Anti-reverse-connection protection circuit and method for improving safety and direct-current power grid system
A protection circuit and anti-reverse connection technology, which is applied in the field of electronic power, can solve problems such as burnout of converter components, and achieve the effect of improving safety
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[0051] Example 1
[0052] This embodiment provides an anti-reverse connection protection circuit that improves security.
[0053] figure 1 is a structural diagram of an anti-reverse connection protection circuit according to an embodiment of the present invention, such as figure 1 shown, the circuit includes:
[0054] 1. Connect the DC bus capacitor C1 and the DC bus output side respectively to detect the voltage value of the DC bus capacitor C1 and the voltage value of the DC bus output side;
[0055] Control unit 2, the input end is connected to the sampling unit 1, and the output end is connected to a switching device, for controlling the switching device to be turned on or off according to the voltage value of the DC bus capacitor C1 and the voltage value of the output side of the DC bus;
[0056] The switching device 3 is disposed between the converter 4 and the positive pole of the output side of the DC bus, and is used to control the conduction or disconnection of the ...
Example Embodiment
[0074] Example 2
[0075] This embodiment provides a DC power grid system, including the above-mentioned anti-reverse connection protection circuit, which can control the circuit on the output side of the DC bus to be disconnected in time when the DC bus is reversely connected, thereby improving the overall safety of the system.
Example Embodiment
[0076] Example 3
[0077] This embodiment provides an anti-reverse connection protection method for improving security.
[0078] Figure 5 It is a flowchart of the anti-reverse connection protection method according to the embodiment of the present invention, such as figure 1 As shown, the method includes:
[0079] S101, detecting the voltage value of the DC bus capacitor and the voltage value of the output side of the DC bus;
[0080] In this embodiment, the specific implementation of detecting the DC bus capacitor voltage value and the DC bus output side voltage value includes:
[0081] Detect the DC bus capacitor voltage value and the DC bus output side voltage value through the sampling unit respectively;
[0082] Wherein, the sampling unit is respectively connected to the DC bus capacitor and the DC bus output side.
[0083] Specifically, the sampling unit includes a first subunit connected in parallel to both ends of the DC bus capacitor and a second subunit connect...
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