control device
The control device addresses the issue of multiple boards for different AC voltages by using a smoothing circuit and high-voltage power supply to convert AC230V and AC24V to DC30V, enabling a single board to handle both voltages efficiently.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- MITSUBISHI ELECTRIC CORP
- Filing Date
- 2024-10-31
- Publication Date
- 2026-05-18
AI Technical Summary
Existing control devices require separate circuit boards for different AC power supply voltage inputs, such as AC230V and AC24V, leading to the need for multiple power supply and control boards due to differing circuit configurations.
A control device with a first board that includes a smoothing circuit to convert AC24V to DC30V and a second board with a high-voltage power supply circuit to step down AC230V to DC30V, allowing a single power supply and control board to handle both voltages, and a relay unit to switch between DC voltages.
Enables a single power supply and control board to manage multiple AC power supply voltage inputs, reducing the need for multiple boards and enhancing flexibility in handling different voltage inputs.
Smart Images
Figure 2026080097000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a control device having a first substrate and a second substrate and controlling a device to be controlled.
Background Art
[0002] In Patent Document 1, a plurality of different low voltages are generated step by step from a high AC voltage. Specifically, a switching power supply board inputs commercial AC power (AC100V - AC240V) having a high AC voltage and outputs a driving voltage of DC24V and a standby voltage of DC5.4V. An inverter board inputs the driving voltage of DC24V and outputs an AC voltage of 1 - 2kV. A logic board inputs the driving voltage of DC24V, performs DC - DC conversion, and outputs DC voltages of 12V and 13V.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In Patent Document 1, the AC voltage input to the device was limited because it generated lower AC and DC voltages in stages from high AC voltages (AC100V to AC240V). For example, a device designed for AC240V input could not handle AC24V input. To accommodate both AC240V and AC24V input voltages, it was necessary to develop two or more completely different circuit boards suited to each input voltage. For example, if the power supply and control sections were on separate boards, two types of power supply boards (one for AC230V input and one for AC24V input) and one type of control board would be required. Furthermore, if the power supply and control boards were combined into a single power control board, there would be two types of power control boards (one for AC230V input and one for AC24V input). However, since the circuit configurations of the power supply circuit components for AC230V input and AC24V input are completely different, it would be necessary to develop two significantly different power control boards.
[0005] This disclosure has been made in view of the above, and aims to provide a control device that can handle multiple different AC power supply voltage inputs with a single type of power supply board and control board. [Means for solving the problem]
[0006] To solve the above-mentioned problems and achieve the objective, the control device of this disclosure comprises a first board having a controlled circuit that controls various operations of a controlled device and a smoothing circuit that smooths an input first AC power supply voltage to generate a first DC voltage, and a second board having a high-voltage power supply circuit that steps down a second AC power supply voltage higher than the first AC power supply voltage to a second DC voltage having the same voltage value as the first DC voltage, and a relay unit that relays the second DC voltage to the first board. The first board includes a supply circuit that supplies a third DC voltage, which is a DC voltage generated based on either the first DC voltage from the smoothing circuit unit or the second DC voltage from the relay unit, to the controlled circuit. [Effects of the Invention]
[0007] This disclosure has the effect of enabling a single power supply board and control board to handle multiple different AC power supply voltage inputs. [Brief explanation of the drawing]
[0008] [Figure 1] Block diagram showing the configuration of the control device according to Embodiment 1 [Figure 2] Flowchart showing the operation of the control device according to Embodiment 1 [Figure 3] Block diagram showing the configuration of the control device according to Embodiment 2 [Figure 4] In Embodiment 2, this figure shows whether the AC24V actuator circuit can be used for two AC voltages and the setting configuration of the switch. [Figure 5] Block diagram showing the configuration of the control device according to Embodiment 3 [Figure 6] Block diagram showing the configuration of the control device according to Embodiment 4 [Modes for carrying out the invention]
[0009] The control device according to the embodiment will be described in detail below with reference to the drawings.
