CN202205464U

CN202205464U - Recorder

Info

Publication number: CN202205464U
Application number: CN2011202662130U
Authority: CN
Inventors: 涂柏生; 王应军
Original assignee: SHENZHEN BOJUXING INDUSTRIAL DEVELOPMENT Co Ltd
Current assignee: Shenzhen Bojuxing Microelectronics Technology Co., Ltd.
Priority date: 2010-12-31
Filing date: 2010-12-31
Publication date: 2012-04-25
Anticipated expiration: 2020-12-31

Abstract

The utility model discloses a recorder, which comprises a power module and a recording module connected with the power module, wherein the power module comprises an internal power supply, the internal power supply comprises a USB (Universal Serial Bus) power supply and a boosted circuit connected with the USB power supply, the boosted circuit comprises an integrated chip MC34063, a positive pole and a first fly-wheel diode 1 N4148 connected with a pin 1 of the integrated chip MC34063. In the recorder, a common diode 1 N 4148 is used in the boosted circuit of the power module, a reverse breakdown voltage is higher, moreover, on the occasion that requirements are lower, namely, the current is less than 50mA, the voltage is less than 100V, and the oscillation frequency is less than 1 MHz, the function of Schottky diode can be completely achieved, and cost is lower.

Description

A kind of CD writers

The application is to be that Dec 31, application number in 2010 are 2010206959688, name is called dividing an application of " a kind of Switching Power Supply and CD writers " applying date.

Technical field

The utility model relates to a kind of CD writers, relates in particular to a kind of CD writers that can reduce cost.

Background technology

Switching Power Supply basic topology commonly used has 14 kinds approximately: buck switching-type regulator topology, boost switch adjuster topology, reversed polarity switch adjuster topology, push-pull topology, forward converter topology, double-end normal shock converter topology, interlock that forward converter is topological, half-bridge converter is topological, full-bridge converter is topological, anti exciting converter, current-mode topological sum current feed are topological, SCR shakes humorous topology, CUK converter topology.Every kind of topology all has characteristics and the applicable situation of himself.

The fly-wheel diode of device for power switching, transformer secondary output boost with the 600V diode etc. with the high speed diode of 600V～1.2kV and PFC in the high-frequency rectification diode more than the 100V, RCD buffer circuits in Switching Power Supply (SMPS) and PFC (PFC) circuit, have only high diode such as the switching frequency that uses schottky diode.

The schottky diode that uses in the Switching Power Supply have switching frequency high with advantages such as forward voltage drop is low, but its breakdown reverse voltage is lower, scarcely is higher than 60V, the highest only about 100V, and cost is high than general-purpose diode, has consequently limited its range of application.

The utility model content

The technical matters that the utility model will solve is that the schottky diode breakdown reverse voltage in the power module of CD writers is lower, and the defective that cost is higher provides a kind of CD writers that use other diodes to substitute schottky diode.

The utility model solves the technical scheme that its technical matters adopted:

A kind of Switching Power Supply is provided; Comprise power conversion integrated circuit, the direct supply that is connected with said power conversion integrated circuit; Also comprise the freewheeling circuit that is connected with said power conversion integrated circuit, first energy-storage units that is connected with said freewheeling circuit and second energy-storage units that is connected respectively with said freewheeling circuit and said power conversion integrated circuit; Said power conversion integrated circuit is the integrated chip of MC34063; Said freewheeling circuit comprises diode in series 1N4148 and resistance R 3; The positive pole of diode 1N4148 is connected with the pin 1 of integrated chip MC34063, and negative pole is connected with an end of resistance R 3, and the other end of said resistance R 3 is connected with the pin 5 of integrated chip MC34063.

In the described Switching Power Supply of the utility model, said first energy-storage units is a capacitor C 12, and load R5 is parallelly connected with said capacitor C 12, is connected with ground with the negative pole of diode 1N4148 respectively after its parallel connection; The negative pole of diode 1N4148 is a voltage output end.

