CN103116241B - Power supply circuit, chip and monitoring equipment - Google Patents
Power supply circuit, chip and monitoring equipment Download PDFInfo
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- CN103116241B CN103116241B CN201210504107.0A CN201210504107A CN103116241B CN 103116241 B CN103116241 B CN 103116241B CN 201210504107 A CN201210504107 A CN 201210504107A CN 103116241 B CN103116241 B CN 103116241B
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Abstract
The invention provides a power supply circuit, a chip and monitoring equipment. The power supply circuit, the chip and the monitoring equipment are simple in structure and low in cost. The power supply circuit comprises a first input voltage source, a second input voltage source, a first switch, a second switch, a third switch, a fourth switch, a first power supply node and a second power supply node. The first input voltage source is connected with the first power supply node through the first switch, the second power supply node is in a drop-down ground connection through the second switch, the second input voltage source is connected with the second power supply node through the second switch, and the first power supply node is in a drop-down ground connection through the fourth switch. A positive power supply path is formed by the first input voltage source, the first switch, the first power supply node, the second power supply node, and the third switch. A reverse power supply path is formed by the second input voltage source, the second switch, the second power supply node, the first power supply node, and the third switch. The power supply circuits are arranged in both the chip and the monitoring equipment in a matched mode.
Description
Technical field
The present invention relates to electronic applications, particularly relate to a kind of feed circuit, chip and watch-dog.
Background technology
At monitoring trade, in various photoenvironment, image clearly how is all provided to be the basic demand to watch-dog.Wherein, how all to provide in round the clock the monitoring image of high-quality be always this field pay close attention to one in.At present, a kind of comparatively conventional method in monitoring trade uses two optical-filter switcher (Infra-Red-CUT, IR-CUT) exactly.Two optical-filter switcher comprises two optical filters and power section.Described two optical filters comprise a slice infrared absorption optical filter, and a slice full impregnated spectral filter.When being in daytime or the sufficient environment of light, infrared absorption optical filter is moved to camera lens place by the power section of described pair of optical-filter switcher, can obtain real color to make watch-dog; When in the environment being in night or insufficient light, then described infrared absorption optical filter is removed by the power section of described pair of optical-filter switcher, can make full use of all light in environment to make watch-dog.
In order to realize the way moving of infrared absorption optical filter, just need to provide the drive circuit in bi-directional with enough driving forces.。
Summary of the invention
In view of this, for demand of the prior art, the invention provides a kind of feed circuit, chip and watch-dog.
First aspect, the embodiment of the present invention provides a kind of feed circuit, comprises the first input voltage source, the second input voltage source, the 3rd input voltage source, the first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the first supply node and the second supply node.Wherein, described first switch and second switch are metal-oxide-semiconductor, and the 3rd switch, the 4th switch and the 5th switch are triode.First input voltage source connects with the source electrode of the first switch, and the grid of described first switch connects with the collector of the 3rd switch, and the drain electrode of described first switch connects with the first supply node.Described second input voltage source connects with the source electrode of second switch, and the grid of described second switch also connects with the collector of the 4th switch, and the drain electrode of second switch connects with the second supply node.The base stage of described 3rd switch connects with described control voltage source, and the drop-down ground connection of base stage of described 3rd switch.The grounded emitter of described 3rd switch, the collector of described 3rd switch also connects with the second supply node except connecting with the grid of described first switch.The grounded emitter of described 4th switch, the base stage of described 4th switch connects with the collector of described 3rd input voltage source, described 5th switch, and the collector of described 4th switch also connects with the first supply node except connecting with the grid of second switch.The base stage of the 5th switch connects with described control voltage source, and the drop-down ground connection of base stage of described 5th switch, the grounded emitter of described 5th switch.Described control voltage source connects with the base stage of the 3rd switch, the base stage of the 5th switch, for providing forward voltage to the 3rd switch and the 5th switch.
In conjunction with first aspect, in a kind of possible implementation, described first input voltage source and described second input voltage source are that the peer of same power supply inputs.
