CN212012132U - High-voltage input overvoltage and undervoltage protection circuit - Google Patents
High-voltage input overvoltage and undervoltage protection circuit Download PDFInfo
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- CN212012132U CN212012132U CN202021022313.4U CN202021022313U CN212012132U CN 212012132 U CN212012132 U CN 212012132U CN 202021022313 U CN202021022313 U CN 202021022313U CN 212012132 U CN212012132 U CN 212012132U
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Abstract
The utility model provides a high-voltage input excessive pressure undervoltage protection circuit belongs to the power electronic technology, and this excessive pressure undervoltage protection circuit includes reference voltage circuit, sampling circuit, output enable circuit and protection circuit, and output enable circuit is used for comparing reference voltage signal and input voltage signal, and output enable signal is with the operating condition of control DC/DC converter. The utility model discloses can provide accurate high-pressure input excessive pressure undervoltage protection for electronic equipment, the circuit is simple, easily realize.
Description
Technical Field
The utility model belongs to the power electronic technology especially relates to a high-voltage input excessive pressure undervoltage protection circuit.
Background
DC-DC is a device for converting the electric energy of one voltage value into the electric energy of another voltage value in a direct current circuit, which is constructed by assembling a small surface mount integrated circuit and a micro electronic component into a whole by using the microelectronic technology. In the prior art, many DC/DC power modules do not have input overvoltage and undervoltage protection, or the input overvoltage and undervoltage protection range is too wide, so that the DC/DC power modules are easily damaged due to input voltage fluctuation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of high-pressure input excessive pressure under-voltage protection circuit includes reference voltage circuit, sampling circuit, output enable circuit and protection circuit, and output enable circuit is used for comparing reference voltage signal and input voltage signal, and output enable signal is with the operating condition of control DC/DC converter. The utility model discloses can provide accurate high-pressure input excessive pressure undervoltage protection for electronic equipment, the circuit is simple, easily realize.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
the utility model provides a high voltage input overvoltage under-voltage protection circuit includes reference voltage circuit, sampling circuit and output enable circuit, wherein: the reference voltage circuit is used for transmitting a reference voltage signal to the output enabling circuit and comprises a voltage stabilizing chip, a first resistor and a second resistor; the sampling circuit is used for transmitting an input voltage signal to the output enabling circuit and comprises a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor; the output enabling circuit is used for comparing the reference voltage signal with the input voltage signal and outputting an enabling signal to control the working state of the DC/DC converter, and comprises a comparator; one end of the voltage stabilizing chip is connected with a power supply through a first resistor and a second resistor in sequence, and the other end of the voltage stabilizing chip is grounded; the fourth resistor and the fifth resistor are connected in series and are arranged between a power supply and the ground, and the sixth resistor and the seventh resistor are connected in series and are arranged between the power supply and the ground; the OUTA port of the comparator is used for outputting an enabling signal, the INA-port of the comparator is connected with the output end of the voltage stabilizing chip, the INA + port of the comparator is grounded through a seventh resistor, the GND port of the comparator is grounded, the VCC port of the comparator is connected with the power supply through a first resistor, the OUTB port of the comparator is used for outputting the enabling signal, the INB-port of the comparator is grounded through a fifth resistor, and the INB + port of the comparator is connected with the output end of the voltage stabilizing chip.
Preferably, the protection circuit further comprises a protection circuit composed of a first capacitor and a third resistor, wherein the first capacitor is arranged between the VCC port of the comparator and the ground, and the third resistor is arranged between the first resistor and the OUTA port of the comparator.
Preferably, the model of the voltage stabilizing chip is TL 431.
Preferably, the model of the comparator is LM 393.
The utility model discloses a high-voltage input excessive pressure undervoltage protection circuit has following beneficial effect:
1) the protection circuit is simple in structure and convenient to use, outputs the enable signal of low level when the input voltage is below an undervoltage protection point, outputs the enable signal of high level when the input voltage is above the undervoltage protection point and below the overvoltage protection point, and outputs the enable signal of low level when the input voltage is higher than the protection point.
2) The utility model discloses a sampling circuit can adjust wantonly, can set up different excessive pressure undervoltage protection points.
3) The utility model has the advantages of being simple in structure and convenient in operation, the input cost is few, and structural design is reasonable, the operation of being convenient for, excellent in use effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further explained according to the attached drawings:
as shown in fig. 1, the high-voltage input over-voltage and under-voltage protection circuit includes a reference voltage circuit, a sampling circuit, an output enable circuit and a protection circuit, in this embodiment, the reference voltage circuit is configured to transmit a reference voltage signal to the output enable circuit, the sampling circuit is configured to transmit an input voltage signal to the output enable circuit, the output enable circuit is configured to compare the reference voltage signal and the input voltage signal and output an enable signal to control an operating state of the DC/DC converter, and the protection circuit is configured to protect the reference voltage circuit and the output enable circuit.
In the figure, the reference voltage circuit comprises a voltage stabilizing chip U1, a first resistor R1 and a second resistor R2; the sampling circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7; the output enable circuit includes a comparator U2. Specifically, one end of the voltage stabilizing chip U1 is connected to the power source Vin + sequentially through the first resistor R1 and the second resistor R2, and the other end of the voltage stabilizing chip U1 is grounded; the fourth resistor R4 and the fifth resistor R5 are connected in series with each other and are arranged between the power supply Vin + and the ground, and the sixth resistor R6 and the seventh resistor R7 are connected in series with each other and are arranged between the power supply Vin + and the ground; an OUTA port of the comparator U2 is used for outputting an enabling signal, an INA-port of the comparator U2 is connected with an output end of the voltage stabilizing chip U1, an INA + port of the comparator U2 is grounded through a seventh resistor R7, the INA + port is connected between a sixth resistor R6 and a seventh resistor R7, a GND port of the comparator U2 is grounded, a VCC port of the comparator U2 is connected with a power supply Vin + through a first resistor R1, an OUTB port of the comparator U2 is used for outputting the enabling signal, an INB-port of the comparator U2 is grounded through a fifth resistor R5, the INB-port is connected between a fifth resistor R5 and a fourth resistor R4, and the INB + port of the comparator U2 is connected with an output end of the voltage stabilizing chip U1.
It should be noted that the protection circuit is composed of a first capacitor C1 and a third resistor R3, wherein the first capacitor C1 is disposed between the VCC port of the comparator U2 and the ground, and the third resistor R3 is disposed between the first resistor R1 and the OUTA port of the comparator U2.
In this embodiment, the model of the regulator chip U1 is TL431, and the model of the comparator U2 is LM 393.
When the direct current/direct current converter works specifically, high voltage is low voltage through the first resistor R1, power supply voltage and reference voltage of a comparison end are provided for the comparator U2 through the second resistor R2 and the voltage stabilizing chip U1, voltage values of an overvoltage sampling circuit formed by the resistors R4 and R5 and an undervoltage sampling circuit formed by the resistors R6 and R7 are compared with the reference voltage, and the comparator outputs high level voltage or low level voltage signals to control the working state of the direct current/direct current converter. Adopt the utility model relates to a DC/DC converter's excessive pressure undervoltage protection circuit, when input voltage was less than undervoltage protection point or was higher than the overvoltage protection point, comparator U2 exported the low level for electronic equipment is in off-working condition. When the input voltage is between the undervoltage protection point and the overvoltage protection point, the electronic equipment is in a working state.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. The utility model provides a high voltage input overvoltage under-voltage protection circuit which characterized in that, includes reference voltage circuit, sampling circuit and output enable circuit, wherein:
the reference voltage circuit is used for transmitting a reference voltage signal to the output enabling circuit and comprises a voltage stabilizing chip (U1), a first resistor (R1) and a second resistor (R2);
the sampling circuit is used for supplying an input voltage signal to the output enabling circuit and comprises a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7);
the output enabling circuit is used for comparing the reference voltage signal with the input voltage signal and outputting an enabling signal to control the working state of the DC/DC converter, and the output enabling circuit comprises a comparator (U2);
one end of the voltage stabilizing chip (U1) is connected with a power supply (Vin +) sequentially through a first resistor (R1) and a second resistor (R2), and the other end of the voltage stabilizing chip (U1) is grounded;
the fourth resistor (R4) and the fifth resistor (R5) are connected in series with each other and are arranged between a power supply (Vin +) and ground, and the sixth resistor (R6) and the seventh resistor (R7) are connected in series with each other and are arranged between the power supply (Vin +) and ground;
the OUTA port of the comparator (U2) is used for outputting an enabling signal, the INA-port of the comparator (U2) is connected with the output end of the voltage stabilizing chip (U1), the INA + port of the comparator (U2) is grounded through a seventh resistor (R7), the GND port of the comparator (U2) is grounded, the VCC port of the comparator (U2) is connected with a power supply (Vin +) through a first resistor (R1), the OUTB port of the comparator (U2) is used for outputting the enabling signal, the INB-port of the comparator (U2) is grounded through a fifth resistor (R5), and the INB + port of the comparator (U2) is connected with the output end of the voltage stabilizing chip (U1).
2. The protection circuit of claim 1, further comprising a protection circuit consisting of a first capacitor (C1) and a third resistor (R3), wherein the first capacitor (C1) is disposed between VCC port of the comparator (U2) and ground, and the third resistor (R3) is disposed between the first resistor (R1) and OUTA port of the comparator (U2).
3. The high-voltage input over-voltage and under-voltage protection circuit according to claim 1, wherein the model of the voltage regulation chip (U1) is TL 431.
4. The protection circuit of claim 1, wherein the comparator (U2) is LM 393.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021022313.4U CN212012132U (en) | 2020-06-06 | 2020-06-06 | High-voltage input overvoltage and undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021022313.4U CN212012132U (en) | 2020-06-06 | 2020-06-06 | High-voltage input overvoltage and undervoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212012132U true CN212012132U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021022313.4U Active CN212012132U (en) | 2020-06-06 | 2020-06-06 | High-voltage input overvoltage and undervoltage protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212012132U (en) |
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2020
- 2020-06-06 CN CN202021022313.4U patent/CN212012132U/en active Active
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