CN207743756U - Power supply switch circuit - Google Patents
Power supply switch circuit Download PDFInfo
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- CN207743756U CN207743756U CN201721923866.5U CN201721923866U CN207743756U CN 207743756 U CN207743756 U CN 207743756U CN 201721923866 U CN201721923866 U CN 201721923866U CN 207743756 U CN207743756 U CN 207743756U
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Abstract
The utility model is related to a kind of power supply switch circuits, including the power supply switch circuit being integrated on one piece of circuit board, the power supply switch circuit includes the first power circuit and second source circuit, and the power input and power output end being connect with first power circuit and second source circuit；First power circuit includes first resistor R1, second resistance R2, voltage-stabiliser tube ZA1, the first triode Q1, the second triode Q2 and metal-oxide-semiconductor QD01；The second source circuit includes the 8th resistance R8, third transistor Q3, thirteenth resistor R13, power connector end V_DEC and DC conversion module U1.The power supply switch circuit is linked together by the power output end of the first power circuit and second source circuit realizes that supply voltage switches not power down, also realizes two kinds of power supply power supplies.Power supply switch circuit design circuit is simple, manufacturing cost is low, highly practical.
Description
Technical field
The utility model is related to power supply power supply technical fields, and in particular, to power supply switch circuit.
Background technology
Currently on the market can be switched using multiple power sources product largely be use built-in exchange power conversion circuit, and
The interface of output end one DC power supply of parallel connection is realized.For example, have AC rectification circuit output 12V inside mobile TV,
Mobile TV output end again can parallel connection direct interface can connect the Vehicular accumulator cell of 12V；Some power supply product it is interior
Portion is using the special additional mating adapter of battery with the use of power supply, such as laptop, built-in specific 19V electricity
In addition pond also needs the adapter of mating 12V to use.Not only manufacturing cost height will also result in money to the power supply power supply scheme of this series
The waste in source.
Therefore, a kind of power supply switch circuit need to be provided, so as to solve the deficiencies in the prior art.
Utility model content
A kind of two kinds of different electrical power voltages switching not power down that in order to overcome the deficiencies of the prior art, the utility model provides
Power supply switch circuit.
The technical solution of the utility model is as follows：
A kind of power supply switch circuit, including the power supply switch circuit that is integrated on one piece of circuit board, the power supply switching electricity
Road includes the first power circuit and second source circuit, and the electricity being connect with first power circuit and second source circuit
Source input terminal and power output end；First power circuit includes first resistor R1, second resistance R2, voltage-stabiliser tube ZA1, first
Triode Q1, the second triode Q2 and metal-oxide-semiconductor QD01；The second source circuit include the 8th resistance R8, third transistor Q3,
Thirteenth resistor R13, power connector end V_DEC and DC conversion module U1.
Preferably, a power input IN is connect with first power circuit, the one end the first resistor R1 with it is described
Power input IN connections, the second resistance R2 connect after connecting with the voltage-stabiliser tube ZA1 with first resistor R1 described in the other end
It connects and is denoted as node A；The base stage of the first triode Q1 is connect with the node A, the emitter of the first triode Q1
It is connect with the power input IN, the collector of the first triode Q1 is connect with the grid of the metal-oxide-semiconductor QD01；It is described
The base stage of second triode Q2 is connect with the one end the voltage-stabiliser tube ZA1, the emitter of the second triode Q2 ground connection, and described the
One the 4th resistance R4 of collector series connection of two triode Q2 is connect with the source electrode of the metal-oxide-semiconductor QD01 or second triode
One the 5th resistance R5 and the 6th resistance R6 of collector series connection of Q2 is connect with the grid of the metal-oxide-semiconductor QD01；The metal-oxide-semiconductor QD01
Source electrode connect with the power input IN, the drain electrode of the metal-oxide-semiconductor QD01 is connect with a power output end OUT.Wherein, institute
It is PNP pipe to state the first triode Q1, and the second triode Q2 manages for NPN.
Preferably, the first resistor R1, the second resistance R2 and the voltage-stabiliser tube ZA1 connect to form partial pressure electricity
Road, described bleeder circuit one end are connect with the power input IN, one 3rd resistor R3 of bleeder circuit series connection described in the other end
Ground connection.Wherein, the voltage-stabiliser tube ZA1 is that first power circuit 100 plays clamping action so that the first electricity of the circuit
The resistance value adjustment of resistance R1 and second resistance R2 is accurately also convenient for.
