CN219695283U - Simple input voltage detection circuit - Google Patents
Simple input voltage detection circuit Download PDFInfo
- Publication number
- CN219695283U CN219695283U CN202321165048.9U CN202321165048U CN219695283U CN 219695283 U CN219695283 U CN 219695283U CN 202321165048 U CN202321165048 U CN 202321165048U CN 219695283 U CN219695283 U CN 219695283U
- Authority
- CN
- China
- Prior art keywords
- resistor
- field effect
- grounded
- voltage detection
- effect tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000005669 field effect Effects 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 7
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 206010014357 Electric shock Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a simple input voltage detection circuit which is used for voltage detection and comprises a field effect tube Q4, a photoelectric coupler IC3 and a triode Q5, wherein one path of a grid electrode of the field effect tube Q4 is connected with a power input end through a resistor R35 and a resistor R40 in sequence, the other path of the grid electrode of the field effect tube Q4 is grounded through a resistor R36, the grid electrode of the field effect tube Q4 is grounded through a voltage stabilizing tube ZD4, the grid electrode of the field effect tube Q4 is grounded through a capacitor C14, and a drain electrode of the field effect tube Q4 is connected with a power supply end VCC through a resistor R37. In order to eliminate potential safety hazards in the background technology, the simple input voltage detection circuit is added into the power supply, and a signal is given to the control panel, so that people can more intuitively see whether the power supply is supplying power or not, and the power supply is prevented from touching.
Description
Technical Field
The utility model belongs to the technical field of voltage detection, and particularly relates to a simple input voltage detection circuit.
Background
Along with the increasing precision requirement of the current electronic equipment, the stability requirement on a driving power supply is higher, wherein ripple voltage is an important evaluation index, in order to meet the effect of low ripple, the capacity of an electrolytic capacitor at an output end is increased to improve the ripple, but the voltage at the output end is always kept unchanged under no-load condition due to the increase of the electrolytic capacitor, so that people cannot judge whether the power supply is electrified or not, the risk of electric shock exists, and particularly, the power supply for medical treatment is easier to generate safety accidents.
Accordingly, the above problems are further improved.
Disclosure of Invention
The utility model mainly aims to provide a simple input voltage detection circuit, which is added into a power supply in order to eliminate potential safety hazards in the background technology, and a signal is given to a control panel, so that people can more intuitively see whether the power supply is supplying power or not, and the power supply is prevented from touching.
In order to achieve the above objective, the present utility model provides a simple input voltage detection circuit for voltage detection, comprising a field effect transistor Q4, a photo coupler IC3 and a triode Q5, wherein:
one path of the grid electrode of the field effect tube Q4 is connected with a power input end (AC-L) through a resistor R35 and a resistor R40 in sequence, the other path of the grid electrode of the field effect tube Q4 is grounded (primary ground) through a resistor R36, the grid electrode of the field effect tube Q4 is grounded (primary ground) through a voltage stabilizing tube ZD4, the grid electrode of the field effect tube Q4 is grounded (primary ground) through a capacitor C14, and the drain electrode of the field effect tube Q4 is connected with a power supply end VCC (of a power chip) through a resistor R37;
the anode of the photoelectric coupler IC3 is connected with the source electrode of the field effect transistor Q4, the cathode of the photoelectric coupler IC3 is grounded (primary ground), the collector of the photoelectric coupler IC3 is electrically connected with the base electrode of the triode Q5, a resistor R42 and a resistor R44 are connected between the base electrode and the emitter electrode of the triode Q5, the common connection end of the resistor R42 and the resistor R44 is connected with the power supply output end Vout, and the collector electrode of the triode Q5 is connected with the control panel signal receiving end MCU.
As a further preferable aspect of the above technical solution, a cathode of the voltage regulator ZD4 is electrically connected to a gate of the field effect transistor Q4 and an anode of the voltage regulator ZD4 is grounded.
As a further preferable embodiment of the above-described embodiment, the emitter of the photocoupler IC3 is grounded (secondary ground).
As a further preferable embodiment of the foregoing technical solution, the power input terminal is an input voltage L line or an N line.
