power supply circuit

HA17385 switching power supply with constant power

Published:2011/7/10 6:06:00 Author:chopper | Keyword: switching power supply, constant power

Figure shows HA17385 switching power supply with constant power,its output voltage is 85V (380V for no-load),output power is 35W, input voltage is 10~16V, and the maximum output current is about 0.5A.This constant switching power supply can be used for sputtering discharge,welding discharge systems and ballast which can inhibit radiation intensity of high-pressure mercury lamp.Circuit adopts on/off work method,the output power can be adjusted by RP1.   (View)

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UCC3580 converter circuit

Published:2011/7/10 5:49:00 Author:chopper | Keyword: converter circuit

Figure 1 shows the UCC3580 converter, and it is the positive driving DC-DC converter whose input voltage is +18~+30 V, and output is 5V/8A. In the circuit, the control circuit adopts UCC3580 integrated controller,and the internal equivalent circuit is shown as Figure 2.In the UCC3580 there is the oscillator which can determine the switching frequency and dead time,error amplifier, pulse by pulse type over-current protection circuit,PWM control comparator,the circuit which can decide the work starting voltage and stopping voltage,and the PWM output which can drive the main switch and auxiliary switch and timing circuits and so on.   (View)

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LT1725 converter circuit

Published:2011/7/10 5:37:00 Author:chopper | Keyword: converter circuit

Figure shows the LT1725 converter,and this is the isolated DC-DC converter whose input voltage is +48V,and output is +5V/2A.As for the LT1725 integrated controller,it can obtain output voltage of high stability even if it is without negative feedback from the secondary side.And it has fewer external components,the circuit is relative simple.   (View)

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current limiting circuit

Published:2011/7/10 4:00:00 Author:chopper | Keyword: current, limiting circuit

current limiting circuitis shown as picture   (View)

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UC3843A converter circuit

Published:2011/7/10 5:32:00 Author:chopper | Keyword: converter circuit

Figure shows the UC3843A converter,and it is the 5V/2A isolated flyback-type converter. This is the equivalent circuit of UC3843A whose input voltage is +36 ~+72 V,and output is shown as the picture.   (View)

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BIC1422 DC-AC converter circuit

Published:2011/7/10 3:59:00 Author:chopper | Keyword: DC-AC, converter circuit

BIC1422 DC-AC converter circuit is shown as picture   (View)

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BQ2057 charger circuit uses the P-channel MOSFET design

Published:2011/7/10 18:52:00 Author:TaoXi | Keyword: charger, P-channel, MOSFET design

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Practical lithium ion battery charger circuit composed of the MAX846A

Published:2011/7/10 18:54:00 Author:TaoXi | Keyword: Practical, lithium ion battery, charger

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BQ2057 charger circuit uses the PNP transistor design

Published:2011/7/10 18:59:00 Author:TaoXi | Keyword: charger, PNP transistor

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Blocking communication device power supply circuit uses the TDA4600

Published:2011/7/10 19:24:00 Author:TaoXi | Keyword: Blocking, communication device, power supply

Figure:Blocking communication device power supply circuit uses the TDA4600   (View)

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Zero type rectifier voltage stabilization circuit

Published:2011/7/10 19:18:00 Author:TaoXi | Keyword: Zero type, rectifier, voltage stabilization

The circuit voltage regulator tube is connected with the capacitor and resistor components. The voltage regulator tube is connected with the AC power supply through the input capacitance in the conduction direction of it, and it limits the current in the blocking direction, so the rear capacitance recharges to stabilize the output voltage. This circuit has larger voltage pulse than the bridge type, and because the circuit is connected with the AC power supply directly, so the current consumption is small. Figure:Zero type rectifier voltage stabilization circuit   (View)

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Charging circuit composed of the MAXl679

Published:2011/7/10 19:31:00 Author:TaoXi | Keyword: Charging circuit

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Noise circuit diagram of processing feeble signal

Published:2011/6/16 23:59:00 Author:Sophia | Keyword: Noise circuit, Processing feeble signal

When designing the circuit of processing feeble AC signal, the key proplem of restricting performance is noise. The noise can be classified as three types: th ermal noise from signal source, the noise from the interior and exterior of electrical device. External noise has a transmission line noise, electrostatic noise coupling, electromagnetic coupling noise, radio noise and radiation, physical vibration, heat, light and other form of noise. Thermal noise is formed from the irregular movement of free electrons inside conductor. Thermal noise voltage Vn = 4KTRB, among which, K is Boltzmann constant (1.38x1O-23JK), T is thermodynamic temperature (K), R is the resistance value (Ω), B is the bandwidth product (HZ). From the above equation, thermal noise and the thermodynamic temperature, resistance, and bandwidth is proportional to the square root of the product. Thermodynamic temperature is calculated at T = 300. .   (View)

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Processing on Capacitive loading circuit diagram

Published:2011/6/16 5:27:00 Author:Sophia | Keyword: Capacitive loading, Processing

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Small-signal circuit diagram under experiment circumstance

Published:2011/6/16 23:46:00 Author:Sophia | Keyword: Small-signal circuit, Under experiment circumstance

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Input end protection circuit of dual power operational ampplifier

Published:2011/6/20 2:25:00 Author:Sophia | Keyword: Dual power operational ampplifier, Input end protection

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Beijing City Hunter off-road vehicle non-contact ignition system and charging system circuit diagram

Published:2011/6/30 11:35:00 Author:Sophia | Keyword: Beijing City Hunter off-road vehicle, non-contact ignition system, charging system

Non-contact ignition system (see Figure 1) Non-contact ignition system BJ2020SG SUV circuit wiring diagram is shown in Figure 1. In addition to the ignition system suits, the rest of the circuit is unchanged. Non-contact ignition system circuit is shown in Figure 1. Rotor with four poles (with the same number of cylinders) and the stator winding signal generator coil, when the distributor shaft rotates, Non-contact ignition system produces the ignition signal four times a week, the signal voltage input to the ignition module 7. The electronic circuit is used to control turn on and off of the final stage switch tube, when the magnetic-electric ignition signal generator signal is not sent; the ignition coil primary current can flow through the last stage switch tube. When the ignition signal arrives, the last stage switch tube is cut-off, and turn off the primary current, so that the secondary coil generate high voltage, spark plug ignites.   (View)

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The package and internal structure circuit diagram of integrated chip S-8054ALR

Published:2011/7/7 5:58:00 Author:Sophia | Keyword: package, internal structure, integrated chip S-8054ALR

In order to obtain reliable reset signal, dedicated reset IC chips should be adopted. For example, integrated chip S-8054ALR, the package and the internal structure are showed as figure a and b, there are voltage reference and comparator inside the chip to make a comparision between UDD and the reference voltage (S-8054ALR integrated chip of the 4.3 ~ 4.6V) to output signal.   (View)

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RC reset circuit diagram

Published:2011/7/7 6:19:00 Author:Sophia | Keyword: RC, reset circuit

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Part of Switching Power Supply Circuit

Published:2011/7/1 2:21:00 Author:Joyce | Keyword: Part , Switching Power Supply

As shown in the figure, the 12 V voltage is not stable, therefore, the output part of the switching power supply should be examined first. Check whether the secondary winding of the switch transformer and VD4 function properly and make sure that inductance L2 has no cold solder joint. Parameters of filter capacitance C22 and C23 are 1000 pF / 16 V.If one uses the capacitance meter to measure C23, one will find that it works properly (capacity declines slightly), but the capacity of C22 drops to less than 80 uF. The reason is that the main source of the machine is installed at the base of the monitor, which is small and has low heat dissipation, while C23 and C22 both are close to the 12 V rectifier diode (especially C22), so their capacity would decline after baking, to lower the loading ability of the voltage, which further leads to this fault.   (View)

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