CN214337794U - Passive discharge circuit of low-voltage system - Google Patents
Passive discharge circuit of low-voltage system Download PDFInfo
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- CN214337794U CN214337794U CN202023191513.5U CN202023191513U CN214337794U CN 214337794 U CN214337794 U CN 214337794U CN 202023191513 U CN202023191513 U CN 202023191513U CN 214337794 U CN214337794 U CN 214337794U
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Abstract
The utility model relates to a device field for protecting the converter specifically is a low pressure system passive discharge circuit. A low-voltage system passive discharge circuit comprises a direct current power supply (1), and is characterized in that: the energy storage capacitor (2), the pull-up resistor (31), the pull-down resistor (32), the discharge resistor (33), the field effect transistor (4) and the break contact (5) are further included, and three nodes, namely one end of the energy storage capacitor (2), one end of the pull-up resistor (31) and the drain electrode of the field effect transistor (4), are connected with the positive electrode of the direct-current power supply (1) through a control bus (6) which is connected with the break contact (5) in series; the other end of the energy storage capacitor (2) is connected with the negative electrode of the direct current power supply (1). The utility model discloses compact structure reduces the consumption, and the configuration is nimble, safe and reliable.
Description
Technical Field
The utility model relates to a device field for protecting the converter specifically is a low pressure system passive discharge circuit.
Background
At present, a passive discharge circuit of a low-voltage system mainly releases energy by connecting a plurality of discharge resistors in parallel. When the main circuit is powered on, all power supply sources are loaded on the discharge resistor, and the discharge resistor continuously runs with high power consumption; when the main circuit switch is disconnected, the energy of the DC-Link energy storage capacitor is released through the discharge resistor, the voltage of the bus on the side of the controller is rapidly reduced, and the fault that the relay is adhered is misinformed after the power supply is disconnected.
The method can realize the control requirement of passive discharge after the relay is disconnected, but the battery voltage is directly loaded on the discharge resistor, and when the relay is closed, the full voltage of the discharge resistor continuously works, so that the standby power consumption and the power consumption in the running process are increased; the larger power consumption requires larger package and more discharge resistors, so that the layout space is larger, and the problems of heat generation and the like are also caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a compact structure, reduction consumption, configuration are nimble, safe and reliable, the utility model discloses a low pressure system passive discharge circuit.
The utility model discloses a following technical scheme reaches the invention purpose:
a low-voltage system passive discharge circuit comprises a direct-current power supply and is characterized in that: also comprises an energy storage capacitor, a pull-up resistor, a pull-down resistor, a discharge resistor, a field effect transistor and a break contact,
one end of the energy storage capacitor, one end of the pull-up resistor and the drain electrode of the field effect transistor are connected with each other and then connected with the anode of the direct current power supply through a control bus in series connection with the break contact;
the other end of the energy storage capacitor is connected with the negative electrode of the direct current power supply;
the other end of the pull-up resistor is respectively connected with the grid of the field effect transistor and one end of the pull-down resistor, and the source electrode of the field effect transistor is connected with one end of the discharge resistor;
the other end of the pull-down resistor and the other end of the discharge resistor are both connected with the negative electrode of the direct current power supply.
The low-voltage system passive discharge circuit is characterized in that: the field effect transistor is an N-channel enhanced insulated gate field effect transistor.
