CN203761071U - DC watthour meter for mobile power source - Google Patents
DC watthour meter for mobile power source Download PDFInfo
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- CN203761071U CN203761071U CN201320803119.3U CN201320803119U CN203761071U CN 203761071 U CN203761071 U CN 203761071U CN 201320803119 U CN201320803119 U CN 201320803119U CN 203761071 U CN203761071 U CN 203761071U
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- resistance
- power source
- direct current
- interface
- hour meter
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Abstract
The utility model discloses a DC watthour meter for a mobile power source. The DC watthour meter comprises a micro control unit, a detection unit, a power receiving device interface, at least one power supply device interface, a display unit and a storage unit; the detection unit detects an input voltage and a voltage difference which is formed between two ends of a resistor; the micro control unit obtain in a real-time manner an input voltage of the detection unit and a voltage difference at the two ends of the resistor; the power receiving device interface is externally connected with a power receiving device and is connected to one end of the detection resistor; the power supply device interface is externally connected with a power supply device and is connected to the other end the detection resistor; the display unit displays charge / discharge information of the mobile power source; and the charge / discharge information of the mobile power source is stored in the storage unit. In the utility model, the DC watthour meter can display the charge / discharge information of the mobile power source in the real time manner, and can prevent the charge / discharge information from loss after the power failure.
Description
Technical field
The utility model relates to direct current watt hour meter, relates in particular to a kind of direct current watt hour meter that is applicable to portable power source.
Background technology
Along with being widely used of smart mobile phone and panel computer, consumer is increasing to the demand of portable power source, but when external equipment is to portable power source charging or portable power source during to other-end equipment charge, consumer does not also know the charge/discharge information of portable power source, and wherein charge information refers to input voltage, input current and input power when external equipment charges to portable power source; Input voltage, input current and input power when discharge information refers to portable power source to other-end equipment charge.
Utility model content
The purpose of this utility model is to provide a kind of direct current watt hour meter that is applicable to portable power source, to show in real time the charge/discharge information of portable power source, also has the function that prevents that charge/discharge information from losing after power down.
For achieving the above object, the utility model proposes a kind of direct current watt hour meter that is applicable to portable power source, described direct current watt hour meter comprises a micro-control unit, a detecting unit, and a power receiving equipment interface and at least one power supply unit interface, wherein:
Described detecting unit, is configured to the voltage difference that detects input voltage and detect resistance two ends;
Described micro-control unit, the voltage difference that is configured to the input voltage in Real-time Obtaining detecting unit and detects resistance two ends;
Described power receiving equipment interface, is configured to external power receiving equipment and is connected to one end of described detection resistance;
Described power supply unit interface, is configured to external power supply unit and is connected to the other end of described detection resistance.
Preferably, described micro-control unit is configured to calculate input current and input power according to the voltage difference at described input voltage and detection resistance two ends.
Preferably, described direct current watt hour meter also comprises a display unit, and described display unit is connected with described micro-control unit communication, is configured to show at least one in input voltage, input current and input power.
Preferably, described micro-control unit comprises the first button and the second button, is configured to control the displaying contents of described display unit.
Preferably, described direct current watt hour meter also comprises a memory cell, and described memory cell is connected with described micro-control unit communication, is configured to store at least one in input voltage, input current and input power.
Preferably, described direct current watt hour meter also comprises a voltage regulation unit, and described voltage regulation unit is connected with described micro-control unit and described memory cell, and being configured to provides the voltage after voltage stabilizing to it.
Preferably, described direct current watt hour meter comprises two power supply unit interfaces, i.e. DC power supply interface and MICRO interface.
Preferably, when the rated current of described portable power source is greater than 2A, adopt described DC power supply interface; When the rated current of described portable power source is less than 2A, adopt described MICRO interface.
Preferably, the physical circuit of described detecting unit comprises:
The first resistance of series connection and one end of the second resistance are connected to described power supply unit interface and the tie point that detects resistance, its other end ground connection;
From the mid point of the first resistance and the second resistance, draw the second electric capacity in parallel with the second resistance, and draw the in-phase input end that line is connected to the first operational amplifier;
The inverting input of the first operational amplifier is connected to its output;
The output of the first operational amplifier is connected to the inverting input of the second operational amplifier through the 11 resistance, and the output that is connected to the second operational amplifier through the 5th electric capacity and the 6th resistance of parallel connection;
The 3rd resistance of series connection and one end of the 4th resistance are connected to described power receiving equipment interface and the tie point that detects resistance, its other end ground connection;
From the mid point of the 3rd resistance and the 4th resistance, draw the 4th electric capacity in parallel with the 4th resistance, and draw the in-phase input end that line is connected to the second operational amplifier.
The beneficial effects of the utility model are that the related direct current watt hour meter of the utility model can be applicable to the portable power source of different size, show in real time the charge/discharge information of portable power source, and can pass through button switching display content, can also prevent that charge/discharge information from losing after power down.
Accompanying drawing explanation
Fig. 1 shows the structured flowchart of the related direct current watt hour meter of the utility model.
Fig. 2 shows the input/output interface circuit of the related direct current watt hour meter of the utility model.
Fig. 3 shows the testing circuit of the related direct current watt hour meter of the utility model.
Fig. 4 shows the micro control unit circuit schematic diagram of the related direct current watt hour meter of the utility model.
Fig. 5 shows the voltage stabilizing circuit of the related direct current watt hour meter of the utility model.
Fig. 6 shows the memory circuit of the related direct current watt hour meter of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, the direct current watt hour meter that be applicable to portable power source related according to the utility model comprises micro-control unit 10, detecting unit 20, voltage regulation unit 30, memory cell 40, display unit 50, first interface 60, the second interfaces 70 and the 3rd interface 80.Wherein micro-control unit 10 respectively with detecting unit 20, voltage regulation unit 30, memory cell 40, display unit 50 is connected; The voltage that voltage regulation unit 30 is supplied with external power supply unit carries out being supplied to micro-control unit 10 and memory cell 40 after voltage stabilizing; Detecting unit 20 is connected to the two ends of detecting resistance R 5; After being connected in parallel, first interface 60 and the second interface 70 is connected to one end of detecting resistance R 5; The 3rd interface 80 is connected to the other end that detects resistance R 5.
As shown in Figure 2, first interface 60 is the direct current input interface of 5V preferably for concrete input/output interface circuit, and the second interface 70 is the MICRO input interface of 5V five pins preferably, and the 3rd interface 80 is the USB output interface of four pins preferably.First interface 60 and the second interface 70 are connected in parallel, by being connected to after the first capacitor C 1 filtering, detect resistance R 5, detect resistance R 5 the 3rd capacitor C 3 that has been connected in parallel, through parallel circuits, be connected to afterwards the first pin and the 4th pin of the 3rd interface 80, described parallel circuits is by the 6th capacitor C 6, the 7th capacitor C 7, the series arm of the 7th resistance R 7 and the 8th resistance R 8, the series arm of the 9th resistance R 9 and the tenth resistance R 10 forms, from the mid point of series arm the 7th resistance R 7 and the 8th resistance R 8, draw the second pin that line is connected to the 3rd interface 80, from the mid point of series arm the 9th resistance R 9 and the tenth resistance R 10, draw the 3rd pin that line is connected to the 3rd interface 80.
The portable power source of selling in the market generally all has and three interfaces that interface is corresponding in above-mentioned input/output interface circuit.
When portable power source is during as power receiving equipment, described portable power source is connected to the 3rd interface 80, according to the rated current of described portable power source, select to adopt first interface 60 or the external power supply unit of the second interface 70, concrete when the rated current of described portable power source is greater than 2A, adopt the external 5V DC power supply of first interface 60; When the rated current of described portable power source is less than 2A, adopt the external 5VMICRO power supply unit of the second interface 70, and the A potential value V of ordering
aas input voltage value, B point potential value V
bas output voltage values, as shown in Figure 2.
When portable power source is during as power supply unit, according to the rated current of described portable power source, select to adopt first interface 60 or the second interface 70, specifically, when the rated current of described portable power source is greater than 2A, adopt the external described portable power source of first interface 60; When the rated current of described portable power source is less than 2A, adopt the external described portable power source of the second interface 70, the external power receiving equipment of the 3rd interface 80, such as intelligent mobile terminal etc., and A point potential value V
aas input voltage value, B point potential value V
bas output voltage values, as shown in Figure 2.
The portable power source of take below describes as example as power receiving equipment.
