CN216959309U

CN216959309U - Alternating current surge detection protection circuit

Info

Publication number: CN216959309U
Application number: CN202122915032.2U
Authority: CN
Inventors: 张导
Original assignee: Foshan Novotech Photoelectric Technology Co ltd
Current assignee: Foshan Novotech Photoelectric Technology Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-07-12
Anticipated expiration: 2031-11-25

Abstract

The utility model discloses an alternating current surge detection protection circuit, relating to the technical field of protection circuits and comprising: the voltage stabilizing circuit comprises a direct current high voltage division detection circuit and an N-channel MOS tube driving control circuit, wherein a voltage stabilizing tube ZD2 is electrically connected between the direct current high voltage division detection circuit and the N-channel MOS tube driving control circuit. Has the advantages that: by connecting the voltage regulator tube ZD2, the surge protection circuit has the characteristics of high precision, low cost and difficult damage, achieves a more accurate and reliable surge instantaneous peak protection circuit scheme, is superior to the absorption instantaneous high voltage of a simple piezoresistor, and also avoids the hidden trouble of peak voltage crosstalk of a rear-stage circuit caused by a simple resistor voltage division detection circuit so as to protect the rear-stage electric appliance from being burnt and damaged when the 220V household power grid has the instantaneous high voltage, and has wide application range.

Description

Alternating current surge detection protection circuit

Technical Field

The utility model relates to the technical field of protection circuits, in particular to an alternating current surge detection protection circuit.

Background

With the development of electronic technology and more applications, electronic products need high-quality power supplies and power supplies with complete protection functions. Meanwhile, with the increase of electrical appliances, various interference signals in the power grid and the fluctuation of the power grid exist in large quantity, and particularly when high-power electrical appliances are arranged around, such as the starting of a motor, the sudden wave condition of the power grid is obvious. In this case, the surge, that is, the voltage transient increase phenomenon increases. The common surge absorption device is a piezoresistor, the device can absorb a certain instantaneous high-voltage spike, but when the duration is short and the precision requirement is higher, the device cannot meet the requirement, and a conventional overvoltage protection circuit cannot detect the instantaneous spike and provide effective protection. It is therefore necessary to develop new transient spike detection and protection circuits.

On the other hand, the existing requirements of high reliability and low cost are required, and the reliability and the reject ratio of a product are determined by a complete protection circuit. Therefore, when the power supply environment of the electronic product is complex, the power supply of the complete protection circuit is the requirement of people and the basic requirement of the product. Filtering out various error signals which may be generated from the outside, solving and effectively protecting the error signals are necessary for electronic engineers and are also required as good circuit rigor.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the related art, the utility model aims to provide an alternating current surge detection protection circuit which has the circuit characteristics of high precision, low cost and difficult damage by connecting a voltage regulator tube ZD2, achieves a more accurate and reliable surge instantaneous peak protection circuit scheme, is superior to the absorption instantaneous high voltage of a simple piezoresistor, and avoids the hidden trouble of peak voltage crosstalk of a rear-stage circuit caused by a simple resistor voltage division detection circuit, so that rear-stage electric appliances are protected from being burnt and damaged when the instantaneous high voltage exists in a 220V household power grid, the application range is wide, and the technical problems in the prior related art are solved.

The technical scheme of the utility model is realized as follows:

an ac surge detection protection circuit comprising: the voltage stabilizing circuit comprises a direct current high voltage division detection circuit and an N-channel MOS tube driving control circuit, wherein a voltage stabilizing tube ZD2 is electrically connected between the direct current high voltage division detection circuit and the N-channel MOS tube driving control circuit.

Further, the dc high voltage division detection circuit includes: resistance-capacitance RC1, resistance-capacitance RC2, resistance-capacitance RC3, resistance-capacitance RC4, resistance-capacitance RC5 and resistance-capacitance RC6, wherein the pin of resistance-capacitance RC1 is electrically connected with the pin of resistance-capacitance RC2, the pin of resistance-capacitance RC2 is electrically connected with the pin of resistance-capacitance RC3, the pin of resistance-capacitance RC4 is electrically connected with the pin of resistance-capacitance RC5, the pin of resistance-capacitance RC5 is electrically connected with the pin of resistance-capacitance RC6, and the pin of resistance-capacitance RC5 and the pin of resistance-capacitance RC6 are electrically connected with the pin of voltage regulator tube ZD 2.

Furthermore, the pin of the resistance-capacitance RC1, the pin of the resistance-capacitance RC5 and the pin of the resistance-capacitance RC6 are respectively and electrically connected to the anode Uin of the rectifier bridge input circuit, and the pin of the resistance-capacitance RC6 is grounded VGND.

Further, the N-channel MOS transistor driving control circuit includes: the resistor R16, the nonpolar capacitor CM1, the voltage regulator tube ZD3, the MOS tube M1 and the resistor R15, wherein a pin ZD2 of the voltage regulator tube is electrically connected with a pin ZD 16 of the resistor, a pin R16 of the resistor is electrically connected with a pin CM1 of the nonpolar capacitor, a pin CM1 of the nonpolar capacitor is electrically connected with a pin ZD3 of the voltage regulator tube, a pin ZD3 of the voltage regulator tube is connected with a pin M1 of the MOS tube, and a pin M1 of the MOS tube is connected with a pin R15 of the resistor.

Further, the resistor R16 pin is electrically connected to the electrical network node DR 1.

Furthermore, the pin of the MOS transistor M1 is electrically connected to the detection circuit control and the ground VGND of the protection circuit, respectively.

Further, the pin of the resistor R15 is electrically connected to a power supply VCC.

Further, the MOS transistor M1 is a MOS transistor of model 2N 2007.

The utility model has the beneficial effects that:

the surge transient peak protection circuit has the advantages of high precision, low cost and difficult damage by accessing the voltage stabilizing tube ZD2, achieves a more accurate and reliable surge transient peak protection circuit scheme, is superior to the absorption transient high voltage of a simple voltage dependent resistor, and avoids the hidden danger of peak voltage crosstalk of a post-stage circuit caused by a simple resistor voltage division detection circuit, so that the post-stage electric appliance is protected from being burnt and damaged when the transient high voltage exists in a 220V household power grid, and the application range is wide.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 circuit diagram of an ac surge detection protection circuit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

According to an embodiment of the present invention, an ac surge detection protection circuit is provided.

As shown in fig. 1, an ac surge detection protection circuit includes: the device comprises a direct current high voltage division detection circuit and an N-channel MOS tube driving control circuit, wherein a voltage stabilizing tube ZD2 is electrically connected between the direct current high voltage division detection circuit and the N-channel MOS tube driving control circuit.

In addition, the dc high voltage division detection circuit includes: resistance-capacitance RC1, resistance-capacitance RC2, resistance-capacitance RC3, resistance-capacitance RC4, resistance-capacitance RC5 and resistance-capacitance RC6, wherein the pin of resistance-capacitance RC1 is electrically connected with the pin of resistance-capacitance RC2, the pin of resistance-capacitance RC2 is electrically connected with the pin of resistance-capacitance RC3, the pin of resistance-capacitance RC4 is electrically connected with the pin of resistance-capacitance RC5, the pin of resistance-capacitance RC5 is electrically connected with the pin of resistance-capacitance RC6, and the pin of resistance-capacitance RC5 and the pin of resistance-capacitance RC6 are electrically connected with the pin of voltage regulator tube ZD 2.

The pin of the resistor-capacitor RC1, the pin of the resistor-capacitor RC5 and the pin of the resistor-capacitor RC6 are respectively and electrically connected with the anode Uin of the rectifier bridge input circuit, and the pin of the resistor-capacitor RC6 is grounded VGND.

In addition, the drive control circuit of the N-channel MOS tube comprises: the resistor R16, the nonpolar capacitor CM1, the voltage regulator tube ZD3, the MOS tube M1 and the resistor R15, wherein a pin ZD2 of the voltage regulator tube is electrically connected with a pin ZD 16 of the resistor, a pin R16 of the resistor is electrically connected with a pin CM1 of the nonpolar capacitor, a pin CM1 of the nonpolar capacitor is electrically connected with a pin ZD3 of the voltage regulator tube, a pin ZD3 of the voltage regulator tube is connected with a pin M1 of the MOS tube, and a pin M1 of the MOS tube is connected with a pin R15 of the resistor.

Wherein the pin of the resistor R16 is electrically connected to the electrical network node DR 1; the pin M1 of the MOS transistor is respectively and electrically connected with a detection circuit control and a grounding VGND of the protection circuit; the pin of the resistor R15 is electrically connected with a power supply VCC; the MOS transistor M1 is a MOS transistor of model 2N 2007.

In the technical scheme, the voltage regulator tube ZD2 is a 7.5V high-precision voltage regulator tube and is a value of a current-end voltage division ratio Uin, namely when the reverse voltage of the voltage regulator tube is close to a critical value of the reverse voltage, the reverse current is suddenly increased and is called breakdown, and at the critical breakdown point, the reverse resistance is suddenly reduced to a very small value. The voltage across the diode is substantially stabilized around the breakdown voltage despite the wide range of current variations, thereby achieving the voltage stabilization function of the diode. This then requires a stable voltage value to be given to electrical network node DR 1.

In addition, the detection circuit control of the protection circuit is connected to the main control unit circuit of the power supply product of the product, namely a fault abnormal closing signal. The access requirement is low level active protection. The power supply main control chip IC can be accessed, and the MCU singlechip can also be used as an input detection signal of the main control unit circuit.

Specifically, because Uin is a fluctuating power frequency signal, which has a large error, and the switching driving voltage of the MOS transistor is within a range, which causes the signal of Uin to be inaccurate, after the voltage regulator is added, only when the detected high-voltage signal rises and reaches a certain degree, and when the reverse breakdown voltage of the voltage regulator diode is reached, the reverse current of the voltage regulator diode increases, Uout forms a high-current switching signal, which can make the MOS transistor conduct indiscriminately, thereby making the control (control signal) signal change from high level to low level. At this moment, the signal forms an effective switching signal, so the purposes of easy detection and effective protection are necessarily achieved. And the precision of the voltage stabilizing tube can be selected to be 1 percent and 2 percent. And the reliable operation of the product is achieved by matching with a protection locking circuit at the later stage.

In summary, with the above technical solution of the present invention, the following effects can be achieved: through inserting voltage regulator ZD2, have the precision height, low cost and not fragile circuit characteristics, and reached more accurate reliable sudden wave instantaneous peak protection circuit scheme, be superior to simple piezo-resistor's the instantaneous high pressure of absorption, also avoided simple resistance partial pressure detection circuit, lead to the hidden danger that peak voltage crosstalks the latter stage circuit to reach protection latter stage electrical apparatus can not burnt out and damage when having instantaneous high pressure in the 220V domestic electric wire netting, the range of application is wide.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An ac surge detection protection circuit, comprising: the voltage stabilizing circuit comprises a direct current high voltage division detection circuit and an N-channel MOS tube driving control circuit, wherein a voltage stabilizing tube ZD2 is electrically connected between the direct current high voltage division detection circuit and the N-channel MOS tube driving control circuit.

2. The ac surge detection protection circuit of claim 1, wherein said dc high voltage divider detection circuit comprises: resistance-capacitance RC1, resistance-capacitance RC2, resistance-capacitance RC3, resistance-capacitance RC4, resistance-capacitance RC5 and resistance-capacitance RC6, wherein the pin of resistance-capacitance RC1 is electrically connected with the pin of resistance-capacitance RC2, the pin of resistance-capacitance RC2 is electrically connected with the pin of resistance-capacitance RC3, the pin of resistance-capacitance RC4 is electrically connected with the pin of resistance-capacitance RC5, the pin of resistance-capacitance RC5 is electrically connected with the pin of resistance-capacitance RC6, and the pin of resistance-capacitance RC5 and the pin of resistance-capacitance RC6 are electrically connected with the pin of voltage regulator tube ZD 2.

3. The ac surge detection protection circuit of claim 2, wherein the pin RC1, the pin RC5 and the pin RC6 are electrically connected to the positive electrode Uin of the rectifier bridge input circuit, respectively, and the pin RC6 is grounded VGND.

4. The ac surge detection protection circuit of claim 3, wherein said N-channel MOS transistor drive control circuit comprises: the circuit comprises a resistor R16, a nonpolar capacitor CM1, a voltage regulator tube ZD3, a MOS tube M1 and a resistor R15, wherein a pin ZD2 of the voltage regulator tube is electrically connected with a pin ZD 16 of the resistor, a pin ZD 16 of the resistor is electrically connected with a pin ZD 1 of the nonpolar capacitor, a pin ZD 1 of the nonpolar capacitor is electrically connected with a pin ZD3 of the voltage regulator tube, a pin ZD3 of the voltage regulator tube is connected with a pin ZD 1 of the MOS tube, and a pin M1 of the MOS tube is connected with a pin ZD 15 of the resistor.

5. The AC surge detection protection circuit according to claim 4, wherein said resistor R16 pin is electrically connected to electrical network node DR 1.

6. The AC surge detection protection circuit of claim 5, wherein the pins M1 of the MOS transistor are electrically connected to the detection circuit control and ground VGND of the protection circuit, respectively.

7. The AC surge detection protection circuit according to claim 6, wherein said resistor R15 pin is electrically connected to a power supply VCC.

8. The ac surge detection protection circuit according to claim 7, wherein said MOS transistor M1 is a model 2N2007 MOS transistor.