CN201550033U - Switch power supply based on PWM control and charger provided with same - Google Patents
Switch power supply based on PWM control and charger provided with same Download PDFInfo
- Publication number
- CN201550033U CN201550033U CN2009202061305U CN200920206130U CN201550033U CN 201550033 U CN201550033 U CN 201550033U CN 2009202061305 U CN2009202061305 U CN 2009202061305U CN 200920206130 U CN200920206130 U CN 200920206130U CN 201550033 U CN201550033 U CN 201550033U
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- control chip
- power supply
- output end
- voltage
- pin
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Abstract
The utility model discloses a switch power supply based on PWM (pulse-width modulation) control and a charger provided with same. The charger controls the operation of a switch transformer through a PWM control chip, and converts DC current with high voltage into DC current with low voltage; all circuits are integrated in a casing with one end connected with a commercial power and the other end connected with an USB socket. Compared with the prior art, the utility model has the advantages the debugging is simple, the stability is good, the anti-interference performance is high, the precision is kept within the range of 5 percent, the efficiency meets the CEC and COC standards. The charger disclosed by the utility model has the advantages of compact structure, and beautiful and exquisite appearance.
Description
Technical field
The utility model relates to Switching Power Supply, relate in particular to a kind of based on PWM control Switching Power Supply and with the charger of this Switching Power Supply.
Background technology
Along with the continuous development of electronic technology, the kind of digital product emerges in an endless stream, and various batteries have also obtained great development, and provides the portable small-power power of electric energy also more and more for it.Battery charger in the market all is to save cost to adopt the non-frequency power RCC pattern of deciding mostly, and this class power supply has following defective: 1, the RCC circuit is very high to original paper, wiring, manufacturing technique requirent; 2, low, the debugging trouble of efficient; Stability and anti-interference characteristic when poor, unloaded are also good inadequately sometimes.
The utility model content
The utility model is the above-mentioned deficiency that will solve prior art, propose a kind of debug easy, efficient is high, stability good, anti-interference is high based on the Switching Power Supply of PWM control and with the charger of this Switching Power Supply.
For solving the problems of the technologies described above, the technical scheme that the utility model proposes is: a kind of Switching Power Supply based on PWM control comprises the power conversion filter circuit that civil power is transformed to direct current and filtering; This circuit provides electrode input end and negative input; The dc output end of output low-voltage DC; Direct current is transformed to the switch transformer of low-voltage DC, and this switch transformer has an elementary winding that connects electrode input end, one and connects the negative input other end and connect the feedback winding of feedback output end, the secondary winding that is connected with dc output end; The control chip of control switch transformer voltage of transformation, this control chip control pin connects the other end of described elementary winding; Being used for when starting to the starting resistance of control chip power supply of the described control chip of another termination of the described electrode input end of one termination power supply pin, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal; Connect the electric resistance partial pressure sample circuit of described feedback output end to control chip sampling input pin input sampling voltage signal; Be attempted by described elementary winding two and be used to absorb the absorption circuit of due to voltage spikes; Be connected on the output loop that is used for filtering and burning voltage between described secondary winding and the dc output end.Above-mentioned control chip can adopt pwm chip OB2535.
A kind of tape base comprises housing in the charger of the Switching Power Supply of PWM control; It is outer to connect the pin of civil power that part is stretched out housing; Place the power conversion filter circuit that in the housing civil power of pin place input is transformed to direct current and filtering, this circuit provides electrode input end and negative input; The dc output end of output low-voltage DC; Direct current is transformed to the switch transformer of low-voltage DC, and this switch transformer has an elementary winding that connects electrode input end, one and connects the negative input other end and connect the feedback winding of feedback output end, the secondary winding that is connected with dc output end; The control chip of control switch transformer voltage of transformation, this control chip control pin connects the other end of described elementary winding; Being used for when starting to the starting resistance of control chip power supply of the described control chip of another termination of the described electrode input end of one termination power supply pin, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal; Connect the electric resistance partial pressure sample circuit of described feedback output end to control chip sampling input pin INV input sampling voltage signal; Be attempted by described elementary winding two and be used to absorb the absorption circuit of due to voltage spikes; Be connected on the output loop that is used for filtering and burning voltage between described secondary winding and the dc output end; One end stretches out the accessory power outlet that the housing other end is connected with described dc output end.Above-mentioned control chip can adopt pwm chip OB2535.Above-mentioned accessory power outlet can adopt USB socket.
Compared with prior art, easy, the good anti-interference height of stability of the utility model debugging, precision remains in 5%, and efficient reaches standards such as CEC, COC.The disclosed charger of the utility model also has compact conformation, the advantage that good looking appearance is small and exquisite.
Description of drawings
Below in conjunction with drawings and Examples the utility model is made detailed explanation, wherein:
Fig. 1 is the utility model charger circuit schematic diagram;
Fig. 2 is the utility model charger schematic appearance.
