CN104617758A - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
- Publication number
- CN104617758A CN104617758A CN201510060298.XA CN201510060298A CN104617758A CN 104617758 A CN104617758 A CN 104617758A CN 201510060298 A CN201510060298 A CN 201510060298A CN 104617758 A CN104617758 A CN 104617758A
- Authority
- CN
- China
- Prior art keywords
- transistor
- diode
- power supply
- triode
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a power supply circuit. The power supply circuit comprises a power supply input end, wherein the power supply input end is connected with an electrostatic protection circuit and simultaneously connected with ends of the primary and secondary edges of a transformer, the other end of the primary edge of the transformer is simultaneously connected with the collector of the triode and the anode of a second diode, the other end of the secondary edge of the transformer is connected with the base electrode of a triode through a second resistor, the emitting electrode of the triode is grounded, and the cathode of the second diode is connected with a grounding capacitor; the electrostatic protection circuit comprises a diode group, a first resistor and a transistor, the same phases of the diode group are in series connected, the grid electrode and the source electrode of the transistor are respectively grounded, the drain electrode of the transistor and the anode of the diode group are respectively connected with the power supply input end, and the base electrode of the transistor is connected to the cathode of the diode group and grounded through the first resistor. According to the power supply circuit, static electricity or surge can be effectively protected, and the circuit is simple in structure and appropriate for a small-scale appliance.
Description
Technical field
The present invention relates to a kind of power circuit.
Background technology
Power supply is the very important part of electrical equipment.Because the volume of compact electric apparatus is little, such as humidifier, egg steamer etc., it requires that circuit is simple, miniaturized.But existing circuit is all too complicated, is unsuitable for compact electric apparatus and uses.And electrical equipment is in use, the interference of electrostatic and surge can be run into, in existing power circuit, a little shortcoming that the protection of this respect is done.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of power circuit, and it can effectively protect electrostatic or surge, and circuit structure is simple, is applicable to compact electric apparatus and uses.
The present invention's adopted technical scheme that solves the problem is:
A kind of power circuit, comprise power input, described power input is connected with electrostatic discharge protection circuit and is connected with one end of secondary with transformer primary side simultaneously, the other end of described transformer primary side is connected on the collector electrode of triode and the positive pole of the second diode simultaneously, the other end of described transformer secondary is connected with the base stage of triode by the second resistance, the grounded emitter of described triode, the negative pole of the second described diode is connected with ground capacity, described electrostatic discharge protection circuit comprises the diode group with being in series, first resistance and transistor, the grid of described transistor and source grounding, the drain electrode of described transistor is all connected with the positive pole of diode group and is connected with power input, on the negative pole that the base stage of described transistor is connected to diode group and by the first grounding through resistance.
The negative pole i.e. power output end of this power circuit of the second diode.Circuit theory of the present invention is as follows: the conducting of power supply for triode after transformer transformation provides pressure reduction, and triode carries out amplification output to voltage, and namely whole power circuit can realize powering to the boosting of voltage.Second resistance plays metering function, protects triode; The current direction of one-way to whole circuit of the second diode limits, and protects power circuit; Electric capacity strobes, and it is the indispensable part of power circuit.Due to compact electric apparatus in use; often electrostatic can be run into; or in open and close power supply moment; surge can be produced; power input connects electrostatic discharge protection circuit; when power input has electrostatic interference or produces surge, electrostatic discharge protection circuit is released to electrostatic or surge immediately, protects circuit.The circuit structure of this electrostatic discharge protection circuit is simple, and the trigger voltage of transistor is determined by diode group, and its trigger voltage can determine to have Modulatory character by the number of diodes of connecting in diode group.When the voltage of power input increases, make the voltage difference at diode group two ends make the conducting of diode group, now on the first resistance by generation current, the voltage in transistor substrate is changed, thus makes its conducting, and then electrostatic is released.Because the trigger voltage of electrostatic discharge protection circuit is determined by diode group, so trigger voltage can be made in actual applications lower than the reverse breakdown voltage of diode, to improve its antistatic capacity.Utilize electrostatic discharge protection circuit, strengthen the ability of power circuit antistatic and surge, strengthen reliability and the fail safe of power supply.Adopt transformer to carry out transformation to input voltage, it also further can strengthen the Anti-surging ability of power circuit, cushions, the fail safe of intensifier circuit to surge voltage.The circuit structure of whole circuit is simple, practical, is applicable to miniaturized electrical equipment and uses.
As preferably, the former limit of described transformer and the ratio of secondary are 3:2.
As preferably, the resistance of the second described resistance is between 250 ohm to 400 ohm.
As preferably, described electric capacity is electrochemical capacitor.
To sum up, the invention has the beneficial effects as follows:
1, for the conducting of triode provides pressure reduction after the present invention utilizes transformer to carry out transformation to power supply, triode carries out amplification to voltage and exports as electrical equipment provides operating voltage, electrostatic discharge protection circuit is utilized to protect electrostatic or surge, the circuit structure of its whole circuit is simple, is suitable for compact electric apparatus and uses.
2, transformer of the present invention can not only provide the pressure reduction of conducting for triode, also can cushion surge voltage, the Anti-surging ability of forceful electric power source circuit, the fail safe of intensifier circuit.
3, the trigger voltage of electrostatic discharge protection circuit of the present invention determines to have Modulatory character by diode group, can adjust according to the designing requirement of concrete electrical equipment.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Mark and corresponding parts title: in, power input in accompanying drawing; Out, power output end; MOS, transistor; R1, the first resistance; R2, the second resistance; T, transformer; Q, triode; D1, diode group; D2, the second diode; C, electric capacity.
Embodiment
Below in conjunction with embodiment and accompanying drawing, 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.
Embodiment 1:
A kind of power circuit as shown in Figure 1, comprise power input in, described power input is connected with electrostatic discharge protection circuit and is connected with one end of secondary with the former limit of transformer T simultaneously, the other end on the described former limit of transformer T is connected on the collector electrode of triode Q and the positive pole of the second diode D2 simultaneously, the other end of described transformer secondary is connected with the base stage of triode Q by the second resistance R2, the grounded emitter of described triode Q, the negative pole of the second described diode D2 is connected with ground capacity C, described electrostatic discharge protection circuit comprises the diode group D1 with being in series, first resistance R1 and transistor MOS, the grid of described transistor and source grounding, the drain electrode of described transistor MOS is all connected with the positive pole of diode group D1 and is connected with power input, on the negative pole that the base stage of described transistor MOS is connected to diode group D1 and by the first resistance R1 ground connection.Transistor MOS in the present embodiment adopts NMOS.
The former limit of described transformer and the ratio of secondary are 3:2.
In order to effectively protect triode, and reduce the loss of circuit, the resistance of the second described resistance is between 250 ohm to 400 ohm.
In order to improve the reliability of power supply, described electric capacity is electrochemical capacitor.
One group of detailed embodiment is now disclosed, power supply for humidifier is example: electric capacity C adopts electrochemical capacitor, 40 μ F can be selected, diode can adopt IN5819, triode can adopt 8050, and the first resistance can adopt 300 ohm, and the second resistance can adopt 350 ohm, transistor adopts NMOS, and diode group can adopt 3 Diode series.
As mentioned above, the present invention can be realized preferably.
Claims (4)
1. power circuit, comprise power input, it is characterized in that: described power input is connected with electrostatic discharge protection circuit and is connected with one end of secondary with transformer primary side simultaneously, the other end of described transformer primary side is connected on the collector electrode of triode and the positive pole of the second diode simultaneously, the other end of described transformer secondary is connected with the base stage of triode by the second resistance, the grounded emitter of described triode, the negative pole of the second described diode is connected with ground capacity, described electrostatic discharge protection circuit comprises the diode group with being in series, first resistance and transistor, the grid of described transistor and source grounding, the drain electrode of described transistor is all connected with the positive pole of diode group and is connected with power input, on the negative pole that the base stage of described transistor is connected to diode group and by the first grounding through resistance.
2. power circuit according to claim 1, is characterized in that: the former limit of described transformer and the ratio of secondary are 3:2.
3. power circuit according to claim 1, is characterized in that: the resistance of the second described resistance is between 250 ohm to 400 ohm.
4. power circuit according to claim 1, is characterized in that: described electric capacity is electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510060298.XA CN104617758A (en) | 2015-02-05 | 2015-02-05 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510060298.XA CN104617758A (en) | 2015-02-05 | 2015-02-05 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104617758A true CN104617758A (en) | 2015-05-13 |
Family
ID=53152086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510060298.XA Pending CN104617758A (en) | 2015-02-05 | 2015-02-05 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104617758A (en) |
-
2015
- 2015-02-05 CN CN201510060298.XA patent/CN104617758A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 道客巴巴: "1.5v手电筒LED驱动电路", 《道客巴巴》 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150513 |
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| RJ01 | Rejection of invention patent application after publication |