Self-excitation push-pull type converter
A self-excited push-pull and converter technology, which is applied in the direction of conversion equipment, instruments, DC power input to DC power output, etc. with intermediate conversion to AC. Transistors TR1 and TR2 have problems such as high heat generation, and achieve good self-protection ability, easy debugging, and good consistency of short-circuit protection performance.
Active Publication Date: 2014-01-01
MORNSUN GUANGZHOU SCI & TECH
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Problems solved by technology
[0016] 2. Once there is a short circuit at the output, the circuit stops vibrating, and the two push-pull transistors are in the off state; after the output overcurrent and the short circuit disappear, the circuit cannot return to the normal working state by itself
[0018] 3. image 3 , Figure 4 , Figure 5 In the existing Jensen circuit, when the output is over-current or short-circuited, the transistors TR1 and TR2 generate a lot of heat and are easily burned
[0027] This is only a 5V to 5V DC / DC converter with a power of 1W. In practical applications, most circuits work at higher voltages and higher powers. At this time, the existing Jensen circuit, after the output When current flow or short circuit occurs, the transistors TR1 and TR2 generate a lot of heat and are easily burned
[0028] 4. The existing circuits for solving the above-mentioned points 1, 2, and 3 are too complicated
Method used
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Embodiment 3
[0098] The working principle of embodiment three is:
[0099] In normal operation, the capacitive reactance of the capacitor Cb is relatively large, and the resistor Rm plays a major role, and the circuit still works in the self-excited push-pull mode controlled by the magnetic saturation transformer T2.
[0100] When the output is short-circuited, as in the first embodiment, due to the effect of the two-terminal network 1, the circuit enters the high-frequency self-excited oscillation mode. At this time, the main transformer T 1 Also because the transmission efficiency is lower, the loss caused by the short circuit of the secondary side is converted to the main transformer T 1 The primary side is not large, so that the circuit does not vibrate, and the operating current of the circuit can be controlled in a lower range, which can also achieve the purpose of the present invention.
[0101] In the third embodiment, a capacitor or Figure 11-2 , Figure 11-3 , Figure 11-4 ,...
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A self-excited push-pull converter, comprising a Jensen circuit, characterized in that a two-terminal network with an electrical property of passing high frequencies and blocking low frequencies exists between a terminal of a magnetic saturation transformer primary winding and a terminal of a main transformer primary winding in said Jensen circuit, i.e. said magnetic saturation transformer primary winding is connected in parallel with said main transformer primary winding through said two-terminal network. The self-excited push-pull converter of the present invention has a good self-protection capability and can be restored by itself to normal operation after overcurrent and short circuit disappear.
Description
technical field [0001] The invention relates to a self-excited push-pull converter, in particular to a self-excited push-pull converter used in industrial control and lighting industries. Background technique [0002] The existing self-excited push-pull converter, the circuit structure part comes from the self-excited oscillating push-pull transistor single-transformer DC converter invented by G.H.Royer in the United States in 1955, usually referred to as the Royer circuit, which also realizes high-frequency conversion. The beginning of the control circuit; in 1957, Jen Sen in the United States (Jen Sen, translated as "Jing Sen" in some places) invented the self-excited push-pull double transformer circuit, which was later called the self-oscillating Jensen circuit and the self-excited push-pull Jensen circuit. It is also known as Jingsen circuit; these two circuits are called self-excited push-pull converters by later generations. [0003] The self-excited push-pull conver...
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IPC IPC(8): H02M3/337H02M1/32
CPCH02M3/3382H02M3/33538H02M1/32H02M3/337Y02B70/10
Inventor王保均
OwnerMORNSUN GUANGZHOU SCI & TECH