CN104362842A - Switching power supply and surge protection circuit and method adaptive to same - Google Patents

Switching power supply and surge protection circuit and method adaptive to same Download PDF

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Publication number
CN104362842A
CN104362842A CN201410558379.8A CN201410558379A CN104362842A CN 104362842 A CN104362842 A CN 104362842A CN 201410558379 A CN201410558379 A CN 201410558379A CN 104362842 A CN104362842 A CN 104362842A
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circuit
input
terminal
switching
voltage
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CN201410558379.8A
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Chinese (zh)
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陈惠强
徐立刚
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矽力杰半导体技术(杭州)有限公司
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Priority to CN201410558379.8A priority Critical patent/CN104362842A/en
Publication of CN104362842A publication Critical patent/CN104362842A/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0003Details of control, feedback and regulation circuits
    • H02M2001/0038Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • H02M2001/322Means for rapidly discharging a capacitor of the converter, in order to protect electrical components or prevent electrical shock

Abstract

The invention discloses a switching power supply and surge protection circuit and a method adaptive to the same. The switching power supply comprises a main power circuit provided with a main power tube. The method includes when the input voltage of the main power circuit is larger than or equal to a voltage threshold, preventing the input energy of the main power circuit from flowing towards the main power tube; when the input voltage of the main power circuit is smaller than the voltage threshold, allowing the input energy to flow towards the main power tube. According to the technical scheme, the main power tube can be protected more effectively, and the efficiency of the switching power supply can be improved effectively.

Description

开关电源及适用于开关电源的浪涌保护电路、方法 Switching power supply and surge protection circuit is adapted for switching power supply, the method

技术领域 FIELD

[0001] 本发明涉及电子领域,特别涉及一种开关电源及适用于开关电源的浪涌保护电路、方法。 [0001] The present invention relates to the field of electronics, and more particularly to a switching power supply surge protection switching power supply circuit is adapted to process.

背景技术 Background technique

[0002] 开关电源(英文!Switching Mode Power Supply)又称开关电源,是一种高频化电能转换装置。 [0002] The switching power supply (English! Switching Mode Power Supply), also known as switching power supply, a high-frequency electric energy conversion device. 开关电源是利用现代电力电子技术,控制开关管开通和断开的时间比率,维持稳定输出电压的一种电源。 Switching power supply is the use of modern power electronics, control switch on and off time ratio of a power supply to maintain a stable output voltage.

[0003] Buck开关电源(降压型开关电源)是开关电源的一种,在Buck开关电源中,如果输入端瞬间有大能量输入即存在输入浪涌的情形时,产生的浪涌能量会叠加在开关电源的功率级电路的输入能量上,使主功率级电路中的主功率管(一般为=MOSFET开关管)上的能量大于该主功率管的所能承受的最大能量,从而导致主功率管损坏,甚至造成其他器件损坏。 [0003] Buck switching power source (step-down switching power supply) is a switching power supply, the switching power supply in Buck, if the input moment that there is a large energy input in the case when the input surge, the surge energy generated superimposed the input energy to the power stage circuit switching power supply, the main power stage circuit main power transistor (typically = MOSFET switch) is greater than the energy of the maximum energy can withstand the power of the main tube, causing the main power tube is damaged or even cause damage to other devices.

[0004] 在Buck开关电源中,尤其是在将交流电压转换成直流电压的AC/DC型Buck开关电源(AD-DC Buck开关电源)中,浪涌能量最容易造成主功率管的损坏,因此需要采取必要的措施来吸收浪涌能量,避免主功率管上承受的能量超过其所能承受的最大能量,以保护主功率开关器件及其它器件。 [0004] In the Buck switching power supply, particularly when the AC voltage into a DC voltage of the AC / DC switching power source Buck type (AD-DC Buck switching power supply), the surge energy most likely to cause damage to the main power tube, thus need to take the necessary measures to absorb surge energy, maximum energy to avoid receiving the main power transistor exceeds its energy can bear, in order to protect the main power switching devices and other devices.

[0005] 图1为现有技术的一种适用于Buck开关电源的浪涌保护电路。 [0005] FIG. 1 is a prior art surge protection circuit suitable for Buck switching power supply.

[0006] 参见图1所示,为了实现浪涌保护,在AC/DC型Buck开关电源的整流桥的前端并联有一压敏电阻RV1,即压敏电阻RVl连接在交流电源输入端的N线和L线之间,通过压敏电阻RVl来吸收浪涌的能量,从而避免输出至Buck开关电源输出端的能量过大,使加在主功率管Ql的能量过大而损坏主功率管Ql。 [0006] Referring to FIG. 1, in order to achieve surge protection, there is a varistor RV1, i.e. RVl varistor connected to the AC power input line N and L in parallel with the front end of the bridge rectifier AC / DC switching power supply type Buck between the lines, the surge energy is absorbed by the varistor RVl, thereby avoiding output to the output terminal of the Buck switching power supply becomes excessive, so that added to the main power transistor Ql can be excessive damage to the main power transistor Ql.

[0007] 本发明人在进行本发明的研究过程中发现,图1所示现有技术存在以下的缺陷: [0007] The present inventors have studied the process of carrying out the present invention found the following defects in the prior art shown in FIG 1:

[0008] 压敏电阻RVl吸收浪涌能量的能力与流过压敏电阻RVl的漏电流成正相关关系,而只有在叠加了浪涌能量的输入电压很大的情况下流过压敏电阻RVl的漏电流才比较大,此时采用压敏电阻能很好地吸收浪涌能量,然而此时的主功率管Ql可能已经由于所承受的能量过大而被损坏掉了。 [0008] The ability of the varistor and the surge energy absorption RVl leakage current flowing through the varistor RVl positive correlation, and only the superimposed input voltage surge energy flowing through the case of large leakage of varistor RVl current was relatively large, this time using varistor surge energy can be absorbed well, but this time the main power transistor Ql may have been due to bear too much energy out being damaged. 因此采用压敏电阻来吸收浪涌能量,虽然浪涌保护电路结构简单,却并不能对主功率管实现可靠的保护。 Thus varistors to absorb surge energy, the surge protection circuit configuration is simple, but can not achieve reliable protection of the main power transistor.

[0009] 图2为现有技术的另一种适用于AC/DC型Buck开关电源的浪涌保护电路。 [0009] Figure 2 is another prior art surge protection circuit suitable for AC / DC Buck type switching power supply.

[0010] 参见图2所示,在现有技术中,在Buck开关电源的直流输入电容C2的两端并联一RCD电路。 [0010] Referring to FIG. 2, in the prior art, both ends of the DC power supply input Buck switching capacitor C2 is a parallel circuit RCD. 该RCD电路由二极管D5、电阻R5和电容C5组成。 The RCD circuit by the diode D5, resistor R5 and capacitor C5 form. 从而利用电容C5来吸收浪涌的能量,以防止输入至主功率级电路的能量过大而使主功率管Ql损坏。 Using capacitor C5 thereby to absorb the surge energy to prevent the power input to the primary stage circuit can be excessive damage to the main power transistor Ql. .

[0011] 本发明人在进行本发明的研究过程中发现,如图2所示的现有技术存在以下的缺陷: [0011] The present inventors have studied the process of carrying out the present invention found the following defects in the prior art shown in Figure 2:

[0012] 采用上述RCD电路来吸收浪涌的能量,需要在Buck开关电源中另外引入大量器件,使得电路的结构复杂且不易集成,造成开关电源的体积过大。 [0012] With the above RCD circuit to absorb the surge energy, the introduction of a large number of devices require additional Buck switching power supply, so that the complex integrated circuit structure and difficult, resulting in too large volume of a switching power supply. 此外,电容C5吸收浪涌能量的能力与电容C5自身的容值有关,其容值越大,其吸收浪涌能量的能力也越强,然而采用大容值的电容会进一步造成开关电源的体积过大,且电路成本也较高。 Further, the capacitor C5 surge energy absorption capacity of the capacitor C5 and the capacitance value relating to itself, the greater the capacitance value, its ability to absorb surge energy is the stronger, however, using a large capacitance capacitor further cause the volume of the switching power supply It is too large, and the circuit cost is high.

发明内容 SUMMARY

[0013] 本发明实施例目的在于提供:一种开关电源及适用于开关电源的浪涌保护电路、方法。 [0013] Example embodiment of the present object of the invention is to provide: a switching power supply and surge protection switching power supply circuit is adapted to process. 在发生输入浪涌时,应用该技术方案对开关电源的主功率管的保护更加有效。 When input surge occurs, the application of the technical solution to protect the primary power transistor switching power supply is more efficient. 且有利于提闻开关电源的效率。 And beneficial to provide audible switching power supply efficiency.

[0014] 第一方面,本发明实施例提供的一种适用于开关电源的浪涌保护方法,所述开关电源具有主功率级电路,所述主功率级电路中设置有主功率管,所述方法包括: [0014] In a first aspect, the switching power supply suitable for surge protection method according to an embodiment of the present invention, the switching power supply circuit with a main power stage, the main circuit of the power stage is provided with a main power transistor, the methods include:

[0015] 当所述主功率级电路的输入电压大于或等于阈值电压时,使输入至所述主功率级电路的输入能量不流向所述主功率管; [0015] When the input voltage of the main power stage circuit voltage is greater than or equal to the threshold, the power input to the primary energy input stage circuit does not flow to the main power transistor;

[0016] 当所述输入电压小于所述阈值电压时,使所述输入能量流向所述主功率管。 [0016] When the input voltage is less than the threshold voltage, the input energy is flowing to the main power transistor.

[0017] 结合第一方面,在第一种实现方式下,所述主功率级电路包括输出电容, [0017] with the first aspect, in the first implementation, the main power stage circuit includes an output capacitor,

[0018] 当所述输入电压大于或等于所述阈值电压时,让所述输入能量经过所述输出电容被泄放,使所述输入能量不流向所述主功率管。 [0018] When the input voltage is greater than or equal to the threshold voltage, so that the input energy is vented through the output capacitor, the input energy is not flowing to the main power transistor.

[0019] 第二方面,本发明实施例提供的一种适用于开关电源的浪涌保护电路,所述开关电源包括主功率级电路,所述主功率级电路包括耦接在所述主功率级电路的电压输入端与地之间的主功率管, [0019] a second aspect, the switching power supply suitable for surge protection circuit according to an embodiment of the present invention, the switching power supply includes a main power stage circuit, said primary circuit comprises a power stage coupled to the main power stage main power transistor between a voltage input terminal and circuit ground,

[0020] 所述保护电路包括输入电压检测电路、以及开关电路, [0020] The protection circuit includes an input voltage detecting circuit, and a switching circuit,

[0021 ] 所述输入电压检测电路用于检测所述电压输入端的输入电压与一阈值电压的大小关系,并输出检测结果, [0021] The input voltage detection circuit for detecting the magnitude relationship between the input voltage and the voltage input terminal of a threshold voltage, and outputs a detection result,

[0022] 所述开关电路的第一端耦接到所述主功率管的第一极性端,第二端耦接到地,开关控制端与所述输入电压检测电路的输出端连接,其中,所述主功率管的第一极性端耦接到所述电压输入端, [0022] The first terminal coupled to the first switch circuit polar end of said main power transistor, a second terminal coupled to ground, the input terminal switching control output of the voltage detection circuit, wherein , the first polarity end of said main power transistor coupled to the voltage input terminal,

[0023] 当所述输入电压大于或等于所述阈值电压时,所述开关电路导通,使输入至所述主功率级电路的输入能量通过所述开关电路泄放至地, [0023] When the input voltage is greater than or equal to the threshold voltage, the switching circuit is turned on, the main power input to the stage input energy bleed circuit to the ground through the switching circuit,

[0024] 当所述输入电压小于所述阈值电压时,所述开关电路断开,所述输入能量流向所述主功率管。 [0024] When the input voltage is less than the threshold voltage, the switching circuit is turned off, the energy input of the main power flow tube.

[0025] 结合第二方面,在第一种实现方式下,所述主功率级电路包括输出电容,所述输出电容的第一端耦接到所述电压输入端,第二端耦接到所述主功率管的第一极性端, [0025] combination with the second aspect, in the first implementation, the main power stage circuit includes an output capacitor, the first output terminal coupled to the voltage input terminal of the capacitor, a second terminal coupled to the said first polar end of the main power transistor,

[0026] 所述开关电路的第一端通过所述主功率级电路的输出电容耦接到所述电压输入端, The [0026] a first terminal of the switch circuit through the main circuit of the power stage output capacitor coupled to the voltage input terminal,

[0027] 当所述输入电压大于或等于所述阈值电压时,所述输入能量经过所述输出电容和所述开关电路泄放至地, [0027] When the input voltage is greater than or equal to the threshold voltage, the input energy to the output capacitor through the switching circuit and the bleeding to the ground,

[0028] 当所述输入电压小于所述阈值电压时,所述输入能量通过所述输出电容流向所述主功率管。 [0028] When the input voltage is less than the threshold voltage, the input capacitance of the energy flow through the output of said main power transistor.

[0029] 结合第二方面,在第一种实现方式下,所述开关电路为一泄放开关, [0029] combination with the second aspect, in the first implementation mode, the switching circuit is a bleed switch,

[0030] 所述泄放开关的第一极性端为所述开关电路的第一端,第二极性端为开关电路的第二端,控制端为所述开关电路的开关控制端。 [0030] bleed said first polarity terminal of the switch to a first terminal of said switching circuit, the second polarity terminal of the switching circuit of the second terminal, a control terminal of the switching control terminal of the switch circuit.

[0031] 结合第二方面,在第一种实现方式下,所述开关电路包括一泄放开关、以及一泄放电容, [0031] combination with the second aspect, in the first implementation mode, the switching circuit comprises a bleed switch, and a drain capacitor,

[0032] 所述泄放电容的第一端为所述开关电路的第一端,第二端与所述泄放开关的第一极性端相连, [0032] The first end of the drain capacitor to the first terminal of the switch circuit, a second terminal connected to a first end of the bleed polarity switch,

[0033] 所述泄放开关的第二极性端为所述开关电路的第二端,控制端为所述开关电路的开关控制端。 A second polar end [0033] of the bleed switch to a second terminal of said switching circuit, control terminal of the switching control terminal of the switch circuit.

[0034] 结合第二方面,在第一种实现方式下,所述输入电压检测电路包括: [0034] combination with the second aspect, in the first implementation, the input voltage detection circuit comprises:

[0035] 输入电压米样电路,用于获取所述输入电压的米样信号; [0035] m an input voltage sampling circuit, configured to obtain rice samples the input voltage signal;

[0036] 比较电路,用于比较所述采样信号与表征所述阈值电压的参考信号,并向所述开关电路的开关控制端输出比较信号作为所述检测结果。 [0036] The comparing circuit for comparing the reference signal with the sampling signal characterizing the threshold voltage, switch to the control terminal of the switching circuit outputs the comparison signal as the detection result.

[0037] 第三方面,本发明实施例提供的一种开关电源,所述开关电源包括: [0037] a third aspect, a switching power supply according to an embodiment of the present invention, the switching power supply comprising:

[0038] 主功率级电路,包括耦接在主功率级电路的电压输入端与地之间的主功率管; [0038] The main power stage circuit comprising coupled between ground and the voltage input terminal of the main power stage of the main power transistor circuit;

[0039] 还包括上述任意一所述的浪涌保护电路,所述浪涌保护电路与所述主功率级电路相连。 [0039] A surge protection circuit further comprising any one of the above said, the surge protection circuit connected to the main power stage circuit.

[0040] 结合第三方面,在第一种实现方式下,所述主功率级电路包括输出电容, [0040] reference to the third aspect, in the first implementation mode, the main power stage circuit includes an output capacitor,

[0041] 所述输出电容的第一端耦接到所述电压输入端,第二端耦接到所述主功率管的第一极性端。 [0041] The output terminal of the first capacitor is coupled to the voltage input terminal, a second terminal coupled to the first polarity end of said main power transistor.

[0042] 结合第三方面,在第一种实现方式下,所述主功率级电路包括一电感、以及一整流二极管, [0042] reference to the third aspect, in the first implementation mode, the main power stage circuit includes an inductor, and a rectifier diode,

[0043] 所述电感的连接在所述输出电容的第二端和所述主功率管的第一极性端之间, [0043] The inductor is connected to a first polarity terminal of the output capacitor second end and between said main power transistor,

[0044] 所述整流二极管的阴极与所述电压输入端连接,阳极与所述主功率管的第一极性端连接。 [0044] The cathode of the rectifier diode connected to the voltage input terminal, an anode terminal of a first polarity is connected to the main power transistor.

[0045] 由上可见,应用本实施例技术方案,本实施例通过检测主功率级电路的输入电压与设定的阈值电压的大小关系,而确定当前输入主功率级电路的输入能量是否过大,从而确定当前主功率管是否存在被损坏的风险,一旦输入电压大于或者等于阈值电压时,便使输入能量泄放出去,而不流入主功率管,以对主功率管进行保护。 [0045] seen from the above, the application of the technical solution of the present embodiment, the magnitude relation between the threshold voltage is illustrated by the input voltage detecting master power stage circuit and the setting of the present embodiment, determines the current input of the main power stage circuit, the input energy is too large , thereby determining whether or not the current main power transistor risk of being damaged, once the input voltage is greater than or equal to the threshold voltage, the input energy will bleed out, without flowing into the main power transistor, in order to protect the main power transistor. 可见,相对于现有技术,本实施例对主功率管的保护更加有效,效率更高。 It is seen, with respect to the prior art, embodiments of the present embodiment main power transistor protection more effective, more efficient.

[0046] 相对于在主功率级电路的前级电路进行浪涌能量吸收的现有技术,本实施例通过检测主功率级电路的电压输入端的输入电压,以在输入电压达到或者超过设定的阈值电压时,才泄放输入至主功率级电路的输入能量,而使输入能量不流向主功率管,从而避免较大的输入能量对主功率管的影响,实现了对主功率管的有效保护;并且由于对输入电压进行了检测,可精确地控制输入能量的泄放,避免能量的过度浪费,可有效的提高开关电源的效率。 [0046] with respect to the prior art for absorbing surge energy at the preceding stage circuit of the main circuit of the power stage, by the present embodiment detects the input voltage of the main power stage input terminal to the input voltage reaches or exceeds a set when the threshold voltage, the input energy was input to the primary bleed power stage circuit, the input energy does not flow to main power transistor, so as to avoid a greater impact on the main power input energy tube, to achieve an effective protection of the main power transistor ; and since the input voltage detection, can be precisely controlled bleed energy input, to avoid excessive waste of energy, which can effectively improve the efficiency of the switching power supply.

附图说明 BRIEF DESCRIPTION

[0047] 图1为现有技术的一种适用于Buck开关电源的浪涌保护电路; [0047] FIG. 1 is a prior art surge protection circuit suitable for Buck switching power supply;

[0048] 图2为现有技术的另一种适用于Buck开关电源的浪涌保护电路; [0048] FIG. 2 is a prior art Buck another for power surge protection circuit switch;

[0049] 图3为本实施例1提供的适用于开关电源的浪涌保护方法流程示意图; Surge protection is provided a process of the method applied to the switching power supply schematic [0049] The present embodiment 3;

[0050] 图4为本实施例2提供的一种适用于开关电源的浪涌保护电路的电路结构示意图; [0050] FIG. 4 is a schematic configuration example 2 to provide a suitable switching power supply circuit of the surge protection circuit of the present embodiment;

[0051] 图5为本实施例3提供的在图5所示开关电源中应用本实施例浪涌保护方案的一种电路实施结构示意图; [0051] FIG. 5 is a schematic structural diagram of the switching power supply shown in Figure 5. A circuit according to the present embodiment is applied surge protection schemes provided by the embodiment of Example 3 embodiment;

[0052] 图6为本实施例3提供的在在图5所示开关电源中应用本实施例浪涌保护方案的另一种电路实施结构不意图; [0052] FIG. 6 is provided in the embodiment 3 in the switching power supply circuit according to another application of the present configuration example of a surge protection schemes are not intended to embodiments shown in the embodiment of FIG 5;

[0053] 图7为本实施例4提供的在图7所示开关电源中应用本实施例浪涌保护方案的一种电路实施结构示意图; [0053] FIG 74 provides a schematic diagram of the switching power supply shown in Figure 7 of the present embodiment is applied to a circuit configuration example of a surge protection scheme embodiment of the present embodiment;

[0054] 图8为本实施例4提供的在图7所示开关电源中应用本实施例浪涌保护方案的另一种电路实施结构示意图。 [0054] Figure 8 a schematic view of another application of the present embodiment in the switching power supply shown in FIG. 7 embodiment of the surge protection circuit according to the scheme provided in the present configuration example 4 embodiment.

具体实施方式 Detailed ways

[0055] 下面将结合附图以及具体实施例来详细说明本发明,在此本发明的示意性实施例以及说明用来解释本发明,但并不作为对本发明的限定。 [0055] and the following with reference to specific embodiments of the present invention will be described in detail, in this exemplary embodiment of the present invention serve to explain and illustrate the present invention but are not intended to limit the present invention.

[0056] 实施例1: [0056] Example 1:

[0057] 图3为本实施例提供的一种适用于开关电源的浪涌保护方法流程示意图,参见图3所示,该方法主要包括: A suitable switching power supply surge protection method provided by the embodiment shown a schematic flow [0057] The present embodiment 3, see FIG. 3, the method including:

[0058] 步骤301:当输入电压大于或等于阈值电压时,使输入至主功率级电路的输入能量不流向主功率管。 [0058] Step 301: when the input voltage is greater than or equal to the threshold voltage, the power input to the primary stage circuit does not flow to main power input energy tube.

[0059] 本实施例开关电源包括主功率级电路,该主功率级电路中设置有主功率管,通过控制主功率管的导通和关断,以将输入至功率级电路的输入电压转换成负载所需要的电压输出。 [0059] The embodiment of the switching power supply according to the present embodiment includes a main power stage circuit, the main power stage circuit is provided with a main power transistor, by controlling the main power transistor is turned on and off so as to input to the input voltage of the power stage circuit into output voltage required by the load.

[0060] 本实施例以及后面所有的实施例中所述的输入电压是指输入至功率级电路的电压输入端的电压,即输入至主功率级电路的直流输入电压。 [0060] The present embodiment the input voltage and all subsequent embodiments described in the embodiment means that the input to the power stage circuit input voltage, i.e., the primary input to the DC input voltage of the power stage circuit.

[0061] 在本实施例以及后面所有的实施例中所述阈值电压根据主功率管的击穿电压、所能承受的最大能量以及当前开关电源电路结构的各相关参数设定,其相当于功率级电路安全工作电压的上限值,一旦输入电压达到该阈值电压时,输入至主功率管的能量便可能使主功率管损坏。 [0061] In the present embodiment, all of the embodiments and the following examples the maximum energy threshold voltage according to the breakdown voltage of the main power tube, and can withstand the relevant parameter setting circuit configuration of a switching power supply current, which corresponds to the power the upper limit of the safe operating voltage level circuit, once the input voltage reaches the threshold voltage, the energy input to the main power transistor can make the main power transistor damage.

[0062] 当输入电压大于或等于阈值电压时,使输入至主功率级电路的输入能量被泄放掉,而不流向主功率管,避免浪涌能量损坏主功率管。 [0062] When the input voltage is greater than or equal to the threshold voltage, the power input to the primary stage circuit input energy is exhausting, and not to the main power transistor, to avoid damage to the main power surge energy tube. 其中,具体的用于泄放输入能量的电路设置可以但不限于参见实施例2、3中关于开关电路的描述。 Wherein the circuit is provided for the specific input energy may bleed, but are not limited to the described embodiment about 2,3 switching circuit See FIG.

[0063] 步骤302:当输入电压小于阈值电压时,使输入能量流向主功率管。 [0063] Step 302: when the input voltage is less than the threshold voltage, the energy input to the main power transistor.

[0064] 当当前输入电压小于阈值电压时,不泄放输入至功率级电路的输入能量(使用于泄放能量的电路断开或不工作),使输入能量流向主功率管,开关电源正常工作。 [0064] When the input voltage is less than this threshold voltage, no bleed energy input to the power input stage circuit (bleeder circuit used in the open or inoperative energy), the energy input to the main power transistor, the switching power supply work .

[0065] 由上可见,应用本实施例技术方案,本实施例通过检测主功率级电路的输入电压与预设的阈值电压的大小关系,而确定当前输入主功率级电路的输入能量是否过大,从而确定当前主功率管是否存在被损坏的风险,一旦输入电压大于或者等于阈值电压时,便使输入能量泄放出去,而不流入主功率管,以对主功率管进行保护。 [0065] seen from the above, the application of the technical solution of the present embodiment, for example, by the input voltage detecting main power stage circuit with a preset threshold voltage magnitude relation between the present embodiment, determines the current input of the main power stage circuit, the input energy is too large , thereby determining whether or not the current main power transistor risk of being damaged, once the input voltage is greater than or equal to the threshold voltage, the input energy will bleed out, without flowing into the main power transistor, in order to protect the main power transistor. 可见,相对于现有技术,本实施例对主功率管的保护更加有效、可靠。 It is seen, with respect to the prior art, embodiments of the present embodiment main power transistor protection more effective, and reliable.

[0066] 相对于现有技术在主功率级电路的前级电路进行浪涌能量吸收的技术方案,本实施例通过检测主功率级电路的电压输入端的输入电压,只有在输入电压达到或者超过设定的阈值电压时,才泄放输入至主功率级电路的输入能量,使输入能量不流向主功率管,从而避免了较大的输入能量对主功率管的影响,实现了对主功率管的有效保护;并且,本实施例对输入电压进行了检测,只有在输入电压达到或者超过设定的阈值电压时,才泄放输入能量,故应用本实施例可精确的控制对输入能量泄放的控制,避免能量的过度浪费,可有效的提闻开关电源的效率。 [0066] with respect to the prior art technical solutions for absorbing surge energy at the preceding stage of the main circuit of the power stage circuit, this embodiment, the input voltage of the voltage detection input terminal of the main power stage circuit, only when the input voltage reaches or exceeds the set given threshold voltage, input to the input energy was bleed main power stage circuit, the input energy is not flowing to the main power transistor, thus avoiding the large input of energy of the primary power transistor, the realization of the main power transistor effectively protected; and, according to the present embodiment, the input voltage detection, only when the input voltage reaches or exceeds the set threshold voltage, the input energy bleed only, so the application of the present embodiment can accurately control the input power of bleeder controlled to avoid excessive waste of energy, which can effectively provide audible switching power supply efficiency.

[0067] 实施例2: [0067] Example 2:

[0068] 本实施例提供一种适用于开关电源的浪涌保护电路,该开关电源具有一主功率级电路,该主功率级电路中具有一主功率管(记为Ql),主功率管Ql耦接在主功率级电路的电压输入端(记为G)与地之间,通过控制主功率管Ql的导通和关断,以将输入至功率级电路的输入电压(记为Vg)转换成负载所需要的电压输出。 [0068] The present embodiment provides a switching power supply suitable for surge protection circuit of the switching power supply circuit having a main power stage, of the main power stage circuit having a main power transistor (referred to as Ql), main power transistor Ql coupled voltage input terminal of the main power stage circuit (referred to as G) between and, by controlling the main power transistor Ql is turned on and off to the power input to the input stage circuit voltage (referred to as Vg) conversion into the output voltage required by the load. 其中,开关电源的具体电路结构可以但不限于参见图5、7所示意。 Wherein, the specific circuit structure of the switching power supply can be but is not limited to the illustrated Referring to FIG. 5,7.

[0069] 参见图4所示,本实施例的浪涌保护电路主要包括输入电压检测电路4001、以及开关电路4002。 [0069] Referring to FIG. 4, the surge protection circuit according to the present embodiment mainly includes an input voltage detection circuit 4001, and a switching circuit 4002.

[0070] 其中,输入电压检测电路4001用于检测输入电压Vg与预设的阈值电压的大小关系,并输出检测结果:当前输入电压Vg是大于或者等于阈值电压,还是小于阈值电压。 [0070] wherein the input voltage detection circuit 4001 for detecting the magnitude relation between the input voltage Vg with a preset threshold voltage, and outputs a detection result: the current input voltage Vg is greater than or equal to the threshold voltage or less than the threshold voltage.

[0071] 本实施例的浪涌保护电路与开关电源连接时,使开关电路4002的一端(记为第一端SI)耦接到主功率管Ql的第一极性端,其中该第一极性端为主功率管Ql耦接到电压输入端G的一极性端,使开关电路4002的另一端(记为第二端S2)耦接到地,使开关电路4002的开关控制端K与输入电压检测电路4001的输出端连接。 When [0071] The surge protection circuit according to the present embodiment, the switching power supply is connected to one end of the switch circuit 4002 (referred to as a first terminal SI) coupled to the first polarity terminal of the main power transistor Ql, wherein the first electrode end of the main power transistor Ql is coupled to a polarity of the terminal voltage of the input terminal G, the other terminal of the switch circuit 4002 (referred to as a second end S2) coupled to ground, the switch circuit 4002 and the switching control terminal K input voltage detection circuit 4001 is connected to the output terminal. 在实现浪涌保护控制时,通过控制开关控制端K的控制信号而控制开关电路4002的导通以及断开,即控制开关电路4002的第一端SI到第二端S2之间的导通以及断开。 In carrying out the surge protection control, by controlling the switching control terminal of the K control signal controlling the switch circuit 4002 is turned on and turned off, i.e., controlling the switch circuit 4002 is turned between a first end to a second end and S2 SI disconnect.

[0072] 当输入电压Vg大于或等于预定的阈值电压时,开关电路4002处于导通状态,使输入至主功率级电路的输入能量通过开关电路4002泄放至地;当输入电压Vg小于阈值电压时,开关电路4002处于断开状态,输入能量流向主功率管。 Input Energy [0072] When the input voltage Vg is greater than or equal to a predetermined threshold voltage, the switch circuit 4002 is in the ON state, the input to the main power stage circuit through the switch circuit 4002 bleed to ground; when the input voltage Vg is less than the threshold voltage when, the switch circuit 4002 is in the OFF state, the energy input to the main power transistor.

[0073] 本实施例浪涌保护电路400的进步详细的工作原理以及有益效果可以参见实施例I中的描述,在此不作赘述。 [0073] The surge protection circuit according to the present embodiment advances detailed embodiment works and 400 may refer to the beneficial effects described in Embodiment Example I, this will not be repeated herein.

[0074] 作为本实施例的示意,本实施例浪涌保护电路的输入电压检测电路4001可以但不限于采用输入电压采样电路40011、以及比较电路40012实现。 [0074] As an illustrative embodiment of the present embodiment, the input voltage detection circuit 4001 cases surge protection circuit according to the present embodiment may be employed but are not limited to the input voltage sampling circuit 40011, 40012 and a comparison circuit implementation.

[0075] 其中,输入电压采样电路40011与主功率电路的电压输入端G连接,从而采样得到表征当前输入电压Vg的米样电压Vsen。 [0075] where the input voltage sampling circuit 40011 is connected to the voltage input terminal G of the main power circuit to the sampled input voltage Vg indicating current voltage meter sample Vsen.

[0076] 譬如如图4所示,本实施例可以在主功率级电路的电压输入端G上连接由相互串联的第一电阻Rsl、第二电阻Rs2的电阻分压电路来作为本实施例的输入电压采样电路40011,以第一电阻Rsl、第二电阻Rs2连接的节点处作为输入电压采样电路40011的输出端,输出采样电压Vsen。 [0076] The example shown in Figure 4, the present embodiment may be connected by a first resistor Rsl connected in series, a second resistance Rs2 of the resistor divider circuit at the voltage input terminal G of the main power stage circuit as an embodiment according to the present embodiment 40011 input voltage sampling circuit, a first resistor Rsl, Rs2 node of the second resistor is connected as an input voltage sampling circuit 40011 output terminal, an output sample voltage Vsen.

[0077] 比较电路40012比较采样电压Vsen与表征阈值电压的参考电压Vref的大小,输出表征当前检测结果的比较信号。 [0077] The comparison circuit 40012 compares the sampled voltage Vsen magnitude and characterization threshold voltage value of the reference voltage Vref, and outputs a detection result indicating current comparison signal.

[0078] 作为本实施例的示意,参见图4所示,本实施例可以采用比较器COMP实现比较电路10012,使比较器COMP的第一输入端(图4中以正向输入端“ + ”为例)连接输入电压采样电路40011的输出端,接入采样电压Vsen,在比较器COMP的第二输入端(图4中以正向输入端为例)接入参考电压Vref,比较器COMP输出端与开关电路4002的开关控制端连接,向开关电路4002的开关控制端K输出表征检测结果(即输入电压Vg与阈值电压的大小关系)的比较信号,通过比较信号控制开关电路4002的导通以及关断。 [0078] As an illustrative embodiment of the present embodiment, referring to FIG. 4, the present embodiment may be implemented using the comparator COMP the comparison circuit 10012, the first input of the comparator COMP (FIG. 4 in the positive input terminal "+" Example) 40011 input is connected the output terminal voltage sampling circuit, the sampling voltage Vsen access, at a second input terminal (in FIG. 4 as an example to the positive input) of the comparator COMP access reference voltage Vref, the comparator output COMP switch control terminal terminal of the switch circuit 4002 is connected to the switch control terminal K outputs characterizing the detection result of the switch circuit 4002 (i.e., input voltage Vg and the threshold voltage magnitude relationship) of the comparison signal by comparing the signal controlling the switch circuit 4002 is turned on and shutdown.

[0079] 实施例3: [0079] Example 3:

[0080] 本实施例以在一种开关电源中应用本实施例浪涌保护电路为例,对本实施例的浪涌保护电路的应用进行示意性说明。 [0080] In this embodiment, applications of the present embodiment In one embodiment of a surge protection circuit of the switching power supply, for example, the application of the surge protection circuit according to the present embodiment will be schematically described.

[0081] 参见图5所示,本实施例的开关电源包括主功率级电路,其主功率级电路主要包括主功率管Ql、整流二极管D2、电感L、以及输出电容C3。 [0081] Referring to FIG 5, the switching power supply according to the present embodiment includes a main power stage circuit, the main power stage circuit includes a main power transistor Ql, mainly, a rectifying diode D2, an inductor L, and an output capacitor C3.

[0082] 其中,整流二极管D2的阴极输出电容C3的第一端(图5中端部A)共同与主功率级电路的电压输入端G连接,主功率管Ql的第一极性端(源极“S”或漏极“D”中的一个,图5以漏极“D”为例)与整流二极管D2的阳极“ + ”以及电感L的第一端共同连接从而耦接到电压输入端G,主功率管Ql的第二极性端(源极“S”或漏极“D”中的另一个,图5以源极“S”为例)通过电阻Rl连接到地,输出电容C3的第二端(图5中端部B)与电感L的第二端连接,通过电感L耦接到主功率管Ql的第一极性端。 [0082] wherein the cathode of the rectifier diode D2 output capacitor C3, a first end (end portion in FIG. 5 A) is connected to the common voltage input terminal G of the main power stage circuit, a first end of the main power transistor Ql polarity (source a pole "S" or a drain "D" in FIG. 5 to the drain "D" for example) are commonly connected to the anode "+" and the first terminal of the inductor L rectifying diode D2 is coupled to a voltage input so that G, the second end of the main power transistor Ql polarity (the other of the source "S" or a drain "D" in FIG. 5 to the source "S" for example) connected to ground, the output capacitor C3 through the resistor Rl a second end (end portion in FIG. 5 B) connected to the second terminal of the inductor L, through the inductor L is coupled to a first polarity terminal of the main power transistor Ql.

[0083] 作为本实施例的示意,在本实施例开关电源中,由于主功率管Ql与输出电容C3串联在电压输入端G与地之间,输入能量会加载在输出电容C3上,故本实施例可以通过输出电容C3来吸收并泄放输入能量。 [0083] As an illustrative embodiment of the present embodiment, in the present embodiment, the switching power supply, since the main power transistor Ql and the output capacitor C3 connected in series between the voltage input terminal G, the input energy will be loaded on the output capacitor C3, so the Example can be absorbed by the energy input and the bleed output capacitor C3. 这样,如图5所示,实施例2中图4所示的浪涌保护电路400中的开关电路4002可以由一泄放开关实现,该泄放开关采用图5所示的开关管Q2实现。 Thus, as shown in Figure 5, the surge protection circuit shown in FIG. 2 embodiment the switching circuit 4002 in the embodiment 4 of the switch 400 may be implemented by a bleed, bleed switch with the switching transistor Q2 shown in Fig achieved.

[0084] 参见图5所示,本实施例开关管Q2的第一极性端(源极“S”或漏极“D”中的一个,图5以漏极“D”为例)作为开关电路4002的第一端SI,连接到电输出电容C3的第二端(端部B处),从而通过电感L耦接到主功率管Ql的漏极“D”,开关管Q2的第二极性端(源极“S”或漏极“D”中的另一个,图5以源极“S”为例)作为开关电路4002的第二端S2接地,开关管Q2的控制端(栅极端“G”)作为开关电路4002的开关控制端K,与比较器COMP的输出端连接。 [0084] Referring to Figure 5, a first polarity terminal of the present embodiment the switching transistor Q2 embodiment (source "S" or a drain "D" in FIG. 5 to the drain "D" as an example) as a switching a first end of the SI circuit 4002, capacitor C3 is connected to the electrical output of the second end (the end B), to the main power transistor Ql so that the drain "D" is coupled through the inductor L, the second pole of the switch Q2 of the end (the other of the source "S" or a drain "D" in FIG. 5 to the source "S" as an example) as a switching circuit 4002, a second grounding terminal S2, the switch control terminal of the transistor Q2 (the gate terminal "G") as a switching control terminal of the switching circuit 4002 K, is connected to the output terminal of the comparator COMP.

[0085] 在本实施例中,该浪涌保护电路400的工作原理是,当采样电压Vsen大于或者等于参考电压Vref时,比较器COMP输出高电平信号,主功率管Ql导通,输入能量通过输出电容C3输入至作为泄放开关的管Q2而迅速泄放至地;当采样电压Vsen小于参考电压Vref时,开关管Q2关断,输入能量通过输出电容C3流向主功率管Q1,开关电源正常工作。 [0085] In the present embodiment, the working principle of the surge protection circuit 400 is that, when the sample is greater than or equal to the reference voltage Vsen voltage Vref, the comparator COMP outputs a high level signal, a main power transistor Ql is turned on, the input energy input through a capacitor C3 to the output of the switching transistor Q2 as a bleed vent to be quickly; when the sampling voltage Vsen is less than the reference voltage Vref, the switching transistor Q2 is turned off, the energy input to the main power transistor Q1, the switching power supply through the output capacitor C3 normal work.

[0086] 由上可见,本实施例除了能取得实施例2的有益效果外,还进一步可以取得以下有益效果: [0086] seen from the above, except that the present embodiment can obtain advantageous effects of the embodiment 2, the further following beneficial effects can be obtained:

[0087] 当输入能量过大时,通过输出电容C3将输入能量迅速泄放至地,能避免高能量在输出电容C3上瞬间积聚而导致加载在主功率管Ql上的能量过大导致主功率管Ql被击穿的问题,能够避免主功率管Ql以及其他器件损坏。 [0087] When excessive input energy, the output capacitor C3 quickly bleed the energy input to ground to avoid high instantaneous energy accumulated on the capacitor C3 and the output lead loaded on main power transistor Ql can lead to excessive power main Ql tube breakdown problems can be avoided main power transistor Ql and damage to other devices. 可见,应用本实施例技术方案对主功率管Ql的保护更加有效,更能确保开关电源的主功率管Ql的安全。 Visible, the technical solution of the present embodiment is more effective for the protection of the main power transistor Ql, to better ensure the safety of the main power transistor Ql switching power supply.

[0088] 特别是,主功率级电路的输出电容C3的容值一般较大,输出电容C3对输入能量的吸收以及泄放具有较高的速度以及效率,且实际浪涌时间一般很短,再且实际电路回路本身存在一定的阻抗,故在发生输入浪涌时,应用本实施例技术方案,输入能量能被迅速泄放,输出电容C3上的电压不会被抬至过高,能有效避免加载在主功率管Ql上的电压过大,确保主功率管Ql的安全。 [0088] In particular, output capacitance of the main power stage circuit C3 is generally large, the output of the capacitor C3 and a bleed input energy absorber having a high speed and efficiency, and the actual surge time is generally very short, then an actual circuit and the impedance circuit itself must exist, so that when the input surge occurs, application of the technical solution of the present embodiment, the input energy can be quickly bleed the voltage on the output capacitor C3 is not jumping high, can effectively prevent loaded on the main power transistor Ql of the voltage is too large, to ensure the safety of main power transistor Ql.

[0089] 另外,本实施例通过主功率级电路的输出电容C3而实现输入能量泄放,无需另外引入大电容等器件,相对于现有技术,本实施例电路简单,器件较少,易于实现,特别有利于电路的小型化设计,有利于降低电路体积以及成本。 [0089] Further, the output capacitor of the present embodiment, the main power stage circuit C3 of the input energy to achieve bleed, without the introduction of additional large capacitors and other devices, with respect to the prior art, the present embodiment simple circuit, fewer components, is easy to implement compact design, the circuit is particularly advantageous, help to reduce the circuit size and cost.

[0090] 作为本实施例的示意,本实施例的开关电源还可以但不限于进一步包括有:整流桥电路401、滤波电路402。 [0090] The illustrative embodiment of the switching power supply of the present embodiment, the present embodiment may also be, without limitation, further comprising: a rectifier bridge circuit 401, filter circuit 402. 这样,外部交流输入电压VIN通过整流桥电路401转换为直流输出,直流输出经过滤波电路402后输出直流的输入电压Vg,输入电压Vg输入至主功率级电路的电压输入端G,为主功率级电路提供输入能量。 Thus, the external AC input voltage VIN 401 is converted by the DC output of the rectifier bridge circuit, the DC output after filtering circuit 402 outputs the input DC voltage Vg, the input voltage input terminal G voltage Vg is inputted to the main power stage circuit, the main power stage circuit to provide the input energy.

[0091] 如图6所示,作为本实施例的另一种可实现方式,开关电路4002还可以用一泄放电容C5和泄放开关Q2来实现,泄放电容C5与泄放开关Q2串联连接在电压输入端G和地之间。 [0091] shown in Figure 6, may be implemented as a further embodiment according to the present embodiment mode, the switching circuit 4002 may also be implemented by a capacitor C5 and a bleed bleed switch Q2, a capacitor C5 and a bleed bleed switch Q2 connected in series connected between the voltage input terminal G and ground. 即泄放电容C5的第一端作为开关电路4002的第一端SI藕接到主功率管Ql的第一极性端(藕接到电压输入端G的一端),例如可以通过电感L藕接到主功率管Ql的第一极性端,泄放电容C5的第二端连接到泄放开关Q2的第一极性端(开关管Q2的源极“S”或漏极“D”中的一个,图6以漏极“D”为例);使泄放开关的第二极性端(开关管Q2的源极“S”或漏极“D”中的另一个,图6以源极“S”为例)接地,作为开关电路4002的第二端;以开关管Q2的控制端(开关管Q2的栅极端“G”)作为开关电路4002的开关控制端K。 I.e., a first terminal of the capacitor C5 bleed switch circuit 4002 of the first coupling connected to a first terminal SI of the polar end of the main power transistor Ql (voltage input coupling to one end of G), for example, can be connected by inductive coupling L to the first polarity terminal of the main power transistor Ql bleed capacitor C5 is connected to a first terminal of a second polarity terminal bleed switch Q2 (Q2 is switch source "S" or a drain "D" of a, FIG. 6 to the drain "D" for example); the second polarity terminal bleed switch (source switch Q2 is "S" or a drain "D" of the other, the source electrode 6 of FIG. "S" for example) to ground, a second terminal of the switch circuit 4002; to the control terminal of the switching transistor Q2 (the gate terminal of the switching transistor Q2 "G") as a switching control terminal of the switching circuit 4002 K. 从而在电压输入端G的电压过高时,利用泄放开关Q2以及泄放电容C5将电压输入端G的能量泄放至地,以实现对主功率管Ql及开关电路的保护。 So that the voltage at the input terminal G of the voltage is too high, the use of bleed switch Q2 and the energy drain capacitor C5 bleed voltage at the input to ground G, in order to achieve protection of the main power transistor Ql and switching circuit.

[0092] 本实施例的进一步工作原理以及有益效果可以参见实施例1、2中的描述。 [0092] The working principle of a further embodiment according to the present embodiment and advantages of the described embodiments 1 and 2 can see Fig.

[0093] 实施例4: [0093] Example 4:

[0094] 实施例2中图4所示的浪涌保护电路400还可以适用于图7所示的开关电源。 [0094] The surge protection circuit shown in FIG embodiment 400 in Example 2 can also be applied to the switching power supply shown in Fig.

[0095] 参见图7所示,本实施例的开关电源与图4所示开关电源的主要区别主要在于主功率级电路中主开关管Q1、电感L、及整流二极管D2和输出电容C3的连接关系不同: [0095] Referring to FIG. 7, the switching power supply of the present embodiment shown in FIG. The main difference lies in the switching power supply is connected to the main power stage circuit main switch Q1, the inductor L, and the rectifying diode D2 and an output capacitor C3 4 different relationships:

[0096] 本实施例主功率级电路中的主功率管Ql的第一极性端(源极“S”或漏极“D”中的一个,图7以漏极“D”为例)与电压输入端G连接,主功率管Ql的第二极性端(源极“S”或漏极“D”中的另一个,图7以源极“S”为例)通过电感L以及输出电容C3耦接到地,电感L与主功率管Ql的连接节点C通过整流二极管D2耦接到地。 [0096] This first polarity end of the main power transistor Ql embodiment main power stage circuit in embodiment (a source "S" or a drain "D" in Figure 7 to the drain "D" for example) and voltage input terminal G is connected to the second end of the main power transistor Ql polarity (the other of the source "S" or a drain "D" in Figure 7 to the source "S", for example) and an output capacitor through the inductor L C3 is coupled to ground, the inductance L of the main power transistor Ql is connected to the node C through the rectifier diode D2 is coupled.

[0097] 在图7所示电路中,开关电路4002可以由一泄放开关来实现,譬如采用开关管Q2作为该泄放开关。 [0097] In the circuit shown in FIG. 7, the switching circuit 4002 may be implemented by a bleed switch, such as the use of switching transistor Q2 bleed switch.

[0098] 参见图7所示,使开关管Q2的第一极性端(源极“S”或漏极“D”中的一个,图7以漏极“D”为例)作为开关电路4002的第一端SI,耦接到电压输入端G ;以开关管Q2的第二极性端(源极“S”或漏极“D”中的另一个,图7以源极“S”为例)作为开关电路4002的第二端S2,通过输出电容C3耦接到地,开关管Q2的栅极端“G”作为开关电路7003的开关控制端K即可。 [0098] Referring to FIG. 7, the polarity of the first terminal of the switch transistor Q2 (the source "S" or a drain "D" in Figure 7 to the drain "D" as an example) as a switching circuit 4002 a first end of the SI, is coupled to the input terminal G voltage; a second polarity to the other terminal of the switch transistor Q2 (the source "S" or a drain "D" in Figure 7 to the source "S" of Example) as a switching circuit 4002, a second end of S2, the output capacitor C3 is coupled to ground, the gate terminal of the switch Q2 is "G" as the switching circuit 7003 to control the switch terminal K.

[0099] 由于开关管Q2与输出电容串联藕接在电压输入端G与地之间,因此当电压输入端G的输入电压大于或等于阈值电压时,开关管Q2导通,输入至电压输入端G的输入能量通过开关管Q2和输出电容C3泄放至地,以避免主功率管Ql上的能量过大,以对其进行保护;当电压输入端G的输入电压小于设定的阈值电压时,开关管Q2关断,电压输入端G的能量正常流向主功率管Q1,使开关电源正常工作。 [0099] Since the switching transistor Q2 and an output capacitor in series coupling is connected between the voltage input terminal G and ground, so that when the input voltage input terminal G is greater than or equal to the threshold voltage, the switching transistor Q2 is turned on, the input to the voltage input terminal G input energy bleed through the switch transistor Q2 to ground and an output capacitor C3, in order to avoid too much energy on the main power transistor Ql, to protect it; threshold voltage of the input voltage when the input voltage is less than the set when G , the switch Q2 is turned off, the energy input terminal G of the normal voltage flows to the main power transistor Q1, the switching power supply is working properly.

[0100] 如图8所示,作为本实施例的另一个可实现方式,开关电路4002还可以用一泄放电容C5和泄放开关Q2来实现,泄放电容C5与泄放开关Q2串联连接在电压输入端G和地之间。 [0100] As shown in FIG. 8, as another embodiment of the present embodiment may be implemented embodiment, the switching circuit 4002 may also be achieved by a bleed and drain capacitor C5 switch Q2, a capacitor C5 and a bleed bleed switch Q2 are connected G between the voltage input terminal and ground. 即以泄放电容C5的第一端作为开关电路4002的第一端SI,连接到电压输入端G,使泄放电容C5的第二端连接到泄放开关Q2的第一极性端(开关管Q2的源极“S”或漏极“D”中的一个,图8以漏极“D”为例);以泄放开关的第二极性端(开关管Q2的源极“S”或漏极“D”中的另一个,图8以源极“S”为例)作为开关电路4002的第二端S2,连接到地,以泄放开关的控制端(开关管Q2的栅极端“G”)作为开关电路4002的开关控制端K。 I.e., to a first terminal of the capacitor C5 bleed switch circuit 4002 first terminal SI, connected to the voltage input terminal G, so that a second end of the drain capacitor C5 is connected to a first end of the bleed polarity switch Q2 (switch Q2 is a source electrode tube "S" or a drain "D" in FIG. 8 to the drain "D" for example); a second polarity terminal bleed switch (the source of the switch Q2 pole "S" another or the drain "D" in FIG. 8 to the source "S", for example) as the second terminal of the switching circuit S2 4002, is connected to ground, the gate terminal of the bleed to the control terminal of the switch (switching transistor Q2 "G") as a switching control terminal of the switch circuit 4002 K. 从而在电压输入端G的电压过高时,利用泄放开关Q2与泄放电容C5将电压输入端G的能量泄放至地,以实现对主功率管Ql及开关电路的保护。 G so that the voltage at the input voltage is too high, the use of bleed switch Q2 and the energy drain capacitor C5 to the voltage input terminal G to be bleed to achieve protection of the main power transistor Ql and switching circuit.

[0101] 本实施例的进一步工作原理以及有益效果可以参见实施例1、2中的描述。 [0101] Further the working principle of the present embodiment and advantages of the embodiment may be described in Examples 1 and 2 see Fig.

[0102] 以上所述的实施方式,并不构成对该技术方案保护范围的限定。 Embodiment [0102] above, do not limit the scope of protection of the technical solution. 任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等,均应包含在该技术方案的保护范围之内。 Any modifications within the spirit and principle of the above embodiments, equivalent alterations and modifications all fall within the scope of protection of the technical solution.

Claims (10)

1.一种适用于开关电源的浪涌保护方法,其特征是,所述开关电源具有主功率级电路,所述主功率级电路中设置有主功率管,所述方法包括: 当所述主功率级电路的输入电压大于或等于阈值电压时,使输入至所述主功率级电路的输入能量不流向所述主功率管; 当所述输入电压小于所述阈值电压时,使所述输入能量流向所述主功率管。 A suitable switching power surge protection, characterized in that the switching power supply circuit with a main power stage, the main circuit of the power stage is provided with a main power transistor, the method comprising: when the main when the input voltage of the power stage circuit voltage is greater than or equal to the threshold, the power input to the primary energy input stage circuit does not flow to the main power transistor; when the input voltage is less than the threshold voltage, the input energy the main power flow tube.
2.根据权利要求1所述的适用于开关电源的浪涌保护方法,其特征是, 所述主功率级电路包括输出电容, 当所述输入电压大于或等于所述阈值电压时,让所述输入能量经过所述输出电容被泄放,使所述输入能量不流向所述主功率管。 2. Surge protection method applied to a switching power supply according to claim 1, characterized in that said main circuit includes an output capacitance of the power stage, when the input voltage is greater than or equal to the threshold voltage, so that the input energy is vented through the output capacitor, the input energy is not flowing to the main power transistor.
3.一种适用于开关电源的浪涌保护电路,所述开关电源包括主功率级电路,所述主功率级电路包括耦接在所述主功率级电路的电压输入端与地之间的主功率管,其特征是, 所述保护电路包括输入电压检测电路、以及开关电路, 所述输入电压检测电路用于检测所述电压输入端的输入电压与一阈值电压的大小关系,并输出检测结果, 所述开关电路的第一端耦接到所述主功率管的第一极性端,第二端耦接到地,开关控制端与所述输入电压检测电路的输出端连接,其中,所述主功率管的第一极性端耦接到所述电压输入端, 当所述输入电压大于或等于所述阈值电压时,所述开关电路导通,使输入至所述主功率级电路的输入能量经过所述开关电路泄放至地, 当所述输入电压小于所述阈值电压时,所述开关电路断开,所述输入能量流向所述主功率管。 A surge protection circuit suitable for switching power supplies, the switching power supply includes a main power stage circuit, said primary circuit comprises a power stage coupled between the voltage input terminal of the main power stage of the main circuit and ground power tube, characterized in that the protective circuit includes an input voltage detecting circuit, and a switching circuit, the input voltage detection circuit for detecting the magnitude relationship between the input voltage and the voltage input terminal of a threshold voltage, and outputs a detection result, the first terminal of the switching circuit connected to the first polarity end of said main power transistor, a second terminal coupled to ground, and the switching control terminal of the input voltage detection circuit connected to the output terminal, wherein said a first polarity terminal of the main power transistor coupled to the voltage input terminal, when the input voltage is greater than or equal to the threshold voltage, the switching circuit is turned on, the main power input to the input stage circuit energy to bleed through the switching circuit, when the input voltage is less than the threshold voltage, the switching circuit is turned off, the energy input of the main power flow tube.
4.根据权利要求3所述的适用于开关电源的浪涌保护电路,其特征是, 所述主功率级电路包括输出电容,所述输出电容的第一端耦接到所述电压输入端,第二端耦接到所述主功率管的第一极性端, 所述开关电路的第一端通过所述主功率级电路的输出电容耦接到所述电压输入端, 当所述输入电压大于或等于所述阈值电压时,所述输入能量经过所述输出电容和所述开关电路泄放至地, 当所述输入电压小于所述阈值电压时,所述输入能量通过所述输出电容流向所述主功率管。 4. The surge protection circuit suitable for switching power supplies according to claim 3, characterized in that said main circuit includes an output capacitance of the power stage, the output terminal of the first capacitor is coupled to said voltage input terminal, a second end coupled to the first polarity end of said main power transistor, a first terminal of the switch circuit through the main circuit of the power stage output capacitor coupled to the input voltage when the input voltage greater than or equal to the threshold voltage, the input energy through the output capacitor and the switching circuit to bleed, when the input voltage is less than the threshold voltage, the input energy flow through the output capacitor the main power transistor.
5.根据权利要求4所述的适用于开关电源的浪涌保护电路,其特征是, 所述开关电路为一泄放开关, 所述泄放开关的第一极性端为所述开关电路的第一端,第二极性端为所述开关电路的第二端,控制端为所述开关电路的开关控制端。 The surge protection circuit suitable for switching power supplies according to claim 4, wherein the switching circuit switches to a bleeder, vent the first terminal of the switch to the polarity switching circuit a first end, a second end of said polarity switching circuit second terminal, the control terminal of the switch to the control terminal of the switching circuit.
6.根据权利要求3所述的适用于开关电源的浪涌保护电路,其特征是, 所述开关电路包括一泄放开关、以及一泄放电容, 所述泄放电容的第一端为所述开关电路的第一端,第二端与所述泄放开关的第一极性端相连, 所述泄放开关的第二极性端为所述开关电路的第二端,控制端为所述开关电路的开关控制端。 Applicable according to claim 3, wherein the surge protection circuit of a switching power supply, wherein the switching circuit comprises a bleed switch, and a drain capacitor, the first terminal of the capacitor to bleed the a first terminal of said switch circuit, a first end and a second end of said polarity switches connected to bleed, bleed the second polarity terminal of the switch to a second terminal of said switching circuit, control terminal of the said switching control terminal of the switch circuit.
7.根据权利要求3-6中任意一所述的适用于开关电源的浪涌保护电路,其特征是, 所述输入电压检测电路包括: 输入电压米样电路,用于获取所述输入电压的米样信号; 比较电路,用于比较所述采样信号与表征所述阈值电压的参考信号,并向所述开关电路的开关控制端输出比较信号作为所述检测结果。 The surge protection circuit is adapted for switching power supply according to any one of claims 3-6, characterized in that, the input voltage detection circuit comprising: a voltage input m sampling circuit, for obtaining the input voltage m sampled signal; comparing circuit for comparing the sampled signal with a reference signal characterizing the threshold voltage, switch to the control terminal of the switching circuit outputs the comparison signal as the detection result.
8.一种开关电源,其特征是,所述开关电源包括: 主功率级电路,包括耦接在主功率级电路的电压输入端与地之间的主功率管; 还包括权利要求3-7中任意一所述的浪涌保护电路,所述浪涌保护电路与所述主功率级电路相连。 8. A switching power supply, wherein said switching power supply comprising: a main power stage circuit comprising coupled between ground and the voltage input terminal of the main power stage of the main power transistor circuit; claims 3-7 further comprising any one of the surge protection circuit, a surge protection circuit and the main power stage circuit.
9.根据权利要求8所述的开关电源,其特征是, 所述主功率级电路包括输出电容, 所述输出电容的第一端耦接到所述电压输入端,第二端耦接到所述主功率管的第一极性端。 9. The switching power supply according to claim 8, characterized in that said main circuit includes an output capacitance of the power stage, the output terminal of the first capacitor is coupled to said voltage input terminal, a second terminal coupled to the a first end of said main power transistor polarity.
10.根据权利要求9所述的开关电源,其特征是, 所述主功率级电路包括一电感、以及一整流二极管, 所述电感的连接在所述输出电容的第二端和所述主功率管的第一极性端之间, 所述整流二极管的阴极与所述电压输入端连接,阳极与所述主功率管的第一极性端连接。 10. The switching power source as claimed in claim 9, wherein said main power stage circuit includes an inductor, and a rectifier diode, the inductance connected between the output terminal of the second capacitor and the main power polarity between the first end of the tube, the cathode of the rectifier diode connected to the voltage input terminal, an anode terminal of the first polarity of said main power transistor is connected.
CN201410558379.8A 2014-10-20 2014-10-20 Switching power supply and surge protection circuit and method adaptive to same CN104362842A (en)

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