CN205389102U - Variable frequency power supply output current -limiting current foldback circuit - Google Patents
Variable frequency power supply output current -limiting current foldback circuit Download PDFInfo
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- CN205389102U CN205389102U CN201620220503.4U CN201620220503U CN205389102U CN 205389102 U CN205389102 U CN 205389102U CN 201620220503 U CN201620220503 U CN 201620220503U CN 205389102 U CN205389102 U CN 205389102U
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Abstract
The utility model discloses a variable frequency power supply output current -limiting current foldback circuit, include: arrival current treatment circuit (1), the transform is handled for voltage signal through the rectifying and wave -filtering to the current signal that will be gathered by current transformer, limit current protection circuit (2) carries out the comparison with the corresponding value and the current -limiting setting value of the current signal gained, is limit current protection signal, over -current protection circuit (3), with the corresponding value of the current signal gained with overflow the setting value and carry out the comparison, obtain the over -current protection signal behind delay. The utility model discloses a current -limiting overflows two tunnel safeguard measures, and the protection mode of processing of two kinds of differences, and fundamentally has stopped the above -mentioned area of the variable frequency power supply problem of carrying, better protective power supply and load.
Description
Technical field
This utility model relates to a kind of variable-frequency power sources output current limiting current foldback circuit.
Background technology
The output overcurrent protection measure of current variable-frequency power sources is, when exporting electric current beyond current setting value or power supply output maximum, variable-frequency power sources stops output, plays the effect of protection power supply and load.
Owing to load is unlikely to be pure resistance characteristic, real load shows as perception, capacitive, rectification or Combination, and is greatly influenced by temperature, and the dash current that load powers up moment is very big, commonly reaches 7～10 times of rated current.Variable-frequency power sources is serious test by this, the numerous protection phenomenon of band carrier frequency occurs, or cannot normal band load situation.
Utility model content
For solving above-mentioned technical problem, this utility model provides a kind of variable-frequency power sources output current limiting current foldback circuit, it is provided that the protective measure that variable-frequency power sources output current limiting is two kinds different with crossing stream.
To achieve these goals, this utility model adopts the following technical scheme that.
Variable-frequency power sources output current limiting current foldback circuit, including such as lower component.
Input current processes circuit, and the current signal that will be collected by current transformer, rectified Filtering Processing is transformed to voltage signal.
Threshold currents protection circuit, compares the respective value of the current signal of acquirement and current limliting setting value, obtains threshold currents protection signal.
Circuit overcurrent protection, compares the respective value of the current signal of acquirement with crossing stream setting value, obtains overcurrent protection signal after time delay.
It is the current signal that will be collected by current transformer that input current processes circuit, and rectified filtering etc. processes and is transformed to required voltage signal.Input current processes circuit and includes transformer T1, rectifier bridge B1, resistance R1, resistance R2, resistance R3, diode D1, diode D2, electric capacity C1 and potentiometer VR1.The two ends of current transformer T1 secondary coil are connected with 1 foot of rectifier bridge B1 and 3 feet respectively；2 feet of rectifier bridge B1 are connected with the positive pole of one end of resistance R1 and diode D1；4 feet of rectifier bridge B1 and the other end of resistance R1, one end of electric capacity C1, potentiometer VR1 one end be connected and connect power supply ground；The negative pole of diode D1 is connected with one end of resistance R2；The other end of resistance R2 and the other end of electric capacity C1, the positive pole of diode D2, resistance R3 one end be connected；The other end of resistance R3 is connected with the other end of potentiometer VR1；The negative pole of diode D2 meets the positive 12V of power supply.
The function of threshold currents protection circuit is the respective value of the current signal of acquirement and current limliting setting value to be compared, and obtains threshold currents protection signal；Process through late-class circuit, reach the purpose of output current limiting.Threshold currents protection circuit includes comparator U2, resistance R6, resistance R7, resistance R8, resistance R9 and electric capacity C4.6 feet of comparator U2 connect current input signal；7 feet of comparator U2 are connected with each one end of resistance R6, resistance R7；The positive 6V of another termination power of resistance R6；1 foot of comparator U2 is connected with one end of the resistance R7 other end, resistance R8；The other end of resistance R8 is connected with resistance R9 one end, electric capacity C4 one end, as threshold currents output signal end；Another termination power ground of the positive 12V of another termination power of resistance R9, electric capacity C4.
The function of circuit overcurrent protection is the respective value of the current signal of acquirement to be compared with crossing stream setting value, obtains overcurrent protection signal after the delay of certain time；Process through late-class circuit, control variable-frequency power sources and stop output, reach the purpose of protection power supply.Circuit overcurrent protection includes comparator U2, resistance R4, resistance R5, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, electric capacity C2, electric capacity C3, electric capacity C5 and diode D3.5 feet of comparator U2 connect current input signal；4 feet of U2 connect the positive 6V signal of power supply；3 feet of U2 meet the positive 12V of power supply, and 12 feet connect power supply ground；Electric capacity C2 also connects between power supply 12V；The common port of the 2 foot connecting resistance R4 and diode D3 of comparator U2；The positive 12V of another termination power of resistance R4；The negative pole connecting resistance R5 of diode D3, electric capacity C3 common port, and be connected with 8 feet of U2, resistance R5, electric capacity C3 another public termination power ground；The 9 foot connecting resistance R10 of U2, resistance R11, resistance R12 common port, the positive 12V of another termination power of resistance R10, another termination power of resistance R11 ground；The 14 foot connecting resistance R12 of U2, each one end of resistance R13；The other end of resistance R13 is connected with resistance R14 one end, electric capacity C5 one end, as overcurrent output signal end；Another termination power ground of the positive 12V of another termination power of resistance R14, electric capacity C5.
Variable-frequency power sources output current value, after current transformer is sampled, carries out rectifying and wave-filtering and obtains suitable DC voltage；Voltage signal is divided into two-way, when one road signal reaches the less setting current value of correspondence, output signal (ZS) Pulse by Pulse controls to make output electric current not be further added by within the specific limits, decline accordingly according to load output voltage, reach the purpose of output current limiting, so solve load and power up the problem that moment impact electric current is excessive；Another road signal is after the delay of certain time; when still reaching relatively larger protection setting current threshold; illustrate load-carrying rated current too greatly beyond the load-bearing capacity of power supply, output signal (GL) controls variable-frequency power sources and stops output, reaches the purpose of protection power supply.
The beneficial effects of the utility model are, adopt current limliting to cross stream two-way protective measure and protection processing mode two kinds different, have fundamentally stopped the above-mentioned band load problem of variable-frequency power sources, better protection power supply and load.
Certainly, implement arbitrary product of the present utility model to it is not absolutely required to reach all the above advantage simultaneously.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation.
Fig. 2 is that input current processes electrical block diagram.
Fig. 3 is threshold currents protection electrical block diagram.
Fig. 4 is circuit overcurrent protection structural representation.
Wherein, 1, input current processes circuit；2, threshold currents protection circuit；3, circuit overcurrent protection.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is further illustrated.
As it is shown in figure 1, the variable-frequency power sources output current limiting current foldback circuit of the present embodiment, including such as lower component.
Input current processes circuit 1, and the current signal that will be collected by current transformer, rectified Filtering Processing is transformed to voltage signal.
Threshold currents protection circuit 2, compares the respective value of the current signal of acquirement and current limliting setting value, obtains threshold currents protection signal；Process through late-class circuit, reach the purpose of output current limiting.
Circuit overcurrent protection 3, compares the respective value of the current signal of acquirement with crossing stream setting value, obtains overcurrent protection signal after time delay；Process through late-class circuit, control variable-frequency power sources and stop output, reach the purpose of protection power supply.
It is the current signal that will be collected by current transformer that input current processes circuit 1, and rectified filtering etc. processes and is transformed to required voltage signal.
