CN101005212A - Electronic device - Google Patents
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- CN101005212A CN101005212A CN 200710004636 CN200710004636A CN101005212A CN 101005212 A CN101005212 A CN 101005212A CN 200710004636 CN200710004636 CN 200710004636 CN 200710004636 A CN200710004636 A CN 200710004636A CN 101005212 A CN101005212 A CN 101005212A
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Abstract
The disclosed electronic equipment uses half bridge rectification circuit instead of full bridge rectification circuit in current technique. Even if electronic equipment includes some capacitors. One end of capacitor is connected to an output end of a rectification circuit; and the other end is connected to conducting material of electronic equipment possible to be touched by human; then leakage current will not be generated so as to raise user's experience for using electronic equipment.
Description
Technical field
The present invention relates to electronic technology field, particularly power technology.
Background technology
Undoubtedly, be the epoch of hand-held device now, wherein the market maximum of mobile phone, consumption maximum for this wireless device of mobile phone, guarantee its operate as normal, charging is absolutely necessary.The cell-phone charging mode has a lot, mainly is to charge by switch charger.What switch charger used is alternating current, comprises the full bridge rectifier of being made up of four diodes in charger, as shown in Figure 1.During the charger external AC power supply, alternating current this full bridge rectifier of process of input and supporting inductance capacitance etc. are transformed into higher direct voltage, pass through the conversion of control circuit and switch, inductance T1 afterwards, convert the dc low-voltage output that needs to, charge for mobile phone.In this circuit, in the time of elementary switch conduction, energy is stored among the inductance T1, secondary because the blocking-up of diode, energy can't be exported by capacitor C 4, when elementary switch turn-offs, and secondary diode current flow, be stored in the load that the energy delivery among the T1 may connect to C4 and back, in mobile phone.In addition, in the prior art,, avoid being subjected to disturbance current to influence, a safety electric capacity Y1 also is set between the primary and secondary of switch charger usually in order to make electromagnetic compatibility.One end of this safety electric capacity is communicated with the output of full bridge rectifier indirectly, and the other end may be communicated with the exposed metal parts of charger (plug that fills as the battery contact that fills with seat or trip).The alleged connection of the present invention also not only refers to directly link to each other, and is meant between two devices and has DC channel.
Because the input full bridge rectifier is alternating current, promptly in preceding half period, what import this full bridge rectifier is positive voltage, and in the back half period, what import this full bridge rectifier is negative voltage.When the input positive voltage, diode D1 and D4 conducting, the voltage of the end that this safety electric capacity Y1 links to each other with this full bridge rectifier output (A end) is higher positive voltage, in input during negative voltage, diode D1 can't UNICOM, diode D2 and D3 conducting, the A terminal voltage and the ground voltage of this safety electric capacity are close, voltage is almost nil, thus in the process of current delivery, the A of safety electric capacity Y1 end be always higher positive voltage and no-voltage alternately.
The inventor finds following problem in realizing process of the present invention, for simplifying the analysis, the impedance of supposition human body earlier can be ignored, so when the exposed metal parts of staff contact charging device, link to each other with the other end (B end) of this safety electric capacity indirectly, because human body is a ground connection, this moment, the B terminal voltage of safety electric capacity Y1 was zero, thereby produce the voltage difference of an alternation at the two ends of safety electric capacity Y1, safety electric capacity Y1 periodically charges and discharges, make the B end produce alternating current, this alternating current is leakage current.When charger used civil power, because the voltage of A end is near line voltage, so the leakage current that forms is bigger, human body can be felt, has the sensation of usually said slight electric shock, causes user's sense of discomfort.
Further, consider that again human body impedance can not ignore situation about disregarding, because the existence of human body resistance, the voltage of B end is no longer constant to be zero, but certain variation is arranged with the variation of the instant electric current (being leakage current) of the human body of flowing through, but leakage current is less because human body resistance is little, generally speaking the change in voltage amplitude of B end is not as the A end, alternating voltage difference between A, the B end still exists, and leakage current is still comparatively obvious.
Also can know according to top analysis,, also can form leakage current if live wire and zero line are exchanged,
Summary of the invention
The technical problem underlying that embodiment of the present invention will solve provides a kind of electronic equipment, the feasible leakage current that reduces electronic equipment.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of electronic equipment, comprise a half-bridge rectification circuit and an electric capacity of being made up of two diodes at least,
An output of half-bridge rectification circuit is communicated with an end of electric capacity, may be communicated with by the electric conducting material that the people touches on the other end of this electric capacity and this electronic equipment.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Use the half-bridge rectification circuit to replace full bridge rectifier of the prior art, even in electronic equipment, there is some electric capacity, the one end is communicated with an output of rectification circuit, may be communicated with by the electric conducting material that the people touches on its other end and this electronic equipment, can not produce leakage current yet, thereby promote the experience that the user uses electronic equipment.When human body contacts above-mentioned electric conducting material, if the use full bridge rectifier can make above-mentioned electric capacity produce periodic charging and discharge, thereby produce leakage current, and use the half-bridge rectification circuit can weaken this periodic charging and discharge greatly, so leakage current has also weakened greatly.
Technical scheme of the present invention can be applicable in the various electronic equipments that contain Switching Power Supply, for example in the switch charger of available portable terminal, because the application of Switching Power Supply, switch charger is very extensive, so the present invention has very big commercial value.
The half-bridge rectification circuit is a kind of common rectification circuit, can know from the textbook of this area, and with respect to full bridge rectifier, the rectification effect of half-bridge rectification circuit is not as full bridge rectifier.Because rectification effect is not good, causes in the power circuit after the rectification the having relatively high expectations of device, thereby make the cost of whole power circuit higher.So those skilled in the art generally has a kind of technology prejudice, think that the half-bridge rectification circuit is not suitable in the electronic equipment of volume production, generally use full bridge rectifier can prove this technology prejudice in the switch charger in the market.But the present inventor has abolished above-mentioned technology prejudice by discovering that half-wave rectifying circuit can reduce leakage current under certain condition, meets the theory that people-oriented at present, and has obtained better technical effect.
Description of drawings
Fig. 1 is the partial circuit schematic diagram of switch charger in the prior art;
Fig. 2 is the electronic device circuitry schematic diagram according to first embodiment of the invention;
Fig. 3 is the partial circuit schematic diagram according to the switch charger of second embodiment of the invention;
Fig. 4 is the partial circuit schematic diagram according to the switch charger of third embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
First execution mode of the present invention as shown in Figure 2.Comprised a half-bridge rectification circuit (constituting) in the electronic equipment by D1 and D4, with an electric capacity Y1, the end of electric capacity Y1 is communicated with an output of half-bridge rectification circuit directly or indirectly, may be communicated with by the electric conducting material that the people touches on the other end of this electric capacity and this electronic equipment.The input X of half-bridge rectification circuit and Y connect an AC power.Alleged connection can be directly to link to each other in the embodiment of the present invention, also can be to connect by other circuit, as long as two devices can just can on direct current in conducting.May be comprised the metal parts on the electronic equipment casing by the electric conducting material that the people touches.
The inventor through verification experimental verification, uses the half-bridge rectification circuit to replace full bridge rectifier and can reduce leakage current greatly afterwards in implementing process of the present invention.On mechanism, make a concrete analysis of in two kinds of situation below:
For simplifying the analysis, still earlier the impedance of supposition human body can be ignored, and when human body touched electric conducting material W so, because the B of electric capacity Y1 end is communicated with electric conducting material W, and human body was ground connection, so the voltage that B holds is zero.
If the X termination is live wire, the Y termination be zero line.When the X end is positive voltage, diode D1, D4 conducting, the A end of electric capacity Y1 also is a positive voltage, and voltage difference is arranged at electric capacity Y1 two ends, so electric capacity Y1 charging.When the X end was negative voltage, diode D1, D4 ended, and the electric charge that has filled on the electric capacity Y1 can't be released fast, still keeps positive voltage.So, except the X end has the charging for electric capacity Y1 in first half period of positive voltage, in other cycle of alternating current, do not embody significantly on the electric capacity Y1 and discharge and recharge, so the B end can not produce obvious alternating current, with respect to the situation of using full bridge rectifier, leakage current has reduced greatly.Though first X end has charging for electric capacity Y1 in the half period of positive voltage, the time very short (when using the 50Hz civil power is 0.01 second), electric weight is limited, and leakage current is difficult to be felt by the people.
If the X termination is zero line, then no matter Y is positive voltage or negative voltage, and the A end of electric capacity Y1 is always zero or near zero voltage (relevant with the concrete structure of other circuit), the voltage difference at Y1 two ends is little, do not have tangible charge and discharge phenomena, thereby the B end can not produce obvious alternating current yet yet.
Consider further that again human body impedance can not ignore situation about disregarding.Since the existence of human body impedance, and may also have micro-leakage current on the Y1, the voltage of B end may not exclusively be zero, but because leakage current is little, this error can be ignored, and above-mentioned analysis is still effective.
In sum, no matter how the input of half-bridge rectification circuit connects AC power, does not have tangible charge and discharge phenomena on electric capacity Y1, can not make the existence of the human body sensory of contact electric conducting material W to leakage current.
Second execution mode of the present invention has been applied in the circuit in first execution mode in the switch charger of portable terminal (as mobile phone) particularly.As shown in Figure 3, this charger comprises the half-bridge rectification circuit and the safety electric capacity Y1 that are made up of two diodes (D1 and D4), and an output of this half-bridge rectification circuit is communicated with by inductance L 1 with the end of this safety electric capacity Y1.May be communicated with by the electric conducting material that the people touches on the other end of this safety electric capacity Y1 and this charger.Also comprise switching power circuit in this charger, this Switching Power Supply comprises an inductance T1, and safety electric capacity Y1 is connected across between the primary and secondary coil of inductance T1.Wherein, may be comprised by the electric conducting material that the people touches on the charger case metal parts or with mobile phone that charger links to each other on metal parts.When charging, two inputs of this half-bridge circuit connect live wire and zero line respectively, have only drawn a kind of connected mode among Fig. 3, and the position of live wire and zero line also can be exchanged.The effect of present embodiment and the principle that tells on are identical with first execution mode.
The 3rd execution mode of the present invention is simplified the circuit in second execution mode, as shown in Figure 4, has saved capacitor C 2, but identical with second execution mode on principle.
Circuit variation to second execution mode has a variety of; the 3rd execution mode is wherein a kind of just; but these execution modes all can be used the basic scheme in first execution mode, can reach the effect that reduces leakage current more or less, so all belong to protection scope of the present invention.
The half-bridge rectification circuit is a kind of common rectification circuit, can know from the textbook of this area, and with respect to full bridge rectifier, the rectification effect of half-bridge rectification circuit is not as full bridge rectifier.Because rectification effect is not good, causes in the power circuit after the rectification the having relatively high expectations of device, thereby make the cost of whole power circuit higher.So those skilled in the art generally has a kind of technology prejudice, think that the half-bridge rectification circuit is not suitable in the electronic equipment of volume production, generally use full bridge rectifier can prove this technology prejudice in the switch charger in the market.But the present inventor has abolished above-mentioned technology prejudice by discovering that half-wave rectifying circuit can reduce leakage current under certain condition, and has obtained gratifying effect in actual tests.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. an electronic equipment is characterized in that, comprises a half-bridge rectification circuit and an electric capacity of being made up of two diodes at least,
An output of described half-bridge rectification circuit is communicated with an end of described electric capacity, may be communicated with by the electric conducting material that the people touches on the other end of this electric capacity and this electronic equipment.
2. electronic equipment according to claim 1 is characterized in that described electronic equipment is a charger, wherein comprises switching power circuit, and this Switching Power Supply comprises an inductance, and described electric capacity is the safety electric capacity between this inductance primary and secondary coil of cross-over connection.
3. electronic equipment according to claim 2 is characterized in that, described charger is the charger of mobile communication terminal.
4. according to each described electronic equipment in the claim 1 to 3, it is characterized in that the described metal parts that may be comprised by the electric conducting material that the people touches on the described electronic equipment casing.
5. switch charger, comprise switch and control circuit, safety electric capacity, it is characterized in that, described charger also comprises the half-bridge rectification circuit, one end of described safety electric capacity connects the output of described half-bridge rectification circuit, and the other end connects the electric conducting material that described charger may contact with human body, and described switch and control circuit are used to control the output of described half-bridge Output Voltage in Rectified Circuits.
6. charger according to claim 5, it is characterized in that, described half-bridge rectification circuit further comprises first diode and second diode, and described charger further comprises filter circuit, and described filter circuit is serially connected between described first diode and second diode.
7. charger according to claim 6 is characterized in that, described filter circuit comprises a filter capacitor, and described filter capacitor is serially connected between the negative pole and second diode cathode of described first diode.
8. according to claim 6 or 7 described chargers, it is characterized in that described filter circuit further comprises filter inductance, described filter inductance is serially connected between the negative pole and described safety electric capacity of described first diode.
9. according to the described charger of claim 6, it is characterized in that, described filter circuit is further for comprising LC II type filter circuit, an electric capacity in the described LC II type filter circuit is connected between the positive pole of the negative pole of described first diode and second diode, another electric capacity one end connects the positive pole of second diode, and the other end connects the negative pole of first diode by the inductance in the LC II type filter circuit.
10. charger, comprise power control circuit, safety electric capacity, it is characterized in that, described charger also comprises the half-bridge rectification circuit, one end of described safety electric capacity connects the output of described half-bridge rectification circuit, and the other end connects the electric conducting material that described charger may contact with human body, and described power control circuit is used to control the output of the output voltage of described half-bridge rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710004636A CN100595993C (en) | 2007-01-12 | 2007-01-12 | Electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710004636A CN100595993C (en) | 2007-01-12 | 2007-01-12 | Electronic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101005212A true CN101005212A (en) | 2007-07-25 |
| CN100595993C CN100595993C (en) | 2010-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710004636A Active CN100595993C (en) | 2007-01-12 | 2007-01-12 | Electronic device |
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| CN (1) | CN100595993C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988662A (en) * | 2018-07-18 | 2018-12-11 | 青岛海信日立空调系统有限公司 | A kind of substrate circuit and control method |
-
2007
- 2007-01-12 CN CN200710004636A patent/CN100595993C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988662A (en) * | 2018-07-18 | 2018-12-11 | 青岛海信日立空调系统有限公司 | A kind of substrate circuit and control method |
| CN108988662B (en) * | 2018-07-18 | 2020-06-19 | 青岛海信日立空调系统有限公司 | Substrate circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100595993C (en) | 2010-03-24 |
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