CN208539556U - A kind of overload protecting circuit - Google Patents
A kind of overload protecting circuit Download PDFInfo
- Publication number
- CN208539556U CN208539556U CN201821350005.7U CN201821350005U CN208539556U CN 208539556 U CN208539556 U CN 208539556U CN 201821350005 U CN201821350005 U CN 201821350005U CN 208539556 U CN208539556 U CN 208539556U
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- China
- Prior art keywords
- power switch
- switch chip
- connect
- resistance
- overload protecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a kind of overload protecting circuits, comprising: voltage regulator circuit, power switch chip and 3rd resistor.Voltage regulator circuit is connect with the input terminal of power switch chip, for providing stable input voltage to power switch chip；Moreover, voltage regulator circuit includes the second resistance for adjusting input voltage.3rd resistor one end is connect with the ground terminal of power switch chip, and the other end is connect with the current protection threshold value of power switch chip setting end, for adjusting the overcurrent protection threshold value of power switch chip.Therefore, the overload protecting circuit of the utility model can be improved the range of input voltage, and meet the requirement of high pressure fast charge power supply and equipment.
Description
Technical field
The utility model relates to load protection fields, and in particular to a kind of overload protecting circuit.
Background technique
Power protection switch special chip provides a kind of power management scheme of low power consumption high efficiency, reliable and stable guarantor
Protect USB power connector and equipment.And the input voltage range of existing USB power source protection special chip is relatively low, is unable to satisfy
The requirement of high pressure fast charge power supply and equipment.
Utility model content
The purpose of the utility model is to overcome the above-mentioned deficiencies in the presence of the prior art, provide a kind of overload protection electricity
Road.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
A kind of overload protecting circuit, comprising: voltage regulator circuit, power switch chip and 3rd resistor.
The voltage regulator circuit is connect with the input terminal of the power switch chip, for providing to the power switch chip
Stable input voltage；Moreover, the voltage regulator circuit includes the second resistance for adjusting the input voltage.
Described 3rd resistor one end is connect with the ground terminal of the power switch chip, the other end and the power switch core
The current protection threshold value setting end of piece connects, for adjusting the overcurrent protection threshold value of the power switch chip.
Preferably, the voltage regulator circuit further includes filter capacitor and zener diode；Wherein, described second resistance one end with
The forward end of the zener diode connects, other end ground connection；The filter capacitor is in parallel with the zener diode；It is described
The backward end of zener diode is connect with the input terminal of the power switch chip；The forward end of the zener diode with it is described
The ground terminal of power switch chip connects.
Preferably, the second resistance and the 3rd resistor are variable resistance.
It preferably, further include input filter capacitor and output filter capacitor；Wherein, described input filter capacitor one end and institute
State the backward end connection of zener diode, other end ground connection；Described output filter capacitor one end and the power switch chip
Output end connection, the other end ground connection.
It preferably, further include first resistor, described first resistor one end is connect with the power switch chip input terminal, separately
One end is by selecting switch to connect with the enable end of the power switch chip or ground terminal.
Compared with prior art, the utility model has the beneficial effects that the utility model uses a kind of overload protecting circuit, packet
It includes: voltage regulator circuit, power switch chip and 3rd resistor.Voltage regulator circuit is connect with the input terminal of power switch chip, for
Power switch chip provides stable input voltage；Moreover, voltage regulator circuit includes the second resistance for adjusting input voltage.The
Three resistance one end are connect with the ground terminal of power switch chip, and end is arranged in the current protection threshold value of the other end and power switch chip
Connection, for adjusting the overcurrent protection threshold value of power switch chip.The overload protecting circuit can adjust the range of input voltage,
And meet the requirement of high pressure fast charge power supply and equipment.
Detailed description of the invention
Fig. 1 is a kind of overload protecting circuit figure.
Specific embodiment
The utility model is described in further detail below with reference to test example and specific embodiment.But it should not be by this
The range for being interpreted as the above-mentioned theme of the utility model is only limitted to embodiment below, all to be realized based on the content of the present invention
Technology belongs to the scope of the utility model.
Embodiment 1
The utility model, overload protecting circuit, as shown in Figure 1, comprising: voltage regulator circuit, power switch chip U1 and third
Resistance R3.
Wherein, voltage regulator circuit is connect with the input terminal 5 of power switch chip U1, steady for providing to power switch chip U1
Fixed input voltage；Moreover, voltage regulator circuit includes the second resistance R2 for adjusting input voltage.
The one end 3rd resistor R3 is connect with the ground terminal 2 of power switch chip, the electric current of the other end and power switch chip
It protects threshold value setting end 3 to connect, according to the range of the input voltage of power switch chip U1, changes the resistance value of 3rd resistor R3,
The overcurrent protection threshold value of power switch chip U1 is adjusted with this.
Specifically, when the current value of power switch chip U1 output end 1 reaches the overcurrent protection threshold value of power switch chip,
Power switch chip interior overcurrent protection logic is triggered, so that the output for switch chip of cutting off the power, reaches overcurrent protection.
Voltage regulator circuit further includes filter capacitor C1 and zener diode Z1, wherein the one end second resistance R2 and zener diode
The forward end of Z1 connects, other end ground connection.Filter capacitor C1 is in parallel with zener diode Z1.The backward end of zener diode Z1
It is connect with the input terminal 5 of power switch chip U1, the forward end of zener diode Z1 and the ground terminal 2 of power switch chip U1 connect
It connects.Input power forms stable voltage at the both ends filter capacitor C1 through voltage regulator circuit；Also, voltage regulator circuit is by the stable electricity
Pressure is supplied to power switch chip U1.By changing the resistance value size of second resistance R2, to the input electricity of power switch chip U1
Pressure range is adjusted.
Wherein, second resistance R2 and 3rd resistor R3 is variable resistance, specially variable resistance, convenient for straight in circuit
The resistance value for adjusting second resistance R2 and 3rd resistor R3 is connect, the replacement of circuit element is avoided.
The overload protecting circuit further includes input filter capacitor C3 and output filter capacitor C2, wherein input filter capacitor
The one end C3 is connect with the backward end of zener diode Z1, other end ground connection.The one end output filter capacitor C2 and power switch core
The output end 1 of piece U1 connects, other end ground connection.Load one end LOAD is connect with the output end 1 of power switch chip U1, another
One end ground connection.
The overload protecting circuit further includes first resistor R1, the one end first resistor R1 and power switch chip U1 input terminal 5
Connection, the other end is by selecting switch to connect with the enable end 4 of power switch chip U1 or ground terminal 2.When power switch chip
When U1 input terminal 5 is connected by first resistor R1 with its enable end 4, the output of power switch chip U1 is enabled effective.Work as electricity
When source switch chip U1 input terminal 5 is connected by first resistor R1 with its enable end 4, then the output of power switch chip U1 makes
It can be prohibited.
Claims (5)
1. a kind of overload protecting circuit characterized by comprising voltage regulator circuit, power switch chip and 3rd resistor；
The voltage regulator circuit is connect with the input terminal of the power switch chip, for providing stabilization to the power switch chip
Input voltage；Moreover, the voltage regulator circuit includes the second resistance for adjusting the input voltage；
Described 3rd resistor one end is connect with the ground terminal of the power switch chip, the other end and the power switch chip
Current protection threshold value is arranged end and connects, for adjusting the overcurrent protection threshold value of the power switch chip.
2. a kind of overload protecting circuit according to claim 1, which is characterized in that the voltage regulator circuit further includes filtered electrical
Appearance and zener diode；Wherein, described second resistance one end is connect with the forward end of the zener diode, another termination
Ground；The filter capacitor is in parallel with the zener diode；The backward end of the zener diode and the power switch chip
Input terminal connection；The forward end of the zener diode is connect with the ground terminal of the power switch chip.
3. a kind of overload protecting circuit according to claim 2, which is characterized in that the second resistance and third electricity
Resistance is variable resistance.
4. a kind of overload protecting circuit according to claim 2 or 3, which is characterized in that further include input filter capacitor and
Output filter capacitor；Wherein, described input filter capacitor one end is connect with the backward end of the zener diode, another termination
Ground；Described output filter capacitor one end is connect with the output end of the power switch chip, other end ground connection.
5. a kind of overload protecting circuit according to claim 1, which is characterized in that it further include first resistor, described first
Resistance one end connect with the power switch chip input terminal, and the other end is made by selection switch with the power switch chip
It can end or ground terminal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821350005.7U CN208539556U (en) | 2018-08-21 | 2018-08-21 | A kind of overload protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821350005.7U CN208539556U (en) | 2018-08-21 | 2018-08-21 | A kind of overload protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208539556U true CN208539556U (en) | 2019-02-22 |
Family
ID=65377771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821350005.7U Active CN208539556U (en) | 2018-08-21 | 2018-08-21 | A kind of overload protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208539556U (en) |
-
2018
- 2018-08-21 CN CN201821350005.7U patent/CN208539556U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |