CN202949356U - Electrifying cushion protection circuit - Google Patents
Electrifying cushion protection circuit Download PDFInfo
- Publication number
- CN202949356U CN202949356U CN 201220607614 CN201220607614U CN202949356U CN 202949356 U CN202949356 U CN 202949356U CN 201220607614 CN201220607614 CN 201220607614 CN 201220607614 U CN201220607614 U CN 201220607614U CN 202949356 U CN202949356 U CN 202949356U
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- Prior art keywords
- circuit
- control relay
- filtering capacitor
- electrifying
- protection circuit
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- 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.)
- Expired - Fee Related
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Abstract
Provided is an electrifying cushion protection circuit. A buffer resistor is connected between a rectifying circuit and a filter capacitor, the filter capacitor is connected with a sampling comparator circuit, the sampling comparator circuit is formed by an operational amplifier, the sampling comparator circuit is in output connection with a driving circuit, the driving circuit is connected with and a control relay, and the control relay is connected with the buffer resistor. The electrifying cushion protection circuit has the advantages of adopting the operational amplifier to sample voltage of the filter capacitor, controlling switching of the buffer resistor, avoiding impact produced by current when an inverter device is electrified on a power supply and self circuits of a device, accordingly interference and damage to the power supply and the inverter device are avoided.
Description
Technical field
The utility model relates to a kind of protective circuit, and relating in particular to a kind of operational amplifier that adopts is the buffer protection circuit that powers on that detects and control.
Background technology
at present, there are rectification and filter circuit in existing inverter inside, usually rectification circuit directly is connected with filter capacitor, because the capacity of filter capacitor is larger, and the characteristic that can not suddenly change due to the voltage at capacitor two ends, make inverter have very large charging current at powered on moment, this electric current all can produce strong impact to the rectifier of rectification circuit and filtering capacitor and power supply, rectification circuit to power supply unit and inverter, filtering capacitor all has a negative impact, the useful life of shortening equipment, even cause device damage, simultaneously also to power supply, inverter and other equipment produce and disturb.
Summary of the invention
The purpose of this utility model is to provide a kind of buffer protection circuit that powers on, and can cushion by the impact electric current in the power up of inverter, thereby avoids equipment be damaged and disturb generation in power up.
The utility model is achieved like this, it comprises rectification circuit, buffer resistance, filtering capacitor, sampling comparison circuit, drive circuit, control relay, it is characterized in that being connected buffer resistance between rectification circuit and filtering capacitor, filtering capacitor connects the sampling comparison circuit, the sampling comparison circuit is made of operational amplifier, its output connects drive circuit, and drive circuit connects control relay, and control relay connects buffer resistance.
In addition, the sampling comparison circuit is also exported the settling signal that powers on.Work with other circuit of control inverter device.
When connecting input power, filtering capacitor is charged through buffer resistance by the electric current after rectifier rectification, simultaneously, the operational amplifier that is connected on the sampling comparison circuit on filtering capacitor is monitored the voltage at filtering capacitor two ends, when the both end voltage of filtering capacitor rise to rated voltage 1/3 the time, sampling comparison circuit output switching signal, this signal amplifies the adhesive of rear drive control relay through drive circuit, with the buffer resistance short circuit, complete power up.
Technique effect of the present utility model is, charging current when adopting buffer resistance to device power at the initial stage that inverter powers on cushions, adopt simultaneously the sampling comparison circuit of operational amplifier that the both end voltage of filtering capacitor is monitored, control the switching of buffer resistance, the impact that when having avoided inverter directly to power on, electric current produces is effectively avoided producing and is disturbed and device damage.
Description of drawings
Fig. 1 is the fundamental diagram of a kind of buffer protection circuit that powers on of the utility model.
Rectification circuit 2, buffer resistance 3, filtering capacitor 4, sampling comparison circuit 5, drive circuit 6, control relay in the drawings, 1.
Embodiment
As shown in Figure 1, the utility model comprises rectification circuit (1), buffer resistance (2), filtering capacitor (3), sampling comparison circuit (4), drive circuit (5), control relay (6), be connected buffer resistance 2 between rectification circuit 1 and filtering capacitor 3, filtering capacitor 3 connects sampling comparison circuit 4, sampling comparison circuit 4 is made of operational amplifier, its output connects drive circuit 5, and drive circuit 5 connects control relay 6, and control relay 6 connects buffer resistance 2.
When connecting input power, filtering capacitor is charged through buffer resistance by the electric current after rectifier rectification, simultaneously, the operational amplifier that is connected in the sampling comparison circuit on filtering capacitor carries out sampling monitoring to the voltage at filtering capacitor two ends, and compares with given voltage.Given voltage is set as 1/3 of input power rated voltage, when the both end voltage of filtering capacitor rise to rated voltage 1/3 the time, sampling comparison circuit output connection signal, this signal amplifies the adhesive of rear drive control relay through drive circuit, with the buffer resistance short circuit, completed power up.
In addition, the sampling comparison circuit is also exported the settling signal that powers on, with the work of other partial circuits of control inverter device.
Claims (1)
1. buffer protection circuit that powers on; it comprises rectification circuit, buffer resistance, filtering capacitor, sampling comparison circuit, drive circuit, control relay; it is characterized in that being connected buffer resistance between rectification circuit and filtering capacitor; filtering capacitor connects the sampling comparison circuit; the sampling comparison circuit is made of operational amplifier; its output connects drive circuit, and drive circuit connects control relay, and control relay connects buffer resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220607614 CN202949356U (en) | 2012-11-17 | 2012-11-17 | Electrifying cushion protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220607614 CN202949356U (en) | 2012-11-17 | 2012-11-17 | Electrifying cushion protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202949356U true CN202949356U (en) | 2013-05-22 |
Family
ID=48425034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220607614 Expired - Fee Related CN202949356U (en) | 2012-11-17 | 2012-11-17 | Electrifying cushion protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202949356U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346760A (en) * | 2013-06-14 | 2013-10-09 | 成都锐奕信息技术有限公司 | Buffer circuit used when port is powered on |
| CN105869570A (en) * | 2016-05-25 | 2016-08-17 | 广西东显电子有限公司 | Energy-saving LED display screen |
-
2012
- 2012-11-17 CN CN 201220607614 patent/CN202949356U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346760A (en) * | 2013-06-14 | 2013-10-09 | 成都锐奕信息技术有限公司 | Buffer circuit used when port is powered on |
| CN105869570A (en) * | 2016-05-25 | 2016-08-17 | 广西东显电子有限公司 | Energy-saving LED display screen |
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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 |
Granted publication date: 20130522 Termination date: 20201117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |