CN213637536U - AC-DC isolation power supply chip, application circuit thereof and charging circuit - Google Patents
AC-DC isolation power supply chip, application circuit thereof and charging circuit Download PDFInfo
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- CN213637536U CN213637536U CN202023101414.3U CN202023101414U CN213637536U CN 213637536 U CN213637536 U CN 213637536U CN 202023101414 U CN202023101414 U CN 202023101414U CN 213637536 U CN213637536 U CN 213637536U
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Abstract
The utility model provides a power chip is kept apart to AC-DC and application circuit and charging circuit thereof for be connected with the transformer, including the chip body, the chip body is provided with in the chip body: the rectifying circuit is used for connecting high-voltage alternating current and rectifying the high-voltage alternating current into high-voltage direct current; the high-voltage power taking circuit is used for converting high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip; the output driving circuit is used for driving the transformer to work; a logic processing circuit for outputting a drive control signal to the drive circuit; the rectification circuit is connected with the alternating current power supply, the transformer and the high-voltage power-taking circuit, the high-voltage power-taking circuit is further connected with the logic processing circuit and the driving circuit, the logic processing circuit is further connected with the driving circuit, and the driving circuit is further connected with the transformer. The utility model discloses an it is integrated in same chip with former limit device, only realize the former limit power supply of transformer and drive through chip and transformer, reduced former limit device of transformer, retrencied circuit structure.
Description
Technical Field
The utility model relates to a power chip field, in particular to AC-DC keeps apart power chip and application circuit and charging circuit thereof.
Background
In the existing isolated switching power supply chip, half-wave or full-wave rectification is generally carried out on high-voltage alternating current through a diode or a bridge stack, filtering is carried out through a high-voltage capacitor, then the high-voltage alternating current is input into the chip and is rectified, filtered and supplied with power through a transformer feedback winding, finally PWM is generated to control a high-voltage tube to carry out switching modulation, and then spike pulses of the high-voltage power tube are regulated, output and absorbed through a feedback resistor. However, the method has many primary devices and complicated circuit.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide an AC-DC isolated power chip, and an application circuit and a charging circuit thereof, which integrate a primary device on a same chip, and only realize primary power supply and driving of a transformer through the chip and the transformer, thereby reducing the primary device of the transformer and simplifying the circuit structure.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a power chip is kept apart to AC-DC for be connected with the transformer, including the chip body, be provided with in the chip body:
the rectifying circuit is used for connecting high-voltage alternating current and rectifying the high-voltage alternating current into high-voltage direct current;
the high-voltage power taking circuit is used for converting the high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip;
the output driving circuit is used for driving the transformer to work;
a logic processing circuit for outputting a drive control signal to the drive circuit;
the rectifier circuit is connected with an alternating current power supply, a transformer and a high-voltage power-taking circuit, the high-voltage power-taking circuit is further connected with a logic processing circuit and a driving circuit, the logic processing circuit is further connected with the driving circuit, and the driving circuit is further connected with the transformer.
The AC-DC isolated power supply chip further comprises:
the feedback circuit is used for sampling a signal of the transformer to generate sampling voltage;
the error amplifying circuit is used for receiving the sampling voltage and amplifying the sampling voltage;
the feedback circuit is connected with the transformer and the error amplifying circuit, and the error amplifying circuit is also connected with the logic processing circuit.
The AC-DC isolated power supply chip further comprises:
the overcurrent protection circuit is respectively connected with the output drive circuit and the logic processing circuit and is used for carrying out overcurrent protection on the chip;
and the AC-DC is connected with the logic processing circuit and is used for carrying out over-temperature protection on the chip.
The AC-DC isolated power supply chip further comprises:
and the oscillating circuit is connected with the logic processing circuit and is used for providing low-frequency oscillation for the logic processing circuit.
Be provided with five or six pins on the chip body, be respectively: a first pin, a second pin (reserved), a third pin, a fourth pin, a fifth pin and a sixth pin;
the first pin is connected with the feedback circuit and used for sampling signals;
the second pin is a reserved pin;
the third pin is connected with the output driving circuit and used for driving an external device;
the fourth pin is connected with the output end of the rectifying circuit and used for outputting high-voltage direct current;
the fifth pin is connected with the input end of the rectifying circuit and used for accessing high-voltage alternating current;
the sixth pin is a chip grounding pin.
