CN210469112U

CN210469112U - Constant-current discharging tool of input filter capacitor for maintaining switching power supply

Info

Publication number: CN210469112U
Application number: CN201922014753.9U
Authority: CN
Inventors: 於红卫; 刘静
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-05-05
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a constant current discharging tool of an input filter capacitor for maintaining a switching power supply, which comprises a connecting terminal, a rectifying circuit and a constant current discharging circuit; the constant current discharge circuit comprises a diode D1, a resistor R4, a capacitor C1, a resistor R11, a voltage regulator tube D11, a capacitor C2, a light emitting diode D2, a resistor R5, a resistor R6, a MOS tube Q1, a resistor R14 and a resistor R15; the connecting terminal is electrically connected with the input end of the rectifying circuit, and the output end of the rectifying circuit is electrically connected with the constant current discharge circuit. The constant-current discharging tool can control the polarity of input voltage by using a rectifying circuit, so that the input voltage is not divided into positive and negative, and the tool can be used for discharging without dividing alternating current and direct current; the MOS constant current circuit is used in the capacitor discharge tool, compared with the original discharge tool, the volume of the tool is greatly reduced, and the service life of the capacitor is not influenced by constant current discharge.

Description

Constant-current discharging tool of input filter capacitor for maintaining switching power supply

Technical Field

The utility model relates to a constant current discharge tool, especially a switching power supply maintains with input filter capacitor's constant current discharge tool.

Background

With the development of scientific and technological progress and society, the use of a switching power supply is more and more popular, and the switching power supply is used for supplying power to mobile phone chargers, computer adapters, electric vehicle chargers and various household appliances. When the switch power supply is damaged for maintenance, the capacitor needs to be discharged firstly due to the input of the residual voltage of the filter capacitor (high voltage), otherwise, electric shock danger can be caused, and secondary damage of the switch power supply can be caused if the discharging operation is improper. The electric capacity that present maintenance trade generally adopted discharges the instrument and includes: (1) the electric discharge is carried out by a plug of an electric iron, and the defects are as follows: the distance of the plug is fixed, the plug is inconvenient to contact with a capacitor, no indication is given to discharge, whether the discharge is completely unknown or not is not convenient to carry; (2) the discharge with incandescent lamps has the following disadvantages: the discharge current is not constant, the service life of the capacitor is shortened, and the capacitor is inconvenient to carry; (3) the resistance grade of the multimeter is used for discharging, and the defects are that: if the gear is set wrongly, the universal meter is damaged and is inconvenient to carry; (4) the power resistor is used for discharging, and the defects are that: discharge no indication, whether discharge is completely unknown; (5) the screwdriver is used for directly short-circuiting two ends of the capacitor to discharge, and the defect is that: direct short circuits can shorten the life of the capacitor and present an electric shock hazard. Therefore, it is necessary to design a constant current discharging tool of the input filter capacitor for maintaining the switching power supply, which can not only realize visualization of discharging, but also realize constant discharging current and protect the service life of the capacitor.

Disclosure of Invention

Utility model aims to: the constant-current discharging tool of the input filter capacitor for maintaining the switching power supply can not only realize discharge visualization, but also realize constant discharge current and protect the service life of the capacitor.

The technical scheme is as follows: the utility model discloses a constant current discharging tool of input filter capacitor for maintaining switch power supply, which comprises a connecting terminal, a rectifying circuit and a constant current discharging circuit;

the constant current discharge circuit comprises a diode D1, a resistor R4, a capacitor C1, a resistor R11, a voltage regulator tube D11, a capacitor C2, a light emitting diode D2, a resistor R5, a resistor R6, a MOS tube Q1, a resistor R14 and a resistor R15;

the connecting terminal is electrically connected with the input end of the rectifying circuit, and the output end of the rectifying circuit is electrically connected with the positive end of the diode D1 and the positive end of the light-emitting diode D2 respectively; the negative electrode end of the diode D1 is electrically connected to one end of the resistor R4 and one end of the capacitor C1, respectively; the negative electrode end of the light-emitting diode D2 is electrically connected with one end of the resistor R5 and one end of the resistor R6 respectively; the other end of the resistor R4 and the other end of the capacitor C1 are both electrically connected with one end of a resistor R11; the other end of the resistor R11 is respectively and electrically connected with the negative electrode end of a voltage regulator tube D11, one end of a capacitor C2 and the G pole end of an MOS tube Q1; the other end of the resistor R5 and the other end of the resistor R6 are both electrically connected with the D pole of the MOS transistor Q1; the S pole end of the MOS transistor Q1 is electrically connected with one end of the resistor R14 and one end of the resistor R15 respectively; the positive terminal of the voltage regulator tube D11, the other terminal of the capacitor C2, the other terminal of the resistor R14 and the other terminal of the resistor R15 are all grounded.

Further, the LED display device also comprises an LED indicating circuit;

the LED indicating circuit comprises a resistor R12, a resistor R13, a resistor R1, a resistor R2, a resistor R3, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a light emitting diode D7, a light emitting diode D8, a light emitting diode D9, a light emitting diode D10, a voltage regulator tube D12, a voltage regulator tube D13, a voltage regulator tube D14 and a voltage regulator tube D15;

one end of the resistor R1 is electrically connected with the positive end of the diode D1, and the other end of the resistor R1 is electrically connected with one end of the resistor R2; the other end of the resistor R2 is electrically connected with one end of the resistor R3; the other end of the resistor R3 is electrically connected to one end of the resistor R12, one end of the resistor R13, one end of the resistor R7, one end of the resistor R8, one end of the resistor R9, and one end of the resistor R10, respectively; the other end of the resistor R7 is electrically connected with the positive end of the light-emitting diode D7; the other end of the resistor R8 is electrically connected with the positive end of the light-emitting diode D8; the other end of the resistor R9 is electrically connected with the positive end of the light-emitting diode D9; the other end of the resistor R10 is electrically connected with the positive end of the light-emitting diode D10; the negative end of the light-emitting diode D7 is electrically connected with the positive end of the voltage-regulator tube D12; the negative end of the light-emitting diode D8 is electrically connected with the positive end of the voltage-regulator tube D13; the negative end of the light-emitting diode D9 is electrically connected with the positive end of the voltage-regulator tube D14; the negative end of the light-emitting diode D10 is electrically connected with the positive end of the voltage-regulator tube D15; the cathode end of the voltage regulator tube D12, the cathode end of the voltage regulator tube D13, the cathode end of the voltage regulator tube D14, the cathode end of the voltage regulator tube D15, the other end of the resistor R12 and the other end of the resistor R13 are all electrically connected with the S pole end of the MOS tube Q1.

Further, the rectifier circuit includes a diode D3, a diode D4, a diode D5, and a diode D6; the wiring terminal comprises a positive terminal and a negative terminal;

the positive terminal is electrically connected to the positive terminal of the diode D3 and the negative terminal of the diode D5, respectively; the negative terminal is electrically connected to the positive terminal of the diode D4 and the negative terminal of the diode D6, respectively; the positive terminal of the diode D5 and the positive terminal of the diode D6 are both grounded; the negative terminal of the diode D3 and the negative terminal of the diode D4 are electrically connected to the positive terminal of the diode D1. The polarity of the input voltage can be controlled by the rectifying circuit, so that the input voltage is not divided into positive and negative, and the tool can be used for discharging without dividing alternating current and direct current.

Further, a fuse F1 is connected in series to an electric connection line between the positive terminal and the diodes D3 and D5. The safety can be enhanced by using the fuse F1.

Furthermore, the positive terminal and the negative terminal both adopt elastic electrode rods, and the end parts of the two elastic electrode rods are bent in opposite directions. Two elastic electrode rods bent in opposite directions can be in good contact with capacitors with different spans.

Furthermore, the wiring terminal, the rectifying circuit, the constant current discharge circuit and the LED indicating circuit are all arranged on a strip-shaped circuit board and are arranged in the transparent shell together with the strip-shaped circuit board; the positive terminal and the negative terminal of the wiring terminal extend out of the transparent shell. The transparent shell is utilized to not only not influence the display of the light emitting diode, but also achieve better safety protection.

Compared with the prior art, the utility model, its beneficial effect is: the polarity of the input voltage can be controlled by using the rectifying circuit, so that the input voltage is not divided into positive and negative, and the tool can be used for discharging without dividing alternating current and direct current; the MOS constant current circuit is used in the capacitor discharge tool, compared with the original discharge tool, the volume of the tool is greatly reduced, and the service life of the capacitor is not influenced by constant current discharge.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.

Example 1:

as shown in fig. 1, the utility model discloses a switching power supply maintains with input filter capacitor's constant current discharge tool includes: the device comprises a wiring terminal, a rectifying circuit and a constant current discharge circuit;

Further, the LED display device also comprises an LED indicating circuit;

the positive terminal is electrically connected to the positive terminal of the diode D3 and the negative terminal of the diode D5, respectively; the negative terminal is electrically connected to the positive terminal of the diode D4 and the negative terminal of the diode D6, respectively; the positive terminal of the diode D5 and the positive terminal of the diode D6 are both grounded; the negative terminal of the diode D3 and the negative terminal of the diode D4 are electrically connected to the positive terminal of the diode D1.

Further, a fuse F1 is connected in series to an electric connection line between the positive terminal and the diodes D3 and D5.

Furthermore, the positive terminal and the negative terminal both adopt elastic electrode rods, and the end parts of the two elastic electrode rods are bent in opposite directions.

Furthermore, the wiring terminal, the rectifying circuit, the constant current discharge circuit and the LED indicating circuit are all arranged on a strip-shaped circuit board and are arranged in the transparent shell together with the strip-shaped circuit board; the positive terminal and the negative terminal of the wiring terminal extend out of the transparent shell.

When the constant current discharging tool of the input filter capacitor for maintaining the switching power supply is used, after the positive terminal and the negative terminal are contacted with two electrodes of a capacitor to be detected, capacitor voltage reaches a constant current discharging circuit through a diode D3 or a diode D4; the constant-current discharge circuit utilizes a constant-current working area of an MOS (metal oxide semiconductor), a voltage-stabilizing tube D11 is adopted to stabilize the voltage of a G pole of an MOS tube Q1 to GND, meanwhile, a resistor R14 and a resistor R15 are connected in series to an S pole of an MOS tube Q1, when the voltage of the D pole of the MOS tube Q1 is high enough, the current on the resistor R14 and the resistor R15 is clamped, the purpose of constant current is achieved, the input power is heated and consumed on the MOS tube Q1, and a light-emitting diode D2 connected in series to the D pole of an MOS tube Q1 in the constant-current stage indicates whether the discharge is finished; after passing through the constant current discharge circuit, the voltage is directly input into the LED indicating circuit and is used for displaying the real-time voltage range of the capacitor, the LED indicating circuit realizes the display of four gears, namely 30V, 60V, 100V and 200V, and if the voltage of the capacitor is more than 200V, four of the light-emitting diode D7, the light-emitting diode D8, the light-emitting diode D9 and the light-emitting diode D10 are fully bright; if the capacitor voltage is between 100V and 200V, three lights are on; if the capacitor voltage is between 60V and 100V, two lights are on; if the capacitor voltage is between 30V and 60V, lightening one; if the capacitor voltage is below 30V, four are all extinguished.

The utility model discloses a constant current discharging tool of input filter capacitor for maintaining switch power supply, which uses MOS constant current circuit in the capacitor discharging tool, compared with the original discharging tool, the volume of the tool is greatly reduced, and the service life of the capacitor can not be influenced by constant current discharging; the LED indicating circuit can indicate whether the capacitor is charged or not and can display the voltage range of the capacitor; the positive terminal and the negative terminal are designed into splayed shapes bent in opposite directions by using steel wires with good elasticity, and can be well contacted with capacitors with different spans; the transparent shell adopts transparent acrylic shell, which does not affect the display of the LED and can achieve better safety protection.

As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a switching power supply maintenance is with constant current discharge instrument of input filter capacitor which characterized in that: the constant current discharge circuit comprises a wiring terminal, a rectifying circuit and a constant current discharge circuit;

2. The constant current discharge tool of the input filter capacitor for the maintenance of the switching power supply according to claim 1, wherein: the LED display device also comprises an LED indicating circuit;

3. The constant current discharge tool of the input filter capacitor for the maintenance of the switching power supply according to claim 1, wherein: the rectifying circuit comprises a diode D3, a diode D4, a diode D5 and a diode D6; the wiring terminal comprises a positive terminal and a negative terminal;

4. The constant current discharge tool of the input filter capacitor for the maintenance of the switching power supply according to claim 3, wherein: a fuse F1 is connected in series to an electric connection line between the positive terminal and the diodes D3 and D5.

5. The constant current discharge tool of the input filter capacitor for the maintenance of the switching power supply according to claim 3, wherein: the positive terminal and the negative terminal are both elastic electrode rods, and the ends of the two elastic electrode rods are bent in opposite directions.

6. The constant current discharge tool of the input filter capacitor for the maintenance of the switching power supply according to claim 3, wherein: the wiring terminal, the rectifying circuit, the constant current discharge circuit and the LED indicating circuit are all arranged on a strip-shaped circuit board and are arranged in the transparent shell together with the strip-shaped circuit board; the positive terminal and the negative terminal of the wiring terminal extend out of the transparent shell.