Preferably, the voltage of the power input IN inputs is denoted as VIN, the conducting voltage of the voltage-stabiliser tube ZA1 is denoted as
VZA1, the resistance value of the first resistor R1 is denoted as R1, and the resistance value of the second resistance R2 is denoted as R2, the resistance of the 3rd resistor R3
Value is denoted as R3, and the conducting voltage of the first triode Q1 is denoted as VQ1, the conducting voltage of the second triode Q2 is denoted as VQ2。
Preferably, the conducting voltage of the first triode Q1 is：VQ1=VIN-(VIN-VZA1)*(R1+R2)/(R1+R2+R3)-
VZA1。
Preferably, the conducting voltage of the second triode Q2 is：VQ2=(VIN-VZA1)*(R3/(R1+R2+R3))。
Preferably, the voltage range values of the power input IN are 4.5V~5.5V.
Preferably, a power input IN ' is connect with the second source circuit, the power input IN ' respectively with
The pin 3 of the 8th resistance R8 and the DC conversion modules U1 connect, the 8th resistance R8 and third transistor Q3
One the 9th resistance R9 ground connection of base stage connection or the 8th resistance R8 series connection；The emitter of the third transistor Q3 with
Power input IN ' the connections, the collector series connection thirteenth resistor R13 and the power supply of the third transistor Q3
Connecting pin V_DEC；The pin 5 of power connector end V_DEC 1 the 16th resistance R16 of the series connection and DC conversion modules U1 connects
It connects, the pin 2 of the DC conversion modules U1 connects a third inductance L3 and connect with the power output end OUT.
Preferably, the voltage of the power input IN ' inputs is 4V~20V.
Preferably, the voltage of the power input IN ' inputs is denoted as VIN′, the resistance value of the 8th resistance R8 is denoted as R8,
The resistance value of the 9th resistance R9 is denoted as R9, and the conducting voltage of the third transistor Q3 is denoted as VQ3。
Preferably, the conducting voltage of the third transistor Q3 is：VQ3=VIN′-VIN′*R9/(R8+R9)。
The beneficial effects of the utility model are：Compared with prior art, which passes through the first triode,
The height electricity that two triodes are realized the output of supply voltage or exported using third transistor control power connector end with metal-oxide-semiconductor
Ordinary mail number controls the output that DC conversion modules realize supply voltage；The power output end of first power circuit and second source circuit
It links together and realizes supply voltage switching not power down, also realize two kinds of power supply power supplies.The power supply switch circuit designs circuit letter
List, manufacturing cost are low, highly practical.
Description of the drawings：
Fig. 1 is the circuit diagram of power supply switch circuit described in the utility model.
Specific implementation mode
In order to make the goal of the invention of the utility model, technical solution and technique effect are more clearly understood, with reference to tool
Body embodiment is described further the utility model.It should be understood that specific embodiment described herein, be only used for explaining
The utility model is not used to limit the utility model.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with the technology for belonging to the utility model
The normally understood meaning of technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more relevant Listed Items.
Referring to Fig.1, the power supply switch circuit of the utility model, including the power supply switching being integrated on one piece of circuit board are electric
Road, the power supply switch circuit include the first power circuit 100 and second source circuit 200, and electric with first power supply
The power input and power output end that road 100 and second source circuit 200 connect；The power supply of first power circuit 100
The power output end of output end and the second source circuit 200 connects.
Referring to Fig.1, a power input IN is connect with first power circuit 100, and first power circuit 100 wraps
Include first resistor R1, second resistance R2, voltage-stabiliser tube ZA1, the first triode Q1, the second triode Q2 and metal-oxide-semiconductor QD01；Described
One one end resistance R1 is connect with the power input IN, the second resistance R2 connect with the voltage-stabiliser tube ZA1 after with it is another
It holds the first resistor R1 to connect and is denoted as node A；The base stage of the first triode Q1 is connect with the node A, and described
The emitter of one triode Q1 is connect with the power input IN, collector and the metal-oxide-semiconductor of the first triode Q1
The grid of QD01 connects；The base stage of the second triode Q2 is connect with the one end the voltage-stabiliser tube ZA1, the second triode Q2
Emitter ground connection, the connect source electrode of one the 4th resistance R4 and metal-oxide-semiconductor QD01 of the collector of the second triode Q2 connects
Connect or the collector of the second triode Q2 connect one the 5th resistance R5 and the 6th resistance R6 and the metal-oxide-semiconductor QD01 grid
Pole connects；The source electrode of the metal-oxide-semiconductor QD01 is connect with the power input IN, drain electrode and a power supply of the metal-oxide-semiconductor QD01
Output end OUT connections.Wherein, the first triode Q1 is PNP pipe, and the model of the first triode Q1 is preferably 3906；
The second triode Q2 manages for NPN, and the model of the second triode Q2 is preferably 3904.
Referring to Fig.1, the first resistor R1, the second resistance R2 and the voltage-stabiliser tube ZA1 connect to form partial pressure electricity
Road, described bleeder circuit one end are connect with the power input IN, one 3rd resistor R3 of bleeder circuit series connection described in the other end
Ground connection.The voltage-stabiliser tube ZA1 is that first power circuit 100 plays clamping action so that the first resistor R1 of the circuit
Resistance value adjustment with second resistance R2 is accurately also convenient for.
Referring to Fig.1, the operation principle of first power circuit 100 is：When the voltage in the sources the power input IN is defeated
Fashionable, first resistor R1, second resistance R2,3rd resistor R3 and the voltage-stabiliser tube ZA1 that voltage passes through in the bleeder circuit are carried out
Divide and provide voltage to the first triode Q1 and the second triode Q2, cause the first triode Q1 and the second triode Q2 conductings from
And control the on or off of metal-oxide-semiconductor QD01.When the first triode Q1 conductings, voltage is simultaneously by the grid of metal-oxide-semiconductor QD01
With source level, two step voltages are identical, and metal-oxide-semiconductor QD01 is not turned on, and non-transformer voltage is exported from power output end OUT；When the two or three pole
When pipe Q2 conducting, the emitter conducting ground connection of the second triode Q2 and the output of its collector terminal are that low level is equivalent to metal-oxide-semiconductor
The grid of QD01 is pulled to low level, and metal-oxide-semiconductor QD01 conductings, supply voltage are exported from power output end OUT.
Specifically, when the brownout of power input IN input, flowing through the voltage of second resistance R2 relatively low can not drive
Dynamic second triode Q2 conductings, cause metal-oxide-semiconductor QD01 to be not turned on non-transformer voltage and are exported from power output end OUT；When power supply is defeated
When the overtension for entering to hold IN to input, the voltage and its source level of the gate terminal of input metal-oxide-semiconductor QD01 after the first triode Q1 conductings
The voltage at end is identical, and metal-oxide-semiconductor QD01 is caused to be exported from power output end OUT in also non-transformer voltage is not turned on；Only in electricity
The voltage of source input terminal IN inputs is less than the first triode Q1 conducting voltages, and can meet the conducting voltage of the second triode Q2,
There is supply voltage to be exported from power output end OUT to control metal-oxide-semiconductor QD01 conductings.
The voltage of the power input IN inputs is denoted as VIN, the conducting voltage of the voltage-stabiliser tube ZA1 is denoted as VZA1, described
The resistance value of first resistor R1 is denoted as R1, and the resistance value of the second resistance R2 is denoted as R2, and the resistance value of the 3rd resistor R3 is denoted as R3,
The conducting voltage of the first triode Q1 is denoted as VQ1, the conducting voltage of the second triode Q2 is denoted as VQ2。
The conducting voltage of first triode Q1 is：
VQ1=VIN-(VIN-VZA1)*(R1+R2)/(R1+R2+R3)-VZA1。
The conducting voltage of second triode Q2 is：
VQ2=(VIN-VZA1)*(R3/(R1+R2+R3))。
In this embodiment, the voltage range values of the power input IN are 4.5V~5.5V, the power input IN
Voltage be in 4.5V hereinafter, the first triode Q1 and the second triode Q2 are in cut-off state, and metal-oxide-semiconductor QD01 is in and cuts
Only state, the power output end OUT non-transformer voltage outputs；The voltage of the power input IN be in voltage 5.5V with
On, the first triode Q1 and the second triode Q2 are in conducting state, and the voltage of the gate terminal of metal-oxide-semiconductor QD01 and source level end
Identical cause is at cut-off state, the power output end OUT non-transformer voltage outputs；The voltage of the power input IN
In between 4.5V~5.5V, the first triode Q1 is in cut-off state, the second triode Q2 conductings, and metal-oxide-semiconductor QD01 is connected,
There are supply voltage outputs by the power output end OUT.
Referring to Fig.1, a power input IN ' is connect with the second source circuit 200, the second source circuit 200
Including the 8th resistance R8, third transistor Q3, thirteenth resistor R13, power connector end V_DEC and DC conversion module U1；It is described
Power input IN ' is connect with the pin 3 of the 8th resistance R8 and the DC conversion modules U1 respectively, the 8th resistance R8
It is connect with the base stage of the third transistor Q3 or one the 9th resistance R9 of the 8th resistance R8 series connection is grounded；The third
The emitter of triode Q3 is connect with the power input IN ', the collector series connection the described tenth of the third transistor Q3
The three resistance R13 and power connector end V_DEC；Power connector end V_DEC 1 the 16th resistance R16 of the series connection and DC
The pin 5 of conversion module U1 connects, and the pin 2 of the DC conversion modules U1 connects a third inductance L3 and the power output end
OUT connections.Wherein, the third transistor Q3 is PNP pipe, and the model of the third transistor Q3 is preferably 3906；The DC
Conversion module is preferably the DC chips of Width funtion.In the present embodiment, the battery or adaptive charging of the power input IN ' connections
The voltage of device, the power input IN ' inputs is 4V~20V.
The operation principle of the second source circuit 200 is：The voltage control described the of the power input IN ' inputs
Three triode Q3 on or off so that the high level signal or low level signal of power connector end V_DEC output from
And control the DC conversion modules U1 and whether work, when the voltage of the power input IN ' inputs is less than 4V, the third
Triode Q3 is in cut-off state, and the power connector end V_DEC outputs are low level signal, then the DC conversion modules U1
It does not work.When the voltage of the power input IN ' inputs is higher than 4V, the third transistor Q3 is in the conduction state, institute
It is that high level signal triggers the DC conversion modules U1 operations work to state power connector end V_DEC outputs.
The voltage of the power input IN ' inputs is denoted as VIN′, the resistance value of the 8th resistance R8 is denoted as R8, and described
The resistance value of nine resistance R9 is denoted as R9, and the conducting voltage of the third transistor Q3 is denoted as VQ3。
The conducting voltage of the third transistor Q3 is：
VQ3=VIN′-VIN′*R9/(R8+R9)。
The utility model realizes the output or use of supply voltage by the first triode, the second triode with metal-oxide-semiconductor
Third transistor controls the output of the low and high level signal control DC conversion modules realization supply voltage of power connector end output；The
The power output end of one power circuit and second source circuit, which links together, realizes supply voltage switching not power down, also realizes two
Kind power supply power supply.Power supply switch circuit design circuit is simple, manufacturing cost is low, highly practical.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, architectural form cans be flexible and changeable, and can be produced with subseries
Product.Several simple deduction or replace are only made, it is true by the claims submitted all to shall be regarded as belonging to the utility model
Fixed scope of patent protection.
Claims (8)
1. a kind of power supply switch circuit, it is characterised in that：Including the power supply switch circuit being integrated on one piece of circuit board, the electricity
Source switching circuit include the first power circuit and second source circuit, and with first power circuit and second source circuit
The power input and power output end of connection；First power circuit includes first resistor (R1), second resistance (R2), steady
Pressure pipe (ZA1), the first triode (Q1), the second triode (Q2) and metal-oxide-semiconductor (QD01)；The second source circuit includes the 8th
Resistance (R8), third transistor (Q3), thirteenth resistor (R13), power connector end (V_DEC) and DC conversion modules (U1).
2. power supply switch circuit according to claim 1, which is characterized in that a power input IN and first power supply
Circuit connects, and described first resistor one end (R1) connect with the power input (IN), the second resistance (R2) with it is described
It is connect with first resistor described in the other end (R1) after voltage-stabiliser tube (ZA1) series connection and is denoted as node (A)；First triode (Q1)
Base stage connect with the node (A), the emitter of first triode (Q1) is connect with the power input (IN), institute
The collector for stating the first triode (Q1) is connect with the grid of the metal-oxide-semiconductor (QD01)；The base stage of second triode (Q2)
It is connect with the one end the voltage-stabiliser tube (ZA1), the emitter ground connection of second triode (Q2), second triode (Q2)
Collector one the 4th resistance (R4) of series connection is connect with the source electrode of the metal-oxide-semiconductor (QD01) or the collection of second triode (Q2)
Electrode one the 5th resistance (R5) of series connection and the 6th resistance (R6) are connect with the grid of the metal-oxide-semiconductor (QD01)；The metal-oxide-semiconductor
(QD01) source electrode is connect with the power input (IN), drain electrode and the power output end (OUT) of the metal-oxide-semiconductor (QD01)
Connection.
3. power supply switch circuit according to claim 1 or 2, which is characterized in that the first resistor (R1), described second
Resistance (R2) and the voltage-stabiliser tube (ZA1) series connection form a bleeder circuit, described bleeder circuit one end and the power input
(IN) it connects, bleeder circuit one 3rd resistor of series connection (R3) described in the other end is grounded.
4. power supply switch circuit according to claim 2, which is characterized in that a power input IN ' and second electricity
Source circuit connects, and the power input (IN ') is drawn with the 8th resistance (R8) and DC conversion modules (U1) respectively
Foot (3) connects, and the 8th resistance (R8) is connect with the base stage of the third transistor (Q3) or the 8th resistance (R8)
One the 9th resistance (R9) of connecting is grounded；The emitter of the third transistor (Q3) is connect with the power input (IN '), institute
State the collector series connection thirteenth resistor (R13) and the power connector end (V_DEC) of third transistor (Q3)；The electricity
Source connection (V_DEC) 1 the 16th resistance (R16) of series connection is connect with the pin (5) of the DC conversion modules (U1), the DC
The pin (2) of conversion module (U1) connects a third inductance (L3) and is connect with the power output end (OUT).
5. power supply switch circuit according to claim 2, which is characterized in that the voltage range of the power input (IN)
Value is 4.5V~5.5V.
6. power supply switch circuit according to claim 4, which is characterized in that the electricity of power input (IN ') input
Pressure is 4V~20V.
7. power supply switch circuit according to claim 3, which is characterized in that the voltage of power input (IN) input
It is denoted as VIN, the conducting voltage of the voltage-stabiliser tube (ZA1) is denoted as VZA1, the resistance value of the first resistor (R1) is denoted as R1, and described second
The resistance value of resistance (R2) is denoted as R2, and the resistance value of the 3rd resistor (R3) is denoted as R3, the electric conduction of first triode (Q1)
Pressure is denoted as VQ1, the conducting voltage of second triode (Q2) is denoted as VQ2；The conducting voltage of first triode (Q1) is：VQ1=
VIN-(VIN-VZA1)*(R1+R2)/(R1+R2+R3)-VZA1；The conducting voltage of second triode Q2 is：VQ2=(VIN-VZA1)*
(R3/(R1+R2+R3))。
8. power supply switch circuit according to claim 4, which is characterized in that the electricity of power input (IN ') input
Pressure is denoted as VIN′, the resistance value of the 8th resistance (R8) is denoted as R8, and the resistance value of the 9th resistance (R9) is denoted as R9, the third
The conducting voltage of triode (Q3) is denoted as VQ3；The conducting voltage of the third transistor (Q3) is：VQ3=VIN′-VIN′*R9/(R8
+R9)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721923866.5U CN207743756U (en) | 2017-12-28 | 2017-12-28 | Power supply switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721923866.5U CN207743756U (en) | 2017-12-28 | 2017-12-28 | Power supply switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207743756U true CN207743756U (en) | 2018-08-17 |
Family
ID=63121347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721923866.5U Active CN207743756U (en) | 2017-12-28 | 2017-12-28 | Power supply switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207743756U (en) |
-
2017
- 2017-12-28 CN CN201721923866.5U patent/CN207743756U/en active Active
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