CN211577705U

CN211577705U - Silicon controlled rectifier control circuit based on resistance-capacitance voltage reduction power supply

Info

Publication number: CN211577705U
Application number: CN202020474037.9U
Authority: CN
Inventors: 陈明; 王红亚
Original assignee: Zhejiang Zuoao Technology Co ltd
Current assignee: Zhejiang Zuoao Technology Co ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-09-25
Anticipated expiration: 2030-04-03

Abstract

The utility model relates to a silicon controlled rectifier control circuit based on resistance-capacitance step-down power, include the resistance-capacitance step-down full wave rectifier circuit that can convert alternating current power supply in the commercial power into first DC power supply (VCC) and second DC power supply (VDD), and be used for carrying out the control circuit that controls silicon controlled rectifier (TR1) with resistance-capacitance step-down full wave rectifier circuit electricity is connected, its characterized in that: the control circuit comprises an MCU single chip microcomputer, a diode (D2), an NPN triode (Q1), a PNP triode (Q2), a fifth resistor (R5), a sixth resistor (R6), a seventh circuit (R7), an eighth resistor (R8), a ninth resistor (R9) and a tenth resistor (R10). Compared with the prior art, the utility model has the advantages of: the cost is lower, and the circuit has great competitive advantage on the occasion that the number of the controlled silicon is less, and is more beneficial to the circuit design with higher integration level.

Description

Silicon controlled rectifier control circuit based on resistance-capacitance voltage reduction power supply

Technical Field

The utility model relates to a silicon controlled rectifier control circuit based on resistance-capacitance step-down power.

Background

The trigger control of the controllable silicon has four control phases, and most controllable silicon has only the first three phases. The common feature of these control modes is that the trigger power supply and the load power supply have a common terminal connected to the cathode of the thyristor, and the control equivalent circuit diagrams of different phases of the thyristor are shown in fig. 1a to fig. 1 d. Due to the characteristic of silicon controlled rectifier control, a half-wave rectification mode is adopted when the resistance-capacitance voltage reduction is used as a trigger power supply.

Because the resistance-capacitance voltage reduction full-wave rectifying circuit is more economical than voltage reduction of a transformer, the output current is not large, although the resistance connected in series on a power supply is lossy, is not isolated from strong current and is unsafe to use, the power supply is often used as a driving power supply of a silicon controlled rectifier on occasions with low cost, low voltage and small load. Such as some electric fans, and also fan heaters. The half-wave rectified reference circuit of the thyristor is shown in fig. 2. The silicon controlled rectifier driving mode is that the second phase and the third phase of the silicon controlled rectifier TR1 are used for driving, the driving power supply of the silicon controlled rectifier is a resistance-capacitance voltage reduction half-wave rectification power supply, and because the half-wave rectification efficiency is low, only half current passing through a safety capacitor can be used, and the quantity of the driven silicon controlled rectifier or other LED lamps is small. Or a little more low voltage load, a larger ballast capacitor is used, which increases the cost considerably, is less advantageous than a transformer, and does not allow such a large capacitor to be added due to space limitations of the circuit board.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a silicon controlled rectifier control circuit based on resistance-capacitance step-down full wave rectifier circuit that cost is lower is provided to above-mentioned prior art.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a silicon controlled rectifier control circuit based on resistance-capacitance step-down power, includes can convert the alternating current power supply in the commercial power into the resistance-capacitance step-down full wave rectifier circuit of first direct current power supply and second direct current power supply, and the control circuit who is used for carrying out control to the silicon controlled rectifier that is connected with resistance-capacitance step-down full wave rectifier circuit electricity, its characterized in that: the control circuit comprises an MCU singlechip, a diode, a PNP triode, an NPN triode, a fifth resistor, a sixth resistor, a seventh circuit, an eighth resistor, a ninth resistor and a tenth resistor, wherein the first phase of a controlled silicon is connected with a live wire of a mains supply, the third phase of the controlled silicon is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the negative electrode of the diode, the positive electrode of the diode is connected with the collector electrode of the PNP triode, the emitter electrode of the PNP triode is connected with a second direct current power supply output by the resistance-capacitance voltage reduction full-wave rectifying circuit, the base electrode of the PNP triode is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with an IO port of the MCU singlechip, the first end of the eighth resistor is connected with the base electrode of the PNP triode, the second end of the eighth resistor is connected with the second direct current power supply output by the resistance-capacitance voltage reduction full-wave rectifying circuit, the, the second end of the ninth resistor is connected with a collector of the NPN triode, a base of the NPN triode is connected with the first end of the seventh circuit, the second end of the seventh circuit is connected with a collector of the PNP triode, the first end of the tenth resistor is connected with a base of the NPN triode, the second end of the tenth resistor is connected with a first direct-current power supply output by the resistance-capacitance voltage reduction full-wave rectifying circuit, and an emitter of the NPN triode is also connected with a first direct-current power supply output by the resistance-capacitance voltage reduction full-wave rectifying circuit; and a power supply port of the MCU singlechip is connected with a second direct-current power supply output by the resistance-capacitance voltage reduction full-wave rectification circuit.

