption as claimed in any one of claims 1 to 9;
And a system power supply port in the voltage limiting power supply circuit is connected with the microprocessor and is used for providing a step-down direct current power supply for the microprocessor.
In one embodiment, the electronic device is a drone.
According to the voltage limiting power supply circuit and the electronic equipment, the voltage is divided by the voltage dividing circuit and the NMOS tube is used for working in the variable resistor area to share the voltage, so that the higher power supply voltage is reduced to a range acceptable by a chip, the output voltage of the NMOS tube can be adjusted by the voltage dividing circuit, the voltage output by a power supply port of the system is not influenced by power supply current, the ripple problem of DC-DC voltage reduction is avoided, the problems of maximum power limitation of resistance and voltage variation along with current are improved to a great extent, and in addition, the circuit of the scheme is simple, and adopts some conventional components, so that the cost can be effectively saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings for those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a voltage-limiting power supply circuit according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a specific circuit of the voltage-limiting power supply circuit according to the embodiment shown in fig. 1;
fig. 3 is a schematic diagram of a specific circuit of a voltage-limiting power supply circuit according to a second embodiment of the present application;
fig. 4 is a schematic diagram of a specific circuit of a voltage-limiting power supply circuit according to a third embodiment of the present application;
fig. 5 is a schematic diagram of a specific circuit of a voltage-limiting power supply circuit according to a fourth embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict. It should be noted that, the "first" and "second" herein are used for distinguishing, and are not limited to the sequence.
Fig. 1 is a schematic structural diagram of a voltage-limiting power supply circuit according to a first embodiment of the present application; referring to fig. 1, this embodiment provides a voltage-limiting power supply circuit, which includes:
NMOS tube Q1, voltage divider 110 and system power port 120;
the drain electrode of the NMOS transistor Q1 is connected to the power supply BAT, and the source electrode of the NMOS transistor Q1 is connected to the system power supply port 120, where the system power supply port 120 is used to provide a reduced dc power supply to chips such as a microprocessor (not shown in the figure).
The voltage dividing circuit 110 is connected to the NMOS transistor Q1, and is configured to divide the voltage output by the power supply BAT to reduce the output voltage of the NMOS transistor Q1.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of a voltage-limiting power supply circuit of the embodiment shown in fig. 1, in this embodiment, the voltage-dividing circuit 110 includes a first voltage-dividing unit 112, the first voltage-dividing unit 112 includes a first resistor R1 and a second resistor R2 connected in series, a first end of the first resistor R1 is connected to a drain electrode of the NMOS transistor Q1, a second end of the first resistor R1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded; the gate of the NMOS transistor Q1 is connected between the first resistor R1 and the second resistor R2.
The first voltage dividing unit 112 is configured to divide a voltage provided by the power supply BAT, so that a gate voltage of the NMOS transistor Q1 is reduced.
The voltage-limiting power supply circuit provided by the application can be suitable for supplying power to chips with voltage-limiting requirements in various electronic equipment. In practical applications, the electronic devices include, but are not limited to, unmanned aerial vehicles, computers, mobile phones, and other electronic devices. In particular, the present application can be applied to miniaturized electronic devices such as unmanned aerial vehicles. Taking unmanned aerial vehicle as an example, the miniaturized device has small volume and limited space, so the integration level of the voltage-limiting power supply circuit is required, the circuit has simple structure, is convenient for realizing high integration level, and can realize voltage-limiting power supply without adopting a chip or a complex circuit with large occupied space.
Specifically, the power supply BAT is a system power supply of an electronic device, for example, for some electronic devices with a battery, a plurality of battery packs connected in series and mounted to the electronic device are the system power supplies for providing the electronic device. In practical application, because different modules are configured inside the electronic device, the system power supply port 120 is provided in the scheme in consideration of the use stability of the electronic device, and the system module can realize system power supply by being connected to the system power supply port 120. In addition, an NMOS transistor Q1 and a voltage dividing circuit 110 are disposed between the power supply BAT and the system power supply port 120, and the voltage is shared by the voltage dividing of the voltage dividing circuit 110 and the NMOS transistor operating in the variable resistor area, so that the higher power supply voltage is reduced to a range acceptable by a chip, and the output voltage can be adjusted by the voltage dividing circuit, so that the voltage output by the system power supply port is not affected by the power supply current, thereby avoiding the ripple problem of DC-DC voltage reduction, and greatly improving the problems of maximum power limitation of the resistor and the voltage variation along with the current.
