Común potencia fuente tipos y CC voltaje niveles en electrónica control sistemas
Con el creciente seguridad requisitos de el control bucle in el electrónico control sistema, el trabajo voltaje de el control bucle es convirtiéndose más y más bajo-voltaje DC. As a result, there are more and more electrical devices such as sensors using DC power supply, small, medium and micro DC relays in the control circuit. Because of this, there are correspondingly more switching power supplies of different brands in the electrónico control sistema. Porque it implica la normal operación de el todo o más de el control bucles, it es muy necesario para nosotros a entender algunos conocimientos de conmutación potencia consumibles.
First of all, let's take a look at the common types of switching power supplies in electronic control systems.
De acuerdo a el diferente correspondiente relación entre el secundario bobinado de el conmutador potencia suministro y el primario bobinado, el conmutar potencia suministro puede ser aproximadamente dividido en dos categorías: flyback tipo y autoexcitado tipo. Porque el flyback conmutación potencia alimentación tiene las ventajas de relativamente fijo circuito estructura, bueno estabilidad y fiabilidad, y bajo precio, it es más común en corriente electrónica control sistemas (suplemento: el integrado conmutación potencia alimentación módulo usado en algunos electrónicos control sistemas has bastante parte de it is also a flyback switching power supply circuito. El imagen muestra dos comunes flyback switching power supplies).
Sin embargo, due to the limit of the working principle of the flyback switching power supply, its output capacity is mostly between tens of VA and hundreds of VA, and there are muy few products exceeding 1 kVA in practice. Interested peers can take a look at the switching power supply in the surrounding environment. If you find that the integrated circuit model it uses is UC3842/43/44/45, it is a típico forma de flyback conmutación potencia alimentación. narración).
Next, let's look at matters related to the input and output voltages of switching power supplies. Because some switching power supply manufacturers not only face the domestic market, but also take into account the European, American and Japanese markets, so one switching power supply has two input voltage levels of AC110V and AC220V at the same time. Este tipo de conmutación potencia fuente es mayormente usado para seleccionar una selección interruptor en el circuito placa a completo el voltaje nivel selección. Porque de esto , nosotros debemos verificar si el entrada voltaje de entrada conmutación potencia suministro coincide con el real entrada voltaje antes instalación y uso , de lo contrario es muy fácil causar daño a el conmutador potencia fuente!
Next, let's take a look at the DC voltage levels that are often used in actual work. Combined with the actual situation, we often come into contact with the following four DC voltage levels in our work:
1. plus 5V: This voltage is usually suministred to the control board containing the single-chip microcomputer in the electronic control system, and some LED indicators;
2. plus 12V: This voltage is widely used in industrial control systems, and its power supply range covers proximity switches, infrared sensors, solid state relays, small electromagnetic relays, etc.;
3. plus 15V: This voltage is usually used by various testing instruments, but it is not very common in practice;
4. plus 24V: The voltage level of this circuit is the same as plus 12V, and it is also very commonly used in electronic control systems. In addition to the various loads transported by plus 12V, the plus 24V power supply is also responsible for the power supply of various touch screens, text editors, touch industrial control all-in-one machines and other devices.
Bajo circunstancias normales 2c conmutación potencia fuentes con dos salida voltaje niveles más 12V y más 24V son mayormente utilizados en electrónica control sistemas. Sin embargo, it needs to be pointed out that in the actual use of the control process, often due to to different control objects, in order to prevent unfavorable factors such as interference, the "GND/COM" terminals between different voltage levels of the output terminal of the switching power supply are also divided into common and independent. Two types of formulas. When el el use, we should choose to use in A dirigido manera en luz de la situación actual.
Finalmente, let me talk about a matter that needs special attention in the actual use of switching power supplies. When driving electromagnetic relays and other inductive loads that will generate extremely high back electromotive force (equivalent to) at the moment of turning off, we need to use this the two ends of the coil of this type of device are reversed and a diode (usually the model is 1N4007) is used to discharge el reverso electromotor fuerza. Este diodo es llamado a libremente diodo. Entonces evitar dañar a el conmutación potencia alimentación!