[0010] Embodiment 1. Figure 1 is a block diagram showing the configuration of a control device according to Embodiment 1. In Figure 1, the control device 101 comprises a power supply board 111 as a second board, a control board 121 as a first board, and a cable 120. The cable 120 electrically connects the power supply board 111 and the control board 121. The control device 101 drives and controls various operations of a controlled device (not shown).
[0011] The power supply board 111 includes a high-voltage terminal block 112, a high-voltage power supply circuit section 113, and a power connector 114 as a relay section. The high-voltage terminal block 112 connects to a power line 10 of AC230V as a second AC power supply voltage. The second AC power supply voltage is, for example, any AC voltage between -10% or more of 220V and +10% or less of 240V, i.e., between 198V and 264V. The high-voltage power supply circuit section 113 steps down the AC230V AC power supply voltage input from the high-voltage terminal block 112 to a DC voltage of DC30V as a second DC voltage. The second DC voltage is lower than the second AC power supply voltage, higher than the first AC power supply voltage (described later), and the same DC voltage as the first DC voltage (described later). The power connector 114 is connected to the cable 120 and supplies the DC30V DC voltage input from the high-voltage power supply circuit section 113 to the control board 121.
[0012] The control board 121 includes a low-voltage terminal block 122, a smoothing circuit section 123, a control connector 124, a low-voltage power supply circuit section 125 as a supply circuit section, and a controlled-control unit 126. The controlled-control unit 126 has multiple control circuit sections, and these multiple control circuit sections control various operations of the controlled device on which the control board 121 is mounted. Examples of control circuit sections include a microcomputer, a communication section, and a display section.
[0013] The low-voltage terminal block 122 connects to the AC24V power line 20, which is the first AC power supply voltage. The first AC power supply voltage is lower than the second AC power supply voltage. The first AC power supply voltage is any AC voltage between 20.4V and 27.6V, within 24V ± 15%. The control connector 124 is connected to the cable 120, which receives a DC30V DC voltage from the power supply board 111. The smoothing circuit 123 smooths the AC24V AC voltage input from the low-voltage terminal block 122 to generate a DC30V DC voltage, which is the first DC voltage. As mentioned above, the first DC voltage is equal to the second DC voltage.
[0014] The low-voltage power supply circuit 125 receives a DC 30V DC voltage input from the power supply board 111 via the control connector 124, and a DC 30V DC voltage input from the smoothing circuit 123. The low-voltage power supply circuit 125 uses either the DC 30V DC voltage input from the power supply board 111 or the DC 30V DC voltage input from the smoothing circuit 123 to generate a third DC voltage, which is any one or more DC voltages used by the controlled circuit 126. For example, the low-voltage power supply circuit 125 performs a step-down operation to generate a DC 13V DC voltage. The low-voltage power supply circuit 125 outputs the generated DC 13V DC voltage to the controlled circuit 126.
[0015] Next, the operation of the control device 101 will be described. Figure 2 is a flowchart showing the operation of the control device 101 according to Embodiment 1. In Embodiment 1, either the AC230V power line 10 or the AC24V power line 20 is connected to the control device 101.
[0016] First, we will describe the operation in the case where the AC230V power line 10 is connected to the power board 111 of the control device 101, and AC230V is input to the control device 101. In this case, the AC230V route in step S10 is selected. In this case, the AC230V power line 10 is connected to the high-voltage terminal block 112 (step S12). The AC230V power supply voltage is input to the high-voltage terminal block 112 located inside the power board 111 via the power line 10. The high-voltage power supply circuit 113 steps down the AC230V power supply voltage input from the high-voltage terminal block 112 to DC30V (step S13). The stepped-down DC30V voltage is input to the control connector 124 of the control board 121 via the power connector 114 and cable 120 (step S14). The control connector 124 supplies the DC30V voltage to the low-voltage power supply circuit 125. The low-voltage power supply circuit 125 steps down the DC 30V DC voltage input from the control connector 124 to a third DC voltage, which is any one or more DC voltages used by the controlled circuit 126 (step S17). The stepped-down third DC voltage is supplied to the controlled circuit 126.
