CN109256939A - Current selecting circuit and driving circuit - Google Patents
Current selecting circuit and driving circuit Download PDFInfo
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- CN109256939A CN109256939A CN201710566052.9A CN201710566052A CN109256939A CN 109256939 A CN109256939 A CN 109256939A CN 201710566052 A CN201710566052 A CN 201710566052A CN 109256939 A CN109256939 A CN 109256939A
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
Abstract
The application provides a kind of current selecting circuit and driving circuit, gear of the current selecting circuit according to the resistance value selection output electric current of preset electric current selection resistance, current selecting circuit has input terminal and output end, input terminal is connect with electric current selection resistance, output end is connect with supply convertor, the current selecting circuit selects the resistance value of resistance according to the electric current, it connect the resistance with predetermined resistance corresponding with the output gear of electric current with the supply convertor via the output end, the supply convertor exports electric current according to the selected resistance of the current selecting circuit.According to the application, flexible electric current selection can be carried out, also, the quantity of the input terminal of electric current selection device will not increase with the increase of the numbers of gear steps of output electric current.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of current selecting circuit and with the current selecting circuit
Driving circuit.
Background technique
When being driven using driving circuit to electronic equipment, user is sometimes for adjusting the drive that is exported of driving circuit
The size of streaming current, this requires driving circuits to have the function of electric current selection.
In existing driving circuit, digital integrated electronic circuit (digital IC) can be set to realize the function of electric current selection
Can, which can export different current selection signals by 2 ports.
In existing driving circuit, analog circuit can be set also to realize the function of electric current selection, the analog circuit
Multiple output ports be can have to export different current selection signals, so that driving circuit be made to export different size of electricity
Stream.
It should be noted that the above description of the technical background be intended merely to it is convenient to the technical solution of the application carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Cannot merely because these schemes the application's
Background technology part is expounded and thinks that above-mentioned technical proposal is known to those skilled in the art.
Summary of the invention
The inventors of the present application found that in the existing skill for realizing electric current selection function by setting digital integrated electronic circuit
In art, what digital integrated electronic circuit exported is the current selection signal of DC form, realizes the higher cost of electric current selection；Existing
By in technology of the setting analog circuit to realize electric current selection function, if the quantity of the electric current to be exported selection gear increases
It is more, then the quantity of the output port of the analog circuit will also increase.
The embodiment of the present application provides a kind of current selecting circuit and driving circuit, is connected to current selecting circuit by changing
Input terminal electric current selection resistance resistance value, to adjust the resistance value for the resistance for being linked into supply convertor, so as to adjust
The current value for the electric current that the supply convertor is exported, thus, it is possible to carry out flexible electric current selection, also, electric current selection electricity
The quantity of the output port on road not will increase.
According to the embodiment of the present application, a kind of current selecting circuit is provided, which selects according to preset electric current
The gear of the resistance value selection output electric current of resistance is selected, the current selecting circuit has input terminal and output end, the input terminal
It is connect with electric current selection resistance, the output end is connect with supply convertor (power converter), the electric current choosing
The resistance value that circuit selects resistance according to the electric current is selected, is made corresponding with the output gear of electric current with predetermined resistance
Resistance connect via the output end with the supply convertor, the supply convertor is according to the current selecting circuit institute
The resistance output of selection corresponds to the electric current (current) of the gear.
The beneficial effect of the embodiment of the present application is: the electric current choosing of the input terminal of current selecting circuit is connected to by changing
The resistance value of resistance is selected, to adjust the resistance value for the resistance for being linked into supply convertor, institute is defeated so as to adjust the supply convertor
The current value of electric current out, thus, it is possible to carry out flexible electric current selection, also, the number of the output port of current selecting circuit
Amount not will increase.
Referring to following description and accompanying drawings, only certain exemplary embodiments of this invention is disclosed in detail, specifies original of the invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, embodiments of the present invention include many changes, modifications and are equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
Included attached drawing is used to provide to be further understood from the embodiment of the present invention, and which constitute one of specification
Point, for illustrating embodiments of the present invention, and come together to illustrate the principle of the present invention with verbal description.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying wound
Under the premise of the property made is laborious, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a schematic diagram of the current selecting circuit of the embodiment of the present application 1；
Fig. 2 is a schematic diagram of the supply convertor collocation current selecting circuit of the embodiment of the present application 2.
