CN218733889U - Switching power supply circuit and charger thereof - Google Patents
Switching power supply circuit and charger thereof Download PDFInfo
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- CN218733889U CN218733889U CN202223130974.0U CN202223130974U CN218733889U CN 218733889 U CN218733889 U CN 218733889U CN 202223130974 U CN202223130974 U CN 202223130974U CN 218733889 U CN218733889 U CN 218733889U
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Abstract
The utility model relates to the technical field of chargers, and discloses a switching power supply circuit and a charger thereof, which comprises a rectifier bridge BD1, wherein a second pin of the rectifier bridge BD1 is connected with the anode of a first electrolytic capacitor CE1, and the cathode of the first electrolytic capacitor CE1 is grounded; the positive electrode of the first electrolytic capacitor CE1 is connected with a first pin of the transformer T1, the cathode of the first diode D1 is respectively connected with one end of the third capacitor C3 and one end of the fourth resistor R4, and the other end of the third capacitor C3 and the other end of the fourth resistor R4 are both connected with the positive electrode of the first electrolytic capacitor CE 1. The utility model discloses a switching power supply and charger thereof can restrain reverse peak voltage, and the direct current voltage ripple of output is little, and output power supply stability is good, can quick charge, and the high quality, and circuit structure is simple, and is with low costs, easily the factory production manufacturing.
Description
Technical Field
The utility model relates to a charger technical field specifically is a switching power supply circuit and charger thereof.
Background
The switch power supply is a power supply which utilizes the modern power electronic technology to control the time proportion of the on and off of a switch tube and maintain stable output voltage. Switching power supplies have the advantages of simple structure, small size, light weight, high efficiency, and convenience in use, and are also currently used in slave chargers. For example, the chinese utility model patent application No. 202121648013.1 "a switching power supply circuit" includes a switching power supply circuit body and a common mode inductor FL2, the switching power supply circuit body includes a power control chip IC1 and a feedback circuit, the feedback circuit includes an opto-coupler PC1, a controllable precision voltage-stabilizing source IC2 and a voltage dividing circuit, a first end of the common mode inductor FL2 is connected to positive and negative output terminals of the switching power supply circuit body, a second end of the common mode inductor FL2 is connected to positive and negative output terminals of the switching power supply circuit, an input terminal of the voltage dividing circuit is connected to a positive output terminal of the switching power supply circuit, an output terminal of the voltage dividing circuit is connected to a reference terminal of the controllable precision voltage-stabilizing source IC2, a negative terminal of the controllable precision voltage-stabilizing source IC2 is connected in series with a primary terminal of the opto-coupler PC1 and a positive output terminal of the switching power supply circuit body in sequence, a positive terminal of the controllable precision voltage-stabilizing source IC2 is grounded, and a secondary terminal of the opto-coupler PC1 is connected between a feedback signal input terminal of the power control chip IC1 and ground. Although this power supply can output a voltage with a small ripple, it uses many electronic components, and is difficult to automatically adjust when an abnormality occurs, so as to ensure the stability of the output voltage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a switching power supply circuit and charger thereof to solve the problem that exists among the prior art.
In order to achieve the above object, the utility model adopts the following technical scheme: the switching power supply circuit is characterized by comprising a rectifier bridge BD1, wherein a second pin of the rectifier bridge BD1 is connected with the anode of a first electrolytic capacitor CE1, and the cathode of the first electrolytic capacitor CE1 is grounded;
the positive electrode of the first electrolytic capacitor CE1 is connected with a first pin of a transformer T1, a second pin of the transformer T1 is connected with a fifth pin, a sixth pin, a seventh pin and an eighth pin of a first chip U1 together and then connected with the positive electrode of a first diode D1, the cathode of the first diode D1 is connected with one end of a third capacitor C3 and one end of a fourth resistor R4 respectively, and the other end of the third capacitor C3 and the other end of the fourth resistor R4 are connected with the positive electrode of the first electrolytic capacitor CE 1;
a first pin of the first chip U1 is connected to a negative electrode of the first electrolytic capacitor CE1 and one end of the first resistor R1, respectively, and a second pin of the first chip U1 is connected to the other end of the first resistor R1; a third pin of the first chip U1 is connected to one end of a second resistor R2, one end of a third resistor R3, and one end of a second capacitor C2, respectively, and the other end of the second resistor R2 is connected to the other end of the second capacitor C2 in parallel and then connected to the other end of the first resistor R1; a fourth pin of the first chip U1 is connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is connected to the other end of the first resistor R1;
the other end of the third resistor R3 is connected with a fifth pin of the voltage transformer T1, a fourth pin of the voltage transformer T1 is connected with one end of the mica capacitor CY, and the other end of the mica capacitor CY is connected with the negative electrode of the power supply UO;
the sixth pin of the transformer T1 is connected with the positive electrode of the power supply, the tenth pin of the transformer T1 is connected with the fifth pin, the sixth pin, the seventh pin and the eighth pin of the second chip U2, the fourth pin of the second chip U2 is connected with the sixth pin of the transformer T1, the third pin, the second pin and the first pin of the second chip U2 are connected in parallel and then are respectively connected with the cathode of the light-emitting diode LED1, the cathode of the third electrolytic capacitor CE3 and one end of the fifth resistor, and the anode of the light-emitting diode LED1, the anode of the third electrolytic capacitor CE3 and the other end of the fifth resistor are connected with the positive electrode of the power supply UO.
Preferably, in the technical scheme, a first pin of the rectifier bridge BD1 is connected to an output end of the thermal relay FR1, an input end of the thermal relay FR1 is connected to a live wire L of the mains supply, a third pin of the rectifier bridge BD1 is connected to a zero line N of the mains supply, and a fourth pin of the rectifier bridge BD1 is grounded.
Preferably, in the present technical solution, the transformer T1 is a high frequency transformer with model EE 1310.
Preferably, in the present technical solution, the specification of the first electrolytic capacitor CE1 is 10 μ F/400V; the third electrolytic capacitor CE3 has a specification of 1000. Mu.F/10V.
Preferably, in the present embodiment, the specification of the mica capacitor CY is 1nF/1000Vac.
Preferably, in the present embodiment, the first capacitor C1 and the second capacitor C2 both have a specification of 2.2 μ F/25V, and the third capacitor C3 has a specification of 1nF/500V.
Preferably, in the present technical solution, the resistance of the first resistor R1 is 0 Ω, the resistance of the second resistor R2 is 10k Ω, the resistance of the third resistor R3 is 33k Ω, the resistance of the fourth resistor R4 is 330k Ω, the resistance of the fifth resistor R5 is 820k Ω, and the resistance of the sixth resistor R6 is 2.2k Ω.
Preferably, in this embodiment, the model selected by the first chip U1 is CR5218SF.
Preferably, in this technical solution, the model of the second chip U2 is FSD6219.
Another object of the present invention is to provide a charger, which includes a switching power supply circuit.
Compared with the prior art, the utility model discloses possess following beneficial effect:
the utility model discloses a switching power supply and charger thereof can restrain reverse peak voltage, and the direct current voltage ripple of output is little, and output power supply stability is good, can quick charge, and the high quality, and circuit structure is simple, and is with low costs, easily the factory production manufacturing.
Drawings
Fig. 1 is a schematic circuit diagram of a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Example 1
Please refer to fig. 1, which shows a first embodiment of a switching power supply circuit, which includes a rectifier bridge BD1, a first pin of the rectifier bridge BD1 is connected to an output terminal of a thermal relay FR1, an input terminal of the thermal relay FR1 is connected to a live line L of a mains supply, a third pin of the rectifier bridge BD1 is connected to a zero line N of the mains supply, and a fourth pin of the rectifier bridge BD1 is grounded; a second pin of the rectifier bridge BD1 is connected with the anode of the first electrolytic capacitor CE1, and the cathode of the first electrolytic capacitor CE1 is grounded;
the positive electrode of the first electrolytic capacitor CE1 is connected with a first pin (a wire inlet end of a primary coil Np) of the transformer T1, a second pin (a wire outlet end of the primary coil Np) of the transformer T1 is connected with a fifth pin, a sixth pin, a seventh pin and an eighth pin of the first chip U1 together and then connected with the anode of the first diode D1, the cathode of the first diode D1 is connected with one end of a third capacitor C3 and one end of a fourth resistor R4 respectively, and the other end of the third capacitor C3 and the other end of the fourth resistor R4 are connected with the positive electrode of the first electrolytic capacitor CE 1;
a first pin of the first chip U1 is connected with a negative electrode of the first electrolytic capacitor CE1 and one end of the first resistor R1 respectively, and a second pin of the first chip U1 is connected with the other end of the first resistor R1; a third pin of the first chip U1 is connected with one end of the second resistor R2, one end of the third resistor R3 and one end of the second capacitor C2, respectively, and the other end of the second resistor R2 and the other end of the second capacitor C2 are connected in parallel and then connected with the other end of the first resistor R1; a fourth pin of the first chip U1 is connected with one end of a first capacitor C1, and the other end of the first capacitor C1 is connected with the other end of a first resistor R1;
the other end of the third resistor R3 is connected to a fifth pin of the voltage transformer T1 (i.e., the incoming line end of the feedback coil Na), a fourth pin of the voltage transformer T1 (i.e., the outgoing line end of the feedback coil Na) is connected to one end of the mica capacitor CY, and the other end of the mica capacitor CY is connected to the negative electrode of the +5V power supply;
a sixth pin (i.e., an incoming line end of the secondary coil Ns) of the transformer T1 is connected to the positive electrode of the +5V power supply, a tenth pin (i.e., an outgoing line end of the secondary coil Ns) of the transformer T1 is connected to the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the second chip U2, a fourth pin of the second chip U2 is connected to the sixth pin of the transformer T1, the third pin, the second pin, and the first pin of the second chip U2 are connected in parallel and then are connected to the cathode of the light emitting diode LED1, the cathode of the third electrolytic capacitor CE3, and one end of the fifth resistor, respectively, and the anode of the light emitting diode LED1, the anode of the third electrolytic capacitor CE3, and the other end of the fifth resistor are connected to the positive electrode of the +5V power supply.
