Deliang DE1102 digital tuning radio is a superior model in the current domestic radio market. It is also a small radio radio product in the world. Combining with classic SonySw7600g, it is a very high cost performance. However, such a product still has some places that are not as good as the people. In response to these issues, recently, the author has made a certain degree of mocking machine for DE1102, and has changed some original design, giving the majority of radio enthusiasts as a reference.
Mockup for power saving
The practicality of the radio and the battery consumption are very large, especially for small radios and pocket radios for easy-to-carry. Because the radio belongs to the electrical appliance used for a long time, the time of listening to broadcast is often in 1 to 3 hours, sometimes longer. If the radio consumption is huge, then the 6th small battery will be quite tasty. As the boot time is extended, the battery-terminal voltage drops quickly, to a certain extent, the radio will automatically turn off and stop working. According to the characteristics of the battery, the battery itself has a considerable energy reserve, but is merely because the load current is largely caused by "shutdown", which makes the effective capacity decreased.
In addition, for the user, I know that the radio consumption is large, there is a worrying psychology, I don't dare to listen to the broadcast for a long time, which makes the practical value of the small radio reduce a lot. Although the modern nickel hydride battery capacity is not small, it is only more than ten hours to charge once, or it is still not possible, and often charging is more troublesome. Since the radio power consumption is a dynamic current, the current has a short period of time with the volume, and the small volume and mute are longer. Therefore, the radio consumption is the most closeness This current is continuously consumed, and the dynamic current is superimposed on it, which reduces the static current to effectively reduce the battery consumption.
Depending on the design of Japan radio and consuming machine, they have lacked the power consumption of the battery, which increases many reactive power consumption when designing circuitry, for example, the above SONY radio, the power consumption of the AM band is close to 80mA. Such problems are also reflected in domestic high-grade digitally tuned radios. Deliang's DE1102 radio, the measured quiescent current is: FM55.6mA, MW62.1MA, SW55.1MA.
Analyze the use of useless power consumption of DE1102, mainly with the following aspects. First, the tuning instruction function of the machine is not designed to the LCD, and 4 LEDs are unreasonable. Originally, the tuning indication of Multi-level tuning is very convenient, and the electric power is low, but it seems that the original design does not take into account this indication, and in the future, it will increase this function, so it will not be solved with 4 LEDs: But 4 only The current consumption of the LED is 4.8mA.
Second, the MW high extension of the MW high level of the power switch is connected to a resistor R78 (1K) between the C highlights of the power switch, which will be 3mA, and the author thinks that this design is fallacy. Its role is when the MW band is closed, the power supply passes the EC junction, R84, R78 to the ground, so that this can be converted in a smort-consuming manner.
Third, the design has a lot of functions, the effect is not good, such as the SSB unilateral belt reception and low-input circuits, will consume some current.
Its fourth, the most important use of useless power consumption, on the power switch circuit of the machine, as shown in the figure below) The end voltage of the battery is directly added to the E-pole of the switch tube Q36, all the way through the high-efficiency triple voltage regulator U5 ( ME62) Stable 3V voltage, powered by D20 (power-consuming electrode micro), and additionally applied to the E-pole of the switch tube Q34.
The B poles of Q34 and Q36 are controlled by the triode Q35. When the Q35 accepts the power-on high level from the digital control circuit, the battery terminal voltage (3.6V) has passed the Q36EB knot, RL67 (4700) and Q35CE On the ground, generate a current of 6.383mA, which causes Q36 to power the radio power amplifier circuit; the + 3V voltage output by the U5 is overlapping the Q34EB knot, RL64 (4700) and Q35CE, resulting in 5.LO6MA current, giving radios High and medium frequency and other circuits power supply and implementation. But the consumption of the two currents and 11.489ma belongs to useless power consumption.
In addition, the charging function of the machine is a constant current timing charging method. It is better to charge the battery with a dedicated charger, so I changed the original charge circuit.
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