CN203932964U - A kind of current foldback circuit of energy conversion system - Google Patents
A kind of current foldback circuit of energy conversion system Download PDFInfo
- Publication number
- CN203932964U CN203932964U CN201420304964.0U CN201420304964U CN203932964U CN 203932964 U CN203932964 U CN 203932964U CN 201420304964 U CN201420304964 U CN 201420304964U CN 203932964 U CN203932964 U CN 203932964U
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- voltage
- energy conversion
- conversion system
- current foldback
- circuit
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Abstract
The utility model discloses a kind of current foldback circuit of energy conversion system; it is characterized in that: described current foldback circuit is that energy conversion system AC three-phase bus obtains sampled voltage through voltage sensor; sampled voltage accesses two-way voltage comparator and reference voltage OC_REF-and OC_REF+ by operational amplifier and compares, and two-way voltage comparator connects hardware protection circuit.Owing to adopting above-mentioned circuit structure, in the detection pcs system that the utility model can be real-time, whether electric current there is over-current phenomenon avoidance, and overcurrent protection is provided, and whole process does not need software operation, the high security of assurance system operation.
Description
Technical field
The utility model relates to energy conversion system, particularly a kind of current foldback circuit of energy conversion system.
Background technology
Energy conversion system (pcs system) operation overcurrent has very large danger, light cause the damage of components and parts, and heavy whole system is collapsed, and occurs safety problem.
Energy conversion system (PCS) is mainly to adopt to have software detecting method aspect overcurrent protection at present; by AD, sample and obtain current sensor biography sampled signal values in pcs system; determine size of current, then with given threshold value comparison, determine whether overcurrent of pcs system electric current.But this software detecting method needs certain reaction time, has real time problems, and the accuracy of the stability influence software detection of running software.
For the problems referred to above, a kind of novel current foldback circuit is provided, by the mode of hardware circuit, energy conversion system being carried out to overcurrent protection is the problem that prior art need to solve.
Utility model content
Technical problem to be solved in the utility model is, a kind of current foldback circuit of energy conversion system is provided, and by the mode of hardware circuit, energy conversion system carried out to overcurrent protection.
For achieving the above object; the technical solution of the utility model is; a kind of current foldback circuit of energy conversion system; it is characterized in that: described current foldback circuit is that energy conversion system AC three-phase bus obtains sampled voltage through voltage sensor; sampled voltage accesses two-way voltage comparator and reference voltage OC_REF-and OC_REF+ by operational amplifier and compares, and two-way voltage comparator connects hardware protection circuit.
In described operational amplification circuit, be connected to the bias voltage of 1.65V.
The former secondary turn ratio of described voltage sensor is: 2000:1.
The output area value of described operational amplification circuit is 0.94V-2.35V.
Described reference voltage OC_REF-and the magnitude of voltage of OC_REF+ are 0.743V, 2.537V.
A kind of current foldback circuit of energy conversion system; owing to adopting above-mentioned circuit structure, in the detection pcs system that the utility model can be real-time, whether electric current there is over-current phenomenon avoidance, and overcurrent protection is provided; whole process does not need software operation, the high security of assurance system operation.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;
Fig. 1 is the structured flowchart of the current foldback circuit of a kind of energy conversion system of the utility model;
Fig. 2 is the circuit theory diagrams of the current foldback circuit of a kind of energy conversion system of the utility model;
Fig. 3 is the reference voltage output circuit figure of the current foldback circuit of a kind of energy conversion system of the utility model;
In Fig. 1,1, voltage sensor; 2, operational amplification circuit; 3, two-way voltage comparator; 4, hardware protection circuit.
Embodiment
The utility model is that energy conversion system AC three-phase bus obtains sampled voltage through voltage sensor 1; sampled voltage compares with reference voltage OC_REF-and OC_REF+ by operational amplifier 2 access two-way voltage comparators 3, and two-way voltage comparator 3 connects hardware protection circuit 4.
