CN203553999U - USB charging device - Google Patents
USB charging device Download PDFInfo
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- CN203553999U CN203553999U CN201320646496.0U CN201320646496U CN203553999U CN 203553999 U CN203553999 U CN 203553999U CN 201320646496 U CN201320646496 U CN 201320646496U CN 203553999 U CN203553999 U CN 203553999U
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Abstract
The utility mode relates to the electronic circuit technology field, and especially relates to a USB charging device. The USB charging device is composed of a power supply filtering unit, a voltage division unit, a soft start unit, a low-voltage alarm unit, an inverting unit, a post-filtering unit and an output unit. The USB charging device is reasonable in circuit structure, the soft start method and the low-voltage alarm unit are used, over discharge of a DC power source can be prevented, the input DC power source can be effectively protected, and therefore circuit operation stability can be improved; the power supply filtering unit and the post-filtering unit are used for simultaneously filtering at an input terminal and an output terminal of a circuit, an AC pulse ripple factor is reduced, and smooth DC power source voltage can be output through a USB mother seat; and if a green light emitting diode lights, power generation of the USB charging device is indicated to be normal after boost.
Description
Technical field
The utility model relates to electronic circuit technology field, particularly a kind of USB charging device.
Background technology
The USB charging device of small-sized electronic product is of a great variety at present; general boost chip or the single-chip microcomputer cooperation peripheral circuit composition of adopting more; this scheme circuit is to meet the higher electronic product of stability requirement often to need separately to join a block power supply baffle; cause circuit structure comparatively complicated, circuit volume is relatively large and cost is higher.
Summary of the invention
For addressing the above problem, it is a kind of simple in structure that the purpose of this utility model is to provide, and circuit volume is little, with a kind of USB charging device of low pressure alarming.
The utility model solves the technical scheme that its technical problem adopts: power supply filter unit, partial pressure unit, soft start unit, low pressure alarming unit, inversion unit, post-filtering unit and output unit, consist of; Described power supply filter unit comprises after the source-series K switch of input dc power, is connected in parallel and forms feeder ear A after filtering with capacitor C 4, capacitor C 5, and capacitor C 4 is connected ground connection afterwards with capacitor C 5 negative pole pin; Described partial pressure unit comprises after filtering that feeder ear A and resistance R 1, resistance R 2 are connected in series rear ground connection; Described soft start unit comprises after filtering that feeder ear A and capacitor C 2, resistance R 6 are connected in series rear ground connection; Described low pressure alarming unit comprises feeder ear A after filtering and is connected with the boost pok pin of chip U1 of DC-DC after red light emitting diodes LED1, resistance R 4 series connection; Described inversion unit comprises the DC-DC chip U1 that boosts, boost clk/sel pin, the ain pin of chip U1 of DC-DC is all electrically connected with feeder ear A after filtering, ground connection after ref pin is connected with capacitor C 3, on pin is connected between the capacitor C 2 and resistance R 6 of soft start unit; Pokin pin is connected between the resistance R 1 and resistance R 2 of partial pressure unit; The boost lxn pin of chip U1 of DC-DC is connected Hou Yi road and is connected with energy storage inductor L1 one end with lxp pin, the energy storage inductor L1 other end is connected to after filtering between feeder ear A, red light emitting diodes LED1; Another road is connected with the anodal pin of diode D1, and diode D1 negative pole pin and resistance R 3, capacitor C 1 are connected in series rear ground connection; The boost out pin of chip U1 of DC-DC is connected between resistance R 3 and capacitor C 1, and pout pin is connected between diode D1 and resistance R 3, forms the voltage output end B after boosting.Described post-filtering unit comprise voltage output end B be connected in parallel with capacitor C 6, capacitor C 7 respectively after ground connection.Described output unit comprises that voltage output end B and resistance R 5, green LED LED2 are connected in series rear ground connection, and voltage output end B output voltage, after post-filtering unit filtering, meets USB female seat J1.
The utility model compared with prior art has the following advantages and beneficial effect: in circuit, the element such as resistance, electric capacity is all the element that adopts patch-type, can effectively reduce circuit volume, reduces costs.Circuit structure is reasonable, adopts soft starting mode and low pressure alarming unit, effectively protects input DC power, prevents from that power supply from crossing to put, thereby improves circuit working stability.The utility model utilization power supply filter unit and post-filtering unit and output unit, make circuit input end and output carry out filtering, to reduce, exchange pulse ripple coefficient, by USB female seat, to subordinate's load device, provide direct voltage after level and smooth boosting, now green LED is lighted, and after showing to boost, generating is normal.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
With reference to Fig. 1, the utility model is comprised of the filter unit of powering, partial pressure unit, soft start unit, low pressure alarming unit, inversion unit, post-filtering unit and output unit.
Power supply filter unit comprises that input DC power BT connects after a K switch, forms feeder ear A after filtering with capacitor C 4, capacitor C 5 after being connected in parallel, and capacitor C 4 is connected ground connection afterwards with capacitor C 5 negative pole pin.Power supply filter unit adopts capacitor C 4 structure in parallel with capacitor C 5, has improved the reliability of circuit working, if having after a capacitance open circuit, another electric capacity still can carry out filtering, and circuit still can be worked, and effectively prevents serious AC fault.
Partial pressure unit comprises after filtering that feeder ear A and resistance R 1, resistance R 2 are connected in series rear ground connection.
Soft start unit comprises after filtering that feeder ear A and capacitor C 2, resistance R 6 are connected in series rear ground connection.During input DC power place in circuit; by resistance R 6, capacitor C 2 is charged; DC-DC boosts on the on pin of chip U1 after voltage is gradually varied to 0; the DC-DC chip U1 that boosts is activated into operating state; avoid the moment of power supply access excessive to the impact of DC power supply, realize protection input DC power object.
Low pressure alarming unit comprises feeder ear A after filtering and is connected with the boost POK pin of chip U1 of DC-DC after red light emitting diodes LED1, resistance R 4 series connection.
Inversion unit comprises the DC-DC chip U1 that boosts, and boost clk/sel pin, the ain pin of chip U1 of DC-DC is all electrically connected with feeder ear A after filtering, ground connection after ref pin is connected with capacitor C 3, and on pin is connected between the capacitor C 2 and resistance R 6 of soft start unit; Pokin pin is connected between the resistance R 1 and resistance R 2 of partial pressure unit; The boost lxn pin of chip U1 of DC-DC is connected Hou Yi road and is connected with energy storage inductor L1 one end with lxp pin, the energy storage inductor L1 other end is connected to after filtering between feeder ear A, red light emitting diodes LED1; Another road is connected with the anodal pin of diode D1, and diode D1 negative pole pin and resistance R 3, capacitor C 1 are connected in series rear ground connection; The boost out pin of chip U1 of DC-DC is connected between resistance R 3 and capacitor C 1, and pout pin is connected between diode D1 and resistance R 3, forms the voltage output end B after boosting.Post-filtering unit comprise voltage output end B be connected in parallel with capacitor C 6, capacitor C 7 respectively after ground connection.Output unit comprises that voltage output end B and resistance R 5, green LED LED2 are connected in series rear ground connection, and voltage output end B output voltage, after post-filtering unit filtering, meets USB female seat J1.When DC-DC boosts after the built-in metal-oxide-semiconductor closure of chip U1, energy storage inductor L1 converts electrical energy into magnetic field energy and stores, diode D1 plays buffer action, and when DC-DC boost the built-in metal-oxide-semiconductor of chip U1 disconnect after energy storage inductor L1 the magnetic field energy of storage is converted to electric energy, the voltage that is voltage output end B is that the stack that the magnetic figured stone of input DC power BT voltage and energy storage inductor L1 can be converted to electric energy forms afterwards, therefore output voltage V out is higher than input voltage, complete the process of boosting, the post-filtering unit forming through the capacitor C 6 by being connected in parallel and capacitor C 7 again, filter AC ripple, by USB female seat J1, to subordinate's load device, provide galvanic current to press Vout, and green LED LED2 lights, after showing to boost, generating is normal.
The DC-DC chip U1 that boosts adopts the chip MAX1703 that boosts of Maxim, this built-in chip type metal-oxide-semiconductor, diode D1 adopts operating current to be greater than the HF schottky diode of 1A, as SS34 model diode, to guarantee boosting the built-in metal-oxide-semiconductor of chip U1 while turn-offing as DC-DC, energy storage inductor L1 can provide enough large electric current to resistance R 3 and capacitor C 1 fast.Capacitor C 4 and capacitor C 6 adopt the paster tantalum electric capacity of 7343 encapsulation, and capacitor C 5 is the high frequency capacitance of 1206 encapsulation with capacitor C 7.
During use, input DC power is after the power supply of power supply filtering unit filters, after partial pressure unit dividing potential drop, receive the boost pokin pin of chip U1 of DC-DC, if being less than low pressure, pokin pin access voltage limits minimum value as 1.25V, the DC-DC pok pin output low level of chip U1 of boosting, red light emitting diodes LED1 lights, alarm input DC power low voltage, preventing that input DC power from crossing puts, and effectively guarantees circuit stability.
Claims (4)
1. a USB charging device, is characterized in that being comprised of power supply filter unit, partial pressure unit, soft start unit, low pressure alarming unit, inversion unit, post-filtering unit and output unit;
Described power supply filter unit comprises after the source-series switch of input dc power (K), is connected in parallel and forms feeder ear A after filtering with electric capacity (C4), electric capacity (C5), and electric capacity (C4) is connected ground connection afterwards with electric capacity (C5) negative pole pin;
Described partial pressure unit comprises after filtering that feeder ear A and resistance (R1), resistance (R2) are connected in series rear ground connection;
Described soft start unit comprises after filtering that feeder ear A and electric capacity (C2), resistance (R6) are connected in series rear ground connection;
Described low pressure alarming unit comprises feeder ear A after filtering and is connected with the boost pok pin of chip (U1) of DC-DC after red light emitting diodes (LED1), resistance (R4) series connection;
Described inversion unit comprises the DC-DC chip (U1) that boosts, boost clk/sel pin, the ain pin of chip (U1) of DC-DC is all electrically connected with feeder ear A after filtering, ground connection after ref pin is connected with electric capacity (C3), on pin is connected between the electric capacity (C2) and resistance (R6) of soft start unit; Pokin pin is connected between the resistance (R1) and resistance (R2) of partial pressure unit; The boost lxn pin of chip (U1) of DC-DC is connected Hou Yi road and is connected with energy storage inductor (L1) one end with lxp pin, energy storage inductor (L1) other end is connected between feeder ear A after filtering, red light emitting diodes (LED1); Another road is connected with the anodal pin of diode (D1), and diode (D1) negative pole pin and resistance (R3), electric capacity (C1) are connected in series rear ground connection; The boost out pin of chip (U1) of DC-DC is connected between resistance (R3) and electric capacity (C1), pout pin is connected between diode (D1) and resistance (R3), forms the voltage output end B after boosting;
Described post-filtering unit comprise voltage output end B be connected in parallel with electric capacity (C6), electric capacity (C7) respectively after ground connection;
Described output unit comprises that voltage output end B and resistance (R5), green LED (LED2) are connected in series rear ground connection, and voltage output end B output voltage, after post-filtering unit filtering, connects USB female seat (J1).
2. a kind of USB charging device according to claim 1, is characterized in that: described DC-DC boosts, and can to adopt model be the MAX1703 chip that boosts to chip (U1).
3. a kind of USB charging device according to claim 1, is characterized in that: described diode (D1) adopts operating current to be greater than the HF schottky diode of 1A.
4. a kind of USB charging device according to claim 1, it is characterized in that: described electric capacity (C4) adopts the 7343 paster tantalum electric capacity that encapsulate with electric capacity (C6), and electric capacity (C5) is the high frequency capacitance of 1206 encapsulation with electric capacity (C7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320646496.0U CN203553999U (en) | 2013-10-21 | 2013-10-21 | USB charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320646496.0U CN203553999U (en) | 2013-10-21 | 2013-10-21 | USB charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203553999U true CN203553999U (en) | 2014-04-16 |
Family
ID=50472068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320646496.0U Expired - Fee Related CN203553999U (en) | 2013-10-21 | 2013-10-21 | USB charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203553999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107780070A (en) * | 2016-08-26 | 2018-03-09 | 天津市中马骏腾精密机械制造有限公司 | A kind of Intelligent sewing machine with mobile phone charging function |
-
2013
- 2013-10-21 CN CN201320646496.0U patent/CN203553999U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107780070A (en) * | 2016-08-26 | 2018-03-09 | 天津市中马骏腾精密机械制造有限公司 | A kind of Intelligent sewing machine with mobile phone charging function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20141021 |
|
| EXPY | Termination of patent right or utility model |