CN103683942A - Power converter - Google Patents
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- CN103683942A CN103683942A CN201410009003.1A CN201410009003A CN103683942A CN 103683942 A CN103683942 A CN 103683942A CN 201410009003 A CN201410009003 A CN 201410009003A CN 103683942 A CN103683942 A CN 103683942A
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Abstract
The invention relates to a power converter which is characterized by comprising a rectifier filter circuit, a power circuit, an output voltage error signal feedback circuit, a pulse-width modulation (PWM) controller, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a transformer, a switch and a resistor R32; two acquired circuits of signals are processed by the output voltage error signal feedback circuit and the error feedback signal of output voltage is obtained and input into the PWM controller so as to change the duty ratio, so that the purpose that the primary control output of the power converter is stable is achieved. Due to the adoption of the control circuit, photoelectric couplers which are used for isolating transmitted and output error signals between the auxiliary power supply windings as well as between the primary levels of the power converter are omitted, so that the process of the transformer is simplified, the manufacturability and reliability are improved, the safety related elements and devices of the power supply are simplified, the safety is improved, and the power cost is reduced.
Description
Technical field
The control technology field that the present invention relates to electronic circuit, specifically relates to a kind of supply convertor.
Background technology
At present, the error signal feedback model of supply convertor control output voltage stabilization is known three kinds:
The first feedback model is well-knownly between supply convertor primary and secondary, with photoelectrical coupler, to carry out transmission error negative-feedback signal, shortcoming is that the other error amplifying circuit of the secondary needs of supply convertor and auxiliary power supply circuit are transferred to supply convertor primary control circuit change duty cycle of switching by output voltage error signal by photoelectrical coupler, thereby regulated output voltage, cause supply convertor circuit complicated, cost is high, and photoelectrical coupler has withstand voltage and restriction creepage distance, personal safety is had to impact;
The primary that another kind of feedback model is known supply convertor arranges auxiliary winding, auxiliary winding provides the feedback signal of output voltage and is the control circuit power supply of supply convertor, this feedback model shortcoming is to need other winding, cause transformer complex process, cost is high, and is unfavorable for automatic mass production;
The third feedback model is directly to utilize the armature winding of the transformer of supply convertor to feed back output voltage error signal as feedback winding, this feedback model is because armature winding voltage reversal when switch cuts out of transformer, the proportional relation of this reverse voltage and output voltage, reverse voltage is that to take the high direct voltage bus of supply convertor be reference, and the control circuit of supply convertor is that to take direct current be reference, therefore, need to use high pressure adjustable constant-flow source detects by feedback winding the output voltage error signal coming and is converted to current direction direct current ground, between high pressure adjustable constant-flow source and ground, access resistance, ohmically change in voltage reflects that by ratio output voltage changes.This feedback model shortcoming is to need high pressure adjustable constant-flow source, and therefore, the encapsulation of control circuit need to be used high pressure manufacturing process, and cost is high, also makes the reliability of supply convertor decrease.
In sum, above several feedback models are Shortcomings all, therefore, must study another feedback model and overcome above deficiency.
Summary of the invention
The object of the present invention is to provide a kind of auxiliary power supply winding of removing supply convertor and remove between supply convertor primary and secondary for isolating the supply convertor of the photoelectrical coupler that transmits output error signal, this supply convertor has been simplified transformer technique, manufacturability and reliability have been improved, simplify the security-related components and parts of power supply, improve fail safe, reduce power supply cost.
In order to realize foregoing invention object, a kind of technical scheme that the present invention adopts is:
A kind of supply convertor, comprise current rectifying and wave filtering circuit, power circuit, output voltage error signal feedback circuit, PWM controller, resistance R 14, resistance R 15, resistance R 16, resistance R 17, transformer, switch and resistance R 32, wherein, the output of current rectifying and wave filtering circuit is electrically connected to the input of the primary coil of transformer, after being connected in series with switch and resistance R 32 successively, the output of the primary coil of transformer is electrically connected to ground GND, the output of output voltage error signal feedback circuit is connected with the feedback end of PWM controller, error feedback signal is fed back to PWM controller, the switch controlling signal output of the input of output voltage error signal feedback circuit and PWM controller is connected, the switching signal of the drive output of the output switching signal of switch controlling signal output and PWM controller is synchronous, PWM controller sends driving signal to switch from drive output, one end of series connection bleeder circuit and the output plus terminal of current rectifying and wave filtering circuit of resistance R 14 and resistance R 15 are electrically connected to, and the other end is electrically connected to the output negative terminal of current rectifying and wave filtering circuit, one end of the series connection bleeder circuit of resistance R 16 and resistance R 17 is electrically connected to the primary coil output of transformer, the other end is electrically connected to ground GND, the input of output voltage error signal feedback circuit is electrically connected to the tie point between resistance R 14 and resistance R 15, the voltage VA value of the output plus terminal that obtains current rectifying and wave filtering circuit at input after to the direct voltage dividing potential drop of the output negative terminal of current rectifying and wave filtering circuit, another input of output voltage error signal feedback circuit is electrically connected to the tie point between resistance R 16 and resistance R 17, the voltage VB value of the armature winding tie point of switch and transformer after to the voltage dividing potential drop of GND when input obtains switch and opens and close.
Described output voltage error signal feedback circuit is by buffering input circuit, sampling hold circuit, Buffer output circuit, inverter, sampling time circuit and subtracter form, when the switch collecting opens and cuts out, the voltage VB value of the armature winding tie point of switch and transformer after to the voltage dividing potential drop of GND sends buffering input circuit to through input, buffering input circuit sends voltage signal to sampling hold circuit, after the time delay and Timing Processing of switch controlling signal that the input of output voltage error signal feedback circuit receives and sampling time circuit anti-phase through inverter, send sampling hold circuit to, sampling hold circuit is input to the magnitude of voltage of collection an input of subtracter after maintenance a period of time, the voltage VA value of the output plus terminal that voltage VB value deducts the current rectifying and wave filtering circuit that another input of subtracter collects after to the direct voltage dividing potential drop of the output negative terminal of current rectifying and wave filtering circuit, the output output of subtracter be the magnitude of voltage with the proportional relation of output voltage, the feedback end that this magnitude of voltage is input to PWM controller goes by-pass cock duty ratio.
Described switch is transistor or field effect transistor.
Described power circuit comprises ac buck electric capacity, filter capacitor, rectification circuit, voltage stabilizing circuit, ac buck capacitance series is at the input of rectification circuit, rectification circuit is electrically connected to voltage stabilizing circuit with after filter capacitor parallel connection, the both end voltage of filter capacitor maintains lower voltage and is input to voltage stabilizing circuit, and starting current and the operating current of output voltage error signal feedback circuit and PWM controller is provided.
Owing to adopting above technical scheme, supply convertor of the present invention is removed the auxiliary power supply winding of transformer, has simplified the manufacturing process of transformer, improves manufacturability and reliability, saves material, reduces costs.
Owing to adopting above technical scheme, supply convertor of the present invention has been removed between supply convertor primary and secondary for isolating the photoelectrical coupler that transmit output error signal, simplifies the security-related components and parts of power supply, improves fail safe, reduction power supply cost.
Owing to adopting above technical scheme, the control circuit part of supply convertor of the present invention, without adopting high withstand voltage components and parts, has improved safety and reliability, reduces material cost.
Accompanying drawing explanation
Fig. 1 is according to the circuit structure block diagram of a kind of execution mode of supply convertor primary control output circuit of the present invention.
Fig. 2 is the circuit structure block diagram of the output voltage error signal feedback circuit shown in Fig. 1.
Fig. 3 is the circuit structure block diagram of the power circuit shown in Fig. 1.
Embodiment
For the ease of those skilled in the art will recognize that below in conjunction with specific embodiment and accompanying drawing, technical scheme of the present invention is described in further detail.
