CN108964437A - A kind of circuit promoting starting capacitance load capability - Google Patents
A kind of circuit promoting starting capacitance load capability Download PDFInfo
- Publication number
- CN108964437A CN108964437A CN201810579557.3A CN201810579557A CN108964437A CN 108964437 A CN108964437 A CN 108964437A CN 201810579557 A CN201810579557 A CN 201810579557A CN 108964437 A CN108964437 A CN 108964437A
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- circuit
- current
- relay
- control terminal
- control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of circuits for promoting starting capacitance load capability, including input terminal, output end and control terminal, the input terminal and current-limiting resistance in parallel between output end and short switch, the short switch is connect with control terminal, and short switch is opened and closed under the control of control terminal.The peak point current generated when capacitive load access is absorbed by the stable current-limiting resistance of resistance value, so that the ability for promoting starting capacitive load that modified sine wave inverter is stable, and short switch is set, after modified sine wave electric current is stablized, current-limiting resistance is shorted, it avoids current-limiting resistance that electric energy is lost, solves the problems, such as that current modified sine wave inverter startup capacitance load capability is poor and inverter losses are larger.Provide a kind of access circuit that stable can be promoted modified sine wave inverter startup capacitance load capability and not will increase inverter losses.
Description
Technical field
The present invention relates to a kind of circuits more particularly to a kind of promotion modified sine wave inverter for promoting starting load ability
Start the circuit of capacitance load capability.
Background technique
The ability of modified sine wave inverter startup capacitive load on market today is excessively poor, especially in 200W or more
Modified sine wave inverter, the capacitive load of rated power 5%-20% can only be started.In order to promote modified sine wave inversion
Device starts the ability of capacitive load, and the method generallyd use at present is a negative temperature system of connecting on the output N line of inverter
Number thermistor (NTC).This mode has certain effect to the carrying load ability for promoting modified sine wave inverter, but simultaneously
In the presence of very big drawback.Specifically, resistance value becomes smaller after NTC fever, it is further added by capacitive load or closing load connects again
Enter, inverter is easy to that short-circuit protection can be triggered, and modified sine wave inverter startup capacitive load just reduces, while concatenated
NTC also will increase the loss of inverter.It is this access NTC method can not be reliable and stable promotion modified sine wave inverter
The ability for starting capacitive load, also will increase the loss of inverter, in this regard, current urgently one kind can stablize promotion amendment sine
The ability of wave inverter startup capacitive load and the lower access circuit of loss, using helping to mention on modified sine wave inverter
Rise the ability of modified sine wave inverter startup capacitive load.
Summary of the invention
The present invention provides a kind of circuits for promoting starting capacitance load capability, it is intended to it is sinusoidal to solve amendment at present
Wave inverter startup capacitance load capability is poor and the larger problem of inverter losses.
To achieve the above object, the present invention provides a kind of circuit for promoting starting capacitance load capability, including input terminal,
Output end and control terminal, the input terminal and current-limiting resistance in parallel between output end and short switch, the short switch and control
End connection, short switch are opened and closed under the control of control terminal.
Compared with prior art, a kind of circuit promoting starting capacitance load capability disclosed by the invention, using correcting
Between sinewave inverter and load, as the access circuit of capacitive load, capacitive load is absorbed by setting current-limiting resistance and is connect
The peak point current of fashionable generation avoids influence of the peak point current to inverter to promote modified sine wave inverter startup capacitive
The ability of load, also, due to using current-limiting resistance rather than NTC, the resistance value of current-limiting resistance is stablized, will not be the same with NTC,
The resistance decrease when temperature rises, peak point current assimilation effect is deteriorated, so that the starting load ability of modified sine wave inverter
It reduces, solves the problems, such as to use NTC promotion modified sine wave inverter startup capacitance load capability unstable at present.Meanwhile
This kind of capacitive load access circuit is additionally provided with controllable short switch, and in capacitive load access, control terminal can control short
Way switch disconnects, so that current-limiting resistance accesses circuit absorption peak electric current, after capacitive load access, modified sine wave inverter
When electric current is basicly stable, control terminal can control short switch closure, so that current-limiting resistance is short-circuited, current-limiting resistance increase be avoided to repair
The loss of positive sinewave inverter.In this kind of capacitive load access circuit, current-limiting resistance is in parallel with short switch, short by controlling
The opening and closing of way switch can control whether current-limiting resistance accesses, and solve modified sine wave inverter caused by series connection NTC at present
The problem of loss increases.In this regard, a kind of circuit for promoting starting capacitance load capability provided by the invention, stable by resistance value
Current-limiting resistance absorbs the peak point current generated when capacitive load access, so that the promotion starting appearance that modified sine wave inverter is stable
Property load ability, and short switch is set, after modified sine wave electric current is stablized, current-limiting resistance is shorted, current limliting is avoided
It is poor biggish with inverter losses to solve current modified sine wave inverter startup capacitance load capability for resistance loss electric energy
Problem provides a kind of can stablize and promotes modified sine wave inverter startup capacitance load capability and not will increase inverter losses
Access circuit.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram 1 for the circuit for promoting starting capacitance load capability of the present invention；
Fig. 2 is a kind of structural block diagram 2 for the circuit for promoting starting capacitance load capability of the present invention；
Fig. 3 is a kind of structural block diagram 3 for the circuit for promoting starting capacitance load capability of the present invention；
Fig. 4 is a kind of circuit diagram of the one embodiment for the circuit for promoting starting capacitance load capability of the present invention.
Specific embodiment
As shown in Figure 1, the present invention provides a kind of circuit for promoting starting capacitance load capability, including input terminal, output
End and control terminal, the input terminal connect with current-limiting resistance in parallel between output end and short switch, the short switch and control terminal
It connects, short switch is opened and closed under the control of control terminal.It is generated when absorbing capacitive load access by the stable current-limiting resistance of resistance value
Peak point current so that the ability of the stable promotion starting capacitive load of modified sine wave inverter, and is arranged short switch,
After modified sine wave electric current is stablized, current-limiting resistance is shorted, avoids current-limiting resistance that electric energy is lost, it is sinusoidal to solve amendment at present
Wave inverter startup capacitance load capability is poor and the larger problem of inverter losses, provides a kind of can stablize and is promoting amendment just
String wave inverter startup capacitance load capability and the access circuit that not will increase inverter losses.
As shown in Fig. 2, the short switch includes relay circuit, relay control terminal and capacitive load access circuit
Control terminal connection, relay common end connect with current-limiting resistance one end, and relay normally open end or normal-closed end and current-limiting resistance are another
End connection, the short circuit or access of the open and close control current-limiting resistance of relay.Relay is in parallel with current-limiting resistance, by controlling relay
The access or short circuit of current-limiting resistance are realized in the opening and closing of device.Specifically, when relay normally open end is connect with current-limiting resistance, relay
Normal-closed end is hanging, and when relay is in normally off, current-limiting resistance is accessed between modified sine wave inverter and capacitive load, can
Absorption peak electric current, when relay closure, relay normally open port, which is formed, is shorted circuit, and current-limiting resistance is short-circuited, and amendment is just
String wave inverter is formed into a loop by relay normally open end, avoids current-limiting resistance that electric energy is lost.But only due to current-limiting resistance
The absorption peak electric current in capacitive load access, modified sine wave inverter current need for current-limiting resistance to be shorted when stablizing, such as
Relay normally open end is connect by fruit with current-limiting resistance one end, it is necessary to long-term to guarantee relay closure to realize to current-limiting resistance
Short circuit, the long secondary closure of guard relay are also required to consume a large amount of electric energy, not be inconsistent with the purpose of design of this circuit.In this regard, can incite somebody to action
The normal-closed end of relay and one end of current-limiting resistance connect, and relay normal-closed end is by current-limiting resistance short circuit, only in capacitive load
Access, which needs to make using closing relay when current-limiting resistance relay to jump normally open end, terminates short circuit to current-limiting resistance, current limliting
Resistance accesses between modified sine wave inverter and capacitive load, absorption peak electric current, that is, can guarantee the usual state of current-limiting resistance
Lower short circuit, and it is not necessarily to the long secondary closure of guard relay, it really realizes and reduces electric energy loss.
Filter capacitor is arranged in the power input of the relay circuit.Filter capacitor is arranged in relay power incoming end,
The clutter of input power is filtered out, stable power supply is provided for relay.The filter capacitor can choose electrolytic capacitor, electrolysis electricity
The capacitance of appearance is larger, there is relatively good low frequency filtering effect.
As shown in Figure 3 and Figure 4, control is provided between the relay control terminal and the control terminal of capacitive load access circuit
Circuit, the control circuit include triode and first resistor, and first resistor is connected on the control terminal of capacitive load access circuit
Between the base stage of triode, transistor emitter ground connection, transistor collector is connect with relay control terminal.In relay control
Control circuit is accessed before end processed, the opening and closing of relay is controlled by triode, control circuit input terminal connects as the capacitive load
Enter the control terminal of circuit, which can connect with single-chip microcontroller and other main control devices, the intelligence opening and closing of relay be realized, in master
It controls and is automatically accessed and short circuit current limitation resistance under the control of equipment.
The triode is switching transistor, guarantees the control effect of relay using switching transistor, so that relay
It can be reliably opened and closed under the control of main control device.
As shown in Figure 3 and Figure 4, the control circuit further includes RC filter circuit, and the RC filter circuit is arranged first
Between resistance and transistor base.RC filter circuit is arranged before triode, can filter out signal noise, will be reliable and stable
Control signal is transmitted to triode, that is, avoids clutter from damaging triode, in turn ensure the reliable control of triode.
It is of the present invention it is a kind of promoted starting capacitance load capability circuit a specific embodiment as shown in figure 4,
Relay-Signal can be connect as the control terminal of capacitive load access circuit with main control device, and control terminal passes through first resistor R1
It connect with the base stage of switching transistor Q1, is arranged between first resistor R1 and switching transistor Q1 by second resistance R2 and the second capacitor
The RC filter circuit of C2 composition, second resistance R2 and the second capacitor C2 earth, the emitter ground connection of switching transistor Q1, are opened
The collector for closing triode Q1 is connect with relay K1 control terminal, the input of the common end relay K1 and capacitive load access circuit
End connection, relay K1 normal-closed end are connect with the output end of capacitive load access circuit, and relay K1 power input connects 12V
Power supply, filter capacitor C1 are connected across between power input and ground, current-limiting resistance R0 be connected in parallel on the common end relay K1 with it is normally closed
Between end.Capacitive load access circuit is serially connected between modified sine wave inverter and capacitive load, capacitive load access electricity
The control terminal on road is controlled by the main control device (MCU) of inverter.When inverter MCU detects output peak current overload,
Relay-Signal signal is to 5V high level, Q1 conducting；Relay K1 closure, inverter form output loop by R0, with
The capacitor of capacitive load forms RC absorption circuit, the ability of modified sine wave starting capacitive load is promoted, when inverter startup is complete
Bi Hou, inverter MCU end Relay-Signal signal to low level 0V, Q1；Relay is reset to normally off, relay
R0 is shorted；Inverter forms output loop by relay K1 normal-closed end mouth, and being formed by R0 for inverter is avoided to export
Circuit, the loss of generation.This kind of capacitive load access circuit solves modified sine wave band capacitance load capability；Inverter internal
MCU exports peak point current by detection inversion, to control the access or short circuit of current-limiting resistance.Thus to promote modified sine wave band
The ability of capacitive load can only start the capacitive load of rated power 5%-20% more in the past, be increased to starting rated power
The capacitive load of 20%-70%.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (6)
1. a kind of circuit for promoting starting capacitance load capability, including input terminal, output end and control terminal, which is characterized in that institute
It states current-limiting resistance and short switch in parallel, the short switch between input terminal and output end to connect with control terminal, short switch exists
It is opened and closed under the control of control terminal.
2. a kind of circuit for promoting starting capacitance load capability according to claim 1, which is characterized in that the short circuit is opened
Closing includes relay circuit, and relay control terminal is connect with the control terminal of capacitive load access circuit, relay common end and limit
The connection of leakage resistance one end, relay normally open end or normal-closed end are connect with the current-limiting resistance other end, the open and close control current limliting of relay
The short circuit or access of resistance.
3. a kind of circuit for promoting starting capacitance load capability according to claim 2, which is characterized in that the relay
Filter capacitor is arranged in the power input of circuit.
4. a kind of circuit for promoting starting capacitance load capability according to claim 2, which is characterized in that the relay
It is provided with control circuit between control terminal and the control terminal of capacitive load access circuit, the control circuit includes triode and first
Resistance, first resistor are connected between the control terminal of capacitive load access circuit and the base stage of triode, and transistor emitter connects
Ground, transistor collector are connect with relay control terminal.
5. a kind of circuit for promoting starting capacitance load capability according to claim 4, which is characterized in that the triode
For switching transistor.
6. a kind of circuit for promoting starting capacitance load capability according to claim 4 or 5, which is characterized in that the control
Circuit processed further includes RC filter circuit, and the RC filter circuit is arranged between first resistor and transistor base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579557.3A CN108964437A (en) | 2018-06-07 | 2018-06-07 | A kind of circuit promoting starting capacitance load capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579557.3A CN108964437A (en) | 2018-06-07 | 2018-06-07 | A kind of circuit promoting starting capacitance load capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108964437A true CN108964437A (en) | 2018-12-07 |
Family
ID=64493587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810579557.3A Pending CN108964437A (en) | 2018-06-07 | 2018-06-07 | A kind of circuit promoting starting capacitance load capability |
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| Country | Link |
|---|---|
| CN (1) | CN108964437A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134755Y (en) * | 2007-11-20 | 2008-10-15 | 深圳和而泰智能控制股份有限公司 | Variable-frequency power supply circuit protecting device |
| CN101694938A (en) * | 2009-10-27 | 2010-04-14 | 浪潮电子信息产业股份有限公司 | Surging current suppression method |
| CN202145567U (en) * | 2011-06-27 | 2012-02-15 | 中国国土资源航空物探遥感中心 | Starting-up protector for aviation electromagnetic instrument emission system |
| CN102931647A (en) * | 2011-08-10 | 2013-02-13 | 海洋王照明科技股份有限公司 | Surge current suppression circuit and lamp |
| CN202888816U (en) * | 2012-10-11 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | Slow starting circuit suitable for large capacitive load |
-
2018
- 2018-06-07 CN CN201810579557.3A patent/CN108964437A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134755Y (en) * | 2007-11-20 | 2008-10-15 | 深圳和而泰智能控制股份有限公司 | Variable-frequency power supply circuit protecting device |
| CN101694938A (en) * | 2009-10-27 | 2010-04-14 | 浪潮电子信息产业股份有限公司 | Surging current suppression method |
| CN202145567U (en) * | 2011-06-27 | 2012-02-15 | 中国国土资源航空物探遥感中心 | Starting-up protector for aviation electromagnetic instrument emission system |
| CN102931647A (en) * | 2011-08-10 | 2013-02-13 | 海洋王照明科技股份有限公司 | Surge current suppression circuit and lamp |
| CN202888816U (en) * | 2012-10-11 | 2013-04-17 | 中国科学院西安光学精密机械研究所 | Slow starting circuit suitable for large capacitive load |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
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| RJ01 | Rejection of invention patent application after publication |