Concrete testing circuit as shown in Figure 3, adopts two LM358 operational amplifier U2 in this testing circuit, wherein the first operational amplifier U2A is as voltage follower, and the second operational amplifier U2B is as subtracter.The first resistance R 1 of series connection and an end of the second resistance R 2 are connected to the A point of input/output interface circuit, its other end ground connection, from the mid point C of the first resistance R 1 and the second resistance R 2, draw the second capacitor C 2 in parallel with the second resistance R 2, and draw the in-phase input end that line is connected to the first operational amplifier U2A, the anti-phase input of the first operational amplifier U2A is connected to its output and becomes voltage follower, the output of the first operational amplifier U2A is connected to the inverting input of the second operational amplifier U2B through the 11 resistance R 11, and the output that is connected to the second operational amplifier U2B through the 5th capacitor C 5 and the 6th resistance R 6 of parallel connection, the 3rd resistance R 3 of series connection and an end of the 4th resistance R 4 are connected to the B point of input/output interface circuit, its other end ground connection, from the mid point D of the 3rd resistance R 3 and the 4th resistance R 4, draw the 4th capacitor C 4 in parallel with the 4th resistance R 4, and draw the in-phase input end that line is connected to the second operational amplifier U2B, the second operational amplifier U2B voltage V that B is ordered in input/output interface circuit
bpower supply, the output V of the second operational amplifier U2B
oICCbe the voltage difference that detects resistance R 5 two ends.
Micro control unit circuit schematic diagram as shown in Figure 4, the micro-control unit chip U3 of this micro control unit circuit adopts UPD78F9212 type micro-control unit chip, the 5th pin of described micro-control unit chip U3 is connected to voltage regulation unit 30, by voltage regulation unit 30, supplies with 3V electricity; Its 4th pin ground connection; The 6th pin SCK and the 7th pin SDA of described micro-control unit chip U3 are I
2c bus interface, above-mentioned two pins are connected to display unit 50; The 14 pin SCL1 and the 15 pin SDA1 of described micro-control unit chip U3 are also I
2c bus interface, above-mentioned two pins are connected to memory cell 40; The 9th pin of described micro-control unit chip U3 is connected to the C point in testing circuit, the voltage V of this point
iNbe the input voltage in charge information; The 16 pin of described micro-control unit chip U3 is connected to the output of the second operational amplifier U2B in testing circuit, the voltage V of this end
oICCbe the voltage difference that detects resistance R 5 two ends, pass through Ohm's law: I=V
oICC/ R5, has just obtained the input current in charge information; The tenth pin of described micro-control unit chip U3 is by the second button S2 ground connection; The 11 pin of described micro-control unit chip U3 is by the first button S1 ground connection.
As shown in Figure 5, the voltage stabilizing chip U1 of this voltage stabilizing circuit adopts XC6206 to voltage stabilizing circuit, and the second pin of described voltage stabilizing chip U1 is connected to external power supply unit; Its 3rd pin ground connection; Its first pin exports the voltage VCC after voltage stabilizing to micro-control unit 10 and memory cell 40.
As shown in Figure 6, the storage chip U4 of this memory circuit adopts 24C02 to memory circuit, and first, five, six, seven, eight pins of described storage chip U4 are connected to the first pin of voltage stabilizing chip U1; Second and third of described storage chip U4, four pin ground connection; And the 6th pin SCL1 of described storage chip U4 is connected to the 14 pin SCL1 of described micro-control unit chip U3, the 5th pin SDA1 of described storage chip U4 is connected to the 15 pin SDA1 of described micro-control unit chip U3.
Described display unit 50 adopts LCD12864 display.
Each related element circuit of the utility model shares same earth point.
Concrete operation principle is: the rated current of supposing described portable power source is less than 2A, adopts the external 5VMICRO power supply unit of the second interface 70, the external described portable power source of the 3rd interface 80.
The voltage V that described micro-control unit chip U3 is ordered by C in the 9th pin Real-time Obtaining testing circuit
iN, obtain the input voltage in charge information; By the output end voltage V of the second operational amplifier U2B in the 16 pin Real-time Obtaining testing circuit
oICC, detect the voltage difference at resistance R 5 two ends, pass through Ohm's law: I=V
oICC/ R5, has just obtained the input current in charge information; When the external 5VMICRO power supply unit of the second interface 70, the timer of described micro-control unit chip U3 starts to record charging interval T; By above-mentioned input voltage V
iN, input current I and charging interval T, just can draw charge capacity W.Described micro-control unit 10 passes through I by above-mentioned charge information in real time
2c bus transfer, to memory cell 40 and display unit 50, shows by the LCD12864 in display unit 50, in order to prevent that charge information from losing after power down, therefore charge information stored in storage chip U4.In addition user can also control by the first button S1 in micro-control unit 10 and the second button S2 the displaying contents of display unit 50, short this charge information that shows by the first button S1 for example, shortly press the charge information that the second button S2 shows last time, longly by the second button S2, remove the content on display.
The related direct current watt hour meter of the utility model can show the charge/discharge information of portable power source in real time, and can pass through button switching display content, can also prevent that charge/discharge information from losing after power down.
Claims (8)
1. be applicable to a direct current watt hour meter for portable power source, it is characterized in that: described direct current watt hour meter comprises a micro-control unit, a detecting unit, a power receiving equipment interface and at least one power supply unit interface, wherein:
Described detecting unit, is configured to the voltage difference that detects input voltage and detect resistance two ends;
Described micro-control unit, the voltage difference that is configured to the input voltage in Real-time Obtaining detecting unit and detects resistance two ends;
Described power receiving equipment interface, is configured to external power receiving equipment and is connected to one end of described detection resistance;
Described power supply unit interface, is configured to external power supply unit and is connected to the other end of described detection resistance.
2. the direct current watt hour meter that is applicable to portable power source according to claim 1, it is characterized in that: described direct current watt hour meter also comprises a display unit, described display unit is connected with described micro-control unit communication, is configured to show at least one in input voltage, input current and input power.
3. the direct current watt hour meter that is applicable to portable power source according to claim 2, is characterized in that: described micro-control unit comprises the first button and the second button, is configured to control the displaying contents of described display unit.
4. the direct current watt hour meter that is applicable to portable power source according to claim 1, it is characterized in that: described direct current watt hour meter also comprises a memory cell, described memory cell is connected with described micro-control unit communication, is configured to store at least one in input voltage, input current and input power.
5. the direct current watt hour meter that is applicable to portable power source according to claim 4, it is characterized in that: described direct current watt hour meter also comprises a voltage regulation unit, described voltage regulation unit is connected with described micro-control unit and described memory cell, and being configured to provides the voltage after voltage stabilizing to it.
6. the direct current watt hour meter that is applicable to portable power source according to claim 1, is characterized in that: described direct current watt hour meter comprises two power supply unit interfaces, i.e. DC power supply interface and MICRO interface.
7. the direct current watt hour meter that is applicable to portable power source according to claim 6, is characterized in that: when the rated current of described portable power source is greater than 2A, adopt described DC power supply interface; When the rated current of described portable power source is less than 2A, adopt described MICRO interface.
8. the direct current watt hour meter that is applicable to portable power source according to claim 1, is characterized in that: the physical circuit of described detecting unit comprises:
The first resistance of series connection and one end of the second resistance are connected to described power supply unit interface and the tie point that detects resistance, its other end ground connection;
From the mid point of the first resistance and the second resistance, draw the second electric capacity in parallel with the second resistance, and draw the in-phase input end that line is connected to the first operational amplifier;
The inverting input of the first operational amplifier is connected to its output;
The output of the first operational amplifier is connected to the inverting input of the second operational amplifier through the 11 resistance, and the output that is connected to the second operational amplifier through the 5th electric capacity and the 6th resistance of parallel connection;
The 3rd resistance of series connection and one end of the 4th resistance are connected to described power receiving equipment interface and the tie point that detects resistance, its other end ground connection;
From the mid point of the 3rd resistance and the 4th resistance, draw the 4th electric capacity in parallel with the 4th resistance, and draw the in-phase input end that line is connected to the second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320803119.3U CN203761071U (en) | 2013-12-09 | 2013-12-09 | DC watthour meter for mobile power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320803119.3U CN203761071U (en) | 2013-12-09 | 2013-12-09 | DC watthour meter for mobile power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761071U true CN203761071U (en) | 2014-08-06 |
Family
ID=51256308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320803119.3U Withdrawn - After Issue CN203761071U (en) | 2013-12-09 | 2013-12-09 | DC watthour meter for mobile power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203761071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607028A (en) * | 2013-12-09 | 2014-02-26 | 深圳市迪比科电子科技有限公司 | Direct current watt hour meter suitable for portable power source |
-
2013
- 2013-12-09 CN CN201320803119.3U patent/CN203761071U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607028A (en) * | 2013-12-09 | 2014-02-26 | 深圳市迪比科电子科技有限公司 | Direct current watt hour meter suitable for portable power source |
| CN103607028B (en) * | 2013-12-09 | 2015-08-05 | 深圳市迪比科电子科技有限公司 | A kind of direct current watt hour meter being applicable to portable power source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20150805 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20150805 |
|
| RGAV | Abandon patent right to avoid regrant |