Normally-on solid-state power controller based on enhanced MOSFET

Abstract

A normally-on solid state power controller based on an enhanced MOSFET comprises a processor MCU, a power supply circuit, a communication circuit, a control circuit, a driving protection circuit, an electrical parameter acquisition circuit and a power circuit, and the power supply circuit is connected to the processor MCU, the control circuit and the driving protection circuit and used for providing a working power supply; the communication circuit, the control circuit and the electrical parameter acquisition circuit are all connected to the processor MCU, the driving protection circuit is connected with the control circuit, the control circuit is connected with the power circuit, and the driving protection circuit is used for receiving a control signal of the control circuit and controlling the power circuit; the electric parameter acquisition circuit acquires current and voltage values of the power circuit and inputs the current and voltage values to the processor MCU, and the communication circuit is used for receiving an external control instruction to the processor MCU and uploading acquisition information of the electric parameter acquisition circuit. According to the utility model, the solid-state power controller can be normally switched on by default when the processor fails, and the requirement of a power distribution system for the power distribution output reliability of key and important loads is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrical control technical field, especially, relate to a kind of always-on solid-state power controller based on enhanced MOSFET. BACKGROUND

[0002] Traditional power controller usually adopts mechanical or electromagnetic switch, but these switches have mechanical wear, arc generation and slow response speed and other problems.Solid-state power controller realizes the accurate control of power by using solid-state electronic devices (such as transistor, diode etc.), thereby effectively avoiding these problems.Solid-state power controller is widely used in aviation, tank, ship and other fields due to its small size, light weight, high reliability and no arc phenomenon when turning on / off.

[0003] The key point of solid-state power controller for power distribution of electrical equipment is that it can not only respond to host computer instruction through bus, but also realize the on-off of rear-end load through discrete quantity, and it can be reset on through reset instruction after completing trip protection.However, some key important loads that affect safety need to ensure continuous power supply, and in existing solid-state power distribution technology, the solid-state power controller used is always-off type, and this power distribution method cannot be turned on after processor failure or software failure. SUMMARY

[0004] The utility model aims at providing a kind of always-on solid-state power controller based on enhanced MOSFET to solve the above problems.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An always-on solid-state power controller based on enhanced MOSFET, comprising a processor MCU, a power supply circuit, a communication circuit, a control circuit, a drive protection circuit, an electrical parameter acquisition circuit and a power circuit, the power supply circuit is connected to the processor MCU, the control circuit and the drive protection circuit respectively, for providing working power supply;The communication circuit, the control circuit and the electrical parameter acquisition circuit are all connected to the processor MCU, the drive protection circuit is connected to the control circuit, the control circuit is connected to the power circuit, the drive protection circuit is used to receive the control signal of the control circuit, and the power circuit is controlled;The current and voltage values of the power circuit are input to the processor MCU by the electrical parameter acquisition circuit, and the communication circuit is used to receive external control instruction to the processor MCU and upload the acquisition information of the electrical parameter acquisition circuit.

[0007] Further, the power circuit uses enhanced MOSFET as the actuator, the gate of the enhanced MOSFET is connected to the drive protection circuit, the drain is connected to the power supply input, and the source is connected to the output end.

[0008] Further, the output end of the enhanced MOSFET is sequentially connected with a sampling resistor and a freewheeling diode.

[0009] Further, the sampling resistor is connected to the driving protection circuit and the electric parameter acquisition circuit respectively.

[0010] Further, the freewheeling diode is connected to the power supply ground.

[0011] Further, the control circuit comprises an optocoupler U1, a resistor R2 and a resistor R1, one end of the resistor R2 is connected to the positive pole of the optocoupler U1, and one end of the resistor R1 is connected to the output end of the optocoupler U1.

[0012] Further, the processor MCU has two output signals, which are MCU_KZ1 signal and MCU_KZ2 signal respectively, the other end of the resistor R2 is connected to the MCU_KZ1 signal, the other end of the resistor R1 is connected to the power supply, and the negative pole of the optocoupler U1 is connected to the MCU_KZ2 signal.

[0013] Further, the two control signals are only when the MCU_KZ1 is a high level signal and the MCU_KZ2 is a low level signal, the optocoupler U1 is turned on, and when the two control signals are in other states, the optocoupler U1 is not turned on.

[0014] Further, the processor MCU is built-in with an ADC acquisition, and the electric parameter acquisition circuit acquires the current value on the power circuit and sends it into the built-in ADC acquisition of the processor.

[0015] Further, the power supply circuit outputs 12V and 3.3V isolated power supply.

[0016] Compared with the prior art, the solid-state power controller has the following technical effects:

[0017] The solid-state power controller optimizes the control circuit on the basis of the original solid-state power controller, so that the solid-state power controller can keep on constantly after working without software, and the problem that the existing solid-state power controller cannot be connected after processor failure or software failure is solved, and simple logic devices are used in the technical implementation mode, so that not only good economic efficiency is obtained, but also good practicality is obtained.

[0018] The control circuit is optimized, the control circuit output signal is defaulted as the MOS tube on control signal (12V), only when the MCU_KZ1 is a high level signal and the MCU_KZ2 is a low level signal, the control circuit outputs the MOS tube off control signal (12V ground), so that the problem that the solid-state power controller cannot be connected when the processor fails or the software fails is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a circuit structure schematic view of the solid-state power controller.

[0020] Figure 2 For Figure 1 The control circuit schematic diagram. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] In embodiment 1, the utility model provides a kind of always-on solid-state power controller based on enhanced MOSFET, it is characterized in that, including processor MCU, power supply circuit, communication circuit, control circuit, drive protection circuit, electric parameter acquisition circuit and power circuit, power supply circuit is connected to processor MCU, control circuit and drive protection circuit respectively, for providing working power supply;Communication circuit, control circuit and electric parameter acquisition circuit are all connected to processor MCU, drive protection circuit connects control circuit, control circuit connects power circuit, drive protection circuit is used to receive the control signal of control circuit, controls power circuit;The current, voltage value of electric parameter acquisition circuit acquisition power circuit is input to processor MCU, communication circuit is used to receive external control instruction to processor MCU, and upload the acquisition information of electric parameter acquisition circuit.

[0023] Power circuit uses enhanced MOSFET as executor, and the gate of enhanced MOSFET is connected to drive protection circuit, the drain is connected to power supply input, and the source is connected to output end.

[0024] The output end of enhanced MOSFET is sequentially connected with sampling resistor and freewheeling diode.

[0025] Processor MCU has two-way output signal, and is MCU_KZ1 signal and MCU_KZ2 signal respectively, the other end of resistance R2 is connected MCU_KZ1 signal, the other end of resistance R1 is connected power supply, and the negative pole of photoelectric coupler U1 is connected MCU_KZ2 signal.

[0026] Two-way control signal is only when MCU_KZ1 is high level signal, MCU_KZ2 is low level signal, photoelectric coupler U1 is turned on, and two-way control signal is other state, photoelectric coupler U1 is not turned on.

[0027] The solid-state power controller optimizes the control circuit on the basis of the original solid-state power controller, so that the solid-state power controller can keep on constantly after working without software, and solves the problem that the existing solid-state power controller cannot be turned on after processor failure or software failure, and the technical implementation mode uses simple logic devices, which has good economy and good practicability.

[0028] In the embodiment 2, the utility model discloses a constant-on solid-state power controller based on enhanced MOSFET, comprising: a processor, a power supply circuit, a communication circuit, a control circuit, a drive protection circuit, an electric parameter acquisition circuit and a power circuit. The power supply circuit is connected to the processor MCU, the control circuit and the drive protection circuit respectively and is used for providing working power supply;The communication circuit, the control circuit and the electric parameter acquisition circuit are all connected to the processor MCU, the drive protection circuit is connected to the control circuit, the control circuit is connected to the power circuit, and the drive protection circuit is used for receiving the control signal of the control circuit and controlling the power circuit. The electric parameter acquisition circuit acquires the current and voltage values of the power circuit and inputs the current and voltage values into the processor MCU, and the communication circuit is used for receiving external control instructions into the processor MCU and uploading the acquisition information of the electric parameter acquisition circuit.

[0029] The processor completes the command receiving, logic control and state acquisition of the solid-state power controller.

[0030] The power supply circuit converts the 5V power supply into 12V and 3.3V isolated power supply working power supply.

[0031] The communication circuit is responsible for receiving control instructions and uploading the self-checking state and electric parameter information of the solid-state power controller.

[0032] The control circuit outputs the on control signal by default, and outputs the off control signal only when the processor controls off.

[0033] The drive protection circuit receives the control signal of the drive circuit, controls the on-off of the MOSFET, and performs short-circuit protection.

[0034] The electric parameter acquisition circuit acquires the current and voltage values of the power circuit and inputs the current and voltage values into the built-in ADC acquisition of the processor. 2 When the power circuit appears overcurrent fault, the processor controls off according to the calculation result of the inverse time limit characteristic curve formula, realizes overcurrent tripping protection;When the line occurs short-circuit fault or the current is greater than the set multiple of the rated current, the processor controls the MOSFET to be off immediately without delay, realizes software short-circuit fast protection, and the processor detects the hardware tripping state through I / O, and the hardware short-circuit tripping is realized by independent hardware circuit and is not affected by software

[0035] The power circuit selects the enhanced MOSFET as the power execution device.

[0036] The control circuit R2 is connected with the MCU_KZ1 signal at one end, the other end of the resistor R2 is connected with the input positive end of the optocoupler U1, the input negative end is connected with the MCU_KZ2 signal, the driving circuit R1 is connected with the 12V driving power supply at one end, the output collector C of the optocoupler U1 is connected with the other end of the R1, and the emitter E is connected with the signal ground.

[0037] The processor outputs two control signals MCU_KZ1 and MCU_KZ2 to the control circuit, and the two control signals are only high-level signals and low-level signals, the optocoupler U1 is turned on, the control circuit outputs the MOS tube opening control signal to the driving protection circuit, and the driving protection circuit controls the MOSFET to be turned off. When the two control signals are in other states, the optocoupler cannot be turned on, the optocoupler control circuit outputs the MOS tube closing control signal to the driving protection circuit, and the driving protection circuit controls the MOSFET to be turned on.

[0038] When the two control signals are in other states or the processor fails or the software fails, the optocoupler cannot be turned on, the optocoupler control circuit outputs the MOS tube closing control signal to the driving protection circuit, and the driving protection circuit controls the MOSFET to be turned on.

[0039] The current value on the power circuit is collected by the electric parameter collection circuit and sent to the built-in ADC of the processor. When the power circuit has an overcurrent fault, the processor controls the MOSFET to be turned off according to the calculation result of the t inverse time limit characteristic curve formula, so that the overcurrent tripping protection is realized; when the line has a short-circuit fault or the current is greater than the set multiple of the rated current, the processor controls the MOSFET to be turned off immediately without delay, so that the software short-circuit fast protection is realized, the processor detects the hardware tripping state through the I / O, and the hardware short-circuit tripping is realized by the independent hardware circuit and is not affected by the software. 2 t inverse time limit characteristic curve formula, so that the overcurrent tripping protection is realized; when the line has a short-circuit fault or the current is greater than the set multiple of the rated current, the processor controls the MOSFET to be turned off immediately without delay, so that the software short-circuit fast protection is realized, the processor detects the hardware tripping state through the I / O, and the hardware short-circuit tripping is realized by the independent hardware circuit and is not affected by the software.

[0040] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. An enhancement mode MOSFET based normally on solid state power controller, characterized in that, The power circuit adopts an enhanced MOSFET as an execution device, the gate of the enhanced MOSFET is connected to the drive protection circuit, the drain is connected to the power supply input, and the source is connected to the output end.

2. A normally on solid state power controller based on an enhanced MOSFET according to claim 1, wherein, The output end of the enhanced MOSFET is sequentially connected with a sampling resistor and a freewheeling diode.

3. A normally on solid state power controller based on an enhanced MOSFET according to claim 2, wherein, The sampling resistor is connected to the drive protection circuit and the electrical parameter acquisition circuit.

4. A normally-on solid state power controller based on an enhanced MOSFET according to claim 3, wherein, The freewheeling diode is connected to the power supply ground.

5. An always-on solid state power controller based on an enhanced MOSFET according to claim 3, wherein, The control circuit includes an optocoupler U1, a resistor R2 and a resistor R1, one end of the resistor R2 is connected to the positive electrode of the optocoupler U1, and one end of the resistor R1 is connected to the output end of the optocoupler U1.

6. An always-on solid state power controller based on an enhanced MOSFET according to claim 1, wherein, The processor MCU has two output signals, MCU_KZ1 signal and MCU_KZ2 signal, the other end of the resistor R2 is connected to the MCU_KZ1 signal, the other end of the resistor R1 is connected to the power supply, and the negative electrode of the optocoupler U1 is connected to the MCU_KZ2 signal.

7. A normally-on solid state power controller based on an enhanced MOSFET according to claim 6, wherein, The two control signals are only on when the MCU_KZ1 is a high-level signal and the MCU_KZ2 is a low-level signal, and the optocoupler U1 is not on when the two control signals are in other states.

8. The normally-on solid state power controller based on an enhanced MOSFET of claim 6, wherein, The processor MCU is built-in with an ADC acquisition, the electrical parameter acquisition circuit acquires the current value on the power circuit and sends it into the built-in ADC acquisition of the processor.

9. An always-on solid state power controller based on an enhanced MOSFET according to claim 1, wherein, The power circuit outputs 12V and 3.3V isolated power supply.

10. An always-on solid state power controller based on an enhanced MOSFET according to claim 1, wherein, ​

Images