CN209344756U - A kind of switching power circuit - Google Patents
A kind of switching power circuit Download PDFInfo
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- CN209344756U CN209344756U CN201822159060.4U CN201822159060U CN209344756U CN 209344756 U CN209344756 U CN 209344756U CN 201822159060 U CN201822159060 U CN 201822159060U CN 209344756 U CN209344756 U CN 209344756U
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Abstract
The utility model relates to field of power supplies, and in particular to a kind of switching power circuit, including fuse, DC power supply circuit, input protection circuit, charging control circuit, battery, switching on and shutting down control circuit, voltage input selection switch, output protection circuit；Fuse connects the DC power supply circuit, and DC power supply circuit connects charging control circuit, and charging control circuit connects the battery, and charging control circuit is also respectively connected with switching on and shutting down control circuit and voltage input selection switch；Output protection circuit is connect with switching on and shutting down control circuit.Input protection circuit is connect with fuse and DC power supply respectively, for controlling blown fuse, protecting the work safety of DC power supply circuit when detecting that input voltage is excessive.Switch selection battery power supply is selected by voltage input or is powered by external power supply, guarantees that switching power circuit being capable of continued power.By the way that voltage-stablizer is added in switching power circuit, it can guarantee the normal operation of switching power circuit.
Description
Technical field
The utility model relates to field of power supplies, in particular to a kind of switching power circuit.
Background technique
Power reflection meter is commonly used to measure the power of radio frequency (RF) or microwave frequency (MW) signal.Typical power reflection
Meter uses power detector or energy converter, so that RF or MW power is converted to easily measured electric parameter.Power reflection meter
Also there is application in RF the and MW system of many types.And radio-frequency power reflectometer usually requires specifically to power when in use
Power supply is powered for it, and existing power supply is not well positioned to meet power demands, thus be badly in need of developing it is a kind of can be defeated
Specific voltage, chargeable, safe and reliable Switching Power Supply out.
Utility model content
The purpose of utility model of the utility model is to overcome the above-mentioned deficiency in the presence of the prior art, provides one kind and open
Powered-down source circuit.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
A kind of switching power circuit, comprising: fuse, DC power supply circuit, input protection circuit, charging control circuit,
Battery, switching on and shutting down control circuit, voltage input selection switch, output protection circuit；The fuse connects the DC power supply
Circuit, the DC power supply circuit connect the charging control circuit, and the charging control circuit connects the battery, described to fill
Electric control circuit is also respectively connected with the switching on and shutting down control circuit and voltage input selection switch；The output protection circuit
It is connect with the switching on and shutting down control circuit.
The input protection circuit is connect with the fuse and the DC power supply circuit respectively, for defeated when detecting
Enter voltage it is excessive when, control the blown fuse, protect the work safety of the DC power supply circuit.
The charging control circuit is used to control the charging modes of the battery.
The switching on and shutting down control circuit is used to control the booting or shutdown of the switching power circuit.
The voltage input selection switch is powered by the battery or is powered by external power supply for selecting.
Preferably, the DC power supply circuit includes Switching Power Supply control chip N3, first resistor R16, the first field-effect
Pipe V5, the first inductance L2, second resistance R17,3rd resistor R18, the first freewheeling diode V6 and the second freewheeling diode V7.
Preferably, the Switching Power Supply controls chip N3 model LTC1624；The Switching Power Supply control chip N3's
VIN foot is connect with the drain electrode of one end of the first resistor R16 and the first field-effect tube V5 respectively；The Switching Power Supply control
The SEN- foot of coremaking piece N3 is connect with the other end of the first resistor R16；The TG foot of Switching Power Supply control chip N3 with
The grid of the first field-effect tube V5 connects；The first freewheeling diode V6 and the second freewheeling diode V7 parallel connection connect
It connects；The SW foot of the Switching Power Supply control chip N3 is connect with the cathode of the first freewheeling diode V6.
