CN214798854U - Direct current bus overcurrent protection circuit - Google Patents
Direct current bus overcurrent protection circuit Download PDFInfo
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- CN214798854U CN214798854U CN202120223254.5U CN202120223254U CN214798854U CN 214798854 U CN214798854 U CN 214798854U CN 202120223254 U CN202120223254 U CN 202120223254U CN 214798854 U CN214798854 U CN 214798854U
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- energy storage
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Abstract
The utility model discloses a direct current bus overcurrent protection circuit is applied to the converter, include: the sampling module is used for sampling the direct current bus current; the overcurrent conducting module is used for being communicated with the sampling module when the bus is in overcurrent; the energy storage module is connected with the overcurrent conduction module and is used for storing electric energy generated by overcurrent of the bus; the signal trigger module is used for receiving the electric energy transmitted by the energy storage module, and when the electric energy exceeds the maximum electric energy which can be received by the signal trigger module, the signal trigger module sends a low-level signal; and the DSP module is used for receiving the low level signal and sending a blocking driving signal to the frequency converter, so that at least one defect in the background technology is overcome, and the user experience is excellent.
Description
Technical Field
The utility model relates to a converter protection technical field especially relates to a direct current generating line overcurrent protection circuit.
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.
In a frequency converter system, damage to an electrical insulation, a mechanical fault or overcurrent of a direct-current bus can cause the frequency converter to be damaged by the overcurrent, and the overcurrent fault is always the most common fault of the frequency converter and is also the most main reason for damaging the frequency converter. Output short circuit, winding damage, load locked-rotor, motor over-fast acceleration, switch device failure or misconduction caused by interference can all lead to converter overcurrent, so how to protect the converter from being damaged under the condition of overcurrent becomes a key.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current bus overcurrent protection circuit solves in the background art at least that one is not enough, and user experience feels splendid.
In order to achieve the above purpose, the technical scheme of the utility model has:
the utility model provides a direct current busbar overcurrent protection circuit, is applied to the converter, includes: the sampling module is used for sampling the direct current bus current; the overcurrent conducting module is used for being communicated with the sampling module when the bus is in overcurrent; the energy storage module is connected with the overcurrent conduction module and is used for storing electric energy generated by overcurrent of the bus; the signal trigger module is used for receiving the electric energy transmitted by the energy storage module, and when the electric energy exceeds the maximum electric energy which can be received by the signal trigger module, the signal trigger module sends a low-level signal; and the DSP module is used for receiving the low level signal and sending a blocking driving signal to the frequency converter.
Further, the sampling module comprises a resistor R1, a current input end and a capacitor C1, wherein the current input end is connected with the resistor R1 and the capacitor C1 which are connected in parallel.
Further, the resistor R1 is a high-precision resistor.
Further, the overcurrent conduction modules are arranged in two numbers, each overcurrent conduction module comprises a first overcurrent conduction module and a second overcurrent conduction module, and the first overcurrent conduction module and the second overcurrent conduction module are arranged in parallel.
Further, the first overcurrent conducting module comprises a triode Q1, the second overcurrent conducting module comprises a triode Q2, the first end of the triode Q1 is connected with the first end of the triode Q2, the second end of the triode Q1 and the second end of the triode Q2 are both connected with the sampling module, and the third end of the triode Q1 and the third end of the triode Q2 are both connected with the energy storage module.
Further, a resistor R2 is further disposed between the second end of the transistor Q1 and the sampling module.
Furthermore, the number of the energy storage modules is two, the energy storage modules comprise a first energy storage module and a second energy storage module, and the first energy storage module and the second energy storage module are mutually connected in parallel.
Further, the first energy storage module comprises a resistor R3 and a capacitor C2, the resistor R3 and the capacitor C2 are connected in parallel, then one end of the resistor R is connected with the overcurrent conducting module, the other end of the resistor R is connected with the signal triggering module, the second energy storage module comprises a resistor R4 and a capacitor C3, the resistor R4 and the capacitor C3 are connected in parallel, then one end of the resistor R is connected with the first energy storage module, and the other end of the resistor R is connected with the overcurrent conducting module.
Further, the signal trigger module comprises a triode Q3, a voltage regulator tube Z1, a resistor R5 and a photoelectric coupler PC1, a first end of the triode Q3 is connected with the voltage regulator tube Z1 and then connected with the energy storage module, a second end of the triode Q3 is connected with the energy storage module, and a third end of the triode Q3 is connected with the resistor R5 and then connected with the photoelectric coupler PC 1.
Further, a first end of the photoelectric coupler PC1 is connected with the sampling module; the second end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the third end of the triode Q3 after being connected with the resistor R5, and the other path is connected with the sampling module after being connected with the resistor R6; the third end of the photoelectric coupler PC1 is grounded; the fourth end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the resistor R7 and then connected with the +5V voltage, and the other path is connected with the DSP module.
The utility model discloses a direct current bus overcurrent protection circuit, its beneficial effect is: through mutual cooperation between the sampling module, the overcurrent conduction module, the energy storage module, the signal trigger module and the DSP module, when the current collected by the sampling module exceeds a preset value, the overcurrent conduction module can be conducted, so that the energy storage module starts to charge, when the electric energy exceeds the maximum electric energy which can be received by the signal trigger module, the signal trigger module sends a low level signal, and after the DSP module receives the low level signal, a blocking drive signal can be sent to the frequency converter, so that the frequency converter is protected from being damaged.
Drawings
FIG. 1 is a schematic diagram of a DC bus overcurrent protection circuit;
fig. 2 is a circuit diagram of a dc bus overcurrent protection circuit.
Detailed Description
The present invention is described with reference to the accompanying drawings.
As shown in fig. 1 to 2, as a preferred embodiment of the present invention:
the utility model provides a direct current busbar overcurrent protection circuit, is applied to the converter, includes: the sampling module 1 is used for sampling the direct current bus current; the overcurrent conduction module 2 is used for being communicated with the sampling module 1 when the bus is in overcurrent; the energy storage module 3 is connected with the overcurrent conduction module 2, and the energy storage module 3 is used for storing electric energy generated by overcurrent of the bus; the signal trigger module 4 is used for receiving the electric energy transmitted by the energy storage module 3, and when the electric energy exceeds the maximum electric energy which can be received by the signal trigger module 4, the signal trigger module 4 sends a low-level signal; and the DSP module is used for receiving the low level signal and sending a blocking driving signal to the frequency converter.
The sampling module 1 comprises a resistor R1, a current input end and a capacitor C1, wherein the current input end is connected with the resistor R1 and the capacitor C1 which are connected in parallel.
Preferably, the resistor R1 is a high-precision resistor, so that the resistance of the resistor R1 can be more accurate.
When the preset current value is set (when the preset value is exceeded, the overcurrent is obtained), different resistors R1 can be used, different preset values can be set through different resistance values, and most of use requirements can be met.
The overcurrent conduction module 2 is provided with two, the overcurrent conduction module 2 comprises a first overcurrent conduction module 2 and a second overcurrent conduction module 2, and the first overcurrent conduction module 2 and the second overcurrent conduction module 2 are connected in parallel.
Preferably, the first overcurrent conducting module 2 includes a transistor Q1, the second overcurrent conducting module 2 includes a transistor Q2, a first end of the transistor Q1 is connected to a first end of the transistor Q2, a second end of the transistor Q1 and a second end of the transistor Q2 are both connected to the sampling module 1, and a third end of the transistor Q1 and a third end of the transistor Q2 are both connected to the energy storage module 3.
Preferably, a resistor R2 is further disposed between the second end of the transistor Q1 and the sampling module 1.
When the current flowing through the circuit exceeds a preset value, the triode Q1 and the triode Q2 are conducted, so that the current flows through the Q1 and the Q2, the current flows to the energy storage module 3, and electric energy is generated in the energy storage module 3.
In order to match the two overcurrent conduction modules 2, the number of the energy storage modules 3 is two, each energy storage module 3 comprises a first energy storage module 3 and a second energy storage module 3, and the first energy storage module 3 and the second energy storage module 3 are connected in parallel.
Preferably, the first energy storage module 3 includes a resistor R3 and a capacitor C2, the resistor R3 and the capacitor C2 are connected in parallel, and then one end of the resistor R is connected to the overcurrent conduction module 2, and the other end of the resistor R is connected to the signal trigger module 4, the second energy storage module 3 includes a resistor R4 and a capacitor C3, the resistor R4 and the capacitor C3 are connected in parallel, then one end of the resistor R is connected to the first energy storage module 3, and the other end of the resistor R is connected to the overcurrent conduction module 2.
The triode Q1 and the triode Q2 correspond to the energy storage module 3 respectively, the capacitor C2 and the capacitor C3 are charged through current flowing in the overcurrent conduction module 2, at the moment, the voltage of the first energy storage module 3 and the voltage of the second energy storage module 3 continuously rise, and finally the signal is triggered to trigger the module 4, so that the low level signal is sent to the DSP module, and after the DSP module receives the low level signal, a blocking driving signal is sent to the frequency converter, so that the frequency converter is protected from being damaged.
The signal trigger module 4 comprises a triode Q3, a voltage regulator tube Z1, a resistor R5 and a photoelectric coupler PC1, wherein the first end of the triode Q3 is connected with the voltage regulator tube Z1 and then connected with the energy storage module 3, the second end of the triode Q3 is connected with the energy storage module 3, and the third end of the triode Q3 is connected with the resistor R5 and then connected with the photoelectric coupler PC 1.
Preferably, a first end of the photoelectric coupler PC1 is connected with the sampling module 1; the second end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the third end of the triode Q3 after being connected with the resistor R5, and the other path is connected with the sampling module 1 after being connected with the resistor R6; the third end of the photoelectric coupler PC1 is grounded; the fourth end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the resistor R7 and then connected with the +5V voltage, and the other path is connected with the DSP module.
The utility model discloses a direct current bus overcurrent protection circuit, its beneficial effect is: through the mutual cooperation between sampling module 1, the module 2 that switches on overflows, energy storage module 3, signal trigger module 4 and the DSP module, when the electric current that sampling module 1 gathered surpassed the default, the module 2 that switches on overflows can switch on to make energy storage module 3 begin to charge, when the electric energy surpassed the biggest electric energy that signal trigger module 4 can receive, signal trigger module 4 sends low level signal, receives as the DSP module behind the low level signal, can to the converter sends blockade drive signal, thereby the protection converter is not destroyed.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a direct current bus overcurrent protection circuit, is applied to the converter, its characterized in that includes:
the sampling module is used for sampling the direct current bus current;
the overcurrent conducting module is used for being communicated with the sampling module when the bus is in overcurrent;
the energy storage module is connected with the overcurrent conduction module and is used for storing electric energy generated by overcurrent of the bus;
the signal trigger module is used for receiving the electric energy transmitted by the energy storage module, and when the electric energy exceeds the maximum electric energy which can be received by the signal trigger module, the signal trigger module sends a low-level signal;
and the DSP module is used for receiving the low level signal and sending a blocking driving signal to the frequency converter.
2. The direct current bus overcurrent protection circuit of claim 1, wherein the sampling module comprises a resistor R1, a current input end and a capacitor C1, and the current input end is connected with the resistor R1 and the capacitor C1 after being connected in parallel.
3. The direct current bus overcurrent protection circuit of claim 2, wherein the resistor R1 is a high-precision resistor.
4. The direct current bus overcurrent protection circuit of claim 1, wherein there are two overcurrent conduction modules, and the overcurrent conduction modules include a first overcurrent conduction module and a second overcurrent conduction module, and the first overcurrent conduction module and the second overcurrent conduction module are connected in parallel with each other.
5. The direct current bus overcurrent protection circuit of claim 4, wherein the first overcurrent conducting module comprises a transistor Q1, the second overcurrent conducting module comprises a transistor Q2, a first end of the transistor Q1 is connected to a first end of the transistor Q2, a second end of the transistor Q1 and a second end of the transistor Q2 are both connected to the sampling module, and a third end of the transistor Q1 and a third end of the transistor Q2 are both connected to the energy storage module.
6. The direct current bus overcurrent protection circuit of claim 5, wherein a resistor R2 is further provided between the second end of the transistor Q1 and the sampling module.
7. The direct current bus overcurrent protection circuit of claim 1, wherein there are two energy storage modules, and the energy storage modules include a first energy storage module and a second energy storage module, and the first energy storage module and the second energy storage module are arranged in parallel with each other.
8. The direct current bus overcurrent protection circuit of claim 7, wherein the first energy storage module comprises a resistor R3 and a capacitor C2, the resistor R3 and the capacitor C2 are connected in parallel, one end of the resistor R is connected with the overcurrent conducting module, the other end of the resistor R is connected with the signal triggering module, the second energy storage module comprises a resistor R4 and a capacitor C3, the resistor R4 and the capacitor C3 are connected in parallel, one end of the resistor R is connected with the first energy storage module, and the other end of the resistor R is connected with the overcurrent conducting module.
9. The direct current bus overcurrent protection circuit of claim 1, wherein the signal trigger module comprises a triode Q3, a voltage regulator tube Z1, a resistor R5 and a photoelectric coupler PC1, a first end of the triode Q3 is connected with the voltage regulator tube Z1 and then connected with the energy storage module, a second end of the triode Q3 is connected with the energy storage module, and a third end of the triode Q3 is connected with the resistor R5 and then connected with the photoelectric coupler PC 1.
10. The direct current bus overcurrent protection circuit of claim 9, wherein a first end of the photoelectric coupler PC1 is connected to the sampling module; the second end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the third end of the triode Q3 after being connected with the resistor R5, and the other path is connected with the sampling module after being connected with the resistor R6; the third end of the photoelectric coupler PC1 is grounded; the fourth end of the photoelectric coupler PC1 is divided into two paths, one path is connected with the resistor R7 and then connected with the +5V voltage, and the other path is connected with the DSP module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120223254.5U CN214798854U (en) | 2021-01-27 | 2021-01-27 | Direct current bus overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120223254.5U CN214798854U (en) | 2021-01-27 | 2021-01-27 | Direct current bus overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214798854U true CN214798854U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120223254.5U Active CN214798854U (en) | 2021-01-27 | 2021-01-27 | Direct current bus overcurrent protection circuit |
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|---|---|
| CN (1) | CN214798854U (en) |
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2021
- 2021-01-27 CN CN202120223254.5U patent/CN214798854U/en active Active
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