CN210680402U - Load control circuit, load control module and electrical control box - Google Patents
Load control circuit, load control module and electrical control box Download PDFInfo
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- CN210680402U CN210680402U CN201921103181.5U CN201921103181U CN210680402U CN 210680402 U CN210680402 U CN 210680402U CN 201921103181 U CN201921103181 U CN 201921103181U CN 210680402 U CN210680402 U CN 210680402U
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Abstract
A load control circuit comprises a current power switch, a current detection module and a control module, wherein the current detection module is used for detecting the current of a load end of the current power switch and outputting a first signal related to the current of the load end, and the control module is used for receiving the first signal; when the load end of the current power switch needs to be disconnected, the control module outputs a second signal, the control end of the current power switch responds to the second signal to disconnect the load end of the current power switch, and the condition that the current of the load end corresponding to the first signal is larger than or equal to the set cut-off current is included when the load end of the current power switch needs to be disconnected. The maintenance times can be reduced on the basis of realizing load circuit control and current overload protection. A load control module comprises a control switch assembly and a control module assembly. It is easy to maintain. An electrical control box comprises a shell, a heat conducting piece and a load control module, wherein the shell is provided with a heat dissipation part, and the heat conducting piece is fixed in the shell and is in heat conduction connection with the heat dissipation part. The heat dissipation is good.
Description
Technical Field
The utility model relates to a load control technical field, concretely relates to load control circuit, load control module group.
The utility model discloses still relate to electric box technical field, concretely relates to electrical control box.
Background
The running condition of the automobile or other vehicles is severe, and factors of shock resistance, water resistance and convenience in maintenance need to be considered when the electric control box is designed. The electric equipment of the electric-driven new energy automobile also comprises high-current type low-voltage direct-current electric equipment, and in the technical field of automobile electric appliance control, the current I is more than or equal to 30A and is called high current, and the current I is less than 30A and is called low current.
In the prior art, more than one relay KM is adopted to realize on-off control of a load circuit, and in order to protect load equipment, a fuse FU is also required to be connected in series in the load circuit. Referring to fig. 1, the rated current of the load device is larger than the load current of the relay KM1, and a multistage amplification driving circuit is constructed by using more than two relays, specifically: the relay KM1 and the relay KM2 both select normally open relays, a coil of the relay KM1 is electrically connected with a control pin KM1_ ctrl in series to form a first-stage control circuit, a load end of the relay KM1, a coil of the relay KM2 and a control pin KM2_ ctrl are electrically connected with each other in series to form a second-stage control circuit, a load end of the relay KM2 is connected in series in the load circuit, and a fuse FU is also connected in series in the load circuit. Thus, when the control pin KM1_ ctrl and the control pin KM2_ ctrl both send out a high level, the load circuit is turned on; when at least one of the control pins KM1_ ctrl and KM2_ ctrl sends out a low level, the load circuit is disconnected, so that the condition control of the load equipment is realized. When the current of the load circuit reaches the overload fusing current of the fuse FU, the fuse FU fuses, the load circuit is disconnected, and overload protection of the load device is achieved.
In an electrical control box of a new energy automobile, overload fusing currents of common high-power fuses are 30A, 180A, 300A and the like. However, the fuse is handled against the current overload by breaking the circuit by blowing the fuse wire, and the overload protection function is disposable.
A thermal overload relay, also called a thermal relay, is an overload relay which applies the principle of current thermal effect and takes an electrical thermosensitive bimetallic strip as a sensitive element. The electric thermosensitive bimetal sheet is made of two kinds of alloy with relatively great linear expansion coefficient difference through heating and rolling. When heated, the bimetallic strip bends from the high expansion layer (active layer) to the low expansion layer (passive layer). When the current is too large (exceeds the setting value), the element acts due to 'heat', and the linked break contact cuts off the power supply of the controlled circuit and the protected equipment. Thermal overload relays are designed for ac circuit overload protection and their overload currents are not adjustable in relation to the electrician's thermally sensitive bimetallic strip.
SUMMERY OF THE UTILITY MODEL
The utility model discloses one of the technical problem who solves reduces load control circuit and maintains the number of times on realizing load equipment control and load current overload protection's basis simultaneously, for this, the utility model provides a load control circuit, load control module group.
The second technical problem to be solved of the utility model is how to discharge the heat that how faster distributes the electric elements in the airtight space, for this, the utility model provides an electrical control box.
In order to solve the technical problem, the utility model adopts the following technical scheme:
designing a load control circuit, which comprises a current power switch, a current detection module and a control module, wherein the current detection module is used for detecting the current of a load end of the current power switch and outputting a first signal related to the current of the load end, and the control module is used for receiving the first signal; when the load end of the current power switch needs to be disconnected, the control module outputs a second signal, the control end of the current power switch responds to the second signal to disconnect the load end of the current power switch, and the condition that the current of the load end corresponding to the first signal is larger than or equal to the set cut-off current is included when the load end of the current power switch needs to be disconnected.
Wherein, the current power switch refers to a direct current power switch. The current power switch can be a low-voltage direct-current power switch, and the low-voltage direct-current power refers to that the load power voltage is less than or equal to 36 VDC. The current power switch can be a heavy current power switch, and the heavy current means that the load current is more than or equal to 30A. The current power switch can be a high-current type low-voltage direct-current power switch, the high-current type low-voltage direct-current power switch means that the load power voltage is less than or equal to 36VDC, and the load current is more than or equal to 30A.
Preferably, the current power switch is a current power switch having a current sensing element, the current sensing element is used for detecting a current at a load end of the current power switch, and a signal pin electrically connected to the current sensing element is formed on the current power switch.
Preferably, the current power switch comprises an intelligent hessian high-current power switch. The BTS555 type High-Current Power Switch is an intelligent seaspeed High-Current Power Switch (Smart High-Current Power Switch) and has an Overload protection Current limit Short circuit protection function.
Further, the current power switch is a field effect transistor.
The electric control box comprises a shell, a heat conducting piece and the load control circuit, wherein the shell is provided with a heat radiating part, and the heat conducting piece is fixed in the shell and is in heat conduction connection with the heat radiating part.
Designing a load control module which comprises a control switch component and a control module component; the control switch assembly comprises a control switch base and a current power switch, wherein the control switch base comprises a load input conductive bar and a load output conductive bar, the current power switch comprises a load input pin, a load output pin, a control input pin and a signal output pin related to the current of a load end of the control input pin, the load input pin is electrically connected with the load input conductive bar, and the load output pin is electrically connected with the load output conductive bar; the control module comprises a control module base and a controller, the control module base is detachably connected with the control switch base, the controller is installed on the control module base, the controller is provided with a signal input pin and a control output pin, the signal output pin is detachably and electrically connected with the signal input pin, and the control output pin is detachably and electrically connected with the control input pin.
Preferably, the control switch base further comprises a first insulating base and a power PCB, wherein the load input conducting bar and the load output conducting bar are detachably connected with the first insulating base respectively, the load input conducting bar is fixedly connected to the power PCB and passes through a wire on the power PCB to be electrically connected with a corresponding load input pin, or the load output conducting bar is fixedly connected to the power PCB and passes through a wire on the power PCB to be electrically connected with a corresponding load output pin.
Further, the first insulating seat includes the connector mounting hole, the control module base still includes the connector, the contact pin of connector with the power strip electricity is connected to the load output, the connector is installed in the connector mounting hole.
Preferably, the control module base further comprises a second insulating base and a signal PCB board; the controller is detachably connected with the second insulating base, the signal output pin and the control input pin are respectively and fixedly connected with the signal PCB, and the signal input pin and the control output pin are respectively and detachably and electrically connected with the signal PCB and are electrically connected with the corresponding signal output pin and the corresponding control input pin through wires on the signal PCB.
Preferably, the control switch base further includes a first insulating base, the control module base further includes a second insulating base, the second insulating base is a housing, and the first insulating base is connected to the second insulating base in a sealing manner.
The electric control box comprises a shell, a heat conducting piece and the load control module, wherein the shell is provided with a heat radiating part, and the heat conducting piece is fixed in the shell and is in heat conduction connection with the heat radiating part.
The utility model discloses a main beneficial technological effect includes:
(1) the load control circuit has a load control function and a current overload protection function. In the load control function, compared with a current overload fuse, the load control circuit adopts the current power switch in the current overload protection function, so that the normal use of the current power switch can be not damaged on the basis of realizing the current overload protection, and the maintenance frequency of devices can be reduced.
(2) The intelligent Hisex high-current power switch has no contact and long service life; compared with a relay type power switch, the power switch occupies a small space.
(3) The set cutoff current can be adjusted without replacing the device.
(4) The load control module is convenient to maintain and replace.
(5) The load input conductive bar and the load output conductive bar have larger exposed metal surfaces, and the heat dissipation effect on the current power switch is good.
(6) The electric control box has good heat dissipation and can reduce the influence of heat on the working stability and the service life of the load control circuit.
Drawings
Fig. 1 is a circuit diagram of a load control circuit in the prior art.
Fig. 2 is a circuit diagram of a load control circuit according to the present invention.
Fig. 3 is a block diagram of a BTS555 type large current power switch in the prior art.
Fig. 4 is a structural diagram of a load control module according to the present invention.
Fig. 5 is an exploded view of fig. 4.
Fig. 6 is a structural diagram of another load control module according to the present invention.
Fig. 7 is an exploded view of fig. 6.
Fig. 8 is an exploded view of another load control module according to the present invention.
Fig. 9 is an exploded view of an electrical control box according to the present invention.
IN the figure, 11-bottom shell, 12-top cover, 121-heat dissipation fin, 13-heat conducting part, 2-load control module, 20-control switch component, 2011-first insulating seat, 20111-fixing stud, 20112-fixing stud, 20113-curved surface seal, 20114-connector mounting hole, 2012-load input conducting bar, 2013-power PCB board, 2014-load output conducting bar, 2015-connector, 20151-pin, 2016-adapter, 202-current power switch, 2020-fixing hole, 2021-load output pin OUT, 2022-control input pin IN, 2023-load input pin VBB, 2024-signal output pin IS, 2025-load output pin OUT, 21-control module component, 2111-second insulating seat, 21111-controller plug socket, 21112-controller plug socket, 21113-signal lamp light-transmitting part, 21114-protective cover, 21115-card slot, 2112-signal PCB, 21121-control PCB, 21122-communication PCB, 213-controller sheath, 2131-bottom shell, 2132-top cover, 31-control module and 32-current detection module.
Detailed Description
The following embodiments are only intended to illustrate the present invention in detail, and do not limit the scope of the present invention in any way.
In the prior art, the detachable connection of the physical structure is realized by bolt connection and clamping connection, and the detachable connection of the circuit is electrically connected with conductive contact and plug-in connection.
Example 1: a load control circuit, see fig. 2-3, includes a current power switch Q1, a current detection module 32, and a control module 31, where the current detection module 32 is configured to detect a load-side current of the current power switch Q1 and output a first signal related to the load-side current, and the control module 31 is configured to receive the first signal; when the load terminal of the current source switch Q1 needs to be disconnected, the control module 31 outputs a second signal, the control terminal of the current source switch Q1 responds to the second signal to disconnect the load terminal of the current source switch Q1, and the condition that the load terminal of the current source switch Q1 needs to be disconnected includes that the load terminal current corresponding to the first signal is not less than the set cut-off current, and also includes the condition that the load terminal needs to be disconnected under other conditions.
Wherein, the current power switch refers to a direct current power switch. The current power switch can be a low-voltage direct-current power switch, and the low-voltage direct-current power refers to that the load power voltage is less than or equal to 36 VDC. The current power switch can be a heavy current power switch, and the heavy current means that the load current is more than or equal to 30A. The current power switch can be a high-current type low-voltage direct-current power switch, the high-current type low-voltage direct-current power switch means that the load power voltage is less than or equal to 36VDC, and the load current is more than or equal to 30A.
Preferably, the current source switch Q1 is a current source switch having a current sensing element for detecting a load-side current of the current source switch, and a signal pin electrically connected to the current sensing element is formed on the current source switch Q1.
Further, the current power switch comprises an intelligent hessian high-current power switch. The BTS555 type High-Current Power Switch is an intelligent seaspeed High-Current Power Switch (Smart High-Current Power Switch) and has an Overload protection Current limit Short circuit protection function.
Referring to fig. 1, the power switch Q1 selects a BTS555 type large current power switch, and the on current V _ on of the control input pin thereof is 15VDC, so that the photocoupler TLP521-1 is required to modulate the control output signal Q1_ ctrl into a signal with a high level greater than or equal to 15VDC and a signal with a low level less than 15VDC, and the signal output pin thereof outputs a current signal related to the load end current thereof and is required to be modulated into an analog signal corresponding to the load end current, so that the analog signal can be received by the a/D converter by using a current sampling circuit. In fig. 2, the control output signal Q1_ ctrl may be a GPIO pin of the MCU, and the a/D should be connected to an ADC function pin of the MCU, or electrically connected to an analog input pin of the a/D converter, and a digital output pin of the a/D converter is electrically connected to the GPIO pin of the MCU. In the figure, AVDD needs to be consistent with the reference voltage of the a/D converter.
Example 2: a load control module, see fig. 4-5, comprises a control switch assembly 20 and a control module assembly 21.
The control switch assembly 20 includes a control switch base, a current power switch 202, the control switch base includes a load input conductive bar 2012 and a load output conductive bar 2013, the current power switch 202 includes a load input pin 2023, a load output pin 2021, a load output pin 2025, a control input pin 2022 and a signal output pin 2024 related to the current of the load terminal, the load input pin 2023 is electrically connected to the load input conductive bar 2012, and the load output pin 2021 is electrically connected to the load output pin 2025 in short circuit and electrically connected to the load output conductive bar 2014. In this embodiment, the current power switch 202 is fixed to the load input conductive bar 2012, and specifically, the fixing hole 2020 of the current power switch 202 is riveted or bolted to the load input conductive bar 2012.
Alternatively, the control switch base further includes a first insulating base 2011, and a power PCB 2013, and the load input conductive bar 2012 is detachably connected to the first insulating base, for example, by a bolt. The load input conductive bar 2012 is fixedly connected to the power PCB 2013 and is electrically connected to the corresponding load input pin 2020 through a wire of the power PCB 2013. The load output conductive bar 2014 is fixedly connected to the power PCB 2013 and electrically connected to the corresponding load output pin through a wire of the power PCB 2013.
Still alternatively, referring to fig. 5, the control switch base further includes a first insulating base 2011 to which the load input conductive bar 2012 is detachably connected, e.g., bolted, and a power PCB 2013. The load input pin 2020 of the load input conductive bar 2012 is fixed and conductively connected. The load output conductive bar 2014 is fixedly connected to the power PCB 2013 and electrically connected to the corresponding load output pin through a wire of the power PCB 2013.
The control module assembly 21 comprises a control module base and a controller, the control module base is detachably connected with the control switch base, the controller is installed on the control module base, the controller is provided with a signal input pin and a control output pin, the signal output pin is detachably and electrically connected with the signal input pin, and the control input pin is detachably and electrically connected with the control output pin.
Alternatively, referring to fig. 7, the control module base includes a second insulator seat 2111, a signal PCB board 2112; the controller is detachably connected with the second insulating seat 2111, the signal output pin is fixed and electrically connected with the signal PCB board 2112, and the signal input pin is detachably and electrically connected with the signal PCB board 2112 and electrically connected with the corresponding signal output pin through a lead on the signal PCB board 2112; the control input pin is fixed and electrically connected with the signal PCB board 2112, and the control output pin is detachably and electrically connected with the signal PCB board 2112 and electrically connected with the corresponding control input pin through a lead on the signal PCB board 2112.
In fig. 5, the second insulating seat 2111 is provided with a slot 21115, the power PCB 2013 has a protrusion matching with the slot 21115, and since the power PCB 2013 is detachably connected with the load input conductive bar 2012, the load output conductive bar 2014 and the first insulating seat 2011 to form a whole, when the protrusion of the power PCB 2013 is inserted into the slot of the second insulating seat 2111, the second insulating seat 2111 is detachably fixed with the control switch base. In this embodiment, the second insulating seat 2111 is a housing, the signal PCB 2112 is disposed in the housing, and the signal PCB 2112 is further welded to the control input pin and the signal output pin of the current power switch 202. The second insulating seat 2111 is provided with a controller inserting seat 21111 and a signal lamp light transmission part, referring to fig. 5, the controller is installed in the controller sheath 213, and the controller sheath 213 is inserted in the controller inserting seat 21111 and is connected with the second insulating seat 2111 in a buckling manner. The controller boot 213 includes a snap-fit bottom shell 2131 and a top cover 2132. In other embodiments, the outer surface of the controller 213 may also be provided with a snap fit that mates with the controller socket 21111. The signal lamp light-transmitting portion 21111 mainly indicates a light-emitting state of the lamp for observing a state on the signal PCB 2112.
Preferably, the signal PCB 2112 includes a control PCB 21121 and a communication PCB 21122, and the control PCB 2112 is mainly used for laying and connecting wires of the control input pin and the control output pin; the communication PCB 21122 is mainly used for wiring the wires connecting the signal output pins and the signal input pins.
The communication PCB 21122 may be connected to a communication network, for example, when the load control module is installed in a car, the communication PCB 21122 may be connected to a CAN bus of a main control module of the car.
Example 3: a load control module, see fig. 6-7, comprises a control switch assembly 20 and a control module assembly 21. As a further improvement to embodiment 1, the following technical features are added in this embodiment:
further, referring to fig. 7, the first insulating base 2011 includes a connector mounting hole 20114, the control module base further includes a connector 2015, the pin 20151 of the connector 2015 is electrically connected to the load output conducting bar 2014, and the connector 2015 is mounted in the connector mounting hole 20114.
Further, referring to fig. 8, the control switch base further includes a first insulating seat 2011, the control module base further includes a second insulating seat 2111, the second insulating seat 2111 is a housing, and the first insulating seat 2011 is connected to the second insulating seat 2111 in a sealing manner.
Example 4: an electrical control box, see fig. 9, comprises a housing 1, a load control circuit 2 and a heat conducting member 13, wherein the housing 1 is formed by detachably connecting a bottom shell 11 and a top cover 12, the housing 1 has a heat dissipating portion, in this embodiment, the top cover 12 is made of a heat dissipating material, specifically, an aluminum structural member, and the heat conducting member 13 is fixed in the housing 1 and is in heat-conducting connection with the heat dissipating portion. In this embodiment, heat sink 13 is an "Contraband" shaped aluminum structure, the bottom surface of the "Contraband" shaped aluminum structure is bolted to the bottom housing, and top cover 12 is bolted to the top surface of the "Contraband" shaped aluminum structure. Since the heat conducting member 13 is an aluminum structural member, it is also capable of conducting electricity, and it should be noted that there is insulation between it and other electrical components when it is mounted. Referring to fig. 9, the top surface of the top cover 12 is provided with corrugated raised heat dissipating fins 121, which help to increase the surface area of the top cover 12 and speed up heat dissipation.
When the load control module in embodiment 2 is applied, the load control module is generally used as a large-current load control circuit, that is, a load end of a current power switch of the load control module can pass a large current, and the load control module in embodiment 3 is generally used as a small-current load control circuit, that is, a load end of a current power switch of the load control module can pass a small current. In order to avoid the failure of the current power switch BTS555 and lose the load protection function, a standby fuse FU can be connected in series at the load end of the current power switch, and the fusing heavy current of the standby fuse FU is larger than the set cut-off current. In one electrical control box, a large current load control circuit and a small current load control circuit can be present at the same time as required.
The present invention has been described in detail with reference to the accompanying drawings and embodiments, but those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention to form a plurality of specific embodiments, which are the common variation ranges of the present invention and will not be described in detail herein.
