High-power direct-current relay circuit and device

Abstract

The utility model relates to a high-power direct-current relay device and circuit. The high-power direct-current relay device comprises a circuit unit, the circuit unit comprises a direct current input circuit and an isolation amplification circuit which are electrically connected; the isolation amplification circuit is electrically connected with a power output circuit; the DC input circuit, the isolation amplification circuit and the power output circuit are electrically connected in sequence; a constant current source circuit and an oscillating circuit are arranged between the direct current input circuit and the isolation amplifying circuit; a half-wave rectifying circuit, a bleeder circuit, a voltage stabilizing circuit and a trigger circuit are arranged between the isolation amplifying circuit and the power output circuit; the device is reasonable in design, compact in structure and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high-power direct current relay circuit and device, which is widely applied to calculation and peripheral interface equipment, constant temperature system, temperature adjustment, electric furnace heating control, motor control, numerical control machinery, remote control system and industrial automation device. BACKGROUND

[0002] At present, the high-power direct current solid-state relays produced by domestic and foreign manufacturers are mostly plastic-sealed, large in size, and fixed in input voltage, and the size of the traditional direct current relay with a current of 100A is about 58mm*44.5mm*30mm, and the use environment is-45℃~85℃.

[0003] The high-power metal full-sealed direct current solid-state relay designed by the utility model has a rated value of 100A / 1200V, a wide input voltage range, isolation amplification, and is more reliable in work, and the maximum size is only 58mm*33mm*9.5mm, less than 1 / 3 of the traditional size, and the use environment is-55℃~125℃.

[0004] In addition, the traditional relay has the technical problems of unreasonable circuit design, power waste, and poor heat dissipation effect, and how to solve the above technical problems and optimize the circuit has become a technical problem to be solved urgently. INVENTION CONTENTS

[0005] The utility model solves the technical problem of providing a high-power direct current relay device. The utility model designs a high-power metal full-sealed direct current solid-state relay with a rated value of 100A / 1200V, a wide input voltage range, isolation amplification, and is more reliable in work. The volume is much smaller than similar products (about one third of the volume of the same type), which saves a lot of installation space for users; the metal full-sealed packaging can adapt to more severe application environments.

[0006] To solve the above problems, the technical scheme adopted by the utility model is:

[0007] A high-power direct current relay circuit, comprising a circuit unit; the circuit unit comprises a direct current input circuit and an isolation amplification circuit electrically connected; the isolation amplification circuit is electrically connected with a power output circuit;

[0008] The direct current input circuit, the isolation amplification circuit and the power output circuit are electrically connected in sequence;

[0009] There is a constant current source circuit and an oscillation circuit between the direct current input circuit and the isolation amplification circuit;

[0010] There is a half-wave rectification circuit, a bleeder circuit, a voltage stabilizing circuit and a trigger circuit between the isolation amplification circuit and the power output circuit.

[0011] As a further improvement of the above technical scheme:

[0012] The oscillation circuit comprises a transistor Q1; the base of the transistor Q1 is connected to Vin+ through the parallel connection of resistor R1 and capacitor C1;

[0013] The base of the transistor Q1 is connected to the control electrode Vin- through the parallel connection of resistor R2;

[0014] The capacitor C2 is electrically connected between the emitter and the base of the transistor Q1;

[0015] The emitter of the transistor Q1 is connected to the control electrode Vin- through resistor R3;

[0016] The capacitor C3 is electrically connected between the emitter and the collector of the transistor Q1.

[0017] The isolation amplification circuit comprises a transformer T, the primary winding of the transformer T is connected between the control electrode Vin+ and the collector of the transistor Q1;

[0018] The secondary winding of the transformer T is connected to a half-wave rectification circuit,

[0019] The half-wave rectification circuit comprises a diode D1 electrically connected to the secondary winding of the transformer T.

[0020] The bleeder circuit comprises a transistor Q2; the anti-inrush diode D2 is electrically connected between the emitter and the base of the transistor Q2, and the resistor R4 and the capacitor C4 are connected in parallel between the collector and the base of the transistor Q2;

[0021] The collector of the transistor Q2 is connected to the secondary winding loop of the transformer T;

[0022] The base of the transistor Q2 is connected to the output end of the diode D1;

[0023] The emitter of the transistor Q2 is electrically connected to a voltage stabilizing circuit and a trigger circuit.

