CN108390365A - A kind of power supply unidirectional current control circuit - Google Patents
A kind of power supply unidirectional current control circuit Download PDFInfo
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- CN108390365A CN108390365A CN201810164064.3A CN201810164064A CN108390365A CN 108390365 A CN108390365 A CN 108390365A CN 201810164064 A CN201810164064 A CN 201810164064A CN 108390365 A CN108390365 A CN 108390365A
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- oxide
- semiconductor
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- electricity consumption
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of power supply unidirectional current control circuits, including power module and electricity consumption module, it is connected with metal-oxide-semiconductor between power module and electricity consumption module, the anode of the drain D connection power module of metal-oxide-semiconductor, the anode of the source S connection electricity consumption module of metal-oxide-semiconductor, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.Circuit overall power is low, is applicable to high-power electricity consumption occasion, and conducive to miniaturization, board area is small.
Description
Technical field
The invention belongs to electroporation fields, and in particular to a kind of power supply unidirectional current control circuit.
Background technology
As shown in Figure 1, the error situation of following reverse power connection often occurs during actual circuit uses.It is this
In the case of, if electricity consumption module be not protected, electrical equipment will be damaged.This just needs a simple and effective power supply list
Electrical equipment is protected to current control circuit.
Most power supply unidirectional current control circuits at present are as shown in Fig. 2, unidirectionally leading for diode is utilized in the circuit
The one-way flow of electric current electrically is controlled, to achieve the purpose that protect electricity consumption module.This circuit has the following disadvantages：
(1) power consumption is too big, and after having pressure drop, electric current to rise on diode, the dissipated power of diode will be notable
Increase；
(2) since heavy-duty diode model is seldom, large-power occasions can not be applied to；
(3) area of integrated circuit can be bigger, is unfavorable for the miniaturization of product.
Invention content
In order to solve the above problem of the existing technology, present invention aims at provide a kind of power supply unidirectional current control
Circuit, circuit overall power is low, is applicable to high-power electricity consumption occasion, and conducive to miniaturization, board area is small.
The technical solution adopted in the present invention is：A kind of power supply unidirectional current control circuit, including power module and electricity consumption
Module is connected with metal-oxide-semiconductor between power module and electricity consumption module, the drain D of metal-oxide-semiconductor connects the anode of power module, metal-oxide-semiconductor
Source S connects the anode of electricity consumption module, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Further, Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
Further, the Zener voltage of the Zener is less than the source S voltage of metal-oxide-semiconductor.
Further, current limliting is equipped between the Zener and power module cathode and the connecting node of electricity consumption module negative
Resistance.
Further, the conducting voltage of the parasitic diode between the metal-oxide-semiconductor drain D and source S is 0.8V.
Further, the metal-oxide-semiconductor is PMOS tube.
Its operation principle is as follows：
It controls and switchs as unidirectional current present invention utilizes the parasitic diode of field-effect tube, and field-effect is utilized
The characteristic of the conduct current in either direction of pipe is used as low-ohmic switches.
Circuit analysis is as follows：
Under correct connection, the grid G of PMOS tube and source S voltage are all 0 (Vgs 0) when just powering on, this
When PMOS tube turn off.But diode D3 parasitic at this time can be connected, with the injection of conducting electric current, the source S of PMOS tube
Voltage starts to increase, and is finally reached the voltage of Vin-0.8V (conduction voltage drop of D3 is 0.8V).Select the Zener electricity of Zener D4
Vz is pressed to be less than Vs (the source S voltage of PMOS tube), the gate source voltage Vgs of PMOS tube at this time is equal to-Vz.This when PMOS
Pipe is connected.Electric current after being connected due to field-effect tube can be two-way, and reverse current at this time has no effect on leading for pipe
Logical characteristic.Again since pipe turns on, and conducting resistance very little, the electric current of source S is flowed to parasitic diode from drain D
Short circuit current, so there is no electric currents for parasitic diode when normal work.Pressure drop in entire conduction path is only imitated with field
Should pipe conducting resistance it is related.
If power supply is reversed, the grid G of PMOS tube is high level, and field-effect tube is not turned on, and parasitic diode
D3 is also not turned on.Entirely play the effect for preventing electric current reversed.
There are two the effects of current-limiting resistance R：First, limiting electric current after the breakdown failure of PMOS tube, protection power source is played
With the effect of electricity consumption module；Second is that remaining voltage, i.e. Vin-0.8-Vz after Zener D4 voltage stabilizings are assumed responsibility for, so that Zener
Pipe can normal voltage stabilizing.
Beneficial effects of the present invention are：Power supply unidirectional current control circuit provided by the invention, mainly by field-effect tube, electricity
Resistance and regulator tube group at；Its circuit power consumption is extremely low, is suitble to high-power applications scene, after being connected due to PMOS tube, the work(on access
Consumption is only related to the conducting resistance of PMOS tube, as long as reaching very low consumption using the PMOS tube of a ultralow conducting resistance
Power is dissipated, and modern MOS techniques, the PMOS tube of milliohm rank conducting resistance are very universal；Circuit overall cost is low
It is honest and clean；Circuit entire area very little, the PMOS tube of low on-resistance is small, so circuit overall volume can accomplish very little.
Description of the drawings
Fig. 1 is reverse power connection schematic diagram；
Fig. 2 is traditional power supply unidirectional current electric operation control circuit figure；
Fig. 3 is power supply unidirectional current electric operation control circuit figure of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further elaborated.
Embodiment 1：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Embodiment 2：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
Embodiment 3：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
The Zener voltage of the Zener is less than the source S voltage of metal-oxide-semiconductor.
Embodiment 4：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
The Zener voltage of the Zener is less than the source S voltage of metal-oxide-semiconductor.
Current-limiting resistance is equipped between the Zener and power module cathode and the connecting node of electricity consumption module negative.
Embodiment 5：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
The Zener voltage of the Zener is less than the source S voltage of metal-oxide-semiconductor.
Current-limiting resistance is equipped between the Zener and power module cathode and the connecting node of electricity consumption module negative.
The conducting voltage of parasitic diode D3 between the metal-oxide-semiconductor drain D and source S is 0.8V.
Embodiment 6：
As shown in figure 3, a kind of power supply unidirectional current control circuit, including power module and electricity consumption module, power module and
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electricity consumption module, the source S of metal-oxide-semiconductor connects electricity consumption mould
The anode of block, the cathode of the cathode and electricity consumption module of the grid G connection power module of metal-oxide-semiconductor.
Zener is equipped between the grid G and source S of the metal-oxide-semiconductor.
The Zener voltage of the Zener is less than the source S voltage of metal-oxide-semiconductor.
Current-limiting resistance is equipped between the Zener and power module cathode and the connecting node of electricity consumption module negative.
The conducting voltage of parasitic diode D3 between the metal-oxide-semiconductor drain D and source S is 0.8V.
The metal-oxide-semiconductor is PMOS tube.
Operation principle is as follows：
It controls and switchs as unidirectional current present invention utilizes the parasitic diode of field-effect tube, and field-effect is utilized
The characteristic of the conduct current in either direction of pipe is used as low-ohmic switches.
Circuit analysis is as follows：
Under correct connection, the grid G of PMOS tube and source S voltage are all 0 (Vgs 0) when just powering on, this
When PMOS tube turn off.But diode D3 parasitic at this time can be connected, with the injection of conducting electric current, the source S of PMOS tube
Voltage starts to increase, and is finally reached the voltage of Vin-0.8V (conduction voltage drop of D3 is 0.8V).Select the Zener electricity of Zener D4
Vz is pressed to be less than Vs (the source S voltage of PMOS tube), the gate source voltage Vgs of PMOS tube at this time is equal to-Vz.This when PMOS
Pipe is connected.Electric current after being connected due to field-effect tube can be two-way, and reverse current at this time has no effect on leading for pipe
Logical characteristic.Again since pipe turns on, and conducting resistance very little, the electric current of source S is flowed to parasitic diode from drain D
Short circuit current, so there is no electric currents for parasitic diode when normal work.Pressure drop in entire conduction path is only imitated with field
Should pipe conducting resistance it is related.
If power supply is reversed, the grid G of PMOS tube is high level, and field-effect tube is not turned on, and parasitic diode
D3 is also not turned on.Entirely play the effect for preventing electric current reversed.
There are two the effects of current-limiting resistance R：First, limiting electric current after the breakdown failure of PMOS tube, protection power source is played
With the effect of electricity consumption module；Second is that remaining voltage, i.e. Vin-0.8-Vz after Zener D4 voltage stabilizings are assumed responsibility for, so that Zener
Pipe can normal voltage stabilizing.
Power supply unidirectional current control circuit provided by the invention, mainly by field-effect tube, resistance and regulator tube group at；Its electricity
Road power consumption is extremely low, is suitble to high-power applications scene, after being connected due to PMOS tube, the electric conduction of power consumption and PMOS tube on access
Resistance is related, as long as reaching very low dissipated power using the PMOS tube of a ultralow conducting resistance, and modern MOS works
The PMOS tube of skill, milliohm rank conducting resistance is very universal；Circuit overall cost is cheap；Circuit entire area very little,
The PMOS tube of low on-resistance is small, so circuit overall volume can accomplish very little.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is every to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (6)
1. a kind of power supply unidirectional current control circuit, it is characterised in that：Including power module and electricity consumption module, power module and use
Metal-oxide-semiconductor, the anode of the drain D connection power module of metal-oxide-semiconductor are connected between electric module, the source S of metal-oxide-semiconductor connects electricity consumption module
Anode, metal-oxide-semiconductor grid G connection power module cathode and electricity consumption module cathode.
2. power supply unidirectional current control circuit according to claim 1, it is characterised in that：The grid G of the metal-oxide-semiconductor and source
Zener is equipped between the S of pole.
3. power supply unidirectional current control circuit according to claim 2, it is characterised in that：The Zener voltage of the Zener
Less than the source S voltage of metal-oxide-semiconductor.
4. power supply unidirectional current control circuit according to claim 2, it is characterised in that：The Zener and power module
Current-limiting resistance is equipped between cathode and the connecting node of electricity consumption module negative.
5. power supply unidirectional current control circuit according to claim 1, it is characterised in that：The metal-oxide-semiconductor drain D and source electrode
The conducting voltage of parasitic diode between S is 0.8V.
6. power supply unidirectional current control circuit according to claim 1, it is characterised in that：The metal-oxide-semiconductor is PMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164064.3A CN108390365A (en) | 2018-02-27 | 2018-02-27 | A kind of power supply unidirectional current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164064.3A CN108390365A (en) | 2018-02-27 | 2018-02-27 | A kind of power supply unidirectional current control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108390365A true CN108390365A (en) | 2018-08-10 |
Family
ID=63070060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810164064.3A Pending CN108390365A (en) | 2018-02-27 | 2018-02-27 | A kind of power supply unidirectional current control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108390365A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2836301Y (en) * | 2005-08-28 | 2006-11-08 | 华为技术有限公司 | Reverse connection prevention circuit for power supply |
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN202917976U (en) * | 2012-10-31 | 2013-05-01 | 佛山市顺德区瑞德电子实业有限公司 | Protective device of solar energy LED power supply input polarity reversal connection |
| CN106208029A (en) * | 2016-08-31 | 2016-12-07 | 天津市鸿远电气股份有限公司 | Power supply is anti-connects circnit NOT |
-
2018
- 2018-02-27 CN CN201810164064.3A patent/CN108390365A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2836301Y (en) * | 2005-08-28 | 2006-11-08 | 华为技术有限公司 | Reverse connection prevention circuit for power supply |
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN202917976U (en) * | 2012-10-31 | 2013-05-01 | 佛山市顺德区瑞德电子实业有限公司 | Protective device of solar energy LED power supply input polarity reversal connection |
| CN106208029A (en) * | 2016-08-31 | 2016-12-07 | 天津市鸿远电气股份有限公司 | Power supply is anti-connects circnit NOT |
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Application publication date: 20180810 |