Green switch power supply with standby function and its IC

• US 7,471,527 B2
• Filed: 01/27/2003
• Issued: 12/30/2008
• Est. Priority Date: 04/18/2002
• Status: Expired due to Fees

• Current Assignee: Tao Jiang, Weibin Chen
• Original Assignee: Tao Jiang, Weibin Chen
• Inventors: Chen, Weibin
• Primary Examiner(s): Sterrett; Jeffrey L
• Application Number:
  US10/510,198
• Publication Number:
  US 20050207189A1
• Time in Patent Office: 2,164 Days
• Field of Search: 363/21.12, 363/21.15, 363/21.16, 363/21.18, 363/49, 363/65, 363/97, 363/147
• US Class Current: 363/65
• CPC Class Codes: H02M 1/0032 Control circuits allowing low power mode operation, e.g. in standby mode
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02M 1/40 Means for preventing magnetic saturation
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A switch power supply with standby function is disclosed. The power supply can satisfy the need of the green environment protection. And a single ended green switch power supply IC or thick film or modular circuit design with standby function is disclosed, too. It comprises a standby power supply, a main power supply, a PFC device, and a supplemental circuit, wherein a remote control signal is transmitted to main control circuit in response to a main error signal to control main power supply. A method for preventing switch power current from overload and saturation is disclosed too. Finally, the present invention also provides a green power supply with standby function as well as its IC associated with digital processing highly qualified PFC, and a PC standard (such as ATX, ATX12, SSI) computer switch power supply.

Claims

1. A green switch-mode power supply with standby function, comprising:

a standby switched-mode power supply, comprising a standby converter circuit, a standby feedback circuit, and a standby control circuit; and

a main switched-mode power supply, comprising a main converter circuit, a main feedback circuit, and a main control circuit, wherein said main switched-mode power supply is subjected to a remote control signal to be on/off, wherein said main feedback circuit comprises a main sampling circuit, a main error amplifier, a main isolation circuit, and a remote control circuit, wherein said main control circuit comprises a main pulse adjustable circuit, a main driven circuit and a main switched-mode power supply prohibitive circuit; and

a supplemental circuit, comprising an initiating circuit, a rectifying filter circuit, wherein DC terminal of said standby switched-mode power supply, said standby control circuit, DC input terminal of said main switch-mode power supply and said main control circuit are common grounded; and

a monolithic green switched-mode power supply IC integrated with said standby control circuit, said main control circuit and said initiating circuit of said supplemental circuit, wherein said monolithic green switched-mode power supply IC is activated by said initiating circuit and is power-supplied by said standby switch-mode power supply,

wherein said remote control signal is sent to said main control circuit in response to a main error signal for controlling said main switch-mode power supply on/off, wherein when said remote control signal is an “

off”

signal, said remote control circuit force said main error signal being less than a predetermined threshold value, when said remote control signal is an “

on”

signal, said remote control circuit is deactivated, such that said main sampling circuit outputs a voltage signal to said main error amplifier to generate an optically coupled current through said main isolation circuit so as to output a main error signal;

wherein said main error signal is monitored by said main switched-mode power supply prohibitive circuit, when said main error signal is smaller than said threshold value, said remote control signal is assumed to be said “

off”

signal, such that said switched-mode power supply prohibitive circuit forces said main driven circuit to output a low electric level so as to switch off said main switch-mode power supply, and when said main error signal is not smaller than said threshold value, said remote control signal is assumed to be said “

on”

signal, that said main pulse adjustable circuit generates a main pulse in responsive to said main error signal, such that said main driven circuit is normally operating to switch on said main switch-mode power supply.

2. The green switch-mode power supply with standby function, as recited in claim 1, wherein an optical coupling is applied in said remote control circuit for sending said remote control signal to said main control circuit, wherein when said remote control signal is an “

off”

signal, said main switched-mode power supply prohibitive circuit forces said main driven circuit to output a low electric level so as to switch off said main switch-mode power supply, and when said remote control signal is an “

on”

signal, said main pulse adjustable circuit generates a main pulse in responsive to said main error signal, such that main driven circuit is normally operating to switch on said main switch-mode power supply.

3. The green switch-mode power supply IC with standby function, as recited in claim 2, wherein said standby control circuit further comprises a standby pulse adjustable circuit and a standby driven circuit, said standby pulse adjustable circuit generating a standby pulse signal in response to a standby error signal, wherein said main control circuit further comprises said main pulse adjustable circuit, said main driven circuit and said main switch-mode power supply prohibitive circuit;

wherein said remote control signal is sent to said main switched-mode power supply prohibitive circuit, when said remote control signal is an “

off”

signal, said main switched-mode power supply prohibitive circuit forces said main driven circuit to output a low electric level so as to switch off said main switch-mode power supply, and when said remote control signal is an “

on”

signal, said main pulse adjustable circuit generates a main pulse in responsive to said main error signal, such that main driven circuit is normally operating to switch on said main switch-mode power supply.

4. The green switch-mode power supply IC with standby function, as recited in claim 2, wherein said IC is further integrated with a PFC error amplifier and a PFC control circuit, wherein said PFC control circuit comprises a PFC pulse adjustable circuit and a PFC driven circuit.

5. The green switch-mode power supply IC with standby function, as recited in claim 3, wherein said IC is further integrated with a PFC error amplifier and a PFC control circuit, wherein said PFC control circuit comprises a PFC pulse adjustable circuit and a PFC driven circuit.