Specific embodiment
Referring to attached drawing, by following specification, aforementioned and other feature of the invention be will be apparent.In specification
In attached drawing, only certain exemplary embodiments of this invention is specifically disclosed, which show the portions that can wherein use principle of the invention
Divide embodiment, it will thus be appreciated that the present invention is not limited to described embodiments, on the contrary, the present invention includes falling into appended power
Whole modifications, modification and equivalent in the range of benefit requirement.
Embodiment 1
The embodiment of the present application 1 provides a kind of electric current selection device.Fig. 1 is a schematic diagram of the current selecting circuit.
As shown in Figure 1, the electric current selection device 100 can have preset electric current selection resistance 101 and electric current selection electricity
Road 102, current selecting circuit 102 can select the gear of the resistance value selection output electric current of resistance 101 according to electric current.
In the present embodiment, current selecting circuit 102 can have input terminal and output end, and the input terminal and electric current select
Resistance 101 connects, which connect with supply convertor (power converter).
In the present embodiment, current selecting circuit 102 can select the resistance value of resistance 101 according to electric current, make defeated with this
The corresponding resistance with predetermined resistance of the gear of electric current is connect via the output end with supply convertor 200 out；The power supply
Converter 200 can export corresponding electric current (current) according to the selected resistance of current selecting circuit 102.
In the present embodiment, supply convertor 200 can have current controling end 201, the current controling end 201 and ground connection
Resistance value between end can control the driving current value of the supply convertor 200 output.In one embodiment, electric current control
Current sensing resistor 2011 (current sense resister), the electric current are can connect between end 201 processed and ground terminal
The selected resistance of selection circuit 102 can be in parallel with current sensing resistor 2011, as a result, by adjusting current selecting circuit
The resistance value of the electric current selection resistance 101 of 102 input terminals, the electricity of the adjustable selected resistance of current selecting circuit 102
Resistance value, and then the resistance value between the current controling end 201 and ground terminal of adjustment supply convertor 200, so as to adjust power supply change
The output current value of parallel operation 200.
According to the present embodiment, the resistance of the electric current selection resistance of the input terminal of current selecting circuit is connected to by changing
Value, to adjust the resistance value for the resistance for being linked into supply convertor, so as to adjust the electricity for the electric current that the supply convertor is exported
Flow valuve, thus, it is possible to flexible electric current selection be carried out, for example, the resistance value of electric current selection resistance can be at any time with sinusoidal bent
Line variation, the driving current that supply convertor 200 is exported as a result, can also be at any time with sinusoidal variation, to improve
The flexibility of electric current selection；Also, the quantity of the output port of current selecting circuit not will increase.
In the present embodiment, input voltage can be converted driving current output, the driving electricity of output by supply convertor 200
The value of stream can be by the control of the resistance value between current controling end 201 and ground terminal.About supply convertor 200 structure and
Working principle can refer to the prior art.
For example, to can have rectification circuit, smooth circuit, switch element, transformer, outlet side whole for supply convertor 200
Current circuit and central controller etc., wherein rectification circuit and smooth circuit can carry out rectification peace to the alternating current of input
It is sliding；The central controller can have ON/OFF control port, which can export control letter
Number, with the turn-on and turn-off of control switch element, so that smoothed out electric signal be made to carry out resonance；Transformer makes the telecommunications of resonance
Number it is transported to the outlet side of Switching Power Supply；The electric signal that outlet side rectification circuit will be delivered to the outlet side of Switching Power Supply carries out
Rectification, to form driving current and export.The central controller can also have a control port, i.e. supply convertor 200
Current controling end 201, the resistance value between the control port and ground terminal can control the driving of the output of supply convertor 200
Current value.
In the following, being described with reference to the accompanying drawings the structure and working principle of electric current selection device 100.
As shown in Figure 1, current selecting circuit 102 can have two terminals X1 and X2, the output of current selecting circuit 102
End can have two terminals X3 and X4, wherein terminal X2 and terminal X4 can connect with the ground terminal of electric current selection device 100
It connects.It can connect electric current selection resistance 101 between terminal X1 and X2, terminal X3 can be with the current control of supply convertor 200
201 connection of end.
In the present embodiment, as shown in Figure 1, current selecting circuit 102 can have divider resistance R1, electric current selects resistance
101 and divider resistance R1 is connected in series between the power end Vcc of current selecting circuit and ground terminal, by adjusting electric current selection
The resistance value of resistance 101 can adjust the voltage value at electric current selection 101 both ends of resistance.
In the present embodiment, current selecting circuit 102 can also have at least one current sensing resistor string, in Fig. 1,
Show 4 current sensing resistor strings 1021,1022,1023 and 1024.
In the present embodiment, each current sensing resistor string is connect with output end, for example, each current sensing resistor string
1021, between the terminal X3 and X4 of 1022,1023 and 1024 output ends for being parallel to current selecting circuit 102.
In the present embodiment, each current sensing resistor string may have concatenated first switching element and first resistor,
Whether the first switching element that electric current selection resistance 101 controls in each current sensing resistor string is connected.For example, current sensing resistor
String 1021 has first switching element Q1 and first resistor R2, and current sensing resistor string 1022 has first switching element Q2 and the
One resistance R3, current sensing resistor string 1023 have first switching element Q3 and first resistor R4, current sensing resistor string 1024
With first switching element Q4 and first resistor R5.In the present embodiment, first switching element can be metal oxide and partly lead
Body field effect transistor (MOSFET), such as N-type MOSFET, are also possible to other types of switch element.
In the present embodiment, when the conducting of the first switching element of a certain current sensing resistor string, the current sensing resistor
The first resistor of string via output end by access supply convertor 200, for example, the first resistor is connected to supply convertor
It is in parallel with current sensing resistor 2011 between 200 current controling end 201 and ground terminal.
In the present embodiment, the resistance value of the first resistor of each current sensing resistor string can be different from each other, works as difference as a result,
First switching element conducting when, it is in parallel with current sensing resistor that the first resistor of different resistance values can be made, so that power supply be made to become
There is different resistance values between the current controling end 201 and ground terminal of parallel operation 200.
In addition, the present embodiment can be without being limited thereto, the resistance value of the first resistor of each current sensing resistor string can also be set
It is set to other values, for example, the resistance value of certain several first resistor can be identical.
In the present embodiment, current selecting circuit 102 can also have at least one ON-OFF control circuit, in Fig. 1, show
4 ON-OFF control circuits 1025,1026,1027 and 1028 are gone out, the voltage at each ON-OFF control circuit both ends can control this and open
Close whether control circuit is connected.
In the present embodiment, each ON-OFF control circuit 1025,1026,1027 and 1028 all selects resistance 101 simultaneously with electric current
Connection, therefore, electric current select 101 both ends of resistance voltage it is identical as the voltage at each ON-OFF control circuit both ends, as a result, by adjusting
Electric current selects the resistance value of resistance 101, the voltage value at electric current selection 101 both ends of resistance can be adjusted, to control each switch control
Whether circuit is connected.
In the present embodiment, on state threshold voltage needed for each ON-OFF control circuit conducting can be different, as a result, in electric current
In the case that the voltage at selection 101 both ends of resistance is gradually increasing, the lower ON-OFF control circuit of on state threshold voltage can be with guide
Logical, the higher ON-OFF control circuit of on state threshold voltage can be connected later.
In the present embodiment, each ON-OFF control circuit 1025,1026,1027 and 1028, which can be controlled separately, is attached thereto
Whether first switching element Q1, Q2, Q3 and Q4 in current sensing resistor string 1021,1022,1023 and 1024 are connected, as a result,
Electric current selection resistance 101 is corresponding to control by controlling whether each ON-OFF control circuit 1025,1026,1027 and 1028 is connected
Current sensing resistor string 1021,1022,1023 and 1024 in first switching element Q1, Q2, Q3 and Q4 whether be connected.
In the present embodiment, each ON-OFF control circuit can have second switch element (Q5, Q6, Q7 and Q8), pressure stabilizing member
Part (D1, D2, D3 and D4) and second resistance (R6, R7, R8 and R9), wherein the electric current of second switch element flows into end and electric current
Outflow end, the second resistance and the voltage stabilizing element are connected in series between terminal X1 and ground terminal, also, the second resistance and
Tie point between the voltage stabilizing element is connected to the control terminal of first switching element, such as grid.
In the present embodiment, by taking ON-OFF control circuit 1025 as an example, the voltage at 1025 both ends of ON-OFF control circuit makes surely
In the case where pressing element D1 breakdown, second switch element Q5 conducting, so that the voltage at the both ends second resistance R5 increases, to make
First switching element Q1 conducting；1025 both ends of ON-OFF control circuit undertension so that voltage stabilizing element D1 breakdown situation
Under, second switch element Q5 shutdown, the voltage at the both ends second resistance R5 is identical as ground terminal, thus first switching element Q1 is closed
It is disconnected.
In the present embodiment, each second switch element Q5, Q6, Q7 and Q8 can be npn bipolar junction transistor, but this implementation
Example is without being limited thereto, and second switch element is also possible to other types of switch element.
In the present embodiment, on state threshold voltage needed for the conducting of each ON-OFF control circuit can be hit with each voltage stabilizing element
Voltage correlation is worn, the breakdown voltage of voltage stabilizing element is higher, and on state threshold voltage needed for ON-OFF control circuit conducting is higher.?
In one embodiment, the breakdown voltage of each voltage stabilizing element can be different.
In the present embodiment, voltage stabilizing element can be zener diode, for example, the breakdown voltage of voltage stabilizing element D1 can be
6.2V, model can be BZX79-6V2；The breakdown voltage of voltage stabilizing element D2 can be 5.1V, and model can be BZX79-
5V1；The breakdown voltage of voltage stabilizing element D3 can be 3.9V, and model can be BZX79-3V9；The breakdown voltage of voltage stabilizing element D4
It can be 2.4V, model can be BZX79-2V4.In addition, each voltage stabilizing element is also possible to other types and model.
In addition, as shown in Figure 1, each ON-OFF control circuit 1025,1026,1027 and 1028 can also have 3rd resistor
R10, R11, R12 and R13, each 3rd resistor can connect between the base stage (base) and terminal X1 of each second switch element.
In the present embodiment, it under a certain specific voltage, can be all connected with more than two ON-OFF control circuits, example
Such as, the case where voltage at electric current selection 101 both ends of resistance is higher than the on state threshold voltage of ON-OFF control circuit 1027 and 1028
Under, the conducting of ON-OFF control circuit 1027 and 1028 can be made all to be connected, make first resistor R4 and R5 access power supply all in parallel as a result,
Between the current controling end 201 and ground terminal of converter 200.
The present embodiment can be without being limited thereto, for example, can make others in the case where an ON-OFF control circuit is connected
The case where ON-OFF control circuit disconnects, and more than two ON-OFF control circuits is avoided to simultaneously turn on as a result,.
As shown in Figure 1, current selecting circuit 102 can also have at least one additional control unit, in fig. 1 it is illustrated that
3 additional control units 1031,1032 and 1033.
In the present embodiment, additional control unit can be controlled, so that the of a current sensing resistor string
In the case where one switching elements conductive, the first switching element of other current sensing resistor strings is turned off, for example, additional control unit
So that in the case where the ON-OFF control circuit conducting with higher on state threshold voltage, opening with lower on state threshold voltage
Close control circuit shutdown.
In the present embodiment, each additional control unit can be respectively and except the switch control with highest on state threshold voltage
Other ON-OFF control circuits connection except circuit, for example, in Fig. 1, the highest ON-OFF control circuit of on state threshold voltage is
1025, other ON-OFF control circuits are 1026,1027 and 1028, and therefore, additional control unit 1031,1032 and 1033 is distinguished
It is connect with other ON-OFF control circuit 1026,1027 and 1028.If being not provided with 1031,1032 He of additional control unit
1033, then in the case where the highest ON-OFF control circuit 1025 of on state threshold voltage is connected, other ON-OFF control circuits
That 1026,1027 and 1028 can also be connected, thus, the application by by additional control unit 1031,1032 and 1033 respectively with
The lower ON-OFF control circuit 1026,1027 and 1028 of conduction threshold connects, and can be avoided more than two ON-OFF control circuits
It simultaneously turns on.