As in figure 2 it is shown, input current processes circuit 1 includes transformer T1, rectifier bridge B1, resistance R1, resistance R2, resistance R3, diode D1, diode D2, electric capacity C1 and potentiometer VR1.The two ends of current transformer T1 secondary coil are connected with 1 foot of rectifier bridge B1 and 3 feet respectively；2 feet of rectifier bridge B1 are connected with the positive pole of one end of resistance R1 and diode D1；4 feet of rectifier bridge B1 and the other end of resistance R1, one end of electric capacity C1, potentiometer VR1 one end be connected and connect power supply ground；The negative pole of diode D1 is connected with one end of resistance R2；The other end of resistance R2 and the other end of electric capacity C1, the positive pole of diode D2, resistance R3 one end be connected；The other end of resistance R3 is connected with the other end of potentiometer VR1；The negative pole of diode D2 meets the positive 12V of power supply.
As it is shown on figure 3, the function of threshold currents protection circuit 2 is the respective value of the current signal of acquirement and current limliting setting value to be compared, obtain threshold currents protection signal；Process through late-class circuit, reach the purpose of output current limiting.
Threshold currents protection circuit 2 includes the unit B U2B of comparator U2, resistance R6, resistance R7, resistance R8, resistance R9 and electric capacity C4.6 feet of comparator U2 connect current input signal；7 feet of comparator U2 are connected with each one end of resistance R6, R7；The positive 6V of another termination power of resistance R6；1 foot of comparator U2 is connected with each one end of resistance R7, R8；The other end of resistance R8 is connected with resistance R9 one end, electric capacity C4 one end, as threshold currents output signal end；Another termination power ground of the positive 12V of another termination power of resistance R9, electric capacity C4.
As shown in Figure 4, the function of circuit overcurrent protection 3 is the respective value of the current signal of acquirement to be compared with crossing stream setting value, obtains overcurrent protection signal after the delay of certain time；Process through late-class circuit, control variable-frequency power sources and stop output, reach the purpose of protection power supply.
Circuit overcurrent protection 3 includes the A unit U2A of comparator U2, the C cell U2C of comparator U2, resistance R4, resistance R5, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, electric capacity C2, electric capacity C3, electric capacity C5 and diode D3.5 feet of comparator U2 connect current input signal；4 feet of U2 connect the positive 6V signal of power supply；3 feet of U2 meet the positive 12V of power supply, and 12 feet connect power supply ground；Electric capacity C2 also connects between power supply 12V；The common port of the 2 foot connecting resistance R4 and diode D3 of comparator U2；The positive 12V of another termination power of resistance R4；The negative pole connecting resistance R5 of diode D3, electric capacity C3 common port, and be connected with 8 feet of U2, resistance R5, electric capacity C3 another public termination power ground；The 9 foot connecting resistance R10 of U2, resistance R11, resistance R12 common port, the positive 12V of another termination power of resistance R10, another termination power of resistance R11 ground；The 14 foot connecting resistance R12 of U2, each one end of resistance R13；The other end of resistance R13 is connected with resistance R14 one end, electric capacity C5 one end, as overcurrent output signal end；Another termination power ground of the positive 12V of another termination power of resistance R14, electric capacity C5.
Detailed description of the invention of the present utility model is described in conjunction with accompanying drawing although above-mentioned; but the not restriction to this utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection domain of the present utility model.
Claims (4)
1. variable-frequency power sources output current limiting current foldback circuit, is characterized in that, including: input current processes circuit (1), and the current signal that will be collected by current transformer, rectified Filtering Processing is transformed to voltage signal；Threshold currents protection circuit (2), compares the respective value of the current signal of acquirement and current limliting setting value, obtains threshold currents protection signal；Circuit overcurrent protection (3), compares the respective value of the current signal of acquirement with crossing stream setting value, obtains overcurrent protection signal after time delay.
2. variable-frequency power sources output current limiting current foldback circuit as claimed in claim 1; it is characterized in that, described input current processes circuit (1) and includes transformer T1, rectifier bridge B1, resistance R1, resistance R2, resistance R3, diode D1, diode D2, electric capacity C1 and potentiometer VR1；The two ends of current transformer T1 secondary coil are connected with 1 foot of rectifier bridge B1 and 3 feet respectively；2 feet of rectifier bridge B1 are connected with the positive pole of one end of resistance R1 and diode D1；4 feet of rectifier bridge B1 and the other end of resistance R1, one end of electric capacity C1, potentiometer VR1 one end be connected and connect power supply ground；The negative pole of diode D1 is connected with one end of resistance R2；The other end of resistance R2 and the other end of electric capacity C1, the positive pole of diode D2, resistance R3 one end be connected；The other end of resistance R3 is connected with the other end of potentiometer VR1；The negative pole of diode D2 meets the positive 12V of power supply.
3. variable-frequency power sources output current limiting current foldback circuit as claimed in claim 1, is characterized in that, threshold currents protection circuit (2) includes comparator U2, resistance R6, resistance R7, resistance R8, resistance R9 and electric capacity C4；6 feet of comparator U2 connect current input signal；7 feet of comparator U2 are connected with each one end of resistance R6, resistance R7；The positive 6V of another termination power of resistance R6；1 foot of comparator U2 is connected with one end of the resistance R7 other end, resistance R8；The other end of resistance R8 is connected with resistance R9 one end, electric capacity C4 one end, as threshold currents output signal end；Another termination power ground of the positive 12V of another termination power of resistance R9, electric capacity C4.
4. variable-frequency power sources output current limiting current foldback circuit as claimed in claim 1; it is characterized in that, circuit overcurrent protection (3) includes comparator U2, resistance R4, resistance R5, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, electric capacity C2, electric capacity C3, electric capacity C5 and diode D3；5 feet of comparator U2 connect current input signal；4 feet of U2 connect the positive 6V signal of power supply；3 feet of U2 meet the positive 12V of power supply, and 12 feet connect power supply ground；Electric capacity C2 also connects between power supply 12V；The common port of the 2 foot connecting resistance R4 and diode D3 of comparator U2；The positive 12V of another termination power of resistance R4；The negative pole connecting resistance R5 of diode D3, electric capacity C3 common port, and be connected with 8 feet of U2, resistance R5, electric capacity C3 another public termination power ground；The 9 foot connecting resistance R10 of U2, resistance R11, resistance R12 common port, the positive 12V of another termination power of resistance R10, another termination power of resistance R11 ground；The 14 foot connecting resistance R12 of U2, each one end of resistance R13；The other end of resistance R13 is connected with resistance R14 one end, electric capacity C5 one end, as overcurrent output signal end；Another termination power ground of the positive 12V of another termination power of resistance R14, electric capacity C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620220503.4U CN205389102U (en) | 2016-03-20 | 2016-03-20 | Variable frequency power supply output current -limiting current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620220503.4U CN205389102U (en) | 2016-03-20 | 2016-03-20 | Variable frequency power supply output current -limiting current foldback circuit |
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| Publication Number | Publication Date |
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| CN205389102U true CN205389102U (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620220503.4U Expired - Fee Related CN205389102U (en) | 2016-03-20 | 2016-03-20 | Variable frequency power supply output current -limiting current foldback circuit |
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| CN (1) | CN205389102U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785874A (en) * | 2016-08-30 | 2018-03-09 | 南京中兴新软件有限责任公司 | Power protection method, apparatus and circuit |
-
2016
- 2016-03-20 CN CN201620220503.4U patent/CN205389102U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785874A (en) * | 2016-08-30 | 2018-03-09 | 南京中兴新软件有限责任公司 | Power protection method, apparatus and circuit |
| CN107785874B (en) * | 2016-08-30 | 2022-05-10 | 中兴通讯股份有限公司 | Power supply protection method, device and circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160720 Termination date: 20170320 |
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| CF01 | Termination of patent right due to non-payment of annual fee |