CN207765945U - It is a kind of can input direct-current Width funtion power circuit - Google Patents
It is a kind of can input direct-current Width funtion power circuit Download PDFInfo
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- CN207765945U CN207765945U CN201721855027.4U CN201721855027U CN207765945U CN 207765945 U CN207765945 U CN 207765945U CN 201721855027 U CN201721855027 U CN 201721855027U CN 207765945 U CN207765945 U CN 207765945U
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Abstract
The utility model discloses it is a kind of can input direct-current Width funtion power circuit, it includes input terminal, DC DC buck converters, voltage comparator and metal-oxide-semiconductor, the voltage of input terminal access is transmitted to the input terminal of voltage comparator, the output end voltage of voltage comparator is transmitted to the grid of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected to input terminal, the input terminal of DC DC buck converters is connected to input terminal, the output end of DC DC buck converters is connected to the drain electrode of metal-oxide-semiconductor, and voltage comparator is used for：When the voltage of input terminal access reaches reference voltage, high level signal is exported to the grid of metal-oxide-semiconductor, the voltage of input terminal access exports after DC DC buck converters carry out decompression conversion；When the voltage of input terminal access is not up to reference voltage, low level signal is exported to the grid of metal-oxide-semiconductor, the voltage of input terminal access is exported via the drain electrode of metal-oxide-semiconductor.The utility model can improve the versatility of power circuit, compatibility, and reduce security risk.
Description
Technical field
The utility model is related to power circuit more particularly to it is a kind of can input direct-current Width funtion power circuit.
Background technology
In the prior art, in the power pack of electronic product, Width funtion refers to input voltage than broad voltage range,
For example input voltage is 5V-23V, and narrow voltage refers to fixed voltage or narrower voltage range, such as input voltage
For 5V-5.5V.In practical application, answer electronic equipment type different, the power being related to also differs, and has caused supply voltage
The output voltage majority of difference, common power circuit is 5V, 9V, 12V, 15V, 24V etc., for 5V electrical equipments, when it
When misconnection enters the power supply of 9V or more, electronic device, fuse etc. can be caused to burn out, or enter overcurrent protection state, Wu Fazheng
It is often used, it can be seen that, existing power supply can only provide single supply voltage, when low-voltage equipment accesses high-voltage power supply,
Security risk is not only will produce, but also compatibility is poor, it is not generally applicable.
Utility model content
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide one kind and working as electronic equipment
When accessing power supply, corresponding supply voltage can be loaded on to electronic equipment, and then improve versatility, the compatibility of power circuit
Property, and reduce security risk can input direct-current Width funtion power circuit.
In order to solve the above technical problems, the utility model adopts the following technical solution.
It is a kind of can input direct-current Width funtion power circuit comprising have input terminal, DC-DC buck converters, voltage
Comparator and metal-oxide-semiconductor, the metal-oxide-semiconductor are P-channel metal-oxide-semiconductor, and the voltage of the input terminal access is transmitted to voltage comparator
The output end voltage of input terminal, the voltage comparator is transmitted to the grid of metal-oxide-semiconductor, and the source electrode of the metal-oxide-semiconductor is connected to input
The input terminal of terminal, the DC-DC buck converters is connected to input terminal, and the output end of the DC-DC buck converters connects
It is connected to the drain electrode of metal-oxide-semiconductor, the reference electricity of the voltage that the voltage comparator is used to access input terminal and the voltage comparator
Pressure is made comparisons：When the voltage of input terminal access reaches reference voltage, grid of the voltage comparator to the MOS pipes
Export high level signal, to enable the metal-oxide-semiconductor turn off, the voltage of the input terminal access by DC-DC buck converters into
It is exported after row decompression conversion；When the voltage of input terminal access is not up to reference voltage, the voltage comparator is to the MOS
The grid of pipe exports low level signal, to enable the MOS pipes be connected, the voltage of the input terminal access via metal-oxide-semiconductor leakage
Pole exports.
Preferably, the model IA9888 of the DC-DC buck converters, and the output of the DC-DC buck converters
Voltage is 5V.
Preferably, the model IA9808N-27S23F of the voltage comparator, and the reference electricity of the voltage comparator
Pressure is 5.5V.
Preferably, first resistor, the output end of the voltage comparator are connected between the source electrode and grid of the metal-oxide-semiconductor
It is connected to the grid of metal-oxide-semiconductor by second resistance, the resistance value of the first resistor is 10k Ω, the resistance value of the second resistance
For 1k Ω.
Preferably, the first resistor is parallel with the first capacitance.
Preferably, the input terminal passes through the 3rd resistor being sequentially connected in series and the 4th resistance eutral grounding, the 3rd resistor
It is connected with the input terminal of the voltage comparator with the tie point of the 4th resistance.
Preferably, the resistance value of the 3rd resistor is identical with the resistance value of the 4th resistance.
Preferably, the resistance value of the 3rd resistor and the resistance value of the 4th resistance are 180k Ω.
Preferably, the 4th resistor coupled in parallel has the second capacitance.
Preferably, ESD diode, the model of the ESD diode are connected between the input terminal and ground
ESD9N5BM。
It is disclosed by the utility model to be provided with two in the rear end of input terminal in the power circuit of input direct-current Width funtion
Transmission branch is the transmission branch based on DC-DC buck converters and the transmission branch based on metal-oxide-semiconductor respectively, and utilizes electricity
The voltage that pressure comparator accesses input terminal is detected, when the voltage of input terminal access reaches preset voltage value,
Illustrate that input voltage is higher, control metal-oxide-semiconductor shutdown at this time, higher voltage carries out decompression conversion by DC-DC buck converters
It is power electronic equipment afterwards, when the voltage of input terminal access is not up to preset voltage value, illustrates that input voltage can be direct
It uses, controls the conducting of MOS pipes at this time, the voltage of input terminal access is directly power electronic equipment.Based on above-mentioned characteristic, originally
Utility model is realized to be switched over according to the difference of input voltage, when the power supply of electronic equipment access is wider voltage range
When, corresponding supply voltage can be loaded on to electronic equipment, and then improve versatility, the compatibility of power circuit, significantly
Reduce security risk.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model power circuit.
Specific implementation mode
The utility model is described in more detail with reference to the accompanying drawings and examples.
The utility model discloses it is a kind of can input direct-current Width funtion power circuit, please refer to Fig. 1 comprising have input
Terminal J1, DC-DC buck converter U1, voltage comparator U2 and metal-oxide-semiconductor Q1, the metal-oxide-semiconductor Q1 are P-channel metal-oxide-semiconductor, described
The voltage of input terminal J1 accesses is transmitted to the input terminal of voltage comparator U2, the output end voltage of the voltage comparator U2
It is transmitted to the grid of metal-oxide-semiconductor Q1, the source electrode of the metal-oxide-semiconductor Q1 is connected to input terminal J1, the DC-DC buck converters U1's
The output end that input terminal is connected to input terminal J1, the DC-DC buck converters U1 is connected to the drain electrode of metal-oxide-semiconductor Q1, described
Voltage comparator U2 is for making comparisons the voltage that input terminal J1 is accessed with the reference voltage of voltage comparator U2：
When the voltage of input terminal J1 accesses reaches reference voltage, the voltage comparator U2 is to the MOS pipes Q1's
Grid exports high level signal, and to enable the metal-oxide-semiconductor Q1 turn off, the voltage of the input terminal J1 accesses is depressured by DC-DC
Converter U1 is exported after carrying out decompression conversion；
When the voltage of input terminal J1 access is not up to reference voltage, the voltage comparator U2 is to the metal-oxide-semiconductor Q1
Grid export low level signal, to enable the metal-oxide-semiconductor Q1 be connected, the voltage of the input terminal J1 accesses is via metal-oxide-semiconductor Q1
Drain electrode output.
In above-mentioned power circuit, two transmission branches are provided in the rear end of input terminal J1, are to be based on DC-DC respectively
The transmission branch of buck converter U1 and transmission branch based on metal-oxide-semiconductor Q1, and using voltage comparator U2 to input terminal J1
The voltage of access is detected, and when the voltage of input terminal J1 accesses reaches preset voltage value, illustrates that input voltage is higher,
Control metal-oxide-semiconductor Q1 shutdowns at this time, higher voltage by DC-DC buck converters U1 supply into electronic equipment after decompression is converted
Electricity illustrates that input voltage can be used directly, controls at this time when the voltage of input terminal J1 accesses is not up to preset voltage value
The voltage of metal-oxide-semiconductor Q1 conductings, input terminal J1 accesses is directly power electronic equipment.Based on above-mentioned characteristic, the utility model is real
Show and switched over according to the difference of input voltage, when the power supply of electronic equipment access is wider voltage range, can have been incited somebody to action
Corresponding supply voltage loads on electronic equipment, and then improves versatility, the compatibility of power circuit, greatly reduces safety
Hidden danger.
The model IA9888 of the DC-DC buck converters U1 as a preferred method, and the DC-DC is depressured
The output voltage of converter U1 is 5V.
Further, the model IA9808N-27S23F of the voltage comparator U2, and the voltage comparator U2
Reference voltage is 5.5V.
In order to ensure that metal-oxide-semiconductor Q1 accurately and reliably switches, the present embodiment is additionally arranged resistance in the grid of metal-oxide-semiconductor Q1, specifically
Refer to that first resistor R4 is connected between the source electrode and grid of the metal-oxide-semiconductor Q1, the output end of the voltage comparator U2 passes through
The resistance value of second resistance R5 and the grid for being connected to metal-oxide-semiconductor Q1, the first resistor R4 is 10k Ω, the second resistance R5's
Resistance value is 1k Ω.Further, the first resistor R4 is parallel with the first capacitance C5.
The present embodiment preferably uses the P-channel metal-oxide-semiconductor Q1 of low level conducting, and voltage comparator U2 is caused to utilize low level
Trigger metal-oxide-semiconductor Q1, for the metal-oxide-semiconductor using high level triggering, the present embodiment is effectively prevented because voltage floats, crosstalk
Caused malfunction, and then improve the stability of circuit.
In the present embodiment, in order to avoid the input side of high voltage damage voltage comparator U2, the input terminal J1 connects
The voltage entered is transmitted to voltage comparator U2 after voltage division processing, and specific way is that the input terminal J1 by going here and there successively
The 3rd resistor R6 of connection and the 4th resistance R7 ground connection, the tie point and the voltage ratio of the 3rd resistor R6 and the 4th resistance R7
Input terminal compared with device U2 is connected.
The present embodiment preferably by the input side voltage of voltage comparator U2 to half, in particular to, the third electricity
The resistance value for hindering R6 is identical with the resistance value of the 4th resistance R7.Further, the resistance value of the 3rd resistor R6 and the 4th resistance R7
Resistance value is 180k Ω.
The 4th resistance R7 is parallel with the second capacitance C6 as a preferred method,.
In order to realize electrostatic protection, overcurrent protection, in the present embodiment, ESD is connected between the input terminal J1 and ground
Diode CR1, the model ESD9N5BM of the ESD diode CR1.
The above is the utility model preferred embodiment, is not intended to limit the utility model, all in this practicality
Modification, equivalent replacement or the improvement etc. made in novel technical scope, should be included in the model that the utility model is protected
In enclosing.
Claims (10)
1. it is a kind of can input direct-current Width funtion power circuit, which is characterized in that include input terminal, DC-DC decompression conversion
Device, voltage comparator and metal-oxide-semiconductor, the metal-oxide-semiconductor are P-channel metal-oxide-semiconductor, and the voltage of the input terminal access is transmitted to voltage ratio
Compared with the input terminal of device, the output end voltage of the voltage comparator is transmitted to the grid of metal-oxide-semiconductor, the source electrode connection of the metal-oxide-semiconductor
In input terminal, the input terminals of the DC-DC buck converters is connected to input terminal, the DC-DC buck converters it is defeated
Outlet is connected to the drain electrode of metal-oxide-semiconductor, the voltage that the voltage comparator is used to access input terminal and the voltage comparator
Reference voltage is made comparisons：
When the voltage of input terminal access reaches reference voltage, the voltage comparator exports high to the grid of the metal-oxide-semiconductor
Level signal, to enable the metal-oxide-semiconductor turn off, the voltage of the input terminal access is depressured by DC-DC buck converters
It is exported after conversion；
When the voltage of input terminal access is not up to reference voltage, the voltage comparator is exported to the grid of the metal-oxide-semiconductor
Low level signal, to enable the metal-oxide-semiconductor be connected, the voltage of the input terminal access is exported via the drain electrode of metal-oxide-semiconductor.
2. as described in claim 1 can input direct-current Width funtion power circuit, which is characterized in that DC-DC decompression turns
The model IA9888 of parallel operation, and the output voltage of the DC-DC buck converters is 5V.
3. as described in claim 1 can input direct-current Width funtion power circuit, which is characterized in that the voltage comparator
Model IA9808N-27S23F, and the reference voltage of the voltage comparator is 5.5V.
4. as described in claim 1 can input direct-current Width funtion power circuit, which is characterized in that the source electrode of the metal-oxide-semiconductor
First resistor is connected between grid, the output end of the voltage comparator is connected to the grid of metal-oxide-semiconductor by second resistance
The resistance value of pole, the first resistor is 10k Ω, and the resistance value of the second resistance is 1k Ω.
5. as claimed in claim 4 can input direct-current Width funtion power circuit, which is characterized in that the first resistor is in parallel
There is the first capacitance.
6. as described in claim 1 can input direct-current Width funtion power circuit, which is characterized in that the input terminal passes through
The tie point of the 3rd resistor being sequentially connected in series and the 4th resistance eutral grounding, the 3rd resistor and the 4th resistance is compared with the voltage
The input terminal of device is connected.
7. as claimed in claim 6 can input direct-current Width funtion power circuit, which is characterized in that the resistance of the 3rd resistor
Value is identical with the resistance value of the 4th resistance.
8. as claimed in claim 7 can input direct-current Width funtion power circuit, which is characterized in that the resistance of the 3rd resistor
Value and the resistance value of the 4th resistance are 180k Ω.
9. as claimed in claim 6 can input direct-current Width funtion power circuit, which is characterized in that the 4th resistor coupled in parallel
There is the second capacitance.
10. as described in claim 1 can input direct-current Width funtion power circuit, which is characterized in that the input terminal with
ESD diode, the model ESD9N5BM of the ESD diode are connected between ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721855027.4U CN207765945U (en) | 2017-12-27 | 2017-12-27 | It is a kind of can input direct-current Width funtion power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721855027.4U CN207765945U (en) | 2017-12-27 | 2017-12-27 | It is a kind of can input direct-current Width funtion power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207765945U true CN207765945U (en) | 2018-08-24 |
Family
ID=63184755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721855027.4U Expired - Fee Related CN207765945U (en) | 2017-12-27 | 2017-12-27 | It is a kind of can input direct-current Width funtion power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207765945U (en) |
-
2017
- 2017-12-27 CN CN201721855027.4U patent/CN207765945U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180824 Termination date: 20201227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |