CN210780069U - Voltage overshoot protection detection circuit - Google Patents
Voltage overshoot protection detection circuit Download PDFInfo
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- CN210780069U CN210780069U CN201921850187.9U CN201921850187U CN210780069U CN 210780069 U CN210780069 U CN 210780069U CN 201921850187 U CN201921850187 U CN 201921850187U CN 210780069 U CN210780069 U CN 210780069U
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The embodiment of the utility model discloses voltage overshoot protection detection circuit, voltage overshoot protection detection circuit includes trigger protection circuit, trigger protection circuit includes stabilivolt D2, stabilivolt D2's negative pole passes through resistance R1 and connects input voltage VCC, and stabilivolt D2's positive pole passes through diode D1 and connects triode Q1's base, and zener diode D2's negative pole, projecting pole ground connection are connected to triode Q1's collecting electrode; the cathode of the zener diode D2 is connected to the post-stage output Vout. The utility model discloses a voltage protection detection circuitry that overshoots, through the quick response who triggers protection circuit, make the rear stage output be 0, protect the rear stage circuit. And the design of the trigger protection circuit is simple, and the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit technique and specifically relates to a voltage overshoot protection detection circuitry.
Background
Overshoot voltage (overshoot) generally refers to the fact that the actual voltage exceeds the normal operating voltage of the circuit or device, and is often of short duration, and is also referred to as transient overshoot voltage. Voltage overshoot can lead to failure of circuit components.
At present, most of the phenomena of power-on overshoot in the circuit adopt a power-on soft start mode to prevent the voltage overshoot from damaging a rear-stage circuit. As shown in fig. 1, when the input end appears a power-on overshoot signal, the single chip turns off the post-stage circuit for a certain time, and turns on the post-stage circuit after the overshoot disappears. Therefore, the soft start time needs to be set according to different characteristics of the circuit, the system delay phenomenon can be caused by the mode, the soft start time needs to be adjusted according to different power-on characteristics, the setting of the time needs to be controlled by a single chip microcomputer, the design is complex, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an in provide a voltage overshoot protection detection circuitry to solve current voltage overshoot detection circuitry structural design complicacy, problem with high costs.
In order to solve the technical problem, the embodiment of the utility model discloses following technical scheme:
the utility model provides a voltage overshoot protection detection circuit, voltage overshoot protection detection circuit includes the trigger protection circuit, the trigger protection circuit includes stabilivolt D2, stabilivolt D2's negative pole passes through resistance R1 and connects input voltage VCC, and stabilivolt D2's positive pole passes through diode D1 and connects triode Q1's base, and zener diode D2's negative pole, projecting pole ground connection are connected to triode Q1's collecting electrode; the cathode of the zener diode D2 is connected to the post-stage output Vout.
Further, the voltage overshoot protection detection circuit further comprises an alarm circuit, the alarm circuit comprises a switch circuit and an alarm unit which are sequentially connected, and the switch circuit is further connected with a trigger protection circuit.
Further, the switch circuit comprises a triode Q2, the base of the triode Q2 is connected with the negative electrode of a zener diode D2, the collector is connected with an input voltage VCC, the emitter is respectively connected with the base of the triode Q3 and one end of a resistor R2, the other end of the resistor R2 is grounded, the emitter of the triode Q3 is connected with the input voltage VCC through a diode D3, and the collector of the triode Q3 is connected with an alarm unit.
Further, the alarm unit comprises a light emitting diode D4, the anode of the light emitting diode D4 is connected with the collector of the triode Q3 through a resistor R3, and the cathode of the light emitting diode D4 is grounded.
Further, the alarm unit comprises a buzzer U1, one end of the buzzer U1 is connected with the collector of the triode Q3, and the other end of the buzzer U1 is grounded.
Further, the voltage overshoot protection detection circuit further comprises an isolation protection circuit, the isolation protection circuit comprises a capacitor C1, one end of the capacitor C1 is connected to the input voltage VCC, and the other end of the capacitor C1 is grounded.
The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and one of the above technical solutions has the following advantages or advantageous effects:
1. the utility model discloses a voltage protection detection circuitry that overshoots, through the quick response who triggers protection circuit, make the rear stage output be 0, protect the rear stage circuit. And the design of the trigger protection circuit is simple, and the cost is reduced.
2. When the input voltage overshoots, the voltage overshoots are subjected to sound-light alarm through the alarm circuit with a simple circuit structure, so that the fluctuation condition of the current input voltage can be conveniently and visually known.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art overshoot protection detection scheme;
fig. 2 is a circuit diagram of overshoot protection detection according to the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
As shown in fig. 2, the utility model discloses a voltage overshoot protection detection circuit includes triggering protection circuit, and triggering protection circuit includes stabilivolt D2, and stabilivolt D2's negative pole passes through resistance R1 and connects input voltage VCC, and stabilivolt D2's positive pole passes through diode D1 and connects triode Q1's base, and triode Q1's collecting electrode is connected zener diode D2's negative pole, and projecting pole ground connection; the cathode of the zener diode D2 is connected to the post-stage output Vout.
The voltage overshoot protection detection circuit further comprises an alarm circuit, the alarm circuit comprises a switch circuit and an alarm unit which are sequentially connected, and the switch circuit is further connected with a trigger protection circuit.
The switching circuit comprises a triode Q2, the base electrode of a triode Q2 is connected with the negative electrode of a voltage stabilizing diode D2, the collector electrode of the triode Q2 is connected with an input voltage VCC, the emitter electrode of the triode Q3 is respectively connected with the base electrode of the triode Q3 and one end of a resistor R2, the other end of the resistor R2 is grounded, the emitter electrode of the triode Q3 is connected with the input voltage VCC through a diode D3, and the collector electrode of the triode Q3 is connected with.
The alarm unit comprises a light-emitting diode D4, the anode of the light-emitting diode D4 is connected with the collector of the triode Q3 through a resistor R3, and the cathode of the light-emitting diode D4 is grounded.
The alarm unit comprises a buzzer U1, one end of the buzzer U1 is connected with the collector of the triode Q3, and the other end of the buzzer U1 is grounded.
The voltage overshoot protection detection circuit further comprises an isolation protection circuit, the isolation protection circuit comprises a capacitor C1, one end of a capacitor C1 is connected with the input voltage VCC, and the other end of the capacitor C1 is grounded.
In the above embodiment, the resistor R1 is 10K, the resistor R2 is 10K, the resistor R3 is 1K, the transistors Q1 and Q2 are S8050, the NPN type transistor, the capacitor C1 is 10nF, the transistor Q3 is S8550, the PNP type transistor has an input voltage VCC of 5V, the diodes D1 and D3 are 1N4007 switching diodes, and the zener voltage of the zener diode D2 is 6V.
The utility model discloses voltage overshoot protection detection circuit's theory of operation does:
when the input voltage VCC overshoots in the future, the input voltage VCC is 5V and is smaller than the zener voltage of the zener diode D2, the zener diode D2 is in a stabilized state, at this time, the Q1 is in a cut-off state, the post-stage output Vout is the input voltage VCC, the triode Q2 is turned on, the triode Q3 is cut off, and the light emitting diode D4 and the buzzer U1 do not work.
When the overshoot occurs, the input voltage VCC is generally greater than 6V and higher than the zener voltage of the zener diode D2, at this time, the zener diode D2 is broken down, the base voltage of the transistor Q1 is high, the transistor Q1 starts to be turned on, the post-stage output Vout is low, and the post-stage circuit is powered off and protected. At this time, the transistor Q2 is in a cut-off state, so that the base level of the transistor Q3 becomes a low voltage, the transistor Q3 starts to be turned on, and the light emitting diode D4 and the buzzer U1 start to work to give an audible and visual alarm.
When the overshoot disappears, the state of the circuit is as the overshoot is temporary, and the output Vout of the later stage is the input voltage VCC.
The utility model discloses a circuit is simple, and the commonality is strong, need not to adopt integrated chip circuit to carry out soft start protection back level output circuit, through discrete conventional circuit component, directly realizes overshoot voltage's protection and detection, and the commonality is strong, and the reliability is high, saving cost that can also be great.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A voltage overshoot protection detection circuit is characterized by comprising a trigger protection circuit, wherein the trigger protection circuit comprises a voltage regulator tube D2, the negative electrode of the voltage regulator tube D2 is connected with an input voltage VCC through a resistor R1, the positive electrode of the voltage regulator tube D2 is connected with the base electrode of a triode Q1 through a diode D1, the collector electrode of the triode Q1 is connected with the negative electrode of a voltage regulator diode D2, and the emitter electrode is grounded; the cathode of the zener diode D2 is connected to the post-stage output Vout.
2. The voltage overshoot protection detection circuit according to claim 1, further comprising an alarm circuit, wherein the alarm circuit comprises a switch circuit and an alarm unit connected in sequence, and the switch circuit is further connected to a trigger protection circuit.
3. The voltage overshoot protection detection circuit according to claim 2, wherein the switching circuit comprises a transistor Q2, a base of the transistor Q2 is connected to a negative electrode of a zener diode D2, a collector is connected to the input voltage VCC, emitters are respectively connected to a base of the transistor Q3 and one end of a resistor R2, the other end of the resistor R2 is grounded, an emitter of the transistor Q3 is connected to the input voltage VCC through a diode D3, and a collector of the transistor Q3 is connected to the alarm unit.
4. The voltage overshoot protection detection circuit according to claim 3, wherein the alarm unit comprises a light emitting diode D4, the anode of the light emitting diode D4 is connected to the collector of the transistor Q3 through a resistor R3, and the cathode of the light emitting diode D4 is grounded.
5. The voltage overshoot protection detection circuit according to claim 3, wherein the alarm unit comprises a buzzer U1, one end of the buzzer U1 is connected to the collector of the transistor Q3, and the other end of the buzzer U1 is grounded.
6. The voltage overshoot protection detection circuit according to claim 1 or 2, further comprising an isolation protection circuit, wherein the isolation protection circuit comprises a capacitor C1, one end of the capacitor C1 is connected to the input voltage VCC, and the other end of the capacitor C1 is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921850187.9U CN210780069U (en) | 2019-10-30 | 2019-10-30 | Voltage overshoot protection detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921850187.9U CN210780069U (en) | 2019-10-30 | 2019-10-30 | Voltage overshoot protection detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210780069U true CN210780069U (en) | 2020-06-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921850187.9U Active CN210780069U (en) | 2019-10-30 | 2019-10-30 | Voltage overshoot protection detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210780069U (en) |
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2019
- 2019-10-30 CN CN201921850187.9U patent/CN210780069U/en active Active
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