CN112310989A - Overflow energy storage type power circuit - Google Patents
Overflow energy storage type power circuit Download PDFInfo
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- CN112310989A CN112310989A CN202011184247.5A CN202011184247A CN112310989A CN 112310989 A CN112310989 A CN 112310989A CN 202011184247 A CN202011184247 A CN 202011184247A CN 112310989 A CN112310989 A CN 112310989A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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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
- H02J15/00—Systems for storing electric energy
- H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- 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
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention discloses an overflow energy storage type power supply circuit which comprises an energy storage circuit, a rectifying and filtering circuit, a booster circuit, an overvoltage detection circuit, an overcurrent detection circuit, a first switch control circuit S1 and a second switch control circuit. During the operation of the micro-generator based on the elastic energy storage element, the rotating speed of the generator is gradually attenuated from high to low. When the overvoltage detection circuit works normally, the energy storage circuit stores redundant electric energy in the front stage with higher rotating speed and releases the stored electric energy through the booster circuit in the rear stage with lower rotating speed under the control of the overvoltage detection circuit; when overload occurs, the energy storage circuit stores the electric energy generated by the generator for subsequent use under the control of the overcurrent detection circuit. The invention prolongs the power supply time of the micro generator based on the elastic energy storage element and improves the overall efficiency of the generator.
Description
Technical Field
The invention belongs to the field of micro generators, and particularly relates to an overflow energy storage type power circuit.
Background
In some portable devices with long-term storage requirements, in order to ensure that the power supply associated with the portable devices does not fail during the storage period, a physical power supply based on a micro-generator is often used instead of a chemical power supply such as a battery. The micro generator mainly stores energy by using elastic elements such as a spring, a coil spring or a spiral spring, the elements are screwed before storage, and when the portable equipment needs to be powered, the stored elastic potential energy is converted into electric energy by releasing the elastic elements so as to support the normal work of the equipment.
CN201710011983.2 discloses a spring miniature generator, which stores energy in a spring by a manual rotating knob, and controls the spring to slowly release by the mutual cooperation of a damping sheet and a damping gear, so that elastic potential energy is stably converted into electric energy. However, although the invention prolongs the power supply time by adding the damping sheet and the damping gear, the low-speed time of the generator is still longer, the voltage provided by the generator is lower when the generator is at low speed, the rear-stage circuit generally cannot work normally, the residual kinetic energy of the generator cannot be fully utilized, and the stored energy of the generator can be rapidly released when the generator is overloaded, so that the conversion efficiency of the invention is not high.
Disclosure of Invention
The invention aims to provide an overflow energy storage type power supply circuit which is adaptive to a micro generator, so that the generator can still supply power normally at a low rotating speed even within a period of time after the rotation of the generator is stopped, and the electric energy generated by the generator can be stored again when the generator is overloaded.
The technical solution for realizing the purpose of the invention is as follows: an overflow energy storage type power supply circuit comprises an energy storage circuit, a rectifying and filtering circuit, a booster circuit, an overvoltage detection circuit, an overcurrent detection circuit, a first switch control circuit S1 and a second switch control circuit S2. The output end of the generator is connected to the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is divided into two paths, one path is directly connected with the input end of the overcurrent detection circuit, the other path is connected with the input end of the overcurrent detection circuit through the first switch control circuit S1, the energy storage circuit and the booster circuit in sequence, and the output end of the overcurrent detection circuit is connected with a load through the second switch control circuit S2. The input end of the overvoltage detection circuit is connected with the input end of the overcurrent detection circuit, the output end of the overvoltage detection circuit is connected with the control end of the first switch control circuit S1, and the output end of the overcurrent detection circuit is connected with the control ends of the first switch control circuit S1 and the second switch control circuit S2. By utilizing the energy storage circuit, redundant electric energy can be stored when the rotating speed of the generator is high or the generator is overloaded; by utilizing the booster circuit, the previously stored electric energy can be boosted to the required voltage when the rotating speed of the generator is low or the generator stops rotating, so that the power supply time of the generator is prolonged, and the efficiency is improved; by using the overcurrent detection circuit, the load can be cut off when the overload occurs, and the electric energy is stored in the energy storage circuit for subsequent use.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the electric energy storage device has the advantages that redundant electric energy can be stored in the energy storage circuit when the rotating speed of the micro generator based on the elastic energy storage element is high, and the electric energy is taken out from the energy storage circuit for load use in a period of time after the rotating speed of the generator is low and even stops rotating, so that the power supply time of the generator is prolonged.
(2) The damping of the generator is not improved intentionally, so that the low-rotating-speed running time of the generator is shorter, the kinetic energy of the generator is fully utilized, and the efficiency of the generator is improved.
(3) When the overload happens, the power supply to the load is stopped, and the electric energy is stored in the energy storage circuit for subsequent use, so that the problem of electric energy waste during the overload is avoided.
Drawings
Fig. 1 is a schematic block diagram of an overflow energy storage type power supply circuit of the present invention.
Fig. 2 is a circuit diagram of an overflow energy storage type power circuit according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
The invention relates to an overflow energy storage type power supply circuit which is suitable for a micro generator and comprises an energy storage circuit, a rectifying and filtering circuit, a booster circuit, an overvoltage detection circuit, an overcurrent detection circuit, a first switch control circuit S1 and a second switch control circuit S2.
As shown in fig. 1, the solid line represents the connection between the main circuits, and the broken line represents the connection between the control circuits. In the main circuit, the output end of the generator is connected to the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is divided into two paths, one path is directly connected with the input end of the over-current detection circuit, the other path is connected with the input end of the over-current detection circuit through the first switch control circuit S1, the energy storage circuit and the booster circuit in sequence, and the output end of the over-current detection circuit is connected with the load through the second switch control circuit S2. In the control circuit, the input end of the overvoltage detection circuit is connected with the input end of the overcurrent detection circuit, the output end of the overvoltage detection circuit is connected with the control end of the first switch control circuit S1, and the output end of the overcurrent detection circuit is connected with the control ends of the first switch control circuit S1 and the second switch control circuit S2.
The energy storage circuit is used for storing redundant electric energy when the rotating speed of the generator is high or the generator is overloaded; by utilizing the booster circuit, the previously stored electric energy can be boosted to the required voltage when the rotating speed of the generator is low or the generator stops rotating, so that the power supply time of the generator is prolonged, and the efficiency is improved; by using the overcurrent detection circuit, the load can be cut off when the overload occurs, and the electric energy is stored in the energy storage circuit for subsequent use.
As shown in fig. 2, the circuit structures and principles of the tank circuit, the rectifying-filtering circuit, the boosting circuit, the overvoltage detection circuit, the overcurrent detection circuit, the first switch control circuit S1 and the second switch control circuit S2 are described in turn as follows:
the energy storage circuit comprises a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first reference source U1, a second reference source U2, a third reference source U3, a first resistor R1, a second resistor R2 and a third resistor R3. The cathode of the second capacitor C2 and the anode of the first reference source U1 are grounded respectively, the anode of the second capacitor C2 is divided into two paths, one path is connected with the reference pin of the first reference source U1, the other path is connected with the cathode of the third capacitor C3, one end of a first resistor R1 is connected with the cathode of the first reference source U1, the other end of the first resistor R1 is connected with the reference pin of the first reference source U1 and the anode of the second reference source U2 respectively, the anode of the third capacitor C3 is divided into two paths, one path is connected with the reference pin of the second reference source U2, the other path is connected with the cathode of the fourth capacitor C4, one end of a second resistor R2 is connected with the cathode of the second reference source U2, the other end of the second resistor R2 is connected with the reference pin of the third reference source U3, the anode of the fourth capacitor C4 is connected with the reference pin of the third reference source U3, one end of the third resistor R3 is connected with the cathode of the third reference source U3, the first path is connected with a reference pin of a third reference source U3, the second path is connected with a booster circuit, and the third path is connected with a first switch control circuit S1.
In the energy storage circuit, three capacitors are all farad capacitors, and the models of three reference sources are all TL 431. The withstand voltage value of the energy storage circuit obtained by sequentially connecting the three farad capacitors in series is far higher than that of a single farad capacitor, and when the charging voltage is higher than the reference voltage value inside the TL431, the triode of the output stage of the energy storage circuit is conducted, and the farad capacitor is drained through the branch where the TL431 is located, so that the voltages at two ends of the farad capacitor cannot exceed the withstand voltage value of the farad capacitor.
The rectifying and filtering circuit comprises a first rectifying bridge D1 and a first capacitor C1. The output end of the generator is connected with the alternating current input end of the first rectifier bridge D1, the direct current output end of the first rectifier bridge D1 is connected with the first capacitor C1 in parallel, the negative electrode of the first capacitor C1 is grounded, and the positive electrode of the first capacitor C1 is sequentially connected with the boost circuit and the first switch control circuit S1.
In the rectification filter circuit, the sinusoidal voltage output by the generator is rectified and filtered to obtain pulsating direct-current voltage.
The boost circuit comprises a fourth power management chip U4, a fourth diode D4, a first triode Q1, a first inductor L1, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10. A compensation pin Vc of the fourth power management chip U4 is grounded sequentially through a seventh resistor R7 and a sixth capacitor C6, a feedback pin FB of the fourth power management chip U4 is grounded through a ninth resistor R9, one end of a tenth resistor R10 is connected to a feedback pin FB of the fourth power management chip U4, and the other end is divided into three paths, wherein the first path is connected to the positive electrode of the seventh capacitor C7, the second path is connected to the cathode of a fourth diode D4, the third path is connected to a first switch control circuit S1, a shutdown pin SHDN of the fourth power management chip U4 is respectively connected to one end of a sixth resistor R6 and the collector of the first transistor Q1, the emitter of the first transistor Q1 is grounded, the base of the first transistor Q1 is respectively connected to the output pin LBO of the fourth power management chip U4 and one end of an eighth resistor R8, a ground pin GND terminal of the fourth power management chip U4 is connected to the negative electrode of the seventh capacitor C7, and a ground pin GND terminal of the fourth power management chip 4 is connected to the ground terminal of the fourth power, a switch pin SW of the fourth power management chip U4 is divided into two paths, one path is connected to an anode of a fourth diode D4, the other path is connected to one end of a first inductor L1, the other end of the first inductor L1 is respectively connected to an anode of a fifth capacitor C5, a voltage input pin VIN of the fourth power management chip U4, the other end of an eighth resistor R8, the other end of a sixth resistor R6, and an energy storage circuit, a cathode of the fifth capacitor C5 and one end of a fifth resistor R5 are respectively grounded, the other end of the fifth resistor R5 is divided into two paths, one path is connected to an under-voltage input pin LBI of the fourth power management chip U4, the other path is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is divided into two paths, one path is connected to an anode of a first capacitor C1 in the rectifying and the other path is connected to a first switch control circuit S1.
In the booster circuit, the model of a power management chip is LT1317, a switching tube is embedded in the chip, and the switching tube, a first inductor L1, a fourth diode D4, a fifth capacitor C5 and a seventh capacitor C7 form a Boost circuit. The ninth resistor R9 and the tenth resistor R10 are voltage sampling elements in the feedback loop, and the ratio thereof determines the output voltage of the booster circuit. The seventh resistor R7 and the sixth capacitor C6 compensate the error amplifier inside the chip, and improve the frequency response characteristic. The fourth resistor R4 and the fifth resistor R5 are sampling elements of the direct-current voltage obtained after filtering, when the voltage after filtering is larger than the required output voltage, the undervoltage output pin outputs a low level, the first triode Q1 is cut off, the boosting function of the power management chip is closed, when the voltage after filtering is smaller than the required output voltage, the undervoltage output pin outputs a high level, the first triode Q1 is switched on, the boosting function of the power management chip is switched on, the boosting circuit starts to work, and the voltage in the energy storage circuit is boosted to the required voltage. In addition, the sixth resistor R6 and the eighth resistor R8 are used as pull-up resistors.
The overvoltage detection circuit comprises a third triode Q3, a first voltage regulator tube Z1 and a twelfth resistor R12. The cathode of the first voltage-regulator tube Z1 is divided into two paths, the first path is connected with the first switch control circuit S1, the second path is connected with the overcurrent detection circuit, the anode of the first voltage-regulator tube Z1 is connected with the base electrode of the third triode Q3 through the twelfth resistor R12, the emitting electrode of the third triode Q3 is grounded, and the collector of the third triode Q3 is connected with the first switch control circuit S1.
In the overvoltage detection circuit, when the input voltage exceeds the conduction voltage of the first voltage regulator tube Z1, the third triode Q3 is conducted, and a low-level overvoltage control signal is output to the first switch control circuit S1.
The over-current detection circuit comprises a fourth triode Q4, a fifth triode Q5, a sixth triode Q6, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15. An emitter of the fifth triode Q5 is respectively connected with one end of a fourteenth resistor R14 and a cathode of a first voltage regulator Z1 in the overvoltage detection circuit, the other end of the fourteenth resistor R14 is divided into two paths, one path is connected to an emitter of the sixth triode Q6, the other path is connected with one end of a fifteenth resistor R15, the other end of the fifteenth resistor R15 is divided into three paths, wherein the first path is connected with a switch control circuit S2, the second path is connected with a base of the fifth triode Q5, the third path is connected with a base of a sixth triode Q6, a collector of the sixth triode Q6 is connected with a switch control circuit S2, a collector of the fifth triode Q5 is connected with a base of a fourth triode Q4 through a thirteenth resistor R13, an emitter of the fourth triode Q4 is grounded, and a collector of the fourth triode Q4 is connected with a collector of a third triode Q3 in the overvoltage detection circuit.
In the overcurrent detection circuit, as the output current increases, the voltage across the fourteenth resistor R14 and the fifteenth resistor R15, which are current sampling resistors, increases, and the fifth transistor Q5 and the sixth transistor Q6 are sequentially turned on. After the fifth triode Q5 is turned on, the fourth triode Q4 is also turned on, and outputs a low-level overcurrent control signal to the first switch control circuit S1; when the sixth transistor Q6 is turned on, the voltage between the emitter and the collector of the sixth transistor Q6 becomes small, and a high level overcurrent control signal is output to the second switch control circuit S2.
The first switch control circuit S1 includes a second MOS transistor Q2, a third diode D3, an eleventh resistor R11, and a fifth cascode diode D5. The cathode of the third diode D3 is connected to the third resistor R3 in the energy storage circuit and the sixth resistor R6 in the voltage boost circuit, the anode of the third diode D3 is connected to the drain of the second MOS transistor Q2, the gate of the second MOS transistor Q2 is connected to one end of the eleventh resistor R11 and the collector of the third triode Q3 in the overvoltage detection circuit, the source of the second MOS transistor Q2 is connected to the other end of the eleventh resistor R11 and one anode of the fifth cascode diode D5, the other anode of the fifth cascode diode D5 is connected to the anode of the seventh capacitor C7 in the voltage boost circuit, and the cathode of the fifth cascode diode D5 is connected to the cathode of the first voltage regulator Z1 in the overvoltage detection circuit.
In the first switch control circuit S1, when the dc voltage obtained after rectification and filtering is high, the upper tube of the fifth cascode diode D5 is turned on, the lower tube is turned off, the rectified and filtered electric energy is directly sent to the load through the upper tube, when the voltage on the filter capacitor drops to some extent, the lower tube of the fifth cascode diode D5 is turned on, the upper tube is turned off, the electric energy in the energy storage circuit is boosted by the boost circuit and then sent to the load, so as to ensure that the supply voltage obtained by the load in the whole operating time is kept within an appropriate range; when the input voltage is too high or the output current is too large, the gate of the second MOS transistor Q2 is pulled to a low level, a current flows across the eleventh resistor R11, when the voltage across the eleventh resistor R11 is greater than the MOS transistor turn-on threshold, the second MOS transistor Q2 is turned on, and the rectified and filtered electric energy is sent to the energy storage circuit to store the redundant electric energy.
The second switch control circuit S2 includes a seventh MOS transistor Q7 and a sixteenth resistor R16. The source electrode of the seventh MOS tube is connected with the base electrode of a fifth triode Q5 in the overcurrent detection circuit, the grid electrode of the seventh MOS tube is divided into two paths, one path is connected with the collector electrode of a sixth triode Q6 in the overcurrent detection circuit, the other path is grounded through a sixteenth resistor R16, and the load is connected between the drain electrode of the seventh MOS tube and the ground in parallel.
In the second switch control circuit S2, when the output current is too large, the gate potential of the seventh MOS transistor Q7 is raised to correspond to the source, and the seventh MOS transistor Q7 is turned off, disconnecting the load from the main circuit.
In the previous stage of the work of the generator (the rotating speed is higher at the moment), the electric energy obtains higher direct-current voltage after passing through the rectifying and filtering circuit, the booster circuit does not work, the overvoltage detection circuit outputs a control signal to enable the second MOS tube Q2 to be conducted, at the moment, a part of electric energy is sequentially transmitted to a load through the current detection circuit and the seventh MOS tube Q7, and the other part of electric energy is transmitted to the energy storage circuit through the second MOS tube Q2; in the later stage of the power generation device (at the moment, the rotating speed is lower or the power generation device stops rotating), the direct-current voltage obtained after rectification and filtration is lower, the booster circuit works and boosts the electric energy in the energy storage circuit to the required voltage under the action of the booster circuit, the overvoltage detection circuit outputs a control signal to turn off the second MOS tube Q2, and the electric energy is sequentially sent to a load through the energy storage circuit, the booster circuit, the overcurrent detection circuit and the seventh MOS tube Q7; in addition, when the load is in overcurrent or short circuit, the overcurrent detection circuit outputs a control signal to enable the second MOS tube Q2 to be conducted and the seventh MOS tube Q7 to be disconnected, the load is disconnected from the main circuit, and all electric energy is transmitted to the energy storage circuit.
Claims (5)
1. An overflow energy storage power supply circuit, characterized by: the energy storage circuit comprises an energy storage circuit, a rectifying and filtering circuit, a booster circuit, an overvoltage detection circuit, an overcurrent detection circuit, a first switch control circuit S1 and a second switch control circuit S2;
the output end of the generator is connected to the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is divided into two paths, one path is directly connected with the input end of the over-current detection circuit, the other path is connected with the input end of the over-current detection circuit through the first switch control circuit S1, the energy storage circuit and the booster circuit in sequence, and the output end of the over-current detection circuit is connected with a load through the second switch control circuit S2; the input end of the overvoltage detection circuit is connected with the input end of the overcurrent detection circuit, the output end of the overvoltage detection circuit is connected with the control end of the first switch control circuit S1, and the output end of the overcurrent detection circuit is connected with the control ends of the first switch control circuit S1 and the second switch control circuit S2;
the energy storage circuit stores redundant electric energy when the rotating speed of the generator is high or the generator is overloaded;
when the rotating speed of the generator is low or the generator stops rotating, the booster circuit boosts the previously stored electric energy to the required voltage so as to prolong the power supply time of the generator and improve the efficiency;
the overcurrent detection circuit cuts off the load when the overload occurs, and the electric energy is stored in the energy storage circuit for subsequent use.
2. The overflow energy storage power supply circuit of claim 1, wherein: the energy storage circuit comprises a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first reference source U1, a second reference source U2, a third reference source U3, a first resistor R1, a second resistor R2 and a third resistor R3; the common end of the cathode of the second capacitor C2 and the anode of the first reference source U1 is grounded, the anode of the second capacitor C2 is divided into two paths, one path is connected with the reference pin of the first reference source U1, the other path is connected with the cathode of the third capacitor C3, one end of the first resistor R1 is connected with the cathode of the first reference source U1, the other end of the first resistor R3638 is connected with the reference pin of the first reference source U1, the common end of the anode of the second reference source U2 is connected with the reference pin of the first reference source U1, the anode of the third capacitor C3 is divided into two paths, one path is connected with the reference pin of the second reference source U2, the other path is connected with the cathode of the fourth capacitor C4, one end of the second resistor R2 is connected with the cathode of the second reference source U2, the other end of the second reference source U2 is connected with the reference pin of the third reference source U2, one end of the anode of the third resistor R3 is connected with the cathode 3 of the third reference source U36, the other end is divided into three paths, the first path is connected with the anode of a fourth capacitor C4, the second path is connected with a booster circuit, and the third path is connected with the first path.
3. The overflow energy storage power supply circuit of claim 2, wherein: the three capacitors are all farad capacitors, and the model of the three reference sources is TL 431.
4. The overflow energy storage power supply circuit of claim 3, wherein: the withstand voltage value of the energy storage circuit obtained by sequentially connecting the three farad capacitors in series is far higher than that of a single farad capacitor, and when the charging voltage is higher than the reference voltage value inside the TL431, the triode of the output stage of the energy storage circuit is conducted, and the farad capacitor is drained through the branch where the TL431 is located, so that the voltages at two ends of the farad capacitor cannot exceed the withstand voltage value of the farad capacitor.
5. The overflow energy storage power supply circuit of claim 1, wherein: the boost circuit comprises a fourth power management chip U4, a fourth diode D4, a first triode Q1, a first inductor L1, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10; the power management chip is LT1317, a switch tube is embedded in the chip, and the switch tube, a first inductor L1, a fourth diode D4, a fifth capacitor C5 and a seventh capacitor C7 form a Boost circuit; the ninth resistor R9 and the tenth resistor R10 are voltage sampling elements in the feedback loop, and the ratio of the voltage sampling elements determines the output voltage of the booster circuit; the seventh resistor R7 and the sixth capacitor C6 compensate the error amplifier inside the chip, and the frequency response characteristic of the error amplifier is improved; the fourth resistor R4 and the fifth resistor R5 are sampling elements of the direct-current voltage obtained after filtering, when the voltage after filtering is larger than the required output voltage, the undervoltage output pin outputs a low level, the first triode Q1 is cut off, the boosting function of the power management chip is closed, when the voltage after filtering is smaller than the required output voltage, the undervoltage output pin outputs a high level, the first triode Q1 is switched on, the boosting function of the power management chip is switched on, the boosting circuit starts to work, and the voltage in the energy storage circuit is boosted to the required voltage; in addition, the sixth resistor R6 and the eighth resistor R8 are used as pull-up resistors.
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| CN113472048A (en) * | 2021-07-30 | 2021-10-01 | 阳光电源股份有限公司 | Startup and shutdown control system and switching power supply system |
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