CN217445022U - Electronic load reverse connection protection circuit - Google Patents
Electronic load reverse connection protection circuit Download PDFInfo
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- CN217445022U CN217445022U CN202221058238.6U CN202221058238U CN217445022U CN 217445022 U CN217445022 U CN 217445022U CN 202221058238 U CN202221058238 U CN 202221058238U CN 217445022 U CN217445022 U CN 217445022U
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Abstract
The embodiment of the utility model provides a pair of electronic load joins conversely protection circuit belongs to circuit protection technical field. The electronic load reverse connection protection circuit comprises an electronic load circuit and a load reverse connection protection circuit; the electronic load circuit includes: the circuit comprises a first input interface, a second resistor, a constant current unit and a control unit; the load reverse connection protection circuit comprises a differential circuit, a first receipt comparison circuit, a second receipt comparison circuit, a driving circuit and a switch circuit. This application is through setting up the load reverse connection protection circuit on current electronic load circuit to realize electronic load's reverse connection protect function, in order to reduce the potential safety hazard. The high-current load function can be realized, and the technical problem that the use scene is limited is solved.
Description
Technical Field
The utility model relates to a circuit protection technical field particularly, relates to an electronic load joins conversely protection circuit.
Background
Most of the current electronic loads are devices that consume electric energy by means of dissipation power of a power tube by controlling the turn-on amount of internal power (MOSFET). The device can accurately detect load voltage, accurately adjust load current, and simultaneously realize the short circuit of a simulation load, wherein the simulation load has the functions of inductive resistance, capacitive load current rise time and the like, and is indispensable equipment for debugging and detecting a common switching power supply.
Referring to fig. 1, which is a typical architecture diagram of an electronic load, J1 is that an input port is linked to the positive input terminal of a load constant-current unit, J2 is that the input port is connected to the negative terminal of the constant-current unit, and there is an equivalent diode D1 at the positive and negative terminals of the constant-current unit, when J1 inputs a negative voltage and J2 inputs a positive voltage, current flows through the equivalent diode D1 via J2 and returns to the input terminal J1, only the reverse connection alarm function is retained, when the input power supply current ratio is large, damage to the power supply or the load is likely to be caused, and when the input source is a battery, fire or explosion crisis more likely to be caused.
Therefore, how to overcome the above problems is a technical problem which needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electronic load joins conversely protection circuit, its transposition protect function that can realize electronic load.
The embodiment of the utility model is realized like this:
the utility model provides an electronic load reverse connection protection circuit, which comprises an electronic load circuit and a load reverse connection protection circuit;
the electronic load circuit is connected with the load reverse connection protection circuit;
the electronic load circuit includes:
the circuit comprises a first input interface, a second resistor, a constant current unit and a control unit;
the first input interface and the second input interface are respectively connected with the control unit and the constant current unit through the load reverse connection protection circuit;
one end of the second resistor is connected with the second input interface, and the other end of the second resistor is respectively connected with the load reverse connection protection circuit and the constant current unit;
the load reverse connection protection circuit comprises:
the differential circuit, the first receipt comparison circuit, the second receipt comparison circuit, the driving circuit and the switch circuit;
a first input end of the differential circuit is connected with the first input interface, a second input end of the differential circuit is connected with the second input interface, and an output end of the differential circuit is connected with a first input end of the first response comparison circuit;
a second input end of the first receipt comparison circuit is grounded, and an output end of the first receipt comparison circuit is respectively connected with an input end of the driving circuit and a control end of the control unit;
the output end of the second receipt comparison circuit is connected with the control end of the control unit, the first input end of the second receipt comparison circuit is connected between the second resistor and the constant current unit, and the second input end of the second receipt comparison circuit is grounded;
the output end of the driving circuit is connected with the control end of the switch circuit;
the first end of the switch circuit is connected with the second input interface, and the second end of the switch circuit is connected with the second resistor;
and the common joint of the second end of the switch circuit and the second resistor is grounded.
