A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.

A high PAR maintenance rate type high pressure sodium lamp with an auxiliary starting switch is provided with an external glass tube and a discharge tube which is arranged at the center in the external glass tube and coaxial with the external glass tube. The surface of the discharge tube is provided with a metal lead. The left and right ends of an external glass shell are provided with pressure sealing plates which are fused and sealed through high temperature. The pressure sealing plates are internally provided with conductive sheets. One end of the discharge tube is connected with the conductive sheet of the left end through a left internal conductive support, and the other end is connected with the conductive sheet of the right end through an auxiliary starting switch component. According to the high pressure sodium lamp, the high pressure sodium lamp can be quickly lit up through a temperature controlled switch so that the high pressure sodium lamp has the advantages of being great in starting performance, great in lighting effect, high in stability, long in the service life, great in high temperature resistance and high pressure resistance and safe and reliable and is not liable to crack.

A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.

A high PAR maintenance rate type high pressure sodium lamp with an auxiliary starting switch is provided with an external glass tube and a discharge tube which is arranged at the center in the external glass tube and coaxial with the external glass tube. The surface of the discharge tube is provided with a metal lead. The left and right ends of an external glass shell are provided with pressure sealing plates which are fused and sealed through high temperature. The pressure sealing plates are internally provided with conductive sheets. One end of the discharge tube is connected with the conductive sheet of the left end through a left internal conductive support, and the other end is connected with the conductive sheet of the right end through an auxiliary starting switch component. According to the high pressure sodium lamp, the high pressure sodium lamp can be quickly lit up through a temperature controlled switch so that the high pressure sodium lamp has the advantages of being great in starting performance, great in lighting effect, high in stability, long in the service life, great in high temperature resistance and high pressure resistance and safe and reliable and is not liable to crack.