The use method of the low-voltage system passive discharge circuit is characterized in that: the method is implemented in sequence according to the following steps:
closing: when the main circuit relay is closed, the break contact is closed at the moment, the field effect tube drives the grid electrode to reach threshold opening voltage due to the partial pressure action of the pull-up resistor and the pull-down resistor, current starts to flow through the drain electrode of the field effect tube, meanwhile, due to the existence of the discharge resistor, the source electrode voltage of the field effect tube is continuously raised along with the increase of the drain electrode current of the field effect tube, the potential difference between the grid electrode and the source electrode of the field effect tube is continuously reduced until the potential difference reaches the grid source opening threshold voltage of the field effect tube, the field effect tube is in unsaturated conduction at the moment, and the voltage of the direct current power supply cannot be completely loaded on the discharge resistor;
cutting off: when the main circuit relay is disconnected, the dynamic breaking contact is disconnected, due to the energy storage effect of the energy storage capacitor, the potential of the energy storage capacitor end of the control bus slowly drops from the potential of the direct current power source end of the control bus after the dynamic breaking contact is disconnected, the field effect transistor still works in an amplification area within a period of time after the dynamic breaking contact is disconnected, due to the consumption of the discharge resistor, the potential of the energy storage capacitor end of the control bus continuously drops, the discharge current of the energy storage capacitor continuously decreases until the potential of the energy storage capacitor end of the control bus is low enough not to drive the field effect transistor to be opened, and at the moment, the passive discharge of the energy storage capacitor stops. In the whole passive discharge process, the duration of the passive discharge and the discharge current can be realized by adjusting the resistance values of the pull-up resistor, the pull-down resistor and the discharge resistor, and the safe potential for finally stopping the discharge can also be realized by adjusting the resistance values of the pull-up resistor and the pull-down resistor.
The utility model discloses utilize the operating characteristic in field effect transistor amplification area, when the relay closure made the dynamic break contact closed, DC power supply's partial voltage distribution had been between field effect transistor's drain electrode and source electrode, and only partial voltage consumption is on discharge resistance, has greatly reduced the standby power consumption of system during operation and the power loss of operation in-process, and the reduction generates heat, and because the consumption falls and low discharge resistance quantity reduces, also can save the overall arrangement space. The utility model discloses can accomplish passive discharge's function needs after the outage, can dispose in a flexible way to the operation scene discharge time of difference moreover, can satisfy controller outage back bus voltage through suitable parameter adjustment and descend safe voltage range in the time of regulation, prevent the mistrigger whole car relay glutinous trouble even and take place, optimized system's consumption and stabilized safe design demand.
The utility model discloses following beneficial effect has: compact structure, reduced power consumption, flexible configuration, safety and reliability.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A low-voltage system passive discharge circuit comprises a direct-current power supply 1, an energy storage capacitor 2, a pull-up resistor 31, a pull-down resistor 32, a discharge resistor 33, a field effect transistor 4 and a dynamic break contact 5, and the specific structure is as shown in the figure:
one end of the energy storage capacitor 2, one end of the pull-up resistor 31 and the drain electrode of the field effect tube 4 are connected with each other and then connected with the anode of the direct current power supply 1 through a control bus 6 which is connected with the dynamic break contact 5 in series;
the other end of the energy storage capacitor 2 is connected with the negative electrode of the direct current power supply 1;
the other end of the pull-up resistor 31 is respectively connected with the grid of the field effect transistor 4 and one end of the pull-down resistor 32, and the source of the field effect transistor 4 is connected with one end of the discharge resistor 33;
the other end of the pull-down resistor 32 and the other end of the discharge resistor 33 are both connected to the negative electrode of the dc power supply 1.
In this embodiment: the field effect transistor 4 is an N-channel enhanced insulated gate field effect transistor.
In fig. 1: e is the dc power supply 1, C is the energy storage capacitor 2, R1 is the pull-up resistor 31, R2 is the pull-down resistor 32, R3 is the discharge resistor 33, Q is the fet 4, G, D and S are the gate, drain and source of the fet 4, respectively, and K is the trip contact 5.