[0024] The voltage stabilizing circuit comprises a reverse connection between the emitter of the transistor Q2 and the secondary winding loop;

[0025] The voltage stabilizing circuit comprises resistor R5 and resistor R6;

[0026] The power output circuit comprises MOS transistors Q3 and Q4;

[0027] The emitter of the transistor Q2 is connected to the gate of the MOS transistor Q3 through resistor R5 and to the gate of the MOS transistor Q4 through resistor R6, and the source of the MOS transistors Q3 and Q4 is electrically connected to the secondary winding loop;

[0028] The drain of the MOS transistors Q3 and Q4 outputs V0+, and the secondary winding loop outputs V0-.

[0029] A kind of high-power DC relay device, hardware unit includes shell and the circuit described above;Cover is provided on the shell;Power component and printed board assembly are provided on the cover;Power component and printed board assembly are electrically connected by aluminum wire;

[0030] Power component includes printed board;DC input circuit and isolation amplification circuit are provided on the printed board on the printed board;

[0031] Power component includes power output circuit;

[0032] Shell and cover adopt metal material;

[0033] Shell and cover adopt full sealing arrangement;

[0034] Power component and printed board assembly adopt side leg as pin.

[0035] The DC relay device of the utility model is far smaller than the metal full-sealing structure design of high-power DC solid-state relay of the same type product in market, and wide in working range.It is reasonable in design, low in cost, durable, safe and reliable, simple in operation, time and labor saving, fund saving, compact in structure and convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the physical use structure schematic view of printed board assembly of the utility model.

[0037] Figure 2 It is the overall circuit block diagram of the utility model.

[0038] Figure 3 It is the power output block diagram of the utility model.

[0039] Figure 4 It is the circuit principle schematic view of the utility model.

[0040] 1, printed board assembly;2, power component;3, cover;4, shell;5, aluminum wire. DETAILED DESCRIPTION

[0041] As Figures 1-4 shown, the utility model includes shell 4 on hardware;Cover 3 is provided on shell 4;Power component 2 and printed board assembly 1 are provided on cover 3;Power component 2 and printed board assembly 1 are electrically connected by aluminum wire 5;

[0042] Power component 2 includes power output circuit;

[0043] Printed board assembly 1 includes electrically connected DC input circuit, isolation amplification circuit (isolation boost circuit);

[0044] The circuit is a direct current solid-state relay in principle, and the direct current input circuit, the isolation amplification circuit (also called isolation voltage-boosting circuit or isolation voltage-multiplying circuit) and the power output circuit are electrically connected.

[0045] The direct current control power source is electrically connected to the direct current input circuit, the isolation amplification circuit and the power output circuit in sequence.

[0046] The direct current input circuit uses the constant current source control mode to generate self-excitation oscillation, and the input circuit can be applied to a wide input voltage range.

[0047] The isolation amplification circuit uses transformer isolation and amplification through the voltage-boosting circuit to ensure the normal opening of the power device; the output circuit is two MOS transistors in parallel, which increases the current, reduces the internal resistance and lowers the loss.

[0048] There are constant current source circuits and oscillation circuits between the direct current input circuit and the isolation amplification circuit.

[0049] There are half-wave rectification circuits, bleeder circuits, voltage stabilizing circuits and trigger circuits between the isolation amplification circuit and the power output circuit.

[0050] The oscillation circuit includes a triode Q1; one way of the base of the triode Q1 is connected to Vin+ through the parallel connection of a resistor R1 and a capacitor C1.

[0051] The other way of the base of the triode Q1 is connected to the control electrode Vin- through the parallel connection of a resistor R2.

[0052] The capacitor C2 is electrically connected between the emitter and the base of the triode Q1.

[0053] The emitter of the triode Q1 is connected to the control electrode Vin- through a resistor R3.

[0054] The capacitor C3 is electrically connected between the emitter and the collector of the triode Q1.

[0055] The isolation amplification circuit includes a transformer T, and the primary coil of the transformer T is connected between the control electrode Vin+ and the collector of the triode Q1.

[0056] The secondary coil of the transformer T is connected to a half-wave rectification circuit,

[0057] The half-wave rectification circuit includes a diode D1 electrically connected to the secondary coil of the transformer T.

[0058] The bleeder circuit includes a triode Q2; the diode D2 is electrically connected between the emitter and the base of the triode Q2, and the resistor R4 and the capacitor C4 are connected in parallel between the collector and the base of the triode Q2.

[0059] The collector of the triode Q2 is connected to the secondary coil loop of the transformer T.