In conjunction with first aspect and the first possible implementation above-mentioned, the voltage difference that described first input voltage comes from described second input voltage source is less than the forward voltage of described first switch and described second switch.
In conjunction with first aspect and above-mentioned possible implementation, in the implementation that the second is possible, the magnitude of voltage of described first input voltage source meets the turn-on condition of described first switch; The magnitude of voltage of described second input voltage source meets the turn-on condition of described second switch; The magnitude of voltage of described 3rd input voltage source should meet the turn-on condition of described 4th switch.
In conjunction with first aspect and above-mentioned possible implementation; in the implementation that the third is possible; described feed circuit also comprise the first protection circuit and the second protection circuit; described first protection circuit and described second protection circuit include RC delay circuit and diode continuousing flow loop; described first protection circuit for reducing described 3rd switch conducting speed and improve the opening velocity of described 3rd switch, described second protection circuit for reducing described 4th switch conducting speed and improve the opening velocity of described 4th switch.
In conjunction with first aspect and above-mentioned possible implementation; in the 4th kind of possible implementation; described first protection circuit comprises the first resistance, the first diode and the first electric capacity; described first resistance is located between the base stage of described control voltage source and described 3rd switch; described first diode and described first resistor coupled in parallel; and the P of described first diode end connects with the base stage of described 3rd switch; the N of described first diode holds drop-down ground connection; one end of described first electric capacity connects with the base stage of described 3rd switch, other end ground connection.Described second protection circuit comprises the second resistance, the second diode and the second electric capacity; described second resistance is located between the base stage of described control voltage source and described 4th switch; described second diode and described second resistor coupled in parallel; and the P of described second diode end connects with the base stage of described 4th switch; the N of described second diode holds drop-down ground connection; one end of described second electric capacity connects with the base stage of described 4th switch, other end ground connection.
In second aspect, the present invention also provides a kind of chip applying the feed circuit of above-mentioned first aspect and each possible implementation.
In the third aspect, the present invention also provides also provides a kind of watch-dog applying the feed circuit of above-mentioned first aspect and each possible implementation.
Feed circuit provided by the invention just can realize the output of bidirectional current easily by a control voltage input source, structure is simple, and also can be realized by discrete component, cost is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1 shows that the principle schematic of the feed circuit that the embodiment of the present invention provides.
Figure 2 shows that the structural drawing of the feed circuit that the embodiment of the present invention provides.
Figure 3 shows that the structural drawing of the feed circuit that the third embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Figure 1 shows that the principle schematic of the feed circuit that the embodiment of the present invention provides.The feed circuit that the embodiment of the present invention provides are located in watch-dog, and described watch-dog comprises the two optical-filter switchers for providing filter effect for camera lens, and provide the described feed circuit of driving circuit for described pair of optical-filter switcher.Described feed circuit comprise the first input voltage source 1, second input voltage source 2, first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, first supply node P1 and the second supply node P2.As shown in Figure 1, the first supply node P1 and the second supply node P2 is used for two optical-filter switcher input current; First input voltage source 1 is connected with the first supply node P1 by the first K switch 1, and the second supply node P2 is by the drop-down ground connection of second switch K2; Second input voltage source 2 is connected with the second supply node P2 by second switch K2, and the first supply node P1 is by the drop-down ground connection of the 4th K switch 4.First input voltage source 1, first K switch 1, first supply node P1, the second supply node P2 and the 3rd K switch 3 constitute the forward supply path of two optical filtering switch; Second input voltage source 2, second switch K2, the second supply node P2, the first supply node P1 and the 3rd K switch 3 constitute the reverse supply path of two optical filtering switch.Needs to two optical filtering switch carry out forward power time, only by the first K switch 1 and the 3rd K switch 3 conducting, second switch K2 and the 4th K switch 4 need be disconnected; When needs are oppositely powered to two optical filtering switch, then only need by second switch K2 and the 4th K switch 4 conducting, the first K switch 1 and second switch disconnect.
Figure 2 shows that the Organization Chart of the feed circuit that the embodiment of the present invention provides.As shown in the figure, in embodiments of the present invention, first K switch 1 and second switch K2 are metal-oxide-semiconductor, and the 3rd K switch 3 and the 4th K switch 4 are triode, and the feed circuit that the embodiment of the present invention provides also comprise control voltage source V1, the 5th K switch 5 and the 3rd input voltage source 3.
In embodiments of the present invention, the first input voltage source 1 connects with the source electrode of the first K switch 1, and the grid of described first K switch 1 connects with the collector of the 3rd K switch 3, the second supply node P2, and the drain electrode of described first K switch 1 connects with the first supply node P1.
Described second input voltage source 2 connects with the source electrode of second switch K2, and the grid of described second switch K2 also connects with the collector of the 4th K switch 4, the first supply node P1, and the drain electrode of second switch K2 connects with the second supply node P2.
The base stage of described 3rd switch connects with described control voltage source V1, and the drop-down ground connection of base stage of described 3rd switch.The grounded emitter of described 3rd K switch 3, the collector of described 3rd K switch 3 also connects with the second supply node P2 except connecting with the grid of described first K switch 1.
The grounded emitter of described 4th K switch 4, the base stage of described 4th K switch 4 connects with the collector of described 3rd input voltage source 3, described 5th K switch 5, and the collector of described 4th K switch 4 also connects with the first supply node P1 except connecting with the grid of second switch K2.
The base stage of the 5th K switch 5 connects with described control voltage source V1, and the base stage also drop-down ground connection of described 5th K switch 5, the grounded emitter of described 5th K switch 5.
Described control voltage source V1 connects with the base stage of the 3rd K switch 3, the base stage of the 5th K switch 5, for providing forward voltage to the 3rd K switch 3 and the 5th K switch 5.
In embodiments of the present invention, the magnitude of voltage of the first input voltage source 1 should meet the condition that the first K switch 1 normally works; The magnitude of voltage of the second input voltage source 2 should meet the condition that second switch K2 normally works.The magnitude of voltage of the 3rd input voltage source 3 should meet the condition of the normal work of the 4th K switch 4.Such as, the magnitude of voltage of the first input voltage source 1 is more than or equal to the turn-on voltage of the first K switch 1.The magnitude of voltage of the second input voltage source 2 is more than or equal to the turn-on voltage of second switch K2.The magnitude of voltage of the 3rd input voltage source 3 is more than or equal to the turn-on voltage of the 4th K switch 4.
In an alternative embodiment, the first input voltage source 1 and the second input voltage source 2 can be the homopolarity input of same power supply, also can be the homopolarity input of different power supplys.But the voltage demand fulfillment that the first input voltage source 1 and the second input voltage source 2 provide, first input voltage source 1 is identical with the voltage of the second input voltage source 2, or the value of the voltage difference of the first input voltage source 1 and the second input voltage source 2 is less than the forward voltage of the first K switch 1 and second switch K2.
In embodiments of the present invention, described 3rd input voltage source 3 and the first input voltage source 1, second input voltage source 2 can use the peer of same power supply to input, at other selectable embodiment, the 3rd input voltage source 3 can adopt and input with the peer of at least one the identical power supply in described first input voltage source 1, second input voltage source 2.Further, the 3rd input voltage source 3 also can use the input of independent power supply.In any case the condition of the normal work of magnitude of voltage demand fulfillment the 4th switch 4 of the 3rd input voltage source 3, namely the magnitude of voltage of the 3rd input voltage source 3 is greater than the forward voltage of the 4th switch 4.
