CN111082640A - Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit - Google Patents

Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit Download PDF

Info

Publication number
CN111082640A
CN111082640A CN201911280531.XA CN201911280531A CN111082640A CN 111082640 A CN111082640 A CN 111082640A CN 201911280531 A CN201911280531 A CN 201911280531A CN 111082640 A CN111082640 A CN 111082640A
Authority
CN
China
Prior art keywords
power supply
resistor
winding
diode
energy storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911280531.XA
Other languages
Chinese (zh)
Other versions
CN111082640B (en
Inventor
潘桂凯
罗皓
宋建峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mornsun Guangzhou Science and Technology Ltd
Original Assignee
Mornsun Guangzhou Science and Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mornsun Guangzhou Science and Technology Ltd filed Critical Mornsun Guangzhou Science and Technology Ltd
Priority to CN201911280531.XA priority Critical patent/CN111082640B/en
Publication of CN111082640A publication Critical patent/CN111082640A/en
Application granted granted Critical
Publication of CN111082640B publication Critical patent/CN111082640B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—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

Landscapes

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

Abstract

The invention discloses a forward and backward excitation auxiliary power supply circuit which comprises a flyback power supply module, a forward power supply module and a sampling module and can be applied to a KNX bus power supply and a circuit with a short-circuit constant current requirement or an extremely low voltage output requirement. The invention can realize that: when the power supply works in a stable state, the flyback power supply module supplies power to the main control IC and the feedback loop; and during short circuit, the auxiliary power supply is switched to the forward power supply module to supply power to the main control IC and the feedback loop, so that the normal work of the IC and the feedback loop is ensured. The circuit can also realize the short-circuit constant current function. The invention also discloses a forward and reverse power supply circuit which has the same principle as the forward and reverse auxiliary power supply circuit. The invention ensures lower no-load power consumption and higher overall efficiency under high-low voltage input.