Claims (10)
1. A load control circuit is characterized by comprising a current power switch, a current detection module and a control module, wherein the current detection module is used for detecting the current of a load end of the current power switch and outputting a first signal related to the current of the load end, and the control module is used for receiving the first signal; when the load end of the current power switch needs to be disconnected, the control module outputs a second signal, the control end of the current power switch responds to the second signal to disconnect the load end of the current power switch, and the condition that the current of the load end corresponding to the first signal is larger than or equal to the set cut-off current is included when the load end of the current power switch needs to be disconnected.
2. The load control circuit of claim 1, wherein the current source switch is a current source switch having a current sensing element for sensing a load side current of the current source switch, and wherein a signal pin electrically connected to the current sensing element is formed on the current source switch.
3. The load control circuit of claim 1, wherein the current power switch comprises a smart hessian high current power switch.
4. An electrical control box comprising a housing, wherein the housing has a heat dissipating portion, and further comprising a heat conductive member and the load control circuit of any one of claims 1 to 3, wherein the heat conductive member is fixed within the housing and is in heat-conductive connection with the heat dissipating portion.
5. A load control module is characterized by comprising a control switch component and a control module component; the control switch assembly comprises a control switch base and a current power switch, wherein the control switch base comprises a load input conductive bar and a load output conductive bar, the current power switch comprises a load input pin, a load output pin, a control input pin and a signal output pin related to the current of a load end of the control input pin, the load input pin is electrically connected with the load input conductive bar, and the load output pin is electrically connected with the load output conductive bar; the control module comprises a control module base and a controller, the control module base is detachably connected with the control switch base, the controller is installed on the control module base, the controller is provided with a signal input pin and a control output pin, the signal output pin is detachably and electrically connected with the signal input pin, and the control output pin is detachably and electrically connected with the control input pin.
6. The load control module according to claim 5, wherein the control switch base further comprises a first insulating base, a power PCB board, and the load input conductive bar is fixedly connected to the power PCB board and electrically connected to the corresponding load input pin through a wire on the power PCB board, or the load output conductive bar is fixedly connected to the power PCB board and electrically connected to the corresponding load output pin through a wire on the power PCB board.
7. The load control module according to claim 6, wherein the first insulating base comprises a connector mounting hole, the control module base further comprises a connector, the contact pin of the connector is electrically connected to the load output conductive bar, and the connector is mounted in the connector mounting hole.
8. The load control module of claim 5, wherein the control module base further comprises a second insulating base, a signal PCB board; the controller is detachably connected with the second insulating base, the signal output pin and the control input pin are respectively and fixedly connected with the signal PCB, and the signal input pin and the control output pin are respectively and detachably and electrically connected with the signal PCB and are electrically connected with the corresponding signal output pin and the corresponding control input pin through wires on the signal PCB.
9. The load control module of claim 5, wherein the control switch base further comprises a first insulating base, the control module base further comprises a second insulating base, the second insulating base is a housing, and the first insulating base is hermetically connected with the second insulating base.
10. An electrical control box comprising a housing, characterized by further comprising a heat-conducting member and the load control module as claimed in any one of claims 5 to 9, the housing having a heat-dissipating portion, the heat-conducting member being fixed within the housing and thermally conductively connected to the heat-dissipating portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921103181.5U CN210680402U (en) | 2019-07-15 | 2019-07-15 | Load control circuit, load control module and electrical control box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921103181.5U CN210680402U (en) | 2019-07-15 | 2019-07-15 | Load control circuit, load control module and electrical control box |
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| CN210680402U true CN210680402U (en) | 2020-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481324A (en) * | 2019-07-15 | 2019-11-22 | 新乡市光明电器有限公司 | Load control circuit, load control mould group and electric control box |
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- 2019-07-15 CN CN201921103181.5U patent/CN210680402U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481324A (en) * | 2019-07-15 | 2019-11-22 | 新乡市光明电器有限公司 | Load control circuit, load control mould group and electric control box |
| CN110481324B (en) * | 2019-07-15 | 2024-08-16 | 新乡市光明电器有限公司 | Load control circuit, load control module and electrical control box |
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