CN218958795U - Module for quick response to voltage drop - Google Patents
Module for quick response to voltage drop Download PDFInfo
- Publication number
- CN218958795U CN218958795U CN202223322745.9U CN202223322745U CN218958795U CN 218958795 U CN218958795 U CN 218958795U CN 202223322745 U CN202223322745 U CN 202223322745U CN 218958795 U CN218958795 U CN 218958795U
- Authority
- CN
- China
- Prior art keywords
- triode
- resistor
- voltage
- module
- output
- 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
Images
Landscapes
- Control Of Voltage And Current In General (AREA)
Abstract
The utility model aims to provide a module which has a simple structure and is independent of an MCU and can work independently and rapidly responds to voltage drop. The utility model comprises a diode, a capacitor, a trigger triode, an output triode and a current limiting resistor, wherein an external power supply is connected with the anode of the diode, the anode of the capacitor and the emitter of the trigger triode are connected with the cathode of the diode, the base of the trigger triode is connected with the external power supply, the collector of the trigger triode and the base of the output triode are connected with one end of the current limiting resistor, the emitter of the output triode, the cathode of the capacitor and the other end of the current limiting resistor are connected with the system ground, and the collector of the output triode is connected with an external circuit. The utility model is applied to the technical field of electronic circuits.
Description
Technical Field
The utility model is applied to the technical field of electronic circuits, and particularly relates to a module for quickly responding to voltage drop.
Background
With the rapid development of electronic circuit technology, the precision degree of electronic equipment is increasingly improved, and higher requirements are put on the voltage stability of a power supply. Good power supply is a necessary condition for stable operation of the electronic device. Any voltage jitter can have a detrimental effect on the electronic components in the device, and serious and even irreversible damage can occur. Therefore, the electronic device needs to continuously monitor the power supply voltage, and once the power supply voltage is found to rise or fall by a certain value within a period of time, the system makes countermeasures, and closes or cuts off the power supply of important parts to protect the precise electronic circuit, so as to protect the electronic device from serious damage.
In the past, a path of voltage is mostly pulled out from a power supply to an MCU (micro control unit), the MCU obtains the current voltage through sampling of an ADC (analog-digital converter) of the MCU, and a program judges whether the power supply voltage fluctuates or not by judging the rising or falling amplitude of the voltage, so that other circuits of the system are controlled. Although the cost of the method is low, the disadvantage is obvious that when the power supply voltage is inconsistent with the set voltage value, the whole system cannot work, the normal operation can be realized only by modifying the firmware code and then re-burning the firmware code into the MCU, and the method is troublesome, and some electronic equipment does not have the MCU and does not have the condition of using the method. If a module which has a simple structure and is independent of an MCU and can work independently and responds to voltage drop quickly is provided, the problem can be well solved.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing the module which has a simple structure, does not depend on an MCU and can work independently and responds to voltage drop quickly.
The technical scheme adopted by the utility model is as follows: the utility model comprises a diode, a capacitor, a trigger triode, an output triode and a current limiting resistor, wherein an external power supply is connected with the anode of the diode, the anode of the capacitor and the emitter of the trigger triode are connected with the cathode of the diode, the base of the trigger triode is connected with the external power supply, the collector of the trigger triode and the base of the output triode are connected with one end of the current limiting resistor, the emitter of the output triode, the cathode of the capacitor and the other end of the current limiting resistor are connected with the system ground, and the collector of the output triode is connected with an external circuit.
Further, the module for fast response to voltage drop further comprises a first resistor, one end of the first resistor is connected with an external power supply, and the other end of the first resistor is connected with the base electrode of the triode.
Further, the module for fast responding to voltage drop further comprises a second resistor, one end of the second resistor is connected with the base electrode of the output triode, and the other end of the second resistor is connected with one end of the current limiting resistor.
Further, the trigger triode is a PNP triode.
Further, the output triode is an NPN triode.
The beneficial effects of the utility model are as follows: the utility model has simple structure, can directly trigger other circuits through the state change of the trigger triode and the output triode to protect the whole system, has high response speed, is suitable for wider power input voltage, can normally work only within the limit working parameters of the device, can independently work without depending on MCU, and can be integrated into all electronic equipment needing to detect voltage drop.
Drawings
Fig. 1 is a schematic circuit configuration of the present utility model.
Detailed Description
As shown in fig. 1, in this embodiment, the present utility model includes a diode D1, a capacitor C1, a triac Q1, an output transistor Q2, and a current limiting resistor R3, where an external power source is connected to an anode of the diode D1, an anode of the capacitor C1 and an emitter of the triac Q1 are both connected to a cathode of the diode D1, a base of the triac Q1 is connected to an external power source, a collector of the triac Q1 and a base of the output transistor Q2 are both connected to one end of the current limiting resistor R3, an emitter of the output transistor Q2, a cathode of the capacitor C1, and the other end of the current limiting resistor R3 are both connected to a system ground, and a collector of the output transistor Q2 is connected to an external circuit. The current at the power input end can flow forward through the diode D1 to the positive electrode of the capacitor C1, and the current cannot flow from the positive electrode of the capacitor C1 to the power input end through the diode D1 due to the unidirectional conduction characteristic of the diode; the collector of the output triode Q2 is the output end of the circuit of the utility model and can be connected to other circuits of the system.
In this embodiment, the module for fast response to voltage drop further includes a first resistor R1, one end of the first resistor R1 is connected to an external power source, and the other end of the first resistor R1 is connected to the base of the triac Q1.
In this embodiment, the module for fast response to voltage drop further includes a second resistor R2, one end of the second resistor R2 is connected to the base of the output triode Q2, and the other end of the second resistor R2 is connected to one end of the current limiting resistor R3.
In this embodiment, the triac Q1 is a PNP type triode.
In this embodiment, the output transistor Q2 is an NPN transistor.
In this embodiment, the working principle of the present utility model is as follows:
when the input end of the external power supply is connected to the system power supply (wherein the system power supply is a dc voltage), current flows through the diode D1 to the positive electrode of the capacitor C1, and charges the capacitor C1. The cathode voltage of the diode D1 is always lower than its anode voltage, i.e. its cathode voltage is always lower than the power supply input voltage, due to the voltage drop of the diode itself. After the current passes through the first resistor R1 from the power input terminal, since the triac is PNP, and since the cathode voltage of the diode D1 is always lower than the power input voltage, the base and emitter of the triac Q1 are in a reverse bias state, so that the current cannot flow from the first resistor R1 through the base of the triac Q1. At this time, the triac Q1 is in an off state, and no current flows between the emitter and the collector thereof.
The collector of the triac Q1 is pulled down to a voltage near system ground by the current limiting resistor R3 while no current flows through the current limiting resistor R3. Similarly, since the output transistor Q2 is NPN-type, its emitter is connected to the system ground, its base is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the connection point between the collector of the triac Q1 and the current limiting resistor R3, no current flows between the base and the emitter of the output transistor Q2, and the output transistor Q2 is in an off state. The collector of the output transistor Q2 is connected to the output of the circuit of the utility model so that the output is not pulled down to system ground and the output can be pulled up to the desired voltage by an externally connected circuit.
When the power input voltage starts to drop, the positive voltage of the capacitor C1 does not drop along with the power input voltage and maintains the initial voltage because of the absence of other discharge loops. When the power input voltage drops by a magnitude greater than the voltage drop of the diode D1, the power input voltage, that is, the anode voltage of the diode D1 is lower than the cathode voltage thereof, causes the diode D1 to be in a reverse cut-off state. Since the emitter of the triac Q1 is connected to the cathode of the diode D1, the base thereof is connected to the power input terminal through the first resistor R1, and the base and the emitter of the triac Q1 are in a forward bias state at this time, and current can enter from the emitter of the triac Q1 and flow out from the base thereof, and at this time, the triac Q1 enters from an off state to an on state, and current can enter from the emitter thereof, flow through the triac Q1 and be output from the collector thereof.
Since one end of the current limiting resistor R3 is connected to the collector of the triac Q1 and the other end is connected to the system ground, the voltage at the connection point of the collector of the triac Q1 and the current limiting resistor R3 starts to rise. Because the base electrode of the output triode Q2 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the connection point of the collector electrode of the trigger triode Q1 and the current limiting resistor R3, current can enter from the base electrode thereof, flow through the output triode Q2 and then flow out from the emitter electrode thereof. The output transistor Q2 goes from an off state to an on state, and current may flow in from its collector and out from its emitter.
The output end of the circuit is in an open collector state and is pulled to a required voltage through an external pull-up resistor. When the output transistor Q2 is turned off, no current flows through its collector, so the voltage at the output terminal is determined by an external pull-up resistor. When the output transistor Q2 is in the on state, a current flows through its collector, so that the voltage at the output terminal is pulled down to system ground by the output transistor Q2. This change of state may trigger other circuits directly to protect the entire system or be captured by the MCU of the system.
Claims (5)
1. A module for quick response to a voltage sag, characterized by: the high-voltage power supply comprises a diode (D1), a capacitor (C1), a trigger triode (Q1), an output triode (Q2) and a current-limiting resistor (R3), wherein an external power supply is connected with the anode of the diode (D1), the anode of the capacitor (C1) and the emitter of the trigger triode (Q1) are connected with the cathode of the diode (D1), the base of the trigger triode (Q1) is connected with the external power supply, the collector of the trigger triode (Q1) and the base of the output triode (Q2) are connected with one end of the current-limiting resistor (R3), the emitter of the output triode (Q2), the cathode of the capacitor (C1) and the other end of the current-limiting resistor (R3) are connected with the system ground, and the collector of the output triode (Q2) is connected with an external circuit.
2. A module for fast response to voltage drops according to claim 1, characterized in that: the module for rapidly responding to voltage drop further comprises a first resistor (R1), one end of the first resistor (R1) is connected with an external power supply, and the other end of the first resistor (R1) is connected with the base electrode of the triode for triggering (Q1).
3. A module for fast response to voltage drops according to claim 1, characterized in that: the module for fast response to voltage drop further comprises a second resistor (R2), one end of the second resistor (R2) is connected with the base electrode of the output triode (Q2), and the other end of the second resistor (R2) is connected with one end of the current limiting resistor (R3).
4. A module for fast response to voltage drops according to claim 1, characterized in that: the trigger triode (Q1) is a PNP triode.
5. A module for fast response to voltage drops according to claim 1, characterized in that: the output triode (Q2) is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223322745.9U CN218958795U (en) | 2022-12-12 | 2022-12-12 | Module for quick response to voltage drop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223322745.9U CN218958795U (en) | 2022-12-12 | 2022-12-12 | Module for quick response to voltage drop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218958795U true CN218958795U (en) | 2023-05-02 |
Family
ID=86140502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223322745.9U Active CN218958795U (en) | 2022-12-12 | 2022-12-12 | Module for quick response to voltage drop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218958795U (en) |
-
2022
- 2022-12-12 CN CN202223322745.9U patent/CN218958795U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6735064B2 (en) | Inrush current suppressing device | |
| CN212183126U (en) | Reverse connection prevention protection circuit with soft start | |
| CN111146928A (en) | Regulating circuit and BUCK circuit | |
| CN218958795U (en) | Module for quick response to voltage drop | |
| TWI640162B (en) | Reset circuit and related electronic device | |
| CN112448379B (en) | Surge protection circuit | |
| CN203537357U (en) | Simple time delay switching circuit | |
| CN113746312B (en) | Current-limiting protection circuit of bipolar process switching power supply | |
| CN109066598A (en) | A kind of low level triggering latching circuit | |
| CN110518543B (en) | Short-circuit protection circuit and power supply system | |
| CN203691701U (en) | Device for controlling input surge current of LED module | |
| CN219960101U (en) | Input overvoltage protection control circuit | |
| CN1734269A (en) | low-voltage detection circuit | |
| CN218940939U (en) | Direct-current power supply slow start circuit | |
| CN218071468U (en) | Low level reset circuit with reset chip function | |
| CN116707504B (en) | Negative pressure switch control circuit and method | |
| CN217931906U (en) | Voltage peak value holding circuit of lightning protection element | |
| CN219181182U (en) | Overvoltage protection circuit | |
| CN216721291U (en) | PMOS tube switch control circuit with leakage protection | |
| CN213243521U (en) | Power supply circuit | |
| CN112865770A (en) | Low-level reset circuit with chip reset function and low-level reset method | |
| CN218897166U (en) | DC power supply surge protection circuit | |
| CN215772532U (en) | Overvoltage turn-off circuit | |
| CN219611336U (en) | Current protection circuit | |
| CN220022624U (en) | Overvoltage protection circuit for input power supply of automobile parts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |