CN109802362B - Intelligent multi-high-side switch backflow prevention device and method - Google Patents
Intelligent multi-high-side switch backflow prevention device and method Download PDFInfo
- Publication number
- CN109802362B CN109802362B CN201910052724.3A CN201910052724A CN109802362B CN 109802362 B CN109802362 B CN 109802362B CN 201910052724 A CN201910052724 A CN 201910052724A CN 109802362 B CN109802362 B CN 109802362B
- Authority
- CN
- China
- Prior art keywords
- voltage
- external battery
- side switch
- control device
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002265 prevention Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000009467 reduction Effects 0.000 claims description 24
- 239000013078 crystal Substances 0.000 claims description 6
- 230000006872 improvement Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 102100031577 High affinity copper uptake protein 1 Human genes 0.000 description 1
- 101710196315 High affinity copper uptake protein 1 Proteins 0.000 description 1
- 238000012952 Resampling Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses an intelligent multi-high-side switch backflow prevention device and method, wherein the device comprises: the high-side switch load driving device comprises a control device, a voltage acquisition device, a high-side switch load driving device and a first external battery for providing power for the control device; the control device is connected with the signal control end of each high-side switch of the high-side switch load driving device; the control device judges whether the first external battery is powered off or not according to the acquired voltage information of the first external battery, and judges whether the second external battery has power supply backward flow or not according to the acquired voltage information of the second external battery; the control device is also used for controlling all high-side switches in the high-side switch load driving device to be switched off when the first external battery is powered off or the second external battery has power supply backward flow. The invention solves the problem caused by the backflow of one or a few power supplies when a plurality of high-side switches are applied in the current practical application, enhances the reliability of the product, and has low cost of the solution scheme.
Description
Technical Field
The invention relates to a backflow prevention technology, in particular to an intelligent multi-high-side switch backflow prevention device and method.
Background
Referring to fig. 1, in fig. 1, UBB1 normally provides driving power to each of the high-side switches U1 Un, and when the high-side switch control signals CPU _ CTR1 to CPU _ CTRn are enabled, the loads valid 1 to valid n are driven, and the current flow is in the direction of the thick black line arrows in fig. 1.
The high-side switches are D1-Dn in fig. 1 due to the presence of their internal body diodes. When UBB2 is connected to the output end of one of the high-side switches, UBB2 is connected in series to UBB1 through a body diode D1, so that power is supplied to the high-side switches, such as U2-Un, and the like, if the high-side switches, U2-Un, are turned on, enough current needs to be drawn to UBB2 to drive loads, namely, volt 2-volt en, obviously, the load current with high power cannot be borne by D1, and therefore, the U1 is finally burnt out with excessive temperature. In view of the above, a structure capable of monitoring the voltage variation and intelligently preventing backflow is needed.
Disclosure of Invention
Technical problem to be solved
The invention provides an intelligent multi-high-side switch backflow prevention device and method, aiming at solving the problem that in the prior art, under the condition that a plurality of high-side switches are applied, one or more paths of high-side switches have power supply backflow, and other high-side switches do not know that the backflow exists, so that the high-side switches are turned on to cause the problem that diodes in the one or more paths of backflow high-side switches are burnt due to overcurrent.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the present invention provides an intelligent multi-high-side switch backflow prevention device, including:
the device comprises a control device, a voltage acquisition device, a high-side switch load driving device and a first external battery UEE for providing power for the control device;
the high-side switching load driving apparatus includes: a plurality of load branches, a second external battery UBB1 for providing power supply signals for all the load branches, each load branch being connected in series with a high-side switch for controlling the output of the power supply signals to the load;
the signal input ends of all the high-side switches are connected with the second external battery UBB1, and the output ends of all the high-side switches are connected with a third power supply UBB 2;
the control device is connected with a signal control end of each high-side switch of the high-side switch load driving device;
the voltage acquisition device is used for periodically acquiring voltage information of the first external battery and the second external battery;
the control device judges whether the first external battery is powered off or not according to the voltage information of the first external battery periodically acquired by the voltage acquisition device, and judges whether the second external battery has power supply backward flow or not according to the voltage information of the second external battery periodically acquired by the voltage acquisition device;
the control device is further used for controlling all high-side switches in the high-side switch load driving device to be switched off to prohibit the output of the high-side switches when the first external battery is powered off or the second external battery has power supply reverse flow.
As a further improvement of the invention, the method also comprises the following steps: and the direct-current voltage reduction circuit is connected between the first external battery UEE and the control device in series and is used for converting the voltage of the first external battery UEE into the voltage used by the control device.
Further, many high limit switches of intelligent prevent flowing backward the device and include: and the control device is connected with a signal control end of a high-side switch without a load branch in the high-side switch load driving device through the first switch K.
As a further improvement of the present invention, the control device includes:
the system comprises a micro control unit, a reset unit and a crystal oscillator unit;
the reset unit and the crystal oscillator unit are both connected with the micro control unit;
the control device also comprises an alarm unit which is used for sending out an alarm signal through the alarm unit when all the high-side switches in the high-side switch load driving device are controlled to be switched off.
As a further improvement of the present invention, the dc step-down circuit includes:
the first direct current voltage reduction circuit and the second direct current voltage reduction circuit are connected in series;
the output voltage of the first direct current voltage reduction circuit is 5V, and the second direct current voltage reduction circuit is used for converting the output voltage of the first direct current voltage reduction circuit into 3.3V to be output;
the first dc-dc voltage step-down circuit includes:
the full-control type switch tube, the fly-wheel diode and the inductance-capacitance filter circuit;
the B pole of the full-control type switch tube is connected with pulse driving equipment, the C pole of the full-control type switch tube is connected with the anode of the first external battery, and the E pole of the full-control type switch tube is connected with the input end of the inductance-capacitance filter circuit;
the anode of the freewheeling diode is connected with the cathode of the first external battery, and the cathode of the freewheeling diode is connected with the input end of the inductance-capacitance filter circuit; the output end of the inductance-capacitance filter circuit is connected with the control device;
the second direct current voltage reduction circuit and the first direct current voltage reduction circuit have the same structure.
As a further improvement of the invention, the intelligent multi-high side switch anti-backflow device is positioned in an on-board control device, and the first external battery and the second external battery are both connected with an on-board battery of the on-board control device.
As a further improvement of the present invention, the voltage collecting device periodically collects the voltage information of the second external battery, and includes:
the voltage acquisition device acquires the voltage of the signal input end of each high-side switch and the voltage of the output end of each high-side switch;
and taking the acquired voltage of the signal input end and the acquired voltage of the output end of each high-side switch as the voltages of two end points of the second external battery acquired by the voltage acquisition device.
As a further improvement of the present invention, the high-side switch is:
an IGBT with a body diode;
or a MOS tube with a body diode.
In a second aspect, the present invention further provides a backflow prevention method for an intelligent multi-high-side switch backflow prevention device based on the first aspect, including:
when the high-side switch is turned on, the voltage acquisition device periodically acquires the respective voltages of the first external battery UEE and the second external battery UBB 1;
the control device is used for judging whether the voltages of the first external batteries collected by the voltage collecting device are consistent or not; if not, judging whether the voltage of the first external battery collected from the current moment is the same as the voltage of the first external battery collected in the next preset time period; if the voltage values are the same, the voltage values are all smaller than the normal voltage value of the first external battery;
if the first external battery is determined to be in a power-down state, the control device sends a disconnection signal to the signal control ends of all the high-side switches in the high-side switch load driving device so as to disconnect all the high-side switches;
the control device judges whether the voltage of the second external battery collected from the current moment is the same as the voltage of the second external battery collected in the next preset time period or not according to whether the voltages of the two end points of the second external battery collected by the voltage collecting device are the same or not; if the voltage difference values are the same, the voltage difference value of the two endpoints is a first preset voltage value;
and if the second external battery is determined to be in the power supply backward flow state, the control device sends a disconnection signal to the signal control ends of all the high-side switches in the high-side switch load driving device so as to disconnect all the high-side switches.
As a further improvement of the present invention, the first preset voltage value is: 0.5-0.8V.
In a third aspect, the invention provides a vehicle-mounted control device, which comprises a vehicle-mounted battery and any one of the above intelligent multi-high-side switch backflow prevention devices, wherein a first external power supply and a second external power supply of the intelligent multi-high-side switch backflow prevention device are connected with the vehicle-mounted battery.
(III) advantageous effects
The invention focuses on the application field of the high-side switches, and under the condition that one or more high-side switches are applied, when a power supply flows backwards, the control device can control all the high-side switches to be switched off, so that the defect that the diodes in the one or more high-side switches flow backwards in the prior art are burnt due to overcurrent is overcome.
Furthermore, the reverse diode is not separately arranged in the invention, and the diode in the high-side switch is utilized to monitor the voltage, so that the cost of the product is reduced, no power consumption is increased, and the reliability of the application industrial product can be enhanced.
Drawings
FIG. 1 is a schematic diagram of a prior art high-side switching load driving apparatus;
fig. 2 is a schematic structural diagram of a high-side switching load driving apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc voltage reduction circuit according to an embodiment of the present invention.
Fig. 4 and fig. 5 are schematic flow diagrams of an intelligent multi-high-side switch backflow prevention method according to an embodiment of the present invention.
Detailed Description
For the purpose of better explaining the present invention, its detailed description will be given by way of specific embodiments in conjunction with the accompanying drawings.
With reference to fig. 2, a backflow prevention device of an intelligent multi-high-side switch in an embodiment of the present invention is described. The intelligent many high limit switches of this embodiment prevent flowing backward the device and include: the device comprises a control device, a voltage acquisition device, a high-side switch load driving device and a first external battery UEE for providing power for the control device;
the first external battery UEE is used for supplying power to the control device, and the control device is respectively connected with the first external battery UEE and the second external battery UBB1 through the electric tower collecting device; the control device is also used for controlling a high-side switch of the high-side switch load driving device.
The control device of the embodiment comprises a control unit MCU, a reset unit and a crystal oscillator unit; the reset unit and the crystal oscillator unit are connected with the micro control unit.
Referring to fig. 1, the high-side switching load driving apparatus in the present embodiment may include: a plurality of load branches, a second external battery UBB1 for providing power supply signals for all the load branches, each load branch being connected in series with a high-side switch for controlling the output of the power supply signals to the load;
the signal input ends of all the high-side switches are connected with the second external battery UBB1, and the output ends of all the high-side switches are connected with a third power supply UBB 2.
In fig. 1, the high-side switch may be: an IGBT with a body diode. Of course, in other embodiments, the high-side switch may also be a MOS transistor with a body diode.
In fig. 2, the control device is connected to the signal control terminal of each high-side switch of the high-side switch load driving device;
the voltage acquisition device is used for periodically acquiring voltage information of the first external battery and the second external battery;
the control device judges whether the first external battery is powered off or not according to the voltage information of the first external battery periodically acquired by the voltage acquisition device, and judges whether the second external battery has power supply backward flow or not according to the voltage information of the second external battery periodically acquired by the voltage acquisition device;
the control device is further used for controlling all high-side switches in the high-side switch load driving device to be switched off to prohibit the output of the high-side switches when the first external battery is powered off or the second external battery has power supply reverse flow.
Optionally, in practical applications, the intelligent multi-high-side switch backflow prevention device further includes: and a first switch K, through which the control device can be connected with a signal control terminal of a high-side switch without a load branch in the high-side switch load driving device, such as the signal control terminal connected with the CPU-CTR1 shown in FIG. 1.
That is, in fig. 2, the control device controls all the high-side switches in the high-side switch load driving device to be turned off, and the control device may control the first switch K to be turned off.
It should be noted that, the voltage collecting device periodically collects the voltage information of the second external battery, which is specifically understood as: the voltage acquisition device acquires the voltage of a signal input end A of each high-side switch and the voltage of an output end B of each high-side switch; namely, the voltage of the signal input end A and the voltage of the signal output end B of each high-side switch are collected as the voltages of two end points of the second external battery collected by the voltage collecting device.
That is to say, the voltage collecting device in this embodiment collects the voltage values of the two terminals a and B of the high-side switch.
In specific application, the power supply required by the MCU is relatively small, the voltage of the first external battery is relatively high, and the MCU cannot be directly supplied with power.
That is, the dc voltage step-down circuit is connected in series between the first external battery UEE and the control device, and is configured to convert the voltage of the first external battery UEE into the voltage used by the control device.