Further, the system power supply refers to that the module which needs to be powered and has voltage limiting requirement in the whole system can select to obtain a power supply signal according to own needs, and not all the system modules are in a working and running state. For example, in the case of the whole system realizing power supply, each module in the system can still realize independent power supply based on the system power supply, that is, power supply or power-off control of part of the modules can still be performed, but the power supply and power-off of part of the modules do not affect the power supply state of the whole system.
In some schemes, to reduce the power consumption of the device, means like optimizing system software or implementing separate power supply to the modules are employed. In the latter example, the power supply of the different modules is provided by different power supply ports, or the power supply of the different modules realizes voltage limitation through different NMOS tubes. When a partial module does not need to be run, power to the partial module may be cut off.
In one embodiment, the microprocessor is connected to a system power port 120, and the system power port 120 enables power to be supplied to various modules including the microprocessor that have voltage limiting requirements, rather than power to only some of the modules.
The connection in this embodiment may be a direct connection or an indirect connection. Taking the connection between the NMOS tube Q1 and the system power supply port 120 as an example, the connection here may refer to that the NMOS tube Q1 is directly connected to the system power supply port 120; or the NMOS transistor Q1 is indirectly connected to the system power supply port 120, that is, other components may be connected between the two, for example, a system power chip for preprocessing an electrical signal may be provided.
In practical applications, in order to protect the system power supply BAT and the entire system, the electrical signal of the system power supply BAT needs to be preprocessed before being output to the entire system, so as to provide a stable, low-noise, and low-ripple power supply signal.
Optionally, fig. 3 is a schematic circuit diagram of a voltage-limiting power supply circuit according to a second embodiment of the present application; as can be seen from fig. 3, this embodiment provides a voltage-limiting power supply circuit, which is configured to ensure stability of power supply based on reduction of power supply voltage, and specifically, on the basis of any embodiment, the voltage-limiting power supply circuit may further include: a system power supply chip U1 disposed between the NMOS transistor Q1 and the system power supply port 120;
An input end of the system power supply chip U1 is connected with a source electrode of the NMOS tube Q1, and an output end of the system power supply chip U1 is connected with the system power supply port 120.
As an example of a practical scenario: the electric signal provided by the system power supply BAT is reduced in voltage through the NMOS tube Q1 and then is transmitted to the input end of the system power supply chip U1, and the power supply signal processed and output by the system power supply chip U1 through the NMOS tube Q1 is transmitted to the system power supply port 120, so that power supply to each module system with voltage limiting requirements including a microprocessor is realized. Alternatively, the system power chip U1 may be selected according to the requirement of the circuit design, for example, the system power chip U1 may be a low dropout linear regulator, which is not limited in this scheme. In practical application, the NC pin of the low dropout linear regulator can be suspended.
In one embodiment, the voltage of the power supply BAT is 36V, and the voltage withstand value of the system power chip U1 is 30V, so the voltage output by the power supply BAT needs to be reduced by the NMOS transistor and then the power is supplied to the system power chip U1.
In one embodiment, the system power chip U1 is model number TPS70933. It will be appreciated that in other embodiments, the system power chip U1 model is not limited thereto, and is not strictly limited herein.
In one embodiment, the voltage limiting power supply circuit may further include: an input filter capacitor C1 and/or an output filter capacitor C2; wherein,
One end of the input filter capacitor C1 is connected with the input end of the system power chip U1, and the other end of the input filter capacitor C1 is grounded;
one end of the output filter capacitor C2 is connected with the output end of the system power chip U1, and the other end of the output filter capacitor C2 is grounded.
Through setting up input filter capacitor C1 and output filter capacitor C2, can carry out filter processing to system power supply chip's input signal and output signal to optimize the power supply signal, guarantee the stability and the reliability of power supply signal.
The two embodiments can be implemented independently or in combination, namely, input filtering and output filtering are realized, so that the power supply quality is improved.
In the present embodiment, the voltage dividing circuit includes a first voltage dividing unit 112 and a second voltage dividing unit 114. The first voltage dividing unit 112 includes a first resistor R1 and a second resistor R2 connected in series, wherein a first end of the first resistor R1 is connected to a drain of the NMOS transistor Q1, a second end of the first resistor R1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded.
The second voltage division unit 114 includes a third resistor R3 and a fourth resistor R4 connected IN series, where a first end of the third resistor R3 is simultaneously connected to the source of the NMOS transistor Q1 and the input end IN of the system power chip U1, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is grounded.
The gate of the NMOS transistor Q1 is connected between the first resistor R1 and the second resistor R2, and the enable end EN of the system power chip U1 is connected between the third resistor R3 and the fourth resistor R4.
