CN212969575U

CN212969575U - Current amplification module and current amplification circuit based on reed switch

Info

Publication number: CN212969575U
Application number: CN202022208436.3U
Authority: CN
Inventors: 周德贵
Original assignee: Hunan Shell Feisi Technology Co ltd
Current assignee: Hunan Shell Feisi Technology Co ltd
Priority date: 2020-10-01
Filing date: 2020-10-01
Publication date: 2021-04-13
Anticipated expiration: 2030-10-01

Abstract

The utility model discloses a current amplification module and a current amplification circuit based on a reed switch, wherein the current amplification module based on the reed switch comprises a switch (S) and a triode (Q) of the reed switch; the triode is an NPN type or PNP type triode; by utilizing the amplification effect of the triode, the current amplification module consisting of the reed switch and the triode can drive the load which needs to be driven by large current. This current amplification module and current amplification circuit structure based on tongue tube are ingenious, and are with low costs, and the practicality is strong.

Description

Current amplification module and current amplification circuit based on reed switch

Technical Field

The utility model relates to a current amplification module and current amplification circuit based on tongue tube.

Background

Reed Switch (Reed Switch) is also called Reed Switch or magnetic Reed Switch, is a special magnetic-sensitive Switch, and is the main part of Reed relay and proximity Switch.

The conventional driving circuit is shown in fig. 1, and requires a large rated current of the switch. The rated current of a common reed switch is generally about 0.1A, if larger current is needed, the size of the common reed switch is large, and the magnet is also large, so that the common reed switch is difficult to install and use.

Therefore, it is necessary to design a current amplification module and a current amplification circuit based on a reed switch.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a current amplification module and current amplification circuit based on tongue tube is provided, this current amplification module and current amplification circuit based on tongue tube simple structure thinks about ingeniously, and is with low costs, and the practicality is strong.

The technical solution of the utility model is as follows:

a current amplification module based on a reed switch comprises a switch (S) and a triode (Q) of the reed switch; the triode is an NPN type triode or a PNP type triode; the switch is a normally open switch or a normally closed switch, and the switch is bridged between the C pole and the B pole of the triode;

for the case where the transistor is an NPN transistor:

the C pole of the triode is used as the input end M of the current amplification module, and the E pole of the triode is used as the output end N of the current amplification module;

for the case where the transistor is a PNP transistor:

the E pole of the triode is used as the input end M of the current amplification module, and the C pole of the triode is used as the output end N of the current amplification module.

The reed switch-based current amplification module further comprises a first diode D, and the cathode and the anode of the first diode are respectively connected with the input end (M) and the output end (N) of the current amplification module. The diode is used for preventing the triode from being broken down reversely.

A current amplification circuit comprises 2 load driving branches which are connected in reverse parallel; the power supply supplies power to the load through the 2 load driving branches which are reversely connected in parallel;

each load driving branch comprises a current amplification module, and the current amplification modules in the 2 load driving branches are connected in opposite directions;

the current amplification module is based on a reed switch.

The load is a direct current brush motor.

Each load driving branch circuit is provided with a second diode, the cathode of the second diode is connected with the input end (M) of the current amplification module, or the anode of the second diode is connected with the output end (N) of the current amplification module.

The diode is used for preventing the two paths from being conducted at the same time.

Has the advantages that:

the utility model discloses a current amplification module and current amplification circuit based on tongue tube utilizes the enlarged characteristic of triode, enlargies the electric current through the triode for the electric current through the tongue tube is less, and output current is very big, can drive motor etc. require great load to the electric current.

And 2 load driving branches which are reversely connected in parallel are adopted, the motor can be driven to rotate reversely and rotate forwardly, the circuit structure is simple, the implementation is easy, the cost is low, and the installation is convenient.

Drawings

FIG. 1 is a schematic diagram of a prior art motor drive circuit;

FIG. 2 is a schematic diagram of a current amplification module based on an NPN transistor and a normally closed switch;

FIG. 3 is a schematic diagram of a current amplification circuit employing a current amplification module based on an NPN transistor and a normally closed switch;

FIG. 4 is a schematic diagram of a current amplification module based on an NPN transistor and a normally closed switch;

FIG. 5 is a schematic diagram of a current amplification module based on an NPN transistor and a normally closed switch;

FIG. 6 is a schematic diagram of a current amplification circuit employing a current amplification module based on an NPN transistor and a normally closed switch;

Detailed Description

The invention will be described in further detail with reference to the following figures and specific embodiments:

example 1: current amplification module based on NPN type triode

As shown in fig. 2, a current amplification module based on a reed switch comprises a normally closed switch S of the reed switch and a triode Q; the triode is an NPN type triode;

the normally closed switch is connected between the C pole and the B pole of the triode in a bridging mode.

The reed switch-based current amplification module further comprises a protection diode (first diode) D, and the cathode and the anode of the protection diode are respectively connected with the input end M and the output end N of the current amplification module.

The emitter of the high-power triode is used for outputting and amplifying the current of the common reed switch, so that the purpose that the common reed switch can be used as a high-current switch is achieved. The current enters from the upper lead as shown in fig. 1, passes through the collector and base of the transistor, and the current flowing through the collector by the amplification of the transistor is many times larger than that of the base. For example, the amplification factor of the triode is 100 times, the current required for switching is 3000mA, and then the current flowing through the reed switch is less than 30 mA. So that a common reed switch can be used. The reed switch can also be small in size, and a small magnet can also be used as the magnet.

The normally closed switch may be replaced by a normally open switch depending on the application.

Example 2: current amplifying circuit based on NPN triode

As shown in fig. 3, a current amplifying circuit includes 2 load driving branches connected in inverse parallel; the power supply supplies power to the load through the 2 load driving branches which are reversely connected in parallel;

each load driving branch comprises a current amplification module, namely a module 1 and a module 2, and the current amplification modules in the 2 load driving branches are connected in opposite directions;

the current amplification module is the reed switch-based current amplification module in embodiment 1.

The load is a direct current brush motor.

Each load driving branch is provided with a protection diode, namely D3 and D4, and the cathode of the protection diode is connected with the input end M of the current amplification module or the anode of the protection diode is connected with the output end N of the current amplification module.

The current amplification circuit is a typical application of the current amplification module in embodiment 1, and is implemented by using a general switch which has a short service life and is generally implemented by using a waterproof switch such as a reed switch when waterproof is required. The reed switch in this application is a passive device. After the circuit is used, the current can be amplified under the condition of no increasing of the wiring harness.

In this embodiment, common mechanical structure is including 2 current amplification modules, module 1 and module 2 promptly, and module 1, module 2 are fixed in the both sides position that opens the door and close the door, and magnet is fixed on the door, and then the door motion, and magnet has been close to module 1 when the door moves to the extreme position that opens the door, and the reed switch normal close point disconnection this moment, the triode also stops working, and the motor stops working promptly. When the control circuit reverses the output current, the door starts to move towards the door closing direction, when the door moves to the door closing limit position, the magnet is close to the module 2, the module 2 cuts off the current, and the motor stops running.

Example 3: current amplification module based on PNP type triode

A current amplification module based on a reed switch comprises a normally closed switch S and a triode Q of the reed switch; the triode is a PNP type triode;

the E pole of the triode is used as the input end M of the current amplification module, and the C pole of the triode is used as the output end N of the current amplification module;

The current amplification module based on the reed switch further comprises a fly-wheel diode D, and the cathode and the anode of the fly-wheel diode are respectively connected with the input end M and the output end N of the current amplification module.

Example 4: current amplifying circuit based on NPN triode

the current amplification module is a current amplification module based on a reed switch and a PNP triode in embodiment 3.

The load is a direct current brush motor.

Claims

1. A current amplification module based on a reed switch is characterized by comprising a switch (S) and a triode (Q) of the reed switch; the triode is an NPN type triode or a PNP type triode; the switch is a normally open switch or a normally closed switch, and the switch is bridged between the C pole and the B pole of the triode;

for the case where the transistor is an NPN transistor:

the C pole of the triode is used as the input end (M) of the current amplification module, and the E pole of the triode is used as the output end (N) of the current amplification module;

for the case where the transistor is a PNP transistor:

the E pole of the triode is used as the input end (M) of the current amplification module, and the C pole of the triode is used as the output end (N) of the current amplification module.

2. The reed switch-based current amplification module as claimed in claim 1, further comprising a first diode (D) having a cathode and an anode connected to the input terminal (M) and the output terminal (N) of the current amplification module, respectively.

3. A current amplifying circuit is characterized by comprising 2 load driving branches which are connected in parallel in an opposite direction; the power supply supplies power to the load through the 2 load driving branches which are reversely connected in parallel;

the current amplification module is the reed switch-based current amplification module in claim 1 or 2.

4. The current amplifying circuit according to claim 3, wherein the load is a DC brush motor.

5. A current amplifying circuit according to claim 3, wherein each load driving branch comprises a second diode, the cathode of the second diode being connected to the input terminal (M) of the current amplifying module, or the anode of the second diode being connected to the output terminal (N) of the current amplifying module.