General NMOS (N-metal-oxide-semiconductor) switching tube driver circuit
A technology for driving circuits and switching tubes, which is applied in the direction of electronic switches, circuit devices, battery circuit devices, etc., and can solve the problems that ordinary discrete component drive circuits cannot normally control the discharge of NMOS tube Q2, etc., so as to ensure safety, increase reliability, and avoid The effect of misuse
Inactive Publication Date: 2015-04-15
LUOYANG INST OF SCI & TECH
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Problems solved by technology
[0006] Since the potential of P- is lower than that of B- during the charging process, and the ground GND of the control system is based on the potential of the negative electrode B- of the energy storage device, the ordinary discrete component drive circuit cannot normally control the discharge of the NMOS transistor Q2. on and off
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[0017] Such as image 3 As shown, a general-purpose NMOS switch tube drive circuit includes a control device, which is connected to a discharge control circuit and a charge control circuit.
[0018] The charging control circuit includes a triode Q6, a capacitor C2 is connected between the collector and the emitter of the triode Q6, the base of the triode Q6 is connected to the resistor R8, the collector is connected to R7, and the collector of the triode Q6 is connected to the base of the triode Q7. The emitter of the transistor Q6 is connected to the emitter of the transistor Q7, the collector of the transistor Q7 is connected to the first voltage stabilizing circuit, the first voltage stabilizing circuit is connected to the gate of the PMOS transistor Q8, and the drain of the PMOS transistor Q8 is connected to the second The voltage regulator circuit is connected.
[0019] The discharge control circuit includes a triode Q3, a capacitor C1 is connected between the collector and ...
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The invention discloses a general NMOS (N-metal-oxide-semiconductor) switching tube driver circuit. The driver circuit comprises a control device, wherein the control device is connected with a discharge control circuit and a charge control circuit. The driver circuit has the following beneficial effects that the driver circuit is formed by relatively cheap discrete components and has the characteristics of low cost and low power consumption compared with the existing driver circuits; besides, control of charge and discharge is realized via a pair of different control signals; the control reliability and system safety are improved by way of circuit redundancy; at the moment the control system is powered on or powered off and under the condition that the controller is abnormal, the charge / discharge loop is firstly cut off, thus avoiding false operation and ensuring system safety; and the problem that the charge loop can not be reliably connected or cut off and the oscillatory condition is formed because the driver circuit formed by the common triode or MOS tube can not provide the potential equivalent to the cathode P- of a charger is also solved.
Description
Technical field [0001] The invention relates to an NMOS switch tube driving circuit, in particular to an NMOS switch tube driving circuit composed of discrete components. Background technique [0002] At present, the widely used drive technologies mainly include dedicated drive chip drive and optocoupler drive. The use of dedicated NMOS drive chip is expensive, and the cost is unbearable in low-end and mid-range products. If the photocoupler drive adopts ordinary optocoupler, its drive current It needs to reach more than 10MA to drive reliably, and the power consumption is too large for the charge and discharge switch circuit that needs to work for a long time. If a photocoupler that can be driven by a small current is used, there is also the problem of excessive price. [0003] The charge and discharge system using NMOS tube for switch control has two structures: charging and discharging with the same port and charging and discharging with different ports. The circuit schematic di...
Claims
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IPC IPC(8): H03K17/687H02J7/00
Inventor 董红政张波张伟民郭超姚雷博段晓明郑玉丽
Owner LUOYANG INST OF SCI & TECH