Specifically, the fifth resistor R2 and the sixth resistor R5 can be used as voltage dividing resistors of the system power chip U1, so as to optimize the working performance of the system power chip and improve the quality of the power supply signal.
According to the voltage limiting power supply circuit for reducing power consumption, the system power supply chip is utilized to pre-process the electric signals before the electric signals of the power supply are output to the system to supply power, so that the quality of the power supply signals is improved, and the equipment system and the power supply are effectively protected.
As an example of a practical scenario: the NMOS Q1 in this embodiment is configured to step down the voltage output by the power supply, and is responsible for transmitting a power supply signal to each module (such as a microprocessor) with a voltage limiting requirement of the entire system through the system power supply port 120. Specifically, when the power supply BAT is not turned on, the gate and the source of the NMOS transistor Q1 are in a low-level state due to the third resistor R3, the fourth resistor R4, and some ground resistors on the microprocessor, and the NMOS transistor Q1 is in an off state. When the power supply BAT is turned on, the gate voltage of the NMOS transistor Q1 is 1/2 bat=18v due to the voltage division between the first resistor R1 and the second resistor R2, and the source of the NMOS transistor Q1 is still at a low level at this time, so that the NMOS transistor Q1 is turned on, the power supply BAT begins to charge the input filter capacitor C1, the output filter capacitor C2, and the like, and at this time, the source voltage of the NMOS transistor Q1 gradually rises, and when the difference between the gate voltage of the NMOS transistor Q1 and the source voltage of the NMOS transistor Q1 is smaller than the turn-on voltage of the NMOS transistor Q1 and greater than 0, the NMOS transistor Q1 operates in a variable resistor region, and at this time, the NMOS transistor Q1 corresponds to a variable resistor, which adjusts its resistance value according to the magnitude of the load current, so that the source voltage of the NMOS transistor Q1 is always kept in a region close to the gate voltage of the NMOS transistor Q1.
Fig. 4 is a schematic diagram of a specific circuit of a voltage-limiting power supply circuit according to a third embodiment of the present application; referring to fig. 4, this embodiment provides a voltage limiting power supply circuit for reducing power consumption, which may further include, based on any of the above embodiments: a first diode D1 and a fifth resistor R5;
The positive pole of first diode D1 is connected with power supply BAT, and the negative pole of first diode D1 is connected with NMOS transistor Q1's drain electrode, and fifth resistance R5 connects in parallel at the both ends of first diode D1.
Through can connect first diode D1 between power supply and NMOS pipe, can prevent that the voltage from flowing backwards to power supply BAT, avoid causing the damage to power supply BAT, improve the reliability.
The first diode D1 and the fifth resistor R5 together form an anti-reverse-current circuit, and when the power supply BAT drops to a very low voltage in the moment due to short circuit or the like, the fifth resistor R5 can discharge current, so that the reverse surge current cannot damage the first diode D1, namely, the damage to the power supply BAT caused by reverse-current voltage is prevented.
In addition, in order to ensure the performance and stability of the NMOS transistor Q1, a sixth resistor R6 may be further disposed, where the sixth resistor R6 is connected between the source of the NMOS transistor Q1 and the input terminal of the system power chip U1, for current limiting.
As shown in fig. 5, in one embodiment, the voltage-limiting power supply circuit further includes a second zener diode D2, and two ends of the second zener diode D2 are connected between the gate and the source of the NMOS transistor Q1.
In this embodiment, the second zener diode is a bidirectional zener diode, so that voltage stabilizing effect on two sides can be achieved, the voltage stabilizing value is 16V, and it can be understood that in other embodiments, the specific voltage stabilizing value is not strictly limited, so long as the voltage withstanding value between the gate and the source of the NMOS transistor Q1 is ensured not to be exceeded.
The working principle of the voltage-limiting power supply circuit is described in detail below with reference to fig. 5:
When the voltage of the power supply BAT is not on, the gate and the source of the NMOS transistor Q1 are in a low level state due to the third resistor R3, the fourth resistor R4, and some grounding resistors on the microprocessor, and the NMOS transistor Q1 is in an off state.
When the power supply BAT is turned on, since the resistances of the first resistor R1 and the second resistor R2 divide the voltage of the gate of the NMOS transistor Q1 to 1/2 bat=18v, and the source of the NMOS transistor Q1 is still at a low level at this time, the NMOS transistor Q1 is turned on, the power supply BAT starts to charge the input filter capacitor C1 and the output filter capacitor C2, and at this time, the source voltage of the NMOS transistor Q1 gradually rises, and when the difference between the gate voltage of the NMOS transistor Q1 and the source voltage of the NMOS transistor Q1 is smaller than the turn-on voltage of the NMOS transistor Q1 and greater than 0, the NMOS transistor Q1 operates in a variable resistor region, and at this time, the NMOS transistor Q1 corresponds to a variable resistor that adjusts its resistance value according to the magnitude of the load current, so that the source voltage is always kept in a region close to the gate voltage (the difference between the turn-on voltages of the different MOS transistors, the difference between the gate and the source voltage is also different, in this example, the difference is about 1.5V, and the input voltage of the system power supply chip U1 is about 16.5V and the system power supply chip U1 is smaller than the withstand voltage of the system power supply chip U1). The voltage at the source of the NMOS Q1 can be seen as the input voltage of the system power chip U1 (the resistance of the sixth resistor R6 is generally small, and the voltage drop generated thereon is negligible), and the input voltage of the system power chip U1 can be stabilized within an acceptable range by the voltage limitation of the NMOS Q1. Meanwhile, the source voltage of the NMOS transistor Q1 can be adjusted by changing the ratio of the first resistor R1 to the second resistor R2.
The NMOS transistor Q1 is equivalent to a variable resistor which can be adjusted in time according to the load current, the output voltage of the source electrode of the NMOS transistor is always close to the grid voltage of the NMOS transistor by adjusting the internal resistance of the variable resistor, and the output voltage can be adjusted by adjusting the grid voltage of the NMOS transistor. In addition, the overcurrent and short circuit of the current of the system can be realized by the system power supply chip U1.
The application also provides an electronic device, comprising: a microprocessor, and a voltage-limited power supply circuit as in any one of the preceding embodiments;
And a system power supply port in the voltage limiting power supply circuit is connected with the microprocessor and is used for providing a step-down direct current power supply for the microprocessor.
Alternatively, the electronic device may be an unmanned aerial vehicle.
In the electronic device provided by this embodiment, the voltage limiting power supply circuit includes a system power supply port, and an NMOS tube and a voltage dividing circuit connected between the power supply and the system power supply port, where the NMOS tube steps down the voltage of the power supply and outputs the voltage to the system power supply port. After the power supply is connected, the voltage is shared by the voltage division of the voltage division circuit and the NMOS tube is used for working in the variable resistance area, so that the voltage of the higher power supply is reduced to a range acceptable by a chip, the output voltage can be adjusted through the voltage division circuit, the voltage output by a power supply port of the system is not influenced by the power supply current, the ripple problem of DC-DC voltage reduction is avoided, the problems of resistance maximum power limitation and voltage variation along with current are improved to a great extent, and in addition, the circuit of the scheme is simple, and the cost can be effectively saved by adopting a plurality of conventional components.
Claims (9)
1. A voltage-limiting power supply circuit for supplying power to a system power supply chip, comprising:
the drain electrode of the NMOS tube is connected with a power supply, and an anti-reverse-filling circuit is connected between the power supply and the drain electrode of the NMOS tube;
the voltage dividing circuit is connected with the NMOS tube and used for dividing the voltage output by the power supply so as to reduce the output voltage of the NMOS tube;
the system power supply port is connected with the source electrode of the NMOS tube and is used for providing a direct current power supply after voltage reduction;
Wherein, the NMOS tube works in the variable resistance region after being connected with a power supply;
the voltage dividing circuit comprises a first voltage dividing unit;
the first voltage dividing unit comprises a first resistor and a second resistor which are connected in series, wherein the first end of the first resistor is connected with the drain electrode of the NMOS tube, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
the grid electrode of the NMOS tube is connected between the first resistor and the second resistor; the voltage dividing circuit further comprises a second voltage dividing unit;
The second voltage division unit comprises a third resistor and a fourth resistor which are connected in series, wherein the first end of the third resistor is connected with the source electrode of the NMOS tube, the second end of the third resistor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
2. The voltage-limited power supply circuit of claim 1, further comprising: the system power supply chip is arranged between the NMOS tube and the system power supply port;
The input end of the system power supply chip is connected with the source electrode of the NMOS tube and the first end of the third resistor, and the output end of the system power supply chip is connected with the system power supply port;
the enabling end of the system power chip is connected between the third resistor and the fourth resistor.
3. The voltage-limiting power supply circuit of claim 1, wherein,
The anti-reverse-filling circuit comprises a first diode and a fifth resistor, wherein the positive electrode of the first diode is connected with the power supply, and the negative electrode of the first diode is connected with the drain electrode of the NMOS tube;
the fifth resistor is connected in parallel with two ends of the first diode.
4. The voltage-limited power supply circuit of claim 1, further comprising a second zener diode;
And two ends of the second zener diode are connected between the grid electrode and the source electrode of the NMOS tube.
5. The voltage-limiting power supply circuit of claim 4, wherein the second zener diode is a bidirectional zener diode having a voltage-stabilizing value not exceeding a withstand voltage value between the gate and the source of the NMOS transistor.
6. The voltage-limiting power supply circuit according to any one of claims 2 to 5, further comprising: an input filter capacitor and/or an output filter capacitor;
one end of the input filter capacitor is connected with the input end of the system power chip, and the other end of the input filter capacitor is grounded;
one end of the output filter capacitor is connected with the output end of the system power chip, and the other end of the output filter capacitor is grounded.
7. The voltage-limiting power supply circuit according to any one of claims 2 to 5, further comprising: a sixth resistor;
The sixth resistor is connected between the source electrode of the NMOS tube and the input end of the system power supply chip.
8. An electronic device, comprising: a microprocessor, and a voltage-limited power supply circuit for reducing power consumption as defined in any one of claims 1 to 7;
And a system power supply port in the voltage limiting power supply circuit is connected with the microprocessor and is used for providing a step-down direct current power supply for the microprocessor.
9. The electronic device of claim 8, wherein the electronic device is an unmanned aerial vehicle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810724376.5A CN108649663B (en) | 2018-07-04 | 2018-07-04 | Voltage-limiting power supply circuit and electronic equipment |
| PCT/CN2019/092784 WO2020007216A1 (en) | 2018-07-04 | 2019-06-25 | Voltage-limiting power supply circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810724376.5A CN108649663B (en) | 2018-07-04 | 2018-07-04 | Voltage-limiting power supply circuit and electronic equipment |
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| CN108649663A CN108649663A (en) | 2018-10-12 |
| CN108649663B true CN108649663B (en) | 2024-05-17 |
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| CN108649663B (en) * | 2018-07-04 | 2024-05-17 | 深圳市道通智能航空技术股份有限公司 | Voltage-limiting power supply circuit and electronic equipment |
| CN110474529B (en) * | 2019-08-06 | 2024-09-17 | 深圳市道通智能航空技术股份有限公司 | Power supply circuit, battery and aircraft |
| CN111181389A (en) * | 2020-02-19 | 2020-05-19 | 东风电子科技股份有限公司 | Power supply voltage reduction circuit and corresponding control system |
| CN112117819B (en) * | 2020-09-09 | 2025-05-02 | 华大恒芯科技有限公司 | Battery-free power supply method and circuit |
| CN111934397B (en) * | 2020-09-17 | 2021-01-15 | 苏州赛芯电子科技有限公司 | Power supply circuit and electronic equipment |
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| CN103078370A (en) * | 2012-12-28 | 2013-05-01 | 昌辉汽车电气系统（安徽）有限公司 | Power module of automobile intelligent switch |
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| CN204668914U (en) * | 2015-05-19 | 2015-09-23 | 中国兵器工业集团第二一四研究所苏州研发中心 | Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off |
| CN208874303U (en) * | 2018-07-04 | 2019-05-17 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
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| CN202721609U (en) * | 2012-06-05 | 2013-02-06 | 新宝电机(东莞)有限公司 | A Multi-output Voltage Limiting Circuit for Flyback Switching Power Supply |
| CN108649663B (en) * | 2018-07-04 | 2024-05-17 | 深圳市道通智能航空技术股份有限公司 | Voltage-limiting power supply circuit and electronic equipment |
-
2018
- 2018-07-04 CN CN201810724376.5A patent/CN108649663B/en active Active
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2019
- 2019-06-25 WO PCT/CN2019/092784 patent/WO2020007216A1/en not_active Ceased
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|---|---|---|---|---|
| KR100860976B1 (en) * | 2007-06-27 | 2008-09-30 | 주식회사 하이닉스반도체 | Power up signal generator |
| CN103078370A (en) * | 2012-12-28 | 2013-05-01 | 昌辉汽车电气系统（安徽）有限公司 | Power module of automobile intelligent switch |
| CN203788531U (en) * | 2014-04-30 | 2014-08-20 | 广东瑞德智能科技股份有限公司 | Silicon controlled rectifier dimming LED power ripple suppression circuit |
| CN204668914U (en) * | 2015-05-19 | 2015-09-23 | 中国兵器工业集团第二一四研究所苏州研发中心 | Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off |
| CN208874303U (en) * | 2018-07-04 | 2019-05-17 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020007216A1 (en) | 2020-01-09 |
| CN108649663A (en) | 2018-10-12 |
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