CN211239312U - Input undervoltage protection turn-off circuit - Google Patents
Input undervoltage protection turn-off circuit Download PDFInfo
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- CN211239312U CN211239312U CN201922473186.3U CN201922473186U CN211239312U CN 211239312 U CN211239312 U CN 211239312U CN 201922473186 U CN201922473186 U CN 201922473186U CN 211239312 U CN211239312 U CN 211239312U
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Abstract
The utility model discloses an input undervoltage protection turn-off circuit, this circuit includes resistance R1, electric capacity C1, resistance R2, stabiliser A1, resistance R3, zener diode DZ1, resistance R4, resistance R5, power tube Q1, zener diode DZ2, resistance R6, diode D1, diode D2, resistance R7, electrolytic capacitor CD2, diode D3, voltage regulator circuit in advance, electrolytic capacitor CD1 and diode D4. The utility model discloses reliable realization turn-offs the power when electric power automation device input voltage does not reach normal operating voltage, and effective protection electric power automation device does not lead to damaging because of the low pressure starts repeatedly.
Description
Technical Field
The utility model relates to an electric power automation especially relates to an input undervoltage protection turn-off circuit.
Background
At present, different automation devices are widely applied, researched and developed in an electric power system, the working state of staff is improved to a great extent, the automation management level of enterprises such as a power plant is improved, the cost input is reduced, the automation of the electric power system is continuously advanced towards the development direction of intellectualization, and certain defects exist in the reliability of the electric power automation device due to the lagging influence of the traditional power supply mode and equipment. When the input voltage of the power automation device does not reach the normal working voltage, the power automation device has the problem of damage caused by repeated starting due to low voltage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the above background art part mentioned through an input undervoltage protection turn-off circuit.
To achieve the purpose, the utility model adopts the following technical proposal:
an input undervoltage protection turn-off circuit comprises a resistor R1, a capacitor C1, a resistor R2, a voltage stabilizer A1, a resistor R3, a voltage stabilizing diode DZ1, a resistor R4, a resistor R5, a power tube Q1, a voltage stabilizing diode DZ2, a resistor R6, a diode D1, a diode D2, a resistor R7, an electrolytic capacitor CD2, a diode D3, a pre-voltage stabilizing circuit, an electrolytic capacitor CD1 and a diode D4; one end of the resistor R1 is connected with a power supply end VDD, the other end of the resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a reference electrode of a voltage stabilizer A1 and one end of a resistor R6, the other end of the capacitor C1 is connected with the other end of a resistor R2, the anode of a voltage stabilizer A1, one end of a resistor R5 and the emitter of a power tube Q1 are connected with the back ground GND, the cathode of the voltage stabilizer A1 is connected with one end of a resistor R3 and the cathode of a voltage stabilizing diode DZ1, the other end of the resistor R1 is connected with the cathode of the power tube Q1, the collector of the power tube Q1 is connected with the anode of the voltage stabilizing diode DZ1 and the cathode of the diode D1, the cathode of the voltage stabilizing diode DZ1 is connected with the cathode of the diode D1 and the anode of the diode D1, the other end of the resistor R1 is connected with the anode of the diode D1 and the resistor R1 are connected with one end of the diode 1, the other end of the resistor R7 is connected with the anode of the electrolytic capacitor CD2, the first terminal of the pre-voltage stabilizing circuit and the power supply end VCC, the cathode of the electrolytic capacitor CD2 is connected with the second terminal of the pre-voltage stabilizing circuit, the cathode of the electrolytic capacitor CD1 and the transformer S1B and then is grounded to GND, the anode of the diode D3 is connected with the third terminal of the pre-voltage stabilizing circuit, the anode of the electrolytic capacitor CD1 is connected with the fourth terminal of the pre-voltage stabilizing circuit and the cathode of the diode D4, and the anode of the diode D4 is connected with the transformer S1B.
Particularly, the pre-voltage stabilizing circuit comprises a voltage stabilizing diode DZ3, a resistor R8 and a power tube Q2, wherein the anode of the voltage stabilizing diode DZ3 is connected with the anode of an electrolytic capacitor CD1 and the anode of an electrolytic capacitor CD2, the cathode of the voltage stabilizing diode DZ3 is connected with the base of the power tube Q2, the anode of a diode D3 and one end of a resistor R8, the other end of the resistor R8 is connected with the collector of the power tube Q2 and the anode of the electrolytic capacitor CD1, and the emitter of the power tube Q2 is connected with a power supply terminal VCC and the anode of the electrolytic capacitor CD 2.
In particular, the regulator a1 employs a precision adjustable regulator.
In particular, the power transistor Q1 and the power transistor Q2 both use NPN bipolar transistors.
The utility model provides a reliable realization of input undervoltage protection turn-off circuit has turn-off power supply when electric power automation device input voltage does not reach normal operating voltage, and effective protection electric power automation device does not lead to damaging because of the low pressure is started repeatedly.
Drawings
Fig. 1 is a circuit structure diagram for input under-voltage protection shutdown provided by the embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a structural diagram of an input under-voltage protection turn-off circuit according to an embodiment of the present invention. The input undervoltage protection turn-off circuit in the embodiment comprises a resistor R1, a capacitor C1, a resistor R2, a voltage stabilizer A1, a resistor R3, a voltage stabilizing diode DZ1, a resistor R4, a resistor R5, a power tube Q1, a voltage stabilizing diode DZ2, a resistor R6, a diode D1, a diode D2, a resistor R7, an electrolytic capacitor CD2, a diode D3, a pre-voltage stabilizing circuit, an electrolytic capacitor CD1 and a diode D4; one end of the resistor R1 is connected with a power supply end VDD, the other end of the resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a reference electrode of a voltage stabilizer A1 and one end of a resistor R6, the other end of a capacitor C1 is connected with the other end of a resistor R2, the anode of a voltage stabilizer A1, one end of a resistor R5 and the emitter of a power tube Q1 are connected with the back ground GND, the cathode of a voltage stabilizer A1 is connected with one end of a resistor R3 and the cathode of a voltage stabilizing diode DZ1, the other end of a resistor R3 is connected with a VCC, the anode of a voltage stabilizing diode DZ1 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with the other end of a resistor R5 and the base of a power tube Q1, the collector of the power tube Q1 is connected with the anode of a voltage stabilizing diode DZ1 and the cathode of a diode D1, the cathode of a diode D1 is connected with the cathode of the other, the anode of the diode D2 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the anode of the electrolytic capacitor CD2, the first terminal of the pre-voltage stabilizing circuit and the power supply end VCC, the cathode of the electrolytic capacitor CD2 is connected with the second terminal of the pre-voltage stabilizing circuit, the cathode of the electrolytic capacitor CD1 and the transformer S1B and then is grounded GND, the anode of the diode D3 is connected with the third terminal of the pre-voltage stabilizing circuit, the anode of the electrolytic capacitor CD1 is connected with the fourth terminal of the pre-voltage stabilizing circuit and the cathode of the diode D4, and the anode of the diode D4 is connected with the transformer S1B.
Specifically, in this embodiment, the pre-voltage stabilizing circuit includes a zener diode DZ3, a resistor R8, and a power transistor Q2, an anode of the zener diode DZ3 is connected to an anode of an electrolytic capacitor CD1 and an anode of an electrolytic capacitor CD2, a cathode of the zener diode DZ3 is connected to a base of the power transistor Q2, an anode of the diode D3, and one end of the resistor R8, another end of the resistor R8 is connected to a collector of the power transistor Q2 and an anode of the electrolytic capacitor CD1, and an emitter of the power transistor Q2 is connected to a power supply terminal VCC and an anode of the electrolytic capacitor CD 2. Specifically, in this embodiment, the voltage regulator a1 is a precision adjustable voltage regulator. The power tube Q1 and the power tube Q2 both adopt NPN type bipolar transistors.
During operation, VDD is divided by a resistor R1, a resistor R2 and a capacitor C1 and sampled by a voltage stabilizer A1; when the input voltage is greater than the input threshold voltage, the sampling voltage is greater than the reference voltage of a voltage stabilizer A1, the voltage stabilizer A1 outputs a low voltage which is lower than the voltage stabilization value of a voltage stabilizing diode DZ1, so that the voltage divided by a resistor R4 and the resistor R5 to the base electrode of a power tube Q1 is 0V, the power tube Q1 does not act, VCC is normally established, and the power supply normally operates; when the input voltage is less than the input threshold voltage, the sampled voltage is less than the reference voltage of regulator a1, at which time regulator a1 is turned off. VCC supplies power to the base electrode of the power tube Q1 through the resistor R3, the voltage stabilizing diode DZ1 and the resistor R4, bias voltage is formed on the resistor R5, and the power tube Q1 is conducted in a forward bias mode. The power tube Q2, the voltage stabilizing diode DZ3 and the resistor R8 form a pre-voltage stabilizing circuit, the power tube Q1 is conducted, so that pre-voltage stabilizing voltage and VCC voltage are clamped by the resistor R7, the voltage stabilizing diode DZ2, the diode D2 and the diode D3 at a very low voltage which is lower than a VCC threshold value of a PWM chip in the power supply, the power supply stops running, meanwhile, the diode D1 and the resistor R6 form feedback hysteresis, input threshold voltage is raised, and repeated starting of the power supply during low voltage is effectively avoided; the whole circuit is finished, and the purpose of switching off the power supply by input undervoltage protection is achieved.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (4)
1. An input undervoltage protection turn-off circuit is characterized by comprising a resistor R1, a capacitor C1, a resistor R2, a voltage stabilizer A1, a resistor R3, a voltage stabilizing diode DZ1, a resistor R4, a resistor R5, a power tube Q1, a voltage stabilizing diode DZ2, a resistor R6, a diode D1, a diode D2, a resistor R7, an electrolytic capacitor CD2, a diode D3, a pre-voltage stabilizing circuit, an electrolytic capacitor CD1 and a diode D4; one end of the resistor R1 is connected with a power supply end VDD, the other end of the resistor R1 is connected with one end of a capacitor C1, one end of a resistor R2, a reference electrode of a voltage stabilizer A1 and one end of a resistor R6, the other end of the capacitor C1 is connected with the other end of a resistor R2, the anode of a voltage stabilizer A1, one end of a resistor R5 and the emitter of a power tube Q1 are connected with the back ground GND, the cathode of the voltage stabilizer A1 is connected with one end of a resistor R3 and the cathode of a voltage stabilizing diode DZ1, the other end of the resistor R1 is connected with the cathode of the power tube Q1, the collector of the power tube Q1 is connected with the anode of the voltage stabilizing diode DZ1 and the cathode of the diode D1, the cathode of the voltage stabilizing diode DZ1 is connected with the cathode of the diode D1 and the anode of the diode D1, the other end of the resistor R1 is connected with the anode of the diode D1 and the resistor R1 are connected with one end of the diode 1, the other end of the resistor R7 is connected with the anode of the electrolytic capacitor CD2, the first terminal of the pre-voltage stabilizing circuit and the power supply end VCC, the cathode of the electrolytic capacitor CD2 is connected with the second terminal of the pre-voltage stabilizing circuit, the cathode of the electrolytic capacitor CD1 and the transformer S1B and then is grounded to GND, the anode of the diode D3 is connected with the third terminal of the pre-voltage stabilizing circuit, the anode of the electrolytic capacitor CD1 is connected with the fourth terminal of the pre-voltage stabilizing circuit and the cathode of the diode D4, and the anode of the diode D4 is connected with the transformer S1B.
2. The input undervoltage protection turn-off circuit as claimed in claim 1, wherein the pre-voltage regulation circuit comprises a zener diode DZ3, a resistor R8 and a power tube Q2, wherein an anode of the zener diode DZ3 is connected to an anode of an electrolytic capacitor CD1 and an anode of an electrolytic capacitor CD2, a cathode of the zener diode DZ3 is connected to a base of the power tube Q2, an anode of the diode D3 and one end of the resistor R8, the other end of the resistor R8 is connected to a collector of the power tube Q2 and an anode of the electrolytic capacitor CD1, and an emitter of the power tube Q2 is connected to a power supply terminal VCC and an anode of the electrolytic capacitor CD 2.
3. The undervoltage protection shutdown circuit as claimed in claim 1, wherein the voltage regulator a1 is a precision adjustable voltage regulator.
4. The undervoltage protection turn-off circuit as claimed in one of claims 1 to 3, wherein the power transistor Q1 and the power transistor Q2 are NPN bipolar transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922473186.3U CN211239312U (en) | 2019-12-30 | 2019-12-30 | Input undervoltage protection turn-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922473186.3U CN211239312U (en) | 2019-12-30 | 2019-12-30 | Input undervoltage protection turn-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211239312U true CN211239312U (en) | 2020-08-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922473186.3U Active CN211239312U (en) | 2019-12-30 | 2019-12-30 | Input undervoltage protection turn-off circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211239312U (en) |
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2019
- 2019-12-30 CN CN201922473186.3U patent/CN211239312U/en active Active
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