The high-voltage power taking circuit comprises:
a voltage conversion circuit for converting the high voltage direct current to a low voltage direct current;
the controllable high-voltage MOS circuit is used for accessing the low-voltage direct current;
the voltage sampling circuit is used for sampling the voltage of the low-voltage direct current;
the voltage regulating circuit is used for converting the low-voltage direct current into power supply voltage inside the chip;
an operational amplifier for feedback regulation;
the input end of the voltage conversion circuit is connected with the output end of the rectification circuit, the output end of the voltage conversion circuit is connected with the input end of the controllable high-voltage MOS circuit, the output end of the controllable high-voltage MOS circuit is connected with the voltage sampling circuit and the voltage regulation circuit, the voltage sampling circuit is further connected with the reverse input end of the operational amplifier, the voltage regulation circuit is further connected with the positive input end of the operational amplifier, and the output end of the operational amplifier is connected with the control end of the controllable high-voltage MOS circuit.
The voltage conversion circuit comprises a high-voltage JFET tube, and the controllable high-voltage MOS circuit comprises a first transistor; the high-voltage direct current is converted into low-voltage direct current by the high-voltage JFET tube and transmitted to the first transistor, and then the low-voltage direct current is accessed by the first transistor and input protection is provided for a rear-stage circuit.
An application circuit of an AC-DC isolation power supply chip comprises a transformer for voltage conversion, an output circuit for rectifying and filtering the output voltage of the transformer, and the AC-DC isolation power supply chip;
the first end of the primary side main winding of the transformer is connected with the fourth pin, the second end of the primary side main winding of the transformer is connected with the third pin, the first end of the feedback winding of the transformer is connected with the first pin, the second end of the feedback winding of the transformer is grounded, and the first end and the second end of the secondary side winding of the transformer are both connected with the output circuit.
The output circuit comprises a first diode, a first resistor and a first capacitor, wherein the input end of the first diode is connected with the first end of the secondary winding of the transformer, the output end of the first diode is connected with one end of the first capacitor and one end of the first resistor and supplies power for an output end device, and the second end of the secondary winding of the transformer is connected with the other end of the first capacitor and the other end of the first resistor and is grounded.
A charging circuit, comprising:
a charging chip for charging the battery;
a first indicator light and a second indicator light for indicating a charging state;
and an application circuit of the AC-DC isolated power supply chip;
the power input end of the charging chip is connected with the first end of the secondary winding of the transformer and the output circuit, the charging positive end of the charging chip is connected with the power positive electrode of the battery, the charging negative end of the charging chip is connected with the power negative electrode of the battery, and the first indicating end and the second indicating end of the charging chip are respectively connected with the first indicating lamp and the second indicating lamp.
Compared with the prior art, the utility model provides a power chip is kept apart to AC-DC for be connected with the transformer, including the chip body, be provided with in the chip body: the rectifying circuit is used for connecting high-voltage alternating current and rectifying the high-voltage alternating current into high-voltage direct current; the high-voltage power taking circuit is used for converting the high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip; the output driving circuit is used for driving the transformer to work; a logic processing circuit for outputting a drive control signal to the drive circuit; the rectifier circuit is connected with an alternating current power supply, a transformer and a high-voltage power-taking circuit, the high-voltage power-taking circuit is further connected with a logic processing circuit and a driving circuit, the logic processing circuit is further connected with the driving circuit, and the driving circuit is further connected with the transformer. The utility model discloses an it is integrated in same chip with former limit device, only realize the former limit power supply of transformer and drive through chip and transformer, reduced former limit device of transformer, retrencied circuit structure.
Drawings
Fig. 1 is a block diagram of the AC-DC isolated power supply chip provided by the present invention;
fig. 2 is a schematic circuit diagram of a high-voltage power-taking circuit provided by the present invention;
fig. 3 is a pin diagram of the AC-DC isolated power chip provided by the present invention;
fig. 4 is a circuit diagram of an application circuit of the AC-DC isolated power supply chip provided by the present invention;
fig. 5 is a circuit diagram of a charging circuit provided by the present invention.
