CN114844323A - Dual-loop standby control circuit and switching power supply - Google Patents

Dual-loop standby control circuit and switching power supply Download PDF

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Publication number
CN114844323A
CN114844323A CN202210596518.0A CN202210596518A CN114844323A CN 114844323 A CN114844323 A CN 114844323A CN 202210596518 A CN202210596518 A CN 202210596518A CN 114844323 A CN114844323 A CN 114844323A
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China
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voltage
port
resistor
switch
power supply
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CN202210596518.0A
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Chinese (zh)
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不公告发明人
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Shanghai Canrui Technology Co ltd
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Shanghai Canrui Technology Co ltd
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Priority to CN202210596518.0A priority Critical patent/CN114844323A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H02M1/0035—Control circuits allowing low power mode operation, e.g. in standby mode using burst mode control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a double-loop standby control circuit and a switching power supply, and relates to the field of electronics. The control circuit includes: the device comprises a first voltage division module, a second voltage division module, a first control module and a second control module; the input end of the first voltage division module is connected with the power port, converts the power voltage into an initial reference voltage and divides the initial reference voltage; the second voltage division module is connected with the power port and divides the power voltage to obtain a power divided voltage; the input end of the first control module is respectively connected with the output end of the first voltage division module, the output end of the second voltage division module and the setting enabling port; the output end of the first control module is connected with a power supply end enabling port; the first control module outputs a power port enabling signal; the second control module is respectively connected with the feedback port, the first voltage division module, the feedback end enabling port and the setting enabling port and outputs a feedback port enabling signal. The invention can meet the requirement of keeping the cycle skipping mode in standby.

Description

Dual-loop standby control circuit and switching power supply
Technical Field
The invention relates to the field of electronics, in particular to a dual-loop standby control circuit and a switching power supply.
Background
The power supply has been developed toward miniaturization, safety and high efficiency as a power supply device for portable electronic products, and therefore, products of small package SOT23-6L are in the market. However, as the energy efficiency standard increases, each house pursues standby functionsThe energy consumption is reduced, and a working mode of a standby skip cycle mode is adopted in ultra-small package SOT23-6L products to meet standby power consumption energy efficiency standards. In the ultra-small packaged SOT23-6L product, the control chip cannot be started at high voltage due to the limitation of pin position safety regulations, and the system can be powered on and started only by adopting an external resistor starting mode. When the resistor is adopted for starting, the power supply pin VDD is easy to be powered off during standby, so that automatic restart false operation is caused. Therefore, in order to prevent VDD from being powered down, VDD is usually powered down to the lower power threshold VDD for some advanced manufacturers OFF The control of the early exit skip cycle mode avoids power loss.
Disclosure of Invention
The invention aims to provide a dual-loop standby control circuit and a switching power supply, so as to meet the requirement of keeping a cycle skipping mode in a standby mode.
In order to achieve the purpose, the invention provides the following scheme:
a dual loop standby control circuit, the control circuit comprising: the device comprises a first voltage division module, a second voltage division module, a first control module and a second control module;
the input end of the first voltage division module is connected with a power supply port; the first voltage division module is used for converting a power supply voltage provided by a power supply port into an initial reference voltage and outputting the initial reference voltage, dividing the initial reference voltage and outputting a first reference voltage, a second reference voltage, a third reference voltage, a fourth reference voltage and a fifth reference voltage;
the second voltage division module is connected with a power supply port; the second voltage division module is used for dividing the power supply voltage to obtain a power supply divided voltage;
the first control module includes: a first comparator, a first inverter, a first switch and a second switch;
the first end of the first comparator is connected with the output end of the second voltage division module; a second end of the first comparator is respectively connected with the drain electrode of the first switch and the drain electrode of the second switch; the third end of the first comparator is connected with the input end of the first inverter; the third end of the first comparator is also connected with a power supply end enabling port to output a power supply port enabling signal;
the source electrode of the first switch is connected with the output end of the third reference voltage; the source electrode of the second switch is connected with the output end of the second reference voltage;
the fourth end of the first comparator is connected with the output end of the first reference voltage; a fifth end of the first comparator is connected with a set enable port;
the output end of the first reverser is connected with the grid electrode of the second switch; the source electrode of the second switch is connected with the output end of the second reference voltage; the grid of the first switch is connected with a power supply end enabling port;
the source electrode of the first switch is connected with the output end of the third reference voltage;
the second control module includes: a second comparator, a second inverter, a third switch, and a fourth switch;
the first end of the second comparator is connected with the feedback port;
a second end of the second comparator is connected with a drain electrode of the third switch and a drain electrode of the fourth switch respectively; the third end of the second comparator is connected with the input end of the second inverter; the third end of the second comparator is also connected with the feedback end enabling port to output a feedback port enabling signal;
a fifth end of the second comparator is connected with the set enable port; the fourth end of the second comparator is connected with the output end of the first reference voltage;
the source of the fourth switch is connected with the output end of the fourth reference voltage; the source of the third switch is connected with the output end of the fifth reference voltage; the grid electrode of the third switch is connected with the enabling port of the feedback end;
an output terminal of the second inverter is connected to a gate of the fourth switch.
Optionally, the first pressure splitting module comprises: the voltage device, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are connected in sequence;
the voltage transformer is connected with the power supply port; the voltage transformer is used for converting power voltage into initial reference voltage and dividing the initial reference voltage to obtain the first reference voltage;
the third resistor is connected with the voltage device and used for dividing the first reference voltage to obtain a second reference voltage;
the fourth resistor is connected with the third resistor and used for dividing the second reference voltage to obtain a third reference voltage;
the fifth resistor is connected with the fourth resistor, and the fifth resistor is used for dividing the third reference voltage to obtain the fourth reference voltage;
the sixth resistor is connected with the fifth resistor, and the sixth resistor is used for dividing the fourth reference voltage to obtain the fifth reference voltage;
one end of the seventh resistor is connected with the sixth resistor, and the other end of the seventh resistor is grounded.
Optionally, the second die separation module comprises: a first resistor and a second resistor;
one end of the first resistor is connected with the power supply port, and the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is grounded; and the connecting end between the first resistor and the second resistor is the output end of the second voltage division module.
A dual loop standby switching power supply, the switching power supply comprising: the device comprises a voltage input module, a feedback circuit module and a controller integrated circuit module; the controller integrated circuit module comprises a power-on and power-off enabling circuit, a driving circuit, a pulse modulator and the double-loop standby control circuit;
the input end of the voltage input module is connected with the voltage end of the input line, and the output end of the voltage input module is respectively connected with the power port and the input end of the feedback circuit module; the output end of the feedback circuit module is respectively connected with the feedback port and the current monitoring port;
the input end of the pulse modulator is respectively connected with the feedback port, the current monitoring port and the power supply port; the output end of the pulse modulator is connected with the driving circuit;
the input end of the power-up and power-down enabling circuit is connected with the power supply port; the output end of the power-on and power-off enabling circuit is connected with a setting enabling port;
the input end of the driving circuit is respectively connected with the power supply port, the feedback end enabling port and the power supply end enabling port; and the output end of the driving circuit is connected with the driving output port.
Optionally, the feedback circuit module includes: a voltage conversion submodule and a feedback device;
the input end of the voltage conversion submodule is connected with the output end of the voltage input module; the output end of the voltage conversion submodule is connected with the feedback device;
the output end of the feedback device is connected with the feedback port;
optionally, the feedback circuit module further includes: a power switch tube;
the drain electrode of the power switching tube is connected with the output end of the voltage input module through the primary side coil; the source electrode of the power switch tube is connected with the current monitoring port; and the grid electrode of the power switch tube is connected with the driving output port.
Optionally, the feedback circuit module further includes: a current limiting resistor;
one end of the current-limiting resistor is connected with the source electrode of the power switch tube, and the other end of the current-limiting resistor is grounded.
Optionally, the voltage conversion sub-module comprises: a transformer, a diode and a capacitor;
the transformer comprises a primary coil and a secondary coil; the primary side coil is respectively connected with the output end of the voltage input module and the drain electrode of the power switch tube; the secondary side coil is respectively connected with the anode of the diode and the capacitor; the cathode of the diode is connected to the capacitor.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
after the power supply voltage is divided by the first voltage dividing module and the second voltage dividing module, the first control module and the second control module are respectively connected with the first voltage dividing module and the second voltage dividing module to output a power supply port enabling signal and a feedback port enabling signal, and the second end of the first comparator can select the second reference voltage and the third reference voltage after the first reverser in the first control module reverses the power supply port enabling signal and controls the on-off state of the second switch; after the output signals of the drain of the third switch and the drain of the fourth switch are applied to the second comparator, the second end of the second comparator can select the fourth reference voltage and the fifth reference voltage; therefore, through the selective control of the input voltages of the first control module and the second control module, the stabilization of the output voltage and the operation of the jump cycle can be completed, so as to meet the requirement of keeping the jump cycle mode in a standby state.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a circuit diagram of a dual-loop standby control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a dual-loop standby switch power supply according to an embodiment of the present invention;
fig. 3 is a waveform diagram illustrating the switching from the heavy load to the idle standby of the dual-loop standby switch power supply according to the embodiment of the invention;
fig. 4 is a circuit diagram of a conventional switching power supply;
fig. 5 is a waveform diagram of heavy load switching to idle standby of a conventional switching power supply system;
fig. 6 is an operation waveform diagram of a conventional switching power supply system.
Description of the symbols:
the device comprises a first voltage division module-1, a second voltage division module-2, a first control module-3, a second control module-4, a voltage input module-5, a feedback circuit module-6 and a voltage conversion sub-module-7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a dual-loop standby control circuit and a switching power supply, wherein after a power supply voltage is divided by a first voltage dividing module and a second voltage dividing module, the first control module and the second control module are respectively connected with the first voltage dividing module and the second voltage dividing module, a power supply port enabling signal and a feedback port enabling signal are output, the switching state of a second switch is controlled after a first reverser in the first control module inverts the power supply port enabling signal, and after output signals of a drain electrode of the first switch and a drain electrode of the second switch act on a first comparator, the second end of the first comparator can select a second reference voltage and a third reference voltage; after the output signals of the drain of the third switch and the drain of the fourth switch are applied to the second comparator, the second end of the second comparator can select the fourth reference voltage and the fifth reference voltage; therefore, through the selective control of the input voltages of the first control module and the second control module, the stabilization of the output voltage and the operation of the jump cycle can be completed, so as to meet the requirement of keeping the jump cycle mode in a standby state.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The main reference symbols appearing in the embodiments of the present invention will be explained first:
10: conventional switching power supplies.
10A: the invention provides a dual-loop standby switch power supply.
11: conventional switching power supply controller integrated circuit modules.
11A: the invention relates to an integrated circuit module of a switching power supply controller.
12: a FeedBack (FeedBack); 20: a power up/down enable circuit (UVLO); 30: a Pulse Width Modulator (PWM); 40: a drive circuit (DRIVER); 50: 11 internal standby control circuit (STB).
50A: 11A, a dual ring standby control circuit (DLSTB).
60A: the timing waveform diagram for 2 instances of switching the heavy load of the switching power supply 10 to the light load.
60B: the timing waveform diagram for switching a heavy load of the switching power supply 10A to a light load.
STB Mode 1: the switching power supply 10 does not have a waveform that prevents heavy load switching to light load in the case of power down of the VDD port.
STB Mode 2: the switching power supply 10 is provided with a waveform that prevents heavy load switching to light load in the case of power down of the VDD port.
DLSTB Mode: the heavy load of the switching power supply 10A is switched to the timing waveform of the light load.
70: the operating waveform of the switching power supply 10.
M1: the first end of the power switch tube is a drain electrode, the second end is a grid electrode, and the third end is a source electrode.
TR: a transformer; lp: a primary coil of TR; ls: and the secondary winding of TR.
La: auxiliary winding of TR responsible for power supply to VDD portContainer C VDD And (5) supplying power.
D1: a full wave rectifier diode for AC input.
D2, D3: and the first end of the diode is a cathode, and the second end of the diode is an anode.
Rst: the starting resistance of the power supply 10 is switched.
R1, Rx, Rcs, R51, R52, R53, R54, R55, R56, R57: a resistor; wherein R51 is a first resistor, R52 is a second resistor, R53 is a third resistor, R54 is a fourth resistor, R55 is a fifth resistor, R56 is a sixth resistor, and R57 is a seventh resistor.
C1、Cx、C VDD C2: and a capacitor.
M50, M51, M52, M53: the first end of the N-type switch is a drain electrode, the second end of the N-type switch is a grid electrode, and the third end of the N-type switch is a source electrode; wherein M50 is a first switch, M51 is a second switch, M52 is a third switch, and M53 is a fourth switch.
51: the first comparator has a first end as a forward input end, a second end as a reverse input end and a third end as an output end, and the output end and the forward end have the same phase, namely the output is logic high when the voltage of the forward end is higher than that of the reverse end, otherwise, the output is logic low.
53: and the first end of the second comparator is a forward input end, the second end is a reverse input end, the third end is an output end, the output end and the forward end are in the same phase, namely the output is logic high when the voltage of the forward end is higher than that of the reverse end, otherwise, the output is logic low.
52: the output signal of the first inverter is the inverse of the input signal, i.e. the input is logic high and the output is logic low.
54: the output signal of the second inverter is the inverse of the input signal, i.e. the input is logic high and the output is logic low.
55: and a voltage transformer (VREF), wherein the input of the voltage transformer is a voltage signal, and the output of the voltage transformer is a reference voltage VREF.
VDD: a power port; FB: a feedback port; CS: a current monitoring port; DRV: a drive output port; GND: a ground port; VAC: the line voltage is input.
Vo: the dc output voltage of the switching power supply 10; ics: the primary winding of the transformer TR is current.
Vsw: a switching signal; v FB : a feedback voltage; v DD : power supply port voltage, i.e., supply voltage.
V PWM : a pulse width comparator output signal; EN: an enable signal output by the UVLO functional block.
vref: the second terminal voltage of the voltage transformer 55, i.e., the first reference voltage.
vref 1: a second reference voltage; vref 2: a third reference voltage; vref 3: a fourth reference voltage; vref 4: a fifth reference voltage.
V DD1 ：V DD I.e. the power supply divided voltage.
V STB_VDD ：V DD Outputs a logic enable signal, i.e., a power port enable signal.
V STB_VDD_N ：V STB_VDD The reverse direction signal of (1).
V STB_FB ：V FB Outputs a logic enable signal, i.e., a feedback port enable signal.
V STB_FB_N ：V STB_FB The reverse direction of (1); Δ Vo: the maximum ripple of the output voltage Vo; i is O : the secondary side outputs current; VDD hold2 : the VDD voltage remains off the threshold; VDD hold1 : the VDD voltage holds the threshold.
VDD OFF : a VDD voltage lower electrical threshold; VDD ON : the VDD voltage powers up the threshold.
V FB_OUT : a skip cycle mode exit voltage threshold; v FB_IN : the skip cycle mode enters a voltage threshold.
V FB_REF : the second terminal of the second comparator 53 receives the input voltage.
V VDD_REF : a second terminal of the first comparator 51 receives a voltage.
A cycle skipping mode: i.e. idle standby mode.
"1": logic high.
"0": logic low.
Example 1
As shown in fig. 1, the dual-loop standby control circuit provided in this embodiment includes: the device comprises a first voltage division module 1, a second voltage division module 2, a first control module 3 and a second control module 4.
The input end of the first voltage division module 1 is connected with a power supply port VDD; the first voltage dividing module 1 is used for dividing the power voltage V provided by the power port VDD DD Converts the voltage into an initial reference voltage and outputs the initial reference voltage, and divides the initial reference voltage to output a first reference voltage vref, a second reference voltage vref1, a third reference voltage vref2, a fourth reference voltage vref3, and a fifth reference voltage vref 4.
Specifically, the first voltage dividing module 1 includes: a voltage reference 55(VREF), a third resistor R53, a fourth resistor R54, a fifth resistor R55, a sixth resistor R56, and a seventh resistor R57; the voltage divider 55(VREF) is connected to the power supply port VDD; the voltage divider 55(VREF) is used to divide the supply voltage V DD Converting the voltage into a reference voltage, and dividing the reference voltage to obtain a first reference voltage vref; the third resistor R53 is connected to the voltage divider 55(VREF), and the third resistor R53 is used for dividing the first reference voltage VREF to obtain a second reference voltage VREF 1; the fourth resistor R54 is connected to the third resistor R53, and the fourth resistor R54 is configured to divide the second reference voltage vref1 to obtain a third reference voltage vref 2; the fifth resistor R55 is connected to the fourth resistor R54, and the fifth resistor R55 is configured to divide the third reference voltage vref2 to obtain a fourth reference voltage vref 3; the sixth resistor R56 is connected to the fifth resistor R55, and the sixth resistor R56 is configured to divide the fourth reference voltage vref3 to obtain a fifth reference voltage vref 4; the seventh resistor R57 is connected to the sixth resistor R56, and the other end thereof is grounded.
The second voltage division module 2 is connected with a power supply port VDD; the second voltage division module 2 is used for dividing the power supply voltage V DD Performing voltage division to obtain a power supply divided voltage V DD1 。
Specifically, the second voltage division module 2 includes a first resistor R51 and a second resistor R52; one end of the first resistor R51 is connected with the power supply port VDD, and the other end of the first resistor R51 is connected with one end of the second resistor R52; the other end of the second resistor R52 is grounded; the connection end between the first resistor R51 and the second resistor R52 is the output end of the second voltage division module 2.
The input end of the first control module 3 is respectively connected with the output end of the first voltage division module 1, the output end of the second voltage division module 2 and the setting enabling port; the output end of the first control module 3 is connected with a power supply end enabling port; the first control module 3 is used for dividing the voltage V at the power supply DD1 The first reference voltage vref, the second reference voltage vref1, the third reference voltage vref2 and the set enable port are used for outputting a power supply port enable signal V STB_VDD 。
Specifically, the first control module 3 includes: a first comparator 51, a first inverter 52, a first switch M50, and a second switch M51.
A first end of the first comparator 51 is connected with an output end of the second voltage division module 2; a second end of the first comparator 51 is connected with the drain of the first switch M50 and the drain of the second switch M51 respectively; the third end of the first comparator 51 is connected with the input end of the first inverter 52; the third terminal of the first comparator 51 is further connected to the power source terminal enable port to output the power source terminal enable signal V STB_VDD (ii) a The fourth end of the first comparator 51, the source of the first switch M50 and the source of the second switch M51 are all connected to the output end of the first voltage division module 1; the fourth terminal of the first comparator 51 is connected to the output of the first reference voltage vref; a fifth terminal of the first comparator 51 is connected to the set enable port; the output terminal of the first inverter 52 is connected to the gate of the second switch M51; the source of the second switch M51 is connected to the output of a second reference voltage vref 1; the gate of the first switch M50 is connected to the power supply terminal enable port; the source of the first switch M50 is connected to the output of a third reference voltage vref 2.
The second control module 4 is connected to the feedback port, the first voltage divider module 1, the feedback end enable port, and the set enable port, respectively, and the second control module 4 is configured to output a feedback port enable signal under the actions of the first reference voltage vref, the fourth reference voltage vref3, the fifth reference voltage vref4, and the set enable port.
Specifically, the second control module 4 includes: a second comparator 53, a second inverter 54, a third switch M52, and a fourth switch M53; first terminal and feedback port of second comparator 53FB connection; a second end of the second comparator 53 is connected to the drain of the third switch M52 and the drain of the fourth switch M53, respectively; the third terminal of the second comparator 53 is connected to the input terminal of the second inverter 54; the third terminal of the second comparator 53 is further connected to the feedback terminal enable port to output the feedback port enable signal V STB_FB (ii) a The fifth terminal of the second comparator 53 is connected to the set enable port; the fourth terminal of the second comparator 53 is connected to the port of the first voltage division module 1 that outputs the first reference voltage vref.
The source of the fourth switch M53 is connected to the port of the first voltage divider module 1 outputting the fourth reference voltage vref 3; the source of the third switch M52 is connected to the port of the first voltage divider module 1 outputting the fifth reference voltage vref 4; the gate of the third switch M52 is connected to the feedback terminal enable port; the output terminal of the second inverter 54 is connected to the gate of the fourth switch M53.
The dual-loop standby control circuit provided by the embodiment is composed of resistors R51, R52, R53, R54, R55, R56 and R57, wherein R51 is a first resistor, R52 is a second resistor, R53 is a third resistor, R54 is a fourth resistor, R55 is a fifth resistor, R56 is a sixth resistor, and R57 is a seventh resistor; the voltage transformer 55, the first comparator 51, the second comparator 53, the first inverter 52, the second inverter 54, the switches M50, M51, the switch M52 and the switch M53 are electrically connected; wherein M50 is a first switch, M51 is a second switch, M52 is a third switch, and M53 is a fourth switch; the control circuit can be connected to the VDD port, i.e., the power port, V FB The port feeds back the dual-loop standby control of the port, so that the dual-loop standby control meets the standby energy efficiency and avoids the problem of oscillation when heavy load is switched to no-load standby, the safety of the user electric equipment is guaranteed, the efficiency of the user electric equipment is improved, and the dual-loop standby control has a high market application prospect.
The operating principle of the dual-ring standby control circuit 50A provided in this embodiment is as follows:
when VDD is powered on from 0 DD <VDD ON Time (VDD) ON Power-on threshold), EN is logic "0", the outputs of all comparators are set to logic "1", when V is DD >VDD ON The back circuit enters normal operationThe mode is made. Voltage V at VDD terminal DD The first reference voltage vref is output after being input to the voltage device 55, and further, V DD Voltage division is carried out by a first resistor R51 and a second resistor R52 to obtain a voltage detection signal V DD1 ，V DD1 To a first terminal of the first comparator 51. The first reference voltage vref is divided by a series resistor, i.e., a fourth resistor R54, a fifth resistor R55, a sixth resistor R56 and a seventh resistor R57, to generate a second reference voltage vref1, a third reference voltage vref2, a fourth reference voltage vref3 and a fifth reference voltage vref4, respectively. The first switch M50 and the second switch M51 are the second terminal input signal V of the first comparator 51 VDD_REF A second reference voltage vref1 and a third reference voltage vref2, and a third switch M52 and a fourth switch M53 are second-terminal input signals V of the second comparator 53 FB_REF Selection switches for the fourth reference voltage vref3 and the fifth reference voltage vref 4. The first inverter 52 inverts the output logic of the first comparator 51, and then controls the second switch M51 to be turned on and off. The second inverter 54 inverts the output logic of the second comparator 53 to control the fourth switch M53 to be turned on and off.
The first resistor R51 and the second resistor R52 are matched to have a proportionality coefficient of beta (0)<β<1) The third resistor R53, the fourth resistor R54, the fifth resistor R55, the sixth resistor R56 and the seventh resistor R57 are matched with each other, and the proportionality coefficient is theta 1 、θ 2 、θ 3 、θ 4 Is precisely resistance (0)<θ 4 <θ 3 <θ 2 <θ 1 <1)。
R52＝β(R51+R52)。
R57＝θ 4 (R53+R54+R55+R56+R57)。
R56+R57＝θ 3 (R53+R54+R55+R56+R57)。
R55+R56+R57＝θ 2 (R53+R54+R55+R56+R57)。
R54+R55+R56+R57＝θ 1 (R53+R54+R55+R56+R57)。
Vref1＝θ 1 ×vref。
Vref2＝θ 2 ×vref。
Vref3＝θ 3 ×vref。
Vref4＝θ 4 ×vref。
V DD1 ＝β×VDD。
Although there are many embodiments for solving the power-down phenomenon in the prior art and can also help customers to easily design the switching power supply system, in the prior art, when heavy load is switched to no-load, the switching power supply system works in a non-skip cycle mode to greatly increase switching loss, and the standby power consumption energy efficiency standard cannot be met. Therefore, special technologies are needed to avoid the above problems and meet the energy efficiency standard, so as to achieve the safety and high efficiency of protecting the electric equipment.
The circuit diagram of the conventional switching power supply is shown in fig. 4, and the operating waveform of the conventional switching power supply is shown in fig. 6. After the output voltage Vo of the secondary side of the transformer TR is sampled by the feedback device 12 and transmitted to the FB port of the power converter 11, the current Ics in the primary side coil of the transformer is sampled to the power converter 11 by the power switch transistor M1 and the current limiting resistor Rcs, that is, the current Ics reaches the CS port of the conventional switching power controller integrated circuit module, so as to generate a square wave signal (Vsw) with a variable pulse width to control the on and off of the power switch transistor (M1), thereby completing the transmission of energy of the transformer TR. Because the conventional switching power supply 10 is started by a resistor, in order to achieve the energy efficiency standard of standby power consumption, the standby working mode adopts a skip cycle mode, and one of the disadvantages is that when a heavy load is switched to a no-load standby mode, the output end Vo of the switching power supply system is easy to vibrate due to power failure of a VDD port; the other disadvantage is that if the power-down prevention technology is added, when the heavy load is switched to the idle-load standby mode, the standby power consumption exceeds the standard due to the fact that the standby power consumption is caused by the fact that the standby power consumption is caused to be greatly consumed when the non-skip cycle mode is operated. As shown in fig. 5, STB Mode1 is the case of one of the disadvantages, and STB Mode2 is the case of the second of the disadvantages. Therefore, special technologies are needed to avoid the above problems and meet the energy efficiency standard, so as to achieve the safety and high efficiency of protecting the electric equipment.
Therefore, the invention further provides a switching power supply based on the control circuit in embodiment 1 of the invention, so as to realize the safety and high efficiency of the electric equipment, which is detailed in embodiment 2.
Example 2
As shown in fig. 2, the dual-loop standby switch power supply provided in the embodiment of the present invention includes: a voltage input module 5, a feedback circuit module 6 and a controller integrated circuit module 11A; the controller integrated circuit module 11A includes the power-up/down enable circuit 20, the drive circuit 40, the pulse modulator 30, and the dual-loop standby control circuit in embodiment 1.
The input end of the voltage input module 5 is connected with the voltage end of the input line (namely the port of VAC), and the output end of the voltage input module is respectively connected with the power supply port VDD and the input end of the feedback circuit module 6; the output end of the feedback circuit module 6 is connected with the feedback port FB and the current monitoring port CS respectively.
The feedback circuit module 6 is used for obtaining direct current output voltage under the action of the voltage input module 5; the feedback circuit module 6 feeds back the direct current output voltage to the feedback port FB, and the voltage fed back to the feedback port FB at the moment is used as a feedback voltage; the feedback circuit module 6 is also used for outputting the primary coil current.
The input end of the pulse modulator 30 is connected to the feedback port FB, the current monitoring port CS and the power supply port VDD; the output of the pulse modulator 30 is connected to a drive circuit 40.
The pulse modulator 30 is used for the feedback circuit block 6, i.e. the primary coil current, the feedback voltage and the supply voltage V DD Outputs the switching signal Vsw.
The input end of the power-up and power-down enabling circuit 20 is connected with a power supply port VDD; the output end of the power-on/power-off enabling circuit 20 is connected with an EN port of a setting enabling port; the power-up/power-down enable circuit 20 is used for receiving a power supply voltage V DD And outputs an enable signal EN; the output end of the power-up and power-down enabling circuit 20 is connected with a set enabling port; the enable signal EN is used to initially set the control circuit.
The input end of the driving circuit 40 is respectively connected with the power supply port VDD, the feedback end enable port and the power supply end enable port; the output terminal of the drive circuit 40 is connected to the drive output port DRV. The drive circuit 40 is arranged to be at a supply voltage V DD And a power supply port enable signal V STB_VDD And a feedback port enable signal V STB_FB Outputs a load driving signal, and is output from the driving output port DRV, and the driving circuit 40 is further configured to adjust the pulse width of the feedback circuit module 6 according to the switching signal Vsw. In one embodiment, the feedback circuit module 6 specifically includes a voltage conversion submodule 7 and a feedback 12; the input end of the voltage conversion submodule 7 is connected with the output end of the voltage input module 5; the output of the voltage conversion submodule 7 is connected to a feedback 12.
Specifically, the voltage conversion submodule 7 includes: a transformer TR, a diode D3, and a capacitor C2; the transformer TR comprises a primary coil LP and a secondary coil LS; the primary winding LP is connected with the output end of the voltage input module 5 and is connected with the drain electrode of the power switch tube M1; the secondary winding LS is connected to the anode of the diode D3 and to the capacitor C2; the cathode of the diode D3 is also connected to the capacitor C2. The voltage conversion submodule 7 is used for converting the voltage output by the output end of the voltage input module 5 to obtain an output voltage V 0 (ii) a The output end of the feedback device 12 is connected with the feedback port FB; the feedback device 12 is used for the output voltage V 0 The selection sampling is performed and transmitted to the feedback port FB.
As an optional implementation, the feedback circuit module 6 further includes: a power switch tube M1; the drain electrode of the power switch tube M1 is connected with the output end of the voltage input module 5 through the primary coil LP; the source electrode of the power switch tube M1 is connected with the current monitoring port CS; the gate of the power switch M1 is connected to the drive output port DRV.
The square wave signal Vsw controls the power switch M1 to turn on and off to complete the transfer of energy to the transformer TR.
Further, the feedback circuit module 6 further includes: a current limiting resistor Rcs; the current limiting resistor Rcs is connected to the source of the power switch M1, and the other end is grounded.
The UVLO, DRIVER, PWM and double-ring standby control circuit is embedded in a switch power supply controller integrated circuit module 11A, and a VDD port, namely a power supply port, of the double-ring standby control circuit is connected with a power supply VDD of the switch power supply controller integrated circuit module 11A; EN port of double-ring standby control circuit is connected with switching power supply controllerUVLO output EN of integrated circuit 11A; v of double-ring standby control circuit STB_VDD The port is connected with the DRIVER third input end V of the switch power supply controller integrated circuit module 11A STB_VDD (ii) a V of double-ring standby control circuit STB_FB Second input end V of DRIVER of integrated circuit module 11A of port connection switching power supply controller STB_FB (ii) a V of double-ring standby control circuit FB The port is connected to an input terminal FB of the switching power supply controller integrated circuit 11A and a second input terminal FB of the PWM. The switching power supply controller integrated circuit module 11A comprises a DLSTB, a UVLO, a PWM and a DRIVER, a first input terminal CS of the PWM is connected to a first terminal of the sampling resistor Rcs and a source electrode of the power switch M1, a second input terminal FB of the PWM is connected to an output terminal of the feedback 12, and an output terminal of the PWM is connected to a first input terminal of the driving circuit DRIVER; the second end of the sampling resistor Rcs is grounded; the input end of the UVLO is connected with a power supply VDD port of the switching power supply controller integrated circuit module 11A, a first end of the DLSTB, a third input end of the PWM and a fourth end of the DRIVER; the output end DRV of the drive circuit DRIVER is externally connected with the grid electrode of the power switch tube M1; the drain electrode of the power switch tube M1 is connected with the primary coil Lp of the transformer.
The switching power supply controller integrated circuit module 11A is coupled to a feedback 12 provided at an output terminal of the transformer TR to generate a switching signal V SW The pulse width of the transformer TR is adjusted through the power switch tube M1, so that the energy transmission of the switching power supply 10A is regulated; the switching power supply controller integrated circuit module 11A is formed by coupling a dual-ring standby control circuit 50A, an up-down power enable circuit 20, a pulse width modulator 30 and a driving circuit 40. The dual-ring standby control circuit 50A, the power-up/power-down enable circuit 20, the pulse width modulator 30 and the driving circuit 40 are embedded in the controller integrated circuit module 11A to save external devices.
In addition, there is also an example of the switching power supply: the switch power supply is a secondary side feedback mode power supply system; namely, the dual-loop control circuit can be applied to a secondary side feedback type switch power supply.
