The simple principle is as shown in the figure below. When the transistor is turned on, the collector output is low; when the transistor is turned off, the collector output is suspended, so the circuit needs external load resistance and power supply during operation. As long as the resistance value of the resistor and the value of the power supply voltage are properly selected, it is possible to ensure that the high and low levels of the output meet the requirements, and the load current of the output transistor is not too large. Schematic diagram of open collector output The open collector output is an output circuit in which the emitter of the transistor of the output circuit is used as a common terminal and the collector is suspended. It is generally divided into an NPN open collector output (see Figure 1) and a PNP open collector output (see Figure 2). 1, NPN type triode It consists of three semiconductors, two of which are N-type and one P-type semiconductor, the P-type semiconductor is in the middle, and two N-type semiconductors are on both sides. Transistors are the most important devices in electronic circuits, and their main functions are current amplification and switching. NPN is the current (IC) of C→E controlled by the current (IB) of B→E. The E potential is the lowest, and the normal C potential is the highest when it is normally amplified, that is, VC “VB†VE. 2, PNP type triode A transistor composed of one N-type semiconductor sandwiched between two P-type semiconductors is called a PNP-type triode. It can also be described as a transistor in which current flows from the emitter E. PNP is to control the current (IC) of E→C with the current (IB) of E→B. The E potential is the highest, and the C potential is the lowest when normal amplification, that is, VC “VB†VE. 1. The voltage output is based on the open-collector output circuit. A pull-up resistor is connected between the power supply and the collector to make a stable voltage between the collector and the power supply. See Figure 3. 2. The complementary output is an output circuit with two output transistors of NPN and PNP on the output. According to the [H] and [L] of the output signal, the two output transistors alternately perform [ON] and [OFF] operations, which can be slightly longer than the open collector output circuit, and can also be connected to the open collector input device (NPN). , PNP) connection. The output circuit is shown in Figure 4. 3. The linear drive output adopts the RS-422 standard, and the AM26LS31 chip is applied to the output mode of high-speed and long-distance data transmission. The signal is output in differential form, so the anti-interference ability is stronger. The output signal needs to be received by a device that is specifically capable of receiving a linear drive output. The output circuit is shown in Figure 5. KNL4-100 Residual Current Circuit Breaker
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What is the meaning of open collector output?
First, the principle of open collector output