When the method is used, the steps are implemented in sequence as follows:
closing: when the main circuit relay is closed, the break contact 5 is closed, due to the voltage division effect of the pull-up resistor 31 and the pull-down resistor 32, the field effect tube 4 drives the grid to reach threshold opening voltage, current starts to flow through the drain of the field effect tube 4, meanwhile, due to the existence of the discharge resistor 33, along with the increase of the current flowing through the drain of the field effect tube 4, the source voltage of the field effect tube 4 is continuously raised, the potential difference between the grid and the source of the field effect tube 4 is continuously reduced until the potential difference reaches the grid source opening threshold voltage of the field effect tube 4, and the voltage of the direct current power supply 1 cannot be completely loaded on the discharge resistor 33;
cutting off: when the main circuit relay is disconnected, the dynamic breaking contact 5 is disconnected at the moment, due to the energy storage effect of the energy storage capacitor 2, the potential of the energy storage capacitor end of the control bus 6 is slowly reduced from the potential of the direct-current power supply end of the control bus 6 after the dynamic breaking contact 5 is disconnected, the field effect transistor 4 still works in an amplification area within a period of time after the dynamic breaking contact 5 is disconnected, due to the consumption of the discharge resistor 33, the potential of the energy storage capacitor end of the control bus 6 is continuously reduced, the discharge current of the energy storage capacitor 2 is continuously reduced until the potential of the energy storage capacitor end of the control bus 6 is low enough not to drive the field effect transistor 4 to be opened, and at the moment, the passive discharge of the energy storage capacitor 2 is stopped. In the whole passive discharge process, the duration of the passive discharge and the discharge current can be realized by adjusting the resistance values of the pull-up resistor 31, the pull-down resistor 32 and the discharge resistor 33, and the safety potential for finally stopping the discharge can also be realized by adjusting the resistance values of the pull-up resistor 31 and the pull-down resistor 32.
In this embodiment: if the gate-source turn-on threshold voltage of the fet 4 is 4V, the electromotive force of the dc power supply 1 is 12V, the resistance values of the pull-up resistor 31 and the pull-down resistor 32 are equal to each other, and the resistance value of the discharge resistor 33 is 500 Ω, then the discharge current I =isobtained
=0.004A =4 mA. If the discharge time needs to be reduced, the resistance of the discharge resistor 33 can be reduced, and if the resistance of the discharge resistor 33 is reduced to 100 Ω, the discharge current I =isobtained
=0.02A =20mA, an increase in discharge current will shorten the discharge time since the amount of power dissipated is the same; the final stop voltage can be realized by selecting the field effect transistors 4 with different threshold voltagesIn this embodiment, when the voltage of the energy storage capacitor 2 is reduced to about 8V, the divided driving voltage is exactly 4V, and the fet 4 cannot be driven to flow current any more, thereby stopping discharging.
Claims (2)
1. A low-voltage system passive discharge circuit comprises a direct current power supply (1), and is characterized in that: also comprises an energy storage capacitor (2), a pull-up resistor (31), a pull-down resistor (32), a discharge resistor (33), a field effect tube (4) and a break contact (5),
one end of the energy storage capacitor (2), one end of the pull-up resistor (31) and the drain electrode of the field effect transistor (4) are connected with each other and then connected with the anode of the direct current power supply (1) through a control bus (6) which is connected with the dynamic break contact (5) in series;
the other end of the energy storage capacitor (2) is connected with the negative electrode of the direct current power supply (1);
the other end of the pull-up resistor (31) is respectively connected with the grid of the field effect transistor (4) and one end of the pull-down resistor (32), and the source of the field effect transistor (4) is connected with one end of the discharge resistor (33);
the other end of the pull-down resistor (32) and the other end of the discharge resistor (33) are both connected with the negative electrode of the direct current power supply (1).
2. The low voltage system passive discharge circuit of claim 1, further comprising: the field effect tube (4) is an N-channel enhanced insulated gate field effect tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023191513.5U CN214337794U (en) | 2020-12-27 | 2020-12-27 | Passive discharge circuit of low-voltage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564468A (en) * | 2020-12-27 | 2021-03-26 | 格至控智能动力科技（上海）有限公司 | Passive discharge circuit of low-voltage system and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112564468A (en) * | 2020-12-27 | 2021-03-26 | 格至控智能动力科技（上海）有限公司 | Passive discharge circuit of low-voltage system and use method thereof |
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