In the present embodiment, as shown in Figure 1, each additional control unit can have third switch element Q9, Q10 and Q11,
The third switch element can be npn bipolar junction transistor or other kinds of switch element.
In the present embodiment, the collector of each third switch element (Q9, Q10 and Q11) can be with corresponding second switch
The base stage of element (Q6, Q7 and Q8) connects, and the base stage of each third switch element (Q9, Q10 and Q11) can be via 3rd resistor
(R20, R21 and R22) is connected to the ON-OFF control circuit than third switch element control with higher on state threshold voltage
ON-OFF control circuit corresponding to first switching element grid.
For example, as shown in Figure 1, third switch element Q9 control ON-OFF control circuit be 1026, compare ON-OFF control circuit
1026 ON-OFF control circuits with higher on state threshold voltage are 1025, so, the base stage of Q9 is via 3rd resistor R20 connection
To the grid of first switching element Q1 corresponding to ON-OFF control circuit 1025, as a result, in the case where Q1 is connected, Q9 is also led
Logical, the decline of Q6 base potential causes Q6 to disconnect, so that Q2 is disconnected；Equally, the ON-OFF control circuit of third switch element Q10 control
It is 1027, having the ON-OFF control circuit of higher on state threshold voltage than ON-OFF control circuit 1027 is 1025 and 1026, so,
The base stage of Q10 is connected to the grid of first switch Q1 corresponding to ON-OFF control circuit 1025 via 3rd resistor R20, Q10's
Base stage is also connected to the grid of first switch Q2 corresponding to ON-OFF control circuit 1026 via 3rd resistor R21, as a result, in Q1
Or in the case that Q2 is connected, Q10 conducting causes Q3 to disconnect so that Q7 is disconnected；Equally, the switch of third switch element Q11 control
Control circuit is 1028, to have the ON-OFF control circuit of higher on state threshold voltage than ON-OFF control circuit 1028 be 1025,
1026 and 1027, so, the base stage of Q11 is connected to corresponding to ON-OFF control circuit 1,025 first via 3rd resistor R20 and opens
The grid of Q1 is closed, the base stage of Q11 is also connected to first switch Q2 corresponding to ON-OFF control circuit 1026 via 3rd resistor R21
Grid, the base stage of Q11 is also connected to the grid of first switch Q3 corresponding to ON-OFF control circuit 1027 via 3rd resistor R22
Pole, as a result, in the case where Q1, Q2 or Q3 are connected, Q11 conducting causes Q4 to disconnect so that Q8 is disconnected.
In the present embodiment, it is connect in the base stage of third switch element with the grid of more than two first switching elements
In the case of, it is also provided with diode on the connection path that connect with the grid of each first switching element, to avoid different companies
The signal connect on path interferes with each other.For example, the link road of the grid of the grid and Q2 of the base stage and Q1 of third switch element Q10
Diode D6 and D7, the base stage of third switch element Q11 and grid, the grid of Q2 and the grid of Q3 of Q1 are respectively arranged on diameter
Connection path on be respectively arranged with diode D9, D10 and D11.
In the present embodiment, by setting additional control unit (1031,1032 and 1033), can be to avoid more than two
The case where ON-OFF control circuit simultaneously turns on, as a result, current selecting circuit 102 is primary only to select a first resistor connection
To supply convertor 200.
According to an embodiment of the present application, the electric current that the input terminal of current selecting circuit is connected to by change selects resistance
Resistance value, to adjust the resistance value for the resistance for being linked into supply convertor, the electric current exported so as to adjust the supply convertor
Current value, thus, it is possible to carry out flexible electric current selection；Also, the quantity of the output port of current selecting circuit will not increase
Add.
Embodiment 2
The embodiment of the present application 2 provides a kind of driving circuit, which can have electric current selection described in embodiment 1
Device 100 and supply convertor shown in FIG. 1 200.
As shown in Figure 1, supply convertor 200 can be according to the electric current of electric current selection device 100 in driving circuit 300
The selected resistance of selection circuit 102 exports electric current.
Fig. 2 is the supply convertor collocation current selecting circuit of the present embodiment to form a schematic diagram of driving circuit,
As shown in Fig. 2, driving circuit 300a has electric current selection device 100 and supply convertor 200a, wherein the electric current of Fig. 2 selects
The structure of device 100 is identical as Fig. 1, and the explanation about electric current selection device 100 can be with reference implementation example 1, the power conversion of Fig. 2
Device 200a is a specific circuit structure of the supply convertor 200 of Fig. 1.
In the following, the driving circuit 300a to Fig. 2 is illustrated.
As shown in Fig. 2, supply convertor 200a can have rectification circuit BD1 and smoothing capacity C2, wherein rectification circuit
BD1 for example can be diode bridge circuit, and the alternating voltage that can be inputted to AC power source AC rectifies；Smoothing capacity C2
Voltage after capable of rectifying to rectification circuit BD1 carries out smoothly to form DC power supply.
Supply convertor 200a can also have switch element Q21, centralized control unit U1 to export control signal from port 6
With the turn-on and turn-off of control switch element Q21.
Supply convertor 200a can also have transformer T1, transformer T1 to have first side winding P1, secondary side winding
S1 and auxiliary winding Aux, auxiliary winding Aux provide operating voltage to the port of centralized control unit U1 1, also, center controls
The port 1 of unit U1 is connect with the power end Vcc of electric current selection device 100.
Supply convertor 200a can also have rectifier diode D52 and smoothing capacity C28, C29, wherein two poles of rectification
Pipe D52 is connect with secondary winding S1 respectively, is rectified for the sensing voltage to secondary winding S1；Smoothing capacity C28, C29
For smoothly being exported to the voltage progress after rectification with forming driving current.
As shown in Fig. 2, being connected in series between the port 5 and ground terminal of the centralized control unit U1 of supply convertor 200a
Resistance R29, R211 and R212, the port x 3 and X4 of electric current selection device 100 are connected to the both ends resistance R211 and R212, pass through tune
The resistance value of electric current selection resistance between the port x 1 and X2 of whole electric current selection device 100, can adjust via port x 3 and X4
The resistance value of the resistance in parallel with resistance R211 and R212, so as to adjust the electric current of the driving current of the output of supply convertor 200a
Value.
In addition, as shown in Fig. 2, the supply convertor 200a of Fig. 2 can also have varistor RV1, fuse F1, inductance
L1, inductance L2, resistance R21, resistance R22, capacitor CX1, CY1, resistance R23, inductance L3, resistance R24, R25, R26, R28,
R210, R214, R215, capacitor C23, C24, C25, C26, C41, diode D32, D22, D42, about the explanation of said elements,
The prior art can be referred to, this embodiment is not repeated.
The explanation of the port 2 of centralized control unit U1 about Fig. 2, port 3 and port 4 can also refer to the prior art.
It should be noted that the supply convertor 200a of Fig. 2 is only an embodiment of supply convertor 200, this reality
It applies example to be not limited to this, supply convertor also can have other structures.
In the driving circuit of the present embodiment, the electric current selection electricity of the input terminal of current selecting circuit is connected to by changing
The resistance value of resistance is exported to adjust the resistance value for the resistance for being linked into supply convertor so as to adjust the supply convertor
The current value of electric current, thus, it is possible to carry out flexible electric current selection；Also, the quantity of the output port of current selecting circuit is not
It will increase.
Combine specific embodiment that the application is described above, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, and are not the limitation to the application protection scope.Those skilled in the art can be according to the application
Spirit and principle various variants and modifications are made to the application, these variants and modifications are also within the scope of application.
Claims (9)
1. a kind of current selecting circuit, which is characterized in that resistance of the current selecting circuit according to preset electric current selection resistance
The gear of value selection output electric current,
The current selecting circuit has input terminal and output end,
The input terminal is connect with electric current selection resistance,
The output end is connect with supply convertor,
The current selecting circuit selects the resistance value of resistance according to the electric current, makes corresponding with the output gear of electric current
Resistance with predetermined resistance is connect via the output end with the supply convertor,
The supply convertor exports electric current according to the selected resistance of the current selecting circuit.
2. current selecting circuit as described in claim 1, wherein
The supply convertor has current controling end, and the current controling end is connected with current sensing resistor,
The selected resistance of current selecting circuit is in parallel with the current sensing resistor.
3. current selecting circuit as described in claim 1, wherein
The current selecting circuit has at least one current sensing resistor string,
Each described current sensing resistor string is connect with the output end,
Each described current sensing resistor string has concatenated first switching element and first resistor,
Whether the first switching element that the electric current selection resistance controls in the current sensing resistor string is connected.
4. current selecting circuit as claimed in claim 3, wherein
The resistance value of the first resistor of each current sensing resistor string is different from each other.
5. current selecting circuit as claimed in claim 3, wherein
The current selecting circuit also has at least one ON-OFF control circuit,
Each described ON-OFF control circuit selects resistor coupled in parallel with the electric current,
The electric current selection resistance controls whether the ON-OFF control circuit is connected,
The first switching element for the current sensing resistor string that each described ON-OFF control circuit control is attached thereto
Whether be connected.
6. current selecting circuit as claimed in claim 5, wherein
The current selecting circuit also has divider resistance,
The electric current selection resistance and the divider resistance are connected in series in the power end and ground terminal of the current selecting circuit
Between.
7. current selecting circuit as claimed in claim 5, wherein
The current selecting circuit also has at least one additional control unit,
The additional control unit is for controlling, so that the case where the first switching element of a current sensing resistor string is connected
Under, the first switching element of other current sensing resistor strings turns off.
8. current selecting circuit as claimed in claim 7, wherein
The additional control unit to have in the case where the ON-OFF control circuit conducting with higher on state threshold voltage
The ON-OFF control circuit of lower on state threshold voltage turns off.
9. a kind of driving circuit, with any in supply convertor, preset electric current selection resistance and such as claim 1-8
Current selecting circuit described in, wherein the supply convertor is exported according to the selected resistance of the current selecting circuit
Electric current.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566052.9A CN109256939B (en) | 2017-07-12 | 2017-07-12 | Current selection circuit and drive circuit |
| PCT/CN2018/094839 WO2019011193A1 (en) | 2017-07-12 | 2018-07-06 | Current selection circuit and drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566052.9A CN109256939B (en) | 2017-07-12 | 2017-07-12 | Current selection circuit and drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109256939A true CN109256939A (en) | 2019-01-22 |
| CN109256939B CN109256939B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710566052.9A Active CN109256939B (en) | 2017-07-12 | 2017-07-12 | Current selection circuit and drive circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109256939B (en) |
| WO (1) | WO2019011193A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023093156A1 (en) * | 2021-11-26 | 2023-06-01 | 荣耀终端有限公司 | Power conversion circuit and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110285289A1 (en) * | 2010-05-20 | 2011-11-24 | Rv Lighting | Light Emitting Diode Bulb |
| CN104333933A (en) * | 2013-07-22 | 2015-02-04 | 全汉企业股份有限公司 | Light emitting diode driving device and light emitting diode illumination system applying same |
| CN105700606A (en) * | 2016-01-22 | 2016-06-22 | 深圳微步信息股份有限公司 | Power module and output voltage regulating method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103547009B (en) * | 2012-07-09 | 2016-09-14 | 登丰微电子股份有限公司 | linear current regulator |
| CN104238609A (en) * | 2013-06-14 | 2014-12-24 | 鸿富锦精密工业（深圳）有限公司 | Voltage regulation circuit |
-
2017
- 2017-07-12 CN CN201710566052.9A patent/CN109256939B/en active Active
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2018
- 2018-07-06 WO PCT/CN2018/094839 patent/WO2019011193A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110285289A1 (en) * | 2010-05-20 | 2011-11-24 | Rv Lighting | Light Emitting Diode Bulb |
| CN104333933A (en) * | 2013-07-22 | 2015-02-04 | 全汉企业股份有限公司 | Light emitting diode driving device and light emitting diode illumination system applying same |
| CN105700606A (en) * | 2016-01-22 | 2016-06-22 | 深圳微步信息股份有限公司 | Power module and output voltage regulating method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023093156A1 (en) * | 2021-11-26 | 2023-06-01 | 荣耀终端有限公司 | Power conversion circuit and electronic device |
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| Publication number | Publication date |
|---|---|
| WO2019011193A1 (en) | 2019-01-17 |
| CN109256939B (en) | 2020-09-01 |
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