TWI659612B - Optical-control driving circuit for high voltage utility power - Google Patents

Abstract

The invention discloses a mains high-voltage light-controlled driving circuit, which is used for high-voltage high-current and mains surge conditions in the mains. The mains high-voltage light-controlled driving circuit includes a light-controlled switch circuit and a silicon-controlled rectifier. Circuit and a main circuit. The light-controlled switch circuit includes a light-controlled brake fluid assembly and a first switching element connected in series; the silicon-controlled rectifier light-control drive circuit is provided with at least two controlled silicon-controlled rectifier switching elements connected in series and connected to a plurality of The diode is coupled to the main circuit. The invention provides a light-controlled driving circuit which can effectively achieve the ability to adjust the driving current according to the voltage of the mains. At the same time, it can realize the topology structure resistant to the high-voltage impact of the mains to improve the overall efficiency of the circuit; especially it can be applied to high-power A DC converter using a silicon controlled rectifier (SCR) as a switching device to improve its working efficiency under light load.

Description

Mains high-voltage light-controlled drive circuit

The invention relates to a high-voltage power-controlled driving circuit of a city power supply, in particular to a field of a light-control driving circuit applied to a high-voltage and large-current current in a general power supply of a city and a serious condition of a power surge.

In the power electronics field, SCR (Silicon-Controlled Rectifier) is often used to control the mains switch. However, the control signal has a problem with the power silicon-controlled rectifier (SCR), which causes the silicon-controlled rectifier (SCR) to drive. The circuit needs to be isolated. At present, the isolation scheme adopted by the general industry generally adopts two strategies of transformer isolation and light control isolation. However, the traditional transformer-isolated driving circuit has the disadvantages of high driving loss and poor pulse driving, especially the pulse driving will cause the impedance characteristics between the cathode / anode (AK) of the silicon controlled rectifier (SCR) to appear. Pulse changes. In this way, in the case of high-current operation of the mains, the loss of the silicon controlled rectifier (SCR) body will increase significantly due to the change in impedance, which will reduce the implementation efficiency of the device.

Based on the equipment's requirements for higher efficiency, light-control isolated drive methods have been proposed and widely used. However, power devices are limited by high power density and packaging. Common light-control brake fluid components can withstand a maximum voltage of 800V. Therefore, the high-pressure impact resistance and surge impact of light-controlled brake fluids have been bottlenecks in design. Therefore, it is necessary to propose a circuit topology structure that can adjust the driving current capability according to the mains voltage, and at the same time can realize the high-voltage and surge shock resistance of the mains to improve the overall efficiency of the circuit.

The technical problem to be solved by the present invention is that, for the silicon controlled rectifier (SCR) transformer isolation driving circuit existing in the above existing topology circuit structure, the loss of the silicon controlled rectifier (SCR) body caused by the discontinuous driving current is too large, etc. The shortcomings provide a silicon-controlled rectifier (SCR) light-control isolated driving circuit with high efficiency and fast dynamic response, which is further suitable for high-voltage and large-current of mains power.

The mains high-voltage light-controlled driving circuit of the present invention is used for high-voltage high-current and mains surge conditions of the mains. The mains high-voltage light-controlled driving circuit includes: a light-controlled switching circuit including a light-controlled switch circuit; A brake fluid component and a first switching element Q1, the light-controlled switching circuit and a driving switch signal are input; the light-controlled brake fluid component is connected in series with the first switching element Q1, and the light-controlled brake fluid component has at least four A silicon-controlled rectifier light-controlled driving circuit, which receives a mains power input and is coupled to the light-controlled switching circuit. The silicon-controlled rectifier light-controlled driving circuit includes: a second controlled silicon-controlled rectifier switching element Q2; A third controlled silicon controlled rectifier switching element Q3, a cathode terminal of the third controlled silicon controlled rectifier switching element Q3 is coupled to an anode terminal of the second controlled silicon controlled rectifier switching element Q2 and coupled to the mains power supply A first diode D1, the cathode terminal of the first diode D1 is coupled to the gate terminal of the second controlled silicon controlled rectifier switching element Q2, and the anode terminal of the first diode D1 is coupled to The light control gate The third end of the body assembly; a second diode D2, the cathode of the second diode D2 is coupled to the gate terminal of the third controlled silicon controlled rectifier switching element Q3, and the second diode D2 Is connected to the anode terminal of the first diode D1; a third diode D3, and the anode terminal of the third diode D3 is coupled to the second controlled silicon controlled rectifier switching element Q2 An anode terminal, a cathode terminal of the third diode D3 is coupled to the fourth terminal of the photo-control gate fluid component; and a fourth diode D4, the anode terminal of the fourth diode D4 is coupled to the The anode terminal of the third controlled silicon controlled rectifier switching element Q3, the cathode terminal of the fourth diode D4 is coupled to the cathode terminal of the third diode D3, and a main circuit coupled to the silicon controlled rectifier A light-controlled driving circuit. The main circuit is provided with an A terminal, a B terminal, and a mains ground terminal. The A terminal of the main circuit is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2. B The terminal is coupled to the anode terminal of the third controlled silicon controlled rectifier switching element Q3.

10‧‧‧light control switch circuit

12‧‧‧Light-control brake fluid assembly

20‧‧‧ Silicon-controlled rectifier light-controlled driving circuit

30‧‧‧Main circuit

31‧‧‧The first DC-DC converter

32‧‧‧Second DC-DC Converter

U1‧‧‧The first light control brake fluid

U2‧‧‧Second light control brake fluid

Q1‧‧‧The first switching element

Q2‧‧‧Second controlled silicon controlled rectifier switching element

Q3‧‧‧third controlled silicon controlled rectifier switching element

Q4‧‧‧Fourth switching element

Q5‧‧‧ fifth switching element

SCRIO‧‧‧Drive switch signal

VCC‧‧‧DC Power Supply

GNDS‧‧‧ DC power ground

D1 ~ D6‧‧‧‧First ~ Sixth Diode

R1 ~ R2‧‧‧ First and second resistors

R3 ~ R4‧‧‧The third and fourth voltage equalizing resistors

R5 ~ R8‧‧‧Fifth ~ eighth resistor

C1 ~ C7‧‧‧‧First ~ Seventh capacitor

ZD1‧‧‧Regulator

L1 ~ L2‧‧‧first ~ second inductor

A‧‧‧A

B‧‧‧B side

FIG. 1 is a schematic diagram of circuit module connection according to an embodiment of the present invention; FIG. 2 is a schematic diagram of connection of various circuit elements in the embodiment of the present invention; FIG. 3 is a schematic diagram of a positive half-cycle embodiment of the present invention; Schematic of negative half-week embodiment.

In the following, reference is made to the accompanying drawings to describe the various exemplary embodiments more fully, and to show some exemplary embodiments in the accompanying drawings. However, the concept of the invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the corresponding positions of circuit blocks and circuit elements and various devices may be exaggerated for the sake of clarity, and for similar English labels or numbers, similar elements are always indicated.

It should be understood that although the term switching element may be used in this document to include a switching element, which refers to an expression term for a switching element, it is not limited to the use of IGBT, BJT, MOS, CMOS, JFET, or MOSFET, that is, these elements It should not be limited by the actual product terminology of these electronic components. And the first, second, third ... appearing herein; or the first switching element Q1, the fourth switching element Q4; or the first capacitor C1, the second capacitor C2; or the first diode D1 , The second diode D2; ..., these terms are used to clearly distinguish one element from another element, and do not have a certain order of element relationship, that is, there may be a first switching element, a fourth The implementation of the switching element without the second switching element does not necessarily have a continuous serial number as the labeling relationship of the element symbol.

As used herein, the terms first, second, upper or lower, left or right, left or right, primary or secondary, etc. are used To clearly distinguish one end of an element from the other end of the element, or to distinguish between one element and another, or between one endpoint and the other, it is not intended to limit The sequence or positional relationship presented by the text serial number does not necessarily have a numerically continuous relationship. Also, the term "and / or" may be used to include all combinations of any one and one or more of the associated listed items. Furthermore, the term "plurality" or "at least two" may be used herein to describe having multiple elements, but such plural elements or at least two elements are not limited to two, three, or four implementations. And the number of components above four indicates the technology implemented.

The invention discloses a mains high voltage light-controlled driving circuit, which is used under the working conditions of high voltage and high current of mains and mains surge, and provides a high efficiency and fast dynamic response, which is further suitable for high voltage and high current of mains power. A kind of content about the circuit component composition and connection relationship of silicon-controlled rectifier (SCR) optically-controlled isolated driving circuit, which effectively improves the prior art silicon-controlled rectifier (SCR) transformer isolated driving circuit caused by large loss and discontinuous driving current. The defect of the silicon controlled rectifier (SCR) body is too large.

FIG. 1 discloses that the mains high-voltage light-controlled driving circuit of the present invention includes a light-controlled switching circuit 10, a silicon-controlled rectifier light-controlled driving circuit 20, and a main circuit 30. The main circuit 30 is also referred to as a converter. The light control switch circuit 10 receives a driving switch signal SCRIO, and the driving switch signal SCRIO performs a switching action of the light control switch circuit 10. The silicon-controlled rectifier light-control drive circuit 20 is coupled to the light-control switch circuit 10, is controlled by the switching action of the light-control switch circuit 10, and is input with a mains power source. The output of the silicon-controlled rectifier light-controlled driving circuit 20 is coupled to the main circuit 30 to further control the main circuit 30 as a power converter.

For further explanation, please refer to FIG. 2, in which the light-controlled switching circuit 10 includes a light-controlled brake fluid component 12 and a first switching element Q1; the light-controlled brake fluid component 12 and the first switching element Q1 are connected in series. The light gate fluid assembly 12 has at least four ends. The light-controlled gate fluid assembly 12 is composed of at least two light-controlled gate fluids connected in series. For example, the light-controlled gate fluid U1 and A second photo-control brake fluid U2 is composed of two connected in series. Furthermore, the first terminal of the photo-control gate fluid component 12 is coupled to the DC power source VCC; the drain terminal of the first switching element Q1 is coupled to the second terminal of the photo-control gate fluid component 12 and the source of the first switching element Q1. Extreme grounding. The grounding of the source terminal is connected to the ground line (GNDS) of the DC power source VCC. The gate terminal of the first switching element Q1 is coupled to the driving switch signal SCRIO.

It should be noted that the first optically controlled sluice fluid U1 and the second optically controlled sluice fluid U2 each have four ends, as shown in FIG. 2. Furthermore, the first end of the first optically controlled sluice fluid U1 is The first end of the light-controlled gate fluid component 12; the second end of the second light-controlled gate fluid U2 is the second end of the light-controlled gate fluid component 12; the third end of the first light-controlled gate fluid U1 is the light control The third end of the brake fluid assembly 12; the fourth end of the second light-controlled brake fluid U2 is the fourth end of the light-controlled brake fluid assembly 12. Therefore, the first end of the first light-control brake fluid U1 is coupled to the DC power source VCC, and the third end of the first light-control brake fluid U1 is coupled to the silicon-controlled rectifier light-control driving circuit 20; and the second light-control The first end of the gate fluid U2 is coupled to the second end of the first light-controlled gate fluid U1; the second end of the second light-controlled gate fluid U2 is coupled to the drain terminal of the first switching element Q1; The third end of the gate fluid U2 is coupled to the fourth end of the first light-controlled gate fluid U1; the fourth end of the second light-controlled gate fluid U2 is coupled to the silicon-controlled rectifier light-control drive circuit 20.

In one embodiment, the light-controlled switch circuit 10 further includes a voltage stabilizing element ZD1, a first capacitor C1, a second resistor R2, and a first resistor R1. The cathode terminal of the voltage stabilizing element ZD1 is connected to the driver. The switching signal SCRIO, and the anode terminal of the voltage stabilizing element ZD1 is coupled to the gate terminal of the first switching element Q1; the first capacitor C1 and the second resistor R2 are connected in parallel; the first terminal of the first capacitor C1 (Figure 2 The upper end of C1 shown is also coupled to the gate terminal of the first switching element Q1, and the second end of the first capacitor C1 (the lower end of C1 shown in FIG. 2) is coupled to the source terminal of the first switching element Q1. . Through the connection relationship among the voltage stabilizing element ZD1, a first capacitor C1, and a second resistor R2, a driving circuit connection function for driving the switching signal SCRIO is formed. The two ends of the first resistor R1 are coupled to the first resistor R1 between the DC power source VCC and the photo-control brake fluid assembly 12. Between one end (also the first end of the first optically controlled gate fluid U1), the first resistor R1 mainly functions as a current limiting resistor.

The DC power source VCC is between + 10V and + 20V during actual operation. In addition, the driving switch signal SCRIO is a high-low potential signal for controlling the photo-control brake fluid assembly 12 and is a pulse wave signal. The light-controlled switching circuit 10 shown in FIG. 2 is a circuit that can be used to control the silicon-controlled rectifier (SCR) switch in a light-controlled manner, but this is only an illustrative embodiment. The present invention controls the silicon-controlled rectifier. Switch operation is not limited by this.

The silicon-controlled rectifier light-controlled driving circuit 20 disclosed in FIG. 2 has a mains power input. The silicon-controlled rectifier light-controlled driving circuit 20 includes a second controlled silicon-controlled rectifier switching element Q2 and a third controlled silicon-controlled rectifier switching element. Q3 and a first to fourth diodes D1 to D4. The cathode terminal of the second controlled silicon controlled rectifier switching element Q2 is coupled to the first end of the main circuit 30 (the upper end of the main circuit 30 in FIG. 2), and the cathode terminal of the third controlled silicon controlled rectifier switching element Q3 is coupled. At the anode terminal of the second controlled silicon controlled rectifier switching element Q2, and coupled to the mains power source. The cathode terminal of the first diode D1 is coupled to the gate terminal of the second controlled silicon controlled rectifier switching element Q2, and the anode terminal of the first diode D1 is coupled to the third terminal of the photo-controlled gate fluid component 12. The cathode terminal of the second diode D2 is coupled to the gate terminal of the third controlled silicon controlled rectifier switching element Q3, and the anode terminal of the second diode D2 is coupled to the anode terminal of the first diode D1. The anode terminal of the third diode D3 is coupled to the anode terminal of the second controlled silicon controlled rectifier switching element Q2, that is, to the mains power source, and the cathode terminal of the third diode D3 is coupled to the light control. The fourth end of the brake fluid assembly 12. The anode terminal of the fourth diode D4 is coupled to the anode terminal of the third controlled silicon controlled rectifier switching element Q3, and is coupled to the second terminal of the main circuit 30 (the lower end of the main circuit 30 in FIG. 2). The cathode terminal of the diode D4 is coupled to the cathode terminal of the third diode D3.

In one embodiment, the silicon-controlled rectifier light-controlled driving circuit further includes a second capacitor C2, a third capacitor C3, a seventh resistor R7, and an eighth resistor R8. The second capacitor C2 is connected in parallel with the seventh resistor R7; the first end of the second capacitor C2 (Figure The upper end of C2 shown in 2) is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2; the second end of the second capacitor C2 (the lower end of C2 shown in FIG. 2) is coupled to the first Gate of two controlled silicon controlled rectifier switching elements Q2. The third capacitor C3 is connected in parallel with the eighth resistor R8; the first terminal (the upper end of C3 shown in FIG. 2) of the third capacitor C3 is coupled to the cathode terminal of the third controlled silicon controlled rectifier switching element Q3; The second end of the third capacitor C3 (the lower end of C3 shown in FIG. 2) is coupled to the gate terminal of the third controlled silicon controlled rectifier switching element Q3.

In another embodiment, the silicon-controlled rectifier light-controlled driving circuit further includes a third voltage equalizing resistor R3, a fourth voltage equalizing resistor R4, a fifth resistor R5, and a sixth resistor R6. The first end of the third voltage equalizing resistor R3 (the upper end of R3 shown in FIG. 2) is coupled to the third end of the light control gate fluid component 12; the second terminal of the third voltage equalizing resistor R3 (the R3 shown in FIG. 2) (Lower end) is coupled to the first end of the fourth voltage equalizing resistor R4 and is coupled to a fifth end of the light-controlled gate fluid component 12, and the fifth end of the light-controlled gate fluid component 12 is the light-controlled gate. The contact end connected to the fourth end of the fluid U1 and the third end of the second light-control gate fluid U2. The second end (the lower end of R4 shown in FIG. 2) of the fourth voltage equalizing resistor R4 is coupled to the fourth end of the photo-control gate fluid component 12. The first end of the fifth resistor R5 (the left end of R5 shown in FIG. 2) is coupled to the gate terminal of the second controlled silicon controlled rectifier switching element Q2, and the second end of the fifth resistor R5 (shown in FIG. 2) The right end of R5) is coupled to the cathode end of the first diode D1. The first end of the sixth resistor R6 (the left end of R6 shown in FIG. 2) is coupled to the gate terminal of the third controlled silicon controlled rectifier switching element Q3, and the second end of the sixth resistor R6 (the right end of R6 shown in FIG. 2) ) Is coupled to the cathode terminal of the second diode D2.

The first to fourth diodes D1 to D4 are rectifying diodes, the fifth resistor R5, the seventh resistor R7, and the second capacitor C2 are the driving circuits of the second controlled silicon controlled rectifier switching element Q2; the sixth The resistor R6, the eighth resistor R8, and the third capacitor C3 are the driving circuits of the third controlled silicon controlled rectifier switching element Q3. The light-control brake fluid assembly 12 according to the present invention may be composed of a single or multiple light-control brake fluids (for example, the first light-control brake fluid U1 and the second light-control brake fluid U2) connected in series. The magnitude or voltage level of a voltage value. The above-mentioned first light-controlled gate fluid U1 is connected in parallel with the third equalizing pressure The resistor R3 and the second light-controlled gate fluid U2 are connected in parallel with the fourth voltage equalizing resistor R4, which is to evenly divide the voltage across the light-controlled gate fluid component 12, but the present invention is not limited to the above-mentioned method of equalizing the voltage, and can also be adopted Divide according to the voltage ratio of different proportions.

The main circuit 30 in FIG. 2 is coupled to the silicon-controlled rectifier light-control driving circuit 20. The main circuit 30 is provided with an A terminal (A shown in FIG. 2), a B terminal (B shown in FIG. 2), and A mains ground terminal; the A terminal of the main circuit is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2, and the B terminal of the main circuit is coupled to the third controlled silicon controlled rectifier switching element Q3 Anode terminal. Furthermore, the main circuit 30 includes a first DC-DC converter 31 and a second DC-DC converter 32. The first end of the first DC-DC converter 31 is a main circuit. The A terminal of 30, the second terminal of the first DC-DC converter is the mains ground terminal; the first terminal of the second DC-DC converter 32 is the B terminal of the main circuit 30, and the second DC-DC converter The second terminal of 32 is the mains ground terminal.

The first DC-DC converter 31 includes a first inductor L1, a fourth switching element Q4, a fifth diode D5, a fourth capacitor C4, and a sixth capacitor C6. The first end of the first inductor L1 (the left end of L1 shown in FIG. 2) is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2; the drain terminal of the fourth switching element Q4 is coupled to the first inductor L1. The second terminal (the right end of L1 shown in FIG. 2), the source terminal of the fourth switching element Q4 is coupled to the mains ground terminal; the anode terminal of the fifth diode D5 is coupled to the second terminal of the first inductor L1; The first end of the sixth capacitor C6 (the upper end of C6 shown in FIG. 2) is coupled to the cathode end of the fifth diode D5, and the second end of the sixth capacitor C6 (the lower end of C6 shown in FIG. 2) is coupled. To the mains ground; the first end of the fourth capacitor C4 (the upper end of C4 shown in FIG. 2) is coupled to the first end of the first inductor L1, and the second end of the fourth capacitor C4 (the C4 shown in FIG. 2) (Lower end) is coupled to the mains ground terminal.

The second DC-DC converter 32 includes a second inductor L2, a fifth switch Q5, a sixth diode D6, a fifth capacitor C5, and a seventh capacitor C7. The first end of the second inductor L2 (the left end of L2 shown in FIG. 2) is coupled to the anode terminal of the third controlled silicon controlled rectifier switching element Q3; the drain terminal of the fifth switching element Q5 Is coupled to the mains ground terminal, the source terminal of the fifth switching element Q5 is coupled to the second terminal of the second inductor L2 (the right end of L2 shown in FIG. 2); the cathode terminal of the sixth diode D6 is coupled to The second terminal of the second inductor L2; the first terminal of the fifth capacitor C5 (the lower end of C5 shown in FIG. 2) is coupled to the first terminal of the second inductor L2, and the second terminal of the fifth capacitor C5 (FIG. The upper end of C5 shown in 2) is coupled to the mains ground; the first end of the seventh capacitor C7 (the lower end of C7 shown in FIG. 2) is coupled to the anode end of the sixth diode D6, and the seventh capacitor The second end of C7 (the upper end of C7 shown in FIG. 2) is coupled to the mains ground terminal.

The main circuit 30 described in the present invention is a high-frequency DC-DC converter using a silicon controlled rectifier (SCR). This is only an embodiment, and is not limited to practical use. The circuit topology of the above converter.

3 and 4 are further circuit operation descriptions of the specific embodiment of the mains power input, but this circuit operation description is only an example of an embodiment, and is not intended to limit the technical solution protected by the present invention. Figure 3 shows the circuit operation of the positive half-cycle of the mains power supply. When the mains is in the positive half-cycle, its working state is that the mains current flows through the third diode D3, the second optically controlled gate fluid U2, and the first optically controlled gate fluid U1. , The first diode D1, the fifth resistor R5, and the seventh resistor R7, and then to the first DC-DC converter 31 in the main circuit 30. When the driving switch signal SCRIO is at a high potential, the first optical control gate The gate fluid element itself of the fluid U1 and the second optically controlled gate fluid U2 changes from high impedance to zero impedance, which causes the voltage on the seventh resistor R7 to rise, thereby turning on the second controlled silicon controlled rectifier switch Q2 and making its anode (A The voltage of the cathode (K) will drop to the normal on-state voltage drop. The voltage drop across the seventh resistor R7 is maintained at the steady-state driving voltage of the silicon controlled rectifier (SCR), and the driving current of the silicon controlled rectifier (SCR) is supplied by the utility Provided, it is a continuous transmission state with a low damage rate in the on state.

When the mains power is negative for half a week, its working state is shown in Figure 4. The mains current flows through the fourth diode D4, the second photo-control gate fluid U2, the first photo-control gate fluid U1, the second diode D2, and the first diode. The eight resistors R8 flow into the second DC-DC converter 32. When the driving switch signal SCRIO is at a high potential, the gate fluid elements of the first optically controlled gate fluid U1 and the second optically controlled gate fluid U2 are suddenly changed by high impedance. Zero impedance The voltage on the resistor R8 rises, so that the third controlled silicon controlled rectifier switching element Q3 is turned on, and the anode voltage of the anode cathode (AK) drops to a normal on-state voltage drop. The voltage drop on the eighth resistor R8 is maintained at the silicon controlled rectifier (SCR). ) Steady-state driving voltage. The driving current of the silicon controlled rectifier (SCR) is provided by the utility. It is a continuous state with low on-state damage.

The invention adjusts the SCR driving circuit so that the SCR on-resistance is continuous under the entire working condition, and the overall on-state damage is reduced, so that the SCR makes the SCR element have a lower on-state under a full load condition, especially under a light load condition. Damage, which improves work efficiency at light loads.

Through the above embodiments of the present invention, a light-controlled driving circuit capable of effectively adjusting the driving current according to the voltage of the mains can be provided, and a topology structure resistant to the high-voltage impact of the mains can be realized at the same time to improve the overall efficiency of the circuit. In addition, the circuit structure of the present invention is reliable and easy to implement, and can be used for the use of a DC converter to improve the efficiency, especially it can be applied to a high-power DC converter using a silicon controlled rectifier (SCR) as a switching device to improve its light load. Work efficiency.

In summary, the present invention proposes a high-voltage light-controlled driving circuit for commercial power, which can improve the lack of existing silicon-controlled rectifier (SCR) driving circuits, and effectively achieve the purpose of providing a converter with high efficiency. In addition, the technical effect of resisting the high-voltage impact of the utility power can be further realized, and the deficiency of the existing technology is effectively improved. It is obvious that the present invention has the requirements for applying for a patent.

However, what is described in the description of the present invention is only an example of a preferred embodiment. When the scope of protection of the present invention cannot be limited by it, any local changes, modifications or additions of technology still do not depart from the scope of protection of the present invention. in.

Claims (10)

The utility model relates to a high-voltage light-controlled driving circuit of a mains, which is used for high-voltage and high-current currents of the mains and a working condition of a mains surge. The high-voltage light-control driving circuit of the mains includes: a light-controlled switch circuit including a light-controlled brake fluid component and A first switching element Q1, the light-controlled switching circuit is input with a driving switching signal; the light-controlled brake fluid component is connected in series with the first switching element Q1, and the light-controlled brake fluid component has at least four ends; a silicon The rectifier light-controlled driving circuit has a mains power input and is coupled to the light-controlled switching circuit. The silicon-controlled rectifier light-controlled driving circuit includes: a second controlled silicon-controlled rectifier switching element Q2; A silicon controlled rectifier switching element Q3, a cathode terminal of the third controlled silicon controlled rectifier switching element Q3 is coupled to an anode terminal of the second controlled silicon controlled rectifier switching element Q2 and coupled to the mains power source; a first A diode D1, a cathode terminal of the first diode D1 is coupled to a gate terminal of the second controlled silicon controlled rectifier switching element Q2, and an anode terminal of the first diode D1 is coupled to the light-controlled gate. Fluid components The third terminal; a second diode D2, the cathode terminal of the second diode D2 is coupled to the gate terminal of the third controlled silicon controlled rectifier switching element Q3, and the anode terminal of the second diode D2 Coupled to the anode terminal of the first diode D1; a third diode D3; the anode terminal of the third diode D3 is coupled to the anode terminal of the second controlled silicon controlled rectifier switching element Q2, The cathode end of the third diode D3 is coupled to the fourth end of the photo-control gate fluid assembly; and a fourth diode D4, and the anode end of the fourth diode D4 is coupled to the third receiver. The anode terminal of the silicon controlled rectifier switching element Q3, the cathode terminal of the fourth diode D4 is coupled to the cathode terminal of the third diode D3, and a main circuit coupled to the silicon controlled rectifier light-controlled drive Circuit, the main circuit is provided with an A terminal, a B terminal, and a mains ground terminal; the A terminal of the main circuit is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2, and the B terminal of the main circuit is coupled Connected to the anode terminal of the third controlled silicon controlled rectifier switching element Q3. According to the item 1 of the request item, the high-voltage light-controlled driving circuit of the commercial power supply, wherein the light-controlled driving circuit of the silicon-controlled rectifier further includes: a second capacitor C2 and a seventh resistor R7. The second capacitor C2 and The seventh resistor R7 is connected in parallel; the first terminal of the second capacitor C2 is coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2; the second terminal of the second capacitor C2 is coupled to the first The gate ends of two controlled silicon controlled rectifier switching elements Q2; the silicon controlled rectifier optically controlled driving circuit further includes: a third capacitor C3 and an eighth resistor R8, the third capacitor C3 is in phase with the eighth resistor R8 Parallel connection; the first terminal of the third capacitor C3 is coupled to the cathode terminal of the third controlled silicon controlled rectifier switching element Q3; the second terminal of the third capacitor C3 is coupled to the third controlled silicon controlled rectifier The gate terminal of the switching element Q3. According to the item 1 of the request item, the high-voltage light-controlled driving circuit of the commercial power supply, wherein the light-controlled driving circuit of the silicon-controlled rectifier further includes: a third voltage equalizing resistor R3 and a fourth voltage equalizing resistor R4; A first terminal of the three voltage equalizing resistor R3 is coupled to the third terminal of the light-controlled gate fluid component; a second terminal of the third voltage equalizing resistor R3 is coupled to the first terminal of the fourth voltage equalizing resistor R4 and is coupled to Connected to a fifth end of the light control gate fluid component; the second end of the fourth voltage equalizing resistor R4 is coupled to the fourth end of the light control gate fluid component. According to the item 1 of the request item, the high-voltage light-controlled driving circuit of the commercial power supply, wherein the silicon-controlled rectifier light-controlled driving circuit further includes a fifth resistor R5 and a sixth resistor R6; Terminal is coupled to the gate terminal of the second controlled silicon controlled rectifier switching element Q2, and the second terminal of the fifth resistor R5 is coupled to the cathode terminal of the first diode D1; the first of the sixth resistor R6 A terminal is coupled to a gate terminal of the third controlled silicon controlled rectifier switching element Q3, and a second terminal of the sixth resistor R6 is coupled to a cathode terminal of the second diode D2. According to the item 1 of the request item, the high-voltage light-controlled driving circuit of the commercial power supply, wherein the light-controlled brake fluid assembly is composed of at least two light-controlled brake fluids connected in series, and the first end of the light-controlled brake fluid assembly is coupled Connected to the DC power source VCC; the drain terminal of the first switching element Q1 is coupled to the second end of the photo-control gate fluid assembly, the source terminal of the first switching element Q1 is grounded, and the source terminal is grounded to the DC power source. The ground of VCC is connected, and the gate terminal of the first switching element Q1 is coupled to the driving switch signal. According to the item 5 of the request item, the high-voltage light-controlled drive circuit of the mains, wherein the light-control brake fluid component includes: a first light-control brake fluid U1, a first end of the first light-control brake fluid U1 Is coupled to the DC power source VCC; the third end of the first photo-control gate fluid U1 is coupled to the anode end of the first diode D1; and a second photo-control gate fluid U2, the second photo-control gate fluid The first end of U2 is coupled to the second end of the first light-control gate fluid U1; the second end of the second light-control gate fluid U2 is coupled to the drain terminal of the first switching element Q1; the second light The third end of the gate control fluid U2 is coupled to the fourth end of the first light control gate fluid U1; the fourth end of the second light control gate fluid U2 is coupled to the cathode end of the fourth diode D4. According to the item 5, the high-voltage light-controlled driving circuit of the mains, wherein the light-controlled switching circuit further includes a voltage stabilizing element ZD1 and a first resistor R1, and a cathode terminal of the voltage stabilizing element ZD1 is connected to the driving switch. Signal, the anode terminal of the voltage stabilizing element ZD1 is coupled to the gate terminal of the first switching element Q1; the first resistor R1 is coupled between the DC power source VCC and the first end of the light-controlled gate fluid component. According to the item 7 of the request item, the high-voltage light-controlled driving circuit of the mains, wherein the light-controlled switch circuit further includes a first capacitor C1 and a second resistor R2; the first capacitor C1 and the second resistor R2 are Connected in parallel; the first terminal of the first capacitor C1 is coupled to the gate terminal of the first switching element Q1, and the second terminal of the first capacitor C1 is coupled to the source terminal of the first switching element Q1. According to the item 1 of the request, the mains high-voltage light-control drive circuit, wherein the main circuit includes a first DC-DC converter and a second DC-DC converter, the first DC-DC converter The first terminal of the converter is the A terminal of the main circuit, the second terminal of the first DC-DC converter is the mains ground terminal, and the first terminal of the second DC-DC converter is the main circuit. At terminal B, the second terminal of the second DC-DC converter is the mains ground terminal. According to the item 9 of the request, the mains high-voltage light-control drive circuit, wherein in the main circuit, the first DC-DC converter includes a first inductor L1, and a first terminal of the first inductor L1. Coupled to the cathode terminal of the second controlled silicon controlled rectifier switching element Q2; a fourth switching element Q4, the drain terminal of the fourth switching element Q4 is coupled to the second terminal of the first inductor L1, and the fourth A source terminal of the switching element Q4 is coupled to the mains ground terminal; a fifth diode D5, and an anode terminal of the fifth diode D5 is coupled to the second terminal of the first inductor L1; a fourth capacitor C4 A first terminal of the fourth capacitor C4 is coupled to the first terminal of the first inductor L1, a second terminal of the fourth capacitor C4 is coupled to the mains ground terminal; and a sixth capacitor C6, the sixth capacitor The first terminal of the capacitor C6 is coupled to the cathode terminal of the fifth diode D5, and the second terminal of the sixth capacitor C6 is coupled to the mains ground terminal; the second DC-DC converter includes: a second An inductor L2, a first terminal of the second inductor L2 is coupled to an anode terminal of the third controlled silicon controlled rectifier switching element Q3, and a fifth switching element Q5, The drain terminal of the fifth switching element Q5 is coupled to the mains ground terminal, and the source terminal of the fifth switching element Q5 is coupled to the second terminal of the second inductor L2; a sixth diode D6, and the sixth diode The cathode terminal of the electrode body D6 is coupled to the second terminal of the second inductor L2; a fifth capacitor C5, the first terminal of the fifth capacitor C5 is coupled to the first terminal of the second inductor L2, and the fifth The second terminal of the capacitor C5 is coupled to the mains ground terminal; and a seventh capacitor C7. The first terminal of the seventh capacitor C7 is coupled to the anode terminal of the sixth diode D6. The second terminal is coupled to the mains ground terminal.