Published:2011/6/15 2:13:00 Author:Borg | Keyword: adjustable power supply
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Published:2011/6/15 23:33:00 Author:Borg | Keyword: low-voltage, high-efficiency, stable-voltage
The weakness of the ordinary serial stable power supply is that the drive working voltage of the adjuster is higher that the output voltage, which leads to the large pole voltage difference of c and e, so part of the power is consumed and the efficiency is reduced. For example, if the output current of the 12V stable power supply of a black-white TV set is about 1A, the voltage drop of the adjusting pipe is 7.5V, the power consumption of the adjuster is 7.5W. It is not only low-efficient, but also becomes a heat source which needs a large-size heat emitter to cool the adjusting pipe.
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Published:2011/6/15 23:58:00 Author:Borg | Keyword: stable power supply, short circuit protection
1. The circuit is simple, the stable voltage is precise, and the output voltage remains the same after being imposed with a regulated load.2. It has functions of overload and short circuit protection and warning. When it is over-loaded, the voltage drop on resistor R8 is rising, when the voltage drops to 0.6V, the controllable silicon is conducting, which makes the basic LEV of Q1 drops to 1V or so, so the pipe Q1 and adjusting pipes of Q2 and Q3 are all blocked, and the adjusting pipe is protected from being burnt. After Q2 and Q3 are blocked, the output voltage becomes 0V, the electric switch Q4 is blocked, Q5 is conducting, so the multi-resonance oscillator composed of Q6 and Q7 is starting to oscillating(dozens of Hz ).
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Published:2011/6/16 21:28:00 Author:qqtang | Keyword: dual-channel, stable power supply
The dual-channel output switch stable power supply circuit is shown as follows.
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Published:2011/6/16 22:00:00 Author:qqtang | Keyword: power steady circuit
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Published:2011/6/16 22:16:00 Author:qqtang | Keyword: power supply
The 5V and 5a switch stable power supply circuit is shown in the following circuit.
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Published:2011/6/19 20:02:00 Author:qqtang | Keyword: power supply
The switch power supply circuit is shown in the figure.
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Published:2011/6/16 22:23:00 Author:qqtang | Keyword: answering racer
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Published:2011/6/16 22:26:00 Author:qqtang | Keyword: inverting switch, power supply
The inverting switch power supply circuit is shown in the figure.
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Published:2011/6/16 22:31:00 Author:qqtang | Keyword: power supply, single chip, switch stabilizer
The switch power supply circuit consisting of the single chip switch stabilizer dn-25 is shown in the figure.
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Published:2011/6/16 22:28:00 Author:qqtang | Keyword: walkie talkie
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Published:2011/6/16 22:29:00 Author:qqtang | Keyword: air-conditioner, remote control
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Published:2011/6/16 22:34:00 Author:qqtang | Keyword: application circuit, power supply
The application circuit of the stable power supply transistor switch is shown in the figure.
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Published:2011/6/16 22:36:00 Author:qqtang | Keyword: cell phone charger
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Published:2011/6/14 11:33:00 Author:Borg | Keyword: linear stabilizer circuit, output voltage
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Published:2011/6/14 20:07:00 Author:Borg | Keyword: linear stable power supply, output
(a)uncontrollable (b)controllable (View)
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Published:2011/6/14 20:27:00 Author:Borg | Keyword: external, linear stabilizer
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Published:2011/6/14 20:30:00 Author:Borg | Keyword: external, linear stabilizer
(a)band over-current protection (b)non-band over-current protection (View)
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Published:2011/6/15 7:18:00 Author:Borg | Keyword: step-down, power supply
In the figure is the +5v stable output step-down switching power supply consisting of MAX639. MAX639 is an efficient step-down DC/AC converter. The input voltage ranges from 5.5V to 11.5V, the output voltage is +5v or adjustable, the output current is 100mA, the converting efficiency is over 90%, and it has the functions of low-voltage battery detection and ON/OFF mode control. (View)
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Published:2011/6/14 20:38:00 Author:Borg | Keyword: working polarity, external capacitors
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