As an improvement, the resistance-capacitance voltage reduction full-wave rectification circuit comprises a first safety capacitor, a second safety capacitor, a first capacitor, a second capacitor, a first resistor, a second resistor, a third circuit, a fourth resistor, a rectifier bridge, a first diode and a second diode, wherein two ends of the first safety capacitor are respectively connected with a live wire and a zero wire of a mains supply, two ends of the second resistor are respectively connected with a live wire and a zero wire of the mains supply, a first end of the first resistor is connected with the electric zero wire, a second end of the first resistor is connected with a first end of the third circuit, a second end of the third circuit is connected with a second alternating current input end of the rectifier bridge, a first alternating current input end of the rectifier bridge is connected with the live wire of the mains supply, a first end of the second safety capacitor is connected with a first end of the first resistor, and a second end of the second safety capacitor is connected with a second end of the first resistor; the negative output end of the direct current power supply of the rectifier bridge is grounded; the voltage output by the positive output end of the direct-current power supply of the rectifier bridge is the second direct-current power supply, and the voltage output by the negative output end of the direct-current power supply of the rectifier bridge is the first direct-current power supply; the first end of the fourth resistor is connected with the positive output end of the direct-current power supply of the rectifier bridge, and the second end of the fourth resistor is connected with the negative output end of the direct-current power supply of the rectifier bridge; the positive electrode of the first capacitor is connected with the positive electrode output end of the direct-current power supply of the rectifier bridge, and the negative electrode of the first capacitor is connected with the negative electrode output end of the direct-current power supply of the rectifier bridge; the cathode of the first diode is connected with the anode output end of the direct-current power supply of the rectifier bridge, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with the cathode output end of the direct-current power supply of the rectifier bridge; the anode of the second capacitor is connected with the anode of the first diode, and the cathode of the second capacitor is grounded; the first end of the capacitor is connected with the anode of the first diode, and the second end of the capacitor is grounded.

Compared with the prior art, the utility model has the advantages of: the VCC power and the VDD power with resistance-capacitance step-down full wave rectifier circuit use in the silicon controlled rectifier trigger drive, utilize the first phase place of silicon controlled rectifier and third phase place trigger drive, use respectively in the negative half-wave and the positive half-wave of the positive mysterious wave of 220VAC commercial power for the same load can use the electric capacity of less capacity and the electric capacity of less volume, consequently the utility model discloses more be favorable to the higher circuit design of integrated level.

Drawings

FIG. 1a is a schematic diagram of a first phase driving scheme of a thyristor;

FIG. 1b is a schematic diagram of the second phase driving of the SCR;

FIG. 1c is a schematic diagram of a third phase driving scheme of the thyristor;

FIG. 1d is a fourth phase driving schematic diagram of the SCR;

FIG. 2 is a schematic diagram of a thyristor driving circuit of a resistance-capacitance step-down half-wave rectifier circuit in the prior art;

fig. 3 is a schematic diagram of the thyristor control circuit based on the rc step-down power supply in the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The thyristor control circuit based on the resistance-capacitance voltage reduction power supply shown in fig. 3 comprises a resistance-capacitance voltage reduction full-wave rectification circuit which can convert an alternating current power supply in a mains supply into a first direct current power supply VCC and a second direct current power supply VDD, and a control circuit which is electrically connected with the resistance-capacitance voltage reduction full-wave rectification circuit and is used for controlling the thyristor TR 1.

Wherein, the control circuit comprises an MCU singlechip, a diode D2, a PNP triode Q1, an NPN triode Q2, a fifth resistor R5, a sixth resistor R6, a seventh circuit R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, wherein, the first phase of a controlled silicon TR1 is connected with the live wire of the commercial power, the third phase of the controlled silicon TR1 is connected with the first end of the fifth resistor R5, the second end of the fifth resistor R5 is connected with the negative electrode of a diode D2, the positive electrode of the diode D2 is connected with the collector of the PNP triode Q1, the emitter of the PNP triode Q1 is connected with a second DC power supply VDD output by the full-wave rectification circuit of resistance-capacitance voltage reduction, the base of the PNP triode Q1 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the IO port of the MCU triode, the first end of the eighth resistor R8 is connected with the base of the PNP Q1, the second resistor R8 is connected with the full-capacitance voltage reduction rectification circuit, a first end of a ninth resistor R9 is connected with a first end of a fifth resistor R5, a second end of a ninth resistor R9 is connected with a collector of an NPN triode Q2, a base of the NPN triode Q2 is connected with a first end of a seventh circuit R7, a second end of a seventh circuit R7 is connected with a collector of a PNP triode Q1, a first end of a tenth resistor R10 is connected with a base of an NPN triode Q2, a second end of the tenth resistor R10 is connected with a first direct current power supply-VCC output by the resistor-capacitor buck full-wave rectifying circuit, and an emitter of the NPN triode Q2 is also connected with the first direct current power supply-VCC output by the resistor-capacitor buck full-wave rectifying circuit; and a power supply port of the MCU singlechip is connected with a second direct current power supply VDD output by the resistance-capacitance voltage reduction full-wave rectification circuit.

The resistance-capacitance voltage reduction full-wave rectification circuit comprises a first safety capacitor CX1, a second safety capacitor CX2, a first capacitor E1, a second capacitor E2, a capacitor C1, a first resistor R1, a second resistor R2, a third circuit R3, a fourth resistor R4, a rectification bridge D1, a first diode ZD1 and a second diode ZD2, the two ends of a first safety regulation capacitor CX1 are respectively connected with a live wire and a zero wire of a mains supply, the two ends of a second resistor R2 are also respectively connected with the live wire and the zero wire of the mains supply, the first end of the first resistor R1 is connected with the electric zero wire, the second end of the first resistor R1 is connected with the first end of a third circuit R3, the second end of the third circuit R3 is connected with the second alternating current input end of a rectifier bridge D1, the first alternating current input end of the rectifier bridge D1 is connected with the live wire of the mains supply, the first end of the second safety regulation capacitor CX2 is connected with the first end of a first resistor R1, and the second end of the second safety regulation capacitor CX2 is connected with the second end of a first resistor R1; the negative output end of the direct-current power supply of the rectifier bridge D1 is grounded; the voltage output by the positive output end of the direct-current power supply of the rectifier bridge D1 is the second direct-current power supply VDD, and the voltage output by the negative output end of the direct-current power supply of the rectifier bridge D1 is the first direct-current power supply-VCC; a first end of the fourth resistor R4 is connected with the positive output end of the direct-current power supply of the rectifier bridge D1, and a second end of the fourth resistor R4 is connected with the negative output end of the direct-current power supply of the rectifier bridge D1; the positive electrode of the first capacitor E1 is connected with the positive electrode output end of the direct-current power supply of the rectifier bridge D1, and the negative electrode of the first capacitor E1 is connected with the negative electrode output end of the direct-current power supply of the rectifier bridge D1; the cathode of the first diode ZD1 is connected with the anode output end of the direct current power supply of the rectifier bridge D1, the anode of the first diode ZD1 is connected with the cathode of the second diode ZD2, and the anode of the second diode ZD2 is connected with the cathode output end of the direct current power supply of the rectifier bridge D1; the anode of the second capacitor E2 is connected with the anode of the first diode ZD1, and the cathode of the second capacitor E2 is grounded; a first terminal of the capacitor C1 is connected to the positive terminal of the first diode ZD1 and a second terminal of the capacitor C1 is connected to ground.

The trigger control method of the silicon controlled rectifier adopts a first phase and a third phase for driving, the driving mode just adopts the characteristic of a resistance-capacitance voltage reduction full-wave rectification power supply, when the IO port of the single chip microcomputer outputs a low level, the silicon controlled rectifier TR1 is conducted, and the trigger principle of the silicon controlled rectifier TR1 is as follows: when the power grid is in a positive half-wave state, the AC-L of the mains supply input end is in a positive voltage, the voltage of the AC-L is higher than the VDD by one diode forward voltage drop, the NPN triode Q1 and the PNP triode Q2 are conducted, the diode D2 is in a positive stop state, at this time, the trigger current flows from the AC-L through the controllable silicon TR1 and the ninth resistor R9 and then through the NPN triode Q2 to the negative VCC, and the controllable silicon TR1 works under the trigger of a third phase position; when the commercial power is negative half-wave, the 'AC-L' of the commercial power input end is negative voltage, the voltage of the 'AC-L' is lower than that of a power supply '-VCC' by one diode forward voltage drop, the NPN triode Q2 is in a cut-off state (the voltage difference between a collector and an emitter is small), the PNP triode Q1 is in a conducting state, at the moment, the trigger current flows from the 'VDD' end through the PNP triode Q1, the diode D2, the fifth resistor R5 and the silicon controlled rectifier TR1 to flow to the 'AC-L', and the silicon controlled rectifier TR1 works under the trigger of the first phase. When the IO port outputs a high level, the PNP transistor Q1 is in an off state, the NPN transistor Q2 is also in an off state under the blocking of the pull-down resistor R10 and the diode D2, and the thyristor TR1 is also in an off state. The trigger driving mode of the silicon controlled rectifier solves the problem that the traditional silicon controlled rectifier trigger driving can only be based on a resistance-capacitance voltage reduction half-wave rectification power supply, expands the trigger driving application of the silicon controlled rectifier based on the resistance-capacitance voltage reduction full-wave rectification power supply and greatly improves the current utilization rate of the resistance-capacitance voltage reduction power supply; under the same load, the capacitance value of the safety capacitor (or CBB capacitor) used on the resistance-capacitance voltage reduction full-wave rectification power supply is half of that of the safety capacitor (or CBB capacitor) used on the resistance-capacitance voltage reduction half-wave rectification power supply. The full-wave rectification is lower in cost than the half-wave rectification in terms of power supply, and the cost is slightly increased in terms of the silicon controlled rectifier control part. In application, the fan heater has great competitive advantage on the occasions with less silicon controlled rectifiers, so that the fan heater is worthy of great popularization on the application of a control panel of the fan heater (only 1 silicon controlled rectifier and other relays).

