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Capacitor voltage reducing circuit with short-circuit protection

A short-circuit protection circuit and short-circuit protection technology are applied in electrical components, output power conversion devices, and AC power input is converted into DC power output, etc., and can solve problems such as burning sampling circuits.

Inactive Publication Date: 2013-03-27
汤征宁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The capacitive step-down circuit of the AC power supply is equipped with a surge absorbing circuit due to the surge, and the surge absorbing circuit has a sampling circuit. When the filter capacitor in the capacitive step-down circuit is not fully discharged and the output circuit is short-circuited, the discharge current will Through the sampling circuit, the extremely large discharge current will burn the sampling circuit and the surge absorbing circuit

Method used

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  • Capacitor voltage reducing circuit with short-circuit protection
  • Capacitor voltage reducing circuit with short-circuit protection
  • Capacitor voltage reducing circuit with short-circuit protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] to combine figure 2 , as described below.

[0021] The rectifier circuit (1) is composed of diodes (D1) (D2) (D3) and (D4) connected to form a bridge rectifier, the output is connected to the filter capacitor (C1), and one end of the input AC power supply is connected to the diode (D1) through the step-down capacitor C The cathode and the anode of the diode (D2), the other end of the AC power supply is connected to the cathode of the diode (D3) and the anode of the diode (D4), the cathode of the diode (D2) and the cathode of the diode (D4) are connected to the anode of the filter capacitor (C1), and the anode of the diode (D1) and The anode of the diode (D3) is connected to the cathode of the filter capacitor (C1). The surge absorbing circuit (2) is composed of three tubes (BG1) (BG2) and resistance (R1) (R2) connected to form a Darlington circuit. The load (4) is an LED lamp, the positive electrode of the filter capacitor (C1) is connected to the emitter of the trio...

Embodiment 2

[0024] to combine image 3 , as described below.

[0025] image 3 The current-limiting resistor (R) is canceled and its two ends are short-circuited. When the internal resistance of the power circuit is large enough, this resistance can be equivalent to a current limiting resistor, and the resistance value of the current limiting resistor (R) can be 0, which means it can be short-circuited.

Embodiment 3

[0027] to combine Figure 4 , as described below.

[0028] Figure 4 After the emitter of the triode (BG1) is connected to one end of the resistor (R1), the surge limiting resistor (R5) is connected in series, and then the positive electrode of the filter capacitor (C1) and one end of the LED lamp are connected. When the discharge capacity of the filter capacitor (C1) is large, the discharge current is very large, such as the capacity of the triode (BG1) is not enough, in the case of not affecting the surge absorption function of the capacitor step-down, a surge limiting resistor with an appropriate resistance can be connected in series (R5) to protect the transistor (BG1).

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PUM

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Abstract

The invention relates to a capacitor voltage reducing circuit with short-circuit protection. One end of an alternating-current power supply is connected with one input end of a rectifying circuit (1) via a voltage-reducing capacitor C, the other end of the alternating-current power supply is connected with the other input end of the rectifying circuit (1), one output end of the rectifying circuit (1) is connected with one end of a surge absorbing circuit (2) and one end of a load (4) via a current-limiting resistor (R), the other output end of the rectifying circuit (1) is connected with the other end of the surge absorbing circuit (2) and one end of a sampling short-circuit protection circuit (3), the other end of the sampling short-circuit protection circuit (3) is connected with the other end of the load (4), and an output end of the sampling short-circuit protection circuit (3) is connected with a control end of the surge absorbing circuit (2). By the aid of the capacitor voltage reducing circuit with the short-circuit protection, the capacitor voltage reducing circuit is protected from being burnt and burnt up by output short circuit.

Description

technical field [0001] The invention relates to the technical field of capacitor step-down circuits, in particular to a capacitor step-down circuit with short-circuit protection. Background technique [0002] The capacitive step-down circuit of the AC power supply is equipped with a surge absorbing circuit due to the surge, and the surge absorbing circuit has a sampling circuit. When the filter capacitor in the capacitive step-down circuit is not fully discharged and the output circuit is short-circuited, the discharge current will Through the sampling circuit, the extremely large discharge current will burn the sampling circuit and the surge absorbing circuit. The output of the LED drive power supply with an external capacitor step-down circuit is very easy to short-circuit. In order to avoid damage accidents caused by this, a capacitor step-down circuit with short-circuit protection is extremely needed to prevent such accidents from happening. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): H02M7/162H02M1/32
Inventor 汤乃申汤征宁
Owner 汤征宁
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