CN105406444A - Zero-cross detection circuit - Google Patents
Zero-cross detection circuit Download PDFInfo
- Publication number
- CN105406444A CN105406444A CN201510805188.1A CN201510805188A CN105406444A CN 105406444 A CN105406444 A CN 105406444A CN 201510805188 A CN201510805188 A CN 201510805188A CN 105406444 A CN105406444 A CN 105406444A
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- CN
- China
- Prior art keywords
- module
- detection circuit
- cross detection
- zero cross
- current
- Prior art date
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
Abstract
The invention discloses a zero-cross detection circuit. Voltage-withstanding tubes of a sampling circuit are a PMOS (P-channel Metal Oxide Semiconductor) tube and an NMOS (N-channel Metal Oxide Semiconductor) tube, so that the problem of short service life due to high voltage damage can be solved. The zero-cross detection circuit also comprises a current bias module; the phenomenon of great errors caused by the influence of channel length modulation effect on the mirror current can be reduced; a current comparator is set into a two-stage current comparator; a cascade device is inserted in a first stage circuit; the gain can be improved, and meanwhile, great oscillation amplitude can be realized; the lead of the zero-cross detection circuit is 48 to 50mA; the stability and the identification sensitivity of a system can be improved; the work efficiency can be improved; and the application value is very high.
Description
Technical field
The present invention relates to and belong to LED circuit field, be specifically related to a kind of zero cross detection circuit.
Background technology
Switching Power Supply managing chip has in LED product to be applied very widely, and small size, low-power consumption, high efficiency, light weight, low cost and high reliability become the main trend of Switching Power Supply development.Current detection circuit is an important composition module of power management chip, and its Main Function detects the electric current on some components and parts or circuit, the signal detected
In order to feed back in system protection and the control circuit system of being used for, current detection technology all plays very important effect in power management chip and the application of other electrical type.Current DC/DC zero cross detection circuit also exists the problem that poor stability is low, discrimination threshold is low.
Summary of the invention
The object of the present invention is to provide a kind of zero cross detection circuit.
For achieving the above object, the invention provides following technical scheme: a kind of zero cross detection circuit, described drive circuit comprises sampling module, rectification module, comparison module and protection module, described sampling module is connected with rectification module, described sampling module is the sample circuit formed between pressure pipe, by sample circuit, sample detecting is carried out to the voltage of synchronous rectifier drain terminal, described rectification module is that the voltage transitions detected by sampling module becomes current signal, described rectification module is connected with comparison module, described comparison module is the current comparator formed between pressure pipe, electric current after rectification is detected, decision circuitry was in nought state or high pressure conditions, described comparison module is also connected with protection module, when zero cross detection circuit detects that inductive current is zero, described protection module turns off synchronous rectifier in time and protects circuit.
Preferably, the pressure pipe of described sample circuit is PMOS and NMOS tube.
Preferably, described zero cross detection circuit also comprises current offset module, and described current offset module is connected with sampling module.
Preferably, described current offset module Bian cascodes.
Preferably, described current comparator is set to two-stage current comparator, and inserts source gate device in first order circuit.
Preferably, the lead of described zero cross detection circuit is 48-50mA.
The beneficial effect of above technical scheme is adopted to be: to the invention provides a kind of zero cross detection circuit, the pressure pipe of described sample circuit is PMOS and NMOS tube, can reduce because high pressure damages the problem causing the life-span short, described zero cross detection circuit also comprises current offset module, the electric current of channel-length modulation to mirror image can be reduced have an impact, thus cause the phenomenon producing maximum error, described current comparator is set to two-stage current comparator, and cascade device is inserted in first order circuit, the very large amplitude of oscillation can be had while raising gain, the lead of described zero cross detection circuit is 48-50mA, stability and the discrimination threshold of system can be improved, work can be improved there is very high using value.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention.
Fig. 2 is the circuit diagram of two stage comparator.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
embodiment
A kind of zero cross detection circuit, described drive circuit comprises sampling module, rectification module, comparison module and protection module, described sampling module is connected with rectification module, described sampling module is the sample circuit formed between pressure pipe, by sample circuit, sample detecting is carried out to the voltage of synchronous rectifier drain terminal, described rectification module is that the voltage transitions detected by sampling module becomes current signal, described rectification module is connected with comparison module, described comparison module is the current comparator formed between pressure pipe, electric current after rectification is detected, decision circuitry was in nought state or high pressure conditions, described comparison module is also connected with protection module, when zero cross detection circuit detects that inductive current is zero, described protection module turns off synchronous rectifier in time and protects circuit.
The pressure pipe of described sample circuit is PMOS and NMOS tube, described zero cross detection circuit also comprises current offset module, described current offset module is connected with sampling module, described current offset module Bian source grid structure, described current comparator is set to two-stage current comparator, and inserts cascade device in first order circuit.The first order provides high gain, the second level provides the large amplitude of oscillation, obtains higher gain.The extraordinary stability of a system and very high discrimination threshold, the lead of described zero cross detection circuit is 49mA.
The operation principle of DC/DC zero cross detection circuit: PMOS and NMOS tube form electric current Bian sample circuit, sample detecting is carried out to the voltage of synchronous rectifier drain terminal, synchronous rectifier drain terminal voltage transitions is become current signal by rectification module, the two stage comparator of PMOS, NMOS tube and cascade device composition simultaneously, compare the current signal detected is capable, to judge inductance freewheel current whether zero passage.
The invention provides a kind of zero cross detection circuit, the pressure pipe of described sample circuit is PMOS and NMOS tube, can reduce because high pressure damages the problem causing the life-span short, described zero cross detection circuit also comprises current offset module, the electric current of channel-length modulation to mirror image can be reduced have an impact, thus cause the phenomenon producing maximum error, described current comparator is set to two-stage current comparator, and cascade device is inserted in first order circuit, the very large amplitude of oscillation can be had while raising gain, the lead of described zero cross detection circuit is 48-50mA, stability and the discrimination threshold of system can be improved, work can be improved there is very high using value.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1. a zero cross detection circuit, it is characterized in that, described drive circuit comprises sampling module, rectification module, comparison module and protection module, described sampling module is connected with rectification module, described sampling module is the sample circuit formed between pressure pipe, by sample circuit, sample detecting is carried out to the voltage of synchronous rectifier drain terminal, described rectification module is that the voltage transitions detected by sampling module becomes current signal, described rectification module is connected with comparison module, described comparison module is the current comparator formed between pressure pipe, electric current after rectification is detected, decision circuitry was in nought state or high pressure conditions, described comparison module is also connected with protection module, when zero cross detection circuit detects that inductive current is zero, described protection module turns off synchronous rectifier in time and protects circuit.
2. a kind of zero cross detection circuit according to claim 1, is characterized in that: the pressure pipe of described sample circuit is PMOS and NMOS tube.
3. a kind of zero cross detection circuit according to claim 1, is characterized in that: described zero cross detection circuit also comprises current offset module, described current offset module is connected with sampling module.
4. a kind of zero cross detection circuit according to claim 3, is characterized in that: described current offset module Bian source grid structure.
5. according to claim 1 a kind of zero cross detection circuit, it is characterized in that: described current comparator is set to two-stage current comparator, and insert cascade device in first order circuit.
6. a kind of zero cross detection circuit according to claim 1, is characterized in that: the lead of described zero cross detection circuit is 48-50mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805188.1A CN105406444A (en) | 2015-11-20 | 2015-11-20 | Zero-cross detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805188.1A CN105406444A (en) | 2015-11-20 | 2015-11-20 | Zero-cross detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105406444A true CN105406444A (en) | 2016-03-16 |
Family
ID=55471769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510805188.1A Pending CN105406444A (en) | 2015-11-20 | 2015-11-20 | Zero-cross detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105406444A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807125A (en) * | 2016-05-20 | 2016-07-27 | 深圳芯智汇科技有限公司 | Zero-crossing detection circuit and switching power supply including same |
| CN106199156A (en) * | 2016-06-23 | 2016-12-07 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106291077A (en) * | 2016-07-14 | 2017-01-04 | 重庆恒又源科技发展有限公司 | Zero cross detection circuit |
| CN117176126A (en) * | 2023-11-02 | 2023-12-05 | 江苏捷捷微电子股份有限公司 | Multifunctional silicon controlled rectifier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128973A (en) * | 2010-01-19 | 2011-07-20 | 深圳艾科创新微电子有限公司 | Voltage zero-crossing detecting circuit and DC-DC converter with same |
| CN102778602A (en) * | 2012-07-27 | 2012-11-14 | 电子科技大学 | Zero-cross detection circuit |
| CN104034953A (en) * | 2014-06-18 | 2014-09-10 | 许昌学院 | Current zero crossing detection circuit for BUCK type synchronous rectification converter |
-
2015
- 2015-11-20 CN CN201510805188.1A patent/CN105406444A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128973A (en) * | 2010-01-19 | 2011-07-20 | 深圳艾科创新微电子有限公司 | Voltage zero-crossing detecting circuit and DC-DC converter with same |
| CN102778602A (en) * | 2012-07-27 | 2012-11-14 | 电子科技大学 | Zero-cross detection circuit |
| CN104034953A (en) * | 2014-06-18 | 2014-09-10 | 许昌学院 | Current zero crossing detection circuit for BUCK type synchronous rectification converter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807125A (en) * | 2016-05-20 | 2016-07-27 | 深圳芯智汇科技有限公司 | Zero-crossing detection circuit and switching power supply including same |
| CN106199156A (en) * | 2016-06-23 | 2016-12-07 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106199156B (en) * | 2016-06-23 | 2018-10-26 | 电子科技大学 | A kind of exchange commutation detection circuit |
| CN106291077A (en) * | 2016-07-14 | 2017-01-04 | 重庆恒又源科技发展有限公司 | Zero cross detection circuit |
| CN117176126A (en) * | 2023-11-02 | 2023-12-05 | 江苏捷捷微电子股份有限公司 | Multifunctional silicon controlled rectifier |
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Application publication date: 20160316 |