Fig. 2 shows two dc voltage-reducing circuits, such as a first dc voltage-reducing circuit and a second dc voltage-reducing circuit;
the output voltage of the first direct current voltage reduction circuit is 5V, and the second direct current voltage reduction circuit is used for converting the output voltage of the first direct current voltage reduction circuit into 3.3V to be output;
in a specific implementation, as shown in fig. 3, the first dc voltage reduction circuit may include: the full-control type switch tube, the fly-wheel diode and the inductance-capacitance (LC) filter circuit;
the B pole of the full-control type switch tube is connected with pulse driving equipment, the C pole of the full-control type switch tube is connected with the anode of the first external battery, and the E pole of the full-control type switch tube is connected with the input end of the inductance-capacitance filter circuit;
the anode of the freewheeling diode is connected with the cathode of the first external battery, and the cathode of the freewheeling diode is connected with the input end of the inductance-capacitance filter circuit; the output end of the inductance-capacitance filter circuit is connected with the control device;
input voltage ViIs the voltage of the first external battery. The fully-controlled switch in this embodiment may be a power transistor, such as a MOS transistor or a triode.
The LC filter circuit described above is primarily used to reduce harmonic voltages on the load.
Based on the first DC-DC step-down circuit shown in FIG. 3, the output voltage V0＝D×Vi；
Wherein, ViAnd D is the duty ratio/conduction ratio of an output waveform.
TonIndicating the on-time, T, of the fully-controlled switching tubesRepresenting one pulse period.
The second direct current voltage reduction circuit and the first direct current voltage reduction circuit have the same structure.
Further, the control device in the present embodiment may include: and the alarm unit is used for sending an alarm signal through the alarm unit when all the high-side switches in the high-side switch load driving device are controlled to be switched off.
The intelligent multi-high-side switch anti-backflow device is located in the vehicle-mounted control device, and the first external battery and the second external battery are connected with the vehicle-mounted battery of the vehicle-mounted control device.
In this embodiment, under the condition that a plurality of high-side switches are applied, when one or more of the high-side switches have power supply backflow, the control device in this embodiment can control all the high-side switches to be turned off, thereby avoiding the defect that the body diodes inside the one or more high-side switches that flow backward are burnt due to overcurrent in the prior art.
Particularly, in the embodiment, the backward diode is not separately arranged, and the diode provided in the high-side switch is used for monitoring the voltage, so that the cost of the product is reduced, the power consumption is not increased, and the reliability of the application industrial product can be enhanced.
In addition, according to another aspect of the present invention, the present invention further provides a backflow prevention method for an intelligent multi-high side switch backflow prevention device based on any of the above embodiments, as shown in fig. 4, the method may include the following steps:
s1, when the high-side switch is turned on, the voltage acquisition device periodically acquires the voltages of the first external battery UEE and the second external battery UBB 1;
s2, the control device judges whether the voltages of the first external batteries collected by the voltage collecting device are consistent; if not, judging whether the voltage of the first external battery collected from the current moment is the same as the voltage of the first external battery collected in the next preset time period; if the voltage values are the same, the voltage values are all smaller than the normal voltage value of the first external battery;
s3, if it is determined that the first external battery is in a power-down state, the control device sends a turn-off signal to the signal control terminals of all the high-side switches in the high-side switch load driving device to turn off all the high-side switches;
s4, the control device judges whether the voltage of the second external battery collected from the current moment is the same as the voltage of the second external battery collected in the next preset time period or not according to whether the voltages of the two end points of the second external battery collected by the voltage collecting device are the same or not; if the voltage difference between the two terminals is the same, the voltage difference between the two terminals is a first preset voltage value (such as 0.5-0.8V);
and S5, if the second external battery is determined to be in the power supply backflow state, the control device sends a disconnection signal to the signal control ends of all the high-side switches in the high-side switch load driving device so as to disconnect all the high-side switches.
That is, the voltage of the second external battery UBB1 may be collected in real time, and it is noted that the voltages of the second external battery UBB1 at the point a and the point B are sampled, and since the first external battery UEE and the second external battery UBB1 are both connected to the vehicle-mounted battery, the voltages are the same.
In the normal operating mode, i.e., when the high-side switch is normally open, the voltage at terminal a of the second external battery UBB1 and the voltage at terminal B of the second external battery UBB1 are substantially the same (neglecting voltage fluctuations due to internal resistance of the high-side switch).
When the connection of the third power supply UBB2 shown in fig. 1 occurs, the voltage at the terminal a of the second external battery UBB1 and the voltage at the terminal B of the second external battery UBB1 are different by about 0.5 to 0.8V, which is a junction voltage of one diode;
the MCU judges that the high-side switch has a backward flow current condition according to the voltages of the endpoint B and the endpoint A sampled by the voltage acquisition device if the endpoint B is greater than the voltage of the endpoint A by 0.5-0.8V, the MCU cuts off a control signal of the high-side switch through the high-side switch K at the moment, and a user configures the high-side switch to output invalid, so that the high-side switch is protected.
Further, as shown in fig. 5, the method of the present embodiment may include the following steps:
firstly, when the system works normally, the MCU controls the voltage acquisition device to start acquiring the voltages of a terminal A and a terminal B of a first external battery UEE and a second external battery UBB1, and the acquired voltage parameters are stored;
the sampling period in this embodiment is 200 ms.
Secondly, acquiring the voltage of the first external battery UEE and the voltage of the endpoint A and the endpoint B of the second external battery UBB1 again after 200ms, comparing the acquired voltage of the first external battery UEE with the acquired voltage stored last time, judging whether the acquired voltage is less than the acquired voltage of last time by more than 0.5V, if not, continuing parameter storage and cyclic sampling, and if so, comparing the cyclic sampling for 10 times to confirm that the acquired voltage value of the first external battery UEE is less than the UEE value sampled for the first time by more than 0.5V;
thirdly, after the result of the confirmation is 'yes', the MCU judges that the first external battery UEE is powered down and provides an alarm unit to send an alarm signal to a client;
when the result is determined as 'no', resampling and comparing to confirm whether the voltage value of the first external battery UEE sampled later is smaller than that of the first external battery UEE sampled for the first time, and after the first external battery UEE is judged to be powered off, switching off a high-side switch through a high-side switch K by a Micro Control Unit (MCU);
fourthly, whether the third power supply UBB2 is normally connected or not is judged, the values of the endpoint a and the endpoint B of the second external battery UBB1 are compared, and if the voltage value of the endpoint B is larger than the voltage value of the endpoint a and is approximately more than 0.5V, the power supply of the second external battery UBB is preliminarily judged to be in reverse flow;
and fifthly, sampling is carried out for 10 times in a circulating mode, whether the endpoint A of the second external battery is smaller than the endpoint B or not is confirmed for multiple times, if yes, it is judged that the second external battery has power supply backflow, the micro control unit MCU closes the high-side switch through the switch K, and alarm information is provided for a client. Otherwise, continuing sampling and circularly comparing.
The invention solves the problem caused by the backflow of one or a few power supplies when a plurality of high-side switches are applied in the current practical application, enhances the reliability of the product, and has low cost of the solution scheme.
In addition, according to another aspect of the invention, the invention further provides an on-board control device, which comprises an on-board battery, and the intelligent multi-high-side switch backflow prevention device, wherein the first external power supply and the second external power supply of the intelligent multi-high-side switch backflow prevention device are connected with the on-board battery.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a many high limit switches of intelligent prevent flowing backward device which characterized in that includes:
the device comprises a control device, a voltage acquisition device, a high-side switch load driving device and a first external battery for providing power for the control device;
the high-side switching load driving apparatus includes: the load branches are used for providing a second external battery for the power supply signal for all the load branches, and each load branch is connected with a high-side switch in series for controlling the power supply signal output to the load;
the signal input ends of all the high-side switches are connected with the second external battery, and the output ends of all the high-side switches are connected with a third power supply;
the control device is connected with a signal control end of each high-side switch of the high-side switch load driving device;
the voltage acquisition device is used for periodically acquiring voltage information of the first external battery and the second external battery;
the control device judges whether the first external battery is powered off or not according to the voltage information of the first external battery periodically acquired by the voltage acquisition device, and judges whether the second external battery has power supply backward flow or not according to the voltage information of the second external battery periodically acquired by the voltage acquisition device;
the control device is also used for controlling all high-side switches in the high-side switch load driving device to be switched off to prohibit the output of the high-side switches when the first external battery is powered off or the second external battery has power supply reverse flow;
the control device includes:
the system comprises a micro control unit, a reset unit and a crystal oscillator unit;
the reset unit and the crystal oscillator unit are both connected with the micro control unit;
many high limit switches of intelligent prevent flowing backward device includes: the control device is connected with a signal control end of a high-side switch without a load branch in the high-side switch load driving device through the first switch;
the voltage information of second external battery is gathered periodically to voltage acquisition device, includes:
the voltage acquisition device acquires the voltage of the signal input end of each high-side switch and the voltage of the output end of each high-side switch;
and taking the acquired voltage of the signal input end and the acquired voltage of the output end of each high-side switch as the voltages of two end points of the second external battery acquired by the voltage acquisition device.
2. The apparatus of claim 1, further comprising: and the direct-current voltage reduction circuit is connected between the first external battery and the control device in series and is used for converting the voltage of the first external battery into the voltage used by the control device.
3. The device of claim 2, wherein the control device further comprises an alarm unit for sending an alarm signal through the alarm unit when all the high-side switches in the high-side switch load driving device are controlled to be turned off.
4. The apparatus of claim 2, wherein the dc voltage reduction circuit comprises:
the first direct current voltage reduction circuit and the second direct current voltage reduction circuit are connected in series;
the output voltage of the first direct current voltage reduction circuit is 5V, and the second direct current voltage reduction circuit is used for converting the output voltage of the first direct current voltage reduction circuit into 3.3V to be output;
the first dc-dc voltage step-down circuit includes:
the full-control type switch tube, the fly-wheel diode and the inductance-capacitance filter circuit;
the B pole of the full-control type switch tube is connected with pulse driving equipment, the C pole of the full-control type switch tube is connected with the anode of the first external battery, and the E pole of the full-control type switch tube is connected with the input end of the inductance-capacitance filter circuit;
the anode of the freewheeling diode is connected with the cathode of the first external battery, and the cathode of the freewheeling diode is connected with the input end of the inductance-capacitance filter circuit; the output end of the inductance-capacitance filter circuit is connected with the control device;
the second direct current voltage reduction circuit and the first direct current voltage reduction circuit have the same structure.
5. The device of any one of claims 1 to 4, wherein the intelligent multi-high side switch anti-back-flow device is located in an on-board control device, and the first external battery and the second external battery are both connected with an on-board battery of the on-board control device.
6. The apparatus of claim 1, wherein the high-side switch is:
an IGBT with a body diode;
or a MOS tube with a body diode.
7. A backflow prevention method of an intelligent multi-high side switch backflow prevention device based on any one of the claims 1 to 6, comprising the following steps:
when the high-side switch is turned on, the voltage acquisition device periodically acquires the respective voltages of the first external battery and the second external battery;
the control device is used for judging whether the voltages of the first external batteries collected by the voltage collecting device are consistent or not; if not, judging whether the voltage of the first external battery collected from the current moment is the same as the voltage of the first external battery collected in the next preset time period; if the voltage values are the same, the voltage values are all smaller than the normal voltage value of the first external battery;
if the first external battery is determined to be in a power-down state, the control device sends a disconnection signal to the signal control ends of all the high-side switches in the high-side switch load driving device so as to disconnect all the high-side switches;
the control device judges whether the voltage of the second external battery collected from the current moment is the same as the voltage of the second external battery collected in the next preset time period or not according to whether the voltages of the two end points of the second external battery collected by the voltage collecting device are the same or not; if the voltage difference values are the same, the voltage difference value of the two endpoints is a first preset voltage value;
and if the second external battery is determined to be in the power supply backward flow state, the control device sends a disconnection signal to the signal control ends of all the high-side switches in the high-side switch load driving device so as to disconnect all the high-side switches.
8. The method according to claim 7, wherein the first preset voltage value is: 0.5-0.8V.
9. An on-vehicle control device, including on-vehicle battery, characterized by, still include the many high-sides of the intelligence of above-mentioned claim 1 to 6 switch prevents the device that flows backwards, the many high-sides of intelligence switch prevents that the first external power source and the second external power source of the device that flows backwards connect the on-vehicle battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910052724.3A CN109802362B (en) | 2019-01-21 | 2019-01-21 | Intelligent multi-high-side switch backflow prevention device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910052724.3A CN109802362B (en) | 2019-01-21 | 2019-01-21 | Intelligent multi-high-side switch backflow prevention device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109802362A CN109802362A (en) | 2019-05-24 |
| CN109802362B true CN109802362B (en) | 2020-10-30 |
Family
ID=66559915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910052724.3A Active CN109802362B (en) | 2019-01-21 | 2019-01-21 | Intelligent multi-high-side switch backflow prevention device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109802362B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167164A (en) * | 2021-11-11 | 2022-03-11 | 潍柴动力股份有限公司 | High-side power supply detection method and device, electronic equipment and storage medium |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013002356B4 (en) * | 2013-02-08 | 2016-07-21 | HKR Seuffer Automotive GmbH & Co. KG | Apparatus and method for pulsed control of load elements in motor vehicles |
| CN103607824B (en) * | 2013-11-25 | 2016-05-04 | 重庆川仪自动化股份有限公司 | A kind of controlling apparatus for indicator lamp and system |
| CN204327371U (en) * | 2014-09-04 | 2015-05-13 | 罗家豪 | A kind of electronic ignition control gear and system |
| CN204481525U (en) * | 2015-04-02 | 2015-07-15 | 青岛歌尔声学科技有限公司 | Based on many batteries power circuit and there is the electronic product of described power circuit |
| CN105522987B (en) * | 2015-12-17 | 2018-02-16 | 长城信息产业股份有限公司 | A kind of intelligent vehicle-carried power distribution protective device and its method |
| CN205453108U (en) * | 2015-12-30 | 2016-08-10 | 温州科博达汽车部件有限公司 | On -vehicle high limit switch |
| CN205792220U (en) * | 2016-06-15 | 2016-12-07 | 浙江科博达工业有限公司 | High side switches anti-electric current back flow circuit |
| CN105977952B (en) * | 2016-06-16 | 2019-08-13 | 阳光电源股份有限公司 | A kind of reverse connection prevention protection circuit |
| CN206353706U (en) * | 2016-12-20 | 2017-07-25 | 深圳创维－Rgb电子有限公司 | A kind of electric equipment and its power-down protection circuit |
| CN207339238U (en) * | 2017-09-26 | 2018-05-08 | 佛山市法恩洁具有限公司 | Power-down protection circuit for sensing sanitary appliance |
| CN207311174U (en) * | 2017-10-09 | 2018-05-04 | 广州汽车集团零部件有限公司 | A kind of pure electric automobile Permanent Magnet Synchronous Motor Controller and control system of electric automobile |
| CN109067387A (en) * | 2018-07-19 | 2018-12-21 | 启攀微电子（上海）有限公司 | A kind of load switching circuit |
-
2019
- 2019-01-21 CN CN201910052724.3A patent/CN109802362B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109802362A (en) | 2019-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109168326B (en) | Power supply device | |
| US10230310B2 (en) | Safety switch for photovoltaic systems | |
| US8098056B2 (en) | Bidirectional converter and electronic device | |
| US9385600B2 (en) | Low-loss step-up and step-down voltage converter | |
| US9306082B2 (en) | System for managing and controlling photovoltaic panels | |
| CN109410817B (en) | Power supply control device and display device | |
| CN102570840A (en) | Voltage anode and cathode polarity switching circuit | |
| US20190308573A1 (en) | Vehicle-mounted power supply device | |
| US20140092652A1 (en) | Power supply device and method of determining abnormality in power supply device | |
| CN109802362B (en) | Intelligent multi-high-side switch backflow prevention device and method | |
| CN113924721B (en) | Vehicle-mounted power supply system | |
| CN104350671B (en) | Switch conversion power source device | |
| CN116885946B (en) | Step-down circuit and control method thereof | |
| CN104836328A (en) | Power supply device and working method thereof | |
| CN116915169B (en) | Photovoltaic cell bypass circuit | |
| CN211019359U (en) | Photovoltaic street lamp control device and photovoltaic street lamp equipment | |
| CN215419699U (en) | Battery power supply system of electromagnetic water meter and electromagnetic water meter | |
| CN115520045A (en) | Power supply module, power supply control method for vehicle mutual charging and vehicle | |
| CN114157129A (en) | Bidirectional current limiting circuit and working method thereof | |
| CN219458888U (en) | Single live wire power supply circuit | |
| EP1855373A2 (en) | DC-DC Converter | |
| CN105024351B (en) | Based on output over-voltage protection method, protection circuit and the translation circuit sampled indirectly | |
| CN210201712U (en) | Load identification circuit | |
| CN219611347U (en) | Reverse connection preventing circuit, power supply circuit and vehicle | |
| CN221126941U (en) | Standby battery pack power supply circuit capable of automatically switching power supply modes and power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: An intelligent multi-high side switch anti-backflow device and method Effective date of registration: 20220803 Granted publication date: 20201030 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA SONNEPOWER TECHNOLOGY CO.,LTD. Registration number: Y2022430000067 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231030 Granted publication date: 20201030 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: CHANGSHA SONNEPOWER TECHNOLOGY CO.,LTD. Registration number: Y2022430000067 |