CN210405097U - Wide voltage range DC input switch power supply - Google Patents
Wide voltage range DC input switch power supply Download PDFInfo
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- CN210405097U CN210405097U CN201921308056.8U CN201921308056U CN210405097U CN 210405097 U CN210405097 U CN 210405097U CN 201921308056 U CN201921308056 U CN 201921308056U CN 210405097 U CN210405097 U CN 210405097U
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Abstract
The utility model provides a wide voltage range direct current input switching power supply includes: the power supply comprises a power supply, a DC-DC power conversion circuit, a PWM control chip and a power supply chip, wherein the positive end and the negative end of the power supply are respectively connected with the first input end and the second input end of the DC-DC power conversion circuit, the first input end and the second input end of the PWM control chip and the first input end and the second input end of the power supply chip, two resistors are further connected in series between the positive end and the negative end of the power supply, the third input end of the PWM control chip is connected with the connection point of the two resistors, the output end of the power supply chip is also connected with the connection point of the two resistors through the third resistor, and the output end of the PWM control chip is connected with the third input end of the DC-DC power conversion circuit. The utility model discloses a power chip can show the input voltage scope that enlarges PWM control chip and allow, can be in order to enlarge switching power supply's operating voltage scope.
Description
Technical Field
The utility model belongs to the switching power supply class product of direct current input type especially relates to a wide voltage range direct current input switching power supply.
Background
With the development and progress of battery technology, more and more electric devices are powered by using a direct current input, the supply voltage of the direct current electric devices is various, such as 12V, 24V, 36V, 48V, 60V and the like are commonly used, the allowable voltage fluctuation range of each power supply is small, for example, a 12V battery should normally be between 10V and 14V, and thus different switching power supplies are generally required to be designed for different input voltages. In addition, many PWM control chips only allow the chip to operate within a certain input voltage range, and when the operating voltage exceeds the allowable operating voltage range, the PWM control chip triggers the overvoltage/undervoltage protection to stop operating, and sometimes people need the switching power supply to operate within a wider voltage range, such as compatible with dc inputs of different specifications, such as 12V, 24V, 36V, 48V, 60V, and even 72V.
For example, as shown in fig. 1, the PWM control chip detects a dc input voltage through a voltage dividing network composed of a Vline pin and resistors R1 'and R2', the internal of the Vline is an operational amplifier, and the input high impedance can be considered as an open circuit, so that the Vline voltage is R2 'Vin/(R1' + R2'), and Vin ═ Vline (R1' + R2')/R2' = Vline (R1'/R2' +1) is derived. If Vline e [ V1, V2], in the case that the Vline range is fixed, it can be seen that both the upper limit Vinmax and the lower limit Vinmin of the working range Vin allowed by the switching power supply become larger as the ratio of R1'/R2' becomes larger and become smaller as the ratio of R1'/R2' becomes smaller, that is, if the upper limit is increased, the lower limit is also increased, and if the lower limit is decreased, the upper limit is also decreased, that is, how to adjust R1 'and R2', the possibility that the upper limit and the lower limit are simultaneously enlarged in two directions cannot be achieved. Therefore, other methods are needed to address this problem.
SUMMERY OF THE UTILITY MODEL
To this problem, the utility model provides a wide voltage range direct current input switching power supply of working range broad.
The technical purpose of the utility model is realized by the following technical scheme:
a wide voltage range dc input switching power supply, comprising: the power supply comprises a power supply, a DC-DC power conversion circuit, a PWM control chip and a power supply chip, wherein the positive end and the negative end of the power supply are respectively connected with the first input end and the second input end of the DC-DC power conversion circuit, the first input end and the second input end of the PWM control chip and the first input end and the second input end of the power supply chip, a first resistor and a second resistor are further connected in series between the positive end and the negative end of the power supply, the third input end of the PWM control chip is connected with the connection point of the first resistor and the second resistor, the output end of the power supply chip is also connected with the connection point of the first resistor and the second resistor through a third resistor, and the output end of the PWM control chip is connected with the third input end of the DC-DC power conversion circuit.
Further, the power chip includes fourth resistance and first three-terminal type constant voltage power supply, the one end of fourth resistance is regarded as the first input of power chip with the positive end of power is connected, the other end of fourth resistance is connected the input of first three-terminal type constant voltage power supply, the earthing terminal of first three-terminal type constant voltage power supply is regarded as the second input of power chip with the negative end of power is connected, the output of first three-terminal type constant voltage power supply connect in the fourth resistance with the tie point of first three-terminal type constant voltage power supply, the fourth resistance with the tie point of first three-terminal type constant voltage power supply is regarded as the output of power chip.
Further, the DC-DC power conversion circuit includes a switch loop, the switch loop includes a primary winding of a transformer, one end of the primary winding is a first input end of the DC-DC power conversion circuit and is connected to a positive end of the power supply, and the other end of the primary winding is a third input end of the DC-DC power conversion circuit and is connected to an output end of the PWM control chip.
Further, the DC-DC power conversion circuit further includes an absorption circuit, the absorption circuit includes a fifth resistor, a fifth capacitor, and a fourth diode, after the fifth resistor is connected in parallel with the fifth capacitor, one end of the fifth resistor is connected to the first input terminal of the DC-DC power conversion circuit, the other end of the fifth resistor is connected to the negative terminal of the fourth diode, and the positive terminal of the fourth diode is connected to the third input terminal of the DC-DC power conversion circuit.
Further, the DC-DC power conversion circuit further includes a voltage output circuit, the voltage output circuit includes a first secondary winding of the transformer, a first diode, and a second capacitor, one end of the first secondary winding of the transformer is connected to the positive end of the first diode, the other end of the first secondary winding of the transformer is grounded, the negative end of the first diode is used as the output end of the voltage output circuit, the negative end of the first diode is further connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
Further, the DC-DC power conversion circuit further includes a working voltage providing circuit, the working voltage providing circuit includes a second secondary winding of a transformer, a second diode, a third capacitor, a fourth capacitor, and a fifteenth resistor, one end of the second secondary winding of the transformer is connected to the positive terminal of the second diode, the other end of the second secondary winding of the transformer is connected to the negative terminal of the power supply as the second input terminal of the DC-DC power conversion circuit, the negative terminal of the second diode is connected to one end of the third capacitor, the other end of the third capacitor is connected to the second input terminal of the DC-DC power conversion circuit, the negative terminal of the second diode is further connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is used as the output terminal of the working voltage providing circuit, and after the third diode is connected with the fourth capacitor in parallel, one end of the third diode is connected with the output end of the working voltage providing circuit, the other end of the third diode is connected with the second input end of the DC-DC power conversion circuit, the PWM control chip further comprises a fourth input end, and the output end of the working voltage providing circuit is connected with the fourth input end of the PWM control chip.
Further, the DC-DC power conversion circuit further includes a PWM oscillation signal circuit, the PWM control chip further includes a fifth input terminal, the PWM oscillation signal circuit includes a sixth resistor, one end of the sixth resistor is connected to the fifth input terminal of the PWM control chip, and the other end of the sixth resistor is connected to the second input terminal of the DC-DC power conversion circuit.
Further, the DC-DC power conversion circuit further includes a voltage stabilizing feedback network, the voltage stabilizing feedback network includes an optocoupler, a second three-terminal regulated power supply, a sixth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor, an anode of a light emitting diode of the optocoupler is connected to an output terminal of the voltage output circuit through the twelfth resistor, an anode of the light emitting diode of the optocoupler is further connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to an input terminal of the second three-terminal regulated power supply, a ground terminal of the second three-terminal regulated power supply is grounded, a cathode of the light emitting diode of the optocoupler is also connected to the input terminal of the second three-terminal regulated power supply, and a collector of a phototriode of the optocoupler is connected to an output terminal of the working voltage supply circuit, an emitting electrode of a phototriode of the optocoupler is connected with one end of a ninth resistor, the other end of the ninth resistor is used as a first output end of the voltage-stabilizing feedback network, one end of an eighth resistor is connected with the other end of the ninth resistor, the other end of the eighth resistor is used as a second output end of the voltage-stabilizing feedback network, the emitting electrode of the phototriode of the optocoupler is further connected with a second input end of the DC-DC power conversion circuit through a seventh resistor, an output end of a second three-terminal type voltage-stabilizing power supply is connected with one end of a thirteenth resistor, the other end of a thirteenth resistor is connected with one end of a sixth capacitor, the other end of the sixth capacitor is also connected with an input end of the second three-terminal type voltage-stabilizing power supply, and an output end of the second three-terminal type voltage-stabilizing power supply is further connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with the output end of the voltage output circuit, the output end of the second three-terminal type voltage-stabilized power supply is further connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, the PWM control chip further comprises a sixth input end and a seventh input end, the first output end of the voltage-stabilizing feedback network is connected with the sixth input end of the PWM control chip, and the second output end of the voltage-stabilizing feedback network is connected with the seventh input end of the PWM control chip.
Further, the power supply is a direct current input power supply, the PWM control chip is MP6002 of MPS corporation and has 8 pins, the first input end of the PWM control chip is pin VIN 7, the second input end is pin GND 1, the third input end is pin LINE 2, the fourth input end is pin VCC 6, the fifth input end is pin RT 5, the sixth input end is pin FB 3, the seventh input end is pin COMP 4, and the output end is pin SW 8.
Further, the wide voltage range dc input switching power supply further comprises a first capacitor connected between the positive and negative terminals of the power supply.
The utility model discloses a power chip can show the input voltage scope that enlarges PWM control chip and allow, can be in order to enlarge switching power supply's operating voltage scope. In addition, the specifications of some devices are only slightly adjusted or the voltage withstanding values of devices with proper voltage withstanding specifications, such as an electrolytic capacitor, a switching MOS (metal oxide semiconductor) tube, a rectifier diode and the like, are selected, so that the same design scheme can be compatible with various direct current input voltages, and the design and development cost is reduced.
Drawings
Fig. 1 is a block diagram of a conventional wide voltage range dc input switching power supply;
fig. 2 is a block diagram of a wide voltage range dc input switching power supply according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a wide voltage range dc input switching power supply according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 2, an embodiment of the present invention provides a wide voltage range dc input switching power supply, including: a power supply J1, a DC-DC power conversion circuit (not numbered), a PWM control chip U1, a power supply chip (not numbered), the positive end DC + and the negative end DC-of the power supply J1 are respectively connected with the first input end and the second input end of the DC-DC power conversion circuit, the first input end and the second input end of the PWM control chip U1, and the first input end and the second input end of the power supply chip, a first resistor R1 and a second resistor R2 are also connected in series between the positive terminal DC + and the negative terminal DC-of the power supply J1, the third input terminal of the PWM control chip U1 is connected to the connection point of the first resistor R1 and the second resistor R2, the output end of the power supply chip is also connected to the connection point of the first resistor R1 and the second resistor R2 through a third resistor R3, the output end of the PWM control chip U1 is connected to the third input end of the DC-DC power conversion circuit.
Referring to fig. 3, the power chip includes a fourth resistor R4 and a first three-terminal regulated power supply U2, one end of the fourth resistor R4 serves as a first input terminal of the power chip and is connected to a positive terminal DC + of the power supply J1, the other end of the fourth resistor R4 is connected to an input terminal of the first three-terminal regulated power supply U2, a ground terminal of the first three-terminal regulated power supply U2 serves as a second input terminal of the power chip and is connected to a negative terminal DC-of the power supply J1, an output terminal of the first three-terminal regulated power supply U2 is connected to a connection point between the fourth resistor R4 and the first three-terminal regulated power supply U2, and a connection point between the fourth resistor R4 and the first three-terminal regulated power supply U2 serves as an output terminal of the power chip.
The DC-DC power conversion circuit comprises a switch loop, the switch loop comprises a primary winding T1-A of a transformer T1, one end of the primary winding T1-A is a first input end of the DC-DC power conversion circuit and is connected with a positive end DC + of a power supply J1, and the other end of the primary winding T1-A is a third input end of the DC-DC power conversion circuit and is connected with an output end of the PWM control chip U1.
The DC-DC power conversion circuit further comprises an absorption circuit, the absorption circuit comprises a fifth resistor R5, a fifth capacitor C5 and a fourth diode D4, after the fifth resistor R5 and the fifth capacitor C5 are connected in parallel, one end of the fifth resistor R5 is connected with the first input end of the DC-DC power conversion circuit, the other end of the fifth resistor R5 is connected with the negative end of the fourth diode D4, and the positive end of the fourth diode D4 is connected with the third input end of the DC-DC power conversion circuit.
The DC-DC power conversion circuit further comprises a voltage output circuit, wherein the voltage output circuit comprises a first secondary winding T1-B of a transformer T1, a first diode D1 and a second capacitor C2, one end of the first secondary winding T1-B of the transformer T1 is connected with the positive end of a first diode D1, the other end of the first secondary winding T1-B of the transformer T1 is grounded, the negative end of a first diode D1 is used as the output end VOUT of the voltage output circuit, the negative end of the first diode D1 is further connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is grounded.
The DC-DC power conversion circuit further comprises an operating voltage providing circuit, the operating voltage providing circuit comprises a second secondary winding T1-D of a transformer T1, a second diode D2, a third diode D3, a third capacitor C3, a fourth capacitor C4 and a fifteenth resistor R15, one end of a second secondary winding T1-B of the transformer T1 is connected with the positive end of the second diode D2, the other end of the second secondary winding T1-B of the transformer T1 is used as a second input end of the DC-DC power conversion circuit and is DC-connected with the negative end of the power supply J1, the negative end of the second diode D2 is connected with one end of the third capacitor C3, the other end of the third capacitor C3 is connected with the second input end of the DC-DC power conversion circuit, the negative end of the second diode D2 is further connected with one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is used as the output VCC of the working voltage supply circuit, the third diode D3 is connected in parallel with the fourth capacitor C4, one end of the third diode is connected to the output VCC of the working voltage supply circuit, the other end of the third diode is connected to the second input end of the DC-DC power conversion circuit, the PWM control chip U1 further includes a fourth input end, and the output VCC of the working voltage supply circuit is connected to the fourth input end of the PWM control chip U1. Wherein the third diode D3 is a zener diode or a zener diode.
The DC-DC power conversion circuit further comprises a PWM oscillating signal circuit, the PWM control chip U1 further comprises a fifth input end, the PWM oscillating signal circuit comprises a sixth resistor R6, one end of the sixth resistor R6 is connected with the fifth input end of the PWM control chip, and the other end of the sixth resistor R6 is connected with the second input end of the DC-DC power conversion circuit.
