TWI482430B - Switching power supply of pc, notebook, tablets and smart phone applicant by multiple specification capacitors to regulate flat impedance of power supply at listened frequency range - Google Patents

Description

Power supply impedance adjustment circuit and switching power supply for desktop computers, notebook computers, tablet computers and smart phones

The invention relates to a power supply impedance adjusting circuit for a desktop computer, a notebook computer, a tablet computer and a smart phone, which uses a plurality of different specifications of capacitors to adjust the power supply impedance in the audible frequency range, and the expansion device The internal amplifier circuit has a full-band average frequency response. When the device uses headphones and audio to listen to music, it can have high-fax and real-music listening effects.

Switching power supply for desktop computers, notebook computers, tablet computers and smart phones. The output filter capacitors use a single specification capacitor or a plurality of minority capacitors, as shown in Figure 1.

Because the filter capacitor is configured with a single capacitor or a few capacitors, the impedance of the power supply is not even across the audible range, causing desktops, notebooks, tablets, and smartphones to listen to music using headphones or connected audio equipment. At the time, the frequency response of the amplifier circuit output to the earphone or the sound system is within the audible range frequency, and some of the frequency bands have attenuation conditions that affect the performance of listening to music. As shown in Figure 2.

The main purpose of the present invention is to provide a power impedance adjustment circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone, mainly in the existing desktop, notebook, tablet, and smart phones. Behind the power supply, a variety of power supply impedance adjustment circuits of different capacitances are added to adjust the impedance of the power supply in the audible frequency range, and then to the desktop computer, notebook computer, tablet computer and smart phone.

A main technical means for achieving the foregoing objectives is to enable the aforementioned power impedance adjustment circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone to include a DC power supply circuit having a positive voltage and a negative voltage. The two ends of the voltage positive pole and the voltage negative pole respectively constitute a DC power input end and a DC power output end; one or a plurality of capacitors of different specifications, including a first end and a second end, the first end is coupled to The anode of the voltage is coupled to the negative pole of the voltage; a diode is connected in series with the positive pole of the voltage, the diode has an anode and a cathode, and the anode is connected to the input end of the DC power source, and the cathode is connected The DC power output.

Another main technical means for achieving the foregoing objectives is to enable the aforementioned power impedance adjustment circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone to include a DC power supply circuit having a positive voltage and a voltage. The negative pole, the two ends of the voltage positive pole and the voltage negative pole respectively constitute a DC power input end and a DC power output end; one or a plurality of capacitors of different specifications, including a first end and a second end, the first end is coupled To the positive pole of the voltage, the second end is coupled to the negative pole of the voltage; a first transistor having an emitter and a source connected in series with the positive electrode; a second transistor having an emitter connected to the positive electrode and a source connected to the base of the first transistor; a diode The anode is connected to the negative electrode of the voltage, and the cathode thereof is connected to the base of the second transistor, and is connected to the positive electrode of the voltage through a resistor.

Still another object of the present invention is to provide an exchange power supply for a desktop computer, a notebook computer, a tablet computer, and a smart phone, comprising the aforementioned power supply impedance adjustment circuit.

By using the present invention, when a desktop computer, a notebook computer, a tablet computer, and a smart phone use a switched power supply, the earphone and the audio are used to listen to music, and the power supply impedance adjusting circuit of the present invention adjusts the switching power supply. After the impedance, the amplifier circuit in the device can output the high, medium and low sounds in the audible range frequency, and improve the sound listening effect (as shown in Figure 3).

1. Note type, tablet computer and smart phone exchange type power supply DC power supply output, the positive pole of the device is connected to the capacitor positive pole and the negative voltage of the device of the invention, and the capacitor negative pole of the device of the invention is connected to the circuit device of the invention, and then the power supply is output. Notebook type, tablet computer and smart phone, because the circuit of the invention reduces the power supply impedance of the audible frequency range on average, so that when the amplifying circuit in the above device outputs the earphone and the sound, the sound can be averaged in the high, medium and low sounds in the audible range frequency. Improve music listening. As shown in Figure 4.

2. Desktop computer switched power supply DC power output 12V and 5V The head is connected in parallel with the switching power supply filter capacitor of 12V or 5V (according to the voltage used by the amplifying circuit), and the positive pole of the device and the negative pole of the voltage of the device are connected to the capacitor negative pole of the device of the invention, and after receiving the circuit device of the invention, The invention circuit reduces the power supply impedance of the audible frequency range on average, so that when the amplifying circuit in the above device outputs the earphone and the sound, the sound can be averaged in the high, medium and low sounds in the audible range frequency, and the music listening effect is improved. As shown in Figure 5.

3. Use the capacitance calculation method: Calculate the required maximum and minimum capacitance specifications according to the load impedance and the minimum audible frequency of 20 Hz and the highest audible frequency of 20,000 Hz. The calculation formula: db value=10*log (Wout/Win), Win is input power=Vin input voltage*Iin input current, Vin input voltage=Iin input current*(Rload load impedance+Xc capacitor impedance), Wout is output power=Vin output voltage*Iin input current, Vin output voltage = Iin input current * Rload load impedance, Xc capacitor impedance = 1/2 π fc. where Xc is the capacitance resistance value in ohms, f is the applied AC frequency C is the capacitance Farad F.

4. Use the same or close withstand voltage specification capacitor, starting from the cutoff capacitor specification value required for the lowest audible frequency, the first use capacitor specification, and the second and subsequent capacitor specifications by a fixed multiple of the previous one. Value, repeat the calculation of the required capacitance specifications, the amount of capacitance used in each specification is 1 quantity, and stops until the minimum capacitance specification. The capacitance specification is divided by the fixed multiple, and the power supply impedance is flat in the audible frequency range.

5. Deduct the specifications of the filter electrolytic capacitor that has been used in parallel with the switching power supply, and deduct the specifications of the electrolytic capacitor connected in parallel with the power supply in the audio playback electronic device.

6. The device of the present invention can be implemented by connecting a switching power supply and a filter capacitor in parallel.

7. The device of the present invention integrates a combination of a resistor, an inductor, a diode, and a transistor for external or internal built-in switching power supply.

Figure 1: Circuit block diagram of an existing switched power supply.

Figure 2: Schematic diagram of the impedance and frequency of the filter capacitor power supply of the existing switched power supply, and the sound signal and frequency of the output circuit of the connected equipment.

Figure 3 is a schematic diagram of the frequency impedance adjustment of the present invention and the output signal and frequency of the amplifying circuit of the connected device.

Figure 4: is a schematic diagram of the connection of the present invention to an exchange power supply for desktop computers, notebook computers, tablet computers, and smart phones.

FIG. 5 is a first preferred circuit diagram of the power impedance adjusting circuit for the desktop computer, the notebook computer, the tablet computer and the smart phone of the present invention.

Figure 6 is a second preferred embodiment circuit diagram of the power impedance adjusting circuit for the desktop computer, the notebook computer, the tablet computer and the smart phone of the present invention.

Figure 7 is a third preferred embodiment circuit diagram of the power impedance adjusting circuit for the desktop computer, the notebook computer, the tablet computer and the smart phone of the present invention.

Figure 8: This is the invention for desktop computers, notebook computers, tablets A fourth preferred embodiment circuit diagram of a power impedance adjustment circuit for a computer and a smart phone.

Figure 9 is a fifth preferred embodiment circuit diagram of the power impedance adjusting circuit for the desktop computer, the notebook computer, the tablet computer and the smart phone of the present invention.

Claims (4)

A power impedance adjustment circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone, comprising: a DC power supply circuit having a voltage positive electrode and a voltage negative electrode, wherein the voltage positive electrode and the negative voltage terminal are respectively Forming a DC power input terminal and a DC power output terminal; one or a plurality of capacitors of different specifications, including a first end and a second end, the first end is coupled to the positive pole of the voltage, and the second end is coupled to The voltage is negative; a diode is connected in series with the positive electrode, the diode has an anode and a cathode, and the anode is connected to the DC power input end, and the cathode is connected to the DC power output. A power impedance adjustment circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone, comprising: a DC power supply circuit having a voltage positive electrode and a voltage negative electrode, wherein the voltage positive electrode and the negative voltage terminal are respectively Forming a DC power input terminal and a DC power output terminal; one or a plurality of capacitors of different specifications, including a first end and a second end, the first end is coupled to the positive pole of the voltage, and the second end is coupled to a negative electrode; a first transistor having an emitter and a source connected in series with the positive electrode; a second transistor having an emitter connected to the positive electrode and a source connected to the base of the first transistor; a diode having an anode connected to the negative electrode, a cathode and a second electrode The base of the crystal is connected while being connected to the positive electrode through the resistor. The power source impedance adjusting circuit for a desktop computer, a notebook computer, a tablet computer, and a smart phone according to claim 2, wherein the transistor is a field effect transistor, and the diode is a Zener diode. An exchange power supply for a desktop computer, a notebook computer, a tablet computer, and a smart phone, comprising the power supply impedance adjustment circuit according to any one of claims 1 to 3.