In normal work, the first input voltage source 1, second input voltage source 2 and the 3rd input voltage source 3 continued power.Flow into from the first supply node P1 when needing to provide to two optical-filter switcher, when the supply current that the second power supply economize on electricity P2 flows out, powered to the base stage of the 3rd K switch 3 and the 5th K switch 5 by control voltage source V1, make the collector and emitter conducting of the 3rd K switch 3, thus the grid of the first K switch 1 is by the 3rd K switch 3 ground connection, and then, the source electrode of the first K switch 1 and drain electrode conducting; Due to source electrode and the drain electrode conducting of the first K switch 1, the grid of second switch K2 connects the first input voltage source 1, and the source voltage of second switch K2 and the difference of grid voltage cannot reach forward voltage, second switch K2 not conducting; K5 collector and emitter conducting under the effect of control voltage source V1 of the 5th switch, thus the base stage of the 4th K switch 4 is by the 5th K switch 5 ground connection, the base stage of the 4th K switch 4 and the difference of emitter cannot reach or exceed turn-on voltage, the 4th switch not conducting.Can see according to description above, when being powered to the base stage of the 3rd K switch 3 and the 5th K switch 5 by control voltage source V1, first K switch 1, the 3rd K switch 3 conducting, second switch K2 and the 4th K switch 4 not conducting, the electric current that voltage source 1 inputs flows into after two filter plate switch through the first K switch 1, first supply node P1, flows out through the second supply node P2, the 3rd K switch 3.
When needing to provide sub second supply node P2 to flow into two optical-filter switcher, when the supply current of the first supply node P1 outflow, stop the power supply of control voltage source V1, then the base stage of the 3rd K switch 3 and the 5th K switch 5 can not get voltage, the 3rd K switch 3 and the 5th K switch 5 not conducting.Due to the 5th K switch 5 not conducting, the base stage of the 4th K switch 4 obtains the supply voltage of the 3rd input voltage source 3, the collector and emitter conducting of the 4th K switch 4, thus the grid of second switch K2 is by the 4th K switch 4 ground connection, the source electrode of second switch K2 and drain electrode conducting under the effect of the second input voltage source 2, now, the grid of the first K switch 1 connect the second input voltage source 2, first K switch 1 by second switch K2 cannot conducting.Can see according to description above, when control voltage source stops the base to the 3rd K switch 3 and the 5th K switch 5 to power, the electric current that the second input voltage source 2 inputs flows into after two optical-filter switcher through second switch k2, the second supply node P2 and flows out from the first supply node P1 the 4th K switch 4.
The feed circuit that the embodiment of the present invention provides just can realize the output of bidirectional current flexibly by means of only changing control voltage, can be realized by discrete part, relative to integrated circuit (IC) design, be a kind of lower-cost, bidirectional current feed circuit with bi-directional drive ability.
Certainly, feed circuit provided by the invention also can be applied in integrated circuit (IC) chip as new departure of a kind of bidirectional power supply circuit completely.
Please refer to Fig. 3, Figure 3 shows that the schematic diagram of the feed circuit described in the third embodiment of the present invention.Similarity omits the description, and relative to the feed circuit described in previous embodiment, the feed circuit of the embodiment of the present invention more comprise the first protection circuit and the second protection circuit.
First protection circuit comprises the first resistance 12, first diode 14 and the first electric capacity 16.Described first resistance 12 and described first electric capacity 16 form RC timing circuit, and for reducing the conducting speed of the 3rd K switch 3, described first diode 14 and described first resistance 12 form diode continuousing flow loop, for improving the opening velocity of the 3rd K switch 3.Concrete, described first resistance 12 is located between the base stage of described control voltage source V1 and described 3rd K switch 3, described first diode 14 is in parallel with described first resistance 12, and the P of described first diode 14 end connects with the base stage of the 3rd K switch 3, and N holds drop-down ground connection.One end of described first electric capacity 16 with the base stage of the 3rd switch k3 connect, other end ground connection.When control voltage source V1 powers, the first electric capacity 16 can slow down gathering way of the base voltage of the 3rd K switch 3, thus delays the conducting speed of the 3rd K switch 3 and the first K switch 1.And when control voltage source V1 stops power supply, the first diode 14 can improve the velocity of discharge of the base voltage of the 3rd K switch 3, the 3rd K switch 3 and the first K switch 1 is impelled to disconnect as early as possible.
