CN204046557U - A kind of high efficiency intelligence flash electronic load switch of voltage adaptability - Google Patents
A kind of high efficiency intelligence flash electronic load switch of voltage adaptability Download PDFInfo
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Abstract
A high efficiency intelligence flash electronic load switch for voltage adaptability, comprises supply module, kernel control module, Bootstrap module, voltage detection module, current detection module and switch module; Kernel control module is used for signals collecting, information processing, storage and logic control: one is the detection signal accepting the output of external switch control inputs signal, current detection module and voltage detection module, and press internally stored program Treatment Analysis monitor data, control switch module completes corresponding actions, and two is for Bootstrap module provides pwm control signal; Voltage, current detection module are used for real-time working voltage, the electric current of sense switch module, and data are passed to kernel control module Treatment Analysis; Bootstrap module is used for providing driving voltage for the switching tube in switch module; Switch module is for performing the on-off action of load.This load switch operating voltage range and operating frequency high, efficiency is high, and loss is low, safe and reliable, programmable.
Description
Technical field
The utility model relates to a kind of electronic load switch, particularly relates to a kind of high efficiency intelligence flash electronic load switch of voltage adaptability.
Background technology
Compare mechanical switch, the electronic load switch using semiconductor technology to realize break-make has that volume is little, loss is low, quick action, break-make are reliable, useful life is long, can realize the advantages such as PWM output, be that all kinds of DC electric apparatus drives, PWM controls indispensable module, apply very extensive.
Although electronic load switch has a lot of advantage in application, but its critical piece switching tube requires very high to drive condition, especially responsive especially to operating voltage, under different operating voltages, the performance of switching tube can vary widely, and causes hydraulic performance decline even cannot normally work or heating burnout; In order to tackle this problem, general electronic load switch product all can make considered critical to its operating voltage range, and the product of different operating voltage section does not allow general; Along with the development of electronic and electrical equipment; functionally can only be difficult to the demand meeting high reliability product by the simple passive controlled electronic load switch opening shutoff, the electronic load switch with intelligent functions such as autonomous monitoring and payload security protections is directions of future development.
Load switch can be divided into flash and two kinds, low limit by switch present position, and flash refers to that switch is between positive source and load positive pole; Low limit refers to that switch is between load negative pole and power cathode, from load break-make performance, high side switches is all better than lower edge switch in fail safe and durability, because high side switches shutoff back loading side is not charged, the measure of various protection switch pipe is also easy to realize; But from design angle, under realizing the prerequisite of identical performance, just comparatively lower edge switch is more difficult for high side switches; Current market lower edge switch generally adopts N-channel MOS pipe as switching tube, and structure is simple, and switching speed and efficiency are all very high; High side switches generally adopts P channel MOS tube as switching tube more, though structure is simple, but owing to using P channel MOS tube, its switching speed and efficiency far short of what is expected compared with N-channel MOS pipe, generate heat larger, be difficult to be applicable to high-frequency or big current application scenario, use N-channel MOS pipe if change into, need again to solve the problem of switching tube driving voltage higher than load voltage.
Summary of the invention
The technical problems to be solved in the utility model is: for prior art Problems existing, there is provided a kind of N-channel MOS pipe that adopts as switching tube, there is the high efficiency intelligence flash electronic load switch of voltage adaptability, object is the voltage adaptation scope widening electronic load switch, improve the versatility of switch product under various operational environment, fail safe, operating frequency and switch efficiency, simultaneously for the intelligentized demand of switch, add multiple monitoring and protection function, realize the intelligent monitoring to load behavior and protection, to overcome the deficiency existing for above-mentioned prior art.
The technical scheme that the utility model is taked is: a kind of high efficiency intelligence flash electronic load switch of voltage adaptability, comprises supply module, kernel control module, Bootstrap module, voltage detection module, current detection module and switch module;
The input end interface of described kernel control module connects the input of external switch control inputs, voltage detection module and current detection module respectively, and its output interface connects Bootstrap module and switch module respectively; Described voltage detection module is connected with supply module respectively with the input of current detection module, and its output connects the input end interface of kernel control module; The input of described Bootstrap module is connected with the output interface of kernel control module, the output connecting valve module of Bootstrap module; Described supply module input is connected with external power source, and output connects described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module respectively; Described supply module is used for accepting the input of externally fed power supply, and provides corresponding power supply for described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module and detect access point.
Described kernel control module is used for signals collecting, information processing, storage and logic control: one is the detection signal accepting the output of external switch control inputs signal, current detection module and voltage detection module, and press internally stored program Treatment Analysis monitor data, control switch module completes corresponding actions, and two is for Bootstrap module provides pwm control signal; Described voltage detection module is used for the real-time working voltage of sense switch module, and detection data are passed to kernel control module Treatment Analysis; Described current detection module is used for the real-time working electric current of sense switch module, and detection data are passed to kernel control module Treatment Analysis; Described Bootstrap module for accepting the control of kernel control module, for the switching tube in switch module provides required driving voltage; Described switch module, for accepting the control of kernel control module, performs the on-off action of load.
Its further technical scheme is: described kernel control module comprises digital microcontroller module, internal electric source administration module, PWM module, I/O controller module, non-volatile memory module, ADC module and internal clocking module;
Described digital microcontroller module is the control centre of kernel control module, for performing various calculating or instruction; Described internal electric source administration module is described digital microcontroller module, non-volatile memory module, I/O controller module, ADC module, internal clocking module, PWM module provide suitable power supply management and control, one is the control for accepting digital microcontroller module, close or open the power supply of other modules except digital micro controller module, minimization system power consumption, two is for independently performing voltage detecting: when input voltage too low or unstable time send inform digital microprocessor module, make it take measures in time to avoid occurring control disorder; Internal electric source administration module uses No. 1 port as input negative pole, uses 2 ports as input positive pole; Described PWM module for the setting according to digital microcontroller, the stable pwm signal producing certain frequency and duty ratio, and passes through the work of No. 6 output port drived control Bootstrap modules; Described I/O controller module is for providing the service with exchanges data and port driver for kernel control module, and pass through the break-make of No. 5 output port control switch modules, the instruction of external switch control inputs is received by No. 7 input ports: or directly digital command signal is passed to digital microcontroller module analysis, or submit to digital microcontroller module analysis again after analog command signal being sent ADC resume module to change; Described non-volatile memory module for storing the configuration data of decision threshold variable, and under the control of digital microcontroller module internal data carry out writing, wipe, read operation; Described ADC module is analog-to-digital conversion module, for gathering sample amplitude when reproduced, sends digital microcontroller resume module to, to monitor and to judge that whether the voltage and current situation of load switch is normal after gained digital information being changed; ADC module uses No. 3 ports as current detecting input port, and No. 4 ports are as voltage detecting input port; Described internal clocking module is used for providing clock signal needed for work for digital microcontroller.
Its further technical scheme be: described supply module comprises voltage-stabiliser tube DZ1, diode D1, linear voltage regulator N2, resistance R1 and electric capacity C1; Described linear voltage regulator N2 is used for adjusting with the low-voltage DC of stable output for other low-voltage circuit modules input voltage; Described voltage-stabiliser tube DZ1, for absorbing the high-voltage pulse in DC power supply, avoids linear voltage regulator N2 breakdown, and described diode D1 is used for preventing electric current adverse current, prevents DC power supply input change in polarity from affecting linear voltage regulator N2; Described resistance R1 and electric capacity C1 forms low-pass filter circuit, and the high frequency ripple on filtering linear voltage regulator N2 input, to improve linear voltage regulator N2 output quality.
Described voltage detection module comprises resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, integrated transporting discharging N3A, integrated transporting discharging N3B and voltage-stabiliser tube DZ2; Described resistance R2 and resistance R3 forms the voltage sample value that bleeder circuit inputs to produce DC power supply, inputs to the integrated transporting discharging N3B adopting forward follower connection; Described integrated transporting discharging N3B is used for isolation, stablizes sampled signal; Described resistance R5, resistance R6, resistance R7 and integrated transporting discharging N3A form differential amplifier, process for carrying out adjustment to voltage sampling signal and export to kernel control module analysis; Described voltage-stabiliser tube DZ2 and resistance R4 is used for providing stable reference voltage for described differential amplifier.
Described current detection module comprises resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, integrated transporting discharging N3C and integrated transporting discharging N3D; Described resistance R8 is sampling resistor, flows to the total current of load for gathering DC power supply; Described resistance R9, resistance R10, resistance R11 and resistance R12 form dropping resistor network, jointly carry out adjustment to current sampling signal with the differential amplifier be made up of integrated transporting discharging N3C and resistance R13, resistance R14, resistance R15, resistance R16 to process, then flow to kernel control module analysis; Described integrated transporting discharging N3D and resistance R17, resistance R18 provide quiescent operation point voltage, to reduce its magnification distortion for differential amplifier.
Described Bootstrap module comprises resistance R19, resistance R20, resistance R21, resistance R22, electric capacity C3, diode D2, triode V1, triode V2, triode V3, triode V4 and voltage-stabiliser tube DZ3; Described R19 is current-limiting resistance, and its one end connects No. 6 output ports, i.e. the PWM module output port of kernel control module, the emitter of other end connecting triode V1 and triode V2; Described resistance R20 and resistance R21 forms bleeder circuit provides upset reference level for pwm signal, improves upset efficiency; Described electric capacity C3 is bootstrap capacitor, and resistance R22 is connected in series with electric capacity C3, for the current limliting that electric capacity C3 charges; Described diode D2 is for stoping electric capacity C3 electric current adverse current, limiting capacitance C3 output voltage peak value, protection switch module; Described triode V3 and triode V4, respectively by the driving of triode V1 and triode V2, realizes the isolation of high-low pressure and the break-make of low-voltage driving high pressure:
When PWM exports high level, triode V1 and triode V3 ends, triode V2 and triode V4 conducting, and DC power supply is charged to bootstrap capacitor C3 by D2 and R22, and electric capacity C3 rear maintenance both end voltage of having charged is identical with DC power supply;
After PWM output becomes low level, triode V1 and triode V3 conducting, triode V2 triode V4 ends, and DC power supply raises electric capacity C3 negative terminal voltage by force, electric capacity C3 positive pole is made to obtain 2 times to the electromotive force of direct current power source voltage, for the flash N-channel MOS pipe in driving switch module.
Described switch module comprises resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, diode D3, diode D4, diode D5, triode V5, triode V6, triode V7, triode V8, triode V9, N-channel MOS pipe V10 and adjustable resistor RP1; Described R23 is current-limiting resistance, and its one end connects No. 5 output ports of kernel control module, the emitter of other end connecting triode V5 and triode V6; Described resistance R24 and resistance R25 forms bleeder circuit provides upset reference level for the switch controlling signal that kernel control module exports, and improves upset efficiency; Described triode V7 and triode V8, respectively by the driving of triode V5 and triode V6, realizes the isolation of high-low pressure and the break-make of low-voltage driving high pressure:
When switch controlling signal is low level, triode V6 and triode V8 ends, triode V5 and triode V7 conducting, and the high voltage that Bootstrap module exports is added to the grid level of N-channel MOS pipe V10 by current-limiting resistance R26, make N-channel MOS pipe V10 conducting, start as load supplying; When switch controlling signal is high level, triode V6 and triode V8 conducting, triode V5 and triode V7 ends, and N-channel MOS pipe V10 grid drags down voltage by diode D3 repid discharge, and N-channel MOS pipe V10 ends rapidly, cuts off the power supply to load;
Described triode V9, resistance R27 and adjustable resistor RP1 form negative-feedback circuit, for regulating the size of N-channel MOS pipe V10 grid maximum input voltage, are not punctured to protect N-channel MOS pipe V10 grid by too high voltages; Described diode D4, resistance R28 and electric capacity C4 form RC pulse absorption circuit, open source electrode in turn off process and the instantaneous high pressure pulse between drain electrode for absorbing the N-channel MOS pipe V10 caused by load, and V10 is not breakdown for protection N-channel MOS pipe; It is in perceptual situation that described diode D5 is used for load, is oad freewheels at N-channel MOS pipe V10 shutdown moment, and V10 is not breakdown for protection N-channel MOS pipe.
Owing to adopting technique scheme, compared with prior art, the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability of the utility model has following beneficial effect:
1. owing to employing perfect low voltage control high-tension circuit, improve high-pressure side and can allow threshold voltage, make the high efficiency of a kind of voltage adaptability of the utility model intelligence flash electronic load switch have wider operating voltage range and very high operating frequency;
2. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability of the utility model adopts Bootstrap to drive the mode of flash N-channel MOS pipe to realize opening and shutoff of switch, and be aided with multiple auxiliary circuit, thus achieve the high efficiency of switch, high-frequency, low-loss;
3. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability of the utility model employs microcontroller and carries out Based Intelligent Control and monitoring, when monitoring voltage, the electric current noted abnormalities, load supplying can be automatically shut down, avoid occurring unsafe condition in no worker monitor situation, make switch itself and load be obtained for safer protection, there is higher fail safe;
4. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability of the utility model is programmable, and the function of this load switch and the scope of application are greatly expanded:
Under heavy duty applicable cases, power supply is impacted for causing sudden high currents when avoiding starting because of quick and complete conducting, use PWM gradual change duty ratio mode able to programme, control the output current effective value in start-up course, realize output current by little and large gentle transition, complete heavy duty soft start;
Controlled by the auto switching realizing complex condition able to programme, as the self-defined conducting again after time delay, timing break-make, trigger protection is attempted; Load consuming power can be regulated PWM mode, realize controlled or automatic bearing power and control.
Be further described below in conjunction with the technical characteristic of drawings and Examples to the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability of the utility model.
Accompanying drawing explanation
Fig. 1 is the high efficiency intelligence flash electronic load construction of switch block diagram of a kind of voltage adaptability of the utility model;
Fig. 2 is the high efficiency intelligence flash electronic load switching circuit figure of a kind of voltage adaptability of the utility model;
Fig. 3 is kernel control module structured flowchart;
Fig. 4 is Bootstrap module circuit diagram;
Fig. 5 is voltage detection module circuit diagram;
Fig. 6 is current detection module circuit diagram;
Fig. 7 is switch module circuit diagram;
Fig. 8 is supply module circuit diagram.
In figure: 00-supply module, 11-core controls mould, 110-digital microcontroller module, 111-internal electric source administration module, 112-PWM module, 113-I/O controller module, 114-non-volatile memory module, 115-ADC module, 116-internal clocking module, 12-Bootstrap module, 13-voltage detection module, 14-current detection module, 15-switch module.
Embodiment
Embodiment
A high efficiency intelligence flash electronic load switch for voltage adaptability, described intelligent flash electronic load switch comprises supply module 00, kernel control module 11, Bootstrap module 12, voltage detection module 13, current detection module 14 and switch module 15; The input end interface of described kernel control module 11 connects the input of external switch control inputs, voltage detection module and current detection module respectively, and its output interface connects Bootstrap module and switch module respectively; Described voltage detection module 13 is connected with supply module respectively with the input of current detection module 14, and its output connects the input end interface of kernel control module;
The input of described Bootstrap module 12 is connected with the output interface of kernel control module, the output connecting valve module of Bootstrap module; Described supply module 00 input is connected with external power source, and output connects described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module respectively; Described supply module is used for accepting the input of externally fed power supply, and provides corresponding power supply for described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module and detect access point.
Described kernel control module 11 is for signals collecting, information processing, storage and logic control: one is the detection signal accepting the output of external switch control inputs signal, current detection module and voltage detection module, and press internally stored program Treatment Analysis monitor data, control switch module completes corresponding actions, and two is for Bootstrap module provides pwm control signal; Detection data for the real-time working voltage of sense switch module, and are passed to kernel control module Treatment Analysis by described voltage detection module 13; Detection data for the real-time working electric current of sense switch module, and are passed to kernel control module Treatment Analysis by described current detection module 14; Described Bootstrap module 12 for accepting the control of kernel control module, for the switching tube in switch module provides required driving voltage; Described switch module 15, for accepting the control of kernel control module, performs the on-off action of load.
Described kernel control module 11 comprises digital microcontroller module 110, internal electric source administration module 111, PWM module 112, I/O controller module 113, non-volatile memory module 114, ADC module 115 and internal clocking module 116, described digital microcontroller module 110 is control centres of kernel control module, for performing various calculating or instruction, described internal electric source administration module 111 is the digital microcontroller module in kernel control module, non-volatile memory module, I/O controller module, ADC module, internal clocking module, PWM module provides suitable power supply management and control, one is the control for accepting digital microcontroller module, close or open the power supply of other modules except digital micro controller module, minimization system power consumption, two is for independently performing voltage detecting: when input voltage too low or unstable time send inform digital microprocessor module, it is made to take measures in time to avoid occurring control disorder, internal electric source administration module uses No. 1 port as input negative pole, uses 2 ports as input positive pole, described PWM module 112 for the setting according to digital microcontroller, the stable pwm signal producing certain frequency and duty ratio, and passes through the work of No. 6 output port drived control Bootstrap modules, described I/O controller module 113 is for providing the service with exchanges data and port driver for kernel control module, and pass through the break-make of No. 5 output port control switch modules, received the instruction of external switch control inputs by No. 7 input ports: or directly digital command signal is passed to digital microcontroller module 110 and analyze, or submit to digital microcontroller module 110 again after sending ADC module 115 to process conversion analog command signal and analyze, described non-volatile memory module 114 for storing the configuration data of decision threshold variable, and under the control of digital microcontroller module (110) internal data carry out writing, wipe, read operation, described ADC module 115 is analog-to-digital conversion module, for gathering sample amplitude when reproduced, sending digital microcontroller module 110 to and processing, to monitor and to judge that whether the voltage and current situation of load switch is normal after gained digital information being changed, ADC module uses No. 3 ports as current detecting input port, and No. 4 ports are as voltage detecting input port, described internal clocking module 116 provides clock signal needed for work for digital microcontroller.
Described supply module 00 comprises voltage-stabiliser tube DZ1, diode D1, linear voltage regulator N2, resistance R1 and electric capacity C1; Described linear voltage regulator N2 is used for adjusting with the low-voltage DC of stable output for other low-voltage circuit modules input voltage; Described voltage-stabiliser tube DZ1, for absorbing the high-voltage pulse in DC power supply, avoids linear voltage regulator N2 breakdown, and described diode D1 is used for preventing electric current adverse current, prevents DC power supply input change in polarity from affecting linear voltage regulator N2; Described resistance R1 and electric capacity C1 forms low-pass filter circuit, and the high frequency ripple on filtering linear voltage regulator N2 input, to improve linear voltage regulator N2 output quality.
Described voltage detection module 13 comprises resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, integrated transporting discharging N3A, integrated transporting discharging N3B and voltage-stabiliser tube DZ2; Described resistance R2 and resistance R3 forms the voltage sample value that bleeder circuit inputs to produce DC power supply, inputs to the integrated transporting discharging N3B adopting forward follower connection; Described integrated transporting discharging N3B is used for isolation, stablizes sampled signal; Described resistance R5, resistance R6, resistance R7 and integrated transporting discharging N3A form differential amplifier, process for carrying out adjustment to voltage sampling signal and export to kernel control module analysis; Described voltage-stabiliser tube DZ2 and resistance R4 is used for providing stable reference voltage for described differential amplifier.
Described current detection module 14 comprises resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, integrated transporting discharging N3C and integrated transporting discharging N3D; Described resistance R8 is sampling resistor, flows to the total current of load for gathering DC power supply; Described resistance R9, resistance R10, resistance R11 and resistance R12 form dropping resistor network, jointly carry out adjustment to current sampling signal with the differential amplifier be made up of integrated transporting discharging N3C and resistance R13, resistance R14, resistance R15, resistance R16 to process, then flow to kernel control module analysis; Described integrated transporting discharging N3D and resistance R17, resistance R18 provide quiescent operation point voltage, to reduce its magnification distortion for differential amplifier.
Described Bootstrap module 12 comprises resistance R19, resistance R20, resistance R21, resistance R22, electric capacity C3, diode D2, triode V1, triode V2, triode V3, triode V4 and voltage-stabiliser tube DZ3; Described R19 is current-limiting resistance, and its one end connects No. 6 output ports, i.e. the PWM module output port of kernel control module, the emitter of other end connecting triode V1 and triode V2; Described resistance R20 and resistance R21 forms bleeder circuit provides upset reference level for pwm signal, improves upset efficiency; Described electric capacity C3 is bootstrap capacitor, and resistance R22 is connected in series with electric capacity C3, for the current limliting that electric capacity C3 charges; Described diode D2 is for stoping electric capacity C3 electric current adverse current, limiting capacitance C3 output voltage peak value, protection switch module; Described triode V3 and triode V4, respectively by the driving of triode V1 and triode V2, realizes the isolation of high-low pressure and the break-make of low-voltage driving high pressure:
When PWM exports high level, triode V1 and triode V3 ends, triode V2 and triode V4 conducting, and DC power supply is charged to bootstrap capacitor C3 by D2 and R22, and electric capacity C3 rear maintenance both end voltage of having charged is identical with DC power supply; After PWM output becomes low level, triode V1 and triode V3 conducting, triode V2 triode V4 ends, and DC power supply raises electric capacity C3 negative terminal voltage by force, makes electric capacity C3 positive pole obtain 2 times to the electromotive force of direct current power source voltage; For the flash N-channel MOS pipe in driving switch module.
Described switch module 15 comprises resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, diode D3, diode D4, diode D5, triode V5, triode V6, triode V7, triode V8, triode V9, N-channel MOS pipe V10 and adjustable resistor RP1; Described R23 is current-limiting resistance, and its one end connects No. 5 output ports of kernel control module, the emitter of other end connecting triode V5 and triode V6; Described resistance R24 and resistance R25 forms bleeder circuit provides upset reference level for the switch controlling signal that kernel control module exports, and improves upset efficiency; Described triode V7 and triode V8, respectively by the driving of triode V5 and triode V6, realizes the isolation of high-low pressure and the break-make of low-voltage driving high pressure:
When switch controlling signal is low level, triode V6 and triode V8 ends, triode V5 and triode V7 conducting, and the high voltage that Bootstrap module exports is added to the grid level of N-channel MOS pipe V10 by current-limiting resistance R26, make N-channel MOS pipe V10 conducting, start as load supplying; When switch controlling signal is high level, triode V6 and triode V8 conducting, triode V5 and triode V7 ends, and N-channel MOS pipe V10 grid drags down voltage by diode D3 repid discharge, and N-channel MOS pipe V10 ends rapidly, cuts off the power supply to load.
Described triode V9, resistance R27 and adjustable resistor RP1 form negative-feedback circuit, for regulating the size of N-channel MOS pipe V10 grid maximum input voltage, are not punctured to protect N-channel MOS pipe V10 grid by too high voltages; Described diode D4, resistance R28 and electric capacity C4 form RC pulse absorption circuit, open source electrode in turn off process and the instantaneous high pressure pulse between drain electrode for absorbing the N-channel MOS pipe V10 caused by load, and V10 is not breakdown for protection N-channel MOS pipe; It is in perceptual situation that described diode D5 is used for load, is oad freewheels at N-channel MOS pipe V10 shutdown moment, and V10 is not breakdown for protection N-channel MOS pipe.
In above-described embodiment:
1. kernel control module described in is adopted as single integrated chip, as MC9S08QD2CSC chip, as conversion, in particular cases also can adopts the module assemblage with corresponding function at some;
2. the producing method of clock signal described in above-described embodiment is RC circuit mode, RC circuit clock frequency and precision are all lower, and temperature influence is comparatively large, as needs higher frequency, kernel control module can close internal clocking module, uses external external clock module to provide high frequency clock signal.
Working procedure and principle
By this switch-linear hybrid for accepting external level signal controlling mode of operation, open overcurrent, short-circuit protection and self-recovering function;
Connect DC power supply, supply module is started working, and the kernel control module self-inspection that powered on starts and waits for external switch instruction, and its PWM module does not now work, and maintained switch module is in off state;
Kernel control module receives external switch instruction and connects load, kernel control module opens PWM module after confirming instruction, Bootstrap module is made to start working as switch module provides voltage needed for driving N channel MOS tube, after Bootstrap module stable output is guaranteed in of short duration time delay, control switch module is open-minded, starts as load supplying;
After switch module is opened, the detection signal that kernel control module durations receiver voltage detection module, current detection module transmit, the setting threshold values prestored with self contrasts, and confirms present load working condition:
If testing result electric current and voltage is in normal range (NR), continue open-minded with regard to maintained switch module;
As detected, voltage is normal, and electric current surpasses threshold values, can be judged to be that load current is excessive, activate overcurrent protection program, the load of control switch module shuts down exports, after postponing one section of Preset Time, again control switch module opens load supplying, detect electric current and voltage situation and whether recover normal, as recovered normal, switch module is sustainable open-minded, as do not recovered normal, switch module turns off, and again attempts open-minded, and so forth after postponing one section of Preset Time;
As detected, voltage is lower than threshold voltage, electric current is higher than current threshold simultaneously, can be judged to occur load short circuits, activate short-circuit protection program, the load of control switch module shuts down exports, after postponing one section of Preset Time, again control switch module opens load supplying, detect electric current and voltage situation and whether recover normal, as recovered normal, switch module is sustainable open-minded; As do not recovered normal, switch module turns off, and again attempts open-minded after postponing one section of Preset Time; As after continuous 3 trials, electric current and voltage does not recover normal yet, can judge that this short trouble cannot be eliminated voluntarily, PWM module and quitting work from boost module, switch module switching off load, kernel control module also no longer does the trial recovering to open, till re-powering after the power-off of this intelligent switch.
Claims (7)
1. a high efficiency intelligence flash electronic load switch for voltage adaptability, is characterized in that: described intelligent flash electronic load switch comprises supply module (00), kernel control module (11), Bootstrap module (12), voltage detection module (13), current detection module (14) and switch module (15);
The input end interface of described kernel control module (11) connects the input of external switch control inputs, voltage detection module and current detection module respectively, and its output interface connects Bootstrap module and switch module respectively;
Described voltage detection module (13) is connected with supply module respectively with the input of current detection module (14), and its output connects the input end interface of kernel control module;
The described input of Bootstrap module (12) is connected with the output interface of kernel control module, the output connecting valve module of Bootstrap module;
Described supply module (00) input is connected with external power source, and output connects described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module respectively; Described supply module is used for accepting the input of externally fed power supply, and provides corresponding power supply for described kernel control module, Bootstrap module, current detection module, voltage detection module and switch module and detect access point;
Described kernel control module (11) is for signals collecting, information processing, storage and logic control: one is the detection signal accepting the output of external switch control inputs signal, current detection module and voltage detection module, and press internally stored program Treatment Analysis monitor data, control switch module completes corresponding actions, and two is for Bootstrap module provides pwm control signal;
Detection data for the real-time working voltage of sense switch module, and are passed to kernel control module Treatment Analysis by described voltage detection module (13);
Detection data for the real-time working electric current of sense switch module, and are passed to kernel control module Treatment Analysis by described current detection module (14);
Described Bootstrap module (12) for accepting the control of kernel control module, for the switching tube in switch module provides required driving voltage;
Described switch module (15), for accepting the control of kernel control module, performs the on-off action of load.
2. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 1, is characterized in that: described kernel control module (11) comprises digital microcontroller module (110), internal electric source administration module (111), PWM module (112), I/O controller module (113), non-volatile memory module (114), ADC module (115) and internal clocking module (116);
Described digital microcontroller module (110) is the control centre of kernel control module, for performing various calculating or instruction;
Described internal electric source administration module (111) is digital microcontroller module, non-volatile memory module, I/O controller module, ADC module, internal clocking module, PWM module provide suitable power supply management and control, one is the control for accepting digital microcontroller module, close or open the power supply of other modules except digital micro controller module, minimization system power consumption, two is for independently performing voltage detecting: when input voltage too low or unstable time send inform digital microprocessor module, make it take measures in time to avoid occurring control disorder; Internal electric source administration module uses No. 1 port as input negative pole, uses 2 ports as input positive pole;
Described PWM module (112) for the setting according to digital microcontroller, the stable pwm signal producing certain frequency and duty ratio, and passes through the work of No. 6 output port drived control Bootstrap modules;
Described I/O controller module (113) is for providing the service with exchanges data and port driver for kernel control module, and pass through the break-make of No. 5 output port control switch modules, the instruction of external switch control inputs is received by No. 7 input ports: or directly digital command signal is passed to digital microcontroller module (110) analysis, or submit to digital microcontroller module (110) analysis again after analog command signal being sent ADC module (115) to process conversion;
Described non-volatile memory module (114) for storing the configuration data of decision threshold variable, and under the control of digital microcontroller module (110) internal data carry out writing, wipe, read operation;
Described ADC module (115) is analog-to-digital conversion module, for gathering sample amplitude when reproduced, sends digital microcontroller module (110) process to, to monitor and to judge that whether the voltage and current situation of load switch is normal after gained digital information being changed; ADC module uses No. 3 ports as current detecting input port, and No. 4 ports are as voltage detecting input port;
Described internal clocking module (116) is for providing clock signal needed for work for digital microcontroller.
3. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 1 and 2, is characterized in that: described supply module (00) comprises voltage-stabiliser tube DZ1, diode D1, linear voltage regulator N2, resistance R1 and electric capacity C1;
Described linear voltage regulator N2 is used for adjusting with the low-voltage DC of stable output for other low-voltage circuit modules input voltage;
Described voltage-stabiliser tube DZ1, for absorbing the high-voltage pulse in DC power supply, avoids linear voltage regulator N2 breakdown, and described diode D1 is used for preventing electric current adverse current, prevents DC power supply input change in polarity from affecting linear voltage regulator N2;
Described resistance R1 and electric capacity C1 forms low-pass filter circuit, and the high frequency ripple on filtering linear voltage regulator N2 input, to improve linear voltage regulator N2 output quality.
4. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 3, is characterized in that: described voltage detection module (13) comprises resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, integrated transporting discharging N3A, integrated transporting discharging N3B and voltage-stabiliser tube DZ2;
Described resistance R2 and resistance R3 forms the voltage sample value that bleeder circuit inputs to produce DC power supply, inputs to the integrated transporting discharging N3B adopting forward follower connection;
Described integrated transporting discharging N3B is used for isolation, stablizes sampled signal;
Described resistance R5, resistance R6, resistance R7 and integrated transporting discharging N3A form differential amplifier, process for carrying out adjustment to voltage sampling signal and export to kernel control module analysis;
Described voltage-stabiliser tube DZ2 and resistance R4 is used for providing stable reference voltage for described differential amplifier.
5. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 4, is characterized in that: described current detection module (14) comprises resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, integrated transporting discharging N3C and integrated transporting discharging N3D;
Described resistance R8 is sampling resistor, flows to the total current of load for gathering DC power supply;
Described resistance R9, resistance R10, resistance R11 and resistance R12 form dropping resistor network, jointly carry out adjustment to current sampling signal with the differential amplifier be made up of integrated transporting discharging N3C and resistance R13, resistance R14, resistance R15, resistance R16 to process, then flow to kernel control module analysis;
Described integrated transporting discharging N3D and resistance R17, resistance R18 provide quiescent operation point voltage, to reduce its magnification distortion for differential amplifier.
6. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 5, is characterized in that: described Bootstrap module (12) comprises resistance R19, resistance R20, resistance R21, resistance R22, electric capacity C3, diode D2, triode V1, triode V2, triode V3, triode V4 and voltage-stabiliser tube DZ3;
Described R19 is current-limiting resistance, and its one end connects No. 6 output ports, i.e. the PWM module output port of kernel control module, the emitter of other end connecting triode V1 and triode V2;
Described resistance R20 and resistance R21 forms bleeder circuit provides upset reference level for pwm signal, improves upset efficiency;
Described electric capacity C3 is bootstrap capacitor, and resistance R22 is connected in series with electric capacity C3, for the current limliting that electric capacity C3 charges;
Described diode D2 is for stoping electric capacity C3 electric current adverse current, limiting capacitance C3 output voltage peak value, protection switch module;
Described triode V3 and triode V4, respectively by the driving of triode V1 and triode V2, realizes the isolation of high-low pressure and the break-make of low-voltage driving high pressure:
When PWM exports high level, triode V1 and triode V3 ends, triode V2 and triode V4 conducting, and DC power supply is charged to bootstrap capacitor C3 by D2 and R22, and electric capacity C3 rear maintenance both end voltage of having charged is identical with DC power supply;
After PWM output becomes low level, triode V1 and triode V3 conducting, triode V2 triode V4 ends, and DC power supply raises electric capacity C3 negative terminal voltage by force, makes electric capacity C3 positive pole obtain 2 times to the electromotive force of direct current power source voltage; For the flash N-channel MOS pipe in driving switch module.
7. the high efficiency intelligence flash electronic load switch of a kind of voltage adaptability according to claim 6, is characterized in that: described switch module (15) comprises resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, diode D3, diode D4, diode D5, triode V5, triode V6, triode V7, triode V8, triode V9, N-channel MOS pipe V10 and adjustable resistor RP1;
Described R23 is current-limiting resistance, and its one end connects No. 5 output ports of kernel control module, the emitter of other end connecting triode V5 and triode V6;
Described resistance R24 and resistance R25 forms bleeder circuit provides upset reference level for the switch controlling signal that kernel control module exports, and improves upset efficiency;
Described triode V7 and triode V8 is respectively by the driving of triode V5 and triode V6, realize the isolation of high-low pressure and the break-make of low-voltage driving high pressure: when switch controlling signal is low level, triode V6 and triode V8 ends, triode V5 and triode V7 conducting, the high voltage that Bootstrap module exports is added to the grid level of N-channel MOS pipe V10 by current-limiting resistance R26, make N-channel MOS pipe V10 conducting, start as load supplying; When switch controlling signal is high level, triode V6 and triode V8 conducting, triode V5 and triode V7 ends, and N-channel MOS pipe V10 grid drags down voltage by diode D3 repid discharge, and N-channel MOS pipe V10 ends rapidly, cuts off the power supply to load;
Described triode V9, resistance R27 and adjustable resistor RP1 form negative-feedback circuit, for regulating the size of N-channel MOS pipe V10 grid maximum input voltage, are not punctured to protect N-channel MOS pipe V10 grid by too high voltages;
Described diode D4, resistance R28 and electric capacity C4 form RC pulse absorption circuit, open source electrode in turn off process and the instantaneous high pressure pulse between drain electrode for absorbing the N-channel MOS pipe V10 caused by load, and V10 is not breakdown for protection N-channel MOS pipe;
It is in perceptual situation that described diode D5 is used for load, is oad freewheels at N-channel MOS pipe V10 shutdown moment, and V10 is not breakdown for protection N-channel MOS pipe.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106100292A (en) * | 2016-08-22 | 2016-11-09 | 上海怿星电子科技有限公司 | A kind of small power DC power supply able to programme and power configuration method |
| CN104079276B (en) * | 2014-06-28 | 2017-01-11 | 柳州长虹机器制造公司 | High-efficiency intelligent high-side electronic load switch with wide voltage adaptability |
| CN106788371A (en) * | 2016-12-23 | 2017-05-31 | 深圳市超力源科技有限公司 | A kind of low-voltage, high-current controls circuit |
| CN115776231A (en) * | 2022-12-26 | 2023-03-10 | 深圳市诚金晖精密机械有限公司 | High-precision power supply circuit for testing electronic equipment |
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- 2014-06-28 CN CN201420359668.0U patent/CN204046557U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104079276B (en) * | 2014-06-28 | 2017-01-11 | 柳州长虹机器制造公司 | High-efficiency intelligent high-side electronic load switch with wide voltage adaptability |
| CN106100292A (en) * | 2016-08-22 | 2016-11-09 | 上海怿星电子科技有限公司 | A kind of small power DC power supply able to programme and power configuration method |
| CN106788371A (en) * | 2016-12-23 | 2017-05-31 | 深圳市超力源科技有限公司 | A kind of low-voltage, high-current controls circuit |
| CN115776231A (en) * | 2022-12-26 | 2023-03-10 | 深圳市诚金晖精密机械有限公司 | High-precision power supply circuit for testing electronic equipment |
| CN115776231B (en) * | 2022-12-26 | 2023-12-08 | 深圳市诚金晖精密机械有限公司 | High-precision power supply circuit for electronic equipment test |
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