CN212486385U - Wide input voltage starting circuit - Google Patents
Wide input voltage starting circuit Download PDFInfo
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- CN212486385U CN212486385U CN202021512398.4U CN202021512398U CN212486385U CN 212486385 U CN212486385 U CN 212486385U CN 202021512398 U CN202021512398 U CN 202021512398U CN 212486385 U CN212486385 U CN 212486385U
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Abstract
The utility model discloses a wide input voltage starting circuit, include: voltage adjustment unit and voltage start unit, voltage adjustment unit be used for doing voltage start unit provides stable direct current input voltage, thereby guarantee voltage start unit steady operation, voltage start unit includes the secondary start circuit that first starting circuit and current transformer constitute by first switch tube and second switch tube in addition, first starting circuit is the power supply of power IC chip, after first starting circuit has the voltage for current transformer's secondary winding, be the power by secondary winding, the IC chip supplies power, and close first starting circuit, thereby voltage start circuit's loss has been reduced.
Description
Technical Field
The utility model relates to a voltage circuit technical field specifically is a wide input voltage starting circuit.
Background
A high-quality power supply has the characteristics of good starting performance, high conversion efficiency and the like. However, since the input voltage range of the DC-DC switching power supply is wide and the power IC chip needs a stable operating voltage, the start circuit is required to provide a safe and stable start voltage for the power IC chip.
However, in the prior art, the starting circuit is a simple starting circuit mainly composed of a resistor and a voltage stabilizing diode, and the starting circuit has large power consumption under normal operation and unstable voltage under a high-temperature environment.
Therefore the utility model provides a wide input voltage starting circuit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wide input voltage starting circuit aims at reducing starting circuit's consumption to guarantee its steady operation.
The utility model discloses a realize like this:
a wide input voltage start-up circuit, comprising: a voltage adjusting unit and a voltage starting unit, the voltage adjusting unit is used for providing stable direct current input voltage for the voltage starting unit, wherein,
the voltage starting unit includes: the voltage regulation circuit comprises a first resistor, a second resistor, a third resistor, a capacitor, a voltage-stabilizing diode, a first switch tube, a second switch tube, a current transformer, a first diode, a second diode and a power supply IC chip, wherein one end of the first resistor is connected with the output end of the voltage regulation unit, the other end of the first resistor is respectively connected with the cathodes of the first switch tube and the voltage-stabilizing diode, the anode of the voltage-stabilizing diode is grounded, the drain electrode of the first switch tube is connected with the source electrode of the second switch tube, the grid electrode of the first switch tube is connected with the second resistor in series and then grounded, the grid electrode of the second switch tube is connected with working voltage, the drain electrode of the second switch tube is connected with the anode of the first diode after being connected with the primary winding of the current transformer in series, the cathode of the first diode is connected with one end of the capacitor, and the other end of the capacitor is grounded, one end of the capacitor is further connected with the power supply IC chip, a secondary winding of the current transformer is connected with an anode of the second diode in series, a cathode of the second diode is connected with one end of the third resistor, and the other end of the third resistor is connected with the second resistor.
Further, the first switch tube adopts a P channel type field effect tube, and the second switch tube adopts an N channel type field effect tube.
Furthermore, the first switch tube and the second switch tube are both connected in parallel with an absorption circuit, and the absorption circuit is formed by connecting a resistor and a capacitor in series.
Further, the voltage adjusting unit includes: the transformer comprises a transformer, a filtering unit, a voltage stabilizing unit and a PWM (pulse-width modulation) feedback device, wherein the input side of the transformer is connected with an alternating current power supply, the output side of the transformer is connected with the filtering unit, the filtering unit is connected with the voltage stabilizing unit, the output end of the voltage stabilizing unit is connected with a first resistor, the output end of the voltage stabilizing unit is also connected with the input end of the PWM feedback device, and the output end of the PWM feedback device is connected with the input side of the transformer.
Further, the filtering unit adopts a filtering capacitor.
Further, the voltage stabilizing unit adopts a voltage stabilizing diode.
Further, the PWM feedback device adopts a UC3842 chip.
Compared with the prior art, the beneficial effects of the utility model are that: the voltage regulating unit provides a stable input voltage for the voltage starting unit, so that the voltage starting unit is ensured to work stably, in addition, the voltage starting unit comprises a primary starting circuit consisting of a first switching tube and a second switching tube and a secondary starting circuit consisting of a current transformer, the primary starting circuit supplies power for a power supply IC chip, after the primary starting circuit has voltage for a secondary winding of the current transformer, the secondary winding supplies power for the IC chip, and the primary starting circuit is closed, so that the loss of the voltage starting circuit is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit diagram of a wide input voltage starting circuit provided by the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, a wide input voltage start-up circuit includes: a voltage adjusting unit 100 and a voltage starting unit 200, wherein the voltage adjusting unit 100 is used for providing a stable direct current input voltage for the voltage starting unit 200, wherein,
the voltage starting unit 200 includes: a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C1, a zener diode D1, a first switch tube Q1, a second switch tube Q2, a current transformer TA, a first diode D2, a second diode D3 and a power supply IC chip 201, wherein one end of the first resistor R1 is connected to the output end of the voltage adjustment unit 100, the other end of the first resistor R1 is respectively connected to the cathodes of the first switch tube Q1 and the zener diode D1, the anode of the zener diode D1 is grounded, the drain of the first switch tube Q1 is connected to the source of the second switch tube Q2, the gate of the first switch tube Q1 is connected in series with the second resistor R2 and then grounded, the gate of the second switch tube Q2 is connected to an operating voltage, the drain of the second switch tube Q2 is connected in series with the primary winding of the current transformer TA and then connected to the anode of the first diode D6342, and the cathode of the capacitor C5928 of the first diode D1, the other end of the capacitor C1 is grounded, one end of the capacitor C1 is further connected to the power IC chip 201, the secondary winding of the current transformer TA is connected in series to the anode of the second diode D3, the cathode of the second diode D3 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the second resistor R2.
Further, the first switching transistor Q1 is a P-channel fet, and the second switching transistor Q2 is an N-channel fet.
Further, the first switch tube Q1 and the second switch tube Q2 are both connected in parallel with an absorption circuit, and the absorption circuit is formed by connecting a resistor and a capacitor in series.
Further, the voltage adjusting unit 100 includes: the transformer 101, the filtering unit 102, the voltage stabilizing unit 103 and the PWM feedback device 104, wherein an input side of the transformer 101 is connected to an alternating current power AC, an output side of the transformer 101 is connected to the filtering unit 102, the filtering unit 102 is connected to the voltage stabilizing unit 103, an output end of the voltage stabilizing unit 103 is connected to the first resistor R1, an output end of the voltage stabilizing unit 103 is further connected to an input end of the PWM feedback device 104, and an output end of the PWM feedback device 104 is connected to the input side of the transformer 101.
Further, the filtering unit 102 employs a filtering capacitor.
Further, the voltage stabilizing unit 103 employs a voltage stabilizing diode.
Further, the PWM feedback unit 104 employs a UC3842 chip.
The working principle is that firstly 220V commercial power is converted into low voltage power, such as 12V power, through the transformer 101, and then filtered by the filtering unit 102 to output low voltage alternating current, the low voltage alternating current is still not pure enough after being converted into low voltage direct current, and has certain fluctuation, stable low voltage direct current is obtained after voltage stabilization through the voltage stabilizing diode, whether the voltage output by the voltage stabilizing diode is stable or not is detected in real time through the PWM feedback device 104, if the voltage is not stable, the voltage is fed back to the transformer 101, and the voltage is adjusted by the transformer 101;
then, the regulated stable dc low voltage input voltage starting unit 100 is started, and the specific process is as follows: after the current passes through the first resistor R1, an impedance is generated to provide a rush current for the source of the first switch tube Q1, so that the first switch tube Q1 starts to operate, the current between the drain and the gate of the first switch tube Q1 provides a rush current for the second switch tube Q2, the second switch tube Q2 is started to operate, when the drain current of the second switch tube Q2 reaches saturation, the second switch tube Q2 is closed, the saturation current flows to the capacitor C1, and the capacitor C1 is charged until the second switch tube Q2 is in a half-cut-off or half-saturation state. At this time, the capacitor C1 is equivalent to a constant current source to provide energy for the power IC chip 201, when the voltage of the capacitor C1 drops to a certain value, the first switch tube Q1 and the second switch tube Q2 continue to charge the capacitor C1 until the TA secondary winding of the current transformer has voltage, the current of the secondary winding flows to the second resistor R2 and the third resistor R3 on the one hand, and the voltage between the gate and the drain of the first switch tube Q1 is divided, so that the first switch tube Q1 is in a cut-off state, that is, the first switch tube Q1 is cut off, and the capacitor C1 is charged by all the secondary windings, thereby providing energy for the power IC chip 201. Therefore, the loss of the initial starting circuit formed by the first switch tube Q1 and the second switch tube Q2 is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A wide input voltage start-up circuit, comprising: a voltage adjusting unit and a voltage starting unit, the voltage adjusting unit is used for providing stable direct current input voltage for the voltage starting unit, wherein,
the voltage starting unit includes: the voltage regulation circuit comprises a first resistor, a second resistor, a third resistor, a capacitor, a voltage-stabilizing diode, a first switch tube, a second switch tube, a current transformer, a first diode, a second diode and a power supply IC chip, wherein one end of the first resistor is connected with the output end of the voltage regulation unit, the other end of the first resistor is respectively connected with the cathodes of the first switch tube and the voltage-stabilizing diode, the anode of the voltage-stabilizing diode is grounded, the drain electrode of the first switch tube is connected with the source electrode of the second switch tube, the grid electrode of the first switch tube is connected with the second resistor in series and then grounded, the grid electrode of the second switch tube is connected with working voltage, the drain electrode of the second switch tube is connected with the anode of the first diode after being connected with the primary winding of the current transformer in series, the cathode of the first diode is connected with one end of the capacitor, and the other end of the capacitor is grounded, one end of the capacitor is further connected with the power supply IC chip, a secondary winding of the current transformer is connected with an anode of the second diode in series, a cathode of the second diode is connected with one end of the third resistor, and the other end of the third resistor is connected with the second resistor.
2. The wide input voltage starting circuit according to claim 1, wherein said first switching transistor is a P-channel fet and said second switching transistor is an N-channel fet.
3. The wide input voltage starting circuit according to claim 1, wherein the first switching tube and the second switching tube are both connected in parallel with an absorption circuit, and the absorption circuit is formed by connecting a resistor and a capacitor in series.
4. The wide input voltage start-up circuit of claim 1, wherein the voltage adjustment unit comprises: the transformer comprises a transformer, a filtering unit, a voltage stabilizing unit and a PWM (pulse-width modulation) feedback device, wherein the input side of the transformer is connected with an alternating current power supply, the output side of the transformer is connected with the filtering unit, the filtering unit is connected with the voltage stabilizing unit, the output end of the voltage stabilizing unit is connected with a first resistor, the output end of the voltage stabilizing unit is also connected with the input end of the PWM feedback device, and the output end of the PWM feedback device is connected with the input side of the transformer.
5. The wide input voltage starting circuit according to claim 4, wherein the filter unit employs a filter capacitor.
6. The wide input voltage starting circuit according to claim 4, wherein the voltage stabilizing unit employs a voltage stabilizing diode.
7. The wide input voltage start-up circuit of claim 4, wherein the PWM feedback circuit employs a UC3842 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512398.4U CN212486385U (en) | 2020-07-28 | 2020-07-28 | Wide input voltage starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021512398.4U CN212486385U (en) | 2020-07-28 | 2020-07-28 | Wide input voltage starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212486385U true CN212486385U (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021512398.4U Active CN212486385U (en) | 2020-07-28 | 2020-07-28 | Wide input voltage starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212486385U (en) |
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2020
- 2020-07-28 CN CN202021512398.4U patent/CN212486385U/en active Active
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