At this, detailed example embodiment is disclosed.Yet concrete structure disclosed herein and function detail are only used to describe the object of example embodiment.Yet, can in many replacement forms, realize example embodiment, and should not be regarded as the example embodiment that only limits to illustrate at this.
Yet, should be appreciated that, be not limited to disclosed concrete example embodiment, but on the contrary, example embodiment falls into all modifications, equivalent and the alternative in the scope of the present disclosure by covering.The description that spreads all over accompanying drawing, similar label relates to similar element.
Should be appreciated that, although first, second grade of term is used as and describes different elements at this, these elements can not limited by these terms.These terms are only for differentiating an element and another element.For example, the first element can be called as the second element, and similarly, the second element can be called as the first element and not deviate from the scope of example embodiment.As used in this, term "and/or" comprises one or more relevant any and all combinations of listing item.
Should be appreciated that, when element is called as " connection " or " coupling " to another element, it can be directly connected or coupled to other elements, or can have intermediary element.On the contrary, when element is called as " directly connection " or " directly coupling " to another element, there is not intermediary element.Other words that are used for describing relation between element should understand according to identical mode (for example, " and between " to " directly between ", " adjacent " to " direct neighbor " etc.).
As shown in Figure 1, a kind of supply convertor, comprise current rectifying and wave filtering circuit 4, power circuit 11, output voltage error signal feedback circuit 20, PWM controller 27, resistance R 14, resistance R 15, resistance R 16, resistance R 17, transformer 38, switch 34 and resistance R 32, wherein, the output of current rectifying and wave filtering circuit 4 is electrically connected to the input of the primary coil of transformer 38, after being connected in series with switch 34 and resistance R 32 successively, the output of the primary coil of transformer 38 is electrically connected to ground GND, the output 24 of output voltage error signal feedback circuit 20 is connected with the feedback end 26 of PWM controller 27, error feedback signal is fed back to PWM controller 27, the input 23 of output voltage error signal feedback circuit 20 is connected with the switch controlling signal output 25 of PWM controller, the switching signal of the drive output 30 of the output switching signal of switch controlling signal output 25 and PWM controller 27 is synchronous, PWM controller 27 sends driving signal to switch 34 from drive output 30, one end of the series connection bleeder circuit of resistance R 14 and resistance R 15 is electrically connected to the output plus terminal 7 of current rectifying and wave filtering circuit 4, and the other end is electrically connected to the output negative terminal 8 of current rectifying and wave filtering circuit 4, one end of the series connection bleeder circuit of resistance R 16 and resistance R 17 is electrically connected to the primary coil output of transformer 38, the other end is electrically connected to ground GND, the input 19 of output voltage error signal feedback circuit 20 is electrically connected to the tie point 17 between resistance R 14 and resistance R 15, obtains the voltage VA value after the direct voltage dividing potential drop of output negative terminal 8 of 7 pairs of current rectifying and wave filtering circuits 4 of output plus terminal of current rectifying and wave filtering circuit 4 at input 19, another input 18 of output voltage error signal feedback circuit 20 is electrically connected to the tie point 16 between resistance R 16 and resistance R 17, the voltage VB value when input 18 obtains switch 34 and opens and close after the voltage dividing potential drop of 36 couples of GND of armature winding tie point of switch 34 and transformer 38.
As shown in Figure 2, described output voltage error signal feedback circuit 20 is by buffering input circuit 45, sampling hold circuit 52, Buffer output circuit 56, inverter 66, sampling time circuit 69 and subtracter 61 form, through input 18, send the voltage VB after the voltage dividing potential drop collecting to buffering input circuit 45, buffering input circuit 45 sends voltage signal to sampling hold circuit 52, after the time delay and Timing Processing of switch controlling signal that the input 23 of output voltage error signal feedback circuit 20 receives and sampling time circuit 69 anti-phase through inverter 66, send sampling hold circuit 52 to, sampling hold circuit 52 is input to the magnitude of voltage of collection the input 60 of subtracter 61 after maintenance a period of time, voltage VB deducts the voltage VA value of the input 19 of subtracter 61, in output 24 output of subtracter 61 are the magnitudes of voltage with the proportional relation of output voltage, the feedback end that this magnitude of voltage is input to PWM controller 27 goes by-pass cock duty ratio.
Described switch 34 is transistors, also can be field effect transistor, the collector electrode of triode or the drain electrode of field effect transistor are connected with 36, and the emitter of triode or the source electrode of field effect transistor are connected with 33, and the base stage of triode or the grid of field effect transistor are connected with 35.
The turn ratio n that the output voltage VO that is approximately equal to voltage VB is multiplied by the primary and secondary of transformer adds VA, therefore, value by the value after the voltage VB dividing potential drop collecting after sampling hold circuit 52 keeps deducts the magnitude of voltage after the voltage VA dividing potential drop collecting in subtraction circuit 61, gained difference and output voltage are proportional, the output voltage error feedback signal that this difference regulates gain to can be used as PWM controller to set point through subtraction circuit 61 again regulates duty ratio, reaches the object of regulated output voltage.
As shown in Figure 3, power circuit 11 comprises ac buck electric capacity 86, filter capacitor 96, rectification circuit 87, voltage stabilizing circuit 92, ac buck electric capacity 86 is serially connected in the input of rectification circuit 87, after rectification circuit 87 is in parallel with filter capacitor 96, be electrically connected to voltage stabilizing circuit 92, the both end voltage of filter capacitor 96 maintains lower voltage and is input to voltage stabilizing circuit 92, and starting current and the operating current of output voltage error signal feedback circuit 20 and PWM controller 27 is provided.
It should be noted that; above-mentioned execution mode is only preferably embodiment of the present invention; can not be understood as limiting the scope of the invention, conceive under prerequisite not departing from the present invention, any minor variations that the present invention is done all belongs to protection scope of the present invention with modifying.
Claims (4)
1. a supply convertor, it is characterized in that: comprise current rectifying and wave filtering circuit, power circuit, output voltage error signal feedback circuit, PWM controller, resistance R 14, resistance R 15, resistance R 16, resistance R 17, transformer, switch and resistance R 32, wherein, the output of current rectifying and wave filtering circuit is electrically connected to the input of the primary coil of transformer, after being connected in series with switch and resistance R 32 successively, the output of the primary coil of transformer is electrically connected to ground GND, the output of output voltage error signal feedback circuit is connected with the feedback end of PWM controller, error feedback signal is fed back to PWM controller, the switch controlling signal output of the input of output voltage error signal feedback circuit and PWM controller is connected, the switching signal of the drive output of the output switching signal of switch controlling signal output and PWM controller is synchronous, PWM controller sends driving signal to switch from drive output, one end of series connection bleeder circuit and the output plus terminal of current rectifying and wave filtering circuit of resistance R 14 and resistance R 15 are electrically connected to, and the other end is electrically connected to the output negative terminal of current rectifying and wave filtering circuit, one end of the series connection bleeder circuit of resistance R 16 and resistance R 17 is electrically connected to the primary coil output of transformer, the other end is electrically connected to ground GND, the input of output voltage error signal feedback circuit is electrically connected to the tie point between resistance R 14 and resistance R 15, the voltage VA value of the output plus terminal that obtains current rectifying and wave filtering circuit at input after to the direct voltage dividing potential drop of the output negative terminal of current rectifying and wave filtering circuit, another input of output voltage error signal feedback circuit is electrically connected to the tie point between resistance R 16 and resistance R 17, the voltage VB value of the armature winding tie point of switch and transformer after to the voltage dividing potential drop of GND when input obtains switch and opens and close.
2. supply convertor according to claim 1, it is characterized in that: described output voltage error signal feedback circuit is by buffering input circuit, sampling hold circuit, Buffer output circuit, inverter, sampling time circuit and subtracter form, when the switch collecting opens and cuts out, the voltage VB value of the armature winding tie point of switch and transformer after to the voltage dividing potential drop of GND sends buffering input circuit to through input, buffering input circuit sends voltage signal to sampling hold circuit, after the time delay and Timing Processing of switch controlling signal that the input of output voltage error signal feedback circuit receives and sampling time circuit anti-phase through inverter, send sampling hold circuit to, sampling hold circuit is input to the magnitude of voltage of collection an input of subtracter after maintenance a period of time, the voltage VA value of the output plus terminal that voltage VB value deducts the current rectifying and wave filtering circuit that another input of subtracter collects after to the direct voltage dividing potential drop of the output negative terminal of current rectifying and wave filtering circuit, the output output of subtracter be the magnitude of voltage with the proportional relation of output voltage, this magnitude of voltage is input to the feedback end of PWM controller.
3. supply convertor according to claim 1, is characterized in that: described switch is transistor or field effect transistor.
4. supply convertor according to claim 1, it is characterized in that: described power circuit comprises ac buck electric capacity, filter capacitor, rectification circuit, voltage stabilizing circuit, ac buck capacitance series is at the input of rectification circuit, and rectification circuit is electrically connected to voltage stabilizing circuit with after filter capacitor parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009003.1A CN103683942B (en) | 2014-01-09 | 2014-01-09 | A kind of supply convertor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009003.1A CN103683942B (en) | 2014-01-09 | 2014-01-09 | A kind of supply convertor |
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| CN103683942A true CN103683942A (en) | 2014-03-26 |
| CN103683942B CN103683942B (en) | 2017-06-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6721192B1 (en) * | 2003-03-24 | 2004-04-13 | System General Corp. | PWM controller regulating output voltage and output current in primary side |
| CN201699597U (en) * | 2010-06-12 | 2011-01-05 | 福建农林大学 | Multi-valued direct-current power circuit adopting capacitive voltage reduction |
| CN202488831U (en) * | 2012-02-28 | 2012-10-10 | 福建农林大学 | Novel capacitor step-down high-power LED (Light-Emitting Diode) driving circuit |
| CN203167339U (en) * | 2013-01-08 | 2013-08-28 | 苏州聚元微电子有限公司 | LED drive circuit without auxiliary winding |
| CN203691236U (en) * | 2014-01-09 | 2014-07-02 | 惠州天能源科技有限公司 | Power supply converter |
-
2014
- 2014-01-09 CN CN201410009003.1A patent/CN103683942B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6721192B1 (en) * | 2003-03-24 | 2004-04-13 | System General Corp. | PWM controller regulating output voltage and output current in primary side |
| CN201699597U (en) * | 2010-06-12 | 2011-01-05 | 福建农林大学 | Multi-valued direct-current power circuit adopting capacitive voltage reduction |
| CN202488831U (en) * | 2012-02-28 | 2012-10-10 | 福建农林大学 | Novel capacitor step-down high-power LED (Light-Emitting Diode) driving circuit |
| CN203167339U (en) * | 2013-01-08 | 2013-08-28 | 苏州聚元微电子有限公司 | LED drive circuit without auxiliary winding |
| CN203691236U (en) * | 2014-01-09 | 2014-07-02 | 惠州天能源科技有限公司 | Power supply converter |
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| CN103683942B (en) | 2017-06-13 |
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Owner name: TIANBAO ELECTRONIC (HUIZHOU) CO., LTD. Free format text: FORMER OWNER: HUIZHOU TEN SOURCES SOLAR ELECTRICITY LTD. Effective date: 20150518 Free format text: FORMER OWNER: TIANBAO ELECTRONIC (HUIZHOU) CO., LTD. Effective date: 20150518 |
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Effective date of registration: 20150518 Address after: 516005 Dongjiang Industrial Zone, Shuikou subdistrict, Huicheng District, Guangdong, Huizhou Applicant after: Ten Pao Electronics (Huizhou) Co., Ltd. Address before: 516005 Dongjiang Industrial Zone, Shuikou subdistrict, Huicheng District, Guangdong, Huizhou Applicant before: HUIZHOU TEN SOURCES SOLAR ELECTRICITY LIMITED Applicant before: Ten Pao Electronics (Huizhou) Co., Ltd. |
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