The DC-DC power conversion circuit further includes a regulated feedback network, the regulated feedback network includes an optical coupler U4, a second three-terminal regulated power supply U3, a sixth capacitor C6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14, an anode of a light emitting diode of the optical coupler U4 is connected to the output terminal VOUT of the voltage output circuit through the twelfth resistor R12, an anode of a light emitting diode of the optical coupler U4 is further connected to one end of the eleventh resistor R11, another end of the eleventh resistor R11 is connected to the input terminal of the second three-terminal regulated power supply U3, a ground terminal of the second three-terminal regulated power supply U3 is connected to ground, a cathode of the light emitting diode of the optical coupler U4 is also connected to the input terminal of the second three-terminal regulated power supply U3, a collector of a phototransistor of the optocoupler U4 is connected to an output VCC of the operating voltage supply circuit, an emitter of the phototransistor of the optocoupler U4 is connected to one end of a ninth resistor R9, the other end of the ninth resistor R9 is used as a first output end of the regulated feedback network, one end of an eighth resistor R8 is connected to the other end of the ninth resistor R9, the other end of an eighth resistor R8 is used as a second output end of the regulated feedback network, the emitter of the phototransistor of the optocoupler U4 is further connected to a second input end of the DC-DC power conversion circuit through a seventh resistor R7, an output end of a second three-terminal regulated power supply U3 is connected to one end of a thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected to one end of a sixth capacitor C6, and the other end of the sixth capacitor C6 is also connected to an input end of the second three-terminal regulated power supply U3, the output end of the second three-terminal type regulated power supply U3 is further connected to one end of a fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to the output end VOUT of the voltage output circuit, the output end of the second three-terminal type regulated power supply U3 is further connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is grounded, the PWM control chip U2 further includes a sixth input end and a seventh input end, the first output end of the voltage stabilization feedback network is connected to the sixth input end of the PWM control chip U1, and the second output end of the voltage stabilization feedback network is connected to the seventh input end of the PWM control chip U1.
Specifically, in an embodiment, the power supply is a dc input power supply, the PWM control chip U1 is an MP6002 of MPS corporation, and has 8 pins, the first input end of the PWM control chip U1 is a 7 th pin VIN, the second input end is a 1 st pin GND, the third input end is a 2 nd pin LINE, the fourth input end is a 6 th pin VCC, the fifth input end is a 5 th pin RT, the sixth input end is a 3 rd pin FB, the seventh input end is a 4 th pin COMP, and the output end is an 8 th pin SW.
The wide voltage range direct current input switching power supply further comprises a first capacitor C1, and the first capacitor C1 is connected between the positive terminal DC + and the negative terminal DC-of the power supply J1.
The utility model discloses a power chip links to each other with the PWM control chip, can calculate Vin at this moment [ (R1R 2+ R1R 3+ R2R 3) Vline-R1R 2Vo ]/(R2R 3) ═ R1/R2+1) Vline + R1/R3 (Vline-Vo), wherein Vin is mains voltage, Vline is the operating voltage of PWM control chip, Vo is the output voltage of power chip. Assuming that Vline and R1 and R2 are fixed, then (R1/R2+1) Vline is also relatively fixed, and the variation of Vin is related to R3 and the output voltage Vo of the power supply chip, i.e. to R1/R3 (Vline-Vo), and Vline e [ V1, V2], if Vo is between V1 and V2, i.e. Vo e (V1, V2), the upper and lower limits of (Vline-Vo) can be extended, i.e. V2-Vo > 0, V1-0, and Vin (R1/R2+1) Vline + R1/R3 (Vline-Vo), and the extended range is determined by the product of R1/R3 and (Vline-Vo).
For example, if R1 ═ 240K, R2 ═ 10K, R3 ═ 12K, Vline ∈ [1.2,3], Vo ═ 2.5V,
in the conventional scheme, the allowed upper limit Vinmax (R1/R2+1) × V2 (240K/10K +1) × 3 (V), and the lower limit Vinmin (R1/R2+1) × V1 (240K/10K +1) × 1.2 (V) of the switching power supply operating voltage Vin is 30(V), that is, the switching power supply can operate in a voltage range between 30V and 75V;
in the present invention, the upper limit Vinmax allowed by the switching power supply operating voltage Vin is (R1/R2+1) V2+ R1/R3 (V2-Vo) ((240K/10K +1) × 3+240K/12K (3-2.5) ═ 75+10 ═ 85(V), and Vinmin is (R1/R2+1) V1+ R1/R3 (V1-Vo) ═ 240K/10K +1) ((1.2 +240K/12K (1.2-2.5) ═ 30-26 ═ 4(V), that is, the switching power supply can operate in the range of input 4V to 85V, and the range is significantly expanded compared with the original range of 30V to 75V. Because the lowest working voltage of the MP6002 is 10V (detected by the 7 th pin VIN), the power supply can operate between 10V and 85V, and the actual working voltage range of the power supply is found to match the theoretical calculation.
The utility model discloses a power chip can show the input voltage scope that enlarges PWM control chip and allow, can be in order to enlarge switching power supply's operating voltage scope. In addition, the specifications of some devices are only slightly adjusted or the voltage withstanding values of devices with proper voltage withstanding specifications, such as an electrolytic capacitor, a switching MOS (metal oxide semiconductor) tube, a rectifier diode and the like, are selected, so that the same design scheme can be compatible with various direct current input voltages, and the design and development cost is reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A wide voltage range dc input switching power supply, comprising: the power supply comprises a power supply, a DC-DC power conversion circuit, a PWM control chip and a power supply chip, wherein the positive end and the negative end of the power supply are respectively connected with the first input end and the second input end of the DC-DC power conversion circuit, the first input end and the second input end of the PWM control chip and the first input end and the second input end of the power supply chip, a first resistor and a second resistor are further connected in series between the positive end and the negative end of the power supply, the third input end of the PWM control chip is connected with the connection point of the first resistor and the second resistor, the output end of the power supply chip is also connected with the connection point of the first resistor and the second resistor through a third resistor, and the output end of the PWM control chip is connected with the third input end of the DC-DC power conversion circuit.
2. The wide voltage range dc input switching power supply according to claim 1, wherein the power chip comprises a fourth resistor and a first three-terminal regulated power supply, one end of the fourth resistor is connected to a positive terminal of the power supply as the first input terminal of the power chip, the other end of the fourth resistor is connected to the input terminal of the first three-terminal regulated power supply, a ground terminal of the first three-terminal regulated power supply is connected to a negative terminal of the power supply as the second input terminal of the power chip, an output terminal of the first three-terminal regulated power supply is connected to a connection point of the fourth resistor and the first three-terminal regulated power supply, and a connection point of the fourth resistor and the first three-terminal regulated power supply is used as the output terminal of the power chip.
3. The wide voltage range direct current input switching power supply according to claim 1, wherein the DC-DC power conversion circuit comprises a switching loop, the switching loop comprises a primary winding of a transformer, one end of the primary winding is connected to the positive terminal of the power supply for the first input terminal of the DC-DC power conversion circuit, and the other end of the primary winding is connected to the output terminal of the PWM control chip for the third input terminal of the DC-DC power conversion circuit.
4. The wide voltage range direct current input switching power supply according to claim 3, wherein the DC-DC power conversion circuit further comprises an absorption circuit, the absorption circuit comprises a fifth resistor, a fifth capacitor, and a fourth diode, after the fifth resistor is connected in parallel with the fifth capacitor, one end of the fifth resistor is connected to the first input terminal of the DC-DC power conversion circuit, the other end of the fifth resistor is connected to the negative terminal of the fourth diode, and the positive terminal of the fourth diode is connected to the third input terminal of the DC-DC power conversion circuit.
5. The wide voltage range DC input switching power supply according to claim 3, wherein the DC-DC power conversion circuit further comprises a voltage output circuit, the voltage output circuit comprises a first secondary winding of a transformer, a first diode, and a second capacitor, one end of the first secondary winding of the transformer is connected to the positive terminal of the first diode, the other end of the first secondary winding of the transformer is grounded, the negative terminal of the first diode is used as the output terminal of the voltage output circuit, the negative terminal of the first diode is further connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
6. The wide voltage range direct current input switching power supply according to claim 5, wherein the DC-DC power conversion circuit further comprises an operating voltage providing circuit, the operating voltage providing circuit comprises a second secondary winding of a transformer, a second diode, a third capacitor, a fourth capacitor, and a fifteenth resistor, one end of the second secondary winding of the transformer is connected to a positive terminal of the second diode, the other end of the second secondary winding of the transformer is connected to a negative terminal of the power supply as a second input terminal of the DC-DC power conversion circuit, a negative terminal of the second diode is connected to one end of the third capacitor, the other end of the third capacitor is connected to the second input terminal of the DC-DC power conversion circuit, and a negative terminal of the second diode is further connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is used as the output end of the working voltage providing circuit, after the third diode is connected with the fourth capacitor in parallel, one end of the third diode is connected with the output end of the working voltage providing circuit, the other end of the third diode is connected with the second input end of the DC-DC power conversion circuit, the PWM control chip further comprises a fourth input end, and the output end of the working voltage providing circuit is connected with the fourth input end of the PWM control chip.
7. The wide voltage range DC input switching power supply according to claim 6, wherein the DC-DC power conversion circuit further comprises a PWM oscillator circuit, the PWM controller further comprises a fifth input terminal, the PWM oscillator circuit comprises a sixth resistor, one end of the sixth resistor is connected to the fifth input terminal of the PWM controller, and the other end of the sixth resistor is connected to the second input terminal of the DC-DC power conversion circuit.
8. The wide voltage range direct current input switching power supply according to claim 7, wherein the DC-DC power conversion circuit further comprises a regulated feedback network, the regulated feedback network comprises an optocoupler, a second three-terminal regulated power supply, a sixth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor, an anode of a light emitting diode of the optocoupler is connected to the output terminal of the voltage output circuit through the twelfth resistor, an anode of a light emitting diode of the optocoupler is further connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to the input terminal of the second three-terminal regulated power supply, a ground terminal of the second three-terminal regulated power supply is grounded, and a cathode of the light emitting diode of the optocoupler is also connected to the input terminal of the second three-terminal regulated power supply, a collector of a phototriode of the optocoupler is connected with an output end of the working voltage supply circuit, an emitter of the phototriode of the optocoupler is connected with one end of a ninth resistor, the other end of the ninth resistor is used as a first output end of the voltage stabilization feedback network, one end of an eighth resistor is connected with the other end of the ninth resistor, the other end of the eighth resistor is used as a second output end of the voltage stabilization feedback network, the emitter of the phototriode of the optocoupler is further connected with a second input end of the DC-DC power conversion circuit through a seventh resistor, an output end of a second three-end type voltage stabilization power supply is connected with one end of a thirteenth resistor, the other end of the thirteenth resistor is connected with one end of a sixth capacitor, and the other end of the sixth capacitor is also connected with an input end of the second three-end type voltage stabilization power supply, the output end of the second three-terminal type voltage-stabilized power supply is further connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with the output end of the voltage output circuit, the output end of the second three-terminal type voltage-stabilized power supply is further connected with one end of a tenth resistor, the other end of the tenth resistor is grounded, the PWM control chip further comprises a sixth input end and a seventh input end, the first output end of the voltage-stabilizing feedback network is connected with the sixth input end of the PWM control chip, and the second output end of the voltage-stabilizing feedback network is connected with the seventh input end of the PWM control chip.
9. The wide voltage range dc input switching power supply of claim 8, wherein said power supply is a dc input power supply, said PWM control chip is MP6002 of MPS corporation, having 8 pins, said PWM control chip has a first input terminal being pin 7 VIN, a second input terminal being pin 1 GND, a third input terminal being pin 2 LINE, a fourth input terminal being pin 6 VCC, a fifth input terminal being pin 5 RT, a sixth input terminal being pin 3 FB, a seventh input terminal being pin 4 COMP, and an output terminal being pin 8 SW.
10. The wide voltage range dc input switching power supply of claim 1, further comprising a first capacitor connected between the positive and negative terminals of said power supply.
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| CN110445395A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Wide-voltage range direct current input switch power supply |
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