In the described Switching Power Supply of the utility model; Said second energy-storage units is to be connected the pin 1 of integrated chip MC34063 and the inductance L 11 between the pin 7; Be connected with current-limiting resistance R1 between the pin 7 of integrated chip MC34063 and the pin 8; Connect sample resistance R2 between the pin 6 of integrated chip MC34063 and the pin 7, connect divider resistance R4 between the pin 5 of integrated chip MC34063 and the ground.

In the described Switching Power Supply of the utility model, also comprise and regulate integrated chip MC34063 pin 3 frequency of operation, that be connected integrated chip MC34063 and the capacitor C 11 between the ground.

In the described Switching Power Supply of the utility model, pin 2 and pin 4 ground connection of integrated chip MC34063.

The utility model also provides a kind of CD writers; Comprise power module and connected burning module; Said power module comprises internal electric source; Said internal electric source comprises USB power supply and connected booster circuit, and said booster circuit comprises integrated chip MC34063, the anodal first fly-wheel diode 1N4148 that is connected with the pin 1 of said integrated chip MC34063.

In the described CD writers of the utility model, said booster circuit also comprises first adjustable resistance that is connected with the pin 5 of the negative pole of the said first fly-wheel diode 1N4148 and said integrated chip MC34063.

In the described CD writers of the utility model; Said power module also comprises external power source, first reduction voltage circuit that is connected with said external power source and second reduction voltage circuit, single-pole double-throw switch (SPDT); The king pile of said single-pole double-throw switch (SPDT) is connected with the booster circuit of said internal electric source, and two son stakes of said single-pole double-throw switch (SPDT) are connected with said USB power supply with said second reduction voltage circuit respectively.

In the described CD writers of the utility model; Said external power source comprises the high-voltage DC power supply and second fly-wheel diode; The positive pole of wherein said second fly-wheel diode is connected with said high-voltage DC power supply, and the negative pole of said second fly-wheel diode is connected with said first reduction voltage circuit; Said first reduction voltage circuit connects and comprises that first linear voltage regulator that is connected with the negative pole of said second fly-wheel diode, said second reduction voltage circuit comprise a son second linear voltage regulator that is connected with said single-pole double-throw switch (SPDT).

In the described CD writers of the utility model, said first reduction voltage circuit also comprises second adjustable resistance that is connected with said first linear voltage regulator.

Application the utlity model has following beneficial effect: in the power module of CD writers, use common diode 1N4148; Its breakdown reverse voltage is higher; And requiring under the lower occasion; Be that electric current is no more than 50 milliamperes, voltage and is no more than 100V, when oscillation frequency is no more than 1 megahertz, can realize the function of schottky diode fully, but its cost is lower again.

Description of drawings

To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:

Fig. 1 is the circuit diagram of the utility model preferred embodiment Switching Power Supply;

Fig. 2 is the internal circuit diagram of integrated chip MC34063 in the utility model preferred embodiment Switching Power Supply;

Fig. 3 is the output voltage simulation waveform when exporting the load that connects 500 Europe resistance in the utility model preferred embodiment Switching Power Supply;

Fig. 4 is the circuit diagram of booster circuit in the utility model preferred embodiment OTP CD writers;

Fig. 5 is the circuit diagram of the power unit of the utility model preferred embodiment OTP CD writers.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Utilize Switching Power Supply to realize that DC voltage with 5V boosts in the preferred embodiment of the utility model and be the voltage about 12V; As shown in Figure 1; Comprise the power conversion integrated circuit; This power conversion integrated circuit can directly use the integrated chip of model as MC34063, and is as shown in Figure 2, and the pin 1 (csw) of integrated chip MC34063 is the collector terminal of switch transistor T 1; Pin 2 (esw) is switch transistor T 1 an emitter exit; Pin 3 (ct) is the terminals of timing capacitor ct, and control capacittance ct can make the frequency of operation of MC34063 in the 100-100kHz scope, change; Pin 4 (comm) is power supply ground; Pin 5 (fb) is the voltage comparator inverting input, also is simultaneously output voltage sampling end; Should external two precision during use be not less than 1% precision resistance; Pin 6 (vcc) is a power end; Pin 7 (ipk) is load peak electric current (Ipk) sampling end; When voltage surpasses 300mV between the

6 and 7, chip will start inner overcurrent protection function; Pin 8 (cdr) is the collector terminal of driving tube T2.Switching Power Supply comprises that also with the power conversion integrated circuit be the direct supply that pin 6 power ends of MC34063 are connected, and adopts the direct supply V1 of 5V in the utility model preferred embodiment; Also comprise the freewheeling circuit that is connected with the power conversion integrated circuit; Freewheeling circuit comprises that diode D model is the resistance R 3 of 1N4148 and series connection with it; Be connected between the pin 1 and pin 5 of integrated chip MC34063 after its series connection, wherein the positive pole of diode D is connected with the pin 1 of integrated chip MC34063, and the negative pole of diode D is connected with resistance R 3; The negative pole of diode D is voltage output end, and the other end of resistance R 3 is connected with the pin 5 of integrated chip MC34063.In the preferred embodiment of the present invention, the resistance of resistance R 3 is 57 kilo-ohms, and Switching Power Supply also comprises first energy-storage units that is connected with freewheeling circuit; Be capacitor C 12, its two ends are connected with ground with the negative pole of diode D, capacitor C 12 two ends shunt load electric capacity R5; The capacitance of capacitor C 12 is 100 microfarads, and the resistance of R5 is 500 Europe, and is as shown in Figure 3; Simulation waveform for output voltage; Output voltage is 12.75V, and the voltage rise time is 6.002 milliseconds, and this simulation waveform has explained that substituting schottky diode with general-purpose diode 1N4148 also can make the circuit steady operation.Second energy-storage units is to be connected the pin 1 of integrated chip MC34063 and the inductance L 11 between the pin 7, and 220 microhenrys of inductance L 11 are connected with current-limiting resistance R1 between the pin 7 of integrated chip MC34063 and the pin 8, and the resistance of R1 is 330 Europe; Connect capacitor C 11 between the pin 3 of integrated chip MC34063 and the ground, be used to regulate integrated chip MC34063 frequency of operation, the value of capacitor C 11 is 220 pico farads; Connect sample resistance R2 between the pin 6 of integrated chip MC34063 and the pin 7, its resistance is 1 Europe, pin 2 and pin 4 ground connection of integrated chip MC34063; Connect divider resistance R4 between the pin 5 of integrated chip MC34063 and the ground, resistance is 6.2K.

In the utility model preferred embodiment Switching Power Supply, when 1 conducting of switch transistor T in the chip, the direct supply V1 of 5V is through sample resistance Rsc, inductance L 11, and inductance L 11 begins stored energys at this moment, and to load R5 energy is provided by C12.When T1 broke off, power supply and inductance provided energy for simultaneously load R5 and capacitor C 12.Inductance L 11 is during releasing energy, because the electromotive force polarity at its two ends is identical with electric power polarity, be equivalent to two power supply series connection, thereby the voltage that obtains on the load R5 is higher than the voltage of power supply V1.The frequency of switch transistor T 1 conducting and shutoff is called the frequency of operation of chip.As long as the time constant of the relative load R5 of this frequency is enough high, just can obtain continuous DC voltage on the load R5, be 12V probably in the present embodiment.

The utility model preferred embodiment also provides and has utilized Switching Power Supply to boost to the USB power supply to obtain the OTP CD writers (OTP:Opposite Track Path backlight path) than High Level DC Voltage, and its burning low pressure that needs is 5V, and the burning high pressure is 13V,

The utility model preferred embodiment OTP CD writers comprise power module and connected burning module; As shown in Figure 5; Power module comprises internal electric source; Internal electric source comprises USB power supply 101 and connected booster circuit 102 again, generally can be connected with computer USB interface during the work of OTP CD writers, just the USB power supply that connects is regarded as its internal electric source here.Sustained diode 2 models that as shown in Figure 4, booster circuit 102 comprises integrated chip MC34063, be connected with integrated chip MC34063 are 1N4148, utilize booster circuit 102 that the USB power supply of 5V is boosted to 13V, for the OTP CD writers provide working voltage.Need not external other power supplys like this, just can let OTP CD writers operate as normal.

As shown in Figure 4, in the booster circuit 102, the

2 and 4 of integrated chip MC34063 is ground connection all; Pin 6 connects USB power supply 101; Connecting inductance between pin 5 and the pin 7 is 220 microhenrys, and wherein the positive pole of diode D2 is connected with the pin 1 of integrated chip MC34063, is in series with resistance R 46, R57 between the pin 5 of the negative pole of diode D2 and integrated chip MC34063; The resistance of resistance R 46 is 47 kilo-ohms, and the resistance of resistance R 57 is 10 kilo-ohms.As shown in Figure 4, be connected with current-limiting resistance R45 between the pin 7 of integrated chip MC34063 and the pin 8, resistance is 330 Europe, and a current-limiting resistance R44 is also arranged between pin 6 and the pin 7, resistance is 1 Europe.The electric capacity 16 that also comprises the adjusting working frequency of chip that is connected with pin 3 in the booster circuit 102 is 220 pico farads.Comprise also in the booster circuit 102 that with the negative pole of diode D2 be the storage capacitor that voltage output end is connected; Be formed in parallel by polar capacitor C9 and capacitor C 20, C9 is 10 microfarads, and C20 is 0.1 microfarad; Also being connected with storage capacitor C15 between the pin 6 of integrated chip MC34063 and the ground, is 0.1 microfarad.

In the utility model preferred embodiment OTP CD writers, further, also be connected with the first semifixed resistor R50 between the negative pole of diode D2 and the pin 5, resistance is 100 kilo-ohms, is used for the voltage of the voltage output end of the negative pole of diode D2 is finely tuned.

In the utility model preferred embodiment OTP CD writers; As shown in Figure 5; Power module also comprises external power source 201, first reduction voltage circuit 202 that is connected with external power source and second reduction voltage circuit 203; External power source is the DC voltage of 18V; First reduction voltage circuit 202 is used for external power source 18V is reduced to about the working voltage 13V of OTP CD writers, will reduce to about 5V through the voltage of first reduction voltage circuit 202 through second reduction voltage circuit 203, thereby through external power source the working voltage of OTP CD writers is provided.

Power module also comprises single-pole double-throw switch (SPDT) S2, and the king pile 2 of single-pole double-throw switch (SPDT) S2 is connected with the booster circuit 102 of internal electric source, and two of single-pole double-throw switch (SPDT) S2 stakes 1 are connected with USB power supply 101 with second reduction voltage circuit 203 respectively with 3.The selection that can realize external power source and internal electric source through single-pole double-throw switch (SPDT) S2 is switched, and when a power supply breaks down therein, can not influence the operate as normal of OTP CD writers.When single-pole double-throw switch (SPDT) S2 connects USB power supply 101; Promptly select for use internal electric source that the WV of CD writers burning module is provided through USB; When single-pole double-throw switch (SPDT) S2 connected second reduction voltage circuit 203, promptly the external power source 201 through 18V came for the burning module of CD writers WV to be provided.

Further; As shown in Figure 5; External power source 201 comprises that also being used to protect second sustained diode, 1 model of external power source is 1N4007, and wherein the positive pole of second sustained diode 1 is connected with high-voltage DC power supply, and the negative pole of second sustained diode 1 is connected with first reduction voltage circuit 202; Can also second sustained diode 1 and first reduction voltage circuit 202 between connect one be used to control external dc power logical and disconnected single-pole double-throw switch (SPDT) S1.Adopting the first linear voltage regulator U2 model at first reduction voltage circuit 202 is LM317BT; Its pin 2 is a voltage output end; Output voltage is about 13V; The negative pole of second sustained diode 1 is connected with the pin 3 (input end) of the first linear voltage regulator LM317BT, the

3 and 2 of the first linear voltage regulator LM317BT, and also be connected with divider resistance between

1 and 2; Between

3 and 2, also be connected with the storage capacitor of parallelly connected ground connection; Comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad, between this storage capacitor and the first linear voltage regulator LM317BT pin 1, also be connected with the second adjustable resistance R32, regulate the output voltage values that this resistance is the fine-tuning first reduction voltage circuit pin 2; Comprise that at second reduction voltage circuit second linear voltage regulator U3 model also is LM317BT, its pin 2 is connected with the son stake 3 of single-pole double-throw switch (SPDT) S2.Also be connected with the storage capacitor of parallelly connected ground connection between the pin 2 of the first linear voltage regulator U2 and the pin 3 of the second linear voltage regulator U3, comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad.As shown in Figure 5, also be connected with parallelly connected storage capacitor between the king pile of single-pole double-throw switch (SPDT) S2 and the ground, comprise a polar capacitor 10 microfarads and common electric capacity 0.1 microfarad.

The utility model Switching Power Supply and CD writers have all adopted common diode 1N4148 to substitute schottky diode; And requiring under the lower occasion; Be electric current be no more than 50 milliamperes, voltage be no more than 100V, when oscillation frequency is no more than 1 megahertz; Can realize the function of schottky diode equally, and improve breakdown reverse voltage, can reduce cost simultaneously.Adopt booster circuit to realize boosting of inner USB power supply in addition in the CD writers; Select external power source and internal electric source with single-pole double-throw switch (SPDT) simultaneously; The user can select used power supply as required; When a power supply breaks down therein, can substitute, guarantee the operate as normal of CD writers with another power supply.

Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model accompanying claims according to above-mentioned explanation.

Claims

1. CD writers; Comprise power module and connected burning module; It is characterized in that; Said power module comprises internal electric source, and said internal electric source comprises USB power supply and connected booster circuit, and said booster circuit comprises integrated chip MC34063, the anodal first fly-wheel diode 1N4148 that is connected with the pin 1 of said integrated chip MC34063.

2. CD writers according to claim 1 is characterized in that, said booster circuit also comprises first adjustable resistance that is connected with the pin 5 of the negative pole of the said first fly-wheel diode 1N4148 and said integrated chip MC34063.

3. CD writers according to claim 2; It is characterized in that; Said power module also comprises external power source, first reduction voltage circuit that is connected with said external power source and second reduction voltage circuit, single-pole double-throw switch (SPDT); The king pile of said single-pole double-throw switch (SPDT) is connected with the booster circuit of said internal electric source, and two son stakes of said single-pole double-throw switch (SPDT) are connected with said USB power supply with said second reduction voltage circuit respectively.

4. CD writers according to claim 3; It is characterized in that; Said external power source comprises the high-voltage DC power supply and second fly-wheel diode; The positive pole of wherein said second fly-wheel diode is connected with said high-voltage DC power supply, and the negative pole of said second fly-wheel diode is connected with said first reduction voltage circuit; Said first reduction voltage circuit connects and comprises that first linear voltage regulator that is connected with the negative pole of said second fly-wheel diode, said second reduction voltage circuit comprise a son second linear voltage regulator that is connected with said single-pole double-throw switch (SPDT).

5. CD writers according to claim 4 is characterized in that, said first reduction voltage circuit also comprises second adjustable resistance that is connected with said first linear voltage regulator.