CN201341094Y - power converter - Google Patents

Abstract

The utility model discloses a power converter, it has extremely low stand-by power consumption. The utility model discloses power converter is used for converting an input alternating current power supply to an output direct current power supply, and it has: an electromagnetic interference filter coupled to the input AC power source for filtering electromagnetic interference; a bidirectional AC triac switch having a gate, a first channel terminal and a second channel terminal, the first channel terminal being coupled to the EMI filter for connection to the input AC power source; and the triode driver is used for driving the grid of the bidirectional alternating current trigger triode switch according to a switching signal of a load device so as to control the electrical connection of the first channel end and the second channel end.

Description

power converter

technical field

The utility model relates to a converter from an AC power supply to a DC power supply, in particular to a power converter with extremely low standby power consumption, which is used to provide extremely low standby power consumption under light load or no-load conditions, so as to comply with environmental protection , Power saving requirements.

Background technique

In order to reduce power consumption under light load or no-load conditions, current AC-to-DC power converters generally set switching elements, such as relays, at the AC power input to provide a mechanism for shutting down the AC power; however, at the AC power input Arranging an additional switching element here has the following disadvantages: 1. Increase cost, 2. Reduce conversion efficiency, 3. Influence heat dissipation. The above-mentioned shortcomings will cause the industry to bear higher operating costs and reduce the performance of the power converter. Therefore, there is an urgent need for a low-cost method that does not reduce conversion efficiency or affect heat dissipation to achieve a very low standby power consumption. power converter.

Aiming at the shortcomings of the standby means of the existing AC-to-DC power converter, the utility model proposes a solution for interrupting the power conversion without setting a switching element such as a relay at the input of the AC power supply. In the utility model, the power converter is designed to have a normal conversion mode and an AC power blocking mode. The power converter can be enabled to work in the normal conversion mode or disabled to work in the AC power blocking mode to keep the power supply The converter enters a low-power standby state.

Utility model content

An object of the present utility model is to provide a power converter with extremely low standby power consumption, which can interrupt the power conversion without setting a relay at the input of the AC power supply, so that the power converter enters a low power consumption standby state.

Another object of this utility model is to provide a power converter with extremely low standby power consumption, which has a bidirectional AC triode switch, which can control the supply and output of AC power, so that the power converter can work in the normal state conversion mode, or disable the power converter and work in the AC power blocking mode to enter a low-power standby state.

In order to achieve the above-mentioned purpose, the utility model proposes a power converter with extremely low standby power consumption, which is used to convert an input AC power supply into an output DC power supply, which has: an electromagnetic wave interference filter coupled to the input AC power supply to filter electromagnetic wave interference; a bidirectional AC triode switch, which has a grid, a first channel end and a second channel end, the first channel end is coupled to the electromagnetic wave interference filter for connected to the input AC power; and a triode driver, used to drive the gate of the bidirectional AC triode switch according to a switch signal of a load device, so as to control the electrical connection between the first channel end and the second channel end.

A power converter with extremely low standby power consumption for converting an input AC power into an output DC power, which has:

An electromagnetic wave interference filter, coupled to the input AC power supply to filter out electromagnetic wave interference;

A bidirectional AC triode switch, which has a grid, a first channel end and a second channel end, the first channel end is coupled to the electromagnetic wave interference filter for connecting to the input AC power; and

A bidirectional AC triode driver is used to drive the grid of the bidirectional AC triode switch according to a switching signal of a load device, so as to control the electrical connection between the first channel end and the second channel end.

The power converter described above, wherein the bidirectional AC triode driver is an optically coupled and isolated bidirectional AC triode driver, which has a control side and a channel side, and the control side is driven by the switching signal of the load device. When a current is formed on the control side, the channel side is turned on, so that the first channel end of the bidirectional AC triode switch is electrically connected to the second channel end; when there is no current on the control side, the channel side is closed, resulting in The first channel end and the second channel end of the bidirectional AC triode switch are insulated from each other.

The power converter further has a protection resistor placed between the bidirectional AC triode switch and the bidirectional AC triode driver to protect the bidirectional AC triode driver.

The power converter further has a grid resistor, one end of the grid resistor is coupled to the grid of the bidirectional AC triode switch, and the other end of the grid resistor is coupled to the gate from the first channel. One of the groups of the terminal and the second channel terminal is used to improve the noise immunity and thermal stability of the bidirectional AC triode switch.

The power converter further has an input rectification filter coupled to the second channel end of the bidirectional AC triode switch for generating a first voltage.

The power converter described above further has a main transformer and an output rectifying filter, wherein the main transformer generates a second voltage according to the first voltage, and the output rectifying filter generates the output DC according to the second voltage power supply.

The power converter further has a voltage feedback circuit coupled to the output rectification filter to provide a feedback voltage.

The power converter described above further has a power factor correction/pulse width modulation controller, which generates a power factor correction driving signal according to a power factor correction sensing signal and generates a pulse width modulation according to the feedback voltage Signal.

The power converter further has a power factor boosting circuit, which has a metal oxide semiconductor, and can operate according to the power factor correction driving signal to improve the power factor.

In the power converter, the load device is a portable electronic device.

The beneficial effect of the utility model is that the provided power converter with extremely low standby power consumption has a bidirectional AC triode switch, which can control the supply and output of AC power, so that the power converter can work in the normal state. conversion mode, or disable the power converter and work in the AC power blocking mode to enter a low-power standby state.

In order to further understand the structure, features and purpose of the present utility model, drawings and detailed descriptions of preferred specific embodiments are attached hereafter.

Description of drawings

FIG. 1 is a schematic diagram showing a block diagram of a power converter according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram showing a circuit diagram of a power converter (without output rectification filter and voltage feedback circuit) according to a preferred embodiment of the present invention.

Detailed ways

Please refer to Fig. 1, which shows a block diagram of a power converter of a preferred embodiment of the present invention; as shown in the figure, the power converter with extremely low standby power consumption of the present invention can convert an input AC power Become an output DC power supply, which can work in a normal conversion mode or an AC power blocking mode, which includes an electromagnetic wave interference (EMI) filter 101, a bidirectional AC trigger triode (TRIAC) switch 102, and an input rectification filter 103 , a power factor improvement circuit 104, a main transformer 105, an output rectification filter 106, a voltage feedback circuit 107, a power factor correction (PFC)/pulse width modulation (PWM) controller 108 and a triode driver 109 .

Wherein, the EMI filter 101 is placed between the input AC power source and the TRIAC switch 102 to filter possible electromagnetic wave interference.

The bidirectional AC trigger transistor (TRIAC) switch 102 has a gate, a first channel end and a second channel end, the first channel end is coupled to the EMI filter 101 for connecting the input AC power the second channel end is coupled to the input rectifier filter 103; and the gate is coupled to the triode driver 109; The control is electrically connected or insulated from each other. When the first channel end and the second channel end are electrically connected, the power converter works in the normal conversion mode; when the first channel end and the second channel end are insulated from each other, the power converter works in the AC power blocking mode.

The input rectification filter 103 receives the input AC power through the second channel end of the TRIAC switch 102 , and rectifies and filters the input AC power to provide a ripple voltage.

The power factor boosting circuit 104 is placed between the input rectifier filter 103 and the main transformer 105 for controlling the power factor correction (PFC)/pulse width modulation (PWM) controller 108, the ripple The wave voltage is converted into a first voltage to improve the power factor.

The main transformer 105 can output a second voltage according to the first voltage.

The output rectifying filter 106 can generate the output DC power according to the second voltage.

The voltage feedback circuit 107 is coupled to the output rectification filter 106 to provide a feedback voltage to the power factor correction (PFC)/pulse width modulation (PWM) controller 108 .

The power factor correction (PFC)/pulse width modulation (PWM) controller 108 can generate a power factor correction drive signal to drive the power factor improvement circuit 104 according to a power factor correction sensing signal SPFC, and can follow the feedback voltage to generate a corresponding pulse width modulation signal SP to control the energy conversion of the main transformer 105 so that the output rectifier filter 106 generates the output DC power.

The triode driver 109 has a control side and a channel side, the control side is coupled to the switching signal S _on / _off provided by a load device (not shown in the figure), and the channel side is coupled to the bidirectional AC trigger The gate of the triode (TRIAC) switch 102 . When the switch signal S _on / _off is at a high potential, the channel side generates a driving current so that the first channel end and the second channel end of the bidirectional AC trigger transistor (TRIAC) switch 102 are electrically connected; when the switch signal S When _on / _off is low, the channel side is turned off so that the first channel end and the second channel end of the TRIAC switch 102 are isolated from each other. Wherein the load device can be a portable electronic device such as a notebook computer or an electronic book.

Please refer to Fig. 2, which shows a circuit diagram of a power converter (without output rectification filter and voltage feedback circuit) of a preferred embodiment of the utility model; as shown in the figure, the utility model has an extremely low standby power The power converter of power consumption can convert an input AC power into an output DC power, which includes an EMI filter 201, a bidirectional AC triode 202, an input rectifier filter 203, an EMI filter 203a, a power factor Boosting circuit 204, a main transformer 205, a power factor correction/pulse width modulation controller 206, a resistor 207, a resistor 208, a resistor 209, an optically coupled transistor driver 210, a resistor 211, a resistor 212 and a Resistor 213.

Wherein, the EMI filter 201 is placed between the input AC power supply and the bidirectional AC triode 202 to filter possible electromagnetic wave interference.

The bidirectional AC triode 202 has a gate, a first channel end and a second channel end, the first channel end is coupled to the EMI filter 201 for connecting the input AC power; the second channel terminal is coupled to the input rectifier filter 203; and the grid is coupled to the optically coupled triode driver 210; control while being electrically connected or insulated from each other. When the first channel end and the second channel end are electrically connected, the power converter works in the normal conversion mode; when the first channel end and the second channel end are insulated from each other, the power converter works in the AC power blocking mode.

The input rectification filter 203 receives the input AC power through the second channel end of the bidirectional AC triode 202 , and performs full-wave rectification and filtering on the input AC power to provide a ripple voltage.

The EMI filter 203a is placed between the input rectifying filter 203 and the power factor boosting circuit 204 for filtering possible electromagnetic wave interference.

The power factor boosting circuit 204 is placed between the input rectifier filter 203 and the main transformer 205, and has a metal-oxide-semiconductor (MOS) transistor Q4 for use in the power factor correction/pulse width modulation controller 206. Under control, the ripple voltage is converted into a first voltage to improve the power factor.

The main transformer 205 can output a second voltage according to the first voltage, and then convert it into the output DC power through an output rectifying filter (not shown in the figure).

The power factor correction/pulse width modulation controller 206, such as but not limited to TEA1751, can generate a power factor correction drive signal to drive the MOS transistor Q4 of the power factor improvement circuit 204, and can generate a corresponding feedback voltage according to A pulse width modulation signal (not shown in the figure) is used to output the output DC power.

The resistor 207, the resistor 208 and the resistor 209 form a voltage divider circuit for providing a voltage divider signal of the first voltage to the power factor correction/pulse width modulation controller 206, so that it can respond to the first voltage. Voltage size adjustment control parameters to improve power factor.

The optocoupler transistor driver 210 has a control side and a channel side, one end of the control side is coupled to a switching signal S _on / _off provided by a load device (not shown in the figure) through a resistor 211, and the other end Then it is coupled to the reference ground potential of the switch signal S _on / _off ; one end of the channel side is coupled to the gate of the triac 202 , and the other end is coupled to the resistor 212 . When the switch signal S _on / _off is a high potential, the channel side generates a driving current so that the first channel end and the second channel end of the bidirectional AC triode 202 are electrically connected; when the switch signal S _on / _off is When the potential is low, the channel side is turned off so that the first channel end and the second channel end of the triac 202 are insulated from each other.

The resistor 211 is placed on the control side to limit the current flowing through the control side to protect the optical coupling transistor driver 210 .

The resistor 212 is placed between the first channel end of the bidirectional AC triac 202 and the other channel side end of the optically coupled triac driver 210 to protect the bidirectional AC triac driver.

One end of the resistor 213 is coupled to the gate of the bidirectional AC triac 202 , and the other end is coupled to the second channel end for improving noise immunity and thermal stability of the bidirectional AC triac 202 .

Therefore, through the implementation of the utility model, the bidirectional AC triode can be turned on or off by the optically coupled triode driver, and a power converter that can enter the standby state can be provided; in addition, the optically coupled triode driver is low in cost and Only consumes very little power, does not increase cost or affect conversion efficiency, and can indeed improve the shortcomings of existing power converters.

What the utility model discloses is a preferred embodiment. For example, all partial changes or modifications derived from the technical idea of the utility model and easily deduced by those who are familiar with the art will not break the patent right of the utility model. category. For example, the rectifier module can also be a half-wave rectifier; the PFC loop may not be provided; and the PFC/PWM controller may be composed of two ICs.

Claims (10)

1. power supply changeover device, tool utmost point low standby power loss in order to an input ac power is converted to an output DC source, is characterized in that having:

One Electromagnetic Interference stripper is coupled to this input ac power with the filtering Electromagnetic Interference;

One two-way interchange trigger triode switch, it has a grid, a first passage end and a second channel end, and this first passage end is coupled to this Electromagnetic Interference stripper, in order to connect this input ac power; And

One two-way interchange trigger triode driver is in order to drive the grid of this two-way exchange trigger triode switch according to the switching signal of a load device, to control being electrically connected of this first passage end and second channel end.

2. power supply changeover device as claimed in claim 1, it is characterized in that, this two-way exchange trigger triode driver is the two-way exchange trigger triode driver that an optical coupling is isolated, it has a control side and a channel side, this control side is driven by the switching signal of this load device, when this control side had electric current to form, this channel side was conducting, causes the first passage end of this two-way exchange trigger triode switch and second channel end to be electrically connected; When this control side did not have electric current, this channel side was promptly closed, and caused the first passage end of this two-way exchange trigger triode switch and second channel end insulated from each other.

3. power supply changeover device as claimed in claim 2; it is characterized in that; further have a protective resistance, this protective resistance places between this two-way exchange trigger triode switch and this two-way exchange trigger triode driver, in order to protect this two-way exchange trigger triode driver.

4. power supply changeover device as claimed in claim 3, it is characterized in that, further has a resistance, one end of this resistance is coupled to the grid of this two-way exchange trigger triode switch, the other end of this resistance is coupled to from the group of this first passage end and second channel end and selects one, in order to promote the noise immunocompetence and the heat stability of this two-way exchange trigger triode switch.

5. power supply changeover device as claimed in claim 4 is characterized in that, further has an input rectifying filter, is coupled to the second channel end of this two-way exchange trigger triode switch, in order to produce one first voltage.

6. power supply changeover device as claimed in claim 5, it is characterized in that, further have a main transformer and an output rectifier filter, wherein this main transformer produces one second voltage according to this first voltage, and this output rectifier filter produces this output DC source according to this second voltage.

7. power supply changeover device as claimed in claim 6 is characterized in that, further has a voltage feedback circuit, is coupled to this output rectifier filter so that a feedback voltage to be provided.

8. power supply changeover device as claimed in claim 7, it is characterized in that, further have one power factor correction/pulse width modulation controller, produce a power factor correction drive signal and produce a pulse width modulation signal according to this feedback voltage according to a power factor correction sensing signal.

9. power supply changeover device as claimed in claim 8 is characterized in that, further has a power factor and promotes circuit, and it has a metal-oxide semiconductor (MOS), can operate and the bring to power factor according to this power factor correction drive signal.

10. power supply changeover device as claimed in claim 9 is characterized in that, this load device is a portable electronic devices.