CN102279304A - Direct current bus voltage detecting circuit for low voltage frequency converter - Google Patents
Direct current bus voltage detecting circuit for low voltage frequency converter Download PDFInfo
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- CN102279304A CN102279304A CN2011100809883A CN201110080988A CN102279304A CN 102279304 A CN102279304 A CN 102279304A CN 2011100809883 A CN2011100809883 A CN 2011100809883A CN 201110080988 A CN201110080988 A CN 201110080988A CN 102279304 A CN102279304 A CN 102279304A
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Abstract
The invention discloses a direct current bus voltage detecting circuit for a low voltage frequency converter. The direct current bus voltage detecting circuit comprises a filter, a high frequency transformer and a voltage sampling output circuit, wherein the primary side of the high frequency transformer is connected with a direct current bus by the filter; and the voltage sampling output circuit comprises a secondary side corresponding to the primary side of the lower winding of the high frequency transformer, and a filter circuit which is connected with the output end of the secondary side. Direct current bus input is isolated from voltage sampling output by the high frequency transformer, and strong electricity is electromagnetically isolated from weak electricity, so that interference is lowered. The voltage sampling output circuit consists of a coil and a simple filter circuit and has low cost compared with the resistance voltage-dividing circuit and the linear isolation optical coupler circuit of the conventional voltage sampling output circuit.
Description
Technical field
The present invention relates to a kind of DC bus-bar voltage detection technique of low voltage frequency converter, relate in particular to a kind of DC bus-bar voltage testing circuit of low voltage frequency converter.
Background technology
Detection modes such as electric resistance partial pressure or linear isolation optocoupler are generally adopted in the detection of the DC bus-bar voltage of low voltage frequency converter (220VAC, 380VAC, 440VAC, 460VAC input rank) at present.As shown in Figure 1, be the DC bus-bar voltage testing circuit of existing a kind of low voltage frequency converter, comprise voltage sample output circuit 5 (being resistor voltage divider circuit or the linear photoelectric coupled circuit of isolating) and the power circuit that constitutes by voltage feedback circuit 2, current feedback circuit 3, power management module 4, wave filter L1, high-frequency transformer PT1 and metal-oxide-semiconductor field effect transistor V2 etc.Wherein, high-frequency transformer PT1 comprises winding and following winding, the secondary of last winding links to each other with accessory power supply output circuit 1, the output voltage that voltage feedback circuit 2 is gathered accessory power supply output circuit 1 is sent to power management module 4, the electric current that current feedback circuit 3 is gathered the former limit of high-frequency transformer PT1 winding is sent to power management module 4, in one-period, power management module 4 is compared these voltages, electric current with predefined voltage, current threshold, when reaching threshold value, metal-oxide-semiconductor field effect transistor V2 conducting, otherwise metal-oxide-semiconductor field effect transistor V2 ends.Power circuit gives the voltage sample output circuit 5 power supplies, powers to the low voltage frequency converter remaining circuit simultaneously.The CPU analog quantity I/O mouth of low voltage frequency converter is sent in circuit 5 outputs after treatment.
Yet above-mentioned employing electric resistance partial pressure detection mode can not be isolated the strong and weak electricity interference, and adopts the linear optocoupler detection mode of isolating, and disturbs though can isolate strong and weak electricity, and cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of strong and weak electricity of can isolating to disturb, again the DC bus-bar voltage testing circuit of lower-cost low voltage frequency converter.
For achieving the above object, the invention provides a kind of DC bus-bar voltage testing circuit of low voltage frequency converter, comprise wave filter, high-frequency transformer and voltage sample output circuit, the former limit of described high-frequency transformer links to each other with dc bus by described wave filter, described voltage sample output circuit comprises the corresponding secondary in former limit with the following winding of described high-frequency transformer, and the filtering circuit that links to each other with the output terminal of described secondary.
The DC bus-bar voltage testing circuit of low voltage frequency converter of the present invention, described filtering circuit comprises resistance R 19, diode D3, capacitor C 10, capacitor C 11 and capacitor C 12, one end of resistance R 19 links to each other with 15 pins of described secondary, the other end of resistance R 19 links to each other with the input end of diode D3 and an end of capacitor C 10 respectively, the output terminal of diode D3 links to each other with an end of capacitor C 11 and an end of capacitor C 12 respectively, and the other end of the other end of capacitor C 10, capacitor C 11 then links to each other with 16 pins of described secondary with the other end of capacitor C 12.
The former limit of the high-frequency transformer of the DC bus-bar voltage testing circuit of low voltage frequency converter of the present invention links to each other with dc bus by wave filter, the voltage sample output circuit comprises the corresponding secondary in former limit with the following winding of high-frequency transformer, and the filtering circuit that links to each other with the output terminal of secondary, as seen, dc bus input and voltage sample output are through the isolation of high-frequency transformer, realized the electromagnetic isolation of strong and weak electricity, made to disturb and reduce.And the voltage sample output circuit is to be made of coil and simple filtering circuit, compares with the linear photoelectric coupled circuit of isolating with the resistor voltage divider circuit of existing voltage sample output circuit, and its cost is very low.
Description of drawings
Fig. 1 is the circuit theory diagrams of the DC bus-bar voltage testing circuit of existing a kind of low voltage frequency converter;
Fig. 2 is the circuit theory diagrams of the DC bus-bar voltage testing circuit of low voltage frequency converter of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail:
With reference to shown in Figure 2, the DC bus-bar voltage testing circuit of low voltage frequency converter of the present invention, it is the improvement on the basis of the DC bus-bar voltage testing circuit of existing low voltage frequency converter, wherein, the former limit of high-frequency transformer PT1 links to each other with dc bus by wave filter L1, voltage sample output circuit 5 comprises the corresponding secondary 51 in former limit with the following winding of high-frequency transformer PT1, and the filtering circuit 52 that links to each other with the output terminal of secondary 51.And filtering circuit 52 comprises resistance R 19, diode D3, capacitor C 10, capacitor C 11 and capacitor C 12, one end of resistance R 19 links to each other with 15 pins of described secondary 51, the other end of resistance R 19 links to each other with the input end of diode D3 and an end of capacitor C 10 respectively, the output terminal of diode D3 links to each other with an end of capacitor C 11 and an end of capacitor C 12 respectively, as DCOUT, the other end of the other end of the other end of capacitor C 10, capacitor C 11 and capacitor C 12 then links to each other with 16 pins of described secondary 51, as GND.
In the DC bus-bar voltage testing circuit of low voltage frequency converter of the present invention, when switching tube V2 opens, 1 pin on the former limit of the last winding of high-frequency transformer PT1 is for just, 15 pin of the secondary of the following winding of high-frequency transformer PT1 are for just, diode D3 conducting, this moment, the DCOUT output voltage was given follow-up treatment circuit through after the filtering.When switching tube V2 by the time, 1 pin on former limit of last winding that uprises frequency power transformer PT1 is for negative, 15 pin of the secondary of the following winding of high-frequency transformer PT1 are for negative, diode D3 ends, at this moment the DCOUT no-output.Promptly in one-period, DCOUT output when switching tube V2 opens relies on C11, C12 accumulation of energy filtering output when ending.
Above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (2)
1. the DC bus-bar voltage testing circuit of a low voltage frequency converter, comprise wave filter (L1), high-frequency transformer (PT1) and voltage sample output circuit (5), it is characterized in that, the former limit of described high-frequency transformer (PT1) links to each other with dc bus by described wave filter (L1), described voltage sample output circuit (5) comprises the corresponding secondary (51) in former limit with the following winding of described high-frequency transformer (PT1), and the filtering circuit (52) that links to each other with the output terminal of described secondary (51).
2. the DC bus-bar voltage testing circuit of low voltage frequency converter according to claim 1, it is characterized in that, described filtering circuit (52) comprises resistance R 19, diode D3, capacitor C 10, capacitor C 11 and capacitor C 12, one end of resistance R 19 links to each other with 15 pins of described secondary (51), the other end of resistance R 19 links to each other with the input end of diode D3 and an end of capacitor C 10 respectively, the output terminal of diode D3 links to each other the other end of capacitor C 10 with an end of capacitor C 11 and an end of capacitor C 12 respectively, the other end of the other end of capacitor C 11 and capacitor C 12 then links to each other with 16 pins of described secondary (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100809883A CN102279304A (en) | 2011-03-31 | 2011-03-31 | Direct current bus voltage detecting circuit for low voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100809883A CN102279304A (en) | 2011-03-31 | 2011-03-31 | Direct current bus voltage detecting circuit for low voltage frequency converter |
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| CN102279304A true CN102279304A (en) | 2011-12-14 |
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| CN2011100809883A Pending CN102279304A (en) | 2011-03-31 | 2011-03-31 | Direct current bus voltage detecting circuit for low voltage frequency converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866278A (en) * | 2012-06-28 | 2013-01-09 | 深圳市汇川技术股份有限公司 | Output voltage detecting circuit for frequency changer and frequency changer |
| CN103063905A (en) * | 2012-12-14 | 2013-04-24 | 王奉瑾 | Single battery voltage isolation detecting system |
| CN108490293A (en) * | 2018-03-23 | 2018-09-04 | 天津职业技术师范大学 | A kind of detection circuit and control method of three-phase inverter |
| CN109254200A (en) * | 2018-11-16 | 2019-01-22 | 美钻深海能源科技研发（上海）有限公司 | For detecting the isolated DC voltage sensor of DC24V voltage stability |
| CN111220837A (en) * | 2018-11-26 | 2020-06-02 | 宝山钢铁股份有限公司 | Output voltage detector of broadband PWM frequency converter |
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
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| JPS63103668A (en) * | 1986-10-21 | 1988-05-09 | Nippon Telegr & Teleph Corp <Ntt> | Push-pull converter with booster |
| JPH0365055A (en) * | 1989-07-31 | 1991-03-20 | Canon Inc | Electric source apparatus |
| EP0505662A1 (en) * | 1991-03-28 | 1992-09-30 | COMTEC ELECTRONICS PRODUCTS AND COMPONENTS S.r.l. | A variable time-on/time-off chopper |
| EP1432108A1 (en) * | 2002-12-17 | 2004-06-23 | Shindengen Electric Manufacturing Company, Limited | DC-DC converter having input voltage compensating circuit |
| CN101442252A (en) * | 2008-12-31 | 2009-05-27 | 焦作市明株自动化工程有限责任公司 | DC bus-bar voltage collection circuit for frequency changer |
| CN101534061A (en) * | 2009-04-09 | 2009-09-16 | 福州大学 | A double-isolation boosting multi-input direct current convertor |
| CN201562001U (en) * | 2009-09-18 | 2010-08-25 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampler of intermediate-voltage transducer |
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2011
- 2011-03-31 CN CN2011100809883A patent/CN102279304A/en active Pending
Patent Citations (7)
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| JPS63103668A (en) * | 1986-10-21 | 1988-05-09 | Nippon Telegr & Teleph Corp <Ntt> | Push-pull converter with booster |
| JPH0365055A (en) * | 1989-07-31 | 1991-03-20 | Canon Inc | Electric source apparatus |
| EP0505662A1 (en) * | 1991-03-28 | 1992-09-30 | COMTEC ELECTRONICS PRODUCTS AND COMPONENTS S.r.l. | A variable time-on/time-off chopper |
| EP1432108A1 (en) * | 2002-12-17 | 2004-06-23 | Shindengen Electric Manufacturing Company, Limited | DC-DC converter having input voltage compensating circuit |
| CN101442252A (en) * | 2008-12-31 | 2009-05-27 | 焦作市明株自动化工程有限责任公司 | DC bus-bar voltage collection circuit for frequency changer |
| CN101534061A (en) * | 2009-04-09 | 2009-09-16 | 福州大学 | A double-isolation boosting multi-input direct current convertor |
| CN201562001U (en) * | 2009-09-18 | 2010-08-25 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampler of intermediate-voltage transducer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866278A (en) * | 2012-06-28 | 2013-01-09 | 深圳市汇川技术股份有限公司 | Output voltage detecting circuit for frequency changer and frequency changer |
| CN103063905A (en) * | 2012-12-14 | 2013-04-24 | 王奉瑾 | Single battery voltage isolation detecting system |
| CN108490293A (en) * | 2018-03-23 | 2018-09-04 | 天津职业技术师范大学 | A kind of detection circuit and control method of three-phase inverter |
| CN109254200A (en) * | 2018-11-16 | 2019-01-22 | 美钻深海能源科技研发（上海）有限公司 | For detecting the isolated DC voltage sensor of DC24V voltage stability |
| CN111220837A (en) * | 2018-11-26 | 2020-06-02 | 宝山钢铁股份有限公司 | Output voltage detector of broadband PWM frequency converter |
| CN112285537A (en) * | 2020-10-28 | 2021-01-29 | 南京科远驱动技术有限公司 | Circuit and method for self-diagnosis of main circuit of frequency converter |
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Address after: 264006, 11, the Yellow River Road, Yantai economic and Technological Development Zone, Shandong, China Applicant after: EURA Drives Electric Co., Ltd. Address before: 264006, 11, the Yellow River Road, Yantai economic and Technological Development Zone, Shandong, China Applicant before: Eura Drives Electric Co., Ltd. |
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Application publication date: 20111214 |