Therefore, the switching power supply 10A provided in embodiment 2 is a system with a heavy load, and the input voltage V at the VDD terminal is applied DD At a high potential, V DD1 Much larger than vref1 and vref2, the output V of the first comparator 51 STB_VDD Logic "1", signal V after passing through the first inverter 52 STB_VDD_N Is logic "0", V STB_VDD 、V STB_VDD_N The first switch M50 and the second switch M51 are controlled to be turned off respectively, so that the first comparator 51 inputs a voltage threshold value:
V VDD_REF ＝vref2＝θ 2 ×vref。
under heavy load, the output V of the feedback device 12 FB A high voltage, far exceeding the fourth reference voltage vref3 and vref4 the fifth reference voltage, resulting in V FB After passing through a second comparator 53, the output signal V STB_FB Logic "1", signal V after passing through the second inverter 54 STB_FB_N Is logic "0", V STB_FB 、V STB_FB_N The third switch M52 and the fourth switch M53 are controlled to be turned on and off, respectively, so that the second comparator 53 inputs the voltage threshold value:
V FB_REF ＝V FB_IN ＝vref4＝θ 4 ×vref。
when the system, i.e., the switching power supply 10A, switches from a heavy load to a no-load, the output V of the feedback 12 FB The signal voltage changes from high to low when V FB Below V FB_REF ＝V FB_IN ＝θ 4 After x vref, the second comparator 53 outputs V STB_FB Is inverted to "0", and the signal V is passed through the second inverter 54 STB_FB_N Is logic "1", signal V STB_FB 、V STB_FB_N The third switch M52 and the fourth switch M53 are controlled to be turned off and on respectively, so that the second comparator 53 inputs a voltage threshold V FB_REF ＝V FB_OUT ＝vref3＝θ 3 X vref. V with logic "0 STB_FB Vsw is turned off, that is to say V FB Below V FB_IN Then the driving signal Vsw is turned off and the system enters a skip cycle mode and causes the VDD voltage to drop. When the VDD voltage drops below VDD hold1 When it is V DD1 Drop below vref 2:
V DD1 ＝β×V DD <V VDD_REF ＝vref2＝θ 2 ×vref。
VDD hold1 ＝θ 2 ×vref/β。
V DD <VDD hold1 。
V DD1 after being compared by the first comparator 51, the output signal V STB_VDD The initial logic "1" after the VDD is powered up is turned to logic "0", the switching power supply 10A is controlled to forcibly exit the skip cycle mode, and the driving signal Vsw resumes the switching action. Here, V STB_VDD Control priority to resume Vsw switching is higher than V STB_FB But V is STB_VDD Does not change V STB_FB So that it can be seen that the skip cycle mode (i.e. idle standby) control is a dual loop standby control, where the dual loops are each V DD →V DD1 →V STB_VDD Loop sum V o →V FB →V STB_FB And (3) a loop. Results V STB_VDD ＝“0”，V STB_VDD_N When "1", the second switch M51 is on, the first switch M50 is off, and V is off VDD_REF ＝vref1＝θ 1 ×vref。
VDD starts to rise after the driving signal Vsw is recovered, and when the voltage of VDD is larger than VDD hold2 When it is V DD1 There are times when the rise is greater than vref1,
V DD1 ＝β×V DD >V VDD_REF ＝vref1＝θ 1 ×vref。
VDD hold2 ＝θ 1 ×vref/β。
V DD >VDD hold2 。
V DD1 after being compared by the first comparator 51, the output signal V STB_VDD The logic '0' is inverted to the logic '1', and the skip cycle mode control power of the switching power supply 10A is given to V FB And then V is FB Is still lower than V FB_OUT Then V STB_FB Is a logical "0", V STB_FB The driving signal Vsw is turned off. V STB_VDD 1, then V STB_VDD_N When "0", the second switch M51 is off, the first switch M50 is on, and V is off VDD_REF ＝vref2＝θ 2 ×vref。
Turning off the driving signal Vsw causes the VDD voltage to drop, when the VDD voltage drops below VDD hold1 When it is V DD1 When the voltage drops below vref2, the VDD control process is repeated, resulting in VDD being at VDD hold1 、VDD hold2 Periodically fluctuating until V FB Rises above V FB_OUT ＝V FB_REF ＝vref3＝θ 3 X vref, then V STB_FB ＝“1”。
If at this time V STB_VDD When the value is equal to "0", then V STB_VDD Forcibly restoring the Vsw switch; if V STB_VDD If "1", control is given to V STB_FB Then V STB_FB Vsw switching operation resumes at "1". Therefore, no matter what state VDD is, once V STB_FB If Vsw returns to switching operation at "1", VDD will be at V STB_FB The period of 1 continues to rise.
The above is a complete working process of the switching power supply based on the dual-loop standby control circuit, and the timing waveform of the switching power supply is shown in fig. 3. The switching power supply 10A including the dual-loop standby control circuit realizes both safety and wide temperature operation consistency, and also realizes minimization of standby power consumption.
Fig. 3 and 5 show a waveform ratio of the switching power supply 10A according to the present invention to a waveform ratio of the conventional switching power supply 10 when the output load is switched from a heavy load to a no-load.
As can be seen from the waveforms of fig. 5, the waveforms of the conventional switching power supply 10 are two examples when the output load is switched from heavy load to no load. One example of the STB Mode1 is the waveform of a conventional switching power supply system 10 without VDD Power loss prevention techniques, and the results show that VDD is powered down (i.e., VDD) after the output load is switched from heavy load to no load<VDD OFF ) And the VDD is automatically restarted, and the oscillation of the output voltage Vo exceeds the maximum ripple delta Vo requirement of Vo. The second STB Mode2 of the example is the waveform of the conventional switching power supply system 10 with the technology of preventing VDD from power down, and the result shows that after the output load is switched from heavy load to no load, VDD is stable and no power down occurs, the output voltage Vo is stable and normal, but the Vsw waveform continues to perform switching action all the time, so that severe switching loss is generated, and as a result, the standby power consumption of the switching power supply system exceeds the energy efficiency specification range and cannot meet the standby power consumption index requirement.
As can be seen from the waveforms in fig. 3, the switching power supply 10A according to embodiment 2 of the present invention switches from heavy load to heavy load at the output loadWhen it is changed to no-load, because of V DD And V FB The result shows V DD No power down (i.e. V) occurs during heavy and no-load switching DD <VDD OFF ) And the ripple of the output voltage Vo is also within the maximum ripple delta Vo, thereby meeting the requirement of power supply specification. Meanwhile, the actions of the Vsw are to turn off for a long time and then turn on a plurality of pulses, and then turn off for a long time and then turn on a plurality of pulses, and the cycle is repeated to jump the cycle work, so that the total switching loss in unit time is greatly reduced, and as a result, the switching loss of the system is greatly reduced in no-load standby, and the no-load standby power consumption index can easily meet the energy efficiency standby power consumption index requirement.
The switching power supply provided by the embodiment of the invention has the following advantages:
the embodiment of the invention can be applied to a secondary side feedback type switch power supply system and a primary side feedback type switch power supply system, the switch power supply system applying the embodiment of the invention has safety, low standby power consumption and the like which are obviously superior to other switch power supply systems, the cost can be saved for users, and the design difficulty of the switch power supply system is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A dual-loop standby control circuit, the control circuit comprising: the device comprises a first voltage division module, a second voltage division module, a first control module and a second control module;
the input end of the first voltage division module is connected with a power supply port; the first voltage division module is used for converting a power supply voltage provided by a power supply port into an initial reference voltage and outputting the initial reference voltage, dividing the initial reference voltage and outputting a first reference voltage, a second reference voltage, a third reference voltage, a fourth reference voltage and a fifth reference voltage;
the second voltage division module is connected with a power supply port; the second voltage division module is used for dividing the power supply voltage to obtain a power supply divided voltage;
the first control module includes: a first comparator, a first inverter, a first switch and a second switch;
the first end of the first comparator is connected with the output end of the second voltage division module; a second end of the first comparator is respectively connected with the drain electrode of the first switch and the drain electrode of the second switch; the third end of the first comparator is connected with the input end of the first inverter; the third end of the first comparator is also connected with a power supply end enabling port to output a power supply port enabling signal;
the source electrode of the first switch is connected with the output end of the third reference voltage; the source electrode of the second switch is connected with the output end of the second reference voltage;
the fourth end of the first comparator is connected with the output end of the first reference voltage; a fifth end of the first comparator is connected with a set enable port;
the output end of the first reverser is connected with the grid electrode of the second switch; the source electrode of the second switch is connected with the output end of the second reference voltage; the grid of the first switch is connected with a power supply end enabling port;
the source electrode of the first switch is connected with the output end of the third reference voltage;
the second control module includes: a second comparator, a second inverter, a third switch, and a fourth switch;
the first end of the second comparator is connected with the feedback port;
a second end of the second comparator is connected with a drain electrode of the third switch and a drain electrode of the fourth switch respectively; the third end of the second comparator is connected with the input end of the second inverter; the third end of the second comparator is also connected with the feedback end enabling port to output a feedback port enabling signal;
a fifth end of the second comparator is connected with the set enable port; the fourth end of the second comparator is connected with the output end of the first reference voltage;
the source of the fourth switch is connected with the output end of the fourth reference voltage; the source of the third switch is connected with the output end of the fifth reference voltage; the grid electrode of the third switch is connected with the enabling port of the feedback end;
an output terminal of the second inverter is connected to a gate of the fourth switch.
2. The dual loop standby control circuit of claim 1, wherein the first voltage division module comprises: the voltage device, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are connected in sequence;
the voltage transformer is connected with the power supply port; the voltage transformer is used for converting power voltage into initial reference voltage and dividing the initial reference voltage to obtain the first reference voltage;
the third resistor is connected with the voltage device and used for dividing the first reference voltage to obtain a second reference voltage;
the fourth resistor is connected with the third resistor and used for dividing the second reference voltage to obtain a third reference voltage;
the fifth resistor is connected with the fourth resistor, and the fifth resistor is used for dividing the third reference voltage to obtain the fourth reference voltage;
the sixth resistor is connected with the fifth resistor, and the sixth resistor is used for dividing the fourth reference voltage to obtain the fifth reference voltage;
one end of the seventh resistor is connected with the sixth resistor, and the other end of the seventh resistor is grounded.
3. The dual loop standby control circuit of claim 1, wherein the second voltage division module comprises: a first resistor and a second resistor;
one end of the first resistor is connected with the power supply port, and the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is grounded; and the connecting end between the first resistor and the second resistor is the output end of the second voltage division module.
4. A dual-loop standby switch power supply, the switch power supply comprising: the device comprises a voltage input module, a feedback circuit module and a controller integrated circuit module; the controller integrated circuit module comprises a power-up and power-down enabling circuit, a driving circuit, a pulse modulator and a double-loop standby control circuit as claimed in any one of claims 1 to 3;
the input end of the voltage input module is connected with the voltage end of the input line, and the output end of the voltage input module is respectively connected with the power supply port and the input end of the feedback circuit module; the output end of the feedback circuit module is respectively connected with the feedback port and the current monitoring port;
the input end of the pulse modulator is respectively connected with the feedback port, the current monitoring port and the power supply port; the output end of the pulse modulator is connected with the driving circuit;
the input end of the power-up and power-down enabling circuit is connected with the power supply port; the output end of the power-on and power-off enabling circuit is connected with a setting enabling port;
the input end of the driving circuit is respectively connected with the power supply port, the feedback end enabling port and the power supply end enabling port; and the output end of the driving circuit is connected with the driving output port.
5. A dual loop standby switch power supply as claimed in claim 4, wherein said feedback circuit module comprises: a voltage conversion submodule and a feedback device;
the input end of the voltage conversion submodule is connected with the output end of the voltage input module; the output end of the voltage conversion submodule is connected with the feedback device;
and the output end of the feedback device is connected with the feedback port.
6. The dual loop standby switch power supply of claim 5, wherein said feedback circuit module further comprises: a power switch tube;
the drain electrode of the power switching tube is connected with the output end of the voltage input module through the primary side coil; the source electrode of the power switch tube is connected with the current monitoring port; and the grid electrode of the power switch tube is connected with the driving output port.
7. The dual loop standby switch power supply of claim 6, wherein said feedback circuit module further comprises: a current limiting resistor;
one end of the current-limiting resistor is connected with the source electrode of the power switch tube, and the other end of the current-limiting resistor is grounded.
8. The dual loop standby switch power supply of claim 6, wherein said voltage conversion sub-module comprises: a transformer, a diode and a capacitor;
the transformer comprises a primary coil and a secondary coil; the primary side coil is respectively connected with the output end of the voltage input module and the drain electrode of the power switch tube; the secondary side coil is respectively connected with the anode of the diode and the capacitor; the cathode of the diode is connected to the capacitor.
CN202210596518.0A 2022-05-30 2022-05-30 Dual-loop standby control circuit and switching power supply Pending CN114844323A (en)

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