Multi-channel temperature control driver

Abstract

The utility model discloses a multichannel temperature control driver, which comprises a controller and at least one group of driving unit, the driving unit comprises a thyristor and an optical coupling isolation circuit, the T1 end and the T2 end of the thyristor are connected to a power supply loop of a load, two input ends of the optical coupling isolation circuit are connected to the controller, and the T1 end and the T2 end of the thyristor are connected to the power supply loop of the load. And two output ends of the optocoupler isolation circuit are respectively connected to the T1 end and the G end of the thyristor. According to the multichannel temperature control driver of the utility model, the thyristors and the optocoupler isolation circuits are adopted to form at least one group of driving units, the controller outputs control signals to control the on-off of the thyristors through the optocoupler isolation circuits, and multichannel PWM control temperature adjustment is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of PWM control temperature regulation, in particular to a multi-channel temperature control driver. Background Art

[0002] In existing temperature control systems, contactors and solid-state relays are mostly used as temperature control heating drivers, all of which are single-channel. Therefore, in multi-channel temperature control system applications, a large number of contactors or solid-state relays are required, which requires a large installation space and is inconvenient to install and maintain. In addition, contactors as heating drivers cannot be used in temperature control systems that require PWM control and temperature adjustment. Utility Model Content

[0003] The purpose of the invention of the utility model is to provide a multi-channel temperature control driver to achieve multi-channel PWM control temperature adjustment in view of the above problems.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0005] A multi-channel temperature control driver comprises a controller and at least one driving unit, wherein the driving unit comprises a thyristor and an optocoupler isolation circuit, wherein the T1 terminal and T2 terminal of the thyristor are connected to a power supply circuit of a load, the two input terminals of the optocoupler isolation circuit are connected to the controller, and the two output terminals of the optocoupler isolation circuit are respectively connected to the T1 terminal and the G terminal of the thyristor.

[0006] The optocoupler isolation circuit includes an optocoupler and a diode, the two input ends of the optocoupler are connected to a diode, the first output end of the optocoupler is connected to the T1 end of the thyristor through a switch resistor, the second output end of the optocoupler is connected to the G end of the thyristor, and the G end of the thyristor is connected to the negative pole of the power supply after being connected to its T2 end through another switch resistor. The number of drive units is 12 groups. The thyristor is a bidirectional thyristor.

[0007] The multi-channel temperature control driver also includes a fuse, which is arranged on the power supply circuit to protect the driver from overcurrent caused by load short circuit or overload.

[0008] As described above, thyristors and optocoupler isolation circuits are used to form at least one driving unit, and the controller outputs a control signal to control the on and off of the thyristors via the optocoupler isolation circuit, thereby realizing multi-channel PWM control temperature regulation.

[0009] Based on the above solution, in an improved solution, the multi-channel temperature control driver further includes a current transformer, the primary side of the current transformer is arranged at the positive input terminal and the negative output terminal of the load, and the signal output terminal of the current transformer is connected to the controller. Heater current detection can be performed.

[0010] Based on the above scheme, in an improved scheme, the multi-channel temperature control driver also includes an absorption circuit, which is arranged between the negative output terminal of the load and the negative pole of the power supply; wherein the absorption circuit includes two absorption capacitors and an absorption resistor, and the absorption resistor and an absorption capacitor are connected in series and then connected in parallel with another absorption capacitor, so as to absorb the peak voltage caused by the switching load.

[0011] Based on the above solution, in an improved solution, the multi-channel temperature control driver further includes a varistor connected between the positive input terminal of the load and the negative terminal of the power supply to absorb the peak overvoltage of the load power supply circuit.

[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0013] The utility model discloses a multi-channel temperature control driver, which adopts thyristors and optical coupling isolation circuits to form at least one driving unit. A controller outputs a control signal to control the switching of the thyristors through the optical coupling isolation circuit, thereby realizing multi-channel PWM control temperature regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a 1-6 channel circuit diagram of driver example 1 of the utility model.

[0015] Figure 2 yes Figure 1 Enlarged diagram of the 1st channel circuit.

[0016] Figure 3 yes Figure 1 A magnified view of the controller.

[0017] Figure 4 yes Figure 1 Magnified view of the connector.

[0018] Figure 5 It is a 7-12 channel circuit diagram of driver example 1 of the utility model. DETAILED DESCRIPTION

[0019] Example 1

[0020] See also Figure 1-Figure 5 A multi-channel temperature control driver of the present embodiment 1 includes a controller and at least one driving unit, the driving unit includes a thyristor and an optocoupler isolation circuit, the T1 terminal and T2 terminal of the thyristor are connected to the power supply circuit of the load, the two input terminals of the optocoupler isolation circuit are connected to the controller, and the two output terminals of the optocoupler isolation circuit are respectively connected to the T1 terminal and the G terminal of the thyristor.

[0021] Among them, the number of drive units is 2 groups or 3 groups, etc., and this embodiment is described by taking 12 groups as an example. The thyristor can be a unidirectional thyristor or a bidirectional thyristor, and this embodiment is described by taking a bidirectional thyristor as an example. The controller and its connection control are both existing technologies, and can be connected using the factory configuration standard line according to the instructions; 1 controller can be used; considering that the connection pins may not be enough, 2 controllers can also be used; this embodiment is described by taking controller J1 and controller J2 as an example. Similarly, this embodiment is described by taking the example of connecting connectors H1 and H2 connected to the mains (AC220V) as an example.

[0022] In each optocoupler isolation circuit, the optocoupler isolation circuit includes an optocoupler and a diode, the two input ends of the optocoupler are configured to be connected to a diode, the first output end of the optocoupler is connected to the T1 end of the thyristor through a switch resistor, the second output end of the optocoupler is connected to the G end of the thyristor, and the G end of the thyristor is connected to the negative pole of the power supply after being connected to its T2 end through another switch resistor. For the specific circuit of this embodiment, see Figure 1 and Figure 5 shown.

[0023] like Figure 2-Figure 4 As shown, the first channel drive circuit (drive unit) is used as an example for explanation. The controller J1 (for example, the single-chip microcomputer STM32L010C6) outputs the drive signals DR+1 and DR-1, and the isolation resistor R5, the isolation resistor R6, the diode D1 and the optical coupler U1 form an isolated thyristor drive circuit to output the conduction thyristor voltage, which effectively isolates the controlled mains from the drive signal. The switch resistor R3, the switch resistor R4 and the bidirectional thyristor Q1 form a thyristor switch circuit, and the T1 and T2 ends of the bidirectional thyristor Q1 are connected to the load power supply circuit, and the conduction voltage is added to the thyristor G and T1 ends through the optical coupler U1, thereby conducting the power supply circuit, and realizing the conduction or disconnection of the power supply circuit of the controlled main load. The fuse FH1 protects the drive overcurrent caused by load short circuit or overload.

[0024] As mentioned above, thyristors and optocoupler isolation circuits are used to form at least one drive unit. The controller outputs a control signal to control the on and off of the thyristors through the optocoupler isolation circuit to achieve multi-channel PWM control temperature regulation.

[0025] Example 2

[0026] See also Figure 1-Figure 5 In this embodiment 2, a multi-channel temperature control driver further includes an absorption circuit, which is arranged between the negative output terminal of the load and the negative electrode of the power supply. Figure 1 and Figure 5 shown.

[0027] like Figure 2-Figure 4As shown, the first channel driving circuit is used as an example for explanation. The absorption resistor R1, the absorption capacitor C1 and the absorption capacitor C2 form an absorption circuit to absorb the peak voltage caused by the switch load.

[0028] Example 3

[0029] See also Figure 1-Figure 5 A multi-channel temperature control driver of this embodiment 3 further includes a varistor, and the varistor is connected between the positive input terminal of the load and the negative electrode of the power supply. Figure 1 and Figure 5 shown.

[0030] like Figure 2-Figure 4 As shown, the varistor RV1 absorbs the peak overvoltage of the system.

[0031] Example 4

[0032] See also Figure 1-Figure 5 A multi-channel temperature control driver of this embodiment 4 also includes a current transformer, the primary side of the current transformer is arranged on the positive input terminal and the negative output terminal of the load, and the signal output terminal of the current transformer is connected to the controller. For the specific circuit of this embodiment, see Figure 1 and Figure 5 shown.

[0033] like Figure 2-Figure 4 As shown, a heater as a load is connected between L1 - 1 and L1 - 2 , and a connecting wire passes through the primary side of the current transformer L1 for heater current detection.

[0034] As mentioned above, the utility model can realize a 12-channel temperature control heating driver with the characteristics of large driving current, small size, simple structure, and perfect protection. It can also provide a heater current transformer secondary current for a temperature control system that needs to detect the heater current.

[0035] It should be pointed out that the examples of the above-mentioned embodiments can be preferably combined with one or more of them according to actual needs, and multiple examples use a set of drawings to illustrate the combined technical features, which will not be described one by one here.

[0036] It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0037] The above description is a detailed description and illustration of the preferred feasible embodiments of the utility model, but these descriptions are not intended to limit the scope of protection required by the utility model. All equivalent changes or modified changes completed under the technical teachings suggested by the utility model should fall within the scope of patent protection covered by the utility model.

Claims

1. A multi-channel temperature control driver, characterized in that: It comprises a controller and at least one driving unit, wherein the driving unit comprises a thyristor and an optocoupler isolation circuit, wherein the T1 terminal and T2 terminal of the thyristor are connected to a power supply circuit of a load, the two input terminals of the optocoupler isolation circuit are connected to the controller, and the two output terminals of the optocoupler isolation circuit are respectively connected to the T1 terminal and the G terminal of the thyristor.

2. A multi-channel temperature control driver according to claim 1, characterized in that: The optocoupler isolation circuit includes an optocoupler and a diode, wherein two input ends of the optocoupler are configured to be connected with diodes, a first output end of the optocoupler is connected to the T1 end of the thyristor through a switch resistor, a second output end of the optocoupler is connected to the G end of the thyristor, and the G end of the thyristor is connected to the negative pole of the power supply after being connected to its T2 end through another switch resistor.

3. The multi-channel temperature control driver according to claim 1, characterized in that: It also includes a current transformer, the primary side of which is arranged on the positive input terminal and the negative output terminal of the load, and the signal output terminal of the current transformer is connected to the controller.

4. The multi-channel temperature control driver according to claim 1, characterized in that: It also includes an absorption circuit, which is arranged between the negative output terminal of the load and the negative electrode of the power supply; wherein the absorption circuit includes two absorption capacitors and an absorption resistor, and the absorption resistor and an absorption capacitor are connected in series and then connected in parallel with another absorption capacitor.

5. The multi-channel temperature control driver according to claim 1, characterized in that: The device also includes a varistor, which is connected between the positive input terminal of the load and the negative electrode of the power supply.

6. The multi-channel temperature control driver according to claim 1, characterized in that: The utility model also comprises a fuse, which is arranged on the power supply circuit.

7. The multi-channel temperature control driver according to claim 1, characterized in that: The thyristors are bidirectional thyristors, and the number of driving units is 12 groups.

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