CN211089127U - Power supply voltage stabilizing circuit and electric equipment - Google Patents
Power supply voltage stabilizing circuit and electric equipment Download PDFInfo
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- CN211089127U CN211089127U CN202020113174.XU CN202020113174U CN211089127U CN 211089127 U CN211089127 U CN 211089127U CN 202020113174 U CN202020113174 U CN 202020113174U CN 211089127 U CN211089127 U CN 211089127U
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Abstract
The utility model provides a power voltage stabilizing circuit and electric equipment, which comprises an electrostatic protection circuit, a starting protection circuit, a power-off protection circuit, a switch tube, a first capacitor, a second capacitor, a third capacitor, a first resistor and a switch; the input end of the electrostatic protection circuit, one end of the first capacitor, the input end of the start protection circuit and the first end of the switch tube are respectively connected with the power input end, and the other end of the first capacitor is grounded; the first end of the switching tube is connected with the power-off protection circuit; one end of the switch is connected with the starting protection circuit and the second end of the switch tube, and the other end of the switch is grounded through the resistor; the third end of the switching tube is connected with the power output end and the power-off protection circuit; one end of the second capacitor and one end of the third capacitor are respectively connected with the power output end, and the other end of the second capacitor and the other end of the third capacitor are grounded. The technical scheme of the utility model effectively solve the switch and influence the unstable problem of rear end powered device work because of voltage shake in the twinkling of an eye or electric spark when switching power supply.
Description
Technical Field
The utility model relates to a power technical field especially relates to a power voltage stabilizing circuit and consumer.
Background
With the development of electronic circuits, switching power supplies have been widely used in various electric devices due to their small size, high efficiency and fast transient response speed. However, the conventional switch is only a common path, and has no protection and buffering measures, so that the voltage is unstable at the moment of pressing the switch, the voltage is instable and is easy to shake, electric sparks are easy to generate, and the rear-end powered equipment is unstable in operation, and when the switch is disconnected, the influence of power failure on the switch is not considered, and the switch is burnt out due to overlarge current during power failure. Thereby increasing the potential safety hazard and influencing the use experience of the user.
In addition, electrostatic protection is not considered during the use of the switch, so that when a user uses the switch to turn on the power supply, frictional charges generated by human body Static electricity or device Static electricity move to a device sensitive to electrostatic discharge (ESD), and circuit elements are damaged.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a power supply voltage stabilizing circuit and an electrical device to overcome the deficiencies in the prior art.
One embodiment of the utility model provides a power voltage stabilizing circuit, which comprises an electrostatic protection circuit, a starting protection circuit, a power-off protection circuit, a switch tube, a first capacitor, a second capacitor, a third capacitor, a first resistor and a switch;
the input end of the electrostatic protection circuit, one end of the first capacitor, the input end of the start protection circuit and the first end of the switch tube are respectively connected with the power supply input end of the power supply voltage stabilizing circuit, and the other end of the first capacitor is grounded;
the first end of the switching tube is connected with a first potential point of the power-off protection circuit;
one end of the switch is connected with the start protection circuit and the second end of the switch tube respectively, the other end of the switch is connected with one end of the first resistor, and the other end of the first resistor is grounded;
the third end of the switch tube is respectively connected with the power output end of the power voltage stabilizing circuit and a second potential point of the power-off protection circuit;
one end of the second capacitor and one end of the third capacitor are respectively connected with the power output end, and the other end of the second capacitor and the other end of the third capacitor are grounded.
The electrostatic protection circuit in the above embodiment includes a first diode, a second diode, a third diode, and a fourth diode;
the cathode of the first diode and the cathode of the second diode are respectively connected with the power input end; the anode of the first diode is connected with the anode of the third diode, and the anode of the second diode is connected with the anode of the fourth diode; the cathode of the third diode and the cathode of the fourth diode are grounded.
Further, the first diode and the fourth diode are unidirectional transient suppression diodes.
The start-up protection circuit in the above embodiment includes a second resistor, a fourth capacitor, and a fifth capacitor;
the second resistor is connected with the fifth capacitor in parallel, one end of the second resistor is connected with the power input end, the other end of the second resistor is connected with one end of the fourth capacitor, the other end of the fourth capacitor is grounded, and the other end of the second resistor is connected with one end of the switch.
The switch tube in the above embodiment comprises a triode, a sixth diode, a seventh diode and an eighth diode;
the cathodes of the sixth diode and the seventh diode are connected with each other, the anode of the sixth diode is connected with the first end of the triode, and the anode of the seventh diode is connected with the second end of the triode;
the anode of the eighth diode is connected with the third end of the triode, and the cathode of the eighth diode is connected with the first end of the triode;
the first end, the second end and the third end of the triode respectively correspond to the first end, the second end and the third end of the switch tube.
The power-off protection circuit in the above embodiment includes a third resistor, a fifth diode, and a sixth capacitor;
one end of the third resistor is connected with one end of the sixth capacitor, the other end of the third resistor is used as the first potential point, and the other end of the sixth capacitor is used as the second potential point;
the cathode of the five diodes is connected with the first potential point, and the anode of the five diodes is connected with the second potential point.
Further, the first capacitor and the second capacitor are electrolytic capacitors.
Further, the power input end is used for connecting a direct current power supply, and the direct current power supply is less than or equal to 24 v.
Further, the switch comprises a key switch, a ship-shaped switch and a toggle switch.
Another embodiment of the present invention provides an electric device, including the above embodiment of the power voltage stabilizing circuit.
The technical scheme of the utility model has following advantage:
firstly, the electrostatic protection circuit in the power voltage stabilizing circuit is used for realizing electrostatic protection of the power voltage stabilizing circuit, and avoiding circuit element damage caused by the fact that friction charge generated by human body Static electricity or equipment Static electricity moves to a device sensitive to electrostatic discharge (ESD) when a user uses a switch to switch on a power supply.
And secondly, when the switch is closed, the buffer of the input current at the moment of closing the switch is realized through the starting protection circuit and the switch tube of the power voltage stabilizing circuit, so that the voltage at the moment of closing the switch is kept stable, the voltage is prevented from shaking instantly, electric sparks are avoided, and the stable working current can be obtained by the working energy of the rear-end power receiving equipment, so that the power utilization safety of the rear-end equipment is ensured, and the use experience of a user is improved.
Thirdly, when the switch is disconnected, the switch tube is protected by a power-off protection circuit of the power voltage stabilizing circuit in consideration of the influence of power-off on the switch tube, and the switch tube is prevented from being burnt out by overlarge current in power-off.
In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
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 schematic structural diagram of a power supply voltage stabilizing circuit according to a first embodiment of the present invention;
fig. 2 shows a schematic diagram of a power supply voltage stabilizing circuit according to a second embodiment of the present invention.
Description of the main element symbols:
10-an electrostatic protection circuit; 20-starting the protection circuit; 30-a switching tube; 40-a power-off protection circuit; r1 — first resistance; r2 — second resistance; r3 — third resistance; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; c4-fourth capacitance; c5 — fifth capacitance; c6 — sixth capacitance; d1 — first diode; d2 — second diode; d3 — third diode; d4 — fourth diode; d5-fifth diode; d6-sixth diode; d7-seventh diode; d8-eighth diode; q1-triode; SW 1-switch.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" 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. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
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 application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
In this embodiment, referring to fig. 1, a schematic diagram of a power supply voltage stabilizing circuit is shown.
As shown in fig. 1, the power supply voltage stabilizing circuit includes an electrostatic protection circuit 10, a start-up protection circuit 20, a power-off protection circuit 40, a switching tube 30, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, and a switch SW 1.
The input end of the electrostatic protection circuit 10, one end of the first capacitor C1, the input end of the start-up protection circuit 20 and the first end of the switch tube 30 are respectively connected with the power input end of the power supply voltage stabilizing circuit, and the other end of the first capacitor C1 is grounded; the first end of the switch tube 30 is connected with a first potential point of the power-off protection circuit 40; one end of the switch SW1 is connected to the second ends of the start-up protection circuit 20 and the switch tube 30, the other end of the switch SW1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is grounded; the third end of the switch tube 30 is respectively connected with the power output end of the power supply voltage stabilizing circuit and the second potential point of the power-off protection circuit 40; one end of the second capacitor C2 and one end of the third capacitor C3 are respectively connected with the power output end, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded.
The electrostatic protection circuit 10 implements electrostatic protection of the power supply voltage stabilizing circuit, and prevents a user from damaging circuit elements due to movement of frictional charges generated by human body static electricity or device static electricity to a device sensitive to electrostatic discharge (ESD) when the user switches on a power supply by using the switch SW 1; the protection circuit 20 and the switch tube 30 are started to buffer the input current at the closing moment of the switch SW1, so that the voltage at the closing moment of the switch SW1 is kept stable, the voltage is prevented from shaking instantly, electric sparks are avoided, the rear-end powered equipment can obtain stable working current during working, and the power utilization safety of the rear-end equipment is ensured; the power-off protection circuit 40 protects the switch tube 30 to prevent the switch tube 30 from being burnt out due to excessive current during power-off.
Further, the first capacitor C1 and the second capacitor C2 are electrolytic capacitors.
It can be understood that when the input voltage is high, power is absorbed through the first capacitor C1; when the input voltage is low, the first capacitor C1 releases electric energy to filter the interference of a higher current signal and a lower current signal when the power supply is switched on, so that the rear end obtains a smooth current signal.
Similarly, the second capacitor C2 allows the backend powered device to obtain a smooth current signal by absorbing power when the current signal is high and releasing power when the current signal is low. It can be understood that the third capacitor C3 is used to eliminate the inductive characteristic of the second capacitor C2 when the current signal is high, i.e. when the operating frequency is higher than the resonant frequency, the capacitor with larger capacity is prevented from showing the inductive characteristic.
It can be understood that the power input terminal is used for connecting a direct current power supply, and the direct current power supply is less than or equal to 24 v.
It will be appreciated that the switches SW1 include push button switches, rocker switches and toggle switches.
In the technical solution of this embodiment, firstly, the electrostatic protection circuit 10 in the power supply voltage stabilizing circuit is used to implement electrostatic protection of the power supply voltage stabilizing circuit, so as to prevent circuit elements from being damaged due to the movement of frictional charges generated by human body Static electricity or device Static electricity to a device sensitive to electrostatic discharge (ESD) when a user turns on the power supply by using the switch SW 1. Secondly, when the switch SW1 is closed, the start protection circuit 20 and the switch tube 30 of the power supply voltage stabilizing circuit buffer the input current at the closing moment of the switch SW1, so that the voltage at the closing moment of the switch SW1 is kept stable, the voltage is prevented from shaking instantaneously, electric sparks are avoided, the rear-end powered device can obtain stable working current during working, the power utilization safety of the rear-end device is ensured, and the use experience of a user is improved. Finally, when the switch SW1 is turned off, the power-off protection circuit 40 of the power supply voltage stabilizing circuit protects the switching tube 30 in consideration of the influence of power-off on the switching tube 30, so as to avoid the excessive current from burning the switching tube 30 during power-off.
Example 2
In the present embodiment, referring to fig. 2, the connection relationship of the respective elements in the electrostatic protection circuit 10, the connection relationship of the respective elements in the startup protection circuit 20, the connection relationship of the respective elements involved in the switching tube 30, and the connection relationship of the respective elements in the power-off protection circuit 40 are shown.
As shown in fig. 2, the electrostatic protection circuit 10 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The cathode of the first diode D1 and the cathode of the second diode D2 are respectively connected with the power input end; the anode of the first diode D1 is connected with the anode of the third diode D3, and the anode of the second diode D2 is connected with the anode of the fourth diode D4; the cathode of the third diode D3 and the cathode of the fourth diode D4 are grounded.
Further, the first diode D1 and the fourth diode D4 are unidirectional transient suppression diodes.
It can be understood that the electrostatic protection circuit 10 is used for implementing electrostatic protection to the switch tube 30, and the unidirectional transient suppression diode has an electrostatic discharge effect capable of releasing pulses exceeding 10000V and 60A and lasting for 10ms, can effectively absorb pulses causing device damage, can eliminate interference caused by the switch SW1 between buses, and can prevent components in the circuit from being affected by the electrostatic discharge effect and noise of the power supply of the switch SW1 to cause component failure.
As shown in fig. 2, the start-up protection circuit 20 includes a second resistor R2, a fourth capacitor C4, and a fifth capacitor C5. The second resistor R2 is connected in parallel with the fifth capacitor C5, one end of the second resistor R2 is connected with the power input end, the other end of the second resistor R2 is connected with one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is grounded, and the other end of the second resistor R2 is connected with the normally closed end of the switch SW 1.
It will be appreciated that when the switch SW1 is closed, the fifth capacitor C5 is used for filtering to enable the start protection circuit 20 to obtain a stable start signal; the second resistor R2 and the first resistor R1 are used for voltage division and providing a switch SW1 threshold value for the switch tube 30; the second resistor R2 and the fourth capacitor C4 form an RC circuit, the switch tube 30 is slowly turned on through slow charging and discharging of the RC circuit, and damage to a rear-end power receiving system caused by instant opening of an input power supply is avoided.
As shown in fig. 2, the switch tube 30 includes a transistor Q1, a sixth diode D6, a seventh diode D7, and an eighth diode D8; cathodes of the sixth diode D6 and the seventh diode D7 are connected to each other, an anode of the sixth diode D6 is connected to the first terminal of the transistor Q1, and an anode of the seventh diode D7 is connected to the second terminal of the transistor Q1; the anode of the eighth diode D8 is connected to the third terminal of the transistor Q1, and the cathode of the eighth diode D8 is connected to the first terminal of the transistor Q1; the first end, the second end and the third end of the triode Q1 correspond to the first end, the second end and the third end of the switching tube, respectively.
The SOT-23-6L comprises six pins, a P-channel MOS tube and three diodes, wherein the cathodes of the two diodes are connected with each other, the other two anodes of the two diodes are respectively connected with the grid and the source of the MOS tube, the two diodes with the cathodes connected with each other can protect the switch tube 30 and avoid breaking down the MOS tube when the current is too large, another diode is connected between the drain and the source of the MOS tube, the fourth pin of the SOT-23-6L corresponds to the source of the MOS tube, the third pin corresponds to the grid of the MOS tube, the first pin, the second pin, the fifth pin and the sixth pin correspond to the drain of the MOS tube, and the first pin, the second pin, the fifth pin and the sixth pin are connected to the same end of the circuit when in use, so that the heat can be effectively dissipated and the overcurrent protection function is realized.
As shown in fig. 2, the power-off protection circuit 40 includes a third resistor R3, a fifth diode D5, and a sixth capacitor C6. One end of the third resistor R3 is connected with one end of the sixth capacitor C6, the other end of the third resistor R3 is used as a first potential point, and the other end of the sixth capacitor C6 is used as a second potential point; the cathode of the five diode D5 is connected with the first potential point, and the anode of the five diode is connected with the second potential point.
Correspondingly, the first potential point is connected to the first end of the switch tube 30, and the second potential point is connected to the second end of the switch tube 30.
It can be understood that when the switch SW1 is turned off, the fifth diode D5 is used to protect the switch tube 30 and avoid burning out the switch tube 30 when the power is off; the third resistor R3 and the sixth capacitor C6 can ensure that the switching tube 30 obtains a stable working voltage, so that the voltage between the source and the drain of the switching tube 30 is distributed in an equalizing manner, and on the other hand, the third resistor R3 and the sixth capacitor C6 are used for realizing the protection of the switching tube 30.
Another embodiment of the present invention provides an electric device, including the above embodiment of the power voltage stabilizing circuit. The electrical devices may include, but are not limited to, chargers, converters, switching power supplies, power adapters, small home appliances such as notebooks, hair dryers, and curling irons, for example, wherein the power standby part may employ the power stabilizing circuit of the above-described embodiment for small home appliances.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended 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.
Claims (10)
1. A power supply voltage stabilizing circuit is characterized by comprising an electrostatic protection circuit, a starting protection circuit, a power-off protection circuit, a switching tube, a first capacitor, a second capacitor, a third capacitor, a first resistor and a switch;
the input end of the electrostatic protection circuit, one end of the first capacitor, the input end of the start protection circuit and the first end of the switch tube are respectively connected with the power supply input end of the power supply voltage stabilizing circuit, and the other end of the first capacitor is grounded;
the first end of the switching tube is connected with a first potential point of the power-off protection circuit;
one end of the switch is connected with the start protection circuit and the second end of the switch tube respectively, the other end of the switch is connected with one end of the first resistor, and the other end of the first resistor is grounded;
the third end of the switch tube is respectively connected with the power output end of the power voltage stabilizing circuit and a second potential point of the power-off protection circuit;
one end of the second capacitor and one end of the third capacitor are respectively connected with the power output end, and the other end of the second capacitor and the other end of the third capacitor are grounded.
2. The power supply voltage stabilizing circuit of claim 1, wherein the electrostatic protection circuit comprises a first diode, a second diode, a third diode, and a fourth diode;
the cathode of the first diode and the cathode of the second diode are respectively connected with the power input end; the anode of the first diode is connected with the anode of the third diode, and the anode of the second diode is connected with the anode of the fourth diode; the cathode of the third diode and the cathode of the fourth diode are grounded.
3. The power supply voltage regulation circuit of claim 2 wherein the first diode and the fourth diode are unidirectional transient suppression diodes.
4. The power supply voltage regulator circuit of claim 1, wherein the start-up protection circuit comprises a second resistor, a fourth capacitor, and a fifth capacitor;
the second resistor is connected with the fifth capacitor in parallel, one end of the second resistor is connected with the power input end, the other end of the second resistor is connected with one end of the fourth capacitor, the other end of the fourth capacitor is grounded, and the other end of the second resistor is connected with one end of the switch.
5. The power supply voltage stabilizing circuit of claim 1, wherein the switching tube comprises a triode, a sixth diode, a seventh diode, and an eighth diode;
the cathodes of the sixth diode and the seventh diode are connected with each other, the anode of the sixth diode is connected with the first end of the triode, and the anode of the seventh diode is connected with the second end of the triode;
the anode of the eighth diode is connected with the third end of the triode, and the cathode of the eighth diode is connected with the first end of the triode;
the first end, the second end and the third end of the triode respectively correspond to the first end, the second end and the third end of the switch tube.
6. The power supply voltage stabilizing circuit of claim 1, wherein the power-down protection circuit comprises a third resistor, a fifth diode, and a sixth capacitor;
one end of the third resistor is connected with one end of the sixth capacitor, the other end of the third resistor is used as the first potential point, and the other end of the sixth capacitor is used as the second potential point;
the cathode of the five diodes is connected with the first potential point, and the anode of the five diodes is connected with the second potential point.
7. The power supply voltage regulator circuit of claim 1, wherein the first capacitor and the second capacitor are electrolytic capacitors.
8. The power supply voltage regulation circuit of claim 7 wherein the power input is configured to receive a DC power supply, the DC power supply being less than or equal to 24 volts.
9. The power voltage regulator circuit of claim 8, wherein the switch comprises a push button switch, a rocker switch, and a toggle switch.
10. An electrical consumer comprising a power supply voltage regulator circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020113174.XU CN211089127U (en) | 2020-01-17 | 2020-01-17 | Power supply voltage stabilizing circuit and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020113174.XU CN211089127U (en) | 2020-01-17 | 2020-01-17 | Power supply voltage stabilizing circuit and electric equipment |
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| CN211089127U true CN211089127U (en) | 2020-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421710A (en) * | 2020-10-28 | 2021-02-26 | 深圳市泰祺科技有限公司 | Intelligent charging protection system and method for battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421710A (en) * | 2020-10-28 | 2021-02-26 | 深圳市泰祺科技有限公司 | Intelligent charging protection system and method for battery pack |
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