Switching power supply for computer

Abstract

The utility model relates to the technical field of switching power supplies, in particular to a switching power supply for a computer, which comprises an input filtering unit, a main power supply unit, a standby power supply unit and a control unit. The main power supply unit is used for supplying power to internal components of the computer; the hard disk protection unit comprises a battery, a control switch and a dual-power-supply switching circuit, the battery is connected with the dual-power-supply switching circuit through the control switch, the control switch is further connected with the feedback circuit, and the dual-power-supply switching circuit is connected with the voltage output end of the main power supply output circuit; and the standby power supply unit is used for outputting a wake-up signal to the computer mainboard. When the power supply received by the hard disk drive is accidentally interrupted, a functional power supply is provided for the hard disk drive again, so that the data read and written by the hard disk drive are prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of switching power supplies, and more specifically, to a switching power supply for a computer. Background Art

[0002] A switching power supply is a high-frequency electric energy conversion device that mainly uses power electronic switching devices (such as transistors, MOS tubes, controllable thyristors, etc.) to periodically "turn on" and "off" the electronic switching devices through control circuits, allowing the power electronic switching devices to pulse modulate the input voltage, thereby achieving voltage conversion and adjustable output voltage and automatic voltage stabilization.

[0003] The main power supply of the switching power supply can output a variety of voltages. The +12V voltage is connected to high-power devices such as hard disk drives, optical drives, and fans; the +5V voltage is connected to digital circuits and devices such as motherboards, CPUs, memory, and expansion cards; and the +3.3V voltage is provided to low-power components such as interface circuits and internal logic circuits. When there is a sudden power outage or the computer power cord is accidentally unplugged, the hard disk drive will not receive power supply, and the data being read and written by the hard disk may be lost and damaged. Multiple power outages on the hard disk may cause damage to the hard disk. Utility Model Content

[0004] In order to solve the problem that the hard disk drive suddenly loses power supply, which may cause the data being read or written by the hard disk to be lost or damaged, the utility model provides solutions in the following aspects.

[0005] The utility model provides a switching power supply of a computer, comprising: an input filtering unit, which filters and rectifies the received 220V alternating current, inputs a first direct current to a main power unit, and also inputs a second direct current to a standby power unit; the main power unit comprises a main power output circuit and a feedback circuit, the main power output circuit outputs a plurality of third direct currents of different voltages to internal components of the computer, the feedback circuit receives the plurality of third direct currents of different voltages, and sends a feedback control signal to the main power output circuit, the feedback circuit also outputs a PG signal and a ps / on signal; a hard disk protection unit, which comprises a battery, a control switch and a dual power switching circuit, the battery is connected to the dual power switching circuit through the control switch, the control switch is also connected to the feedback circuit, and the dual power switching circuit is connected to the voltage output end of the main power output circuit; a standby power unit, which comprises a standby power switch tube and a standby power switch transformer, the standby power switch tube receives the second direct current output by the input filtering unit, and the voltage signal output by the standby power switch transformer.

[0006] In one embodiment, the dual power switching circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a first diode VD1, a second diode VD2, a MOS tube Q and a voltage regulator chip, one end of the first resistor R1 and one end of the third resistor R3 are connected to the +12V voltage output end of the switching regulator, the other end of the first resistor R1 is connected to the gate of the MOS tube Q, the gate of the MOS tube Q is also grounded through the second resistor R2, the drain of the MOS tube Q is connected to the control switch, and the source of the MOS tube Q is connected to the control switch. The third resistor R3 is connected to the anode of the first diode VD1, the cathode of the first diode VD1 is connected to the Vin pin of the voltage regulator chip, the other end of the third resistor R3 is connected to the anode of the second diode VD2, the cathode of the second diode VD2 is connected to the Vin pin of the voltage regulator chip, the Vin pin and CE pin of the voltage regulator chip are grounded through the first capacitor C1, the VSS pin of the voltage regulator chip is grounded, the Vout pin of the voltage regulator chip is grounded through the second capacitor C2, and the Vout pin of the voltage regulator chip is the output port of the dual power switching circuit.

[0007] In one embodiment, the voltage regulator chip is of model XC6204.

[0008] In one embodiment, both the first diode VD1 and the second diode VD2 are Schottky diodes.

[0009] In one embodiment, the MOS transistor Q is a P-channel MOS transistor.

[0010] In one embodiment, the main power output circuit includes: a main power switch tube, a main power switch transformer and a main power rectifier filter. The main power switch tube and the main power switch transformer receive the first direct current output by the input filter unit. The main power switch tube receives the feedback signal output by the main power switch transformer. The main power switch transformer is also connected to the main power rectifier filter. The main power rectifier filter outputs a third direct current of multiple different voltages to the internal components of the computer. The +12V voltage output terminal of the main power rectifier filter is also connected to the dual power switching circuit as the +12V voltage output terminal of the main power output circuit.

[0011] In one embodiment, the feedback circuit includes: a switching regulator, a push tube and a drive transformer, the switching regulator receives the output voltage signal of the main power rectifier filter and outputs a PG signal and a ps / on signal, the switching regulator is connected to the control switch, and the switching regulator also outputs a control signal to the push tube, the push tube is connected to the main power switch tube through the drive transformer, and controls the conduction or shutdown of the main power switch tube.

[0012] In one embodiment, the input filtering unit includes: a first-stage EMI filter, a second-stage EMI filter and a full-bridge rectifier filter. The first-stage EMI filter filters and processes the 220V AC signal and outputs it. The second-stage EMI filter filters and processes the output signal of the first-stage EMI filter and outputs it. The full-bridge rectifier filter rectifies and filters the output signal of the second-stage EMI filter and outputs it to the main power supply unit and the standby power supply unit.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides a switching power supply for a computer, wherein a switching regulator of the switching power supply is connected to a control switch, and when the computer is shut down normally, the switching regulator inputs a circuit-breaking signal (usually a low level) to the control switch. When the computer is in normal use, a circuit-passing signal (usually a high level) is input to the switching regulator to the control switch, and the battery and the main power supply unit simultaneously input a +12V voltage to the dual power supply switching circuit. When an unexpected situation such as a power outage occurs, the main power supply unit cannot provide power, and the dual power supply switching circuit switches to battery power supply, so that the hard disk drive continues to work, thereby protecting the data being read and written by the hard disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 is a structural block diagram of a switching power supply for a computer according to an embodiment of the present invention;

[0017] Figure 2 is a circuit schematic diagram of a dual power control switch according to an embodiment of the present invention;

[0018] Figure 3 is a working principle diagram of a control switch according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0020] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0021] Figure 1 4 is a structural block diagram of a switching power supply for a computer according to an embodiment of the present invention.

[0022] like Figure 1 As shown, a switching power supply of a computer includes: an input filter unit, which filters and rectifies the received 220V AC power, inputs a first DC power to the main power unit, and also inputs a second DC power to the standby power unit; the main power unit includes a main power output circuit and a feedback circuit, the main power output circuit outputs a plurality of third DC powers of different voltages to the internal components of the computer, the feedback circuit receives the plurality of third DC powers of different voltages, and sends a feedback control signal to the main power output circuit, the feedback circuit also outputs a PG signal and a ps / on signal; a hard disk protection unit, which includes a battery, a control switch and a dual power switching circuit, the battery is connected to the dual power switching circuit through the control switch, the control switch is also connected to the feedback circuit, and the dual power switching circuit is connected to the voltage output end of the main power output circuit; a standby power unit, which includes a standby power switch tube and a standby power switch transformer, the standby power switch tube receives the second DC power output by the input filter unit, and the voltage signal output by the standby power switch transformer.

[0023] Wherein, the input filtering unit includes: a first-stage EMI filter, a second-stage EMI filter and a full-bridge rectifier filter. The first-stage EMI filter filters and processes the 220V AC signal and outputs it. The second-stage EMI filter filters and processes the output signal of the first-stage EMI filter and outputs it. The full-bridge rectifier filter rectifies and filters the output signal of the second-stage EMI filter and outputs it to the main power supply unit and the standby power supply unit.

[0024] Furthermore, the main power output circuit includes: a main power switch tube, a main power switch transformer and a main power rectifier filter. The main power switch tube and the main power switch transformer receive the first direct current output by the input filter unit. The main power switch tube receives the feedback signal output by the main power switch transformer. The main power switch transformer is also connected to the main power rectifier filter. The main power rectifier filter outputs a plurality of third direct currents of different voltages to the internal components of the computer. The +12V voltage output end of the main power rectifier filter is also connected to the dual power switching circuit as the +12V voltage output end of the main power output circuit. The feedback circuit includes: a switching regulator, a push tube and a drive transformer. The switching regulator receives the output voltage signal of the main power rectifier filter and outputs a PG signal and a ps / on signal. The switching regulator is connected to the control switch. The switching regulator also outputs a control signal to the push tube. The push tube is connected to the main power switch tube through the drive transformer to control the on or off of the main power switch tube.

[0025] It should be noted that when the dual power switching circuit cannot receive the +12V voltage output by the main power supply unit, the dual power switching circuit uses the battery as the power supply output; when the dual power switching circuit can receive the +12V voltage output by the main power supply unit, the dual power switching circuit enables the main power supply unit to function as a hard disk.

[0026] In particular, when the computer is in working state, the main power supply unit is used to provide the power supply required for normal operation of the internal devices of the computer. For example: provide +12V power to high-power devices such as hard disk drives, optical drives, fans, etc.; provide +5V power to digital circuits and devices such as motherboards, CPUs, memory, expansion cards, etc.; provide +3.3V power to low-power components such as interface circuits and internal logic circuits. When the computer enters standby mode by manual shutdown, the computer will suspend most activities. At this time, the switching regulator inputs a shutdown signal to the control switch, and neither the battery nor the main power supply unit supplies power to the hard disk drive. When there is a sudden power outage or the power cord of the computer is unplugged, the +12V power provided by the main power supply unit to the hard disk drive disappears instantly. At this time, because the control switch is in the on state, the battery supplies power to the hard disk drive through the dual power control switch.

[0027] Figure 2 4 is a circuit diagram of a dual power control switch according to an embodiment of the present invention.

[0028] like Figure 2As shown, the dual power switching circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a first diode VD1, a second diode VD2, a MOS tube Q and a regulator chip, one end of the first resistor R1 and one end of the third resistor R3 are connected to the +12V voltage output end of the switching regulator, the other end of the first resistor R1 is connected to the gate of the MOS tube Q, the gate of the MOS tube Q is also grounded through the second resistor R2, the drain of the MOS tube Q is connected to the control switch, and the source of the MOS tube Q is connected to the The anode of the first diode VD1 is connected, the cathode of the first diode VD1 is connected to the Vin pin of the voltage regulator chip, the other end of the third resistor R3 is connected to the anode of the second diode VD2, the cathode of the second diode VD2 is connected to the Vin pin of the voltage regulator chip, the Vin pin and CE pin of the voltage regulator chip are grounded through the first capacitor C1, the VSS pin of the voltage regulator chip is grounded, the Vout pin of the voltage regulator chip is grounded through the second capacitor C2, and the Vout pin of the voltage regulator chip is the output port of the dual power switching circuit.

[0029] In particular, when the control switch is in the on state and the power cord of the computer is unplugged (or a power outage occurs), the standby power switch transformer does not output a voltage signal, and the gate of the MOS tube Q is in a low level state, so the source and drain of the MOS tube Q are connected, and the battery starts to supply power to the hard disk drive. When the control switch is in the off state, the computer is shut down normally, and the battery does not supply power to the hard disk drive.

[0030] In one embodiment, the voltage regulator chip is of model XC6204. The voltage regulator chip of model XC6204 is a low voltage drop linear voltage regulator chip, which is a low power consumption, high performance voltage regulator suitable for power management and circuit design applications.

[0031] In one embodiment, the first diode VD1 and the second diode VD2 are both Schottky diodes. Schottky diode is a special type of diode. It is different from ordinary PN junction diodes. It has a lower forward voltage drop, fast switching speed, short reverse recovery time, and good high-frequency characteristics and low power consumption. Schottky diode is composed of metal and semiconductor materials. The metal part is called Schottky pole and the semiconductor part is called substrate.

[0032] In one embodiment, the MOS transistor Q is a P-channel MOS transistor. When the gate of the MOS transistor Q receives a low-level signal, a positive charge is formed on the gate, so that the carriers in the P-type channel region are repelled, resulting in the channel being closed, thereby blocking the current flow between the drain and the source. When the gate of the MOS transistor Q receives a high-level signal, a negative charge is formed on the gate, which attracts the carriers in the P-type channel region, making the channel conductive, and the current can flow from the drain to the source, and the battery supplies power to the hard disk drive of the computer.

[0033] Figure 3 4 is a working principle diagram of a control switch according to an embodiment of the present invention.

[0034] like Figure 3 As shown, when the computer is out of power or the power cord is unplugged, the control switch will not receive the control signal, so it is in the on state. At this time, the main power unit cannot supply power to the hard disk drive, and the battery supplies power to the hard disk drive through the dual power switching circuit. When the computer is shut down normally through the power cord, the control switch receives the disconnect control signal and disconnects. At this time, the main power unit and the battery cannot supply power to the hard disk drive. When the computer is turned on normally through the power cord, the control switch receives the on control signal and conducts. At this time, the main power unit and the battery both provide +12V voltage power to the dual power switching circuit, and the dual power switching circuit enables the main power unit to supply power to the hard disk drive.

[0035] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0036] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0037] Although this specification has shown and described a plurality of embodiments of the utility model, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted. The attached claims are intended to define the scope of protection of the utility model, and therefore cover the modular composition, equivalent or alternatives within the scope of these claims.

Claims

1. A switching power supply for a computer, It is characterized in that include: An input filter unit filters and rectifies the received 220V AC power, inputs a first DC power to the main power unit, and inputs a second DC power to the standby power unit; The main power supply unit includes a main power supply output circuit and a feedback circuit, wherein the main power supply output circuit outputs a plurality of third direct currents of different voltages to internal components of the computer, the feedback circuit receives the plurality of third direct currents of different voltages and sends a feedback control signal to the main power supply output circuit, and the feedback circuit also outputs a PG signal and a ps / on signal; A hard disk protection unit, comprising a battery, a control switch and a dual power supply switching circuit, wherein the battery is connected to the dual power supply switching circuit through the control switch, the control switch is also connected to the feedback circuit, and the dual power supply switching circuit is connected to the voltage output terminal of the main power supply output circuit; The standby power supply unit comprises a standby power switch tube and a standby power switch transformer, wherein the standby power switch tube receives the second direct current output by the input filter unit and the voltage signal output by the standby power switch transformer.

2. A switching power supply for a computer according to claim 1, It is characterized in that The dual power switching circuit comprises: a first resistor (R1), a second resistor (R2), a third resistor (R3), a first capacitor (C1), a second capacitor (C2), a first diode (VD1), a second diode (VD2), a MOS tube (Q) and a voltage regulator chip, one end of the first resistor (R1) and one end of the third resistor (R3) are connected to the +12V voltage output end of the main power output circuit, the other end of the first resistor (R1) is connected to the gate of the MOS tube (Q), the gate of the MOS tube (Q) is also grounded through the second resistor (R2), the drain of the MOS tube (Q) is connected to the control switch, and the MOS tube The source of (Q) is connected to the anode of the first diode (VD1), the cathode of the first diode (VD1) is connected to the Vin pin of the regulator chip, the other end of the third resistor (R3) is connected to the anode of the second diode (VD2), the cathode of the second diode (VD2) is connected to the Vin pin of the regulator chip, the Vin pin and CE pin of the regulator chip are grounded through the first capacitor (C1), the VSS pin of the regulator chip is grounded, the Vout pin of the regulator chip is grounded through the second capacitor (C2), and the Vout pin of the regulator chip is the output port of the dual power switching circuit.

3. A switching power supply for a computer according to claim 2, It is characterized in that The model of the voltage regulator chip is XC6204.

4. A switching power supply for a computer according to claim 2, It is characterized in that The first diode (VD1) and the second diode (VD2) are both Schottky diodes.

5. A switching power supply for a computer according to claim 2, It is characterized in that The MOS tube (Q) is a P-channel MOS tube.

6. A switching power supply for a computer according to claim 1, It is characterized in that The main power output circuit includes: a main power switch tube, a main power switch transformer and a main power rectifier filter. The main power switch tube and the main power switch transformer receive the first direct current output by the input filter unit. The main power switch tube receives the feedback signal output by the main power switch transformer. The main power switch transformer is also connected to the main power rectifier filter. The main power rectifier filter outputs a plurality of third direct currents of different voltages to the internal components of the computer. The +12V voltage output end of the main power rectifier filter is also connected to the dual power switching circuit as the +12V voltage output end of the main power output circuit.

7. A switching power supply for a computer according to claim 6, It is characterized in that The feedback circuit includes: a switching regulator, a push tube and a drive transformer. The switching regulator receives the output voltage signal of the main power rectifier filter and outputs a PG signal and a ps / on signal. The switching regulator is connected to the control switch. The switching regulator also outputs a control signal to the push tube. The push tube is connected to the main power switch tube through the drive transformer to control the on or off of the main power switch tube.

8. A switching power supply for a computer according to claim 1, It is characterized in that The input filter unit includes: a first-stage EMI filter, a second-stage EMI filter and a full-bridge rectifier filter. The first-stage EMI filter filters and processes the 220V AC signal and outputs it. The second-stage EMI filter filters and processes the output signal of the first-stage EMI filter and outputs it. The full-bridge rectifier filter rectifies and filters the output signal of the second-stage EMI filter and outputs it to the main power supply unit and the standby power supply unit.

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