CN104135043A - Two-stage safety protection feedback control charger - Google Patents
Two-stage safety protection feedback control charger Download PDFInfo
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- CN104135043A CN104135043A CN201410271796.4A CN201410271796A CN104135043A CN 104135043 A CN104135043 A CN 104135043A CN 201410271796 A CN201410271796 A CN 201410271796A CN 104135043 A CN104135043 A CN 104135043A
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- 239000003990 capacitor Substances 0.000 claims description 66
- 230000005669 field effect Effects 0.000 claims description 9
- -1 resistance R 5 Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention discloses a two-stage safety protection feedback control charger which comprises an AC input circuit, a transfer, a DC output circuit, a PWM (Pulse Width Modulation) driving chip and a first voltage feedback circuit, wherein the AC input circuit is electrically connected with the transformer, the transformer is electrically connected with the DC output circuit, the DC output circuit is electrically connected with a first voltage feedback circuit, the first voltage feedback circuit is electrically connected with the PWM driving chip, the two-stage safety protection feedback control charger is characterized by also comprising a second voltage feedback circuit and an auxiliary power supply, the DC output circuit is electrically connected with the second voltage feedback circuit, the second voltage feedback circuit is electrically connected with the PWM driving chip, and the auxiliary power supply is electrically connected with the first voltage feedback circuit, the second voltage feedback circuit and the PWM driving chip. With the addition of the second voltage feedback circuit and the auxiliary power supply, a power supply mode is changed, the charger is safe and reliable in charging, the charging performance is improved, and the purpose of energy saving can be achieved due to the characteristic of low-power consumption standby of the auxiliary power supply.
Description
Technical field
The present invention relates to a kind of two-stage safeguard protection FEEDBACK CONTROL charger, belong to charger device technical field.
Background technology
Along with socioeconomic development, the kind of electronic product is more and more, as the supporting requirement of electronic product, the demand of charger is also more and more, the original object of charger is exactly in order to charge to electronic product, at present, the circuit structure of charger as shown in Figure 1, the charger of this structure is only focused on the charge function of charger, can be full of electricity to electronic product, and not high to the charging reliability and stability concern of transformer, some charger also exists charge efficiency low, the problem wasting energy.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides a kind of two-stage safeguard protection FEEDBACK CONTROL charger, and charging performance is good, safe and reliable, energy savings, and charge efficiency is high.
To achieve these goals, the technical solution used in the present invention is: a kind of two-stage safeguard protection FEEDBACK CONTROL charger, comprise ac input circuit, transformer, DC output circuit, PWM drives chip and the first voltage feedback circuit, ac input circuit is electrically connected to transformer, transformer is electrically connected to DC output circuit, DC output circuit is electrically connected to the first voltage feedback circuit, the first voltage feedback circuit drives chip to be electrically connected to PWM, also comprise second voltage feedback circuit and accessory power supply, DC output circuit is electrically connected to second voltage feedback circuit, second voltage feedback circuit drives chip to be electrically connected to PWM, accessory power supply and the first voltage feedback circuit, second voltage feedback circuit and PWM drive chip to be electrically connected to.
Further, ac input circuit comprises live wire access pin L, zero line access pin N, fuse FS1, rectifier diode D1, rectifier diode D2, rectifier diode D3, rectifier diode D4 and electrochemical capacitor C1, live wire access pin L is connected to the anode of rectifier diode D1 and the negative electrode of rectifier diode D3 by fuse FS1, zero line access pin N is connected to the anode of rectifier diode D2 and the negative electrode of rectifier diode D4, the negative electrode of the negative electrode of rectifier diode D1 and rectifier diode D2 is connected to the positive pole of electrochemical capacitor C1, the anodic bonding of the anode of rectifier diode D3 and rectifier diode D4 is to the negative pole of electrochemical capacitor C1.
Further, transformer comprises resistance R 1, capacitor C 2, rectifier diode D5, transformer T1 and rectifier diode D6, one end of resistance R 1 is connected to one end of capacitor C 2 and the first pin of T1, the other end of resistance R 1 is connected to the other end of capacitor C 2 and the negative electrode of rectifier diode D5, the anodic bonding of rectifier diode D5 is to the three-prong of transformer T1, the plus earth of rectifier diode D6, the negative electrode of rectifier diode D6 is connected to the second pin of transformer T1, the 11st pin of transformer is connected to the ground of direct current output, the 12nd pin of transformer is connected to the anode of the Schottky diode D7 of direct current output.
Further, DC output circuit comprises Schottky diode D7, Schottky diode D8, inductance L 1 and electrochemical capacitor C10, the negative electrode of the negative electrode of Schottky diode D7 and Schottky diode D8 is connected to the positive pole of electrochemical capacitor C10 and the anodal output pin of direct current output by inductance L 1, and the negative pole of the anode of Schottky diode D8 and electrochemical capacitor C1O is connected to output ground.
Further, PWM drives chip, comprises electrochemical capacitor C3, PWM drives chip U1, resistance R 3, capacitor C 4, capacitor C 7, resistance R 4, capacitor C 6, resistance R 5, capacitor C 5, resistance R 6, N channel depletion type field effect transistor Q1 and resistance R 2, PWM drives the first pin of chip U1 to be connected to the 4th pin of U2 and U3, one end of resistance R 3 and capacitor C 4, the 4th pin of U2 and U3, the other end of resistance R 3 and capacitor C 4, PWM drives the 2nd pin of chip U1, the 5th pin ground connection, PWM drives the 3rd pin of chip U1 by capacitor C 6 ground connection, by resistance R 4, be connected to PWM and drive chip U1 the 8th pin, PWM drives the 4th pin of chip U1 by capacitor C 5 ground connection, by resistance R 5, be connected to one end of resistance R 2 and the source electrode of N channel depletion type field effect transistor Q1, the other end ground connection of resistance R 2, PWM drives the 6th pin of chip U1 by resistance R 6, to be connected to the gate pole of Q1, the drain electrode of N channel depletion type field effect transistor Q1 is connected to the 3rd pin of transformer, PWM drives the 7th pin of chip U1 to be connected with accessory power supply and passes through electrochemical capacitor C3 ground connection, and PWM drives the 8th pin of chip U1 by capacitor C 7 ground connection.
Further, the first voltage feedback circuit comprises resistance R 7, photoelectrical coupler U28, resistance R 8, diode D12, comparison amplifier U58, capacitor C 8, resistance R 9, resistance R 10, resistance R 11 and resistance R 12, accessory power supply is connected to the first pin of photoelectrical coupler U28 by resistance R 7, the second pin of photoelectrical coupler U2 is connected to the anode of diode D12 by resistance R 8, the negative electrode of diode D12 is connected to the 7th pin of comparison amplifier U58, and successively by capacitor C 8, resistance R 9 is connected to the 6th pin and the resistance R 11 of comparison amplifier U58, one end of resistance R 12, the other end of resistance R 11 is connected to the positive pole of DC output circuit, the other end of resistance R 12 is connected to the ground of DC output circuit, the 5th pin of comparison amplifier U58 is connected to reference voltage input terminal by resistance R 10, the 8th pin of comparison amplifier U58 is connected to the secondary output voltage of accessory power supply, the 4th pin of comparison amplifier U58 is connected to ground.
Further, second voltage feedback circuit comprises resistance R 13, photoelectrical coupler U38, one end of resistance R 13 is connected to the positive pole of DC output circuit, the other end of resistance R 13 is connected to the first pin of photoelectrical coupler U38, the second pin ground connection of photoelectrical coupler U38, the three-prong of photoelectrical coupler U38 connects ground, former limit, and the 4th pin of photoelectrical coupler U38 connects the first pin that PWM drives chip.
The invention has the beneficial effects as follows: by former charging device, increase second voltage feedback circuit and accessory power supply and change supply power mode and realize start, zero volt safely and fast and work the object of filling with the controlled output of multivoltage, not only realized charger charging safe and reliable, improve the performance of charging, and because the feature of accessory power supply low-power consumption standby can also reach the object of energy savings.
Accompanying drawing explanation
Fig. 1 is existing charger circuit structured flowchart;
Fig. 2 is circuit structure block diagram of the present invention;
Fig. 3 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figures 2 and 3, this two-stage safeguard protection FEEDBACK CONTROL charger, comprise ac input circuit, transformer, DC output circuit, PWM drives chip and the first voltage feedback circuit, ac input circuit is electrically connected to transformer, transformer is electrically connected to DC output circuit, DC output circuit is electrically connected to the first voltage feedback circuit, the first voltage feedback circuit drives chip to be electrically connected to PWM, also comprise second voltage feedback circuit and accessory power supply, DC output circuit is electrically connected to second voltage feedback circuit, second voltage feedback circuit drives chip to be electrically connected to PWM, accessory power supply and the first voltage feedback circuit, second voltage feedback circuit and PWM drive chip to be electrically connected to.Ac input circuit comprises live wire access pin L, zero line access pin N, fuse FS1, rectifier diode D1, rectifier diode D2, rectifier diode D3, rectifier diode D4 and electrochemical capacitor C1, live wire access pin L is connected to the anode of rectifier diode D1 and the negative electrode of rectifier diode D3 by fuse FS1, zero line access pin N is connected to the anode of rectifier diode D2 and the negative electrode of rectifier diode D4, the negative electrode of the negative electrode of rectifier diode D1 and rectifier diode D2 is connected to the positive pole of electrochemical capacitor C1, the anodic bonding of the anode of rectifier diode D3 and rectifier diode D4 is to the negative pole of electrochemical capacitor C1.Transformer comprises resistance R 1, capacitor C 2, rectifier diode D5, transformer T1 and rectifier diode D6, one end of resistance R 1 is connected to one end of capacitor C 2 and the first pin of T1, the other end of resistance R 1 is connected to the other end of capacitor C 2 and the negative electrode of rectifier diode D5, the anodic bonding of rectifier diode D5 is to the three-prong of transformer T1, the plus earth of rectifier diode D6, the negative electrode of rectifier diode D6 is connected to the second pin of transformer T1, the 11st pin of transformer is connected to the ground of direct current output, the 12nd pin of transformer is connected to the anode of the Schottky diode D7 of direct current output.DC output circuit comprises Schottky diode D7, Schottky diode D8, inductance L 1 and electrochemical capacitor C10, the negative electrode of the negative electrode of Schottky diode D7 and Schottky diode D8 is connected to the positive pole of electrochemical capacitor C10 and the anodal output pin of direct current output by inductance L 1, and the negative pole of the anode of Schottky diode D8 and electrochemical capacitor C1O is connected to output ground.PWM drives chip, comprises electrochemical capacitor C3, PWM drives chip U1, resistance R 3, capacitor C 4, capacitor C 7, resistance R 4, capacitor C 6, resistance R 5, capacitor C 5, resistance R 6, N channel depletion type field effect transistor Q1 and resistance R 2, PWM drives the first pin of chip U1 to be connected to the 4th pin of U2 and U3, one end of resistance R 3 and capacitor C 4, the 4th pin of U2 and U3, the other end of resistance R 3 and capacitor C 4, PWM drives the 2nd pin of chip U1, the 5th pin ground connection, PWM drives the 3rd pin of chip U1 by capacitor C 6 ground connection, by resistance R 4, be connected to PWM and drive chip U1 the 8th pin, PWM drives the 4th pin of chip U1 by capacitor C 5 ground connection, by resistance R 5, be connected to one end of resistance R 2 and the source electrode of N channel depletion type field effect transistor Q1, the other end ground connection of resistance R 2, PWM drives the 6th pin of chip U1 by resistance R 6, to be connected to the gate pole of Q1, the drain electrode of N channel depletion type field effect transistor Q1 is connected to the 3rd pin of transformer, PWM drives the 7th pin of chip U1 to be connected with accessory power supply and passes through electrochemical capacitor C3 ground connection, and PWM drives the 8th pin of chip U1 by capacitor C 7 ground connection.The first voltage feedback circuit comprises resistance R 7, photoelectrical coupler U28, resistance R 8, diode D12, comparison amplifier U58, capacitor C 8, resistance R 9, resistance R 10, resistance R 11 and resistance R 12, accessory power supply is connected to the first pin of photoelectrical coupler U28 by resistance R 7, the second pin of photoelectrical coupler U2 is connected to the anode of diode D12 by resistance R 8, the negative electrode of diode D12 is connected to the 7th pin of comparison amplifier U58, and successively by capacitor C 8, resistance R 9 is connected to the 6th pin and the resistance R 11 of comparison amplifier U58, one end of resistance R 12, the other end of resistance R 11 is connected to the positive pole of DC output circuit, the other end of resistance R 12 is connected to the ground of DC output circuit, the 5th pin of comparison amplifier U58 is connected to reference voltage input terminal by resistance R 10, the 8th pin of comparison amplifier U58 is connected to the secondary output voltage of accessory power supply, the 4th pin of comparison amplifier U58 is connected to ground.Second voltage feedback circuit comprises resistance R 13, photoelectrical coupler U38, one end of resistance R 13 is connected to the positive pole of DC output circuit, the other end of resistance R 13 is connected to the first pin of photoelectrical coupler U38, the second pin ground connection of photoelectrical coupler U38, the three-prong of photoelectrical coupler U38 connects ground, former limit, and the 4th pin of photoelectrical coupler U38 connects the first pin that PWM drives chip.
Switching Power Supply charger for existing univoltage output, former secondary can with exchanging, input or direct current be exported or the power voltage supply work of the auxiliary winding rectification output of transformer, but work for ask for something single channel output multiple voltage, zero volt the charger that fills contour performance, because supply power voltage and output voltage have direct relation, this supply power mode can not meet demand, the problem that there will be high low-voltage to process, cause circuit uncontrollable, there is the phenomenons such as overcurrent-overvoltage, will burn out charger or battery.
For the charger of existing univoltage list electric current output, only with chips such as comparison amplifier, voltage-stabiliser tube or reference voltage voltage stabilizing chips, can well realize object.But for ask for something single channel output multiple voltage, zero volt, work the charger that fills contour performance, just must add microcontroller chip, desired various reference voltage is provided.
For charger of the present invention, increase a road small-power, low cost, low-power consumption accessory power supply, not only can export multiple voltage, zero volt for single channel and rise and the characteristic such as fill and realize basic function of supplying power, make the normal trouble free service of circuit, and the characteristic of its low-power consumption standby have advantages of energy savings.
For charger of the present invention, use PWM to drive chip that various feedback reference voltage source is provided, realize the object of multivoltage output.
For charger of the present invention, when starting the machine, when PWM drives chip reset initialization, each pin voltage state is uncontrolled, feedback voltage source is also just uncertain, in the time of may having startup, overvoltage burns out the dangerous phenomenon of charger, for preventing that this phenomenon from occurring, then increase the rapid-action second voltage feedback circuit that a road voltage-stabiliser tube forms, restriction maximum output voltage.And can, when charger is worked, as dual fail-safe, protect the generation of overvoltage phenomenon.
Claims (7)
1. a two-stage safeguard protection FEEDBACK CONTROL charger, comprise ac input circuit, transformer, DC output circuit, PWM drives chip and the first voltage feedback circuit, ac input circuit is electrically connected to transformer, transformer is electrically connected to DC output circuit, DC output circuit is electrically connected to the first voltage feedback circuit, the first voltage feedback circuit drives chip to be electrically connected to PWM, it is characterized in that, also comprise second voltage feedback circuit and accessory power supply, DC output circuit is electrically connected to second voltage feedback circuit, second voltage feedback circuit drives chip to be electrically connected to PWM, accessory power supply and the first voltage feedback circuit, second voltage feedback circuit and PWM drive chip to be electrically connected to.
2. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1, it is characterized in that, described ac input circuit comprises live wire access pin L, zero line access pin N, fuse FS1, rectifier diode D1, rectifier diode D2, rectifier diode D3, rectifier diode D4 and electrochemical capacitor C1, live wire access pin L is connected to the anode of rectifier diode D1 and the negative electrode of rectifier diode D3 by fuse FS1, zero line access pin N is connected to the anode of rectifier diode D2 and the negative electrode of rectifier diode D4, the negative electrode of the negative electrode of rectifier diode D1 and rectifier diode D2 is connected to the positive pole of electrochemical capacitor C1, the anodic bonding of the anode of rectifier diode D3 and rectifier diode D4 is to the negative pole of electrochemical capacitor C1.
3. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1, it is characterized in that, described transformer comprises resistance R 1, capacitor C 2, rectifier diode D5, transformer T1 and rectifier diode D6, one end of resistance R 1 is connected to one end of capacitor C 2 and the first pin of T1, the other end of resistance R 1 is connected to the other end of capacitor C 2 and the negative electrode of rectifier diode D5, the anodic bonding of rectifier diode D5 is to the three-prong of transformer T1, the plus earth of rectifier diode D6, the negative electrode of rectifier diode D6 is connected to the second pin of transformer T1, the 11st pin of transformer is connected to the ground of direct current output, the 12nd pin of transformer is connected to the anode of the Schottky diode D7 of direct current output.
4. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1; it is characterized in that; described DC output circuit comprises Schottky diode D7, Schottky diode D8, inductance L 1 and electrochemical capacitor C10; the negative electrode of the negative electrode of Schottky diode D7 and Schottky diode D8 is connected to the positive pole of electrochemical capacitor C10 and the anodal output pin of direct current output by inductance L 1, and the negative pole of the anode of Schottky diode D8 and electrochemical capacitor C1O is connected to output ground.
5. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1, is characterized in that, described PWM drives chip, comprises electrochemical capacitor C3, PWM drives chip U1, resistance R 3, capacitor C 4, capacitor C 7, resistance R 4, capacitor C 6, resistance R 5, capacitor C 5, resistance R 6, N channel depletion type field effect transistor Q1 and resistance R 2, PWM drives the first pin of chip U1 to be connected to the 4th pin of U2 and U3, one end of resistance R 3 and capacitor C 4, the 4th pin of U2 and U3, the other end of resistance R 3 and capacitor C 4, PWM drives the 2nd pin of chip U1, the 5th pin ground connection, PWM drives the 3rd pin of chip U1 by capacitor C 6 ground connection, by resistance R 4, be connected to PWM and drive chip U1 the 8th pin, PWM drives the 4th pin of chip U1 by capacitor C 5 ground connection, by resistance R 5, be connected to one end of resistance R 2 and the source electrode of N channel depletion type field effect transistor Q1, the other end ground connection of resistance R 2, PWM drives the 6th pin of chip U1 by resistance R 6, to be connected to the gate pole of Q1, the drain electrode of N channel depletion type field effect transistor Q1 is connected to the 3rd pin of transformer, PWM drives the 7th pin of chip U1 to be connected with accessory power supply and passes through electrochemical capacitor C3 ground connection, and PWM drives the 8th pin of chip U1 by capacitor C 7 ground connection.
6. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1, it is characterized in that, the first described voltage feedback circuit comprises resistance R 7, photoelectrical coupler U28, resistance R 8, diode D12, comparison amplifier U58, capacitor C 8, resistance R 9, resistance R 10, resistance R 11 and resistance R 12, accessory power supply is connected to the first pin of photoelectrical coupler U28 by resistance R 7, the second pin of photoelectrical coupler U2 is connected to the anode of diode D12 by resistance R 8, the negative electrode of diode D12 is connected to the 7th pin of comparison amplifier U58, and successively by capacitor C 8, resistance R 9 is connected to the 6th pin and the resistance R 11 of comparison amplifier U58, one end of resistance R 12, the other end of resistance R 11 is connected to the positive pole of DC output circuit, the other end of resistance R 12 is connected to the ground of DC output circuit, the 5th pin of comparison amplifier U58 is connected to reference voltage input terminal by resistance R 10, the 8th pin of comparison amplifier U58 is connected to the secondary output voltage of accessory power supply, the 4th pin of comparison amplifier U58 is connected to ground.
7. a kind of two-stage safeguard protection FEEDBACK CONTROL charger according to claim 1; it is characterized in that; described second voltage feedback circuit comprises resistance R 13, photoelectrical coupler U38; one end of resistance R 13 is connected to the positive pole of DC output circuit; the other end of resistance R 13 is connected to the first pin of photoelectrical coupler U38; the second pin ground connection of photoelectrical coupler U38; the three-prong of photoelectrical coupler U38 connects ground, former limit, and the 4th pin of photoelectrical coupler U38 connects the first pin that PWM drives chip.
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| CN201410271796.4A CN104135043B (en) | 2014-06-18 | 2014-06-18 | A kind of two-stage safeguard protection feedback control charger |
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| CN201410271796.4A CN104135043B (en) | 2014-06-18 | 2014-06-18 | A kind of two-stage safeguard protection feedback control charger |
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| CN104135043B CN104135043B (en) | 2016-08-24 |
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| WO2019056319A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| CN112564490A (en) * | 2020-11-11 | 2021-03-26 | 广州金升阳科技有限公司 | Output voltage switching circuit of switching power supply and switching method thereof |
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| CN104135043B (en) | 2016-08-24 |
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