TWI477074B - An electronic system and a filtering alternative current power device - Google Patents

Description

Electronic system and power device for filtering AC power

The present invention relates to an electronic system, and more particularly to an electronic system having the function of filtering AC power.

With the advancement of panel and semiconductor manufacturing technology, LCD TVs are steadily lowering than previous ones, and more and more people are choosing to buy LCD TVs to replace the old image tube TVs. Common LCD TVs have three modes of operation: the backlight module is in the power off mode, the standby mode (Standby Mode) or the power on mode; in the standby mode, the LCD TV transformer is in a low power output state for the user. You can enter the power-on mode at any time, and you can start the LCD TV more quickly. However, this mode of operation has a disadvantage. When the voltage of the AC power source is lower than a minimum operating voltage, the AC power source inputs a very large current to the transformer due to the constant power of the AC power source, resulting in a transformer failure.

In order to solve such a problem, the transformer has a switching circuit connected to an AC power source, and when the voltage of the AC power source is lower than the minimum operating voltage, the switching circuit interrupts the connection with the neutral line of the AC power source. However, such a design will cause the AC power to flow into the transformer from the unclosed live line, causing the LCD TV screen to appear a noise signal and delay for a period of time to shut down the entire power. Therefore, a power circuit design must be developed to solve the problem. The problem of delayed AC power supply shutdown.

Therefore, the object of the present invention is to provide a state of being cut by a low power state. Switch to the off state to quickly filter out the electronic system of the AC power supply.

Therefore, the electronic system of the present invention receives power supply of AC power supplied by a live line and a neutral line, the electronic system includes: a load device; and a power device including: a rectification connection circuit having an electrical connection a live rectifier, a switch module electrically connecting the neutral line and the rectifier, and a voltage dividing module electrically connected between the live line and the rectifier and the switch module, the rectifier rectifying the alternating current And outputting a first DC power, a standby circuit, having a conversion module electrically connected to the rectifier and receiving the first DC power, and a control module electrically connected to the conversion module, the control module having an electric Connecting the rectifier, the voltage dividing module and the working pin of the switch module, when the switch module turns on the alternating current power and the working pin of the control module detects that the alternating current power is higher than a minimum working voltage, The control module controls the conversion module to convert the first DC power into a second DC power to the load device, and a filter circuit, and is disposed on the rectifier and the control module Between the pins, when the switch module closes the connection with the neutral line, the leakage of the AC power flows to the filtering circuit via the live line and the voltage dividing mode component, and is filtered through the filtering circuit. The leakage of the alternating current power reduces the flow of the alternating current into the working pin of the control module to avoid erroneous operation of the control module.

Preferably, the voltage dividing module of the rectifying and connecting circuit further has a first The movable component has one end connected to the live line and the other end connected to the rectifier and connected to the neutral line through the switch module.

More preferably, the standby circuit further includes a second passive component and a third passive component. The control module of the standby circuit further has a grounding pin, the second passive component is connected to the rectifier at one end, and the other end is connected to the control. The working pin of the module, one end of the third passive component is connected to the working pin of the control module, and the other end is connected to the grounding pin of the control module.

Preferably, the filtering circuit is a capacitor.

Preferably, the standby circuit further has a line bypass capacitor electrically connected to the load device and a ground terminal.

Another object of the invention is to provide an electrical device.

Therefore, the power device of the present invention receives power supply of AC power supplied by a live line and a neutral line, and the power device converts the AC power to a load device, and includes: a rectification connection circuit including an electrical connection a rectifier of the line, a switch module electrically connecting the neutral line and the rectifier, and a voltage dividing module electrically connected between the live line and the rectifier and the switch module, the rectifier rectifying the AC power And outputting a first DC power; the standby circuit includes a conversion module electrically connected to the rectifier and receiving the first DC power, and a control module electrically connected to the conversion module, the control module has an electrical connection The rectifier, the voltage dividing module and the working pin of the switch module, when the switch module turns on the alternating current power and the working pin of the control module detects that the alternating current power is higher than a minimum working voltage, The control module controls the conversion module to convert the first DC power into a second DC power is applied to the load device; and a filter circuit is disposed between the rectifier and the working pin of the control module. When the switch module closes the connection with the neutral line, the leakage of the AC power is via The live line and the partial pressure mode component flow to the filtering circuit, and the leakage current of the alternating current power is filtered through the filtering circuit to reduce the flow of the alternating current power to the working pin of the control module, thereby avoiding the control module Misoperation.

The effect of the invention is to reduce the noise caused by the delayed switching of the AC power by providing a filtering circuit electrically connecting the live line and the control module to filter the AC power flowing through the working pin of the control module. Picture.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 and FIG. 2, the electronic system 100 of the present invention uses a power supply of a commercial power source, a first alternating current power ac1 of the commercial power, for example, 110 volts, is supplied to the electronic system 100 via the first power line L1, and a second alternating current power of the commercial power. Ac2, for example 0 volts, is provided to electronic system 100 via second power line L2. The electronic system 100 includes a power device 2 electrically connected to the first power line L1 and the second power line L2 and a load device 3 electrically connected to the power device 2. In this embodiment, the electronic system 100 is a liquid crystal television, and the first power line L1 and the second power line L2 of the commercial power are live (fire) lines and neutral lines, respectively.

The power device 2 includes a rectifying connection circuit 21, a working circuit 22, a standby circuit 23, and a filtering circuit C.

The rectifier connection circuit 21 has a rectifier Re1 for rectifying the mains AC power. The rectifier Re1 has a first end P1 connected to the first power line L1, a second end P2 electrically connected to the second power line, a third end P3 and a fourth The terminal P4, when the first alternating current power ac1 and the second alternating current power ac2 of the first power line L1 and the second power line L2 flow into the rectifier Re1, the rectifier Re1 rectifies the first alternating current power ac1 and the second alternating current power ac2 into a first direct current The power D1 is output through the third terminal P3.

The working circuit 22 has a transformer module 221 electrically connected to the third end P3 of the rectifier Re1 and a control IC 222 electrically connected to the transformer module 221. The control chip 222 controls the transformer module 221 to receive the first The DC power D1 is converted into a second DC power D2 for the load device 3 to operate in an operating mode.

The standby circuit 23 has a conversion module 231 electrically connected to the third end P3 of the rectifier Re1 and a control module 232 electrically connected to the conversion module 231. The control module 232 controls the conversion module 231 to receive the first DC power D1 and convert it into a third DC power D3 for the load device 3 to operate in a standby mode.

In more detail, the working circuit 22 is designed to enable the electronic system 100 to operate in a 12V/0.5A~24V/1.4A mode of operation, while the standby circuit 23 is designed to maintain the electronic system 100 operating at a 5V. The standby mode of /0.12A, of course, is not limited by the above-mentioned operating voltage and current. When the user does not watch the LCD TV temporarily, the LCD TV can be switched from the working mode to the standby circuit 23 to Standby mode to save electricity. Similarly, when the LCD TV needs to be viewed, the LCD TV can be switched from the standby mode to the working mode by the working circuit 22 to increase the reaction speed of the liquid crystal television and increase the convenience of viewing.

The rectifier connection circuit 21 further has a switch module SW1 disposed on the second power line L2 and a voltage dividing module Z1 electrically connected to the live line and the rectifier and the switch module. In this embodiment, the voltage dividing module Z1 is a first passive component, such as a resistor, etc., and the switch module SW1 is a transistor switch. One end of the voltage dividing module Z1 is connected to the first power line L1, and the other end is connected to the second end P2 of the rectifier Re1, so that the second end P2 of the rectifier Re1 is connected to the first power line L1 through the voltage dividing module Z1, and at the same time, the switching module SW1 is used. The second power line L2 is connected. The standby circuit 23 further has a second passive component Z2 and a third passive component Z3. The control module 232 has a working pin BR and a grounded ground pin GND. The function of the working pin BR is to receive the supplied power, and The control module 232 detects whether the supply power has reached a voltage level that can work normally. When the supply power received by the working pin BR has reached the normal working voltage level, the control module 232 causes the conversion module 231 to The DC power D1 is converted into the third DC power D3. In this embodiment, the working pin BR is connected to the second end P2 of the rectifier Re1 through the second passive component Z2, and is connected to the ground pin GND by the third passive component Z3, and grounded. The pin GND passes through the filter circuit C to connect the second end P2 of the rectifier Re1. Further, when the second terminal P2 of the rectifier Re1 is seen to the ground terminal G, the second passive component Z2 and the third passive component Z3 are connected in series with the filtering circuit C, and the filtering circuit C and the third passive component are separated. Z3 is connected to the ground terminal G. In this embodiment, the filter circuit C is a capacitor.

The standby circuit 23 further has a line bypass capacitor (Y capacitor) C1, and the line bypass capacitor C1 is electrically connected to the load device 3 and the ground terminal G, respectively, so that the first power line L1, the power device 2 and the load device 3 form a closed loop. .

When the user wants to turn off the electronic system 100 in the standby mode (ie, the electronic system 100 is switched from the standby mode to the off mode), it is only necessary to turn off the switch module SW1 (opening the switch module SW1), the second power line L2 The two AC power ac2 is not transmitted to the power device 2. However, the first alternating current power ac1 of the first power line L1 is still transmitted to the second end P2 of the rectifier Re1 via the voltage dividing module Z1, and then the first alternating current power ac1 flows to the filtering circuit C, the second passive component Z2, and the first When the parallel circuit composed of the three passive components Z3 is selected, most of the first alternating current power ac1 flows into the filtering circuit C by selecting a filtering circuit C having a large capacitance value. That is, only a small portion of the first AC power ac1 will flow through the second passive component Z2 and the third passive component Z3, and the potential of the working pin BR of the control module 232 approaches zero, so that the control module 232 determines The first AC power ac1 flowing into the working pin BR is less than the lowest operating voltage, so as not to malfunction. Therefore, the working pin BR of the control module 232 cannot affect the operation of the load device 3, and can surely turn off the electronic system. 100.

Referring to FIG. 3 and FIG. 4, the second preferred embodiment of the electronic system 100 of the present invention differs from the first preferred embodiment in that one end of the filtering circuit C is connected to the second end P2 of the rectifier Re1, and the other end is connected to the rectifier Re1. The fourth end of the P4. Thereby, the switch module SW1 is turned off (the switch module SW1 is opened), After flowing through the voltage dividing module Z1, the first alternating current power ac1 of the power line L1 is shunted at the second end P2 of the rectifier Re1. Similarly, the filter removing circuit C causes most of the first alternating current power ac1 current to be filtered. Except that the circuit C flows into the fourth end of the rectifier Re1, only a small portion of the first alternating current power ac1 passes through the partial pressure of the second passive component Z2 and the third passive component Z3 and then flows into the working pin BR of the control module 232. By adjusting the capacitance value of the filter circuit C, most of the first AC power ac1 can flow into the rectifier Re1, thereby reducing the flow of the first AC power ac1 into the working pin BR of the control module 232, and reducing the malfunction of the working pin BR. .

In summary, between the mains and the rectifier Re1, a filtering circuit C is provided to divert the AC power of the mains. The present invention is provided with a filter circuit C connected to the second end P2 of the rectifier Re1. The other end of the filter circuit C may be connected to the ground terminal G or the fourth end P4 of the rectifier Re1. When the electronic system 100 is used, the AC power of the commercial power is introduced to the ground terminal G or the rectifier Re1 via the filter circuit C, and the AC power is prevented from being mis-transmitted to the control module 232 of the standby circuit 23, and the leakage current of the AC power is reduced to the load device. 3, it is indeed possible to achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Electronic system

2‧‧‧Power equipment

21‧‧‧Rected connection circuit

Re1‧‧‧Rectifier

22‧‧‧Working circuit

221‧‧‧Transformer module

222‧‧‧Control wafer

23‧‧‧ Standby circuit

231‧‧‧Transition module

232‧‧‧Control Module

3‧‧‧Loading device

L1‧‧‧First Power Line

L2‧‧‧second power line

Z1‧‧‧ voltage divider module

Z2‧‧‧second passive component

Z3‧‧‧ third passive component

SW1‧‧‧ switch module

C‧‧‧Filter circuit

BR‧‧‧Working pin

GND‧‧‧ Grounding Pin

C1‧‧‧ line bypass capacitor

1 to 2 are schematic diagrams showing a first preferred embodiment of the electronic system of the present invention; and Figs. 3 and 4 are circuit diagrams illustrating a second preferred embodiment of the electronic system of the present invention.