Embodiment
The Switching Power Supply based on PWM control that the utility model proposes comprises the power conversion filter circuit 1 that civil power is transformed to direct current and filtering; This circuit provides electrode input end V+ and negative input V-; The dc output end Vout of output low-voltage DC; Direct current is transformed to the switch transformer 2 of low-voltage DC, and this switch transformer has an elementary winding 2a who connects electrode input end, one and meets feedback winding 2c, the secondary winding 2b that is connected with dc output end that the negative input other end meets feedback output end 2ca; The control chip 3 of control switch transformer voltage of transformation, this control chip control pin Drain connects the other end of described elementary winding; Being used for when starting to the starting resistance 4 of control chip power supply of the described control chip of another termination of the described electrode input end of one termination power supply pin, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal; Connect the electric resistance partial pressure sample circuit 5 of described feedback output end to control chip sampling input pin INV input sampling voltage signal; Be attempted by described elementary winding two and be used to absorb the absorption circuit 6 of due to voltage spikes; Be connected on the output loop 7 that is used for filtering and burning voltage between described secondary winding and the dc output end.Above-mentioned control chip adopts pwm chip OB2535.
The tape base that the utility model proposes comprises housing 21 in the charger of the Switching Power Supply of PWM control; It is outer to connect the pin 22 of civil power that part is stretched out housing; Place the power conversion filter circuit 1 that in the housing civil power of pin place input is transformed to direct current and filtering, this circuit provides electrode input end V+ and negative input V-; The dc output end Vout of output low-voltage DC; Direct current is transformed to the switch transformer 2 of low-voltage DC, and this switch transformer has an elementary winding 2a who connects electrode input end, one and meets feedback winding 2c, the secondary winding 2b that is connected with dc output end that the negative input other end meets feedback output end 2ca; The control chip 3 of control switch transformer voltage of transformation, this control chip control pin Drain connects the other end of described elementary winding; Being used for when starting to the starting resistance 4 of control chip power supply of the described control chip of another termination of the described electrode input end of one termination power supply pin, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal; Connect the electric resistance partial pressure sample circuit 5 of described feedback output end to control chip sampling input pin INV input sampling voltage signal; Be attempted by described elementary winding two and be used to absorb the absorption circuit 6 of due to voltage spikes; Be connected on the output loop 7 that is used for filtering and burning voltage between described secondary winding and the dc output end; One end stretches out the accessory power outlet that the housing other end is connected with described dc output end.
Fig. 1 shows the utility model charger circuit schematic diagram, as can be seen from the figure the input AC electricity through fuse F1, after rectifier bridge heap BD1 rectification, be transformed to direct current again, as switch transformer 2 (T1); Capacitor C 1, C2, L1 constitute the ripple part of II type filtering in order to filtering direct current input current, reduce input current harmonics content; F1, BD1, C1, C2, L1 constitute power conversion filter circuit 1.Resistance R 4, R5 are starting resistance 4, and (IC) provides starting resistor for control chip 3, and R2, C3, D1 constitute the absorption circuit 6 of elementary winding 2a, in order to absorb the due to voltage spikes that is caused by leakage inductance, the built-in MOS of protection IC; T1 has a feedback winding 2c, the electric resistance partial pressure sample circuit 5 that this winding constitutes by R6, R7 and R8, R9 on the one hand, and the dividing potential drop sampling is connected in the INV end of IC, in order to regulate and control output voltage, provides power supply by R3, D2 for the operate as normal of IC on the other hand; The built-in MOS switching tube of IC directly links to each other with T1 is elementary by the Drain pin, and C6 is the building-out capacitor of IC internal loop, in order to improve the stability of loop; R10, R11 in order to the rising edge (metal-oxide-semiconductor electric current) of sample rate current, thereby control the maximum power that secondary winding is exported as the detection resistance of built-in MOS electric current.Output loop 7 is made up of D3, L2, C7, C8, R12 etc.: wherein, D3 is the Schottky rectifier diode, and anode directly links to each other with the USB interface shell, and the heat radiation of D3 is had great help, R13, C9 be in order to absorb the pulse voltage spike on the D3, prevents that crest voltage is too high and damage; C7, C8, the filter circuit of L2 for exporting, R12 is the output dummy load, improves the stability of output voltage.
Fig. 2 shows the utility model charger schematic appearance, and figure middle shell 21 protects the circuit parcel, and the pin 22 that links to each other with power conversion filter circuit 1 extends outside the shell, and the USB accessory power outlet 23 that is connected with dc output end extends outside the shell.
Better embodiment of the present utility model has more than been described, but the those of skill in the art in the present technique field are to be understood that, these only illustrate, and can make numerous variations or modification to these execution modes, and not deviate from principle of the present utility model and essence.The scope that all belongs to the utility model protection.
Claims (5)
1. the Switching Power Supply based on PWM control comprises the power conversion filter circuit (1) that civil power is transformed to direct current and filtering, and this circuit provides electrode input end (V+) and negative input (V-); The dc output end (Vout) of output low-voltage DC; It is characterized in that also comprising:
Direct current is transformed to the switch transformer (2) of low-voltage DC, and this switch transformer has an elementary winding (2a) that connects electrode input end, one and connects the negative input other end and connect the feedback winding (2c) of feedback output end (2ca), the secondary winding (2b) that is connected with dc output end;
The control chip (3) of control switch transformer voltage of transformation, this control chip control pin (Drain) connects the other end of described elementary winding;
The described control chip of another termination of the described electrode input end of one termination power supply pin be used for when starting starting resistance (4) to the control chip power supply, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal;
Connect described feedback output end to the sample electric resistance partial pressure sample circuit (5) of input pin (INV) input sampling voltage signal of control chip;
Be attempted by described elementary winding two and be used to absorb the absorption circuit (6) of due to voltage spikes;
Be connected on the output loop that is used for filtering and burning voltage between described secondary winding and the dc output end.
2. the Switching Power Supply based on PWM control as claimed in claim 1 is characterized in that: described control chip adopts pwm chip OB2535.
3. a charger that uses the described Switching Power Supply based on PWM control of claim 1 comprises housing (21); It is outer to connect the pin (22) of civil power that part is stretched out housing; Place the power conversion filter circuit (1) that in the housing civil power of pin place input is transformed to direct current and filtering, this circuit provides electrode input end (V+) and negative input (V-); The dc output end (Vout) of output low-voltage DC; It is characterized in that comprising:
Direct current is transformed to the switch transformer (2) of low-voltage DC, and this switch transformer has an elementary winding (2a) that connects electrode input end, one and connects the negative input other end and connect the feedback winding (2c) of feedback output end (2ca), the secondary winding (2b) that is connected with dc output end;
The control chip (3) of control switch transformer voltage of transformation, this control chip control pin (Drain) connects the other end of described elementary winding;
The described control chip of another termination of the described electrode input end of one termination power supply pin be used for when starting starting resistance (4) to the control chip power supply, the feedback output end of described feedback winding connects control chip power supply pin, is used for powering to control chip when operate as normal;
Connect described feedback output end to the sample electric resistance partial pressure sample circuit (5) of input pin (INV) input sampling voltage signal of control chip;
Be attempted by described elementary winding two and be used to absorb the absorption circuit (6) of due to voltage spikes;
Be connected on the output loop that is used for filtering and burning voltage between described secondary winding and the dc output end;
One end stretches out the accessory power outlet that the housing other end is connected with described dc output end.
4. charger as claimed in claim 3 is characterized in that: described control chip adopts pwm chip OB2535.
5. charger as claimed in claim 4 is characterized in that: described accessory power outlet adopts USB socket (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202061305U CN201550033U (en) | 2009-10-30 | 2009-10-30 | Switch power supply based on PWM control and charger provided with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202061305U CN201550033U (en) | 2009-10-30 | 2009-10-30 | Switch power supply based on PWM control and charger provided with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201550033U true CN201550033U (en) | 2010-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202061305U Expired - Lifetime CN201550033U (en) | 2009-10-30 | 2009-10-30 | Switch power supply based on PWM control and charger provided with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201550033U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135043A (en) * | 2014-06-18 | 2014-11-05 | 徐州市恒源电器有限公司 | Two-stage safety protection feedback control charger |
| CN104426353A (en) * | 2013-08-27 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Switching power circuit, lighting device, and charger |
-
2009
- 2009-10-30 CN CN2009202061305U patent/CN201550033U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426353A (en) * | 2013-08-27 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Switching power circuit, lighting device, and charger |
| CN104135043A (en) * | 2014-06-18 | 2014-11-05 | 徐州市恒源电器有限公司 | Two-stage safety protection feedback control charger |
| CN104135043B (en) * | 2014-06-18 | 2016-08-24 | 徐州市恒源电器有限公司 | A kind of two-stage safeguard protection feedback control charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: GUANGDONG JIJIA PHOTOELECTRIC TECHNOLOGY CO., LTD. Assignor: SHENZHEN FRECOM ELECTRONICS CO., LTD. Contract record no.: 2014440020423 Denomination of utility model: Switch power supply based on PWM control and charger provided with same Granted publication date: 20100811 License type: Exclusive License Record date: 20141216 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| EM01 | Change of recordation of patent licensing contract |
Change date: 20160812 Contract record no.: 2014440020423 Assignee after: Shenzhen excellent photoelectric Co., Ltd. Assignee before: GUANGDONG JIJIA PHOTOELECTRIC TECHNOLOGY CO., LTD. |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 New Lake Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN FRECOM ELECTRONICS CO., LTD. Address before: 518129 Guangming Street, Baoan District, Shenzhen, Guangdong, Fu Fu Kang, Fuchuan science and Technology Park, Fu Yuan Industrial Park. Patentee before: SHENZHEN FRECOM ELECTRONICS CO., LTD. |
|
| CP02 | Change in the address of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100811 |
|
| CX01 | Expiry of patent term |