CN200997568Y - Power switch control structure of power supply - Google Patents

Abstract

The utility model relates to a power switch control structure of a power supply, which is used to control the power of the power supply. The power supply includes a rectifier unit, a standby power system, a pulse width modulation controller and a main power unit. The standby power system controls whether the pulse width modulation controller can obtain the DC power required for work, and the power switch control structure of the power supply sets a first switch unit on the path of obtaining the DC power at the front end of the standby power system, so that the first switch unit controls whether the standby power system works, thereby controlling the power supply to be turned on or off.

Description

Power switch control structure of power supply

technical field

A power switch control structure of a power supply, in particular a switch structure for controlling the conduction or disconnection of DC power required by the standing power system in the power supply.

Background technique

Please refer to Fig. 1, show the known circuit structure diagram of a power supply in this figure, comprise an EMI filter 1, a rectification unit 2, a standing power system 3, a pulse width modulation controller 5, a Power factor correction circuit 6, a main power system 7, a first switch unit 8 and a second switch unit 4, wherein the EMI filter 1 is used for preliminary filtering when the AC power input source 9 inputs AC power, and the EMI The front end of the filter 1 is controlled by a first switch unit 8 to determine whether the input end of the AC power input source 9 is turned on. After the AC power is input from the first switch unit 8, it passes through the EMI filter 1 and reaches the rectifier unit 2. The rectifier unit 2 performs initial rectification of the AC power and converts it into DC power to provide the standing power system 3 to work. The standing power system 3 provides the system standing power. After the second switch unit 4 is triggered, it commands the pulse width modulation. The variable controller 5 works to generate the work cycle required for the normal operation of the power factor correction circuit 6 and the main power system 7; and this known structure increases the required current with the continuous improvement of the output power of the power supply. The current bearing capacity of the first switch unit 8 located at the input end of the AC power must also be greatly improved, resulting in a large increase in the size of the first switch unit 8, and the limited space of the power supply, the enlarged first switch The design of the unit 8 is difficult, and the current of the first switch unit 8 needs to be lower than the requirements of the safety regulations. Therefore, the known structure of the first switch unit 8 becomes a design obstacle for high-power power supplies and needs to be improved. .

Contents of the invention

Therefore, the main purpose of this utility model is to provide a power switch control structure, which can reduce the current flowing through the first switch unit, so that the first switch unit can use components with low current bearing capacity to control the operation of the power supply .

The power switch control structure of the power supply according to the utility model is mainly used for a rectifier unit, a standing power system, a pulse width modulation controller and a main power system controlled by the pulse width modulation controller A power supply, and whether the pulse width modulation controller works is determined by whether the standing power system works normally, and the power switch control structure arranges a first switch unit on the DC power line driving the standing power system, so that The first switch unit can control whether the path is turned on, by controlling the power source of the standing power system and then controlling whether a second switch unit and the pulse width modulation controller at the rear end work, so that the power supply is controlled by the first The switch unit controls the opening or closing; because the power required by the standing power system is rectified by a rectifier unit and shunted to the standing power system, and the output power of the standing power system is smaller than that of the main power system, so the standing power system The required current is relatively low, so the current flowing through the first switch unit is small, and the first switch unit with small size and low cost can be selected to achieve the required function.

Description of drawings

FIG. 1 is a block diagram of a known power supply.

Fig. 2 is a block diagram of the power switch control structure according to the present invention.

Fig. 3 is a perspective view of a computer.

Detailed ways

The utility model is a power switch control structure of a power supply, which includes an AC power input source 9, a rectification unit 2, a standing power system 3 and a main power system 7, the rectification unit 2 is connected to the AC power input The source 9 rectifies and outputs DC power, and the standing power system 3 is driven by the DC power. At the output end of the rectification unit 2, a main power system 7 is connected in parallel with the standing power system 3 and is jointly driven by the DC power , wherein, a first switch unit 8 is provided on the DC power line driving the standing power system 3, and when the first switch unit 8 is in a short-circuit state, the standing power system 3 is normally obtained with DC power, thereby electrically driving a second The switch unit 4 enables the second switch unit 4 to generate a switch signal, and controls whether the main power system 7 obtains the DC power to work.

Please refer to Fig. 2, this figure shows the block diagram of the present utility model, and this power supply includes a rectifier unit 2, a standing power system 3, a pulse width modulation controller 5, a main power system 7, a first switch Unit 8 and a second switch unit 4, wherein the power supply can also include an EMI filter 1 and a power factor correction circuit 6, the input end of the rectification unit 2 is connected to an AC power input source 9, and passes through the EMI filter 1 and the rectifier unit 2 are converted into DC power, and output to the parallel standing power system 3 and the main power system 7 at the same time, the utility model is provided with a first switch unit 8 on the DC power line driving the standing power system 3, The first switch unit 8 can control the DC power line to be turned on or off; when the first switch unit 8 is turned on, the standing power system 3 will output the standing DC power after obtaining power, and the second switch unit 4 After triggering, the pulse width modulation controller 5 is ordered to work, so that the pulse width modulation controller 5 generates the periodic signal required by the power factor correction circuit 6 and the main power system 7, so that the main power system 7 normally outputs power ; If the first switch unit 8 is disconnected, the standing power system 3 cannot work, and the second switch unit 4 and the pulse width modulation controller 5 at the rear end cannot operate, and the main power system 7 has no output; therefore, In the utility model, the first switch unit 8 is arranged on the DC power line driving the standing power system 3, which can control whether the power supply is working, and the DC current input to the standing power system 3 is far more than the known AC power. The AC current at the input terminal is small, so the first switch unit 8 can select components with lower current bearing capacity according to the magnitude of the DC current.

Referring to Fig. 3, the appearance of a computer is shown in the figure, a power supply 10 is arranged at the rear upper end of the casing 11, the first switch unit 8 and the AC power input source 9 are arranged on the panel of the power supply 10, the computer The front panel of the front panel is provided with the second switch unit 4, and the power for the operation of the second switch unit 4 is provided by the standing power system 3. In a known structure, the first switch unit 8 controls whether the AC power input source 9 is turned on or not. The utility model uses the first switch unit 8 to control the DC power source required by the standing power system 3 of the power supply 10, thereby controlling the power supply 10 whether there is standing power; the utility model can reduce the current flowing through the first switch unit 8, and can choose the first switch unit 8 with small volume and low cost, and solve the space design problem of the power supply 10 and the Comply with the requirements of multinational safety regulations.

In order to highlight the progress of the utility model, the advantages of the utility model are listed as follows:

1. Reduce the size of the first switch unit, saving the internal space of the power supply.

2. Reduce the cost of the first switching unit.

3. Comply with safety regulations on the current size of the first switch unit.

Although the utility model has been described in detail by preferred embodiments, it is not intended to limit the utility model, such as where the rectifier unit 2 can be a bridge rectifier or a rectifier circuit that can convert alternating current and direct current. Personnel, without departing from the spirit and scope of the present utility model, some modifications and improvements made shall be included in the present utility model, so the protection scope of the present utility model shall be defined by the patent scope of the application as the criterion.

In summary, the utility model has the above-mentioned functions compared with the known circuits, and should have fully met the statutory requirements of novelty and creativity. Therefore, an application is filed according to law, and I kindly ask your office to approve the utility model patent application.

Claims (7)

1. A power switch control structure of a power supply, characterized in that the power switch control structure of the power supply includes: an AC power input source (9); A rectification unit (2), connected to the AC power input source (9) and rectified to output DC power; a standing power system (3) driven by said DC power, and a main power system (7) connected in parallel with said standing power system (3) and jointly driven by said DC power; and Wherein, a first switch unit (8) is arranged on the direct current power line driving the standing power system (3), and when the first switch unit (8) is in a conduction state, the standing power system (3) The DC power is normally obtained to drive a second switch unit (4), so that the second switch unit (4) generates a switch signal to control the main power system (7) to obtain the DC power to work. 2. The power switch control structure of a power supply according to claim 1, wherein the rectification unit (2) is a bridge rectifier. 3. The power switch control structure of a power supply according to claim 1, characterized in that, the power required for the operation of the second switch unit (4) is provided by the standing power system (3). 4. The power switch control structure of the power supply according to claim 1, characterized in that, the power supply further comprises a pulse width modulation controller (5), and the pulse width modulation controller provides the For the working cycle of the main power system (7), a power factor correction circuit (6) is provided, and the power factor correction circuit adjusts the working efficiency of the main power system (7). 5 . The power switch control structure of a power supply according to claim 4 , wherein the pulse width modulation controller ( 5 ) starts to work according to the trigger of the second switch unit ( 4 ). 6. The power switch control structure of a power supply according to claim 4, wherein the pulse width modulation controller (5) generates a duty cycle of the main power system (7). 7. The power switch control structure of a power supply according to claim 4, wherein the power factor correction circuit (6) operates upon receiving a duty cycle generated by the pulse width modulation controller (5).

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