Description

Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit
Technical Field
The invention relates to the field of switching power supplies, in particular to a forward and backward excitation auxiliary power supply circuit and a forward and backward excitation power supply circuit.
Background
In the field of switching power supplies, flyback topology and its expanded topology are very popular and practical. The development of the flyback topology has very important significance for upgrading products.
In the application design of the switching power supply, the main control IC is generally supplied with power by an auxiliary winding, and the auxiliary power supply circuit generally adopts a flyback winding power supply circuit or a forward winding power supply circuit.
The flyback winding has a simple power supply circuit, can ensure the consistency of no-load power consumption under high and low voltages, and has the defect that the protection functions such as short-circuit constant current cannot be realized. The forward winding power supply circuit generally needs to be added with a linear voltage stabilizing circuit to ensure the stability of the IC power supply voltage under high-low voltage input, and the circuit has the defects that the linear voltage stabilizing circuit has very large loss under high voltage and has the advantage of continuously supplying power to the IC to realize the short-circuit constant current protection function in the case of short circuit.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a forward and reverse excitation auxiliary power supply circuit, which can ensure lower standby power consumption, simultaneously improve the overall working efficiency and realize the short-circuit constant current function for the products with short-circuit constant current protection requirements, low standby power consumption requirements and high working efficiency requirements.
In order to solve the problems, a forward and reverse auxiliary power supply circuit is designed, when a power supply is stable, auxiliary power supply is realized through a flyback winding, and when a short circuit occurs, auxiliary power supply can be switched from the flyback winding to the forward winding. Compared with forward winding power supply, flyback winding power supply ensures that the switching power supply has smaller standby power consumption, and the working efficiency of the whole machine is improved, and forward winding power supply can ensure that the short-circuit constant current function can be realized when the switching power supply outputs a short circuit. The purposes of realizing the short-circuit constant-current function and simultaneously ensuring lower standby power consumption and higher overall machine working efficiency under the high-low voltage input condition are achieved by switching the auxiliary power supply circuit.
The general inventive concept of the application is: the sampling circuit is designed to sample the voltage of the flyback power supply module to control the forward power supply module to work, when the power supply works in a stable state, the sampling circuit controls the forward power supply circuit to work, only the flyback power supply circuit works, when the power supply output is short-circuited, the sampling circuit controls the forward power supply circuit to work, the flyback power supply module is switched to the forward power supply module to remove auxiliary power supply, and the IC and the current feedback loop can work normally.
The invention is realized by the following technical scheme:
the utility model provides a positive and negative excitation auxiliary power supply circuit for to switching power supply auxiliary power supply which characterized in that: the device comprises a flyback energy storage module, a forward energy storage module, a switch module, a sampling module, a first winding, a second winding and a diode;
the first winding and the second winding are arranged on the primary side of the switching power supply, and one end of the first winding, one end of the second winding and one end of the primary side winding of the switching power supply are homonymous ends; the cathode of the diode and the power supply end of the switch module are both connected with a power supply VCC, the anode of the diode is connected with the input end of the flyback energy storage module, the output end of the flyback energy storage module is connected with one end of the first winding, the sampling output end of the flyback energy storage module is connected with the sampling input end of the sampling module, the output end of the sampling module is connected with the input end of the switch module, the controlled end of the forward energy storage module is connected with the control end of the switch module, the output end of the forward energy storage module is connected with the other end of the second winding, and the other end of the first winding is grounded with one end;
the sampling module samples the voltage of the flyback energy storage module, outputs a first sampling signal to the switch module, and controls the working state of the switch module, so that the realization is realized: when the sampling signal is higher than a first set value, the switch module does not work, and the flyback energy storage module supplies power to an IC (integrated circuit) of the switch power supply; when the sampling signal is lower than the first set value, the switch module works, and the forward energy storage module supplies power to the IC of the switch power supply.
As a specific embodiment of the flyback energy storage module, the flyback energy storage module includes a diode D1 and a capacitor C1, an anode of the diode D1 is connected to one end of the first winding, a cathode of the diode D1 is connected to one end of the capacitor C1 and an anode of the diode D2, and the other end of the capacitor C1 is grounded.
As a specific embodiment of the sampling module, the sampling module includes a resistor R2, a resistor R3, a resistor R4, and a MOS transistor Q1, one end of the resistor R2 is connected to the cathode of the diode D1, the other end of the resistor R2 is connected to one end of the resistor R3 and the gate of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to one end of the resistor R4, and the other end of the resistor R3 and the source of the MOS transistor Q1 are grounded.