Claims

1. The utility model provides a silicon controlled rectifier control circuit based on resistance-capacitance step-down power, includes can convert alternating current power supply in the commercial power into the resistance-capacitance step-down full wave rectifier circuit of first direct current power supply (-VCC) and second direct current power supply (VDD), and with the control circuit that is used for carrying out control to silicon controlled rectifier (TR1) that resistance-capacitance step-down full wave rectifier circuit electricity is connected, its characterized in that: the control circuit comprises an MCU singlechip, a diode (D2), a PNP triode (Q1), an NPN triode (Q2), a fifth resistor (R5), a sixth resistor (R6), a seventh circuit (R7), an eighth resistor (R8), a ninth resistor (R9) and a tenth resistor (R10), wherein a first phase of a controlled silicon (TR1) is connected with a live wire of a mains supply, a third phase of the controlled silicon (TR1) is connected with a first end of a fifth resistor (R5), a second end of the fifth resistor (R5) is connected with a negative electrode of a diode (D2), a PNP of the diode (D2) is connected with a collector of the triode (Q1), an emitter of the PNP triode (Q1) is connected with a second direct current power supply (VDD) output by the resistance-capacitance full-wave rectification circuit, a base of the PNP triode (Q1) is connected with a first end of the sixth resistor (R6), a second end of a sixth resistor (R6) is connected with an IO port of the MCU, a first end of an eighth resistor (R8) is connected with a base electrode of a PNP triode (Q1), a second end of an eighth resistor (R8) is connected with a second direct current power supply (VDD) output by the resistance-capacitance voltage reduction full-wave rectifying circuit, a first end of a ninth resistor (R9) is connected with a first end of a fifth resistor (R5), a second end of a ninth resistor (R9) is connected with a collector electrode of an NPN triode (Q2), a base electrode of the NPN triode (Q2) is connected with a first end of a seventh circuit (R7), a second end of the seventh circuit (R7) is connected with a collector electrode of the PNP triode (Q1), a first end of a tenth resistor (R10) is connected with a base electrode of the NPN triode (Q2), a second end of a tenth resistor (R10) is connected with a first direct current power supply (-VCC) output by the resistance-capacitance voltage reduction full-wave rectifying circuit, and an emitter electrode of the NPN triode (Q2) is also connected with a first direct current power supply (-VCC) output by the first resistance-capacitance voltage reduction; and a power supply port of the MCU singlechip is connected with a second direct current power supply (VDD) output by the resistance-capacitance voltage reduction full-wave rectification circuit.

2. The SCR-based control circuit of claim 1, wherein: the resistance-capacitance voltage reduction full-wave rectifying circuit comprises a first safety capacitor (CX1), a second safety capacitor (CX2), a first capacitor (E1), a second capacitor (E2), a capacitor (C1), a first resistor (R1), a second resistor (R2), a third circuit (R3), a fourth resistor (R4), a rectifying bridge (D1), a first diode (ZD1) and a second diode (ZD2), wherein two ends of the first safety capacitor (CX1) are respectively connected with a live wire and a zero wire of a mains supply, two ends of the second resistor (R2) are respectively connected with the live wire and the zero wire of the mains supply, a first end of the first resistor (R1) is connected with the electric zero wire, a second end of the first resistor (R1) is connected with a first end of a third circuit (R3), a second end of the third circuit (R3) is connected with a second alternating current input end of the rectifying bridge (D1), and a first input end of the rectifying bridge (D1) is connected with an alternating current input end of the rectifying bridge, the first end of the second safety capacitor (CX2) is connected with the first end of the first resistor (R1), and the second end of the second safety capacitor (CX2) is connected with the second end of the first resistor (R1); the negative output end of the direct current power supply of the rectifier bridge (D1) is grounded; the voltage output by the positive output end of the direct current power supply of the rectifier bridge (D1) is the second direct current power supply (VDD), and the voltage output by the negative output end of the direct current power supply of the rectifier bridge (D1) is the first direct current power supply (-VCC); the first end of the fourth resistor (R4) is connected with the positive output end of the direct-current power supply of the rectifier bridge (D1), and the second end of the fourth resistor (R4) is connected with the negative output end of the direct-current power supply of the rectifier bridge (D1); the positive electrode of the first capacitor (E1) is connected with the positive electrode output end of the direct-current power supply of the rectifier bridge (D1), and the negative electrode of the first capacitor (E1) is connected with the negative electrode output end of the direct-current power supply of the rectifier bridge (D1); the cathode of the first diode (ZD1) is connected with the anode output end of the direct current power supply of the rectifier bridge (D1), the anode of the first diode (ZD1) is connected with the cathode of the second diode (ZD2), and the anode of the second diode (ZD2) is connected with the cathode output end of the direct current power supply of the rectifier bridge (D1); the anode of the second capacitor (E2) is connected with the anode of the first diode (ZD1), and the cathode of the second capacitor (E2) is grounded; a first terminal of the capacitor (C1) is connected to the anode of the first diode (ZD1) and a second terminal of the capacitor (C1) is connected to ground.