It is concrete that pcs system AC three-phase bus, after voltage sensor 1, obtains a less voltage as shown in Figure 1, then after amplifier, its output voltage and OC_REF-and OC_REF+ comparison.Go beyond the scope and carry out hardware protection processing.The former secondary turn ratio of voltage sensor 1 is: 2000:1.Ac bus electric current is ip, has after overvoltage sensor 1, and output current is is=1/2000*ip.
As shown in Figure 2, voltage sensor output CM1, connects the resistance to earth of a 20R, has vi=is*20 after converting voltage to.Through amplifier, nurse one's health :-3.3/30k+vi/50k+vout/15k=0, has output voltage vout=1.65-0.3vi.Amplifier level has added the bias voltage of a 1.65V, and the voltage after over-current sensor output can be higher than 1.65V, so added after a biasing, negative voltage has just become a positive magnitude of voltage.Outlet side at circuit has also added a voltage comparator, by the size of given voltage is set, can carry out a hardware protection to alternating current.When nursing one's health the upper limit of the value of voltage over set-point, represent alternating current forward overcurrent; When nursing one's health the lower limit of the value of voltage lower than set-point, represent alternating current negative sense overcurrent.No matter any situation, can send out a guard signal, PCS is carried out to the protection of overcurrent.
PCS design maximum power 100KW, in AC-AC ideal state, current peak 236.36A, according to current sensor, its output voltage signal CM1 peak value is 236.36/2000*20=2.3636V.Output voltage signal CM1 entered after operational amplifier 2, and its voltage signal output area value is 0.94V-2.35V.Voltage-output signal entered after two-way voltage comparator 3, and the reference value of reference voltage OC_REF-and OC_REF+ is 0.743V, 2.537V.Fig. 3 is shown in its magnitude of voltage output, can be calculated major loop hardware alarms threshold value 296A.
By reference to the accompanying drawings the utility model is exemplarily described above; obviously the utility model specific implementation is not subject to the restrictions described above; as long as the various improvement that adopted technical solutions of the utility model to carry out; or directly apply to other occasion without improvement, all within protection range of the present utility model.
Claims (5)
1. the current foldback circuit of an energy conversion system; it is characterized in that: described current foldback circuit is that energy conversion system AC three-phase bus obtains sampled voltage through voltage sensor (1); sampled voltage compares with reference voltage OC_REF-and OC_REF+ by operational amplifier (2) access two-way voltage comparator (3), and two-way voltage comparator (3) connects hardware protection circuit (4).
2. the current foldback circuit of a kind of energy conversion system according to claim 1, is characterized in that: the bias voltage that is connected to 1.65V in described operational amplification circuit (2).
3. the current foldback circuit of a kind of energy conversion system according to claim 1, is characterized in that: the former secondary turn ratio of described voltage sensor (1) is: 2000:1.
4. the current foldback circuit of a kind of energy conversion system according to claim 1, is characterized in that: the output area value of described operational amplification circuit (2) is 0.94V-2.35V.
5. the current foldback circuit of a kind of energy conversion system according to claim 1, is characterized in that: described reference voltage OC_REF-and the magnitude of voltage of OC_REF+ are 0.743V, 2.537V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420304964.0U CN203932964U (en) | 2014-06-09 | 2014-06-09 | A kind of current foldback circuit of energy conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420304964.0U CN203932964U (en) | 2014-06-09 | 2014-06-09 | A kind of current foldback circuit of energy conversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203932964U true CN203932964U (en) | 2014-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420304964.0U Expired - Fee Related CN203932964U (en) | 2014-06-09 | 2014-06-09 | A kind of current foldback circuit of energy conversion system |
Country Status (1)
| Country | Link |
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| CN (1) | CN203932964U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541974A (en) * | 2018-11-26 | 2019-03-29 | 北京宇航系统工程研究所 | A kind of plug-in connector control circuit |
-
2014
- 2014-06-09 CN CN201420304964.0U patent/CN203932964U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541974A (en) * | 2018-11-26 | 2019-03-29 | 北京宇航系统工程研究所 | A kind of plug-in connector control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20200609 |