CN215728492U - Load circuit for frequency converter maintenance test - Google Patents
Load circuit for frequency converter maintenance test Download PDFInfo
- Publication number
- CN215728492U CN215728492U CN202121579034.2U CN202121579034U CN215728492U CN 215728492 U CN215728492 U CN 215728492U CN 202121579034 U CN202121579034 U CN 202121579034U CN 215728492 U CN215728492 U CN 215728492U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- capacitor
- pin
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a load circuit for a frequency converter maintenance test, which comprises a load, wherein the load comprises an inductor L and a resistor R1, the output end of the load is electrically connected with the input end of an amplifying circuit, the output end of the amplifying circuit is electrically connected with the input end of a rectifying filter circuit, the output end of the rectifying filter circuit is respectively electrically connected with the input end of a broken circuit detection circuit and the input end of a short circuit detection circuit, the output end of the broken circuit detection circuit and the output end of the short circuit detection circuit are respectively electrically connected with the input end of a short circuit protection circuit, and the output end of the short circuit protection circuit is electrically connected with the input end of a warning circuit. Has the advantages that: the short-circuit protection circuit comprises a short-circuit protection circuit, a short-circuit detection circuit and a short-circuit detection circuit, wherein the short-circuit protection circuit is connected with the short-circuit detection circuit through a short-circuit protection circuit, and the short-circuit detection circuit is connected with the short-circuit protection circuit through a short-circuit detection circuit.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a load circuit for a frequency converter maintenance test.
Background
The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. The frequency converter is one of indispensable important devices for speed regulation control and energy conservation of modern motors, and is widely applied in the industrial field.
At present, in the process of developing a frequency converter, the frequency converter must be subjected to function test so as to ensure that the frequency converter can be normally used after leaving a factory, and a load circuit is required to be used in the processes of maintaining and testing the frequency converter. However, the conventional load circuit generally lacks a short-circuit protection function, and when a large current multiple is suddenly encountered during maintenance or testing, especially when a load short circuit or a bridge arm through fault occurs, a high voltage spike is induced in a loop stray inductance due to a large di/dt in an instantaneous gate turn-off pulse, so that the IGBT is damaged.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the utility model provides a load circuit for a frequency converter maintenance test, which has the advantages of detecting faults and protecting the circuit, thereby solving the problems in the background art.
(II) technical scheme
In order to realize the advantages of detecting faults and protecting circuits, the utility model adopts the following specific technical scheme:
the utility model provides a load circuit is used in converter maintenance test, including the load, the load includes inductance L and resistance R1, the output of load is connected with amplifier circuit's input electricity, amplifier circuit's output is connected with rectifier filter circuit's input electricity, rectifier filter circuit's output is connected with the input electricity of detection circuit and short-circuit detection circuit that opens circuit respectively, the output of detection circuit and the output of short-circuit detection circuit that opens circuit are connected with short-circuit protection circuit's input electricity respectively, short-circuit protection circuit's output is connected with warning circuit's input electricity.
Further, the amplifying circuit comprises an operational amplifier LM318, a capacitor C1, a resistor R2, a resistor R3 and a resistor R4, wherein a first pin of the operational amplifier LM318 is connected with one side of the resistor R2 and one side of the resistor R4 respectively, the other side of the resistor R2 is connected with one side of the resistor R1, a second pin of the operational amplifier LM318 is connected with one side of the resistor R3, the other side of the resistor R3 is grounded, a third pin and a fourth pin of the operational amplifier LM318 are connected with the negative pole and the positive pole of a power supply respectively, and a fifth pin of the operational amplifier LM318 is connected with the other side of the resistor R4 and one side of the capacitor C1 respectively.
Further, the rectifying and filtering circuit comprises a diode D1, a resistor R5 and a capacitor C2, wherein the anode of the diode D1 is connected with the other side of the capacitor C1, the cathode of the diode D1 is respectively connected with one side of the resistor R5 and one side of the capacitor C2, and the other side of the resistor R5 is respectively connected with one side of the resistor R3 and the other side of the capacitor C2.
Furthermore, the open circuit detection circuit comprises an optical coupler U31, a capacitor C3, a resistor R6 and a resistor R7, a first pin of the optical coupler U31 is connected with one side of the resistor R6, the other side of the resistor R6 is connected with one side of the capacitor C2, one side of the resistor R5 and the negative electrode of the diode D1, a second pin of the optical coupler U31 is connected with the other side of the capacitor C2, the other side of the resistor R5, one side of the resistor R3 and a strong current common end PGND, a third pin of the optical coupler U31 is connected with one side of the capacitor C3 and grounded, and a fourth pin of the optical coupler U31 is connected with one side of the resistor R7 and the other side of the capacitor C3.
Further, the short circuit detection circuit comprises an optical coupler U41, a diode D2, a capacitor C4, a resistor R8 and a resistor R9, a first pin of the optical coupler U41 is connected with one side of a resistor R8, the other side of the resistor R8 is connected with an anode of the diode D2, a cathode of the diode D2 is connected with one side of the resistor R6, one side of the capacitor C2, one side of the resistor R5 and a cathode of the diode D1 respectively, a second pin of the optical coupler U41 is connected with a second pin of the optical coupler U31, the other side of the capacitor C2, the other side of the resistor R5 and one side of the resistor R3 respectively, a third pin of the optical coupler U41 is connected with one side of the capacitor C4 and grounded, and a fourth pin of the optical coupler U41 is connected with one side of the resistor R9 and the other side of the capacitor C4 respectively.
Further, the short-circuit protection circuit comprises a triode Q1, a triode Q2, a resistor R10, a resistor R11, a resistor R12, a capacitor C5 and a capacitor C6, wherein an emitter of the triode Q1 is connected with one side of the capacitor C4, one side of the capacitor C5, one side of the capacitor C6 and an emitter of the triode Q2, a base of the triode Q1 is connected with the other side of the capacitor C5 and one side of the resistor R11, a collector of the triode Q1 is connected with one side of the resistor R10, the other side of the capacitor C6 and a base of the triode Q2, the other side of the resistor R10 is grounded, a collector of the triode Q2 is connected with the other side of the resistor R11 and one side of the resistor R12, and the other side of the resistor R12 is grounded.
Further, the warning circuit comprises a triode Q3, a diode D3, a resistor R13, a resistor R14 and a speaker SP, wherein a base of the triode Q3 is connected with one side of the resistor R14, the other side of the resistor R14 is respectively connected with one side of the resistor R13, one side of the resistor R12, the other side of the resistor R11 and a collector of the triode Q2, the other side of the resistor R13 is connected with an anode of the diode D3, a cathode of the diode D3 is grounded, an emitter of the triode Q3 is grounded, and a collector of the triode Q3 is connected with the speaker SP.
(III) advantageous effects
Compared with the prior art, the utility model provides a load circuit for the maintenance test of a frequency converter, which has the following beneficial effects:
(1) the open circuit detection circuit, the short circuit detection circuit and the short circuit protection circuit are arranged, so that the open circuit and short circuit faults of the frequency converter can be effectively detected, the service life of internal key components is prolonged, and a good short circuit protection effect can be achieved when a load short circuit or bridge arm direct connection fault occurs.
(2) The output signal can be effectively amplified by the amplifying circuit, so that the signal is amplified to a level required by a subsequent circuit, and sufficient gain is achieved; through being provided with warning circuit, can play in time to remind the user to discover unusual effect.
(3) Through being provided with the rectifier filter circuit to make it can carry out fine the getting rid of with the clutter, thereby make it can obtain the wavelength signal that wants, thereby avoided the unnecessary influence of clutter to its production effectively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic block diagram of a load circuit for a frequency converter maintenance test according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a load circuit for a frequency converter maintenance test according to an embodiment of the utility model.
In the figure:
1. a load; 2. an amplifying circuit; 3. a rectification filter circuit; 4. a disconnection detection circuit; 5. a short circuit detection circuit; 6. a short-circuit protection circuit; 7. an alarm circuit.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the utility model, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.
According to the embodiment of the utility model, the load circuit for the frequency converter maintenance test is provided.