The utility model has the beneficial effects that:
the utility model is realized by controlling the on-off of a PNP triode, after the power supply is electrified, the input alternating current AC-L is divided by resistors R35, R36 and R40 to charge C14, when the voltage of C14 reaches the on threshold voltage of Q4, Q4 is conducted, VCC voltage is conducted by a current limiting resistor R37 to conduct an optocoupler, meanwhile, Q5 is conducted along with the on-off, the main output Vout of the power supply is high level through a triode Q5, and the signal receiving end MCU of the test control board can judge that the power supply is in an electrified state at the moment; when the power supply is powered off, the Q4 is in a cut-off state, the optocoupler cannot be turned on, at the moment, the Q5 is in a cut-off state because the B pole and the E pole are in equipotential, and the MCU presents a low level, so that the power supply can be judged to be in a powered-off state at the moment.
The circuit has simple structure, the selected devices are low-voltage devices, the cost is low, the implementation is convenient, and the energizing state of the power supply can be intuitively judged.
Drawings
Fig. 1 is a circuit diagram of a simple input voltage detection circuit of the present utility model.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
The utility model discloses a simple input voltage detection circuit, and the following describes the specific embodiment of the utility model further by combining with the preferred embodiment.
In embodiments of the present utility model, those skilled in the art will note that the power input and power supply terminals, etc., to which the present utility model relates may be considered prior art.
Preferred embodiments.
The utility model discloses a simple input voltage detection circuit, which is used for voltage detection and comprises a field effect transistor Q4, a photoelectric coupler IC3 and a triode Q5, wherein:
one path of the grid electrode of the field effect tube Q4 is connected with a power input end (AC-L) through a resistor R35 and a resistor R40 in sequence, the other path of the grid electrode of the field effect tube Q4 is grounded (primary ground) through a resistor R36, the grid electrode of the field effect tube Q4 is grounded (primary ground) through a voltage stabilizing tube ZD4, the grid electrode of the field effect tube Q4 is grounded (primary ground) through a capacitor C14, and the drain electrode of the field effect tube Q4 is connected with a power supply end VCC (of a power chip) through a resistor R37;
the anode of the photoelectric coupler IC3 is connected with the source electrode of the field effect transistor Q4, the cathode of the photoelectric coupler IC3 is grounded (primary ground), the collector of the photoelectric coupler IC3 is electrically connected with the base electrode of the triode Q5, a resistor R42 and a resistor R44 are connected between the base electrode and the emitter electrode of the triode Q5, the common connection end of the resistor R42 and the resistor R44 is connected with the power supply output end Vout, and the collector electrode of the triode Q5 is connected with the control panel signal receiving end MCU.
Specifically, the cathode of the voltage regulator ZD4 is electrically connected to the gate of the field effect transistor Q4 and the anode of the voltage regulator ZD4 is grounded.
More specifically, the emitter of the photocoupler IC3 is grounded (secondary ground).
More specifically, the power input terminal is an input voltage L line or an input voltage N line.
The principle of the utility model is as follows:
the utility model has the advantages that: after the power supply is electrified, the input alternating current AC-L is divided by resistors R35, R36 and R40 to charge C14, when the voltage of C14 reaches the starting threshold voltage of Q4, Q4 is conducted, VCC voltage is conducted through a current limiting resistor R37 to enable the optocoupler to be conducted, meanwhile Q5 is conducted along with the voltage, the main output Vout of the power supply is high level through a triode Q5, and the MCU at the signal receiving end of the test control panel can be judged to be in an electrified state at the moment; when the power supply is powered off, the Q4 is in a cut-off state, the optocoupler cannot be turned on, at the moment, the Q5 is in a cut-off state because the B pole and the E pole are in equipotential, and the MCU presents a low level, so that the power supply can be judged to be in a powered-off state at the moment.
The circuit has simple structure, the selected devices are low-voltage devices, the cost is low, the implementation is convenient, and the energizing state of the power supply can be intuitively judged.
It is noted that the control board signal receiving end MCU cannot carry heavy load, but can carry current within 10mA, and the triode Q5 can be damaged due to the large current. The capacity of the capacitor C14 is guaranteed to be more than 1UF, and too small a capacity can cause Q4 to be not fully turned on.
It should be noted that technical features such as a power input end and a power supply end related to the present application should be considered as the prior art, and specific structures, working principles, and control modes and spatial arrangement related to the technical features may be conventional choices in the art, and should not be considered as the utility model point of the present application, which is not further specifically described in detail.
Modifications of the embodiments described above, or equivalents of some of the features may be made by those skilled in the art, and any modifications, equivalents, improvements or etc. within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.
Claims (4)
1. The utility model provides a simple and easy type input voltage detection circuit for voltage detection, its characterized in that includes field effect transistor Q4, photoelectric coupler IC3 and triode Q5, wherein:
one path of the grid electrode of the field effect tube Q4 is connected with the power input end through a resistor R35 and a resistor R40 in sequence, the other path of the grid electrode of the field effect tube Q4 is grounded through a resistor R36, the grid electrode of the field effect tube Q4 is grounded through a voltage stabilizing tube ZD4, the grid electrode of the field effect tube Q4 is grounded through a capacitor C14, and the drain electrode of the field effect tube Q4 is connected with a power supply end VCC through a resistor R37;
the anode of the photoelectric coupler IC3 is connected with the source electrode of the field effect transistor Q4, the cathode of the photoelectric coupler IC3 is grounded, the collector of the photoelectric coupler IC3 is electrically connected with the base electrode of the triode Q5, a resistor R42 and a resistor R44 are connected between the base electrode and the emitter electrode of the triode Q5, the common connection end of the resistor R42 and the resistor R44 is connected with a power supply output end Vout, and the collector of the triode Q5 is connected with a control board signal receiving end MCU.
2. The simple input voltage detection circuit according to claim 1, wherein a cathode of the regulator ZD4 is electrically connected to a gate of the field-effect transistor Q4 and an anode of the regulator ZD4 is grounded.
3. The simple input voltage detection circuit according to claim 2, wherein the emitter of the photo coupler IC3 is grounded.
4. The simple input voltage detection circuit of claim 1, wherein the power input terminal is an input voltage L line or an input voltage N line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321165048.9U CN219695283U (en) | 2023-05-12 | 2023-05-12 | Simple input voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321165048.9U CN219695283U (en) | 2023-05-12 | 2023-05-12 | Simple input voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219695283U true CN219695283U (en) | 2023-09-15 |
Family
ID=87965619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321165048.9U Active CN219695283U (en) | 2023-05-12 | 2023-05-12 | Simple input voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219695283U (en) |
-
2023
- 2023-05-12 CN CN202321165048.9U patent/CN219695283U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN218633427U (en) | Power supply for low-voltage sensor | |
| CN207926438U (en) | DC power supply | |
| CN203574531U (en) | A mos transistor drive circuit based on high-frequency oscillation signals | |
| CN104079158A (en) | Ultra-low static power consumption power source starting control circuit | |
| CN107733413B (en) | Intelligent switch circuit and intelligent terminal of pre-installation battery system | |
| CN219695283U (en) | Simple input voltage detection circuit | |
| CN211785743U (en) | Output current sampling circuit of switching power supply | |
| CN212304746U (en) | Reverse connection prevention protection circuit | |
| CN215990185U (en) | Overvoltage protection circuit and electrical equipment | |
| CN115411925A (en) | Flyback switching power supply starting conduction control circuit and device | |
| CN205160047U (en) | Overvoltage crowbar and device | |
| CN210724292U (en) | Lithium battery charger with multi-mode charging function | |
| CN107968643A (en) | A kind of DC load singly-bound touch control on-off circuit | |
| CN208836096U (en) | An a kind of key switch electromechanics road | |
| CN202652057U (en) | Supply circuit for quick start of integrated circuit | |
| CN208707337U (en) | A kind of mobile power source circuit for cooperating with Lightning plug | |
| CN207939194U (en) | A kind of overvoltage crowbar | |
| CN216647204U (en) | Low-power consumption control circuit | |
| CN201467324U (en) | Low power consumption CPU standby commutation circuit | |
| CN212726878U (en) | Circuit for improving dynamic response of primary PSR power supply chip | |
| CN221351723U (en) | Connection detection circuit without common ground | |
| CN219247525U (en) | Low-loss charging circuit | |
| CN213126545U (en) | Energy-saving control circuit of backlight source | |
| CN214850935U (en) | Switch power supply circuit of electric energy meter | |
| CN216851735U (en) | Power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |