CN203104293U - Switching power supply and switching power supply integrated circuit - Google Patents
Switching power supply and switching power supply integrated circuit Download PDFInfo
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- CN203104293U CN203104293U CN 201220710850 CN201220710850U CN203104293U CN 203104293 U CN203104293 U CN 203104293U CN 201220710850 CN201220710850 CN 201220710850 CN 201220710850 U CN201220710850 U CN 201220710850U CN 203104293 U CN203104293 U CN 203104293U
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- power supply
- switching power
- integrated circuit
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- passage detection
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Abstract
The utility model provides a switching power supply integrated circuit, which comprises a power switch module and a switching power supply control module. The switching power supply integrated circuit further comprises a single-end alternating current zero crossing detection module which comprises a zero crossing detection module and a driving unit. The zero crossing detection unit is connected with an AC power supply and produces a zero crossing detection signal after detecting a zero crossing point of the AC power supply, and the zero crossing detection unit comprises a detection end and an output end, wherein the detection end of the zero crossing unit is connected with the AC power supply. The driving unit comprises an input end and an output end, wherein the input end of the driving unit is connected with the output end of the zero crossing detection unit, the driving unit receives the zero crossing detection signal, and the output end of the driving unit outputs a zero crossing driving signal. The utility model further provides a switching power supply. The switching power supply and the switching power supply integrated circuit can reduce loss of zero crossing detection of the AC power supply, conforms to energy saving standards, and can accurately detect the zero crossing point of a switching power supply provided with a half-wave rectifying circuit.
Description
Technical field
The utility model relates to Switching Power Supply, relates in particular to a kind of have Switching Power Supply integrated circuit and Switching Power Supply.
Background technology
In household electrical appliances and electrical equipment control field, can prolong the life-span of relay usually for the switching stress that reduces relay, employing is only carried out switch motion at the zero crossing of alternating current to relay, and the zero crossing that therefore detects alternating current is one of necessary function design of circuit.In the tradition application of using Industrial Frequency Transformer as power supply, can obtain the crossover point signal of alternating current easily from transformer secondary output.
But along with improving constantly of energy-conservation requirement, Switching Power Supply begins progressively to replace the main power supply source of Industrial Frequency Transformer as electrical equipment, and this moment, the primary side of power supply can't directly detect the zero crossing information of alternating current, therefore needs to propose the new detection method at zero point.
Early stage in the application of Switching Power Supply, people generally use an optocoupler to get zero signal and be delivered to secondary control circuit by optocoupler in the mode of isolating from alternating current wires by a resistance pressure-dividing network series connection, but be subject to the sensitivity of optocoupler, make above-mentioned resistor voltage divider network in the process that detects, produce great power consumption, generally can reach more than the 0.4W, system's complete machine stand-by power consumption is therefore all more than 0.5W.At present, countries in the world are all implemented new 0.5W stand-by energy-saving standard successively, use this kind system and method can't reach the stand-by energy-saving standard if therefore continue.
The utility model content
The technical problems to be solved in the utility model is to overcome above-mentioned the problems of the prior art, and a kind of have Switching Power Supply integrated circuit and Switching Power Supply are proposed, by the active detecting of zero crossing is come the secondary circuit of control switching, can solve effectively energy consumption too high, can't meet problems such as energy conservation standard.
For solving the problems of the technologies described above, the utility model proposes a kind of Switching Power Supply integrated circuit that has, the Switching Power Supply integrated circuit comprises power switch module and Switching Power Supply control module, it also comprises single-ended alternating current zero passage detection module, single-ended alternating current zero passage detection module comprises: the zero passage detection unit, the zero passage detection unit connects AC power, the zero passage detection unit produces the zero passage detection signal after detecting the zero crossing of AC power, the zero passage detection unit comprises test side and output, and the test side of zero passage detection unit connects AC power; And driver element, comprising input and output, the input of driver element connects the output of zero passage detection unit, and driver element receives the zero passage detection signal, the output output zero passage drive signal of driver element.
Preferably, the zero passage detection unit comprises zero-crossing comparator, an end ground connection of zero-crossing comparator or connect reference voltage, and the other end of zero-crossing comparator is the test side of zero passage detection unit, the output of zero-crossing comparator is the output of zero passage detection unit.
Preferably, driver element comprises triode or field effect transistor, the base stage of triode or the grid of field effect transistor are the input of driver element, and the collector electrode of triode or the drain electrode of field effect transistor are the output of driver element, the emitter of triode or the source ground of field effect transistor.
Preferably, the encapsulation of Switching Power Supply integrated circuit comprises that alternating current detects pin and zero cross signal output pin, the test side of zero cross signal is that the alternating current of Switching Power Supply integrated circuit detects pin, and the output of driver element is the zero cross signal output pin of Switching Power Supply integrated circuit.
Preferably, the packing forms of Switching Power Supply integrated circuit is DIP8 or SOP8.
Preferably, the power switch module is triode or metal-oxide-semiconductor.
Preferably, the withstand voltage scope of power switch module is 200V-1000V.
The utility model also proposes a kind of Switching Power Supply, comprise optical coupler, half-wave rectifying circuit, first resistance, transformer and aforesaidly have a Switching Power Supply integrated circuit, half-wave rectifying circuit comprises diode, optical coupler comprises two inputs, and the Switching Power Supply integrated circuit also comprises the circuit supply pin; First resistance is connected the anode of diode and the alternating current of Switching Power Supply integrated circuit detects between the pin, the zero cross signal output pin of Switching Power Supply integrated circuit connects an input of optical coupler, the circuit supply pin connects external power source, another input of optical coupler connects external power source, the anode of diode connects AC power, the negative electrode of diode connects an end of transformer, and the power switch module connects the other end of transformer.
Compared with prior art, the beneficial effects of the utility model comprise: of the present utility model have Switching Power Supply integrated circuit and a Switching Power Supply, by zero passage detection unit and driver element are integrated in the circuit, Synchronization Control optical coupler in real time, thereby be reduced in the power loss in the zero passage detection, meet the stand-by energy-saving standard, can accurately measure the zero crossing of Switching Power Supply with half-wave rectifying circuit.
Description of drawings
Fig. 1 is the circuit structure diagram of the preferred embodiment of Switching Power Supply of the present utility model.
Fig. 2 is the schematic diagram of the Switching Power Supply integrated circuit among Fig. 1.
Fig. 3 is the circuit structure diagram of another preferred embodiment of Switching Power Supply of the present utility model.
Fig. 4 is the schematic diagram of the Switching Power Supply integrated circuit among Fig. 3.
Wherein, description of reference numerals is as follows: have Switching Power Supply integrated circuit 1 single-ended alternating current zero passage detection module 11 zero passage detection unit 111 driver elements, 112 power switch modules, 12 Switching Power Supply control modules, 13 optical coupler IC1, first resistance R, 1 absorption circuit RDC half-wave rectifying circuit, 2 diode D1 reference power source VERF transformer T.
Embodiment
In order to further specify principle of the present utility model and structure, now in conjunction with the accompanying drawings preferred embodiment of the present utility model is elaborated.
See also Fig. 1 to Fig. 4, a kind of Switching Power Supply integrated circuit 1 that has of the present utility model, it comprises: single-ended alternating current zero passage detection module 11, power switch module 12 and Switching Power Supply control module 13.The function that general Switching Power Supply integrated circuit does not all have the grid alternating current zero crossing to detect, and the utility model integrated this function, and do not need extra components and parts.
Single-ended alternating current zero passage detection module 11 comprises zero passage detection unit 111 and driver element 112.Zero passage detection unit 111 connects AC power, and driver element 112 connects zero passage detection unit 111.Zero passage detection unit 111 produces the zero passage detection signal after detecting the zero crossing of AC power, and driver element 112 receives the zero passage detection signals, driver element 112 output zero passage drive signals.
Zero passage detection unit 111 comprises test side and output.See also Fig. 2, in the present embodiment, zero passage detection unit 111 comprises zero-crossing comparator, the in-phase end ground connection of zero-crossing comparator, the out-phase end of zero-crossing comparator is the test side of zero passage detection unit 111, and the output of zero-crossing comparator is the output of zero passage detection unit 111.
See also Fig. 3, in other embodiments, zero passage detection unit 111 comprises zero-crossing comparator, the homophase termination reference power source VERF of zero-crossing comparator, the out-phase end of zero-crossing comparator is the test side of zero passage detection unit 111, and the output of zero-crossing comparator is the output of zero passage detection unit 111.This reference power source VERF can be provided with according to the demand of secondary control circuit.If the out-phase termination reference power source VERF of this zero-crossing comparator, then this zero passage detection unit 111 has had the size detection function of alternating current.Be specially; the operating voltage range of secondary control circuit is set by this reference power source VERF; when the size that detects the alternating current that flows through first resistance R 1 is not in the operating voltage range of setting; do not export the zero passage detection signal, thereby secondary control circuit can obtain the size parameter of alternating current indirectly and implement such as functions such as overvoltage protection, under-voltage protection or switch controls.
Please continue to consult Fig. 2 and Fig. 3, driver element 112 comprises input and output.In the present embodiment, driver element 112 comprises triode, and the base stage of triode is the input of this driver element 112, and the current collection of triode is the output of this driver element 112 very, the grounded emitter of triode.Because zero cross signal is smaller, can be amplified to the scope that can drive optical coupler IC1 work to zero cross signal by triode, thereby makes optical coupler IC1 work.In other embodiments, driver element 112 comprises field effect transistor, and the grid of field effect transistor is the input of driver element, and the drain electrode of field effect transistor is the output of driver element, the source ground of field effect transistor.
See also Fig. 4, Switching Power Supply integrated circuit 1 is by integrated power switch module 12, Switching Power Supply control module 13 and have single-ended alternating current zero passage detection module 11, so just no longer need extra components and parts, and have few peripheral quantity, make integrated cost reduce.
In the present embodiment, this Switching Power Supply integrated circuit 1 be encapsulated as DIP8 or SOP8.The pin two of this Switching Power Supply integrated circuit 1 is that alternating current detects pin, pin 3 is that Switching Power Supply integrated circuit 1 is with reference to grounding pin, pin 4 is Switching Power Supply integrated circuit 1 energization pins, pin 5 is the zero cross signal output pin, and pin 7 and pin 8 are power switch module 12 pins.It is two test sides of zero passage detection unit 111 that alternating current detects pin, and the signal output pin is the output of driver element 112.Pin number and Pin locations that this Switching Power Supply integrated circuit 1 needs to use can be set according to actual conditions, are not limited to the situation of present embodiment.See also Fig. 4, also can adopt the encapsulation of having only 5 pins,, therefore, need only 5 pins and just can enough realize the function of present embodiment because pin 7 and pin 8 connect together.
In the present embodiment, Switching Power Supply control module 13 is the PWM(pulse-width modulation circuit), PFM(pulse frequency modulation circuit) or PSM(pulse number modulation circuit).The voltage tolerance range of power switch module 12 is 200V-1000V.Power switch module 12 is triode or metal-oxide-semiconductor.
Please continue to consult Fig. 1 and Fig. 4, the utility model also proposes a kind of Switching Power Supply, Switching Power Supply is applied to electric power system, it comprises optical coupler IC1, half-wave rectifying circuit 2, first resistance R 1, transformer T and aforesaid Switching Power Supply integrated circuit 1, half-wave rectifying circuit 2 comprises diode D1, and optical coupler IC1 comprises two inputs.First resistance R 1 is connected the anode of diode D1 and the alternating current of Switching Power Supply integrated circuit 1 detects between the pin, and the zero cross signal output pin of Switching Power Supply integrated circuit 1 connects the input of optical coupler IC1.Switching Power Supply integrated circuit 1 also comprises the circuit supply pin, and the circuit supply pin connects external power source, and the other end of optical coupler IC1 connects external power source.The anode of diode D1 connects AC power, and the negative electrode of diode D1 connects the end of transformer T, and power switch module 12 connects the other end of transformer T, and absorption circuit RDC is in parallel with transformer T.
As we can see from the figure, the power supply of optical coupler IC1 also can need not extra power supply by the external power source of Switching Power Supply integrated circuit 1.The power supply that is indebted to our Switching Power Supply integrated circuit 1 generally has only about 5-10V, therefore there is electric current to carry out the optocoupler driving up to 5mA, thereby reduce the sensitivity requirement of optocoupler, make optical coupler IC1 to be activated sooner, reduced the start-up time of optical coupler IC1.And maximum loss power reduces more than 10 times than traditional method only below the 5mW, has saved the energy.
Describe operation principle of the present utility model in detail below in conjunction with Fig. 1 to Fig. 4.
The crossover point signal of alternating current enters into control switching integrated circuit 1 inside through first resistance R 1, after the processing and analysis of zero passage detecting unit 111, produces the zero passage detection signal.If zero passage detection unit 111 connects reference power source VERF, then detect flow through first resistance R 1 size of current whether in scope is set, if then this zero passage detection signal is sent to this driver element 112, otherwise do not transmit; If zero passage detection unit 111 ground connection then detect zero crossing, just zero cross signal is sent to driver element 112.Driver element 112 is if receive zero cross signal, with regard to output drive signal, and carries out Synchronization Control to being connected outside optical coupler IC1.The zero crossing detection signal through optical coupler IC1 with isolation method be delivered to secondary after, the Control work that can implement to be correlated with can accurately be measured the zero crossing of the Switching Power Supply with half-wave rectifying circuit.
Compared with prior art, adopt have Switching Power Supply integrated circuit and Switching Power Supply of the present utility model, by zero passage detection unit and driver element are integrated in the circuit, do not need extra components and parts, reduced production cost, and because analysis zero-crossing of alternating current that can be initiatively, do not need extra can real-time output AC signal than power consumption to secondary control circuit, make the complete machine stand-by power consumption easily to be controlled at below the 0.5W, even below the 0.3W, meet present stand-by energy-saving standard, simultaneously, because reduced the sensitivity requirement of optical coupler, improved toggle speed.
The above only is a preferable possible embodiments of the present utility model, and unrestricted protection range of the present utility model.The equivalent structure that all utilization the utility model specifications and accompanying drawing content have been done changes, and all is included in the protection range of the present utility model.
Claims (8)
1. Switching Power Supply integrated circuit, described Switching Power Supply integrated circuit comprises power switch module and Switching Power Supply control module, it is characterized in that, and it also comprises single-ended alternating current zero passage detection module, and described single-ended alternating current zero passage detection module comprises:
The zero passage detection unit, described zero passage detection unit connects AC power, described zero passage detection unit produces the zero passage detection signal after detecting the zero crossing of described AC power, described zero passage detection unit comprises test side and output, and the test side of described zero passage detection unit connects described AC power; And
Driver element comprises input and output, and the input of described driver element connects the output of described zero passage detection unit, and described driver element receives described zero passage detection signal, the output output zero passage drive signal of described driver element.
2. Switching Power Supply integrated circuit as claimed in claim 1, it is characterized in that, described zero passage detection unit comprises zero-crossing comparator, one end ground connection of described zero-crossing comparator or connect reference voltage, the other end of described zero-crossing comparator is the test side of described zero passage detection unit, and the output of described zero-crossing comparator is the output of described zero passage detection unit.
3. Switching Power Supply integrated circuit as claimed in claim 1, it is characterized in that, described driver element comprises triode or field effect transistor, the base stage of described triode or the grid of field effect transistor are the input of described driver element, the collector electrode of described triode or the drain electrode of field effect transistor are the output of described driver element, the emitter of described triode or the source ground of field effect transistor.
4. Switching Power Supply integrated circuit as claimed in claim 1, it is characterized in that, the encapsulation of described Switching Power Supply integrated circuit comprises that alternating current detects pin and zero cross signal output pin, the test side of described zero cross signal is that the alternating current of described Switching Power Supply integrated circuit detects pin, and the output of described driver element is the zero cross signal output pin of described Switching Power Supply integrated circuit.
5. Switching Power Supply integrated circuit as claimed in claim 4 is characterized in that, the packing forms of described Switching Power Supply integrated circuit is DIP8 or SOP8.
6. Switching Power Supply integrated circuit as claimed in claim 1 is characterized in that, described power switch module is triode or metal-oxide-semiconductor.
7. Switching Power Supply integrated circuit as claimed in claim 6 is characterized in that, the withstand voltage scope of described power switch module is 200V-1000V.
8. Switching Power Supply, it is characterized in that, comprise optical coupler, half-wave rectifying circuit, first resistance, transformer and describedly have a Switching Power Supply integrated circuit as any one of claim 1 to 7, described half-wave rectifying circuit comprises diode, described optical coupler comprises two inputs, and described Switching Power Supply integrated circuit also comprises the circuit supply pin;
Described first resistance is connected the anode of described diode and the alternating current of described Switching Power Supply integrated circuit detects between the pin, the zero cross signal output pin of described Switching Power Supply integrated circuit connects an input of described optical coupler, described circuit supply pin connects external power source, another input of described optical coupler connects described external power source, the anode of described diode connects described AC power, the negative electrode of described diode connects an end of described transformer, and described power switch module connects the other end of described transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710850 CN203104293U (en) | 2012-12-20 | 2012-12-20 | Switching power supply and switching power supply integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710850 CN203104293U (en) | 2012-12-20 | 2012-12-20 | Switching power supply and switching power supply integrated circuit |
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| Publication Number | Publication Date |
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| CN203104293U true CN203104293U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220710850 Expired - Lifetime CN203104293U (en) | 2012-12-20 | 2012-12-20 | Switching power supply and switching power supply integrated circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887998A (en) * | 2012-12-20 | 2014-06-25 | 深圳市力生美半导体器件有限公司 | Switch power source and switch power source integration circuit |
| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
| WO2018205370A1 (en) * | 2017-05-12 | 2018-11-15 | 厦门赛特勒磁电有限公司 | Power conversion module |
| CN114002491A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Zero point detection circuit and clutter detection system |
-
2012
- 2012-12-20 CN CN 201220710850 patent/CN203104293U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887998A (en) * | 2012-12-20 | 2014-06-25 | 深圳市力生美半导体器件有限公司 | Switch power source and switch power source integration circuit |
| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
| CN104578722B (en) * | 2014-12-30 | 2019-09-13 | 上海贝岭股份有限公司 | The zero cross detection circuit of inductive current in a kind of power switch chip |
| WO2018205370A1 (en) * | 2017-05-12 | 2018-11-15 | 厦门赛特勒磁电有限公司 | Power conversion module |
| CN114002491A (en) * | 2021-10-29 | 2022-02-01 | 公牛集团股份有限公司 | Zero point detection circuit and clutter detection system |
| CN114002491B (en) * | 2021-10-29 | 2024-03-01 | 公牛集团股份有限公司 | Zero detection circuit and clutter detection system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 518000, Shenzhen, Guangdong Province, Nanshan District science and technology road, 1, SED science and technology building on the south side of the 10 floor, block A Patentee after: LII SEMICONDUCTOR Inc. Address before: Longgang District of Shenzhen City, Guangdong province 518000 Longgang Street Baolong Community Road No. 2 JINGDING Building No. 1 201~202 science and technology industrial plant Patentee before: SHENZHEN LII SEMICONDUCTOR DEVICES Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130731 |
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| CX01 | Expiry of patent term |