[0060] The base of the triode Q2 is connected to the output end of the diode D1;

[0061] The emitter of the triode Q2 is electrically connected with a voltage stabilizing circuit and a trigger circuit;

[0062] The voltage stabilizing circuit comprises a resistor R5 and a resistor R6;

[0063] The voltage stabilizing circuit comprises a resistor R5 and a resistor R6;

[0064] The emitter of the triode Q2 is electrically connected with a voltage stabilizing circuit and a trigger circuit;

[0065] The emitter of the triode Q2 is electrically connected with a voltage stabilizing circuit and a trigger circuit;

[0066] Turn on: the control pole Vin opens the signal to generate a sine wave in the front stage of the transformer T through the sine wave oscillation circuit, and the sine wave is isolated and boosted to the rear stage through the transformer T, and then the sine wave is half-wave rectified through the diode D1, the anti-backflow diode and the driving resistor, so as to trigger the MOS to be conductive, and the relay is turned on.

[0067] Turn off: the control pole Vin has no input, and no current passes through the front stage, and no input passes through the rear stage, so that the discharge triode is opened, the parasitic capacitance of the power MOS gate is discharged through the driving resistor and Q2, the power MOS is turned off, and the relay is turned off.

[0068] The utility model discloses a novel metal full-sealed structure is adopted in the structure design, the side surface is out of the leg, and the volume is greatly reduced, and the heat dissipation performance is good.

[0069] The utility model fully describes is to disclose more clearly, and the prior art is not enumerated one by one.

[0070] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and are not limited thereto; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; as the person skilled in the art combines the plurality of technical solutions of the utility model, it is obvious that these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the utility model embodiments. The technical contents not described in the utility model are all known technologies.

Claims

1. A high-power DC relay circuit, characterized in that: It includes a circuit unit; the circuit unit includes an electrically connected DC input circuit and an isolation amplifier circuit; the isolation amplifier circuit is electrically connected to a power output circuit; The DC input circuit, isolation amplifier circuit, and power output circuit are electrically connected in sequence. There is a constant current source circuit and an oscillation circuit between the DC input circuit and the isolation amplifier circuit; Between the isolation amplifier circuit and the power output circuit are a half-wave rectifier circuit, a bleeder circuit, a voltage regulator circuit, and a trigger circuit.

2. The high-power DC relay circuit according to claim 1, characterized in that: The oscillation circuit includes transistor Q1; the base of transistor Q1 is connected to Vin+ through a parallel resistor R1 and capacitor C1. The base of transistor Q1 is connected to the control electrode Vin- through a parallel resistor R2. The emitter and base of transistor Q1 are electrically connected by capacitor C2; The emitter of transistor Q1 is connected to the control terminal Vin- through resistor R3; A capacitor C3 is electrically connected between the emitter and collector of transistor Q1.

3. The high-power DC relay circuit according to claim 2, characterized in that: The isolation amplifier circuit includes a transformer T, whose main winding is connected between the control electrode Vin+ and the collector of transistor Q1. The secondary coil of transformer T is connected to a half-wave rectifier circuit. The half-wave rectifier circuit includes a diode D1 electrically connected to the secondary line of transformer T.

4. The high-power DC relay circuit according to claim 3, characterized in that: The discharge circuit includes transistor Q2; the emitter and base of transistor Q2 are electrically connected to anti-reverse current diode D2, and a resistor R4 and a capacitor C4 are connected in parallel between the collector and base of transistor Q2. The collector of transistor Q2 is connected to the secondary coil circuit of transformer T; The base of transistor Q2 is connected to the output terminal of diode D1; The emitter of transistor Q2 is electrically connected to a voltage regulator circuit and a trigger circuit.

5. The high-power DC relay circuit according to claim 4, characterized in that: The voltage regulator circuit includes a circuit that is reverse-connected between the emitter of transistor Q2 and the secondary coil circuit; The voltage regulator circuit includes resistors R5 and R6; The power output circuit includes MOSFETs Q3 and Q4; The emitter of transistor Q2 is connected to the gate of MOSFET Q3 through resistor R5, and to the gate of MOSFET Q4 through resistor R6. The sources of MOSFETs Q3 and Q4 are electrically connected to the secondary coil circuit. The drain output of MOSFETs Q3 and Q4 is V0+, and the secondary coil circuit outputs V0-.

6. A high-power DC relay device, characterized in that: The hardware unit includes a housing (4) and the circuit described in claim 1; a cover plate (3) is provided on the housing (4); a power component (2) and a printed circuit board assembly (1) are provided on the cover plate (3); the power component (2) and the printed circuit board assembly (1) are electrically connected by an aluminum wire (5); The power component (2) includes a printed circuit board; a DC input circuit and an isolation amplifier circuit are provided on the printed circuit board; The power component (2) includes a power output circuit; The outer shell (4) and cover plate (3) are made of metal; The outer casing (4) and the cover plate (3) are fully sealed; The power component (2) and the printed circuit board assembly (1) use side-mounted leads as pins.

Images