Starting circuit

A technology for starting circuits and driving circuits, which is applied to electrical components, high-efficiency power electronic conversion, and output power conversion devices, etc., can solve the problem that the boost circuit or the post-stage control circuit cannot be started, and limit the starting voltage of the second-stage boost circuit. , Unable to meet the starting voltage range and other problems, to achieve the effect of meeting the input voltage range, reducing loss, and low loss

Inactive Publication Date: 2018-06-15
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large voltage difference between the voltage clamping circuit Vin and Vo, the starting voltage of the second stage boost circuit is limited.
Traditional voltage clamping circuit schemes such as figure 2 As shown (the load is the post-stage boost circuit), the working principle of the circuit is: the moment the product is powered on, the transistor Q1 is turned on, and the emitter current of the transistor Q1 rapidly charges the capacitor C2. When the voltage of the capacitor C2 (that is, the output of the starting circuit is positive) When the voltage provided by the terminal to the power supply terminal Vcc of the control IC) climbs to the regulated value of the Zener diode D1 minus the conduction voltage drop between the base and emitter of the transistor Q1, the Vcc voltage will stabilize and no longer increase. When the Vcc voltage reaches When the voltage of the booster circuit is working, the booster circuit starts to work to establish the power supply voltage of the subsequent control circuit or co

Method used

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Example

[0036] first embodiment

[0037] A startup circuit of the present invention includes a P-MOS transistor TR1, an adjustable driving circuit and a voltage limiting circuit. Figure 5 The following specific circuits are used to describe the above three features in detail as follows:

[0038] The adjustable drive circuit of the present invention includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first NPN transistor Q3, and a first PNP transistor Q2. The third resistor R3 is connected between the input voltage Vin and the collector of the first NPN transistor Q3; the fifth resistor R5 is connected between the input voltage Vin and the sixth resistor R6; the other end of the sixth resistor R6 is grounded; The emitter of an NPN transistor Q3 is connected to one end of the fourth resistor R4, the base is connected to the connection point of the fifth resistor R5 and the sixth resistor R6; the ot...

Example

[0048] Second Embodiment

[0049] On the basis of the first embodiment, the second embodiment of the present invention can be obtained by modifying the voltage limiting circuit. Figure 5 The specific circuit of the second embodiment specifically describes the above three features as follows:

[0050] The adjustable drive circuit and the PNP transistor circuit of the present invention are consistent with the first embodiment.

[0051] The difference from the first embodiment is that the voltage limiting circuit of the present invention is a voltage regulator circuit, including a second chip IC2. The second chip IC2 can be any chip that has the function of stabilizing the input voltage to a fixed voltage value and outputting it. The input terminal of the second chip IC2 is connected to the input voltage Vin, the ground terminal of the second chip IC2 is grounded, and the output terminal of the second chip IC2 is connected to the drain of the P-MOS transistor TR1 as the output...

Example

[0055] Third Embodiment

[0056] On the basis of the first embodiment and the second embodiment, the third embodiment of the present invention can be obtained by improving the voltage limiting circuit. The following appendix Image 6 The voltage limiting circuit of the third embodiment is described as follows:

[0057] The voltage limiting circuit in this embodiment is also a voltage regulator circuit, including a seventh resistor R7, an eighth resistor R8, a second NPN transistor Q4, a first capacitor C1 and a first diode Z1, the first diode Z1 can be used 10V Zener tube. One end of the seventh resistor R7 is connected to the collector of the second NPN transistor Q4, and the other end is connected to Vin; one end of the eighth resistor R8 is connected to Vin, and the other end is connected to the base of the second NPN transistor Q4; One end is connected to the base of the second NPN transistor Q4, and the other end is connected to the input ground; the cathode of the firs...

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Abstract

The invention provides a starting circuit. A voltage limiting circuit composed of a P-MOS tube circuit, a voltage stabilizing circuit or a voltage clamp circuit is used to control the range of outputvoltage, it is ensured that the output voltage is within the working voltage range of a post boost circuit of the starting circuit of a post power supply module with a super wide input voltage range.An adjustable driving circuit samples an input voltage, and it is ensured that the starting circuit does not influence post power supply due to voltage difference of the starting circuit itself duringlow-voltage work; and during high-voltage work, the output voltage is controlled within the voltage range, and it is ensured that the output voltage of the starting circuit in a working voltage interval satisfies the working voltage range of the post boost circuit. Loss of the circuit in the working state is extremely low.

Description

technical field [0001] The invention relates to a starting circuit of a switching power supply, in particular to a starting circuit in a switching power supply for supplying power to a control circuit or a control IC of a power stage circuit, or to supplying power to a step-up circuit after the starting circuit. Background technique [0002] Start-up circuits are widely used in the field of switching power supplies. In switching power supply products, no matter the primary power supply (AC-DC converter) or the secondary power supply (DC-DC converter), it is necessary to obtain energy from the input terminal and provide a stable power supply voltage for the subsequent control circuit or control IC. Power supply, so as to drive the switch on and off by controlling the operation of the circuit, and control the inductive device to transfer energy periodically. [0003] In general switching power supplies, in order to solve the problem that when the input voltage is lower than t...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCH02M1/36H02M1/0048H02M1/08H02M3/156H02M3/33507H02M3/33561H02M1/0006Y02B70/10
Inventor 李树佳冯刚郑典清
Owner MORNSUN GUANGZHOU SCI & TECH
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