100‧‧‧Electronic system

2‧‧‧Power equipment

21‧‧‧Rected connection circuit

Re1‧‧‧Rectifier

22‧‧‧Working circuit

221‧‧‧Transformer module

222‧‧‧Control wafer

23‧‧‧ Standby circuit

231‧‧‧Transition module

232‧‧‧Control Module

3‧‧‧Loading device

L1‧‧‧First Power Line

L2‧‧‧second power line

Z1‧‧‧ voltage divider module

Z2‧‧‧second passive component

Z3‧‧‧ third passive component

SW1‧‧‧ switch module

C‧‧‧Filter circuit

BR‧‧‧Working pin

GND‧‧‧ Grounding Pin

C1‧‧‧ line bypass capacitor

Claims (10)

An electronic system that receives power from an alternating current power supplied by a live line and a neutral line, the electronic system comprising: a load device; and a power device comprising: a rectifying connection circuit having an electrical connection to the live line a rectifier, a switch module electrically connecting the neutral line and the rectifier, and a voltage dividing module electrically connected between the live line and the rectifier and the switch module, the rectifier rectifying the AC power and Outputting a first DC power, a standby circuit, having a conversion module electrically connected to the rectifier and receiving the first DC power, and a control module electrically connected to the conversion module, the control module having an electrical connection The rectifier, the voltage dividing module and the working pin of the switch module, when the switch module turns on the alternating current power and the working pin of the control module detects that the alternating current power is higher than a minimum working voltage, the control The module controls the conversion module to convert the first DC power into a second DC power to the load device, and a filter circuit disposed on the working pin of the rectifier and the control module When the switch module closes the connection with the neutral line, the leakage of the alternating current power flows to the filtering circuit via the live line and the voltage dividing mode component, and the leakage current of the alternating current power is filtered through the filtering circuit. In order to reduce the erroneous operation of the control module, the AC power is reduced to flow into the working pin of the control module. The electronic system of claim 1, wherein the voltage dividing module of the rectifying connection circuit further has a first passive component, one end of the first passive component is connected to the live wire, and the other end is connected to the rectifier The neutral line is connected through the switch module. The electronic system of claim 2, wherein the standby circuit further includes a second passive component and a third passive component, wherein the control module of the standby circuit further has a grounding pin, the second passive One end of the component is connected to the rectifier, and the other end is connected to the working pin of the control module. One end of the third passive component is connected to the working pin of the control module, and the other end is connected to the grounding pin of the control module. The electronic system of claim 1, wherein the filtering circuit is a capacitor. The electronic system of claim 1, wherein the standby circuit further has a line bypass capacitor electrically connected to the load device and a ground terminal, respectively. A power device for filtering AC power receives power from an AC power supplied by a live line and a neutral line, and the power device converts the AC power to a load device, and includes: a rectification connection circuit including an electric a rectifier connected to the live line, a switch module electrically connected to the neutral line and the rectifier, and a voltage dividing module electrically connected between the live line and the rectifier and the switch module respectively, the rectifier is rectified The alternating current power and outputting a first direct current power; a standby circuit comprising an electrical connection to the rectifier and receiving the first a DC power conversion module and a control module electrically connected to the conversion module, the control module has a working pin electrically connected to the rectifier, the voltage dividing module and the switch module, and the switch module When the AC power is turned on and the working pin of the control module detects that the AC power is higher than a minimum operating voltage, the control module controls the conversion module to convert the first DC power into a second DC power to the load. And a filtering circuit disposed between the rectifier and the working pin of the control module, and when the switch module closes the connection with the neutral line, the leakage of the alternating current power passes through the live line and the The partial compression mode component flows to the filtering circuit, and the leakage current of the alternating current power is filtered through the filtering circuit to reduce the flow of the alternating current power to the working pin of the control module, thereby avoiding the misoperation of the control module. The power device of claim 6, wherein the voltage dividing module of the rectifying connection circuit has a first passive component, one end of the first passive component is connected to the live wire, and the other end is connected to the rectifier and transmitted through The switch module is connected to the neutral line. The power device of claim 7, wherein the standby circuit further includes a second passive component and a third passive component, wherein the control module of the standby circuit further has a grounding pin, the second passive One end of the component is connected to the rectifier, and the other end is connected to the working pin of the control module. One end of the third passive component is connected to the working pin of the control module, and the other end is connected to the grounding pin of the control module. The power device of claim 6, wherein the filtering circuit is a capacitor. The power device of claim 6, wherein the standby circuit further has a line bypass capacitor electrically connected to the load device and a ground terminal.