In a possible embodiment, the switching circuit includes:
the circuit comprises a switching tube, a first capacitor and a first resistor;
the control end of the switching tube is connected with the output end of the driving circuit;
the second input interface and one end of the first capacitor are connected with the first end of the switch tube, the other end of the first capacitor is connected with one end of the first resistor in series, and the other end of the second resistor and the other end of the first resistor are connected with the second end of the switch tube.
In a possible embodiment, the driving circuit includes:
the driving chip, the fifth resistor and the sixteenth resistor;
the input end of the driving chip is respectively connected with one end of the sixteenth resistor and the control end of the control unit;
the fifth resistor is arranged between the output end of the driving chip and the control end of the switch tube;
the other end of the sixteenth resistor is grounded.
In one possible embodiment, the second receipt comparing circuit includes:
the circuit comprises a second operational amplifier, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor and a second diode;
the first input end of the second operational amplifier is connected between the second resistor and the constant current unit through the third resistor;
the second input end of the second operational amplifier is connected with a power supply through the sixth resistor, and the second input end of the second operational amplifier is grounded through the seventh resistor;
one end of the fourth resistor is connected between the first input end of the second operational amplifier and the third resistor, and the other end of the fourth resistor is connected with the output end of the second operational amplifier;
the anode of the second diode is connected with the output end of the second operational amplifier, and the cathode of the second diode is connected with the output end of the first return comparison circuit.
In a possible embodiment, the first loop comparison circuit includes:
a fourth operational amplifier, a ninth resistor, an eleventh resistor, a fourteenth resistor and a seventeenth resistor;
the output end of the fourth operational amplifier is respectively connected with the cathode of the second diode, the sixteenth resistor and the control end of the control unit;
one end of the ninth resistor is connected with the first input end of the fourth operational amplifier, and the other end of the ninth resistor is connected with the output end of the fourth operational amplifier;
the eleventh resistor is arranged between the first input end of the fourth operational amplifier and the output end of the differential circuit;
the second input end of the fourth operational amplifier is connected to a power supply through the fourteenth resistor, and the second input end of the fourth operational amplifier is grounded through the seventeenth resistor.
In a possible embodiment, the differential circuit includes:
a third operational amplifier, an eighth resistor, a tenth resistor, a thirteenth resistor and a fifteenth resistor;
the output end of the third operational amplifier is connected with the eleventh resistor;
one end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the first input end of the third operational amplifier;
one end of the tenth resistor is connected with the first input interface, and the other end of the tenth resistor is connected with the first input end of the third operational amplifier;
one end of the thirteenth resistor is connected with the second input interface, and the other end of the thirteenth resistor is connected with the second input end of the third operational amplifier;
one end of the fifteenth resistor is connected with the second input end of the third operational amplifier, and the other end of the fifteenth resistor is connected with the output end of the third operational amplifier.
In a possible embodiment, the method further comprises:
a third diode and a twelfth resistor;
the anode of the third diode is connected with the output end of the fourth operational amplifier;
the negative electrode of the third diode is connected with one end of the twelfth resistor;
the negative electrode of the second diode is connected between the negative electrode of the third diode and the twelfth resistor;
the other end of the twelfth resistor is connected with the sixteenth resistor and the control end of the control unit respectively.
In a possible embodiment, the device further comprises a fourth diode;
the cathode of the fourth diode is connected with the control end of the control unit;
and the anode of the fourth diode is respectively connected with the twelfth resistor and the sixteenth resistor.
Above-mentioned the utility model provides a pair of electronic load joins conversely protection circuit through setting up the load and joins conversely protection circuit on current electronic load circuit to realize electronic load's the protection function that joins conversely, with the reduction potential safety hazard.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an electronic load circuit provided in the prior art.
Fig. 2 is a schematic diagram of another electronic load circuit provided in the prior art.
