CN201004193Y - P channel high power constant current two-terminal module - Google Patents

Abstract

The utility model discloses a P-channel high-power constant current two-terminal module, which includes a collector and an emitter of an NPN triode (1), and is characterized in that: the collector of the NPN triode (1) is connected to a P-channel field effect tube The drain and gate of (2), and the base of the NPN triode (1) are connected to the source of the P channel field effect transistor (2). The utility model uses a P-channel field effect transistor as a small current constant current source, which is proportionally amplified by an NPN triode (bipolar transistor) to become a large constant current. Compared with the existing integrated circuit and electronic module (component) technology, the utility model has the advantages of simple structure, and can directly drive the load with a constant current by using the current expansion method, and can be used as an existing diode or as a constant current power supply drive the load directly.

Description

P channel high power constant current two-terminal module

technical field

The utility model relates to a P-channel high-power constant-current two-terminal module realizing constant-current characteristics, which belongs to the technical field of circuit modules.

Background technique

A constant current diode is a semiconductor device that realizes a constant current source. At present, the international and domestic constant current diodes are usually products with low current and low power (output current: 0.5mA-10mA;), which are mainly used for setting the reference current in electronic circuits. Because the current and power are too small, it cannot directly drive the load. An electronic module or an integrated circuit with a power amplification function needs to be used to drive the load. These electronic modules or integrated circuits have many electronic components, are complex in design, cumbersome to use, and increase the production cost.

Contents of the invention

The purpose of the utility model is to provide a P-channel high-power constant current two-terminal module with simple design and can directly drive loads, so as to overcome the shortcomings of the prior art.

The utility model is constituted like this: it comprises NPN triode (1) and P channel field effect transistor (2), and the collector electrode of NPN triode (1) connects the drain and grid of P channel field effect transistor (2), NPN The base of the triode (1) is connected to the source of the P-channel field effect transistor (2).

An NPN transistor (3) can also be connected between the collector and the emitter of the NPN transistor (1), that is, the collector of the NPN transistor (1) is connected to the collector of the NPN transistor (3), and the NPN transistor (1) The emitter is connected to the base of the NPN transistor (3).

Both the NPN triode (1) and the NPN triode (3) are bipolar transistors.

The utility model uses the P-channel FET as a small current constant current source to provide a constant base current to the NPN triode (bipolar transistor) responsible for current expansion, which is proportionally (linearly) amplified by the NPN triode (bipolar transistor) (Extended) becomes a large constant current. Compared with the existing integrated circuit and electronic module (component) technology, the utility model has the advantages of simple structure, and can directly drive the load with a constant current by using the current expansion method, and can be used as an existing diode or as a constant current power supply drive the load directly.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model embodiment 1;

Accompanying drawing 2 is the structural representation of the utility model embodiment 2;

Accompanying drawing 3 is the circuit characteristic diagram of the relationship between the operating voltage V _D and the output current _ID of the utility model.

Detailed ways

Embodiment 1 of the present utility model: as shown in Figure 1, the collector electrode of NPN triode (1) is connected the drain and grid of P channel field effect transistor (2), and the base of NPN transistor (1) is connected P The source of the channel field effect transistor (2) and the NPN triode (1) adopt bipolar transistors. The collector and emitter of the NPN transistor (1) are used as the input and output terminals of the two-terminal module, and the output current I _D can reach the output constant current of the 20mA-300mA series, and the relationship between the working voltage V _D and the output current I _D is The circuit characteristic is shown in Fig. 3.

Embodiment 2 of the present utility model: as shown in Figure 2, the collector electrode of NPN triode (1) is connected the drain and grid of P channel field effect transistor (2), and the base of NPN transistor (1) is connected P The source of the trench field effect transistor (2), the collector of the NPN transistor (1) is connected to the collector of the NPN transistor (3), and the emitter of the NPN transistor (1) is connected to the base of the NPN transistor (3); the NPN transistor ( 1) The NPN triode (3) constitutes a composite triode to further expand the current. The NPN triode (1) and the NPN triode (3) adopt bipolar transistors. The collector of the NPN transistor (1) and the emitter of the NPN transistor (3) are used as the input and output terminals of the two-terminal module. The output current _ID can reach the output constant current of the 300mA-1A series, and its working voltage V _D and output current I The circuit characteristics of the relationship between _D are shown in Figure 3.

Claims (3)

1. A P channel high-power constant current two-terminal module, which includes an NPN transistor (1) and a P channel field effect transistor (2), is characterized in that: the collector of the NPN transistor (1) is connected to the P channel field effect transistor The drain and grid of (2), the base of the NPN triode (1) are connected to the source of the P channel field effect transistor (2). 2. The P channel high-power constant current two-terminal module as claimed in claim 1, is characterized in that: an NPN transistor (3) is also connected between the collector and the emitter of the NPN transistor (1), i.e. NPN The collector of the transistor (1) is connected to the collector of the NPN transistor (3), and the emitter of the NPN transistor (1) is connected to the base of the NPN transistor (3). 3. The P-channel high-power constant current two-terminal module according to claim 2, characterized in that: the NPN triode (1) and the NPN triode (3) are both bipolar transistors.

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