Preferably, the transformer T1 is a high frequency transformer of type EE 1310.
Preferably, the rectifier bridge BD1 is a bridge rectifier with the specification of 0.8A/1000V.
Preferably, the specification of the first electrolytic capacitor CE1 is 10 μ F/400V; the third electrolytic capacitor CE3 was 1000. Mu.F/10V in specification.
Preferably, the first diode D1 has a size of 1A/1000V.
Preferably, the mica capacitor CY has a specification of 1nF/1000Vac.
Preferably, the first capacitor C1 and the second capacitor C2 are both 2.2 μ F/25V, and the third capacitor C3 is 1nF/500V.
Preferably, the first resistor R1 has a specification of 0 Ω, the second resistor R2 has a specification of 10k Ω, the third resistor R3 has a specification of 33k Ω, the fourth resistor R4 has a specification of 330k Ω, the fifth resistor R5 has a specification of 820k Ω, and the sixth resistor R6 has a specification of 2.2k Ω.
Preferably, the model of the first chip U1 is CR5218SF, the PWM switch is a high-performance primary side detection control PWM switch, the rapid starting function is achieved, the starting time is more, a multi-mode control efficiency balancing technology is adopted, the control power consumption can be reduced, the control efficiency can be improved, a primary inductance compensation technology and an internal integrated output line voltage compensation technology are adopted, and the normal work can be guaranteed under a double-winding or triple-winding application system.
Preferably, the model of the second chip U2 is FSD6219, which is a high-performance synchronous rectification circuit applied to a switching power supply system, and the high-performance synchronous rectification controller and the power tube with low on-resistance are integrated to replace a schottky diode in a conventional flyback converter system, so that heat loss can be reduced, the output current capability can be increased, the efficiency can be improved, a complete protection function can be provided, the reliability of the system can be improved, DCM and QR working modes can be supported, a 5V charger and adapter system can be satisfied, and the power supply mode is to directly supply power through system output.
Example 2
Referring to fig. 2, a second embodiment of a switching power supply circuit is different from embodiment 1 in that, in embodiment 2, the second capacitor C2 is de-energized, and a fourth electrolytic capacitor CE4 are connected in parallel between a third electrolytic capacitor CE3 and a fifth resistor R5, and the selected specification is 470 muf/10V, so that voltage stabilization output of +5V and 2A can be obtained, and the charging efficiency is accelerated due to the increased charging current.
The circuit principle of the technical scheme is explained as follows:
1. based on the prior art, when the input alternating voltage is changed within the range of 110-240V, the voltage regulation rate Sv is less than or equal to 1 percent. When the load current changes greatly, the load regulation rate SI =5%, in order to simplify the circuit, this technical scheme has adopted the basic feedback mode. Specifically, after a power supply is connected (a live line L and a zero line N are connected), 220V alternating current is rectified through a bridge rectifier bridge BD1, filtered through a first electrolytic capacitor CE1 to obtain a direct current high voltage of about +310V, and then provides a required working voltage to a first chip CR5218SF through a primary coil Np of a transformer T1, and a pulse width modulation power signal output from a secondary coil Ns is subjected to high-frequency rectification and filtering through a second chip U2 and a third electrolytic capacitor CE3 to obtain a stabilized voltage output with the specifications of +5V and 1.5A, and a voltage ripple is small.
2. The voltage on the feedback coil Na of the transformer T1 is sampled and fed back through the second resistor R2 and the third resistor R3, the control voltage is applied to the pin of the third pin of the first chip U1, and an absorption loop is formed by the diode D1, the fourth resistor R4, and the third capacitor C3, so that the reverse peak voltage on the cathode of the diode D1 can be effectively suppressed.
3. The general working principle of the technical scheme is as follows: when the output voltage Uo (Uo refers to the corresponding output voltage V +, V-) in fig. 1 decreases due to some reason, the feedback coil voltage and the control terminal voltage (third pin) of the first chip U1 also decrease, and when the error voltage Ur generated inside the first chip U1 increases, the pulse duty ratio output by the PWM comparator inside the first chip U1 also increases (that is, the difference between D + and D + of the communication interfaces USB1, USB2, and USB3 increases), and after passing through the triode and the step-down output circuit, the output voltage Uo increases, and finally the output voltage is maintained unchanged. And vice versa.
In conclusion, the switching power supply and the charger thereof in the technical scheme can restrain the reverse peak voltage, the output direct-current voltage has small ripple, the output power supply has good stability, can be charged quickly, has high quality, and is simple in circuit structure, low in cost and easy to produce and manufacture in factories.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A switching power supply circuit is characterized by comprising a rectifier bridge BD1, wherein a second pin of the rectifier bridge BD1 is connected with the anode of a first electrolytic capacitor CE1, and the cathode of the first electrolytic capacitor CE1 is grounded;
the positive electrode of the first electrolytic capacitor CE1 is connected with a first pin of a transformer T1, a second pin of the transformer T1 is connected with a fifth pin, a sixth pin, a seventh pin and an eighth pin of a first chip U1 together and then connected with the positive electrode of a first diode D1, the cathode of the first diode D1 is connected with one end of a third capacitor C3 and one end of a fourth resistor R4 respectively, and the other end of the third capacitor C3 and the other end of the fourth resistor R4 are connected with the positive electrode of the first electrolytic capacitor CE 1;
a first pin of the first chip U1 is connected to a negative electrode of the first electrolytic capacitor CE1 and one end of the first resistor R1, respectively, and a second pin of the first chip U1 is connected to the other end of the first resistor R1; a third pin of the first chip U1 is connected to one end of a second resistor R2, one end of a third resistor R3, and one end of a second capacitor C2, respectively, and the other end of the second resistor R2 is connected to the other end of the second capacitor C2 in parallel and then connected to the other end of the first resistor R1; a fourth pin of the first chip U1 is connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is connected to the other end of the first resistor R1;
the other end of the third resistor R3 is connected with a fifth pin of the voltage transformer T1, a fourth pin of the voltage transformer T1 is connected with one end of the mica capacitor CY, and the other end of the mica capacitor CY is connected with the negative electrode of the power supply UO;
the sixth pin of the transformer T1 is connected with the positive electrode of the power supply, the tenth pin of the transformer T1 is connected with the fifth pin, the sixth pin, the seventh pin and the eighth pin of the second chip U2, the fourth pin of the second chip U2 is connected with the sixth pin of the transformer T1, the third pin, the second pin and the first pin of the second chip U2 are connected in parallel and then are respectively connected with the cathode of the light-emitting diode LED1, the cathode of the third electrolytic capacitor CE3 and one end of the fifth resistor, and the anode of the light-emitting diode LED1, the anode of the third electrolytic capacitor CE3 and the other end of the fifth resistor are connected with the positive electrode of the power supply UO.
2. The switching power supply circuit according to claim 1, wherein the first pin of the rectifier bridge BD1 is connected to an output terminal of a thermal relay FR1, an input terminal of the thermal relay FR1 is connected to a live line L of a mains supply, a third pin of the rectifier bridge BD1 is connected to a neutral line N of the mains supply, and a fourth pin of the rectifier bridge BD1 is grounded.
3. The switching power supply circuit according to claim 1, wherein the transformer T1 is a high frequency transformer model EE 1310.
4. The switching power supply circuit according to claim 1, wherein the first electrolytic capacitor CE1 is 10 μ F/400V; the third electrolytic capacitor CE3 has a specification of 1000. Mu.F/10V.
5. The switching power supply circuit according to claim 1, wherein the mica capacitor CY is 1nF/1000Vac in specification.
6. The switching power supply circuit according to claim 1, wherein the first capacitor C1 and the second capacitor C2 are each 2.2 μ F/25V in size, and the third capacitor C3 is 1nF/500V in size.
7. The switching power supply circuit according to claim 1, wherein the first resistor R1 has a resistance of 0 Ω, the second resistor R2 has a resistance of 10k Ω, the third resistor R3 has a resistance of 33k Ω, the fourth resistor R4 has a resistance of 330k Ω, the fifth resistor R5 has a resistance of 820k Ω, and the sixth resistor R6 has a resistance of 2.2k Ω.
8. The switching power supply circuit according to claim 1, wherein the selected model of the first chip U1 is CR5218SF.
9. The switching power supply circuit according to claim 1, wherein the second chip U2 is model number FSD6219.
10. A charger, characterized by comprising a switching power supply circuit according to any one of claims 1 to 9.
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CN202223130974.0U CN218733889U (en) | 2022-11-24 | 2022-11-24 | Switching power supply circuit and charger thereof |
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CN202223130974.0U CN218733889U (en) | 2022-11-24 | 2022-11-24 | Switching power supply circuit and charger thereof |
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