Fig. 3 is a schematic structural diagram of an electronic load reverse connection protection circuit according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Most of the current electronic loads are devices that consume electric energy by means of dissipation power of a power tube by controlling the turn-on amount of internal power (MOSFET). The device can accurately detect load voltage, accurately adjust load current, and simultaneously realize the short circuit of a simulation load, wherein the simulation load has the functions of inductive resistance, capacitive load current rise time and the like, and is indispensable equipment for debugging and detecting a common switching power supply.
As shown in fig. 1, fig. 1 is a typical architecture diagram of an electronic load, J1 is that an input port is linked to the positive input terminal of a load constant current unit, J2 is that the input port is connected to the negative terminal of the constant current unit, and there is an equivalent diode D1 at the positive and negative terminals of the constant current unit, when J1 inputs a negative voltage and J2 inputs a positive voltage, current flows through the equivalent diode D1 via J2 and returns to the input terminal J1, only the reverse connection alarm function is retained, when the input power supply current ratio is large, it is very likely to cause damage to the power supply or the load, and when the input source is a battery, it is more likely to cause fire or explosion hazards.
For another example, as shown in fig. 2, a diode D2 is connected in series to an electronic load input terminal J1 or J2 by some manufacturers as a reverse protection of the electronic load, but the diode has a certain voltage drop, so that it is difficult to realize a large current load within 1V of voltage, and a use scenario is limited.
Therefore, in order to solve the above problems, the present application proposes an electronic load reverse connection protection circuit, and in particular, as shown in fig. 3, the electronic load reverse connection protection circuit 100 includes an electronic load circuit and a load reverse connection protection circuit.
Wherein the electronic load circuit is connected with the load reverse connection protection circuit.
Optionally, an electronic load circuit, comprising: the constant current circuit comprises a first input interface J1, a second input interface J2, a second resistor R2, a constant current unit 110 and a control unit 120.
The first input interface J1 and the second input interface J2 are respectively connected with the control unit 120 and the constant current unit 110 through the load reverse connection protection circuit;
one end of the second resistor R2 is connected to the second input interface J2, and the other end of the second resistor R2 is connected to the load reverse connection protection circuit and the constant current unit 110, respectively.
A control terminal (i.e., ON/OFF as shown) of the control unit 120 is connected to a control terminal (i.e., ON/OFF as shown) of the constant current unit 110.
Optionally, the load reverse connection protection circuit includes: differential circuit 130, first receipt comparison circuit 140, second receipt comparison circuit 150, drive circuit, and switch circuit 170.
A first input of the differential circuit 130 is connected to the first input interface J1, a second input of the differential circuit 130 is connected to the second input interface J2, and an output of the differential circuit 130 is connected to a first input of the first replay comparator circuit 140;
a second input terminal of the first receipt comparing circuit 140 is grounded, and an output terminal of the first receipt comparing circuit 140 is respectively connected to the input terminal of the driving circuit and the control terminal of the control unit 120;
the output end of the second response piece comparison circuit 150 is connected with the control end of the control unit 120, the first input end of the second response piece comparison circuit 150 is connected between the second resistor R2 and the constant current unit 110, and the second input end of the second response piece comparison circuit 150 is grounded;
the output end of the driving circuit is connected with the control end of the switch circuit 170;
a first end of the switch circuit 170 is connected to the second input interface J2, and a second end of the switch circuit 170 is connected to the second resistor R2;
the common junction of the second terminal of the switching circuit 170 and the second resistor R2 is grounded.
Optionally, the switching circuit 170 includes: a switch tube Q1, a first capacitor C1 and a first resistor R1.
Optionally, the switching transistor Q1 is a MOS transistor.
Wherein, the control end (i.e. the gate) of the switching tube 170 is connected with the output end of the driving circuit;
one end of the second input interface J2 and one end of the first capacitor C1 are both connected to a first end (e.g., source/drain) of the switch transistor Q1, the other end of the first capacitor C1 is connected in series with one end of the first resistor R1, and the other ends of the second resistor R2 and the first resistor R1 are both connected to a second end (e.g., drain/source) of the switch transistor Q1.
Optionally, the driving circuit includes: a driving chip U1, a fifth resistor R5 and a sixteenth resistor R16.
The input terminal of the driving chip U1 is respectively connected to one terminal of the sixteenth resistor R16 and the control terminal (i.e., the ON/OFF port in the figure) of the control unit 120;
the fifth resistor R5 is arranged between the output end of the driving chip U1 and the control end of the switching tube Q1; the other end of the sixteenth resistor R16 is grounded.
Optionally, the second receipt comparing circuit 150 includes: a second operational amplifier U2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7 and a second diode D2.
A first input end of the second operational amplifier U2 is connected between the second resistor R2 and the constant current unit 110 through the third resistor R3, and specifically, the first input end of the second operational amplifier U2 is connected to the negative input of the constant current unit 110 through the third resistor R3;
the second input terminal of the second operational amplifier U2 is connected to a power supply (e.g., a positive 5v input power supply) through the sixth resistor R6, and the second input terminal of the second operational amplifier U2 is connected to ground through the seventh resistor R7;
one end of the fourth resistor R4 is connected between the first input end of the second operational amplifier U2 and the third resistor R3, and the other end of the fourth resistor R4 is connected with the output end of the second operational amplifier U2;
the anode of the second diode D2 is connected to the output of the second operational amplifier U2, and the cathode of the second diode D2 is connected to the output of the first loop comparison circuit 140.
Optionally, the first input of the second operational amplifier U2 is a positive input and the second input of the second operational amplifier U2 is a negative input.
It should be understood that the second response piece comparison circuit 150 is used to compare the voltage of the second resistor R2, when there is a current flowing from the right end to the left end of the second resistor R2, a certain positive voltage drop will be formed on the second resistor R2, the seventh resistor R7 sets the reference terminal of the second operational amplifier U2 through a +5V and the sixth resistor R6, and when the current is greater than a certain value, the output of the second operational amplifier U2 is high.
Optionally, the first receipt comparing circuit 140 includes: a fourth operational amplifier U4, a ninth resistor R9, an eleventh resistor R11, a fourteenth resistor R14, and a seventeenth resistor R17.
An output end of the fourth operational amplifier U4 is respectively connected to a cathode of the second diode D2, the sixteenth resistor R16 and a control end of the control unit 120;
one end of the ninth resistor R9 is connected to the first input end of the fourth operational amplifier U4, and the other end of the ninth resistor R9 is connected to the output end of the fourth operational amplifier U4;
the eleventh resistor R11 is disposed between the first input terminal of the fourth operational amplifier U4 and the output terminal of the differential circuit 130;
the second input terminal of the fourth operational amplifier U4 is connected to a power supply (e.g., negative 5 v) through the fourteenth resistor R14, and the second input terminal of the fourth operational amplifier U4 is connected to ground through the seventeenth resistor R17.
Optionally, the first input of the fourth operational amplifier U4 is a positive going input and the second input of the fourth operational amplifier U4 is a negative going input.
It should be understood that the first loop back comparison circuit 140 is used to set the reference voltage of the third operational amplifier U3 to be higher than OV when the voltages of the input terminals of the first input interface J1 to the second input interface J2 are higher than OV, and the reference terminal of the fourth operational amplifier U4 is set to be lower than OV by a-5V power supply and the fourteenth and seventeenth resistors R14 and R17, so that the output of the fourth operational amplifier U4 is high when the voltages of the input terminals of the first input interface J1 to the second input interface J2 are higher than a negative voltage.
The differential circuit 130 is used for proportionally attenuating the voltage of the first input interface J1 to the second input interface J2.
Optionally, the differential circuit 120 includes: a third operational amplifier U3, an eighth resistor R8, a tenth resistor R10, a thirteenth resistor R13, and a fifteenth resistor R15;
the output end of the third operational amplifier U3 is connected with the eleventh resistor R11;
one end of the eighth resistor R8 is grounded, and the other end of the eighth resistor R8 is connected with the first input end of the third operational amplifier U3;
one end of the tenth resistor R10 is connected to the first input interface J1, and the other end of the tenth resistor R10 is connected to the first input terminal of the third operational amplifier U3;
one end of the thirteenth resistor R13 is connected to the second input interface, and the other end of the thirteenth resistor R13 is connected to the second input terminal of the third operational amplifier U3;
one end of the fifteenth resistor R15 is connected to the second input terminal of the third operational amplifier U3, and the other end of the fifteenth resistor R15 is connected to the output terminal of the third operational amplifier U3.
Optionally, the first input of the third operational amplifier U3 is a positive input; the second input of the third operational amplifier U3 is a negative going input.
Optionally, the electronic load reverse connection protection circuit 100 further includes: a third diode D3 and a twelfth resistor R12.
The anode of the third diode D3 is connected with the output end of a fourth operational amplifier U4;
a cathode of the third diode D3 is connected to one end of the twelfth resistor R12;
the cathode of the second diode D2 is connected between the cathode of the third diode D3 and the twelfth resistor R12;
the other end of the twelfth resistor R12 is connected to the sixteenth resistor R16 and the control end of the control unit 120, respectively.
Optionally, the reverse connection protection circuit 100 of the electronic load further includes a fourth diode D4; the cathode of the fourth diode D4 is connected to the control terminal of the control unit 120;
the anodes of the fourth diode D4 are connected to the twelfth resistor R12 and the sixteenth resistor R16, respectively.
In one embodiment, when the voltage input to the first input interface J1 is positive, and the voltage input to the second input interface J2 is negative, the control unit 120 controls the ON/OFF signal to turn ON or OFF the constant current unit 110. Current flows from the first input interface J1 to the positive input terminal of the constant current unit 110, flows out from the negative input terminal of the constant current unit 110, and flows through the S-stage (i.e., the source stage) of the switching tube Q1 via the second resistor R2 (the second resistor R2 is a resistor with a rated resistance), and since a parasitic diode exists between the source and drain of the switching tube Q1, current can flow from the S-stage to the D-stage (the drain) even if the driving G-stage (the gate) is low. And finally out through stage D to the second input interface J2. If the G level of the switch Q1 is high at this time, the switch Q1 is turned on to present a low-resistance state, and the first input interface J1 and the second input interface J2 can realize a large current on-load even if the input voltage is lower than 1V.
When the input of the first input interface J1 is negative and the input of the second input interface J2 is positive, as long as the G level of the switching transistor Q1 is not high, the switching transistor Q1 is equivalent to a diode, and the current cannot flow through the switching transistor Q1, i.e., cannot flow through the parasitic diode D1 of the constant current unit 110 to the first input interface J1, so as to perform the reverse connection protection. The RC added at the two ends of the switch tube Q1 consists of a first capacitor C1 and a first resistor R1, so that the slope of voltage rise between DS (source and drain) of the switch tube Q1 when the voltage is suddenly switched on in a reverse direction can be effectively relieved, and the peak of reverse connection voltage is restrained.
The working principle is as follows:
according to the application, the voltage between a first input interface J1 and a second input interface J2 is proportionally attenuated through a differential circuit 130, the voltage of a second resistor R2 is compared through a second response comparison circuit 150, when current flows from the right end to the left end of the second resistor R2, a certain positive voltage drop can be formed on the second resistor R2, a reference end of a second operational amplifier U2 is arranged through a +5V resistor and a sixth resistor R6 through a seventh resistor R7, and when the current is larger than a certain value, the output of the second operational amplifier U2 is in a high level. The fourth operational amplifier U4 and the second operational amplifier U2 are connected together through a diode (i.e., the third diode D3 and the second diode D2), and are divided by a current limiting resistor twelfth resistor R12 and a sixteenth resistor R16, and a voltage division point connects a fourth diode D4 to an ON/OFF port of the control unit 120. Meanwhile, one end of a sixteenth resistor R16 is connected to an input port of the driving chip U1, an output port of the driving chip U1 is connected to the G level of the switching tube Q1 through a fifth resistor R5, when the input port of the driving chip U1 is high, the output is also high, the switching tube Q1 is turned on, when the input port of the driving chip U1 is low, the output is also low, and the switching tube Q1 is turned off (equivalent to a diode at this time).
When the input is connected reversely, the input voltage is far lower than OV, the output of the fourth operational amplifier U4 is low, and meanwhile, the second resistor R2 has no current or has a negative current, and the output of the second operational amplifier U2 is also low.
When the ON/OFF of the control unit 120 is high, the constant current unit 110 starts operating as long as one of the outputs of the two operational amplifiers of the fourth operational amplifier U4 and the second operational amplifier U2 is high, and both ends of the sixteenth resistor R16 are high.
When the ON/OFF state of the control unit 120 is a low level, the constant current unit 110 is turned OFF, and both ends of the sixteenth resistor R16 are a low level regardless of whether the fourth and second operational amplifiers U4 and U2 output positive voltages.
When the voltage across the sixteenth resistor R16 is at a high level, the output terminal of the driver chip U1 is also at a high level, the level G of the switch Q1 is also at a high level, and the switch Q1 is turned on. When the voltage across the sixteenth resistor R16 is low, the stage G of the switch Q1 is also low, and the switch Q1 is turned off.
To sum up, the utility model provides a pair of electronic load joins conversely protection circuit utilizes above-mentioned circuit framework can realize electronic load's the function of joining conversely when realizing that heavy current area carries.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An electronic load reverse connection protection circuit, comprising: the electronic load circuit and the load reverse connection protection circuit are connected;
the electronic load circuit is connected with the load reverse connection protection circuit;
the electronic load circuit includes:
the circuit comprises a first input interface, a second resistor, a constant current unit and a control unit;
the first input interface and the second input interface are respectively connected with the control unit and the constant current unit through the load reverse connection protection circuit;
one end of the second resistor is connected with the second input interface, and the other end of the second resistor is respectively connected with the load reverse connection protection circuit and the constant current unit;
the load reverse connection protection circuit comprises:
the differential circuit, the first receipt comparison circuit, the second receipt comparison circuit, the driving circuit and the switch circuit;
a first input end of the differential circuit is connected with the first input interface, a second input end of the differential circuit is connected with the second input interface, and an output end of the differential circuit is connected with a first input end of the first response comparison circuit;
a second input end of the first receipt comparison circuit is grounded, and an output end of the first receipt comparison circuit is respectively connected with an input end of the driving circuit and a control end of the control unit;
the output end of the second receipt comparison circuit is connected with the control end of the control unit, the first input end of the second receipt comparison circuit is connected between the second resistor and the constant current unit, and the second input end of the second receipt comparison circuit is grounded;
the output end of the driving circuit is connected with the control end of the switch circuit;
the first end of the switch circuit is connected with the second input interface, and the second end of the switch circuit is connected with the second resistor;
and the common joint of the second end of the switch circuit and the second resistor is grounded.
2. The reverse connection protection circuit for an electronic load according to claim 1, wherein the switching circuit comprises:
the circuit comprises a switching tube, a first capacitor and a first resistor;
the control end of the switching tube is connected with the output end of the driving circuit;
the second input interface and one end of the first capacitor are connected with the first end of the switch tube, the other end of the first capacitor is connected with one end of the first resistor in series, and the other end of the second resistor and the other end of the first resistor are connected with the second end of the switch tube.
3. The reverse connection protection circuit for an electronic load according to claim 2, wherein the driving circuit comprises:
the driving chip, the fifth resistor and the sixteenth resistor;
the input end of the driving chip is respectively connected with one end of the sixteenth resistor and the control end of the control unit;
the fifth resistor is arranged between the output end of the driving chip and the control end of the switch tube;
the other end of the sixteenth resistor is grounded.
4. The reverse connection protection circuit of claim 3, wherein the second response piece comparison circuit comprises:
the circuit comprises a second operational amplifier, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor and a second diode;
the first input end of the second operational amplifier is connected between the second resistor and the constant current unit through the third resistor;
the second input end of the second operational amplifier is connected with a power supply through the sixth resistor, and the second input end of the second operational amplifier is grounded through the seventh resistor;
one end of the fourth resistor is connected between the first input end of the second operational amplifier and the third resistor, and the other end of the fourth resistor is connected with the output end of the second operational amplifier;
the anode of the second diode is connected with the output end of the second operational amplifier, and the cathode of the second diode is connected with the output end of the first return comparison circuit.
5. The reverse connection protection circuit of claim 4, wherein the first loop back comparison circuit comprises:
a fourth operational amplifier, a ninth resistor, an eleventh resistor, a fourteenth resistor and a seventeenth resistor;
the output end of the fourth operational amplifier is respectively connected with the cathode of the second diode, the sixteenth resistor and the control end of the control unit;
one end of the ninth resistor is connected with the first input end of the fourth operational amplifier, and the other end of the ninth resistor is connected with the output end of the fourth operational amplifier;
the eleventh resistor is arranged between the first input end of the fourth operational amplifier and the output end of the differential circuit;
the second input end of the fourth operational amplifier is connected to a power supply through the fourteenth resistor, and the second input end of the fourth operational amplifier is grounded through the seventeenth resistor.
6. The reverse connection protection circuit for an electronic load according to claim 5, wherein the differential circuit comprises:
a third operational amplifier, an eighth resistor, a tenth resistor, a thirteenth resistor and a fifteenth resistor;
the output end of the third operational amplifier is connected with the eleventh resistor;
one end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the first input end of the third operational amplifier;
one end of the tenth resistor is connected with the first input interface, and the other end of the tenth resistor is connected with the first input end of the third operational amplifier;
one end of the thirteenth resistor is connected with the second input interface, and the other end of the thirteenth resistor is connected with the second input end of the third operational amplifier;
one end of the fifteenth resistor is connected with the second input end of the third operational amplifier, and the other end of the fifteenth resistor is connected with the output end of the third operational amplifier.
7. The reverse connection protection circuit for an electronic load according to claim 6, further comprising:
a third diode and a twelfth resistor;
the anode of the third diode is connected with the output end of the fourth operational amplifier;
the negative electrode of the third diode is connected with one end of the twelfth resistor;
the negative electrode of the second diode is connected between the negative electrode of the third diode and the twelfth resistor;
the other end of the twelfth resistor is connected with the sixteenth resistor and the control end of the control unit respectively.
8. The reverse connection protection circuit for an electronic load according to claim 7, further comprising a fourth diode;
the cathode of the fourth diode is connected with the control end of the control unit;
and the anode of the fourth diode is respectively connected with the twelfth resistor and the sixteenth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221058238.6U CN217445022U (en) | 2022-05-06 | 2022-05-06 | Electronic load reverse connection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221058238.6U CN217445022U (en) | 2022-05-06 | 2022-05-06 | Electronic load reverse connection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217445022U true CN217445022U (en) | 2022-09-16 |
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ID=83220688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221058238.6U Active CN217445022U (en) | 2022-05-06 | 2022-05-06 | Electronic load reverse connection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217445022U (en) |
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2022
- 2022-05-06 CN CN202221058238.6U patent/CN217445022U/en active Active
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