[0017] Next, the operation in the case where the power line 20 of AC 24V is connected to the control device 101 and AC 24V is input to the control board 121 of the control device 101 will be described. In this case, the route on the AC 24V side in step S10 is selected. In this case, the power supply board 111 and the cable 120 are unnecessary. In this case, the power line 20 of AC 24V is connected to the low-voltage terminal block 122 (step S15). The power supply voltage of AC 24V is input from the low-voltage terminal block 122 arranged in the control board 121. The smoothing circuit section 123 smooths the power supply voltage of AC 24V and converts it into a DC voltage of DC 30V (step S16). The smoothing circuit section 123 supplies the voltage of DC 30V to the low-voltage power supply circuit section 125. The low-voltage power supply circuit section 125 steps down the DC voltage of DC 30V input from the smoothing circuit section 123 to a third DC voltage which is any one or more DC voltages used by the controlled circuit 126 (step S17). The stepped-down third DC voltage is supplied to the controlled circuit 126.
[0018] As described above, according to the first embodiment, by connecting the power line 10 of AC 230V to the power supply board 111, it is possible to cope with the input voltage of AC 230V as the second AC power supply voltage, and by connecting the power line 20 of AC 24V to the control board 121, it is possible to cope with the input voltage of AC 24V as the first AC power supply voltage. For both the input voltages of AC 24V as the first AC power supply voltage and AC 230V as the second AC power supply voltage, one type of power supply board 111 and control board 121 can be used to cope with them.
[0019] Second Embodiment. In the first embodiment, for a plurality of AC voltages, one type of power supply board 111 and one type of control board 121 are used to cope with them, and the controlled circuit 126 is configured to be able to operate. In the second embodiment, by adding an AC 24V actuator circuit 131 and a switch 132, it is possible to cope with a load (not shown) which is a control target device driven by using the voltage of AC 24V as the first AC power supply voltage as a power source.
[0020] FIG. 3 is a block diagram showing the configuration of the control device according to Embodiment 2. FIG. 4 is a diagram showing the availability of the AC24V actuator circuit 131 and the setting mode of the switch 132 for two AC voltages in Embodiment 2.
[0021] The AC24V actuator circuit 131 is a circuit that drives a load (not shown), which is a controlled device powered by an AC24V voltage, and operates using the AC24V AC voltage input from the low-voltage terminal block 122 as a power source as it is.
[0022] The switch 132 selects the use or non-use of the smoothing circuit section 123 according to the AC voltage (AC230V / AC24V) input to the control device 101. The switch 132 is a switch whose switching state is set by the user of the control device 101, the installation person, or the like. When only AC230V is input to the control device 101, the switch 132 sets the smoothing circuit section 123 to the non-use state, that is, the inoperable state. When only AC24V is input to the control device 101, the switch 132 sets the smoothing circuit section 123 to the use state, that is, the operable state. When both AC24V and AC230V are input to the control device 101, the switch 132 may be set to either the use or non-use state of the smoothing circuit section 123, that is, either the operable state or the inoperable state. When the smoothing circuit section 123 is in the use state, that is, the operable state, the low-voltage power supply circuit section 125 can use both the DC30V DC voltage input from the control connector 124 and the DC30V DC voltage input from the smoothing circuit section 123. When the smoothing circuit section 123 is in the non-use state, that is, the inoperable state, the low-voltage power supply circuit section 125 can use only the DC30V DC voltage input from the control connector 124.
[0023] If only AC230V is input, the AC24V actuator circuit 131 cannot be driven, and the switch 132 sets the smoothing circuit 123 to a non-operational state. In this case, as described above, AC230V is input to the control connector 124 of the control board 121 via the high-voltage terminal block 112, high-voltage power circuit 113, power connector 114 of the power supply board 111 and cable 120, and is stepped down to a third DC voltage by the low-voltage power circuit 125 and supplied to the controlled circuit 126.