As a specific embodiment of the switch module, the switch module includes a transistor Q5 and a zener diode ZD1, an emitter of the transistor Q5 is connected to the power supply VCC, a collector of the transistor Q5 is connected to the other end of the resistor R4, a base of the transistor Q5 is connected to a cathode of the zener diode ZD1 and a drain of the MOS transistor Q1, and an anode of the zener diode ZD1 is grounded.
As another specific embodiment of the switch module, the switch module includes a resistor R5, a MOS transistor Q2, a transistor Q5, and a zener diode ZD1, an emitter of the transistor Q5 is connected to the power supply VCC, a collector of the transistor Q5 is connected to one end of the resistor R5 and the other end of the resistor R4, a base of the transistor Q5 is connected to a cathode of the zener diode ZD1 and a source of the MOS transistor Q2, the other end of the resistor R5 is connected to a drain of the MOS transistor Q2, a gate of the MOS transistor Q2 is connected to a drain of the MOS transistor Q1, and an anode of the zener diode ZD1 is grounded.
As a specific embodiment of the forward energy storage module, the forward energy storage module includes a diode D3 and a capacitor C2, an anode of the diode D3 is connected to the other end of the second winding, a cathode of the diode D3 is connected to a connection point between the other end of the resistor R4 and a collector of the transistor Q5 and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
Preferably, the switch module is a mechanical switch or an electronic switch.
The invention also provides a forward and backward excitation power supply circuit, which has the following implementation scheme:
a forward and backward excitation power supply circuit comprises the forward and backward excitation auxiliary power supply circuit, a second flyback energy storage module, a second forward excitation energy storage module, a second sampling module, a second switch module, a third winding and a fourth winding, wherein the third winding and the fourth winding are arranged on the secondary side of a switch power supply, and one end of the third winding, one end of the fourth winding and one end of the secondary winding of the switch power supply are the same-name ends;
the input end of the second flyback energy storage module is connected with one end of the third winding, the output end of the second flyback energy storage module is connected with the voltage VIC, the input end of the second forward energy storage module is connected with the other end of the fourth winding, the sampling output end of the second forward energy storage module is connected with the sampling input end of the second sampling module, the input end of the second switch module is connected with the output end of the second sampling module, the output end of the second switch module is connected with the voltage VIC, and the other end of the third winding is grounded with one end of the fourth winding;
the second way of sampling module samples the voltage of the forward energy storage module, outputs a second sampling signal to the second way of switch module, and controls the working state of the second way of switch module, thereby realizing: when the sampling voltage is higher than a second set value, the second switch module does not work, and the second flyback energy storage module supplies power to a feedback loop of the switch power supply; when the second sampling signal is lower than a second set value, the second switch module works, and the second forward energy storage module supplies power to a feedback loop of the switch power supply.
As a specific embodiment of the second flyback energy storage module, the second flyback energy storage module includes a diode D4 and a capacitor C4, an anode of the diode D4 is connected to one end of the third winding, a cathode of the diode D4 is connected to the voltage VIC and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
As a specific embodiment of the second forward energy storage module, the second forward energy storage module includes a diode D5 and a capacitor C5, an anode of the diode D5 is connected to the other end of the fourth winding, a cathode of the diode D5 is connected to one end of the capacitor C5, and the other end of the capacitor C5 is grounded.
As a specific implementation manner of the second sampling module, the second sampling module includes a resistor R7, a resistor R9, a resistor R10, and a MOS transistor Q3, one end of the resistor R7 is connected to the cathode of the diode D5, the other end of the resistor R7 is connected to the drain of the MOS transistor Q3, the gate of the MOS transistor Q3 is connected to one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is connected to the voltage V0, and the other end of the resistor R10 and the source of the MOS transistor Q3 are grounded.
As a specific embodiment of the second switch module, the second switch module includes a transistor Q6 and a zener diode ZD2, a collector of the transistor Q6 is connected to one end of the resistor R7, an emitter of the transistor Q6 is connected to the voltage VIC, a base of the transistor Q6 is connected to a drain of the MOS transistor Q3 and a cathode of the zener diode ZD2, and an anode of the zener diode ZD2 is grounded.
As another specific embodiment of the second switch module, the second switch module includes a resistor R8, a MOS transistor Q4, a transistor Q6, and a zener diode ZD2, an emitter of the transistor Q6 is connected to the voltage VIC, a collector of the transistor Q6 is connected to a connection point between one end of the resistor R7 and a cathode of the diode D5, and one end of the resistor R8, another end of the resistor R8 is connected to a drain of the MOS transistor Q4, a gate of the MOS transistor Q4 is connected to a drain of the MOS transistor Q3, a source of the MOS transistor Q4 is connected to a base of the transistor Q6 and a cathode of the zener diode ZD2, and an anode of the zener diode ZD2 is grounded.
Preferably, the second switch module is a mechanical switch or an electronic switch.
Compared with the prior art, the invention has the following beneficial effects:
(1) the no-load power consumption is reduced, and meanwhile, the consistency of the no-load power consumption under wide-range input and high and low voltages is ensured;
(2) under the condition of wide-range input, the consistency of the working efficiency of the whole machine in high and low pressure is ensured, and higher working efficiency is ensured;
(3) the short-circuit constant-current function is realized by switching the auxiliary power supply of the forward and flyback power supply modules.
In some special applications, for example, a KNX bus power supply requires constant current output when output is short-circuited, compared with the method for realizing short-circuit constant current power supply by adopting a forward winding auxiliary power supply circuit, a linear voltage stabilizing circuit is added in the design of a full voltage input range, the no-load power consumption is about 1W, the no-load power consumption can be below 0.3W after the method is applied, the energy efficiency requirement of an external power supply is met, the full-load efficiency can be improved by 2% when 230V is input, and the improvement effect is more obvious when the input voltage is higher.
Drawings
FIG. 1 is a schematic block diagram of a forward-flyback auxiliary power supply circuit;
FIG. 2 is a schematic diagram of a first embodiment of the present invention;
fig. 3 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
The circuit of the present invention will be described with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the inventive circuit.
Fig. 1 is a schematic diagram of a forward and backward excitation auxiliary power supply circuit, and as shown in the figure, the forward and backward excitation auxiliary power supply circuit includes a flyback energy storage module, a forward energy storage module, a switch module, a sampling module, a first winding, a second winding and a diode;
the first winding and the second winding are arranged on the primary side of the switching power supply, and one end of the first winding, one end of the second winding and one end of the primary side winding of the switching power supply are homonymous ends; the negative pole of diode, power supply VCC is all connected to switch module's supply end, the input of flyback energy storage module is connected to the positive pole of diode, the one end of first winding is connected to flyback energy storage module's output, flyback energy storage module's sampling output end is connected the sampling input of sampling module, sampling module's output connection switch module's input, the control end of switch module is connected to the controlled end of just swashing energy storage module, the other end of second winding is connected to just swashing energy storage module's output, the other end of first winding and the one end ground connection of second winding.
First embodiment
Fig. 2 is a power supply circuit according to a first embodiment of the present invention, which includes a flyback energy storage module, a forward energy storage module, a switch module, a sampling module, a first winding, a second winding, a diode, a capacitor C3, a second flyback energy storage module, a second forward energy storage module, a second sampling module, a second switching module, a third winding, and a fourth winding.
The first winding and the second winding are arranged on the primary side of the switching power supply, one end of the first winding, one end of the second winding and one end of the primary side winding of the switching power supply are homonymous ends, and the other end of the first winding and one end of the second winding are grounded; the third winding and the fourth winding are arranged on the secondary side of the switching power supply, one end of the third winding, one end of the fourth winding and one end of the secondary winding of the switching power supply are homonymous ends, and the other end of the third winding and one end of the fourth winding are grounded. One end of the capacitor C3 is connected to the power supply VCC and the cathode of the diode D2, and the other end of the capacitor C3 is grounded.
The flyback energy storage module comprises a diode D1, a resistor R1 and a capacitor C1, wherein the anode of the diode D1 is connected with one end of the first winding, the cathode of the diode D1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the anode of the diode D2 and one end of the capacitor C1, and the other end of the capacitor C1 is grounded; the sampling module comprises a resistor R2, a resistor R3, a resistor R4 and a MOS transistor Q1, wherein one end of the resistor R2 is connected with the cathode of the diode D1, the other end of the resistor R2 is connected with one end of the resistor R3 and the grid of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected with one end of the resistor R4, and the other end of the resistor R3 and the source of the MOS transistor Q1 are grounded; the switch module comprises a resistor R5, an MOS transistor Q2, a triode Q5 and a zener diode ZD1, wherein an emitter of the triode Q5 is connected with a power supply VCC, a collector of the triode Q5 is connected with one end of a resistor R5 and the other end of the resistor R4, a base of the triode Q5 is connected with a cathode of the zener diode ZD1 and a source of the MOS transistor Q2, the other end of the resistor R5 is connected with a drain of the MOS transistor Q2, a gate of the MOS transistor Q2 is connected with a drain of the MOS transistor Q1, and an anode of the zener diode ZD1 is grounded; the forward energy storage module comprises a diode D3 and a capacitor C2, wherein the anode of the diode D3 is connected with the other end of the second winding, the cathode of the diode D3 is connected with the connection point of the other end of the resistor R4 and the collector of the triode Q5 and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
The second flyback energy storage module comprises a diode D4 and a capacitor C4, the anode of the diode D4 is connected with one end of the third winding, the cathode of the diode D4 is connected with the voltage VIC and one end of the capacitor C4, and the other end of the capacitor C4 is grounded; the second forward energy storage module comprises a diode D5 and a capacitor C5, the anode of the diode D5 is connected with the other end of the fourth winding, the cathode of the diode D5 is connected with one end of the capacitor C5, and the other end of the capacitor C5 is grounded; the second path of sampling module comprises a resistor R7, a resistor R9, a resistor R10 and an MOS tube Q3, wherein one end of the resistor R7 is connected with the cathode of the diode D5, the other end of the resistor R7 is connected with the drain of the MOS tube Q3, the gate of the MOS tube Q3 is connected with one end of a resistor R9 and one end of the resistor R10, the other end of the resistor R9 is connected with a voltage V0, and the other end of the resistor R10 and the source of the MOS tube Q3 are grounded; the second switch module comprises a resistor R8, a MOS transistor Q4, a triode Q6 and a zener diode ZD2, wherein an emitter of the triode Q6 is connected with the voltage VIC, a collector of the triode Q6 is connected with a connection point of one end of a resistor R7 and a cathode of a diode D5 and one end of a resistor R8, the other end of the resistor R8 is connected with a drain of the MOS transistor Q4, a gate of the MOS transistor Q4 is connected with a drain of the MOS transistor Q3, a source of the MOS transistor Q4 is connected with a base of the triode Q6 and a cathode of the zener diode ZD2, and an anode of the zener diode ZD2 is grounded.
When the switching power supply works stably, the two flyback energy storage modules work: the flyback energy storage module is used for IC auxiliary power supply when the switching power supply works stably; and the second flyback energy storage module is used for the auxiliary power supply of the feedback loop when the switching power supply works stably.
Two paths of forward energy storage modules work when the switching power supply is short-circuited: the forward energy storage module is used for outputting power to the IC when in short circuit; and the second forward energy storage module is used for supplying power to the feedback loop when the output is short-circuited.
The sampling module is used for controlling the working state of the switch module, when the switch power supply works stably, the first path of sampling module controls the first path of switch module not to work, the IC is only powered by the flyback energy storage module, when the output of the switch power supply is short-circuited, the sampling module controls the switch module to work, and the IC is only powered by the forward energy storage module; the second sampling module is used for controlling the working state of the second switch module, when the switch power supply works stably, the second sampling module controls the second switch module not to work, the feedback loop is only powered by the second flyback energy storage module, when the output of the switch power supply is short-circuited, the second sampling module controls the second switch module to work, and the feedback loop is only powered by the second flyback energy storage module.
The sampling module divides voltage of the flyback energy storage module through resistors R2 and R3 to sample the voltage of the flyback energy storage module in real time, the sampling voltage is higher when the switching power supply works in a steady state, the sampling voltage is connected with the grid electrode of an MOS tube Q1, when the sampling voltage is higher than the switching threshold voltage of the MOS tube, the MOS tube Q1 is switched on, energy of the forward energy storage module is connected to the ground through a resistor R4 and an MOS tube Q1, the grid electrode potential of an MOS tube Q2 of the switching module is pulled low, the MOS tube Q2 is switched off, and the switching module does not work; when the output of the switching power supply is short-circuited, the output voltage is reduced, the voltage of the flyback energy storage module is reduced along with the output voltage, when the sampling module detects that the sampling voltage is smaller than the switching-on threshold voltage of the MOS tube Q1, the MOS tube Q1 is turned off, the grid potential of the MOS tube Q2 of the switching module is pulled high, the MOS tube Q2 is turned on, the switching module starts to work, the auxiliary IC power supply is switched from the flyback energy storage module to the forward energy storage module, and the diode D2 is used for preventing the forward energy storage module from being abnormal due to the fact that the sampling module carries out sampling mistakenly when; in the feedback loop, the difference from the above is that the second sampling module samples the output voltage, so that a switching diode is not needed to prevent the mis-sampling, and other principles are the same as the above principles and are not repeated.
Second embodiment
Fig. 3 shows a power supply circuit according to a second embodiment of the present invention, which is different from the first embodiment in that the switch module and the second switch module have different configurations:
the switch module comprises a triode Q5 and a voltage stabilizing diode ZD1, an emitting electrode of the triode Q5 is connected with a power supply VCC, a collector electrode of the triode Q5 is connected with the other end of a resistor R4, a base electrode of the triode Q5 is connected with a cathode of the voltage stabilizing diode ZD1 and a drain electrode of an MOS tube Q1, and an anode of the voltage stabilizing diode ZD1 is grounded.
The second switch module comprises a triode Q6 and a voltage stabilizing diode ZD2, the collector of the triode Q6 is connected with one end of a resistor R7, the emitter of the triode Q6 is connected with the voltage VIC, the base of the triode Q6 is connected with the drain of an MOS tube Q3 and the cathode of the voltage stabilizing diode ZD2, and the anode of the voltage stabilizing diode ZD2 is grounded.
The function of each module and the working principle of the double-winding forward and backward excitation auxiliary power supply circuit are the same as those of the first embodiment. The voltage sampled by the sampling circuit is connected with the grid electrode of the MOS tube Q1, when the sampling voltage is higher than the switching-on threshold voltage of the MOS tube, the MOS tube Q1 is conducted, the energy of the forward energy storage module is connected to the ground through the resistor R4 and the MOS tube Q1, the cathode potential of the voltage stabilizing diode ZD1 is pulled low, and the switch module does not work. When the output of the switching power supply is short-circuited, the output voltage is reduced, the voltage of the flyback energy storage module is reduced along with the output voltage, when the sampling module detects that the sampling voltage is smaller than the switching-on threshold voltage of the MOS tube Q1, the MOS tube Q1 is turned off, the potential of the voltage stabilizing diode ZD1 is pulled high, the switching module starts to work, and the auxiliary IC power supply is switched from the flyback energy storage module to the forward energy storage module. The feedback loop has the same principle and is not described in detail.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.

Claims (14)

1. The utility model provides a positive and negative excitation auxiliary power supply circuit for to switching power supply auxiliary power supply which characterized in that: the device comprises a flyback energy storage module, a forward energy storage module, a switch module, a sampling module, a first winding, a second winding and a diode;
the first winding and the second winding are arranged on the primary side of the switching power supply, and one end of the first winding, one end of the second winding and one end of the primary side winding of the switching power supply are homonymous ends; the cathode of the diode and the power supply end of the switch module are both connected with a power supply VCC, the anode of the diode is connected with the input end of the flyback energy storage module, the output end of the flyback energy storage module is connected with one end of the first winding, the sampling output end of the flyback energy storage module is connected with the sampling input end of the sampling module, the output end of the sampling module is connected with the input end of the switch module, the controlled end of the forward energy storage module is connected with the control end of the switch module, the output end of the forward energy storage module is connected with the other end of the second winding, and the other end of the first winding and one end;
the sampling module samples the voltage of the flyback energy storage module, outputs a first sampling signal to the switch module, and controls the working state of the switch module, so that the realization is realized: when the sampling signal is higher than a first set value, the switch module does not work, and the flyback energy storage module supplies power to an IC (integrated circuit) of the switch power supply; when the sampling signal is lower than the first set value, the switch module works, and the forward energy storage module supplies power to the IC of the switch power supply.
2. The forward-flyback auxiliary power supply circuit of claim 1, wherein:
the flyback energy storage module comprises a diode D1 and a capacitor C1, wherein the anode of the diode D1 is connected with one end of the first winding, the cathode of the diode D1 is connected with one end of the capacitor C1 and the anode of the diode D2, and the other end of the capacitor C1 is grounded.
3. The forward-flyback auxiliary power supply circuit of claim 1, wherein:
the sampling module comprises a resistor R2, a resistor R3, a resistor R4 and a MOS transistor Q1, wherein one end of the resistor R2 is connected with the cathode of the diode D1, the other end of the resistor R2 is connected with one end of the resistor R3 and the grid of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected with one end of the resistor R4, and the other end of the resistor R3 and the source of the MOS transistor Q1 are grounded.
4. The forward-flyback auxiliary power supply circuit of claim 1, wherein:
the switch module comprises a triode Q5 and a voltage stabilizing diode ZD1, an emitting electrode of the triode Q5 is connected with a power supply VCC, a collector electrode of the triode Q5 is connected with the other end of a resistor R4, a base electrode of the triode Q5 is connected with a cathode of the voltage stabilizing diode ZD1 and a drain electrode of an MOS transistor Q1, and an anode of the voltage stabilizing diode ZD1 is grounded.
5. The forward-flyback auxiliary power supply circuit of claim 1, wherein:
the switch module comprises a resistor R5, a MOS transistor Q2, a triode Q5 and a zener diode ZD1, wherein an emitter of the triode Q5 is connected with a power supply VCC, a collector of the triode Q5 is connected with one end of the resistor R5 and the other end of the resistor R4, a base of the triode Q5 is connected with a cathode of the zener diode ZD1 and a source of the MOS transistor Q2, the other end of the resistor R5 is connected with a drain of the MOS transistor Q2, a gate of the MOS transistor Q2 is connected with a drain of the MOS transistor Q1, and an anode of the zener diode ZD1 is grounded.
6. The forward-flyback auxiliary power supply circuit of claim 1, wherein:
the forward energy storage module comprises a diode D3 and a capacitor C2, the anode of the diode D3 is connected with the other end of the second winding, the cathode of the diode D3 is connected with the connection point of the other end of the resistor R4 and the collector of the triode Q5 and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
7. The forward-flyback auxiliary power supply circuit of claim 1, wherein: the switch module is a mechanical switch or an electronic switch.
8. A forward-backward excitation power supply circuit is characterized in that: the forward and flyback auxiliary power supply circuit comprises the forward and flyback auxiliary power supply circuit as claimed in any one of claims 1 to 7, and further comprises a second flyback energy storage module, a second forward energy storage module, a second sampling module, a second switch module, a third winding and a fourth winding, wherein the third winding and the fourth winding are arranged on a secondary side of the switch power supply, and one end of the third winding, one end of the fourth winding and one end of the secondary winding of the switch power supply are homonymous ends;
the input end of the second flyback energy storage module is connected with one end of the third winding, the output end of the second flyback energy storage module is connected with the voltage VIC, the input end of the second forward energy storage module is connected with the other end of the fourth winding, the sampling output end of the second forward energy storage module is connected with the sampling input end of the second sampling module, the input end of the second switch module is connected with the output end of the second sampling module, the output end of the second switch module is connected with the voltage VIC, and the other end of the third winding is grounded with one end of the fourth winding;
the second way of sampling module samples the voltage of the forward energy storage module, outputs a second sampling signal to the second way of switch module, and controls the working state of the second way of switch module, thereby realizing: when the sampling voltage is higher than a second set value, the second switch module does not work, and the second flyback energy storage module supplies power to a feedback loop of the switch power supply; when the second sampling signal is lower than a second set value, the second switch module works, and the second forward energy storage module supplies power to a feedback loop of the switch power supply.
9. The forward-flyback power supply circuit of claim 8, wherein:
the second flyback energy storage module comprises a diode D4 and a capacitor C4, the anode of the diode D4 is connected with one end of the third winding, the cathode of the diode D4 is connected with the voltage VIC and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.
10. The forward-flyback power supply circuit of claim 8, wherein:
the second forward energy storage module comprises a diode D5 and a capacitor C5, the anode of the diode D5 is connected with the other end of the fourth winding, the cathode of the diode D5 is connected with one end of the capacitor C5, and the other end of the capacitor C5 is grounded.
11. The forward-flyback power supply circuit of claim 8, wherein:
the second sampling module comprises a resistor R7, a resistor R9, a resistor R10 and a MOS transistor Q3, wherein one end of the resistor R7 is connected with the cathode of the diode D5, the other end of the resistor R7 is connected with the drain of the MOS transistor Q3, the gate of the MOS transistor Q3 is connected with one end of the resistor R9 and one end of the resistor R10, the other end of the resistor R9 is connected with a voltage V0, and the other end of the resistor R10 and the source of the MOS transistor Q3 are grounded.
12. The forward-flyback power supply circuit of claim 8, wherein:
the second switch module comprises a triode Q6 and a voltage stabilizing diode ZD2, wherein the collector of the triode Q6 is connected with one end of a resistor R7, the emitter of the triode Q6 is connected with a voltage VIC, the base of the triode Q6 is connected with the drain of an MOS (metal oxide semiconductor) tube Q3 and the cathode of the voltage stabilizing diode ZD2, and the anode of the voltage stabilizing diode ZD2 is grounded.
13. The forward-flyback power supply circuit of claim 8, wherein:
the second switch module comprises a resistor R8, a MOS transistor Q4, a triode Q6 and a zener diode ZD2, wherein an emitter of the triode Q6 is connected with the voltage VIC, a collector of the triode Q6 is connected with a connection point of one end of a resistor R7 and a cathode of a diode D5 and one end of the resistor R8, the other end of the resistor R8 is connected with a drain of the MOS transistor Q4, a gate of the MOS transistor Q4 is connected with a drain of the MOS transistor Q3, a source of the MOS transistor Q4 is connected with a base of the triode Q6 and a cathode of the zener diode ZD2, and an anode of the zener diode ZD2 is grounded.
14. The forward-flyback power supply circuit of claim 8, wherein: the second switch module is a mechanical switch or an electronic switch.
CN201911280531.XA 2019-12-13 2019-12-13 Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit Active CN111082640B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911280531.XA CN111082640B (en) 2019-12-13 2019-12-13 Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911280531.XA CN111082640B (en) 2019-12-13 2019-12-13 Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit

Publications (2)

Publication Number Publication Date
CN111082640A true CN111082640A (en) 2020-04-28
CN111082640B CN111082640B (en) 2021-06-08

Family

ID=70314218

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911280531.XA Active CN111082640B (en) 2019-12-13 2019-12-13 Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit

Country Status (1)

Country Link
CN (1) CN111082640B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244077A (en) * 2022-02-24 2022-03-25 深圳市暗能量电源有限公司 Power supply circuit and power supply method suitable for wide voltage output
WO2024066493A1 (en) * 2022-09-29 2024-04-04 上海新进芯微电子有限公司 Circuit for supplying power to switch power source control circuit on basis of auxiliary winding

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09131074A (en) * 1995-10-30 1997-05-16 Canon Inc Power circuit
CN2882100Y (en) * 2006-03-14 2007-03-21 欧坚 Switch power supply device
CN203895960U (en) * 2014-05-27 2014-10-22 深圳市振华微电子有限公司 Undervoltage protection circuit
CN106162985A (en) * 2016-06-30 2016-11-23 成都芯源系统有限公司 LED driver and driving method
CN107453624A (en) * 2017-07-26 2017-12-08 广州金升阳科技有限公司 A kind of auxiliary power supply circuit
CN208861199U (en) * 2018-08-15 2019-05-14 南京普天大唐信息电子有限公司 A kind of multilevel decompression voltage regulator circuit with clamper function
CN209030096U (en) * 2018-10-30 2019-06-25 广州金升阳科技有限公司 A kind of constant pressure and flow power-supplying circuit
CN209046505U (en) * 2018-09-26 2019-06-28 北京迪赛奇正科技有限公司 A kind of power supply circuit not needing accessory power supply
CN109980901A (en) * 2019-03-05 2019-07-05 合肥华耀电子工业有限公司 A kind of auxiliary power supply circuit of wide input range power module
CN110417270A (en) * 2019-07-19 2019-11-05 广州金升阳科技有限公司 A kind of simplex winding Forward- flyback auxiliary power supply circuit

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09131074A (en) * 1995-10-30 1997-05-16 Canon Inc Power circuit
CN2882100Y (en) * 2006-03-14 2007-03-21 欧坚 Switch power supply device
CN203895960U (en) * 2014-05-27 2014-10-22 深圳市振华微电子有限公司 Undervoltage protection circuit
CN106162985A (en) * 2016-06-30 2016-11-23 成都芯源系统有限公司 LED driver and driving method
CN107453624A (en) * 2017-07-26 2017-12-08 广州金升阳科技有限公司 A kind of auxiliary power supply circuit
CN208861199U (en) * 2018-08-15 2019-05-14 南京普天大唐信息电子有限公司 A kind of multilevel decompression voltage regulator circuit with clamper function
CN209046505U (en) * 2018-09-26 2019-06-28 北京迪赛奇正科技有限公司 A kind of power supply circuit not needing accessory power supply
CN209030096U (en) * 2018-10-30 2019-06-25 广州金升阳科技有限公司 A kind of constant pressure and flow power-supplying circuit
CN109980901A (en) * 2019-03-05 2019-07-05 合肥华耀电子工业有限公司 A kind of auxiliary power supply circuit of wide input range power module
CN110417270A (en) * 2019-07-19 2019-11-05 广州金升阳科技有限公司 A kind of simplex winding Forward- flyback auxiliary power supply circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244077A (en) * 2022-02-24 2022-03-25 深圳市暗能量电源有限公司 Power supply circuit and power supply method suitable for wide voltage output
WO2024066493A1 (en) * 2022-09-29 2024-04-04 上海新进芯微电子有限公司 Circuit for supplying power to switch power source control circuit on basis of auxiliary winding

Also Published As

Publication number Publication date
CN111082640B (en) 2021-06-08

Similar Documents

Publication Publication Date Title
CN101114797B (en) Constant voltage supply circuit
CN103326458B (en) A kind of external power source and battery powered power supply switch circuit
CN111082640B (en) Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit
CN210898633U (en) Redundant direct current power supply switching system for power communication
CN102097923B (en) Driving circuit with zero turn-off current and driving method thereof
CN203301611U (en) Direct-current switching circuit and switching power source
CN214380275U (en) Dual-power supply circuit and dual-power supply system of T-Box controller
CN208353213U (en) A kind of Switching Power Supply start-up circuit
CN112769093A (en) Current-limiting control circuit, chip and power supply
CN107508458B (en) Starting circuit of PWM chip of ultra-wide voltage auxiliary power supply
KR102215378B1 (en) Protection circuit and LED driving circuit
CN208285214U (en) A kind of stagnant ring driving device of low-power consumption
CN207530528U (en) Inverter and inverter protection device
CN101414782B (en) Remote control power-off circuit for PWM switch power supply
CN203596799U (en) Automatic switching power amplifier power supply circuit and device
CN208707519U (en) Control switch circuit and switching power circuit
CN220273376U (en) Power supply switching circuit
CN217486227U (en) Lithium battery and external power supply switching circuit
CN219498950U (en) Battery low voltage protection circuit and PCB board
CN109378252B (en) Direct current relay drive control circuit
CN220440557U (en) SiC switching tube driving control circuit in switching power supply
CN212627203U (en) Power supply path selection circuit and POS machine
CN220605773U (en) Automatic code dialing circuit and voltage doubling circuit
CN216598957U (en) Plant lighting short-circuit protection circuit and power supply
CN116707504B (en) Negative pressure switch control circuit and method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant