CN109462264B - AC-DC chip self-powered circuit and charger - Google Patents
AC-DC chip self-powered circuit and charger Download PDFInfo
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- CN109462264B CN109462264B CN201811373855.3A CN201811373855A CN109462264B CN 109462264 B CN109462264 B CN 109462264B CN 201811373855 A CN201811373855 A CN 201811373855A CN 109462264 B CN109462264 B CN 109462264B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 238000004146 energy storage Methods 0.000 claims abstract description 39
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The AC-DC chip self-powered circuit comprises a rectification filter circuit module, a power supply conversion chip, a first voltage sampling module, a second voltage sampling module, an energy storage module and an energy storage transformation module, wherein the rectification filter circuit module is used for rectification filter processing; the power conversion chip is used for switching a power supply mode according to the first voltage, the second voltage and a preset turn-off voltage; the first voltage sampling module is used for detecting a voltage signal of a power supply end of the power supply conversion chip so as to generate a first voltage; the second voltage sampling module is used for detecting a voltage signal of a voltage feedback end of the power conversion chip so as to generate a second voltage; the energy storage module is used for supplying power to the power conversion chip, and is not charged when the first voltage is larger than the first turn-off voltage and is charged when the first voltage is not larger than the first turn-off voltage; the energy storage transformation module is used for storing energy according to the second voltage, does not adjust the pre-turn-off voltage of the triode, improves the power supply conversion efficiency and has good voltage stability.
Description
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to an AC-DC chip self-powered circuit and a charger.
Background
At present, as shown in fig. 1, an AC-DC (Alternating Current-Direct Current) chip self-power supply circuit supplies power to a whole AC-DC chip 1 by an energy storage capacitor 2, and the charging time of the energy storage capacitor 2 is regulated by the pre-turn-off voltage of the AC-DC chip self-power supply circuit, that is, the charging time of the energy storage capacitor 2 is regulated by regulating the pre-turn-off voltage of a triode Q0, so that the charging time and the charging amount are dynamically balanced, and the pre-turn-off voltage of the triode is always in a dynamic regulation state, so that the triode cannot be fixedly operated in an optimal state, and the power conversion efficiency is reduced.
Therefore, the self-powered circuit of the AC-DC chip in the traditional technical scheme has the problem that the pre-turn-off voltage of the dynamic adjusting triode cannot be fixedly operated in an optimal state, so that the power supply conversion efficiency is low.
Disclosure of Invention
The invention provides an AC-DC chip self-powered circuit and a charger, and aims to solve the problem that the power conversion efficiency is low because the pre-turn-off voltage of a dynamic adjusting triode cannot be fixedly operated in an optimal state in the traditional technical scheme of the AC-DC chip self-powered circuit.
The invention is realized in that an AC-DC chip self-powered circuit comprises:
the rectification filter circuit module is connected with the mains supply and used for rectification filter treatment;
the power supply conversion chip is connected with the rectifying and filtering circuit module and is used for switching a power supply mode according to the first voltage, the second voltage and a preset turn-off voltage;
the first voltage sampling module is connected with the power supply conversion chip and used for detecting a voltage signal of a power supply end of the power supply conversion chip so as to generate the first voltage;
the second voltage sampling module is connected with the power conversion chip and used for detecting a voltage signal of a voltage feedback end of the power conversion chip so as to generate the second voltage;
the energy storage module is connected with the power conversion chip and the second voltage sampling module, is used for supplying power to the power conversion chip, and is not charged when the first voltage is larger than a first turn-off voltage and is charged when the first voltage is not larger than the first turn-off voltage; and
The energy storage transformation module is connected with the first voltage sampling module and used for storing energy according to the second voltage;
wherein, the power conversion chip includes:
the first comparison unit is connected with the first voltage sampling module and is used for generating a first level signal according to the first voltage and a first turn-off voltage;
the second comparison unit is connected with the second voltage sampling module and is used for generating a second level signal according to the second voltage and a second turn-off voltage;
the logic unit is connected with the first comparison unit and the second comparison unit and is used for generating logic signals according to the first level signals or the second level signals;
the first switch unit is connected with the logic unit and is used for switching on or off according to the logic signal so as to switch the power supply mode;
the turn-off driving unit is connected with the second voltage sampling module and used for generating turn-off driving signals according to the second voltage, the third turn-off voltage and the fourth turn-off voltage;
the second switch unit is connected with the turn-off driving unit and is used for being turned on or turned off according to the turn-off driving signal so as to switch the power supply mode; and
And the rectification unit is connected with the first switch unit, the second switch unit, the first voltage sampling unit and the energy storage module and used for rectification processing.
In addition, a charger is also provided, which comprises the AC-DC chip self-powered circuit.
According to the AC-DC chip self-powered circuit, the first voltage sampling module detects the voltage signal of the power supply end of the power supply conversion chip to generate the first voltage, the second voltage sampling module detects the voltage signal of the voltage feedback end of the power supply conversion chip to generate the second voltage, so that the power supply conversion chip can switch the power supply mode according to the first voltage, the second voltage and the preset turn-off voltage, when the first voltage is larger than the first turn-off voltage, the first stage directly enters the third stage, the energy storage module is not charged, and when the first voltage is not larger than the first turn-off voltage, the first stage enters the second stage, the energy storage module is charged, the switching between the two-stage power supply mode and the three-stage power supply mode is realized, the power supply of the power storage module is realized, the pre-turn-off voltage is not regulated, and the power supply conversion efficiency is improved.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art AC-DC chip self-powered circuit;
FIG. 2 is a schematic diagram of a self-powered circuit of an AC-DC chip according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a self-powered circuit of an AC-DC chip according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an AC-DC chip self-power circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 2 is a schematic block diagram of an AC-DC chip self-power circuit according to a preferred embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment are shown, which are described in detail below:
referring to fig. 2, an AC-DC chip self-powered circuit, comprising: the power supply circuit comprises a rectifying and filtering circuit module 60, a power supply conversion chip 10, a first voltage sampling module 20, a second voltage sampling module 40, an energy storage module 30 and an energy storage and transformation module 50.
The rectification filter circuit module 60 is connected with the mains supply and is used for rectification filter processing; the power conversion chip 10 is connected with the rectifying and filtering circuit module 60 and is used for switching a power supply mode according to the first voltage, the second voltage and a preset turn-off voltage; the first voltage sampling module 20 is connected with the power conversion chip 10 and is used for detecting a voltage signal of a power supply end of the power conversion chip 10 to generate a first voltage; the second voltage sampling module 40 is connected to the power conversion chip 10, and is configured to detect a voltage signal at a voltage feedback end of the power conversion chip 10 to generate a second voltage; the energy storage module 30 is connected with the power conversion chip 10 and the second voltage sampling module 40, and is used for supplying power to the power conversion chip 10, and is not charged when the first voltage is greater than the first turn-off voltage VREF1 and is charged when the first voltage is not greater than the first turn-off voltage VREF 1; the energy storage transformation module 50 is connected to the first voltage sampling module 20, and is used for storing energy according to the second voltage. In a specific embodiment, the second voltage sampling module 40 includes a third resistor, a first end of the third resistor is an input end of the second voltage sampling module 40, and a second end of the third resistor is an output end of the second voltage sampling module 40; the energy storage module 30 includes a first capacitor, a first end of the first capacitor is a first end of the energy storage module 30, and a second end of the first capacitor is a second end of the energy storage module 30; the energy storage transformation module 50 is implemented by a transformer.
Specifically, the power conversion chip 10 includes: the first comparing unit 101, the second comparing unit 102, the logic unit 103, the first switching unit 104, the off driving unit 105, the second switching unit 106, and the rectifying unit 107. The first comparing unit 101 is connected to the first voltage sampling module 20, and is configured to generate a first level signal according to the first voltage and the first off voltage VREF 1; the second comparing unit 102 is connected to the second voltage sampling module 40, and is configured to generate a second level signal according to the second voltage and the second off voltage VREF 2; the logic unit 103 is connected to the first comparing unit 101 and the second comparing unit 102, and is configured to generate a logic signal according to the first level signal or the second level signal; the first switch unit 104 is connected with the logic unit 103 and is used for switching the power supply mode according to the on or off of the logic signal; the turn-off driving unit 105 is connected to the second voltage sampling module 40, and is configured to generate a turn-off driving signal according to the second voltage, the third turn-off voltage VREF3, and the fourth turn-off voltage VREF 4; the second switch unit 106 is connected with the turn-off driving unit 105, and is used for being turned on or turned off according to the turn-off driving signal to switch the power supply mode; the rectifying unit 107 is connected to the first switching unit 104, the second switching unit 106, the first voltage sampling unit, and the energy storage module 30, and is used for rectifying.
In this embodiment, the first voltage sampling module 20 detects the voltage signal of the power supply end of the power conversion chip 10 to generate the first voltage, the second voltage sampling module 40 detects the voltage signal of the voltage feedback end of the power conversion chip 10 to generate the second voltage, so that the power conversion chip 10 switches the power supply modes according to the first voltage, the second voltage and the preset turn-off voltage, when the first voltage is greater than the first turn-off voltage VREF1, the first stage directly enters the third stage, the energy storage module 30 is not charged, and when the first voltage is not greater than the first turn-off voltage VREF1, the first stage enters the second stage, the energy storage module 30 is charged, and the switching between the two-stage and the three-stage power supply modes is realized, so that the energy storage module 30 supplies power to the power conversion chip 10. The pre-turn-off voltage of the second switching tube Q1 is not regulated, so that the power conversion efficiency is improved, and meanwhile, the stability is good.
In one embodiment, referring to fig. 3, the power conversion chip 10 further includes a reference voltage generating unit 108, and the reference voltage generating unit 108 is connected to the first comparing unit 101, the second comparing unit 102, and the off driving unit 105, and is configured to generate a first off voltage VREF1, a second off voltage VREF2, a third off voltage VREF3, and a fourth off voltage VREF4.
In one embodiment, referring to fig. 4, the first comparing unit 101 includes: the non-inverting input end of the first comparator COMP1 is the first input end of the first comparing unit 101 and is connected to the output end of the reference voltage generating unit 108, the inverting input end of the first comparator COMP1 is the second input end of the first comparing unit 101 and is connected to the output end of the first voltage sampling module 20, and the output end of the first comparator COMP1 is the output end of the first comparing unit 101.
In one embodiment, referring to fig. 4, the second comparing unit 102 includes: the non-inverting input end of the second comparator COMP2 is the first input end of the second comparing unit 102 and is connected to the output end of the reference voltage generating unit 108, the inverting input end of the second comparator COMP2 is the second input end of the first comparing unit 101 and is connected to the output end of the second voltage sampling module 40, and the output end of the second comparator COMP2 is the output end of the second comparing unit 102.
In one embodiment, referring to fig. 4, the logic unit 103 includes: the first input end of the NAND gate NAND is the first input end of the logic unit 103, the second input end of the NAND gate NAND is the second input end of the logic unit 103, and the output end of the NAND gate NAND is the output end of the logic unit 103.
In one embodiment, referring to fig. 4, the off-driving unit 105 includes: the non-inverting input end of the third comparator COMP3 is the first input end of the turn-off driving unit 105 and is connected with the output end of the reference voltage generating unit 108, the non-inverting input end of the fourth comparator COMP4 is the second input end of the turn-off driving unit 105 and is connected with the output end of the reference voltage generating unit 108, the inverting input end of the third comparator COMP3 is the third input end of the turn-off driving unit 105 and is connected with the output end of the second voltage sampling module 40, the inverting input end of the fourth comparator COMP4 is the fourth input end of the turn-off driving unit 105 and is connected with the output end of the second voltage sampling module 40, the output end of the third comparator COMP3 and the output end of the fourth comparator COMP4 are respectively connected with the driving unit, and the output end of the driving unit is the output end of the turn-off driving unit 105. The third comparator COMP3 in this embodiment is a pre-shutdown comparator, the fourth comparator COMP4 is a shutdown comparator, the third comparator COMP3 reduces the driving current after pre-shutdown, which plays a buffering role, the fourth comparator COMP4 directly shuts off the driving current after shutdown, and the pre-shutdown voltage is not regulated, so that the power conversion efficiency is improved, and the stability is good.
In one embodiment, referring to fig. 4, the first voltage sampling module 20 includes: the first end of the first resistor R1 is grounded, the second end of the first resistor R1 and the first end of the second resistor R2 are commonly connected to serve as an output end of the first voltage sampling module 20, and the second end of the second resistor R2 is an input end of the first voltage sampling module 20. The first voltage sampling module 20 of this embodiment can realize controlling the turn-off of the first switching tube M1 by detecting the voltage of the power supply end of the power supply conversion chip 10, so that the energy storage module 30 supplies power to the power supply conversion chip 10, and when the first voltage is greater than the first turn-off voltage VREF1, the first stage directly enters the third stage, the energy storage module 30 is not charged, and when the first voltage is not greater than the first turn-off voltage VREF1, the first stage enters the second stage, the energy storage module 30 is charged, and the pre-turn-off voltage is not regulated, thereby improving the power supply conversion efficiency.
In one embodiment, referring to fig. 4, the first switching unit 104 includes: the control end of the first switching tube M1 is the control end of the first switching unit 104, the input end of the first switching tube M1 is the input end of the first switching unit 104, and the output end of the first switching tube M1 is the output end of the first switching unit 104. In a specific embodiment, the first switching tube M1 is an NMOS tube, and the gate, the drain, and the source of the NMOS tube are the control end, the input end, and the output end of the first switching tube M1, respectively.
In one embodiment, referring to fig. 4, the second switching unit 106 includes: the control end of the second switching tube Q1 is the control end of the second switching unit 106, the input end of the second switching tube Q1 is the input end of the second switching unit 106, and the output end of the second switching tube Q1 is the output end of the second switching unit 106. In a specific embodiment, the second switching tube Q1 is an NPN transistor, and a base, a collector and an emitter of the NPN transistor are a control terminal, an input terminal and an output terminal of the second switching tube Q1, respectively. The embodiment can realize that the energy storage module 30 is not charged when the first voltage is greater than the first turn-off voltage VREF1 and is charged when the first voltage is not greater than the first turn-off voltage VREF1, and realize the switching of the two-stage and three-stage power supply modes, thereby realizing the power supply of the energy storage module 30 to the power conversion chip 10, and not regulating the pre-turn-off voltage of the triode, and improving the power conversion efficiency.
In addition, a charger is also provided, which comprises the AC-DC chip self-powered circuit.
The following describes the working principle of the AC-DC chip self-powered circuit shown in fig. 3 by taking an example, and the following details are as follows:
the self-powered circuit of the AC-DC chip supplies power to the power conversion chip 10 through the energy storage module 30, and directly enters a third stage from the first stage when the first voltage is larger than the first turn-off voltage VREF1, the energy storage module 30 is not charged, and enters a second stage from the first stage when the first voltage is not larger than the first turn-off voltage VREF1, and the energy storage module 30 is charged; the working process of the self-powered circuit of the AC-DC chip comprises the following 3 stages:
the first stage: the rectification filter circuit module 60 performs rectification filter treatment on alternating current commercial power, and then inputs the alternating current commercial power to a primary side winding of a transformer for energy storage through a second switch tube Q1, a first switch tube M1 and a third resistor, the first resistor R1 and the second resistor R2 detect a voltage signal at a power supply end of the power supply conversion chip 10 to generate a first voltage, and the third resistor detects a voltage signal at a voltage feedback end of the power supply conversion chip 10 to generate a second voltage; when the first voltage is not greater than the first turn-off voltage VREF1, the first comparator COMP1 outputs a high level according to the first voltage and the first turn-off voltage VREF1, the NAND gate NAND is controlled by the second comparator COMP2 at this time, and when the second voltage is greater than the second turn-off voltage VREF2, the second comparator COMP2 outputs a low level, so that the NAND gate NAND outputs a high level, and the first switching tube M1 is kept on to be maintained in the first stage; and when the second voltage drops to be not greater than the second turn-off voltage VREF2, the second comparator COMP2 outputs a high level, so that the NAND gate NAND outputs a low level, thereby controlling the first switching transistor M1 to be turned off and enter the second stage.
And a second stage: when the second voltage drops to be not more than a third turn-off voltage VREF3, the third comparator COMP3 (pre-turn-off comparator) outputs a high level according to the second voltage and the third turn-off voltage VREF3, so that the driving unit reduces the output driving current until the second voltage drops to be not more than a fourth turn-off voltage VREF4, the fourth comparator COMP4 (turn-off comparator) outputs a high level according to the second voltage and the fourth turn-off voltage VREF4, and the driving unit directly turns off the output driving current, thereby enabling the first switching tube M1 to be turned off and enter a third stage.
And a third stage: when the second voltage is larger than the first turn-off voltage VREF1, the first comparator COMP1 outputs a low level according to the first voltage and the first turn-off voltage VREF1, the NAND gate NAND is controlled by the first comparator COMP1, and the low level outputs a high level after passing through the NAND gate NAND, so that the first switch tube M1 is controlled to be turned on, the first stage is restarted, and the transformer outputs a stable voltage.
The invention has the beneficial effects that:
(1) The voltage signal of the power supply end of the power supply conversion chip is detected by the first voltage sampling module to generate a first voltage, the voltage signal of the voltage feedback end of the power supply conversion chip is detected by the second voltage sampling module to generate a second voltage, so that the power supply conversion chip can switch a power supply mode according to the first voltage, the second voltage and a preset turn-off voltage, when the first voltage is larger than the first turn-off voltage, the first stage directly enters a third stage, the energy storage module is not charged, and when the first voltage is not larger than the first turn-off voltage, the first stage enters a second stage, the energy storage module is charged, and the switching of two-stage and three-stage power supply is realized, so that the energy storage module supplies power to the power supply conversion chip.
(2) The pre-turn-off voltage of the second switching tube is not regulated, so that the second switching tube can be turned off under the set voltage, the power conversion efficiency is improved, and meanwhile, the stability is good.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. An AC-DC chip self-powered circuit, the AC-DC chip self-powered circuit comprising:
the rectification filter circuit module is connected with the mains supply and used for rectification filter treatment;
the power supply conversion chip is connected with the rectifying and filtering circuit module and is used for switching a power supply mode according to the first voltage, the second voltage and a preset turn-off voltage;
the first voltage sampling module is connected with the power supply conversion chip and used for detecting a voltage signal of a power supply end of the power supply conversion chip so as to generate the first voltage;
the second voltage sampling module is connected with the power conversion chip and used for detecting a voltage signal of a voltage feedback end of the power conversion chip so as to generate the second voltage;
the energy storage module is connected with the power conversion chip and the second voltage sampling module, is used for supplying power to the power conversion chip, and is not charged when the first voltage is larger than a first turn-off voltage and is charged when the first voltage is not larger than the first turn-off voltage; and
The energy storage transformation module is connected with the first voltage sampling module and used for storing energy according to the second voltage;
wherein, the power conversion chip includes:
the first comparison unit is connected with the first voltage sampling module and is used for generating a first level signal according to the first voltage and a first turn-off voltage;
the second comparison unit is connected with the second voltage sampling module and is used for generating a second level signal according to the second voltage and a second turn-off voltage;
the logic unit is connected with the first comparison unit and the second comparison unit and is used for generating logic signals according to the first level signals or the second level signals;
the first switch unit is connected with the logic unit and is used for switching on or off according to the logic signal so as to switch the power supply mode;
the turn-off driving unit is connected with the second voltage sampling module and used for generating turn-off driving signals according to the second voltage, the third turn-off voltage and the fourth turn-off voltage; wherein the fourth off voltage is less than the third off voltage;
the second switch unit is connected with the turn-off driving unit and is used for being turned on or turned off according to the turn-off driving signal so as to switch the power supply mode; and
The rectification unit is connected with the first switch unit, the second switch unit, the first voltage sampling module and the energy storage module and used for rectification treatment;
the power conversion chip further includes:
and the reference voltage generating unit is connected with the first comparing unit, the second comparing unit and the turn-off driving unit and is used for generating the first turn-off voltage, the second turn-off voltage, the third turn-off voltage and the fourth turn-off voltage.
2. The AC-DC chip self-powered circuit of claim 1, wherein the first comparison unit comprises:
the non-inverting input end of the first comparator is the first input end of the first comparison unit and is connected with the output end of the reference voltage generation unit, the inverting input end of the first comparator is the second input end of the first comparison unit and is connected with the output end of the first voltage sampling module, and the output end of the first comparator is the output end of the first comparison unit.
3. The AC-DC chip self-powered circuit of claim 1, wherein the second comparison unit comprises:
the non-inverting input end of the second comparator is the first input end of the second comparison unit and is connected with the output end of the reference voltage generation unit, the inverting input end of the second comparator is the second input end of the first comparison unit and is connected with the output end of the second voltage sampling module, and the output end of the second comparator is the output end of the second comparison unit.
4. The AC-DC chip self-powered circuit of claim 1, wherein the logic unit comprises:
the first input end of the NAND gate is the first input end of the logic unit, the second input end of the NAND gate is the second input end of the logic unit, and the output end of the NAND gate is the output end of the logic unit.
5. The AC-DC chip self-powered circuit of claim 1, wherein the turn-off driving unit comprises:
the non-inverting input end of the third comparator is the first input end of the turn-off driving unit and is connected with the output end of the reference voltage generating unit, the non-inverting input end of the fourth comparator is the second input end of the turn-off driving unit and is connected with the output end of the reference voltage generating unit, the inverting input end of the third comparator is the third input end of the turn-off driving unit and is connected with the output end of the second voltage sampling module, the inverting input end of the fourth comparator is the fourth input end of the turn-off driving unit and is connected with the output end of the second voltage sampling module, the output end of the third comparator and the output end of the fourth comparator are respectively connected with the driving unit, and the output end of the driving unit is the output end of the turn-off driving unit.
6. The AC-DC chip self-powered circuit of claim 1, wherein the first voltage sampling module comprises:
the first end of the first resistor is grounded, the second end of the first resistor and the first end of the second resistor are connected together to serve as the output end of the first voltage sampling module, and the second end of the second resistor is the input end of the first voltage sampling module.
7. The AC-DC chip self-powered circuit of claim 1, wherein the first switching unit comprises:
the control end of the first switching tube is the control end of the first switching unit, the input end of the first switching tube is the input end of the first switching unit, and the output end of the first switching tube is the output end of the first switching unit.
8. The AC-DC chip self-powered circuit of claim 1, wherein the second switching unit comprises:
the control end of the second switching tube is the control end of the second switching unit, the input end of the second switching tube is the input end of the second switching unit, and the output end of the second switching tube is the output end of the second switching unit.
9. A charger comprising the AC-DC chip self-powered circuit of any one of claims 1 to 8.
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| CN201811373855.3A CN109462264B (en) | 2018-11-19 | 2018-11-19 | AC-DC chip self-powered circuit and charger |
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| CN201811373855.3A CN109462264B (en) | 2018-11-19 | 2018-11-19 | AC-DC chip self-powered circuit and charger |
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| CN109462264B true CN109462264B (en) | 2024-03-12 |
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