CN210572476U - IC power supply detection circuit - Google Patents
IC power supply detection circuit Download PDFInfo
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- CN210572476U CN210572476U CN201921015792.4U CN201921015792U CN210572476U CN 210572476 U CN210572476 U CN 210572476U CN 201921015792 U CN201921015792 U CN 201921015792U CN 210572476 U CN210572476 U CN 210572476U
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Abstract
The utility model discloses a IC power supply detection circuitry, first input voltage value is greater than second input voltage value, and first input voltage's output is connected with bleeder circuit's input electricity, and bleeder circuit's output is connected with comparison amplifier's in-phase input electricity, and second input voltage is connected with comparison amplifier's inverting input electricity, and comparison amplifier's output is connected with output circuit's input electricity, and output circuit's output is connected with IC chip's input electricity. The first input voltage and the second input voltage are respectively output to two different input ends of the comparison amplifier, so that the mutual supervision process between the first input voltage and the second input voltage is realized, and if the voltage value of the first input voltage is reduced or the voltage value of the second input voltage is increased, the comparison amplifier outputs a fault signal to the IC chip, so that the IC chip can conveniently carry out the next protection or preventive measure.
Description
Technical Field
The utility model relates to an electronic equipment's technical field especially relates to a IC power supply detection circuitry.
Background
The pulse width closing control circuit of the power chip and the LED power supply detection indicating circuit both need a power supply to carry out a power supply process, and if the voltage value of the power supply changes, related electronic elements may be damaged secondarily.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned technique, the utility model provides a control and IC power supply detection circuitry who protects power supply circuit.
In order to achieve the above object, the utility model relates to a IC power supply detection circuit, including first input voltage, second input voltage, bleeder circuit, comparison amplifier, output circuit and IC chip, first input voltage value is greater than second input voltage value, first input voltage's output with bleeder circuit's input electricity is connected, bleeder circuit's output with comparison amplifier's in-phase input electricity is connected, second input voltage with comparison amplifier's inverting input electricity is connected, comparison amplifier's output with output circuit's input electricity is connected, output circuit's output with IC chip's input electricity is connected.
The input voltage value of the first input voltage is 12V, and the input voltage value of the second input voltage is 5V.
The voltage divider circuit comprises a resistor R1, a resistor R2 and a capacitor C1, wherein the resistor R1 has the same resistance value as the resistor R2, the input end of the resistor R1 is connected with the first input voltage, the output end of the resistor R1 is respectively connected with the input end of the resistor R2, the input end of the capacitor C1 and the non-inverting input end of the comparison amplifier, and the output end of the resistor R2 and the output end of the capacitor C1 are both grounded.
The output circuit comprises a capacitor C2, one end of the capacitor C2 is respectively connected with the output end of the comparison amplifier and the input end of the IC chip, and the other end of the capacitor C2 is grounded.
The IC power supply detection circuit further comprises a feedback resistor R3 and a feedback resistor R4, wherein one end of the feedback resistor R3 is connected in parallel with the non-inverting input end of the comparison amplifier to input the first input voltage; one end of the feedback resistor R4 is connected with the inverting input end of the comparison amplifier in parallel to input the second input voltage; the other end of the feedback resistor R3 and the other end of the feedback resistor R4 are connected with the output end of the comparison amplifier in parallel to be connected into the output circuit.
The utility model has the advantages that:
compared with the prior art, the utility model discloses a IC power supply detection circuitry exports two different inputs of comparison amplifier respectively through with first input voltage and second input voltage to realized the mutual supervision process between first input voltage and the second input voltage, if the magnitude of voltage of first input voltage reduces or the magnitude of voltage of second input voltage risees, comparison amplifier will be to IC chip output fault signal, in order to make things convenient for the IC chip to carry out protection or precaution on next step.
Drawings
Fig. 1 is a schematic circuit diagram of the IC power supply detection circuit of the present invention.
The main element symbols are as follows:
1. a voltage dividing circuit; 2. an output circuit; 3. an IC chip.
Detailed Description
In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, the utility model relates to a IC power supply detection circuitry, including first input voltage, second input voltage, bleeder circuit 1, comparison amplifier U1, output circuit 2 and IC chip 3, first input voltage value is greater than second input voltage value, first input voltage's output is connected with bleeder circuit 1's input electricity, bleeder circuit 1's output is connected with comparison amplifier U1's the non inverting input electricity, second input voltage is connected with comparison amplifier U1's inverting input electricity, comparison amplifier U1's output is connected with output circuit 2's input electricity, output circuit 2's output is connected with IC chip 3's input electricity.
Compared with the prior art, the utility model discloses a IC power supply detection circuitry exports two different inputs of comparison amplifier U1 respectively through with first input voltage and second input voltage to realized the mutual supervision process between first input voltage and the second input voltage, if the magnitude of voltage of first input voltage reduces or the magnitude of voltage of second input voltage risees, comparison amplifier U1 will be to IC chip 3 output fault signal, in order to make things convenient for IC chip 3 to carry out protection or precaution on next step. The +12V voltage is divided into 6V by the resistors R1 and R2 and is added to the pin 3 of the non-inverting input terminal of U1, and the pin 2 of the inverting input terminal is directly connected with the +5V voltage. When the +5V and the +12V are normal, the pin 1 at the output end of the comparison amplifier U1 is at high level, and the circuit is not affected. When +5V rises or +12V falls, the comparison amplifier U1 will turn over, and the output pin goes to low level 0V, so it can be determined that +5V or +12V has a fault.
In this embodiment, the input voltage value of the first input voltage is +12V, and the input voltage value of the second input voltage is + 5V. +12V and +5V are the voltage input value commonly used of electronic equipment power supply, of course, the utility model discloses not limit to the contrast of above-mentioned two kinds of voltage value and detect, also can be other voltage value and detect.
In this embodiment, the voltage divider circuit 1 includes a resistor R1, a resistor R2, and a capacitor C1, wherein the resistor R1 has the same resistance value as the resistor R2, an input terminal of the resistor R1 is connected to the first input voltage, an output terminal of the resistor R1 is connected to an input terminal of the resistor R2, an input terminal of the capacitor C1, and a non-inverting input terminal of the comparator U1, and an output terminal of the resistor R2 and an output terminal of the capacitor C1 are both grounded. The resistance of the resistor R1 is the same as that of the resistor R2, 12V input voltage is converted into two paths of 6V output voltage, and the difference of the resistance between 6V and 5V is not large, so that the comparison process is easier to show if small change occurs.
In the present embodiment, the output circuit 2 includes a capacitor C2, one end of the capacitor C2 is connected to the output terminal of the comparison amplifier U1 and the input terminal of the IC chip 3, and the other end of the capacitor C2 is grounded. The capacitor C1 and the capacitor C2 mainly play a stabilizing role.
In this embodiment, the IC power supply detection circuit further includes a feedback resistor R3 and a feedback resistor R4, wherein one end of the feedback resistor R3 is connected in parallel with the non-inverting input terminal of the comparison amplifier U1 to input the first input voltage; one end of the feedback resistor R4 is connected with the inverting input end of the comparison amplifier U1 in parallel to input a second input voltage; the other end of the feedback resistor R3 and the other end of the feedback resistor R4 are connected in parallel with the output end of the comparison amplifier U1 and connected into the output circuit 2. The feedback resistors R3 and R4 are mainly used in combination with the comparison amplifier U1, and can better display the magnification.
The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides a IC power supply detection circuit, its characterized in that, includes first input voltage, second input voltage, bleeder circuit, comparison amplifier, output circuit and IC chip, first input voltage value is greater than second input voltage value, first input voltage's output with bleeder circuit's input electricity is connected, bleeder circuit's output with comparison amplifier's noninverting input end electricity is connected, second input voltage with comparison amplifier's inverting input end electricity is connected, comparison amplifier's output with output circuit's input electricity is connected, output circuit's output with IC chip's input electricity is connected.
2. The IC power supply detection circuit of claim 1, wherein the first input voltage has an input voltage value of 12V and the second input voltage has an input voltage value of 5V.
3. The IC power supply detection circuit of claim 2, wherein the voltage divider circuit comprises a resistor R1, a resistor R2, and a capacitor C1, the resistor R1 has the same resistance as the resistor R2, the input terminal of the resistor R1 is connected to the first input voltage, the output terminal of the resistor R1 is connected to the input terminal of the resistor R2, the input terminal of the capacitor C1, and the non-inverting input terminal of the comparator amplifier, and the output terminal of the resistor R2 and the output terminal of the capacitor C1 are both grounded.
4. The IC power supply detection circuit of claim 1, wherein the output circuit comprises a capacitor C2, one end of the capacitor C2 is connected to the output terminal of the comparison amplifier and the input terminal of the IC chip, and the other end of the capacitor C2 is connected to ground.
5. The IC power supply detection circuit according to claim 1, further comprising a feedback resistor R3 and a feedback resistor R4, wherein one end of the feedback resistor R3 is connected in parallel with the non-inverting input terminal of the comparison amplifier to input the first input voltage; one end of the feedback resistor R4 is connected with the inverting input end of the comparison amplifier in parallel to input the second input voltage; the other end of the feedback resistor R3 and the other end of the feedback resistor R4 are connected with the output end of the comparison amplifier in parallel to be connected into the output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015792.4U CN210572476U (en) | 2019-07-02 | 2019-07-02 | IC power supply detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921015792.4U CN210572476U (en) | 2019-07-02 | 2019-07-02 | IC power supply detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210572476U true CN210572476U (en) | 2020-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921015792.4U Active CN210572476U (en) | 2019-07-02 | 2019-07-02 | IC power supply detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210572476U (en) |
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2019
- 2019-07-02 CN CN201921015792.4U patent/CN210572476U/en active Active
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