CN207782659U - Promote the reduction voltage circuit of circuit reliability - Google Patents
Promote the reduction voltage circuit of circuit reliability Download PDFInfo
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- CN207782659U CN207782659U CN201721851896.XU CN201721851896U CN207782659U CN 207782659 U CN207782659 U CN 207782659U CN 201721851896 U CN201721851896 U CN 201721851896U CN 207782659 U CN207782659 U CN 207782659U
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Abstract
The utility model provides a kind of reduction voltage circuit promoting circuit reliability, it solves prior art chip more than the technical problems such as burning out after temperature.The reduction voltage circuit of this promotion circuit reliability, including three-terminal regulator chip, the input terminal of three-terminal regulator chip is connected with Input voltage terminal, the output end of three-terminal regulator chip is connected with output voltage terminal, the ground terminal of three-terminal regulator chip is connected with ground terminal, it is equipped with resistance between the input terminal and Input voltage terminal of three-terminal regulator chip, filter circuit is equipped between Input voltage terminal and ground terminal and/or between output voltage terminal and ground terminal；Filter circuit includes the first filter capacitor and the second filter capacitor parallel with one another.Advantage is：By the resistance that big resistance value is arranged between the input terminal and Input voltage terminal of three-terminal regulator chip, reasonably select the rated power and resistance value of resistance, and high frequency ripple is filtered out by filter circuit, the temperature in three-terminal regulator chip can be made to control in operating temperature ratings.
Description
Technical field
The utility model belongs to reduction voltage circuit technical field, more particularly, to a kind of decompression electricity promoting circuit reliability
Road.
Background technology
It, especially will be compared with currently, a large amount of electronic product needs power supply being converted to the direct current of suitable voltage to power
The direct current of high voltage is converted to the direct current of low voltage, so, market needs a large amount of reduction voltage circuit.Current decompression electricity
Road is mainly built by chips such as such as LDO, 78LXX, but often be will appear chip in existing reduction voltage circuit and be more than
The phenomenon that being burnt out after temperature.
Invention content
The purpose of this utility model is can to protect chip in view of the above-mentioned problems, provide a kind of reasonable design, simple in structure
The reduction voltage circuit for the promotion circuit reliability not being burned.
In order to achieve the above objectives, the utility model uses following technical proposal：The decompression electricity of this promotion circuit reliability
The input terminal on road, including three-terminal regulator chip, the three-terminal regulator chip is connected with Input voltage terminal, the three-terminal voltage-stabilizing
The output end of chip is connected with output voltage terminal, and the ground terminal of the three-terminal regulator chip is connected with ground terminal, in three-terminal voltage-stabilizing
Resistance is equipped between the input terminal and Input voltage terminal of chip, between Input voltage terminal and ground terminal and/or in output voltage
Filter circuit is equipped between end and ground terminal；The filter circuit includes that the first filter capacitor and second parallel with one another filters
Capacitance.
In the reduction voltage circuit of above-mentioned promotion circuit reliability, the three-terminal regulator chip is LDO chips.
In the reduction voltage circuit of above-mentioned promotion circuit reliability, first filter capacitor is polarized capacitance, institute
The second filter capacitor stated is polarity free capacitor.
In the reduction voltage circuit of above-mentioned promotion circuit reliability, the capacitance of first filter capacitor 1uF extremely
Between 20uF, the capacitance of second filter capacitor is in 0.01uF between 2uF.
In the reduction voltage circuit of above-mentioned promotion circuit reliability, first filter capacitor is electrolytic capacitor, described
The second filter capacitor be ceramic condenser.
Compared with prior art, the advantages of reduction voltage circuit of this promotion circuit reliability, is：By in three-terminal voltage-stabilizing
The resistance of big resistance value is set between the input terminal and Input voltage terminal of chip, reasonably selects the rated power and resistance value of resistance, and
High frequency ripple is filtered out by filter circuit, the temperature in three-terminal regulator chip can be made to control in operating temperature ratings, it can
It protects chip not to be burned, greatly improves the stability and applicability of reduction voltage circuit.
Description of the drawings
Fig. 1 provides the structural schematic diagram of the utility model.
In figure, three-terminal regulator chip 1, input terminal 11, output end 12, ground terminal 13, Input voltage terminal 2, output voltage terminal 3,
Ground terminal 4, resistance 5, the first filter capacitor 6, the second filter capacitor 7.
Specific implementation mode
The technical issues of in order to keep the utility model solved, technical solution and advantageous effect are more clearly understood, below
The utility model is described further with reference to the drawings and specific embodiments, but the utility model is not limited to described implementation
Example, on the contrary, the utility model includes whole modifications, modification and the equivalent fallen within the scope of the appended claims.
As shown in Figure 1, the reduction voltage circuit of this promotion circuit reliability, including three-terminal regulator chip 1, three-terminal regulator chip 1
Input terminal 11 be connected with Input voltage terminal 2, the output end 12 of three-terminal regulator chip 1 is connected with output voltage terminal 3, three-terminal voltage-stabilizing
The ground terminal 13 of chip 1 is connected with ground terminal 4, and resistance is equipped between the input terminal 11 and Input voltage terminal 2 of three-terminal regulator chip 1
5, filter circuit is equipped between Input voltage terminal 2 and ground terminal 4 and/or between output voltage terminal 3 and ground terminal 4；Three
It can be connected with first resistor between the output end 12 and output voltage terminal 3 of end voltage stabilizing chip 1, first resistor is not shown in the accompanying drawings
Go out, three-terminal regulator chip 1 is preferably LDO chips.
The rated power and resistance value of resistance 5 reasonably select as needed.The voltage of Input voltage terminal 2 is denoted as VDD1, output
The voltage of voltage end 3 is denoted as VDD2, and load current is denoted as I, and the power consumption of LDO chips is denoted as P, then P=(VDD1-VDD2) * I.It is false
If VDD1 is 5V, it is desirable that output voltage VDD2 is 1.5V, and output current 0.8A then selects LDO chips for AMS117-1.5V
The resistance value of (rated current 1A), resistance 5 are 3.9 Ω, then P=(5-3.9*0.8-1.5) * 0.8=0.304W, LDO chips Wen Sheng
About 30 DEG C, in addition 40 DEG C of environment temperature, 70 DEG C of maximum temperature, are much smaller than 125 DEG C of operating temperature ratings, the power consumption of resistance 5 is remembered
For Pr, then Pr=0.8*0.8*3.9=2.496W, is less than 5 rated power of resistance.
Specifically, filter circuit includes the first filter capacitor 6 and the second filter capacitor 7 parallel with one another, the first filtered electrical
Hold and be connected with second resistance between 6 and ground terminal 4, is connected with 3rd resistor between the second filter capacitor 7 and ground terminal 4, second
Resistance and 3rd resistor are not shown in the accompanying drawings；First filter capacitor 6 is polarized capacitance, and the second filter capacitor 7 is electrodeless
Property capacitance；The capacitance of first filter capacitor 6 in 1uF between 20uF, the capacitance of the second filter capacitor 7 0.01uF extremely
Between 2uF；First filter capacitor 6 is electrolytic capacitor, and the second filter capacitor 7 is ceramic condenser.Because of the parasitism electricity of electrolytic capacitor
Feel larger, elimination high frequency ripple ability is poor, and polarity free capacitor parasitic inductance is smaller, and it is preferable to filter out high frequency ripple ability；But
If selecting capacity according to the requirement of low frequency, polarity free capacitor volume is too big, and cost is also high, and electrolytic capacitor is small, equally
Capacity price is relatively inexpensive, therefore uses polarity free capacitor and electrolytic capacitor in parallel.
By the way that the resistance 5 of big resistance value is arranged between the input terminal 11 and Input voltage terminal 2 of three-terminal regulator chip 1, rationally
The rated power and resistance value of resistance 5 are selected, and high frequency ripple is filtered out by filter circuit, can be made in three-terminal regulator chip 1
Temperature control in operating temperature ratings, chip can be protected not to be burned, greatly improve reduction voltage circuit stability and
Applicability.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Although three-terminal regulator chip 1, input terminal 11, output end 12, ground terminal 13, Input voltage terminal is used more herein
2, the terms such as output voltage terminal 3, ground terminal 4, resistance 5, the first filter capacitor 6, second filter capacitor 7, but use is not precluded
The possibility of other terms.The use of these terms is merely for the convenience of describing and explaining the nature of the invention；
It is contrary to the spirit of the present invention that they, which are construed to any one of the additional limitations all,.
Claims (5)
1. a kind of reduction voltage circuit promoting circuit reliability, including three-terminal regulator chip (1), the three-terminal regulator chip (1)
Input terminal (11) be connected with Input voltage terminal (2), the output end (12) and output voltage terminal of the three-terminal regulator chip (1)
(3) it is connected, the ground terminal (13) of the three-terminal regulator chip (1) is connected with ground terminal (4), which is characterized in that in three-terminal voltage-stabilizing
Resistance (5) is equipped between the input terminal (11) and Input voltage terminal (2) of chip (1), in Input voltage terminal (2) and ground terminal (4)
Between and/or between output voltage terminal (3) and ground terminal (4) be equipped with filter circuit；The filter circuit includes mutually simultaneously
The first filter capacitor (6) and the second filter capacitor (7) of connection.
2. the reduction voltage circuit according to claim 1 for promoting circuit reliability, which is characterized in that the three-terminal voltage-stabilizing core
Piece (1) is LDO chips.
3. the reduction voltage circuit according to claim 1 for promoting circuit reliability, which is characterized in that first filtered electrical
It is polarized capacitance to hold (6), and second filter capacitor (7) is polarity free capacitor.
4. the reduction voltage circuit according to claim 3 for promoting circuit reliability, which is characterized in that first filtered electrical
Hold the capacitance of (6) in 1uF between 20uF, the capacitance of second filter capacitor (7) is in 0.01uF between 2uF.
5. the reduction voltage circuit according to claim 4 for promoting circuit reliability, which is characterized in that first filtered electrical
It is electrolytic capacitor to hold (6), and second filter capacitor (7) is ceramic condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721851896.XU CN207782659U (en) | 2017-12-26 | 2017-12-26 | Promote the reduction voltage circuit of circuit reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721851896.XU CN207782659U (en) | 2017-12-26 | 2017-12-26 | Promote the reduction voltage circuit of circuit reliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207782659U true CN207782659U (en) | 2018-08-28 |
Family
ID=63224541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721851896.XU Expired - Fee Related CN207782659U (en) | 2017-12-26 | 2017-12-26 | Promote the reduction voltage circuit of circuit reliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207782659U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
-
2017
- 2017-12-26 CN CN201721851896.XU patent/CN207782659U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180828 Termination date: 20201226 |
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| CF01 | Termination of patent right due to non-payment of annual fee |