CN-114512953-B - Voltage bandpass device and power supply circuit

CN114512953BCN 114512953 BCN114512953 BCN 114512953BCN-114512953-B

Abstract

The application provides a voltage band-pass device and a power circuit, and relates to the technical field of voltage detection. The first voltage selection module is electrically connected with the second voltage selection module, the first voltage selection module and the second voltage selection module are respectively and electrically connected with the power input end, the state output end and the voltage stabilizing module, wherein the first voltage selection module is used for being conducted when the voltage of the power input end is larger than a first voltage value, the second voltage selection module is used for being conducted when the voltage of the power input end is larger than a second voltage value, the first voltage value is larger than the second voltage value, the state output end is used for outputting a first signal when the first voltage selection module and the second voltage selection module are conducted or are both cut off, and the state output end is also used for outputting a second signal when the first voltage selection module is cut off and the second voltage selection module is conducted. The voltage bandpass device and the power supply circuit provided by the application have the advantages of low cost and more flexible use.

Inventors

SHEN JIGUANG
FENG WENBIN
LIAO QING
ZHU ZANLIN
ZHONG SHENG

Assignees

广州导远电子科技有限公司

Dates

Publication Date: 20260505
Application Date: 20220218

Claims (14)

1. A voltage bandpass device is characterized by comprising a power input end, a first voltage selection module, a second voltage selection module, a voltage stabilizing module and a state output end, wherein the first voltage selection module is electrically connected with the second voltage selection module, the first voltage selection module and the second voltage selection module are respectively and electrically connected with the power input end, the state output end and the voltage stabilizing module, The first voltage selection module is used for being conducted when the voltage of the power supply output end is larger than a first voltage value, the second voltage selection module is used for being conducted when the voltage of the power supply output end is larger than a second voltage value, and the first voltage value is larger than the second voltage value; The state output end is used for outputting a first signal when the first voltage selection module and the second voltage selection module are both on or both off; the state output end is also used for outputting a second signal when the first voltage selection module is cut off and the second voltage selection module is conducted; the first voltage selection module comprises a first voltage detection unit and a first switch unit, wherein the first voltage detection unit is respectively and electrically connected with the power input end and the first switch unit, the first switch unit is also electrically connected with the power input end, the voltage stabilizing module and the state output end, The first voltage detection unit is used for detecting the voltage of the power supply output end; The first switch unit is used for being conducted when the voltage of the power supply output end is larger than the first voltage value; the first switch unit comprises a first switch tube, a second switch tube and a third resistor, wherein a first end of the first switch tube is connected with the voltage stabilizing module, a control end of the first switch tube is electrically connected with the first voltage detecting unit, a second end of the first switch tube is electrically connected with one end of the third resistor and a control end of the second switch tube respectively, a first end of the second switch tube and the other end of the third resistor are electrically connected with the state output end, and a second end of the second switch tube is electrically connected with the power input end.
2. The voltage bandpass device according to claim 1, wherein the first voltage detecting unit comprises a first resistor and a second resistor, one end of the first resistor and one end of the second resistor connected in series are electrically connected with the power input terminal, the other end of the first resistor and the second resistor are grounded, and the first switch unit is connected between the first resistor and the second resistor.
3. The voltage bandpass device according to claim 1, wherein the first switching tube comprises an NPN triode, the second switching tube comprises a PNP triode, an emitter of the first switching tube is connected with the voltage stabilizing module, a base of the first switching tube is electrically connected with the first voltage detecting unit, a collector of the first switching tube is electrically connected with one end of the third resistor and a base of the second switching tube respectively, an emitter of the second switching tube and the other end of the third resistor are electrically connected with the state output end, and a collector of the second switching tube is electrically connected with the power input end.
4. The voltage bandpass device of claim 1 wherein the second voltage selection module includes a second voltage detection unit and a second switching unit, the second voltage detection unit being electrically connected to the power input, the second switching unit being further electrically connected to the power input, the voltage regulation module, and the status output, respectively, wherein, The second voltage detection unit is used for detecting the voltage of the power supply output end; The second switch unit is used for being conducted when the voltage of the power supply output end is larger than the second voltage value.
5. The voltage bandpass device according to claim 4, wherein the second voltage detecting unit comprises a fourth resistor and a fifth resistor, one end of the fourth resistor and the fifth resistor connected in series is electrically connected to the power input terminal, the other end is grounded, and the second switching unit is connected between the fourth resistor and the fifth resistor.
6. The voltage bandpass device of claim 5 wherein the first voltage selection module comprises a first voltage detection unit comprising a first resistor and a second resistor, the ratio of the first resistor to the second resistor being greater than the ratio of the fourth resistor to the fifth resistor.
7. The voltage bandpass device according to claim 5, wherein the second switching unit comprises a third switching tube, a fourth switching tube, a sixth resistor and a seventh resistor, the control end of the third switching tube is electrically connected with the voltage stabilizing module, the first end of the third switching tube is electrically connected with the second voltage detecting unit, the second end of the third switching tube is electrically connected with the control end of the fourth switching tube, the first end of the fourth switching tube is grounded, the second end of the fourth switching tube is electrically connected with one end of the sixth resistor, the other end of the sixth resistor is electrically connected with the state output end, one end of the seventh resistor and the first voltage selecting module, and the other end of the seventh resistor is electrically connected with the power input end.
8. The voltage bandpass device according to claim 7, wherein the third switching tube comprises a PNP triode, the fourth switching tube comprises an NPN triode, a base of the third switching tube is electrically connected with the voltage stabilizing module, an emitter of the third switching tube is electrically connected with the second voltage detecting unit, a collector of the third switching tube is electrically connected with the base of the fourth switching tube, an emitter of the fourth switching tube is grounded, and a collector of the fourth switching tube is electrically connected with one end of the sixth resistor.
9. The voltage bandpass device of claim 1 further comprising an eighth resistor having one end electrically connected to the power input and the other end electrically connected to the voltage regulator module.
10. The voltage bandpass device according to claim 1, wherein the voltage stabilizing module comprises a voltage stabilizing diode, an anode of the voltage stabilizing diode is grounded, and a cathode of the voltage stabilizing diode is electrically connected with the first voltage selecting module and the second voltage selecting module, respectively.
11. A power supply circuit comprising a switch and a voltage bandpass device according to any one of claims 1 to 10, the switch being electrically connected to a state output of the voltage bandpass device, the switch being electrically connected to the power supply input, the switch further being for connecting a load, The switch is used for being turned off when receiving a first signal and turned on when receiving a second signal.
12. The power circuit of claim 11, wherein the switch comprises a MOS transistor, a gate of the MOS transistor being electrically connected to a state output of the voltage bandpass converter.
13. The power circuit of claim 11, further comprising a detection module electrically coupled to the switch to detect whether the power circuit is operating properly.
14. The power circuit of claim 13, wherein the detection module comprises a ninth resistor and an LED, one end of the ninth resistor connected in series with the LED is electrically connected to the switch, and the other end is grounded.

Description

Voltage bandpass device and power supply circuit Technical Field The application relates to the technical field of voltage detection, in particular to a voltage bandpass device and a power supply circuit. Background In recent years, electronic voltage products are increasing, and there is a problem that voltage is unstable in designing a power supply, and a circuit needs to face overvoltage or undervoltage conditions. When the input voltage is higher than the maximum voltage which can be borne by the electronic product, the electronic product can be burnt, and when the voltage is lower than the minimum voltage for normal operation, the circuit can be in an uncertain state. Therefore, the input voltage needs to be detected and protected. At present, a TVS tube is one of important protection means, but the TVS tube has limitations in that when an input voltage overvoltage exists all the time, the TVS tube is burned out and cannot be recovered, and the influence caused by the undervoltage cannot be avoided. In addition, the MCU can be used for detecting and protecting the input voltage, but the cost is high and the detection is inflexible. In summary, the detection and protection of the input voltage in the prior art has the problems of high cost and inflexibility. Disclosure of Invention The application aims to provide a voltage band-pass device and a power supply, which are used for solving the problems of high cost and inflexibility in detecting and protecting input voltage in the prior art. In order to achieve the above object, the technical scheme adopted by the embodiment of the application is as follows: In one aspect, the embodiment of the application provides a voltage bandpass device, which comprises a power input end, a first voltage selection module, a second voltage selection module, a voltage stabilizing module and a state output end, wherein the first voltage selection module is electrically connected with the second voltage selection module, the first voltage selection module and the second voltage selection module are respectively electrically connected with the power input end, the state output end and the voltage stabilizing module, The first voltage selection module is used for being conducted when the voltage of the power input end is larger than a first voltage value, the second voltage selection module is used for being conducted when the voltage of the power input end is larger than a second voltage value, and the first voltage value is larger than the second voltage value; The state output end is used for outputting a first signal when the first voltage selection module and the second voltage selection module are both on or both off; the state output end is also used for outputting a second signal when the first voltage selection module is cut off and the second voltage selection module is conducted. Optionally, the first voltage selecting module includes a first voltage detecting unit and a first switch unit, the first voltage detecting unit is electrically connected with the power input end and the first switch unit, the first switch unit is also electrically connected with the power input end, the voltage stabilizing module and the state output end, The first voltage detection unit is used for detecting the voltage of the power input end; The first switch unit is used for being conducted when the voltage of the power input end is larger than the first voltage value. Optionally, the first voltage detection unit includes a first resistor and a second resistor, one end of the first resistor and one end of the second resistor after being connected in series are electrically connected with the power input end, the other end of the first resistor and the second resistor are grounded, and the first switch unit is connected between the first resistor and the second resistor. Optionally, the first switch unit includes first switch tube, second switch tube and third resistance, the first end of first switch tube with voltage stabilizing module is connected, the control end of first switch tube with first voltage detection unit electricity is connected, the second end of first switch tube respectively with the one end of third resistance the control end electricity of second switch tube is connected, the first end of second switch tube the other end of third resistance all with state output end electricity is connected, the second end of second switch tube with power input end electricity is connected. Optionally, the first switching tube includes NPN triode, the second switching tube includes PNP triode, the projecting pole of first switching tube with voltage stabilizing module is connected, the base of first switching tube with first voltage detection unit electricity is connected, the collecting electrode of first switching tube respectively with the one end of third resistance the base electricity of second switching tube is connected, the projecting pole of second switching tube the othe