Overcurrent protection circuit, overcurrent protector, and overcurrent protection circuit forming method

Abstract

The embodiment of the invention discloses an overcurrent protection circuit, an overcurrent protector and an overcurrent protection circuit forming method. The overcurrent protection circuit comprises a conductive line formed on a DBC substrate and a current sampling resistor R1 formed by a predetermined-size copper strip cut from the DBC substrate. The overcurrent protector includes the overcurrent protection circuit, an overcurrent signal processing circuit and a driving circuit. The overcurrent protection circuit forming method comprises the following steps of: S1, forming the conductive line and the current sampling resistor R1 on the DBC substrate; and S2, soldering circuit components other than the current sampling resistor R1 onto a preset position of the DBC substrate to communicate with the conductive line. The overcurrent protection circuit uses the predetermined-size copper strip cut from the DBC substrate as the current sampling resistor R1 to sample a current signal, is stable in current-converted voltage, large in overcurrent, and high in circuit reliability, reduces the number of resistors, and decreases production cost.

Description

technical field [0001] The invention relates to the technical field of overcurrent protection circuits, in particular to an overcurrent protection circuit, an overcurrent protector and a forming method for the overcurrent protection circuit. Background technique [0002] With the development of motor technology and motor drivers, more and more motor drivers begin to require overcurrent protection functions. Generally, motor drivers usually use operational amplifiers, comparators or dedicated overcurrent protection ICs as overcurrent protection circuits. In the market, there are already products in which the overcurrent protection circuit is welded on the DBC substrate. The DBC substrate is a copper-clad ceramic substrate with a ceramic insulator as the base plate and a layer of metallic copper on the base plate. However, the existing process The flow protection circuit is complex and has many components, and all the components need to be welded. The welding and forming of th...

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Problems solved by technology

[0002] With the development of motor technology and motor drivers, more and more motor drivers begin to require overcurrent protection functions. Generally, motor drivers usually use operational amplifiers, comparators or dedicated overcurrent protection ICs as overcurrent protection circuits. In the market, there are already products in which the overcurrent protection circuit is welded on the DBC substrate. The DBC substrate is a copper-clad ceramic substrate with a ceramic insulator as the base plate and a layer of metallic copper on the base plate. However, the existing process Current protection circuit circuit is complex, there are many components and all components need to be welded, the difficulty of circuit welding and forming is high, and the production cost is high

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