Similar, the second protection circuit comprises the second resistance 22, second diode 24 and the second electric capacity 26.Described second resistance 22 and described second electric capacity 26 form RC timing circuit, and for reducing the conducting speed of the 4th K switch 4, described second diode 24 and described second resistance 22 form diode continuousing flow loop, for improving the opening velocity of the 4th K switch 4.Concrete, described second resistance 22 is located between the base stage of the 3rd input voltage source 3 and described 4th K switch 4, described second diode 24 is in parallel with described second resistance 22, and the P of described second diode 24 end connects with the base stage of the 4th K switch 4, and N holds drop-down ground connection.One end of described second electric capacity 26 with the base stage of the 4th switch k4 connect, other end ground connection.When control voltage source, V1 stops power supply, and when the 3rd input voltage source 3 is powered to the 4th K switch 4, the second electric capacity 26 can slow down gathering way of the base voltage of the 4th K switch 4, thus delays the conducting speed of the 4th K switch 3 and second switch K2.And when control voltage source V1 power make the 5th K switch 5 conducting time, the second diode 24 can improve the velocity of discharge of the base stage of the 4th K switch 4, thus impels the 4th K switch 4 and second switch K2 to disconnect as early as possible.
The first protection circuit adopting the embodiment of the present invention to provide and the second protection circuit; the conducting speed of first, second, third, fourth switch is lowered; opening velocity is enhanced; the situation of all switches conducting simultaneously when can effectively avoid direction of current to switch the initial stage, improves the reliability of circuit.
It is to be appreciated that the feed circuit that the embodiment of the present invention provides can be applied to various need bidirectional power supply chip and electron device in.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. feed circuit, it is characterized in that, comprise the first input voltage source, the second input voltage source, the 3rd input voltage source, control voltage source, the first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the first supply node and the second supply node
Wherein, described first switch and second switch are metal-oxide-semiconductor, and the 3rd switch, the 4th switch and the 5th switch are triode;
First input voltage source connects with the source electrode of the first switch, and the grid of described first switch connects with the collector of the 3rd switch, and the drain electrode of described first switch connects with the first supply node;
Described second input voltage source connects with the source electrode of second switch, and the grid of described second switch also connects with the collector of the 4th switch, and the drain electrode of second switch connects with the second supply node;
The base stage of described 3rd switch connects with described control voltage source, and the drop-down ground connection of base stage of described 3rd switch, the grounded emitter of described 3rd switch, the collector of described 3rd switch also connects with the second supply node except connecting with the grid of described first switch;
The grounded emitter of described 4th switch, the base stage of described 4th switch connects with the collector of described 3rd input voltage source, described 5th switch, and the collector of described 4th switch also connects with the first supply node except connecting with the grid of second switch;
The base stage of the 5th switch connects with described control voltage source, and the drop-down ground connection of base stage of described 5th switch, the grounded emitter of described 5th switch;
Described control voltage source connects with the base stage of the 3rd switch, the base stage of the 5th switch, for providing forward voltage to the 3rd switch and the 5th switch.
2. feed circuit as claimed in claim 1, it is characterized in that, described first input voltage source and described second input voltage source are that the peer of same power supply inputs.
3. feed circuit as claimed in claim 1, is characterized in that, the voltage difference that described first input voltage comes from described second input voltage source is less than the forward voltage of described first switch and described second switch.
4. the feed circuit according to any one of claim 1-3, is characterized in that, the magnitude of voltage of described first input voltage source meets the turn-on condition of described first switch; The magnitude of voltage of described second input voltage source meets the turn-on condition of described second switch; The magnitude of voltage of described 3rd input voltage source should meet the turn-on condition of described 4th switch.
5. the feed circuit according to any one of claim 1-3; it is characterized in that; described feed circuit also comprise the first protection circuit and the second protection circuit; described first protection circuit and described second protection circuit include RC delay circuit and diode continuousing flow loop; described first protection circuit for reducing described 3rd switch conducting speed and improve the opening velocity of described 3rd switch, described second protection circuit for reducing described 4th switch conducting speed and improve the opening velocity of described 4th switch.
