CN102005718A - Protector for electronic load and electronic load system - Google Patents
Protector for electronic load and electronic load system Download PDFInfo
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- CN102005718A CN102005718A CN2009101896913A CN200910189691A CN102005718A CN 102005718 A CN102005718 A CN 102005718A CN 2009101896913 A CN2009101896913 A CN 2009101896913A CN 200910189691 A CN200910189691 A CN 200910189691A CN 102005718 A CN102005718 A CN 102005718A
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Abstract
The invention provides a protector for an electronic load and an electronic load system, suitable for the field of DC electronic load, wherein the protector further comprises a low-voltage and reversed-polarity protective circuit, a voltage out-of-limit protective circuit, a current out-of-limit protective circuit and a power out-of-limit protective circuit. In the invention, the protector drive utilizes four freestanding protective circuits of the low-voltage and reversed-polarity protective circuit, the voltage out-of-limit protective circuit, the current out-of-limit protective circuit and the power out-of-limit protective circuit, and a drive circuit drives and controls the switching-on and the switching-off of a relay according to a control signal output by the protector, thereby controlling the switching-on and the switching-off of the electronic load main circuit so as to protect the electronic load.
Description
Technical field
The invention belongs to DC electronic load field, relate in particular to a kind of protective device and electronic load system that is used for electronic load.
Background technology
Electronic load is a kind of load in can the simulates real real environment, can adopt electronic load to detect the quality of power supply; Electronic load is control internal power MOSFET or a transistorized conducting amount, and the equipment of the dissipation power consumed power by power tube can detect load voltage accurately by electronic load, adjusts load current accurately; Can also realize the fictitious load short circuit.
Electronic load is divided into DC electronic load and alternating current electronic load, and electronic load has perfect defencive function; Wherein, defencive function is divided into internally (electronic load) defencive function and externally (equipment under test) defencive function: internally protection has: overvoltage protection, overcurrent protection, overpower protection, voltage reversal and overheat protector; Externally protection has: overcurrent protection, overpower protection is eaten live and is pressed and under-voltage protection.Selecting electronic load to select is the electronic load that has in the true protectorate.If function is by hard-wired, protection speed can be very fast.If realize that by software speed has hysteresis quality, and the words that module crashes will be caused danger.
In the prior art, the protective device that is used for electronic load utilizes single-chip microcomputer or DSP to cooperate hardware circuit to realize protection to the electronic load circuit with program more, and electronic load metal-oxide-semiconductor when energising directly is in "on" position; In the course of work, be in protection part at this moment detected state, thereby and its protection this moment partly just realizes that alarm output alert realizes the protection to electronic load detecting, but and incomplete realization cut off the work of main circuit; This mode construction cycle of while is longer, and cost is higher, is unfavorable for simply transplanting large tracts of land and promotes.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of simplicity of design, cooperates the protective device that is used for electronic load stable, that cost is low.
The embodiment of the invention is achieved in that a kind of protective device that is used for electronic load, and described protective device comprises:
Low pressure and reverse-connection protection circuit, its first input end connects the main circuit voltage signal of described electronic load, second input of described low pressure and reverse-connection protection circuit is connected reference voltage signal, and described main circuit voltage signal and described reference voltage signal are compared back output low pressure and reverse connecting protection control signal;
The voltage protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described voltage connects the main circuit voltage signal of described electronic load, and described main circuit voltage signal and described reference voltage signal are compared the back output voltage protection control signal that transfinites;
The electric current protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described electric current connects the main circuit current signal of described electronic load, and described main circuit current signal and described reference voltage signal are compared the back output current protection control signal that transfinites;
The power protective circuit that transfinites; its first input end connects outside command signal; transfinite second input of protective circuit of described power connects the maximum current command signal, and the command signal and the described maximum current command signal of described outside compared afterwards the power output protection control signal that transfinites.
Wherein, described low pressure and reverse-connection protection circuit further comprise: first comparator, first feedback resistance, first current-limiting resistance and second current resistor; The input in the same way of described first comparator connects the main circuit voltage signal of described electronic load by described first current-limiting resistance, and the input in the same way of described first comparator also is connected to the output of described first comparator by described feedback resistance; The reverse input end of described first comparator connects described reference voltage signal by described second current-limiting resistance; Described first comparator compares back output low pressure and reverse connecting protection control signal with the main circuit voltage signal of input input in the same way and the reference voltage signal of reverse input end input.
Wherein, the described voltage protective circuit that transfinites further comprises: second comparator, second feedback resistance, the 3rd current-limiting resistance and the 4th current resistor; The input in the same way of described second comparator connects described reference voltage signal by described the 3rd current-limiting resistance, and the input in the same way of described second comparator also is connected to the output of described second comparator by described second feedback resistance; The reverse input end of described second comparator is connected to the main circuit voltage signal of described electronic load by described the 4th current-limiting resistance; Described second comparator main circuit voltage signal of reference voltage signal and the reverse input end input of input input in the same way compares afterwards the output voltage protection control signal that transfinites.
Wherein, the described electric current protective circuit that transfinites further comprises: the 3rd comparator, the 3rd feedback resistance, the 5th current-limiting resistance and the 6th current resistor; The input in the same way of described the 3rd comparator is connected to described reference voltage signal by described the 5th current-limiting resistance, and the input in the same way of described the 3rd comparator also is connected to the output of described the 3rd comparator by described the 3rd feedback resistance; The reverse input end of described the 3rd comparator is connected to the main circuit current signal of described electronic load by described the 6th current-limiting resistance; Described the 3rd comparator main circuit current signal of reference voltage signal and the reverse input end input of input input in the same way compares afterwards the output current protection control signal that transfinites.
Wherein, the described power protective circuit that transfinites further comprises: the 4th comparator, the 7th current-limiting resistance and the 8th current resistor; The input in the same way of described the 4th comparator is connected to outside command signal by described the 7th current-limiting resistance; the reverse input end of described the 4th comparator is connected to described maximum current command signal by described the 8th current-limiting resistance, and described the 4th comparator maximum current command signal of command signal and the reverse input end input of the outside of input input in the same way compares afterwards the power output protection control signal that transfinites.
Another purpose of the embodiment of the invention also is to provide a kind of electronic load system, and it comprises current-order in the major loop that is connected to electronic load in turn and reference voltage generating circuit, protective device, drive circuit, relay and the control circuit that is connected to the control end of described electronic load; Described protective device comprises:
Low pressure and reverse-connection protection circuit, its first input end connects the main circuit voltage signal of described electronic load, second input of described low pressure and reverse-connection protection circuit is connected reference voltage signal, and described main circuit voltage signal and described reference voltage signal are compared back output low pressure and reverse connecting protection control signal;
The voltage protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described voltage connects the main circuit voltage signal of described electronic load, and described main circuit voltage signal and described reference voltage signal are compared the back output voltage protection control signal that transfinites;
The electric current protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described electric current connects the main circuit current signal of described electronic load, and described main circuit current signal and described reference voltage signal are compared the back output current protection control signal that transfinites;
The power protective circuit that transfinites, its first input end connects outside command signal, transfinite second input of protective circuit of described power connects the maximum current command signal, and the command signal and the described maximum current command signal of described outside compared afterwards the power output protection control signal that transfinites;
Described drive circuit is according to the break-make of the described relay of control signal drive controlling of described protective device output, and then controls the break-make of described electronic load major loop, thereby described electronic load is protected.
Protective device that the embodiment of the invention provides adopts low pressure and reverse-connection protection circuit, voltage protective circuit, electric current protective circuit and power four the independent protection circuit of protective circuit that transfinite that transfinite that transfinite; drive circuit is according to the break-make of the control signal drive controlling relay of protective device output; and then the break-make of control electronic load major loop, thereby electronic load is protected.
Description of drawings
Fig. 1 is the modular structure figure of the electronic load system that provides of the embodiment of the invention;
Fig. 2 is the circuit diagram of control circuit in the electronic load system that provides of the embodiment of the invention;
Fig. 3 is the protective device mesolow that is used for electronic load that provides of the embodiment of the invention and the circuit diagram of reverse-connection protection circuit;
Fig. 4 is the transfinite circuit diagram of protective circuit of the protective device voltage that is used for electronic load that the embodiment of the invention provides;
Fig. 5 is the transfinite circuit diagram of protective circuit of the protective device electric current that is used for electronic load that the embodiment of the invention provides;
Fig. 6 is the transfinite circuit diagram of protective circuit of the protective device power that is used for electronic load that the embodiment of the invention provides;
Fig. 7 is the circuit diagram of current-order and reference voltage generating circuit in the electronic load system that provides of the embodiment of the invention;
Fig. 8 is the circuit diagram of drive circuit in the electronic load system that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Protective device that the embodiment of the invention provides adopts low pressure and reverse-connection protection circuit, voltage protective circuit, electric current protective circuit and the power protective circuit that transfinites that transfinites that transfinites; drive circuit is according to the break-make of the control signal drive controlling relay of protective device output; and then the break-make of control electronic load major loop, thereby electronic load is protected.
Fig. 1 shows the modular structure of the electronic load system that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
Electronic load system comprises current-order in the major loop that is connected to electronic load 1 in turn and reference voltage generating circuit 3, protective device 4, drive circuit 5, relay 6 and the control circuit 2 that is connected to the control end of electronic load 1; Wherein, drive circuit 5 is according to the break-make of the control signal drive controlling relay 6 of protective device 4 outputs, and then the break-make of control electronic load 1 major loop, thereby electronic load 1 is protected.
In embodiments of the present invention, electronic load 1 can be metal-oxide-semiconductor or high-power IGBT; Cooperate drive circuits 5 to realize the relay 6 of DC electronic load main circuit is controlled break-make by protective device 4, thereby the break-make that can control main circuit realize the protective effect to metal-oxide-semiconductor or high-power IGBT.
The circuit diagram of control circuit 2 as shown in Figure 2, control circuit 2 is the closed-loop control basic circuit, comprise two discharge circuit A1, A2 and peripheral circuit, resistance R 1, the R2 link order signal Iout of the reverse input end of amplifier A1 wherein by once being connected in series, the end that is connected in series of resistance R 1, R2 is by capacitor C 1 ground connection, and the end that is connected in series of resistance R 1, R2 also is connected to the output of amplifier A1 by feedback resistance R3; The positive input of amplifier A1 is by resistance R 4 ground connection, and capacitor C 2 is connected between the output of the reverse input end of amplifier A1 and amplifier A1; The reverse input end of amplifier A2 is connected to the output of amplifier A1 by resistance R 5, and the positive input of amplifier A2 is by resistance R 6 ground connection; Capacitor C 7 is connected between the output of the reverse input end of amplifier A2 and amplifier A2, and an end of resistance R 7 is connected to the output of amplifier A2, and the other end of resistance R 7 connects electronic load, and the other end of resistance R 7 is also successively by voltage stabilizing didoe D1, D2 ground connection; Resistance R 8, R9 and capacitor C 8 are connected between the other end of the reverse input end of amplifier A2 and resistance R 7 successively, and an end of resistance R 0 is connected to the reverse input end of amplifier A2, and the other end of resistance R 0 is unsettled.
As one embodiment of the present of invention, amplifier A1 is negative circuit, and current-order is anti-phase, and inverting input input resistance R1, the R2 of amplifier A1 and the proportionate relationship between the feedback resistance R3 have determined the anti-phase multiple afterwards of current-order; Amplifier A2 is mainly in order to realize that current-order realizes control action to load, unsettled that end is to be connected to load end in the resistance R 0, when electronic load 1 was metal-oxide-semiconductor, unsettled that end was connected to the grid of metal-oxide-semiconductor in the resistance R 0, realized the FEEDBACK CONTROL to metal-oxide-semiconductor.And the resistance R 8 of the inverting input of amplifier A2 and output, R9 and capacitor C 8 are in order to realize the proportional integral of circuit to be regulated.Because control circuit 2 is a prior art for the closed-loop control basic circuit, therefore be not described in detail in this its operation principle.
In embodiments of the present invention; the final output Iout of the command signal of input is the final command output under several mode of operations in the control circuit 2; thereby realize control to major loop by it; thereby and the transfinite comparison decision output high-low level of Imax instruction and Iout in the protective circuit 44 of the power of protective device 4, thereby the break-make of control relay 6 realizes the protection to major loop.And Imax has a corresponding relation (as: Imax=0-10V, the electric current of corresponding reality is 0-120A) with electric current in the reality, and the current-order Iout in the major loop must satisfy this corresponding relation.
In embodiments of the present invention, protective device 4 further comprises: low pressure and reverse-connection protection circuit 41, voltage protective circuit 42, electric current protective circuit 43 and the power protective circuit 44 that transfinites that transfinites that transfinites; The first input end of its mesolow and reverse-connection protection circuit 41 is connected the main circuit voltage signal of electronic load 1, second input of low pressure and reverse-connection protection circuit 41 is connected reference voltage signal, and main circuit voltage signal and reference voltage signal are compared back output low pressure and reverse connecting protection control signal; The transfinite first input end of protective circuit 42 of voltage connects reference voltage signal, transfinite second input of protective circuit 42 of voltage connects the main circuit voltage signal of electronic load 1, and main circuit voltage signal and reference voltage signal are compared afterwards the output voltage protection control signal that transfinites; The transfinite first input end of protective circuit 43 of electric current connects reference voltage signal, transfinite second input of protective circuit 43 of electric current connects the main circuit current signal of electronic load 1, and main circuit current signal and reference voltage signal are compared afterwards the output current protection control signal that transfinites; The transfinite first input end of protective circuit 44 of power connects outside command signal, transfinite second input of protective circuit 44 of power connects the maximum current command signal, and the command signal and the maximum current command signal of outside compared afterwards the power output protection control signal that transfinites; Drive circuit 5 is according to the break-make of the control signal drive controlling relay 6 of protective device 4 outputs, and then the break-make of control electronic load 1 major loop, thereby electronic load 1 is protected.
In embodiments of the present invention, reference voltage VREF=4V, its physical significance is the maximum power value Pmax in the expression electronic load main circuit; Voltage feedback signal Y=3.3V is to 8V, corresponding to voltage feedback signal in the electronic load major loop is that Uback=10V is to 24V, and available current command signal Imax scope is made as 0 to 10V, and promptly Imax is the maximum current signal when the main circuit voltage value reaches maximum power.By known reference voltage VREF, Voltage Feedback input Y and its corresponding voltage feedback signal Uback, if the maximum power value Pmax of given circuit; Can obtain the current value of corresponding maximum current signal Imax and the major loop corresponding by formula Imax=10*VREF/Y, and the corresponding relation of the current-order of major loop and current value to design with reference to the corresponding relation of the calculating of this circuit with it.This is the place of the key of this circuit modular of realization.And some above corresponding relations (that is: 4V/Pmax=Y/Uback=Imax/I) user matching relationship voluntarily more than only be the use that circuit better is described for example.
As one embodiment of the present of invention, Fig. 3 shows the circuit diagram of low pressure and reverse-connection protection circuit 41, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
Low pressure and reverse-connection protection circuit 41 further comprise: first comparator 411, the first feedback resistance R25, first current-limiting resistance 412 and second current resistor 413; Wherein, the input in the same way of first comparator 411+connect the main circuit voltage signal Uback of electronic loads 1 by first current-limiting resistance 412, the input in the same way of first comparator 411+also the be connected to output 410 of first comparator 411 by feedback resistance R25; The reverse input end of first comparator 411-connect reference voltage VREF by second current-limiting resistance 413; First comparator 411 compares back output low pressure and reverse connecting protection control signal with the main circuit voltage signal Uback of input+input in the same way and the reference voltage signal VREF of reverse input end-input.
Wherein, first current-limiting resistance 412 further comprises: be connected in series in resistance R 21 and resistance R 24 between main circuit voltage signal Uback and the ground successively, the end that is connected in series of resistance R 21 and resistance R 24 be connected to the input in the same way of first comparator 411+.
Second current-limiting resistance 413 further comprises: be connected in series in resistance R 22, resistance R 23 and resistance R 20 between reference voltage VREF and the ground successively; Wherein resistance R 22 and the end that is connected in series of resistance R 23 be connected to the reverse input end of first comparator 411-; Resistance R 23 can be adjustable potentiometer, its adjustable end be connected to the reverse input end of first comparator 411-.
In embodiments of the present invention, low pressure and reverse-connection protection circuit 41 also comprise: resistance R 26, capacitor C 14, C15, wherein, an end ground connection of capacitor C 15, the other end of capacitor C 15 is connected to the output of first comparator 411 by resistance R 26, and the other end of capacitor C 15 also connects power supply+15V; One end ground connection of capacitor C 14, the other end of capacitor C 14 is connected to power supply-15V.
As one embodiment of the present of invention, Fig. 4 shows the transfinite circuit diagram of protective circuit 42 of voltage, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
The voltage protective circuit 42 that transfinites further comprises: second comparator 421, the second feedback resistance R41, the 3rd current-limiting resistance 422 and the 4th current resistor 423; Wherein, the input in the same way of second comparator 421+connect reference voltage signal VREF, the input in the same way of second comparator 421+also the be connected to output 420 of second comparator 421 by the second feedback resistance R41 by the 3rd current-limiting resistance 422; The reverse input end of second comparator 421-the be connected to main circuit voltage signal Uback of electronic load 1 by the 4th current-limiting resistance 423; The second comparator 421 main circuit voltage signal Uback of the reference voltage signal VREF of input+input and reverse input end-input in the same way compares afterwards the output voltage protection control signal that transfinites.
Wherein, the 3rd current-limiting resistance 422 further comprises: be connected in series in resistance R 37 and resistance R 40 between reference voltage signal VREF and the ground successively, the end that is connected in series of resistance R 37 and resistance R 40 be connected to the positive input of second comparator 421+.
The 4th current resistor 423 further comprises: the main circuit voltage signal Uback and the resistance R 36 between the ground, resistance R 38, resistance R 39 and the resistance R 42 that are connected to electronic load 1 successively, wherein resistance R 39 is adjustable resistances, its adjustable end be connected to the reverse input end of second comparator 421-.
As one embodiment of the present of invention, Fig. 5 shows the transfinite circuit diagram of protective circuit 43 of electric current, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
The electric current protective circuit 43 that transfinites further comprises: the 3rd comparator 431, the 3rd feedback resistance R32, the 5th current-limiting resistance 432 and the 6th current resistor 433; Wherein, the input in the same way of the 3rd comparator 431+be connected to reference voltage signal VREF, the input in the same way of the 3rd comparator 431+also the be connected to output 430 of the 3rd comparator 431 by the 3rd feedback resistance R32 by the 5th current-limiting resistance 432; The reverse input end of the 3rd comparator 431-the be connected to main circuit current signal Imback of electronic load 1 by the 6th current-limiting resistance 433; The 3rd comparator 431 main circuit current signal Imback of the reference voltage signal VREF of input+input and reverse input end-input in the same way compares afterwards the output current protection control signal that transfinites.
Wherein, the 5th current-limiting resistance 432 further comprises: be connected in series in resistance R 28 and resistance R 31 between reference voltage signal VREF and the ground successively, the end that is connected in series of resistance R 28 and resistance R 31 be connected to the positive input of the 3rd comparator 431+.
The 6th current-limiting resistance 433 further comprises: be connected in series in resistance R 27, resistance R 30 and resistance R 29 between main circuit current signal Imback and the ground successively; Wherein resistance R 29 and the end that is connected in series of resistance R 30 be connected to the reverse input end of the 3rd comparator 431-; Resistance R 30 can be adjustable potentiometer, its adjustable end be connected to the reverse input end of the 3rd comparator 431-.
As one embodiment of the present of invention, Fig. 6 shows the transfinite circuit diagram of protective circuit 44 of power, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows:
The power protective circuit 44 that transfinites further comprises: the 4th comparator 441, the 7th current-limiting resistance R61 and the 8th current resistor R62; Wherein, the input in the same way of the 4th comparator 441+be connected to outside command signal by the 7th current-limiting resistance R61; the reverse input end of the 4th comparator 441-be connected to maximum current command signal Imax by the 8th current-limiting resistance R62, the 4th comparator 441 the maximum current command signal Imax of the command signal of the outside of input+input and reverse input end-input in the same way compare afterwards the power output protection control signal that transfinites.
As one embodiment of the present of invention, the power protective circuit 44 that transfinites further comprises: resistance R 63, capacitor C 18, C19 and C20; Wherein resistance R 63 and capacitor C 18 are connected in series between the output 440 and ground of the 4th comparator 441 successively; Resistance R 63 is connected power supply+15V with the end that is connected in series of capacitor C 1; One end ground connection of capacitor C 19, the other end connects power supply-15V; One end ground connection of capacitor C 20, the other end is connected to the output 440 of the 4th comparator 441.
In embodiments of the present invention, the resistance of current-limiting resistance coupling is suitable, could can increase an easier realization ratio of adjustable potentiometer and regulate with the voltage control of major loop within the protection voltage range of oneself wanting, and can realize within limits regulating.
The protective device Ke that is used for electronic load that the embodiment of the invention provides realizes simple the transplanting with Hen Rong Yi Alto, and large tracts of land is promoted, and makes the design of DC electronic load more oversimplify maturing.
The circuit of current-order and reference voltage generating circuit 3 as shown in Figure 7, current-order and reference voltage generating circuit 3 comprise: reference voltage generation module 31, amplifier 34, amplifier 35, follower 36, follower 32, multiplier 33 and peripheral circuit; Wherein, the input IN connection+15V voltage of reference voltage generation module 31, the input IN of reference voltage generation module 31 is also by capacitor C 10 ground connection, the output of reference voltage generation module 31 is connected to the positive input of amplifier 34 by resistance R 15, and the output of reference voltage generation module 31 is also by capacitor C 11 ground connection; Resistance R 17, adjustable resistance R16 and resistance R 14 are connected between the output and ground of amplifier 34 successively, and the adjustable end of adjustable resistance R16 is connected to the reverse input end of amplifier 34; The positive input of amplifier 35 is connected to the output of amplifier 34, and the reverse input end of amplifier 35 is held by the W that resistance R 18 is connected to multiplier 33, and the output of amplifier 35 is by follower 36 output maximum current command signal Imax; The X1 end of multiplier 33 is connected to the output of amplifier 35, the X2 end of multiplier 33 and Y2 end ground connection, the Y1 end of multiplier 33 is connected to the output of follower 32, the positive input of follower 32 connects reference voltage signal VREF by diode D4, also connect main circuit voltage signal Uback, also by resistance R 34 ground connection by resistance R 33; Multiplier 33+VS end is by capacitor C 16 ground connection, multiplier 33-the VS end is by capacitor C 17 ground connection.
In embodiments of the present invention, produce the voltage reference that the resistance of the inverting input adjustable resistance R16 of a reference voltage by regulating amplifier 34 can obtain to want by reference voltage generation module 31.And that the in-phase input end resistance R 33 of amplifier 32 and R34 can realize Voltage Feedback Uback is scaled, inputs to the Y1 end of multiplier 33 by follower 32, realizes real-time operation.
As one embodiment of the present of invention, reference voltage generation module 31 can adopt the MC1403 chip, can produce the reference voltage of 2.5V; Multiplier 33 can adopt the AD633 chip, and wherein the AD633 chip has a computing formula: (X1-X2) (Y1-Y2)/10+Vz=Vw; With X1=Imax, X2=Uback*R34/ (R33+R34) and Vw=Vref substitution following formula can be realized operation relation.
The circuit diagram of drive circuit 5 for convenience of explanation, only shows the part relevant with the embodiment of the invention as shown in Figure 8, and details are as follows:
The input 50 of drive circuit 5 is connected to the output 410 of low pressure and reverse-connection protection circuit 41 respectively, the transfinite output 420 of protective circuit 42 of voltage, electric current the transfinite output 440 of protective circuit 44 of the output 430 of protective circuit 43 and power that transfinites.Realize driving by chip for driving 51, by chip for driving 53 outputs and realize driving, can indicate running status by LED lamp LED1 to relay 6 by optical coupling isolator 52 backs to level signal.
Protective device that the embodiment of the invention provides adopts low pressure and reverse-connection protection circuit, voltage protective circuit, electric current protective circuit and power four the independent protection circuit of protective circuit that transfinite that transfinite that transfinite; drive circuit is according to the break-make of the control signal drive controlling relay of protective device output; and then the break-make of control electronic load major loop, thereby electronic load is protected.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a protective device that is used for electronic load is characterized in that, described protective device comprises:
Low pressure and reverse-connection protection circuit, its first input end connects the main circuit voltage signal of electronic load, second input of described low pressure and reverse-connection protection circuit is connected reference voltage signal, and described main circuit voltage signal and described reference voltage signal are compared back output low pressure and reverse connecting protection control signal;
The voltage protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described voltage connects the main circuit voltage signal of described electronic load, and described main circuit voltage signal and described reference voltage signal are compared the back output voltage protection control signal that transfinites;
The electric current protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described electric current connects the main circuit current signal of described electronic load, and described main circuit current signal and described reference voltage signal are compared the back output current protection control signal that transfinites;
The power protective circuit that transfinites; its first input end connects outside command signal; transfinite second input of protective circuit of described power connects the maximum current command signal, and the command signal and the described maximum current command signal of described outside compared afterwards the power output protection control signal that transfinites.
2. the protective device that is used for electronic load as claimed in claim 1 is characterized in that, described low pressure and reverse-connection protection circuit further comprise:
First comparator, first feedback resistance, first current-limiting resistance and second current resistor;
The input in the same way of described first comparator connects the main circuit voltage signal of described electronic load by described first current-limiting resistance, and the input in the same way of described first comparator also is connected to the output of described first comparator by described feedback resistance;
The reverse input end of described first comparator connects described reference voltage signal by described second current-limiting resistance;
Described first comparator compares back output low pressure and reverse connecting protection control signal with the main circuit voltage signal of input input in the same way and the reference voltage signal of reverse input end input.
3. the protective device that is used for electronic load as claimed in claim 1 is characterized in that, the described voltage protective circuit that transfinites further comprises:
Second comparator, second feedback resistance, the 3rd current-limiting resistance and the 4th current resistor;
The input in the same way of described second comparator connects described reference voltage signal by described the 3rd current-limiting resistance, and the input in the same way of described second comparator also is connected to the output of described second comparator by described second feedback resistance;
The reverse input end of described second comparator is connected to the main circuit voltage signal of described electronic load by described the 4th current-limiting resistance;
Described second comparator main circuit voltage signal of reference voltage signal and the reverse input end input of input input in the same way compares afterwards the output voltage protection control signal that transfinites.
4. the protective device that is used for electronic load as claimed in claim 1 is characterized in that, the described electric current protective circuit that transfinites further comprises:
The 3rd comparator, the 3rd feedback resistance, the 5th current-limiting resistance and the 6th current resistor;
The input in the same way of described the 3rd comparator is connected to described reference voltage signal by described the 5th current-limiting resistance, and the input in the same way of described the 3rd comparator also is connected to the output of described the 3rd comparator by described the 3rd feedback resistance;
The reverse input end of described the 3rd comparator is connected to the main circuit current signal of described electronic load by described the 6th current-limiting resistance;
Described the 3rd comparator main circuit current signal of reference voltage signal and the reverse input end input of input input in the same way compares afterwards the output current protection control signal that transfinites.
5. the protective device that is used for electronic load as claimed in claim 1 is characterized in that, the described power protective circuit that transfinites further comprises:
The 4th comparator, the 7th current-limiting resistance and the 8th current resistor;
The input in the same way of described the 4th comparator is connected to outside command signal by described the 7th current-limiting resistance; the reverse input end of described the 4th comparator is connected to described maximum current command signal by described the 8th current-limiting resistance, and described the 4th comparator maximum current command signal of command signal and the reverse input end input of the outside of input input in the same way compares afterwards the power output protection control signal that transfinites.
6. electronic load system, it comprises current-order in the major loop that is connected to electronic load in turn and reference voltage generating circuit, protective device, drive circuit, relay and the control circuit that is connected to the control end of described electronic load; It is characterized in that described protective device comprises:
Low pressure and reverse-connection protection circuit, its first input end connects the main circuit voltage signal of described electronic load, second input of described low pressure and reverse-connection protection circuit is connected reference voltage signal, and described main circuit voltage signal and described reference voltage signal are compared back output low pressure and reverse connecting protection control signal;
The voltage protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described voltage connects the main circuit voltage signal of described electronic load, and described main circuit voltage signal and described reference voltage signal are compared the back output voltage protection control signal that transfinites;
The electric current protective circuit that transfinites, its first input end connects reference voltage signal, transfinite second input of protective circuit of described electric current connects the main circuit current signal of described electronic load, and described main circuit current signal and described reference voltage signal are compared the back output current protection control signal that transfinites;
The power protective circuit that transfinites, its first input end connects outside command signal, transfinite second input of protective circuit of described power connects the maximum current command signal, and the command signal and the described maximum current command signal of described outside compared afterwards the power output protection control signal that transfinites;
Described drive circuit is according to the break-make of the described relay of control signal drive controlling of described protective device output, and then controls the break-make of described electronic load major loop, thereby described electronic load is protected.
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| CN200910189691.3A CN102005718B (en) | 2009-08-31 | 2009-08-31 | Protector for electronic load and electronic load system |
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| CN200910189691.3A CN102005718B (en) | 2009-08-31 | 2009-08-31 | Protector for electronic load and electronic load system |
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| CN102005718B CN102005718B (en) | 2015-02-04 |
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| CN200910189691.3A Active CN102005718B (en) | 2009-08-31 | 2009-08-31 | Protector for electronic load and electronic load system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036211A (en) * | 2012-12-14 | 2013-04-10 | 南京劳伦斯电子科技有限公司 | High-frequency high-pressure high-power switch power source main circuit protective circuit |
| CN103545804A (en) * | 2013-07-23 | 2014-01-29 | 特变电工新疆新能源股份有限公司 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
| CN104777517A (en) * | 2015-03-12 | 2015-07-15 | 北京中矿大地地球探测工程技术有限公司 | Transmitting circuit of transmitter in prospecting equipment using transient electromagnetic method |
| CN106126390A (en) * | 2016-06-28 | 2016-11-16 | 张升泽 | The power alarm method and system of electronic chip |
| WO2018000171A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for power alarm for electronic chip |
| CN109765502A (en) * | 2019-03-13 | 2019-05-17 | 哈尔滨工业大学 | A kind of program-controlled DC Electronic Loads |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
| CN113675817A (en) * | 2021-07-02 | 2021-11-19 | 富满微电子集团股份有限公司 | Overvoltage protection circuit, overvoltage protection method and chip |
| CN118033181A (en) * | 2024-02-26 | 2024-05-14 | 湖南恩智测控技术有限公司 | Reverse connection prevention protection electronic load, system and method for testing high-voltage charging pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103036211A (en) * | 2012-12-14 | 2013-04-10 | 南京劳伦斯电子科技有限公司 | High-frequency high-pressure high-power switch power source main circuit protective circuit |
| CN103545804A (en) * | 2013-07-23 | 2014-01-29 | 特变电工新疆新能源股份有限公司 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
| CN103545804B (en) * | 2013-07-23 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Direct-current input end inverted connection protecting circuit, direct-current input end inverted connection protecting method and direct-current input equipment |
| CN104777517A (en) * | 2015-03-12 | 2015-07-15 | 北京中矿大地地球探测工程技术有限公司 | Transmitting circuit of transmitter in prospecting equipment using transient electromagnetic method |
| CN106126390A (en) * | 2016-06-28 | 2016-11-16 | 张升泽 | The power alarm method and system of electronic chip |
| WO2018000171A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for power alarm for electronic chip |
| CN109765502A (en) * | 2019-03-13 | 2019-05-17 | 哈尔滨工业大学 | A kind of program-controlled DC Electronic Loads |
| CN109765502B (en) * | 2019-03-13 | 2020-12-01 | 哈尔滨工业大学 | Program-controlled direct current electronic load |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
| CN113675817A (en) * | 2021-07-02 | 2021-11-19 | 富满微电子集团股份有限公司 | Overvoltage protection circuit, overvoltage protection method and chip |
| CN118033181A (en) * | 2024-02-26 | 2024-05-14 | 湖南恩智测控技术有限公司 | Reverse connection prevention protection electronic load, system and method for testing high-voltage charging pile |
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