Preferably, when the first field-effect tube V5 is connected, energy is stored in the first inductance L2, described the
When one field-effect tube V5 ends, the energy of the first inductance L2 passes through the first freewheeling diode V6 and second afterflow
Diode V7 is provided to load；The first resistor R16 is used to detect the size of the electric current of output, as the first resistor R16
When the voltage at both ends exceeds threshold value, the DC power supply circuit stops output；The second resistance R17 and 3rd resistor R18 is used
In the size for adjusting the DC power supply circuit output voltage.
Preferably, the charging control circuit includes charge controlling chip N4, the first amplifier N5, the first light emitting diode
V21, the second light emitting diode V22, third light emitting diode V18, the 4th resistance R27, the 5th resistance R26, the 7th resistance R21,
8th resistance R22, the 9th resistance R23, the tenth resistance R36, first capacitor C30.
Preferably, the model BQ2954 of the charge controlling chip N4.
The SNS foot of the charge controlling chip N4 is connect with the output end of the first amplifier N5, with the 4th electricity
Hinder one end connection of R27；The reverse input end of the first amplifier N5 connects with the other end of the 4th resistance R27 respectively
It connects, connect with one end of the 5th resistance R26.
The first light emitting diode V21 and the second light emitting diode V22 are connected in parallel；The charge controlling chip
The LCM foot of N4 is connect with one end of the first light emitting diode V21, the LD1 foot of the charge controlling chip N4 and described the
The other end of one light emitting diode V21 connects；One end of the third light emitting diode V18 is with the charge controlling chip N4's
The connection of CHG foot, other end ground connection.
The VCC foot of the charge controlling chip N4 is connect with one end of the tenth resistance R36, the charge controlling chip
The TM foot of N4 is connect with the other end of the tenth resistance R36；The one end first capacitor C30 ground connection, one end and the charging
Control the TM foot connection of chip N4.
Preferably, the BAT foot of the charge controlling chip N4 is used to detect the voltage of rechargeable battery；Adjust the 4th electricity
The resistance value size of R27 and the 5th resistance R26 is hindered to change the amplification factor of the first amplifier N5, thus to constant current
Setting is adjusted in charging current；Adjust the 7th resistance R21, the 8th resistance R22, the 9th resistance R23
Size the size of constant-voltage charge voltage is configured；By adjusting the tenth resistance R36's and first capacitor C30
Size is configured the maximum charge time.
Preferably, the input protection circuit, including first comparator N6, the first triode V27, the second triode V26,
Second field-effect tube V30, third field-effect tube V33, the 4th field-effect tube V28, the 5th field-effect tube V29, the 6th field-effect tube
V31；The model LM2903D of the first comparator N6.
Preferably, the input protection circuit includes fuse F1, single-phase silicon-controlled V2 and the second comparator N2.
Preferably, the battery is lithium ion battery；It further include voltage-stablizer, the voltage-stablizer connects the charge control electricity
Road and the input protection circuit, for providing stable voltage.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:
1, input protection circuit is connect with fuse and DC power supply respectively in the utility model, detects input for working as
When voltage is excessive, blown fuse is controlled, the work safety of DC power supply circuit is protected.
2, switch selection battery power supply is selected by voltage input or is powered by external power supply, guarantee switching power circuit energy
Enough continued powers.
3, by the way that voltage-stablizer is added in switching power circuit, it can guarantee the normal operation of switching power circuit.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of switching power circuit.
Fig. 2 is the connection structure diagram of input protection circuit and the DC/DC power circuit of 10V/6A.
Fig. 3 is the structural schematic diagram of charging control circuit.
Fig. 4 is charging process curve graph.
Fig. 5 is input protection circuit figure
Fig. 6 is a kind of structural schematic diagram comprising voltage-stablizer of switching power circuit.
Wherein, 1- input protection circuit schematic diagram；The DC/DC power circuit of 2-10V/6A.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in detail.
Embodiment 1
A kind of switching power circuit, as shown in Figure 1, fuse, DC power supply circuit, input protection circuit, charge control
Circuit, battery, switching on and shutting down control circuit, voltage input selection switch, output protection circuit；Fuse is connected to DC power supply electricity
Road, DC power supply circuit connect charging control circuit, and charging control circuit connects battery, and charging control circuit is also respectively connected with out
Shutdown control circuit and voltage input selection switch；Output protection circuit is connect with switching on and shutting down control circuit.Input protection circuit
It is connect respectively with fuse and DC power supply circuit, for when detecting that input voltage is excessive, controlling blown fuse, protection
The work safety charging control circuit of DC power supply circuit is used to control the charging modes of battery.Switching on and shutting down control circuit is for controlling
The booting or shutdown of switching power circuit processed.Voltage input selection switch is battery powered or is supplied by external power supply for selecting
Electricity.
Input protection circuit 1 in Fig. 2, fuse F1, single-phase silicon-controlled V2 and the second comparator N2, the partial circuit are used for
The output voltage size of the size of external power supply supply input voltage and the DC/DC power supply of 10V/6A is detected, according to testing result
Battery is protected.Protection process are as follows: when external power supply is powered, and direct current input is greater than 35V or the DC/DC of 10V/6A is electric
When the output voltage in source is greater than 14V, one-way SCR V2 conducting increases input current, until fuse F1 is blown, to reach
To the purpose of the outer input protection battery of cutting, when external dc input voltage is too small, in charging and complete machine work, external input
Electric current may be more than 5A and by blowout, to avoid the problem, when external DC input voitage is less than 9V, 10V/
The DC/DC power supply of 4A will stop working, and the DC/DC converter being followed by will also stop working without input voltage, to make fuse
It will not be blown when input voltage is low.
DC/DC power circuit 2 in Fig. 2, including Switching Power Supply control chip N3, first resistor R16, the first field-effect tube
V5, the first inductance L2, second resistance R17,3rd resistor R18, the first freewheeling diode V6 and the second freewheeling diode V7.
It is LTC1624 that Switching Power Supply, which controls chip model,；Its switching frequency is 200kHz.Switching Power Supply controls chip
VIN foot is connect with the drain electrode of one end of first resistor R16 and the first field-effect tube V5 respectively；The SEN- of Switching Power Supply control chip
Foot is connect with the other end of first resistor R16；The TG foot of Switching Power Supply control chip is connect with the grid of the first field-effect tube V5；
First freewheeling diode V6 and the second freewheeling diode V7 are connected in parallel；Switching Power Supply controls SW foot and the first afterflow two of chip
The cathode of pole pipe V6 connects.
When the first field-effect tube V5 conducting, energy is stored in the first inductance L2, in the first field-effect tube V5 cut-off,
The energy of first inductance L2 is provided by the first freewheeling diode V6 and the second freewheeling diode V7 to load；First resistor R16
For detecting the size of the electric current of output, when the voltage at the both ends first resistor R16 exceeds threshold value, DC power supply circuit stops
Output；Second resistance R17 and 3rd resistor R18 is used to adjust the size of DC power supply circuit output voltage.
The size of output voltage is determined by second resistance R17 and 3rd resistor R18, stablizes 3 feet of LTC1624 when exporting
Voltage is 1.28V.The first resistor R16 in major loop that goes here and there is used to detect the size of output electric current, when the both ends first resistor R16
Voltage when being more than 0.1V, which will stop exporting.In addition when 2 feet of LTC1624 are low level, the DC/
DC power supply circuit will also stop exporting, i.e., when external input voltage is less than 9V, 14 feet of the second comparator N2 export low level
Stop output to control the DC/DC power circuit.
Fig. 3 is charging control circuit, including charge controlling chip N4, the first amplifier N5, the first light emitting diode V21,
Second light emitting diode V22, third light emitting diode V18, the 4th resistance R27, the 5th resistance R26, the 7th resistance R21, the 8th
Resistance R22, the 9th resistance R23, the tenth resistance R36, first capacitor C30.
The model BQ2954 of charge controlling chip N4；The output of the SNS foot of charge controlling chip and the first amplifier N5
End connection, connect with one end of the 4th resistance R27；The reverse input end of first amplifier N5 is another with the 4th resistance R27 respectively
One end connection is connect with one end of the 5th resistance R26.
First light emitting diode V21 and the second light emitting diode V22 are connected in parallel；The LCM foot of charge controlling chip and
One end of one light emitting diode V21 connects, and the LD1 foot of charge controlling chip is connect with the other end of the first light emitting diode V21；
One end of third light emitting diode V18 and the CHG foot of charge controlling chip connect, other end ground connection.
The VCC foot of charge controlling chip is connect with one end of the tenth resistance R36, the TM foot of charge controlling chip and the tenth
The other end of electric R36 connects；The TM foot of the one end first capacitor C30 ground connection, one end and charge controlling chip connects.
Its charging modes are as follows: constant pressure after first constant current.End-of-charge condition are as follows: (1) charging current is less than constant-current charge electric current
5%；(2) battery temperature is excessively high；(3) reach maximum time.By 3 feet of battery charge controlling chip BQ2954 to charging electricity
Cell voltage is detected, and when 3 foot no-voltage, the 10 feet output high level of battery charge controlling chip BQ2954 makes field-effect
Pipe V9 cut-off, while 2 feet of battery charge controlling chip BQ2954 export low level, third light emitting diode V18 is bright, instruction
No battery access.
When 3 feet of battery charge controlling chip BQ2954 have voltage, 10 feet of battery charge controlling chip BQ2954 are defeated
Field-effect tube V9 is connected in low level out, and charges the battery, and 15 feet of battery charge controlling chip BQ2954 export high
Level, 11 and 16 feet of battery charge controlling chip BQ2954 export low level, the first light emitting diode V21, and instruction is being filled
Electricity.
When the 3 foot voltages of battery charge controlling chip BQ2954 are less than 2.05V, constant-current charge is carried out to battery；Work as electricity
When the 3 foot voltages of pond charge controlling chip BQ2954 are upgraded to 2.05V, start to carry out constant-voltage charge to battery, until detecting knot
Charging terminates after beam condition, and 16 feet of battery charge controlling chip BQ2954 export high level, battery charge controlling chip
11 and 15 feet of BQ2954 export low level, and the second light emitting diode V22 is bright, and instruction battery has been filled with.
The BAT foot of charge controlling chip is used to detect the voltage of rechargeable battery；Adjust the 4th resistance R27 and the 5th resistance
The resistance value size of R26 is to change the amplification factor of the first amplifier N5, so that setting be adjusted to constant-current charge size of current；
Adjust the 7th resistance R21, the 8th resistance R22, the 9th resistance R23 size the size of constant-voltage charge voltage is configured；It is logical
The size for overregulating the tenth resistance R36 and first capacitor C30 is configured the maximum charge time.The size for changing C31 can be with
To the frequency for changing charge power supply.The size for adjusting divider resistance R19, R20 can be arranged temperature protection.
Fig. 4 is charging process curve graph, works as IfullWhen being selected as Imax/5 and being used for, resistance R81 does not have to；Work as IfullIt is selected as
When Imax/10, resistance R80 does not have to.
Fig. 5 is input protection circuit figure, including first comparator N6, the first triode V27, the second triode V26, second
Field-effect tube V30, third field-effect tube V33, the 4th field-effect tube V28, the 5th field-effect tube V29, the 6th field-effect tube V31.
It is powered when there is battery with battery for it, the 10V power supply that external power supply is converted by when no battery passes through field-effect
Diode inside pipe V9 is powered for it.The model LM2903D of first comparator N6,6 feet of first comparator N6 when powering on
Low level is exported, the 2 foot PB of first comparator N6 are switching on and shutting down push button signalling.
When 6 feet of first comparator N6 export low level, the first triode V27, the second triode V26, second effect
Should pipe V30, third field-effect tube V33, the 4th field-effect tube V28, the 5th field-effect tube V29, the 6th field-effect tube V31 cut
Only, VIO no-voltage, the DC/DC converter non-transformer input being followed by, certainly also just without output voltage.
When 6 feet of first comparator N6 export high level, further according to whether there is or not external powers, to select input power, the present age
When the VIN1 of table external power supply is greater than 12V, field-effect tube V32 is connected in the 14 feet output high level of first comparator N6, is forced
Third field-effect tube V33 is ended, thus the 6th field-effect tube V31 of shutdown；The high level of 6 feet of first comparator N6 simultaneously
Make the first triode V27, the second triode V26, the second field-effect tube V30, the 4th field-effect tube V28, the 5th field-effect tube V29
Conducting, the 10V that external power is converted into is connected at VIO and powers to the DC/DC converter being followed by, so that output voltage makes to complete machine
With.
When VIN1 is less than 12V, the 14 feet output low level of first comparator N6 ends field-effect tube V32, leads to the
Two field-effect tube V30 cut-off, thus shutdown the 4th field-effect tube V28, the 5th field-effect tube V29；The 6 of first comparator N6 simultaneously
The high level of foot makes third field-effect tube V33, the 6th field-effect tube V31, and battery output is connected at VIO to the DC/DC being followed by
Converter power supply, so that output voltage is used to complete machine.
As shown in fig. 6, being powered off after pressing Power off low level, when output voltage 5.2V is lower than 2V, 3.4V
Lower than 1.When 3V or when cell voltage is lower than 9V, the 8 foot input low levels of first comparator N6 make its reset, first comparator
The 6 feet output low level cutting of N6 is followed by the input of power supply, to stop powering to complete machine.
Battery is lithium ion battery；It further include voltage-stablizer, voltage-stablizer connects charging control circuit and input protection circuit, uses
In the voltage that offer is stable, model LM7805.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (8)
1. a kind of switching power circuit characterized by comprising fuse, DC power supply circuit, input protection circuit, charging
Control circuit, battery, switching on and shutting down control circuit, voltage input selection switch, output protection circuit；Described in the fuse connection
DC power supply circuit, the DC power supply circuit connect the charging control circuit, and the charging control circuit connects the electricity
Pond, the charging control circuit are also respectively connected with the switching on and shutting down control circuit and voltage input selection switch；It is described defeated
Protection circuit is connect with the switching on and shutting down control circuit out；
The input protection circuit is connect with the fuse and the DC power supply circuit respectively, detects input electricity for working as
When pressing through big, the blown fuse is controlled, protects the work safety of the DC power supply circuit；
The charging control circuit is used to control the charging modes of the battery；
The switching on and shutting down control circuit is used to control the booting or shutdown of the switching power circuit；
The voltage input selection switch is powered by the battery or is powered by external power supply for selecting；
The DC power supply circuit includes Switching Power Supply control chip N3, first resistor R16, the first field-effect tube V5, the first electricity
Feel L2, second resistance R17,3rd resistor R18, the first freewheeling diode V6 and the second freewheeling diode V7；
The Switching Power Supply controls chip N3 model LTC1624；The VIN foot of Switching Power Supply control chip N3 respectively with institute
The one end for stating first resistor R16 is connected with the drain electrode of the first field-effect tube V5；The Switching Power Supply control chip N3's
SEN- foot is connect with the other end of the first resistor R16；The TG foot of Switching Power Supply control chip N3 with described first
The grid of effect pipe V5 connects；The first freewheeling diode V6 and the second freewheeling diode V7 are connected in parallel；It is described to open
The SW foot for closing power supply control chip N3 is connect with the cathode of the first freewheeling diode V6.
2. a kind of switching power circuit according to claim 1, which is characterized in that when the first field-effect tube V5 is connected
When, energy is stored in the first inductance L2, in the first field-effect tube V5 cut-off, the energy of the first inductance L2
It is provided by the first freewheeling diode V6 and the second freewheeling diode V7 to load；The first resistor R16 is used for
The size for detecting the electric current of output, when the voltage at the both ends the first resistor R16 exceeds threshold value, the DC power supply circuit stops
Only export；The second resistance R17 and 3rd resistor R18 is used to adjust the size of the DC power supply circuit output voltage.
3. a kind of switching power circuit according to claim 1, which is characterized in that the charging control circuit includes charging
Control chip N4, the first amplifier N5, the first light emitting diode V21, the second light emitting diode V22, third light emitting diode
V18, the 4th resistance R27, the 5th resistance R26, the 7th resistance R21, the 8th resistance R22, the 9th resistance R23, the tenth resistance R36,
First capacitor C30.
4. a kind of switching power circuit according to claim 3, which is characterized in that the model of the charge controlling chip N4
For BQ2954；
The SNS foot of the charge controlling chip N4 is connect with the output end of the first amplifier N5, with the 4th resistance R27
One end connection；The reverse input end of the first amplifier N5 is connect respectively with the other end of the 4th resistance R27 and institute
State one end connection of the 5th resistance R26；
The first light emitting diode V21 and the second light emitting diode V22 are connected in parallel；The charge controlling chip N4's
LCM foot is connect with one end of the first light emitting diode V21, the LD1 foot of the charge controlling chip N4 and first hair
The other end of optical diode V21 connects；One end of the third light emitting diode V18 and the CHG of the charge controlling chip N4
Foot connection, other end ground connection；
The VCC foot of the charge controlling chip N4 is connect with one end of the tenth resistance R36, the charge controlling chip N4's
TM foot is connect with the other end of the tenth resistance R36；The one end first capacitor C30 ground connection, one end and the charge control
The TM foot of chip N4 connects.
5. a kind of switching power circuit according to claim 4, which is characterized in that the BAT of the charge controlling chip N4
Foot is used to detect the voltage of rechargeable battery；The resistance value size of the 4th resistance R27 and the 5th resistance R26 are adjusted to change
The amplification factor of the first amplifier N5, so that setting be adjusted to constant-current charge size of current；Adjust the 7th electricity
Resistance R21, the 8th resistance R22, the 9th resistance R23 size the size of constant-voltage charge voltage is configured；Pass through
The size for adjusting the tenth resistance R36 and the first capacitor C30 is configured the maximum charge time.
6. a kind of switching power circuit according to claim 1, which is characterized in that the input protection circuit, including the
One comparator N6, the first triode V27, the second triode V26, the second field-effect tube V30, third field-effect tube V33, the 4th
Effect pipe V28, the 5th field-effect tube V29, the 6th field-effect tube V31；The model LM2903D of the first comparator N6.
7. a kind of switching power circuit according to claim 1, which is characterized in that the input protection circuit further includes protecting
Dangerous silk F1, single-phase silicon-controlled V2 and the second comparator N2.
8. a kind of switching power circuit according to claim 1, which is characterized in that the battery is lithium ion battery；Also
Including voltage-stablizer, the voltage-stablizer connects the charging control circuit and the input protection circuit, for providing stable electricity
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822159060.4U CN209344756U (en) | 2018-12-21 | 2018-12-21 | A kind of switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822159060.4U CN209344756U (en) | 2018-12-21 | 2018-12-21 | A kind of switching power circuit |
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| Publication Number | Publication Date |
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| CN209344756U true CN209344756U (en) | 2019-09-03 |
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ID=67758241
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| CN201822159060.4U Active CN209344756U (en) | 2018-12-21 | 2018-12-21 | A kind of switching power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638768A (en) * | 2018-12-21 | 2019-04-16 | 成都前锋电子仪器有限责任公司 | A kind of switching power circuit |
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2018
- 2018-12-21 CN CN201822159060.4U patent/CN209344756U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638768A (en) * | 2018-12-21 | 2019-04-16 | 成都前锋电子仪器有限责任公司 | A kind of switching power circuit |
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