Novel direct-current high-voltage pre-charging circuit

Abstract

The utility model provides a novel direct-current high-voltage pre-charging circuit, which comprises a current suppression module, a rectifier module, a switch module, a chip control module, a voltage sampling module and a bus, and is characterized in that the current suppression module is electrically connected with the rectifier module, and the voltage sampling module is electrically connected with the chip control module; through a current suppression module, a rectifier module, a switch module, a voltage sampling module and a chip control module, after the mains supply / generator is connected, the mains supply voltage / generator voltage only has a half-cycle voltage value after passing through the current suppression module; the voltage of the half period flows through the rectifier module and is converted into direct current from alternating current to pre-charge bus voltage; if the chip detects that the bus voltage sampling signal transmitted by the voltage sampling module is larger than the peak value of the voltage provided by the input source, the control module sends an RY control signal to control the on-off of the switch, and pre-charging is completed; therefore, the pre-charging of the bus voltage is realized.

Description

Technical Field

[0001] The invention relates to the technical field of precharging circuits, and in particular to a novel direct current high-voltage precharging circuit. Background Art

[0002] The main function of the pre-charging circuit is to charge the large capacitor of the motor controller (i.e. inverter) to reduce spark arcing when the contactor contacts, reduce impact and increase safety. When the capacitor is connected in parallel at both ends of the power supply, when the power is turned on, the voltage across the capacitor will not change suddenly, but the current across the capacitor will change suddenly. If there is no pre-charging circuit, the contactor will stick or be damaged due to the large current, affecting the safety and reliability of the motor controller.

[0003] In view of the above, a novel DC high voltage pre-charging circuit is proposed to realize pre-charging of the bus voltage. Summary of the invention

[0004] The embodiment of the present invention provides a novel DC high-voltage pre-charging circuit, which realizes pre-charging of the bus voltage through a current suppression module, a rectification module, a switch module, a voltage sampling module, and a chip control module.

[0005] In view of the above problems, the technical solution proposed by the present invention is:

[0006] A novel DC high-voltage precharging circuit comprises a current suppression module, a rectifier module, a switch module, a chip control module, a voltage sampling module and a busbar, wherein the current suppression module is electrically connected to the rectifier module, the rectifier module is electrically connected to the switch module, the voltage sampling module is electrically connected to the chip control module, the chip control module is electrically connected to the switch module, the switch module and the rectifier module are electrically connected to the busbar respectively, and the voltage sampling module is electrically connected to the busbar.

[0007] As a preferred technical solution of the present invention, the current suppression module includes a GRID port, a GEN port, a PTC resistor R5, a PTC resistor R168, a PTC resistor R433, a PTC resistor R169, a diode D40, a PTC resistor R171, a PTC resistor R134, a PTC resistor R435, a PTC resistor R160 and a diode D22. The PTC resistor R5 and the PTC resistor R168 are connected in parallel and in series with the GRID port. The PTC resistor R433 and the PTC resistor R169 are connected in parallel and in series with the diode D40 and the GRID port. The PTC resistor R171 and the PTC resistor R134 are connected in parallel and in series with the GEN port. The PTC resistor R435 and the PTC resistor R160 are connected in parallel and in series with the diode D22 and the GEN port.

[0008] As a preferred technical solution of the present invention, the rectifier module includes a rectifier D81 and a rectifier D82, the interface 1 of the rectifier D81 is connected in series with the PTC resistor R5 and the PTC resistor R168, the interface 2 of the rectifier D81 is connected in series with the PTC resistor R433, the PTC resistor R169, and the diode D40, the interface 1 of the rectifier D82 is connected in series with the PTC resistor R171 and the PTC resistor R134, the interface 2 of the rectifier D82 is connected in series with the PTC resistor R435, the PTC resistor R160, and the diode D22, the interface 3 of the rectifier D81 is connected in parallel with the interface 3 of the rectifier D82, and is connected in series with the bus, and the interface 4 of the rectifier D81 is connected in parallel with the interface 4 of the rectifier D82.

[0009] As a preferred technical solution of the present invention, the switch module includes relay RY22 and relay RY23, and the wires between interface 1 of relay RY22, interface 1 of relay RY23 and interface 4 of rectifier D81 and interface 4 of rectifier D82 are electrically connected, interface 6 of relay RY22 and interface 6 of relay RY23 are connected in series, interface 5 of relay RY22 and interface 5 of relay RY23 are connected in series, interface 4 of relay RY22 and interface 4 of relay RY23 are connected in parallel, and are connected in series with the bus.

[0010] As a preferred technical solution of the present invention, a capacitor C71 is connected between the interface 3 of the rectifier D81, the wire connecting the interface 3 of the rectifier D82 and the bus, the interface 4 of the relay RY22, and the wire connecting the interface 4 of the relay RY23 and the bus.

[0011] As a preferred technical solution of the present invention, the chip control module is composed of a DSP chip and peripheral circuits.

[0012] As a preferred technical solution of the present invention, the voltage sampling module includes an integrated chip U5, a chip U4, a diode D21, a diode D15, a resistor R17, a resistor R18, a resistor R24, a resistor R25, a resistor R359, a resistor R373, a resistor R361, a resistor R372, a resistor R374, a resistor R309, a capacitor C24, a capacitor C29, a capacitor C112, and a capacitor C109. The resistor R17 is connected in series with the interface 12 and the bus of the chip U5, and the resistor R17 The chip U5 is connected in parallel with the resistor R18 and the capacitor C24, the resistor R18 and the capacitor C24 are connected in parallel and are connected in series with the first ground terminal GND-S, the interface 13 and the interface 14 of the chip U5 are electrically connected, and the interface 14 of the chip U5 is connected in series with the resistor R359, the resistor R359 and the diode D21 are connected in series, the resistor R359 and the capacitor C112 are connected in series, the capacitor C112 is connected in series with the second ground terminal GND-S, the diode D21 is connected in series with the third ground terminal GND-S, the resistor R3 59 is connected in series with resistor R361 and resistor R372, and the resistors R361 and R372 are connected in parallel and are electrically connected to the busbar respectively; the resistor R24 ​​is connected in series with interface 3 of chip U4 and the busbar, and the resistor R17 is connected in parallel with resistor R25 and capacitor C29, and the resistor R25 and capacitor C29 are connected in parallel and are connected in series with a fourth ground terminal GND-S, the interface 2 of the chip U5 is electrically connected to interface 1, the interface 4 of the chip U4 and interface 11 are supplied with a 12V voltage, and the interface of the chip U4 is connected in parallel with the fourth ground terminal GND-S. Port 1 is connected in series with resistor R373, the resistor R373 is connected in series with diode D15, the resistor R373 is also connected in series with capacitor C109, the capacitor C109 is connected in series with a fifth ground terminal GND-S, the diode D15 is connected in series with a sixth ground terminal GND-S, the resistor R373 is connected in series with resistor R309 and resistor R374, the resistor R309 and resistor R374 are connected in parallel and are electrically connected to the bus respectively, and the diode D15 and diode D21 are respectively supplied with 3.3V voltage.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the main architecture of the present technical solution is composed of a current suppression module, a rectifier module, a switch module, a voltage sampling module, and a chip control module. After being connected to the AC power / generator, the AC power voltage / generator voltage has only a half-cycle voltage value after passing through the current suppression module; this half-cycle voltage then flows through the rectifier module to convert it from AC to DC, and pre-charges the bus voltage; if the chip detects that the bus voltage sampling signal transmitted by the voltage sampling module is greater than the peak voltage provided by the input source, the RY control signal is sent through the control module to control the switch to be turned off, and the pre-charging is completed; thereby achieving the pre-charging of the bus voltage.

[0014] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A system block diagram of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention;

[0016] Figure 2 A circuit diagram of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention;

[0017] Figure 3 A circuit diagram of a current suppression module of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention;

[0018] Figure 4 A circuit diagram of a rectifier module of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention;

[0019] Figure 5 A circuit diagram of a switch module of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention;

[0020] Figure 6 The present invention is a circuit diagram of a voltage sampling module of a novel DC high voltage pre-charging circuit disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Embodiment 1

[0023] Refer to the attached Figure 1 As shown, a novel DC high voltage pre-charging circuit comprises:

[0024] It includes a current suppression module, a rectifier module, a switch module, a chip control module, a voltage sampling module, and a bus. The current suppression module and the rectifier module are electrically connected, the rectifier module and the switch module are electrically connected, the voltage sampling module and the chip control module are electrically connected, the chip control module and the switch module are electrically connected, the switch module and the rectifier module are electrically connected to the bus respectively, and the voltage sampling module is electrically connected to the bus.

[0025] Specifically, after connecting to the AC power / generator, the AC power voltage / generator voltage has only a half-cycle voltage value after passing through the current suppression module; this half-cycle voltage then flows through the rectifier module, converting it from AC to DC, and pre-charging the bus voltage; if the chip detects that the bus voltage sampling signal transmitted by the voltage sampling module is greater than the peak voltage provided by the input source, the RY control signal is sent through the control module to control the shutdown of the switch, and the pre-charging is completed; thereby achieving the pre-charging of the bus voltage.

[0026] Embodiment 2

[0027] Refer to the attached Figure 2-Figure 6 As shown, a novel DC high-voltage pre-charging circuit includes a current suppression module including a GRID port, a GEN port, a PTC resistor R5, a PTC resistor R168, a PTC resistor R433, a PTC resistor R169, a diode D40, a PTC resistor R171, a PTC resistor R134, a PTC resistor R435, a PTC resistor R160 and a diode D22. The PTC resistor R5 and the PTC resistor R168 are connected in parallel and in series with the GRID port. The PTC resistor R433 and the PTC resistor R169 are connected in parallel and in series with the diode D40 and the GRID port. The PTC resistor R171 and the PTC resistor R134 are connected in parallel and in series with the GEN port. The PTC resistor R435 and the PTC resistor R160 are connected in parallel and in series with the diode D22 and the GEN port.

[0028] Specifically, the current suppression module can realize the current suppression function.

[0029] In one embodiment of the present invention, further, the rectifier module includes a rectifier D81 and a rectifier D82, the interface 1 of the rectifier D81 is connected in series with the PTC resistor R5 and the PTC resistor R168, the interface 2 of the rectifier D81 is connected in series with the PTC resistor R433, the PTC resistor R169, and the diode D40, the interface 1 of the rectifier D82 is connected in series with the PTC resistor R171 and the PTC resistor R134, the interface 2 of the rectifier D82 is connected in series with the PTC resistor R435, the PTC resistor R160, and the diode D22, the interface 3 of the rectifier D81 is connected in parallel with the interface 3 of the rectifier D82, and is connected in series with the bus, and the interface 4 of the rectifier D81 is connected in parallel with the interface 4 of the rectifier D82.

[0030] Specifically, the rectifier module is mainly responsible for rectifying and converting AC power into DC power to supply bus voltage pre-charging.

[0031] In one embodiment of the present invention, further, the switch module includes relay RY22 and relay RY23, and the wires between interface 1 of relay RY22, interface 1 of relay RY23 and interface 4 of rectifier D81 and interface 4 of rectifier D82 are electrically connected, interface 6 of relay RY22 and interface 6 of relay RY23 are connected in series, interface 5 of relay RY22 and interface 5 of relay RY23 are connected in series, interface 4 of relay RY22 and interface 4 of relay RY23 are connected in parallel, and are connected in series with the bus.

[0032] Specifically, when it is detected that the bus voltage is greater than 400V, an RY control signal is sent to control the conduction state of the relay.

[0033] In one embodiment of the present invention, a capacitor C71 is further connected between the interface 3 of the rectifier D81, the wire connected to the interface 3 of the rectifier D82 and the bus, the interface 4 of the relay RY22, and the wire connected to the bus.

[0034] Specifically, the main function is to sample the BUS-V voltage signal to obtain a sampling signal with a voltage range of 0-3.3V. The DSP chip then determines whether the bus voltage has been pre-charged by the high and low levels of the sampling signal.

[0035] According to an embodiment of the present invention, further, the chip control module is composed of a DSP chip and peripheral circuits.

[0036] Specifically, it integrates system control signals, receives bus voltage signals, sends RY control signals, and controls the relay switch module.

[0037] Specifically, when pre-charging starts, the relay is in the on state; after the current signal flows out of the rectifier bridge, it passes through the relay to pre-charge the bus voltage. When the DSP chip detects that the bus voltage is greater than 400V, it sends an RY control signal to the relay switch to cut off the relay, making it impossible to form a path, and the pre-charging ends.

[0038] In one embodiment of the present invention, further, the voltage sampling module includes an integrated chip U5, a chip U4, a diode D21, a diode D15, a resistor R17, a resistor R18, a resistor R24, a resistor R25, a resistor R359, a resistor R373, a resistor R361, a resistor R372, a resistor R374, a resistor R309, a capacitor C24, a capacitor C29, a capacitor C112, and a capacitor C109, wherein the resistor R17 is connected in series with the interface 12 and the bus of the chip U5, and the resistor R 17 is connected in parallel with the resistor R18 and the capacitor C24, the resistor R18 and the capacitor C24 are connected in parallel and are connected in series with the first ground terminal GND-S, the interface 13 of the chip U5 is electrically connected to the interface 14, and the interface 14 of the chip U5 is connected in series with the resistor R359, the resistor R359 and the diode D21 are connected in series, the resistor R359 and the capacitor C112 are connected in series, the capacitor C112 is connected in series with the second ground terminal GND-S, the diode D21 is connected in series with the third ground terminal GND-S, the resistor R 359 is connected in series with resistor R361 and resistor R372, and the resistors R361 and R372 are connected in parallel and are electrically connected to the busbar respectively; the resistor R24 ​​is connected in series with interface 3 of chip U4 and the busbar, and the resistor R17 is connected in parallel with resistor R25 and capacitor C29, and the resistor R25 and capacitor C29 are connected in parallel and are connected in series with a fourth ground terminal GND-S, the interface 2 of the chip U5 is electrically connected to interface 1, the interface 4 of the chip U4 and interface 11 are supplied with 12V voltage, and the chip U4 Interface 1 is connected in series with resistor R373, the resistor R373 is connected in series with diode D15, the resistor R373 is also connected in series with capacitor C109, the capacitor C109 is connected in series with a fifth ground terminal GND-S, the diode D15 is connected in series with a sixth ground terminal GND-S, the resistor R373 is connected in series with resistor R309 and resistor R374, the resistor R309 and resistor R374 are connected in parallel and are electrically connected to the bus respectively, and the diode D15 and diode D21 are respectively supplied with 3.3V voltage.

[0039] Specifically, when connected to the mains or generator, the current is limited by the PTC resistor; due to the presence of the diode, the current signal flowing into the rectifier bridge is only half of the voltage provided by the input port; this half-cycle AC current signal flows out of the rectifier bridge as a DC current, which can well protect the device from damage. This module can well avoid the problem that the high-voltage pre-charging circuit in the current battery pack and lithium battery field can only use traditional flyback power supplies or resistive power supplies, and the flyback power supply is not stable during use and has a high cost; the resistive power supply pre-charging circuit has a large resistor heat generation, which not only wastes energy, but also generates a large current that causes damage to the back-end devices.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A novel DC high voltage pre-charging circuit, characterized in that: It includes a current suppression module, a rectifier module, a switch module, a chip control module, a voltage sampling module, and a bus. The current suppression module and the rectifier module are electrically connected, the rectifier module and the switch module are electrically connected, the voltage sampling module and the chip control module are electrically connected, the chip control module and the switch module are electrically connected, the switch module and the rectifier module are electrically connected to the bus respectively, and the voltage sampling module is electrically connected to the bus.

2. A novel DC high voltage pre-charging circuit according to claim 1, characterized in that, The current suppression module includes a GRID port, a GEN port, a PTC resistor R5, a PTC resistor R168, a PTC resistor R433, a PTC resistor R169, a diode D40, a PTC resistor R171, a PTC resistor R134, a PTC resistor R435, a PTC resistor R160 and a diode D22. The PTC resistor R5 and the PTC resistor R168 are connected in parallel and in series with the GRID port. The PTC resistor R433 and the PTC resistor R169 are connected in parallel and in series with the diode D40 and the GRID port. The PTC resistor R171 and the PTC resistor R134 are connected in parallel and in series with the GEN port. The PTC resistor R435 and the PTC resistor R160 are connected in parallel and in series with the diode D22 and the GEN port.

3. A novel DC high voltage pre-charging circuit according to claim 2, characterized in that, The rectifier module includes a rectifier D81 and a rectifier D82, wherein interface 1 of the rectifier D81 is connected in series with PTC resistor R5 and PTC resistor R168, interface 2 of the rectifier D81 is connected in series with PTC resistor R433, PTC resistor R169, and diode D40, interface 1 of the rectifier D82 is connected in series with PTC resistor R171 and PTC resistor R134, interface 2 of the rectifier D82 is connected in series with PTC resistor R435, PTC resistor R160, and diode D22, interface 3 of the rectifier D81 is connected in parallel with interface 3 of the rectifier D82 and in series with the bus, and interface 4 of the rectifier D81 is connected in parallel with interface 4 of the rectifier D82.

4. A novel DC high voltage pre-charging circuit according to claim 3, characterized in that, The switch module includes relay RY22 and relay RY23. The wires between interface 1 of relay RY22, interface 1 of relay RY23 and interface 4 of rectifier D81 and interface 4 of rectifier D82 are electrically connected. Interface 6 of relay RY22 and interface 6 of relay RY23 are connected in series. Interface 5 of relay RY22 and interface 5 of relay RY23 are connected in series. Interface 4 of relay RY22 and interface 4 of relay RY23 are connected in parallel and in series with the bus.

5. A novel DC high voltage pre-charging circuit according to claim 4, characterized in that, A capacitor C71 is connected between the interface 3 of the rectifier D81, the conductor connecting the interface 3 of the rectifier D82 to the bus, and the interface 4 of the relay RY22, the conductor connecting the interface 4 of the relay RY23 to the bus.

6. A novel DC high voltage pre-charging circuit according to claim 5, characterized in that, The chip control module is composed of a DSP chip and peripheral circuits.

7. A novel DC high voltage pre-charging circuit according to claim 6, characterized in that, The voltage sampling module includes an integrated chip U5, a chip U4, a diode D21, a diode D15, a resistor R17, a resistor R18, a resistor R24, a resistor R25, a resistor R359, a resistor R373, a resistor R361, a resistor R372, a resistor R374, a resistor R309, a capacitor C24, a capacitor C29, a capacitor C112, and a capacitor C109. The resistor R17 is connected in series with the interface 12 and the bus of the chip U5, and the resistor R17 is connected in series with the resistor R18 and the capacitor C2 4 in parallel, the resistor R18 and the capacitor C24 are connected in parallel and are connected in series with the first ground terminal GND-S, the interface 13 and the interface 14 of the chip U5 are electrically connected, and the interface 14 of the chip U5 is connected in series with the resistor R359, the resistor R359 and the diode D21 are connected in series, the resistor R359 and the capacitor C112 are connected in series, the capacitor C112 is connected in series with the second ground terminal GND-S, the diode D21 is connected in series with the third ground terminal GND-S, the resistor R359 and the resistor R3 61, the resistor R372 is connected in series, the resistor R361 and the resistor R372 are connected in parallel, and are electrically connected to the bus respectively; the resistor R24 ​​is connected in series with the interface 3 of the chip U4 and the bus, and the resistor R17 is connected in parallel with the resistor R25 and the capacitor C29, the resistor R25 and the capacitor C29 are connected in parallel, and are connected in series with the fourth ground terminal GND-S, the interface 2 of the chip U5 is electrically connected to the interface 1, the interface 4 of the chip U4 and the interface 11 are supplied with a 12V voltage, and the interface 1 of the chip U4 is connected to The resistor R373 is connected in series, the resistor R373 and the diode D15 are connected in series, the resistor R373 is also connected in series with the capacitor C109, the capacitor C109 is connected in series with the fifth ground terminal GND-S, the diode D15 is connected in series with the sixth ground terminal GND-S, the resistor R373 and the resistor R309 and the resistor R374 are connected in series, the resistor R309 and the resistor R374 are connected in parallel and are electrically connected to the bus respectively, and the diode D15 and the diode D21 are respectively supplied with a 3.3V voltage.

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