[0024] When only AC24V is input, the AC24V actuator circuit 131 operates using the AC24V AC voltage input from the low-voltage terminal block 122 as its power source. In other words, in this case, the AC24V actuator circuit 131 is usable. When only AC24V is input, the switch 132 is set to use the smoothing circuit unit 123, i.e., to an operable state. Therefore, in this case, the smoothing circuit unit 123 smooths the AC24V AC voltage input from the low-voltage terminal block 122 to generate a DC voltage of DC30V as the first DC voltage and inputs it to the low-voltage power supply circuit unit 125. The low-voltage power supply circuit unit 125 steps down the DC30V DC voltage input from the smoothing circuit unit 123 to any DC voltage to be used by the controlled circuit 126, and supplies the stepped-down DC voltage to the controlled circuit 126. Therefore, when only AC24V is input, it is possible to operate the AC24V actuator circuit 131 and the low-voltage power supply circuit 125 simultaneously.
[0025] When both AC230V and AC24V are input, the AC24V actuator circuit 131 operates using the AC24V AC voltage input from the low-voltage terminal block 122 as its power source. In other words, in this case, the AC24V actuator circuit 131 is usable. When both AC230V and AC24V are input, the switch 132 may be set to either use or not use the smoothing circuit 123, i.e., to an operational or inoperable state, as described above. When the smoothing circuit 123 is used, i.e., in an operational state, the low-voltage power supply circuit 125 can use both the DC30V DC voltage input from the control connector 124 and the DC30V DC voltage input from the smoothing circuit 123. When the smoothing circuit 123 is not used, i.e., in an inoperable state, the low-voltage power supply circuit 125 can use only the DC30V DC voltage input from the control connector 124. Thus, when using both AC230V and AC24V, by setting switch 132 to off and setting the step-down voltage of the high-voltage power supply circuit 113, which receives AC230V, to higher than DC30V, it becomes possible to drive the low-voltage power supply circuit 125 with a higher drive voltage, enabling it to handle loads that use more power. In other words, the drive voltage of the low-voltage power supply circuit 125 is generated from AC230V, and the drive voltage of the AC24V actuator circuit 131 uses AC24V.
[0026] As described above, according to Embodiment 2, by providing the AC24V actuator circuit 131, it is possible to handle loads driven by AC24V as a power source. Furthermore, by providing the switch 132, it is possible to select whether to use AC230V or AC24V as the power source for the control device 101.
[0027] Embodiment 3. In Embodiment 2, the AC24V actuator circuit 131 cannot be used if there is no AC24V as the first AC power supply voltage. In Embodiment 3, by using a step-down transformer 102, the AC24V actuator circuit 131 can be used even when there is no AC24V.
[0028] Figure 5 is a block diagram showing the configuration of the control device 101 according to Embodiment 3. In Embodiment 3, compared to the configuration of Embodiment 1 shown in Figure 1, an AC24V actuator circuit 131 is added to the control board 121, and a step-down transformer 102 is added between the power supply board 111 and the control board 121. Also, since a case without AC24V is assumed, the low-voltage terminal block 122 and the smoothing circuit section 123 are removed from the configuration of Embodiment 1 shown in Figure 1.
[0029] The step-down transformer 102 steps down the AC230V, which is the second AC power supply voltage input to the high-voltage terminal block 112, to AC24V, which is the first AC power supply voltage. The AC24V actuator circuit 131 uses the AC24V input from the step-down transformer 102 via the cable 130 as its power source. The AC24V actuator circuit 131 drives a load (not shown), which is a controlled device that uses AC24V as its power source.
[0030] As described above, according to Embodiment 3, since a step-down transformer 102 is provided, the AC24V actuator circuit 131 can be used even when AC24V is unavailable, and a load, which is a controlled device that uses AC24V as its power source, can be driven.
[0031] Embodiment 4. In Embodiment 3, household power is assumed to be AC230V. In Embodiment 4, the control device 101 can be used as part of the air conditioning system by using the AC200V power supply for the indoor and outdoor communication of the outdoor unit of the air conditioner. The other configurations are the same as in Embodiment 3.
[0032] Figure 6 is a block diagram showing the configuration of the control device 101 according to Embodiment 4. The outdoor unit of the air conditioner 201 is equipped with an internal / external communication terminal block 211. In Embodiment 4, the high-voltage terminal block 112 of Embodiment 3 is replaced with an internal / external communication terminal block 115. The internal / external communication terminal block 115 of the power supply board 111 is connected to the internal / external communication terminal block 211 of the air conditioner 201 via a cable 140. In Embodiment 4, AC200V AC power is supplied from the internal / external communication terminal block 211 of the air conditioner 201 to the internal / external communication terminal block 115 of the power supply board 111.
[0033] The AC200V AC power input to the internal / external communication terminal block 115 of the power supply board 111 is stepped down to AC24V by the step-down transformer 102 and then supplied to the AC24V actuator circuit 131 via the cable 130. The AC200V AC power input to the internal / external communication terminal block 115 of the power supply board 111 is also stepped down to DC30V DC voltage by the high-voltage power supply circuit section 113 and then input to the low-voltage power supply circuit section 125 via the power connector 114, cable 120, and control connector 124.
[0034] As described above, according to Embodiment 4, by using the internal / external communication terminal block 115, the AC200V power supply for internal / external communication of the air conditioner 201 can be used by the control device 101, and the control device 101 can be used as part of the air conditioning system.
[0035] The configurations shown in the embodiments described above are merely examples of the content of this disclosure, and can be combined with other known technologies, combined with other embodiments, and some parts of the configuration can be omitted or modified without departing from the gist of this disclosure. [Explanation of symbols]
[0036] 10,20 Power lines, 101 Control device, 102 Step-down transformer, 111 Power supply board, 112 High-voltage terminal block, 113 High-voltage power supply circuit section, 114 Power connector, 115,211 Internal / external communication terminal block, 120,130,140 Cables, 121 Control board, 122 Low-voltage terminal block, 123 Smoothing circuit section, 124 Control connector, 125 Low-voltage power supply circuit section, 126 Controlled circuit, 131 AC24V actuator circuit, 132 Switch, 201 Air conditioner.
Claims
1. A first circuit board having a control circuit that controls various operations of a controlled device, and a smoothing circuit that smooths the input first AC power supply voltage to generate a first DC voltage, A second substrate having a high-voltage power supply circuit section that steps down a second AC power supply voltage higher than the first AC power supply voltage to a second DC voltage that has the same voltage value as the first DC voltage, and a relay section that relays the second DC voltage to the first substrate, Equipped with, The first substrate is A control device comprising a supply circuit unit that supplies a third DC voltage, which is a DC voltage generated based on either the first DC voltage from the smoothing circuit unit or the second DC voltage from the relay unit, to the control unit.
2. The control device according to claim 1, wherein the first circuit board is provided with an actuator circuit that takes the first AC power supply voltage as input and drives the controlled device with the first AC power supply voltage.
3. The first substrate includes a switch to toggle whether or not to operate the smoothing circuit section. When the switch is set to operate the smoothing circuit, the actuator circuit is driven by the first AC power supply voltage, and the supply circuit generates the third DC voltage based on the first DC voltage from the smoothing circuit. The control device according to claim 2, wherein when the smoothing circuit is set to non-operation by the switch, the supply circuit generates the third DC voltage based on the second DC voltage from the relay unit.
4. A first circuit board having a control circuit that controls various operations of a controlled device, A second board having a high-voltage power supply circuit section that steps down the AC power supply voltage to a DC voltage, and a relay section that relays the DC voltage to the first board, A step-down transformer that reduces the AC power supply voltage to generate an AC voltage, Equipped with, The first substrate is, A supply circuit unit that supplies a DC voltage generated based on the DC voltage supplied from the relay unit to the control unit, A control device comprising: an actuator circuit that takes an AC voltage supplied from the step-down transformer as input and drives the controlled device with the AC voltage.
5. The control device according to claim 4, wherein the second circuit board is provided with an internal / external communication terminal block to which the AC power supply voltage from the air conditioner is input.