Detailed Description
The utility model provides a AC-DC keeps apart power chip and application circuit and charging circuit thereof through with former limit device integration in same chip, only realizes the former limit power supply of transformer and drive through chip and transformer, has reduced former limit device of transformer, has retrencied circuit structure.
The present invention is described in more detail in order to facilitate the explanation of the technical idea, the technical problem solved, the technical features of the technical solution, and the technical effects brought by the present invention. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
For the convenience of understanding the embodiments of the present application, relevant elements related to the embodiments of the present application will be described first.
Referring to fig. 1, the present invention provides an AC-DC isolated power chip U1 for connecting with a transformer T1A, including a chip body 10, the chip body 10, wherein the chip body 10 is provided with: a rectifier circuit 100 for receiving and rectifying the high-voltage alternating current into high-voltage direct current; the high-voltage power taking circuit 200 is used for converting the high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip; an output driving circuit 400 for driving the transformer T1A to operate; a logic processing circuit 300 for outputting a drive control signal to the drive circuit; the rectifier circuit 100 is connected with an alternating current power supply, a transformer T1A and a high-voltage power-taking circuit 200, the high-voltage power-taking circuit 200 is further connected with a logic processing circuit 300 and a driving circuit, the logic processing circuit 300 is further connected with the driving circuit, and the driving circuit is further connected with the transformer T1A.
In specific implementation, the AC-DC isolation power chip U1 in this embodiment may be connected to a mains supply or another high-voltage alternating current, the input end of the rectification circuit 100 is connected to a live wire of a high-voltage alternating current power supply to access the high-voltage alternating current, and then the high-voltage alternating current is rectified into a high-voltage direct current to be output to the high-voltage power circuit 200 and the transformer T1A outside the chip. The high-voltage de-dotting circuit converts the high-voltage direct current into low-voltage direct current, converts the low-voltage alternating current into a chip internal power supply voltage VDD and supplies power to each device in the chip; for example, the output driving circuit 400 and the logic processing circuit 300 both need the chip internal power supply voltage for power supply. When the logic circuit is powered on, a driving control signal is output to the output driving circuit 400, the driving control circuit receives the driving control signal and then outputs the driving signal to drive the transformer T1A to work, the transformer T1A converts the high-voltage direct current into corresponding external power supply voltage, and external devices supply power. In this embodiment, the primary side devices are integrated in the same chip, and the primary side power supply of the transformer T1A is realized only by the chip and the transformer T1A, so that the primary side devices of the transformer T1A are reduced while the function of the switching power supply is realized, and the circuit structure is simplified.
Specifically, with reference to fig. 1, the AC-DC isolated power chip U1 further includes: a feedback circuit 500 for sampling the signal of the transformer T1A to generate a sampled voltage; an error amplifying circuit 600 for receiving the sampling voltage and amplifying the sampling voltage; the feedback circuit 500 is connected to the transformer T1A and the error amplifier circuit 600, and the error amplifier circuit 600 is further connected to the logic processing circuit 300.
In specific implementation, in this embodiment, in the transformer T1A having a feedback winding, the feedback circuit 500 is connected to the feedback winding of the transformer T1A, and samples the signal of the feedback winding, and then outputs the obtained sampled voltage to the error amplifier for amplification to obtain a feedback signal, and finally outputs the feedback signal to the logic processing circuit 300, and the logic processing circuit 300 outputs a corresponding driving control signal according to the feedback signal to control the on/off of the output driving circuit 400, so as to control the operating state (on or off) of the transformer T1A, thereby implementing the feedback regulation function.
Specifically, with reference to fig. 1, the AC-DC isolated power chip U1 further includes: an overcurrent protection circuit 700 for overcurrent protection of the chip; the over-current protection circuit 700 is connected to the output driver circuit 400 and the logic processing circuit 300, respectively.
In specific implementation, in this embodiment, the over-current protection circuit 700 is connected between the logic processing circuit 300 and the output driving circuit 400, and performs sampling analysis on the current of the output driving circuit 400; when the current of the output driving circuit 400 is greater than a set value, an overcurrent feedback signal is output to the logic processing circuit 300, and the logic processing circuit 300 outputs a driving control signal to close the driving switch of the output driving circuit 400, so that the transformer T1A stops working, and an overcurrent protection function is achieved.
Specifically, with reference to fig. 1, the AC-DC isolated power chip U1 further includes: and an over-temperature protection circuit 800 connected to the logic processing circuit 300 and configured to perform over-temperature protection on the chip.
In specific implementation, in this embodiment, the over-temperature protection circuit 800 detects a chip temperature, a temperature analysis circuit is disposed inside the chip, when the temperature in the AC-DC isolated power chip U1 is higher than a preset value, an over-temperature feedback signal is output to the logic processing circuit 300, and after receiving the over-temperature feedback signal, the logic processing circuit 300 outputs a driving control signal to turn off a driving switch of the output driving circuit 400, so that the transformer T1A stops working, and plays a role of over-temperature protection.
Specifically, with reference to fig. 1, the AC-DC isolated power chip U1 further includes: and an oscillation circuit 900 connected to the logic processing circuit 300 for providing low frequency oscillation to the logic processing circuit 300. In this embodiment, the oscillation circuit 900 is an RC oscillation circuit 900, which provides low-frequency oscillation for the logic processing circuit 300, so that the logic processing circuit 300 works normally.
Specifically, referring to fig. 2, the high voltage power-taking circuit 200 includes: a voltage conversion circuit 204 for converting the high voltage dc power to low voltage dc power; a controllable high-voltage MOS circuit 205 for accessing the low-voltage direct current; a voltage sampling circuit 201 for sampling the voltage of the low-voltage direct current; a voltage regulating circuit 202 for converting the low-voltage direct current into a power supply voltage inside the chip; an operational amplifier 203 for feedback adjustment; the input end of the voltage conversion circuit 204 is connected with the output end of the rectification circuit 100, the output end of the voltage conversion circuit 204 is connected with the input end of the controllable high-voltage MOS circuit 205, the output end of the controllable high-voltage MOS circuit 205 is connected with the voltage sampling circuit 201 and the voltage regulation circuit 202, the voltage sampling circuit 201 is further connected with the reverse input end of the operational amplifier 203, the voltage regulation circuit 202 is further connected with the positive input end of the operational amplifier 203, and the output end of the operational amplifier 203 is connected with the control end of the controllable high-voltage MOS circuit 205.
In specific implementation, in this embodiment, the voltage conversion circuit is connected to the high-voltage direct current obtained after rectification by the rectification circuit, converts the high-voltage direct current into low-voltage direct current, and outputs the low-voltage direct current to the controllable high-voltage MOS circuit. The controllable high-voltage MOS circuit receives the low-voltage direct current and outputs the low-voltage direct current to the voltage sampling circuit and the voltage regulating circuit, finally the voltage regulating circuit obtains the power supply Voltage (VDD) inside the chip to supply power for each circuit inside the chip, and meanwhile the power supply voltage inside the chip is used as a feedback signal of the operational amplifier to achieve feedback regulation.
Specifically, the voltage conversion circuit comprises a high-voltage JFET tube Q2, and the controllable high-voltage MOS circuit comprises a first transistor Q1; the high-voltage direct current is converted into low-voltage direct current by the high-voltage JFET tube Q2 and transmitted to the first transistor, and then the low-voltage direct current is accessed by the first transistor and input protection is provided for a rear-stage circuit.
In this embodiment, the high-voltage direct current is connected to the source of the high-voltage JFET Q2 (high-voltage JFET), and the low-voltage direct current is output from the high-voltage JFET Q2 to the drain of the first transistor Q1 according to the characteristics of the JFET. The first transistor Q1 is a depletion type MOS field effect transistor, and as the depletion type MOS transistor is a normally closed device, the grid is in a conducting state when no voltage is applied; therefore, the high-voltage direct current is accessed from the drain electrode of the first transistor Q1 and can be directly transmitted to the source electrode; and after the sampling by the voltage sampling circuit 201 and the adjustment by the voltage adjusting circuit 202, the signals are respectively output to the operational amplifier 203, a feedback loop is formed by the operational amplifier 203 and the gate of the first transistor Q1, the source current of the first transistor Q1 is adjusted, the required low-voltage direct current is obtained after the stable feedback adjustment is stable, the internal power supply voltage of the chip is obtained by the voltage adjusting circuit, and the internal power supply voltage of the chip is used as the feedback reference voltage of the operational amplifier 203. According to the feedback loop regulation in the embodiment, even if the voltage output by the first transistor Q1 is extremely low, the source still has enough power supply capability, so the AC-DC isolated power supply chip U1 can work normally from extremely low voltage to high voltage, thereby eliminating the high-voltage filter capacitor, simplifying the structure, reducing the cost and improving the performance.
Specifically, referring to fig. 3, five or six pins are disposed on the chip body 10; when the number of the pins is six, the number is respectively as follows: a first pin FB, a second pin NC (spare), a third pin D, a fourth pin DC, a fifth pin AC and a sixth pin GND; when the number of the pins is five, the pins are respectively a first pin FB, a third pin D, a fourth pin DC, a fifth pin AC and a sixth pin GND; the first pin FB is connected to the feedback circuit 500, and is configured to sample a signal; the second pin NC is a reserved pin; the third pin D is connected to the output driving circuit 400, and is used for driving an external device; the fourth pin DC is connected to the output end of the rectifier circuit 100 and is used for outputting high-voltage direct current; the fifth pin AC is connected to the input end of the rectifier circuit 100 and is used for receiving high-voltage alternating current; and the sixth pin GND is a chip grounding pin.
In specific implementation, in this embodiment, the first pin FB is a feedback pin, the second pin NC is a reserved pin, the third pin D is a driving pin, the fourth pin DC is a DC output pin, the fifth pin AC is an AC access pin, and the sixth pin GND is a chip ground pin. When the chip is used, high-voltage alternating current is accessed through the fifth pin AC, and after being converted by the internal rectifying circuit 100, high-voltage direct current is output from the fourth pin DC; meanwhile, a high-voltage power taking circuit 200 in the chip receives and also obtains the high-voltage direct current as input, converts the high-voltage direct current into low-voltage direct current and then generates power supply voltage in the chip to supply power for other circuits in the chip; after the logic processing circuit 300 is powered on, a driving control signal is output to the output driving circuit 400, so that the driving circuit is started to control the transformer T1A to work; the first pin FB is connected to a feedback winding of the transformer T1A to obtain a feedback signal, and the logic processing circuit 300 controls the switch of the output driving circuit 400 according to the feedback signal to implement the function of a controllable high-voltage MOS circuit.
Based on the AC-DC isolation power chip U1, please refer to fig. 4, the present invention further provides an application circuit of the AC-DC isolation power chip U1, including a transformer T1A for voltage conversion, an output circuit for rectifying and filtering the output voltage of the transformer T1A, and the AC-DC isolation power chip U1 as described above;
the first end of the primary side main winding of the transformer T1A is connected to the fourth pin DC, the second end of the primary side main winding of the transformer T1A is connected to the third pin D, the first end of the feedback winding of the transformer T1A is connected to the first pin FB, the second end of the feedback winding of the transformer T1A is grounded, and the first end and the second end of the secondary side winding of the transformer T1A are both connected to the output circuit.
In specific implementation, in this embodiment, the primary side of the transformer T1A is only the AC-DC isolation power chip U1, the primary side of the transformer T1A directly takes power from the AC-DC isolation power chip U1, and the AC-DC isolation power chip U1 controls the operating state of the transformer T1A, so that a corresponding switching power supply function can be implemented without adding an additional device to the primary side of the transformer T1A, a circuit structure is simplified, and cost is reduced. Since the AC-DC isolated power chip U1 has been described in detail above, it is not described in detail here.
Specifically, the output circuit includes a first diode D1, a first resistor R1 and a first capacitor C1, an input end of the first diode D1 is connected to a first end of a secondary winding of the transformer T1A, an output end of the first diode D1 is connected to one end of the first capacitor C1 and one end of the first resistor R1 and supplies power to an output device, and a second end of the secondary winding of the transformer T1A is connected to the other end of the first capacitor C1 and the other end of the first resistor R1 and is grounded. In this embodiment, the first diode D1 prevents voltage kickback of the subsequent circuit, and the first capacitor C1 and the first resistor R1 form a filter circuit to filter the output of the transformer T1A.
Based on the application circuit of the AC-DC isolated power chip U1, please refer to fig. 5, the present invention further provides a charging circuit, including: a charging chip U2 for charging the battery; a first indicator lamp L1 and a second indicator lamp L2 for indicating a state of charge; and the application circuit of the AC-DC isolated power chip U1; the power input end VCC of the charging chip U2 and the first end and the output circuit of the secondary winding of the transformer T1A are connected, the charging positive terminal BTP of the charging chip U2 and the power positive terminal of the battery are connected, the charging negative terminal BTN of the charging chip U2 and the power negative terminal of the battery are connected, the first indication terminal LED1 and the second indication terminal LED2 of the charging chip U2 respectively and the first indicator light L1 and the second indicator light L2 are connected. Specifically, in this embodiment, the display device further includes a second capacitor C2, the second capacitor C2 is connected to the output terminal of the first indicator light and the output terminal of the second indicator light, and the other end of the second capacitor C2 is grounded.
In specific implementation, in this embodiment, the power input VCC of the charging chip U2 is connected to the output voltage of the transformer T1A, and is connected to the positive and negative electrodes of the battery after internal processing of the chip, so as to charge the battery, and the charging status (charging, charging completion, etc.) is indicated by the first indicator light L1 and the second indicator light L2. Specifically, the model of the charging chip U2 is 3582. Since the application circuit of the AC-DC isolated power chip U1 has been described in detail above, and the charging method is prior art, it is not described herein again.
To sum up, the utility model provides a pair of AC-DC keeps apart power chip for be connected with the transformer, including the chip body, be provided with in the chip body: the rectifying circuit is used for connecting high-voltage alternating current and rectifying the high-voltage alternating current into high-voltage direct current; the high-voltage power taking circuit is used for converting the high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip; the output driving circuit is used for driving the transformer to work; a logic processing circuit for outputting a drive control signal to the drive circuit; the rectifier circuit is connected with an alternating current power supply, a transformer and a high-voltage power-taking circuit, the high-voltage power-taking circuit is further connected with a logic processing circuit and a driving circuit, the logic processing circuit is further connected with the driving circuit, and the driving circuit is further connected with the transformer. The utility model discloses an it is integrated in same chip with former limit device, only realize the former limit power supply of transformer and drive through chip and transformer, reduced former limit device of transformer, retrencied circuit structure.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (10)
1. The utility model provides a AC-DC isolated power supply chip which characterized in that for be connected with the transformer, includes the chip body, be provided with in the chip body:
the rectifying circuit is used for connecting high-voltage alternating current and rectifying the high-voltage alternating current into high-voltage direct current;
the high-voltage power taking circuit is used for converting the high-voltage direct current into low-voltage direct current and generating power supply voltage inside the chip;
the output driving circuit is used for driving the transformer to work;
a logic processing circuit for outputting a drive control signal to the drive circuit;
the rectifier circuit is connected with an alternating current power supply, a transformer and a high-voltage power-taking circuit, the high-voltage power-taking circuit is further connected with a logic processing circuit and a driving circuit, the logic processing circuit is further connected with the driving circuit, and the driving circuit is further connected with the transformer.
2. The AC-DC isolated power supply chip of claim 1, further comprising:
the feedback circuit is used for sampling a signal of the transformer to generate sampling voltage;
the error amplifying circuit is used for receiving the sampling voltage and amplifying the sampling voltage;
the feedback circuit is connected with the transformer and the error amplifying circuit, and the error amplifying circuit is also connected with the logic processing circuit.
3. The AC-DC isolated power supply chip of claim 2, further comprising:
the overcurrent protection circuit is connected with the output drive circuit and the logic processing circuit and is used for carrying out overcurrent protection on the chip;
and the over-temperature protection circuit is connected with the logic processing circuit and is used for performing over-temperature protection on the chip.
4. The AC-DC isolated power supply chip of claim 3, wherein the AC-DC isolated power supply chip further comprises:
and the oscillating circuit is connected with the logic processing circuit and is used for providing low-frequency oscillation for the logic processing circuit.
5. The AC-DC isolated power supply chip according to claim 4, wherein the chip body is provided with five or six pins; when the number of the pins is six, the number is respectively as follows: a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin; when the number of the pins is five, the pins are respectively a first pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
the first pin is connected with the feedback circuit and used for sampling signals;
the second pin is a reserved pin;
the third pin is connected with the output driving circuit and used for driving an external device;
the fourth pin is connected with the output end of the rectifying circuit and used for outputting high-voltage direct current;
the fifth pin is connected with the input end of the rectifying circuit and used for accessing high-voltage alternating current;
the sixth pin is a chip grounding pin.
6. The AC-DC isolated power supply chip according to claim 5, wherein the high voltage power supply circuit comprises:
a voltage conversion circuit for converting the high voltage direct current to a low voltage direct current;
the controllable high-voltage MOS circuit is used for accessing the low-voltage direct current;
the voltage sampling circuit is used for sampling the voltage of the low-voltage direct current;
the voltage regulating circuit is used for converting the low-voltage direct current into power supply voltage inside the chip;
an operational amplifier for feedback regulation;
the input end of the voltage conversion circuit is connected with the output end of the rectification circuit, the output end of the voltage conversion circuit is connected with the input end of the controllable high-voltage MOS circuit, the output end of the controllable high-voltage MOS circuit is connected with the voltage sampling circuit and the voltage regulation circuit, the voltage sampling circuit is also connected with the reverse input end of the operational amplifier, the voltage regulation circuit is also connected with the positive input end of the operational amplifier, and the output end of the operational amplifier is connected with the control end of the controllable high-voltage MOS circuit.
7. The AC-DC isolated power supply chip of claim 6, wherein said voltage conversion circuit comprises a high voltage JFET transistor, and said controllable high voltage MOS circuit comprises a first transistor; the high-voltage direct current is converted into low-voltage direct current by the high-voltage JFET tube and transmitted to the first transistor, and then the low-voltage direct current is accessed by the first transistor and input protection is provided for a rear-stage circuit.
8. An application circuit of an AC-DC isolated power chip, which is characterized by comprising a transformer for voltage conversion, an output circuit for rectifying and filtering the output voltage of the transformer, and the AC-DC isolated power chip as claimed in claim 7;
the first end of the primary side main winding of the transformer is connected with the fourth pin, the second end of the primary side main winding of the transformer is connected with the third pin, the first end of the feedback winding of the transformer is connected with the first pin, the second end of the feedback winding of the transformer is grounded, and the first end and the second end of the secondary side winding of the transformer are both connected with the output circuit.
9. The application circuit of the AC-DC isolated power supply chip as recited in claim 8, wherein the output circuit comprises a first diode, a first resistor and a first capacitor, an input terminal of the first diode is connected to a first terminal of the secondary winding of the transformer, an output terminal of the first diode is connected to one terminal of the first capacitor and one terminal of the first resistor and supplies power to an output device, and a second terminal of the secondary winding of the transformer is connected to the other terminal of the first capacitor and the other terminal of the first resistor and is grounded.
10. A charging circuit, comprising:
a charging chip for charging the battery;
a first indicator light and a second indicator light for indicating a charging state;
and an application circuit of the AC-DC isolated power supply chip of claim 8;
the power input end of the charging chip is connected with the first end of the secondary winding of the transformer and the output circuit, the charging positive end of the charging chip is connected with the power positive electrode of the battery, the charging negative end of the charging chip is connected with the power negative electrode of the battery, and the first indicating end and the second indicating end of the charging chip are respectively connected with the first indicating lamp and the second indicating lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023101414.3U CN213637536U (en) | 2020-12-21 | 2020-12-21 | AC-DC isolation power supply chip, application circuit thereof and charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023101414.3U CN213637536U (en) | 2020-12-21 | 2020-12-21 | AC-DC isolation power supply chip, application circuit thereof and charging circuit |
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| CN213637536U true CN213637536U (en) | 2021-07-06 |
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| CN202023101414.3U Active CN213637536U (en) | 2020-12-21 | 2020-12-21 | AC-DC isolation power supply chip, application circuit thereof and charging circuit |
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| Country | Link |
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| CN (1) | CN213637536U (en) |
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