6. feed circuit as described in any of claims 5, is characterized in that,
Described first protection circuit comprises the first resistance, the first diode and the first electric capacity; described first resistance is located between the base stage of described control voltage source and described 3rd switch; described first diode and described first resistor coupled in parallel; and the P of described first diode end connects with the base stage of described 3rd switch; the N of described first diode holds drop-down ground connection; one end of described first electric capacity connects with the base stage of described 3rd switch, other end ground connection
Described second protection circuit comprises the second resistance, the second diode and the second electric capacity; described second resistance is located between the base stage of described control voltage source and described 4th switch; described second diode and described second resistor coupled in parallel; and the P of described second diode end connects with the base stage of described 4th switch; the N of described second diode holds drop-down ground connection; one end of described second electric capacity connects with the base stage of described 4th switch, other end ground connection.
7. a chip, is characterized in that, described chip comprises the feed circuit according to any one of claim 1-6.
8. a watch-dog, is characterized in that, described watch-dog comprises two optical-filter switcher, and the feed circuit as described in any one of claim 1-6, and described feed circuit are used for powering to described pair of optical-filter switcher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504107.0A CN103116241B (en) | 2012-11-30 | 2012-11-30 | Power supply circuit, chip and monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210504107.0A CN103116241B (en) | 2012-11-30 | 2012-11-30 | Power supply circuit, chip and monitoring equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103116241A CN103116241A (en) | 2013-05-22 |
| CN103116241B true CN103116241B (en) | 2015-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210504107.0A Expired - Fee Related CN103116241B (en) | 2012-11-30 | 2012-11-30 | Power supply circuit, chip and monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103116241B (en) |
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| CN2896394Y (en) * | 2005-07-22 | 2007-05-02 | 公安部沈阳消防研究所 | Two-wave-band infrared flame detector |
| CN1996758A (en) * | 2006-11-24 | 2007-07-11 | 艾默生网络能源有限公司 | A bidirectional level conversion circuit |
| CN101136558A (en) * | 2006-09-02 | 2008-03-05 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and switch circuit, switch method of main power source and backup battery |
| CN201709164U (en) * | 2010-05-26 | 2011-01-19 | 南京德朔实业有限公司 | Brake control circuit for brush cutter |
| CN202385185U (en) * | 2012-01-14 | 2012-08-15 | 珠海安士佳电子有限公司 | Image color processing system for high-definition shooting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623941B2 (en) * | 1982-11-15 | 1994-03-30 | キヤノン株式会社 | Image forming apparatus controller |
| JPS61125630A (en) * | 1984-11-22 | 1986-06-13 | Toshiba Corp | Circuit for compensating drop of power supply voltage |
| JPH11196298A (en) * | 1997-12-26 | 1999-07-21 | Sony Corp | Image pickup device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634933A (en) * | 1983-12-05 | 1987-01-06 | Kabushiki Kaisha Sunpak | Photographic illumination apparatus |
| AU4556785A (en) * | 1984-07-30 | 1986-02-06 | Westinghouse Brake And Signal Company Limited | Power control circuit arrangement |
| CN2733266Y (en) * | 2004-10-10 | 2005-10-12 | 深圳市和而泰电子科技有限公司 | Semiconductor refrigerator drive circuit and control circuit |
| CN2896394Y (en) * | 2005-07-22 | 2007-05-02 | 公安部沈阳消防研究所 | Two-wave-band infrared flame detector |
| CN101136558A (en) * | 2006-09-02 | 2008-03-05 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and switch circuit, switch method of main power source and backup battery |
| CN1996758A (en) * | 2006-11-24 | 2007-07-11 | 艾默生网络能源有限公司 | A bidirectional level conversion circuit |
| CN201709164U (en) * | 2010-05-26 | 2011-01-19 | 南京德朔实业有限公司 | Brake control circuit for brush cutter |
| CN202385185U (en) * | 2012-01-14 | 2012-08-15 | 珠海安士佳电子有限公司 | Image color processing system for high-definition shooting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103116241A (en) | 2013-05-22 |
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