Referring to the drawings and the detailed description, as shown in fig. 1-2, an embodiment of the present invention includes a load 1, the load 1 includes an inductor L and a resistor R1, an output terminal of the load 1 is electrically connected to an input terminal of an amplifying circuit 2, an output terminal of the amplifying circuit 2 is electrically connected to an input terminal of a rectifying and filtering circuit 3, an output terminal of the rectifying and filtering circuit 3 is electrically connected to an input terminal of an open circuit detecting circuit 4 and an input terminal of a short circuit detecting circuit 5, an output terminal of the open circuit detecting circuit 4 and an output terminal of the short circuit detecting circuit 5 are electrically connected to an input terminal of a short circuit protecting circuit 6, and an output terminal of the short circuit protecting circuit 6 is electrically connected to an input terminal of a warning circuit 7.
In one embodiment, the amplifying circuit 2 includes an operational amplifier LM318, a capacitor C1, a resistor R2, a resistor R3, and a resistor R4, wherein a first pin of the operational amplifier LM318 is connected to one side of the resistor R2 and one side of the resistor R4, respectively, the other side of the resistor R2 is connected to one side of the resistor R1, a second pin of the operational amplifier LM318 is connected to one side of the resistor R3, the other side of the resistor R3 is grounded, a third pin and a fourth pin of the operational amplifier LM318 are connected to a cathode and an anode of a power supply, respectively, and a fifth pin of the operational amplifier LM318 is connected to the other side of the resistor R4 and one side of the capacitor C1, respectively.
In one embodiment, the rectifying and filtering circuit 3 includes a diode D1, a resistor R5, and a capacitor C2, wherein an anode of the diode D1 is connected to the other side of the capacitor C1, a cathode of the diode D1 is connected to one side of the resistor R5 and one side of the capacitor C2, respectively, and the other side of the resistor R5 is connected to one side of the resistor R3 and the other side of the capacitor C2, respectively.
In one embodiment, the disconnection detecting circuit 4 includes an optical coupler U31, a capacitor C3, a resistor R6, and a resistor R7, a first pin of the optical coupler U31 is connected to one side of the resistor R6, the other side of the resistor R6 is connected to one side of the capacitor C2, one side of the resistor R5, and a negative electrode of the diode D1, a second pin of the optical coupler U31 is connected to the other side of the capacitor C2, the other side of the resistor R5, one side of the resistor R3, and a strong current common terminal PGND, a third pin of the optical coupler U31 is connected to one side of the capacitor C3 and grounded, and a fourth pin of the optical coupler U31 is connected to one side of the resistor R7 and the other side of the capacitor C3.
In one embodiment, the short circuit detection circuit 5 includes an optical coupler U41, a diode D2, a capacitor C4, a resistor R8, and a resistor R9, a first pin of the optical coupler U41 is connected to one side of the resistor R8, the other side of the resistor R8 is connected to an anode of the diode D2, a cathode of the diode D2 is connected to one side of the resistor R6, one side of the capacitor C2, one side of the resistor R5, and a cathode of the diode D1, a second pin of the optical coupler U41 is connected to a second pin of the optical coupler U31, the other side of the capacitor C2, the other side of the resistor R5, and one side of the resistor R3, a third pin of the optical coupler U41 is connected to one side of the capacitor C4 and grounded, and a fourth pin of the optical coupler U41 is connected to one side of the resistor R9 and the other side of the capacitor C4.
In one embodiment, the short-circuit protection circuit 6 includes a transistor Q1, a transistor Q2, a resistor R10, a resistor R11, a resistor R12, a capacitor C5, and a capacitor C6, wherein an emitter of the transistor Q1 is connected to one side of the capacitor C4, one side of the capacitor C5, one side of the capacitor C6, and an emitter of the transistor Q2, a base of the transistor Q1 is connected to the other side of the capacitor C5 and one side of the resistor R11, a collector of the transistor Q1 is connected to one side of the resistor R10, the other side of the capacitor C6, and a base of the transistor Q2, the other side of the resistor R10 is grounded, a collector of the transistor Q2 is connected to the other side of the resistor R11 and one side of the resistor R12, and the other side of the resistor R12 is grounded.
In one embodiment, the warning circuit 7 includes a transistor Q3, a diode D3, a resistor R13, a resistor R14, and a speaker SP, wherein a base of the transistor Q3 is connected to one side of the resistor R14, another side of the resistor R14 is connected to one side of the resistor R13, one side of the resistor R12, another side of the resistor R11, and a collector of the transistor Q2, another side of the resistor R13 is connected to an anode of the diode D3, a cathode of the diode D3 is grounded, an emitter of the transistor Q3 is grounded, and a collector of the transistor Q3 is connected to the speaker SP.
In summary, by means of the above technical scheme of the present invention, through the arrangement of the open circuit detection circuit, the short circuit detection circuit and the short circuit protection circuit, not only can open circuit and short circuit faults occurring in the frequency converter be effectively detected, and the service life of internal key components be prolonged, but also a good short circuit protection effect can be achieved when a load short circuit or a bridge arm through fault occurs.
In addition, the amplifying circuit is arranged, so that the output signal can be effectively amplified, the signal is amplified to a level required by a subsequent circuit, and sufficient gain is achieved; through being provided with warning circuit, can play in time to remind the user to discover unusual effect.
In addition, the rectifying and filtering circuit is arranged, so that the noise can be well removed, a desired wavelength signal can be obtained, and unnecessary influence on the noise can be effectively avoided.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a load circuit is used in converter maintenance test, includes load (1), and this load (1) includes inductance L and resistance R1, its characterized in that, the output of load (1) is connected with amplifier circuit (2)'s input electricity, amplifier circuit (2)'s output is connected with rectifier filter circuit (3)'s input electricity, rectifier filter circuit (3)'s output respectively with the input of detection circuit (4) and the input electricity of short-circuit detection circuit (5) that open circuit, the output of detection circuit (4) and the output of short-circuit detection circuit (5) are connected with the input electricity of short-circuit protection circuit (6) respectively, the output of short-circuit protection circuit (6) is connected with the input electricity of warning circuit (7).
2. The load circuit according to claim 1, wherein the amplifying circuit (2) comprises an operational amplifier LM318, a capacitor C1, a resistor R2, a resistor R3 and a resistor R4, a first pin of the operational amplifier LM318 is connected to one sides of the resistor R2 and the resistor R4, respectively, the other side of the resistor R2 is connected to one side of the resistor R1, a second pin of the operational amplifier LM318 is connected to one side of the resistor R3, the other side of the resistor R3 is grounded, a third pin and a fourth pin of the operational amplifier LM318 are connected to a negative electrode and a positive electrode of a power supply, respectively, and a fifth pin of the operational amplifier LM318 is connected to the other side of the resistor R4 and one side of the capacitor C1, respectively.
3. The load circuit for the frequency converter maintenance test according to claim 2, wherein the rectifying and filtering circuit (3) comprises a diode D1, a resistor R5 and a capacitor C2, the anode of the diode D1 is connected with the other side of the capacitor C1, the cathode of the diode D1 is connected with one side of the resistor R5 and one side of the capacitor C2, respectively, and the other side of the resistor R5 is connected with one side of the resistor R3 and the other side of the capacitor C2, respectively.
4. The load circuit for the frequency converter maintenance test according to claim 3, wherein the open circuit detection circuit (4) comprises an optocoupler U31, a capacitor C3, a resistor R6 and a resistor R7, a first pin of the optocoupler U31 is connected with one side of the resistor R6, the other side of the resistor R6 is connected with one side of the capacitor C2, one side of the resistor R5 and a negative electrode of the diode D1, a second pin of the optocoupler U31 is connected with the other side of the capacitor C2, the other side of the resistor R5, one side of the resistor R3 and a strong current common end PGND, a third pin of the optocoupler U31 is connected with one side of the capacitor C3 and grounded, and a fourth pin of the optocoupler U31 is connected with one side of the resistor R7 and the other side of the capacitor C3.
5. The load circuit for frequency converter maintenance testing of claim 4, the short circuit detection circuit (5) comprises an optocoupler U41, a diode D2, a capacitor C4, a resistor R8 and a resistor R9, a first pin of the optocoupler U41 is connected with one side of the resistor R8, the other side of the resistor R8 is connected with the anode of the diode D2, the cathode of the diode D2 is connected to one side of the resistor R6, one side of the capacitor C2, one side of the resistor R5 and the cathode of the diode D1, a second pin of the optical coupler U41 is respectively connected with a second pin of the optical coupler U31, the other side of the capacitor C2, the other side of the resistor R5 and one side of the resistor R3, the third pin of the optical coupler U41 is connected with one side of the capacitor C4 and grounded, and the fourth pin of the optical coupler U41 is connected with one side of the resistor R9 and the other side of the capacitor C4 respectively.
6. The load circuit for frequency converter maintenance testing of claim 5, the short-circuit protection circuit (6) comprises a triode Q1, a triode Q2, a resistor R10, a resistor R11, a resistor R12, a capacitor C5 and a capacitor C6, the emitter of the transistor Q1 is respectively connected with one side of the capacitor C4, one side of the capacitor C5, one side of the capacitor C6 and the emitter of the transistor Q2, the base of the transistor Q1 is connected to the other side of the capacitor C5 and one side of the resistor R11, the collector of the transistor Q1 is respectively connected with one side of the resistor R10, the other side of the capacitor C6 and the base of the transistor Q2, the other side of the resistor R10 is grounded, the collector of the triode Q2 is respectively connected with the other side of the resistor R11 and one side of the resistor R12, and the other side of the resistor R12 is grounded.
7. The load circuit for the frequency converter maintenance test according to claim 6, wherein the warning circuit (7) comprises a transistor Q3, a diode D3, a resistor R13, a resistor R14 and a speaker SP, a base of the transistor Q3 is connected with one side of the resistor R14, the other side of the resistor R14 is connected with one side of the resistor R13, one side of the resistor R12, the other side of the resistor R11 and a collector of the transistor Q2, the other side of the resistor R13 is connected with an anode of the diode D3, a cathode of the diode D3 is grounded, an emitter of the transistor Q3 is grounded, and a collector of the transistor Q3 is connected with the speaker SP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121579034.2U CN215728492U (en) | 2021-07-13 | 2021-07-13 | Load circuit for frequency converter maintenance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121579034.2U CN215728492U (en) | 2021-07-13 | 2021-07-13 | Load circuit for frequency converter maintenance test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215728492U true CN215728492U (en) | 2022-02-01 |
Family
ID=80048655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121579034.2U Active CN215728492U (en) | 2021-07-13 | 2021-07-13 | Load circuit for frequency converter maintenance test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215728492U (en) |
-
2021
- 2021-07-13 CN CN202121579034.2U patent/CN215728492U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110379676B (en) | Vehicle-mounted relay energy-saving control circuit with voltage protection | |
| CN208589920U (en) | A kind of isolated form Wide-range voltage-stabilised power source circuit | |
| CN215728492U (en) | Load circuit for frequency converter maintenance test | |
| CN201113788Y (en) | Electric power protective circuit | |
| CN220234179U (en) | Overcurrent protection circuit | |
| CN217063266U (en) | Current backflow prevention circuit applied to battery detection equipment | |
| CN216981780U (en) | High-reliability inverter short-circuit protection circuit | |
| CN212305282U (en) | IGBT over-current protection circuit and device | |
| CN206481243U (en) | A kind of switch reluctance machine drive silicon controlled control circuit | |
| CN201438681U (en) | Intelligent controller for solar power supplies | |
| CN212784820U (en) | Storage battery power supply optimization control system for suspension type monorail vehicle | |
| CN207801885U (en) | The driving detection device and electric discharge device of electric discharge metal-oxide-semiconductor | |
| CN203352433U (en) | Full-bridge LLC conversion circuit | |
| CN205583660U (en) | Output current foldback circuit of converter | |
| CN208063051U (en) | A kind of Switching Power Supply of photovoltaic DC-to-AC converter | |
| CN211959086U (en) | PWM drive circuit | |
| CN215580895U (en) | Power output overshoot improvement circuit | |
| CN213342174U (en) | Circuit for overcurrent detection and protection of IGBT | |
| CN218940721U (en) | BMS power consumption indicating circuit | |
| CN221227521U (en) | Silicon carbide AC/DC contactless relay | |
| CN217693065U (en) | Realize high-power IBGT drive isolation circuit | |
| CN218241697U (en) | 35kV intelligent phase selection vacuum circuit breaker | |
| CN220085009U (en) | Magnetic latching relay disconnection delay detection system based on voltage change rate | |
| CN220273913U (en) | MOS tube short-circuit protection circuit | |
| CN113489317B (en) | Program-controlled output power control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |