阅读说明：本技术 高压供电方法、电路、芯片及系统 (High-voltage power supply method, circuit, chip and system ) 是由 丁士轩 胡渊 于 2019-11-20 设计创作，主要内容包括：本发明提供的高压供电方法,高压转换模块接收输入的高压电压,输出低压电压,将所述低压电压传输给自启动分压电路和多路噪声隔离输出电路；自启动分压电路接收所述低压电压,输出反馈电压给电压调节电路,并输出控制电压；电压调节电路接收基准电压和所述反馈电压,并输出电压对所述控制电压进行补偿,使得控制电压趋于稳定；多路噪声隔离输出电路接收所述低压电压与所述控制电压,输出多路噪声隔离的供电电压,为外部开关管供电。该方法提高了可靠性和可拓展性。(The high-voltage power supply method provided by the invention comprises the steps that a high-voltage conversion module receives input high-voltage, outputs low-voltage, and transmits the low-voltage to a self-starting voltage division circuit and a multi-path noise isolation output circuit; the self-starting voltage division circuit receives the low-voltage, outputs feedback voltage to the voltage regulation circuit and outputs control voltage; the voltage regulating circuit receives the reference voltage and the feedback voltage and outputs voltage to compensate the control voltage, so that the control voltage tends to be stable; and the multi-path noise isolation output circuit receives the low-voltage and the control voltage, outputs the multi-path noise isolation power supply voltage and supplies power for the external switching tube. The method improves reliability and expansibility.)

1. A high voltage power supply method, comprising the steps of:

the high-voltage conversion module receives input high-voltage, outputs low-voltage and transmits the low-voltage to the self-starting voltage division circuit and the multi-path noise isolation output circuit;

the self-starting voltage division circuit receives the low-voltage, outputs feedback voltage to the voltage regulation circuit and outputs control voltage;

the voltage regulating circuit receives the reference voltage and the feedback voltage and outputs voltage to compensate the control voltage, so that the control voltage tends to be stable;

and the multi-path noise isolation output circuit receives the low-voltage and the control voltage, outputs the multi-path noise isolation power supply voltage and supplies power for the external switching tube.

2. A high-voltage power supply circuit is characterized by comprising a high-voltage conversion module, a self-starting voltage division circuit, a voltage regulation circuit and a multi-path noise isolation output circuit;

the input end of the high-voltage conversion module is connected with high-voltage, the output end of the high-voltage conversion module is connected with the input end of the self-starting voltage division circuit and the multi-path noise isolation output circuit, the output end of the self-starting voltage division circuit is connected with the input end of the voltage regulation circuit, the output end of the voltage regulation circuit compensates the output end of the self-starting voltage division circuit, the output end of the voltage regulation circuit is connected with the multi-path noise isolation output circuit, and the multi-path noise isolation output circuit outputs power supply voltage to supply power for an external switching tube.

3. The high voltage supply circuit of claim 2,

the high-voltage conversion module comprises a junction field effect transistor JT1, the grid electrode of the junction field effect transistor JT1 is grounded, the drain electrode of the junction field effect transistor JT1 is connected with high-voltage, and the source electrode of the junction field effect transistor JT1 is used as the output end of the high-voltage conversion module to output low-voltage.

4. The high voltage supply circuit of claim 2,

the self-starting voltage division circuit comprises a resistor R1, a resistor R2 and a resistor R3;

the output end of the high-voltage conversion module is grounded through serially connecting the resistor R1, the resistor R2 and the resistor R3, and the middle node of the resistor R1 and the resistor R2 is used as the first output end of the high-voltage conversion module to output control voltage; and the middle node of the resistor R2 and the resistor R3 is used as a second output end of the high-voltage conversion module and outputs a feedback voltage.

5. The high voltage supply circuit of claim 4,

the voltage regulation circuit comprises an operational amplifier EA, a reference voltage source Vr1, a field-effect tube M1 and a field-effect tube M2; the reference voltage source Vr1 is used for outputting a reference voltage;

the second output end of the high-voltage conversion module is connected with the forward input end of the operational amplifier EA, the output end of the reference voltage source Vr1 is connected with the reverse input end of the operational amplifier EA, the output end of the operational amplifier EA is connected with the grid electrode of the field-effect tube M2, the source electrode of the field-effect tube M2 is grounded, the drain electrode of the field-effect tube M2 is connected with the drain electrode of the field-effect tube M1, the source electrode of the field-effect tube M1 is connected with the first output end of the high-voltage conversion module, and the source electrode of the field-effect.

6. The high voltage supply circuit of claim 4,

the multipath noise isolation output circuit comprises a field effect transistor Q1 and a field effect transistor Q2;

the first output end of the high-voltage conversion module is connected with the grid of a field-effect tube Q1, the grid of a field-effect tube Q1 is connected with the grid of a field-effect tube Q2, the drain of the field-effect tube Q1 and the drain of the field-effect tube Q2 are respectively connected to the output end of the high-voltage conversion module, and the source of the field-effect tube Q1 and the source of the field-effect tube Q2 are respectively used as different output ends of the multi-path noise isolation output circuit to output different power supply voltages.

7. A high-voltage power supply chip is characterized in that,

the high-voltage power supply circuit comprises the high-voltage power supply circuit as claimed in any one of claims 1 to 6.

8. A high-voltage power supply system is characterized in that,

the high-voltage power supply circuit comprises the high-voltage power supply circuit as claimed in any one of claims 1 to 6.

Technical Field

The invention belongs to the technical field of new energy chip control, and particularly relates to a high-voltage power supply method, circuit, chip and system.

Background

Currently, LED lighting is used as a new technology, and compared with a traditional lighting source, the LED lighting source has the advantages of energy conservation, environmental protection and the like. Especially in recent years, our country advocates more and more energy-saving and environmental protection concepts, and the LED lighting application is more and more extensive. For the control chip of LED illumination, it is more convenient for practical application to get electricity from 220V high voltage of commercial power, therefore use the high voltage power supply circuit as commercial power and LED control circuit direct access circuit, save more peripheral device cost.

As shown in fig. 1, the conventional high-voltage power supply circuit includes a switching transistor VT1, an operational amplifier EA1, a junction field effect transistor JT1, a voltage-dividing resistor string composed of resistors R1 and R2, and a reference voltage source Vr 1. The drain D of JT1 is connected to the high voltage VM of the power supply, and the gate G of JT1 is grounded. The source terminal S of JT1 is used to generate pinch-off voltage VJ. The positive input end of the operational amplifier EA1 is connected with a reference voltage Vref generated by a reference voltage source Vr1, the negative input end is connected with a divided voltage Vfb obtained by sampling Vcc by a resistor R1 and R2, and an output signal Veao of EA1 controls a switching tube VT1 to output fixed Vcc.

The high-voltage power supply circuit has the following defects: firstly, the voltage in the operational amplifier EA1 is higher than Vcc, and the operational amplifier EA1 needs to use a high-voltage tube to take power from a VJ end. Secondly, in a starting stage, Vcc is 0, the reference voltage source Vr1 can not work normally, and the stability and reliability of the circuit can not be ensured before the power-on process reaches the normal work of the reference voltage source Vr 1. And thirdly, the power supply voltage Vcc can only provide single load capacity, and if a plurality of VT switching tubes are connected, noises among different Vcc can interfere with each other through the feedback voltage Vfb.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a high-voltage power supply method, a circuit, a chip and a system, and improves the reliability and the expansibility.

In a first aspect, a high voltage power supply method includes the steps of:

the high-voltage conversion module receives input high-voltage, outputs low-voltage and transmits the low-voltage to the self-starting voltage division circuit and the multi-path noise isolation output circuit;

the self-starting voltage division circuit receives the low-voltage, outputs feedback voltage to the voltage regulation circuit and outputs control voltage;

the voltage regulating circuit receives the reference voltage and the feedback voltage and outputs voltage to compensate the control voltage, so that the control voltage tends to be stable;

and the multi-path noise isolation output circuit receives the low-voltage and the control voltage, outputs the multi-path noise isolation power supply voltage and supplies power for the external switching tube.

In a second aspect, a high voltage power supply circuit comprises a high voltage conversion module, a self-starting voltage division circuit, a voltage regulation circuit and a multi-path noise isolation output circuit;

the input end of the high-voltage conversion module is connected with high-voltage, the output end of the high-voltage conversion module is connected with the input end of the self-starting voltage division circuit and the multi-path noise isolation output circuit, the output end of the self-starting voltage division circuit is connected with the input end of the voltage regulation circuit, the output end of the voltage regulation circuit compensates the output end of the self-starting voltage division circuit, the output end of the voltage regulation circuit is connected with the multi-path noise isolation output circuit, and the multi-path noise isolation output circuit outputs power supply voltage to supply power for an external switching tube.

Preferably, the high voltage conversion module includes a junction field effect transistor JT1, a gate of the junction field effect transistor JT1 is grounded, a drain of the junction field effect transistor JT1 is connected to the high voltage, and a source of the junction field effect transistor JT1 is used as an output terminal of the high voltage conversion module to output the low voltage.

Preferably, the self-starting voltage division circuit comprises a resistor R1, a resistor R2 and a resistor R3;

the output end of the high-voltage conversion module is grounded through serially connecting the resistor R1, the resistor R2 and the resistor R3, and the middle node of the resistor R1 and the resistor R2 is used as the first output end of the high-voltage conversion module to output control voltage; and the middle node of the resistor R2 and the resistor R3 is used as a second output end of the high-voltage conversion module and outputs a feedback voltage.

Preferably, the voltage regulation circuit comprises an operational amplifier EA, a reference voltage source Vr1, a field effect transistor M1 and a field effect transistor M2; the reference voltage source Vr1 is used for outputting a reference voltage;

the second output end of the high-voltage conversion module is connected with the forward input end of the operational amplifier EA, the output end of the reference voltage source Vr1 is connected with the reverse input end of the operational amplifier EA, the output end of the operational amplifier EA is connected with the grid electrode of the field-effect tube M2, the source electrode of the field-effect tube M2 is grounded, the drain electrode of the field-effect tube M2 is connected with the drain electrode of the field-effect tube M1, the source electrode of the field-effect tube M1 is connected with the first output end of the high-voltage conversion module, and the source electrode of the field-effect.

Preferably, the multipath noise isolation output circuit comprises a field effect transistor Q1 and a field effect transistor Q2;

the first output end of the high-voltage conversion module is connected with the grid of a field-effect tube Q1, the grid of a field-effect tube Q1 is connected with the grid of a field-effect tube Q2, the drain of the field-effect tube Q1 and the drain of the field-effect tube Q2 are respectively connected to the output end of the high-voltage conversion module, and the source of the field-effect tube Q1 and the source of the field-effect tube Q2 are respectively used as different output ends of the multi-path noise isolation output circuit to output different power supply voltages.

In a third aspect, a high voltage power supply chip,

comprising the high voltage supply circuit according to the second aspect.

In a fourth aspect, a high voltage power supply system,

comprising the high voltage supply circuit according to the second aspect.

According to the technical scheme, the high-voltage power supply method, the circuit, the chip and the system improve reliability and expansibility.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a circuit diagram of a conventional high-voltage power supply circuit provided in the background art.

Fig. 2 is a flowchart of a high-voltage power supply method according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of a high-voltage power supply circuit according to a second embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".